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ocfs2: Initialize blocks allocated to local quota file
[linux-block.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>
12e22c5e 52#include <linux/slow-work.h>
1ccd1549 53#include <linux/perf_counter.h>
1da177e4
LT		 54
55#include <asm/uaccess.h>
56#include <asm/processor.h>
57
29cbc78b
AK		 58#ifdef CONFIG_X86
59#include <asm/nmi.h>
0741f4d2 60#include <asm/stacktrace.h>
6e7c4025 61#include <asm/io.h>
29cbc78b
AK		 62#endif
63
7058cb02
EB		 64static int deprecated_sysctl_warning(struct __sysctl_args *args);
65
1da177e4
LT		 66#if defined(CONFIG_SYSCTL)
67
68/* External variables not in a header file. */
69extern int C_A_D;
45807a1d 70extern int print_fatal_signals;
1da177e4
LT		 71extern int sysctl_overcommit_memory;
72extern int sysctl_overcommit_ratio;
fadd8fbd 73extern int sysctl_panic_on_oom;
fe071d7e 74extern int sysctl_oom_kill_allocating_task;
fef1bdd6 75extern int sysctl_oom_dump_tasks;
1da177e4 76extern int max_threads;
1da177e4 77extern int core_uses_pid;
d6e71144 78extern int suid_dumpable;
1da177e4 79extern char core_pattern[];
1da177e4
LT		 80extern int pid_max;
81extern int min_free_kbytes;
1da177e4 82extern int pid_max_min, pid_max_max;
9d0243bc 83extern int sysctl_drop_caches;
8ad4b1fb 84extern int percpu_pagelist_fraction;
bebfa101 85extern int compat_log;
9745512c 86extern int latencytop_enabled;
eceea0b3 87extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 88#ifndef CONFIG_MMU
89extern int sysctl_nr_trim_pages;
90#endif
31a72bce
PM		 91#ifdef CONFIG_RCU_TORTURE_TEST
92extern int rcutorture_runnable;
93#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 94
c4f3b63f 95/* Constants used for minimum and maximum */
195cf453 96#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 97static int sixty = 60;
9383d967 98static int neg_one = -1;
c4f3b63f
RT		 99#endif
100
c4f3b63f 101static int zero;
cd5f9a4c
LT		 102static int __maybe_unused one = 1;
103static int __maybe_unused two = 2;
fc3501d4 104static unsigned long one_ul = 1;
c4f3b63f
RT		 105static int one_hundred = 100;
106
9e4a5bda
AR		 107/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
108static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
109
1da177e4
LT		 110/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
111static int maxolduid = 65535;
112static int minolduid;
8ad4b1fb 113static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 114
115static int ngroups_max = NGROUPS_MAX;
116
a1ef5adb 117#ifdef CONFIG_MODULES
1da177e4 118extern char modprobe_path[];
3d43321b 119extern int modules_disabled;
1da177e4 120#endif
1da177e4
LT		 121#ifdef CONFIG_CHR_DEV_SG
122extern int sg_big_buff;
123#endif
1da177e4 124
72c57ed5 125#ifdef CONFIG_SPARC
17f04fbb 126#include <asm/system.h>
1da177e4
LT		 127#endif
128
0871420f
DM		 129#ifdef CONFIG_SPARC64
130extern int sysctl_tsb_ratio;
131#endif
132
1da177e4
LT		 133#ifdef __hppa__
134extern int pwrsw_enabled;
135extern int unaligned_enabled;
136#endif
137
347a8dc3 138#ifdef CONFIG_S390
1da177e4
LT		 139#ifdef CONFIG_MATHEMU
140extern int sysctl_ieee_emulation_warnings;
141#endif
142extern int sysctl_userprocess_debug;
951f22d5 143extern int spin_retry;
1da177e4
LT		 144#endif
145
1da177e4
LT		 146#ifdef CONFIG_BSD_PROCESS_ACCT
147extern int acct_parm[];
148#endif
149
d2b176ed
JS		 150#ifdef CONFIG_IA64
151extern int no_unaligned_warning;
88fc241f 152extern int unaligned_dump_stack;
d2b176ed
JS		 153#endif
154
23f78d4a
IM		 155#ifdef CONFIG_RT_MUTEXES
156extern int max_lock_depth;
157#endif
158
d6f8ff73 159#ifdef CONFIG_PROC_SYSCTL
d8217f07 160static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 161 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 162static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 163 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 164#endif
9ec52099 165
d8217f07 166static struct ctl_table root_table[];
e51b6ba0
EB		 167static struct ctl_table_root sysctl_table_root;
168static struct ctl_table_header root_table_header = {
b380b0d4 169 .count = 1,
e51b6ba0 170 .ctl_table = root_table,
73455092 171 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 172 .root = &sysctl_table_root,
73455092 173 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 174};
175static struct ctl_table_root sysctl_table_root = {
176 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 177 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 178};
1da177e4 179
d8217f07
EB		 180static struct ctl_table kern_table[];
181static struct ctl_table vm_table[];
182static struct ctl_table fs_table[];
183static struct ctl_table debug_table[];
184static struct ctl_table dev_table[];
185extern struct ctl_table random_table[];
2d9048e2 186#ifdef CONFIG_INOTIFY_USER
d8217f07 187extern struct ctl_table inotify_table[];
0399cb08 188#endif
7ef9964e
DL		 189#ifdef CONFIG_EPOLL
190extern struct ctl_table epoll_table[];
191#endif
1da177e4
LT		 192
193#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
194int sysctl_legacy_va_layout;
195#endif
196
f20786ff
PZ		 197extern int prove_locking;
198extern int lock_stat;
9bc9a6bd 199
1da177e4
LT		 200/* The default sysctl tables: */
201
d8217f07 202static struct ctl_table root_table[] = {
1da177e4
LT		 203 {
204 .ctl_name = CTL_KERN,
205 .procname = "kernel",
206 .mode = 0555,
207 .child = kern_table,
208 },
209 {
210 .ctl_name = CTL_VM,
211 .procname = "vm",
212 .mode = 0555,
213 .child = vm_table,
214 },
1da177e4
LT		 215 {
216 .ctl_name = CTL_FS,
217 .procname = "fs",
218 .mode = 0555,
219 .child = fs_table,
220 },
221 {
222 .ctl_name = CTL_DEBUG,
223 .procname = "debug",
224 .mode = 0555,
225 .child = debug_table,
226 },
227 {
228 .ctl_name = CTL_DEV,
229 .procname = "dev",
230 .mode = 0555,
231 .child = dev_table,
232 },
2be7fe07
AM		 233/*
234 * NOTE: do not add new entries to this table unless you have read
235 * Documentation/sysctl/ctl_unnumbered.txt
236 */
1da177e4
LT		 237 { .ctl_name = 0 }
238};
239
77e54a1f 240#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 241static int min_sched_granularity_ns = 100000; /* 100 usecs */
242static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
243static int min_wakeup_granularity_ns; /* 0 usecs */
244static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 245#endif
246
d8217f07 247static struct ctl_table kern_table[] = {
77e54a1f
IM		 248#ifdef CONFIG_SCHED_DEBUG
249 {
250 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 251 .procname = "sched_min_granularity_ns",
252 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 253 .maxlen = sizeof(unsigned int),
254 .mode = 0644,
b2be5e96
PZ		 255 .proc_handler = &sched_nr_latency_handler,
256 .strategy = &sysctl_intvec,
257 .extra1 = &min_sched_granularity_ns,
258 .extra2 = &max_sched_granularity_ns,
77e54a1f 259 },
21805085
PZ		 260 {
261 .ctl_name = CTL_UNNUMBERED,
262 .procname = "sched_latency_ns",
263 .data = &sysctl_sched_latency,
264 .maxlen = sizeof(unsigned int),
265 .mode = 0644,
b2be5e96 266 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 267 .strategy = &sysctl_intvec,
268 .extra1 = &min_sched_granularity_ns,
269 .extra2 = &max_sched_granularity_ns,
270 },
77e54a1f
IM		 271 {
272 .ctl_name = CTL_UNNUMBERED,
273 .procname = "sched_wakeup_granularity_ns",
274 .data = &sysctl_sched_wakeup_granularity,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
277 .proc_handler = &proc_dointvec_minmax,
278 .strategy = &sysctl_intvec,
77e54a1f
IM		 279 .extra1 = &min_wakeup_granularity_ns,
280 .extra2 = &max_wakeup_granularity_ns,
281 },
2398f2c6
PZ		 282 {
283 .ctl_name = CTL_UNNUMBERED,
284 .procname = "sched_shares_ratelimit",
285 .data = &sysctl_sched_shares_ratelimit,
286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
288 .proc_handler = &proc_dointvec,
289 },
ffda12a1
PZ		 290 {
291 .ctl_name = CTL_UNNUMBERED,
292 .procname = "sched_shares_thresh",
293 .data = &sysctl_sched_shares_thresh,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
296 .proc_handler = &proc_dointvec_minmax,
297 .strategy = &sysctl_intvec,
298 .extra1 = &zero,
299 },
77e54a1f
IM		 300 {
301 .ctl_name = CTL_UNNUMBERED,
302 .procname = "sched_child_runs_first",
303 .data = &sysctl_sched_child_runs_first,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
306 .proc_handler = &proc_dointvec,
307 },
1fc84aaa
PZ		 308 {
309 .ctl_name = CTL_UNNUMBERED,
310 .procname = "sched_features",
311 .data = &sysctl_sched_features,
312 .maxlen = sizeof(unsigned int),
313 .mode = 0644,
314 .proc_handler = &proc_dointvec,
315 },
da84d961
IM		 316 {
317 .ctl_name = CTL_UNNUMBERED,
318 .procname = "sched_migration_cost",
319 .data = &sysctl_sched_migration_cost,
320 .maxlen = sizeof(unsigned int),
321 .mode = 0644,
322 .proc_handler = &proc_dointvec,
323 },
b82d9fdd
PZ		 324 {
325 .ctl_name = CTL_UNNUMBERED,
326 .procname = "sched_nr_migrate",
327 .data = &sysctl_sched_nr_migrate,
328 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 329 .mode = 0644,
330 .proc_handler = &proc_dointvec,
331 },
cd1bb94b
AB		 332 {
333 .ctl_name = CTL_UNNUMBERED,
334 .procname = "timer_migration",
335 .data = &sysctl_timer_migration,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
bfdb4d9f
AB		 338 .proc_handler = &proc_dointvec_minmax,
339 .strategy = &sysctl_intvec,
340 .extra1 = &zero,
341 .extra2 = &one,
fa85ae24 342 },
1fc84aaa 343#endif
9f0c1e56
PZ		 344 {
345 .ctl_name = CTL_UNNUMBERED,
346 .procname = "sched_rt_period_us",
347 .data = &sysctl_sched_rt_period,
348 .maxlen = sizeof(unsigned int),
349 .mode = 0644,
d0b27fa7 350 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 351 },
352 {
353 .ctl_name = CTL_UNNUMBERED,
354 .procname = "sched_rt_runtime_us",
355 .data = &sysctl_sched_rt_runtime,
356 .maxlen = sizeof(int),
357 .mode = 0644,
d0b27fa7 358 .proc_handler = &sched_rt_handler,
9f0c1e56 359 },
1799e35d
IM		 360 {
361 .ctl_name = CTL_UNNUMBERED,
362 .procname = "sched_compat_yield",
363 .data = &sysctl_sched_compat_yield,
364 .maxlen = sizeof(unsigned int),
365 .mode = 0644,
366 .proc_handler = &proc_dointvec,
367 },
f20786ff
PZ		 368#ifdef CONFIG_PROVE_LOCKING
369 {
370 .ctl_name = CTL_UNNUMBERED,
371 .procname = "prove_locking",
372 .data = &prove_locking,
373 .maxlen = sizeof(int),
374 .mode = 0644,
375 .proc_handler = &proc_dointvec,
376 },
377#endif
378#ifdef CONFIG_LOCK_STAT
379 {
380 .ctl_name = CTL_UNNUMBERED,
381 .procname = "lock_stat",
382 .data = &lock_stat,
383 .maxlen = sizeof(int),
384 .mode = 0644,
385 .proc_handler = &proc_dointvec,
386 },
77e54a1f 387#endif
1da177e4
LT		 388 {
389 .ctl_name = KERN_PANIC,
390 .procname = "panic",
391 .data = &panic_timeout,
392 .maxlen = sizeof(int),
393 .mode = 0644,
394 .proc_handler = &proc_dointvec,
395 },
396 {
397 .ctl_name = KERN_CORE_USES_PID,
398 .procname = "core_uses_pid",
399 .data = &core_uses_pid,
400 .maxlen = sizeof(int),
401 .mode = 0644,
402 .proc_handler = &proc_dointvec,
403 },
404 {
405 .ctl_name = KERN_CORE_PATTERN,
406 .procname = "core_pattern",
407 .data = core_pattern,
71ce92f3 408 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 409 .mode = 0644,
410 .proc_handler = &proc_dostring,
411 .strategy = &sysctl_string,
412 },
34f5a398 413#ifdef CONFIG_PROC_SYSCTL
1da177e4 414 {
1da177e4 415 .procname = "tainted",
25ddbb18 416 .maxlen = sizeof(long),
34f5a398 417 .mode = 0644,
25ddbb18 418 .proc_handler = &proc_taint,
1da177e4 419 },
34f5a398 420#endif
9745512c
AV		 421#ifdef CONFIG_LATENCYTOP
422 {
423 .procname = "latencytop",
424 .data = &latencytop_enabled,
425 .maxlen = sizeof(int),
426 .mode = 0644,
427 .proc_handler = &proc_dointvec,
428 },
429#endif
1da177e4
LT		 430#ifdef CONFIG_BLK_DEV_INITRD
431 {
432 .ctl_name = KERN_REALROOTDEV,
433 .procname = "real-root-dev",
434 .data = &real_root_dev,
435 .maxlen = sizeof(int),
436 .mode = 0644,
437 .proc_handler = &proc_dointvec,
438 },
439#endif
45807a1d
IM		 440 {
441 .ctl_name = CTL_UNNUMBERED,
442 .procname = "print-fatal-signals",
443 .data = &print_fatal_signals,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = &proc_dointvec,
447 },
72c57ed5 448#ifdef CONFIG_SPARC
1da177e4
LT		 449 {
450 .ctl_name = KERN_SPARC_REBOOT,
451 .procname = "reboot-cmd",
452 .data = reboot_command,
453 .maxlen = 256,
454 .mode = 0644,
455 .proc_handler = &proc_dostring,
456 .strategy = &sysctl_string,
457 },
458 {
459 .ctl_name = KERN_SPARC_STOP_A,
460 .procname = "stop-a",
461 .data = &stop_a_enabled,
462 .maxlen = sizeof (int),
463 .mode = 0644,
464 .proc_handler = &proc_dointvec,
465 },
466 {
467 .ctl_name = KERN_SPARC_SCONS_PWROFF,
468 .procname = "scons-poweroff",
469 .data = &scons_pwroff,
470 .maxlen = sizeof (int),
471 .mode = 0644,
472 .proc_handler = &proc_dointvec,
473 },
474#endif
0871420f
DM		 475#ifdef CONFIG_SPARC64
476 {
477 .ctl_name = CTL_UNNUMBERED,
478 .procname = "tsb-ratio",
479 .data = &sysctl_tsb_ratio,
480 .maxlen = sizeof (int),
481 .mode = 0644,
482 .proc_handler = &proc_dointvec,
483 },
484#endif
1da177e4
LT		 485#ifdef __hppa__
486 {
487 .ctl_name = KERN_HPPA_PWRSW,
488 .procname = "soft-power",
489 .data = &pwrsw_enabled,
490 .maxlen = sizeof (int),
491 .mode = 0644,
492 .proc_handler = &proc_dointvec,
493 },
494 {
495 .ctl_name = KERN_HPPA_UNALIGNED,
496 .procname = "unaligned-trap",
497 .data = &unaligned_enabled,
498 .maxlen = sizeof (int),
499 .mode = 0644,
500 .proc_handler = &proc_dointvec,
501 },
502#endif
503 {
504 .ctl_name = KERN_CTLALTDEL,
505 .procname = "ctrl-alt-del",
506 .data = &C_A_D,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = &proc_dointvec,
510 },
606576ce 511#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 512 {
513 .ctl_name = CTL_UNNUMBERED,
514 .procname = "ftrace_enabled",
515 .data = &ftrace_enabled,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = &ftrace_enable_sysctl,
519 },
520#endif
f38f1d2a
SR		 521#ifdef CONFIG_STACK_TRACER
522 {
523 .ctl_name = CTL_UNNUMBERED,
524 .procname = "stack_tracer_enabled",
525 .data = &stack_tracer_enabled,
526 .maxlen = sizeof(int),
527 .mode = 0644,
528 .proc_handler = &stack_trace_sysctl,
529 },
530#endif
944ac425
SR		 531#ifdef CONFIG_TRACING
532 {
533 .ctl_name = CTL_UNNUMBERED,
3299b4dd 534 .procname = "ftrace_dump_on_oops",
944ac425
SR		 535 .data = &ftrace_dump_on_oops,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = &proc_dointvec,
539 },
540#endif
a1ef5adb 541#ifdef CONFIG_MODULES
1da177e4
LT		 542 {
543 .ctl_name = KERN_MODPROBE,
544 .procname = "modprobe",
545 .data = &modprobe_path,
546 .maxlen = KMOD_PATH_LEN,
547 .mode = 0644,
548 .proc_handler = &proc_dostring,
549 .strategy = &sysctl_string,
550 },
3d43321b
KC		 551 {
552 .ctl_name = CTL_UNNUMBERED,
553 .procname = "modules_disabled",
554 .data = &modules_disabled,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 /* only handle a transition from default "0" to "1" */
558 .proc_handler = &proc_dointvec_minmax,
559 .extra1 = &one,
560 .extra2 = &one,
561 },
1da177e4 562#endif
57ae2508 563#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 564 {
565 .ctl_name = KERN_HOTPLUG,
566 .procname = "hotplug",
312c004d
KS		 567 .data = &uevent_helper,
568 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 569 .mode = 0644,
570 .proc_handler = &proc_dostring,
571 .strategy = &sysctl_string,
572 },
573#endif
574#ifdef CONFIG_CHR_DEV_SG
575 {
576 .ctl_name = KERN_SG_BIG_BUFF,
577 .procname = "sg-big-buff",
578 .data = &sg_big_buff,
579 .maxlen = sizeof (int),
580 .mode = 0444,
581 .proc_handler = &proc_dointvec,
582 },
583#endif
584#ifdef CONFIG_BSD_PROCESS_ACCT
585 {
586 .ctl_name = KERN_ACCT,
587 .procname = "acct",
588 .data = &acct_parm,
589 .maxlen = 3*sizeof(int),
590 .mode = 0644,
591 .proc_handler = &proc_dointvec,
592 },
593#endif
1da177e4
LT		 594#ifdef CONFIG_MAGIC_SYSRQ
595 {
596 .ctl_name = KERN_SYSRQ,
597 .procname = "sysrq",
5d6f647f 598 .data = &__sysrq_enabled,
1da177e4
LT		 599 .maxlen = sizeof (int),
600 .mode = 0644,
601 .proc_handler = &proc_dointvec,
602 },
603#endif
d6f8ff73 604#ifdef CONFIG_PROC_SYSCTL
1da177e4 605 {
1da177e4 606 .procname = "cad_pid",
9ec52099 607 .data = NULL,
1da177e4
LT		 608 .maxlen = sizeof (int),
609 .mode = 0600,
9ec52099 610 .proc_handler = &proc_do_cad_pid,
1da177e4 611 },
d6f8ff73 612#endif
1da177e4
LT		 613 {
614 .ctl_name = KERN_MAX_THREADS,
615 .procname = "threads-max",
616 .data = &max_threads,
617 .maxlen = sizeof(int),
618 .mode = 0644,
619 .proc_handler = &proc_dointvec,
620 },
621 {
622 .ctl_name = KERN_RANDOM,
623 .procname = "random",
624 .mode = 0555,
625 .child = random_table,
626 },
1da177e4
LT		 627 {
628 .ctl_name = KERN_OVERFLOWUID,
629 .procname = "overflowuid",
630 .data = &overflowuid,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = &proc_dointvec_minmax,
634 .strategy = &sysctl_intvec,
635 .extra1 = &minolduid,
636 .extra2 = &maxolduid,
637 },
638 {
639 .ctl_name = KERN_OVERFLOWGID,
640 .procname = "overflowgid",
641 .data = &overflowgid,
642 .maxlen = sizeof(int),
643 .mode = 0644,
644 .proc_handler = &proc_dointvec_minmax,
645 .strategy = &sysctl_intvec,
646 .extra1 = &minolduid,
647 .extra2 = &maxolduid,
648 },
347a8dc3 649#ifdef CONFIG_S390
1da177e4
LT		 650#ifdef CONFIG_MATHEMU
651 {
652 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
653 .procname = "ieee_emulation_warnings",
654 .data = &sysctl_ieee_emulation_warnings,
655 .maxlen = sizeof(int),
656 .mode = 0644,
657 .proc_handler = &proc_dointvec,
658 },
1da177e4
LT		 659#endif
660 {
661 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
662 .procname = "userprocess_debug",
663 .data = &sysctl_userprocess_debug,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 .proc_handler = &proc_dointvec,
667 },
668#endif
669 {
670 .ctl_name = KERN_PIDMAX,
671 .procname = "pid_max",
672 .data = &pid_max,
673 .maxlen = sizeof (int),
674 .mode = 0644,
675 .proc_handler = &proc_dointvec_minmax,
676 .strategy = sysctl_intvec,
677 .extra1 = &pid_max_min,
678 .extra2 = &pid_max_max,
679 },
680 {
681 .ctl_name = KERN_PANIC_ON_OOPS,
682 .procname = "panic_on_oops",
683 .data = &panic_on_oops,
684 .maxlen = sizeof(int),
685 .mode = 0644,
686 .proc_handler = &proc_dointvec,
687 },
7ef3d2fd
JP		 688#if defined CONFIG_PRINTK
689 {
690 .ctl_name = KERN_PRINTK,
691 .procname = "printk",
692 .data = &console_loglevel,
693 .maxlen = 4*sizeof(int),
694 .mode = 0644,
695 .proc_handler = &proc_dointvec,
696 },
1da177e4
LT		 697 {
698 .ctl_name = KERN_PRINTK_RATELIMIT,
699 .procname = "printk_ratelimit",
717115e1 700 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = &proc_dointvec_jiffies,
704 .strategy = &sysctl_jiffies,
705 },
706 {
707 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
708 .procname = "printk_ratelimit_burst",
717115e1 709 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = &proc_dointvec,
713 },
7ef3d2fd 714#endif
1da177e4
LT		 715 {
716 .ctl_name = KERN_NGROUPS_MAX,
717 .procname = "ngroups_max",
718 .data = &ngroups_max,
719 .maxlen = sizeof (int),
720 .mode = 0444,
721 .proc_handler = &proc_dointvec,
722 },
723#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
724 {
725 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
726 .procname = "unknown_nmi_panic",
727 .data = &unknown_nmi_panic,
728 .maxlen = sizeof (int),
729 .mode = 0644,
2fbe7b25 730 .proc_handler = &proc_dointvec,
1da177e4 731 },
407984f1 732 {
407984f1
DZ		 733 .procname = "nmi_watchdog",
734 .data = &nmi_watchdog_enabled,
735 .maxlen = sizeof (int),
736 .mode = 0644,
737 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 738 },
739#endif
740#if defined(CONFIG_X86)
8da5adda
DZ		 741 {
742 .ctl_name = KERN_PANIC_ON_NMI,
743 .procname = "panic_on_unrecovered_nmi",
744 .data = &panic_on_unrecovered_nmi,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = &proc_dointvec,
748 },
5211a242
KG		 749 {
750 .ctl_name = CTL_UNNUMBERED,
751 .procname = "panic_on_io_nmi",
752 .data = &panic_on_io_nmi,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = &proc_dointvec,
756 },
1da177e4
LT		 757 {
758 .ctl_name = KERN_BOOTLOADER_TYPE,
759 .procname = "bootloader_type",
760 .data = &bootloader_type,
761 .maxlen = sizeof (int),
762 .mode = 0444,
763 .proc_handler = &proc_dointvec,
764 },
5031296c
PA		 765 {
766 .ctl_name = CTL_UNNUMBERED,
767 .procname = "bootloader_version",
768 .data = &bootloader_version,
769 .maxlen = sizeof (int),
770 .mode = 0444,
771 .proc_handler = &proc_dointvec,
772 },
0741f4d2
CE		 773 {
774 .ctl_name = CTL_UNNUMBERED,
775 .procname = "kstack_depth_to_print",
776 .data = &kstack_depth_to_print,
777 .maxlen = sizeof(int),
778 .mode = 0644,
779 .proc_handler = &proc_dointvec,
780 },
6e7c4025
IM		 781 {
782 .ctl_name = CTL_UNNUMBERED,
783 .procname = "io_delay_type",
784 .data = &io_delay_type,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = &proc_dointvec,
788 },
1da177e4 789#endif
7a9166e3 790#if defined(CONFIG_MMU)
1da177e4
LT		 791 {
792 .ctl_name = KERN_RANDOMIZE,
793 .procname = "randomize_va_space",
794 .data = &randomize_va_space,
795 .maxlen = sizeof(int),
796 .mode = 0644,
797 .proc_handler = &proc_dointvec,
798 },
7a9166e3 799#endif
0152fb37 800#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 801 {
802 .ctl_name = KERN_SPIN_RETRY,
803 .procname = "spin_retry",
804 .data = &spin_retry,
805 .maxlen = sizeof (int),
806 .mode = 0644,
807 .proc_handler = &proc_dointvec,
808 },
c255d844 809#endif
673d5b43 810#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 811 {
c255d844 812 .procname = "acpi_video_flags",
77afcf78 813 .data = &acpi_realmode_flags,
c255d844
PM		 814 .maxlen = sizeof (unsigned long),
815 .mode = 0644,
7f99f06f 816 .proc_handler = &proc_doulongvec_minmax,
c255d844 817 },
d2b176ed
JS		 818#endif
819#ifdef CONFIG_IA64
820 {
821 .ctl_name = KERN_IA64_UNALIGNED,
822 .procname = "ignore-unaligned-usertrap",
823 .data = &no_unaligned_warning,
824 .maxlen = sizeof (int),
825 .mode = 0644,
826 .proc_handler = &proc_dointvec,
827 },
88fc241f
DC		 828 {
829 .ctl_name = CTL_UNNUMBERED,
830 .procname = "unaligned-dump-stack",
831 .data = &unaligned_dump_stack,
832 .maxlen = sizeof (int),
833 .mode = 0644,
834 .proc_handler = &proc_dointvec,
835 },
bebfa101 836#endif
c4f3b63f 837#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 838 {
839 .ctl_name = CTL_UNNUMBERED,
840 .procname = "softlockup_panic",
841 .data = &softlockup_panic,
842 .maxlen = sizeof(int),
843 .mode = 0644,
4dca10a9 844 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 845 .strategy = &sysctl_intvec,
846 .extra1 = &zero,
847 .extra2 = &one,
848 },
c4f3b63f
RT		 849 {
850 .ctl_name = CTL_UNNUMBERED,
851 .procname = "softlockup_thresh",
852 .data = &softlockup_thresh,
9383d967 853 .maxlen = sizeof(int),
c4f3b63f 854 .mode = 0644,
baf48f65 855 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 856 .strategy = &sysctl_intvec,
9383d967 857 .extra1 = &neg_one,
c4f3b63f
RT		 858 .extra2 = &sixty,
859 },
e162b39a
MSB		 860#endif
861#ifdef CONFIG_DETECT_HUNG_TASK
862 {
863 .ctl_name = CTL_UNNUMBERED,
864 .procname = "hung_task_panic",
865 .data = &sysctl_hung_task_panic,
866 .maxlen = sizeof(int),
867 .mode = 0644,
868 .proc_handler = &proc_dointvec_minmax,
869 .strategy = &sysctl_intvec,
870 .extra1 = &zero,
871 .extra2 = &one,
872 },
82a1fcb9
IM		 873 {
874 .ctl_name = CTL_UNNUMBERED,
875 .procname = "hung_task_check_count",
876 .data = &sysctl_hung_task_check_count,
90739081 877 .maxlen = sizeof(unsigned long),
82a1fcb9 878 .mode = 0644,
90739081 879 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 880 .strategy = &sysctl_intvec,
881 },
882 {
883 .ctl_name = CTL_UNNUMBERED,
884 .procname = "hung_task_timeout_secs",
885 .data = &sysctl_hung_task_timeout_secs,
90739081 886 .maxlen = sizeof(unsigned long),
82a1fcb9 887 .mode = 0644,
e162b39a 888 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 889 .strategy = &sysctl_intvec,
890 },
891 {
892 .ctl_name = CTL_UNNUMBERED,
893 .procname = "hung_task_warnings",
894 .data = &sysctl_hung_task_warnings,
90739081 895 .maxlen = sizeof(unsigned long),
82a1fcb9 896 .mode = 0644,
90739081 897 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 898 .strategy = &sysctl_intvec,
899 },
c4f3b63f 900#endif
bebfa101
AK		 901#ifdef CONFIG_COMPAT
902 {
903 .ctl_name = KERN_COMPAT_LOG,
904 .procname = "compat-log",
905 .data = &compat_log,
906 .maxlen = sizeof (int),
907 .mode = 0644,
908 .proc_handler = &proc_dointvec,
909 },
951f22d5 910#endif
23f78d4a
IM		 911#ifdef CONFIG_RT_MUTEXES
912 {
913 .ctl_name = KERN_MAX_LOCK_DEPTH,
914 .procname = "max_lock_depth",
915 .data = &max_lock_depth,
916 .maxlen = sizeof(int),
917 .mode = 0644,
918 .proc_handler = &proc_dointvec,
919 },
5096add8 920#endif
10a0a8d4
JF		 921 {
922 .ctl_name = CTL_UNNUMBERED,
923 .procname = "poweroff_cmd",
924 .data = &poweroff_cmd,
925 .maxlen = POWEROFF_CMD_PATH_LEN,
926 .mode = 0644,
927 .proc_handler = &proc_dostring,
928 .strategy = &sysctl_string,
929 },
0b77f5bf
DH		 930#ifdef CONFIG_KEYS
931 {
932 .ctl_name = CTL_UNNUMBERED,
933 .procname = "keys",
934 .mode = 0555,
935 .child = key_sysctls,
936 },
937#endif
31a72bce
PM		 938#ifdef CONFIG_RCU_TORTURE_TEST
939 {
940 .ctl_name = CTL_UNNUMBERED,
941 .procname = "rcutorture_runnable",
942 .data = &rcutorture_runnable,
943 .maxlen = sizeof(int),
944 .mode = 0644,
945 .proc_handler = &proc_dointvec,
946 },
947#endif
12e22c5e
DH		 948#ifdef CONFIG_SLOW_WORK
949 {
950 .ctl_name = CTL_UNNUMBERED,
951 .procname = "slow-work",
952 .mode = 0555,
953 .child = slow_work_sysctls,
954 },
955#endif
1ccd1549
PZ		 956#ifdef CONFIG_PERF_COUNTERS
957 {
958 .ctl_name = CTL_UNNUMBERED,
0764771d
PZ		 959 .procname = "perf_counter_paranoid",
960 .data = &sysctl_perf_counter_paranoid,
961 .maxlen = sizeof(sysctl_perf_counter_paranoid),
1ccd1549
PZ		 962 .mode = 0644,
963 .proc_handler = &proc_dointvec,
964 },
c5078f78
PZ		 965 {
966 .ctl_name = CTL_UNNUMBERED,
967 .procname = "perf_counter_mlock_kb",
968 .data = &sysctl_perf_counter_mlock,
969 .maxlen = sizeof(sysctl_perf_counter_mlock),
970 .mode = 0644,
971 .proc_handler = &proc_dointvec,
972 },
a78ac325
PZ		 973 {
974 .ctl_name = CTL_UNNUMBERED,
df58ab24
PZ		 975 .procname = "perf_counter_max_sample_rate",
976 .data = &sysctl_perf_counter_sample_rate,
977 .maxlen = sizeof(sysctl_perf_counter_sample_rate),
a78ac325
PZ		 978 .mode = 0644,
979 .proc_handler = &proc_dointvec,
980 },
1ccd1549 981#endif
dfec072e
VN		 982#ifdef CONFIG_KMEMCHECK
983 {
984 .ctl_name = CTL_UNNUMBERED,
985 .procname = "kmemcheck",
986 .data = &kmemcheck_enabled,
987 .maxlen = sizeof(int),
988 .mode = 0644,
989 .proc_handler = &proc_dointvec,
990 },
991#endif
992
ed2c12f3
AM		 993/*
994 * NOTE: do not add new entries to this table unless you have read
995 * Documentation/sysctl/ctl_unnumbered.txt
996 */
1da177e4
LT		 997 { .ctl_name = 0 }
998};
999
d8217f07 1000static struct ctl_table vm_table[] = {
1da177e4
LT		 1001 {
1002 .ctl_name = VM_OVERCOMMIT_MEMORY,
1003 .procname = "overcommit_memory",
1004 .data = &sysctl_overcommit_memory,
1005 .maxlen = sizeof(sysctl_overcommit_memory),
1006 .mode = 0644,
1007 .proc_handler = &proc_dointvec,
1008 },
fadd8fbd
KH		 1009 {
1010 .ctl_name = VM_PANIC_ON_OOM,
1011 .procname = "panic_on_oom",
1012 .data = &sysctl_panic_on_oom,
1013 .maxlen = sizeof(sysctl_panic_on_oom),
1014 .mode = 0644,
1015 .proc_handler = &proc_dointvec,
1016 },
fe071d7e
DR		 1017 {
1018 .ctl_name = CTL_UNNUMBERED,
1019 .procname = "oom_kill_allocating_task",
1020 .data = &sysctl_oom_kill_allocating_task,
1021 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1022 .mode = 0644,
1023 .proc_handler = &proc_dointvec,
1024 },
fef1bdd6
DR		 1025 {
1026 .ctl_name = CTL_UNNUMBERED,
1027 .procname = "oom_dump_tasks",
1028 .data = &sysctl_oom_dump_tasks,
1029 .maxlen = sizeof(sysctl_oom_dump_tasks),
1030 .mode = 0644,
1031 .proc_handler = &proc_dointvec,
1032 },
1da177e4
LT		 1033 {
1034 .ctl_name = VM_OVERCOMMIT_RATIO,
1035 .procname = "overcommit_ratio",
1036 .data = &sysctl_overcommit_ratio,
1037 .maxlen = sizeof(sysctl_overcommit_ratio),
1038 .mode = 0644,
1039 .proc_handler = &proc_dointvec,
1040 },
1041 {
1042 .ctl_name = VM_PAGE_CLUSTER,
1043 .procname = "page-cluster",
1044 .data = &page_cluster,
1045 .maxlen = sizeof(int),
1046 .mode = 0644,
1047 .proc_handler = &proc_dointvec,
1048 },
1049 {
1050 .ctl_name = VM_DIRTY_BACKGROUND,
1051 .procname = "dirty_background_ratio",
1052 .data = &dirty_background_ratio,
1053 .maxlen = sizeof(dirty_background_ratio),
1054 .mode = 0644,
2da02997 1055 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 1056 .strategy = &sysctl_intvec,
1057 .extra1 = &zero,
1058 .extra2 = &one_hundred,
1059 },
2da02997
DR		 1060 {
1061 .ctl_name = CTL_UNNUMBERED,
1062 .procname = "dirty_background_bytes",
1063 .data = &dirty_background_bytes,
1064 .maxlen = sizeof(dirty_background_bytes),
1065 .mode = 0644,
1066 .proc_handler = &dirty_background_bytes_handler,
1067 .strategy = &sysctl_intvec,
fc3501d4 1068 .extra1 = &one_ul,
2da02997 1069 },
1da177e4
LT		 1070 {
1071 .ctl_name = VM_DIRTY_RATIO,
1072 .procname = "dirty_ratio",
1073 .data = &vm_dirty_ratio,
1074 .maxlen = sizeof(vm_dirty_ratio),
1075 .mode = 0644,
04fbfdc1 1076 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1077 .strategy = &sysctl_intvec,
1078 .extra1 = &zero,
1079 .extra2 = &one_hundred,
1080 },
2da02997
DR		 1081 {
1082 .ctl_name = CTL_UNNUMBERED,
1083 .procname = "dirty_bytes",
1084 .data = &vm_dirty_bytes,
1085 .maxlen = sizeof(vm_dirty_bytes),
1086 .mode = 0644,
1087 .proc_handler = &dirty_bytes_handler,
1088 .strategy = &sysctl_intvec,
9e4a5bda 1089 .extra1 = &dirty_bytes_min,
2da02997 1090 },
1da177e4 1091 {
1da177e4 1092 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1093 .data = &dirty_writeback_interval,
1094 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1095 .mode = 0644,
1096 .proc_handler = &dirty_writeback_centisecs_handler,
1097 },
1098 {
1da177e4 1099 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1100 .data = &dirty_expire_interval,
1101 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1102 .mode = 0644,
704503d8 1103 .proc_handler = &proc_dointvec,
1da177e4
LT		 1104 },
1105 {
1106 .ctl_name = VM_NR_PDFLUSH_THREADS,
1107 .procname = "nr_pdflush_threads",
1108 .data = &nr_pdflush_threads,
1109 .maxlen = sizeof nr_pdflush_threads,
1110 .mode = 0444 /* read-only*/,
1111 .proc_handler = &proc_dointvec,
1112 },
1113 {
1114 .ctl_name = VM_SWAPPINESS,
1115 .procname = "swappiness",
1116 .data = &vm_swappiness,
1117 .maxlen = sizeof(vm_swappiness),
1118 .mode = 0644,
1119 .proc_handler = &proc_dointvec_minmax,
1120 .strategy = &sysctl_intvec,
1121 .extra1 = &zero,
1122 .extra2 = &one_hundred,
1123 },
1124#ifdef CONFIG_HUGETLB_PAGE
1125 {
1da177e4 1126 .procname = "nr_hugepages",
e5ff2159 1127 .data = NULL,
1da177e4
LT		 1128 .maxlen = sizeof(unsigned long),
1129 .mode = 0644,
1130 .proc_handler = &hugetlb_sysctl_handler,
1131 .extra1 = (void *)&hugetlb_zero,
1132 .extra2 = (void *)&hugetlb_infinity,
1133 },
1134 {
1135 .ctl_name = VM_HUGETLB_GROUP,
1136 .procname = "hugetlb_shm_group",
1137 .data = &sysctl_hugetlb_shm_group,
1138 .maxlen = sizeof(gid_t),
1139 .mode = 0644,
1140 .proc_handler = &proc_dointvec,
1141 },
396faf03
MG		 1142 {
1143 .ctl_name = CTL_UNNUMBERED,
1144 .procname = "hugepages_treat_as_movable",
1145 .data = &hugepages_treat_as_movable,
1146 .maxlen = sizeof(int),
1147 .mode = 0644,
1148 .proc_handler = &hugetlb_treat_movable_handler,
1149 },
d1c3fb1f
NA		 1150 {
1151 .ctl_name = CTL_UNNUMBERED,
1152 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1153 .data = NULL,
1154 .maxlen = sizeof(unsigned long),
d1c3fb1f 1155 .mode = 0644,
a3d0c6aa 1156 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1157 .extra1 = (void *)&hugetlb_zero,
1158 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1159 },
1da177e4
LT		 1160#endif
1161 {
1162 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1163 .procname = "lowmem_reserve_ratio",
1164 .data = &sysctl_lowmem_reserve_ratio,
1165 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1166 .mode = 0644,
1167 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1168 .strategy = &sysctl_intvec,
1169 },
9d0243bc
AM		 1170 {
1171 .ctl_name = VM_DROP_PAGECACHE,
1172 .procname = "drop_caches",
1173 .data = &sysctl_drop_caches,
1174 .maxlen = sizeof(int),
1175 .mode = 0644,
1176 .proc_handler = drop_caches_sysctl_handler,
1177 .strategy = &sysctl_intvec,
1178 },
1da177e4
LT		 1179 {
1180 .ctl_name = VM_MIN_FREE_KBYTES,
1181 .procname = "min_free_kbytes",
1182 .data = &min_free_kbytes,
1183 .maxlen = sizeof(min_free_kbytes),
1184 .mode = 0644,
1185 .proc_handler = &min_free_kbytes_sysctl_handler,
1186 .strategy = &sysctl_intvec,
1187 .extra1 = &zero,
1188 },
8ad4b1fb
RS		 1189 {
1190 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1191 .procname = "percpu_pagelist_fraction",
1192 .data = &percpu_pagelist_fraction,
1193 .maxlen = sizeof(percpu_pagelist_fraction),
1194 .mode = 0644,
1195 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1196 .strategy = &sysctl_intvec,
1197 .extra1 = &min_percpu_pagelist_fract,
1198 },
1da177e4
LT		 1199#ifdef CONFIG_MMU
1200 {
1201 .ctl_name = VM_MAX_MAP_COUNT,
1202 .procname = "max_map_count",
1203 .data = &sysctl_max_map_count,
1204 .maxlen = sizeof(sysctl_max_map_count),
1205 .mode = 0644,
1206 .proc_handler = &proc_dointvec
1207 },
dd8632a1
PM		 1208#else
1209 {
1210 .ctl_name = CTL_UNNUMBERED,
1211 .procname = "nr_trim_pages",
1212 .data = &sysctl_nr_trim_pages,
1213 .maxlen = sizeof(sysctl_nr_trim_pages),
1214 .mode = 0644,
1215 .proc_handler = &proc_dointvec_minmax,
1216 .strategy = &sysctl_intvec,
1217 .extra1 = &zero,
1218 },
1da177e4
LT		 1219#endif
1220 {
1221 .ctl_name = VM_LAPTOP_MODE,
1222 .procname = "laptop_mode",
1223 .data = &laptop_mode,
1224 .maxlen = sizeof(laptop_mode),
1225 .mode = 0644,
ed5b43f1
BS		 1226 .proc_handler = &proc_dointvec_jiffies,
1227 .strategy = &sysctl_jiffies,
1da177e4
LT		 1228 },
1229 {
1230 .ctl_name = VM_BLOCK_DUMP,
1231 .procname = "block_dump",
1232 .data = &block_dump,
1233 .maxlen = sizeof(block_dump),
1234 .mode = 0644,
1235 .proc_handler = &proc_dointvec,
1236 .strategy = &sysctl_intvec,
1237 .extra1 = &zero,
1238 },
1239 {
1240 .ctl_name = VM_VFS_CACHE_PRESSURE,
1241 .procname = "vfs_cache_pressure",
1242 .data = &sysctl_vfs_cache_pressure,
1243 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1244 .mode = 0644,
1245 .proc_handler = &proc_dointvec,
1246 .strategy = &sysctl_intvec,
1247 .extra1 = &zero,
1248 },
1249#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1250 {
1251 .ctl_name = VM_LEGACY_VA_LAYOUT,
1252 .procname = "legacy_va_layout",
1253 .data = &sysctl_legacy_va_layout,
1254 .maxlen = sizeof(sysctl_legacy_va_layout),
1255 .mode = 0644,
1256 .proc_handler = &proc_dointvec,
1257 .strategy = &sysctl_intvec,
1258 .extra1 = &zero,
1259 },
1260#endif
1743660b
CL		 1261#ifdef CONFIG_NUMA
1262 {
1263 .ctl_name = VM_ZONE_RECLAIM_MODE,
1264 .procname = "zone_reclaim_mode",
1265 .data = &zone_reclaim_mode,
1266 .maxlen = sizeof(zone_reclaim_mode),
1267 .mode = 0644,
1268 .proc_handler = &proc_dointvec,
c84db23c
CL		 1269 .strategy = &sysctl_intvec,
1270 .extra1 = &zero,
1743660b 1271 },
9614634f
CL		 1272 {
1273 .ctl_name = VM_MIN_UNMAPPED,
1274 .procname = "min_unmapped_ratio",
1275 .data = &sysctl_min_unmapped_ratio,
1276 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1277 .mode = 0644,
1278 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1279 .strategy = &sysctl_intvec,
1280 .extra1 = &zero,
1281 .extra2 = &one_hundred,
1282 },
0ff38490
CL		 1283 {
1284 .ctl_name = VM_MIN_SLAB,
1285 .procname = "min_slab_ratio",
1286 .data = &sysctl_min_slab_ratio,
1287 .maxlen = sizeof(sysctl_min_slab_ratio),
1288 .mode = 0644,
1289 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1290 .strategy = &sysctl_intvec,
1291 .extra1 = &zero,
1292 .extra2 = &one_hundred,
1293 },
e6e5494c 1294#endif
77461ab3
CL		 1295#ifdef CONFIG_SMP
1296 {
1297 .ctl_name = CTL_UNNUMBERED,
1298 .procname = "stat_interval",
1299 .data = &sysctl_stat_interval,
1300 .maxlen = sizeof(sysctl_stat_interval),
1301 .mode = 0644,
1302 .proc_handler = &proc_dointvec_jiffies,
1303 .strategy = &sysctl_jiffies,
1304 },
1305#endif
ed032189
EP		 1306 {
1307 .ctl_name = CTL_UNNUMBERED,
1308 .procname = "mmap_min_addr",
1309 .data = &mmap_min_addr,
1310 .maxlen = sizeof(unsigned long),
1311 .mode = 0644,
1312 .proc_handler = &proc_doulongvec_minmax,
1313 },
f0c0b2b8
KH		 1314#ifdef CONFIG_NUMA
1315 {
1316 .ctl_name = CTL_UNNUMBERED,
1317 .procname = "numa_zonelist_order",
1318 .data = &numa_zonelist_order,
1319 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1320 .mode = 0644,
1321 .proc_handler = &numa_zonelist_order_handler,
1322 .strategy = &sysctl_string,
1323 },
1324#endif
2b8232ce 1325#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1326 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1327 {
1328 .ctl_name = VM_VDSO_ENABLED,
1329 .procname = "vdso_enabled",
1330 .data = &vdso_enabled,
1331 .maxlen = sizeof(vdso_enabled),
1332 .mode = 0644,
1333 .proc_handler = &proc_dointvec,
1334 .strategy = &sysctl_intvec,
1335 .extra1 = &zero,
1336 },
1da177e4 1337#endif
195cf453
BG		 1338#ifdef CONFIG_HIGHMEM
1339 {
1340 .ctl_name = CTL_UNNUMBERED,
1341 .procname = "highmem_is_dirtyable",
1342 .data = &vm_highmem_is_dirtyable,
1343 .maxlen = sizeof(vm_highmem_is_dirtyable),
1344 .mode = 0644,
1345 .proc_handler = &proc_dointvec_minmax,
1346 .strategy = &sysctl_intvec,
1347 .extra1 = &zero,
1348 .extra2 = &one,
1349 },
1350#endif
4be6f6bb
PZ		 1351 {
1352 .ctl_name = CTL_UNNUMBERED,
1353 .procname = "scan_unevictable_pages",
1354 .data = &scan_unevictable_pages,
1355 .maxlen = sizeof(scan_unevictable_pages),
1356 .mode = 0644,
1357 .proc_handler = &scan_unevictable_handler,
1358 },
2be7fe07
AM		 1359/*
1360 * NOTE: do not add new entries to this table unless you have read
1361 * Documentation/sysctl/ctl_unnumbered.txt
1362 */
1da177e4
LT		 1363 { .ctl_name = 0 }
1364};
1365
2abc26fc 1366#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1367static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1368 { .ctl_name = 0 }
1369};
1370#endif
1371
d8217f07 1372static struct ctl_table fs_table[] = {
1da177e4
LT		 1373 {
1374 .ctl_name = FS_NRINODE,
1375 .procname = "inode-nr",
1376 .data = &inodes_stat,
1377 .maxlen = 2*sizeof(int),
1378 .mode = 0444,
1379 .proc_handler = &proc_dointvec,
1380 },
1381 {
1382 .ctl_name = FS_STATINODE,
1383 .procname = "inode-state",
1384 .data = &inodes_stat,
1385 .maxlen = 7*sizeof(int),
1386 .mode = 0444,
1387 .proc_handler = &proc_dointvec,
1388 },
1389 {
1da177e4
LT		 1390 .procname = "file-nr",
1391 .data = &files_stat,
1392 .maxlen = 3*sizeof(int),
1393 .mode = 0444,
529bf6be 1394 .proc_handler = &proc_nr_files,
1da177e4
LT		 1395 },
1396 {
1397 .ctl_name = FS_MAXFILE,
1398 .procname = "file-max",
1399 .data = &files_stat.max_files,
1400 .maxlen = sizeof(int),
1401 .mode = 0644,
1402 .proc_handler = &proc_dointvec,
1403 },
9cfe015a
ED		 1404 {
1405 .ctl_name = CTL_UNNUMBERED,
1406 .procname = "nr_open",
1407 .data = &sysctl_nr_open,
1408 .maxlen = sizeof(int),
1409 .mode = 0644,
eceea0b3
AV		 1410 .proc_handler = &proc_dointvec_minmax,
1411 .extra1 = &sysctl_nr_open_min,
1412 .extra2 = &sysctl_nr_open_max,
9cfe015a 1413 },
1da177e4
LT		 1414 {
1415 .ctl_name = FS_DENTRY,
1416 .procname = "dentry-state",
1417 .data = &dentry_stat,
1418 .maxlen = 6*sizeof(int),
1419 .mode = 0444,
1420 .proc_handler = &proc_dointvec,
1421 },
1422 {
1423 .ctl_name = FS_OVERFLOWUID,
1424 .procname = "overflowuid",
1425 .data = &fs_overflowuid,
1426 .maxlen = sizeof(int),
1427 .mode = 0644,
1428 .proc_handler = &proc_dointvec_minmax,
1429 .strategy = &sysctl_intvec,
1430 .extra1 = &minolduid,
1431 .extra2 = &maxolduid,
1432 },
1433 {
1434 .ctl_name = FS_OVERFLOWGID,
1435 .procname = "overflowgid",
1436 .data = &fs_overflowgid,
1437 .maxlen = sizeof(int),
1438 .mode = 0644,
1439 .proc_handler = &proc_dointvec_minmax,
1440 .strategy = &sysctl_intvec,
1441 .extra1 = &minolduid,
1442 .extra2 = &maxolduid,
1443 },
bfcd17a6 1444#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1445 {
1446 .ctl_name = FS_LEASES,
1447 .procname = "leases-enable",
1448 .data = &leases_enable,
1449 .maxlen = sizeof(int),
1450 .mode = 0644,
1451 .proc_handler = &proc_dointvec,
1452 },
bfcd17a6 1453#endif
1da177e4
LT		 1454#ifdef CONFIG_DNOTIFY
1455 {
1456 .ctl_name = FS_DIR_NOTIFY,
1457 .procname = "dir-notify-enable",
1458 .data = &dir_notify_enable,
1459 .maxlen = sizeof(int),
1460 .mode = 0644,
1461 .proc_handler = &proc_dointvec,
1462 },
1463#endif
1464#ifdef CONFIG_MMU
bfcd17a6 1465#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1466 {
1467 .ctl_name = FS_LEASE_TIME,
1468 .procname = "lease-break-time",
1469 .data = &lease_break_time,
1470 .maxlen = sizeof(int),
1471 .mode = 0644,
8e654fba 1472 .proc_handler = &proc_dointvec,
1da177e4 1473 },
bfcd17a6 1474#endif
ebf3f09c 1475#ifdef CONFIG_AIO
1da177e4 1476 {
1da177e4
LT		 1477 .procname = "aio-nr",
1478 .data = &aio_nr,
1479 .maxlen = sizeof(aio_nr),
1480 .mode = 0444,
d55b5fda 1481 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1482 },
1483 {
1da177e4
LT		 1484 .procname = "aio-max-nr",
1485 .data = &aio_max_nr,
1486 .maxlen = sizeof(aio_max_nr),
1487 .mode = 0644,
d55b5fda 1488 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1489 },
ebf3f09c 1490#endif /* CONFIG_AIO */
2d9048e2 1491#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1492 {
1493 .ctl_name = FS_INOTIFY,
1494 .procname = "inotify",
1495 .mode = 0555,
1496 .child = inotify_table,
1497 },
1498#endif
7ef9964e
DL		 1499#ifdef CONFIG_EPOLL
1500 {
1501 .procname = "epoll",
1502 .mode = 0555,
1503 .child = epoll_table,
1504 },
1505#endif
1da177e4 1506#endif
d6e71144
AC		 1507 {
1508 .ctl_name = KERN_SETUID_DUMPABLE,
1509 .procname = "suid_dumpable",
1510 .data = &suid_dumpable,
1511 .maxlen = sizeof(int),
1512 .mode = 0644,
8e654fba
MW		 1513 .proc_handler = &proc_dointvec_minmax,
1514 .strategy = &sysctl_intvec,
1515 .extra1 = &zero,
1516 .extra2 = &two,
d6e71144 1517 },
2abc26fc
EB		 1518#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1519 {
1520 .ctl_name = CTL_UNNUMBERED,
1521 .procname = "binfmt_misc",
1522 .mode = 0555,
1523 .child = binfmt_misc_table,
1524 },
1525#endif
2be7fe07
AM		 1526/*
1527 * NOTE: do not add new entries to this table unless you have read
1528 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1529 */
1da177e4
LT		 1530 { .ctl_name = 0 }
1531};
1532
d8217f07 1533static struct ctl_table debug_table[] = {
d0c3d534 1534#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1535 {
1536 .ctl_name = CTL_UNNUMBERED,
1537 .procname = "exception-trace",
1538 .data = &show_unhandled_signals,
1539 .maxlen = sizeof(int),
1540 .mode = 0644,
1541 .proc_handler = proc_dointvec
1542 },
1543#endif
1da177e4
LT		 1544 { .ctl_name = 0 }
1545};
1546
d8217f07 1547static struct ctl_table dev_table[] = {
1da177e4 1548 { .ctl_name = 0 }
0eeca283 1549};
1da177e4 1550
330d57fb
AV		 1551static DEFINE_SPINLOCK(sysctl_lock);
1552
1553/* called under sysctl_lock */
1554static int use_table(struct ctl_table_header *p)
1555{
1556 if (unlikely(p->unregistering))
1557 return 0;
1558 p->used++;
1559 return 1;
1560}
1561
1562/* called under sysctl_lock */
1563static void unuse_table(struct ctl_table_header *p)
1564{
1565 if (!--p->used)
1566 if (unlikely(p->unregistering))
1567 complete(p->unregistering);
1568}
1569
1570/* called under sysctl_lock, will reacquire if has to wait */
1571static void start_unregistering(struct ctl_table_header *p)
1572{
1573 /*
1574 * if p->used is 0, nobody will ever touch that entry again;
1575 * we'll eliminate all paths to it before dropping sysctl_lock
1576 */
1577 if (unlikely(p->used)) {
1578 struct completion wait;
1579 init_completion(&wait);
1580 p->unregistering = &wait;
1581 spin_unlock(&sysctl_lock);
1582 wait_for_completion(&wait);
1583 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1584 } else {
1585 /* anything non-NULL; we'll never dereference it */
1586 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1587 }
1588 /*
1589 * do not remove from the list until nobody holds it; walking the
1590 * list in do_sysctl() relies on that.
1591 */
1592 list_del_init(&p->ctl_entry);
1593}
1594
f7e6ced4
AV		 1595void sysctl_head_get(struct ctl_table_header *head)
1596{
1597 spin_lock(&sysctl_lock);
1598 head->count++;
1599 spin_unlock(&sysctl_lock);
1600}
1601
1602void sysctl_head_put(struct ctl_table_header *head)
1603{
1604 spin_lock(&sysctl_lock);
1605 if (!--head->count)
1606 kfree(head);
1607 spin_unlock(&sysctl_lock);
1608}
1609
1610struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1611{
1612 if (!head)
1613 BUG();
1614 spin_lock(&sysctl_lock);
1615 if (!use_table(head))
1616 head = ERR_PTR(-ENOENT);
1617 spin_unlock(&sysctl_lock);
1618 return head;
1619}
1620
805b5d5e
EB		 1621void sysctl_head_finish(struct ctl_table_header *head)
1622{
1623 if (!head)
1624 return;
1625 spin_lock(&sysctl_lock);
1626 unuse_table(head);
1627 spin_unlock(&sysctl_lock);
1628}
1629
73455092
AV		 1630static struct ctl_table_set *
1631lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1632{
1633 struct ctl_table_set *set = &root->default_set;
1634 if (root->lookup)
1635 set = root->lookup(root, namespaces);
1636 return set;
1637}
1638
e51b6ba0
EB		 1639static struct list_head *
1640lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1641{
73455092
AV		 1642 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1643 return &set->list;
e51b6ba0
EB		 1644}
1645
1646struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1647 struct ctl_table_header *prev)
1648{
1649 struct ctl_table_root *root;
1650 struct list_head *header_list;
805b5d5e
EB		 1651 struct ctl_table_header *head;
1652 struct list_head *tmp;
e51b6ba0 1653
805b5d5e
EB		 1654 spin_lock(&sysctl_lock);
1655 if (prev) {
e51b6ba0 1656 head = prev;
805b5d5e
EB		 1657 tmp = &prev->ctl_entry;
1658 unuse_table(prev);
1659 goto next;
1660 }
1661 tmp = &root_table_header.ctl_entry;
1662 for (;;) {
1663 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1664
1665 if (!use_table(head))
1666 goto next;
1667 spin_unlock(&sysctl_lock);
1668 return head;
1669 next:
e51b6ba0 1670 root = head->root;
805b5d5e 1671 tmp = tmp->next;
e51b6ba0
EB		 1672 header_list = lookup_header_list(root, namespaces);
1673 if (tmp != header_list)
1674 continue;
1675
1676 do {
1677 root = list_entry(root->root_list.next,
1678 struct ctl_table_root, root_list);
1679 if (root == &sysctl_table_root)
1680 goto out;
1681 header_list = lookup_header_list(root, namespaces);
1682 } while (list_empty(header_list));
1683 tmp = header_list->next;
805b5d5e 1684 }
e51b6ba0 1685out:
805b5d5e
EB		 1686 spin_unlock(&sysctl_lock);
1687 return NULL;
1688}
1689
e51b6ba0
EB		 1690struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1691{
1692 return __sysctl_head_next(current->nsproxy, prev);
1693}
1694
1695void register_sysctl_root(struct ctl_table_root *root)
1696{
1697 spin_lock(&sysctl_lock);
1698 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1699 spin_unlock(&sysctl_lock);
1700}
1701
b89a8171 1702#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1703/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1704static int do_sysctl_strategy(struct ctl_table_root *root,
1705 struct ctl_table *table,
2c4c7155
PE		 1706 void __user *oldval, size_t __user *oldlenp,
1707 void __user *newval, size_t newlen)
1708{
1709 int op = 0, rc;
1710
1711 if (oldval)
e6305c43 1712 op |= MAY_READ;
2c4c7155 1713 if (newval)
e6305c43 1714 op |= MAY_WRITE;
d7321cd6 1715 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1716 return -EPERM;
1717
1718 if (table->strategy) {
f221e726 1719 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1720 if (rc < 0)
1721 return rc;
1722 if (rc > 0)
1723 return 0;
1724 }
1725
1726 /* If there is no strategy routine, or if the strategy returns
1727 * zero, proceed with automatic r/w */
1728 if (table->data && table->maxlen) {
f221e726 1729 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1730 if (rc < 0)
1731 return rc;
1732 }
1733 return 0;
1734}
1735
1736static int parse_table(int __user *name, int nlen,
1737 void __user *oldval, size_t __user *oldlenp,
1738 void __user *newval, size_t newlen,
d7321cd6 1739 struct ctl_table_root *root,
2c4c7155
PE		 1740 struct ctl_table *table)
1741{
1742 int n;
1743repeat:
1744 if (!nlen)
1745 return -ENOTDIR;
1746 if (get_user(n, name))
1747 return -EFAULT;
1748 for ( ; table->ctl_name || table->procname; table++) {
1749 if (!table->ctl_name)
1750 continue;
1751 if (n == table->ctl_name) {
1752 int error;
1753 if (table->child) {
e6305c43 1754 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1755 return -EPERM;
1756 name++;
1757 nlen--;
1758 table = table->child;
1759 goto repeat;
1760 }
f221e726 1761 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1762 oldval, oldlenp,
1763 newval, newlen);
1764 return error;
1765 }
1766 }
1767 return -ENOTDIR;
1768}
1769
1da177e4
LT		 1770int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1771 void __user *newval, size_t newlen)
1772{
805b5d5e 1773 struct ctl_table_header *head;
330d57fb 1774 int error = -ENOTDIR;
1da177e4
LT		 1775
1776 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1777 return -ENOTDIR;
1778 if (oldval) {
1779 int old_len;
1780 if (!oldlenp || get_user(old_len, oldlenp))
1781 return -EFAULT;
1782 }
330d57fb 1783
805b5d5e
EB		 1784 for (head = sysctl_head_next(NULL); head;
1785 head = sysctl_head_next(head)) {
330d57fb 1786 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1787 newval, newlen,
1788 head->root, head->ctl_table);
805b5d5e
EB		 1789 if (error != -ENOTDIR) {
1790 sysctl_head_finish(head);
330d57fb 1791 break;
805b5d5e
EB		 1792 }
1793 }
330d57fb 1794 return error;
1da177e4
LT		 1795}
1796
1e7bfb21 1797SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1798{
1799 struct __sysctl_args tmp;
1800 int error;
1801
1802 if (copy_from_user(&tmp, args, sizeof(tmp)))
1803 return -EFAULT;
1804
7058cb02
EB		 1805 error = deprecated_sysctl_warning(&tmp);
1806 if (error)
1807 goto out;
1808
1da177e4
LT		 1809 lock_kernel();
1810 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1811 tmp.newval, tmp.newlen);
1812 unlock_kernel();
7058cb02 1813out:
1da177e4
LT		 1814 return error;
1815}
b89a8171 1816#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1817
1818/*
1ff007eb 1819 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1820 * some sysctl variables are readonly even to root.
1821 */
1822
1823static int test_perm(int mode, int op)
1824{
76aac0e9 1825 if (!current_euid())
1da177e4
LT		 1826 mode >>= 6;
1827 else if (in_egroup_p(0))
1828 mode >>= 3;
e6305c43 1829 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1830 return 0;
1831 return -EACCES;
1832}
1833
d7321cd6 1834int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1835{
1836 int error;
d7321cd6
PE		 1837 int mode;
1838
e6305c43 1839 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1840 if (error)
1841 return error;
d7321cd6
PE		 1842
1843 if (root->permissions)
1844 mode = root->permissions(root, current->nsproxy, table);
1845 else
1846 mode = table->mode;
1847
1848 return test_perm(mode, op);
1da177e4
LT		 1849}
1850
d912b0cc
EB		 1851static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1852{
1853 for (; table->ctl_name || table->procname; table++) {
1854 table->parent = parent;
1855 if (table->child)
1856 sysctl_set_parent(table, table->child);
1857 }
1858}
1859
1860static __init int sysctl_init(void)
1861{
1862 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1863#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1864 {
1865 int err;
1866 err = sysctl_check_table(current->nsproxy, root_table);
1867 }
1868#endif
d912b0cc
EB		 1869 return 0;
1870}
1871
1872core_initcall(sysctl_init);
1873
bfbcf034
AV		 1874static struct ctl_table *is_branch_in(struct ctl_table *branch,
1875 struct ctl_table *table)
ae7edecc
AV		 1876{
1877 struct ctl_table *p;
1878 const char *s = branch->procname;
1879
1880 /* branch should have named subdirectory as its first element */
1881 if (!s || !branch->child)
bfbcf034 1882 return NULL;
ae7edecc
AV		 1883
1884 /* ... and nothing else */
1885 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1886 return NULL;
ae7edecc
AV		 1887
1888 /* table should contain subdirectory with the same name */
1889 for (p = table; p->procname || p->ctl_name; p++) {
1890 if (!p->child)
1891 continue;
1892 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1893 return p;
ae7edecc 1894 }
bfbcf034 1895 return NULL;
ae7edecc
AV		 1896}
1897
1898/* see if attaching q to p would be an improvement */
1899static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1900{
1901 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1902 struct ctl_table *next;
ae7edecc
AV		 1903 int is_better = 0;
1904 int not_in_parent = !p->attached_by;
1905
bfbcf034 1906 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1907 if (by == q->attached_by)
1908 is_better = 1;
1909 if (to == p->attached_by)
1910 not_in_parent = 1;
1911 by = by->child;
bfbcf034 1912 to = next->child;
ae7edecc
AV		 1913 }
1914
1915 if (is_better && not_in_parent) {
1916 q->attached_by = by;
1917 q->attached_to = to;
1918 q->parent = p;
1919 }
1920}
1921
1da177e4 1922/**
e51b6ba0
EB		 1923 * __register_sysctl_paths - register a sysctl hierarchy
1924 * @root: List of sysctl headers to register on
1925 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1926 * @path: The path to the directory the sysctl table is in.
1da177e4 1927 * @table: the top-level table structure
1da177e4
LT		 1928 *
1929 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1930 * array. A completely 0 filled entry terminates the table.
1da177e4 1931 *
d8217f07 1932 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1933 *
1934 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1935 * must be unique within that level of sysctl
1936 *
1937 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1938 * enter a sysctl file
1939 *
1940 * data - a pointer to data for use by proc_handler
1941 *
1942 * maxlen - the maximum size in bytes of the data
1943 *
1944 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1945 *
1946 * child - a pointer to the child sysctl table if this entry is a directory, or
1947 * %NULL.
1948 *
1949 * proc_handler - the text handler routine (described below)
1950 *
1951 * strategy - the strategy routine (described below)
1952 *
1953 * de - for internal use by the sysctl routines
1954 *
1955 * extra1, extra2 - extra pointers usable by the proc handler routines
1956 *
1957 * Leaf nodes in the sysctl tree will be represented by a single file
1958 * under /proc; non-leaf nodes will be represented by directories.
1959 *
1960 * sysctl(2) can automatically manage read and write requests through
1961 * the sysctl table. The data and maxlen fields of the ctl_table
1962 * struct enable minimal validation of the values being written to be
1963 * performed, and the mode field allows minimal authentication.
1964 *
1965 * More sophisticated management can be enabled by the provision of a
1966 * strategy routine with the table entry. This will be called before
1967 * any automatic read or write of the data is performed.
1968 *
1969 * The strategy routine may return
1970 *
1971 * < 0 - Error occurred (error is passed to user process)
1972 *
1973 * 0 - OK - proceed with automatic read or write.
1974 *
1975 * > 0 - OK - read or write has been done by the strategy routine, so
1976 * return immediately.
1977 *
1978 * There must be a proc_handler routine for any terminal nodes
1979 * mirrored under /proc/sys (non-terminals are handled by a built-in
1980 * directory handler). Several default handlers are available to
1981 * cover common cases -
1982 *
1983 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1984 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1985 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1986 *
1987 * It is the handler's job to read the input buffer from user memory
1988 * and process it. The handler should return 0 on success.
1989 *
1990 * This routine returns %NULL on a failure to register, and a pointer
1991 * to the table header on success.
1992 */
e51b6ba0
EB		 1993struct ctl_table_header *__register_sysctl_paths(
1994 struct ctl_table_root *root,
1995 struct nsproxy *namespaces,
1996 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1997{
29e796fd
EB		 1998 struct ctl_table_header *header;
1999 struct ctl_table *new, **prevp;
2000 unsigned int n, npath;
ae7edecc 2001 struct ctl_table_set *set;
29e796fd
EB		 2002
2003 /* Count the path components */
2004 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2005 ;
2006
2007 /*
2008 * For each path component, allocate a 2-element ctl_table array.
2009 * The first array element will be filled with the sysctl entry
2010 * for this, the second will be the sentinel (ctl_name == 0).
2011 *
2012 * We allocate everything in one go so that we don't have to
2013 * worry about freeing additional memory in unregister_sysctl_table.
2014 */
2015 header = kzalloc(sizeof(struct ctl_table_header) +
2016 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2017 if (!header)
1da177e4 2018 return NULL;
29e796fd
EB		 2019
2020 new = (struct ctl_table *) (header + 1);
2021
2022 /* Now connect the dots */
2023 prevp = &header->ctl_table;
2024 for (n = 0; n < npath; ++n, ++path) {
2025 /* Copy the procname */
2026 new->procname = path->procname;
2027 new->ctl_name = path->ctl_name;
2028 new->mode = 0555;
2029
2030 *prevp = new;
2031 prevp = &new->child;
2032
2033 new += 2;
2034 }
2035 *prevp = table;
23eb06de 2036 header->ctl_table_arg = table;
29e796fd
EB		 2037
2038 INIT_LIST_HEAD(&header->ctl_entry);
2039 header->used = 0;
2040 header->unregistering = NULL;
e51b6ba0 2041 header->root = root;
29e796fd 2042 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 2043 header->count = 1;
88f458e4 2044#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 2045 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 2046 kfree(header);
fc6cd25b
EB		 2047 return NULL;
2048 }
88f458e4 2049#endif
330d57fb 2050 spin_lock(&sysctl_lock);
73455092 2051 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 2052 header->attached_by = header->ctl_table;
2053 header->attached_to = root_table;
2054 header->parent = &root_table_header;
2055 for (set = header->set; set; set = set->parent) {
2056 struct ctl_table_header *p;
2057 list_for_each_entry(p, &set->list, ctl_entry) {
2058 if (p->unregistering)
2059 continue;
2060 try_attach(p, header);
2061 }
2062 }
2063 header->parent->count++;
73455092 2064 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 2065 spin_unlock(&sysctl_lock);
29e796fd
EB		 2066
2067 return header;
2068}
2069
e51b6ba0
EB		 2070/**
2071 * register_sysctl_table_path - register a sysctl table hierarchy
2072 * @path: The path to the directory the sysctl table is in.
2073 * @table: the top-level table structure
2074 *
2075 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2076 * array. A completely 0 filled entry terminates the table.
2077 *
2078 * See __register_sysctl_paths for more details.
2079 */
2080struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2081 struct ctl_table *table)
2082{
2083 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2084 path, table);
2085}
2086
29e796fd
EB		 2087/**
2088 * register_sysctl_table - register a sysctl table hierarchy
2089 * @table: the top-level table structure
2090 *
2091 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2092 * array. A completely 0 filled entry terminates the table.
2093 *
2094 * See register_sysctl_paths for more details.
2095 */
2096struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2097{
2098 static const struct ctl_path null_path[] = { {} };
2099
2100 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2101}
2102
2103/**
2104 * unregister_sysctl_table - unregister a sysctl table hierarchy
2105 * @header: the header returned from register_sysctl_table
2106 *
2107 * Unregisters the sysctl table and all children. proc entries may not
2108 * actually be removed until they are no longer used by anyone.
2109 */
2110void unregister_sysctl_table(struct ctl_table_header * header)
2111{
330d57fb 2112 might_sleep();
f1dad166
PE		 2113
2114 if (header == NULL)
2115 return;
2116
330d57fb
AV		 2117 spin_lock(&sysctl_lock);
2118 start_unregistering(header);
ae7edecc
AV		 2119 if (!--header->parent->count) {
2120 WARN_ON(1);
2121 kfree(header->parent);
2122 }
f7e6ced4
AV		 2123 if (!--header->count)
2124 kfree(header);
330d57fb 2125 spin_unlock(&sysctl_lock);
1da177e4
LT		 2126}
2127
9043476f
AV		 2128int sysctl_is_seen(struct ctl_table_header *p)
2129{
2130 struct ctl_table_set *set = p->set;
2131 int res;
2132 spin_lock(&sysctl_lock);
2133 if (p->unregistering)
2134 res = 0;
2135 else if (!set->is_seen)
2136 res = 1;
2137 else
2138 res = set->is_seen(set);
2139 spin_unlock(&sysctl_lock);
2140 return res;
2141}
2142
73455092
AV		 2143void setup_sysctl_set(struct ctl_table_set *p,
2144 struct ctl_table_set *parent,
2145 int (*is_seen)(struct ctl_table_set *))
2146{
2147 INIT_LIST_HEAD(&p->list);
2148 p->parent = parent ? parent : &sysctl_table_root.default_set;
2149 p->is_seen = is_seen;
2150}
2151
b89a8171 2152#else /* !CONFIG_SYSCTL */
d8217f07 2153struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2154{
2155 return NULL;
2156}
2157
29e796fd
EB		 2158struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2159 struct ctl_table *table)
2160{
2161 return NULL;
2162}
2163
b89a8171
EB		 2164void unregister_sysctl_table(struct ctl_table_header * table)
2165{
2166}
2167
73455092
AV		 2168void setup_sysctl_set(struct ctl_table_set *p,
2169 struct ctl_table_set *parent,
2170 int (*is_seen)(struct ctl_table_set *))
2171{
2172}
2173
f7e6ced4
AV		 2174void sysctl_head_put(struct ctl_table_header *head)
2175{
2176}
2177
b89a8171
EB		 2178#endif /* CONFIG_SYSCTL */
2179
1da177e4
LT		 2180/*
2181 * /proc/sys support
2182 */
2183
b89a8171 2184#ifdef CONFIG_PROC_SYSCTL
1da177e4 2185
b1ba4ddd
AB		 2186static int _proc_do_string(void* data, int maxlen, int write,
2187 struct file *filp, void __user *buffer,
2188 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2189{
2190 size_t len;
2191 char __user *p;
2192 char c;
8d060877
ON		 2193
2194 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2195 *lenp = 0;
2196 return 0;
2197 }
8d060877 2198
1da177e4
LT		 2199 if (write) {
2200 len = 0;
2201 p = buffer;
2202 while (len < *lenp) {
2203 if (get_user(c, p++))
2204 return -EFAULT;
2205 if (c == 0 || c == '\n')
2206 break;
2207 len++;
2208 }
f5dd3d6f
SV		 2209 if (len >= maxlen)
2210 len = maxlen-1;
2211 if(copy_from_user(data, buffer, len))
1da177e4 2212 return -EFAULT;
f5dd3d6f 2213 ((char *) data)[len] = 0;
1da177e4
LT		 2214 *ppos += *lenp;
2215 } else {
f5dd3d6f
SV		 2216 len = strlen(data);
2217 if (len > maxlen)
2218 len = maxlen;
8d060877
ON		 2219
2220 if (*ppos > len) {
2221 *lenp = 0;
2222 return 0;
2223 }
2224
2225 data += *ppos;
2226 len -= *ppos;
2227
1da177e4
LT		 2228 if (len > *lenp)
2229 len = *lenp;
2230 if (len)
f5dd3d6f 2231 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2232 return -EFAULT;
2233 if (len < *lenp) {
2234 if(put_user('\n', ((char __user *) buffer) + len))
2235 return -EFAULT;
2236 len++;
2237 }
2238 *lenp = len;
2239 *ppos += len;
2240 }
2241 return 0;
2242}
2243
f5dd3d6f
SV		 2244/**
2245 * proc_dostring - read a string sysctl
2246 * @table: the sysctl table
2247 * @write: %TRUE if this is a write to the sysctl file
2248 * @filp: the file structure
2249 * @buffer: the user buffer
2250 * @lenp: the size of the user buffer
2251 * @ppos: file position
2252 *
2253 * Reads/writes a string from/to the user buffer. If the kernel
2254 * buffer provided is not large enough to hold the string, the
2255 * string is truncated. The copied string is %NULL-terminated.
2256 * If the string is being read by the user process, it is copied
2257 * and a newline '\n' is added. It is truncated if the buffer is
2258 * not large enough.
2259 *
2260 * Returns 0 on success.
2261 */
d8217f07 2262int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2263 void __user *buffer, size_t *lenp, loff_t *ppos)
2264{
2265 return _proc_do_string(table->data, table->maxlen, write, filp,
2266 buffer, lenp, ppos);
2267}
2268
1da177e4
LT		 2269
2270static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2271 int *valp,
2272 int write, void *data)
2273{
2274 if (write) {
2275 *valp = *negp ? -*lvalp : *lvalp;
2276 } else {
2277 int val = *valp;
2278 if (val < 0) {
2279 *negp = -1;
2280 *lvalp = (unsigned long)-val;
2281 } else {
2282 *negp = 0;
2283 *lvalp = (unsigned long)val;
2284 }
2285 }
2286 return 0;
2287}
2288
d8217f07 2289static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2290 int write, struct file *filp, void __user *buffer,
2291 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2292 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2293 int write, void *data),
2294 void *data)
2295{
2296#define TMPBUFLEN 21
7338f299 2297 int *i, vleft, first = 1, neg;
1da177e4
LT		 2298 unsigned long lval;
2299 size_t left, len;
2300
2301 char buf[TMPBUFLEN], *p;
2302 char __user *s = buffer;
2303
fcfbd547 2304 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2305 (*ppos && !write)) {
2306 *lenp = 0;
2307 return 0;
2308 }
2309
fcfbd547 2310 i = (int *) tbl_data;
1da177e4
LT		 2311 vleft = table->maxlen / sizeof(*i);
2312 left = *lenp;
2313
2314 if (!conv)
2315 conv = do_proc_dointvec_conv;
2316
2317 for (; left && vleft--; i++, first=0) {
2318 if (write) {
2319 while (left) {
2320 char c;
2321 if (get_user(c, s))
2322 return -EFAULT;
2323 if (!isspace(c))
2324 break;
2325 left--;
2326 s++;
2327 }
2328 if (!left)
2329 break;
2330 neg = 0;
2331 len = left;
2332 if (len > sizeof(buf) - 1)
2333 len = sizeof(buf) - 1;
2334 if (copy_from_user(buf, s, len))
2335 return -EFAULT;
2336 buf[len] = 0;
2337 p = buf;
2338 if (*p == '-' && left > 1) {
2339 neg = 1;
bd9b0bac 2340 p++;
1da177e4
LT		 2341 }
2342 if (*p < '0' || *p > '9')
2343 break;
2344
2345 lval = simple_strtoul(p, &p, 0);
2346
2347 len = p-buf;
2348 if ((len < left) && *p && !isspace(*p))
2349 break;
1da177e4
LT		 2350 s += len;
2351 left -= len;
2352
2353 if (conv(&neg, &lval, i, 1, data))
2354 break;
2355 } else {
2356 p = buf;
2357 if (!first)
2358 *p++ = '\t';
2359
2360 if (conv(&neg, &lval, i, 0, data))
2361 break;
2362
2363 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2364 len = strlen(buf);
2365 if (len > left)
2366 len = left;
2367 if(copy_to_user(s, buf, len))
2368 return -EFAULT;
2369 left -= len;
2370 s += len;
2371 }
2372 }
2373
2374 if (!write && !first && left) {
2375 if(put_user('\n', s))
2376 return -EFAULT;
2377 left--, s++;
2378 }
2379 if (write) {
2380 while (left) {
2381 char c;
2382 if (get_user(c, s++))
2383 return -EFAULT;
2384 if (!isspace(c))
2385 break;
2386 left--;
2387 }
2388 }
2389 if (write && first)
2390 return -EINVAL;
2391 *lenp -= left;
2392 *ppos += *lenp;
2393 return 0;
2394#undef TMPBUFLEN
2395}
2396
d8217f07 2397static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2398 void __user *buffer, size_t *lenp, loff_t *ppos,
2399 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2400 int write, void *data),
2401 void *data)
2402{
2403 return __do_proc_dointvec(table->data, table, write, filp,
2404 buffer, lenp, ppos, conv, data);
2405}
2406
1da177e4
LT		 2407/**
2408 * proc_dointvec - read a vector of integers
2409 * @table: the sysctl table
2410 * @write: %TRUE if this is a write to the sysctl file
2411 * @filp: the file structure
2412 * @buffer: the user buffer
2413 * @lenp: the size of the user buffer
2414 * @ppos: file position
2415 *
2416 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2417 * values from/to the user buffer, treated as an ASCII string.
2418 *
2419 * Returns 0 on success.
2420 */
d8217f07 2421int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2422 void __user *buffer, size_t *lenp, loff_t *ppos)
2423{
2424 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2425 NULL,NULL);
2426}
2427
34f5a398 2428/*
25ddbb18
AK		 2429 * Taint values can only be increased
2430 * This means we can safely use a temporary.
34f5a398 2431 */
25ddbb18 2432static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2433 void __user *buffer, size_t *lenp, loff_t *ppos)
2434{
25ddbb18
AK		 2435 struct ctl_table t;
2436 unsigned long tmptaint = get_taint();
2437 int err;
34f5a398 2438
91fcd412 2439 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2440 return -EPERM;
2441
25ddbb18
AK		 2442 t = *table;
2443 t.data = &tmptaint;
2444 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2445 if (err < 0)
2446 return err;
2447
2448 if (write) {
2449 /*
2450 * Poor man's atomic or. Not worth adding a primitive
2451 * to everyone's atomic.h for this
2452 */
2453 int i;
2454 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2455 if ((tmptaint >> i) & 1)
2456 add_taint(i);
2457 }
2458 }
2459
2460 return err;
34f5a398
TT		 2461}
2462
1da177e4
LT		 2463struct do_proc_dointvec_minmax_conv_param {
2464 int *min;
2465 int *max;
2466};
2467
2468static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2469 int *valp,
2470 int write, void *data)
2471{
2472 struct do_proc_dointvec_minmax_conv_param *param = data;
2473 if (write) {
2474 int val = *negp ? -*lvalp : *lvalp;
2475 if ((param->min && *param->min > val) ||
2476 (param->max && *param->max < val))
2477 return -EINVAL;
2478 *valp = val;
2479 } else {
2480 int val = *valp;
2481 if (val < 0) {
2482 *negp = -1;
2483 *lvalp = (unsigned long)-val;
2484 } else {
2485 *negp = 0;
2486 *lvalp = (unsigned long)val;
2487 }
2488 }
2489 return 0;
2490}
2491
2492/**
2493 * proc_dointvec_minmax - read a vector of integers with min/max values
2494 * @table: the sysctl table
2495 * @write: %TRUE if this is a write to the sysctl file
2496 * @filp: the file structure
2497 * @buffer: the user buffer
2498 * @lenp: the size of the user buffer
2499 * @ppos: file position
2500 *
2501 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2502 * values from/to the user buffer, treated as an ASCII string.
2503 *
2504 * This routine will ensure the values are within the range specified by
2505 * table->extra1 (min) and table->extra2 (max).
2506 *
2507 * Returns 0 on success.
2508 */
d8217f07 2509int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2510 void __user *buffer, size_t *lenp, loff_t *ppos)
2511{
2512 struct do_proc_dointvec_minmax_conv_param param = {
2513 .min = (int *) table->extra1,
2514 .max = (int *) table->extra2,
2515 };
2516 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2517 do_proc_dointvec_minmax_conv, &param);
2518}
2519
d8217f07 2520static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2521 struct file *filp,
2522 void __user *buffer,
2523 size_t *lenp, loff_t *ppos,
2524 unsigned long convmul,
2525 unsigned long convdiv)
2526{
2527#define TMPBUFLEN 21
2528 unsigned long *i, *min, *max, val;
2529 int vleft, first=1, neg;
2530 size_t len, left;
2531 char buf[TMPBUFLEN], *p;
2532 char __user *s = buffer;
2533
fcfbd547 2534 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2535 (*ppos && !write)) {
2536 *lenp = 0;
2537 return 0;
2538 }
2539
fcfbd547 2540 i = (unsigned long *) data;
1da177e4
LT		 2541 min = (unsigned long *) table->extra1;
2542 max = (unsigned long *) table->extra2;
2543 vleft = table->maxlen / sizeof(unsigned long);
2544 left = *lenp;
2545
2546 for (; left && vleft--; i++, min++, max++, first=0) {
2547 if (write) {
2548 while (left) {
2549 char c;
2550 if (get_user(c, s))
2551 return -EFAULT;
2552 if (!isspace(c))
2553 break;
2554 left--;
2555 s++;
2556 }
2557 if (!left)
2558 break;
2559 neg = 0;
2560 len = left;
2561 if (len > TMPBUFLEN-1)
2562 len = TMPBUFLEN-1;
2563 if (copy_from_user(buf, s, len))
2564 return -EFAULT;
2565 buf[len] = 0;
2566 p = buf;
2567 if (*p == '-' && left > 1) {
2568 neg = 1;
bd9b0bac 2569 p++;
1da177e4
LT		 2570 }
2571 if (*p < '0' || *p > '9')
2572 break;
2573 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2574 len = p-buf;
2575 if ((len < left) && *p && !isspace(*p))
2576 break;
2577 if (neg)
2578 val = -val;
2579 s += len;
2580 left -= len;
2581
2582 if(neg)
2583 continue;
2584 if ((min && val < *min) || (max && val > *max))
2585 continue;
2586 *i = val;
2587 } else {
2588 p = buf;
2589 if (!first)
2590 *p++ = '\t';
2591 sprintf(p, "%lu", convdiv * (*i) / convmul);
2592 len = strlen(buf);
2593 if (len > left)
2594 len = left;
2595 if(copy_to_user(s, buf, len))
2596 return -EFAULT;
2597 left -= len;
2598 s += len;
2599 }
2600 }
2601
2602 if (!write && !first && left) {
2603 if(put_user('\n', s))
2604 return -EFAULT;
2605 left--, s++;
2606 }
2607 if (write) {
2608 while (left) {
2609 char c;
2610 if (get_user(c, s++))
2611 return -EFAULT;
2612 if (!isspace(c))
2613 break;
2614 left--;
2615 }
2616 }
2617 if (write && first)
2618 return -EINVAL;
2619 *lenp -= left;
2620 *ppos += *lenp;
2621 return 0;
2622#undef TMPBUFLEN
2623}
2624
d8217f07 2625static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2626 struct file *filp,
2627 void __user *buffer,
2628 size_t *lenp, loff_t *ppos,
2629 unsigned long convmul,
2630 unsigned long convdiv)
2631{
2632 return __do_proc_doulongvec_minmax(table->data, table, write,
2633 filp, buffer, lenp, ppos, convmul, convdiv);
2634}
2635
1da177e4
LT		 2636/**
2637 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2638 * @table: the sysctl table
2639 * @write: %TRUE if this is a write to the sysctl file
2640 * @filp: the file structure
2641 * @buffer: the user buffer
2642 * @lenp: the size of the user buffer
2643 * @ppos: file position
2644 *
2645 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2646 * values from/to the user buffer, treated as an ASCII string.
2647 *
2648 * This routine will ensure the values are within the range specified by
2649 * table->extra1 (min) and table->extra2 (max).
2650 *
2651 * Returns 0 on success.
2652 */
d8217f07 2653int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2654 void __user *buffer, size_t *lenp, loff_t *ppos)
2655{
2656 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2657}
2658
2659/**
2660 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2661 * @table: the sysctl table
2662 * @write: %TRUE if this is a write to the sysctl file
2663 * @filp: the file structure
2664 * @buffer: the user buffer
2665 * @lenp: the size of the user buffer
2666 * @ppos: file position
2667 *
2668 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2669 * values from/to the user buffer, treated as an ASCII string. The values
2670 * are treated as milliseconds, and converted to jiffies when they are stored.
2671 *
2672 * This routine will ensure the values are within the range specified by
2673 * table->extra1 (min) and table->extra2 (max).
2674 *
2675 * Returns 0 on success.
2676 */
d8217f07 2677int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2678 struct file *filp,
2679 void __user *buffer,
2680 size_t *lenp, loff_t *ppos)
2681{
2682 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2683 lenp, ppos, HZ, 1000l);
2684}
2685
2686
2687static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2688 int *valp,
2689 int write, void *data)
2690{
2691 if (write) {
cba9f33d
BS		 2692 if (*lvalp > LONG_MAX / HZ)
2693 return 1;
1da177e4
LT		 2694 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2695 } else {
2696 int val = *valp;
2697 unsigned long lval;
2698 if (val < 0) {
2699 *negp = -1;
2700 lval = (unsigned long)-val;
2701 } else {
2702 *negp = 0;
2703 lval = (unsigned long)val;
2704 }
2705 *lvalp = lval / HZ;
2706 }
2707 return 0;
2708}
2709
2710static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2711 int *valp,
2712 int write, void *data)
2713{
2714 if (write) {
cba9f33d
BS		 2715 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2716 return 1;
1da177e4
LT		 2717 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2718 } else {
2719 int val = *valp;
2720 unsigned long lval;
2721 if (val < 0) {
2722 *negp = -1;
2723 lval = (unsigned long)-val;
2724 } else {
2725 *negp = 0;
2726 lval = (unsigned long)val;
2727 }
2728 *lvalp = jiffies_to_clock_t(lval);
2729 }
2730 return 0;
2731}
2732
2733static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2734 int *valp,
2735 int write, void *data)
2736{
2737 if (write) {
2738 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2739 } else {
2740 int val = *valp;
2741 unsigned long lval;
2742 if (val < 0) {
2743 *negp = -1;
2744 lval = (unsigned long)-val;
2745 } else {
2746 *negp = 0;
2747 lval = (unsigned long)val;
2748 }
2749 *lvalp = jiffies_to_msecs(lval);
2750 }
2751 return 0;
2752}
2753
2754/**
2755 * proc_dointvec_jiffies - read a vector of integers as seconds
2756 * @table: the sysctl table
2757 * @write: %TRUE if this is a write to the sysctl file
2758 * @filp: the file structure
2759 * @buffer: the user buffer
2760 * @lenp: the size of the user buffer
2761 * @ppos: file position
2762 *
2763 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2764 * values from/to the user buffer, treated as an ASCII string.
2765 * The values read are assumed to be in seconds, and are converted into
2766 * jiffies.
2767 *
2768 * Returns 0 on success.
2769 */
d8217f07 2770int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2771 void __user *buffer, size_t *lenp, loff_t *ppos)
2772{
2773 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2774 do_proc_dointvec_jiffies_conv,NULL);
2775}
2776
2777/**
2778 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2779 * @table: the sysctl table
2780 * @write: %TRUE if this is a write to the sysctl file
2781 * @filp: the file structure
2782 * @buffer: the user buffer
2783 * @lenp: the size of the user buffer
1e5d5331 2784 * @ppos: pointer to the file position
1da177e4
LT		 2785 *
2786 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2787 * values from/to the user buffer, treated as an ASCII string.
2788 * The values read are assumed to be in 1/USER_HZ seconds, and
2789 * are converted into jiffies.
2790 *
2791 * Returns 0 on success.
2792 */
d8217f07 2793int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2794 void __user *buffer, size_t *lenp, loff_t *ppos)
2795{
2796 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2797 do_proc_dointvec_userhz_jiffies_conv,NULL);
2798}
2799
2800/**
2801 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2802 * @table: the sysctl table
2803 * @write: %TRUE if this is a write to the sysctl file
2804 * @filp: the file structure
2805 * @buffer: the user buffer
2806 * @lenp: the size of the user buffer
67be2dd1
MW		 2807 * @ppos: file position
2808 * @ppos: the current position in the file
1da177e4
LT		 2809 *
2810 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2811 * values from/to the user buffer, treated as an ASCII string.
2812 * The values read are assumed to be in 1/1000 seconds, and
2813 * are converted into jiffies.
2814 *
2815 * Returns 0 on success.
2816 */
d8217f07 2817int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2818 void __user *buffer, size_t *lenp, loff_t *ppos)
2819{
2820 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2821 do_proc_dointvec_ms_jiffies_conv, NULL);
2822}
2823
d8217f07 2824static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2825 void __user *buffer, size_t *lenp, loff_t *ppos)
2826{
2827 struct pid *new_pid;
2828 pid_t tmp;
2829 int r;
2830
6c5f3e7b 2831 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2832
2833 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2834 lenp, ppos, NULL, NULL);
2835 if (r || !write)
2836 return r;
2837
2838 new_pid = find_get_pid(tmp);
2839 if (!new_pid)
2840 return -ESRCH;
2841
2842 put_pid(xchg(&cad_pid, new_pid));
2843 return 0;
2844}
2845
1da177e4
LT		 2846#else /* CONFIG_PROC_FS */
2847
d8217f07 2848int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2849 void __user *buffer, size_t *lenp, loff_t *ppos)
2850{
2851 return -ENOSYS;
2852}
2853
d8217f07 2854int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2855 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2856{
2857 return -ENOSYS;
2858}
2859
d8217f07 2860int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2861 void __user *buffer, size_t *lenp, loff_t *ppos)
2862{
2863 return -ENOSYS;
2864}
2865
d8217f07 2866int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2867 void __user *buffer, size_t *lenp, loff_t *ppos)
2868{
2869 return -ENOSYS;
2870}
2871
d8217f07 2872int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2873 void __user *buffer, size_t *lenp, loff_t *ppos)
2874{
2875 return -ENOSYS;
2876}
2877
d8217f07 2878int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2879 void __user *buffer, size_t *lenp, loff_t *ppos)
2880{
2881 return -ENOSYS;
2882}
2883
d8217f07 2884int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2885 void __user *buffer, size_t *lenp, loff_t *ppos)
2886{
2887 return -ENOSYS;
2888}
2889
d8217f07 2890int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2891 struct file *filp,
2892 void __user *buffer,
2893 size_t *lenp, loff_t *ppos)
2894{
2895 return -ENOSYS;
2896}
2897
2898
2899#endif /* CONFIG_PROC_FS */
2900
2901
b89a8171 2902#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2903/*
2904 * General sysctl support routines
2905 */
2906
49a0c458 2907/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2908int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2909 void __user *oldval, size_t __user *oldlenp,
2910 void __user *newval, size_t newlen)
2911{
2912 size_t len;
2913
2914 /* Get out of I don't have a variable */
2915 if (!table->data || !table->maxlen)
2916 return -ENOTDIR;
2917
2918 if (oldval && oldlenp) {
2919 if (get_user(len, oldlenp))
2920 return -EFAULT;
2921 if (len) {
2922 if (len > table->maxlen)
2923 len = table->maxlen;
2924 if (copy_to_user(oldval, table->data, len))
2925 return -EFAULT;
2926 if (put_user(len, oldlenp))
2927 return -EFAULT;
2928 }
2929 }
2930
2931 if (newval && newlen) {
2932 if (newlen > table->maxlen)
2933 newlen = table->maxlen;
2934
2935 if (copy_from_user(table->data, newval, newlen))
2936 return -EFAULT;
2937 }
2938 return 1;
2939}
2940
1da177e4 2941/* The generic string strategy routine: */
f221e726 2942int sysctl_string(struct ctl_table *table,
1da177e4 2943 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2944 void __user *newval, size_t newlen)
1da177e4 2945{
1da177e4
LT		 2946 if (!table->data || !table->maxlen)
2947 return -ENOTDIR;
2948
2949 if (oldval && oldlenp) {
de9e007d
LT		 2950 size_t bufsize;
2951 if (get_user(bufsize, oldlenp))
1da177e4 2952 return -EFAULT;
de9e007d
LT		 2953 if (bufsize) {
2954 size_t len = strlen(table->data), copied;
2955
2956 /* This shouldn't trigger for a well-formed sysctl */
2957 if (len > table->maxlen)
1da177e4 2958 len = table->maxlen;
de9e007d
LT		 2959
2960 /* Copy up to a max of bufsize-1 bytes of the string */
2961 copied = (len >= bufsize) ? bufsize - 1 : len;
2962
2963 if (copy_to_user(oldval, table->data, copied) ||
2964 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2965 return -EFAULT;
de9e007d 2966 if (put_user(len, oldlenp))
1da177e4
LT		 2967 return -EFAULT;
2968 }
2969 }
2970 if (newval && newlen) {
de9e007d 2971 size_t len = newlen;
1da177e4
LT		 2972 if (len > table->maxlen)
2973 len = table->maxlen;
2974 if(copy_from_user(table->data, newval, len))
2975 return -EFAULT;
2976 if (len == table->maxlen)
2977 len--;
2978 ((char *) table->data)[len] = 0;
2979 }
82c9df82 2980 return 1;
1da177e4
LT		 2981}
2982
2983/*
2984 * This function makes sure that all of the integers in the vector
2985 * are between the minimum and maximum values given in the arrays
2986 * table->extra1 and table->extra2, respectively.
2987 */
f221e726 2988int sysctl_intvec(struct ctl_table *table,
1da177e4 2989 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2990 void __user *newval, size_t newlen)
1da177e4
LT		 2991{
2992
2993 if (newval && newlen) {
2994 int __user *vec = (int __user *) newval;
2995 int *min = (int *) table->extra1;
2996 int *max = (int *) table->extra2;
2997 size_t length;
2998 int i;
2999
3000 if (newlen % sizeof(int) != 0)
3001 return -EINVAL;
3002
3003 if (!table->extra1 && !table->extra2)
3004 return 0;
3005
3006 if (newlen > table->maxlen)
3007 newlen = table->maxlen;
3008 length = newlen / sizeof(int);
3009
3010 for (i = 0; i < length; i++) {
3011 int value;
3012 if (get_user(value, vec + i))
3013 return -EFAULT;
3014 if (min && value < min[i])
3015 return -EINVAL;
3016 if (max && value > max[i])
3017 return -EINVAL;
3018 }
3019 }
3020 return 0;
3021}
3022
3023/* Strategy function to convert jiffies to seconds */
f221e726 3024int sysctl_jiffies(struct ctl_table *table,
1da177e4 3025 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3026 void __user *newval, size_t newlen)
1da177e4 3027{
3ee75ac3 3028 if (oldval && oldlenp) {
1da177e4 3029 size_t olen;
3ee75ac3
AD		 3030
3031 if (get_user(olen, oldlenp))
3032 return -EFAULT;
3033 if (olen) {
3034 int val;
3035
3036 if (olen < sizeof(int))
3037 return -EINVAL;
3038
3039 val = *(int *)(table->data) / HZ;
3040 if (put_user(val, (int __user *)oldval))
3041 return -EFAULT;
3042 if (put_user(sizeof(int), oldlenp))
1da177e4 3043 return -EFAULT;
1da177e4 3044 }
1da177e4
LT		 3045 }
3046 if (newval && newlen) {
3047 int new;
3048 if (newlen != sizeof(int))
3049 return -EINVAL;
3050 if (get_user(new, (int __user *)newval))
3051 return -EFAULT;
3052 *(int *)(table->data) = new*HZ;
3053 }
3054 return 1;
3055}
3056
3057/* Strategy function to convert jiffies to seconds */
f221e726 3058int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3059 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3060 void __user *newval, size_t newlen)
1da177e4 3061{
3ee75ac3 3062 if (oldval && oldlenp) {
1da177e4 3063 size_t olen;
3ee75ac3
AD		 3064
3065 if (get_user(olen, oldlenp))
3066 return -EFAULT;
3067 if (olen) {
3068 int val;
3069
3070 if (olen < sizeof(int))
3071 return -EINVAL;
3072
3073 val = jiffies_to_msecs(*(int *)(table->data));
3074 if (put_user(val, (int __user *)oldval))
3075 return -EFAULT;
3076 if (put_user(sizeof(int), oldlenp))
1da177e4 3077 return -EFAULT;
1da177e4 3078 }
1da177e4
LT		 3079 }
3080 if (newval && newlen) {
3081 int new;
3082 if (newlen != sizeof(int))
3083 return -EINVAL;
3084 if (get_user(new, (int __user *)newval))
3085 return -EFAULT;
3086 *(int *)(table->data) = msecs_to_jiffies(new);
3087 }
3088 return 1;
3089}
3090
c4b8b769 3091
c4b8b769 3092
b89a8171 3093#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3094
3095
1e7bfb21 3096SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3097{
0e009be8 3098 struct __sysctl_args tmp;
7058cb02 3099 int error;
0e009be8 3100
0e009be8
EB		 3101 if (copy_from_user(&tmp, args, sizeof(tmp)))
3102 return -EFAULT;
0e009be8 3103
7058cb02 3104 error = deprecated_sysctl_warning(&tmp);
b89a8171 3105
7058cb02
EB		 3106 /* If no error reading the parameters then just -ENOSYS ... */
3107 if (!error)
3108 error = -ENOSYS;
3109
3110 return error;
1da177e4
LT		 3111}
3112
f221e726 3113int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3114 void __user *oldval, size_t __user *oldlenp,
3115 void __user *newval, size_t newlen)
3116{
3117 return -ENOSYS;
3118}
3119
f221e726 3120int sysctl_string(struct ctl_table *table,
1da177e4 3121 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3122 void __user *newval, size_t newlen)
1da177e4
LT		 3123{
3124 return -ENOSYS;
3125}
3126
f221e726 3127int sysctl_intvec(struct ctl_table *table,
1da177e4 3128 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3129 void __user *newval, size_t newlen)
1da177e4
LT		 3130{
3131 return -ENOSYS;
3132}
3133
f221e726 3134int sysctl_jiffies(struct ctl_table *table,
1da177e4 3135 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3136 void __user *newval, size_t newlen)
1da177e4
LT		 3137{
3138 return -ENOSYS;
3139}
3140
f221e726 3141int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3142 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3143 void __user *newval, size_t newlen)
1da177e4
LT		 3144{
3145 return -ENOSYS;
3146}
3147
b89a8171 3148#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3149
7058cb02
EB		 3150static int deprecated_sysctl_warning(struct __sysctl_args *args)
3151{
3152 static int msg_count;
3153 int name[CTL_MAXNAME];
3154 int i;
3155
6fc48af8
TH		 3156 /* Check args->nlen. */
3157 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3158 return -ENOTDIR;
3159
7058cb02
EB		 3160 /* Read in the sysctl name for better debug message logging */
3161 for (i = 0; i < args->nlen; i++)
3162 if (get_user(name[i], args->name + i))
3163 return -EFAULT;
3164
3165 /* Ignore accesses to kernel.version */
3166 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3167 return 0;
3168
3169 if (msg_count < 5) {
3170 msg_count++;
3171 printk(KERN_INFO
3172 "warning: process `%s' used the deprecated sysctl "
3173 "system call with ", current->comm);
3174 for (i = 0; i < args->nlen; i++)
3175 printk("%d.", name[i]);
3176 printk("\n");
3177 }
3178 return 0;
3179}
3180
1da177e4
LT		 3181/*
3182 * No sense putting this after each symbol definition, twice,
3183 * exception granted :-)
3184 */
3185EXPORT_SYMBOL(proc_dointvec);
3186EXPORT_SYMBOL(proc_dointvec_jiffies);
3187EXPORT_SYMBOL(proc_dointvec_minmax);
3188EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3189EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3190EXPORT_SYMBOL(proc_dostring);
3191EXPORT_SYMBOL(proc_doulongvec_minmax);
3192EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3193EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3194EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3195EXPORT_SYMBOL(sysctl_intvec);
3196EXPORT_SYMBOL(sysctl_jiffies);
3197EXPORT_SYMBOL(sysctl_ms_jiffies);
3198EXPORT_SYMBOL(sysctl_string);
49a0c458 3199EXPORT_SYMBOL(sysctl_data);
1da177e4 3200EXPORT_SYMBOL(unregister_sysctl_table);
Linux 6.x block layer and io_uring tree(s)