capabilities: introduce per-process capability bounding set
[linux-3.10.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/utsname.h>
30 #include <linux/smp_lock.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/security.h>
41 #include <linux/initrd.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
48 #include <linux/reboot.h>
49
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
52
53 #ifdef CONFIG_X86
54 #include <asm/nmi.h>
55 #include <asm/stacktrace.h>
56 #include <asm/io.h>
57 #endif
58
59 static int deprecated_sysctl_warning(struct __sysctl_args *args);
60
61 #if defined(CONFIG_SYSCTL)
62
63 /* External variables not in a header file. */
64 extern int C_A_D;
65 extern int print_fatal_signals;
66 extern int sysctl_overcommit_memory;
67 extern int sysctl_overcommit_ratio;
68 extern int sysctl_panic_on_oom;
69 extern int sysctl_oom_kill_allocating_task;
70 extern int max_threads;
71 extern int core_uses_pid;
72 extern int suid_dumpable;
73 extern char core_pattern[];
74 extern int pid_max;
75 extern int min_free_kbytes;
76 extern int printk_ratelimit_jiffies;
77 extern int printk_ratelimit_burst;
78 extern int pid_max_min, pid_max_max;
79 extern int sysctl_drop_caches;
80 extern int percpu_pagelist_fraction;
81 extern int compat_log;
82 extern int maps_protect;
83 extern int sysctl_stat_interval;
84 extern int latencytop_enabled;
85
86 /* Constants used for minimum and  maximum */
87 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
88 static int one = 1;
89 #endif
90
91 #ifdef CONFIG_DETECT_SOFTLOCKUP
92 static int sixty = 60;
93 #endif
94
95 #ifdef CONFIG_MMU
96 static int two = 2;
97 #endif
98
99 static int zero;
100 static int one_hundred = 100;
101
102 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
103 static int maxolduid = 65535;
104 static int minolduid;
105 static int min_percpu_pagelist_fract = 8;
106
107 static int ngroups_max = NGROUPS_MAX;
108
109 #ifdef CONFIG_KMOD
110 extern char modprobe_path[];
111 #endif
112 #ifdef CONFIG_CHR_DEV_SG
113 extern int sg_big_buff;
114 #endif
115
116 #ifdef __sparc__
117 extern char reboot_command [];
118 extern int stop_a_enabled;
119 extern int scons_pwroff;
120 #endif
121
122 #ifdef __hppa__
123 extern int pwrsw_enabled;
124 extern int unaligned_enabled;
125 #endif
126
127 #ifdef CONFIG_S390
128 #ifdef CONFIG_MATHEMU
129 extern int sysctl_ieee_emulation_warnings;
130 #endif
131 extern int sysctl_userprocess_debug;
132 extern int spin_retry;
133 #endif
134
135 extern int sysctl_hz_timer;
136
137 #ifdef CONFIG_BSD_PROCESS_ACCT
138 extern int acct_parm[];
139 #endif
140
141 #ifdef CONFIG_IA64
142 extern int no_unaligned_warning;
143 #endif
144
145 #ifdef CONFIG_RT_MUTEXES
146 extern int max_lock_depth;
147 #endif
148
149 #ifdef CONFIG_SYSCTL_SYSCALL
150 static int parse_table(int __user *, int, void __user *, size_t __user *,
151                 void __user *, size_t, struct ctl_table *);
152 #endif
153
154
155 #ifdef CONFIG_PROC_SYSCTL
156 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
157                   void __user *buffer, size_t *lenp, loff_t *ppos);
158 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
159                                void __user *buffer, size_t *lenp, loff_t *ppos);
160 #endif
161
162 static struct ctl_table root_table[];
163 static struct ctl_table_root sysctl_table_root;
164 static struct ctl_table_header root_table_header = {
165         .ctl_table = root_table,
166         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
167         .root = &sysctl_table_root,
168 };
169 static struct ctl_table_root sysctl_table_root = {
170         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
171         .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
172 };
173
174 static struct ctl_table kern_table[];
175 static struct ctl_table vm_table[];
176 static struct ctl_table fs_table[];
177 static struct ctl_table debug_table[];
178 static struct ctl_table dev_table[];
179 extern struct ctl_table random_table[];
180 #ifdef CONFIG_INOTIFY_USER
181 extern struct ctl_table inotify_table[];
182 #endif
183
184 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
185 int sysctl_legacy_va_layout;
186 #endif
187
188 extern int prove_locking;
189 extern int lock_stat;
190
191 /* The default sysctl tables: */
192
193 static struct ctl_table root_table[] = {
194         {
195                 .ctl_name       = CTL_KERN,
196                 .procname       = "kernel",
197                 .mode           = 0555,
198                 .child          = kern_table,
199         },
200         {
201                 .ctl_name       = CTL_VM,
202                 .procname       = "vm",
203                 .mode           = 0555,
204                 .child          = vm_table,
205         },
206         {
207                 .ctl_name       = CTL_FS,
208                 .procname       = "fs",
209                 .mode           = 0555,
210                 .child          = fs_table,
211         },
212         {
213                 .ctl_name       = CTL_DEBUG,
214                 .procname       = "debug",
215                 .mode           = 0555,
216                 .child          = debug_table,
217         },
218         {
219                 .ctl_name       = CTL_DEV,
220                 .procname       = "dev",
221                 .mode           = 0555,
222                 .child          = dev_table,
223         },
224 /*
225  * NOTE: do not add new entries to this table unless you have read
226  * Documentation/sysctl/ctl_unnumbered.txt
227  */
228         { .ctl_name = 0 }
229 };
230
231 #ifdef CONFIG_SCHED_DEBUG
232 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
233 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
234 static int min_wakeup_granularity_ns;                   /* 0 usecs */
235 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
236 #endif
237
238 static struct ctl_table kern_table[] = {
239 #ifdef CONFIG_SCHED_DEBUG
240         {
241                 .ctl_name       = CTL_UNNUMBERED,
242                 .procname       = "sched_min_granularity_ns",
243                 .data           = &sysctl_sched_min_granularity,
244                 .maxlen         = sizeof(unsigned int),
245                 .mode           = 0644,
246                 .proc_handler   = &sched_nr_latency_handler,
247                 .strategy       = &sysctl_intvec,
248                 .extra1         = &min_sched_granularity_ns,
249                 .extra2         = &max_sched_granularity_ns,
250         },
251         {
252                 .ctl_name       = CTL_UNNUMBERED,
253                 .procname       = "sched_latency_ns",
254                 .data           = &sysctl_sched_latency,
255                 .maxlen         = sizeof(unsigned int),
256                 .mode           = 0644,
257                 .proc_handler   = &sched_nr_latency_handler,
258                 .strategy       = &sysctl_intvec,
259                 .extra1         = &min_sched_granularity_ns,
260                 .extra2         = &max_sched_granularity_ns,
261         },
262         {
263                 .ctl_name       = CTL_UNNUMBERED,
264                 .procname       = "sched_wakeup_granularity_ns",
265                 .data           = &sysctl_sched_wakeup_granularity,
266                 .maxlen         = sizeof(unsigned int),
267                 .mode           = 0644,
268                 .proc_handler   = &proc_dointvec_minmax,
269                 .strategy       = &sysctl_intvec,
270                 .extra1         = &min_wakeup_granularity_ns,
271                 .extra2         = &max_wakeup_granularity_ns,
272         },
273         {
274                 .ctl_name       = CTL_UNNUMBERED,
275                 .procname       = "sched_batch_wakeup_granularity_ns",
276                 .data           = &sysctl_sched_batch_wakeup_granularity,
277                 .maxlen         = sizeof(unsigned int),
278                 .mode           = 0644,
279                 .proc_handler   = &proc_dointvec_minmax,
280                 .strategy       = &sysctl_intvec,
281                 .extra1         = &min_wakeup_granularity_ns,
282                 .extra2         = &max_wakeup_granularity_ns,
283         },
284         {
285                 .ctl_name       = CTL_UNNUMBERED,
286                 .procname       = "sched_child_runs_first",
287                 .data           = &sysctl_sched_child_runs_first,
288                 .maxlen         = sizeof(unsigned int),
289                 .mode           = 0644,
290                 .proc_handler   = &proc_dointvec,
291         },
292         {
293                 .ctl_name       = CTL_UNNUMBERED,
294                 .procname       = "sched_features",
295                 .data           = &sysctl_sched_features,
296                 .maxlen         = sizeof(unsigned int),
297                 .mode           = 0644,
298                 .proc_handler   = &proc_dointvec,
299         },
300         {
301                 .ctl_name       = CTL_UNNUMBERED,
302                 .procname       = "sched_migration_cost",
303                 .data           = &sysctl_sched_migration_cost,
304                 .maxlen         = sizeof(unsigned int),
305                 .mode           = 0644,
306                 .proc_handler   = &proc_dointvec,
307         },
308         {
309                 .ctl_name       = CTL_UNNUMBERED,
310                 .procname       = "sched_nr_migrate",
311                 .data           = &sysctl_sched_nr_migrate,
312                 .maxlen         = sizeof(unsigned int),
313                 .mode           = 0644,
314                 .proc_handler   = &proc_dointvec,
315         },
316         {
317                 .ctl_name       = CTL_UNNUMBERED,
318                 .procname       = "sched_rt_period_ms",
319                 .data           = &sysctl_sched_rt_period,
320                 .maxlen         = sizeof(unsigned int),
321                 .mode           = 0644,
322                 .proc_handler   = &proc_dointvec,
323         },
324         {
325                 .ctl_name       = CTL_UNNUMBERED,
326                 .procname       = "sched_rt_ratio",
327                 .data           = &sysctl_sched_rt_ratio,
328                 .maxlen         = sizeof(unsigned int),
329                 .mode           = 0644,
330                 .proc_handler   = &proc_dointvec,
331         },
332 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
333         {
334                 .ctl_name       = CTL_UNNUMBERED,
335                 .procname       = "sched_min_bal_int_shares",
336                 .data           = &sysctl_sched_min_bal_int_shares,
337                 .maxlen         = sizeof(unsigned int),
338                 .mode           = 0644,
339                 .proc_handler   = &proc_dointvec,
340         },
341         {
342                 .ctl_name       = CTL_UNNUMBERED,
343                 .procname       = "sched_max_bal_int_shares",
344                 .data           = &sysctl_sched_max_bal_int_shares,
345                 .maxlen         = sizeof(unsigned int),
346                 .mode           = 0644,
347                 .proc_handler   = &proc_dointvec,
348         },
349 #endif
350 #endif
351         {
352                 .ctl_name       = CTL_UNNUMBERED,
353                 .procname       = "sched_compat_yield",
354                 .data           = &sysctl_sched_compat_yield,
355                 .maxlen         = sizeof(unsigned int),
356                 .mode           = 0644,
357                 .proc_handler   = &proc_dointvec,
358         },
359 #ifdef CONFIG_PROVE_LOCKING
360         {
361                 .ctl_name       = CTL_UNNUMBERED,
362                 .procname       = "prove_locking",
363                 .data           = &prove_locking,
364                 .maxlen         = sizeof(int),
365                 .mode           = 0644,
366                 .proc_handler   = &proc_dointvec,
367         },
368 #endif
369 #ifdef CONFIG_LOCK_STAT
370         {
371                 .ctl_name       = CTL_UNNUMBERED,
372                 .procname       = "lock_stat",
373                 .data           = &lock_stat,
374                 .maxlen         = sizeof(int),
375                 .mode           = 0644,
376                 .proc_handler   = &proc_dointvec,
377         },
378 #endif
379         {
380                 .ctl_name       = KERN_PANIC,
381                 .procname       = "panic",
382                 .data           = &panic_timeout,
383                 .maxlen         = sizeof(int),
384                 .mode           = 0644,
385                 .proc_handler   = &proc_dointvec,
386         },
387         {
388                 .ctl_name       = KERN_CORE_USES_PID,
389                 .procname       = "core_uses_pid",
390                 .data           = &core_uses_pid,
391                 .maxlen         = sizeof(int),
392                 .mode           = 0644,
393                 .proc_handler   = &proc_dointvec,
394         },
395         {
396                 .ctl_name       = KERN_CORE_PATTERN,
397                 .procname       = "core_pattern",
398                 .data           = core_pattern,
399                 .maxlen         = CORENAME_MAX_SIZE,
400                 .mode           = 0644,
401                 .proc_handler   = &proc_dostring,
402                 .strategy       = &sysctl_string,
403         },
404 #ifdef CONFIG_PROC_SYSCTL
405         {
406                 .procname       = "tainted",
407                 .data           = &tainted,
408                 .maxlen         = sizeof(int),
409                 .mode           = 0644,
410                 .proc_handler   = &proc_dointvec_taint,
411         },
412 #endif
413 #ifdef CONFIG_LATENCYTOP
414         {
415                 .procname       = "latencytop",
416                 .data           = &latencytop_enabled,
417                 .maxlen         = sizeof(int),
418                 .mode           = 0644,
419                 .proc_handler   = &proc_dointvec,
420         },
421 #endif
422 #ifdef CONFIG_BLK_DEV_INITRD
423         {
424                 .ctl_name       = KERN_REALROOTDEV,
425                 .procname       = "real-root-dev",
426                 .data           = &real_root_dev,
427                 .maxlen         = sizeof(int),
428                 .mode           = 0644,
429                 .proc_handler   = &proc_dointvec,
430         },
431 #endif
432         {
433                 .ctl_name       = CTL_UNNUMBERED,
434                 .procname       = "print-fatal-signals",
435                 .data           = &print_fatal_signals,
436                 .maxlen         = sizeof(int),
437                 .mode           = 0644,
438                 .proc_handler   = &proc_dointvec,
439         },
440 #ifdef __sparc__
441         {
442                 .ctl_name       = KERN_SPARC_REBOOT,
443                 .procname       = "reboot-cmd",
444                 .data           = reboot_command,
445                 .maxlen         = 256,
446                 .mode           = 0644,
447                 .proc_handler   = &proc_dostring,
448                 .strategy       = &sysctl_string,
449         },
450         {
451                 .ctl_name       = KERN_SPARC_STOP_A,
452                 .procname       = "stop-a",
453                 .data           = &stop_a_enabled,
454                 .maxlen         = sizeof (int),
455                 .mode           = 0644,
456                 .proc_handler   = &proc_dointvec,
457         },
458         {
459                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
460                 .procname       = "scons-poweroff",
461                 .data           = &scons_pwroff,
462                 .maxlen         = sizeof (int),
463                 .mode           = 0644,
464                 .proc_handler   = &proc_dointvec,
465         },
466 #endif
467 #ifdef __hppa__
468         {
469                 .ctl_name       = KERN_HPPA_PWRSW,
470                 .procname       = "soft-power",
471                 .data           = &pwrsw_enabled,
472                 .maxlen         = sizeof (int),
473                 .mode           = 0644,
474                 .proc_handler   = &proc_dointvec,
475         },
476         {
477                 .ctl_name       = KERN_HPPA_UNALIGNED,
478                 .procname       = "unaligned-trap",
479                 .data           = &unaligned_enabled,
480                 .maxlen         = sizeof (int),
481                 .mode           = 0644,
482                 .proc_handler   = &proc_dointvec,
483         },
484 #endif
485         {
486                 .ctl_name       = KERN_CTLALTDEL,
487                 .procname       = "ctrl-alt-del",
488                 .data           = &C_A_D,
489                 .maxlen         = sizeof(int),
490                 .mode           = 0644,
491                 .proc_handler   = &proc_dointvec,
492         },
493         {
494                 .ctl_name       = KERN_PRINTK,
495                 .procname       = "printk",
496                 .data           = &console_loglevel,
497                 .maxlen         = 4*sizeof(int),
498                 .mode           = 0644,
499                 .proc_handler   = &proc_dointvec,
500         },
501 #ifdef CONFIG_KMOD
502         {
503                 .ctl_name       = KERN_MODPROBE,
504                 .procname       = "modprobe",
505                 .data           = &modprobe_path,
506                 .maxlen         = KMOD_PATH_LEN,
507                 .mode           = 0644,
508                 .proc_handler   = &proc_dostring,
509                 .strategy       = &sysctl_string,
510         },
511 #endif
512 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
513         {
514                 .ctl_name       = KERN_HOTPLUG,
515                 .procname       = "hotplug",
516                 .data           = &uevent_helper,
517                 .maxlen         = UEVENT_HELPER_PATH_LEN,
518                 .mode           = 0644,
519                 .proc_handler   = &proc_dostring,
520                 .strategy       = &sysctl_string,
521         },
522 #endif
523 #ifdef CONFIG_CHR_DEV_SG
524         {
525                 .ctl_name       = KERN_SG_BIG_BUFF,
526                 .procname       = "sg-big-buff",
527                 .data           = &sg_big_buff,
528                 .maxlen         = sizeof (int),
529                 .mode           = 0444,
530                 .proc_handler   = &proc_dointvec,
531         },
532 #endif
533 #ifdef CONFIG_BSD_PROCESS_ACCT
534         {
535                 .ctl_name       = KERN_ACCT,
536                 .procname       = "acct",
537                 .data           = &acct_parm,
538                 .maxlen         = 3*sizeof(int),
539                 .mode           = 0644,
540                 .proc_handler   = &proc_dointvec,
541         },
542 #endif
543 #ifdef CONFIG_MAGIC_SYSRQ
544         {
545                 .ctl_name       = KERN_SYSRQ,
546                 .procname       = "sysrq",
547                 .data           = &__sysrq_enabled,
548                 .maxlen         = sizeof (int),
549                 .mode           = 0644,
550                 .proc_handler   = &proc_dointvec,
551         },
552 #endif
553 #ifdef CONFIG_PROC_SYSCTL
554         {
555                 .procname       = "cad_pid",
556                 .data           = NULL,
557                 .maxlen         = sizeof (int),
558                 .mode           = 0600,
559                 .proc_handler   = &proc_do_cad_pid,
560         },
561 #endif
562         {
563                 .ctl_name       = KERN_MAX_THREADS,
564                 .procname       = "threads-max",
565                 .data           = &max_threads,
566                 .maxlen         = sizeof(int),
567                 .mode           = 0644,
568                 .proc_handler   = &proc_dointvec,
569         },
570         {
571                 .ctl_name       = KERN_RANDOM,
572                 .procname       = "random",
573                 .mode           = 0555,
574                 .child          = random_table,
575         },
576         {
577                 .ctl_name       = KERN_OVERFLOWUID,
578                 .procname       = "overflowuid",
579                 .data           = &overflowuid,
580                 .maxlen         = sizeof(int),
581                 .mode           = 0644,
582                 .proc_handler   = &proc_dointvec_minmax,
583                 .strategy       = &sysctl_intvec,
584                 .extra1         = &minolduid,
585                 .extra2         = &maxolduid,
586         },
587         {
588                 .ctl_name       = KERN_OVERFLOWGID,
589                 .procname       = "overflowgid",
590                 .data           = &overflowgid,
591                 .maxlen         = sizeof(int),
592                 .mode           = 0644,
593                 .proc_handler   = &proc_dointvec_minmax,
594                 .strategy       = &sysctl_intvec,
595                 .extra1         = &minolduid,
596                 .extra2         = &maxolduid,
597         },
598 #ifdef CONFIG_S390
599 #ifdef CONFIG_MATHEMU
600         {
601                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
602                 .procname       = "ieee_emulation_warnings",
603                 .data           = &sysctl_ieee_emulation_warnings,
604                 .maxlen         = sizeof(int),
605                 .mode           = 0644,
606                 .proc_handler   = &proc_dointvec,
607         },
608 #endif
609 #ifdef CONFIG_NO_IDLE_HZ
610         {
611                 .ctl_name       = KERN_HZ_TIMER,
612                 .procname       = "hz_timer",
613                 .data           = &sysctl_hz_timer,
614                 .maxlen         = sizeof(int),
615                 .mode           = 0644,
616                 .proc_handler   = &proc_dointvec,
617         },
618 #endif
619         {
620                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
621                 .procname       = "userprocess_debug",
622                 .data           = &sysctl_userprocess_debug,
623                 .maxlen         = sizeof(int),
624                 .mode           = 0644,
625                 .proc_handler   = &proc_dointvec,
626         },
627 #endif
628         {
629                 .ctl_name       = KERN_PIDMAX,
630                 .procname       = "pid_max",
631                 .data           = &pid_max,
632                 .maxlen         = sizeof (int),
633                 .mode           = 0644,
634                 .proc_handler   = &proc_dointvec_minmax,
635                 .strategy       = sysctl_intvec,
636                 .extra1         = &pid_max_min,
637                 .extra2         = &pid_max_max,
638         },
639         {
640                 .ctl_name       = KERN_PANIC_ON_OOPS,
641                 .procname       = "panic_on_oops",
642                 .data           = &panic_on_oops,
643                 .maxlen         = sizeof(int),
644                 .mode           = 0644,
645                 .proc_handler   = &proc_dointvec,
646         },
647         {
648                 .ctl_name       = KERN_PRINTK_RATELIMIT,
649                 .procname       = "printk_ratelimit",
650                 .data           = &printk_ratelimit_jiffies,
651                 .maxlen         = sizeof(int),
652                 .mode           = 0644,
653                 .proc_handler   = &proc_dointvec_jiffies,
654                 .strategy       = &sysctl_jiffies,
655         },
656         {
657                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
658                 .procname       = "printk_ratelimit_burst",
659                 .data           = &printk_ratelimit_burst,
660                 .maxlen         = sizeof(int),
661                 .mode           = 0644,
662                 .proc_handler   = &proc_dointvec,
663         },
664         {
665                 .ctl_name       = KERN_NGROUPS_MAX,
666                 .procname       = "ngroups_max",
667                 .data           = &ngroups_max,
668                 .maxlen         = sizeof (int),
669                 .mode           = 0444,
670                 .proc_handler   = &proc_dointvec,
671         },
672 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
673         {
674                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
675                 .procname       = "unknown_nmi_panic",
676                 .data           = &unknown_nmi_panic,
677                 .maxlen         = sizeof (int),
678                 .mode           = 0644,
679                 .proc_handler   = &proc_dointvec,
680         },
681         {
682                 .procname       = "nmi_watchdog",
683                 .data           = &nmi_watchdog_enabled,
684                 .maxlen         = sizeof (int),
685                 .mode           = 0644,
686                 .proc_handler   = &proc_nmi_enabled,
687         },
688 #endif
689 #if defined(CONFIG_X86)
690         {
691                 .ctl_name       = KERN_PANIC_ON_NMI,
692                 .procname       = "panic_on_unrecovered_nmi",
693                 .data           = &panic_on_unrecovered_nmi,
694                 .maxlen         = sizeof(int),
695                 .mode           = 0644,
696                 .proc_handler   = &proc_dointvec,
697         },
698         {
699                 .ctl_name       = KERN_BOOTLOADER_TYPE,
700                 .procname       = "bootloader_type",
701                 .data           = &bootloader_type,
702                 .maxlen         = sizeof (int),
703                 .mode           = 0444,
704                 .proc_handler   = &proc_dointvec,
705         },
706         {
707                 .ctl_name       = CTL_UNNUMBERED,
708                 .procname       = "kstack_depth_to_print",
709                 .data           = &kstack_depth_to_print,
710                 .maxlen         = sizeof(int),
711                 .mode           = 0644,
712                 .proc_handler   = &proc_dointvec,
713         },
714         {
715                 .ctl_name       = CTL_UNNUMBERED,
716                 .procname       = "io_delay_type",
717                 .data           = &io_delay_type,
718                 .maxlen         = sizeof(int),
719                 .mode           = 0644,
720                 .proc_handler   = &proc_dointvec,
721         },
722 #endif
723 #if defined(CONFIG_MMU)
724         {
725                 .ctl_name       = KERN_RANDOMIZE,
726                 .procname       = "randomize_va_space",
727                 .data           = &randomize_va_space,
728                 .maxlen         = sizeof(int),
729                 .mode           = 0644,
730                 .proc_handler   = &proc_dointvec,
731         },
732 #endif
733 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
734         {
735                 .ctl_name       = KERN_SPIN_RETRY,
736                 .procname       = "spin_retry",
737                 .data           = &spin_retry,
738                 .maxlen         = sizeof (int),
739                 .mode           = 0644,
740                 .proc_handler   = &proc_dointvec,
741         },
742 #endif
743 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
744         {
745                 .procname       = "acpi_video_flags",
746                 .data           = &acpi_realmode_flags,
747                 .maxlen         = sizeof (unsigned long),
748                 .mode           = 0644,
749                 .proc_handler   = &proc_doulongvec_minmax,
750         },
751 #endif
752 #ifdef CONFIG_IA64
753         {
754                 .ctl_name       = KERN_IA64_UNALIGNED,
755                 .procname       = "ignore-unaligned-usertrap",
756                 .data           = &no_unaligned_warning,
757                 .maxlen         = sizeof (int),
758                 .mode           = 0644,
759                 .proc_handler   = &proc_dointvec,
760         },
761 #endif
762 #ifdef CONFIG_DETECT_SOFTLOCKUP
763         {
764                 .ctl_name       = CTL_UNNUMBERED,
765                 .procname       = "softlockup_thresh",
766                 .data           = &softlockup_thresh,
767                 .maxlen         = sizeof(unsigned long),
768                 .mode           = 0644,
769                 .proc_handler   = &proc_doulongvec_minmax,
770                 .strategy       = &sysctl_intvec,
771                 .extra1         = &one,
772                 .extra2         = &sixty,
773         },
774         {
775                 .ctl_name       = CTL_UNNUMBERED,
776                 .procname       = "hung_task_check_count",
777                 .data           = &sysctl_hung_task_check_count,
778                 .maxlen         = sizeof(unsigned long),
779                 .mode           = 0644,
780                 .proc_handler   = &proc_doulongvec_minmax,
781                 .strategy       = &sysctl_intvec,
782         },
783         {
784                 .ctl_name       = CTL_UNNUMBERED,
785                 .procname       = "hung_task_timeout_secs",
786                 .data           = &sysctl_hung_task_timeout_secs,
787                 .maxlen         = sizeof(unsigned long),
788                 .mode           = 0644,
789                 .proc_handler   = &proc_doulongvec_minmax,
790                 .strategy       = &sysctl_intvec,
791         },
792         {
793                 .ctl_name       = CTL_UNNUMBERED,
794                 .procname       = "hung_task_warnings",
795                 .data           = &sysctl_hung_task_warnings,
796                 .maxlen         = sizeof(unsigned long),
797                 .mode           = 0644,
798                 .proc_handler   = &proc_doulongvec_minmax,
799                 .strategy       = &sysctl_intvec,
800         },
801 #endif
802 #ifdef CONFIG_COMPAT
803         {
804                 .ctl_name       = KERN_COMPAT_LOG,
805                 .procname       = "compat-log",
806                 .data           = &compat_log,
807                 .maxlen         = sizeof (int),
808                 .mode           = 0644,
809                 .proc_handler   = &proc_dointvec,
810         },
811 #endif
812 #ifdef CONFIG_RT_MUTEXES
813         {
814                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
815                 .procname       = "max_lock_depth",
816                 .data           = &max_lock_depth,
817                 .maxlen         = sizeof(int),
818                 .mode           = 0644,
819                 .proc_handler   = &proc_dointvec,
820         },
821 #endif
822 #ifdef CONFIG_PROC_FS
823         {
824                 .ctl_name       = CTL_UNNUMBERED,
825                 .procname       = "maps_protect",
826                 .data           = &maps_protect,
827                 .maxlen         = sizeof(int),
828                 .mode           = 0644,
829                 .proc_handler   = &proc_dointvec,
830         },
831 #endif
832         {
833                 .ctl_name       = CTL_UNNUMBERED,
834                 .procname       = "poweroff_cmd",
835                 .data           = &poweroff_cmd,
836                 .maxlen         = POWEROFF_CMD_PATH_LEN,
837                 .mode           = 0644,
838                 .proc_handler   = &proc_dostring,
839                 .strategy       = &sysctl_string,
840         },
841 /*
842  * NOTE: do not add new entries to this table unless you have read
843  * Documentation/sysctl/ctl_unnumbered.txt
844  */
845         { .ctl_name = 0 }
846 };
847
848 static struct ctl_table vm_table[] = {
849         {
850                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
851                 .procname       = "overcommit_memory",
852                 .data           = &sysctl_overcommit_memory,
853                 .maxlen         = sizeof(sysctl_overcommit_memory),
854                 .mode           = 0644,
855                 .proc_handler   = &proc_dointvec,
856         },
857         {
858                 .ctl_name       = VM_PANIC_ON_OOM,
859                 .procname       = "panic_on_oom",
860                 .data           = &sysctl_panic_on_oom,
861                 .maxlen         = sizeof(sysctl_panic_on_oom),
862                 .mode           = 0644,
863                 .proc_handler   = &proc_dointvec,
864         },
865         {
866                 .ctl_name       = CTL_UNNUMBERED,
867                 .procname       = "oom_kill_allocating_task",
868                 .data           = &sysctl_oom_kill_allocating_task,
869                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
870                 .mode           = 0644,
871                 .proc_handler   = &proc_dointvec,
872         },
873         {
874                 .ctl_name       = VM_OVERCOMMIT_RATIO,
875                 .procname       = "overcommit_ratio",
876                 .data           = &sysctl_overcommit_ratio,
877                 .maxlen         = sizeof(sysctl_overcommit_ratio),
878                 .mode           = 0644,
879                 .proc_handler   = &proc_dointvec,
880         },
881         {
882                 .ctl_name       = VM_PAGE_CLUSTER,
883                 .procname       = "page-cluster", 
884                 .data           = &page_cluster,
885                 .maxlen         = sizeof(int),
886                 .mode           = 0644,
887                 .proc_handler   = &proc_dointvec,
888         },
889         {
890                 .ctl_name       = VM_DIRTY_BACKGROUND,
891                 .procname       = "dirty_background_ratio",
892                 .data           = &dirty_background_ratio,
893                 .maxlen         = sizeof(dirty_background_ratio),
894                 .mode           = 0644,
895                 .proc_handler   = &proc_dointvec_minmax,
896                 .strategy       = &sysctl_intvec,
897                 .extra1         = &zero,
898                 .extra2         = &one_hundred,
899         },
900         {
901                 .ctl_name       = VM_DIRTY_RATIO,
902                 .procname       = "dirty_ratio",
903                 .data           = &vm_dirty_ratio,
904                 .maxlen         = sizeof(vm_dirty_ratio),
905                 .mode           = 0644,
906                 .proc_handler   = &dirty_ratio_handler,
907                 .strategy       = &sysctl_intvec,
908                 .extra1         = &zero,
909                 .extra2         = &one_hundred,
910         },
911         {
912                 .procname       = "dirty_writeback_centisecs",
913                 .data           = &dirty_writeback_interval,
914                 .maxlen         = sizeof(dirty_writeback_interval),
915                 .mode           = 0644,
916                 .proc_handler   = &dirty_writeback_centisecs_handler,
917         },
918         {
919                 .procname       = "dirty_expire_centisecs",
920                 .data           = &dirty_expire_interval,
921                 .maxlen         = sizeof(dirty_expire_interval),
922                 .mode           = 0644,
923                 .proc_handler   = &proc_dointvec_userhz_jiffies,
924         },
925         {
926                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
927                 .procname       = "nr_pdflush_threads",
928                 .data           = &nr_pdflush_threads,
929                 .maxlen         = sizeof nr_pdflush_threads,
930                 .mode           = 0444 /* read-only*/,
931                 .proc_handler   = &proc_dointvec,
932         },
933         {
934                 .ctl_name       = VM_SWAPPINESS,
935                 .procname       = "swappiness",
936                 .data           = &vm_swappiness,
937                 .maxlen         = sizeof(vm_swappiness),
938                 .mode           = 0644,
939                 .proc_handler   = &proc_dointvec_minmax,
940                 .strategy       = &sysctl_intvec,
941                 .extra1         = &zero,
942                 .extra2         = &one_hundred,
943         },
944 #ifdef CONFIG_HUGETLB_PAGE
945          {
946                 .procname       = "nr_hugepages",
947                 .data           = &max_huge_pages,
948                 .maxlen         = sizeof(unsigned long),
949                 .mode           = 0644,
950                 .proc_handler   = &hugetlb_sysctl_handler,
951                 .extra1         = (void *)&hugetlb_zero,
952                 .extra2         = (void *)&hugetlb_infinity,
953          },
954          {
955                 .ctl_name       = VM_HUGETLB_GROUP,
956                 .procname       = "hugetlb_shm_group",
957                 .data           = &sysctl_hugetlb_shm_group,
958                 .maxlen         = sizeof(gid_t),
959                 .mode           = 0644,
960                 .proc_handler   = &proc_dointvec,
961          },
962          {
963                 .ctl_name       = CTL_UNNUMBERED,
964                 .procname       = "hugepages_treat_as_movable",
965                 .data           = &hugepages_treat_as_movable,
966                 .maxlen         = sizeof(int),
967                 .mode           = 0644,
968                 .proc_handler   = &hugetlb_treat_movable_handler,
969         },
970         {
971                 .ctl_name       = CTL_UNNUMBERED,
972                 .procname       = "nr_overcommit_hugepages",
973                 .data           = &nr_overcommit_huge_pages,
974                 .maxlen         = sizeof(nr_overcommit_huge_pages),
975                 .mode           = 0644,
976                 .proc_handler   = &proc_doulongvec_minmax,
977         },
978 #endif
979         {
980                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
981                 .procname       = "lowmem_reserve_ratio",
982                 .data           = &sysctl_lowmem_reserve_ratio,
983                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
984                 .mode           = 0644,
985                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
986                 .strategy       = &sysctl_intvec,
987         },
988         {
989                 .ctl_name       = VM_DROP_PAGECACHE,
990                 .procname       = "drop_caches",
991                 .data           = &sysctl_drop_caches,
992                 .maxlen         = sizeof(int),
993                 .mode           = 0644,
994                 .proc_handler   = drop_caches_sysctl_handler,
995                 .strategy       = &sysctl_intvec,
996         },
997         {
998                 .ctl_name       = VM_MIN_FREE_KBYTES,
999                 .procname       = "min_free_kbytes",
1000                 .data           = &min_free_kbytes,
1001                 .maxlen         = sizeof(min_free_kbytes),
1002                 .mode           = 0644,
1003                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1004                 .strategy       = &sysctl_intvec,
1005                 .extra1         = &zero,
1006         },
1007         {
1008                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1009                 .procname       = "percpu_pagelist_fraction",
1010                 .data           = &percpu_pagelist_fraction,
1011                 .maxlen         = sizeof(percpu_pagelist_fraction),
1012                 .mode           = 0644,
1013                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1014                 .strategy       = &sysctl_intvec,
1015                 .extra1         = &min_percpu_pagelist_fract,
1016         },
1017 #ifdef CONFIG_MMU
1018         {
1019                 .ctl_name       = VM_MAX_MAP_COUNT,
1020                 .procname       = "max_map_count",
1021                 .data           = &sysctl_max_map_count,
1022                 .maxlen         = sizeof(sysctl_max_map_count),
1023                 .mode           = 0644,
1024                 .proc_handler   = &proc_dointvec
1025         },
1026 #endif
1027         {
1028                 .ctl_name       = VM_LAPTOP_MODE,
1029                 .procname       = "laptop_mode",
1030                 .data           = &laptop_mode,
1031                 .maxlen         = sizeof(laptop_mode),
1032                 .mode           = 0644,
1033                 .proc_handler   = &proc_dointvec_jiffies,
1034                 .strategy       = &sysctl_jiffies,
1035         },
1036         {
1037                 .ctl_name       = VM_BLOCK_DUMP,
1038                 .procname       = "block_dump",
1039                 .data           = &block_dump,
1040                 .maxlen         = sizeof(block_dump),
1041                 .mode           = 0644,
1042                 .proc_handler   = &proc_dointvec,
1043                 .strategy       = &sysctl_intvec,
1044                 .extra1         = &zero,
1045         },
1046         {
1047                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1048                 .procname       = "vfs_cache_pressure",
1049                 .data           = &sysctl_vfs_cache_pressure,
1050                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1051                 .mode           = 0644,
1052                 .proc_handler   = &proc_dointvec,
1053                 .strategy       = &sysctl_intvec,
1054                 .extra1         = &zero,
1055         },
1056 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1057         {
1058                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1059                 .procname       = "legacy_va_layout",
1060                 .data           = &sysctl_legacy_va_layout,
1061                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1062                 .mode           = 0644,
1063                 .proc_handler   = &proc_dointvec,
1064                 .strategy       = &sysctl_intvec,
1065                 .extra1         = &zero,
1066         },
1067 #endif
1068 #ifdef CONFIG_NUMA
1069         {
1070                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1071                 .procname       = "zone_reclaim_mode",
1072                 .data           = &zone_reclaim_mode,
1073                 .maxlen         = sizeof(zone_reclaim_mode),
1074                 .mode           = 0644,
1075                 .proc_handler   = &proc_dointvec,
1076                 .strategy       = &sysctl_intvec,
1077                 .extra1         = &zero,
1078         },
1079         {
1080                 .ctl_name       = VM_MIN_UNMAPPED,
1081                 .procname       = "min_unmapped_ratio",
1082                 .data           = &sysctl_min_unmapped_ratio,
1083                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1084                 .mode           = 0644,
1085                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1086                 .strategy       = &sysctl_intvec,
1087                 .extra1         = &zero,
1088                 .extra2         = &one_hundred,
1089         },
1090         {
1091                 .ctl_name       = VM_MIN_SLAB,
1092                 .procname       = "min_slab_ratio",
1093                 .data           = &sysctl_min_slab_ratio,
1094                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1095                 .mode           = 0644,
1096                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1097                 .strategy       = &sysctl_intvec,
1098                 .extra1         = &zero,
1099                 .extra2         = &one_hundred,
1100         },
1101 #endif
1102 #ifdef CONFIG_SMP
1103         {
1104                 .ctl_name       = CTL_UNNUMBERED,
1105                 .procname       = "stat_interval",
1106                 .data           = &sysctl_stat_interval,
1107                 .maxlen         = sizeof(sysctl_stat_interval),
1108                 .mode           = 0644,
1109                 .proc_handler   = &proc_dointvec_jiffies,
1110                 .strategy       = &sysctl_jiffies,
1111         },
1112 #endif
1113 #ifdef CONFIG_SECURITY
1114         {
1115                 .ctl_name       = CTL_UNNUMBERED,
1116                 .procname       = "mmap_min_addr",
1117                 .data           = &mmap_min_addr,
1118                 .maxlen         = sizeof(unsigned long),
1119                 .mode           = 0644,
1120                 .proc_handler   = &proc_doulongvec_minmax,
1121         },
1122 #endif
1123 #ifdef CONFIG_NUMA
1124         {
1125                 .ctl_name       = CTL_UNNUMBERED,
1126                 .procname       = "numa_zonelist_order",
1127                 .data           = &numa_zonelist_order,
1128                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1129                 .mode           = 0644,
1130                 .proc_handler   = &numa_zonelist_order_handler,
1131                 .strategy       = &sysctl_string,
1132         },
1133 #endif
1134 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1135    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1136         {
1137                 .ctl_name       = VM_VDSO_ENABLED,
1138                 .procname       = "vdso_enabled",
1139                 .data           = &vdso_enabled,
1140                 .maxlen         = sizeof(vdso_enabled),
1141                 .mode           = 0644,
1142                 .proc_handler   = &proc_dointvec,
1143                 .strategy       = &sysctl_intvec,
1144                 .extra1         = &zero,
1145         },
1146 #endif
1147 #ifdef CONFIG_HIGHMEM
1148         {
1149                 .ctl_name       = CTL_UNNUMBERED,
1150                 .procname       = "highmem_is_dirtyable",
1151                 .data           = &vm_highmem_is_dirtyable,
1152                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1153                 .mode           = 0644,
1154                 .proc_handler   = &proc_dointvec_minmax,
1155                 .strategy       = &sysctl_intvec,
1156                 .extra1         = &zero,
1157                 .extra2         = &one,
1158         },
1159 #endif
1160 /*
1161  * NOTE: do not add new entries to this table unless you have read
1162  * Documentation/sysctl/ctl_unnumbered.txt
1163  */
1164         { .ctl_name = 0 }
1165 };
1166
1167 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1168 static struct ctl_table binfmt_misc_table[] = {
1169         { .ctl_name = 0 }
1170 };
1171 #endif
1172
1173 static struct ctl_table fs_table[] = {
1174         {
1175                 .ctl_name       = FS_NRINODE,
1176                 .procname       = "inode-nr",
1177                 .data           = &inodes_stat,
1178                 .maxlen         = 2*sizeof(int),
1179                 .mode           = 0444,
1180                 .proc_handler   = &proc_dointvec,
1181         },
1182         {
1183                 .ctl_name       = FS_STATINODE,
1184                 .procname       = "inode-state",
1185                 .data           = &inodes_stat,
1186                 .maxlen         = 7*sizeof(int),
1187                 .mode           = 0444,
1188                 .proc_handler   = &proc_dointvec,
1189         },
1190         {
1191                 .procname       = "file-nr",
1192                 .data           = &files_stat,
1193                 .maxlen         = 3*sizeof(int),
1194                 .mode           = 0444,
1195                 .proc_handler   = &proc_nr_files,
1196         },
1197         {
1198                 .ctl_name       = FS_MAXFILE,
1199                 .procname       = "file-max",
1200                 .data           = &files_stat.max_files,
1201                 .maxlen         = sizeof(int),
1202                 .mode           = 0644,
1203                 .proc_handler   = &proc_dointvec,
1204         },
1205         {
1206                 .ctl_name       = FS_DENTRY,
1207                 .procname       = "dentry-state",
1208                 .data           = &dentry_stat,
1209                 .maxlen         = 6*sizeof(int),
1210                 .mode           = 0444,
1211                 .proc_handler   = &proc_dointvec,
1212         },
1213         {
1214                 .ctl_name       = FS_OVERFLOWUID,
1215                 .procname       = "overflowuid",
1216                 .data           = &fs_overflowuid,
1217                 .maxlen         = sizeof(int),
1218                 .mode           = 0644,
1219                 .proc_handler   = &proc_dointvec_minmax,
1220                 .strategy       = &sysctl_intvec,
1221                 .extra1         = &minolduid,
1222                 .extra2         = &maxolduid,
1223         },
1224         {
1225                 .ctl_name       = FS_OVERFLOWGID,
1226                 .procname       = "overflowgid",
1227                 .data           = &fs_overflowgid,
1228                 .maxlen         = sizeof(int),
1229                 .mode           = 0644,
1230                 .proc_handler   = &proc_dointvec_minmax,
1231                 .strategy       = &sysctl_intvec,
1232                 .extra1         = &minolduid,
1233                 .extra2         = &maxolduid,
1234         },
1235         {
1236                 .ctl_name       = FS_LEASES,
1237                 .procname       = "leases-enable",
1238                 .data           = &leases_enable,
1239                 .maxlen         = sizeof(int),
1240                 .mode           = 0644,
1241                 .proc_handler   = &proc_dointvec,
1242         },
1243 #ifdef CONFIG_DNOTIFY
1244         {
1245                 .ctl_name       = FS_DIR_NOTIFY,
1246                 .procname       = "dir-notify-enable",
1247                 .data           = &dir_notify_enable,
1248                 .maxlen         = sizeof(int),
1249                 .mode           = 0644,
1250                 .proc_handler   = &proc_dointvec,
1251         },
1252 #endif
1253 #ifdef CONFIG_MMU
1254         {
1255                 .ctl_name       = FS_LEASE_TIME,
1256                 .procname       = "lease-break-time",
1257                 .data           = &lease_break_time,
1258                 .maxlen         = sizeof(int),
1259                 .mode           = 0644,
1260                 .proc_handler   = &proc_dointvec_minmax,
1261                 .strategy       = &sysctl_intvec,
1262                 .extra1         = &zero,
1263                 .extra2         = &two,
1264         },
1265         {
1266                 .procname       = "aio-nr",
1267                 .data           = &aio_nr,
1268                 .maxlen         = sizeof(aio_nr),
1269                 .mode           = 0444,
1270                 .proc_handler   = &proc_doulongvec_minmax,
1271         },
1272         {
1273                 .procname       = "aio-max-nr",
1274                 .data           = &aio_max_nr,
1275                 .maxlen         = sizeof(aio_max_nr),
1276                 .mode           = 0644,
1277                 .proc_handler   = &proc_doulongvec_minmax,
1278         },
1279 #ifdef CONFIG_INOTIFY_USER
1280         {
1281                 .ctl_name       = FS_INOTIFY,
1282                 .procname       = "inotify",
1283                 .mode           = 0555,
1284                 .child          = inotify_table,
1285         },
1286 #endif  
1287 #endif
1288         {
1289                 .ctl_name       = KERN_SETUID_DUMPABLE,
1290                 .procname       = "suid_dumpable",
1291                 .data           = &suid_dumpable,
1292                 .maxlen         = sizeof(int),
1293                 .mode           = 0644,
1294                 .proc_handler   = &proc_dointvec,
1295         },
1296 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1297         {
1298                 .ctl_name       = CTL_UNNUMBERED,
1299                 .procname       = "binfmt_misc",
1300                 .mode           = 0555,
1301                 .child          = binfmt_misc_table,
1302         },
1303 #endif
1304 /*
1305  * NOTE: do not add new entries to this table unless you have read
1306  * Documentation/sysctl/ctl_unnumbered.txt
1307  */
1308         { .ctl_name = 0 }
1309 };
1310
1311 static struct ctl_table debug_table[] = {
1312 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1313         {
1314                 .ctl_name       = CTL_UNNUMBERED,
1315                 .procname       = "exception-trace",
1316                 .data           = &show_unhandled_signals,
1317                 .maxlen         = sizeof(int),
1318                 .mode           = 0644,
1319                 .proc_handler   = proc_dointvec
1320         },
1321 #endif
1322         { .ctl_name = 0 }
1323 };
1324
1325 static struct ctl_table dev_table[] = {
1326         { .ctl_name = 0 }
1327 };
1328
1329 static DEFINE_SPINLOCK(sysctl_lock);
1330
1331 /* called under sysctl_lock */
1332 static int use_table(struct ctl_table_header *p)
1333 {
1334         if (unlikely(p->unregistering))
1335                 return 0;
1336         p->used++;
1337         return 1;
1338 }
1339
1340 /* called under sysctl_lock */
1341 static void unuse_table(struct ctl_table_header *p)
1342 {
1343         if (!--p->used)
1344                 if (unlikely(p->unregistering))
1345                         complete(p->unregistering);
1346 }
1347
1348 /* called under sysctl_lock, will reacquire if has to wait */
1349 static void start_unregistering(struct ctl_table_header *p)
1350 {
1351         /*
1352          * if p->used is 0, nobody will ever touch that entry again;
1353          * we'll eliminate all paths to it before dropping sysctl_lock
1354          */
1355         if (unlikely(p->used)) {
1356                 struct completion wait;
1357                 init_completion(&wait);
1358                 p->unregistering = &wait;
1359                 spin_unlock(&sysctl_lock);
1360                 wait_for_completion(&wait);
1361                 spin_lock(&sysctl_lock);
1362         }
1363         /*
1364          * do not remove from the list until nobody holds it; walking the
1365          * list in do_sysctl() relies on that.
1366          */
1367         list_del_init(&p->ctl_entry);
1368 }
1369
1370 void sysctl_head_finish(struct ctl_table_header *head)
1371 {
1372         if (!head)
1373                 return;
1374         spin_lock(&sysctl_lock);
1375         unuse_table(head);
1376         spin_unlock(&sysctl_lock);
1377 }
1378
1379 static struct list_head *
1380 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1381 {
1382         struct list_head *header_list;
1383         header_list = &root->header_list;
1384         if (root->lookup)
1385                 header_list = root->lookup(root, namespaces);
1386         return header_list;
1387 }
1388
1389 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1390                                             struct ctl_table_header *prev)
1391 {
1392         struct ctl_table_root *root;
1393         struct list_head *header_list;
1394         struct ctl_table_header *head;
1395         struct list_head *tmp;
1396
1397         spin_lock(&sysctl_lock);
1398         if (prev) {
1399                 head = prev;
1400                 tmp = &prev->ctl_entry;
1401                 unuse_table(prev);
1402                 goto next;
1403         }
1404         tmp = &root_table_header.ctl_entry;
1405         for (;;) {
1406                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1407
1408                 if (!use_table(head))
1409                         goto next;
1410                 spin_unlock(&sysctl_lock);
1411                 return head;
1412         next:
1413                 root = head->root;
1414                 tmp = tmp->next;
1415                 header_list = lookup_header_list(root, namespaces);
1416                 if (tmp != header_list)
1417                         continue;
1418
1419                 do {
1420                         root = list_entry(root->root_list.next,
1421                                         struct ctl_table_root, root_list);
1422                         if (root == &sysctl_table_root)
1423                                 goto out;
1424                         header_list = lookup_header_list(root, namespaces);
1425                 } while (list_empty(header_list));
1426                 tmp = header_list->next;
1427         }
1428 out:
1429         spin_unlock(&sysctl_lock);
1430         return NULL;
1431 }
1432
1433 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1434 {
1435         return __sysctl_head_next(current->nsproxy, prev);
1436 }
1437
1438 void register_sysctl_root(struct ctl_table_root *root)
1439 {
1440         spin_lock(&sysctl_lock);
1441         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1442         spin_unlock(&sysctl_lock);
1443 }
1444
1445 #ifdef CONFIG_SYSCTL_SYSCALL
1446 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1447                void __user *newval, size_t newlen)
1448 {
1449         struct ctl_table_header *head;
1450         int error = -ENOTDIR;
1451
1452         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1453                 return -ENOTDIR;
1454         if (oldval) {
1455                 int old_len;
1456                 if (!oldlenp || get_user(old_len, oldlenp))
1457                         return -EFAULT;
1458         }
1459
1460         for (head = sysctl_head_next(NULL); head;
1461                         head = sysctl_head_next(head)) {
1462                 error = parse_table(name, nlen, oldval, oldlenp, 
1463                                         newval, newlen, head->ctl_table);
1464                 if (error != -ENOTDIR) {
1465                         sysctl_head_finish(head);
1466                         break;
1467                 }
1468         }
1469         return error;
1470 }
1471
1472 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1473 {
1474         struct __sysctl_args tmp;
1475         int error;
1476
1477         if (copy_from_user(&tmp, args, sizeof(tmp)))
1478                 return -EFAULT;
1479
1480         error = deprecated_sysctl_warning(&tmp);
1481         if (error)
1482                 goto out;
1483
1484         lock_kernel();
1485         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1486                           tmp.newval, tmp.newlen);
1487         unlock_kernel();
1488 out:
1489         return error;
1490 }
1491 #endif /* CONFIG_SYSCTL_SYSCALL */
1492
1493 /*
1494  * sysctl_perm does NOT grant the superuser all rights automatically, because
1495  * some sysctl variables are readonly even to root.
1496  */
1497
1498 static int test_perm(int mode, int op)
1499 {
1500         if (!current->euid)
1501                 mode >>= 6;
1502         else if (in_egroup_p(0))
1503                 mode >>= 3;
1504         if ((mode & op & 0007) == op)
1505                 return 0;
1506         return -EACCES;
1507 }
1508
1509 int sysctl_perm(struct ctl_table *table, int op)
1510 {
1511         int error;
1512         error = security_sysctl(table, op);
1513         if (error)
1514                 return error;
1515         return test_perm(table->mode, op);
1516 }
1517
1518 #ifdef CONFIG_SYSCTL_SYSCALL
1519 static int parse_table(int __user *name, int nlen,
1520                        void __user *oldval, size_t __user *oldlenp,
1521                        void __user *newval, size_t newlen,
1522                        struct ctl_table *table)
1523 {
1524         int n;
1525 repeat:
1526         if (!nlen)
1527                 return -ENOTDIR;
1528         if (get_user(n, name))
1529                 return -EFAULT;
1530         for ( ; table->ctl_name || table->procname; table++) {
1531                 if (!table->ctl_name)
1532                         continue;
1533                 if (n == table->ctl_name) {
1534                         int error;
1535                         if (table->child) {
1536                                 if (sysctl_perm(table, 001))
1537                                         return -EPERM;
1538                                 name++;
1539                                 nlen--;
1540                                 table = table->child;
1541                                 goto repeat;
1542                         }
1543                         error = do_sysctl_strategy(table, name, nlen,
1544                                                    oldval, oldlenp,
1545                                                    newval, newlen);
1546                         return error;
1547                 }
1548         }
1549         return -ENOTDIR;
1550 }
1551
1552 /* Perform the actual read/write of a sysctl table entry. */
1553 int do_sysctl_strategy (struct ctl_table *table,
1554                         int __user *name, int nlen,
1555                         void __user *oldval, size_t __user *oldlenp,
1556                         void __user *newval, size_t newlen)
1557 {
1558         int op = 0, rc;
1559
1560         if (oldval)
1561                 op |= 004;
1562         if (newval) 
1563                 op |= 002;
1564         if (sysctl_perm(table, op))
1565                 return -EPERM;
1566
1567         if (table->strategy) {
1568                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1569                                      newval, newlen);
1570                 if (rc < 0)
1571                         return rc;
1572                 if (rc > 0)
1573                         return 0;
1574         }
1575
1576         /* If there is no strategy routine, or if the strategy returns
1577          * zero, proceed with automatic r/w */
1578         if (table->data && table->maxlen) {
1579                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1580                                  newval, newlen);
1581                 if (rc < 0)
1582                         return rc;
1583         }
1584         return 0;
1585 }
1586 #endif /* CONFIG_SYSCTL_SYSCALL */
1587
1588 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1589 {
1590         for (; table->ctl_name || table->procname; table++) {
1591                 table->parent = parent;
1592                 if (table->child)
1593                         sysctl_set_parent(table, table->child);
1594         }
1595 }
1596
1597 static __init int sysctl_init(void)
1598 {
1599         int err;
1600         sysctl_set_parent(NULL, root_table);
1601         err = sysctl_check_table(current->nsproxy, root_table);
1602         return 0;
1603 }
1604
1605 core_initcall(sysctl_init);
1606
1607 /**
1608  * __register_sysctl_paths - register a sysctl hierarchy
1609  * @root: List of sysctl headers to register on
1610  * @namespaces: Data to compute which lists of sysctl entries are visible
1611  * @path: The path to the directory the sysctl table is in.
1612  * @table: the top-level table structure
1613  *
1614  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1615  * array. A completely 0 filled entry terminates the table.
1616  *
1617  * The members of the &struct ctl_table structure are used as follows:
1618  *
1619  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1620  *            must be unique within that level of sysctl
1621  *
1622  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1623  *            enter a sysctl file
1624  *
1625  * data - a pointer to data for use by proc_handler
1626  *
1627  * maxlen - the maximum size in bytes of the data
1628  *
1629  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1630  *
1631  * child - a pointer to the child sysctl table if this entry is a directory, or
1632  *         %NULL.
1633  *
1634  * proc_handler - the text handler routine (described below)
1635  *
1636  * strategy - the strategy routine (described below)
1637  *
1638  * de - for internal use by the sysctl routines
1639  *
1640  * extra1, extra2 - extra pointers usable by the proc handler routines
1641  *
1642  * Leaf nodes in the sysctl tree will be represented by a single file
1643  * under /proc; non-leaf nodes will be represented by directories.
1644  *
1645  * sysctl(2) can automatically manage read and write requests through
1646  * the sysctl table.  The data and maxlen fields of the ctl_table
1647  * struct enable minimal validation of the values being written to be
1648  * performed, and the mode field allows minimal authentication.
1649  *
1650  * More sophisticated management can be enabled by the provision of a
1651  * strategy routine with the table entry.  This will be called before
1652  * any automatic read or write of the data is performed.
1653  *
1654  * The strategy routine may return
1655  *
1656  * < 0 - Error occurred (error is passed to user process)
1657  *
1658  * 0   - OK - proceed with automatic read or write.
1659  *
1660  * > 0 - OK - read or write has been done by the strategy routine, so
1661  *       return immediately.
1662  *
1663  * There must be a proc_handler routine for any terminal nodes
1664  * mirrored under /proc/sys (non-terminals are handled by a built-in
1665  * directory handler).  Several default handlers are available to
1666  * cover common cases -
1667  *
1668  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1669  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1670  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1671  *
1672  * It is the handler's job to read the input buffer from user memory
1673  * and process it. The handler should return 0 on success.
1674  *
1675  * This routine returns %NULL on a failure to register, and a pointer
1676  * to the table header on success.
1677  */
1678 struct ctl_table_header *__register_sysctl_paths(
1679         struct ctl_table_root *root,
1680         struct nsproxy *namespaces,
1681         const struct ctl_path *path, struct ctl_table *table)
1682 {
1683         struct list_head *header_list;
1684         struct ctl_table_header *header;
1685         struct ctl_table *new, **prevp;
1686         unsigned int n, npath;
1687
1688         /* Count the path components */
1689         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1690                 ;
1691
1692         /*
1693          * For each path component, allocate a 2-element ctl_table array.
1694          * The first array element will be filled with the sysctl entry
1695          * for this, the second will be the sentinel (ctl_name == 0).
1696          *
1697          * We allocate everything in one go so that we don't have to
1698          * worry about freeing additional memory in unregister_sysctl_table.
1699          */
1700         header = kzalloc(sizeof(struct ctl_table_header) +
1701                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1702         if (!header)
1703                 return NULL;
1704
1705         new = (struct ctl_table *) (header + 1);
1706
1707         /* Now connect the dots */
1708         prevp = &header->ctl_table;
1709         for (n = 0; n < npath; ++n, ++path) {
1710                 /* Copy the procname */
1711                 new->procname = path->procname;
1712                 new->ctl_name = path->ctl_name;
1713                 new->mode     = 0555;
1714
1715                 *prevp = new;
1716                 prevp = &new->child;
1717
1718                 new += 2;
1719         }
1720         *prevp = table;
1721         header->ctl_table_arg = table;
1722
1723         INIT_LIST_HEAD(&header->ctl_entry);
1724         header->used = 0;
1725         header->unregistering = NULL;
1726         header->root = root;
1727         sysctl_set_parent(NULL, header->ctl_table);
1728         if (sysctl_check_table(namespaces, header->ctl_table)) {
1729                 kfree(header);
1730                 return NULL;
1731         }
1732         spin_lock(&sysctl_lock);
1733         header_list = lookup_header_list(root, namespaces);
1734         list_add_tail(&header->ctl_entry, header_list);
1735         spin_unlock(&sysctl_lock);
1736
1737         return header;
1738 }
1739
1740 /**
1741  * register_sysctl_table_path - register a sysctl table hierarchy
1742  * @path: The path to the directory the sysctl table is in.
1743  * @table: the top-level table structure
1744  *
1745  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1746  * array. A completely 0 filled entry terminates the table.
1747  *
1748  * See __register_sysctl_paths for more details.
1749  */
1750 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1751                                                 struct ctl_table *table)
1752 {
1753         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1754                                         path, table);
1755 }
1756
1757 /**
1758  * register_sysctl_table - register a sysctl table hierarchy
1759  * @table: the top-level table structure
1760  *
1761  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1762  * array. A completely 0 filled entry terminates the table.
1763  *
1764  * See register_sysctl_paths for more details.
1765  */
1766 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1767 {
1768         static const struct ctl_path null_path[] = { {} };
1769
1770         return register_sysctl_paths(null_path, table);
1771 }
1772
1773 /**
1774  * unregister_sysctl_table - unregister a sysctl table hierarchy
1775  * @header: the header returned from register_sysctl_table
1776  *
1777  * Unregisters the sysctl table and all children. proc entries may not
1778  * actually be removed until they are no longer used by anyone.
1779  */
1780 void unregister_sysctl_table(struct ctl_table_header * header)
1781 {
1782         might_sleep();
1783
1784         if (header == NULL)
1785                 return;
1786
1787         spin_lock(&sysctl_lock);
1788         start_unregistering(header);
1789         spin_unlock(&sysctl_lock);
1790         kfree(header);
1791 }
1792
1793 #else /* !CONFIG_SYSCTL */
1794 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1795 {
1796         return NULL;
1797 }
1798
1799 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1800                                                     struct ctl_table *table)
1801 {
1802         return NULL;
1803 }
1804
1805 void unregister_sysctl_table(struct ctl_table_header * table)
1806 {
1807 }
1808
1809 #endif /* CONFIG_SYSCTL */
1810
1811 /*
1812  * /proc/sys support
1813  */
1814
1815 #ifdef CONFIG_PROC_SYSCTL
1816
1817 static int _proc_do_string(void* data, int maxlen, int write,
1818                            struct file *filp, void __user *buffer,
1819                            size_t *lenp, loff_t *ppos)
1820 {
1821         size_t len;
1822         char __user *p;
1823         char c;
1824
1825         if (!data || !maxlen || !*lenp) {
1826                 *lenp = 0;
1827                 return 0;
1828         }
1829
1830         if (write) {
1831                 len = 0;
1832                 p = buffer;
1833                 while (len < *lenp) {
1834                         if (get_user(c, p++))
1835                                 return -EFAULT;
1836                         if (c == 0 || c == '\n')
1837                                 break;
1838                         len++;
1839                 }
1840                 if (len >= maxlen)
1841                         len = maxlen-1;
1842                 if(copy_from_user(data, buffer, len))
1843                         return -EFAULT;
1844                 ((char *) data)[len] = 0;
1845                 *ppos += *lenp;
1846         } else {
1847                 len = strlen(data);
1848                 if (len > maxlen)
1849                         len = maxlen;
1850
1851                 if (*ppos > len) {
1852                         *lenp = 0;
1853                         return 0;
1854                 }
1855
1856                 data += *ppos;
1857                 len  -= *ppos;
1858
1859                 if (len > *lenp)
1860                         len = *lenp;
1861                 if (len)
1862                         if(copy_to_user(buffer, data, len))
1863                                 return -EFAULT;
1864                 if (len < *lenp) {
1865                         if(put_user('\n', ((char __user *) buffer) + len))
1866                                 return -EFAULT;
1867                         len++;
1868                 }
1869                 *lenp = len;
1870                 *ppos += len;
1871         }
1872         return 0;
1873 }
1874
1875 /**
1876  * proc_dostring - read a string sysctl
1877  * @table: the sysctl table
1878  * @write: %TRUE if this is a write to the sysctl file
1879  * @filp: the file structure
1880  * @buffer: the user buffer
1881  * @lenp: the size of the user buffer
1882  * @ppos: file position
1883  *
1884  * Reads/writes a string from/to the user buffer. If the kernel
1885  * buffer provided is not large enough to hold the string, the
1886  * string is truncated. The copied string is %NULL-terminated.
1887  * If the string is being read by the user process, it is copied
1888  * and a newline '\n' is added. It is truncated if the buffer is
1889  * not large enough.
1890  *
1891  * Returns 0 on success.
1892  */
1893 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1894                   void __user *buffer, size_t *lenp, loff_t *ppos)
1895 {
1896         return _proc_do_string(table->data, table->maxlen, write, filp,
1897                                buffer, lenp, ppos);
1898 }
1899
1900
1901 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1902                                  int *valp,
1903                                  int write, void *data)
1904 {
1905         if (write) {
1906                 *valp = *negp ? -*lvalp : *lvalp;
1907         } else {
1908                 int val = *valp;
1909                 if (val < 0) {
1910                         *negp = -1;
1911                         *lvalp = (unsigned long)-val;
1912                 } else {
1913                         *negp = 0;
1914                         *lvalp = (unsigned long)val;
1915                 }
1916         }
1917         return 0;
1918 }
1919
1920 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1921                   int write, struct file *filp, void __user *buffer,
1922                   size_t *lenp, loff_t *ppos,
1923                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1924                               int write, void *data),
1925                   void *data)
1926 {
1927 #define TMPBUFLEN 21
1928         int *i, vleft, first=1, neg, val;
1929         unsigned long lval;
1930         size_t left, len;
1931         
1932         char buf[TMPBUFLEN], *p;
1933         char __user *s = buffer;
1934         
1935         if (!tbl_data || !table->maxlen || !*lenp ||
1936             (*ppos && !write)) {
1937                 *lenp = 0;
1938                 return 0;
1939         }
1940         
1941         i = (int *) tbl_data;
1942         vleft = table->maxlen / sizeof(*i);
1943         left = *lenp;
1944
1945         if (!conv)
1946                 conv = do_proc_dointvec_conv;
1947
1948         for (; left && vleft--; i++, first=0) {
1949                 if (write) {
1950                         while (left) {
1951                                 char c;
1952                                 if (get_user(c, s))
1953                                         return -EFAULT;
1954                                 if (!isspace(c))
1955                                         break;
1956                                 left--;
1957                                 s++;
1958                         }
1959                         if (!left)
1960                                 break;
1961                         neg = 0;
1962                         len = left;
1963                         if (len > sizeof(buf) - 1)
1964                                 len = sizeof(buf) - 1;
1965                         if (copy_from_user(buf, s, len))
1966                                 return -EFAULT;
1967                         buf[len] = 0;
1968                         p = buf;
1969                         if (*p == '-' && left > 1) {
1970                                 neg = 1;
1971                                 p++;
1972                         }
1973                         if (*p < '0' || *p > '9')
1974                                 break;
1975
1976                         lval = simple_strtoul(p, &p, 0);
1977
1978                         len = p-buf;
1979                         if ((len < left) && *p && !isspace(*p))
1980                                 break;
1981                         if (neg)
1982                                 val = -val;
1983                         s += len;
1984                         left -= len;
1985
1986                         if (conv(&neg, &lval, i, 1, data))
1987                                 break;
1988                 } else {
1989                         p = buf;
1990                         if (!first)
1991                                 *p++ = '\t';
1992         
1993                         if (conv(&neg, &lval, i, 0, data))
1994                                 break;
1995
1996                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1997                         len = strlen(buf);
1998                         if (len > left)
1999                                 len = left;
2000                         if(copy_to_user(s, buf, len))
2001                                 return -EFAULT;
2002                         left -= len;
2003                         s += len;
2004                 }
2005         }
2006
2007         if (!write && !first && left) {
2008                 if(put_user('\n', s))
2009                         return -EFAULT;
2010                 left--, s++;
2011         }
2012         if (write) {
2013                 while (left) {
2014                         char c;
2015                         if (get_user(c, s++))
2016                                 return -EFAULT;
2017                         if (!isspace(c))
2018                                 break;
2019                         left--;
2020                 }
2021         }
2022         if (write && first)
2023                 return -EINVAL;
2024         *lenp -= left;
2025         *ppos += *lenp;
2026         return 0;
2027 #undef TMPBUFLEN
2028 }
2029
2030 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2031                   void __user *buffer, size_t *lenp, loff_t *ppos,
2032                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2033                               int write, void *data),
2034                   void *data)
2035 {
2036         return __do_proc_dointvec(table->data, table, write, filp,
2037                         buffer, lenp, ppos, conv, data);
2038 }
2039
2040 /**
2041  * proc_dointvec - read a vector of integers
2042  * @table: the sysctl table
2043  * @write: %TRUE if this is a write to the sysctl file
2044  * @filp: the file structure
2045  * @buffer: the user buffer
2046  * @lenp: the size of the user buffer
2047  * @ppos: file position
2048  *
2049  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2050  * values from/to the user buffer, treated as an ASCII string. 
2051  *
2052  * Returns 0 on success.
2053  */
2054 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2055                      void __user *buffer, size_t *lenp, loff_t *ppos)
2056 {
2057     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2058                             NULL,NULL);
2059 }
2060
2061 #define OP_SET  0
2062 #define OP_AND  1
2063 #define OP_OR   2
2064
2065 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2066                                       int *valp,
2067                                       int write, void *data)
2068 {
2069         int op = *(int *)data;
2070         if (write) {
2071                 int val = *negp ? -*lvalp : *lvalp;
2072                 switch(op) {
2073                 case OP_SET:    *valp = val; break;
2074                 case OP_AND:    *valp &= val; break;
2075                 case OP_OR:     *valp |= val; break;
2076                 }
2077         } else {
2078                 int val = *valp;
2079                 if (val < 0) {
2080                         *negp = -1;
2081                         *lvalp = (unsigned long)-val;
2082                 } else {
2083                         *negp = 0;
2084                         *lvalp = (unsigned long)val;
2085                 }
2086         }
2087         return 0;
2088 }
2089
2090 /*
2091  *      Taint values can only be increased
2092  */
2093 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2094                                void __user *buffer, size_t *lenp, loff_t *ppos)
2095 {
2096         int op;
2097
2098         if (write && !capable(CAP_SYS_ADMIN))
2099                 return -EPERM;
2100
2101         op = OP_OR;
2102         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2103                                 do_proc_dointvec_bset_conv,&op);
2104 }
2105
2106 struct do_proc_dointvec_minmax_conv_param {
2107         int *min;
2108         int *max;
2109 };
2110
2111 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2112                                         int *valp, 
2113                                         int write, void *data)
2114 {
2115         struct do_proc_dointvec_minmax_conv_param *param = data;
2116         if (write) {
2117                 int val = *negp ? -*lvalp : *lvalp;
2118                 if ((param->min && *param->min > val) ||
2119                     (param->max && *param->max < val))
2120                         return -EINVAL;
2121                 *valp = val;
2122         } else {
2123                 int val = *valp;
2124                 if (val < 0) {
2125                         *negp = -1;
2126                         *lvalp = (unsigned long)-val;
2127                 } else {
2128                         *negp = 0;
2129                         *lvalp = (unsigned long)val;
2130                 }
2131         }
2132         return 0;
2133 }
2134
2135 /**
2136  * proc_dointvec_minmax - read a vector of integers with min/max values
2137  * @table: the sysctl table
2138  * @write: %TRUE if this is a write to the sysctl file
2139  * @filp: the file structure
2140  * @buffer: the user buffer
2141  * @lenp: the size of the user buffer
2142  * @ppos: file position
2143  *
2144  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2145  * values from/to the user buffer, treated as an ASCII string.
2146  *
2147  * This routine will ensure the values are within the range specified by
2148  * table->extra1 (min) and table->extra2 (max).
2149  *
2150  * Returns 0 on success.
2151  */
2152 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2153                   void __user *buffer, size_t *lenp, loff_t *ppos)
2154 {
2155         struct do_proc_dointvec_minmax_conv_param param = {
2156                 .min = (int *) table->extra1,
2157                 .max = (int *) table->extra2,
2158         };
2159         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2160                                 do_proc_dointvec_minmax_conv, &param);
2161 }
2162
2163 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2164                                      struct file *filp,
2165                                      void __user *buffer,
2166                                      size_t *lenp, loff_t *ppos,
2167                                      unsigned long convmul,
2168                                      unsigned long convdiv)
2169 {
2170 #define TMPBUFLEN 21
2171         unsigned long *i, *min, *max, val;
2172         int vleft, first=1, neg;
2173         size_t len, left;
2174         char buf[TMPBUFLEN], *p;
2175         char __user *s = buffer;
2176         
2177         if (!data || !table->maxlen || !*lenp ||
2178             (*ppos && !write)) {
2179                 *lenp = 0;
2180                 return 0;
2181         }
2182         
2183         i = (unsigned long *) data;
2184         min = (unsigned long *) table->extra1;
2185         max = (unsigned long *) table->extra2;
2186         vleft = table->maxlen / sizeof(unsigned long);
2187         left = *lenp;
2188         
2189         for (; left && vleft--; i++, min++, max++, first=0) {
2190                 if (write) {
2191                         while (left) {
2192                                 char c;
2193                                 if (get_user(c, s))
2194                                         return -EFAULT;
2195                                 if (!isspace(c))
2196                                         break;
2197                                 left--;
2198                                 s++;
2199                         }
2200                         if (!left)
2201                                 break;
2202                         neg = 0;
2203                         len = left;
2204                         if (len > TMPBUFLEN-1)
2205                                 len = TMPBUFLEN-1;
2206                         if (copy_from_user(buf, s, len))
2207                                 return -EFAULT;
2208                         buf[len] = 0;
2209                         p = buf;
2210                         if (*p == '-' && left > 1) {
2211                                 neg = 1;
2212                                 p++;
2213                         }
2214                         if (*p < '0' || *p > '9')
2215                                 break;
2216                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2217                         len = p-buf;
2218                         if ((len < left) && *p && !isspace(*p))
2219                                 break;
2220                         if (neg)
2221                                 val = -val;
2222                         s += len;
2223                         left -= len;
2224
2225                         if(neg)
2226                                 continue;
2227                         if ((min && val < *min) || (max && val > *max))
2228                                 continue;
2229                         *i = val;
2230                 } else {
2231                         p = buf;
2232                         if (!first)
2233                                 *p++ = '\t';
2234                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2235                         len = strlen(buf);
2236                         if (len > left)
2237                                 len = left;
2238                         if(copy_to_user(s, buf, len))
2239                                 return -EFAULT;
2240                         left -= len;
2241                         s += len;
2242                 }
2243         }
2244
2245         if (!write && !first && left) {
2246                 if(put_user('\n', s))
2247                         return -EFAULT;
2248                 left--, s++;
2249         }
2250         if (write) {
2251                 while (left) {
2252                         char c;
2253                         if (get_user(c, s++))
2254                                 return -EFAULT;
2255                         if (!isspace(c))
2256                                 break;
2257                         left--;
2258                 }
2259         }
2260         if (write && first)
2261                 return -EINVAL;
2262         *lenp -= left;
2263         *ppos += *lenp;
2264         return 0;
2265 #undef TMPBUFLEN
2266 }
2267
2268 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2269                                      struct file *filp,
2270                                      void __user *buffer,
2271                                      size_t *lenp, loff_t *ppos,
2272                                      unsigned long convmul,
2273                                      unsigned long convdiv)
2274 {
2275         return __do_proc_doulongvec_minmax(table->data, table, write,
2276                         filp, buffer, lenp, ppos, convmul, convdiv);
2277 }
2278
2279 /**
2280  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2281  * @table: the sysctl table
2282  * @write: %TRUE if this is a write to the sysctl file
2283  * @filp: the file structure
2284  * @buffer: the user buffer
2285  * @lenp: the size of the user buffer
2286  * @ppos: file position
2287  *
2288  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2289  * values from/to the user buffer, treated as an ASCII string.
2290  *
2291  * This routine will ensure the values are within the range specified by
2292  * table->extra1 (min) and table->extra2 (max).
2293  *
2294  * Returns 0 on success.
2295  */
2296 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2297                            void __user *buffer, size_t *lenp, loff_t *ppos)
2298 {
2299     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2300 }
2301
2302 /**
2303  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2304  * @table: the sysctl table
2305  * @write: %TRUE if this is a write to the sysctl file
2306  * @filp: the file structure
2307  * @buffer: the user buffer
2308  * @lenp: the size of the user buffer
2309  * @ppos: file position
2310  *
2311  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2312  * values from/to the user buffer, treated as an ASCII string. The values
2313  * are treated as milliseconds, and converted to jiffies when they are stored.
2314  *
2315  * This routine will ensure the values are within the range specified by
2316  * table->extra1 (min) and table->extra2 (max).
2317  *
2318  * Returns 0 on success.
2319  */
2320 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2321                                       struct file *filp,
2322                                       void __user *buffer,
2323                                       size_t *lenp, loff_t *ppos)
2324 {
2325     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2326                                      lenp, ppos, HZ, 1000l);
2327 }
2328
2329
2330 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2331                                          int *valp,
2332                                          int write, void *data)
2333 {
2334         if (write) {
2335                 if (*lvalp > LONG_MAX / HZ)
2336                         return 1;
2337                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2338         } else {
2339                 int val = *valp;
2340                 unsigned long lval;
2341                 if (val < 0) {
2342                         *negp = -1;
2343                         lval = (unsigned long)-val;
2344                 } else {
2345                         *negp = 0;
2346                         lval = (unsigned long)val;
2347                 }
2348                 *lvalp = lval / HZ;
2349         }
2350         return 0;
2351 }
2352
2353 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2354                                                 int *valp,
2355                                                 int write, void *data)
2356 {
2357         if (write) {
2358                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2359                         return 1;
2360                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2361         } else {
2362                 int val = *valp;
2363                 unsigned long lval;
2364                 if (val < 0) {
2365                         *negp = -1;
2366                         lval = (unsigned long)-val;
2367                 } else {
2368                         *negp = 0;
2369                         lval = (unsigned long)val;
2370                 }
2371                 *lvalp = jiffies_to_clock_t(lval);
2372         }
2373         return 0;
2374 }
2375
2376 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2377                                             int *valp,
2378                                             int write, void *data)
2379 {
2380         if (write) {
2381                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2382         } else {
2383                 int val = *valp;
2384                 unsigned long lval;
2385                 if (val < 0) {
2386                         *negp = -1;
2387                         lval = (unsigned long)-val;
2388                 } else {
2389                         *negp = 0;
2390                         lval = (unsigned long)val;
2391                 }
2392                 *lvalp = jiffies_to_msecs(lval);
2393         }
2394         return 0;
2395 }
2396
2397 /**
2398  * proc_dointvec_jiffies - read a vector of integers as seconds
2399  * @table: the sysctl table
2400  * @write: %TRUE if this is a write to the sysctl file
2401  * @filp: the file structure
2402  * @buffer: the user buffer
2403  * @lenp: the size of the user buffer
2404  * @ppos: file position
2405  *
2406  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2407  * values from/to the user buffer, treated as an ASCII string. 
2408  * The values read are assumed to be in seconds, and are converted into
2409  * jiffies.
2410  *
2411  * Returns 0 on success.
2412  */
2413 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2414                           void __user *buffer, size_t *lenp, loff_t *ppos)
2415 {
2416     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2417                             do_proc_dointvec_jiffies_conv,NULL);
2418 }
2419
2420 /**
2421  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2422  * @table: the sysctl table
2423  * @write: %TRUE if this is a write to the sysctl file
2424  * @filp: the file structure
2425  * @buffer: the user buffer
2426  * @lenp: the size of the user buffer
2427  * @ppos: pointer to the file position
2428  *
2429  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2430  * values from/to the user buffer, treated as an ASCII string. 
2431  * The values read are assumed to be in 1/USER_HZ seconds, and 
2432  * are converted into jiffies.
2433  *
2434  * Returns 0 on success.
2435  */
2436 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2437                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2438 {
2439     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2440                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2441 }
2442
2443 /**
2444  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2445  * @table: the sysctl table
2446  * @write: %TRUE if this is a write to the sysctl file
2447  * @filp: the file structure
2448  * @buffer: the user buffer
2449  * @lenp: the size of the user buffer
2450  * @ppos: file position
2451  * @ppos: the current position in the file
2452  *
2453  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2454  * values from/to the user buffer, treated as an ASCII string. 
2455  * The values read are assumed to be in 1/1000 seconds, and 
2456  * are converted into jiffies.
2457  *
2458  * Returns 0 on success.
2459  */
2460 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2461                              void __user *buffer, size_t *lenp, loff_t *ppos)
2462 {
2463         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2464                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2465 }
2466
2467 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2468                            void __user *buffer, size_t *lenp, loff_t *ppos)
2469 {
2470         struct pid *new_pid;
2471         pid_t tmp;
2472         int r;
2473
2474         tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
2475
2476         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2477                                lenp, ppos, NULL, NULL);
2478         if (r || !write)
2479                 return r;
2480
2481         new_pid = find_get_pid(tmp);
2482         if (!new_pid)
2483                 return -ESRCH;
2484
2485         put_pid(xchg(&cad_pid, new_pid));
2486         return 0;
2487 }
2488
2489 #else /* CONFIG_PROC_FS */
2490
2491 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2492                   void __user *buffer, size_t *lenp, loff_t *ppos)
2493 {
2494         return -ENOSYS;
2495 }
2496
2497 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2498                   void __user *buffer, size_t *lenp, loff_t *ppos)
2499 {
2500         return -ENOSYS;
2501 }
2502
2503 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2504                     void __user *buffer, size_t *lenp, loff_t *ppos)
2505 {
2506         return -ENOSYS;
2507 }
2508
2509 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2510                     void __user *buffer, size_t *lenp, loff_t *ppos)
2511 {
2512         return -ENOSYS;
2513 }
2514
2515 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2516                     void __user *buffer, size_t *lenp, loff_t *ppos)
2517 {
2518         return -ENOSYS;
2519 }
2520
2521 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2522                              void __user *buffer, size_t *lenp, loff_t *ppos)
2523 {
2524         return -ENOSYS;
2525 }
2526
2527 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2528                     void __user *buffer, size_t *lenp, loff_t *ppos)
2529 {
2530         return -ENOSYS;
2531 }
2532
2533 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2534                                       struct file *filp,
2535                                       void __user *buffer,
2536                                       size_t *lenp, loff_t *ppos)
2537 {
2538     return -ENOSYS;
2539 }
2540
2541
2542 #endif /* CONFIG_PROC_FS */
2543
2544
2545 #ifdef CONFIG_SYSCTL_SYSCALL
2546 /*
2547  * General sysctl support routines 
2548  */
2549
2550 /* The generic sysctl data routine (used if no strategy routine supplied) */
2551 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2552                 void __user *oldval, size_t __user *oldlenp,
2553                 void __user *newval, size_t newlen)
2554 {
2555         size_t len;
2556
2557         /* Get out of I don't have a variable */
2558         if (!table->data || !table->maxlen)
2559                 return -ENOTDIR;
2560
2561         if (oldval && oldlenp) {
2562                 if (get_user(len, oldlenp))
2563                         return -EFAULT;
2564                 if (len) {
2565                         if (len > table->maxlen)
2566                                 len = table->maxlen;
2567                         if (copy_to_user(oldval, table->data, len))
2568                                 return -EFAULT;
2569                         if (put_user(len, oldlenp))
2570                                 return -EFAULT;
2571                 }
2572         }
2573
2574         if (newval && newlen) {
2575                 if (newlen > table->maxlen)
2576                         newlen = table->maxlen;
2577
2578                 if (copy_from_user(table->data, newval, newlen))
2579                         return -EFAULT;
2580         }
2581         return 1;
2582 }
2583
2584 /* The generic string strategy routine: */
2585 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2586                   void __user *oldval, size_t __user *oldlenp,
2587                   void __user *newval, size_t newlen)
2588 {
2589         if (!table->data || !table->maxlen) 
2590                 return -ENOTDIR;
2591         
2592         if (oldval && oldlenp) {
2593                 size_t bufsize;
2594                 if (get_user(bufsize, oldlenp))
2595                         return -EFAULT;
2596                 if (bufsize) {
2597                         size_t len = strlen(table->data), copied;
2598
2599                         /* This shouldn't trigger for a well-formed sysctl */
2600                         if (len > table->maxlen)
2601                                 len = table->maxlen;
2602
2603                         /* Copy up to a max of bufsize-1 bytes of the string */
2604                         copied = (len >= bufsize) ? bufsize - 1 : len;
2605
2606                         if (copy_to_user(oldval, table->data, copied) ||
2607                             put_user(0, (char __user *)(oldval + copied)))
2608                                 return -EFAULT;
2609                         if (put_user(len, oldlenp))
2610                                 return -EFAULT;
2611                 }
2612         }
2613         if (newval && newlen) {
2614                 size_t len = newlen;
2615                 if (len > table->maxlen)
2616                         len = table->maxlen;
2617                 if(copy_from_user(table->data, newval, len))
2618                         return -EFAULT;
2619                 if (len == table->maxlen)
2620                         len--;
2621                 ((char *) table->data)[len] = 0;
2622         }
2623         return 1;
2624 }
2625
2626 /*
2627  * This function makes sure that all of the integers in the vector
2628  * are between the minimum and maximum values given in the arrays
2629  * table->extra1 and table->extra2, respectively.
2630  */
2631 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2632                 void __user *oldval, size_t __user *oldlenp,
2633                 void __user *newval, size_t newlen)
2634 {
2635
2636         if (newval && newlen) {
2637                 int __user *vec = (int __user *) newval;
2638                 int *min = (int *) table->extra1;
2639                 int *max = (int *) table->extra2;
2640                 size_t length;
2641                 int i;
2642
2643                 if (newlen % sizeof(int) != 0)
2644                         return -EINVAL;
2645
2646                 if (!table->extra1 && !table->extra2)
2647                         return 0;
2648
2649                 if (newlen > table->maxlen)
2650                         newlen = table->maxlen;
2651                 length = newlen / sizeof(int);
2652
2653                 for (i = 0; i < length; i++) {
2654                         int value;
2655                         if (get_user(value, vec + i))
2656                                 return -EFAULT;
2657                         if (min && value < min[i])
2658                                 return -EINVAL;
2659                         if (max && value > max[i])
2660                                 return -EINVAL;
2661                 }
2662         }
2663         return 0;
2664 }
2665
2666 /* Strategy function to convert jiffies to seconds */ 
2667 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2668                 void __user *oldval, size_t __user *oldlenp,
2669                 void __user *newval, size_t newlen)
2670 {
2671         if (oldval && oldlenp) {
2672                 size_t olen;
2673
2674                 if (get_user(olen, oldlenp))
2675                         return -EFAULT;
2676                 if (olen) {
2677                         int val;
2678
2679                         if (olen < sizeof(int))
2680                                 return -EINVAL;
2681
2682                         val = *(int *)(table->data) / HZ;
2683                         if (put_user(val, (int __user *)oldval))
2684                                 return -EFAULT;
2685                         if (put_user(sizeof(int), oldlenp))
2686                                 return -EFAULT;
2687                 }
2688         }
2689         if (newval && newlen) { 
2690                 int new;
2691                 if (newlen != sizeof(int))
2692                         return -EINVAL; 
2693                 if (get_user(new, (int __user *)newval))
2694                         return -EFAULT;
2695                 *(int *)(table->data) = new*HZ; 
2696         }
2697         return 1;
2698 }
2699
2700 /* Strategy function to convert jiffies to seconds */ 
2701 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2702                 void __user *oldval, size_t __user *oldlenp,
2703                 void __user *newval, size_t newlen)
2704 {
2705         if (oldval && oldlenp) {
2706                 size_t olen;
2707
2708                 if (get_user(olen, oldlenp))
2709                         return -EFAULT;
2710                 if (olen) {
2711                         int val;
2712
2713                         if (olen < sizeof(int))
2714                                 return -EINVAL;
2715
2716                         val = jiffies_to_msecs(*(int *)(table->data));
2717                         if (put_user(val, (int __user *)oldval))
2718                                 return -EFAULT;
2719                         if (put_user(sizeof(int), oldlenp))
2720                                 return -EFAULT;
2721                 }
2722         }
2723         if (newval && newlen) { 
2724                 int new;
2725                 if (newlen != sizeof(int))
2726                         return -EINVAL; 
2727                 if (get_user(new, (int __user *)newval))
2728                         return -EFAULT;
2729                 *(int *)(table->data) = msecs_to_jiffies(new);
2730         }
2731         return 1;
2732 }
2733
2734
2735
2736 #else /* CONFIG_SYSCTL_SYSCALL */
2737
2738
2739 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2740 {
2741         struct __sysctl_args tmp;
2742         int error;
2743
2744         if (copy_from_user(&tmp, args, sizeof(tmp)))
2745                 return -EFAULT;
2746
2747         error = deprecated_sysctl_warning(&tmp);
2748
2749         /* If no error reading the parameters then just -ENOSYS ... */
2750         if (!error)
2751                 error = -ENOSYS;
2752
2753         return error;
2754 }
2755
2756 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2757                   void __user *oldval, size_t __user *oldlenp,
2758                   void __user *newval, size_t newlen)
2759 {
2760         return -ENOSYS;
2761 }
2762
2763 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2764                   void __user *oldval, size_t __user *oldlenp,
2765                   void __user *newval, size_t newlen)
2766 {
2767         return -ENOSYS;
2768 }
2769
2770 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2771                 void __user *oldval, size_t __user *oldlenp,
2772                 void __user *newval, size_t newlen)
2773 {
2774         return -ENOSYS;
2775 }
2776
2777 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2778                 void __user *oldval, size_t __user *oldlenp,
2779                 void __user *newval, size_t newlen)
2780 {
2781         return -ENOSYS;
2782 }
2783
2784 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2785                 void __user *oldval, size_t __user *oldlenp,
2786                 void __user *newval, size_t newlen)
2787 {
2788         return -ENOSYS;
2789 }
2790
2791 #endif /* CONFIG_SYSCTL_SYSCALL */
2792
2793 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2794 {
2795         static int msg_count;
2796         int name[CTL_MAXNAME];
2797         int i;
2798
2799         /* Check args->nlen. */
2800         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2801                 return -ENOTDIR;
2802
2803         /* Read in the sysctl name for better debug message logging */
2804         for (i = 0; i < args->nlen; i++)
2805                 if (get_user(name[i], args->name + i))
2806                         return -EFAULT;
2807
2808         /* Ignore accesses to kernel.version */
2809         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2810                 return 0;
2811
2812         if (msg_count < 5) {
2813                 msg_count++;
2814                 printk(KERN_INFO
2815                         "warning: process `%s' used the deprecated sysctl "
2816                         "system call with ", current->comm);
2817                 for (i = 0; i < args->nlen; i++)
2818                         printk("%d.", name[i]);
2819                 printk("\n");
2820         }
2821         return 0;
2822 }
2823
2824 /*
2825  * No sense putting this after each symbol definition, twice,
2826  * exception granted :-)
2827  */
2828 EXPORT_SYMBOL(proc_dointvec);
2829 EXPORT_SYMBOL(proc_dointvec_jiffies);
2830 EXPORT_SYMBOL(proc_dointvec_minmax);
2831 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2832 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2833 EXPORT_SYMBOL(proc_dostring);
2834 EXPORT_SYMBOL(proc_doulongvec_minmax);
2835 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2836 EXPORT_SYMBOL(register_sysctl_table);
2837 EXPORT_SYMBOL(register_sysctl_paths);
2838 EXPORT_SYMBOL(sysctl_intvec);
2839 EXPORT_SYMBOL(sysctl_jiffies);
2840 EXPORT_SYMBOL(sysctl_ms_jiffies);
2841 EXPORT_SYMBOL(sysctl_string);
2842 EXPORT_SYMBOL(sysctl_data);
2843 EXPORT_SYMBOL(unregister_sysctl_table);