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mt76: fix return value check in mt76_wmac_probe()
[mirror_ubuntu-focal-kernel.git] / kernel / sysctl.c
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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>
fd4b616b 33#include <linux/kmemleak.h>
62239ac2 34#include <linux/fs.h>
1da177e4
LT		 35#include <linux/init.h>
36#include <linux/kernel.h>
0296b228 37#include <linux/kobject.h>
20380731 38#include <linux/net.h>
1da177e4
LT		 39#include <linux/sysrq.h>
40#include <linux/highuid.h>
41#include <linux/writeback.h>
3fff4c42 42#include <linux/ratelimit.h>
76ab0f53 43#include <linux/compaction.h>
1da177e4 44#include <linux/hugetlb.h>
1da177e4 45#include <linux/initrd.h>
0b77f5bf 46#include <linux/key.h>
1da177e4
LT		 47#include <linux/times.h>
48#include <linux/limits.h>
49#include <linux/dcache.h>
6e006701 50#include <linux/dnotify.h>
1da177e4 51#include <linux/syscalls.h>
c748e134 52#include <linux/vmstat.h>
c255d844
PM		 53#include <linux/nfs_fs.h>
54#include <linux/acpi.h>
10a0a8d4 55#include <linux/reboot.h>
b0fc494f 56#include <linux/ftrace.h>
cdd6c482 57#include <linux/perf_event.h>
b2be84df 58#include <linux/kprobes.h>
b492e95b 59#include <linux/pipe_fs_i.h>
8e4228e1 60#include <linux/oom.h>
17f60a7d 61#include <linux/kmod.h>
73efc039 62#include <linux/capability.h>
40401530 63#include <linux/binfmts.h>
cf4aebc2 64#include <linux/sched/sysctl.h>
f7ccbae4 65#include <linux/sched/coredump.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
964c9dff
AP		 93#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
94#include <linux/stackleak.h>
95#endif
58687acb 96#ifdef CONFIG_LOCKUP_DETECTOR
504d7cf1
DZ		 97#include <linux/nmi.h>
98#endif
99
1da177e4
LT		 100#if defined(CONFIG_SYSCTL)
101
102/* External variables not in a header file. */
d6e71144 103extern int suid_dumpable;
046d662f
AK		 104#ifdef CONFIG_COREDUMP
105extern int core_uses_pid;
1da177e4 106extern char core_pattern[];
a293980c 107extern unsigned int core_pipe_limit;
046d662f 108#endif
1da177e4 109extern int pid_max;
1da177e4 110extern int pid_max_min, pid_max_max;
8ad4b1fb 111extern int percpu_pagelist_fraction;
9745512c 112extern int latencytop_enabled;
9b80a184 113extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 114#ifndef CONFIG_MMU
115extern int sysctl_nr_trim_pages;
116#endif
1da177e4 117
c4f3b63f 118/* Constants used for minimum and maximum */
2508ce18 119#ifdef CONFIG_LOCKUP_DETECTOR
c4f3b63f
RT		 120static int sixty = 60;
121#endif
122
270750db
AT		 123static int __maybe_unused neg_one = -1;
124
c4f3b63f 125static int zero;
cd5f9a4c
LT		 126static int __maybe_unused one = 1;
127static int __maybe_unused two = 2;
5509a5d2 128static int __maybe_unused four = 4;
fc3501d4 129static unsigned long one_ul = 1;
c4f3b63f 130static int one_hundred = 100;
795ae7a0 131static int one_thousand = 1000;
af91322e
DY		 132#ifdef CONFIG_PRINTK
133static int ten_thousand = 10000;
134#endif
c5dfd78e
ACM		 135#ifdef CONFIG_PERF_EVENTS
136static int six_hundred_forty_kb = 640 * 1024;
137#endif
c4f3b63f 138
9e4a5bda
AR		 139/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
140static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
141
1da177e4
LT		 142/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
143static int maxolduid = 65535;
144static int minolduid;
145
146static int ngroups_max = NGROUPS_MAX;
73efc039 147static const int cap_last_cap = CAP_LAST_CAP;
1da177e4 148
a2e51445
DV		 149/*
150 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
151 * and hung_task_check_interval_secs
152 */
80df2847
LH		 153#ifdef CONFIG_DETECT_HUNG_TASK
154static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
155#endif
156
d14f1729
DY		 157#ifdef CONFIG_INOTIFY_USER
158#include <linux/inotify.h>
159#endif
72c57ed5 160#ifdef CONFIG_SPARC
1da177e4
LT		 161#endif
162
163#ifdef __hppa__
164extern int pwrsw_enabled;
bf14e3b9
VG		 165#endif
166
167#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4
LT		 168extern int unaligned_enabled;
169#endif
1da177e4 170
d2b176ed 171#ifdef CONFIG_IA64
88fc241f 172extern int unaligned_dump_stack;
d2b176ed
JS		 173#endif
174
b6fca725
VG		 175#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
176extern int no_unaligned_warning;
177#endif
178
d6f8ff73 179#ifdef CONFIG_PROC_SYSCTL
f4aacea2 180
a19ac337
LR		 181/**
182 * enum sysctl_writes_mode - supported sysctl write modes
183 *
184 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
185 * to be written, and multiple writes on the same sysctl file descriptor
186 * will rewrite the sysctl value, regardless of file position. No warning
187 * is issued when the initial position is not 0.
188 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
189 * not 0.
190 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
191 * file position 0 and the value must be fully contained in the buffer
192 * sent to the write syscall. If dealing with strings respect the file
193 * position, but restrict this to the max length of the buffer, anything
194 * passed the max lenght will be ignored. Multiple writes will append
195 * to the buffer.
196 *
197 * These write modes control how current file position affects the behavior of
198 * updating sysctl values through the proc interface on each write.
199 */
200enum sysctl_writes_mode {
201 SYSCTL_WRITES_LEGACY = -1,
202 SYSCTL_WRITES_WARN = 0,
203 SYSCTL_WRITES_STRICT = 1,
204};
f4aacea2 205
a19ac337 206static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
f4aacea2 207
8d65af78 208static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 209 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 210static int proc_taint(struct ctl_table *table, int write,
34f5a398 211 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 212#endif
9ec52099 213
bfdc0b49 214#ifdef CONFIG_PRINTK
620f6e8e 215static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 216 void __user *buffer, size_t *lenp, loff_t *ppos);
217#endif
218
54b50199
KC		 219static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
220 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 221#ifdef CONFIG_COREDUMP
54b50199
KC		 222static int proc_dostring_coredump(struct ctl_table *table, int write,
223 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 224#endif
319e0a21
EB		 225static int proc_dopipe_max_size(struct ctl_table *table, int write,
226 void __user *buffer, size_t *lenp, loff_t *ppos);
3fcc5530 227#ifdef CONFIG_BPF_SYSCALL
492ecee8
AS		 228static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
229 void __user *buffer, size_t *lenp,
230 loff_t *ppos);
3fcc5530 231#endif
54b50199 232
97f5f0cd 233#ifdef CONFIG_MAGIC_SYSRQ
5f733e8a 234/* Note: sysrq code uses its own private copy */
8eaede49 235static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
97f5f0cd 236
6f8fd1d7 237static int sysrq_sysctl_handler(struct ctl_table *table, int write,
97f5f0cd
DT		 238 void __user *buffer, size_t *lenp,
239 loff_t *ppos)
240{
241 int error;
242
243 error = proc_dointvec(table, write, buffer, lenp, ppos);
244 if (error)
245 return error;
246
247 if (write)
248 sysrq_toggle_support(__sysrq_enabled);
249
250 return 0;
251}
252
253#endif
254
d8217f07
EB		 255static struct ctl_table kern_table[];
256static struct ctl_table vm_table[];
257static struct ctl_table fs_table[];
258static struct ctl_table debug_table[];
259static struct ctl_table dev_table[];
260extern struct ctl_table random_table[];
7ef9964e
DL		 261#ifdef CONFIG_EPOLL
262extern struct ctl_table epoll_table[];
263#endif
1da177e4 264
ceb18132
LR		 265#ifdef CONFIG_FW_LOADER_USER_HELPER
266extern struct ctl_table firmware_config_table[];
267#endif
268
1da177e4
LT		 269#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
270int sysctl_legacy_va_layout;
271#endif
272
1da177e4
LT		 273/* The default sysctl tables: */
274
de4e83bd 275static struct ctl_table sysctl_base_table[] = {
1da177e4 276 {
1da177e4
LT		 277 .procname = "kernel",
278 .mode = 0555,
279 .child = kern_table,
280 },
281 {
1da177e4
LT		 282 .procname = "vm",
283 .mode = 0555,
284 .child = vm_table,
285 },
1da177e4 286 {
1da177e4
LT		 287 .procname = "fs",
288 .mode = 0555,
289 .child = fs_table,
290 },
291 {
1da177e4
LT		 292 .procname = "debug",
293 .mode = 0555,
294 .child = debug_table,
295 },
296 {
1da177e4
LT		 297 .procname = "dev",
298 .mode = 0555,
299 .child = dev_table,
300 },
6fce56ec 301 { }
1da177e4
LT		 302};
303
77e54a1f 304#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 305static int min_sched_granularity_ns = 100000; /* 100 usecs */
306static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
307static int min_wakeup_granularity_ns; /* 0 usecs */
308static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
cbee9f88 309#ifdef CONFIG_SMP
1983a922
CE		 310static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
311static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
cbee9f88
PZ		 312#endif /* CONFIG_SMP */
313#endif /* CONFIG_SCHED_DEBUG */
77e54a1f 314
5e771905
MG		 315#ifdef CONFIG_COMPACTION
316static int min_extfrag_threshold;
317static int max_extfrag_threshold = 1000;
318#endif
319
d8217f07 320static struct ctl_table kern_table[] = {
2bba22c5 321 {
2bba22c5
MG		 322 .procname = "sched_child_runs_first",
323 .data = &sysctl_sched_child_runs_first,
324 .maxlen = sizeof(unsigned int),
325 .mode = 0644,
6d456111 326 .proc_handler = proc_dointvec,
2bba22c5 327 },
77e54a1f
IM		 328#ifdef CONFIG_SCHED_DEBUG
329 {
b2be5e96
PZ		 330 .procname = "sched_min_granularity_ns",
331 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 332 .maxlen = sizeof(unsigned int),
333 .mode = 0644,
702a7c76 334 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 335 .extra1 = &min_sched_granularity_ns,
336 .extra2 = &max_sched_granularity_ns,
77e54a1f 337 },
21805085 338 {
21805085
PZ		 339 .procname = "sched_latency_ns",
340 .data = &sysctl_sched_latency,
341 .maxlen = sizeof(unsigned int),
342 .mode = 0644,
702a7c76 343 .proc_handler = sched_proc_update_handler,
21805085
PZ		 344 .extra1 = &min_sched_granularity_ns,
345 .extra2 = &max_sched_granularity_ns,
346 },
77e54a1f 347 {
77e54a1f
IM		 348 .procname = "sched_wakeup_granularity_ns",
349 .data = &sysctl_sched_wakeup_granularity,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
702a7c76 352 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 353 .extra1 = &min_wakeup_granularity_ns,
354 .extra2 = &max_wakeup_granularity_ns,
355 },
cbee9f88 356#ifdef CONFIG_SMP
1983a922 357 {
1983a922
CE		 358 .procname = "sched_tunable_scaling",
359 .data = &sysctl_sched_tunable_scaling,
360 .maxlen = sizeof(enum sched_tunable_scaling),
361 .mode = 0644,
702a7c76 362 .proc_handler = sched_proc_update_handler,
1983a922
CE		 363 .extra1 = &min_sched_tunable_scaling,
364 .extra2 = &max_sched_tunable_scaling,
2398f2c6 365 },
da84d961 366 {
d00535db 367 .procname = "sched_migration_cost_ns",
da84d961
IM		 368 .data = &sysctl_sched_migration_cost,
369 .maxlen = sizeof(unsigned int),
370 .mode = 0644,
6d456111 371 .proc_handler = proc_dointvec,
da84d961 372 },
b82d9fdd 373 {
b82d9fdd
PZ		 374 .procname = "sched_nr_migrate",
375 .data = &sysctl_sched_nr_migrate,
376 .maxlen = sizeof(unsigned int),
fa85ae24 377 .mode = 0644,
6d456111 378 .proc_handler = proc_dointvec,
fa85ae24 379 },
cb251765
MG		 380#ifdef CONFIG_SCHEDSTATS
381 {
382 .procname = "sched_schedstats",
383 .data = NULL,
384 .maxlen = sizeof(unsigned int),
385 .mode = 0644,
386 .proc_handler = sysctl_schedstats,
387 .extra1 = &zero,
388 .extra2 = &one,
389 },
390#endif /* CONFIG_SCHEDSTATS */
cbee9f88
PZ		 391#endif /* CONFIG_SMP */
392#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 393 {
394 .procname = "numa_balancing_scan_delay_ms",
395 .data = &sysctl_numa_balancing_scan_delay,
396 .maxlen = sizeof(unsigned int),
397 .mode = 0644,
398 .proc_handler = proc_dointvec,
399 },
cbee9f88
PZ		 400 {
401 .procname = "numa_balancing_scan_period_min_ms",
402 .data = &sysctl_numa_balancing_scan_period_min,
403 .maxlen = sizeof(unsigned int),
404 .mode = 0644,
405 .proc_handler = proc_dointvec,
406 },
407 {
408 .procname = "numa_balancing_scan_period_max_ms",
409 .data = &sysctl_numa_balancing_scan_period_max,
410 .maxlen = sizeof(unsigned int),
411 .mode = 0644,
412 .proc_handler = proc_dointvec,
413 },
6e5fb223
PZ		 414 {
415 .procname = "numa_balancing_scan_size_mb",
416 .data = &sysctl_numa_balancing_scan_size,
417 .maxlen = sizeof(unsigned int),
418 .mode = 0644,
64192658
KT		 419 .proc_handler = proc_dointvec_minmax,
420 .extra1 = &one,
6e5fb223 421 },
54a43d54
AK		 422 {
423 .procname = "numa_balancing",
424 .data = NULL, /* filled in by handler */
425 .maxlen = sizeof(unsigned int),
426 .mode = 0644,
427 .proc_handler = sysctl_numa_balancing,
428 .extra1 = &zero,
429 .extra2 = &one,
430 },
cbee9f88
PZ		 431#endif /* CONFIG_NUMA_BALANCING */
432#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 433 {
9f0c1e56
PZ		 434 .procname = "sched_rt_period_us",
435 .data = &sysctl_sched_rt_period,
436 .maxlen = sizeof(unsigned int),
437 .mode = 0644,
6d456111 438 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 439 },
440 {
9f0c1e56
PZ		 441 .procname = "sched_rt_runtime_us",
442 .data = &sysctl_sched_rt_runtime,
443 .maxlen = sizeof(int),
444 .mode = 0644,
6d456111 445 .proc_handler = sched_rt_handler,
9f0c1e56 446 },
ce0dbbbb
CW		 447 {
448 .procname = "sched_rr_timeslice_ms",
975e155e 449 .data = &sysctl_sched_rr_timeslice,
ce0dbbbb
CW		 450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = sched_rr_handler,
453 },
5091faa4
MG		 454#ifdef CONFIG_SCHED_AUTOGROUP
455 {
456 .procname = "sched_autogroup_enabled",
457 .data = &sysctl_sched_autogroup_enabled,
458 .maxlen = sizeof(unsigned int),
459 .mode = 0644,
1747b21f 460 .proc_handler = proc_dointvec_minmax,
5091faa4
MG		 461 .extra1 = &zero,
462 .extra2 = &one,
463 },
464#endif
ec12cb7f
PT		 465#ifdef CONFIG_CFS_BANDWIDTH
466 {
467 .procname = "sched_cfs_bandwidth_slice_us",
468 .data = &sysctl_sched_cfs_bandwidth_slice,
469 .maxlen = sizeof(unsigned int),
470 .mode = 0644,
471 .proc_handler = proc_dointvec_minmax,
472 .extra1 = &one,
473 },
474#endif
f20786ff
PZ		 475#ifdef CONFIG_PROVE_LOCKING
476 {
f20786ff
PZ		 477 .procname = "prove_locking",
478 .data = &prove_locking,
479 .maxlen = sizeof(int),
480 .mode = 0644,
6d456111 481 .proc_handler = proc_dointvec,
f20786ff
PZ		 482 },
483#endif
484#ifdef CONFIG_LOCK_STAT
485 {
f20786ff
PZ		 486 .procname = "lock_stat",
487 .data = &lock_stat,
488 .maxlen = sizeof(int),
489 .mode = 0644,
6d456111 490 .proc_handler = proc_dointvec,
f20786ff 491 },
77e54a1f 492#endif
1da177e4 493 {
1da177e4
LT		 494 .procname = "panic",
495 .data = &panic_timeout,
496 .maxlen = sizeof(int),
497 .mode = 0644,
6d456111 498 .proc_handler = proc_dointvec,
1da177e4 499 },
046d662f 500#ifdef CONFIG_COREDUMP
1da177e4 501 {
1da177e4
LT		 502 .procname = "core_uses_pid",
503 .data = &core_uses_pid,
504 .maxlen = sizeof(int),
505 .mode = 0644,
6d456111 506 .proc_handler = proc_dointvec,
1da177e4
LT		 507 },
508 {
1da177e4
LT		 509 .procname = "core_pattern",
510 .data = core_pattern,
71ce92f3 511 .maxlen = CORENAME_MAX_SIZE,
1da177e4 512 .mode = 0644,
54b50199 513 .proc_handler = proc_dostring_coredump,
1da177e4 514 },
a293980c 515 {
a293980c
NH		 516 .procname = "core_pipe_limit",
517 .data = &core_pipe_limit,
518 .maxlen = sizeof(unsigned int),
519 .mode = 0644,
6d456111 520 .proc_handler = proc_dointvec,
a293980c 521 },
046d662f 522#endif
34f5a398 523#ifdef CONFIG_PROC_SYSCTL
1da177e4 524 {
1da177e4 525 .procname = "tainted",
25ddbb18 526 .maxlen = sizeof(long),
34f5a398 527 .mode = 0644,
6d456111 528 .proc_handler = proc_taint,
1da177e4 529 },
f4aacea2
KC		 530 {
531 .procname = "sysctl_writes_strict",
532 .data = &sysctl_writes_strict,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec_minmax,
536 .extra1 = &neg_one,
537 .extra2 = &one,
538 },
34f5a398 539#endif
9745512c
AV		 540#ifdef CONFIG_LATENCYTOP
541 {
542 .procname = "latencytop",
543 .data = &latencytop_enabled,
544 .maxlen = sizeof(int),
545 .mode = 0644,
cb251765 546 .proc_handler = sysctl_latencytop,
9745512c
AV		 547 },
548#endif
1da177e4
LT		 549#ifdef CONFIG_BLK_DEV_INITRD
550 {
1da177e4
LT		 551 .procname = "real-root-dev",
552 .data = &real_root_dev,
553 .maxlen = sizeof(int),
554 .mode = 0644,
6d456111 555 .proc_handler = proc_dointvec,
1da177e4
LT		 556 },
557#endif
45807a1d 558 {
45807a1d
IM		 559 .procname = "print-fatal-signals",
560 .data = &print_fatal_signals,
561 .maxlen = sizeof(int),
562 .mode = 0644,
6d456111 563 .proc_handler = proc_dointvec,
45807a1d 564 },
72c57ed5 565#ifdef CONFIG_SPARC
1da177e4 566 {
1da177e4
LT		 567 .procname = "reboot-cmd",
568 .data = reboot_command,
569 .maxlen = 256,
570 .mode = 0644,
6d456111 571 .proc_handler = proc_dostring,
1da177e4
LT		 572 },
573 {
1da177e4
LT		 574 .procname = "stop-a",
575 .data = &stop_a_enabled,
576 .maxlen = sizeof (int),
577 .mode = 0644,
6d456111 578 .proc_handler = proc_dointvec,
1da177e4
LT		 579 },
580 {
1da177e4
LT		 581 .procname = "scons-poweroff",
582 .data = &scons_pwroff,
583 .maxlen = sizeof (int),
584 .mode = 0644,
6d456111 585 .proc_handler = proc_dointvec,
1da177e4
LT		 586 },
587#endif
0871420f
DM		 588#ifdef CONFIG_SPARC64
589 {
0871420f
DM		 590 .procname = "tsb-ratio",
591 .data = &sysctl_tsb_ratio,
592 .maxlen = sizeof (int),
593 .mode = 0644,
6d456111 594 .proc_handler = proc_dointvec,
0871420f
DM		 595 },
596#endif
1da177e4
LT		 597#ifdef __hppa__
598 {
1da177e4
LT		 599 .procname = "soft-power",
600 .data = &pwrsw_enabled,
601 .maxlen = sizeof (int),
602 .mode = 0644,
6d456111 603 .proc_handler = proc_dointvec,
1da177e4 604 },
bf14e3b9
VG		 605#endif
606#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 607 {
1da177e4
LT		 608 .procname = "unaligned-trap",
609 .data = &unaligned_enabled,
610 .maxlen = sizeof (int),
611 .mode = 0644,
6d456111 612 .proc_handler = proc_dointvec,
1da177e4
LT		 613 },
614#endif
615 {
1da177e4
LT		 616 .procname = "ctrl-alt-del",
617 .data = &C_A_D,
618 .maxlen = sizeof(int),
619 .mode = 0644,
6d456111 620 .proc_handler = proc_dointvec,
1da177e4 621 },
606576ce 622#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 623 {
b0fc494f
SR		 624 .procname = "ftrace_enabled",
625 .data = &ftrace_enabled,
626 .maxlen = sizeof(int),
627 .mode = 0644,
6d456111 628 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 629 },
630#endif
f38f1d2a
SR		 631#ifdef CONFIG_STACK_TRACER
632 {
f38f1d2a
SR		 633 .procname = "stack_tracer_enabled",
634 .data = &stack_tracer_enabled,
635 .maxlen = sizeof(int),
636 .mode = 0644,
6d456111 637 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 638 },
639#endif
944ac425
SR		 640#ifdef CONFIG_TRACING
641 {
3299b4dd 642 .procname = "ftrace_dump_on_oops",
944ac425
SR		 643 .data = &ftrace_dump_on_oops,
644 .maxlen = sizeof(int),
645 .mode = 0644,
6d456111 646 .proc_handler = proc_dointvec,
944ac425 647 },
de7edd31
SRRH		 648 {
649 .procname = "traceoff_on_warning",
650 .data = &__disable_trace_on_warning,
651 .maxlen = sizeof(__disable_trace_on_warning),
652 .mode = 0644,
653 .proc_handler = proc_dointvec,
654 },
0daa2302
SRRH		 655 {
656 .procname = "tracepoint_printk",
657 .data = &tracepoint_printk,
658 .maxlen = sizeof(tracepoint_printk),
659 .mode = 0644,
42391745 660 .proc_handler = tracepoint_printk_sysctl,
0daa2302 661 },
944ac425 662#endif
2965faa5 663#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 664 {
665 .procname = "kexec_load_disabled",
666 .data = &kexec_load_disabled,
667 .maxlen = sizeof(int),
668 .mode = 0644,
669 /* only handle a transition from default "0" to "1" */
670 .proc_handler = proc_dointvec_minmax,
671 .extra1 = &one,
672 .extra2 = &one,
673 },
674#endif
a1ef5adb 675#ifdef CONFIG_MODULES
1da177e4 676 {
1da177e4
LT		 677 .procname = "modprobe",
678 .data = &modprobe_path,
679 .maxlen = KMOD_PATH_LEN,
680 .mode = 0644,
6d456111 681 .proc_handler = proc_dostring,
1da177e4 682 },
3d43321b 683 {
3d43321b
KC		 684 .procname = "modules_disabled",
685 .data = &modules_disabled,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 /* only handle a transition from default "0" to "1" */
6d456111 689 .proc_handler = proc_dointvec_minmax,
3d43321b
KC		 690 .extra1 = &one,
691 .extra2 = &one,
692 },
1da177e4 693#endif
86d56134 694#ifdef CONFIG_UEVENT_HELPER
1da177e4 695 {
1da177e4 696 .procname = "hotplug",
312c004d
KS		 697 .data = &uevent_helper,
698 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 699 .mode = 0644,
6d456111 700 .proc_handler = proc_dostring,
1da177e4 701 },
86d56134 702#endif
1da177e4
LT		 703#ifdef CONFIG_CHR_DEV_SG
704 {
1da177e4
LT		 705 .procname = "sg-big-buff",
706 .data = &sg_big_buff,
707 .maxlen = sizeof (int),
708 .mode = 0444,
6d456111 709 .proc_handler = proc_dointvec,
1da177e4
LT		 710 },
711#endif
712#ifdef CONFIG_BSD_PROCESS_ACCT
713 {
1da177e4
LT		 714 .procname = "acct",
715 .data = &acct_parm,
716 .maxlen = 3*sizeof(int),
717 .mode = 0644,
6d456111 718 .proc_handler = proc_dointvec,
1da177e4
LT		 719 },
720#endif
1da177e4
LT		 721#ifdef CONFIG_MAGIC_SYSRQ
722 {
1da177e4 723 .procname = "sysrq",
5d6f647f 724 .data = &__sysrq_enabled,
1da177e4
LT		 725 .maxlen = sizeof (int),
726 .mode = 0644,
97f5f0cd 727 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 728 },
729#endif
d6f8ff73 730#ifdef CONFIG_PROC_SYSCTL
1da177e4 731 {
1da177e4 732 .procname = "cad_pid",
9ec52099 733 .data = NULL,
1da177e4
LT		 734 .maxlen = sizeof (int),
735 .mode = 0600,
6d456111 736 .proc_handler = proc_do_cad_pid,
1da177e4 737 },
d6f8ff73 738#endif
1da177e4 739 {
1da177e4 740 .procname = "threads-max",
16db3d3f 741 .data = NULL,
1da177e4
LT		 742 .maxlen = sizeof(int),
743 .mode = 0644,
16db3d3f 744 .proc_handler = sysctl_max_threads,
1da177e4
LT		 745 },
746 {
1da177e4
LT		 747 .procname = "random",
748 .mode = 0555,
749 .child = random_table,
750 },
17f60a7d
EP		 751 {
752 .procname = "usermodehelper",
753 .mode = 0555,
754 .child = usermodehelper_table,
755 },
ceb18132
LR		 756#ifdef CONFIG_FW_LOADER_USER_HELPER
757 {
758 .procname = "firmware_config",
759 .mode = 0555,
760 .child = firmware_config_table,
761 },
762#endif
1da177e4 763 {
1da177e4
LT		 764 .procname = "overflowuid",
765 .data = &overflowuid,
766 .maxlen = sizeof(int),
767 .mode = 0644,
6d456111 768 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 769 .extra1 = &minolduid,
770 .extra2 = &maxolduid,
771 },
772 {
1da177e4
LT		 773 .procname = "overflowgid",
774 .data = &overflowgid,
775 .maxlen = sizeof(int),
776 .mode = 0644,
6d456111 777 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 778 .extra1 = &minolduid,
779 .extra2 = &maxolduid,
780 },
347a8dc3 781#ifdef CONFIG_S390
1da177e4
LT		 782#ifdef CONFIG_MATHEMU
783 {
1da177e4
LT		 784 .procname = "ieee_emulation_warnings",
785 .data = &sysctl_ieee_emulation_warnings,
786 .maxlen = sizeof(int),
787 .mode = 0644,
6d456111 788 .proc_handler = proc_dointvec,
1da177e4 789 },
1da177e4
LT		 790#endif
791 {
1da177e4 792 .procname = "userprocess_debug",
ab3c68ee 793 .data = &show_unhandled_signals,
1da177e4
LT		 794 .maxlen = sizeof(int),
795 .mode = 0644,
6d456111 796 .proc_handler = proc_dointvec,
1da177e4
LT		 797 },
798#endif
799 {
1da177e4
LT		 800 .procname = "pid_max",
801 .data = &pid_max,
802 .maxlen = sizeof (int),
803 .mode = 0644,
6d456111 804 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 805 .extra1 = &pid_max_min,
806 .extra2 = &pid_max_max,
807 },
808 {
1da177e4
LT		 809 .procname = "panic_on_oops",
810 .data = &panic_on_oops,
811 .maxlen = sizeof(int),
812 .mode = 0644,
6d456111 813 .proc_handler = proc_dointvec,
1da177e4 814 },
81c9d43f
FT		 815 {
816 .procname = "panic_print",
817 .data = &panic_print,
818 .maxlen = sizeof(unsigned long),
819 .mode = 0644,
820 .proc_handler = proc_doulongvec_minmax,
821 },
7ef3d2fd
JP		 822#if defined CONFIG_PRINTK
823 {
7ef3d2fd
JP		 824 .procname = "printk",
825 .data = &console_loglevel,
826 .maxlen = 4*sizeof(int),
827 .mode = 0644,
6d456111 828 .proc_handler = proc_dointvec,
7ef3d2fd 829 },
1da177e4 830 {
1da177e4 831 .procname = "printk_ratelimit",
717115e1 832 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 833 .maxlen = sizeof(int),
834 .mode = 0644,
6d456111 835 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 836 },
837 {
1da177e4 838 .procname = "printk_ratelimit_burst",
717115e1 839 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 840 .maxlen = sizeof(int),
841 .mode = 0644,
6d456111 842 .proc_handler = proc_dointvec,
1da177e4 843 },
af91322e 844 {
af91322e
DY		 845 .procname = "printk_delay",
846 .data = &printk_delay_msec,
847 .maxlen = sizeof(int),
848 .mode = 0644,
6d456111 849 .proc_handler = proc_dointvec_minmax,
af91322e
DY		 850 .extra1 = &zero,
851 .extra2 = &ten_thousand,
852 },
750afe7b
BP		 853 {
854 .procname = "printk_devkmsg",
855 .data = devkmsg_log_str,
856 .maxlen = DEVKMSG_STR_MAX_SIZE,
857 .mode = 0644,
858 .proc_handler = devkmsg_sysctl_set_loglvl,
859 },
eaf06b24
DR		 860 {
861 .procname = "dmesg_restrict",
862 .data = &dmesg_restrict,
863 .maxlen = sizeof(int),
864 .mode = 0644,
620f6e8e 865 .proc_handler = proc_dointvec_minmax_sysadmin,
eaf06b24
DR		 866 .extra1 = &zero,
867 .extra2 = &one,
868 },
455cd5ab
DR		 869 {
870 .procname = "kptr_restrict",
871 .data = &kptr_restrict,
872 .maxlen = sizeof(int),
873 .mode = 0644,
620f6e8e 874 .proc_handler = proc_dointvec_minmax_sysadmin,
455cd5ab
DR		 875 .extra1 = &zero,
876 .extra2 = &two,
877 },
df6e61d4 878#endif
1da177e4 879 {
1da177e4
LT		 880 .procname = "ngroups_max",
881 .data = &ngroups_max,
882 .maxlen = sizeof (int),
883 .mode = 0444,
6d456111 884 .proc_handler = proc_dointvec,
1da177e4 885 },
73efc039
DB		 886 {
887 .procname = "cap_last_cap",
888 .data = (void *)&cap_last_cap,
889 .maxlen = sizeof(int),
890 .mode = 0444,
891 .proc_handler = proc_dointvec,
892 },
58687acb 893#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 894 {
58687acb 895 .procname = "watchdog",
7feeb9cd
TG		 896 .data = &watchdog_user_enabled,
897 .maxlen = sizeof(int),
898 .mode = 0644,
195daf66 899 .proc_handler = proc_watchdog,
586692a5
MSB		 900 .extra1 = &zero,
901 .extra2 = &one,
58687acb
DZ		 902 },
903 {
904 .procname = "watchdog_thresh",
586692a5 905 .data = &watchdog_thresh,
58687acb
DZ		 906 .maxlen = sizeof(int),
907 .mode = 0644,
195daf66 908 .proc_handler = proc_watchdog_thresh,
a6572f84 909 .extra1 = &zero,
58687acb 910 .extra2 = &sixty,
504d7cf1 911 },
195daf66
UO		 912 {
913 .procname = "nmi_watchdog",
7feeb9cd
TG		 914 .data = &nmi_watchdog_user_enabled,
915 .maxlen = sizeof(int),
51d4052b 916 .mode = NMI_WATCHDOG_SYSCTL_PERM,
195daf66
UO		 917 .proc_handler = proc_nmi_watchdog,
918 .extra1 = &zero,
195daf66 919 .extra2 = &one,
195daf66 920 },
05a4a952
NP		 921 {
922 .procname = "watchdog_cpumask",
923 .data = &watchdog_cpumask_bits,
924 .maxlen = NR_CPUS,
925 .mode = 0644,
926 .proc_handler = proc_watchdog_cpumask,
927 },
928#ifdef CONFIG_SOFTLOCKUP_DETECTOR
195daf66
UO		 929 {
930 .procname = "soft_watchdog",
7feeb9cd
TG		 931 .data = &soft_watchdog_user_enabled,
932 .maxlen = sizeof(int),
933 .mode = 0644,
195daf66
UO		 934 .proc_handler = proc_soft_watchdog,
935 .extra1 = &zero,
936 .extra2 = &one,
937 },
2508ce18
DZ		 938 {
939 .procname = "softlockup_panic",
940 .data = &softlockup_panic,
941 .maxlen = sizeof(int),
942 .mode = 0644,
943 .proc_handler = proc_dointvec_minmax,
944 .extra1 = &zero,
945 .extra2 = &one,
946 },
05a4a952 947#ifdef CONFIG_SMP
ac1f5912 948 {
05a4a952
NP		 949 .procname = "softlockup_all_cpu_backtrace",
950 .data = &sysctl_softlockup_all_cpu_backtrace,
ac1f5912
DZ		 951 .maxlen = sizeof(int),
952 .mode = 0644,
953 .proc_handler = proc_dointvec_minmax,
954 .extra1 = &zero,
955 .extra2 = &one,
956 },
05a4a952 957#endif /* CONFIG_SMP */
ac1f5912 958#endif
05a4a952 959#ifdef CONFIG_HARDLOCKUP_DETECTOR
ed235875 960 {
05a4a952
NP		 961 .procname = "hardlockup_panic",
962 .data = &hardlockup_panic,
ed235875
AT		 963 .maxlen = sizeof(int),
964 .mode = 0644,
965 .proc_handler = proc_dointvec_minmax,
966 .extra1 = &zero,
967 .extra2 = &one,
968 },
05a4a952 969#ifdef CONFIG_SMP
55537871
JK		 970 {
971 .procname = "hardlockup_all_cpu_backtrace",
972 .data = &sysctl_hardlockup_all_cpu_backtrace,
973 .maxlen = sizeof(int),
974 .mode = 0644,
975 .proc_handler = proc_dointvec_minmax,
976 .extra1 = &zero,
977 .extra2 = &one,
978 },
ed235875 979#endif /* CONFIG_SMP */
5dc30558 980#endif
05a4a952
NP		 981#endif
982
5dc30558
DZ		 983#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
984 {
985 .procname = "unknown_nmi_panic",
986 .data = &unknown_nmi_panic,
987 .maxlen = sizeof (int),
988 .mode = 0644,
989 .proc_handler = proc_dointvec,
990 },
504d7cf1 991#endif
1da177e4 992#if defined(CONFIG_X86)
8da5adda 993 {
8da5adda
DZ		 994 .procname = "panic_on_unrecovered_nmi",
995 .data = &panic_on_unrecovered_nmi,
996 .maxlen = sizeof(int),
997 .mode = 0644,
6d456111 998 .proc_handler = proc_dointvec,
8da5adda 999 },
5211a242 1000 {
5211a242
KG		 1001 .procname = "panic_on_io_nmi",
1002 .data = &panic_on_io_nmi,
1003 .maxlen = sizeof(int),
1004 .mode = 0644,
6d456111 1005 .proc_handler = proc_dointvec,
5211a242 1006 },
55af7796
MH		 1007#ifdef CONFIG_DEBUG_STACKOVERFLOW
1008 {
1009 .procname = "panic_on_stackoverflow",
1010 .data = &sysctl_panic_on_stackoverflow,
1011 .maxlen = sizeof(int),
1012 .mode = 0644,
1013 .proc_handler = proc_dointvec,
1014 },
1015#endif
1da177e4 1016 {
1da177e4
LT		 1017 .procname = "bootloader_type",
1018 .data = &bootloader_type,
1019 .maxlen = sizeof (int),
1020 .mode = 0444,
6d456111 1021 .proc_handler = proc_dointvec,
1da177e4 1022 },
5031296c 1023 {
5031296c
PA		 1024 .procname = "bootloader_version",
1025 .data = &bootloader_version,
1026 .maxlen = sizeof (int),
1027 .mode = 0444,
6d456111 1028 .proc_handler = proc_dointvec,
5031296c 1029 },
6e7c4025 1030 {
6e7c4025
IM		 1031 .procname = "io_delay_type",
1032 .data = &io_delay_type,
1033 .maxlen = sizeof(int),
1034 .mode = 0644,
6d456111 1035 .proc_handler = proc_dointvec,
6e7c4025 1036 },
1da177e4 1037#endif
7a9166e3 1038#if defined(CONFIG_MMU)
1da177e4 1039 {
1da177e4
LT		 1040 .procname = "randomize_va_space",
1041 .data = &randomize_va_space,
1042 .maxlen = sizeof(int),
1043 .mode = 0644,
6d456111 1044 .proc_handler = proc_dointvec,
1da177e4 1045 },
7a9166e3 1046#endif
0152fb37 1047#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1048 {
951f22d5
MS		 1049 .procname = "spin_retry",
1050 .data = &spin_retry,
1051 .maxlen = sizeof (int),
1052 .mode = 0644,
6d456111 1053 .proc_handler = proc_dointvec,
951f22d5 1054 },
c255d844 1055#endif
673d5b43 1056#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1057 {
c255d844 1058 .procname = "acpi_video_flags",
77afcf78 1059 .data = &acpi_realmode_flags,
c255d844
PM		 1060 .maxlen = sizeof (unsigned long),
1061 .mode = 0644,
6d456111 1062 .proc_handler = proc_doulongvec_minmax,
c255d844 1063 },
d2b176ed 1064#endif
b6fca725 1065#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1066 {
d2b176ed
JS		 1067 .procname = "ignore-unaligned-usertrap",
1068 .data = &no_unaligned_warning,
1069 .maxlen = sizeof (int),
1070 .mode = 0644,
6d456111 1071 .proc_handler = proc_dointvec,
d2b176ed 1072 },
b6fca725
VG		 1073#endif
1074#ifdef CONFIG_IA64
88fc241f 1075 {
88fc241f
DC		 1076 .procname = "unaligned-dump-stack",
1077 .data = &unaligned_dump_stack,
1078 .maxlen = sizeof (int),
1079 .mode = 0644,
6d456111 1080 .proc_handler = proc_dointvec,
88fc241f 1081 },
bebfa101 1082#endif
e162b39a
MSB		 1083#ifdef CONFIG_DETECT_HUNG_TASK
1084 {
e162b39a
MSB		 1085 .procname = "hung_task_panic",
1086 .data = &sysctl_hung_task_panic,
1087 .maxlen = sizeof(int),
1088 .mode = 0644,
6d456111 1089 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 1090 .extra1 = &zero,
1091 .extra2 = &one,
1092 },
82a1fcb9 1093 {
82a1fcb9
IM		 1094 .procname = "hung_task_check_count",
1095 .data = &sysctl_hung_task_check_count,
cd64647f 1096 .maxlen = sizeof(int),
82a1fcb9 1097 .mode = 0644,
cd64647f
LZ		 1098 .proc_handler = proc_dointvec_minmax,
1099 .extra1 = &zero,
82a1fcb9
IM		 1100 },
1101 {
82a1fcb9
IM		 1102 .procname = "hung_task_timeout_secs",
1103 .data = &sysctl_hung_task_timeout_secs,
90739081 1104 .maxlen = sizeof(unsigned long),
82a1fcb9 1105 .mode = 0644,
6d456111 1106 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1107 .extra2 = &hung_task_timeout_max,
82a1fcb9 1108 },
a2e51445
DV		 1109 {
1110 .procname = "hung_task_check_interval_secs",
1111 .data = &sysctl_hung_task_check_interval_secs,
1112 .maxlen = sizeof(unsigned long),
1113 .mode = 0644,
1114 .proc_handler = proc_dohung_task_timeout_secs,
1115 .extra2 = &hung_task_timeout_max,
1116 },
82a1fcb9 1117 {
82a1fcb9
IM		 1118 .procname = "hung_task_warnings",
1119 .data = &sysctl_hung_task_warnings,
270750db 1120 .maxlen = sizeof(int),
82a1fcb9 1121 .mode = 0644,
270750db
AT		 1122 .proc_handler = proc_dointvec_minmax,
1123 .extra1 = &neg_one,
82a1fcb9 1124 },
c4f3b63f 1125#endif
23f78d4a
IM		 1126#ifdef CONFIG_RT_MUTEXES
1127 {
23f78d4a
IM		 1128 .procname = "max_lock_depth",
1129 .data = &max_lock_depth,
1130 .maxlen = sizeof(int),
1131 .mode = 0644,
6d456111 1132 .proc_handler = proc_dointvec,
23f78d4a 1133 },
5096add8 1134#endif
10a0a8d4 1135 {
10a0a8d4
JF		 1136 .procname = "poweroff_cmd",
1137 .data = &poweroff_cmd,
1138 .maxlen = POWEROFF_CMD_PATH_LEN,
1139 .mode = 0644,
6d456111 1140 .proc_handler = proc_dostring,
10a0a8d4 1141 },
0b77f5bf
DH		 1142#ifdef CONFIG_KEYS
1143 {
0b77f5bf
DH		 1144 .procname = "keys",
1145 .mode = 0555,
1146 .child = key_sysctls,
1147 },
1148#endif
cdd6c482 1149#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1150 /*
1151 * User-space scripts rely on the existence of this file
1152 * as a feature check for perf_events being enabled.
1153 *
1154 * So it's an ABI, do not remove!
1155 */
1ccd1549 1156 {
cdd6c482
IM		 1157 .procname = "perf_event_paranoid",
1158 .data = &sysctl_perf_event_paranoid,
1159 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1160 .mode = 0644,
6d456111 1161 .proc_handler = proc_dointvec,
1ccd1549 1162 },
c5078f78 1163 {
cdd6c482
IM		 1164 .procname = "perf_event_mlock_kb",
1165 .data = &sysctl_perf_event_mlock,
1166 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1167 .mode = 0644,
6d456111 1168 .proc_handler = proc_dointvec,
c5078f78 1169 },
a78ac325 1170 {
cdd6c482
IM		 1171 .procname = "perf_event_max_sample_rate",
1172 .data = &sysctl_perf_event_sample_rate,
1173 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1174 .mode = 0644,
163ec435 1175 .proc_handler = perf_proc_update_handler,
723478c8 1176 .extra1 = &one,
a78ac325 1177 },
14c63f17
DH		 1178 {
1179 .procname = "perf_cpu_time_max_percent",
1180 .data = &sysctl_perf_cpu_time_max_percent,
1181 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1182 .mode = 0644,
1183 .proc_handler = perf_cpu_time_max_percent_handler,
1184 .extra1 = &zero,
1185 .extra2 = &one_hundred,
1186 },
c5dfd78e
ACM		 1187 {
1188 .procname = "perf_event_max_stack",
a831100a 1189 .data = &sysctl_perf_event_max_stack,
c5dfd78e
ACM		 1190 .maxlen = sizeof(sysctl_perf_event_max_stack),
1191 .mode = 0644,
1192 .proc_handler = perf_event_max_stack_handler,
1193 .extra1 = &zero,
1194 .extra2 = &six_hundred_forty_kb,
1195 },
c85b0334
ACM		 1196 {
1197 .procname = "perf_event_max_contexts_per_stack",
1198 .data = &sysctl_perf_event_max_contexts_per_stack,
1199 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1200 .mode = 0644,
1201 .proc_handler = perf_event_max_stack_handler,
1202 .extra1 = &zero,
1203 .extra2 = &one_thousand,
1204 },
cb684b5b 1205#endif
9e3961a0
PB		 1206 {
1207 .procname = "panic_on_warn",
1208 .data = &panic_on_warn,
1209 .maxlen = sizeof(int),
1210 .mode = 0644,
1211 .proc_handler = proc_dointvec_minmax,
1212 .extra1 = &zero,
1213 .extra2 = &one,
1214 },
bc7a34b8
TG		 1215#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1216 {
1217 .procname = "timer_migration",
1218 .data = &sysctl_timer_migration,
1219 .maxlen = sizeof(unsigned int),
1220 .mode = 0644,
1221 .proc_handler = timer_migration_handler,
b94bf594
MJ		 1222 .extra1 = &zero,
1223 .extra2 = &one,
bc7a34b8 1224 },
1be7f75d
AS		 1225#endif
1226#ifdef CONFIG_BPF_SYSCALL
1227 {
1228 .procname = "unprivileged_bpf_disabled",
1229 .data = &sysctl_unprivileged_bpf_disabled,
1230 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1231 .mode = 0644,
1232 /* only handle a transition from default "0" to "1" */
1233 .proc_handler = proc_dointvec_minmax,
1234 .extra1 = &one,
1235 .extra2 = &one,
1236 },
492ecee8
AS		 1237 {
1238 .procname = "bpf_stats_enabled",
1239 .data = &sysctl_bpf_stats_enabled,
1240 .maxlen = sizeof(sysctl_bpf_stats_enabled),
1241 .mode = 0644,
1242 .proc_handler = proc_dointvec_minmax_bpf_stats,
1243 .extra1 = &zero,
1244 .extra2 = &one,
1245 },
3fcc5530 1246#endif
088e9d25
DBO		 1247#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1248 {
1249 .procname = "panic_on_rcu_stall",
1250 .data = &sysctl_panic_on_rcu_stall,
1251 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1252 .mode = 0644,
1253 .proc_handler = proc_dointvec_minmax,
1254 .extra1 = &zero,
1255 .extra2 = &one,
1256 },
964c9dff
AP		 1257#endif
1258#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1259 {
1260 .procname = "stack_erasing",
1261 .data = NULL,
1262 .maxlen = sizeof(int),
1263 .mode = 0600,
1264 .proc_handler = stack_erasing_sysctl,
1265 .extra1 = &zero,
1266 .extra2 = &one,
1267 },
bc7a34b8 1268#endif
6fce56ec 1269 { }
1da177e4
LT		 1270};
1271
d8217f07 1272static struct ctl_table vm_table[] = {
1da177e4 1273 {
1da177e4
LT		 1274 .procname = "overcommit_memory",
1275 .data = &sysctl_overcommit_memory,
1276 .maxlen = sizeof(sysctl_overcommit_memory),
1277 .mode = 0644,
cb16e95f
PH		 1278 .proc_handler = proc_dointvec_minmax,
1279 .extra1 = &zero,
1280 .extra2 = &two,
1da177e4 1281 },
fadd8fbd 1282 {
fadd8fbd
KH		 1283 .procname = "panic_on_oom",
1284 .data = &sysctl_panic_on_oom,
1285 .maxlen = sizeof(sysctl_panic_on_oom),
1286 .mode = 0644,
cb16e95f
PH		 1287 .proc_handler = proc_dointvec_minmax,
1288 .extra1 = &zero,
1289 .extra2 = &two,
fadd8fbd 1290 },
fe071d7e 1291 {
fe071d7e
DR		 1292 .procname = "oom_kill_allocating_task",
1293 .data = &sysctl_oom_kill_allocating_task,
1294 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1295 .mode = 0644,
6d456111 1296 .proc_handler = proc_dointvec,
fe071d7e 1297 },
fef1bdd6 1298 {
fef1bdd6
DR		 1299 .procname = "oom_dump_tasks",
1300 .data = &sysctl_oom_dump_tasks,
1301 .maxlen = sizeof(sysctl_oom_dump_tasks),
1302 .mode = 0644,
6d456111 1303 .proc_handler = proc_dointvec,
fef1bdd6 1304 },
1da177e4 1305 {
1da177e4
LT		 1306 .procname = "overcommit_ratio",
1307 .data = &sysctl_overcommit_ratio,
1308 .maxlen = sizeof(sysctl_overcommit_ratio),
1309 .mode = 0644,
49f0ce5f
JM		 1310 .proc_handler = overcommit_ratio_handler,
1311 },
1312 {
1313 .procname = "overcommit_kbytes",
1314 .data = &sysctl_overcommit_kbytes,
1315 .maxlen = sizeof(sysctl_overcommit_kbytes),
1316 .mode = 0644,
1317 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1318 },
1319 {
1da177e4
LT		 1320 .procname = "page-cluster",
1321 .data = &page_cluster,
1322 .maxlen = sizeof(int),
1323 .mode = 0644,
cb16e95f
PH		 1324 .proc_handler = proc_dointvec_minmax,
1325 .extra1 = &zero,
1da177e4
LT		 1326 },
1327 {
1da177e4
LT		 1328 .procname = "dirty_background_ratio",
1329 .data = &dirty_background_ratio,
1330 .maxlen = sizeof(dirty_background_ratio),
1331 .mode = 0644,
6d456111 1332 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1333 .extra1 = &zero,
1334 .extra2 = &one_hundred,
1335 },
2da02997 1336 {
2da02997
DR		 1337 .procname = "dirty_background_bytes",
1338 .data = &dirty_background_bytes,
1339 .maxlen = sizeof(dirty_background_bytes),
1340 .mode = 0644,
6d456111 1341 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1342 .extra1 = &one_ul,
2da02997 1343 },
1da177e4 1344 {
1da177e4
LT		 1345 .procname = "dirty_ratio",
1346 .data = &vm_dirty_ratio,
1347 .maxlen = sizeof(vm_dirty_ratio),
1348 .mode = 0644,
6d456111 1349 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1350 .extra1 = &zero,
1351 .extra2 = &one_hundred,
1352 },
2da02997 1353 {
2da02997
DR		 1354 .procname = "dirty_bytes",
1355 .data = &vm_dirty_bytes,
1356 .maxlen = sizeof(vm_dirty_bytes),
1357 .mode = 0644,
6d456111 1358 .proc_handler = dirty_bytes_handler,
9e4a5bda 1359 .extra1 = &dirty_bytes_min,
2da02997 1360 },
1da177e4 1361 {
1da177e4 1362 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1363 .data = &dirty_writeback_interval,
1364 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1365 .mode = 0644,
6d456111 1366 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1367 },
1368 {
1da177e4 1369 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1370 .data = &dirty_expire_interval,
1371 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1372 .mode = 0644,
cb16e95f
PH		 1373 .proc_handler = proc_dointvec_minmax,
1374 .extra1 = &zero,
1da177e4 1375 },
1efff914
TT		 1376 {
1377 .procname = "dirtytime_expire_seconds",
1378 .data = &dirtytime_expire_interval,
2d87b309 1379 .maxlen = sizeof(dirtytime_expire_interval),
1efff914
TT		 1380 .mode = 0644,
1381 .proc_handler = dirtytime_interval_handler,
1382 .extra1 = &zero,
1383 },
1da177e4 1384 {
1da177e4
LT		 1385 .procname = "swappiness",
1386 .data = &vm_swappiness,
1387 .maxlen = sizeof(vm_swappiness),
1388 .mode = 0644,
6d456111 1389 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1390 .extra1 = &zero,
1391 .extra2 = &one_hundred,
1392 },
1393#ifdef CONFIG_HUGETLB_PAGE
06808b08 1394 {
1da177e4 1395 .procname = "nr_hugepages",
e5ff2159 1396 .data = NULL,
1da177e4
LT		 1397 .maxlen = sizeof(unsigned long),
1398 .mode = 0644,
6d456111 1399 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1400 },
1401#ifdef CONFIG_NUMA
1402 {
1403 .procname = "nr_hugepages_mempolicy",
1404 .data = NULL,
1405 .maxlen = sizeof(unsigned long),
1406 .mode = 0644,
1407 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08 1408 },
4518085e
KW		 1409 {
1410 .procname = "numa_stat",
1411 .data = &sysctl_vm_numa_stat,
1412 .maxlen = sizeof(int),
1413 .mode = 0644,
1414 .proc_handler = sysctl_vm_numa_stat_handler,
1415 .extra1 = &zero,
1416 .extra2 = &one,
1417 },
06808b08 1418#endif
1da177e4 1419 {
1da177e4
LT		 1420 .procname = "hugetlb_shm_group",
1421 .data = &sysctl_hugetlb_shm_group,
1422 .maxlen = sizeof(gid_t),
1423 .mode = 0644,
6d456111 1424 .proc_handler = proc_dointvec,
1da177e4 1425 },
d1c3fb1f 1426 {
d1c3fb1f 1427 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1428 .data = NULL,
1429 .maxlen = sizeof(unsigned long),
d1c3fb1f 1430 .mode = 0644,
6d456111 1431 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1432 },
1da177e4
LT		 1433#endif
1434 {
1da177e4
LT		 1435 .procname = "lowmem_reserve_ratio",
1436 .data = &sysctl_lowmem_reserve_ratio,
1437 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1438 .mode = 0644,
6d456111 1439 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1440 },
9d0243bc 1441 {
9d0243bc
AM		 1442 .procname = "drop_caches",
1443 .data = &sysctl_drop_caches,
1444 .maxlen = sizeof(int),
1445 .mode = 0644,
1446 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1447 .extra1 = &one,
5509a5d2 1448 .extra2 = &four,
9d0243bc 1449 },
76ab0f53
MG		 1450#ifdef CONFIG_COMPACTION
1451 {
1452 .procname = "compact_memory",
1453 .data = &sysctl_compact_memory,
1454 .maxlen = sizeof(int),
1455 .mode = 0200,
1456 .proc_handler = sysctl_compaction_handler,
1457 },
5e771905
MG		 1458 {
1459 .procname = "extfrag_threshold",
1460 .data = &sysctl_extfrag_threshold,
1461 .maxlen = sizeof(int),
1462 .mode = 0644,
1463 .proc_handler = sysctl_extfrag_handler,
1464 .extra1 = &min_extfrag_threshold,
1465 .extra2 = &max_extfrag_threshold,
1466 },
5bbe3547
EM		 1467 {
1468 .procname = "compact_unevictable_allowed",
1469 .data = &sysctl_compact_unevictable_allowed,
1470 .maxlen = sizeof(int),
1471 .mode = 0644,
1472 .proc_handler = proc_dointvec,
1473 .extra1 = &zero,
1474 .extra2 = &one,
1475 },
5e771905 1476
76ab0f53 1477#endif /* CONFIG_COMPACTION */
1da177e4 1478 {
1da177e4
LT		 1479 .procname = "min_free_kbytes",
1480 .data = &min_free_kbytes,
1481 .maxlen = sizeof(min_free_kbytes),
1482 .mode = 0644,
6d456111 1483 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1484 .extra1 = &zero,
1485 },
1c30844d
MG		 1486 {
1487 .procname = "watermark_boost_factor",
1488 .data = &watermark_boost_factor,
1489 .maxlen = sizeof(watermark_boost_factor),
1490 .mode = 0644,
1491 .proc_handler = watermark_boost_factor_sysctl_handler,
1492 .extra1 = &zero,
1493 },
795ae7a0
JW		 1494 {
1495 .procname = "watermark_scale_factor",
1496 .data = &watermark_scale_factor,
1497 .maxlen = sizeof(watermark_scale_factor),
1498 .mode = 0644,
1499 .proc_handler = watermark_scale_factor_sysctl_handler,
1500 .extra1 = &one,
1501 .extra2 = &one_thousand,
1502 },
8ad4b1fb 1503 {
8ad4b1fb
RS		 1504 .procname = "percpu_pagelist_fraction",
1505 .data = &percpu_pagelist_fraction,
1506 .maxlen = sizeof(percpu_pagelist_fraction),
1507 .mode = 0644,
6d456111 1508 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1509 .extra1 = &zero,
8ad4b1fb 1510 },
1da177e4
LT		 1511#ifdef CONFIG_MMU
1512 {
1da177e4
LT		 1513 .procname = "max_map_count",
1514 .data = &sysctl_max_map_count,
1515 .maxlen = sizeof(sysctl_max_map_count),
1516 .mode = 0644,
3e26120c 1517 .proc_handler = proc_dointvec_minmax,
70da2340 1518 .extra1 = &zero,
1da177e4 1519 },
dd8632a1
PM		 1520#else
1521 {
dd8632a1
PM		 1522 .procname = "nr_trim_pages",
1523 .data = &sysctl_nr_trim_pages,
1524 .maxlen = sizeof(sysctl_nr_trim_pages),
1525 .mode = 0644,
6d456111 1526 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1527 .extra1 = &zero,
1528 },
1da177e4
LT		 1529#endif
1530 {
1da177e4
LT		 1531 .procname = "laptop_mode",
1532 .data = &laptop_mode,
1533 .maxlen = sizeof(laptop_mode),
1534 .mode = 0644,
6d456111 1535 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1536 },
1537 {
1da177e4
LT		 1538 .procname = "block_dump",
1539 .data = &block_dump,
1540 .maxlen = sizeof(block_dump),
1541 .mode = 0644,
6d456111 1542 .proc_handler = proc_dointvec,
1da177e4
LT		 1543 .extra1 = &zero,
1544 },
1545 {
1da177e4
LT		 1546 .procname = "vfs_cache_pressure",
1547 .data = &sysctl_vfs_cache_pressure,
1548 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1549 .mode = 0644,
6d456111 1550 .proc_handler = proc_dointvec,
1da177e4
LT		 1551 .extra1 = &zero,
1552 },
1553#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1554 {
1da177e4
LT		 1555 .procname = "legacy_va_layout",
1556 .data = &sysctl_legacy_va_layout,
1557 .maxlen = sizeof(sysctl_legacy_va_layout),
1558 .mode = 0644,
6d456111 1559 .proc_handler = proc_dointvec,
1da177e4
LT		 1560 .extra1 = &zero,
1561 },
1562#endif
1743660b
CL		 1563#ifdef CONFIG_NUMA
1564 {
1743660b 1565 .procname = "zone_reclaim_mode",
a5f5f91d
MG		 1566 .data = &node_reclaim_mode,
1567 .maxlen = sizeof(node_reclaim_mode),
1743660b 1568 .mode = 0644,
6d456111 1569 .proc_handler = proc_dointvec,
c84db23c 1570 .extra1 = &zero,
1743660b 1571 },
9614634f 1572 {
9614634f
CL		 1573 .procname = "min_unmapped_ratio",
1574 .data = &sysctl_min_unmapped_ratio,
1575 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1576 .mode = 0644,
6d456111 1577 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1578 .extra1 = &zero,
1579 .extra2 = &one_hundred,
1580 },
0ff38490 1581 {
0ff38490
CL		 1582 .procname = "min_slab_ratio",
1583 .data = &sysctl_min_slab_ratio,
1584 .maxlen = sizeof(sysctl_min_slab_ratio),
1585 .mode = 0644,
6d456111 1586 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1587 .extra1 = &zero,
1588 .extra2 = &one_hundred,
1589 },
e6e5494c 1590#endif
77461ab3
CL		 1591#ifdef CONFIG_SMP
1592 {
77461ab3
CL		 1593 .procname = "stat_interval",
1594 .data = &sysctl_stat_interval,
1595 .maxlen = sizeof(sysctl_stat_interval),
1596 .mode = 0644,
6d456111 1597 .proc_handler = proc_dointvec_jiffies,
77461ab3 1598 },
52b6f46b
HD		 1599 {
1600 .procname = "stat_refresh",
1601 .data = NULL,
1602 .maxlen = 0,
1603 .mode = 0600,
1604 .proc_handler = vmstat_refresh,
1605 },
77461ab3 1606#endif
6e141546 1607#ifdef CONFIG_MMU
ed032189 1608 {
ed032189 1609 .procname = "mmap_min_addr",
788084ab
EP		 1610 .data = &dac_mmap_min_addr,
1611 .maxlen = sizeof(unsigned long),
ed032189 1612 .mode = 0644,
6d456111 1613 .proc_handler = mmap_min_addr_handler,
ed032189 1614 },
6e141546 1615#endif
f0c0b2b8
KH		 1616#ifdef CONFIG_NUMA
1617 {
f0c0b2b8
KH		 1618 .procname = "numa_zonelist_order",
1619 .data = &numa_zonelist_order,
1620 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1621 .mode = 0644,
6d456111 1622 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1623 },
1624#endif
2b8232ce 1625#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1626 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1627 {
e6e5494c 1628 .procname = "vdso_enabled",
3d7ee969
AL		 1629#ifdef CONFIG_X86_32
1630 .data = &vdso32_enabled,
1631 .maxlen = sizeof(vdso32_enabled),
1632#else
e6e5494c
IM		 1633 .data = &vdso_enabled,
1634 .maxlen = sizeof(vdso_enabled),
3d7ee969 1635#endif
e6e5494c 1636 .mode = 0644,
6d456111 1637 .proc_handler = proc_dointvec,
e6e5494c
IM		 1638 .extra1 = &zero,
1639 },
1da177e4 1640#endif
195cf453
BG		 1641#ifdef CONFIG_HIGHMEM
1642 {
195cf453
BG		 1643 .procname = "highmem_is_dirtyable",
1644 .data = &vm_highmem_is_dirtyable,
1645 .maxlen = sizeof(vm_highmem_is_dirtyable),
1646 .mode = 0644,
6d456111 1647 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1648 .extra1 = &zero,
1649 .extra2 = &one,
1650 },
1651#endif
6a46079c
AK		 1652#ifdef CONFIG_MEMORY_FAILURE
1653 {
6a46079c
AK		 1654 .procname = "memory_failure_early_kill",
1655 .data = &sysctl_memory_failure_early_kill,
1656 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1657 .mode = 0644,
6d456111 1658 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1659 .extra1 = &zero,
1660 .extra2 = &one,
1661 },
1662 {
6a46079c
AK		 1663 .procname = "memory_failure_recovery",
1664 .data = &sysctl_memory_failure_recovery,
1665 .maxlen = sizeof(sysctl_memory_failure_recovery),
1666 .mode = 0644,
6d456111 1667 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1668 .extra1 = &zero,
1669 .extra2 = &one,
1670 },
1671#endif
c9b1d098
AS		 1672 {
1673 .procname = "user_reserve_kbytes",
1674 .data = &sysctl_user_reserve_kbytes,
1675 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1676 .mode = 0644,
1677 .proc_handler = proc_doulongvec_minmax,
1678 },
4eeab4f5
AS		 1679 {
1680 .procname = "admin_reserve_kbytes",
1681 .data = &sysctl_admin_reserve_kbytes,
1682 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1683 .mode = 0644,
1684 .proc_handler = proc_doulongvec_minmax,
1685 },
d07e2259
DC		 1686#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1687 {
1688 .procname = "mmap_rnd_bits",
1689 .data = &mmap_rnd_bits,
1690 .maxlen = sizeof(mmap_rnd_bits),
1691 .mode = 0600,
1692 .proc_handler = proc_dointvec_minmax,
1693 .extra1 = (void *)&mmap_rnd_bits_min,
1694 .extra2 = (void *)&mmap_rnd_bits_max,
1695 },
1696#endif
1697#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1698 {
1699 .procname = "mmap_rnd_compat_bits",
1700 .data = &mmap_rnd_compat_bits,
1701 .maxlen = sizeof(mmap_rnd_compat_bits),
1702 .mode = 0600,
1703 .proc_handler = proc_dointvec_minmax,
1704 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1705 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1706 },
1707#endif
6fce56ec 1708 { }
1da177e4
LT		 1709};
1710
d8217f07 1711static struct ctl_table fs_table[] = {
1da177e4 1712 {
1da177e4
LT		 1713 .procname = "inode-nr",
1714 .data = &inodes_stat,
3942c07c 1715 .maxlen = 2*sizeof(long),
1da177e4 1716 .mode = 0444,
cffbc8aa 1717 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1718 },
1719 {
1da177e4
LT		 1720 .procname = "inode-state",
1721 .data = &inodes_stat,
3942c07c 1722 .maxlen = 7*sizeof(long),
1da177e4 1723 .mode = 0444,
cffbc8aa 1724 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1725 },
1726 {
1da177e4
LT		 1727 .procname = "file-nr",
1728 .data = &files_stat,
518de9b3 1729 .maxlen = sizeof(files_stat),
1da177e4 1730 .mode = 0444,
6d456111 1731 .proc_handler = proc_nr_files,
1da177e4
LT		 1732 },
1733 {
1da177e4
LT		 1734 .procname = "file-max",
1735 .data = &files_stat.max_files,
518de9b3 1736 .maxlen = sizeof(files_stat.max_files),
1da177e4 1737 .mode = 0644,
518de9b3 1738 .proc_handler = proc_doulongvec_minmax,
1da177e4 1739 },
9cfe015a 1740 {
9cfe015a
ED		 1741 .procname = "nr_open",
1742 .data = &sysctl_nr_open,
9b80a184 1743 .maxlen = sizeof(unsigned int),
9cfe015a 1744 .mode = 0644,
6d456111 1745 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1746 .extra1 = &sysctl_nr_open_min,
1747 .extra2 = &sysctl_nr_open_max,
9cfe015a 1748 },
1da177e4 1749 {
1da177e4
LT		 1750 .procname = "dentry-state",
1751 .data = &dentry_stat,
3942c07c 1752 .maxlen = 6*sizeof(long),
1da177e4 1753 .mode = 0444,
312d3ca8 1754 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1755 },
1756 {
1da177e4
LT		 1757 .procname = "overflowuid",
1758 .data = &fs_overflowuid,
1759 .maxlen = sizeof(int),
1760 .mode = 0644,
6d456111 1761 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1762 .extra1 = &minolduid,
1763 .extra2 = &maxolduid,
1764 },
1765 {
1da177e4
LT		 1766 .procname = "overflowgid",
1767 .data = &fs_overflowgid,
1768 .maxlen = sizeof(int),
1769 .mode = 0644,
6d456111 1770 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1771 .extra1 = &minolduid,
1772 .extra2 = &maxolduid,
1773 },
bfcd17a6 1774#ifdef CONFIG_FILE_LOCKING
1da177e4 1775 {
1da177e4
LT		 1776 .procname = "leases-enable",
1777 .data = &leases_enable,
1778 .maxlen = sizeof(int),
1779 .mode = 0644,
6d456111 1780 .proc_handler = proc_dointvec,
1da177e4 1781 },
bfcd17a6 1782#endif
1da177e4
LT		 1783#ifdef CONFIG_DNOTIFY
1784 {
1da177e4
LT		 1785 .procname = "dir-notify-enable",
1786 .data = &dir_notify_enable,
1787 .maxlen = sizeof(int),
1788 .mode = 0644,
6d456111 1789 .proc_handler = proc_dointvec,
1da177e4
LT		 1790 },
1791#endif
1792#ifdef CONFIG_MMU
bfcd17a6 1793#ifdef CONFIG_FILE_LOCKING
1da177e4 1794 {
1da177e4
LT		 1795 .procname = "lease-break-time",
1796 .data = &lease_break_time,
1797 .maxlen = sizeof(int),
1798 .mode = 0644,
6d456111 1799 .proc_handler = proc_dointvec,
1da177e4 1800 },
bfcd17a6 1801#endif
ebf3f09c 1802#ifdef CONFIG_AIO
1da177e4 1803 {
1da177e4
LT		 1804 .procname = "aio-nr",
1805 .data = &aio_nr,
1806 .maxlen = sizeof(aio_nr),
1807 .mode = 0444,
6d456111 1808 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1809 },
1810 {
1da177e4
LT		 1811 .procname = "aio-max-nr",
1812 .data = &aio_max_nr,
1813 .maxlen = sizeof(aio_max_nr),
1814 .mode = 0644,
6d456111 1815 .proc_handler = proc_doulongvec_minmax,
1da177e4 1816 },
ebf3f09c 1817#endif /* CONFIG_AIO */
2d9048e2 1818#ifdef CONFIG_INOTIFY_USER
0399cb08 1819 {
0399cb08
RL		 1820 .procname = "inotify",
1821 .mode = 0555,
1822 .child = inotify_table,
1823 },
1824#endif
7ef9964e
DL		 1825#ifdef CONFIG_EPOLL
1826 {
1827 .procname = "epoll",
1828 .mode = 0555,
1829 .child = epoll_table,
1830 },
1831#endif
1da177e4 1832#endif
800179c9
KC		 1833 {
1834 .procname = "protected_symlinks",
1835 .data = &sysctl_protected_symlinks,
1836 .maxlen = sizeof(int),
1837 .mode = 0600,
1838 .proc_handler = proc_dointvec_minmax,
1839 .extra1 = &zero,
1840 .extra2 = &one,
1841 },
1842 {
1843 .procname = "protected_hardlinks",
1844 .data = &sysctl_protected_hardlinks,
1845 .maxlen = sizeof(int),
1846 .mode = 0600,
1847 .proc_handler = proc_dointvec_minmax,
1848 .extra1 = &zero,
1849 .extra2 = &one,
1850 },
30aba665
SM		 1851 {
1852 .procname = "protected_fifos",
1853 .data = &sysctl_protected_fifos,
1854 .maxlen = sizeof(int),
1855 .mode = 0600,
1856 .proc_handler = proc_dointvec_minmax,
1857 .extra1 = &zero,
1858 .extra2 = &two,
1859 },
1860 {
1861 .procname = "protected_regular",
1862 .data = &sysctl_protected_regular,
1863 .maxlen = sizeof(int),
1864 .mode = 0600,
1865 .proc_handler = proc_dointvec_minmax,
1866 .extra1 = &zero,
1867 .extra2 = &two,
1868 },
d6e71144 1869 {
d6e71144
AC		 1870 .procname = "suid_dumpable",
1871 .data = &suid_dumpable,
1872 .maxlen = sizeof(int),
1873 .mode = 0644,
54b50199 1874 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1875 .extra1 = &zero,
1876 .extra2 = &two,
d6e71144 1877 },
2abc26fc
EB		 1878#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1879 {
2abc26fc
EB		 1880 .procname = "binfmt_misc",
1881 .mode = 0555,
f9bd6733 1882 .child = sysctl_mount_point,
2abc26fc
EB		 1883 },
1884#endif
b492e95b 1885 {
ff9da691
JA		 1886 .procname = "pipe-max-size",
1887 .data = &pipe_max_size,
98159d97 1888 .maxlen = sizeof(pipe_max_size),
b492e95b 1889 .mode = 0644,
319e0a21 1890 .proc_handler = proc_dopipe_max_size,
b492e95b 1891 },
759c0114
WT		 1892 {
1893 .procname = "pipe-user-pages-hard",
1894 .data = &pipe_user_pages_hard,
1895 .maxlen = sizeof(pipe_user_pages_hard),
1896 .mode = 0644,
1897 .proc_handler = proc_doulongvec_minmax,
1898 },
1899 {
1900 .procname = "pipe-user-pages-soft",
1901 .data = &pipe_user_pages_soft,
1902 .maxlen = sizeof(pipe_user_pages_soft),
1903 .mode = 0644,
1904 .proc_handler = proc_doulongvec_minmax,
1905 },
d2921684
EB		 1906 {
1907 .procname = "mount-max",
1908 .data = &sysctl_mount_max,
1909 .maxlen = sizeof(unsigned int),
1910 .mode = 0644,
1911 .proc_handler = proc_dointvec_minmax,
1912 .extra1 = &one,
1913 },
6fce56ec 1914 { }
1da177e4
LT		 1915};
1916
d8217f07 1917static struct ctl_table debug_table[] = {
7ac57a89 1918#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1919 {
abd4f750
MAS		 1920 .procname = "exception-trace",
1921 .data = &show_unhandled_signals,
1922 .maxlen = sizeof(int),
1923 .mode = 0644,
1924 .proc_handler = proc_dointvec
1925 },
b2be84df
MH		 1926#endif
1927#if defined(CONFIG_OPTPROBES)
1928 {
1929 .procname = "kprobes-optimization",
1930 .data = &sysctl_kprobes_optimization,
1931 .maxlen = sizeof(int),
1932 .mode = 0644,
1933 .proc_handler = proc_kprobes_optimization_handler,
1934 .extra1 = &zero,
1935 .extra2 = &one,
1936 },
abd4f750 1937#endif
6fce56ec 1938 { }
1da177e4
LT		 1939};
1940
d8217f07 1941static struct ctl_table dev_table[] = {
6fce56ec 1942 { }
0eeca283 1943};
1da177e4 1944
de4e83bd 1945int __init sysctl_init(void)
d912b0cc 1946{
fd4b616b
SR		 1947 struct ctl_table_header *hdr;
1948
1949 hdr = register_sysctl_table(sysctl_base_table);
1950 kmemleak_not_leak(hdr);
d912b0cc
EB		 1951 return 0;
1952}
1953
b89a8171
EB		 1954#endif /* CONFIG_SYSCTL */
1955
1da177e4
LT		 1956/*
1957 * /proc/sys support
1958 */
1959
b89a8171 1960#ifdef CONFIG_PROC_SYSCTL
1da177e4 1961
f8808300
KC		 1962static int _proc_do_string(char *data, int maxlen, int write,
1963 char __user *buffer,
b1ba4ddd 1964 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1965{
1966 size_t len;
1967 char __user *p;
1968 char c;
8d060877
ON		 1969
1970 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1971 *lenp = 0;
1972 return 0;
1973 }
8d060877 1974
1da177e4 1975 if (write) {
f4aacea2
KC		 1976 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1977 /* Only continue writes not past the end of buffer. */
1978 len = strlen(data);
1979 if (len > maxlen - 1)
1980 len = maxlen - 1;
1981
1982 if (*ppos > len)
1983 return 0;
1984 len = *ppos;
1985 } else {
1986 /* Start writing from beginning of buffer. */
1987 len = 0;
1988 }
1989
2ca9bb45 1990 *ppos += *lenp;
1da177e4 1991 p = buffer;
2ca9bb45 1992 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1993 if (get_user(c, p++))
1994 return -EFAULT;
1995 if (c == 0 || c == '\n')
1996 break;
2ca9bb45 1997 data[len++] = c;
1da177e4 1998 }
f8808300 1999 data[len] = 0;
1da177e4 2000 } else {
f5dd3d6f
SV		 2001 len = strlen(data);
2002 if (len > maxlen)
2003 len = maxlen;
8d060877
ON		 2004
2005 if (*ppos > len) {
2006 *lenp = 0;
2007 return 0;
2008 }
2009
2010 data += *ppos;
2011 len -= *ppos;
2012
1da177e4
LT		 2013 if (len > *lenp)
2014 len = *lenp;
2015 if (len)
f8808300 2016 if (copy_to_user(buffer, data, len))
1da177e4
LT		 2017 return -EFAULT;
2018 if (len < *lenp) {
f8808300 2019 if (put_user('\n', buffer + len))
1da177e4
LT		 2020 return -EFAULT;
2021 len++;
2022 }
2023 *lenp = len;
2024 *ppos += len;
2025 }
2026 return 0;
2027}
2028
f4aacea2
KC		 2029static void warn_sysctl_write(struct ctl_table *table)
2030{
2031 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2032 "This will not be supported in the future. To silence this\n"
2033 "warning, set kernel.sysctl_writes_strict = -1\n",
2034 current->comm, table->procname);
2035}
2036
d383d484 2037/**
5f733e8a 2038 * proc_first_pos_non_zero_ignore - check if first position is allowed
d383d484
LR		 2039 * @ppos: file position
2040 * @table: the sysctl table
2041 *
2042 * Returns true if the first position is non-zero and the sysctl_writes_strict
2043 * mode indicates this is not allowed for numeric input types. String proc
5f733e8a 2044 * handlers can ignore the return value.
d383d484
LR		 2045 */
2046static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2047 struct ctl_table *table)
2048{
2049 if (!*ppos)
2050 return false;
2051
2052 switch (sysctl_writes_strict) {
2053 case SYSCTL_WRITES_STRICT:
2054 return true;
2055 case SYSCTL_WRITES_WARN:
2056 warn_sysctl_write(table);
2057 return false;
2058 default:
2059 return false;
2060 }
2061}
2062
f5dd3d6f
SV		 2063/**
2064 * proc_dostring - read a string sysctl
2065 * @table: the sysctl table
2066 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 2067 * @buffer: the user buffer
2068 * @lenp: the size of the user buffer
2069 * @ppos: file position
2070 *
2071 * Reads/writes a string from/to the user buffer. If the kernel
2072 * buffer provided is not large enough to hold the string, the
2073 * string is truncated. The copied string is %NULL-terminated.
2074 * If the string is being read by the user process, it is copied
2075 * and a newline '\n' is added. It is truncated if the buffer is
2076 * not large enough.
2077 *
2078 * Returns 0 on success.
2079 */
8d65af78 2080int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 2081 void __user *buffer, size_t *lenp, loff_t *ppos)
2082{
d383d484
LR		 2083 if (write)
2084 proc_first_pos_non_zero_ignore(ppos, table);
f4aacea2 2085
f8808300
KC		 2086 return _proc_do_string((char *)(table->data), table->maxlen, write,
2087 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 2088}
2089
00b7c339
AW		 2090static size_t proc_skip_spaces(char **buf)
2091{
2092 size_t ret;
2093 char *tmp = skip_spaces(*buf);
2094 ret = tmp - *buf;
2095 *buf = tmp;
2096 return ret;
2097}
2098
9f977fb7
OP		 2099static void proc_skip_char(char **buf, size_t *size, const char v)
2100{
2101 while (*size) {
2102 if (**buf != v)
2103 break;
2104 (*size)--;
2105 (*buf)++;
2106 }
2107}
2108
00b7c339
AW		 2109#define TMPBUFLEN 22
2110/**
0fc377bd 2111 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2112 *
0fc377bd
RD		 2113 * @buf: a kernel buffer
2114 * @size: size of the kernel buffer
2115 * @val: this is where the number will be stored
2116 * @neg: set to %TRUE if number is negative
2117 * @perm_tr: a vector which contains the allowed trailers
2118 * @perm_tr_len: size of the perm_tr vector
2119 * @tr: pointer to store the trailer character
00b7c339 2120 *
0fc377bd
RD		 2121 * In case of success %0 is returned and @buf and @size are updated with
2122 * the amount of bytes read. If @tr is non-NULL and a trailing
2123 * character exists (size is non-zero after returning from this
2124 * function), @tr is updated with the trailing character.
00b7c339
AW		 2125 */
2126static int proc_get_long(char **buf, size_t *size,
2127 unsigned long *val, bool *neg,
2128 const char *perm_tr, unsigned perm_tr_len, char *tr)
2129{
2130 int len;
2131 char *p, tmp[TMPBUFLEN];
2132
2133 if (!*size)
2134 return -EINVAL;
2135
2136 len = *size;
2137 if (len > TMPBUFLEN - 1)
2138 len = TMPBUFLEN - 1;
2139
2140 memcpy(tmp, *buf, len);
2141
2142 tmp[len] = 0;
2143 p = tmp;
2144 if (*p == '-' && *size > 1) {
2145 *neg = true;
2146 p++;
2147 } else
2148 *neg = false;
2149 if (!isdigit(*p))
2150 return -EINVAL;
2151
2152 *val = simple_strtoul(p, &p, 0);
2153
2154 len = p - tmp;
2155
2156 /* We don't know if the next char is whitespace thus we may accept
2157 * invalid integers (e.g. 1234...a) or two integers instead of one
2158 * (e.g. 123...1). So lets not allow such large numbers. */
2159 if (len == TMPBUFLEN - 1)
2160 return -EINVAL;
2161
2162 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2163 return -EINVAL;
1da177e4 2164
00b7c339
AW		 2165 if (tr && (len < *size))
2166 *tr = *p;
2167
2168 *buf += len;
2169 *size -= len;
2170
2171 return 0;
2172}
2173
2174/**
0fc377bd 2175 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2176 *
0fc377bd
RD		 2177 * @buf: the user buffer
2178 * @size: the size of the user buffer
2179 * @val: the integer to be converted
2180 * @neg: sign of the number, %TRUE for negative
00b7c339 2181 *
0fc377bd
RD		 2182 * In case of success %0 is returned and @buf and @size are updated with
2183 * the amount of bytes written.
00b7c339
AW		 2184 */
2185static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2186 bool neg)
2187{
2188 int len;
2189 char tmp[TMPBUFLEN], *p = tmp;
2190
2191 sprintf(p, "%s%lu", neg ? "-" : "", val);
2192 len = strlen(tmp);
2193 if (len > *size)
2194 len = *size;
2195 if (copy_to_user(*buf, tmp, len))
2196 return -EFAULT;
2197 *size -= len;
2198 *buf += len;
2199 return 0;
2200}
2201#undef TMPBUFLEN
2202
2203static int proc_put_char(void __user **buf, size_t *size, char c)
2204{
2205 if (*size) {
2206 char __user **buffer = (char __user **)buf;
2207 if (put_user(c, *buffer))
2208 return -EFAULT;
2209 (*size)--, (*buffer)++;
2210 *buf = *buffer;
2211 }
2212 return 0;
2213}
1da177e4 2214
00b7c339 2215static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2216 int *valp,
2217 int write, void *data)
2218{
2219 if (write) {
230633d1
HS		 2220 if (*negp) {
2221 if (*lvalp > (unsigned long) INT_MAX + 1)
2222 return -EINVAL;
2223 *valp = -*lvalp;
2224 } else {
2225 if (*lvalp > (unsigned long) INT_MAX)
2226 return -EINVAL;
2227 *valp = *lvalp;
2228 }
1da177e4
LT		 2229 } else {
2230 int val = *valp;
2231 if (val < 0) {
00b7c339 2232 *negp = true;
9a5bc726 2233 *lvalp = -(unsigned long)val;
1da177e4 2234 } else {
00b7c339 2235 *negp = false;
1da177e4
LT		 2236 *lvalp = (unsigned long)val;
2237 }
2238 }
2239 return 0;
2240}
2241
4f2fec00
LR		 2242static int do_proc_douintvec_conv(unsigned long *lvalp,
2243 unsigned int *valp,
2244 int write, void *data)
e7d316a0
SAK		 2245{
2246 if (write) {
425fffd8
LZ		 2247 if (*lvalp > UINT_MAX)
2248 return -EINVAL;
e7d316a0
SAK		 2249 *valp = *lvalp;
2250 } else {
2251 unsigned int val = *valp;
2252 *lvalp = (unsigned long)val;
2253 }
2254 return 0;
2255}
2256
00b7c339
AW		 2257static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2258
d8217f07 2259static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2260 int write, void __user *buffer,
fcfbd547 2261 size_t *lenp, loff_t *ppos,
00b7c339 2262 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2263 int write, void *data),
2264 void *data)
2265{
00b7c339 2266 int *i, vleft, first = 1, err = 0;
00b7c339 2267 size_t left;
70f6cbb6 2268 char *kbuf = NULL, *p;
1da177e4 2269
00b7c339 2270 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2271 *lenp = 0;
2272 return 0;
2273 }
2274
fcfbd547 2275 i = (int *) tbl_data;
1da177e4
LT		 2276 vleft = table->maxlen / sizeof(*i);
2277 left = *lenp;
2278
2279 if (!conv)
2280 conv = do_proc_dointvec_conv;
2281
00b7c339 2282 if (write) {
d383d484
LR		 2283 if (proc_first_pos_non_zero_ignore(ppos, table))
2284 goto out;
f4aacea2 2285
00b7c339
AW		 2286 if (left > PAGE_SIZE - 1)
2287 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2288 p = kbuf = memdup_user_nul(buffer, left);
2289 if (IS_ERR(kbuf))
2290 return PTR_ERR(kbuf);
00b7c339
AW		 2291 }
2292
1da177e4 2293 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2294 unsigned long lval;
2295 bool neg;
1da177e4 2296
00b7c339 2297 if (write) {
70f6cbb6 2298 left -= proc_skip_spaces(&p);
1da177e4 2299
563b0467
O		 2300 if (!left)
2301 break;
70f6cbb6 2302 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2303 proc_wspace_sep,
2304 sizeof(proc_wspace_sep), NULL);
2305 if (err)
1da177e4 2306 break;
00b7c339
AW		 2307 if (conv(&neg, &lval, i, 1, data)) {
2308 err = -EINVAL;
1da177e4 2309 break;
00b7c339 2310 }
1da177e4 2311 } else {
00b7c339
AW		 2312 if (conv(&neg, &lval, i, 0, data)) {
2313 err = -EINVAL;
2314 break;
2315 }
1da177e4 2316 if (!first)
00b7c339
AW		 2317 err = proc_put_char(&buffer, &left, '\t');
2318 if (err)
2319 break;
2320 err = proc_put_long(&buffer, &left, lval, neg);
2321 if (err)
1da177e4 2322 break;
1da177e4
LT		 2323 }
2324 }
2325
00b7c339
AW		 2326 if (!write && !first && left && !err)
2327 err = proc_put_char(&buffer, &left, '\n');
563b0467 2328 if (write && !err && left)
70f6cbb6 2329 left -= proc_skip_spaces(&p);
1da177e4 2330 if (write) {
70f6cbb6 2331 kfree(kbuf);
00b7c339
AW		 2332 if (first)
2333 return err ? : -EINVAL;
1da177e4 2334 }
1da177e4 2335 *lenp -= left;
f4aacea2 2336out:
1da177e4 2337 *ppos += *lenp;
00b7c339 2338 return err;
1da177e4
LT		 2339}
2340
8d65af78 2341static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2342 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2343 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2344 int write, void *data),
2345 void *data)
2346{
8d65af78 2347 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2348 buffer, lenp, ppos, conv, data);
2349}
2350
4f2fec00
LR		 2351static int do_proc_douintvec_w(unsigned int *tbl_data,
2352 struct ctl_table *table,
2353 void __user *buffer,
2354 size_t *lenp, loff_t *ppos,
2355 int (*conv)(unsigned long *lvalp,
2356 unsigned int *valp,
2357 int write, void *data),
2358 void *data)
2359{
2360 unsigned long lval;
2361 int err = 0;
2362 size_t left;
2363 bool neg;
2364 char *kbuf = NULL, *p;
2365
2366 left = *lenp;
2367
2368 if (proc_first_pos_non_zero_ignore(ppos, table))
2369 goto bail_early;
2370
2371 if (left > PAGE_SIZE - 1)
2372 left = PAGE_SIZE - 1;
2373
2374 p = kbuf = memdup_user_nul(buffer, left);
2375 if (IS_ERR(kbuf))
2376 return -EINVAL;
2377
2378 left -= proc_skip_spaces(&p);
2379 if (!left) {
2380 err = -EINVAL;
2381 goto out_free;
2382 }
2383
2384 err = proc_get_long(&p, &left, &lval, &neg,
2385 proc_wspace_sep,
2386 sizeof(proc_wspace_sep), NULL);
2387 if (err || neg) {
2388 err = -EINVAL;
2389 goto out_free;
2390 }
2391
2392 if (conv(&lval, tbl_data, 1, data)) {
2393 err = -EINVAL;
2394 goto out_free;
2395 }
2396
2397 if (!err && left)
2398 left -= proc_skip_spaces(&p);
2399
2400out_free:
2401 kfree(kbuf);
2402 if (err)
2403 return -EINVAL;
2404
2405 return 0;
2406
2407 /* This is in keeping with old __do_proc_dointvec() */
2408bail_early:
2409 *ppos += *lenp;
2410 return err;
2411}
2412
2413static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2414 size_t *lenp, loff_t *ppos,
2415 int (*conv)(unsigned long *lvalp,
2416 unsigned int *valp,
2417 int write, void *data),
2418 void *data)
2419{
2420 unsigned long lval;
2421 int err = 0;
2422 size_t left;
2423
2424 left = *lenp;
2425
2426 if (conv(&lval, tbl_data, 0, data)) {
2427 err = -EINVAL;
2428 goto out;
2429 }
2430
2431 err = proc_put_long(&buffer, &left, lval, false);
2432 if (err || !left)
2433 goto out;
2434
2435 err = proc_put_char(&buffer, &left, '\n');
2436
2437out:
2438 *lenp -= left;
2439 *ppos += *lenp;
2440
2441 return err;
2442}
2443
2444static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2445 int write, void __user *buffer,
2446 size_t *lenp, loff_t *ppos,
2447 int (*conv)(unsigned long *lvalp,
2448 unsigned int *valp,
2449 int write, void *data),
2450 void *data)
2451{
2452 unsigned int *i, vleft;
2453
2454 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2455 *lenp = 0;
2456 return 0;
2457 }
2458
2459 i = (unsigned int *) tbl_data;
2460 vleft = table->maxlen / sizeof(*i);
2461
2462 /*
2463 * Arrays are not supported, keep this simple. *Do not* add
2464 * support for them.
2465 */
2466 if (vleft != 1) {
2467 *lenp = 0;
2468 return -EINVAL;
2469 }
2470
2471 if (!conv)
2472 conv = do_proc_douintvec_conv;
2473
2474 if (write)
2475 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2476 conv, data);
2477 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2478}
2479
2480static int do_proc_douintvec(struct ctl_table *table, int write,
2481 void __user *buffer, size_t *lenp, loff_t *ppos,
2482 int (*conv)(unsigned long *lvalp,
2483 unsigned int *valp,
2484 int write, void *data),
2485 void *data)
2486{
2487 return __do_proc_douintvec(table->data, table, write,
2488 buffer, lenp, ppos, conv, data);
2489}
2490
1da177e4
LT		 2491/**
2492 * proc_dointvec - read a vector of integers
2493 * @table: the sysctl table
2494 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2495 * @buffer: the user buffer
2496 * @lenp: the size of the user buffer
2497 * @ppos: file position
2498 *
2499 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2500 * values from/to the user buffer, treated as an ASCII string.
2501 *
2502 * Returns 0 on success.
2503 */
8d65af78 2504int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2505 void __user *buffer, size_t *lenp, loff_t *ppos)
2506{
e7d316a0
SAK		 2507 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2508}
2509
2510/**
2511 * proc_douintvec - read a vector of unsigned integers
2512 * @table: the sysctl table
2513 * @write: %TRUE if this is a write to the sysctl file
2514 * @buffer: the user buffer
2515 * @lenp: the size of the user buffer
2516 * @ppos: file position
2517 *
2518 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2519 * values from/to the user buffer, treated as an ASCII string.
2520 *
2521 * Returns 0 on success.
2522 */
2523int proc_douintvec(struct ctl_table *table, int write,
2524 void __user *buffer, size_t *lenp, loff_t *ppos)
2525{
4f2fec00
LR		 2526 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2527 do_proc_douintvec_conv, NULL);
1da177e4
LT		 2528}
2529
34f5a398 2530/*
25ddbb18
AK		 2531 * Taint values can only be increased
2532 * This means we can safely use a temporary.
34f5a398 2533 */
8d65af78 2534static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2535 void __user *buffer, size_t *lenp, loff_t *ppos)
2536{
25ddbb18
AK		 2537 struct ctl_table t;
2538 unsigned long tmptaint = get_taint();
2539 int err;
34f5a398 2540
91fcd412 2541 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2542 return -EPERM;
2543
25ddbb18
AK		 2544 t = *table;
2545 t.data = &tmptaint;
8d65af78 2546 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2547 if (err < 0)
2548 return err;
2549
2550 if (write) {
2551 /*
2552 * Poor man's atomic or. Not worth adding a primitive
2553 * to everyone's atomic.h for this
2554 */
2555 int i;
2556 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2557 if ((tmptaint >> i) & 1)
373d4d09 2558 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2559 }
2560 }
2561
2562 return err;
34f5a398
TT		 2563}
2564
bfdc0b49 2565#ifdef CONFIG_PRINTK
620f6e8e 2566static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2567 void __user *buffer, size_t *lenp, loff_t *ppos)
2568{
2569 if (write && !capable(CAP_SYS_ADMIN))
2570 return -EPERM;
2571
2572 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2573}
2574#endif
2575
24704f36
WL		 2576/**
2577 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2578 * @min: pointer to minimum allowable value
2579 * @max: pointer to maximum allowable value
2580 *
2581 * The do_proc_dointvec_minmax_conv_param structure provides the
2582 * minimum and maximum values for doing range checking for those sysctl
2583 * parameters that use the proc_dointvec_minmax() handler.
2584 */
1da177e4
LT		 2585struct do_proc_dointvec_minmax_conv_param {
2586 int *min;
2587 int *max;
2588};
2589
00b7c339
AW		 2590static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2591 int *valp,
1da177e4
LT		 2592 int write, void *data)
2593{
2594 struct do_proc_dointvec_minmax_conv_param *param = data;
2595 if (write) {
2596 int val = *negp ? -*lvalp : *lvalp;
2597 if ((param->min && *param->min > val) ||
2598 (param->max && *param->max < val))
2599 return -EINVAL;
2600 *valp = val;
2601 } else {
2602 int val = *valp;
2603 if (val < 0) {
00b7c339 2604 *negp = true;
9a5bc726 2605 *lvalp = -(unsigned long)val;
1da177e4 2606 } else {
00b7c339 2607 *negp = false;
1da177e4
LT		 2608 *lvalp = (unsigned long)val;
2609 }
2610 }
2611 return 0;
2612}
2613
2614/**
2615 * proc_dointvec_minmax - read a vector of integers with min/max values
2616 * @table: the sysctl table
2617 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2618 * @buffer: the user buffer
2619 * @lenp: the size of the user buffer
2620 * @ppos: file position
2621 *
2622 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2623 * values from/to the user buffer, treated as an ASCII string.
2624 *
2625 * This routine will ensure the values are within the range specified by
2626 * table->extra1 (min) and table->extra2 (max).
2627 *
24704f36 2628 * Returns 0 on success or -EINVAL on write when the range check fails.
1da177e4 2629 */
8d65af78 2630int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2631 void __user *buffer, size_t *lenp, loff_t *ppos)
2632{
2633 struct do_proc_dointvec_minmax_conv_param param = {
2634 .min = (int *) table->extra1,
2635 .max = (int *) table->extra2,
2636 };
8d65af78 2637 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2638 do_proc_dointvec_minmax_conv, &param);
2639}
2640
24704f36
WL		 2641/**
2642 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2643 * @min: pointer to minimum allowable value
2644 * @max: pointer to maximum allowable value
2645 *
2646 * The do_proc_douintvec_minmax_conv_param structure provides the
2647 * minimum and maximum values for doing range checking for those sysctl
2648 * parameters that use the proc_douintvec_minmax() handler.
2649 */
61d9b56a
LR		 2650struct do_proc_douintvec_minmax_conv_param {
2651 unsigned int *min;
2652 unsigned int *max;
2653};
2654
2655static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2656 unsigned int *valp,
2657 int write, void *data)
2658{
2659 struct do_proc_douintvec_minmax_conv_param *param = data;
2660
2661 if (write) {
2662 unsigned int val = *lvalp;
2663
fb910c42
JL		 2664 if (*lvalp > UINT_MAX)
2665 return -EINVAL;
2666
61d9b56a
LR		 2667 if ((param->min && *param->min > val) ||
2668 (param->max && *param->max < val))
2669 return -ERANGE;
2670
61d9b56a
LR		 2671 *valp = val;
2672 } else {
2673 unsigned int val = *valp;
2674 *lvalp = (unsigned long) val;
2675 }
2676
2677 return 0;
2678}
2679
2680/**
2681 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2682 * @table: the sysctl table
2683 * @write: %TRUE if this is a write to the sysctl file
2684 * @buffer: the user buffer
2685 * @lenp: the size of the user buffer
2686 * @ppos: file position
2687 *
2688 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2689 * values from/to the user buffer, treated as an ASCII string. Negative
2690 * strings are not allowed.
2691 *
2692 * This routine will ensure the values are within the range specified by
2693 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2694 * check for UINT_MAX to avoid having to support wrap around uses from
2695 * userspace.
2696 *
24704f36 2697 * Returns 0 on success or -ERANGE on write when the range check fails.
61d9b56a
LR		 2698 */
2699int proc_douintvec_minmax(struct ctl_table *table, int write,
2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701{
2702 struct do_proc_douintvec_minmax_conv_param param = {
2703 .min = (unsigned int *) table->extra1,
2704 .max = (unsigned int *) table->extra2,
2705 };
2706 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2707 do_proc_douintvec_minmax_conv, &param);
2708}
2709
7a8d1819
JL		 2710static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2711 unsigned int *valp,
2712 int write, void *data)
2713{
7a8d1819 2714 if (write) {
fb910c42 2715 unsigned int val;
7a8d1819 2716
fb910c42 2717 val = round_pipe_size(*lvalp);
7a8d1819
JL		 2718 if (val == 0)
2719 return -EINVAL;
2720
7a8d1819
JL		 2721 *valp = val;
2722 } else {
2723 unsigned int val = *valp;
2724 *lvalp = (unsigned long) val;
2725 }
2726
2727 return 0;
2728}
2729
319e0a21
EB		 2730static int proc_dopipe_max_size(struct ctl_table *table, int write,
2731 void __user *buffer, size_t *lenp, loff_t *ppos)
7a8d1819 2732{
7a8d1819 2733 return do_proc_douintvec(table, write, buffer, lenp, ppos,
4c2e4bef 2734 do_proc_dopipe_max_size_conv, NULL);
7a8d1819
JL		 2735}
2736
54b50199
KC		 2737static void validate_coredump_safety(void)
2738{
046d662f 2739#ifdef CONFIG_COREDUMP
e579d2c2 2740 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199 2741 core_pattern[0] != '/' && core_pattern[0] != '|') {
760c6a91
AD		 2742 printk(KERN_WARNING
2743"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2744"Pipe handler or fully qualified core dump path required.\n"
2745"Set kernel.core_pattern before fs.suid_dumpable.\n"
2746 );
54b50199 2747 }
046d662f 2748#endif
54b50199
KC		 2749}
2750
2751static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2752 void __user *buffer, size_t *lenp, loff_t *ppos)
2753{
2754 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2755 if (!error)
2756 validate_coredump_safety();
2757 return error;
2758}
2759
046d662f 2760#ifdef CONFIG_COREDUMP
54b50199
KC		 2761static int proc_dostring_coredump(struct ctl_table *table, int write,
2762 void __user *buffer, size_t *lenp, loff_t *ppos)
2763{
2764 int error = proc_dostring(table, write, buffer, lenp, ppos);
2765 if (!error)
2766 validate_coredump_safety();
2767 return error;
2768}
046d662f 2769#endif
54b50199 2770
d8217f07 2771static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2772 void __user *buffer,
2773 size_t *lenp, loff_t *ppos,
2774 unsigned long convmul,
2775 unsigned long convdiv)
2776{
00b7c339
AW		 2777 unsigned long *i, *min, *max;
2778 int vleft, first = 1, err = 0;
00b7c339 2779 size_t left;
70f6cbb6 2780 char *kbuf = NULL, *p;
00b7c339
AW		 2781
2782 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2783 *lenp = 0;
2784 return 0;
2785 }
00b7c339 2786
fcfbd547 2787 i = (unsigned long *) data;
1da177e4
LT		 2788 min = (unsigned long *) table->extra1;
2789 max = (unsigned long *) table->extra2;
2790 vleft = table->maxlen / sizeof(unsigned long);
2791 left = *lenp;
00b7c339
AW		 2792
2793 if (write) {
d383d484
LR		 2794 if (proc_first_pos_non_zero_ignore(ppos, table))
2795 goto out;
f4aacea2 2796
00b7c339
AW		 2797 if (left > PAGE_SIZE - 1)
2798 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2799 p = kbuf = memdup_user_nul(buffer, left);
2800 if (IS_ERR(kbuf))
2801 return PTR_ERR(kbuf);
00b7c339
AW		 2802 }
2803
27b3d80a 2804 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2805 unsigned long val;
2806
1da177e4 2807 if (write) {
00b7c339
AW		 2808 bool neg;
2809
70f6cbb6 2810 left -= proc_skip_spaces(&p);
09be1784
CL		 2811 if (!left)
2812 break;
00b7c339 2813
70f6cbb6 2814 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2815 proc_wspace_sep,
2816 sizeof(proc_wspace_sep), NULL);
2817 if (err)
1da177e4
LT		 2818 break;
2819 if (neg)
1da177e4 2820 continue;
ff9f8a7c 2821 val = convmul * val / convdiv;
1da177e4
LT		 2822 if ((min && val < *min) || (max && val > *max))
2823 continue;
2824 *i = val;
2825 } else {
00b7c339 2826 val = convdiv * (*i) / convmul;
7833819d 2827 if (!first) {
00b7c339 2828 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2829 if (err)
2830 break;
2831 }
00b7c339
AW		 2832 err = proc_put_long(&buffer, &left, val, false);
2833 if (err)
2834 break;
1da177e4
LT		 2835 }
2836 }
2837
00b7c339
AW		 2838 if (!write && !first && left && !err)
2839 err = proc_put_char(&buffer, &left, '\n');
2840 if (write && !err)
70f6cbb6 2841 left -= proc_skip_spaces(&p);
1da177e4 2842 if (write) {
70f6cbb6 2843 kfree(kbuf);
00b7c339
AW		 2844 if (first)
2845 return err ? : -EINVAL;
1da177e4 2846 }
1da177e4 2847 *lenp -= left;
f4aacea2 2848out:
1da177e4 2849 *ppos += *lenp;
00b7c339 2850 return err;
1da177e4
LT		 2851}
2852
d8217f07 2853static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2854 void __user *buffer,
2855 size_t *lenp, loff_t *ppos,
2856 unsigned long convmul,
2857 unsigned long convdiv)
2858{
2859 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2860 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2861}
2862
1da177e4
LT		 2863/**
2864 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2865 * @table: the sysctl table
2866 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2867 * @buffer: the user buffer
2868 * @lenp: the size of the user buffer
2869 * @ppos: file position
2870 *
2871 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2872 * values from/to the user buffer, treated as an ASCII string.
2873 *
2874 * This routine will ensure the values are within the range specified by
2875 * table->extra1 (min) and table->extra2 (max).
2876 *
2877 * Returns 0 on success.
2878 */
8d65af78 2879int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2880 void __user *buffer, size_t *lenp, loff_t *ppos)
2881{
8d65af78 2882 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2883}
2884
2885/**
2886 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2887 * @table: the sysctl table
2888 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2889 * @buffer: the user buffer
2890 * @lenp: the size of the user buffer
2891 * @ppos: file position
2892 *
2893 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2894 * values from/to the user buffer, treated as an ASCII string. The values
2895 * are treated as milliseconds, and converted to jiffies when they are stored.
2896 *
2897 * This routine will ensure the values are within the range specified by
2898 * table->extra1 (min) and table->extra2 (max).
2899 *
2900 * Returns 0 on success.
2901 */
d8217f07 2902int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2903 void __user *buffer,
2904 size_t *lenp, loff_t *ppos)
2905{
8d65af78 2906 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2907 lenp, ppos, HZ, 1000l);
2908}
2909
2910
00b7c339 2911static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2912 int *valp,
2913 int write, void *data)
2914{
2915 if (write) {
63259457 2916 if (*lvalp > INT_MAX / HZ)
cba9f33d 2917 return 1;
1da177e4
LT		 2918 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2919 } else {
2920 int val = *valp;
2921 unsigned long lval;
2922 if (val < 0) {
00b7c339 2923 *negp = true;
9a5bc726 2924 lval = -(unsigned long)val;
1da177e4 2925 } else {
00b7c339 2926 *negp = false;
1da177e4
LT		 2927 lval = (unsigned long)val;
2928 }
2929 *lvalp = lval / HZ;
2930 }
2931 return 0;
2932}
2933
00b7c339 2934static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2935 int *valp,
2936 int write, void *data)
2937{
2938 if (write) {
cba9f33d
BS		 2939 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2940 return 1;
1da177e4
LT		 2941 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2942 } else {
2943 int val = *valp;
2944 unsigned long lval;
2945 if (val < 0) {
00b7c339 2946 *negp = true;
9a5bc726 2947 lval = -(unsigned long)val;
1da177e4 2948 } else {
00b7c339 2949 *negp = false;
1da177e4
LT		 2950 lval = (unsigned long)val;
2951 }
2952 *lvalp = jiffies_to_clock_t(lval);
2953 }
2954 return 0;
2955}
2956
00b7c339 2957static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2958 int *valp,
2959 int write, void *data)
2960{
2961 if (write) {
d738ce8f
FF		 2962 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2963
2964 if (jif > INT_MAX)
2965 return 1;
2966 *valp = (int)jif;
1da177e4
LT		 2967 } else {
2968 int val = *valp;
2969 unsigned long lval;
2970 if (val < 0) {
00b7c339 2971 *negp = true;
9a5bc726 2972 lval = -(unsigned long)val;
1da177e4 2973 } else {
00b7c339 2974 *negp = false;
1da177e4
LT		 2975 lval = (unsigned long)val;
2976 }
2977 *lvalp = jiffies_to_msecs(lval);
2978 }
2979 return 0;
2980}
2981
2982/**
2983 * proc_dointvec_jiffies - read a vector of integers as seconds
2984 * @table: the sysctl table
2985 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2986 * @buffer: the user buffer
2987 * @lenp: the size of the user buffer
2988 * @ppos: file position
2989 *
2990 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2991 * values from/to the user buffer, treated as an ASCII string.
2992 * The values read are assumed to be in seconds, and are converted into
2993 * jiffies.
2994 *
2995 * Returns 0 on success.
2996 */
8d65af78 2997int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2998 void __user *buffer, size_t *lenp, loff_t *ppos)
2999{
8d65af78 3000 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 3001 do_proc_dointvec_jiffies_conv,NULL);
3002}
3003
3004/**
3005 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3006 * @table: the sysctl table
3007 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 3008 * @buffer: the user buffer
3009 * @lenp: the size of the user buffer
1e5d5331 3010 * @ppos: pointer to the file position
1da177e4
LT		 3011 *
3012 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3013 * values from/to the user buffer, treated as an ASCII string.
3014 * The values read are assumed to be in 1/USER_HZ seconds, and
3015 * are converted into jiffies.
3016 *
3017 * Returns 0 on success.
3018 */
8d65af78 3019int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3020 void __user *buffer, size_t *lenp, loff_t *ppos)
3021{
8d65af78 3022 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 3023 do_proc_dointvec_userhz_jiffies_conv,NULL);
3024}
3025
3026/**
3027 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3028 * @table: the sysctl table
3029 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 3030 * @buffer: the user buffer
3031 * @lenp: the size of the user buffer
67be2dd1
MW		 3032 * @ppos: file position
3033 * @ppos: the current position in the file
1da177e4
LT		 3034 *
3035 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3036 * values from/to the user buffer, treated as an ASCII string.
3037 * The values read are assumed to be in 1/1000 seconds, and
3038 * are converted into jiffies.
3039 *
3040 * Returns 0 on success.
3041 */
8d65af78 3042int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3043 void __user *buffer, size_t *lenp, loff_t *ppos)
3044{
8d65af78 3045 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 3046 do_proc_dointvec_ms_jiffies_conv, NULL);
3047}
3048
8d65af78 3049static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 3050 void __user *buffer, size_t *lenp, loff_t *ppos)
3051{
3052 struct pid *new_pid;
3053 pid_t tmp;
3054 int r;
3055
6c5f3e7b 3056 tmp = pid_vnr(cad_pid);
9ec52099 3057
8d65af78 3058 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 3059 lenp, ppos, NULL, NULL);
3060 if (r || !write)
3061 return r;
3062
3063 new_pid = find_get_pid(tmp);
3064 if (!new_pid)
3065 return -ESRCH;
3066
3067 put_pid(xchg(&cad_pid, new_pid));
3068 return 0;
3069}
3070
9f977fb7
OP		 3071/**
3072 * proc_do_large_bitmap - read/write from/to a large bitmap
3073 * @table: the sysctl table
3074 * @write: %TRUE if this is a write to the sysctl file
3075 * @buffer: the user buffer
3076 * @lenp: the size of the user buffer
3077 * @ppos: file position
3078 *
3079 * The bitmap is stored at table->data and the bitmap length (in bits)
3080 * in table->maxlen.
3081 *
3082 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3083 * large bitmaps may be represented in a compact manner. Writing into
3084 * the file will clear the bitmap then update it with the given input.
3085 *
3086 * Returns 0 on success.
3087 */
3088int proc_do_large_bitmap(struct ctl_table *table, int write,
3089 void __user *buffer, size_t *lenp, loff_t *ppos)
3090{
3091 int err = 0;
3092 bool first = 1;
3093 size_t left = *lenp;
3094 unsigned long bitmap_len = table->maxlen;
122ff243 3095 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 3096 unsigned long *tmp_bitmap = NULL;
3097 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3098
122ff243 3099 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 3100 *lenp = 0;
3101 return 0;
3102 }
3103
3104 if (write) {
70f6cbb6 3105 char *kbuf, *p;
9f977fb7
OP		 3106
3107 if (left > PAGE_SIZE - 1)
3108 left = PAGE_SIZE - 1;
3109
70f6cbb6
AV		 3110 p = kbuf = memdup_user_nul(buffer, left);
3111 if (IS_ERR(kbuf))
3112 return PTR_ERR(kbuf);
9f977fb7 3113
6396bb22
KC		 3114 tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len),
3115 sizeof(unsigned long),
9f977fb7
OP		 3116 GFP_KERNEL);
3117 if (!tmp_bitmap) {
70f6cbb6 3118 kfree(kbuf);
9f977fb7
OP		 3119 return -ENOMEM;
3120 }
70f6cbb6 3121 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 3122 while (!err && left) {
3123 unsigned long val_a, val_b;
3124 bool neg;
3125
70f6cbb6 3126 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 3127 sizeof(tr_a), &c);
3128 if (err)
3129 break;
3130 if (val_a >= bitmap_len || neg) {
3131 err = -EINVAL;
3132 break;
3133 }
3134
3135 val_b = val_a;
3136 if (left) {
70f6cbb6 3137 p++;
9f977fb7
OP		 3138 left--;
3139 }
3140
3141 if (c == '-') {
70f6cbb6 3142 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 3143 &neg, tr_b, sizeof(tr_b),
3144 &c);
3145 if (err)
3146 break;
3147 if (val_b >= bitmap_len || neg ||
3148 val_a > val_b) {
3149 err = -EINVAL;
3150 break;
3151 }
3152 if (left) {
70f6cbb6 3153 p++;
9f977fb7
OP		 3154 left--;
3155 }
3156 }
3157
5a04cca6 3158 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 3159 first = 0;
70f6cbb6 3160 proc_skip_char(&p, &left, '\n');
9f977fb7 3161 }
70f6cbb6 3162 kfree(kbuf);
9f977fb7
OP		 3163 } else {
3164 unsigned long bit_a, bit_b = 0;
3165
3166 while (left) {
3167 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3168 if (bit_a >= bitmap_len)
3169 break;
3170 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3171 bit_a + 1) - 1;
3172
3173 if (!first) {
3174 err = proc_put_char(&buffer, &left, ',');
3175 if (err)
3176 break;
3177 }
3178 err = proc_put_long(&buffer, &left, bit_a, false);
3179 if (err)
3180 break;
3181 if (bit_a != bit_b) {
3182 err = proc_put_char(&buffer, &left, '-');
3183 if (err)
3184 break;
3185 err = proc_put_long(&buffer, &left, bit_b, false);
3186 if (err)
3187 break;
3188 }
3189
3190 first = 0; bit_b++;
3191 }
3192 if (!err)
3193 err = proc_put_char(&buffer, &left, '\n');
3194 }
3195
3196 if (!err) {
3197 if (write) {
3198 if (*ppos)
3199 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3200 else
5a04cca6 3201 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7 3202 }
9f977fb7
OP		 3203 *lenp -= left;
3204 *ppos += *lenp;
9f977fb7 3205 }
f9eb2fdd
OK		 3206
3207 kfree(tmp_bitmap);
3208 return err;
9f977fb7
OP		 3209}
3210
55610500 3211#else /* CONFIG_PROC_SYSCTL */
1da177e4 3212
8d65af78 3213int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 3214 void __user *buffer, size_t *lenp, loff_t *ppos)
3215{
3216 return -ENOSYS;
3217}
3218
8d65af78 3219int proc_dointvec(struct ctl_table *table, int write,
1da177e4 3220 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 3221{
3222 return -ENOSYS;
3223}
3224
e7d316a0
SAK		 3225int proc_douintvec(struct ctl_table *table, int write,
3226 void __user *buffer, size_t *lenp, loff_t *ppos)
3227{
3228 return -ENOSYS;
3229}
3230
8d65af78 3231int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3232 void __user *buffer, size_t *lenp, loff_t *ppos)
3233{
3234 return -ENOSYS;
3235}
3236
61d9b56a
LR		 3237int proc_douintvec_minmax(struct ctl_table *table, int write,
3238 void __user *buffer, size_t *lenp, loff_t *ppos)
3239{
3240 return -ENOSYS;
3241}
3242
8d65af78 3243int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3244 void __user *buffer, size_t *lenp, loff_t *ppos)
3245{
3246 return -ENOSYS;
3247}
3248
8d65af78 3249int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3250 void __user *buffer, size_t *lenp, loff_t *ppos)
3251{
3252 return -ENOSYS;
3253}
3254
8d65af78 3255int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3256 void __user *buffer, size_t *lenp, loff_t *ppos)
3257{
3258 return -ENOSYS;
3259}
3260
8d65af78 3261int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3262 void __user *buffer, size_t *lenp, loff_t *ppos)
3263{
3264 return -ENOSYS;
3265}
3266
d8217f07 3267int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3268 void __user *buffer,
3269 size_t *lenp, loff_t *ppos)
3270{
3271 return -ENOSYS;
3272}
3273
3274
55610500 3275#endif /* CONFIG_PROC_SYSCTL */
1da177e4 3276
3fcc5530 3277#ifdef CONFIG_BPF_SYSCALL
492ecee8
AS		 3278static int proc_dointvec_minmax_bpf_stats(struct ctl_table *table, int write,
3279 void __user *buffer, size_t *lenp,
3280 loff_t *ppos)
3281{
3282 int ret, bpf_stats = *(int *)table->data;
3283 struct ctl_table tmp = *table;
3284
3285 if (write && !capable(CAP_SYS_ADMIN))
3286 return -EPERM;
3287
3288 tmp.data = &bpf_stats;
3289 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3290 if (write && !ret) {
3291 *(int *)table->data = bpf_stats;
3292 if (bpf_stats)
3293 static_branch_enable(&bpf_stats_enabled_key);
3294 else
3295 static_branch_disable(&bpf_stats_enabled_key);
3296 }
3297 return ret;
3298}
3fcc5530 3299#endif
1da177e4
LT		 3300/*
3301 * No sense putting this after each symbol definition, twice,
3302 * exception granted :-)
3303 */
3304EXPORT_SYMBOL(proc_dointvec);
e7d316a0 3305EXPORT_SYMBOL(proc_douintvec);
1da177e4
LT		 3306EXPORT_SYMBOL(proc_dointvec_jiffies);
3307EXPORT_SYMBOL(proc_dointvec_minmax);
61d9b56a 3308EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
1da177e4
LT		 3309EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3310EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3311EXPORT_SYMBOL(proc_dostring);
3312EXPORT_SYMBOL(proc_doulongvec_minmax);
3313EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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