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Merge tag 'pm+acpi-4.6-rc1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael...
[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;
af91322e
DY		 129#ifdef CONFIG_PRINTK
130static int ten_thousand = 10000;
131#endif
c4f3b63f 132
9e4a5bda
AR		 133/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135
1da177e4
LT		 136/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137static int maxolduid = 65535;
138static int minolduid;
139
140static int ngroups_max = NGROUPS_MAX;
73efc039 141static const int cap_last_cap = CAP_LAST_CAP;
1da177e4 142
80df2847
LH		 143/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
144#ifdef CONFIG_DETECT_HUNG_TASK
145static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
146#endif
147
d14f1729
DY		 148#ifdef CONFIG_INOTIFY_USER
149#include <linux/inotify.h>
150#endif
72c57ed5 151#ifdef CONFIG_SPARC
1da177e4
LT		 152#endif
153
154#ifdef __hppa__
155extern int pwrsw_enabled;
bf14e3b9
VG		 156#endif
157
158#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4
LT		 159extern int unaligned_enabled;
160#endif
1da177e4 161
d2b176ed 162#ifdef CONFIG_IA64
88fc241f 163extern int unaligned_dump_stack;
d2b176ed
JS		 164#endif
165
b6fca725
VG		 166#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167extern int no_unaligned_warning;
168#endif
169
d6f8ff73 170#ifdef CONFIG_PROC_SYSCTL
f4aacea2
KC		 171
172#define SYSCTL_WRITES_LEGACY -1
173#define SYSCTL_WRITES_WARN 0
174#define SYSCTL_WRITES_STRICT 1
175
41662f5c 176static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
f4aacea2 177
8d65af78 178static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 179 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 180static int proc_taint(struct ctl_table *table, int write,
34f5a398 181 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 182#endif
9ec52099 183
bfdc0b49 184#ifdef CONFIG_PRINTK
620f6e8e 185static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 186 void __user *buffer, size_t *lenp, loff_t *ppos);
187#endif
188
54b50199
KC		 189static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 191#ifdef CONFIG_COREDUMP
54b50199
KC		 192static int proc_dostring_coredump(struct ctl_table *table, int write,
193 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 194#endif
54b50199 195
97f5f0cd 196#ifdef CONFIG_MAGIC_SYSRQ
8c6a98b2 197/* Note: sysrq code uses it's own private copy */
8eaede49 198static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
97f5f0cd 199
6f8fd1d7 200static int sysrq_sysctl_handler(struct ctl_table *table, int write,
97f5f0cd
DT		 201 void __user *buffer, size_t *lenp,
202 loff_t *ppos)
203{
204 int error;
205
206 error = proc_dointvec(table, write, buffer, lenp, ppos);
207 if (error)
208 return error;
209
210 if (write)
211 sysrq_toggle_support(__sysrq_enabled);
212
213 return 0;
214}
215
216#endif
217
d8217f07
EB		 218static struct ctl_table kern_table[];
219static struct ctl_table vm_table[];
220static struct ctl_table fs_table[];
221static struct ctl_table debug_table[];
222static struct ctl_table dev_table[];
223extern struct ctl_table random_table[];
7ef9964e
DL		 224#ifdef CONFIG_EPOLL
225extern struct ctl_table epoll_table[];
226#endif
1da177e4
LT		 227
228#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
229int sysctl_legacy_va_layout;
230#endif
231
1da177e4
LT		 232/* The default sysctl tables: */
233
de4e83bd 234static struct ctl_table sysctl_base_table[] = {
1da177e4 235 {
1da177e4
LT		 236 .procname = "kernel",
237 .mode = 0555,
238 .child = kern_table,
239 },
240 {
1da177e4
LT		 241 .procname = "vm",
242 .mode = 0555,
243 .child = vm_table,
244 },
1da177e4 245 {
1da177e4
LT		 246 .procname = "fs",
247 .mode = 0555,
248 .child = fs_table,
249 },
250 {
1da177e4
LT		 251 .procname = "debug",
252 .mode = 0555,
253 .child = debug_table,
254 },
255 {
1da177e4
LT		 256 .procname = "dev",
257 .mode = 0555,
258 .child = dev_table,
259 },
6fce56ec 260 { }
1da177e4
LT		 261};
262
77e54a1f 263#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 264static int min_sched_granularity_ns = 100000; /* 100 usecs */
265static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
266static int min_wakeup_granularity_ns; /* 0 usecs */
267static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
cbee9f88 268#ifdef CONFIG_SMP
1983a922
CE		 269static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
270static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
cbee9f88
PZ		 271#endif /* CONFIG_SMP */
272#endif /* CONFIG_SCHED_DEBUG */
77e54a1f 273
5e771905
MG		 274#ifdef CONFIG_COMPACTION
275static int min_extfrag_threshold;
276static int max_extfrag_threshold = 1000;
277#endif
278
d8217f07 279static struct ctl_table kern_table[] = {
2bba22c5 280 {
2bba22c5
MG		 281 .procname = "sched_child_runs_first",
282 .data = &sysctl_sched_child_runs_first,
283 .maxlen = sizeof(unsigned int),
284 .mode = 0644,
6d456111 285 .proc_handler = proc_dointvec,
2bba22c5 286 },
77e54a1f
IM		 287#ifdef CONFIG_SCHED_DEBUG
288 {
b2be5e96
PZ		 289 .procname = "sched_min_granularity_ns",
290 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 291 .maxlen = sizeof(unsigned int),
292 .mode = 0644,
702a7c76 293 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 294 .extra1 = &min_sched_granularity_ns,
295 .extra2 = &max_sched_granularity_ns,
77e54a1f 296 },
21805085 297 {
21805085
PZ		 298 .procname = "sched_latency_ns",
299 .data = &sysctl_sched_latency,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
702a7c76 302 .proc_handler = sched_proc_update_handler,
21805085
PZ		 303 .extra1 = &min_sched_granularity_ns,
304 .extra2 = &max_sched_granularity_ns,
305 },
77e54a1f 306 {
77e54a1f
IM		 307 .procname = "sched_wakeup_granularity_ns",
308 .data = &sysctl_sched_wakeup_granularity,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
702a7c76 311 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 312 .extra1 = &min_wakeup_granularity_ns,
313 .extra2 = &max_wakeup_granularity_ns,
314 },
cbee9f88 315#ifdef CONFIG_SMP
1983a922 316 {
1983a922
CE		 317 .procname = "sched_tunable_scaling",
318 .data = &sysctl_sched_tunable_scaling,
319 .maxlen = sizeof(enum sched_tunable_scaling),
320 .mode = 0644,
702a7c76 321 .proc_handler = sched_proc_update_handler,
1983a922
CE		 322 .extra1 = &min_sched_tunable_scaling,
323 .extra2 = &max_sched_tunable_scaling,
2398f2c6 324 },
da84d961 325 {
d00535db 326 .procname = "sched_migration_cost_ns",
da84d961
IM		 327 .data = &sysctl_sched_migration_cost,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
6d456111 330 .proc_handler = proc_dointvec,
da84d961 331 },
b82d9fdd 332 {
b82d9fdd
PZ		 333 .procname = "sched_nr_migrate",
334 .data = &sysctl_sched_nr_migrate,
335 .maxlen = sizeof(unsigned int),
fa85ae24 336 .mode = 0644,
6d456111 337 .proc_handler = proc_dointvec,
fa85ae24 338 },
e9e9250b 339 {
d00535db 340 .procname = "sched_time_avg_ms",
e9e9250b
PZ		 341 .data = &sysctl_sched_time_avg,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
6d456111 344 .proc_handler = proc_dointvec,
e9e9250b 345 },
a7a4f8a7 346 {
d00535db 347 .procname = "sched_shares_window_ns",
a7a4f8a7
PT		 348 .data = &sysctl_sched_shares_window,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec,
352 },
cb251765
MG		 353#ifdef CONFIG_SCHEDSTATS
354 {
355 .procname = "sched_schedstats",
356 .data = NULL,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
359 .proc_handler = sysctl_schedstats,
360 .extra1 = &zero,
361 .extra2 = &one,
362 },
363#endif /* CONFIG_SCHEDSTATS */
cbee9f88
PZ		 364#endif /* CONFIG_SMP */
365#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 366 {
367 .procname = "numa_balancing_scan_delay_ms",
368 .data = &sysctl_numa_balancing_scan_delay,
369 .maxlen = sizeof(unsigned int),
370 .mode = 0644,
371 .proc_handler = proc_dointvec,
372 },
cbee9f88
PZ		 373 {
374 .procname = "numa_balancing_scan_period_min_ms",
375 .data = &sysctl_numa_balancing_scan_period_min,
376 .maxlen = sizeof(unsigned int),
377 .mode = 0644,
378 .proc_handler = proc_dointvec,
379 },
380 {
381 .procname = "numa_balancing_scan_period_max_ms",
382 .data = &sysctl_numa_balancing_scan_period_max,
383 .maxlen = sizeof(unsigned int),
384 .mode = 0644,
385 .proc_handler = proc_dointvec,
386 },
6e5fb223
PZ		 387 {
388 .procname = "numa_balancing_scan_size_mb",
389 .data = &sysctl_numa_balancing_scan_size,
390 .maxlen = sizeof(unsigned int),
391 .mode = 0644,
64192658
KT		 392 .proc_handler = proc_dointvec_minmax,
393 .extra1 = &one,
6e5fb223 394 },
54a43d54
AK		 395 {
396 .procname = "numa_balancing",
397 .data = NULL, /* filled in by handler */
398 .maxlen = sizeof(unsigned int),
399 .mode = 0644,
400 .proc_handler = sysctl_numa_balancing,
401 .extra1 = &zero,
402 .extra2 = &one,
403 },
cbee9f88
PZ		 404#endif /* CONFIG_NUMA_BALANCING */
405#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 406 {
9f0c1e56
PZ		 407 .procname = "sched_rt_period_us",
408 .data = &sysctl_sched_rt_period,
409 .maxlen = sizeof(unsigned int),
410 .mode = 0644,
6d456111 411 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 412 },
413 {
9f0c1e56
PZ		 414 .procname = "sched_rt_runtime_us",
415 .data = &sysctl_sched_rt_runtime,
416 .maxlen = sizeof(int),
417 .mode = 0644,
6d456111 418 .proc_handler = sched_rt_handler,
9f0c1e56 419 },
ce0dbbbb
CW		 420 {
421 .procname = "sched_rr_timeslice_ms",
422 .data = &sched_rr_timeslice,
423 .maxlen = sizeof(int),
424 .mode = 0644,
425 .proc_handler = sched_rr_handler,
426 },
5091faa4
MG		 427#ifdef CONFIG_SCHED_AUTOGROUP
428 {
429 .procname = "sched_autogroup_enabled",
430 .data = &sysctl_sched_autogroup_enabled,
431 .maxlen = sizeof(unsigned int),
432 .mode = 0644,
1747b21f 433 .proc_handler = proc_dointvec_minmax,
5091faa4
MG		 434 .extra1 = &zero,
435 .extra2 = &one,
436 },
437#endif
ec12cb7f
PT		 438#ifdef CONFIG_CFS_BANDWIDTH
439 {
440 .procname = "sched_cfs_bandwidth_slice_us",
441 .data = &sysctl_sched_cfs_bandwidth_slice,
442 .maxlen = sizeof(unsigned int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec_minmax,
445 .extra1 = &one,
446 },
447#endif
f20786ff
PZ		 448#ifdef CONFIG_PROVE_LOCKING
449 {
f20786ff
PZ		 450 .procname = "prove_locking",
451 .data = &prove_locking,
452 .maxlen = sizeof(int),
453 .mode = 0644,
6d456111 454 .proc_handler = proc_dointvec,
f20786ff
PZ		 455 },
456#endif
457#ifdef CONFIG_LOCK_STAT
458 {
f20786ff
PZ		 459 .procname = "lock_stat",
460 .data = &lock_stat,
461 .maxlen = sizeof(int),
462 .mode = 0644,
6d456111 463 .proc_handler = proc_dointvec,
f20786ff 464 },
77e54a1f 465#endif
1da177e4 466 {
1da177e4
LT		 467 .procname = "panic",
468 .data = &panic_timeout,
469 .maxlen = sizeof(int),
470 .mode = 0644,
6d456111 471 .proc_handler = proc_dointvec,
1da177e4 472 },
046d662f 473#ifdef CONFIG_COREDUMP
1da177e4 474 {
1da177e4
LT		 475 .procname = "core_uses_pid",
476 .data = &core_uses_pid,
477 .maxlen = sizeof(int),
478 .mode = 0644,
6d456111 479 .proc_handler = proc_dointvec,
1da177e4
LT		 480 },
481 {
1da177e4
LT		 482 .procname = "core_pattern",
483 .data = core_pattern,
71ce92f3 484 .maxlen = CORENAME_MAX_SIZE,
1da177e4 485 .mode = 0644,
54b50199 486 .proc_handler = proc_dostring_coredump,
1da177e4 487 },
a293980c 488 {
a293980c
NH		 489 .procname = "core_pipe_limit",
490 .data = &core_pipe_limit,
491 .maxlen = sizeof(unsigned int),
492 .mode = 0644,
6d456111 493 .proc_handler = proc_dointvec,
a293980c 494 },
046d662f 495#endif
34f5a398 496#ifdef CONFIG_PROC_SYSCTL
1da177e4 497 {
1da177e4 498 .procname = "tainted",
25ddbb18 499 .maxlen = sizeof(long),
34f5a398 500 .mode = 0644,
6d456111 501 .proc_handler = proc_taint,
1da177e4 502 },
f4aacea2
KC		 503 {
504 .procname = "sysctl_writes_strict",
505 .data = &sysctl_writes_strict,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec_minmax,
509 .extra1 = &neg_one,
510 .extra2 = &one,
511 },
34f5a398 512#endif
9745512c
AV		 513#ifdef CONFIG_LATENCYTOP
514 {
515 .procname = "latencytop",
516 .data = &latencytop_enabled,
517 .maxlen = sizeof(int),
518 .mode = 0644,
cb251765 519 .proc_handler = sysctl_latencytop,
9745512c
AV		 520 },
521#endif
1da177e4
LT		 522#ifdef CONFIG_BLK_DEV_INITRD
523 {
1da177e4
LT		 524 .procname = "real-root-dev",
525 .data = &real_root_dev,
526 .maxlen = sizeof(int),
527 .mode = 0644,
6d456111 528 .proc_handler = proc_dointvec,
1da177e4
LT		 529 },
530#endif
45807a1d 531 {
45807a1d
IM		 532 .procname = "print-fatal-signals",
533 .data = &print_fatal_signals,
534 .maxlen = sizeof(int),
535 .mode = 0644,
6d456111 536 .proc_handler = proc_dointvec,
45807a1d 537 },
72c57ed5 538#ifdef CONFIG_SPARC
1da177e4 539 {
1da177e4
LT		 540 .procname = "reboot-cmd",
541 .data = reboot_command,
542 .maxlen = 256,
543 .mode = 0644,
6d456111 544 .proc_handler = proc_dostring,
1da177e4
LT		 545 },
546 {
1da177e4
LT		 547 .procname = "stop-a",
548 .data = &stop_a_enabled,
549 .maxlen = sizeof (int),
550 .mode = 0644,
6d456111 551 .proc_handler = proc_dointvec,
1da177e4
LT		 552 },
553 {
1da177e4
LT		 554 .procname = "scons-poweroff",
555 .data = &scons_pwroff,
556 .maxlen = sizeof (int),
557 .mode = 0644,
6d456111 558 .proc_handler = proc_dointvec,
1da177e4
LT		 559 },
560#endif
0871420f
DM		 561#ifdef CONFIG_SPARC64
562 {
0871420f
DM		 563 .procname = "tsb-ratio",
564 .data = &sysctl_tsb_ratio,
565 .maxlen = sizeof (int),
566 .mode = 0644,
6d456111 567 .proc_handler = proc_dointvec,
0871420f
DM		 568 },
569#endif
1da177e4
LT		 570#ifdef __hppa__
571 {
1da177e4
LT		 572 .procname = "soft-power",
573 .data = &pwrsw_enabled,
574 .maxlen = sizeof (int),
575 .mode = 0644,
6d456111 576 .proc_handler = proc_dointvec,
1da177e4 577 },
bf14e3b9
VG		 578#endif
579#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 580 {
1da177e4
LT		 581 .procname = "unaligned-trap",
582 .data = &unaligned_enabled,
583 .maxlen = sizeof (int),
584 .mode = 0644,
6d456111 585 .proc_handler = proc_dointvec,
1da177e4
LT		 586 },
587#endif
588 {
1da177e4
LT		 589 .procname = "ctrl-alt-del",
590 .data = &C_A_D,
591 .maxlen = sizeof(int),
592 .mode = 0644,
6d456111 593 .proc_handler = proc_dointvec,
1da177e4 594 },
606576ce 595#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 596 {
b0fc494f
SR		 597 .procname = "ftrace_enabled",
598 .data = &ftrace_enabled,
599 .maxlen = sizeof(int),
600 .mode = 0644,
6d456111 601 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 602 },
603#endif
f38f1d2a
SR		 604#ifdef CONFIG_STACK_TRACER
605 {
f38f1d2a
SR		 606 .procname = "stack_tracer_enabled",
607 .data = &stack_tracer_enabled,
608 .maxlen = sizeof(int),
609 .mode = 0644,
6d456111 610 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 611 },
612#endif
944ac425
SR		 613#ifdef CONFIG_TRACING
614 {
3299b4dd 615 .procname = "ftrace_dump_on_oops",
944ac425
SR		 616 .data = &ftrace_dump_on_oops,
617 .maxlen = sizeof(int),
618 .mode = 0644,
6d456111 619 .proc_handler = proc_dointvec,
944ac425 620 },
de7edd31
SRRH		 621 {
622 .procname = "traceoff_on_warning",
623 .data = &__disable_trace_on_warning,
624 .maxlen = sizeof(__disable_trace_on_warning),
625 .mode = 0644,
626 .proc_handler = proc_dointvec,
627 },
0daa2302
SRRH		 628 {
629 .procname = "tracepoint_printk",
630 .data = &tracepoint_printk,
631 .maxlen = sizeof(tracepoint_printk),
632 .mode = 0644,
633 .proc_handler = proc_dointvec,
634 },
944ac425 635#endif
2965faa5 636#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 637 {
638 .procname = "kexec_load_disabled",
639 .data = &kexec_load_disabled,
640 .maxlen = sizeof(int),
641 .mode = 0644,
642 /* only handle a transition from default "0" to "1" */
643 .proc_handler = proc_dointvec_minmax,
644 .extra1 = &one,
645 .extra2 = &one,
646 },
647#endif
a1ef5adb 648#ifdef CONFIG_MODULES
1da177e4 649 {
1da177e4
LT		 650 .procname = "modprobe",
651 .data = &modprobe_path,
652 .maxlen = KMOD_PATH_LEN,
653 .mode = 0644,
6d456111 654 .proc_handler = proc_dostring,
1da177e4 655 },
3d43321b 656 {
3d43321b
KC		 657 .procname = "modules_disabled",
658 .data = &modules_disabled,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 /* only handle a transition from default "0" to "1" */
6d456111 662 .proc_handler = proc_dointvec_minmax,
3d43321b
KC		 663 .extra1 = &one,
664 .extra2 = &one,
665 },
1da177e4 666#endif
86d56134 667#ifdef CONFIG_UEVENT_HELPER
1da177e4 668 {
1da177e4 669 .procname = "hotplug",
312c004d
KS		 670 .data = &uevent_helper,
671 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 672 .mode = 0644,
6d456111 673 .proc_handler = proc_dostring,
1da177e4 674 },
86d56134 675#endif
1da177e4
LT		 676#ifdef CONFIG_CHR_DEV_SG
677 {
1da177e4
LT		 678 .procname = "sg-big-buff",
679 .data = &sg_big_buff,
680 .maxlen = sizeof (int),
681 .mode = 0444,
6d456111 682 .proc_handler = proc_dointvec,
1da177e4
LT		 683 },
684#endif
685#ifdef CONFIG_BSD_PROCESS_ACCT
686 {
1da177e4
LT		 687 .procname = "acct",
688 .data = &acct_parm,
689 .maxlen = 3*sizeof(int),
690 .mode = 0644,
6d456111 691 .proc_handler = proc_dointvec,
1da177e4
LT		 692 },
693#endif
1da177e4
LT		 694#ifdef CONFIG_MAGIC_SYSRQ
695 {
1da177e4 696 .procname = "sysrq",
5d6f647f 697 .data = &__sysrq_enabled,
1da177e4
LT		 698 .maxlen = sizeof (int),
699 .mode = 0644,
97f5f0cd 700 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 701 },
702#endif
d6f8ff73 703#ifdef CONFIG_PROC_SYSCTL
1da177e4 704 {
1da177e4 705 .procname = "cad_pid",
9ec52099 706 .data = NULL,
1da177e4
LT		 707 .maxlen = sizeof (int),
708 .mode = 0600,
6d456111 709 .proc_handler = proc_do_cad_pid,
1da177e4 710 },
d6f8ff73 711#endif
1da177e4 712 {
1da177e4 713 .procname = "threads-max",
16db3d3f 714 .data = NULL,
1da177e4
LT		 715 .maxlen = sizeof(int),
716 .mode = 0644,
16db3d3f 717 .proc_handler = sysctl_max_threads,
1da177e4
LT		 718 },
719 {
1da177e4
LT		 720 .procname = "random",
721 .mode = 0555,
722 .child = random_table,
723 },
17f60a7d
EP		 724 {
725 .procname = "usermodehelper",
726 .mode = 0555,
727 .child = usermodehelper_table,
728 },
1da177e4 729 {
1da177e4
LT		 730 .procname = "overflowuid",
731 .data = &overflowuid,
732 .maxlen = sizeof(int),
733 .mode = 0644,
6d456111 734 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 735 .extra1 = &minolduid,
736 .extra2 = &maxolduid,
737 },
738 {
1da177e4
LT		 739 .procname = "overflowgid",
740 .data = &overflowgid,
741 .maxlen = sizeof(int),
742 .mode = 0644,
6d456111 743 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 744 .extra1 = &minolduid,
745 .extra2 = &maxolduid,
746 },
347a8dc3 747#ifdef CONFIG_S390
1da177e4
LT		 748#ifdef CONFIG_MATHEMU
749 {
1da177e4
LT		 750 .procname = "ieee_emulation_warnings",
751 .data = &sysctl_ieee_emulation_warnings,
752 .maxlen = sizeof(int),
753 .mode = 0644,
6d456111 754 .proc_handler = proc_dointvec,
1da177e4 755 },
1da177e4
LT		 756#endif
757 {
1da177e4 758 .procname = "userprocess_debug",
ab3c68ee 759 .data = &show_unhandled_signals,
1da177e4
LT		 760 .maxlen = sizeof(int),
761 .mode = 0644,
6d456111 762 .proc_handler = proc_dointvec,
1da177e4
LT		 763 },
764#endif
765 {
1da177e4
LT		 766 .procname = "pid_max",
767 .data = &pid_max,
768 .maxlen = sizeof (int),
769 .mode = 0644,
6d456111 770 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 771 .extra1 = &pid_max_min,
772 .extra2 = &pid_max_max,
773 },
774 {
1da177e4
LT		 775 .procname = "panic_on_oops",
776 .data = &panic_on_oops,
777 .maxlen = sizeof(int),
778 .mode = 0644,
6d456111 779 .proc_handler = proc_dointvec,
1da177e4 780 },
7ef3d2fd
JP		 781#if defined CONFIG_PRINTK
782 {
7ef3d2fd
JP		 783 .procname = "printk",
784 .data = &console_loglevel,
785 .maxlen = 4*sizeof(int),
786 .mode = 0644,
6d456111 787 .proc_handler = proc_dointvec,
7ef3d2fd 788 },
1da177e4 789 {
1da177e4 790 .procname = "printk_ratelimit",
717115e1 791 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 792 .maxlen = sizeof(int),
793 .mode = 0644,
6d456111 794 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 795 },
796 {
1da177e4 797 .procname = "printk_ratelimit_burst",
717115e1 798 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 799 .maxlen = sizeof(int),
800 .mode = 0644,
6d456111 801 .proc_handler = proc_dointvec,
1da177e4 802 },
af91322e 803 {
af91322e
DY		 804 .procname = "printk_delay",
805 .data = &printk_delay_msec,
806 .maxlen = sizeof(int),
807 .mode = 0644,
6d456111 808 .proc_handler = proc_dointvec_minmax,
af91322e
DY		 809 .extra1 = &zero,
810 .extra2 = &ten_thousand,
811 },
eaf06b24
DR		 812 {
813 .procname = "dmesg_restrict",
814 .data = &dmesg_restrict,
815 .maxlen = sizeof(int),
816 .mode = 0644,
620f6e8e 817 .proc_handler = proc_dointvec_minmax_sysadmin,
eaf06b24
DR		 818 .extra1 = &zero,
819 .extra2 = &one,
820 },
455cd5ab
DR		 821 {
822 .procname = "kptr_restrict",
823 .data = &kptr_restrict,
824 .maxlen = sizeof(int),
825 .mode = 0644,
620f6e8e 826 .proc_handler = proc_dointvec_minmax_sysadmin,
455cd5ab
DR		 827 .extra1 = &zero,
828 .extra2 = &two,
829 },
df6e61d4 830#endif
1da177e4 831 {
1da177e4
LT		 832 .procname = "ngroups_max",
833 .data = &ngroups_max,
834 .maxlen = sizeof (int),
835 .mode = 0444,
6d456111 836 .proc_handler = proc_dointvec,
1da177e4 837 },
73efc039
DB		 838 {
839 .procname = "cap_last_cap",
840 .data = (void *)&cap_last_cap,
841 .maxlen = sizeof(int),
842 .mode = 0444,
843 .proc_handler = proc_dointvec,
844 },
58687acb 845#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 846 {
58687acb 847 .procname = "watchdog",
3c00ea82 848 .data = &watchdog_user_enabled,
504d7cf1
DZ		 849 .maxlen = sizeof (int),
850 .mode = 0644,
195daf66 851 .proc_handler = proc_watchdog,
586692a5
MSB		 852 .extra1 = &zero,
853 .extra2 = &one,
58687acb
DZ		 854 },
855 {
856 .procname = "watchdog_thresh",
586692a5 857 .data = &watchdog_thresh,
58687acb
DZ		 858 .maxlen = sizeof(int),
859 .mode = 0644,
195daf66 860 .proc_handler = proc_watchdog_thresh,
a6572f84 861 .extra1 = &zero,
58687acb 862 .extra2 = &sixty,
504d7cf1 863 },
195daf66
UO		 864 {
865 .procname = "nmi_watchdog",
866 .data = &nmi_watchdog_enabled,
867 .maxlen = sizeof (int),
868 .mode = 0644,
869 .proc_handler = proc_nmi_watchdog,
870 .extra1 = &zero,
871#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
872 .extra2 = &one,
873#else
874 .extra2 = &zero,
875#endif
876 },
877 {
878 .procname = "soft_watchdog",
879 .data = &soft_watchdog_enabled,
880 .maxlen = sizeof (int),
881 .mode = 0644,
882 .proc_handler = proc_soft_watchdog,
883 .extra1 = &zero,
884 .extra2 = &one,
885 },
fe4ba3c3
CM		 886 {
887 .procname = "watchdog_cpumask",
888 .data = &watchdog_cpumask_bits,
889 .maxlen = NR_CPUS,
890 .mode = 0644,
891 .proc_handler = proc_watchdog_cpumask,
892 },
2508ce18
DZ		 893 {
894 .procname = "softlockup_panic",
895 .data = &softlockup_panic,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec_minmax,
899 .extra1 = &zero,
900 .extra2 = &one,
901 },
ac1f5912
DZ		 902#ifdef CONFIG_HARDLOCKUP_DETECTOR
903 {
904 .procname = "hardlockup_panic",
905 .data = &hardlockup_panic,
906 .maxlen = sizeof(int),
907 .mode = 0644,
908 .proc_handler = proc_dointvec_minmax,
909 .extra1 = &zero,
910 .extra2 = &one,
911 },
912#endif
ed235875
AT		 913#ifdef CONFIG_SMP
914 {
915 .procname = "softlockup_all_cpu_backtrace",
916 .data = &sysctl_softlockup_all_cpu_backtrace,
917 .maxlen = sizeof(int),
918 .mode = 0644,
919 .proc_handler = proc_dointvec_minmax,
920 .extra1 = &zero,
921 .extra2 = &one,
922 },
55537871
JK		 923 {
924 .procname = "hardlockup_all_cpu_backtrace",
925 .data = &sysctl_hardlockup_all_cpu_backtrace,
926 .maxlen = sizeof(int),
927 .mode = 0644,
928 .proc_handler = proc_dointvec_minmax,
929 .extra1 = &zero,
930 .extra2 = &one,
931 },
ed235875 932#endif /* CONFIG_SMP */
5dc30558
DZ		 933#endif
934#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
935 {
936 .procname = "unknown_nmi_panic",
937 .data = &unknown_nmi_panic,
938 .maxlen = sizeof (int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec,
941 },
504d7cf1 942#endif
1da177e4 943#if defined(CONFIG_X86)
8da5adda 944 {
8da5adda
DZ		 945 .procname = "panic_on_unrecovered_nmi",
946 .data = &panic_on_unrecovered_nmi,
947 .maxlen = sizeof(int),
948 .mode = 0644,
6d456111 949 .proc_handler = proc_dointvec,
8da5adda 950 },
5211a242 951 {
5211a242
KG		 952 .procname = "panic_on_io_nmi",
953 .data = &panic_on_io_nmi,
954 .maxlen = sizeof(int),
955 .mode = 0644,
6d456111 956 .proc_handler = proc_dointvec,
5211a242 957 },
55af7796
MH		 958#ifdef CONFIG_DEBUG_STACKOVERFLOW
959 {
960 .procname = "panic_on_stackoverflow",
961 .data = &sysctl_panic_on_stackoverflow,
962 .maxlen = sizeof(int),
963 .mode = 0644,
964 .proc_handler = proc_dointvec,
965 },
966#endif
1da177e4 967 {
1da177e4
LT		 968 .procname = "bootloader_type",
969 .data = &bootloader_type,
970 .maxlen = sizeof (int),
971 .mode = 0444,
6d456111 972 .proc_handler = proc_dointvec,
1da177e4 973 },
5031296c 974 {
5031296c
PA		 975 .procname = "bootloader_version",
976 .data = &bootloader_version,
977 .maxlen = sizeof (int),
978 .mode = 0444,
6d456111 979 .proc_handler = proc_dointvec,
5031296c 980 },
0741f4d2 981 {
0741f4d2
CE		 982 .procname = "kstack_depth_to_print",
983 .data = &kstack_depth_to_print,
984 .maxlen = sizeof(int),
985 .mode = 0644,
6d456111 986 .proc_handler = proc_dointvec,
0741f4d2 987 },
6e7c4025 988 {
6e7c4025
IM		 989 .procname = "io_delay_type",
990 .data = &io_delay_type,
991 .maxlen = sizeof(int),
992 .mode = 0644,
6d456111 993 .proc_handler = proc_dointvec,
6e7c4025 994 },
1da177e4 995#endif
7a9166e3 996#if defined(CONFIG_MMU)
1da177e4 997 {
1da177e4
LT		 998 .procname = "randomize_va_space",
999 .data = &randomize_va_space,
1000 .maxlen = sizeof(int),
1001 .mode = 0644,
6d456111 1002 .proc_handler = proc_dointvec,
1da177e4 1003 },
7a9166e3 1004#endif
0152fb37 1005#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1006 {
951f22d5
MS		 1007 .procname = "spin_retry",
1008 .data = &spin_retry,
1009 .maxlen = sizeof (int),
1010 .mode = 0644,
6d456111 1011 .proc_handler = proc_dointvec,
951f22d5 1012 },
c255d844 1013#endif
673d5b43 1014#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1015 {
c255d844 1016 .procname = "acpi_video_flags",
77afcf78 1017 .data = &acpi_realmode_flags,
c255d844
PM		 1018 .maxlen = sizeof (unsigned long),
1019 .mode = 0644,
6d456111 1020 .proc_handler = proc_doulongvec_minmax,
c255d844 1021 },
d2b176ed 1022#endif
b6fca725 1023#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1024 {
d2b176ed
JS		 1025 .procname = "ignore-unaligned-usertrap",
1026 .data = &no_unaligned_warning,
1027 .maxlen = sizeof (int),
1028 .mode = 0644,
6d456111 1029 .proc_handler = proc_dointvec,
d2b176ed 1030 },
b6fca725
VG		 1031#endif
1032#ifdef CONFIG_IA64
88fc241f 1033 {
88fc241f
DC		 1034 .procname = "unaligned-dump-stack",
1035 .data = &unaligned_dump_stack,
1036 .maxlen = sizeof (int),
1037 .mode = 0644,
6d456111 1038 .proc_handler = proc_dointvec,
88fc241f 1039 },
bebfa101 1040#endif
e162b39a
MSB		 1041#ifdef CONFIG_DETECT_HUNG_TASK
1042 {
e162b39a
MSB		 1043 .procname = "hung_task_panic",
1044 .data = &sysctl_hung_task_panic,
1045 .maxlen = sizeof(int),
1046 .mode = 0644,
6d456111 1047 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 1048 .extra1 = &zero,
1049 .extra2 = &one,
1050 },
82a1fcb9 1051 {
82a1fcb9
IM		 1052 .procname = "hung_task_check_count",
1053 .data = &sysctl_hung_task_check_count,
cd64647f 1054 .maxlen = sizeof(int),
82a1fcb9 1055 .mode = 0644,
cd64647f
LZ		 1056 .proc_handler = proc_dointvec_minmax,
1057 .extra1 = &zero,
82a1fcb9
IM		 1058 },
1059 {
82a1fcb9
IM		 1060 .procname = "hung_task_timeout_secs",
1061 .data = &sysctl_hung_task_timeout_secs,
90739081 1062 .maxlen = sizeof(unsigned long),
82a1fcb9 1063 .mode = 0644,
6d456111 1064 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1065 .extra2 = &hung_task_timeout_max,
82a1fcb9
IM		 1066 },
1067 {
82a1fcb9
IM		 1068 .procname = "hung_task_warnings",
1069 .data = &sysctl_hung_task_warnings,
270750db 1070 .maxlen = sizeof(int),
82a1fcb9 1071 .mode = 0644,
270750db
AT		 1072 .proc_handler = proc_dointvec_minmax,
1073 .extra1 = &neg_one,
82a1fcb9 1074 },
c4f3b63f 1075#endif
bebfa101
AK		 1076#ifdef CONFIG_COMPAT
1077 {
bebfa101
AK		 1078 .procname = "compat-log",
1079 .data = &compat_log,
1080 .maxlen = sizeof (int),
1081 .mode = 0644,
6d456111 1082 .proc_handler = proc_dointvec,
bebfa101 1083 },
951f22d5 1084#endif
23f78d4a
IM		 1085#ifdef CONFIG_RT_MUTEXES
1086 {
23f78d4a
IM		 1087 .procname = "max_lock_depth",
1088 .data = &max_lock_depth,
1089 .maxlen = sizeof(int),
1090 .mode = 0644,
6d456111 1091 .proc_handler = proc_dointvec,
23f78d4a 1092 },
5096add8 1093#endif
10a0a8d4 1094 {
10a0a8d4
JF		 1095 .procname = "poweroff_cmd",
1096 .data = &poweroff_cmd,
1097 .maxlen = POWEROFF_CMD_PATH_LEN,
1098 .mode = 0644,
6d456111 1099 .proc_handler = proc_dostring,
10a0a8d4 1100 },
0b77f5bf
DH		 1101#ifdef CONFIG_KEYS
1102 {
0b77f5bf
DH		 1103 .procname = "keys",
1104 .mode = 0555,
1105 .child = key_sysctls,
1106 },
1107#endif
cdd6c482 1108#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1109 /*
1110 * User-space scripts rely on the existence of this file
1111 * as a feature check for perf_events being enabled.
1112 *
1113 * So it's an ABI, do not remove!
1114 */
1ccd1549 1115 {
cdd6c482
IM		 1116 .procname = "perf_event_paranoid",
1117 .data = &sysctl_perf_event_paranoid,
1118 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1119 .mode = 0644,
6d456111 1120 .proc_handler = proc_dointvec,
1ccd1549 1121 },
c5078f78 1122 {
cdd6c482
IM		 1123 .procname = "perf_event_mlock_kb",
1124 .data = &sysctl_perf_event_mlock,
1125 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1126 .mode = 0644,
6d456111 1127 .proc_handler = proc_dointvec,
c5078f78 1128 },
a78ac325 1129 {
cdd6c482
IM		 1130 .procname = "perf_event_max_sample_rate",
1131 .data = &sysctl_perf_event_sample_rate,
1132 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1133 .mode = 0644,
163ec435 1134 .proc_handler = perf_proc_update_handler,
723478c8 1135 .extra1 = &one,
a78ac325 1136 },
14c63f17
DH		 1137 {
1138 .procname = "perf_cpu_time_max_percent",
1139 .data = &sysctl_perf_cpu_time_max_percent,
1140 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1141 .mode = 0644,
1142 .proc_handler = perf_cpu_time_max_percent_handler,
1143 .extra1 = &zero,
1144 .extra2 = &one_hundred,
1145 },
1ccd1549 1146#endif
dfec072e
VN		 1147#ifdef CONFIG_KMEMCHECK
1148 {
dfec072e
VN		 1149 .procname = "kmemcheck",
1150 .data = &kmemcheck_enabled,
1151 .maxlen = sizeof(int),
1152 .mode = 0644,
6d456111 1153 .proc_handler = proc_dointvec,
dfec072e 1154 },
cb684b5b 1155#endif
9e3961a0
PB		 1156 {
1157 .procname = "panic_on_warn",
1158 .data = &panic_on_warn,
1159 .maxlen = sizeof(int),
1160 .mode = 0644,
1161 .proc_handler = proc_dointvec_minmax,
1162 .extra1 = &zero,
1163 .extra2 = &one,
1164 },
bc7a34b8
TG		 1165#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1166 {
1167 .procname = "timer_migration",
1168 .data = &sysctl_timer_migration,
1169 .maxlen = sizeof(unsigned int),
1170 .mode = 0644,
1171 .proc_handler = timer_migration_handler,
1172 },
1be7f75d
AS		 1173#endif
1174#ifdef CONFIG_BPF_SYSCALL
1175 {
1176 .procname = "unprivileged_bpf_disabled",
1177 .data = &sysctl_unprivileged_bpf_disabled,
1178 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1179 .mode = 0644,
1180 /* only handle a transition from default "0" to "1" */
1181 .proc_handler = proc_dointvec_minmax,
1182 .extra1 = &one,
1183 .extra2 = &one,
1184 },
bc7a34b8 1185#endif
6fce56ec 1186 { }
1da177e4
LT		 1187};
1188
d8217f07 1189static struct ctl_table vm_table[] = {
1da177e4 1190 {
1da177e4
LT		 1191 .procname = "overcommit_memory",
1192 .data = &sysctl_overcommit_memory,
1193 .maxlen = sizeof(sysctl_overcommit_memory),
1194 .mode = 0644,
cb16e95f
PH		 1195 .proc_handler = proc_dointvec_minmax,
1196 .extra1 = &zero,
1197 .extra2 = &two,
1da177e4 1198 },
fadd8fbd 1199 {
fadd8fbd
KH		 1200 .procname = "panic_on_oom",
1201 .data = &sysctl_panic_on_oom,
1202 .maxlen = sizeof(sysctl_panic_on_oom),
1203 .mode = 0644,
cb16e95f
PH		 1204 .proc_handler = proc_dointvec_minmax,
1205 .extra1 = &zero,
1206 .extra2 = &two,
fadd8fbd 1207 },
fe071d7e 1208 {
fe071d7e
DR		 1209 .procname = "oom_kill_allocating_task",
1210 .data = &sysctl_oom_kill_allocating_task,
1211 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1212 .mode = 0644,
6d456111 1213 .proc_handler = proc_dointvec,
fe071d7e 1214 },
fef1bdd6 1215 {
fef1bdd6
DR		 1216 .procname = "oom_dump_tasks",
1217 .data = &sysctl_oom_dump_tasks,
1218 .maxlen = sizeof(sysctl_oom_dump_tasks),
1219 .mode = 0644,
6d456111 1220 .proc_handler = proc_dointvec,
fef1bdd6 1221 },
1da177e4 1222 {
1da177e4
LT		 1223 .procname = "overcommit_ratio",
1224 .data = &sysctl_overcommit_ratio,
1225 .maxlen = sizeof(sysctl_overcommit_ratio),
1226 .mode = 0644,
49f0ce5f
JM		 1227 .proc_handler = overcommit_ratio_handler,
1228 },
1229 {
1230 .procname = "overcommit_kbytes",
1231 .data = &sysctl_overcommit_kbytes,
1232 .maxlen = sizeof(sysctl_overcommit_kbytes),
1233 .mode = 0644,
1234 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1235 },
1236 {
1da177e4
LT		 1237 .procname = "page-cluster",
1238 .data = &page_cluster,
1239 .maxlen = sizeof(int),
1240 .mode = 0644,
cb16e95f
PH		 1241 .proc_handler = proc_dointvec_minmax,
1242 .extra1 = &zero,
1da177e4
LT		 1243 },
1244 {
1da177e4
LT		 1245 .procname = "dirty_background_ratio",
1246 .data = &dirty_background_ratio,
1247 .maxlen = sizeof(dirty_background_ratio),
1248 .mode = 0644,
6d456111 1249 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1250 .extra1 = &zero,
1251 .extra2 = &one_hundred,
1252 },
2da02997 1253 {
2da02997
DR		 1254 .procname = "dirty_background_bytes",
1255 .data = &dirty_background_bytes,
1256 .maxlen = sizeof(dirty_background_bytes),
1257 .mode = 0644,
6d456111 1258 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1259 .extra1 = &one_ul,
2da02997 1260 },
1da177e4 1261 {
1da177e4
LT		 1262 .procname = "dirty_ratio",
1263 .data = &vm_dirty_ratio,
1264 .maxlen = sizeof(vm_dirty_ratio),
1265 .mode = 0644,
6d456111 1266 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1267 .extra1 = &zero,
1268 .extra2 = &one_hundred,
1269 },
2da02997 1270 {
2da02997
DR		 1271 .procname = "dirty_bytes",
1272 .data = &vm_dirty_bytes,
1273 .maxlen = sizeof(vm_dirty_bytes),
1274 .mode = 0644,
6d456111 1275 .proc_handler = dirty_bytes_handler,
9e4a5bda 1276 .extra1 = &dirty_bytes_min,
2da02997 1277 },
1da177e4 1278 {
1da177e4 1279 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1280 .data = &dirty_writeback_interval,
1281 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1282 .mode = 0644,
6d456111 1283 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1284 },
1285 {
1da177e4 1286 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1287 .data = &dirty_expire_interval,
1288 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1289 .mode = 0644,
cb16e95f
PH		 1290 .proc_handler = proc_dointvec_minmax,
1291 .extra1 = &zero,
1da177e4 1292 },
1efff914
TT		 1293 {
1294 .procname = "dirtytime_expire_seconds",
1295 .data = &dirtytime_expire_interval,
1296 .maxlen = sizeof(dirty_expire_interval),
1297 .mode = 0644,
1298 .proc_handler = dirtytime_interval_handler,
1299 .extra1 = &zero,
1300 },
1da177e4 1301 {
3965c9ae
WL		 1302 .procname = "nr_pdflush_threads",
1303 .mode = 0444 /* read-only */,
1304 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1305 },
1306 {
1da177e4
LT		 1307 .procname = "swappiness",
1308 .data = &vm_swappiness,
1309 .maxlen = sizeof(vm_swappiness),
1310 .mode = 0644,
6d456111 1311 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1312 .extra1 = &zero,
1313 .extra2 = &one_hundred,
1314 },
1315#ifdef CONFIG_HUGETLB_PAGE
06808b08 1316 {
1da177e4 1317 .procname = "nr_hugepages",
e5ff2159 1318 .data = NULL,
1da177e4
LT		 1319 .maxlen = sizeof(unsigned long),
1320 .mode = 0644,
6d456111 1321 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1322 },
1323#ifdef CONFIG_NUMA
1324 {
1325 .procname = "nr_hugepages_mempolicy",
1326 .data = NULL,
1327 .maxlen = sizeof(unsigned long),
1328 .mode = 0644,
1329 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1330 },
1331#endif
1da177e4 1332 {
1da177e4
LT		 1333 .procname = "hugetlb_shm_group",
1334 .data = &sysctl_hugetlb_shm_group,
1335 .maxlen = sizeof(gid_t),
1336 .mode = 0644,
6d456111 1337 .proc_handler = proc_dointvec,
1da177e4 1338 },
396faf03 1339 {
396faf03
MG		 1340 .procname = "hugepages_treat_as_movable",
1341 .data = &hugepages_treat_as_movable,
1342 .maxlen = sizeof(int),
1343 .mode = 0644,
86cdb465 1344 .proc_handler = proc_dointvec,
396faf03 1345 },
d1c3fb1f 1346 {
d1c3fb1f 1347 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1348 .data = NULL,
1349 .maxlen = sizeof(unsigned long),
d1c3fb1f 1350 .mode = 0644,
6d456111 1351 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1352 },
1da177e4
LT		 1353#endif
1354 {
1da177e4
LT		 1355 .procname = "lowmem_reserve_ratio",
1356 .data = &sysctl_lowmem_reserve_ratio,
1357 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1358 .mode = 0644,
6d456111 1359 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1360 },
9d0243bc 1361 {
9d0243bc
AM		 1362 .procname = "drop_caches",
1363 .data = &sysctl_drop_caches,
1364 .maxlen = sizeof(int),
1365 .mode = 0644,
1366 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1367 .extra1 = &one,
5509a5d2 1368 .extra2 = &four,
9d0243bc 1369 },
76ab0f53
MG		 1370#ifdef CONFIG_COMPACTION
1371 {
1372 .procname = "compact_memory",
1373 .data = &sysctl_compact_memory,
1374 .maxlen = sizeof(int),
1375 .mode = 0200,
1376 .proc_handler = sysctl_compaction_handler,
1377 },
5e771905
MG		 1378 {
1379 .procname = "extfrag_threshold",
1380 .data = &sysctl_extfrag_threshold,
1381 .maxlen = sizeof(int),
1382 .mode = 0644,
1383 .proc_handler = sysctl_extfrag_handler,
1384 .extra1 = &min_extfrag_threshold,
1385 .extra2 = &max_extfrag_threshold,
1386 },
5bbe3547
EM		 1387 {
1388 .procname = "compact_unevictable_allowed",
1389 .data = &sysctl_compact_unevictable_allowed,
1390 .maxlen = sizeof(int),
1391 .mode = 0644,
1392 .proc_handler = proc_dointvec,
1393 .extra1 = &zero,
1394 .extra2 = &one,
1395 },
5e771905 1396
76ab0f53 1397#endif /* CONFIG_COMPACTION */
1da177e4 1398 {
1da177e4
LT		 1399 .procname = "min_free_kbytes",
1400 .data = &min_free_kbytes,
1401 .maxlen = sizeof(min_free_kbytes),
1402 .mode = 0644,
6d456111 1403 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1404 .extra1 = &zero,
1405 },
8ad4b1fb 1406 {
8ad4b1fb
RS		 1407 .procname = "percpu_pagelist_fraction",
1408 .data = &percpu_pagelist_fraction,
1409 .maxlen = sizeof(percpu_pagelist_fraction),
1410 .mode = 0644,
6d456111 1411 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1412 .extra1 = &zero,
8ad4b1fb 1413 },
1da177e4
LT		 1414#ifdef CONFIG_MMU
1415 {
1da177e4
LT		 1416 .procname = "max_map_count",
1417 .data = &sysctl_max_map_count,
1418 .maxlen = sizeof(sysctl_max_map_count),
1419 .mode = 0644,
3e26120c 1420 .proc_handler = proc_dointvec_minmax,
70da2340 1421 .extra1 = &zero,
1da177e4 1422 },
dd8632a1
PM		 1423#else
1424 {
dd8632a1
PM		 1425 .procname = "nr_trim_pages",
1426 .data = &sysctl_nr_trim_pages,
1427 .maxlen = sizeof(sysctl_nr_trim_pages),
1428 .mode = 0644,
6d456111 1429 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1430 .extra1 = &zero,
1431 },
1da177e4
LT		 1432#endif
1433 {
1da177e4
LT		 1434 .procname = "laptop_mode",
1435 .data = &laptop_mode,
1436 .maxlen = sizeof(laptop_mode),
1437 .mode = 0644,
6d456111 1438 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1439 },
1440 {
1da177e4
LT		 1441 .procname = "block_dump",
1442 .data = &block_dump,
1443 .maxlen = sizeof(block_dump),
1444 .mode = 0644,
6d456111 1445 .proc_handler = proc_dointvec,
1da177e4
LT		 1446 .extra1 = &zero,
1447 },
1448 {
1da177e4
LT		 1449 .procname = "vfs_cache_pressure",
1450 .data = &sysctl_vfs_cache_pressure,
1451 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1452 .mode = 0644,
6d456111 1453 .proc_handler = proc_dointvec,
1da177e4
LT		 1454 .extra1 = &zero,
1455 },
1456#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1457 {
1da177e4
LT		 1458 .procname = "legacy_va_layout",
1459 .data = &sysctl_legacy_va_layout,
1460 .maxlen = sizeof(sysctl_legacy_va_layout),
1461 .mode = 0644,
6d456111 1462 .proc_handler = proc_dointvec,
1da177e4
LT		 1463 .extra1 = &zero,
1464 },
1465#endif
1743660b
CL		 1466#ifdef CONFIG_NUMA
1467 {
1743660b
CL		 1468 .procname = "zone_reclaim_mode",
1469 .data = &zone_reclaim_mode,
1470 .maxlen = sizeof(zone_reclaim_mode),
1471 .mode = 0644,
6d456111 1472 .proc_handler = proc_dointvec,
c84db23c 1473 .extra1 = &zero,
1743660b 1474 },
9614634f 1475 {
9614634f
CL		 1476 .procname = "min_unmapped_ratio",
1477 .data = &sysctl_min_unmapped_ratio,
1478 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1479 .mode = 0644,
6d456111 1480 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1481 .extra1 = &zero,
1482 .extra2 = &one_hundred,
1483 },
0ff38490 1484 {
0ff38490
CL		 1485 .procname = "min_slab_ratio",
1486 .data = &sysctl_min_slab_ratio,
1487 .maxlen = sizeof(sysctl_min_slab_ratio),
1488 .mode = 0644,
6d456111 1489 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1490 .extra1 = &zero,
1491 .extra2 = &one_hundred,
1492 },
e6e5494c 1493#endif
77461ab3
CL		 1494#ifdef CONFIG_SMP
1495 {
77461ab3
CL		 1496 .procname = "stat_interval",
1497 .data = &sysctl_stat_interval,
1498 .maxlen = sizeof(sysctl_stat_interval),
1499 .mode = 0644,
6d456111 1500 .proc_handler = proc_dointvec_jiffies,
77461ab3
CL		 1501 },
1502#endif
6e141546 1503#ifdef CONFIG_MMU
ed032189 1504 {
ed032189 1505 .procname = "mmap_min_addr",
788084ab
EP		 1506 .data = &dac_mmap_min_addr,
1507 .maxlen = sizeof(unsigned long),
ed032189 1508 .mode = 0644,
6d456111 1509 .proc_handler = mmap_min_addr_handler,
ed032189 1510 },
6e141546 1511#endif
f0c0b2b8
KH		 1512#ifdef CONFIG_NUMA
1513 {
f0c0b2b8
KH		 1514 .procname = "numa_zonelist_order",
1515 .data = &numa_zonelist_order,
1516 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1517 .mode = 0644,
6d456111 1518 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1519 },
1520#endif
2b8232ce 1521#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1522 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1523 {
e6e5494c 1524 .procname = "vdso_enabled",
3d7ee969
AL		 1525#ifdef CONFIG_X86_32
1526 .data = &vdso32_enabled,
1527 .maxlen = sizeof(vdso32_enabled),
1528#else
e6e5494c
IM		 1529 .data = &vdso_enabled,
1530 .maxlen = sizeof(vdso_enabled),
3d7ee969 1531#endif
e6e5494c 1532 .mode = 0644,
6d456111 1533 .proc_handler = proc_dointvec,
e6e5494c
IM		 1534 .extra1 = &zero,
1535 },
1da177e4 1536#endif
195cf453
BG		 1537#ifdef CONFIG_HIGHMEM
1538 {
195cf453
BG		 1539 .procname = "highmem_is_dirtyable",
1540 .data = &vm_highmem_is_dirtyable,
1541 .maxlen = sizeof(vm_highmem_is_dirtyable),
1542 .mode = 0644,
6d456111 1543 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1544 .extra1 = &zero,
1545 .extra2 = &one,
1546 },
1547#endif
6a46079c
AK		 1548#ifdef CONFIG_MEMORY_FAILURE
1549 {
6a46079c
AK		 1550 .procname = "memory_failure_early_kill",
1551 .data = &sysctl_memory_failure_early_kill,
1552 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1553 .mode = 0644,
6d456111 1554 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1555 .extra1 = &zero,
1556 .extra2 = &one,
1557 },
1558 {
6a46079c
AK		 1559 .procname = "memory_failure_recovery",
1560 .data = &sysctl_memory_failure_recovery,
1561 .maxlen = sizeof(sysctl_memory_failure_recovery),
1562 .mode = 0644,
6d456111 1563 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1564 .extra1 = &zero,
1565 .extra2 = &one,
1566 },
1567#endif
c9b1d098
AS		 1568 {
1569 .procname = "user_reserve_kbytes",
1570 .data = &sysctl_user_reserve_kbytes,
1571 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1572 .mode = 0644,
1573 .proc_handler = proc_doulongvec_minmax,
1574 },
4eeab4f5
AS		 1575 {
1576 .procname = "admin_reserve_kbytes",
1577 .data = &sysctl_admin_reserve_kbytes,
1578 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1579 .mode = 0644,
1580 .proc_handler = proc_doulongvec_minmax,
1581 },
d07e2259
DC		 1582#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1583 {
1584 .procname = "mmap_rnd_bits",
1585 .data = &mmap_rnd_bits,
1586 .maxlen = sizeof(mmap_rnd_bits),
1587 .mode = 0600,
1588 .proc_handler = proc_dointvec_minmax,
1589 .extra1 = (void *)&mmap_rnd_bits_min,
1590 .extra2 = (void *)&mmap_rnd_bits_max,
1591 },
1592#endif
1593#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1594 {
1595 .procname = "mmap_rnd_compat_bits",
1596 .data = &mmap_rnd_compat_bits,
1597 .maxlen = sizeof(mmap_rnd_compat_bits),
1598 .mode = 0600,
1599 .proc_handler = proc_dointvec_minmax,
1600 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1601 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1602 },
1603#endif
6fce56ec 1604 { }
1da177e4
LT		 1605};
1606
d8217f07 1607static struct ctl_table fs_table[] = {
1da177e4 1608 {
1da177e4
LT		 1609 .procname = "inode-nr",
1610 .data = &inodes_stat,
3942c07c 1611 .maxlen = 2*sizeof(long),
1da177e4 1612 .mode = 0444,
cffbc8aa 1613 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1614 },
1615 {
1da177e4
LT		 1616 .procname = "inode-state",
1617 .data = &inodes_stat,
3942c07c 1618 .maxlen = 7*sizeof(long),
1da177e4 1619 .mode = 0444,
cffbc8aa 1620 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1621 },
1622 {
1da177e4
LT		 1623 .procname = "file-nr",
1624 .data = &files_stat,
518de9b3 1625 .maxlen = sizeof(files_stat),
1da177e4 1626 .mode = 0444,
6d456111 1627 .proc_handler = proc_nr_files,
1da177e4
LT		 1628 },
1629 {
1da177e4
LT		 1630 .procname = "file-max",
1631 .data = &files_stat.max_files,
518de9b3 1632 .maxlen = sizeof(files_stat.max_files),
1da177e4 1633 .mode = 0644,
518de9b3 1634 .proc_handler = proc_doulongvec_minmax,
1da177e4 1635 },
9cfe015a 1636 {
9cfe015a
ED		 1637 .procname = "nr_open",
1638 .data = &sysctl_nr_open,
1639 .maxlen = sizeof(int),
1640 .mode = 0644,
6d456111 1641 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1642 .extra1 = &sysctl_nr_open_min,
1643 .extra2 = &sysctl_nr_open_max,
9cfe015a 1644 },
1da177e4 1645 {
1da177e4
LT		 1646 .procname = "dentry-state",
1647 .data = &dentry_stat,
3942c07c 1648 .maxlen = 6*sizeof(long),
1da177e4 1649 .mode = 0444,
312d3ca8 1650 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1651 },
1652 {
1da177e4
LT		 1653 .procname = "overflowuid",
1654 .data = &fs_overflowuid,
1655 .maxlen = sizeof(int),
1656 .mode = 0644,
6d456111 1657 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1658 .extra1 = &minolduid,
1659 .extra2 = &maxolduid,
1660 },
1661 {
1da177e4
LT		 1662 .procname = "overflowgid",
1663 .data = &fs_overflowgid,
1664 .maxlen = sizeof(int),
1665 .mode = 0644,
6d456111 1666 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1667 .extra1 = &minolduid,
1668 .extra2 = &maxolduid,
1669 },
bfcd17a6 1670#ifdef CONFIG_FILE_LOCKING
1da177e4 1671 {
1da177e4
LT		 1672 .procname = "leases-enable",
1673 .data = &leases_enable,
1674 .maxlen = sizeof(int),
1675 .mode = 0644,
6d456111 1676 .proc_handler = proc_dointvec,
1da177e4 1677 },
bfcd17a6 1678#endif
1da177e4
LT		 1679#ifdef CONFIG_DNOTIFY
1680 {
1da177e4
LT		 1681 .procname = "dir-notify-enable",
1682 .data = &dir_notify_enable,
1683 .maxlen = sizeof(int),
1684 .mode = 0644,
6d456111 1685 .proc_handler = proc_dointvec,
1da177e4
LT		 1686 },
1687#endif
1688#ifdef CONFIG_MMU
bfcd17a6 1689#ifdef CONFIG_FILE_LOCKING
1da177e4 1690 {
1da177e4
LT		 1691 .procname = "lease-break-time",
1692 .data = &lease_break_time,
1693 .maxlen = sizeof(int),
1694 .mode = 0644,
6d456111 1695 .proc_handler = proc_dointvec,
1da177e4 1696 },
bfcd17a6 1697#endif
ebf3f09c 1698#ifdef CONFIG_AIO
1da177e4 1699 {
1da177e4
LT		 1700 .procname = "aio-nr",
1701 .data = &aio_nr,
1702 .maxlen = sizeof(aio_nr),
1703 .mode = 0444,
6d456111 1704 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1705 },
1706 {
1da177e4
LT		 1707 .procname = "aio-max-nr",
1708 .data = &aio_max_nr,
1709 .maxlen = sizeof(aio_max_nr),
1710 .mode = 0644,
6d456111 1711 .proc_handler = proc_doulongvec_minmax,
1da177e4 1712 },
ebf3f09c 1713#endif /* CONFIG_AIO */
2d9048e2 1714#ifdef CONFIG_INOTIFY_USER
0399cb08 1715 {
0399cb08
RL		 1716 .procname = "inotify",
1717 .mode = 0555,
1718 .child = inotify_table,
1719 },
1720#endif
7ef9964e
DL		 1721#ifdef CONFIG_EPOLL
1722 {
1723 .procname = "epoll",
1724 .mode = 0555,
1725 .child = epoll_table,
1726 },
1727#endif
1da177e4 1728#endif
800179c9
KC		 1729 {
1730 .procname = "protected_symlinks",
1731 .data = &sysctl_protected_symlinks,
1732 .maxlen = sizeof(int),
1733 .mode = 0600,
1734 .proc_handler = proc_dointvec_minmax,
1735 .extra1 = &zero,
1736 .extra2 = &one,
1737 },
1738 {
1739 .procname = "protected_hardlinks",
1740 .data = &sysctl_protected_hardlinks,
1741 .maxlen = sizeof(int),
1742 .mode = 0600,
1743 .proc_handler = proc_dointvec_minmax,
1744 .extra1 = &zero,
1745 .extra2 = &one,
1746 },
d6e71144 1747 {
d6e71144
AC		 1748 .procname = "suid_dumpable",
1749 .data = &suid_dumpable,
1750 .maxlen = sizeof(int),
1751 .mode = 0644,
54b50199 1752 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1753 .extra1 = &zero,
1754 .extra2 = &two,
d6e71144 1755 },
2abc26fc
EB		 1756#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1757 {
2abc26fc
EB		 1758 .procname = "binfmt_misc",
1759 .mode = 0555,
f9bd6733 1760 .child = sysctl_mount_point,
2abc26fc
EB		 1761 },
1762#endif
b492e95b 1763 {
ff9da691
JA		 1764 .procname = "pipe-max-size",
1765 .data = &pipe_max_size,
b492e95b
JA		 1766 .maxlen = sizeof(int),
1767 .mode = 0644,
ff9da691
JA		 1768 .proc_handler = &pipe_proc_fn,
1769 .extra1 = &pipe_min_size,
b492e95b 1770 },
759c0114
WT		 1771 {
1772 .procname = "pipe-user-pages-hard",
1773 .data = &pipe_user_pages_hard,
1774 .maxlen = sizeof(pipe_user_pages_hard),
1775 .mode = 0644,
1776 .proc_handler = proc_doulongvec_minmax,
1777 },
1778 {
1779 .procname = "pipe-user-pages-soft",
1780 .data = &pipe_user_pages_soft,
1781 .maxlen = sizeof(pipe_user_pages_soft),
1782 .mode = 0644,
1783 .proc_handler = proc_doulongvec_minmax,
1784 },
6fce56ec 1785 { }
1da177e4
LT		 1786};
1787
d8217f07 1788static struct ctl_table debug_table[] = {
7ac57a89 1789#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1790 {
abd4f750
MAS		 1791 .procname = "exception-trace",
1792 .data = &show_unhandled_signals,
1793 .maxlen = sizeof(int),
1794 .mode = 0644,
1795 .proc_handler = proc_dointvec
1796 },
b2be84df
MH		 1797#endif
1798#if defined(CONFIG_OPTPROBES)
1799 {
1800 .procname = "kprobes-optimization",
1801 .data = &sysctl_kprobes_optimization,
1802 .maxlen = sizeof(int),
1803 .mode = 0644,
1804 .proc_handler = proc_kprobes_optimization_handler,
1805 .extra1 = &zero,
1806 .extra2 = &one,
1807 },
abd4f750 1808#endif
6fce56ec 1809 { }
1da177e4
LT		 1810};
1811
d8217f07 1812static struct ctl_table dev_table[] = {
6fce56ec 1813 { }
0eeca283 1814};
1da177e4 1815
de4e83bd 1816int __init sysctl_init(void)
d912b0cc 1817{
fd4b616b
SR		 1818 struct ctl_table_header *hdr;
1819
1820 hdr = register_sysctl_table(sysctl_base_table);
1821 kmemleak_not_leak(hdr);
d912b0cc
EB		 1822 return 0;
1823}
1824
b89a8171
EB		 1825#endif /* CONFIG_SYSCTL */
1826
1da177e4
LT		 1827/*
1828 * /proc/sys support
1829 */
1830
b89a8171 1831#ifdef CONFIG_PROC_SYSCTL
1da177e4 1832
f8808300
KC		 1833static int _proc_do_string(char *data, int maxlen, int write,
1834 char __user *buffer,
b1ba4ddd 1835 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1836{
1837 size_t len;
1838 char __user *p;
1839 char c;
8d060877
ON		 1840
1841 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1842 *lenp = 0;
1843 return 0;
1844 }
8d060877 1845
1da177e4 1846 if (write) {
f4aacea2
KC		 1847 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1848 /* Only continue writes not past the end of buffer. */
1849 len = strlen(data);
1850 if (len > maxlen - 1)
1851 len = maxlen - 1;
1852
1853 if (*ppos > len)
1854 return 0;
1855 len = *ppos;
1856 } else {
1857 /* Start writing from beginning of buffer. */
1858 len = 0;
1859 }
1860
2ca9bb45 1861 *ppos += *lenp;
1da177e4 1862 p = buffer;
2ca9bb45 1863 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1864 if (get_user(c, p++))
1865 return -EFAULT;
1866 if (c == 0 || c == '\n')
1867 break;
2ca9bb45 1868 data[len++] = c;
1da177e4 1869 }
f8808300 1870 data[len] = 0;
1da177e4 1871 } else {
f5dd3d6f
SV		 1872 len = strlen(data);
1873 if (len > maxlen)
1874 len = maxlen;
8d060877
ON		 1875
1876 if (*ppos > len) {
1877 *lenp = 0;
1878 return 0;
1879 }
1880
1881 data += *ppos;
1882 len -= *ppos;
1883
1da177e4
LT		 1884 if (len > *lenp)
1885 len = *lenp;
1886 if (len)
f8808300 1887 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1888 return -EFAULT;
1889 if (len < *lenp) {
f8808300 1890 if (put_user('\n', buffer + len))
1da177e4
LT		 1891 return -EFAULT;
1892 len++;
1893 }
1894 *lenp = len;
1895 *ppos += len;
1896 }
1897 return 0;
1898}
1899
f4aacea2
KC		 1900static void warn_sysctl_write(struct ctl_table *table)
1901{
1902 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1903 "This will not be supported in the future. To silence this\n"
1904 "warning, set kernel.sysctl_writes_strict = -1\n",
1905 current->comm, table->procname);
1906}
1907
f5dd3d6f
SV		 1908/**
1909 * proc_dostring - read a string sysctl
1910 * @table: the sysctl table
1911 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 1912 * @buffer: the user buffer
1913 * @lenp: the size of the user buffer
1914 * @ppos: file position
1915 *
1916 * Reads/writes a string from/to the user buffer. If the kernel
1917 * buffer provided is not large enough to hold the string, the
1918 * string is truncated. The copied string is %NULL-terminated.
1919 * If the string is being read by the user process, it is copied
1920 * and a newline '\n' is added. It is truncated if the buffer is
1921 * not large enough.
1922 *
1923 * Returns 0 on success.
1924 */
8d65af78 1925int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 1926 void __user *buffer, size_t *lenp, loff_t *ppos)
1927{
f4aacea2
KC		 1928 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1929 warn_sysctl_write(table);
1930
f8808300
KC		 1931 return _proc_do_string((char *)(table->data), table->maxlen, write,
1932 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 1933}
1934
00b7c339
AW		 1935static size_t proc_skip_spaces(char **buf)
1936{
1937 size_t ret;
1938 char *tmp = skip_spaces(*buf);
1939 ret = tmp - *buf;
1940 *buf = tmp;
1941 return ret;
1942}
1943
9f977fb7
OP		 1944static void proc_skip_char(char **buf, size_t *size, const char v)
1945{
1946 while (*size) {
1947 if (**buf != v)
1948 break;
1949 (*size)--;
1950 (*buf)++;
1951 }
1952}
1953
00b7c339
AW		 1954#define TMPBUFLEN 22
1955/**
0fc377bd 1956 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 1957 *
0fc377bd
RD		 1958 * @buf: a kernel buffer
1959 * @size: size of the kernel buffer
1960 * @val: this is where the number will be stored
1961 * @neg: set to %TRUE if number is negative
1962 * @perm_tr: a vector which contains the allowed trailers
1963 * @perm_tr_len: size of the perm_tr vector
1964 * @tr: pointer to store the trailer character
00b7c339 1965 *
0fc377bd
RD		 1966 * In case of success %0 is returned and @buf and @size are updated with
1967 * the amount of bytes read. If @tr is non-NULL and a trailing
1968 * character exists (size is non-zero after returning from this
1969 * function), @tr is updated with the trailing character.
00b7c339
AW		 1970 */
1971static int proc_get_long(char **buf, size_t *size,
1972 unsigned long *val, bool *neg,
1973 const char *perm_tr, unsigned perm_tr_len, char *tr)
1974{
1975 int len;
1976 char *p, tmp[TMPBUFLEN];
1977
1978 if (!*size)
1979 return -EINVAL;
1980
1981 len = *size;
1982 if (len > TMPBUFLEN - 1)
1983 len = TMPBUFLEN - 1;
1984
1985 memcpy(tmp, *buf, len);
1986
1987 tmp[len] = 0;
1988 p = tmp;
1989 if (*p == '-' && *size > 1) {
1990 *neg = true;
1991 p++;
1992 } else
1993 *neg = false;
1994 if (!isdigit(*p))
1995 return -EINVAL;
1996
1997 *val = simple_strtoul(p, &p, 0);
1998
1999 len = p - tmp;
2000
2001 /* We don't know if the next char is whitespace thus we may accept
2002 * invalid integers (e.g. 1234...a) or two integers instead of one
2003 * (e.g. 123...1). So lets not allow such large numbers. */
2004 if (len == TMPBUFLEN - 1)
2005 return -EINVAL;
2006
2007 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2008 return -EINVAL;
1da177e4 2009
00b7c339
AW		 2010 if (tr && (len < *size))
2011 *tr = *p;
2012
2013 *buf += len;
2014 *size -= len;
2015
2016 return 0;
2017}
2018
2019/**
0fc377bd 2020 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2021 *
0fc377bd
RD		 2022 * @buf: the user buffer
2023 * @size: the size of the user buffer
2024 * @val: the integer to be converted
2025 * @neg: sign of the number, %TRUE for negative
00b7c339 2026 *
0fc377bd
RD		 2027 * In case of success %0 is returned and @buf and @size are updated with
2028 * the amount of bytes written.
00b7c339
AW		 2029 */
2030static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2031 bool neg)
2032{
2033 int len;
2034 char tmp[TMPBUFLEN], *p = tmp;
2035
2036 sprintf(p, "%s%lu", neg ? "-" : "", val);
2037 len = strlen(tmp);
2038 if (len > *size)
2039 len = *size;
2040 if (copy_to_user(*buf, tmp, len))
2041 return -EFAULT;
2042 *size -= len;
2043 *buf += len;
2044 return 0;
2045}
2046#undef TMPBUFLEN
2047
2048static int proc_put_char(void __user **buf, size_t *size, char c)
2049{
2050 if (*size) {
2051 char __user **buffer = (char __user **)buf;
2052 if (put_user(c, *buffer))
2053 return -EFAULT;
2054 (*size)--, (*buffer)++;
2055 *buf = *buffer;
2056 }
2057 return 0;
2058}
1da177e4 2059
00b7c339 2060static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2061 int *valp,
2062 int write, void *data)
2063{
2064 if (write) {
230633d1
HS		 2065 if (*negp) {
2066 if (*lvalp > (unsigned long) INT_MAX + 1)
2067 return -EINVAL;
2068 *valp = -*lvalp;
2069 } else {
2070 if (*lvalp > (unsigned long) INT_MAX)
2071 return -EINVAL;
2072 *valp = *lvalp;
2073 }
1da177e4
LT		 2074 } else {
2075 int val = *valp;
2076 if (val < 0) {
00b7c339 2077 *negp = true;
9a5bc726 2078 *lvalp = -(unsigned long)val;
1da177e4 2079 } else {
00b7c339 2080 *negp = false;
1da177e4
LT		 2081 *lvalp = (unsigned long)val;
2082 }
2083 }
2084 return 0;
2085}
2086
00b7c339
AW		 2087static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2088
d8217f07 2089static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2090 int write, void __user *buffer,
fcfbd547 2091 size_t *lenp, loff_t *ppos,
00b7c339 2092 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2093 int write, void *data),
2094 void *data)
2095{
00b7c339 2096 int *i, vleft, first = 1, err = 0;
00b7c339 2097 size_t left;
70f6cbb6 2098 char *kbuf = NULL, *p;
1da177e4 2099
00b7c339 2100 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2101 *lenp = 0;
2102 return 0;
2103 }
2104
fcfbd547 2105 i = (int *) tbl_data;
1da177e4
LT		 2106 vleft = table->maxlen / sizeof(*i);
2107 left = *lenp;
2108
2109 if (!conv)
2110 conv = do_proc_dointvec_conv;
2111
00b7c339 2112 if (write) {
f4aacea2
KC		 2113 if (*ppos) {
2114 switch (sysctl_writes_strict) {
2115 case SYSCTL_WRITES_STRICT:
2116 goto out;
2117 case SYSCTL_WRITES_WARN:
2118 warn_sysctl_write(table);
2119 break;
2120 default:
2121 break;
2122 }
2123 }
2124
00b7c339
AW		 2125 if (left > PAGE_SIZE - 1)
2126 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2127 p = kbuf = memdup_user_nul(buffer, left);
2128 if (IS_ERR(kbuf))
2129 return PTR_ERR(kbuf);
00b7c339
AW		 2130 }
2131
1da177e4 2132 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2133 unsigned long lval;
2134 bool neg;
1da177e4 2135
00b7c339 2136 if (write) {
70f6cbb6 2137 left -= proc_skip_spaces(&p);
1da177e4 2138
563b0467
O		 2139 if (!left)
2140 break;
70f6cbb6 2141 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2142 proc_wspace_sep,
2143 sizeof(proc_wspace_sep), NULL);
2144 if (err)
1da177e4 2145 break;
00b7c339
AW		 2146 if (conv(&neg, &lval, i, 1, data)) {
2147 err = -EINVAL;
1da177e4 2148 break;
00b7c339 2149 }
1da177e4 2150 } else {
00b7c339
AW		 2151 if (conv(&neg, &lval, i, 0, data)) {
2152 err = -EINVAL;
2153 break;
2154 }
1da177e4 2155 if (!first)
00b7c339
AW		 2156 err = proc_put_char(&buffer, &left, '\t');
2157 if (err)
2158 break;
2159 err = proc_put_long(&buffer, &left, lval, neg);
2160 if (err)
1da177e4 2161 break;
1da177e4
LT		 2162 }
2163 }
2164
00b7c339
AW		 2165 if (!write && !first && left && !err)
2166 err = proc_put_char(&buffer, &left, '\n');
563b0467 2167 if (write && !err && left)
70f6cbb6 2168 left -= proc_skip_spaces(&p);
1da177e4 2169 if (write) {
70f6cbb6 2170 kfree(kbuf);
00b7c339
AW		 2171 if (first)
2172 return err ? : -EINVAL;
1da177e4 2173 }
1da177e4 2174 *lenp -= left;
f4aacea2 2175out:
1da177e4 2176 *ppos += *lenp;
00b7c339 2177 return err;
1da177e4
LT		 2178}
2179
8d65af78 2180static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2181 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2182 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2183 int write, void *data),
2184 void *data)
2185{
8d65af78 2186 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2187 buffer, lenp, ppos, conv, data);
2188}
2189
1da177e4
LT		 2190/**
2191 * proc_dointvec - read a vector of integers
2192 * @table: the sysctl table
2193 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2194 * @buffer: the user buffer
2195 * @lenp: the size of the user buffer
2196 * @ppos: file position
2197 *
2198 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2199 * values from/to the user buffer, treated as an ASCII string.
2200 *
2201 * Returns 0 on success.
2202 */
8d65af78 2203int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2204 void __user *buffer, size_t *lenp, loff_t *ppos)
2205{
8d65af78 2206 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2207 NULL,NULL);
2208}
2209
34f5a398 2210/*
25ddbb18
AK		 2211 * Taint values can only be increased
2212 * This means we can safely use a temporary.
34f5a398 2213 */
8d65af78 2214static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2215 void __user *buffer, size_t *lenp, loff_t *ppos)
2216{
25ddbb18
AK		 2217 struct ctl_table t;
2218 unsigned long tmptaint = get_taint();
2219 int err;
34f5a398 2220
91fcd412 2221 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2222 return -EPERM;
2223
25ddbb18
AK		 2224 t = *table;
2225 t.data = &tmptaint;
8d65af78 2226 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2227 if (err < 0)
2228 return err;
2229
2230 if (write) {
2231 /*
2232 * Poor man's atomic or. Not worth adding a primitive
2233 * to everyone's atomic.h for this
2234 */
2235 int i;
2236 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2237 if ((tmptaint >> i) & 1)
373d4d09 2238 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2239 }
2240 }
2241
2242 return err;
34f5a398
TT		 2243}
2244
bfdc0b49 2245#ifdef CONFIG_PRINTK
620f6e8e 2246static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2247 void __user *buffer, size_t *lenp, loff_t *ppos)
2248{
2249 if (write && !capable(CAP_SYS_ADMIN))
2250 return -EPERM;
2251
2252 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2253}
2254#endif
2255
1da177e4
LT		 2256struct do_proc_dointvec_minmax_conv_param {
2257 int *min;
2258 int *max;
2259};
2260
00b7c339
AW		 2261static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2262 int *valp,
1da177e4
LT		 2263 int write, void *data)
2264{
2265 struct do_proc_dointvec_minmax_conv_param *param = data;
2266 if (write) {
2267 int val = *negp ? -*lvalp : *lvalp;
2268 if ((param->min && *param->min > val) ||
2269 (param->max && *param->max < val))
2270 return -EINVAL;
2271 *valp = val;
2272 } else {
2273 int val = *valp;
2274 if (val < 0) {
00b7c339 2275 *negp = true;
9a5bc726 2276 *lvalp = -(unsigned long)val;
1da177e4 2277 } else {
00b7c339 2278 *negp = false;
1da177e4
LT		 2279 *lvalp = (unsigned long)val;
2280 }
2281 }
2282 return 0;
2283}
2284
2285/**
2286 * proc_dointvec_minmax - read a vector of integers with min/max values
2287 * @table: the sysctl table
2288 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2289 * @buffer: the user buffer
2290 * @lenp: the size of the user buffer
2291 * @ppos: file position
2292 *
2293 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2294 * values from/to the user buffer, treated as an ASCII string.
2295 *
2296 * This routine will ensure the values are within the range specified by
2297 * table->extra1 (min) and table->extra2 (max).
2298 *
2299 * Returns 0 on success.
2300 */
8d65af78 2301int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2302 void __user *buffer, size_t *lenp, loff_t *ppos)
2303{
2304 struct do_proc_dointvec_minmax_conv_param param = {
2305 .min = (int *) table->extra1,
2306 .max = (int *) table->extra2,
2307 };
8d65af78 2308 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2309 do_proc_dointvec_minmax_conv, &param);
2310}
2311
54b50199
KC		 2312static void validate_coredump_safety(void)
2313{
046d662f 2314#ifdef CONFIG_COREDUMP
e579d2c2 2315 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199
KC		 2316 core_pattern[0] != '/' && core_pattern[0] != '|') {
2317 printk(KERN_WARNING "Unsafe core_pattern used with "\
2318 "suid_dumpable=2. Pipe handler or fully qualified "\
2319 "core dump path required.\n");
2320 }
046d662f 2321#endif
54b50199
KC		 2322}
2323
2324static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2325 void __user *buffer, size_t *lenp, loff_t *ppos)
2326{
2327 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2328 if (!error)
2329 validate_coredump_safety();
2330 return error;
2331}
2332
046d662f 2333#ifdef CONFIG_COREDUMP
54b50199
KC		 2334static int proc_dostring_coredump(struct ctl_table *table, int write,
2335 void __user *buffer, size_t *lenp, loff_t *ppos)
2336{
2337 int error = proc_dostring(table, write, buffer, lenp, ppos);
2338 if (!error)
2339 validate_coredump_safety();
2340 return error;
2341}
046d662f 2342#endif
54b50199 2343
d8217f07 2344static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2345 void __user *buffer,
2346 size_t *lenp, loff_t *ppos,
2347 unsigned long convmul,
2348 unsigned long convdiv)
2349{
00b7c339
AW		 2350 unsigned long *i, *min, *max;
2351 int vleft, first = 1, err = 0;
00b7c339 2352 size_t left;
70f6cbb6 2353 char *kbuf = NULL, *p;
00b7c339
AW		 2354
2355 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2356 *lenp = 0;
2357 return 0;
2358 }
00b7c339 2359
fcfbd547 2360 i = (unsigned long *) data;
1da177e4
LT		 2361 min = (unsigned long *) table->extra1;
2362 max = (unsigned long *) table->extra2;
2363 vleft = table->maxlen / sizeof(unsigned long);
2364 left = *lenp;
00b7c339
AW		 2365
2366 if (write) {
f4aacea2
KC		 2367 if (*ppos) {
2368 switch (sysctl_writes_strict) {
2369 case SYSCTL_WRITES_STRICT:
2370 goto out;
2371 case SYSCTL_WRITES_WARN:
2372 warn_sysctl_write(table);
2373 break;
2374 default:
2375 break;
2376 }
2377 }
2378
00b7c339
AW		 2379 if (left > PAGE_SIZE - 1)
2380 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2381 p = kbuf = memdup_user_nul(buffer, left);
2382 if (IS_ERR(kbuf))
2383 return PTR_ERR(kbuf);
00b7c339
AW		 2384 }
2385
27b3d80a 2386 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2387 unsigned long val;
2388
1da177e4 2389 if (write) {
00b7c339
AW		 2390 bool neg;
2391
70f6cbb6 2392 left -= proc_skip_spaces(&p);
00b7c339 2393
70f6cbb6 2394 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2395 proc_wspace_sep,
2396 sizeof(proc_wspace_sep), NULL);
2397 if (err)
1da177e4
LT		 2398 break;
2399 if (neg)
1da177e4
LT		 2400 continue;
2401 if ((min && val < *min) || (max && val > *max))
2402 continue;
2403 *i = val;
2404 } else {
00b7c339 2405 val = convdiv * (*i) / convmul;
7833819d 2406 if (!first) {
00b7c339 2407 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2408 if (err)
2409 break;
2410 }
00b7c339
AW		 2411 err = proc_put_long(&buffer, &left, val, false);
2412 if (err)
2413 break;
1da177e4
LT		 2414 }
2415 }
2416
00b7c339
AW		 2417 if (!write && !first && left && !err)
2418 err = proc_put_char(&buffer, &left, '\n');
2419 if (write && !err)
70f6cbb6 2420 left -= proc_skip_spaces(&p);
1da177e4 2421 if (write) {
70f6cbb6 2422 kfree(kbuf);
00b7c339
AW		 2423 if (first)
2424 return err ? : -EINVAL;
1da177e4 2425 }
1da177e4 2426 *lenp -= left;
f4aacea2 2427out:
1da177e4 2428 *ppos += *lenp;
00b7c339 2429 return err;
1da177e4
LT		 2430}
2431
d8217f07 2432static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2433 void __user *buffer,
2434 size_t *lenp, loff_t *ppos,
2435 unsigned long convmul,
2436 unsigned long convdiv)
2437{
2438 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2439 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2440}
2441
1da177e4
LT		 2442/**
2443 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2444 * @table: the sysctl table
2445 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2446 * @buffer: the user buffer
2447 * @lenp: the size of the user buffer
2448 * @ppos: file position
2449 *
2450 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2451 * values from/to the user buffer, treated as an ASCII string.
2452 *
2453 * This routine will ensure the values are within the range specified by
2454 * table->extra1 (min) and table->extra2 (max).
2455 *
2456 * Returns 0 on success.
2457 */
8d65af78 2458int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2459 void __user *buffer, size_t *lenp, loff_t *ppos)
2460{
8d65af78 2461 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2462}
2463
2464/**
2465 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2466 * @table: the sysctl table
2467 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2468 * @buffer: the user buffer
2469 * @lenp: the size of the user buffer
2470 * @ppos: file position
2471 *
2472 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2473 * values from/to the user buffer, treated as an ASCII string. The values
2474 * are treated as milliseconds, and converted to jiffies when they are stored.
2475 *
2476 * This routine will ensure the values are within the range specified by
2477 * table->extra1 (min) and table->extra2 (max).
2478 *
2479 * Returns 0 on success.
2480 */
d8217f07 2481int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2482 void __user *buffer,
2483 size_t *lenp, loff_t *ppos)
2484{
8d65af78 2485 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2486 lenp, ppos, HZ, 1000l);
2487}
2488
2489
00b7c339 2490static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2491 int *valp,
2492 int write, void *data)
2493{
2494 if (write) {
cba9f33d
BS		 2495 if (*lvalp > LONG_MAX / HZ)
2496 return 1;
1da177e4
LT		 2497 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2498 } else {
2499 int val = *valp;
2500 unsigned long lval;
2501 if (val < 0) {
00b7c339 2502 *negp = true;
9a5bc726 2503 lval = -(unsigned long)val;
1da177e4 2504 } else {
00b7c339 2505 *negp = false;
1da177e4
LT		 2506 lval = (unsigned long)val;
2507 }
2508 *lvalp = lval / HZ;
2509 }
2510 return 0;
2511}
2512
00b7c339 2513static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2514 int *valp,
2515 int write, void *data)
2516{
2517 if (write) {
cba9f33d
BS		 2518 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2519 return 1;
1da177e4
LT		 2520 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2521 } else {
2522 int val = *valp;
2523 unsigned long lval;
2524 if (val < 0) {
00b7c339 2525 *negp = true;
9a5bc726 2526 lval = -(unsigned long)val;
1da177e4 2527 } else {
00b7c339 2528 *negp = false;
1da177e4
LT		 2529 lval = (unsigned long)val;
2530 }
2531 *lvalp = jiffies_to_clock_t(lval);
2532 }
2533 return 0;
2534}
2535
00b7c339 2536static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2537 int *valp,
2538 int write, void *data)
2539{
2540 if (write) {
d738ce8f
FF		 2541 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2542
2543 if (jif > INT_MAX)
2544 return 1;
2545 *valp = (int)jif;
1da177e4
LT		 2546 } else {
2547 int val = *valp;
2548 unsigned long lval;
2549 if (val < 0) {
00b7c339 2550 *negp = true;
9a5bc726 2551 lval = -(unsigned long)val;
1da177e4 2552 } else {
00b7c339 2553 *negp = false;
1da177e4
LT		 2554 lval = (unsigned long)val;
2555 }
2556 *lvalp = jiffies_to_msecs(lval);
2557 }
2558 return 0;
2559}
2560
2561/**
2562 * proc_dointvec_jiffies - read a vector of integers as seconds
2563 * @table: the sysctl table
2564 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2565 * @buffer: the user buffer
2566 * @lenp: the size of the user buffer
2567 * @ppos: file position
2568 *
2569 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2570 * values from/to the user buffer, treated as an ASCII string.
2571 * The values read are assumed to be in seconds, and are converted into
2572 * jiffies.
2573 *
2574 * Returns 0 on success.
2575 */
8d65af78 2576int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2577 void __user *buffer, size_t *lenp, loff_t *ppos)
2578{
8d65af78 2579 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2580 do_proc_dointvec_jiffies_conv,NULL);
2581}
2582
2583/**
2584 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2585 * @table: the sysctl table
2586 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2587 * @buffer: the user buffer
2588 * @lenp: the size of the user buffer
1e5d5331 2589 * @ppos: pointer to the file position
1da177e4
LT		 2590 *
2591 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2592 * values from/to the user buffer, treated as an ASCII string.
2593 * The values read are assumed to be in 1/USER_HZ seconds, and
2594 * are converted into jiffies.
2595 *
2596 * Returns 0 on success.
2597 */
8d65af78 2598int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2599 void __user *buffer, size_t *lenp, loff_t *ppos)
2600{
8d65af78 2601 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2602 do_proc_dointvec_userhz_jiffies_conv,NULL);
2603}
2604
2605/**
2606 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2607 * @table: the sysctl table
2608 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2609 * @buffer: the user buffer
2610 * @lenp: the size of the user buffer
67be2dd1
MW		 2611 * @ppos: file position
2612 * @ppos: the current position in the file
1da177e4
LT		 2613 *
2614 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2615 * values from/to the user buffer, treated as an ASCII string.
2616 * The values read are assumed to be in 1/1000 seconds, and
2617 * are converted into jiffies.
2618 *
2619 * Returns 0 on success.
2620 */
8d65af78 2621int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2622 void __user *buffer, size_t *lenp, loff_t *ppos)
2623{
8d65af78 2624 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2625 do_proc_dointvec_ms_jiffies_conv, NULL);
2626}
2627
8d65af78 2628static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2629 void __user *buffer, size_t *lenp, loff_t *ppos)
2630{
2631 struct pid *new_pid;
2632 pid_t tmp;
2633 int r;
2634
6c5f3e7b 2635 tmp = pid_vnr(cad_pid);
9ec52099 2636
8d65af78 2637 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2638 lenp, ppos, NULL, NULL);
2639 if (r || !write)
2640 return r;
2641
2642 new_pid = find_get_pid(tmp);
2643 if (!new_pid)
2644 return -ESRCH;
2645
2646 put_pid(xchg(&cad_pid, new_pid));
2647 return 0;
2648}
2649
9f977fb7
OP		 2650/**
2651 * proc_do_large_bitmap - read/write from/to a large bitmap
2652 * @table: the sysctl table
2653 * @write: %TRUE if this is a write to the sysctl file
2654 * @buffer: the user buffer
2655 * @lenp: the size of the user buffer
2656 * @ppos: file position
2657 *
2658 * The bitmap is stored at table->data and the bitmap length (in bits)
2659 * in table->maxlen.
2660 *
2661 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2662 * large bitmaps may be represented in a compact manner. Writing into
2663 * the file will clear the bitmap then update it with the given input.
2664 *
2665 * Returns 0 on success.
2666 */
2667int proc_do_large_bitmap(struct ctl_table *table, int write,
2668 void __user *buffer, size_t *lenp, loff_t *ppos)
2669{
2670 int err = 0;
2671 bool first = 1;
2672 size_t left = *lenp;
2673 unsigned long bitmap_len = table->maxlen;
122ff243 2674 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2675 unsigned long *tmp_bitmap = NULL;
2676 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2677
122ff243 2678 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2679 *lenp = 0;
2680 return 0;
2681 }
2682
2683 if (write) {
70f6cbb6 2684 char *kbuf, *p;
9f977fb7
OP		 2685
2686 if (left > PAGE_SIZE - 1)
2687 left = PAGE_SIZE - 1;
2688
70f6cbb6
AV		 2689 p = kbuf = memdup_user_nul(buffer, left);
2690 if (IS_ERR(kbuf))
2691 return PTR_ERR(kbuf);
9f977fb7
OP		 2692
2693 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2694 GFP_KERNEL);
2695 if (!tmp_bitmap) {
70f6cbb6 2696 kfree(kbuf);
9f977fb7
OP		 2697 return -ENOMEM;
2698 }
70f6cbb6 2699 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 2700 while (!err && left) {
2701 unsigned long val_a, val_b;
2702 bool neg;
2703
70f6cbb6 2704 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 2705 sizeof(tr_a), &c);
2706 if (err)
2707 break;
2708 if (val_a >= bitmap_len || neg) {
2709 err = -EINVAL;
2710 break;
2711 }
2712
2713 val_b = val_a;
2714 if (left) {
70f6cbb6 2715 p++;
9f977fb7
OP		 2716 left--;
2717 }
2718
2719 if (c == '-') {
70f6cbb6 2720 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 2721 &neg, tr_b, sizeof(tr_b),
2722 &c);
2723 if (err)
2724 break;
2725 if (val_b >= bitmap_len || neg ||
2726 val_a > val_b) {
2727 err = -EINVAL;
2728 break;
2729 }
2730 if (left) {
70f6cbb6 2731 p++;
9f977fb7
OP		 2732 left--;
2733 }
2734 }
2735
5a04cca6 2736 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 2737 first = 0;
70f6cbb6 2738 proc_skip_char(&p, &left, '\n');
9f977fb7 2739 }
70f6cbb6 2740 kfree(kbuf);
9f977fb7
OP		 2741 } else {
2742 unsigned long bit_a, bit_b = 0;
2743
2744 while (left) {
2745 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2746 if (bit_a >= bitmap_len)
2747 break;
2748 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2749 bit_a + 1) - 1;
2750
2751 if (!first) {
2752 err = proc_put_char(&buffer, &left, ',');
2753 if (err)
2754 break;
2755 }
2756 err = proc_put_long(&buffer, &left, bit_a, false);
2757 if (err)
2758 break;
2759 if (bit_a != bit_b) {
2760 err = proc_put_char(&buffer, &left, '-');
2761 if (err)
2762 break;
2763 err = proc_put_long(&buffer, &left, bit_b, false);
2764 if (err)
2765 break;
2766 }
2767
2768 first = 0; bit_b++;
2769 }
2770 if (!err)
2771 err = proc_put_char(&buffer, &left, '\n');
2772 }
2773
2774 if (!err) {
2775 if (write) {
2776 if (*ppos)
2777 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2778 else
5a04cca6 2779 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 2780 }
2781 kfree(tmp_bitmap);
2782 *lenp -= left;
2783 *ppos += *lenp;
2784 return 0;
2785 } else {
2786 kfree(tmp_bitmap);
2787 return err;
2788 }
2789}
2790
55610500 2791#else /* CONFIG_PROC_SYSCTL */
1da177e4 2792
8d65af78 2793int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2794 void __user *buffer, size_t *lenp, loff_t *ppos)
2795{
2796 return -ENOSYS;
2797}
2798
8d65af78 2799int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2800 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2801{
2802 return -ENOSYS;
2803}
2804
8d65af78 2805int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2806 void __user *buffer, size_t *lenp, loff_t *ppos)
2807{
2808 return -ENOSYS;
2809}
2810
8d65af78 2811int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2812 void __user *buffer, size_t *lenp, loff_t *ppos)
2813{
2814 return -ENOSYS;
2815}
2816
8d65af78 2817int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2818 void __user *buffer, size_t *lenp, loff_t *ppos)
2819{
2820 return -ENOSYS;
2821}
2822
8d65af78 2823int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2824 void __user *buffer, size_t *lenp, loff_t *ppos)
2825{
2826 return -ENOSYS;
2827}
2828
8d65af78 2829int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2830 void __user *buffer, size_t *lenp, loff_t *ppos)
2831{
2832 return -ENOSYS;
2833}
2834
d8217f07 2835int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2836 void __user *buffer,
2837 size_t *lenp, loff_t *ppos)
2838{
2839 return -ENOSYS;
2840}
2841
2842
55610500 2843#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2844
1da177e4
LT		 2845/*
2846 * No sense putting this after each symbol definition, twice,
2847 * exception granted :-)
2848 */
2849EXPORT_SYMBOL(proc_dointvec);
2850EXPORT_SYMBOL(proc_dointvec_jiffies);
2851EXPORT_SYMBOL(proc_dointvec_minmax);
2852EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2853EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2854EXPORT_SYMBOL(proc_dostring);
2855EXPORT_SYMBOL(proc_doulongvec_minmax);
2856EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux 6.x block layer and io_uring tree(s)