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Arjan van de Venf71d20e2006-06-28 04:26:45 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 Copyright (C) 2002 Richard Henderson
Rusty Russell51f3d0f2010-08-05 12:59:13 -06003 Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18*/
Paul Gortmaker9984de12011-05-23 14:51:41 -040019#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/moduleloader.h>
Steven Rostedt6d723732009-04-10 14:53:50 -040021#include <linux/ftrace_event.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/init.h>
Alexey Dobriyanae84e322007-05-08 00:28:38 -070023#include <linux/kallsyms.h>
Kees Cook34e11692012-10-16 07:31:07 +103024#include <linux/file.h>
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +040025#include <linux/fs.h>
Roland McGrath6d760132007-10-16 23:26:40 -070026#include <linux/sysfs.h>
Randy Dunlap9f158332005-09-13 01:25:16 -070027#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/slab.h>
29#include <linux/vmalloc.h>
30#include <linux/elf.h>
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +040031#include <linux/proc_fs.h>
Kees Cook2e72d512012-10-16 07:32:07 +103032#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/seq_file.h>
34#include <linux/syscalls.h>
35#include <linux/fcntl.h>
36#include <linux/rcupdate.h>
Randy.Dunlapc59ede72006-01-11 12:17:46 -080037#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/cpu.h>
39#include <linux/moduleparam.h>
40#include <linux/errno.h>
41#include <linux/err.h>
42#include <linux/vermagic.h>
43#include <linux/notifier.h>
Al Virof6a57032006-10-18 01:47:25 -040044#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/device.h>
Matt Domschc988d2b2005-06-23 22:05:15 -070046#include <linux/string.h>
Arjan van de Ven97d1f152006-03-23 03:00:24 -080047#include <linux/mutex.h>
Andi Kleend72b3752008-08-30 10:09:00 +020048#include <linux/rculist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <asm/cacheflush.h>
Bernd Schmidteb8cdec2009-09-21 17:03:57 -070051#include <asm/mmu_context.h>
Sam Ravnborgb817f6f2006-06-09 21:53:55 +020052#include <linux/license.h>
Christoph Lameter6d762392008-02-08 04:18:42 -080053#include <asm/sections.h>
Mathieu Desnoyers97e1c182008-07-18 12:16:16 -040054#include <linux/tracepoint.h>
Steven Rostedt90d595f2008-08-14 15:45:09 -040055#include <linux/ftrace.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080056#include <linux/async.h>
Tejun Heofbf59bc2009-02-20 16:29:08 +090057#include <linux/percpu.h>
Catalin Marinas4f2294b2009-06-11 13:23:20 +010058#include <linux/kmemleak.h>
Andrey Ryabininbebf56a2015-02-13 14:40:17 -080059#include <linux/kasan.h>
Jason Baronbf5438fc2010-09-17 11:09:00 -040060#include <linux/jump_label.h>
matthieu castet84e1c6b2010-11-16 22:35:16 +010061#include <linux/pfn.h>
Alessio Igor Bogani403ed272011-04-20 11:10:52 +020062#include <linux/bsearch.h>
Rusty Russell2f3238a2012-10-22 18:09:41 +103063#include <uapi/linux/module.h>
Rusty Russell106a4ee2012-09-26 10:09:40 +010064#include "module-internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
Li Zefan7ead8b82009-08-17 16:56:28 +080066#define CREATE_TRACE_POINTS
67#include <trace/events/module.h>
68
Linus Torvalds1da177e2005-04-16 15:20:36 -070069#ifndef ARCH_SHF_SMALL
70#define ARCH_SHF_SMALL 0
71#endif
72
matthieu castet84e1c6b2010-11-16 22:35:16 +010073/*
74 * Modules' sections will be aligned on page boundaries
75 * to ensure complete separation of code and data, but
76 * only when CONFIG_DEBUG_SET_MODULE_RONX=y
77 */
78#ifdef CONFIG_DEBUG_SET_MODULE_RONX
79# define debug_align(X) ALIGN(X, PAGE_SIZE)
80#else
81# define debug_align(X) (X)
82#endif
83
84/*
85 * Given BASE and SIZE this macro calculates the number of pages the
86 * memory regions occupies
87 */
88#define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \
89 (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \
90 PFN_DOWN((unsigned long)BASE) + 1) \
91 : (0UL))
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093/* If this is set, the section belongs in the init part of the module */
94#define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
95
Rusty Russell75676502010-06-05 11:17:36 -060096/*
97 * Mutex protects:
98 * 1) List of modules (also safely readable with preempt_disable),
99 * 2) module_use links,
100 * 3) module_addr_min/module_addr_max.
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030101 * (delete and add uses RCU list operations). */
Tim Abbottc6b37802008-12-05 19:03:59 -0500102DEFINE_MUTEX(module_mutex);
103EXPORT_SYMBOL_GPL(module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104static LIST_HEAD(modules);
Jason Wessel67fc4e02010-05-20 21:04:21 -0500105#ifdef CONFIG_KGDB_KDB
106struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */
107#endif /* CONFIG_KGDB_KDB */
108
Rusty Russell106a4ee2012-09-26 10:09:40 +0100109#ifdef CONFIG_MODULE_SIG
110#ifdef CONFIG_MODULE_SIG_FORCE
111static bool sig_enforce = true;
112#else
113static bool sig_enforce = false;
114
115static int param_set_bool_enable_only(const char *val,
116 const struct kernel_param *kp)
117{
118 int err;
119 bool test;
120 struct kernel_param dummy_kp = *kp;
121
122 dummy_kp.arg = &test;
123
124 err = param_set_bool(val, &dummy_kp);
125 if (err)
126 return err;
127
128 /* Don't let them unset it once it's set! */
129 if (!test && sig_enforce)
130 return -EROFS;
131
132 if (test)
133 sig_enforce = true;
134 return 0;
135}
136
137static const struct kernel_param_ops param_ops_bool_enable_only = {
Jani Nikula6a4c2642014-08-27 06:21:23 +0930138 .flags = KERNEL_PARAM_OPS_FL_NOARG,
Rusty Russell106a4ee2012-09-26 10:09:40 +0100139 .set = param_set_bool_enable_only,
140 .get = param_get_bool,
141};
142#define param_check_bool_enable_only param_check_bool
143
144module_param(sig_enforce, bool_enable_only, 0644);
145#endif /* !CONFIG_MODULE_SIG_FORCE */
146#endif /* CONFIG_MODULE_SIG */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Stephen Rothwell19e45292009-04-14 17:27:18 +1000148/* Block module loading/unloading? */
149int modules_disabled = 0;
Dave Young02608be2012-02-01 10:33:14 +0800150core_param(nomodule, modules_disabled, bint, 0);
Stephen Rothwell19e45292009-04-14 17:27:18 +1000151
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500152/* Waiting for a module to finish initializing? */
153static DECLARE_WAIT_QUEUE_HEAD(module_wq);
154
Alan Sterne041c682006-03-27 01:16:30 -0800155static BLOCKING_NOTIFIER_HEAD(module_notify_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156
Rusty Russell75676502010-06-05 11:17:36 -0600157/* Bounds of module allocation, for speeding __module_address.
158 * Protected by module_mutex. */
Rusty Russell3a642e92008-07-22 19:24:28 -0500159static unsigned long module_addr_min = -1UL, module_addr_max = 0;
160
Ionut Alexa6da0b562014-11-10 09:31:29 +1030161int register_module_notifier(struct notifier_block *nb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
Alan Sterne041c682006-03-27 01:16:30 -0800163 return blocking_notifier_chain_register(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165EXPORT_SYMBOL(register_module_notifier);
166
Ionut Alexa6da0b562014-11-10 09:31:29 +1030167int unregister_module_notifier(struct notifier_block *nb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
Alan Sterne041c682006-03-27 01:16:30 -0800169 return blocking_notifier_chain_unregister(&module_notify_list, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171EXPORT_SYMBOL(unregister_module_notifier);
172
Rusty Russelleded41c2010-08-05 12:59:07 -0600173struct load_info {
174 Elf_Ehdr *hdr;
175 unsigned long len;
176 Elf_Shdr *sechdrs;
Rusty Russell6526c532010-08-05 12:59:10 -0600177 char *secstrings, *strtab;
Rusty Russelld9131882010-08-05 12:59:08 -0600178 unsigned long symoffs, stroffs;
Rusty Russell811d66a2010-08-05 12:59:12 -0600179 struct _ddebug *debug;
180 unsigned int num_debug;
Rusty Russell106a4ee2012-09-26 10:09:40 +0100181 bool sig_ok;
Rusty Russelleded41c2010-08-05 12:59:07 -0600182 struct {
183 unsigned int sym, str, mod, vers, info, pcpu;
184 } index;
185};
186
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -0800187/* We require a truly strong try_module_get(): 0 means failure due to
188 ongoing or failed initialization etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189static inline int strong_try_module_get(struct module *mod)
190{
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030191 BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (mod && mod->state == MODULE_STATE_COMING)
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500193 return -EBUSY;
194 if (try_module_get(mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 return 0;
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500196 else
197 return -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
Rusty Russell373d4d02013-01-21 17:17:39 +1030200static inline void add_taint_module(struct module *mod, unsigned flag,
201 enum lockdep_ok lockdep_ok)
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700202{
Rusty Russell373d4d02013-01-21 17:17:39 +1030203 add_taint(flag, lockdep_ok);
Andi Kleen25ddbb12008-10-15 22:01:41 -0700204 mod->taints |= (1U << flag);
Florin Malitafa3ba2e82006-10-11 01:21:48 -0700205}
206
Robert P. J. Day02a3e592007-05-09 07:26:28 +0200207/*
208 * A thread that wants to hold a reference to a module only while it
209 * is running can call this to safely exit. nfsd and lockd use this.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 */
211void __module_put_and_exit(struct module *mod, long code)
212{
213 module_put(mod);
214 do_exit(code);
215}
216EXPORT_SYMBOL(__module_put_and_exit);
Daniel Walker22a8bde2007-10-18 03:06:07 -0700217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218/* Find a module section: 0 means not found. */
Rusty Russell49668682010-08-05 12:59:10 -0600219static unsigned int find_sec(const struct load_info *info, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
221 unsigned int i;
222
Rusty Russell49668682010-08-05 12:59:10 -0600223 for (i = 1; i < info->hdr->e_shnum; i++) {
224 Elf_Shdr *shdr = &info->sechdrs[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 /* Alloc bit cleared means "ignore it." */
Rusty Russell49668682010-08-05 12:59:10 -0600226 if ((shdr->sh_flags & SHF_ALLOC)
227 && strcmp(info->secstrings + shdr->sh_name, name) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return i;
Rusty Russell49668682010-08-05 12:59:10 -0600229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return 0;
231}
232
Rusty Russell5e458cc2008-10-22 10:00:13 -0500233/* Find a module section, or NULL. */
Rusty Russell49668682010-08-05 12:59:10 -0600234static void *section_addr(const struct load_info *info, const char *name)
Rusty Russell5e458cc2008-10-22 10:00:13 -0500235{
236 /* Section 0 has sh_addr 0. */
Rusty Russell49668682010-08-05 12:59:10 -0600237 return (void *)info->sechdrs[find_sec(info, name)].sh_addr;
Rusty Russell5e458cc2008-10-22 10:00:13 -0500238}
239
240/* Find a module section, or NULL. Fill in number of "objects" in section. */
Rusty Russell49668682010-08-05 12:59:10 -0600241static void *section_objs(const struct load_info *info,
Rusty Russell5e458cc2008-10-22 10:00:13 -0500242 const char *name,
243 size_t object_size,
244 unsigned int *num)
245{
Rusty Russell49668682010-08-05 12:59:10 -0600246 unsigned int sec = find_sec(info, name);
Rusty Russell5e458cc2008-10-22 10:00:13 -0500247
248 /* Section 0 has sh_addr 0 and sh_size 0. */
Rusty Russell49668682010-08-05 12:59:10 -0600249 *num = info->sechdrs[sec].sh_size / object_size;
250 return (void *)info->sechdrs[sec].sh_addr;
Rusty Russell5e458cc2008-10-22 10:00:13 -0500251}
252
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253/* Provided by the linker */
254extern const struct kernel_symbol __start___ksymtab[];
255extern const struct kernel_symbol __stop___ksymtab[];
256extern const struct kernel_symbol __start___ksymtab_gpl[];
257extern const struct kernel_symbol __stop___ksymtab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800258extern const struct kernel_symbol __start___ksymtab_gpl_future[];
259extern const struct kernel_symbol __stop___ksymtab_gpl_future[];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260extern const unsigned long __start___kcrctab[];
261extern const unsigned long __start___kcrctab_gpl[];
Greg Kroah-Hartman9f28bb72006-03-20 13:17:13 -0800262extern const unsigned long __start___kcrctab_gpl_future[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500263#ifdef CONFIG_UNUSED_SYMBOLS
264extern const struct kernel_symbol __start___ksymtab_unused[];
265extern const struct kernel_symbol __stop___ksymtab_unused[];
266extern const struct kernel_symbol __start___ksymtab_unused_gpl[];
267extern const struct kernel_symbol __stop___ksymtab_unused_gpl[];
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700268extern const unsigned long __start___kcrctab_unused[];
269extern const unsigned long __start___kcrctab_unused_gpl[];
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500270#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272#ifndef CONFIG_MODVERSIONS
273#define symversion(base, idx) NULL
274#else
Andrew Mortonf83ca9f2006-03-28 01:56:20 -0800275#define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276#endif
277
Rusty Russelldafd0942008-07-22 19:24:25 -0500278static bool each_symbol_in_section(const struct symsearch *arr,
279 unsigned int arrsize,
280 struct module *owner,
281 bool (*fn)(const struct symsearch *syms,
282 struct module *owner,
Rusty Russellde4d8d52011-04-19 21:49:58 +0200283 void *data),
Rusty Russelldafd0942008-07-22 19:24:25 -0500284 void *data)
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100285{
Rusty Russellde4d8d52011-04-19 21:49:58 +0200286 unsigned int j;
Rusty Russelldafd0942008-07-22 19:24:25 -0500287
288 for (j = 0; j < arrsize; j++) {
Rusty Russellde4d8d52011-04-19 21:49:58 +0200289 if (fn(&arr[j], owner, data))
290 return true;
Rusty Russelldafd0942008-07-22 19:24:25 -0500291 }
292
293 return false;
Sam Ravnborg3fd68052006-02-08 21:16:45 +0100294}
295
Rusty Russelldafd0942008-07-22 19:24:25 -0500296/* Returns true as soon as fn returns true, otherwise false. */
Rusty Russellde4d8d52011-04-19 21:49:58 +0200297bool each_symbol_section(bool (*fn)(const struct symsearch *arr,
298 struct module *owner,
299 void *data),
300 void *data)
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700301{
Rusty Russelldafd0942008-07-22 19:24:25 -0500302 struct module *mod;
Linus Torvalds44032e62010-08-05 12:59:05 -0600303 static const struct symsearch arr[] = {
Rusty Russelldafd0942008-07-22 19:24:25 -0500304 { __start___ksymtab, __stop___ksymtab, __start___kcrctab,
305 NOT_GPL_ONLY, false },
306 { __start___ksymtab_gpl, __stop___ksymtab_gpl,
307 __start___kcrctab_gpl,
308 GPL_ONLY, false },
309 { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future,
310 __start___kcrctab_gpl_future,
311 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500312#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500313 { __start___ksymtab_unused, __stop___ksymtab_unused,
314 __start___kcrctab_unused,
315 NOT_GPL_ONLY, true },
316 { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl,
317 __start___kcrctab_unused_gpl,
318 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500319#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500320 };
321
322 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data))
323 return true;
324
Andi Kleend72b3752008-08-30 10:09:00 +0200325 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russelldafd0942008-07-22 19:24:25 -0500326 struct symsearch arr[] = {
327 { mod->syms, mod->syms + mod->num_syms, mod->crcs,
328 NOT_GPL_ONLY, false },
329 { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms,
330 mod->gpl_crcs,
331 GPL_ONLY, false },
332 { mod->gpl_future_syms,
333 mod->gpl_future_syms + mod->num_gpl_future_syms,
334 mod->gpl_future_crcs,
335 WILL_BE_GPL_ONLY, false },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500336#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500337 { mod->unused_syms,
338 mod->unused_syms + mod->num_unused_syms,
339 mod->unused_crcs,
340 NOT_GPL_ONLY, true },
341 { mod->unused_gpl_syms,
342 mod->unused_gpl_syms + mod->num_unused_gpl_syms,
343 mod->unused_gpl_crcs,
344 GPL_ONLY, true },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500345#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500346 };
347
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030348 if (mod->state == MODULE_STATE_UNFORMED)
349 continue;
350
Rusty Russelldafd0942008-07-22 19:24:25 -0500351 if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data))
352 return true;
353 }
354 return false;
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700355}
Rusty Russellde4d8d52011-04-19 21:49:58 +0200356EXPORT_SYMBOL_GPL(each_symbol_section);
Arjan van de Venf71d20e2006-06-28 04:26:45 -0700357
Rusty Russelldafd0942008-07-22 19:24:25 -0500358struct find_symbol_arg {
359 /* Input */
360 const char *name;
361 bool gplok;
362 bool warn;
363
364 /* Output */
365 struct module *owner;
366 const unsigned long *crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500367 const struct kernel_symbol *sym;
Rusty Russelldafd0942008-07-22 19:24:25 -0500368};
369
Rusty Russellde4d8d52011-04-19 21:49:58 +0200370static bool check_symbol(const struct symsearch *syms,
371 struct module *owner,
372 unsigned int symnum, void *data)
Rusty Russellad9546c2008-05-01 21:14:59 -0500373{
Rusty Russelldafd0942008-07-22 19:24:25 -0500374 struct find_symbol_arg *fsa = data;
375
Rusty Russelldafd0942008-07-22 19:24:25 -0500376 if (!fsa->gplok) {
377 if (syms->licence == GPL_ONLY)
378 return false;
379 if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800380 pr_warn("Symbol %s is being used by a non-GPL module, "
381 "which will not be allowed in the future\n",
382 fsa->name);
Rusty Russelldafd0942008-07-22 19:24:25 -0500383 }
384 }
385
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500386#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russelldafd0942008-07-22 19:24:25 -0500387 if (syms->unused && fsa->warn) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800388 pr_warn("Symbol %s is marked as UNUSED, however this module is "
389 "using it.\n", fsa->name);
390 pr_warn("This symbol will go away in the future.\n");
391 pr_warn("Please evalute if this is the right api to use and if "
392 "it really is, submit a report the linux kernel "
393 "mailinglist together with submitting your code for "
394 "inclusion.\n");
Rusty Russellad9546c2008-05-01 21:14:59 -0500395 }
Denys Vlasenkof7f5b672008-07-22 19:24:26 -0500396#endif
Rusty Russelldafd0942008-07-22 19:24:25 -0500397
398 fsa->owner = owner;
399 fsa->crc = symversion(syms->crcs, symnum);
Tim Abbott414fd312008-12-05 19:03:56 -0500400 fsa->sym = &syms->start[symnum];
Rusty Russellad9546c2008-05-01 21:14:59 -0500401 return true;
402}
403
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200404static int cmp_name(const void *va, const void *vb)
405{
406 const char *a;
407 const struct kernel_symbol *b;
408 a = va; b = vb;
409 return strcmp(a, b->name);
410}
411
Rusty Russellde4d8d52011-04-19 21:49:58 +0200412static bool find_symbol_in_section(const struct symsearch *syms,
413 struct module *owner,
414 void *data)
415{
416 struct find_symbol_arg *fsa = data;
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200417 struct kernel_symbol *sym;
Rusty Russellde4d8d52011-04-19 21:49:58 +0200418
Alessio Igor Bogani403ed272011-04-20 11:10:52 +0200419 sym = bsearch(fsa->name, syms->start, syms->stop - syms->start,
420 sizeof(struct kernel_symbol), cmp_name);
421
422 if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data))
423 return true;
424
Rusty Russellde4d8d52011-04-19 21:49:58 +0200425 return false;
426}
427
Tim Abbott414fd312008-12-05 19:03:56 -0500428/* Find a symbol and return it, along with, (optional) crc and
Rusty Russell75676502010-06-05 11:17:36 -0600429 * (optional) module which owns it. Needs preempt disabled or module_mutex. */
Tim Abbottc6b37802008-12-05 19:03:59 -0500430const struct kernel_symbol *find_symbol(const char *name,
431 struct module **owner,
432 const unsigned long **crc,
433 bool gplok,
434 bool warn)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435{
Rusty Russelldafd0942008-07-22 19:24:25 -0500436 struct find_symbol_arg fsa;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Rusty Russelldafd0942008-07-22 19:24:25 -0500438 fsa.name = name;
439 fsa.gplok = gplok;
440 fsa.warn = warn;
441
Rusty Russellde4d8d52011-04-19 21:49:58 +0200442 if (each_symbol_section(find_symbol_in_section, &fsa)) {
Rusty Russellad9546c2008-05-01 21:14:59 -0500443 if (owner)
Rusty Russelldafd0942008-07-22 19:24:25 -0500444 *owner = fsa.owner;
445 if (crc)
446 *crc = fsa.crc;
Tim Abbott414fd312008-12-05 19:03:56 -0500447 return fsa.sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 }
Rusty Russellad9546c2008-05-01 21:14:59 -0500449
Jim Cromie5e124162011-12-06 12:11:31 -0700450 pr_debug("Failed to find symbol %s\n", name);
Tim Abbott414fd312008-12-05 19:03:56 -0500451 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
Tim Abbottc6b37802008-12-05 19:03:59 -0500453EXPORT_SYMBOL_GPL(find_symbol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455/* Search for module by name: must hold module_mutex. */
Mathias Krause4f6de4d2013-07-02 15:35:11 +0930456static struct module *find_module_all(const char *name, size_t len,
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030457 bool even_unformed)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458{
459 struct module *mod;
460
461 list_for_each_entry(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030462 if (!even_unformed && mod->state == MODULE_STATE_UNFORMED)
463 continue;
Mathias Krause4f6de4d2013-07-02 15:35:11 +0930464 if (strlen(mod->name) == len && !memcmp(mod->name, name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 return mod;
466 }
467 return NULL;
468}
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030469
470struct module *find_module(const char *name)
471{
Mathias Krause4f6de4d2013-07-02 15:35:11 +0930472 return find_module_all(name, strlen(name), false);
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030473}
Tim Abbottc6b37802008-12-05 19:03:59 -0500474EXPORT_SYMBOL_GPL(find_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476#ifdef CONFIG_SMP
Tejun Heofbf59bc2009-02-20 16:29:08 +0900477
Tejun Heo259354d2010-03-10 18:56:10 +0900478static inline void __percpu *mod_percpu(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900479{
Tejun Heo259354d2010-03-10 18:56:10 +0900480 return mod->percpu;
481}
Tejun Heofbf59bc2009-02-20 16:29:08 +0900482
Rusty Russell9eb76d72013-07-03 10:06:29 +0930483static int percpu_modalloc(struct module *mod, struct load_info *info)
Tejun Heo259354d2010-03-10 18:56:10 +0900484{
Rusty Russell9eb76d72013-07-03 10:06:29 +0930485 Elf_Shdr *pcpusec = &info->sechdrs[info->index.pcpu];
486 unsigned long align = pcpusec->sh_addralign;
487
488 if (!pcpusec->sh_size)
489 return 0;
490
Tejun Heofbf59bc2009-02-20 16:29:08 +0900491 if (align > PAGE_SIZE) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800492 pr_warn("%s: per-cpu alignment %li > %li\n",
493 mod->name, align, PAGE_SIZE);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900494 align = PAGE_SIZE;
495 }
496
Rusty Russell9eb76d72013-07-03 10:06:29 +0930497 mod->percpu = __alloc_reserved_percpu(pcpusec->sh_size, align);
Tejun Heo259354d2010-03-10 18:56:10 +0900498 if (!mod->percpu) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800499 pr_warn("%s: Could not allocate %lu bytes percpu data\n",
500 mod->name, (unsigned long)pcpusec->sh_size);
Tejun Heo259354d2010-03-10 18:56:10 +0900501 return -ENOMEM;
502 }
Rusty Russell9eb76d72013-07-03 10:06:29 +0930503 mod->percpu_size = pcpusec->sh_size;
Tejun Heo259354d2010-03-10 18:56:10 +0900504 return 0;
Tejun Heofbf59bc2009-02-20 16:29:08 +0900505}
506
Tejun Heo259354d2010-03-10 18:56:10 +0900507static void percpu_modfree(struct module *mod)
Tejun Heofbf59bc2009-02-20 16:29:08 +0900508{
Tejun Heo259354d2010-03-10 18:56:10 +0900509 free_percpu(mod->percpu);
Tejun Heofbf59bc2009-02-20 16:29:08 +0900510}
511
Rusty Russell49668682010-08-05 12:59:10 -0600512static unsigned int find_pcpusec(struct load_info *info)
Tejun Heo6b588c12009-02-20 16:29:07 +0900513{
Rusty Russell49668682010-08-05 12:59:10 -0600514 return find_sec(info, ".data..percpu");
Tejun Heo6b588c12009-02-20 16:29:07 +0900515}
516
Tejun Heo259354d2010-03-10 18:56:10 +0900517static void percpu_modcopy(struct module *mod,
518 const void *from, unsigned long size)
Tejun Heo6b588c12009-02-20 16:29:07 +0900519{
520 int cpu;
521
522 for_each_possible_cpu(cpu)
Tejun Heo259354d2010-03-10 18:56:10 +0900523 memcpy(per_cpu_ptr(mod->percpu, cpu), from, size);
Tejun Heo6b588c12009-02-20 16:29:07 +0900524}
525
Tejun Heo10fad5e2010-03-10 18:57:54 +0900526/**
527 * is_module_percpu_address - test whether address is from module static percpu
528 * @addr: address to test
529 *
530 * Test whether @addr belongs to module static percpu area.
531 *
532 * RETURNS:
533 * %true if @addr is from module static percpu area
534 */
535bool is_module_percpu_address(unsigned long addr)
536{
537 struct module *mod;
538 unsigned int cpu;
539
540 preempt_disable();
541
542 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +1030543 if (mod->state == MODULE_STATE_UNFORMED)
544 continue;
Tejun Heo10fad5e2010-03-10 18:57:54 +0900545 if (!mod->percpu_size)
546 continue;
547 for_each_possible_cpu(cpu) {
548 void *start = per_cpu_ptr(mod->percpu, cpu);
549
550 if ((void *)addr >= start &&
551 (void *)addr < start + mod->percpu_size) {
552 preempt_enable();
553 return true;
554 }
555 }
556 }
557
558 preempt_enable();
559 return false;
Daniel Walker22a8bde2007-10-18 03:06:07 -0700560}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562#else /* ... !CONFIG_SMP */
Tejun Heo6b588c12009-02-20 16:29:07 +0900563
Tejun Heo259354d2010-03-10 18:56:10 +0900564static inline void __percpu *mod_percpu(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565{
566 return NULL;
567}
Rusty Russell9eb76d72013-07-03 10:06:29 +0930568static int percpu_modalloc(struct module *mod, struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
Rusty Russell9eb76d72013-07-03 10:06:29 +0930570 /* UP modules shouldn't have this section: ENOMEM isn't quite right */
571 if (info->sechdrs[info->index.pcpu].sh_size != 0)
572 return -ENOMEM;
573 return 0;
Tejun Heo259354d2010-03-10 18:56:10 +0900574}
575static inline void percpu_modfree(struct module *mod)
576{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577}
Rusty Russell49668682010-08-05 12:59:10 -0600578static unsigned int find_pcpusec(struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
580 return 0;
581}
Tejun Heo259354d2010-03-10 18:56:10 +0900582static inline void percpu_modcopy(struct module *mod,
583 const void *from, unsigned long size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584{
585 /* pcpusec should be 0, and size of that section should be 0. */
586 BUG_ON(size != 0);
587}
Tejun Heo10fad5e2010-03-10 18:57:54 +0900588bool is_module_percpu_address(unsigned long addr)
589{
590 return false;
591}
Tejun Heo6b588c12009-02-20 16:29:07 +0900592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593#endif /* CONFIG_SMP */
594
Matt Domschc988d2b2005-06-23 22:05:15 -0700595#define MODINFO_ATTR(field) \
596static void setup_modinfo_##field(struct module *mod, const char *s) \
597{ \
598 mod->field = kstrdup(s, GFP_KERNEL); \
599} \
600static ssize_t show_modinfo_##field(struct module_attribute *mattr, \
Kay Sievers4befb022011-07-24 22:06:04 +0930601 struct module_kobject *mk, char *buffer) \
Matt Domschc988d2b2005-06-23 22:05:15 -0700602{ \
Chen Gangcc56ded2013-08-20 15:34:21 +0930603 return scnprintf(buffer, PAGE_SIZE, "%s\n", mk->mod->field); \
Matt Domschc988d2b2005-06-23 22:05:15 -0700604} \
605static int modinfo_##field##_exists(struct module *mod) \
606{ \
607 return mod->field != NULL; \
608} \
609static void free_modinfo_##field(struct module *mod) \
610{ \
Daniel Walker22a8bde2007-10-18 03:06:07 -0700611 kfree(mod->field); \
612 mod->field = NULL; \
Matt Domschc988d2b2005-06-23 22:05:15 -0700613} \
614static struct module_attribute modinfo_##field = { \
Tejun Heo7b595752007-06-14 03:45:17 +0900615 .attr = { .name = __stringify(field), .mode = 0444 }, \
Matt Domschc988d2b2005-06-23 22:05:15 -0700616 .show = show_modinfo_##field, \
617 .setup = setup_modinfo_##field, \
618 .test = modinfo_##field##_exists, \
619 .free = free_modinfo_##field, \
620};
621
622MODINFO_ATTR(version);
623MODINFO_ATTR(srcversion);
624
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100625static char last_unloaded_module[MODULE_NAME_LEN+1];
626
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -0800627#ifdef CONFIG_MODULE_UNLOAD
Steven Rostedteb0c5372010-03-29 14:25:18 -0400628
629EXPORT_TRACEPOINT_SYMBOL(module_get);
630
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030631/* MODULE_REF_BASE is the base reference count by kmodule loader. */
632#define MODULE_REF_BASE 1
633
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634/* Init the unload section of the module. */
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600635static int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636{
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030637 /*
638 * Initialize reference counter to MODULE_REF_BASE.
639 * refcnt == 0 means module is going.
640 */
641 atomic_set(&mod->refcnt, MODULE_REF_BASE);
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600642
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700643 INIT_LIST_HEAD(&mod->source_list);
644 INIT_LIST_HEAD(&mod->target_list);
Christoph Lametere1783a22010-01-05 15:34:50 +0900645
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 /* Hold reference count during initialization. */
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030647 atomic_inc(&mod->refcnt);
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600648
649 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650}
651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652/* Does a already use b? */
653static int already_uses(struct module *a, struct module *b)
654{
655 struct module_use *use;
656
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700657 list_for_each_entry(use, &b->source_list, source_list) {
658 if (use->source == a) {
Jim Cromie5e124162011-12-06 12:11:31 -0700659 pr_debug("%s uses %s!\n", a->name, b->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 return 1;
661 }
662 }
Jim Cromie5e124162011-12-06 12:11:31 -0700663 pr_debug("%s does not use %s!\n", a->name, b->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 return 0;
665}
666
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700667/*
668 * Module a uses b
669 * - we add 'a' as a "source", 'b' as a "target" of module use
670 * - the module_use is added to the list of 'b' sources (so
671 * 'b' can walk the list to see who sourced them), and of 'a'
672 * targets (so 'a' can see what modules it targets).
673 */
674static int add_module_usage(struct module *a, struct module *b)
675{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700676 struct module_use *use;
677
Jim Cromie5e124162011-12-06 12:11:31 -0700678 pr_debug("Allocating new usage for %s.\n", a->name);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700679 use = kmalloc(sizeof(*use), GFP_ATOMIC);
680 if (!use) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -0800681 pr_warn("%s: out of memory loading\n", a->name);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700682 return -ENOMEM;
683 }
684
685 use->source = a;
686 use->target = b;
687 list_add(&use->source_list, &b->source_list);
688 list_add(&use->target_list, &a->target_list);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700689 return 0;
690}
691
Rusty Russell75676502010-06-05 11:17:36 -0600692/* Module a uses b: caller needs module_mutex() */
Rusty Russell9bea7f22010-06-05 11:17:37 -0600693int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
Rusty Russellc8e21ce2010-06-05 11:17:35 -0600695 int err;
Kay Sievers270a6c42007-01-18 13:26:15 +0100696
Rusty Russell9bea7f22010-06-05 11:17:37 -0600697 if (b == NULL || already_uses(a, b))
Linus Torvalds218ce732010-05-25 16:48:30 -0700698 return 0;
Linus Torvalds218ce732010-05-25 16:48:30 -0700699
Rusty Russell9bea7f22010-06-05 11:17:37 -0600700 /* If module isn't available, we fail. */
701 err = strong_try_module_get(b);
Rusty Russellc9a3ba52008-01-29 17:13:18 -0500702 if (err)
Rusty Russell9bea7f22010-06-05 11:17:37 -0600703 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700705 err = add_module_usage(a, b);
706 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 module_put(b);
Rusty Russell9bea7f22010-06-05 11:17:37 -0600708 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 }
Rusty Russell9bea7f22010-06-05 11:17:37 -0600710 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600712EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
714/* Clear the unload stuff of the module. */
715static void module_unload_free(struct module *mod)
716{
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700717 struct module_use *use, *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718
Rusty Russell75676502010-06-05 11:17:36 -0600719 mutex_lock(&module_mutex);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700720 list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) {
721 struct module *i = use->target;
Jim Cromie5e124162011-12-06 12:11:31 -0700722 pr_debug("%s unusing %s\n", mod->name, i->name);
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700723 module_put(i);
724 list_del(&use->source_list);
725 list_del(&use->target_list);
726 kfree(use);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 }
Rusty Russell75676502010-06-05 11:17:36 -0600728 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729}
730
731#ifdef CONFIG_MODULE_FORCE_UNLOAD
Akinobu Mitafb169792006-01-08 01:04:29 -0800732static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733{
734 int ret = (flags & O_TRUNC);
735 if (ret)
Rusty Russell373d4d02013-01-21 17:17:39 +1030736 add_taint(TAINT_FORCED_RMMOD, LOCKDEP_NOW_UNRELIABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 return ret;
738}
739#else
Akinobu Mitafb169792006-01-08 01:04:29 -0800740static inline int try_force_unload(unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741{
742 return 0;
743}
744#endif /* CONFIG_MODULE_FORCE_UNLOAD */
745
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030746/* Try to release refcount of module, 0 means success. */
747static int try_release_module_ref(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748{
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030749 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030751 /* Try to decrement refcnt which we set at loading */
752 ret = atomic_sub_return(MODULE_REF_BASE, &mod->refcnt);
753 BUG_ON(ret < 0);
754 if (ret)
755 /* Someone can put this right now, recover with checking */
756 ret = atomic_add_unless(&mod->refcnt, MODULE_REF_BASE, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030758 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759}
760
761static int try_stop_module(struct module *mod, int flags, int *forced)
762{
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030763 /* If it's not unused, quit unless we're forcing. */
764 if (try_release_module_ref(mod) != 0) {
765 *forced = try_force_unload(flags);
766 if (!(*forced))
767 return -EWOULDBLOCK;
768 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030770 /* Mark it as dying. */
771 mod->state = MODULE_STATE_GOING;
772
773 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
Rusty Russelld5db1392015-01-22 11:13:14 +1030776/**
777 * module_refcount - return the refcount or -1 if unloading
778 *
779 * @mod: the module we're checking
780 *
781 * Returns:
782 * -1 if the module is in the process of unloading
783 * otherwise the number of references in the kernel to the module
784 */
785int module_refcount(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786{
Rusty Russelld5db1392015-01-22 11:13:14 +1030787 return atomic_read(&mod->refcnt) - MODULE_REF_BASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789EXPORT_SYMBOL(module_refcount);
790
791/* This exists whether we can unload or not */
792static void free_module(struct module *mod);
793
Heiko Carstens17da2bd2009-01-14 14:14:10 +0100794SYSCALL_DEFINE2(delete_module, const char __user *, name_user,
795 unsigned int, flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796{
797 struct module *mod;
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800798 char name[MODULE_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 int ret, forced = 0;
800
Kees Cook3d433212009-04-02 15:49:29 -0700801 if (!capable(CAP_SYS_MODULE) || modules_disabled)
Greg Kroah-Hartmandfff0a02007-02-23 14:54:57 -0800802 return -EPERM;
803
804 if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0)
805 return -EFAULT;
806 name[MODULE_NAME_LEN-1] = '\0';
807
Tejun Heo3fc1f1e2010-05-06 18:49:20 +0200808 if (mutex_lock_interruptible(&module_mutex) != 0)
809 return -EINTR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
811 mod = find_module(name);
812 if (!mod) {
813 ret = -ENOENT;
814 goto out;
815 }
816
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700817 if (!list_empty(&mod->source_list)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 /* Other modules depend on us: get rid of them first. */
819 ret = -EWOULDBLOCK;
820 goto out;
821 }
822
823 /* Doing init or already dying? */
824 if (mod->state != MODULE_STATE_LIVE) {
Rusty Russell3f2b9c92013-09-17 05:48:51 +0930825 /* FIXME: if (force), slam module count damn the torpedoes */
Jim Cromie5e124162011-12-06 12:11:31 -0700826 pr_debug("%s already dying\n", mod->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 ret = -EBUSY;
828 goto out;
829 }
830
831 /* If it has an init func, it must have an exit func to unload */
Rusty Russellaf49d922007-10-16 23:26:27 -0700832 if (mod->init && !mod->exit) {
Akinobu Mitafb169792006-01-08 01:04:29 -0800833 forced = try_force_unload(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 if (!forced) {
835 /* This module can't be removed */
836 ret = -EBUSY;
837 goto out;
838 }
839 }
840
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 /* Stop the machine so refcounts can't move and disable module. */
842 ret = try_stop_module(mod, flags, &forced);
843 if (ret != 0)
844 goto out;
845
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200846 mutex_unlock(&module_mutex);
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300847 /* Final destruction now no one is using it. */
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200848 if (mod->exit != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 mod->exit();
Peter Oberparleiterdf4b5652008-04-21 14:34:31 +0200850 blocking_notifier_call_chain(&module_notify_list,
851 MODULE_STATE_GOING, mod);
Arjan van de Ven22a9d642009-01-07 08:45:46 -0800852 async_synchronize_full();
Rusty Russell75676502010-06-05 11:17:36 -0600853
Arjan van de Vene14af7e2008-01-25 21:08:33 +0100854 /* Store the name of the last unloaded module for diagnostic purposes */
Rusty Russellefa53452008-01-29 17:13:20 -0500855 strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
Rusty Russell75676502010-06-05 11:17:36 -0600857 free_module(mod);
858 return 0;
859out:
Ashutosh Naik6389a382006-03-23 03:00:46 -0800860 mutex_unlock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 return ret;
862}
863
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800864static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
866 struct module_use *use;
867 int printed_something = 0;
868
Rusty Russelld5db1392015-01-22 11:13:14 +1030869 seq_printf(m, " %i ", module_refcount(mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870
Ionut Alexa6da0b562014-11-10 09:31:29 +1030871 /*
872 * Always include a trailing , so userspace can differentiate
873 * between this and the old multi-field proc format.
874 */
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700875 list_for_each_entry(use, &mod->source_list, source_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 printed_something = 1;
Linus Torvalds2c02dfe2010-05-31 12:19:37 -0700877 seq_printf(m, "%s,", use->source->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 }
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 if (mod->init != NULL && mod->exit == NULL) {
881 printed_something = 1;
Ionut Alexa6da0b562014-11-10 09:31:29 +1030882 seq_puts(m, "[permanent],");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 }
884
885 if (!printed_something)
Ionut Alexa6da0b562014-11-10 09:31:29 +1030886 seq_puts(m, "-");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887}
888
889void __symbol_put(const char *symbol)
890{
891 struct module *owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Rusty Russell24da1cb2007-07-15 23:41:46 -0700893 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -0500894 if (!find_symbol(symbol, &owner, NULL, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 BUG();
896 module_put(owner);
Rusty Russell24da1cb2007-07-15 23:41:46 -0700897 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898}
899EXPORT_SYMBOL(__symbol_put);
900
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930901/* Note this assumes addr is a function, which it currently always is. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902void symbol_put_addr(void *addr)
903{
Trent Piepho5e376612006-05-15 09:44:06 -0700904 struct module *modaddr;
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930905 unsigned long a = (unsigned long)dereference_function_descriptor(addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930907 if (core_kernel_text(a))
Trent Piepho5e376612006-05-15 09:44:06 -0700908 return;
909
Rusty Russella6e6abd2009-03-31 13:05:31 -0600910 /* module_text_address is safe here: we're supposed to have reference
911 * to module from symbol_get, so it can't go away. */
Rusty Russell7d1d16e2009-08-26 22:02:54 +0930912 modaddr = __module_text_address(a);
Rusty Russella6e6abd2009-03-31 13:05:31 -0600913 BUG_ON(!modaddr);
Trent Piepho5e376612006-05-15 09:44:06 -0700914 module_put(modaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915}
916EXPORT_SYMBOL_GPL(symbol_put_addr);
917
918static ssize_t show_refcnt(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +0930919 struct module_kobject *mk, char *buffer)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920{
Rusty Russelld5db1392015-01-22 11:13:14 +1030921 return sprintf(buffer, "%i\n", module_refcount(mk->mod));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922}
923
Kay Sieverscca3e702012-01-13 09:32:15 +1030924static struct module_attribute modinfo_refcnt =
925 __ATTR(refcnt, 0444, show_refcnt, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
Steven Rostedtd53799b2012-03-26 12:50:52 +1030927void __module_get(struct module *module)
928{
929 if (module) {
930 preempt_disable();
Masami Hiramatsu2f35c412014-11-10 09:29:29 +1030931 atomic_inc(&module->refcnt);
Steven Rostedtd53799b2012-03-26 12:50:52 +1030932 trace_module_get(module, _RET_IP_);
933 preempt_enable();
934 }
935}
936EXPORT_SYMBOL(__module_get);
937
938bool try_module_get(struct module *module)
939{
940 bool ret = true;
941
942 if (module) {
943 preempt_disable();
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030944 /* Note: here, we can fail to get a reference */
945 if (likely(module_is_live(module) &&
946 atomic_inc_not_zero(&module->refcnt) != 0))
Steven Rostedtd53799b2012-03-26 12:50:52 +1030947 trace_module_get(module, _RET_IP_);
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030948 else
Steven Rostedtd53799b2012-03-26 12:50:52 +1030949 ret = false;
950
951 preempt_enable();
952 }
953 return ret;
954}
955EXPORT_SYMBOL(try_module_get);
956
Al Virof6a57032006-10-18 01:47:25 -0400957void module_put(struct module *module)
958{
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030959 int ret;
960
Al Virof6a57032006-10-18 01:47:25 -0400961 if (module) {
Christoph Lametere1783a22010-01-05 15:34:50 +0900962 preempt_disable();
Masami Hiramatsue513cc12014-11-10 09:30:29 +1030963 ret = atomic_dec_if_positive(&module->refcnt);
964 WARN_ON(ret < 0); /* Failed to put refcount */
Li Zefanae832d12010-03-24 10:57:43 +0800965 trace_module_put(module, _RET_IP_);
Christoph Lametere1783a22010-01-05 15:34:50 +0900966 preempt_enable();
Al Virof6a57032006-10-18 01:47:25 -0400967 }
968}
969EXPORT_SYMBOL(module_put);
970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971#else /* !CONFIG_MODULE_UNLOAD */
Jianjun Kongd1e99d72008-12-08 14:26:29 +0800972static inline void print_unload_info(struct seq_file *m, struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973{
974 /* We don't know the usage count, or what modules are using. */
Ionut Alexa6da0b562014-11-10 09:31:29 +1030975 seq_puts(m, " - -");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
978static inline void module_unload_free(struct module *mod)
979{
980}
981
Rusty Russell9bea7f22010-06-05 11:17:37 -0600982int ref_module(struct module *a, struct module *b)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983{
Rusty Russell9bea7f22010-06-05 11:17:37 -0600984 return strong_try_module_get(b);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985}
Rusty Russell9bea7f22010-06-05 11:17:37 -0600986EXPORT_SYMBOL_GPL(ref_module);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600988static inline int module_unload_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989{
Rusty Russell9f85a4b2010-08-05 12:59:04 -0600990 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991}
992#endif /* CONFIG_MODULE_UNLOAD */
993
Kevin Winchester53999bf2012-01-15 19:32:55 -0400994static size_t module_flags_taint(struct module *mod, char *buf)
995{
996 size_t l = 0;
997
998 if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE))
999 buf[l++] = 'P';
1000 if (mod->taints & (1 << TAINT_OOT_MODULE))
1001 buf[l++] = 'O';
1002 if (mod->taints & (1 << TAINT_FORCED_MODULE))
1003 buf[l++] = 'F';
1004 if (mod->taints & (1 << TAINT_CRAP))
1005 buf[l++] = 'C';
Mathieu Desnoyers66cc69e2014-03-13 12:11:30 +10301006 if (mod->taints & (1 << TAINT_UNSIGNED_MODULE))
Rusty Russell57673c22014-03-31 14:39:57 +10301007 buf[l++] = 'E';
Kevin Winchester53999bf2012-01-15 19:32:55 -04001008 /*
1009 * TAINT_FORCED_RMMOD: could be added.
Dave Jones8c904872014-02-26 10:49:49 -05001010 * TAINT_CPU_OUT_OF_SPEC, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't
Kevin Winchester53999bf2012-01-15 19:32:55 -04001011 * apply to modules.
1012 */
1013 return l;
1014}
1015
Kay Sievers1f717402006-11-24 12:15:25 +01001016static ssize_t show_initstate(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +09301017 struct module_kobject *mk, char *buffer)
Kay Sievers1f717402006-11-24 12:15:25 +01001018{
1019 const char *state = "unknown";
1020
Kay Sievers4befb022011-07-24 22:06:04 +09301021 switch (mk->mod->state) {
Kay Sievers1f717402006-11-24 12:15:25 +01001022 case MODULE_STATE_LIVE:
1023 state = "live";
1024 break;
1025 case MODULE_STATE_COMING:
1026 state = "coming";
1027 break;
1028 case MODULE_STATE_GOING:
1029 state = "going";
1030 break;
Rusty Russell0d21b0e2013-01-12 11:38:44 +10301031 default:
1032 BUG();
Kay Sievers1f717402006-11-24 12:15:25 +01001033 }
1034 return sprintf(buffer, "%s\n", state);
1035}
1036
Kay Sieverscca3e702012-01-13 09:32:15 +10301037static struct module_attribute modinfo_initstate =
1038 __ATTR(initstate, 0444, show_initstate, NULL);
Kay Sievers1f717402006-11-24 12:15:25 +01001039
Kay Sievers88bfa3242011-07-24 22:06:04 +09301040static ssize_t store_uevent(struct module_attribute *mattr,
1041 struct module_kobject *mk,
1042 const char *buffer, size_t count)
1043{
1044 enum kobject_action action;
1045
1046 if (kobject_action_type(buffer, count, &action) == 0)
1047 kobject_uevent(&mk->kobj, action);
1048 return count;
1049}
1050
Kay Sieverscca3e702012-01-13 09:32:15 +10301051struct module_attribute module_uevent =
1052 __ATTR(uevent, 0200, NULL, store_uevent);
1053
1054static ssize_t show_coresize(struct module_attribute *mattr,
1055 struct module_kobject *mk, char *buffer)
1056{
1057 return sprintf(buffer, "%u\n", mk->mod->core_size);
1058}
1059
1060static struct module_attribute modinfo_coresize =
1061 __ATTR(coresize, 0444, show_coresize, NULL);
1062
1063static ssize_t show_initsize(struct module_attribute *mattr,
1064 struct module_kobject *mk, char *buffer)
1065{
1066 return sprintf(buffer, "%u\n", mk->mod->init_size);
1067}
1068
1069static struct module_attribute modinfo_initsize =
1070 __ATTR(initsize, 0444, show_initsize, NULL);
1071
1072static ssize_t show_taint(struct module_attribute *mattr,
1073 struct module_kobject *mk, char *buffer)
1074{
1075 size_t l;
1076
1077 l = module_flags_taint(mk->mod, buffer);
1078 buffer[l++] = '\n';
1079 return l;
1080}
1081
1082static struct module_attribute modinfo_taint =
1083 __ATTR(taint, 0444, show_taint, NULL);
Kay Sievers88bfa3242011-07-24 22:06:04 +09301084
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001085static struct module_attribute *modinfo_attrs[] = {
Kay Sieverscca3e702012-01-13 09:32:15 +10301086 &module_uevent,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001087 &modinfo_version,
1088 &modinfo_srcversion,
Kay Sieverscca3e702012-01-13 09:32:15 +10301089 &modinfo_initstate,
1090 &modinfo_coresize,
1091 &modinfo_initsize,
1092 &modinfo_taint,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001093#ifdef CONFIG_MODULE_UNLOAD
Kay Sieverscca3e702012-01-13 09:32:15 +10301094 &modinfo_refcnt,
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001095#endif
1096 NULL,
1097};
1098
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099static const char vermagic[] = VERMAGIC_STRING;
1100
Rusty Russellc6e665c2009-03-31 13:05:33 -06001101static int try_to_force_load(struct module *mod, const char *reason)
Linus Torvalds826e4502008-05-04 17:04:16 -07001102{
1103#ifdef CONFIG_MODULE_FORCE_LOAD
Andi Kleen25ddbb12008-10-15 22:01:41 -07001104 if (!test_taint(TAINT_FORCED_MODULE))
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001105 pr_warn("%s: %s: kernel tainted.\n", mod->name, reason);
Rusty Russell373d4d02013-01-21 17:17:39 +10301106 add_taint_module(mod, TAINT_FORCED_MODULE, LOCKDEP_NOW_UNRELIABLE);
Linus Torvalds826e4502008-05-04 17:04:16 -07001107 return 0;
1108#else
1109 return -ENOEXEC;
1110#endif
1111}
1112
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113#ifdef CONFIG_MODVERSIONS
Rusty Russelld4703ae2009-12-15 16:28:32 -06001114/* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */
1115static unsigned long maybe_relocated(unsigned long crc,
1116 const struct module *crc_owner)
1117{
1118#ifdef ARCH_RELOCATES_KCRCTAB
1119 if (crc_owner == NULL)
1120 return crc - (unsigned long)reloc_start;
1121#endif
1122 return crc;
1123}
1124
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125static int check_version(Elf_Shdr *sechdrs,
1126 unsigned int versindex,
1127 const char *symname,
Ionut Alexa6da0b562014-11-10 09:31:29 +10301128 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001129 const unsigned long *crc,
1130 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131{
1132 unsigned int i, num_versions;
1133 struct modversion_info *versions;
1134
1135 /* Exporting module didn't supply crcs? OK, we're already tainted. */
1136 if (!crc)
1137 return 1;
1138
Rusty Russella5dd6972008-05-09 16:24:21 +10001139 /* No versions at all? modprobe --force does this. */
1140 if (versindex == 0)
1141 return try_to_force_load(mod, symname) == 0;
1142
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 versions = (void *) sechdrs[versindex].sh_addr;
1144 num_versions = sechdrs[versindex].sh_size
1145 / sizeof(struct modversion_info);
1146
1147 for (i = 0; i < num_versions; i++) {
1148 if (strcmp(versions[i].name, symname) != 0)
1149 continue;
1150
Rusty Russelld4703ae2009-12-15 16:28:32 -06001151 if (versions[i].crc == maybe_relocated(*crc, crc_owner))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 return 1;
Jim Cromie5e124162011-12-06 12:11:31 -07001153 pr_debug("Found checksum %lX vs module %lX\n",
Rusty Russelld4703ae2009-12-15 16:28:32 -06001154 maybe_relocated(*crc, crc_owner), versions[i].crc);
Linus Torvalds826e4502008-05-04 17:04:16 -07001155 goto bad_version;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156 }
Linus Torvalds826e4502008-05-04 17:04:16 -07001157
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001158 pr_warn("%s: no symbol version for %s\n", mod->name, symname);
Rusty Russella5dd6972008-05-09 16:24:21 +10001159 return 0;
Linus Torvalds826e4502008-05-04 17:04:16 -07001160
1161bad_version:
Ionut Alexa6da0b562014-11-10 09:31:29 +10301162 pr_warn("%s: disagrees about version of symbol %s\n",
Linus Torvalds826e4502008-05-04 17:04:16 -07001163 mod->name, symname);
1164 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165}
1166
1167static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1168 unsigned int versindex,
1169 struct module *mod)
1170{
1171 const unsigned long *crc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
Rusty Russell75676502010-06-05 11:17:36 -06001173 /* Since this should be found in kernel (which can't be removed),
1174 * no locking is necessary. */
Rusty Russellb92021b2013-03-15 15:04:17 +10301175 if (!find_symbol(VMLINUX_SYMBOL_STR(module_layout), NULL,
Mike Frysinger6560dc12009-07-23 23:42:08 +09301176 &crc, true, false))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 BUG();
James Hogana4b6a772013-03-18 19:38:56 +10301178 return check_version(sechdrs, versindex,
1179 VMLINUX_SYMBOL_STR(module_layout), mod, crc,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001180 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181}
1182
Rusty Russell91e37a72008-05-09 16:25:28 +10001183/* First part is kernel version, which we ignore if module has crcs. */
1184static inline int same_magic(const char *amagic, const char *bmagic,
1185 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186{
Rusty Russell91e37a72008-05-09 16:25:28 +10001187 if (has_crcs) {
1188 amagic += strcspn(amagic, " ");
1189 bmagic += strcspn(bmagic, " ");
1190 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 return strcmp(amagic, bmagic) == 0;
1192}
1193#else
1194static inline int check_version(Elf_Shdr *sechdrs,
1195 unsigned int versindex,
1196 const char *symname,
Ionut Alexa6da0b562014-11-10 09:31:29 +10301197 struct module *mod,
Rusty Russelld4703ae2009-12-15 16:28:32 -06001198 const unsigned long *crc,
1199 const struct module *crc_owner)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200{
1201 return 1;
1202}
1203
1204static inline int check_modstruct_version(Elf_Shdr *sechdrs,
1205 unsigned int versindex,
1206 struct module *mod)
1207{
1208 return 1;
1209}
1210
Rusty Russell91e37a72008-05-09 16:25:28 +10001211static inline int same_magic(const char *amagic, const char *bmagic,
1212 bool has_crcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213{
1214 return strcmp(amagic, bmagic) == 0;
1215}
1216#endif /* CONFIG_MODVERSIONS */
1217
Rusty Russell75676502010-06-05 11:17:36 -06001218/* Resolve a symbol for this module. I.e. if we find one, record usage. */
Rusty Russell49668682010-08-05 12:59:10 -06001219static const struct kernel_symbol *resolve_symbol(struct module *mod,
1220 const struct load_info *info,
Tim Abbott414fd312008-12-05 19:03:56 -05001221 const char *name,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001222 char ownername[])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223{
1224 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001225 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 const unsigned long *crc;
Rusty Russell9bea7f22010-06-05 11:17:37 -06001227 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
Peter Zijlstrad64810f2015-02-11 15:01:13 +10301229 /*
1230 * The module_mutex should not be a heavily contended lock;
1231 * if we get the occasional sleep here, we'll go an extra iteration
1232 * in the wait_event_interruptible(), which is harmless.
1233 */
1234 sched_annotate_sleep();
Rusty Russell75676502010-06-05 11:17:36 -06001235 mutex_lock(&module_mutex);
Tim Abbott414fd312008-12-05 19:03:56 -05001236 sym = find_symbol(name, &owner, &crc,
Andi Kleen25ddbb12008-10-15 22:01:41 -07001237 !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001238 if (!sym)
1239 goto unlock;
1240
Rusty Russell49668682010-08-05 12:59:10 -06001241 if (!check_version(info->sechdrs, info->index.vers, name, mod, crc,
1242 owner)) {
Rusty Russell9bea7f22010-06-05 11:17:37 -06001243 sym = ERR_PTR(-EINVAL);
1244 goto getname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 }
Rusty Russell9bea7f22010-06-05 11:17:37 -06001246
1247 err = ref_module(mod, owner);
1248 if (err) {
1249 sym = ERR_PTR(err);
1250 goto getname;
1251 }
1252
1253getname:
1254 /* We must make copy under the lock if we failed to get ref. */
1255 strncpy(ownername, module_name(owner), MODULE_NAME_LEN);
1256unlock:
Rusty Russell75676502010-06-05 11:17:36 -06001257 mutex_unlock(&module_mutex);
Linus Torvalds218ce732010-05-25 16:48:30 -07001258 return sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259}
1260
Rusty Russell49668682010-08-05 12:59:10 -06001261static const struct kernel_symbol *
1262resolve_symbol_wait(struct module *mod,
1263 const struct load_info *info,
1264 const char *name)
Rusty Russell9bea7f22010-06-05 11:17:37 -06001265{
1266 const struct kernel_symbol *ksym;
Rusty Russell49668682010-08-05 12:59:10 -06001267 char owner[MODULE_NAME_LEN];
Rusty Russell9bea7f22010-06-05 11:17:37 -06001268
1269 if (wait_event_interruptible_timeout(module_wq,
Rusty Russell49668682010-08-05 12:59:10 -06001270 !IS_ERR(ksym = resolve_symbol(mod, info, name, owner))
1271 || PTR_ERR(ksym) != -EBUSY,
Rusty Russell9bea7f22010-06-05 11:17:37 -06001272 30 * HZ) <= 0) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001273 pr_warn("%s: gave up waiting for init of module %s.\n",
1274 mod->name, owner);
Rusty Russell9bea7f22010-06-05 11:17:37 -06001275 }
1276 return ksym;
1277}
1278
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279/*
1280 * /sys/module/foo/sections stuff
1281 * J. Corbet <corbet@lwn.net>
1282 */
Rusty Russell8f6d0372010-08-05 12:59:09 -06001283#ifdef CONFIG_SYSFS
Ben Hutchings10b465a2009-12-19 14:43:01 +00001284
Rusty Russell8f6d0372010-08-05 12:59:09 -06001285#ifdef CONFIG_KALLSYMS
Ben Hutchings10b465a2009-12-19 14:43:01 +00001286static inline bool sect_empty(const Elf_Shdr *sect)
1287{
1288 return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0;
1289}
1290
Ionut Alexa6da0b562014-11-10 09:31:29 +10301291struct module_sect_attr {
Rusty Russella58730c2008-03-13 09:03:44 +00001292 struct module_attribute mattr;
1293 char *name;
1294 unsigned long address;
1295};
1296
Ionut Alexa6da0b562014-11-10 09:31:29 +10301297struct module_sect_attrs {
Rusty Russella58730c2008-03-13 09:03:44 +00001298 struct attribute_group grp;
1299 unsigned int nsections;
1300 struct module_sect_attr attrs[0];
1301};
1302
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303static ssize_t module_sect_show(struct module_attribute *mattr,
Kay Sievers4befb022011-07-24 22:06:04 +09301304 struct module_kobject *mk, char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305{
1306 struct module_sect_attr *sattr =
1307 container_of(mattr, struct module_sect_attr, mattr);
Kees Cook9f36e2c2011-03-22 16:34:22 -07001308 return sprintf(buf, "0x%pK\n", (void *)sattr->address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309}
1310
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001311static void free_sect_attrs(struct module_sect_attrs *sect_attrs)
1312{
Rusty Russella58730c2008-03-13 09:03:44 +00001313 unsigned int section;
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001314
1315 for (section = 0; section < sect_attrs->nsections; section++)
1316 kfree(sect_attrs->attrs[section].name);
1317 kfree(sect_attrs);
1318}
1319
Rusty Russell8f6d0372010-08-05 12:59:09 -06001320static void add_sect_attrs(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321{
1322 unsigned int nloaded = 0, i, size[2];
1323 struct module_sect_attrs *sect_attrs;
1324 struct module_sect_attr *sattr;
1325 struct attribute **gattr;
Daniel Walker22a8bde2007-10-18 03:06:07 -07001326
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 /* Count loaded sections and allocate structures */
Rusty Russell8f6d0372010-08-05 12:59:09 -06001328 for (i = 0; i < info->hdr->e_shnum; i++)
1329 if (!sect_empty(&info->sechdrs[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 nloaded++;
1331 size[0] = ALIGN(sizeof(*sect_attrs)
1332 + nloaded * sizeof(sect_attrs->attrs[0]),
1333 sizeof(sect_attrs->grp.attrs[0]));
1334 size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]);
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001335 sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL);
1336 if (sect_attrs == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 return;
1338
1339 /* Setup section attributes. */
1340 sect_attrs->grp.name = "sections";
1341 sect_attrs->grp.attrs = (void *)sect_attrs + size[0];
1342
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001343 sect_attrs->nsections = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 sattr = &sect_attrs->attrs[0];
1345 gattr = &sect_attrs->grp.attrs[0];
Rusty Russell8f6d0372010-08-05 12:59:09 -06001346 for (i = 0; i < info->hdr->e_shnum; i++) {
1347 Elf_Shdr *sec = &info->sechdrs[i];
1348 if (sect_empty(sec))
Helge Deller35dead42009-12-03 00:29:15 +01001349 continue;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001350 sattr->address = sec->sh_addr;
1351 sattr->name = kstrdup(info->secstrings + sec->sh_name,
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001352 GFP_KERNEL);
1353 if (sattr->name == NULL)
1354 goto out;
1355 sect_attrs->nsections++;
Eric W. Biederman361795b2010-02-12 13:41:56 -08001356 sysfs_attr_init(&sattr->mattr.attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 sattr->mattr.show = module_sect_show;
1358 sattr->mattr.store = NULL;
1359 sattr->mattr.attr.name = sattr->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 sattr->mattr.attr.mode = S_IRUGO;
1361 *(gattr++) = &(sattr++)->mattr.attr;
1362 }
1363 *gattr = NULL;
1364
1365 if (sysfs_create_group(&mod->mkobj.kobj, &sect_attrs->grp))
1366 goto out;
1367
1368 mod->sect_attrs = sect_attrs;
1369 return;
1370 out:
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001371 free_sect_attrs(sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372}
1373
1374static void remove_sect_attrs(struct module *mod)
1375{
1376 if (mod->sect_attrs) {
1377 sysfs_remove_group(&mod->mkobj.kobj,
1378 &mod->sect_attrs->grp);
1379 /* We are positive that no one is using any sect attrs
1380 * at this point. Deallocate immediately. */
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001381 free_sect_attrs(mod->sect_attrs);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 mod->sect_attrs = NULL;
1383 }
1384}
1385
Roland McGrath6d760132007-10-16 23:26:40 -07001386/*
1387 * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections.
1388 */
1389
1390struct module_notes_attrs {
1391 struct kobject *dir;
1392 unsigned int notes;
1393 struct bin_attribute attrs[0];
1394};
1395
Chris Wright2c3c8be2010-05-12 18:28:57 -07001396static ssize_t module_notes_read(struct file *filp, struct kobject *kobj,
Roland McGrath6d760132007-10-16 23:26:40 -07001397 struct bin_attribute *bin_attr,
1398 char *buf, loff_t pos, size_t count)
1399{
1400 /*
1401 * The caller checked the pos and count against our size.
1402 */
1403 memcpy(buf, bin_attr->private + pos, count);
1404 return count;
1405}
1406
1407static void free_notes_attrs(struct module_notes_attrs *notes_attrs,
1408 unsigned int i)
1409{
1410 if (notes_attrs->dir) {
1411 while (i-- > 0)
1412 sysfs_remove_bin_file(notes_attrs->dir,
1413 &notes_attrs->attrs[i]);
Alexey Dobriyane9432092008-09-23 23:51:11 +04001414 kobject_put(notes_attrs->dir);
Roland McGrath6d760132007-10-16 23:26:40 -07001415 }
1416 kfree(notes_attrs);
1417}
1418
Rusty Russell8f6d0372010-08-05 12:59:09 -06001419static void add_notes_attrs(struct module *mod, const struct load_info *info)
Roland McGrath6d760132007-10-16 23:26:40 -07001420{
1421 unsigned int notes, loaded, i;
1422 struct module_notes_attrs *notes_attrs;
1423 struct bin_attribute *nattr;
1424
Ingo Molnarea6bff32009-08-28 10:44:56 +02001425 /* failed to create section attributes, so can't create notes */
1426 if (!mod->sect_attrs)
1427 return;
1428
Roland McGrath6d760132007-10-16 23:26:40 -07001429 /* Count notes sections and allocate structures. */
1430 notes = 0;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001431 for (i = 0; i < info->hdr->e_shnum; i++)
1432 if (!sect_empty(&info->sechdrs[i]) &&
1433 (info->sechdrs[i].sh_type == SHT_NOTE))
Roland McGrath6d760132007-10-16 23:26:40 -07001434 ++notes;
1435
1436 if (notes == 0)
1437 return;
1438
1439 notes_attrs = kzalloc(sizeof(*notes_attrs)
1440 + notes * sizeof(notes_attrs->attrs[0]),
1441 GFP_KERNEL);
1442 if (notes_attrs == NULL)
1443 return;
1444
1445 notes_attrs->notes = notes;
1446 nattr = &notes_attrs->attrs[0];
Rusty Russell8f6d0372010-08-05 12:59:09 -06001447 for (loaded = i = 0; i < info->hdr->e_shnum; ++i) {
1448 if (sect_empty(&info->sechdrs[i]))
Roland McGrath6d760132007-10-16 23:26:40 -07001449 continue;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001450 if (info->sechdrs[i].sh_type == SHT_NOTE) {
Eric W. Biederman361795b2010-02-12 13:41:56 -08001451 sysfs_bin_attr_init(nattr);
Roland McGrath6d760132007-10-16 23:26:40 -07001452 nattr->attr.name = mod->sect_attrs->attrs[loaded].name;
1453 nattr->attr.mode = S_IRUGO;
Rusty Russell8f6d0372010-08-05 12:59:09 -06001454 nattr->size = info->sechdrs[i].sh_size;
1455 nattr->private = (void *) info->sechdrs[i].sh_addr;
Roland McGrath6d760132007-10-16 23:26:40 -07001456 nattr->read = module_notes_read;
1457 ++nattr;
1458 }
1459 ++loaded;
1460 }
1461
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001462 notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj);
Roland McGrath6d760132007-10-16 23:26:40 -07001463 if (!notes_attrs->dir)
1464 goto out;
1465
1466 for (i = 0; i < notes; ++i)
1467 if (sysfs_create_bin_file(notes_attrs->dir,
1468 &notes_attrs->attrs[i]))
1469 goto out;
1470
1471 mod->notes_attrs = notes_attrs;
1472 return;
1473
1474 out:
1475 free_notes_attrs(notes_attrs, i);
1476}
1477
1478static void remove_notes_attrs(struct module *mod)
1479{
1480 if (mod->notes_attrs)
1481 free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes);
1482}
1483
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484#else
Ian S. Nelson04b1db92006-09-29 02:01:31 -07001485
Rusty Russell8f6d0372010-08-05 12:59:09 -06001486static inline void add_sect_attrs(struct module *mod,
1487 const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488{
1489}
1490
1491static inline void remove_sect_attrs(struct module *mod)
1492{
1493}
Roland McGrath6d760132007-10-16 23:26:40 -07001494
Rusty Russell8f6d0372010-08-05 12:59:09 -06001495static inline void add_notes_attrs(struct module *mod,
1496 const struct load_info *info)
Roland McGrath6d760132007-10-16 23:26:40 -07001497{
1498}
1499
1500static inline void remove_notes_attrs(struct module *mod)
1501{
1502}
Rusty Russell8f6d0372010-08-05 12:59:09 -06001503#endif /* CONFIG_KALLSYMS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001505static void add_usage_links(struct module *mod)
1506{
1507#ifdef CONFIG_MODULE_UNLOAD
1508 struct module_use *use;
1509 int nowarn;
1510
Rusty Russell75676502010-06-05 11:17:36 -06001511 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001512 list_for_each_entry(use, &mod->target_list, target_list) {
1513 nowarn = sysfs_create_link(use->target->holders_dir,
1514 &mod->mkobj.kobj, mod->name);
1515 }
Rusty Russell75676502010-06-05 11:17:36 -06001516 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001517#endif
1518}
1519
1520static void del_usage_links(struct module *mod)
1521{
1522#ifdef CONFIG_MODULE_UNLOAD
1523 struct module_use *use;
1524
Rusty Russell75676502010-06-05 11:17:36 -06001525 mutex_lock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001526 list_for_each_entry(use, &mod->target_list, target_list)
1527 sysfs_remove_link(use->target->holders_dir, mod->name);
Rusty Russell75676502010-06-05 11:17:36 -06001528 mutex_unlock(&module_mutex);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001529#endif
1530}
1531
Rusty Russell6407ebb22010-06-05 11:17:36 -06001532static int module_add_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001533{
1534 struct module_attribute *attr;
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001535 struct module_attribute *temp_attr;
Matt Domschc988d2b2005-06-23 22:05:15 -07001536 int error = 0;
1537 int i;
1538
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001539 mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) *
1540 (ARRAY_SIZE(modinfo_attrs) + 1)),
1541 GFP_KERNEL);
1542 if (!mod->modinfo_attrs)
1543 return -ENOMEM;
1544
1545 temp_attr = mod->modinfo_attrs;
Matt Domschc988d2b2005-06-23 22:05:15 -07001546 for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
1547 if (!attr->test ||
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001548 (attr->test && attr->test(mod))) {
1549 memcpy(temp_attr, attr, sizeof(*temp_attr));
Eric W. Biederman361795b2010-02-12 13:41:56 -08001550 sysfs_attr_init(&temp_attr->attr);
Ionut Alexa6da0b562014-11-10 09:31:29 +10301551 error = sysfs_create_file(&mod->mkobj.kobj,
1552 &temp_attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001553 ++temp_attr;
1554 }
Matt Domschc988d2b2005-06-23 22:05:15 -07001555 }
1556 return error;
1557}
1558
Rusty Russell6407ebb22010-06-05 11:17:36 -06001559static void module_remove_modinfo_attrs(struct module *mod)
Matt Domschc988d2b2005-06-23 22:05:15 -07001560{
1561 struct module_attribute *attr;
1562 int i;
1563
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001564 for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
1565 /* pick a field to test for end of list */
1566 if (!attr->attr.name)
1567 break;
Ionut Alexa6da0b562014-11-10 09:31:29 +10301568 sysfs_remove_file(&mod->mkobj.kobj, &attr->attr);
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001569 if (attr->free)
1570 attr->free(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001571 }
Greg Kroah-Hartman03e88ae12006-02-16 13:50:23 -08001572 kfree(mod->modinfo_attrs);
Matt Domschc988d2b2005-06-23 22:05:15 -07001573}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574
Li Zhong942e4432013-09-03 16:33:57 +09301575static void mod_kobject_put(struct module *mod)
1576{
1577 DECLARE_COMPLETION_ONSTACK(c);
1578 mod->mkobj.kobj_completion = &c;
1579 kobject_put(&mod->mkobj.kobj);
1580 wait_for_completion(&c);
1581}
1582
Rusty Russell6407ebb22010-06-05 11:17:36 -06001583static int mod_sysfs_init(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584{
1585 int err;
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001586 struct kobject *kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587
Greg Kroah-Hartman823bccf2007-04-13 13:15:19 -07001588 if (!module_sysfs_initialized) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001589 pr_err("%s: module sysfs not initialized\n", mod->name);
Ed Swierk1cc5f712006-09-25 16:25:36 -07001590 err = -EINVAL;
1591 goto out;
1592 }
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001593
1594 kobj = kset_find_obj(module_kset, mod->name);
1595 if (kobj) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001596 pr_err("%s: module is already loaded\n", mod->name);
Greg Kroah-Hartman6494a932008-01-27 15:38:40 -08001597 kobject_put(kobj);
1598 err = -EINVAL;
1599 goto out;
1600 }
1601
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 mod->mkobj.mod = mod;
Kay Sieverse17e0f52006-11-24 12:15:25 +01001603
Greg Kroah-Hartmanac3c8142007-12-17 23:05:35 -07001604 memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj));
1605 mod->mkobj.kobj.kset = module_kset;
1606 err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL,
1607 "%s", mod->name);
1608 if (err)
Li Zhong942e4432013-09-03 16:33:57 +09301609 mod_kobject_put(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001610
Kay Sievers97c146e2007-11-29 23:46:11 +01001611 /* delay uevent until full sysfs population */
Kay Sievers270a6c42007-01-18 13:26:15 +01001612out:
1613 return err;
1614}
1615
Rusty Russell6407ebb22010-06-05 11:17:36 -06001616static int mod_sysfs_setup(struct module *mod,
Rusty Russell8f6d0372010-08-05 12:59:09 -06001617 const struct load_info *info,
Kay Sievers270a6c42007-01-18 13:26:15 +01001618 struct kernel_param *kparam,
1619 unsigned int num_params)
1620{
1621 int err;
1622
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001623 err = mod_sysfs_init(mod);
1624 if (err)
1625 goto out;
1626
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -08001627 mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj);
Akinobu Mita240936e2007-04-26 00:12:09 -07001628 if (!mod->holders_dir) {
1629 err = -ENOMEM;
Kay Sievers270a6c42007-01-18 13:26:15 +01001630 goto out_unreg;
Akinobu Mita240936e2007-04-26 00:12:09 -07001631 }
Kay Sievers270a6c42007-01-18 13:26:15 +01001632
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 err = module_param_sysfs_setup(mod, kparam, num_params);
1634 if (err)
Kay Sievers270a6c42007-01-18 13:26:15 +01001635 goto out_unreg_holders;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636
Matt Domschc988d2b2005-06-23 22:05:15 -07001637 err = module_add_modinfo_attrs(mod);
1638 if (err)
Kay Sieverse17e0f52006-11-24 12:15:25 +01001639 goto out_unreg_param;
Matt Domschc988d2b2005-06-23 22:05:15 -07001640
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001641 add_usage_links(mod);
Rusty Russell8f6d0372010-08-05 12:59:09 -06001642 add_sect_attrs(mod, info);
1643 add_notes_attrs(mod, info);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001644
Kay Sieverse17e0f52006-11-24 12:15:25 +01001645 kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 return 0;
1647
Kay Sieverse17e0f52006-11-24 12:15:25 +01001648out_unreg_param:
1649 module_param_sysfs_remove(mod);
Kay Sievers270a6c42007-01-18 13:26:15 +01001650out_unreg_holders:
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001651 kobject_put(mod->holders_dir);
Kay Sievers270a6c42007-01-18 13:26:15 +01001652out_unreg:
Li Zhong942e4432013-09-03 16:33:57 +09301653 mod_kobject_put(mod);
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001654out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 return err;
1656}
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001657
1658static void mod_sysfs_fini(struct module *mod)
1659{
Rusty Russell8f6d0372010-08-05 12:59:09 -06001660 remove_notes_attrs(mod);
1661 remove_sect_attrs(mod);
Li Zhong942e4432013-09-03 16:33:57 +09301662 mod_kobject_put(mod);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001663}
1664
Rusty Russell8f6d0372010-08-05 12:59:09 -06001665#else /* !CONFIG_SYSFS */
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001666
Rusty Russell8f6d0372010-08-05 12:59:09 -06001667static int mod_sysfs_setup(struct module *mod,
1668 const struct load_info *info,
Rusty Russell6407ebb22010-06-05 11:17:36 -06001669 struct kernel_param *kparam,
1670 unsigned int num_params)
1671{
1672 return 0;
1673}
1674
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001675static void mod_sysfs_fini(struct module *mod)
1676{
1677}
1678
Rusty Russell36b03602010-08-05 12:59:09 -06001679static void module_remove_modinfo_attrs(struct module *mod)
1680{
1681}
1682
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001683static void del_usage_links(struct module *mod)
1684{
1685}
1686
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001687#endif /* CONFIG_SYSFS */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688
Rusty Russell36b03602010-08-05 12:59:09 -06001689static void mod_sysfs_teardown(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690{
Rusty Russell80a3d1b2010-06-05 11:17:36 -06001691 del_usage_links(mod);
Matt Domschc988d2b2005-06-23 22:05:15 -07001692 module_remove_modinfo_attrs(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 module_param_sysfs_remove(mod);
Greg Kroah-Hartman78a2d902007-12-20 08:13:05 -08001694 kobject_put(mod->mkobj.drivers_dir);
1695 kobject_put(mod->holders_dir);
Denis V. Lunev34e4e2f2008-05-20 13:59:48 +04001696 mod_sysfs_fini(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697}
1698
matthieu castet84e1c6b2010-11-16 22:35:16 +01001699#ifdef CONFIG_DEBUG_SET_MODULE_RONX
1700/*
1701 * LKM RO/NX protection: protect module's text/ro-data
1702 * from modification and any data from execution.
1703 */
1704void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages))
1705{
1706 unsigned long begin_pfn = PFN_DOWN((unsigned long)start);
1707 unsigned long end_pfn = PFN_DOWN((unsigned long)end);
1708
1709 if (end_pfn > begin_pfn)
1710 set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1711}
1712
1713static void set_section_ro_nx(void *base,
1714 unsigned long text_size,
1715 unsigned long ro_size,
1716 unsigned long total_size)
1717{
1718 /* begin and end PFNs of the current subsection */
1719 unsigned long begin_pfn;
1720 unsigned long end_pfn;
1721
1722 /*
1723 * Set RO for module text and RO-data:
1724 * - Always protect first page.
1725 * - Do not protect last partial page.
1726 */
1727 if (ro_size > 0)
1728 set_page_attributes(base, base + ro_size, set_memory_ro);
1729
1730 /*
1731 * Set NX permissions for module data:
1732 * - Do not protect first partial page.
1733 * - Always protect last page.
1734 */
1735 if (total_size > text_size) {
1736 begin_pfn = PFN_UP((unsigned long)base + text_size);
1737 end_pfn = PFN_UP((unsigned long)base + total_size);
1738 if (end_pfn > begin_pfn)
1739 set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn);
1740 }
1741}
1742
Jan Glauber01526ed2011-05-19 16:55:26 -06001743static void unset_module_core_ro_nx(struct module *mod)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001744{
Jan Glauber01526ed2011-05-19 16:55:26 -06001745 set_page_attributes(mod->module_core + mod->core_text_size,
1746 mod->module_core + mod->core_size,
1747 set_memory_x);
1748 set_page_attributes(mod->module_core,
1749 mod->module_core + mod->core_ro_size,
1750 set_memory_rw);
1751}
1752
1753static void unset_module_init_ro_nx(struct module *mod)
1754{
1755 set_page_attributes(mod->module_init + mod->init_text_size,
1756 mod->module_init + mod->init_size,
1757 set_memory_x);
1758 set_page_attributes(mod->module_init,
1759 mod->module_init + mod->init_ro_size,
1760 set_memory_rw);
matthieu castet84e1c6b2010-11-16 22:35:16 +01001761}
1762
1763/* Iterate through all modules and set each module's text as RW */
Daniel J Blueman5d05c702011-03-08 22:01:47 +08001764void set_all_modules_text_rw(void)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001765{
1766 struct module *mod;
1767
1768 mutex_lock(&module_mutex);
1769 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10301770 if (mod->state == MODULE_STATE_UNFORMED)
1771 continue;
matthieu castet84e1c6b2010-11-16 22:35:16 +01001772 if ((mod->module_core) && (mod->core_text_size)) {
1773 set_page_attributes(mod->module_core,
1774 mod->module_core + mod->core_text_size,
1775 set_memory_rw);
1776 }
1777 if ((mod->module_init) && (mod->init_text_size)) {
1778 set_page_attributes(mod->module_init,
1779 mod->module_init + mod->init_text_size,
1780 set_memory_rw);
1781 }
1782 }
1783 mutex_unlock(&module_mutex);
1784}
1785
1786/* Iterate through all modules and set each module's text as RO */
Daniel J Blueman5d05c702011-03-08 22:01:47 +08001787void set_all_modules_text_ro(void)
matthieu castet84e1c6b2010-11-16 22:35:16 +01001788{
1789 struct module *mod;
1790
1791 mutex_lock(&module_mutex);
1792 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10301793 if (mod->state == MODULE_STATE_UNFORMED)
1794 continue;
matthieu castet84e1c6b2010-11-16 22:35:16 +01001795 if ((mod->module_core) && (mod->core_text_size)) {
1796 set_page_attributes(mod->module_core,
1797 mod->module_core + mod->core_text_size,
1798 set_memory_ro);
1799 }
1800 if ((mod->module_init) && (mod->init_text_size)) {
1801 set_page_attributes(mod->module_init,
1802 mod->module_init + mod->init_text_size,
1803 set_memory_ro);
1804 }
1805 }
1806 mutex_unlock(&module_mutex);
1807}
1808#else
1809static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { }
Jan Glauber01526ed2011-05-19 16:55:26 -06001810static void unset_module_core_ro_nx(struct module *mod) { }
1811static void unset_module_init_ro_nx(struct module *mod) { }
matthieu castet84e1c6b2010-11-16 22:35:16 +01001812#endif
1813
Rusty Russellbe1f2212015-01-20 09:07:05 +10301814void __weak module_memfree(void *module_region)
Jonas Bonn74e08fc2011-06-30 21:22:11 +02001815{
1816 vfree(module_region);
Andrey Ryabininbebf56a2015-02-13 14:40:17 -08001817 kasan_module_free(module_region);
Jonas Bonn74e08fc2011-06-30 21:22:11 +02001818}
1819
1820void __weak module_arch_cleanup(struct module *mod)
1821{
1822}
1823
Rusty Russelld453cde2015-01-20 09:07:04 +10301824void __weak module_arch_freeing_init(struct module *mod)
1825{
1826}
1827
Rusty Russell75676502010-06-05 11:17:36 -06001828/* Free a module, remove from lists, etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829static void free_module(struct module *mod)
1830{
Li Zefan7ead8b82009-08-17 16:56:28 +08001831 trace_module_free(mod);
1832
Rusty Russell36b03602010-08-05 12:59:09 -06001833 mod_sysfs_teardown(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834
Rusty Russell944a1fa2013-04-17 13:20:03 +09301835 /* We leave it in list to prevent duplicate loads, but make sure
1836 * that noone uses it while it's being deconstructed. */
Prarit Bhargavad3051b42014-10-14 02:51:39 +10301837 mutex_lock(&module_mutex);
Rusty Russell944a1fa2013-04-17 13:20:03 +09301838 mod->state = MODULE_STATE_UNFORMED;
Prarit Bhargavad3051b42014-10-14 02:51:39 +10301839 mutex_unlock(&module_mutex);
Rusty Russell944a1fa2013-04-17 13:20:03 +09301840
Jason Baronb82bab4b2010-07-27 13:18:01 -07001841 /* Remove dynamic debug info */
1842 ddebug_remove_module(mod->name);
1843
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 /* Arch-specific cleanup. */
1845 module_arch_cleanup(mod);
1846
1847 /* Module unload stuff */
1848 module_unload_free(mod);
1849
Rusty Russelle180a6b2009-03-31 13:05:29 -06001850 /* Free any allocated parameters. */
1851 destroy_params(mod->kp, mod->num_kp);
1852
Rusty Russell944a1fa2013-04-17 13:20:03 +09301853 /* Now we can delete it from the lists */
1854 mutex_lock(&module_mutex);
Masami Hiramatsu461e34a2014-11-10 09:27:29 +10301855 /* Unlink carefully: kallsyms could be walking list. */
1856 list_del_rcu(&mod->list);
Masami Hiramatsu0286b5e2014-11-10 09:28:29 +10301857 /* Remove this module from bug list, this uses list_del_rcu */
Masami Hiramatsu461e34a2014-11-10 09:27:29 +10301858 module_bug_cleanup(mod);
Masami Hiramatsu0286b5e2014-11-10 09:28:29 +10301859 /* Wait for RCU synchronizing before releasing mod->list and buglist. */
1860 synchronize_rcu();
Rusty Russell944a1fa2013-04-17 13:20:03 +09301861 mutex_unlock(&module_mutex);
1862
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 /* This may be NULL, but that's OK */
Jan Glauber01526ed2011-05-19 16:55:26 -06001864 unset_module_init_ro_nx(mod);
Rusty Russelld453cde2015-01-20 09:07:04 +10301865 module_arch_freeing_init(mod);
Rusty Russellbe1f2212015-01-20 09:07:05 +10301866 module_memfree(mod->module_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 kfree(mod->args);
Tejun Heo259354d2010-03-10 18:56:10 +09001868 percpu_modfree(mod);
Rusty Russell9f85a4b2010-08-05 12:59:04 -06001869
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001870 /* Free lock-classes: */
1871 lockdep_free_key_range(mod->module_core, mod->core_size);
1872
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 /* Finally, free the core (containing the module structure) */
Jan Glauber01526ed2011-05-19 16:55:26 -06001874 unset_module_core_ro_nx(mod);
Rusty Russellbe1f2212015-01-20 09:07:05 +10301875 module_memfree(mod->module_core);
Bernd Schmidteb8cdec2009-09-21 17:03:57 -07001876
1877#ifdef CONFIG_MPU
1878 update_protections(current->mm);
1879#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880}
1881
1882void *__symbol_get(const char *symbol)
1883{
1884 struct module *owner;
Tim Abbott414fd312008-12-05 19:03:56 -05001885 const struct kernel_symbol *sym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886
Rusty Russell24da1cb2007-07-15 23:41:46 -07001887 preempt_disable();
Tim Abbott414fd312008-12-05 19:03:56 -05001888 sym = find_symbol(symbol, &owner, NULL, true, true);
1889 if (sym && strong_try_module_get(owner))
1890 sym = NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07001891 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892
Tim Abbott414fd312008-12-05 19:03:56 -05001893 return sym ? (void *)sym->value : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894}
1895EXPORT_SYMBOL_GPL(__symbol_get);
1896
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001897/*
1898 * Ensure that an exported symbol [global namespace] does not already exist
Robert P. J. Day02a3e592007-05-09 07:26:28 +02001899 * in the kernel or in some other module's exported symbol table.
Rusty Russellbe593f42010-06-05 11:17:37 -06001900 *
1901 * You must hold the module_mutex.
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001902 */
1903static int verify_export_symbols(struct module *mod)
1904{
Rusty Russellb2111042008-05-01 21:15:00 -05001905 unsigned int i;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001906 struct module *owner;
Rusty Russellb2111042008-05-01 21:15:00 -05001907 const struct kernel_symbol *s;
1908 struct {
1909 const struct kernel_symbol *sym;
1910 unsigned int num;
1911 } arr[] = {
1912 { mod->syms, mod->num_syms },
1913 { mod->gpl_syms, mod->num_gpl_syms },
1914 { mod->gpl_future_syms, mod->num_gpl_future_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001915#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russellb2111042008-05-01 21:15:00 -05001916 { mod->unused_syms, mod->num_unused_syms },
1917 { mod->unused_gpl_syms, mod->num_unused_gpl_syms },
Denys Vlasenkof7f5b672008-07-22 19:24:26 -05001918#endif
Rusty Russellb2111042008-05-01 21:15:00 -05001919 };
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001920
Rusty Russellb2111042008-05-01 21:15:00 -05001921 for (i = 0; i < ARRAY_SIZE(arr); i++) {
1922 for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) {
Rusty Russellbe593f42010-06-05 11:17:37 -06001923 if (find_symbol(s->name, &owner, NULL, true, false)) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001924 pr_err("%s: exports duplicate symbol %s"
Rusty Russellb2111042008-05-01 21:15:00 -05001925 " (owned by %s)\n",
1926 mod->name, s->name, module_name(owner));
1927 return -ENOEXEC;
1928 }
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001929 }
Rusty Russellb2111042008-05-01 21:15:00 -05001930 }
1931 return 0;
Ashutosh Naikeea8b542006-01-08 01:04:25 -08001932}
1933
Matti Linnanvuori9a4b9702007-11-08 08:37:38 -08001934/* Change all symbols so that st_value encodes the pointer directly. */
Rusty Russell49668682010-08-05 12:59:10 -06001935static int simplify_symbols(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936{
Rusty Russell49668682010-08-05 12:59:10 -06001937 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
1938 Elf_Sym *sym = (void *)symsec->sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939 unsigned long secbase;
Rusty Russell49668682010-08-05 12:59:10 -06001940 unsigned int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 int ret = 0;
Tim Abbott414fd312008-12-05 19:03:56 -05001942 const struct kernel_symbol *ksym;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943
Rusty Russell49668682010-08-05 12:59:10 -06001944 for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) {
1945 const char *name = info->strtab + sym[i].st_name;
1946
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 switch (sym[i].st_shndx) {
1948 case SHN_COMMON:
Joe Mario80375982014-02-08 09:01:09 +01001949 /* Ignore common symbols */
1950 if (!strncmp(name, "__gnu_lto", 9))
1951 break;
1952
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 /* We compiled with -fno-common. These are not
1954 supposed to happen. */
Jim Cromie5e124162011-12-06 12:11:31 -07001955 pr_debug("Common symbol: %s\n", name);
Ionut Alexa6da0b562014-11-10 09:31:29 +10301956 pr_warn("%s: please compile with -fno-common\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957 mod->name);
1958 ret = -ENOEXEC;
1959 break;
1960
1961 case SHN_ABS:
1962 /* Don't need to do anything */
Jim Cromie5e124162011-12-06 12:11:31 -07001963 pr_debug("Absolute symbol: 0x%08lx\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 (long)sym[i].st_value);
1965 break;
1966
1967 case SHN_UNDEF:
Rusty Russell49668682010-08-05 12:59:10 -06001968 ksym = resolve_symbol_wait(mod, info, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969 /* Ok if resolved. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001970 if (ksym && !IS_ERR(ksym)) {
Tim Abbott414fd312008-12-05 19:03:56 -05001971 sym[i].st_value = ksym->value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 break;
Tim Abbott414fd312008-12-05 19:03:56 -05001973 }
1974
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 /* Ok if weak. */
Rusty Russell9bea7f22010-06-05 11:17:37 -06001976 if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 break;
1978
Andrew Mortonbddb12b2013-11-12 15:11:28 -08001979 pr_warn("%s: Unknown symbol %s (err %li)\n",
1980 mod->name, name, PTR_ERR(ksym));
Rusty Russell9bea7f22010-06-05 11:17:37 -06001981 ret = PTR_ERR(ksym) ?: -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982 break;
1983
1984 default:
1985 /* Divert to percpu allocation if a percpu var. */
Rusty Russell49668682010-08-05 12:59:10 -06001986 if (sym[i].st_shndx == info->index.pcpu)
Tejun Heo259354d2010-03-10 18:56:10 +09001987 secbase = (unsigned long)mod_percpu(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988 else
Rusty Russell49668682010-08-05 12:59:10 -06001989 secbase = info->sechdrs[sym[i].st_shndx].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001990 sym[i].st_value += secbase;
1991 break;
1992 }
1993 }
1994
1995 return ret;
1996}
1997
Rusty Russell49668682010-08-05 12:59:10 -06001998static int apply_relocations(struct module *mod, const struct load_info *info)
Rusty Russell22e268e2010-08-05 12:59:05 -06001999{
2000 unsigned int i;
2001 int err = 0;
2002
2003 /* Now do relocations. */
Rusty Russell49668682010-08-05 12:59:10 -06002004 for (i = 1; i < info->hdr->e_shnum; i++) {
2005 unsigned int infosec = info->sechdrs[i].sh_info;
Rusty Russell22e268e2010-08-05 12:59:05 -06002006
2007 /* Not a valid relocation section? */
Rusty Russell49668682010-08-05 12:59:10 -06002008 if (infosec >= info->hdr->e_shnum)
Rusty Russell22e268e2010-08-05 12:59:05 -06002009 continue;
2010
2011 /* Don't bother with non-allocated sections */
Rusty Russell49668682010-08-05 12:59:10 -06002012 if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC))
Rusty Russell22e268e2010-08-05 12:59:05 -06002013 continue;
2014
Rusty Russell49668682010-08-05 12:59:10 -06002015 if (info->sechdrs[i].sh_type == SHT_REL)
2016 err = apply_relocate(info->sechdrs, info->strtab,
2017 info->index.sym, i, mod);
2018 else if (info->sechdrs[i].sh_type == SHT_RELA)
2019 err = apply_relocate_add(info->sechdrs, info->strtab,
2020 info->index.sym, i, mod);
Rusty Russell22e268e2010-08-05 12:59:05 -06002021 if (err < 0)
2022 break;
2023 }
2024 return err;
2025}
2026
Helge Deller088af9a2008-12-31 12:31:18 +01002027/* Additional bytes needed by arch in front of individual sections */
2028unsigned int __weak arch_mod_section_prepend(struct module *mod,
2029 unsigned int section)
2030{
2031 /* default implementation just returns zero */
2032 return 0;
2033}
2034
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035/* Update size with this section: return offset. */
Helge Deller088af9a2008-12-31 12:31:18 +01002036static long get_offset(struct module *mod, unsigned int *size,
2037 Elf_Shdr *sechdr, unsigned int section)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038{
2039 long ret;
2040
Helge Deller088af9a2008-12-31 12:31:18 +01002041 *size += arch_mod_section_prepend(mod, section);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
2043 *size = ret + sechdr->sh_size;
2044 return ret;
2045}
2046
2047/* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld
2048 might -- code, read-only data, read-write data, small data. Tally
2049 sizes, and place the offsets into sh_entsize fields: high bit means it
2050 belongs in init. */
Rusty Russell49668682010-08-05 12:59:10 -06002051static void layout_sections(struct module *mod, struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052{
2053 static unsigned long const masks[][2] = {
2054 /* NOTE: all executable code must be the first section
2055 * in this array; otherwise modify the text_size
2056 * finder in the two loops below */
2057 { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL },
2058 { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL },
2059 { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL },
2060 { ARCH_SHF_SMALL | SHF_ALLOC, 0 }
2061 };
2062 unsigned int m, i;
2063
Rusty Russell49668682010-08-05 12:59:10 -06002064 for (i = 0; i < info->hdr->e_shnum; i++)
2065 info->sechdrs[i].sh_entsize = ~0UL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066
Jim Cromie5e124162011-12-06 12:11:31 -07002067 pr_debug("Core section allocation order:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
Rusty Russell49668682010-08-05 12:59:10 -06002069 for (i = 0; i < info->hdr->e_shnum; ++i) {
2070 Elf_Shdr *s = &info->sechdrs[i];
2071 const char *sname = info->secstrings + s->sh_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072
2073 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2074 || (s->sh_flags & masks[m][1])
2075 || s->sh_entsize != ~0UL
Rusty Russell49668682010-08-05 12:59:10 -06002076 || strstarts(sname, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01002078 s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
Jim Cromie5e124162011-12-06 12:11:31 -07002079 pr_debug("\t%s\n", sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002080 }
matthieu castet84e1c6b2010-11-16 22:35:16 +01002081 switch (m) {
2082 case 0: /* executable */
2083 mod->core_size = debug_align(mod->core_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 mod->core_text_size = mod->core_size;
matthieu castet84e1c6b2010-11-16 22:35:16 +01002085 break;
2086 case 1: /* RO: text and ro-data */
2087 mod->core_size = debug_align(mod->core_size);
2088 mod->core_ro_size = mod->core_size;
2089 break;
2090 case 3: /* whole core */
2091 mod->core_size = debug_align(mod->core_size);
2092 break;
2093 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 }
2095
Jim Cromie5e124162011-12-06 12:11:31 -07002096 pr_debug("Init section allocation order:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 for (m = 0; m < ARRAY_SIZE(masks); ++m) {
Rusty Russell49668682010-08-05 12:59:10 -06002098 for (i = 0; i < info->hdr->e_shnum; ++i) {
2099 Elf_Shdr *s = &info->sechdrs[i];
2100 const char *sname = info->secstrings + s->sh_name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002101
2102 if ((s->sh_flags & masks[m][0]) != masks[m][0]
2103 || (s->sh_flags & masks[m][1])
2104 || s->sh_entsize != ~0UL
Rusty Russell49668682010-08-05 12:59:10 -06002105 || !strstarts(sname, ".init"))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106 continue;
Helge Deller088af9a2008-12-31 12:31:18 +01002107 s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 | INIT_OFFSET_MASK);
Jim Cromie5e124162011-12-06 12:11:31 -07002109 pr_debug("\t%s\n", sname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002110 }
matthieu castet84e1c6b2010-11-16 22:35:16 +01002111 switch (m) {
2112 case 0: /* executable */
2113 mod->init_size = debug_align(mod->init_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 mod->init_text_size = mod->init_size;
matthieu castet84e1c6b2010-11-16 22:35:16 +01002115 break;
2116 case 1: /* RO: text and ro-data */
2117 mod->init_size = debug_align(mod->init_size);
2118 mod->init_ro_size = mod->init_size;
2119 break;
2120 case 3: /* whole init */
2121 mod->init_size = debug_align(mod->init_size);
2122 break;
2123 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002124 }
2125}
2126
Linus Torvalds1da177e2005-04-16 15:20:36 -07002127static void set_license(struct module *mod, const char *license)
2128{
2129 if (!license)
2130 license = "unspecified";
2131
Florin Malitafa3ba2e82006-10-11 01:21:48 -07002132 if (!license_is_gpl_compatible(license)) {
Andi Kleen25ddbb12008-10-15 22:01:41 -07002133 if (!test_taint(TAINT_PROPRIETARY_MODULE))
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002134 pr_warn("%s: module license '%s' taints kernel.\n",
2135 mod->name, license);
Rusty Russell373d4d02013-01-21 17:17:39 +10302136 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2137 LOCKDEP_NOW_UNRELIABLE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 }
2139}
2140
2141/* Parse tag=value strings from .modinfo section */
2142static char *next_string(char *string, unsigned long *secsize)
2143{
2144 /* Skip non-zero chars */
2145 while (string[0]) {
2146 string++;
2147 if ((*secsize)-- <= 1)
2148 return NULL;
2149 }
2150
2151 /* Skip any zero padding. */
2152 while (!string[0]) {
2153 string++;
2154 if ((*secsize)-- <= 1)
2155 return NULL;
2156 }
2157 return string;
2158}
2159
Rusty Russell49668682010-08-05 12:59:10 -06002160static char *get_modinfo(struct load_info *info, const char *tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161{
2162 char *p;
2163 unsigned int taglen = strlen(tag);
Rusty Russell49668682010-08-05 12:59:10 -06002164 Elf_Shdr *infosec = &info->sechdrs[info->index.info];
2165 unsigned long size = infosec->sh_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002166
Rusty Russell49668682010-08-05 12:59:10 -06002167 for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168 if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=')
2169 return p + taglen + 1;
2170 }
2171 return NULL;
2172}
2173
Rusty Russell49668682010-08-05 12:59:10 -06002174static void setup_modinfo(struct module *mod, struct load_info *info)
Matt Domschc988d2b2005-06-23 22:05:15 -07002175{
2176 struct module_attribute *attr;
2177 int i;
2178
2179 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2180 if (attr->setup)
Rusty Russell49668682010-08-05 12:59:10 -06002181 attr->setup(mod, get_modinfo(info, attr->attr.name));
Matt Domschc988d2b2005-06-23 22:05:15 -07002182 }
2183}
Matt Domschc988d2b2005-06-23 22:05:15 -07002184
Rusty Russella263f772009-09-25 00:32:58 -06002185static void free_modinfo(struct module *mod)
2186{
2187 struct module_attribute *attr;
2188 int i;
2189
2190 for (i = 0; (attr = modinfo_attrs[i]); i++) {
2191 if (attr->free)
2192 attr->free(mod);
2193 }
2194}
2195
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196#ifdef CONFIG_KALLSYMS
WANG Cong15bba372008-07-24 15:41:48 +01002197
2198/* lookup symbol in given range of kernel_symbols */
2199static const struct kernel_symbol *lookup_symbol(const char *name,
2200 const struct kernel_symbol *start,
2201 const struct kernel_symbol *stop)
2202{
Alessio Igor Bogani9d634872011-05-18 22:35:59 +02002203 return bsearch(name, start, stop - start,
2204 sizeof(struct kernel_symbol), cmp_name);
WANG Cong15bba372008-07-24 15:41:48 +01002205}
2206
Tim Abbottca4787b2009-01-05 08:40:10 -06002207static int is_exported(const char *name, unsigned long value,
2208 const struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209{
Tim Abbottca4787b2009-01-05 08:40:10 -06002210 const struct kernel_symbol *ks;
2211 if (!mod)
2212 ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
Sam Ravnborg3fd68052006-02-08 21:16:45 +01002213 else
Tim Abbottca4787b2009-01-05 08:40:10 -06002214 ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
2215 return ks != NULL && ks->value == value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216}
2217
2218/* As per nm */
Rusty Russelleded41c2010-08-05 12:59:07 -06002219static char elf_type(const Elf_Sym *sym, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002220{
Rusty Russelleded41c2010-08-05 12:59:07 -06002221 const Elf_Shdr *sechdrs = info->sechdrs;
2222
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223 if (ELF_ST_BIND(sym->st_info) == STB_WEAK) {
2224 if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT)
2225 return 'v';
2226 else
2227 return 'w';
2228 }
2229 if (sym->st_shndx == SHN_UNDEF)
2230 return 'U';
2231 if (sym->st_shndx == SHN_ABS)
2232 return 'a';
2233 if (sym->st_shndx >= SHN_LORESERVE)
2234 return '?';
2235 if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR)
2236 return 't';
2237 if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC
2238 && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) {
2239 if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE))
2240 return 'r';
2241 else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2242 return 'g';
2243 else
2244 return 'd';
2245 }
2246 if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) {
2247 if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL)
2248 return 's';
2249 else
2250 return 'b';
2251 }
Rusty Russelleded41c2010-08-05 12:59:07 -06002252 if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name,
2253 ".debug")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002254 return 'n';
Rusty Russelleded41c2010-08-05 12:59:07 -06002255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256 return '?';
2257}
2258
Jan Beulich4a496222009-07-06 14:50:42 +01002259static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs,
Ionut Alexa6da0b562014-11-10 09:31:29 +10302260 unsigned int shnum)
Jan Beulich4a496222009-07-06 14:50:42 +01002261{
2262 const Elf_Shdr *sec;
2263
2264 if (src->st_shndx == SHN_UNDEF
2265 || src->st_shndx >= shnum
2266 || !src->st_name)
2267 return false;
2268
2269 sec = sechdrs + src->st_shndx;
2270 if (!(sec->sh_flags & SHF_ALLOC)
2271#ifndef CONFIG_KALLSYMS_ALL
2272 || !(sec->sh_flags & SHF_EXECINSTR)
2273#endif
2274 || (sec->sh_entsize & INIT_OFFSET_MASK))
2275 return false;
2276
2277 return true;
2278}
2279
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302280/*
2281 * We only allocate and copy the strings needed by the parts of symtab
2282 * we keep. This is simple, but has the effect of making multiple
2283 * copies of duplicates. We could be more sophisticated, see
2284 * linux-kernel thread starting with
2285 * <73defb5e4bca04a6431392cc341112b1@localhost>.
2286 */
Rusty Russell49668682010-08-05 12:59:10 -06002287static void layout_symtab(struct module *mod, struct load_info *info)
Jan Beulich4a496222009-07-06 14:50:42 +01002288{
Rusty Russell49668682010-08-05 12:59:10 -06002289 Elf_Shdr *symsect = info->sechdrs + info->index.sym;
2290 Elf_Shdr *strsect = info->sechdrs + info->index.str;
Jan Beulich4a496222009-07-06 14:50:42 +01002291 const Elf_Sym *src;
Satoru Takeuchi54523ec2012-12-05 12:29:04 +10302292 unsigned int i, nsrc, ndst, strtab_size = 0;
Jan Beulich4a496222009-07-06 14:50:42 +01002293
2294 /* Put symbol section at end of init part of module. */
2295 symsect->sh_flags |= SHF_ALLOC;
2296 symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect,
Rusty Russell49668682010-08-05 12:59:10 -06002297 info->index.sym) | INIT_OFFSET_MASK;
Jim Cromie5e124162011-12-06 12:11:31 -07002298 pr_debug("\t%s\n", info->secstrings + symsect->sh_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002299
Rusty Russell49668682010-08-05 12:59:10 -06002300 src = (void *)info->hdr + symsect->sh_offset;
Jan Beulich4a496222009-07-06 14:50:42 +01002301 nsrc = symsect->sh_size / sizeof(*src);
Kevin Cernekee70b1e9162011-11-12 19:08:55 -08002302
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302303 /* Compute total space required for the core symbols' strtab. */
Rusty Russell59ef28b2012-10-25 10:49:25 +10302304 for (ndst = i = 0; i < nsrc; i++) {
2305 if (i == 0 ||
2306 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2307 strtab_size += strlen(&info->strtab[src[i].st_name])+1;
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302308 ndst++;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002309 }
Rusty Russell59ef28b2012-10-25 10:49:25 +10302310 }
Jan Beulich4a496222009-07-06 14:50:42 +01002311
2312 /* Append room for core symbols at end of core part. */
Rusty Russell49668682010-08-05 12:59:10 -06002313 info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1);
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302314 info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym);
2315 mod->core_size += strtab_size;
Laura Abbott168e47f2015-02-25 14:14:57 -08002316 mod->core_size = debug_align(mod->core_size);
Jan Beulich4a496222009-07-06 14:50:42 +01002317
Jan Beulich554bdfe2009-07-06 14:51:44 +01002318 /* Put string table section at end of init part of module. */
2319 strsect->sh_flags |= SHF_ALLOC;
2320 strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect,
Rusty Russell49668682010-08-05 12:59:10 -06002321 info->index.str) | INIT_OFFSET_MASK;
Laura Abbott168e47f2015-02-25 14:14:57 -08002322 mod->init_size = debug_align(mod->init_size);
Jim Cromie5e124162011-12-06 12:11:31 -07002323 pr_debug("\t%s\n", info->secstrings + strsect->sh_name);
Jan Beulich4a496222009-07-06 14:50:42 +01002324}
2325
Rusty Russell811d66a2010-08-05 12:59:12 -06002326static void add_kallsyms(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327{
Jan Beulich4a496222009-07-06 14:50:42 +01002328 unsigned int i, ndst;
2329 const Elf_Sym *src;
2330 Elf_Sym *dst;
Jan Beulich554bdfe2009-07-06 14:51:44 +01002331 char *s;
Rusty Russelleded41c2010-08-05 12:59:07 -06002332 Elf_Shdr *symsec = &info->sechdrs[info->index.sym];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002333
Rusty Russelleded41c2010-08-05 12:59:07 -06002334 mod->symtab = (void *)symsec->sh_addr;
2335 mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym);
Rusty Russell511ca6a2010-08-05 12:59:08 -06002336 /* Make sure we get permanent strtab: don't use info->strtab. */
2337 mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338
2339 /* Set types up while we still have access to sections. */
2340 for (i = 0; i < mod->num_symtab; i++)
Rusty Russelleded41c2010-08-05 12:59:07 -06002341 mod->symtab[i].st_info = elf_type(&mod->symtab[i], info);
Jan Beulich4a496222009-07-06 14:50:42 +01002342
Rusty Russelld9131882010-08-05 12:59:08 -06002343 mod->core_symtab = dst = mod->module_core + info->symoffs;
Kevin Cernekee48fd1182012-01-13 09:32:14 +10302344 mod->core_strtab = s = mod->module_core + info->stroffs;
Jan Beulich4a496222009-07-06 14:50:42 +01002345 src = mod->symtab;
Rusty Russell59ef28b2012-10-25 10:49:25 +10302346 for (ndst = i = 0; i < mod->num_symtab; i++) {
2347 if (i == 0 ||
2348 is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) {
2349 dst[ndst] = src[i];
2350 dst[ndst++].st_name = s - mod->core_strtab;
2351 s += strlcpy(s, &mod->strtab[src[i].st_name],
2352 KSYM_NAME_LEN) + 1;
2353 }
Jan Beulich4a496222009-07-06 14:50:42 +01002354 }
2355 mod->core_num_syms = ndst;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002356}
2357#else
Rusty Russell49668682010-08-05 12:59:10 -06002358static inline void layout_symtab(struct module *mod, struct load_info *info)
Jan Beulich4a496222009-07-06 14:50:42 +01002359{
2360}
Paul Mundt3ae91c22009-10-01 15:43:54 -07002361
Michał Mirosławabbce902010-09-20 01:58:08 +02002362static void add_kallsyms(struct module *mod, const struct load_info *info)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363{
2364}
2365#endif /* CONFIG_KALLSYMS */
2366
Jason Barone9d376f2009-02-05 11:51:38 -05002367static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num)
Rusty Russell5e458cc2008-10-22 10:00:13 -05002368{
Rusty Russell811d66a2010-08-05 12:59:12 -06002369 if (!debug)
2370 return;
Jason Barone9d376f2009-02-05 11:51:38 -05002371#ifdef CONFIG_DYNAMIC_DEBUG
2372 if (ddebug_add_module(debug, num, debug->modname))
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002373 pr_err("dynamic debug error adding module: %s\n",
2374 debug->modname);
Jason Barone9d376f2009-02-05 11:51:38 -05002375#endif
Rusty Russell5e458cc2008-10-22 10:00:13 -05002376}
Jason Baron346e15b2008-08-12 16:46:19 -04002377
Yehuda Sadehff49d742010-07-03 13:07:35 +10002378static void dynamic_debug_remove(struct _ddebug *debug)
2379{
2380 if (debug)
2381 ddebug_remove_module(debug->modname);
2382}
2383
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002384void * __weak module_alloc(unsigned long size)
2385{
Rusty Russell82fab442012-12-11 09:38:33 +10302386 return vmalloc_exec(size);
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002387}
2388
Rusty Russell3a642e92008-07-22 19:24:28 -05002389static void *module_alloc_update_bounds(unsigned long size)
2390{
2391 void *ret = module_alloc(size);
2392
2393 if (ret) {
Rusty Russell75676502010-06-05 11:17:36 -06002394 mutex_lock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002395 /* Update module bounds. */
2396 if ((unsigned long)ret < module_addr_min)
2397 module_addr_min = (unsigned long)ret;
2398 if ((unsigned long)ret + size > module_addr_max)
2399 module_addr_max = (unsigned long)ret + size;
Rusty Russell75676502010-06-05 11:17:36 -06002400 mutex_unlock(&module_mutex);
Rusty Russell3a642e92008-07-22 19:24:28 -05002401 }
2402 return ret;
2403}
2404
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002405#ifdef CONFIG_DEBUG_KMEMLEAK
Rusty Russell49668682010-08-05 12:59:10 -06002406static void kmemleak_load_module(const struct module *mod,
2407 const struct load_info *info)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002408{
2409 unsigned int i;
2410
2411 /* only scan the sections containing data */
Catalin Marinasc017b4b2009-10-28 13:33:09 +00002412 kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002413
Rusty Russell49668682010-08-05 12:59:10 -06002414 for (i = 1; i < info->hdr->e_shnum; i++) {
Steven Rostedt06c94942013-05-15 20:33:01 +01002415 /* Scan all writable sections that's not executable */
2416 if (!(info->sechdrs[i].sh_flags & SHF_ALLOC) ||
2417 !(info->sechdrs[i].sh_flags & SHF_WRITE) ||
2418 (info->sechdrs[i].sh_flags & SHF_EXECINSTR))
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002419 continue;
2420
Rusty Russell49668682010-08-05 12:59:10 -06002421 kmemleak_scan_area((void *)info->sechdrs[i].sh_addr,
2422 info->sechdrs[i].sh_size, GFP_KERNEL);
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002423 }
2424}
2425#else
Rusty Russell49668682010-08-05 12:59:10 -06002426static inline void kmemleak_load_module(const struct module *mod,
2427 const struct load_info *info)
Catalin Marinas4f2294b2009-06-11 13:23:20 +01002428{
2429}
2430#endif
2431
Rusty Russell106a4ee2012-09-26 10:09:40 +01002432#ifdef CONFIG_MODULE_SIG
Kees Cook34e11692012-10-16 07:31:07 +10302433static int module_sig_check(struct load_info *info)
Rusty Russell106a4ee2012-09-26 10:09:40 +01002434{
2435 int err = -ENOKEY;
Kees Cook34e11692012-10-16 07:31:07 +10302436 const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
2437 const void *mod = info->hdr;
Rusty Russell106a4ee2012-09-26 10:09:40 +01002438
Kees Cook34e11692012-10-16 07:31:07 +10302439 if (info->len > markerlen &&
2440 memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) {
David Howellscaabe242012-10-20 01:19:29 +01002441 /* We truncate the module to discard the signature */
Kees Cook34e11692012-10-16 07:31:07 +10302442 info->len -= markerlen;
2443 err = mod_verify_sig(mod, &info->len);
Rusty Russell106a4ee2012-09-26 10:09:40 +01002444 }
2445
2446 if (!err) {
2447 info->sig_ok = true;
2448 return 0;
2449 }
2450
2451 /* Not having a signature is only an error if we're strict. */
2452 if (err == -ENOKEY && !sig_enforce)
2453 err = 0;
2454
2455 return err;
2456}
2457#else /* !CONFIG_MODULE_SIG */
Kees Cook34e11692012-10-16 07:31:07 +10302458static int module_sig_check(struct load_info *info)
Rusty Russell106a4ee2012-09-26 10:09:40 +01002459{
2460 return 0;
2461}
2462#endif /* !CONFIG_MODULE_SIG */
2463
Kees Cook34e11692012-10-16 07:31:07 +10302464/* Sanity checks against invalid binaries, wrong arch, weird elf version. */
2465static int elf_header_check(struct load_info *info)
Rusty Russell40dd2562010-08-05 12:59:03 -06002466{
Kees Cook34e11692012-10-16 07:31:07 +10302467 if (info->len < sizeof(*(info->hdr)))
Rusty Russell40dd2562010-08-05 12:59:03 -06002468 return -ENOEXEC;
2469
Kees Cook34e11692012-10-16 07:31:07 +10302470 if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0
2471 || info->hdr->e_type != ET_REL
2472 || !elf_check_arch(info->hdr)
2473 || info->hdr->e_shentsize != sizeof(Elf_Shdr))
2474 return -ENOEXEC;
2475
2476 if (info->hdr->e_shoff >= info->len
2477 || (info->hdr->e_shnum * sizeof(Elf_Shdr) >
2478 info->len - info->hdr->e_shoff))
2479 return -ENOEXEC;
2480
2481 return 0;
2482}
2483
2484/* Sets info->hdr and info->len. */
2485static int copy_module_from_user(const void __user *umod, unsigned long len,
2486 struct load_info *info)
2487{
Kees Cook2e72d512012-10-16 07:32:07 +10302488 int err;
2489
Kees Cook34e11692012-10-16 07:31:07 +10302490 info->len = len;
2491 if (info->len < sizeof(*(info->hdr)))
Rusty Russell40dd2562010-08-05 12:59:03 -06002492 return -ENOEXEC;
2493
Kees Cook2e72d512012-10-16 07:32:07 +10302494 err = security_kernel_module_from_file(NULL);
2495 if (err)
2496 return err;
2497
Rusty Russell40dd2562010-08-05 12:59:03 -06002498 /* Suck in entire file: we'll want most of it. */
Kees Cook34e11692012-10-16 07:31:07 +10302499 info->hdr = vmalloc(info->len);
2500 if (!info->hdr)
Rusty Russell40dd2562010-08-05 12:59:03 -06002501 return -ENOMEM;
2502
Kees Cook34e11692012-10-16 07:31:07 +10302503 if (copy_from_user(info->hdr, umod, info->len) != 0) {
2504 vfree(info->hdr);
2505 return -EFAULT;
Rusty Russell40dd2562010-08-05 12:59:03 -06002506 }
2507
Rusty Russell40dd2562010-08-05 12:59:03 -06002508 return 0;
Kees Cook34e11692012-10-16 07:31:07 +10302509}
Rusty Russell40dd2562010-08-05 12:59:03 -06002510
Kees Cook34e11692012-10-16 07:31:07 +10302511/* Sets info->hdr and info->len. */
2512static int copy_module_from_fd(int fd, struct load_info *info)
2513{
Al Viroa2e05782013-08-30 12:41:41 -04002514 struct fd f = fdget(fd);
Kees Cook34e11692012-10-16 07:31:07 +10302515 int err;
2516 struct kstat stat;
2517 loff_t pos;
2518 ssize_t bytes = 0;
2519
Al Viroa2e05782013-08-30 12:41:41 -04002520 if (!f.file)
Kees Cook34e11692012-10-16 07:31:07 +10302521 return -ENOEXEC;
2522
Al Viroa2e05782013-08-30 12:41:41 -04002523 err = security_kernel_module_from_file(f.file);
Kees Cook2e72d512012-10-16 07:32:07 +10302524 if (err)
2525 goto out;
2526
Al Viroa2e05782013-08-30 12:41:41 -04002527 err = vfs_getattr(&f.file->f_path, &stat);
Kees Cook34e11692012-10-16 07:31:07 +10302528 if (err)
2529 goto out;
2530
2531 if (stat.size > INT_MAX) {
2532 err = -EFBIG;
2533 goto out;
2534 }
Sasha Levin52441fa2013-01-03 11:09:53 +10302535
2536 /* Don't hand 0 to vmalloc, it whines. */
2537 if (stat.size == 0) {
2538 err = -EINVAL;
2539 goto out;
2540 }
2541
Kees Cook34e11692012-10-16 07:31:07 +10302542 info->hdr = vmalloc(stat.size);
2543 if (!info->hdr) {
2544 err = -ENOMEM;
2545 goto out;
2546 }
2547
2548 pos = 0;
2549 while (pos < stat.size) {
Al Viroa2e05782013-08-30 12:41:41 -04002550 bytes = kernel_read(f.file, pos, (char *)(info->hdr) + pos,
Kees Cook34e11692012-10-16 07:31:07 +10302551 stat.size - pos);
2552 if (bytes < 0) {
2553 vfree(info->hdr);
2554 err = bytes;
2555 goto out;
2556 }
2557 if (bytes == 0)
2558 break;
2559 pos += bytes;
2560 }
2561 info->len = pos;
2562
2563out:
Al Viroa2e05782013-08-30 12:41:41 -04002564 fdput(f);
Rusty Russell40dd2562010-08-05 12:59:03 -06002565 return err;
2566}
2567
Rusty Russelld9131882010-08-05 12:59:08 -06002568static void free_copy(struct load_info *info)
2569{
Rusty Russelld9131882010-08-05 12:59:08 -06002570 vfree(info->hdr);
2571}
2572
Rusty Russell2f3238a2012-10-22 18:09:41 +10302573static int rewrite_section_headers(struct load_info *info, int flags)
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002574{
2575 unsigned int i;
2576
2577 /* This should always be true, but let's be sure. */
2578 info->sechdrs[0].sh_addr = 0;
2579
2580 for (i = 1; i < info->hdr->e_shnum; i++) {
2581 Elf_Shdr *shdr = &info->sechdrs[i];
2582 if (shdr->sh_type != SHT_NOBITS
2583 && info->len < shdr->sh_offset + shdr->sh_size) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002584 pr_err("Module len %lu truncated\n", info->len);
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002585 return -ENOEXEC;
2586 }
2587
2588 /* Mark all sections sh_addr with their address in the
2589 temporary image. */
2590 shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset;
2591
2592#ifndef CONFIG_MODULE_UNLOAD
2593 /* Don't load .exit sections */
2594 if (strstarts(info->secstrings+shdr->sh_name, ".exit"))
2595 shdr->sh_flags &= ~(unsigned long)SHF_ALLOC;
2596#endif
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002597 }
Rusty Russelld6df72a2010-08-05 12:59:07 -06002598
2599 /* Track but don't keep modinfo and version sections. */
Rusty Russell2f3238a2012-10-22 18:09:41 +10302600 if (flags & MODULE_INIT_IGNORE_MODVERSIONS)
2601 info->index.vers = 0; /* Pretend no __versions section! */
2602 else
2603 info->index.vers = find_sec(info, "__versions");
Rusty Russell49668682010-08-05 12:59:10 -06002604 info->index.info = find_sec(info, ".modinfo");
Rusty Russelld6df72a2010-08-05 12:59:07 -06002605 info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC;
2606 info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002607 return 0;
2608}
2609
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002610/*
2611 * Set up our basic convenience variables (pointers to section headers,
2612 * search for module section index etc), and do some basic section
2613 * verification.
2614 *
2615 * Return the temporary module pointer (we'll replace it with the final
2616 * one when we move the module sections around).
2617 */
Rusty Russell2f3238a2012-10-22 18:09:41 +10302618static struct module *setup_load_info(struct load_info *info, int flags)
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002619{
2620 unsigned int i;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002621 int err;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002622 struct module *mod;
2623
2624 /* Set up the convenience variables */
2625 info->sechdrs = (void *)info->hdr + info->hdr->e_shoff;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002626 info->secstrings = (void *)info->hdr
2627 + info->sechdrs[info->hdr->e_shstrndx].sh_offset;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002628
Rusty Russell2f3238a2012-10-22 18:09:41 +10302629 err = rewrite_section_headers(info, flags);
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002630 if (err)
2631 return ERR_PTR(err);
2632
2633 /* Find internal symbols and strings. */
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002634 for (i = 1; i < info->hdr->e_shnum; i++) {
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002635 if (info->sechdrs[i].sh_type == SHT_SYMTAB) {
2636 info->index.sym = i;
2637 info->index.str = info->sechdrs[i].sh_link;
Rusty Russell8b5f61a2010-08-05 12:59:06 -06002638 info->strtab = (char *)info->hdr
2639 + info->sechdrs[info->index.str].sh_offset;
2640 break;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002641 }
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002642 }
2643
Rusty Russell49668682010-08-05 12:59:10 -06002644 info->index.mod = find_sec(info, ".gnu.linkonce.this_module");
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002645 if (!info->index.mod) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002646 pr_warn("No module found in object\n");
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002647 return ERR_PTR(-ENOEXEC);
2648 }
2649 /* This is temporary: point mod into copy of data. */
2650 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
2651
2652 if (info->index.sym == 0) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002653 pr_warn("%s: module has no symbols (stripped?)\n", mod->name);
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002654 return ERR_PTR(-ENOEXEC);
2655 }
2656
Rusty Russell49668682010-08-05 12:59:10 -06002657 info->index.pcpu = find_pcpusec(info);
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002658
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002659 /* Check module struct version now, before we try to use module. */
2660 if (!check_modstruct_version(info->sechdrs, info->index.vers, mod))
2661 return ERR_PTR(-ENOEXEC);
2662
2663 return mod;
Linus Torvalds3264d3f2010-06-02 11:01:06 -07002664}
2665
Rusty Russell2f3238a2012-10-22 18:09:41 +10302666static int check_modinfo(struct module *mod, struct load_info *info, int flags)
Rusty Russell40dd2562010-08-05 12:59:03 -06002667{
Rusty Russell49668682010-08-05 12:59:10 -06002668 const char *modmagic = get_modinfo(info, "vermagic");
Rusty Russell40dd2562010-08-05 12:59:03 -06002669 int err;
2670
Rusty Russell2f3238a2012-10-22 18:09:41 +10302671 if (flags & MODULE_INIT_IGNORE_VERMAGIC)
2672 modmagic = NULL;
2673
Rusty Russell40dd2562010-08-05 12:59:03 -06002674 /* This is allowed: modprobe --force will invalidate it. */
2675 if (!modmagic) {
2676 err = try_to_force_load(mod, "bad vermagic");
2677 if (err)
2678 return err;
Rusty Russell49668682010-08-05 12:59:10 -06002679 } else if (!same_magic(modmagic, vermagic, info->index.vers)) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002680 pr_err("%s: version magic '%s' should be '%s'\n",
Rusty Russell40dd2562010-08-05 12:59:03 -06002681 mod->name, modmagic, vermagic);
2682 return -ENOEXEC;
2683 }
2684
Ben Hutchings2449b8b2011-10-24 15:12:28 +02002685 if (!get_modinfo(info, "intree"))
Rusty Russell373d4d02013-01-21 17:17:39 +10302686 add_taint_module(mod, TAINT_OOT_MODULE, LOCKDEP_STILL_OK);
Ben Hutchings2449b8b2011-10-24 15:12:28 +02002687
Rusty Russell49668682010-08-05 12:59:10 -06002688 if (get_modinfo(info, "staging")) {
Rusty Russell373d4d02013-01-21 17:17:39 +10302689 add_taint_module(mod, TAINT_CRAP, LOCKDEP_STILL_OK);
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002690 pr_warn("%s: module is from the staging directory, the quality "
2691 "is unknown, you have been warned.\n", mod->name);
Rusty Russell40dd2562010-08-05 12:59:03 -06002692 }
Rusty Russell22e268e2010-08-05 12:59:05 -06002693
2694 /* Set up license info based on the info section */
Rusty Russell49668682010-08-05 12:59:10 -06002695 set_license(mod, get_modinfo(info, "license"));
Rusty Russell22e268e2010-08-05 12:59:05 -06002696
Rusty Russell40dd2562010-08-05 12:59:03 -06002697 return 0;
2698}
2699
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10302700static int find_module_sections(struct module *mod, struct load_info *info)
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002701{
Rusty Russell49668682010-08-05 12:59:10 -06002702 mod->kp = section_objs(info, "__param",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002703 sizeof(*mod->kp), &mod->num_kp);
Rusty Russell49668682010-08-05 12:59:10 -06002704 mod->syms = section_objs(info, "__ksymtab",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002705 sizeof(*mod->syms), &mod->num_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002706 mod->crcs = section_addr(info, "__kcrctab");
2707 mod->gpl_syms = section_objs(info, "__ksymtab_gpl",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002708 sizeof(*mod->gpl_syms),
2709 &mod->num_gpl_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002710 mod->gpl_crcs = section_addr(info, "__kcrctab_gpl");
2711 mod->gpl_future_syms = section_objs(info,
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002712 "__ksymtab_gpl_future",
2713 sizeof(*mod->gpl_future_syms),
2714 &mod->num_gpl_future_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002715 mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future");
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002716
2717#ifdef CONFIG_UNUSED_SYMBOLS
Rusty Russell49668682010-08-05 12:59:10 -06002718 mod->unused_syms = section_objs(info, "__ksymtab_unused",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002719 sizeof(*mod->unused_syms),
2720 &mod->num_unused_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002721 mod->unused_crcs = section_addr(info, "__kcrctab_unused");
2722 mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002723 sizeof(*mod->unused_gpl_syms),
2724 &mod->num_unused_gpl_syms);
Rusty Russell49668682010-08-05 12:59:10 -06002725 mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl");
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002726#endif
2727#ifdef CONFIG_CONSTRUCTORS
Rusty Russell49668682010-08-05 12:59:10 -06002728 mod->ctors = section_objs(info, ".ctors",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002729 sizeof(*mod->ctors), &mod->num_ctors);
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10302730 if (!mod->ctors)
2731 mod->ctors = section_objs(info, ".init_array",
2732 sizeof(*mod->ctors), &mod->num_ctors);
2733 else if (find_sec(info, ".init_array")) {
2734 /*
2735 * This shouldn't happen with same compiler and binutils
2736 * building all parts of the module.
2737 */
Ionut Alexa6da0b562014-11-10 09:31:29 +10302738 pr_warn("%s: has both .ctors and .init_array.\n",
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10302739 mod->name);
2740 return -EINVAL;
2741 }
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002742#endif
2743
2744#ifdef CONFIG_TRACEPOINTS
Mathieu Desnoyers65498642011-01-26 17:26:22 -05002745 mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
2746 sizeof(*mod->tracepoints_ptrs),
2747 &mod->num_tracepoints);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002748#endif
Jason Baronbf5438fc2010-09-17 11:09:00 -04002749#ifdef HAVE_JUMP_LABEL
2750 mod->jump_entries = section_objs(info, "__jump_table",
2751 sizeof(*mod->jump_entries),
2752 &mod->num_jump_entries);
2753#endif
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002754#ifdef CONFIG_EVENT_TRACING
Rusty Russell49668682010-08-05 12:59:10 -06002755 mod->trace_events = section_objs(info, "_ftrace_events",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002756 sizeof(*mod->trace_events),
2757 &mod->num_trace_events);
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002758#endif
Steven Rostedt13b9b6e2010-11-10 22:19:24 -05002759#ifdef CONFIG_TRACING
2760 mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt",
2761 sizeof(*mod->trace_bprintk_fmt_start),
2762 &mod->num_trace_bprintk_fmt);
Steven Rostedt13b9b6e2010-11-10 22:19:24 -05002763#endif
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002764#ifdef CONFIG_FTRACE_MCOUNT_RECORD
2765 /* sechdrs[0].sh_size is always zero */
Rusty Russell49668682010-08-05 12:59:10 -06002766 mod->ftrace_callsites = section_objs(info, "__mcount_loc",
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002767 sizeof(*mod->ftrace_callsites),
2768 &mod->num_ftrace_callsites);
2769#endif
Rusty Russell22e268e2010-08-05 12:59:05 -06002770
Rusty Russell811d66a2010-08-05 12:59:12 -06002771 mod->extable = section_objs(info, "__ex_table",
2772 sizeof(*mod->extable), &mod->num_exentries);
2773
Rusty Russell49668682010-08-05 12:59:10 -06002774 if (section_addr(info, "__obsparm"))
Andrew Mortonbddb12b2013-11-12 15:11:28 -08002775 pr_warn("%s: Ignoring obsolete parameters\n", mod->name);
Rusty Russell811d66a2010-08-05 12:59:12 -06002776
2777 info->debug = section_objs(info, "__verbose",
2778 sizeof(*info->debug), &info->num_debug);
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10302779
2780 return 0;
Linus Torvaldsf91a13b2010-08-05 12:59:02 -06002781}
2782
Rusty Russell49668682010-08-05 12:59:10 -06002783static int move_module(struct module *mod, struct load_info *info)
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002784{
2785 int i;
2786 void *ptr;
2787
2788 /* Do the allocs. */
2789 ptr = module_alloc_update_bounds(mod->core_size);
2790 /*
2791 * The pointer to this block is stored in the module structure
2792 * which is inside the block. Just mark it as not being a
2793 * leak.
2794 */
2795 kmemleak_not_leak(ptr);
2796 if (!ptr)
Rusty Russelld9131882010-08-05 12:59:08 -06002797 return -ENOMEM;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002798
2799 memset(ptr, 0, mod->core_size);
2800 mod->module_core = ptr;
2801
Rusty Russell82fab442012-12-11 09:38:33 +10302802 if (mod->init_size) {
2803 ptr = module_alloc_update_bounds(mod->init_size);
2804 /*
2805 * The pointer to this block is stored in the module structure
2806 * which is inside the block. This block doesn't need to be
2807 * scanned as it contains data and code that will be freed
2808 * after the module is initialized.
2809 */
2810 kmemleak_ignore(ptr);
2811 if (!ptr) {
Rusty Russellbe1f2212015-01-20 09:07:05 +10302812 module_memfree(mod->module_core);
Rusty Russell82fab442012-12-11 09:38:33 +10302813 return -ENOMEM;
2814 }
2815 memset(ptr, 0, mod->init_size);
2816 mod->module_init = ptr;
2817 } else
2818 mod->module_init = NULL;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002819
2820 /* Transfer each section which specifies SHF_ALLOC */
Jim Cromie5e124162011-12-06 12:11:31 -07002821 pr_debug("final section addresses:\n");
Rusty Russell49668682010-08-05 12:59:10 -06002822 for (i = 0; i < info->hdr->e_shnum; i++) {
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002823 void *dest;
Rusty Russell49668682010-08-05 12:59:10 -06002824 Elf_Shdr *shdr = &info->sechdrs[i];
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002825
Rusty Russell49668682010-08-05 12:59:10 -06002826 if (!(shdr->sh_flags & SHF_ALLOC))
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002827 continue;
2828
Rusty Russell49668682010-08-05 12:59:10 -06002829 if (shdr->sh_entsize & INIT_OFFSET_MASK)
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002830 dest = mod->module_init
Rusty Russell49668682010-08-05 12:59:10 -06002831 + (shdr->sh_entsize & ~INIT_OFFSET_MASK);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002832 else
Rusty Russell49668682010-08-05 12:59:10 -06002833 dest = mod->module_core + shdr->sh_entsize;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002834
Rusty Russell49668682010-08-05 12:59:10 -06002835 if (shdr->sh_type != SHT_NOBITS)
2836 memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002837 /* Update sh_addr to point to copy in image. */
Rusty Russell49668682010-08-05 12:59:10 -06002838 shdr->sh_addr = (unsigned long)dest;
Jim Cromie5e124162011-12-06 12:11:31 -07002839 pr_debug("\t0x%lx %s\n",
2840 (long)shdr->sh_addr, info->secstrings + shdr->sh_name);
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002841 }
Rusty Russelld9131882010-08-05 12:59:08 -06002842
2843 return 0;
Linus Torvalds65b8a9b2010-08-05 12:59:02 -06002844}
2845
Rusty Russell49668682010-08-05 12:59:10 -06002846static int check_module_license_and_versions(struct module *mod)
Rusty Russell22e268e2010-08-05 12:59:05 -06002847{
2848 /*
2849 * ndiswrapper is under GPL by itself, but loads proprietary modules.
2850 * Don't use add_taint_module(), as it would prevent ndiswrapper from
2851 * using GPL-only symbols it needs.
2852 */
2853 if (strcmp(mod->name, "ndiswrapper") == 0)
Rusty Russell373d4d02013-01-21 17:17:39 +10302854 add_taint(TAINT_PROPRIETARY_MODULE, LOCKDEP_NOW_UNRELIABLE);
Rusty Russell22e268e2010-08-05 12:59:05 -06002855
2856 /* driverloader was caught wrongly pretending to be under GPL */
2857 if (strcmp(mod->name, "driverloader") == 0)
Rusty Russell373d4d02013-01-21 17:17:39 +10302858 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2859 LOCKDEP_NOW_UNRELIABLE);
Rusty Russell22e268e2010-08-05 12:59:05 -06002860
Matthew Garrettc99af372012-06-22 13:49:31 -04002861 /* lve claims to be GPL but upstream won't provide source */
2862 if (strcmp(mod->name, "lve") == 0)
Rusty Russell373d4d02013-01-21 17:17:39 +10302863 add_taint_module(mod, TAINT_PROPRIETARY_MODULE,
2864 LOCKDEP_NOW_UNRELIABLE);
Matthew Garrettc99af372012-06-22 13:49:31 -04002865
Rusty Russell22e268e2010-08-05 12:59:05 -06002866#ifdef CONFIG_MODVERSIONS
2867 if ((mod->num_syms && !mod->crcs)
2868 || (mod->num_gpl_syms && !mod->gpl_crcs)
2869 || (mod->num_gpl_future_syms && !mod->gpl_future_crcs)
2870#ifdef CONFIG_UNUSED_SYMBOLS
2871 || (mod->num_unused_syms && !mod->unused_crcs)
2872 || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs)
2873#endif
2874 ) {
2875 return try_to_force_load(mod,
2876 "no versions for exported symbols");
2877 }
2878#endif
2879 return 0;
2880}
2881
2882static void flush_module_icache(const struct module *mod)
2883{
2884 mm_segment_t old_fs;
2885
2886 /* flush the icache in correct context */
2887 old_fs = get_fs();
2888 set_fs(KERNEL_DS);
2889
2890 /*
2891 * Flush the instruction cache, since we've played with text.
2892 * Do it before processing of module parameters, so the module
2893 * can provide parameter accessor functions of its own.
2894 */
2895 if (mod->module_init)
2896 flush_icache_range((unsigned long)mod->module_init,
2897 (unsigned long)mod->module_init
2898 + mod->init_size);
2899 flush_icache_range((unsigned long)mod->module_core,
2900 (unsigned long)mod->module_core + mod->core_size);
2901
2902 set_fs(old_fs);
2903}
2904
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002905int __weak module_frob_arch_sections(Elf_Ehdr *hdr,
2906 Elf_Shdr *sechdrs,
2907 char *secstrings,
2908 struct module *mod)
2909{
2910 return 0;
2911}
2912
Rusty Russell2f3238a2012-10-22 18:09:41 +10302913static struct module *layout_and_allocate(struct load_info *info, int flags)
Rusty Russelld9131882010-08-05 12:59:08 -06002914{
2915 /* Module within temporary copy. */
2916 struct module *mod;
2917 int err;
2918
Rusty Russell2f3238a2012-10-22 18:09:41 +10302919 mod = setup_load_info(info, flags);
Rusty Russelld9131882010-08-05 12:59:08 -06002920 if (IS_ERR(mod))
2921 return mod;
2922
Rusty Russell2f3238a2012-10-22 18:09:41 +10302923 err = check_modinfo(mod, info, flags);
Rusty Russelld9131882010-08-05 12:59:08 -06002924 if (err)
2925 return ERR_PTR(err);
2926
2927 /* Allow arches to frob section contents and sizes. */
Rusty Russell49668682010-08-05 12:59:10 -06002928 err = module_frob_arch_sections(info->hdr, info->sechdrs,
2929 info->secstrings, mod);
Rusty Russelld9131882010-08-05 12:59:08 -06002930 if (err < 0)
Rusty Russell8d8022e2013-07-03 10:06:28 +09302931 return ERR_PTR(err);
Rusty Russelld9131882010-08-05 12:59:08 -06002932
Rusty Russell8d8022e2013-07-03 10:06:28 +09302933 /* We will do a special allocation for per-cpu sections later. */
2934 info->sechdrs[info->index.pcpu].sh_flags &= ~(unsigned long)SHF_ALLOC;
Rusty Russelld9131882010-08-05 12:59:08 -06002935
2936 /* Determine total sizes, and put offsets in sh_entsize. For now
2937 this is done generically; there doesn't appear to be any
2938 special cases for the architectures. */
Rusty Russell49668682010-08-05 12:59:10 -06002939 layout_sections(mod, info);
Rusty Russell49668682010-08-05 12:59:10 -06002940 layout_symtab(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002941
2942 /* Allocate and move to the final place */
Rusty Russell49668682010-08-05 12:59:10 -06002943 err = move_module(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002944 if (err)
Rusty Russell8d8022e2013-07-03 10:06:28 +09302945 return ERR_PTR(err);
Rusty Russelld9131882010-08-05 12:59:08 -06002946
2947 /* Module has been copied to its final place now: return it. */
2948 mod = (void *)info->sechdrs[info->index.mod].sh_addr;
Rusty Russell49668682010-08-05 12:59:10 -06002949 kmemleak_load_module(mod, info);
Rusty Russelld9131882010-08-05 12:59:08 -06002950 return mod;
Rusty Russelld9131882010-08-05 12:59:08 -06002951}
2952
2953/* mod is no longer valid after this! */
2954static void module_deallocate(struct module *mod, struct load_info *info)
2955{
Rusty Russelld9131882010-08-05 12:59:08 -06002956 percpu_modfree(mod);
Rusty Russelld453cde2015-01-20 09:07:04 +10302957 module_arch_freeing_init(mod);
Rusty Russellbe1f2212015-01-20 09:07:05 +10302958 module_memfree(mod->module_init);
2959 module_memfree(mod->module_core);
Rusty Russelld9131882010-08-05 12:59:08 -06002960}
2961
Jonas Bonn74e08fc2011-06-30 21:22:11 +02002962int __weak module_finalize(const Elf_Ehdr *hdr,
2963 const Elf_Shdr *sechdrs,
2964 struct module *me)
2965{
2966 return 0;
2967}
2968
Rusty Russell811d66a2010-08-05 12:59:12 -06002969static int post_relocation(struct module *mod, const struct load_info *info)
2970{
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002971 /* Sort exception table now relocations are done. */
Rusty Russell811d66a2010-08-05 12:59:12 -06002972 sort_extable(mod->extable, mod->extable + mod->num_exentries);
2973
2974 /* Copy relocated percpu area over. */
2975 percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr,
2976 info->sechdrs[info->index.pcpu].sh_size);
2977
Rusty Russell51f3d0f2010-08-05 12:59:13 -06002978 /* Setup kallsyms-specific fields. */
Rusty Russell811d66a2010-08-05 12:59:12 -06002979 add_kallsyms(mod, info);
2980
2981 /* Arch-specific module finalizing. */
2982 return module_finalize(info->hdr, info->sechdrs, mod);
2983}
2984
Rusty Russell9bb9c3b2012-09-28 14:31:03 +09302985/* Is this module of this name done loading? No locks held. */
2986static bool finished_loading(const char *name)
2987{
2988 struct module *mod;
2989 bool ret;
2990
Peter Zijlstra9cc019b2015-02-11 15:01:13 +10302991 /*
2992 * The module_mutex should not be a heavily contended lock;
2993 * if we get the occasional sleep here, we'll go an extra iteration
2994 * in the wait_event_interruptible(), which is harmless.
2995 */
2996 sched_annotate_sleep();
Rusty Russell9bb9c3b2012-09-28 14:31:03 +09302997 mutex_lock(&module_mutex);
Mathias Krause4f6de4d2013-07-02 15:35:11 +09302998 mod = find_module_all(name, strlen(name), true);
Rusty Russell0d21b0e2013-01-12 11:38:44 +10302999 ret = !mod || mod->state == MODULE_STATE_LIVE
3000 || mod->state == MODULE_STATE_GOING;
Rusty Russell9bb9c3b2012-09-28 14:31:03 +09303001 mutex_unlock(&module_mutex);
3002
3003 return ret;
3004}
3005
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07003006/* Call module constructors. */
3007static void do_mod_ctors(struct module *mod)
3008{
3009#ifdef CONFIG_CONSTRUCTORS
3010 unsigned long i;
3011
3012 for (i = 0; i < mod->num_ctors; i++)
3013 mod->ctors[i]();
3014#endif
3015}
3016
Rusty Russellc7496372015-01-20 09:07:05 +10303017/* For freeing module_init on success, in case kallsyms traversing */
3018struct mod_initfree {
3019 struct rcu_head rcu;
3020 void *module_init;
3021};
3022
3023static void do_free_init(struct rcu_head *head)
3024{
3025 struct mod_initfree *m = container_of(head, struct mod_initfree, rcu);
3026 module_memfree(m->module_init);
3027 kfree(m);
3028}
3029
Jan Kiszkabe02a182015-02-17 13:46:50 -08003030/*
3031 * This is where the real work happens.
3032 *
3033 * Keep it uninlined to provide a reliable breakpoint target, e.g. for the gdb
3034 * helper command 'lx-symbols'.
3035 */
3036static noinline int do_init_module(struct module *mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003037{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003038 int ret = 0;
Rusty Russellc7496372015-01-20 09:07:05 +10303039 struct mod_initfree *freeinit;
3040
3041 freeinit = kmalloc(sizeof(*freeinit), GFP_KERNEL);
3042 if (!freeinit) {
3043 ret = -ENOMEM;
3044 goto fail;
3045 }
3046 freeinit->module_init = mod->module_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003047
Tejun Heo774a1222013-01-15 18:52:51 -08003048 /*
3049 * We want to find out whether @mod uses async during init. Clear
3050 * PF_USED_ASYNC. async_schedule*() will set it.
3051 */
3052 current->flags &= ~PF_USED_ASYNC;
3053
Peter Oberparleiterb99b87f2009-06-17 16:28:03 -07003054 do_mod_ctors(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003055 /* Start the module */
3056 if (mod->init != NULL)
Arjan van de Ven59f94152008-07-30 12:49:02 -07003057 ret = do_one_initcall(mod->init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003058 if (ret < 0) {
Rusty Russellc7496372015-01-20 09:07:05 +10303059 goto fail_free_freeinit;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003060 }
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07003061 if (ret > 0) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08003062 pr_warn("%s: '%s'->init suspiciously returned %d, it should "
3063 "follow 0/-E convention\n"
3064 "%s: loading module anyway...\n",
3065 __func__, mod->name, ret, __func__);
Alexey Dobriyane24e2e62008-03-10 11:43:53 -07003066 dump_stack();
3067 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003068
Rusty Russell6f139092012-09-28 14:31:03 +09303069 /* Now it's a first class citizen! */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003070 mod->state = MODULE_STATE_LIVE;
Masami Hiramatsu0deddf42009-01-06 14:41:54 -08003071 blocking_notifier_call_chain(&module_notify_list,
3072 MODULE_STATE_LIVE, mod);
Rusty Russell6c5db222008-03-10 11:43:52 -07003073
Tejun Heo774a1222013-01-15 18:52:51 -08003074 /*
3075 * We need to finish all async code before the module init sequence
3076 * is done. This has potential to deadlock. For example, a newly
3077 * detected block device can trigger request_module() of the
3078 * default iosched from async probing task. Once userland helper
3079 * reaches here, async_synchronize_full() will wait on the async
3080 * task waiting on request_module() and deadlock.
3081 *
3082 * This deadlock is avoided by perfomring async_synchronize_full()
3083 * iff module init queued any async jobs. This isn't a full
3084 * solution as it will deadlock the same if module loading from
3085 * async jobs nests more than once; however, due to the various
3086 * constraints, this hack seems to be the best option for now.
3087 * Please refer to the following thread for details.
3088 *
3089 * http://thread.gmane.org/gmane.linux.kernel/1420814
3090 */
3091 if (current->flags & PF_USED_ASYNC)
3092 async_synchronize_full();
Linus Torvaldsd6de2c82009-04-10 12:17:41 -07003093
Rusty Russell6c5db222008-03-10 11:43:52 -07003094 mutex_lock(&module_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003095 /* Drop initial reference. */
3096 module_put(mod);
Rusty Russellad6561d2009-06-12 21:47:03 -06003097 trim_init_extable(mod);
Jan Beulich4a496222009-07-06 14:50:42 +01003098#ifdef CONFIG_KALLSYMS
3099 mod->num_symtab = mod->core_num_syms;
3100 mod->symtab = mod->core_symtab;
Jan Beulich554bdfe2009-07-06 14:51:44 +01003101 mod->strtab = mod->core_strtab;
Jan Beulich4a496222009-07-06 14:50:42 +01003102#endif
Jan Glauber01526ed2011-05-19 16:55:26 -06003103 unset_module_init_ro_nx(mod);
Rusty Russelld453cde2015-01-20 09:07:04 +10303104 module_arch_freeing_init(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003105 mod->module_init = NULL;
3106 mod->init_size = 0;
Jan Glauber4d103802011-05-19 16:55:25 -06003107 mod->init_ro_size = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003108 mod->init_text_size = 0;
Rusty Russellc7496372015-01-20 09:07:05 +10303109 /*
3110 * We want to free module_init, but be aware that kallsyms may be
3111 * walking this with preempt disabled. In all the failure paths,
3112 * we call synchronize_rcu/synchronize_sched, but we don't want
3113 * to slow down the success path, so use actual RCU here.
3114 */
3115 call_rcu(&freeinit->rcu, do_free_init);
Ashutosh Naik6389a382006-03-23 03:00:46 -08003116 mutex_unlock(&module_mutex);
Rusty Russell6f139092012-09-28 14:31:03 +09303117 wake_up_all(&module_wq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003118
3119 return 0;
Rusty Russellc7496372015-01-20 09:07:05 +10303120
3121fail_free_freeinit:
3122 kfree(freeinit);
3123fail:
3124 /* Try to protect us from buggy refcounters. */
3125 mod->state = MODULE_STATE_GOING;
3126 synchronize_sched();
3127 module_put(mod);
3128 blocking_notifier_call_chain(&module_notify_list,
3129 MODULE_STATE_GOING, mod);
3130 free_module(mod);
3131 wake_up_all(&module_wq);
3132 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003133}
3134
Kees Cook34e11692012-10-16 07:31:07 +10303135static int may_init_module(void)
3136{
3137 if (!capable(CAP_SYS_MODULE) || modules_disabled)
3138 return -EPERM;
3139
3140 return 0;
3141}
3142
Rusty Russella3535c72013-01-21 17:18:59 +10303143/*
3144 * We try to place it in the list now to make sure it's unique before
3145 * we dedicate too many resources. In particular, temporary percpu
3146 * memory exhaustion.
3147 */
3148static int add_unformed_module(struct module *mod)
3149{
3150 int err;
3151 struct module *old;
3152
3153 mod->state = MODULE_STATE_UNFORMED;
3154
3155again:
3156 mutex_lock(&module_mutex);
Mathias Krause4f6de4d2013-07-02 15:35:11 +09303157 old = find_module_all(mod->name, strlen(mod->name), true);
3158 if (old != NULL) {
Rusty Russella3535c72013-01-21 17:18:59 +10303159 if (old->state == MODULE_STATE_COMING
3160 || old->state == MODULE_STATE_UNFORMED) {
3161 /* Wait in case it fails to load. */
3162 mutex_unlock(&module_mutex);
Peter Zijlstra9cc019b2015-02-11 15:01:13 +10303163 err = wait_event_interruptible(module_wq,
3164 finished_loading(mod->name));
Rusty Russella3535c72013-01-21 17:18:59 +10303165 if (err)
3166 goto out_unlocked;
3167 goto again;
3168 }
3169 err = -EEXIST;
3170 goto out;
3171 }
3172 list_add_rcu(&mod->list, &modules);
3173 err = 0;
3174
3175out:
3176 mutex_unlock(&module_mutex);
3177out_unlocked:
3178 return err;
3179}
3180
3181static int complete_formation(struct module *mod, struct load_info *info)
3182{
3183 int err;
3184
3185 mutex_lock(&module_mutex);
3186
3187 /* Find duplicate symbols (must be called under lock). */
3188 err = verify_export_symbols(mod);
3189 if (err < 0)
3190 goto out;
3191
3192 /* This relies on module_mutex for list integrity. */
3193 module_bug_finalize(info->hdr, info->sechdrs, mod);
3194
Rusty Russell49822232014-05-14 10:54:19 +09303195 /* Set RO and NX regions for core */
3196 set_section_ro_nx(mod->module_core,
3197 mod->core_text_size,
3198 mod->core_ro_size,
3199 mod->core_size);
3200
3201 /* Set RO and NX regions for init */
3202 set_section_ro_nx(mod->module_init,
3203 mod->init_text_size,
3204 mod->init_ro_size,
3205 mod->init_size);
3206
Rusty Russella3535c72013-01-21 17:18:59 +10303207 /* Mark state as coming so strong_try_module_get() ignores us,
3208 * but kallsyms etc. can see us. */
3209 mod->state = MODULE_STATE_COMING;
Rusty Russell49822232014-05-14 10:54:19 +09303210 mutex_unlock(&module_mutex);
3211
3212 blocking_notifier_call_chain(&module_notify_list,
3213 MODULE_STATE_COMING, mod);
3214 return 0;
Rusty Russella3535c72013-01-21 17:18:59 +10303215
3216out:
3217 mutex_unlock(&module_mutex);
3218 return err;
3219}
3220
Rusty Russell54041d82013-07-02 15:35:12 +09303221static int unknown_module_param_cb(char *param, char *val, const char *modname)
3222{
Ionut Alexa6da0b562014-11-10 09:31:29 +10303223 /* Check for magic 'dyndbg' arg */
Rusty Russell54041d82013-07-02 15:35:12 +09303224 int ret = ddebug_dyndbg_module_param_cb(param, val, modname);
Andrew Mortonbddb12b2013-11-12 15:11:28 -08003225 if (ret != 0)
3226 pr_warn("%s: unknown parameter '%s' ignored\n", modname, param);
Rusty Russell54041d82013-07-02 15:35:12 +09303227 return 0;
3228}
3229
Kees Cook34e11692012-10-16 07:31:07 +10303230/* Allocate and load the module: note that size of section 0 is always
3231 zero, and we rely on this for optional sections. */
Rusty Russell2f3238a2012-10-22 18:09:41 +10303232static int load_module(struct load_info *info, const char __user *uargs,
3233 int flags)
Kees Cook34e11692012-10-16 07:31:07 +10303234{
Rusty Russella3535c72013-01-21 17:18:59 +10303235 struct module *mod;
Kees Cook34e11692012-10-16 07:31:07 +10303236 long err;
Rusty Russell51e158c2014-04-28 11:34:33 +09303237 char *after_dashes;
Kees Cook34e11692012-10-16 07:31:07 +10303238
3239 err = module_sig_check(info);
3240 if (err)
3241 goto free_copy;
3242
3243 err = elf_header_check(info);
3244 if (err)
3245 goto free_copy;
3246
3247 /* Figure out module layout, and allocate all the memory. */
Rusty Russell2f3238a2012-10-22 18:09:41 +10303248 mod = layout_and_allocate(info, flags);
Kees Cook34e11692012-10-16 07:31:07 +10303249 if (IS_ERR(mod)) {
3250 err = PTR_ERR(mod);
3251 goto free_copy;
3252 }
3253
Rusty Russella3535c72013-01-21 17:18:59 +10303254 /* Reserve our place in the list. */
3255 err = add_unformed_module(mod);
3256 if (err)
Rusty Russell1fb93412013-01-12 13:27:34 +10303257 goto free_module;
Rusty Russell1fb93412013-01-12 13:27:34 +10303258
Kees Cook34e11692012-10-16 07:31:07 +10303259#ifdef CONFIG_MODULE_SIG
3260 mod->sig_ok = info->sig_ok;
Rusty Russell64748a22013-01-21 17:03:02 +10303261 if (!mod->sig_ok) {
Andrew Mortonbddb12b2013-11-12 15:11:28 -08003262 pr_notice_once("%s: module verification failed: signature "
Marcel Holtmannab92ebb2015-02-06 15:09:57 +10303263 "and/or required key missing - tainting "
Andrew Mortonbddb12b2013-11-12 15:11:28 -08003264 "kernel\n", mod->name);
Mathieu Desnoyers66cc69e2014-03-13 12:11:30 +10303265 add_taint_module(mod, TAINT_UNSIGNED_MODULE, LOCKDEP_STILL_OK);
Rusty Russell64748a22013-01-21 17:03:02 +10303266 }
Kees Cook34e11692012-10-16 07:31:07 +10303267#endif
3268
Rusty Russell8d8022e2013-07-03 10:06:28 +09303269 /* To avoid stressing percpu allocator, do this once we're unique. */
Rusty Russell9eb76d72013-07-03 10:06:29 +09303270 err = percpu_modalloc(mod, info);
Rusty Russell8d8022e2013-07-03 10:06:28 +09303271 if (err)
3272 goto unlink_mod;
3273
Kees Cook34e11692012-10-16 07:31:07 +10303274 /* Now module is in final location, initialize linked lists, etc. */
3275 err = module_unload_init(mod);
3276 if (err)
Rusty Russell1fb93412013-01-12 13:27:34 +10303277 goto unlink_mod;
Kees Cook34e11692012-10-16 07:31:07 +10303278
3279 /* Now we've got everything in the final locations, we can
3280 * find optional sections. */
Frantisek Hrbataeb3057d2013-10-14 18:08:46 +10303281 err = find_module_sections(mod, info);
3282 if (err)
3283 goto free_unload;
Kees Cook34e11692012-10-16 07:31:07 +10303284
3285 err = check_module_license_and_versions(mod);
3286 if (err)
3287 goto free_unload;
3288
3289 /* Set up MODINFO_ATTR fields */
3290 setup_modinfo(mod, info);
3291
3292 /* Fix up syms, so that st_value is a pointer to location. */
3293 err = simplify_symbols(mod, info);
3294 if (err < 0)
3295 goto free_modinfo;
3296
3297 err = apply_relocations(mod, info);
3298 if (err < 0)
3299 goto free_modinfo;
3300
3301 err = post_relocation(mod, info);
3302 if (err < 0)
3303 goto free_modinfo;
3304
3305 flush_module_icache(mod);
3306
3307 /* Now copy in args */
3308 mod->args = strndup_user(uargs, ~0UL >> 1);
3309 if (IS_ERR(mod->args)) {
3310 err = PTR_ERR(mod->args);
3311 goto free_arch_cleanup;
3312 }
3313
Kees Cook34e11692012-10-16 07:31:07 +10303314 dynamic_debug_setup(info->debug, info->num_debug);
3315
Steven Rostedt (Red Hat)a949ae52014-04-24 10:40:12 -04003316 /* Ftrace init must be called in the MODULE_STATE_UNFORMED state */
3317 ftrace_module_init(mod);
3318
Rusty Russella3535c72013-01-21 17:18:59 +10303319 /* Finally it's fully formed, ready to start executing. */
3320 err = complete_formation(mod, info);
3321 if (err)
Rusty Russell1fb93412013-01-12 13:27:34 +10303322 goto ddebug_cleanup;
Kees Cook34e11692012-10-16 07:31:07 +10303323
Kees Cook34e11692012-10-16 07:31:07 +10303324 /* Module is ready to execute: parsing args may do that. */
Rusty Russell51e158c2014-04-28 11:34:33 +09303325 after_dashes = parse_args(mod->name, mod->args, mod->kp, mod->num_kp,
3326 -32768, 32767, unknown_module_param_cb);
3327 if (IS_ERR(after_dashes)) {
3328 err = PTR_ERR(after_dashes);
Rusty Russell1fb93412013-01-12 13:27:34 +10303329 goto bug_cleanup;
Rusty Russell51e158c2014-04-28 11:34:33 +09303330 } else if (after_dashes) {
3331 pr_warn("%s: parameters '%s' after `--' ignored\n",
3332 mod->name, after_dashes);
3333 }
Kees Cook34e11692012-10-16 07:31:07 +10303334
3335 /* Link in to syfs. */
3336 err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp);
3337 if (err < 0)
Rusty Russell1fb93412013-01-12 13:27:34 +10303338 goto bug_cleanup;
Kees Cook34e11692012-10-16 07:31:07 +10303339
3340 /* Get rid of temporary copy. */
3341 free_copy(info);
3342
3343 /* Done! */
3344 trace_module_load(mod);
3345
3346 return do_init_module(mod);
3347
Rusty Russell1fb93412013-01-12 13:27:34 +10303348 bug_cleanup:
3349 /* module_bug_cleanup needs module_mutex protection */
Kees Cook34e11692012-10-16 07:31:07 +10303350 mutex_lock(&module_mutex);
Kees Cook34e11692012-10-16 07:31:07 +10303351 module_bug_cleanup(mod);
Linus Torvaldsee61abb2013-01-20 20:22:58 -08003352 mutex_unlock(&module_mutex);
Andy Lutomirskiff7e0052014-08-16 04:13:37 +09303353
Andrey Tsyvarevde96d792015-02-06 15:09:57 +10303354 /* Free lock-classes: */
3355 lockdep_free_key_range(mod->module_core, mod->core_size);
3356
Andy Lutomirskiff7e0052014-08-16 04:13:37 +09303357 /* we can't deallocate the module until we clear memory protection */
3358 unset_module_init_ro_nx(mod);
3359 unset_module_core_ro_nx(mod);
3360
Rusty Russella3535c72013-01-21 17:18:59 +10303361 ddebug_cleanup:
Rusty Russell1fb93412013-01-12 13:27:34 +10303362 dynamic_debug_remove(info->debug);
Kees Cook34e11692012-10-16 07:31:07 +10303363 synchronize_sched();
3364 kfree(mod->args);
3365 free_arch_cleanup:
3366 module_arch_cleanup(mod);
3367 free_modinfo:
3368 free_modinfo(mod);
3369 free_unload:
3370 module_unload_free(mod);
Rusty Russell1fb93412013-01-12 13:27:34 +10303371 unlink_mod:
3372 mutex_lock(&module_mutex);
3373 /* Unlink carefully: kallsyms could be walking list. */
3374 list_del_rcu(&mod->list);
3375 wake_up_all(&module_wq);
Masami Hiramatsu4f487952014-11-10 09:26:29 +10303376 /* Wait for RCU synchronizing before releasing mod->list. */
3377 synchronize_rcu();
Rusty Russell1fb93412013-01-12 13:27:34 +10303378 mutex_unlock(&module_mutex);
Kees Cook34e11692012-10-16 07:31:07 +10303379 free_module:
3380 module_deallocate(mod, info);
3381 free_copy:
3382 free_copy(info);
3383 return err;
3384}
3385
3386SYSCALL_DEFINE3(init_module, void __user *, umod,
3387 unsigned long, len, const char __user *, uargs)
3388{
3389 int err;
3390 struct load_info info = { };
3391
3392 err = may_init_module();
3393 if (err)
3394 return err;
3395
3396 pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n",
3397 umod, len, uargs);
3398
3399 err = copy_module_from_user(umod, len, &info);
3400 if (err)
3401 return err;
3402
Rusty Russell2f3238a2012-10-22 18:09:41 +10303403 return load_module(&info, uargs, 0);
Kees Cook34e11692012-10-16 07:31:07 +10303404}
3405
Rusty Russell2f3238a2012-10-22 18:09:41 +10303406SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
Kees Cook34e11692012-10-16 07:31:07 +10303407{
3408 int err;
3409 struct load_info info = { };
3410
3411 err = may_init_module();
3412 if (err)
3413 return err;
3414
Rusty Russell2f3238a2012-10-22 18:09:41 +10303415 pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags);
3416
3417 if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS
3418 |MODULE_INIT_IGNORE_VERMAGIC))
3419 return -EINVAL;
Kees Cook34e11692012-10-16 07:31:07 +10303420
3421 err = copy_module_from_fd(fd, &info);
3422 if (err)
3423 return err;
3424
Rusty Russell2f3238a2012-10-22 18:09:41 +10303425 return load_module(&info, uargs, flags);
Kees Cook34e11692012-10-16 07:31:07 +10303426}
3427
Linus Torvalds1da177e2005-04-16 15:20:36 -07003428static inline int within(unsigned long addr, void *start, unsigned long size)
3429{
3430 return ((void *)addr >= start && (void *)addr < start + size);
3431}
3432
3433#ifdef CONFIG_KALLSYMS
3434/*
3435 * This ignores the intensely annoying "mapping symbols" found
3436 * in ARM ELF files: $a, $t and $d.
3437 */
3438static inline int is_arm_mapping_symbol(const char *str)
3439{
Russell King2e3a10a2014-07-27 07:29:01 +09303440 if (str[0] == '.' && str[1] == 'L')
3441 return true;
Kyle McMartin6c34f1f2014-09-16 22:37:18 +01003442 return str[0] == '$' && strchr("axtd", str[1])
Linus Torvalds1da177e2005-04-16 15:20:36 -07003443 && (str[2] == '\0' || str[2] == '.');
3444}
3445
3446static const char *get_ksymbol(struct module *mod,
3447 unsigned long addr,
3448 unsigned long *size,
3449 unsigned long *offset)
3450{
3451 unsigned int i, best = 0;
3452 unsigned long nextval;
3453
3454 /* At worse, next value is at end of module */
Masami Hiramatsua06f6212009-01-06 14:41:49 -08003455 if (within_module_init(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003456 nextval = (unsigned long)mod->module_init+mod->init_text_size;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003457 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07003458 nextval = (unsigned long)mod->module_core+mod->core_text_size;
3459
Lucas De Marchi25985ed2011-03-30 22:57:33 -03003460 /* Scan for closest preceding symbol, and next symbol. (ELF
Daniel Walker22a8bde2007-10-18 03:06:07 -07003461 starts real symbols at 1). */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003462 for (i = 1; i < mod->num_symtab; i++) {
3463 if (mod->symtab[i].st_shndx == SHN_UNDEF)
3464 continue;
3465
3466 /* We ignore unnamed symbols: they're uninformative
3467 * and inserted at a whim. */
3468 if (mod->symtab[i].st_value <= addr
3469 && mod->symtab[i].st_value > mod->symtab[best].st_value
3470 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3471 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3472 best = i;
3473 if (mod->symtab[i].st_value > addr
3474 && mod->symtab[i].st_value < nextval
3475 && *(mod->strtab + mod->symtab[i].st_name) != '\0'
3476 && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name))
3477 nextval = mod->symtab[i].st_value;
3478 }
3479
3480 if (!best)
3481 return NULL;
3482
Alexey Dobriyanffb45122007-05-08 00:28:41 -07003483 if (size)
3484 *size = nextval - mod->symtab[best].st_value;
3485 if (offset)
3486 *offset = addr - mod->symtab[best].st_value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003487 return mod->strtab + mod->symtab[best].st_name;
3488}
3489
Rusty Russell6dd06c92008-01-29 17:13:22 -05003490/* For kallsyms to ask for address resolution. NULL means not found. Careful
3491 * not to lock to avoid deadlock on oopses, simply disable preemption. */
Andrew Morton92dfc9d2008-02-08 04:18:43 -08003492const char *module_address_lookup(unsigned long addr,
Rusty Russell6dd06c92008-01-29 17:13:22 -05003493 unsigned long *size,
3494 unsigned long *offset,
3495 char **modname,
3496 char *namebuf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003497{
3498 struct module *mod;
Rusty Russellcb2a5202008-01-14 00:55:03 -08003499 const char *ret = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003500
Rusty Russellcb2a5202008-01-14 00:55:03 -08003501 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003502 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303503 if (mod->state == MODULE_STATE_UNFORMED)
3504 continue;
Petr Mladek9b20a352014-07-27 07:24:01 +09303505 if (within_module(addr, mod)) {
Franck Bui-Huuffc50892006-10-03 01:13:48 -07003506 if (modname)
3507 *modname = mod->name;
Rusty Russellcb2a5202008-01-14 00:55:03 -08003508 ret = get_ksymbol(mod, addr, size, offset);
3509 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003510 }
3511 }
Rusty Russell6dd06c92008-01-29 17:13:22 -05003512 /* Make a copy in here where it's safe */
3513 if (ret) {
3514 strncpy(namebuf, ret, KSYM_NAME_LEN - 1);
3515 ret = namebuf;
3516 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003517 preempt_enable();
Andrew Morton92dfc9d2008-02-08 04:18:43 -08003518 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003519}
3520
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003521int lookup_module_symbol_name(unsigned long addr, char *symname)
3522{
3523 struct module *mod;
3524
Rusty Russellcb2a5202008-01-14 00:55:03 -08003525 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003526 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303527 if (mod->state == MODULE_STATE_UNFORMED)
3528 continue;
Petr Mladek9b20a352014-07-27 07:24:01 +09303529 if (within_module(addr, mod)) {
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003530 const char *sym;
3531
3532 sym = get_ksymbol(mod, addr, NULL, NULL);
3533 if (!sym)
3534 goto out;
Tejun Heo9281ace2007-07-17 04:03:51 -07003535 strlcpy(symname, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003536 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003537 return 0;
3538 }
3539 }
3540out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08003541 preempt_enable();
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -07003542 return -ERANGE;
3543}
3544
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003545int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size,
3546 unsigned long *offset, char *modname, char *name)
3547{
3548 struct module *mod;
3549
Rusty Russellcb2a5202008-01-14 00:55:03 -08003550 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003551 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303552 if (mod->state == MODULE_STATE_UNFORMED)
3553 continue;
Petr Mladek9b20a352014-07-27 07:24:01 +09303554 if (within_module(addr, mod)) {
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003555 const char *sym;
3556
3557 sym = get_ksymbol(mod, addr, size, offset);
3558 if (!sym)
3559 goto out;
3560 if (modname)
Tejun Heo9281ace2007-07-17 04:03:51 -07003561 strlcpy(modname, mod->name, MODULE_NAME_LEN);
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003562 if (name)
Tejun Heo9281ace2007-07-17 04:03:51 -07003563 strlcpy(name, sym, KSYM_NAME_LEN);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003564 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003565 return 0;
3566 }
3567 }
3568out:
Rusty Russellcb2a5202008-01-14 00:55:03 -08003569 preempt_enable();
Alexey Dobriyana5c43da2007-05-08 00:28:47 -07003570 return -ERANGE;
3571}
3572
Alexey Dobriyanea078902007-05-08 00:28:39 -07003573int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
3574 char *name, char *module_name, int *exported)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003575{
3576 struct module *mod;
3577
Rusty Russellcb2a5202008-01-14 00:55:03 -08003578 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003579 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303580 if (mod->state == MODULE_STATE_UNFORMED)
3581 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003582 if (symnum < mod->num_symtab) {
3583 *value = mod->symtab[symnum].st_value;
3584 *type = mod->symtab[symnum].st_info;
Andreas Gruenbacher098c5ee2006-07-14 00:24:04 -07003585 strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
Tejun Heo9281ace2007-07-17 04:03:51 -07003586 KSYM_NAME_LEN);
3587 strlcpy(module_name, mod->name, MODULE_NAME_LEN);
Tim Abbottca4787b2009-01-05 08:40:10 -06003588 *exported = is_exported(name, *value, mod);
Rusty Russellcb2a5202008-01-14 00:55:03 -08003589 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07003590 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003591 }
3592 symnum -= mod->num_symtab;
3593 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003594 preempt_enable();
Alexey Dobriyanea078902007-05-08 00:28:39 -07003595 return -ERANGE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003596}
3597
3598static unsigned long mod_find_symname(struct module *mod, const char *name)
3599{
3600 unsigned int i;
3601
3602 for (i = 0; i < mod->num_symtab; i++)
Keith Owens54e8ce42006-02-03 03:03:53 -08003603 if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 &&
3604 mod->symtab[i].st_info != 'U')
Linus Torvalds1da177e2005-04-16 15:20:36 -07003605 return mod->symtab[i].st_value;
3606 return 0;
3607}
3608
3609/* Look for this name: can be of form module:name. */
3610unsigned long module_kallsyms_lookup_name(const char *name)
3611{
3612 struct module *mod;
3613 char *colon;
3614 unsigned long ret = 0;
3615
3616 /* Don't lock: we're in enough trouble already. */
Rusty Russellcb2a5202008-01-14 00:55:03 -08003617 preempt_disable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003618 if ((colon = strchr(name, ':')) != NULL) {
Mathias Krause4f6de4d2013-07-02 15:35:11 +09303619 if ((mod = find_module_all(name, colon - name, false)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003620 ret = mod_find_symname(mod, colon+1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003621 } else {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303622 list_for_each_entry_rcu(mod, &modules, list) {
3623 if (mod->state == MODULE_STATE_UNFORMED)
3624 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003625 if ((ret = mod_find_symname(mod, name)) != 0)
3626 break;
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303627 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003628 }
Rusty Russellcb2a5202008-01-14 00:55:03 -08003629 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003630 return ret;
3631}
Anders Kaseorg75a66612008-12-05 19:03:58 -05003632
3633int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *,
3634 struct module *, unsigned long),
3635 void *data)
3636{
3637 struct module *mod;
3638 unsigned int i;
3639 int ret;
3640
3641 list_for_each_entry(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303642 if (mod->state == MODULE_STATE_UNFORMED)
3643 continue;
Anders Kaseorg75a66612008-12-05 19:03:58 -05003644 for (i = 0; i < mod->num_symtab; i++) {
3645 ret = fn(data, mod->strtab + mod->symtab[i].st_name,
3646 mod, mod->symtab[i].st_value);
3647 if (ret != 0)
3648 return ret;
3649 }
3650 }
3651 return 0;
3652}
Linus Torvalds1da177e2005-04-16 15:20:36 -07003653#endif /* CONFIG_KALLSYMS */
3654
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003655static char *module_flags(struct module *mod, char *buf)
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003656{
3657 int bx = 0;
3658
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303659 BUG_ON(mod->state == MODULE_STATE_UNFORMED);
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003660 if (mod->taints ||
3661 mod->state == MODULE_STATE_GOING ||
3662 mod->state == MODULE_STATE_COMING) {
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003663 buf[bx++] = '(';
Kay Sieverscca3e702012-01-13 09:32:15 +10303664 bx += module_flags_taint(mod, buf + bx);
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003665 /* Show a - for module-is-being-unloaded */
3666 if (mod->state == MODULE_STATE_GOING)
3667 buf[bx++] = '-';
3668 /* Show a + for module-is-being-loaded */
3669 if (mod->state == MODULE_STATE_COMING)
3670 buf[bx++] = '+';
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003671 buf[bx++] = ')';
3672 }
3673 buf[bx] = '\0';
3674
3675 return buf;
3676}
3677
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003678#ifdef CONFIG_PROC_FS
3679/* Called by the /proc file system to return a list of modules. */
3680static void *m_start(struct seq_file *m, loff_t *pos)
3681{
3682 mutex_lock(&module_mutex);
3683 return seq_list_start(&modules, *pos);
3684}
3685
3686static void *m_next(struct seq_file *m, void *p, loff_t *pos)
3687{
3688 return seq_list_next(p, &modules, pos);
3689}
3690
3691static void m_stop(struct seq_file *m, void *p)
3692{
3693 mutex_unlock(&module_mutex);
3694}
3695
Linus Torvalds1da177e2005-04-16 15:20:36 -07003696static int m_show(struct seq_file *m, void *p)
3697{
3698 struct module *mod = list_entry(p, struct module, list);
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003699 char buf[8];
3700
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303701 /* We always ignore unformed modules. */
3702 if (mod->state == MODULE_STATE_UNFORMED)
3703 return 0;
3704
Denys Vlasenko2f0f2a32008-07-22 19:24:27 -05003705 seq_printf(m, "%s %u",
Linus Torvalds1da177e2005-04-16 15:20:36 -07003706 mod->name, mod->init_size + mod->core_size);
3707 print_unload_info(m, mod);
3708
3709 /* Informative for users. */
3710 seq_printf(m, " %s",
Ionut Alexa6da0b562014-11-10 09:31:29 +10303711 mod->state == MODULE_STATE_GOING ? "Unloading" :
3712 mod->state == MODULE_STATE_COMING ? "Loading" :
Linus Torvalds1da177e2005-04-16 15:20:36 -07003713 "Live");
3714 /* Used by oprofile and other similar tools. */
Kees Cook9f36e2c2011-03-22 16:34:22 -07003715 seq_printf(m, " 0x%pK", mod->module_core);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003716
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003717 /* Taints info */
3718 if (mod->taints)
Arjan van de Ven21aa9282008-01-25 21:08:33 +01003719 seq_printf(m, " %s", module_flags(mod, buf));
Florin Malitafa3ba2e82006-10-11 01:21:48 -07003720
Ionut Alexa6da0b562014-11-10 09:31:29 +10303721 seq_puts(m, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003722 return 0;
3723}
3724
3725/* Format: modulename size refcount deps address
3726
3727 Where refcount is a number or -, and deps is a comma-separated list
3728 of depends or -.
3729*/
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003730static const struct seq_operations modules_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003731 .start = m_start,
3732 .next = m_next,
3733 .stop = m_stop,
3734 .show = m_show
3735};
3736
Alexey Dobriyan3b5d5c62008-10-06 13:19:27 +04003737static int modules_open(struct inode *inode, struct file *file)
3738{
3739 return seq_open(file, &modules_op);
3740}
3741
3742static const struct file_operations proc_modules_operations = {
3743 .open = modules_open,
3744 .read = seq_read,
3745 .llseek = seq_lseek,
3746 .release = seq_release,
3747};
3748
3749static int __init proc_modules_init(void)
3750{
3751 proc_create("modules", 0, NULL, &proc_modules_operations);
3752 return 0;
3753}
3754module_init(proc_modules_init);
3755#endif
3756
Linus Torvalds1da177e2005-04-16 15:20:36 -07003757/* Given an address, look for it in the module exception tables. */
3758const struct exception_table_entry *search_module_extables(unsigned long addr)
3759{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003760 const struct exception_table_entry *e = NULL;
3761 struct module *mod;
3762
Rusty Russell24da1cb2007-07-15 23:41:46 -07003763 preempt_disable();
Andi Kleend72b3752008-08-30 10:09:00 +02003764 list_for_each_entry_rcu(mod, &modules, list) {
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303765 if (mod->state == MODULE_STATE_UNFORMED)
3766 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003767 if (mod->num_exentries == 0)
3768 continue;
Daniel Walker22a8bde2007-10-18 03:06:07 -07003769
Linus Torvalds1da177e2005-04-16 15:20:36 -07003770 e = search_extable(mod->extable,
3771 mod->extable + mod->num_exentries - 1,
3772 addr);
3773 if (e)
3774 break;
3775 }
Rusty Russell24da1cb2007-07-15 23:41:46 -07003776 preempt_enable();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003777
3778 /* Now, if we found one, we are running inside it now, hence
Daniel Walker22a8bde2007-10-18 03:06:07 -07003779 we cannot unload the module, hence no refcnt needed. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003780 return e;
3781}
3782
Ingo Molnar4d435f92006-07-03 00:24:24 -07003783/*
Rusty Russelle6104992009-03-31 13:05:31 -06003784 * is_module_address - is this address inside a module?
3785 * @addr: the address to check.
3786 *
3787 * See is_module_text_address() if you simply want to see if the address
3788 * is code (not data).
Ingo Molnar4d435f92006-07-03 00:24:24 -07003789 */
Rusty Russelle6104992009-03-31 13:05:31 -06003790bool is_module_address(unsigned long addr)
Ingo Molnar4d435f92006-07-03 00:24:24 -07003791{
Rusty Russelle6104992009-03-31 13:05:31 -06003792 bool ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003793
Rusty Russell24da1cb2007-07-15 23:41:46 -07003794 preempt_disable();
Rusty Russelle6104992009-03-31 13:05:31 -06003795 ret = __module_address(addr) != NULL;
Rusty Russell24da1cb2007-07-15 23:41:46 -07003796 preempt_enable();
Ingo Molnar4d435f92006-07-03 00:24:24 -07003797
Rusty Russelle6104992009-03-31 13:05:31 -06003798 return ret;
Ingo Molnar4d435f92006-07-03 00:24:24 -07003799}
3800
Rusty Russelle6104992009-03-31 13:05:31 -06003801/*
3802 * __module_address - get the module which contains an address.
3803 * @addr: the address.
3804 *
3805 * Must be called with preempt disabled or module mutex held so that
3806 * module doesn't get freed during this.
3807 */
Linus Torvalds714f83d2009-04-05 11:04:19 -07003808struct module *__module_address(unsigned long addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003809{
3810 struct module *mod;
3811
Rusty Russell3a642e92008-07-22 19:24:28 -05003812 if (addr < module_addr_min || addr > module_addr_max)
3813 return NULL;
3814
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303815 list_for_each_entry_rcu(mod, &modules, list) {
3816 if (mod->state == MODULE_STATE_UNFORMED)
3817 continue;
Petr Mladek9b20a352014-07-27 07:24:01 +09303818 if (within_module(addr, mod))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003819 return mod;
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303820 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003821 return NULL;
3822}
Tim Abbottc6b37802008-12-05 19:03:59 -05003823EXPORT_SYMBOL_GPL(__module_address);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003824
Rusty Russelle6104992009-03-31 13:05:31 -06003825/*
3826 * is_module_text_address - is this address inside module code?
3827 * @addr: the address to check.
3828 *
3829 * See is_module_address() if you simply want to see if the address is
3830 * anywhere in a module. See kernel_text_address() for testing if an
3831 * address corresponds to kernel or module code.
3832 */
3833bool is_module_text_address(unsigned long addr)
3834{
3835 bool ret;
3836
3837 preempt_disable();
3838 ret = __module_text_address(addr) != NULL;
3839 preempt_enable();
3840
3841 return ret;
3842}
3843
3844/*
3845 * __module_text_address - get the module whose code contains an address.
3846 * @addr: the address.
3847 *
3848 * Must be called with preempt disabled or module mutex held so that
3849 * module doesn't get freed during this.
3850 */
3851struct module *__module_text_address(unsigned long addr)
3852{
3853 struct module *mod = __module_address(addr);
3854 if (mod) {
3855 /* Make sure it's within the text section. */
3856 if (!within(addr, mod->module_init, mod->init_text_size)
3857 && !within(addr, mod->module_core, mod->core_text_size))
3858 mod = NULL;
3859 }
3860 return mod;
3861}
Tim Abbottc6b37802008-12-05 19:03:59 -05003862EXPORT_SYMBOL_GPL(__module_text_address);
Rusty Russelle6104992009-03-31 13:05:31 -06003863
Linus Torvalds1da177e2005-04-16 15:20:36 -07003864/* Don't grab lock, we're oopsing. */
3865void print_modules(void)
3866{
3867 struct module *mod;
Randy Dunlap2bc2d612006-10-02 02:17:02 -07003868 char buf[8];
Linus Torvalds1da177e2005-04-16 15:20:36 -07003869
Linus Torvaldsb2311252009-06-16 11:07:14 -07003870 printk(KERN_DEFAULT "Modules linked in:");
Andi Kleend72b3752008-08-30 10:09:00 +02003871 /* Most callers should already have preempt disabled, but make sure */
3872 preempt_disable();
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303873 list_for_each_entry_rcu(mod, &modules, list) {
3874 if (mod->state == MODULE_STATE_UNFORMED)
3875 continue;
Jiri Slaby27bba4d2014-02-03 11:13:13 +10303876 pr_cont(" %s%s", mod->name, module_flags(mod, buf));
Rusty Russell0d21b0e2013-01-12 11:38:44 +10303877 }
Andi Kleend72b3752008-08-30 10:09:00 +02003878 preempt_enable();
Arjan van de Vene14af7e2008-01-25 21:08:33 +01003879 if (last_unloaded_module[0])
Jiri Slaby27bba4d2014-02-03 11:13:13 +10303880 pr_cont(" [last unloaded: %s]", last_unloaded_module);
3881 pr_cont("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003882}
3883
Linus Torvalds1da177e2005-04-16 15:20:36 -07003884#ifdef CONFIG_MODVERSIONS
Rusty Russell8c8ef422009-03-31 13:05:34 -06003885/* Generate the signature for all relevant module structures here.
3886 * If these change, we don't want to try to parse the module. */
3887void module_layout(struct module *mod,
3888 struct modversion_info *ver,
3889 struct kernel_param *kp,
3890 struct kernel_symbol *ks,
Mathieu Desnoyers65498642011-01-26 17:26:22 -05003891 struct tracepoint * const *tp)
Rusty Russell8c8ef422009-03-31 13:05:34 -06003892{
3893}
3894EXPORT_SYMBOL(module_layout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003895#endif