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mm, page_alloc: wake kswapd based on the highest eligible zone
[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 },
088e9d25
DBO		 1207#endif
1208#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1209 {
1210 .procname = "panic_on_rcu_stall",
1211 .data = &sysctl_panic_on_rcu_stall,
1212 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1213 .mode = 0644,
1214 .proc_handler = proc_dointvec_minmax,
1215 .extra1 = &zero,
1216 .extra2 = &one,
1217 },
bc7a34b8 1218#endif
6fce56ec 1219 { }
1da177e4
LT		 1220};
1221
d8217f07 1222static struct ctl_table vm_table[] = {
1da177e4 1223 {
1da177e4
LT		 1224 .procname = "overcommit_memory",
1225 .data = &sysctl_overcommit_memory,
1226 .maxlen = sizeof(sysctl_overcommit_memory),
1227 .mode = 0644,
cb16e95f
PH		 1228 .proc_handler = proc_dointvec_minmax,
1229 .extra1 = &zero,
1230 .extra2 = &two,
1da177e4 1231 },
fadd8fbd 1232 {
fadd8fbd
KH		 1233 .procname = "panic_on_oom",
1234 .data = &sysctl_panic_on_oom,
1235 .maxlen = sizeof(sysctl_panic_on_oom),
1236 .mode = 0644,
cb16e95f
PH		 1237 .proc_handler = proc_dointvec_minmax,
1238 .extra1 = &zero,
1239 .extra2 = &two,
fadd8fbd 1240 },
fe071d7e 1241 {
fe071d7e
DR		 1242 .procname = "oom_kill_allocating_task",
1243 .data = &sysctl_oom_kill_allocating_task,
1244 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1245 .mode = 0644,
6d456111 1246 .proc_handler = proc_dointvec,
fe071d7e 1247 },
fef1bdd6 1248 {
fef1bdd6
DR		 1249 .procname = "oom_dump_tasks",
1250 .data = &sysctl_oom_dump_tasks,
1251 .maxlen = sizeof(sysctl_oom_dump_tasks),
1252 .mode = 0644,
6d456111 1253 .proc_handler = proc_dointvec,
fef1bdd6 1254 },
1da177e4 1255 {
1da177e4
LT		 1256 .procname = "overcommit_ratio",
1257 .data = &sysctl_overcommit_ratio,
1258 .maxlen = sizeof(sysctl_overcommit_ratio),
1259 .mode = 0644,
49f0ce5f
JM		 1260 .proc_handler = overcommit_ratio_handler,
1261 },
1262 {
1263 .procname = "overcommit_kbytes",
1264 .data = &sysctl_overcommit_kbytes,
1265 .maxlen = sizeof(sysctl_overcommit_kbytes),
1266 .mode = 0644,
1267 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1268 },
1269 {
1da177e4
LT		 1270 .procname = "page-cluster",
1271 .data = &page_cluster,
1272 .maxlen = sizeof(int),
1273 .mode = 0644,
cb16e95f
PH		 1274 .proc_handler = proc_dointvec_minmax,
1275 .extra1 = &zero,
1da177e4
LT		 1276 },
1277 {
1da177e4
LT		 1278 .procname = "dirty_background_ratio",
1279 .data = &dirty_background_ratio,
1280 .maxlen = sizeof(dirty_background_ratio),
1281 .mode = 0644,
6d456111 1282 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1283 .extra1 = &zero,
1284 .extra2 = &one_hundred,
1285 },
2da02997 1286 {
2da02997
DR		 1287 .procname = "dirty_background_bytes",
1288 .data = &dirty_background_bytes,
1289 .maxlen = sizeof(dirty_background_bytes),
1290 .mode = 0644,
6d456111 1291 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1292 .extra1 = &one_ul,
2da02997 1293 },
1da177e4 1294 {
1da177e4
LT		 1295 .procname = "dirty_ratio",
1296 .data = &vm_dirty_ratio,
1297 .maxlen = sizeof(vm_dirty_ratio),
1298 .mode = 0644,
6d456111 1299 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1300 .extra1 = &zero,
1301 .extra2 = &one_hundred,
1302 },
2da02997 1303 {
2da02997
DR		 1304 .procname = "dirty_bytes",
1305 .data = &vm_dirty_bytes,
1306 .maxlen = sizeof(vm_dirty_bytes),
1307 .mode = 0644,
6d456111 1308 .proc_handler = dirty_bytes_handler,
9e4a5bda 1309 .extra1 = &dirty_bytes_min,
2da02997 1310 },
1da177e4 1311 {
1da177e4 1312 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1313 .data = &dirty_writeback_interval,
1314 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1315 .mode = 0644,
6d456111 1316 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1317 },
1318 {
1da177e4 1319 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1320 .data = &dirty_expire_interval,
1321 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1322 .mode = 0644,
cb16e95f
PH		 1323 .proc_handler = proc_dointvec_minmax,
1324 .extra1 = &zero,
1da177e4 1325 },
1efff914
TT		 1326 {
1327 .procname = "dirtytime_expire_seconds",
1328 .data = &dirtytime_expire_interval,
1329 .maxlen = sizeof(dirty_expire_interval),
1330 .mode = 0644,
1331 .proc_handler = dirtytime_interval_handler,
1332 .extra1 = &zero,
1333 },
1da177e4 1334 {
3965c9ae
WL		 1335 .procname = "nr_pdflush_threads",
1336 .mode = 0444 /* read-only */,
1337 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1338 },
1339 {
1da177e4
LT		 1340 .procname = "swappiness",
1341 .data = &vm_swappiness,
1342 .maxlen = sizeof(vm_swappiness),
1343 .mode = 0644,
6d456111 1344 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1345 .extra1 = &zero,
1346 .extra2 = &one_hundred,
1347 },
1348#ifdef CONFIG_HUGETLB_PAGE
06808b08 1349 {
1da177e4 1350 .procname = "nr_hugepages",
e5ff2159 1351 .data = NULL,
1da177e4
LT		 1352 .maxlen = sizeof(unsigned long),
1353 .mode = 0644,
6d456111 1354 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1355 },
1356#ifdef CONFIG_NUMA
1357 {
1358 .procname = "nr_hugepages_mempolicy",
1359 .data = NULL,
1360 .maxlen = sizeof(unsigned long),
1361 .mode = 0644,
1362 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1363 },
1364#endif
1da177e4 1365 {
1da177e4
LT		 1366 .procname = "hugetlb_shm_group",
1367 .data = &sysctl_hugetlb_shm_group,
1368 .maxlen = sizeof(gid_t),
1369 .mode = 0644,
6d456111 1370 .proc_handler = proc_dointvec,
1da177e4 1371 },
396faf03 1372 {
396faf03
MG		 1373 .procname = "hugepages_treat_as_movable",
1374 .data = &hugepages_treat_as_movable,
1375 .maxlen = sizeof(int),
1376 .mode = 0644,
86cdb465 1377 .proc_handler = proc_dointvec,
396faf03 1378 },
d1c3fb1f 1379 {
d1c3fb1f 1380 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1381 .data = NULL,
1382 .maxlen = sizeof(unsigned long),
d1c3fb1f 1383 .mode = 0644,
6d456111 1384 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1385 },
1da177e4
LT		 1386#endif
1387 {
1da177e4
LT		 1388 .procname = "lowmem_reserve_ratio",
1389 .data = &sysctl_lowmem_reserve_ratio,
1390 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1391 .mode = 0644,
6d456111 1392 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1393 },
9d0243bc 1394 {
9d0243bc
AM		 1395 .procname = "drop_caches",
1396 .data = &sysctl_drop_caches,
1397 .maxlen = sizeof(int),
1398 .mode = 0644,
1399 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1400 .extra1 = &one,
5509a5d2 1401 .extra2 = &four,
9d0243bc 1402 },
76ab0f53
MG		 1403#ifdef CONFIG_COMPACTION
1404 {
1405 .procname = "compact_memory",
1406 .data = &sysctl_compact_memory,
1407 .maxlen = sizeof(int),
1408 .mode = 0200,
1409 .proc_handler = sysctl_compaction_handler,
1410 },
5e771905
MG		 1411 {
1412 .procname = "extfrag_threshold",
1413 .data = &sysctl_extfrag_threshold,
1414 .maxlen = sizeof(int),
1415 .mode = 0644,
1416 .proc_handler = sysctl_extfrag_handler,
1417 .extra1 = &min_extfrag_threshold,
1418 .extra2 = &max_extfrag_threshold,
1419 },
5bbe3547
EM		 1420 {
1421 .procname = "compact_unevictable_allowed",
1422 .data = &sysctl_compact_unevictable_allowed,
1423 .maxlen = sizeof(int),
1424 .mode = 0644,
1425 .proc_handler = proc_dointvec,
1426 .extra1 = &zero,
1427 .extra2 = &one,
1428 },
5e771905 1429
76ab0f53 1430#endif /* CONFIG_COMPACTION */
1da177e4 1431 {
1da177e4
LT		 1432 .procname = "min_free_kbytes",
1433 .data = &min_free_kbytes,
1434 .maxlen = sizeof(min_free_kbytes),
1435 .mode = 0644,
6d456111 1436 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1437 .extra1 = &zero,
1438 },
795ae7a0
JW		 1439 {
1440 .procname = "watermark_scale_factor",
1441 .data = &watermark_scale_factor,
1442 .maxlen = sizeof(watermark_scale_factor),
1443 .mode = 0644,
1444 .proc_handler = watermark_scale_factor_sysctl_handler,
1445 .extra1 = &one,
1446 .extra2 = &one_thousand,
1447 },
8ad4b1fb 1448 {
8ad4b1fb
RS		 1449 .procname = "percpu_pagelist_fraction",
1450 .data = &percpu_pagelist_fraction,
1451 .maxlen = sizeof(percpu_pagelist_fraction),
1452 .mode = 0644,
6d456111 1453 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1454 .extra1 = &zero,
8ad4b1fb 1455 },
1da177e4
LT		 1456#ifdef CONFIG_MMU
1457 {
1da177e4
LT		 1458 .procname = "max_map_count",
1459 .data = &sysctl_max_map_count,
1460 .maxlen = sizeof(sysctl_max_map_count),
1461 .mode = 0644,
3e26120c 1462 .proc_handler = proc_dointvec_minmax,
70da2340 1463 .extra1 = &zero,
1da177e4 1464 },
dd8632a1
PM		 1465#else
1466 {
dd8632a1
PM		 1467 .procname = "nr_trim_pages",
1468 .data = &sysctl_nr_trim_pages,
1469 .maxlen = sizeof(sysctl_nr_trim_pages),
1470 .mode = 0644,
6d456111 1471 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1472 .extra1 = &zero,
1473 },
1da177e4
LT		 1474#endif
1475 {
1da177e4
LT		 1476 .procname = "laptop_mode",
1477 .data = &laptop_mode,
1478 .maxlen = sizeof(laptop_mode),
1479 .mode = 0644,
6d456111 1480 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1481 },
1482 {
1da177e4
LT		 1483 .procname = "block_dump",
1484 .data = &block_dump,
1485 .maxlen = sizeof(block_dump),
1486 .mode = 0644,
6d456111 1487 .proc_handler = proc_dointvec,
1da177e4
LT		 1488 .extra1 = &zero,
1489 },
1490 {
1da177e4
LT		 1491 .procname = "vfs_cache_pressure",
1492 .data = &sysctl_vfs_cache_pressure,
1493 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1494 .mode = 0644,
6d456111 1495 .proc_handler = proc_dointvec,
1da177e4
LT		 1496 .extra1 = &zero,
1497 },
1498#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1499 {
1da177e4
LT		 1500 .procname = "legacy_va_layout",
1501 .data = &sysctl_legacy_va_layout,
1502 .maxlen = sizeof(sysctl_legacy_va_layout),
1503 .mode = 0644,
6d456111 1504 .proc_handler = proc_dointvec,
1da177e4
LT		 1505 .extra1 = &zero,
1506 },
1507#endif
1743660b
CL		 1508#ifdef CONFIG_NUMA
1509 {
1743660b
CL		 1510 .procname = "zone_reclaim_mode",
1511 .data = &zone_reclaim_mode,
1512 .maxlen = sizeof(zone_reclaim_mode),
1513 .mode = 0644,
6d456111 1514 .proc_handler = proc_dointvec,
c84db23c 1515 .extra1 = &zero,
1743660b 1516 },
9614634f 1517 {
9614634f
CL		 1518 .procname = "min_unmapped_ratio",
1519 .data = &sysctl_min_unmapped_ratio,
1520 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1521 .mode = 0644,
6d456111 1522 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1523 .extra1 = &zero,
1524 .extra2 = &one_hundred,
1525 },
0ff38490 1526 {
0ff38490
CL		 1527 .procname = "min_slab_ratio",
1528 .data = &sysctl_min_slab_ratio,
1529 .maxlen = sizeof(sysctl_min_slab_ratio),
1530 .mode = 0644,
6d456111 1531 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1532 .extra1 = &zero,
1533 .extra2 = &one_hundred,
1534 },
e6e5494c 1535#endif
77461ab3
CL		 1536#ifdef CONFIG_SMP
1537 {
77461ab3
CL		 1538 .procname = "stat_interval",
1539 .data = &sysctl_stat_interval,
1540 .maxlen = sizeof(sysctl_stat_interval),
1541 .mode = 0644,
6d456111 1542 .proc_handler = proc_dointvec_jiffies,
77461ab3 1543 },
52b6f46b
HD		 1544 {
1545 .procname = "stat_refresh",
1546 .data = NULL,
1547 .maxlen = 0,
1548 .mode = 0600,
1549 .proc_handler = vmstat_refresh,
1550 },
77461ab3 1551#endif
6e141546 1552#ifdef CONFIG_MMU
ed032189 1553 {
ed032189 1554 .procname = "mmap_min_addr",
788084ab
EP		 1555 .data = &dac_mmap_min_addr,
1556 .maxlen = sizeof(unsigned long),
ed032189 1557 .mode = 0644,
6d456111 1558 .proc_handler = mmap_min_addr_handler,
ed032189 1559 },
6e141546 1560#endif
f0c0b2b8
KH		 1561#ifdef CONFIG_NUMA
1562 {
f0c0b2b8
KH		 1563 .procname = "numa_zonelist_order",
1564 .data = &numa_zonelist_order,
1565 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1566 .mode = 0644,
6d456111 1567 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1568 },
1569#endif
2b8232ce 1570#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1571 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1572 {
e6e5494c 1573 .procname = "vdso_enabled",
3d7ee969
AL		 1574#ifdef CONFIG_X86_32
1575 .data = &vdso32_enabled,
1576 .maxlen = sizeof(vdso32_enabled),
1577#else
e6e5494c
IM		 1578 .data = &vdso_enabled,
1579 .maxlen = sizeof(vdso_enabled),
3d7ee969 1580#endif
e6e5494c 1581 .mode = 0644,
6d456111 1582 .proc_handler = proc_dointvec,
e6e5494c
IM		 1583 .extra1 = &zero,
1584 },
1da177e4 1585#endif
195cf453
BG		 1586#ifdef CONFIG_HIGHMEM
1587 {
195cf453
BG		 1588 .procname = "highmem_is_dirtyable",
1589 .data = &vm_highmem_is_dirtyable,
1590 .maxlen = sizeof(vm_highmem_is_dirtyable),
1591 .mode = 0644,
6d456111 1592 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1593 .extra1 = &zero,
1594 .extra2 = &one,
1595 },
1596#endif
6a46079c
AK		 1597#ifdef CONFIG_MEMORY_FAILURE
1598 {
6a46079c
AK		 1599 .procname = "memory_failure_early_kill",
1600 .data = &sysctl_memory_failure_early_kill,
1601 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1602 .mode = 0644,
6d456111 1603 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1604 .extra1 = &zero,
1605 .extra2 = &one,
1606 },
1607 {
6a46079c
AK		 1608 .procname = "memory_failure_recovery",
1609 .data = &sysctl_memory_failure_recovery,
1610 .maxlen = sizeof(sysctl_memory_failure_recovery),
1611 .mode = 0644,
6d456111 1612 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1613 .extra1 = &zero,
1614 .extra2 = &one,
1615 },
1616#endif
c9b1d098
AS		 1617 {
1618 .procname = "user_reserve_kbytes",
1619 .data = &sysctl_user_reserve_kbytes,
1620 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1621 .mode = 0644,
1622 .proc_handler = proc_doulongvec_minmax,
1623 },
4eeab4f5
AS		 1624 {
1625 .procname = "admin_reserve_kbytes",
1626 .data = &sysctl_admin_reserve_kbytes,
1627 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1628 .mode = 0644,
1629 .proc_handler = proc_doulongvec_minmax,
1630 },
d07e2259
DC		 1631#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1632 {
1633 .procname = "mmap_rnd_bits",
1634 .data = &mmap_rnd_bits,
1635 .maxlen = sizeof(mmap_rnd_bits),
1636 .mode = 0600,
1637 .proc_handler = proc_dointvec_minmax,
1638 .extra1 = (void *)&mmap_rnd_bits_min,
1639 .extra2 = (void *)&mmap_rnd_bits_max,
1640 },
1641#endif
1642#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1643 {
1644 .procname = "mmap_rnd_compat_bits",
1645 .data = &mmap_rnd_compat_bits,
1646 .maxlen = sizeof(mmap_rnd_compat_bits),
1647 .mode = 0600,
1648 .proc_handler = proc_dointvec_minmax,
1649 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1650 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1651 },
1652#endif
6fce56ec 1653 { }
1da177e4
LT		 1654};
1655
d8217f07 1656static struct ctl_table fs_table[] = {
1da177e4 1657 {
1da177e4
LT		 1658 .procname = "inode-nr",
1659 .data = &inodes_stat,
3942c07c 1660 .maxlen = 2*sizeof(long),
1da177e4 1661 .mode = 0444,
cffbc8aa 1662 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1663 },
1664 {
1da177e4
LT		 1665 .procname = "inode-state",
1666 .data = &inodes_stat,
3942c07c 1667 .maxlen = 7*sizeof(long),
1da177e4 1668 .mode = 0444,
cffbc8aa 1669 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1670 },
1671 {
1da177e4
LT		 1672 .procname = "file-nr",
1673 .data = &files_stat,
518de9b3 1674 .maxlen = sizeof(files_stat),
1da177e4 1675 .mode = 0444,
6d456111 1676 .proc_handler = proc_nr_files,
1da177e4
LT		 1677 },
1678 {
1da177e4
LT		 1679 .procname = "file-max",
1680 .data = &files_stat.max_files,
518de9b3 1681 .maxlen = sizeof(files_stat.max_files),
1da177e4 1682 .mode = 0644,
518de9b3 1683 .proc_handler = proc_doulongvec_minmax,
1da177e4 1684 },
9cfe015a 1685 {
9cfe015a
ED		 1686 .procname = "nr_open",
1687 .data = &sysctl_nr_open,
1688 .maxlen = sizeof(int),
1689 .mode = 0644,
6d456111 1690 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1691 .extra1 = &sysctl_nr_open_min,
1692 .extra2 = &sysctl_nr_open_max,
9cfe015a 1693 },
1da177e4 1694 {
1da177e4
LT		 1695 .procname = "dentry-state",
1696 .data = &dentry_stat,
3942c07c 1697 .maxlen = 6*sizeof(long),
1da177e4 1698 .mode = 0444,
312d3ca8 1699 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1700 },
1701 {
1da177e4
LT		 1702 .procname = "overflowuid",
1703 .data = &fs_overflowuid,
1704 .maxlen = sizeof(int),
1705 .mode = 0644,
6d456111 1706 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1707 .extra1 = &minolduid,
1708 .extra2 = &maxolduid,
1709 },
1710 {
1da177e4
LT		 1711 .procname = "overflowgid",
1712 .data = &fs_overflowgid,
1713 .maxlen = sizeof(int),
1714 .mode = 0644,
6d456111 1715 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1716 .extra1 = &minolduid,
1717 .extra2 = &maxolduid,
1718 },
bfcd17a6 1719#ifdef CONFIG_FILE_LOCKING
1da177e4 1720 {
1da177e4
LT		 1721 .procname = "leases-enable",
1722 .data = &leases_enable,
1723 .maxlen = sizeof(int),
1724 .mode = 0644,
6d456111 1725 .proc_handler = proc_dointvec,
1da177e4 1726 },
bfcd17a6 1727#endif
1da177e4
LT		 1728#ifdef CONFIG_DNOTIFY
1729 {
1da177e4
LT		 1730 .procname = "dir-notify-enable",
1731 .data = &dir_notify_enable,
1732 .maxlen = sizeof(int),
1733 .mode = 0644,
6d456111 1734 .proc_handler = proc_dointvec,
1da177e4
LT		 1735 },
1736#endif
1737#ifdef CONFIG_MMU
bfcd17a6 1738#ifdef CONFIG_FILE_LOCKING
1da177e4 1739 {
1da177e4
LT		 1740 .procname = "lease-break-time",
1741 .data = &lease_break_time,
1742 .maxlen = sizeof(int),
1743 .mode = 0644,
6d456111 1744 .proc_handler = proc_dointvec,
1da177e4 1745 },
bfcd17a6 1746#endif
ebf3f09c 1747#ifdef CONFIG_AIO
1da177e4 1748 {
1da177e4
LT		 1749 .procname = "aio-nr",
1750 .data = &aio_nr,
1751 .maxlen = sizeof(aio_nr),
1752 .mode = 0444,
6d456111 1753 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1754 },
1755 {
1da177e4
LT		 1756 .procname = "aio-max-nr",
1757 .data = &aio_max_nr,
1758 .maxlen = sizeof(aio_max_nr),
1759 .mode = 0644,
6d456111 1760 .proc_handler = proc_doulongvec_minmax,
1da177e4 1761 },
ebf3f09c 1762#endif /* CONFIG_AIO */
2d9048e2 1763#ifdef CONFIG_INOTIFY_USER
0399cb08 1764 {
0399cb08
RL		 1765 .procname = "inotify",
1766 .mode = 0555,
1767 .child = inotify_table,
1768 },
1769#endif
7ef9964e
DL		 1770#ifdef CONFIG_EPOLL
1771 {
1772 .procname = "epoll",
1773 .mode = 0555,
1774 .child = epoll_table,
1775 },
1776#endif
1da177e4 1777#endif
800179c9
KC		 1778 {
1779 .procname = "protected_symlinks",
1780 .data = &sysctl_protected_symlinks,
1781 .maxlen = sizeof(int),
1782 .mode = 0600,
1783 .proc_handler = proc_dointvec_minmax,
1784 .extra1 = &zero,
1785 .extra2 = &one,
1786 },
1787 {
1788 .procname = "protected_hardlinks",
1789 .data = &sysctl_protected_hardlinks,
1790 .maxlen = sizeof(int),
1791 .mode = 0600,
1792 .proc_handler = proc_dointvec_minmax,
1793 .extra1 = &zero,
1794 .extra2 = &one,
1795 },
d6e71144 1796 {
d6e71144
AC		 1797 .procname = "suid_dumpable",
1798 .data = &suid_dumpable,
1799 .maxlen = sizeof(int),
1800 .mode = 0644,
54b50199 1801 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1802 .extra1 = &zero,
1803 .extra2 = &two,
d6e71144 1804 },
2abc26fc
EB		 1805#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1806 {
2abc26fc
EB		 1807 .procname = "binfmt_misc",
1808 .mode = 0555,
f9bd6733 1809 .child = sysctl_mount_point,
2abc26fc
EB		 1810 },
1811#endif
b492e95b 1812 {
ff9da691
JA		 1813 .procname = "pipe-max-size",
1814 .data = &pipe_max_size,
b492e95b
JA		 1815 .maxlen = sizeof(int),
1816 .mode = 0644,
ff9da691
JA		 1817 .proc_handler = &pipe_proc_fn,
1818 .extra1 = &pipe_min_size,
b492e95b 1819 },
759c0114
WT		 1820 {
1821 .procname = "pipe-user-pages-hard",
1822 .data = &pipe_user_pages_hard,
1823 .maxlen = sizeof(pipe_user_pages_hard),
1824 .mode = 0644,
1825 .proc_handler = proc_doulongvec_minmax,
1826 },
1827 {
1828 .procname = "pipe-user-pages-soft",
1829 .data = &pipe_user_pages_soft,
1830 .maxlen = sizeof(pipe_user_pages_soft),
1831 .mode = 0644,
1832 .proc_handler = proc_doulongvec_minmax,
1833 },
6fce56ec 1834 { }
1da177e4
LT		 1835};
1836
d8217f07 1837static struct ctl_table debug_table[] = {
7ac57a89 1838#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1839 {
abd4f750
MAS		 1840 .procname = "exception-trace",
1841 .data = &show_unhandled_signals,
1842 .maxlen = sizeof(int),
1843 .mode = 0644,
1844 .proc_handler = proc_dointvec
1845 },
b2be84df
MH		 1846#endif
1847#if defined(CONFIG_OPTPROBES)
1848 {
1849 .procname = "kprobes-optimization",
1850 .data = &sysctl_kprobes_optimization,
1851 .maxlen = sizeof(int),
1852 .mode = 0644,
1853 .proc_handler = proc_kprobes_optimization_handler,
1854 .extra1 = &zero,
1855 .extra2 = &one,
1856 },
abd4f750 1857#endif
6fce56ec 1858 { }
1da177e4
LT		 1859};
1860
d8217f07 1861static struct ctl_table dev_table[] = {
6fce56ec 1862 { }
0eeca283 1863};
1da177e4 1864
de4e83bd 1865int __init sysctl_init(void)
d912b0cc 1866{
fd4b616b
SR		 1867 struct ctl_table_header *hdr;
1868
1869 hdr = register_sysctl_table(sysctl_base_table);
1870 kmemleak_not_leak(hdr);
d912b0cc
EB		 1871 return 0;
1872}
1873
b89a8171
EB		 1874#endif /* CONFIG_SYSCTL */
1875
1da177e4
LT		 1876/*
1877 * /proc/sys support
1878 */
1879
b89a8171 1880#ifdef CONFIG_PROC_SYSCTL
1da177e4 1881
f8808300
KC		 1882static int _proc_do_string(char *data, int maxlen, int write,
1883 char __user *buffer,
b1ba4ddd 1884 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1885{
1886 size_t len;
1887 char __user *p;
1888 char c;
8d060877
ON		 1889
1890 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1891 *lenp = 0;
1892 return 0;
1893 }
8d060877 1894
1da177e4 1895 if (write) {
f4aacea2
KC		 1896 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1897 /* Only continue writes not past the end of buffer. */
1898 len = strlen(data);
1899 if (len > maxlen - 1)
1900 len = maxlen - 1;
1901
1902 if (*ppos > len)
1903 return 0;
1904 len = *ppos;
1905 } else {
1906 /* Start writing from beginning of buffer. */
1907 len = 0;
1908 }
1909
2ca9bb45 1910 *ppos += *lenp;
1da177e4 1911 p = buffer;
2ca9bb45 1912 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1913 if (get_user(c, p++))
1914 return -EFAULT;
1915 if (c == 0 || c == '\n')
1916 break;
2ca9bb45 1917 data[len++] = c;
1da177e4 1918 }
f8808300 1919 data[len] = 0;
1da177e4 1920 } else {
f5dd3d6f
SV		 1921 len = strlen(data);
1922 if (len > maxlen)
1923 len = maxlen;
8d060877
ON		 1924
1925 if (*ppos > len) {
1926 *lenp = 0;
1927 return 0;
1928 }
1929
1930 data += *ppos;
1931 len -= *ppos;
1932
1da177e4
LT		 1933 if (len > *lenp)
1934 len = *lenp;
1935 if (len)
f8808300 1936 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1937 return -EFAULT;
1938 if (len < *lenp) {
f8808300 1939 if (put_user('\n', buffer + len))
1da177e4
LT		 1940 return -EFAULT;
1941 len++;
1942 }
1943 *lenp = len;
1944 *ppos += len;
1945 }
1946 return 0;
1947}
1948
f4aacea2
KC		 1949static void warn_sysctl_write(struct ctl_table *table)
1950{
1951 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1952 "This will not be supported in the future. To silence this\n"
1953 "warning, set kernel.sysctl_writes_strict = -1\n",
1954 current->comm, table->procname);
1955}
1956
f5dd3d6f
SV		 1957/**
1958 * proc_dostring - read a string sysctl
1959 * @table: the sysctl table
1960 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 1961 * @buffer: the user buffer
1962 * @lenp: the size of the user buffer
1963 * @ppos: file position
1964 *
1965 * Reads/writes a string from/to the user buffer. If the kernel
1966 * buffer provided is not large enough to hold the string, the
1967 * string is truncated. The copied string is %NULL-terminated.
1968 * If the string is being read by the user process, it is copied
1969 * and a newline '\n' is added. It is truncated if the buffer is
1970 * not large enough.
1971 *
1972 * Returns 0 on success.
1973 */
8d65af78 1974int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 1975 void __user *buffer, size_t *lenp, loff_t *ppos)
1976{
f4aacea2
KC		 1977 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1978 warn_sysctl_write(table);
1979
f8808300
KC		 1980 return _proc_do_string((char *)(table->data), table->maxlen, write,
1981 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 1982}
1983
00b7c339
AW		 1984static size_t proc_skip_spaces(char **buf)
1985{
1986 size_t ret;
1987 char *tmp = skip_spaces(*buf);
1988 ret = tmp - *buf;
1989 *buf = tmp;
1990 return ret;
1991}
1992
9f977fb7
OP		 1993static void proc_skip_char(char **buf, size_t *size, const char v)
1994{
1995 while (*size) {
1996 if (**buf != v)
1997 break;
1998 (*size)--;
1999 (*buf)++;
2000 }
2001}
2002
00b7c339
AW		 2003#define TMPBUFLEN 22
2004/**
0fc377bd 2005 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2006 *
0fc377bd
RD		 2007 * @buf: a kernel buffer
2008 * @size: size of the kernel buffer
2009 * @val: this is where the number will be stored
2010 * @neg: set to %TRUE if number is negative
2011 * @perm_tr: a vector which contains the allowed trailers
2012 * @perm_tr_len: size of the perm_tr vector
2013 * @tr: pointer to store the trailer character
00b7c339 2014 *
0fc377bd
RD		 2015 * In case of success %0 is returned and @buf and @size are updated with
2016 * the amount of bytes read. If @tr is non-NULL and a trailing
2017 * character exists (size is non-zero after returning from this
2018 * function), @tr is updated with the trailing character.
00b7c339
AW		 2019 */
2020static int proc_get_long(char **buf, size_t *size,
2021 unsigned long *val, bool *neg,
2022 const char *perm_tr, unsigned perm_tr_len, char *tr)
2023{
2024 int len;
2025 char *p, tmp[TMPBUFLEN];
2026
2027 if (!*size)
2028 return -EINVAL;
2029
2030 len = *size;
2031 if (len > TMPBUFLEN - 1)
2032 len = TMPBUFLEN - 1;
2033
2034 memcpy(tmp, *buf, len);
2035
2036 tmp[len] = 0;
2037 p = tmp;
2038 if (*p == '-' && *size > 1) {
2039 *neg = true;
2040 p++;
2041 } else
2042 *neg = false;
2043 if (!isdigit(*p))
2044 return -EINVAL;
2045
2046 *val = simple_strtoul(p, &p, 0);
2047
2048 len = p - tmp;
2049
2050 /* We don't know if the next char is whitespace thus we may accept
2051 * invalid integers (e.g. 1234...a) or two integers instead of one
2052 * (e.g. 123...1). So lets not allow such large numbers. */
2053 if (len == TMPBUFLEN - 1)
2054 return -EINVAL;
2055
2056 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2057 return -EINVAL;
1da177e4 2058
00b7c339
AW		 2059 if (tr && (len < *size))
2060 *tr = *p;
2061
2062 *buf += len;
2063 *size -= len;
2064
2065 return 0;
2066}
2067
2068/**
0fc377bd 2069 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2070 *
0fc377bd
RD		 2071 * @buf: the user buffer
2072 * @size: the size of the user buffer
2073 * @val: the integer to be converted
2074 * @neg: sign of the number, %TRUE for negative
00b7c339 2075 *
0fc377bd
RD		 2076 * In case of success %0 is returned and @buf and @size are updated with
2077 * the amount of bytes written.
00b7c339
AW		 2078 */
2079static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2080 bool neg)
2081{
2082 int len;
2083 char tmp[TMPBUFLEN], *p = tmp;
2084
2085 sprintf(p, "%s%lu", neg ? "-" : "", val);
2086 len = strlen(tmp);
2087 if (len > *size)
2088 len = *size;
2089 if (copy_to_user(*buf, tmp, len))
2090 return -EFAULT;
2091 *size -= len;
2092 *buf += len;
2093 return 0;
2094}
2095#undef TMPBUFLEN
2096
2097static int proc_put_char(void __user **buf, size_t *size, char c)
2098{
2099 if (*size) {
2100 char __user **buffer = (char __user **)buf;
2101 if (put_user(c, *buffer))
2102 return -EFAULT;
2103 (*size)--, (*buffer)++;
2104 *buf = *buffer;
2105 }
2106 return 0;
2107}
1da177e4 2108
00b7c339 2109static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2110 int *valp,
2111 int write, void *data)
2112{
2113 if (write) {
230633d1
HS		 2114 if (*negp) {
2115 if (*lvalp > (unsigned long) INT_MAX + 1)
2116 return -EINVAL;
2117 *valp = -*lvalp;
2118 } else {
2119 if (*lvalp > (unsigned long) INT_MAX)
2120 return -EINVAL;
2121 *valp = *lvalp;
2122 }
1da177e4
LT		 2123 } else {
2124 int val = *valp;
2125 if (val < 0) {
00b7c339 2126 *negp = true;
9a5bc726 2127 *lvalp = -(unsigned long)val;
1da177e4 2128 } else {
00b7c339 2129 *negp = false;
1da177e4
LT		 2130 *lvalp = (unsigned long)val;
2131 }
2132 }
2133 return 0;
2134}
2135
00b7c339
AW		 2136static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2137
d8217f07 2138static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2139 int write, void __user *buffer,
fcfbd547 2140 size_t *lenp, loff_t *ppos,
00b7c339 2141 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2142 int write, void *data),
2143 void *data)
2144{
00b7c339 2145 int *i, vleft, first = 1, err = 0;
00b7c339 2146 size_t left;
70f6cbb6 2147 char *kbuf = NULL, *p;
1da177e4 2148
00b7c339 2149 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2150 *lenp = 0;
2151 return 0;
2152 }
2153
fcfbd547 2154 i = (int *) tbl_data;
1da177e4
LT		 2155 vleft = table->maxlen / sizeof(*i);
2156 left = *lenp;
2157
2158 if (!conv)
2159 conv = do_proc_dointvec_conv;
2160
00b7c339 2161 if (write) {
f4aacea2
KC		 2162 if (*ppos) {
2163 switch (sysctl_writes_strict) {
2164 case SYSCTL_WRITES_STRICT:
2165 goto out;
2166 case SYSCTL_WRITES_WARN:
2167 warn_sysctl_write(table);
2168 break;
2169 default:
2170 break;
2171 }
2172 }
2173
00b7c339
AW		 2174 if (left > PAGE_SIZE - 1)
2175 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2176 p = kbuf = memdup_user_nul(buffer, left);
2177 if (IS_ERR(kbuf))
2178 return PTR_ERR(kbuf);
00b7c339
AW		 2179 }
2180
1da177e4 2181 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2182 unsigned long lval;
2183 bool neg;
1da177e4 2184
00b7c339 2185 if (write) {
70f6cbb6 2186 left -= proc_skip_spaces(&p);
1da177e4 2187
563b0467
O		 2188 if (!left)
2189 break;
70f6cbb6 2190 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2191 proc_wspace_sep,
2192 sizeof(proc_wspace_sep), NULL);
2193 if (err)
1da177e4 2194 break;
00b7c339
AW		 2195 if (conv(&neg, &lval, i, 1, data)) {
2196 err = -EINVAL;
1da177e4 2197 break;
00b7c339 2198 }
1da177e4 2199 } else {
00b7c339
AW		 2200 if (conv(&neg, &lval, i, 0, data)) {
2201 err = -EINVAL;
2202 break;
2203 }
1da177e4 2204 if (!first)
00b7c339
AW		 2205 err = proc_put_char(&buffer, &left, '\t');
2206 if (err)
2207 break;
2208 err = proc_put_long(&buffer, &left, lval, neg);
2209 if (err)
1da177e4 2210 break;
1da177e4
LT		 2211 }
2212 }
2213
00b7c339
AW		 2214 if (!write && !first && left && !err)
2215 err = proc_put_char(&buffer, &left, '\n');
563b0467 2216 if (write && !err && left)
70f6cbb6 2217 left -= proc_skip_spaces(&p);
1da177e4 2218 if (write) {
70f6cbb6 2219 kfree(kbuf);
00b7c339
AW		 2220 if (first)
2221 return err ? : -EINVAL;
1da177e4 2222 }
1da177e4 2223 *lenp -= left;
f4aacea2 2224out:
1da177e4 2225 *ppos += *lenp;
00b7c339 2226 return err;
1da177e4
LT		 2227}
2228
8d65af78 2229static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2230 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2231 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2232 int write, void *data),
2233 void *data)
2234{
8d65af78 2235 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2236 buffer, lenp, ppos, conv, data);
2237}
2238
1da177e4
LT		 2239/**
2240 * proc_dointvec - read a vector of integers
2241 * @table: the sysctl table
2242 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2243 * @buffer: the user buffer
2244 * @lenp: the size of the user buffer
2245 * @ppos: file position
2246 *
2247 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2248 * values from/to the user buffer, treated as an ASCII string.
2249 *
2250 * Returns 0 on success.
2251 */
8d65af78 2252int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2253 void __user *buffer, size_t *lenp, loff_t *ppos)
2254{
8d65af78 2255 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2256 NULL,NULL);
2257}
2258
34f5a398 2259/*
25ddbb18
AK		 2260 * Taint values can only be increased
2261 * This means we can safely use a temporary.
34f5a398 2262 */
8d65af78 2263static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2264 void __user *buffer, size_t *lenp, loff_t *ppos)
2265{
25ddbb18
AK		 2266 struct ctl_table t;
2267 unsigned long tmptaint = get_taint();
2268 int err;
34f5a398 2269
91fcd412 2270 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2271 return -EPERM;
2272
25ddbb18
AK		 2273 t = *table;
2274 t.data = &tmptaint;
8d65af78 2275 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2276 if (err < 0)
2277 return err;
2278
2279 if (write) {
2280 /*
2281 * Poor man's atomic or. Not worth adding a primitive
2282 * to everyone's atomic.h for this
2283 */
2284 int i;
2285 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2286 if ((tmptaint >> i) & 1)
373d4d09 2287 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2288 }
2289 }
2290
2291 return err;
34f5a398
TT		 2292}
2293
bfdc0b49 2294#ifdef CONFIG_PRINTK
620f6e8e 2295static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2296 void __user *buffer, size_t *lenp, loff_t *ppos)
2297{
2298 if (write && !capable(CAP_SYS_ADMIN))
2299 return -EPERM;
2300
2301 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2302}
2303#endif
2304
1da177e4
LT		 2305struct do_proc_dointvec_minmax_conv_param {
2306 int *min;
2307 int *max;
2308};
2309
00b7c339
AW		 2310static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2311 int *valp,
1da177e4
LT		 2312 int write, void *data)
2313{
2314 struct do_proc_dointvec_minmax_conv_param *param = data;
2315 if (write) {
2316 int val = *negp ? -*lvalp : *lvalp;
2317 if ((param->min && *param->min > val) ||
2318 (param->max && *param->max < val))
2319 return -EINVAL;
2320 *valp = val;
2321 } else {
2322 int val = *valp;
2323 if (val < 0) {
00b7c339 2324 *negp = true;
9a5bc726 2325 *lvalp = -(unsigned long)val;
1da177e4 2326 } else {
00b7c339 2327 *negp = false;
1da177e4
LT		 2328 *lvalp = (unsigned long)val;
2329 }
2330 }
2331 return 0;
2332}
2333
2334/**
2335 * proc_dointvec_minmax - read a vector of integers with min/max values
2336 * @table: the sysctl table
2337 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2338 * @buffer: the user buffer
2339 * @lenp: the size of the user buffer
2340 * @ppos: file position
2341 *
2342 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2343 * values from/to the user buffer, treated as an ASCII string.
2344 *
2345 * This routine will ensure the values are within the range specified by
2346 * table->extra1 (min) and table->extra2 (max).
2347 *
2348 * Returns 0 on success.
2349 */
8d65af78 2350int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2351 void __user *buffer, size_t *lenp, loff_t *ppos)
2352{
2353 struct do_proc_dointvec_minmax_conv_param param = {
2354 .min = (int *) table->extra1,
2355 .max = (int *) table->extra2,
2356 };
8d65af78 2357 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2358 do_proc_dointvec_minmax_conv, &param);
2359}
2360
54b50199
KC		 2361static void validate_coredump_safety(void)
2362{
046d662f 2363#ifdef CONFIG_COREDUMP
e579d2c2 2364 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199
KC		 2365 core_pattern[0] != '/' && core_pattern[0] != '|') {
2366 printk(KERN_WARNING "Unsafe core_pattern used with "\
2367 "suid_dumpable=2. Pipe handler or fully qualified "\
2368 "core dump path required.\n");
2369 }
046d662f 2370#endif
54b50199
KC		 2371}
2372
2373static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2374 void __user *buffer, size_t *lenp, loff_t *ppos)
2375{
2376 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2377 if (!error)
2378 validate_coredump_safety();
2379 return error;
2380}
2381
046d662f 2382#ifdef CONFIG_COREDUMP
54b50199
KC		 2383static int proc_dostring_coredump(struct ctl_table *table, int write,
2384 void __user *buffer, size_t *lenp, loff_t *ppos)
2385{
2386 int error = proc_dostring(table, write, buffer, lenp, ppos);
2387 if (!error)
2388 validate_coredump_safety();
2389 return error;
2390}
046d662f 2391#endif
54b50199 2392
d8217f07 2393static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2394 void __user *buffer,
2395 size_t *lenp, loff_t *ppos,
2396 unsigned long convmul,
2397 unsigned long convdiv)
2398{
00b7c339
AW		 2399 unsigned long *i, *min, *max;
2400 int vleft, first = 1, err = 0;
00b7c339 2401 size_t left;
70f6cbb6 2402 char *kbuf = NULL, *p;
00b7c339
AW		 2403
2404 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2405 *lenp = 0;
2406 return 0;
2407 }
00b7c339 2408
fcfbd547 2409 i = (unsigned long *) data;
1da177e4
LT		 2410 min = (unsigned long *) table->extra1;
2411 max = (unsigned long *) table->extra2;
2412 vleft = table->maxlen / sizeof(unsigned long);
2413 left = *lenp;
00b7c339
AW		 2414
2415 if (write) {
f4aacea2
KC		 2416 if (*ppos) {
2417 switch (sysctl_writes_strict) {
2418 case SYSCTL_WRITES_STRICT:
2419 goto out;
2420 case SYSCTL_WRITES_WARN:
2421 warn_sysctl_write(table);
2422 break;
2423 default:
2424 break;
2425 }
2426 }
2427
00b7c339
AW		 2428 if (left > PAGE_SIZE - 1)
2429 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2430 p = kbuf = memdup_user_nul(buffer, left);
2431 if (IS_ERR(kbuf))
2432 return PTR_ERR(kbuf);
00b7c339
AW		 2433 }
2434
27b3d80a 2435 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2436 unsigned long val;
2437
1da177e4 2438 if (write) {
00b7c339
AW		 2439 bool neg;
2440
70f6cbb6 2441 left -= proc_skip_spaces(&p);
00b7c339 2442
70f6cbb6 2443 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2444 proc_wspace_sep,
2445 sizeof(proc_wspace_sep), NULL);
2446 if (err)
1da177e4
LT		 2447 break;
2448 if (neg)
1da177e4
LT		 2449 continue;
2450 if ((min && val < *min) || (max && val > *max))
2451 continue;
2452 *i = val;
2453 } else {
00b7c339 2454 val = convdiv * (*i) / convmul;
7833819d 2455 if (!first) {
00b7c339 2456 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2457 if (err)
2458 break;
2459 }
00b7c339
AW		 2460 err = proc_put_long(&buffer, &left, val, false);
2461 if (err)
2462 break;
1da177e4
LT		 2463 }
2464 }
2465
00b7c339
AW		 2466 if (!write && !first && left && !err)
2467 err = proc_put_char(&buffer, &left, '\n');
2468 if (write && !err)
70f6cbb6 2469 left -= proc_skip_spaces(&p);
1da177e4 2470 if (write) {
70f6cbb6 2471 kfree(kbuf);
00b7c339
AW		 2472 if (first)
2473 return err ? : -EINVAL;
1da177e4 2474 }
1da177e4 2475 *lenp -= left;
f4aacea2 2476out:
1da177e4 2477 *ppos += *lenp;
00b7c339 2478 return err;
1da177e4
LT		 2479}
2480
d8217f07 2481static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2482 void __user *buffer,
2483 size_t *lenp, loff_t *ppos,
2484 unsigned long convmul,
2485 unsigned long convdiv)
2486{
2487 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2488 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2489}
2490
1da177e4
LT		 2491/**
2492 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2493 * @table: the sysctl table
2494 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2495 * @buffer: the user buffer
2496 * @lenp: the size of the user buffer
2497 * @ppos: file position
2498 *
2499 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2500 * values from/to the user buffer, treated as an ASCII string.
2501 *
2502 * This routine will ensure the values are within the range specified by
2503 * table->extra1 (min) and table->extra2 (max).
2504 *
2505 * Returns 0 on success.
2506 */
8d65af78 2507int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2508 void __user *buffer, size_t *lenp, loff_t *ppos)
2509{
8d65af78 2510 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2511}
2512
2513/**
2514 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2515 * @table: the sysctl table
2516 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2517 * @buffer: the user buffer
2518 * @lenp: the size of the user buffer
2519 * @ppos: file position
2520 *
2521 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2522 * values from/to the user buffer, treated as an ASCII string. The values
2523 * are treated as milliseconds, and converted to jiffies when they are stored.
2524 *
2525 * This routine will ensure the values are within the range specified by
2526 * table->extra1 (min) and table->extra2 (max).
2527 *
2528 * Returns 0 on success.
2529 */
d8217f07 2530int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2531 void __user *buffer,
2532 size_t *lenp, loff_t *ppos)
2533{
8d65af78 2534 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2535 lenp, ppos, HZ, 1000l);
2536}
2537
2538
00b7c339 2539static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2540 int *valp,
2541 int write, void *data)
2542{
2543 if (write) {
cba9f33d
BS		 2544 if (*lvalp > LONG_MAX / HZ)
2545 return 1;
1da177e4
LT		 2546 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2547 } else {
2548 int val = *valp;
2549 unsigned long lval;
2550 if (val < 0) {
00b7c339 2551 *negp = true;
9a5bc726 2552 lval = -(unsigned long)val;
1da177e4 2553 } else {
00b7c339 2554 *negp = false;
1da177e4
LT		 2555 lval = (unsigned long)val;
2556 }
2557 *lvalp = lval / HZ;
2558 }
2559 return 0;
2560}
2561
00b7c339 2562static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2563 int *valp,
2564 int write, void *data)
2565{
2566 if (write) {
cba9f33d
BS		 2567 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2568 return 1;
1da177e4
LT		 2569 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2570 } else {
2571 int val = *valp;
2572 unsigned long lval;
2573 if (val < 0) {
00b7c339 2574 *negp = true;
9a5bc726 2575 lval = -(unsigned long)val;
1da177e4 2576 } else {
00b7c339 2577 *negp = false;
1da177e4
LT		 2578 lval = (unsigned long)val;
2579 }
2580 *lvalp = jiffies_to_clock_t(lval);
2581 }
2582 return 0;
2583}
2584
00b7c339 2585static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2586 int *valp,
2587 int write, void *data)
2588{
2589 if (write) {
d738ce8f
FF		 2590 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2591
2592 if (jif > INT_MAX)
2593 return 1;
2594 *valp = (int)jif;
1da177e4
LT		 2595 } else {
2596 int val = *valp;
2597 unsigned long lval;
2598 if (val < 0) {
00b7c339 2599 *negp = true;
9a5bc726 2600 lval = -(unsigned long)val;
1da177e4 2601 } else {
00b7c339 2602 *negp = false;
1da177e4
LT		 2603 lval = (unsigned long)val;
2604 }
2605 *lvalp = jiffies_to_msecs(lval);
2606 }
2607 return 0;
2608}
2609
2610/**
2611 * proc_dointvec_jiffies - read a vector of integers as seconds
2612 * @table: the sysctl table
2613 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2614 * @buffer: the user buffer
2615 * @lenp: the size of the user buffer
2616 * @ppos: file position
2617 *
2618 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2619 * values from/to the user buffer, treated as an ASCII string.
2620 * The values read are assumed to be in seconds, and are converted into
2621 * jiffies.
2622 *
2623 * Returns 0 on success.
2624 */
8d65af78 2625int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2626 void __user *buffer, size_t *lenp, loff_t *ppos)
2627{
8d65af78 2628 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2629 do_proc_dointvec_jiffies_conv,NULL);
2630}
2631
2632/**
2633 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2634 * @table: the sysctl table
2635 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2636 * @buffer: the user buffer
2637 * @lenp: the size of the user buffer
1e5d5331 2638 * @ppos: pointer to the file position
1da177e4
LT		 2639 *
2640 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2641 * values from/to the user buffer, treated as an ASCII string.
2642 * The values read are assumed to be in 1/USER_HZ seconds, and
2643 * are converted into jiffies.
2644 *
2645 * Returns 0 on success.
2646 */
8d65af78 2647int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2648 void __user *buffer, size_t *lenp, loff_t *ppos)
2649{
8d65af78 2650 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2651 do_proc_dointvec_userhz_jiffies_conv,NULL);
2652}
2653
2654/**
2655 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2656 * @table: the sysctl table
2657 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2658 * @buffer: the user buffer
2659 * @lenp: the size of the user buffer
67be2dd1
MW		 2660 * @ppos: file position
2661 * @ppos: the current position in the file
1da177e4
LT		 2662 *
2663 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2664 * values from/to the user buffer, treated as an ASCII string.
2665 * The values read are assumed to be in 1/1000 seconds, and
2666 * are converted into jiffies.
2667 *
2668 * Returns 0 on success.
2669 */
8d65af78 2670int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2671 void __user *buffer, size_t *lenp, loff_t *ppos)
2672{
8d65af78 2673 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2674 do_proc_dointvec_ms_jiffies_conv, NULL);
2675}
2676
8d65af78 2677static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2678 void __user *buffer, size_t *lenp, loff_t *ppos)
2679{
2680 struct pid *new_pid;
2681 pid_t tmp;
2682 int r;
2683
6c5f3e7b 2684 tmp = pid_vnr(cad_pid);
9ec52099 2685
8d65af78 2686 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2687 lenp, ppos, NULL, NULL);
2688 if (r || !write)
2689 return r;
2690
2691 new_pid = find_get_pid(tmp);
2692 if (!new_pid)
2693 return -ESRCH;
2694
2695 put_pid(xchg(&cad_pid, new_pid));
2696 return 0;
2697}
2698
9f977fb7
OP		 2699/**
2700 * proc_do_large_bitmap - read/write from/to a large bitmap
2701 * @table: the sysctl table
2702 * @write: %TRUE if this is a write to the sysctl file
2703 * @buffer: the user buffer
2704 * @lenp: the size of the user buffer
2705 * @ppos: file position
2706 *
2707 * The bitmap is stored at table->data and the bitmap length (in bits)
2708 * in table->maxlen.
2709 *
2710 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2711 * large bitmaps may be represented in a compact manner. Writing into
2712 * the file will clear the bitmap then update it with the given input.
2713 *
2714 * Returns 0 on success.
2715 */
2716int proc_do_large_bitmap(struct ctl_table *table, int write,
2717 void __user *buffer, size_t *lenp, loff_t *ppos)
2718{
2719 int err = 0;
2720 bool first = 1;
2721 size_t left = *lenp;
2722 unsigned long bitmap_len = table->maxlen;
122ff243 2723 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2724 unsigned long *tmp_bitmap = NULL;
2725 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2726
122ff243 2727 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2728 *lenp = 0;
2729 return 0;
2730 }
2731
2732 if (write) {
70f6cbb6 2733 char *kbuf, *p;
9f977fb7
OP		 2734
2735 if (left > PAGE_SIZE - 1)
2736 left = PAGE_SIZE - 1;
2737
70f6cbb6
AV		 2738 p = kbuf = memdup_user_nul(buffer, left);
2739 if (IS_ERR(kbuf))
2740 return PTR_ERR(kbuf);
9f977fb7
OP		 2741
2742 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2743 GFP_KERNEL);
2744 if (!tmp_bitmap) {
70f6cbb6 2745 kfree(kbuf);
9f977fb7
OP		 2746 return -ENOMEM;
2747 }
70f6cbb6 2748 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 2749 while (!err && left) {
2750 unsigned long val_a, val_b;
2751 bool neg;
2752
70f6cbb6 2753 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 2754 sizeof(tr_a), &c);
2755 if (err)
2756 break;
2757 if (val_a >= bitmap_len || neg) {
2758 err = -EINVAL;
2759 break;
2760 }
2761
2762 val_b = val_a;
2763 if (left) {
70f6cbb6 2764 p++;
9f977fb7
OP		 2765 left--;
2766 }
2767
2768 if (c == '-') {
70f6cbb6 2769 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 2770 &neg, tr_b, sizeof(tr_b),
2771 &c);
2772 if (err)
2773 break;
2774 if (val_b >= bitmap_len || neg ||
2775 val_a > val_b) {
2776 err = -EINVAL;
2777 break;
2778 }
2779 if (left) {
70f6cbb6 2780 p++;
9f977fb7
OP		 2781 left--;
2782 }
2783 }
2784
5a04cca6 2785 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 2786 first = 0;
70f6cbb6 2787 proc_skip_char(&p, &left, '\n');
9f977fb7 2788 }
70f6cbb6 2789 kfree(kbuf);
9f977fb7
OP		 2790 } else {
2791 unsigned long bit_a, bit_b = 0;
2792
2793 while (left) {
2794 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2795 if (bit_a >= bitmap_len)
2796 break;
2797 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2798 bit_a + 1) - 1;
2799
2800 if (!first) {
2801 err = proc_put_char(&buffer, &left, ',');
2802 if (err)
2803 break;
2804 }
2805 err = proc_put_long(&buffer, &left, bit_a, false);
2806 if (err)
2807 break;
2808 if (bit_a != bit_b) {
2809 err = proc_put_char(&buffer, &left, '-');
2810 if (err)
2811 break;
2812 err = proc_put_long(&buffer, &left, bit_b, false);
2813 if (err)
2814 break;
2815 }
2816
2817 first = 0; bit_b++;
2818 }
2819 if (!err)
2820 err = proc_put_char(&buffer, &left, '\n');
2821 }
2822
2823 if (!err) {
2824 if (write) {
2825 if (*ppos)
2826 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2827 else
5a04cca6 2828 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 2829 }
2830 kfree(tmp_bitmap);
2831 *lenp -= left;
2832 *ppos += *lenp;
2833 return 0;
2834 } else {
2835 kfree(tmp_bitmap);
2836 return err;
2837 }
2838}
2839
55610500 2840#else /* CONFIG_PROC_SYSCTL */
1da177e4 2841
8d65af78 2842int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2843 void __user *buffer, size_t *lenp, loff_t *ppos)
2844{
2845 return -ENOSYS;
2846}
2847
8d65af78 2848int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2849 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2850{
2851 return -ENOSYS;
2852}
2853
8d65af78 2854int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2855 void __user *buffer, size_t *lenp, loff_t *ppos)
2856{
2857 return -ENOSYS;
2858}
2859
8d65af78 2860int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2861 void __user *buffer, size_t *lenp, loff_t *ppos)
2862{
2863 return -ENOSYS;
2864}
2865
8d65af78 2866int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2867 void __user *buffer, size_t *lenp, loff_t *ppos)
2868{
2869 return -ENOSYS;
2870}
2871
8d65af78 2872int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2873 void __user *buffer, size_t *lenp, loff_t *ppos)
2874{
2875 return -ENOSYS;
2876}
2877
8d65af78 2878int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2879 void __user *buffer, size_t *lenp, loff_t *ppos)
2880{
2881 return -ENOSYS;
2882}
2883
d8217f07 2884int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2885 void __user *buffer,
2886 size_t *lenp, loff_t *ppos)
2887{
2888 return -ENOSYS;
2889}
2890
2891
55610500 2892#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2893
1da177e4
LT		 2894/*
2895 * No sense putting this after each symbol definition, twice,
2896 * exception granted :-)
2897 */
2898EXPORT_SYMBOL(proc_dointvec);
2899EXPORT_SYMBOL(proc_dointvec_jiffies);
2900EXPORT_SYMBOL(proc_dointvec_minmax);
2901EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2902EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2903EXPORT_SYMBOL(proc_dostring);
2904EXPORT_SYMBOL(proc_doulongvec_minmax);
2905EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux 6.x block layer and io_uring tree(s)