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mm/hugetlb: define a generic fallback for arch_clear_hugepage_flags()
[mirror_ubuntu-jammy-kernel.git] / kernel / sysctl.c
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457c8996 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 2/*
3 * sysctl.c: General linux system control interface
4 *
5 * Begun 24 March 1995, Stephen Tweedie
6 * Added /proc support, Dec 1995
7 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
8 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
9 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
10 * Dynamic registration fixes, Stephen Tweedie.
11 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
12 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Horn.
14 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
15 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
16 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * Wendling.
18 * The list_for_each() macro wasn't appropriate for the sysctl loop.
19 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
20 */
21
1da177e4 22#include <linux/module.h>
e2e40f2c 23#include <linux/aio.h>
1da177e4
LT		 24#include <linux/mm.h>
25#include <linux/swap.h>
26#include <linux/slab.h>
27#include <linux/sysctl.h>
5a04cca6 28#include <linux/bitmap.h>
d33ed52d 29#include <linux/signal.h>
455cd5ab 30#include <linux/printk.h>
1da177e4 31#include <linux/proc_fs.h>
72c2d582 32#include <linux/security.h>
1da177e4 33#include <linux/ctype.h>
fd4b616b 34#include <linux/kmemleak.h>
62239ac2 35#include <linux/fs.h>
1da177e4
LT		 36#include <linux/init.h>
37#include <linux/kernel.h>
0296b228 38#include <linux/kobject.h>
20380731 39#include <linux/net.h>
1da177e4
LT		 40#include <linux/sysrq.h>
41#include <linux/highuid.h>
42#include <linux/writeback.h>
3fff4c42 43#include <linux/ratelimit.h>
76ab0f53 44#include <linux/compaction.h>
1da177e4 45#include <linux/hugetlb.h>
1da177e4 46#include <linux/initrd.h>
0b77f5bf 47#include <linux/key.h>
1da177e4
LT		 48#include <linux/times.h>
49#include <linux/limits.h>
50#include <linux/dcache.h>
6e006701 51#include <linux/dnotify.h>
1da177e4 52#include <linux/syscalls.h>
c748e134 53#include <linux/vmstat.h>
c255d844
PM		 54#include <linux/nfs_fs.h>
55#include <linux/acpi.h>
10a0a8d4 56#include <linux/reboot.h>
b0fc494f 57#include <linux/ftrace.h>
cdd6c482 58#include <linux/perf_event.h>
b2be84df 59#include <linux/kprobes.h>
b492e95b 60#include <linux/pipe_fs_i.h>
8e4228e1 61#include <linux/oom.h>
17f60a7d 62#include <linux/kmod.h>
73efc039 63#include <linux/capability.h>
40401530 64#include <linux/binfmts.h>
cf4aebc2 65#include <linux/sched/sysctl.h>
f7ccbae4 66#include <linux/sched/coredump.h>
7984754b 67#include <linux/kexec.h>
1be7f75d 68#include <linux/bpf.h>
d2921684 69#include <linux/mount.h>
cefdca0a 70#include <linux/userfaultfd_k.h>
1da177e4 71
7f2923c4
CB		 72#include "../lib/kstrtox.h"
73
7c0f6ba6 74#include <linux/uaccess.h>
1da177e4
LT		 75#include <asm/processor.h>
76
29cbc78b
AK		 77#ifdef CONFIG_X86
78#include <asm/nmi.h>
0741f4d2 79#include <asm/stacktrace.h>
6e7c4025 80#include <asm/io.h>
29cbc78b 81#endif
d550bbd4
DH		 82#ifdef CONFIG_SPARC
83#include <asm/setup.h>
84#endif
c55b7c3e
DY		 85#ifdef CONFIG_BSD_PROCESS_ACCT
86#include <linux/acct.h>
87#endif
4f0e056f
DY		 88#ifdef CONFIG_RT_MUTEXES
89#include <linux/rtmutex.h>
90#endif
2edf5e49
DY		 91#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
92#include <linux/lockdep.h>
93#endif
15485a46
DY		 94#ifdef CONFIG_CHR_DEV_SG
95#include <scsi/sg.h>
96#endif
964c9dff
AP		 97#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
98#include <linux/stackleak.h>
99#endif
58687acb 100#ifdef CONFIG_LOCKUP_DETECTOR
504d7cf1
DZ		 101#include <linux/nmi.h>
102#endif
103
1da177e4
LT		 104#if defined(CONFIG_SYSCTL)
105
106/* External variables not in a header file. */
d6e71144 107extern int suid_dumpable;
046d662f
AK		 108#ifdef CONFIG_COREDUMP
109extern int core_uses_pid;
1da177e4 110extern char core_pattern[];
a293980c 111extern unsigned int core_pipe_limit;
046d662f 112#endif
1da177e4 113extern int pid_max;
1da177e4 114extern int pid_max_min, pid_max_max;
8ad4b1fb 115extern int percpu_pagelist_fraction;
9745512c 116extern int latencytop_enabled;
9b80a184 117extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 118#ifndef CONFIG_MMU
119extern int sysctl_nr_trim_pages;
120#endif
1da177e4 121
c4f3b63f 122/* Constants used for minimum and maximum */
2508ce18 123#ifdef CONFIG_LOCKUP_DETECTOR
c4f3b63f
RT		 124static int sixty = 60;
125#endif
126
270750db 127static int __maybe_unused neg_one = -1;
cd5f9a4c 128static int __maybe_unused two = 2;
5509a5d2 129static int __maybe_unused four = 4;
9002b214 130static unsigned long zero_ul;
fc3501d4 131static unsigned long one_ul = 1;
32a5ad9c 132static unsigned long long_max = LONG_MAX;
c4f3b63f 133static int one_hundred = 100;
795ae7a0 134static int one_thousand = 1000;
af91322e
DY		 135#ifdef CONFIG_PRINTK
136static int ten_thousand = 10000;
137#endif
c5dfd78e
ACM		 138#ifdef CONFIG_PERF_EVENTS
139static int six_hundred_forty_kb = 640 * 1024;
140#endif
c4f3b63f 141
9e4a5bda
AR		 142/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
143static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
144
1da177e4
LT		 145/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
146static int maxolduid = 65535;
147static int minolduid;
148
149static int ngroups_max = NGROUPS_MAX;
73efc039 150static const int cap_last_cap = CAP_LAST_CAP;
1da177e4 151
a2e51445
DV		 152/*
153 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
154 * and hung_task_check_interval_secs
155 */
80df2847
LH		 156#ifdef CONFIG_DETECT_HUNG_TASK
157static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
158#endif
159
d14f1729
DY		 160#ifdef CONFIG_INOTIFY_USER
161#include <linux/inotify.h>
162#endif
72c57ed5 163#ifdef CONFIG_SPARC
1da177e4
LT		 164#endif
165
b67114db 166#ifdef CONFIG_PARISC
1da177e4 167extern int pwrsw_enabled;
bf14e3b9
VG		 168#endif
169
170#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4
LT		 171extern int unaligned_enabled;
172#endif
1da177e4 173
d2b176ed 174#ifdef CONFIG_IA64
88fc241f 175extern int unaligned_dump_stack;
d2b176ed
JS		 176#endif
177
b6fca725
VG		 178#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
179extern int no_unaligned_warning;
180#endif
181
d6f8ff73 182#ifdef CONFIG_PROC_SYSCTL
f4aacea2 183
a19ac337
LR		 184/**
185 * enum sysctl_writes_mode - supported sysctl write modes
186 *
187 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
65f50f25
WH		 188 * to be written, and multiple writes on the same sysctl file descriptor
189 * will rewrite the sysctl value, regardless of file position. No warning
190 * is issued when the initial position is not 0.
a19ac337 191 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
65f50f25 192 * not 0.
a19ac337 193 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
65f50f25
WH		 194 * file position 0 and the value must be fully contained in the buffer
195 * sent to the write syscall. If dealing with strings respect the file
196 * position, but restrict this to the max length of the buffer, anything
197 * passed the max length will be ignored. Multiple writes will append
198 * to the buffer.
a19ac337
LR		 199 *
200 * These write modes control how current file position affects the behavior of
201 * updating sysctl values through the proc interface on each write.
202 */
203enum sysctl_writes_mode {
204 SYSCTL_WRITES_LEGACY = -1,
205 SYSCTL_WRITES_WARN = 0,
206 SYSCTL_WRITES_STRICT = 1,
207};
f4aacea2 208
a19ac337 209static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
f4aacea2 210
8d65af78 211static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 212 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 213static int proc_taint(struct ctl_table *table, int write,
34f5a398 214 void __user *buffer, size_t *lenp, loff_t *ppos);
6923aa0d
SAS		 215#ifdef CONFIG_COMPACTION
216static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
217 int write, void __user *buffer,
218 size_t *lenp, loff_t *ppos);
219#endif
d6f8ff73 220#endif
9ec52099 221
bfdc0b49 222#ifdef CONFIG_PRINTK
620f6e8e 223static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 224 void __user *buffer, size_t *lenp, loff_t *ppos);
225#endif
226
54b50199
KC		 227static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
228 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 229#ifdef CONFIG_COREDUMP
54b50199
KC		 230static int proc_dostring_coredump(struct ctl_table *table, int write,
231 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 232#endif
319e0a21
EB		 233static int proc_dopipe_max_size(struct ctl_table *table, int write,
234 void __user *buffer, size_t *lenp, loff_t *ppos);
54b50199 235
97f5f0cd 236#ifdef CONFIG_MAGIC_SYSRQ
6f8fd1d7 237static int sysrq_sysctl_handler(struct ctl_table *table, int write,
eaee4172 238 void __user *buffer, size_t *lenp, loff_t *ppos);
97f5f0cd
DT		 239#endif
240
d8217f07
EB		 241static struct ctl_table kern_table[];
242static struct ctl_table vm_table[];
243static struct ctl_table fs_table[];
244static struct ctl_table debug_table[];
245static struct ctl_table dev_table[];
246extern struct ctl_table random_table[];
7ef9964e
DL		 247#ifdef CONFIG_EPOLL
248extern struct ctl_table epoll_table[];
249#endif
1da177e4 250
ceb18132
LR		 251#ifdef CONFIG_FW_LOADER_USER_HELPER
252extern struct ctl_table firmware_config_table[];
253#endif
254
67f3977f
AG		 255#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
256 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
1da177e4
LT		 257int sysctl_legacy_va_layout;
258#endif
259
1da177e4
LT		 260/* The default sysctl tables: */
261
de4e83bd 262static struct ctl_table sysctl_base_table[] = {
1da177e4 263 {
1da177e4
LT		 264 .procname = "kernel",
265 .mode = 0555,
266 .child = kern_table,
267 },
268 {
1da177e4
LT		 269 .procname = "vm",
270 .mode = 0555,
271 .child = vm_table,
272 },
1da177e4 273 {
1da177e4
LT		 274 .procname = "fs",
275 .mode = 0555,
276 .child = fs_table,
277 },
278 {
1da177e4
LT		 279 .procname = "debug",
280 .mode = 0555,
281 .child = debug_table,
282 },
283 {
1da177e4
LT		 284 .procname = "dev",
285 .mode = 0555,
286 .child = dev_table,
287 },
6fce56ec 288 { }
1da177e4
LT		 289};
290
77e54a1f 291#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 292static int min_sched_granularity_ns = 100000; /* 100 usecs */
293static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
294static int min_wakeup_granularity_ns; /* 0 usecs */
295static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
cbee9f88 296#ifdef CONFIG_SMP
1983a922
CE		 297static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
298static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
cbee9f88
PZ		 299#endif /* CONFIG_SMP */
300#endif /* CONFIG_SCHED_DEBUG */
77e54a1f 301
5e771905
MG		 302#ifdef CONFIG_COMPACTION
303static int min_extfrag_threshold;
304static int max_extfrag_threshold = 1000;
305#endif
306
d8217f07 307static struct ctl_table kern_table[] = {
2bba22c5 308 {
2bba22c5
MG		 309 .procname = "sched_child_runs_first",
310 .data = &sysctl_sched_child_runs_first,
311 .maxlen = sizeof(unsigned int),
312 .mode = 0644,
6d456111 313 .proc_handler = proc_dointvec,
2bba22c5 314 },
77e54a1f
IM		 315#ifdef CONFIG_SCHED_DEBUG
316 {
b2be5e96
PZ		 317 .procname = "sched_min_granularity_ns",
318 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 319 .maxlen = sizeof(unsigned int),
320 .mode = 0644,
702a7c76 321 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 322 .extra1 = &min_sched_granularity_ns,
323 .extra2 = &max_sched_granularity_ns,
77e54a1f 324 },
21805085 325 {
21805085
PZ		 326 .procname = "sched_latency_ns",
327 .data = &sysctl_sched_latency,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
702a7c76 330 .proc_handler = sched_proc_update_handler,
21805085
PZ		 331 .extra1 = &min_sched_granularity_ns,
332 .extra2 = &max_sched_granularity_ns,
333 },
77e54a1f 334 {
77e54a1f
IM		 335 .procname = "sched_wakeup_granularity_ns",
336 .data = &sysctl_sched_wakeup_granularity,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
702a7c76 339 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 340 .extra1 = &min_wakeup_granularity_ns,
341 .extra2 = &max_wakeup_granularity_ns,
342 },
cbee9f88 343#ifdef CONFIG_SMP
1983a922 344 {
1983a922
CE		 345 .procname = "sched_tunable_scaling",
346 .data = &sysctl_sched_tunable_scaling,
347 .maxlen = sizeof(enum sched_tunable_scaling),
348 .mode = 0644,
702a7c76 349 .proc_handler = sched_proc_update_handler,
1983a922
CE		 350 .extra1 = &min_sched_tunable_scaling,
351 .extra2 = &max_sched_tunable_scaling,
2398f2c6 352 },
da84d961 353 {
d00535db 354 .procname = "sched_migration_cost_ns",
da84d961
IM		 355 .data = &sysctl_sched_migration_cost,
356 .maxlen = sizeof(unsigned int),
357 .mode = 0644,
6d456111 358 .proc_handler = proc_dointvec,
da84d961 359 },
b82d9fdd 360 {
b82d9fdd
PZ		 361 .procname = "sched_nr_migrate",
362 .data = &sysctl_sched_nr_migrate,
363 .maxlen = sizeof(unsigned int),
fa85ae24 364 .mode = 0644,
6d456111 365 .proc_handler = proc_dointvec,
fa85ae24 366 },
cb251765
MG		 367#ifdef CONFIG_SCHEDSTATS
368 {
369 .procname = "sched_schedstats",
370 .data = NULL,
371 .maxlen = sizeof(unsigned int),
372 .mode = 0644,
373 .proc_handler = sysctl_schedstats,
eec4844f
MC		 374 .extra1 = SYSCTL_ZERO,
375 .extra2 = SYSCTL_ONE,
cb251765
MG		 376 },
377#endif /* CONFIG_SCHEDSTATS */
cbee9f88
PZ		 378#endif /* CONFIG_SMP */
379#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 380 {
381 .procname = "numa_balancing_scan_delay_ms",
382 .data = &sysctl_numa_balancing_scan_delay,
383 .maxlen = sizeof(unsigned int),
384 .mode = 0644,
385 .proc_handler = proc_dointvec,
386 },
cbee9f88
PZ		 387 {
388 .procname = "numa_balancing_scan_period_min_ms",
389 .data = &sysctl_numa_balancing_scan_period_min,
390 .maxlen = sizeof(unsigned int),
391 .mode = 0644,
392 .proc_handler = proc_dointvec,
393 },
394 {
395 .procname = "numa_balancing_scan_period_max_ms",
396 .data = &sysctl_numa_balancing_scan_period_max,
397 .maxlen = sizeof(unsigned int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec,
400 },
6e5fb223
PZ		 401 {
402 .procname = "numa_balancing_scan_size_mb",
403 .data = &sysctl_numa_balancing_scan_size,
404 .maxlen = sizeof(unsigned int),
405 .mode = 0644,
64192658 406 .proc_handler = proc_dointvec_minmax,
eec4844f 407 .extra1 = SYSCTL_ONE,
6e5fb223 408 },
54a43d54
AK		 409 {
410 .procname = "numa_balancing",
411 .data = NULL, /* filled in by handler */
412 .maxlen = sizeof(unsigned int),
413 .mode = 0644,
414 .proc_handler = sysctl_numa_balancing,
eec4844f
MC		 415 .extra1 = SYSCTL_ZERO,
416 .extra2 = SYSCTL_ONE,
54a43d54 417 },
cbee9f88
PZ		 418#endif /* CONFIG_NUMA_BALANCING */
419#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 420 {
9f0c1e56
PZ		 421 .procname = "sched_rt_period_us",
422 .data = &sysctl_sched_rt_period,
423 .maxlen = sizeof(unsigned int),
424 .mode = 0644,
6d456111 425 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 426 },
427 {
9f0c1e56
PZ		 428 .procname = "sched_rt_runtime_us",
429 .data = &sysctl_sched_rt_runtime,
430 .maxlen = sizeof(int),
431 .mode = 0644,
6d456111 432 .proc_handler = sched_rt_handler,
9f0c1e56 433 },
ce0dbbbb
CW		 434 {
435 .procname = "sched_rr_timeslice_ms",
975e155e 436 .data = &sysctl_sched_rr_timeslice,
ce0dbbbb
CW		 437 .maxlen = sizeof(int),
438 .mode = 0644,
439 .proc_handler = sched_rr_handler,
440 },
e8f14172
PB		 441#ifdef CONFIG_UCLAMP_TASK
442 {
443 .procname = "sched_util_clamp_min",
444 .data = &sysctl_sched_uclamp_util_min,
445 .maxlen = sizeof(unsigned int),
446 .mode = 0644,
447 .proc_handler = sysctl_sched_uclamp_handler,
448 },
449 {
450 .procname = "sched_util_clamp_max",
451 .data = &sysctl_sched_uclamp_util_max,
452 .maxlen = sizeof(unsigned int),
453 .mode = 0644,
454 .proc_handler = sysctl_sched_uclamp_handler,
455 },
456#endif
5091faa4
MG		 457#ifdef CONFIG_SCHED_AUTOGROUP
458 {
459 .procname = "sched_autogroup_enabled",
460 .data = &sysctl_sched_autogroup_enabled,
461 .maxlen = sizeof(unsigned int),
462 .mode = 0644,
1747b21f 463 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 464 .extra1 = SYSCTL_ZERO,
465 .extra2 = SYSCTL_ONE,
5091faa4
MG		 466 },
467#endif
ec12cb7f
PT		 468#ifdef CONFIG_CFS_BANDWIDTH
469 {
470 .procname = "sched_cfs_bandwidth_slice_us",
471 .data = &sysctl_sched_cfs_bandwidth_slice,
472 .maxlen = sizeof(unsigned int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec_minmax,
eec4844f 475 .extra1 = SYSCTL_ONE,
ec12cb7f
PT		 476 },
477#endif
8d5d0cfb
QP		 478#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
479 {
480 .procname = "sched_energy_aware",
481 .data = &sysctl_sched_energy_aware,
482 .maxlen = sizeof(unsigned int),
483 .mode = 0644,
484 .proc_handler = sched_energy_aware_handler,
eec4844f
MC		 485 .extra1 = SYSCTL_ZERO,
486 .extra2 = SYSCTL_ONE,
8d5d0cfb
QP		 487 },
488#endif
f20786ff
PZ		 489#ifdef CONFIG_PROVE_LOCKING
490 {
f20786ff
PZ		 491 .procname = "prove_locking",
492 .data = &prove_locking,
493 .maxlen = sizeof(int),
494 .mode = 0644,
6d456111 495 .proc_handler = proc_dointvec,
f20786ff
PZ		 496 },
497#endif
498#ifdef CONFIG_LOCK_STAT
499 {
f20786ff
PZ		 500 .procname = "lock_stat",
501 .data = &lock_stat,
502 .maxlen = sizeof(int),
503 .mode = 0644,
6d456111 504 .proc_handler = proc_dointvec,
f20786ff 505 },
77e54a1f 506#endif
1da177e4 507 {
1da177e4
LT		 508 .procname = "panic",
509 .data = &panic_timeout,
510 .maxlen = sizeof(int),
511 .mode = 0644,
6d456111 512 .proc_handler = proc_dointvec,
1da177e4 513 },
046d662f 514#ifdef CONFIG_COREDUMP
1da177e4 515 {
1da177e4
LT		 516 .procname = "core_uses_pid",
517 .data = &core_uses_pid,
518 .maxlen = sizeof(int),
519 .mode = 0644,
6d456111 520 .proc_handler = proc_dointvec,
1da177e4
LT		 521 },
522 {
1da177e4
LT		 523 .procname = "core_pattern",
524 .data = core_pattern,
71ce92f3 525 .maxlen = CORENAME_MAX_SIZE,
1da177e4 526 .mode = 0644,
54b50199 527 .proc_handler = proc_dostring_coredump,
1da177e4 528 },
a293980c 529 {
a293980c
NH		 530 .procname = "core_pipe_limit",
531 .data = &core_pipe_limit,
532 .maxlen = sizeof(unsigned int),
533 .mode = 0644,
6d456111 534 .proc_handler = proc_dointvec,
a293980c 535 },
046d662f 536#endif
34f5a398 537#ifdef CONFIG_PROC_SYSCTL
1da177e4 538 {
1da177e4 539 .procname = "tainted",
25ddbb18 540 .maxlen = sizeof(long),
34f5a398 541 .mode = 0644,
6d456111 542 .proc_handler = proc_taint,
1da177e4 543 },
f4aacea2
KC		 544 {
545 .procname = "sysctl_writes_strict",
546 .data = &sysctl_writes_strict,
547 .maxlen = sizeof(int),
548 .mode = 0644,
549 .proc_handler = proc_dointvec_minmax,
550 .extra1 = &neg_one,
eec4844f 551 .extra2 = SYSCTL_ONE,
f4aacea2 552 },
34f5a398 553#endif
9745512c
AV		 554#ifdef CONFIG_LATENCYTOP
555 {
556 .procname = "latencytop",
557 .data = &latencytop_enabled,
558 .maxlen = sizeof(int),
559 .mode = 0644,
cb251765 560 .proc_handler = sysctl_latencytop,
9745512c
AV		 561 },
562#endif
1da177e4
LT		 563#ifdef CONFIG_BLK_DEV_INITRD
564 {
1da177e4
LT		 565 .procname = "real-root-dev",
566 .data = &real_root_dev,
567 .maxlen = sizeof(int),
568 .mode = 0644,
6d456111 569 .proc_handler = proc_dointvec,
1da177e4
LT		 570 },
571#endif
45807a1d 572 {
45807a1d
IM		 573 .procname = "print-fatal-signals",
574 .data = &print_fatal_signals,
575 .maxlen = sizeof(int),
576 .mode = 0644,
6d456111 577 .proc_handler = proc_dointvec,
45807a1d 578 },
72c57ed5 579#ifdef CONFIG_SPARC
1da177e4 580 {
1da177e4
LT		 581 .procname = "reboot-cmd",
582 .data = reboot_command,
583 .maxlen = 256,
584 .mode = 0644,
6d456111 585 .proc_handler = proc_dostring,
1da177e4
LT		 586 },
587 {
1da177e4
LT		 588 .procname = "stop-a",
589 .data = &stop_a_enabled,
590 .maxlen = sizeof (int),
591 .mode = 0644,
6d456111 592 .proc_handler = proc_dointvec,
1da177e4
LT		 593 },
594 {
1da177e4
LT		 595 .procname = "scons-poweroff",
596 .data = &scons_pwroff,
597 .maxlen = sizeof (int),
598 .mode = 0644,
6d456111 599 .proc_handler = proc_dointvec,
1da177e4
LT		 600 },
601#endif
0871420f
DM		 602#ifdef CONFIG_SPARC64
603 {
0871420f
DM		 604 .procname = "tsb-ratio",
605 .data = &sysctl_tsb_ratio,
606 .maxlen = sizeof (int),
607 .mode = 0644,
6d456111 608 .proc_handler = proc_dointvec,
0871420f
DM		 609 },
610#endif
b67114db 611#ifdef CONFIG_PARISC
1da177e4 612 {
1da177e4
LT		 613 .procname = "soft-power",
614 .data = &pwrsw_enabled,
615 .maxlen = sizeof (int),
616 .mode = 0644,
6d456111 617 .proc_handler = proc_dointvec,
1da177e4 618 },
bf14e3b9
VG		 619#endif
620#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 621 {
1da177e4
LT		 622 .procname = "unaligned-trap",
623 .data = &unaligned_enabled,
624 .maxlen = sizeof (int),
625 .mode = 0644,
6d456111 626 .proc_handler = proc_dointvec,
1da177e4
LT		 627 },
628#endif
629 {
1da177e4
LT		 630 .procname = "ctrl-alt-del",
631 .data = &C_A_D,
632 .maxlen = sizeof(int),
633 .mode = 0644,
6d456111 634 .proc_handler = proc_dointvec,
1da177e4 635 },
606576ce 636#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 637 {
b0fc494f
SR		 638 .procname = "ftrace_enabled",
639 .data = &ftrace_enabled,
640 .maxlen = sizeof(int),
641 .mode = 0644,
6d456111 642 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 643 },
644#endif
f38f1d2a
SR		 645#ifdef CONFIG_STACK_TRACER
646 {
f38f1d2a
SR		 647 .procname = "stack_tracer_enabled",
648 .data = &stack_tracer_enabled,
649 .maxlen = sizeof(int),
650 .mode = 0644,
6d456111 651 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 652 },
653#endif
944ac425
SR		 654#ifdef CONFIG_TRACING
655 {
3299b4dd 656 .procname = "ftrace_dump_on_oops",
944ac425
SR		 657 .data = &ftrace_dump_on_oops,
658 .maxlen = sizeof(int),
659 .mode = 0644,
6d456111 660 .proc_handler = proc_dointvec,
944ac425 661 },
de7edd31
SRRH		 662 {
663 .procname = "traceoff_on_warning",
664 .data = &__disable_trace_on_warning,
665 .maxlen = sizeof(__disable_trace_on_warning),
666 .mode = 0644,
667 .proc_handler = proc_dointvec,
668 },
0daa2302
SRRH		 669 {
670 .procname = "tracepoint_printk",
671 .data = &tracepoint_printk,
672 .maxlen = sizeof(tracepoint_printk),
673 .mode = 0644,
42391745 674 .proc_handler = tracepoint_printk_sysctl,
0daa2302 675 },
944ac425 676#endif
2965faa5 677#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 678 {
679 .procname = "kexec_load_disabled",
680 .data = &kexec_load_disabled,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 /* only handle a transition from default "0" to "1" */
684 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 685 .extra1 = SYSCTL_ONE,
686 .extra2 = SYSCTL_ONE,
7984754b
KC		 687 },
688#endif
a1ef5adb 689#ifdef CONFIG_MODULES
1da177e4 690 {
1da177e4
LT		 691 .procname = "modprobe",
692 .data = &modprobe_path,
693 .maxlen = KMOD_PATH_LEN,
694 .mode = 0644,
6d456111 695 .proc_handler = proc_dostring,
1da177e4 696 },
3d43321b 697 {
3d43321b
KC		 698 .procname = "modules_disabled",
699 .data = &modules_disabled,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 /* only handle a transition from default "0" to "1" */
6d456111 703 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 704 .extra1 = SYSCTL_ONE,
705 .extra2 = SYSCTL_ONE,
3d43321b 706 },
1da177e4 707#endif
86d56134 708#ifdef CONFIG_UEVENT_HELPER
1da177e4 709 {
1da177e4 710 .procname = "hotplug",
312c004d
KS		 711 .data = &uevent_helper,
712 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 713 .mode = 0644,
6d456111 714 .proc_handler = proc_dostring,
1da177e4 715 },
86d56134 716#endif
1da177e4
LT		 717#ifdef CONFIG_CHR_DEV_SG
718 {
1da177e4
LT		 719 .procname = "sg-big-buff",
720 .data = &sg_big_buff,
721 .maxlen = sizeof (int),
722 .mode = 0444,
6d456111 723 .proc_handler = proc_dointvec,
1da177e4
LT		 724 },
725#endif
726#ifdef CONFIG_BSD_PROCESS_ACCT
727 {
1da177e4
LT		 728 .procname = "acct",
729 .data = &acct_parm,
730 .maxlen = 3*sizeof(int),
731 .mode = 0644,
6d456111 732 .proc_handler = proc_dointvec,
1da177e4
LT		 733 },
734#endif
1da177e4
LT		 735#ifdef CONFIG_MAGIC_SYSRQ
736 {
1da177e4 737 .procname = "sysrq",
eaee4172 738 .data = NULL,
1da177e4
LT		 739 .maxlen = sizeof (int),
740 .mode = 0644,
97f5f0cd 741 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 742 },
743#endif
d6f8ff73 744#ifdef CONFIG_PROC_SYSCTL
1da177e4 745 {
1da177e4 746 .procname = "cad_pid",
9ec52099 747 .data = NULL,
1da177e4
LT		 748 .maxlen = sizeof (int),
749 .mode = 0600,
6d456111 750 .proc_handler = proc_do_cad_pid,
1da177e4 751 },
d6f8ff73 752#endif
1da177e4 753 {
1da177e4 754 .procname = "threads-max",
16db3d3f 755 .data = NULL,
1da177e4
LT		 756 .maxlen = sizeof(int),
757 .mode = 0644,
16db3d3f 758 .proc_handler = sysctl_max_threads,
1da177e4
LT		 759 },
760 {
1da177e4
LT		 761 .procname = "random",
762 .mode = 0555,
763 .child = random_table,
764 },
17f60a7d
EP		 765 {
766 .procname = "usermodehelper",
767 .mode = 0555,
768 .child = usermodehelper_table,
769 },
ceb18132
LR		 770#ifdef CONFIG_FW_LOADER_USER_HELPER
771 {
772 .procname = "firmware_config",
773 .mode = 0555,
774 .child = firmware_config_table,
775 },
776#endif
1da177e4 777 {
1da177e4
LT		 778 .procname = "overflowuid",
779 .data = &overflowuid,
780 .maxlen = sizeof(int),
781 .mode = 0644,
6d456111 782 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 783 .extra1 = &minolduid,
784 .extra2 = &maxolduid,
785 },
786 {
1da177e4
LT		 787 .procname = "overflowgid",
788 .data = &overflowgid,
789 .maxlen = sizeof(int),
790 .mode = 0644,
6d456111 791 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 792 .extra1 = &minolduid,
793 .extra2 = &maxolduid,
794 },
347a8dc3 795#ifdef CONFIG_S390
1da177e4 796 {
1da177e4 797 .procname = "userprocess_debug",
ab3c68ee 798 .data = &show_unhandled_signals,
1da177e4
LT		 799 .maxlen = sizeof(int),
800 .mode = 0644,
6d456111 801 .proc_handler = proc_dointvec,
1da177e4
LT		 802 },
803#endif
804 {
1da177e4
LT		 805 .procname = "pid_max",
806 .data = &pid_max,
807 .maxlen = sizeof (int),
808 .mode = 0644,
6d456111 809 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 810 .extra1 = &pid_max_min,
811 .extra2 = &pid_max_max,
812 },
813 {
1da177e4
LT		 814 .procname = "panic_on_oops",
815 .data = &panic_on_oops,
816 .maxlen = sizeof(int),
817 .mode = 0644,
6d456111 818 .proc_handler = proc_dointvec,
1da177e4 819 },
81c9d43f
FT		 820 {
821 .procname = "panic_print",
822 .data = &panic_print,
823 .maxlen = sizeof(unsigned long),
824 .mode = 0644,
825 .proc_handler = proc_doulongvec_minmax,
826 },
7ef3d2fd
JP		 827#if defined CONFIG_PRINTK
828 {
7ef3d2fd
JP		 829 .procname = "printk",
830 .data = &console_loglevel,
831 .maxlen = 4*sizeof(int),
832 .mode = 0644,
6d456111 833 .proc_handler = proc_dointvec,
7ef3d2fd 834 },
1da177e4 835 {
1da177e4 836 .procname = "printk_ratelimit",
717115e1 837 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 838 .maxlen = sizeof(int),
839 .mode = 0644,
6d456111 840 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 841 },
842 {
1da177e4 843 .procname = "printk_ratelimit_burst",
717115e1 844 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 845 .maxlen = sizeof(int),
846 .mode = 0644,
6d456111 847 .proc_handler = proc_dointvec,
1da177e4 848 },
af91322e 849 {
af91322e
DY		 850 .procname = "printk_delay",
851 .data = &printk_delay_msec,
852 .maxlen = sizeof(int),
853 .mode = 0644,
6d456111 854 .proc_handler = proc_dointvec_minmax,
eec4844f 855 .extra1 = SYSCTL_ZERO,
af91322e
DY		 856 .extra2 = &ten_thousand,
857 },
750afe7b
BP		 858 {
859 .procname = "printk_devkmsg",
860 .data = devkmsg_log_str,
861 .maxlen = DEVKMSG_STR_MAX_SIZE,
862 .mode = 0644,
863 .proc_handler = devkmsg_sysctl_set_loglvl,
864 },
eaf06b24
DR		 865 {
866 .procname = "dmesg_restrict",
867 .data = &dmesg_restrict,
868 .maxlen = sizeof(int),
869 .mode = 0644,
620f6e8e 870 .proc_handler = proc_dointvec_minmax_sysadmin,
eec4844f
MC		 871 .extra1 = SYSCTL_ZERO,
872 .extra2 = SYSCTL_ONE,
eaf06b24 873 },
455cd5ab
DR		 874 {
875 .procname = "kptr_restrict",
876 .data = &kptr_restrict,
877 .maxlen = sizeof(int),
878 .mode = 0644,
620f6e8e 879 .proc_handler = proc_dointvec_minmax_sysadmin,
eec4844f 880 .extra1 = SYSCTL_ZERO,
455cd5ab
DR		 881 .extra2 = &two,
882 },
df6e61d4 883#endif
1da177e4 884 {
1da177e4
LT		 885 .procname = "ngroups_max",
886 .data = &ngroups_max,
887 .maxlen = sizeof (int),
888 .mode = 0444,
6d456111 889 .proc_handler = proc_dointvec,
1da177e4 890 },
73efc039
DB		 891 {
892 .procname = "cap_last_cap",
893 .data = (void *)&cap_last_cap,
894 .maxlen = sizeof(int),
895 .mode = 0444,
896 .proc_handler = proc_dointvec,
897 },
58687acb 898#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 899 {
58687acb 900 .procname = "watchdog",
7feeb9cd
TG		 901 .data = &watchdog_user_enabled,
902 .maxlen = sizeof(int),
903 .mode = 0644,
195daf66 904 .proc_handler = proc_watchdog,
eec4844f
MC		 905 .extra1 = SYSCTL_ZERO,
906 .extra2 = SYSCTL_ONE,
58687acb
DZ		 907 },
908 {
909 .procname = "watchdog_thresh",
586692a5 910 .data = &watchdog_thresh,
58687acb
DZ		 911 .maxlen = sizeof(int),
912 .mode = 0644,
195daf66 913 .proc_handler = proc_watchdog_thresh,
eec4844f 914 .extra1 = SYSCTL_ZERO,
58687acb 915 .extra2 = &sixty,
504d7cf1 916 },
195daf66
UO		 917 {
918 .procname = "nmi_watchdog",
7feeb9cd
TG		 919 .data = &nmi_watchdog_user_enabled,
920 .maxlen = sizeof(int),
51d4052b 921 .mode = NMI_WATCHDOG_SYSCTL_PERM,
195daf66 922 .proc_handler = proc_nmi_watchdog,
eec4844f
MC		 923 .extra1 = SYSCTL_ZERO,
924 .extra2 = SYSCTL_ONE,
195daf66 925 },
05a4a952
NP		 926 {
927 .procname = "watchdog_cpumask",
928 .data = &watchdog_cpumask_bits,
929 .maxlen = NR_CPUS,
930 .mode = 0644,
931 .proc_handler = proc_watchdog_cpumask,
932 },
933#ifdef CONFIG_SOFTLOCKUP_DETECTOR
195daf66
UO		 934 {
935 .procname = "soft_watchdog",
7feeb9cd
TG		 936 .data = &soft_watchdog_user_enabled,
937 .maxlen = sizeof(int),
938 .mode = 0644,
195daf66 939 .proc_handler = proc_soft_watchdog,
eec4844f
MC		 940 .extra1 = SYSCTL_ZERO,
941 .extra2 = SYSCTL_ONE,
195daf66 942 },
2508ce18
DZ		 943 {
944 .procname = "softlockup_panic",
945 .data = &softlockup_panic,
946 .maxlen = sizeof(int),
947 .mode = 0644,
948 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 949 .extra1 = SYSCTL_ZERO,
950 .extra2 = SYSCTL_ONE,
2508ce18 951 },
05a4a952 952#ifdef CONFIG_SMP
ac1f5912 953 {
05a4a952
NP		 954 .procname = "softlockup_all_cpu_backtrace",
955 .data = &sysctl_softlockup_all_cpu_backtrace,
ac1f5912
DZ		 956 .maxlen = sizeof(int),
957 .mode = 0644,
958 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 959 .extra1 = SYSCTL_ZERO,
960 .extra2 = SYSCTL_ONE,
ac1f5912 961 },
05a4a952 962#endif /* CONFIG_SMP */
ac1f5912 963#endif
05a4a952 964#ifdef CONFIG_HARDLOCKUP_DETECTOR
ed235875 965 {
05a4a952
NP		 966 .procname = "hardlockup_panic",
967 .data = &hardlockup_panic,
ed235875
AT		 968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 971 .extra1 = SYSCTL_ZERO,
972 .extra2 = SYSCTL_ONE,
ed235875 973 },
05a4a952 974#ifdef CONFIG_SMP
55537871
JK		 975 {
976 .procname = "hardlockup_all_cpu_backtrace",
977 .data = &sysctl_hardlockup_all_cpu_backtrace,
978 .maxlen = sizeof(int),
979 .mode = 0644,
980 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 981 .extra1 = SYSCTL_ZERO,
982 .extra2 = SYSCTL_ONE,
55537871 983 },
ed235875 984#endif /* CONFIG_SMP */
5dc30558 985#endif
05a4a952
NP		 986#endif
987
5dc30558
DZ		 988#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
989 {
990 .procname = "unknown_nmi_panic",
991 .data = &unknown_nmi_panic,
992 .maxlen = sizeof (int),
993 .mode = 0644,
994 .proc_handler = proc_dointvec,
995 },
504d7cf1 996#endif
1da177e4 997#if defined(CONFIG_X86)
8da5adda 998 {
8da5adda
DZ		 999 .procname = "panic_on_unrecovered_nmi",
1000 .data = &panic_on_unrecovered_nmi,
1001 .maxlen = sizeof(int),
1002 .mode = 0644,
6d456111 1003 .proc_handler = proc_dointvec,
8da5adda 1004 },
5211a242 1005 {
5211a242
KG		 1006 .procname = "panic_on_io_nmi",
1007 .data = &panic_on_io_nmi,
1008 .maxlen = sizeof(int),
1009 .mode = 0644,
6d456111 1010 .proc_handler = proc_dointvec,
5211a242 1011 },
55af7796
MH		 1012#ifdef CONFIG_DEBUG_STACKOVERFLOW
1013 {
1014 .procname = "panic_on_stackoverflow",
1015 .data = &sysctl_panic_on_stackoverflow,
1016 .maxlen = sizeof(int),
1017 .mode = 0644,
1018 .proc_handler = proc_dointvec,
1019 },
1020#endif
1da177e4 1021 {
1da177e4
LT		 1022 .procname = "bootloader_type",
1023 .data = &bootloader_type,
1024 .maxlen = sizeof (int),
1025 .mode = 0444,
6d456111 1026 .proc_handler = proc_dointvec,
1da177e4 1027 },
5031296c 1028 {
5031296c
PA		 1029 .procname = "bootloader_version",
1030 .data = &bootloader_version,
1031 .maxlen = sizeof (int),
1032 .mode = 0444,
6d456111 1033 .proc_handler = proc_dointvec,
5031296c 1034 },
6e7c4025 1035 {
6e7c4025
IM		 1036 .procname = "io_delay_type",
1037 .data = &io_delay_type,
1038 .maxlen = sizeof(int),
1039 .mode = 0644,
6d456111 1040 .proc_handler = proc_dointvec,
6e7c4025 1041 },
1da177e4 1042#endif
7a9166e3 1043#if defined(CONFIG_MMU)
1da177e4 1044 {
1da177e4
LT		 1045 .procname = "randomize_va_space",
1046 .data = &randomize_va_space,
1047 .maxlen = sizeof(int),
1048 .mode = 0644,
6d456111 1049 .proc_handler = proc_dointvec,
1da177e4 1050 },
7a9166e3 1051#endif
0152fb37 1052#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1053 {
951f22d5
MS		 1054 .procname = "spin_retry",
1055 .data = &spin_retry,
1056 .maxlen = sizeof (int),
1057 .mode = 0644,
6d456111 1058 .proc_handler = proc_dointvec,
951f22d5 1059 },
c255d844 1060#endif
673d5b43 1061#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1062 {
c255d844 1063 .procname = "acpi_video_flags",
77afcf78 1064 .data = &acpi_realmode_flags,
c255d844
PM		 1065 .maxlen = sizeof (unsigned long),
1066 .mode = 0644,
6d456111 1067 .proc_handler = proc_doulongvec_minmax,
c255d844 1068 },
d2b176ed 1069#endif
b6fca725 1070#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1071 {
d2b176ed
JS		 1072 .procname = "ignore-unaligned-usertrap",
1073 .data = &no_unaligned_warning,
1074 .maxlen = sizeof (int),
1075 .mode = 0644,
6d456111 1076 .proc_handler = proc_dointvec,
d2b176ed 1077 },
b6fca725
VG		 1078#endif
1079#ifdef CONFIG_IA64
88fc241f 1080 {
88fc241f
DC		 1081 .procname = "unaligned-dump-stack",
1082 .data = &unaligned_dump_stack,
1083 .maxlen = sizeof (int),
1084 .mode = 0644,
6d456111 1085 .proc_handler = proc_dointvec,
88fc241f 1086 },
bebfa101 1087#endif
e162b39a
MSB		 1088#ifdef CONFIG_DETECT_HUNG_TASK
1089 {
e162b39a
MSB		 1090 .procname = "hung_task_panic",
1091 .data = &sysctl_hung_task_panic,
1092 .maxlen = sizeof(int),
1093 .mode = 0644,
6d456111 1094 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1095 .extra1 = SYSCTL_ZERO,
1096 .extra2 = SYSCTL_ONE,
e162b39a 1097 },
82a1fcb9 1098 {
82a1fcb9
IM		 1099 .procname = "hung_task_check_count",
1100 .data = &sysctl_hung_task_check_count,
cd64647f 1101 .maxlen = sizeof(int),
82a1fcb9 1102 .mode = 0644,
cd64647f 1103 .proc_handler = proc_dointvec_minmax,
eec4844f 1104 .extra1 = SYSCTL_ZERO,
82a1fcb9
IM		 1105 },
1106 {
82a1fcb9
IM		 1107 .procname = "hung_task_timeout_secs",
1108 .data = &sysctl_hung_task_timeout_secs,
90739081 1109 .maxlen = sizeof(unsigned long),
82a1fcb9 1110 .mode = 0644,
6d456111 1111 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1112 .extra2 = &hung_task_timeout_max,
82a1fcb9 1113 },
a2e51445
DV		 1114 {
1115 .procname = "hung_task_check_interval_secs",
1116 .data = &sysctl_hung_task_check_interval_secs,
1117 .maxlen = sizeof(unsigned long),
1118 .mode = 0644,
1119 .proc_handler = proc_dohung_task_timeout_secs,
1120 .extra2 = &hung_task_timeout_max,
1121 },
82a1fcb9 1122 {
82a1fcb9
IM		 1123 .procname = "hung_task_warnings",
1124 .data = &sysctl_hung_task_warnings,
270750db 1125 .maxlen = sizeof(int),
82a1fcb9 1126 .mode = 0644,
270750db
AT		 1127 .proc_handler = proc_dointvec_minmax,
1128 .extra1 = &neg_one,
82a1fcb9 1129 },
c4f3b63f 1130#endif
23f78d4a
IM		 1131#ifdef CONFIG_RT_MUTEXES
1132 {
23f78d4a
IM		 1133 .procname = "max_lock_depth",
1134 .data = &max_lock_depth,
1135 .maxlen = sizeof(int),
1136 .mode = 0644,
6d456111 1137 .proc_handler = proc_dointvec,
23f78d4a 1138 },
5096add8 1139#endif
10a0a8d4 1140 {
10a0a8d4
JF		 1141 .procname = "poweroff_cmd",
1142 .data = &poweroff_cmd,
1143 .maxlen = POWEROFF_CMD_PATH_LEN,
1144 .mode = 0644,
6d456111 1145 .proc_handler = proc_dostring,
10a0a8d4 1146 },
0b77f5bf
DH		 1147#ifdef CONFIG_KEYS
1148 {
0b77f5bf
DH		 1149 .procname = "keys",
1150 .mode = 0555,
1151 .child = key_sysctls,
1152 },
1153#endif
cdd6c482 1154#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1155 /*
1156 * User-space scripts rely on the existence of this file
1157 * as a feature check for perf_events being enabled.
1158 *
1159 * So it's an ABI, do not remove!
1160 */
1ccd1549 1161 {
cdd6c482
IM		 1162 .procname = "perf_event_paranoid",
1163 .data = &sysctl_perf_event_paranoid,
1164 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1165 .mode = 0644,
6d456111 1166 .proc_handler = proc_dointvec,
1ccd1549 1167 },
c5078f78 1168 {
cdd6c482
IM		 1169 .procname = "perf_event_mlock_kb",
1170 .data = &sysctl_perf_event_mlock,
1171 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1172 .mode = 0644,
6d456111 1173 .proc_handler = proc_dointvec,
c5078f78 1174 },
a78ac325 1175 {
cdd6c482
IM		 1176 .procname = "perf_event_max_sample_rate",
1177 .data = &sysctl_perf_event_sample_rate,
1178 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1179 .mode = 0644,
163ec435 1180 .proc_handler = perf_proc_update_handler,
eec4844f 1181 .extra1 = SYSCTL_ONE,
a78ac325 1182 },
14c63f17
DH		 1183 {
1184 .procname = "perf_cpu_time_max_percent",
1185 .data = &sysctl_perf_cpu_time_max_percent,
1186 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1187 .mode = 0644,
1188 .proc_handler = perf_cpu_time_max_percent_handler,
eec4844f 1189 .extra1 = SYSCTL_ZERO,
14c63f17
DH		 1190 .extra2 = &one_hundred,
1191 },
c5dfd78e
ACM		 1192 {
1193 .procname = "perf_event_max_stack",
a831100a 1194 .data = &sysctl_perf_event_max_stack,
c5dfd78e
ACM		 1195 .maxlen = sizeof(sysctl_perf_event_max_stack),
1196 .mode = 0644,
1197 .proc_handler = perf_event_max_stack_handler,
eec4844f 1198 .extra1 = SYSCTL_ZERO,
c5dfd78e
ACM		 1199 .extra2 = &six_hundred_forty_kb,
1200 },
c85b0334
ACM		 1201 {
1202 .procname = "perf_event_max_contexts_per_stack",
1203 .data = &sysctl_perf_event_max_contexts_per_stack,
1204 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1205 .mode = 0644,
1206 .proc_handler = perf_event_max_stack_handler,
eec4844f 1207 .extra1 = SYSCTL_ZERO,
c85b0334
ACM		 1208 .extra2 = &one_thousand,
1209 },
cb684b5b 1210#endif
9e3961a0
PB		 1211 {
1212 .procname = "panic_on_warn",
1213 .data = &panic_on_warn,
1214 .maxlen = sizeof(int),
1215 .mode = 0644,
1216 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1217 .extra1 = SYSCTL_ZERO,
1218 .extra2 = SYSCTL_ONE,
9e3961a0 1219 },
bc7a34b8
TG		 1220#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1221 {
1222 .procname = "timer_migration",
1223 .data = &sysctl_timer_migration,
1224 .maxlen = sizeof(unsigned int),
1225 .mode = 0644,
1226 .proc_handler = timer_migration_handler,
eec4844f
MC		 1227 .extra1 = SYSCTL_ZERO,
1228 .extra2 = SYSCTL_ONE,
bc7a34b8 1229 },
1be7f75d
AS		 1230#endif
1231#ifdef CONFIG_BPF_SYSCALL
1232 {
1233 .procname = "unprivileged_bpf_disabled",
1234 .data = &sysctl_unprivileged_bpf_disabled,
1235 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1236 .mode = 0644,
1237 /* only handle a transition from default "0" to "1" */
1238 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1239 .extra1 = SYSCTL_ONE,
1240 .extra2 = SYSCTL_ONE,
1be7f75d 1241 },
492ecee8
AS		 1242 {
1243 .procname = "bpf_stats_enabled",
a8e11e5c
ED		 1244 .data = &bpf_stats_enabled_key.key,
1245 .maxlen = sizeof(bpf_stats_enabled_key),
492ecee8 1246 .mode = 0644,
a8e11e5c 1247 .proc_handler = proc_do_static_key,
492ecee8 1248 },
3fcc5530 1249#endif
b3e627d3 1250#if defined(CONFIG_TREE_RCU)
088e9d25
DBO		 1251 {
1252 .procname = "panic_on_rcu_stall",
1253 .data = &sysctl_panic_on_rcu_stall,
1254 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1255 .mode = 0644,
1256 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1257 .extra1 = SYSCTL_ZERO,
1258 .extra2 = SYSCTL_ONE,
088e9d25 1259 },
964c9dff
AP		 1260#endif
1261#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1262 {
1263 .procname = "stack_erasing",
1264 .data = NULL,
1265 .maxlen = sizeof(int),
1266 .mode = 0600,
1267 .proc_handler = stack_erasing_sysctl,
eec4844f
MC		 1268 .extra1 = SYSCTL_ZERO,
1269 .extra2 = SYSCTL_ONE,
964c9dff 1270 },
bc7a34b8 1271#endif
6fce56ec 1272 { }
1da177e4
LT		 1273};
1274
d8217f07 1275static struct ctl_table vm_table[] = {
1da177e4 1276 {
1da177e4
LT		 1277 .procname = "overcommit_memory",
1278 .data = &sysctl_overcommit_memory,
1279 .maxlen = sizeof(sysctl_overcommit_memory),
1280 .mode = 0644,
cb16e95f 1281 .proc_handler = proc_dointvec_minmax,
eec4844f 1282 .extra1 = SYSCTL_ZERO,
cb16e95f 1283 .extra2 = &two,
1da177e4 1284 },
fadd8fbd 1285 {
fadd8fbd
KH		 1286 .procname = "panic_on_oom",
1287 .data = &sysctl_panic_on_oom,
1288 .maxlen = sizeof(sysctl_panic_on_oom),
1289 .mode = 0644,
cb16e95f 1290 .proc_handler = proc_dointvec_minmax,
eec4844f 1291 .extra1 = SYSCTL_ZERO,
cb16e95f 1292 .extra2 = &two,
fadd8fbd 1293 },
fe071d7e 1294 {
fe071d7e
DR		 1295 .procname = "oom_kill_allocating_task",
1296 .data = &sysctl_oom_kill_allocating_task,
1297 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1298 .mode = 0644,
6d456111 1299 .proc_handler = proc_dointvec,
fe071d7e 1300 },
fef1bdd6 1301 {
fef1bdd6
DR		 1302 .procname = "oom_dump_tasks",
1303 .data = &sysctl_oom_dump_tasks,
1304 .maxlen = sizeof(sysctl_oom_dump_tasks),
1305 .mode = 0644,
6d456111 1306 .proc_handler = proc_dointvec,
fef1bdd6 1307 },
1da177e4 1308 {
1da177e4
LT		 1309 .procname = "overcommit_ratio",
1310 .data = &sysctl_overcommit_ratio,
1311 .maxlen = sizeof(sysctl_overcommit_ratio),
1312 .mode = 0644,
49f0ce5f
JM		 1313 .proc_handler = overcommit_ratio_handler,
1314 },
1315 {
1316 .procname = "overcommit_kbytes",
1317 .data = &sysctl_overcommit_kbytes,
1318 .maxlen = sizeof(sysctl_overcommit_kbytes),
1319 .mode = 0644,
1320 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1321 },
1322 {
1da177e4
LT		 1323 .procname = "page-cluster",
1324 .data = &page_cluster,
1325 .maxlen = sizeof(int),
1326 .mode = 0644,
cb16e95f 1327 .proc_handler = proc_dointvec_minmax,
eec4844f 1328 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1329 },
1330 {
1da177e4
LT		 1331 .procname = "dirty_background_ratio",
1332 .data = &dirty_background_ratio,
1333 .maxlen = sizeof(dirty_background_ratio),
1334 .mode = 0644,
6d456111 1335 .proc_handler = dirty_background_ratio_handler,
eec4844f 1336 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1337 .extra2 = &one_hundred,
1338 },
2da02997 1339 {
2da02997
DR		 1340 .procname = "dirty_background_bytes",
1341 .data = &dirty_background_bytes,
1342 .maxlen = sizeof(dirty_background_bytes),
1343 .mode = 0644,
6d456111 1344 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1345 .extra1 = &one_ul,
2da02997 1346 },
1da177e4 1347 {
1da177e4
LT		 1348 .procname = "dirty_ratio",
1349 .data = &vm_dirty_ratio,
1350 .maxlen = sizeof(vm_dirty_ratio),
1351 .mode = 0644,
6d456111 1352 .proc_handler = dirty_ratio_handler,
eec4844f 1353 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1354 .extra2 = &one_hundred,
1355 },
2da02997 1356 {
2da02997
DR		 1357 .procname = "dirty_bytes",
1358 .data = &vm_dirty_bytes,
1359 .maxlen = sizeof(vm_dirty_bytes),
1360 .mode = 0644,
6d456111 1361 .proc_handler = dirty_bytes_handler,
9e4a5bda 1362 .extra1 = &dirty_bytes_min,
2da02997 1363 },
1da177e4 1364 {
1da177e4 1365 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1366 .data = &dirty_writeback_interval,
1367 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1368 .mode = 0644,
6d456111 1369 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1370 },
1371 {
1da177e4 1372 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1373 .data = &dirty_expire_interval,
1374 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1375 .mode = 0644,
cb16e95f 1376 .proc_handler = proc_dointvec_minmax,
eec4844f 1377 .extra1 = SYSCTL_ZERO,
1da177e4 1378 },
1efff914
TT		 1379 {
1380 .procname = "dirtytime_expire_seconds",
1381 .data = &dirtytime_expire_interval,
2d87b309 1382 .maxlen = sizeof(dirtytime_expire_interval),
1efff914
TT		 1383 .mode = 0644,
1384 .proc_handler = dirtytime_interval_handler,
eec4844f 1385 .extra1 = SYSCTL_ZERO,
1efff914 1386 },
1da177e4 1387 {
1da177e4
LT		 1388 .procname = "swappiness",
1389 .data = &vm_swappiness,
1390 .maxlen = sizeof(vm_swappiness),
1391 .mode = 0644,
6d456111 1392 .proc_handler = proc_dointvec_minmax,
eec4844f 1393 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1394 .extra2 = &one_hundred,
1395 },
1396#ifdef CONFIG_HUGETLB_PAGE
06808b08 1397 {
1da177e4 1398 .procname = "nr_hugepages",
e5ff2159 1399 .data = NULL,
1da177e4
LT		 1400 .maxlen = sizeof(unsigned long),
1401 .mode = 0644,
6d456111 1402 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1403 },
1404#ifdef CONFIG_NUMA
1405 {
1406 .procname = "nr_hugepages_mempolicy",
1407 .data = NULL,
1408 .maxlen = sizeof(unsigned long),
1409 .mode = 0644,
1410 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08 1411 },
4518085e
KW		 1412 {
1413 .procname = "numa_stat",
1414 .data = &sysctl_vm_numa_stat,
1415 .maxlen = sizeof(int),
1416 .mode = 0644,
1417 .proc_handler = sysctl_vm_numa_stat_handler,
eec4844f
MC		 1418 .extra1 = SYSCTL_ZERO,
1419 .extra2 = SYSCTL_ONE,
4518085e 1420 },
06808b08 1421#endif
1da177e4 1422 {
1da177e4
LT		 1423 .procname = "hugetlb_shm_group",
1424 .data = &sysctl_hugetlb_shm_group,
1425 .maxlen = sizeof(gid_t),
1426 .mode = 0644,
6d456111 1427 .proc_handler = proc_dointvec,
1da177e4 1428 },
d1c3fb1f 1429 {
d1c3fb1f 1430 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1431 .data = NULL,
1432 .maxlen = sizeof(unsigned long),
d1c3fb1f 1433 .mode = 0644,
6d456111 1434 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1435 },
1da177e4
LT		 1436#endif
1437 {
1da177e4
LT		 1438 .procname = "lowmem_reserve_ratio",
1439 .data = &sysctl_lowmem_reserve_ratio,
1440 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1441 .mode = 0644,
6d456111 1442 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1443 },
9d0243bc 1444 {
9d0243bc
AM		 1445 .procname = "drop_caches",
1446 .data = &sysctl_drop_caches,
1447 .maxlen = sizeof(int),
204cb79a 1448 .mode = 0200,
9d0243bc 1449 .proc_handler = drop_caches_sysctl_handler,
eec4844f 1450 .extra1 = SYSCTL_ONE,
5509a5d2 1451 .extra2 = &four,
9d0243bc 1452 },
76ab0f53
MG		 1453#ifdef CONFIG_COMPACTION
1454 {
1455 .procname = "compact_memory",
1456 .data = &sysctl_compact_memory,
1457 .maxlen = sizeof(int),
1458 .mode = 0200,
1459 .proc_handler = sysctl_compaction_handler,
1460 },
5e771905
MG		 1461 {
1462 .procname = "extfrag_threshold",
1463 .data = &sysctl_extfrag_threshold,
1464 .maxlen = sizeof(int),
1465 .mode = 0644,
6b7e5cad 1466 .proc_handler = proc_dointvec_minmax,
5e771905
MG		 1467 .extra1 = &min_extfrag_threshold,
1468 .extra2 = &max_extfrag_threshold,
1469 },
5bbe3547
EM		 1470 {
1471 .procname = "compact_unevictable_allowed",
1472 .data = &sysctl_compact_unevictable_allowed,
1473 .maxlen = sizeof(int),
1474 .mode = 0644,
6923aa0d 1475 .proc_handler = proc_dointvec_minmax_warn_RT_change,
eec4844f
MC		 1476 .extra1 = SYSCTL_ZERO,
1477 .extra2 = SYSCTL_ONE,
5bbe3547 1478 },
5e771905 1479
76ab0f53 1480#endif /* CONFIG_COMPACTION */
1da177e4 1481 {
1da177e4
LT		 1482 .procname = "min_free_kbytes",
1483 .data = &min_free_kbytes,
1484 .maxlen = sizeof(min_free_kbytes),
1485 .mode = 0644,
6d456111 1486 .proc_handler = min_free_kbytes_sysctl_handler,
eec4844f 1487 .extra1 = SYSCTL_ZERO,
1da177e4 1488 },
1c30844d
MG		 1489 {
1490 .procname = "watermark_boost_factor",
1491 .data = &watermark_boost_factor,
1492 .maxlen = sizeof(watermark_boost_factor),
1493 .mode = 0644,
1494 .proc_handler = watermark_boost_factor_sysctl_handler,
eec4844f 1495 .extra1 = SYSCTL_ZERO,
1c30844d 1496 },
795ae7a0
JW		 1497 {
1498 .procname = "watermark_scale_factor",
1499 .data = &watermark_scale_factor,
1500 .maxlen = sizeof(watermark_scale_factor),
1501 .mode = 0644,
1502 .proc_handler = watermark_scale_factor_sysctl_handler,
eec4844f 1503 .extra1 = SYSCTL_ONE,
795ae7a0
JW		 1504 .extra2 = &one_thousand,
1505 },
8ad4b1fb 1506 {
8ad4b1fb
RS		 1507 .procname = "percpu_pagelist_fraction",
1508 .data = &percpu_pagelist_fraction,
1509 .maxlen = sizeof(percpu_pagelist_fraction),
1510 .mode = 0644,
6d456111 1511 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
eec4844f 1512 .extra1 = SYSCTL_ZERO,
8ad4b1fb 1513 },
1da177e4
LT		 1514#ifdef CONFIG_MMU
1515 {
1da177e4
LT		 1516 .procname = "max_map_count",
1517 .data = &sysctl_max_map_count,
1518 .maxlen = sizeof(sysctl_max_map_count),
1519 .mode = 0644,
3e26120c 1520 .proc_handler = proc_dointvec_minmax,
eec4844f 1521 .extra1 = SYSCTL_ZERO,
1da177e4 1522 },
dd8632a1
PM		 1523#else
1524 {
dd8632a1
PM		 1525 .procname = "nr_trim_pages",
1526 .data = &sysctl_nr_trim_pages,
1527 .maxlen = sizeof(sysctl_nr_trim_pages),
1528 .mode = 0644,
6d456111 1529 .proc_handler = proc_dointvec_minmax,
eec4844f 1530 .extra1 = SYSCTL_ZERO,
dd8632a1 1531 },
1da177e4
LT		 1532#endif
1533 {
1da177e4
LT		 1534 .procname = "laptop_mode",
1535 .data = &laptop_mode,
1536 .maxlen = sizeof(laptop_mode),
1537 .mode = 0644,
6d456111 1538 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1539 },
1540 {
1da177e4
LT		 1541 .procname = "block_dump",
1542 .data = &block_dump,
1543 .maxlen = sizeof(block_dump),
1544 .mode = 0644,
6d456111 1545 .proc_handler = proc_dointvec,
eec4844f 1546 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1547 },
1548 {
1da177e4
LT		 1549 .procname = "vfs_cache_pressure",
1550 .data = &sysctl_vfs_cache_pressure,
1551 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1552 .mode = 0644,
6d456111 1553 .proc_handler = proc_dointvec,
eec4844f 1554 .extra1 = SYSCTL_ZERO,
1da177e4 1555 },
67f3977f
AG		 1556#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
1557 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
1da177e4 1558 {
1da177e4
LT		 1559 .procname = "legacy_va_layout",
1560 .data = &sysctl_legacy_va_layout,
1561 .maxlen = sizeof(sysctl_legacy_va_layout),
1562 .mode = 0644,
6d456111 1563 .proc_handler = proc_dointvec,
eec4844f 1564 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1565 },
1566#endif
1743660b
CL		 1567#ifdef CONFIG_NUMA
1568 {
1743660b 1569 .procname = "zone_reclaim_mode",
a5f5f91d
MG		 1570 .data = &node_reclaim_mode,
1571 .maxlen = sizeof(node_reclaim_mode),
1743660b 1572 .mode = 0644,
6d456111 1573 .proc_handler = proc_dointvec,
eec4844f 1574 .extra1 = SYSCTL_ZERO,
1743660b 1575 },
9614634f 1576 {
9614634f
CL		 1577 .procname = "min_unmapped_ratio",
1578 .data = &sysctl_min_unmapped_ratio,
1579 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1580 .mode = 0644,
6d456111 1581 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
eec4844f 1582 .extra1 = SYSCTL_ZERO,
9614634f
CL		 1583 .extra2 = &one_hundred,
1584 },
0ff38490 1585 {
0ff38490
CL		 1586 .procname = "min_slab_ratio",
1587 .data = &sysctl_min_slab_ratio,
1588 .maxlen = sizeof(sysctl_min_slab_ratio),
1589 .mode = 0644,
6d456111 1590 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
eec4844f 1591 .extra1 = SYSCTL_ZERO,
0ff38490
CL		 1592 .extra2 = &one_hundred,
1593 },
e6e5494c 1594#endif
77461ab3
CL		 1595#ifdef CONFIG_SMP
1596 {
77461ab3
CL		 1597 .procname = "stat_interval",
1598 .data = &sysctl_stat_interval,
1599 .maxlen = sizeof(sysctl_stat_interval),
1600 .mode = 0644,
6d456111 1601 .proc_handler = proc_dointvec_jiffies,
77461ab3 1602 },
52b6f46b
HD		 1603 {
1604 .procname = "stat_refresh",
1605 .data = NULL,
1606 .maxlen = 0,
1607 .mode = 0600,
1608 .proc_handler = vmstat_refresh,
1609 },
77461ab3 1610#endif
6e141546 1611#ifdef CONFIG_MMU
ed032189 1612 {
ed032189 1613 .procname = "mmap_min_addr",
788084ab
EP		 1614 .data = &dac_mmap_min_addr,
1615 .maxlen = sizeof(unsigned long),
ed032189 1616 .mode = 0644,
6d456111 1617 .proc_handler = mmap_min_addr_handler,
ed032189 1618 },
6e141546 1619#endif
f0c0b2b8
KH		 1620#ifdef CONFIG_NUMA
1621 {
f0c0b2b8
KH		 1622 .procname = "numa_zonelist_order",
1623 .data = &numa_zonelist_order,
1624 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1625 .mode = 0644,
6d456111 1626 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1627 },
1628#endif
2b8232ce 1629#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1630 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1631 {
e6e5494c 1632 .procname = "vdso_enabled",
3d7ee969
AL		 1633#ifdef CONFIG_X86_32
1634 .data = &vdso32_enabled,
1635 .maxlen = sizeof(vdso32_enabled),
1636#else
e6e5494c
IM		 1637 .data = &vdso_enabled,
1638 .maxlen = sizeof(vdso_enabled),
3d7ee969 1639#endif
e6e5494c 1640 .mode = 0644,
6d456111 1641 .proc_handler = proc_dointvec,
eec4844f 1642 .extra1 = SYSCTL_ZERO,
e6e5494c 1643 },
1da177e4 1644#endif
195cf453
BG		 1645#ifdef CONFIG_HIGHMEM
1646 {
195cf453
BG		 1647 .procname = "highmem_is_dirtyable",
1648 .data = &vm_highmem_is_dirtyable,
1649 .maxlen = sizeof(vm_highmem_is_dirtyable),
1650 .mode = 0644,
6d456111 1651 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1652 .extra1 = SYSCTL_ZERO,
1653 .extra2 = SYSCTL_ONE,
195cf453
BG		 1654 },
1655#endif
6a46079c
AK		 1656#ifdef CONFIG_MEMORY_FAILURE
1657 {
6a46079c
AK		 1658 .procname = "memory_failure_early_kill",
1659 .data = &sysctl_memory_failure_early_kill,
1660 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1661 .mode = 0644,
6d456111 1662 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1663 .extra1 = SYSCTL_ZERO,
1664 .extra2 = SYSCTL_ONE,
6a46079c
AK		 1665 },
1666 {
6a46079c
AK		 1667 .procname = "memory_failure_recovery",
1668 .data = &sysctl_memory_failure_recovery,
1669 .maxlen = sizeof(sysctl_memory_failure_recovery),
1670 .mode = 0644,
6d456111 1671 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1672 .extra1 = SYSCTL_ZERO,
1673 .extra2 = SYSCTL_ONE,
6a46079c
AK		 1674 },
1675#endif
c9b1d098
AS		 1676 {
1677 .procname = "user_reserve_kbytes",
1678 .data = &sysctl_user_reserve_kbytes,
1679 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1680 .mode = 0644,
1681 .proc_handler = proc_doulongvec_minmax,
1682 },
4eeab4f5
AS		 1683 {
1684 .procname = "admin_reserve_kbytes",
1685 .data = &sysctl_admin_reserve_kbytes,
1686 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1687 .mode = 0644,
1688 .proc_handler = proc_doulongvec_minmax,
1689 },
d07e2259
DC		 1690#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1691 {
1692 .procname = "mmap_rnd_bits",
1693 .data = &mmap_rnd_bits,
1694 .maxlen = sizeof(mmap_rnd_bits),
1695 .mode = 0600,
1696 .proc_handler = proc_dointvec_minmax,
1697 .extra1 = (void *)&mmap_rnd_bits_min,
1698 .extra2 = (void *)&mmap_rnd_bits_max,
1699 },
1700#endif
1701#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1702 {
1703 .procname = "mmap_rnd_compat_bits",
1704 .data = &mmap_rnd_compat_bits,
1705 .maxlen = sizeof(mmap_rnd_compat_bits),
1706 .mode = 0600,
1707 .proc_handler = proc_dointvec_minmax,
1708 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1709 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1710 },
cefdca0a
PX		 1711#endif
1712#ifdef CONFIG_USERFAULTFD
1713 {
1714 .procname = "unprivileged_userfaultfd",
1715 .data = &sysctl_unprivileged_userfaultfd,
1716 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
1717 .mode = 0644,
1718 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1719 .extra1 = SYSCTL_ZERO,
1720 .extra2 = SYSCTL_ONE,
cefdca0a 1721 },
d07e2259 1722#endif
6fce56ec 1723 { }
1da177e4
LT		 1724};
1725
d8217f07 1726static struct ctl_table fs_table[] = {
1da177e4 1727 {
1da177e4
LT		 1728 .procname = "inode-nr",
1729 .data = &inodes_stat,
3942c07c 1730 .maxlen = 2*sizeof(long),
1da177e4 1731 .mode = 0444,
cffbc8aa 1732 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1733 },
1734 {
1da177e4
LT		 1735 .procname = "inode-state",
1736 .data = &inodes_stat,
3942c07c 1737 .maxlen = 7*sizeof(long),
1da177e4 1738 .mode = 0444,
cffbc8aa 1739 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1740 },
1741 {
1da177e4
LT		 1742 .procname = "file-nr",
1743 .data = &files_stat,
518de9b3 1744 .maxlen = sizeof(files_stat),
1da177e4 1745 .mode = 0444,
6d456111 1746 .proc_handler = proc_nr_files,
1da177e4
LT		 1747 },
1748 {
1da177e4
LT		 1749 .procname = "file-max",
1750 .data = &files_stat.max_files,
518de9b3 1751 .maxlen = sizeof(files_stat.max_files),
1da177e4 1752 .mode = 0644,
518de9b3 1753 .proc_handler = proc_doulongvec_minmax,
9002b214 1754 .extra1 = &zero_ul,
32a5ad9c 1755 .extra2 = &long_max,
1da177e4 1756 },
9cfe015a 1757 {
9cfe015a
ED		 1758 .procname = "nr_open",
1759 .data = &sysctl_nr_open,
9b80a184 1760 .maxlen = sizeof(unsigned int),
9cfe015a 1761 .mode = 0644,
6d456111 1762 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1763 .extra1 = &sysctl_nr_open_min,
1764 .extra2 = &sysctl_nr_open_max,
9cfe015a 1765 },
1da177e4 1766 {
1da177e4
LT		 1767 .procname = "dentry-state",
1768 .data = &dentry_stat,
3942c07c 1769 .maxlen = 6*sizeof(long),
1da177e4 1770 .mode = 0444,
312d3ca8 1771 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1772 },
1773 {
1da177e4
LT		 1774 .procname = "overflowuid",
1775 .data = &fs_overflowuid,
1776 .maxlen = sizeof(int),
1777 .mode = 0644,
6d456111 1778 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1779 .extra1 = &minolduid,
1780 .extra2 = &maxolduid,
1781 },
1782 {
1da177e4
LT		 1783 .procname = "overflowgid",
1784 .data = &fs_overflowgid,
1785 .maxlen = sizeof(int),
1786 .mode = 0644,
6d456111 1787 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1788 .extra1 = &minolduid,
1789 .extra2 = &maxolduid,
1790 },
bfcd17a6 1791#ifdef CONFIG_FILE_LOCKING
1da177e4 1792 {
1da177e4
LT		 1793 .procname = "leases-enable",
1794 .data = &leases_enable,
1795 .maxlen = sizeof(int),
1796 .mode = 0644,
6d456111 1797 .proc_handler = proc_dointvec,
1da177e4 1798 },
bfcd17a6 1799#endif
1da177e4
LT		 1800#ifdef CONFIG_DNOTIFY
1801 {
1da177e4
LT		 1802 .procname = "dir-notify-enable",
1803 .data = &dir_notify_enable,
1804 .maxlen = sizeof(int),
1805 .mode = 0644,
6d456111 1806 .proc_handler = proc_dointvec,
1da177e4
LT		 1807 },
1808#endif
1809#ifdef CONFIG_MMU
bfcd17a6 1810#ifdef CONFIG_FILE_LOCKING
1da177e4 1811 {
1da177e4
LT		 1812 .procname = "lease-break-time",
1813 .data = &lease_break_time,
1814 .maxlen = sizeof(int),
1815 .mode = 0644,
6d456111 1816 .proc_handler = proc_dointvec,
1da177e4 1817 },
bfcd17a6 1818#endif
ebf3f09c 1819#ifdef CONFIG_AIO
1da177e4 1820 {
1da177e4
LT		 1821 .procname = "aio-nr",
1822 .data = &aio_nr,
1823 .maxlen = sizeof(aio_nr),
1824 .mode = 0444,
6d456111 1825 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1826 },
1827 {
1da177e4
LT		 1828 .procname = "aio-max-nr",
1829 .data = &aio_max_nr,
1830 .maxlen = sizeof(aio_max_nr),
1831 .mode = 0644,
6d456111 1832 .proc_handler = proc_doulongvec_minmax,
1da177e4 1833 },
ebf3f09c 1834#endif /* CONFIG_AIO */
2d9048e2 1835#ifdef CONFIG_INOTIFY_USER
0399cb08 1836 {
0399cb08
RL		 1837 .procname = "inotify",
1838 .mode = 0555,
1839 .child = inotify_table,
1840 },
1841#endif
7ef9964e
DL		 1842#ifdef CONFIG_EPOLL
1843 {
1844 .procname = "epoll",
1845 .mode = 0555,
1846 .child = epoll_table,
1847 },
1848#endif
1da177e4 1849#endif
800179c9
KC		 1850 {
1851 .procname = "protected_symlinks",
1852 .data = &sysctl_protected_symlinks,
1853 .maxlen = sizeof(int),
1854 .mode = 0600,
1855 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1856 .extra1 = SYSCTL_ZERO,
1857 .extra2 = SYSCTL_ONE,
800179c9
KC		 1858 },
1859 {
1860 .procname = "protected_hardlinks",
1861 .data = &sysctl_protected_hardlinks,
1862 .maxlen = sizeof(int),
1863 .mode = 0600,
1864 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1865 .extra1 = SYSCTL_ZERO,
1866 .extra2 = SYSCTL_ONE,
800179c9 1867 },
30aba665
SM		 1868 {
1869 .procname = "protected_fifos",
1870 .data = &sysctl_protected_fifos,
1871 .maxlen = sizeof(int),
1872 .mode = 0600,
1873 .proc_handler = proc_dointvec_minmax,
eec4844f 1874 .extra1 = SYSCTL_ZERO,
30aba665
SM		 1875 .extra2 = &two,
1876 },
1877 {
1878 .procname = "protected_regular",
1879 .data = &sysctl_protected_regular,
1880 .maxlen = sizeof(int),
1881 .mode = 0600,
1882 .proc_handler = proc_dointvec_minmax,
eec4844f 1883 .extra1 = SYSCTL_ZERO,
30aba665
SM		 1884 .extra2 = &two,
1885 },
d6e71144 1886 {
d6e71144
AC		 1887 .procname = "suid_dumpable",
1888 .data = &suid_dumpable,
1889 .maxlen = sizeof(int),
1890 .mode = 0644,
54b50199 1891 .proc_handler = proc_dointvec_minmax_coredump,
eec4844f 1892 .extra1 = SYSCTL_ZERO,
8e654fba 1893 .extra2 = &two,
d6e71144 1894 },
2abc26fc
EB		 1895#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1896 {
2abc26fc
EB		 1897 .procname = "binfmt_misc",
1898 .mode = 0555,
f9bd6733 1899 .child = sysctl_mount_point,
2abc26fc
EB		 1900 },
1901#endif
b492e95b 1902 {
ff9da691
JA		 1903 .procname = "pipe-max-size",
1904 .data = &pipe_max_size,
98159d97 1905 .maxlen = sizeof(pipe_max_size),
b492e95b 1906 .mode = 0644,
319e0a21 1907 .proc_handler = proc_dopipe_max_size,
b492e95b 1908 },
759c0114
WT		 1909 {
1910 .procname = "pipe-user-pages-hard",
1911 .data = &pipe_user_pages_hard,
1912 .maxlen = sizeof(pipe_user_pages_hard),
1913 .mode = 0644,
1914 .proc_handler = proc_doulongvec_minmax,
1915 },
1916 {
1917 .procname = "pipe-user-pages-soft",
1918 .data = &pipe_user_pages_soft,
1919 .maxlen = sizeof(pipe_user_pages_soft),
1920 .mode = 0644,
1921 .proc_handler = proc_doulongvec_minmax,
1922 },
d2921684
EB		 1923 {
1924 .procname = "mount-max",
1925 .data = &sysctl_mount_max,
1926 .maxlen = sizeof(unsigned int),
1927 .mode = 0644,
1928 .proc_handler = proc_dointvec_minmax,
eec4844f 1929 .extra1 = SYSCTL_ONE,
d2921684 1930 },
6fce56ec 1931 { }
1da177e4
LT		 1932};
1933
d8217f07 1934static struct ctl_table debug_table[] = {
7ac57a89 1935#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1936 {
abd4f750
MAS		 1937 .procname = "exception-trace",
1938 .data = &show_unhandled_signals,
1939 .maxlen = sizeof(int),
1940 .mode = 0644,
1941 .proc_handler = proc_dointvec
1942 },
b2be84df
MH		 1943#endif
1944#if defined(CONFIG_OPTPROBES)
1945 {
1946 .procname = "kprobes-optimization",
1947 .data = &sysctl_kprobes_optimization,
1948 .maxlen = sizeof(int),
1949 .mode = 0644,
1950 .proc_handler = proc_kprobes_optimization_handler,
eec4844f
MC		 1951 .extra1 = SYSCTL_ZERO,
1952 .extra2 = SYSCTL_ONE,
b2be84df 1953 },
abd4f750 1954#endif
6fce56ec 1955 { }
1da177e4
LT		 1956};
1957
d8217f07 1958static struct ctl_table dev_table[] = {
6fce56ec 1959 { }
0eeca283 1960};
1da177e4 1961
de4e83bd 1962int __init sysctl_init(void)
d912b0cc 1963{
fd4b616b
SR		 1964 struct ctl_table_header *hdr;
1965
1966 hdr = register_sysctl_table(sysctl_base_table);
1967 kmemleak_not_leak(hdr);
d912b0cc
EB		 1968 return 0;
1969}
1970
b89a8171
EB		 1971#endif /* CONFIG_SYSCTL */
1972
1da177e4
LT		 1973/*
1974 * /proc/sys support
1975 */
1976
b89a8171 1977#ifdef CONFIG_PROC_SYSCTL
1da177e4 1978
f8808300
KC		 1979static int _proc_do_string(char *data, int maxlen, int write,
1980 char __user *buffer,
b1ba4ddd 1981 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1982{
1983 size_t len;
1984 char __user *p;
1985 char c;
8d060877
ON		 1986
1987 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1988 *lenp = 0;
1989 return 0;
1990 }
8d060877 1991
1da177e4 1992 if (write) {
f4aacea2
KC		 1993 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1994 /* Only continue writes not past the end of buffer. */
1995 len = strlen(data);
1996 if (len > maxlen - 1)
1997 len = maxlen - 1;
1998
1999 if (*ppos > len)
2000 return 0;
2001 len = *ppos;
2002 } else {
2003 /* Start writing from beginning of buffer. */
2004 len = 0;
2005 }
2006
2ca9bb45 2007 *ppos += *lenp;
1da177e4 2008 p = buffer;
2ca9bb45 2009 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 2010 if (get_user(c, p++))
2011 return -EFAULT;
2012 if (c == 0 || c == '\n')
2013 break;
2ca9bb45 2014 data[len++] = c;
1da177e4 2015 }
f8808300 2016 data[len] = 0;
1da177e4 2017 } else {
f5dd3d6f
SV		 2018 len = strlen(data);
2019 if (len > maxlen)
2020 len = maxlen;
8d060877
ON		 2021
2022 if (*ppos > len) {
2023 *lenp = 0;
2024 return 0;
2025 }
2026
2027 data += *ppos;
2028 len -= *ppos;
2029
1da177e4
LT		 2030 if (len > *lenp)
2031 len = *lenp;
2032 if (len)
f8808300 2033 if (copy_to_user(buffer, data, len))
1da177e4
LT		 2034 return -EFAULT;
2035 if (len < *lenp) {
f8808300 2036 if (put_user('\n', buffer + len))
1da177e4
LT		 2037 return -EFAULT;
2038 len++;
2039 }
2040 *lenp = len;
2041 *ppos += len;
2042 }
2043 return 0;
2044}
2045
f4aacea2
KC		 2046static void warn_sysctl_write(struct ctl_table *table)
2047{
2048 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2049 "This will not be supported in the future. To silence this\n"
2050 "warning, set kernel.sysctl_writes_strict = -1\n",
2051 current->comm, table->procname);
2052}
2053
d383d484 2054/**
5f733e8a 2055 * proc_first_pos_non_zero_ignore - check if first position is allowed
d383d484
LR		 2056 * @ppos: file position
2057 * @table: the sysctl table
2058 *
2059 * Returns true if the first position is non-zero and the sysctl_writes_strict
2060 * mode indicates this is not allowed for numeric input types. String proc
5f733e8a 2061 * handlers can ignore the return value.
d383d484
LR		 2062 */
2063static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2064 struct ctl_table *table)
2065{
2066 if (!*ppos)
2067 return false;
2068
2069 switch (sysctl_writes_strict) {
2070 case SYSCTL_WRITES_STRICT:
2071 return true;
2072 case SYSCTL_WRITES_WARN:
2073 warn_sysctl_write(table);
2074 return false;
2075 default:
2076 return false;
2077 }
2078}
2079
f5dd3d6f
SV		 2080/**
2081 * proc_dostring - read a string sysctl
2082 * @table: the sysctl table
2083 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 2084 * @buffer: the user buffer
2085 * @lenp: the size of the user buffer
2086 * @ppos: file position
2087 *
2088 * Reads/writes a string from/to the user buffer. If the kernel
2089 * buffer provided is not large enough to hold the string, the
2090 * string is truncated. The copied string is %NULL-terminated.
2091 * If the string is being read by the user process, it is copied
2092 * and a newline '\n' is added. It is truncated if the buffer is
2093 * not large enough.
2094 *
2095 * Returns 0 on success.
2096 */
8d65af78 2097int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 2098 void __user *buffer, size_t *lenp, loff_t *ppos)
2099{
d383d484
LR		 2100 if (write)
2101 proc_first_pos_non_zero_ignore(ppos, table);
f4aacea2 2102
f8808300
KC		 2103 return _proc_do_string((char *)(table->data), table->maxlen, write,
2104 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 2105}
2106
00b7c339
AW		 2107static size_t proc_skip_spaces(char **buf)
2108{
2109 size_t ret;
2110 char *tmp = skip_spaces(*buf);
2111 ret = tmp - *buf;
2112 *buf = tmp;
2113 return ret;
2114}
2115
9f977fb7
OP		 2116static void proc_skip_char(char **buf, size_t *size, const char v)
2117{
2118 while (*size) {
2119 if (**buf != v)
2120 break;
2121 (*size)--;
2122 (*buf)++;
2123 }
2124}
2125
7f2923c4
CB		 2126/**
2127 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2128 * fail on overflow
2129 *
2130 * @cp: kernel buffer containing the string to parse
2131 * @endp: pointer to store the trailing characters
2132 * @base: the base to use
2133 * @res: where the parsed integer will be stored
2134 *
2135 * In case of success 0 is returned and @res will contain the parsed integer,
2136 * @endp will hold any trailing characters.
2137 * This function will fail the parse on overflow. If there wasn't an overflow
2138 * the function will defer the decision what characters count as invalid to the
2139 * caller.
2140 */
2141static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
2142 unsigned long *res)
2143{
2144 unsigned long long result;
2145 unsigned int rv;
2146
2147 cp = _parse_integer_fixup_radix(cp, &base);
2148 rv = _parse_integer(cp, base, &result);
2149 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
2150 return -ERANGE;
2151
2152 cp += rv;
2153
2154 if (endp)
2155 *endp = (char *)cp;
2156
2157 *res = (unsigned long)result;
2158 return 0;
2159}
2160
00b7c339
AW		 2161#define TMPBUFLEN 22
2162/**
0fc377bd 2163 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2164 *
0fc377bd
RD		 2165 * @buf: a kernel buffer
2166 * @size: size of the kernel buffer
2167 * @val: this is where the number will be stored
2168 * @neg: set to %TRUE if number is negative
2169 * @perm_tr: a vector which contains the allowed trailers
2170 * @perm_tr_len: size of the perm_tr vector
2171 * @tr: pointer to store the trailer character
00b7c339 2172 *
0fc377bd
RD		 2173 * In case of success %0 is returned and @buf and @size are updated with
2174 * the amount of bytes read. If @tr is non-NULL and a trailing
2175 * character exists (size is non-zero after returning from this
2176 * function), @tr is updated with the trailing character.
00b7c339
AW		 2177 */
2178static int proc_get_long(char **buf, size_t *size,
2179 unsigned long *val, bool *neg,
2180 const char *perm_tr, unsigned perm_tr_len, char *tr)
2181{
2182 int len;
2183 char *p, tmp[TMPBUFLEN];
2184
2185 if (!*size)
2186 return -EINVAL;
2187
2188 len = *size;
2189 if (len > TMPBUFLEN - 1)
2190 len = TMPBUFLEN - 1;
2191
2192 memcpy(tmp, *buf, len);
2193
2194 tmp[len] = 0;
2195 p = tmp;
2196 if (*p == '-' && *size > 1) {
2197 *neg = true;
2198 p++;
2199 } else
2200 *neg = false;
2201 if (!isdigit(*p))
2202 return -EINVAL;
2203
7f2923c4
CB		 2204 if (strtoul_lenient(p, &p, 0, val))
2205 return -EINVAL;
00b7c339
AW		 2206
2207 len = p - tmp;
2208
2209 /* We don't know if the next char is whitespace thus we may accept
2210 * invalid integers (e.g. 1234...a) or two integers instead of one
2211 * (e.g. 123...1). So lets not allow such large numbers. */
2212 if (len == TMPBUFLEN - 1)
2213 return -EINVAL;
2214
2215 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2216 return -EINVAL;
1da177e4 2217
00b7c339
AW		 2218 if (tr && (len < *size))
2219 *tr = *p;
2220
2221 *buf += len;
2222 *size -= len;
2223
2224 return 0;
2225}
2226
2227/**
0fc377bd 2228 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2229 *
0fc377bd
RD		 2230 * @buf: the user buffer
2231 * @size: the size of the user buffer
2232 * @val: the integer to be converted
2233 * @neg: sign of the number, %TRUE for negative
00b7c339 2234 *
0fc377bd
RD		 2235 * In case of success %0 is returned and @buf and @size are updated with
2236 * the amount of bytes written.
00b7c339
AW		 2237 */
2238static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2239 bool neg)
2240{
2241 int len;
2242 char tmp[TMPBUFLEN], *p = tmp;
2243
2244 sprintf(p, "%s%lu", neg ? "-" : "", val);
2245 len = strlen(tmp);
2246 if (len > *size)
2247 len = *size;
2248 if (copy_to_user(*buf, tmp, len))
2249 return -EFAULT;
2250 *size -= len;
2251 *buf += len;
2252 return 0;
2253}
2254#undef TMPBUFLEN
2255
2256static int proc_put_char(void __user **buf, size_t *size, char c)
2257{
2258 if (*size) {
2259 char __user **buffer = (char __user **)buf;
2260 if (put_user(c, *buffer))
2261 return -EFAULT;
2262 (*size)--, (*buffer)++;
2263 *buf = *buffer;
2264 }
2265 return 0;
2266}
1da177e4 2267
00b7c339 2268static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2269 int *valp,
2270 int write, void *data)
2271{
2272 if (write) {
230633d1
HS		 2273 if (*negp) {
2274 if (*lvalp > (unsigned long) INT_MAX + 1)
2275 return -EINVAL;
2276 *valp = -*lvalp;
2277 } else {
2278 if (*lvalp > (unsigned long) INT_MAX)
2279 return -EINVAL;
2280 *valp = *lvalp;
2281 }
1da177e4
LT		 2282 } else {
2283 int val = *valp;
2284 if (val < 0) {
00b7c339 2285 *negp = true;
9a5bc726 2286 *lvalp = -(unsigned long)val;
1da177e4 2287 } else {
00b7c339 2288 *negp = false;
1da177e4
LT		 2289 *lvalp = (unsigned long)val;
2290 }
2291 }
2292 return 0;
2293}
2294
4f2fec00
LR		 2295static int do_proc_douintvec_conv(unsigned long *lvalp,
2296 unsigned int *valp,
2297 int write, void *data)
e7d316a0
SAK		 2298{
2299 if (write) {
425fffd8
LZ		 2300 if (*lvalp > UINT_MAX)
2301 return -EINVAL;
e7d316a0
SAK		 2302 *valp = *lvalp;
2303 } else {
2304 unsigned int val = *valp;
2305 *lvalp = (unsigned long)val;
2306 }
2307 return 0;
2308}
2309
00b7c339
AW		 2310static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2311
d8217f07 2312static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2313 int write, void __user *buffer,
fcfbd547 2314 size_t *lenp, loff_t *ppos,
00b7c339 2315 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2316 int write, void *data),
2317 void *data)
2318{
00b7c339 2319 int *i, vleft, first = 1, err = 0;
00b7c339 2320 size_t left;
70f6cbb6 2321 char *kbuf = NULL, *p;
1da177e4 2322
00b7c339 2323 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2324 *lenp = 0;
2325 return 0;
2326 }
2327
fcfbd547 2328 i = (int *) tbl_data;
1da177e4
LT		 2329 vleft = table->maxlen / sizeof(*i);
2330 left = *lenp;
2331
2332 if (!conv)
2333 conv = do_proc_dointvec_conv;
2334
00b7c339 2335 if (write) {
d383d484
LR		 2336 if (proc_first_pos_non_zero_ignore(ppos, table))
2337 goto out;
f4aacea2 2338
00b7c339
AW		 2339 if (left > PAGE_SIZE - 1)
2340 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2341 p = kbuf = memdup_user_nul(buffer, left);
2342 if (IS_ERR(kbuf))
2343 return PTR_ERR(kbuf);
00b7c339
AW		 2344 }
2345
1da177e4 2346 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2347 unsigned long lval;
2348 bool neg;
1da177e4 2349
00b7c339 2350 if (write) {
70f6cbb6 2351 left -= proc_skip_spaces(&p);
1da177e4 2352
563b0467
O		 2353 if (!left)
2354 break;
70f6cbb6 2355 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2356 proc_wspace_sep,
2357 sizeof(proc_wspace_sep), NULL);
2358 if (err)
1da177e4 2359 break;
00b7c339
AW		 2360 if (conv(&neg, &lval, i, 1, data)) {
2361 err = -EINVAL;
1da177e4 2362 break;
00b7c339 2363 }
1da177e4 2364 } else {
00b7c339
AW		 2365 if (conv(&neg, &lval, i, 0, data)) {
2366 err = -EINVAL;
2367 break;
2368 }
1da177e4 2369 if (!first)
00b7c339
AW		 2370 err = proc_put_char(&buffer, &left, '\t');
2371 if (err)
2372 break;
2373 err = proc_put_long(&buffer, &left, lval, neg);
2374 if (err)
1da177e4 2375 break;
1da177e4
LT		 2376 }
2377 }
2378
00b7c339
AW		 2379 if (!write && !first && left && !err)
2380 err = proc_put_char(&buffer, &left, '\n');
563b0467 2381 if (write && !err && left)
70f6cbb6 2382 left -= proc_skip_spaces(&p);
1da177e4 2383 if (write) {
70f6cbb6 2384 kfree(kbuf);
00b7c339
AW		 2385 if (first)
2386 return err ? : -EINVAL;
1da177e4 2387 }
1da177e4 2388 *lenp -= left;
f4aacea2 2389out:
1da177e4 2390 *ppos += *lenp;
00b7c339 2391 return err;
1da177e4
LT		 2392}
2393
8d65af78 2394static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2395 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2396 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2397 int write, void *data),
2398 void *data)
2399{
8d65af78 2400 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2401 buffer, lenp, ppos, conv, data);
2402}
2403
4f2fec00
LR		 2404static int do_proc_douintvec_w(unsigned int *tbl_data,
2405 struct ctl_table *table,
2406 void __user *buffer,
2407 size_t *lenp, loff_t *ppos,
2408 int (*conv)(unsigned long *lvalp,
2409 unsigned int *valp,
2410 int write, void *data),
2411 void *data)
2412{
2413 unsigned long lval;
2414 int err = 0;
2415 size_t left;
2416 bool neg;
2417 char *kbuf = NULL, *p;
2418
2419 left = *lenp;
2420
2421 if (proc_first_pos_non_zero_ignore(ppos, table))
2422 goto bail_early;
2423
2424 if (left > PAGE_SIZE - 1)
2425 left = PAGE_SIZE - 1;
2426
2427 p = kbuf = memdup_user_nul(buffer, left);
2428 if (IS_ERR(kbuf))
2429 return -EINVAL;
2430
2431 left -= proc_skip_spaces(&p);
2432 if (!left) {
2433 err = -EINVAL;
2434 goto out_free;
2435 }
2436
2437 err = proc_get_long(&p, &left, &lval, &neg,
2438 proc_wspace_sep,
2439 sizeof(proc_wspace_sep), NULL);
2440 if (err || neg) {
2441 err = -EINVAL;
2442 goto out_free;
2443 }
2444
2445 if (conv(&lval, tbl_data, 1, data)) {
2446 err = -EINVAL;
2447 goto out_free;
2448 }
2449
2450 if (!err && left)
2451 left -= proc_skip_spaces(&p);
2452
2453out_free:
2454 kfree(kbuf);
2455 if (err)
2456 return -EINVAL;
2457
2458 return 0;
2459
2460 /* This is in keeping with old __do_proc_dointvec() */
2461bail_early:
2462 *ppos += *lenp;
2463 return err;
2464}
2465
2466static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2467 size_t *lenp, loff_t *ppos,
2468 int (*conv)(unsigned long *lvalp,
2469 unsigned int *valp,
2470 int write, void *data),
2471 void *data)
2472{
2473 unsigned long lval;
2474 int err = 0;
2475 size_t left;
2476
2477 left = *lenp;
2478
2479 if (conv(&lval, tbl_data, 0, data)) {
2480 err = -EINVAL;
2481 goto out;
2482 }
2483
2484 err = proc_put_long(&buffer, &left, lval, false);
2485 if (err || !left)
2486 goto out;
2487
2488 err = proc_put_char(&buffer, &left, '\n');
2489
2490out:
2491 *lenp -= left;
2492 *ppos += *lenp;
2493
2494 return err;
2495}
2496
2497static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2498 int write, void __user *buffer,
2499 size_t *lenp, loff_t *ppos,
2500 int (*conv)(unsigned long *lvalp,
2501 unsigned int *valp,
2502 int write, void *data),
2503 void *data)
2504{
2505 unsigned int *i, vleft;
2506
2507 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2508 *lenp = 0;
2509 return 0;
2510 }
2511
2512 i = (unsigned int *) tbl_data;
2513 vleft = table->maxlen / sizeof(*i);
2514
2515 /*
2516 * Arrays are not supported, keep this simple. *Do not* add
2517 * support for them.
2518 */
2519 if (vleft != 1) {
2520 *lenp = 0;
2521 return -EINVAL;
2522 }
2523
2524 if (!conv)
2525 conv = do_proc_douintvec_conv;
2526
2527 if (write)
2528 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2529 conv, data);
2530 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2531}
2532
2533static int do_proc_douintvec(struct ctl_table *table, int write,
2534 void __user *buffer, size_t *lenp, loff_t *ppos,
2535 int (*conv)(unsigned long *lvalp,
2536 unsigned int *valp,
2537 int write, void *data),
2538 void *data)
2539{
2540 return __do_proc_douintvec(table->data, table, write,
2541 buffer, lenp, ppos, conv, data);
2542}
2543
1da177e4
LT		 2544/**
2545 * proc_dointvec - read a vector of integers
2546 * @table: the sysctl table
2547 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2548 * @buffer: the user buffer
2549 * @lenp: the size of the user buffer
2550 * @ppos: file position
2551 *
2552 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2553 * values from/to the user buffer, treated as an ASCII string.
2554 *
2555 * Returns 0 on success.
2556 */
8d65af78 2557int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2558 void __user *buffer, size_t *lenp, loff_t *ppos)
2559{
e7d316a0
SAK		 2560 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2561}
2562
6923aa0d
SAS		 2563#ifdef CONFIG_COMPACTION
2564static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
2565 int write, void __user *buffer,
2566 size_t *lenp, loff_t *ppos)
2567{
2568 int ret, old;
2569
2570 if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
2571 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2572
2573 old = *(int *)table->data;
2574 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2575 if (ret)
2576 return ret;
2577 if (old != *(int *)table->data)
2578 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
2579 table->procname, current->comm,
2580 task_pid_nr(current));
2581 return ret;
2582}
2583#endif
2584
e7d316a0
SAK		 2585/**
2586 * proc_douintvec - read a vector of unsigned integers
2587 * @table: the sysctl table
2588 * @write: %TRUE if this is a write to the sysctl file
2589 * @buffer: the user buffer
2590 * @lenp: the size of the user buffer
2591 * @ppos: file position
2592 *
2593 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2594 * values from/to the user buffer, treated as an ASCII string.
2595 *
2596 * Returns 0 on success.
2597 */
2598int proc_douintvec(struct ctl_table *table, int write,
2599 void __user *buffer, size_t *lenp, loff_t *ppos)
2600{
4f2fec00
LR		 2601 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2602 do_proc_douintvec_conv, NULL);
1da177e4
LT		 2603}
2604
34f5a398 2605/*
25ddbb18
AK		 2606 * Taint values can only be increased
2607 * This means we can safely use a temporary.
34f5a398 2608 */
8d65af78 2609static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2610 void __user *buffer, size_t *lenp, loff_t *ppos)
2611{
25ddbb18
AK		 2612 struct ctl_table t;
2613 unsigned long tmptaint = get_taint();
2614 int err;
34f5a398 2615
91fcd412 2616 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2617 return -EPERM;
2618
25ddbb18
AK		 2619 t = *table;
2620 t.data = &tmptaint;
8d65af78 2621 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2622 if (err < 0)
2623 return err;
2624
2625 if (write) {
2626 /*
2627 * Poor man's atomic or. Not worth adding a primitive
2628 * to everyone's atomic.h for this
2629 */
2630 int i;
2631 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2632 if ((tmptaint >> i) & 1)
373d4d09 2633 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2634 }
2635 }
2636
2637 return err;
34f5a398
TT		 2638}
2639
bfdc0b49 2640#ifdef CONFIG_PRINTK
620f6e8e 2641static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2642 void __user *buffer, size_t *lenp, loff_t *ppos)
2643{
2644 if (write && !capable(CAP_SYS_ADMIN))
2645 return -EPERM;
2646
2647 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2648}
2649#endif
2650
24704f36
WL		 2651/**
2652 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2653 * @min: pointer to minimum allowable value
2654 * @max: pointer to maximum allowable value
2655 *
2656 * The do_proc_dointvec_minmax_conv_param structure provides the
2657 * minimum and maximum values for doing range checking for those sysctl
2658 * parameters that use the proc_dointvec_minmax() handler.
2659 */
1da177e4
LT		 2660struct do_proc_dointvec_minmax_conv_param {
2661 int *min;
2662 int *max;
2663};
2664
00b7c339
AW		 2665static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2666 int *valp,
1da177e4
LT		 2667 int write, void *data)
2668{
2bc4fc60 2669 int tmp, ret;
1da177e4 2670 struct do_proc_dointvec_minmax_conv_param *param = data;
2bc4fc60
ZW		 2671 /*
2672 * If writing, first do so via a temporary local int so we can
2673 * bounds-check it before touching *valp.
2674 */
2675 int *ip = write ? &tmp : valp;
2676
2677 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
2678 if (ret)
2679 return ret;
2680
1da177e4 2681 if (write) {
2bc4fc60
ZW		 2682 if ((param->min && *param->min > tmp) ||
2683 (param->max && *param->max < tmp))
1da177e4 2684 return -EINVAL;
2bc4fc60 2685 *valp = tmp;
1da177e4 2686 }
2bc4fc60 2687
1da177e4
LT		 2688 return 0;
2689}
2690
2691/**
2692 * proc_dointvec_minmax - read a vector of integers with min/max values
2693 * @table: the sysctl table
2694 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2695 * @buffer: the user buffer
2696 * @lenp: the size of the user buffer
2697 * @ppos: file position
2698 *
2699 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2700 * values from/to the user buffer, treated as an ASCII string.
2701 *
2702 * This routine will ensure the values are within the range specified by
2703 * table->extra1 (min) and table->extra2 (max).
2704 *
24704f36 2705 * Returns 0 on success or -EINVAL on write when the range check fails.
1da177e4 2706 */
8d65af78 2707int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2708 void __user *buffer, size_t *lenp, loff_t *ppos)
2709{
2710 struct do_proc_dointvec_minmax_conv_param param = {
2711 .min = (int *) table->extra1,
2712 .max = (int *) table->extra2,
2713 };
8d65af78 2714 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2715 do_proc_dointvec_minmax_conv, &param);
2716}
2717
24704f36
WL		 2718/**
2719 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2720 * @min: pointer to minimum allowable value
2721 * @max: pointer to maximum allowable value
2722 *
2723 * The do_proc_douintvec_minmax_conv_param structure provides the
2724 * minimum and maximum values for doing range checking for those sysctl
2725 * parameters that use the proc_douintvec_minmax() handler.
2726 */
61d9b56a
LR		 2727struct do_proc_douintvec_minmax_conv_param {
2728 unsigned int *min;
2729 unsigned int *max;
2730};
2731
2732static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2733 unsigned int *valp,
2734 int write, void *data)
2735{
2bc4fc60
ZW		 2736 int ret;
2737 unsigned int tmp;
61d9b56a 2738 struct do_proc_douintvec_minmax_conv_param *param = data;
2bc4fc60
ZW		 2739 /* write via temporary local uint for bounds-checking */
2740 unsigned int *up = write ? &tmp : valp;
61d9b56a 2741
2bc4fc60
ZW		 2742 ret = do_proc_douintvec_conv(lvalp, up, write, data);
2743 if (ret)
2744 return ret;
fb910c42 2745
2bc4fc60
ZW		 2746 if (write) {
2747 if ((param->min && *param->min > tmp) ||
2748 (param->max && *param->max < tmp))
61d9b56a
LR		 2749 return -ERANGE;
2750
2bc4fc60 2751 *valp = tmp;
61d9b56a
LR		 2752 }
2753
2754 return 0;
2755}
2756
2757/**
2758 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2759 * @table: the sysctl table
2760 * @write: %TRUE if this is a write to the sysctl file
2761 * @buffer: the user buffer
2762 * @lenp: the size of the user buffer
2763 * @ppos: file position
2764 *
2765 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2766 * values from/to the user buffer, treated as an ASCII string. Negative
2767 * strings are not allowed.
2768 *
2769 * This routine will ensure the values are within the range specified by
2770 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2771 * check for UINT_MAX to avoid having to support wrap around uses from
2772 * userspace.
2773 *
24704f36 2774 * Returns 0 on success or -ERANGE on write when the range check fails.
61d9b56a
LR		 2775 */
2776int proc_douintvec_minmax(struct ctl_table *table, int write,
2777 void __user *buffer, size_t *lenp, loff_t *ppos)
2778{
2779 struct do_proc_douintvec_minmax_conv_param param = {
2780 .min = (unsigned int *) table->extra1,
2781 .max = (unsigned int *) table->extra2,
2782 };
2783 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2784 do_proc_douintvec_minmax_conv, &param);
2785}
2786
7a8d1819
JL		 2787static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2788 unsigned int *valp,
2789 int write, void *data)
2790{
7a8d1819 2791 if (write) {
fb910c42 2792 unsigned int val;
7a8d1819 2793
fb910c42 2794 val = round_pipe_size(*lvalp);
7a8d1819
JL		 2795 if (val == 0)
2796 return -EINVAL;
2797
7a8d1819
JL		 2798 *valp = val;
2799 } else {
2800 unsigned int val = *valp;
2801 *lvalp = (unsigned long) val;
2802 }
2803
2804 return 0;
2805}
2806
319e0a21
EB		 2807static int proc_dopipe_max_size(struct ctl_table *table, int write,
2808 void __user *buffer, size_t *lenp, loff_t *ppos)
7a8d1819 2809{
7a8d1819 2810 return do_proc_douintvec(table, write, buffer, lenp, ppos,
4c2e4bef 2811 do_proc_dopipe_max_size_conv, NULL);
7a8d1819
JL		 2812}
2813
54b50199
KC		 2814static void validate_coredump_safety(void)
2815{
046d662f 2816#ifdef CONFIG_COREDUMP
e579d2c2 2817 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199 2818 core_pattern[0] != '/' && core_pattern[0] != '|') {
760c6a91
AD		 2819 printk(KERN_WARNING
2820"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2821"Pipe handler or fully qualified core dump path required.\n"
2822"Set kernel.core_pattern before fs.suid_dumpable.\n"
2823 );
54b50199 2824 }
046d662f 2825#endif
54b50199
KC		 2826}
2827
2828static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2829 void __user *buffer, size_t *lenp, loff_t *ppos)
2830{
2831 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2832 if (!error)
2833 validate_coredump_safety();
2834 return error;
2835}
2836
046d662f 2837#ifdef CONFIG_COREDUMP
54b50199
KC		 2838static int proc_dostring_coredump(struct ctl_table *table, int write,
2839 void __user *buffer, size_t *lenp, loff_t *ppos)
2840{
2841 int error = proc_dostring(table, write, buffer, lenp, ppos);
2842 if (!error)
2843 validate_coredump_safety();
2844 return error;
2845}
046d662f 2846#endif
54b50199 2847
eaee4172
DS		 2848#ifdef CONFIG_MAGIC_SYSRQ
2849static int sysrq_sysctl_handler(struct ctl_table *table, int write,
2850 void __user *buffer, size_t *lenp, loff_t *ppos)
2851{
2852 int tmp, ret;
2853
2854 tmp = sysrq_mask();
2855
2856 ret = __do_proc_dointvec(&tmp, table, write, buffer,
2857 lenp, ppos, NULL, NULL);
2858 if (ret || !write)
2859 return ret;
2860
2861 if (write)
2862 sysrq_toggle_support(tmp);
2863
2864 return 0;
2865}
2866#endif
2867
d8217f07 2868static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2869 void __user *buffer,
2870 size_t *lenp, loff_t *ppos,
2871 unsigned long convmul,
2872 unsigned long convdiv)
2873{
00b7c339
AW		 2874 unsigned long *i, *min, *max;
2875 int vleft, first = 1, err = 0;
00b7c339 2876 size_t left;
70f6cbb6 2877 char *kbuf = NULL, *p;
00b7c339
AW		 2878
2879 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2880 *lenp = 0;
2881 return 0;
2882 }
00b7c339 2883
fcfbd547 2884 i = (unsigned long *) data;
1da177e4
LT		 2885 min = (unsigned long *) table->extra1;
2886 max = (unsigned long *) table->extra2;
2887 vleft = table->maxlen / sizeof(unsigned long);
2888 left = *lenp;
00b7c339
AW		 2889
2890 if (write) {
d383d484
LR		 2891 if (proc_first_pos_non_zero_ignore(ppos, table))
2892 goto out;
f4aacea2 2893
00b7c339
AW		 2894 if (left > PAGE_SIZE - 1)
2895 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2896 p = kbuf = memdup_user_nul(buffer, left);
2897 if (IS_ERR(kbuf))
2898 return PTR_ERR(kbuf);
00b7c339
AW		 2899 }
2900
27b3d80a 2901 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2902 unsigned long val;
2903
1da177e4 2904 if (write) {
00b7c339
AW		 2905 bool neg;
2906
70f6cbb6 2907 left -= proc_skip_spaces(&p);
09be1784
CL		 2908 if (!left)
2909 break;
00b7c339 2910
70f6cbb6 2911 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2912 proc_wspace_sep,
2913 sizeof(proc_wspace_sep), NULL);
2914 if (err)
1da177e4
LT		 2915 break;
2916 if (neg)
1da177e4 2917 continue;
ff9f8a7c 2918 val = convmul * val / convdiv;
e260ad01
CB		 2919 if ((min && val < *min) || (max && val > *max)) {
2920 err = -EINVAL;
2921 break;
2922 }
1da177e4
LT		 2923 *i = val;
2924 } else {
00b7c339 2925 val = convdiv * (*i) / convmul;
7833819d 2926 if (!first) {
00b7c339 2927 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2928 if (err)
2929 break;
2930 }
00b7c339
AW		 2931 err = proc_put_long(&buffer, &left, val, false);
2932 if (err)
2933 break;
1da177e4
LT		 2934 }
2935 }
2936
00b7c339
AW		 2937 if (!write && !first && left && !err)
2938 err = proc_put_char(&buffer, &left, '\n');
2939 if (write && !err)
70f6cbb6 2940 left -= proc_skip_spaces(&p);
1da177e4 2941 if (write) {
70f6cbb6 2942 kfree(kbuf);
00b7c339
AW		 2943 if (first)
2944 return err ? : -EINVAL;
1da177e4 2945 }
1da177e4 2946 *lenp -= left;
f4aacea2 2947out:
1da177e4 2948 *ppos += *lenp;
00b7c339 2949 return err;
1da177e4
LT		 2950}
2951
d8217f07 2952static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2953 void __user *buffer,
2954 size_t *lenp, loff_t *ppos,
2955 unsigned long convmul,
2956 unsigned long convdiv)
2957{
2958 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2959 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2960}
2961
1da177e4
LT		 2962/**
2963 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2964 * @table: the sysctl table
2965 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2966 * @buffer: the user buffer
2967 * @lenp: the size of the user buffer
2968 * @ppos: file position
2969 *
2970 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2971 * values from/to the user buffer, treated as an ASCII string.
2972 *
2973 * This routine will ensure the values are within the range specified by
2974 * table->extra1 (min) and table->extra2 (max).
2975 *
2976 * Returns 0 on success.
2977 */
8d65af78 2978int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2979 void __user *buffer, size_t *lenp, loff_t *ppos)
2980{
8d65af78 2981 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2982}
2983
2984/**
2985 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2986 * @table: the sysctl table
2987 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2988 * @buffer: the user buffer
2989 * @lenp: the size of the user buffer
2990 * @ppos: file position
2991 *
2992 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2993 * values from/to the user buffer, treated as an ASCII string. The values
2994 * are treated as milliseconds, and converted to jiffies when they are stored.
2995 *
2996 * This routine will ensure the values are within the range specified by
2997 * table->extra1 (min) and table->extra2 (max).
2998 *
2999 * Returns 0 on success.
3000 */
d8217f07 3001int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3002 void __user *buffer,
3003 size_t *lenp, loff_t *ppos)
3004{
8d65af78 3005 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 3006 lenp, ppos, HZ, 1000l);
3007}
3008
3009
00b7c339 3010static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 3011 int *valp,
3012 int write, void *data)
3013{
3014 if (write) {
63259457 3015 if (*lvalp > INT_MAX / HZ)
cba9f33d 3016 return 1;
1da177e4
LT		 3017 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
3018 } else {
3019 int val = *valp;
3020 unsigned long lval;
3021 if (val < 0) {
00b7c339 3022 *negp = true;
9a5bc726 3023 lval = -(unsigned long)val;
1da177e4 3024 } else {
00b7c339 3025 *negp = false;
1da177e4
LT		 3026 lval = (unsigned long)val;
3027 }
3028 *lvalp = lval / HZ;
3029 }
3030 return 0;
3031}
3032
00b7c339 3033static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 3034 int *valp,
3035 int write, void *data)
3036{
3037 if (write) {
cba9f33d
BS		 3038 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
3039 return 1;
1da177e4
LT		 3040 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
3041 } else {
3042 int val = *valp;
3043 unsigned long lval;
3044 if (val < 0) {
00b7c339 3045 *negp = true;
9a5bc726 3046 lval = -(unsigned long)val;
1da177e4 3047 } else {
00b7c339 3048 *negp = false;
1da177e4
LT		 3049 lval = (unsigned long)val;
3050 }
3051 *lvalp = jiffies_to_clock_t(lval);
3052 }
3053 return 0;
3054}
3055
00b7c339 3056static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 3057 int *valp,
3058 int write, void *data)
3059{
3060 if (write) {
d738ce8f
FF		 3061 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
3062
3063 if (jif > INT_MAX)
3064 return 1;
3065 *valp = (int)jif;
1da177e4
LT		 3066 } else {
3067 int val = *valp;
3068 unsigned long lval;
3069 if (val < 0) {
00b7c339 3070 *negp = true;
9a5bc726 3071 lval = -(unsigned long)val;
1da177e4 3072 } else {
00b7c339 3073 *negp = false;
1da177e4
LT		 3074 lval = (unsigned long)val;
3075 }
3076 *lvalp = jiffies_to_msecs(lval);
3077 }
3078 return 0;
3079}
3080
3081/**
3082 * proc_dointvec_jiffies - read a vector of integers as seconds
3083 * @table: the sysctl table
3084 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 3085 * @buffer: the user buffer
3086 * @lenp: the size of the user buffer
3087 * @ppos: file position
3088 *
3089 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3090 * values from/to the user buffer, treated as an ASCII string.
3091 * The values read are assumed to be in seconds, and are converted into
3092 * jiffies.
3093 *
3094 * Returns 0 on success.
3095 */
8d65af78 3096int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3097 void __user *buffer, size_t *lenp, loff_t *ppos)
3098{
8d65af78 3099 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 3100 do_proc_dointvec_jiffies_conv,NULL);
3101}
3102
3103/**
3104 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3105 * @table: the sysctl table
3106 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 3107 * @buffer: the user buffer
3108 * @lenp: the size of the user buffer
1e5d5331 3109 * @ppos: pointer to the file position
1da177e4
LT		 3110 *
3111 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3112 * values from/to the user buffer, treated as an ASCII string.
3113 * The values read are assumed to be in 1/USER_HZ seconds, and
3114 * are converted into jiffies.
3115 *
3116 * Returns 0 on success.
3117 */
8d65af78 3118int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3119 void __user *buffer, size_t *lenp, loff_t *ppos)
3120{
8d65af78 3121 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 3122 do_proc_dointvec_userhz_jiffies_conv,NULL);
3123}
3124
3125/**
3126 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3127 * @table: the sysctl table
3128 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 3129 * @buffer: the user buffer
3130 * @lenp: the size of the user buffer
67be2dd1
MW		 3131 * @ppos: file position
3132 * @ppos: the current position in the file
1da177e4
LT		 3133 *
3134 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3135 * values from/to the user buffer, treated as an ASCII string.
3136 * The values read are assumed to be in 1/1000 seconds, and
3137 * are converted into jiffies.
3138 *
3139 * Returns 0 on success.
3140 */
8d65af78 3141int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3142 void __user *buffer, size_t *lenp, loff_t *ppos)
3143{
8d65af78 3144 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 3145 do_proc_dointvec_ms_jiffies_conv, NULL);
3146}
3147
8d65af78 3148static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 3149 void __user *buffer, size_t *lenp, loff_t *ppos)
3150{
3151 struct pid *new_pid;
3152 pid_t tmp;
3153 int r;
3154
6c5f3e7b 3155 tmp = pid_vnr(cad_pid);
9ec52099 3156
8d65af78 3157 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 3158 lenp, ppos, NULL, NULL);
3159 if (r || !write)
3160 return r;
3161
3162 new_pid = find_get_pid(tmp);
3163 if (!new_pid)
3164 return -ESRCH;
3165
3166 put_pid(xchg(&cad_pid, new_pid));
3167 return 0;
3168}
3169
9f977fb7
OP		 3170/**
3171 * proc_do_large_bitmap - read/write from/to a large bitmap
3172 * @table: the sysctl table
3173 * @write: %TRUE if this is a write to the sysctl file
3174 * @buffer: the user buffer
3175 * @lenp: the size of the user buffer
3176 * @ppos: file position
3177 *
3178 * The bitmap is stored at table->data and the bitmap length (in bits)
3179 * in table->maxlen.
3180 *
3181 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3182 * large bitmaps may be represented in a compact manner. Writing into
3183 * the file will clear the bitmap then update it with the given input.
3184 *
3185 * Returns 0 on success.
3186 */
3187int proc_do_large_bitmap(struct ctl_table *table, int write,
3188 void __user *buffer, size_t *lenp, loff_t *ppos)
3189{
3190 int err = 0;
3191 bool first = 1;
3192 size_t left = *lenp;
3193 unsigned long bitmap_len = table->maxlen;
122ff243 3194 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 3195 unsigned long *tmp_bitmap = NULL;
3196 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3197
122ff243 3198 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 3199 *lenp = 0;
3200 return 0;
3201 }
3202
3203 if (write) {
70f6cbb6 3204 char *kbuf, *p;
3116ad38 3205 size_t skipped = 0;
9f977fb7 3206
3116ad38 3207 if (left > PAGE_SIZE - 1) {
9f977fb7 3208 left = PAGE_SIZE - 1;
3116ad38
ES		 3209 /* How much of the buffer we'll skip this pass */
3210 skipped = *lenp - left;
3211 }
9f977fb7 3212
70f6cbb6
AV		 3213 p = kbuf = memdup_user_nul(buffer, left);
3214 if (IS_ERR(kbuf))
3215 return PTR_ERR(kbuf);
9f977fb7 3216
475dae38 3217 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
9f977fb7 3218 if (!tmp_bitmap) {
70f6cbb6 3219 kfree(kbuf);
9f977fb7
OP		 3220 return -ENOMEM;
3221 }
70f6cbb6 3222 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 3223 while (!err && left) {
3224 unsigned long val_a, val_b;
3225 bool neg;
3116ad38 3226 size_t saved_left;
9f977fb7 3227
3116ad38
ES		 3228 /* In case we stop parsing mid-number, we can reset */
3229 saved_left = left;
70f6cbb6 3230 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7 3231 sizeof(tr_a), &c);
3116ad38
ES		 3232 /*
3233 * If we consumed the entirety of a truncated buffer or
3234 * only one char is left (may be a "-"), then stop here,
3235 * reset, & come back for more.
3236 */
3237 if ((left <= 1) && skipped) {
3238 left = saved_left;
3239 break;
3240 }
3241
9f977fb7
OP		 3242 if (err)
3243 break;
3244 if (val_a >= bitmap_len || neg) {
3245 err = -EINVAL;
3246 break;
3247 }
3248
3249 val_b = val_a;
3250 if (left) {
70f6cbb6 3251 p++;
9f977fb7
OP		 3252 left--;
3253 }
3254
3255 if (c == '-') {
70f6cbb6 3256 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 3257 &neg, tr_b, sizeof(tr_b),
3258 &c);
3116ad38
ES		 3259 /*
3260 * If we consumed all of a truncated buffer or
3261 * then stop here, reset, & come back for more.
3262 */
3263 if (!left && skipped) {
3264 left = saved_left;
3265 break;
3266 }
3267
9f977fb7
OP		 3268 if (err)
3269 break;
3270 if (val_b >= bitmap_len || neg ||
3271 val_a > val_b) {
3272 err = -EINVAL;
3273 break;
3274 }
3275 if (left) {
70f6cbb6 3276 p++;
9f977fb7
OP		 3277 left--;
3278 }
3279 }
3280
5a04cca6 3281 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 3282 first = 0;
70f6cbb6 3283 proc_skip_char(&p, &left, '\n');
9f977fb7 3284 }
70f6cbb6 3285 kfree(kbuf);
3116ad38 3286 left += skipped;
9f977fb7
OP		 3287 } else {
3288 unsigned long bit_a, bit_b = 0;
3289
3290 while (left) {
3291 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3292 if (bit_a >= bitmap_len)
3293 break;
3294 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3295 bit_a + 1) - 1;
3296
3297 if (!first) {
3298 err = proc_put_char(&buffer, &left, ',');
3299 if (err)
3300 break;
3301 }
3302 err = proc_put_long(&buffer, &left, bit_a, false);
3303 if (err)
3304 break;
3305 if (bit_a != bit_b) {
3306 err = proc_put_char(&buffer, &left, '-');
3307 if (err)
3308 break;
3309 err = proc_put_long(&buffer, &left, bit_b, false);
3310 if (err)
3311 break;
3312 }
3313
3314 first = 0; bit_b++;
3315 }
3316 if (!err)
3317 err = proc_put_char(&buffer, &left, '\n');
3318 }
3319
3320 if (!err) {
3321 if (write) {
3322 if (*ppos)
3323 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3324 else
5a04cca6 3325 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7 3326 }
9f977fb7
OP		 3327 *lenp -= left;
3328 *ppos += *lenp;
9f977fb7 3329 }
f9eb2fdd 3330
475dae38 3331 bitmap_free(tmp_bitmap);
f9eb2fdd 3332 return err;
9f977fb7
OP		 3333}
3334
55610500 3335#else /* CONFIG_PROC_SYSCTL */
1da177e4 3336
8d65af78 3337int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 3338 void __user *buffer, size_t *lenp, loff_t *ppos)
3339{
3340 return -ENOSYS;
3341}
3342
8d65af78 3343int proc_dointvec(struct ctl_table *table, int write,
1da177e4 3344 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 3345{
3346 return -ENOSYS;
3347}
3348
e7d316a0
SAK		 3349int proc_douintvec(struct ctl_table *table, int write,
3350 void __user *buffer, size_t *lenp, loff_t *ppos)
3351{
3352 return -ENOSYS;
3353}
3354
8d65af78 3355int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3356 void __user *buffer, size_t *lenp, loff_t *ppos)
3357{
3358 return -ENOSYS;
3359}
3360
61d9b56a
LR		 3361int proc_douintvec_minmax(struct ctl_table *table, int write,
3362 void __user *buffer, size_t *lenp, loff_t *ppos)
3363{
3364 return -ENOSYS;
3365}
3366
8d65af78 3367int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3368 void __user *buffer, size_t *lenp, loff_t *ppos)
3369{
3370 return -ENOSYS;
3371}
3372
8d65af78 3373int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3374 void __user *buffer, size_t *lenp, loff_t *ppos)
3375{
3376 return -ENOSYS;
3377}
3378
8d65af78 3379int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3380 void __user *buffer, size_t *lenp, loff_t *ppos)
3381{
3382 return -ENOSYS;
3383}
3384
8d65af78 3385int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3386 void __user *buffer, size_t *lenp, loff_t *ppos)
3387{
3388 return -ENOSYS;
3389}
3390
d8217f07 3391int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3392 void __user *buffer,
3393 size_t *lenp, loff_t *ppos)
3394{
3395 return -ENOSYS;
3396}
3397
0bc19985
SS		 3398int proc_do_large_bitmap(struct ctl_table *table, int write,
3399 void __user *buffer, size_t *lenp, loff_t *ppos)
3400{
3401 return -ENOSYS;
3402}
1da177e4 3403
55610500 3404#endif /* CONFIG_PROC_SYSCTL */
1da177e4 3405
a8e11e5c
ED		 3406#if defined(CONFIG_SYSCTL)
3407int proc_do_static_key(struct ctl_table *table, int write,
3408 void __user *buffer, size_t *lenp,
3409 loff_t *ppos)
492ecee8 3410{
a8e11e5c
ED		 3411 struct static_key *key = (struct static_key *)table->data;
3412 static DEFINE_MUTEX(static_key_mutex);
3413 int val, ret;
3414 struct ctl_table tmp = {
3415 .data = &val,
3416 .maxlen = sizeof(val),
3417 .mode = table->mode,
eec4844f
MC		 3418 .extra1 = SYSCTL_ZERO,
3419 .extra2 = SYSCTL_ONE,
a8e11e5c 3420 };
492ecee8
AS		 3421
3422 if (write && !capable(CAP_SYS_ADMIN))
3423 return -EPERM;
3424
a8e11e5c
ED		 3425 mutex_lock(&static_key_mutex);
3426 val = static_key_enabled(key);
492ecee8
AS		 3427 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3428 if (write && !ret) {
a8e11e5c
ED		 3429 if (val)
3430 static_key_enable(key);
492ecee8 3431 else
a8e11e5c 3432 static_key_disable(key);
492ecee8 3433 }
a8e11e5c 3434 mutex_unlock(&static_key_mutex);
492ecee8
AS		 3435 return ret;
3436}
3fcc5530 3437#endif
1da177e4
LT		 3438/*
3439 * No sense putting this after each symbol definition, twice,
3440 * exception granted :-)
3441 */
3442EXPORT_SYMBOL(proc_dointvec);
e7d316a0 3443EXPORT_SYMBOL(proc_douintvec);
1da177e4
LT		 3444EXPORT_SYMBOL(proc_dointvec_jiffies);
3445EXPORT_SYMBOL(proc_dointvec_minmax);
61d9b56a 3446EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
1da177e4
LT		 3447EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3448EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3449EXPORT_SYMBOL(proc_dostring);
3450EXPORT_SYMBOL(proc_doulongvec_minmax);
3451EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
0bc19985 3452EXPORT_SYMBOL(proc_do_large_bitmap);
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