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sched: Ensure that a child can't gain time over it's parent after fork()
[mirror_ubuntu-zesty-kernel.git] / kernel / sysctl.c
CommitLineData
1da177e4
LT		 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
1da177e4
LT		 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>
72c2d582 27#include <linux/security.h>
1da177e4
LT		 28#include <linux/ctype.h>
29#include <linux/utsname.h>
dfec072e 30#include <linux/kmemcheck.h>
1da177e4 31#include <linux/smp_lock.h>
62239ac2 32#include <linux/fs.h>
1da177e4
LT		 33#include <linux/init.h>
34#include <linux/kernel.h>
0296b228 35#include <linux/kobject.h>
20380731 36#include <linux/net.h>
1da177e4
LT		 37#include <linux/sysrq.h>
38#include <linux/highuid.h>
39#include <linux/writeback.h>
40#include <linux/hugetlb.h>
1da177e4 41#include <linux/initrd.h>
0b77f5bf 42#include <linux/key.h>
1da177e4
LT		 43#include <linux/times.h>
44#include <linux/limits.h>
45#include <linux/dcache.h>
46#include <linux/syscalls.h>
c748e134 47#include <linux/vmstat.h>
c255d844
PM		 48#include <linux/nfs_fs.h>
49#include <linux/acpi.h>
10a0a8d4 50#include <linux/reboot.h>
b0fc494f 51#include <linux/ftrace.h>
788084ab 52#include <linux/security.h>
12e22c5e 53#include <linux/slow-work.h>
1ccd1549 54#include <linux/perf_counter.h>
1da177e4
LT		 55
56#include <asm/uaccess.h>
57#include <asm/processor.h>
58
29cbc78b
AK		 59#ifdef CONFIG_X86
60#include <asm/nmi.h>
0741f4d2 61#include <asm/stacktrace.h>
6e7c4025 62#include <asm/io.h>
29cbc78b
AK		 63#endif
64
7058cb02
EB		 65static int deprecated_sysctl_warning(struct __sysctl_args *args);
66
1da177e4
LT		 67#if defined(CONFIG_SYSCTL)
68
69/* External variables not in a header file. */
70extern int C_A_D;
45807a1d 71extern int print_fatal_signals;
1da177e4
LT		 72extern int sysctl_overcommit_memory;
73extern int sysctl_overcommit_ratio;
fadd8fbd 74extern int sysctl_panic_on_oom;
fe071d7e 75extern int sysctl_oom_kill_allocating_task;
fef1bdd6 76extern int sysctl_oom_dump_tasks;
1da177e4 77extern int max_threads;
1da177e4 78extern int core_uses_pid;
d6e71144 79extern int suid_dumpable;
1da177e4 80extern char core_pattern[];
1da177e4
LT		 81extern int pid_max;
82extern int min_free_kbytes;
1da177e4 83extern int pid_max_min, pid_max_max;
9d0243bc 84extern int sysctl_drop_caches;
8ad4b1fb 85extern int percpu_pagelist_fraction;
bebfa101 86extern int compat_log;
9745512c 87extern int latencytop_enabled;
eceea0b3 88extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 89#ifndef CONFIG_MMU
90extern int sysctl_nr_trim_pages;
91#endif
31a72bce
PM		 92#ifdef CONFIG_RCU_TORTURE_TEST
93extern int rcutorture_runnable;
94#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 95
c4f3b63f 96/* Constants used for minimum and maximum */
195cf453 97#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 98static int sixty = 60;
9383d967 99static int neg_one = -1;
c4f3b63f
RT		 100#endif
101
c4f3b63f 102static int zero;
cd5f9a4c
LT		 103static int __maybe_unused one = 1;
104static int __maybe_unused two = 2;
fc3501d4 105static unsigned long one_ul = 1;
c4f3b63f
RT		 106static int one_hundred = 100;
107
9e4a5bda
AR		 108/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
109static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
110
1da177e4
LT		 111/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
112static int maxolduid = 65535;
113static int minolduid;
8ad4b1fb 114static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 115
116static int ngroups_max = NGROUPS_MAX;
117
a1ef5adb 118#ifdef CONFIG_MODULES
1da177e4 119extern char modprobe_path[];
3d43321b 120extern int modules_disabled;
1da177e4 121#endif
1da177e4
LT		 122#ifdef CONFIG_CHR_DEV_SG
123extern int sg_big_buff;
124#endif
1da177e4 125
72c57ed5 126#ifdef CONFIG_SPARC
17f04fbb 127#include <asm/system.h>
1da177e4
LT		 128#endif
129
0871420f
DM		 130#ifdef CONFIG_SPARC64
131extern int sysctl_tsb_ratio;
132#endif
133
1da177e4
LT		 134#ifdef __hppa__
135extern int pwrsw_enabled;
136extern int unaligned_enabled;
137#endif
138
347a8dc3 139#ifdef CONFIG_S390
1da177e4
LT		 140#ifdef CONFIG_MATHEMU
141extern int sysctl_ieee_emulation_warnings;
142#endif
143extern int sysctl_userprocess_debug;
951f22d5 144extern int spin_retry;
1da177e4
LT		 145#endif
146
1da177e4
LT		 147#ifdef CONFIG_BSD_PROCESS_ACCT
148extern int acct_parm[];
149#endif
150
d2b176ed
JS		 151#ifdef CONFIG_IA64
152extern int no_unaligned_warning;
88fc241f 153extern int unaligned_dump_stack;
d2b176ed
JS		 154#endif
155
23f78d4a
IM		 156#ifdef CONFIG_RT_MUTEXES
157extern int max_lock_depth;
158#endif
159
d6f8ff73 160#ifdef CONFIG_PROC_SYSCTL
d8217f07 161static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 162 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 163static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 164 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 165#endif
9ec52099 166
d8217f07 167static struct ctl_table root_table[];
e51b6ba0
EB		 168static struct ctl_table_root sysctl_table_root;
169static struct ctl_table_header root_table_header = {
b380b0d4 170 .count = 1,
e51b6ba0 171 .ctl_table = root_table,
73455092 172 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 173 .root = &sysctl_table_root,
73455092 174 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 175};
176static struct ctl_table_root sysctl_table_root = {
177 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 178 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 179};
1da177e4 180
d8217f07
EB		 181static struct ctl_table kern_table[];
182static struct ctl_table vm_table[];
183static struct ctl_table fs_table[];
184static struct ctl_table debug_table[];
185static struct ctl_table dev_table[];
186extern struct ctl_table random_table[];
2d9048e2 187#ifdef CONFIG_INOTIFY_USER
d8217f07 188extern struct ctl_table inotify_table[];
0399cb08 189#endif
7ef9964e
DL		 190#ifdef CONFIG_EPOLL
191extern struct ctl_table epoll_table[];
192#endif
1da177e4
LT		 193
194#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
195int sysctl_legacy_va_layout;
196#endif
197
f20786ff
PZ		 198extern int prove_locking;
199extern int lock_stat;
9bc9a6bd 200
1da177e4
LT		 201/* The default sysctl tables: */
202
d8217f07 203static struct ctl_table root_table[] = {
1da177e4
LT		 204 {
205 .ctl_name = CTL_KERN,
206 .procname = "kernel",
207 .mode = 0555,
208 .child = kern_table,
209 },
210 {
211 .ctl_name = CTL_VM,
212 .procname = "vm",
213 .mode = 0555,
214 .child = vm_table,
215 },
1da177e4
LT		 216 {
217 .ctl_name = CTL_FS,
218 .procname = "fs",
219 .mode = 0555,
220 .child = fs_table,
221 },
222 {
223 .ctl_name = CTL_DEBUG,
224 .procname = "debug",
225 .mode = 0555,
226 .child = debug_table,
227 },
228 {
229 .ctl_name = CTL_DEV,
230 .procname = "dev",
231 .mode = 0555,
232 .child = dev_table,
233 },
2be7fe07
AM		 234/*
235 * NOTE: do not add new entries to this table unless you have read
236 * Documentation/sysctl/ctl_unnumbered.txt
237 */
1da177e4
LT		 238 { .ctl_name = 0 }
239};
240
77e54a1f 241#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 242static int min_sched_granularity_ns = 100000; /* 100 usecs */
243static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
244static int min_wakeup_granularity_ns; /* 0 usecs */
245static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 246#endif
247
d8217f07 248static struct ctl_table kern_table[] = {
77e54a1f
IM		 249#ifdef CONFIG_SCHED_DEBUG
250 {
251 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 252 .procname = "sched_min_granularity_ns",
253 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 254 .maxlen = sizeof(unsigned int),
255 .mode = 0644,
b2be5e96
PZ		 256 .proc_handler = &sched_nr_latency_handler,
257 .strategy = &sysctl_intvec,
258 .extra1 = &min_sched_granularity_ns,
259 .extra2 = &max_sched_granularity_ns,
77e54a1f 260 },
21805085
PZ		 261 {
262 .ctl_name = CTL_UNNUMBERED,
263 .procname = "sched_latency_ns",
264 .data = &sysctl_sched_latency,
265 .maxlen = sizeof(unsigned int),
266 .mode = 0644,
b2be5e96 267 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 268 .strategy = &sysctl_intvec,
269 .extra1 = &min_sched_granularity_ns,
270 .extra2 = &max_sched_granularity_ns,
271 },
77e54a1f
IM		 272 {
273 .ctl_name = CTL_UNNUMBERED,
274 .procname = "sched_wakeup_granularity_ns",
275 .data = &sysctl_sched_wakeup_granularity,
276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
278 .proc_handler = &proc_dointvec_minmax,
279 .strategy = &sysctl_intvec,
77e54a1f
IM		 280 .extra1 = &min_wakeup_granularity_ns,
281 .extra2 = &max_wakeup_granularity_ns,
282 },
2398f2c6
PZ		 283 {
284 .ctl_name = CTL_UNNUMBERED,
285 .procname = "sched_shares_ratelimit",
286 .data = &sysctl_sched_shares_ratelimit,
287 .maxlen = sizeof(unsigned int),
288 .mode = 0644,
289 .proc_handler = &proc_dointvec,
290 },
ffda12a1
PZ		 291 {
292 .ctl_name = CTL_UNNUMBERED,
293 .procname = "sched_shares_thresh",
294 .data = &sysctl_sched_shares_thresh,
295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
297 .proc_handler = &proc_dointvec_minmax,
298 .strategy = &sysctl_intvec,
299 .extra1 = &zero,
300 },
77e54a1f
IM		 301 {
302 .ctl_name = CTL_UNNUMBERED,
303 .procname = "sched_child_runs_first",
304 .data = &sysctl_sched_child_runs_first,
305 .maxlen = sizeof(unsigned int),
306 .mode = 0644,
307 .proc_handler = &proc_dointvec,
308 },
1fc84aaa
PZ		 309 {
310 .ctl_name = CTL_UNNUMBERED,
311 .procname = "sched_features",
312 .data = &sysctl_sched_features,
313 .maxlen = sizeof(unsigned int),
314 .mode = 0644,
315 .proc_handler = &proc_dointvec,
316 },
da84d961
IM		 317 {
318 .ctl_name = CTL_UNNUMBERED,
319 .procname = "sched_migration_cost",
320 .data = &sysctl_sched_migration_cost,
321 .maxlen = sizeof(unsigned int),
322 .mode = 0644,
323 .proc_handler = &proc_dointvec,
324 },
b82d9fdd
PZ		 325 {
326 .ctl_name = CTL_UNNUMBERED,
327 .procname = "sched_nr_migrate",
328 .data = &sysctl_sched_nr_migrate,
329 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 330 .mode = 0644,
331 .proc_handler = &proc_dointvec,
332 },
e9e9250b
PZ		 333 {
334 .ctl_name = CTL_UNNUMBERED,
335 .procname = "sched_time_avg",
336 .data = &sysctl_sched_time_avg,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
339 .proc_handler = &proc_dointvec,
340 },
cd1bb94b
AB		 341 {
342 .ctl_name = CTL_UNNUMBERED,
343 .procname = "timer_migration",
344 .data = &sysctl_timer_migration,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
bfdb4d9f
AB		 347 .proc_handler = &proc_dointvec_minmax,
348 .strategy = &sysctl_intvec,
349 .extra1 = &zero,
350 .extra2 = &one,
fa85ae24 351 },
1fc84aaa 352#endif
9f0c1e56
PZ		 353 {
354 .ctl_name = CTL_UNNUMBERED,
355 .procname = "sched_rt_period_us",
356 .data = &sysctl_sched_rt_period,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
d0b27fa7 359 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 360 },
361 {
362 .ctl_name = CTL_UNNUMBERED,
363 .procname = "sched_rt_runtime_us",
364 .data = &sysctl_sched_rt_runtime,
365 .maxlen = sizeof(int),
366 .mode = 0644,
d0b27fa7 367 .proc_handler = &sched_rt_handler,
9f0c1e56 368 },
1799e35d
IM		 369 {
370 .ctl_name = CTL_UNNUMBERED,
371 .procname = "sched_compat_yield",
372 .data = &sysctl_sched_compat_yield,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = &proc_dointvec,
376 },
f20786ff
PZ		 377#ifdef CONFIG_PROVE_LOCKING
378 {
379 .ctl_name = CTL_UNNUMBERED,
380 .procname = "prove_locking",
381 .data = &prove_locking,
382 .maxlen = sizeof(int),
383 .mode = 0644,
384 .proc_handler = &proc_dointvec,
385 },
386#endif
387#ifdef CONFIG_LOCK_STAT
388 {
389 .ctl_name = CTL_UNNUMBERED,
390 .procname = "lock_stat",
391 .data = &lock_stat,
392 .maxlen = sizeof(int),
393 .mode = 0644,
394 .proc_handler = &proc_dointvec,
395 },
77e54a1f 396#endif
1da177e4
LT		 397 {
398 .ctl_name = KERN_PANIC,
399 .procname = "panic",
400 .data = &panic_timeout,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = &proc_dointvec,
404 },
405 {
406 .ctl_name = KERN_CORE_USES_PID,
407 .procname = "core_uses_pid",
408 .data = &core_uses_pid,
409 .maxlen = sizeof(int),
410 .mode = 0644,
411 .proc_handler = &proc_dointvec,
412 },
413 {
414 .ctl_name = KERN_CORE_PATTERN,
415 .procname = "core_pattern",
416 .data = core_pattern,
71ce92f3 417 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 418 .mode = 0644,
419 .proc_handler = &proc_dostring,
420 .strategy = &sysctl_string,
421 },
34f5a398 422#ifdef CONFIG_PROC_SYSCTL
1da177e4 423 {
1da177e4 424 .procname = "tainted",
25ddbb18 425 .maxlen = sizeof(long),
34f5a398 426 .mode = 0644,
25ddbb18 427 .proc_handler = &proc_taint,
1da177e4 428 },
34f5a398 429#endif
9745512c
AV		 430#ifdef CONFIG_LATENCYTOP
431 {
432 .procname = "latencytop",
433 .data = &latencytop_enabled,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = &proc_dointvec,
437 },
438#endif
1da177e4
LT		 439#ifdef CONFIG_BLK_DEV_INITRD
440 {
441 .ctl_name = KERN_REALROOTDEV,
442 .procname = "real-root-dev",
443 .data = &real_root_dev,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = &proc_dointvec,
447 },
448#endif
45807a1d
IM		 449 {
450 .ctl_name = CTL_UNNUMBERED,
451 .procname = "print-fatal-signals",
452 .data = &print_fatal_signals,
453 .maxlen = sizeof(int),
454 .mode = 0644,
455 .proc_handler = &proc_dointvec,
456 },
72c57ed5 457#ifdef CONFIG_SPARC
1da177e4
LT		 458 {
459 .ctl_name = KERN_SPARC_REBOOT,
460 .procname = "reboot-cmd",
461 .data = reboot_command,
462 .maxlen = 256,
463 .mode = 0644,
464 .proc_handler = &proc_dostring,
465 .strategy = &sysctl_string,
466 },
467 {
468 .ctl_name = KERN_SPARC_STOP_A,
469 .procname = "stop-a",
470 .data = &stop_a_enabled,
471 .maxlen = sizeof (int),
472 .mode = 0644,
473 .proc_handler = &proc_dointvec,
474 },
475 {
476 .ctl_name = KERN_SPARC_SCONS_PWROFF,
477 .procname = "scons-poweroff",
478 .data = &scons_pwroff,
479 .maxlen = sizeof (int),
480 .mode = 0644,
481 .proc_handler = &proc_dointvec,
482 },
483#endif
0871420f
DM		 484#ifdef CONFIG_SPARC64
485 {
486 .ctl_name = CTL_UNNUMBERED,
487 .procname = "tsb-ratio",
488 .data = &sysctl_tsb_ratio,
489 .maxlen = sizeof (int),
490 .mode = 0644,
491 .proc_handler = &proc_dointvec,
492 },
493#endif
1da177e4
LT		 494#ifdef __hppa__
495 {
496 .ctl_name = KERN_HPPA_PWRSW,
497 .procname = "soft-power",
498 .data = &pwrsw_enabled,
499 .maxlen = sizeof (int),
500 .mode = 0644,
501 .proc_handler = &proc_dointvec,
502 },
503 {
504 .ctl_name = KERN_HPPA_UNALIGNED,
505 .procname = "unaligned-trap",
506 .data = &unaligned_enabled,
507 .maxlen = sizeof (int),
508 .mode = 0644,
509 .proc_handler = &proc_dointvec,
510 },
511#endif
512 {
513 .ctl_name = KERN_CTLALTDEL,
514 .procname = "ctrl-alt-del",
515 .data = &C_A_D,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = &proc_dointvec,
519 },
606576ce 520#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 521 {
522 .ctl_name = CTL_UNNUMBERED,
523 .procname = "ftrace_enabled",
524 .data = &ftrace_enabled,
525 .maxlen = sizeof(int),
526 .mode = 0644,
527 .proc_handler = &ftrace_enable_sysctl,
528 },
529#endif
f38f1d2a
SR		 530#ifdef CONFIG_STACK_TRACER
531 {
532 .ctl_name = CTL_UNNUMBERED,
533 .procname = "stack_tracer_enabled",
534 .data = &stack_tracer_enabled,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = &stack_trace_sysctl,
538 },
539#endif
944ac425
SR		 540#ifdef CONFIG_TRACING
541 {
542 .ctl_name = CTL_UNNUMBERED,
3299b4dd 543 .procname = "ftrace_dump_on_oops",
944ac425
SR		 544 .data = &ftrace_dump_on_oops,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = &proc_dointvec,
548 },
549#endif
a1ef5adb 550#ifdef CONFIG_MODULES
1da177e4
LT		 551 {
552 .ctl_name = KERN_MODPROBE,
553 .procname = "modprobe",
554 .data = &modprobe_path,
555 .maxlen = KMOD_PATH_LEN,
556 .mode = 0644,
557 .proc_handler = &proc_dostring,
558 .strategy = &sysctl_string,
559 },
3d43321b
KC		 560 {
561 .ctl_name = CTL_UNNUMBERED,
562 .procname = "modules_disabled",
563 .data = &modules_disabled,
564 .maxlen = sizeof(int),
565 .mode = 0644,
566 /* only handle a transition from default "0" to "1" */
567 .proc_handler = &proc_dointvec_minmax,
568 .extra1 = &one,
569 .extra2 = &one,
570 },
1da177e4 571#endif
57ae2508 572#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 573 {
574 .ctl_name = KERN_HOTPLUG,
575 .procname = "hotplug",
312c004d
KS		 576 .data = &uevent_helper,
577 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 578 .mode = 0644,
579 .proc_handler = &proc_dostring,
580 .strategy = &sysctl_string,
581 },
582#endif
583#ifdef CONFIG_CHR_DEV_SG
584 {
585 .ctl_name = KERN_SG_BIG_BUFF,
586 .procname = "sg-big-buff",
587 .data = &sg_big_buff,
588 .maxlen = sizeof (int),
589 .mode = 0444,
590 .proc_handler = &proc_dointvec,
591 },
592#endif
593#ifdef CONFIG_BSD_PROCESS_ACCT
594 {
595 .ctl_name = KERN_ACCT,
596 .procname = "acct",
597 .data = &acct_parm,
598 .maxlen = 3*sizeof(int),
599 .mode = 0644,
600 .proc_handler = &proc_dointvec,
601 },
602#endif
1da177e4
LT		 603#ifdef CONFIG_MAGIC_SYSRQ
604 {
605 .ctl_name = KERN_SYSRQ,
606 .procname = "sysrq",
5d6f647f 607 .data = &__sysrq_enabled,
1da177e4
LT		 608 .maxlen = sizeof (int),
609 .mode = 0644,
610 .proc_handler = &proc_dointvec,
611 },
612#endif
d6f8ff73 613#ifdef CONFIG_PROC_SYSCTL
1da177e4 614 {
1da177e4 615 .procname = "cad_pid",
9ec52099 616 .data = NULL,
1da177e4
LT		 617 .maxlen = sizeof (int),
618 .mode = 0600,
9ec52099 619 .proc_handler = &proc_do_cad_pid,
1da177e4 620 },
d6f8ff73 621#endif
1da177e4
LT		 622 {
623 .ctl_name = KERN_MAX_THREADS,
624 .procname = "threads-max",
625 .data = &max_threads,
626 .maxlen = sizeof(int),
627 .mode = 0644,
628 .proc_handler = &proc_dointvec,
629 },
630 {
631 .ctl_name = KERN_RANDOM,
632 .procname = "random",
633 .mode = 0555,
634 .child = random_table,
635 },
1da177e4
LT		 636 {
637 .ctl_name = KERN_OVERFLOWUID,
638 .procname = "overflowuid",
639 .data = &overflowuid,
640 .maxlen = sizeof(int),
641 .mode = 0644,
642 .proc_handler = &proc_dointvec_minmax,
643 .strategy = &sysctl_intvec,
644 .extra1 = &minolduid,
645 .extra2 = &maxolduid,
646 },
647 {
648 .ctl_name = KERN_OVERFLOWGID,
649 .procname = "overflowgid",
650 .data = &overflowgid,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = &proc_dointvec_minmax,
654 .strategy = &sysctl_intvec,
655 .extra1 = &minolduid,
656 .extra2 = &maxolduid,
657 },
347a8dc3 658#ifdef CONFIG_S390
1da177e4
LT		 659#ifdef CONFIG_MATHEMU
660 {
661 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
662 .procname = "ieee_emulation_warnings",
663 .data = &sysctl_ieee_emulation_warnings,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 .proc_handler = &proc_dointvec,
667 },
1da177e4
LT		 668#endif
669 {
670 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
671 .procname = "userprocess_debug",
672 .data = &sysctl_userprocess_debug,
673 .maxlen = sizeof(int),
674 .mode = 0644,
675 .proc_handler = &proc_dointvec,
676 },
677#endif
678 {
679 .ctl_name = KERN_PIDMAX,
680 .procname = "pid_max",
681 .data = &pid_max,
682 .maxlen = sizeof (int),
683 .mode = 0644,
684 .proc_handler = &proc_dointvec_minmax,
685 .strategy = sysctl_intvec,
686 .extra1 = &pid_max_min,
687 .extra2 = &pid_max_max,
688 },
689 {
690 .ctl_name = KERN_PANIC_ON_OOPS,
691 .procname = "panic_on_oops",
692 .data = &panic_on_oops,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = &proc_dointvec,
696 },
7ef3d2fd
JP		 697#if defined CONFIG_PRINTK
698 {
699 .ctl_name = KERN_PRINTK,
700 .procname = "printk",
701 .data = &console_loglevel,
702 .maxlen = 4*sizeof(int),
703 .mode = 0644,
704 .proc_handler = &proc_dointvec,
705 },
1da177e4
LT		 706 {
707 .ctl_name = KERN_PRINTK_RATELIMIT,
708 .procname = "printk_ratelimit",
717115e1 709 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = &proc_dointvec_jiffies,
713 .strategy = &sysctl_jiffies,
714 },
715 {
716 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
717 .procname = "printk_ratelimit_burst",
717115e1 718 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = &proc_dointvec,
722 },
7ef3d2fd 723#endif
1da177e4
LT		 724 {
725 .ctl_name = KERN_NGROUPS_MAX,
726 .procname = "ngroups_max",
727 .data = &ngroups_max,
728 .maxlen = sizeof (int),
729 .mode = 0444,
730 .proc_handler = &proc_dointvec,
731 },
732#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
733 {
734 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
735 .procname = "unknown_nmi_panic",
736 .data = &unknown_nmi_panic,
737 .maxlen = sizeof (int),
738 .mode = 0644,
2fbe7b25 739 .proc_handler = &proc_dointvec,
1da177e4 740 },
407984f1 741 {
407984f1
DZ		 742 .procname = "nmi_watchdog",
743 .data = &nmi_watchdog_enabled,
744 .maxlen = sizeof (int),
745 .mode = 0644,
746 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 747 },
748#endif
749#if defined(CONFIG_X86)
8da5adda
DZ		 750 {
751 .ctl_name = KERN_PANIC_ON_NMI,
752 .procname = "panic_on_unrecovered_nmi",
753 .data = &panic_on_unrecovered_nmi,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = &proc_dointvec,
757 },
5211a242
KG		 758 {
759 .ctl_name = CTL_UNNUMBERED,
760 .procname = "panic_on_io_nmi",
761 .data = &panic_on_io_nmi,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = &proc_dointvec,
765 },
1da177e4
LT		 766 {
767 .ctl_name = KERN_BOOTLOADER_TYPE,
768 .procname = "bootloader_type",
769 .data = &bootloader_type,
770 .maxlen = sizeof (int),
771 .mode = 0444,
772 .proc_handler = &proc_dointvec,
773 },
5031296c
PA		 774 {
775 .ctl_name = CTL_UNNUMBERED,
776 .procname = "bootloader_version",
777 .data = &bootloader_version,
778 .maxlen = sizeof (int),
779 .mode = 0444,
780 .proc_handler = &proc_dointvec,
781 },
0741f4d2
CE		 782 {
783 .ctl_name = CTL_UNNUMBERED,
784 .procname = "kstack_depth_to_print",
785 .data = &kstack_depth_to_print,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = &proc_dointvec,
789 },
6e7c4025
IM		 790 {
791 .ctl_name = CTL_UNNUMBERED,
792 .procname = "io_delay_type",
793 .data = &io_delay_type,
794 .maxlen = sizeof(int),
795 .mode = 0644,
796 .proc_handler = &proc_dointvec,
797 },
1da177e4 798#endif
7a9166e3 799#if defined(CONFIG_MMU)
1da177e4
LT		 800 {
801 .ctl_name = KERN_RANDOMIZE,
802 .procname = "randomize_va_space",
803 .data = &randomize_va_space,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = &proc_dointvec,
807 },
7a9166e3 808#endif
0152fb37 809#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 810 {
811 .ctl_name = KERN_SPIN_RETRY,
812 .procname = "spin_retry",
813 .data = &spin_retry,
814 .maxlen = sizeof (int),
815 .mode = 0644,
816 .proc_handler = &proc_dointvec,
817 },
c255d844 818#endif
673d5b43 819#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 820 {
c255d844 821 .procname = "acpi_video_flags",
77afcf78 822 .data = &acpi_realmode_flags,
c255d844
PM		 823 .maxlen = sizeof (unsigned long),
824 .mode = 0644,
7f99f06f 825 .proc_handler = &proc_doulongvec_minmax,
c255d844 826 },
d2b176ed
JS		 827#endif
828#ifdef CONFIG_IA64
829 {
830 .ctl_name = KERN_IA64_UNALIGNED,
831 .procname = "ignore-unaligned-usertrap",
832 .data = &no_unaligned_warning,
833 .maxlen = sizeof (int),
834 .mode = 0644,
835 .proc_handler = &proc_dointvec,
836 },
88fc241f
DC		 837 {
838 .ctl_name = CTL_UNNUMBERED,
839 .procname = "unaligned-dump-stack",
840 .data = &unaligned_dump_stack,
841 .maxlen = sizeof (int),
842 .mode = 0644,
843 .proc_handler = &proc_dointvec,
844 },
bebfa101 845#endif
c4f3b63f 846#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 847 {
848 .ctl_name = CTL_UNNUMBERED,
849 .procname = "softlockup_panic",
850 .data = &softlockup_panic,
851 .maxlen = sizeof(int),
852 .mode = 0644,
4dca10a9 853 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 854 .strategy = &sysctl_intvec,
855 .extra1 = &zero,
856 .extra2 = &one,
857 },
c4f3b63f
RT		 858 {
859 .ctl_name = CTL_UNNUMBERED,
860 .procname = "softlockup_thresh",
861 .data = &softlockup_thresh,
9383d967 862 .maxlen = sizeof(int),
c4f3b63f 863 .mode = 0644,
baf48f65 864 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 865 .strategy = &sysctl_intvec,
9383d967 866 .extra1 = &neg_one,
c4f3b63f
RT		 867 .extra2 = &sixty,
868 },
e162b39a
MSB		 869#endif
870#ifdef CONFIG_DETECT_HUNG_TASK
871 {
872 .ctl_name = CTL_UNNUMBERED,
873 .procname = "hung_task_panic",
874 .data = &sysctl_hung_task_panic,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = &proc_dointvec_minmax,
878 .strategy = &sysctl_intvec,
879 .extra1 = &zero,
880 .extra2 = &one,
881 },
82a1fcb9
IM		 882 {
883 .ctl_name = CTL_UNNUMBERED,
884 .procname = "hung_task_check_count",
885 .data = &sysctl_hung_task_check_count,
90739081 886 .maxlen = sizeof(unsigned long),
82a1fcb9 887 .mode = 0644,
90739081 888 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 889 .strategy = &sysctl_intvec,
890 },
891 {
892 .ctl_name = CTL_UNNUMBERED,
893 .procname = "hung_task_timeout_secs",
894 .data = &sysctl_hung_task_timeout_secs,
90739081 895 .maxlen = sizeof(unsigned long),
82a1fcb9 896 .mode = 0644,
e162b39a 897 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 898 .strategy = &sysctl_intvec,
899 },
900 {
901 .ctl_name = CTL_UNNUMBERED,
902 .procname = "hung_task_warnings",
903 .data = &sysctl_hung_task_warnings,
90739081 904 .maxlen = sizeof(unsigned long),
82a1fcb9 905 .mode = 0644,
90739081 906 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 907 .strategy = &sysctl_intvec,
908 },
c4f3b63f 909#endif
bebfa101
AK		 910#ifdef CONFIG_COMPAT
911 {
912 .ctl_name = KERN_COMPAT_LOG,
913 .procname = "compat-log",
914 .data = &compat_log,
915 .maxlen = sizeof (int),
916 .mode = 0644,
917 .proc_handler = &proc_dointvec,
918 },
951f22d5 919#endif
23f78d4a
IM		 920#ifdef CONFIG_RT_MUTEXES
921 {
922 .ctl_name = KERN_MAX_LOCK_DEPTH,
923 .procname = "max_lock_depth",
924 .data = &max_lock_depth,
925 .maxlen = sizeof(int),
926 .mode = 0644,
927 .proc_handler = &proc_dointvec,
928 },
5096add8 929#endif
10a0a8d4
JF		 930 {
931 .ctl_name = CTL_UNNUMBERED,
932 .procname = "poweroff_cmd",
933 .data = &poweroff_cmd,
934 .maxlen = POWEROFF_CMD_PATH_LEN,
935 .mode = 0644,
936 .proc_handler = &proc_dostring,
937 .strategy = &sysctl_string,
938 },
0b77f5bf
DH		 939#ifdef CONFIG_KEYS
940 {
941 .ctl_name = CTL_UNNUMBERED,
942 .procname = "keys",
943 .mode = 0555,
944 .child = key_sysctls,
945 },
946#endif
31a72bce
PM		 947#ifdef CONFIG_RCU_TORTURE_TEST
948 {
949 .ctl_name = CTL_UNNUMBERED,
950 .procname = "rcutorture_runnable",
951 .data = &rcutorture_runnable,
952 .maxlen = sizeof(int),
953 .mode = 0644,
954 .proc_handler = &proc_dointvec,
955 },
956#endif
12e22c5e
DH		 957#ifdef CONFIG_SLOW_WORK
958 {
959 .ctl_name = CTL_UNNUMBERED,
960 .procname = "slow-work",
961 .mode = 0555,
962 .child = slow_work_sysctls,
963 },
964#endif
1ccd1549
PZ		 965#ifdef CONFIG_PERF_COUNTERS
966 {
967 .ctl_name = CTL_UNNUMBERED,
0764771d
PZ		 968 .procname = "perf_counter_paranoid",
969 .data = &sysctl_perf_counter_paranoid,
970 .maxlen = sizeof(sysctl_perf_counter_paranoid),
1ccd1549
PZ		 971 .mode = 0644,
972 .proc_handler = &proc_dointvec,
973 },
c5078f78
PZ		 974 {
975 .ctl_name = CTL_UNNUMBERED,
976 .procname = "perf_counter_mlock_kb",
977 .data = &sysctl_perf_counter_mlock,
978 .maxlen = sizeof(sysctl_perf_counter_mlock),
979 .mode = 0644,
980 .proc_handler = &proc_dointvec,
981 },
a78ac325
PZ		 982 {
983 .ctl_name = CTL_UNNUMBERED,
df58ab24
PZ		 984 .procname = "perf_counter_max_sample_rate",
985 .data = &sysctl_perf_counter_sample_rate,
986 .maxlen = sizeof(sysctl_perf_counter_sample_rate),
a78ac325
PZ		 987 .mode = 0644,
988 .proc_handler = &proc_dointvec,
989 },
1ccd1549 990#endif
dfec072e
VN		 991#ifdef CONFIG_KMEMCHECK
992 {
993 .ctl_name = CTL_UNNUMBERED,
994 .procname = "kmemcheck",
995 .data = &kmemcheck_enabled,
996 .maxlen = sizeof(int),
997 .mode = 0644,
998 .proc_handler = &proc_dointvec,
999 },
1000#endif
1001
ed2c12f3
AM		 1002/*
1003 * NOTE: do not add new entries to this table unless you have read
1004 * Documentation/sysctl/ctl_unnumbered.txt
1005 */
1da177e4
LT		 1006 { .ctl_name = 0 }
1007};
1008
d8217f07 1009static struct ctl_table vm_table[] = {
1da177e4
LT		 1010 {
1011 .ctl_name = VM_OVERCOMMIT_MEMORY,
1012 .procname = "overcommit_memory",
1013 .data = &sysctl_overcommit_memory,
1014 .maxlen = sizeof(sysctl_overcommit_memory),
1015 .mode = 0644,
1016 .proc_handler = &proc_dointvec,
1017 },
fadd8fbd
KH		 1018 {
1019 .ctl_name = VM_PANIC_ON_OOM,
1020 .procname = "panic_on_oom",
1021 .data = &sysctl_panic_on_oom,
1022 .maxlen = sizeof(sysctl_panic_on_oom),
1023 .mode = 0644,
1024 .proc_handler = &proc_dointvec,
1025 },
fe071d7e
DR		 1026 {
1027 .ctl_name = CTL_UNNUMBERED,
1028 .procname = "oom_kill_allocating_task",
1029 .data = &sysctl_oom_kill_allocating_task,
1030 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1031 .mode = 0644,
1032 .proc_handler = &proc_dointvec,
1033 },
fef1bdd6
DR		 1034 {
1035 .ctl_name = CTL_UNNUMBERED,
1036 .procname = "oom_dump_tasks",
1037 .data = &sysctl_oom_dump_tasks,
1038 .maxlen = sizeof(sysctl_oom_dump_tasks),
1039 .mode = 0644,
1040 .proc_handler = &proc_dointvec,
1041 },
1da177e4
LT		 1042 {
1043 .ctl_name = VM_OVERCOMMIT_RATIO,
1044 .procname = "overcommit_ratio",
1045 .data = &sysctl_overcommit_ratio,
1046 .maxlen = sizeof(sysctl_overcommit_ratio),
1047 .mode = 0644,
1048 .proc_handler = &proc_dointvec,
1049 },
1050 {
1051 .ctl_name = VM_PAGE_CLUSTER,
1052 .procname = "page-cluster",
1053 .data = &page_cluster,
1054 .maxlen = sizeof(int),
1055 .mode = 0644,
1056 .proc_handler = &proc_dointvec,
1057 },
1058 {
1059 .ctl_name = VM_DIRTY_BACKGROUND,
1060 .procname = "dirty_background_ratio",
1061 .data = &dirty_background_ratio,
1062 .maxlen = sizeof(dirty_background_ratio),
1063 .mode = 0644,
2da02997 1064 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 1065 .strategy = &sysctl_intvec,
1066 .extra1 = &zero,
1067 .extra2 = &one_hundred,
1068 },
2da02997
DR		 1069 {
1070 .ctl_name = CTL_UNNUMBERED,
1071 .procname = "dirty_background_bytes",
1072 .data = &dirty_background_bytes,
1073 .maxlen = sizeof(dirty_background_bytes),
1074 .mode = 0644,
1075 .proc_handler = &dirty_background_bytes_handler,
1076 .strategy = &sysctl_intvec,
fc3501d4 1077 .extra1 = &one_ul,
2da02997 1078 },
1da177e4
LT		 1079 {
1080 .ctl_name = VM_DIRTY_RATIO,
1081 .procname = "dirty_ratio",
1082 .data = &vm_dirty_ratio,
1083 .maxlen = sizeof(vm_dirty_ratio),
1084 .mode = 0644,
04fbfdc1 1085 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1086 .strategy = &sysctl_intvec,
1087 .extra1 = &zero,
1088 .extra2 = &one_hundred,
1089 },
2da02997
DR		 1090 {
1091 .ctl_name = CTL_UNNUMBERED,
1092 .procname = "dirty_bytes",
1093 .data = &vm_dirty_bytes,
1094 .maxlen = sizeof(vm_dirty_bytes),
1095 .mode = 0644,
1096 .proc_handler = &dirty_bytes_handler,
1097 .strategy = &sysctl_intvec,
9e4a5bda 1098 .extra1 = &dirty_bytes_min,
2da02997 1099 },
1da177e4 1100 {
1da177e4 1101 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1102 .data = &dirty_writeback_interval,
1103 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1104 .mode = 0644,
1105 .proc_handler = &dirty_writeback_centisecs_handler,
1106 },
1107 {
1da177e4 1108 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1109 .data = &dirty_expire_interval,
1110 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1111 .mode = 0644,
704503d8 1112 .proc_handler = &proc_dointvec,
1da177e4
LT		 1113 },
1114 {
1115 .ctl_name = VM_NR_PDFLUSH_THREADS,
1116 .procname = "nr_pdflush_threads",
1117 .data = &nr_pdflush_threads,
1118 .maxlen = sizeof nr_pdflush_threads,
1119 .mode = 0444 /* read-only*/,
1120 .proc_handler = &proc_dointvec,
1121 },
1122 {
1123 .ctl_name = VM_SWAPPINESS,
1124 .procname = "swappiness",
1125 .data = &vm_swappiness,
1126 .maxlen = sizeof(vm_swappiness),
1127 .mode = 0644,
1128 .proc_handler = &proc_dointvec_minmax,
1129 .strategy = &sysctl_intvec,
1130 .extra1 = &zero,
1131 .extra2 = &one_hundred,
1132 },
1133#ifdef CONFIG_HUGETLB_PAGE
1134 {
1da177e4 1135 .procname = "nr_hugepages",
e5ff2159 1136 .data = NULL,
1da177e4
LT		 1137 .maxlen = sizeof(unsigned long),
1138 .mode = 0644,
1139 .proc_handler = &hugetlb_sysctl_handler,
1140 .extra1 = (void *)&hugetlb_zero,
1141 .extra2 = (void *)&hugetlb_infinity,
1142 },
1143 {
1144 .ctl_name = VM_HUGETLB_GROUP,
1145 .procname = "hugetlb_shm_group",
1146 .data = &sysctl_hugetlb_shm_group,
1147 .maxlen = sizeof(gid_t),
1148 .mode = 0644,
1149 .proc_handler = &proc_dointvec,
1150 },
396faf03
MG		 1151 {
1152 .ctl_name = CTL_UNNUMBERED,
1153 .procname = "hugepages_treat_as_movable",
1154 .data = &hugepages_treat_as_movable,
1155 .maxlen = sizeof(int),
1156 .mode = 0644,
1157 .proc_handler = &hugetlb_treat_movable_handler,
1158 },
d1c3fb1f
NA		 1159 {
1160 .ctl_name = CTL_UNNUMBERED,
1161 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1162 .data = NULL,
1163 .maxlen = sizeof(unsigned long),
d1c3fb1f 1164 .mode = 0644,
a3d0c6aa 1165 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1166 .extra1 = (void *)&hugetlb_zero,
1167 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1168 },
1da177e4
LT		 1169#endif
1170 {
1171 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1172 .procname = "lowmem_reserve_ratio",
1173 .data = &sysctl_lowmem_reserve_ratio,
1174 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1175 .mode = 0644,
1176 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1177 .strategy = &sysctl_intvec,
1178 },
9d0243bc
AM		 1179 {
1180 .ctl_name = VM_DROP_PAGECACHE,
1181 .procname = "drop_caches",
1182 .data = &sysctl_drop_caches,
1183 .maxlen = sizeof(int),
1184 .mode = 0644,
1185 .proc_handler = drop_caches_sysctl_handler,
1186 .strategy = &sysctl_intvec,
1187 },
1da177e4
LT		 1188 {
1189 .ctl_name = VM_MIN_FREE_KBYTES,
1190 .procname = "min_free_kbytes",
1191 .data = &min_free_kbytes,
1192 .maxlen = sizeof(min_free_kbytes),
1193 .mode = 0644,
1194 .proc_handler = &min_free_kbytes_sysctl_handler,
1195 .strategy = &sysctl_intvec,
1196 .extra1 = &zero,
1197 },
8ad4b1fb
RS		 1198 {
1199 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1200 .procname = "percpu_pagelist_fraction",
1201 .data = &percpu_pagelist_fraction,
1202 .maxlen = sizeof(percpu_pagelist_fraction),
1203 .mode = 0644,
1204 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1205 .strategy = &sysctl_intvec,
1206 .extra1 = &min_percpu_pagelist_fract,
1207 },
1da177e4
LT		 1208#ifdef CONFIG_MMU
1209 {
1210 .ctl_name = VM_MAX_MAP_COUNT,
1211 .procname = "max_map_count",
1212 .data = &sysctl_max_map_count,
1213 .maxlen = sizeof(sysctl_max_map_count),
1214 .mode = 0644,
1215 .proc_handler = &proc_dointvec
1216 },
dd8632a1
PM		 1217#else
1218 {
1219 .ctl_name = CTL_UNNUMBERED,
1220 .procname = "nr_trim_pages",
1221 .data = &sysctl_nr_trim_pages,
1222 .maxlen = sizeof(sysctl_nr_trim_pages),
1223 .mode = 0644,
1224 .proc_handler = &proc_dointvec_minmax,
1225 .strategy = &sysctl_intvec,
1226 .extra1 = &zero,
1227 },
1da177e4
LT		 1228#endif
1229 {
1230 .ctl_name = VM_LAPTOP_MODE,
1231 .procname = "laptop_mode",
1232 .data = &laptop_mode,
1233 .maxlen = sizeof(laptop_mode),
1234 .mode = 0644,
ed5b43f1
BS		 1235 .proc_handler = &proc_dointvec_jiffies,
1236 .strategy = &sysctl_jiffies,
1da177e4
LT		 1237 },
1238 {
1239 .ctl_name = VM_BLOCK_DUMP,
1240 .procname = "block_dump",
1241 .data = &block_dump,
1242 .maxlen = sizeof(block_dump),
1243 .mode = 0644,
1244 .proc_handler = &proc_dointvec,
1245 .strategy = &sysctl_intvec,
1246 .extra1 = &zero,
1247 },
1248 {
1249 .ctl_name = VM_VFS_CACHE_PRESSURE,
1250 .procname = "vfs_cache_pressure",
1251 .data = &sysctl_vfs_cache_pressure,
1252 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1253 .mode = 0644,
1254 .proc_handler = &proc_dointvec,
1255 .strategy = &sysctl_intvec,
1256 .extra1 = &zero,
1257 },
1258#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1259 {
1260 .ctl_name = VM_LEGACY_VA_LAYOUT,
1261 .procname = "legacy_va_layout",
1262 .data = &sysctl_legacy_va_layout,
1263 .maxlen = sizeof(sysctl_legacy_va_layout),
1264 .mode = 0644,
1265 .proc_handler = &proc_dointvec,
1266 .strategy = &sysctl_intvec,
1267 .extra1 = &zero,
1268 },
1269#endif
1743660b
CL		 1270#ifdef CONFIG_NUMA
1271 {
1272 .ctl_name = VM_ZONE_RECLAIM_MODE,
1273 .procname = "zone_reclaim_mode",
1274 .data = &zone_reclaim_mode,
1275 .maxlen = sizeof(zone_reclaim_mode),
1276 .mode = 0644,
1277 .proc_handler = &proc_dointvec,
c84db23c
CL		 1278 .strategy = &sysctl_intvec,
1279 .extra1 = &zero,
1743660b 1280 },
9614634f
CL		 1281 {
1282 .ctl_name = VM_MIN_UNMAPPED,
1283 .procname = "min_unmapped_ratio",
1284 .data = &sysctl_min_unmapped_ratio,
1285 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1286 .mode = 0644,
1287 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1288 .strategy = &sysctl_intvec,
1289 .extra1 = &zero,
1290 .extra2 = &one_hundred,
1291 },
0ff38490
CL		 1292 {
1293 .ctl_name = VM_MIN_SLAB,
1294 .procname = "min_slab_ratio",
1295 .data = &sysctl_min_slab_ratio,
1296 .maxlen = sizeof(sysctl_min_slab_ratio),
1297 .mode = 0644,
1298 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1299 .strategy = &sysctl_intvec,
1300 .extra1 = &zero,
1301 .extra2 = &one_hundred,
1302 },
e6e5494c 1303#endif
77461ab3
CL		 1304#ifdef CONFIG_SMP
1305 {
1306 .ctl_name = CTL_UNNUMBERED,
1307 .procname = "stat_interval",
1308 .data = &sysctl_stat_interval,
1309 .maxlen = sizeof(sysctl_stat_interval),
1310 .mode = 0644,
1311 .proc_handler = &proc_dointvec_jiffies,
1312 .strategy = &sysctl_jiffies,
1313 },
1314#endif
ed032189
EP		 1315 {
1316 .ctl_name = CTL_UNNUMBERED,
1317 .procname = "mmap_min_addr",
788084ab
EP		 1318 .data = &dac_mmap_min_addr,
1319 .maxlen = sizeof(unsigned long),
ed032189 1320 .mode = 0644,
788084ab 1321 .proc_handler = &mmap_min_addr_handler,
ed032189 1322 },
f0c0b2b8
KH		 1323#ifdef CONFIG_NUMA
1324 {
1325 .ctl_name = CTL_UNNUMBERED,
1326 .procname = "numa_zonelist_order",
1327 .data = &numa_zonelist_order,
1328 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1329 .mode = 0644,
1330 .proc_handler = &numa_zonelist_order_handler,
1331 .strategy = &sysctl_string,
1332 },
1333#endif
2b8232ce 1334#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1335 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1336 {
1337 .ctl_name = VM_VDSO_ENABLED,
1338 .procname = "vdso_enabled",
1339 .data = &vdso_enabled,
1340 .maxlen = sizeof(vdso_enabled),
1341 .mode = 0644,
1342 .proc_handler = &proc_dointvec,
1343 .strategy = &sysctl_intvec,
1344 .extra1 = &zero,
1345 },
1da177e4 1346#endif
195cf453
BG		 1347#ifdef CONFIG_HIGHMEM
1348 {
1349 .ctl_name = CTL_UNNUMBERED,
1350 .procname = "highmem_is_dirtyable",
1351 .data = &vm_highmem_is_dirtyable,
1352 .maxlen = sizeof(vm_highmem_is_dirtyable),
1353 .mode = 0644,
1354 .proc_handler = &proc_dointvec_minmax,
1355 .strategy = &sysctl_intvec,
1356 .extra1 = &zero,
1357 .extra2 = &one,
1358 },
1359#endif
4be6f6bb
PZ		 1360 {
1361 .ctl_name = CTL_UNNUMBERED,
1362 .procname = "scan_unevictable_pages",
1363 .data = &scan_unevictable_pages,
1364 .maxlen = sizeof(scan_unevictable_pages),
1365 .mode = 0644,
1366 .proc_handler = &scan_unevictable_handler,
1367 },
2be7fe07
AM		 1368/*
1369 * NOTE: do not add new entries to this table unless you have read
1370 * Documentation/sysctl/ctl_unnumbered.txt
1371 */
1da177e4
LT		 1372 { .ctl_name = 0 }
1373};
1374
2abc26fc 1375#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1376static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1377 { .ctl_name = 0 }
1378};
1379#endif
1380
d8217f07 1381static struct ctl_table fs_table[] = {
1da177e4
LT		 1382 {
1383 .ctl_name = FS_NRINODE,
1384 .procname = "inode-nr",
1385 .data = &inodes_stat,
1386 .maxlen = 2*sizeof(int),
1387 .mode = 0444,
1388 .proc_handler = &proc_dointvec,
1389 },
1390 {
1391 .ctl_name = FS_STATINODE,
1392 .procname = "inode-state",
1393 .data = &inodes_stat,
1394 .maxlen = 7*sizeof(int),
1395 .mode = 0444,
1396 .proc_handler = &proc_dointvec,
1397 },
1398 {
1da177e4
LT		 1399 .procname = "file-nr",
1400 .data = &files_stat,
1401 .maxlen = 3*sizeof(int),
1402 .mode = 0444,
529bf6be 1403 .proc_handler = &proc_nr_files,
1da177e4
LT		 1404 },
1405 {
1406 .ctl_name = FS_MAXFILE,
1407 .procname = "file-max",
1408 .data = &files_stat.max_files,
1409 .maxlen = sizeof(int),
1410 .mode = 0644,
1411 .proc_handler = &proc_dointvec,
1412 },
9cfe015a
ED		 1413 {
1414 .ctl_name = CTL_UNNUMBERED,
1415 .procname = "nr_open",
1416 .data = &sysctl_nr_open,
1417 .maxlen = sizeof(int),
1418 .mode = 0644,
eceea0b3
AV		 1419 .proc_handler = &proc_dointvec_minmax,
1420 .extra1 = &sysctl_nr_open_min,
1421 .extra2 = &sysctl_nr_open_max,
9cfe015a 1422 },
1da177e4
LT		 1423 {
1424 .ctl_name = FS_DENTRY,
1425 .procname = "dentry-state",
1426 .data = &dentry_stat,
1427 .maxlen = 6*sizeof(int),
1428 .mode = 0444,
1429 .proc_handler = &proc_dointvec,
1430 },
1431 {
1432 .ctl_name = FS_OVERFLOWUID,
1433 .procname = "overflowuid",
1434 .data = &fs_overflowuid,
1435 .maxlen = sizeof(int),
1436 .mode = 0644,
1437 .proc_handler = &proc_dointvec_minmax,
1438 .strategy = &sysctl_intvec,
1439 .extra1 = &minolduid,
1440 .extra2 = &maxolduid,
1441 },
1442 {
1443 .ctl_name = FS_OVERFLOWGID,
1444 .procname = "overflowgid",
1445 .data = &fs_overflowgid,
1446 .maxlen = sizeof(int),
1447 .mode = 0644,
1448 .proc_handler = &proc_dointvec_minmax,
1449 .strategy = &sysctl_intvec,
1450 .extra1 = &minolduid,
1451 .extra2 = &maxolduid,
1452 },
bfcd17a6 1453#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1454 {
1455 .ctl_name = FS_LEASES,
1456 .procname = "leases-enable",
1457 .data = &leases_enable,
1458 .maxlen = sizeof(int),
1459 .mode = 0644,
1460 .proc_handler = &proc_dointvec,
1461 },
bfcd17a6 1462#endif
1da177e4
LT		 1463#ifdef CONFIG_DNOTIFY
1464 {
1465 .ctl_name = FS_DIR_NOTIFY,
1466 .procname = "dir-notify-enable",
1467 .data = &dir_notify_enable,
1468 .maxlen = sizeof(int),
1469 .mode = 0644,
1470 .proc_handler = &proc_dointvec,
1471 },
1472#endif
1473#ifdef CONFIG_MMU
bfcd17a6 1474#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1475 {
1476 .ctl_name = FS_LEASE_TIME,
1477 .procname = "lease-break-time",
1478 .data = &lease_break_time,
1479 .maxlen = sizeof(int),
1480 .mode = 0644,
8e654fba 1481 .proc_handler = &proc_dointvec,
1da177e4 1482 },
bfcd17a6 1483#endif
ebf3f09c 1484#ifdef CONFIG_AIO
1da177e4 1485 {
1da177e4
LT		 1486 .procname = "aio-nr",
1487 .data = &aio_nr,
1488 .maxlen = sizeof(aio_nr),
1489 .mode = 0444,
d55b5fda 1490 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1491 },
1492 {
1da177e4
LT		 1493 .procname = "aio-max-nr",
1494 .data = &aio_max_nr,
1495 .maxlen = sizeof(aio_max_nr),
1496 .mode = 0644,
d55b5fda 1497 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1498 },
ebf3f09c 1499#endif /* CONFIG_AIO */
2d9048e2 1500#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1501 {
1502 .ctl_name = FS_INOTIFY,
1503 .procname = "inotify",
1504 .mode = 0555,
1505 .child = inotify_table,
1506 },
1507#endif
7ef9964e
DL		 1508#ifdef CONFIG_EPOLL
1509 {
1510 .procname = "epoll",
1511 .mode = 0555,
1512 .child = epoll_table,
1513 },
1514#endif
1da177e4 1515#endif
d6e71144
AC		 1516 {
1517 .ctl_name = KERN_SETUID_DUMPABLE,
1518 .procname = "suid_dumpable",
1519 .data = &suid_dumpable,
1520 .maxlen = sizeof(int),
1521 .mode = 0644,
8e654fba
MW		 1522 .proc_handler = &proc_dointvec_minmax,
1523 .strategy = &sysctl_intvec,
1524 .extra1 = &zero,
1525 .extra2 = &two,
d6e71144 1526 },
2abc26fc
EB		 1527#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1528 {
1529 .ctl_name = CTL_UNNUMBERED,
1530 .procname = "binfmt_misc",
1531 .mode = 0555,
1532 .child = binfmt_misc_table,
1533 },
1534#endif
2be7fe07
AM		 1535/*
1536 * NOTE: do not add new entries to this table unless you have read
1537 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1538 */
1da177e4
LT		 1539 { .ctl_name = 0 }
1540};
1541
d8217f07 1542static struct ctl_table debug_table[] = {
d0c3d534 1543#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1544 {
1545 .ctl_name = CTL_UNNUMBERED,
1546 .procname = "exception-trace",
1547 .data = &show_unhandled_signals,
1548 .maxlen = sizeof(int),
1549 .mode = 0644,
1550 .proc_handler = proc_dointvec
1551 },
1552#endif
1da177e4
LT		 1553 { .ctl_name = 0 }
1554};
1555
d8217f07 1556static struct ctl_table dev_table[] = {
1da177e4 1557 { .ctl_name = 0 }
0eeca283 1558};
1da177e4 1559
330d57fb
AV		 1560static DEFINE_SPINLOCK(sysctl_lock);
1561
1562/* called under sysctl_lock */
1563static int use_table(struct ctl_table_header *p)
1564{
1565 if (unlikely(p->unregistering))
1566 return 0;
1567 p->used++;
1568 return 1;
1569}
1570
1571/* called under sysctl_lock */
1572static void unuse_table(struct ctl_table_header *p)
1573{
1574 if (!--p->used)
1575 if (unlikely(p->unregistering))
1576 complete(p->unregistering);
1577}
1578
1579/* called under sysctl_lock, will reacquire if has to wait */
1580static void start_unregistering(struct ctl_table_header *p)
1581{
1582 /*
1583 * if p->used is 0, nobody will ever touch that entry again;
1584 * we'll eliminate all paths to it before dropping sysctl_lock
1585 */
1586 if (unlikely(p->used)) {
1587 struct completion wait;
1588 init_completion(&wait);
1589 p->unregistering = &wait;
1590 spin_unlock(&sysctl_lock);
1591 wait_for_completion(&wait);
1592 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1593 } else {
1594 /* anything non-NULL; we'll never dereference it */
1595 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1596 }
1597 /*
1598 * do not remove from the list until nobody holds it; walking the
1599 * list in do_sysctl() relies on that.
1600 */
1601 list_del_init(&p->ctl_entry);
1602}
1603
f7e6ced4
AV		 1604void sysctl_head_get(struct ctl_table_header *head)
1605{
1606 spin_lock(&sysctl_lock);
1607 head->count++;
1608 spin_unlock(&sysctl_lock);
1609}
1610
1611void sysctl_head_put(struct ctl_table_header *head)
1612{
1613 spin_lock(&sysctl_lock);
1614 if (!--head->count)
1615 kfree(head);
1616 spin_unlock(&sysctl_lock);
1617}
1618
1619struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1620{
1621 if (!head)
1622 BUG();
1623 spin_lock(&sysctl_lock);
1624 if (!use_table(head))
1625 head = ERR_PTR(-ENOENT);
1626 spin_unlock(&sysctl_lock);
1627 return head;
1628}
1629
805b5d5e
EB		 1630void sysctl_head_finish(struct ctl_table_header *head)
1631{
1632 if (!head)
1633 return;
1634 spin_lock(&sysctl_lock);
1635 unuse_table(head);
1636 spin_unlock(&sysctl_lock);
1637}
1638
73455092
AV		 1639static struct ctl_table_set *
1640lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1641{
1642 struct ctl_table_set *set = &root->default_set;
1643 if (root->lookup)
1644 set = root->lookup(root, namespaces);
1645 return set;
1646}
1647
e51b6ba0
EB		 1648static struct list_head *
1649lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1650{
73455092
AV		 1651 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1652 return &set->list;
e51b6ba0
EB		 1653}
1654
1655struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1656 struct ctl_table_header *prev)
1657{
1658 struct ctl_table_root *root;
1659 struct list_head *header_list;
805b5d5e
EB		 1660 struct ctl_table_header *head;
1661 struct list_head *tmp;
e51b6ba0 1662
805b5d5e
EB		 1663 spin_lock(&sysctl_lock);
1664 if (prev) {
e51b6ba0 1665 head = prev;
805b5d5e
EB		 1666 tmp = &prev->ctl_entry;
1667 unuse_table(prev);
1668 goto next;
1669 }
1670 tmp = &root_table_header.ctl_entry;
1671 for (;;) {
1672 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1673
1674 if (!use_table(head))
1675 goto next;
1676 spin_unlock(&sysctl_lock);
1677 return head;
1678 next:
e51b6ba0 1679 root = head->root;
805b5d5e 1680 tmp = tmp->next;
e51b6ba0
EB		 1681 header_list = lookup_header_list(root, namespaces);
1682 if (tmp != header_list)
1683 continue;
1684
1685 do {
1686 root = list_entry(root->root_list.next,
1687 struct ctl_table_root, root_list);
1688 if (root == &sysctl_table_root)
1689 goto out;
1690 header_list = lookup_header_list(root, namespaces);
1691 } while (list_empty(header_list));
1692 tmp = header_list->next;
805b5d5e 1693 }
e51b6ba0 1694out:
805b5d5e
EB		 1695 spin_unlock(&sysctl_lock);
1696 return NULL;
1697}
1698
e51b6ba0
EB		 1699struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1700{
1701 return __sysctl_head_next(current->nsproxy, prev);
1702}
1703
1704void register_sysctl_root(struct ctl_table_root *root)
1705{
1706 spin_lock(&sysctl_lock);
1707 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1708 spin_unlock(&sysctl_lock);
1709}
1710
b89a8171 1711#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1712/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1713static int do_sysctl_strategy(struct ctl_table_root *root,
1714 struct ctl_table *table,
2c4c7155
PE		 1715 void __user *oldval, size_t __user *oldlenp,
1716 void __user *newval, size_t newlen)
1717{
1718 int op = 0, rc;
1719
1720 if (oldval)
e6305c43 1721 op |= MAY_READ;
2c4c7155 1722 if (newval)
e6305c43 1723 op |= MAY_WRITE;
d7321cd6 1724 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1725 return -EPERM;
1726
1727 if (table->strategy) {
f221e726 1728 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1729 if (rc < 0)
1730 return rc;
1731 if (rc > 0)
1732 return 0;
1733 }
1734
1735 /* If there is no strategy routine, or if the strategy returns
1736 * zero, proceed with automatic r/w */
1737 if (table->data && table->maxlen) {
f221e726 1738 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1739 if (rc < 0)
1740 return rc;
1741 }
1742 return 0;
1743}
1744
1745static int parse_table(int __user *name, int nlen,
1746 void __user *oldval, size_t __user *oldlenp,
1747 void __user *newval, size_t newlen,
d7321cd6 1748 struct ctl_table_root *root,
2c4c7155
PE		 1749 struct ctl_table *table)
1750{
1751 int n;
1752repeat:
1753 if (!nlen)
1754 return -ENOTDIR;
1755 if (get_user(n, name))
1756 return -EFAULT;
1757 for ( ; table->ctl_name || table->procname; table++) {
1758 if (!table->ctl_name)
1759 continue;
1760 if (n == table->ctl_name) {
1761 int error;
1762 if (table->child) {
e6305c43 1763 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1764 return -EPERM;
1765 name++;
1766 nlen--;
1767 table = table->child;
1768 goto repeat;
1769 }
f221e726 1770 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1771 oldval, oldlenp,
1772 newval, newlen);
1773 return error;
1774 }
1775 }
1776 return -ENOTDIR;
1777}
1778
1da177e4
LT		 1779int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1780 void __user *newval, size_t newlen)
1781{
805b5d5e 1782 struct ctl_table_header *head;
330d57fb 1783 int error = -ENOTDIR;
1da177e4
LT		 1784
1785 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1786 return -ENOTDIR;
1787 if (oldval) {
1788 int old_len;
1789 if (!oldlenp || get_user(old_len, oldlenp))
1790 return -EFAULT;
1791 }
330d57fb 1792
805b5d5e
EB		 1793 for (head = sysctl_head_next(NULL); head;
1794 head = sysctl_head_next(head)) {
330d57fb 1795 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1796 newval, newlen,
1797 head->root, head->ctl_table);
805b5d5e
EB		 1798 if (error != -ENOTDIR) {
1799 sysctl_head_finish(head);
330d57fb 1800 break;
805b5d5e
EB		 1801 }
1802 }
330d57fb 1803 return error;
1da177e4
LT		 1804}
1805
1e7bfb21 1806SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1807{
1808 struct __sysctl_args tmp;
1809 int error;
1810
1811 if (copy_from_user(&tmp, args, sizeof(tmp)))
1812 return -EFAULT;
1813
7058cb02
EB		 1814 error = deprecated_sysctl_warning(&tmp);
1815 if (error)
1816 goto out;
1817
1da177e4
LT		 1818 lock_kernel();
1819 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1820 tmp.newval, tmp.newlen);
1821 unlock_kernel();
7058cb02 1822out:
1da177e4
LT		 1823 return error;
1824}
b89a8171 1825#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1826
1827/*
1ff007eb 1828 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1829 * some sysctl variables are readonly even to root.
1830 */
1831
1832static int test_perm(int mode, int op)
1833{
76aac0e9 1834 if (!current_euid())
1da177e4
LT		 1835 mode >>= 6;
1836 else if (in_egroup_p(0))
1837 mode >>= 3;
e6305c43 1838 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1839 return 0;
1840 return -EACCES;
1841}
1842
d7321cd6 1843int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1844{
1845 int error;
d7321cd6
PE		 1846 int mode;
1847
e6305c43 1848 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1849 if (error)
1850 return error;
d7321cd6
PE		 1851
1852 if (root->permissions)
1853 mode = root->permissions(root, current->nsproxy, table);
1854 else
1855 mode = table->mode;
1856
1857 return test_perm(mode, op);
1da177e4
LT		 1858}
1859
d912b0cc
EB		 1860static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1861{
1862 for (; table->ctl_name || table->procname; table++) {
1863 table->parent = parent;
1864 if (table->child)
1865 sysctl_set_parent(table, table->child);
1866 }
1867}
1868
1869static __init int sysctl_init(void)
1870{
1871 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1872#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1873 {
1874 int err;
1875 err = sysctl_check_table(current->nsproxy, root_table);
1876 }
1877#endif
d912b0cc
EB		 1878 return 0;
1879}
1880
1881core_initcall(sysctl_init);
1882
bfbcf034
AV		 1883static struct ctl_table *is_branch_in(struct ctl_table *branch,
1884 struct ctl_table *table)
ae7edecc
AV		 1885{
1886 struct ctl_table *p;
1887 const char *s = branch->procname;
1888
1889 /* branch should have named subdirectory as its first element */
1890 if (!s || !branch->child)
bfbcf034 1891 return NULL;
ae7edecc
AV		 1892
1893 /* ... and nothing else */
1894 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1895 return NULL;
ae7edecc
AV		 1896
1897 /* table should contain subdirectory with the same name */
1898 for (p = table; p->procname || p->ctl_name; p++) {
1899 if (!p->child)
1900 continue;
1901 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1902 return p;
ae7edecc 1903 }
bfbcf034 1904 return NULL;
ae7edecc
AV		 1905}
1906
1907/* see if attaching q to p would be an improvement */
1908static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1909{
1910 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1911 struct ctl_table *next;
ae7edecc
AV		 1912 int is_better = 0;
1913 int not_in_parent = !p->attached_by;
1914
bfbcf034 1915 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1916 if (by == q->attached_by)
1917 is_better = 1;
1918 if (to == p->attached_by)
1919 not_in_parent = 1;
1920 by = by->child;
bfbcf034 1921 to = next->child;
ae7edecc
AV		 1922 }
1923
1924 if (is_better && not_in_parent) {
1925 q->attached_by = by;
1926 q->attached_to = to;
1927 q->parent = p;
1928 }
1929}
1930
1da177e4 1931/**
e51b6ba0
EB		 1932 * __register_sysctl_paths - register a sysctl hierarchy
1933 * @root: List of sysctl headers to register on
1934 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1935 * @path: The path to the directory the sysctl table is in.
1da177e4 1936 * @table: the top-level table structure
1da177e4
LT		 1937 *
1938 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1939 * array. A completely 0 filled entry terminates the table.
1da177e4 1940 *
d8217f07 1941 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1942 *
1943 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1944 * must be unique within that level of sysctl
1945 *
1946 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1947 * enter a sysctl file
1948 *
1949 * data - a pointer to data for use by proc_handler
1950 *
1951 * maxlen - the maximum size in bytes of the data
1952 *
1953 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1954 *
1955 * child - a pointer to the child sysctl table if this entry is a directory, or
1956 * %NULL.
1957 *
1958 * proc_handler - the text handler routine (described below)
1959 *
1960 * strategy - the strategy routine (described below)
1961 *
1962 * de - for internal use by the sysctl routines
1963 *
1964 * extra1, extra2 - extra pointers usable by the proc handler routines
1965 *
1966 * Leaf nodes in the sysctl tree will be represented by a single file
1967 * under /proc; non-leaf nodes will be represented by directories.
1968 *
1969 * sysctl(2) can automatically manage read and write requests through
1970 * the sysctl table. The data and maxlen fields of the ctl_table
1971 * struct enable minimal validation of the values being written to be
1972 * performed, and the mode field allows minimal authentication.
1973 *
1974 * More sophisticated management can be enabled by the provision of a
1975 * strategy routine with the table entry. This will be called before
1976 * any automatic read or write of the data is performed.
1977 *
1978 * The strategy routine may return
1979 *
1980 * < 0 - Error occurred (error is passed to user process)
1981 *
1982 * 0 - OK - proceed with automatic read or write.
1983 *
1984 * > 0 - OK - read or write has been done by the strategy routine, so
1985 * return immediately.
1986 *
1987 * There must be a proc_handler routine for any terminal nodes
1988 * mirrored under /proc/sys (non-terminals are handled by a built-in
1989 * directory handler). Several default handlers are available to
1990 * cover common cases -
1991 *
1992 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1993 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1994 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1995 *
1996 * It is the handler's job to read the input buffer from user memory
1997 * and process it. The handler should return 0 on success.
1998 *
1999 * This routine returns %NULL on a failure to register, and a pointer
2000 * to the table header on success.
2001 */
e51b6ba0
EB		 2002struct ctl_table_header *__register_sysctl_paths(
2003 struct ctl_table_root *root,
2004 struct nsproxy *namespaces,
2005 const struct ctl_path *path, struct ctl_table *table)
1da177e4 2006{
29e796fd
EB		 2007 struct ctl_table_header *header;
2008 struct ctl_table *new, **prevp;
2009 unsigned int n, npath;
ae7edecc 2010 struct ctl_table_set *set;
29e796fd
EB		 2011
2012 /* Count the path components */
2013 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2014 ;
2015
2016 /*
2017 * For each path component, allocate a 2-element ctl_table array.
2018 * The first array element will be filled with the sysctl entry
2019 * for this, the second will be the sentinel (ctl_name == 0).
2020 *
2021 * We allocate everything in one go so that we don't have to
2022 * worry about freeing additional memory in unregister_sysctl_table.
2023 */
2024 header = kzalloc(sizeof(struct ctl_table_header) +
2025 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2026 if (!header)
1da177e4 2027 return NULL;
29e796fd
EB		 2028
2029 new = (struct ctl_table *) (header + 1);
2030
2031 /* Now connect the dots */
2032 prevp = &header->ctl_table;
2033 for (n = 0; n < npath; ++n, ++path) {
2034 /* Copy the procname */
2035 new->procname = path->procname;
2036 new->ctl_name = path->ctl_name;
2037 new->mode = 0555;
2038
2039 *prevp = new;
2040 prevp = &new->child;
2041
2042 new += 2;
2043 }
2044 *prevp = table;
23eb06de 2045 header->ctl_table_arg = table;
29e796fd
EB		 2046
2047 INIT_LIST_HEAD(&header->ctl_entry);
2048 header->used = 0;
2049 header->unregistering = NULL;
e51b6ba0 2050 header->root = root;
29e796fd 2051 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 2052 header->count = 1;
88f458e4 2053#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 2054 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 2055 kfree(header);
fc6cd25b
EB		 2056 return NULL;
2057 }
88f458e4 2058#endif
330d57fb 2059 spin_lock(&sysctl_lock);
73455092 2060 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 2061 header->attached_by = header->ctl_table;
2062 header->attached_to = root_table;
2063 header->parent = &root_table_header;
2064 for (set = header->set; set; set = set->parent) {
2065 struct ctl_table_header *p;
2066 list_for_each_entry(p, &set->list, ctl_entry) {
2067 if (p->unregistering)
2068 continue;
2069 try_attach(p, header);
2070 }
2071 }
2072 header->parent->count++;
73455092 2073 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 2074 spin_unlock(&sysctl_lock);
29e796fd
EB		 2075
2076 return header;
2077}
2078
e51b6ba0
EB		 2079/**
2080 * register_sysctl_table_path - register a sysctl table hierarchy
2081 * @path: The path to the directory the sysctl table is in.
2082 * @table: the top-level table structure
2083 *
2084 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2085 * array. A completely 0 filled entry terminates the table.
2086 *
2087 * See __register_sysctl_paths for more details.
2088 */
2089struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2090 struct ctl_table *table)
2091{
2092 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2093 path, table);
2094}
2095
29e796fd
EB		 2096/**
2097 * register_sysctl_table - register a sysctl table hierarchy
2098 * @table: the top-level table structure
2099 *
2100 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2101 * array. A completely 0 filled entry terminates the table.
2102 *
2103 * See register_sysctl_paths for more details.
2104 */
2105struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2106{
2107 static const struct ctl_path null_path[] = { {} };
2108
2109 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2110}
2111
2112/**
2113 * unregister_sysctl_table - unregister a sysctl table hierarchy
2114 * @header: the header returned from register_sysctl_table
2115 *
2116 * Unregisters the sysctl table and all children. proc entries may not
2117 * actually be removed until they are no longer used by anyone.
2118 */
2119void unregister_sysctl_table(struct ctl_table_header * header)
2120{
330d57fb 2121 might_sleep();
f1dad166
PE		 2122
2123 if (header == NULL)
2124 return;
2125
330d57fb
AV		 2126 spin_lock(&sysctl_lock);
2127 start_unregistering(header);
ae7edecc
AV		 2128 if (!--header->parent->count) {
2129 WARN_ON(1);
2130 kfree(header->parent);
2131 }
f7e6ced4
AV		 2132 if (!--header->count)
2133 kfree(header);
330d57fb 2134 spin_unlock(&sysctl_lock);
1da177e4
LT		 2135}
2136
9043476f
AV		 2137int sysctl_is_seen(struct ctl_table_header *p)
2138{
2139 struct ctl_table_set *set = p->set;
2140 int res;
2141 spin_lock(&sysctl_lock);
2142 if (p->unregistering)
2143 res = 0;
2144 else if (!set->is_seen)
2145 res = 1;
2146 else
2147 res = set->is_seen(set);
2148 spin_unlock(&sysctl_lock);
2149 return res;
2150}
2151
73455092
AV		 2152void setup_sysctl_set(struct ctl_table_set *p,
2153 struct ctl_table_set *parent,
2154 int (*is_seen)(struct ctl_table_set *))
2155{
2156 INIT_LIST_HEAD(&p->list);
2157 p->parent = parent ? parent : &sysctl_table_root.default_set;
2158 p->is_seen = is_seen;
2159}
2160
b89a8171 2161#else /* !CONFIG_SYSCTL */
d8217f07 2162struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2163{
2164 return NULL;
2165}
2166
29e796fd
EB		 2167struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2168 struct ctl_table *table)
2169{
2170 return NULL;
2171}
2172
b89a8171
EB		 2173void unregister_sysctl_table(struct ctl_table_header * table)
2174{
2175}
2176
73455092
AV		 2177void setup_sysctl_set(struct ctl_table_set *p,
2178 struct ctl_table_set *parent,
2179 int (*is_seen)(struct ctl_table_set *))
2180{
2181}
2182
f7e6ced4
AV		 2183void sysctl_head_put(struct ctl_table_header *head)
2184{
2185}
2186
b89a8171
EB		 2187#endif /* CONFIG_SYSCTL */
2188
1da177e4
LT		 2189/*
2190 * /proc/sys support
2191 */
2192
b89a8171 2193#ifdef CONFIG_PROC_SYSCTL
1da177e4 2194
b1ba4ddd
AB		 2195static int _proc_do_string(void* data, int maxlen, int write,
2196 struct file *filp, void __user *buffer,
2197 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2198{
2199 size_t len;
2200 char __user *p;
2201 char c;
8d060877
ON		 2202
2203 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2204 *lenp = 0;
2205 return 0;
2206 }
8d060877 2207
1da177e4
LT		 2208 if (write) {
2209 len = 0;
2210 p = buffer;
2211 while (len < *lenp) {
2212 if (get_user(c, p++))
2213 return -EFAULT;
2214 if (c == 0 || c == '\n')
2215 break;
2216 len++;
2217 }
f5dd3d6f
SV		 2218 if (len >= maxlen)
2219 len = maxlen-1;
2220 if(copy_from_user(data, buffer, len))
1da177e4 2221 return -EFAULT;
f5dd3d6f 2222 ((char *) data)[len] = 0;
1da177e4
LT		 2223 *ppos += *lenp;
2224 } else {
f5dd3d6f
SV		 2225 len = strlen(data);
2226 if (len > maxlen)
2227 len = maxlen;
8d060877
ON		 2228
2229 if (*ppos > len) {
2230 *lenp = 0;
2231 return 0;
2232 }
2233
2234 data += *ppos;
2235 len -= *ppos;
2236
1da177e4
LT		 2237 if (len > *lenp)
2238 len = *lenp;
2239 if (len)
f5dd3d6f 2240 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2241 return -EFAULT;
2242 if (len < *lenp) {
2243 if(put_user('\n', ((char __user *) buffer) + len))
2244 return -EFAULT;
2245 len++;
2246 }
2247 *lenp = len;
2248 *ppos += len;
2249 }
2250 return 0;
2251}
2252
f5dd3d6f
SV		 2253/**
2254 * proc_dostring - read a string sysctl
2255 * @table: the sysctl table
2256 * @write: %TRUE if this is a write to the sysctl file
2257 * @filp: the file structure
2258 * @buffer: the user buffer
2259 * @lenp: the size of the user buffer
2260 * @ppos: file position
2261 *
2262 * Reads/writes a string from/to the user buffer. If the kernel
2263 * buffer provided is not large enough to hold the string, the
2264 * string is truncated. The copied string is %NULL-terminated.
2265 * If the string is being read by the user process, it is copied
2266 * and a newline '\n' is added. It is truncated if the buffer is
2267 * not large enough.
2268 *
2269 * Returns 0 on success.
2270 */
d8217f07 2271int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2272 void __user *buffer, size_t *lenp, loff_t *ppos)
2273{
2274 return _proc_do_string(table->data, table->maxlen, write, filp,
2275 buffer, lenp, ppos);
2276}
2277
1da177e4
LT		 2278
2279static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2280 int *valp,
2281 int write, void *data)
2282{
2283 if (write) {
2284 *valp = *negp ? -*lvalp : *lvalp;
2285 } else {
2286 int val = *valp;
2287 if (val < 0) {
2288 *negp = -1;
2289 *lvalp = (unsigned long)-val;
2290 } else {
2291 *negp = 0;
2292 *lvalp = (unsigned long)val;
2293 }
2294 }
2295 return 0;
2296}
2297
d8217f07 2298static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2299 int write, struct file *filp, void __user *buffer,
2300 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2301 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2302 int write, void *data),
2303 void *data)
2304{
2305#define TMPBUFLEN 21
7338f299 2306 int *i, vleft, first = 1, neg;
1da177e4
LT		 2307 unsigned long lval;
2308 size_t left, len;
2309
2310 char buf[TMPBUFLEN], *p;
2311 char __user *s = buffer;
2312
fcfbd547 2313 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2314 (*ppos && !write)) {
2315 *lenp = 0;
2316 return 0;
2317 }
2318
fcfbd547 2319 i = (int *) tbl_data;
1da177e4
LT		 2320 vleft = table->maxlen / sizeof(*i);
2321 left = *lenp;
2322
2323 if (!conv)
2324 conv = do_proc_dointvec_conv;
2325
2326 for (; left && vleft--; i++, first=0) {
2327 if (write) {
2328 while (left) {
2329 char c;
2330 if (get_user(c, s))
2331 return -EFAULT;
2332 if (!isspace(c))
2333 break;
2334 left--;
2335 s++;
2336 }
2337 if (!left)
2338 break;
2339 neg = 0;
2340 len = left;
2341 if (len > sizeof(buf) - 1)
2342 len = sizeof(buf) - 1;
2343 if (copy_from_user(buf, s, len))
2344 return -EFAULT;
2345 buf[len] = 0;
2346 p = buf;
2347 if (*p == '-' && left > 1) {
2348 neg = 1;
bd9b0bac 2349 p++;
1da177e4
LT		 2350 }
2351 if (*p < '0' || *p > '9')
2352 break;
2353
2354 lval = simple_strtoul(p, &p, 0);
2355
2356 len = p-buf;
2357 if ((len < left) && *p && !isspace(*p))
2358 break;
1da177e4
LT		 2359 s += len;
2360 left -= len;
2361
2362 if (conv(&neg, &lval, i, 1, data))
2363 break;
2364 } else {
2365 p = buf;
2366 if (!first)
2367 *p++ = '\t';
2368
2369 if (conv(&neg, &lval, i, 0, data))
2370 break;
2371
2372 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2373 len = strlen(buf);
2374 if (len > left)
2375 len = left;
2376 if(copy_to_user(s, buf, len))
2377 return -EFAULT;
2378 left -= len;
2379 s += len;
2380 }
2381 }
2382
2383 if (!write && !first && left) {
2384 if(put_user('\n', s))
2385 return -EFAULT;
2386 left--, s++;
2387 }
2388 if (write) {
2389 while (left) {
2390 char c;
2391 if (get_user(c, s++))
2392 return -EFAULT;
2393 if (!isspace(c))
2394 break;
2395 left--;
2396 }
2397 }
2398 if (write && first)
2399 return -EINVAL;
2400 *lenp -= left;
2401 *ppos += *lenp;
2402 return 0;
2403#undef TMPBUFLEN
2404}
2405
d8217f07 2406static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2407 void __user *buffer, size_t *lenp, loff_t *ppos,
2408 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2409 int write, void *data),
2410 void *data)
2411{
2412 return __do_proc_dointvec(table->data, table, write, filp,
2413 buffer, lenp, ppos, conv, data);
2414}
2415
1da177e4
LT		 2416/**
2417 * proc_dointvec - read a vector of integers
2418 * @table: the sysctl table
2419 * @write: %TRUE if this is a write to the sysctl file
2420 * @filp: the file structure
2421 * @buffer: the user buffer
2422 * @lenp: the size of the user buffer
2423 * @ppos: file position
2424 *
2425 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2426 * values from/to the user buffer, treated as an ASCII string.
2427 *
2428 * Returns 0 on success.
2429 */
d8217f07 2430int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2431 void __user *buffer, size_t *lenp, loff_t *ppos)
2432{
2433 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2434 NULL,NULL);
2435}
2436
34f5a398 2437/*
25ddbb18
AK		 2438 * Taint values can only be increased
2439 * This means we can safely use a temporary.
34f5a398 2440 */
25ddbb18 2441static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2442 void __user *buffer, size_t *lenp, loff_t *ppos)
2443{
25ddbb18
AK		 2444 struct ctl_table t;
2445 unsigned long tmptaint = get_taint();
2446 int err;
34f5a398 2447
91fcd412 2448 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2449 return -EPERM;
2450
25ddbb18
AK		 2451 t = *table;
2452 t.data = &tmptaint;
2453 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2454 if (err < 0)
2455 return err;
2456
2457 if (write) {
2458 /*
2459 * Poor man's atomic or. Not worth adding a primitive
2460 * to everyone's atomic.h for this
2461 */
2462 int i;
2463 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2464 if ((tmptaint >> i) & 1)
2465 add_taint(i);
2466 }
2467 }
2468
2469 return err;
34f5a398
TT		 2470}
2471
1da177e4
LT		 2472struct do_proc_dointvec_minmax_conv_param {
2473 int *min;
2474 int *max;
2475};
2476
2477static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2478 int *valp,
2479 int write, void *data)
2480{
2481 struct do_proc_dointvec_minmax_conv_param *param = data;
2482 if (write) {
2483 int val = *negp ? -*lvalp : *lvalp;
2484 if ((param->min && *param->min > val) ||
2485 (param->max && *param->max < val))
2486 return -EINVAL;
2487 *valp = val;
2488 } else {
2489 int val = *valp;
2490 if (val < 0) {
2491 *negp = -1;
2492 *lvalp = (unsigned long)-val;
2493 } else {
2494 *negp = 0;
2495 *lvalp = (unsigned long)val;
2496 }
2497 }
2498 return 0;
2499}
2500
2501/**
2502 * proc_dointvec_minmax - read a vector of integers with min/max values
2503 * @table: the sysctl table
2504 * @write: %TRUE if this is a write to the sysctl file
2505 * @filp: the file structure
2506 * @buffer: the user buffer
2507 * @lenp: the size of the user buffer
2508 * @ppos: file position
2509 *
2510 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2511 * values from/to the user buffer, treated as an ASCII string.
2512 *
2513 * This routine will ensure the values are within the range specified by
2514 * table->extra1 (min) and table->extra2 (max).
2515 *
2516 * Returns 0 on success.
2517 */
d8217f07 2518int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2519 void __user *buffer, size_t *lenp, loff_t *ppos)
2520{
2521 struct do_proc_dointvec_minmax_conv_param param = {
2522 .min = (int *) table->extra1,
2523 .max = (int *) table->extra2,
2524 };
2525 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2526 do_proc_dointvec_minmax_conv, &param);
2527}
2528
d8217f07 2529static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2530 struct file *filp,
2531 void __user *buffer,
2532 size_t *lenp, loff_t *ppos,
2533 unsigned long convmul,
2534 unsigned long convdiv)
2535{
2536#define TMPBUFLEN 21
2537 unsigned long *i, *min, *max, val;
2538 int vleft, first=1, neg;
2539 size_t len, left;
2540 char buf[TMPBUFLEN], *p;
2541 char __user *s = buffer;
2542
fcfbd547 2543 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2544 (*ppos && !write)) {
2545 *lenp = 0;
2546 return 0;
2547 }
2548
fcfbd547 2549 i = (unsigned long *) data;
1da177e4
LT		 2550 min = (unsigned long *) table->extra1;
2551 max = (unsigned long *) table->extra2;
2552 vleft = table->maxlen / sizeof(unsigned long);
2553 left = *lenp;
2554
2555 for (; left && vleft--; i++, min++, max++, first=0) {
2556 if (write) {
2557 while (left) {
2558 char c;
2559 if (get_user(c, s))
2560 return -EFAULT;
2561 if (!isspace(c))
2562 break;
2563 left--;
2564 s++;
2565 }
2566 if (!left)
2567 break;
2568 neg = 0;
2569 len = left;
2570 if (len > TMPBUFLEN-1)
2571 len = TMPBUFLEN-1;
2572 if (copy_from_user(buf, s, len))
2573 return -EFAULT;
2574 buf[len] = 0;
2575 p = buf;
2576 if (*p == '-' && left > 1) {
2577 neg = 1;
bd9b0bac 2578 p++;
1da177e4
LT		 2579 }
2580 if (*p < '0' || *p > '9')
2581 break;
2582 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2583 len = p-buf;
2584 if ((len < left) && *p && !isspace(*p))
2585 break;
2586 if (neg)
2587 val = -val;
2588 s += len;
2589 left -= len;
2590
2591 if(neg)
2592 continue;
2593 if ((min && val < *min) || (max && val > *max))
2594 continue;
2595 *i = val;
2596 } else {
2597 p = buf;
2598 if (!first)
2599 *p++ = '\t';
2600 sprintf(p, "%lu", convdiv * (*i) / convmul);
2601 len = strlen(buf);
2602 if (len > left)
2603 len = left;
2604 if(copy_to_user(s, buf, len))
2605 return -EFAULT;
2606 left -= len;
2607 s += len;
2608 }
2609 }
2610
2611 if (!write && !first && left) {
2612 if(put_user('\n', s))
2613 return -EFAULT;
2614 left--, s++;
2615 }
2616 if (write) {
2617 while (left) {
2618 char c;
2619 if (get_user(c, s++))
2620 return -EFAULT;
2621 if (!isspace(c))
2622 break;
2623 left--;
2624 }
2625 }
2626 if (write && first)
2627 return -EINVAL;
2628 *lenp -= left;
2629 *ppos += *lenp;
2630 return 0;
2631#undef TMPBUFLEN
2632}
2633
d8217f07 2634static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2635 struct file *filp,
2636 void __user *buffer,
2637 size_t *lenp, loff_t *ppos,
2638 unsigned long convmul,
2639 unsigned long convdiv)
2640{
2641 return __do_proc_doulongvec_minmax(table->data, table, write,
2642 filp, buffer, lenp, ppos, convmul, convdiv);
2643}
2644
1da177e4
LT		 2645/**
2646 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2647 * @table: the sysctl table
2648 * @write: %TRUE if this is a write to the sysctl file
2649 * @filp: the file structure
2650 * @buffer: the user buffer
2651 * @lenp: the size of the user buffer
2652 * @ppos: file position
2653 *
2654 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2655 * values from/to the user buffer, treated as an ASCII string.
2656 *
2657 * This routine will ensure the values are within the range specified by
2658 * table->extra1 (min) and table->extra2 (max).
2659 *
2660 * Returns 0 on success.
2661 */
d8217f07 2662int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2663 void __user *buffer, size_t *lenp, loff_t *ppos)
2664{
2665 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2666}
2667
2668/**
2669 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2670 * @table: the sysctl table
2671 * @write: %TRUE if this is a write to the sysctl file
2672 * @filp: the file structure
2673 * @buffer: the user buffer
2674 * @lenp: the size of the user buffer
2675 * @ppos: file position
2676 *
2677 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2678 * values from/to the user buffer, treated as an ASCII string. The values
2679 * are treated as milliseconds, and converted to jiffies when they are stored.
2680 *
2681 * This routine will ensure the values are within the range specified by
2682 * table->extra1 (min) and table->extra2 (max).
2683 *
2684 * Returns 0 on success.
2685 */
d8217f07 2686int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2687 struct file *filp,
2688 void __user *buffer,
2689 size_t *lenp, loff_t *ppos)
2690{
2691 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2692 lenp, ppos, HZ, 1000l);
2693}
2694
2695
2696static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2697 int *valp,
2698 int write, void *data)
2699{
2700 if (write) {
cba9f33d
BS		 2701 if (*lvalp > LONG_MAX / HZ)
2702 return 1;
1da177e4
LT		 2703 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2704 } else {
2705 int val = *valp;
2706 unsigned long lval;
2707 if (val < 0) {
2708 *negp = -1;
2709 lval = (unsigned long)-val;
2710 } else {
2711 *negp = 0;
2712 lval = (unsigned long)val;
2713 }
2714 *lvalp = lval / HZ;
2715 }
2716 return 0;
2717}
2718
2719static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2720 int *valp,
2721 int write, void *data)
2722{
2723 if (write) {
cba9f33d
BS		 2724 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2725 return 1;
1da177e4
LT		 2726 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2727 } else {
2728 int val = *valp;
2729 unsigned long lval;
2730 if (val < 0) {
2731 *negp = -1;
2732 lval = (unsigned long)-val;
2733 } else {
2734 *negp = 0;
2735 lval = (unsigned long)val;
2736 }
2737 *lvalp = jiffies_to_clock_t(lval);
2738 }
2739 return 0;
2740}
2741
2742static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2743 int *valp,
2744 int write, void *data)
2745{
2746 if (write) {
2747 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2748 } else {
2749 int val = *valp;
2750 unsigned long lval;
2751 if (val < 0) {
2752 *negp = -1;
2753 lval = (unsigned long)-val;
2754 } else {
2755 *negp = 0;
2756 lval = (unsigned long)val;
2757 }
2758 *lvalp = jiffies_to_msecs(lval);
2759 }
2760 return 0;
2761}
2762
2763/**
2764 * proc_dointvec_jiffies - read a vector of integers as seconds
2765 * @table: the sysctl table
2766 * @write: %TRUE if this is a write to the sysctl file
2767 * @filp: the file structure
2768 * @buffer: the user buffer
2769 * @lenp: the size of the user buffer
2770 * @ppos: file position
2771 *
2772 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2773 * values from/to the user buffer, treated as an ASCII string.
2774 * The values read are assumed to be in seconds, and are converted into
2775 * jiffies.
2776 *
2777 * Returns 0 on success.
2778 */
d8217f07 2779int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2780 void __user *buffer, size_t *lenp, loff_t *ppos)
2781{
2782 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2783 do_proc_dointvec_jiffies_conv,NULL);
2784}
2785
2786/**
2787 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2788 * @table: the sysctl table
2789 * @write: %TRUE if this is a write to the sysctl file
2790 * @filp: the file structure
2791 * @buffer: the user buffer
2792 * @lenp: the size of the user buffer
1e5d5331 2793 * @ppos: pointer to the file position
1da177e4
LT		 2794 *
2795 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2796 * values from/to the user buffer, treated as an ASCII string.
2797 * The values read are assumed to be in 1/USER_HZ seconds, and
2798 * are converted into jiffies.
2799 *
2800 * Returns 0 on success.
2801 */
d8217f07 2802int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2803 void __user *buffer, size_t *lenp, loff_t *ppos)
2804{
2805 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2806 do_proc_dointvec_userhz_jiffies_conv,NULL);
2807}
2808
2809/**
2810 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2811 * @table: the sysctl table
2812 * @write: %TRUE if this is a write to the sysctl file
2813 * @filp: the file structure
2814 * @buffer: the user buffer
2815 * @lenp: the size of the user buffer
67be2dd1
MW		 2816 * @ppos: file position
2817 * @ppos: the current position in the file
1da177e4
LT		 2818 *
2819 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2820 * values from/to the user buffer, treated as an ASCII string.
2821 * The values read are assumed to be in 1/1000 seconds, and
2822 * are converted into jiffies.
2823 *
2824 * Returns 0 on success.
2825 */
d8217f07 2826int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2827 void __user *buffer, size_t *lenp, loff_t *ppos)
2828{
2829 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2830 do_proc_dointvec_ms_jiffies_conv, NULL);
2831}
2832
d8217f07 2833static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2834 void __user *buffer, size_t *lenp, loff_t *ppos)
2835{
2836 struct pid *new_pid;
2837 pid_t tmp;
2838 int r;
2839
6c5f3e7b 2840 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2841
2842 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2843 lenp, ppos, NULL, NULL);
2844 if (r || !write)
2845 return r;
2846
2847 new_pid = find_get_pid(tmp);
2848 if (!new_pid)
2849 return -ESRCH;
2850
2851 put_pid(xchg(&cad_pid, new_pid));
2852 return 0;
2853}
2854
1da177e4
LT		 2855#else /* CONFIG_PROC_FS */
2856
d8217f07 2857int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2858 void __user *buffer, size_t *lenp, loff_t *ppos)
2859{
2860 return -ENOSYS;
2861}
2862
d8217f07 2863int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2864 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2865{
2866 return -ENOSYS;
2867}
2868
d8217f07 2869int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2870 void __user *buffer, size_t *lenp, loff_t *ppos)
2871{
2872 return -ENOSYS;
2873}
2874
d8217f07 2875int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2876 void __user *buffer, size_t *lenp, loff_t *ppos)
2877{
2878 return -ENOSYS;
2879}
2880
d8217f07 2881int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2882 void __user *buffer, size_t *lenp, loff_t *ppos)
2883{
2884 return -ENOSYS;
2885}
2886
d8217f07 2887int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2888 void __user *buffer, size_t *lenp, loff_t *ppos)
2889{
2890 return -ENOSYS;
2891}
2892
d8217f07 2893int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2894 void __user *buffer, size_t *lenp, loff_t *ppos)
2895{
2896 return -ENOSYS;
2897}
2898
d8217f07 2899int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2900 struct file *filp,
2901 void __user *buffer,
2902 size_t *lenp, loff_t *ppos)
2903{
2904 return -ENOSYS;
2905}
2906
2907
2908#endif /* CONFIG_PROC_FS */
2909
2910
b89a8171 2911#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2912/*
2913 * General sysctl support routines
2914 */
2915
49a0c458 2916/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2917int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2918 void __user *oldval, size_t __user *oldlenp,
2919 void __user *newval, size_t newlen)
2920{
2921 size_t len;
2922
2923 /* Get out of I don't have a variable */
2924 if (!table->data || !table->maxlen)
2925 return -ENOTDIR;
2926
2927 if (oldval && oldlenp) {
2928 if (get_user(len, oldlenp))
2929 return -EFAULT;
2930 if (len) {
2931 if (len > table->maxlen)
2932 len = table->maxlen;
2933 if (copy_to_user(oldval, table->data, len))
2934 return -EFAULT;
2935 if (put_user(len, oldlenp))
2936 return -EFAULT;
2937 }
2938 }
2939
2940 if (newval && newlen) {
2941 if (newlen > table->maxlen)
2942 newlen = table->maxlen;
2943
2944 if (copy_from_user(table->data, newval, newlen))
2945 return -EFAULT;
2946 }
2947 return 1;
2948}
2949
1da177e4 2950/* The generic string strategy routine: */
f221e726 2951int sysctl_string(struct ctl_table *table,
1da177e4 2952 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2953 void __user *newval, size_t newlen)
1da177e4 2954{
1da177e4
LT		 2955 if (!table->data || !table->maxlen)
2956 return -ENOTDIR;
2957
2958 if (oldval && oldlenp) {
de9e007d
LT		 2959 size_t bufsize;
2960 if (get_user(bufsize, oldlenp))
1da177e4 2961 return -EFAULT;
de9e007d
LT		 2962 if (bufsize) {
2963 size_t len = strlen(table->data), copied;
2964
2965 /* This shouldn't trigger for a well-formed sysctl */
2966 if (len > table->maxlen)
1da177e4 2967 len = table->maxlen;
de9e007d
LT		 2968
2969 /* Copy up to a max of bufsize-1 bytes of the string */
2970 copied = (len >= bufsize) ? bufsize - 1 : len;
2971
2972 if (copy_to_user(oldval, table->data, copied) ||
2973 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2974 return -EFAULT;
de9e007d 2975 if (put_user(len, oldlenp))
1da177e4
LT		 2976 return -EFAULT;
2977 }
2978 }
2979 if (newval && newlen) {
de9e007d 2980 size_t len = newlen;
1da177e4
LT		 2981 if (len > table->maxlen)
2982 len = table->maxlen;
2983 if(copy_from_user(table->data, newval, len))
2984 return -EFAULT;
2985 if (len == table->maxlen)
2986 len--;
2987 ((char *) table->data)[len] = 0;
2988 }
82c9df82 2989 return 1;
1da177e4
LT		 2990}
2991
2992/*
2993 * This function makes sure that all of the integers in the vector
2994 * are between the minimum and maximum values given in the arrays
2995 * table->extra1 and table->extra2, respectively.
2996 */
f221e726 2997int sysctl_intvec(struct ctl_table *table,
1da177e4 2998 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2999 void __user *newval, size_t newlen)
1da177e4
LT		 3000{
3001
3002 if (newval && newlen) {
3003 int __user *vec = (int __user *) newval;
3004 int *min = (int *) table->extra1;
3005 int *max = (int *) table->extra2;
3006 size_t length;
3007 int i;
3008
3009 if (newlen % sizeof(int) != 0)
3010 return -EINVAL;
3011
3012 if (!table->extra1 && !table->extra2)
3013 return 0;
3014
3015 if (newlen > table->maxlen)
3016 newlen = table->maxlen;
3017 length = newlen / sizeof(int);
3018
3019 for (i = 0; i < length; i++) {
3020 int value;
3021 if (get_user(value, vec + i))
3022 return -EFAULT;
3023 if (min && value < min[i])
3024 return -EINVAL;
3025 if (max && value > max[i])
3026 return -EINVAL;
3027 }
3028 }
3029 return 0;
3030}
3031
3032/* Strategy function to convert jiffies to seconds */
f221e726 3033int sysctl_jiffies(struct ctl_table *table,
1da177e4 3034 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3035 void __user *newval, size_t newlen)
1da177e4 3036{
3ee75ac3 3037 if (oldval && oldlenp) {
1da177e4 3038 size_t olen;
3ee75ac3
AD		 3039
3040 if (get_user(olen, oldlenp))
3041 return -EFAULT;
3042 if (olen) {
3043 int val;
3044
3045 if (olen < sizeof(int))
3046 return -EINVAL;
3047
3048 val = *(int *)(table->data) / HZ;
3049 if (put_user(val, (int __user *)oldval))
3050 return -EFAULT;
3051 if (put_user(sizeof(int), oldlenp))
1da177e4 3052 return -EFAULT;
1da177e4 3053 }
1da177e4
LT		 3054 }
3055 if (newval && newlen) {
3056 int new;
3057 if (newlen != sizeof(int))
3058 return -EINVAL;
3059 if (get_user(new, (int __user *)newval))
3060 return -EFAULT;
3061 *(int *)(table->data) = new*HZ;
3062 }
3063 return 1;
3064}
3065
3066/* Strategy function to convert jiffies to seconds */
f221e726 3067int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3068 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3069 void __user *newval, size_t newlen)
1da177e4 3070{
3ee75ac3 3071 if (oldval && oldlenp) {
1da177e4 3072 size_t olen;
3ee75ac3
AD		 3073
3074 if (get_user(olen, oldlenp))
3075 return -EFAULT;
3076 if (olen) {
3077 int val;
3078
3079 if (olen < sizeof(int))
3080 return -EINVAL;
3081
3082 val = jiffies_to_msecs(*(int *)(table->data));
3083 if (put_user(val, (int __user *)oldval))
3084 return -EFAULT;
3085 if (put_user(sizeof(int), oldlenp))
1da177e4 3086 return -EFAULT;
1da177e4 3087 }
1da177e4
LT		 3088 }
3089 if (newval && newlen) {
3090 int new;
3091 if (newlen != sizeof(int))
3092 return -EINVAL;
3093 if (get_user(new, (int __user *)newval))
3094 return -EFAULT;
3095 *(int *)(table->data) = msecs_to_jiffies(new);
3096 }
3097 return 1;
3098}
3099
c4b8b769 3100
c4b8b769 3101
b89a8171 3102#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3103
3104
1e7bfb21 3105SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3106{
0e009be8 3107 struct __sysctl_args tmp;
7058cb02 3108 int error;
0e009be8 3109
0e009be8
EB		 3110 if (copy_from_user(&tmp, args, sizeof(tmp)))
3111 return -EFAULT;
0e009be8 3112
7058cb02 3113 error = deprecated_sysctl_warning(&tmp);
b89a8171 3114
7058cb02
EB		 3115 /* If no error reading the parameters then just -ENOSYS ... */
3116 if (!error)
3117 error = -ENOSYS;
3118
3119 return error;
1da177e4
LT		 3120}
3121
f221e726 3122int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3123 void __user *oldval, size_t __user *oldlenp,
3124 void __user *newval, size_t newlen)
3125{
3126 return -ENOSYS;
3127}
3128
f221e726 3129int sysctl_string(struct ctl_table *table,
1da177e4 3130 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3131 void __user *newval, size_t newlen)
1da177e4
LT		 3132{
3133 return -ENOSYS;
3134}
3135
f221e726 3136int sysctl_intvec(struct ctl_table *table,
1da177e4 3137 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3138 void __user *newval, size_t newlen)
1da177e4
LT		 3139{
3140 return -ENOSYS;
3141}
3142
f221e726 3143int sysctl_jiffies(struct ctl_table *table,
1da177e4 3144 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3145 void __user *newval, size_t newlen)
1da177e4
LT		 3146{
3147 return -ENOSYS;
3148}
3149
f221e726 3150int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3151 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3152 void __user *newval, size_t newlen)
1da177e4
LT		 3153{
3154 return -ENOSYS;
3155}
3156
b89a8171 3157#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3158
7058cb02
EB		 3159static int deprecated_sysctl_warning(struct __sysctl_args *args)
3160{
3161 static int msg_count;
3162 int name[CTL_MAXNAME];
3163 int i;
3164
6fc48af8
TH		 3165 /* Check args->nlen. */
3166 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3167 return -ENOTDIR;
3168
7058cb02
EB		 3169 /* Read in the sysctl name for better debug message logging */
3170 for (i = 0; i < args->nlen; i++)
3171 if (get_user(name[i], args->name + i))
3172 return -EFAULT;
3173
3174 /* Ignore accesses to kernel.version */
3175 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3176 return 0;
3177
3178 if (msg_count < 5) {
3179 msg_count++;
3180 printk(KERN_INFO
3181 "warning: process `%s' used the deprecated sysctl "
3182 "system call with ", current->comm);
3183 for (i = 0; i < args->nlen; i++)
3184 printk("%d.", name[i]);
3185 printk("\n");
3186 }
3187 return 0;
3188}
3189
1da177e4
LT		 3190/*
3191 * No sense putting this after each symbol definition, twice,
3192 * exception granted :-)
3193 */
3194EXPORT_SYMBOL(proc_dointvec);
3195EXPORT_SYMBOL(proc_dointvec_jiffies);
3196EXPORT_SYMBOL(proc_dointvec_minmax);
3197EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3198EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3199EXPORT_SYMBOL(proc_dostring);
3200EXPORT_SYMBOL(proc_doulongvec_minmax);
3201EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3202EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3203EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3204EXPORT_SYMBOL(sysctl_intvec);
3205EXPORT_SYMBOL(sysctl_jiffies);
3206EXPORT_SYMBOL(sysctl_ms_jiffies);
3207EXPORT_SYMBOL(sysctl_string);
49a0c458 3208EXPORT_SYMBOL(sysctl_data);
1da177e4 3209EXPORT_SYMBOL(unregister_sysctl_table);
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