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Merge tag 'pci-v4.10-fixes-4' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaa...
[mirror_ubuntu-zesty-kernel.git] / kernel / sysctl.c
CommitLineData
1da177e4
LT		 1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
1da177e4 21#include <linux/module.h>
e2e40f2c 22#include <linux/aio.h>
1da177e4
LT		 23#include <linux/mm.h>
24#include <linux/swap.h>
25#include <linux/slab.h>
26#include <linux/sysctl.h>
5a04cca6 27#include <linux/bitmap.h>
d33ed52d 28#include <linux/signal.h>
455cd5ab 29#include <linux/printk.h>
1da177e4 30#include <linux/proc_fs.h>
72c2d582 31#include <linux/security.h>
1da177e4 32#include <linux/ctype.h>
dfec072e 33#include <linux/kmemcheck.h>
fd4b616b 34#include <linux/kmemleak.h>
62239ac2 35#include <linux/fs.h>
1da177e4
LT		 36#include <linux/init.h>
37#include <linux/kernel.h>
0296b228 38#include <linux/kobject.h>
20380731 39#include <linux/net.h>
1da177e4
LT		 40#include <linux/sysrq.h>
41#include <linux/highuid.h>
42#include <linux/writeback.h>
3fff4c42 43#include <linux/ratelimit.h>
76ab0f53 44#include <linux/compaction.h>
1da177e4 45#include <linux/hugetlb.h>
1da177e4 46#include <linux/initrd.h>
0b77f5bf 47#include <linux/key.h>
1da177e4
LT		 48#include <linux/times.h>
49#include <linux/limits.h>
50#include <linux/dcache.h>
6e006701 51#include <linux/dnotify.h>
1da177e4 52#include <linux/syscalls.h>
c748e134 53#include <linux/vmstat.h>
c255d844
PM		 54#include <linux/nfs_fs.h>
55#include <linux/acpi.h>
10a0a8d4 56#include <linux/reboot.h>
b0fc494f 57#include <linux/ftrace.h>
cdd6c482 58#include <linux/perf_event.h>
b2be84df 59#include <linux/kprobes.h>
b492e95b 60#include <linux/pipe_fs_i.h>
8e4228e1 61#include <linux/oom.h>
17f60a7d 62#include <linux/kmod.h>
73efc039 63#include <linux/capability.h>
40401530 64#include <linux/binfmts.h>
cf4aebc2 65#include <linux/sched/sysctl.h>
7984754b 66#include <linux/kexec.h>
1be7f75d 67#include <linux/bpf.h>
d2921684 68#include <linux/mount.h>
1da177e4 69
7c0f6ba6 70#include <linux/uaccess.h>
1da177e4
LT		 71#include <asm/processor.h>
72
29cbc78b
AK		 73#ifdef CONFIG_X86
74#include <asm/nmi.h>
0741f4d2 75#include <asm/stacktrace.h>
6e7c4025 76#include <asm/io.h>
29cbc78b 77#endif
d550bbd4
DH		 78#ifdef CONFIG_SPARC
79#include <asm/setup.h>
80#endif
c55b7c3e
DY		 81#ifdef CONFIG_BSD_PROCESS_ACCT
82#include <linux/acct.h>
83#endif
4f0e056f
DY		 84#ifdef CONFIG_RT_MUTEXES
85#include <linux/rtmutex.h>
86#endif
2edf5e49
DY		 87#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88#include <linux/lockdep.h>
89#endif
15485a46
DY		 90#ifdef CONFIG_CHR_DEV_SG
91#include <scsi/sg.h>
92#endif
29cbc78b 93
58687acb 94#ifdef CONFIG_LOCKUP_DETECTOR
504d7cf1
DZ		 95#include <linux/nmi.h>
96#endif
97
1da177e4
LT		 98#if defined(CONFIG_SYSCTL)
99
100/* External variables not in a header file. */
d6e71144 101extern int suid_dumpable;
046d662f
AK		 102#ifdef CONFIG_COREDUMP
103extern int core_uses_pid;
1da177e4 104extern char core_pattern[];
a293980c 105extern unsigned int core_pipe_limit;
046d662f 106#endif
1da177e4 107extern int pid_max;
1da177e4 108extern int pid_max_min, pid_max_max;
8ad4b1fb 109extern int percpu_pagelist_fraction;
9745512c 110extern int latencytop_enabled;
9b80a184 111extern unsigned 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 },
cb251765
MG		 350#ifdef CONFIG_SCHEDSTATS
351 {
352 .procname = "sched_schedstats",
353 .data = NULL,
354 .maxlen = sizeof(unsigned int),
355 .mode = 0644,
356 .proc_handler = sysctl_schedstats,
357 .extra1 = &zero,
358 .extra2 = &one,
359 },
360#endif /* CONFIG_SCHEDSTATS */
cbee9f88
PZ		 361#endif /* CONFIG_SMP */
362#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 363 {
364 .procname = "numa_balancing_scan_delay_ms",
365 .data = &sysctl_numa_balancing_scan_delay,
366 .maxlen = sizeof(unsigned int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec,
369 },
cbee9f88
PZ		 370 {
371 .procname = "numa_balancing_scan_period_min_ms",
372 .data = &sysctl_numa_balancing_scan_period_min,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
377 {
378 .procname = "numa_balancing_scan_period_max_ms",
379 .data = &sysctl_numa_balancing_scan_period_max,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
6e5fb223
PZ		 384 {
385 .procname = "numa_balancing_scan_size_mb",
386 .data = &sysctl_numa_balancing_scan_size,
387 .maxlen = sizeof(unsigned int),
388 .mode = 0644,
64192658
KT		 389 .proc_handler = proc_dointvec_minmax,
390 .extra1 = &one,
6e5fb223 391 },
54a43d54
AK		 392 {
393 .procname = "numa_balancing",
394 .data = NULL, /* filled in by handler */
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
397 .proc_handler = sysctl_numa_balancing,
398 .extra1 = &zero,
399 .extra2 = &one,
400 },
cbee9f88
PZ		 401#endif /* CONFIG_NUMA_BALANCING */
402#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 403 {
9f0c1e56
PZ		 404 .procname = "sched_rt_period_us",
405 .data = &sysctl_sched_rt_period,
406 .maxlen = sizeof(unsigned int),
407 .mode = 0644,
6d456111 408 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 409 },
410 {
9f0c1e56
PZ		 411 .procname = "sched_rt_runtime_us",
412 .data = &sysctl_sched_rt_runtime,
413 .maxlen = sizeof(int),
414 .mode = 0644,
6d456111 415 .proc_handler = sched_rt_handler,
9f0c1e56 416 },
ce0dbbbb
CW		 417 {
418 .procname = "sched_rr_timeslice_ms",
419 .data = &sched_rr_timeslice,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = sched_rr_handler,
423 },
5091faa4
MG		 424#ifdef CONFIG_SCHED_AUTOGROUP
425 {
426 .procname = "sched_autogroup_enabled",
427 .data = &sysctl_sched_autogroup_enabled,
428 .maxlen = sizeof(unsigned int),
429 .mode = 0644,
1747b21f 430 .proc_handler = proc_dointvec_minmax,
5091faa4
MG		 431 .extra1 = &zero,
432 .extra2 = &one,
433 },
434#endif
ec12cb7f
PT		 435#ifdef CONFIG_CFS_BANDWIDTH
436 {
437 .procname = "sched_cfs_bandwidth_slice_us",
438 .data = &sysctl_sched_cfs_bandwidth_slice,
439 .maxlen = sizeof(unsigned int),
440 .mode = 0644,
441 .proc_handler = proc_dointvec_minmax,
442 .extra1 = &one,
443 },
444#endif
f20786ff
PZ		 445#ifdef CONFIG_PROVE_LOCKING
446 {
f20786ff
PZ		 447 .procname = "prove_locking",
448 .data = &prove_locking,
449 .maxlen = sizeof(int),
450 .mode = 0644,
6d456111 451 .proc_handler = proc_dointvec,
f20786ff
PZ		 452 },
453#endif
454#ifdef CONFIG_LOCK_STAT
455 {
f20786ff
PZ		 456 .procname = "lock_stat",
457 .data = &lock_stat,
458 .maxlen = sizeof(int),
459 .mode = 0644,
6d456111 460 .proc_handler = proc_dointvec,
f20786ff 461 },
77e54a1f 462#endif
1da177e4 463 {
1da177e4
LT		 464 .procname = "panic",
465 .data = &panic_timeout,
466 .maxlen = sizeof(int),
467 .mode = 0644,
6d456111 468 .proc_handler = proc_dointvec,
1da177e4 469 },
046d662f 470#ifdef CONFIG_COREDUMP
1da177e4 471 {
1da177e4
LT		 472 .procname = "core_uses_pid",
473 .data = &core_uses_pid,
474 .maxlen = sizeof(int),
475 .mode = 0644,
6d456111 476 .proc_handler = proc_dointvec,
1da177e4
LT		 477 },
478 {
1da177e4
LT		 479 .procname = "core_pattern",
480 .data = core_pattern,
71ce92f3 481 .maxlen = CORENAME_MAX_SIZE,
1da177e4 482 .mode = 0644,
54b50199 483 .proc_handler = proc_dostring_coredump,
1da177e4 484 },
a293980c 485 {
a293980c
NH		 486 .procname = "core_pipe_limit",
487 .data = &core_pipe_limit,
488 .maxlen = sizeof(unsigned int),
489 .mode = 0644,
6d456111 490 .proc_handler = proc_dointvec,
a293980c 491 },
046d662f 492#endif
34f5a398 493#ifdef CONFIG_PROC_SYSCTL
1da177e4 494 {
1da177e4 495 .procname = "tainted",
25ddbb18 496 .maxlen = sizeof(long),
34f5a398 497 .mode = 0644,
6d456111 498 .proc_handler = proc_taint,
1da177e4 499 },
f4aacea2
KC		 500 {
501 .procname = "sysctl_writes_strict",
502 .data = &sysctl_writes_strict,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec_minmax,
506 .extra1 = &neg_one,
507 .extra2 = &one,
508 },
34f5a398 509#endif
9745512c
AV		 510#ifdef CONFIG_LATENCYTOP
511 {
512 .procname = "latencytop",
513 .data = &latencytop_enabled,
514 .maxlen = sizeof(int),
515 .mode = 0644,
cb251765 516 .proc_handler = sysctl_latencytop,
9745512c
AV		 517 },
518#endif
1da177e4
LT		 519#ifdef CONFIG_BLK_DEV_INITRD
520 {
1da177e4
LT		 521 .procname = "real-root-dev",
522 .data = &real_root_dev,
523 .maxlen = sizeof(int),
524 .mode = 0644,
6d456111 525 .proc_handler = proc_dointvec,
1da177e4
LT		 526 },
527#endif
45807a1d 528 {
45807a1d
IM		 529 .procname = "print-fatal-signals",
530 .data = &print_fatal_signals,
531 .maxlen = sizeof(int),
532 .mode = 0644,
6d456111 533 .proc_handler = proc_dointvec,
45807a1d 534 },
72c57ed5 535#ifdef CONFIG_SPARC
1da177e4 536 {
1da177e4
LT		 537 .procname = "reboot-cmd",
538 .data = reboot_command,
539 .maxlen = 256,
540 .mode = 0644,
6d456111 541 .proc_handler = proc_dostring,
1da177e4
LT		 542 },
543 {
1da177e4
LT		 544 .procname = "stop-a",
545 .data = &stop_a_enabled,
546 .maxlen = sizeof (int),
547 .mode = 0644,
6d456111 548 .proc_handler = proc_dointvec,
1da177e4
LT		 549 },
550 {
1da177e4
LT		 551 .procname = "scons-poweroff",
552 .data = &scons_pwroff,
553 .maxlen = sizeof (int),
554 .mode = 0644,
6d456111 555 .proc_handler = proc_dointvec,
1da177e4
LT		 556 },
557#endif
0871420f
DM		 558#ifdef CONFIG_SPARC64
559 {
0871420f
DM		 560 .procname = "tsb-ratio",
561 .data = &sysctl_tsb_ratio,
562 .maxlen = sizeof (int),
563 .mode = 0644,
6d456111 564 .proc_handler = proc_dointvec,
0871420f
DM		 565 },
566#endif
1da177e4
LT		 567#ifdef __hppa__
568 {
1da177e4
LT		 569 .procname = "soft-power",
570 .data = &pwrsw_enabled,
571 .maxlen = sizeof (int),
572 .mode = 0644,
6d456111 573 .proc_handler = proc_dointvec,
1da177e4 574 },
bf14e3b9
VG		 575#endif
576#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 577 {
1da177e4
LT		 578 .procname = "unaligned-trap",
579 .data = &unaligned_enabled,
580 .maxlen = sizeof (int),
581 .mode = 0644,
6d456111 582 .proc_handler = proc_dointvec,
1da177e4
LT		 583 },
584#endif
585 {
1da177e4
LT		 586 .procname = "ctrl-alt-del",
587 .data = &C_A_D,
588 .maxlen = sizeof(int),
589 .mode = 0644,
6d456111 590 .proc_handler = proc_dointvec,
1da177e4 591 },
606576ce 592#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 593 {
b0fc494f
SR		 594 .procname = "ftrace_enabled",
595 .data = &ftrace_enabled,
596 .maxlen = sizeof(int),
597 .mode = 0644,
6d456111 598 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 599 },
600#endif
f38f1d2a
SR		 601#ifdef CONFIG_STACK_TRACER
602 {
f38f1d2a
SR		 603 .procname = "stack_tracer_enabled",
604 .data = &stack_tracer_enabled,
605 .maxlen = sizeof(int),
606 .mode = 0644,
6d456111 607 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 608 },
609#endif
944ac425
SR		 610#ifdef CONFIG_TRACING
611 {
3299b4dd 612 .procname = "ftrace_dump_on_oops",
944ac425
SR		 613 .data = &ftrace_dump_on_oops,
614 .maxlen = sizeof(int),
615 .mode = 0644,
6d456111 616 .proc_handler = proc_dointvec,
944ac425 617 },
de7edd31
SRRH		 618 {
619 .procname = "traceoff_on_warning",
620 .data = &__disable_trace_on_warning,
621 .maxlen = sizeof(__disable_trace_on_warning),
622 .mode = 0644,
623 .proc_handler = proc_dointvec,
624 },
0daa2302
SRRH		 625 {
626 .procname = "tracepoint_printk",
627 .data = &tracepoint_printk,
628 .maxlen = sizeof(tracepoint_printk),
629 .mode = 0644,
42391745 630 .proc_handler = tracepoint_printk_sysctl,
0daa2302 631 },
944ac425 632#endif
2965faa5 633#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 634 {
635 .procname = "kexec_load_disabled",
636 .data = &kexec_load_disabled,
637 .maxlen = sizeof(int),
638 .mode = 0644,
639 /* only handle a transition from default "0" to "1" */
640 .proc_handler = proc_dointvec_minmax,
641 .extra1 = &one,
642 .extra2 = &one,
643 },
644#endif
a1ef5adb 645#ifdef CONFIG_MODULES
1da177e4 646 {
1da177e4
LT		 647 .procname = "modprobe",
648 .data = &modprobe_path,
649 .maxlen = KMOD_PATH_LEN,
650 .mode = 0644,
6d456111 651 .proc_handler = proc_dostring,
1da177e4 652 },
3d43321b 653 {
3d43321b
KC		 654 .procname = "modules_disabled",
655 .data = &modules_disabled,
656 .maxlen = sizeof(int),
657 .mode = 0644,
658 /* only handle a transition from default "0" to "1" */
6d456111 659 .proc_handler = proc_dointvec_minmax,
3d43321b
KC		 660 .extra1 = &one,
661 .extra2 = &one,
662 },
1da177e4 663#endif
86d56134 664#ifdef CONFIG_UEVENT_HELPER
1da177e4 665 {
1da177e4 666 .procname = "hotplug",
312c004d
KS		 667 .data = &uevent_helper,
668 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 669 .mode = 0644,
6d456111 670 .proc_handler = proc_dostring,
1da177e4 671 },
86d56134 672#endif
1da177e4
LT		 673#ifdef CONFIG_CHR_DEV_SG
674 {
1da177e4
LT		 675 .procname = "sg-big-buff",
676 .data = &sg_big_buff,
677 .maxlen = sizeof (int),
678 .mode = 0444,
6d456111 679 .proc_handler = proc_dointvec,
1da177e4
LT		 680 },
681#endif
682#ifdef CONFIG_BSD_PROCESS_ACCT
683 {
1da177e4
LT		 684 .procname = "acct",
685 .data = &acct_parm,
686 .maxlen = 3*sizeof(int),
687 .mode = 0644,
6d456111 688 .proc_handler = proc_dointvec,
1da177e4
LT		 689 },
690#endif
1da177e4
LT		 691#ifdef CONFIG_MAGIC_SYSRQ
692 {
1da177e4 693 .procname = "sysrq",
5d6f647f 694 .data = &__sysrq_enabled,
1da177e4
LT		 695 .maxlen = sizeof (int),
696 .mode = 0644,
97f5f0cd 697 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 698 },
699#endif
d6f8ff73 700#ifdef CONFIG_PROC_SYSCTL
1da177e4 701 {
1da177e4 702 .procname = "cad_pid",
9ec52099 703 .data = NULL,
1da177e4
LT		 704 .maxlen = sizeof (int),
705 .mode = 0600,
6d456111 706 .proc_handler = proc_do_cad_pid,
1da177e4 707 },
d6f8ff73 708#endif
1da177e4 709 {
1da177e4 710 .procname = "threads-max",
16db3d3f 711 .data = NULL,
1da177e4
LT		 712 .maxlen = sizeof(int),
713 .mode = 0644,
16db3d3f 714 .proc_handler = sysctl_max_threads,
1da177e4
LT		 715 },
716 {
1da177e4
LT		 717 .procname = "random",
718 .mode = 0555,
719 .child = random_table,
720 },
17f60a7d
EP		 721 {
722 .procname = "usermodehelper",
723 .mode = 0555,
724 .child = usermodehelper_table,
725 },
1da177e4 726 {
1da177e4
LT		 727 .procname = "overflowuid",
728 .data = &overflowuid,
729 .maxlen = sizeof(int),
730 .mode = 0644,
6d456111 731 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 732 .extra1 = &minolduid,
733 .extra2 = &maxolduid,
734 },
735 {
1da177e4
LT		 736 .procname = "overflowgid",
737 .data = &overflowgid,
738 .maxlen = sizeof(int),
739 .mode = 0644,
6d456111 740 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 741 .extra1 = &minolduid,
742 .extra2 = &maxolduid,
743 },
347a8dc3 744#ifdef CONFIG_S390
1da177e4
LT		 745#ifdef CONFIG_MATHEMU
746 {
1da177e4
LT		 747 .procname = "ieee_emulation_warnings",
748 .data = &sysctl_ieee_emulation_warnings,
749 .maxlen = sizeof(int),
750 .mode = 0644,
6d456111 751 .proc_handler = proc_dointvec,
1da177e4 752 },
1da177e4
LT		 753#endif
754 {
1da177e4 755 .procname = "userprocess_debug",
ab3c68ee 756 .data = &show_unhandled_signals,
1da177e4
LT		 757 .maxlen = sizeof(int),
758 .mode = 0644,
6d456111 759 .proc_handler = proc_dointvec,
1da177e4
LT		 760 },
761#endif
762 {
1da177e4
LT		 763 .procname = "pid_max",
764 .data = &pid_max,
765 .maxlen = sizeof (int),
766 .mode = 0644,
6d456111 767 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 768 .extra1 = &pid_max_min,
769 .extra2 = &pid_max_max,
770 },
771 {
1da177e4
LT		 772 .procname = "panic_on_oops",
773 .data = &panic_on_oops,
774 .maxlen = sizeof(int),
775 .mode = 0644,
6d456111 776 .proc_handler = proc_dointvec,
1da177e4 777 },
7ef3d2fd
JP		 778#if defined CONFIG_PRINTK
779 {
7ef3d2fd
JP		 780 .procname = "printk",
781 .data = &console_loglevel,
782 .maxlen = 4*sizeof(int),
783 .mode = 0644,
6d456111 784 .proc_handler = proc_dointvec,
7ef3d2fd 785 },
1da177e4 786 {
1da177e4 787 .procname = "printk_ratelimit",
717115e1 788 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 789 .maxlen = sizeof(int),
790 .mode = 0644,
6d456111 791 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 792 },
793 {
1da177e4 794 .procname = "printk_ratelimit_burst",
717115e1 795 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 796 .maxlen = sizeof(int),
797 .mode = 0644,
6d456111 798 .proc_handler = proc_dointvec,
1da177e4 799 },
af91322e 800 {
af91322e
DY		 801 .procname = "printk_delay",
802 .data = &printk_delay_msec,
803 .maxlen = sizeof(int),
804 .mode = 0644,
6d456111 805 .proc_handler = proc_dointvec_minmax,
af91322e
DY		 806 .extra1 = &zero,
807 .extra2 = &ten_thousand,
808 },
750afe7b
BP		 809 {
810 .procname = "printk_devkmsg",
811 .data = devkmsg_log_str,
812 .maxlen = DEVKMSG_STR_MAX_SIZE,
813 .mode = 0644,
814 .proc_handler = devkmsg_sysctl_set_loglvl,
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 },
6e7c4025 985 {
6e7c4025
IM		 986 .procname = "io_delay_type",
987 .data = &io_delay_type,
988 .maxlen = sizeof(int),
989 .mode = 0644,
6d456111 990 .proc_handler = proc_dointvec,
6e7c4025 991 },
1da177e4 992#endif
7a9166e3 993#if defined(CONFIG_MMU)
1da177e4 994 {
1da177e4
LT		 995 .procname = "randomize_va_space",
996 .data = &randomize_va_space,
997 .maxlen = sizeof(int),
998 .mode = 0644,
6d456111 999 .proc_handler = proc_dointvec,
1da177e4 1000 },
7a9166e3 1001#endif
0152fb37 1002#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1003 {
951f22d5
MS		 1004 .procname = "spin_retry",
1005 .data = &spin_retry,
1006 .maxlen = sizeof (int),
1007 .mode = 0644,
6d456111 1008 .proc_handler = proc_dointvec,
951f22d5 1009 },
c255d844 1010#endif
673d5b43 1011#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1012 {
c255d844 1013 .procname = "acpi_video_flags",
77afcf78 1014 .data = &acpi_realmode_flags,
c255d844
PM		 1015 .maxlen = sizeof (unsigned long),
1016 .mode = 0644,
6d456111 1017 .proc_handler = proc_doulongvec_minmax,
c255d844 1018 },
d2b176ed 1019#endif
b6fca725 1020#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1021 {
d2b176ed
JS		 1022 .procname = "ignore-unaligned-usertrap",
1023 .data = &no_unaligned_warning,
1024 .maxlen = sizeof (int),
1025 .mode = 0644,
6d456111 1026 .proc_handler = proc_dointvec,
d2b176ed 1027 },
b6fca725
VG		 1028#endif
1029#ifdef CONFIG_IA64
88fc241f 1030 {
88fc241f
DC		 1031 .procname = "unaligned-dump-stack",
1032 .data = &unaligned_dump_stack,
1033 .maxlen = sizeof (int),
1034 .mode = 0644,
6d456111 1035 .proc_handler = proc_dointvec,
88fc241f 1036 },
bebfa101 1037#endif
e162b39a
MSB		 1038#ifdef CONFIG_DETECT_HUNG_TASK
1039 {
e162b39a
MSB		 1040 .procname = "hung_task_panic",
1041 .data = &sysctl_hung_task_panic,
1042 .maxlen = sizeof(int),
1043 .mode = 0644,
6d456111 1044 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 1045 .extra1 = &zero,
1046 .extra2 = &one,
1047 },
82a1fcb9 1048 {
82a1fcb9
IM		 1049 .procname = "hung_task_check_count",
1050 .data = &sysctl_hung_task_check_count,
cd64647f 1051 .maxlen = sizeof(int),
82a1fcb9 1052 .mode = 0644,
cd64647f
LZ		 1053 .proc_handler = proc_dointvec_minmax,
1054 .extra1 = &zero,
82a1fcb9
IM		 1055 },
1056 {
82a1fcb9
IM		 1057 .procname = "hung_task_timeout_secs",
1058 .data = &sysctl_hung_task_timeout_secs,
90739081 1059 .maxlen = sizeof(unsigned long),
82a1fcb9 1060 .mode = 0644,
6d456111 1061 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1062 .extra2 = &hung_task_timeout_max,
82a1fcb9
IM		 1063 },
1064 {
82a1fcb9
IM		 1065 .procname = "hung_task_warnings",
1066 .data = &sysctl_hung_task_warnings,
270750db 1067 .maxlen = sizeof(int),
82a1fcb9 1068 .mode = 0644,
270750db
AT		 1069 .proc_handler = proc_dointvec_minmax,
1070 .extra1 = &neg_one,
82a1fcb9 1071 },
c4f3b63f 1072#endif
23f78d4a
IM		 1073#ifdef CONFIG_RT_MUTEXES
1074 {
23f78d4a
IM		 1075 .procname = "max_lock_depth",
1076 .data = &max_lock_depth,
1077 .maxlen = sizeof(int),
1078 .mode = 0644,
6d456111 1079 .proc_handler = proc_dointvec,
23f78d4a 1080 },
5096add8 1081#endif
10a0a8d4 1082 {
10a0a8d4
JF		 1083 .procname = "poweroff_cmd",
1084 .data = &poweroff_cmd,
1085 .maxlen = POWEROFF_CMD_PATH_LEN,
1086 .mode = 0644,
6d456111 1087 .proc_handler = proc_dostring,
10a0a8d4 1088 },
0b77f5bf
DH		 1089#ifdef CONFIG_KEYS
1090 {
0b77f5bf
DH		 1091 .procname = "keys",
1092 .mode = 0555,
1093 .child = key_sysctls,
1094 },
1095#endif
cdd6c482 1096#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1097 /*
1098 * User-space scripts rely on the existence of this file
1099 * as a feature check for perf_events being enabled.
1100 *
1101 * So it's an ABI, do not remove!
1102 */
1ccd1549 1103 {
cdd6c482
IM		 1104 .procname = "perf_event_paranoid",
1105 .data = &sysctl_perf_event_paranoid,
1106 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1107 .mode = 0644,
6d456111 1108 .proc_handler = proc_dointvec,
1ccd1549 1109 },
c5078f78 1110 {
cdd6c482
IM		 1111 .procname = "perf_event_mlock_kb",
1112 .data = &sysctl_perf_event_mlock,
1113 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1114 .mode = 0644,
6d456111 1115 .proc_handler = proc_dointvec,
c5078f78 1116 },
a78ac325 1117 {
cdd6c482
IM		 1118 .procname = "perf_event_max_sample_rate",
1119 .data = &sysctl_perf_event_sample_rate,
1120 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1121 .mode = 0644,
163ec435 1122 .proc_handler = perf_proc_update_handler,
723478c8 1123 .extra1 = &one,
a78ac325 1124 },
14c63f17
DH		 1125 {
1126 .procname = "perf_cpu_time_max_percent",
1127 .data = &sysctl_perf_cpu_time_max_percent,
1128 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1129 .mode = 0644,
1130 .proc_handler = perf_cpu_time_max_percent_handler,
1131 .extra1 = &zero,
1132 .extra2 = &one_hundred,
1133 },
c5dfd78e
ACM		 1134 {
1135 .procname = "perf_event_max_stack",
a831100a 1136 .data = &sysctl_perf_event_max_stack,
c5dfd78e
ACM		 1137 .maxlen = sizeof(sysctl_perf_event_max_stack),
1138 .mode = 0644,
1139 .proc_handler = perf_event_max_stack_handler,
1140 .extra1 = &zero,
1141 .extra2 = &six_hundred_forty_kb,
1142 },
c85b0334
ACM		 1143 {
1144 .procname = "perf_event_max_contexts_per_stack",
1145 .data = &sysctl_perf_event_max_contexts_per_stack,
1146 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1147 .mode = 0644,
1148 .proc_handler = perf_event_max_stack_handler,
1149 .extra1 = &zero,
1150 .extra2 = &one_thousand,
1151 },
1ccd1549 1152#endif
dfec072e
VN		 1153#ifdef CONFIG_KMEMCHECK
1154 {
dfec072e
VN		 1155 .procname = "kmemcheck",
1156 .data = &kmemcheck_enabled,
1157 .maxlen = sizeof(int),
1158 .mode = 0644,
6d456111 1159 .proc_handler = proc_dointvec,
dfec072e 1160 },
cb684b5b 1161#endif
9e3961a0
PB		 1162 {
1163 .procname = "panic_on_warn",
1164 .data = &panic_on_warn,
1165 .maxlen = sizeof(int),
1166 .mode = 0644,
1167 .proc_handler = proc_dointvec_minmax,
1168 .extra1 = &zero,
1169 .extra2 = &one,
1170 },
bc7a34b8
TG		 1171#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1172 {
1173 .procname = "timer_migration",
1174 .data = &sysctl_timer_migration,
1175 .maxlen = sizeof(unsigned int),
1176 .mode = 0644,
1177 .proc_handler = timer_migration_handler,
1178 },
1be7f75d
AS		 1179#endif
1180#ifdef CONFIG_BPF_SYSCALL
1181 {
1182 .procname = "unprivileged_bpf_disabled",
1183 .data = &sysctl_unprivileged_bpf_disabled,
1184 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1185 .mode = 0644,
1186 /* only handle a transition from default "0" to "1" */
1187 .proc_handler = proc_dointvec_minmax,
1188 .extra1 = &one,
1189 .extra2 = &one,
1190 },
088e9d25
DBO		 1191#endif
1192#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1193 {
1194 .procname = "panic_on_rcu_stall",
1195 .data = &sysctl_panic_on_rcu_stall,
1196 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_minmax,
1199 .extra1 = &zero,
1200 .extra2 = &one,
1201 },
bc7a34b8 1202#endif
6fce56ec 1203 { }
1da177e4
LT		 1204};
1205
d8217f07 1206static struct ctl_table vm_table[] = {
1da177e4 1207 {
1da177e4
LT		 1208 .procname = "overcommit_memory",
1209 .data = &sysctl_overcommit_memory,
1210 .maxlen = sizeof(sysctl_overcommit_memory),
1211 .mode = 0644,
cb16e95f
PH		 1212 .proc_handler = proc_dointvec_minmax,
1213 .extra1 = &zero,
1214 .extra2 = &two,
1da177e4 1215 },
fadd8fbd 1216 {
fadd8fbd
KH		 1217 .procname = "panic_on_oom",
1218 .data = &sysctl_panic_on_oom,
1219 .maxlen = sizeof(sysctl_panic_on_oom),
1220 .mode = 0644,
cb16e95f
PH		 1221 .proc_handler = proc_dointvec_minmax,
1222 .extra1 = &zero,
1223 .extra2 = &two,
fadd8fbd 1224 },
fe071d7e 1225 {
fe071d7e
DR		 1226 .procname = "oom_kill_allocating_task",
1227 .data = &sysctl_oom_kill_allocating_task,
1228 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1229 .mode = 0644,
6d456111 1230 .proc_handler = proc_dointvec,
fe071d7e 1231 },
fef1bdd6 1232 {
fef1bdd6
DR		 1233 .procname = "oom_dump_tasks",
1234 .data = &sysctl_oom_dump_tasks,
1235 .maxlen = sizeof(sysctl_oom_dump_tasks),
1236 .mode = 0644,
6d456111 1237 .proc_handler = proc_dointvec,
fef1bdd6 1238 },
1da177e4 1239 {
1da177e4
LT		 1240 .procname = "overcommit_ratio",
1241 .data = &sysctl_overcommit_ratio,
1242 .maxlen = sizeof(sysctl_overcommit_ratio),
1243 .mode = 0644,
49f0ce5f
JM		 1244 .proc_handler = overcommit_ratio_handler,
1245 },
1246 {
1247 .procname = "overcommit_kbytes",
1248 .data = &sysctl_overcommit_kbytes,
1249 .maxlen = sizeof(sysctl_overcommit_kbytes),
1250 .mode = 0644,
1251 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1252 },
1253 {
1da177e4
LT		 1254 .procname = "page-cluster",
1255 .data = &page_cluster,
1256 .maxlen = sizeof(int),
1257 .mode = 0644,
cb16e95f
PH		 1258 .proc_handler = proc_dointvec_minmax,
1259 .extra1 = &zero,
1da177e4
LT		 1260 },
1261 {
1da177e4
LT		 1262 .procname = "dirty_background_ratio",
1263 .data = &dirty_background_ratio,
1264 .maxlen = sizeof(dirty_background_ratio),
1265 .mode = 0644,
6d456111 1266 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1267 .extra1 = &zero,
1268 .extra2 = &one_hundred,
1269 },
2da02997 1270 {
2da02997
DR		 1271 .procname = "dirty_background_bytes",
1272 .data = &dirty_background_bytes,
1273 .maxlen = sizeof(dirty_background_bytes),
1274 .mode = 0644,
6d456111 1275 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1276 .extra1 = &one_ul,
2da02997 1277 },
1da177e4 1278 {
1da177e4
LT		 1279 .procname = "dirty_ratio",
1280 .data = &vm_dirty_ratio,
1281 .maxlen = sizeof(vm_dirty_ratio),
1282 .mode = 0644,
6d456111 1283 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1284 .extra1 = &zero,
1285 .extra2 = &one_hundred,
1286 },
2da02997 1287 {
2da02997
DR		 1288 .procname = "dirty_bytes",
1289 .data = &vm_dirty_bytes,
1290 .maxlen = sizeof(vm_dirty_bytes),
1291 .mode = 0644,
6d456111 1292 .proc_handler = dirty_bytes_handler,
9e4a5bda 1293 .extra1 = &dirty_bytes_min,
2da02997 1294 },
1da177e4 1295 {
1da177e4 1296 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1297 .data = &dirty_writeback_interval,
1298 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1299 .mode = 0644,
6d456111 1300 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1301 },
1302 {
1da177e4 1303 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1304 .data = &dirty_expire_interval,
1305 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1306 .mode = 0644,
cb16e95f
PH		 1307 .proc_handler = proc_dointvec_minmax,
1308 .extra1 = &zero,
1da177e4 1309 },
1efff914
TT		 1310 {
1311 .procname = "dirtytime_expire_seconds",
1312 .data = &dirtytime_expire_interval,
1313 .maxlen = sizeof(dirty_expire_interval),
1314 .mode = 0644,
1315 .proc_handler = dirtytime_interval_handler,
1316 .extra1 = &zero,
1317 },
1da177e4 1318 {
3965c9ae
WL		 1319 .procname = "nr_pdflush_threads",
1320 .mode = 0444 /* read-only */,
1321 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1322 },
1323 {
1da177e4
LT		 1324 .procname = "swappiness",
1325 .data = &vm_swappiness,
1326 .maxlen = sizeof(vm_swappiness),
1327 .mode = 0644,
6d456111 1328 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1329 .extra1 = &zero,
1330 .extra2 = &one_hundred,
1331 },
1332#ifdef CONFIG_HUGETLB_PAGE
06808b08 1333 {
1da177e4 1334 .procname = "nr_hugepages",
e5ff2159 1335 .data = NULL,
1da177e4
LT		 1336 .maxlen = sizeof(unsigned long),
1337 .mode = 0644,
6d456111 1338 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1339 },
1340#ifdef CONFIG_NUMA
1341 {
1342 .procname = "nr_hugepages_mempolicy",
1343 .data = NULL,
1344 .maxlen = sizeof(unsigned long),
1345 .mode = 0644,
1346 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1347 },
1348#endif
1da177e4 1349 {
1da177e4
LT		 1350 .procname = "hugetlb_shm_group",
1351 .data = &sysctl_hugetlb_shm_group,
1352 .maxlen = sizeof(gid_t),
1353 .mode = 0644,
6d456111 1354 .proc_handler = proc_dointvec,
1da177e4 1355 },
396faf03 1356 {
396faf03
MG		 1357 .procname = "hugepages_treat_as_movable",
1358 .data = &hugepages_treat_as_movable,
1359 .maxlen = sizeof(int),
1360 .mode = 0644,
86cdb465 1361 .proc_handler = proc_dointvec,
396faf03 1362 },
d1c3fb1f 1363 {
d1c3fb1f 1364 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1365 .data = NULL,
1366 .maxlen = sizeof(unsigned long),
d1c3fb1f 1367 .mode = 0644,
6d456111 1368 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1369 },
1da177e4
LT		 1370#endif
1371 {
1da177e4
LT		 1372 .procname = "lowmem_reserve_ratio",
1373 .data = &sysctl_lowmem_reserve_ratio,
1374 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1375 .mode = 0644,
6d456111 1376 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1377 },
9d0243bc 1378 {
9d0243bc
AM		 1379 .procname = "drop_caches",
1380 .data = &sysctl_drop_caches,
1381 .maxlen = sizeof(int),
1382 .mode = 0644,
1383 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1384 .extra1 = &one,
5509a5d2 1385 .extra2 = &four,
9d0243bc 1386 },
76ab0f53
MG		 1387#ifdef CONFIG_COMPACTION
1388 {
1389 .procname = "compact_memory",
1390 .data = &sysctl_compact_memory,
1391 .maxlen = sizeof(int),
1392 .mode = 0200,
1393 .proc_handler = sysctl_compaction_handler,
1394 },
5e771905
MG		 1395 {
1396 .procname = "extfrag_threshold",
1397 .data = &sysctl_extfrag_threshold,
1398 .maxlen = sizeof(int),
1399 .mode = 0644,
1400 .proc_handler = sysctl_extfrag_handler,
1401 .extra1 = &min_extfrag_threshold,
1402 .extra2 = &max_extfrag_threshold,
1403 },
5bbe3547
EM		 1404 {
1405 .procname = "compact_unevictable_allowed",
1406 .data = &sysctl_compact_unevictable_allowed,
1407 .maxlen = sizeof(int),
1408 .mode = 0644,
1409 .proc_handler = proc_dointvec,
1410 .extra1 = &zero,
1411 .extra2 = &one,
1412 },
5e771905 1413
76ab0f53 1414#endif /* CONFIG_COMPACTION */
1da177e4 1415 {
1da177e4
LT		 1416 .procname = "min_free_kbytes",
1417 .data = &min_free_kbytes,
1418 .maxlen = sizeof(min_free_kbytes),
1419 .mode = 0644,
6d456111 1420 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1421 .extra1 = &zero,
1422 },
795ae7a0
JW		 1423 {
1424 .procname = "watermark_scale_factor",
1425 .data = &watermark_scale_factor,
1426 .maxlen = sizeof(watermark_scale_factor),
1427 .mode = 0644,
1428 .proc_handler = watermark_scale_factor_sysctl_handler,
1429 .extra1 = &one,
1430 .extra2 = &one_thousand,
1431 },
8ad4b1fb 1432 {
8ad4b1fb
RS		 1433 .procname = "percpu_pagelist_fraction",
1434 .data = &percpu_pagelist_fraction,
1435 .maxlen = sizeof(percpu_pagelist_fraction),
1436 .mode = 0644,
6d456111 1437 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1438 .extra1 = &zero,
8ad4b1fb 1439 },
1da177e4
LT		 1440#ifdef CONFIG_MMU
1441 {
1da177e4
LT		 1442 .procname = "max_map_count",
1443 .data = &sysctl_max_map_count,
1444 .maxlen = sizeof(sysctl_max_map_count),
1445 .mode = 0644,
3e26120c 1446 .proc_handler = proc_dointvec_minmax,
70da2340 1447 .extra1 = &zero,
1da177e4 1448 },
dd8632a1
PM		 1449#else
1450 {
dd8632a1
PM		 1451 .procname = "nr_trim_pages",
1452 .data = &sysctl_nr_trim_pages,
1453 .maxlen = sizeof(sysctl_nr_trim_pages),
1454 .mode = 0644,
6d456111 1455 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1456 .extra1 = &zero,
1457 },
1da177e4
LT		 1458#endif
1459 {
1da177e4
LT		 1460 .procname = "laptop_mode",
1461 .data = &laptop_mode,
1462 .maxlen = sizeof(laptop_mode),
1463 .mode = 0644,
6d456111 1464 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1465 },
1466 {
1da177e4
LT		 1467 .procname = "block_dump",
1468 .data = &block_dump,
1469 .maxlen = sizeof(block_dump),
1470 .mode = 0644,
6d456111 1471 .proc_handler = proc_dointvec,
1da177e4
LT		 1472 .extra1 = &zero,
1473 },
1474 {
1da177e4
LT		 1475 .procname = "vfs_cache_pressure",
1476 .data = &sysctl_vfs_cache_pressure,
1477 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1478 .mode = 0644,
6d456111 1479 .proc_handler = proc_dointvec,
1da177e4
LT		 1480 .extra1 = &zero,
1481 },
1482#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1483 {
1da177e4
LT		 1484 .procname = "legacy_va_layout",
1485 .data = &sysctl_legacy_va_layout,
1486 .maxlen = sizeof(sysctl_legacy_va_layout),
1487 .mode = 0644,
6d456111 1488 .proc_handler = proc_dointvec,
1da177e4
LT		 1489 .extra1 = &zero,
1490 },
1491#endif
1743660b
CL		 1492#ifdef CONFIG_NUMA
1493 {
1743660b 1494 .procname = "zone_reclaim_mode",
a5f5f91d
MG		 1495 .data = &node_reclaim_mode,
1496 .maxlen = sizeof(node_reclaim_mode),
1743660b 1497 .mode = 0644,
6d456111 1498 .proc_handler = proc_dointvec,
c84db23c 1499 .extra1 = &zero,
1743660b 1500 },
9614634f 1501 {
9614634f
CL		 1502 .procname = "min_unmapped_ratio",
1503 .data = &sysctl_min_unmapped_ratio,
1504 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1505 .mode = 0644,
6d456111 1506 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1507 .extra1 = &zero,
1508 .extra2 = &one_hundred,
1509 },
0ff38490 1510 {
0ff38490
CL		 1511 .procname = "min_slab_ratio",
1512 .data = &sysctl_min_slab_ratio,
1513 .maxlen = sizeof(sysctl_min_slab_ratio),
1514 .mode = 0644,
6d456111 1515 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1516 .extra1 = &zero,
1517 .extra2 = &one_hundred,
1518 },
e6e5494c 1519#endif
77461ab3
CL		 1520#ifdef CONFIG_SMP
1521 {
77461ab3
CL		 1522 .procname = "stat_interval",
1523 .data = &sysctl_stat_interval,
1524 .maxlen = sizeof(sysctl_stat_interval),
1525 .mode = 0644,
6d456111 1526 .proc_handler = proc_dointvec_jiffies,
77461ab3 1527 },
52b6f46b
HD		 1528 {
1529 .procname = "stat_refresh",
1530 .data = NULL,
1531 .maxlen = 0,
1532 .mode = 0600,
1533 .proc_handler = vmstat_refresh,
1534 },
77461ab3 1535#endif
6e141546 1536#ifdef CONFIG_MMU
ed032189 1537 {
ed032189 1538 .procname = "mmap_min_addr",
788084ab
EP		 1539 .data = &dac_mmap_min_addr,
1540 .maxlen = sizeof(unsigned long),
ed032189 1541 .mode = 0644,
6d456111 1542 .proc_handler = mmap_min_addr_handler,
ed032189 1543 },
6e141546 1544#endif
f0c0b2b8
KH		 1545#ifdef CONFIG_NUMA
1546 {
f0c0b2b8
KH		 1547 .procname = "numa_zonelist_order",
1548 .data = &numa_zonelist_order,
1549 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1550 .mode = 0644,
6d456111 1551 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1552 },
1553#endif
2b8232ce 1554#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1555 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1556 {
e6e5494c 1557 .procname = "vdso_enabled",
3d7ee969
AL		 1558#ifdef CONFIG_X86_32
1559 .data = &vdso32_enabled,
1560 .maxlen = sizeof(vdso32_enabled),
1561#else
e6e5494c
IM		 1562 .data = &vdso_enabled,
1563 .maxlen = sizeof(vdso_enabled),
3d7ee969 1564#endif
e6e5494c 1565 .mode = 0644,
6d456111 1566 .proc_handler = proc_dointvec,
e6e5494c
IM		 1567 .extra1 = &zero,
1568 },
1da177e4 1569#endif
195cf453
BG		 1570#ifdef CONFIG_HIGHMEM
1571 {
195cf453
BG		 1572 .procname = "highmem_is_dirtyable",
1573 .data = &vm_highmem_is_dirtyable,
1574 .maxlen = sizeof(vm_highmem_is_dirtyable),
1575 .mode = 0644,
6d456111 1576 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1577 .extra1 = &zero,
1578 .extra2 = &one,
1579 },
1580#endif
6a46079c
AK		 1581#ifdef CONFIG_MEMORY_FAILURE
1582 {
6a46079c
AK		 1583 .procname = "memory_failure_early_kill",
1584 .data = &sysctl_memory_failure_early_kill,
1585 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1586 .mode = 0644,
6d456111 1587 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1588 .extra1 = &zero,
1589 .extra2 = &one,
1590 },
1591 {
6a46079c
AK		 1592 .procname = "memory_failure_recovery",
1593 .data = &sysctl_memory_failure_recovery,
1594 .maxlen = sizeof(sysctl_memory_failure_recovery),
1595 .mode = 0644,
6d456111 1596 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1597 .extra1 = &zero,
1598 .extra2 = &one,
1599 },
1600#endif
c9b1d098
AS		 1601 {
1602 .procname = "user_reserve_kbytes",
1603 .data = &sysctl_user_reserve_kbytes,
1604 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1605 .mode = 0644,
1606 .proc_handler = proc_doulongvec_minmax,
1607 },
4eeab4f5
AS		 1608 {
1609 .procname = "admin_reserve_kbytes",
1610 .data = &sysctl_admin_reserve_kbytes,
1611 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1612 .mode = 0644,
1613 .proc_handler = proc_doulongvec_minmax,
1614 },
d07e2259
DC		 1615#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1616 {
1617 .procname = "mmap_rnd_bits",
1618 .data = &mmap_rnd_bits,
1619 .maxlen = sizeof(mmap_rnd_bits),
1620 .mode = 0600,
1621 .proc_handler = proc_dointvec_minmax,
1622 .extra1 = (void *)&mmap_rnd_bits_min,
1623 .extra2 = (void *)&mmap_rnd_bits_max,
1624 },
1625#endif
1626#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1627 {
1628 .procname = "mmap_rnd_compat_bits",
1629 .data = &mmap_rnd_compat_bits,
1630 .maxlen = sizeof(mmap_rnd_compat_bits),
1631 .mode = 0600,
1632 .proc_handler = proc_dointvec_minmax,
1633 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1634 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1635 },
1636#endif
6fce56ec 1637 { }
1da177e4
LT		 1638};
1639
d8217f07 1640static struct ctl_table fs_table[] = {
1da177e4 1641 {
1da177e4
LT		 1642 .procname = "inode-nr",
1643 .data = &inodes_stat,
3942c07c 1644 .maxlen = 2*sizeof(long),
1da177e4 1645 .mode = 0444,
cffbc8aa 1646 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1647 },
1648 {
1da177e4
LT		 1649 .procname = "inode-state",
1650 .data = &inodes_stat,
3942c07c 1651 .maxlen = 7*sizeof(long),
1da177e4 1652 .mode = 0444,
cffbc8aa 1653 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1654 },
1655 {
1da177e4
LT		 1656 .procname = "file-nr",
1657 .data = &files_stat,
518de9b3 1658 .maxlen = sizeof(files_stat),
1da177e4 1659 .mode = 0444,
6d456111 1660 .proc_handler = proc_nr_files,
1da177e4
LT		 1661 },
1662 {
1da177e4
LT		 1663 .procname = "file-max",
1664 .data = &files_stat.max_files,
518de9b3 1665 .maxlen = sizeof(files_stat.max_files),
1da177e4 1666 .mode = 0644,
518de9b3 1667 .proc_handler = proc_doulongvec_minmax,
1da177e4 1668 },
9cfe015a 1669 {
9cfe015a
ED		 1670 .procname = "nr_open",
1671 .data = &sysctl_nr_open,
9b80a184 1672 .maxlen = sizeof(unsigned int),
9cfe015a 1673 .mode = 0644,
6d456111 1674 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1675 .extra1 = &sysctl_nr_open_min,
1676 .extra2 = &sysctl_nr_open_max,
9cfe015a 1677 },
1da177e4 1678 {
1da177e4
LT		 1679 .procname = "dentry-state",
1680 .data = &dentry_stat,
3942c07c 1681 .maxlen = 6*sizeof(long),
1da177e4 1682 .mode = 0444,
312d3ca8 1683 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1684 },
1685 {
1da177e4
LT		 1686 .procname = "overflowuid",
1687 .data = &fs_overflowuid,
1688 .maxlen = sizeof(int),
1689 .mode = 0644,
6d456111 1690 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1691 .extra1 = &minolduid,
1692 .extra2 = &maxolduid,
1693 },
1694 {
1da177e4
LT		 1695 .procname = "overflowgid",
1696 .data = &fs_overflowgid,
1697 .maxlen = sizeof(int),
1698 .mode = 0644,
6d456111 1699 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1700 .extra1 = &minolduid,
1701 .extra2 = &maxolduid,
1702 },
bfcd17a6 1703#ifdef CONFIG_FILE_LOCKING
1da177e4 1704 {
1da177e4
LT		 1705 .procname = "leases-enable",
1706 .data = &leases_enable,
1707 .maxlen = sizeof(int),
1708 .mode = 0644,
6d456111 1709 .proc_handler = proc_dointvec,
1da177e4 1710 },
bfcd17a6 1711#endif
1da177e4
LT		 1712#ifdef CONFIG_DNOTIFY
1713 {
1da177e4
LT		 1714 .procname = "dir-notify-enable",
1715 .data = &dir_notify_enable,
1716 .maxlen = sizeof(int),
1717 .mode = 0644,
6d456111 1718 .proc_handler = proc_dointvec,
1da177e4
LT		 1719 },
1720#endif
1721#ifdef CONFIG_MMU
bfcd17a6 1722#ifdef CONFIG_FILE_LOCKING
1da177e4 1723 {
1da177e4
LT		 1724 .procname = "lease-break-time",
1725 .data = &lease_break_time,
1726 .maxlen = sizeof(int),
1727 .mode = 0644,
6d456111 1728 .proc_handler = proc_dointvec,
1da177e4 1729 },
bfcd17a6 1730#endif
ebf3f09c 1731#ifdef CONFIG_AIO
1da177e4 1732 {
1da177e4
LT		 1733 .procname = "aio-nr",
1734 .data = &aio_nr,
1735 .maxlen = sizeof(aio_nr),
1736 .mode = 0444,
6d456111 1737 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1738 },
1739 {
1da177e4
LT		 1740 .procname = "aio-max-nr",
1741 .data = &aio_max_nr,
1742 .maxlen = sizeof(aio_max_nr),
1743 .mode = 0644,
6d456111 1744 .proc_handler = proc_doulongvec_minmax,
1da177e4 1745 },
ebf3f09c 1746#endif /* CONFIG_AIO */
2d9048e2 1747#ifdef CONFIG_INOTIFY_USER
0399cb08 1748 {
0399cb08
RL		 1749 .procname = "inotify",
1750 .mode = 0555,
1751 .child = inotify_table,
1752 },
1753#endif
7ef9964e
DL		 1754#ifdef CONFIG_EPOLL
1755 {
1756 .procname = "epoll",
1757 .mode = 0555,
1758 .child = epoll_table,
1759 },
1760#endif
1da177e4 1761#endif
800179c9
KC		 1762 {
1763 .procname = "protected_symlinks",
1764 .data = &sysctl_protected_symlinks,
1765 .maxlen = sizeof(int),
1766 .mode = 0600,
1767 .proc_handler = proc_dointvec_minmax,
1768 .extra1 = &zero,
1769 .extra2 = &one,
1770 },
1771 {
1772 .procname = "protected_hardlinks",
1773 .data = &sysctl_protected_hardlinks,
1774 .maxlen = sizeof(int),
1775 .mode = 0600,
1776 .proc_handler = proc_dointvec_minmax,
1777 .extra1 = &zero,
1778 .extra2 = &one,
1779 },
d6e71144 1780 {
d6e71144
AC		 1781 .procname = "suid_dumpable",
1782 .data = &suid_dumpable,
1783 .maxlen = sizeof(int),
1784 .mode = 0644,
54b50199 1785 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1786 .extra1 = &zero,
1787 .extra2 = &two,
d6e71144 1788 },
2abc26fc
EB		 1789#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1790 {
2abc26fc
EB		 1791 .procname = "binfmt_misc",
1792 .mode = 0555,
f9bd6733 1793 .child = sysctl_mount_point,
2abc26fc
EB		 1794 },
1795#endif
b492e95b 1796 {
ff9da691
JA		 1797 .procname = "pipe-max-size",
1798 .data = &pipe_max_size,
b492e95b
JA		 1799 .maxlen = sizeof(int),
1800 .mode = 0644,
ff9da691
JA		 1801 .proc_handler = &pipe_proc_fn,
1802 .extra1 = &pipe_min_size,
b492e95b 1803 },
759c0114
WT		 1804 {
1805 .procname = "pipe-user-pages-hard",
1806 .data = &pipe_user_pages_hard,
1807 .maxlen = sizeof(pipe_user_pages_hard),
1808 .mode = 0644,
1809 .proc_handler = proc_doulongvec_minmax,
1810 },
1811 {
1812 .procname = "pipe-user-pages-soft",
1813 .data = &pipe_user_pages_soft,
1814 .maxlen = sizeof(pipe_user_pages_soft),
1815 .mode = 0644,
1816 .proc_handler = proc_doulongvec_minmax,
1817 },
d2921684
EB		 1818 {
1819 .procname = "mount-max",
1820 .data = &sysctl_mount_max,
1821 .maxlen = sizeof(unsigned int),
1822 .mode = 0644,
1823 .proc_handler = proc_dointvec_minmax,
1824 .extra1 = &one,
1825 },
6fce56ec 1826 { }
1da177e4
LT		 1827};
1828
d8217f07 1829static struct ctl_table debug_table[] = {
7ac57a89 1830#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1831 {
abd4f750
MAS		 1832 .procname = "exception-trace",
1833 .data = &show_unhandled_signals,
1834 .maxlen = sizeof(int),
1835 .mode = 0644,
1836 .proc_handler = proc_dointvec
1837 },
b2be84df
MH		 1838#endif
1839#if defined(CONFIG_OPTPROBES)
1840 {
1841 .procname = "kprobes-optimization",
1842 .data = &sysctl_kprobes_optimization,
1843 .maxlen = sizeof(int),
1844 .mode = 0644,
1845 .proc_handler = proc_kprobes_optimization_handler,
1846 .extra1 = &zero,
1847 .extra2 = &one,
1848 },
abd4f750 1849#endif
6fce56ec 1850 { }
1da177e4
LT		 1851};
1852
d8217f07 1853static struct ctl_table dev_table[] = {
6fce56ec 1854 { }
0eeca283 1855};
1da177e4 1856
de4e83bd 1857int __init sysctl_init(void)
d912b0cc 1858{
fd4b616b
SR		 1859 struct ctl_table_header *hdr;
1860
1861 hdr = register_sysctl_table(sysctl_base_table);
1862 kmemleak_not_leak(hdr);
d912b0cc
EB		 1863 return 0;
1864}
1865
b89a8171
EB		 1866#endif /* CONFIG_SYSCTL */
1867
1da177e4
LT		 1868/*
1869 * /proc/sys support
1870 */
1871
b89a8171 1872#ifdef CONFIG_PROC_SYSCTL
1da177e4 1873
f8808300
KC		 1874static int _proc_do_string(char *data, int maxlen, int write,
1875 char __user *buffer,
b1ba4ddd 1876 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1877{
1878 size_t len;
1879 char __user *p;
1880 char c;
8d060877
ON		 1881
1882 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1883 *lenp = 0;
1884 return 0;
1885 }
8d060877 1886
1da177e4 1887 if (write) {
f4aacea2
KC		 1888 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1889 /* Only continue writes not past the end of buffer. */
1890 len = strlen(data);
1891 if (len > maxlen - 1)
1892 len = maxlen - 1;
1893
1894 if (*ppos > len)
1895 return 0;
1896 len = *ppos;
1897 } else {
1898 /* Start writing from beginning of buffer. */
1899 len = 0;
1900 }
1901
2ca9bb45 1902 *ppos += *lenp;
1da177e4 1903 p = buffer;
2ca9bb45 1904 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1905 if (get_user(c, p++))
1906 return -EFAULT;
1907 if (c == 0 || c == '\n')
1908 break;
2ca9bb45 1909 data[len++] = c;
1da177e4 1910 }
f8808300 1911 data[len] = 0;
1da177e4 1912 } else {
f5dd3d6f
SV		 1913 len = strlen(data);
1914 if (len > maxlen)
1915 len = maxlen;
8d060877
ON		 1916
1917 if (*ppos > len) {
1918 *lenp = 0;
1919 return 0;
1920 }
1921
1922 data += *ppos;
1923 len -= *ppos;
1924
1da177e4
LT		 1925 if (len > *lenp)
1926 len = *lenp;
1927 if (len)
f8808300 1928 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1929 return -EFAULT;
1930 if (len < *lenp) {
f8808300 1931 if (put_user('\n', buffer + len))
1da177e4
LT		 1932 return -EFAULT;
1933 len++;
1934 }
1935 *lenp = len;
1936 *ppos += len;
1937 }
1938 return 0;
1939}
1940
f4aacea2
KC		 1941static void warn_sysctl_write(struct ctl_table *table)
1942{
1943 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1944 "This will not be supported in the future. To silence this\n"
1945 "warning, set kernel.sysctl_writes_strict = -1\n",
1946 current->comm, table->procname);
1947}
1948
f5dd3d6f
SV		 1949/**
1950 * proc_dostring - read a string sysctl
1951 * @table: the sysctl table
1952 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 1953 * @buffer: the user buffer
1954 * @lenp: the size of the user buffer
1955 * @ppos: file position
1956 *
1957 * Reads/writes a string from/to the user buffer. If the kernel
1958 * buffer provided is not large enough to hold the string, the
1959 * string is truncated. The copied string is %NULL-terminated.
1960 * If the string is being read by the user process, it is copied
1961 * and a newline '\n' is added. It is truncated if the buffer is
1962 * not large enough.
1963 *
1964 * Returns 0 on success.
1965 */
8d65af78 1966int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 1967 void __user *buffer, size_t *lenp, loff_t *ppos)
1968{
f4aacea2
KC		 1969 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1970 warn_sysctl_write(table);
1971
f8808300
KC		 1972 return _proc_do_string((char *)(table->data), table->maxlen, write,
1973 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 1974}
1975
00b7c339
AW		 1976static size_t proc_skip_spaces(char **buf)
1977{
1978 size_t ret;
1979 char *tmp = skip_spaces(*buf);
1980 ret = tmp - *buf;
1981 *buf = tmp;
1982 return ret;
1983}
1984
9f977fb7
OP		 1985static void proc_skip_char(char **buf, size_t *size, const char v)
1986{
1987 while (*size) {
1988 if (**buf != v)
1989 break;
1990 (*size)--;
1991 (*buf)++;
1992 }
1993}
1994
00b7c339
AW		 1995#define TMPBUFLEN 22
1996/**
0fc377bd 1997 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 1998 *
0fc377bd
RD		 1999 * @buf: a kernel buffer
2000 * @size: size of the kernel buffer
2001 * @val: this is where the number will be stored
2002 * @neg: set to %TRUE if number is negative
2003 * @perm_tr: a vector which contains the allowed trailers
2004 * @perm_tr_len: size of the perm_tr vector
2005 * @tr: pointer to store the trailer character
00b7c339 2006 *
0fc377bd
RD		 2007 * In case of success %0 is returned and @buf and @size are updated with
2008 * the amount of bytes read. If @tr is non-NULL and a trailing
2009 * character exists (size is non-zero after returning from this
2010 * function), @tr is updated with the trailing character.
00b7c339
AW		 2011 */
2012static int proc_get_long(char **buf, size_t *size,
2013 unsigned long *val, bool *neg,
2014 const char *perm_tr, unsigned perm_tr_len, char *tr)
2015{
2016 int len;
2017 char *p, tmp[TMPBUFLEN];
2018
2019 if (!*size)
2020 return -EINVAL;
2021
2022 len = *size;
2023 if (len > TMPBUFLEN - 1)
2024 len = TMPBUFLEN - 1;
2025
2026 memcpy(tmp, *buf, len);
2027
2028 tmp[len] = 0;
2029 p = tmp;
2030 if (*p == '-' && *size > 1) {
2031 *neg = true;
2032 p++;
2033 } else
2034 *neg = false;
2035 if (!isdigit(*p))
2036 return -EINVAL;
2037
2038 *val = simple_strtoul(p, &p, 0);
2039
2040 len = p - tmp;
2041
2042 /* We don't know if the next char is whitespace thus we may accept
2043 * invalid integers (e.g. 1234...a) or two integers instead of one
2044 * (e.g. 123...1). So lets not allow such large numbers. */
2045 if (len == TMPBUFLEN - 1)
2046 return -EINVAL;
2047
2048 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2049 return -EINVAL;
1da177e4 2050
00b7c339
AW		 2051 if (tr && (len < *size))
2052 *tr = *p;
2053
2054 *buf += len;
2055 *size -= len;
2056
2057 return 0;
2058}
2059
2060/**
0fc377bd 2061 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2062 *
0fc377bd
RD		 2063 * @buf: the user buffer
2064 * @size: the size of the user buffer
2065 * @val: the integer to be converted
2066 * @neg: sign of the number, %TRUE for negative
00b7c339 2067 *
0fc377bd
RD		 2068 * In case of success %0 is returned and @buf and @size are updated with
2069 * the amount of bytes written.
00b7c339
AW		 2070 */
2071static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2072 bool neg)
2073{
2074 int len;
2075 char tmp[TMPBUFLEN], *p = tmp;
2076
2077 sprintf(p, "%s%lu", neg ? "-" : "", val);
2078 len = strlen(tmp);
2079 if (len > *size)
2080 len = *size;
2081 if (copy_to_user(*buf, tmp, len))
2082 return -EFAULT;
2083 *size -= len;
2084 *buf += len;
2085 return 0;
2086}
2087#undef TMPBUFLEN
2088
2089static int proc_put_char(void __user **buf, size_t *size, char c)
2090{
2091 if (*size) {
2092 char __user **buffer = (char __user **)buf;
2093 if (put_user(c, *buffer))
2094 return -EFAULT;
2095 (*size)--, (*buffer)++;
2096 *buf = *buffer;
2097 }
2098 return 0;
2099}
1da177e4 2100
00b7c339 2101static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2102 int *valp,
2103 int write, void *data)
2104{
2105 if (write) {
230633d1
HS		 2106 if (*negp) {
2107 if (*lvalp > (unsigned long) INT_MAX + 1)
2108 return -EINVAL;
2109 *valp = -*lvalp;
2110 } else {
2111 if (*lvalp > (unsigned long) INT_MAX)
2112 return -EINVAL;
2113 *valp = *lvalp;
2114 }
1da177e4
LT		 2115 } else {
2116 int val = *valp;
2117 if (val < 0) {
00b7c339 2118 *negp = true;
9a5bc726 2119 *lvalp = -(unsigned long)val;
1da177e4 2120 } else {
00b7c339 2121 *negp = false;
1da177e4
LT		 2122 *lvalp = (unsigned long)val;
2123 }
2124 }
2125 return 0;
2126}
2127
e7d316a0
SAK		 2128static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2129 int *valp,
2130 int write, void *data)
2131{
2132 if (write) {
2133 if (*negp)
2134 return -EINVAL;
2135 *valp = *lvalp;
2136 } else {
2137 unsigned int val = *valp;
2138 *lvalp = (unsigned long)val;
2139 }
2140 return 0;
2141}
2142
00b7c339
AW		 2143static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2144
d8217f07 2145static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2146 int write, void __user *buffer,
fcfbd547 2147 size_t *lenp, loff_t *ppos,
00b7c339 2148 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2149 int write, void *data),
2150 void *data)
2151{
00b7c339 2152 int *i, vleft, first = 1, err = 0;
00b7c339 2153 size_t left;
70f6cbb6 2154 char *kbuf = NULL, *p;
1da177e4 2155
00b7c339 2156 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2157 *lenp = 0;
2158 return 0;
2159 }
2160
fcfbd547 2161 i = (int *) tbl_data;
1da177e4
LT		 2162 vleft = table->maxlen / sizeof(*i);
2163 left = *lenp;
2164
2165 if (!conv)
2166 conv = do_proc_dointvec_conv;
2167
00b7c339 2168 if (write) {
f4aacea2
KC		 2169 if (*ppos) {
2170 switch (sysctl_writes_strict) {
2171 case SYSCTL_WRITES_STRICT:
2172 goto out;
2173 case SYSCTL_WRITES_WARN:
2174 warn_sysctl_write(table);
2175 break;
2176 default:
2177 break;
2178 }
2179 }
2180
00b7c339
AW		 2181 if (left > PAGE_SIZE - 1)
2182 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2183 p = kbuf = memdup_user_nul(buffer, left);
2184 if (IS_ERR(kbuf))
2185 return PTR_ERR(kbuf);
00b7c339
AW		 2186 }
2187
1da177e4 2188 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2189 unsigned long lval;
2190 bool neg;
1da177e4 2191
00b7c339 2192 if (write) {
70f6cbb6 2193 left -= proc_skip_spaces(&p);
1da177e4 2194
563b0467
O		 2195 if (!left)
2196 break;
70f6cbb6 2197 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2198 proc_wspace_sep,
2199 sizeof(proc_wspace_sep), NULL);
2200 if (err)
1da177e4 2201 break;
00b7c339
AW		 2202 if (conv(&neg, &lval, i, 1, data)) {
2203 err = -EINVAL;
1da177e4 2204 break;
00b7c339 2205 }
1da177e4 2206 } else {
00b7c339
AW		 2207 if (conv(&neg, &lval, i, 0, data)) {
2208 err = -EINVAL;
2209 break;
2210 }
1da177e4 2211 if (!first)
00b7c339
AW		 2212 err = proc_put_char(&buffer, &left, '\t');
2213 if (err)
2214 break;
2215 err = proc_put_long(&buffer, &left, lval, neg);
2216 if (err)
1da177e4 2217 break;
1da177e4
LT		 2218 }
2219 }
2220
00b7c339
AW		 2221 if (!write && !first && left && !err)
2222 err = proc_put_char(&buffer, &left, '\n');
563b0467 2223 if (write && !err && left)
70f6cbb6 2224 left -= proc_skip_spaces(&p);
1da177e4 2225 if (write) {
70f6cbb6 2226 kfree(kbuf);
00b7c339
AW		 2227 if (first)
2228 return err ? : -EINVAL;
1da177e4 2229 }
1da177e4 2230 *lenp -= left;
f4aacea2 2231out:
1da177e4 2232 *ppos += *lenp;
00b7c339 2233 return err;
1da177e4
LT		 2234}
2235
8d65af78 2236static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2237 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2238 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2239 int write, void *data),
2240 void *data)
2241{
8d65af78 2242 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2243 buffer, lenp, ppos, conv, data);
2244}
2245
1da177e4
LT		 2246/**
2247 * proc_dointvec - read a vector of integers
2248 * @table: the sysctl table
2249 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2250 * @buffer: the user buffer
2251 * @lenp: the size of the user buffer
2252 * @ppos: file position
2253 *
2254 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2255 * values from/to the user buffer, treated as an ASCII string.
2256 *
2257 * Returns 0 on success.
2258 */
8d65af78 2259int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2260 void __user *buffer, size_t *lenp, loff_t *ppos)
2261{
e7d316a0
SAK		 2262 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2263}
2264
2265/**
2266 * proc_douintvec - read a vector of unsigned integers
2267 * @table: the sysctl table
2268 * @write: %TRUE if this is a write to the sysctl file
2269 * @buffer: the user buffer
2270 * @lenp: the size of the user buffer
2271 * @ppos: file position
2272 *
2273 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2274 * values from/to the user buffer, treated as an ASCII string.
2275 *
2276 * Returns 0 on success.
2277 */
2278int proc_douintvec(struct ctl_table *table, int write,
2279 void __user *buffer, size_t *lenp, loff_t *ppos)
2280{
2281 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2282 do_proc_douintvec_conv, NULL);
1da177e4
LT		 2283}
2284
34f5a398 2285/*
25ddbb18
AK		 2286 * Taint values can only be increased
2287 * This means we can safely use a temporary.
34f5a398 2288 */
8d65af78 2289static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2290 void __user *buffer, size_t *lenp, loff_t *ppos)
2291{
25ddbb18
AK		 2292 struct ctl_table t;
2293 unsigned long tmptaint = get_taint();
2294 int err;
34f5a398 2295
91fcd412 2296 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2297 return -EPERM;
2298
25ddbb18
AK		 2299 t = *table;
2300 t.data = &tmptaint;
8d65af78 2301 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2302 if (err < 0)
2303 return err;
2304
2305 if (write) {
2306 /*
2307 * Poor man's atomic or. Not worth adding a primitive
2308 * to everyone's atomic.h for this
2309 */
2310 int i;
2311 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2312 if ((tmptaint >> i) & 1)
373d4d09 2313 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2314 }
2315 }
2316
2317 return err;
34f5a398
TT		 2318}
2319
bfdc0b49 2320#ifdef CONFIG_PRINTK
620f6e8e 2321static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2322 void __user *buffer, size_t *lenp, loff_t *ppos)
2323{
2324 if (write && !capable(CAP_SYS_ADMIN))
2325 return -EPERM;
2326
2327 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2328}
2329#endif
2330
1da177e4
LT		 2331struct do_proc_dointvec_minmax_conv_param {
2332 int *min;
2333 int *max;
2334};
2335
00b7c339
AW		 2336static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2337 int *valp,
1da177e4
LT		 2338 int write, void *data)
2339{
2340 struct do_proc_dointvec_minmax_conv_param *param = data;
2341 if (write) {
2342 int val = *negp ? -*lvalp : *lvalp;
2343 if ((param->min && *param->min > val) ||
2344 (param->max && *param->max < val))
2345 return -EINVAL;
2346 *valp = val;
2347 } else {
2348 int val = *valp;
2349 if (val < 0) {
00b7c339 2350 *negp = true;
9a5bc726 2351 *lvalp = -(unsigned long)val;
1da177e4 2352 } else {
00b7c339 2353 *negp = false;
1da177e4
LT		 2354 *lvalp = (unsigned long)val;
2355 }
2356 }
2357 return 0;
2358}
2359
2360/**
2361 * proc_dointvec_minmax - read a vector of integers with min/max values
2362 * @table: the sysctl table
2363 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2364 * @buffer: the user buffer
2365 * @lenp: the size of the user buffer
2366 * @ppos: file position
2367 *
2368 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2369 * values from/to the user buffer, treated as an ASCII string.
2370 *
2371 * This routine will ensure the values are within the range specified by
2372 * table->extra1 (min) and table->extra2 (max).
2373 *
2374 * Returns 0 on success.
2375 */
8d65af78 2376int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2377 void __user *buffer, size_t *lenp, loff_t *ppos)
2378{
2379 struct do_proc_dointvec_minmax_conv_param param = {
2380 .min = (int *) table->extra1,
2381 .max = (int *) table->extra2,
2382 };
8d65af78 2383 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2384 do_proc_dointvec_minmax_conv, &param);
2385}
2386
54b50199
KC		 2387static void validate_coredump_safety(void)
2388{
046d662f 2389#ifdef CONFIG_COREDUMP
e579d2c2 2390 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199 2391 core_pattern[0] != '/' && core_pattern[0] != '|') {
760c6a91
AD		 2392 printk(KERN_WARNING
2393"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2394"Pipe handler or fully qualified core dump path required.\n"
2395"Set kernel.core_pattern before fs.suid_dumpable.\n"
2396 );
54b50199 2397 }
046d662f 2398#endif
54b50199
KC		 2399}
2400
2401static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2402 void __user *buffer, size_t *lenp, loff_t *ppos)
2403{
2404 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2405 if (!error)
2406 validate_coredump_safety();
2407 return error;
2408}
2409
046d662f 2410#ifdef CONFIG_COREDUMP
54b50199
KC		 2411static int proc_dostring_coredump(struct ctl_table *table, int write,
2412 void __user *buffer, size_t *lenp, loff_t *ppos)
2413{
2414 int error = proc_dostring(table, write, buffer, lenp, ppos);
2415 if (!error)
2416 validate_coredump_safety();
2417 return error;
2418}
046d662f 2419#endif
54b50199 2420
d8217f07 2421static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2422 void __user *buffer,
2423 size_t *lenp, loff_t *ppos,
2424 unsigned long convmul,
2425 unsigned long convdiv)
2426{
00b7c339
AW		 2427 unsigned long *i, *min, *max;
2428 int vleft, first = 1, err = 0;
00b7c339 2429 size_t left;
70f6cbb6 2430 char *kbuf = NULL, *p;
00b7c339
AW		 2431
2432 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2433 *lenp = 0;
2434 return 0;
2435 }
00b7c339 2436
fcfbd547 2437 i = (unsigned long *) data;
1da177e4
LT		 2438 min = (unsigned long *) table->extra1;
2439 max = (unsigned long *) table->extra2;
2440 vleft = table->maxlen / sizeof(unsigned long);
2441 left = *lenp;
00b7c339
AW		 2442
2443 if (write) {
f4aacea2
KC		 2444 if (*ppos) {
2445 switch (sysctl_writes_strict) {
2446 case SYSCTL_WRITES_STRICT:
2447 goto out;
2448 case SYSCTL_WRITES_WARN:
2449 warn_sysctl_write(table);
2450 break;
2451 default:
2452 break;
2453 }
2454 }
2455
00b7c339
AW		 2456 if (left > PAGE_SIZE - 1)
2457 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2458 p = kbuf = memdup_user_nul(buffer, left);
2459 if (IS_ERR(kbuf))
2460 return PTR_ERR(kbuf);
00b7c339
AW		 2461 }
2462
27b3d80a 2463 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2464 unsigned long val;
2465
1da177e4 2466 if (write) {
00b7c339
AW		 2467 bool neg;
2468
70f6cbb6 2469 left -= proc_skip_spaces(&p);
00b7c339 2470
70f6cbb6 2471 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2472 proc_wspace_sep,
2473 sizeof(proc_wspace_sep), NULL);
2474 if (err)
1da177e4
LT		 2475 break;
2476 if (neg)
1da177e4 2477 continue;
ff9f8a7c 2478 val = convmul * val / convdiv;
1da177e4
LT		 2479 if ((min && val < *min) || (max && val > *max))
2480 continue;
2481 *i = val;
2482 } else {
00b7c339 2483 val = convdiv * (*i) / convmul;
7833819d 2484 if (!first) {
00b7c339 2485 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2486 if (err)
2487 break;
2488 }
00b7c339
AW		 2489 err = proc_put_long(&buffer, &left, val, false);
2490 if (err)
2491 break;
1da177e4
LT		 2492 }
2493 }
2494
00b7c339
AW		 2495 if (!write && !first && left && !err)
2496 err = proc_put_char(&buffer, &left, '\n');
2497 if (write && !err)
70f6cbb6 2498 left -= proc_skip_spaces(&p);
1da177e4 2499 if (write) {
70f6cbb6 2500 kfree(kbuf);
00b7c339
AW		 2501 if (first)
2502 return err ? : -EINVAL;
1da177e4 2503 }
1da177e4 2504 *lenp -= left;
f4aacea2 2505out:
1da177e4 2506 *ppos += *lenp;
00b7c339 2507 return err;
1da177e4
LT		 2508}
2509
d8217f07 2510static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2511 void __user *buffer,
2512 size_t *lenp, loff_t *ppos,
2513 unsigned long convmul,
2514 unsigned long convdiv)
2515{
2516 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2517 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2518}
2519
1da177e4
LT		 2520/**
2521 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2522 * @table: the sysctl table
2523 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2524 * @buffer: the user buffer
2525 * @lenp: the size of the user buffer
2526 * @ppos: file position
2527 *
2528 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2529 * values from/to the user buffer, treated as an ASCII string.
2530 *
2531 * This routine will ensure the values are within the range specified by
2532 * table->extra1 (min) and table->extra2 (max).
2533 *
2534 * Returns 0 on success.
2535 */
8d65af78 2536int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2537 void __user *buffer, size_t *lenp, loff_t *ppos)
2538{
8d65af78 2539 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2540}
2541
2542/**
2543 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2544 * @table: the sysctl table
2545 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2546 * @buffer: the user buffer
2547 * @lenp: the size of the user buffer
2548 * @ppos: file position
2549 *
2550 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2551 * values from/to the user buffer, treated as an ASCII string. The values
2552 * are treated as milliseconds, and converted to jiffies when they are stored.
2553 *
2554 * This routine will ensure the values are within the range specified by
2555 * table->extra1 (min) and table->extra2 (max).
2556 *
2557 * Returns 0 on success.
2558 */
d8217f07 2559int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2560 void __user *buffer,
2561 size_t *lenp, loff_t *ppos)
2562{
8d65af78 2563 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2564 lenp, ppos, HZ, 1000l);
2565}
2566
2567
00b7c339 2568static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2569 int *valp,
2570 int write, void *data)
2571{
2572 if (write) {
cba9f33d
BS		 2573 if (*lvalp > LONG_MAX / HZ)
2574 return 1;
1da177e4
LT		 2575 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2576 } else {
2577 int val = *valp;
2578 unsigned long lval;
2579 if (val < 0) {
00b7c339 2580 *negp = true;
9a5bc726 2581 lval = -(unsigned long)val;
1da177e4 2582 } else {
00b7c339 2583 *negp = false;
1da177e4
LT		 2584 lval = (unsigned long)val;
2585 }
2586 *lvalp = lval / HZ;
2587 }
2588 return 0;
2589}
2590
00b7c339 2591static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2592 int *valp,
2593 int write, void *data)
2594{
2595 if (write) {
cba9f33d
BS		 2596 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2597 return 1;
1da177e4
LT		 2598 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2599 } else {
2600 int val = *valp;
2601 unsigned long lval;
2602 if (val < 0) {
00b7c339 2603 *negp = true;
9a5bc726 2604 lval = -(unsigned long)val;
1da177e4 2605 } else {
00b7c339 2606 *negp = false;
1da177e4
LT		 2607 lval = (unsigned long)val;
2608 }
2609 *lvalp = jiffies_to_clock_t(lval);
2610 }
2611 return 0;
2612}
2613
00b7c339 2614static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2615 int *valp,
2616 int write, void *data)
2617{
2618 if (write) {
d738ce8f
FF		 2619 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2620
2621 if (jif > INT_MAX)
2622 return 1;
2623 *valp = (int)jif;
1da177e4
LT		 2624 } else {
2625 int val = *valp;
2626 unsigned long lval;
2627 if (val < 0) {
00b7c339 2628 *negp = true;
9a5bc726 2629 lval = -(unsigned long)val;
1da177e4 2630 } else {
00b7c339 2631 *negp = false;
1da177e4
LT		 2632 lval = (unsigned long)val;
2633 }
2634 *lvalp = jiffies_to_msecs(lval);
2635 }
2636 return 0;
2637}
2638
2639/**
2640 * proc_dointvec_jiffies - read a vector of integers as seconds
2641 * @table: the sysctl table
2642 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2643 * @buffer: the user buffer
2644 * @lenp: the size of the user buffer
2645 * @ppos: file position
2646 *
2647 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2648 * values from/to the user buffer, treated as an ASCII string.
2649 * The values read are assumed to be in seconds, and are converted into
2650 * jiffies.
2651 *
2652 * Returns 0 on success.
2653 */
8d65af78 2654int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2655 void __user *buffer, size_t *lenp, loff_t *ppos)
2656{
8d65af78 2657 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2658 do_proc_dointvec_jiffies_conv,NULL);
2659}
2660
2661/**
2662 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2663 * @table: the sysctl table
2664 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2665 * @buffer: the user buffer
2666 * @lenp: the size of the user buffer
1e5d5331 2667 * @ppos: pointer to the file position
1da177e4
LT		 2668 *
2669 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2670 * values from/to the user buffer, treated as an ASCII string.
2671 * The values read are assumed to be in 1/USER_HZ seconds, and
2672 * are converted into jiffies.
2673 *
2674 * Returns 0 on success.
2675 */
8d65af78 2676int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2677 void __user *buffer, size_t *lenp, loff_t *ppos)
2678{
8d65af78 2679 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2680 do_proc_dointvec_userhz_jiffies_conv,NULL);
2681}
2682
2683/**
2684 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2685 * @table: the sysctl table
2686 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2687 * @buffer: the user buffer
2688 * @lenp: the size of the user buffer
67be2dd1
MW		 2689 * @ppos: file position
2690 * @ppos: the current position in the file
1da177e4
LT		 2691 *
2692 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2693 * values from/to the user buffer, treated as an ASCII string.
2694 * The values read are assumed to be in 1/1000 seconds, and
2695 * are converted into jiffies.
2696 *
2697 * Returns 0 on success.
2698 */
8d65af78 2699int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701{
8d65af78 2702 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2703 do_proc_dointvec_ms_jiffies_conv, NULL);
2704}
2705
8d65af78 2706static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2707 void __user *buffer, size_t *lenp, loff_t *ppos)
2708{
2709 struct pid *new_pid;
2710 pid_t tmp;
2711 int r;
2712
6c5f3e7b 2713 tmp = pid_vnr(cad_pid);
9ec52099 2714
8d65af78 2715 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2716 lenp, ppos, NULL, NULL);
2717 if (r || !write)
2718 return r;
2719
2720 new_pid = find_get_pid(tmp);
2721 if (!new_pid)
2722 return -ESRCH;
2723
2724 put_pid(xchg(&cad_pid, new_pid));
2725 return 0;
2726}
2727
9f977fb7
OP		 2728/**
2729 * proc_do_large_bitmap - read/write from/to a large bitmap
2730 * @table: the sysctl table
2731 * @write: %TRUE if this is a write to the sysctl file
2732 * @buffer: the user buffer
2733 * @lenp: the size of the user buffer
2734 * @ppos: file position
2735 *
2736 * The bitmap is stored at table->data and the bitmap length (in bits)
2737 * in table->maxlen.
2738 *
2739 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2740 * large bitmaps may be represented in a compact manner. Writing into
2741 * the file will clear the bitmap then update it with the given input.
2742 *
2743 * Returns 0 on success.
2744 */
2745int proc_do_large_bitmap(struct ctl_table *table, int write,
2746 void __user *buffer, size_t *lenp, loff_t *ppos)
2747{
2748 int err = 0;
2749 bool first = 1;
2750 size_t left = *lenp;
2751 unsigned long bitmap_len = table->maxlen;
122ff243 2752 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2753 unsigned long *tmp_bitmap = NULL;
2754 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2755
122ff243 2756 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2757 *lenp = 0;
2758 return 0;
2759 }
2760
2761 if (write) {
70f6cbb6 2762 char *kbuf, *p;
9f977fb7
OP		 2763
2764 if (left > PAGE_SIZE - 1)
2765 left = PAGE_SIZE - 1;
2766
70f6cbb6
AV		 2767 p = kbuf = memdup_user_nul(buffer, left);
2768 if (IS_ERR(kbuf))
2769 return PTR_ERR(kbuf);
9f977fb7
OP		 2770
2771 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2772 GFP_KERNEL);
2773 if (!tmp_bitmap) {
70f6cbb6 2774 kfree(kbuf);
9f977fb7
OP		 2775 return -ENOMEM;
2776 }
70f6cbb6 2777 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 2778 while (!err && left) {
2779 unsigned long val_a, val_b;
2780 bool neg;
2781
70f6cbb6 2782 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 2783 sizeof(tr_a), &c);
2784 if (err)
2785 break;
2786 if (val_a >= bitmap_len || neg) {
2787 err = -EINVAL;
2788 break;
2789 }
2790
2791 val_b = val_a;
2792 if (left) {
70f6cbb6 2793 p++;
9f977fb7
OP		 2794 left--;
2795 }
2796
2797 if (c == '-') {
70f6cbb6 2798 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 2799 &neg, tr_b, sizeof(tr_b),
2800 &c);
2801 if (err)
2802 break;
2803 if (val_b >= bitmap_len || neg ||
2804 val_a > val_b) {
2805 err = -EINVAL;
2806 break;
2807 }
2808 if (left) {
70f6cbb6 2809 p++;
9f977fb7
OP		 2810 left--;
2811 }
2812 }
2813
5a04cca6 2814 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 2815 first = 0;
70f6cbb6 2816 proc_skip_char(&p, &left, '\n');
9f977fb7 2817 }
70f6cbb6 2818 kfree(kbuf);
9f977fb7
OP		 2819 } else {
2820 unsigned long bit_a, bit_b = 0;
2821
2822 while (left) {
2823 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2824 if (bit_a >= bitmap_len)
2825 break;
2826 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2827 bit_a + 1) - 1;
2828
2829 if (!first) {
2830 err = proc_put_char(&buffer, &left, ',');
2831 if (err)
2832 break;
2833 }
2834 err = proc_put_long(&buffer, &left, bit_a, false);
2835 if (err)
2836 break;
2837 if (bit_a != bit_b) {
2838 err = proc_put_char(&buffer, &left, '-');
2839 if (err)
2840 break;
2841 err = proc_put_long(&buffer, &left, bit_b, false);
2842 if (err)
2843 break;
2844 }
2845
2846 first = 0; bit_b++;
2847 }
2848 if (!err)
2849 err = proc_put_char(&buffer, &left, '\n');
2850 }
2851
2852 if (!err) {
2853 if (write) {
2854 if (*ppos)
2855 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2856 else
5a04cca6 2857 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 2858 }
2859 kfree(tmp_bitmap);
2860 *lenp -= left;
2861 *ppos += *lenp;
2862 return 0;
2863 } else {
2864 kfree(tmp_bitmap);
2865 return err;
2866 }
2867}
2868
55610500 2869#else /* CONFIG_PROC_SYSCTL */
1da177e4 2870
8d65af78 2871int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2872 void __user *buffer, size_t *lenp, loff_t *ppos)
2873{
2874 return -ENOSYS;
2875}
2876
8d65af78 2877int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2878 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2879{
2880 return -ENOSYS;
2881}
2882
e7d316a0
SAK		 2883int proc_douintvec(struct ctl_table *table, int write,
2884 void __user *buffer, size_t *lenp, loff_t *ppos)
2885{
2886 return -ENOSYS;
2887}
2888
8d65af78 2889int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2890 void __user *buffer, size_t *lenp, loff_t *ppos)
2891{
2892 return -ENOSYS;
2893}
2894
8d65af78 2895int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2896 void __user *buffer, size_t *lenp, loff_t *ppos)
2897{
2898 return -ENOSYS;
2899}
2900
8d65af78 2901int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2902 void __user *buffer, size_t *lenp, loff_t *ppos)
2903{
2904 return -ENOSYS;
2905}
2906
8d65af78 2907int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2908 void __user *buffer, size_t *lenp, loff_t *ppos)
2909{
2910 return -ENOSYS;
2911}
2912
8d65af78 2913int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2914 void __user *buffer, size_t *lenp, loff_t *ppos)
2915{
2916 return -ENOSYS;
2917}
2918
d8217f07 2919int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2920 void __user *buffer,
2921 size_t *lenp, loff_t *ppos)
2922{
2923 return -ENOSYS;
2924}
2925
2926
55610500 2927#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2928
1da177e4
LT		 2929/*
2930 * No sense putting this after each symbol definition, twice,
2931 * exception granted :-)
2932 */
2933EXPORT_SYMBOL(proc_dointvec);
e7d316a0 2934EXPORT_SYMBOL(proc_douintvec);
1da177e4
LT		 2935EXPORT_SYMBOL(proc_dointvec_jiffies);
2936EXPORT_SYMBOL(proc_dointvec_minmax);
2937EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2938EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2939EXPORT_SYMBOL(proc_dostring);
2940EXPORT_SYMBOL(proc_doulongvec_minmax);
2941EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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