]> Git Repo - linux.git/blame - kernel/sysctl.c
projects / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge tag 'selinux-pr-20170831' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / kernel / sysctl.c
CommitLineData
1da177e4
LT		 1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
1da177e4 21#include <linux/module.h>
e2e40f2c 22#include <linux/aio.h>
1da177e4
LT		 23#include <linux/mm.h>
24#include <linux/swap.h>
25#include <linux/slab.h>
26#include <linux/sysctl.h>
5a04cca6 27#include <linux/bitmap.h>
d33ed52d 28#include <linux/signal.h>
455cd5ab 29#include <linux/printk.h>
1da177e4 30#include <linux/proc_fs.h>
72c2d582 31#include <linux/security.h>
1da177e4 32#include <linux/ctype.h>
dfec072e 33#include <linux/kmemcheck.h>
fd4b616b 34#include <linux/kmemleak.h>
62239ac2 35#include <linux/fs.h>
1da177e4
LT		 36#include <linux/init.h>
37#include <linux/kernel.h>
0296b228 38#include <linux/kobject.h>
20380731 39#include <linux/net.h>
1da177e4
LT		 40#include <linux/sysrq.h>
41#include <linux/highuid.h>
42#include <linux/writeback.h>
3fff4c42 43#include <linux/ratelimit.h>
76ab0f53 44#include <linux/compaction.h>
1da177e4 45#include <linux/hugetlb.h>
1da177e4 46#include <linux/initrd.h>
0b77f5bf 47#include <linux/key.h>
1da177e4
LT		 48#include <linux/times.h>
49#include <linux/limits.h>
50#include <linux/dcache.h>
6e006701 51#include <linux/dnotify.h>
1da177e4 52#include <linux/syscalls.h>
c748e134 53#include <linux/vmstat.h>
c255d844
PM		 54#include <linux/nfs_fs.h>
55#include <linux/acpi.h>
10a0a8d4 56#include <linux/reboot.h>
b0fc494f 57#include <linux/ftrace.h>
cdd6c482 58#include <linux/perf_event.h>
b2be84df 59#include <linux/kprobes.h>
b492e95b 60#include <linux/pipe_fs_i.h>
8e4228e1 61#include <linux/oom.h>
17f60a7d 62#include <linux/kmod.h>
73efc039 63#include <linux/capability.h>
40401530 64#include <linux/binfmts.h>
cf4aebc2 65#include <linux/sched/sysctl.h>
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>
1da177e4 70
7c0f6ba6 71#include <linux/uaccess.h>
1da177e4
LT		 72#include <asm/processor.h>
73
29cbc78b
AK		 74#ifdef CONFIG_X86
75#include <asm/nmi.h>
0741f4d2 76#include <asm/stacktrace.h>
6e7c4025 77#include <asm/io.h>
29cbc78b 78#endif
d550bbd4
DH		 79#ifdef CONFIG_SPARC
80#include <asm/setup.h>
81#endif
c55b7c3e
DY		 82#ifdef CONFIG_BSD_PROCESS_ACCT
83#include <linux/acct.h>
84#endif
4f0e056f
DY		 85#ifdef CONFIG_RT_MUTEXES
86#include <linux/rtmutex.h>
87#endif
2edf5e49
DY		 88#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89#include <linux/lockdep.h>
90#endif
15485a46
DY		 91#ifdef CONFIG_CHR_DEV_SG
92#include <scsi/sg.h>
93#endif
29cbc78b 94
58687acb 95#ifdef CONFIG_LOCKUP_DETECTOR
504d7cf1
DZ		 96#include <linux/nmi.h>
97#endif
98
1da177e4
LT		 99#if defined(CONFIG_SYSCTL)
100
101/* External variables not in a header file. */
d6e71144 102extern int suid_dumpable;
046d662f
AK		 103#ifdef CONFIG_COREDUMP
104extern int core_uses_pid;
1da177e4 105extern char core_pattern[];
a293980c 106extern unsigned int core_pipe_limit;
046d662f 107#endif
1da177e4 108extern int pid_max;
1da177e4 109extern int pid_max_min, pid_max_max;
8ad4b1fb 110extern int percpu_pagelist_fraction;
9745512c 111extern int latencytop_enabled;
9b80a184 112extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 113#ifndef CONFIG_MMU
114extern int sysctl_nr_trim_pages;
115#endif
1da177e4 116
c4f3b63f 117/* Constants used for minimum and maximum */
2508ce18 118#ifdef CONFIG_LOCKUP_DETECTOR
c4f3b63f
RT		 119static int sixty = 60;
120#endif
121
270750db
AT		 122static int __maybe_unused neg_one = -1;
123
c4f3b63f 124static int zero;
cd5f9a4c
LT		 125static int __maybe_unused one = 1;
126static int __maybe_unused two = 2;
5509a5d2 127static int __maybe_unused four = 4;
fc3501d4 128static unsigned long one_ul = 1;
c4f3b63f 129static int one_hundred = 100;
795ae7a0 130static int one_thousand = 1000;
af91322e
DY		 131#ifdef CONFIG_PRINTK
132static int ten_thousand = 10000;
133#endif
c5dfd78e
ACM		 134#ifdef CONFIG_PERF_EVENTS
135static int six_hundred_forty_kb = 640 * 1024;
136#endif
c4f3b63f 137
9e4a5bda
AR		 138/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
1da177e4
LT		 141/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142static int maxolduid = 65535;
143static int minolduid;
144
145static int ngroups_max = NGROUPS_MAX;
73efc039 146static const int cap_last_cap = CAP_LAST_CAP;
1da177e4 147
80df2847
LH		 148/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149#ifdef CONFIG_DETECT_HUNG_TASK
150static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
151#endif
152
d14f1729
DY		 153#ifdef CONFIG_INOTIFY_USER
154#include <linux/inotify.h>
155#endif
72c57ed5 156#ifdef CONFIG_SPARC
1da177e4
LT		 157#endif
158
159#ifdef __hppa__
160extern int pwrsw_enabled;
bf14e3b9
VG		 161#endif
162
163#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4
LT		 164extern int unaligned_enabled;
165#endif
1da177e4 166
d2b176ed 167#ifdef CONFIG_IA64
88fc241f 168extern int unaligned_dump_stack;
d2b176ed
JS		 169#endif
170
b6fca725
VG		 171#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172extern int no_unaligned_warning;
173#endif
174
d6f8ff73 175#ifdef CONFIG_PROC_SYSCTL
f4aacea2 176
a19ac337
LR		 177/**
178 * enum sysctl_writes_mode - supported sysctl write modes
179 *
180 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
181 * to be written, and multiple writes on the same sysctl file descriptor
182 * will rewrite the sysctl value, regardless of file position. No warning
183 * is issued when the initial position is not 0.
184 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
185 * not 0.
186 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
187 * file position 0 and the value must be fully contained in the buffer
188 * sent to the write syscall. If dealing with strings respect the file
189 * position, but restrict this to the max length of the buffer, anything
190 * passed the max lenght will be ignored. Multiple writes will append
191 * to the buffer.
192 *
193 * These write modes control how current file position affects the behavior of
194 * updating sysctl values through the proc interface on each write.
195 */
196enum sysctl_writes_mode {
197 SYSCTL_WRITES_LEGACY = -1,
198 SYSCTL_WRITES_WARN = 0,
199 SYSCTL_WRITES_STRICT = 1,
200};
f4aacea2 201
a19ac337 202static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
f4aacea2 203
8d65af78 204static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 205 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 206static int proc_taint(struct ctl_table *table, int write,
34f5a398 207 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 208#endif
9ec52099 209
bfdc0b49 210#ifdef CONFIG_PRINTK
620f6e8e 211static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 212 void __user *buffer, size_t *lenp, loff_t *ppos);
213#endif
214
54b50199
KC		 215static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
216 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 217#ifdef CONFIG_COREDUMP
54b50199
KC		 218static int proc_dostring_coredump(struct ctl_table *table, int write,
219 void __user *buffer, size_t *lenp, loff_t *ppos);
046d662f 220#endif
54b50199 221
97f5f0cd 222#ifdef CONFIG_MAGIC_SYSRQ
8c6a98b2 223/* Note: sysrq code uses it's own private copy */
8eaede49 224static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
97f5f0cd 225
6f8fd1d7 226static int sysrq_sysctl_handler(struct ctl_table *table, int write,
97f5f0cd
DT		 227 void __user *buffer, size_t *lenp,
228 loff_t *ppos)
229{
230 int error;
231
232 error = proc_dointvec(table, write, buffer, lenp, ppos);
233 if (error)
234 return error;
235
236 if (write)
237 sysrq_toggle_support(__sysrq_enabled);
238
239 return 0;
240}
241
242#endif
243
d8217f07
EB		 244static struct ctl_table kern_table[];
245static struct ctl_table vm_table[];
246static struct ctl_table fs_table[];
247static struct ctl_table debug_table[];
248static struct ctl_table dev_table[];
249extern struct ctl_table random_table[];
7ef9964e
DL		 250#ifdef CONFIG_EPOLL
251extern struct ctl_table epoll_table[];
252#endif
1da177e4
LT		 253
254#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
255int sysctl_legacy_va_layout;
256#endif
257
1da177e4
LT		 258/* The default sysctl tables: */
259
de4e83bd 260static struct ctl_table sysctl_base_table[] = {
1da177e4 261 {
1da177e4
LT		 262 .procname = "kernel",
263 .mode = 0555,
264 .child = kern_table,
265 },
266 {
1da177e4
LT		 267 .procname = "vm",
268 .mode = 0555,
269 .child = vm_table,
270 },
1da177e4 271 {
1da177e4
LT		 272 .procname = "fs",
273 .mode = 0555,
274 .child = fs_table,
275 },
276 {
1da177e4
LT		 277 .procname = "debug",
278 .mode = 0555,
279 .child = debug_table,
280 },
281 {
1da177e4
LT		 282 .procname = "dev",
283 .mode = 0555,
284 .child = dev_table,
285 },
6fce56ec 286 { }
1da177e4
LT		 287};
288
77e54a1f 289#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 290static int min_sched_granularity_ns = 100000; /* 100 usecs */
291static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
292static int min_wakeup_granularity_ns; /* 0 usecs */
293static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
cbee9f88 294#ifdef CONFIG_SMP
1983a922
CE		 295static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
296static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
cbee9f88
PZ		 297#endif /* CONFIG_SMP */
298#endif /* CONFIG_SCHED_DEBUG */
77e54a1f 299
5e771905
MG		 300#ifdef CONFIG_COMPACTION
301static int min_extfrag_threshold;
302static int max_extfrag_threshold = 1000;
303#endif
304
d8217f07 305static struct ctl_table kern_table[] = {
2bba22c5 306 {
2bba22c5
MG		 307 .procname = "sched_child_runs_first",
308 .data = &sysctl_sched_child_runs_first,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
6d456111 311 .proc_handler = proc_dointvec,
2bba22c5 312 },
77e54a1f
IM		 313#ifdef CONFIG_SCHED_DEBUG
314 {
b2be5e96
PZ		 315 .procname = "sched_min_granularity_ns",
316 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
702a7c76 319 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 320 .extra1 = &min_sched_granularity_ns,
321 .extra2 = &max_sched_granularity_ns,
77e54a1f 322 },
21805085 323 {
21805085
PZ		 324 .procname = "sched_latency_ns",
325 .data = &sysctl_sched_latency,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
702a7c76 328 .proc_handler = sched_proc_update_handler,
21805085
PZ		 329 .extra1 = &min_sched_granularity_ns,
330 .extra2 = &max_sched_granularity_ns,
331 },
77e54a1f 332 {
77e54a1f
IM		 333 .procname = "sched_wakeup_granularity_ns",
334 .data = &sysctl_sched_wakeup_granularity,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
702a7c76 337 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 338 .extra1 = &min_wakeup_granularity_ns,
339 .extra2 = &max_wakeup_granularity_ns,
340 },
cbee9f88 341#ifdef CONFIG_SMP
1983a922 342 {
1983a922
CE		 343 .procname = "sched_tunable_scaling",
344 .data = &sysctl_sched_tunable_scaling,
345 .maxlen = sizeof(enum sched_tunable_scaling),
346 .mode = 0644,
702a7c76 347 .proc_handler = sched_proc_update_handler,
1983a922
CE		 348 .extra1 = &min_sched_tunable_scaling,
349 .extra2 = &max_sched_tunable_scaling,
2398f2c6 350 },
da84d961 351 {
d00535db 352 .procname = "sched_migration_cost_ns",
da84d961
IM		 353 .data = &sysctl_sched_migration_cost,
354 .maxlen = sizeof(unsigned int),
355 .mode = 0644,
6d456111 356 .proc_handler = proc_dointvec,
da84d961 357 },
b82d9fdd 358 {
b82d9fdd
PZ		 359 .procname = "sched_nr_migrate",
360 .data = &sysctl_sched_nr_migrate,
361 .maxlen = sizeof(unsigned int),
fa85ae24 362 .mode = 0644,
6d456111 363 .proc_handler = proc_dointvec,
fa85ae24 364 },
e9e9250b 365 {
d00535db 366 .procname = "sched_time_avg_ms",
e9e9250b
PZ		 367 .data = &sysctl_sched_time_avg,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
6d456111 370 .proc_handler = proc_dointvec,
e9e9250b 371 },
cb251765
MG		 372#ifdef CONFIG_SCHEDSTATS
373 {
374 .procname = "sched_schedstats",
375 .data = NULL,
376 .maxlen = sizeof(unsigned int),
377 .mode = 0644,
378 .proc_handler = sysctl_schedstats,
379 .extra1 = &zero,
380 .extra2 = &one,
381 },
382#endif /* CONFIG_SCHEDSTATS */
cbee9f88
PZ		 383#endif /* CONFIG_SMP */
384#ifdef CONFIG_NUMA_BALANCING
4b96a29b
PZ		 385 {
386 .procname = "numa_balancing_scan_delay_ms",
387 .data = &sysctl_numa_balancing_scan_delay,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec,
391 },
cbee9f88
PZ		 392 {
393 .procname = "numa_balancing_scan_period_min_ms",
394 .data = &sysctl_numa_balancing_scan_period_min,
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec,
398 },
399 {
400 .procname = "numa_balancing_scan_period_max_ms",
401 .data = &sysctl_numa_balancing_scan_period_max,
402 .maxlen = sizeof(unsigned int),
403 .mode = 0644,
404 .proc_handler = proc_dointvec,
405 },
6e5fb223
PZ		 406 {
407 .procname = "numa_balancing_scan_size_mb",
408 .data = &sysctl_numa_balancing_scan_size,
409 .maxlen = sizeof(unsigned int),
410 .mode = 0644,
64192658
KT		 411 .proc_handler = proc_dointvec_minmax,
412 .extra1 = &one,
6e5fb223 413 },
54a43d54
AK		 414 {
415 .procname = "numa_balancing",
416 .data = NULL, /* filled in by handler */
417 .maxlen = sizeof(unsigned int),
418 .mode = 0644,
419 .proc_handler = sysctl_numa_balancing,
420 .extra1 = &zero,
421 .extra2 = &one,
422 },
cbee9f88
PZ		 423#endif /* CONFIG_NUMA_BALANCING */
424#endif /* CONFIG_SCHED_DEBUG */
9f0c1e56 425 {
9f0c1e56
PZ		 426 .procname = "sched_rt_period_us",
427 .data = &sysctl_sched_rt_period,
428 .maxlen = sizeof(unsigned int),
429 .mode = 0644,
6d456111 430 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 431 },
432 {
9f0c1e56
PZ		 433 .procname = "sched_rt_runtime_us",
434 .data = &sysctl_sched_rt_runtime,
435 .maxlen = sizeof(int),
436 .mode = 0644,
6d456111 437 .proc_handler = sched_rt_handler,
9f0c1e56 438 },
ce0dbbbb
CW		 439 {
440 .procname = "sched_rr_timeslice_ms",
975e155e 441 .data = &sysctl_sched_rr_timeslice,
ce0dbbbb
CW		 442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = sched_rr_handler,
445 },
5091faa4
MG		 446#ifdef CONFIG_SCHED_AUTOGROUP
447 {
448 .procname = "sched_autogroup_enabled",
449 .data = &sysctl_sched_autogroup_enabled,
450 .maxlen = sizeof(unsigned int),
451 .mode = 0644,
1747b21f 452 .proc_handler = proc_dointvec_minmax,
5091faa4
MG		 453 .extra1 = &zero,
454 .extra2 = &one,
455 },
456#endif
ec12cb7f
PT		 457#ifdef CONFIG_CFS_BANDWIDTH
458 {
459 .procname = "sched_cfs_bandwidth_slice_us",
460 .data = &sysctl_sched_cfs_bandwidth_slice,
461 .maxlen = sizeof(unsigned int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec_minmax,
464 .extra1 = &one,
465 },
466#endif
f20786ff
PZ		 467#ifdef CONFIG_PROVE_LOCKING
468 {
f20786ff
PZ		 469 .procname = "prove_locking",
470 .data = &prove_locking,
471 .maxlen = sizeof(int),
472 .mode = 0644,
6d456111 473 .proc_handler = proc_dointvec,
f20786ff
PZ		 474 },
475#endif
476#ifdef CONFIG_LOCK_STAT
477 {
f20786ff
PZ		 478 .procname = "lock_stat",
479 .data = &lock_stat,
480 .maxlen = sizeof(int),
481 .mode = 0644,
6d456111 482 .proc_handler = proc_dointvec,
f20786ff 483 },
77e54a1f 484#endif
1da177e4 485 {
1da177e4
LT		 486 .procname = "panic",
487 .data = &panic_timeout,
488 .maxlen = sizeof(int),
489 .mode = 0644,
6d456111 490 .proc_handler = proc_dointvec,
1da177e4 491 },
046d662f 492#ifdef CONFIG_COREDUMP
1da177e4 493 {
1da177e4
LT		 494 .procname = "core_uses_pid",
495 .data = &core_uses_pid,
496 .maxlen = sizeof(int),
497 .mode = 0644,
6d456111 498 .proc_handler = proc_dointvec,
1da177e4
LT		 499 },
500 {
1da177e4
LT		 501 .procname = "core_pattern",
502 .data = core_pattern,
71ce92f3 503 .maxlen = CORENAME_MAX_SIZE,
1da177e4 504 .mode = 0644,
54b50199 505 .proc_handler = proc_dostring_coredump,
1da177e4 506 },
a293980c 507 {
a293980c
NH		 508 .procname = "core_pipe_limit",
509 .data = &core_pipe_limit,
510 .maxlen = sizeof(unsigned int),
511 .mode = 0644,
6d456111 512 .proc_handler = proc_dointvec,
a293980c 513 },
046d662f 514#endif
34f5a398 515#ifdef CONFIG_PROC_SYSCTL
1da177e4 516 {
1da177e4 517 .procname = "tainted",
25ddbb18 518 .maxlen = sizeof(long),
34f5a398 519 .mode = 0644,
6d456111 520 .proc_handler = proc_taint,
1da177e4 521 },
f4aacea2
KC		 522 {
523 .procname = "sysctl_writes_strict",
524 .data = &sysctl_writes_strict,
525 .maxlen = sizeof(int),
526 .mode = 0644,
527 .proc_handler = proc_dointvec_minmax,
528 .extra1 = &neg_one,
529 .extra2 = &one,
530 },
34f5a398 531#endif
9745512c
AV		 532#ifdef CONFIG_LATENCYTOP
533 {
534 .procname = "latencytop",
535 .data = &latencytop_enabled,
536 .maxlen = sizeof(int),
537 .mode = 0644,
cb251765 538 .proc_handler = sysctl_latencytop,
9745512c
AV		 539 },
540#endif
1da177e4
LT		 541#ifdef CONFIG_BLK_DEV_INITRD
542 {
1da177e4
LT		 543 .procname = "real-root-dev",
544 .data = &real_root_dev,
545 .maxlen = sizeof(int),
546 .mode = 0644,
6d456111 547 .proc_handler = proc_dointvec,
1da177e4
LT		 548 },
549#endif
45807a1d 550 {
45807a1d
IM		 551 .procname = "print-fatal-signals",
552 .data = &print_fatal_signals,
553 .maxlen = sizeof(int),
554 .mode = 0644,
6d456111 555 .proc_handler = proc_dointvec,
45807a1d 556 },
72c57ed5 557#ifdef CONFIG_SPARC
1da177e4 558 {
1da177e4
LT		 559 .procname = "reboot-cmd",
560 .data = reboot_command,
561 .maxlen = 256,
562 .mode = 0644,
6d456111 563 .proc_handler = proc_dostring,
1da177e4
LT		 564 },
565 {
1da177e4
LT		 566 .procname = "stop-a",
567 .data = &stop_a_enabled,
568 .maxlen = sizeof (int),
569 .mode = 0644,
6d456111 570 .proc_handler = proc_dointvec,
1da177e4
LT		 571 },
572 {
1da177e4
LT		 573 .procname = "scons-poweroff",
574 .data = &scons_pwroff,
575 .maxlen = sizeof (int),
576 .mode = 0644,
6d456111 577 .proc_handler = proc_dointvec,
1da177e4
LT		 578 },
579#endif
0871420f
DM		 580#ifdef CONFIG_SPARC64
581 {
0871420f
DM		 582 .procname = "tsb-ratio",
583 .data = &sysctl_tsb_ratio,
584 .maxlen = sizeof (int),
585 .mode = 0644,
6d456111 586 .proc_handler = proc_dointvec,
0871420f
DM		 587 },
588#endif
1da177e4
LT		 589#ifdef __hppa__
590 {
1da177e4
LT		 591 .procname = "soft-power",
592 .data = &pwrsw_enabled,
593 .maxlen = sizeof (int),
594 .mode = 0644,
6d456111 595 .proc_handler = proc_dointvec,
1da177e4 596 },
bf14e3b9
VG		 597#endif
598#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1da177e4 599 {
1da177e4
LT		 600 .procname = "unaligned-trap",
601 .data = &unaligned_enabled,
602 .maxlen = sizeof (int),
603 .mode = 0644,
6d456111 604 .proc_handler = proc_dointvec,
1da177e4
LT		 605 },
606#endif
607 {
1da177e4
LT		 608 .procname = "ctrl-alt-del",
609 .data = &C_A_D,
610 .maxlen = sizeof(int),
611 .mode = 0644,
6d456111 612 .proc_handler = proc_dointvec,
1da177e4 613 },
606576ce 614#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 615 {
b0fc494f
SR		 616 .procname = "ftrace_enabled",
617 .data = &ftrace_enabled,
618 .maxlen = sizeof(int),
619 .mode = 0644,
6d456111 620 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 621 },
622#endif
f38f1d2a
SR		 623#ifdef CONFIG_STACK_TRACER
624 {
f38f1d2a
SR		 625 .procname = "stack_tracer_enabled",
626 .data = &stack_tracer_enabled,
627 .maxlen = sizeof(int),
628 .mode = 0644,
6d456111 629 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 630 },
631#endif
944ac425
SR		 632#ifdef CONFIG_TRACING
633 {
3299b4dd 634 .procname = "ftrace_dump_on_oops",
944ac425
SR		 635 .data = &ftrace_dump_on_oops,
636 .maxlen = sizeof(int),
637 .mode = 0644,
6d456111 638 .proc_handler = proc_dointvec,
944ac425 639 },
de7edd31
SRRH		 640 {
641 .procname = "traceoff_on_warning",
642 .data = &__disable_trace_on_warning,
643 .maxlen = sizeof(__disable_trace_on_warning),
644 .mode = 0644,
645 .proc_handler = proc_dointvec,
646 },
0daa2302
SRRH		 647 {
648 .procname = "tracepoint_printk",
649 .data = &tracepoint_printk,
650 .maxlen = sizeof(tracepoint_printk),
651 .mode = 0644,
42391745 652 .proc_handler = tracepoint_printk_sysctl,
0daa2302 653 },
944ac425 654#endif
2965faa5 655#ifdef CONFIG_KEXEC_CORE
7984754b
KC		 656 {
657 .procname = "kexec_load_disabled",
658 .data = &kexec_load_disabled,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 /* only handle a transition from default "0" to "1" */
662 .proc_handler = proc_dointvec_minmax,
663 .extra1 = &one,
664 .extra2 = &one,
665 },
666#endif
a1ef5adb 667#ifdef CONFIG_MODULES
1da177e4 668 {
1da177e4
LT		 669 .procname = "modprobe",
670 .data = &modprobe_path,
671 .maxlen = KMOD_PATH_LEN,
672 .mode = 0644,
6d456111 673 .proc_handler = proc_dostring,
1da177e4 674 },
3d43321b 675 {
3d43321b
KC		 676 .procname = "modules_disabled",
677 .data = &modules_disabled,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 /* only handle a transition from default "0" to "1" */
6d456111 681 .proc_handler = proc_dointvec_minmax,
3d43321b
KC		 682 .extra1 = &one,
683 .extra2 = &one,
684 },
1da177e4 685#endif
86d56134 686#ifdef CONFIG_UEVENT_HELPER
1da177e4 687 {
1da177e4 688 .procname = "hotplug",
312c004d
KS		 689 .data = &uevent_helper,
690 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 691 .mode = 0644,
6d456111 692 .proc_handler = proc_dostring,
1da177e4 693 },
86d56134 694#endif
1da177e4
LT		 695#ifdef CONFIG_CHR_DEV_SG
696 {
1da177e4
LT		 697 .procname = "sg-big-buff",
698 .data = &sg_big_buff,
699 .maxlen = sizeof (int),
700 .mode = 0444,
6d456111 701 .proc_handler = proc_dointvec,
1da177e4
LT		 702 },
703#endif
704#ifdef CONFIG_BSD_PROCESS_ACCT
705 {
1da177e4
LT		 706 .procname = "acct",
707 .data = &acct_parm,
708 .maxlen = 3*sizeof(int),
709 .mode = 0644,
6d456111 710 .proc_handler = proc_dointvec,
1da177e4
LT		 711 },
712#endif
1da177e4
LT		 713#ifdef CONFIG_MAGIC_SYSRQ
714 {
1da177e4 715 .procname = "sysrq",
5d6f647f 716 .data = &__sysrq_enabled,
1da177e4
LT		 717 .maxlen = sizeof (int),
718 .mode = 0644,
97f5f0cd 719 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 720 },
721#endif
d6f8ff73 722#ifdef CONFIG_PROC_SYSCTL
1da177e4 723 {
1da177e4 724 .procname = "cad_pid",
9ec52099 725 .data = NULL,
1da177e4
LT		 726 .maxlen = sizeof (int),
727 .mode = 0600,
6d456111 728 .proc_handler = proc_do_cad_pid,
1da177e4 729 },
d6f8ff73 730#endif
1da177e4 731 {
1da177e4 732 .procname = "threads-max",
16db3d3f 733 .data = NULL,
1da177e4
LT		 734 .maxlen = sizeof(int),
735 .mode = 0644,
16db3d3f 736 .proc_handler = sysctl_max_threads,
1da177e4
LT		 737 },
738 {
1da177e4
LT		 739 .procname = "random",
740 .mode = 0555,
741 .child = random_table,
742 },
17f60a7d
EP		 743 {
744 .procname = "usermodehelper",
745 .mode = 0555,
746 .child = usermodehelper_table,
747 },
1da177e4 748 {
1da177e4
LT		 749 .procname = "overflowuid",
750 .data = &overflowuid,
751 .maxlen = sizeof(int),
752 .mode = 0644,
6d456111 753 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 754 .extra1 = &minolduid,
755 .extra2 = &maxolduid,
756 },
757 {
1da177e4
LT		 758 .procname = "overflowgid",
759 .data = &overflowgid,
760 .maxlen = sizeof(int),
761 .mode = 0644,
6d456111 762 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 763 .extra1 = &minolduid,
764 .extra2 = &maxolduid,
765 },
347a8dc3 766#ifdef CONFIG_S390
1da177e4
LT		 767#ifdef CONFIG_MATHEMU
768 {
1da177e4
LT		 769 .procname = "ieee_emulation_warnings",
770 .data = &sysctl_ieee_emulation_warnings,
771 .maxlen = sizeof(int),
772 .mode = 0644,
6d456111 773 .proc_handler = proc_dointvec,
1da177e4 774 },
1da177e4
LT		 775#endif
776 {
1da177e4 777 .procname = "userprocess_debug",
ab3c68ee 778 .data = &show_unhandled_signals,
1da177e4
LT		 779 .maxlen = sizeof(int),
780 .mode = 0644,
6d456111 781 .proc_handler = proc_dointvec,
1da177e4
LT		 782 },
783#endif
784 {
1da177e4
LT		 785 .procname = "pid_max",
786 .data = &pid_max,
787 .maxlen = sizeof (int),
788 .mode = 0644,
6d456111 789 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 790 .extra1 = &pid_max_min,
791 .extra2 = &pid_max_max,
792 },
793 {
1da177e4
LT		 794 .procname = "panic_on_oops",
795 .data = &panic_on_oops,
796 .maxlen = sizeof(int),
797 .mode = 0644,
6d456111 798 .proc_handler = proc_dointvec,
1da177e4 799 },
7ef3d2fd
JP		 800#if defined CONFIG_PRINTK
801 {
7ef3d2fd
JP		 802 .procname = "printk",
803 .data = &console_loglevel,
804 .maxlen = 4*sizeof(int),
805 .mode = 0644,
6d456111 806 .proc_handler = proc_dointvec,
7ef3d2fd 807 },
1da177e4 808 {
1da177e4 809 .procname = "printk_ratelimit",
717115e1 810 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 811 .maxlen = sizeof(int),
812 .mode = 0644,
6d456111 813 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 814 },
815 {
1da177e4 816 .procname = "printk_ratelimit_burst",
717115e1 817 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 818 .maxlen = sizeof(int),
819 .mode = 0644,
6d456111 820 .proc_handler = proc_dointvec,
1da177e4 821 },
af91322e 822 {
af91322e
DY		 823 .procname = "printk_delay",
824 .data = &printk_delay_msec,
825 .maxlen = sizeof(int),
826 .mode = 0644,
6d456111 827 .proc_handler = proc_dointvec_minmax,
af91322e
DY		 828 .extra1 = &zero,
829 .extra2 = &ten_thousand,
830 },
750afe7b
BP		 831 {
832 .procname = "printk_devkmsg",
833 .data = devkmsg_log_str,
834 .maxlen = DEVKMSG_STR_MAX_SIZE,
835 .mode = 0644,
836 .proc_handler = devkmsg_sysctl_set_loglvl,
837 },
eaf06b24
DR		 838 {
839 .procname = "dmesg_restrict",
840 .data = &dmesg_restrict,
841 .maxlen = sizeof(int),
842 .mode = 0644,
620f6e8e 843 .proc_handler = proc_dointvec_minmax_sysadmin,
eaf06b24
DR		 844 .extra1 = &zero,
845 .extra2 = &one,
846 },
455cd5ab
DR		 847 {
848 .procname = "kptr_restrict",
849 .data = &kptr_restrict,
850 .maxlen = sizeof(int),
851 .mode = 0644,
620f6e8e 852 .proc_handler = proc_dointvec_minmax_sysadmin,
455cd5ab
DR		 853 .extra1 = &zero,
854 .extra2 = &two,
855 },
df6e61d4 856#endif
1da177e4 857 {
1da177e4
LT		 858 .procname = "ngroups_max",
859 .data = &ngroups_max,
860 .maxlen = sizeof (int),
861 .mode = 0444,
6d456111 862 .proc_handler = proc_dointvec,
1da177e4 863 },
73efc039
DB		 864 {
865 .procname = "cap_last_cap",
866 .data = (void *)&cap_last_cap,
867 .maxlen = sizeof(int),
868 .mode = 0444,
869 .proc_handler = proc_dointvec,
870 },
58687acb 871#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 872 {
58687acb 873 .procname = "watchdog",
3c00ea82 874 .data = &watchdog_user_enabled,
504d7cf1
DZ		 875 .maxlen = sizeof (int),
876 .mode = 0644,
195daf66 877 .proc_handler = proc_watchdog,
586692a5
MSB		 878 .extra1 = &zero,
879 .extra2 = &one,
58687acb
DZ		 880 },
881 {
882 .procname = "watchdog_thresh",
586692a5 883 .data = &watchdog_thresh,
58687acb
DZ		 884 .maxlen = sizeof(int),
885 .mode = 0644,
195daf66 886 .proc_handler = proc_watchdog_thresh,
a6572f84 887 .extra1 = &zero,
58687acb 888 .extra2 = &sixty,
504d7cf1 889 },
195daf66
UO		 890 {
891 .procname = "nmi_watchdog",
892 .data = &nmi_watchdog_enabled,
893 .maxlen = sizeof (int),
894 .mode = 0644,
895 .proc_handler = proc_nmi_watchdog,
896 .extra1 = &zero,
897#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
898 .extra2 = &one,
899#else
900 .extra2 = &zero,
901#endif
902 },
05a4a952
NP		 903 {
904 .procname = "watchdog_cpumask",
905 .data = &watchdog_cpumask_bits,
906 .maxlen = NR_CPUS,
907 .mode = 0644,
908 .proc_handler = proc_watchdog_cpumask,
909 },
910#ifdef CONFIG_SOFTLOCKUP_DETECTOR
195daf66
UO		 911 {
912 .procname = "soft_watchdog",
913 .data = &soft_watchdog_enabled,
914 .maxlen = sizeof (int),
915 .mode = 0644,
916 .proc_handler = proc_soft_watchdog,
917 .extra1 = &zero,
918 .extra2 = &one,
919 },
2508ce18
DZ		 920 {
921 .procname = "softlockup_panic",
922 .data = &softlockup_panic,
923 .maxlen = sizeof(int),
924 .mode = 0644,
925 .proc_handler = proc_dointvec_minmax,
926 .extra1 = &zero,
927 .extra2 = &one,
928 },
05a4a952 929#ifdef CONFIG_SMP
ac1f5912 930 {
05a4a952
NP		 931 .procname = "softlockup_all_cpu_backtrace",
932 .data = &sysctl_softlockup_all_cpu_backtrace,
ac1f5912
DZ		 933 .maxlen = sizeof(int),
934 .mode = 0644,
935 .proc_handler = proc_dointvec_minmax,
936 .extra1 = &zero,
937 .extra2 = &one,
938 },
05a4a952 939#endif /* CONFIG_SMP */
ac1f5912 940#endif
05a4a952 941#ifdef CONFIG_HARDLOCKUP_DETECTOR
ed235875 942 {
05a4a952
NP		 943 .procname = "hardlockup_panic",
944 .data = &hardlockup_panic,
ed235875
AT		 945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec_minmax,
948 .extra1 = &zero,
949 .extra2 = &one,
950 },
05a4a952 951#ifdef CONFIG_SMP
55537871
JK		 952 {
953 .procname = "hardlockup_all_cpu_backtrace",
954 .data = &sysctl_hardlockup_all_cpu_backtrace,
955 .maxlen = sizeof(int),
956 .mode = 0644,
957 .proc_handler = proc_dointvec_minmax,
958 .extra1 = &zero,
959 .extra2 = &one,
960 },
ed235875 961#endif /* CONFIG_SMP */
5dc30558 962#endif
05a4a952
NP		 963#endif
964
5dc30558
DZ		 965#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
966 {
967 .procname = "unknown_nmi_panic",
968 .data = &unknown_nmi_panic,
969 .maxlen = sizeof (int),
970 .mode = 0644,
971 .proc_handler = proc_dointvec,
972 },
504d7cf1 973#endif
1da177e4 974#if defined(CONFIG_X86)
8da5adda 975 {
8da5adda
DZ		 976 .procname = "panic_on_unrecovered_nmi",
977 .data = &panic_on_unrecovered_nmi,
978 .maxlen = sizeof(int),
979 .mode = 0644,
6d456111 980 .proc_handler = proc_dointvec,
8da5adda 981 },
5211a242 982 {
5211a242
KG		 983 .procname = "panic_on_io_nmi",
984 .data = &panic_on_io_nmi,
985 .maxlen = sizeof(int),
986 .mode = 0644,
6d456111 987 .proc_handler = proc_dointvec,
5211a242 988 },
55af7796
MH		 989#ifdef CONFIG_DEBUG_STACKOVERFLOW
990 {
991 .procname = "panic_on_stackoverflow",
992 .data = &sysctl_panic_on_stackoverflow,
993 .maxlen = sizeof(int),
994 .mode = 0644,
995 .proc_handler = proc_dointvec,
996 },
997#endif
1da177e4 998 {
1da177e4
LT		 999 .procname = "bootloader_type",
1000 .data = &bootloader_type,
1001 .maxlen = sizeof (int),
1002 .mode = 0444,
6d456111 1003 .proc_handler = proc_dointvec,
1da177e4 1004 },
5031296c 1005 {
5031296c
PA		 1006 .procname = "bootloader_version",
1007 .data = &bootloader_version,
1008 .maxlen = sizeof (int),
1009 .mode = 0444,
6d456111 1010 .proc_handler = proc_dointvec,
5031296c 1011 },
6e7c4025 1012 {
6e7c4025
IM		 1013 .procname = "io_delay_type",
1014 .data = &io_delay_type,
1015 .maxlen = sizeof(int),
1016 .mode = 0644,
6d456111 1017 .proc_handler = proc_dointvec,
6e7c4025 1018 },
1da177e4 1019#endif
7a9166e3 1020#if defined(CONFIG_MMU)
1da177e4 1021 {
1da177e4
LT		 1022 .procname = "randomize_va_space",
1023 .data = &randomize_va_space,
1024 .maxlen = sizeof(int),
1025 .mode = 0644,
6d456111 1026 .proc_handler = proc_dointvec,
1da177e4 1027 },
7a9166e3 1028#endif
0152fb37 1029#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 1030 {
951f22d5
MS		 1031 .procname = "spin_retry",
1032 .data = &spin_retry,
1033 .maxlen = sizeof (int),
1034 .mode = 0644,
6d456111 1035 .proc_handler = proc_dointvec,
951f22d5 1036 },
c255d844 1037#endif
673d5b43 1038#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 1039 {
c255d844 1040 .procname = "acpi_video_flags",
77afcf78 1041 .data = &acpi_realmode_flags,
c255d844
PM		 1042 .maxlen = sizeof (unsigned long),
1043 .mode = 0644,
6d456111 1044 .proc_handler = proc_doulongvec_minmax,
c255d844 1045 },
d2b176ed 1046#endif
b6fca725 1047#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
d2b176ed 1048 {
d2b176ed
JS		 1049 .procname = "ignore-unaligned-usertrap",
1050 .data = &no_unaligned_warning,
1051 .maxlen = sizeof (int),
1052 .mode = 0644,
6d456111 1053 .proc_handler = proc_dointvec,
d2b176ed 1054 },
b6fca725
VG		 1055#endif
1056#ifdef CONFIG_IA64
88fc241f 1057 {
88fc241f
DC		 1058 .procname = "unaligned-dump-stack",
1059 .data = &unaligned_dump_stack,
1060 .maxlen = sizeof (int),
1061 .mode = 0644,
6d456111 1062 .proc_handler = proc_dointvec,
88fc241f 1063 },
bebfa101 1064#endif
e162b39a
MSB		 1065#ifdef CONFIG_DETECT_HUNG_TASK
1066 {
e162b39a
MSB		 1067 .procname = "hung_task_panic",
1068 .data = &sysctl_hung_task_panic,
1069 .maxlen = sizeof(int),
1070 .mode = 0644,
6d456111 1071 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 1072 .extra1 = &zero,
1073 .extra2 = &one,
1074 },
82a1fcb9 1075 {
82a1fcb9
IM		 1076 .procname = "hung_task_check_count",
1077 .data = &sysctl_hung_task_check_count,
cd64647f 1078 .maxlen = sizeof(int),
82a1fcb9 1079 .mode = 0644,
cd64647f
LZ		 1080 .proc_handler = proc_dointvec_minmax,
1081 .extra1 = &zero,
82a1fcb9
IM		 1082 },
1083 {
82a1fcb9
IM		 1084 .procname = "hung_task_timeout_secs",
1085 .data = &sysctl_hung_task_timeout_secs,
90739081 1086 .maxlen = sizeof(unsigned long),
82a1fcb9 1087 .mode = 0644,
6d456111 1088 .proc_handler = proc_dohung_task_timeout_secs,
80df2847 1089 .extra2 = &hung_task_timeout_max,
82a1fcb9
IM		 1090 },
1091 {
82a1fcb9
IM		 1092 .procname = "hung_task_warnings",
1093 .data = &sysctl_hung_task_warnings,
270750db 1094 .maxlen = sizeof(int),
82a1fcb9 1095 .mode = 0644,
270750db
AT		 1096 .proc_handler = proc_dointvec_minmax,
1097 .extra1 = &neg_one,
82a1fcb9 1098 },
c4f3b63f 1099#endif
23f78d4a
IM		 1100#ifdef CONFIG_RT_MUTEXES
1101 {
23f78d4a
IM		 1102 .procname = "max_lock_depth",
1103 .data = &max_lock_depth,
1104 .maxlen = sizeof(int),
1105 .mode = 0644,
6d456111 1106 .proc_handler = proc_dointvec,
23f78d4a 1107 },
5096add8 1108#endif
10a0a8d4 1109 {
10a0a8d4
JF		 1110 .procname = "poweroff_cmd",
1111 .data = &poweroff_cmd,
1112 .maxlen = POWEROFF_CMD_PATH_LEN,
1113 .mode = 0644,
6d456111 1114 .proc_handler = proc_dostring,
10a0a8d4 1115 },
0b77f5bf
DH		 1116#ifdef CONFIG_KEYS
1117 {
0b77f5bf
DH		 1118 .procname = "keys",
1119 .mode = 0555,
1120 .child = key_sysctls,
1121 },
1122#endif
cdd6c482 1123#ifdef CONFIG_PERF_EVENTS
aa4a2218
VW		 1124 /*
1125 * User-space scripts rely on the existence of this file
1126 * as a feature check for perf_events being enabled.
1127 *
1128 * So it's an ABI, do not remove!
1129 */
1ccd1549 1130 {
cdd6c482
IM		 1131 .procname = "perf_event_paranoid",
1132 .data = &sysctl_perf_event_paranoid,
1133 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 1134 .mode = 0644,
6d456111 1135 .proc_handler = proc_dointvec,
1ccd1549 1136 },
c5078f78 1137 {
cdd6c482
IM		 1138 .procname = "perf_event_mlock_kb",
1139 .data = &sysctl_perf_event_mlock,
1140 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 1141 .mode = 0644,
6d456111 1142 .proc_handler = proc_dointvec,
c5078f78 1143 },
a78ac325 1144 {
cdd6c482
IM		 1145 .procname = "perf_event_max_sample_rate",
1146 .data = &sysctl_perf_event_sample_rate,
1147 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 1148 .mode = 0644,
163ec435 1149 .proc_handler = perf_proc_update_handler,
723478c8 1150 .extra1 = &one,
a78ac325 1151 },
14c63f17
DH		 1152 {
1153 .procname = "perf_cpu_time_max_percent",
1154 .data = &sysctl_perf_cpu_time_max_percent,
1155 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1156 .mode = 0644,
1157 .proc_handler = perf_cpu_time_max_percent_handler,
1158 .extra1 = &zero,
1159 .extra2 = &one_hundred,
1160 },
c5dfd78e
ACM		 1161 {
1162 .procname = "perf_event_max_stack",
a831100a 1163 .data = &sysctl_perf_event_max_stack,
c5dfd78e
ACM		 1164 .maxlen = sizeof(sysctl_perf_event_max_stack),
1165 .mode = 0644,
1166 .proc_handler = perf_event_max_stack_handler,
1167 .extra1 = &zero,
1168 .extra2 = &six_hundred_forty_kb,
1169 },
c85b0334
ACM		 1170 {
1171 .procname = "perf_event_max_contexts_per_stack",
1172 .data = &sysctl_perf_event_max_contexts_per_stack,
1173 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1174 .mode = 0644,
1175 .proc_handler = perf_event_max_stack_handler,
1176 .extra1 = &zero,
1177 .extra2 = &one_thousand,
1178 },
1ccd1549 1179#endif
dfec072e
VN		 1180#ifdef CONFIG_KMEMCHECK
1181 {
dfec072e
VN		 1182 .procname = "kmemcheck",
1183 .data = &kmemcheck_enabled,
1184 .maxlen = sizeof(int),
1185 .mode = 0644,
6d456111 1186 .proc_handler = proc_dointvec,
dfec072e 1187 },
cb684b5b 1188#endif
9e3961a0
PB		 1189 {
1190 .procname = "panic_on_warn",
1191 .data = &panic_on_warn,
1192 .maxlen = sizeof(int),
1193 .mode = 0644,
1194 .proc_handler = proc_dointvec_minmax,
1195 .extra1 = &zero,
1196 .extra2 = &one,
1197 },
bc7a34b8
TG		 1198#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1199 {
1200 .procname = "timer_migration",
1201 .data = &sysctl_timer_migration,
1202 .maxlen = sizeof(unsigned int),
1203 .mode = 0644,
1204 .proc_handler = timer_migration_handler,
b94bf594
MJ		 1205 .extra1 = &zero,
1206 .extra2 = &one,
bc7a34b8 1207 },
1be7f75d
AS		 1208#endif
1209#ifdef CONFIG_BPF_SYSCALL
1210 {
1211 .procname = "unprivileged_bpf_disabled",
1212 .data = &sysctl_unprivileged_bpf_disabled,
1213 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1214 .mode = 0644,
1215 /* only handle a transition from default "0" to "1" */
1216 .proc_handler = proc_dointvec_minmax,
1217 .extra1 = &one,
1218 .extra2 = &one,
1219 },
088e9d25
DBO		 1220#endif
1221#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1222 {
1223 .procname = "panic_on_rcu_stall",
1224 .data = &sysctl_panic_on_rcu_stall,
1225 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1226 .mode = 0644,
1227 .proc_handler = proc_dointvec_minmax,
1228 .extra1 = &zero,
1229 .extra2 = &one,
1230 },
bc7a34b8 1231#endif
6fce56ec 1232 { }
1da177e4
LT		 1233};
1234
d8217f07 1235static struct ctl_table vm_table[] = {
1da177e4 1236 {
1da177e4
LT		 1237 .procname = "overcommit_memory",
1238 .data = &sysctl_overcommit_memory,
1239 .maxlen = sizeof(sysctl_overcommit_memory),
1240 .mode = 0644,
cb16e95f
PH		 1241 .proc_handler = proc_dointvec_minmax,
1242 .extra1 = &zero,
1243 .extra2 = &two,
1da177e4 1244 },
fadd8fbd 1245 {
fadd8fbd
KH		 1246 .procname = "panic_on_oom",
1247 .data = &sysctl_panic_on_oom,
1248 .maxlen = sizeof(sysctl_panic_on_oom),
1249 .mode = 0644,
cb16e95f
PH		 1250 .proc_handler = proc_dointvec_minmax,
1251 .extra1 = &zero,
1252 .extra2 = &two,
fadd8fbd 1253 },
fe071d7e 1254 {
fe071d7e
DR		 1255 .procname = "oom_kill_allocating_task",
1256 .data = &sysctl_oom_kill_allocating_task,
1257 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1258 .mode = 0644,
6d456111 1259 .proc_handler = proc_dointvec,
fe071d7e 1260 },
fef1bdd6 1261 {
fef1bdd6
DR		 1262 .procname = "oom_dump_tasks",
1263 .data = &sysctl_oom_dump_tasks,
1264 .maxlen = sizeof(sysctl_oom_dump_tasks),
1265 .mode = 0644,
6d456111 1266 .proc_handler = proc_dointvec,
fef1bdd6 1267 },
1da177e4 1268 {
1da177e4
LT		 1269 .procname = "overcommit_ratio",
1270 .data = &sysctl_overcommit_ratio,
1271 .maxlen = sizeof(sysctl_overcommit_ratio),
1272 .mode = 0644,
49f0ce5f
JM		 1273 .proc_handler = overcommit_ratio_handler,
1274 },
1275 {
1276 .procname = "overcommit_kbytes",
1277 .data = &sysctl_overcommit_kbytes,
1278 .maxlen = sizeof(sysctl_overcommit_kbytes),
1279 .mode = 0644,
1280 .proc_handler = overcommit_kbytes_handler,
1da177e4
LT		 1281 },
1282 {
1da177e4
LT		 1283 .procname = "page-cluster",
1284 .data = &page_cluster,
1285 .maxlen = sizeof(int),
1286 .mode = 0644,
cb16e95f
PH		 1287 .proc_handler = proc_dointvec_minmax,
1288 .extra1 = &zero,
1da177e4
LT		 1289 },
1290 {
1da177e4
LT		 1291 .procname = "dirty_background_ratio",
1292 .data = &dirty_background_ratio,
1293 .maxlen = sizeof(dirty_background_ratio),
1294 .mode = 0644,
6d456111 1295 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1296 .extra1 = &zero,
1297 .extra2 = &one_hundred,
1298 },
2da02997 1299 {
2da02997
DR		 1300 .procname = "dirty_background_bytes",
1301 .data = &dirty_background_bytes,
1302 .maxlen = sizeof(dirty_background_bytes),
1303 .mode = 0644,
6d456111 1304 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1305 .extra1 = &one_ul,
2da02997 1306 },
1da177e4 1307 {
1da177e4
LT		 1308 .procname = "dirty_ratio",
1309 .data = &vm_dirty_ratio,
1310 .maxlen = sizeof(vm_dirty_ratio),
1311 .mode = 0644,
6d456111 1312 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1313 .extra1 = &zero,
1314 .extra2 = &one_hundred,
1315 },
2da02997 1316 {
2da02997
DR		 1317 .procname = "dirty_bytes",
1318 .data = &vm_dirty_bytes,
1319 .maxlen = sizeof(vm_dirty_bytes),
1320 .mode = 0644,
6d456111 1321 .proc_handler = dirty_bytes_handler,
9e4a5bda 1322 .extra1 = &dirty_bytes_min,
2da02997 1323 },
1da177e4 1324 {
1da177e4 1325 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1326 .data = &dirty_writeback_interval,
1327 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1328 .mode = 0644,
6d456111 1329 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1330 },
1331 {
1da177e4 1332 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1333 .data = &dirty_expire_interval,
1334 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1335 .mode = 0644,
cb16e95f
PH		 1336 .proc_handler = proc_dointvec_minmax,
1337 .extra1 = &zero,
1da177e4 1338 },
1efff914
TT		 1339 {
1340 .procname = "dirtytime_expire_seconds",
1341 .data = &dirtytime_expire_interval,
1342 .maxlen = sizeof(dirty_expire_interval),
1343 .mode = 0644,
1344 .proc_handler = dirtytime_interval_handler,
1345 .extra1 = &zero,
1346 },
1da177e4 1347 {
3965c9ae
WL		 1348 .procname = "nr_pdflush_threads",
1349 .mode = 0444 /* read-only */,
1350 .proc_handler = pdflush_proc_obsolete,
1da177e4
LT		 1351 },
1352 {
1da177e4
LT		 1353 .procname = "swappiness",
1354 .data = &vm_swappiness,
1355 .maxlen = sizeof(vm_swappiness),
1356 .mode = 0644,
6d456111 1357 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1358 .extra1 = &zero,
1359 .extra2 = &one_hundred,
1360 },
1361#ifdef CONFIG_HUGETLB_PAGE
06808b08 1362 {
1da177e4 1363 .procname = "nr_hugepages",
e5ff2159 1364 .data = NULL,
1da177e4
LT		 1365 .maxlen = sizeof(unsigned long),
1366 .mode = 0644,
6d456111 1367 .proc_handler = hugetlb_sysctl_handler,
06808b08
LS		 1368 },
1369#ifdef CONFIG_NUMA
1370 {
1371 .procname = "nr_hugepages_mempolicy",
1372 .data = NULL,
1373 .maxlen = sizeof(unsigned long),
1374 .mode = 0644,
1375 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
06808b08
LS		 1376 },
1377#endif
1da177e4 1378 {
1da177e4
LT		 1379 .procname = "hugetlb_shm_group",
1380 .data = &sysctl_hugetlb_shm_group,
1381 .maxlen = sizeof(gid_t),
1382 .mode = 0644,
6d456111 1383 .proc_handler = proc_dointvec,
1da177e4 1384 },
396faf03 1385 {
396faf03
MG		 1386 .procname = "hugepages_treat_as_movable",
1387 .data = &hugepages_treat_as_movable,
1388 .maxlen = sizeof(int),
1389 .mode = 0644,
86cdb465 1390 .proc_handler = proc_dointvec,
396faf03 1391 },
d1c3fb1f 1392 {
d1c3fb1f 1393 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1394 .data = NULL,
1395 .maxlen = sizeof(unsigned long),
d1c3fb1f 1396 .mode = 0644,
6d456111 1397 .proc_handler = hugetlb_overcommit_handler,
d1c3fb1f 1398 },
1da177e4
LT		 1399#endif
1400 {
1da177e4
LT		 1401 .procname = "lowmem_reserve_ratio",
1402 .data = &sysctl_lowmem_reserve_ratio,
1403 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1404 .mode = 0644,
6d456111 1405 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1406 },
9d0243bc 1407 {
9d0243bc
AM		 1408 .procname = "drop_caches",
1409 .data = &sysctl_drop_caches,
1410 .maxlen = sizeof(int),
1411 .mode = 0644,
1412 .proc_handler = drop_caches_sysctl_handler,
cb16e95f 1413 .extra1 = &one,
5509a5d2 1414 .extra2 = &four,
9d0243bc 1415 },
76ab0f53
MG		 1416#ifdef CONFIG_COMPACTION
1417 {
1418 .procname = "compact_memory",
1419 .data = &sysctl_compact_memory,
1420 .maxlen = sizeof(int),
1421 .mode = 0200,
1422 .proc_handler = sysctl_compaction_handler,
1423 },
5e771905
MG		 1424 {
1425 .procname = "extfrag_threshold",
1426 .data = &sysctl_extfrag_threshold,
1427 .maxlen = sizeof(int),
1428 .mode = 0644,
1429 .proc_handler = sysctl_extfrag_handler,
1430 .extra1 = &min_extfrag_threshold,
1431 .extra2 = &max_extfrag_threshold,
1432 },
5bbe3547
EM		 1433 {
1434 .procname = "compact_unevictable_allowed",
1435 .data = &sysctl_compact_unevictable_allowed,
1436 .maxlen = sizeof(int),
1437 .mode = 0644,
1438 .proc_handler = proc_dointvec,
1439 .extra1 = &zero,
1440 .extra2 = &one,
1441 },
5e771905 1442
76ab0f53 1443#endif /* CONFIG_COMPACTION */
1da177e4 1444 {
1da177e4
LT		 1445 .procname = "min_free_kbytes",
1446 .data = &min_free_kbytes,
1447 .maxlen = sizeof(min_free_kbytes),
1448 .mode = 0644,
6d456111 1449 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1450 .extra1 = &zero,
1451 },
795ae7a0
JW		 1452 {
1453 .procname = "watermark_scale_factor",
1454 .data = &watermark_scale_factor,
1455 .maxlen = sizeof(watermark_scale_factor),
1456 .mode = 0644,
1457 .proc_handler = watermark_scale_factor_sysctl_handler,
1458 .extra1 = &one,
1459 .extra2 = &one_thousand,
1460 },
8ad4b1fb 1461 {
8ad4b1fb
RS		 1462 .procname = "percpu_pagelist_fraction",
1463 .data = &percpu_pagelist_fraction,
1464 .maxlen = sizeof(percpu_pagelist_fraction),
1465 .mode = 0644,
6d456111 1466 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
7cd2b0a3 1467 .extra1 = &zero,
8ad4b1fb 1468 },
1da177e4
LT		 1469#ifdef CONFIG_MMU
1470 {
1da177e4
LT		 1471 .procname = "max_map_count",
1472 .data = &sysctl_max_map_count,
1473 .maxlen = sizeof(sysctl_max_map_count),
1474 .mode = 0644,
3e26120c 1475 .proc_handler = proc_dointvec_minmax,
70da2340 1476 .extra1 = &zero,
1da177e4 1477 },
dd8632a1
PM		 1478#else
1479 {
dd8632a1
PM		 1480 .procname = "nr_trim_pages",
1481 .data = &sysctl_nr_trim_pages,
1482 .maxlen = sizeof(sysctl_nr_trim_pages),
1483 .mode = 0644,
6d456111 1484 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1485 .extra1 = &zero,
1486 },
1da177e4
LT		 1487#endif
1488 {
1da177e4
LT		 1489 .procname = "laptop_mode",
1490 .data = &laptop_mode,
1491 .maxlen = sizeof(laptop_mode),
1492 .mode = 0644,
6d456111 1493 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1494 },
1495 {
1da177e4
LT		 1496 .procname = "block_dump",
1497 .data = &block_dump,
1498 .maxlen = sizeof(block_dump),
1499 .mode = 0644,
6d456111 1500 .proc_handler = proc_dointvec,
1da177e4
LT		 1501 .extra1 = &zero,
1502 },
1503 {
1da177e4
LT		 1504 .procname = "vfs_cache_pressure",
1505 .data = &sysctl_vfs_cache_pressure,
1506 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1507 .mode = 0644,
6d456111 1508 .proc_handler = proc_dointvec,
1da177e4
LT		 1509 .extra1 = &zero,
1510 },
1511#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1512 {
1da177e4
LT		 1513 .procname = "legacy_va_layout",
1514 .data = &sysctl_legacy_va_layout,
1515 .maxlen = sizeof(sysctl_legacy_va_layout),
1516 .mode = 0644,
6d456111 1517 .proc_handler = proc_dointvec,
1da177e4
LT		 1518 .extra1 = &zero,
1519 },
1520#endif
1743660b
CL		 1521#ifdef CONFIG_NUMA
1522 {
1743660b 1523 .procname = "zone_reclaim_mode",
a5f5f91d
MG		 1524 .data = &node_reclaim_mode,
1525 .maxlen = sizeof(node_reclaim_mode),
1743660b 1526 .mode = 0644,
6d456111 1527 .proc_handler = proc_dointvec,
c84db23c 1528 .extra1 = &zero,
1743660b 1529 },
9614634f 1530 {
9614634f
CL		 1531 .procname = "min_unmapped_ratio",
1532 .data = &sysctl_min_unmapped_ratio,
1533 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1534 .mode = 0644,
6d456111 1535 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1536 .extra1 = &zero,
1537 .extra2 = &one_hundred,
1538 },
0ff38490 1539 {
0ff38490
CL		 1540 .procname = "min_slab_ratio",
1541 .data = &sysctl_min_slab_ratio,
1542 .maxlen = sizeof(sysctl_min_slab_ratio),
1543 .mode = 0644,
6d456111 1544 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1545 .extra1 = &zero,
1546 .extra2 = &one_hundred,
1547 },
e6e5494c 1548#endif
77461ab3
CL		 1549#ifdef CONFIG_SMP
1550 {
77461ab3
CL		 1551 .procname = "stat_interval",
1552 .data = &sysctl_stat_interval,
1553 .maxlen = sizeof(sysctl_stat_interval),
1554 .mode = 0644,
6d456111 1555 .proc_handler = proc_dointvec_jiffies,
77461ab3 1556 },
52b6f46b
HD		 1557 {
1558 .procname = "stat_refresh",
1559 .data = NULL,
1560 .maxlen = 0,
1561 .mode = 0600,
1562 .proc_handler = vmstat_refresh,
1563 },
77461ab3 1564#endif
6e141546 1565#ifdef CONFIG_MMU
ed032189 1566 {
ed032189 1567 .procname = "mmap_min_addr",
788084ab
EP		 1568 .data = &dac_mmap_min_addr,
1569 .maxlen = sizeof(unsigned long),
ed032189 1570 .mode = 0644,
6d456111 1571 .proc_handler = mmap_min_addr_handler,
ed032189 1572 },
6e141546 1573#endif
f0c0b2b8
KH		 1574#ifdef CONFIG_NUMA
1575 {
f0c0b2b8
KH		 1576 .procname = "numa_zonelist_order",
1577 .data = &numa_zonelist_order,
1578 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1579 .mode = 0644,
6d456111 1580 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1581 },
1582#endif
2b8232ce 1583#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1584 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1585 {
e6e5494c 1586 .procname = "vdso_enabled",
3d7ee969
AL		 1587#ifdef CONFIG_X86_32
1588 .data = &vdso32_enabled,
1589 .maxlen = sizeof(vdso32_enabled),
1590#else
e6e5494c
IM		 1591 .data = &vdso_enabled,
1592 .maxlen = sizeof(vdso_enabled),
3d7ee969 1593#endif
e6e5494c 1594 .mode = 0644,
6d456111 1595 .proc_handler = proc_dointvec,
e6e5494c
IM		 1596 .extra1 = &zero,
1597 },
1da177e4 1598#endif
195cf453
BG		 1599#ifdef CONFIG_HIGHMEM
1600 {
195cf453
BG		 1601 .procname = "highmem_is_dirtyable",
1602 .data = &vm_highmem_is_dirtyable,
1603 .maxlen = sizeof(vm_highmem_is_dirtyable),
1604 .mode = 0644,
6d456111 1605 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1606 .extra1 = &zero,
1607 .extra2 = &one,
1608 },
1609#endif
6a46079c
AK		 1610#ifdef CONFIG_MEMORY_FAILURE
1611 {
6a46079c
AK		 1612 .procname = "memory_failure_early_kill",
1613 .data = &sysctl_memory_failure_early_kill,
1614 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1615 .mode = 0644,
6d456111 1616 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1617 .extra1 = &zero,
1618 .extra2 = &one,
1619 },
1620 {
6a46079c
AK		 1621 .procname = "memory_failure_recovery",
1622 .data = &sysctl_memory_failure_recovery,
1623 .maxlen = sizeof(sysctl_memory_failure_recovery),
1624 .mode = 0644,
6d456111 1625 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1626 .extra1 = &zero,
1627 .extra2 = &one,
1628 },
1629#endif
c9b1d098
AS		 1630 {
1631 .procname = "user_reserve_kbytes",
1632 .data = &sysctl_user_reserve_kbytes,
1633 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1634 .mode = 0644,
1635 .proc_handler = proc_doulongvec_minmax,
1636 },
4eeab4f5
AS		 1637 {
1638 .procname = "admin_reserve_kbytes",
1639 .data = &sysctl_admin_reserve_kbytes,
1640 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1641 .mode = 0644,
1642 .proc_handler = proc_doulongvec_minmax,
1643 },
d07e2259
DC		 1644#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1645 {
1646 .procname = "mmap_rnd_bits",
1647 .data = &mmap_rnd_bits,
1648 .maxlen = sizeof(mmap_rnd_bits),
1649 .mode = 0600,
1650 .proc_handler = proc_dointvec_minmax,
1651 .extra1 = (void *)&mmap_rnd_bits_min,
1652 .extra2 = (void *)&mmap_rnd_bits_max,
1653 },
1654#endif
1655#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1656 {
1657 .procname = "mmap_rnd_compat_bits",
1658 .data = &mmap_rnd_compat_bits,
1659 .maxlen = sizeof(mmap_rnd_compat_bits),
1660 .mode = 0600,
1661 .proc_handler = proc_dointvec_minmax,
1662 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1663 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1664 },
1665#endif
6fce56ec 1666 { }
1da177e4
LT		 1667};
1668
d8217f07 1669static struct ctl_table fs_table[] = {
1da177e4 1670 {
1da177e4
LT		 1671 .procname = "inode-nr",
1672 .data = &inodes_stat,
3942c07c 1673 .maxlen = 2*sizeof(long),
1da177e4 1674 .mode = 0444,
cffbc8aa 1675 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1676 },
1677 {
1da177e4
LT		 1678 .procname = "inode-state",
1679 .data = &inodes_stat,
3942c07c 1680 .maxlen = 7*sizeof(long),
1da177e4 1681 .mode = 0444,
cffbc8aa 1682 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1683 },
1684 {
1da177e4
LT		 1685 .procname = "file-nr",
1686 .data = &files_stat,
518de9b3 1687 .maxlen = sizeof(files_stat),
1da177e4 1688 .mode = 0444,
6d456111 1689 .proc_handler = proc_nr_files,
1da177e4
LT		 1690 },
1691 {
1da177e4
LT		 1692 .procname = "file-max",
1693 .data = &files_stat.max_files,
518de9b3 1694 .maxlen = sizeof(files_stat.max_files),
1da177e4 1695 .mode = 0644,
518de9b3 1696 .proc_handler = proc_doulongvec_minmax,
1da177e4 1697 },
9cfe015a 1698 {
9cfe015a
ED		 1699 .procname = "nr_open",
1700 .data = &sysctl_nr_open,
9b80a184 1701 .maxlen = sizeof(unsigned int),
9cfe015a 1702 .mode = 0644,
6d456111 1703 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1704 .extra1 = &sysctl_nr_open_min,
1705 .extra2 = &sysctl_nr_open_max,
9cfe015a 1706 },
1da177e4 1707 {
1da177e4
LT		 1708 .procname = "dentry-state",
1709 .data = &dentry_stat,
3942c07c 1710 .maxlen = 6*sizeof(long),
1da177e4 1711 .mode = 0444,
312d3ca8 1712 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1713 },
1714 {
1da177e4
LT		 1715 .procname = "overflowuid",
1716 .data = &fs_overflowuid,
1717 .maxlen = sizeof(int),
1718 .mode = 0644,
6d456111 1719 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1720 .extra1 = &minolduid,
1721 .extra2 = &maxolduid,
1722 },
1723 {
1da177e4
LT		 1724 .procname = "overflowgid",
1725 .data = &fs_overflowgid,
1726 .maxlen = sizeof(int),
1727 .mode = 0644,
6d456111 1728 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1729 .extra1 = &minolduid,
1730 .extra2 = &maxolduid,
1731 },
bfcd17a6 1732#ifdef CONFIG_FILE_LOCKING
1da177e4 1733 {
1da177e4
LT		 1734 .procname = "leases-enable",
1735 .data = &leases_enable,
1736 .maxlen = sizeof(int),
1737 .mode = 0644,
6d456111 1738 .proc_handler = proc_dointvec,
1da177e4 1739 },
bfcd17a6 1740#endif
1da177e4
LT		 1741#ifdef CONFIG_DNOTIFY
1742 {
1da177e4
LT		 1743 .procname = "dir-notify-enable",
1744 .data = &dir_notify_enable,
1745 .maxlen = sizeof(int),
1746 .mode = 0644,
6d456111 1747 .proc_handler = proc_dointvec,
1da177e4
LT		 1748 },
1749#endif
1750#ifdef CONFIG_MMU
bfcd17a6 1751#ifdef CONFIG_FILE_LOCKING
1da177e4 1752 {
1da177e4
LT		 1753 .procname = "lease-break-time",
1754 .data = &lease_break_time,
1755 .maxlen = sizeof(int),
1756 .mode = 0644,
6d456111 1757 .proc_handler = proc_dointvec,
1da177e4 1758 },
bfcd17a6 1759#endif
ebf3f09c 1760#ifdef CONFIG_AIO
1da177e4 1761 {
1da177e4
LT		 1762 .procname = "aio-nr",
1763 .data = &aio_nr,
1764 .maxlen = sizeof(aio_nr),
1765 .mode = 0444,
6d456111 1766 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1767 },
1768 {
1da177e4
LT		 1769 .procname = "aio-max-nr",
1770 .data = &aio_max_nr,
1771 .maxlen = sizeof(aio_max_nr),
1772 .mode = 0644,
6d456111 1773 .proc_handler = proc_doulongvec_minmax,
1da177e4 1774 },
ebf3f09c 1775#endif /* CONFIG_AIO */
2d9048e2 1776#ifdef CONFIG_INOTIFY_USER
0399cb08 1777 {
0399cb08
RL		 1778 .procname = "inotify",
1779 .mode = 0555,
1780 .child = inotify_table,
1781 },
1782#endif
7ef9964e
DL		 1783#ifdef CONFIG_EPOLL
1784 {
1785 .procname = "epoll",
1786 .mode = 0555,
1787 .child = epoll_table,
1788 },
1789#endif
1da177e4 1790#endif
800179c9
KC		 1791 {
1792 .procname = "protected_symlinks",
1793 .data = &sysctl_protected_symlinks,
1794 .maxlen = sizeof(int),
1795 .mode = 0600,
1796 .proc_handler = proc_dointvec_minmax,
1797 .extra1 = &zero,
1798 .extra2 = &one,
1799 },
1800 {
1801 .procname = "protected_hardlinks",
1802 .data = &sysctl_protected_hardlinks,
1803 .maxlen = sizeof(int),
1804 .mode = 0600,
1805 .proc_handler = proc_dointvec_minmax,
1806 .extra1 = &zero,
1807 .extra2 = &one,
1808 },
d6e71144 1809 {
d6e71144
AC		 1810 .procname = "suid_dumpable",
1811 .data = &suid_dumpable,
1812 .maxlen = sizeof(int),
1813 .mode = 0644,
54b50199 1814 .proc_handler = proc_dointvec_minmax_coredump,
8e654fba
MW		 1815 .extra1 = &zero,
1816 .extra2 = &two,
d6e71144 1817 },
2abc26fc
EB		 1818#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1819 {
2abc26fc
EB		 1820 .procname = "binfmt_misc",
1821 .mode = 0555,
f9bd6733 1822 .child = sysctl_mount_point,
2abc26fc
EB		 1823 },
1824#endif
b492e95b 1825 {
ff9da691
JA		 1826 .procname = "pipe-max-size",
1827 .data = &pipe_max_size,
b492e95b
JA		 1828 .maxlen = sizeof(int),
1829 .mode = 0644,
ff9da691
JA		 1830 .proc_handler = &pipe_proc_fn,
1831 .extra1 = &pipe_min_size,
b492e95b 1832 },
759c0114
WT		 1833 {
1834 .procname = "pipe-user-pages-hard",
1835 .data = &pipe_user_pages_hard,
1836 .maxlen = sizeof(pipe_user_pages_hard),
1837 .mode = 0644,
1838 .proc_handler = proc_doulongvec_minmax,
1839 },
1840 {
1841 .procname = "pipe-user-pages-soft",
1842 .data = &pipe_user_pages_soft,
1843 .maxlen = sizeof(pipe_user_pages_soft),
1844 .mode = 0644,
1845 .proc_handler = proc_doulongvec_minmax,
1846 },
d2921684
EB		 1847 {
1848 .procname = "mount-max",
1849 .data = &sysctl_mount_max,
1850 .maxlen = sizeof(unsigned int),
1851 .mode = 0644,
1852 .proc_handler = proc_dointvec_minmax,
1853 .extra1 = &one,
1854 },
6fce56ec 1855 { }
1da177e4
LT		 1856};
1857
d8217f07 1858static struct ctl_table debug_table[] = {
7ac57a89 1859#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
abd4f750 1860 {
abd4f750
MAS		 1861 .procname = "exception-trace",
1862 .data = &show_unhandled_signals,
1863 .maxlen = sizeof(int),
1864 .mode = 0644,
1865 .proc_handler = proc_dointvec
1866 },
b2be84df
MH		 1867#endif
1868#if defined(CONFIG_OPTPROBES)
1869 {
1870 .procname = "kprobes-optimization",
1871 .data = &sysctl_kprobes_optimization,
1872 .maxlen = sizeof(int),
1873 .mode = 0644,
1874 .proc_handler = proc_kprobes_optimization_handler,
1875 .extra1 = &zero,
1876 .extra2 = &one,
1877 },
abd4f750 1878#endif
6fce56ec 1879 { }
1da177e4
LT		 1880};
1881
d8217f07 1882static struct ctl_table dev_table[] = {
6fce56ec 1883 { }
0eeca283 1884};
1da177e4 1885
de4e83bd 1886int __init sysctl_init(void)
d912b0cc 1887{
fd4b616b
SR		 1888 struct ctl_table_header *hdr;
1889
1890 hdr = register_sysctl_table(sysctl_base_table);
1891 kmemleak_not_leak(hdr);
d912b0cc
EB		 1892 return 0;
1893}
1894
b89a8171
EB		 1895#endif /* CONFIG_SYSCTL */
1896
1da177e4
LT		 1897/*
1898 * /proc/sys support
1899 */
1900
b89a8171 1901#ifdef CONFIG_PROC_SYSCTL
1da177e4 1902
f8808300
KC		 1903static int _proc_do_string(char *data, int maxlen, int write,
1904 char __user *buffer,
b1ba4ddd 1905 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1906{
1907 size_t len;
1908 char __user *p;
1909 char c;
8d060877
ON		 1910
1911 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1912 *lenp = 0;
1913 return 0;
1914 }
8d060877 1915
1da177e4 1916 if (write) {
f4aacea2
KC		 1917 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1918 /* Only continue writes not past the end of buffer. */
1919 len = strlen(data);
1920 if (len > maxlen - 1)
1921 len = maxlen - 1;
1922
1923 if (*ppos > len)
1924 return 0;
1925 len = *ppos;
1926 } else {
1927 /* Start writing from beginning of buffer. */
1928 len = 0;
1929 }
1930
2ca9bb45 1931 *ppos += *lenp;
1da177e4 1932 p = buffer;
2ca9bb45 1933 while ((p - buffer) < *lenp && len < maxlen - 1) {
1da177e4
LT		 1934 if (get_user(c, p++))
1935 return -EFAULT;
1936 if (c == 0 || c == '\n')
1937 break;
2ca9bb45 1938 data[len++] = c;
1da177e4 1939 }
f8808300 1940 data[len] = 0;
1da177e4 1941 } else {
f5dd3d6f
SV		 1942 len = strlen(data);
1943 if (len > maxlen)
1944 len = maxlen;
8d060877
ON		 1945
1946 if (*ppos > len) {
1947 *lenp = 0;
1948 return 0;
1949 }
1950
1951 data += *ppos;
1952 len -= *ppos;
1953
1da177e4
LT		 1954 if (len > *lenp)
1955 len = *lenp;
1956 if (len)
f8808300 1957 if (copy_to_user(buffer, data, len))
1da177e4
LT		 1958 return -EFAULT;
1959 if (len < *lenp) {
f8808300 1960 if (put_user('\n', buffer + len))
1da177e4
LT		 1961 return -EFAULT;
1962 len++;
1963 }
1964 *lenp = len;
1965 *ppos += len;
1966 }
1967 return 0;
1968}
1969
f4aacea2
KC		 1970static void warn_sysctl_write(struct ctl_table *table)
1971{
1972 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1973 "This will not be supported in the future. To silence this\n"
1974 "warning, set kernel.sysctl_writes_strict = -1\n",
1975 current->comm, table->procname);
1976}
1977
d383d484
LR		 1978/**
1979 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1980 * @ppos: file position
1981 * @table: the sysctl table
1982 *
1983 * Returns true if the first position is non-zero and the sysctl_writes_strict
1984 * mode indicates this is not allowed for numeric input types. String proc
1985 * hadlers can ignore the return value.
1986 */
1987static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1988 struct ctl_table *table)
1989{
1990 if (!*ppos)
1991 return false;
1992
1993 switch (sysctl_writes_strict) {
1994 case SYSCTL_WRITES_STRICT:
1995 return true;
1996 case SYSCTL_WRITES_WARN:
1997 warn_sysctl_write(table);
1998 return false;
1999 default:
2000 return false;
2001 }
2002}
2003
f5dd3d6f
SV		 2004/**
2005 * proc_dostring - read a string sysctl
2006 * @table: the sysctl table
2007 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 2008 * @buffer: the user buffer
2009 * @lenp: the size of the user buffer
2010 * @ppos: file position
2011 *
2012 * Reads/writes a string from/to the user buffer. If the kernel
2013 * buffer provided is not large enough to hold the string, the
2014 * string is truncated. The copied string is %NULL-terminated.
2015 * If the string is being read by the user process, it is copied
2016 * and a newline '\n' is added. It is truncated if the buffer is
2017 * not large enough.
2018 *
2019 * Returns 0 on success.
2020 */
8d65af78 2021int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 2022 void __user *buffer, size_t *lenp, loff_t *ppos)
2023{
d383d484
LR		 2024 if (write)
2025 proc_first_pos_non_zero_ignore(ppos, table);
f4aacea2 2026
f8808300
KC		 2027 return _proc_do_string((char *)(table->data), table->maxlen, write,
2028 (char __user *)buffer, lenp, ppos);
f5dd3d6f
SV		 2029}
2030
00b7c339
AW		 2031static size_t proc_skip_spaces(char **buf)
2032{
2033 size_t ret;
2034 char *tmp = skip_spaces(*buf);
2035 ret = tmp - *buf;
2036 *buf = tmp;
2037 return ret;
2038}
2039
9f977fb7
OP		 2040static void proc_skip_char(char **buf, size_t *size, const char v)
2041{
2042 while (*size) {
2043 if (**buf != v)
2044 break;
2045 (*size)--;
2046 (*buf)++;
2047 }
2048}
2049
00b7c339
AW		 2050#define TMPBUFLEN 22
2051/**
0fc377bd 2052 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2053 *
0fc377bd
RD		 2054 * @buf: a kernel buffer
2055 * @size: size of the kernel buffer
2056 * @val: this is where the number will be stored
2057 * @neg: set to %TRUE if number is negative
2058 * @perm_tr: a vector which contains the allowed trailers
2059 * @perm_tr_len: size of the perm_tr vector
2060 * @tr: pointer to store the trailer character
00b7c339 2061 *
0fc377bd
RD		 2062 * In case of success %0 is returned and @buf and @size are updated with
2063 * the amount of bytes read. If @tr is non-NULL and a trailing
2064 * character exists (size is non-zero after returning from this
2065 * function), @tr is updated with the trailing character.
00b7c339
AW		 2066 */
2067static int proc_get_long(char **buf, size_t *size,
2068 unsigned long *val, bool *neg,
2069 const char *perm_tr, unsigned perm_tr_len, char *tr)
2070{
2071 int len;
2072 char *p, tmp[TMPBUFLEN];
2073
2074 if (!*size)
2075 return -EINVAL;
2076
2077 len = *size;
2078 if (len > TMPBUFLEN - 1)
2079 len = TMPBUFLEN - 1;
2080
2081 memcpy(tmp, *buf, len);
2082
2083 tmp[len] = 0;
2084 p = tmp;
2085 if (*p == '-' && *size > 1) {
2086 *neg = true;
2087 p++;
2088 } else
2089 *neg = false;
2090 if (!isdigit(*p))
2091 return -EINVAL;
2092
2093 *val = simple_strtoul(p, &p, 0);
2094
2095 len = p - tmp;
2096
2097 /* We don't know if the next char is whitespace thus we may accept
2098 * invalid integers (e.g. 1234...a) or two integers instead of one
2099 * (e.g. 123...1). So lets not allow such large numbers. */
2100 if (len == TMPBUFLEN - 1)
2101 return -EINVAL;
2102
2103 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2104 return -EINVAL;
1da177e4 2105
00b7c339
AW		 2106 if (tr && (len < *size))
2107 *tr = *p;
2108
2109 *buf += len;
2110 *size -= len;
2111
2112 return 0;
2113}
2114
2115/**
0fc377bd 2116 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2117 *
0fc377bd
RD		 2118 * @buf: the user buffer
2119 * @size: the size of the user buffer
2120 * @val: the integer to be converted
2121 * @neg: sign of the number, %TRUE for negative
00b7c339 2122 *
0fc377bd
RD		 2123 * In case of success %0 is returned and @buf and @size are updated with
2124 * the amount of bytes written.
00b7c339
AW		 2125 */
2126static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2127 bool neg)
2128{
2129 int len;
2130 char tmp[TMPBUFLEN], *p = tmp;
2131
2132 sprintf(p, "%s%lu", neg ? "-" : "", val);
2133 len = strlen(tmp);
2134 if (len > *size)
2135 len = *size;
2136 if (copy_to_user(*buf, tmp, len))
2137 return -EFAULT;
2138 *size -= len;
2139 *buf += len;
2140 return 0;
2141}
2142#undef TMPBUFLEN
2143
2144static int proc_put_char(void __user **buf, size_t *size, char c)
2145{
2146 if (*size) {
2147 char __user **buffer = (char __user **)buf;
2148 if (put_user(c, *buffer))
2149 return -EFAULT;
2150 (*size)--, (*buffer)++;
2151 *buf = *buffer;
2152 }
2153 return 0;
2154}
1da177e4 2155
00b7c339 2156static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2157 int *valp,
2158 int write, void *data)
2159{
2160 if (write) {
230633d1
HS		 2161 if (*negp) {
2162 if (*lvalp > (unsigned long) INT_MAX + 1)
2163 return -EINVAL;
2164 *valp = -*lvalp;
2165 } else {
2166 if (*lvalp > (unsigned long) INT_MAX)
2167 return -EINVAL;
2168 *valp = *lvalp;
2169 }
1da177e4
LT		 2170 } else {
2171 int val = *valp;
2172 if (val < 0) {
00b7c339 2173 *negp = true;
9a5bc726 2174 *lvalp = -(unsigned long)val;
1da177e4 2175 } else {
00b7c339 2176 *negp = false;
1da177e4
LT		 2177 *lvalp = (unsigned long)val;
2178 }
2179 }
2180 return 0;
2181}
2182
4f2fec00
LR		 2183static int do_proc_douintvec_conv(unsigned long *lvalp,
2184 unsigned int *valp,
2185 int write, void *data)
e7d316a0
SAK		 2186{
2187 if (write) {
4f2fec00 2188 if (*lvalp > UINT_MAX)
e7d316a0 2189 return -EINVAL;
425fffd8
LZ		 2190 if (*lvalp > UINT_MAX)
2191 return -EINVAL;
e7d316a0
SAK		 2192 *valp = *lvalp;
2193 } else {
2194 unsigned int val = *valp;
2195 *lvalp = (unsigned long)val;
2196 }
2197 return 0;
2198}
2199
00b7c339
AW		 2200static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2201
d8217f07 2202static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2203 int write, void __user *buffer,
fcfbd547 2204 size_t *lenp, loff_t *ppos,
00b7c339 2205 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2206 int write, void *data),
2207 void *data)
2208{
00b7c339 2209 int *i, vleft, first = 1, err = 0;
00b7c339 2210 size_t left;
70f6cbb6 2211 char *kbuf = NULL, *p;
1da177e4 2212
00b7c339 2213 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2214 *lenp = 0;
2215 return 0;
2216 }
2217
fcfbd547 2218 i = (int *) tbl_data;
1da177e4
LT		 2219 vleft = table->maxlen / sizeof(*i);
2220 left = *lenp;
2221
2222 if (!conv)
2223 conv = do_proc_dointvec_conv;
2224
00b7c339 2225 if (write) {
d383d484
LR		 2226 if (proc_first_pos_non_zero_ignore(ppos, table))
2227 goto out;
f4aacea2 2228
00b7c339
AW		 2229 if (left > PAGE_SIZE - 1)
2230 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2231 p = kbuf = memdup_user_nul(buffer, left);
2232 if (IS_ERR(kbuf))
2233 return PTR_ERR(kbuf);
00b7c339
AW		 2234 }
2235
1da177e4 2236 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2237 unsigned long lval;
2238 bool neg;
1da177e4 2239
00b7c339 2240 if (write) {
70f6cbb6 2241 left -= proc_skip_spaces(&p);
1da177e4 2242
563b0467
O		 2243 if (!left)
2244 break;
70f6cbb6 2245 err = proc_get_long(&p, &left, &lval, &neg,
00b7c339
AW		 2246 proc_wspace_sep,
2247 sizeof(proc_wspace_sep), NULL);
2248 if (err)
1da177e4 2249 break;
00b7c339
AW		 2250 if (conv(&neg, &lval, i, 1, data)) {
2251 err = -EINVAL;
1da177e4 2252 break;
00b7c339 2253 }
1da177e4 2254 } else {
00b7c339
AW		 2255 if (conv(&neg, &lval, i, 0, data)) {
2256 err = -EINVAL;
2257 break;
2258 }
1da177e4 2259 if (!first)
00b7c339
AW		 2260 err = proc_put_char(&buffer, &left, '\t');
2261 if (err)
2262 break;
2263 err = proc_put_long(&buffer, &left, lval, neg);
2264 if (err)
1da177e4 2265 break;
1da177e4
LT		 2266 }
2267 }
2268
00b7c339
AW		 2269 if (!write && !first && left && !err)
2270 err = proc_put_char(&buffer, &left, '\n');
563b0467 2271 if (write && !err && left)
70f6cbb6 2272 left -= proc_skip_spaces(&p);
1da177e4 2273 if (write) {
70f6cbb6 2274 kfree(kbuf);
00b7c339
AW		 2275 if (first)
2276 return err ? : -EINVAL;
1da177e4 2277 }
1da177e4 2278 *lenp -= left;
f4aacea2 2279out:
1da177e4 2280 *ppos += *lenp;
00b7c339 2281 return err;
1da177e4
LT		 2282}
2283
8d65af78 2284static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2285 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2286 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2287 int write, void *data),
2288 void *data)
2289{
8d65af78 2290 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2291 buffer, lenp, ppos, conv, data);
2292}
2293
4f2fec00
LR		 2294static int do_proc_douintvec_w(unsigned int *tbl_data,
2295 struct ctl_table *table,
2296 void __user *buffer,
2297 size_t *lenp, loff_t *ppos,
2298 int (*conv)(unsigned long *lvalp,
2299 unsigned int *valp,
2300 int write, void *data),
2301 void *data)
2302{
2303 unsigned long lval;
2304 int err = 0;
2305 size_t left;
2306 bool neg;
2307 char *kbuf = NULL, *p;
2308
2309 left = *lenp;
2310
2311 if (proc_first_pos_non_zero_ignore(ppos, table))
2312 goto bail_early;
2313
2314 if (left > PAGE_SIZE - 1)
2315 left = PAGE_SIZE - 1;
2316
2317 p = kbuf = memdup_user_nul(buffer, left);
2318 if (IS_ERR(kbuf))
2319 return -EINVAL;
2320
2321 left -= proc_skip_spaces(&p);
2322 if (!left) {
2323 err = -EINVAL;
2324 goto out_free;
2325 }
2326
2327 err = proc_get_long(&p, &left, &lval, &neg,
2328 proc_wspace_sep,
2329 sizeof(proc_wspace_sep), NULL);
2330 if (err || neg) {
2331 err = -EINVAL;
2332 goto out_free;
2333 }
2334
2335 if (conv(&lval, tbl_data, 1, data)) {
2336 err = -EINVAL;
2337 goto out_free;
2338 }
2339
2340 if (!err && left)
2341 left -= proc_skip_spaces(&p);
2342
2343out_free:
2344 kfree(kbuf);
2345 if (err)
2346 return -EINVAL;
2347
2348 return 0;
2349
2350 /* This is in keeping with old __do_proc_dointvec() */
2351bail_early:
2352 *ppos += *lenp;
2353 return err;
2354}
2355
2356static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2357 size_t *lenp, loff_t *ppos,
2358 int (*conv)(unsigned long *lvalp,
2359 unsigned int *valp,
2360 int write, void *data),
2361 void *data)
2362{
2363 unsigned long lval;
2364 int err = 0;
2365 size_t left;
2366
2367 left = *lenp;
2368
2369 if (conv(&lval, tbl_data, 0, data)) {
2370 err = -EINVAL;
2371 goto out;
2372 }
2373
2374 err = proc_put_long(&buffer, &left, lval, false);
2375 if (err || !left)
2376 goto out;
2377
2378 err = proc_put_char(&buffer, &left, '\n');
2379
2380out:
2381 *lenp -= left;
2382 *ppos += *lenp;
2383
2384 return err;
2385}
2386
2387static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2388 int write, void __user *buffer,
2389 size_t *lenp, loff_t *ppos,
2390 int (*conv)(unsigned long *lvalp,
2391 unsigned int *valp,
2392 int write, void *data),
2393 void *data)
2394{
2395 unsigned int *i, vleft;
2396
2397 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2398 *lenp = 0;
2399 return 0;
2400 }
2401
2402 i = (unsigned int *) tbl_data;
2403 vleft = table->maxlen / sizeof(*i);
2404
2405 /*
2406 * Arrays are not supported, keep this simple. *Do not* add
2407 * support for them.
2408 */
2409 if (vleft != 1) {
2410 *lenp = 0;
2411 return -EINVAL;
2412 }
2413
2414 if (!conv)
2415 conv = do_proc_douintvec_conv;
2416
2417 if (write)
2418 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2419 conv, data);
2420 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2421}
2422
2423static int do_proc_douintvec(struct ctl_table *table, int write,
2424 void __user *buffer, size_t *lenp, loff_t *ppos,
2425 int (*conv)(unsigned long *lvalp,
2426 unsigned int *valp,
2427 int write, void *data),
2428 void *data)
2429{
2430 return __do_proc_douintvec(table->data, table, write,
2431 buffer, lenp, ppos, conv, data);
2432}
2433
1da177e4
LT		 2434/**
2435 * proc_dointvec - read a vector of integers
2436 * @table: the sysctl table
2437 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2438 * @buffer: the user buffer
2439 * @lenp: the size of the user buffer
2440 * @ppos: file position
2441 *
2442 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2443 * values from/to the user buffer, treated as an ASCII string.
2444 *
2445 * Returns 0 on success.
2446 */
8d65af78 2447int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2448 void __user *buffer, size_t *lenp, loff_t *ppos)
2449{
e7d316a0
SAK		 2450 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2451}
2452
2453/**
2454 * proc_douintvec - read a vector of unsigned integers
2455 * @table: the sysctl table
2456 * @write: %TRUE if this is a write to the sysctl file
2457 * @buffer: the user buffer
2458 * @lenp: the size of the user buffer
2459 * @ppos: file position
2460 *
2461 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2462 * values from/to the user buffer, treated as an ASCII string.
2463 *
2464 * Returns 0 on success.
2465 */
2466int proc_douintvec(struct ctl_table *table, int write,
2467 void __user *buffer, size_t *lenp, loff_t *ppos)
2468{
4f2fec00
LR		 2469 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2470 do_proc_douintvec_conv, NULL);
1da177e4
LT		 2471}
2472
34f5a398 2473/*
25ddbb18
AK		 2474 * Taint values can only be increased
2475 * This means we can safely use a temporary.
34f5a398 2476 */
8d65af78 2477static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2478 void __user *buffer, size_t *lenp, loff_t *ppos)
2479{
25ddbb18
AK		 2480 struct ctl_table t;
2481 unsigned long tmptaint = get_taint();
2482 int err;
34f5a398 2483
91fcd412 2484 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2485 return -EPERM;
2486
25ddbb18
AK		 2487 t = *table;
2488 t.data = &tmptaint;
8d65af78 2489 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2490 if (err < 0)
2491 return err;
2492
2493 if (write) {
2494 /*
2495 * Poor man's atomic or. Not worth adding a primitive
2496 * to everyone's atomic.h for this
2497 */
2498 int i;
2499 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2500 if ((tmptaint >> i) & 1)
373d4d09 2501 add_taint(i, LOCKDEP_STILL_OK);
25ddbb18
AK		 2502 }
2503 }
2504
2505 return err;
34f5a398
TT		 2506}
2507
bfdc0b49 2508#ifdef CONFIG_PRINTK
620f6e8e 2509static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
bfdc0b49
RW		 2510 void __user *buffer, size_t *lenp, loff_t *ppos)
2511{
2512 if (write && !capable(CAP_SYS_ADMIN))
2513 return -EPERM;
2514
2515 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2516}
2517#endif
2518
1da177e4
LT		 2519struct do_proc_dointvec_minmax_conv_param {
2520 int *min;
2521 int *max;
2522};
2523
00b7c339
AW		 2524static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2525 int *valp,
1da177e4
LT		 2526 int write, void *data)
2527{
2528 struct do_proc_dointvec_minmax_conv_param *param = data;
2529 if (write) {
2530 int val = *negp ? -*lvalp : *lvalp;
2531 if ((param->min && *param->min > val) ||
2532 (param->max && *param->max < val))
2533 return -EINVAL;
2534 *valp = val;
2535 } else {
2536 int val = *valp;
2537 if (val < 0) {
00b7c339 2538 *negp = true;
9a5bc726 2539 *lvalp = -(unsigned long)val;
1da177e4 2540 } else {
00b7c339 2541 *negp = false;
1da177e4
LT		 2542 *lvalp = (unsigned long)val;
2543 }
2544 }
2545 return 0;
2546}
2547
2548/**
2549 * proc_dointvec_minmax - read a vector of integers with min/max values
2550 * @table: the sysctl table
2551 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2552 * @buffer: the user buffer
2553 * @lenp: the size of the user buffer
2554 * @ppos: file position
2555 *
2556 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2557 * values from/to the user buffer, treated as an ASCII string.
2558 *
2559 * This routine will ensure the values are within the range specified by
2560 * table->extra1 (min) and table->extra2 (max).
2561 *
2562 * Returns 0 on success.
2563 */
8d65af78 2564int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2565 void __user *buffer, size_t *lenp, loff_t *ppos)
2566{
2567 struct do_proc_dointvec_minmax_conv_param param = {
2568 .min = (int *) table->extra1,
2569 .max = (int *) table->extra2,
2570 };
8d65af78 2571 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2572 do_proc_dointvec_minmax_conv, &param);
2573}
2574
61d9b56a
LR		 2575struct do_proc_douintvec_minmax_conv_param {
2576 unsigned int *min;
2577 unsigned int *max;
2578};
2579
2580static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2581 unsigned int *valp,
2582 int write, void *data)
2583{
2584 struct do_proc_douintvec_minmax_conv_param *param = data;
2585
2586 if (write) {
2587 unsigned int val = *lvalp;
2588
2589 if ((param->min && *param->min > val) ||
2590 (param->max && *param->max < val))
2591 return -ERANGE;
2592
2593 if (*lvalp > UINT_MAX)
2594 return -EINVAL;
2595 *valp = val;
2596 } else {
2597 unsigned int val = *valp;
2598 *lvalp = (unsigned long) val;
2599 }
2600
2601 return 0;
2602}
2603
2604/**
2605 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2606 * @table: the sysctl table
2607 * @write: %TRUE if this is a write to the sysctl file
2608 * @buffer: the user buffer
2609 * @lenp: the size of the user buffer
2610 * @ppos: file position
2611 *
2612 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2613 * values from/to the user buffer, treated as an ASCII string. Negative
2614 * strings are not allowed.
2615 *
2616 * This routine will ensure the values are within the range specified by
2617 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2618 * check for UINT_MAX to avoid having to support wrap around uses from
2619 * userspace.
2620 *
2621 * Returns 0 on success.
2622 */
2623int proc_douintvec_minmax(struct ctl_table *table, int write,
2624 void __user *buffer, size_t *lenp, loff_t *ppos)
2625{
2626 struct do_proc_douintvec_minmax_conv_param param = {
2627 .min = (unsigned int *) table->extra1,
2628 .max = (unsigned int *) table->extra2,
2629 };
2630 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2631 do_proc_douintvec_minmax_conv, &param);
2632}
2633
54b50199
KC		 2634static void validate_coredump_safety(void)
2635{
046d662f 2636#ifdef CONFIG_COREDUMP
e579d2c2 2637 if (suid_dumpable == SUID_DUMP_ROOT &&
54b50199 2638 core_pattern[0] != '/' && core_pattern[0] != '|') {
760c6a91
AD		 2639 printk(KERN_WARNING
2640"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2641"Pipe handler or fully qualified core dump path required.\n"
2642"Set kernel.core_pattern before fs.suid_dumpable.\n"
2643 );
54b50199 2644 }
046d662f 2645#endif
54b50199
KC		 2646}
2647
2648static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2649 void __user *buffer, size_t *lenp, loff_t *ppos)
2650{
2651 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2652 if (!error)
2653 validate_coredump_safety();
2654 return error;
2655}
2656
046d662f 2657#ifdef CONFIG_COREDUMP
54b50199
KC		 2658static int proc_dostring_coredump(struct ctl_table *table, int write,
2659 void __user *buffer, size_t *lenp, loff_t *ppos)
2660{
2661 int error = proc_dostring(table, write, buffer, lenp, ppos);
2662 if (!error)
2663 validate_coredump_safety();
2664 return error;
2665}
046d662f 2666#endif
54b50199 2667
d8217f07 2668static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2669 void __user *buffer,
2670 size_t *lenp, loff_t *ppos,
2671 unsigned long convmul,
2672 unsigned long convdiv)
2673{
00b7c339
AW		 2674 unsigned long *i, *min, *max;
2675 int vleft, first = 1, err = 0;
00b7c339 2676 size_t left;
70f6cbb6 2677 char *kbuf = NULL, *p;
00b7c339
AW		 2678
2679 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2680 *lenp = 0;
2681 return 0;
2682 }
00b7c339 2683
fcfbd547 2684 i = (unsigned long *) data;
1da177e4
LT		 2685 min = (unsigned long *) table->extra1;
2686 max = (unsigned long *) table->extra2;
2687 vleft = table->maxlen / sizeof(unsigned long);
2688 left = *lenp;
00b7c339
AW		 2689
2690 if (write) {
d383d484
LR		 2691 if (proc_first_pos_non_zero_ignore(ppos, table))
2692 goto out;
f4aacea2 2693
00b7c339
AW		 2694 if (left > PAGE_SIZE - 1)
2695 left = PAGE_SIZE - 1;
70f6cbb6
AV		 2696 p = kbuf = memdup_user_nul(buffer, left);
2697 if (IS_ERR(kbuf))
2698 return PTR_ERR(kbuf);
00b7c339
AW		 2699 }
2700
27b3d80a 2701 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2702 unsigned long val;
2703
1da177e4 2704 if (write) {
00b7c339
AW		 2705 bool neg;
2706
70f6cbb6 2707 left -= proc_skip_spaces(&p);
00b7c339 2708
70f6cbb6 2709 err = proc_get_long(&p, &left, &val, &neg,
00b7c339
AW		 2710 proc_wspace_sep,
2711 sizeof(proc_wspace_sep), NULL);
2712 if (err)
1da177e4
LT		 2713 break;
2714 if (neg)
1da177e4 2715 continue;
ff9f8a7c 2716 val = convmul * val / convdiv;
1da177e4
LT		 2717 if ((min && val < *min) || (max && val > *max))
2718 continue;
2719 *i = val;
2720 } else {
00b7c339 2721 val = convdiv * (*i) / convmul;
7833819d 2722 if (!first) {
00b7c339 2723 err = proc_put_char(&buffer, &left, '\t');
7833819d
CG		 2724 if (err)
2725 break;
2726 }
00b7c339
AW		 2727 err = proc_put_long(&buffer, &left, val, false);
2728 if (err)
2729 break;
1da177e4
LT		 2730 }
2731 }
2732
00b7c339
AW		 2733 if (!write && !first && left && !err)
2734 err = proc_put_char(&buffer, &left, '\n');
2735 if (write && !err)
70f6cbb6 2736 left -= proc_skip_spaces(&p);
1da177e4 2737 if (write) {
70f6cbb6 2738 kfree(kbuf);
00b7c339
AW		 2739 if (first)
2740 return err ? : -EINVAL;
1da177e4 2741 }
1da177e4 2742 *lenp -= left;
f4aacea2 2743out:
1da177e4 2744 *ppos += *lenp;
00b7c339 2745 return err;
1da177e4
LT		 2746}
2747
d8217f07 2748static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2749 void __user *buffer,
2750 size_t *lenp, loff_t *ppos,
2751 unsigned long convmul,
2752 unsigned long convdiv)
2753{
2754 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2755 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2756}
2757
1da177e4
LT		 2758/**
2759 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2760 * @table: the sysctl table
2761 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2762 * @buffer: the user buffer
2763 * @lenp: the size of the user buffer
2764 * @ppos: file position
2765 *
2766 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2767 * values from/to the user buffer, treated as an ASCII string.
2768 *
2769 * This routine will ensure the values are within the range specified by
2770 * table->extra1 (min) and table->extra2 (max).
2771 *
2772 * Returns 0 on success.
2773 */
8d65af78 2774int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2775 void __user *buffer, size_t *lenp, loff_t *ppos)
2776{
8d65af78 2777 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2778}
2779
2780/**
2781 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2782 * @table: the sysctl table
2783 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2784 * @buffer: the user buffer
2785 * @lenp: the size of the user buffer
2786 * @ppos: file position
2787 *
2788 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2789 * values from/to the user buffer, treated as an ASCII string. The values
2790 * are treated as milliseconds, and converted to jiffies when they are stored.
2791 *
2792 * This routine will ensure the values are within the range specified by
2793 * table->extra1 (min) and table->extra2 (max).
2794 *
2795 * Returns 0 on success.
2796 */
d8217f07 2797int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2798 void __user *buffer,
2799 size_t *lenp, loff_t *ppos)
2800{
8d65af78 2801 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2802 lenp, ppos, HZ, 1000l);
2803}
2804
2805
00b7c339 2806static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2807 int *valp,
2808 int write, void *data)
2809{
2810 if (write) {
63259457 2811 if (*lvalp > INT_MAX / HZ)
cba9f33d 2812 return 1;
1da177e4
LT		 2813 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2814 } else {
2815 int val = *valp;
2816 unsigned long lval;
2817 if (val < 0) {
00b7c339 2818 *negp = true;
9a5bc726 2819 lval = -(unsigned long)val;
1da177e4 2820 } else {
00b7c339 2821 *negp = false;
1da177e4
LT		 2822 lval = (unsigned long)val;
2823 }
2824 *lvalp = lval / HZ;
2825 }
2826 return 0;
2827}
2828
00b7c339 2829static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2830 int *valp,
2831 int write, void *data)
2832{
2833 if (write) {
cba9f33d
BS		 2834 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2835 return 1;
1da177e4
LT		 2836 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2837 } else {
2838 int val = *valp;
2839 unsigned long lval;
2840 if (val < 0) {
00b7c339 2841 *negp = true;
9a5bc726 2842 lval = -(unsigned long)val;
1da177e4 2843 } else {
00b7c339 2844 *negp = false;
1da177e4
LT		 2845 lval = (unsigned long)val;
2846 }
2847 *lvalp = jiffies_to_clock_t(lval);
2848 }
2849 return 0;
2850}
2851
00b7c339 2852static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2853 int *valp,
2854 int write, void *data)
2855{
2856 if (write) {
d738ce8f
FF		 2857 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2858
2859 if (jif > INT_MAX)
2860 return 1;
2861 *valp = (int)jif;
1da177e4
LT		 2862 } else {
2863 int val = *valp;
2864 unsigned long lval;
2865 if (val < 0) {
00b7c339 2866 *negp = true;
9a5bc726 2867 lval = -(unsigned long)val;
1da177e4 2868 } else {
00b7c339 2869 *negp = false;
1da177e4
LT		 2870 lval = (unsigned long)val;
2871 }
2872 *lvalp = jiffies_to_msecs(lval);
2873 }
2874 return 0;
2875}
2876
2877/**
2878 * proc_dointvec_jiffies - read a vector of integers as seconds
2879 * @table: the sysctl table
2880 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2881 * @buffer: the user buffer
2882 * @lenp: the size of the user buffer
2883 * @ppos: file position
2884 *
2885 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2886 * values from/to the user buffer, treated as an ASCII string.
2887 * The values read are assumed to be in seconds, and are converted into
2888 * jiffies.
2889 *
2890 * Returns 0 on success.
2891 */
8d65af78 2892int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2893 void __user *buffer, size_t *lenp, loff_t *ppos)
2894{
8d65af78 2895 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2896 do_proc_dointvec_jiffies_conv,NULL);
2897}
2898
2899/**
2900 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2901 * @table: the sysctl table
2902 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2903 * @buffer: the user buffer
2904 * @lenp: the size of the user buffer
1e5d5331 2905 * @ppos: pointer to the file position
1da177e4
LT		 2906 *
2907 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2908 * values from/to the user buffer, treated as an ASCII string.
2909 * The values read are assumed to be in 1/USER_HZ seconds, and
2910 * are converted into jiffies.
2911 *
2912 * Returns 0 on success.
2913 */
8d65af78 2914int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2915 void __user *buffer, size_t *lenp, loff_t *ppos)
2916{
8d65af78 2917 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2918 do_proc_dointvec_userhz_jiffies_conv,NULL);
2919}
2920
2921/**
2922 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2923 * @table: the sysctl table
2924 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2925 * @buffer: the user buffer
2926 * @lenp: the size of the user buffer
67be2dd1
MW		 2927 * @ppos: file position
2928 * @ppos: the current position in the file
1da177e4
LT		 2929 *
2930 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2931 * values from/to the user buffer, treated as an ASCII string.
2932 * The values read are assumed to be in 1/1000 seconds, and
2933 * are converted into jiffies.
2934 *
2935 * Returns 0 on success.
2936 */
8d65af78 2937int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2938 void __user *buffer, size_t *lenp, loff_t *ppos)
2939{
8d65af78 2940 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2941 do_proc_dointvec_ms_jiffies_conv, NULL);
2942}
2943
8d65af78 2944static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2945 void __user *buffer, size_t *lenp, loff_t *ppos)
2946{
2947 struct pid *new_pid;
2948 pid_t tmp;
2949 int r;
2950
6c5f3e7b 2951 tmp = pid_vnr(cad_pid);
9ec52099 2952
8d65af78 2953 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2954 lenp, ppos, NULL, NULL);
2955 if (r || !write)
2956 return r;
2957
2958 new_pid = find_get_pid(tmp);
2959 if (!new_pid)
2960 return -ESRCH;
2961
2962 put_pid(xchg(&cad_pid, new_pid));
2963 return 0;
2964}
2965
9f977fb7
OP		 2966/**
2967 * proc_do_large_bitmap - read/write from/to a large bitmap
2968 * @table: the sysctl table
2969 * @write: %TRUE if this is a write to the sysctl file
2970 * @buffer: the user buffer
2971 * @lenp: the size of the user buffer
2972 * @ppos: file position
2973 *
2974 * The bitmap is stored at table->data and the bitmap length (in bits)
2975 * in table->maxlen.
2976 *
2977 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2978 * large bitmaps may be represented in a compact manner. Writing into
2979 * the file will clear the bitmap then update it with the given input.
2980 *
2981 * Returns 0 on success.
2982 */
2983int proc_do_large_bitmap(struct ctl_table *table, int write,
2984 void __user *buffer, size_t *lenp, loff_t *ppos)
2985{
2986 int err = 0;
2987 bool first = 1;
2988 size_t left = *lenp;
2989 unsigned long bitmap_len = table->maxlen;
122ff243 2990 unsigned long *bitmap = *(unsigned long **) table->data;
9f977fb7
OP		 2991 unsigned long *tmp_bitmap = NULL;
2992 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2993
122ff243 2994 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
9f977fb7
OP		 2995 *lenp = 0;
2996 return 0;
2997 }
2998
2999 if (write) {
70f6cbb6 3000 char *kbuf, *p;
9f977fb7
OP		 3001
3002 if (left > PAGE_SIZE - 1)
3003 left = PAGE_SIZE - 1;
3004
70f6cbb6
AV		 3005 p = kbuf = memdup_user_nul(buffer, left);
3006 if (IS_ERR(kbuf))
3007 return PTR_ERR(kbuf);
9f977fb7
OP		 3008
3009 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3010 GFP_KERNEL);
3011 if (!tmp_bitmap) {
70f6cbb6 3012 kfree(kbuf);
9f977fb7
OP		 3013 return -ENOMEM;
3014 }
70f6cbb6 3015 proc_skip_char(&p, &left, '\n');
9f977fb7
OP		 3016 while (!err && left) {
3017 unsigned long val_a, val_b;
3018 bool neg;
3019
70f6cbb6 3020 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
9f977fb7
OP		 3021 sizeof(tr_a), &c);
3022 if (err)
3023 break;
3024 if (val_a >= bitmap_len || neg) {
3025 err = -EINVAL;
3026 break;
3027 }
3028
3029 val_b = val_a;
3030 if (left) {
70f6cbb6 3031 p++;
9f977fb7
OP		 3032 left--;
3033 }
3034
3035 if (c == '-') {
70f6cbb6 3036 err = proc_get_long(&p, &left, &val_b,
9f977fb7
OP		 3037 &neg, tr_b, sizeof(tr_b),
3038 &c);
3039 if (err)
3040 break;
3041 if (val_b >= bitmap_len || neg ||
3042 val_a > val_b) {
3043 err = -EINVAL;
3044 break;
3045 }
3046 if (left) {
70f6cbb6 3047 p++;
9f977fb7
OP		 3048 left--;
3049 }
3050 }
3051
5a04cca6 3052 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
9f977fb7 3053 first = 0;
70f6cbb6 3054 proc_skip_char(&p, &left, '\n');
9f977fb7 3055 }
70f6cbb6 3056 kfree(kbuf);
9f977fb7
OP		 3057 } else {
3058 unsigned long bit_a, bit_b = 0;
3059
3060 while (left) {
3061 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3062 if (bit_a >= bitmap_len)
3063 break;
3064 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3065 bit_a + 1) - 1;
3066
3067 if (!first) {
3068 err = proc_put_char(&buffer, &left, ',');
3069 if (err)
3070 break;
3071 }
3072 err = proc_put_long(&buffer, &left, bit_a, false);
3073 if (err)
3074 break;
3075 if (bit_a != bit_b) {
3076 err = proc_put_char(&buffer, &left, '-');
3077 if (err)
3078 break;
3079 err = proc_put_long(&buffer, &left, bit_b, false);
3080 if (err)
3081 break;
3082 }
3083
3084 first = 0; bit_b++;
3085 }
3086 if (!err)
3087 err = proc_put_char(&buffer, &left, '\n');
3088 }
3089
3090 if (!err) {
3091 if (write) {
3092 if (*ppos)
3093 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3094 else
5a04cca6 3095 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
9f977fb7
OP		 3096 }
3097 kfree(tmp_bitmap);
3098 *lenp -= left;
3099 *ppos += *lenp;
3100 return 0;
3101 } else {
3102 kfree(tmp_bitmap);
3103 return err;
3104 }
3105}
3106
55610500 3107#else /* CONFIG_PROC_SYSCTL */
1da177e4 3108
8d65af78 3109int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 3110 void __user *buffer, size_t *lenp, loff_t *ppos)
3111{
3112 return -ENOSYS;
3113}
3114
8d65af78 3115int proc_dointvec(struct ctl_table *table, int write,
1da177e4 3116 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 3117{
3118 return -ENOSYS;
3119}
3120
e7d316a0
SAK		 3121int proc_douintvec(struct ctl_table *table, int write,
3122 void __user *buffer, size_t *lenp, loff_t *ppos)
3123{
3124 return -ENOSYS;
3125}
3126
8d65af78 3127int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3128 void __user *buffer, size_t *lenp, loff_t *ppos)
3129{
3130 return -ENOSYS;
3131}
3132
61d9b56a
LR		 3133int proc_douintvec_minmax(struct ctl_table *table, int write,
3134 void __user *buffer, size_t *lenp, loff_t *ppos)
3135{
3136 return -ENOSYS;
3137}
3138
8d65af78 3139int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3140 void __user *buffer, size_t *lenp, loff_t *ppos)
3141{
3142 return -ENOSYS;
3143}
3144
8d65af78 3145int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3146 void __user *buffer, size_t *lenp, loff_t *ppos)
3147{
3148 return -ENOSYS;
3149}
3150
8d65af78 3151int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 3152 void __user *buffer, size_t *lenp, loff_t *ppos)
3153{
3154 return -ENOSYS;
3155}
3156
8d65af78 3157int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3158 void __user *buffer, size_t *lenp, loff_t *ppos)
3159{
3160 return -ENOSYS;
3161}
3162
d8217f07 3163int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 3164 void __user *buffer,
3165 size_t *lenp, loff_t *ppos)
3166{
3167 return -ENOSYS;
3168}
3169
3170
55610500 3171#endif /* CONFIG_PROC_SYSCTL */
1da177e4 3172
1da177e4
LT		 3173/*
3174 * No sense putting this after each symbol definition, twice,
3175 * exception granted :-)
3176 */
3177EXPORT_SYMBOL(proc_dointvec);
e7d316a0 3178EXPORT_SYMBOL(proc_douintvec);
1da177e4
LT		 3179EXPORT_SYMBOL(proc_dointvec_jiffies);
3180EXPORT_SYMBOL(proc_dointvec_minmax);
61d9b56a 3181EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
1da177e4
LT		 3182EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3183EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3184EXPORT_SYMBOL(proc_dostring);
3185EXPORT_SYMBOL(proc_doulongvec_minmax);
3186EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Empty description
This page took 1.632262 seconds and 4 git commands to generate.