projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/acme...
[GitHub/mt8127/android_kernel_alcatel_ttab.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
LT		 21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
d33ed52d 26#include <linux/signal.h>
455cd5ab 27#include <linux/printk.h>
1da177e4 28#include <linux/proc_fs.h>
72c2d582 29#include <linux/security.h>
1da177e4 30#include <linux/ctype.h>
dfec072e 31#include <linux/kmemcheck.h>
62239ac2 32#include <linux/fs.h>
1da177e4
LT		 33#include <linux/init.h>
34#include <linux/kernel.h>
0296b228 35#include <linux/kobject.h>
20380731 36#include <linux/net.h>
1da177e4
LT		 37#include <linux/sysrq.h>
38#include <linux/highuid.h>
39#include <linux/writeback.h>
3fff4c42 40#include <linux/ratelimit.h>
76ab0f53 41#include <linux/compaction.h>
1da177e4 42#include <linux/hugetlb.h>
1da177e4 43#include <linux/initrd.h>
0b77f5bf 44#include <linux/key.h>
1da177e4
LT		 45#include <linux/times.h>
46#include <linux/limits.h>
47#include <linux/dcache.h>
6e006701 48#include <linux/dnotify.h>
1da177e4 49#include <linux/syscalls.h>
c748e134 50#include <linux/vmstat.h>
c255d844
PM		 51#include <linux/nfs_fs.h>
52#include <linux/acpi.h>
10a0a8d4 53#include <linux/reboot.h>
b0fc494f 54#include <linux/ftrace.h>
cdd6c482 55#include <linux/perf_event.h>
b2be84df 56#include <linux/kprobes.h>
b492e95b 57#include <linux/pipe_fs_i.h>
8e4228e1 58#include <linux/oom.h>
17f60a7d 59#include <linux/kmod.h>
1da177e4
LT		 60
61#include <asm/uaccess.h>
62#include <asm/processor.h>
63
29cbc78b
AK		 64#ifdef CONFIG_X86
65#include <asm/nmi.h>
0741f4d2 66#include <asm/stacktrace.h>
6e7c4025 67#include <asm/io.h>
29cbc78b 68#endif
c55b7c3e
DY		 69#ifdef CONFIG_BSD_PROCESS_ACCT
70#include <linux/acct.h>
71#endif
4f0e056f
DY		 72#ifdef CONFIG_RT_MUTEXES
73#include <linux/rtmutex.h>
74#endif
2edf5e49
DY		 75#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
76#include <linux/lockdep.h>
77#endif
15485a46
DY		 78#ifdef CONFIG_CHR_DEV_SG
79#include <scsi/sg.h>
80#endif
29cbc78b 81
58687acb 82#ifdef CONFIG_LOCKUP_DETECTOR
504d7cf1
DZ		 83#include <linux/nmi.h>
84#endif
85
7058cb02 86
1da177e4
LT		 87#if defined(CONFIG_SYSCTL)
88
89/* External variables not in a header file. */
1da177e4
LT		 90extern int sysctl_overcommit_memory;
91extern int sysctl_overcommit_ratio;
92extern int max_threads;
1da177e4 93extern int core_uses_pid;
d6e71144 94extern int suid_dumpable;
1da177e4 95extern char core_pattern[];
a293980c 96extern unsigned int core_pipe_limit;
1da177e4
LT		 97extern int pid_max;
98extern int min_free_kbytes;
1da177e4 99extern int pid_max_min, pid_max_max;
9d0243bc 100extern int sysctl_drop_caches;
8ad4b1fb 101extern int percpu_pagelist_fraction;
bebfa101 102extern int compat_log;
9745512c 103extern int latencytop_enabled;
eceea0b3 104extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 105#ifndef CONFIG_MMU
106extern int sysctl_nr_trim_pages;
107#endif
cb684b5b 108#ifdef CONFIG_BLOCK
5e605b64 109extern int blk_iopoll_enabled;
cb684b5b 110#endif
1da177e4 111
c4f3b63f 112/* Constants used for minimum and maximum */
2508ce18 113#ifdef CONFIG_LOCKUP_DETECTOR
c4f3b63f 114static int sixty = 60;
9383d967 115static int neg_one = -1;
c4f3b63f
RT		 116#endif
117
c4f3b63f 118static int zero;
cd5f9a4c
LT		 119static int __maybe_unused one = 1;
120static int __maybe_unused two = 2;
cb16e95f 121static int __maybe_unused three = 3;
fc3501d4 122static unsigned long one_ul = 1;
c4f3b63f 123static int one_hundred = 100;
af91322e
DY		 124#ifdef CONFIG_PRINTK
125static int ten_thousand = 10000;
126#endif
c4f3b63f 127
9e4a5bda
AR		 128/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
129static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
130
1da177e4
LT		 131/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
132static int maxolduid = 65535;
133static int minolduid;
8ad4b1fb 134static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 135
136static int ngroups_max = NGROUPS_MAX;
137
d14f1729
DY		 138#ifdef CONFIG_INOTIFY_USER
139#include <linux/inotify.h>
140#endif
72c57ed5 141#ifdef CONFIG_SPARC
17f04fbb 142#include <asm/system.h>
1da177e4
LT		 143#endif
144
0871420f
DM		 145#ifdef CONFIG_SPARC64
146extern int sysctl_tsb_ratio;
147#endif
148
1da177e4
LT		 149#ifdef __hppa__
150extern int pwrsw_enabled;
151extern int unaligned_enabled;
152#endif
153
347a8dc3 154#ifdef CONFIG_S390
1da177e4
LT		 155#ifdef CONFIG_MATHEMU
156extern int sysctl_ieee_emulation_warnings;
157#endif
158extern int sysctl_userprocess_debug;
951f22d5 159extern int spin_retry;
1da177e4
LT		 160#endif
161
d2b176ed
JS		 162#ifdef CONFIG_IA64
163extern int no_unaligned_warning;
88fc241f 164extern int unaligned_dump_stack;
d2b176ed
JS		 165#endif
166
d6f8ff73 167#ifdef CONFIG_PROC_SYSCTL
8d65af78 168static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 169 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 170static int proc_taint(struct ctl_table *table, int write,
34f5a398 171 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 172#endif
9ec52099 173
bfdc0b49
RW		 174#ifdef CONFIG_PRINTK
175static int proc_dmesg_restrict(struct ctl_table *table, int write,
176 void __user *buffer, size_t *lenp, loff_t *ppos);
177#endif
178
97f5f0cd 179#ifdef CONFIG_MAGIC_SYSRQ
8c6a98b2
AW		 180/* Note: sysrq code uses it's own private copy */
181static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
97f5f0cd
DT		 182
183static int sysrq_sysctl_handler(ctl_table *table, int write,
184 void __user *buffer, size_t *lenp,
185 loff_t *ppos)
186{
187 int error;
188
189 error = proc_dointvec(table, write, buffer, lenp, ppos);
190 if (error)
191 return error;
192
193 if (write)
194 sysrq_toggle_support(__sysrq_enabled);
195
196 return 0;
197}
198
199#endif
200
d8217f07 201static struct ctl_table root_table[];
e51b6ba0
EB		 202static struct ctl_table_root sysctl_table_root;
203static struct ctl_table_header root_table_header = {
dfef6dcd 204 {{.count = 1,
e51b6ba0 205 .ctl_table = root_table,
dfef6dcd 206 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
e51b6ba0 207 .root = &sysctl_table_root,
73455092 208 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 209};
210static struct ctl_table_root sysctl_table_root = {
211 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 212 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 213};
1da177e4 214
d8217f07
EB		 215static struct ctl_table kern_table[];
216static struct ctl_table vm_table[];
217static struct ctl_table fs_table[];
218static struct ctl_table debug_table[];
219static struct ctl_table dev_table[];
220extern struct ctl_table random_table[];
7ef9964e
DL		 221#ifdef CONFIG_EPOLL
222extern struct ctl_table epoll_table[];
223#endif
1da177e4
LT		 224
225#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
226int sysctl_legacy_va_layout;
227#endif
228
1da177e4
LT		 229/* The default sysctl tables: */
230
d8217f07 231static struct ctl_table root_table[] = {
1da177e4 232 {
1da177e4
LT		 233 .procname = "kernel",
234 .mode = 0555,
235 .child = kern_table,
236 },
237 {
1da177e4
LT		 238 .procname = "vm",
239 .mode = 0555,
240 .child = vm_table,
241 },
1da177e4 242 {
1da177e4
LT		 243 .procname = "fs",
244 .mode = 0555,
245 .child = fs_table,
246 },
247 {
1da177e4
LT		 248 .procname = "debug",
249 .mode = 0555,
250 .child = debug_table,
251 },
252 {
1da177e4
LT		 253 .procname = "dev",
254 .mode = 0555,
255 .child = dev_table,
256 },
6fce56ec 257 { }
1da177e4
LT		 258};
259
77e54a1f 260#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 261static int min_sched_granularity_ns = 100000; /* 100 usecs */
262static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
263static int min_wakeup_granularity_ns; /* 0 usecs */
264static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
1983a922
CE		 265static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
266static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
77e54a1f
IM		 267#endif
268
5e771905
MG		 269#ifdef CONFIG_COMPACTION
270static int min_extfrag_threshold;
271static int max_extfrag_threshold = 1000;
272#endif
273
d8217f07 274static struct ctl_table kern_table[] = {
2bba22c5 275 {
2bba22c5
MG		 276 .procname = "sched_child_runs_first",
277 .data = &sysctl_sched_child_runs_first,
278 .maxlen = sizeof(unsigned int),
279 .mode = 0644,
6d456111 280 .proc_handler = proc_dointvec,
2bba22c5 281 },
77e54a1f
IM		 282#ifdef CONFIG_SCHED_DEBUG
283 {
b2be5e96
PZ		 284 .procname = "sched_min_granularity_ns",
285 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
702a7c76 288 .proc_handler = sched_proc_update_handler,
b2be5e96
PZ		 289 .extra1 = &min_sched_granularity_ns,
290 .extra2 = &max_sched_granularity_ns,
77e54a1f 291 },
21805085 292 {
21805085
PZ		 293 .procname = "sched_latency_ns",
294 .data = &sysctl_sched_latency,
295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
702a7c76 297 .proc_handler = sched_proc_update_handler,
21805085
PZ		 298 .extra1 = &min_sched_granularity_ns,
299 .extra2 = &max_sched_granularity_ns,
300 },
77e54a1f 301 {
77e54a1f
IM		 302 .procname = "sched_wakeup_granularity_ns",
303 .data = &sysctl_sched_wakeup_granularity,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
702a7c76 306 .proc_handler = sched_proc_update_handler,
77e54a1f
IM		 307 .extra1 = &min_wakeup_granularity_ns,
308 .extra2 = &max_wakeup_granularity_ns,
309 },
1983a922 310 {
1983a922
CE		 311 .procname = "sched_tunable_scaling",
312 .data = &sysctl_sched_tunable_scaling,
313 .maxlen = sizeof(enum sched_tunable_scaling),
314 .mode = 0644,
702a7c76 315 .proc_handler = sched_proc_update_handler,
1983a922
CE		 316 .extra1 = &min_sched_tunable_scaling,
317 .extra2 = &max_sched_tunable_scaling,
2398f2c6 318 },
da84d961 319 {
da84d961
IM		 320 .procname = "sched_migration_cost",
321 .data = &sysctl_sched_migration_cost,
322 .maxlen = sizeof(unsigned int),
323 .mode = 0644,
6d456111 324 .proc_handler = proc_dointvec,
da84d961 325 },
b82d9fdd 326 {
b82d9fdd
PZ		 327 .procname = "sched_nr_migrate",
328 .data = &sysctl_sched_nr_migrate,
329 .maxlen = sizeof(unsigned int),
fa85ae24 330 .mode = 0644,
6d456111 331 .proc_handler = proc_dointvec,
fa85ae24 332 },
e9e9250b 333 {
e9e9250b
PZ		 334 .procname = "sched_time_avg",
335 .data = &sysctl_sched_time_avg,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
6d456111 338 .proc_handler = proc_dointvec,
e9e9250b 339 },
a7a4f8a7
PT		 340 {
341 .procname = "sched_shares_window",
342 .data = &sysctl_sched_shares_window,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
cd1bb94b 347 {
cd1bb94b
AB		 348 .procname = "timer_migration",
349 .data = &sysctl_timer_migration,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
6d456111 352 .proc_handler = proc_dointvec_minmax,
bfdb4d9f
AB		 353 .extra1 = &zero,
354 .extra2 = &one,
fa85ae24 355 },
1fc84aaa 356#endif
9f0c1e56 357 {
9f0c1e56
PZ		 358 .procname = "sched_rt_period_us",
359 .data = &sysctl_sched_rt_period,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
6d456111 362 .proc_handler = sched_rt_handler,
9f0c1e56
PZ		 363 },
364 {
9f0c1e56
PZ		 365 .procname = "sched_rt_runtime_us",
366 .data = &sysctl_sched_rt_runtime,
367 .maxlen = sizeof(int),
368 .mode = 0644,
6d456111 369 .proc_handler = sched_rt_handler,
9f0c1e56 370 },
5091faa4
MG		 371#ifdef CONFIG_SCHED_AUTOGROUP
372 {
373 .procname = "sched_autogroup_enabled",
374 .data = &sysctl_sched_autogroup_enabled,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
1747b21f 377 .proc_handler = proc_dointvec_minmax,
5091faa4
MG		 378 .extra1 = &zero,
379 .extra2 = &one,
380 },
381#endif
f20786ff
PZ		 382#ifdef CONFIG_PROVE_LOCKING
383 {
f20786ff
PZ		 384 .procname = "prove_locking",
385 .data = &prove_locking,
386 .maxlen = sizeof(int),
387 .mode = 0644,
6d456111 388 .proc_handler = proc_dointvec,
f20786ff
PZ		 389 },
390#endif
391#ifdef CONFIG_LOCK_STAT
392 {
f20786ff
PZ		 393 .procname = "lock_stat",
394 .data = &lock_stat,
395 .maxlen = sizeof(int),
396 .mode = 0644,
6d456111 397 .proc_handler = proc_dointvec,
f20786ff 398 },
77e54a1f 399#endif
1da177e4 400 {
1da177e4
LT		 401 .procname = "panic",
402 .data = &panic_timeout,
403 .maxlen = sizeof(int),
404 .mode = 0644,
6d456111 405 .proc_handler = proc_dointvec,
1da177e4
LT		 406 },
407 {
1da177e4
LT		 408 .procname = "core_uses_pid",
409 .data = &core_uses_pid,
410 .maxlen = sizeof(int),
411 .mode = 0644,
6d456111 412 .proc_handler = proc_dointvec,
1da177e4
LT		 413 },
414 {
1da177e4
LT		 415 .procname = "core_pattern",
416 .data = core_pattern,
71ce92f3 417 .maxlen = CORENAME_MAX_SIZE,
1da177e4 418 .mode = 0644,
6d456111 419 .proc_handler = proc_dostring,
1da177e4 420 },
a293980c 421 {
a293980c
NH		 422 .procname = "core_pipe_limit",
423 .data = &core_pipe_limit,
424 .maxlen = sizeof(unsigned int),
425 .mode = 0644,
6d456111 426 .proc_handler = proc_dointvec,
a293980c 427 },
34f5a398 428#ifdef CONFIG_PROC_SYSCTL
1da177e4 429 {
1da177e4 430 .procname = "tainted",
25ddbb18 431 .maxlen = sizeof(long),
34f5a398 432 .mode = 0644,
6d456111 433 .proc_handler = proc_taint,
1da177e4 434 },
34f5a398 435#endif
9745512c
AV		 436#ifdef CONFIG_LATENCYTOP
437 {
438 .procname = "latencytop",
439 .data = &latencytop_enabled,
440 .maxlen = sizeof(int),
441 .mode = 0644,
6d456111 442 .proc_handler = proc_dointvec,
9745512c
AV		 443 },
444#endif
1da177e4
LT		 445#ifdef CONFIG_BLK_DEV_INITRD
446 {
1da177e4
LT		 447 .procname = "real-root-dev",
448 .data = &real_root_dev,
449 .maxlen = sizeof(int),
450 .mode = 0644,
6d456111 451 .proc_handler = proc_dointvec,
1da177e4
LT		 452 },
453#endif
45807a1d 454 {
45807a1d
IM		 455 .procname = "print-fatal-signals",
456 .data = &print_fatal_signals,
457 .maxlen = sizeof(int),
458 .mode = 0644,
6d456111 459 .proc_handler = proc_dointvec,
45807a1d 460 },
72c57ed5 461#ifdef CONFIG_SPARC
1da177e4 462 {
1da177e4
LT		 463 .procname = "reboot-cmd",
464 .data = reboot_command,
465 .maxlen = 256,
466 .mode = 0644,
6d456111 467 .proc_handler = proc_dostring,
1da177e4
LT		 468 },
469 {
1da177e4
LT		 470 .procname = "stop-a",
471 .data = &stop_a_enabled,
472 .maxlen = sizeof (int),
473 .mode = 0644,
6d456111 474 .proc_handler = proc_dointvec,
1da177e4
LT		 475 },
476 {
1da177e4
LT		 477 .procname = "scons-poweroff",
478 .data = &scons_pwroff,
479 .maxlen = sizeof (int),
480 .mode = 0644,
6d456111 481 .proc_handler = proc_dointvec,
1da177e4
LT		 482 },
483#endif
0871420f
DM		 484#ifdef CONFIG_SPARC64
485 {
0871420f
DM		 486 .procname = "tsb-ratio",
487 .data = &sysctl_tsb_ratio,
488 .maxlen = sizeof (int),
489 .mode = 0644,
6d456111 490 .proc_handler = proc_dointvec,
0871420f
DM		 491 },
492#endif
1da177e4
LT		 493#ifdef __hppa__
494 {
1da177e4
LT		 495 .procname = "soft-power",
496 .data = &pwrsw_enabled,
497 .maxlen = sizeof (int),
498 .mode = 0644,
6d456111 499 .proc_handler = proc_dointvec,
1da177e4
LT		 500 },
501 {
1da177e4
LT		 502 .procname = "unaligned-trap",
503 .data = &unaligned_enabled,
504 .maxlen = sizeof (int),
505 .mode = 0644,
6d456111 506 .proc_handler = proc_dointvec,
1da177e4
LT		 507 },
508#endif
509 {
1da177e4
LT		 510 .procname = "ctrl-alt-del",
511 .data = &C_A_D,
512 .maxlen = sizeof(int),
513 .mode = 0644,
6d456111 514 .proc_handler = proc_dointvec,
1da177e4 515 },
606576ce 516#ifdef CONFIG_FUNCTION_TRACER
b0fc494f 517 {
b0fc494f
SR		 518 .procname = "ftrace_enabled",
519 .data = &ftrace_enabled,
520 .maxlen = sizeof(int),
521 .mode = 0644,
6d456111 522 .proc_handler = ftrace_enable_sysctl,
b0fc494f
SR		 523 },
524#endif
f38f1d2a
SR		 525#ifdef CONFIG_STACK_TRACER
526 {
f38f1d2a
SR		 527 .procname = "stack_tracer_enabled",
528 .data = &stack_tracer_enabled,
529 .maxlen = sizeof(int),
530 .mode = 0644,
6d456111 531 .proc_handler = stack_trace_sysctl,
f38f1d2a
SR		 532 },
533#endif
944ac425
SR		 534#ifdef CONFIG_TRACING
535 {
3299b4dd 536 .procname = "ftrace_dump_on_oops",
944ac425
SR		 537 .data = &ftrace_dump_on_oops,
538 .maxlen = sizeof(int),
539 .mode = 0644,
6d456111 540 .proc_handler = proc_dointvec,
944ac425
SR		 541 },
542#endif
a1ef5adb 543#ifdef CONFIG_MODULES
1da177e4 544 {
1da177e4
LT		 545 .procname = "modprobe",
546 .data = &modprobe_path,
547 .maxlen = KMOD_PATH_LEN,
548 .mode = 0644,
6d456111 549 .proc_handler = proc_dostring,
1da177e4 550 },
3d43321b 551 {
3d43321b
KC		 552 .procname = "modules_disabled",
553 .data = &modules_disabled,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 /* only handle a transition from default "0" to "1" */
6d456111 557 .proc_handler = proc_dointvec_minmax,
3d43321b
KC		 558 .extra1 = &one,
559 .extra2 = &one,
560 },
1da177e4 561#endif
94f17cd7 562#ifdef CONFIG_HOTPLUG
1da177e4 563 {
1da177e4 564 .procname = "hotplug",
312c004d
KS		 565 .data = &uevent_helper,
566 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4 567 .mode = 0644,
6d456111 568 .proc_handler = proc_dostring,
1da177e4
LT		 569 },
570#endif
571#ifdef CONFIG_CHR_DEV_SG
572 {
1da177e4
LT		 573 .procname = "sg-big-buff",
574 .data = &sg_big_buff,
575 .maxlen = sizeof (int),
576 .mode = 0444,
6d456111 577 .proc_handler = proc_dointvec,
1da177e4
LT		 578 },
579#endif
580#ifdef CONFIG_BSD_PROCESS_ACCT
581 {
1da177e4
LT		 582 .procname = "acct",
583 .data = &acct_parm,
584 .maxlen = 3*sizeof(int),
585 .mode = 0644,
6d456111 586 .proc_handler = proc_dointvec,
1da177e4
LT		 587 },
588#endif
1da177e4
LT		 589#ifdef CONFIG_MAGIC_SYSRQ
590 {
1da177e4 591 .procname = "sysrq",
5d6f647f 592 .data = &__sysrq_enabled,
1da177e4
LT		 593 .maxlen = sizeof (int),
594 .mode = 0644,
97f5f0cd 595 .proc_handler = sysrq_sysctl_handler,
1da177e4
LT		 596 },
597#endif
d6f8ff73 598#ifdef CONFIG_PROC_SYSCTL
1da177e4 599 {
1da177e4 600 .procname = "cad_pid",
9ec52099 601 .data = NULL,
1da177e4
LT		 602 .maxlen = sizeof (int),
603 .mode = 0600,
6d456111 604 .proc_handler = proc_do_cad_pid,
1da177e4 605 },
d6f8ff73 606#endif
1da177e4 607 {
1da177e4
LT		 608 .procname = "threads-max",
609 .data = &max_threads,
610 .maxlen = sizeof(int),
611 .mode = 0644,
6d456111 612 .proc_handler = proc_dointvec,
1da177e4
LT		 613 },
614 {
1da177e4
LT		 615 .procname = "random",
616 .mode = 0555,
617 .child = random_table,
618 },
17f60a7d
EP		 619 {
620 .procname = "usermodehelper",
621 .mode = 0555,
622 .child = usermodehelper_table,
623 },
1da177e4 624 {
1da177e4
LT		 625 .procname = "overflowuid",
626 .data = &overflowuid,
627 .maxlen = sizeof(int),
628 .mode = 0644,
6d456111 629 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 630 .extra1 = &minolduid,
631 .extra2 = &maxolduid,
632 },
633 {
1da177e4
LT		 634 .procname = "overflowgid",
635 .data = &overflowgid,
636 .maxlen = sizeof(int),
637 .mode = 0644,
6d456111 638 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 639 .extra1 = &minolduid,
640 .extra2 = &maxolduid,
641 },
347a8dc3 642#ifdef CONFIG_S390
1da177e4
LT		 643#ifdef CONFIG_MATHEMU
644 {
1da177e4
LT		 645 .procname = "ieee_emulation_warnings",
646 .data = &sysctl_ieee_emulation_warnings,
647 .maxlen = sizeof(int),
648 .mode = 0644,
6d456111 649 .proc_handler = proc_dointvec,
1da177e4 650 },
1da177e4
LT		 651#endif
652 {
1da177e4 653 .procname = "userprocess_debug",
ab3c68ee 654 .data = &show_unhandled_signals,
1da177e4
LT		 655 .maxlen = sizeof(int),
656 .mode = 0644,
6d456111 657 .proc_handler = proc_dointvec,
1da177e4
LT		 658 },
659#endif
660 {
1da177e4
LT		 661 .procname = "pid_max",
662 .data = &pid_max,
663 .maxlen = sizeof (int),
664 .mode = 0644,
6d456111 665 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 666 .extra1 = &pid_max_min,
667 .extra2 = &pid_max_max,
668 },
669 {
1da177e4
LT		 670 .procname = "panic_on_oops",
671 .data = &panic_on_oops,
672 .maxlen = sizeof(int),
673 .mode = 0644,
6d456111 674 .proc_handler = proc_dointvec,
1da177e4 675 },
7ef3d2fd
JP		 676#if defined CONFIG_PRINTK
677 {
7ef3d2fd
JP		 678 .procname = "printk",
679 .data = &console_loglevel,
680 .maxlen = 4*sizeof(int),
681 .mode = 0644,
6d456111 682 .proc_handler = proc_dointvec,
7ef3d2fd 683 },
1da177e4 684 {
1da177e4 685 .procname = "printk_ratelimit",
717115e1 686 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 687 .maxlen = sizeof(int),
688 .mode = 0644,
6d456111 689 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 690 },
691 {
1da177e4 692 .procname = "printk_ratelimit_burst",
717115e1 693 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 694 .maxlen = sizeof(int),
695 .mode = 0644,
6d456111 696 .proc_handler = proc_dointvec,
1da177e4 697 },
af91322e 698 {
af91322e
DY		 699 .procname = "printk_delay",
700 .data = &printk_delay_msec,
701 .maxlen = sizeof(int),
702 .mode = 0644,
6d456111 703 .proc_handler = proc_dointvec_minmax,
af91322e
DY		 704 .extra1 = &zero,
705 .extra2 = &ten_thousand,
706 },
eaf06b24
DR		 707 {
708 .procname = "dmesg_restrict",
709 .data = &dmesg_restrict,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = proc_dointvec_minmax,
713 .extra1 = &zero,
714 .extra2 = &one,
715 },
455cd5ab
DR		 716 {
717 .procname = "kptr_restrict",
718 .data = &kptr_restrict,
719 .maxlen = sizeof(int),
720 .mode = 0644,
bfdc0b49 721 .proc_handler = proc_dmesg_restrict,
455cd5ab
DR		 722 .extra1 = &zero,
723 .extra2 = &two,
724 },
df6e61d4 725#endif
1da177e4 726 {
1da177e4
LT		 727 .procname = "ngroups_max",
728 .data = &ngroups_max,
729 .maxlen = sizeof (int),
730 .mode = 0444,
6d456111 731 .proc_handler = proc_dointvec,
1da177e4 732 },
58687acb 733#if defined(CONFIG_LOCKUP_DETECTOR)
504d7cf1 734 {
58687acb
DZ		 735 .procname = "watchdog",
736 .data = &watchdog_enabled,
504d7cf1
DZ		 737 .maxlen = sizeof (int),
738 .mode = 0644,
586692a5
MSB		 739 .proc_handler = proc_dowatchdog,
740 .extra1 = &zero,
741 .extra2 = &one,
58687acb
DZ		 742 },
743 {
744 .procname = "watchdog_thresh",
586692a5 745 .data = &watchdog_thresh,
58687acb
DZ		 746 .maxlen = sizeof(int),
747 .mode = 0644,
586692a5 748 .proc_handler = proc_dowatchdog,
58687acb
DZ		 749 .extra1 = &neg_one,
750 .extra2 = &sixty,
504d7cf1 751 },
2508ce18
DZ		 752 {
753 .procname = "softlockup_panic",
754 .data = &softlockup_panic,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec_minmax,
758 .extra1 = &zero,
759 .extra2 = &one,
760 },
5dc30558
DZ		 761 {
762 .procname = "nmi_watchdog",
763 .data = &watchdog_enabled,
764 .maxlen = sizeof (int),
765 .mode = 0644,
586692a5
MSB		 766 .proc_handler = proc_dowatchdog,
767 .extra1 = &zero,
768 .extra2 = &one,
5dc30558
DZ		 769 },
770#endif
771#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
772 {
773 .procname = "unknown_nmi_panic",
774 .data = &unknown_nmi_panic,
775 .maxlen = sizeof (int),
776 .mode = 0644,
777 .proc_handler = proc_dointvec,
778 },
504d7cf1 779#endif
1da177e4 780#if defined(CONFIG_X86)
8da5adda 781 {
8da5adda
DZ		 782 .procname = "panic_on_unrecovered_nmi",
783 .data = &panic_on_unrecovered_nmi,
784 .maxlen = sizeof(int),
785 .mode = 0644,
6d456111 786 .proc_handler = proc_dointvec,
8da5adda 787 },
5211a242 788 {
5211a242
KG		 789 .procname = "panic_on_io_nmi",
790 .data = &panic_on_io_nmi,
791 .maxlen = sizeof(int),
792 .mode = 0644,
6d456111 793 .proc_handler = proc_dointvec,
5211a242 794 },
1da177e4 795 {
1da177e4
LT		 796 .procname = "bootloader_type",
797 .data = &bootloader_type,
798 .maxlen = sizeof (int),
799 .mode = 0444,
6d456111 800 .proc_handler = proc_dointvec,
1da177e4 801 },
5031296c 802 {
5031296c
PA		 803 .procname = "bootloader_version",
804 .data = &bootloader_version,
805 .maxlen = sizeof (int),
806 .mode = 0444,
6d456111 807 .proc_handler = proc_dointvec,
5031296c 808 },
0741f4d2 809 {
0741f4d2
CE		 810 .procname = "kstack_depth_to_print",
811 .data = &kstack_depth_to_print,
812 .maxlen = sizeof(int),
813 .mode = 0644,
6d456111 814 .proc_handler = proc_dointvec,
0741f4d2 815 },
6e7c4025 816 {
6e7c4025
IM		 817 .procname = "io_delay_type",
818 .data = &io_delay_type,
819 .maxlen = sizeof(int),
820 .mode = 0644,
6d456111 821 .proc_handler = proc_dointvec,
6e7c4025 822 },
1da177e4 823#endif
7a9166e3 824#if defined(CONFIG_MMU)
1da177e4 825 {
1da177e4
LT		 826 .procname = "randomize_va_space",
827 .data = &randomize_va_space,
828 .maxlen = sizeof(int),
829 .mode = 0644,
6d456111 830 .proc_handler = proc_dointvec,
1da177e4 831 },
7a9166e3 832#endif
0152fb37 833#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5 834 {
951f22d5
MS		 835 .procname = "spin_retry",
836 .data = &spin_retry,
837 .maxlen = sizeof (int),
838 .mode = 0644,
6d456111 839 .proc_handler = proc_dointvec,
951f22d5 840 },
c255d844 841#endif
673d5b43 842#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 843 {
c255d844 844 .procname = "acpi_video_flags",
77afcf78 845 .data = &acpi_realmode_flags,
c255d844
PM		 846 .maxlen = sizeof (unsigned long),
847 .mode = 0644,
6d456111 848 .proc_handler = proc_doulongvec_minmax,
c255d844 849 },
d2b176ed
JS		 850#endif
851#ifdef CONFIG_IA64
852 {
d2b176ed
JS		 853 .procname = "ignore-unaligned-usertrap",
854 .data = &no_unaligned_warning,
855 .maxlen = sizeof (int),
856 .mode = 0644,
6d456111 857 .proc_handler = proc_dointvec,
d2b176ed 858 },
88fc241f 859 {
88fc241f
DC		 860 .procname = "unaligned-dump-stack",
861 .data = &unaligned_dump_stack,
862 .maxlen = sizeof (int),
863 .mode = 0644,
6d456111 864 .proc_handler = proc_dointvec,
88fc241f 865 },
bebfa101 866#endif
e162b39a
MSB		 867#ifdef CONFIG_DETECT_HUNG_TASK
868 {
e162b39a
MSB		 869 .procname = "hung_task_panic",
870 .data = &sysctl_hung_task_panic,
871 .maxlen = sizeof(int),
872 .mode = 0644,
6d456111 873 .proc_handler = proc_dointvec_minmax,
e162b39a
MSB		 874 .extra1 = &zero,
875 .extra2 = &one,
876 },
82a1fcb9 877 {
82a1fcb9
IM		 878 .procname = "hung_task_check_count",
879 .data = &sysctl_hung_task_check_count,
90739081 880 .maxlen = sizeof(unsigned long),
82a1fcb9 881 .mode = 0644,
6d456111 882 .proc_handler = proc_doulongvec_minmax,
82a1fcb9
IM		 883 },
884 {
82a1fcb9
IM		 885 .procname = "hung_task_timeout_secs",
886 .data = &sysctl_hung_task_timeout_secs,
90739081 887 .maxlen = sizeof(unsigned long),
82a1fcb9 888 .mode = 0644,
6d456111 889 .proc_handler = proc_dohung_task_timeout_secs,
82a1fcb9
IM		 890 },
891 {
82a1fcb9
IM		 892 .procname = "hung_task_warnings",
893 .data = &sysctl_hung_task_warnings,
90739081 894 .maxlen = sizeof(unsigned long),
82a1fcb9 895 .mode = 0644,
6d456111 896 .proc_handler = proc_doulongvec_minmax,
82a1fcb9 897 },
c4f3b63f 898#endif
bebfa101
AK		 899#ifdef CONFIG_COMPAT
900 {
bebfa101
AK		 901 .procname = "compat-log",
902 .data = &compat_log,
903 .maxlen = sizeof (int),
904 .mode = 0644,
6d456111 905 .proc_handler = proc_dointvec,
bebfa101 906 },
951f22d5 907#endif
23f78d4a
IM		 908#ifdef CONFIG_RT_MUTEXES
909 {
23f78d4a
IM		 910 .procname = "max_lock_depth",
911 .data = &max_lock_depth,
912 .maxlen = sizeof(int),
913 .mode = 0644,
6d456111 914 .proc_handler = proc_dointvec,
23f78d4a 915 },
5096add8 916#endif
10a0a8d4 917 {
10a0a8d4
JF		 918 .procname = "poweroff_cmd",
919 .data = &poweroff_cmd,
920 .maxlen = POWEROFF_CMD_PATH_LEN,
921 .mode = 0644,
6d456111 922 .proc_handler = proc_dostring,
10a0a8d4 923 },
0b77f5bf
DH		 924#ifdef CONFIG_KEYS
925 {
0b77f5bf
DH		 926 .procname = "keys",
927 .mode = 0555,
928 .child = key_sysctls,
929 },
930#endif
31a72bce
PM		 931#ifdef CONFIG_RCU_TORTURE_TEST
932 {
31a72bce
PM		 933 .procname = "rcutorture_runnable",
934 .data = &rcutorture_runnable,
935 .maxlen = sizeof(int),
936 .mode = 0644,
6d456111 937 .proc_handler = proc_dointvec,
31a72bce
PM		 938 },
939#endif
cdd6c482 940#ifdef CONFIG_PERF_EVENTS
1ccd1549 941 {
cdd6c482
IM		 942 .procname = "perf_event_paranoid",
943 .data = &sysctl_perf_event_paranoid,
944 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 945 .mode = 0644,
6d456111 946 .proc_handler = proc_dointvec,
1ccd1549 947 },
c5078f78 948 {
cdd6c482
IM		 949 .procname = "perf_event_mlock_kb",
950 .data = &sysctl_perf_event_mlock,
951 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 952 .mode = 0644,
6d456111 953 .proc_handler = proc_dointvec,
c5078f78 954 },
a78ac325 955 {
cdd6c482
IM		 956 .procname = "perf_event_max_sample_rate",
957 .data = &sysctl_perf_event_sample_rate,
958 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 959 .mode = 0644,
163ec435 960 .proc_handler = perf_proc_update_handler,
a78ac325 961 },
1ccd1549 962#endif
dfec072e
VN		 963#ifdef CONFIG_KMEMCHECK
964 {
dfec072e
VN		 965 .procname = "kmemcheck",
966 .data = &kmemcheck_enabled,
967 .maxlen = sizeof(int),
968 .mode = 0644,
6d456111 969 .proc_handler = proc_dointvec,
dfec072e
VN		 970 },
971#endif
cb684b5b 972#ifdef CONFIG_BLOCK
5e605b64 973 {
5e605b64
JA		 974 .procname = "blk_iopoll",
975 .data = &blk_iopoll_enabled,
976 .maxlen = sizeof(int),
977 .mode = 0644,
6d456111 978 .proc_handler = proc_dointvec,
5e605b64 979 },
cb684b5b 980#endif
6fce56ec 981 { }
1da177e4
LT		 982};
983
d8217f07 984static struct ctl_table vm_table[] = {
1da177e4 985 {
1da177e4
LT		 986 .procname = "overcommit_memory",
987 .data = &sysctl_overcommit_memory,
988 .maxlen = sizeof(sysctl_overcommit_memory),
989 .mode = 0644,
cb16e95f
PH		 990 .proc_handler = proc_dointvec_minmax,
991 .extra1 = &zero,
992 .extra2 = &two,
1da177e4 993 },
fadd8fbd 994 {
fadd8fbd
KH		 995 .procname = "panic_on_oom",
996 .data = &sysctl_panic_on_oom,
997 .maxlen = sizeof(sysctl_panic_on_oom),
998 .mode = 0644,
cb16e95f
PH		 999 .proc_handler = proc_dointvec_minmax,
1000 .extra1 = &zero,
1001 .extra2 = &two,
fadd8fbd 1002 },
fe071d7e 1003 {
fe071d7e
DR		 1004 .procname = "oom_kill_allocating_task",
1005 .data = &sysctl_oom_kill_allocating_task,
1006 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1007 .mode = 0644,
6d456111 1008 .proc_handler = proc_dointvec,
fe071d7e 1009 },
fef1bdd6 1010 {
fef1bdd6
DR		 1011 .procname = "oom_dump_tasks",
1012 .data = &sysctl_oom_dump_tasks,
1013 .maxlen = sizeof(sysctl_oom_dump_tasks),
1014 .mode = 0644,
6d456111 1015 .proc_handler = proc_dointvec,
fef1bdd6 1016 },
1da177e4 1017 {
1da177e4
LT		 1018 .procname = "overcommit_ratio",
1019 .data = &sysctl_overcommit_ratio,
1020 .maxlen = sizeof(sysctl_overcommit_ratio),
1021 .mode = 0644,
6d456111 1022 .proc_handler = proc_dointvec,
1da177e4
LT		 1023 },
1024 {
1da177e4
LT		 1025 .procname = "page-cluster",
1026 .data = &page_cluster,
1027 .maxlen = sizeof(int),
1028 .mode = 0644,
cb16e95f
PH		 1029 .proc_handler = proc_dointvec_minmax,
1030 .extra1 = &zero,
1da177e4
LT		 1031 },
1032 {
1da177e4
LT		 1033 .procname = "dirty_background_ratio",
1034 .data = &dirty_background_ratio,
1035 .maxlen = sizeof(dirty_background_ratio),
1036 .mode = 0644,
6d456111 1037 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1038 .extra1 = &zero,
1039 .extra2 = &one_hundred,
1040 },
2da02997 1041 {
2da02997
DR		 1042 .procname = "dirty_background_bytes",
1043 .data = &dirty_background_bytes,
1044 .maxlen = sizeof(dirty_background_bytes),
1045 .mode = 0644,
6d456111 1046 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1047 .extra1 = &one_ul,
2da02997 1048 },
1da177e4 1049 {
1da177e4
LT		 1050 .procname = "dirty_ratio",
1051 .data = &vm_dirty_ratio,
1052 .maxlen = sizeof(vm_dirty_ratio),
1053 .mode = 0644,
6d456111 1054 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1055 .extra1 = &zero,
1056 .extra2 = &one_hundred,
1057 },
2da02997 1058 {
2da02997
DR		 1059 .procname = "dirty_bytes",
1060 .data = &vm_dirty_bytes,
1061 .maxlen = sizeof(vm_dirty_bytes),
1062 .mode = 0644,
6d456111 1063 .proc_handler = dirty_bytes_handler,
9e4a5bda 1064 .extra1 = &dirty_bytes_min,
2da02997 1065 },
1da177e4 1066 {
1da177e4 1067 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1068 .data = &dirty_writeback_interval,
1069 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1070 .mode = 0644,
6d456111 1071 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1072 },
1073 {
1da177e4 1074 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1075 .data = &dirty_expire_interval,
1076 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1077 .mode = 0644,
cb16e95f
PH		 1078 .proc_handler = proc_dointvec_minmax,
1079 .extra1 = &zero,
1da177e4
LT		 1080 },
1081 {
1da177e4
LT		 1082 .procname = "nr_pdflush_threads",
1083 .data = &nr_pdflush_threads,
1084 .maxlen = sizeof nr_pdflush_threads,
1085 .mode = 0444 /* read-only*/,
6d456111 1086 .proc_handler = proc_dointvec,
1da177e4
LT		 1087 },
1088 {
1da177e4
LT		 1089 .procname = "swappiness",
1090 .data = &vm_swappiness,
1091 .maxlen = sizeof(vm_swappiness),
1092 .mode = 0644,
6d456111 1093 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1094 .extra1 = &zero,
1095 .extra2 = &one_hundred,
1096 },
1097#ifdef CONFIG_HUGETLB_PAGE
06808b08 1098 {
1da177e4 1099 .procname = "nr_hugepages",
e5ff2159 1100 .data = NULL,
1da177e4
LT		 1101 .maxlen = sizeof(unsigned long),
1102 .mode = 0644,
6d456111 1103 .proc_handler = hugetlb_sysctl_handler,
1da177e4
LT		 1104 .extra1 = (void *)&hugetlb_zero,
1105 .extra2 = (void *)&hugetlb_infinity,
06808b08
LS		 1106 },
1107#ifdef CONFIG_NUMA
1108 {
1109 .procname = "nr_hugepages_mempolicy",
1110 .data = NULL,
1111 .maxlen = sizeof(unsigned long),
1112 .mode = 0644,
1113 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1114 .extra1 = (void *)&hugetlb_zero,
1115 .extra2 = (void *)&hugetlb_infinity,
1116 },
1117#endif
1da177e4 1118 {
1da177e4
LT		 1119 .procname = "hugetlb_shm_group",
1120 .data = &sysctl_hugetlb_shm_group,
1121 .maxlen = sizeof(gid_t),
1122 .mode = 0644,
6d456111 1123 .proc_handler = proc_dointvec,
1da177e4 1124 },
396faf03 1125 {
396faf03
MG		 1126 .procname = "hugepages_treat_as_movable",
1127 .data = &hugepages_treat_as_movable,
1128 .maxlen = sizeof(int),
1129 .mode = 0644,
6d456111 1130 .proc_handler = hugetlb_treat_movable_handler,
396faf03 1131 },
d1c3fb1f 1132 {
d1c3fb1f 1133 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1134 .data = NULL,
1135 .maxlen = sizeof(unsigned long),
d1c3fb1f 1136 .mode = 0644,
6d456111 1137 .proc_handler = hugetlb_overcommit_handler,
e5ff2159
AK		 1138 .extra1 = (void *)&hugetlb_zero,
1139 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1140 },
1da177e4
LT		 1141#endif
1142 {
1da177e4
LT		 1143 .procname = "lowmem_reserve_ratio",
1144 .data = &sysctl_lowmem_reserve_ratio,
1145 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1146 .mode = 0644,
6d456111 1147 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1148 },
9d0243bc 1149 {
9d0243bc
AM		 1150 .procname = "drop_caches",
1151 .data = &sysctl_drop_caches,
1152 .maxlen = sizeof(int),
1153 .mode = 0644,
1154 .proc_handler = drop_caches_sysctl_handler,
cb16e95f
PH		 1155 .extra1 = &one,
1156 .extra2 = &three,
9d0243bc 1157 },
76ab0f53
MG		 1158#ifdef CONFIG_COMPACTION
1159 {
1160 .procname = "compact_memory",
1161 .data = &sysctl_compact_memory,
1162 .maxlen = sizeof(int),
1163 .mode = 0200,
1164 .proc_handler = sysctl_compaction_handler,
1165 },
5e771905
MG		 1166 {
1167 .procname = "extfrag_threshold",
1168 .data = &sysctl_extfrag_threshold,
1169 .maxlen = sizeof(int),
1170 .mode = 0644,
1171 .proc_handler = sysctl_extfrag_handler,
1172 .extra1 = &min_extfrag_threshold,
1173 .extra2 = &max_extfrag_threshold,
1174 },
1175
76ab0f53 1176#endif /* CONFIG_COMPACTION */
1da177e4 1177 {
1da177e4
LT		 1178 .procname = "min_free_kbytes",
1179 .data = &min_free_kbytes,
1180 .maxlen = sizeof(min_free_kbytes),
1181 .mode = 0644,
6d456111 1182 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1183 .extra1 = &zero,
1184 },
8ad4b1fb 1185 {
8ad4b1fb
RS		 1186 .procname = "percpu_pagelist_fraction",
1187 .data = &percpu_pagelist_fraction,
1188 .maxlen = sizeof(percpu_pagelist_fraction),
1189 .mode = 0644,
6d456111 1190 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
8ad4b1fb
RS		 1191 .extra1 = &min_percpu_pagelist_fract,
1192 },
1da177e4
LT		 1193#ifdef CONFIG_MMU
1194 {
1da177e4
LT		 1195 .procname = "max_map_count",
1196 .data = &sysctl_max_map_count,
1197 .maxlen = sizeof(sysctl_max_map_count),
1198 .mode = 0644,
3e26120c 1199 .proc_handler = proc_dointvec_minmax,
70da2340 1200 .extra1 = &zero,
1da177e4 1201 },
dd8632a1
PM		 1202#else
1203 {
dd8632a1
PM		 1204 .procname = "nr_trim_pages",
1205 .data = &sysctl_nr_trim_pages,
1206 .maxlen = sizeof(sysctl_nr_trim_pages),
1207 .mode = 0644,
6d456111 1208 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1209 .extra1 = &zero,
1210 },
1da177e4
LT		 1211#endif
1212 {
1da177e4
LT		 1213 .procname = "laptop_mode",
1214 .data = &laptop_mode,
1215 .maxlen = sizeof(laptop_mode),
1216 .mode = 0644,
6d456111 1217 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1218 },
1219 {
1da177e4
LT		 1220 .procname = "block_dump",
1221 .data = &block_dump,
1222 .maxlen = sizeof(block_dump),
1223 .mode = 0644,
6d456111 1224 .proc_handler = proc_dointvec,
1da177e4
LT		 1225 .extra1 = &zero,
1226 },
1227 {
1da177e4
LT		 1228 .procname = "vfs_cache_pressure",
1229 .data = &sysctl_vfs_cache_pressure,
1230 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1231 .mode = 0644,
6d456111 1232 .proc_handler = proc_dointvec,
1da177e4
LT		 1233 .extra1 = &zero,
1234 },
1235#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1236 {
1da177e4
LT		 1237 .procname = "legacy_va_layout",
1238 .data = &sysctl_legacy_va_layout,
1239 .maxlen = sizeof(sysctl_legacy_va_layout),
1240 .mode = 0644,
6d456111 1241 .proc_handler = proc_dointvec,
1da177e4
LT		 1242 .extra1 = &zero,
1243 },
1244#endif
1743660b
CL		 1245#ifdef CONFIG_NUMA
1246 {
1743660b
CL		 1247 .procname = "zone_reclaim_mode",
1248 .data = &zone_reclaim_mode,
1249 .maxlen = sizeof(zone_reclaim_mode),
1250 .mode = 0644,
6d456111 1251 .proc_handler = proc_dointvec,
c84db23c 1252 .extra1 = &zero,
1743660b 1253 },
9614634f 1254 {
9614634f
CL		 1255 .procname = "min_unmapped_ratio",
1256 .data = &sysctl_min_unmapped_ratio,
1257 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1258 .mode = 0644,
6d456111 1259 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1260 .extra1 = &zero,
1261 .extra2 = &one_hundred,
1262 },
0ff38490 1263 {
0ff38490
CL		 1264 .procname = "min_slab_ratio",
1265 .data = &sysctl_min_slab_ratio,
1266 .maxlen = sizeof(sysctl_min_slab_ratio),
1267 .mode = 0644,
6d456111 1268 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1269 .extra1 = &zero,
1270 .extra2 = &one_hundred,
1271 },
e6e5494c 1272#endif
77461ab3
CL		 1273#ifdef CONFIG_SMP
1274 {
77461ab3
CL		 1275 .procname = "stat_interval",
1276 .data = &sysctl_stat_interval,
1277 .maxlen = sizeof(sysctl_stat_interval),
1278 .mode = 0644,
6d456111 1279 .proc_handler = proc_dointvec_jiffies,
77461ab3
CL		 1280 },
1281#endif
6e141546 1282#ifdef CONFIG_MMU
ed032189 1283 {
ed032189 1284 .procname = "mmap_min_addr",
788084ab
EP		 1285 .data = &dac_mmap_min_addr,
1286 .maxlen = sizeof(unsigned long),
ed032189 1287 .mode = 0644,
6d456111 1288 .proc_handler = mmap_min_addr_handler,
ed032189 1289 },
6e141546 1290#endif
f0c0b2b8
KH		 1291#ifdef CONFIG_NUMA
1292 {
f0c0b2b8
KH		 1293 .procname = "numa_zonelist_order",
1294 .data = &numa_zonelist_order,
1295 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1296 .mode = 0644,
6d456111 1297 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1298 },
1299#endif
2b8232ce 1300#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1301 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1302 {
e6e5494c
IM		 1303 .procname = "vdso_enabled",
1304 .data = &vdso_enabled,
1305 .maxlen = sizeof(vdso_enabled),
1306 .mode = 0644,
6d456111 1307 .proc_handler = proc_dointvec,
e6e5494c
IM		 1308 .extra1 = &zero,
1309 },
1da177e4 1310#endif
195cf453
BG		 1311#ifdef CONFIG_HIGHMEM
1312 {
195cf453
BG		 1313 .procname = "highmem_is_dirtyable",
1314 .data = &vm_highmem_is_dirtyable,
1315 .maxlen = sizeof(vm_highmem_is_dirtyable),
1316 .mode = 0644,
6d456111 1317 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1318 .extra1 = &zero,
1319 .extra2 = &one,
1320 },
1321#endif
4be6f6bb 1322 {
4be6f6bb
PZ		 1323 .procname = "scan_unevictable_pages",
1324 .data = &scan_unevictable_pages,
1325 .maxlen = sizeof(scan_unevictable_pages),
1326 .mode = 0644,
6d456111 1327 .proc_handler = scan_unevictable_handler,
4be6f6bb 1328 },
6a46079c
AK		 1329#ifdef CONFIG_MEMORY_FAILURE
1330 {
6a46079c
AK		 1331 .procname = "memory_failure_early_kill",
1332 .data = &sysctl_memory_failure_early_kill,
1333 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1334 .mode = 0644,
6d456111 1335 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1336 .extra1 = &zero,
1337 .extra2 = &one,
1338 },
1339 {
6a46079c
AK		 1340 .procname = "memory_failure_recovery",
1341 .data = &sysctl_memory_failure_recovery,
1342 .maxlen = sizeof(sysctl_memory_failure_recovery),
1343 .mode = 0644,
6d456111 1344 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1345 .extra1 = &zero,
1346 .extra2 = &one,
1347 },
1348#endif
6fce56ec 1349 { }
1da177e4
LT		 1350};
1351
2abc26fc 1352#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1353static struct ctl_table binfmt_misc_table[] = {
6fce56ec 1354 { }
2abc26fc
EB		 1355};
1356#endif
1357
d8217f07 1358static struct ctl_table fs_table[] = {
1da177e4 1359 {
1da177e4
LT		 1360 .procname = "inode-nr",
1361 .data = &inodes_stat,
1362 .maxlen = 2*sizeof(int),
1363 .mode = 0444,
cffbc8aa 1364 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1365 },
1366 {
1da177e4
LT		 1367 .procname = "inode-state",
1368 .data = &inodes_stat,
1369 .maxlen = 7*sizeof(int),
1370 .mode = 0444,
cffbc8aa 1371 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1372 },
1373 {
1da177e4
LT		 1374 .procname = "file-nr",
1375 .data = &files_stat,
518de9b3 1376 .maxlen = sizeof(files_stat),
1da177e4 1377 .mode = 0444,
6d456111 1378 .proc_handler = proc_nr_files,
1da177e4
LT		 1379 },
1380 {
1da177e4
LT		 1381 .procname = "file-max",
1382 .data = &files_stat.max_files,
518de9b3 1383 .maxlen = sizeof(files_stat.max_files),
1da177e4 1384 .mode = 0644,
518de9b3 1385 .proc_handler = proc_doulongvec_minmax,
1da177e4 1386 },
9cfe015a 1387 {
9cfe015a
ED		 1388 .procname = "nr_open",
1389 .data = &sysctl_nr_open,
1390 .maxlen = sizeof(int),
1391 .mode = 0644,
6d456111 1392 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1393 .extra1 = &sysctl_nr_open_min,
1394 .extra2 = &sysctl_nr_open_max,
9cfe015a 1395 },
1da177e4 1396 {
1da177e4
LT		 1397 .procname = "dentry-state",
1398 .data = &dentry_stat,
1399 .maxlen = 6*sizeof(int),
1400 .mode = 0444,
312d3ca8 1401 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1402 },
1403 {
1da177e4
LT		 1404 .procname = "overflowuid",
1405 .data = &fs_overflowuid,
1406 .maxlen = sizeof(int),
1407 .mode = 0644,
6d456111 1408 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1409 .extra1 = &minolduid,
1410 .extra2 = &maxolduid,
1411 },
1412 {
1da177e4
LT		 1413 .procname = "overflowgid",
1414 .data = &fs_overflowgid,
1415 .maxlen = sizeof(int),
1416 .mode = 0644,
6d456111 1417 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1418 .extra1 = &minolduid,
1419 .extra2 = &maxolduid,
1420 },
bfcd17a6 1421#ifdef CONFIG_FILE_LOCKING
1da177e4 1422 {
1da177e4
LT		 1423 .procname = "leases-enable",
1424 .data = &leases_enable,
1425 .maxlen = sizeof(int),
1426 .mode = 0644,
6d456111 1427 .proc_handler = proc_dointvec,
1da177e4 1428 },
bfcd17a6 1429#endif
1da177e4
LT		 1430#ifdef CONFIG_DNOTIFY
1431 {
1da177e4
LT		 1432 .procname = "dir-notify-enable",
1433 .data = &dir_notify_enable,
1434 .maxlen = sizeof(int),
1435 .mode = 0644,
6d456111 1436 .proc_handler = proc_dointvec,
1da177e4
LT		 1437 },
1438#endif
1439#ifdef CONFIG_MMU
bfcd17a6 1440#ifdef CONFIG_FILE_LOCKING
1da177e4 1441 {
1da177e4
LT		 1442 .procname = "lease-break-time",
1443 .data = &lease_break_time,
1444 .maxlen = sizeof(int),
1445 .mode = 0644,
6d456111 1446 .proc_handler = proc_dointvec,
1da177e4 1447 },
bfcd17a6 1448#endif
ebf3f09c 1449#ifdef CONFIG_AIO
1da177e4 1450 {
1da177e4
LT		 1451 .procname = "aio-nr",
1452 .data = &aio_nr,
1453 .maxlen = sizeof(aio_nr),
1454 .mode = 0444,
6d456111 1455 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1456 },
1457 {
1da177e4
LT		 1458 .procname = "aio-max-nr",
1459 .data = &aio_max_nr,
1460 .maxlen = sizeof(aio_max_nr),
1461 .mode = 0644,
6d456111 1462 .proc_handler = proc_doulongvec_minmax,
1da177e4 1463 },
ebf3f09c 1464#endif /* CONFIG_AIO */
2d9048e2 1465#ifdef CONFIG_INOTIFY_USER
0399cb08 1466 {
0399cb08
RL		 1467 .procname = "inotify",
1468 .mode = 0555,
1469 .child = inotify_table,
1470 },
1471#endif
7ef9964e
DL		 1472#ifdef CONFIG_EPOLL
1473 {
1474 .procname = "epoll",
1475 .mode = 0555,
1476 .child = epoll_table,
1477 },
1478#endif
1da177e4 1479#endif
d6e71144 1480 {
d6e71144
AC		 1481 .procname = "suid_dumpable",
1482 .data = &suid_dumpable,
1483 .maxlen = sizeof(int),
1484 .mode = 0644,
6d456111 1485 .proc_handler = proc_dointvec_minmax,
8e654fba
MW		 1486 .extra1 = &zero,
1487 .extra2 = &two,
d6e71144 1488 },
2abc26fc
EB		 1489#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1490 {
2abc26fc
EB		 1491 .procname = "binfmt_misc",
1492 .mode = 0555,
1493 .child = binfmt_misc_table,
1494 },
1495#endif
b492e95b 1496 {
ff9da691
JA		 1497 .procname = "pipe-max-size",
1498 .data = &pipe_max_size,
b492e95b
JA		 1499 .maxlen = sizeof(int),
1500 .mode = 0644,
ff9da691
JA		 1501 .proc_handler = &pipe_proc_fn,
1502 .extra1 = &pipe_min_size,
b492e95b 1503 },
6fce56ec 1504 { }
1da177e4
LT		 1505};
1506
d8217f07 1507static struct ctl_table debug_table[] = {
ab3c68ee 1508#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
571d76ac 1509 defined(CONFIG_S390) || defined(CONFIG_TILE)
abd4f750 1510 {
abd4f750
MAS		 1511 .procname = "exception-trace",
1512 .data = &show_unhandled_signals,
1513 .maxlen = sizeof(int),
1514 .mode = 0644,
1515 .proc_handler = proc_dointvec
1516 },
b2be84df
MH		 1517#endif
1518#if defined(CONFIG_OPTPROBES)
1519 {
1520 .procname = "kprobes-optimization",
1521 .data = &sysctl_kprobes_optimization,
1522 .maxlen = sizeof(int),
1523 .mode = 0644,
1524 .proc_handler = proc_kprobes_optimization_handler,
1525 .extra1 = &zero,
1526 .extra2 = &one,
1527 },
abd4f750 1528#endif
6fce56ec 1529 { }
1da177e4
LT		 1530};
1531
d8217f07 1532static struct ctl_table dev_table[] = {
6fce56ec 1533 { }
0eeca283 1534};
1da177e4 1535
330d57fb
AV		 1536static DEFINE_SPINLOCK(sysctl_lock);
1537
1538/* called under sysctl_lock */
1539static int use_table(struct ctl_table_header *p)
1540{
1541 if (unlikely(p->unregistering))
1542 return 0;
1543 p->used++;
1544 return 1;
1545}
1546
1547/* called under sysctl_lock */
1548static void unuse_table(struct ctl_table_header *p)
1549{
1550 if (!--p->used)
1551 if (unlikely(p->unregistering))
1552 complete(p->unregistering);
1553}
1554
1555/* called under sysctl_lock, will reacquire if has to wait */
1556static void start_unregistering(struct ctl_table_header *p)
1557{
1558 /*
1559 * if p->used is 0, nobody will ever touch that entry again;
1560 * we'll eliminate all paths to it before dropping sysctl_lock
1561 */
1562 if (unlikely(p->used)) {
1563 struct completion wait;
1564 init_completion(&wait);
1565 p->unregistering = &wait;
1566 spin_unlock(&sysctl_lock);
1567 wait_for_completion(&wait);
1568 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1569 } else {
1570 /* anything non-NULL; we'll never dereference it */
1571 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1572 }
1573 /*
1574 * do not remove from the list until nobody holds it; walking the
1575 * list in do_sysctl() relies on that.
1576 */
1577 list_del_init(&p->ctl_entry);
1578}
1579
f7e6ced4
AV		 1580void sysctl_head_get(struct ctl_table_header *head)
1581{
1582 spin_lock(&sysctl_lock);
1583 head->count++;
1584 spin_unlock(&sysctl_lock);
1585}
1586
dfef6dcd
AV		 1587static void free_head(struct rcu_head *rcu)
1588{
1589 kfree(container_of(rcu, struct ctl_table_header, rcu));
1590}
1591
f7e6ced4
AV		 1592void sysctl_head_put(struct ctl_table_header *head)
1593{
1594 spin_lock(&sysctl_lock);
1595 if (!--head->count)
dfef6dcd 1596 call_rcu(&head->rcu, free_head);
f7e6ced4
AV		 1597 spin_unlock(&sysctl_lock);
1598}
1599
1600struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1601{
1602 if (!head)
1603 BUG();
1604 spin_lock(&sysctl_lock);
1605 if (!use_table(head))
1606 head = ERR_PTR(-ENOENT);
1607 spin_unlock(&sysctl_lock);
1608 return head;
1609}
1610
805b5d5e
EB		 1611void sysctl_head_finish(struct ctl_table_header *head)
1612{
1613 if (!head)
1614 return;
1615 spin_lock(&sysctl_lock);
1616 unuse_table(head);
1617 spin_unlock(&sysctl_lock);
1618}
1619
73455092
AV		 1620static struct ctl_table_set *
1621lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1622{
1623 struct ctl_table_set *set = &root->default_set;
1624 if (root->lookup)
1625 set = root->lookup(root, namespaces);
1626 return set;
1627}
1628
e51b6ba0
EB		 1629static struct list_head *
1630lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1631{
73455092
AV		 1632 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1633 return &set->list;
e51b6ba0
EB		 1634}
1635
1636struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1637 struct ctl_table_header *prev)
1638{
1639 struct ctl_table_root *root;
1640 struct list_head *header_list;
805b5d5e
EB		 1641 struct ctl_table_header *head;
1642 struct list_head *tmp;
e51b6ba0 1643
805b5d5e
EB		 1644 spin_lock(&sysctl_lock);
1645 if (prev) {
e51b6ba0 1646 head = prev;
805b5d5e
EB		 1647 tmp = &prev->ctl_entry;
1648 unuse_table(prev);
1649 goto next;
1650 }
1651 tmp = &root_table_header.ctl_entry;
1652 for (;;) {
1653 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1654
1655 if (!use_table(head))
1656 goto next;
1657 spin_unlock(&sysctl_lock);
1658 return head;
1659 next:
e51b6ba0 1660 root = head->root;
805b5d5e 1661 tmp = tmp->next;
e51b6ba0
EB		 1662 header_list = lookup_header_list(root, namespaces);
1663 if (tmp != header_list)
1664 continue;
1665
1666 do {
1667 root = list_entry(root->root_list.next,
1668 struct ctl_table_root, root_list);
1669 if (root == &sysctl_table_root)
1670 goto out;
1671 header_list = lookup_header_list(root, namespaces);
1672 } while (list_empty(header_list));
1673 tmp = header_list->next;
805b5d5e 1674 }
e51b6ba0 1675out:
805b5d5e
EB		 1676 spin_unlock(&sysctl_lock);
1677 return NULL;
1678}
1679
e51b6ba0
EB		 1680struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1681{
1682 return __sysctl_head_next(current->nsproxy, prev);
1683}
1684
1685void register_sysctl_root(struct ctl_table_root *root)
1686{
1687 spin_lock(&sysctl_lock);
1688 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1689 spin_unlock(&sysctl_lock);
1690}
1691
1da177e4 1692/*
1ff007eb 1693 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1694 * some sysctl variables are readonly even to root.
1695 */
1696
1697static int test_perm(int mode, int op)
1698{
76aac0e9 1699 if (!current_euid())
1da177e4
LT		 1700 mode >>= 6;
1701 else if (in_egroup_p(0))
1702 mode >>= 3;
e6305c43 1703 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1704 return 0;
1705 return -EACCES;
1706}
1707
d7321cd6 1708int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4 1709{
d7321cd6
PE		 1710 int mode;
1711
d7321cd6
PE		 1712 if (root->permissions)
1713 mode = root->permissions(root, current->nsproxy, table);
1714 else
1715 mode = table->mode;
1716
1717 return test_perm(mode, op);
1da177e4
LT		 1718}
1719
d912b0cc
EB		 1720static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1721{
2315ffa0 1722 for (; table->procname; table++) {
d912b0cc
EB		 1723 table->parent = parent;
1724 if (table->child)
1725 sysctl_set_parent(table, table->child);
1726 }
1727}
1728
1729static __init int sysctl_init(void)
1730{
1731 sysctl_set_parent(NULL, root_table);
88f458e4 1732#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
b3bd3de6 1733 sysctl_check_table(current->nsproxy, root_table);
88f458e4 1734#endif
d912b0cc
EB		 1735 return 0;
1736}
1737
1738core_initcall(sysctl_init);
1739
bfbcf034
AV		 1740static struct ctl_table *is_branch_in(struct ctl_table *branch,
1741 struct ctl_table *table)
ae7edecc
AV		 1742{
1743 struct ctl_table *p;
1744 const char *s = branch->procname;
1745
1746 /* branch should have named subdirectory as its first element */
1747 if (!s || !branch->child)
bfbcf034 1748 return NULL;
ae7edecc
AV		 1749
1750 /* ... and nothing else */
2315ffa0 1751 if (branch[1].procname)
bfbcf034 1752 return NULL;
ae7edecc
AV		 1753
1754 /* table should contain subdirectory with the same name */
2315ffa0 1755 for (p = table; p->procname; p++) {
ae7edecc
AV		 1756 if (!p->child)
1757 continue;
1758 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1759 return p;
ae7edecc 1760 }
bfbcf034 1761 return NULL;
ae7edecc
AV		 1762}
1763
1764/* see if attaching q to p would be an improvement */
1765static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1766{
1767 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1768 struct ctl_table *next;
ae7edecc
AV		 1769 int is_better = 0;
1770 int not_in_parent = !p->attached_by;
1771
bfbcf034 1772 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1773 if (by == q->attached_by)
1774 is_better = 1;
1775 if (to == p->attached_by)
1776 not_in_parent = 1;
1777 by = by->child;
bfbcf034 1778 to = next->child;
ae7edecc
AV		 1779 }
1780
1781 if (is_better && not_in_parent) {
1782 q->attached_by = by;
1783 q->attached_to = to;
1784 q->parent = p;
1785 }
1786}
1787
1da177e4 1788/**
e51b6ba0
EB		 1789 * __register_sysctl_paths - register a sysctl hierarchy
1790 * @root: List of sysctl headers to register on
1791 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1792 * @path: The path to the directory the sysctl table is in.
1da177e4 1793 * @table: the top-level table structure
1da177e4
LT		 1794 *
1795 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1796 * array. A completely 0 filled entry terminates the table.
1da177e4 1797 *
d8217f07 1798 * The members of the &struct ctl_table structure are used as follows:
1da177e4 1799 *
1da177e4
LT		 1800 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1801 * enter a sysctl file
1802 *
1803 * data - a pointer to data for use by proc_handler
1804 *
1805 * maxlen - the maximum size in bytes of the data
1806 *
1807 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1808 *
1809 * child - a pointer to the child sysctl table if this entry is a directory, or
1810 * %NULL.
1811 *
1812 * proc_handler - the text handler routine (described below)
1813 *
1da177e4
LT		 1814 * de - for internal use by the sysctl routines
1815 *
1816 * extra1, extra2 - extra pointers usable by the proc handler routines
1817 *
1818 * Leaf nodes in the sysctl tree will be represented by a single file
1819 * under /proc; non-leaf nodes will be represented by directories.
1820 *
1821 * sysctl(2) can automatically manage read and write requests through
1822 * the sysctl table. The data and maxlen fields of the ctl_table
1823 * struct enable minimal validation of the values being written to be
1824 * performed, and the mode field allows minimal authentication.
1825 *
1da177e4
LT		 1826 * There must be a proc_handler routine for any terminal nodes
1827 * mirrored under /proc/sys (non-terminals are handled by a built-in
1828 * directory handler). Several default handlers are available to
1829 * cover common cases -
1830 *
1831 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1832 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1833 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1834 *
1835 * It is the handler's job to read the input buffer from user memory
1836 * and process it. The handler should return 0 on success.
1837 *
1838 * This routine returns %NULL on a failure to register, and a pointer
1839 * to the table header on success.
1840 */
e51b6ba0
EB		 1841struct ctl_table_header *__register_sysctl_paths(
1842 struct ctl_table_root *root,
1843 struct nsproxy *namespaces,
1844 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1845{
29e796fd
EB		 1846 struct ctl_table_header *header;
1847 struct ctl_table *new, **prevp;
1848 unsigned int n, npath;
ae7edecc 1849 struct ctl_table_set *set;
29e796fd
EB		 1850
1851 /* Count the path components */
2315ffa0 1852 for (npath = 0; path[npath].procname; ++npath)
29e796fd
EB		 1853 ;
1854
1855 /*
1856 * For each path component, allocate a 2-element ctl_table array.
1857 * The first array element will be filled with the sysctl entry
2315ffa0 1858 * for this, the second will be the sentinel (procname == 0).
29e796fd
EB		 1859 *
1860 * We allocate everything in one go so that we don't have to
1861 * worry about freeing additional memory in unregister_sysctl_table.
1862 */
1863 header = kzalloc(sizeof(struct ctl_table_header) +
1864 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1865 if (!header)
1da177e4 1866 return NULL;
29e796fd
EB		 1867
1868 new = (struct ctl_table *) (header + 1);
1869
1870 /* Now connect the dots */
1871 prevp = &header->ctl_table;
1872 for (n = 0; n < npath; ++n, ++path) {
1873 /* Copy the procname */
1874 new->procname = path->procname;
29e796fd
EB		 1875 new->mode = 0555;
1876
1877 *prevp = new;
1878 prevp = &new->child;
1879
1880 new += 2;
1881 }
1882 *prevp = table;
23eb06de 1883 header->ctl_table_arg = table;
29e796fd
EB		 1884
1885 INIT_LIST_HEAD(&header->ctl_entry);
1886 header->used = 0;
1887 header->unregistering = NULL;
e51b6ba0 1888 header->root = root;
29e796fd 1889 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1890 header->count = 1;
88f458e4 1891#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1892 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1893 kfree(header);
fc6cd25b
EB		 1894 return NULL;
1895 }
88f458e4 1896#endif
330d57fb 1897 spin_lock(&sysctl_lock);
73455092 1898 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 1899 header->attached_by = header->ctl_table;
1900 header->attached_to = root_table;
1901 header->parent = &root_table_header;
1902 for (set = header->set; set; set = set->parent) {
1903 struct ctl_table_header *p;
1904 list_for_each_entry(p, &set->list, ctl_entry) {
1905 if (p->unregistering)
1906 continue;
1907 try_attach(p, header);
1908 }
1909 }
1910 header->parent->count++;
73455092 1911 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 1912 spin_unlock(&sysctl_lock);
29e796fd
EB		 1913
1914 return header;
1915}
1916
e51b6ba0
EB		 1917/**
1918 * register_sysctl_table_path - register a sysctl table hierarchy
1919 * @path: The path to the directory the sysctl table is in.
1920 * @table: the top-level table structure
1921 *
1922 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1923 * array. A completely 0 filled entry terminates the table.
1924 *
1925 * See __register_sysctl_paths for more details.
1926 */
1927struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1928 struct ctl_table *table)
1929{
1930 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1931 path, table);
1932}
1933
29e796fd
EB		 1934/**
1935 * register_sysctl_table - register a sysctl table hierarchy
1936 * @table: the top-level table structure
1937 *
1938 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1939 * array. A completely 0 filled entry terminates the table.
1940 *
1941 * See register_sysctl_paths for more details.
1942 */
1943struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1944{
1945 static const struct ctl_path null_path[] = { {} };
1946
1947 return register_sysctl_paths(null_path, table);
1da177e4
LT		 1948}
1949
1950/**
1951 * unregister_sysctl_table - unregister a sysctl table hierarchy
1952 * @header: the header returned from register_sysctl_table
1953 *
1954 * Unregisters the sysctl table and all children. proc entries may not
1955 * actually be removed until they are no longer used by anyone.
1956 */
1957void unregister_sysctl_table(struct ctl_table_header * header)
1958{
330d57fb 1959 might_sleep();
f1dad166
PE		 1960
1961 if (header == NULL)
1962 return;
1963
330d57fb
AV		 1964 spin_lock(&sysctl_lock);
1965 start_unregistering(header);
ae7edecc
AV		 1966 if (!--header->parent->count) {
1967 WARN_ON(1);
dfef6dcd 1968 call_rcu(&header->parent->rcu, free_head);
ae7edecc 1969 }
f7e6ced4 1970 if (!--header->count)
dfef6dcd 1971 call_rcu(&header->rcu, free_head);
330d57fb 1972 spin_unlock(&sysctl_lock);
1da177e4
LT		 1973}
1974
9043476f
AV		 1975int sysctl_is_seen(struct ctl_table_header *p)
1976{
1977 struct ctl_table_set *set = p->set;
1978 int res;
1979 spin_lock(&sysctl_lock);
1980 if (p->unregistering)
1981 res = 0;
1982 else if (!set->is_seen)
1983 res = 1;
1984 else
1985 res = set->is_seen(set);
1986 spin_unlock(&sysctl_lock);
1987 return res;
1988}
1989
73455092
AV		 1990void setup_sysctl_set(struct ctl_table_set *p,
1991 struct ctl_table_set *parent,
1992 int (*is_seen)(struct ctl_table_set *))
1993{
1994 INIT_LIST_HEAD(&p->list);
1995 p->parent = parent ? parent : &sysctl_table_root.default_set;
1996 p->is_seen = is_seen;
1997}
1998
b89a8171 1999#else /* !CONFIG_SYSCTL */
d8217f07 2000struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2001{
2002 return NULL;
2003}
2004
29e796fd
EB		 2005struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2006 struct ctl_table *table)
2007{
2008 return NULL;
2009}
2010
b89a8171
EB		 2011void unregister_sysctl_table(struct ctl_table_header * table)
2012{
2013}
2014
73455092
AV		 2015void setup_sysctl_set(struct ctl_table_set *p,
2016 struct ctl_table_set *parent,
2017 int (*is_seen)(struct ctl_table_set *))
2018{
2019}
2020
f7e6ced4
AV		 2021void sysctl_head_put(struct ctl_table_header *head)
2022{
2023}
2024
b89a8171
EB		 2025#endif /* CONFIG_SYSCTL */
2026
1da177e4
LT		 2027/*
2028 * /proc/sys support
2029 */
2030
b89a8171 2031#ifdef CONFIG_PROC_SYSCTL
1da177e4 2032
b1ba4ddd 2033static int _proc_do_string(void* data, int maxlen, int write,
8d65af78 2034 void __user *buffer,
b1ba4ddd 2035 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2036{
2037 size_t len;
2038 char __user *p;
2039 char c;
8d060877
ON		 2040
2041 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2042 *lenp = 0;
2043 return 0;
2044 }
8d060877 2045
1da177e4
LT		 2046 if (write) {
2047 len = 0;
2048 p = buffer;
2049 while (len < *lenp) {
2050 if (get_user(c, p++))
2051 return -EFAULT;
2052 if (c == 0 || c == '\n')
2053 break;
2054 len++;
2055 }
f5dd3d6f
SV		 2056 if (len >= maxlen)
2057 len = maxlen-1;
2058 if(copy_from_user(data, buffer, len))
1da177e4 2059 return -EFAULT;
f5dd3d6f 2060 ((char *) data)[len] = 0;
1da177e4
LT		 2061 *ppos += *lenp;
2062 } else {
f5dd3d6f
SV		 2063 len = strlen(data);
2064 if (len > maxlen)
2065 len = maxlen;
8d060877
ON		 2066
2067 if (*ppos > len) {
2068 *lenp = 0;
2069 return 0;
2070 }
2071
2072 data += *ppos;
2073 len -= *ppos;
2074
1da177e4
LT		 2075 if (len > *lenp)
2076 len = *lenp;
2077 if (len)
f5dd3d6f 2078 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2079 return -EFAULT;
2080 if (len < *lenp) {
2081 if(put_user('\n', ((char __user *) buffer) + len))
2082 return -EFAULT;
2083 len++;
2084 }
2085 *lenp = len;
2086 *ppos += len;
2087 }
2088 return 0;
2089}
2090
f5dd3d6f
SV		 2091/**
2092 * proc_dostring - read a string sysctl
2093 * @table: the sysctl table
2094 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 2095 * @buffer: the user buffer
2096 * @lenp: the size of the user buffer
2097 * @ppos: file position
2098 *
2099 * Reads/writes a string from/to the user buffer. If the kernel
2100 * buffer provided is not large enough to hold the string, the
2101 * string is truncated. The copied string is %NULL-terminated.
2102 * If the string is being read by the user process, it is copied
2103 * and a newline '\n' is added. It is truncated if the buffer is
2104 * not large enough.
2105 *
2106 * Returns 0 on success.
2107 */
8d65af78 2108int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 2109 void __user *buffer, size_t *lenp, loff_t *ppos)
2110{
8d65af78 2111 return _proc_do_string(table->data, table->maxlen, write,
f5dd3d6f
SV		 2112 buffer, lenp, ppos);
2113}
2114
00b7c339
AW		 2115static size_t proc_skip_spaces(char **buf)
2116{
2117 size_t ret;
2118 char *tmp = skip_spaces(*buf);
2119 ret = tmp - *buf;
2120 *buf = tmp;
2121 return ret;
2122}
2123
9f977fb7
OP		 2124static void proc_skip_char(char **buf, size_t *size, const char v)
2125{
2126 while (*size) {
2127 if (**buf != v)
2128 break;
2129 (*size)--;
2130 (*buf)++;
2131 }
2132}
2133
00b7c339
AW		 2134#define TMPBUFLEN 22
2135/**
0fc377bd 2136 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2137 *
0fc377bd
RD		 2138 * @buf: a kernel buffer
2139 * @size: size of the kernel buffer
2140 * @val: this is where the number will be stored
2141 * @neg: set to %TRUE if number is negative
2142 * @perm_tr: a vector which contains the allowed trailers
2143 * @perm_tr_len: size of the perm_tr vector
2144 * @tr: pointer to store the trailer character
00b7c339 2145 *
0fc377bd
RD		 2146 * In case of success %0 is returned and @buf and @size are updated with
2147 * the amount of bytes read. If @tr is non-NULL and a trailing
2148 * character exists (size is non-zero after returning from this
2149 * function), @tr is updated with the trailing character.
00b7c339
AW		 2150 */
2151static int proc_get_long(char **buf, size_t *size,
2152 unsigned long *val, bool *neg,
2153 const char *perm_tr, unsigned perm_tr_len, char *tr)
2154{
2155 int len;
2156 char *p, tmp[TMPBUFLEN];
2157
2158 if (!*size)
2159 return -EINVAL;
2160
2161 len = *size;
2162 if (len > TMPBUFLEN - 1)
2163 len = TMPBUFLEN - 1;
2164
2165 memcpy(tmp, *buf, len);
2166
2167 tmp[len] = 0;
2168 p = tmp;
2169 if (*p == '-' && *size > 1) {
2170 *neg = true;
2171 p++;
2172 } else
2173 *neg = false;
2174 if (!isdigit(*p))
2175 return -EINVAL;
2176
2177 *val = simple_strtoul(p, &p, 0);
2178
2179 len = p - tmp;
2180
2181 /* We don't know if the next char is whitespace thus we may accept
2182 * invalid integers (e.g. 1234...a) or two integers instead of one
2183 * (e.g. 123...1). So lets not allow such large numbers. */
2184 if (len == TMPBUFLEN - 1)
2185 return -EINVAL;
2186
2187 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2188 return -EINVAL;
1da177e4 2189
00b7c339
AW		 2190 if (tr && (len < *size))
2191 *tr = *p;
2192
2193 *buf += len;
2194 *size -= len;
2195
2196 return 0;
2197}
2198
2199/**
0fc377bd 2200 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2201 *
0fc377bd
RD		 2202 * @buf: the user buffer
2203 * @size: the size of the user buffer
2204 * @val: the integer to be converted
2205 * @neg: sign of the number, %TRUE for negative
00b7c339 2206 *
0fc377bd
RD		 2207 * In case of success %0 is returned and @buf and @size are updated with
2208 * the amount of bytes written.
00b7c339
AW		 2209 */
2210static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2211 bool neg)
2212{
2213 int len;
2214 char tmp[TMPBUFLEN], *p = tmp;
2215
2216 sprintf(p, "%s%lu", neg ? "-" : "", val);
2217 len = strlen(tmp);
2218 if (len > *size)
2219 len = *size;
2220 if (copy_to_user(*buf, tmp, len))
2221 return -EFAULT;
2222 *size -= len;
2223 *buf += len;
2224 return 0;
2225}
2226#undef TMPBUFLEN
2227
2228static int proc_put_char(void __user **buf, size_t *size, char c)
2229{
2230 if (*size) {
2231 char __user **buffer = (char __user **)buf;
2232 if (put_user(c, *buffer))
2233 return -EFAULT;
2234 (*size)--, (*buffer)++;
2235 *buf = *buffer;
2236 }
2237 return 0;
2238}
1da177e4 2239
00b7c339 2240static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2241 int *valp,
2242 int write, void *data)
2243{
2244 if (write) {
2245 *valp = *negp ? -*lvalp : *lvalp;
2246 } else {
2247 int val = *valp;
2248 if (val < 0) {
00b7c339 2249 *negp = true;
1da177e4
LT		 2250 *lvalp = (unsigned long)-val;
2251 } else {
00b7c339 2252 *negp = false;
1da177e4
LT		 2253 *lvalp = (unsigned long)val;
2254 }
2255 }
2256 return 0;
2257}
2258
00b7c339
AW		 2259static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2260
d8217f07 2261static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2262 int write, void __user *buffer,
fcfbd547 2263 size_t *lenp, loff_t *ppos,
00b7c339 2264 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2265 int write, void *data),
2266 void *data)
2267{
00b7c339
AW		 2268 int *i, vleft, first = 1, err = 0;
2269 unsigned long page = 0;
2270 size_t left;
2271 char *kbuf;
1da177e4 2272
00b7c339 2273 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2274 *lenp = 0;
2275 return 0;
2276 }
2277
fcfbd547 2278 i = (int *) tbl_data;
1da177e4
LT		 2279 vleft = table->maxlen / sizeof(*i);
2280 left = *lenp;
2281
2282 if (!conv)
2283 conv = do_proc_dointvec_conv;
2284
00b7c339
AW		 2285 if (write) {
2286 if (left > PAGE_SIZE - 1)
2287 left = PAGE_SIZE - 1;
2288 page = __get_free_page(GFP_TEMPORARY);
2289 kbuf = (char *) page;
2290 if (!kbuf)
2291 return -ENOMEM;
2292 if (copy_from_user(kbuf, buffer, left)) {
2293 err = -EFAULT;
2294 goto free;
2295 }
2296 kbuf[left] = 0;
2297 }
2298
1da177e4 2299 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2300 unsigned long lval;
2301 bool neg;
1da177e4 2302
00b7c339
AW		 2303 if (write) {
2304 left -= proc_skip_spaces(&kbuf);
1da177e4 2305
563b0467
O		 2306 if (!left)
2307 break;
00b7c339
AW		 2308 err = proc_get_long(&kbuf, &left, &lval, &neg,
2309 proc_wspace_sep,
2310 sizeof(proc_wspace_sep), NULL);
2311 if (err)
1da177e4 2312 break;
00b7c339
AW		 2313 if (conv(&neg, &lval, i, 1, data)) {
2314 err = -EINVAL;
1da177e4 2315 break;
00b7c339 2316 }
1da177e4 2317 } else {
00b7c339
AW		 2318 if (conv(&neg, &lval, i, 0, data)) {
2319 err = -EINVAL;
2320 break;
2321 }
1da177e4 2322 if (!first)
00b7c339
AW		 2323 err = proc_put_char(&buffer, &left, '\t');
2324 if (err)
2325 break;
2326 err = proc_put_long(&buffer, &left, lval, neg);
2327 if (err)
1da177e4 2328 break;
1da177e4
LT		 2329 }
2330 }
2331
00b7c339
AW		 2332 if (!write && !first && left && !err)
2333 err = proc_put_char(&buffer, &left, '\n');
563b0467 2334 if (write && !err && left)
00b7c339
AW		 2335 left -= proc_skip_spaces(&kbuf);
2336free:
1da177e4 2337 if (write) {
00b7c339
AW		 2338 free_page(page);
2339 if (first)
2340 return err ? : -EINVAL;
1da177e4 2341 }
1da177e4
LT		 2342 *lenp -= left;
2343 *ppos += *lenp;
00b7c339 2344 return err;
1da177e4
LT		 2345}
2346
8d65af78 2347static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2348 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2349 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2350 int write, void *data),
2351 void *data)
2352{
8d65af78 2353 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2354 buffer, lenp, ppos, conv, data);
2355}
2356
1da177e4
LT		 2357/**
2358 * proc_dointvec - read a vector of integers
2359 * @table: the sysctl table
2360 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2361 * @buffer: the user buffer
2362 * @lenp: the size of the user buffer
2363 * @ppos: file position
2364 *
2365 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2366 * values from/to the user buffer, treated as an ASCII string.
2367 *
2368 * Returns 0 on success.
2369 */
8d65af78 2370int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2371 void __user *buffer, size_t *lenp, loff_t *ppos)
2372{
8d65af78 2373 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2374 NULL,NULL);
2375}
2376
34f5a398 2377/*
25ddbb18
AK		 2378 * Taint values can only be increased
2379 * This means we can safely use a temporary.
34f5a398 2380 */
8d65af78 2381static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2382 void __user *buffer, size_t *lenp, loff_t *ppos)
2383{
25ddbb18
AK		 2384 struct ctl_table t;
2385 unsigned long tmptaint = get_taint();
2386 int err;
34f5a398 2387
91fcd412 2388 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2389 return -EPERM;
2390
25ddbb18
AK		 2391 t = *table;
2392 t.data = &tmptaint;
8d65af78 2393 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2394 if (err < 0)
2395 return err;
2396
2397 if (write) {
2398 /*
2399 * Poor man's atomic or. Not worth adding a primitive
2400 * to everyone's atomic.h for this
2401 */
2402 int i;
2403 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2404 if ((tmptaint >> i) & 1)
2405 add_taint(i);
2406 }
2407 }
2408
2409 return err;
34f5a398
TT		 2410}
2411
bfdc0b49
RW		 2412#ifdef CONFIG_PRINTK
2413static int proc_dmesg_restrict(struct ctl_table *table, int write,
2414 void __user *buffer, size_t *lenp, loff_t *ppos)
2415{
2416 if (write && !capable(CAP_SYS_ADMIN))
2417 return -EPERM;
2418
2419 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2420}
2421#endif
2422
1da177e4
LT		 2423struct do_proc_dointvec_minmax_conv_param {
2424 int *min;
2425 int *max;
2426};
2427
00b7c339
AW		 2428static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2429 int *valp,
1da177e4
LT		 2430 int write, void *data)
2431{
2432 struct do_proc_dointvec_minmax_conv_param *param = data;
2433 if (write) {
2434 int val = *negp ? -*lvalp : *lvalp;
2435 if ((param->min && *param->min > val) ||
2436 (param->max && *param->max < val))
2437 return -EINVAL;
2438 *valp = val;
2439 } else {
2440 int val = *valp;
2441 if (val < 0) {
00b7c339 2442 *negp = true;
1da177e4
LT		 2443 *lvalp = (unsigned long)-val;
2444 } else {
00b7c339 2445 *negp = false;
1da177e4
LT		 2446 *lvalp = (unsigned long)val;
2447 }
2448 }
2449 return 0;
2450}
2451
2452/**
2453 * proc_dointvec_minmax - read a vector of integers with min/max values
2454 * @table: the sysctl table
2455 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2456 * @buffer: the user buffer
2457 * @lenp: the size of the user buffer
2458 * @ppos: file position
2459 *
2460 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2461 * values from/to the user buffer, treated as an ASCII string.
2462 *
2463 * This routine will ensure the values are within the range specified by
2464 * table->extra1 (min) and table->extra2 (max).
2465 *
2466 * Returns 0 on success.
2467 */
8d65af78 2468int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2469 void __user *buffer, size_t *lenp, loff_t *ppos)
2470{
2471 struct do_proc_dointvec_minmax_conv_param param = {
2472 .min = (int *) table->extra1,
2473 .max = (int *) table->extra2,
2474 };
8d65af78 2475 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2476 do_proc_dointvec_minmax_conv, &param);
2477}
2478
d8217f07 2479static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2480 void __user *buffer,
2481 size_t *lenp, loff_t *ppos,
2482 unsigned long convmul,
2483 unsigned long convdiv)
2484{
00b7c339
AW		 2485 unsigned long *i, *min, *max;
2486 int vleft, first = 1, err = 0;
2487 unsigned long page = 0;
2488 size_t left;
2489 char *kbuf;
2490
2491 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2492 *lenp = 0;
2493 return 0;
2494 }
00b7c339 2495
fcfbd547 2496 i = (unsigned long *) data;
1da177e4
LT		 2497 min = (unsigned long *) table->extra1;
2498 max = (unsigned long *) table->extra2;
2499 vleft = table->maxlen / sizeof(unsigned long);
2500 left = *lenp;
00b7c339
AW		 2501
2502 if (write) {
2503 if (left > PAGE_SIZE - 1)
2504 left = PAGE_SIZE - 1;
2505 page = __get_free_page(GFP_TEMPORARY);
2506 kbuf = (char *) page;
2507 if (!kbuf)
2508 return -ENOMEM;
2509 if (copy_from_user(kbuf, buffer, left)) {
2510 err = -EFAULT;
2511 goto free;
2512 }
2513 kbuf[left] = 0;
2514 }
2515
27b3d80a 2516 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2517 unsigned long val;
2518
1da177e4 2519 if (write) {
00b7c339
AW		 2520 bool neg;
2521
2522 left -= proc_skip_spaces(&kbuf);
2523
2524 err = proc_get_long(&kbuf, &left, &val, &neg,
2525 proc_wspace_sep,
2526 sizeof(proc_wspace_sep), NULL);
2527 if (err)
1da177e4
LT		 2528 break;
2529 if (neg)
1da177e4
LT		 2530 continue;
2531 if ((min && val < *min) || (max && val > *max))
2532 continue;
2533 *i = val;
2534 } else {
00b7c339 2535 val = convdiv * (*i) / convmul;
1da177e4 2536 if (!first)
00b7c339
AW		 2537 err = proc_put_char(&buffer, &left, '\t');
2538 err = proc_put_long(&buffer, &left, val, false);
2539 if (err)
2540 break;
1da177e4
LT		 2541 }
2542 }
2543
00b7c339
AW		 2544 if (!write && !first && left && !err)
2545 err = proc_put_char(&buffer, &left, '\n');
2546 if (write && !err)
2547 left -= proc_skip_spaces(&kbuf);
2548free:
1da177e4 2549 if (write) {
00b7c339
AW		 2550 free_page(page);
2551 if (first)
2552 return err ? : -EINVAL;
1da177e4 2553 }
1da177e4
LT		 2554 *lenp -= left;
2555 *ppos += *lenp;
00b7c339 2556 return err;
1da177e4
LT		 2557}
2558
d8217f07 2559static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2560 void __user *buffer,
2561 size_t *lenp, loff_t *ppos,
2562 unsigned long convmul,
2563 unsigned long convdiv)
2564{
2565 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2566 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2567}
2568
1da177e4
LT		 2569/**
2570 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2571 * @table: the sysctl table
2572 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2573 * @buffer: the user buffer
2574 * @lenp: the size of the user buffer
2575 * @ppos: file position
2576 *
2577 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2578 * values from/to the user buffer, treated as an ASCII string.
2579 *
2580 * This routine will ensure the values are within the range specified by
2581 * table->extra1 (min) and table->extra2 (max).
2582 *
2583 * Returns 0 on success.
2584 */
8d65af78 2585int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2586 void __user *buffer, size_t *lenp, loff_t *ppos)
2587{
8d65af78 2588 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2589}
2590
2591/**
2592 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2593 * @table: the sysctl table
2594 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2595 * @buffer: the user buffer
2596 * @lenp: the size of the user buffer
2597 * @ppos: file position
2598 *
2599 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2600 * values from/to the user buffer, treated as an ASCII string. The values
2601 * are treated as milliseconds, and converted to jiffies when they are stored.
2602 *
2603 * This routine will ensure the values are within the range specified by
2604 * table->extra1 (min) and table->extra2 (max).
2605 *
2606 * Returns 0 on success.
2607 */
d8217f07 2608int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2609 void __user *buffer,
2610 size_t *lenp, loff_t *ppos)
2611{
8d65af78 2612 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2613 lenp, ppos, HZ, 1000l);
2614}
2615
2616
00b7c339 2617static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2618 int *valp,
2619 int write, void *data)
2620{
2621 if (write) {
cba9f33d
BS		 2622 if (*lvalp > LONG_MAX / HZ)
2623 return 1;
1da177e4
LT		 2624 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2625 } else {
2626 int val = *valp;
2627 unsigned long lval;
2628 if (val < 0) {
00b7c339 2629 *negp = true;
1da177e4
LT		 2630 lval = (unsigned long)-val;
2631 } else {
00b7c339 2632 *negp = false;
1da177e4
LT		 2633 lval = (unsigned long)val;
2634 }
2635 *lvalp = lval / HZ;
2636 }
2637 return 0;
2638}
2639
00b7c339 2640static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2641 int *valp,
2642 int write, void *data)
2643{
2644 if (write) {
cba9f33d
BS		 2645 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2646 return 1;
1da177e4
LT		 2647 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2648 } else {
2649 int val = *valp;
2650 unsigned long lval;
2651 if (val < 0) {
00b7c339 2652 *negp = true;
1da177e4
LT		 2653 lval = (unsigned long)-val;
2654 } else {
00b7c339 2655 *negp = false;
1da177e4
LT		 2656 lval = (unsigned long)val;
2657 }
2658 *lvalp = jiffies_to_clock_t(lval);
2659 }
2660 return 0;
2661}
2662
00b7c339 2663static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2664 int *valp,
2665 int write, void *data)
2666{
2667 if (write) {
2668 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2669 } else {
2670 int val = *valp;
2671 unsigned long lval;
2672 if (val < 0) {
00b7c339 2673 *negp = true;
1da177e4
LT		 2674 lval = (unsigned long)-val;
2675 } else {
00b7c339 2676 *negp = false;
1da177e4
LT		 2677 lval = (unsigned long)val;
2678 }
2679 *lvalp = jiffies_to_msecs(lval);
2680 }
2681 return 0;
2682}
2683
2684/**
2685 * proc_dointvec_jiffies - read a vector of integers as seconds
2686 * @table: the sysctl table
2687 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2688 * @buffer: the user buffer
2689 * @lenp: the size of the user buffer
2690 * @ppos: file position
2691 *
2692 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2693 * values from/to the user buffer, treated as an ASCII string.
2694 * The values read are assumed to be in seconds, and are converted into
2695 * jiffies.
2696 *
2697 * Returns 0 on success.
2698 */
8d65af78 2699int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701{
8d65af78 2702 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2703 do_proc_dointvec_jiffies_conv,NULL);
2704}
2705
2706/**
2707 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2708 * @table: the sysctl table
2709 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2710 * @buffer: the user buffer
2711 * @lenp: the size of the user buffer
1e5d5331 2712 * @ppos: pointer to the file position
1da177e4
LT		 2713 *
2714 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2715 * values from/to the user buffer, treated as an ASCII string.
2716 * The values read are assumed to be in 1/USER_HZ seconds, and
2717 * are converted into jiffies.
2718 *
2719 * Returns 0 on success.
2720 */
8d65af78 2721int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2722 void __user *buffer, size_t *lenp, loff_t *ppos)
2723{
8d65af78 2724 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2725 do_proc_dointvec_userhz_jiffies_conv,NULL);
2726}
2727
2728/**
2729 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2730 * @table: the sysctl table
2731 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2732 * @buffer: the user buffer
2733 * @lenp: the size of the user buffer
67be2dd1
MW		 2734 * @ppos: file position
2735 * @ppos: the current position in the file
1da177e4
LT		 2736 *
2737 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2738 * values from/to the user buffer, treated as an ASCII string.
2739 * The values read are assumed to be in 1/1000 seconds, and
2740 * are converted into jiffies.
2741 *
2742 * Returns 0 on success.
2743 */
8d65af78 2744int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2745 void __user *buffer, size_t *lenp, loff_t *ppos)
2746{
8d65af78 2747 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2748 do_proc_dointvec_ms_jiffies_conv, NULL);
2749}
2750
8d65af78 2751static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2752 void __user *buffer, size_t *lenp, loff_t *ppos)
2753{
2754 struct pid *new_pid;
2755 pid_t tmp;
2756 int r;
2757
6c5f3e7b 2758 tmp = pid_vnr(cad_pid);
9ec52099 2759
8d65af78 2760 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2761 lenp, ppos, NULL, NULL);
2762 if (r || !write)
2763 return r;
2764
2765 new_pid = find_get_pid(tmp);
2766 if (!new_pid)
2767 return -ESRCH;
2768
2769 put_pid(xchg(&cad_pid, new_pid));
2770 return 0;
2771}
2772
9f977fb7
OP		 2773/**
2774 * proc_do_large_bitmap - read/write from/to a large bitmap
2775 * @table: the sysctl table
2776 * @write: %TRUE if this is a write to the sysctl file
2777 * @buffer: the user buffer
2778 * @lenp: the size of the user buffer
2779 * @ppos: file position
2780 *
2781 * The bitmap is stored at table->data and the bitmap length (in bits)
2782 * in table->maxlen.
2783 *
2784 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2785 * large bitmaps may be represented in a compact manner. Writing into
2786 * the file will clear the bitmap then update it with the given input.
2787 *
2788 * Returns 0 on success.
2789 */
2790int proc_do_large_bitmap(struct ctl_table *table, int write,
2791 void __user *buffer, size_t *lenp, loff_t *ppos)
2792{
2793 int err = 0;
2794 bool first = 1;
2795 size_t left = *lenp;
2796 unsigned long bitmap_len = table->maxlen;
2797 unsigned long *bitmap = (unsigned long *) table->data;
2798 unsigned long *tmp_bitmap = NULL;
2799 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2800
2801 if (!bitmap_len || !left || (*ppos && !write)) {
2802 *lenp = 0;
2803 return 0;
2804 }
2805
2806 if (write) {
2807 unsigned long page = 0;
2808 char *kbuf;
2809
2810 if (left > PAGE_SIZE - 1)
2811 left = PAGE_SIZE - 1;
2812
2813 page = __get_free_page(GFP_TEMPORARY);
2814 kbuf = (char *) page;
2815 if (!kbuf)
2816 return -ENOMEM;
2817 if (copy_from_user(kbuf, buffer, left)) {
2818 free_page(page);
2819 return -EFAULT;
2820 }
2821 kbuf[left] = 0;
2822
2823 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2824 GFP_KERNEL);
2825 if (!tmp_bitmap) {
2826 free_page(page);
2827 return -ENOMEM;
2828 }
2829 proc_skip_char(&kbuf, &left, '\n');
2830 while (!err && left) {
2831 unsigned long val_a, val_b;
2832 bool neg;
2833
2834 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2835 sizeof(tr_a), &c);
2836 if (err)
2837 break;
2838 if (val_a >= bitmap_len || neg) {
2839 err = -EINVAL;
2840 break;
2841 }
2842
2843 val_b = val_a;
2844 if (left) {
2845 kbuf++;
2846 left--;
2847 }
2848
2849 if (c == '-') {
2850 err = proc_get_long(&kbuf, &left, &val_b,
2851 &neg, tr_b, sizeof(tr_b),
2852 &c);
2853 if (err)
2854 break;
2855 if (val_b >= bitmap_len || neg ||
2856 val_a > val_b) {
2857 err = -EINVAL;
2858 break;
2859 }
2860 if (left) {
2861 kbuf++;
2862 left--;
2863 }
2864 }
2865
2866 while (val_a <= val_b)
2867 set_bit(val_a++, tmp_bitmap);
2868
2869 first = 0;
2870 proc_skip_char(&kbuf, &left, '\n');
2871 }
2872 free_page(page);
2873 } else {
2874 unsigned long bit_a, bit_b = 0;
2875
2876 while (left) {
2877 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2878 if (bit_a >= bitmap_len)
2879 break;
2880 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2881 bit_a + 1) - 1;
2882
2883 if (!first) {
2884 err = proc_put_char(&buffer, &left, ',');
2885 if (err)
2886 break;
2887 }
2888 err = proc_put_long(&buffer, &left, bit_a, false);
2889 if (err)
2890 break;
2891 if (bit_a != bit_b) {
2892 err = proc_put_char(&buffer, &left, '-');
2893 if (err)
2894 break;
2895 err = proc_put_long(&buffer, &left, bit_b, false);
2896 if (err)
2897 break;
2898 }
2899
2900 first = 0; bit_b++;
2901 }
2902 if (!err)
2903 err = proc_put_char(&buffer, &left, '\n');
2904 }
2905
2906 if (!err) {
2907 if (write) {
2908 if (*ppos)
2909 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2910 else
2911 memcpy(bitmap, tmp_bitmap,
2912 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2913 }
2914 kfree(tmp_bitmap);
2915 *lenp -= left;
2916 *ppos += *lenp;
2917 return 0;
2918 } else {
2919 kfree(tmp_bitmap);
2920 return err;
2921 }
2922}
2923
55610500 2924#else /* CONFIG_PROC_SYSCTL */
1da177e4 2925
8d65af78 2926int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2927 void __user *buffer, size_t *lenp, loff_t *ppos)
2928{
2929 return -ENOSYS;
2930}
2931
8d65af78 2932int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2933 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2934{
2935 return -ENOSYS;
2936}
2937
8d65af78 2938int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2939 void __user *buffer, size_t *lenp, loff_t *ppos)
2940{
2941 return -ENOSYS;
2942}
2943
8d65af78 2944int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2945 void __user *buffer, size_t *lenp, loff_t *ppos)
2946{
2947 return -ENOSYS;
2948}
2949
8d65af78 2950int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2951 void __user *buffer, size_t *lenp, loff_t *ppos)
2952{
2953 return -ENOSYS;
2954}
2955
8d65af78 2956int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2957 void __user *buffer, size_t *lenp, loff_t *ppos)
2958{
2959 return -ENOSYS;
2960}
2961
8d65af78 2962int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2963 void __user *buffer, size_t *lenp, loff_t *ppos)
2964{
2965 return -ENOSYS;
2966}
2967
d8217f07 2968int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2969 void __user *buffer,
2970 size_t *lenp, loff_t *ppos)
2971{
2972 return -ENOSYS;
2973}
2974
2975
55610500 2976#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2977
1da177e4
LT		 2978/*
2979 * No sense putting this after each symbol definition, twice,
2980 * exception granted :-)
2981 */
2982EXPORT_SYMBOL(proc_dointvec);
2983EXPORT_SYMBOL(proc_dointvec_jiffies);
2984EXPORT_SYMBOL(proc_dointvec_minmax);
2985EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2986EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2987EXPORT_SYMBOL(proc_dostring);
2988EXPORT_SYMBOL(proc_doulongvec_minmax);
2989EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2990EXPORT_SYMBOL(register_sysctl_table);
29e796fd 2991EXPORT_SYMBOL(register_sysctl_paths);
1da177e4 2992EXPORT_SYMBOL(unregister_sysctl_table);
kernel source for telekom puls (alcatel/mediatek)