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cciss: switch to memdup_user_nul()
[linux-2.6-block.git] / kernel / sysctl.c
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1da177e4
LT		 1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
1da177e4 21#include <linux/module.h>
e2e40f2c 22#include <linux/aio.h>
1da177e4
LT		 23#include <linux/mm.h>
24#include <linux/swap.h>
25#include <linux/slab.h>
26#include <linux/sysctl.h>
5a04cca6 27#include <linux/bitmap.h>
d33ed52d 28#include <linux/signal.h>
455cd5ab 29#include <linux/printk.h>
1da177e4 30#include <linux/proc_fs.h>
72c2d582 31#include <linux/security.h>
1da177e4 32#include <linux/ctype.h>
dfec072e 33#include <linux/kmemcheck.h>
fd4b616b 34#include <linux/kmemleak.h>
62239ac2 35#include <linux/fs.h>
1da177e4
LT		 36#include <linux/init.h>
37#include <linux/kernel.h>
0296b228 38#include <linux/kobject.h>
20380731 39#include <linux/net.h>
1da177e4
LT		 40#include <linux/sysrq.h>
41#include <linux/highuid.h>
42#include <linux/writeback.h>
3fff4c42 43#include <linux/ratelimit.h>
76ab0f53 44#include <linux/compaction.h>
1da177e4 45#include <linux/hugetlb.h>
1da177e4 46#include <linux/initrd.h>
0b77f5bf 47#include <linux/key.h>
1da177e4
LT		 48#include <linux/times.h>
49#include <linux/limits.h>
50#include <linux/dcache.h>
6e006701 51#include <linux/dnotify.h>
1da177e4 52#include <linux/syscalls.h>
c748e134 53#include <linux/vmstat.h>
c255d844
PM		 54#include <linux/nfs_fs.h>
55#include <linux/acpi.h>
10a0a8d4 56#include <linux/reboot.h>
b0fc494f 57#include <linux/ftrace.h>
cdd6c482 58#include <linux/perf_event.h>
b2be84df 59#include <linux/kprobes.h>
b492e95b 60#include <linux/pipe_fs_i.h>
8e4228e1 61#include <linux/oom.h>
17f60a7d 62#include <linux/kmod.h>
73efc039 63#include <linux/capability.h>
40401530 64#include <linux/binfmts.h>
cf4aebc2 65#include <linux/sched/sysctl.h>
7984754b 66#include <linux/kexec.h>
1be7f75d 67#include <linux/bpf.h>
1da177e4
LT		 68
69#include <asm/uaccess.h>
70#include <asm/processor.h>
71
29cbc78b
AK		 72#ifdef CONFIG_X86
73#include <asm/nmi.h>
0741f4d2 74#include <asm/stacktrace.h>
6e7c4025 75#include <asm/io.h>
29cbc78b 76#endif
d550bbd4
DH		 77#ifdef CONFIG_SPARC
78#include <asm/setup.h>
79#endif
c55b7c3e
DY		 80#ifdef CONFIG_BSD_PROCESS_ACCT
81#include <linux/acct.h>
82#endif
4f0e056f
DY		 83#ifdef CONFIG_RT_MUTEXES
84#include <linux/rtmutex.h>
85#endif
2edf5e49
DY		 86#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
87#include <linux/lockdep.h>
88#endif
15485a46
DY		 89#ifdef CONFIG_CHR_DEV_SG
90#include <scsi/sg.h>
91#endif
29cbc78b 92
58687acb 93#ifdef CONFIG_LOCKUP_DETECTOR
504d7cf1
DZ		 94#include <linux/nmi.h>
95#endif
96
1da177e4
LT		 97#if defined(CONFIG_SYSCTL)
98
99/* External variables not in a header file. */
d6e71144 100extern int suid_dumpable;
046d662f
AK		 101#ifdef CONFIG_COREDUMP
102extern int core_uses_pid;
1da177e4 103extern char core_pattern[];
a293980c 104extern unsigned int core_pipe_limit;
046d662f 105#endif
1da177e4 106extern int pid_max;
1da177e4 107extern int pid_max_min, pid_max_max;
8ad4b1fb 108extern int percpu_pagelist_fraction;
bebfa101 109extern int compat_log;
9745512c 110extern int latencytop_enabled;
eceea0b3 111extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 112#ifndef CONFIG_MMU
113extern int sysctl_nr_trim_pages;
114#endif
1da177e4 115
c4f3b63f 116/* Constants used for minimum and maximum */
2508ce18 117#ifdef CONFIG_LOCKUP_DETECTOR
c4f3b63f
RT		 118static int sixty = 60;
119#endif
120
270750db
AT		 121static int __maybe_unused neg_one = -1;
122
c4f3b63f 123static int zero;
cd5f9a4c
LT		 124static int __maybe_unused one = 1;
125static int __maybe_unused two = 2;
5509a5d2 126static int __maybe_unused four = 4;
fc3501d4 127static unsigned long one_ul = 1;
c4f3b63f 128static int one_hundred = 100;
af91322e
DY		 129#ifdef CONFIG_PRINTK
130static int ten_thousand = 10000;
131#endif
c4f3b63f 132
9e4a5bda
AR		 133/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135
1da177e4
LT		 136/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137static int maxolduid = 65535;
138static int minolduid;
139
140static int ngroups_max = NGROUPS_MAX;
73efc039 141static const int cap_last_cap = CAP_LAST_CAP;
1da177e4 142
80df2847
LH		 143/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
144#ifdef CONFIG_DETECT_HUNG_TASK
145static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
146#endif
147
d14f1729
DY		 148#ifdef CONFIG_INOTIFY_USER
149#include <linux/inotify.h>
150#endif
72c57ed5 151#ifdef CONFIG_SPARC
1da177e4
LT		 152#endif
153
154#ifdef __hppa__
155extern int pwrsw_enabled;
bf14e3b9
VG		 156#endif
157
158#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4
LT		 159extern int unaligned_enabled;
160#endif
1da177e4 161
d2b176ed 162#ifdef CONFIG_IA64
88fc241f 163extern int unaligned_dump_stack;
d2b176ed
JS		 164#endif
165
b6fca725
VG		 166#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167extern int no_unaligned_warning;
168#endif
169
d6f8ff73 170#ifdef CONFIG_PROC_SYSCTL
f4aacea2
KC		 171
172#define SYSCTL_WRITES_LEGACY -1
173#define SYSCTL_WRITES_WARN 0
174#define SYSCTL_WRITES_STRICT 1
175
176static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
177
8d65af78 178static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 179 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 180static int proc_taint(struct ctl_table *table, int write,
34f5a398 181 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 182#endif
9ec52099 183
bfdc0b49 184#ifdef CONFIG_PRINTK
620f6e8e 185static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 186 void __user *buffer, size_t *lenp, loff_t *ppos);
187#endif
188
54b50199
KC		 189static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 191#ifdef CONFIG_COREDUMP
54b50199
KC		 192static int proc_dostring_coredump(struct ctl_table *table, int write,
193 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 194#endif
54b50199 195
97f5f0cd 196#ifdef CONFIG_MAGIC_SYSRQ
8c6a98b2 197/* Note: sysrq code uses it's own private copy */
8eaede49 198static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
97f5f0cd 199
6f8fd1d7 200static int sysrq_sysctl_handler(struct ctl_table *table, int write,
97f5f0cd
DT		 201 void __user *buffer, size_t *lenp,
202 loff_t *ppos)
203{
204 int error;
205
206 error = proc_dointvec(table, write, buffer, lenp, ppos);
207 if (error)
208 return error;
209
210 if (write)
211 sysrq_toggle_support(__sysrq_enabled);
212
213 return 0;
214}
215
216#endif
217
d8217f07
EB		 218static struct ctl_table kern_table[];
219static struct ctl_table vm_table[];
220static struct ctl_table fs_table[];
221static struct ctl_table debug_table[];
222static struct ctl_table dev_table[];
223extern struct ctl_table random_table[];
7ef9964e
DL		 224#ifdef CONFIG_EPOLL
225extern struct ctl_table epoll_table[];
226#endif
1da177e4
LT		 227
228#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
229int sysctl_legacy_va_layout;
230#endif
231
1da177e4
LT		 232/* The default sysctl tables: */
233
de4e83bd 234static struct ctl_table sysctl_base_table[] = {
1da177e4 235 {
1da177e4
LT		 236 .procname = "kernel",
237 .mode = 0555,
238 .child = kern_table,
239 },
240 {
1da177e4
LT		 241 .procname = "vm",
242 .mode = 0555,
243 .child = vm_table,
244 },
1da177e4 245 {
1da177e4
LT		 246 .procname = "fs",
247 .mode = 0555,
248 .child = fs_table,
249 },
250 {
1da177e4
LT		 251 .procname = "debug",
252 .mode = 0555,
253 .child = debug_table,
254 },
255 {
1da177e4
LT		 256 .procname = "dev",
257 .mode = 0555,
258 .child = dev_table,
259 },
6fce56ec 260 { }
1da177e4
LT		 261};
262
77e54a1f 263#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 264static int min_sched_granularity_ns = 100000; /* 100 usecs */
265static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
266static int min_wakeup_granularity_ns; /* 0 usecs */
267static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
cbee9f88 268#ifdef CONFIG_SMP
1983a922
CE		 269static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
270static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
cbee9f88
PZ		 271#endif /* CONFIG_SMP */
272#endif /* CONFIG_SCHED_DEBUG */
77e54a1f 273
5e771905
MG		 274#ifdef CONFIG_COMPACTION
275static int min_extfrag_threshold;
276static int max_extfrag_threshold = 1000;
277#endif
278
d8217f07 279static struct ctl_table kern_table[] = {
2bba22c5 280 {
2bba22c5
MG		 281 .procname = "sched_child_runs_first",
282 .data = &sysctl_sched_child_runs_first,
283 .maxlen = sizeof(unsigned int),
284 .mode = 0644,
6d456111 285 .proc_handler = proc_dointvec,
2bba22c5 286 },
77e54a1f
IM		 287#ifdef CONFIG_SCHED_DEBUG
288 {
b2be5e96
PZ		 289 .procname = "sched_min_granularity_ns",
290 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 291 .maxlen = sizeof(unsigned int),
292 .mode = 0644,
702a7c76 293 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 294 .extra1 = &min_sched_granularity_ns,
295 .extra2 = &max_sched_granularity_ns,
77e54a1f 296 },
21805085 297 {
21805085
PZ		 298 .procname = "sched_latency_ns",
299 .data = &sysctl_sched_latency,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
702a7c76 302 .proc_handler = sched_proc_update_handler,
21805085
PZ		 303 .extra1 = &min_sched_granularity_ns,
304 .extra2 = &max_sched_granularity_ns,
305 },
77e54a1f 306 {
77e54a1f
IM		 307 .procname = "sched_wakeup_granularity_ns",
308 .data = &sysctl_sched_wakeup_granularity,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
702a7c76 311 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 312 .extra1 = &min_wakeup_granularity_ns,
313 .extra2 = &max_wakeup_granularity_ns,
314 },
cbee9f88 315#ifdef CONFIG_SMP
1983a922 316 {
1983a922
CE		 317 .procname = "sched_tunable_scaling",
318 .data = &sysctl_sched_tunable_scaling,
319 .maxlen = sizeof(enum sched_tunable_scaling),
320 .mode = 0644,
702a7c76 321 .proc_handler = sched_proc_update_handler,
1983a922
CE		 322 .extra1 = &min_sched_tunable_scaling,
323 .extra2 = &max_sched_tunable_scaling,
2398f2c6 324 },
da84d961 325 {
d00535db 326 .procname = "sched_migration_cost_ns",
da84d961
IM		 327 .data = &sysctl_sched_migration_cost,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
6d456111 330 .proc_handler = proc_dointvec,
da84d961 331 },
b82d9fdd 332 {
b82d9fdd
PZ		 333 .procname = "sched_nr_migrate",
334 .data = &sysctl_sched_nr_migrate,
335 .maxlen = sizeof(unsigned int),
fa85ae24 336 .mode = 0644,
6d456111 337 .proc_handler = proc_dointvec,
fa85ae24 338 },
e9e9250b 339 {
d00535db 340 .procname = "sched_time_avg_ms",
e9e9250b
PZ		 341 .data = &sysctl_sched_time_avg,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
6d456111 344 .proc_handler = proc_dointvec,
e9e9250b 345 },
a7a4f8a7 346 {
d00535db 347 .procname = "sched_shares_window_ns",
a7a4f8a7
PT		 348 .data = &sysctl_sched_shares_window,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec,
352 },
cbee9f88
PZ		 353#endif /* CONFIG_SMP */
354#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 355 {
356 .procname = "numa_balancing_scan_delay_ms",
357 .data = &sysctl_numa_balancing_scan_delay,
358 .maxlen = sizeof(unsigned int),
359 .mode = 0644,
360 .proc_handler = proc_dointvec,
361 },
cbee9f88
PZ		 362 {
363 .procname = "numa_balancing_scan_period_min_ms",
364 .data = &sysctl_numa_balancing_scan_period_min,
365 .maxlen = sizeof(unsigned int),
366 .mode = 0644,
367 .proc_handler = proc_dointvec,
368 },
369 {
370 .procname = "numa_balancing_scan_period_max_ms",
371 .data = &sysctl_numa_balancing_scan_period_max,
372 .maxlen = sizeof(unsigned int),
373 .mode = 0644,
374 .proc_handler = proc_dointvec,
375 },
6e5fb223
PZ		 376 {
377 .procname = "numa_balancing_scan_size_mb",
378 .data = &sysctl_numa_balancing_scan_size,
379 .maxlen = sizeof(unsigned int),
380 .mode = 0644,
64192658
KT		 381 .proc_handler = proc_dointvec_minmax,
382 .extra1 = &one,
6e5fb223 383 },
54a43d54
AK		 384 {
385 .procname = "numa_balancing",
386 .data = NULL, /* filled in by handler */
387 .maxlen = sizeof(unsigned int),
388 .mode = 0644,
389 .proc_handler = sysctl_numa_balancing,
390 .extra1 = &zero,
391 .extra2 = &one,
392 },
cbee9f88
PZ		 393#endif /* CONFIG_NUMA_BALANCING */
394#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 395 {
9f0c1e56
PZ		 396 .procname = "sched_rt_period_us",
397 .data = &sysctl_sched_rt_period,
398 .maxlen = sizeof(unsigned int),
399 .mode = 0644,
6d456111 400 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 401 },
402 {
9f0c1e56
PZ		 403 .procname = "sched_rt_runtime_us",
404 .data = &sysctl_sched_rt_runtime,
405 .maxlen = sizeof(int),
406 .mode = 0644,
6d456111 407 .proc_handler = sched_rt_handler,
9f0c1e56 408 },
ce0dbbbb
CW		 409 {
410 .procname = "sched_rr_timeslice_ms",
411 .data = &sched_rr_timeslice,
412 .maxlen = sizeof(int),
413 .mode = 0644,
414 .proc_handler = sched_rr_handler,
415 },
5091faa4
MG		 416#ifdef CONFIG_SCHED_AUTOGROUP
417 {
418 .procname = "sched_autogroup_enabled",
419 .data = &sysctl_sched_autogroup_enabled,
420 .maxlen = sizeof(unsigned int),
421 .mode = 0644,
1747b21f 422 .proc_handler = proc_dointvec_minmax,
5091faa4
MG		 423 .extra1 = &zero,
424 .extra2 = &one,
425 },
426#endif
ec12cb7f
PT		 427#ifdef CONFIG_CFS_BANDWIDTH
428 {
429 .procname = "sched_cfs_bandwidth_slice_us",
430 .data = &sysctl_sched_cfs_bandwidth_slice,
431 .maxlen = sizeof(unsigned int),
432 .mode = 0644,
433 .proc_handler = proc_dointvec_minmax,
434 .extra1 = &one,
435 },
436#endif
f20786ff
PZ		 437#ifdef CONFIG_PROVE_LOCKING
438 {
f20786ff
PZ		 439 .procname = "prove_locking",
440 .data = &prove_locking,
441 .maxlen = sizeof(int),
442 .mode = 0644,
6d456111 443 .proc_handler = proc_dointvec,
f20786ff
PZ		 444 },
445#endif
446#ifdef CONFIG_LOCK_STAT
447 {
f20786ff
PZ		 448 .procname = "lock_stat",
449 .data = &lock_stat,
450 .maxlen = sizeof(int),
451 .mode = 0644,
6d456111 452 .proc_handler = proc_dointvec,
f20786ff 453 },
77e54a1f 454#endif
1da177e4 455 {
1da177e4
LT		 456 .procname = "panic",
457 .data = &panic_timeout,
458 .maxlen = sizeof(int),
459 .mode = 0644,
6d456111 460 .proc_handler = proc_dointvec,
1da177e4 461 },
046d662f 462#ifdef CONFIG_COREDUMP
1da177e4 463 {
1da177e4
LT		 464 .procname = "core_uses_pid",
465 .data = &core_uses_pid,
466 .maxlen = sizeof(int),
467 .mode = 0644,
6d456111 468 .proc_handler = proc_dointvec,
1da177e4
LT		 469 },
470 {
1da177e4
LT		 471 .procname = "core_pattern",
472 .data = core_pattern,
71ce92f3 473 .maxlen = CORENAME_MAX_SIZE,
1da177e4 474 .mode = 0644,
54b50199 475 .proc_handler = proc_dostring_coredump,
1da177e4 476 },
a293980c 477 {
a293980c
NH		 478 .procname = "core_pipe_limit",
479 .data = &core_pipe_limit,
480 .maxlen = sizeof(unsigned int),
481 .mode = 0644,
6d456111 482 .proc_handler = proc_dointvec,
a293980c 483 },
046d662f 484#endif
34f5a398 485#ifdef CONFIG_PROC_SYSCTL
1da177e4 486 {
1da177e4 487 .procname = "tainted",
25ddbb18 488 .maxlen = sizeof(long),
34f5a398 489 .mode = 0644,
6d456111 490 .proc_handler = proc_taint,
1da177e4 491 },
f4aacea2
KC		 492 {
493 .procname = "sysctl_writes_strict",
494 .data = &sysctl_writes_strict,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec_minmax,
498 .extra1 = &neg_one,
499 .extra2 = &one,
500 },
34f5a398 501#endif
9745512c
AV		 502#ifdef CONFIG_LATENCYTOP
503 {
504 .procname = "latencytop",
505 .data = &latencytop_enabled,
506 .maxlen = sizeof(int),
507 .mode = 0644,
6d456111 508 .proc_handler = proc_dointvec,
9745512c
AV		 509 },
510#endif
1da177e4
LT		 511#ifdef CONFIG_BLK_DEV_INITRD
512 {
1da177e4
LT		 513 .procname = "real-root-dev",
514 .data = &real_root_dev,
515 .maxlen = sizeof(int),
516 .mode = 0644,
6d456111 517 .proc_handler = proc_dointvec,
1da177e4
LT		 518 },
519#endif
45807a1d 520 {
45807a1d
IM		 521 .procname = "print-fatal-signals",
522 .data = &print_fatal_signals,
523 .maxlen = sizeof(int),
524 .mode = 0644,
6d456111 525 .proc_handler = proc_dointvec,
45807a1d 526 },
72c57ed5 527#ifdef CONFIG_SPARC
1da177e4 528 {
1da177e4
LT		 529 .procname = "reboot-cmd",
530 .data = reboot_command,
531 .maxlen = 256,
532 .mode = 0644,
6d456111 533 .proc_handler = proc_dostring,
1da177e4
LT		 534 },
535 {
1da177e4
LT		 536 .procname = "stop-a",
537 .data = &stop_a_enabled,
538 .maxlen = sizeof (int),
539 .mode = 0644,
6d456111 540 .proc_handler = proc_dointvec,
1da177e4
LT		 541 },
542 {
1da177e4
LT		 543 .procname = "scons-poweroff",
544 .data = &scons_pwroff,
545 .maxlen = sizeof (int),
546 .mode = 0644,
6d456111 547 .proc_handler = proc_dointvec,
1da177e4
LT		 548 },
549#endif
0871420f
DM		 550#ifdef CONFIG_SPARC64
551 {
0871420f
DM		 552 .procname = "tsb-ratio",
553 .data = &sysctl_tsb_ratio,
554 .maxlen = sizeof (int),
555 .mode = 0644,
6d456111 556 .proc_handler = proc_dointvec,
0871420f
DM		 557 },
558#endif
1da177e4
LT		 559#ifdef __hppa__
560 {
1da177e4
LT		 561 .procname = "soft-power",
562 .data = &pwrsw_enabled,
563 .maxlen = sizeof (int),
564 .mode = 0644,
6d456111 565 .proc_handler = proc_dointvec,
1da177e4 566 },
bf14e3b9
VG		 567#endif
568#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 569 {
1da177e4
LT		 570 .procname = "unaligned-trap",
571 .data = &unaligned_enabled,
572 .maxlen = sizeof (int),
573 .mode = 0644,
6d456111 574 .proc_handler = proc_dointvec,
1da177e4
LT		 575 },
576#endif
577 {
1da177e4
LT		 578 .procname = "ctrl-alt-del",
579 .data = &C_A_D,
580 .maxlen = sizeof(int),
581 .mode = 0644,
6d456111 582 .proc_handler = proc_dointvec,
1da177e4 583 },
606576ce 584#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 585 {
b0fc494f
SR		 586 .procname = "ftrace_enabled",
587 .data = &ftrace_enabled,
588 .maxlen = sizeof(int),
589 .mode = 0644,
6d456111 590 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 591 },
592#endif
f38f1d2a
SR		 593#ifdef CONFIG_STACK_TRACER
594 {
f38f1d2a
SR		 595 .procname = "stack_tracer_enabled",
596 .data = &stack_tracer_enabled,
597 .maxlen = sizeof(int),
598 .mode = 0644,
6d456111 599 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 600 },
601#endif
944ac425
SR		 602#ifdef CONFIG_TRACING
603 {
3299b4dd 604 .procname = "ftrace_dump_on_oops",
944ac425
SR		 605 .data = &ftrace_dump_on_oops,
606 .maxlen = sizeof(int),
607 .mode = 0644,
6d456111 608 .proc_handler = proc_dointvec,
944ac425 609 },
de7edd31
SRRH		 610 {
611 .procname = "traceoff_on_warning",
612 .data = &__disable_trace_on_warning,
613 .maxlen = sizeof(__disable_trace_on_warning),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
0daa2302
SRRH		 617 {
618 .procname = "tracepoint_printk",
619 .data = &tracepoint_printk,
620 .maxlen = sizeof(tracepoint_printk),
621 .mode = 0644,
622 .proc_handler = proc_dointvec,
623 },
944ac425 624#endif
2965faa5 625#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 626 {
627 .procname = "kexec_load_disabled",
628 .data = &kexec_load_disabled,
629 .maxlen = sizeof(int),
630 .mode = 0644,
631 /* only handle a transition from default "0" to "1" */
632 .proc_handler = proc_dointvec_minmax,
633 .extra1 = &one,
634 .extra2 = &one,
635 },
636#endif
a1ef5adb 637#ifdef CONFIG_MODULES
1da177e4 638 {
1da177e4
LT		 639 .procname = "modprobe",
640 .data = &modprobe_path,
641 .maxlen = KMOD_PATH_LEN,
642 .mode = 0644,
6d456111 643 .proc_handler = proc_dostring,
1da177e4 644 },
3d43321b 645 {
3d43321b
KC		 646 .procname = "modules_disabled",
647 .data = &modules_disabled,
648 .maxlen = sizeof(int),
649 .mode = 0644,
650 /* only handle a transition from default "0" to "1" */
6d456111 651 .proc_handler = proc_dointvec_minmax,
3d43321b
KC		 652 .extra1 = &one,
653 .extra2 = &one,
654 },
1da177e4 655#endif
86d56134 656#ifdef CONFIG_UEVENT_HELPER
1da177e4 657 {
1da177e4 658 .procname = "hotplug",
312c004d
KS		 659 .data = &uevent_helper,
660 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 661 .mode = 0644,
6d456111 662 .proc_handler = proc_dostring,
1da177e4 663 },
86d56134 664#endif
1da177e4
LT		 665#ifdef CONFIG_CHR_DEV_SG
666 {
1da177e4
LT		 667 .procname = "sg-big-buff",
668 .data = &sg_big_buff,
669 .maxlen = sizeof (int),
670 .mode = 0444,
6d456111 671 .proc_handler = proc_dointvec,
1da177e4
LT		 672 },
673#endif
674#ifdef CONFIG_BSD_PROCESS_ACCT
675 {
1da177e4
LT		 676 .procname = "acct",
677 .data = &acct_parm,
678 .maxlen = 3*sizeof(int),
679 .mode = 0644,
6d456111 680 .proc_handler = proc_dointvec,
1da177e4
LT		 681 },
682#endif
1da177e4
LT		 683#ifdef CONFIG_MAGIC_SYSRQ
684 {
1da177e4 685 .procname = "sysrq",
5d6f647f 686 .data = &__sysrq_enabled,
1da177e4
LT		 687 .maxlen = sizeof (int),
688 .mode = 0644,
97f5f0cd 689 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 690 },
691#endif
d6f8ff73 692#ifdef CONFIG_PROC_SYSCTL
1da177e4 693 {
1da177e4 694 .procname = "cad_pid",
9ec52099 695 .data = NULL,
1da177e4
LT		 696 .maxlen = sizeof (int),
697 .mode = 0600,
6d456111 698 .proc_handler = proc_do_cad_pid,
1da177e4 699 },
d6f8ff73 700#endif
1da177e4 701 {
1da177e4 702 .procname = "threads-max",
16db3d3f 703 .data = NULL,
1da177e4
LT		 704 .maxlen = sizeof(int),
705 .mode = 0644,
16db3d3f 706 .proc_handler = sysctl_max_threads,
1da177e4
LT		 707 },
708 {
1da177e4
LT		 709 .procname = "random",
710 .mode = 0555,
711 .child = random_table,
712 },
17f60a7d
EP		 713 {
714 .procname = "usermodehelper",
715 .mode = 0555,
716 .child = usermodehelper_table,
717 },
1da177e4 718 {
1da177e4
LT		 719 .procname = "overflowuid",
720 .data = &overflowuid,
721 .maxlen = sizeof(int),
722 .mode = 0644,
6d456111 723 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 724 .extra1 = &minolduid,
725 .extra2 = &maxolduid,
726 },
727 {
1da177e4
LT		 728 .procname = "overflowgid",
729 .data = &overflowgid,
730 .maxlen = sizeof(int),
731 .mode = 0644,
6d456111 732 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 733 .extra1 = &minolduid,
734 .extra2 = &maxolduid,
735 },
347a8dc3 736#ifdef CONFIG_S390
1da177e4
LT		 737#ifdef CONFIG_MATHEMU
738 {
1da177e4
LT		 739 .procname = "ieee_emulation_warnings",
740 .data = &sysctl_ieee_emulation_warnings,
741 .maxlen = sizeof(int),
742 .mode = 0644,
6d456111 743 .proc_handler = proc_dointvec,
1da177e4 744 },
1da177e4
LT		 745#endif
746 {
1da177e4 747 .procname = "userprocess_debug",
ab3c68ee 748 .data = &show_unhandled_signals,
1da177e4
LT		 749 .maxlen = sizeof(int),
750 .mode = 0644,
6d456111 751 .proc_handler = proc_dointvec,
1da177e4
LT		 752 },
753#endif
754 {
1da177e4
LT		 755 .procname = "pid_max",
756 .data = &pid_max,
757 .maxlen = sizeof (int),
758 .mode = 0644,
6d456111 759 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 760 .extra1 = &pid_max_min,
761 .extra2 = &pid_max_max,
762 },
763 {
1da177e4
LT		 764 .procname = "panic_on_oops",
765 .data = &panic_on_oops,
766 .maxlen = sizeof(int),
767 .mode = 0644,
6d456111 768 .proc_handler = proc_dointvec,
1da177e4 769 },
7ef3d2fd
JP		 770#if defined CONFIG_PRINTK
771 {
7ef3d2fd
JP		 772 .procname = "printk",
773 .data = &console_loglevel,
774 .maxlen = 4*sizeof(int),
775 .mode = 0644,
6d456111 776 .proc_handler = proc_dointvec,
7ef3d2fd 777 },
1da177e4 778 {
1da177e4 779 .procname = "printk_ratelimit",
717115e1 780 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 781 .maxlen = sizeof(int),
782 .mode = 0644,
6d456111 783 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 784 },
785 {
1da177e4 786 .procname = "printk_ratelimit_burst",
717115e1 787 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 788 .maxlen = sizeof(int),
789 .mode = 0644,
6d456111 790 .proc_handler = proc_dointvec,
1da177e4 791 },
af91322e 792 {
af91322e
DY		 793 .procname = "printk_delay",
794 .data = &printk_delay_msec,
795 .maxlen = sizeof(int),
796 .mode = 0644,
6d456111 797 .proc_handler = proc_dointvec_minmax,
af91322e
DY		 798 .extra1 = &zero,
799 .extra2 = &ten_thousand,
800 },
eaf06b24
DR		 801 {
802 .procname = "dmesg_restrict",
803 .data = &dmesg_restrict,
804 .maxlen = sizeof(int),
805 .mode = 0644,
620f6e8e 806 .proc_handler = proc_dointvec_minmax_sysadmin,
eaf06b24
DR		 807 .extra1 = &zero,
808 .extra2 = &one,
809 },
455cd5ab
DR		 810 {
811 .procname = "kptr_restrict",
812 .data = &kptr_restrict,
813 .maxlen = sizeof(int),
814 .mode = 0644,
620f6e8e 815 .proc_handler = proc_dointvec_minmax_sysadmin,
455cd5ab
DR		 816 .extra1 = &zero,
817 .extra2 = &two,
818 },
df6e61d4 819#endif
1da177e4 820 {
1da177e4
LT		 821 .procname = "ngroups_max",
822 .data = &ngroups_max,
823 .maxlen = sizeof (int),
824 .mode = 0444,
6d456111 825 .proc_handler = proc_dointvec,
1da177e4 826 },
73efc039
DB		 827 {
828 .procname = "cap_last_cap",
829 .data = (void *)&cap_last_cap,
830 .maxlen = sizeof(int),
831 .mode = 0444,
832 .proc_handler = proc_dointvec,
833 },
58687acb 834#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 835 {
58687acb 836 .procname = "watchdog",
3c00ea82 837 .data = &watchdog_user_enabled,
504d7cf1
DZ		 838 .maxlen = sizeof (int),
839 .mode = 0644,
195daf66 840 .proc_handler = proc_watchdog,
586692a5
MSB		 841 .extra1 = &zero,
842 .extra2 = &one,
58687acb
DZ		 843 },
844 {
845 .procname = "watchdog_thresh",
586692a5 846 .data = &watchdog_thresh,
58687acb
DZ		 847 .maxlen = sizeof(int),
848 .mode = 0644,
195daf66 849 .proc_handler = proc_watchdog_thresh,
a6572f84 850 .extra1 = &zero,
58687acb 851 .extra2 = &sixty,
504d7cf1 852 },
195daf66
UO		 853 {
854 .procname = "nmi_watchdog",
855 .data = &nmi_watchdog_enabled,
856 .maxlen = sizeof (int),
857 .mode = 0644,
858 .proc_handler = proc_nmi_watchdog,
859 .extra1 = &zero,
860#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
861 .extra2 = &one,
862#else
863 .extra2 = &zero,
864#endif
865 },
866 {
867 .procname = "soft_watchdog",
868 .data = &soft_watchdog_enabled,
869 .maxlen = sizeof (int),
870 .mode = 0644,
871 .proc_handler = proc_soft_watchdog,
872 .extra1 = &zero,
873 .extra2 = &one,
874 },
fe4ba3c3
CM		 875 {
876 .procname = "watchdog_cpumask",
877 .data = &watchdog_cpumask_bits,
878 .maxlen = NR_CPUS,
879 .mode = 0644,
880 .proc_handler = proc_watchdog_cpumask,
881 },
2508ce18
DZ		 882 {
883 .procname = "softlockup_panic",
884 .data = &softlockup_panic,
885 .maxlen = sizeof(int),
886 .mode = 0644,
887 .proc_handler = proc_dointvec_minmax,
888 .extra1 = &zero,
889 .extra2 = &one,
890 },
ac1f5912
DZ		 891#ifdef CONFIG_HARDLOCKUP_DETECTOR
892 {
893 .procname = "hardlockup_panic",
894 .data = &hardlockup_panic,
895 .maxlen = sizeof(int),
896 .mode = 0644,
897 .proc_handler = proc_dointvec_minmax,
898 .extra1 = &zero,
899 .extra2 = &one,
900 },
901#endif
ed235875
AT		 902#ifdef CONFIG_SMP
903 {
904 .procname = "softlockup_all_cpu_backtrace",
905 .data = &sysctl_softlockup_all_cpu_backtrace,
906 .maxlen = sizeof(int),
907 .mode = 0644,
908 .proc_handler = proc_dointvec_minmax,
909 .extra1 = &zero,
910 .extra2 = &one,
911 },
55537871
JK		 912 {
913 .procname = "hardlockup_all_cpu_backtrace",
914 .data = &sysctl_hardlockup_all_cpu_backtrace,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = proc_dointvec_minmax,
918 .extra1 = &zero,
919 .extra2 = &one,
920 },
ed235875 921#endif /* CONFIG_SMP */
5dc30558
DZ		 922#endif
923#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
924 {
925 .procname = "unknown_nmi_panic",
926 .data = &unknown_nmi_panic,
927 .maxlen = sizeof (int),
928 .mode = 0644,
929 .proc_handler = proc_dointvec,
930 },
504d7cf1 931#endif
1da177e4 932#if defined(CONFIG_X86)
8da5adda 933 {
8da5adda
DZ		 934 .procname = "panic_on_unrecovered_nmi",
935 .data = &panic_on_unrecovered_nmi,
936 .maxlen = sizeof(int),
937 .mode = 0644,
6d456111 938 .proc_handler = proc_dointvec,
8da5adda 939 },
5211a242 940 {
5211a242
KG		 941 .procname = "panic_on_io_nmi",
942 .data = &panic_on_io_nmi,
943 .maxlen = sizeof(int),
944 .mode = 0644,
6d456111 945 .proc_handler = proc_dointvec,
5211a242 946 },
55af7796
MH		 947#ifdef CONFIG_DEBUG_STACKOVERFLOW
948 {
949 .procname = "panic_on_stackoverflow",
950 .data = &sysctl_panic_on_stackoverflow,
951 .maxlen = sizeof(int),
952 .mode = 0644,
953 .proc_handler = proc_dointvec,
954 },
955#endif
1da177e4 956 {
1da177e4
LT		 957 .procname = "bootloader_type",
958 .data = &bootloader_type,
959 .maxlen = sizeof (int),
960 .mode = 0444,
6d456111 961 .proc_handler = proc_dointvec,
1da177e4 962 },
5031296c 963 {
5031296c
PA		 964 .procname = "bootloader_version",
965 .data = &bootloader_version,
966 .maxlen = sizeof (int),
967 .mode = 0444,
6d456111 968 .proc_handler = proc_dointvec,
5031296c 969 },
0741f4d2 970 {
0741f4d2
CE		 971 .procname = "kstack_depth_to_print",
972 .data = &kstack_depth_to_print,
973 .maxlen = sizeof(int),
974 .mode = 0644,
6d456111 975 .proc_handler = proc_dointvec,
0741f4d2 976 },
6e7c4025 977 {
6e7c4025
IM		 978 .procname = "io_delay_type",
979 .data = &io_delay_type,
980 .maxlen = sizeof(int),
981 .mode = 0644,
6d456111 982 .proc_handler = proc_dointvec,
6e7c4025 983 },
1da177e4 984#endif
7a9166e3 985#if defined(CONFIG_MMU)
1da177e4 986 {
1da177e4
LT		 987 .procname = "randomize_va_space",
988 .data = &randomize_va_space,
989 .maxlen = sizeof(int),
990 .mode = 0644,
6d456111 991 .proc_handler = proc_dointvec,
1da177e4 992 },
7a9166e3 993#endif
0152fb37 994#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 995 {
951f22d5
MS		 996 .procname = "spin_retry",
997 .data = &spin_retry,
998 .maxlen = sizeof (int),
999 .mode = 0644,
6d456111 1000 .proc_handler = proc_dointvec,
951f22d5 1001 },
c255d844 1002#endif
673d5b43 1003#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1004 {
c255d844 1005 .procname = "acpi_video_flags",
77afcf78 1006 .data = &acpi_realmode_flags,
c255d844
PM		 1007 .maxlen = sizeof (unsigned long),
1008 .mode = 0644,
6d456111 1009 .proc_handler = proc_doulongvec_minmax,
c255d844 1010 },
d2b176ed 1011#endif
b6fca725 1012#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1013 {
d2b176ed
JS		 1014 .procname = "ignore-unaligned-usertrap",
1015 .data = &no_unaligned_warning,
1016 .maxlen = sizeof (int),
1017 .mode = 0644,
6d456111 1018 .proc_handler = proc_dointvec,
d2b176ed 1019 },
b6fca725
VG		 1020#endif
1021#ifdef CONFIG_IA64
88fc241f 1022 {
88fc241f
DC		 1023 .procname = "unaligned-dump-stack",
1024 .data = &unaligned_dump_stack,
1025 .maxlen = sizeof (int),
1026 .mode = 0644,
6d456111 1027 .proc_handler = proc_dointvec,
88fc241f 1028 },
bebfa101 1029#endif
e162b39a
MSB		 1030#ifdef CONFIG_DETECT_HUNG_TASK
1031 {
e162b39a
MSB		 1032 .procname = "hung_task_panic",
1033 .data = &sysctl_hung_task_panic,
1034 .maxlen = sizeof(int),
1035 .mode = 0644,
6d456111 1036 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 1037 .extra1 = &zero,
1038 .extra2 = &one,
1039 },
82a1fcb9 1040 {
82a1fcb9
IM		 1041 .procname = "hung_task_check_count",
1042 .data = &sysctl_hung_task_check_count,
cd64647f 1043 .maxlen = sizeof(int),
82a1fcb9 1044 .mode = 0644,
cd64647f
LZ		 1045 .proc_handler = proc_dointvec_minmax,
1046 .extra1 = &zero,
82a1fcb9
IM		 1047 },
1048 {
82a1fcb9
IM		 1049 .procname = "hung_task_timeout_secs",
1050 .data = &sysctl_hung_task_timeout_secs,
90739081 1051 .maxlen = sizeof(unsigned long),
82a1fcb9 1052 .mode = 0644,
6d456111 1053 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1054 .extra2 = &hung_task_timeout_max,
82a1fcb9
IM		 1055 },
1056 {
82a1fcb9
IM		 1057 .procname = "hung_task_warnings",
1058 .data = &sysctl_hung_task_warnings,
270750db 1059 .maxlen = sizeof(int),
82a1fcb9 1060 .mode = 0644,
270750db
AT		 1061 .proc_handler = proc_dointvec_minmax,
1062 .extra1 = &neg_one,
82a1fcb9 1063 },
c4f3b63f 1064#endif
bebfa101
AK		 1065#ifdef CONFIG_COMPAT
1066 {
bebfa101
AK		 1067 .procname = "compat-log",
1068 .data = &compat_log,
1069 .maxlen = sizeof (int),
1070 .mode = 0644,
6d456111 1071 .proc_handler = proc_dointvec,
bebfa101 1072 },
951f22d5 1073#endif
23f78d4a
IM		 1074#ifdef CONFIG_RT_MUTEXES
1075 {
23f78d4a
IM		 1076 .procname = "max_lock_depth",
1077 .data = &max_lock_depth,
1078 .maxlen = sizeof(int),
1079 .mode = 0644,
6d456111 1080 .proc_handler = proc_dointvec,
23f78d4a 1081 },
5096add8 1082#endif
10a0a8d4 1083 {
10a0a8d4
JF		 1084 .procname = "poweroff_cmd",
1085 .data = &poweroff_cmd,
1086 .maxlen = POWEROFF_CMD_PATH_LEN,
1087 .mode = 0644,
6d456111 1088 .proc_handler = proc_dostring,
10a0a8d4 1089 },
0b77f5bf
DH		 1090#ifdef CONFIG_KEYS
1091 {
0b77f5bf
DH		 1092 .procname = "keys",
1093 .mode = 0555,
1094 .child = key_sysctls,
1095 },
1096#endif
cdd6c482 1097#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1098 /*
1099 * User-space scripts rely on the existence of this file
1100 * as a feature check for perf_events being enabled.
1101 *
1102 * So it's an ABI, do not remove!
1103 */
1ccd1549 1104 {
cdd6c482
IM		 1105 .procname = "perf_event_paranoid",
1106 .data = &sysctl_perf_event_paranoid,
1107 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1108 .mode = 0644,
6d456111 1109 .proc_handler = proc_dointvec,
1ccd1549 1110 },
c5078f78 1111 {
cdd6c482
IM		 1112 .procname = "perf_event_mlock_kb",
1113 .data = &sysctl_perf_event_mlock,
1114 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1115 .mode = 0644,
6d456111 1116 .proc_handler = proc_dointvec,
c5078f78 1117 },
a78ac325 1118 {
cdd6c482
IM		 1119 .procname = "perf_event_max_sample_rate",
1120 .data = &sysctl_perf_event_sample_rate,
1121 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1122 .mode = 0644,
163ec435 1123 .proc_handler = perf_proc_update_handler,
723478c8 1124 .extra1 = &one,
a78ac325 1125 },
14c63f17
DH		 1126 {
1127 .procname = "perf_cpu_time_max_percent",
1128 .data = &sysctl_perf_cpu_time_max_percent,
1129 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1130 .mode = 0644,
1131 .proc_handler = perf_cpu_time_max_percent_handler,
1132 .extra1 = &zero,
1133 .extra2 = &one_hundred,
1134 },
1ccd1549 1135#endif
dfec072e
VN		 1136#ifdef CONFIG_KMEMCHECK
1137 {
dfec072e
VN		 1138 .procname = "kmemcheck",
1139 .data = &kmemcheck_enabled,
1140 .maxlen = sizeof(int),
1141 .mode = 0644,
6d456111 1142 .proc_handler = proc_dointvec,
dfec072e 1143 },
cb684b5b 1144#endif
9e3961a0
PB		 1145 {
1146 .procname = "panic_on_warn",
1147 .data = &panic_on_warn,
1148 .maxlen = sizeof(int),
1149 .mode = 0644,
1150 .proc_handler = proc_dointvec_minmax,
1151 .extra1 = &zero,
1152 .extra2 = &one,
1153 },
bc7a34b8
TG		 1154#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1155 {
1156 .procname = "timer_migration",
1157 .data = &sysctl_timer_migration,
1158 .maxlen = sizeof(unsigned int),
1159 .mode = 0644,
1160 .proc_handler = timer_migration_handler,
1161 },
1be7f75d
AS		 1162#endif
1163#ifdef CONFIG_BPF_SYSCALL
1164 {
1165 .procname = "unprivileged_bpf_disabled",
1166 .data = &sysctl_unprivileged_bpf_disabled,
1167 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1168 .mode = 0644,
1169 /* only handle a transition from default "0" to "1" */
1170 .proc_handler = proc_dointvec_minmax,
1171 .extra1 = &one,
1172 .extra2 = &one,
1173 },
bc7a34b8 1174#endif
6fce56ec 1175 { }
1da177e4
LT		 1176};
1177
d8217f07 1178static struct ctl_table vm_table[] = {
1da177e4 1179 {
1da177e4
LT		 1180 .procname = "overcommit_memory",
1181 .data = &sysctl_overcommit_memory,
1182 .maxlen = sizeof(sysctl_overcommit_memory),
1183 .mode = 0644,
cb16e95f
PH		 1184 .proc_handler = proc_dointvec_minmax,
1185 .extra1 = &zero,
1186 .extra2 = &two,
1da177e4 1187 },
fadd8fbd 1188 {
fadd8fbd
KH		 1189 .procname = "panic_on_oom",
1190 .data = &sysctl_panic_on_oom,
1191 .maxlen = sizeof(sysctl_panic_on_oom),
1192 .mode = 0644,
cb16e95f
PH		 1193 .proc_handler = proc_dointvec_minmax,
1194 .extra1 = &zero,
1195 .extra2 = &two,
fadd8fbd 1196 },
fe071d7e 1197 {
fe071d7e
DR		 1198 .procname = "oom_kill_allocating_task",
1199 .data = &sysctl_oom_kill_allocating_task,
1200 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1201 .mode = 0644,
6d456111 1202 .proc_handler = proc_dointvec,
fe071d7e 1203 },
fef1bdd6 1204 {
fef1bdd6
DR		 1205 .procname = "oom_dump_tasks",
1206 .data = &sysctl_oom_dump_tasks,
1207 .maxlen = sizeof(sysctl_oom_dump_tasks),
1208 .mode = 0644,
6d456111 1209 .proc_handler = proc_dointvec,
fef1bdd6 1210 },
1da177e4 1211 {
1da177e4
LT		 1212 .procname = "overcommit_ratio",
1213 .data = &sysctl_overcommit_ratio,
1214 .maxlen = sizeof(sysctl_overcommit_ratio),
1215 .mode = 0644,
49f0ce5f
JM		 1216 .proc_handler = overcommit_ratio_handler,
1217 },
1218 {
1219 .procname = "overcommit_kbytes",
1220 .data = &sysctl_overcommit_kbytes,
1221 .maxlen = sizeof(sysctl_overcommit_kbytes),
1222 .mode = 0644,
1223 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1224 },
1225 {
1da177e4
LT		 1226 .procname = "page-cluster",
1227 .data = &page_cluster,
1228 .maxlen = sizeof(int),
1229 .mode = 0644,
cb16e95f
PH		 1230 .proc_handler = proc_dointvec_minmax,
1231 .extra1 = &zero,
1da177e4
LT		 1232 },
1233 {
1da177e4
LT		 1234 .procname = "dirty_background_ratio",
1235 .data = &dirty_background_ratio,
1236 .maxlen = sizeof(dirty_background_ratio),
1237 .mode = 0644,
6d456111 1238 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1239 .extra1 = &zero,
1240 .extra2 = &one_hundred,
1241 },
2da02997 1242 {
2da02997
DR		 1243 .procname = "dirty_background_bytes",
1244 .data = &dirty_background_bytes,
1245 .maxlen = sizeof(dirty_background_bytes),
1246 .mode = 0644,
6d456111 1247 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1248 .extra1 = &one_ul,
2da02997 1249 },
1da177e4 1250 {
1da177e4
LT		 1251 .procname = "dirty_ratio",
1252 .data = &vm_dirty_ratio,
1253 .maxlen = sizeof(vm_dirty_ratio),
1254 .mode = 0644,
6d456111 1255 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1256 .extra1 = &zero,
1257 .extra2 = &one_hundred,
1258 },
2da02997 1259 {
2da02997
DR		 1260 .procname = "dirty_bytes",
1261 .data = &vm_dirty_bytes,
1262 .maxlen = sizeof(vm_dirty_bytes),
1263 .mode = 0644,
6d456111 1264 .proc_handler = dirty_bytes_handler,
9e4a5bda 1265 .extra1 = &dirty_bytes_min,
2da02997 1266 },
1da177e4 1267 {
1da177e4 1268 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1269 .data = &dirty_writeback_interval,
1270 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1271 .mode = 0644,
6d456111 1272 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1273 },
1274 {
1da177e4 1275 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1276 .data = &dirty_expire_interval,
1277 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1278 .mode = 0644,
cb16e95f
PH		 1279 .proc_handler = proc_dointvec_minmax,
1280 .extra1 = &zero,
1da177e4 1281 },
1efff914
TT		 1282 {
1283 .procname = "dirtytime_expire_seconds",
1284 .data = &dirtytime_expire_interval,
1285 .maxlen = sizeof(dirty_expire_interval),
1286 .mode = 0644,
1287 .proc_handler = dirtytime_interval_handler,
1288 .extra1 = &zero,
1289 },
1da177e4 1290 {
3965c9ae
WL		 1291 .procname = "nr_pdflush_threads",
1292 .mode = 0444 /* read-only */,
1293 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1294 },
1295 {
1da177e4
LT		 1296 .procname = "swappiness",
1297 .data = &vm_swappiness,
1298 .maxlen = sizeof(vm_swappiness),
1299 .mode = 0644,
6d456111 1300 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1301 .extra1 = &zero,
1302 .extra2 = &one_hundred,
1303 },
1304#ifdef CONFIG_HUGETLB_PAGE
06808b08 1305 {
1da177e4 1306 .procname = "nr_hugepages",
e5ff2159 1307 .data = NULL,
1da177e4
LT		 1308 .maxlen = sizeof(unsigned long),
1309 .mode = 0644,
6d456111 1310 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1311 },
1312#ifdef CONFIG_NUMA
1313 {
1314 .procname = "nr_hugepages_mempolicy",
1315 .data = NULL,
1316 .maxlen = sizeof(unsigned long),
1317 .mode = 0644,
1318 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1319 },
1320#endif
1da177e4 1321 {
1da177e4
LT		 1322 .procname = "hugetlb_shm_group",
1323 .data = &sysctl_hugetlb_shm_group,
1324 .maxlen = sizeof(gid_t),
1325 .mode = 0644,
6d456111 1326 .proc_handler = proc_dointvec,
1da177e4 1327 },
396faf03 1328 {
396faf03
MG		 1329 .procname = "hugepages_treat_as_movable",
1330 .data = &hugepages_treat_as_movable,
1331 .maxlen = sizeof(int),
1332 .mode = 0644,
86cdb465 1333 .proc_handler = proc_dointvec,
396faf03 1334 },
d1c3fb1f 1335 {
d1c3fb1f 1336 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1337 .data = NULL,
1338 .maxlen = sizeof(unsigned long),
d1c3fb1f 1339 .mode = 0644,
6d456111 1340 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1341 },
1da177e4
LT		 1342#endif
1343 {
1da177e4
LT		 1344 .procname = "lowmem_reserve_ratio",
1345 .data = &sysctl_lowmem_reserve_ratio,
1346 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1347 .mode = 0644,
6d456111 1348 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1349 },
9d0243bc 1350 {
9d0243bc
AM		 1351 .procname = "drop_caches",
1352 .data = &sysctl_drop_caches,
1353 .maxlen = sizeof(int),
1354 .mode = 0644,
1355 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1356 .extra1 = &one,
5509a5d2 1357 .extra2 = &four,
9d0243bc 1358 },
76ab0f53
MG		 1359#ifdef CONFIG_COMPACTION
1360 {
1361 .procname = "compact_memory",
1362 .data = &sysctl_compact_memory,
1363 .maxlen = sizeof(int),
1364 .mode = 0200,
1365 .proc_handler = sysctl_compaction_handler,
1366 },
5e771905
MG		 1367 {
1368 .procname = "extfrag_threshold",
1369 .data = &sysctl_extfrag_threshold,
1370 .maxlen = sizeof(int),
1371 .mode = 0644,
1372 .proc_handler = sysctl_extfrag_handler,
1373 .extra1 = &min_extfrag_threshold,
1374 .extra2 = &max_extfrag_threshold,
1375 },
5bbe3547
EM		 1376 {
1377 .procname = "compact_unevictable_allowed",
1378 .data = &sysctl_compact_unevictable_allowed,
1379 .maxlen = sizeof(int),
1380 .mode = 0644,
1381 .proc_handler = proc_dointvec,
1382 .extra1 = &zero,
1383 .extra2 = &one,
1384 },
5e771905 1385
76ab0f53 1386#endif /* CONFIG_COMPACTION */
1da177e4 1387 {
1da177e4
LT		 1388 .procname = "min_free_kbytes",
1389 .data = &min_free_kbytes,
1390 .maxlen = sizeof(min_free_kbytes),
1391 .mode = 0644,
6d456111 1392 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1393 .extra1 = &zero,
1394 },
8ad4b1fb 1395 {
8ad4b1fb
RS		 1396 .procname = "percpu_pagelist_fraction",
1397 .data = &percpu_pagelist_fraction,
1398 .maxlen = sizeof(percpu_pagelist_fraction),
1399 .mode = 0644,
6d456111 1400 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1401 .extra1 = &zero,
8ad4b1fb 1402 },
1da177e4
LT		 1403#ifdef CONFIG_MMU
1404 {
1da177e4
LT		 1405 .procname = "max_map_count",
1406 .data = &sysctl_max_map_count,
1407 .maxlen = sizeof(sysctl_max_map_count),
1408 .mode = 0644,
3e26120c 1409 .proc_handler = proc_dointvec_minmax,
70da2340 1410 .extra1 = &zero,
1da177e4 1411 },
dd8632a1
PM		 1412#else
1413 {
dd8632a1
PM		 1414 .procname = "nr_trim_pages",
1415 .data = &sysctl_nr_trim_pages,
1416 .maxlen = sizeof(sysctl_nr_trim_pages),
1417 .mode = 0644,
6d456111 1418 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1419 .extra1 = &zero,
1420 },
1da177e4
LT		 1421#endif
1422 {
1da177e4
LT		 1423 .procname = "laptop_mode",
1424 .data = &laptop_mode,
1425 .maxlen = sizeof(laptop_mode),
1426 .mode = 0644,
6d456111 1427 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1428 },
1429 {
1da177e4
LT		 1430 .procname = "block_dump",
1431 .data = &block_dump,
1432 .maxlen = sizeof(block_dump),
1433 .mode = 0644,
6d456111 1434 .proc_handler = proc_dointvec,
1da177e4
LT		 1435 .extra1 = &zero,
1436 },
1437 {
1da177e4
LT		 1438 .procname = "vfs_cache_pressure",
1439 .data = &sysctl_vfs_cache_pressure,
1440 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1441 .mode = 0644,
6d456111 1442 .proc_handler = proc_dointvec,
1da177e4
LT		 1443 .extra1 = &zero,
1444 },
1445#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1446 {
1da177e4
LT		 1447 .procname = "legacy_va_layout",
1448 .data = &sysctl_legacy_va_layout,
1449 .maxlen = sizeof(sysctl_legacy_va_layout),
1450 .mode = 0644,
6d456111 1451 .proc_handler = proc_dointvec,
1da177e4
LT		 1452 .extra1 = &zero,
1453 },
1454#endif
1743660b
CL		 1455#ifdef CONFIG_NUMA
1456 {
1743660b
CL		 1457 .procname = "zone_reclaim_mode",
1458 .data = &zone_reclaim_mode,
1459 .maxlen = sizeof(zone_reclaim_mode),
1460 .mode = 0644,
6d456111 1461 .proc_handler = proc_dointvec,
c84db23c 1462 .extra1 = &zero,
1743660b 1463 },
9614634f 1464 {
9614634f
CL		 1465 .procname = "min_unmapped_ratio",
1466 .data = &sysctl_min_unmapped_ratio,
1467 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1468 .mode = 0644,
6d456111 1469 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1470 .extra1 = &zero,
1471 .extra2 = &one_hundred,
1472 },
0ff38490 1473 {
0ff38490
CL		 1474 .procname = "min_slab_ratio",
1475 .data = &sysctl_min_slab_ratio,
1476 .maxlen = sizeof(sysctl_min_slab_ratio),
1477 .mode = 0644,
6d456111 1478 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1479 .extra1 = &zero,
1480 .extra2 = &one_hundred,
1481 },
e6e5494c 1482#endif
77461ab3
CL		 1483#ifdef CONFIG_SMP
1484 {
77461ab3
CL		 1485 .procname = "stat_interval",
1486 .data = &sysctl_stat_interval,
1487 .maxlen = sizeof(sysctl_stat_interval),
1488 .mode = 0644,
6d456111 1489 .proc_handler = proc_dointvec_jiffies,
77461ab3
CL		 1490 },
1491#endif
6e141546 1492#ifdef CONFIG_MMU
ed032189 1493 {
ed032189 1494 .procname = "mmap_min_addr",
788084ab
EP		 1495 .data = &dac_mmap_min_addr,
1496 .maxlen = sizeof(unsigned long),
ed032189 1497 .mode = 0644,
6d456111 1498 .proc_handler = mmap_min_addr_handler,
ed032189 1499 },
6e141546 1500#endif
f0c0b2b8
KH		 1501#ifdef CONFIG_NUMA
1502 {
f0c0b2b8
KH		 1503 .procname = "numa_zonelist_order",
1504 .data = &numa_zonelist_order,
1505 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1506 .mode = 0644,
6d456111 1507 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1508 },
1509#endif
2b8232ce 1510#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1511 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1512 {
e6e5494c 1513 .procname = "vdso_enabled",
3d7ee969
AL		 1514#ifdef CONFIG_X86_32
1515 .data = &vdso32_enabled,
1516 .maxlen = sizeof(vdso32_enabled),
1517#else
e6e5494c
IM		 1518 .data = &vdso_enabled,
1519 .maxlen = sizeof(vdso_enabled),
3d7ee969 1520#endif
e6e5494c 1521 .mode = 0644,
6d456111 1522 .proc_handler = proc_dointvec,
e6e5494c
IM		 1523 .extra1 = &zero,
1524 },
1da177e4 1525#endif
195cf453
BG		 1526#ifdef CONFIG_HIGHMEM
1527 {
195cf453
BG		 1528 .procname = "highmem_is_dirtyable",
1529 .data = &vm_highmem_is_dirtyable,
1530 .maxlen = sizeof(vm_highmem_is_dirtyable),
1531 .mode = 0644,
6d456111 1532 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1533 .extra1 = &zero,
1534 .extra2 = &one,
1535 },
1536#endif
6a46079c
AK		 1537#ifdef CONFIG_MEMORY_FAILURE
1538 {
6a46079c
AK		 1539 .procname = "memory_failure_early_kill",
1540 .data = &sysctl_memory_failure_early_kill,
1541 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1542 .mode = 0644,
6d456111 1543 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1544 .extra1 = &zero,
1545 .extra2 = &one,
1546 },
1547 {
6a46079c
AK		 1548 .procname = "memory_failure_recovery",
1549 .data = &sysctl_memory_failure_recovery,
1550 .maxlen = sizeof(sysctl_memory_failure_recovery),
1551 .mode = 0644,
6d456111 1552 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1553 .extra1 = &zero,
1554 .extra2 = &one,
1555 },
1556#endif
c9b1d098
AS		 1557 {
1558 .procname = "user_reserve_kbytes",
1559 .data = &sysctl_user_reserve_kbytes,
1560 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1561 .mode = 0644,
1562 .proc_handler = proc_doulongvec_minmax,
1563 },
4eeab4f5
AS		 1564 {
1565 .procname = "admin_reserve_kbytes",
1566 .data = &sysctl_admin_reserve_kbytes,
1567 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1568 .mode = 0644,
1569 .proc_handler = proc_doulongvec_minmax,
1570 },
6fce56ec 1571 { }
1da177e4
LT		 1572};
1573
d8217f07 1574static struct ctl_table fs_table[] = {
1da177e4 1575 {
1da177e4
LT		 1576 .procname = "inode-nr",
1577 .data = &inodes_stat,
3942c07c 1578 .maxlen = 2*sizeof(long),
1da177e4 1579 .mode = 0444,
cffbc8aa 1580 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1581 },
1582 {
1da177e4
LT		 1583 .procname = "inode-state",
1584 .data = &inodes_stat,
3942c07c 1585 .maxlen = 7*sizeof(long),
1da177e4 1586 .mode = 0444,
cffbc8aa 1587 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1588 },
1589 {
1da177e4
LT		 1590 .procname = "file-nr",
1591 .data = &files_stat,
518de9b3 1592 .maxlen = sizeof(files_stat),
1da177e4 1593 .mode = 0444,
6d456111 1594 .proc_handler = proc_nr_files,
1da177e4
LT		 1595 },
1596 {
1da177e4
LT		 1597 .procname = "file-max",
1598 .data = &files_stat.max_files,
518de9b3 1599 .maxlen = sizeof(files_stat.max_files),
1da177e4 1600 .mode = 0644,
518de9b3 1601 .proc_handler = proc_doulongvec_minmax,
1da177e4 1602 },
9cfe015a 1603 {
9cfe015a
ED		 1604 .procname = "nr_open",
1605 .data = &sysctl_nr_open,
1606 .maxlen = sizeof(int),
1607 .mode = 0644,
6d456111 1608 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1609 .extra1 = &sysctl_nr_open_min,
1610 .extra2 = &sysctl_nr_open_max,
9cfe015a 1611 },
1da177e4 1612 {
1da177e4
LT		 1613 .procname = "dentry-state",
1614 .data = &dentry_stat,
3942c07c 1615 .maxlen = 6*sizeof(long),
1da177e4 1616 .mode = 0444,
312d3ca8 1617 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1618 },
1619 {
1da177e4
LT		 1620 .procname = "overflowuid",
1621 .data = &fs_overflowuid,
1622 .maxlen = sizeof(int),
1623 .mode = 0644,
6d456111 1624 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1625 .extra1 = &minolduid,
1626 .extra2 = &maxolduid,
1627 },
1628 {
1da177e4
LT		 1629 .procname = "overflowgid",
1630 .data = &fs_overflowgid,
1631 .maxlen = sizeof(int),
1632 .mode = 0644,
6d456111 1633 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1634 .extra1 = &minolduid,
1635 .extra2 = &maxolduid,
1636 },
bfcd17a6 1637#ifdef CONFIG_FILE_LOCKING
1da177e4 1638 {
1da177e4
LT		 1639 .procname = "leases-enable",
1640 .data = &leases_enable,
1641 .maxlen = sizeof(int),
1642 .mode = 0644,
6d456111 1643 .proc_handler = proc_dointvec,
1da177e4 1644 },
bfcd17a6 1645#endif
1da177e4
LT		 1646#ifdef CONFIG_DNOTIFY
1647 {
1da177e4
LT		 1648 .procname = "dir-notify-enable",
1649 .data = &dir_notify_enable,
1650 .maxlen = sizeof(int),
1651 .mode = 0644,
6d456111 1652 .proc_handler = proc_dointvec,
1da177e4
LT		 1653 },
1654#endif
1655#ifdef CONFIG_MMU
bfcd17a6 1656#ifdef CONFIG_FILE_LOCKING
1da177e4 1657 {
1da177e4
LT		 1658 .procname = "lease-break-time",
1659 .data = &lease_break_time,
1660 .maxlen = sizeof(int),
1661 .mode = 0644,
6d456111 1662 .proc_handler = proc_dointvec,
1da177e4 1663 },
bfcd17a6 1664#endif
ebf3f09c 1665#ifdef CONFIG_AIO
1da177e4 1666 {
1da177e4
LT		 1667 .procname = "aio-nr",
1668 .data = &aio_nr,
1669 .maxlen = sizeof(aio_nr),
1670 .mode = 0444,
6d456111 1671 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1672 },
1673 {
1da177e4
LT		 1674 .procname = "aio-max-nr",
1675 .data = &aio_max_nr,
1676 .maxlen = sizeof(aio_max_nr),
1677 .mode = 0644,
6d456111 1678 .proc_handler = proc_doulongvec_minmax,
1da177e4 1679 },
ebf3f09c 1680#endif /* CONFIG_AIO */
2d9048e2 1681#ifdef CONFIG_INOTIFY_USER
0399cb08 1682 {
0399cb08
RL		 1683 .procname = "inotify",
1684 .mode = 0555,
1685 .child = inotify_table,
1686 },
1687#endif
7ef9964e
DL		 1688#ifdef CONFIG_EPOLL
1689 {
1690 .procname = "epoll",
1691 .mode = 0555,
1692 .child = epoll_table,
1693 },
1694#endif
1da177e4 1695#endif
800179c9
KC		 1696 {
1697 .procname = "protected_symlinks",
1698 .data = &sysctl_protected_symlinks,
1699 .maxlen = sizeof(int),
1700 .mode = 0600,
1701 .proc_handler = proc_dointvec_minmax,
1702 .extra1 = &zero,
1703 .extra2 = &one,
1704 },
1705 {
1706 .procname = "protected_hardlinks",
1707 .data = &sysctl_protected_hardlinks,
1708 .maxlen = sizeof(int),
1709 .mode = 0600,
1710 .proc_handler = proc_dointvec_minmax,
1711 .extra1 = &zero,
1712 .extra2 = &one,
1713 },
d6e71144 1714 {
d6e71144
AC		 1715 .procname = "suid_dumpable",
1716 .data = &suid_dumpable,
1717 .maxlen = sizeof(int),
1718 .mode = 0644,
54b50199 1719 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1720 .extra1 = &zero,
1721 .extra2 = &two,
d6e71144 1722 },
2abc26fc
EB		 1723#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1724 {
2abc26fc
EB		 1725 .procname = "binfmt_misc",
1726 .mode = 0555,
f9bd6733 1727 .child = sysctl_mount_point,
2abc26fc
EB		 1728 },
1729#endif
b492e95b 1730 {
ff9da691
JA		 1731 .procname = "pipe-max-size",
1732 .data = &pipe_max_size,
b492e95b
JA		 1733 .maxlen = sizeof(int),
1734 .mode = 0644,
ff9da691
JA		 1735 .proc_handler = &pipe_proc_fn,
1736 .extra1 = &pipe_min_size,
b492e95b 1737 },
6fce56ec 1738 { }
1da177e4
LT		 1739};
1740
d8217f07 1741static struct ctl_table debug_table[] = {
7ac57a89 1742#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1743 {
abd4f750
MAS		 1744 .procname = "exception-trace",
1745 .data = &show_unhandled_signals,
1746 .maxlen = sizeof(int),
1747 .mode = 0644,
1748 .proc_handler = proc_dointvec
1749 },
b2be84df
MH		 1750#endif
1751#if defined(CONFIG_OPTPROBES)
1752 {
1753 .procname = "kprobes-optimization",
1754 .data = &sysctl_kprobes_optimization,
1755 .maxlen = sizeof(int),
1756 .mode = 0644,
1757 .proc_handler = proc_kprobes_optimization_handler,
1758 .extra1 = &zero,
1759 .extra2 = &one,
1760 },
abd4f750 1761#endif
6fce56ec 1762 { }
1da177e4
LT		 1763};
1764
d8217f07 1765static struct ctl_table dev_table[] = {
6fce56ec 1766 { }
0eeca283 1767};
1da177e4 1768
de4e83bd 1769int __init sysctl_init(void)
d912b0cc 1770{
fd4b616b
SR		 1771 struct ctl_table_header *hdr;
1772
1773 hdr = register_sysctl_table(sysctl_base_table);
1774 kmemleak_not_leak(hdr);
d912b0cc
EB		 1775 return 0;
1776}
1777
b89a8171
EB		 1778#endif /* CONFIG_SYSCTL */
1779
1da177e4
LT		 1780/*
1781 * /proc/sys support
1782 */
1783
b89a8171 1784#ifdef CONFIG_PROC_SYSCTL
1da177e4 1785
f8808300
KC		 1786static int _proc_do_string(char *data, int maxlen, int write,
1787 char __user *buffer,
b1ba4ddd 1788 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1789{
1790 size_t len;
1791 char __user *p;
1792 char c;
8d060877
ON		 1793
1794 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1795 *lenp = 0;
1796 return 0;
1797 }
8d060877 1798
1da177e4 1799 if (write) {
f4aacea2
KC		 1800 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1801 /* Only continue writes not past the end of buffer. */
1802 len = strlen(data);
1803 if (len > maxlen - 1)
1804 len = maxlen - 1;
1805
1806 if (*ppos > len)
1807 return 0;
1808 len = *ppos;
1809 } else {
1810 /* Start writing from beginning of buffer. */
1811 len = 0;
1812 }
1813
2ca9bb45 1814 *ppos += *lenp;
1da177e4 1815 p = buffer;
2ca9bb45 1816 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1817 if (get_user(c, p++))
1818 return -EFAULT;
1819 if (c == 0 || c == '\n')
1820 break;
2ca9bb45 1821 data[len++] = c;
1da177e4 1822 }
f8808300 1823 data[len] = 0;
1da177e4 1824 } else {
f5dd3d6f
SV		 1825 len = strlen(data);
1826 if (len > maxlen)
1827 len = maxlen;
8d060877
ON		 1828
1829 if (*ppos > len) {
1830 *lenp = 0;
1831 return 0;
1832 }
1833
1834 data += *ppos;
1835 len -= *ppos;
1836
1da177e4
LT		 1837 if (len > *lenp)
1838 len = *lenp;
1839 if (len)
f8808300 1840 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1841 return -EFAULT;
1842 if (len < *lenp) {
f8808300 1843 if (put_user('\n', buffer + len))
1da177e4
LT		 1844 return -EFAULT;
1845 len++;
1846 }
1847 *lenp = len;
1848 *ppos += len;
1849 }
1850 return 0;
1851}
1852
f4aacea2
KC		 1853static void warn_sysctl_write(struct ctl_table *table)
1854{
1855 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1856 "This will not be supported in the future. To silence this\n"
1857 "warning, set kernel.sysctl_writes_strict = -1\n",
1858 current->comm, table->procname);
1859}
1860
f5dd3d6f
SV		 1861/**
1862 * proc_dostring - read a string sysctl
1863 * @table: the sysctl table
1864 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 1865 * @buffer: the user buffer
1866 * @lenp: the size of the user buffer
1867 * @ppos: file position
1868 *
1869 * Reads/writes a string from/to the user buffer. If the kernel
1870 * buffer provided is not large enough to hold the string, the
1871 * string is truncated. The copied string is %NULL-terminated.
1872 * If the string is being read by the user process, it is copied
1873 * and a newline '\n' is added. It is truncated if the buffer is
1874 * not large enough.
1875 *
1876 * Returns 0 on success.
1877 */
8d65af78 1878int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 1879 void __user *buffer, size_t *lenp, loff_t *ppos)
1880{
f4aacea2
KC		 1881 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1882 warn_sysctl_write(table);
1883
f8808300
KC		 1884 return _proc_do_string((char *)(table->data), table->maxlen, write,
1885 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 1886}
1887
00b7c339
AW		 1888static size_t proc_skip_spaces(char **buf)
1889{
1890 size_t ret;
1891 char *tmp = skip_spaces(*buf);
1892 ret = tmp - *buf;
1893 *buf = tmp;
1894 return ret;
1895}
1896
9f977fb7
OP		 1897static void proc_skip_char(char **buf, size_t *size, const char v)
1898{
1899 while (*size) {
1900 if (**buf != v)
1901 break;
1902 (*size)--;
1903 (*buf)++;
1904 }
1905}
1906
00b7c339
AW		 1907#define TMPBUFLEN 22
1908/**
0fc377bd 1909 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 1910 *
0fc377bd
RD		 1911 * @buf: a kernel buffer
1912 * @size: size of the kernel buffer
1913 * @val: this is where the number will be stored
1914 * @neg: set to %TRUE if number is negative
1915 * @perm_tr: a vector which contains the allowed trailers
1916 * @perm_tr_len: size of the perm_tr vector
1917 * @tr: pointer to store the trailer character
00b7c339 1918 *
0fc377bd
RD		 1919 * In case of success %0 is returned and @buf and @size are updated with
1920 * the amount of bytes read. If @tr is non-NULL and a trailing
1921 * character exists (size is non-zero after returning from this
1922 * function), @tr is updated with the trailing character.
00b7c339
AW		 1923 */
1924static int proc_get_long(char **buf, size_t *size,
1925 unsigned long *val, bool *neg,
1926 const char *perm_tr, unsigned perm_tr_len, char *tr)
1927{
1928 int len;
1929 char *p, tmp[TMPBUFLEN];
1930
1931 if (!*size)
1932 return -EINVAL;
1933
1934 len = *size;
1935 if (len > TMPBUFLEN - 1)
1936 len = TMPBUFLEN - 1;
1937
1938 memcpy(tmp, *buf, len);
1939
1940 tmp[len] = 0;
1941 p = tmp;
1942 if (*p == '-' && *size > 1) {
1943 *neg = true;
1944 p++;
1945 } else
1946 *neg = false;
1947 if (!isdigit(*p))
1948 return -EINVAL;
1949
1950 *val = simple_strtoul(p, &p, 0);
1951
1952 len = p - tmp;
1953
1954 /* We don't know if the next char is whitespace thus we may accept
1955 * invalid integers (e.g. 1234...a) or two integers instead of one
1956 * (e.g. 123...1). So lets not allow such large numbers. */
1957 if (len == TMPBUFLEN - 1)
1958 return -EINVAL;
1959
1960 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1961 return -EINVAL;
1da177e4 1962
00b7c339
AW		 1963 if (tr && (len < *size))
1964 *tr = *p;
1965
1966 *buf += len;
1967 *size -= len;
1968
1969 return 0;
1970}
1971
1972/**
0fc377bd 1973 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 1974 *
0fc377bd
RD		 1975 * @buf: the user buffer
1976 * @size: the size of the user buffer
1977 * @val: the integer to be converted
1978 * @neg: sign of the number, %TRUE for negative
00b7c339 1979 *
0fc377bd
RD		 1980 * In case of success %0 is returned and @buf and @size are updated with
1981 * the amount of bytes written.
00b7c339
AW		 1982 */
1983static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1984 bool neg)
1985{
1986 int len;
1987 char tmp[TMPBUFLEN], *p = tmp;
1988
1989 sprintf(p, "%s%lu", neg ? "-" : "", val);
1990 len = strlen(tmp);
1991 if (len > *size)
1992 len = *size;
1993 if (copy_to_user(*buf, tmp, len))
1994 return -EFAULT;
1995 *size -= len;
1996 *buf += len;
1997 return 0;
1998}
1999#undef TMPBUFLEN
2000
2001static int proc_put_char(void __user **buf, size_t *size, char c)
2002{
2003 if (*size) {
2004 char __user **buffer = (char __user **)buf;
2005 if (put_user(c, *buffer))
2006 return -EFAULT;
2007 (*size)--, (*buffer)++;
2008 *buf = *buffer;
2009 }
2010 return 0;
2011}
1da177e4 2012
00b7c339 2013static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2014 int *valp,
2015 int write, void *data)
2016{
2017 if (write) {
230633d1
HS		 2018 if (*negp) {
2019 if (*lvalp > (unsigned long) INT_MAX + 1)
2020 return -EINVAL;
2021 *valp = -*lvalp;
2022 } else {
2023 if (*lvalp > (unsigned long) INT_MAX)
2024 return -EINVAL;
2025 *valp = *lvalp;
2026 }
1da177e4
LT		 2027 } else {
2028 int val = *valp;
2029 if (val < 0) {
00b7c339 2030 *negp = true;
9a5bc726 2031 *lvalp = -(unsigned long)val;
1da177e4 2032 } else {
00b7c339 2033 *negp = false;
1da177e4
LT		 2034 *lvalp = (unsigned long)val;
2035 }
2036 }
2037 return 0;
2038}
2039
00b7c339
AW		 2040static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2041
d8217f07 2042static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2043 int write, void __user *buffer,
fcfbd547 2044 size_t *lenp, loff_t *ppos,
00b7c339 2045 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2046 int write, void *data),
2047 void *data)
2048{
00b7c339
AW		 2049 int *i, vleft, first = 1, err = 0;
2050 unsigned long page = 0;
2051 size_t left;
2052 char *kbuf;
1da177e4 2053
00b7c339 2054 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2055 *lenp = 0;
2056 return 0;
2057 }
2058
fcfbd547 2059 i = (int *) tbl_data;
1da177e4
LT		 2060 vleft = table->maxlen / sizeof(*i);
2061 left = *lenp;
2062
2063 if (!conv)
2064 conv = do_proc_dointvec_conv;
2065
00b7c339 2066 if (write) {
f4aacea2
KC		 2067 if (*ppos) {
2068 switch (sysctl_writes_strict) {
2069 case SYSCTL_WRITES_STRICT:
2070 goto out;
2071 case SYSCTL_WRITES_WARN:
2072 warn_sysctl_write(table);
2073 break;
2074 default:
2075 break;
2076 }
2077 }
2078
00b7c339
AW		 2079 if (left > PAGE_SIZE - 1)
2080 left = PAGE_SIZE - 1;
2081 page = __get_free_page(GFP_TEMPORARY);
2082 kbuf = (char *) page;
2083 if (!kbuf)
2084 return -ENOMEM;
2085 if (copy_from_user(kbuf, buffer, left)) {
2086 err = -EFAULT;
2087 goto free;
2088 }
2089 kbuf[left] = 0;
2090 }
2091
1da177e4 2092 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2093 unsigned long lval;
2094 bool neg;
1da177e4 2095
00b7c339
AW		 2096 if (write) {
2097 left -= proc_skip_spaces(&kbuf);
1da177e4 2098
563b0467
O		 2099 if (!left)
2100 break;
00b7c339
AW		 2101 err = proc_get_long(&kbuf, &left, &lval, &neg,
2102 proc_wspace_sep,
2103 sizeof(proc_wspace_sep), NULL);
2104 if (err)
1da177e4 2105 break;
00b7c339
AW		 2106 if (conv(&neg, &lval, i, 1, data)) {
2107 err = -EINVAL;
1da177e4 2108 break;
00b7c339 2109 }
1da177e4 2110 } else {
00b7c339
AW		 2111 if (conv(&neg, &lval, i, 0, data)) {
2112 err = -EINVAL;
2113 break;
2114 }
1da177e4 2115 if (!first)
00b7c339
AW		 2116 err = proc_put_char(&buffer, &left, '\t');
2117 if (err)
2118 break;
2119 err = proc_put_long(&buffer, &left, lval, neg);
2120 if (err)
1da177e4 2121 break;
1da177e4
LT		 2122 }
2123 }
2124
00b7c339
AW		 2125 if (!write && !first && left && !err)
2126 err = proc_put_char(&buffer, &left, '\n');
563b0467 2127 if (write && !err && left)
00b7c339
AW		 2128 left -= proc_skip_spaces(&kbuf);
2129free:
1da177e4 2130 if (write) {
00b7c339
AW		 2131 free_page(page);
2132 if (first)
2133 return err ? : -EINVAL;
1da177e4 2134 }
1da177e4 2135 *lenp -= left;
f4aacea2 2136out:
1da177e4 2137 *ppos += *lenp;
00b7c339 2138 return err;
1da177e4
LT		 2139}
2140
8d65af78 2141static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2142 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2143 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2144 int write, void *data),
2145 void *data)
2146{
8d65af78 2147 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2148 buffer, lenp, ppos, conv, data);
2149}
2150
1da177e4
LT		 2151/**
2152 * proc_dointvec - read a vector of integers
2153 * @table: the sysctl table
2154 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2155 * @buffer: the user buffer
2156 * @lenp: the size of the user buffer
2157 * @ppos: file position
2158 *
2159 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2160 * values from/to the user buffer, treated as an ASCII string.
2161 *
2162 * Returns 0 on success.
2163 */
8d65af78 2164int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2165 void __user *buffer, size_t *lenp, loff_t *ppos)
2166{
8d65af78 2167 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2168 NULL,NULL);
2169}
2170
34f5a398 2171/*
25ddbb18
AK		 2172 * Taint values can only be increased
2173 * This means we can safely use a temporary.
34f5a398 2174 */
8d65af78 2175static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2176 void __user *buffer, size_t *lenp, loff_t *ppos)
2177{
25ddbb18
AK		 2178 struct ctl_table t;
2179 unsigned long tmptaint = get_taint();
2180 int err;
34f5a398 2181
91fcd412 2182 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2183 return -EPERM;
2184
25ddbb18
AK		 2185 t = *table;
2186 t.data = &tmptaint;
8d65af78 2187 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2188 if (err < 0)
2189 return err;
2190
2191 if (write) {
2192 /*
2193 * Poor man's atomic or. Not worth adding a primitive
2194 * to everyone's atomic.h for this
2195 */
2196 int i;
2197 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2198 if ((tmptaint >> i) & 1)
373d4d09 2199 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2200 }
2201 }
2202
2203 return err;
34f5a398
TT		 2204}
2205
bfdc0b49 2206#ifdef CONFIG_PRINTK
620f6e8e 2207static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2208 void __user *buffer, size_t *lenp, loff_t *ppos)
2209{
2210 if (write && !capable(CAP_SYS_ADMIN))
2211 return -EPERM;
2212
2213 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2214}
2215#endif
2216
1da177e4
LT		 2217struct do_proc_dointvec_minmax_conv_param {
2218 int *min;
2219 int *max;
2220};
2221
00b7c339
AW		 2222static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2223 int *valp,
1da177e4
LT		 2224 int write, void *data)
2225{
2226 struct do_proc_dointvec_minmax_conv_param *param = data;
2227 if (write) {
2228 int val = *negp ? -*lvalp : *lvalp;
2229 if ((param->min && *param->min > val) ||
2230 (param->max && *param->max < val))
2231 return -EINVAL;
2232 *valp = val;
2233 } else {
2234 int val = *valp;
2235 if (val < 0) {
00b7c339 2236 *negp = true;
9a5bc726 2237 *lvalp = -(unsigned long)val;
1da177e4 2238 } else {
00b7c339 2239 *negp = false;
1da177e4
LT		 2240 *lvalp = (unsigned long)val;
2241 }
2242 }
2243 return 0;
2244}
2245
2246/**
2247 * proc_dointvec_minmax - read a vector of integers with min/max values
2248 * @table: the sysctl table
2249 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2250 * @buffer: the user buffer
2251 * @lenp: the size of the user buffer
2252 * @ppos: file position
2253 *
2254 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2255 * values from/to the user buffer, treated as an ASCII string.
2256 *
2257 * This routine will ensure the values are within the range specified by
2258 * table->extra1 (min) and table->extra2 (max).
2259 *
2260 * Returns 0 on success.
2261 */
8d65af78 2262int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2263 void __user *buffer, size_t *lenp, loff_t *ppos)
2264{
2265 struct do_proc_dointvec_minmax_conv_param param = {
2266 .min = (int *) table->extra1,
2267 .max = (int *) table->extra2,
2268 };
8d65af78 2269 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2270 do_proc_dointvec_minmax_conv, &param);
2271}
2272
54b50199
KC		 2273static void validate_coredump_safety(void)
2274{
046d662f 2275#ifdef CONFIG_COREDUMP
e579d2c2 2276 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199
KC		 2277 core_pattern[0] != '/' && core_pattern[0] != '|') {
2278 printk(KERN_WARNING "Unsafe core_pattern used with "\
2279 "suid_dumpable=2. Pipe handler or fully qualified "\
2280 "core dump path required.\n");
2281 }
046d662f 2282#endif
54b50199
KC		 2283}
2284
2285static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2286 void __user *buffer, size_t *lenp, loff_t *ppos)
2287{
2288 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2289 if (!error)
2290 validate_coredump_safety();
2291 return error;
2292}
2293
046d662f 2294#ifdef CONFIG_COREDUMP
54b50199
KC		 2295static int proc_dostring_coredump(struct ctl_table *table, int write,
2296 void __user *buffer, size_t *lenp, loff_t *ppos)
2297{
2298 int error = proc_dostring(table, write, buffer, lenp, ppos);
2299 if (!error)
2300 validate_coredump_safety();
2301 return error;
2302}
046d662f 2303#endif
54b50199 2304
d8217f07 2305static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2306 void __user *buffer,
2307 size_t *lenp, loff_t *ppos,
2308 unsigned long convmul,
2309 unsigned long convdiv)
2310{
00b7c339
AW		 2311 unsigned long *i, *min, *max;
2312 int vleft, first = 1, err = 0;
2313 unsigned long page = 0;
2314 size_t left;
2315 char *kbuf;
2316
2317 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2318 *lenp = 0;
2319 return 0;
2320 }
00b7c339 2321
fcfbd547 2322 i = (unsigned long *) data;
1da177e4
LT		 2323 min = (unsigned long *) table->extra1;
2324 max = (unsigned long *) table->extra2;
2325 vleft = table->maxlen / sizeof(unsigned long);
2326 left = *lenp;
00b7c339
AW		 2327
2328 if (write) {
f4aacea2
KC		 2329 if (*ppos) {
2330 switch (sysctl_writes_strict) {
2331 case SYSCTL_WRITES_STRICT:
2332 goto out;
2333 case SYSCTL_WRITES_WARN:
2334 warn_sysctl_write(table);
2335 break;
2336 default:
2337 break;
2338 }
2339 }
2340
00b7c339
AW		 2341 if (left > PAGE_SIZE - 1)
2342 left = PAGE_SIZE - 1;
2343 page = __get_free_page(GFP_TEMPORARY);
2344 kbuf = (char *) page;
2345 if (!kbuf)
2346 return -ENOMEM;
2347 if (copy_from_user(kbuf, buffer, left)) {
2348 err = -EFAULT;
2349 goto free;
2350 }
2351 kbuf[left] = 0;
2352 }
2353
27b3d80a 2354 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2355 unsigned long val;
2356
1da177e4 2357 if (write) {
00b7c339
AW		 2358 bool neg;
2359
2360 left -= proc_skip_spaces(&kbuf);
2361
2362 err = proc_get_long(&kbuf, &left, &val, &neg,
2363 proc_wspace_sep,
2364 sizeof(proc_wspace_sep), NULL);
2365 if (err)
1da177e4
LT		 2366 break;
2367 if (neg)
1da177e4
LT		 2368 continue;
2369 if ((min && val < *min) || (max && val > *max))
2370 continue;
2371 *i = val;
2372 } else {
00b7c339 2373 val = convdiv * (*i) / convmul;
7833819d 2374 if (!first) {
00b7c339 2375 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2376 if (err)
2377 break;
2378 }
00b7c339
AW		 2379 err = proc_put_long(&buffer, &left, val, false);
2380 if (err)
2381 break;
1da177e4
LT		 2382 }
2383 }
2384
00b7c339
AW		 2385 if (!write && !first && left && !err)
2386 err = proc_put_char(&buffer, &left, '\n');
2387 if (write && !err)
2388 left -= proc_skip_spaces(&kbuf);
2389free:
1da177e4 2390 if (write) {
00b7c339
AW		 2391 free_page(page);
2392 if (first)
2393 return err ? : -EINVAL;
1da177e4 2394 }
1da177e4 2395 *lenp -= left;
f4aacea2 2396out:
1da177e4 2397 *ppos += *lenp;
00b7c339 2398 return err;
1da177e4
LT		 2399}
2400
d8217f07 2401static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2402 void __user *buffer,
2403 size_t *lenp, loff_t *ppos,
2404 unsigned long convmul,
2405 unsigned long convdiv)
2406{
2407 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2408 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2409}
2410
1da177e4
LT		 2411/**
2412 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2413 * @table: the sysctl table
2414 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2415 * @buffer: the user buffer
2416 * @lenp: the size of the user buffer
2417 * @ppos: file position
2418 *
2419 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2420 * values from/to the user buffer, treated as an ASCII string.
2421 *
2422 * This routine will ensure the values are within the range specified by
2423 * table->extra1 (min) and table->extra2 (max).
2424 *
2425 * Returns 0 on success.
2426 */
8d65af78 2427int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2428 void __user *buffer, size_t *lenp, loff_t *ppos)
2429{
8d65af78 2430 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2431}
2432
2433/**
2434 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2435 * @table: the sysctl table
2436 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2437 * @buffer: the user buffer
2438 * @lenp: the size of the user buffer
2439 * @ppos: file position
2440 *
2441 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2442 * values from/to the user buffer, treated as an ASCII string. The values
2443 * are treated as milliseconds, and converted to jiffies when they are stored.
2444 *
2445 * This routine will ensure the values are within the range specified by
2446 * table->extra1 (min) and table->extra2 (max).
2447 *
2448 * Returns 0 on success.
2449 */
d8217f07 2450int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2451 void __user *buffer,
2452 size_t *lenp, loff_t *ppos)
2453{
8d65af78 2454 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2455 lenp, ppos, HZ, 1000l);
2456}
2457
2458
00b7c339 2459static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2460 int *valp,
2461 int write, void *data)
2462{
2463 if (write) {
cba9f33d
BS		 2464 if (*lvalp > LONG_MAX / HZ)
2465 return 1;
1da177e4
LT		 2466 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2467 } else {
2468 int val = *valp;
2469 unsigned long lval;
2470 if (val < 0) {
00b7c339 2471 *negp = true;
9a5bc726 2472 lval = -(unsigned long)val;
1da177e4 2473 } else {
00b7c339 2474 *negp = false;
1da177e4
LT		 2475 lval = (unsigned long)val;
2476 }
2477 *lvalp = lval / HZ;
2478 }
2479 return 0;
2480}
2481
00b7c339 2482static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2483 int *valp,
2484 int write, void *data)
2485{
2486 if (write) {
cba9f33d
BS		 2487 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2488 return 1;
1da177e4
LT		 2489 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2490 } else {
2491 int val = *valp;
2492 unsigned long lval;
2493 if (val < 0) {
00b7c339 2494 *negp = true;
9a5bc726 2495 lval = -(unsigned long)val;
1da177e4 2496 } else {
00b7c339 2497 *negp = false;
1da177e4
LT		 2498 lval = (unsigned long)val;
2499 }
2500 *lvalp = jiffies_to_clock_t(lval);
2501 }
2502 return 0;
2503}
2504
00b7c339 2505static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2506 int *valp,
2507 int write, void *data)
2508{
2509 if (write) {
d738ce8f
FF		 2510 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2511
2512 if (jif > INT_MAX)
2513 return 1;
2514 *valp = (int)jif;
1da177e4
LT		 2515 } else {
2516 int val = *valp;
2517 unsigned long lval;
2518 if (val < 0) {
00b7c339 2519 *negp = true;
9a5bc726 2520 lval = -(unsigned long)val;
1da177e4 2521 } else {
00b7c339 2522 *negp = false;
1da177e4
LT		 2523 lval = (unsigned long)val;
2524 }
2525 *lvalp = jiffies_to_msecs(lval);
2526 }
2527 return 0;
2528}
2529
2530/**
2531 * proc_dointvec_jiffies - read a vector of integers as seconds
2532 * @table: the sysctl table
2533 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2534 * @buffer: the user buffer
2535 * @lenp: the size of the user buffer
2536 * @ppos: file position
2537 *
2538 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2539 * values from/to the user buffer, treated as an ASCII string.
2540 * The values read are assumed to be in seconds, and are converted into
2541 * jiffies.
2542 *
2543 * Returns 0 on success.
2544 */
8d65af78 2545int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2546 void __user *buffer, size_t *lenp, loff_t *ppos)
2547{
8d65af78 2548 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2549 do_proc_dointvec_jiffies_conv,NULL);
2550}
2551
2552/**
2553 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2554 * @table: the sysctl table
2555 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2556 * @buffer: the user buffer
2557 * @lenp: the size of the user buffer
1e5d5331 2558 * @ppos: pointer to the file position
1da177e4
LT		 2559 *
2560 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2561 * values from/to the user buffer, treated as an ASCII string.
2562 * The values read are assumed to be in 1/USER_HZ seconds, and
2563 * are converted into jiffies.
2564 *
2565 * Returns 0 on success.
2566 */
8d65af78 2567int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2568 void __user *buffer, size_t *lenp, loff_t *ppos)
2569{
8d65af78 2570 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2571 do_proc_dointvec_userhz_jiffies_conv,NULL);
2572}
2573
2574/**
2575 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2576 * @table: the sysctl table
2577 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2578 * @buffer: the user buffer
2579 * @lenp: the size of the user buffer
67be2dd1
MW		 2580 * @ppos: file position
2581 * @ppos: the current position in the file
1da177e4
LT		 2582 *
2583 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2584 * values from/to the user buffer, treated as an ASCII string.
2585 * The values read are assumed to be in 1/1000 seconds, and
2586 * are converted into jiffies.
2587 *
2588 * Returns 0 on success.
2589 */
8d65af78 2590int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2591 void __user *buffer, size_t *lenp, loff_t *ppos)
2592{
8d65af78 2593 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2594 do_proc_dointvec_ms_jiffies_conv, NULL);
2595}
2596
8d65af78 2597static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2598 void __user *buffer, size_t *lenp, loff_t *ppos)
2599{
2600 struct pid *new_pid;
2601 pid_t tmp;
2602 int r;
2603
6c5f3e7b 2604 tmp = pid_vnr(cad_pid);
9ec52099 2605
8d65af78 2606 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2607 lenp, ppos, NULL, NULL);
2608 if (r || !write)
2609 return r;
2610
2611 new_pid = find_get_pid(tmp);
2612 if (!new_pid)
2613 return -ESRCH;
2614
2615 put_pid(xchg(&cad_pid, new_pid));
2616 return 0;
2617}
2618
9f977fb7
OP		 2619/**
2620 * proc_do_large_bitmap - read/write from/to a large bitmap
2621 * @table: the sysctl table
2622 * @write: %TRUE if this is a write to the sysctl file
2623 * @buffer: the user buffer
2624 * @lenp: the size of the user buffer
2625 * @ppos: file position
2626 *
2627 * The bitmap is stored at table->data and the bitmap length (in bits)
2628 * in table->maxlen.
2629 *
2630 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2631 * large bitmaps may be represented in a compact manner. Writing into
2632 * the file will clear the bitmap then update it with the given input.
2633 *
2634 * Returns 0 on success.
2635 */
2636int proc_do_large_bitmap(struct ctl_table *table, int write,
2637 void __user *buffer, size_t *lenp, loff_t *ppos)
2638{
2639 int err = 0;
2640 bool first = 1;
2641 size_t left = *lenp;
2642 unsigned long bitmap_len = table->maxlen;
122ff243 2643 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2644 unsigned long *tmp_bitmap = NULL;
2645 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2646
122ff243 2647 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2648 *lenp = 0;
2649 return 0;
2650 }
2651
2652 if (write) {
2653 unsigned long page = 0;
2654 char *kbuf;
2655
2656 if (left > PAGE_SIZE - 1)
2657 left = PAGE_SIZE - 1;
2658
2659 page = __get_free_page(GFP_TEMPORARY);
2660 kbuf = (char *) page;
2661 if (!kbuf)
2662 return -ENOMEM;
2663 if (copy_from_user(kbuf, buffer, left)) {
2664 free_page(page);
2665 return -EFAULT;
2666 }
2667 kbuf[left] = 0;
2668
2669 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2670 GFP_KERNEL);
2671 if (!tmp_bitmap) {
2672 free_page(page);
2673 return -ENOMEM;
2674 }
2675 proc_skip_char(&kbuf, &left, '\n');
2676 while (!err && left) {
2677 unsigned long val_a, val_b;
2678 bool neg;
2679
2680 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2681 sizeof(tr_a), &c);
2682 if (err)
2683 break;
2684 if (val_a >= bitmap_len || neg) {
2685 err = -EINVAL;
2686 break;
2687 }
2688
2689 val_b = val_a;
2690 if (left) {
2691 kbuf++;
2692 left--;
2693 }
2694
2695 if (c == '-') {
2696 err = proc_get_long(&kbuf, &left, &val_b,
2697 &neg, tr_b, sizeof(tr_b),
2698 &c);
2699 if (err)
2700 break;
2701 if (val_b >= bitmap_len || neg ||
2702 val_a > val_b) {
2703 err = -EINVAL;
2704 break;
2705 }
2706 if (left) {
2707 kbuf++;
2708 left--;
2709 }
2710 }
2711
5a04cca6 2712 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7
OP		 2713 first = 0;
2714 proc_skip_char(&kbuf, &left, '\n');
2715 }
2716 free_page(page);
2717 } else {
2718 unsigned long bit_a, bit_b = 0;
2719
2720 while (left) {
2721 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2722 if (bit_a >= bitmap_len)
2723 break;
2724 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2725 bit_a + 1) - 1;
2726
2727 if (!first) {
2728 err = proc_put_char(&buffer, &left, ',');
2729 if (err)
2730 break;
2731 }
2732 err = proc_put_long(&buffer, &left, bit_a, false);
2733 if (err)
2734 break;
2735 if (bit_a != bit_b) {
2736 err = proc_put_char(&buffer, &left, '-');
2737 if (err)
2738 break;
2739 err = proc_put_long(&buffer, &left, bit_b, false);
2740 if (err)
2741 break;
2742 }
2743
2744 first = 0; bit_b++;
2745 }
2746 if (!err)
2747 err = proc_put_char(&buffer, &left, '\n');
2748 }
2749
2750 if (!err) {
2751 if (write) {
2752 if (*ppos)
2753 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2754 else
5a04cca6 2755 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 2756 }
2757 kfree(tmp_bitmap);
2758 *lenp -= left;
2759 *ppos += *lenp;
2760 return 0;
2761 } else {
2762 kfree(tmp_bitmap);
2763 return err;
2764 }
2765}
2766
55610500 2767#else /* CONFIG_PROC_SYSCTL */
1da177e4 2768
8d65af78 2769int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2770 void __user *buffer, size_t *lenp, loff_t *ppos)
2771{
2772 return -ENOSYS;
2773}
2774
8d65af78 2775int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2776 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2777{
2778 return -ENOSYS;
2779}
2780
8d65af78 2781int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2782 void __user *buffer, size_t *lenp, loff_t *ppos)
2783{
2784 return -ENOSYS;
2785}
2786
8d65af78 2787int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2788 void __user *buffer, size_t *lenp, loff_t *ppos)
2789{
2790 return -ENOSYS;
2791}
2792
8d65af78 2793int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2794 void __user *buffer, size_t *lenp, loff_t *ppos)
2795{
2796 return -ENOSYS;
2797}
2798
8d65af78 2799int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2800 void __user *buffer, size_t *lenp, loff_t *ppos)
2801{
2802 return -ENOSYS;
2803}
2804
8d65af78 2805int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2806 void __user *buffer, size_t *lenp, loff_t *ppos)
2807{
2808 return -ENOSYS;
2809}
2810
d8217f07 2811int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2812 void __user *buffer,
2813 size_t *lenp, loff_t *ppos)
2814{
2815 return -ENOSYS;
2816}
2817
2818
55610500 2819#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2820
1da177e4
LT		 2821/*
2822 * No sense putting this after each symbol definition, twice,
2823 * exception granted :-)
2824 */
2825EXPORT_SYMBOL(proc_dointvec);
2826EXPORT_SYMBOL(proc_dointvec_jiffies);
2827EXPORT_SYMBOL(proc_dointvec_minmax);
2828EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2829EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2830EXPORT_SYMBOL(proc_dostring);
2831EXPORT_SYMBOL(proc_doulongvec_minmax);
2832EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux 6.x block layer and io_uring tree(s)