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[linux-2.6-block.git] / kernel / sysctl.c
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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>
1da177e4
LT		 68
69#include <asm/uaccess.h>
70#include <asm/processor.h>
71
29cbc78b
AK		 72#ifdef CONFIG_X86
73#include <asm/nmi.h>
0741f4d2 74#include <asm/stacktrace.h>
6e7c4025 75#include <asm/io.h>
29cbc78b 76#endif
d550bbd4
DH		 77#ifdef CONFIG_SPARC
78#include <asm/setup.h>
79#endif
c55b7c3e
DY		 80#ifdef CONFIG_BSD_PROCESS_ACCT
81#include <linux/acct.h>
82#endif
4f0e056f
DY		 83#ifdef CONFIG_RT_MUTEXES
84#include <linux/rtmutex.h>
85#endif
2edf5e49
DY		 86#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
87#include <linux/lockdep.h>
88#endif
15485a46
DY		 89#ifdef CONFIG_CHR_DEV_SG
90#include <scsi/sg.h>
91#endif
29cbc78b 92
58687acb 93#ifdef CONFIG_LOCKUP_DETECTOR
504d7cf1
DZ		 94#include <linux/nmi.h>
95#endif
96
1da177e4
LT		 97#if defined(CONFIG_SYSCTL)
98
99/* External variables not in a header file. */
d6e71144 100extern int suid_dumpable;
046d662f
AK		 101#ifdef CONFIG_COREDUMP
102extern int core_uses_pid;
1da177e4 103extern char core_pattern[];
a293980c 104extern unsigned int core_pipe_limit;
046d662f 105#endif
1da177e4 106extern int pid_max;
1da177e4 107extern int pid_max_min, pid_max_max;
8ad4b1fb 108extern int percpu_pagelist_fraction;
bebfa101 109extern int compat_log;
9745512c 110extern int latencytop_enabled;
eceea0b3 111extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 112#ifndef CONFIG_MMU
113extern int sysctl_nr_trim_pages;
114#endif
1da177e4 115
c4f3b63f 116/* Constants used for minimum and maximum */
2508ce18 117#ifdef CONFIG_LOCKUP_DETECTOR
c4f3b63f
RT		 118static int sixty = 60;
119#endif
120
270750db
AT		 121static int __maybe_unused neg_one = -1;
122
c4f3b63f 123static int zero;
cd5f9a4c
LT		 124static int __maybe_unused one = 1;
125static int __maybe_unused two = 2;
5509a5d2 126static int __maybe_unused four = 4;
fc3501d4 127static unsigned long one_ul = 1;
c4f3b63f 128static int one_hundred = 100;
795ae7a0 129static int one_thousand = 1000;
af91322e
DY		 130#ifdef CONFIG_PRINTK
131static int ten_thousand = 10000;
132#endif
c5dfd78e
ACM		 133#ifdef CONFIG_PERF_EVENTS
134static int six_hundred_forty_kb = 640 * 1024;
135#endif
c4f3b63f 136
9e4a5bda
AR		 137/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
138static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
139
1da177e4
LT		 140/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
141static int maxolduid = 65535;
142static int minolduid;
143
144static int ngroups_max = NGROUPS_MAX;
73efc039 145static const int cap_last_cap = CAP_LAST_CAP;
1da177e4 146
80df2847
LH		 147/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
148#ifdef CONFIG_DETECT_HUNG_TASK
149static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
150#endif
151
d14f1729
DY		 152#ifdef CONFIG_INOTIFY_USER
153#include <linux/inotify.h>
154#endif
72c57ed5 155#ifdef CONFIG_SPARC
1da177e4
LT		 156#endif
157
158#ifdef __hppa__
159extern int pwrsw_enabled;
bf14e3b9
VG		 160#endif
161
162#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4
LT		 163extern int unaligned_enabled;
164#endif
1da177e4 165
d2b176ed 166#ifdef CONFIG_IA64
88fc241f 167extern int unaligned_dump_stack;
d2b176ed
JS		 168#endif
169
b6fca725
VG		 170#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
171extern int no_unaligned_warning;
172#endif
173
d6f8ff73 174#ifdef CONFIG_PROC_SYSCTL
f4aacea2
KC		 175
176#define SYSCTL_WRITES_LEGACY -1
177#define SYSCTL_WRITES_WARN 0
178#define SYSCTL_WRITES_STRICT 1
179
41662f5c 180static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
f4aacea2 181
8d65af78 182static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 183 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 184static int proc_taint(struct ctl_table *table, int write,
34f5a398 185 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 186#endif
9ec52099 187
bfdc0b49 188#ifdef CONFIG_PRINTK
620f6e8e 189static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 190 void __user *buffer, size_t *lenp, loff_t *ppos);
191#endif
192
54b50199
KC		 193static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
194 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 195#ifdef CONFIG_COREDUMP
54b50199
KC		 196static int proc_dostring_coredump(struct ctl_table *table, int write,
197 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 198#endif
54b50199 199
97f5f0cd 200#ifdef CONFIG_MAGIC_SYSRQ
8c6a98b2 201/* Note: sysrq code uses it's own private copy */
8eaede49 202static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
97f5f0cd 203
6f8fd1d7 204static int sysrq_sysctl_handler(struct ctl_table *table, int write,
97f5f0cd
DT		 205 void __user *buffer, size_t *lenp,
206 loff_t *ppos)
207{
208 int error;
209
210 error = proc_dointvec(table, write, buffer, lenp, ppos);
211 if (error)
212 return error;
213
214 if (write)
215 sysrq_toggle_support(__sysrq_enabled);
216
217 return 0;
218}
219
220#endif
221
d8217f07
EB		 222static struct ctl_table kern_table[];
223static struct ctl_table vm_table[];
224static struct ctl_table fs_table[];
225static struct ctl_table debug_table[];
226static struct ctl_table dev_table[];
227extern struct ctl_table random_table[];
7ef9964e
DL		 228#ifdef CONFIG_EPOLL
229extern struct ctl_table epoll_table[];
230#endif
1da177e4
LT		 231
232#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
233int sysctl_legacy_va_layout;
234#endif
235
1da177e4
LT		 236/* The default sysctl tables: */
237
de4e83bd 238static struct ctl_table sysctl_base_table[] = {
1da177e4 239 {
1da177e4
LT		 240 .procname = "kernel",
241 .mode = 0555,
242 .child = kern_table,
243 },
244 {
1da177e4
LT		 245 .procname = "vm",
246 .mode = 0555,
247 .child = vm_table,
248 },
1da177e4 249 {
1da177e4
LT		 250 .procname = "fs",
251 .mode = 0555,
252 .child = fs_table,
253 },
254 {
1da177e4
LT		 255 .procname = "debug",
256 .mode = 0555,
257 .child = debug_table,
258 },
259 {
1da177e4
LT		 260 .procname = "dev",
261 .mode = 0555,
262 .child = dev_table,
263 },
6fce56ec 264 { }
1da177e4
LT		 265};
266
77e54a1f 267#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 268static int min_sched_granularity_ns = 100000; /* 100 usecs */
269static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
270static int min_wakeup_granularity_ns; /* 0 usecs */
271static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
cbee9f88 272#ifdef CONFIG_SMP
1983a922
CE		 273static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
274static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
cbee9f88
PZ		 275#endif /* CONFIG_SMP */
276#endif /* CONFIG_SCHED_DEBUG */
77e54a1f 277
5e771905
MG		 278#ifdef CONFIG_COMPACTION
279static int min_extfrag_threshold;
280static int max_extfrag_threshold = 1000;
281#endif
282
d8217f07 283static struct ctl_table kern_table[] = {
2bba22c5 284 {
2bba22c5
MG		 285 .procname = "sched_child_runs_first",
286 .data = &sysctl_sched_child_runs_first,
287 .maxlen = sizeof(unsigned int),
288 .mode = 0644,
6d456111 289 .proc_handler = proc_dointvec,
2bba22c5 290 },
77e54a1f
IM		 291#ifdef CONFIG_SCHED_DEBUG
292 {
b2be5e96
PZ		 293 .procname = "sched_min_granularity_ns",
294 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
702a7c76 297 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 298 .extra1 = &min_sched_granularity_ns,
299 .extra2 = &max_sched_granularity_ns,
77e54a1f 300 },
21805085 301 {
21805085
PZ		 302 .procname = "sched_latency_ns",
303 .data = &sysctl_sched_latency,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
702a7c76 306 .proc_handler = sched_proc_update_handler,
21805085
PZ		 307 .extra1 = &min_sched_granularity_ns,
308 .extra2 = &max_sched_granularity_ns,
309 },
77e54a1f 310 {
77e54a1f
IM		 311 .procname = "sched_wakeup_granularity_ns",
312 .data = &sysctl_sched_wakeup_granularity,
313 .maxlen = sizeof(unsigned int),
314 .mode = 0644,
702a7c76 315 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 316 .extra1 = &min_wakeup_granularity_ns,
317 .extra2 = &max_wakeup_granularity_ns,
318 },
cbee9f88 319#ifdef CONFIG_SMP
1983a922 320 {
1983a922
CE		 321 .procname = "sched_tunable_scaling",
322 .data = &sysctl_sched_tunable_scaling,
323 .maxlen = sizeof(enum sched_tunable_scaling),
324 .mode = 0644,
702a7c76 325 .proc_handler = sched_proc_update_handler,
1983a922
CE		 326 .extra1 = &min_sched_tunable_scaling,
327 .extra2 = &max_sched_tunable_scaling,
2398f2c6 328 },
da84d961 329 {
d00535db 330 .procname = "sched_migration_cost_ns",
da84d961
IM		 331 .data = &sysctl_sched_migration_cost,
332 .maxlen = sizeof(unsigned int),
333 .mode = 0644,
6d456111 334 .proc_handler = proc_dointvec,
da84d961 335 },
b82d9fdd 336 {
b82d9fdd
PZ		 337 .procname = "sched_nr_migrate",
338 .data = &sysctl_sched_nr_migrate,
339 .maxlen = sizeof(unsigned int),
fa85ae24 340 .mode = 0644,
6d456111 341 .proc_handler = proc_dointvec,
fa85ae24 342 },
e9e9250b 343 {
d00535db 344 .procname = "sched_time_avg_ms",
e9e9250b
PZ		 345 .data = &sysctl_sched_time_avg,
346 .maxlen = sizeof(unsigned int),
347 .mode = 0644,
6d456111 348 .proc_handler = proc_dointvec,
e9e9250b 349 },
a7a4f8a7 350 {
d00535db 351 .procname = "sched_shares_window_ns",
a7a4f8a7
PT		 352 .data = &sysctl_sched_shares_window,
353 .maxlen = sizeof(unsigned int),
354 .mode = 0644,
355 .proc_handler = proc_dointvec,
356 },
cb251765
MG		 357#ifdef CONFIG_SCHEDSTATS
358 {
359 .procname = "sched_schedstats",
360 .data = NULL,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = sysctl_schedstats,
364 .extra1 = &zero,
365 .extra2 = &one,
366 },
367#endif /* CONFIG_SCHEDSTATS */
cbee9f88
PZ		 368#endif /* CONFIG_SMP */
369#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 370 {
371 .procname = "numa_balancing_scan_delay_ms",
372 .data = &sysctl_numa_balancing_scan_delay,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
cbee9f88
PZ		 377 {
378 .procname = "numa_balancing_scan_period_min_ms",
379 .data = &sysctl_numa_balancing_scan_period_min,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384 {
385 .procname = "numa_balancing_scan_period_max_ms",
386 .data = &sysctl_numa_balancing_scan_period_max,
387 .maxlen = sizeof(unsigned int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec,
390 },
6e5fb223
PZ		 391 {
392 .procname = "numa_balancing_scan_size_mb",
393 .data = &sysctl_numa_balancing_scan_size,
394 .maxlen = sizeof(unsigned int),
395 .mode = 0644,
64192658
KT		 396 .proc_handler = proc_dointvec_minmax,
397 .extra1 = &one,
6e5fb223 398 },
54a43d54
AK		 399 {
400 .procname = "numa_balancing",
401 .data = NULL, /* filled in by handler */
402 .maxlen = sizeof(unsigned int),
403 .mode = 0644,
404 .proc_handler = sysctl_numa_balancing,
405 .extra1 = &zero,
406 .extra2 = &one,
407 },
cbee9f88
PZ		 408#endif /* CONFIG_NUMA_BALANCING */
409#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 410 {
9f0c1e56
PZ		 411 .procname = "sched_rt_period_us",
412 .data = &sysctl_sched_rt_period,
413 .maxlen = sizeof(unsigned int),
414 .mode = 0644,
6d456111 415 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 416 },
417 {
9f0c1e56
PZ		 418 .procname = "sched_rt_runtime_us",
419 .data = &sysctl_sched_rt_runtime,
420 .maxlen = sizeof(int),
421 .mode = 0644,
6d456111 422 .proc_handler = sched_rt_handler,
9f0c1e56 423 },
ce0dbbbb
CW		 424 {
425 .procname = "sched_rr_timeslice_ms",
426 .data = &sched_rr_timeslice,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = sched_rr_handler,
430 },
5091faa4
MG		 431#ifdef CONFIG_SCHED_AUTOGROUP
432 {
433 .procname = "sched_autogroup_enabled",
434 .data = &sysctl_sched_autogroup_enabled,
435 .maxlen = sizeof(unsigned int),
436 .mode = 0644,
1747b21f 437 .proc_handler = proc_dointvec_minmax,
5091faa4
MG		 438 .extra1 = &zero,
439 .extra2 = &one,
440 },
441#endif
ec12cb7f
PT		 442#ifdef CONFIG_CFS_BANDWIDTH
443 {
444 .procname = "sched_cfs_bandwidth_slice_us",
445 .data = &sysctl_sched_cfs_bandwidth_slice,
446 .maxlen = sizeof(unsigned int),
447 .mode = 0644,
448 .proc_handler = proc_dointvec_minmax,
449 .extra1 = &one,
450 },
451#endif
f20786ff
PZ		 452#ifdef CONFIG_PROVE_LOCKING
453 {
f20786ff
PZ		 454 .procname = "prove_locking",
455 .data = &prove_locking,
456 .maxlen = sizeof(int),
457 .mode = 0644,
6d456111 458 .proc_handler = proc_dointvec,
f20786ff
PZ		 459 },
460#endif
461#ifdef CONFIG_LOCK_STAT
462 {
f20786ff
PZ		 463 .procname = "lock_stat",
464 .data = &lock_stat,
465 .maxlen = sizeof(int),
466 .mode = 0644,
6d456111 467 .proc_handler = proc_dointvec,
f20786ff 468 },
77e54a1f 469#endif
1da177e4 470 {
1da177e4
LT		 471 .procname = "panic",
472 .data = &panic_timeout,
473 .maxlen = sizeof(int),
474 .mode = 0644,
6d456111 475 .proc_handler = proc_dointvec,
1da177e4 476 },
046d662f 477#ifdef CONFIG_COREDUMP
1da177e4 478 {
1da177e4
LT		 479 .procname = "core_uses_pid",
480 .data = &core_uses_pid,
481 .maxlen = sizeof(int),
482 .mode = 0644,
6d456111 483 .proc_handler = proc_dointvec,
1da177e4
LT		 484 },
485 {
1da177e4
LT		 486 .procname = "core_pattern",
487 .data = core_pattern,
71ce92f3 488 .maxlen = CORENAME_MAX_SIZE,
1da177e4 489 .mode = 0644,
54b50199 490 .proc_handler = proc_dostring_coredump,
1da177e4 491 },
a293980c 492 {
a293980c
NH		 493 .procname = "core_pipe_limit",
494 .data = &core_pipe_limit,
495 .maxlen = sizeof(unsigned int),
496 .mode = 0644,
6d456111 497 .proc_handler = proc_dointvec,
a293980c 498 },
046d662f 499#endif
34f5a398 500#ifdef CONFIG_PROC_SYSCTL
1da177e4 501 {
1da177e4 502 .procname = "tainted",
25ddbb18 503 .maxlen = sizeof(long),
34f5a398 504 .mode = 0644,
6d456111 505 .proc_handler = proc_taint,
1da177e4 506 },
f4aacea2
KC		 507 {
508 .procname = "sysctl_writes_strict",
509 .data = &sysctl_writes_strict,
510 .maxlen = sizeof(int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec_minmax,
513 .extra1 = &neg_one,
514 .extra2 = &one,
515 },
34f5a398 516#endif
9745512c
AV		 517#ifdef CONFIG_LATENCYTOP
518 {
519 .procname = "latencytop",
520 .data = &latencytop_enabled,
521 .maxlen = sizeof(int),
522 .mode = 0644,
cb251765 523 .proc_handler = sysctl_latencytop,
9745512c
AV		 524 },
525#endif
1da177e4
LT		 526#ifdef CONFIG_BLK_DEV_INITRD
527 {
1da177e4
LT		 528 .procname = "real-root-dev",
529 .data = &real_root_dev,
530 .maxlen = sizeof(int),
531 .mode = 0644,
6d456111 532 .proc_handler = proc_dointvec,
1da177e4
LT		 533 },
534#endif
45807a1d 535 {
45807a1d
IM		 536 .procname = "print-fatal-signals",
537 .data = &print_fatal_signals,
538 .maxlen = sizeof(int),
539 .mode = 0644,
6d456111 540 .proc_handler = proc_dointvec,
45807a1d 541 },
72c57ed5 542#ifdef CONFIG_SPARC
1da177e4 543 {
1da177e4
LT		 544 .procname = "reboot-cmd",
545 .data = reboot_command,
546 .maxlen = 256,
547 .mode = 0644,
6d456111 548 .proc_handler = proc_dostring,
1da177e4
LT		 549 },
550 {
1da177e4
LT		 551 .procname = "stop-a",
552 .data = &stop_a_enabled,
553 .maxlen = sizeof (int),
554 .mode = 0644,
6d456111 555 .proc_handler = proc_dointvec,
1da177e4
LT		 556 },
557 {
1da177e4
LT		 558 .procname = "scons-poweroff",
559 .data = &scons_pwroff,
560 .maxlen = sizeof (int),
561 .mode = 0644,
6d456111 562 .proc_handler = proc_dointvec,
1da177e4
LT		 563 },
564#endif
0871420f
DM		 565#ifdef CONFIG_SPARC64
566 {
0871420f
DM		 567 .procname = "tsb-ratio",
568 .data = &sysctl_tsb_ratio,
569 .maxlen = sizeof (int),
570 .mode = 0644,
6d456111 571 .proc_handler = proc_dointvec,
0871420f
DM		 572 },
573#endif
1da177e4
LT		 574#ifdef __hppa__
575 {
1da177e4
LT		 576 .procname = "soft-power",
577 .data = &pwrsw_enabled,
578 .maxlen = sizeof (int),
579 .mode = 0644,
6d456111 580 .proc_handler = proc_dointvec,
1da177e4 581 },
bf14e3b9
VG		 582#endif
583#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 584 {
1da177e4
LT		 585 .procname = "unaligned-trap",
586 .data = &unaligned_enabled,
587 .maxlen = sizeof (int),
588 .mode = 0644,
6d456111 589 .proc_handler = proc_dointvec,
1da177e4
LT		 590 },
591#endif
592 {
1da177e4
LT		 593 .procname = "ctrl-alt-del",
594 .data = &C_A_D,
595 .maxlen = sizeof(int),
596 .mode = 0644,
6d456111 597 .proc_handler = proc_dointvec,
1da177e4 598 },
606576ce 599#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 600 {
b0fc494f
SR		 601 .procname = "ftrace_enabled",
602 .data = &ftrace_enabled,
603 .maxlen = sizeof(int),
604 .mode = 0644,
6d456111 605 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 606 },
607#endif
f38f1d2a
SR		 608#ifdef CONFIG_STACK_TRACER
609 {
f38f1d2a
SR		 610 .procname = "stack_tracer_enabled",
611 .data = &stack_tracer_enabled,
612 .maxlen = sizeof(int),
613 .mode = 0644,
6d456111 614 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 615 },
616#endif
944ac425
SR		 617#ifdef CONFIG_TRACING
618 {
3299b4dd 619 .procname = "ftrace_dump_on_oops",
944ac425
SR		 620 .data = &ftrace_dump_on_oops,
621 .maxlen = sizeof(int),
622 .mode = 0644,
6d456111 623 .proc_handler = proc_dointvec,
944ac425 624 },
de7edd31
SRRH		 625 {
626 .procname = "traceoff_on_warning",
627 .data = &__disable_trace_on_warning,
628 .maxlen = sizeof(__disable_trace_on_warning),
629 .mode = 0644,
630 .proc_handler = proc_dointvec,
631 },
0daa2302
SRRH		 632 {
633 .procname = "tracepoint_printk",
634 .data = &tracepoint_printk,
635 .maxlen = sizeof(tracepoint_printk),
636 .mode = 0644,
637 .proc_handler = proc_dointvec,
638 },
944ac425 639#endif
2965faa5 640#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 641 {
642 .procname = "kexec_load_disabled",
643 .data = &kexec_load_disabled,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 /* only handle a transition from default "0" to "1" */
647 .proc_handler = proc_dointvec_minmax,
648 .extra1 = &one,
649 .extra2 = &one,
650 },
651#endif
a1ef5adb 652#ifdef CONFIG_MODULES
1da177e4 653 {
1da177e4
LT		 654 .procname = "modprobe",
655 .data = &modprobe_path,
656 .maxlen = KMOD_PATH_LEN,
657 .mode = 0644,
6d456111 658 .proc_handler = proc_dostring,
1da177e4 659 },
3d43321b 660 {
3d43321b
KC		 661 .procname = "modules_disabled",
662 .data = &modules_disabled,
663 .maxlen = sizeof(int),
664 .mode = 0644,
665 /* only handle a transition from default "0" to "1" */
6d456111 666 .proc_handler = proc_dointvec_minmax,
3d43321b
KC		 667 .extra1 = &one,
668 .extra2 = &one,
669 },
1da177e4 670#endif
86d56134 671#ifdef CONFIG_UEVENT_HELPER
1da177e4 672 {
1da177e4 673 .procname = "hotplug",
312c004d
KS		 674 .data = &uevent_helper,
675 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 676 .mode = 0644,
6d456111 677 .proc_handler = proc_dostring,
1da177e4 678 },
86d56134 679#endif
1da177e4
LT		 680#ifdef CONFIG_CHR_DEV_SG
681 {
1da177e4
LT		 682 .procname = "sg-big-buff",
683 .data = &sg_big_buff,
684 .maxlen = sizeof (int),
685 .mode = 0444,
6d456111 686 .proc_handler = proc_dointvec,
1da177e4
LT		 687 },
688#endif
689#ifdef CONFIG_BSD_PROCESS_ACCT
690 {
1da177e4
LT		 691 .procname = "acct",
692 .data = &acct_parm,
693 .maxlen = 3*sizeof(int),
694 .mode = 0644,
6d456111 695 .proc_handler = proc_dointvec,
1da177e4
LT		 696 },
697#endif
1da177e4
LT		 698#ifdef CONFIG_MAGIC_SYSRQ
699 {
1da177e4 700 .procname = "sysrq",
5d6f647f 701 .data = &__sysrq_enabled,
1da177e4
LT		 702 .maxlen = sizeof (int),
703 .mode = 0644,
97f5f0cd 704 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 705 },
706#endif
d6f8ff73 707#ifdef CONFIG_PROC_SYSCTL
1da177e4 708 {
1da177e4 709 .procname = "cad_pid",
9ec52099 710 .data = NULL,
1da177e4
LT		 711 .maxlen = sizeof (int),
712 .mode = 0600,
6d456111 713 .proc_handler = proc_do_cad_pid,
1da177e4 714 },
d6f8ff73 715#endif
1da177e4 716 {
1da177e4 717 .procname = "threads-max",
16db3d3f 718 .data = NULL,
1da177e4
LT		 719 .maxlen = sizeof(int),
720 .mode = 0644,
16db3d3f 721 .proc_handler = sysctl_max_threads,
1da177e4
LT		 722 },
723 {
1da177e4
LT		 724 .procname = "random",
725 .mode = 0555,
726 .child = random_table,
727 },
17f60a7d
EP		 728 {
729 .procname = "usermodehelper",
730 .mode = 0555,
731 .child = usermodehelper_table,
732 },
1da177e4 733 {
1da177e4
LT		 734 .procname = "overflowuid",
735 .data = &overflowuid,
736 .maxlen = sizeof(int),
737 .mode = 0644,
6d456111 738 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 739 .extra1 = &minolduid,
740 .extra2 = &maxolduid,
741 },
742 {
1da177e4
LT		 743 .procname = "overflowgid",
744 .data = &overflowgid,
745 .maxlen = sizeof(int),
746 .mode = 0644,
6d456111 747 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 748 .extra1 = &minolduid,
749 .extra2 = &maxolduid,
750 },
347a8dc3 751#ifdef CONFIG_S390
1da177e4
LT		 752#ifdef CONFIG_MATHEMU
753 {
1da177e4
LT		 754 .procname = "ieee_emulation_warnings",
755 .data = &sysctl_ieee_emulation_warnings,
756 .maxlen = sizeof(int),
757 .mode = 0644,
6d456111 758 .proc_handler = proc_dointvec,
1da177e4 759 },
1da177e4
LT		 760#endif
761 {
1da177e4 762 .procname = "userprocess_debug",
ab3c68ee 763 .data = &show_unhandled_signals,
1da177e4
LT		 764 .maxlen = sizeof(int),
765 .mode = 0644,
6d456111 766 .proc_handler = proc_dointvec,
1da177e4
LT		 767 },
768#endif
769 {
1da177e4
LT		 770 .procname = "pid_max",
771 .data = &pid_max,
772 .maxlen = sizeof (int),
773 .mode = 0644,
6d456111 774 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 775 .extra1 = &pid_max_min,
776 .extra2 = &pid_max_max,
777 },
778 {
1da177e4
LT		 779 .procname = "panic_on_oops",
780 .data = &panic_on_oops,
781 .maxlen = sizeof(int),
782 .mode = 0644,
6d456111 783 .proc_handler = proc_dointvec,
1da177e4 784 },
7ef3d2fd
JP		 785#if defined CONFIG_PRINTK
786 {
7ef3d2fd
JP		 787 .procname = "printk",
788 .data = &console_loglevel,
789 .maxlen = 4*sizeof(int),
790 .mode = 0644,
6d456111 791 .proc_handler = proc_dointvec,
7ef3d2fd 792 },
1da177e4 793 {
1da177e4 794 .procname = "printk_ratelimit",
717115e1 795 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 796 .maxlen = sizeof(int),
797 .mode = 0644,
6d456111 798 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 799 },
800 {
1da177e4 801 .procname = "printk_ratelimit_burst",
717115e1 802 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 803 .maxlen = sizeof(int),
804 .mode = 0644,
6d456111 805 .proc_handler = proc_dointvec,
1da177e4 806 },
af91322e 807 {
af91322e
DY		 808 .procname = "printk_delay",
809 .data = &printk_delay_msec,
810 .maxlen = sizeof(int),
811 .mode = 0644,
6d456111 812 .proc_handler = proc_dointvec_minmax,
af91322e
DY		 813 .extra1 = &zero,
814 .extra2 = &ten_thousand,
815 },
750afe7b
BP		 816 {
817 .procname = "printk_devkmsg",
818 .data = devkmsg_log_str,
819 .maxlen = DEVKMSG_STR_MAX_SIZE,
820 .mode = 0644,
821 .proc_handler = devkmsg_sysctl_set_loglvl,
822 },
eaf06b24
DR		 823 {
824 .procname = "dmesg_restrict",
825 .data = &dmesg_restrict,
826 .maxlen = sizeof(int),
827 .mode = 0644,
620f6e8e 828 .proc_handler = proc_dointvec_minmax_sysadmin,
eaf06b24
DR		 829 .extra1 = &zero,
830 .extra2 = &one,
831 },
455cd5ab
DR		 832 {
833 .procname = "kptr_restrict",
834 .data = &kptr_restrict,
835 .maxlen = sizeof(int),
836 .mode = 0644,
620f6e8e 837 .proc_handler = proc_dointvec_minmax_sysadmin,
455cd5ab
DR		 838 .extra1 = &zero,
839 .extra2 = &two,
840 },
df6e61d4 841#endif
1da177e4 842 {
1da177e4
LT		 843 .procname = "ngroups_max",
844 .data = &ngroups_max,
845 .maxlen = sizeof (int),
846 .mode = 0444,
6d456111 847 .proc_handler = proc_dointvec,
1da177e4 848 },
73efc039
DB		 849 {
850 .procname = "cap_last_cap",
851 .data = (void *)&cap_last_cap,
852 .maxlen = sizeof(int),
853 .mode = 0444,
854 .proc_handler = proc_dointvec,
855 },
58687acb 856#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 857 {
58687acb 858 .procname = "watchdog",
3c00ea82 859 .data = &watchdog_user_enabled,
504d7cf1
DZ		 860 .maxlen = sizeof (int),
861 .mode = 0644,
195daf66 862 .proc_handler = proc_watchdog,
586692a5
MSB		 863 .extra1 = &zero,
864 .extra2 = &one,
58687acb
DZ		 865 },
866 {
867 .procname = "watchdog_thresh",
586692a5 868 .data = &watchdog_thresh,
58687acb
DZ		 869 .maxlen = sizeof(int),
870 .mode = 0644,
195daf66 871 .proc_handler = proc_watchdog_thresh,
a6572f84 872 .extra1 = &zero,
58687acb 873 .extra2 = &sixty,
504d7cf1 874 },
195daf66
UO		 875 {
876 .procname = "nmi_watchdog",
877 .data = &nmi_watchdog_enabled,
878 .maxlen = sizeof (int),
879 .mode = 0644,
880 .proc_handler = proc_nmi_watchdog,
881 .extra1 = &zero,
882#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
883 .extra2 = &one,
884#else
885 .extra2 = &zero,
886#endif
887 },
888 {
889 .procname = "soft_watchdog",
890 .data = &soft_watchdog_enabled,
891 .maxlen = sizeof (int),
892 .mode = 0644,
893 .proc_handler = proc_soft_watchdog,
894 .extra1 = &zero,
895 .extra2 = &one,
896 },
fe4ba3c3
CM		 897 {
898 .procname = "watchdog_cpumask",
899 .data = &watchdog_cpumask_bits,
900 .maxlen = NR_CPUS,
901 .mode = 0644,
902 .proc_handler = proc_watchdog_cpumask,
903 },
2508ce18
DZ		 904 {
905 .procname = "softlockup_panic",
906 .data = &softlockup_panic,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec_minmax,
910 .extra1 = &zero,
911 .extra2 = &one,
912 },
ac1f5912
DZ		 913#ifdef CONFIG_HARDLOCKUP_DETECTOR
914 {
915 .procname = "hardlockup_panic",
916 .data = &hardlockup_panic,
917 .maxlen = sizeof(int),
918 .mode = 0644,
919 .proc_handler = proc_dointvec_minmax,
920 .extra1 = &zero,
921 .extra2 = &one,
922 },
923#endif
ed235875
AT		 924#ifdef CONFIG_SMP
925 {
926 .procname = "softlockup_all_cpu_backtrace",
927 .data = &sysctl_softlockup_all_cpu_backtrace,
928 .maxlen = sizeof(int),
929 .mode = 0644,
930 .proc_handler = proc_dointvec_minmax,
931 .extra1 = &zero,
932 .extra2 = &one,
933 },
55537871
JK		 934 {
935 .procname = "hardlockup_all_cpu_backtrace",
936 .data = &sysctl_hardlockup_all_cpu_backtrace,
937 .maxlen = sizeof(int),
938 .mode = 0644,
939 .proc_handler = proc_dointvec_minmax,
940 .extra1 = &zero,
941 .extra2 = &one,
942 },
ed235875 943#endif /* CONFIG_SMP */
5dc30558
DZ		 944#endif
945#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
946 {
947 .procname = "unknown_nmi_panic",
948 .data = &unknown_nmi_panic,
949 .maxlen = sizeof (int),
950 .mode = 0644,
951 .proc_handler = proc_dointvec,
952 },
504d7cf1 953#endif
1da177e4 954#if defined(CONFIG_X86)
8da5adda 955 {
8da5adda
DZ		 956 .procname = "panic_on_unrecovered_nmi",
957 .data = &panic_on_unrecovered_nmi,
958 .maxlen = sizeof(int),
959 .mode = 0644,
6d456111 960 .proc_handler = proc_dointvec,
8da5adda 961 },
5211a242 962 {
5211a242
KG		 963 .procname = "panic_on_io_nmi",
964 .data = &panic_on_io_nmi,
965 .maxlen = sizeof(int),
966 .mode = 0644,
6d456111 967 .proc_handler = proc_dointvec,
5211a242 968 },
55af7796
MH		 969#ifdef CONFIG_DEBUG_STACKOVERFLOW
970 {
971 .procname = "panic_on_stackoverflow",
972 .data = &sysctl_panic_on_stackoverflow,
973 .maxlen = sizeof(int),
974 .mode = 0644,
975 .proc_handler = proc_dointvec,
976 },
977#endif
1da177e4 978 {
1da177e4
LT		 979 .procname = "bootloader_type",
980 .data = &bootloader_type,
981 .maxlen = sizeof (int),
982 .mode = 0444,
6d456111 983 .proc_handler = proc_dointvec,
1da177e4 984 },
5031296c 985 {
5031296c
PA		 986 .procname = "bootloader_version",
987 .data = &bootloader_version,
988 .maxlen = sizeof (int),
989 .mode = 0444,
6d456111 990 .proc_handler = proc_dointvec,
5031296c 991 },
0741f4d2 992 {
0741f4d2
CE		 993 .procname = "kstack_depth_to_print",
994 .data = &kstack_depth_to_print,
995 .maxlen = sizeof(int),
996 .mode = 0644,
6d456111 997 .proc_handler = proc_dointvec,
0741f4d2 998 },
6e7c4025 999 {
6e7c4025
IM		 1000 .procname = "io_delay_type",
1001 .data = &io_delay_type,
1002 .maxlen = sizeof(int),
1003 .mode = 0644,
6d456111 1004 .proc_handler = proc_dointvec,
6e7c4025 1005 },
1da177e4 1006#endif
7a9166e3 1007#if defined(CONFIG_MMU)
1da177e4 1008 {
1da177e4
LT		 1009 .procname = "randomize_va_space",
1010 .data = &randomize_va_space,
1011 .maxlen = sizeof(int),
1012 .mode = 0644,
6d456111 1013 .proc_handler = proc_dointvec,
1da177e4 1014 },
7a9166e3 1015#endif
0152fb37 1016#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1017 {
951f22d5
MS		 1018 .procname = "spin_retry",
1019 .data = &spin_retry,
1020 .maxlen = sizeof (int),
1021 .mode = 0644,
6d456111 1022 .proc_handler = proc_dointvec,
951f22d5 1023 },
c255d844 1024#endif
673d5b43 1025#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1026 {
c255d844 1027 .procname = "acpi_video_flags",
77afcf78 1028 .data = &acpi_realmode_flags,
c255d844
PM		 1029 .maxlen = sizeof (unsigned long),
1030 .mode = 0644,
6d456111 1031 .proc_handler = proc_doulongvec_minmax,
c255d844 1032 },
d2b176ed 1033#endif
b6fca725 1034#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1035 {
d2b176ed
JS		 1036 .procname = "ignore-unaligned-usertrap",
1037 .data = &no_unaligned_warning,
1038 .maxlen = sizeof (int),
1039 .mode = 0644,
6d456111 1040 .proc_handler = proc_dointvec,
d2b176ed 1041 },
b6fca725
VG		 1042#endif
1043#ifdef CONFIG_IA64
88fc241f 1044 {
88fc241f
DC		 1045 .procname = "unaligned-dump-stack",
1046 .data = &unaligned_dump_stack,
1047 .maxlen = sizeof (int),
1048 .mode = 0644,
6d456111 1049 .proc_handler = proc_dointvec,
88fc241f 1050 },
bebfa101 1051#endif
e162b39a
MSB		 1052#ifdef CONFIG_DETECT_HUNG_TASK
1053 {
e162b39a
MSB		 1054 .procname = "hung_task_panic",
1055 .data = &sysctl_hung_task_panic,
1056 .maxlen = sizeof(int),
1057 .mode = 0644,
6d456111 1058 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 1059 .extra1 = &zero,
1060 .extra2 = &one,
1061 },
82a1fcb9 1062 {
82a1fcb9
IM		 1063 .procname = "hung_task_check_count",
1064 .data = &sysctl_hung_task_check_count,
cd64647f 1065 .maxlen = sizeof(int),
82a1fcb9 1066 .mode = 0644,
cd64647f
LZ		 1067 .proc_handler = proc_dointvec_minmax,
1068 .extra1 = &zero,
82a1fcb9
IM		 1069 },
1070 {
82a1fcb9
IM		 1071 .procname = "hung_task_timeout_secs",
1072 .data = &sysctl_hung_task_timeout_secs,
90739081 1073 .maxlen = sizeof(unsigned long),
82a1fcb9 1074 .mode = 0644,
6d456111 1075 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1076 .extra2 = &hung_task_timeout_max,
82a1fcb9
IM		 1077 },
1078 {
82a1fcb9
IM		 1079 .procname = "hung_task_warnings",
1080 .data = &sysctl_hung_task_warnings,
270750db 1081 .maxlen = sizeof(int),
82a1fcb9 1082 .mode = 0644,
270750db
AT		 1083 .proc_handler = proc_dointvec_minmax,
1084 .extra1 = &neg_one,
82a1fcb9 1085 },
c4f3b63f 1086#endif
bebfa101
AK		 1087#ifdef CONFIG_COMPAT
1088 {
bebfa101
AK		 1089 .procname = "compat-log",
1090 .data = &compat_log,
1091 .maxlen = sizeof (int),
1092 .mode = 0644,
6d456111 1093 .proc_handler = proc_dointvec,
bebfa101 1094 },
951f22d5 1095#endif
23f78d4a
IM		 1096#ifdef CONFIG_RT_MUTEXES
1097 {
23f78d4a
IM		 1098 .procname = "max_lock_depth",
1099 .data = &max_lock_depth,
1100 .maxlen = sizeof(int),
1101 .mode = 0644,
6d456111 1102 .proc_handler = proc_dointvec,
23f78d4a 1103 },
5096add8 1104#endif
10a0a8d4 1105 {
10a0a8d4
JF		 1106 .procname = "poweroff_cmd",
1107 .data = &poweroff_cmd,
1108 .maxlen = POWEROFF_CMD_PATH_LEN,
1109 .mode = 0644,
6d456111 1110 .proc_handler = proc_dostring,
10a0a8d4 1111 },
0b77f5bf
DH		 1112#ifdef CONFIG_KEYS
1113 {
0b77f5bf
DH		 1114 .procname = "keys",
1115 .mode = 0555,
1116 .child = key_sysctls,
1117 },
1118#endif
cdd6c482 1119#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1120 /*
1121 * User-space scripts rely on the existence of this file
1122 * as a feature check for perf_events being enabled.
1123 *
1124 * So it's an ABI, do not remove!
1125 */
1ccd1549 1126 {
cdd6c482
IM		 1127 .procname = "perf_event_paranoid",
1128 .data = &sysctl_perf_event_paranoid,
1129 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1130 .mode = 0644,
6d456111 1131 .proc_handler = proc_dointvec,
1ccd1549 1132 },
c5078f78 1133 {
cdd6c482
IM		 1134 .procname = "perf_event_mlock_kb",
1135 .data = &sysctl_perf_event_mlock,
1136 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1137 .mode = 0644,
6d456111 1138 .proc_handler = proc_dointvec,
c5078f78 1139 },
a78ac325 1140 {
cdd6c482
IM		 1141 .procname = "perf_event_max_sample_rate",
1142 .data = &sysctl_perf_event_sample_rate,
1143 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1144 .mode = 0644,
163ec435 1145 .proc_handler = perf_proc_update_handler,
723478c8 1146 .extra1 = &one,
a78ac325 1147 },
14c63f17
DH		 1148 {
1149 .procname = "perf_cpu_time_max_percent",
1150 .data = &sysctl_perf_cpu_time_max_percent,
1151 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1152 .mode = 0644,
1153 .proc_handler = perf_cpu_time_max_percent_handler,
1154 .extra1 = &zero,
1155 .extra2 = &one_hundred,
1156 },
c5dfd78e
ACM		 1157 {
1158 .procname = "perf_event_max_stack",
a831100a 1159 .data = &sysctl_perf_event_max_stack,
c5dfd78e
ACM		 1160 .maxlen = sizeof(sysctl_perf_event_max_stack),
1161 .mode = 0644,
1162 .proc_handler = perf_event_max_stack_handler,
1163 .extra1 = &zero,
1164 .extra2 = &six_hundred_forty_kb,
1165 },
c85b0334
ACM		 1166 {
1167 .procname = "perf_event_max_contexts_per_stack",
1168 .data = &sysctl_perf_event_max_contexts_per_stack,
1169 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1170 .mode = 0644,
1171 .proc_handler = perf_event_max_stack_handler,
1172 .extra1 = &zero,
1173 .extra2 = &one_thousand,
1174 },
1ccd1549 1175#endif
dfec072e
VN		 1176#ifdef CONFIG_KMEMCHECK
1177 {
dfec072e
VN		 1178 .procname = "kmemcheck",
1179 .data = &kmemcheck_enabled,
1180 .maxlen = sizeof(int),
1181 .mode = 0644,
6d456111 1182 .proc_handler = proc_dointvec,
dfec072e 1183 },
cb684b5b 1184#endif
9e3961a0
PB		 1185 {
1186 .procname = "panic_on_warn",
1187 .data = &panic_on_warn,
1188 .maxlen = sizeof(int),
1189 .mode = 0644,
1190 .proc_handler = proc_dointvec_minmax,
1191 .extra1 = &zero,
1192 .extra2 = &one,
1193 },
bc7a34b8
TG		 1194#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1195 {
1196 .procname = "timer_migration",
1197 .data = &sysctl_timer_migration,
1198 .maxlen = sizeof(unsigned int),
1199 .mode = 0644,
1200 .proc_handler = timer_migration_handler,
1201 },
1be7f75d
AS		 1202#endif
1203#ifdef CONFIG_BPF_SYSCALL
1204 {
1205 .procname = "unprivileged_bpf_disabled",
1206 .data = &sysctl_unprivileged_bpf_disabled,
1207 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1208 .mode = 0644,
1209 /* only handle a transition from default "0" to "1" */
1210 .proc_handler = proc_dointvec_minmax,
1211 .extra1 = &one,
1212 .extra2 = &one,
1213 },
088e9d25
DBO		 1214#endif
1215#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1216 {
1217 .procname = "panic_on_rcu_stall",
1218 .data = &sysctl_panic_on_rcu_stall,
1219 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1220 .mode = 0644,
1221 .proc_handler = proc_dointvec_minmax,
1222 .extra1 = &zero,
1223 .extra2 = &one,
1224 },
bc7a34b8 1225#endif
6fce56ec 1226 { }
1da177e4
LT		 1227};
1228
d8217f07 1229static struct ctl_table vm_table[] = {
1da177e4 1230 {
1da177e4
LT		 1231 .procname = "overcommit_memory",
1232 .data = &sysctl_overcommit_memory,
1233 .maxlen = sizeof(sysctl_overcommit_memory),
1234 .mode = 0644,
cb16e95f
PH		 1235 .proc_handler = proc_dointvec_minmax,
1236 .extra1 = &zero,
1237 .extra2 = &two,
1da177e4 1238 },
fadd8fbd 1239 {
fadd8fbd
KH		 1240 .procname = "panic_on_oom",
1241 .data = &sysctl_panic_on_oom,
1242 .maxlen = sizeof(sysctl_panic_on_oom),
1243 .mode = 0644,
cb16e95f
PH		 1244 .proc_handler = proc_dointvec_minmax,
1245 .extra1 = &zero,
1246 .extra2 = &two,
fadd8fbd 1247 },
fe071d7e 1248 {
fe071d7e
DR		 1249 .procname = "oom_kill_allocating_task",
1250 .data = &sysctl_oom_kill_allocating_task,
1251 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1252 .mode = 0644,
6d456111 1253 .proc_handler = proc_dointvec,
fe071d7e 1254 },
fef1bdd6 1255 {
fef1bdd6
DR		 1256 .procname = "oom_dump_tasks",
1257 .data = &sysctl_oom_dump_tasks,
1258 .maxlen = sizeof(sysctl_oom_dump_tasks),
1259 .mode = 0644,
6d456111 1260 .proc_handler = proc_dointvec,
fef1bdd6 1261 },
1da177e4 1262 {
1da177e4
LT		 1263 .procname = "overcommit_ratio",
1264 .data = &sysctl_overcommit_ratio,
1265 .maxlen = sizeof(sysctl_overcommit_ratio),
1266 .mode = 0644,
49f0ce5f
JM		 1267 .proc_handler = overcommit_ratio_handler,
1268 },
1269 {
1270 .procname = "overcommit_kbytes",
1271 .data = &sysctl_overcommit_kbytes,
1272 .maxlen = sizeof(sysctl_overcommit_kbytes),
1273 .mode = 0644,
1274 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1275 },
1276 {
1da177e4
LT		 1277 .procname = "page-cluster",
1278 .data = &page_cluster,
1279 .maxlen = sizeof(int),
1280 .mode = 0644,
cb16e95f
PH		 1281 .proc_handler = proc_dointvec_minmax,
1282 .extra1 = &zero,
1da177e4
LT		 1283 },
1284 {
1da177e4
LT		 1285 .procname = "dirty_background_ratio",
1286 .data = &dirty_background_ratio,
1287 .maxlen = sizeof(dirty_background_ratio),
1288 .mode = 0644,
6d456111 1289 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1290 .extra1 = &zero,
1291 .extra2 = &one_hundred,
1292 },
2da02997 1293 {
2da02997
DR		 1294 .procname = "dirty_background_bytes",
1295 .data = &dirty_background_bytes,
1296 .maxlen = sizeof(dirty_background_bytes),
1297 .mode = 0644,
6d456111 1298 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1299 .extra1 = &one_ul,
2da02997 1300 },
1da177e4 1301 {
1da177e4
LT		 1302 .procname = "dirty_ratio",
1303 .data = &vm_dirty_ratio,
1304 .maxlen = sizeof(vm_dirty_ratio),
1305 .mode = 0644,
6d456111 1306 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1307 .extra1 = &zero,
1308 .extra2 = &one_hundred,
1309 },
2da02997 1310 {
2da02997
DR		 1311 .procname = "dirty_bytes",
1312 .data = &vm_dirty_bytes,
1313 .maxlen = sizeof(vm_dirty_bytes),
1314 .mode = 0644,
6d456111 1315 .proc_handler = dirty_bytes_handler,
9e4a5bda 1316 .extra1 = &dirty_bytes_min,
2da02997 1317 },
1da177e4 1318 {
1da177e4 1319 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1320 .data = &dirty_writeback_interval,
1321 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1322 .mode = 0644,
6d456111 1323 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1324 },
1325 {
1da177e4 1326 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1327 .data = &dirty_expire_interval,
1328 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1329 .mode = 0644,
cb16e95f
PH		 1330 .proc_handler = proc_dointvec_minmax,
1331 .extra1 = &zero,
1da177e4 1332 },
1efff914
TT		 1333 {
1334 .procname = "dirtytime_expire_seconds",
1335 .data = &dirtytime_expire_interval,
1336 .maxlen = sizeof(dirty_expire_interval),
1337 .mode = 0644,
1338 .proc_handler = dirtytime_interval_handler,
1339 .extra1 = &zero,
1340 },
1da177e4 1341 {
3965c9ae
WL		 1342 .procname = "nr_pdflush_threads",
1343 .mode = 0444 /* read-only */,
1344 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1345 },
1346 {
1da177e4
LT		 1347 .procname = "swappiness",
1348 .data = &vm_swappiness,
1349 .maxlen = sizeof(vm_swappiness),
1350 .mode = 0644,
6d456111 1351 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1352 .extra1 = &zero,
1353 .extra2 = &one_hundred,
1354 },
1355#ifdef CONFIG_HUGETLB_PAGE
06808b08 1356 {
1da177e4 1357 .procname = "nr_hugepages",
e5ff2159 1358 .data = NULL,
1da177e4
LT		 1359 .maxlen = sizeof(unsigned long),
1360 .mode = 0644,
6d456111 1361 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1362 },
1363#ifdef CONFIG_NUMA
1364 {
1365 .procname = "nr_hugepages_mempolicy",
1366 .data = NULL,
1367 .maxlen = sizeof(unsigned long),
1368 .mode = 0644,
1369 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1370 },
1371#endif
1da177e4 1372 {
1da177e4
LT		 1373 .procname = "hugetlb_shm_group",
1374 .data = &sysctl_hugetlb_shm_group,
1375 .maxlen = sizeof(gid_t),
1376 .mode = 0644,
6d456111 1377 .proc_handler = proc_dointvec,
1da177e4 1378 },
396faf03 1379 {
396faf03
MG		 1380 .procname = "hugepages_treat_as_movable",
1381 .data = &hugepages_treat_as_movable,
1382 .maxlen = sizeof(int),
1383 .mode = 0644,
86cdb465 1384 .proc_handler = proc_dointvec,
396faf03 1385 },
d1c3fb1f 1386 {
d1c3fb1f 1387 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1388 .data = NULL,
1389 .maxlen = sizeof(unsigned long),
d1c3fb1f 1390 .mode = 0644,
6d456111 1391 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1392 },
1da177e4
LT		 1393#endif
1394 {
1da177e4
LT		 1395 .procname = "lowmem_reserve_ratio",
1396 .data = &sysctl_lowmem_reserve_ratio,
1397 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1398 .mode = 0644,
6d456111 1399 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1400 },
9d0243bc 1401 {
9d0243bc
AM		 1402 .procname = "drop_caches",
1403 .data = &sysctl_drop_caches,
1404 .maxlen = sizeof(int),
1405 .mode = 0644,
1406 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1407 .extra1 = &one,
5509a5d2 1408 .extra2 = &four,
9d0243bc 1409 },
76ab0f53
MG		 1410#ifdef CONFIG_COMPACTION
1411 {
1412 .procname = "compact_memory",
1413 .data = &sysctl_compact_memory,
1414 .maxlen = sizeof(int),
1415 .mode = 0200,
1416 .proc_handler = sysctl_compaction_handler,
1417 },
5e771905
MG		 1418 {
1419 .procname = "extfrag_threshold",
1420 .data = &sysctl_extfrag_threshold,
1421 .maxlen = sizeof(int),
1422 .mode = 0644,
1423 .proc_handler = sysctl_extfrag_handler,
1424 .extra1 = &min_extfrag_threshold,
1425 .extra2 = &max_extfrag_threshold,
1426 },
5bbe3547
EM		 1427 {
1428 .procname = "compact_unevictable_allowed",
1429 .data = &sysctl_compact_unevictable_allowed,
1430 .maxlen = sizeof(int),
1431 .mode = 0644,
1432 .proc_handler = proc_dointvec,
1433 .extra1 = &zero,
1434 .extra2 = &one,
1435 },
5e771905 1436
76ab0f53 1437#endif /* CONFIG_COMPACTION */
1da177e4 1438 {
1da177e4
LT		 1439 .procname = "min_free_kbytes",
1440 .data = &min_free_kbytes,
1441 .maxlen = sizeof(min_free_kbytes),
1442 .mode = 0644,
6d456111 1443 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1444 .extra1 = &zero,
1445 },
795ae7a0
JW		 1446 {
1447 .procname = "watermark_scale_factor",
1448 .data = &watermark_scale_factor,
1449 .maxlen = sizeof(watermark_scale_factor),
1450 .mode = 0644,
1451 .proc_handler = watermark_scale_factor_sysctl_handler,
1452 .extra1 = &one,
1453 .extra2 = &one_thousand,
1454 },
8ad4b1fb 1455 {
8ad4b1fb
RS		 1456 .procname = "percpu_pagelist_fraction",
1457 .data = &percpu_pagelist_fraction,
1458 .maxlen = sizeof(percpu_pagelist_fraction),
1459 .mode = 0644,
6d456111 1460 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1461 .extra1 = &zero,
8ad4b1fb 1462 },
1da177e4
LT		 1463#ifdef CONFIG_MMU
1464 {
1da177e4
LT		 1465 .procname = "max_map_count",
1466 .data = &sysctl_max_map_count,
1467 .maxlen = sizeof(sysctl_max_map_count),
1468 .mode = 0644,
3e26120c 1469 .proc_handler = proc_dointvec_minmax,
70da2340 1470 .extra1 = &zero,
1da177e4 1471 },
dd8632a1
PM		 1472#else
1473 {
dd8632a1
PM		 1474 .procname = "nr_trim_pages",
1475 .data = &sysctl_nr_trim_pages,
1476 .maxlen = sizeof(sysctl_nr_trim_pages),
1477 .mode = 0644,
6d456111 1478 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1479 .extra1 = &zero,
1480 },
1da177e4
LT		 1481#endif
1482 {
1da177e4
LT		 1483 .procname = "laptop_mode",
1484 .data = &laptop_mode,
1485 .maxlen = sizeof(laptop_mode),
1486 .mode = 0644,
6d456111 1487 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1488 },
1489 {
1da177e4
LT		 1490 .procname = "block_dump",
1491 .data = &block_dump,
1492 .maxlen = sizeof(block_dump),
1493 .mode = 0644,
6d456111 1494 .proc_handler = proc_dointvec,
1da177e4
LT		 1495 .extra1 = &zero,
1496 },
1497 {
1da177e4
LT		 1498 .procname = "vfs_cache_pressure",
1499 .data = &sysctl_vfs_cache_pressure,
1500 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1501 .mode = 0644,
6d456111 1502 .proc_handler = proc_dointvec,
1da177e4
LT		 1503 .extra1 = &zero,
1504 },
1505#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1506 {
1da177e4
LT		 1507 .procname = "legacy_va_layout",
1508 .data = &sysctl_legacy_va_layout,
1509 .maxlen = sizeof(sysctl_legacy_va_layout),
1510 .mode = 0644,
6d456111 1511 .proc_handler = proc_dointvec,
1da177e4
LT		 1512 .extra1 = &zero,
1513 },
1514#endif
1743660b
CL		 1515#ifdef CONFIG_NUMA
1516 {
1743660b 1517 .procname = "zone_reclaim_mode",
a5f5f91d
MG		 1518 .data = &node_reclaim_mode,
1519 .maxlen = sizeof(node_reclaim_mode),
1743660b 1520 .mode = 0644,
6d456111 1521 .proc_handler = proc_dointvec,
c84db23c 1522 .extra1 = &zero,
1743660b 1523 },
9614634f 1524 {
9614634f
CL		 1525 .procname = "min_unmapped_ratio",
1526 .data = &sysctl_min_unmapped_ratio,
1527 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1528 .mode = 0644,
6d456111 1529 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1530 .extra1 = &zero,
1531 .extra2 = &one_hundred,
1532 },
0ff38490 1533 {
0ff38490
CL		 1534 .procname = "min_slab_ratio",
1535 .data = &sysctl_min_slab_ratio,
1536 .maxlen = sizeof(sysctl_min_slab_ratio),
1537 .mode = 0644,
6d456111 1538 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1539 .extra1 = &zero,
1540 .extra2 = &one_hundred,
1541 },
e6e5494c 1542#endif
77461ab3
CL		 1543#ifdef CONFIG_SMP
1544 {
77461ab3
CL		 1545 .procname = "stat_interval",
1546 .data = &sysctl_stat_interval,
1547 .maxlen = sizeof(sysctl_stat_interval),
1548 .mode = 0644,
6d456111 1549 .proc_handler = proc_dointvec_jiffies,
77461ab3 1550 },
52b6f46b
HD		 1551 {
1552 .procname = "stat_refresh",
1553 .data = NULL,
1554 .maxlen = 0,
1555 .mode = 0600,
1556 .proc_handler = vmstat_refresh,
1557 },
77461ab3 1558#endif
6e141546 1559#ifdef CONFIG_MMU
ed032189 1560 {
ed032189 1561 .procname = "mmap_min_addr",
788084ab
EP		 1562 .data = &dac_mmap_min_addr,
1563 .maxlen = sizeof(unsigned long),
ed032189 1564 .mode = 0644,
6d456111 1565 .proc_handler = mmap_min_addr_handler,
ed032189 1566 },
6e141546 1567#endif
f0c0b2b8
KH		 1568#ifdef CONFIG_NUMA
1569 {
f0c0b2b8
KH		 1570 .procname = "numa_zonelist_order",
1571 .data = &numa_zonelist_order,
1572 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1573 .mode = 0644,
6d456111 1574 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1575 },
1576#endif
2b8232ce 1577#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1578 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1579 {
e6e5494c 1580 .procname = "vdso_enabled",
3d7ee969
AL		 1581#ifdef CONFIG_X86_32
1582 .data = &vdso32_enabled,
1583 .maxlen = sizeof(vdso32_enabled),
1584#else
e6e5494c
IM		 1585 .data = &vdso_enabled,
1586 .maxlen = sizeof(vdso_enabled),
3d7ee969 1587#endif
e6e5494c 1588 .mode = 0644,
6d456111 1589 .proc_handler = proc_dointvec,
e6e5494c
IM		 1590 .extra1 = &zero,
1591 },
1da177e4 1592#endif
195cf453
BG		 1593#ifdef CONFIG_HIGHMEM
1594 {
195cf453
BG		 1595 .procname = "highmem_is_dirtyable",
1596 .data = &vm_highmem_is_dirtyable,
1597 .maxlen = sizeof(vm_highmem_is_dirtyable),
1598 .mode = 0644,
6d456111 1599 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1600 .extra1 = &zero,
1601 .extra2 = &one,
1602 },
1603#endif
6a46079c
AK		 1604#ifdef CONFIG_MEMORY_FAILURE
1605 {
6a46079c
AK		 1606 .procname = "memory_failure_early_kill",
1607 .data = &sysctl_memory_failure_early_kill,
1608 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1609 .mode = 0644,
6d456111 1610 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1611 .extra1 = &zero,
1612 .extra2 = &one,
1613 },
1614 {
6a46079c
AK		 1615 .procname = "memory_failure_recovery",
1616 .data = &sysctl_memory_failure_recovery,
1617 .maxlen = sizeof(sysctl_memory_failure_recovery),
1618 .mode = 0644,
6d456111 1619 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1620 .extra1 = &zero,
1621 .extra2 = &one,
1622 },
1623#endif
c9b1d098
AS		 1624 {
1625 .procname = "user_reserve_kbytes",
1626 .data = &sysctl_user_reserve_kbytes,
1627 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1628 .mode = 0644,
1629 .proc_handler = proc_doulongvec_minmax,
1630 },
4eeab4f5
AS		 1631 {
1632 .procname = "admin_reserve_kbytes",
1633 .data = &sysctl_admin_reserve_kbytes,
1634 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1635 .mode = 0644,
1636 .proc_handler = proc_doulongvec_minmax,
1637 },
d07e2259
DC		 1638#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1639 {
1640 .procname = "mmap_rnd_bits",
1641 .data = &mmap_rnd_bits,
1642 .maxlen = sizeof(mmap_rnd_bits),
1643 .mode = 0600,
1644 .proc_handler = proc_dointvec_minmax,
1645 .extra1 = (void *)&mmap_rnd_bits_min,
1646 .extra2 = (void *)&mmap_rnd_bits_max,
1647 },
1648#endif
1649#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1650 {
1651 .procname = "mmap_rnd_compat_bits",
1652 .data = &mmap_rnd_compat_bits,
1653 .maxlen = sizeof(mmap_rnd_compat_bits),
1654 .mode = 0600,
1655 .proc_handler = proc_dointvec_minmax,
1656 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1657 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1658 },
1659#endif
6fce56ec 1660 { }
1da177e4
LT		 1661};
1662
d8217f07 1663static struct ctl_table fs_table[] = {
1da177e4 1664 {
1da177e4
LT		 1665 .procname = "inode-nr",
1666 .data = &inodes_stat,
3942c07c 1667 .maxlen = 2*sizeof(long),
1da177e4 1668 .mode = 0444,
cffbc8aa 1669 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1670 },
1671 {
1da177e4
LT		 1672 .procname = "inode-state",
1673 .data = &inodes_stat,
3942c07c 1674 .maxlen = 7*sizeof(long),
1da177e4 1675 .mode = 0444,
cffbc8aa 1676 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1677 },
1678 {
1da177e4
LT		 1679 .procname = "file-nr",
1680 .data = &files_stat,
518de9b3 1681 .maxlen = sizeof(files_stat),
1da177e4 1682 .mode = 0444,
6d456111 1683 .proc_handler = proc_nr_files,
1da177e4
LT		 1684 },
1685 {
1da177e4
LT		 1686 .procname = "file-max",
1687 .data = &files_stat.max_files,
518de9b3 1688 .maxlen = sizeof(files_stat.max_files),
1da177e4 1689 .mode = 0644,
518de9b3 1690 .proc_handler = proc_doulongvec_minmax,
1da177e4 1691 },
9cfe015a 1692 {
9cfe015a
ED		 1693 .procname = "nr_open",
1694 .data = &sysctl_nr_open,
1695 .maxlen = sizeof(int),
1696 .mode = 0644,
6d456111 1697 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1698 .extra1 = &sysctl_nr_open_min,
1699 .extra2 = &sysctl_nr_open_max,
9cfe015a 1700 },
1da177e4 1701 {
1da177e4
LT		 1702 .procname = "dentry-state",
1703 .data = &dentry_stat,
3942c07c 1704 .maxlen = 6*sizeof(long),
1da177e4 1705 .mode = 0444,
312d3ca8 1706 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1707 },
1708 {
1da177e4
LT		 1709 .procname = "overflowuid",
1710 .data = &fs_overflowuid,
1711 .maxlen = sizeof(int),
1712 .mode = 0644,
6d456111 1713 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1714 .extra1 = &minolduid,
1715 .extra2 = &maxolduid,
1716 },
1717 {
1da177e4
LT		 1718 .procname = "overflowgid",
1719 .data = &fs_overflowgid,
1720 .maxlen = sizeof(int),
1721 .mode = 0644,
6d456111 1722 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1723 .extra1 = &minolduid,
1724 .extra2 = &maxolduid,
1725 },
bfcd17a6 1726#ifdef CONFIG_FILE_LOCKING
1da177e4 1727 {
1da177e4
LT		 1728 .procname = "leases-enable",
1729 .data = &leases_enable,
1730 .maxlen = sizeof(int),
1731 .mode = 0644,
6d456111 1732 .proc_handler = proc_dointvec,
1da177e4 1733 },
bfcd17a6 1734#endif
1da177e4
LT		 1735#ifdef CONFIG_DNOTIFY
1736 {
1da177e4
LT		 1737 .procname = "dir-notify-enable",
1738 .data = &dir_notify_enable,
1739 .maxlen = sizeof(int),
1740 .mode = 0644,
6d456111 1741 .proc_handler = proc_dointvec,
1da177e4
LT		 1742 },
1743#endif
1744#ifdef CONFIG_MMU
bfcd17a6 1745#ifdef CONFIG_FILE_LOCKING
1da177e4 1746 {
1da177e4
LT		 1747 .procname = "lease-break-time",
1748 .data = &lease_break_time,
1749 .maxlen = sizeof(int),
1750 .mode = 0644,
6d456111 1751 .proc_handler = proc_dointvec,
1da177e4 1752 },
bfcd17a6 1753#endif
ebf3f09c 1754#ifdef CONFIG_AIO
1da177e4 1755 {
1da177e4
LT		 1756 .procname = "aio-nr",
1757 .data = &aio_nr,
1758 .maxlen = sizeof(aio_nr),
1759 .mode = 0444,
6d456111 1760 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1761 },
1762 {
1da177e4
LT		 1763 .procname = "aio-max-nr",
1764 .data = &aio_max_nr,
1765 .maxlen = sizeof(aio_max_nr),
1766 .mode = 0644,
6d456111 1767 .proc_handler = proc_doulongvec_minmax,
1da177e4 1768 },
ebf3f09c 1769#endif /* CONFIG_AIO */
2d9048e2 1770#ifdef CONFIG_INOTIFY_USER
0399cb08 1771 {
0399cb08
RL		 1772 .procname = "inotify",
1773 .mode = 0555,
1774 .child = inotify_table,
1775 },
1776#endif
7ef9964e
DL		 1777#ifdef CONFIG_EPOLL
1778 {
1779 .procname = "epoll",
1780 .mode = 0555,
1781 .child = epoll_table,
1782 },
1783#endif
1da177e4 1784#endif
800179c9
KC		 1785 {
1786 .procname = "protected_symlinks",
1787 .data = &sysctl_protected_symlinks,
1788 .maxlen = sizeof(int),
1789 .mode = 0600,
1790 .proc_handler = proc_dointvec_minmax,
1791 .extra1 = &zero,
1792 .extra2 = &one,
1793 },
1794 {
1795 .procname = "protected_hardlinks",
1796 .data = &sysctl_protected_hardlinks,
1797 .maxlen = sizeof(int),
1798 .mode = 0600,
1799 .proc_handler = proc_dointvec_minmax,
1800 .extra1 = &zero,
1801 .extra2 = &one,
1802 },
d6e71144 1803 {
d6e71144
AC		 1804 .procname = "suid_dumpable",
1805 .data = &suid_dumpable,
1806 .maxlen = sizeof(int),
1807 .mode = 0644,
54b50199 1808 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1809 .extra1 = &zero,
1810 .extra2 = &two,
d6e71144 1811 },
2abc26fc
EB		 1812#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1813 {
2abc26fc
EB		 1814 .procname = "binfmt_misc",
1815 .mode = 0555,
f9bd6733 1816 .child = sysctl_mount_point,
2abc26fc
EB		 1817 },
1818#endif
b492e95b 1819 {
ff9da691
JA		 1820 .procname = "pipe-max-size",
1821 .data = &pipe_max_size,
b492e95b
JA		 1822 .maxlen = sizeof(int),
1823 .mode = 0644,
ff9da691
JA		 1824 .proc_handler = &pipe_proc_fn,
1825 .extra1 = &pipe_min_size,
b492e95b 1826 },
759c0114
WT		 1827 {
1828 .procname = "pipe-user-pages-hard",
1829 .data = &pipe_user_pages_hard,
1830 .maxlen = sizeof(pipe_user_pages_hard),
1831 .mode = 0644,
1832 .proc_handler = proc_doulongvec_minmax,
1833 },
1834 {
1835 .procname = "pipe-user-pages-soft",
1836 .data = &pipe_user_pages_soft,
1837 .maxlen = sizeof(pipe_user_pages_soft),
1838 .mode = 0644,
1839 .proc_handler = proc_doulongvec_minmax,
1840 },
6fce56ec 1841 { }
1da177e4
LT		 1842};
1843
d8217f07 1844static struct ctl_table debug_table[] = {
7ac57a89 1845#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1846 {
abd4f750
MAS		 1847 .procname = "exception-trace",
1848 .data = &show_unhandled_signals,
1849 .maxlen = sizeof(int),
1850 .mode = 0644,
1851 .proc_handler = proc_dointvec
1852 },
b2be84df
MH		 1853#endif
1854#if defined(CONFIG_OPTPROBES)
1855 {
1856 .procname = "kprobes-optimization",
1857 .data = &sysctl_kprobes_optimization,
1858 .maxlen = sizeof(int),
1859 .mode = 0644,
1860 .proc_handler = proc_kprobes_optimization_handler,
1861 .extra1 = &zero,
1862 .extra2 = &one,
1863 },
abd4f750 1864#endif
6fce56ec 1865 { }
1da177e4
LT		 1866};
1867
d8217f07 1868static struct ctl_table dev_table[] = {
6fce56ec 1869 { }
0eeca283 1870};
1da177e4 1871
de4e83bd 1872int __init sysctl_init(void)
d912b0cc 1873{
fd4b616b
SR		 1874 struct ctl_table_header *hdr;
1875
1876 hdr = register_sysctl_table(sysctl_base_table);
1877 kmemleak_not_leak(hdr);
d912b0cc
EB		 1878 return 0;
1879}
1880
b89a8171
EB		 1881#endif /* CONFIG_SYSCTL */
1882
1da177e4
LT		 1883/*
1884 * /proc/sys support
1885 */
1886
b89a8171 1887#ifdef CONFIG_PROC_SYSCTL
1da177e4 1888
f8808300
KC		 1889static int _proc_do_string(char *data, int maxlen, int write,
1890 char __user *buffer,
b1ba4ddd 1891 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1892{
1893 size_t len;
1894 char __user *p;
1895 char c;
8d060877
ON		 1896
1897 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1898 *lenp = 0;
1899 return 0;
1900 }
8d060877 1901
1da177e4 1902 if (write) {
f4aacea2
KC		 1903 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1904 /* Only continue writes not past the end of buffer. */
1905 len = strlen(data);
1906 if (len > maxlen - 1)
1907 len = maxlen - 1;
1908
1909 if (*ppos > len)
1910 return 0;
1911 len = *ppos;
1912 } else {
1913 /* Start writing from beginning of buffer. */
1914 len = 0;
1915 }
1916
2ca9bb45 1917 *ppos += *lenp;
1da177e4 1918 p = buffer;
2ca9bb45 1919 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1920 if (get_user(c, p++))
1921 return -EFAULT;
1922 if (c == 0 || c == '\n')
1923 break;
2ca9bb45 1924 data[len++] = c;
1da177e4 1925 }
f8808300 1926 data[len] = 0;
1da177e4 1927 } else {
f5dd3d6f
SV		 1928 len = strlen(data);
1929 if (len > maxlen)
1930 len = maxlen;
8d060877
ON		 1931
1932 if (*ppos > len) {
1933 *lenp = 0;
1934 return 0;
1935 }
1936
1937 data += *ppos;
1938 len -= *ppos;
1939
1da177e4
LT		 1940 if (len > *lenp)
1941 len = *lenp;
1942 if (len)
f8808300 1943 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1944 return -EFAULT;
1945 if (len < *lenp) {
f8808300 1946 if (put_user('\n', buffer + len))
1da177e4
LT		 1947 return -EFAULT;
1948 len++;
1949 }
1950 *lenp = len;
1951 *ppos += len;
1952 }
1953 return 0;
1954}
1955
f4aacea2
KC		 1956static void warn_sysctl_write(struct ctl_table *table)
1957{
1958 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1959 "This will not be supported in the future. To silence this\n"
1960 "warning, set kernel.sysctl_writes_strict = -1\n",
1961 current->comm, table->procname);
1962}
1963
f5dd3d6f
SV		 1964/**
1965 * proc_dostring - read a string sysctl
1966 * @table: the sysctl table
1967 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 1968 * @buffer: the user buffer
1969 * @lenp: the size of the user buffer
1970 * @ppos: file position
1971 *
1972 * Reads/writes a string from/to the user buffer. If the kernel
1973 * buffer provided is not large enough to hold the string, the
1974 * string is truncated. The copied string is %NULL-terminated.
1975 * If the string is being read by the user process, it is copied
1976 * and a newline '\n' is added. It is truncated if the buffer is
1977 * not large enough.
1978 *
1979 * Returns 0 on success.
1980 */
8d65af78 1981int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 1982 void __user *buffer, size_t *lenp, loff_t *ppos)
1983{
f4aacea2
KC		 1984 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1985 warn_sysctl_write(table);
1986
f8808300
KC		 1987 return _proc_do_string((char *)(table->data), table->maxlen, write,
1988 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 1989}
1990
00b7c339
AW		 1991static size_t proc_skip_spaces(char **buf)
1992{
1993 size_t ret;
1994 char *tmp = skip_spaces(*buf);
1995 ret = tmp - *buf;
1996 *buf = tmp;
1997 return ret;
1998}
1999
9f977fb7
OP		 2000static void proc_skip_char(char **buf, size_t *size, const char v)
2001{
2002 while (*size) {
2003 if (**buf != v)
2004 break;
2005 (*size)--;
2006 (*buf)++;
2007 }
2008}
2009
00b7c339
AW		 2010#define TMPBUFLEN 22
2011/**
0fc377bd 2012 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2013 *
0fc377bd
RD		 2014 * @buf: a kernel buffer
2015 * @size: size of the kernel buffer
2016 * @val: this is where the number will be stored
2017 * @neg: set to %TRUE if number is negative
2018 * @perm_tr: a vector which contains the allowed trailers
2019 * @perm_tr_len: size of the perm_tr vector
2020 * @tr: pointer to store the trailer character
00b7c339 2021 *
0fc377bd
RD		 2022 * In case of success %0 is returned and @buf and @size are updated with
2023 * the amount of bytes read. If @tr is non-NULL and a trailing
2024 * character exists (size is non-zero after returning from this
2025 * function), @tr is updated with the trailing character.
00b7c339
AW		 2026 */
2027static int proc_get_long(char **buf, size_t *size,
2028 unsigned long *val, bool *neg,
2029 const char *perm_tr, unsigned perm_tr_len, char *tr)
2030{
2031 int len;
2032 char *p, tmp[TMPBUFLEN];
2033
2034 if (!*size)
2035 return -EINVAL;
2036
2037 len = *size;
2038 if (len > TMPBUFLEN - 1)
2039 len = TMPBUFLEN - 1;
2040
2041 memcpy(tmp, *buf, len);
2042
2043 tmp[len] = 0;
2044 p = tmp;
2045 if (*p == '-' && *size > 1) {
2046 *neg = true;
2047 p++;
2048 } else
2049 *neg = false;
2050 if (!isdigit(*p))
2051 return -EINVAL;
2052
2053 *val = simple_strtoul(p, &p, 0);
2054
2055 len = p - tmp;
2056
2057 /* We don't know if the next char is whitespace thus we may accept
2058 * invalid integers (e.g. 1234...a) or two integers instead of one
2059 * (e.g. 123...1). So lets not allow such large numbers. */
2060 if (len == TMPBUFLEN - 1)
2061 return -EINVAL;
2062
2063 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2064 return -EINVAL;
1da177e4 2065
00b7c339
AW		 2066 if (tr && (len < *size))
2067 *tr = *p;
2068
2069 *buf += len;
2070 *size -= len;
2071
2072 return 0;
2073}
2074
2075/**
0fc377bd 2076 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2077 *
0fc377bd
RD		 2078 * @buf: the user buffer
2079 * @size: the size of the user buffer
2080 * @val: the integer to be converted
2081 * @neg: sign of the number, %TRUE for negative
00b7c339 2082 *
0fc377bd
RD		 2083 * In case of success %0 is returned and @buf and @size are updated with
2084 * the amount of bytes written.
00b7c339
AW		 2085 */
2086static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2087 bool neg)
2088{
2089 int len;
2090 char tmp[TMPBUFLEN], *p = tmp;
2091
2092 sprintf(p, "%s%lu", neg ? "-" : "", val);
2093 len = strlen(tmp);
2094 if (len > *size)
2095 len = *size;
2096 if (copy_to_user(*buf, tmp, len))
2097 return -EFAULT;
2098 *size -= len;
2099 *buf += len;
2100 return 0;
2101}
2102#undef TMPBUFLEN
2103
2104static int proc_put_char(void __user **buf, size_t *size, char c)
2105{
2106 if (*size) {
2107 char __user **buffer = (char __user **)buf;
2108 if (put_user(c, *buffer))
2109 return -EFAULT;
2110 (*size)--, (*buffer)++;
2111 *buf = *buffer;
2112 }
2113 return 0;
2114}
1da177e4 2115
00b7c339 2116static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2117 int *valp,
2118 int write, void *data)
2119{
2120 if (write) {
230633d1
HS		 2121 if (*negp) {
2122 if (*lvalp > (unsigned long) INT_MAX + 1)
2123 return -EINVAL;
2124 *valp = -*lvalp;
2125 } else {
2126 if (*lvalp > (unsigned long) INT_MAX)
2127 return -EINVAL;
2128 *valp = *lvalp;
2129 }
1da177e4
LT		 2130 } else {
2131 int val = *valp;
2132 if (val < 0) {
00b7c339 2133 *negp = true;
9a5bc726 2134 *lvalp = -(unsigned long)val;
1da177e4 2135 } else {
00b7c339 2136 *negp = false;
1da177e4
LT		 2137 *lvalp = (unsigned long)val;
2138 }
2139 }
2140 return 0;
2141}
2142
00b7c339
AW		 2143static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2144
d8217f07 2145static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2146 int write, void __user *buffer,
fcfbd547 2147 size_t *lenp, loff_t *ppos,
00b7c339 2148 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2149 int write, void *data),
2150 void *data)
2151{
00b7c339 2152 int *i, vleft, first = 1, err = 0;
00b7c339 2153 size_t left;
70f6cbb6 2154 char *kbuf = NULL, *p;
1da177e4 2155
00b7c339 2156 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2157 *lenp = 0;
2158 return 0;
2159 }
2160
fcfbd547 2161 i = (int *) tbl_data;
1da177e4
LT		 2162 vleft = table->maxlen / sizeof(*i);
2163 left = *lenp;
2164
2165 if (!conv)
2166 conv = do_proc_dointvec_conv;
2167
00b7c339 2168 if (write) {
f4aacea2
KC		 2169 if (*ppos) {
2170 switch (sysctl_writes_strict) {
2171 case SYSCTL_WRITES_STRICT:
2172 goto out;
2173 case SYSCTL_WRITES_WARN:
2174 warn_sysctl_write(table);
2175 break;
2176 default:
2177 break;
2178 }
2179 }
2180
00b7c339
AW		 2181 if (left > PAGE_SIZE - 1)
2182 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2183 p = kbuf = memdup_user_nul(buffer, left);
2184 if (IS_ERR(kbuf))
2185 return PTR_ERR(kbuf);
00b7c339
AW		 2186 }
2187
1da177e4 2188 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2189 unsigned long lval;
2190 bool neg;
1da177e4 2191
00b7c339 2192 if (write) {
70f6cbb6 2193 left -= proc_skip_spaces(&p);
1da177e4 2194
563b0467
O		 2195 if (!left)
2196 break;
70f6cbb6 2197 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2198 proc_wspace_sep,
2199 sizeof(proc_wspace_sep), NULL);
2200 if (err)
1da177e4 2201 break;
00b7c339
AW		 2202 if (conv(&neg, &lval, i, 1, data)) {
2203 err = -EINVAL;
1da177e4 2204 break;
00b7c339 2205 }
1da177e4 2206 } else {
00b7c339
AW		 2207 if (conv(&neg, &lval, i, 0, data)) {
2208 err = -EINVAL;
2209 break;
2210 }
1da177e4 2211 if (!first)
00b7c339
AW		 2212 err = proc_put_char(&buffer, &left, '\t');
2213 if (err)
2214 break;
2215 err = proc_put_long(&buffer, &left, lval, neg);
2216 if (err)
1da177e4 2217 break;
1da177e4
LT		 2218 }
2219 }
2220
00b7c339
AW		 2221 if (!write && !first && left && !err)
2222 err = proc_put_char(&buffer, &left, '\n');
563b0467 2223 if (write && !err && left)
70f6cbb6 2224 left -= proc_skip_spaces(&p);
1da177e4 2225 if (write) {
70f6cbb6 2226 kfree(kbuf);
00b7c339
AW		 2227 if (first)
2228 return err ? : -EINVAL;
1da177e4 2229 }
1da177e4 2230 *lenp -= left;
f4aacea2 2231out:
1da177e4 2232 *ppos += *lenp;
00b7c339 2233 return err;
1da177e4
LT		 2234}
2235
8d65af78 2236static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2237 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2238 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2239 int write, void *data),
2240 void *data)
2241{
8d65af78 2242 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2243 buffer, lenp, ppos, conv, data);
2244}
2245
1da177e4
LT		 2246/**
2247 * proc_dointvec - read a vector of integers
2248 * @table: the sysctl table
2249 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2250 * @buffer: the user buffer
2251 * @lenp: the size of the user buffer
2252 * @ppos: file position
2253 *
2254 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2255 * values from/to the user buffer, treated as an ASCII string.
2256 *
2257 * Returns 0 on success.
2258 */
8d65af78 2259int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2260 void __user *buffer, size_t *lenp, loff_t *ppos)
2261{
8d65af78 2262 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2263 NULL,NULL);
2264}
2265
34f5a398 2266/*
25ddbb18
AK		 2267 * Taint values can only be increased
2268 * This means we can safely use a temporary.
34f5a398 2269 */
8d65af78 2270static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2271 void __user *buffer, size_t *lenp, loff_t *ppos)
2272{
25ddbb18
AK		 2273 struct ctl_table t;
2274 unsigned long tmptaint = get_taint();
2275 int err;
34f5a398 2276
91fcd412 2277 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2278 return -EPERM;
2279
25ddbb18
AK		 2280 t = *table;
2281 t.data = &tmptaint;
8d65af78 2282 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2283 if (err < 0)
2284 return err;
2285
2286 if (write) {
2287 /*
2288 * Poor man's atomic or. Not worth adding a primitive
2289 * to everyone's atomic.h for this
2290 */
2291 int i;
2292 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2293 if ((tmptaint >> i) & 1)
373d4d09 2294 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2295 }
2296 }
2297
2298 return err;
34f5a398
TT		 2299}
2300
bfdc0b49 2301#ifdef CONFIG_PRINTK
620f6e8e 2302static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2303 void __user *buffer, size_t *lenp, loff_t *ppos)
2304{
2305 if (write && !capable(CAP_SYS_ADMIN))
2306 return -EPERM;
2307
2308 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2309}
2310#endif
2311
1da177e4
LT		 2312struct do_proc_dointvec_minmax_conv_param {
2313 int *min;
2314 int *max;
2315};
2316
00b7c339
AW		 2317static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2318 int *valp,
1da177e4
LT		 2319 int write, void *data)
2320{
2321 struct do_proc_dointvec_minmax_conv_param *param = data;
2322 if (write) {
2323 int val = *negp ? -*lvalp : *lvalp;
2324 if ((param->min && *param->min > val) ||
2325 (param->max && *param->max < val))
2326 return -EINVAL;
2327 *valp = val;
2328 } else {
2329 int val = *valp;
2330 if (val < 0) {
00b7c339 2331 *negp = true;
9a5bc726 2332 *lvalp = -(unsigned long)val;
1da177e4 2333 } else {
00b7c339 2334 *negp = false;
1da177e4
LT		 2335 *lvalp = (unsigned long)val;
2336 }
2337 }
2338 return 0;
2339}
2340
2341/**
2342 * proc_dointvec_minmax - read a vector of integers with min/max values
2343 * @table: the sysctl table
2344 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2345 * @buffer: the user buffer
2346 * @lenp: the size of the user buffer
2347 * @ppos: file position
2348 *
2349 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2350 * values from/to the user buffer, treated as an ASCII string.
2351 *
2352 * This routine will ensure the values are within the range specified by
2353 * table->extra1 (min) and table->extra2 (max).
2354 *
2355 * Returns 0 on success.
2356 */
8d65af78 2357int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2358 void __user *buffer, size_t *lenp, loff_t *ppos)
2359{
2360 struct do_proc_dointvec_minmax_conv_param param = {
2361 .min = (int *) table->extra1,
2362 .max = (int *) table->extra2,
2363 };
8d65af78 2364 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2365 do_proc_dointvec_minmax_conv, &param);
2366}
2367
54b50199
KC		 2368static void validate_coredump_safety(void)
2369{
046d662f 2370#ifdef CONFIG_COREDUMP
e579d2c2 2371 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199
KC		 2372 core_pattern[0] != '/' && core_pattern[0] != '|') {
2373 printk(KERN_WARNING "Unsafe core_pattern used with "\
2374 "suid_dumpable=2. Pipe handler or fully qualified "\
2375 "core dump path required.\n");
2376 }
046d662f 2377#endif
54b50199
KC		 2378}
2379
2380static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2381 void __user *buffer, size_t *lenp, loff_t *ppos)
2382{
2383 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2384 if (!error)
2385 validate_coredump_safety();
2386 return error;
2387}
2388
046d662f 2389#ifdef CONFIG_COREDUMP
54b50199
KC		 2390static int proc_dostring_coredump(struct ctl_table *table, int write,
2391 void __user *buffer, size_t *lenp, loff_t *ppos)
2392{
2393 int error = proc_dostring(table, write, buffer, lenp, ppos);
2394 if (!error)
2395 validate_coredump_safety();
2396 return error;
2397}
046d662f 2398#endif
54b50199 2399
d8217f07 2400static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2401 void __user *buffer,
2402 size_t *lenp, loff_t *ppos,
2403 unsigned long convmul,
2404 unsigned long convdiv)
2405{
00b7c339
AW		 2406 unsigned long *i, *min, *max;
2407 int vleft, first = 1, err = 0;
00b7c339 2408 size_t left;
70f6cbb6 2409 char *kbuf = NULL, *p;
00b7c339
AW		 2410
2411 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2412 *lenp = 0;
2413 return 0;
2414 }
00b7c339 2415
fcfbd547 2416 i = (unsigned long *) data;
1da177e4
LT		 2417 min = (unsigned long *) table->extra1;
2418 max = (unsigned long *) table->extra2;
2419 vleft = table->maxlen / sizeof(unsigned long);
2420 left = *lenp;
00b7c339
AW		 2421
2422 if (write) {
f4aacea2
KC		 2423 if (*ppos) {
2424 switch (sysctl_writes_strict) {
2425 case SYSCTL_WRITES_STRICT:
2426 goto out;
2427 case SYSCTL_WRITES_WARN:
2428 warn_sysctl_write(table);
2429 break;
2430 default:
2431 break;
2432 }
2433 }
2434
00b7c339
AW		 2435 if (left > PAGE_SIZE - 1)
2436 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2437 p = kbuf = memdup_user_nul(buffer, left);
2438 if (IS_ERR(kbuf))
2439 return PTR_ERR(kbuf);
00b7c339
AW		 2440 }
2441
27b3d80a 2442 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2443 unsigned long val;
2444
1da177e4 2445 if (write) {
00b7c339
AW		 2446 bool neg;
2447
70f6cbb6 2448 left -= proc_skip_spaces(&p);
00b7c339 2449
70f6cbb6 2450 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2451 proc_wspace_sep,
2452 sizeof(proc_wspace_sep), NULL);
2453 if (err)
1da177e4
LT		 2454 break;
2455 if (neg)
1da177e4
LT		 2456 continue;
2457 if ((min && val < *min) || (max && val > *max))
2458 continue;
2459 *i = val;
2460 } else {
00b7c339 2461 val = convdiv * (*i) / convmul;
7833819d 2462 if (!first) {
00b7c339 2463 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2464 if (err)
2465 break;
2466 }
00b7c339
AW		 2467 err = proc_put_long(&buffer, &left, val, false);
2468 if (err)
2469 break;
1da177e4
LT		 2470 }
2471 }
2472
00b7c339
AW		 2473 if (!write && !first && left && !err)
2474 err = proc_put_char(&buffer, &left, '\n');
2475 if (write && !err)
70f6cbb6 2476 left -= proc_skip_spaces(&p);
1da177e4 2477 if (write) {
70f6cbb6 2478 kfree(kbuf);
00b7c339
AW		 2479 if (first)
2480 return err ? : -EINVAL;
1da177e4 2481 }
1da177e4 2482 *lenp -= left;
f4aacea2 2483out:
1da177e4 2484 *ppos += *lenp;
00b7c339 2485 return err;
1da177e4
LT		 2486}
2487
d8217f07 2488static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2489 void __user *buffer,
2490 size_t *lenp, loff_t *ppos,
2491 unsigned long convmul,
2492 unsigned long convdiv)
2493{
2494 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2495 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2496}
2497
1da177e4
LT		 2498/**
2499 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2500 * @table: the sysctl table
2501 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2502 * @buffer: the user buffer
2503 * @lenp: the size of the user buffer
2504 * @ppos: file position
2505 *
2506 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2507 * values from/to the user buffer, treated as an ASCII string.
2508 *
2509 * This routine will ensure the values are within the range specified by
2510 * table->extra1 (min) and table->extra2 (max).
2511 *
2512 * Returns 0 on success.
2513 */
8d65af78 2514int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2515 void __user *buffer, size_t *lenp, loff_t *ppos)
2516{
8d65af78 2517 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2518}
2519
2520/**
2521 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2522 * @table: the sysctl table
2523 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2524 * @buffer: the user buffer
2525 * @lenp: the size of the user buffer
2526 * @ppos: file position
2527 *
2528 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2529 * values from/to the user buffer, treated as an ASCII string. The values
2530 * are treated as milliseconds, and converted to jiffies when they are stored.
2531 *
2532 * This routine will ensure the values are within the range specified by
2533 * table->extra1 (min) and table->extra2 (max).
2534 *
2535 * Returns 0 on success.
2536 */
d8217f07 2537int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2538 void __user *buffer,
2539 size_t *lenp, loff_t *ppos)
2540{
8d65af78 2541 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2542 lenp, ppos, HZ, 1000l);
2543}
2544
2545
00b7c339 2546static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2547 int *valp,
2548 int write, void *data)
2549{
2550 if (write) {
cba9f33d
BS		 2551 if (*lvalp > LONG_MAX / HZ)
2552 return 1;
1da177e4
LT		 2553 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2554 } else {
2555 int val = *valp;
2556 unsigned long lval;
2557 if (val < 0) {
00b7c339 2558 *negp = true;
9a5bc726 2559 lval = -(unsigned long)val;
1da177e4 2560 } else {
00b7c339 2561 *negp = false;
1da177e4
LT		 2562 lval = (unsigned long)val;
2563 }
2564 *lvalp = lval / HZ;
2565 }
2566 return 0;
2567}
2568
00b7c339 2569static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2570 int *valp,
2571 int write, void *data)
2572{
2573 if (write) {
cba9f33d
BS		 2574 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2575 return 1;
1da177e4
LT		 2576 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2577 } else {
2578 int val = *valp;
2579 unsigned long lval;
2580 if (val < 0) {
00b7c339 2581 *negp = true;
9a5bc726 2582 lval = -(unsigned long)val;
1da177e4 2583 } else {
00b7c339 2584 *negp = false;
1da177e4
LT		 2585 lval = (unsigned long)val;
2586 }
2587 *lvalp = jiffies_to_clock_t(lval);
2588 }
2589 return 0;
2590}
2591
00b7c339 2592static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2593 int *valp,
2594 int write, void *data)
2595{
2596 if (write) {
d738ce8f
FF		 2597 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2598
2599 if (jif > INT_MAX)
2600 return 1;
2601 *valp = (int)jif;
1da177e4
LT		 2602 } else {
2603 int val = *valp;
2604 unsigned long lval;
2605 if (val < 0) {
00b7c339 2606 *negp = true;
9a5bc726 2607 lval = -(unsigned long)val;
1da177e4 2608 } else {
00b7c339 2609 *negp = false;
1da177e4
LT		 2610 lval = (unsigned long)val;
2611 }
2612 *lvalp = jiffies_to_msecs(lval);
2613 }
2614 return 0;
2615}
2616
2617/**
2618 * proc_dointvec_jiffies - read a vector of integers as seconds
2619 * @table: the sysctl table
2620 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2621 * @buffer: the user buffer
2622 * @lenp: the size of the user buffer
2623 * @ppos: file position
2624 *
2625 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2626 * values from/to the user buffer, treated as an ASCII string.
2627 * The values read are assumed to be in seconds, and are converted into
2628 * jiffies.
2629 *
2630 * Returns 0 on success.
2631 */
8d65af78 2632int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2633 void __user *buffer, size_t *lenp, loff_t *ppos)
2634{
8d65af78 2635 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2636 do_proc_dointvec_jiffies_conv,NULL);
2637}
2638
2639/**
2640 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2641 * @table: the sysctl table
2642 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2643 * @buffer: the user buffer
2644 * @lenp: the size of the user buffer
1e5d5331 2645 * @ppos: pointer to the file position
1da177e4
LT		 2646 *
2647 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2648 * values from/to the user buffer, treated as an ASCII string.
2649 * The values read are assumed to be in 1/USER_HZ seconds, and
2650 * are converted into jiffies.
2651 *
2652 * Returns 0 on success.
2653 */
8d65af78 2654int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2655 void __user *buffer, size_t *lenp, loff_t *ppos)
2656{
8d65af78 2657 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2658 do_proc_dointvec_userhz_jiffies_conv,NULL);
2659}
2660
2661/**
2662 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2663 * @table: the sysctl table
2664 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2665 * @buffer: the user buffer
2666 * @lenp: the size of the user buffer
67be2dd1
MW		 2667 * @ppos: file position
2668 * @ppos: the current position in the file
1da177e4
LT		 2669 *
2670 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2671 * values from/to the user buffer, treated as an ASCII string.
2672 * The values read are assumed to be in 1/1000 seconds, and
2673 * are converted into jiffies.
2674 *
2675 * Returns 0 on success.
2676 */
8d65af78 2677int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2678 void __user *buffer, size_t *lenp, loff_t *ppos)
2679{
8d65af78 2680 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2681 do_proc_dointvec_ms_jiffies_conv, NULL);
2682}
2683
8d65af78 2684static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2685 void __user *buffer, size_t *lenp, loff_t *ppos)
2686{
2687 struct pid *new_pid;
2688 pid_t tmp;
2689 int r;
2690
6c5f3e7b 2691 tmp = pid_vnr(cad_pid);
9ec52099 2692
8d65af78 2693 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2694 lenp, ppos, NULL, NULL);
2695 if (r || !write)
2696 return r;
2697
2698 new_pid = find_get_pid(tmp);
2699 if (!new_pid)
2700 return -ESRCH;
2701
2702 put_pid(xchg(&cad_pid, new_pid));
2703 return 0;
2704}
2705
9f977fb7
OP		 2706/**
2707 * proc_do_large_bitmap - read/write from/to a large bitmap
2708 * @table: the sysctl table
2709 * @write: %TRUE if this is a write to the sysctl file
2710 * @buffer: the user buffer
2711 * @lenp: the size of the user buffer
2712 * @ppos: file position
2713 *
2714 * The bitmap is stored at table->data and the bitmap length (in bits)
2715 * in table->maxlen.
2716 *
2717 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2718 * large bitmaps may be represented in a compact manner. Writing into
2719 * the file will clear the bitmap then update it with the given input.
2720 *
2721 * Returns 0 on success.
2722 */
2723int proc_do_large_bitmap(struct ctl_table *table, int write,
2724 void __user *buffer, size_t *lenp, loff_t *ppos)
2725{
2726 int err = 0;
2727 bool first = 1;
2728 size_t left = *lenp;
2729 unsigned long bitmap_len = table->maxlen;
122ff243 2730 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2731 unsigned long *tmp_bitmap = NULL;
2732 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2733
122ff243 2734 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2735 *lenp = 0;
2736 return 0;
2737 }
2738
2739 if (write) {
70f6cbb6 2740 char *kbuf, *p;
9f977fb7
OP		 2741
2742 if (left > PAGE_SIZE - 1)
2743 left = PAGE_SIZE - 1;
2744
70f6cbb6
AV		 2745 p = kbuf = memdup_user_nul(buffer, left);
2746 if (IS_ERR(kbuf))
2747 return PTR_ERR(kbuf);
9f977fb7
OP		 2748
2749 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2750 GFP_KERNEL);
2751 if (!tmp_bitmap) {
70f6cbb6 2752 kfree(kbuf);
9f977fb7
OP		 2753 return -ENOMEM;
2754 }
70f6cbb6 2755 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 2756 while (!err && left) {
2757 unsigned long val_a, val_b;
2758 bool neg;
2759
70f6cbb6 2760 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 2761 sizeof(tr_a), &c);
2762 if (err)
2763 break;
2764 if (val_a >= bitmap_len || neg) {
2765 err = -EINVAL;
2766 break;
2767 }
2768
2769 val_b = val_a;
2770 if (left) {
70f6cbb6 2771 p++;
9f977fb7
OP		 2772 left--;
2773 }
2774
2775 if (c == '-') {
70f6cbb6 2776 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 2777 &neg, tr_b, sizeof(tr_b),
2778 &c);
2779 if (err)
2780 break;
2781 if (val_b >= bitmap_len || neg ||
2782 val_a > val_b) {
2783 err = -EINVAL;
2784 break;
2785 }
2786 if (left) {
70f6cbb6 2787 p++;
9f977fb7
OP		 2788 left--;
2789 }
2790 }
2791
5a04cca6 2792 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 2793 first = 0;
70f6cbb6 2794 proc_skip_char(&p, &left, '\n');
9f977fb7 2795 }
70f6cbb6 2796 kfree(kbuf);
9f977fb7
OP		 2797 } else {
2798 unsigned long bit_a, bit_b = 0;
2799
2800 while (left) {
2801 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2802 if (bit_a >= bitmap_len)
2803 break;
2804 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2805 bit_a + 1) - 1;
2806
2807 if (!first) {
2808 err = proc_put_char(&buffer, &left, ',');
2809 if (err)
2810 break;
2811 }
2812 err = proc_put_long(&buffer, &left, bit_a, false);
2813 if (err)
2814 break;
2815 if (bit_a != bit_b) {
2816 err = proc_put_char(&buffer, &left, '-');
2817 if (err)
2818 break;
2819 err = proc_put_long(&buffer, &left, bit_b, false);
2820 if (err)
2821 break;
2822 }
2823
2824 first = 0; bit_b++;
2825 }
2826 if (!err)
2827 err = proc_put_char(&buffer, &left, '\n');
2828 }
2829
2830 if (!err) {
2831 if (write) {
2832 if (*ppos)
2833 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2834 else
5a04cca6 2835 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 2836 }
2837 kfree(tmp_bitmap);
2838 *lenp -= left;
2839 *ppos += *lenp;
2840 return 0;
2841 } else {
2842 kfree(tmp_bitmap);
2843 return err;
2844 }
2845}
2846
55610500 2847#else /* CONFIG_PROC_SYSCTL */
1da177e4 2848
8d65af78 2849int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2850 void __user *buffer, size_t *lenp, loff_t *ppos)
2851{
2852 return -ENOSYS;
2853}
2854
8d65af78 2855int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2856 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2857{
2858 return -ENOSYS;
2859}
2860
8d65af78 2861int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2862 void __user *buffer, size_t *lenp, loff_t *ppos)
2863{
2864 return -ENOSYS;
2865}
2866
8d65af78 2867int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2868 void __user *buffer, size_t *lenp, loff_t *ppos)
2869{
2870 return -ENOSYS;
2871}
2872
8d65af78 2873int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2874 void __user *buffer, size_t *lenp, loff_t *ppos)
2875{
2876 return -ENOSYS;
2877}
2878
8d65af78 2879int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2880 void __user *buffer, size_t *lenp, loff_t *ppos)
2881{
2882 return -ENOSYS;
2883}
2884
8d65af78 2885int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2886 void __user *buffer, size_t *lenp, loff_t *ppos)
2887{
2888 return -ENOSYS;
2889}
2890
d8217f07 2891int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2892 void __user *buffer,
2893 size_t *lenp, loff_t *ppos)
2894{
2895 return -ENOSYS;
2896}
2897
2898
55610500 2899#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2900
1da177e4
LT		 2901/*
2902 * No sense putting this after each symbol definition, twice,
2903 * exception granted :-)
2904 */
2905EXPORT_SYMBOL(proc_dointvec);
2906EXPORT_SYMBOL(proc_dointvec_jiffies);
2907EXPORT_SYMBOL(proc_dointvec_minmax);
2908EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2909EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2910EXPORT_SYMBOL(proc_dostring);
2911EXPORT_SYMBOL(proc_doulongvec_minmax);
2912EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux 6.x block layer and io_uring tree(s)