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xenbus: don't BUG() on user mode induced condition
[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>
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 },
eaf06b24
DR		 816 {
817 .procname = "dmesg_restrict",
818 .data = &dmesg_restrict,
819 .maxlen = sizeof(int),
820 .mode = 0644,
620f6e8e 821 .proc_handler = proc_dointvec_minmax_sysadmin,
eaf06b24
DR		 822 .extra1 = &zero,
823 .extra2 = &one,
824 },
455cd5ab
DR		 825 {
826 .procname = "kptr_restrict",
827 .data = &kptr_restrict,
828 .maxlen = sizeof(int),
829 .mode = 0644,
620f6e8e 830 .proc_handler = proc_dointvec_minmax_sysadmin,
455cd5ab
DR		 831 .extra1 = &zero,
832 .extra2 = &two,
833 },
df6e61d4 834#endif
1da177e4 835 {
1da177e4
LT		 836 .procname = "ngroups_max",
837 .data = &ngroups_max,
838 .maxlen = sizeof (int),
839 .mode = 0444,
6d456111 840 .proc_handler = proc_dointvec,
1da177e4 841 },
73efc039
DB		 842 {
843 .procname = "cap_last_cap",
844 .data = (void *)&cap_last_cap,
845 .maxlen = sizeof(int),
846 .mode = 0444,
847 .proc_handler = proc_dointvec,
848 },
58687acb 849#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 850 {
58687acb 851 .procname = "watchdog",
3c00ea82 852 .data = &watchdog_user_enabled,
504d7cf1
DZ		 853 .maxlen = sizeof (int),
854 .mode = 0644,
195daf66 855 .proc_handler = proc_watchdog,
586692a5
MSB		 856 .extra1 = &zero,
857 .extra2 = &one,
58687acb
DZ		 858 },
859 {
860 .procname = "watchdog_thresh",
586692a5 861 .data = &watchdog_thresh,
58687acb
DZ		 862 .maxlen = sizeof(int),
863 .mode = 0644,
195daf66 864 .proc_handler = proc_watchdog_thresh,
a6572f84 865 .extra1 = &zero,
58687acb 866 .extra2 = &sixty,
504d7cf1 867 },
195daf66
UO		 868 {
869 .procname = "nmi_watchdog",
870 .data = &nmi_watchdog_enabled,
871 .maxlen = sizeof (int),
872 .mode = 0644,
873 .proc_handler = proc_nmi_watchdog,
874 .extra1 = &zero,
875#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
876 .extra2 = &one,
877#else
878 .extra2 = &zero,
879#endif
880 },
881 {
882 .procname = "soft_watchdog",
883 .data = &soft_watchdog_enabled,
884 .maxlen = sizeof (int),
885 .mode = 0644,
886 .proc_handler = proc_soft_watchdog,
887 .extra1 = &zero,
888 .extra2 = &one,
889 },
fe4ba3c3
CM		 890 {
891 .procname = "watchdog_cpumask",
892 .data = &watchdog_cpumask_bits,
893 .maxlen = NR_CPUS,
894 .mode = 0644,
895 .proc_handler = proc_watchdog_cpumask,
896 },
2508ce18
DZ		 897 {
898 .procname = "softlockup_panic",
899 .data = &softlockup_panic,
900 .maxlen = sizeof(int),
901 .mode = 0644,
902 .proc_handler = proc_dointvec_minmax,
903 .extra1 = &zero,
904 .extra2 = &one,
905 },
ac1f5912
DZ		 906#ifdef CONFIG_HARDLOCKUP_DETECTOR
907 {
908 .procname = "hardlockup_panic",
909 .data = &hardlockup_panic,
910 .maxlen = sizeof(int),
911 .mode = 0644,
912 .proc_handler = proc_dointvec_minmax,
913 .extra1 = &zero,
914 .extra2 = &one,
915 },
916#endif
ed235875
AT		 917#ifdef CONFIG_SMP
918 {
919 .procname = "softlockup_all_cpu_backtrace",
920 .data = &sysctl_softlockup_all_cpu_backtrace,
921 .maxlen = sizeof(int),
922 .mode = 0644,
923 .proc_handler = proc_dointvec_minmax,
924 .extra1 = &zero,
925 .extra2 = &one,
926 },
55537871
JK		 927 {
928 .procname = "hardlockup_all_cpu_backtrace",
929 .data = &sysctl_hardlockup_all_cpu_backtrace,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_dointvec_minmax,
933 .extra1 = &zero,
934 .extra2 = &one,
935 },
ed235875 936#endif /* CONFIG_SMP */
5dc30558
DZ		 937#endif
938#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
939 {
940 .procname = "unknown_nmi_panic",
941 .data = &unknown_nmi_panic,
942 .maxlen = sizeof (int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec,
945 },
504d7cf1 946#endif
1da177e4 947#if defined(CONFIG_X86)
8da5adda 948 {
8da5adda
DZ		 949 .procname = "panic_on_unrecovered_nmi",
950 .data = &panic_on_unrecovered_nmi,
951 .maxlen = sizeof(int),
952 .mode = 0644,
6d456111 953 .proc_handler = proc_dointvec,
8da5adda 954 },
5211a242 955 {
5211a242
KG		 956 .procname = "panic_on_io_nmi",
957 .data = &panic_on_io_nmi,
958 .maxlen = sizeof(int),
959 .mode = 0644,
6d456111 960 .proc_handler = proc_dointvec,
5211a242 961 },
55af7796
MH		 962#ifdef CONFIG_DEBUG_STACKOVERFLOW
963 {
964 .procname = "panic_on_stackoverflow",
965 .data = &sysctl_panic_on_stackoverflow,
966 .maxlen = sizeof(int),
967 .mode = 0644,
968 .proc_handler = proc_dointvec,
969 },
970#endif
1da177e4 971 {
1da177e4
LT		 972 .procname = "bootloader_type",
973 .data = &bootloader_type,
974 .maxlen = sizeof (int),
975 .mode = 0444,
6d456111 976 .proc_handler = proc_dointvec,
1da177e4 977 },
5031296c 978 {
5031296c
PA		 979 .procname = "bootloader_version",
980 .data = &bootloader_version,
981 .maxlen = sizeof (int),
982 .mode = 0444,
6d456111 983 .proc_handler = proc_dointvec,
5031296c 984 },
0741f4d2 985 {
0741f4d2
CE		 986 .procname = "kstack_depth_to_print",
987 .data = &kstack_depth_to_print,
988 .maxlen = sizeof(int),
989 .mode = 0644,
6d456111 990 .proc_handler = proc_dointvec,
0741f4d2 991 },
6e7c4025 992 {
6e7c4025
IM		 993 .procname = "io_delay_type",
994 .data = &io_delay_type,
995 .maxlen = sizeof(int),
996 .mode = 0644,
6d456111 997 .proc_handler = proc_dointvec,
6e7c4025 998 },
1da177e4 999#endif
7a9166e3 1000#if defined(CONFIG_MMU)
1da177e4 1001 {
1da177e4
LT		 1002 .procname = "randomize_va_space",
1003 .data = &randomize_va_space,
1004 .maxlen = sizeof(int),
1005 .mode = 0644,
6d456111 1006 .proc_handler = proc_dointvec,
1da177e4 1007 },
7a9166e3 1008#endif
0152fb37 1009#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1010 {
951f22d5
MS		 1011 .procname = "spin_retry",
1012 .data = &spin_retry,
1013 .maxlen = sizeof (int),
1014 .mode = 0644,
6d456111 1015 .proc_handler = proc_dointvec,
951f22d5 1016 },
c255d844 1017#endif
673d5b43 1018#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1019 {
c255d844 1020 .procname = "acpi_video_flags",
77afcf78 1021 .data = &acpi_realmode_flags,
c255d844
PM		 1022 .maxlen = sizeof (unsigned long),
1023 .mode = 0644,
6d456111 1024 .proc_handler = proc_doulongvec_minmax,
c255d844 1025 },
d2b176ed 1026#endif
b6fca725 1027#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1028 {
d2b176ed
JS		 1029 .procname = "ignore-unaligned-usertrap",
1030 .data = &no_unaligned_warning,
1031 .maxlen = sizeof (int),
1032 .mode = 0644,
6d456111 1033 .proc_handler = proc_dointvec,
d2b176ed 1034 },
b6fca725
VG		 1035#endif
1036#ifdef CONFIG_IA64
88fc241f 1037 {
88fc241f
DC		 1038 .procname = "unaligned-dump-stack",
1039 .data = &unaligned_dump_stack,
1040 .maxlen = sizeof (int),
1041 .mode = 0644,
6d456111 1042 .proc_handler = proc_dointvec,
88fc241f 1043 },
bebfa101 1044#endif
e162b39a
MSB		 1045#ifdef CONFIG_DETECT_HUNG_TASK
1046 {
e162b39a
MSB		 1047 .procname = "hung_task_panic",
1048 .data = &sysctl_hung_task_panic,
1049 .maxlen = sizeof(int),
1050 .mode = 0644,
6d456111 1051 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 1052 .extra1 = &zero,
1053 .extra2 = &one,
1054 },
82a1fcb9 1055 {
82a1fcb9
IM		 1056 .procname = "hung_task_check_count",
1057 .data = &sysctl_hung_task_check_count,
cd64647f 1058 .maxlen = sizeof(int),
82a1fcb9 1059 .mode = 0644,
cd64647f
LZ		 1060 .proc_handler = proc_dointvec_minmax,
1061 .extra1 = &zero,
82a1fcb9
IM		 1062 },
1063 {
82a1fcb9
IM		 1064 .procname = "hung_task_timeout_secs",
1065 .data = &sysctl_hung_task_timeout_secs,
90739081 1066 .maxlen = sizeof(unsigned long),
82a1fcb9 1067 .mode = 0644,
6d456111 1068 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1069 .extra2 = &hung_task_timeout_max,
82a1fcb9
IM		 1070 },
1071 {
82a1fcb9
IM		 1072 .procname = "hung_task_warnings",
1073 .data = &sysctl_hung_task_warnings,
270750db 1074 .maxlen = sizeof(int),
82a1fcb9 1075 .mode = 0644,
270750db
AT		 1076 .proc_handler = proc_dointvec_minmax,
1077 .extra1 = &neg_one,
82a1fcb9 1078 },
c4f3b63f 1079#endif
bebfa101
AK		 1080#ifdef CONFIG_COMPAT
1081 {
bebfa101
AK		 1082 .procname = "compat-log",
1083 .data = &compat_log,
1084 .maxlen = sizeof (int),
1085 .mode = 0644,
6d456111 1086 .proc_handler = proc_dointvec,
bebfa101 1087 },
951f22d5 1088#endif
23f78d4a
IM		 1089#ifdef CONFIG_RT_MUTEXES
1090 {
23f78d4a
IM		 1091 .procname = "max_lock_depth",
1092 .data = &max_lock_depth,
1093 .maxlen = sizeof(int),
1094 .mode = 0644,
6d456111 1095 .proc_handler = proc_dointvec,
23f78d4a 1096 },
5096add8 1097#endif
10a0a8d4 1098 {
10a0a8d4
JF		 1099 .procname = "poweroff_cmd",
1100 .data = &poweroff_cmd,
1101 .maxlen = POWEROFF_CMD_PATH_LEN,
1102 .mode = 0644,
6d456111 1103 .proc_handler = proc_dostring,
10a0a8d4 1104 },
0b77f5bf
DH		 1105#ifdef CONFIG_KEYS
1106 {
0b77f5bf
DH		 1107 .procname = "keys",
1108 .mode = 0555,
1109 .child = key_sysctls,
1110 },
1111#endif
cdd6c482 1112#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1113 /*
1114 * User-space scripts rely on the existence of this file
1115 * as a feature check for perf_events being enabled.
1116 *
1117 * So it's an ABI, do not remove!
1118 */
1ccd1549 1119 {
cdd6c482
IM		 1120 .procname = "perf_event_paranoid",
1121 .data = &sysctl_perf_event_paranoid,
1122 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1123 .mode = 0644,
6d456111 1124 .proc_handler = proc_dointvec,
1ccd1549 1125 },
c5078f78 1126 {
cdd6c482
IM		 1127 .procname = "perf_event_mlock_kb",
1128 .data = &sysctl_perf_event_mlock,
1129 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1130 .mode = 0644,
6d456111 1131 .proc_handler = proc_dointvec,
c5078f78 1132 },
a78ac325 1133 {
cdd6c482
IM		 1134 .procname = "perf_event_max_sample_rate",
1135 .data = &sysctl_perf_event_sample_rate,
1136 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1137 .mode = 0644,
163ec435 1138 .proc_handler = perf_proc_update_handler,
723478c8 1139 .extra1 = &one,
a78ac325 1140 },
14c63f17
DH		 1141 {
1142 .procname = "perf_cpu_time_max_percent",
1143 .data = &sysctl_perf_cpu_time_max_percent,
1144 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1145 .mode = 0644,
1146 .proc_handler = perf_cpu_time_max_percent_handler,
1147 .extra1 = &zero,
1148 .extra2 = &one_hundred,
1149 },
c5dfd78e
ACM		 1150 {
1151 .procname = "perf_event_max_stack",
a831100a 1152 .data = &sysctl_perf_event_max_stack,
c5dfd78e
ACM		 1153 .maxlen = sizeof(sysctl_perf_event_max_stack),
1154 .mode = 0644,
1155 .proc_handler = perf_event_max_stack_handler,
1156 .extra1 = &zero,
1157 .extra2 = &six_hundred_forty_kb,
1158 },
c85b0334
ACM		 1159 {
1160 .procname = "perf_event_max_contexts_per_stack",
1161 .data = &sysctl_perf_event_max_contexts_per_stack,
1162 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1163 .mode = 0644,
1164 .proc_handler = perf_event_max_stack_handler,
1165 .extra1 = &zero,
1166 .extra2 = &one_thousand,
1167 },
1ccd1549 1168#endif
dfec072e
VN		 1169#ifdef CONFIG_KMEMCHECK
1170 {
dfec072e
VN		 1171 .procname = "kmemcheck",
1172 .data = &kmemcheck_enabled,
1173 .maxlen = sizeof(int),
1174 .mode = 0644,
6d456111 1175 .proc_handler = proc_dointvec,
dfec072e 1176 },
cb684b5b 1177#endif
9e3961a0
PB		 1178 {
1179 .procname = "panic_on_warn",
1180 .data = &panic_on_warn,
1181 .maxlen = sizeof(int),
1182 .mode = 0644,
1183 .proc_handler = proc_dointvec_minmax,
1184 .extra1 = &zero,
1185 .extra2 = &one,
1186 },
bc7a34b8
TG		 1187#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1188 {
1189 .procname = "timer_migration",
1190 .data = &sysctl_timer_migration,
1191 .maxlen = sizeof(unsigned int),
1192 .mode = 0644,
1193 .proc_handler = timer_migration_handler,
1194 },
1be7f75d
AS		 1195#endif
1196#ifdef CONFIG_BPF_SYSCALL
1197 {
1198 .procname = "unprivileged_bpf_disabled",
1199 .data = &sysctl_unprivileged_bpf_disabled,
1200 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1201 .mode = 0644,
1202 /* only handle a transition from default "0" to "1" */
1203 .proc_handler = proc_dointvec_minmax,
1204 .extra1 = &one,
1205 .extra2 = &one,
1206 },
bc7a34b8 1207#endif
6fce56ec 1208 { }
1da177e4
LT		 1209};
1210
d8217f07 1211static struct ctl_table vm_table[] = {
1da177e4 1212 {
1da177e4
LT		 1213 .procname = "overcommit_memory",
1214 .data = &sysctl_overcommit_memory,
1215 .maxlen = sizeof(sysctl_overcommit_memory),
1216 .mode = 0644,
cb16e95f
PH		 1217 .proc_handler = proc_dointvec_minmax,
1218 .extra1 = &zero,
1219 .extra2 = &two,
1da177e4 1220 },
fadd8fbd 1221 {
fadd8fbd
KH		 1222 .procname = "panic_on_oom",
1223 .data = &sysctl_panic_on_oom,
1224 .maxlen = sizeof(sysctl_panic_on_oom),
1225 .mode = 0644,
cb16e95f
PH		 1226 .proc_handler = proc_dointvec_minmax,
1227 .extra1 = &zero,
1228 .extra2 = &two,
fadd8fbd 1229 },
fe071d7e 1230 {
fe071d7e
DR		 1231 .procname = "oom_kill_allocating_task",
1232 .data = &sysctl_oom_kill_allocating_task,
1233 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1234 .mode = 0644,
6d456111 1235 .proc_handler = proc_dointvec,
fe071d7e 1236 },
fef1bdd6 1237 {
fef1bdd6
DR		 1238 .procname = "oom_dump_tasks",
1239 .data = &sysctl_oom_dump_tasks,
1240 .maxlen = sizeof(sysctl_oom_dump_tasks),
1241 .mode = 0644,
6d456111 1242 .proc_handler = proc_dointvec,
fef1bdd6 1243 },
1da177e4 1244 {
1da177e4
LT		 1245 .procname = "overcommit_ratio",
1246 .data = &sysctl_overcommit_ratio,
1247 .maxlen = sizeof(sysctl_overcommit_ratio),
1248 .mode = 0644,
49f0ce5f
JM		 1249 .proc_handler = overcommit_ratio_handler,
1250 },
1251 {
1252 .procname = "overcommit_kbytes",
1253 .data = &sysctl_overcommit_kbytes,
1254 .maxlen = sizeof(sysctl_overcommit_kbytes),
1255 .mode = 0644,
1256 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1257 },
1258 {
1da177e4
LT		 1259 .procname = "page-cluster",
1260 .data = &page_cluster,
1261 .maxlen = sizeof(int),
1262 .mode = 0644,
cb16e95f
PH		 1263 .proc_handler = proc_dointvec_minmax,
1264 .extra1 = &zero,
1da177e4
LT		 1265 },
1266 {
1da177e4
LT		 1267 .procname = "dirty_background_ratio",
1268 .data = &dirty_background_ratio,
1269 .maxlen = sizeof(dirty_background_ratio),
1270 .mode = 0644,
6d456111 1271 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1272 .extra1 = &zero,
1273 .extra2 = &one_hundred,
1274 },
2da02997 1275 {
2da02997
DR		 1276 .procname = "dirty_background_bytes",
1277 .data = &dirty_background_bytes,
1278 .maxlen = sizeof(dirty_background_bytes),
1279 .mode = 0644,
6d456111 1280 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1281 .extra1 = &one_ul,
2da02997 1282 },
1da177e4 1283 {
1da177e4
LT		 1284 .procname = "dirty_ratio",
1285 .data = &vm_dirty_ratio,
1286 .maxlen = sizeof(vm_dirty_ratio),
1287 .mode = 0644,
6d456111 1288 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1289 .extra1 = &zero,
1290 .extra2 = &one_hundred,
1291 },
2da02997 1292 {
2da02997
DR		 1293 .procname = "dirty_bytes",
1294 .data = &vm_dirty_bytes,
1295 .maxlen = sizeof(vm_dirty_bytes),
1296 .mode = 0644,
6d456111 1297 .proc_handler = dirty_bytes_handler,
9e4a5bda 1298 .extra1 = &dirty_bytes_min,
2da02997 1299 },
1da177e4 1300 {
1da177e4 1301 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1302 .data = &dirty_writeback_interval,
1303 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1304 .mode = 0644,
6d456111 1305 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1306 },
1307 {
1da177e4 1308 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1309 .data = &dirty_expire_interval,
1310 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1311 .mode = 0644,
cb16e95f
PH		 1312 .proc_handler = proc_dointvec_minmax,
1313 .extra1 = &zero,
1da177e4 1314 },
1efff914
TT		 1315 {
1316 .procname = "dirtytime_expire_seconds",
1317 .data = &dirtytime_expire_interval,
1318 .maxlen = sizeof(dirty_expire_interval),
1319 .mode = 0644,
1320 .proc_handler = dirtytime_interval_handler,
1321 .extra1 = &zero,
1322 },
1da177e4 1323 {
3965c9ae
WL		 1324 .procname = "nr_pdflush_threads",
1325 .mode = 0444 /* read-only */,
1326 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1327 },
1328 {
1da177e4
LT		 1329 .procname = "swappiness",
1330 .data = &vm_swappiness,
1331 .maxlen = sizeof(vm_swappiness),
1332 .mode = 0644,
6d456111 1333 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1334 .extra1 = &zero,
1335 .extra2 = &one_hundred,
1336 },
1337#ifdef CONFIG_HUGETLB_PAGE
06808b08 1338 {
1da177e4 1339 .procname = "nr_hugepages",
e5ff2159 1340 .data = NULL,
1da177e4
LT		 1341 .maxlen = sizeof(unsigned long),
1342 .mode = 0644,
6d456111 1343 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1344 },
1345#ifdef CONFIG_NUMA
1346 {
1347 .procname = "nr_hugepages_mempolicy",
1348 .data = NULL,
1349 .maxlen = sizeof(unsigned long),
1350 .mode = 0644,
1351 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1352 },
1353#endif
1da177e4 1354 {
1da177e4
LT		 1355 .procname = "hugetlb_shm_group",
1356 .data = &sysctl_hugetlb_shm_group,
1357 .maxlen = sizeof(gid_t),
1358 .mode = 0644,
6d456111 1359 .proc_handler = proc_dointvec,
1da177e4 1360 },
396faf03 1361 {
396faf03
MG		 1362 .procname = "hugepages_treat_as_movable",
1363 .data = &hugepages_treat_as_movable,
1364 .maxlen = sizeof(int),
1365 .mode = 0644,
86cdb465 1366 .proc_handler = proc_dointvec,
396faf03 1367 },
d1c3fb1f 1368 {
d1c3fb1f 1369 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1370 .data = NULL,
1371 .maxlen = sizeof(unsigned long),
d1c3fb1f 1372 .mode = 0644,
6d456111 1373 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1374 },
1da177e4
LT		 1375#endif
1376 {
1da177e4
LT		 1377 .procname = "lowmem_reserve_ratio",
1378 .data = &sysctl_lowmem_reserve_ratio,
1379 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1380 .mode = 0644,
6d456111 1381 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1382 },
9d0243bc 1383 {
9d0243bc
AM		 1384 .procname = "drop_caches",
1385 .data = &sysctl_drop_caches,
1386 .maxlen = sizeof(int),
1387 .mode = 0644,
1388 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1389 .extra1 = &one,
5509a5d2 1390 .extra2 = &four,
9d0243bc 1391 },
76ab0f53
MG		 1392#ifdef CONFIG_COMPACTION
1393 {
1394 .procname = "compact_memory",
1395 .data = &sysctl_compact_memory,
1396 .maxlen = sizeof(int),
1397 .mode = 0200,
1398 .proc_handler = sysctl_compaction_handler,
1399 },
5e771905
MG		 1400 {
1401 .procname = "extfrag_threshold",
1402 .data = &sysctl_extfrag_threshold,
1403 .maxlen = sizeof(int),
1404 .mode = 0644,
1405 .proc_handler = sysctl_extfrag_handler,
1406 .extra1 = &min_extfrag_threshold,
1407 .extra2 = &max_extfrag_threshold,
1408 },
5bbe3547
EM		 1409 {
1410 .procname = "compact_unevictable_allowed",
1411 .data = &sysctl_compact_unevictable_allowed,
1412 .maxlen = sizeof(int),
1413 .mode = 0644,
1414 .proc_handler = proc_dointvec,
1415 .extra1 = &zero,
1416 .extra2 = &one,
1417 },
5e771905 1418
76ab0f53 1419#endif /* CONFIG_COMPACTION */
1da177e4 1420 {
1da177e4
LT		 1421 .procname = "min_free_kbytes",
1422 .data = &min_free_kbytes,
1423 .maxlen = sizeof(min_free_kbytes),
1424 .mode = 0644,
6d456111 1425 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1426 .extra1 = &zero,
1427 },
795ae7a0
JW		 1428 {
1429 .procname = "watermark_scale_factor",
1430 .data = &watermark_scale_factor,
1431 .maxlen = sizeof(watermark_scale_factor),
1432 .mode = 0644,
1433 .proc_handler = watermark_scale_factor_sysctl_handler,
1434 .extra1 = &one,
1435 .extra2 = &one_thousand,
1436 },
8ad4b1fb 1437 {
8ad4b1fb
RS		 1438 .procname = "percpu_pagelist_fraction",
1439 .data = &percpu_pagelist_fraction,
1440 .maxlen = sizeof(percpu_pagelist_fraction),
1441 .mode = 0644,
6d456111 1442 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1443 .extra1 = &zero,
8ad4b1fb 1444 },
1da177e4
LT		 1445#ifdef CONFIG_MMU
1446 {
1da177e4
LT		 1447 .procname = "max_map_count",
1448 .data = &sysctl_max_map_count,
1449 .maxlen = sizeof(sysctl_max_map_count),
1450 .mode = 0644,
3e26120c 1451 .proc_handler = proc_dointvec_minmax,
70da2340 1452 .extra1 = &zero,
1da177e4 1453 },
dd8632a1
PM		 1454#else
1455 {
dd8632a1
PM		 1456 .procname = "nr_trim_pages",
1457 .data = &sysctl_nr_trim_pages,
1458 .maxlen = sizeof(sysctl_nr_trim_pages),
1459 .mode = 0644,
6d456111 1460 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1461 .extra1 = &zero,
1462 },
1da177e4
LT		 1463#endif
1464 {
1da177e4
LT		 1465 .procname = "laptop_mode",
1466 .data = &laptop_mode,
1467 .maxlen = sizeof(laptop_mode),
1468 .mode = 0644,
6d456111 1469 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1470 },
1471 {
1da177e4
LT		 1472 .procname = "block_dump",
1473 .data = &block_dump,
1474 .maxlen = sizeof(block_dump),
1475 .mode = 0644,
6d456111 1476 .proc_handler = proc_dointvec,
1da177e4
LT		 1477 .extra1 = &zero,
1478 },
1479 {
1da177e4
LT		 1480 .procname = "vfs_cache_pressure",
1481 .data = &sysctl_vfs_cache_pressure,
1482 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1483 .mode = 0644,
6d456111 1484 .proc_handler = proc_dointvec,
1da177e4
LT		 1485 .extra1 = &zero,
1486 },
1487#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1488 {
1da177e4
LT		 1489 .procname = "legacy_va_layout",
1490 .data = &sysctl_legacy_va_layout,
1491 .maxlen = sizeof(sysctl_legacy_va_layout),
1492 .mode = 0644,
6d456111 1493 .proc_handler = proc_dointvec,
1da177e4
LT		 1494 .extra1 = &zero,
1495 },
1496#endif
1743660b
CL		 1497#ifdef CONFIG_NUMA
1498 {
1743660b
CL		 1499 .procname = "zone_reclaim_mode",
1500 .data = &zone_reclaim_mode,
1501 .maxlen = sizeof(zone_reclaim_mode),
1502 .mode = 0644,
6d456111 1503 .proc_handler = proc_dointvec,
c84db23c 1504 .extra1 = &zero,
1743660b 1505 },
9614634f 1506 {
9614634f
CL		 1507 .procname = "min_unmapped_ratio",
1508 .data = &sysctl_min_unmapped_ratio,
1509 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1510 .mode = 0644,
6d456111 1511 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1512 .extra1 = &zero,
1513 .extra2 = &one_hundred,
1514 },
0ff38490 1515 {
0ff38490
CL		 1516 .procname = "min_slab_ratio",
1517 .data = &sysctl_min_slab_ratio,
1518 .maxlen = sizeof(sysctl_min_slab_ratio),
1519 .mode = 0644,
6d456111 1520 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1521 .extra1 = &zero,
1522 .extra2 = &one_hundred,
1523 },
e6e5494c 1524#endif
77461ab3
CL		 1525#ifdef CONFIG_SMP
1526 {
77461ab3
CL		 1527 .procname = "stat_interval",
1528 .data = &sysctl_stat_interval,
1529 .maxlen = sizeof(sysctl_stat_interval),
1530 .mode = 0644,
6d456111 1531 .proc_handler = proc_dointvec_jiffies,
77461ab3 1532 },
52b6f46b
HD		 1533 {
1534 .procname = "stat_refresh",
1535 .data = NULL,
1536 .maxlen = 0,
1537 .mode = 0600,
1538 .proc_handler = vmstat_refresh,
1539 },
77461ab3 1540#endif
6e141546 1541#ifdef CONFIG_MMU
ed032189 1542 {
ed032189 1543 .procname = "mmap_min_addr",
788084ab
EP		 1544 .data = &dac_mmap_min_addr,
1545 .maxlen = sizeof(unsigned long),
ed032189 1546 .mode = 0644,
6d456111 1547 .proc_handler = mmap_min_addr_handler,
ed032189 1548 },
6e141546 1549#endif
f0c0b2b8
KH		 1550#ifdef CONFIG_NUMA
1551 {
f0c0b2b8
KH		 1552 .procname = "numa_zonelist_order",
1553 .data = &numa_zonelist_order,
1554 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1555 .mode = 0644,
6d456111 1556 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1557 },
1558#endif
2b8232ce 1559#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1560 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1561 {
e6e5494c 1562 .procname = "vdso_enabled",
3d7ee969
AL		 1563#ifdef CONFIG_X86_32
1564 .data = &vdso32_enabled,
1565 .maxlen = sizeof(vdso32_enabled),
1566#else
e6e5494c
IM		 1567 .data = &vdso_enabled,
1568 .maxlen = sizeof(vdso_enabled),
3d7ee969 1569#endif
e6e5494c 1570 .mode = 0644,
6d456111 1571 .proc_handler = proc_dointvec,
e6e5494c
IM		 1572 .extra1 = &zero,
1573 },
1da177e4 1574#endif
195cf453
BG		 1575#ifdef CONFIG_HIGHMEM
1576 {
195cf453
BG		 1577 .procname = "highmem_is_dirtyable",
1578 .data = &vm_highmem_is_dirtyable,
1579 .maxlen = sizeof(vm_highmem_is_dirtyable),
1580 .mode = 0644,
6d456111 1581 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1582 .extra1 = &zero,
1583 .extra2 = &one,
1584 },
1585#endif
6a46079c
AK		 1586#ifdef CONFIG_MEMORY_FAILURE
1587 {
6a46079c
AK		 1588 .procname = "memory_failure_early_kill",
1589 .data = &sysctl_memory_failure_early_kill,
1590 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1591 .mode = 0644,
6d456111 1592 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1593 .extra1 = &zero,
1594 .extra2 = &one,
1595 },
1596 {
6a46079c
AK		 1597 .procname = "memory_failure_recovery",
1598 .data = &sysctl_memory_failure_recovery,
1599 .maxlen = sizeof(sysctl_memory_failure_recovery),
1600 .mode = 0644,
6d456111 1601 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1602 .extra1 = &zero,
1603 .extra2 = &one,
1604 },
1605#endif
c9b1d098
AS		 1606 {
1607 .procname = "user_reserve_kbytes",
1608 .data = &sysctl_user_reserve_kbytes,
1609 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1610 .mode = 0644,
1611 .proc_handler = proc_doulongvec_minmax,
1612 },
4eeab4f5
AS		 1613 {
1614 .procname = "admin_reserve_kbytes",
1615 .data = &sysctl_admin_reserve_kbytes,
1616 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1617 .mode = 0644,
1618 .proc_handler = proc_doulongvec_minmax,
1619 },
d07e2259
DC		 1620#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1621 {
1622 .procname = "mmap_rnd_bits",
1623 .data = &mmap_rnd_bits,
1624 .maxlen = sizeof(mmap_rnd_bits),
1625 .mode = 0600,
1626 .proc_handler = proc_dointvec_minmax,
1627 .extra1 = (void *)&mmap_rnd_bits_min,
1628 .extra2 = (void *)&mmap_rnd_bits_max,
1629 },
1630#endif
1631#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1632 {
1633 .procname = "mmap_rnd_compat_bits",
1634 .data = &mmap_rnd_compat_bits,
1635 .maxlen = sizeof(mmap_rnd_compat_bits),
1636 .mode = 0600,
1637 .proc_handler = proc_dointvec_minmax,
1638 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1639 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1640 },
1641#endif
6fce56ec 1642 { }
1da177e4
LT		 1643};
1644
d8217f07 1645static struct ctl_table fs_table[] = {
1da177e4 1646 {
1da177e4
LT		 1647 .procname = "inode-nr",
1648 .data = &inodes_stat,
3942c07c 1649 .maxlen = 2*sizeof(long),
1da177e4 1650 .mode = 0444,
cffbc8aa 1651 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1652 },
1653 {
1da177e4
LT		 1654 .procname = "inode-state",
1655 .data = &inodes_stat,
3942c07c 1656 .maxlen = 7*sizeof(long),
1da177e4 1657 .mode = 0444,
cffbc8aa 1658 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1659 },
1660 {
1da177e4
LT		 1661 .procname = "file-nr",
1662 .data = &files_stat,
518de9b3 1663 .maxlen = sizeof(files_stat),
1da177e4 1664 .mode = 0444,
6d456111 1665 .proc_handler = proc_nr_files,
1da177e4
LT		 1666 },
1667 {
1da177e4
LT		 1668 .procname = "file-max",
1669 .data = &files_stat.max_files,
518de9b3 1670 .maxlen = sizeof(files_stat.max_files),
1da177e4 1671 .mode = 0644,
518de9b3 1672 .proc_handler = proc_doulongvec_minmax,
1da177e4 1673 },
9cfe015a 1674 {
9cfe015a
ED		 1675 .procname = "nr_open",
1676 .data = &sysctl_nr_open,
1677 .maxlen = sizeof(int),
1678 .mode = 0644,
6d456111 1679 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1680 .extra1 = &sysctl_nr_open_min,
1681 .extra2 = &sysctl_nr_open_max,
9cfe015a 1682 },
1da177e4 1683 {
1da177e4
LT		 1684 .procname = "dentry-state",
1685 .data = &dentry_stat,
3942c07c 1686 .maxlen = 6*sizeof(long),
1da177e4 1687 .mode = 0444,
312d3ca8 1688 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1689 },
1690 {
1da177e4
LT		 1691 .procname = "overflowuid",
1692 .data = &fs_overflowuid,
1693 .maxlen = sizeof(int),
1694 .mode = 0644,
6d456111 1695 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1696 .extra1 = &minolduid,
1697 .extra2 = &maxolduid,
1698 },
1699 {
1da177e4
LT		 1700 .procname = "overflowgid",
1701 .data = &fs_overflowgid,
1702 .maxlen = sizeof(int),
1703 .mode = 0644,
6d456111 1704 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1705 .extra1 = &minolduid,
1706 .extra2 = &maxolduid,
1707 },
bfcd17a6 1708#ifdef CONFIG_FILE_LOCKING
1da177e4 1709 {
1da177e4
LT		 1710 .procname = "leases-enable",
1711 .data = &leases_enable,
1712 .maxlen = sizeof(int),
1713 .mode = 0644,
6d456111 1714 .proc_handler = proc_dointvec,
1da177e4 1715 },
bfcd17a6 1716#endif
1da177e4
LT		 1717#ifdef CONFIG_DNOTIFY
1718 {
1da177e4
LT		 1719 .procname = "dir-notify-enable",
1720 .data = &dir_notify_enable,
1721 .maxlen = sizeof(int),
1722 .mode = 0644,
6d456111 1723 .proc_handler = proc_dointvec,
1da177e4
LT		 1724 },
1725#endif
1726#ifdef CONFIG_MMU
bfcd17a6 1727#ifdef CONFIG_FILE_LOCKING
1da177e4 1728 {
1da177e4
LT		 1729 .procname = "lease-break-time",
1730 .data = &lease_break_time,
1731 .maxlen = sizeof(int),
1732 .mode = 0644,
6d456111 1733 .proc_handler = proc_dointvec,
1da177e4 1734 },
bfcd17a6 1735#endif
ebf3f09c 1736#ifdef CONFIG_AIO
1da177e4 1737 {
1da177e4
LT		 1738 .procname = "aio-nr",
1739 .data = &aio_nr,
1740 .maxlen = sizeof(aio_nr),
1741 .mode = 0444,
6d456111 1742 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1743 },
1744 {
1da177e4
LT		 1745 .procname = "aio-max-nr",
1746 .data = &aio_max_nr,
1747 .maxlen = sizeof(aio_max_nr),
1748 .mode = 0644,
6d456111 1749 .proc_handler = proc_doulongvec_minmax,
1da177e4 1750 },
ebf3f09c 1751#endif /* CONFIG_AIO */
2d9048e2 1752#ifdef CONFIG_INOTIFY_USER
0399cb08 1753 {
0399cb08
RL		 1754 .procname = "inotify",
1755 .mode = 0555,
1756 .child = inotify_table,
1757 },
1758#endif
7ef9964e
DL		 1759#ifdef CONFIG_EPOLL
1760 {
1761 .procname = "epoll",
1762 .mode = 0555,
1763 .child = epoll_table,
1764 },
1765#endif
1da177e4 1766#endif
800179c9
KC		 1767 {
1768 .procname = "protected_symlinks",
1769 .data = &sysctl_protected_symlinks,
1770 .maxlen = sizeof(int),
1771 .mode = 0600,
1772 .proc_handler = proc_dointvec_minmax,
1773 .extra1 = &zero,
1774 .extra2 = &one,
1775 },
1776 {
1777 .procname = "protected_hardlinks",
1778 .data = &sysctl_protected_hardlinks,
1779 .maxlen = sizeof(int),
1780 .mode = 0600,
1781 .proc_handler = proc_dointvec_minmax,
1782 .extra1 = &zero,
1783 .extra2 = &one,
1784 },
d6e71144 1785 {
d6e71144
AC		 1786 .procname = "suid_dumpable",
1787 .data = &suid_dumpable,
1788 .maxlen = sizeof(int),
1789 .mode = 0644,
54b50199 1790 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1791 .extra1 = &zero,
1792 .extra2 = &two,
d6e71144 1793 },
2abc26fc
EB		 1794#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1795 {
2abc26fc
EB		 1796 .procname = "binfmt_misc",
1797 .mode = 0555,
f9bd6733 1798 .child = sysctl_mount_point,
2abc26fc
EB		 1799 },
1800#endif
b492e95b 1801 {
ff9da691
JA		 1802 .procname = "pipe-max-size",
1803 .data = &pipe_max_size,
b492e95b
JA		 1804 .maxlen = sizeof(int),
1805 .mode = 0644,
ff9da691
JA		 1806 .proc_handler = &pipe_proc_fn,
1807 .extra1 = &pipe_min_size,
b492e95b 1808 },
759c0114
WT		 1809 {
1810 .procname = "pipe-user-pages-hard",
1811 .data = &pipe_user_pages_hard,
1812 .maxlen = sizeof(pipe_user_pages_hard),
1813 .mode = 0644,
1814 .proc_handler = proc_doulongvec_minmax,
1815 },
1816 {
1817 .procname = "pipe-user-pages-soft",
1818 .data = &pipe_user_pages_soft,
1819 .maxlen = sizeof(pipe_user_pages_soft),
1820 .mode = 0644,
1821 .proc_handler = proc_doulongvec_minmax,
1822 },
6fce56ec 1823 { }
1da177e4
LT		 1824};
1825
d8217f07 1826static struct ctl_table debug_table[] = {
7ac57a89 1827#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1828 {
abd4f750
MAS		 1829 .procname = "exception-trace",
1830 .data = &show_unhandled_signals,
1831 .maxlen = sizeof(int),
1832 .mode = 0644,
1833 .proc_handler = proc_dointvec
1834 },
b2be84df
MH		 1835#endif
1836#if defined(CONFIG_OPTPROBES)
1837 {
1838 .procname = "kprobes-optimization",
1839 .data = &sysctl_kprobes_optimization,
1840 .maxlen = sizeof(int),
1841 .mode = 0644,
1842 .proc_handler = proc_kprobes_optimization_handler,
1843 .extra1 = &zero,
1844 .extra2 = &one,
1845 },
abd4f750 1846#endif
6fce56ec 1847 { }
1da177e4
LT		 1848};
1849
d8217f07 1850static struct ctl_table dev_table[] = {
6fce56ec 1851 { }
0eeca283 1852};
1da177e4 1853
de4e83bd 1854int __init sysctl_init(void)
d912b0cc 1855{
fd4b616b
SR		 1856 struct ctl_table_header *hdr;
1857
1858 hdr = register_sysctl_table(sysctl_base_table);
1859 kmemleak_not_leak(hdr);
d912b0cc
EB		 1860 return 0;
1861}
1862
b89a8171
EB		 1863#endif /* CONFIG_SYSCTL */
1864
1da177e4
LT		 1865/*
1866 * /proc/sys support
1867 */
1868
b89a8171 1869#ifdef CONFIG_PROC_SYSCTL
1da177e4 1870
f8808300
KC		 1871static int _proc_do_string(char *data, int maxlen, int write,
1872 char __user *buffer,
b1ba4ddd 1873 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1874{
1875 size_t len;
1876 char __user *p;
1877 char c;
8d060877
ON		 1878
1879 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1880 *lenp = 0;
1881 return 0;
1882 }
8d060877 1883
1da177e4 1884 if (write) {
f4aacea2
KC		 1885 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1886 /* Only continue writes not past the end of buffer. */
1887 len = strlen(data);
1888 if (len > maxlen - 1)
1889 len = maxlen - 1;
1890
1891 if (*ppos > len)
1892 return 0;
1893 len = *ppos;
1894 } else {
1895 /* Start writing from beginning of buffer. */
1896 len = 0;
1897 }
1898
2ca9bb45 1899 *ppos += *lenp;
1da177e4 1900 p = buffer;
2ca9bb45 1901 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1902 if (get_user(c, p++))
1903 return -EFAULT;
1904 if (c == 0 || c == '\n')
1905 break;
2ca9bb45 1906 data[len++] = c;
1da177e4 1907 }
f8808300 1908 data[len] = 0;
1da177e4 1909 } else {
f5dd3d6f
SV		 1910 len = strlen(data);
1911 if (len > maxlen)
1912 len = maxlen;
8d060877
ON		 1913
1914 if (*ppos > len) {
1915 *lenp = 0;
1916 return 0;
1917 }
1918
1919 data += *ppos;
1920 len -= *ppos;
1921
1da177e4
LT		 1922 if (len > *lenp)
1923 len = *lenp;
1924 if (len)
f8808300 1925 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1926 return -EFAULT;
1927 if (len < *lenp) {
f8808300 1928 if (put_user('\n', buffer + len))
1da177e4
LT		 1929 return -EFAULT;
1930 len++;
1931 }
1932 *lenp = len;
1933 *ppos += len;
1934 }
1935 return 0;
1936}
1937
f4aacea2
KC		 1938static void warn_sysctl_write(struct ctl_table *table)
1939{
1940 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1941 "This will not be supported in the future. To silence this\n"
1942 "warning, set kernel.sysctl_writes_strict = -1\n",
1943 current->comm, table->procname);
1944}
1945
f5dd3d6f
SV		 1946/**
1947 * proc_dostring - read a string sysctl
1948 * @table: the sysctl table
1949 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 1950 * @buffer: the user buffer
1951 * @lenp: the size of the user buffer
1952 * @ppos: file position
1953 *
1954 * Reads/writes a string from/to the user buffer. If the kernel
1955 * buffer provided is not large enough to hold the string, the
1956 * string is truncated. The copied string is %NULL-terminated.
1957 * If the string is being read by the user process, it is copied
1958 * and a newline '\n' is added. It is truncated if the buffer is
1959 * not large enough.
1960 *
1961 * Returns 0 on success.
1962 */
8d65af78 1963int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 1964 void __user *buffer, size_t *lenp, loff_t *ppos)
1965{
f4aacea2
KC		 1966 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1967 warn_sysctl_write(table);
1968
f8808300
KC		 1969 return _proc_do_string((char *)(table->data), table->maxlen, write,
1970 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 1971}
1972
00b7c339
AW		 1973static size_t proc_skip_spaces(char **buf)
1974{
1975 size_t ret;
1976 char *tmp = skip_spaces(*buf);
1977 ret = tmp - *buf;
1978 *buf = tmp;
1979 return ret;
1980}
1981
9f977fb7
OP		 1982static void proc_skip_char(char **buf, size_t *size, const char v)
1983{
1984 while (*size) {
1985 if (**buf != v)
1986 break;
1987 (*size)--;
1988 (*buf)++;
1989 }
1990}
1991
00b7c339
AW		 1992#define TMPBUFLEN 22
1993/**
0fc377bd 1994 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 1995 *
0fc377bd
RD		 1996 * @buf: a kernel buffer
1997 * @size: size of the kernel buffer
1998 * @val: this is where the number will be stored
1999 * @neg: set to %TRUE if number is negative
2000 * @perm_tr: a vector which contains the allowed trailers
2001 * @perm_tr_len: size of the perm_tr vector
2002 * @tr: pointer to store the trailer character
00b7c339 2003 *
0fc377bd
RD		 2004 * In case of success %0 is returned and @buf and @size are updated with
2005 * the amount of bytes read. If @tr is non-NULL and a trailing
2006 * character exists (size is non-zero after returning from this
2007 * function), @tr is updated with the trailing character.
00b7c339
AW		 2008 */
2009static int proc_get_long(char **buf, size_t *size,
2010 unsigned long *val, bool *neg,
2011 const char *perm_tr, unsigned perm_tr_len, char *tr)
2012{
2013 int len;
2014 char *p, tmp[TMPBUFLEN];
2015
2016 if (!*size)
2017 return -EINVAL;
2018
2019 len = *size;
2020 if (len > TMPBUFLEN - 1)
2021 len = TMPBUFLEN - 1;
2022
2023 memcpy(tmp, *buf, len);
2024
2025 tmp[len] = 0;
2026 p = tmp;
2027 if (*p == '-' && *size > 1) {
2028 *neg = true;
2029 p++;
2030 } else
2031 *neg = false;
2032 if (!isdigit(*p))
2033 return -EINVAL;
2034
2035 *val = simple_strtoul(p, &p, 0);
2036
2037 len = p - tmp;
2038
2039 /* We don't know if the next char is whitespace thus we may accept
2040 * invalid integers (e.g. 1234...a) or two integers instead of one
2041 * (e.g. 123...1). So lets not allow such large numbers. */
2042 if (len == TMPBUFLEN - 1)
2043 return -EINVAL;
2044
2045 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2046 return -EINVAL;
1da177e4 2047
00b7c339
AW		 2048 if (tr && (len < *size))
2049 *tr = *p;
2050
2051 *buf += len;
2052 *size -= len;
2053
2054 return 0;
2055}
2056
2057/**
0fc377bd 2058 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2059 *
0fc377bd
RD		 2060 * @buf: the user buffer
2061 * @size: the size of the user buffer
2062 * @val: the integer to be converted
2063 * @neg: sign of the number, %TRUE for negative
00b7c339 2064 *
0fc377bd
RD		 2065 * In case of success %0 is returned and @buf and @size are updated with
2066 * the amount of bytes written.
00b7c339
AW		 2067 */
2068static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2069 bool neg)
2070{
2071 int len;
2072 char tmp[TMPBUFLEN], *p = tmp;
2073
2074 sprintf(p, "%s%lu", neg ? "-" : "", val);
2075 len = strlen(tmp);
2076 if (len > *size)
2077 len = *size;
2078 if (copy_to_user(*buf, tmp, len))
2079 return -EFAULT;
2080 *size -= len;
2081 *buf += len;
2082 return 0;
2083}
2084#undef TMPBUFLEN
2085
2086static int proc_put_char(void __user **buf, size_t *size, char c)
2087{
2088 if (*size) {
2089 char __user **buffer = (char __user **)buf;
2090 if (put_user(c, *buffer))
2091 return -EFAULT;
2092 (*size)--, (*buffer)++;
2093 *buf = *buffer;
2094 }
2095 return 0;
2096}
1da177e4 2097
00b7c339 2098static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2099 int *valp,
2100 int write, void *data)
2101{
2102 if (write) {
230633d1
HS		 2103 if (*negp) {
2104 if (*lvalp > (unsigned long) INT_MAX + 1)
2105 return -EINVAL;
2106 *valp = -*lvalp;
2107 } else {
2108 if (*lvalp > (unsigned long) INT_MAX)
2109 return -EINVAL;
2110 *valp = *lvalp;
2111 }
1da177e4
LT		 2112 } else {
2113 int val = *valp;
2114 if (val < 0) {
00b7c339 2115 *negp = true;
9a5bc726 2116 *lvalp = -(unsigned long)val;
1da177e4 2117 } else {
00b7c339 2118 *negp = false;
1da177e4
LT		 2119 *lvalp = (unsigned long)val;
2120 }
2121 }
2122 return 0;
2123}
2124
00b7c339
AW		 2125static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2126
d8217f07 2127static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2128 int write, void __user *buffer,
fcfbd547 2129 size_t *lenp, loff_t *ppos,
00b7c339 2130 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2131 int write, void *data),
2132 void *data)
2133{
00b7c339 2134 int *i, vleft, first = 1, err = 0;
00b7c339 2135 size_t left;
70f6cbb6 2136 char *kbuf = NULL, *p;
1da177e4 2137
00b7c339 2138 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2139 *lenp = 0;
2140 return 0;
2141 }
2142
fcfbd547 2143 i = (int *) tbl_data;
1da177e4
LT		 2144 vleft = table->maxlen / sizeof(*i);
2145 left = *lenp;
2146
2147 if (!conv)
2148 conv = do_proc_dointvec_conv;
2149
00b7c339 2150 if (write) {
f4aacea2
KC		 2151 if (*ppos) {
2152 switch (sysctl_writes_strict) {
2153 case SYSCTL_WRITES_STRICT:
2154 goto out;
2155 case SYSCTL_WRITES_WARN:
2156 warn_sysctl_write(table);
2157 break;
2158 default:
2159 break;
2160 }
2161 }
2162
00b7c339
AW		 2163 if (left > PAGE_SIZE - 1)
2164 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2165 p = kbuf = memdup_user_nul(buffer, left);
2166 if (IS_ERR(kbuf))
2167 return PTR_ERR(kbuf);
00b7c339
AW		 2168 }
2169
1da177e4 2170 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2171 unsigned long lval;
2172 bool neg;
1da177e4 2173
00b7c339 2174 if (write) {
70f6cbb6 2175 left -= proc_skip_spaces(&p);
1da177e4 2176
563b0467
O		 2177 if (!left)
2178 break;
70f6cbb6 2179 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2180 proc_wspace_sep,
2181 sizeof(proc_wspace_sep), NULL);
2182 if (err)
1da177e4 2183 break;
00b7c339
AW		 2184 if (conv(&neg, &lval, i, 1, data)) {
2185 err = -EINVAL;
1da177e4 2186 break;
00b7c339 2187 }
1da177e4 2188 } else {
00b7c339
AW		 2189 if (conv(&neg, &lval, i, 0, data)) {
2190 err = -EINVAL;
2191 break;
2192 }
1da177e4 2193 if (!first)
00b7c339
AW		 2194 err = proc_put_char(&buffer, &left, '\t');
2195 if (err)
2196 break;
2197 err = proc_put_long(&buffer, &left, lval, neg);
2198 if (err)
1da177e4 2199 break;
1da177e4
LT		 2200 }
2201 }
2202
00b7c339
AW		 2203 if (!write && !first && left && !err)
2204 err = proc_put_char(&buffer, &left, '\n');
563b0467 2205 if (write && !err && left)
70f6cbb6 2206 left -= proc_skip_spaces(&p);
1da177e4 2207 if (write) {
70f6cbb6 2208 kfree(kbuf);
00b7c339
AW		 2209 if (first)
2210 return err ? : -EINVAL;
1da177e4 2211 }
1da177e4 2212 *lenp -= left;
f4aacea2 2213out:
1da177e4 2214 *ppos += *lenp;
00b7c339 2215 return err;
1da177e4
LT		 2216}
2217
8d65af78 2218static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2219 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2220 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2221 int write, void *data),
2222 void *data)
2223{
8d65af78 2224 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2225 buffer, lenp, ppos, conv, data);
2226}
2227
1da177e4
LT		 2228/**
2229 * proc_dointvec - read a vector of integers
2230 * @table: the sysctl table
2231 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2232 * @buffer: the user buffer
2233 * @lenp: the size of the user buffer
2234 * @ppos: file position
2235 *
2236 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2237 * values from/to the user buffer, treated as an ASCII string.
2238 *
2239 * Returns 0 on success.
2240 */
8d65af78 2241int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2242 void __user *buffer, size_t *lenp, loff_t *ppos)
2243{
8d65af78 2244 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2245 NULL,NULL);
2246}
2247
34f5a398 2248/*
25ddbb18
AK		 2249 * Taint values can only be increased
2250 * This means we can safely use a temporary.
34f5a398 2251 */
8d65af78 2252static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2253 void __user *buffer, size_t *lenp, loff_t *ppos)
2254{
25ddbb18
AK		 2255 struct ctl_table t;
2256 unsigned long tmptaint = get_taint();
2257 int err;
34f5a398 2258
91fcd412 2259 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2260 return -EPERM;
2261
25ddbb18
AK		 2262 t = *table;
2263 t.data = &tmptaint;
8d65af78 2264 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2265 if (err < 0)
2266 return err;
2267
2268 if (write) {
2269 /*
2270 * Poor man's atomic or. Not worth adding a primitive
2271 * to everyone's atomic.h for this
2272 */
2273 int i;
2274 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2275 if ((tmptaint >> i) & 1)
373d4d09 2276 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2277 }
2278 }
2279
2280 return err;
34f5a398
TT		 2281}
2282
bfdc0b49 2283#ifdef CONFIG_PRINTK
620f6e8e 2284static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2285 void __user *buffer, size_t *lenp, loff_t *ppos)
2286{
2287 if (write && !capable(CAP_SYS_ADMIN))
2288 return -EPERM;
2289
2290 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2291}
2292#endif
2293
1da177e4
LT		 2294struct do_proc_dointvec_minmax_conv_param {
2295 int *min;
2296 int *max;
2297};
2298
00b7c339
AW		 2299static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2300 int *valp,
1da177e4
LT		 2301 int write, void *data)
2302{
2303 struct do_proc_dointvec_minmax_conv_param *param = data;
2304 if (write) {
2305 int val = *negp ? -*lvalp : *lvalp;
2306 if ((param->min && *param->min > val) ||
2307 (param->max && *param->max < val))
2308 return -EINVAL;
2309 *valp = val;
2310 } else {
2311 int val = *valp;
2312 if (val < 0) {
00b7c339 2313 *negp = true;
9a5bc726 2314 *lvalp = -(unsigned long)val;
1da177e4 2315 } else {
00b7c339 2316 *negp = false;
1da177e4
LT		 2317 *lvalp = (unsigned long)val;
2318 }
2319 }
2320 return 0;
2321}
2322
2323/**
2324 * proc_dointvec_minmax - read a vector of integers with min/max values
2325 * @table: the sysctl table
2326 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2327 * @buffer: the user buffer
2328 * @lenp: the size of the user buffer
2329 * @ppos: file position
2330 *
2331 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2332 * values from/to the user buffer, treated as an ASCII string.
2333 *
2334 * This routine will ensure the values are within the range specified by
2335 * table->extra1 (min) and table->extra2 (max).
2336 *
2337 * Returns 0 on success.
2338 */
8d65af78 2339int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2340 void __user *buffer, size_t *lenp, loff_t *ppos)
2341{
2342 struct do_proc_dointvec_minmax_conv_param param = {
2343 .min = (int *) table->extra1,
2344 .max = (int *) table->extra2,
2345 };
8d65af78 2346 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2347 do_proc_dointvec_minmax_conv, &param);
2348}
2349
54b50199
KC		 2350static void validate_coredump_safety(void)
2351{
046d662f 2352#ifdef CONFIG_COREDUMP
e579d2c2 2353 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199
KC		 2354 core_pattern[0] != '/' && core_pattern[0] != '|') {
2355 printk(KERN_WARNING "Unsafe core_pattern used with "\
2356 "suid_dumpable=2. Pipe handler or fully qualified "\
2357 "core dump path required.\n");
2358 }
046d662f 2359#endif
54b50199
KC		 2360}
2361
2362static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2363 void __user *buffer, size_t *lenp, loff_t *ppos)
2364{
2365 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2366 if (!error)
2367 validate_coredump_safety();
2368 return error;
2369}
2370
046d662f 2371#ifdef CONFIG_COREDUMP
54b50199
KC		 2372static int proc_dostring_coredump(struct ctl_table *table, int write,
2373 void __user *buffer, size_t *lenp, loff_t *ppos)
2374{
2375 int error = proc_dostring(table, write, buffer, lenp, ppos);
2376 if (!error)
2377 validate_coredump_safety();
2378 return error;
2379}
046d662f 2380#endif
54b50199 2381
d8217f07 2382static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2383 void __user *buffer,
2384 size_t *lenp, loff_t *ppos,
2385 unsigned long convmul,
2386 unsigned long convdiv)
2387{
00b7c339
AW		 2388 unsigned long *i, *min, *max;
2389 int vleft, first = 1, err = 0;
00b7c339 2390 size_t left;
70f6cbb6 2391 char *kbuf = NULL, *p;
00b7c339
AW		 2392
2393 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2394 *lenp = 0;
2395 return 0;
2396 }
00b7c339 2397
fcfbd547 2398 i = (unsigned long *) data;
1da177e4
LT		 2399 min = (unsigned long *) table->extra1;
2400 max = (unsigned long *) table->extra2;
2401 vleft = table->maxlen / sizeof(unsigned long);
2402 left = *lenp;
00b7c339
AW		 2403
2404 if (write) {
f4aacea2
KC		 2405 if (*ppos) {
2406 switch (sysctl_writes_strict) {
2407 case SYSCTL_WRITES_STRICT:
2408 goto out;
2409 case SYSCTL_WRITES_WARN:
2410 warn_sysctl_write(table);
2411 break;
2412 default:
2413 break;
2414 }
2415 }
2416
00b7c339
AW		 2417 if (left > PAGE_SIZE - 1)
2418 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2419 p = kbuf = memdup_user_nul(buffer, left);
2420 if (IS_ERR(kbuf))
2421 return PTR_ERR(kbuf);
00b7c339
AW		 2422 }
2423
27b3d80a 2424 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2425 unsigned long val;
2426
1da177e4 2427 if (write) {
00b7c339
AW		 2428 bool neg;
2429
70f6cbb6 2430 left -= proc_skip_spaces(&p);
00b7c339 2431
70f6cbb6 2432 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2433 proc_wspace_sep,
2434 sizeof(proc_wspace_sep), NULL);
2435 if (err)
1da177e4
LT		 2436 break;
2437 if (neg)
1da177e4
LT		 2438 continue;
2439 if ((min && val < *min) || (max && val > *max))
2440 continue;
2441 *i = val;
2442 } else {
00b7c339 2443 val = convdiv * (*i) / convmul;
7833819d 2444 if (!first) {
00b7c339 2445 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2446 if (err)
2447 break;
2448 }
00b7c339
AW		 2449 err = proc_put_long(&buffer, &left, val, false);
2450 if (err)
2451 break;
1da177e4
LT		 2452 }
2453 }
2454
00b7c339
AW		 2455 if (!write && !first && left && !err)
2456 err = proc_put_char(&buffer, &left, '\n');
2457 if (write && !err)
70f6cbb6 2458 left -= proc_skip_spaces(&p);
1da177e4 2459 if (write) {
70f6cbb6 2460 kfree(kbuf);
00b7c339
AW		 2461 if (first)
2462 return err ? : -EINVAL;
1da177e4 2463 }
1da177e4 2464 *lenp -= left;
f4aacea2 2465out:
1da177e4 2466 *ppos += *lenp;
00b7c339 2467 return err;
1da177e4
LT		 2468}
2469
d8217f07 2470static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2471 void __user *buffer,
2472 size_t *lenp, loff_t *ppos,
2473 unsigned long convmul,
2474 unsigned long convdiv)
2475{
2476 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2477 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2478}
2479
1da177e4
LT		 2480/**
2481 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2482 * @table: the sysctl table
2483 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2484 * @buffer: the user buffer
2485 * @lenp: the size of the user buffer
2486 * @ppos: file position
2487 *
2488 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2489 * values from/to the user buffer, treated as an ASCII string.
2490 *
2491 * This routine will ensure the values are within the range specified by
2492 * table->extra1 (min) and table->extra2 (max).
2493 *
2494 * Returns 0 on success.
2495 */
8d65af78 2496int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2497 void __user *buffer, size_t *lenp, loff_t *ppos)
2498{
8d65af78 2499 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2500}
2501
2502/**
2503 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2504 * @table: the sysctl table
2505 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2506 * @buffer: the user buffer
2507 * @lenp: the size of the user buffer
2508 * @ppos: file position
2509 *
2510 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2511 * values from/to the user buffer, treated as an ASCII string. The values
2512 * are treated as milliseconds, and converted to jiffies when they are stored.
2513 *
2514 * This routine will ensure the values are within the range specified by
2515 * table->extra1 (min) and table->extra2 (max).
2516 *
2517 * Returns 0 on success.
2518 */
d8217f07 2519int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2520 void __user *buffer,
2521 size_t *lenp, loff_t *ppos)
2522{
8d65af78 2523 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2524 lenp, ppos, HZ, 1000l);
2525}
2526
2527
00b7c339 2528static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2529 int *valp,
2530 int write, void *data)
2531{
2532 if (write) {
cba9f33d
BS		 2533 if (*lvalp > LONG_MAX / HZ)
2534 return 1;
1da177e4
LT		 2535 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2536 } else {
2537 int val = *valp;
2538 unsigned long lval;
2539 if (val < 0) {
00b7c339 2540 *negp = true;
9a5bc726 2541 lval = -(unsigned long)val;
1da177e4 2542 } else {
00b7c339 2543 *negp = false;
1da177e4
LT		 2544 lval = (unsigned long)val;
2545 }
2546 *lvalp = lval / HZ;
2547 }
2548 return 0;
2549}
2550
00b7c339 2551static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2552 int *valp,
2553 int write, void *data)
2554{
2555 if (write) {
cba9f33d
BS		 2556 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2557 return 1;
1da177e4
LT		 2558 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2559 } else {
2560 int val = *valp;
2561 unsigned long lval;
2562 if (val < 0) {
00b7c339 2563 *negp = true;
9a5bc726 2564 lval = -(unsigned long)val;
1da177e4 2565 } else {
00b7c339 2566 *negp = false;
1da177e4
LT		 2567 lval = (unsigned long)val;
2568 }
2569 *lvalp = jiffies_to_clock_t(lval);
2570 }
2571 return 0;
2572}
2573
00b7c339 2574static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2575 int *valp,
2576 int write, void *data)
2577{
2578 if (write) {
d738ce8f
FF		 2579 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2580
2581 if (jif > INT_MAX)
2582 return 1;
2583 *valp = (int)jif;
1da177e4
LT		 2584 } else {
2585 int val = *valp;
2586 unsigned long lval;
2587 if (val < 0) {
00b7c339 2588 *negp = true;
9a5bc726 2589 lval = -(unsigned long)val;
1da177e4 2590 } else {
00b7c339 2591 *negp = false;
1da177e4
LT		 2592 lval = (unsigned long)val;
2593 }
2594 *lvalp = jiffies_to_msecs(lval);
2595 }
2596 return 0;
2597}
2598
2599/**
2600 * proc_dointvec_jiffies - read a vector of integers as seconds
2601 * @table: the sysctl table
2602 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2603 * @buffer: the user buffer
2604 * @lenp: the size of the user buffer
2605 * @ppos: file position
2606 *
2607 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2608 * values from/to the user buffer, treated as an ASCII string.
2609 * The values read are assumed to be in seconds, and are converted into
2610 * jiffies.
2611 *
2612 * Returns 0 on success.
2613 */
8d65af78 2614int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2615 void __user *buffer, size_t *lenp, loff_t *ppos)
2616{
8d65af78 2617 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2618 do_proc_dointvec_jiffies_conv,NULL);
2619}
2620
2621/**
2622 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2623 * @table: the sysctl table
2624 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2625 * @buffer: the user buffer
2626 * @lenp: the size of the user buffer
1e5d5331 2627 * @ppos: pointer to the file position
1da177e4
LT		 2628 *
2629 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2630 * values from/to the user buffer, treated as an ASCII string.
2631 * The values read are assumed to be in 1/USER_HZ seconds, and
2632 * are converted into jiffies.
2633 *
2634 * Returns 0 on success.
2635 */
8d65af78 2636int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2637 void __user *buffer, size_t *lenp, loff_t *ppos)
2638{
8d65af78 2639 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2640 do_proc_dointvec_userhz_jiffies_conv,NULL);
2641}
2642
2643/**
2644 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2645 * @table: the sysctl table
2646 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2647 * @buffer: the user buffer
2648 * @lenp: the size of the user buffer
67be2dd1
MW		 2649 * @ppos: file position
2650 * @ppos: the current position in the file
1da177e4
LT		 2651 *
2652 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2653 * values from/to the user buffer, treated as an ASCII string.
2654 * The values read are assumed to be in 1/1000 seconds, and
2655 * are converted into jiffies.
2656 *
2657 * Returns 0 on success.
2658 */
8d65af78 2659int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2660 void __user *buffer, size_t *lenp, loff_t *ppos)
2661{
8d65af78 2662 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2663 do_proc_dointvec_ms_jiffies_conv, NULL);
2664}
2665
8d65af78 2666static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2667 void __user *buffer, size_t *lenp, loff_t *ppos)
2668{
2669 struct pid *new_pid;
2670 pid_t tmp;
2671 int r;
2672
6c5f3e7b 2673 tmp = pid_vnr(cad_pid);
9ec52099 2674
8d65af78 2675 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2676 lenp, ppos, NULL, NULL);
2677 if (r || !write)
2678 return r;
2679
2680 new_pid = find_get_pid(tmp);
2681 if (!new_pid)
2682 return -ESRCH;
2683
2684 put_pid(xchg(&cad_pid, new_pid));
2685 return 0;
2686}
2687
9f977fb7
OP		 2688/**
2689 * proc_do_large_bitmap - read/write from/to a large bitmap
2690 * @table: the sysctl table
2691 * @write: %TRUE if this is a write to the sysctl file
2692 * @buffer: the user buffer
2693 * @lenp: the size of the user buffer
2694 * @ppos: file position
2695 *
2696 * The bitmap is stored at table->data and the bitmap length (in bits)
2697 * in table->maxlen.
2698 *
2699 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2700 * large bitmaps may be represented in a compact manner. Writing into
2701 * the file will clear the bitmap then update it with the given input.
2702 *
2703 * Returns 0 on success.
2704 */
2705int proc_do_large_bitmap(struct ctl_table *table, int write,
2706 void __user *buffer, size_t *lenp, loff_t *ppos)
2707{
2708 int err = 0;
2709 bool first = 1;
2710 size_t left = *lenp;
2711 unsigned long bitmap_len = table->maxlen;
122ff243 2712 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2713 unsigned long *tmp_bitmap = NULL;
2714 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2715
122ff243 2716 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2717 *lenp = 0;
2718 return 0;
2719 }
2720
2721 if (write) {
70f6cbb6 2722 char *kbuf, *p;
9f977fb7
OP		 2723
2724 if (left > PAGE_SIZE - 1)
2725 left = PAGE_SIZE - 1;
2726
70f6cbb6
AV		 2727 p = kbuf = memdup_user_nul(buffer, left);
2728 if (IS_ERR(kbuf))
2729 return PTR_ERR(kbuf);
9f977fb7
OP		 2730
2731 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2732 GFP_KERNEL);
2733 if (!tmp_bitmap) {
70f6cbb6 2734 kfree(kbuf);
9f977fb7
OP		 2735 return -ENOMEM;
2736 }
70f6cbb6 2737 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 2738 while (!err && left) {
2739 unsigned long val_a, val_b;
2740 bool neg;
2741
70f6cbb6 2742 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 2743 sizeof(tr_a), &c);
2744 if (err)
2745 break;
2746 if (val_a >= bitmap_len || neg) {
2747 err = -EINVAL;
2748 break;
2749 }
2750
2751 val_b = val_a;
2752 if (left) {
70f6cbb6 2753 p++;
9f977fb7
OP		 2754 left--;
2755 }
2756
2757 if (c == '-') {
70f6cbb6 2758 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 2759 &neg, tr_b, sizeof(tr_b),
2760 &c);
2761 if (err)
2762 break;
2763 if (val_b >= bitmap_len || neg ||
2764 val_a > val_b) {
2765 err = -EINVAL;
2766 break;
2767 }
2768 if (left) {
70f6cbb6 2769 p++;
9f977fb7
OP		 2770 left--;
2771 }
2772 }
2773
5a04cca6 2774 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 2775 first = 0;
70f6cbb6 2776 proc_skip_char(&p, &left, '\n');
9f977fb7 2777 }
70f6cbb6 2778 kfree(kbuf);
9f977fb7
OP		 2779 } else {
2780 unsigned long bit_a, bit_b = 0;
2781
2782 while (left) {
2783 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2784 if (bit_a >= bitmap_len)
2785 break;
2786 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2787 bit_a + 1) - 1;
2788
2789 if (!first) {
2790 err = proc_put_char(&buffer, &left, ',');
2791 if (err)
2792 break;
2793 }
2794 err = proc_put_long(&buffer, &left, bit_a, false);
2795 if (err)
2796 break;
2797 if (bit_a != bit_b) {
2798 err = proc_put_char(&buffer, &left, '-');
2799 if (err)
2800 break;
2801 err = proc_put_long(&buffer, &left, bit_b, false);
2802 if (err)
2803 break;
2804 }
2805
2806 first = 0; bit_b++;
2807 }
2808 if (!err)
2809 err = proc_put_char(&buffer, &left, '\n');
2810 }
2811
2812 if (!err) {
2813 if (write) {
2814 if (*ppos)
2815 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2816 else
5a04cca6 2817 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 2818 }
2819 kfree(tmp_bitmap);
2820 *lenp -= left;
2821 *ppos += *lenp;
2822 return 0;
2823 } else {
2824 kfree(tmp_bitmap);
2825 return err;
2826 }
2827}
2828
55610500 2829#else /* CONFIG_PROC_SYSCTL */
1da177e4 2830
8d65af78 2831int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2832 void __user *buffer, size_t *lenp, loff_t *ppos)
2833{
2834 return -ENOSYS;
2835}
2836
8d65af78 2837int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2838 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2839{
2840 return -ENOSYS;
2841}
2842
8d65af78 2843int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2844 void __user *buffer, size_t *lenp, loff_t *ppos)
2845{
2846 return -ENOSYS;
2847}
2848
8d65af78 2849int proc_dointvec_jiffies(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_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2856 void __user *buffer, size_t *lenp, loff_t *ppos)
2857{
2858 return -ENOSYS;
2859}
2860
8d65af78 2861int proc_dointvec_ms_jiffies(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_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2868 void __user *buffer, size_t *lenp, loff_t *ppos)
2869{
2870 return -ENOSYS;
2871}
2872
d8217f07 2873int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2874 void __user *buffer,
2875 size_t *lenp, loff_t *ppos)
2876{
2877 return -ENOSYS;
2878}
2879
2880
55610500 2881#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2882
1da177e4
LT		 2883/*
2884 * No sense putting this after each symbol definition, twice,
2885 * exception granted :-)
2886 */
2887EXPORT_SYMBOL(proc_dointvec);
2888EXPORT_SYMBOL(proc_dointvec_jiffies);
2889EXPORT_SYMBOL(proc_dointvec_minmax);
2890EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2891EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2892EXPORT_SYMBOL(proc_dostring);
2893EXPORT_SYMBOL(proc_doulongvec_minmax);
2894EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux 6.x block layer and io_uring tree(s)