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iommu/amd: Apply the same IVRS IOAPIC workaround to Acer Aspire A315-41
[linux-2.6-block.git] / kernel / sysctl.c
CommitLineData
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);
d6f8ff73 215#endif
9ec52099 216
bfdc0b49 217#ifdef CONFIG_PRINTK
620f6e8e 218static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 219 void __user *buffer, size_t *lenp, loff_t *ppos);
220#endif
221
54b50199
KC		 222static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
223 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 224#ifdef CONFIG_COREDUMP
54b50199
KC		 225static int proc_dostring_coredump(struct ctl_table *table, int write,
226 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 227#endif
319e0a21
EB		 228static int proc_dopipe_max_size(struct ctl_table *table, int write,
229 void __user *buffer, size_t *lenp, loff_t *ppos);
54b50199 230
97f5f0cd 231#ifdef CONFIG_MAGIC_SYSRQ
5f733e8a 232/* Note: sysrq code uses its own private copy */
8eaede49 233static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
97f5f0cd 234
6f8fd1d7 235static int sysrq_sysctl_handler(struct ctl_table *table, int write,
97f5f0cd
DT		 236 void __user *buffer, size_t *lenp,
237 loff_t *ppos)
238{
239 int error;
240
241 error = proc_dointvec(table, write, buffer, lenp, ppos);
242 if (error)
243 return error;
244
245 if (write)
246 sysrq_toggle_support(__sysrq_enabled);
247
248 return 0;
249}
250
251#endif
252
d8217f07
EB		 253static struct ctl_table kern_table[];
254static struct ctl_table vm_table[];
255static struct ctl_table fs_table[];
256static struct ctl_table debug_table[];
257static struct ctl_table dev_table[];
258extern struct ctl_table random_table[];
7ef9964e
DL		 259#ifdef CONFIG_EPOLL
260extern struct ctl_table epoll_table[];
261#endif
1da177e4 262
ceb18132
LR		 263#ifdef CONFIG_FW_LOADER_USER_HELPER
264extern struct ctl_table firmware_config_table[];
265#endif
266
67f3977f
AG		 267#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
268 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
1da177e4
LT		 269int sysctl_legacy_va_layout;
270#endif
271
1da177e4
LT		 272/* The default sysctl tables: */
273
de4e83bd 274static struct ctl_table sysctl_base_table[] = {
1da177e4 275 {
1da177e4
LT		 276 .procname = "kernel",
277 .mode = 0555,
278 .child = kern_table,
279 },
280 {
1da177e4
LT		 281 .procname = "vm",
282 .mode = 0555,
283 .child = vm_table,
284 },
1da177e4 285 {
1da177e4
LT		 286 .procname = "fs",
287 .mode = 0555,
288 .child = fs_table,
289 },
290 {
1da177e4
LT		 291 .procname = "debug",
292 .mode = 0555,
293 .child = debug_table,
294 },
295 {
1da177e4
LT		 296 .procname = "dev",
297 .mode = 0555,
298 .child = dev_table,
299 },
6fce56ec 300 { }
1da177e4
LT		 301};
302
77e54a1f 303#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 304static int min_sched_granularity_ns = 100000; /* 100 usecs */
305static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
306static int min_wakeup_granularity_ns; /* 0 usecs */
307static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
cbee9f88 308#ifdef CONFIG_SMP
1983a922
CE		 309static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
310static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
cbee9f88
PZ		 311#endif /* CONFIG_SMP */
312#endif /* CONFIG_SCHED_DEBUG */
77e54a1f 313
5e771905
MG		 314#ifdef CONFIG_COMPACTION
315static int min_extfrag_threshold;
316static int max_extfrag_threshold = 1000;
317#endif
318
d8217f07 319static struct ctl_table kern_table[] = {
2bba22c5 320 {
2bba22c5
MG		 321 .procname = "sched_child_runs_first",
322 .data = &sysctl_sched_child_runs_first,
323 .maxlen = sizeof(unsigned int),
324 .mode = 0644,
6d456111 325 .proc_handler = proc_dointvec,
2bba22c5 326 },
77e54a1f
IM		 327#ifdef CONFIG_SCHED_DEBUG
328 {
b2be5e96
PZ		 329 .procname = "sched_min_granularity_ns",
330 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
702a7c76 333 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 334 .extra1 = &min_sched_granularity_ns,
335 .extra2 = &max_sched_granularity_ns,
77e54a1f 336 },
21805085 337 {
21805085
PZ		 338 .procname = "sched_latency_ns",
339 .data = &sysctl_sched_latency,
340 .maxlen = sizeof(unsigned int),
341 .mode = 0644,
702a7c76 342 .proc_handler = sched_proc_update_handler,
21805085
PZ		 343 .extra1 = &min_sched_granularity_ns,
344 .extra2 = &max_sched_granularity_ns,
345 },
77e54a1f 346 {
77e54a1f
IM		 347 .procname = "sched_wakeup_granularity_ns",
348 .data = &sysctl_sched_wakeup_granularity,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
702a7c76 351 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 352 .extra1 = &min_wakeup_granularity_ns,
353 .extra2 = &max_wakeup_granularity_ns,
354 },
cbee9f88 355#ifdef CONFIG_SMP
1983a922 356 {
1983a922
CE		 357 .procname = "sched_tunable_scaling",
358 .data = &sysctl_sched_tunable_scaling,
359 .maxlen = sizeof(enum sched_tunable_scaling),
360 .mode = 0644,
702a7c76 361 .proc_handler = sched_proc_update_handler,
1983a922
CE		 362 .extra1 = &min_sched_tunable_scaling,
363 .extra2 = &max_sched_tunable_scaling,
2398f2c6 364 },
da84d961 365 {
d00535db 366 .procname = "sched_migration_cost_ns",
da84d961
IM		 367 .data = &sysctl_sched_migration_cost,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
6d456111 370 .proc_handler = proc_dointvec,
da84d961 371 },
b82d9fdd 372 {
b82d9fdd
PZ		 373 .procname = "sched_nr_migrate",
374 .data = &sysctl_sched_nr_migrate,
375 .maxlen = sizeof(unsigned int),
fa85ae24 376 .mode = 0644,
6d456111 377 .proc_handler = proc_dointvec,
fa85ae24 378 },
cb251765
MG		 379#ifdef CONFIG_SCHEDSTATS
380 {
381 .procname = "sched_schedstats",
382 .data = NULL,
383 .maxlen = sizeof(unsigned int),
384 .mode = 0644,
385 .proc_handler = sysctl_schedstats,
eec4844f
MC		 386 .extra1 = SYSCTL_ZERO,
387 .extra2 = SYSCTL_ONE,
cb251765
MG		 388 },
389#endif /* CONFIG_SCHEDSTATS */
cbee9f88
PZ		 390#endif /* CONFIG_SMP */
391#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 392 {
393 .procname = "numa_balancing_scan_delay_ms",
394 .data = &sysctl_numa_balancing_scan_delay,
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec,
398 },
cbee9f88
PZ		 399 {
400 .procname = "numa_balancing_scan_period_min_ms",
401 .data = &sysctl_numa_balancing_scan_period_min,
402 .maxlen = sizeof(unsigned int),
403 .mode = 0644,
404 .proc_handler = proc_dointvec,
405 },
406 {
407 .procname = "numa_balancing_scan_period_max_ms",
408 .data = &sysctl_numa_balancing_scan_period_max,
409 .maxlen = sizeof(unsigned int),
410 .mode = 0644,
411 .proc_handler = proc_dointvec,
412 },
6e5fb223
PZ		 413 {
414 .procname = "numa_balancing_scan_size_mb",
415 .data = &sysctl_numa_balancing_scan_size,
416 .maxlen = sizeof(unsigned int),
417 .mode = 0644,
64192658 418 .proc_handler = proc_dointvec_minmax,
eec4844f 419 .extra1 = SYSCTL_ONE,
6e5fb223 420 },
54a43d54
AK		 421 {
422 .procname = "numa_balancing",
423 .data = NULL, /* filled in by handler */
424 .maxlen = sizeof(unsigned int),
425 .mode = 0644,
426 .proc_handler = sysctl_numa_balancing,
eec4844f
MC		 427 .extra1 = SYSCTL_ZERO,
428 .extra2 = SYSCTL_ONE,
54a43d54 429 },
cbee9f88
PZ		 430#endif /* CONFIG_NUMA_BALANCING */
431#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 432 {
9f0c1e56
PZ		 433 .procname = "sched_rt_period_us",
434 .data = &sysctl_sched_rt_period,
435 .maxlen = sizeof(unsigned int),
436 .mode = 0644,
6d456111 437 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 438 },
439 {
9f0c1e56
PZ		 440 .procname = "sched_rt_runtime_us",
441 .data = &sysctl_sched_rt_runtime,
442 .maxlen = sizeof(int),
443 .mode = 0644,
6d456111 444 .proc_handler = sched_rt_handler,
9f0c1e56 445 },
ce0dbbbb
CW		 446 {
447 .procname = "sched_rr_timeslice_ms",
975e155e 448 .data = &sysctl_sched_rr_timeslice,
ce0dbbbb
CW		 449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = sched_rr_handler,
452 },
e8f14172
PB		 453#ifdef CONFIG_UCLAMP_TASK
454 {
455 .procname = "sched_util_clamp_min",
456 .data = &sysctl_sched_uclamp_util_min,
457 .maxlen = sizeof(unsigned int),
458 .mode = 0644,
459 .proc_handler = sysctl_sched_uclamp_handler,
460 },
461 {
462 .procname = "sched_util_clamp_max",
463 .data = &sysctl_sched_uclamp_util_max,
464 .maxlen = sizeof(unsigned int),
465 .mode = 0644,
466 .proc_handler = sysctl_sched_uclamp_handler,
467 },
468#endif
5091faa4
MG		 469#ifdef CONFIG_SCHED_AUTOGROUP
470 {
471 .procname = "sched_autogroup_enabled",
472 .data = &sysctl_sched_autogroup_enabled,
473 .maxlen = sizeof(unsigned int),
474 .mode = 0644,
1747b21f 475 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 476 .extra1 = SYSCTL_ZERO,
477 .extra2 = SYSCTL_ONE,
5091faa4
MG		 478 },
479#endif
ec12cb7f
PT		 480#ifdef CONFIG_CFS_BANDWIDTH
481 {
482 .procname = "sched_cfs_bandwidth_slice_us",
483 .data = &sysctl_sched_cfs_bandwidth_slice,
484 .maxlen = sizeof(unsigned int),
485 .mode = 0644,
486 .proc_handler = proc_dointvec_minmax,
eec4844f 487 .extra1 = SYSCTL_ONE,
ec12cb7f
PT		 488 },
489#endif
8d5d0cfb
QP		 490#if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
491 {
492 .procname = "sched_energy_aware",
493 .data = &sysctl_sched_energy_aware,
494 .maxlen = sizeof(unsigned int),
495 .mode = 0644,
496 .proc_handler = sched_energy_aware_handler,
eec4844f
MC		 497 .extra1 = SYSCTL_ZERO,
498 .extra2 = SYSCTL_ONE,
8d5d0cfb
QP		 499 },
500#endif
f20786ff
PZ		 501#ifdef CONFIG_PROVE_LOCKING
502 {
f20786ff
PZ		 503 .procname = "prove_locking",
504 .data = &prove_locking,
505 .maxlen = sizeof(int),
506 .mode = 0644,
6d456111 507 .proc_handler = proc_dointvec,
f20786ff
PZ		 508 },
509#endif
510#ifdef CONFIG_LOCK_STAT
511 {
f20786ff
PZ		 512 .procname = "lock_stat",
513 .data = &lock_stat,
514 .maxlen = sizeof(int),
515 .mode = 0644,
6d456111 516 .proc_handler = proc_dointvec,
f20786ff 517 },
77e54a1f 518#endif
1da177e4 519 {
1da177e4
LT		 520 .procname = "panic",
521 .data = &panic_timeout,
522 .maxlen = sizeof(int),
523 .mode = 0644,
6d456111 524 .proc_handler = proc_dointvec,
1da177e4 525 },
046d662f 526#ifdef CONFIG_COREDUMP
1da177e4 527 {
1da177e4
LT		 528 .procname = "core_uses_pid",
529 .data = &core_uses_pid,
530 .maxlen = sizeof(int),
531 .mode = 0644,
6d456111 532 .proc_handler = proc_dointvec,
1da177e4
LT		 533 },
534 {
1da177e4
LT		 535 .procname = "core_pattern",
536 .data = core_pattern,
71ce92f3 537 .maxlen = CORENAME_MAX_SIZE,
1da177e4 538 .mode = 0644,
54b50199 539 .proc_handler = proc_dostring_coredump,
1da177e4 540 },
a293980c 541 {
a293980c
NH		 542 .procname = "core_pipe_limit",
543 .data = &core_pipe_limit,
544 .maxlen = sizeof(unsigned int),
545 .mode = 0644,
6d456111 546 .proc_handler = proc_dointvec,
a293980c 547 },
046d662f 548#endif
34f5a398 549#ifdef CONFIG_PROC_SYSCTL
1da177e4 550 {
1da177e4 551 .procname = "tainted",
25ddbb18 552 .maxlen = sizeof(long),
34f5a398 553 .mode = 0644,
6d456111 554 .proc_handler = proc_taint,
1da177e4 555 },
f4aacea2
KC		 556 {
557 .procname = "sysctl_writes_strict",
558 .data = &sysctl_writes_strict,
559 .maxlen = sizeof(int),
560 .mode = 0644,
561 .proc_handler = proc_dointvec_minmax,
562 .extra1 = &neg_one,
eec4844f 563 .extra2 = SYSCTL_ONE,
f4aacea2 564 },
34f5a398 565#endif
9745512c
AV		 566#ifdef CONFIG_LATENCYTOP
567 {
568 .procname = "latencytop",
569 .data = &latencytop_enabled,
570 .maxlen = sizeof(int),
571 .mode = 0644,
cb251765 572 .proc_handler = sysctl_latencytop,
9745512c
AV		 573 },
574#endif
1da177e4
LT		 575#ifdef CONFIG_BLK_DEV_INITRD
576 {
1da177e4
LT		 577 .procname = "real-root-dev",
578 .data = &real_root_dev,
579 .maxlen = sizeof(int),
580 .mode = 0644,
6d456111 581 .proc_handler = proc_dointvec,
1da177e4
LT		 582 },
583#endif
45807a1d 584 {
45807a1d
IM		 585 .procname = "print-fatal-signals",
586 .data = &print_fatal_signals,
587 .maxlen = sizeof(int),
588 .mode = 0644,
6d456111 589 .proc_handler = proc_dointvec,
45807a1d 590 },
72c57ed5 591#ifdef CONFIG_SPARC
1da177e4 592 {
1da177e4
LT		 593 .procname = "reboot-cmd",
594 .data = reboot_command,
595 .maxlen = 256,
596 .mode = 0644,
6d456111 597 .proc_handler = proc_dostring,
1da177e4
LT		 598 },
599 {
1da177e4
LT		 600 .procname = "stop-a",
601 .data = &stop_a_enabled,
602 .maxlen = sizeof (int),
603 .mode = 0644,
6d456111 604 .proc_handler = proc_dointvec,
1da177e4
LT		 605 },
606 {
1da177e4
LT		 607 .procname = "scons-poweroff",
608 .data = &scons_pwroff,
609 .maxlen = sizeof (int),
610 .mode = 0644,
6d456111 611 .proc_handler = proc_dointvec,
1da177e4
LT		 612 },
613#endif
0871420f
DM		 614#ifdef CONFIG_SPARC64
615 {
0871420f
DM		 616 .procname = "tsb-ratio",
617 .data = &sysctl_tsb_ratio,
618 .maxlen = sizeof (int),
619 .mode = 0644,
6d456111 620 .proc_handler = proc_dointvec,
0871420f
DM		 621 },
622#endif
b67114db 623#ifdef CONFIG_PARISC
1da177e4 624 {
1da177e4
LT		 625 .procname = "soft-power",
626 .data = &pwrsw_enabled,
627 .maxlen = sizeof (int),
628 .mode = 0644,
6d456111 629 .proc_handler = proc_dointvec,
1da177e4 630 },
bf14e3b9
VG		 631#endif
632#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 633 {
1da177e4
LT		 634 .procname = "unaligned-trap",
635 .data = &unaligned_enabled,
636 .maxlen = sizeof (int),
637 .mode = 0644,
6d456111 638 .proc_handler = proc_dointvec,
1da177e4
LT		 639 },
640#endif
641 {
1da177e4
LT		 642 .procname = "ctrl-alt-del",
643 .data = &C_A_D,
644 .maxlen = sizeof(int),
645 .mode = 0644,
6d456111 646 .proc_handler = proc_dointvec,
1da177e4 647 },
606576ce 648#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 649 {
b0fc494f
SR		 650 .procname = "ftrace_enabled",
651 .data = &ftrace_enabled,
652 .maxlen = sizeof(int),
653 .mode = 0644,
6d456111 654 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 655 },
656#endif
f38f1d2a
SR		 657#ifdef CONFIG_STACK_TRACER
658 {
f38f1d2a
SR		 659 .procname = "stack_tracer_enabled",
660 .data = &stack_tracer_enabled,
661 .maxlen = sizeof(int),
662 .mode = 0644,
6d456111 663 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 664 },
665#endif
944ac425
SR		 666#ifdef CONFIG_TRACING
667 {
3299b4dd 668 .procname = "ftrace_dump_on_oops",
944ac425
SR		 669 .data = &ftrace_dump_on_oops,
670 .maxlen = sizeof(int),
671 .mode = 0644,
6d456111 672 .proc_handler = proc_dointvec,
944ac425 673 },
de7edd31
SRRH		 674 {
675 .procname = "traceoff_on_warning",
676 .data = &__disable_trace_on_warning,
677 .maxlen = sizeof(__disable_trace_on_warning),
678 .mode = 0644,
679 .proc_handler = proc_dointvec,
680 },
0daa2302
SRRH		 681 {
682 .procname = "tracepoint_printk",
683 .data = &tracepoint_printk,
684 .maxlen = sizeof(tracepoint_printk),
685 .mode = 0644,
42391745 686 .proc_handler = tracepoint_printk_sysctl,
0daa2302 687 },
944ac425 688#endif
2965faa5 689#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 690 {
691 .procname = "kexec_load_disabled",
692 .data = &kexec_load_disabled,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 /* only handle a transition from default "0" to "1" */
696 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 697 .extra1 = SYSCTL_ONE,
698 .extra2 = SYSCTL_ONE,
7984754b
KC		 699 },
700#endif
a1ef5adb 701#ifdef CONFIG_MODULES
1da177e4 702 {
1da177e4
LT		 703 .procname = "modprobe",
704 .data = &modprobe_path,
705 .maxlen = KMOD_PATH_LEN,
706 .mode = 0644,
6d456111 707 .proc_handler = proc_dostring,
1da177e4 708 },
3d43321b 709 {
3d43321b
KC		 710 .procname = "modules_disabled",
711 .data = &modules_disabled,
712 .maxlen = sizeof(int),
713 .mode = 0644,
714 /* only handle a transition from default "0" to "1" */
6d456111 715 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 716 .extra1 = SYSCTL_ONE,
717 .extra2 = SYSCTL_ONE,
3d43321b 718 },
1da177e4 719#endif
86d56134 720#ifdef CONFIG_UEVENT_HELPER
1da177e4 721 {
1da177e4 722 .procname = "hotplug",
312c004d
KS		 723 .data = &uevent_helper,
724 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 725 .mode = 0644,
6d456111 726 .proc_handler = proc_dostring,
1da177e4 727 },
86d56134 728#endif
1da177e4
LT		 729#ifdef CONFIG_CHR_DEV_SG
730 {
1da177e4
LT		 731 .procname = "sg-big-buff",
732 .data = &sg_big_buff,
733 .maxlen = sizeof (int),
734 .mode = 0444,
6d456111 735 .proc_handler = proc_dointvec,
1da177e4
LT		 736 },
737#endif
738#ifdef CONFIG_BSD_PROCESS_ACCT
739 {
1da177e4
LT		 740 .procname = "acct",
741 .data = &acct_parm,
742 .maxlen = 3*sizeof(int),
743 .mode = 0644,
6d456111 744 .proc_handler = proc_dointvec,
1da177e4
LT		 745 },
746#endif
1da177e4
LT		 747#ifdef CONFIG_MAGIC_SYSRQ
748 {
1da177e4 749 .procname = "sysrq",
5d6f647f 750 .data = &__sysrq_enabled,
1da177e4
LT		 751 .maxlen = sizeof (int),
752 .mode = 0644,
97f5f0cd 753 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 754 },
755#endif
d6f8ff73 756#ifdef CONFIG_PROC_SYSCTL
1da177e4 757 {
1da177e4 758 .procname = "cad_pid",
9ec52099 759 .data = NULL,
1da177e4
LT		 760 .maxlen = sizeof (int),
761 .mode = 0600,
6d456111 762 .proc_handler = proc_do_cad_pid,
1da177e4 763 },
d6f8ff73 764#endif
1da177e4 765 {
1da177e4 766 .procname = "threads-max",
16db3d3f 767 .data = NULL,
1da177e4
LT		 768 .maxlen = sizeof(int),
769 .mode = 0644,
16db3d3f 770 .proc_handler = sysctl_max_threads,
1da177e4
LT		 771 },
772 {
1da177e4
LT		 773 .procname = "random",
774 .mode = 0555,
775 .child = random_table,
776 },
17f60a7d
EP		 777 {
778 .procname = "usermodehelper",
779 .mode = 0555,
780 .child = usermodehelper_table,
781 },
ceb18132
LR		 782#ifdef CONFIG_FW_LOADER_USER_HELPER
783 {
784 .procname = "firmware_config",
785 .mode = 0555,
786 .child = firmware_config_table,
787 },
788#endif
1da177e4 789 {
1da177e4
LT		 790 .procname = "overflowuid",
791 .data = &overflowuid,
792 .maxlen = sizeof(int),
793 .mode = 0644,
6d456111 794 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 795 .extra1 = &minolduid,
796 .extra2 = &maxolduid,
797 },
798 {
1da177e4
LT		 799 .procname = "overflowgid",
800 .data = &overflowgid,
801 .maxlen = sizeof(int),
802 .mode = 0644,
6d456111 803 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 804 .extra1 = &minolduid,
805 .extra2 = &maxolduid,
806 },
347a8dc3 807#ifdef CONFIG_S390
1da177e4
LT		 808#ifdef CONFIG_MATHEMU
809 {
1da177e4
LT		 810 .procname = "ieee_emulation_warnings",
811 .data = &sysctl_ieee_emulation_warnings,
812 .maxlen = sizeof(int),
813 .mode = 0644,
6d456111 814 .proc_handler = proc_dointvec,
1da177e4 815 },
1da177e4
LT		 816#endif
817 {
1da177e4 818 .procname = "userprocess_debug",
ab3c68ee 819 .data = &show_unhandled_signals,
1da177e4
LT		 820 .maxlen = sizeof(int),
821 .mode = 0644,
6d456111 822 .proc_handler = proc_dointvec,
1da177e4
LT		 823 },
824#endif
825 {
1da177e4
LT		 826 .procname = "pid_max",
827 .data = &pid_max,
828 .maxlen = sizeof (int),
829 .mode = 0644,
6d456111 830 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 831 .extra1 = &pid_max_min,
832 .extra2 = &pid_max_max,
833 },
834 {
1da177e4
LT		 835 .procname = "panic_on_oops",
836 .data = &panic_on_oops,
837 .maxlen = sizeof(int),
838 .mode = 0644,
6d456111 839 .proc_handler = proc_dointvec,
1da177e4 840 },
81c9d43f
FT		 841 {
842 .procname = "panic_print",
843 .data = &panic_print,
844 .maxlen = sizeof(unsigned long),
845 .mode = 0644,
846 .proc_handler = proc_doulongvec_minmax,
847 },
7ef3d2fd
JP		 848#if defined CONFIG_PRINTK
849 {
7ef3d2fd
JP		 850 .procname = "printk",
851 .data = &console_loglevel,
852 .maxlen = 4*sizeof(int),
853 .mode = 0644,
6d456111 854 .proc_handler = proc_dointvec,
7ef3d2fd 855 },
1da177e4 856 {
1da177e4 857 .procname = "printk_ratelimit",
717115e1 858 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 859 .maxlen = sizeof(int),
860 .mode = 0644,
6d456111 861 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 862 },
863 {
1da177e4 864 .procname = "printk_ratelimit_burst",
717115e1 865 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 866 .maxlen = sizeof(int),
867 .mode = 0644,
6d456111 868 .proc_handler = proc_dointvec,
1da177e4 869 },
af91322e 870 {
af91322e
DY		 871 .procname = "printk_delay",
872 .data = &printk_delay_msec,
873 .maxlen = sizeof(int),
874 .mode = 0644,
6d456111 875 .proc_handler = proc_dointvec_minmax,
eec4844f 876 .extra1 = SYSCTL_ZERO,
af91322e
DY		 877 .extra2 = &ten_thousand,
878 },
750afe7b
BP		 879 {
880 .procname = "printk_devkmsg",
881 .data = devkmsg_log_str,
882 .maxlen = DEVKMSG_STR_MAX_SIZE,
883 .mode = 0644,
884 .proc_handler = devkmsg_sysctl_set_loglvl,
885 },
eaf06b24
DR		 886 {
887 .procname = "dmesg_restrict",
888 .data = &dmesg_restrict,
889 .maxlen = sizeof(int),
890 .mode = 0644,
620f6e8e 891 .proc_handler = proc_dointvec_minmax_sysadmin,
eec4844f
MC		 892 .extra1 = SYSCTL_ZERO,
893 .extra2 = SYSCTL_ONE,
eaf06b24 894 },
455cd5ab
DR		 895 {
896 .procname = "kptr_restrict",
897 .data = &kptr_restrict,
898 .maxlen = sizeof(int),
899 .mode = 0644,
620f6e8e 900 .proc_handler = proc_dointvec_minmax_sysadmin,
eec4844f 901 .extra1 = SYSCTL_ZERO,
455cd5ab
DR		 902 .extra2 = &two,
903 },
df6e61d4 904#endif
1da177e4 905 {
1da177e4
LT		 906 .procname = "ngroups_max",
907 .data = &ngroups_max,
908 .maxlen = sizeof (int),
909 .mode = 0444,
6d456111 910 .proc_handler = proc_dointvec,
1da177e4 911 },
73efc039
DB		 912 {
913 .procname = "cap_last_cap",
914 .data = (void *)&cap_last_cap,
915 .maxlen = sizeof(int),
916 .mode = 0444,
917 .proc_handler = proc_dointvec,
918 },
58687acb 919#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 920 {
58687acb 921 .procname = "watchdog",
7feeb9cd
TG		 922 .data = &watchdog_user_enabled,
923 .maxlen = sizeof(int),
924 .mode = 0644,
195daf66 925 .proc_handler = proc_watchdog,
eec4844f
MC		 926 .extra1 = SYSCTL_ZERO,
927 .extra2 = SYSCTL_ONE,
58687acb
DZ		 928 },
929 {
930 .procname = "watchdog_thresh",
586692a5 931 .data = &watchdog_thresh,
58687acb
DZ		 932 .maxlen = sizeof(int),
933 .mode = 0644,
195daf66 934 .proc_handler = proc_watchdog_thresh,
eec4844f 935 .extra1 = SYSCTL_ZERO,
58687acb 936 .extra2 = &sixty,
504d7cf1 937 },
195daf66
UO		 938 {
939 .procname = "nmi_watchdog",
7feeb9cd
TG		 940 .data = &nmi_watchdog_user_enabled,
941 .maxlen = sizeof(int),
51d4052b 942 .mode = NMI_WATCHDOG_SYSCTL_PERM,
195daf66 943 .proc_handler = proc_nmi_watchdog,
eec4844f
MC		 944 .extra1 = SYSCTL_ZERO,
945 .extra2 = SYSCTL_ONE,
195daf66 946 },
05a4a952
NP		 947 {
948 .procname = "watchdog_cpumask",
949 .data = &watchdog_cpumask_bits,
950 .maxlen = NR_CPUS,
951 .mode = 0644,
952 .proc_handler = proc_watchdog_cpumask,
953 },
954#ifdef CONFIG_SOFTLOCKUP_DETECTOR
195daf66
UO		 955 {
956 .procname = "soft_watchdog",
7feeb9cd
TG		 957 .data = &soft_watchdog_user_enabled,
958 .maxlen = sizeof(int),
959 .mode = 0644,
195daf66 960 .proc_handler = proc_soft_watchdog,
eec4844f
MC		 961 .extra1 = SYSCTL_ZERO,
962 .extra2 = SYSCTL_ONE,
195daf66 963 },
2508ce18
DZ		 964 {
965 .procname = "softlockup_panic",
966 .data = &softlockup_panic,
967 .maxlen = sizeof(int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 970 .extra1 = SYSCTL_ZERO,
971 .extra2 = SYSCTL_ONE,
2508ce18 972 },
05a4a952 973#ifdef CONFIG_SMP
ac1f5912 974 {
05a4a952
NP		 975 .procname = "softlockup_all_cpu_backtrace",
976 .data = &sysctl_softlockup_all_cpu_backtrace,
ac1f5912
DZ		 977 .maxlen = sizeof(int),
978 .mode = 0644,
979 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 980 .extra1 = SYSCTL_ZERO,
981 .extra2 = SYSCTL_ONE,
ac1f5912 982 },
05a4a952 983#endif /* CONFIG_SMP */
ac1f5912 984#endif
05a4a952 985#ifdef CONFIG_HARDLOCKUP_DETECTOR
ed235875 986 {
05a4a952
NP		 987 .procname = "hardlockup_panic",
988 .data = &hardlockup_panic,
ed235875
AT		 989 .maxlen = sizeof(int),
990 .mode = 0644,
991 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 992 .extra1 = SYSCTL_ZERO,
993 .extra2 = SYSCTL_ONE,
ed235875 994 },
05a4a952 995#ifdef CONFIG_SMP
55537871
JK		 996 {
997 .procname = "hardlockup_all_cpu_backtrace",
998 .data = &sysctl_hardlockup_all_cpu_backtrace,
999 .maxlen = sizeof(int),
1000 .mode = 0644,
1001 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1002 .extra1 = SYSCTL_ZERO,
1003 .extra2 = SYSCTL_ONE,
55537871 1004 },
ed235875 1005#endif /* CONFIG_SMP */
5dc30558 1006#endif
05a4a952
NP		 1007#endif
1008
5dc30558
DZ		 1009#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1010 {
1011 .procname = "unknown_nmi_panic",
1012 .data = &unknown_nmi_panic,
1013 .maxlen = sizeof (int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec,
1016 },
504d7cf1 1017#endif
1da177e4 1018#if defined(CONFIG_X86)
8da5adda 1019 {
8da5adda
DZ		 1020 .procname = "panic_on_unrecovered_nmi",
1021 .data = &panic_on_unrecovered_nmi,
1022 .maxlen = sizeof(int),
1023 .mode = 0644,
6d456111 1024 .proc_handler = proc_dointvec,
8da5adda 1025 },
5211a242 1026 {
5211a242
KG		 1027 .procname = "panic_on_io_nmi",
1028 .data = &panic_on_io_nmi,
1029 .maxlen = sizeof(int),
1030 .mode = 0644,
6d456111 1031 .proc_handler = proc_dointvec,
5211a242 1032 },
55af7796
MH		 1033#ifdef CONFIG_DEBUG_STACKOVERFLOW
1034 {
1035 .procname = "panic_on_stackoverflow",
1036 .data = &sysctl_panic_on_stackoverflow,
1037 .maxlen = sizeof(int),
1038 .mode = 0644,
1039 .proc_handler = proc_dointvec,
1040 },
1041#endif
1da177e4 1042 {
1da177e4
LT		 1043 .procname = "bootloader_type",
1044 .data = &bootloader_type,
1045 .maxlen = sizeof (int),
1046 .mode = 0444,
6d456111 1047 .proc_handler = proc_dointvec,
1da177e4 1048 },
5031296c 1049 {
5031296c
PA		 1050 .procname = "bootloader_version",
1051 .data = &bootloader_version,
1052 .maxlen = sizeof (int),
1053 .mode = 0444,
6d456111 1054 .proc_handler = proc_dointvec,
5031296c 1055 },
6e7c4025 1056 {
6e7c4025
IM		 1057 .procname = "io_delay_type",
1058 .data = &io_delay_type,
1059 .maxlen = sizeof(int),
1060 .mode = 0644,
6d456111 1061 .proc_handler = proc_dointvec,
6e7c4025 1062 },
1da177e4 1063#endif
7a9166e3 1064#if defined(CONFIG_MMU)
1da177e4 1065 {
1da177e4
LT		 1066 .procname = "randomize_va_space",
1067 .data = &randomize_va_space,
1068 .maxlen = sizeof(int),
1069 .mode = 0644,
6d456111 1070 .proc_handler = proc_dointvec,
1da177e4 1071 },
7a9166e3 1072#endif
0152fb37 1073#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1074 {
951f22d5
MS		 1075 .procname = "spin_retry",
1076 .data = &spin_retry,
1077 .maxlen = sizeof (int),
1078 .mode = 0644,
6d456111 1079 .proc_handler = proc_dointvec,
951f22d5 1080 },
c255d844 1081#endif
673d5b43 1082#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1083 {
c255d844 1084 .procname = "acpi_video_flags",
77afcf78 1085 .data = &acpi_realmode_flags,
c255d844
PM		 1086 .maxlen = sizeof (unsigned long),
1087 .mode = 0644,
6d456111 1088 .proc_handler = proc_doulongvec_minmax,
c255d844 1089 },
d2b176ed 1090#endif
b6fca725 1091#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1092 {
d2b176ed
JS		 1093 .procname = "ignore-unaligned-usertrap",
1094 .data = &no_unaligned_warning,
1095 .maxlen = sizeof (int),
1096 .mode = 0644,
6d456111 1097 .proc_handler = proc_dointvec,
d2b176ed 1098 },
b6fca725
VG		 1099#endif
1100#ifdef CONFIG_IA64
88fc241f 1101 {
88fc241f
DC		 1102 .procname = "unaligned-dump-stack",
1103 .data = &unaligned_dump_stack,
1104 .maxlen = sizeof (int),
1105 .mode = 0644,
6d456111 1106 .proc_handler = proc_dointvec,
88fc241f 1107 },
bebfa101 1108#endif
e162b39a
MSB		 1109#ifdef CONFIG_DETECT_HUNG_TASK
1110 {
e162b39a
MSB		 1111 .procname = "hung_task_panic",
1112 .data = &sysctl_hung_task_panic,
1113 .maxlen = sizeof(int),
1114 .mode = 0644,
6d456111 1115 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1116 .extra1 = SYSCTL_ZERO,
1117 .extra2 = SYSCTL_ONE,
e162b39a 1118 },
82a1fcb9 1119 {
82a1fcb9
IM		 1120 .procname = "hung_task_check_count",
1121 .data = &sysctl_hung_task_check_count,
cd64647f 1122 .maxlen = sizeof(int),
82a1fcb9 1123 .mode = 0644,
cd64647f 1124 .proc_handler = proc_dointvec_minmax,
eec4844f 1125 .extra1 = SYSCTL_ZERO,
82a1fcb9
IM		 1126 },
1127 {
82a1fcb9
IM		 1128 .procname = "hung_task_timeout_secs",
1129 .data = &sysctl_hung_task_timeout_secs,
90739081 1130 .maxlen = sizeof(unsigned long),
82a1fcb9 1131 .mode = 0644,
6d456111 1132 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1133 .extra2 = &hung_task_timeout_max,
82a1fcb9 1134 },
a2e51445
DV		 1135 {
1136 .procname = "hung_task_check_interval_secs",
1137 .data = &sysctl_hung_task_check_interval_secs,
1138 .maxlen = sizeof(unsigned long),
1139 .mode = 0644,
1140 .proc_handler = proc_dohung_task_timeout_secs,
1141 .extra2 = &hung_task_timeout_max,
1142 },
82a1fcb9 1143 {
82a1fcb9
IM		 1144 .procname = "hung_task_warnings",
1145 .data = &sysctl_hung_task_warnings,
270750db 1146 .maxlen = sizeof(int),
82a1fcb9 1147 .mode = 0644,
270750db
AT		 1148 .proc_handler = proc_dointvec_minmax,
1149 .extra1 = &neg_one,
82a1fcb9 1150 },
c4f3b63f 1151#endif
23f78d4a
IM		 1152#ifdef CONFIG_RT_MUTEXES
1153 {
23f78d4a
IM		 1154 .procname = "max_lock_depth",
1155 .data = &max_lock_depth,
1156 .maxlen = sizeof(int),
1157 .mode = 0644,
6d456111 1158 .proc_handler = proc_dointvec,
23f78d4a 1159 },
5096add8 1160#endif
10a0a8d4 1161 {
10a0a8d4
JF		 1162 .procname = "poweroff_cmd",
1163 .data = &poweroff_cmd,
1164 .maxlen = POWEROFF_CMD_PATH_LEN,
1165 .mode = 0644,
6d456111 1166 .proc_handler = proc_dostring,
10a0a8d4 1167 },
0b77f5bf
DH		 1168#ifdef CONFIG_KEYS
1169 {
0b77f5bf
DH		 1170 .procname = "keys",
1171 .mode = 0555,
1172 .child = key_sysctls,
1173 },
1174#endif
cdd6c482 1175#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1176 /*
1177 * User-space scripts rely on the existence of this file
1178 * as a feature check for perf_events being enabled.
1179 *
1180 * So it's an ABI, do not remove!
1181 */
1ccd1549 1182 {
cdd6c482
IM		 1183 .procname = "perf_event_paranoid",
1184 .data = &sysctl_perf_event_paranoid,
1185 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1186 .mode = 0644,
6d456111 1187 .proc_handler = proc_dointvec,
1ccd1549 1188 },
c5078f78 1189 {
cdd6c482
IM		 1190 .procname = "perf_event_mlock_kb",
1191 .data = &sysctl_perf_event_mlock,
1192 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1193 .mode = 0644,
6d456111 1194 .proc_handler = proc_dointvec,
c5078f78 1195 },
a78ac325 1196 {
cdd6c482
IM		 1197 .procname = "perf_event_max_sample_rate",
1198 .data = &sysctl_perf_event_sample_rate,
1199 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1200 .mode = 0644,
163ec435 1201 .proc_handler = perf_proc_update_handler,
eec4844f 1202 .extra1 = SYSCTL_ONE,
a78ac325 1203 },
14c63f17
DH		 1204 {
1205 .procname = "perf_cpu_time_max_percent",
1206 .data = &sysctl_perf_cpu_time_max_percent,
1207 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1208 .mode = 0644,
1209 .proc_handler = perf_cpu_time_max_percent_handler,
eec4844f 1210 .extra1 = SYSCTL_ZERO,
14c63f17
DH		 1211 .extra2 = &one_hundred,
1212 },
c5dfd78e
ACM		 1213 {
1214 .procname = "perf_event_max_stack",
a831100a 1215 .data = &sysctl_perf_event_max_stack,
c5dfd78e
ACM		 1216 .maxlen = sizeof(sysctl_perf_event_max_stack),
1217 .mode = 0644,
1218 .proc_handler = perf_event_max_stack_handler,
eec4844f 1219 .extra1 = SYSCTL_ZERO,
c5dfd78e
ACM		 1220 .extra2 = &six_hundred_forty_kb,
1221 },
c85b0334
ACM		 1222 {
1223 .procname = "perf_event_max_contexts_per_stack",
1224 .data = &sysctl_perf_event_max_contexts_per_stack,
1225 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1226 .mode = 0644,
1227 .proc_handler = perf_event_max_stack_handler,
eec4844f 1228 .extra1 = SYSCTL_ZERO,
c85b0334
ACM		 1229 .extra2 = &one_thousand,
1230 },
cb684b5b 1231#endif
9e3961a0
PB		 1232 {
1233 .procname = "panic_on_warn",
1234 .data = &panic_on_warn,
1235 .maxlen = sizeof(int),
1236 .mode = 0644,
1237 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1238 .extra1 = SYSCTL_ZERO,
1239 .extra2 = SYSCTL_ONE,
9e3961a0 1240 },
bc7a34b8
TG		 1241#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1242 {
1243 .procname = "timer_migration",
1244 .data = &sysctl_timer_migration,
1245 .maxlen = sizeof(unsigned int),
1246 .mode = 0644,
1247 .proc_handler = timer_migration_handler,
eec4844f
MC		 1248 .extra1 = SYSCTL_ZERO,
1249 .extra2 = SYSCTL_ONE,
bc7a34b8 1250 },
1be7f75d
AS		 1251#endif
1252#ifdef CONFIG_BPF_SYSCALL
1253 {
1254 .procname = "unprivileged_bpf_disabled",
1255 .data = &sysctl_unprivileged_bpf_disabled,
1256 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1257 .mode = 0644,
1258 /* only handle a transition from default "0" to "1" */
1259 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1260 .extra1 = SYSCTL_ONE,
1261 .extra2 = SYSCTL_ONE,
1be7f75d 1262 },
492ecee8
AS		 1263 {
1264 .procname = "bpf_stats_enabled",
a8e11e5c
ED		 1265 .data = &bpf_stats_enabled_key.key,
1266 .maxlen = sizeof(bpf_stats_enabled_key),
492ecee8 1267 .mode = 0644,
a8e11e5c 1268 .proc_handler = proc_do_static_key,
492ecee8 1269 },
3fcc5530 1270#endif
088e9d25
DBO		 1271#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1272 {
1273 .procname = "panic_on_rcu_stall",
1274 .data = &sysctl_panic_on_rcu_stall,
1275 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1276 .mode = 0644,
1277 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1278 .extra1 = SYSCTL_ZERO,
1279 .extra2 = SYSCTL_ONE,
088e9d25 1280 },
964c9dff
AP		 1281#endif
1282#ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1283 {
1284 .procname = "stack_erasing",
1285 .data = NULL,
1286 .maxlen = sizeof(int),
1287 .mode = 0600,
1288 .proc_handler = stack_erasing_sysctl,
eec4844f
MC		 1289 .extra1 = SYSCTL_ZERO,
1290 .extra2 = SYSCTL_ONE,
964c9dff 1291 },
bc7a34b8 1292#endif
6fce56ec 1293 { }
1da177e4
LT		 1294};
1295
d8217f07 1296static struct ctl_table vm_table[] = {
1da177e4 1297 {
1da177e4
LT		 1298 .procname = "overcommit_memory",
1299 .data = &sysctl_overcommit_memory,
1300 .maxlen = sizeof(sysctl_overcommit_memory),
1301 .mode = 0644,
cb16e95f 1302 .proc_handler = proc_dointvec_minmax,
eec4844f 1303 .extra1 = SYSCTL_ZERO,
cb16e95f 1304 .extra2 = &two,
1da177e4 1305 },
fadd8fbd 1306 {
fadd8fbd
KH		 1307 .procname = "panic_on_oom",
1308 .data = &sysctl_panic_on_oom,
1309 .maxlen = sizeof(sysctl_panic_on_oom),
1310 .mode = 0644,
cb16e95f 1311 .proc_handler = proc_dointvec_minmax,
eec4844f 1312 .extra1 = SYSCTL_ZERO,
cb16e95f 1313 .extra2 = &two,
fadd8fbd 1314 },
fe071d7e 1315 {
fe071d7e
DR		 1316 .procname = "oom_kill_allocating_task",
1317 .data = &sysctl_oom_kill_allocating_task,
1318 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1319 .mode = 0644,
6d456111 1320 .proc_handler = proc_dointvec,
fe071d7e 1321 },
fef1bdd6 1322 {
fef1bdd6
DR		 1323 .procname = "oom_dump_tasks",
1324 .data = &sysctl_oom_dump_tasks,
1325 .maxlen = sizeof(sysctl_oom_dump_tasks),
1326 .mode = 0644,
6d456111 1327 .proc_handler = proc_dointvec,
fef1bdd6 1328 },
1da177e4 1329 {
1da177e4
LT		 1330 .procname = "overcommit_ratio",
1331 .data = &sysctl_overcommit_ratio,
1332 .maxlen = sizeof(sysctl_overcommit_ratio),
1333 .mode = 0644,
49f0ce5f
JM		 1334 .proc_handler = overcommit_ratio_handler,
1335 },
1336 {
1337 .procname = "overcommit_kbytes",
1338 .data = &sysctl_overcommit_kbytes,
1339 .maxlen = sizeof(sysctl_overcommit_kbytes),
1340 .mode = 0644,
1341 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1342 },
1343 {
1da177e4
LT		 1344 .procname = "page-cluster",
1345 .data = &page_cluster,
1346 .maxlen = sizeof(int),
1347 .mode = 0644,
cb16e95f 1348 .proc_handler = proc_dointvec_minmax,
eec4844f 1349 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1350 },
1351 {
1da177e4
LT		 1352 .procname = "dirty_background_ratio",
1353 .data = &dirty_background_ratio,
1354 .maxlen = sizeof(dirty_background_ratio),
1355 .mode = 0644,
6d456111 1356 .proc_handler = dirty_background_ratio_handler,
eec4844f 1357 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1358 .extra2 = &one_hundred,
1359 },
2da02997 1360 {
2da02997
DR		 1361 .procname = "dirty_background_bytes",
1362 .data = &dirty_background_bytes,
1363 .maxlen = sizeof(dirty_background_bytes),
1364 .mode = 0644,
6d456111 1365 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1366 .extra1 = &one_ul,
2da02997 1367 },
1da177e4 1368 {
1da177e4
LT		 1369 .procname = "dirty_ratio",
1370 .data = &vm_dirty_ratio,
1371 .maxlen = sizeof(vm_dirty_ratio),
1372 .mode = 0644,
6d456111 1373 .proc_handler = dirty_ratio_handler,
eec4844f 1374 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1375 .extra2 = &one_hundred,
1376 },
2da02997 1377 {
2da02997
DR		 1378 .procname = "dirty_bytes",
1379 .data = &vm_dirty_bytes,
1380 .maxlen = sizeof(vm_dirty_bytes),
1381 .mode = 0644,
6d456111 1382 .proc_handler = dirty_bytes_handler,
9e4a5bda 1383 .extra1 = &dirty_bytes_min,
2da02997 1384 },
1da177e4 1385 {
1da177e4 1386 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1387 .data = &dirty_writeback_interval,
1388 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1389 .mode = 0644,
6d456111 1390 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1391 },
1392 {
1da177e4 1393 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1394 .data = &dirty_expire_interval,
1395 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1396 .mode = 0644,
cb16e95f 1397 .proc_handler = proc_dointvec_minmax,
eec4844f 1398 .extra1 = SYSCTL_ZERO,
1da177e4 1399 },
1efff914
TT		 1400 {
1401 .procname = "dirtytime_expire_seconds",
1402 .data = &dirtytime_expire_interval,
2d87b309 1403 .maxlen = sizeof(dirtytime_expire_interval),
1efff914
TT		 1404 .mode = 0644,
1405 .proc_handler = dirtytime_interval_handler,
eec4844f 1406 .extra1 = SYSCTL_ZERO,
1efff914 1407 },
1da177e4 1408 {
1da177e4
LT		 1409 .procname = "swappiness",
1410 .data = &vm_swappiness,
1411 .maxlen = sizeof(vm_swappiness),
1412 .mode = 0644,
6d456111 1413 .proc_handler = proc_dointvec_minmax,
eec4844f 1414 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1415 .extra2 = &one_hundred,
1416 },
1417#ifdef CONFIG_HUGETLB_PAGE
06808b08 1418 {
1da177e4 1419 .procname = "nr_hugepages",
e5ff2159 1420 .data = NULL,
1da177e4
LT		 1421 .maxlen = sizeof(unsigned long),
1422 .mode = 0644,
6d456111 1423 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1424 },
1425#ifdef CONFIG_NUMA
1426 {
1427 .procname = "nr_hugepages_mempolicy",
1428 .data = NULL,
1429 .maxlen = sizeof(unsigned long),
1430 .mode = 0644,
1431 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08 1432 },
4518085e
KW		 1433 {
1434 .procname = "numa_stat",
1435 .data = &sysctl_vm_numa_stat,
1436 .maxlen = sizeof(int),
1437 .mode = 0644,
1438 .proc_handler = sysctl_vm_numa_stat_handler,
eec4844f
MC		 1439 .extra1 = SYSCTL_ZERO,
1440 .extra2 = SYSCTL_ONE,
4518085e 1441 },
06808b08 1442#endif
1da177e4 1443 {
1da177e4
LT		 1444 .procname = "hugetlb_shm_group",
1445 .data = &sysctl_hugetlb_shm_group,
1446 .maxlen = sizeof(gid_t),
1447 .mode = 0644,
6d456111 1448 .proc_handler = proc_dointvec,
1da177e4 1449 },
d1c3fb1f 1450 {
d1c3fb1f 1451 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1452 .data = NULL,
1453 .maxlen = sizeof(unsigned long),
d1c3fb1f 1454 .mode = 0644,
6d456111 1455 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1456 },
1da177e4
LT		 1457#endif
1458 {
1da177e4
LT		 1459 .procname = "lowmem_reserve_ratio",
1460 .data = &sysctl_lowmem_reserve_ratio,
1461 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1462 .mode = 0644,
6d456111 1463 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1464 },
9d0243bc 1465 {
9d0243bc
AM		 1466 .procname = "drop_caches",
1467 .data = &sysctl_drop_caches,
1468 .maxlen = sizeof(int),
1469 .mode = 0644,
1470 .proc_handler = drop_caches_sysctl_handler,
eec4844f 1471 .extra1 = SYSCTL_ONE,
5509a5d2 1472 .extra2 = &four,
9d0243bc 1473 },
76ab0f53
MG		 1474#ifdef CONFIG_COMPACTION
1475 {
1476 .procname = "compact_memory",
1477 .data = &sysctl_compact_memory,
1478 .maxlen = sizeof(int),
1479 .mode = 0200,
1480 .proc_handler = sysctl_compaction_handler,
1481 },
5e771905
MG		 1482 {
1483 .procname = "extfrag_threshold",
1484 .data = &sysctl_extfrag_threshold,
1485 .maxlen = sizeof(int),
1486 .mode = 0644,
6b7e5cad 1487 .proc_handler = proc_dointvec_minmax,
5e771905
MG		 1488 .extra1 = &min_extfrag_threshold,
1489 .extra2 = &max_extfrag_threshold,
1490 },
5bbe3547
EM		 1491 {
1492 .procname = "compact_unevictable_allowed",
1493 .data = &sysctl_compact_unevictable_allowed,
1494 .maxlen = sizeof(int),
1495 .mode = 0644,
1496 .proc_handler = proc_dointvec,
eec4844f
MC		 1497 .extra1 = SYSCTL_ZERO,
1498 .extra2 = SYSCTL_ONE,
5bbe3547 1499 },
5e771905 1500
76ab0f53 1501#endif /* CONFIG_COMPACTION */
1da177e4 1502 {
1da177e4
LT		 1503 .procname = "min_free_kbytes",
1504 .data = &min_free_kbytes,
1505 .maxlen = sizeof(min_free_kbytes),
1506 .mode = 0644,
6d456111 1507 .proc_handler = min_free_kbytes_sysctl_handler,
eec4844f 1508 .extra1 = SYSCTL_ZERO,
1da177e4 1509 },
1c30844d
MG		 1510 {
1511 .procname = "watermark_boost_factor",
1512 .data = &watermark_boost_factor,
1513 .maxlen = sizeof(watermark_boost_factor),
1514 .mode = 0644,
1515 .proc_handler = watermark_boost_factor_sysctl_handler,
eec4844f 1516 .extra1 = SYSCTL_ZERO,
1c30844d 1517 },
795ae7a0
JW		 1518 {
1519 .procname = "watermark_scale_factor",
1520 .data = &watermark_scale_factor,
1521 .maxlen = sizeof(watermark_scale_factor),
1522 .mode = 0644,
1523 .proc_handler = watermark_scale_factor_sysctl_handler,
eec4844f 1524 .extra1 = SYSCTL_ONE,
795ae7a0
JW		 1525 .extra2 = &one_thousand,
1526 },
8ad4b1fb 1527 {
8ad4b1fb
RS		 1528 .procname = "percpu_pagelist_fraction",
1529 .data = &percpu_pagelist_fraction,
1530 .maxlen = sizeof(percpu_pagelist_fraction),
1531 .mode = 0644,
6d456111 1532 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
eec4844f 1533 .extra1 = SYSCTL_ZERO,
8ad4b1fb 1534 },
1da177e4
LT		 1535#ifdef CONFIG_MMU
1536 {
1da177e4
LT		 1537 .procname = "max_map_count",
1538 .data = &sysctl_max_map_count,
1539 .maxlen = sizeof(sysctl_max_map_count),
1540 .mode = 0644,
3e26120c 1541 .proc_handler = proc_dointvec_minmax,
eec4844f 1542 .extra1 = SYSCTL_ZERO,
1da177e4 1543 },
dd8632a1
PM		 1544#else
1545 {
dd8632a1
PM		 1546 .procname = "nr_trim_pages",
1547 .data = &sysctl_nr_trim_pages,
1548 .maxlen = sizeof(sysctl_nr_trim_pages),
1549 .mode = 0644,
6d456111 1550 .proc_handler = proc_dointvec_minmax,
eec4844f 1551 .extra1 = SYSCTL_ZERO,
dd8632a1 1552 },
1da177e4
LT		 1553#endif
1554 {
1da177e4
LT		 1555 .procname = "laptop_mode",
1556 .data = &laptop_mode,
1557 .maxlen = sizeof(laptop_mode),
1558 .mode = 0644,
6d456111 1559 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1560 },
1561 {
1da177e4
LT		 1562 .procname = "block_dump",
1563 .data = &block_dump,
1564 .maxlen = sizeof(block_dump),
1565 .mode = 0644,
6d456111 1566 .proc_handler = proc_dointvec,
eec4844f 1567 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1568 },
1569 {
1da177e4
LT		 1570 .procname = "vfs_cache_pressure",
1571 .data = &sysctl_vfs_cache_pressure,
1572 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1573 .mode = 0644,
6d456111 1574 .proc_handler = proc_dointvec,
eec4844f 1575 .extra1 = SYSCTL_ZERO,
1da177e4 1576 },
67f3977f
AG		 1577#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
1578 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
1da177e4 1579 {
1da177e4
LT		 1580 .procname = "legacy_va_layout",
1581 .data = &sysctl_legacy_va_layout,
1582 .maxlen = sizeof(sysctl_legacy_va_layout),
1583 .mode = 0644,
6d456111 1584 .proc_handler = proc_dointvec,
eec4844f 1585 .extra1 = SYSCTL_ZERO,
1da177e4
LT		 1586 },
1587#endif
1743660b
CL		 1588#ifdef CONFIG_NUMA
1589 {
1743660b 1590 .procname = "zone_reclaim_mode",
a5f5f91d
MG		 1591 .data = &node_reclaim_mode,
1592 .maxlen = sizeof(node_reclaim_mode),
1743660b 1593 .mode = 0644,
6d456111 1594 .proc_handler = proc_dointvec,
eec4844f 1595 .extra1 = SYSCTL_ZERO,
1743660b 1596 },
9614634f 1597 {
9614634f
CL		 1598 .procname = "min_unmapped_ratio",
1599 .data = &sysctl_min_unmapped_ratio,
1600 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1601 .mode = 0644,
6d456111 1602 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
eec4844f 1603 .extra1 = SYSCTL_ZERO,
9614634f
CL		 1604 .extra2 = &one_hundred,
1605 },
0ff38490 1606 {
0ff38490
CL		 1607 .procname = "min_slab_ratio",
1608 .data = &sysctl_min_slab_ratio,
1609 .maxlen = sizeof(sysctl_min_slab_ratio),
1610 .mode = 0644,
6d456111 1611 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
eec4844f 1612 .extra1 = SYSCTL_ZERO,
0ff38490
CL		 1613 .extra2 = &one_hundred,
1614 },
e6e5494c 1615#endif
77461ab3
CL		 1616#ifdef CONFIG_SMP
1617 {
77461ab3
CL		 1618 .procname = "stat_interval",
1619 .data = &sysctl_stat_interval,
1620 .maxlen = sizeof(sysctl_stat_interval),
1621 .mode = 0644,
6d456111 1622 .proc_handler = proc_dointvec_jiffies,
77461ab3 1623 },
52b6f46b
HD		 1624 {
1625 .procname = "stat_refresh",
1626 .data = NULL,
1627 .maxlen = 0,
1628 .mode = 0600,
1629 .proc_handler = vmstat_refresh,
1630 },
77461ab3 1631#endif
6e141546 1632#ifdef CONFIG_MMU
ed032189 1633 {
ed032189 1634 .procname = "mmap_min_addr",
788084ab
EP		 1635 .data = &dac_mmap_min_addr,
1636 .maxlen = sizeof(unsigned long),
ed032189 1637 .mode = 0644,
6d456111 1638 .proc_handler = mmap_min_addr_handler,
ed032189 1639 },
6e141546 1640#endif
f0c0b2b8
KH		 1641#ifdef CONFIG_NUMA
1642 {
f0c0b2b8
KH		 1643 .procname = "numa_zonelist_order",
1644 .data = &numa_zonelist_order,
1645 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1646 .mode = 0644,
6d456111 1647 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1648 },
1649#endif
2b8232ce 1650#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1651 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1652 {
e6e5494c 1653 .procname = "vdso_enabled",
3d7ee969
AL		 1654#ifdef CONFIG_X86_32
1655 .data = &vdso32_enabled,
1656 .maxlen = sizeof(vdso32_enabled),
1657#else
e6e5494c
IM		 1658 .data = &vdso_enabled,
1659 .maxlen = sizeof(vdso_enabled),
3d7ee969 1660#endif
e6e5494c 1661 .mode = 0644,
6d456111 1662 .proc_handler = proc_dointvec,
eec4844f 1663 .extra1 = SYSCTL_ZERO,
e6e5494c 1664 },
1da177e4 1665#endif
195cf453
BG		 1666#ifdef CONFIG_HIGHMEM
1667 {
195cf453
BG		 1668 .procname = "highmem_is_dirtyable",
1669 .data = &vm_highmem_is_dirtyable,
1670 .maxlen = sizeof(vm_highmem_is_dirtyable),
1671 .mode = 0644,
6d456111 1672 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1673 .extra1 = SYSCTL_ZERO,
1674 .extra2 = SYSCTL_ONE,
195cf453
BG		 1675 },
1676#endif
6a46079c
AK		 1677#ifdef CONFIG_MEMORY_FAILURE
1678 {
6a46079c
AK		 1679 .procname = "memory_failure_early_kill",
1680 .data = &sysctl_memory_failure_early_kill,
1681 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1682 .mode = 0644,
6d456111 1683 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1684 .extra1 = SYSCTL_ZERO,
1685 .extra2 = SYSCTL_ONE,
6a46079c
AK		 1686 },
1687 {
6a46079c
AK		 1688 .procname = "memory_failure_recovery",
1689 .data = &sysctl_memory_failure_recovery,
1690 .maxlen = sizeof(sysctl_memory_failure_recovery),
1691 .mode = 0644,
6d456111 1692 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1693 .extra1 = SYSCTL_ZERO,
1694 .extra2 = SYSCTL_ONE,
6a46079c
AK		 1695 },
1696#endif
c9b1d098
AS		 1697 {
1698 .procname = "user_reserve_kbytes",
1699 .data = &sysctl_user_reserve_kbytes,
1700 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1701 .mode = 0644,
1702 .proc_handler = proc_doulongvec_minmax,
1703 },
4eeab4f5
AS		 1704 {
1705 .procname = "admin_reserve_kbytes",
1706 .data = &sysctl_admin_reserve_kbytes,
1707 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1708 .mode = 0644,
1709 .proc_handler = proc_doulongvec_minmax,
1710 },
d07e2259
DC		 1711#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1712 {
1713 .procname = "mmap_rnd_bits",
1714 .data = &mmap_rnd_bits,
1715 .maxlen = sizeof(mmap_rnd_bits),
1716 .mode = 0600,
1717 .proc_handler = proc_dointvec_minmax,
1718 .extra1 = (void *)&mmap_rnd_bits_min,
1719 .extra2 = (void *)&mmap_rnd_bits_max,
1720 },
1721#endif
1722#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1723 {
1724 .procname = "mmap_rnd_compat_bits",
1725 .data = &mmap_rnd_compat_bits,
1726 .maxlen = sizeof(mmap_rnd_compat_bits),
1727 .mode = 0600,
1728 .proc_handler = proc_dointvec_minmax,
1729 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1730 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1731 },
cefdca0a
PX		 1732#endif
1733#ifdef CONFIG_USERFAULTFD
1734 {
1735 .procname = "unprivileged_userfaultfd",
1736 .data = &sysctl_unprivileged_userfaultfd,
1737 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
1738 .mode = 0644,
1739 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1740 .extra1 = SYSCTL_ZERO,
1741 .extra2 = SYSCTL_ONE,
cefdca0a 1742 },
d07e2259 1743#endif
6fce56ec 1744 { }
1da177e4
LT		 1745};
1746
d8217f07 1747static struct ctl_table fs_table[] = {
1da177e4 1748 {
1da177e4
LT		 1749 .procname = "inode-nr",
1750 .data = &inodes_stat,
3942c07c 1751 .maxlen = 2*sizeof(long),
1da177e4 1752 .mode = 0444,
cffbc8aa 1753 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1754 },
1755 {
1da177e4
LT		 1756 .procname = "inode-state",
1757 .data = &inodes_stat,
3942c07c 1758 .maxlen = 7*sizeof(long),
1da177e4 1759 .mode = 0444,
cffbc8aa 1760 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1761 },
1762 {
1da177e4
LT		 1763 .procname = "file-nr",
1764 .data = &files_stat,
518de9b3 1765 .maxlen = sizeof(files_stat),
1da177e4 1766 .mode = 0444,
6d456111 1767 .proc_handler = proc_nr_files,
1da177e4
LT		 1768 },
1769 {
1da177e4
LT		 1770 .procname = "file-max",
1771 .data = &files_stat.max_files,
518de9b3 1772 .maxlen = sizeof(files_stat.max_files),
1da177e4 1773 .mode = 0644,
518de9b3 1774 .proc_handler = proc_doulongvec_minmax,
9002b214 1775 .extra1 = &zero_ul,
32a5ad9c 1776 .extra2 = &long_max,
1da177e4 1777 },
9cfe015a 1778 {
9cfe015a
ED		 1779 .procname = "nr_open",
1780 .data = &sysctl_nr_open,
9b80a184 1781 .maxlen = sizeof(unsigned int),
9cfe015a 1782 .mode = 0644,
6d456111 1783 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1784 .extra1 = &sysctl_nr_open_min,
1785 .extra2 = &sysctl_nr_open_max,
9cfe015a 1786 },
1da177e4 1787 {
1da177e4
LT		 1788 .procname = "dentry-state",
1789 .data = &dentry_stat,
3942c07c 1790 .maxlen = 6*sizeof(long),
1da177e4 1791 .mode = 0444,
312d3ca8 1792 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1793 },
1794 {
1da177e4
LT		 1795 .procname = "overflowuid",
1796 .data = &fs_overflowuid,
1797 .maxlen = sizeof(int),
1798 .mode = 0644,
6d456111 1799 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1800 .extra1 = &minolduid,
1801 .extra2 = &maxolduid,
1802 },
1803 {
1da177e4
LT		 1804 .procname = "overflowgid",
1805 .data = &fs_overflowgid,
1806 .maxlen = sizeof(int),
1807 .mode = 0644,
6d456111 1808 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1809 .extra1 = &minolduid,
1810 .extra2 = &maxolduid,
1811 },
bfcd17a6 1812#ifdef CONFIG_FILE_LOCKING
1da177e4 1813 {
1da177e4
LT		 1814 .procname = "leases-enable",
1815 .data = &leases_enable,
1816 .maxlen = sizeof(int),
1817 .mode = 0644,
6d456111 1818 .proc_handler = proc_dointvec,
1da177e4 1819 },
bfcd17a6 1820#endif
1da177e4
LT		 1821#ifdef CONFIG_DNOTIFY
1822 {
1da177e4
LT		 1823 .procname = "dir-notify-enable",
1824 .data = &dir_notify_enable,
1825 .maxlen = sizeof(int),
1826 .mode = 0644,
6d456111 1827 .proc_handler = proc_dointvec,
1da177e4
LT		 1828 },
1829#endif
1830#ifdef CONFIG_MMU
bfcd17a6 1831#ifdef CONFIG_FILE_LOCKING
1da177e4 1832 {
1da177e4
LT		 1833 .procname = "lease-break-time",
1834 .data = &lease_break_time,
1835 .maxlen = sizeof(int),
1836 .mode = 0644,
6d456111 1837 .proc_handler = proc_dointvec,
1da177e4 1838 },
bfcd17a6 1839#endif
ebf3f09c 1840#ifdef CONFIG_AIO
1da177e4 1841 {
1da177e4
LT		 1842 .procname = "aio-nr",
1843 .data = &aio_nr,
1844 .maxlen = sizeof(aio_nr),
1845 .mode = 0444,
6d456111 1846 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1847 },
1848 {
1da177e4
LT		 1849 .procname = "aio-max-nr",
1850 .data = &aio_max_nr,
1851 .maxlen = sizeof(aio_max_nr),
1852 .mode = 0644,
6d456111 1853 .proc_handler = proc_doulongvec_minmax,
1da177e4 1854 },
ebf3f09c 1855#endif /* CONFIG_AIO */
2d9048e2 1856#ifdef CONFIG_INOTIFY_USER
0399cb08 1857 {
0399cb08
RL		 1858 .procname = "inotify",
1859 .mode = 0555,
1860 .child = inotify_table,
1861 },
1862#endif
7ef9964e
DL		 1863#ifdef CONFIG_EPOLL
1864 {
1865 .procname = "epoll",
1866 .mode = 0555,
1867 .child = epoll_table,
1868 },
1869#endif
1da177e4 1870#endif
800179c9
KC		 1871 {
1872 .procname = "protected_symlinks",
1873 .data = &sysctl_protected_symlinks,
1874 .maxlen = sizeof(int),
1875 .mode = 0600,
1876 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1877 .extra1 = SYSCTL_ZERO,
1878 .extra2 = SYSCTL_ONE,
800179c9
KC		 1879 },
1880 {
1881 .procname = "protected_hardlinks",
1882 .data = &sysctl_protected_hardlinks,
1883 .maxlen = sizeof(int),
1884 .mode = 0600,
1885 .proc_handler = proc_dointvec_minmax,
eec4844f
MC		 1886 .extra1 = SYSCTL_ZERO,
1887 .extra2 = SYSCTL_ONE,
800179c9 1888 },
30aba665
SM		 1889 {
1890 .procname = "protected_fifos",
1891 .data = &sysctl_protected_fifos,
1892 .maxlen = sizeof(int),
1893 .mode = 0600,
1894 .proc_handler = proc_dointvec_minmax,
eec4844f 1895 .extra1 = SYSCTL_ZERO,
30aba665
SM		 1896 .extra2 = &two,
1897 },
1898 {
1899 .procname = "protected_regular",
1900 .data = &sysctl_protected_regular,
1901 .maxlen = sizeof(int),
1902 .mode = 0600,
1903 .proc_handler = proc_dointvec_minmax,
eec4844f 1904 .extra1 = SYSCTL_ZERO,
30aba665
SM		 1905 .extra2 = &two,
1906 },
d6e71144 1907 {
d6e71144
AC		 1908 .procname = "suid_dumpable",
1909 .data = &suid_dumpable,
1910 .maxlen = sizeof(int),
1911 .mode = 0644,
54b50199 1912 .proc_handler = proc_dointvec_minmax_coredump,
eec4844f 1913 .extra1 = SYSCTL_ZERO,
8e654fba 1914 .extra2 = &two,
d6e71144 1915 },
2abc26fc
EB		 1916#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1917 {
2abc26fc
EB		 1918 .procname = "binfmt_misc",
1919 .mode = 0555,
f9bd6733 1920 .child = sysctl_mount_point,
2abc26fc
EB		 1921 },
1922#endif
b492e95b 1923 {
ff9da691
JA		 1924 .procname = "pipe-max-size",
1925 .data = &pipe_max_size,
98159d97 1926 .maxlen = sizeof(pipe_max_size),
b492e95b 1927 .mode = 0644,
319e0a21 1928 .proc_handler = proc_dopipe_max_size,
b492e95b 1929 },
759c0114
WT		 1930 {
1931 .procname = "pipe-user-pages-hard",
1932 .data = &pipe_user_pages_hard,
1933 .maxlen = sizeof(pipe_user_pages_hard),
1934 .mode = 0644,
1935 .proc_handler = proc_doulongvec_minmax,
1936 },
1937 {
1938 .procname = "pipe-user-pages-soft",
1939 .data = &pipe_user_pages_soft,
1940 .maxlen = sizeof(pipe_user_pages_soft),
1941 .mode = 0644,
1942 .proc_handler = proc_doulongvec_minmax,
1943 },
d2921684
EB		 1944 {
1945 .procname = "mount-max",
1946 .data = &sysctl_mount_max,
1947 .maxlen = sizeof(unsigned int),
1948 .mode = 0644,
1949 .proc_handler = proc_dointvec_minmax,
eec4844f 1950 .extra1 = SYSCTL_ONE,
d2921684 1951 },
6fce56ec 1952 { }
1da177e4
LT		 1953};
1954
d8217f07 1955static struct ctl_table debug_table[] = {
7ac57a89 1956#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1957 {
abd4f750
MAS		 1958 .procname = "exception-trace",
1959 .data = &show_unhandled_signals,
1960 .maxlen = sizeof(int),
1961 .mode = 0644,
1962 .proc_handler = proc_dointvec
1963 },
b2be84df
MH		 1964#endif
1965#if defined(CONFIG_OPTPROBES)
1966 {
1967 .procname = "kprobes-optimization",
1968 .data = &sysctl_kprobes_optimization,
1969 .maxlen = sizeof(int),
1970 .mode = 0644,
1971 .proc_handler = proc_kprobes_optimization_handler,
eec4844f
MC		 1972 .extra1 = SYSCTL_ZERO,
1973 .extra2 = SYSCTL_ONE,
b2be84df 1974 },
abd4f750 1975#endif
6fce56ec 1976 { }
1da177e4
LT		 1977};
1978
d8217f07 1979static struct ctl_table dev_table[] = {
6fce56ec 1980 { }
0eeca283 1981};
1da177e4 1982
de4e83bd 1983int __init sysctl_init(void)
d912b0cc 1984{
fd4b616b
SR		 1985 struct ctl_table_header *hdr;
1986
1987 hdr = register_sysctl_table(sysctl_base_table);
1988 kmemleak_not_leak(hdr);
d912b0cc
EB		 1989 return 0;
1990}
1991
b89a8171
EB		 1992#endif /* CONFIG_SYSCTL */
1993
1da177e4
LT		 1994/*
1995 * /proc/sys support
1996 */
1997
b89a8171 1998#ifdef CONFIG_PROC_SYSCTL
1da177e4 1999
f8808300
KC		 2000static int _proc_do_string(char *data, int maxlen, int write,
2001 char __user *buffer,
b1ba4ddd 2002 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2003{
2004 size_t len;
2005 char __user *p;
2006 char c;
8d060877
ON		 2007
2008 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2009 *lenp = 0;
2010 return 0;
2011 }
8d060877 2012
1da177e4 2013 if (write) {
f4aacea2
KC		 2014 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
2015 /* Only continue writes not past the end of buffer. */
2016 len = strlen(data);
2017 if (len > maxlen - 1)
2018 len = maxlen - 1;
2019
2020 if (*ppos > len)
2021 return 0;
2022 len = *ppos;
2023 } else {
2024 /* Start writing from beginning of buffer. */
2025 len = 0;
2026 }
2027
2ca9bb45 2028 *ppos += *lenp;
1da177e4 2029 p = buffer;
2ca9bb45 2030 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 2031 if (get_user(c, p++))
2032 return -EFAULT;
2033 if (c == 0 || c == '\n')
2034 break;
2ca9bb45 2035 data[len++] = c;
1da177e4 2036 }
f8808300 2037 data[len] = 0;
1da177e4 2038 } else {
f5dd3d6f
SV		 2039 len = strlen(data);
2040 if (len > maxlen)
2041 len = maxlen;
8d060877
ON		 2042
2043 if (*ppos > len) {
2044 *lenp = 0;
2045 return 0;
2046 }
2047
2048 data += *ppos;
2049 len -= *ppos;
2050
1da177e4
LT		 2051 if (len > *lenp)
2052 len = *lenp;
2053 if (len)
f8808300 2054 if (copy_to_user(buffer, data, len))
1da177e4
LT		 2055 return -EFAULT;
2056 if (len < *lenp) {
f8808300 2057 if (put_user('\n', buffer + len))
1da177e4
LT		 2058 return -EFAULT;
2059 len++;
2060 }
2061 *lenp = len;
2062 *ppos += len;
2063 }
2064 return 0;
2065}
2066
f4aacea2
KC		 2067static void warn_sysctl_write(struct ctl_table *table)
2068{
2069 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2070 "This will not be supported in the future. To silence this\n"
2071 "warning, set kernel.sysctl_writes_strict = -1\n",
2072 current->comm, table->procname);
2073}
2074
d383d484 2075/**
5f733e8a 2076 * proc_first_pos_non_zero_ignore - check if first position is allowed
d383d484
LR		 2077 * @ppos: file position
2078 * @table: the sysctl table
2079 *
2080 * Returns true if the first position is non-zero and the sysctl_writes_strict
2081 * mode indicates this is not allowed for numeric input types. String proc
5f733e8a 2082 * handlers can ignore the return value.
d383d484
LR		 2083 */
2084static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2085 struct ctl_table *table)
2086{
2087 if (!*ppos)
2088 return false;
2089
2090 switch (sysctl_writes_strict) {
2091 case SYSCTL_WRITES_STRICT:
2092 return true;
2093 case SYSCTL_WRITES_WARN:
2094 warn_sysctl_write(table);
2095 return false;
2096 default:
2097 return false;
2098 }
2099}
2100
f5dd3d6f
SV		 2101/**
2102 * proc_dostring - read a string sysctl
2103 * @table: the sysctl table
2104 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 2105 * @buffer: the user buffer
2106 * @lenp: the size of the user buffer
2107 * @ppos: file position
2108 *
2109 * Reads/writes a string from/to the user buffer. If the kernel
2110 * buffer provided is not large enough to hold the string, the
2111 * string is truncated. The copied string is %NULL-terminated.
2112 * If the string is being read by the user process, it is copied
2113 * and a newline '\n' is added. It is truncated if the buffer is
2114 * not large enough.
2115 *
2116 * Returns 0 on success.
2117 */
8d65af78 2118int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2120{
d383d484
LR		 2121 if (write)
2122 proc_first_pos_non_zero_ignore(ppos, table);
f4aacea2 2123
f8808300
KC		 2124 return _proc_do_string((char *)(table->data), table->maxlen, write,
2125 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 2126}
2127
00b7c339
AW		 2128static size_t proc_skip_spaces(char **buf)
2129{
2130 size_t ret;
2131 char *tmp = skip_spaces(*buf);
2132 ret = tmp - *buf;
2133 *buf = tmp;
2134 return ret;
2135}
2136
9f977fb7
OP		 2137static void proc_skip_char(char **buf, size_t *size, const char v)
2138{
2139 while (*size) {
2140 if (**buf != v)
2141 break;
2142 (*size)--;
2143 (*buf)++;
2144 }
2145}
2146
7f2923c4
CB		 2147/**
2148 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2149 * fail on overflow
2150 *
2151 * @cp: kernel buffer containing the string to parse
2152 * @endp: pointer to store the trailing characters
2153 * @base: the base to use
2154 * @res: where the parsed integer will be stored
2155 *
2156 * In case of success 0 is returned and @res will contain the parsed integer,
2157 * @endp will hold any trailing characters.
2158 * This function will fail the parse on overflow. If there wasn't an overflow
2159 * the function will defer the decision what characters count as invalid to the
2160 * caller.
2161 */
2162static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
2163 unsigned long *res)
2164{
2165 unsigned long long result;
2166 unsigned int rv;
2167
2168 cp = _parse_integer_fixup_radix(cp, &base);
2169 rv = _parse_integer(cp, base, &result);
2170 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
2171 return -ERANGE;
2172
2173 cp += rv;
2174
2175 if (endp)
2176 *endp = (char *)cp;
2177
2178 *res = (unsigned long)result;
2179 return 0;
2180}
2181
00b7c339
AW		 2182#define TMPBUFLEN 22
2183/**
0fc377bd 2184 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2185 *
0fc377bd
RD		 2186 * @buf: a kernel buffer
2187 * @size: size of the kernel buffer
2188 * @val: this is where the number will be stored
2189 * @neg: set to %TRUE if number is negative
2190 * @perm_tr: a vector which contains the allowed trailers
2191 * @perm_tr_len: size of the perm_tr vector
2192 * @tr: pointer to store the trailer character
00b7c339 2193 *
0fc377bd
RD		 2194 * In case of success %0 is returned and @buf and @size are updated with
2195 * the amount of bytes read. If @tr is non-NULL and a trailing
2196 * character exists (size is non-zero after returning from this
2197 * function), @tr is updated with the trailing character.
00b7c339
AW		 2198 */
2199static int proc_get_long(char **buf, size_t *size,
2200 unsigned long *val, bool *neg,
2201 const char *perm_tr, unsigned perm_tr_len, char *tr)
2202{
2203 int len;
2204 char *p, tmp[TMPBUFLEN];
2205
2206 if (!*size)
2207 return -EINVAL;
2208
2209 len = *size;
2210 if (len > TMPBUFLEN - 1)
2211 len = TMPBUFLEN - 1;
2212
2213 memcpy(tmp, *buf, len);
2214
2215 tmp[len] = 0;
2216 p = tmp;
2217 if (*p == '-' && *size > 1) {
2218 *neg = true;
2219 p++;
2220 } else
2221 *neg = false;
2222 if (!isdigit(*p))
2223 return -EINVAL;
2224
7f2923c4
CB		 2225 if (strtoul_lenient(p, &p, 0, val))
2226 return -EINVAL;
00b7c339
AW		 2227
2228 len = p - tmp;
2229
2230 /* We don't know if the next char is whitespace thus we may accept
2231 * invalid integers (e.g. 1234...a) or two integers instead of one
2232 * (e.g. 123...1). So lets not allow such large numbers. */
2233 if (len == TMPBUFLEN - 1)
2234 return -EINVAL;
2235
2236 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2237 return -EINVAL;
1da177e4 2238
00b7c339
AW		 2239 if (tr && (len < *size))
2240 *tr = *p;
2241
2242 *buf += len;
2243 *size -= len;
2244
2245 return 0;
2246}
2247
2248/**
0fc377bd 2249 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2250 *
0fc377bd
RD		 2251 * @buf: the user buffer
2252 * @size: the size of the user buffer
2253 * @val: the integer to be converted
2254 * @neg: sign of the number, %TRUE for negative
00b7c339 2255 *
0fc377bd
RD		 2256 * In case of success %0 is returned and @buf and @size are updated with
2257 * the amount of bytes written.
00b7c339
AW		 2258 */
2259static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2260 bool neg)
2261{
2262 int len;
2263 char tmp[TMPBUFLEN], *p = tmp;
2264
2265 sprintf(p, "%s%lu", neg ? "-" : "", val);
2266 len = strlen(tmp);
2267 if (len > *size)
2268 len = *size;
2269 if (copy_to_user(*buf, tmp, len))
2270 return -EFAULT;
2271 *size -= len;
2272 *buf += len;
2273 return 0;
2274}
2275#undef TMPBUFLEN
2276
2277static int proc_put_char(void __user **buf, size_t *size, char c)
2278{
2279 if (*size) {
2280 char __user **buffer = (char __user **)buf;
2281 if (put_user(c, *buffer))
2282 return -EFAULT;
2283 (*size)--, (*buffer)++;
2284 *buf = *buffer;
2285 }
2286 return 0;
2287}
1da177e4 2288
00b7c339 2289static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2290 int *valp,
2291 int write, void *data)
2292{
2293 if (write) {
230633d1
HS		 2294 if (*negp) {
2295 if (*lvalp > (unsigned long) INT_MAX + 1)
2296 return -EINVAL;
2297 *valp = -*lvalp;
2298 } else {
2299 if (*lvalp > (unsigned long) INT_MAX)
2300 return -EINVAL;
2301 *valp = *lvalp;
2302 }
1da177e4
LT		 2303 } else {
2304 int val = *valp;
2305 if (val < 0) {
00b7c339 2306 *negp = true;
9a5bc726 2307 *lvalp = -(unsigned long)val;
1da177e4 2308 } else {
00b7c339 2309 *negp = false;
1da177e4
LT		 2310 *lvalp = (unsigned long)val;
2311 }
2312 }
2313 return 0;
2314}
2315
4f2fec00
LR		 2316static int do_proc_douintvec_conv(unsigned long *lvalp,
2317 unsigned int *valp,
2318 int write, void *data)
e7d316a0
SAK		 2319{
2320 if (write) {
425fffd8
LZ		 2321 if (*lvalp > UINT_MAX)
2322 return -EINVAL;
e7d316a0
SAK		 2323 *valp = *lvalp;
2324 } else {
2325 unsigned int val = *valp;
2326 *lvalp = (unsigned long)val;
2327 }
2328 return 0;
2329}
2330
00b7c339
AW		 2331static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2332
d8217f07 2333static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2334 int write, void __user *buffer,
fcfbd547 2335 size_t *lenp, loff_t *ppos,
00b7c339 2336 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2337 int write, void *data),
2338 void *data)
2339{
00b7c339 2340 int *i, vleft, first = 1, err = 0;
00b7c339 2341 size_t left;
70f6cbb6 2342 char *kbuf = NULL, *p;
1da177e4 2343
00b7c339 2344 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2345 *lenp = 0;
2346 return 0;
2347 }
2348
fcfbd547 2349 i = (int *) tbl_data;
1da177e4
LT		 2350 vleft = table->maxlen / sizeof(*i);
2351 left = *lenp;
2352
2353 if (!conv)
2354 conv = do_proc_dointvec_conv;
2355
00b7c339 2356 if (write) {
d383d484
LR		 2357 if (proc_first_pos_non_zero_ignore(ppos, table))
2358 goto out;
f4aacea2 2359
00b7c339
AW		 2360 if (left > PAGE_SIZE - 1)
2361 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2362 p = kbuf = memdup_user_nul(buffer, left);
2363 if (IS_ERR(kbuf))
2364 return PTR_ERR(kbuf);
00b7c339
AW		 2365 }
2366
1da177e4 2367 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2368 unsigned long lval;
2369 bool neg;
1da177e4 2370
00b7c339 2371 if (write) {
70f6cbb6 2372 left -= proc_skip_spaces(&p);
1da177e4 2373
563b0467
O		 2374 if (!left)
2375 break;
70f6cbb6 2376 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2377 proc_wspace_sep,
2378 sizeof(proc_wspace_sep), NULL);
2379 if (err)
1da177e4 2380 break;
00b7c339
AW		 2381 if (conv(&neg, &lval, i, 1, data)) {
2382 err = -EINVAL;
1da177e4 2383 break;
00b7c339 2384 }
1da177e4 2385 } else {
00b7c339
AW		 2386 if (conv(&neg, &lval, i, 0, data)) {
2387 err = -EINVAL;
2388 break;
2389 }
1da177e4 2390 if (!first)
00b7c339
AW		 2391 err = proc_put_char(&buffer, &left, '\t');
2392 if (err)
2393 break;
2394 err = proc_put_long(&buffer, &left, lval, neg);
2395 if (err)
1da177e4 2396 break;
1da177e4
LT		 2397 }
2398 }
2399
00b7c339
AW		 2400 if (!write && !first && left && !err)
2401 err = proc_put_char(&buffer, &left, '\n');
563b0467 2402 if (write && !err && left)
70f6cbb6 2403 left -= proc_skip_spaces(&p);
1da177e4 2404 if (write) {
70f6cbb6 2405 kfree(kbuf);
00b7c339
AW		 2406 if (first)
2407 return err ? : -EINVAL;
1da177e4 2408 }
1da177e4 2409 *lenp -= left;
f4aacea2 2410out:
1da177e4 2411 *ppos += *lenp;
00b7c339 2412 return err;
1da177e4
LT		 2413}
2414
8d65af78 2415static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2416 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2417 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2418 int write, void *data),
2419 void *data)
2420{
8d65af78 2421 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2422 buffer, lenp, ppos, conv, data);
2423}
2424
4f2fec00
LR		 2425static int do_proc_douintvec_w(unsigned int *tbl_data,
2426 struct ctl_table *table,
2427 void __user *buffer,
2428 size_t *lenp, loff_t *ppos,
2429 int (*conv)(unsigned long *lvalp,
2430 unsigned int *valp,
2431 int write, void *data),
2432 void *data)
2433{
2434 unsigned long lval;
2435 int err = 0;
2436 size_t left;
2437 bool neg;
2438 char *kbuf = NULL, *p;
2439
2440 left = *lenp;
2441
2442 if (proc_first_pos_non_zero_ignore(ppos, table))
2443 goto bail_early;
2444
2445 if (left > PAGE_SIZE - 1)
2446 left = PAGE_SIZE - 1;
2447
2448 p = kbuf = memdup_user_nul(buffer, left);
2449 if (IS_ERR(kbuf))
2450 return -EINVAL;
2451
2452 left -= proc_skip_spaces(&p);
2453 if (!left) {
2454 err = -EINVAL;
2455 goto out_free;
2456 }
2457
2458 err = proc_get_long(&p, &left, &lval, &neg,
2459 proc_wspace_sep,
2460 sizeof(proc_wspace_sep), NULL);
2461 if (err || neg) {
2462 err = -EINVAL;
2463 goto out_free;
2464 }
2465
2466 if (conv(&lval, tbl_data, 1, data)) {
2467 err = -EINVAL;
2468 goto out_free;
2469 }
2470
2471 if (!err && left)
2472 left -= proc_skip_spaces(&p);
2473
2474out_free:
2475 kfree(kbuf);
2476 if (err)
2477 return -EINVAL;
2478
2479 return 0;
2480
2481 /* This is in keeping with old __do_proc_dointvec() */
2482bail_early:
2483 *ppos += *lenp;
2484 return err;
2485}
2486
2487static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2488 size_t *lenp, loff_t *ppos,
2489 int (*conv)(unsigned long *lvalp,
2490 unsigned int *valp,
2491 int write, void *data),
2492 void *data)
2493{
2494 unsigned long lval;
2495 int err = 0;
2496 size_t left;
2497
2498 left = *lenp;
2499
2500 if (conv(&lval, tbl_data, 0, data)) {
2501 err = -EINVAL;
2502 goto out;
2503 }
2504
2505 err = proc_put_long(&buffer, &left, lval, false);
2506 if (err || !left)
2507 goto out;
2508
2509 err = proc_put_char(&buffer, &left, '\n');
2510
2511out:
2512 *lenp -= left;
2513 *ppos += *lenp;
2514
2515 return err;
2516}
2517
2518static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2519 int write, void __user *buffer,
2520 size_t *lenp, loff_t *ppos,
2521 int (*conv)(unsigned long *lvalp,
2522 unsigned int *valp,
2523 int write, void *data),
2524 void *data)
2525{
2526 unsigned int *i, vleft;
2527
2528 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2529 *lenp = 0;
2530 return 0;
2531 }
2532
2533 i = (unsigned int *) tbl_data;
2534 vleft = table->maxlen / sizeof(*i);
2535
2536 /*
2537 * Arrays are not supported, keep this simple. *Do not* add
2538 * support for them.
2539 */
2540 if (vleft != 1) {
2541 *lenp = 0;
2542 return -EINVAL;
2543 }
2544
2545 if (!conv)
2546 conv = do_proc_douintvec_conv;
2547
2548 if (write)
2549 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2550 conv, data);
2551 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2552}
2553
2554static int do_proc_douintvec(struct ctl_table *table, int write,
2555 void __user *buffer, size_t *lenp, loff_t *ppos,
2556 int (*conv)(unsigned long *lvalp,
2557 unsigned int *valp,
2558 int write, void *data),
2559 void *data)
2560{
2561 return __do_proc_douintvec(table->data, table, write,
2562 buffer, lenp, ppos, conv, data);
2563}
2564
1da177e4
LT		 2565/**
2566 * proc_dointvec - read a vector of integers
2567 * @table: the sysctl table
2568 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2569 * @buffer: the user buffer
2570 * @lenp: the size of the user buffer
2571 * @ppos: file position
2572 *
2573 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2574 * values from/to the user buffer, treated as an ASCII string.
2575 *
2576 * Returns 0 on success.
2577 */
8d65af78 2578int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2579 void __user *buffer, size_t *lenp, loff_t *ppos)
2580{
e7d316a0
SAK		 2581 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2582}
2583
2584/**
2585 * proc_douintvec - read a vector of unsigned integers
2586 * @table: the sysctl table
2587 * @write: %TRUE if this is a write to the sysctl file
2588 * @buffer: the user buffer
2589 * @lenp: the size of the user buffer
2590 * @ppos: file position
2591 *
2592 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2593 * values from/to the user buffer, treated as an ASCII string.
2594 *
2595 * Returns 0 on success.
2596 */
2597int proc_douintvec(struct ctl_table *table, int write,
2598 void __user *buffer, size_t *lenp, loff_t *ppos)
2599{
4f2fec00
LR		 2600 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2601 do_proc_douintvec_conv, NULL);
1da177e4
LT		 2602}
2603
34f5a398 2604/*
25ddbb18
AK		 2605 * Taint values can only be increased
2606 * This means we can safely use a temporary.
34f5a398 2607 */
8d65af78 2608static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2609 void __user *buffer, size_t *lenp, loff_t *ppos)
2610{
25ddbb18
AK		 2611 struct ctl_table t;
2612 unsigned long tmptaint = get_taint();
2613 int err;
34f5a398 2614
91fcd412 2615 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2616 return -EPERM;
2617
25ddbb18
AK		 2618 t = *table;
2619 t.data = &tmptaint;
8d65af78 2620 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2621 if (err < 0)
2622 return err;
2623
2624 if (write) {
2625 /*
2626 * Poor man's atomic or. Not worth adding a primitive
2627 * to everyone's atomic.h for this
2628 */
2629 int i;
2630 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2631 if ((tmptaint >> i) & 1)
373d4d09 2632 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2633 }
2634 }
2635
2636 return err;
34f5a398
TT		 2637}
2638
bfdc0b49 2639#ifdef CONFIG_PRINTK
620f6e8e 2640static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2641 void __user *buffer, size_t *lenp, loff_t *ppos)
2642{
2643 if (write && !capable(CAP_SYS_ADMIN))
2644 return -EPERM;
2645
2646 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2647}
2648#endif
2649
24704f36
WL		 2650/**
2651 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2652 * @min: pointer to minimum allowable value
2653 * @max: pointer to maximum allowable value
2654 *
2655 * The do_proc_dointvec_minmax_conv_param structure provides the
2656 * minimum and maximum values for doing range checking for those sysctl
2657 * parameters that use the proc_dointvec_minmax() handler.
2658 */
1da177e4
LT		 2659struct do_proc_dointvec_minmax_conv_param {
2660 int *min;
2661 int *max;
2662};
2663
00b7c339
AW		 2664static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2665 int *valp,
1da177e4
LT		 2666 int write, void *data)
2667{
2bc4fc60 2668 int tmp, ret;
1da177e4 2669 struct do_proc_dointvec_minmax_conv_param *param = data;
2bc4fc60
ZW		 2670 /*
2671 * If writing, first do so via a temporary local int so we can
2672 * bounds-check it before touching *valp.
2673 */
2674 int *ip = write ? &tmp : valp;
2675
2676 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
2677 if (ret)
2678 return ret;
2679
1da177e4 2680 if (write) {
2bc4fc60
ZW		 2681 if ((param->min && *param->min > tmp) ||
2682 (param->max && *param->max < tmp))
1da177e4 2683 return -EINVAL;
2bc4fc60 2684 *valp = tmp;
1da177e4 2685 }
2bc4fc60 2686
1da177e4
LT		 2687 return 0;
2688}
2689
2690/**
2691 * proc_dointvec_minmax - read a vector of integers with min/max values
2692 * @table: the sysctl table
2693 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2694 * @buffer: the user buffer
2695 * @lenp: the size of the user buffer
2696 * @ppos: file position
2697 *
2698 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2699 * values from/to the user buffer, treated as an ASCII string.
2700 *
2701 * This routine will ensure the values are within the range specified by
2702 * table->extra1 (min) and table->extra2 (max).
2703 *
24704f36 2704 * Returns 0 on success or -EINVAL on write when the range check fails.
1da177e4 2705 */
8d65af78 2706int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2707 void __user *buffer, size_t *lenp, loff_t *ppos)
2708{
2709 struct do_proc_dointvec_minmax_conv_param param = {
2710 .min = (int *) table->extra1,
2711 .max = (int *) table->extra2,
2712 };
8d65af78 2713 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2714 do_proc_dointvec_minmax_conv, &param);
2715}
2716
24704f36
WL		 2717/**
2718 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2719 * @min: pointer to minimum allowable value
2720 * @max: pointer to maximum allowable value
2721 *
2722 * The do_proc_douintvec_minmax_conv_param structure provides the
2723 * minimum and maximum values for doing range checking for those sysctl
2724 * parameters that use the proc_douintvec_minmax() handler.
2725 */
61d9b56a
LR		 2726struct do_proc_douintvec_minmax_conv_param {
2727 unsigned int *min;
2728 unsigned int *max;
2729};
2730
2731static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2732 unsigned int *valp,
2733 int write, void *data)
2734{
2bc4fc60
ZW		 2735 int ret;
2736 unsigned int tmp;
61d9b56a 2737 struct do_proc_douintvec_minmax_conv_param *param = data;
2bc4fc60
ZW		 2738 /* write via temporary local uint for bounds-checking */
2739 unsigned int *up = write ? &tmp : valp;
61d9b56a 2740
2bc4fc60
ZW		 2741 ret = do_proc_douintvec_conv(lvalp, up, write, data);
2742 if (ret)
2743 return ret;
fb910c42 2744
2bc4fc60
ZW		 2745 if (write) {
2746 if ((param->min && *param->min > tmp) ||
2747 (param->max && *param->max < tmp))
61d9b56a
LR		 2748 return -ERANGE;
2749
2bc4fc60 2750 *valp = tmp;
61d9b56a
LR		 2751 }
2752
2753 return 0;
2754}
2755
2756/**
2757 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2758 * @table: the sysctl table
2759 * @write: %TRUE if this is a write to the sysctl file
2760 * @buffer: the user buffer
2761 * @lenp: the size of the user buffer
2762 * @ppos: file position
2763 *
2764 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2765 * values from/to the user buffer, treated as an ASCII string. Negative
2766 * strings are not allowed.
2767 *
2768 * This routine will ensure the values are within the range specified by
2769 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2770 * check for UINT_MAX to avoid having to support wrap around uses from
2771 * userspace.
2772 *
24704f36 2773 * Returns 0 on success or -ERANGE on write when the range check fails.
61d9b56a
LR		 2774 */
2775int proc_douintvec_minmax(struct ctl_table *table, int write,
2776 void __user *buffer, size_t *lenp, loff_t *ppos)
2777{
2778 struct do_proc_douintvec_minmax_conv_param param = {
2779 .min = (unsigned int *) table->extra1,
2780 .max = (unsigned int *) table->extra2,
2781 };
2782 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2783 do_proc_douintvec_minmax_conv, &param);
2784}
2785
7a8d1819
JL		 2786static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2787 unsigned int *valp,
2788 int write, void *data)
2789{
7a8d1819 2790 if (write) {
fb910c42 2791 unsigned int val;
7a8d1819 2792
fb910c42 2793 val = round_pipe_size(*lvalp);
7a8d1819
JL		 2794 if (val == 0)
2795 return -EINVAL;
2796
7a8d1819
JL		 2797 *valp = val;
2798 } else {
2799 unsigned int val = *valp;
2800 *lvalp = (unsigned long) val;
2801 }
2802
2803 return 0;
2804}
2805
319e0a21
EB		 2806static int proc_dopipe_max_size(struct ctl_table *table, int write,
2807 void __user *buffer, size_t *lenp, loff_t *ppos)
7a8d1819 2808{
7a8d1819 2809 return do_proc_douintvec(table, write, buffer, lenp, ppos,
4c2e4bef 2810 do_proc_dopipe_max_size_conv, NULL);
7a8d1819
JL		 2811}
2812
54b50199
KC		 2813static void validate_coredump_safety(void)
2814{
046d662f 2815#ifdef CONFIG_COREDUMP
e579d2c2 2816 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199 2817 core_pattern[0] != '/' && core_pattern[0] != '|') {
760c6a91
AD		 2818 printk(KERN_WARNING
2819"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2820"Pipe handler or fully qualified core dump path required.\n"
2821"Set kernel.core_pattern before fs.suid_dumpable.\n"
2822 );
54b50199 2823 }
046d662f 2824#endif
54b50199
KC		 2825}
2826
2827static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2828 void __user *buffer, size_t *lenp, loff_t *ppos)
2829{
2830 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2831 if (!error)
2832 validate_coredump_safety();
2833 return error;
2834}
2835
046d662f 2836#ifdef CONFIG_COREDUMP
54b50199
KC		 2837static int proc_dostring_coredump(struct ctl_table *table, int write,
2838 void __user *buffer, size_t *lenp, loff_t *ppos)
2839{
2840 int error = proc_dostring(table, write, buffer, lenp, ppos);
2841 if (!error)
2842 validate_coredump_safety();
2843 return error;
2844}
046d662f 2845#endif
54b50199 2846
d8217f07 2847static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2848 void __user *buffer,
2849 size_t *lenp, loff_t *ppos,
2850 unsigned long convmul,
2851 unsigned long convdiv)
2852{
00b7c339
AW		 2853 unsigned long *i, *min, *max;
2854 int vleft, first = 1, err = 0;
00b7c339 2855 size_t left;
70f6cbb6 2856 char *kbuf = NULL, *p;
00b7c339
AW		 2857
2858 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2859 *lenp = 0;
2860 return 0;
2861 }
00b7c339 2862
fcfbd547 2863 i = (unsigned long *) data;
1da177e4
LT		 2864 min = (unsigned long *) table->extra1;
2865 max = (unsigned long *) table->extra2;
2866 vleft = table->maxlen / sizeof(unsigned long);
2867 left = *lenp;
00b7c339
AW		 2868
2869 if (write) {
d383d484
LR		 2870 if (proc_first_pos_non_zero_ignore(ppos, table))
2871 goto out;
f4aacea2 2872
00b7c339
AW		 2873 if (left > PAGE_SIZE - 1)
2874 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2875 p = kbuf = memdup_user_nul(buffer, left);
2876 if (IS_ERR(kbuf))
2877 return PTR_ERR(kbuf);
00b7c339
AW		 2878 }
2879
27b3d80a 2880 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2881 unsigned long val;
2882
1da177e4 2883 if (write) {
00b7c339
AW		 2884 bool neg;
2885
70f6cbb6 2886 left -= proc_skip_spaces(&p);
09be1784
CL		 2887 if (!left)
2888 break;
00b7c339 2889
70f6cbb6 2890 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2891 proc_wspace_sep,
2892 sizeof(proc_wspace_sep), NULL);
2893 if (err)
1da177e4
LT		 2894 break;
2895 if (neg)
1da177e4 2896 continue;
ff9f8a7c 2897 val = convmul * val / convdiv;
e260ad01
CB		 2898 if ((min && val < *min) || (max && val > *max)) {
2899 err = -EINVAL;
2900 break;
2901 }
1da177e4
LT		 2902 *i = val;
2903 } else {
00b7c339 2904 val = convdiv * (*i) / convmul;
7833819d 2905 if (!first) {
00b7c339 2906 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2907 if (err)
2908 break;
2909 }
00b7c339
AW		 2910 err = proc_put_long(&buffer, &left, val, false);
2911 if (err)
2912 break;
1da177e4
LT		 2913 }
2914 }
2915
00b7c339
AW		 2916 if (!write && !first && left && !err)
2917 err = proc_put_char(&buffer, &left, '\n');
2918 if (write && !err)
70f6cbb6 2919 left -= proc_skip_spaces(&p);
1da177e4 2920 if (write) {
70f6cbb6 2921 kfree(kbuf);
00b7c339
AW		 2922 if (first)
2923 return err ? : -EINVAL;
1da177e4 2924 }
1da177e4 2925 *lenp -= left;
f4aacea2 2926out:
1da177e4 2927 *ppos += *lenp;
00b7c339 2928 return err;
1da177e4
LT		 2929}
2930
d8217f07 2931static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2932 void __user *buffer,
2933 size_t *lenp, loff_t *ppos,
2934 unsigned long convmul,
2935 unsigned long convdiv)
2936{
2937 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2938 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2939}
2940
1da177e4
LT		 2941/**
2942 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2943 * @table: the sysctl table
2944 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2945 * @buffer: the user buffer
2946 * @lenp: the size of the user buffer
2947 * @ppos: file position
2948 *
2949 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2950 * values from/to the user buffer, treated as an ASCII string.
2951 *
2952 * This routine will ensure the values are within the range specified by
2953 * table->extra1 (min) and table->extra2 (max).
2954 *
2955 * Returns 0 on success.
2956 */
8d65af78 2957int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2958 void __user *buffer, size_t *lenp, loff_t *ppos)
2959{
8d65af78 2960 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2961}
2962
2963/**
2964 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2965 * @table: the sysctl table
2966 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2967 * @buffer: the user buffer
2968 * @lenp: the size of the user buffer
2969 * @ppos: file position
2970 *
2971 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2972 * values from/to the user buffer, treated as an ASCII string. The values
2973 * are treated as milliseconds, and converted to jiffies when they are stored.
2974 *
2975 * This routine will ensure the values are within the range specified by
2976 * table->extra1 (min) and table->extra2 (max).
2977 *
2978 * Returns 0 on success.
2979 */
d8217f07 2980int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2981 void __user *buffer,
2982 size_t *lenp, loff_t *ppos)
2983{
8d65af78 2984 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2985 lenp, ppos, HZ, 1000l);
2986}
2987
2988
00b7c339 2989static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2990 int *valp,
2991 int write, void *data)
2992{
2993 if (write) {
63259457 2994 if (*lvalp > INT_MAX / HZ)
cba9f33d 2995 return 1;
1da177e4
LT		 2996 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2997 } else {
2998 int val = *valp;
2999 unsigned long lval;
3000 if (val < 0) {
00b7c339 3001 *negp = true;
9a5bc726 3002 lval = -(unsigned long)val;
1da177e4 3003 } else {
00b7c339 3004 *negp = false;
1da177e4
LT		 3005 lval = (unsigned long)val;
3006 }
3007 *lvalp = lval / HZ;
3008 }
3009 return 0;
3010}
3011
00b7c339 3012static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 3013 int *valp,
3014 int write, void *data)
3015{
3016 if (write) {
cba9f33d
BS		 3017 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
3018 return 1;
1da177e4
LT		 3019 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
3020 } else {
3021 int val = *valp;
3022 unsigned long lval;
3023 if (val < 0) {
00b7c339 3024 *negp = true;
9a5bc726 3025 lval = -(unsigned long)val;
1da177e4 3026 } else {
00b7c339 3027 *negp = false;
1da177e4
LT		 3028 lval = (unsigned long)val;
3029 }
3030 *lvalp = jiffies_to_clock_t(lval);
3031 }
3032 return 0;
3033}
3034
00b7c339 3035static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 3036 int *valp,
3037 int write, void *data)
3038{
3039 if (write) {
d738ce8f
FF		 3040 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
3041
3042 if (jif > INT_MAX)
3043 return 1;
3044 *valp = (int)jif;
1da177e4
LT		 3045 } else {
3046 int val = *valp;
3047 unsigned long lval;
3048 if (val < 0) {
00b7c339 3049 *negp = true;
9a5bc726 3050 lval = -(unsigned long)val;
1da177e4 3051 } else {
00b7c339 3052 *negp = false;
1da177e4
LT		 3053 lval = (unsigned long)val;
3054 }
3055 *lvalp = jiffies_to_msecs(lval);
3056 }
3057 return 0;
3058}
3059
3060/**
3061 * proc_dointvec_jiffies - read a vector of integers as seconds
3062 * @table: the sysctl table
3063 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 3064 * @buffer: the user buffer
3065 * @lenp: the size of the user buffer
3066 * @ppos: file position
3067 *
3068 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3069 * values from/to the user buffer, treated as an ASCII string.
3070 * The values read are assumed to be in seconds, and are converted into
3071 * jiffies.
3072 *
3073 * Returns 0 on success.
3074 */
8d65af78 3075int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3076 void __user *buffer, size_t *lenp, loff_t *ppos)
3077{
8d65af78 3078 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 3079 do_proc_dointvec_jiffies_conv,NULL);
3080}
3081
3082/**
3083 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3084 * @table: the sysctl table
3085 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 3086 * @buffer: the user buffer
3087 * @lenp: the size of the user buffer
1e5d5331 3088 * @ppos: pointer to the file position
1da177e4
LT		 3089 *
3090 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3091 * values from/to the user buffer, treated as an ASCII string.
3092 * The values read are assumed to be in 1/USER_HZ seconds, and
3093 * are converted into jiffies.
3094 *
3095 * Returns 0 on success.
3096 */
8d65af78 3097int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3098 void __user *buffer, size_t *lenp, loff_t *ppos)
3099{
8d65af78 3100 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 3101 do_proc_dointvec_userhz_jiffies_conv,NULL);
3102}
3103
3104/**
3105 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3106 * @table: the sysctl table
3107 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 3108 * @buffer: the user buffer
3109 * @lenp: the size of the user buffer
67be2dd1
MW		 3110 * @ppos: file position
3111 * @ppos: the current position in the file
1da177e4
LT		 3112 *
3113 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3114 * values from/to the user buffer, treated as an ASCII string.
3115 * The values read are assumed to be in 1/1000 seconds, and
3116 * are converted into jiffies.
3117 *
3118 * Returns 0 on success.
3119 */
8d65af78 3120int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3121 void __user *buffer, size_t *lenp, loff_t *ppos)
3122{
8d65af78 3123 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 3124 do_proc_dointvec_ms_jiffies_conv, NULL);
3125}
3126
8d65af78 3127static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 3128 void __user *buffer, size_t *lenp, loff_t *ppos)
3129{
3130 struct pid *new_pid;
3131 pid_t tmp;
3132 int r;
3133
6c5f3e7b 3134 tmp = pid_vnr(cad_pid);
9ec52099 3135
8d65af78 3136 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 3137 lenp, ppos, NULL, NULL);
3138 if (r || !write)
3139 return r;
3140
3141 new_pid = find_get_pid(tmp);
3142 if (!new_pid)
3143 return -ESRCH;
3144
3145 put_pid(xchg(&cad_pid, new_pid));
3146 return 0;
3147}
3148
9f977fb7
OP		 3149/**
3150 * proc_do_large_bitmap - read/write from/to a large bitmap
3151 * @table: the sysctl table
3152 * @write: %TRUE if this is a write to the sysctl file
3153 * @buffer: the user buffer
3154 * @lenp: the size of the user buffer
3155 * @ppos: file position
3156 *
3157 * The bitmap is stored at table->data and the bitmap length (in bits)
3158 * in table->maxlen.
3159 *
3160 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3161 * large bitmaps may be represented in a compact manner. Writing into
3162 * the file will clear the bitmap then update it with the given input.
3163 *
3164 * Returns 0 on success.
3165 */
3166int proc_do_large_bitmap(struct ctl_table *table, int write,
3167 void __user *buffer, size_t *lenp, loff_t *ppos)
3168{
3169 int err = 0;
3170 bool first = 1;
3171 size_t left = *lenp;
3172 unsigned long bitmap_len = table->maxlen;
122ff243 3173 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 3174 unsigned long *tmp_bitmap = NULL;
3175 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3176
122ff243 3177 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 3178 *lenp = 0;
3179 return 0;
3180 }
3181
3182 if (write) {
70f6cbb6 3183 char *kbuf, *p;
3116ad38 3184 size_t skipped = 0;
9f977fb7 3185
3116ad38 3186 if (left > PAGE_SIZE - 1) {
9f977fb7 3187 left = PAGE_SIZE - 1;
3116ad38
ES		 3188 /* How much of the buffer we'll skip this pass */
3189 skipped = *lenp - left;
3190 }
9f977fb7 3191
70f6cbb6
AV		 3192 p = kbuf = memdup_user_nul(buffer, left);
3193 if (IS_ERR(kbuf))
3194 return PTR_ERR(kbuf);
9f977fb7 3195
475dae38 3196 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
9f977fb7 3197 if (!tmp_bitmap) {
70f6cbb6 3198 kfree(kbuf);
9f977fb7
OP		 3199 return -ENOMEM;
3200 }
70f6cbb6 3201 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 3202 while (!err && left) {
3203 unsigned long val_a, val_b;
3204 bool neg;
3116ad38 3205 size_t saved_left;
9f977fb7 3206
3116ad38
ES		 3207 /* In case we stop parsing mid-number, we can reset */
3208 saved_left = left;
70f6cbb6 3209 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7 3210 sizeof(tr_a), &c);
3116ad38
ES		 3211 /*
3212 * If we consumed the entirety of a truncated buffer or
3213 * only one char is left (may be a "-"), then stop here,
3214 * reset, & come back for more.
3215 */
3216 if ((left <= 1) && skipped) {
3217 left = saved_left;
3218 break;
3219 }
3220
9f977fb7
OP		 3221 if (err)
3222 break;
3223 if (val_a >= bitmap_len || neg) {
3224 err = -EINVAL;
3225 break;
3226 }
3227
3228 val_b = val_a;
3229 if (left) {
70f6cbb6 3230 p++;
9f977fb7
OP		 3231 left--;
3232 }
3233
3234 if (c == '-') {
70f6cbb6 3235 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 3236 &neg, tr_b, sizeof(tr_b),
3237 &c);
3116ad38
ES		 3238 /*
3239 * If we consumed all of a truncated buffer or
3240 * then stop here, reset, & come back for more.
3241 */
3242 if (!left && skipped) {
3243 left = saved_left;
3244 break;
3245 }
3246
9f977fb7
OP		 3247 if (err)
3248 break;
3249 if (val_b >= bitmap_len || neg ||
3250 val_a > val_b) {
3251 err = -EINVAL;
3252 break;
3253 }
3254 if (left) {
70f6cbb6 3255 p++;
9f977fb7
OP		 3256 left--;
3257 }
3258 }
3259
5a04cca6 3260 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 3261 first = 0;
70f6cbb6 3262 proc_skip_char(&p, &left, '\n');
9f977fb7 3263 }
70f6cbb6 3264 kfree(kbuf);
3116ad38 3265 left += skipped;
9f977fb7
OP		 3266 } else {
3267 unsigned long bit_a, bit_b = 0;
3268
3269 while (left) {
3270 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3271 if (bit_a >= bitmap_len)
3272 break;
3273 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3274 bit_a + 1) - 1;
3275
3276 if (!first) {
3277 err = proc_put_char(&buffer, &left, ',');
3278 if (err)
3279 break;
3280 }
3281 err = proc_put_long(&buffer, &left, bit_a, false);
3282 if (err)
3283 break;
3284 if (bit_a != bit_b) {
3285 err = proc_put_char(&buffer, &left, '-');
3286 if (err)
3287 break;
3288 err = proc_put_long(&buffer, &left, bit_b, false);
3289 if (err)
3290 break;
3291 }
3292
3293 first = 0; bit_b++;
3294 }
3295 if (!err)
3296 err = proc_put_char(&buffer, &left, '\n');
3297 }
3298
3299 if (!err) {
3300 if (write) {
3301 if (*ppos)
3302 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3303 else
5a04cca6 3304 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7 3305 }
9f977fb7
OP		 3306 *lenp -= left;
3307 *ppos += *lenp;
9f977fb7 3308 }
f9eb2fdd 3309
475dae38 3310 bitmap_free(tmp_bitmap);
f9eb2fdd 3311 return err;
9f977fb7
OP		 3312}
3313
55610500 3314#else /* CONFIG_PROC_SYSCTL */
1da177e4 3315
8d65af78 3316int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 3317 void __user *buffer, size_t *lenp, loff_t *ppos)
3318{
3319 return -ENOSYS;
3320}
3321
8d65af78 3322int proc_dointvec(struct ctl_table *table, int write,
1da177e4 3323 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 3324{
3325 return -ENOSYS;
3326}
3327
e7d316a0
SAK		 3328int proc_douintvec(struct ctl_table *table, int write,
3329 void __user *buffer, size_t *lenp, loff_t *ppos)
3330{
3331 return -ENOSYS;
3332}
3333
8d65af78 3334int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3335 void __user *buffer, size_t *lenp, loff_t *ppos)
3336{
3337 return -ENOSYS;
3338}
3339
61d9b56a
LR		 3340int proc_douintvec_minmax(struct ctl_table *table, int write,
3341 void __user *buffer, size_t *lenp, loff_t *ppos)
3342{
3343 return -ENOSYS;
3344}
3345
8d65af78 3346int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3347 void __user *buffer, size_t *lenp, loff_t *ppos)
3348{
3349 return -ENOSYS;
3350}
3351
8d65af78 3352int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3353 void __user *buffer, size_t *lenp, loff_t *ppos)
3354{
3355 return -ENOSYS;
3356}
3357
8d65af78 3358int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3359 void __user *buffer, size_t *lenp, loff_t *ppos)
3360{
3361 return -ENOSYS;
3362}
3363
8d65af78 3364int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3365 void __user *buffer, size_t *lenp, loff_t *ppos)
3366{
3367 return -ENOSYS;
3368}
3369
d8217f07 3370int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3371 void __user *buffer,
3372 size_t *lenp, loff_t *ppos)
3373{
3374 return -ENOSYS;
3375}
3376
0bc19985
SS		 3377int proc_do_large_bitmap(struct ctl_table *table, int write,
3378 void __user *buffer, size_t *lenp, loff_t *ppos)
3379{
3380 return -ENOSYS;
3381}
1da177e4 3382
55610500 3383#endif /* CONFIG_PROC_SYSCTL */
1da177e4 3384
a8e11e5c
ED		 3385#if defined(CONFIG_SYSCTL)
3386int proc_do_static_key(struct ctl_table *table, int write,
3387 void __user *buffer, size_t *lenp,
3388 loff_t *ppos)
492ecee8 3389{
a8e11e5c
ED		 3390 struct static_key *key = (struct static_key *)table->data;
3391 static DEFINE_MUTEX(static_key_mutex);
3392 int val, ret;
3393 struct ctl_table tmp = {
3394 .data = &val,
3395 .maxlen = sizeof(val),
3396 .mode = table->mode,
eec4844f
MC		 3397 .extra1 = SYSCTL_ZERO,
3398 .extra2 = SYSCTL_ONE,
a8e11e5c 3399 };
492ecee8
AS		 3400
3401 if (write && !capable(CAP_SYS_ADMIN))
3402 return -EPERM;
3403
a8e11e5c
ED		 3404 mutex_lock(&static_key_mutex);
3405 val = static_key_enabled(key);
492ecee8
AS		 3406 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3407 if (write && !ret) {
a8e11e5c
ED		 3408 if (val)
3409 static_key_enable(key);
492ecee8 3410 else
a8e11e5c 3411 static_key_disable(key);
492ecee8 3412 }
a8e11e5c 3413 mutex_unlock(&static_key_mutex);
492ecee8
AS		 3414 return ret;
3415}
3fcc5530 3416#endif
1da177e4
LT		 3417/*
3418 * No sense putting this after each symbol definition, twice,
3419 * exception granted :-)
3420 */
3421EXPORT_SYMBOL(proc_dointvec);
e7d316a0 3422EXPORT_SYMBOL(proc_douintvec);
1da177e4
LT		 3423EXPORT_SYMBOL(proc_dointvec_jiffies);
3424EXPORT_SYMBOL(proc_dointvec_minmax);
61d9b56a 3425EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
1da177e4
LT		 3426EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3427EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3428EXPORT_SYMBOL(proc_dostring);
3429EXPORT_SYMBOL(proc_doulongvec_minmax);
3430EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
0bc19985 3431EXPORT_SYMBOL(proc_do_large_bitmap);
Linux 6.x block layer and io_uring tree(s)