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Merge tag 'armsoc-arm64' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[linux-2.6-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 21#include <linux/module.h>
e2e40f2c 22#include <linux/aio.h>
1da177e4
LT		 23#include <linux/mm.h>
24#include <linux/swap.h>
25#include <linux/slab.h>
26#include <linux/sysctl.h>
5a04cca6 27#include <linux/bitmap.h>
d33ed52d 28#include <linux/signal.h>
455cd5ab 29#include <linux/printk.h>
1da177e4 30#include <linux/proc_fs.h>
72c2d582 31#include <linux/security.h>
1da177e4 32#include <linux/ctype.h>
dfec072e 33#include <linux/kmemcheck.h>
fd4b616b 34#include <linux/kmemleak.h>
62239ac2 35#include <linux/fs.h>
1da177e4
LT		 36#include <linux/init.h>
37#include <linux/kernel.h>
0296b228 38#include <linux/kobject.h>
20380731 39#include <linux/net.h>
1da177e4
LT		 40#include <linux/sysrq.h>
41#include <linux/highuid.h>
42#include <linux/writeback.h>
3fff4c42 43#include <linux/ratelimit.h>
76ab0f53 44#include <linux/compaction.h>
1da177e4 45#include <linux/hugetlb.h>
1da177e4 46#include <linux/initrd.h>
0b77f5bf 47#include <linux/key.h>
1da177e4
LT		 48#include <linux/times.h>
49#include <linux/limits.h>
50#include <linux/dcache.h>
6e006701 51#include <linux/dnotify.h>
1da177e4 52#include <linux/syscalls.h>
c748e134 53#include <linux/vmstat.h>
c255d844
PM		 54#include <linux/nfs_fs.h>
55#include <linux/acpi.h>
10a0a8d4 56#include <linux/reboot.h>
b0fc494f 57#include <linux/ftrace.h>
cdd6c482 58#include <linux/perf_event.h>
b2be84df 59#include <linux/kprobes.h>
b492e95b 60#include <linux/pipe_fs_i.h>
8e4228e1 61#include <linux/oom.h>
17f60a7d 62#include <linux/kmod.h>
73efc039 63#include <linux/capability.h>
40401530 64#include <linux/binfmts.h>
cf4aebc2 65#include <linux/sched/sysctl.h>
7984754b 66#include <linux/kexec.h>
1be7f75d 67#include <linux/bpf.h>
d2921684 68#include <linux/mount.h>
1da177e4
LT		 69
70#include <asm/uaccess.h>
71#include <asm/processor.h>
72
29cbc78b
AK		 73#ifdef CONFIG_X86
74#include <asm/nmi.h>
0741f4d2 75#include <asm/stacktrace.h>
6e7c4025 76#include <asm/io.h>
29cbc78b 77#endif
d550bbd4
DH		 78#ifdef CONFIG_SPARC
79#include <asm/setup.h>
80#endif
c55b7c3e
DY		 81#ifdef CONFIG_BSD_PROCESS_ACCT
82#include <linux/acct.h>
83#endif
4f0e056f
DY		 84#ifdef CONFIG_RT_MUTEXES
85#include <linux/rtmutex.h>
86#endif
2edf5e49
DY		 87#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88#include <linux/lockdep.h>
89#endif
15485a46
DY		 90#ifdef CONFIG_CHR_DEV_SG
91#include <scsi/sg.h>
92#endif
29cbc78b 93
58687acb 94#ifdef CONFIG_LOCKUP_DETECTOR
504d7cf1
DZ		 95#include <linux/nmi.h>
96#endif
97
1da177e4
LT		 98#if defined(CONFIG_SYSCTL)
99
100/* External variables not in a header file. */
d6e71144 101extern int suid_dumpable;
046d662f
AK		 102#ifdef CONFIG_COREDUMP
103extern int core_uses_pid;
1da177e4 104extern char core_pattern[];
a293980c 105extern unsigned int core_pipe_limit;
046d662f 106#endif
1da177e4 107extern int pid_max;
1da177e4 108extern int pid_max_min, pid_max_max;
8ad4b1fb 109extern int percpu_pagelist_fraction;
bebfa101 110extern int compat_log;
9745512c 111extern int latencytop_enabled;
eceea0b3 112extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 113#ifndef CONFIG_MMU
114extern int sysctl_nr_trim_pages;
115#endif
1da177e4 116
c4f3b63f 117/* Constants used for minimum and maximum */
2508ce18 118#ifdef CONFIG_LOCKUP_DETECTOR
c4f3b63f
RT		 119static int sixty = 60;
120#endif
121
270750db
AT		 122static int __maybe_unused neg_one = -1;
123
c4f3b63f 124static int zero;
cd5f9a4c
LT		 125static int __maybe_unused one = 1;
126static int __maybe_unused two = 2;
5509a5d2 127static int __maybe_unused four = 4;
fc3501d4 128static unsigned long one_ul = 1;
c4f3b63f 129static int one_hundred = 100;
795ae7a0 130static int one_thousand = 1000;
af91322e
DY		 131#ifdef CONFIG_PRINTK
132static int ten_thousand = 10000;
133#endif
c5dfd78e
ACM		 134#ifdef CONFIG_PERF_EVENTS
135static int six_hundred_forty_kb = 640 * 1024;
136#endif
c4f3b63f 137
9e4a5bda
AR		 138/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
1da177e4
LT		 141/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142static int maxolduid = 65535;
143static int minolduid;
144
145static int ngroups_max = NGROUPS_MAX;
73efc039 146static const int cap_last_cap = CAP_LAST_CAP;
1da177e4 147
80df2847
LH		 148/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149#ifdef CONFIG_DETECT_HUNG_TASK
150static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
151#endif
152
d14f1729
DY		 153#ifdef CONFIG_INOTIFY_USER
154#include <linux/inotify.h>
155#endif
72c57ed5 156#ifdef CONFIG_SPARC
1da177e4
LT		 157#endif
158
159#ifdef __hppa__
160extern int pwrsw_enabled;
bf14e3b9
VG		 161#endif
162
163#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4
LT		 164extern int unaligned_enabled;
165#endif
1da177e4 166
d2b176ed 167#ifdef CONFIG_IA64
88fc241f 168extern int unaligned_dump_stack;
d2b176ed
JS		 169#endif
170
b6fca725
VG		 171#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172extern int no_unaligned_warning;
173#endif
174
d6f8ff73 175#ifdef CONFIG_PROC_SYSCTL
f4aacea2
KC		 176
177#define SYSCTL_WRITES_LEGACY -1
178#define SYSCTL_WRITES_WARN 0
179#define SYSCTL_WRITES_STRICT 1
180
41662f5c 181static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
f4aacea2 182
8d65af78 183static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 184 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 185static int proc_taint(struct ctl_table *table, int write,
34f5a398 186 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 187#endif
9ec52099 188
bfdc0b49 189#ifdef CONFIG_PRINTK
620f6e8e 190static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 191 void __user *buffer, size_t *lenp, loff_t *ppos);
192#endif
193
54b50199
KC		 194static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
195 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 196#ifdef CONFIG_COREDUMP
54b50199
KC		 197static int proc_dostring_coredump(struct ctl_table *table, int write,
198 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 199#endif
54b50199 200
97f5f0cd 201#ifdef CONFIG_MAGIC_SYSRQ
8c6a98b2 202/* Note: sysrq code uses it's own private copy */
8eaede49 203static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
97f5f0cd 204
6f8fd1d7 205static int sysrq_sysctl_handler(struct ctl_table *table, int write,
97f5f0cd
DT		 206 void __user *buffer, size_t *lenp,
207 loff_t *ppos)
208{
209 int error;
210
211 error = proc_dointvec(table, write, buffer, lenp, ppos);
212 if (error)
213 return error;
214
215 if (write)
216 sysrq_toggle_support(__sysrq_enabled);
217
218 return 0;
219}
220
221#endif
222
d8217f07
EB		 223static struct ctl_table kern_table[];
224static struct ctl_table vm_table[];
225static struct ctl_table fs_table[];
226static struct ctl_table debug_table[];
227static struct ctl_table dev_table[];
228extern struct ctl_table random_table[];
7ef9964e
DL		 229#ifdef CONFIG_EPOLL
230extern struct ctl_table epoll_table[];
231#endif
1da177e4
LT		 232
233#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
234int sysctl_legacy_va_layout;
235#endif
236
1da177e4
LT		 237/* The default sysctl tables: */
238
de4e83bd 239static struct ctl_table sysctl_base_table[] = {
1da177e4 240 {
1da177e4
LT		 241 .procname = "kernel",
242 .mode = 0555,
243 .child = kern_table,
244 },
245 {
1da177e4
LT		 246 .procname = "vm",
247 .mode = 0555,
248 .child = vm_table,
249 },
1da177e4 250 {
1da177e4
LT		 251 .procname = "fs",
252 .mode = 0555,
253 .child = fs_table,
254 },
255 {
1da177e4
LT		 256 .procname = "debug",
257 .mode = 0555,
258 .child = debug_table,
259 },
260 {
1da177e4
LT		 261 .procname = "dev",
262 .mode = 0555,
263 .child = dev_table,
264 },
6fce56ec 265 { }
1da177e4
LT		 266};
267
77e54a1f 268#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 269static int min_sched_granularity_ns = 100000; /* 100 usecs */
270static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
271static int min_wakeup_granularity_ns; /* 0 usecs */
272static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
cbee9f88 273#ifdef CONFIG_SMP
1983a922
CE		 274static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
275static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
cbee9f88
PZ		 276#endif /* CONFIG_SMP */
277#endif /* CONFIG_SCHED_DEBUG */
77e54a1f 278
5e771905
MG		 279#ifdef CONFIG_COMPACTION
280static int min_extfrag_threshold;
281static int max_extfrag_threshold = 1000;
282#endif
283
d8217f07 284static struct ctl_table kern_table[] = {
2bba22c5 285 {
2bba22c5
MG		 286 .procname = "sched_child_runs_first",
287 .data = &sysctl_sched_child_runs_first,
288 .maxlen = sizeof(unsigned int),
289 .mode = 0644,
6d456111 290 .proc_handler = proc_dointvec,
2bba22c5 291 },
77e54a1f
IM		 292#ifdef CONFIG_SCHED_DEBUG
293 {
b2be5e96
PZ		 294 .procname = "sched_min_granularity_ns",
295 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 296 .maxlen = sizeof(unsigned int),
297 .mode = 0644,
702a7c76 298 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 299 .extra1 = &min_sched_granularity_ns,
300 .extra2 = &max_sched_granularity_ns,
77e54a1f 301 },
21805085 302 {
21805085
PZ		 303 .procname = "sched_latency_ns",
304 .data = &sysctl_sched_latency,
305 .maxlen = sizeof(unsigned int),
306 .mode = 0644,
702a7c76 307 .proc_handler = sched_proc_update_handler,
21805085
PZ		 308 .extra1 = &min_sched_granularity_ns,
309 .extra2 = &max_sched_granularity_ns,
310 },
77e54a1f 311 {
77e54a1f
IM		 312 .procname = "sched_wakeup_granularity_ns",
313 .data = &sysctl_sched_wakeup_granularity,
314 .maxlen = sizeof(unsigned int),
315 .mode = 0644,
702a7c76 316 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 317 .extra1 = &min_wakeup_granularity_ns,
318 .extra2 = &max_wakeup_granularity_ns,
319 },
cbee9f88 320#ifdef CONFIG_SMP
1983a922 321 {
1983a922
CE		 322 .procname = "sched_tunable_scaling",
323 .data = &sysctl_sched_tunable_scaling,
324 .maxlen = sizeof(enum sched_tunable_scaling),
325 .mode = 0644,
702a7c76 326 .proc_handler = sched_proc_update_handler,
1983a922
CE		 327 .extra1 = &min_sched_tunable_scaling,
328 .extra2 = &max_sched_tunable_scaling,
2398f2c6 329 },
da84d961 330 {
d00535db 331 .procname = "sched_migration_cost_ns",
da84d961
IM		 332 .data = &sysctl_sched_migration_cost,
333 .maxlen = sizeof(unsigned int),
334 .mode = 0644,
6d456111 335 .proc_handler = proc_dointvec,
da84d961 336 },
b82d9fdd 337 {
b82d9fdd
PZ		 338 .procname = "sched_nr_migrate",
339 .data = &sysctl_sched_nr_migrate,
340 .maxlen = sizeof(unsigned int),
fa85ae24 341 .mode = 0644,
6d456111 342 .proc_handler = proc_dointvec,
fa85ae24 343 },
e9e9250b 344 {
d00535db 345 .procname = "sched_time_avg_ms",
e9e9250b
PZ		 346 .data = &sysctl_sched_time_avg,
347 .maxlen = sizeof(unsigned int),
348 .mode = 0644,
6d456111 349 .proc_handler = proc_dointvec,
e9e9250b 350 },
a7a4f8a7 351 {
d00535db 352 .procname = "sched_shares_window_ns",
a7a4f8a7
PT		 353 .data = &sysctl_sched_shares_window,
354 .maxlen = sizeof(unsigned int),
355 .mode = 0644,
356 .proc_handler = proc_dointvec,
357 },
cb251765
MG		 358#ifdef CONFIG_SCHEDSTATS
359 {
360 .procname = "sched_schedstats",
361 .data = NULL,
362 .maxlen = sizeof(unsigned int),
363 .mode = 0644,
364 .proc_handler = sysctl_schedstats,
365 .extra1 = &zero,
366 .extra2 = &one,
367 },
368#endif /* CONFIG_SCHEDSTATS */
cbee9f88
PZ		 369#endif /* CONFIG_SMP */
370#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 371 {
372 .procname = "numa_balancing_scan_delay_ms",
373 .data = &sysctl_numa_balancing_scan_delay,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
cbee9f88
PZ		 378 {
379 .procname = "numa_balancing_scan_period_min_ms",
380 .data = &sysctl_numa_balancing_scan_period_min,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec,
384 },
385 {
386 .procname = "numa_balancing_scan_period_max_ms",
387 .data = &sysctl_numa_balancing_scan_period_max,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec,
391 },
6e5fb223
PZ		 392 {
393 .procname = "numa_balancing_scan_size_mb",
394 .data = &sysctl_numa_balancing_scan_size,
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
64192658
KT		 397 .proc_handler = proc_dointvec_minmax,
398 .extra1 = &one,
6e5fb223 399 },
54a43d54
AK		 400 {
401 .procname = "numa_balancing",
402 .data = NULL, /* filled in by handler */
403 .maxlen = sizeof(unsigned int),
404 .mode = 0644,
405 .proc_handler = sysctl_numa_balancing,
406 .extra1 = &zero,
407 .extra2 = &one,
408 },
cbee9f88
PZ		 409#endif /* CONFIG_NUMA_BALANCING */
410#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 411 {
9f0c1e56
PZ		 412 .procname = "sched_rt_period_us",
413 .data = &sysctl_sched_rt_period,
414 .maxlen = sizeof(unsigned int),
415 .mode = 0644,
6d456111 416 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 417 },
418 {
9f0c1e56
PZ		 419 .procname = "sched_rt_runtime_us",
420 .data = &sysctl_sched_rt_runtime,
421 .maxlen = sizeof(int),
422 .mode = 0644,
6d456111 423 .proc_handler = sched_rt_handler,
9f0c1e56 424 },
ce0dbbbb
CW		 425 {
426 .procname = "sched_rr_timeslice_ms",
427 .data = &sched_rr_timeslice,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = sched_rr_handler,
431 },
5091faa4
MG		 432#ifdef CONFIG_SCHED_AUTOGROUP
433 {
434 .procname = "sched_autogroup_enabled",
435 .data = &sysctl_sched_autogroup_enabled,
436 .maxlen = sizeof(unsigned int),
437 .mode = 0644,
1747b21f 438 .proc_handler = proc_dointvec_minmax,
5091faa4
MG		 439 .extra1 = &zero,
440 .extra2 = &one,
441 },
442#endif
ec12cb7f
PT		 443#ifdef CONFIG_CFS_BANDWIDTH
444 {
445 .procname = "sched_cfs_bandwidth_slice_us",
446 .data = &sysctl_sched_cfs_bandwidth_slice,
447 .maxlen = sizeof(unsigned int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec_minmax,
450 .extra1 = &one,
451 },
452#endif
f20786ff
PZ		 453#ifdef CONFIG_PROVE_LOCKING
454 {
f20786ff
PZ		 455 .procname = "prove_locking",
456 .data = &prove_locking,
457 .maxlen = sizeof(int),
458 .mode = 0644,
6d456111 459 .proc_handler = proc_dointvec,
f20786ff
PZ		 460 },
461#endif
462#ifdef CONFIG_LOCK_STAT
463 {
f20786ff
PZ		 464 .procname = "lock_stat",
465 .data = &lock_stat,
466 .maxlen = sizeof(int),
467 .mode = 0644,
6d456111 468 .proc_handler = proc_dointvec,
f20786ff 469 },
77e54a1f 470#endif
1da177e4 471 {
1da177e4
LT		 472 .procname = "panic",
473 .data = &panic_timeout,
474 .maxlen = sizeof(int),
475 .mode = 0644,
6d456111 476 .proc_handler = proc_dointvec,
1da177e4 477 },
046d662f 478#ifdef CONFIG_COREDUMP
1da177e4 479 {
1da177e4
LT		 480 .procname = "core_uses_pid",
481 .data = &core_uses_pid,
482 .maxlen = sizeof(int),
483 .mode = 0644,
6d456111 484 .proc_handler = proc_dointvec,
1da177e4
LT		 485 },
486 {
1da177e4
LT		 487 .procname = "core_pattern",
488 .data = core_pattern,
71ce92f3 489 .maxlen = CORENAME_MAX_SIZE,
1da177e4 490 .mode = 0644,
54b50199 491 .proc_handler = proc_dostring_coredump,
1da177e4 492 },
a293980c 493 {
a293980c
NH		 494 .procname = "core_pipe_limit",
495 .data = &core_pipe_limit,
496 .maxlen = sizeof(unsigned int),
497 .mode = 0644,
6d456111 498 .proc_handler = proc_dointvec,
a293980c 499 },
046d662f 500#endif
34f5a398 501#ifdef CONFIG_PROC_SYSCTL
1da177e4 502 {
1da177e4 503 .procname = "tainted",
25ddbb18 504 .maxlen = sizeof(long),
34f5a398 505 .mode = 0644,
6d456111 506 .proc_handler = proc_taint,
1da177e4 507 },
f4aacea2
KC		 508 {
509 .procname = "sysctl_writes_strict",
510 .data = &sysctl_writes_strict,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = proc_dointvec_minmax,
514 .extra1 = &neg_one,
515 .extra2 = &one,
516 },
34f5a398 517#endif
9745512c
AV		 518#ifdef CONFIG_LATENCYTOP
519 {
520 .procname = "latencytop",
521 .data = &latencytop_enabled,
522 .maxlen = sizeof(int),
523 .mode = 0644,
cb251765 524 .proc_handler = sysctl_latencytop,
9745512c
AV		 525 },
526#endif
1da177e4
LT		 527#ifdef CONFIG_BLK_DEV_INITRD
528 {
1da177e4
LT		 529 .procname = "real-root-dev",
530 .data = &real_root_dev,
531 .maxlen = sizeof(int),
532 .mode = 0644,
6d456111 533 .proc_handler = proc_dointvec,
1da177e4
LT		 534 },
535#endif
45807a1d 536 {
45807a1d
IM		 537 .procname = "print-fatal-signals",
538 .data = &print_fatal_signals,
539 .maxlen = sizeof(int),
540 .mode = 0644,
6d456111 541 .proc_handler = proc_dointvec,
45807a1d 542 },
72c57ed5 543#ifdef CONFIG_SPARC
1da177e4 544 {
1da177e4
LT		 545 .procname = "reboot-cmd",
546 .data = reboot_command,
547 .maxlen = 256,
548 .mode = 0644,
6d456111 549 .proc_handler = proc_dostring,
1da177e4
LT		 550 },
551 {
1da177e4
LT		 552 .procname = "stop-a",
553 .data = &stop_a_enabled,
554 .maxlen = sizeof (int),
555 .mode = 0644,
6d456111 556 .proc_handler = proc_dointvec,
1da177e4
LT		 557 },
558 {
1da177e4
LT		 559 .procname = "scons-poweroff",
560 .data = &scons_pwroff,
561 .maxlen = sizeof (int),
562 .mode = 0644,
6d456111 563 .proc_handler = proc_dointvec,
1da177e4
LT		 564 },
565#endif
0871420f
DM		 566#ifdef CONFIG_SPARC64
567 {
0871420f
DM		 568 .procname = "tsb-ratio",
569 .data = &sysctl_tsb_ratio,
570 .maxlen = sizeof (int),
571 .mode = 0644,
6d456111 572 .proc_handler = proc_dointvec,
0871420f
DM		 573 },
574#endif
1da177e4
LT		 575#ifdef __hppa__
576 {
1da177e4
LT		 577 .procname = "soft-power",
578 .data = &pwrsw_enabled,
579 .maxlen = sizeof (int),
580 .mode = 0644,
6d456111 581 .proc_handler = proc_dointvec,
1da177e4 582 },
bf14e3b9
VG		 583#endif
584#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 585 {
1da177e4
LT		 586 .procname = "unaligned-trap",
587 .data = &unaligned_enabled,
588 .maxlen = sizeof (int),
589 .mode = 0644,
6d456111 590 .proc_handler = proc_dointvec,
1da177e4
LT		 591 },
592#endif
593 {
1da177e4
LT		 594 .procname = "ctrl-alt-del",
595 .data = &C_A_D,
596 .maxlen = sizeof(int),
597 .mode = 0644,
6d456111 598 .proc_handler = proc_dointvec,
1da177e4 599 },
606576ce 600#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 601 {
b0fc494f
SR		 602 .procname = "ftrace_enabled",
603 .data = &ftrace_enabled,
604 .maxlen = sizeof(int),
605 .mode = 0644,
6d456111 606 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 607 },
608#endif
f38f1d2a
SR		 609#ifdef CONFIG_STACK_TRACER
610 {
f38f1d2a
SR		 611 .procname = "stack_tracer_enabled",
612 .data = &stack_tracer_enabled,
613 .maxlen = sizeof(int),
614 .mode = 0644,
6d456111 615 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 616 },
617#endif
944ac425
SR		 618#ifdef CONFIG_TRACING
619 {
3299b4dd 620 .procname = "ftrace_dump_on_oops",
944ac425
SR		 621 .data = &ftrace_dump_on_oops,
622 .maxlen = sizeof(int),
623 .mode = 0644,
6d456111 624 .proc_handler = proc_dointvec,
944ac425 625 },
de7edd31
SRRH		 626 {
627 .procname = "traceoff_on_warning",
628 .data = &__disable_trace_on_warning,
629 .maxlen = sizeof(__disable_trace_on_warning),
630 .mode = 0644,
631 .proc_handler = proc_dointvec,
632 },
0daa2302
SRRH		 633 {
634 .procname = "tracepoint_printk",
635 .data = &tracepoint_printk,
636 .maxlen = sizeof(tracepoint_printk),
637 .mode = 0644,
638 .proc_handler = proc_dointvec,
639 },
944ac425 640#endif
2965faa5 641#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 642 {
643 .procname = "kexec_load_disabled",
644 .data = &kexec_load_disabled,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 /* only handle a transition from default "0" to "1" */
648 .proc_handler = proc_dointvec_minmax,
649 .extra1 = &one,
650 .extra2 = &one,
651 },
652#endif
a1ef5adb 653#ifdef CONFIG_MODULES
1da177e4 654 {
1da177e4
LT		 655 .procname = "modprobe",
656 .data = &modprobe_path,
657 .maxlen = KMOD_PATH_LEN,
658 .mode = 0644,
6d456111 659 .proc_handler = proc_dostring,
1da177e4 660 },
3d43321b 661 {
3d43321b
KC		 662 .procname = "modules_disabled",
663 .data = &modules_disabled,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 /* only handle a transition from default "0" to "1" */
6d456111 667 .proc_handler = proc_dointvec_minmax,
3d43321b
KC		 668 .extra1 = &one,
669 .extra2 = &one,
670 },
1da177e4 671#endif
86d56134 672#ifdef CONFIG_UEVENT_HELPER
1da177e4 673 {
1da177e4 674 .procname = "hotplug",
312c004d
KS		 675 .data = &uevent_helper,
676 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 677 .mode = 0644,
6d456111 678 .proc_handler = proc_dostring,
1da177e4 679 },
86d56134 680#endif
1da177e4
LT		 681#ifdef CONFIG_CHR_DEV_SG
682 {
1da177e4
LT		 683 .procname = "sg-big-buff",
684 .data = &sg_big_buff,
685 .maxlen = sizeof (int),
686 .mode = 0444,
6d456111 687 .proc_handler = proc_dointvec,
1da177e4
LT		 688 },
689#endif
690#ifdef CONFIG_BSD_PROCESS_ACCT
691 {
1da177e4
LT		 692 .procname = "acct",
693 .data = &acct_parm,
694 .maxlen = 3*sizeof(int),
695 .mode = 0644,
6d456111 696 .proc_handler = proc_dointvec,
1da177e4
LT		 697 },
698#endif
1da177e4
LT		 699#ifdef CONFIG_MAGIC_SYSRQ
700 {
1da177e4 701 .procname = "sysrq",
5d6f647f 702 .data = &__sysrq_enabled,
1da177e4
LT		 703 .maxlen = sizeof (int),
704 .mode = 0644,
97f5f0cd 705 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 706 },
707#endif
d6f8ff73 708#ifdef CONFIG_PROC_SYSCTL
1da177e4 709 {
1da177e4 710 .procname = "cad_pid",
9ec52099 711 .data = NULL,
1da177e4
LT		 712 .maxlen = sizeof (int),
713 .mode = 0600,
6d456111 714 .proc_handler = proc_do_cad_pid,
1da177e4 715 },
d6f8ff73 716#endif
1da177e4 717 {
1da177e4 718 .procname = "threads-max",
16db3d3f 719 .data = NULL,
1da177e4
LT		 720 .maxlen = sizeof(int),
721 .mode = 0644,
16db3d3f 722 .proc_handler = sysctl_max_threads,
1da177e4
LT		 723 },
724 {
1da177e4
LT		 725 .procname = "random",
726 .mode = 0555,
727 .child = random_table,
728 },
17f60a7d
EP		 729 {
730 .procname = "usermodehelper",
731 .mode = 0555,
732 .child = usermodehelper_table,
733 },
1da177e4 734 {
1da177e4
LT		 735 .procname = "overflowuid",
736 .data = &overflowuid,
737 .maxlen = sizeof(int),
738 .mode = 0644,
6d456111 739 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 740 .extra1 = &minolduid,
741 .extra2 = &maxolduid,
742 },
743 {
1da177e4
LT		 744 .procname = "overflowgid",
745 .data = &overflowgid,
746 .maxlen = sizeof(int),
747 .mode = 0644,
6d456111 748 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 749 .extra1 = &minolduid,
750 .extra2 = &maxolduid,
751 },
347a8dc3 752#ifdef CONFIG_S390
1da177e4
LT		 753#ifdef CONFIG_MATHEMU
754 {
1da177e4
LT		 755 .procname = "ieee_emulation_warnings",
756 .data = &sysctl_ieee_emulation_warnings,
757 .maxlen = sizeof(int),
758 .mode = 0644,
6d456111 759 .proc_handler = proc_dointvec,
1da177e4 760 },
1da177e4
LT		 761#endif
762 {
1da177e4 763 .procname = "userprocess_debug",
ab3c68ee 764 .data = &show_unhandled_signals,
1da177e4
LT		 765 .maxlen = sizeof(int),
766 .mode = 0644,
6d456111 767 .proc_handler = proc_dointvec,
1da177e4
LT		 768 },
769#endif
770 {
1da177e4
LT		 771 .procname = "pid_max",
772 .data = &pid_max,
773 .maxlen = sizeof (int),
774 .mode = 0644,
6d456111 775 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 776 .extra1 = &pid_max_min,
777 .extra2 = &pid_max_max,
778 },
779 {
1da177e4
LT		 780 .procname = "panic_on_oops",
781 .data = &panic_on_oops,
782 .maxlen = sizeof(int),
783 .mode = 0644,
6d456111 784 .proc_handler = proc_dointvec,
1da177e4 785 },
7ef3d2fd
JP		 786#if defined CONFIG_PRINTK
787 {
7ef3d2fd
JP		 788 .procname = "printk",
789 .data = &console_loglevel,
790 .maxlen = 4*sizeof(int),
791 .mode = 0644,
6d456111 792 .proc_handler = proc_dointvec,
7ef3d2fd 793 },
1da177e4 794 {
1da177e4 795 .procname = "printk_ratelimit",
717115e1 796 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 797 .maxlen = sizeof(int),
798 .mode = 0644,
6d456111 799 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 800 },
801 {
1da177e4 802 .procname = "printk_ratelimit_burst",
717115e1 803 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 804 .maxlen = sizeof(int),
805 .mode = 0644,
6d456111 806 .proc_handler = proc_dointvec,
1da177e4 807 },
af91322e 808 {
af91322e
DY		 809 .procname = "printk_delay",
810 .data = &printk_delay_msec,
811 .maxlen = sizeof(int),
812 .mode = 0644,
6d456111 813 .proc_handler = proc_dointvec_minmax,
af91322e
DY		 814 .extra1 = &zero,
815 .extra2 = &ten_thousand,
816 },
750afe7b
BP		 817 {
818 .procname = "printk_devkmsg",
819 .data = devkmsg_log_str,
820 .maxlen = DEVKMSG_STR_MAX_SIZE,
821 .mode = 0644,
822 .proc_handler = devkmsg_sysctl_set_loglvl,
823 },
eaf06b24
DR		 824 {
825 .procname = "dmesg_restrict",
826 .data = &dmesg_restrict,
827 .maxlen = sizeof(int),
828 .mode = 0644,
620f6e8e 829 .proc_handler = proc_dointvec_minmax_sysadmin,
eaf06b24
DR		 830 .extra1 = &zero,
831 .extra2 = &one,
832 },
455cd5ab
DR		 833 {
834 .procname = "kptr_restrict",
835 .data = &kptr_restrict,
836 .maxlen = sizeof(int),
837 .mode = 0644,
620f6e8e 838 .proc_handler = proc_dointvec_minmax_sysadmin,
455cd5ab
DR		 839 .extra1 = &zero,
840 .extra2 = &two,
841 },
df6e61d4 842#endif
1da177e4 843 {
1da177e4
LT		 844 .procname = "ngroups_max",
845 .data = &ngroups_max,
846 .maxlen = sizeof (int),
847 .mode = 0444,
6d456111 848 .proc_handler = proc_dointvec,
1da177e4 849 },
73efc039
DB		 850 {
851 .procname = "cap_last_cap",
852 .data = (void *)&cap_last_cap,
853 .maxlen = sizeof(int),
854 .mode = 0444,
855 .proc_handler = proc_dointvec,
856 },
58687acb 857#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 858 {
58687acb 859 .procname = "watchdog",
3c00ea82 860 .data = &watchdog_user_enabled,
504d7cf1
DZ		 861 .maxlen = sizeof (int),
862 .mode = 0644,
195daf66 863 .proc_handler = proc_watchdog,
586692a5
MSB		 864 .extra1 = &zero,
865 .extra2 = &one,
58687acb
DZ		 866 },
867 {
868 .procname = "watchdog_thresh",
586692a5 869 .data = &watchdog_thresh,
58687acb
DZ		 870 .maxlen = sizeof(int),
871 .mode = 0644,
195daf66 872 .proc_handler = proc_watchdog_thresh,
a6572f84 873 .extra1 = &zero,
58687acb 874 .extra2 = &sixty,
504d7cf1 875 },
195daf66
UO		 876 {
877 .procname = "nmi_watchdog",
878 .data = &nmi_watchdog_enabled,
879 .maxlen = sizeof (int),
880 .mode = 0644,
881 .proc_handler = proc_nmi_watchdog,
882 .extra1 = &zero,
883#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
884 .extra2 = &one,
885#else
886 .extra2 = &zero,
887#endif
888 },
889 {
890 .procname = "soft_watchdog",
891 .data = &soft_watchdog_enabled,
892 .maxlen = sizeof (int),
893 .mode = 0644,
894 .proc_handler = proc_soft_watchdog,
895 .extra1 = &zero,
896 .extra2 = &one,
897 },
fe4ba3c3
CM		 898 {
899 .procname = "watchdog_cpumask",
900 .data = &watchdog_cpumask_bits,
901 .maxlen = NR_CPUS,
902 .mode = 0644,
903 .proc_handler = proc_watchdog_cpumask,
904 },
2508ce18
DZ		 905 {
906 .procname = "softlockup_panic",
907 .data = &softlockup_panic,
908 .maxlen = sizeof(int),
909 .mode = 0644,
910 .proc_handler = proc_dointvec_minmax,
911 .extra1 = &zero,
912 .extra2 = &one,
913 },
ac1f5912
DZ		 914#ifdef CONFIG_HARDLOCKUP_DETECTOR
915 {
916 .procname = "hardlockup_panic",
917 .data = &hardlockup_panic,
918 .maxlen = sizeof(int),
919 .mode = 0644,
920 .proc_handler = proc_dointvec_minmax,
921 .extra1 = &zero,
922 .extra2 = &one,
923 },
924#endif
ed235875
AT		 925#ifdef CONFIG_SMP
926 {
927 .procname = "softlockup_all_cpu_backtrace",
928 .data = &sysctl_softlockup_all_cpu_backtrace,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec_minmax,
932 .extra1 = &zero,
933 .extra2 = &one,
934 },
55537871
JK		 935 {
936 .procname = "hardlockup_all_cpu_backtrace",
937 .data = &sysctl_hardlockup_all_cpu_backtrace,
938 .maxlen = sizeof(int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec_minmax,
941 .extra1 = &zero,
942 .extra2 = &one,
943 },
ed235875 944#endif /* CONFIG_SMP */
5dc30558
DZ		 945#endif
946#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
947 {
948 .procname = "unknown_nmi_panic",
949 .data = &unknown_nmi_panic,
950 .maxlen = sizeof (int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec,
953 },
504d7cf1 954#endif
1da177e4 955#if defined(CONFIG_X86)
8da5adda 956 {
8da5adda
DZ		 957 .procname = "panic_on_unrecovered_nmi",
958 .data = &panic_on_unrecovered_nmi,
959 .maxlen = sizeof(int),
960 .mode = 0644,
6d456111 961 .proc_handler = proc_dointvec,
8da5adda 962 },
5211a242 963 {
5211a242
KG		 964 .procname = "panic_on_io_nmi",
965 .data = &panic_on_io_nmi,
966 .maxlen = sizeof(int),
967 .mode = 0644,
6d456111 968 .proc_handler = proc_dointvec,
5211a242 969 },
55af7796
MH		 970#ifdef CONFIG_DEBUG_STACKOVERFLOW
971 {
972 .procname = "panic_on_stackoverflow",
973 .data = &sysctl_panic_on_stackoverflow,
974 .maxlen = sizeof(int),
975 .mode = 0644,
976 .proc_handler = proc_dointvec,
977 },
978#endif
1da177e4 979 {
1da177e4
LT		 980 .procname = "bootloader_type",
981 .data = &bootloader_type,
982 .maxlen = sizeof (int),
983 .mode = 0444,
6d456111 984 .proc_handler = proc_dointvec,
1da177e4 985 },
5031296c 986 {
5031296c
PA		 987 .procname = "bootloader_version",
988 .data = &bootloader_version,
989 .maxlen = sizeof (int),
990 .mode = 0444,
6d456111 991 .proc_handler = proc_dointvec,
5031296c 992 },
0741f4d2 993 {
0741f4d2
CE		 994 .procname = "kstack_depth_to_print",
995 .data = &kstack_depth_to_print,
996 .maxlen = sizeof(int),
997 .mode = 0644,
6d456111 998 .proc_handler = proc_dointvec,
0741f4d2 999 },
6e7c4025 1000 {
6e7c4025
IM		 1001 .procname = "io_delay_type",
1002 .data = &io_delay_type,
1003 .maxlen = sizeof(int),
1004 .mode = 0644,
6d456111 1005 .proc_handler = proc_dointvec,
6e7c4025 1006 },
1da177e4 1007#endif
7a9166e3 1008#if defined(CONFIG_MMU)
1da177e4 1009 {
1da177e4
LT		 1010 .procname = "randomize_va_space",
1011 .data = &randomize_va_space,
1012 .maxlen = sizeof(int),
1013 .mode = 0644,
6d456111 1014 .proc_handler = proc_dointvec,
1da177e4 1015 },
7a9166e3 1016#endif
0152fb37 1017#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1018 {
951f22d5
MS		 1019 .procname = "spin_retry",
1020 .data = &spin_retry,
1021 .maxlen = sizeof (int),
1022 .mode = 0644,
6d456111 1023 .proc_handler = proc_dointvec,
951f22d5 1024 },
c255d844 1025#endif
673d5b43 1026#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1027 {
c255d844 1028 .procname = "acpi_video_flags",
77afcf78 1029 .data = &acpi_realmode_flags,
c255d844
PM		 1030 .maxlen = sizeof (unsigned long),
1031 .mode = 0644,
6d456111 1032 .proc_handler = proc_doulongvec_minmax,
c255d844 1033 },
d2b176ed 1034#endif
b6fca725 1035#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1036 {
d2b176ed
JS		 1037 .procname = "ignore-unaligned-usertrap",
1038 .data = &no_unaligned_warning,
1039 .maxlen = sizeof (int),
1040 .mode = 0644,
6d456111 1041 .proc_handler = proc_dointvec,
d2b176ed 1042 },
b6fca725
VG		 1043#endif
1044#ifdef CONFIG_IA64
88fc241f 1045 {
88fc241f
DC		 1046 .procname = "unaligned-dump-stack",
1047 .data = &unaligned_dump_stack,
1048 .maxlen = sizeof (int),
1049 .mode = 0644,
6d456111 1050 .proc_handler = proc_dointvec,
88fc241f 1051 },
bebfa101 1052#endif
e162b39a
MSB		 1053#ifdef CONFIG_DETECT_HUNG_TASK
1054 {
e162b39a
MSB		 1055 .procname = "hung_task_panic",
1056 .data = &sysctl_hung_task_panic,
1057 .maxlen = sizeof(int),
1058 .mode = 0644,
6d456111 1059 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 1060 .extra1 = &zero,
1061 .extra2 = &one,
1062 },
82a1fcb9 1063 {
82a1fcb9
IM		 1064 .procname = "hung_task_check_count",
1065 .data = &sysctl_hung_task_check_count,
cd64647f 1066 .maxlen = sizeof(int),
82a1fcb9 1067 .mode = 0644,
cd64647f
LZ		 1068 .proc_handler = proc_dointvec_minmax,
1069 .extra1 = &zero,
82a1fcb9
IM		 1070 },
1071 {
82a1fcb9
IM		 1072 .procname = "hung_task_timeout_secs",
1073 .data = &sysctl_hung_task_timeout_secs,
90739081 1074 .maxlen = sizeof(unsigned long),
82a1fcb9 1075 .mode = 0644,
6d456111 1076 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1077 .extra2 = &hung_task_timeout_max,
82a1fcb9
IM		 1078 },
1079 {
82a1fcb9
IM		 1080 .procname = "hung_task_warnings",
1081 .data = &sysctl_hung_task_warnings,
270750db 1082 .maxlen = sizeof(int),
82a1fcb9 1083 .mode = 0644,
270750db
AT		 1084 .proc_handler = proc_dointvec_minmax,
1085 .extra1 = &neg_one,
82a1fcb9 1086 },
c4f3b63f 1087#endif
bebfa101
AK		 1088#ifdef CONFIG_COMPAT
1089 {
bebfa101
AK		 1090 .procname = "compat-log",
1091 .data = &compat_log,
1092 .maxlen = sizeof (int),
1093 .mode = 0644,
6d456111 1094 .proc_handler = proc_dointvec,
bebfa101 1095 },
951f22d5 1096#endif
23f78d4a
IM		 1097#ifdef CONFIG_RT_MUTEXES
1098 {
23f78d4a
IM		 1099 .procname = "max_lock_depth",
1100 .data = &max_lock_depth,
1101 .maxlen = sizeof(int),
1102 .mode = 0644,
6d456111 1103 .proc_handler = proc_dointvec,
23f78d4a 1104 },
5096add8 1105#endif
10a0a8d4 1106 {
10a0a8d4
JF		 1107 .procname = "poweroff_cmd",
1108 .data = &poweroff_cmd,
1109 .maxlen = POWEROFF_CMD_PATH_LEN,
1110 .mode = 0644,
6d456111 1111 .proc_handler = proc_dostring,
10a0a8d4 1112 },
0b77f5bf
DH		 1113#ifdef CONFIG_KEYS
1114 {
0b77f5bf
DH		 1115 .procname = "keys",
1116 .mode = 0555,
1117 .child = key_sysctls,
1118 },
1119#endif
cdd6c482 1120#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1121 /*
1122 * User-space scripts rely on the existence of this file
1123 * as a feature check for perf_events being enabled.
1124 *
1125 * So it's an ABI, do not remove!
1126 */
1ccd1549 1127 {
cdd6c482
IM		 1128 .procname = "perf_event_paranoid",
1129 .data = &sysctl_perf_event_paranoid,
1130 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1131 .mode = 0644,
6d456111 1132 .proc_handler = proc_dointvec,
1ccd1549 1133 },
c5078f78 1134 {
cdd6c482
IM		 1135 .procname = "perf_event_mlock_kb",
1136 .data = &sysctl_perf_event_mlock,
1137 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1138 .mode = 0644,
6d456111 1139 .proc_handler = proc_dointvec,
c5078f78 1140 },
a78ac325 1141 {
cdd6c482
IM		 1142 .procname = "perf_event_max_sample_rate",
1143 .data = &sysctl_perf_event_sample_rate,
1144 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1145 .mode = 0644,
163ec435 1146 .proc_handler = perf_proc_update_handler,
723478c8 1147 .extra1 = &one,
a78ac325 1148 },
14c63f17
DH		 1149 {
1150 .procname = "perf_cpu_time_max_percent",
1151 .data = &sysctl_perf_cpu_time_max_percent,
1152 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1153 .mode = 0644,
1154 .proc_handler = perf_cpu_time_max_percent_handler,
1155 .extra1 = &zero,
1156 .extra2 = &one_hundred,
1157 },
c5dfd78e
ACM		 1158 {
1159 .procname = "perf_event_max_stack",
a831100a 1160 .data = &sysctl_perf_event_max_stack,
c5dfd78e
ACM		 1161 .maxlen = sizeof(sysctl_perf_event_max_stack),
1162 .mode = 0644,
1163 .proc_handler = perf_event_max_stack_handler,
1164 .extra1 = &zero,
1165 .extra2 = &six_hundred_forty_kb,
1166 },
c85b0334
ACM		 1167 {
1168 .procname = "perf_event_max_contexts_per_stack",
1169 .data = &sysctl_perf_event_max_contexts_per_stack,
1170 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1171 .mode = 0644,
1172 .proc_handler = perf_event_max_stack_handler,
1173 .extra1 = &zero,
1174 .extra2 = &one_thousand,
1175 },
1ccd1549 1176#endif
dfec072e
VN		 1177#ifdef CONFIG_KMEMCHECK
1178 {
dfec072e
VN		 1179 .procname = "kmemcheck",
1180 .data = &kmemcheck_enabled,
1181 .maxlen = sizeof(int),
1182 .mode = 0644,
6d456111 1183 .proc_handler = proc_dointvec,
dfec072e 1184 },
cb684b5b 1185#endif
9e3961a0
PB		 1186 {
1187 .procname = "panic_on_warn",
1188 .data = &panic_on_warn,
1189 .maxlen = sizeof(int),
1190 .mode = 0644,
1191 .proc_handler = proc_dointvec_minmax,
1192 .extra1 = &zero,
1193 .extra2 = &one,
1194 },
bc7a34b8
TG		 1195#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1196 {
1197 .procname = "timer_migration",
1198 .data = &sysctl_timer_migration,
1199 .maxlen = sizeof(unsigned int),
1200 .mode = 0644,
1201 .proc_handler = timer_migration_handler,
1202 },
1be7f75d
AS		 1203#endif
1204#ifdef CONFIG_BPF_SYSCALL
1205 {
1206 .procname = "unprivileged_bpf_disabled",
1207 .data = &sysctl_unprivileged_bpf_disabled,
1208 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1209 .mode = 0644,
1210 /* only handle a transition from default "0" to "1" */
1211 .proc_handler = proc_dointvec_minmax,
1212 .extra1 = &one,
1213 .extra2 = &one,
1214 },
088e9d25
DBO		 1215#endif
1216#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1217 {
1218 .procname = "panic_on_rcu_stall",
1219 .data = &sysctl_panic_on_rcu_stall,
1220 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1221 .mode = 0644,
1222 .proc_handler = proc_dointvec_minmax,
1223 .extra1 = &zero,
1224 .extra2 = &one,
1225 },
bc7a34b8 1226#endif
6fce56ec 1227 { }
1da177e4
LT		 1228};
1229
d8217f07 1230static struct ctl_table vm_table[] = {
1da177e4 1231 {
1da177e4
LT		 1232 .procname = "overcommit_memory",
1233 .data = &sysctl_overcommit_memory,
1234 .maxlen = sizeof(sysctl_overcommit_memory),
1235 .mode = 0644,
cb16e95f
PH		 1236 .proc_handler = proc_dointvec_minmax,
1237 .extra1 = &zero,
1238 .extra2 = &two,
1da177e4 1239 },
fadd8fbd 1240 {
fadd8fbd
KH		 1241 .procname = "panic_on_oom",
1242 .data = &sysctl_panic_on_oom,
1243 .maxlen = sizeof(sysctl_panic_on_oom),
1244 .mode = 0644,
cb16e95f
PH		 1245 .proc_handler = proc_dointvec_minmax,
1246 .extra1 = &zero,
1247 .extra2 = &two,
fadd8fbd 1248 },
fe071d7e 1249 {
fe071d7e
DR		 1250 .procname = "oom_kill_allocating_task",
1251 .data = &sysctl_oom_kill_allocating_task,
1252 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1253 .mode = 0644,
6d456111 1254 .proc_handler = proc_dointvec,
fe071d7e 1255 },
fef1bdd6 1256 {
fef1bdd6
DR		 1257 .procname = "oom_dump_tasks",
1258 .data = &sysctl_oom_dump_tasks,
1259 .maxlen = sizeof(sysctl_oom_dump_tasks),
1260 .mode = 0644,
6d456111 1261 .proc_handler = proc_dointvec,
fef1bdd6 1262 },
1da177e4 1263 {
1da177e4
LT		 1264 .procname = "overcommit_ratio",
1265 .data = &sysctl_overcommit_ratio,
1266 .maxlen = sizeof(sysctl_overcommit_ratio),
1267 .mode = 0644,
49f0ce5f
JM		 1268 .proc_handler = overcommit_ratio_handler,
1269 },
1270 {
1271 .procname = "overcommit_kbytes",
1272 .data = &sysctl_overcommit_kbytes,
1273 .maxlen = sizeof(sysctl_overcommit_kbytes),
1274 .mode = 0644,
1275 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1276 },
1277 {
1da177e4
LT		 1278 .procname = "page-cluster",
1279 .data = &page_cluster,
1280 .maxlen = sizeof(int),
1281 .mode = 0644,
cb16e95f
PH		 1282 .proc_handler = proc_dointvec_minmax,
1283 .extra1 = &zero,
1da177e4
LT		 1284 },
1285 {
1da177e4
LT		 1286 .procname = "dirty_background_ratio",
1287 .data = &dirty_background_ratio,
1288 .maxlen = sizeof(dirty_background_ratio),
1289 .mode = 0644,
6d456111 1290 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1291 .extra1 = &zero,
1292 .extra2 = &one_hundred,
1293 },
2da02997 1294 {
2da02997
DR		 1295 .procname = "dirty_background_bytes",
1296 .data = &dirty_background_bytes,
1297 .maxlen = sizeof(dirty_background_bytes),
1298 .mode = 0644,
6d456111 1299 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1300 .extra1 = &one_ul,
2da02997 1301 },
1da177e4 1302 {
1da177e4
LT		 1303 .procname = "dirty_ratio",
1304 .data = &vm_dirty_ratio,
1305 .maxlen = sizeof(vm_dirty_ratio),
1306 .mode = 0644,
6d456111 1307 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1308 .extra1 = &zero,
1309 .extra2 = &one_hundred,
1310 },
2da02997 1311 {
2da02997
DR		 1312 .procname = "dirty_bytes",
1313 .data = &vm_dirty_bytes,
1314 .maxlen = sizeof(vm_dirty_bytes),
1315 .mode = 0644,
6d456111 1316 .proc_handler = dirty_bytes_handler,
9e4a5bda 1317 .extra1 = &dirty_bytes_min,
2da02997 1318 },
1da177e4 1319 {
1da177e4 1320 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1321 .data = &dirty_writeback_interval,
1322 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1323 .mode = 0644,
6d456111 1324 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1325 },
1326 {
1da177e4 1327 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1328 .data = &dirty_expire_interval,
1329 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1330 .mode = 0644,
cb16e95f
PH		 1331 .proc_handler = proc_dointvec_minmax,
1332 .extra1 = &zero,
1da177e4 1333 },
1efff914
TT		 1334 {
1335 .procname = "dirtytime_expire_seconds",
1336 .data = &dirtytime_expire_interval,
1337 .maxlen = sizeof(dirty_expire_interval),
1338 .mode = 0644,
1339 .proc_handler = dirtytime_interval_handler,
1340 .extra1 = &zero,
1341 },
1da177e4 1342 {
3965c9ae
WL		 1343 .procname = "nr_pdflush_threads",
1344 .mode = 0444 /* read-only */,
1345 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1346 },
1347 {
1da177e4
LT		 1348 .procname = "swappiness",
1349 .data = &vm_swappiness,
1350 .maxlen = sizeof(vm_swappiness),
1351 .mode = 0644,
6d456111 1352 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1353 .extra1 = &zero,
1354 .extra2 = &one_hundred,
1355 },
1356#ifdef CONFIG_HUGETLB_PAGE
06808b08 1357 {
1da177e4 1358 .procname = "nr_hugepages",
e5ff2159 1359 .data = NULL,
1da177e4
LT		 1360 .maxlen = sizeof(unsigned long),
1361 .mode = 0644,
6d456111 1362 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1363 },
1364#ifdef CONFIG_NUMA
1365 {
1366 .procname = "nr_hugepages_mempolicy",
1367 .data = NULL,
1368 .maxlen = sizeof(unsigned long),
1369 .mode = 0644,
1370 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1371 },
1372#endif
1da177e4 1373 {
1da177e4
LT		 1374 .procname = "hugetlb_shm_group",
1375 .data = &sysctl_hugetlb_shm_group,
1376 .maxlen = sizeof(gid_t),
1377 .mode = 0644,
6d456111 1378 .proc_handler = proc_dointvec,
1da177e4 1379 },
396faf03 1380 {
396faf03
MG		 1381 .procname = "hugepages_treat_as_movable",
1382 .data = &hugepages_treat_as_movable,
1383 .maxlen = sizeof(int),
1384 .mode = 0644,
86cdb465 1385 .proc_handler = proc_dointvec,
396faf03 1386 },
d1c3fb1f 1387 {
d1c3fb1f 1388 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1389 .data = NULL,
1390 .maxlen = sizeof(unsigned long),
d1c3fb1f 1391 .mode = 0644,
6d456111 1392 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1393 },
1da177e4
LT		 1394#endif
1395 {
1da177e4
LT		 1396 .procname = "lowmem_reserve_ratio",
1397 .data = &sysctl_lowmem_reserve_ratio,
1398 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1399 .mode = 0644,
6d456111 1400 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1401 },
9d0243bc 1402 {
9d0243bc
AM		 1403 .procname = "drop_caches",
1404 .data = &sysctl_drop_caches,
1405 .maxlen = sizeof(int),
1406 .mode = 0644,
1407 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1408 .extra1 = &one,
5509a5d2 1409 .extra2 = &four,
9d0243bc 1410 },
76ab0f53
MG		 1411#ifdef CONFIG_COMPACTION
1412 {
1413 .procname = "compact_memory",
1414 .data = &sysctl_compact_memory,
1415 .maxlen = sizeof(int),
1416 .mode = 0200,
1417 .proc_handler = sysctl_compaction_handler,
1418 },
5e771905
MG		 1419 {
1420 .procname = "extfrag_threshold",
1421 .data = &sysctl_extfrag_threshold,
1422 .maxlen = sizeof(int),
1423 .mode = 0644,
1424 .proc_handler = sysctl_extfrag_handler,
1425 .extra1 = &min_extfrag_threshold,
1426 .extra2 = &max_extfrag_threshold,
1427 },
5bbe3547
EM		 1428 {
1429 .procname = "compact_unevictable_allowed",
1430 .data = &sysctl_compact_unevictable_allowed,
1431 .maxlen = sizeof(int),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec,
1434 .extra1 = &zero,
1435 .extra2 = &one,
1436 },
5e771905 1437
76ab0f53 1438#endif /* CONFIG_COMPACTION */
1da177e4 1439 {
1da177e4
LT		 1440 .procname = "min_free_kbytes",
1441 .data = &min_free_kbytes,
1442 .maxlen = sizeof(min_free_kbytes),
1443 .mode = 0644,
6d456111 1444 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1445 .extra1 = &zero,
1446 },
795ae7a0
JW		 1447 {
1448 .procname = "watermark_scale_factor",
1449 .data = &watermark_scale_factor,
1450 .maxlen = sizeof(watermark_scale_factor),
1451 .mode = 0644,
1452 .proc_handler = watermark_scale_factor_sysctl_handler,
1453 .extra1 = &one,
1454 .extra2 = &one_thousand,
1455 },
8ad4b1fb 1456 {
8ad4b1fb
RS		 1457 .procname = "percpu_pagelist_fraction",
1458 .data = &percpu_pagelist_fraction,
1459 .maxlen = sizeof(percpu_pagelist_fraction),
1460 .mode = 0644,
6d456111 1461 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1462 .extra1 = &zero,
8ad4b1fb 1463 },
1da177e4
LT		 1464#ifdef CONFIG_MMU
1465 {
1da177e4
LT		 1466 .procname = "max_map_count",
1467 .data = &sysctl_max_map_count,
1468 .maxlen = sizeof(sysctl_max_map_count),
1469 .mode = 0644,
3e26120c 1470 .proc_handler = proc_dointvec_minmax,
70da2340 1471 .extra1 = &zero,
1da177e4 1472 },
dd8632a1
PM		 1473#else
1474 {
dd8632a1
PM		 1475 .procname = "nr_trim_pages",
1476 .data = &sysctl_nr_trim_pages,
1477 .maxlen = sizeof(sysctl_nr_trim_pages),
1478 .mode = 0644,
6d456111 1479 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1480 .extra1 = &zero,
1481 },
1da177e4
LT		 1482#endif
1483 {
1da177e4
LT		 1484 .procname = "laptop_mode",
1485 .data = &laptop_mode,
1486 .maxlen = sizeof(laptop_mode),
1487 .mode = 0644,
6d456111 1488 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1489 },
1490 {
1da177e4
LT		 1491 .procname = "block_dump",
1492 .data = &block_dump,
1493 .maxlen = sizeof(block_dump),
1494 .mode = 0644,
6d456111 1495 .proc_handler = proc_dointvec,
1da177e4
LT		 1496 .extra1 = &zero,
1497 },
1498 {
1da177e4
LT		 1499 .procname = "vfs_cache_pressure",
1500 .data = &sysctl_vfs_cache_pressure,
1501 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1502 .mode = 0644,
6d456111 1503 .proc_handler = proc_dointvec,
1da177e4
LT		 1504 .extra1 = &zero,
1505 },
1506#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1507 {
1da177e4
LT		 1508 .procname = "legacy_va_layout",
1509 .data = &sysctl_legacy_va_layout,
1510 .maxlen = sizeof(sysctl_legacy_va_layout),
1511 .mode = 0644,
6d456111 1512 .proc_handler = proc_dointvec,
1da177e4
LT		 1513 .extra1 = &zero,
1514 },
1515#endif
1743660b
CL		 1516#ifdef CONFIG_NUMA
1517 {
1743660b 1518 .procname = "zone_reclaim_mode",
a5f5f91d
MG		 1519 .data = &node_reclaim_mode,
1520 .maxlen = sizeof(node_reclaim_mode),
1743660b 1521 .mode = 0644,
6d456111 1522 .proc_handler = proc_dointvec,
c84db23c 1523 .extra1 = &zero,
1743660b 1524 },
9614634f 1525 {
9614634f
CL		 1526 .procname = "min_unmapped_ratio",
1527 .data = &sysctl_min_unmapped_ratio,
1528 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1529 .mode = 0644,
6d456111 1530 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1531 .extra1 = &zero,
1532 .extra2 = &one_hundred,
1533 },
0ff38490 1534 {
0ff38490
CL		 1535 .procname = "min_slab_ratio",
1536 .data = &sysctl_min_slab_ratio,
1537 .maxlen = sizeof(sysctl_min_slab_ratio),
1538 .mode = 0644,
6d456111 1539 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1540 .extra1 = &zero,
1541 .extra2 = &one_hundred,
1542 },
e6e5494c 1543#endif
77461ab3
CL		 1544#ifdef CONFIG_SMP
1545 {
77461ab3
CL		 1546 .procname = "stat_interval",
1547 .data = &sysctl_stat_interval,
1548 .maxlen = sizeof(sysctl_stat_interval),
1549 .mode = 0644,
6d456111 1550 .proc_handler = proc_dointvec_jiffies,
77461ab3 1551 },
52b6f46b
HD		 1552 {
1553 .procname = "stat_refresh",
1554 .data = NULL,
1555 .maxlen = 0,
1556 .mode = 0600,
1557 .proc_handler = vmstat_refresh,
1558 },
77461ab3 1559#endif
6e141546 1560#ifdef CONFIG_MMU
ed032189 1561 {
ed032189 1562 .procname = "mmap_min_addr",
788084ab
EP		 1563 .data = &dac_mmap_min_addr,
1564 .maxlen = sizeof(unsigned long),
ed032189 1565 .mode = 0644,
6d456111 1566 .proc_handler = mmap_min_addr_handler,
ed032189 1567 },
6e141546 1568#endif
f0c0b2b8
KH		 1569#ifdef CONFIG_NUMA
1570 {
f0c0b2b8
KH		 1571 .procname = "numa_zonelist_order",
1572 .data = &numa_zonelist_order,
1573 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1574 .mode = 0644,
6d456111 1575 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1576 },
1577#endif
2b8232ce 1578#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1579 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1580 {
e6e5494c 1581 .procname = "vdso_enabled",
3d7ee969
AL		 1582#ifdef CONFIG_X86_32
1583 .data = &vdso32_enabled,
1584 .maxlen = sizeof(vdso32_enabled),
1585#else
e6e5494c
IM		 1586 .data = &vdso_enabled,
1587 .maxlen = sizeof(vdso_enabled),
3d7ee969 1588#endif
e6e5494c 1589 .mode = 0644,
6d456111 1590 .proc_handler = proc_dointvec,
e6e5494c
IM		 1591 .extra1 = &zero,
1592 },
1da177e4 1593#endif
195cf453
BG		 1594#ifdef CONFIG_HIGHMEM
1595 {
195cf453
BG		 1596 .procname = "highmem_is_dirtyable",
1597 .data = &vm_highmem_is_dirtyable,
1598 .maxlen = sizeof(vm_highmem_is_dirtyable),
1599 .mode = 0644,
6d456111 1600 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1601 .extra1 = &zero,
1602 .extra2 = &one,
1603 },
1604#endif
6a46079c
AK		 1605#ifdef CONFIG_MEMORY_FAILURE
1606 {
6a46079c
AK		 1607 .procname = "memory_failure_early_kill",
1608 .data = &sysctl_memory_failure_early_kill,
1609 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1610 .mode = 0644,
6d456111 1611 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1612 .extra1 = &zero,
1613 .extra2 = &one,
1614 },
1615 {
6a46079c
AK		 1616 .procname = "memory_failure_recovery",
1617 .data = &sysctl_memory_failure_recovery,
1618 .maxlen = sizeof(sysctl_memory_failure_recovery),
1619 .mode = 0644,
6d456111 1620 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1621 .extra1 = &zero,
1622 .extra2 = &one,
1623 },
1624#endif
c9b1d098
AS		 1625 {
1626 .procname = "user_reserve_kbytes",
1627 .data = &sysctl_user_reserve_kbytes,
1628 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1629 .mode = 0644,
1630 .proc_handler = proc_doulongvec_minmax,
1631 },
4eeab4f5
AS		 1632 {
1633 .procname = "admin_reserve_kbytes",
1634 .data = &sysctl_admin_reserve_kbytes,
1635 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1636 .mode = 0644,
1637 .proc_handler = proc_doulongvec_minmax,
1638 },
d07e2259
DC		 1639#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1640 {
1641 .procname = "mmap_rnd_bits",
1642 .data = &mmap_rnd_bits,
1643 .maxlen = sizeof(mmap_rnd_bits),
1644 .mode = 0600,
1645 .proc_handler = proc_dointvec_minmax,
1646 .extra1 = (void *)&mmap_rnd_bits_min,
1647 .extra2 = (void *)&mmap_rnd_bits_max,
1648 },
1649#endif
1650#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1651 {
1652 .procname = "mmap_rnd_compat_bits",
1653 .data = &mmap_rnd_compat_bits,
1654 .maxlen = sizeof(mmap_rnd_compat_bits),
1655 .mode = 0600,
1656 .proc_handler = proc_dointvec_minmax,
1657 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1658 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1659 },
1660#endif
6fce56ec 1661 { }
1da177e4
LT		 1662};
1663
d8217f07 1664static struct ctl_table fs_table[] = {
1da177e4 1665 {
1da177e4
LT		 1666 .procname = "inode-nr",
1667 .data = &inodes_stat,
3942c07c 1668 .maxlen = 2*sizeof(long),
1da177e4 1669 .mode = 0444,
cffbc8aa 1670 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1671 },
1672 {
1da177e4
LT		 1673 .procname = "inode-state",
1674 .data = &inodes_stat,
3942c07c 1675 .maxlen = 7*sizeof(long),
1da177e4 1676 .mode = 0444,
cffbc8aa 1677 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1678 },
1679 {
1da177e4
LT		 1680 .procname = "file-nr",
1681 .data = &files_stat,
518de9b3 1682 .maxlen = sizeof(files_stat),
1da177e4 1683 .mode = 0444,
6d456111 1684 .proc_handler = proc_nr_files,
1da177e4
LT		 1685 },
1686 {
1da177e4
LT		 1687 .procname = "file-max",
1688 .data = &files_stat.max_files,
518de9b3 1689 .maxlen = sizeof(files_stat.max_files),
1da177e4 1690 .mode = 0644,
518de9b3 1691 .proc_handler = proc_doulongvec_minmax,
1da177e4 1692 },
9cfe015a 1693 {
9cfe015a
ED		 1694 .procname = "nr_open",
1695 .data = &sysctl_nr_open,
1696 .maxlen = sizeof(int),
1697 .mode = 0644,
6d456111 1698 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1699 .extra1 = &sysctl_nr_open_min,
1700 .extra2 = &sysctl_nr_open_max,
9cfe015a 1701 },
1da177e4 1702 {
1da177e4
LT		 1703 .procname = "dentry-state",
1704 .data = &dentry_stat,
3942c07c 1705 .maxlen = 6*sizeof(long),
1da177e4 1706 .mode = 0444,
312d3ca8 1707 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1708 },
1709 {
1da177e4
LT		 1710 .procname = "overflowuid",
1711 .data = &fs_overflowuid,
1712 .maxlen = sizeof(int),
1713 .mode = 0644,
6d456111 1714 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1715 .extra1 = &minolduid,
1716 .extra2 = &maxolduid,
1717 },
1718 {
1da177e4
LT		 1719 .procname = "overflowgid",
1720 .data = &fs_overflowgid,
1721 .maxlen = sizeof(int),
1722 .mode = 0644,
6d456111 1723 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1724 .extra1 = &minolduid,
1725 .extra2 = &maxolduid,
1726 },
bfcd17a6 1727#ifdef CONFIG_FILE_LOCKING
1da177e4 1728 {
1da177e4
LT		 1729 .procname = "leases-enable",
1730 .data = &leases_enable,
1731 .maxlen = sizeof(int),
1732 .mode = 0644,
6d456111 1733 .proc_handler = proc_dointvec,
1da177e4 1734 },
bfcd17a6 1735#endif
1da177e4
LT		 1736#ifdef CONFIG_DNOTIFY
1737 {
1da177e4
LT		 1738 .procname = "dir-notify-enable",
1739 .data = &dir_notify_enable,
1740 .maxlen = sizeof(int),
1741 .mode = 0644,
6d456111 1742 .proc_handler = proc_dointvec,
1da177e4
LT		 1743 },
1744#endif
1745#ifdef CONFIG_MMU
bfcd17a6 1746#ifdef CONFIG_FILE_LOCKING
1da177e4 1747 {
1da177e4
LT		 1748 .procname = "lease-break-time",
1749 .data = &lease_break_time,
1750 .maxlen = sizeof(int),
1751 .mode = 0644,
6d456111 1752 .proc_handler = proc_dointvec,
1da177e4 1753 },
bfcd17a6 1754#endif
ebf3f09c 1755#ifdef CONFIG_AIO
1da177e4 1756 {
1da177e4
LT		 1757 .procname = "aio-nr",
1758 .data = &aio_nr,
1759 .maxlen = sizeof(aio_nr),
1760 .mode = 0444,
6d456111 1761 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1762 },
1763 {
1da177e4
LT		 1764 .procname = "aio-max-nr",
1765 .data = &aio_max_nr,
1766 .maxlen = sizeof(aio_max_nr),
1767 .mode = 0644,
6d456111 1768 .proc_handler = proc_doulongvec_minmax,
1da177e4 1769 },
ebf3f09c 1770#endif /* CONFIG_AIO */
2d9048e2 1771#ifdef CONFIG_INOTIFY_USER
0399cb08 1772 {
0399cb08
RL		 1773 .procname = "inotify",
1774 .mode = 0555,
1775 .child = inotify_table,
1776 },
1777#endif
7ef9964e
DL		 1778#ifdef CONFIG_EPOLL
1779 {
1780 .procname = "epoll",
1781 .mode = 0555,
1782 .child = epoll_table,
1783 },
1784#endif
1da177e4 1785#endif
800179c9
KC		 1786 {
1787 .procname = "protected_symlinks",
1788 .data = &sysctl_protected_symlinks,
1789 .maxlen = sizeof(int),
1790 .mode = 0600,
1791 .proc_handler = proc_dointvec_minmax,
1792 .extra1 = &zero,
1793 .extra2 = &one,
1794 },
1795 {
1796 .procname = "protected_hardlinks",
1797 .data = &sysctl_protected_hardlinks,
1798 .maxlen = sizeof(int),
1799 .mode = 0600,
1800 .proc_handler = proc_dointvec_minmax,
1801 .extra1 = &zero,
1802 .extra2 = &one,
1803 },
d6e71144 1804 {
d6e71144
AC		 1805 .procname = "suid_dumpable",
1806 .data = &suid_dumpable,
1807 .maxlen = sizeof(int),
1808 .mode = 0644,
54b50199 1809 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1810 .extra1 = &zero,
1811 .extra2 = &two,
d6e71144 1812 },
2abc26fc
EB		 1813#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1814 {
2abc26fc
EB		 1815 .procname = "binfmt_misc",
1816 .mode = 0555,
f9bd6733 1817 .child = sysctl_mount_point,
2abc26fc
EB		 1818 },
1819#endif
b492e95b 1820 {
ff9da691
JA		 1821 .procname = "pipe-max-size",
1822 .data = &pipe_max_size,
b492e95b
JA		 1823 .maxlen = sizeof(int),
1824 .mode = 0644,
ff9da691
JA		 1825 .proc_handler = &pipe_proc_fn,
1826 .extra1 = &pipe_min_size,
b492e95b 1827 },
759c0114
WT		 1828 {
1829 .procname = "pipe-user-pages-hard",
1830 .data = &pipe_user_pages_hard,
1831 .maxlen = sizeof(pipe_user_pages_hard),
1832 .mode = 0644,
1833 .proc_handler = proc_doulongvec_minmax,
1834 },
1835 {
1836 .procname = "pipe-user-pages-soft",
1837 .data = &pipe_user_pages_soft,
1838 .maxlen = sizeof(pipe_user_pages_soft),
1839 .mode = 0644,
1840 .proc_handler = proc_doulongvec_minmax,
1841 },
d2921684
EB		 1842 {
1843 .procname = "mount-max",
1844 .data = &sysctl_mount_max,
1845 .maxlen = sizeof(unsigned int),
1846 .mode = 0644,
1847 .proc_handler = proc_dointvec_minmax,
1848 .extra1 = &one,
1849 },
6fce56ec 1850 { }
1da177e4
LT		 1851};
1852
d8217f07 1853static struct ctl_table debug_table[] = {
7ac57a89 1854#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1855 {
abd4f750
MAS		 1856 .procname = "exception-trace",
1857 .data = &show_unhandled_signals,
1858 .maxlen = sizeof(int),
1859 .mode = 0644,
1860 .proc_handler = proc_dointvec
1861 },
b2be84df
MH		 1862#endif
1863#if defined(CONFIG_OPTPROBES)
1864 {
1865 .procname = "kprobes-optimization",
1866 .data = &sysctl_kprobes_optimization,
1867 .maxlen = sizeof(int),
1868 .mode = 0644,
1869 .proc_handler = proc_kprobes_optimization_handler,
1870 .extra1 = &zero,
1871 .extra2 = &one,
1872 },
abd4f750 1873#endif
6fce56ec 1874 { }
1da177e4
LT		 1875};
1876
d8217f07 1877static struct ctl_table dev_table[] = {
6fce56ec 1878 { }
0eeca283 1879};
1da177e4 1880
de4e83bd 1881int __init sysctl_init(void)
d912b0cc 1882{
fd4b616b
SR		 1883 struct ctl_table_header *hdr;
1884
1885 hdr = register_sysctl_table(sysctl_base_table);
1886 kmemleak_not_leak(hdr);
d912b0cc
EB		 1887 return 0;
1888}
1889
b89a8171
EB		 1890#endif /* CONFIG_SYSCTL */
1891
1da177e4
LT		 1892/*
1893 * /proc/sys support
1894 */
1895
b89a8171 1896#ifdef CONFIG_PROC_SYSCTL
1da177e4 1897
f8808300
KC		 1898static int _proc_do_string(char *data, int maxlen, int write,
1899 char __user *buffer,
b1ba4ddd 1900 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1901{
1902 size_t len;
1903 char __user *p;
1904 char c;
8d060877
ON		 1905
1906 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1907 *lenp = 0;
1908 return 0;
1909 }
8d060877 1910
1da177e4 1911 if (write) {
f4aacea2
KC		 1912 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1913 /* Only continue writes not past the end of buffer. */
1914 len = strlen(data);
1915 if (len > maxlen - 1)
1916 len = maxlen - 1;
1917
1918 if (*ppos > len)
1919 return 0;
1920 len = *ppos;
1921 } else {
1922 /* Start writing from beginning of buffer. */
1923 len = 0;
1924 }
1925
2ca9bb45 1926 *ppos += *lenp;
1da177e4 1927 p = buffer;
2ca9bb45 1928 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1929 if (get_user(c, p++))
1930 return -EFAULT;
1931 if (c == 0 || c == '\n')
1932 break;
2ca9bb45 1933 data[len++] = c;
1da177e4 1934 }
f8808300 1935 data[len] = 0;
1da177e4 1936 } else {
f5dd3d6f
SV		 1937 len = strlen(data);
1938 if (len > maxlen)
1939 len = maxlen;
8d060877
ON		 1940
1941 if (*ppos > len) {
1942 *lenp = 0;
1943 return 0;
1944 }
1945
1946 data += *ppos;
1947 len -= *ppos;
1948
1da177e4
LT		 1949 if (len > *lenp)
1950 len = *lenp;
1951 if (len)
f8808300 1952 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1953 return -EFAULT;
1954 if (len < *lenp) {
f8808300 1955 if (put_user('\n', buffer + len))
1da177e4
LT		 1956 return -EFAULT;
1957 len++;
1958 }
1959 *lenp = len;
1960 *ppos += len;
1961 }
1962 return 0;
1963}
1964
f4aacea2
KC		 1965static void warn_sysctl_write(struct ctl_table *table)
1966{
1967 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1968 "This will not be supported in the future. To silence this\n"
1969 "warning, set kernel.sysctl_writes_strict = -1\n",
1970 current->comm, table->procname);
1971}
1972
f5dd3d6f
SV		 1973/**
1974 * proc_dostring - read a string sysctl
1975 * @table: the sysctl table
1976 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 1977 * @buffer: the user buffer
1978 * @lenp: the size of the user buffer
1979 * @ppos: file position
1980 *
1981 * Reads/writes a string from/to the user buffer. If the kernel
1982 * buffer provided is not large enough to hold the string, the
1983 * string is truncated. The copied string is %NULL-terminated.
1984 * If the string is being read by the user process, it is copied
1985 * and a newline '\n' is added. It is truncated if the buffer is
1986 * not large enough.
1987 *
1988 * Returns 0 on success.
1989 */
8d65af78 1990int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 1991 void __user *buffer, size_t *lenp, loff_t *ppos)
1992{
f4aacea2
KC		 1993 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1994 warn_sysctl_write(table);
1995
f8808300
KC		 1996 return _proc_do_string((char *)(table->data), table->maxlen, write,
1997 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 1998}
1999
00b7c339
AW		 2000static size_t proc_skip_spaces(char **buf)
2001{
2002 size_t ret;
2003 char *tmp = skip_spaces(*buf);
2004 ret = tmp - *buf;
2005 *buf = tmp;
2006 return ret;
2007}
2008
9f977fb7
OP		 2009static void proc_skip_char(char **buf, size_t *size, const char v)
2010{
2011 while (*size) {
2012 if (**buf != v)
2013 break;
2014 (*size)--;
2015 (*buf)++;
2016 }
2017}
2018
00b7c339
AW		 2019#define TMPBUFLEN 22
2020/**
0fc377bd 2021 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2022 *
0fc377bd
RD		 2023 * @buf: a kernel buffer
2024 * @size: size of the kernel buffer
2025 * @val: this is where the number will be stored
2026 * @neg: set to %TRUE if number is negative
2027 * @perm_tr: a vector which contains the allowed trailers
2028 * @perm_tr_len: size of the perm_tr vector
2029 * @tr: pointer to store the trailer character
00b7c339 2030 *
0fc377bd
RD		 2031 * In case of success %0 is returned and @buf and @size are updated with
2032 * the amount of bytes read. If @tr is non-NULL and a trailing
2033 * character exists (size is non-zero after returning from this
2034 * function), @tr is updated with the trailing character.
00b7c339
AW		 2035 */
2036static int proc_get_long(char **buf, size_t *size,
2037 unsigned long *val, bool *neg,
2038 const char *perm_tr, unsigned perm_tr_len, char *tr)
2039{
2040 int len;
2041 char *p, tmp[TMPBUFLEN];
2042
2043 if (!*size)
2044 return -EINVAL;
2045
2046 len = *size;
2047 if (len > TMPBUFLEN - 1)
2048 len = TMPBUFLEN - 1;
2049
2050 memcpy(tmp, *buf, len);
2051
2052 tmp[len] = 0;
2053 p = tmp;
2054 if (*p == '-' && *size > 1) {
2055 *neg = true;
2056 p++;
2057 } else
2058 *neg = false;
2059 if (!isdigit(*p))
2060 return -EINVAL;
2061
2062 *val = simple_strtoul(p, &p, 0);
2063
2064 len = p - tmp;
2065
2066 /* We don't know if the next char is whitespace thus we may accept
2067 * invalid integers (e.g. 1234...a) or two integers instead of one
2068 * (e.g. 123...1). So lets not allow such large numbers. */
2069 if (len == TMPBUFLEN - 1)
2070 return -EINVAL;
2071
2072 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2073 return -EINVAL;
1da177e4 2074
00b7c339
AW		 2075 if (tr && (len < *size))
2076 *tr = *p;
2077
2078 *buf += len;
2079 *size -= len;
2080
2081 return 0;
2082}
2083
2084/**
0fc377bd 2085 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2086 *
0fc377bd
RD		 2087 * @buf: the user buffer
2088 * @size: the size of the user buffer
2089 * @val: the integer to be converted
2090 * @neg: sign of the number, %TRUE for negative
00b7c339 2091 *
0fc377bd
RD		 2092 * In case of success %0 is returned and @buf and @size are updated with
2093 * the amount of bytes written.
00b7c339
AW		 2094 */
2095static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2096 bool neg)
2097{
2098 int len;
2099 char tmp[TMPBUFLEN], *p = tmp;
2100
2101 sprintf(p, "%s%lu", neg ? "-" : "", val);
2102 len = strlen(tmp);
2103 if (len > *size)
2104 len = *size;
2105 if (copy_to_user(*buf, tmp, len))
2106 return -EFAULT;
2107 *size -= len;
2108 *buf += len;
2109 return 0;
2110}
2111#undef TMPBUFLEN
2112
2113static int proc_put_char(void __user **buf, size_t *size, char c)
2114{
2115 if (*size) {
2116 char __user **buffer = (char __user **)buf;
2117 if (put_user(c, *buffer))
2118 return -EFAULT;
2119 (*size)--, (*buffer)++;
2120 *buf = *buffer;
2121 }
2122 return 0;
2123}
1da177e4 2124
00b7c339 2125static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2126 int *valp,
2127 int write, void *data)
2128{
2129 if (write) {
230633d1
HS		 2130 if (*negp) {
2131 if (*lvalp > (unsigned long) INT_MAX + 1)
2132 return -EINVAL;
2133 *valp = -*lvalp;
2134 } else {
2135 if (*lvalp > (unsigned long) INT_MAX)
2136 return -EINVAL;
2137 *valp = *lvalp;
2138 }
1da177e4
LT		 2139 } else {
2140 int val = *valp;
2141 if (val < 0) {
00b7c339 2142 *negp = true;
9a5bc726 2143 *lvalp = -(unsigned long)val;
1da177e4 2144 } else {
00b7c339 2145 *negp = false;
1da177e4
LT		 2146 *lvalp = (unsigned long)val;
2147 }
2148 }
2149 return 0;
2150}
2151
e7d316a0
SAK		 2152static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2153 int *valp,
2154 int write, void *data)
2155{
2156 if (write) {
2157 if (*negp)
2158 return -EINVAL;
2159 *valp = *lvalp;
2160 } else {
2161 unsigned int val = *valp;
2162 *lvalp = (unsigned long)val;
2163 }
2164 return 0;
2165}
2166
00b7c339
AW		 2167static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2168
d8217f07 2169static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2170 int write, void __user *buffer,
fcfbd547 2171 size_t *lenp, loff_t *ppos,
00b7c339 2172 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2173 int write, void *data),
2174 void *data)
2175{
00b7c339 2176 int *i, vleft, first = 1, err = 0;
00b7c339 2177 size_t left;
70f6cbb6 2178 char *kbuf = NULL, *p;
1da177e4 2179
00b7c339 2180 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2181 *lenp = 0;
2182 return 0;
2183 }
2184
fcfbd547 2185 i = (int *) tbl_data;
1da177e4
LT		 2186 vleft = table->maxlen / sizeof(*i);
2187 left = *lenp;
2188
2189 if (!conv)
2190 conv = do_proc_dointvec_conv;
2191
00b7c339 2192 if (write) {
f4aacea2
KC		 2193 if (*ppos) {
2194 switch (sysctl_writes_strict) {
2195 case SYSCTL_WRITES_STRICT:
2196 goto out;
2197 case SYSCTL_WRITES_WARN:
2198 warn_sysctl_write(table);
2199 break;
2200 default:
2201 break;
2202 }
2203 }
2204
00b7c339
AW		 2205 if (left > PAGE_SIZE - 1)
2206 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2207 p = kbuf = memdup_user_nul(buffer, left);
2208 if (IS_ERR(kbuf))
2209 return PTR_ERR(kbuf);
00b7c339
AW		 2210 }
2211
1da177e4 2212 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2213 unsigned long lval;
2214 bool neg;
1da177e4 2215
00b7c339 2216 if (write) {
70f6cbb6 2217 left -= proc_skip_spaces(&p);
1da177e4 2218
563b0467
O		 2219 if (!left)
2220 break;
70f6cbb6 2221 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2222 proc_wspace_sep,
2223 sizeof(proc_wspace_sep), NULL);
2224 if (err)
1da177e4 2225 break;
00b7c339
AW		 2226 if (conv(&neg, &lval, i, 1, data)) {
2227 err = -EINVAL;
1da177e4 2228 break;
00b7c339 2229 }
1da177e4 2230 } else {
00b7c339
AW		 2231 if (conv(&neg, &lval, i, 0, data)) {
2232 err = -EINVAL;
2233 break;
2234 }
1da177e4 2235 if (!first)
00b7c339
AW		 2236 err = proc_put_char(&buffer, &left, '\t');
2237 if (err)
2238 break;
2239 err = proc_put_long(&buffer, &left, lval, neg);
2240 if (err)
1da177e4 2241 break;
1da177e4
LT		 2242 }
2243 }
2244
00b7c339
AW		 2245 if (!write && !first && left && !err)
2246 err = proc_put_char(&buffer, &left, '\n');
563b0467 2247 if (write && !err && left)
70f6cbb6 2248 left -= proc_skip_spaces(&p);
1da177e4 2249 if (write) {
70f6cbb6 2250 kfree(kbuf);
00b7c339
AW		 2251 if (first)
2252 return err ? : -EINVAL;
1da177e4 2253 }
1da177e4 2254 *lenp -= left;
f4aacea2 2255out:
1da177e4 2256 *ppos += *lenp;
00b7c339 2257 return err;
1da177e4
LT		 2258}
2259
8d65af78 2260static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2261 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2262 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2263 int write, void *data),
2264 void *data)
2265{
8d65af78 2266 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2267 buffer, lenp, ppos, conv, data);
2268}
2269
1da177e4
LT		 2270/**
2271 * proc_dointvec - read a vector of integers
2272 * @table: the sysctl table
2273 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2274 * @buffer: the user buffer
2275 * @lenp: the size of the user buffer
2276 * @ppos: file position
2277 *
2278 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2279 * values from/to the user buffer, treated as an ASCII string.
2280 *
2281 * Returns 0 on success.
2282 */
8d65af78 2283int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2284 void __user *buffer, size_t *lenp, loff_t *ppos)
2285{
e7d316a0
SAK		 2286 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2287}
2288
2289/**
2290 * proc_douintvec - read a vector of unsigned integers
2291 * @table: the sysctl table
2292 * @write: %TRUE if this is a write to the sysctl file
2293 * @buffer: the user buffer
2294 * @lenp: the size of the user buffer
2295 * @ppos: file position
2296 *
2297 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2298 * values from/to the user buffer, treated as an ASCII string.
2299 *
2300 * Returns 0 on success.
2301 */
2302int proc_douintvec(struct ctl_table *table, int write,
2303 void __user *buffer, size_t *lenp, loff_t *ppos)
2304{
2305 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2306 do_proc_douintvec_conv, NULL);
1da177e4
LT		 2307}
2308
34f5a398 2309/*
25ddbb18
AK		 2310 * Taint values can only be increased
2311 * This means we can safely use a temporary.
34f5a398 2312 */
8d65af78 2313static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2314 void __user *buffer, size_t *lenp, loff_t *ppos)
2315{
25ddbb18
AK		 2316 struct ctl_table t;
2317 unsigned long tmptaint = get_taint();
2318 int err;
34f5a398 2319
91fcd412 2320 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2321 return -EPERM;
2322
25ddbb18
AK		 2323 t = *table;
2324 t.data = &tmptaint;
8d65af78 2325 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2326 if (err < 0)
2327 return err;
2328
2329 if (write) {
2330 /*
2331 * Poor man's atomic or. Not worth adding a primitive
2332 * to everyone's atomic.h for this
2333 */
2334 int i;
2335 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2336 if ((tmptaint >> i) & 1)
373d4d09 2337 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2338 }
2339 }
2340
2341 return err;
34f5a398
TT		 2342}
2343
bfdc0b49 2344#ifdef CONFIG_PRINTK
620f6e8e 2345static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2346 void __user *buffer, size_t *lenp, loff_t *ppos)
2347{
2348 if (write && !capable(CAP_SYS_ADMIN))
2349 return -EPERM;
2350
2351 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2352}
2353#endif
2354
1da177e4
LT		 2355struct do_proc_dointvec_minmax_conv_param {
2356 int *min;
2357 int *max;
2358};
2359
00b7c339
AW		 2360static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2361 int *valp,
1da177e4
LT		 2362 int write, void *data)
2363{
2364 struct do_proc_dointvec_minmax_conv_param *param = data;
2365 if (write) {
2366 int val = *negp ? -*lvalp : *lvalp;
2367 if ((param->min && *param->min > val) ||
2368 (param->max && *param->max < val))
2369 return -EINVAL;
2370 *valp = val;
2371 } else {
2372 int val = *valp;
2373 if (val < 0) {
00b7c339 2374 *negp = true;
9a5bc726 2375 *lvalp = -(unsigned long)val;
1da177e4 2376 } else {
00b7c339 2377 *negp = false;
1da177e4
LT		 2378 *lvalp = (unsigned long)val;
2379 }
2380 }
2381 return 0;
2382}
2383
2384/**
2385 * proc_dointvec_minmax - read a vector of integers with min/max values
2386 * @table: the sysctl table
2387 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2388 * @buffer: the user buffer
2389 * @lenp: the size of the user buffer
2390 * @ppos: file position
2391 *
2392 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2393 * values from/to the user buffer, treated as an ASCII string.
2394 *
2395 * This routine will ensure the values are within the range specified by
2396 * table->extra1 (min) and table->extra2 (max).
2397 *
2398 * Returns 0 on success.
2399 */
8d65af78 2400int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2401 void __user *buffer, size_t *lenp, loff_t *ppos)
2402{
2403 struct do_proc_dointvec_minmax_conv_param param = {
2404 .min = (int *) table->extra1,
2405 .max = (int *) table->extra2,
2406 };
8d65af78 2407 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2408 do_proc_dointvec_minmax_conv, &param);
2409}
2410
54b50199
KC		 2411static void validate_coredump_safety(void)
2412{
046d662f 2413#ifdef CONFIG_COREDUMP
e579d2c2 2414 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199
KC		 2415 core_pattern[0] != '/' && core_pattern[0] != '|') {
2416 printk(KERN_WARNING "Unsafe core_pattern used with "\
2417 "suid_dumpable=2. Pipe handler or fully qualified "\
2418 "core dump path required.\n");
2419 }
046d662f 2420#endif
54b50199
KC		 2421}
2422
2423static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2424 void __user *buffer, size_t *lenp, loff_t *ppos)
2425{
2426 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2427 if (!error)
2428 validate_coredump_safety();
2429 return error;
2430}
2431
046d662f 2432#ifdef CONFIG_COREDUMP
54b50199
KC		 2433static int proc_dostring_coredump(struct ctl_table *table, int write,
2434 void __user *buffer, size_t *lenp, loff_t *ppos)
2435{
2436 int error = proc_dostring(table, write, buffer, lenp, ppos);
2437 if (!error)
2438 validate_coredump_safety();
2439 return error;
2440}
046d662f 2441#endif
54b50199 2442
d8217f07 2443static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2444 void __user *buffer,
2445 size_t *lenp, loff_t *ppos,
2446 unsigned long convmul,
2447 unsigned long convdiv)
2448{
00b7c339
AW		 2449 unsigned long *i, *min, *max;
2450 int vleft, first = 1, err = 0;
00b7c339 2451 size_t left;
70f6cbb6 2452 char *kbuf = NULL, *p;
00b7c339
AW		 2453
2454 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2455 *lenp = 0;
2456 return 0;
2457 }
00b7c339 2458
fcfbd547 2459 i = (unsigned long *) data;
1da177e4
LT		 2460 min = (unsigned long *) table->extra1;
2461 max = (unsigned long *) table->extra2;
2462 vleft = table->maxlen / sizeof(unsigned long);
2463 left = *lenp;
00b7c339
AW		 2464
2465 if (write) {
f4aacea2
KC		 2466 if (*ppos) {
2467 switch (sysctl_writes_strict) {
2468 case SYSCTL_WRITES_STRICT:
2469 goto out;
2470 case SYSCTL_WRITES_WARN:
2471 warn_sysctl_write(table);
2472 break;
2473 default:
2474 break;
2475 }
2476 }
2477
00b7c339
AW		 2478 if (left > PAGE_SIZE - 1)
2479 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2480 p = kbuf = memdup_user_nul(buffer, left);
2481 if (IS_ERR(kbuf))
2482 return PTR_ERR(kbuf);
00b7c339
AW		 2483 }
2484
27b3d80a 2485 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2486 unsigned long val;
2487
1da177e4 2488 if (write) {
00b7c339
AW		 2489 bool neg;
2490
70f6cbb6 2491 left -= proc_skip_spaces(&p);
00b7c339 2492
70f6cbb6 2493 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2494 proc_wspace_sep,
2495 sizeof(proc_wspace_sep), NULL);
2496 if (err)
1da177e4
LT		 2497 break;
2498 if (neg)
1da177e4
LT		 2499 continue;
2500 if ((min && val < *min) || (max && val > *max))
2501 continue;
2502 *i = val;
2503 } else {
00b7c339 2504 val = convdiv * (*i) / convmul;
7833819d 2505 if (!first) {
00b7c339 2506 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2507 if (err)
2508 break;
2509 }
00b7c339
AW		 2510 err = proc_put_long(&buffer, &left, val, false);
2511 if (err)
2512 break;
1da177e4
LT		 2513 }
2514 }
2515
00b7c339
AW		 2516 if (!write && !first && left && !err)
2517 err = proc_put_char(&buffer, &left, '\n');
2518 if (write && !err)
70f6cbb6 2519 left -= proc_skip_spaces(&p);
1da177e4 2520 if (write) {
70f6cbb6 2521 kfree(kbuf);
00b7c339
AW		 2522 if (first)
2523 return err ? : -EINVAL;
1da177e4 2524 }
1da177e4 2525 *lenp -= left;
f4aacea2 2526out:
1da177e4 2527 *ppos += *lenp;
00b7c339 2528 return err;
1da177e4
LT		 2529}
2530
d8217f07 2531static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2532 void __user *buffer,
2533 size_t *lenp, loff_t *ppos,
2534 unsigned long convmul,
2535 unsigned long convdiv)
2536{
2537 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2538 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2539}
2540
1da177e4
LT		 2541/**
2542 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2543 * @table: the sysctl table
2544 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2545 * @buffer: the user buffer
2546 * @lenp: the size of the user buffer
2547 * @ppos: file position
2548 *
2549 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2550 * values from/to the user buffer, treated as an ASCII string.
2551 *
2552 * This routine will ensure the values are within the range specified by
2553 * table->extra1 (min) and table->extra2 (max).
2554 *
2555 * Returns 0 on success.
2556 */
8d65af78 2557int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2558 void __user *buffer, size_t *lenp, loff_t *ppos)
2559{
8d65af78 2560 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2561}
2562
2563/**
2564 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2565 * @table: the sysctl table
2566 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2567 * @buffer: the user buffer
2568 * @lenp: the size of the user buffer
2569 * @ppos: file position
2570 *
2571 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2572 * values from/to the user buffer, treated as an ASCII string. The values
2573 * are treated as milliseconds, and converted to jiffies when they are stored.
2574 *
2575 * This routine will ensure the values are within the range specified by
2576 * table->extra1 (min) and table->extra2 (max).
2577 *
2578 * Returns 0 on success.
2579 */
d8217f07 2580int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2581 void __user *buffer,
2582 size_t *lenp, loff_t *ppos)
2583{
8d65af78 2584 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2585 lenp, ppos, HZ, 1000l);
2586}
2587
2588
00b7c339 2589static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2590 int *valp,
2591 int write, void *data)
2592{
2593 if (write) {
cba9f33d
BS		 2594 if (*lvalp > LONG_MAX / HZ)
2595 return 1;
1da177e4
LT		 2596 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2597 } else {
2598 int val = *valp;
2599 unsigned long lval;
2600 if (val < 0) {
00b7c339 2601 *negp = true;
9a5bc726 2602 lval = -(unsigned long)val;
1da177e4 2603 } else {
00b7c339 2604 *negp = false;
1da177e4
LT		 2605 lval = (unsigned long)val;
2606 }
2607 *lvalp = lval / HZ;
2608 }
2609 return 0;
2610}
2611
00b7c339 2612static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2613 int *valp,
2614 int write, void *data)
2615{
2616 if (write) {
cba9f33d
BS		 2617 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2618 return 1;
1da177e4
LT		 2619 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2620 } else {
2621 int val = *valp;
2622 unsigned long lval;
2623 if (val < 0) {
00b7c339 2624 *negp = true;
9a5bc726 2625 lval = -(unsigned long)val;
1da177e4 2626 } else {
00b7c339 2627 *negp = false;
1da177e4
LT		 2628 lval = (unsigned long)val;
2629 }
2630 *lvalp = jiffies_to_clock_t(lval);
2631 }
2632 return 0;
2633}
2634
00b7c339 2635static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2636 int *valp,
2637 int write, void *data)
2638{
2639 if (write) {
d738ce8f
FF		 2640 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2641
2642 if (jif > INT_MAX)
2643 return 1;
2644 *valp = (int)jif;
1da177e4
LT		 2645 } else {
2646 int val = *valp;
2647 unsigned long lval;
2648 if (val < 0) {
00b7c339 2649 *negp = true;
9a5bc726 2650 lval = -(unsigned long)val;
1da177e4 2651 } else {
00b7c339 2652 *negp = false;
1da177e4
LT		 2653 lval = (unsigned long)val;
2654 }
2655 *lvalp = jiffies_to_msecs(lval);
2656 }
2657 return 0;
2658}
2659
2660/**
2661 * proc_dointvec_jiffies - read a vector of integers as seconds
2662 * @table: the sysctl table
2663 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 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 int) integer
2669 * values from/to the user buffer, treated as an ASCII string.
2670 * The values read are assumed to be in seconds, and are converted into
2671 * jiffies.
2672 *
2673 * Returns 0 on success.
2674 */
8d65af78 2675int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2676 void __user *buffer, size_t *lenp, loff_t *ppos)
2677{
8d65af78 2678 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2679 do_proc_dointvec_jiffies_conv,NULL);
2680}
2681
2682/**
2683 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2684 * @table: the sysctl table
2685 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2686 * @buffer: the user buffer
2687 * @lenp: the size of the user buffer
1e5d5331 2688 * @ppos: pointer to the file position
1da177e4
LT		 2689 *
2690 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2691 * values from/to the user buffer, treated as an ASCII string.
2692 * The values read are assumed to be in 1/USER_HZ seconds, and
2693 * are converted into jiffies.
2694 *
2695 * Returns 0 on success.
2696 */
8d65af78 2697int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2698 void __user *buffer, size_t *lenp, loff_t *ppos)
2699{
8d65af78 2700 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2701 do_proc_dointvec_userhz_jiffies_conv,NULL);
2702}
2703
2704/**
2705 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2706 * @table: the sysctl table
2707 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2708 * @buffer: the user buffer
2709 * @lenp: the size of the user buffer
67be2dd1
MW		 2710 * @ppos: file position
2711 * @ppos: the current position in the file
1da177e4
LT		 2712 *
2713 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2714 * values from/to the user buffer, treated as an ASCII string.
2715 * The values read are assumed to be in 1/1000 seconds, and
2716 * are converted into jiffies.
2717 *
2718 * Returns 0 on success.
2719 */
8d65af78 2720int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2721 void __user *buffer, size_t *lenp, loff_t *ppos)
2722{
8d65af78 2723 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2724 do_proc_dointvec_ms_jiffies_conv, NULL);
2725}
2726
8d65af78 2727static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2728 void __user *buffer, size_t *lenp, loff_t *ppos)
2729{
2730 struct pid *new_pid;
2731 pid_t tmp;
2732 int r;
2733
6c5f3e7b 2734 tmp = pid_vnr(cad_pid);
9ec52099 2735
8d65af78 2736 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2737 lenp, ppos, NULL, NULL);
2738 if (r || !write)
2739 return r;
2740
2741 new_pid = find_get_pid(tmp);
2742 if (!new_pid)
2743 return -ESRCH;
2744
2745 put_pid(xchg(&cad_pid, new_pid));
2746 return 0;
2747}
2748
9f977fb7
OP		 2749/**
2750 * proc_do_large_bitmap - read/write from/to a large bitmap
2751 * @table: the sysctl table
2752 * @write: %TRUE if this is a write to the sysctl file
2753 * @buffer: the user buffer
2754 * @lenp: the size of the user buffer
2755 * @ppos: file position
2756 *
2757 * The bitmap is stored at table->data and the bitmap length (in bits)
2758 * in table->maxlen.
2759 *
2760 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2761 * large bitmaps may be represented in a compact manner. Writing into
2762 * the file will clear the bitmap then update it with the given input.
2763 *
2764 * Returns 0 on success.
2765 */
2766int proc_do_large_bitmap(struct ctl_table *table, int write,
2767 void __user *buffer, size_t *lenp, loff_t *ppos)
2768{
2769 int err = 0;
2770 bool first = 1;
2771 size_t left = *lenp;
2772 unsigned long bitmap_len = table->maxlen;
122ff243 2773 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2774 unsigned long *tmp_bitmap = NULL;
2775 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2776
122ff243 2777 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2778 *lenp = 0;
2779 return 0;
2780 }
2781
2782 if (write) {
70f6cbb6 2783 char *kbuf, *p;
9f977fb7
OP		 2784
2785 if (left > PAGE_SIZE - 1)
2786 left = PAGE_SIZE - 1;
2787
70f6cbb6
AV		 2788 p = kbuf = memdup_user_nul(buffer, left);
2789 if (IS_ERR(kbuf))
2790 return PTR_ERR(kbuf);
9f977fb7
OP		 2791
2792 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2793 GFP_KERNEL);
2794 if (!tmp_bitmap) {
70f6cbb6 2795 kfree(kbuf);
9f977fb7
OP		 2796 return -ENOMEM;
2797 }
70f6cbb6 2798 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 2799 while (!err && left) {
2800 unsigned long val_a, val_b;
2801 bool neg;
2802
70f6cbb6 2803 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 2804 sizeof(tr_a), &c);
2805 if (err)
2806 break;
2807 if (val_a >= bitmap_len || neg) {
2808 err = -EINVAL;
2809 break;
2810 }
2811
2812 val_b = val_a;
2813 if (left) {
70f6cbb6 2814 p++;
9f977fb7
OP		 2815 left--;
2816 }
2817
2818 if (c == '-') {
70f6cbb6 2819 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 2820 &neg, tr_b, sizeof(tr_b),
2821 &c);
2822 if (err)
2823 break;
2824 if (val_b >= bitmap_len || neg ||
2825 val_a > val_b) {
2826 err = -EINVAL;
2827 break;
2828 }
2829 if (left) {
70f6cbb6 2830 p++;
9f977fb7
OP		 2831 left--;
2832 }
2833 }
2834
5a04cca6 2835 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 2836 first = 0;
70f6cbb6 2837 proc_skip_char(&p, &left, '\n');
9f977fb7 2838 }
70f6cbb6 2839 kfree(kbuf);
9f977fb7
OP		 2840 } else {
2841 unsigned long bit_a, bit_b = 0;
2842
2843 while (left) {
2844 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2845 if (bit_a >= bitmap_len)
2846 break;
2847 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2848 bit_a + 1) - 1;
2849
2850 if (!first) {
2851 err = proc_put_char(&buffer, &left, ',');
2852 if (err)
2853 break;
2854 }
2855 err = proc_put_long(&buffer, &left, bit_a, false);
2856 if (err)
2857 break;
2858 if (bit_a != bit_b) {
2859 err = proc_put_char(&buffer, &left, '-');
2860 if (err)
2861 break;
2862 err = proc_put_long(&buffer, &left, bit_b, false);
2863 if (err)
2864 break;
2865 }
2866
2867 first = 0; bit_b++;
2868 }
2869 if (!err)
2870 err = proc_put_char(&buffer, &left, '\n');
2871 }
2872
2873 if (!err) {
2874 if (write) {
2875 if (*ppos)
2876 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2877 else
5a04cca6 2878 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 2879 }
2880 kfree(tmp_bitmap);
2881 *lenp -= left;
2882 *ppos += *lenp;
2883 return 0;
2884 } else {
2885 kfree(tmp_bitmap);
2886 return err;
2887 }
2888}
2889
55610500 2890#else /* CONFIG_PROC_SYSCTL */
1da177e4 2891
8d65af78 2892int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2893 void __user *buffer, size_t *lenp, loff_t *ppos)
2894{
2895 return -ENOSYS;
2896}
2897
8d65af78 2898int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2899 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2900{
2901 return -ENOSYS;
2902}
2903
e7d316a0
SAK		 2904int proc_douintvec(struct ctl_table *table, int write,
2905 void __user *buffer, size_t *lenp, loff_t *ppos)
2906{
2907 return -ENOSYS;
2908}
2909
8d65af78 2910int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2911 void __user *buffer, size_t *lenp, loff_t *ppos)
2912{
2913 return -ENOSYS;
2914}
2915
8d65af78 2916int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2917 void __user *buffer, size_t *lenp, loff_t *ppos)
2918{
2919 return -ENOSYS;
2920}
2921
8d65af78 2922int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2923 void __user *buffer, size_t *lenp, loff_t *ppos)
2924{
2925 return -ENOSYS;
2926}
2927
8d65af78 2928int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2929 void __user *buffer, size_t *lenp, loff_t *ppos)
2930{
2931 return -ENOSYS;
2932}
2933
8d65af78 2934int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2935 void __user *buffer, size_t *lenp, loff_t *ppos)
2936{
2937 return -ENOSYS;
2938}
2939
d8217f07 2940int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2941 void __user *buffer,
2942 size_t *lenp, loff_t *ppos)
2943{
2944 return -ENOSYS;
2945}
2946
2947
55610500 2948#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2949
1da177e4
LT		 2950/*
2951 * No sense putting this after each symbol definition, twice,
2952 * exception granted :-)
2953 */
2954EXPORT_SYMBOL(proc_dointvec);
e7d316a0 2955EXPORT_SYMBOL(proc_douintvec);
1da177e4
LT		 2956EXPORT_SYMBOL(proc_dointvec_jiffies);
2957EXPORT_SYMBOL(proc_dointvec_minmax);
2958EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2959EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2960EXPORT_SYMBOL(proc_dostring);
2961EXPORT_SYMBOL(proc_doulongvec_minmax);
2962EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux 6.x block layer and io_uring tree(s)