sysctl: Remove references to ctl_name and strategy from the generic sysctl table
[linux-2.6.git] / kernel / sysctl.c
1 /*
2  * sysctl.c: General linux system control interface
3  *
4  * Begun 24 March 1995, Stephen Tweedie
5  * Added /proc support, Dec 1995
6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9  * Dynamic registration fixes, Stephen Tweedie.
10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12  *  Horn.
13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16  *  Wendling.
17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
19  */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/kmemcheck.h>
30 #include <linux/fs.h>
31 #include <linux/init.h>
32 #include <linux/kernel.h>
33 #include <linux/kobject.h>
34 #include <linux/net.h>
35 #include <linux/sysrq.h>
36 #include <linux/highuid.h>
37 #include <linux/writeback.h>
38 #include <linux/hugetlb.h>
39 #include <linux/initrd.h>
40 #include <linux/key.h>
41 #include <linux/times.h>
42 #include <linux/limits.h>
43 #include <linux/dcache.h>
44 #include <linux/syscalls.h>
45 #include <linux/vmstat.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
48 #include <linux/reboot.h>
49 #include <linux/ftrace.h>
50 #include <linux/slow-work.h>
51 #include <linux/perf_event.h>
52
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
55
56 #ifdef CONFIG_X86
57 #include <asm/nmi.h>
58 #include <asm/stacktrace.h>
59 #include <asm/io.h>
60 #endif
61
62
63 #if defined(CONFIG_SYSCTL)
64
65 /* External variables not in a header file. */
66 extern int C_A_D;
67 extern int print_fatal_signals;
68 extern int sysctl_overcommit_memory;
69 extern int sysctl_overcommit_ratio;
70 extern int sysctl_panic_on_oom;
71 extern int sysctl_oom_kill_allocating_task;
72 extern int sysctl_oom_dump_tasks;
73 extern int max_threads;
74 extern int core_uses_pid;
75 extern int suid_dumpable;
76 extern char core_pattern[];
77 extern unsigned int core_pipe_limit;
78 extern int pid_max;
79 extern int min_free_kbytes;
80 extern int pid_max_min, pid_max_max;
81 extern int sysctl_drop_caches;
82 extern int percpu_pagelist_fraction;
83 extern int compat_log;
84 extern int latencytop_enabled;
85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
86 #ifndef CONFIG_MMU
87 extern int sysctl_nr_trim_pages;
88 #endif
89 #ifdef CONFIG_RCU_TORTURE_TEST
90 extern int rcutorture_runnable;
91 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
92 #ifdef CONFIG_BLOCK
93 extern int blk_iopoll_enabled;
94 #endif
95
96 /* Constants used for minimum and  maximum */
97 #ifdef CONFIG_DETECT_SOFTLOCKUP
98 static int sixty = 60;
99 static int neg_one = -1;
100 #endif
101
102 static int zero;
103 static int __maybe_unused one = 1;
104 static int __maybe_unused two = 2;
105 static unsigned long one_ul = 1;
106 static int one_hundred = 100;
107 #ifdef CONFIG_PRINTK
108 static int ten_thousand = 10000;
109 #endif
110
111 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
112 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
113
114 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
115 static int maxolduid = 65535;
116 static int minolduid;
117 static int min_percpu_pagelist_fract = 8;
118
119 static int ngroups_max = NGROUPS_MAX;
120
121 #ifdef CONFIG_MODULES
122 extern char modprobe_path[];
123 extern int modules_disabled;
124 #endif
125 #ifdef CONFIG_CHR_DEV_SG
126 extern int sg_big_buff;
127 #endif
128
129 #ifdef CONFIG_SPARC
130 #include <asm/system.h>
131 #endif
132
133 #ifdef CONFIG_SPARC64
134 extern int sysctl_tsb_ratio;
135 #endif
136
137 #ifdef __hppa__
138 extern int pwrsw_enabled;
139 extern int unaligned_enabled;
140 #endif
141
142 #ifdef CONFIG_S390
143 #ifdef CONFIG_MATHEMU
144 extern int sysctl_ieee_emulation_warnings;
145 #endif
146 extern int sysctl_userprocess_debug;
147 extern int spin_retry;
148 #endif
149
150 #ifdef CONFIG_BSD_PROCESS_ACCT
151 extern int acct_parm[];
152 #endif
153
154 #ifdef CONFIG_IA64
155 extern int no_unaligned_warning;
156 extern int unaligned_dump_stack;
157 #endif
158
159 #ifdef CONFIG_RT_MUTEXES
160 extern int max_lock_depth;
161 #endif
162
163 #ifdef CONFIG_PROC_SYSCTL
164 static int proc_do_cad_pid(struct ctl_table *table, int write,
165                   void __user *buffer, size_t *lenp, loff_t *ppos);
166 static int proc_taint(struct ctl_table *table, int write,
167                                void __user *buffer, size_t *lenp, loff_t *ppos);
168 #endif
169
170 static struct ctl_table root_table[];
171 static struct ctl_table_root sysctl_table_root;
172 static struct ctl_table_header root_table_header = {
173         .count = 1,
174         .ctl_table = root_table,
175         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
176         .root = &sysctl_table_root,
177         .set = &sysctl_table_root.default_set,
178 };
179 static struct ctl_table_root sysctl_table_root = {
180         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
181         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
182 };
183
184 static struct ctl_table kern_table[];
185 static struct ctl_table vm_table[];
186 static struct ctl_table fs_table[];
187 static struct ctl_table debug_table[];
188 static struct ctl_table dev_table[];
189 extern struct ctl_table random_table[];
190 #ifdef CONFIG_INOTIFY_USER
191 extern struct ctl_table inotify_table[];
192 #endif
193 #ifdef CONFIG_EPOLL
194 extern struct ctl_table epoll_table[];
195 #endif
196
197 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
198 int sysctl_legacy_va_layout;
199 #endif
200
201 extern int prove_locking;
202 extern int lock_stat;
203
204 /* The default sysctl tables: */
205
206 static struct ctl_table root_table[] = {
207         {
208                 .procname       = "kernel",
209                 .mode           = 0555,
210                 .child          = kern_table,
211         },
212         {
213                 .procname       = "vm",
214                 .mode           = 0555,
215                 .child          = vm_table,
216         },
217         {
218                 .procname       = "fs",
219                 .mode           = 0555,
220                 .child          = fs_table,
221         },
222         {
223                 .procname       = "debug",
224                 .mode           = 0555,
225                 .child          = debug_table,
226         },
227         {
228                 .procname       = "dev",
229                 .mode           = 0555,
230                 .child          = dev_table,
231         },
232 /*
233  * NOTE: do not add new entries to this table unless you have read
234  * Documentation/sysctl/ctl_unnumbered.txt
235  */
236         { }
237 };
238
239 #ifdef CONFIG_SCHED_DEBUG
240 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
241 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
242 static int min_wakeup_granularity_ns;                   /* 0 usecs */
243 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
244 #endif
245
246 static struct ctl_table kern_table[] = {
247         {
248                 .procname       = "sched_child_runs_first",
249                 .data           = &sysctl_sched_child_runs_first,
250                 .maxlen         = sizeof(unsigned int),
251                 .mode           = 0644,
252                 .proc_handler   = &proc_dointvec,
253         },
254 #ifdef CONFIG_SCHED_DEBUG
255         {
256                 .procname       = "sched_min_granularity_ns",
257                 .data           = &sysctl_sched_min_granularity,
258                 .maxlen         = sizeof(unsigned int),
259                 .mode           = 0644,
260                 .proc_handler   = &sched_nr_latency_handler,
261                 .extra1         = &min_sched_granularity_ns,
262                 .extra2         = &max_sched_granularity_ns,
263         },
264         {
265                 .procname       = "sched_latency_ns",
266                 .data           = &sysctl_sched_latency,
267                 .maxlen         = sizeof(unsigned int),
268                 .mode           = 0644,
269                 .proc_handler   = &sched_nr_latency_handler,
270                 .extra1         = &min_sched_granularity_ns,
271                 .extra2         = &max_sched_granularity_ns,
272         },
273         {
274                 .procname       = "sched_wakeup_granularity_ns",
275                 .data           = &sysctl_sched_wakeup_granularity,
276                 .maxlen         = sizeof(unsigned int),
277                 .mode           = 0644,
278                 .proc_handler   = &proc_dointvec_minmax,
279                 .extra1         = &min_wakeup_granularity_ns,
280                 .extra2         = &max_wakeup_granularity_ns,
281         },
282         {
283                 .procname       = "sched_shares_ratelimit",
284                 .data           = &sysctl_sched_shares_ratelimit,
285                 .maxlen         = sizeof(unsigned int),
286                 .mode           = 0644,
287                 .proc_handler   = &proc_dointvec,
288         },
289         {
290                 .procname       = "sched_shares_thresh",
291                 .data           = &sysctl_sched_shares_thresh,
292                 .maxlen         = sizeof(unsigned int),
293                 .mode           = 0644,
294                 .proc_handler   = &proc_dointvec_minmax,
295                 .extra1         = &zero,
296         },
297         {
298                 .procname       = "sched_features",
299                 .data           = &sysctl_sched_features,
300                 .maxlen         = sizeof(unsigned int),
301                 .mode           = 0644,
302                 .proc_handler   = &proc_dointvec,
303         },
304         {
305                 .procname       = "sched_migration_cost",
306                 .data           = &sysctl_sched_migration_cost,
307                 .maxlen         = sizeof(unsigned int),
308                 .mode           = 0644,
309                 .proc_handler   = &proc_dointvec,
310         },
311         {
312                 .procname       = "sched_nr_migrate",
313                 .data           = &sysctl_sched_nr_migrate,
314                 .maxlen         = sizeof(unsigned int),
315                 .mode           = 0644,
316                 .proc_handler   = &proc_dointvec,
317         },
318         {
319                 .procname       = "sched_time_avg",
320                 .data           = &sysctl_sched_time_avg,
321                 .maxlen         = sizeof(unsigned int),
322                 .mode           = 0644,
323                 .proc_handler   = &proc_dointvec,
324         },
325         {
326                 .procname       = "timer_migration",
327                 .data           = &sysctl_timer_migration,
328                 .maxlen         = sizeof(unsigned int),
329                 .mode           = 0644,
330                 .proc_handler   = &proc_dointvec_minmax,
331                 .extra1         = &zero,
332                 .extra2         = &one,
333         },
334 #endif
335         {
336                 .procname       = "sched_rt_period_us",
337                 .data           = &sysctl_sched_rt_period,
338                 .maxlen         = sizeof(unsigned int),
339                 .mode           = 0644,
340                 .proc_handler   = &sched_rt_handler,
341         },
342         {
343                 .procname       = "sched_rt_runtime_us",
344                 .data           = &sysctl_sched_rt_runtime,
345                 .maxlen         = sizeof(int),
346                 .mode           = 0644,
347                 .proc_handler   = &sched_rt_handler,
348         },
349         {
350                 .procname       = "sched_compat_yield",
351                 .data           = &sysctl_sched_compat_yield,
352                 .maxlen         = sizeof(unsigned int),
353                 .mode           = 0644,
354                 .proc_handler   = &proc_dointvec,
355         },
356 #ifdef CONFIG_PROVE_LOCKING
357         {
358                 .procname       = "prove_locking",
359                 .data           = &prove_locking,
360                 .maxlen         = sizeof(int),
361                 .mode           = 0644,
362                 .proc_handler   = &proc_dointvec,
363         },
364 #endif
365 #ifdef CONFIG_LOCK_STAT
366         {
367                 .procname       = "lock_stat",
368                 .data           = &lock_stat,
369                 .maxlen         = sizeof(int),
370                 .mode           = 0644,
371                 .proc_handler   = &proc_dointvec,
372         },
373 #endif
374         {
375                 .procname       = "panic",
376                 .data           = &panic_timeout,
377                 .maxlen         = sizeof(int),
378                 .mode           = 0644,
379                 .proc_handler   = &proc_dointvec,
380         },
381         {
382                 .procname       = "core_uses_pid",
383                 .data           = &core_uses_pid,
384                 .maxlen         = sizeof(int),
385                 .mode           = 0644,
386                 .proc_handler   = &proc_dointvec,
387         },
388         {
389                 .procname       = "core_pattern",
390                 .data           = core_pattern,
391                 .maxlen         = CORENAME_MAX_SIZE,
392                 .mode           = 0644,
393                 .proc_handler   = &proc_dostring,
394         },
395         {
396                 .procname       = "core_pipe_limit",
397                 .data           = &core_pipe_limit,
398                 .maxlen         = sizeof(unsigned int),
399                 .mode           = 0644,
400                 .proc_handler   = &proc_dointvec,
401         },
402 #ifdef CONFIG_PROC_SYSCTL
403         {
404                 .procname       = "tainted",
405                 .maxlen         = sizeof(long),
406                 .mode           = 0644,
407                 .proc_handler   = &proc_taint,
408         },
409 #endif
410 #ifdef CONFIG_LATENCYTOP
411         {
412                 .procname       = "latencytop",
413                 .data           = &latencytop_enabled,
414                 .maxlen         = sizeof(int),
415                 .mode           = 0644,
416                 .proc_handler   = &proc_dointvec,
417         },
418 #endif
419 #ifdef CONFIG_BLK_DEV_INITRD
420         {
421                 .procname       = "real-root-dev",
422                 .data           = &real_root_dev,
423                 .maxlen         = sizeof(int),
424                 .mode           = 0644,
425                 .proc_handler   = &proc_dointvec,
426         },
427 #endif
428         {
429                 .procname       = "print-fatal-signals",
430                 .data           = &print_fatal_signals,
431                 .maxlen         = sizeof(int),
432                 .mode           = 0644,
433                 .proc_handler   = &proc_dointvec,
434         },
435 #ifdef CONFIG_SPARC
436         {
437                 .procname       = "reboot-cmd",
438                 .data           = reboot_command,
439                 .maxlen         = 256,
440                 .mode           = 0644,
441                 .proc_handler   = &proc_dostring,
442         },
443         {
444                 .procname       = "stop-a",
445                 .data           = &stop_a_enabled,
446                 .maxlen         = sizeof (int),
447                 .mode           = 0644,
448                 .proc_handler   = &proc_dointvec,
449         },
450         {
451                 .procname       = "scons-poweroff",
452                 .data           = &scons_pwroff,
453                 .maxlen         = sizeof (int),
454                 .mode           = 0644,
455                 .proc_handler   = &proc_dointvec,
456         },
457 #endif
458 #ifdef CONFIG_SPARC64
459         {
460                 .procname       = "tsb-ratio",
461                 .data           = &sysctl_tsb_ratio,
462                 .maxlen         = sizeof (int),
463                 .mode           = 0644,
464                 .proc_handler   = &proc_dointvec,
465         },
466 #endif
467 #ifdef __hppa__
468         {
469                 .procname       = "soft-power",
470                 .data           = &pwrsw_enabled,
471                 .maxlen         = sizeof (int),
472                 .mode           = 0644,
473                 .proc_handler   = &proc_dointvec,
474         },
475         {
476                 .procname       = "unaligned-trap",
477                 .data           = &unaligned_enabled,
478                 .maxlen         = sizeof (int),
479                 .mode           = 0644,
480                 .proc_handler   = &proc_dointvec,
481         },
482 #endif
483         {
484                 .procname       = "ctrl-alt-del",
485                 .data           = &C_A_D,
486                 .maxlen         = sizeof(int),
487                 .mode           = 0644,
488                 .proc_handler   = &proc_dointvec,
489         },
490 #ifdef CONFIG_FUNCTION_TRACER
491         {
492                 .procname       = "ftrace_enabled",
493                 .data           = &ftrace_enabled,
494                 .maxlen         = sizeof(int),
495                 .mode           = 0644,
496                 .proc_handler   = &ftrace_enable_sysctl,
497         },
498 #endif
499 #ifdef CONFIG_STACK_TRACER
500         {
501                 .procname       = "stack_tracer_enabled",
502                 .data           = &stack_tracer_enabled,
503                 .maxlen         = sizeof(int),
504                 .mode           = 0644,
505                 .proc_handler   = &stack_trace_sysctl,
506         },
507 #endif
508 #ifdef CONFIG_TRACING
509         {
510                 .procname       = "ftrace_dump_on_oops",
511                 .data           = &ftrace_dump_on_oops,
512                 .maxlen         = sizeof(int),
513                 .mode           = 0644,
514                 .proc_handler   = &proc_dointvec,
515         },
516 #endif
517 #ifdef CONFIG_MODULES
518         {
519                 .procname       = "modprobe",
520                 .data           = &modprobe_path,
521                 .maxlen         = KMOD_PATH_LEN,
522                 .mode           = 0644,
523                 .proc_handler   = &proc_dostring,
524         },
525         {
526                 .procname       = "modules_disabled",
527                 .data           = &modules_disabled,
528                 .maxlen         = sizeof(int),
529                 .mode           = 0644,
530                 /* only handle a transition from default "0" to "1" */
531                 .proc_handler   = &proc_dointvec_minmax,
532                 .extra1         = &one,
533                 .extra2         = &one,
534         },
535 #endif
536 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
537         {
538                 .procname       = "hotplug",
539                 .data           = &uevent_helper,
540                 .maxlen         = UEVENT_HELPER_PATH_LEN,
541                 .mode           = 0644,
542                 .proc_handler   = &proc_dostring,
543         },
544 #endif
545 #ifdef CONFIG_CHR_DEV_SG
546         {
547                 .procname       = "sg-big-buff",
548                 .data           = &sg_big_buff,
549                 .maxlen         = sizeof (int),
550                 .mode           = 0444,
551                 .proc_handler   = &proc_dointvec,
552         },
553 #endif
554 #ifdef CONFIG_BSD_PROCESS_ACCT
555         {
556                 .procname       = "acct",
557                 .data           = &acct_parm,
558                 .maxlen         = 3*sizeof(int),
559                 .mode           = 0644,
560                 .proc_handler   = &proc_dointvec,
561         },
562 #endif
563 #ifdef CONFIG_MAGIC_SYSRQ
564         {
565                 .procname       = "sysrq",
566                 .data           = &__sysrq_enabled,
567                 .maxlen         = sizeof (int),
568                 .mode           = 0644,
569                 .proc_handler   = &proc_dointvec,
570         },
571 #endif
572 #ifdef CONFIG_PROC_SYSCTL
573         {
574                 .procname       = "cad_pid",
575                 .data           = NULL,
576                 .maxlen         = sizeof (int),
577                 .mode           = 0600,
578                 .proc_handler   = &proc_do_cad_pid,
579         },
580 #endif
581         {
582                 .procname       = "threads-max",
583                 .data           = &max_threads,
584                 .maxlen         = sizeof(int),
585                 .mode           = 0644,
586                 .proc_handler   = &proc_dointvec,
587         },
588         {
589                 .procname       = "random",
590                 .mode           = 0555,
591                 .child          = random_table,
592         },
593         {
594                 .procname       = "overflowuid",
595                 .data           = &overflowuid,
596                 .maxlen         = sizeof(int),
597                 .mode           = 0644,
598                 .proc_handler   = &proc_dointvec_minmax,
599                 .extra1         = &minolduid,
600                 .extra2         = &maxolduid,
601         },
602         {
603                 .procname       = "overflowgid",
604                 .data           = &overflowgid,
605                 .maxlen         = sizeof(int),
606                 .mode           = 0644,
607                 .proc_handler   = &proc_dointvec_minmax,
608                 .extra1         = &minolduid,
609                 .extra2         = &maxolduid,
610         },
611 #ifdef CONFIG_S390
612 #ifdef CONFIG_MATHEMU
613         {
614                 .procname       = "ieee_emulation_warnings",
615                 .data           = &sysctl_ieee_emulation_warnings,
616                 .maxlen         = sizeof(int),
617                 .mode           = 0644,
618                 .proc_handler   = &proc_dointvec,
619         },
620 #endif
621         {
622                 .procname       = "userprocess_debug",
623                 .data           = &sysctl_userprocess_debug,
624                 .maxlen         = sizeof(int),
625                 .mode           = 0644,
626                 .proc_handler   = &proc_dointvec,
627         },
628 #endif
629         {
630                 .procname       = "pid_max",
631                 .data           = &pid_max,
632                 .maxlen         = sizeof (int),
633                 .mode           = 0644,
634                 .proc_handler   = &proc_dointvec_minmax,
635                 .extra1         = &pid_max_min,
636                 .extra2         = &pid_max_max,
637         },
638         {
639                 .procname       = "panic_on_oops",
640                 .data           = &panic_on_oops,
641                 .maxlen         = sizeof(int),
642                 .mode           = 0644,
643                 .proc_handler   = &proc_dointvec,
644         },
645 #if defined CONFIG_PRINTK
646         {
647                 .procname       = "printk",
648                 .data           = &console_loglevel,
649                 .maxlen         = 4*sizeof(int),
650                 .mode           = 0644,
651                 .proc_handler   = &proc_dointvec,
652         },
653         {
654                 .procname       = "printk_ratelimit",
655                 .data           = &printk_ratelimit_state.interval,
656                 .maxlen         = sizeof(int),
657                 .mode           = 0644,
658                 .proc_handler   = &proc_dointvec_jiffies,
659         },
660         {
661                 .procname       = "printk_ratelimit_burst",
662                 .data           = &printk_ratelimit_state.burst,
663                 .maxlen         = sizeof(int),
664                 .mode           = 0644,
665                 .proc_handler   = &proc_dointvec,
666         },
667         {
668                 .procname       = "printk_delay",
669                 .data           = &printk_delay_msec,
670                 .maxlen         = sizeof(int),
671                 .mode           = 0644,
672                 .proc_handler   = &proc_dointvec_minmax,
673                 .extra1         = &zero,
674                 .extra2         = &ten_thousand,
675         },
676 #endif
677         {
678                 .procname       = "ngroups_max",
679                 .data           = &ngroups_max,
680                 .maxlen         = sizeof (int),
681                 .mode           = 0444,
682                 .proc_handler   = &proc_dointvec,
683         },
684 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
685         {
686                 .procname       = "unknown_nmi_panic",
687                 .data           = &unknown_nmi_panic,
688                 .maxlen         = sizeof (int),
689                 .mode           = 0644,
690                 .proc_handler   = &proc_dointvec,
691         },
692         {
693                 .procname       = "nmi_watchdog",
694                 .data           = &nmi_watchdog_enabled,
695                 .maxlen         = sizeof (int),
696                 .mode           = 0644,
697                 .proc_handler   = &proc_nmi_enabled,
698         },
699 #endif
700 #if defined(CONFIG_X86)
701         {
702                 .procname       = "panic_on_unrecovered_nmi",
703                 .data           = &panic_on_unrecovered_nmi,
704                 .maxlen         = sizeof(int),
705                 .mode           = 0644,
706                 .proc_handler   = &proc_dointvec,
707         },
708         {
709                 .procname       = "panic_on_io_nmi",
710                 .data           = &panic_on_io_nmi,
711                 .maxlen         = sizeof(int),
712                 .mode           = 0644,
713                 .proc_handler   = &proc_dointvec,
714         },
715         {
716                 .procname       = "bootloader_type",
717                 .data           = &bootloader_type,
718                 .maxlen         = sizeof (int),
719                 .mode           = 0444,
720                 .proc_handler   = &proc_dointvec,
721         },
722         {
723                 .procname       = "bootloader_version",
724                 .data           = &bootloader_version,
725                 .maxlen         = sizeof (int),
726                 .mode           = 0444,
727                 .proc_handler   = &proc_dointvec,
728         },
729         {
730                 .procname       = "kstack_depth_to_print",
731                 .data           = &kstack_depth_to_print,
732                 .maxlen         = sizeof(int),
733                 .mode           = 0644,
734                 .proc_handler   = &proc_dointvec,
735         },
736         {
737                 .procname       = "io_delay_type",
738                 .data           = &io_delay_type,
739                 .maxlen         = sizeof(int),
740                 .mode           = 0644,
741                 .proc_handler   = &proc_dointvec,
742         },
743 #endif
744 #if defined(CONFIG_MMU)
745         {
746                 .procname       = "randomize_va_space",
747                 .data           = &randomize_va_space,
748                 .maxlen         = sizeof(int),
749                 .mode           = 0644,
750                 .proc_handler   = &proc_dointvec,
751         },
752 #endif
753 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
754         {
755                 .procname       = "spin_retry",
756                 .data           = &spin_retry,
757                 .maxlen         = sizeof (int),
758                 .mode           = 0644,
759                 .proc_handler   = &proc_dointvec,
760         },
761 #endif
762 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
763         {
764                 .procname       = "acpi_video_flags",
765                 .data           = &acpi_realmode_flags,
766                 .maxlen         = sizeof (unsigned long),
767                 .mode           = 0644,
768                 .proc_handler   = &proc_doulongvec_minmax,
769         },
770 #endif
771 #ifdef CONFIG_IA64
772         {
773                 .procname       = "ignore-unaligned-usertrap",
774                 .data           = &no_unaligned_warning,
775                 .maxlen         = sizeof (int),
776                 .mode           = 0644,
777                 .proc_handler   = &proc_dointvec,
778         },
779         {
780                 .procname       = "unaligned-dump-stack",
781                 .data           = &unaligned_dump_stack,
782                 .maxlen         = sizeof (int),
783                 .mode           = 0644,
784                 .proc_handler   = &proc_dointvec,
785         },
786 #endif
787 #ifdef CONFIG_DETECT_SOFTLOCKUP
788         {
789                 .procname       = "softlockup_panic",
790                 .data           = &softlockup_panic,
791                 .maxlen         = sizeof(int),
792                 .mode           = 0644,
793                 .proc_handler   = &proc_dointvec_minmax,
794                 .extra1         = &zero,
795                 .extra2         = &one,
796         },
797         {
798                 .procname       = "softlockup_thresh",
799                 .data           = &softlockup_thresh,
800                 .maxlen         = sizeof(int),
801                 .mode           = 0644,
802                 .proc_handler   = &proc_dosoftlockup_thresh,
803                 .extra1         = &neg_one,
804                 .extra2         = &sixty,
805         },
806 #endif
807 #ifdef CONFIG_DETECT_HUNG_TASK
808         {
809                 .procname       = "hung_task_panic",
810                 .data           = &sysctl_hung_task_panic,
811                 .maxlen         = sizeof(int),
812                 .mode           = 0644,
813                 .proc_handler   = &proc_dointvec_minmax,
814                 .extra1         = &zero,
815                 .extra2         = &one,
816         },
817         {
818                 .procname       = "hung_task_check_count",
819                 .data           = &sysctl_hung_task_check_count,
820                 .maxlen         = sizeof(unsigned long),
821                 .mode           = 0644,
822                 .proc_handler   = &proc_doulongvec_minmax,
823         },
824         {
825                 .procname       = "hung_task_timeout_secs",
826                 .data           = &sysctl_hung_task_timeout_secs,
827                 .maxlen         = sizeof(unsigned long),
828                 .mode           = 0644,
829                 .proc_handler   = &proc_dohung_task_timeout_secs,
830         },
831         {
832                 .procname       = "hung_task_warnings",
833                 .data           = &sysctl_hung_task_warnings,
834                 .maxlen         = sizeof(unsigned long),
835                 .mode           = 0644,
836                 .proc_handler   = &proc_doulongvec_minmax,
837         },
838 #endif
839 #ifdef CONFIG_COMPAT
840         {
841                 .procname       = "compat-log",
842                 .data           = &compat_log,
843                 .maxlen         = sizeof (int),
844                 .mode           = 0644,
845                 .proc_handler   = &proc_dointvec,
846         },
847 #endif
848 #ifdef CONFIG_RT_MUTEXES
849         {
850                 .procname       = "max_lock_depth",
851                 .data           = &max_lock_depth,
852                 .maxlen         = sizeof(int),
853                 .mode           = 0644,
854                 .proc_handler   = &proc_dointvec,
855         },
856 #endif
857         {
858                 .procname       = "poweroff_cmd",
859                 .data           = &poweroff_cmd,
860                 .maxlen         = POWEROFF_CMD_PATH_LEN,
861                 .mode           = 0644,
862                 .proc_handler   = &proc_dostring,
863         },
864 #ifdef CONFIG_KEYS
865         {
866                 .procname       = "keys",
867                 .mode           = 0555,
868                 .child          = key_sysctls,
869         },
870 #endif
871 #ifdef CONFIG_RCU_TORTURE_TEST
872         {
873                 .procname       = "rcutorture_runnable",
874                 .data           = &rcutorture_runnable,
875                 .maxlen         = sizeof(int),
876                 .mode           = 0644,
877                 .proc_handler   = &proc_dointvec,
878         },
879 #endif
880 #ifdef CONFIG_SLOW_WORK
881         {
882                 .procname       = "slow-work",
883                 .mode           = 0555,
884                 .child          = slow_work_sysctls,
885         },
886 #endif
887 #ifdef CONFIG_PERF_EVENTS
888         {
889                 .procname       = "perf_event_paranoid",
890                 .data           = &sysctl_perf_event_paranoid,
891                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
892                 .mode           = 0644,
893                 .proc_handler   = &proc_dointvec,
894         },
895         {
896                 .procname       = "perf_event_mlock_kb",
897                 .data           = &sysctl_perf_event_mlock,
898                 .maxlen         = sizeof(sysctl_perf_event_mlock),
899                 .mode           = 0644,
900                 .proc_handler   = &proc_dointvec,
901         },
902         {
903                 .procname       = "perf_event_max_sample_rate",
904                 .data           = &sysctl_perf_event_sample_rate,
905                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
906                 .mode           = 0644,
907                 .proc_handler   = &proc_dointvec,
908         },
909 #endif
910 #ifdef CONFIG_KMEMCHECK
911         {
912                 .procname       = "kmemcheck",
913                 .data           = &kmemcheck_enabled,
914                 .maxlen         = sizeof(int),
915                 .mode           = 0644,
916                 .proc_handler   = &proc_dointvec,
917         },
918 #endif
919 #ifdef CONFIG_BLOCK
920         {
921                 .procname       = "blk_iopoll",
922                 .data           = &blk_iopoll_enabled,
923                 .maxlen         = sizeof(int),
924                 .mode           = 0644,
925                 .proc_handler   = &proc_dointvec,
926         },
927 #endif
928 /*
929  * NOTE: do not add new entries to this table unless you have read
930  * Documentation/sysctl/ctl_unnumbered.txt
931  */
932         { }
933 };
934
935 static struct ctl_table vm_table[] = {
936         {
937                 .procname       = "overcommit_memory",
938                 .data           = &sysctl_overcommit_memory,
939                 .maxlen         = sizeof(sysctl_overcommit_memory),
940                 .mode           = 0644,
941                 .proc_handler   = &proc_dointvec,
942         },
943         {
944                 .procname       = "panic_on_oom",
945                 .data           = &sysctl_panic_on_oom,
946                 .maxlen         = sizeof(sysctl_panic_on_oom),
947                 .mode           = 0644,
948                 .proc_handler   = &proc_dointvec,
949         },
950         {
951                 .procname       = "oom_kill_allocating_task",
952                 .data           = &sysctl_oom_kill_allocating_task,
953                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
954                 .mode           = 0644,
955                 .proc_handler   = &proc_dointvec,
956         },
957         {
958                 .procname       = "oom_dump_tasks",
959                 .data           = &sysctl_oom_dump_tasks,
960                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
961                 .mode           = 0644,
962                 .proc_handler   = &proc_dointvec,
963         },
964         {
965                 .procname       = "overcommit_ratio",
966                 .data           = &sysctl_overcommit_ratio,
967                 .maxlen         = sizeof(sysctl_overcommit_ratio),
968                 .mode           = 0644,
969                 .proc_handler   = &proc_dointvec,
970         },
971         {
972                 .procname       = "page-cluster", 
973                 .data           = &page_cluster,
974                 .maxlen         = sizeof(int),
975                 .mode           = 0644,
976                 .proc_handler   = &proc_dointvec,
977         },
978         {
979                 .procname       = "dirty_background_ratio",
980                 .data           = &dirty_background_ratio,
981                 .maxlen         = sizeof(dirty_background_ratio),
982                 .mode           = 0644,
983                 .proc_handler   = &dirty_background_ratio_handler,
984                 .extra1         = &zero,
985                 .extra2         = &one_hundred,
986         },
987         {
988                 .procname       = "dirty_background_bytes",
989                 .data           = &dirty_background_bytes,
990                 .maxlen         = sizeof(dirty_background_bytes),
991                 .mode           = 0644,
992                 .proc_handler   = &dirty_background_bytes_handler,
993                 .extra1         = &one_ul,
994         },
995         {
996                 .procname       = "dirty_ratio",
997                 .data           = &vm_dirty_ratio,
998                 .maxlen         = sizeof(vm_dirty_ratio),
999                 .mode           = 0644,
1000                 .proc_handler   = &dirty_ratio_handler,
1001                 .extra1         = &zero,
1002                 .extra2         = &one_hundred,
1003         },
1004         {
1005                 .procname       = "dirty_bytes",
1006                 .data           = &vm_dirty_bytes,
1007                 .maxlen         = sizeof(vm_dirty_bytes),
1008                 .mode           = 0644,
1009                 .proc_handler   = &dirty_bytes_handler,
1010                 .extra1         = &dirty_bytes_min,
1011         },
1012         {
1013                 .procname       = "dirty_writeback_centisecs",
1014                 .data           = &dirty_writeback_interval,
1015                 .maxlen         = sizeof(dirty_writeback_interval),
1016                 .mode           = 0644,
1017                 .proc_handler   = &dirty_writeback_centisecs_handler,
1018         },
1019         {
1020                 .procname       = "dirty_expire_centisecs",
1021                 .data           = &dirty_expire_interval,
1022                 .maxlen         = sizeof(dirty_expire_interval),
1023                 .mode           = 0644,
1024                 .proc_handler   = &proc_dointvec,
1025         },
1026         {
1027                 .procname       = "nr_pdflush_threads",
1028                 .data           = &nr_pdflush_threads,
1029                 .maxlen         = sizeof nr_pdflush_threads,
1030                 .mode           = 0444 /* read-only*/,
1031                 .proc_handler   = &proc_dointvec,
1032         },
1033         {
1034                 .procname       = "swappiness",
1035                 .data           = &vm_swappiness,
1036                 .maxlen         = sizeof(vm_swappiness),
1037                 .mode           = 0644,
1038                 .proc_handler   = &proc_dointvec_minmax,
1039                 .extra1         = &zero,
1040                 .extra2         = &one_hundred,
1041         },
1042 #ifdef CONFIG_HUGETLB_PAGE
1043          {
1044                 .procname       = "nr_hugepages",
1045                 .data           = NULL,
1046                 .maxlen         = sizeof(unsigned long),
1047                 .mode           = 0644,
1048                 .proc_handler   = &hugetlb_sysctl_handler,
1049                 .extra1         = (void *)&hugetlb_zero,
1050                 .extra2         = (void *)&hugetlb_infinity,
1051          },
1052          {
1053                 .procname       = "hugetlb_shm_group",
1054                 .data           = &sysctl_hugetlb_shm_group,
1055                 .maxlen         = sizeof(gid_t),
1056                 .mode           = 0644,
1057                 .proc_handler   = &proc_dointvec,
1058          },
1059          {
1060                 .procname       = "hugepages_treat_as_movable",
1061                 .data           = &hugepages_treat_as_movable,
1062                 .maxlen         = sizeof(int),
1063                 .mode           = 0644,
1064                 .proc_handler   = &hugetlb_treat_movable_handler,
1065         },
1066         {
1067                 .procname       = "nr_overcommit_hugepages",
1068                 .data           = NULL,
1069                 .maxlen         = sizeof(unsigned long),
1070                 .mode           = 0644,
1071                 .proc_handler   = &hugetlb_overcommit_handler,
1072                 .extra1         = (void *)&hugetlb_zero,
1073                 .extra2         = (void *)&hugetlb_infinity,
1074         },
1075 #endif
1076         {
1077                 .procname       = "lowmem_reserve_ratio",
1078                 .data           = &sysctl_lowmem_reserve_ratio,
1079                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1080                 .mode           = 0644,
1081                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1082         },
1083         {
1084                 .procname       = "drop_caches",
1085                 .data           = &sysctl_drop_caches,
1086                 .maxlen         = sizeof(int),
1087                 .mode           = 0644,
1088                 .proc_handler   = drop_caches_sysctl_handler,
1089         },
1090         {
1091                 .procname       = "min_free_kbytes",
1092                 .data           = &min_free_kbytes,
1093                 .maxlen         = sizeof(min_free_kbytes),
1094                 .mode           = 0644,
1095                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1096                 .extra1         = &zero,
1097         },
1098         {
1099                 .procname       = "percpu_pagelist_fraction",
1100                 .data           = &percpu_pagelist_fraction,
1101                 .maxlen         = sizeof(percpu_pagelist_fraction),
1102                 .mode           = 0644,
1103                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1104                 .extra1         = &min_percpu_pagelist_fract,
1105         },
1106 #ifdef CONFIG_MMU
1107         {
1108                 .procname       = "max_map_count",
1109                 .data           = &sysctl_max_map_count,
1110                 .maxlen         = sizeof(sysctl_max_map_count),
1111                 .mode           = 0644,
1112                 .proc_handler   = &proc_dointvec
1113         },
1114 #else
1115         {
1116                 .procname       = "nr_trim_pages",
1117                 .data           = &sysctl_nr_trim_pages,
1118                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1119                 .mode           = 0644,
1120                 .proc_handler   = &proc_dointvec_minmax,
1121                 .extra1         = &zero,
1122         },
1123 #endif
1124         {
1125                 .procname       = "laptop_mode",
1126                 .data           = &laptop_mode,
1127                 .maxlen         = sizeof(laptop_mode),
1128                 .mode           = 0644,
1129                 .proc_handler   = &proc_dointvec_jiffies,
1130         },
1131         {
1132                 .procname       = "block_dump",
1133                 .data           = &block_dump,
1134                 .maxlen         = sizeof(block_dump),
1135                 .mode           = 0644,
1136                 .proc_handler   = &proc_dointvec,
1137                 .extra1         = &zero,
1138         },
1139         {
1140                 .procname       = "vfs_cache_pressure",
1141                 .data           = &sysctl_vfs_cache_pressure,
1142                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1143                 .mode           = 0644,
1144                 .proc_handler   = &proc_dointvec,
1145                 .extra1         = &zero,
1146         },
1147 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1148         {
1149                 .procname       = "legacy_va_layout",
1150                 .data           = &sysctl_legacy_va_layout,
1151                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1152                 .mode           = 0644,
1153                 .proc_handler   = &proc_dointvec,
1154                 .extra1         = &zero,
1155         },
1156 #endif
1157 #ifdef CONFIG_NUMA
1158         {
1159                 .procname       = "zone_reclaim_mode",
1160                 .data           = &zone_reclaim_mode,
1161                 .maxlen         = sizeof(zone_reclaim_mode),
1162                 .mode           = 0644,
1163                 .proc_handler   = &proc_dointvec,
1164                 .extra1         = &zero,
1165         },
1166         {
1167                 .procname       = "min_unmapped_ratio",
1168                 .data           = &sysctl_min_unmapped_ratio,
1169                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1170                 .mode           = 0644,
1171                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1172                 .extra1         = &zero,
1173                 .extra2         = &one_hundred,
1174         },
1175         {
1176                 .procname       = "min_slab_ratio",
1177                 .data           = &sysctl_min_slab_ratio,
1178                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1179                 .mode           = 0644,
1180                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1181                 .extra1         = &zero,
1182                 .extra2         = &one_hundred,
1183         },
1184 #endif
1185 #ifdef CONFIG_SMP
1186         {
1187                 .procname       = "stat_interval",
1188                 .data           = &sysctl_stat_interval,
1189                 .maxlen         = sizeof(sysctl_stat_interval),
1190                 .mode           = 0644,
1191                 .proc_handler   = &proc_dointvec_jiffies,
1192         },
1193 #endif
1194         {
1195                 .procname       = "mmap_min_addr",
1196                 .data           = &dac_mmap_min_addr,
1197                 .maxlen         = sizeof(unsigned long),
1198                 .mode           = 0644,
1199                 .proc_handler   = &mmap_min_addr_handler,
1200         },
1201 #ifdef CONFIG_NUMA
1202         {
1203                 .procname       = "numa_zonelist_order",
1204                 .data           = &numa_zonelist_order,
1205                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1206                 .mode           = 0644,
1207                 .proc_handler   = &numa_zonelist_order_handler,
1208         },
1209 #endif
1210 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1211    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1212         {
1213                 .procname       = "vdso_enabled",
1214                 .data           = &vdso_enabled,
1215                 .maxlen         = sizeof(vdso_enabled),
1216                 .mode           = 0644,
1217                 .proc_handler   = &proc_dointvec,
1218                 .extra1         = &zero,
1219         },
1220 #endif
1221 #ifdef CONFIG_HIGHMEM
1222         {
1223                 .procname       = "highmem_is_dirtyable",
1224                 .data           = &vm_highmem_is_dirtyable,
1225                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1226                 .mode           = 0644,
1227                 .proc_handler   = &proc_dointvec_minmax,
1228                 .extra1         = &zero,
1229                 .extra2         = &one,
1230         },
1231 #endif
1232         {
1233                 .procname       = "scan_unevictable_pages",
1234                 .data           = &scan_unevictable_pages,
1235                 .maxlen         = sizeof(scan_unevictable_pages),
1236                 .mode           = 0644,
1237                 .proc_handler   = &scan_unevictable_handler,
1238         },
1239 #ifdef CONFIG_MEMORY_FAILURE
1240         {
1241                 .procname       = "memory_failure_early_kill",
1242                 .data           = &sysctl_memory_failure_early_kill,
1243                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1244                 .mode           = 0644,
1245                 .proc_handler   = &proc_dointvec_minmax,
1246                 .extra1         = &zero,
1247                 .extra2         = &one,
1248         },
1249         {
1250                 .procname       = "memory_failure_recovery",
1251                 .data           = &sysctl_memory_failure_recovery,
1252                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1253                 .mode           = 0644,
1254                 .proc_handler   = &proc_dointvec_minmax,
1255                 .extra1         = &zero,
1256                 .extra2         = &one,
1257         },
1258 #endif
1259
1260 /*
1261  * NOTE: do not add new entries to this table unless you have read
1262  * Documentation/sysctl/ctl_unnumbered.txt
1263  */
1264         { }
1265 };
1266
1267 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1268 static struct ctl_table binfmt_misc_table[] = {
1269         { }
1270 };
1271 #endif
1272
1273 static struct ctl_table fs_table[] = {
1274         {
1275                 .procname       = "inode-nr",
1276                 .data           = &inodes_stat,
1277                 .maxlen         = 2*sizeof(int),
1278                 .mode           = 0444,
1279                 .proc_handler   = &proc_dointvec,
1280         },
1281         {
1282                 .procname       = "inode-state",
1283                 .data           = &inodes_stat,
1284                 .maxlen         = 7*sizeof(int),
1285                 .mode           = 0444,
1286                 .proc_handler   = &proc_dointvec,
1287         },
1288         {
1289                 .procname       = "file-nr",
1290                 .data           = &files_stat,
1291                 .maxlen         = 3*sizeof(int),
1292                 .mode           = 0444,
1293                 .proc_handler   = &proc_nr_files,
1294         },
1295         {
1296                 .procname       = "file-max",
1297                 .data           = &files_stat.max_files,
1298                 .maxlen         = sizeof(int),
1299                 .mode           = 0644,
1300                 .proc_handler   = &proc_dointvec,
1301         },
1302         {
1303                 .procname       = "nr_open",
1304                 .data           = &sysctl_nr_open,
1305                 .maxlen         = sizeof(int),
1306                 .mode           = 0644,
1307                 .proc_handler   = &proc_dointvec_minmax,
1308                 .extra1         = &sysctl_nr_open_min,
1309                 .extra2         = &sysctl_nr_open_max,
1310         },
1311         {
1312                 .procname       = "dentry-state",
1313                 .data           = &dentry_stat,
1314                 .maxlen         = 6*sizeof(int),
1315                 .mode           = 0444,
1316                 .proc_handler   = &proc_dointvec,
1317         },
1318         {
1319                 .procname       = "overflowuid",
1320                 .data           = &fs_overflowuid,
1321                 .maxlen         = sizeof(int),
1322                 .mode           = 0644,
1323                 .proc_handler   = &proc_dointvec_minmax,
1324                 .extra1         = &minolduid,
1325                 .extra2         = &maxolduid,
1326         },
1327         {
1328                 .procname       = "overflowgid",
1329                 .data           = &fs_overflowgid,
1330                 .maxlen         = sizeof(int),
1331                 .mode           = 0644,
1332                 .proc_handler   = &proc_dointvec_minmax,
1333                 .extra1         = &minolduid,
1334                 .extra2         = &maxolduid,
1335         },
1336 #ifdef CONFIG_FILE_LOCKING
1337         {
1338                 .procname       = "leases-enable",
1339                 .data           = &leases_enable,
1340                 .maxlen         = sizeof(int),
1341                 .mode           = 0644,
1342                 .proc_handler   = &proc_dointvec,
1343         },
1344 #endif
1345 #ifdef CONFIG_DNOTIFY
1346         {
1347                 .procname       = "dir-notify-enable",
1348                 .data           = &dir_notify_enable,
1349                 .maxlen         = sizeof(int),
1350                 .mode           = 0644,
1351                 .proc_handler   = &proc_dointvec,
1352         },
1353 #endif
1354 #ifdef CONFIG_MMU
1355 #ifdef CONFIG_FILE_LOCKING
1356         {
1357                 .procname       = "lease-break-time",
1358                 .data           = &lease_break_time,
1359                 .maxlen         = sizeof(int),
1360                 .mode           = 0644,
1361                 .proc_handler   = &proc_dointvec,
1362         },
1363 #endif
1364 #ifdef CONFIG_AIO
1365         {
1366                 .procname       = "aio-nr",
1367                 .data           = &aio_nr,
1368                 .maxlen         = sizeof(aio_nr),
1369                 .mode           = 0444,
1370                 .proc_handler   = &proc_doulongvec_minmax,
1371         },
1372         {
1373                 .procname       = "aio-max-nr",
1374                 .data           = &aio_max_nr,
1375                 .maxlen         = sizeof(aio_max_nr),
1376                 .mode           = 0644,
1377                 .proc_handler   = &proc_doulongvec_minmax,
1378         },
1379 #endif /* CONFIG_AIO */
1380 #ifdef CONFIG_INOTIFY_USER
1381         {
1382                 .procname       = "inotify",
1383                 .mode           = 0555,
1384                 .child          = inotify_table,
1385         },
1386 #endif  
1387 #ifdef CONFIG_EPOLL
1388         {
1389                 .procname       = "epoll",
1390                 .mode           = 0555,
1391                 .child          = epoll_table,
1392         },
1393 #endif
1394 #endif
1395         {
1396                 .procname       = "suid_dumpable",
1397                 .data           = &suid_dumpable,
1398                 .maxlen         = sizeof(int),
1399                 .mode           = 0644,
1400                 .proc_handler   = &proc_dointvec_minmax,
1401                 .extra1         = &zero,
1402                 .extra2         = &two,
1403         },
1404 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1405         {
1406                 .procname       = "binfmt_misc",
1407                 .mode           = 0555,
1408                 .child          = binfmt_misc_table,
1409         },
1410 #endif
1411 /*
1412  * NOTE: do not add new entries to this table unless you have read
1413  * Documentation/sysctl/ctl_unnumbered.txt
1414  */
1415         { }
1416 };
1417
1418 static struct ctl_table debug_table[] = {
1419 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1420         {
1421                 .procname       = "exception-trace",
1422                 .data           = &show_unhandled_signals,
1423                 .maxlen         = sizeof(int),
1424                 .mode           = 0644,
1425                 .proc_handler   = proc_dointvec
1426         },
1427 #endif
1428         { }
1429 };
1430
1431 static struct ctl_table dev_table[] = {
1432         { }
1433 };
1434
1435 static DEFINE_SPINLOCK(sysctl_lock);
1436
1437 /* called under sysctl_lock */
1438 static int use_table(struct ctl_table_header *p)
1439 {
1440         if (unlikely(p->unregistering))
1441                 return 0;
1442         p->used++;
1443         return 1;
1444 }
1445
1446 /* called under sysctl_lock */
1447 static void unuse_table(struct ctl_table_header *p)
1448 {
1449         if (!--p->used)
1450                 if (unlikely(p->unregistering))
1451                         complete(p->unregistering);
1452 }
1453
1454 /* called under sysctl_lock, will reacquire if has to wait */
1455 static void start_unregistering(struct ctl_table_header *p)
1456 {
1457         /*
1458          * if p->used is 0, nobody will ever touch that entry again;
1459          * we'll eliminate all paths to it before dropping sysctl_lock
1460          */
1461         if (unlikely(p->used)) {
1462                 struct completion wait;
1463                 init_completion(&wait);
1464                 p->unregistering = &wait;
1465                 spin_unlock(&sysctl_lock);
1466                 wait_for_completion(&wait);
1467                 spin_lock(&sysctl_lock);
1468         } else {
1469                 /* anything non-NULL; we'll never dereference it */
1470                 p->unregistering = ERR_PTR(-EINVAL);
1471         }
1472         /*
1473          * do not remove from the list until nobody holds it; walking the
1474          * list in do_sysctl() relies on that.
1475          */
1476         list_del_init(&p->ctl_entry);
1477 }
1478
1479 void sysctl_head_get(struct ctl_table_header *head)
1480 {
1481         spin_lock(&sysctl_lock);
1482         head->count++;
1483         spin_unlock(&sysctl_lock);
1484 }
1485
1486 void sysctl_head_put(struct ctl_table_header *head)
1487 {
1488         spin_lock(&sysctl_lock);
1489         if (!--head->count)
1490                 kfree(head);
1491         spin_unlock(&sysctl_lock);
1492 }
1493
1494 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1495 {
1496         if (!head)
1497                 BUG();
1498         spin_lock(&sysctl_lock);
1499         if (!use_table(head))
1500                 head = ERR_PTR(-ENOENT);
1501         spin_unlock(&sysctl_lock);
1502         return head;
1503 }
1504
1505 void sysctl_head_finish(struct ctl_table_header *head)
1506 {
1507         if (!head)
1508                 return;
1509         spin_lock(&sysctl_lock);
1510         unuse_table(head);
1511         spin_unlock(&sysctl_lock);
1512 }
1513
1514 static struct ctl_table_set *
1515 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1516 {
1517         struct ctl_table_set *set = &root->default_set;
1518         if (root->lookup)
1519                 set = root->lookup(root, namespaces);
1520         return set;
1521 }
1522
1523 static struct list_head *
1524 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1525 {
1526         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1527         return &set->list;
1528 }
1529
1530 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1531                                             struct ctl_table_header *prev)
1532 {
1533         struct ctl_table_root *root;
1534         struct list_head *header_list;
1535         struct ctl_table_header *head;
1536         struct list_head *tmp;
1537
1538         spin_lock(&sysctl_lock);
1539         if (prev) {
1540                 head = prev;
1541                 tmp = &prev->ctl_entry;
1542                 unuse_table(prev);
1543                 goto next;
1544         }
1545         tmp = &root_table_header.ctl_entry;
1546         for (;;) {
1547                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1548
1549                 if (!use_table(head))
1550                         goto next;
1551                 spin_unlock(&sysctl_lock);
1552                 return head;
1553         next:
1554                 root = head->root;
1555                 tmp = tmp->next;
1556                 header_list = lookup_header_list(root, namespaces);
1557                 if (tmp != header_list)
1558                         continue;
1559
1560                 do {
1561                         root = list_entry(root->root_list.next,
1562                                         struct ctl_table_root, root_list);
1563                         if (root == &sysctl_table_root)
1564                                 goto out;
1565                         header_list = lookup_header_list(root, namespaces);
1566                 } while (list_empty(header_list));
1567                 tmp = header_list->next;
1568         }
1569 out:
1570         spin_unlock(&sysctl_lock);
1571         return NULL;
1572 }
1573
1574 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1575 {
1576         return __sysctl_head_next(current->nsproxy, prev);
1577 }
1578
1579 void register_sysctl_root(struct ctl_table_root *root)
1580 {
1581         spin_lock(&sysctl_lock);
1582         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1583         spin_unlock(&sysctl_lock);
1584 }
1585
1586 /*
1587  * sysctl_perm does NOT grant the superuser all rights automatically, because
1588  * some sysctl variables are readonly even to root.
1589  */
1590
1591 static int test_perm(int mode, int op)
1592 {
1593         if (!current_euid())
1594                 mode >>= 6;
1595         else if (in_egroup_p(0))
1596                 mode >>= 3;
1597         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1598                 return 0;
1599         return -EACCES;
1600 }
1601
1602 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1603 {
1604         int error;
1605         int mode;
1606
1607         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1608         if (error)
1609                 return error;
1610
1611         if (root->permissions)
1612                 mode = root->permissions(root, current->nsproxy, table);
1613         else
1614                 mode = table->mode;
1615
1616         return test_perm(mode, op);
1617 }
1618
1619 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1620 {
1621         for (; table->ctl_name || table->procname; table++) {
1622                 table->parent = parent;
1623                 if (table->child)
1624                         sysctl_set_parent(table, table->child);
1625         }
1626 }
1627
1628 static __init int sysctl_init(void)
1629 {
1630         sysctl_set_parent(NULL, root_table);
1631 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1632         {
1633                 int err;
1634                 err = sysctl_check_table(current->nsproxy, root_table);
1635         }
1636 #endif
1637         return 0;
1638 }
1639
1640 core_initcall(sysctl_init);
1641
1642 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1643                                       struct ctl_table *table)
1644 {
1645         struct ctl_table *p;
1646         const char *s = branch->procname;
1647
1648         /* branch should have named subdirectory as its first element */
1649         if (!s || !branch->child)
1650                 return NULL;
1651
1652         /* ... and nothing else */
1653         if (branch[1].procname || branch[1].ctl_name)
1654                 return NULL;
1655
1656         /* table should contain subdirectory with the same name */
1657         for (p = table; p->procname || p->ctl_name; p++) {
1658                 if (!p->child)
1659                         continue;
1660                 if (p->procname && strcmp(p->procname, s) == 0)
1661                         return p;
1662         }
1663         return NULL;
1664 }
1665
1666 /* see if attaching q to p would be an improvement */
1667 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1668 {
1669         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1670         struct ctl_table *next;
1671         int is_better = 0;
1672         int not_in_parent = !p->attached_by;
1673
1674         while ((next = is_branch_in(by, to)) != NULL) {
1675                 if (by == q->attached_by)
1676                         is_better = 1;
1677                 if (to == p->attached_by)
1678                         not_in_parent = 1;
1679                 by = by->child;
1680                 to = next->child;
1681         }
1682
1683         if (is_better && not_in_parent) {
1684                 q->attached_by = by;
1685                 q->attached_to = to;
1686                 q->parent = p;
1687         }
1688 }
1689
1690 /**
1691  * __register_sysctl_paths - register a sysctl hierarchy
1692  * @root: List of sysctl headers to register on
1693  * @namespaces: Data to compute which lists of sysctl entries are visible
1694  * @path: The path to the directory the sysctl table is in.
1695  * @table: the top-level table structure
1696  *
1697  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1698  * array. A completely 0 filled entry terminates the table.
1699  *
1700  * The members of the &struct ctl_table structure are used as follows:
1701  *
1702  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1703  *            must be unique within that level of sysctl
1704  *
1705  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1706  *            enter a sysctl file
1707  *
1708  * data - a pointer to data for use by proc_handler
1709  *
1710  * maxlen - the maximum size in bytes of the data
1711  *
1712  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1713  *
1714  * child - a pointer to the child sysctl table if this entry is a directory, or
1715  *         %NULL.
1716  *
1717  * proc_handler - the text handler routine (described below)
1718  *
1719  * strategy - the strategy routine (described below)
1720  *
1721  * de - for internal use by the sysctl routines
1722  *
1723  * extra1, extra2 - extra pointers usable by the proc handler routines
1724  *
1725  * Leaf nodes in the sysctl tree will be represented by a single file
1726  * under /proc; non-leaf nodes will be represented by directories.
1727  *
1728  * sysctl(2) can automatically manage read and write requests through
1729  * the sysctl table.  The data and maxlen fields of the ctl_table
1730  * struct enable minimal validation of the values being written to be
1731  * performed, and the mode field allows minimal authentication.
1732  *
1733  * More sophisticated management can be enabled by the provision of a
1734  * strategy routine with the table entry.  This will be called before
1735  * any automatic read or write of the data is performed.
1736  *
1737  * The strategy routine may return
1738  *
1739  * < 0 - Error occurred (error is passed to user process)
1740  *
1741  * 0   - OK - proceed with automatic read or write.
1742  *
1743  * > 0 - OK - read or write has been done by the strategy routine, so
1744  *       return immediately.
1745  *
1746  * There must be a proc_handler routine for any terminal nodes
1747  * mirrored under /proc/sys (non-terminals are handled by a built-in
1748  * directory handler).  Several default handlers are available to
1749  * cover common cases -
1750  *
1751  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1752  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1753  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1754  *
1755  * It is the handler's job to read the input buffer from user memory
1756  * and process it. The handler should return 0 on success.
1757  *
1758  * This routine returns %NULL on a failure to register, and a pointer
1759  * to the table header on success.
1760  */
1761 struct ctl_table_header *__register_sysctl_paths(
1762         struct ctl_table_root *root,
1763         struct nsproxy *namespaces,
1764         const struct ctl_path *path, struct ctl_table *table)
1765 {
1766         struct ctl_table_header *header;
1767         struct ctl_table *new, **prevp;
1768         unsigned int n, npath;
1769         struct ctl_table_set *set;
1770
1771         /* Count the path components */
1772         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1773                 ;
1774
1775         /*
1776          * For each path component, allocate a 2-element ctl_table array.
1777          * The first array element will be filled with the sysctl entry
1778          * for this, the second will be the sentinel (ctl_name == 0).
1779          *
1780          * We allocate everything in one go so that we don't have to
1781          * worry about freeing additional memory in unregister_sysctl_table.
1782          */
1783         header = kzalloc(sizeof(struct ctl_table_header) +
1784                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1785         if (!header)
1786                 return NULL;
1787
1788         new = (struct ctl_table *) (header + 1);
1789
1790         /* Now connect the dots */
1791         prevp = &header->ctl_table;
1792         for (n = 0; n < npath; ++n, ++path) {
1793                 /* Copy the procname */
1794                 new->procname = path->procname;
1795                 new->ctl_name = path->ctl_name;
1796                 new->mode     = 0555;
1797
1798                 *prevp = new;
1799                 prevp = &new->child;
1800
1801                 new += 2;
1802         }
1803         *prevp = table;
1804         header->ctl_table_arg = table;
1805
1806         INIT_LIST_HEAD(&header->ctl_entry);
1807         header->used = 0;
1808         header->unregistering = NULL;
1809         header->root = root;
1810         sysctl_set_parent(NULL, header->ctl_table);
1811         header->count = 1;
1812 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1813         if (sysctl_check_table(namespaces, header->ctl_table)) {
1814                 kfree(header);
1815                 return NULL;
1816         }
1817 #endif
1818         spin_lock(&sysctl_lock);
1819         header->set = lookup_header_set(root, namespaces);
1820         header->attached_by = header->ctl_table;
1821         header->attached_to = root_table;
1822         header->parent = &root_table_header;
1823         for (set = header->set; set; set = set->parent) {
1824                 struct ctl_table_header *p;
1825                 list_for_each_entry(p, &set->list, ctl_entry) {
1826                         if (p->unregistering)
1827                                 continue;
1828                         try_attach(p, header);
1829                 }
1830         }
1831         header->parent->count++;
1832         list_add_tail(&header->ctl_entry, &header->set->list);
1833         spin_unlock(&sysctl_lock);
1834
1835         return header;
1836 }
1837
1838 /**
1839  * register_sysctl_table_path - register a sysctl table hierarchy
1840  * @path: The path to the directory the sysctl table is in.
1841  * @table: the top-level table structure
1842  *
1843  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1844  * array. A completely 0 filled entry terminates the table.
1845  *
1846  * See __register_sysctl_paths for more details.
1847  */
1848 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1849                                                 struct ctl_table *table)
1850 {
1851         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1852                                         path, table);
1853 }
1854
1855 /**
1856  * register_sysctl_table - register a sysctl table hierarchy
1857  * @table: the top-level table structure
1858  *
1859  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1860  * array. A completely 0 filled entry terminates the table.
1861  *
1862  * See register_sysctl_paths for more details.
1863  */
1864 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1865 {
1866         static const struct ctl_path null_path[] = { {} };
1867
1868         return register_sysctl_paths(null_path, table);
1869 }
1870
1871 /**
1872  * unregister_sysctl_table - unregister a sysctl table hierarchy
1873  * @header: the header returned from register_sysctl_table
1874  *
1875  * Unregisters the sysctl table and all children. proc entries may not
1876  * actually be removed until they are no longer used by anyone.
1877  */
1878 void unregister_sysctl_table(struct ctl_table_header * header)
1879 {
1880         might_sleep();
1881
1882         if (header == NULL)
1883                 return;
1884
1885         spin_lock(&sysctl_lock);
1886         start_unregistering(header);
1887         if (!--header->parent->count) {
1888                 WARN_ON(1);
1889                 kfree(header->parent);
1890         }
1891         if (!--header->count)
1892                 kfree(header);
1893         spin_unlock(&sysctl_lock);
1894 }
1895
1896 int sysctl_is_seen(struct ctl_table_header *p)
1897 {
1898         struct ctl_table_set *set = p->set;
1899         int res;
1900         spin_lock(&sysctl_lock);
1901         if (p->unregistering)
1902                 res = 0;
1903         else if (!set->is_seen)
1904                 res = 1;
1905         else
1906                 res = set->is_seen(set);
1907         spin_unlock(&sysctl_lock);
1908         return res;
1909 }
1910
1911 void setup_sysctl_set(struct ctl_table_set *p,
1912         struct ctl_table_set *parent,
1913         int (*is_seen)(struct ctl_table_set *))
1914 {
1915         INIT_LIST_HEAD(&p->list);
1916         p->parent = parent ? parent : &sysctl_table_root.default_set;
1917         p->is_seen = is_seen;
1918 }
1919
1920 #else /* !CONFIG_SYSCTL */
1921 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1922 {
1923         return NULL;
1924 }
1925
1926 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1927                                                     struct ctl_table *table)
1928 {
1929         return NULL;
1930 }
1931
1932 void unregister_sysctl_table(struct ctl_table_header * table)
1933 {
1934 }
1935
1936 void setup_sysctl_set(struct ctl_table_set *p,
1937         struct ctl_table_set *parent,
1938         int (*is_seen)(struct ctl_table_set *))
1939 {
1940 }
1941
1942 void sysctl_head_put(struct ctl_table_header *head)
1943 {
1944 }
1945
1946 #endif /* CONFIG_SYSCTL */
1947
1948 /*
1949  * /proc/sys support
1950  */
1951
1952 #ifdef CONFIG_PROC_SYSCTL
1953
1954 static int _proc_do_string(void* data, int maxlen, int write,
1955                            void __user *buffer,
1956                            size_t *lenp, loff_t *ppos)
1957 {
1958         size_t len;
1959         char __user *p;
1960         char c;
1961
1962         if (!data || !maxlen || !*lenp) {
1963                 *lenp = 0;
1964                 return 0;
1965         }
1966
1967         if (write) {
1968                 len = 0;
1969                 p = buffer;
1970                 while (len < *lenp) {
1971                         if (get_user(c, p++))
1972                                 return -EFAULT;
1973                         if (c == 0 || c == '\n')
1974                                 break;
1975                         len++;
1976                 }
1977                 if (len >= maxlen)
1978                         len = maxlen-1;
1979                 if(copy_from_user(data, buffer, len))
1980                         return -EFAULT;
1981                 ((char *) data)[len] = 0;
1982                 *ppos += *lenp;
1983         } else {
1984                 len = strlen(data);
1985                 if (len > maxlen)
1986                         len = maxlen;
1987
1988                 if (*ppos > len) {
1989                         *lenp = 0;
1990                         return 0;
1991                 }
1992
1993                 data += *ppos;
1994                 len  -= *ppos;
1995
1996                 if (len > *lenp)
1997                         len = *lenp;
1998                 if (len)
1999                         if(copy_to_user(buffer, data, len))
2000                                 return -EFAULT;
2001                 if (len < *lenp) {
2002                         if(put_user('\n', ((char __user *) buffer) + len))
2003                                 return -EFAULT;
2004                         len++;
2005                 }
2006                 *lenp = len;
2007                 *ppos += len;
2008         }
2009         return 0;
2010 }
2011
2012 /**
2013  * proc_dostring - read a string sysctl
2014  * @table: the sysctl table
2015  * @write: %TRUE if this is a write to the sysctl file
2016  * @buffer: the user buffer
2017  * @lenp: the size of the user buffer
2018  * @ppos: file position
2019  *
2020  * Reads/writes a string from/to the user buffer. If the kernel
2021  * buffer provided is not large enough to hold the string, the
2022  * string is truncated. The copied string is %NULL-terminated.
2023  * If the string is being read by the user process, it is copied
2024  * and a newline '\n' is added. It is truncated if the buffer is
2025  * not large enough.
2026  *
2027  * Returns 0 on success.
2028  */
2029 int proc_dostring(struct ctl_table *table, int write,
2030                   void __user *buffer, size_t *lenp, loff_t *ppos)
2031 {
2032         return _proc_do_string(table->data, table->maxlen, write,
2033                                buffer, lenp, ppos);
2034 }
2035
2036
2037 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2038                                  int *valp,
2039                                  int write, void *data)
2040 {
2041         if (write) {
2042                 *valp = *negp ? -*lvalp : *lvalp;
2043         } else {
2044                 int val = *valp;
2045                 if (val < 0) {
2046                         *negp = -1;
2047                         *lvalp = (unsigned long)-val;
2048                 } else {
2049                         *negp = 0;
2050                         *lvalp = (unsigned long)val;
2051                 }
2052         }
2053         return 0;
2054 }
2055
2056 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2057                   int write, void __user *buffer,
2058                   size_t *lenp, loff_t *ppos,
2059                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2060                               int write, void *data),
2061                   void *data)
2062 {
2063 #define TMPBUFLEN 21
2064         int *i, vleft, first = 1, neg;
2065         unsigned long lval;
2066         size_t left, len;
2067         
2068         char buf[TMPBUFLEN], *p;
2069         char __user *s = buffer;
2070         
2071         if (!tbl_data || !table->maxlen || !*lenp ||
2072             (*ppos && !write)) {
2073                 *lenp = 0;
2074                 return 0;
2075         }
2076         
2077         i = (int *) tbl_data;
2078         vleft = table->maxlen / sizeof(*i);
2079         left = *lenp;
2080
2081         if (!conv)
2082                 conv = do_proc_dointvec_conv;
2083
2084         for (; left && vleft--; i++, first=0) {
2085                 if (write) {
2086                         while (left) {
2087                                 char c;
2088                                 if (get_user(c, s))
2089                                         return -EFAULT;
2090                                 if (!isspace(c))
2091                                         break;
2092                                 left--;
2093                                 s++;
2094                         }
2095                         if (!left)
2096                                 break;
2097                         neg = 0;
2098                         len = left;
2099                         if (len > sizeof(buf) - 1)
2100                                 len = sizeof(buf) - 1;
2101                         if (copy_from_user(buf, s, len))
2102                                 return -EFAULT;
2103                         buf[len] = 0;
2104                         p = buf;
2105                         if (*p == '-' && left > 1) {
2106                                 neg = 1;
2107                                 p++;
2108                         }
2109                         if (*p < '0' || *p > '9')
2110                                 break;
2111
2112                         lval = simple_strtoul(p, &p, 0);
2113
2114                         len = p-buf;
2115                         if ((len < left) && *p && !isspace(*p))
2116                                 break;
2117                         s += len;
2118                         left -= len;
2119
2120                         if (conv(&neg, &lval, i, 1, data))
2121                                 break;
2122                 } else {
2123                         p = buf;
2124                         if (!first)
2125                                 *p++ = '\t';
2126         
2127                         if (conv(&neg, &lval, i, 0, data))
2128                                 break;
2129
2130                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2131                         len = strlen(buf);
2132                         if (len > left)
2133                                 len = left;
2134                         if(copy_to_user(s, buf, len))
2135                                 return -EFAULT;
2136                         left -= len;
2137                         s += len;
2138                 }
2139         }
2140
2141         if (!write && !first && left) {
2142                 if(put_user('\n', s))
2143                         return -EFAULT;
2144                 left--, s++;
2145         }
2146         if (write) {
2147                 while (left) {
2148                         char c;
2149                         if (get_user(c, s++))
2150                                 return -EFAULT;
2151                         if (!isspace(c))
2152                                 break;
2153                         left--;
2154                 }
2155         }
2156         if (write && first)
2157                 return -EINVAL;
2158         *lenp -= left;
2159         *ppos += *lenp;
2160         return 0;
2161 #undef TMPBUFLEN
2162 }
2163
2164 static int do_proc_dointvec(struct ctl_table *table, int write,
2165                   void __user *buffer, size_t *lenp, loff_t *ppos,
2166                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2167                               int write, void *data),
2168                   void *data)
2169 {
2170         return __do_proc_dointvec(table->data, table, write,
2171                         buffer, lenp, ppos, conv, data);
2172 }
2173
2174 /**
2175  * proc_dointvec - read a vector of integers
2176  * @table: the sysctl table
2177  * @write: %TRUE if this is a write to the sysctl file
2178  * @buffer: the user buffer
2179  * @lenp: the size of the user buffer
2180  * @ppos: file position
2181  *
2182  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2183  * values from/to the user buffer, treated as an ASCII string. 
2184  *
2185  * Returns 0 on success.
2186  */
2187 int proc_dointvec(struct ctl_table *table, int write,
2188                      void __user *buffer, size_t *lenp, loff_t *ppos)
2189 {
2190     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2191                             NULL,NULL);
2192 }
2193
2194 /*
2195  * Taint values can only be increased
2196  * This means we can safely use a temporary.
2197  */
2198 static int proc_taint(struct ctl_table *table, int write,
2199                                void __user *buffer, size_t *lenp, loff_t *ppos)
2200 {
2201         struct ctl_table t;
2202         unsigned long tmptaint = get_taint();
2203         int err;
2204
2205         if (write && !capable(CAP_SYS_ADMIN))
2206                 return -EPERM;
2207
2208         t = *table;
2209         t.data = &tmptaint;
2210         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2211         if (err < 0)
2212                 return err;
2213
2214         if (write) {
2215                 /*
2216                  * Poor man's atomic or. Not worth adding a primitive
2217                  * to everyone's atomic.h for this
2218                  */
2219                 int i;
2220                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2221                         if ((tmptaint >> i) & 1)
2222                                 add_taint(i);
2223                 }
2224         }
2225
2226         return err;
2227 }
2228
2229 struct do_proc_dointvec_minmax_conv_param {
2230         int *min;
2231         int *max;
2232 };
2233
2234 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2235                                         int *valp, 
2236                                         int write, void *data)
2237 {
2238         struct do_proc_dointvec_minmax_conv_param *param = data;
2239         if (write) {
2240                 int val = *negp ? -*lvalp : *lvalp;
2241                 if ((param->min && *param->min > val) ||
2242                     (param->max && *param->max < val))
2243                         return -EINVAL;
2244                 *valp = val;
2245         } else {
2246                 int val = *valp;
2247                 if (val < 0) {
2248                         *negp = -1;
2249                         *lvalp = (unsigned long)-val;
2250                 } else {
2251                         *negp = 0;
2252                         *lvalp = (unsigned long)val;
2253                 }
2254         }
2255         return 0;
2256 }
2257
2258 /**
2259  * proc_dointvec_minmax - read a vector of integers with min/max values
2260  * @table: the sysctl table
2261  * @write: %TRUE if this is a write to the sysctl file
2262  * @buffer: the user buffer
2263  * @lenp: the size of the user buffer
2264  * @ppos: file position
2265  *
2266  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2267  * values from/to the user buffer, treated as an ASCII string.
2268  *
2269  * This routine will ensure the values are within the range specified by
2270  * table->extra1 (min) and table->extra2 (max).
2271  *
2272  * Returns 0 on success.
2273  */
2274 int proc_dointvec_minmax(struct ctl_table *table, int write,
2275                   void __user *buffer, size_t *lenp, loff_t *ppos)
2276 {
2277         struct do_proc_dointvec_minmax_conv_param param = {
2278                 .min = (int *) table->extra1,
2279                 .max = (int *) table->extra2,
2280         };
2281         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2282                                 do_proc_dointvec_minmax_conv, &param);
2283 }
2284
2285 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2286                                      void __user *buffer,
2287                                      size_t *lenp, loff_t *ppos,
2288                                      unsigned long convmul,
2289                                      unsigned long convdiv)
2290 {
2291 #define TMPBUFLEN 21
2292         unsigned long *i, *min, *max, val;
2293         int vleft, first=1, neg;
2294         size_t len, left;
2295         char buf[TMPBUFLEN], *p;
2296         char __user *s = buffer;
2297         
2298         if (!data || !table->maxlen || !*lenp ||
2299             (*ppos && !write)) {
2300                 *lenp = 0;
2301                 return 0;
2302         }
2303         
2304         i = (unsigned long *) data;
2305         min = (unsigned long *) table->extra1;
2306         max = (unsigned long *) table->extra2;
2307         vleft = table->maxlen / sizeof(unsigned long);
2308         left = *lenp;
2309         
2310         for (; left && vleft--; i++, min++, max++, first=0) {
2311                 if (write) {
2312                         while (left) {
2313                                 char c;
2314                                 if (get_user(c, s))
2315                                         return -EFAULT;
2316                                 if (!isspace(c))
2317                                         break;
2318                                 left--;
2319                                 s++;
2320                         }
2321                         if (!left)
2322                                 break;
2323                         neg = 0;
2324                         len = left;
2325                         if (len > TMPBUFLEN-1)
2326                                 len = TMPBUFLEN-1;
2327                         if (copy_from_user(buf, s, len))
2328                                 return -EFAULT;
2329                         buf[len] = 0;
2330                         p = buf;
2331                         if (*p == '-' && left > 1) {
2332                                 neg = 1;
2333                                 p++;
2334                         }
2335                         if (*p < '0' || *p > '9')
2336                                 break;
2337                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2338                         len = p-buf;
2339                         if ((len < left) && *p && !isspace(*p))
2340                                 break;
2341                         if (neg)
2342                                 val = -val;
2343                         s += len;
2344                         left -= len;
2345
2346                         if(neg)
2347                                 continue;
2348                         if ((min && val < *min) || (max && val > *max))
2349                                 continue;
2350                         *i = val;
2351                 } else {
2352                         p = buf;
2353                         if (!first)
2354                                 *p++ = '\t';
2355                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2356                         len = strlen(buf);
2357                         if (len > left)
2358                                 len = left;
2359                         if(copy_to_user(s, buf, len))
2360                                 return -EFAULT;
2361                         left -= len;
2362                         s += len;
2363                 }
2364         }
2365
2366         if (!write && !first && left) {
2367                 if(put_user('\n', s))
2368                         return -EFAULT;
2369                 left--, s++;
2370         }
2371         if (write) {
2372                 while (left) {
2373                         char c;
2374                         if (get_user(c, s++))
2375                                 return -EFAULT;
2376                         if (!isspace(c))
2377                                 break;
2378                         left--;
2379                 }
2380         }
2381         if (write && first)
2382                 return -EINVAL;
2383         *lenp -= left;
2384         *ppos += *lenp;
2385         return 0;
2386 #undef TMPBUFLEN
2387 }
2388
2389 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2390                                      void __user *buffer,
2391                                      size_t *lenp, loff_t *ppos,
2392                                      unsigned long convmul,
2393                                      unsigned long convdiv)
2394 {
2395         return __do_proc_doulongvec_minmax(table->data, table, write,
2396                         buffer, lenp, ppos, convmul, convdiv);
2397 }
2398
2399 /**
2400  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2401  * @table: the sysctl table
2402  * @write: %TRUE if this is a write to the sysctl file
2403  * @buffer: the user buffer
2404  * @lenp: the size of the user buffer
2405  * @ppos: file position
2406  *
2407  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2408  * values from/to the user buffer, treated as an ASCII string.
2409  *
2410  * This routine will ensure the values are within the range specified by
2411  * table->extra1 (min) and table->extra2 (max).
2412  *
2413  * Returns 0 on success.
2414  */
2415 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2416                            void __user *buffer, size_t *lenp, loff_t *ppos)
2417 {
2418     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2419 }
2420
2421 /**
2422  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2423  * @table: the sysctl table
2424  * @write: %TRUE if this is a write to the sysctl file
2425  * @buffer: the user buffer
2426  * @lenp: the size of the user buffer
2427  * @ppos: file position
2428  *
2429  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2430  * values from/to the user buffer, treated as an ASCII string. The values
2431  * are treated as milliseconds, and converted to jiffies when they are stored.
2432  *
2433  * This routine will ensure the values are within the range specified by
2434  * table->extra1 (min) and table->extra2 (max).
2435  *
2436  * Returns 0 on success.
2437  */
2438 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2439                                       void __user *buffer,
2440                                       size_t *lenp, loff_t *ppos)
2441 {
2442     return do_proc_doulongvec_minmax(table, write, buffer,
2443                                      lenp, ppos, HZ, 1000l);
2444 }
2445
2446
2447 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2448                                          int *valp,
2449                                          int write, void *data)
2450 {
2451         if (write) {
2452                 if (*lvalp > LONG_MAX / HZ)
2453                         return 1;
2454                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2455         } else {
2456                 int val = *valp;
2457                 unsigned long lval;
2458                 if (val < 0) {
2459                         *negp = -1;
2460                         lval = (unsigned long)-val;
2461                 } else {
2462                         *negp = 0;
2463                         lval = (unsigned long)val;
2464                 }
2465                 *lvalp = lval / HZ;
2466         }
2467         return 0;
2468 }
2469
2470 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2471                                                 int *valp,
2472                                                 int write, void *data)
2473 {
2474         if (write) {
2475                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2476                         return 1;
2477                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2478         } else {
2479                 int val = *valp;
2480                 unsigned long lval;
2481                 if (val < 0) {
2482                         *negp = -1;
2483                         lval = (unsigned long)-val;
2484                 } else {
2485                         *negp = 0;
2486                         lval = (unsigned long)val;
2487                 }
2488                 *lvalp = jiffies_to_clock_t(lval);
2489         }
2490         return 0;
2491 }
2492
2493 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2494                                             int *valp,
2495                                             int write, void *data)
2496 {
2497         if (write) {
2498                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2499         } else {
2500                 int val = *valp;
2501                 unsigned long lval;
2502                 if (val < 0) {
2503                         *negp = -1;
2504                         lval = (unsigned long)-val;
2505                 } else {
2506                         *negp = 0;
2507                         lval = (unsigned long)val;
2508                 }
2509                 *lvalp = jiffies_to_msecs(lval);
2510         }
2511         return 0;
2512 }
2513
2514 /**
2515  * proc_dointvec_jiffies - read a vector of integers as seconds
2516  * @table: the sysctl table
2517  * @write: %TRUE if this is a write to the sysctl file
2518  * @buffer: the user buffer
2519  * @lenp: the size of the user buffer
2520  * @ppos: file position
2521  *
2522  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2523  * values from/to the user buffer, treated as an ASCII string. 
2524  * The values read are assumed to be in seconds, and are converted into
2525  * jiffies.
2526  *
2527  * Returns 0 on success.
2528  */
2529 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2530                           void __user *buffer, size_t *lenp, loff_t *ppos)
2531 {
2532     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2533                             do_proc_dointvec_jiffies_conv,NULL);
2534 }
2535
2536 /**
2537  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2538  * @table: the sysctl table
2539  * @write: %TRUE if this is a write to the sysctl file
2540  * @buffer: the user buffer
2541  * @lenp: the size of the user buffer
2542  * @ppos: pointer to the file position
2543  *
2544  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2545  * values from/to the user buffer, treated as an ASCII string. 
2546  * The values read are assumed to be in 1/USER_HZ seconds, and 
2547  * are converted into jiffies.
2548  *
2549  * Returns 0 on success.
2550  */
2551 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2552                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2553 {
2554     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2555                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2556 }
2557
2558 /**
2559  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2560  * @table: the sysctl table
2561  * @write: %TRUE if this is a write to the sysctl file
2562  * @buffer: the user buffer
2563  * @lenp: the size of the user buffer
2564  * @ppos: file position
2565  * @ppos: the current position in the file
2566  *
2567  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2568  * values from/to the user buffer, treated as an ASCII string. 
2569  * The values read are assumed to be in 1/1000 seconds, and 
2570  * are converted into jiffies.
2571  *
2572  * Returns 0 on success.
2573  */
2574 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2575                              void __user *buffer, size_t *lenp, loff_t *ppos)
2576 {
2577         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2578                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2579 }
2580
2581 static int proc_do_cad_pid(struct ctl_table *table, int write,
2582                            void __user *buffer, size_t *lenp, loff_t *ppos)
2583 {
2584         struct pid *new_pid;
2585         pid_t tmp;
2586         int r;
2587
2588         tmp = pid_vnr(cad_pid);
2589
2590         r = __do_proc_dointvec(&tmp, table, write, buffer,
2591                                lenp, ppos, NULL, NULL);
2592         if (r || !write)
2593                 return r;
2594
2595         new_pid = find_get_pid(tmp);
2596         if (!new_pid)
2597                 return -ESRCH;
2598
2599         put_pid(xchg(&cad_pid, new_pid));
2600         return 0;
2601 }
2602
2603 #else /* CONFIG_PROC_FS */
2604
2605 int proc_dostring(struct ctl_table *table, int write,
2606                   void __user *buffer, size_t *lenp, loff_t *ppos)
2607 {
2608         return -ENOSYS;
2609 }
2610
2611 int proc_dointvec(struct ctl_table *table, int write,
2612                   void __user *buffer, size_t *lenp, loff_t *ppos)
2613 {
2614         return -ENOSYS;
2615 }
2616
2617 int proc_dointvec_minmax(struct ctl_table *table, int write,
2618                     void __user *buffer, size_t *lenp, loff_t *ppos)
2619 {
2620         return -ENOSYS;
2621 }
2622
2623 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2624                     void __user *buffer, size_t *lenp, loff_t *ppos)
2625 {
2626         return -ENOSYS;
2627 }
2628
2629 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2630                     void __user *buffer, size_t *lenp, loff_t *ppos)
2631 {
2632         return -ENOSYS;
2633 }
2634
2635 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2636                              void __user *buffer, size_t *lenp, loff_t *ppos)
2637 {
2638         return -ENOSYS;
2639 }
2640
2641 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2642                     void __user *buffer, size_t *lenp, loff_t *ppos)
2643 {
2644         return -ENOSYS;
2645 }
2646
2647 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2648                                       void __user *buffer,
2649                                       size_t *lenp, loff_t *ppos)
2650 {
2651     return -ENOSYS;
2652 }
2653
2654
2655 #endif /* CONFIG_PROC_FS */
2656
2657 int sysctl_data(struct ctl_table *table,
2658                   void __user *oldval, size_t __user *oldlenp,
2659                   void __user *newval, size_t newlen)
2660 {
2661         return -ENOSYS;
2662 }
2663
2664 int sysctl_string(struct ctl_table *table,
2665                   void __user *oldval, size_t __user *oldlenp,
2666                   void __user *newval, size_t newlen)
2667 {
2668         return -ENOSYS;
2669 }
2670
2671 int sysctl_intvec(struct ctl_table *table,
2672                 void __user *oldval, size_t __user *oldlenp,
2673                 void __user *newval, size_t newlen)
2674 {
2675         return -ENOSYS;
2676 }
2677
2678 int sysctl_jiffies(struct ctl_table *table,
2679                 void __user *oldval, size_t __user *oldlenp,
2680                 void __user *newval, size_t newlen)
2681 {
2682         return -ENOSYS;
2683 }
2684
2685 int sysctl_ms_jiffies(struct ctl_table *table,
2686                 void __user *oldval, size_t __user *oldlenp,
2687                 void __user *newval, size_t newlen)
2688 {
2689         return -ENOSYS;
2690 }
2691
2692 /*
2693  * No sense putting this after each symbol definition, twice,
2694  * exception granted :-)
2695  */
2696 EXPORT_SYMBOL(proc_dointvec);
2697 EXPORT_SYMBOL(proc_dointvec_jiffies);
2698 EXPORT_SYMBOL(proc_dointvec_minmax);
2699 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2700 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2701 EXPORT_SYMBOL(proc_dostring);
2702 EXPORT_SYMBOL(proc_doulongvec_minmax);
2703 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2704 EXPORT_SYMBOL(register_sysctl_table);
2705 EXPORT_SYMBOL(register_sysctl_paths);
2706 EXPORT_SYMBOL(sysctl_intvec);
2707 EXPORT_SYMBOL(sysctl_jiffies);
2708 EXPORT_SYMBOL(sysctl_ms_jiffies);
2709 EXPORT_SYMBOL(sysctl_string);
2710 EXPORT_SYMBOL(sysctl_data);
2711 EXPORT_SYMBOL(unregister_sysctl_table);