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Merge branch 'for-4.7-zac' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
[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",
1152 .data = NULL, /* filled in by handler */
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 },
1ccd1549 1159#endif
dfec072e
VN		 1160#ifdef CONFIG_KMEMCHECK
1161 {
dfec072e
VN		 1162 .procname = "kmemcheck",
1163 .data = &kmemcheck_enabled,
1164 .maxlen = sizeof(int),
1165 .mode = 0644,
6d456111 1166 .proc_handler = proc_dointvec,
dfec072e 1167 },
cb684b5b 1168#endif
9e3961a0
PB		 1169 {
1170 .procname = "panic_on_warn",
1171 .data = &panic_on_warn,
1172 .maxlen = sizeof(int),
1173 .mode = 0644,
1174 .proc_handler = proc_dointvec_minmax,
1175 .extra1 = &zero,
1176 .extra2 = &one,
1177 },
bc7a34b8
TG		 1178#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1179 {
1180 .procname = "timer_migration",
1181 .data = &sysctl_timer_migration,
1182 .maxlen = sizeof(unsigned int),
1183 .mode = 0644,
1184 .proc_handler = timer_migration_handler,
1185 },
1be7f75d
AS		 1186#endif
1187#ifdef CONFIG_BPF_SYSCALL
1188 {
1189 .procname = "unprivileged_bpf_disabled",
1190 .data = &sysctl_unprivileged_bpf_disabled,
1191 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1192 .mode = 0644,
1193 /* only handle a transition from default "0" to "1" */
1194 .proc_handler = proc_dointvec_minmax,
1195 .extra1 = &one,
1196 .extra2 = &one,
1197 },
bc7a34b8 1198#endif
6fce56ec 1199 { }
1da177e4
LT		 1200};
1201
d8217f07 1202static struct ctl_table vm_table[] = {
1da177e4 1203 {
1da177e4
LT		 1204 .procname = "overcommit_memory",
1205 .data = &sysctl_overcommit_memory,
1206 .maxlen = sizeof(sysctl_overcommit_memory),
1207 .mode = 0644,
cb16e95f
PH		 1208 .proc_handler = proc_dointvec_minmax,
1209 .extra1 = &zero,
1210 .extra2 = &two,
1da177e4 1211 },
fadd8fbd 1212 {
fadd8fbd
KH		 1213 .procname = "panic_on_oom",
1214 .data = &sysctl_panic_on_oom,
1215 .maxlen = sizeof(sysctl_panic_on_oom),
1216 .mode = 0644,
cb16e95f
PH		 1217 .proc_handler = proc_dointvec_minmax,
1218 .extra1 = &zero,
1219 .extra2 = &two,
fadd8fbd 1220 },
fe071d7e 1221 {
fe071d7e
DR		 1222 .procname = "oom_kill_allocating_task",
1223 .data = &sysctl_oom_kill_allocating_task,
1224 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1225 .mode = 0644,
6d456111 1226 .proc_handler = proc_dointvec,
fe071d7e 1227 },
fef1bdd6 1228 {
fef1bdd6
DR		 1229 .procname = "oom_dump_tasks",
1230 .data = &sysctl_oom_dump_tasks,
1231 .maxlen = sizeof(sysctl_oom_dump_tasks),
1232 .mode = 0644,
6d456111 1233 .proc_handler = proc_dointvec,
fef1bdd6 1234 },
1da177e4 1235 {
1da177e4
LT		 1236 .procname = "overcommit_ratio",
1237 .data = &sysctl_overcommit_ratio,
1238 .maxlen = sizeof(sysctl_overcommit_ratio),
1239 .mode = 0644,
49f0ce5f
JM		 1240 .proc_handler = overcommit_ratio_handler,
1241 },
1242 {
1243 .procname = "overcommit_kbytes",
1244 .data = &sysctl_overcommit_kbytes,
1245 .maxlen = sizeof(sysctl_overcommit_kbytes),
1246 .mode = 0644,
1247 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1248 },
1249 {
1da177e4
LT		 1250 .procname = "page-cluster",
1251 .data = &page_cluster,
1252 .maxlen = sizeof(int),
1253 .mode = 0644,
cb16e95f
PH		 1254 .proc_handler = proc_dointvec_minmax,
1255 .extra1 = &zero,
1da177e4
LT		 1256 },
1257 {
1da177e4
LT		 1258 .procname = "dirty_background_ratio",
1259 .data = &dirty_background_ratio,
1260 .maxlen = sizeof(dirty_background_ratio),
1261 .mode = 0644,
6d456111 1262 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1263 .extra1 = &zero,
1264 .extra2 = &one_hundred,
1265 },
2da02997 1266 {
2da02997
DR		 1267 .procname = "dirty_background_bytes",
1268 .data = &dirty_background_bytes,
1269 .maxlen = sizeof(dirty_background_bytes),
1270 .mode = 0644,
6d456111 1271 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1272 .extra1 = &one_ul,
2da02997 1273 },
1da177e4 1274 {
1da177e4
LT		 1275 .procname = "dirty_ratio",
1276 .data = &vm_dirty_ratio,
1277 .maxlen = sizeof(vm_dirty_ratio),
1278 .mode = 0644,
6d456111 1279 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1280 .extra1 = &zero,
1281 .extra2 = &one_hundred,
1282 },
2da02997 1283 {
2da02997
DR		 1284 .procname = "dirty_bytes",
1285 .data = &vm_dirty_bytes,
1286 .maxlen = sizeof(vm_dirty_bytes),
1287 .mode = 0644,
6d456111 1288 .proc_handler = dirty_bytes_handler,
9e4a5bda 1289 .extra1 = &dirty_bytes_min,
2da02997 1290 },
1da177e4 1291 {
1da177e4 1292 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1293 .data = &dirty_writeback_interval,
1294 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1295 .mode = 0644,
6d456111 1296 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1297 },
1298 {
1da177e4 1299 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1300 .data = &dirty_expire_interval,
1301 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1302 .mode = 0644,
cb16e95f
PH		 1303 .proc_handler = proc_dointvec_minmax,
1304 .extra1 = &zero,
1da177e4 1305 },
1efff914
TT		 1306 {
1307 .procname = "dirtytime_expire_seconds",
1308 .data = &dirtytime_expire_interval,
1309 .maxlen = sizeof(dirty_expire_interval),
1310 .mode = 0644,
1311 .proc_handler = dirtytime_interval_handler,
1312 .extra1 = &zero,
1313 },
1da177e4 1314 {
3965c9ae
WL		 1315 .procname = "nr_pdflush_threads",
1316 .mode = 0444 /* read-only */,
1317 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1318 },
1319 {
1da177e4
LT		 1320 .procname = "swappiness",
1321 .data = &vm_swappiness,
1322 .maxlen = sizeof(vm_swappiness),
1323 .mode = 0644,
6d456111 1324 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1325 .extra1 = &zero,
1326 .extra2 = &one_hundred,
1327 },
1328#ifdef CONFIG_HUGETLB_PAGE
06808b08 1329 {
1da177e4 1330 .procname = "nr_hugepages",
e5ff2159 1331 .data = NULL,
1da177e4
LT		 1332 .maxlen = sizeof(unsigned long),
1333 .mode = 0644,
6d456111 1334 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1335 },
1336#ifdef CONFIG_NUMA
1337 {
1338 .procname = "nr_hugepages_mempolicy",
1339 .data = NULL,
1340 .maxlen = sizeof(unsigned long),
1341 .mode = 0644,
1342 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1343 },
1344#endif
1da177e4 1345 {
1da177e4
LT		 1346 .procname = "hugetlb_shm_group",
1347 .data = &sysctl_hugetlb_shm_group,
1348 .maxlen = sizeof(gid_t),
1349 .mode = 0644,
6d456111 1350 .proc_handler = proc_dointvec,
1da177e4 1351 },
396faf03 1352 {
396faf03
MG		 1353 .procname = "hugepages_treat_as_movable",
1354 .data = &hugepages_treat_as_movable,
1355 .maxlen = sizeof(int),
1356 .mode = 0644,
86cdb465 1357 .proc_handler = proc_dointvec,
396faf03 1358 },
d1c3fb1f 1359 {
d1c3fb1f 1360 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1361 .data = NULL,
1362 .maxlen = sizeof(unsigned long),
d1c3fb1f 1363 .mode = 0644,
6d456111 1364 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1365 },
1da177e4
LT		 1366#endif
1367 {
1da177e4
LT		 1368 .procname = "lowmem_reserve_ratio",
1369 .data = &sysctl_lowmem_reserve_ratio,
1370 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1371 .mode = 0644,
6d456111 1372 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1373 },
9d0243bc 1374 {
9d0243bc
AM		 1375 .procname = "drop_caches",
1376 .data = &sysctl_drop_caches,
1377 .maxlen = sizeof(int),
1378 .mode = 0644,
1379 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1380 .extra1 = &one,
5509a5d2 1381 .extra2 = &four,
9d0243bc 1382 },
76ab0f53
MG		 1383#ifdef CONFIG_COMPACTION
1384 {
1385 .procname = "compact_memory",
1386 .data = &sysctl_compact_memory,
1387 .maxlen = sizeof(int),
1388 .mode = 0200,
1389 .proc_handler = sysctl_compaction_handler,
1390 },
5e771905
MG		 1391 {
1392 .procname = "extfrag_threshold",
1393 .data = &sysctl_extfrag_threshold,
1394 .maxlen = sizeof(int),
1395 .mode = 0644,
1396 .proc_handler = sysctl_extfrag_handler,
1397 .extra1 = &min_extfrag_threshold,
1398 .extra2 = &max_extfrag_threshold,
1399 },
5bbe3547
EM		 1400 {
1401 .procname = "compact_unevictable_allowed",
1402 .data = &sysctl_compact_unevictable_allowed,
1403 .maxlen = sizeof(int),
1404 .mode = 0644,
1405 .proc_handler = proc_dointvec,
1406 .extra1 = &zero,
1407 .extra2 = &one,
1408 },
5e771905 1409
76ab0f53 1410#endif /* CONFIG_COMPACTION */
1da177e4 1411 {
1da177e4
LT		 1412 .procname = "min_free_kbytes",
1413 .data = &min_free_kbytes,
1414 .maxlen = sizeof(min_free_kbytes),
1415 .mode = 0644,
6d456111 1416 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1417 .extra1 = &zero,
1418 },
795ae7a0
JW		 1419 {
1420 .procname = "watermark_scale_factor",
1421 .data = &watermark_scale_factor,
1422 .maxlen = sizeof(watermark_scale_factor),
1423 .mode = 0644,
1424 .proc_handler = watermark_scale_factor_sysctl_handler,
1425 .extra1 = &one,
1426 .extra2 = &one_thousand,
1427 },
8ad4b1fb 1428 {
8ad4b1fb
RS		 1429 .procname = "percpu_pagelist_fraction",
1430 .data = &percpu_pagelist_fraction,
1431 .maxlen = sizeof(percpu_pagelist_fraction),
1432 .mode = 0644,
6d456111 1433 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1434 .extra1 = &zero,
8ad4b1fb 1435 },
1da177e4
LT		 1436#ifdef CONFIG_MMU
1437 {
1da177e4
LT		 1438 .procname = "max_map_count",
1439 .data = &sysctl_max_map_count,
1440 .maxlen = sizeof(sysctl_max_map_count),
1441 .mode = 0644,
3e26120c 1442 .proc_handler = proc_dointvec_minmax,
70da2340 1443 .extra1 = &zero,
1da177e4 1444 },
dd8632a1
PM		 1445#else
1446 {
dd8632a1
PM		 1447 .procname = "nr_trim_pages",
1448 .data = &sysctl_nr_trim_pages,
1449 .maxlen = sizeof(sysctl_nr_trim_pages),
1450 .mode = 0644,
6d456111 1451 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1452 .extra1 = &zero,
1453 },
1da177e4
LT		 1454#endif
1455 {
1da177e4
LT		 1456 .procname = "laptop_mode",
1457 .data = &laptop_mode,
1458 .maxlen = sizeof(laptop_mode),
1459 .mode = 0644,
6d456111 1460 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1461 },
1462 {
1da177e4
LT		 1463 .procname = "block_dump",
1464 .data = &block_dump,
1465 .maxlen = sizeof(block_dump),
1466 .mode = 0644,
6d456111 1467 .proc_handler = proc_dointvec,
1da177e4
LT		 1468 .extra1 = &zero,
1469 },
1470 {
1da177e4
LT		 1471 .procname = "vfs_cache_pressure",
1472 .data = &sysctl_vfs_cache_pressure,
1473 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1474 .mode = 0644,
6d456111 1475 .proc_handler = proc_dointvec,
1da177e4
LT		 1476 .extra1 = &zero,
1477 },
1478#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1479 {
1da177e4
LT		 1480 .procname = "legacy_va_layout",
1481 .data = &sysctl_legacy_va_layout,
1482 .maxlen = sizeof(sysctl_legacy_va_layout),
1483 .mode = 0644,
6d456111 1484 .proc_handler = proc_dointvec,
1da177e4
LT		 1485 .extra1 = &zero,
1486 },
1487#endif
1743660b
CL		 1488#ifdef CONFIG_NUMA
1489 {
1743660b
CL		 1490 .procname = "zone_reclaim_mode",
1491 .data = &zone_reclaim_mode,
1492 .maxlen = sizeof(zone_reclaim_mode),
1493 .mode = 0644,
6d456111 1494 .proc_handler = proc_dointvec,
c84db23c 1495 .extra1 = &zero,
1743660b 1496 },
9614634f 1497 {
9614634f
CL		 1498 .procname = "min_unmapped_ratio",
1499 .data = &sysctl_min_unmapped_ratio,
1500 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1501 .mode = 0644,
6d456111 1502 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1503 .extra1 = &zero,
1504 .extra2 = &one_hundred,
1505 },
0ff38490 1506 {
0ff38490
CL		 1507 .procname = "min_slab_ratio",
1508 .data = &sysctl_min_slab_ratio,
1509 .maxlen = sizeof(sysctl_min_slab_ratio),
1510 .mode = 0644,
6d456111 1511 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1512 .extra1 = &zero,
1513 .extra2 = &one_hundred,
1514 },
e6e5494c 1515#endif
77461ab3
CL		 1516#ifdef CONFIG_SMP
1517 {
77461ab3
CL		 1518 .procname = "stat_interval",
1519 .data = &sysctl_stat_interval,
1520 .maxlen = sizeof(sysctl_stat_interval),
1521 .mode = 0644,
6d456111 1522 .proc_handler = proc_dointvec_jiffies,
77461ab3 1523 },
52b6f46b
HD		 1524 {
1525 .procname = "stat_refresh",
1526 .data = NULL,
1527 .maxlen = 0,
1528 .mode = 0600,
1529 .proc_handler = vmstat_refresh,
1530 },
77461ab3 1531#endif
6e141546 1532#ifdef CONFIG_MMU
ed032189 1533 {
ed032189 1534 .procname = "mmap_min_addr",
788084ab
EP		 1535 .data = &dac_mmap_min_addr,
1536 .maxlen = sizeof(unsigned long),
ed032189 1537 .mode = 0644,
6d456111 1538 .proc_handler = mmap_min_addr_handler,
ed032189 1539 },
6e141546 1540#endif
f0c0b2b8
KH		 1541#ifdef CONFIG_NUMA
1542 {
f0c0b2b8
KH		 1543 .procname = "numa_zonelist_order",
1544 .data = &numa_zonelist_order,
1545 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1546 .mode = 0644,
6d456111 1547 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1548 },
1549#endif
2b8232ce 1550#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1551 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1552 {
e6e5494c 1553 .procname = "vdso_enabled",
3d7ee969
AL		 1554#ifdef CONFIG_X86_32
1555 .data = &vdso32_enabled,
1556 .maxlen = sizeof(vdso32_enabled),
1557#else
e6e5494c
IM		 1558 .data = &vdso_enabled,
1559 .maxlen = sizeof(vdso_enabled),
3d7ee969 1560#endif
e6e5494c 1561 .mode = 0644,
6d456111 1562 .proc_handler = proc_dointvec,
e6e5494c
IM		 1563 .extra1 = &zero,
1564 },
1da177e4 1565#endif
195cf453
BG		 1566#ifdef CONFIG_HIGHMEM
1567 {
195cf453
BG		 1568 .procname = "highmem_is_dirtyable",
1569 .data = &vm_highmem_is_dirtyable,
1570 .maxlen = sizeof(vm_highmem_is_dirtyable),
1571 .mode = 0644,
6d456111 1572 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1573 .extra1 = &zero,
1574 .extra2 = &one,
1575 },
1576#endif
6a46079c
AK		 1577#ifdef CONFIG_MEMORY_FAILURE
1578 {
6a46079c
AK		 1579 .procname = "memory_failure_early_kill",
1580 .data = &sysctl_memory_failure_early_kill,
1581 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1582 .mode = 0644,
6d456111 1583 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1584 .extra1 = &zero,
1585 .extra2 = &one,
1586 },
1587 {
6a46079c
AK		 1588 .procname = "memory_failure_recovery",
1589 .data = &sysctl_memory_failure_recovery,
1590 .maxlen = sizeof(sysctl_memory_failure_recovery),
1591 .mode = 0644,
6d456111 1592 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1593 .extra1 = &zero,
1594 .extra2 = &one,
1595 },
1596#endif
c9b1d098
AS		 1597 {
1598 .procname = "user_reserve_kbytes",
1599 .data = &sysctl_user_reserve_kbytes,
1600 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1601 .mode = 0644,
1602 .proc_handler = proc_doulongvec_minmax,
1603 },
4eeab4f5
AS		 1604 {
1605 .procname = "admin_reserve_kbytes",
1606 .data = &sysctl_admin_reserve_kbytes,
1607 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1608 .mode = 0644,
1609 .proc_handler = proc_doulongvec_minmax,
1610 },
d07e2259
DC		 1611#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1612 {
1613 .procname = "mmap_rnd_bits",
1614 .data = &mmap_rnd_bits,
1615 .maxlen = sizeof(mmap_rnd_bits),
1616 .mode = 0600,
1617 .proc_handler = proc_dointvec_minmax,
1618 .extra1 = (void *)&mmap_rnd_bits_min,
1619 .extra2 = (void *)&mmap_rnd_bits_max,
1620 },
1621#endif
1622#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1623 {
1624 .procname = "mmap_rnd_compat_bits",
1625 .data = &mmap_rnd_compat_bits,
1626 .maxlen = sizeof(mmap_rnd_compat_bits),
1627 .mode = 0600,
1628 .proc_handler = proc_dointvec_minmax,
1629 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1630 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1631 },
1632#endif
6fce56ec 1633 { }
1da177e4
LT		 1634};
1635
d8217f07 1636static struct ctl_table fs_table[] = {
1da177e4 1637 {
1da177e4
LT		 1638 .procname = "inode-nr",
1639 .data = &inodes_stat,
3942c07c 1640 .maxlen = 2*sizeof(long),
1da177e4 1641 .mode = 0444,
cffbc8aa 1642 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1643 },
1644 {
1da177e4
LT		 1645 .procname = "inode-state",
1646 .data = &inodes_stat,
3942c07c 1647 .maxlen = 7*sizeof(long),
1da177e4 1648 .mode = 0444,
cffbc8aa 1649 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1650 },
1651 {
1da177e4
LT		 1652 .procname = "file-nr",
1653 .data = &files_stat,
518de9b3 1654 .maxlen = sizeof(files_stat),
1da177e4 1655 .mode = 0444,
6d456111 1656 .proc_handler = proc_nr_files,
1da177e4
LT		 1657 },
1658 {
1da177e4
LT		 1659 .procname = "file-max",
1660 .data = &files_stat.max_files,
518de9b3 1661 .maxlen = sizeof(files_stat.max_files),
1da177e4 1662 .mode = 0644,
518de9b3 1663 .proc_handler = proc_doulongvec_minmax,
1da177e4 1664 },
9cfe015a 1665 {
9cfe015a
ED		 1666 .procname = "nr_open",
1667 .data = &sysctl_nr_open,
1668 .maxlen = sizeof(int),
1669 .mode = 0644,
6d456111 1670 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1671 .extra1 = &sysctl_nr_open_min,
1672 .extra2 = &sysctl_nr_open_max,
9cfe015a 1673 },
1da177e4 1674 {
1da177e4
LT		 1675 .procname = "dentry-state",
1676 .data = &dentry_stat,
3942c07c 1677 .maxlen = 6*sizeof(long),
1da177e4 1678 .mode = 0444,
312d3ca8 1679 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1680 },
1681 {
1da177e4
LT		 1682 .procname = "overflowuid",
1683 .data = &fs_overflowuid,
1684 .maxlen = sizeof(int),
1685 .mode = 0644,
6d456111 1686 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1687 .extra1 = &minolduid,
1688 .extra2 = &maxolduid,
1689 },
1690 {
1da177e4
LT		 1691 .procname = "overflowgid",
1692 .data = &fs_overflowgid,
1693 .maxlen = sizeof(int),
1694 .mode = 0644,
6d456111 1695 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1696 .extra1 = &minolduid,
1697 .extra2 = &maxolduid,
1698 },
bfcd17a6 1699#ifdef CONFIG_FILE_LOCKING
1da177e4 1700 {
1da177e4
LT		 1701 .procname = "leases-enable",
1702 .data = &leases_enable,
1703 .maxlen = sizeof(int),
1704 .mode = 0644,
6d456111 1705 .proc_handler = proc_dointvec,
1da177e4 1706 },
bfcd17a6 1707#endif
1da177e4
LT		 1708#ifdef CONFIG_DNOTIFY
1709 {
1da177e4
LT		 1710 .procname = "dir-notify-enable",
1711 .data = &dir_notify_enable,
1712 .maxlen = sizeof(int),
1713 .mode = 0644,
6d456111 1714 .proc_handler = proc_dointvec,
1da177e4
LT		 1715 },
1716#endif
1717#ifdef CONFIG_MMU
bfcd17a6 1718#ifdef CONFIG_FILE_LOCKING
1da177e4 1719 {
1da177e4
LT		 1720 .procname = "lease-break-time",
1721 .data = &lease_break_time,
1722 .maxlen = sizeof(int),
1723 .mode = 0644,
6d456111 1724 .proc_handler = proc_dointvec,
1da177e4 1725 },
bfcd17a6 1726#endif
ebf3f09c 1727#ifdef CONFIG_AIO
1da177e4 1728 {
1da177e4
LT		 1729 .procname = "aio-nr",
1730 .data = &aio_nr,
1731 .maxlen = sizeof(aio_nr),
1732 .mode = 0444,
6d456111 1733 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1734 },
1735 {
1da177e4
LT		 1736 .procname = "aio-max-nr",
1737 .data = &aio_max_nr,
1738 .maxlen = sizeof(aio_max_nr),
1739 .mode = 0644,
6d456111 1740 .proc_handler = proc_doulongvec_minmax,
1da177e4 1741 },
ebf3f09c 1742#endif /* CONFIG_AIO */
2d9048e2 1743#ifdef CONFIG_INOTIFY_USER
0399cb08 1744 {
0399cb08
RL		 1745 .procname = "inotify",
1746 .mode = 0555,
1747 .child = inotify_table,
1748 },
1749#endif
7ef9964e
DL		 1750#ifdef CONFIG_EPOLL
1751 {
1752 .procname = "epoll",
1753 .mode = 0555,
1754 .child = epoll_table,
1755 },
1756#endif
1da177e4 1757#endif
800179c9
KC		 1758 {
1759 .procname = "protected_symlinks",
1760 .data = &sysctl_protected_symlinks,
1761 .maxlen = sizeof(int),
1762 .mode = 0600,
1763 .proc_handler = proc_dointvec_minmax,
1764 .extra1 = &zero,
1765 .extra2 = &one,
1766 },
1767 {
1768 .procname = "protected_hardlinks",
1769 .data = &sysctl_protected_hardlinks,
1770 .maxlen = sizeof(int),
1771 .mode = 0600,
1772 .proc_handler = proc_dointvec_minmax,
1773 .extra1 = &zero,
1774 .extra2 = &one,
1775 },
d6e71144 1776 {
d6e71144
AC		 1777 .procname = "suid_dumpable",
1778 .data = &suid_dumpable,
1779 .maxlen = sizeof(int),
1780 .mode = 0644,
54b50199 1781 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1782 .extra1 = &zero,
1783 .extra2 = &two,
d6e71144 1784 },
2abc26fc
EB		 1785#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1786 {
2abc26fc
EB		 1787 .procname = "binfmt_misc",
1788 .mode = 0555,
f9bd6733 1789 .child = sysctl_mount_point,
2abc26fc
EB		 1790 },
1791#endif
b492e95b 1792 {
ff9da691
JA		 1793 .procname = "pipe-max-size",
1794 .data = &pipe_max_size,
b492e95b
JA		 1795 .maxlen = sizeof(int),
1796 .mode = 0644,
ff9da691
JA		 1797 .proc_handler = &pipe_proc_fn,
1798 .extra1 = &pipe_min_size,
b492e95b 1799 },
759c0114
WT		 1800 {
1801 .procname = "pipe-user-pages-hard",
1802 .data = &pipe_user_pages_hard,
1803 .maxlen = sizeof(pipe_user_pages_hard),
1804 .mode = 0644,
1805 .proc_handler = proc_doulongvec_minmax,
1806 },
1807 {
1808 .procname = "pipe-user-pages-soft",
1809 .data = &pipe_user_pages_soft,
1810 .maxlen = sizeof(pipe_user_pages_soft),
1811 .mode = 0644,
1812 .proc_handler = proc_doulongvec_minmax,
1813 },
6fce56ec 1814 { }
1da177e4
LT		 1815};
1816
d8217f07 1817static struct ctl_table debug_table[] = {
7ac57a89 1818#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1819 {
abd4f750
MAS		 1820 .procname = "exception-trace",
1821 .data = &show_unhandled_signals,
1822 .maxlen = sizeof(int),
1823 .mode = 0644,
1824 .proc_handler = proc_dointvec
1825 },
b2be84df
MH		 1826#endif
1827#if defined(CONFIG_OPTPROBES)
1828 {
1829 .procname = "kprobes-optimization",
1830 .data = &sysctl_kprobes_optimization,
1831 .maxlen = sizeof(int),
1832 .mode = 0644,
1833 .proc_handler = proc_kprobes_optimization_handler,
1834 .extra1 = &zero,
1835 .extra2 = &one,
1836 },
abd4f750 1837#endif
6fce56ec 1838 { }
1da177e4
LT		 1839};
1840
d8217f07 1841static struct ctl_table dev_table[] = {
6fce56ec 1842 { }
0eeca283 1843};
1da177e4 1844
de4e83bd 1845int __init sysctl_init(void)
d912b0cc 1846{
fd4b616b
SR		 1847 struct ctl_table_header *hdr;
1848
1849 hdr = register_sysctl_table(sysctl_base_table);
1850 kmemleak_not_leak(hdr);
d912b0cc
EB		 1851 return 0;
1852}
1853
b89a8171
EB		 1854#endif /* CONFIG_SYSCTL */
1855
1da177e4
LT		 1856/*
1857 * /proc/sys support
1858 */
1859
b89a8171 1860#ifdef CONFIG_PROC_SYSCTL
1da177e4 1861
f8808300
KC		 1862static int _proc_do_string(char *data, int maxlen, int write,
1863 char __user *buffer,
b1ba4ddd 1864 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1865{
1866 size_t len;
1867 char __user *p;
1868 char c;
8d060877
ON		 1869
1870 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1871 *lenp = 0;
1872 return 0;
1873 }
8d060877 1874
1da177e4 1875 if (write) {
f4aacea2
KC		 1876 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1877 /* Only continue writes not past the end of buffer. */
1878 len = strlen(data);
1879 if (len > maxlen - 1)
1880 len = maxlen - 1;
1881
1882 if (*ppos > len)
1883 return 0;
1884 len = *ppos;
1885 } else {
1886 /* Start writing from beginning of buffer. */
1887 len = 0;
1888 }
1889
2ca9bb45 1890 *ppos += *lenp;
1da177e4 1891 p = buffer;
2ca9bb45 1892 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1893 if (get_user(c, p++))
1894 return -EFAULT;
1895 if (c == 0 || c == '\n')
1896 break;
2ca9bb45 1897 data[len++] = c;
1da177e4 1898 }
f8808300 1899 data[len] = 0;
1da177e4 1900 } else {
f5dd3d6f
SV		 1901 len = strlen(data);
1902 if (len > maxlen)
1903 len = maxlen;
8d060877
ON		 1904
1905 if (*ppos > len) {
1906 *lenp = 0;
1907 return 0;
1908 }
1909
1910 data += *ppos;
1911 len -= *ppos;
1912
1da177e4
LT		 1913 if (len > *lenp)
1914 len = *lenp;
1915 if (len)
f8808300 1916 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1917 return -EFAULT;
1918 if (len < *lenp) {
f8808300 1919 if (put_user('\n', buffer + len))
1da177e4
LT		 1920 return -EFAULT;
1921 len++;
1922 }
1923 *lenp = len;
1924 *ppos += len;
1925 }
1926 return 0;
1927}
1928
f4aacea2
KC		 1929static void warn_sysctl_write(struct ctl_table *table)
1930{
1931 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1932 "This will not be supported in the future. To silence this\n"
1933 "warning, set kernel.sysctl_writes_strict = -1\n",
1934 current->comm, table->procname);
1935}
1936
f5dd3d6f
SV		 1937/**
1938 * proc_dostring - read a string sysctl
1939 * @table: the sysctl table
1940 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 1941 * @buffer: the user buffer
1942 * @lenp: the size of the user buffer
1943 * @ppos: file position
1944 *
1945 * Reads/writes a string from/to the user buffer. If the kernel
1946 * buffer provided is not large enough to hold the string, the
1947 * string is truncated. The copied string is %NULL-terminated.
1948 * If the string is being read by the user process, it is copied
1949 * and a newline '\n' is added. It is truncated if the buffer is
1950 * not large enough.
1951 *
1952 * Returns 0 on success.
1953 */
8d65af78 1954int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 1955 void __user *buffer, size_t *lenp, loff_t *ppos)
1956{
f4aacea2
KC		 1957 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1958 warn_sysctl_write(table);
1959
f8808300
KC		 1960 return _proc_do_string((char *)(table->data), table->maxlen, write,
1961 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 1962}
1963
00b7c339
AW		 1964static size_t proc_skip_spaces(char **buf)
1965{
1966 size_t ret;
1967 char *tmp = skip_spaces(*buf);
1968 ret = tmp - *buf;
1969 *buf = tmp;
1970 return ret;
1971}
1972
9f977fb7
OP		 1973static void proc_skip_char(char **buf, size_t *size, const char v)
1974{
1975 while (*size) {
1976 if (**buf != v)
1977 break;
1978 (*size)--;
1979 (*buf)++;
1980 }
1981}
1982
00b7c339
AW		 1983#define TMPBUFLEN 22
1984/**
0fc377bd 1985 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 1986 *
0fc377bd
RD		 1987 * @buf: a kernel buffer
1988 * @size: size of the kernel buffer
1989 * @val: this is where the number will be stored
1990 * @neg: set to %TRUE if number is negative
1991 * @perm_tr: a vector which contains the allowed trailers
1992 * @perm_tr_len: size of the perm_tr vector
1993 * @tr: pointer to store the trailer character
00b7c339 1994 *
0fc377bd
RD		 1995 * In case of success %0 is returned and @buf and @size are updated with
1996 * the amount of bytes read. If @tr is non-NULL and a trailing
1997 * character exists (size is non-zero after returning from this
1998 * function), @tr is updated with the trailing character.
00b7c339
AW		 1999 */
2000static int proc_get_long(char **buf, size_t *size,
2001 unsigned long *val, bool *neg,
2002 const char *perm_tr, unsigned perm_tr_len, char *tr)
2003{
2004 int len;
2005 char *p, tmp[TMPBUFLEN];
2006
2007 if (!*size)
2008 return -EINVAL;
2009
2010 len = *size;
2011 if (len > TMPBUFLEN - 1)
2012 len = TMPBUFLEN - 1;
2013
2014 memcpy(tmp, *buf, len);
2015
2016 tmp[len] = 0;
2017 p = tmp;
2018 if (*p == '-' && *size > 1) {
2019 *neg = true;
2020 p++;
2021 } else
2022 *neg = false;
2023 if (!isdigit(*p))
2024 return -EINVAL;
2025
2026 *val = simple_strtoul(p, &p, 0);
2027
2028 len = p - tmp;
2029
2030 /* We don't know if the next char is whitespace thus we may accept
2031 * invalid integers (e.g. 1234...a) or two integers instead of one
2032 * (e.g. 123...1). So lets not allow such large numbers. */
2033 if (len == TMPBUFLEN - 1)
2034 return -EINVAL;
2035
2036 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2037 return -EINVAL;
1da177e4 2038
00b7c339
AW		 2039 if (tr && (len < *size))
2040 *tr = *p;
2041
2042 *buf += len;
2043 *size -= len;
2044
2045 return 0;
2046}
2047
2048/**
0fc377bd 2049 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2050 *
0fc377bd
RD		 2051 * @buf: the user buffer
2052 * @size: the size of the user buffer
2053 * @val: the integer to be converted
2054 * @neg: sign of the number, %TRUE for negative
00b7c339 2055 *
0fc377bd
RD		 2056 * In case of success %0 is returned and @buf and @size are updated with
2057 * the amount of bytes written.
00b7c339
AW		 2058 */
2059static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2060 bool neg)
2061{
2062 int len;
2063 char tmp[TMPBUFLEN], *p = tmp;
2064
2065 sprintf(p, "%s%lu", neg ? "-" : "", val);
2066 len = strlen(tmp);
2067 if (len > *size)
2068 len = *size;
2069 if (copy_to_user(*buf, tmp, len))
2070 return -EFAULT;
2071 *size -= len;
2072 *buf += len;
2073 return 0;
2074}
2075#undef TMPBUFLEN
2076
2077static int proc_put_char(void __user **buf, size_t *size, char c)
2078{
2079 if (*size) {
2080 char __user **buffer = (char __user **)buf;
2081 if (put_user(c, *buffer))
2082 return -EFAULT;
2083 (*size)--, (*buffer)++;
2084 *buf = *buffer;
2085 }
2086 return 0;
2087}
1da177e4 2088
00b7c339 2089static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2090 int *valp,
2091 int write, void *data)
2092{
2093 if (write) {
230633d1
HS		 2094 if (*negp) {
2095 if (*lvalp > (unsigned long) INT_MAX + 1)
2096 return -EINVAL;
2097 *valp = -*lvalp;
2098 } else {
2099 if (*lvalp > (unsigned long) INT_MAX)
2100 return -EINVAL;
2101 *valp = *lvalp;
2102 }
1da177e4
LT		 2103 } else {
2104 int val = *valp;
2105 if (val < 0) {
00b7c339 2106 *negp = true;
9a5bc726 2107 *lvalp = -(unsigned long)val;
1da177e4 2108 } else {
00b7c339 2109 *negp = false;
1da177e4
LT		 2110 *lvalp = (unsigned long)val;
2111 }
2112 }
2113 return 0;
2114}
2115
00b7c339
AW		 2116static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2117
d8217f07 2118static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2119 int write, void __user *buffer,
fcfbd547 2120 size_t *lenp, loff_t *ppos,
00b7c339 2121 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2122 int write, void *data),
2123 void *data)
2124{
00b7c339 2125 int *i, vleft, first = 1, err = 0;
00b7c339 2126 size_t left;
70f6cbb6 2127 char *kbuf = NULL, *p;
1da177e4 2128
00b7c339 2129 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2130 *lenp = 0;
2131 return 0;
2132 }
2133
fcfbd547 2134 i = (int *) tbl_data;
1da177e4
LT		 2135 vleft = table->maxlen / sizeof(*i);
2136 left = *lenp;
2137
2138 if (!conv)
2139 conv = do_proc_dointvec_conv;
2140
00b7c339 2141 if (write) {
f4aacea2
KC		 2142 if (*ppos) {
2143 switch (sysctl_writes_strict) {
2144 case SYSCTL_WRITES_STRICT:
2145 goto out;
2146 case SYSCTL_WRITES_WARN:
2147 warn_sysctl_write(table);
2148 break;
2149 default:
2150 break;
2151 }
2152 }
2153
00b7c339
AW		 2154 if (left > PAGE_SIZE - 1)
2155 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2156 p = kbuf = memdup_user_nul(buffer, left);
2157 if (IS_ERR(kbuf))
2158 return PTR_ERR(kbuf);
00b7c339
AW		 2159 }
2160
1da177e4 2161 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2162 unsigned long lval;
2163 bool neg;
1da177e4 2164
00b7c339 2165 if (write) {
70f6cbb6 2166 left -= proc_skip_spaces(&p);
1da177e4 2167
563b0467
O		 2168 if (!left)
2169 break;
70f6cbb6 2170 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2171 proc_wspace_sep,
2172 sizeof(proc_wspace_sep), NULL);
2173 if (err)
1da177e4 2174 break;
00b7c339
AW		 2175 if (conv(&neg, &lval, i, 1, data)) {
2176 err = -EINVAL;
1da177e4 2177 break;
00b7c339 2178 }
1da177e4 2179 } else {
00b7c339
AW		 2180 if (conv(&neg, &lval, i, 0, data)) {
2181 err = -EINVAL;
2182 break;
2183 }
1da177e4 2184 if (!first)
00b7c339
AW		 2185 err = proc_put_char(&buffer, &left, '\t');
2186 if (err)
2187 break;
2188 err = proc_put_long(&buffer, &left, lval, neg);
2189 if (err)
1da177e4 2190 break;
1da177e4
LT		 2191 }
2192 }
2193
00b7c339
AW		 2194 if (!write && !first && left && !err)
2195 err = proc_put_char(&buffer, &left, '\n');
563b0467 2196 if (write && !err && left)
70f6cbb6 2197 left -= proc_skip_spaces(&p);
1da177e4 2198 if (write) {
70f6cbb6 2199 kfree(kbuf);
00b7c339
AW		 2200 if (first)
2201 return err ? : -EINVAL;
1da177e4 2202 }
1da177e4 2203 *lenp -= left;
f4aacea2 2204out:
1da177e4 2205 *ppos += *lenp;
00b7c339 2206 return err;
1da177e4
LT		 2207}
2208
8d65af78 2209static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2210 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2211 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2212 int write, void *data),
2213 void *data)
2214{
8d65af78 2215 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2216 buffer, lenp, ppos, conv, data);
2217}
2218
1da177e4
LT		 2219/**
2220 * proc_dointvec - read a vector of integers
2221 * @table: the sysctl table
2222 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2223 * @buffer: the user buffer
2224 * @lenp: the size of the user buffer
2225 * @ppos: file position
2226 *
2227 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2228 * values from/to the user buffer, treated as an ASCII string.
2229 *
2230 * Returns 0 on success.
2231 */
8d65af78 2232int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2233 void __user *buffer, size_t *lenp, loff_t *ppos)
2234{
8d65af78 2235 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2236 NULL,NULL);
2237}
2238
34f5a398 2239/*
25ddbb18
AK		 2240 * Taint values can only be increased
2241 * This means we can safely use a temporary.
34f5a398 2242 */
8d65af78 2243static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2244 void __user *buffer, size_t *lenp, loff_t *ppos)
2245{
25ddbb18
AK		 2246 struct ctl_table t;
2247 unsigned long tmptaint = get_taint();
2248 int err;
34f5a398 2249
91fcd412 2250 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2251 return -EPERM;
2252
25ddbb18
AK		 2253 t = *table;
2254 t.data = &tmptaint;
8d65af78 2255 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2256 if (err < 0)
2257 return err;
2258
2259 if (write) {
2260 /*
2261 * Poor man's atomic or. Not worth adding a primitive
2262 * to everyone's atomic.h for this
2263 */
2264 int i;
2265 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2266 if ((tmptaint >> i) & 1)
373d4d09 2267 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2268 }
2269 }
2270
2271 return err;
34f5a398
TT		 2272}
2273
bfdc0b49 2274#ifdef CONFIG_PRINTK
620f6e8e 2275static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2276 void __user *buffer, size_t *lenp, loff_t *ppos)
2277{
2278 if (write && !capable(CAP_SYS_ADMIN))
2279 return -EPERM;
2280
2281 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2282}
2283#endif
2284
1da177e4
LT		 2285struct do_proc_dointvec_minmax_conv_param {
2286 int *min;
2287 int *max;
2288};
2289
00b7c339
AW		 2290static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2291 int *valp,
1da177e4
LT		 2292 int write, void *data)
2293{
2294 struct do_proc_dointvec_minmax_conv_param *param = data;
2295 if (write) {
2296 int val = *negp ? -*lvalp : *lvalp;
2297 if ((param->min && *param->min > val) ||
2298 (param->max && *param->max < val))
2299 return -EINVAL;
2300 *valp = val;
2301 } else {
2302 int val = *valp;
2303 if (val < 0) {
00b7c339 2304 *negp = true;
9a5bc726 2305 *lvalp = -(unsigned long)val;
1da177e4 2306 } else {
00b7c339 2307 *negp = false;
1da177e4
LT		 2308 *lvalp = (unsigned long)val;
2309 }
2310 }
2311 return 0;
2312}
2313
2314/**
2315 * proc_dointvec_minmax - read a vector of integers with min/max values
2316 * @table: the sysctl table
2317 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2318 * @buffer: the user buffer
2319 * @lenp: the size of the user buffer
2320 * @ppos: file position
2321 *
2322 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2323 * values from/to the user buffer, treated as an ASCII string.
2324 *
2325 * This routine will ensure the values are within the range specified by
2326 * table->extra1 (min) and table->extra2 (max).
2327 *
2328 * Returns 0 on success.
2329 */
8d65af78 2330int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2331 void __user *buffer, size_t *lenp, loff_t *ppos)
2332{
2333 struct do_proc_dointvec_minmax_conv_param param = {
2334 .min = (int *) table->extra1,
2335 .max = (int *) table->extra2,
2336 };
8d65af78 2337 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2338 do_proc_dointvec_minmax_conv, &param);
2339}
2340
54b50199
KC		 2341static void validate_coredump_safety(void)
2342{
046d662f 2343#ifdef CONFIG_COREDUMP
e579d2c2 2344 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199
KC		 2345 core_pattern[0] != '/' && core_pattern[0] != '|') {
2346 printk(KERN_WARNING "Unsafe core_pattern used with "\
2347 "suid_dumpable=2. Pipe handler or fully qualified "\
2348 "core dump path required.\n");
2349 }
046d662f 2350#endif
54b50199
KC		 2351}
2352
2353static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2354 void __user *buffer, size_t *lenp, loff_t *ppos)
2355{
2356 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2357 if (!error)
2358 validate_coredump_safety();
2359 return error;
2360}
2361
046d662f 2362#ifdef CONFIG_COREDUMP
54b50199
KC		 2363static int proc_dostring_coredump(struct ctl_table *table, int write,
2364 void __user *buffer, size_t *lenp, loff_t *ppos)
2365{
2366 int error = proc_dostring(table, write, buffer, lenp, ppos);
2367 if (!error)
2368 validate_coredump_safety();
2369 return error;
2370}
046d662f 2371#endif
54b50199 2372
d8217f07 2373static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2374 void __user *buffer,
2375 size_t *lenp, loff_t *ppos,
2376 unsigned long convmul,
2377 unsigned long convdiv)
2378{
00b7c339
AW		 2379 unsigned long *i, *min, *max;
2380 int vleft, first = 1, err = 0;
00b7c339 2381 size_t left;
70f6cbb6 2382 char *kbuf = NULL, *p;
00b7c339
AW		 2383
2384 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2385 *lenp = 0;
2386 return 0;
2387 }
00b7c339 2388
fcfbd547 2389 i = (unsigned long *) data;
1da177e4
LT		 2390 min = (unsigned long *) table->extra1;
2391 max = (unsigned long *) table->extra2;
2392 vleft = table->maxlen / sizeof(unsigned long);
2393 left = *lenp;
00b7c339
AW		 2394
2395 if (write) {
f4aacea2
KC		 2396 if (*ppos) {
2397 switch (sysctl_writes_strict) {
2398 case SYSCTL_WRITES_STRICT:
2399 goto out;
2400 case SYSCTL_WRITES_WARN:
2401 warn_sysctl_write(table);
2402 break;
2403 default:
2404 break;
2405 }
2406 }
2407
00b7c339
AW		 2408 if (left > PAGE_SIZE - 1)
2409 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2410 p = kbuf = memdup_user_nul(buffer, left);
2411 if (IS_ERR(kbuf))
2412 return PTR_ERR(kbuf);
00b7c339
AW		 2413 }
2414
27b3d80a 2415 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2416 unsigned long val;
2417
1da177e4 2418 if (write) {
00b7c339
AW		 2419 bool neg;
2420
70f6cbb6 2421 left -= proc_skip_spaces(&p);
00b7c339 2422
70f6cbb6 2423 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2424 proc_wspace_sep,
2425 sizeof(proc_wspace_sep), NULL);
2426 if (err)
1da177e4
LT		 2427 break;
2428 if (neg)
1da177e4
LT		 2429 continue;
2430 if ((min && val < *min) || (max && val > *max))
2431 continue;
2432 *i = val;
2433 } else {
00b7c339 2434 val = convdiv * (*i) / convmul;
7833819d 2435 if (!first) {
00b7c339 2436 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2437 if (err)
2438 break;
2439 }
00b7c339
AW		 2440 err = proc_put_long(&buffer, &left, val, false);
2441 if (err)
2442 break;
1da177e4
LT		 2443 }
2444 }
2445
00b7c339
AW		 2446 if (!write && !first && left && !err)
2447 err = proc_put_char(&buffer, &left, '\n');
2448 if (write && !err)
70f6cbb6 2449 left -= proc_skip_spaces(&p);
1da177e4 2450 if (write) {
70f6cbb6 2451 kfree(kbuf);
00b7c339
AW		 2452 if (first)
2453 return err ? : -EINVAL;
1da177e4 2454 }
1da177e4 2455 *lenp -= left;
f4aacea2 2456out:
1da177e4 2457 *ppos += *lenp;
00b7c339 2458 return err;
1da177e4
LT		 2459}
2460
d8217f07 2461static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2462 void __user *buffer,
2463 size_t *lenp, loff_t *ppos,
2464 unsigned long convmul,
2465 unsigned long convdiv)
2466{
2467 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2468 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2469}
2470
1da177e4
LT		 2471/**
2472 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2473 * @table: the sysctl table
2474 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2475 * @buffer: the user buffer
2476 * @lenp: the size of the user buffer
2477 * @ppos: file position
2478 *
2479 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2480 * values from/to the user buffer, treated as an ASCII string.
2481 *
2482 * This routine will ensure the values are within the range specified by
2483 * table->extra1 (min) and table->extra2 (max).
2484 *
2485 * Returns 0 on success.
2486 */
8d65af78 2487int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2488 void __user *buffer, size_t *lenp, loff_t *ppos)
2489{
8d65af78 2490 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2491}
2492
2493/**
2494 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2495 * @table: the sysctl table
2496 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2497 * @buffer: the user buffer
2498 * @lenp: the size of the user buffer
2499 * @ppos: file position
2500 *
2501 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2502 * values from/to the user buffer, treated as an ASCII string. The values
2503 * are treated as milliseconds, and converted to jiffies when they are stored.
2504 *
2505 * This routine will ensure the values are within the range specified by
2506 * table->extra1 (min) and table->extra2 (max).
2507 *
2508 * Returns 0 on success.
2509 */
d8217f07 2510int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2511 void __user *buffer,
2512 size_t *lenp, loff_t *ppos)
2513{
8d65af78 2514 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2515 lenp, ppos, HZ, 1000l);
2516}
2517
2518
00b7c339 2519static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2520 int *valp,
2521 int write, void *data)
2522{
2523 if (write) {
cba9f33d
BS		 2524 if (*lvalp > LONG_MAX / HZ)
2525 return 1;
1da177e4
LT		 2526 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2527 } else {
2528 int val = *valp;
2529 unsigned long lval;
2530 if (val < 0) {
00b7c339 2531 *negp = true;
9a5bc726 2532 lval = -(unsigned long)val;
1da177e4 2533 } else {
00b7c339 2534 *negp = false;
1da177e4
LT		 2535 lval = (unsigned long)val;
2536 }
2537 *lvalp = lval / HZ;
2538 }
2539 return 0;
2540}
2541
00b7c339 2542static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2543 int *valp,
2544 int write, void *data)
2545{
2546 if (write) {
cba9f33d
BS		 2547 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2548 return 1;
1da177e4
LT		 2549 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2550 } else {
2551 int val = *valp;
2552 unsigned long lval;
2553 if (val < 0) {
00b7c339 2554 *negp = true;
9a5bc726 2555 lval = -(unsigned long)val;
1da177e4 2556 } else {
00b7c339 2557 *negp = false;
1da177e4
LT		 2558 lval = (unsigned long)val;
2559 }
2560 *lvalp = jiffies_to_clock_t(lval);
2561 }
2562 return 0;
2563}
2564
00b7c339 2565static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2566 int *valp,
2567 int write, void *data)
2568{
2569 if (write) {
d738ce8f
FF		 2570 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2571
2572 if (jif > INT_MAX)
2573 return 1;
2574 *valp = (int)jif;
1da177e4
LT		 2575 } else {
2576 int val = *valp;
2577 unsigned long lval;
2578 if (val < 0) {
00b7c339 2579 *negp = true;
9a5bc726 2580 lval = -(unsigned long)val;
1da177e4 2581 } else {
00b7c339 2582 *negp = false;
1da177e4
LT		 2583 lval = (unsigned long)val;
2584 }
2585 *lvalp = jiffies_to_msecs(lval);
2586 }
2587 return 0;
2588}
2589
2590/**
2591 * proc_dointvec_jiffies - read a vector of integers as seconds
2592 * @table: the sysctl table
2593 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2594 * @buffer: the user buffer
2595 * @lenp: the size of the user buffer
2596 * @ppos: file position
2597 *
2598 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2599 * values from/to the user buffer, treated as an ASCII string.
2600 * The values read are assumed to be in seconds, and are converted into
2601 * jiffies.
2602 *
2603 * Returns 0 on success.
2604 */
8d65af78 2605int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2606 void __user *buffer, size_t *lenp, loff_t *ppos)
2607{
8d65af78 2608 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2609 do_proc_dointvec_jiffies_conv,NULL);
2610}
2611
2612/**
2613 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2614 * @table: the sysctl table
2615 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2616 * @buffer: the user buffer
2617 * @lenp: the size of the user buffer
1e5d5331 2618 * @ppos: pointer to the file position
1da177e4
LT		 2619 *
2620 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2621 * values from/to the user buffer, treated as an ASCII string.
2622 * The values read are assumed to be in 1/USER_HZ seconds, and
2623 * are converted into jiffies.
2624 *
2625 * Returns 0 on success.
2626 */
8d65af78 2627int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2628 void __user *buffer, size_t *lenp, loff_t *ppos)
2629{
8d65af78 2630 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2631 do_proc_dointvec_userhz_jiffies_conv,NULL);
2632}
2633
2634/**
2635 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2636 * @table: the sysctl table
2637 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2638 * @buffer: the user buffer
2639 * @lenp: the size of the user buffer
67be2dd1
MW		 2640 * @ppos: file position
2641 * @ppos: the current position in the file
1da177e4
LT		 2642 *
2643 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2644 * values from/to the user buffer, treated as an ASCII string.
2645 * The values read are assumed to be in 1/1000 seconds, and
2646 * are converted into jiffies.
2647 *
2648 * Returns 0 on success.
2649 */
8d65af78 2650int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2651 void __user *buffer, size_t *lenp, loff_t *ppos)
2652{
8d65af78 2653 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2654 do_proc_dointvec_ms_jiffies_conv, NULL);
2655}
2656
8d65af78 2657static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2658 void __user *buffer, size_t *lenp, loff_t *ppos)
2659{
2660 struct pid *new_pid;
2661 pid_t tmp;
2662 int r;
2663
6c5f3e7b 2664 tmp = pid_vnr(cad_pid);
9ec52099 2665
8d65af78 2666 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2667 lenp, ppos, NULL, NULL);
2668 if (r || !write)
2669 return r;
2670
2671 new_pid = find_get_pid(tmp);
2672 if (!new_pid)
2673 return -ESRCH;
2674
2675 put_pid(xchg(&cad_pid, new_pid));
2676 return 0;
2677}
2678
9f977fb7
OP		 2679/**
2680 * proc_do_large_bitmap - read/write from/to a large bitmap
2681 * @table: the sysctl table
2682 * @write: %TRUE if this is a write to the sysctl file
2683 * @buffer: the user buffer
2684 * @lenp: the size of the user buffer
2685 * @ppos: file position
2686 *
2687 * The bitmap is stored at table->data and the bitmap length (in bits)
2688 * in table->maxlen.
2689 *
2690 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2691 * large bitmaps may be represented in a compact manner. Writing into
2692 * the file will clear the bitmap then update it with the given input.
2693 *
2694 * Returns 0 on success.
2695 */
2696int proc_do_large_bitmap(struct ctl_table *table, int write,
2697 void __user *buffer, size_t *lenp, loff_t *ppos)
2698{
2699 int err = 0;
2700 bool first = 1;
2701 size_t left = *lenp;
2702 unsigned long bitmap_len = table->maxlen;
122ff243 2703 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2704 unsigned long *tmp_bitmap = NULL;
2705 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2706
122ff243 2707 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2708 *lenp = 0;
2709 return 0;
2710 }
2711
2712 if (write) {
70f6cbb6 2713 char *kbuf, *p;
9f977fb7
OP		 2714
2715 if (left > PAGE_SIZE - 1)
2716 left = PAGE_SIZE - 1;
2717
70f6cbb6
AV		 2718 p = kbuf = memdup_user_nul(buffer, left);
2719 if (IS_ERR(kbuf))
2720 return PTR_ERR(kbuf);
9f977fb7
OP		 2721
2722 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2723 GFP_KERNEL);
2724 if (!tmp_bitmap) {
70f6cbb6 2725 kfree(kbuf);
9f977fb7
OP		 2726 return -ENOMEM;
2727 }
70f6cbb6 2728 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 2729 while (!err && left) {
2730 unsigned long val_a, val_b;
2731 bool neg;
2732
70f6cbb6 2733 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 2734 sizeof(tr_a), &c);
2735 if (err)
2736 break;
2737 if (val_a >= bitmap_len || neg) {
2738 err = -EINVAL;
2739 break;
2740 }
2741
2742 val_b = val_a;
2743 if (left) {
70f6cbb6 2744 p++;
9f977fb7
OP		 2745 left--;
2746 }
2747
2748 if (c == '-') {
70f6cbb6 2749 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 2750 &neg, tr_b, sizeof(tr_b),
2751 &c);
2752 if (err)
2753 break;
2754 if (val_b >= bitmap_len || neg ||
2755 val_a > val_b) {
2756 err = -EINVAL;
2757 break;
2758 }
2759 if (left) {
70f6cbb6 2760 p++;
9f977fb7
OP		 2761 left--;
2762 }
2763 }
2764
5a04cca6 2765 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 2766 first = 0;
70f6cbb6 2767 proc_skip_char(&p, &left, '\n');
9f977fb7 2768 }
70f6cbb6 2769 kfree(kbuf);
9f977fb7
OP		 2770 } else {
2771 unsigned long bit_a, bit_b = 0;
2772
2773 while (left) {
2774 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2775 if (bit_a >= bitmap_len)
2776 break;
2777 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2778 bit_a + 1) - 1;
2779
2780 if (!first) {
2781 err = proc_put_char(&buffer, &left, ',');
2782 if (err)
2783 break;
2784 }
2785 err = proc_put_long(&buffer, &left, bit_a, false);
2786 if (err)
2787 break;
2788 if (bit_a != bit_b) {
2789 err = proc_put_char(&buffer, &left, '-');
2790 if (err)
2791 break;
2792 err = proc_put_long(&buffer, &left, bit_b, false);
2793 if (err)
2794 break;
2795 }
2796
2797 first = 0; bit_b++;
2798 }
2799 if (!err)
2800 err = proc_put_char(&buffer, &left, '\n');
2801 }
2802
2803 if (!err) {
2804 if (write) {
2805 if (*ppos)
2806 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2807 else
5a04cca6 2808 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 2809 }
2810 kfree(tmp_bitmap);
2811 *lenp -= left;
2812 *ppos += *lenp;
2813 return 0;
2814 } else {
2815 kfree(tmp_bitmap);
2816 return err;
2817 }
2818}
2819
55610500 2820#else /* CONFIG_PROC_SYSCTL */
1da177e4 2821
8d65af78 2822int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2823 void __user *buffer, size_t *lenp, loff_t *ppos)
2824{
2825 return -ENOSYS;
2826}
2827
8d65af78 2828int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2829 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2830{
2831 return -ENOSYS;
2832}
2833
8d65af78 2834int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2835 void __user *buffer, size_t *lenp, loff_t *ppos)
2836{
2837 return -ENOSYS;
2838}
2839
8d65af78 2840int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2841 void __user *buffer, size_t *lenp, loff_t *ppos)
2842{
2843 return -ENOSYS;
2844}
2845
8d65af78 2846int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2847 void __user *buffer, size_t *lenp, loff_t *ppos)
2848{
2849 return -ENOSYS;
2850}
2851
8d65af78 2852int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2853 void __user *buffer, size_t *lenp, loff_t *ppos)
2854{
2855 return -ENOSYS;
2856}
2857
8d65af78 2858int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2859 void __user *buffer, size_t *lenp, loff_t *ppos)
2860{
2861 return -ENOSYS;
2862}
2863
d8217f07 2864int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2865 void __user *buffer,
2866 size_t *lenp, loff_t *ppos)
2867{
2868 return -ENOSYS;
2869}
2870
2871
55610500 2872#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2873
1da177e4
LT		 2874/*
2875 * No sense putting this after each symbol definition, twice,
2876 * exception granted :-)
2877 */
2878EXPORT_SYMBOL(proc_dointvec);
2879EXPORT_SYMBOL(proc_dointvec_jiffies);
2880EXPORT_SYMBOL(proc_dointvec_minmax);
2881EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2882EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2883EXPORT_SYMBOL(proc_dostring);
2884EXPORT_SYMBOL(proc_doulongvec_minmax);
2885EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux 6.x block layer and io_uring tree(s)