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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[deliverable/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
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
aa4a2218
VW		 941 /*
942 * User-space scripts rely on the existence of this file
943 * as a feature check for perf_events being enabled.
944 *
945 * So it's an ABI, do not remove!
946 */
1ccd1549 947 {
cdd6c482
IM		 948 .procname = "perf_event_paranoid",
949 .data = &sysctl_perf_event_paranoid,
950 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549 951 .mode = 0644,
6d456111 952 .proc_handler = proc_dointvec,
1ccd1549 953 },
c5078f78 954 {
cdd6c482
IM		 955 .procname = "perf_event_mlock_kb",
956 .data = &sysctl_perf_event_mlock,
957 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78 958 .mode = 0644,
6d456111 959 .proc_handler = proc_dointvec,
c5078f78 960 },
a78ac325 961 {
cdd6c482
IM		 962 .procname = "perf_event_max_sample_rate",
963 .data = &sysctl_perf_event_sample_rate,
964 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325 965 .mode = 0644,
163ec435 966 .proc_handler = perf_proc_update_handler,
a78ac325 967 },
1ccd1549 968#endif
dfec072e
VN		 969#ifdef CONFIG_KMEMCHECK
970 {
dfec072e
VN		 971 .procname = "kmemcheck",
972 .data = &kmemcheck_enabled,
973 .maxlen = sizeof(int),
974 .mode = 0644,
6d456111 975 .proc_handler = proc_dointvec,
dfec072e
VN		 976 },
977#endif
cb684b5b 978#ifdef CONFIG_BLOCK
5e605b64 979 {
5e605b64
JA		 980 .procname = "blk_iopoll",
981 .data = &blk_iopoll_enabled,
982 .maxlen = sizeof(int),
983 .mode = 0644,
6d456111 984 .proc_handler = proc_dointvec,
5e605b64 985 },
cb684b5b 986#endif
6fce56ec 987 { }
1da177e4
LT		 988};
989
d8217f07 990static struct ctl_table vm_table[] = {
1da177e4 991 {
1da177e4
LT		 992 .procname = "overcommit_memory",
993 .data = &sysctl_overcommit_memory,
994 .maxlen = sizeof(sysctl_overcommit_memory),
995 .mode = 0644,
cb16e95f
PH		 996 .proc_handler = proc_dointvec_minmax,
997 .extra1 = &zero,
998 .extra2 = &two,
1da177e4 999 },
fadd8fbd 1000 {
fadd8fbd
KH		 1001 .procname = "panic_on_oom",
1002 .data = &sysctl_panic_on_oom,
1003 .maxlen = sizeof(sysctl_panic_on_oom),
1004 .mode = 0644,
cb16e95f
PH		 1005 .proc_handler = proc_dointvec_minmax,
1006 .extra1 = &zero,
1007 .extra2 = &two,
fadd8fbd 1008 },
fe071d7e 1009 {
fe071d7e
DR		 1010 .procname = "oom_kill_allocating_task",
1011 .data = &sysctl_oom_kill_allocating_task,
1012 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1013 .mode = 0644,
6d456111 1014 .proc_handler = proc_dointvec,
fe071d7e 1015 },
fef1bdd6 1016 {
fef1bdd6
DR		 1017 .procname = "oom_dump_tasks",
1018 .data = &sysctl_oom_dump_tasks,
1019 .maxlen = sizeof(sysctl_oom_dump_tasks),
1020 .mode = 0644,
6d456111 1021 .proc_handler = proc_dointvec,
fef1bdd6 1022 },
1da177e4 1023 {
1da177e4
LT		 1024 .procname = "overcommit_ratio",
1025 .data = &sysctl_overcommit_ratio,
1026 .maxlen = sizeof(sysctl_overcommit_ratio),
1027 .mode = 0644,
6d456111 1028 .proc_handler = proc_dointvec,
1da177e4
LT		 1029 },
1030 {
1da177e4
LT		 1031 .procname = "page-cluster",
1032 .data = &page_cluster,
1033 .maxlen = sizeof(int),
1034 .mode = 0644,
cb16e95f
PH		 1035 .proc_handler = proc_dointvec_minmax,
1036 .extra1 = &zero,
1da177e4
LT		 1037 },
1038 {
1da177e4
LT		 1039 .procname = "dirty_background_ratio",
1040 .data = &dirty_background_ratio,
1041 .maxlen = sizeof(dirty_background_ratio),
1042 .mode = 0644,
6d456111 1043 .proc_handler = dirty_background_ratio_handler,
1da177e4
LT		 1044 .extra1 = &zero,
1045 .extra2 = &one_hundred,
1046 },
2da02997 1047 {
2da02997
DR		 1048 .procname = "dirty_background_bytes",
1049 .data = &dirty_background_bytes,
1050 .maxlen = sizeof(dirty_background_bytes),
1051 .mode = 0644,
6d456111 1052 .proc_handler = dirty_background_bytes_handler,
fc3501d4 1053 .extra1 = &one_ul,
2da02997 1054 },
1da177e4 1055 {
1da177e4
LT		 1056 .procname = "dirty_ratio",
1057 .data = &vm_dirty_ratio,
1058 .maxlen = sizeof(vm_dirty_ratio),
1059 .mode = 0644,
6d456111 1060 .proc_handler = dirty_ratio_handler,
1da177e4
LT		 1061 .extra1 = &zero,
1062 .extra2 = &one_hundred,
1063 },
2da02997 1064 {
2da02997
DR		 1065 .procname = "dirty_bytes",
1066 .data = &vm_dirty_bytes,
1067 .maxlen = sizeof(vm_dirty_bytes),
1068 .mode = 0644,
6d456111 1069 .proc_handler = dirty_bytes_handler,
9e4a5bda 1070 .extra1 = &dirty_bytes_min,
2da02997 1071 },
1da177e4 1072 {
1da177e4 1073 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1074 .data = &dirty_writeback_interval,
1075 .maxlen = sizeof(dirty_writeback_interval),
1da177e4 1076 .mode = 0644,
6d456111 1077 .proc_handler = dirty_writeback_centisecs_handler,
1da177e4
LT		 1078 },
1079 {
1da177e4 1080 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1081 .data = &dirty_expire_interval,
1082 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1083 .mode = 0644,
cb16e95f
PH		 1084 .proc_handler = proc_dointvec_minmax,
1085 .extra1 = &zero,
1da177e4
LT		 1086 },
1087 {
1da177e4
LT		 1088 .procname = "nr_pdflush_threads",
1089 .data = &nr_pdflush_threads,
1090 .maxlen = sizeof nr_pdflush_threads,
1091 .mode = 0444 /* read-only*/,
6d456111 1092 .proc_handler = proc_dointvec,
1da177e4
LT		 1093 },
1094 {
1da177e4
LT		 1095 .procname = "swappiness",
1096 .data = &vm_swappiness,
1097 .maxlen = sizeof(vm_swappiness),
1098 .mode = 0644,
6d456111 1099 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1100 .extra1 = &zero,
1101 .extra2 = &one_hundred,
1102 },
1103#ifdef CONFIG_HUGETLB_PAGE
06808b08 1104 {
1da177e4 1105 .procname = "nr_hugepages",
e5ff2159 1106 .data = NULL,
1da177e4
LT		 1107 .maxlen = sizeof(unsigned long),
1108 .mode = 0644,
6d456111 1109 .proc_handler = hugetlb_sysctl_handler,
1da177e4
LT		 1110 .extra1 = (void *)&hugetlb_zero,
1111 .extra2 = (void *)&hugetlb_infinity,
06808b08
LS		 1112 },
1113#ifdef CONFIG_NUMA
1114 {
1115 .procname = "nr_hugepages_mempolicy",
1116 .data = NULL,
1117 .maxlen = sizeof(unsigned long),
1118 .mode = 0644,
1119 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1120 .extra1 = (void *)&hugetlb_zero,
1121 .extra2 = (void *)&hugetlb_infinity,
1122 },
1123#endif
1da177e4 1124 {
1da177e4
LT		 1125 .procname = "hugetlb_shm_group",
1126 .data = &sysctl_hugetlb_shm_group,
1127 .maxlen = sizeof(gid_t),
1128 .mode = 0644,
6d456111 1129 .proc_handler = proc_dointvec,
1da177e4 1130 },
396faf03 1131 {
396faf03
MG		 1132 .procname = "hugepages_treat_as_movable",
1133 .data = &hugepages_treat_as_movable,
1134 .maxlen = sizeof(int),
1135 .mode = 0644,
6d456111 1136 .proc_handler = hugetlb_treat_movable_handler,
396faf03 1137 },
d1c3fb1f 1138 {
d1c3fb1f 1139 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1140 .data = NULL,
1141 .maxlen = sizeof(unsigned long),
d1c3fb1f 1142 .mode = 0644,
6d456111 1143 .proc_handler = hugetlb_overcommit_handler,
e5ff2159
AK		 1144 .extra1 = (void *)&hugetlb_zero,
1145 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1146 },
1da177e4
LT		 1147#endif
1148 {
1da177e4
LT		 1149 .procname = "lowmem_reserve_ratio",
1150 .data = &sysctl_lowmem_reserve_ratio,
1151 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1152 .mode = 0644,
6d456111 1153 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1da177e4 1154 },
9d0243bc 1155 {
9d0243bc
AM		 1156 .procname = "drop_caches",
1157 .data = &sysctl_drop_caches,
1158 .maxlen = sizeof(int),
1159 .mode = 0644,
1160 .proc_handler = drop_caches_sysctl_handler,
cb16e95f
PH		 1161 .extra1 = &one,
1162 .extra2 = &three,
9d0243bc 1163 },
76ab0f53
MG		 1164#ifdef CONFIG_COMPACTION
1165 {
1166 .procname = "compact_memory",
1167 .data = &sysctl_compact_memory,
1168 .maxlen = sizeof(int),
1169 .mode = 0200,
1170 .proc_handler = sysctl_compaction_handler,
1171 },
5e771905
MG		 1172 {
1173 .procname = "extfrag_threshold",
1174 .data = &sysctl_extfrag_threshold,
1175 .maxlen = sizeof(int),
1176 .mode = 0644,
1177 .proc_handler = sysctl_extfrag_handler,
1178 .extra1 = &min_extfrag_threshold,
1179 .extra2 = &max_extfrag_threshold,
1180 },
1181
76ab0f53 1182#endif /* CONFIG_COMPACTION */
1da177e4 1183 {
1da177e4
LT		 1184 .procname = "min_free_kbytes",
1185 .data = &min_free_kbytes,
1186 .maxlen = sizeof(min_free_kbytes),
1187 .mode = 0644,
6d456111 1188 .proc_handler = min_free_kbytes_sysctl_handler,
1da177e4
LT		 1189 .extra1 = &zero,
1190 },
8ad4b1fb 1191 {
8ad4b1fb
RS		 1192 .procname = "percpu_pagelist_fraction",
1193 .data = &percpu_pagelist_fraction,
1194 .maxlen = sizeof(percpu_pagelist_fraction),
1195 .mode = 0644,
6d456111 1196 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
8ad4b1fb
RS		 1197 .extra1 = &min_percpu_pagelist_fract,
1198 },
1da177e4
LT		 1199#ifdef CONFIG_MMU
1200 {
1da177e4
LT		 1201 .procname = "max_map_count",
1202 .data = &sysctl_max_map_count,
1203 .maxlen = sizeof(sysctl_max_map_count),
1204 .mode = 0644,
3e26120c 1205 .proc_handler = proc_dointvec_minmax,
70da2340 1206 .extra1 = &zero,
1da177e4 1207 },
dd8632a1
PM		 1208#else
1209 {
dd8632a1
PM		 1210 .procname = "nr_trim_pages",
1211 .data = &sysctl_nr_trim_pages,
1212 .maxlen = sizeof(sysctl_nr_trim_pages),
1213 .mode = 0644,
6d456111 1214 .proc_handler = proc_dointvec_minmax,
dd8632a1
PM		 1215 .extra1 = &zero,
1216 },
1da177e4
LT		 1217#endif
1218 {
1da177e4
LT		 1219 .procname = "laptop_mode",
1220 .data = &laptop_mode,
1221 .maxlen = sizeof(laptop_mode),
1222 .mode = 0644,
6d456111 1223 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 1224 },
1225 {
1da177e4
LT		 1226 .procname = "block_dump",
1227 .data = &block_dump,
1228 .maxlen = sizeof(block_dump),
1229 .mode = 0644,
6d456111 1230 .proc_handler = proc_dointvec,
1da177e4
LT		 1231 .extra1 = &zero,
1232 },
1233 {
1da177e4
LT		 1234 .procname = "vfs_cache_pressure",
1235 .data = &sysctl_vfs_cache_pressure,
1236 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1237 .mode = 0644,
6d456111 1238 .proc_handler = proc_dointvec,
1da177e4
LT		 1239 .extra1 = &zero,
1240 },
1241#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1242 {
1da177e4
LT		 1243 .procname = "legacy_va_layout",
1244 .data = &sysctl_legacy_va_layout,
1245 .maxlen = sizeof(sysctl_legacy_va_layout),
1246 .mode = 0644,
6d456111 1247 .proc_handler = proc_dointvec,
1da177e4
LT		 1248 .extra1 = &zero,
1249 },
1250#endif
1743660b
CL		 1251#ifdef CONFIG_NUMA
1252 {
1743660b
CL		 1253 .procname = "zone_reclaim_mode",
1254 .data = &zone_reclaim_mode,
1255 .maxlen = sizeof(zone_reclaim_mode),
1256 .mode = 0644,
6d456111 1257 .proc_handler = proc_dointvec,
c84db23c 1258 .extra1 = &zero,
1743660b 1259 },
9614634f 1260 {
9614634f
CL		 1261 .procname = "min_unmapped_ratio",
1262 .data = &sysctl_min_unmapped_ratio,
1263 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1264 .mode = 0644,
6d456111 1265 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
9614634f
CL		 1266 .extra1 = &zero,
1267 .extra2 = &one_hundred,
1268 },
0ff38490 1269 {
0ff38490
CL		 1270 .procname = "min_slab_ratio",
1271 .data = &sysctl_min_slab_ratio,
1272 .maxlen = sizeof(sysctl_min_slab_ratio),
1273 .mode = 0644,
6d456111 1274 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
0ff38490
CL		 1275 .extra1 = &zero,
1276 .extra2 = &one_hundred,
1277 },
e6e5494c 1278#endif
77461ab3
CL		 1279#ifdef CONFIG_SMP
1280 {
77461ab3
CL		 1281 .procname = "stat_interval",
1282 .data = &sysctl_stat_interval,
1283 .maxlen = sizeof(sysctl_stat_interval),
1284 .mode = 0644,
6d456111 1285 .proc_handler = proc_dointvec_jiffies,
77461ab3
CL		 1286 },
1287#endif
6e141546 1288#ifdef CONFIG_MMU
ed032189 1289 {
ed032189 1290 .procname = "mmap_min_addr",
788084ab
EP		 1291 .data = &dac_mmap_min_addr,
1292 .maxlen = sizeof(unsigned long),
ed032189 1293 .mode = 0644,
6d456111 1294 .proc_handler = mmap_min_addr_handler,
ed032189 1295 },
6e141546 1296#endif
f0c0b2b8
KH		 1297#ifdef CONFIG_NUMA
1298 {
f0c0b2b8
KH		 1299 .procname = "numa_zonelist_order",
1300 .data = &numa_zonelist_order,
1301 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1302 .mode = 0644,
6d456111 1303 .proc_handler = numa_zonelist_order_handler,
f0c0b2b8
KH		 1304 },
1305#endif
2b8232ce 1306#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1307 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c 1308 {
e6e5494c
IM		 1309 .procname = "vdso_enabled",
1310 .data = &vdso_enabled,
1311 .maxlen = sizeof(vdso_enabled),
1312 .mode = 0644,
6d456111 1313 .proc_handler = proc_dointvec,
e6e5494c
IM		 1314 .extra1 = &zero,
1315 },
1da177e4 1316#endif
195cf453
BG		 1317#ifdef CONFIG_HIGHMEM
1318 {
195cf453
BG		 1319 .procname = "highmem_is_dirtyable",
1320 .data = &vm_highmem_is_dirtyable,
1321 .maxlen = sizeof(vm_highmem_is_dirtyable),
1322 .mode = 0644,
6d456111 1323 .proc_handler = proc_dointvec_minmax,
195cf453
BG		 1324 .extra1 = &zero,
1325 .extra2 = &one,
1326 },
1327#endif
4be6f6bb 1328 {
4be6f6bb
PZ		 1329 .procname = "scan_unevictable_pages",
1330 .data = &scan_unevictable_pages,
1331 .maxlen = sizeof(scan_unevictable_pages),
1332 .mode = 0644,
6d456111 1333 .proc_handler = scan_unevictable_handler,
4be6f6bb 1334 },
6a46079c
AK		 1335#ifdef CONFIG_MEMORY_FAILURE
1336 {
6a46079c
AK		 1337 .procname = "memory_failure_early_kill",
1338 .data = &sysctl_memory_failure_early_kill,
1339 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1340 .mode = 0644,
6d456111 1341 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1342 .extra1 = &zero,
1343 .extra2 = &one,
1344 },
1345 {
6a46079c
AK		 1346 .procname = "memory_failure_recovery",
1347 .data = &sysctl_memory_failure_recovery,
1348 .maxlen = sizeof(sysctl_memory_failure_recovery),
1349 .mode = 0644,
6d456111 1350 .proc_handler = proc_dointvec_minmax,
6a46079c
AK		 1351 .extra1 = &zero,
1352 .extra2 = &one,
1353 },
1354#endif
6fce56ec 1355 { }
1da177e4
LT		 1356};
1357
2abc26fc 1358#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1359static struct ctl_table binfmt_misc_table[] = {
6fce56ec 1360 { }
2abc26fc
EB		 1361};
1362#endif
1363
d8217f07 1364static struct ctl_table fs_table[] = {
1da177e4 1365 {
1da177e4
LT		 1366 .procname = "inode-nr",
1367 .data = &inodes_stat,
1368 .maxlen = 2*sizeof(int),
1369 .mode = 0444,
cffbc8aa 1370 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1371 },
1372 {
1da177e4
LT		 1373 .procname = "inode-state",
1374 .data = &inodes_stat,
1375 .maxlen = 7*sizeof(int),
1376 .mode = 0444,
cffbc8aa 1377 .proc_handler = proc_nr_inodes,
1da177e4
LT		 1378 },
1379 {
1da177e4
LT		 1380 .procname = "file-nr",
1381 .data = &files_stat,
518de9b3 1382 .maxlen = sizeof(files_stat),
1da177e4 1383 .mode = 0444,
6d456111 1384 .proc_handler = proc_nr_files,
1da177e4
LT		 1385 },
1386 {
1da177e4
LT		 1387 .procname = "file-max",
1388 .data = &files_stat.max_files,
518de9b3 1389 .maxlen = sizeof(files_stat.max_files),
1da177e4 1390 .mode = 0644,
518de9b3 1391 .proc_handler = proc_doulongvec_minmax,
1da177e4 1392 },
9cfe015a 1393 {
9cfe015a
ED		 1394 .procname = "nr_open",
1395 .data = &sysctl_nr_open,
1396 .maxlen = sizeof(int),
1397 .mode = 0644,
6d456111 1398 .proc_handler = proc_dointvec_minmax,
eceea0b3
AV		 1399 .extra1 = &sysctl_nr_open_min,
1400 .extra2 = &sysctl_nr_open_max,
9cfe015a 1401 },
1da177e4 1402 {
1da177e4
LT		 1403 .procname = "dentry-state",
1404 .data = &dentry_stat,
1405 .maxlen = 6*sizeof(int),
1406 .mode = 0444,
312d3ca8 1407 .proc_handler = proc_nr_dentry,
1da177e4
LT		 1408 },
1409 {
1da177e4
LT		 1410 .procname = "overflowuid",
1411 .data = &fs_overflowuid,
1412 .maxlen = sizeof(int),
1413 .mode = 0644,
6d456111 1414 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1415 .extra1 = &minolduid,
1416 .extra2 = &maxolduid,
1417 },
1418 {
1da177e4
LT		 1419 .procname = "overflowgid",
1420 .data = &fs_overflowgid,
1421 .maxlen = sizeof(int),
1422 .mode = 0644,
6d456111 1423 .proc_handler = proc_dointvec_minmax,
1da177e4
LT		 1424 .extra1 = &minolduid,
1425 .extra2 = &maxolduid,
1426 },
bfcd17a6 1427#ifdef CONFIG_FILE_LOCKING
1da177e4 1428 {
1da177e4
LT		 1429 .procname = "leases-enable",
1430 .data = &leases_enable,
1431 .maxlen = sizeof(int),
1432 .mode = 0644,
6d456111 1433 .proc_handler = proc_dointvec,
1da177e4 1434 },
bfcd17a6 1435#endif
1da177e4
LT		 1436#ifdef CONFIG_DNOTIFY
1437 {
1da177e4
LT		 1438 .procname = "dir-notify-enable",
1439 .data = &dir_notify_enable,
1440 .maxlen = sizeof(int),
1441 .mode = 0644,
6d456111 1442 .proc_handler = proc_dointvec,
1da177e4
LT		 1443 },
1444#endif
1445#ifdef CONFIG_MMU
bfcd17a6 1446#ifdef CONFIG_FILE_LOCKING
1da177e4 1447 {
1da177e4
LT		 1448 .procname = "lease-break-time",
1449 .data = &lease_break_time,
1450 .maxlen = sizeof(int),
1451 .mode = 0644,
6d456111 1452 .proc_handler = proc_dointvec,
1da177e4 1453 },
bfcd17a6 1454#endif
ebf3f09c 1455#ifdef CONFIG_AIO
1da177e4 1456 {
1da177e4
LT		 1457 .procname = "aio-nr",
1458 .data = &aio_nr,
1459 .maxlen = sizeof(aio_nr),
1460 .mode = 0444,
6d456111 1461 .proc_handler = proc_doulongvec_minmax,
1da177e4
LT		 1462 },
1463 {
1da177e4
LT		 1464 .procname = "aio-max-nr",
1465 .data = &aio_max_nr,
1466 .maxlen = sizeof(aio_max_nr),
1467 .mode = 0644,
6d456111 1468 .proc_handler = proc_doulongvec_minmax,
1da177e4 1469 },
ebf3f09c 1470#endif /* CONFIG_AIO */
2d9048e2 1471#ifdef CONFIG_INOTIFY_USER
0399cb08 1472 {
0399cb08
RL		 1473 .procname = "inotify",
1474 .mode = 0555,
1475 .child = inotify_table,
1476 },
1477#endif
7ef9964e
DL		 1478#ifdef CONFIG_EPOLL
1479 {
1480 .procname = "epoll",
1481 .mode = 0555,
1482 .child = epoll_table,
1483 },
1484#endif
1da177e4 1485#endif
d6e71144 1486 {
d6e71144
AC		 1487 .procname = "suid_dumpable",
1488 .data = &suid_dumpable,
1489 .maxlen = sizeof(int),
1490 .mode = 0644,
6d456111 1491 .proc_handler = proc_dointvec_minmax,
8e654fba
MW		 1492 .extra1 = &zero,
1493 .extra2 = &two,
d6e71144 1494 },
2abc26fc
EB		 1495#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1496 {
2abc26fc
EB		 1497 .procname = "binfmt_misc",
1498 .mode = 0555,
1499 .child = binfmt_misc_table,
1500 },
1501#endif
b492e95b 1502 {
ff9da691
JA		 1503 .procname = "pipe-max-size",
1504 .data = &pipe_max_size,
b492e95b
JA		 1505 .maxlen = sizeof(int),
1506 .mode = 0644,
ff9da691
JA		 1507 .proc_handler = &pipe_proc_fn,
1508 .extra1 = &pipe_min_size,
b492e95b 1509 },
6fce56ec 1510 { }
1da177e4
LT		 1511};
1512
d8217f07 1513static struct ctl_table debug_table[] = {
ab3c68ee 1514#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
571d76ac 1515 defined(CONFIG_S390) || defined(CONFIG_TILE)
abd4f750 1516 {
abd4f750
MAS		 1517 .procname = "exception-trace",
1518 .data = &show_unhandled_signals,
1519 .maxlen = sizeof(int),
1520 .mode = 0644,
1521 .proc_handler = proc_dointvec
1522 },
b2be84df
MH		 1523#endif
1524#if defined(CONFIG_OPTPROBES)
1525 {
1526 .procname = "kprobes-optimization",
1527 .data = &sysctl_kprobes_optimization,
1528 .maxlen = sizeof(int),
1529 .mode = 0644,
1530 .proc_handler = proc_kprobes_optimization_handler,
1531 .extra1 = &zero,
1532 .extra2 = &one,
1533 },
abd4f750 1534#endif
6fce56ec 1535 { }
1da177e4
LT		 1536};
1537
d8217f07 1538static struct ctl_table dev_table[] = {
6fce56ec 1539 { }
0eeca283 1540};
1da177e4 1541
330d57fb
AV		 1542static DEFINE_SPINLOCK(sysctl_lock);
1543
1544/* called under sysctl_lock */
1545static int use_table(struct ctl_table_header *p)
1546{
1547 if (unlikely(p->unregistering))
1548 return 0;
1549 p->used++;
1550 return 1;
1551}
1552
1553/* called under sysctl_lock */
1554static void unuse_table(struct ctl_table_header *p)
1555{
1556 if (!--p->used)
1557 if (unlikely(p->unregistering))
1558 complete(p->unregistering);
1559}
1560
1561/* called under sysctl_lock, will reacquire if has to wait */
1562static void start_unregistering(struct ctl_table_header *p)
1563{
1564 /*
1565 * if p->used is 0, nobody will ever touch that entry again;
1566 * we'll eliminate all paths to it before dropping sysctl_lock
1567 */
1568 if (unlikely(p->used)) {
1569 struct completion wait;
1570 init_completion(&wait);
1571 p->unregistering = &wait;
1572 spin_unlock(&sysctl_lock);
1573 wait_for_completion(&wait);
1574 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1575 } else {
1576 /* anything non-NULL; we'll never dereference it */
1577 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1578 }
1579 /*
1580 * do not remove from the list until nobody holds it; walking the
1581 * list in do_sysctl() relies on that.
1582 */
1583 list_del_init(&p->ctl_entry);
1584}
1585
f7e6ced4
AV		 1586void sysctl_head_get(struct ctl_table_header *head)
1587{
1588 spin_lock(&sysctl_lock);
1589 head->count++;
1590 spin_unlock(&sysctl_lock);
1591}
1592
dfef6dcd
AV		 1593static void free_head(struct rcu_head *rcu)
1594{
1595 kfree(container_of(rcu, struct ctl_table_header, rcu));
1596}
1597
f7e6ced4
AV		 1598void sysctl_head_put(struct ctl_table_header *head)
1599{
1600 spin_lock(&sysctl_lock);
1601 if (!--head->count)
dfef6dcd 1602 call_rcu(&head->rcu, free_head);
f7e6ced4
AV		 1603 spin_unlock(&sysctl_lock);
1604}
1605
1606struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1607{
1608 if (!head)
1609 BUG();
1610 spin_lock(&sysctl_lock);
1611 if (!use_table(head))
1612 head = ERR_PTR(-ENOENT);
1613 spin_unlock(&sysctl_lock);
1614 return head;
1615}
1616
805b5d5e
EB		 1617void sysctl_head_finish(struct ctl_table_header *head)
1618{
1619 if (!head)
1620 return;
1621 spin_lock(&sysctl_lock);
1622 unuse_table(head);
1623 spin_unlock(&sysctl_lock);
1624}
1625
73455092
AV		 1626static struct ctl_table_set *
1627lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1628{
1629 struct ctl_table_set *set = &root->default_set;
1630 if (root->lookup)
1631 set = root->lookup(root, namespaces);
1632 return set;
1633}
1634
e51b6ba0
EB		 1635static struct list_head *
1636lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1637{
73455092
AV		 1638 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1639 return &set->list;
e51b6ba0
EB		 1640}
1641
1642struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1643 struct ctl_table_header *prev)
1644{
1645 struct ctl_table_root *root;
1646 struct list_head *header_list;
805b5d5e
EB		 1647 struct ctl_table_header *head;
1648 struct list_head *tmp;
e51b6ba0 1649
805b5d5e
EB		 1650 spin_lock(&sysctl_lock);
1651 if (prev) {
e51b6ba0 1652 head = prev;
805b5d5e
EB		 1653 tmp = &prev->ctl_entry;
1654 unuse_table(prev);
1655 goto next;
1656 }
1657 tmp = &root_table_header.ctl_entry;
1658 for (;;) {
1659 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1660
1661 if (!use_table(head))
1662 goto next;
1663 spin_unlock(&sysctl_lock);
1664 return head;
1665 next:
e51b6ba0 1666 root = head->root;
805b5d5e 1667 tmp = tmp->next;
e51b6ba0
EB		 1668 header_list = lookup_header_list(root, namespaces);
1669 if (tmp != header_list)
1670 continue;
1671
1672 do {
1673 root = list_entry(root->root_list.next,
1674 struct ctl_table_root, root_list);
1675 if (root == &sysctl_table_root)
1676 goto out;
1677 header_list = lookup_header_list(root, namespaces);
1678 } while (list_empty(header_list));
1679 tmp = header_list->next;
805b5d5e 1680 }
e51b6ba0 1681out:
805b5d5e
EB		 1682 spin_unlock(&sysctl_lock);
1683 return NULL;
1684}
1685
e51b6ba0
EB		 1686struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1687{
1688 return __sysctl_head_next(current->nsproxy, prev);
1689}
1690
1691void register_sysctl_root(struct ctl_table_root *root)
1692{
1693 spin_lock(&sysctl_lock);
1694 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1695 spin_unlock(&sysctl_lock);
1696}
1697
1da177e4 1698/*
1ff007eb 1699 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1700 * some sysctl variables are readonly even to root.
1701 */
1702
1703static int test_perm(int mode, int op)
1704{
76aac0e9 1705 if (!current_euid())
1da177e4
LT		 1706 mode >>= 6;
1707 else if (in_egroup_p(0))
1708 mode >>= 3;
e6305c43 1709 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1710 return 0;
1711 return -EACCES;
1712}
1713
d7321cd6 1714int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4 1715{
d7321cd6
PE		 1716 int mode;
1717
d7321cd6
PE		 1718 if (root->permissions)
1719 mode = root->permissions(root, current->nsproxy, table);
1720 else
1721 mode = table->mode;
1722
1723 return test_perm(mode, op);
1da177e4
LT		 1724}
1725
d912b0cc
EB		 1726static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1727{
2315ffa0 1728 for (; table->procname; table++) {
d912b0cc
EB		 1729 table->parent = parent;
1730 if (table->child)
1731 sysctl_set_parent(table, table->child);
1732 }
1733}
1734
1735static __init int sysctl_init(void)
1736{
1737 sysctl_set_parent(NULL, root_table);
88f458e4 1738#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
b3bd3de6 1739 sysctl_check_table(current->nsproxy, root_table);
88f458e4 1740#endif
d912b0cc
EB		 1741 return 0;
1742}
1743
1744core_initcall(sysctl_init);
1745
bfbcf034
AV		 1746static struct ctl_table *is_branch_in(struct ctl_table *branch,
1747 struct ctl_table *table)
ae7edecc
AV		 1748{
1749 struct ctl_table *p;
1750 const char *s = branch->procname;
1751
1752 /* branch should have named subdirectory as its first element */
1753 if (!s || !branch->child)
bfbcf034 1754 return NULL;
ae7edecc
AV		 1755
1756 /* ... and nothing else */
2315ffa0 1757 if (branch[1].procname)
bfbcf034 1758 return NULL;
ae7edecc
AV		 1759
1760 /* table should contain subdirectory with the same name */
2315ffa0 1761 for (p = table; p->procname; p++) {
ae7edecc
AV		 1762 if (!p->child)
1763 continue;
1764 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1765 return p;
ae7edecc 1766 }
bfbcf034 1767 return NULL;
ae7edecc
AV		 1768}
1769
1770/* see if attaching q to p would be an improvement */
1771static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1772{
1773 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1774 struct ctl_table *next;
ae7edecc
AV		 1775 int is_better = 0;
1776 int not_in_parent = !p->attached_by;
1777
bfbcf034 1778 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1779 if (by == q->attached_by)
1780 is_better = 1;
1781 if (to == p->attached_by)
1782 not_in_parent = 1;
1783 by = by->child;
bfbcf034 1784 to = next->child;
ae7edecc
AV		 1785 }
1786
1787 if (is_better && not_in_parent) {
1788 q->attached_by = by;
1789 q->attached_to = to;
1790 q->parent = p;
1791 }
1792}
1793
1da177e4 1794/**
e51b6ba0
EB		 1795 * __register_sysctl_paths - register a sysctl hierarchy
1796 * @root: List of sysctl headers to register on
1797 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1798 * @path: The path to the directory the sysctl table is in.
1da177e4 1799 * @table: the top-level table structure
1da177e4
LT		 1800 *
1801 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1802 * array. A completely 0 filled entry terminates the table.
1da177e4 1803 *
d8217f07 1804 * The members of the &struct ctl_table structure are used as follows:
1da177e4 1805 *
1da177e4
LT		 1806 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1807 * enter a sysctl file
1808 *
1809 * data - a pointer to data for use by proc_handler
1810 *
1811 * maxlen - the maximum size in bytes of the data
1812 *
1813 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1814 *
1815 * child - a pointer to the child sysctl table if this entry is a directory, or
1816 * %NULL.
1817 *
1818 * proc_handler - the text handler routine (described below)
1819 *
1da177e4
LT		 1820 * de - for internal use by the sysctl routines
1821 *
1822 * extra1, extra2 - extra pointers usable by the proc handler routines
1823 *
1824 * Leaf nodes in the sysctl tree will be represented by a single file
1825 * under /proc; non-leaf nodes will be represented by directories.
1826 *
1827 * sysctl(2) can automatically manage read and write requests through
1828 * the sysctl table. The data and maxlen fields of the ctl_table
1829 * struct enable minimal validation of the values being written to be
1830 * performed, and the mode field allows minimal authentication.
1831 *
1da177e4
LT		 1832 * There must be a proc_handler routine for any terminal nodes
1833 * mirrored under /proc/sys (non-terminals are handled by a built-in
1834 * directory handler). Several default handlers are available to
1835 * cover common cases -
1836 *
1837 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1838 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1839 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1840 *
1841 * It is the handler's job to read the input buffer from user memory
1842 * and process it. The handler should return 0 on success.
1843 *
1844 * This routine returns %NULL on a failure to register, and a pointer
1845 * to the table header on success.
1846 */
e51b6ba0
EB		 1847struct ctl_table_header *__register_sysctl_paths(
1848 struct ctl_table_root *root,
1849 struct nsproxy *namespaces,
1850 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1851{
29e796fd
EB		 1852 struct ctl_table_header *header;
1853 struct ctl_table *new, **prevp;
1854 unsigned int n, npath;
ae7edecc 1855 struct ctl_table_set *set;
29e796fd
EB		 1856
1857 /* Count the path components */
2315ffa0 1858 for (npath = 0; path[npath].procname; ++npath)
29e796fd
EB		 1859 ;
1860
1861 /*
1862 * For each path component, allocate a 2-element ctl_table array.
1863 * The first array element will be filled with the sysctl entry
2315ffa0 1864 * for this, the second will be the sentinel (procname == 0).
29e796fd
EB		 1865 *
1866 * We allocate everything in one go so that we don't have to
1867 * worry about freeing additional memory in unregister_sysctl_table.
1868 */
1869 header = kzalloc(sizeof(struct ctl_table_header) +
1870 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1871 if (!header)
1da177e4 1872 return NULL;
29e796fd
EB		 1873
1874 new = (struct ctl_table *) (header + 1);
1875
1876 /* Now connect the dots */
1877 prevp = &header->ctl_table;
1878 for (n = 0; n < npath; ++n, ++path) {
1879 /* Copy the procname */
1880 new->procname = path->procname;
29e796fd
EB		 1881 new->mode = 0555;
1882
1883 *prevp = new;
1884 prevp = &new->child;
1885
1886 new += 2;
1887 }
1888 *prevp = table;
23eb06de 1889 header->ctl_table_arg = table;
29e796fd
EB		 1890
1891 INIT_LIST_HEAD(&header->ctl_entry);
1892 header->used = 0;
1893 header->unregistering = NULL;
e51b6ba0 1894 header->root = root;
29e796fd 1895 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1896 header->count = 1;
88f458e4 1897#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1898 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1899 kfree(header);
fc6cd25b
EB		 1900 return NULL;
1901 }
88f458e4 1902#endif
330d57fb 1903 spin_lock(&sysctl_lock);
73455092 1904 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 1905 header->attached_by = header->ctl_table;
1906 header->attached_to = root_table;
1907 header->parent = &root_table_header;
1908 for (set = header->set; set; set = set->parent) {
1909 struct ctl_table_header *p;
1910 list_for_each_entry(p, &set->list, ctl_entry) {
1911 if (p->unregistering)
1912 continue;
1913 try_attach(p, header);
1914 }
1915 }
1916 header->parent->count++;
73455092 1917 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 1918 spin_unlock(&sysctl_lock);
29e796fd
EB		 1919
1920 return header;
1921}
1922
e51b6ba0
EB		 1923/**
1924 * register_sysctl_table_path - register a sysctl table hierarchy
1925 * @path: The path to the directory the sysctl table is in.
1926 * @table: the top-level table structure
1927 *
1928 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1929 * array. A completely 0 filled entry terminates the table.
1930 *
1931 * See __register_sysctl_paths for more details.
1932 */
1933struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1934 struct ctl_table *table)
1935{
1936 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1937 path, table);
1938}
1939
29e796fd
EB		 1940/**
1941 * register_sysctl_table - register a sysctl table hierarchy
1942 * @table: the top-level table structure
1943 *
1944 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1945 * array. A completely 0 filled entry terminates the table.
1946 *
1947 * See register_sysctl_paths for more details.
1948 */
1949struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1950{
1951 static const struct ctl_path null_path[] = { {} };
1952
1953 return register_sysctl_paths(null_path, table);
1da177e4
LT		 1954}
1955
1956/**
1957 * unregister_sysctl_table - unregister a sysctl table hierarchy
1958 * @header: the header returned from register_sysctl_table
1959 *
1960 * Unregisters the sysctl table and all children. proc entries may not
1961 * actually be removed until they are no longer used by anyone.
1962 */
1963void unregister_sysctl_table(struct ctl_table_header * header)
1964{
330d57fb 1965 might_sleep();
f1dad166
PE		 1966
1967 if (header == NULL)
1968 return;
1969
330d57fb
AV		 1970 spin_lock(&sysctl_lock);
1971 start_unregistering(header);
ae7edecc
AV		 1972 if (!--header->parent->count) {
1973 WARN_ON(1);
dfef6dcd 1974 call_rcu(&header->parent->rcu, free_head);
ae7edecc 1975 }
f7e6ced4 1976 if (!--header->count)
dfef6dcd 1977 call_rcu(&header->rcu, free_head);
330d57fb 1978 spin_unlock(&sysctl_lock);
1da177e4
LT		 1979}
1980
9043476f
AV		 1981int sysctl_is_seen(struct ctl_table_header *p)
1982{
1983 struct ctl_table_set *set = p->set;
1984 int res;
1985 spin_lock(&sysctl_lock);
1986 if (p->unregistering)
1987 res = 0;
1988 else if (!set->is_seen)
1989 res = 1;
1990 else
1991 res = set->is_seen(set);
1992 spin_unlock(&sysctl_lock);
1993 return res;
1994}
1995
73455092
AV		 1996void setup_sysctl_set(struct ctl_table_set *p,
1997 struct ctl_table_set *parent,
1998 int (*is_seen)(struct ctl_table_set *))
1999{
2000 INIT_LIST_HEAD(&p->list);
2001 p->parent = parent ? parent : &sysctl_table_root.default_set;
2002 p->is_seen = is_seen;
2003}
2004
b89a8171 2005#else /* !CONFIG_SYSCTL */
d8217f07 2006struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2007{
2008 return NULL;
2009}
2010
29e796fd
EB		 2011struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2012 struct ctl_table *table)
2013{
2014 return NULL;
2015}
2016
b89a8171
EB		 2017void unregister_sysctl_table(struct ctl_table_header * table)
2018{
2019}
2020
73455092
AV		 2021void setup_sysctl_set(struct ctl_table_set *p,
2022 struct ctl_table_set *parent,
2023 int (*is_seen)(struct ctl_table_set *))
2024{
2025}
2026
f7e6ced4
AV		 2027void sysctl_head_put(struct ctl_table_header *head)
2028{
2029}
2030
b89a8171
EB		 2031#endif /* CONFIG_SYSCTL */
2032
1da177e4
LT		 2033/*
2034 * /proc/sys support
2035 */
2036
b89a8171 2037#ifdef CONFIG_PROC_SYSCTL
1da177e4 2038
b1ba4ddd 2039static int _proc_do_string(void* data, int maxlen, int write,
8d65af78 2040 void __user *buffer,
b1ba4ddd 2041 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2042{
2043 size_t len;
2044 char __user *p;
2045 char c;
8d060877
ON		 2046
2047 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2048 *lenp = 0;
2049 return 0;
2050 }
8d060877 2051
1da177e4
LT		 2052 if (write) {
2053 len = 0;
2054 p = buffer;
2055 while (len < *lenp) {
2056 if (get_user(c, p++))
2057 return -EFAULT;
2058 if (c == 0 || c == '\n')
2059 break;
2060 len++;
2061 }
f5dd3d6f
SV		 2062 if (len >= maxlen)
2063 len = maxlen-1;
2064 if(copy_from_user(data, buffer, len))
1da177e4 2065 return -EFAULT;
f5dd3d6f 2066 ((char *) data)[len] = 0;
1da177e4
LT		 2067 *ppos += *lenp;
2068 } else {
f5dd3d6f
SV		 2069 len = strlen(data);
2070 if (len > maxlen)
2071 len = maxlen;
8d060877
ON		 2072
2073 if (*ppos > len) {
2074 *lenp = 0;
2075 return 0;
2076 }
2077
2078 data += *ppos;
2079 len -= *ppos;
2080
1da177e4
LT		 2081 if (len > *lenp)
2082 len = *lenp;
2083 if (len)
f5dd3d6f 2084 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2085 return -EFAULT;
2086 if (len < *lenp) {
2087 if(put_user('\n', ((char __user *) buffer) + len))
2088 return -EFAULT;
2089 len++;
2090 }
2091 *lenp = len;
2092 *ppos += len;
2093 }
2094 return 0;
2095}
2096
f5dd3d6f
SV		 2097/**
2098 * proc_dostring - read a string sysctl
2099 * @table: the sysctl table
2100 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 2101 * @buffer: the user buffer
2102 * @lenp: the size of the user buffer
2103 * @ppos: file position
2104 *
2105 * Reads/writes a string from/to the user buffer. If the kernel
2106 * buffer provided is not large enough to hold the string, the
2107 * string is truncated. The copied string is %NULL-terminated.
2108 * If the string is being read by the user process, it is copied
2109 * and a newline '\n' is added. It is truncated if the buffer is
2110 * not large enough.
2111 *
2112 * Returns 0 on success.
2113 */
8d65af78 2114int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 2115 void __user *buffer, size_t *lenp, loff_t *ppos)
2116{
8d65af78 2117 return _proc_do_string(table->data, table->maxlen, write,
f5dd3d6f
SV		 2118 buffer, lenp, ppos);
2119}
2120
00b7c339
AW		 2121static size_t proc_skip_spaces(char **buf)
2122{
2123 size_t ret;
2124 char *tmp = skip_spaces(*buf);
2125 ret = tmp - *buf;
2126 *buf = tmp;
2127 return ret;
2128}
2129
9f977fb7
OP		 2130static void proc_skip_char(char **buf, size_t *size, const char v)
2131{
2132 while (*size) {
2133 if (**buf != v)
2134 break;
2135 (*size)--;
2136 (*buf)++;
2137 }
2138}
2139
00b7c339
AW		 2140#define TMPBUFLEN 22
2141/**
0fc377bd 2142 * proc_get_long - reads an ASCII formatted integer from a user buffer
00b7c339 2143 *
0fc377bd
RD		 2144 * @buf: a kernel buffer
2145 * @size: size of the kernel buffer
2146 * @val: this is where the number will be stored
2147 * @neg: set to %TRUE if number is negative
2148 * @perm_tr: a vector which contains the allowed trailers
2149 * @perm_tr_len: size of the perm_tr vector
2150 * @tr: pointer to store the trailer character
00b7c339 2151 *
0fc377bd
RD		 2152 * In case of success %0 is returned and @buf and @size are updated with
2153 * the amount of bytes read. If @tr is non-NULL and a trailing
2154 * character exists (size is non-zero after returning from this
2155 * function), @tr is updated with the trailing character.
00b7c339
AW		 2156 */
2157static int proc_get_long(char **buf, size_t *size,
2158 unsigned long *val, bool *neg,
2159 const char *perm_tr, unsigned perm_tr_len, char *tr)
2160{
2161 int len;
2162 char *p, tmp[TMPBUFLEN];
2163
2164 if (!*size)
2165 return -EINVAL;
2166
2167 len = *size;
2168 if (len > TMPBUFLEN - 1)
2169 len = TMPBUFLEN - 1;
2170
2171 memcpy(tmp, *buf, len);
2172
2173 tmp[len] = 0;
2174 p = tmp;
2175 if (*p == '-' && *size > 1) {
2176 *neg = true;
2177 p++;
2178 } else
2179 *neg = false;
2180 if (!isdigit(*p))
2181 return -EINVAL;
2182
2183 *val = simple_strtoul(p, &p, 0);
2184
2185 len = p - tmp;
2186
2187 /* We don't know if the next char is whitespace thus we may accept
2188 * invalid integers (e.g. 1234...a) or two integers instead of one
2189 * (e.g. 123...1). So lets not allow such large numbers. */
2190 if (len == TMPBUFLEN - 1)
2191 return -EINVAL;
2192
2193 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2194 return -EINVAL;
1da177e4 2195
00b7c339
AW		 2196 if (tr && (len < *size))
2197 *tr = *p;
2198
2199 *buf += len;
2200 *size -= len;
2201
2202 return 0;
2203}
2204
2205/**
0fc377bd 2206 * proc_put_long - converts an integer to a decimal ASCII formatted string
00b7c339 2207 *
0fc377bd
RD		 2208 * @buf: the user buffer
2209 * @size: the size of the user buffer
2210 * @val: the integer to be converted
2211 * @neg: sign of the number, %TRUE for negative
00b7c339 2212 *
0fc377bd
RD		 2213 * In case of success %0 is returned and @buf and @size are updated with
2214 * the amount of bytes written.
00b7c339
AW		 2215 */
2216static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2217 bool neg)
2218{
2219 int len;
2220 char tmp[TMPBUFLEN], *p = tmp;
2221
2222 sprintf(p, "%s%lu", neg ? "-" : "", val);
2223 len = strlen(tmp);
2224 if (len > *size)
2225 len = *size;
2226 if (copy_to_user(*buf, tmp, len))
2227 return -EFAULT;
2228 *size -= len;
2229 *buf += len;
2230 return 0;
2231}
2232#undef TMPBUFLEN
2233
2234static int proc_put_char(void __user **buf, size_t *size, char c)
2235{
2236 if (*size) {
2237 char __user **buffer = (char __user **)buf;
2238 if (put_user(c, *buffer))
2239 return -EFAULT;
2240 (*size)--, (*buffer)++;
2241 *buf = *buffer;
2242 }
2243 return 0;
2244}
1da177e4 2245
00b7c339 2246static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2247 int *valp,
2248 int write, void *data)
2249{
2250 if (write) {
2251 *valp = *negp ? -*lvalp : *lvalp;
2252 } else {
2253 int val = *valp;
2254 if (val < 0) {
00b7c339 2255 *negp = true;
1da177e4
LT		 2256 *lvalp = (unsigned long)-val;
2257 } else {
00b7c339 2258 *negp = false;
1da177e4
LT		 2259 *lvalp = (unsigned long)val;
2260 }
2261 }
2262 return 0;
2263}
2264
00b7c339
AW		 2265static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2266
d8217f07 2267static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2268 int write, void __user *buffer,
fcfbd547 2269 size_t *lenp, loff_t *ppos,
00b7c339 2270 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1da177e4
LT		 2271 int write, void *data),
2272 void *data)
2273{
00b7c339
AW		 2274 int *i, vleft, first = 1, err = 0;
2275 unsigned long page = 0;
2276 size_t left;
2277 char *kbuf;
1da177e4 2278
00b7c339 2279 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2280 *lenp = 0;
2281 return 0;
2282 }
2283
fcfbd547 2284 i = (int *) tbl_data;
1da177e4
LT		 2285 vleft = table->maxlen / sizeof(*i);
2286 left = *lenp;
2287
2288 if (!conv)
2289 conv = do_proc_dointvec_conv;
2290
00b7c339
AW		 2291 if (write) {
2292 if (left > PAGE_SIZE - 1)
2293 left = PAGE_SIZE - 1;
2294 page = __get_free_page(GFP_TEMPORARY);
2295 kbuf = (char *) page;
2296 if (!kbuf)
2297 return -ENOMEM;
2298 if (copy_from_user(kbuf, buffer, left)) {
2299 err = -EFAULT;
2300 goto free;
2301 }
2302 kbuf[left] = 0;
2303 }
2304
1da177e4 2305 for (; left && vleft--; i++, first=0) {
00b7c339
AW		 2306 unsigned long lval;
2307 bool neg;
1da177e4 2308
00b7c339
AW		 2309 if (write) {
2310 left -= proc_skip_spaces(&kbuf);
1da177e4 2311
563b0467
O		 2312 if (!left)
2313 break;
00b7c339
AW		 2314 err = proc_get_long(&kbuf, &left, &lval, &neg,
2315 proc_wspace_sep,
2316 sizeof(proc_wspace_sep), NULL);
2317 if (err)
1da177e4 2318 break;
00b7c339
AW		 2319 if (conv(&neg, &lval, i, 1, data)) {
2320 err = -EINVAL;
1da177e4 2321 break;
00b7c339 2322 }
1da177e4 2323 } else {
00b7c339
AW		 2324 if (conv(&neg, &lval, i, 0, data)) {
2325 err = -EINVAL;
2326 break;
2327 }
1da177e4 2328 if (!first)
00b7c339
AW		 2329 err = proc_put_char(&buffer, &left, '\t');
2330 if (err)
2331 break;
2332 err = proc_put_long(&buffer, &left, lval, neg);
2333 if (err)
1da177e4 2334 break;
1da177e4
LT		 2335 }
2336 }
2337
00b7c339
AW		 2338 if (!write && !first && left && !err)
2339 err = proc_put_char(&buffer, &left, '\n');
563b0467 2340 if (write && !err && left)
00b7c339
AW		 2341 left -= proc_skip_spaces(&kbuf);
2342free:
1da177e4 2343 if (write) {
00b7c339
AW		 2344 free_page(page);
2345 if (first)
2346 return err ? : -EINVAL;
1da177e4 2347 }
1da177e4
LT		 2348 *lenp -= left;
2349 *ppos += *lenp;
00b7c339 2350 return err;
1da177e4
LT		 2351}
2352
8d65af78 2353static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547 2354 void __user *buffer, size_t *lenp, loff_t *ppos,
00b7c339 2355 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
fcfbd547
KK		 2356 int write, void *data),
2357 void *data)
2358{
8d65af78 2359 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2360 buffer, lenp, ppos, conv, data);
2361}
2362
1da177e4
LT		 2363/**
2364 * proc_dointvec - read a vector of integers
2365 * @table: the sysctl table
2366 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2367 * @buffer: the user buffer
2368 * @lenp: the size of the user buffer
2369 * @ppos: file position
2370 *
2371 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2372 * values from/to the user buffer, treated as an ASCII string.
2373 *
2374 * Returns 0 on success.
2375 */
8d65af78 2376int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2377 void __user *buffer, size_t *lenp, loff_t *ppos)
2378{
8d65af78 2379 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2380 NULL,NULL);
2381}
2382
34f5a398 2383/*
25ddbb18
AK		 2384 * Taint values can only be increased
2385 * This means we can safely use a temporary.
34f5a398 2386 */
8d65af78 2387static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2388 void __user *buffer, size_t *lenp, loff_t *ppos)
2389{
25ddbb18
AK		 2390 struct ctl_table t;
2391 unsigned long tmptaint = get_taint();
2392 int err;
34f5a398 2393
91fcd412 2394 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2395 return -EPERM;
2396
25ddbb18
AK		 2397 t = *table;
2398 t.data = &tmptaint;
8d65af78 2399 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2400 if (err < 0)
2401 return err;
2402
2403 if (write) {
2404 /*
2405 * Poor man's atomic or. Not worth adding a primitive
2406 * to everyone's atomic.h for this
2407 */
2408 int i;
2409 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2410 if ((tmptaint >> i) & 1)
2411 add_taint(i);
2412 }
2413 }
2414
2415 return err;
34f5a398
TT		 2416}
2417
bfdc0b49
RW		 2418#ifdef CONFIG_PRINTK
2419static int proc_dmesg_restrict(struct ctl_table *table, int write,
2420 void __user *buffer, size_t *lenp, loff_t *ppos)
2421{
2422 if (write && !capable(CAP_SYS_ADMIN))
2423 return -EPERM;
2424
2425 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2426}
2427#endif
2428
1da177e4
LT		 2429struct do_proc_dointvec_minmax_conv_param {
2430 int *min;
2431 int *max;
2432};
2433
00b7c339
AW		 2434static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2435 int *valp,
1da177e4
LT		 2436 int write, void *data)
2437{
2438 struct do_proc_dointvec_minmax_conv_param *param = data;
2439 if (write) {
2440 int val = *negp ? -*lvalp : *lvalp;
2441 if ((param->min && *param->min > val) ||
2442 (param->max && *param->max < val))
2443 return -EINVAL;
2444 *valp = val;
2445 } else {
2446 int val = *valp;
2447 if (val < 0) {
00b7c339 2448 *negp = true;
1da177e4
LT		 2449 *lvalp = (unsigned long)-val;
2450 } else {
00b7c339 2451 *negp = false;
1da177e4
LT		 2452 *lvalp = (unsigned long)val;
2453 }
2454 }
2455 return 0;
2456}
2457
2458/**
2459 * proc_dointvec_minmax - read a vector of integers with min/max values
2460 * @table: the sysctl table
2461 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2462 * @buffer: the user buffer
2463 * @lenp: the size of the user buffer
2464 * @ppos: file position
2465 *
2466 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2467 * values from/to the user buffer, treated as an ASCII string.
2468 *
2469 * This routine will ensure the values are within the range specified by
2470 * table->extra1 (min) and table->extra2 (max).
2471 *
2472 * Returns 0 on success.
2473 */
8d65af78 2474int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2475 void __user *buffer, size_t *lenp, loff_t *ppos)
2476{
2477 struct do_proc_dointvec_minmax_conv_param param = {
2478 .min = (int *) table->extra1,
2479 .max = (int *) table->extra2,
2480 };
8d65af78 2481 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2482 do_proc_dointvec_minmax_conv, &param);
2483}
2484
d8217f07 2485static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2486 void __user *buffer,
2487 size_t *lenp, loff_t *ppos,
2488 unsigned long convmul,
2489 unsigned long convdiv)
2490{
00b7c339
AW		 2491 unsigned long *i, *min, *max;
2492 int vleft, first = 1, err = 0;
2493 unsigned long page = 0;
2494 size_t left;
2495 char *kbuf;
2496
2497 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1da177e4
LT		 2498 *lenp = 0;
2499 return 0;
2500 }
00b7c339 2501
fcfbd547 2502 i = (unsigned long *) data;
1da177e4
LT		 2503 min = (unsigned long *) table->extra1;
2504 max = (unsigned long *) table->extra2;
2505 vleft = table->maxlen / sizeof(unsigned long);
2506 left = *lenp;
00b7c339
AW		 2507
2508 if (write) {
2509 if (left > PAGE_SIZE - 1)
2510 left = PAGE_SIZE - 1;
2511 page = __get_free_page(GFP_TEMPORARY);
2512 kbuf = (char *) page;
2513 if (!kbuf)
2514 return -ENOMEM;
2515 if (copy_from_user(kbuf, buffer, left)) {
2516 err = -EFAULT;
2517 goto free;
2518 }
2519 kbuf[left] = 0;
2520 }
2521
27b3d80a 2522 for (; left && vleft--; i++, first = 0) {
00b7c339
AW		 2523 unsigned long val;
2524
1da177e4 2525 if (write) {
00b7c339
AW		 2526 bool neg;
2527
2528 left -= proc_skip_spaces(&kbuf);
2529
2530 err = proc_get_long(&kbuf, &left, &val, &neg,
2531 proc_wspace_sep,
2532 sizeof(proc_wspace_sep), NULL);
2533 if (err)
1da177e4
LT		 2534 break;
2535 if (neg)
1da177e4
LT		 2536 continue;
2537 if ((min && val < *min) || (max && val > *max))
2538 continue;
2539 *i = val;
2540 } else {
00b7c339 2541 val = convdiv * (*i) / convmul;
1da177e4 2542 if (!first)
00b7c339
AW		 2543 err = proc_put_char(&buffer, &left, '\t');
2544 err = proc_put_long(&buffer, &left, val, false);
2545 if (err)
2546 break;
1da177e4
LT		 2547 }
2548 }
2549
00b7c339
AW		 2550 if (!write && !first && left && !err)
2551 err = proc_put_char(&buffer, &left, '\n');
2552 if (write && !err)
2553 left -= proc_skip_spaces(&kbuf);
2554free:
1da177e4 2555 if (write) {
00b7c339
AW		 2556 free_page(page);
2557 if (first)
2558 return err ? : -EINVAL;
1da177e4 2559 }
1da177e4
LT		 2560 *lenp -= left;
2561 *ppos += *lenp;
00b7c339 2562 return err;
1da177e4
LT		 2563}
2564
d8217f07 2565static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2566 void __user *buffer,
2567 size_t *lenp, loff_t *ppos,
2568 unsigned long convmul,
2569 unsigned long convdiv)
2570{
2571 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2572 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2573}
2574
1da177e4
LT		 2575/**
2576 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2577 * @table: the sysctl table
2578 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2579 * @buffer: the user buffer
2580 * @lenp: the size of the user buffer
2581 * @ppos: file position
2582 *
2583 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2584 * values from/to the user buffer, treated as an ASCII string.
2585 *
2586 * This routine will ensure the values are within the range specified by
2587 * table->extra1 (min) and table->extra2 (max).
2588 *
2589 * Returns 0 on success.
2590 */
8d65af78 2591int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2592 void __user *buffer, size_t *lenp, loff_t *ppos)
2593{
8d65af78 2594 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2595}
2596
2597/**
2598 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2599 * @table: the sysctl table
2600 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2601 * @buffer: the user buffer
2602 * @lenp: the size of the user buffer
2603 * @ppos: file position
2604 *
2605 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2606 * values from/to the user buffer, treated as an ASCII string. The values
2607 * are treated as milliseconds, and converted to jiffies when they are stored.
2608 *
2609 * This routine will ensure the values are within the range specified by
2610 * table->extra1 (min) and table->extra2 (max).
2611 *
2612 * Returns 0 on success.
2613 */
d8217f07 2614int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2615 void __user *buffer,
2616 size_t *lenp, loff_t *ppos)
2617{
8d65af78 2618 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2619 lenp, ppos, HZ, 1000l);
2620}
2621
2622
00b7c339 2623static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2624 int *valp,
2625 int write, void *data)
2626{
2627 if (write) {
cba9f33d
BS		 2628 if (*lvalp > LONG_MAX / HZ)
2629 return 1;
1da177e4
LT		 2630 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2631 } else {
2632 int val = *valp;
2633 unsigned long lval;
2634 if (val < 0) {
00b7c339 2635 *negp = true;
1da177e4
LT		 2636 lval = (unsigned long)-val;
2637 } else {
00b7c339 2638 *negp = false;
1da177e4
LT		 2639 lval = (unsigned long)val;
2640 }
2641 *lvalp = lval / HZ;
2642 }
2643 return 0;
2644}
2645
00b7c339 2646static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2647 int *valp,
2648 int write, void *data)
2649{
2650 if (write) {
cba9f33d
BS		 2651 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2652 return 1;
1da177e4
LT		 2653 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2654 } else {
2655 int val = *valp;
2656 unsigned long lval;
2657 if (val < 0) {
00b7c339 2658 *negp = true;
1da177e4
LT		 2659 lval = (unsigned long)-val;
2660 } else {
00b7c339 2661 *negp = false;
1da177e4
LT		 2662 lval = (unsigned long)val;
2663 }
2664 *lvalp = jiffies_to_clock_t(lval);
2665 }
2666 return 0;
2667}
2668
00b7c339 2669static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1da177e4
LT		 2670 int *valp,
2671 int write, void *data)
2672{
2673 if (write) {
2674 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2675 } else {
2676 int val = *valp;
2677 unsigned long lval;
2678 if (val < 0) {
00b7c339 2679 *negp = true;
1da177e4
LT		 2680 lval = (unsigned long)-val;
2681 } else {
00b7c339 2682 *negp = false;
1da177e4
LT		 2683 lval = (unsigned long)val;
2684 }
2685 *lvalp = jiffies_to_msecs(lval);
2686 }
2687 return 0;
2688}
2689
2690/**
2691 * proc_dointvec_jiffies - read a vector of integers as seconds
2692 * @table: the sysctl table
2693 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2694 * @buffer: the user buffer
2695 * @lenp: the size of the user buffer
2696 * @ppos: file position
2697 *
2698 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2699 * values from/to the user buffer, treated as an ASCII string.
2700 * The values read are assumed to be in seconds, and are converted into
2701 * jiffies.
2702 *
2703 * Returns 0 on success.
2704 */
8d65af78 2705int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2706 void __user *buffer, size_t *lenp, loff_t *ppos)
2707{
8d65af78 2708 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2709 do_proc_dointvec_jiffies_conv,NULL);
2710}
2711
2712/**
2713 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2714 * @table: the sysctl table
2715 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2716 * @buffer: the user buffer
2717 * @lenp: the size of the user buffer
1e5d5331 2718 * @ppos: pointer to the file position
1da177e4
LT		 2719 *
2720 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2721 * values from/to the user buffer, treated as an ASCII string.
2722 * The values read are assumed to be in 1/USER_HZ seconds, and
2723 * are converted into jiffies.
2724 *
2725 * Returns 0 on success.
2726 */
8d65af78 2727int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2728 void __user *buffer, size_t *lenp, loff_t *ppos)
2729{
8d65af78 2730 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2731 do_proc_dointvec_userhz_jiffies_conv,NULL);
2732}
2733
2734/**
2735 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2736 * @table: the sysctl table
2737 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2738 * @buffer: the user buffer
2739 * @lenp: the size of the user buffer
67be2dd1
MW		 2740 * @ppos: file position
2741 * @ppos: the current position in the file
1da177e4
LT		 2742 *
2743 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2744 * values from/to the user buffer, treated as an ASCII string.
2745 * The values read are assumed to be in 1/1000 seconds, and
2746 * are converted into jiffies.
2747 *
2748 * Returns 0 on success.
2749 */
8d65af78 2750int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2751 void __user *buffer, size_t *lenp, loff_t *ppos)
2752{
8d65af78 2753 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2754 do_proc_dointvec_ms_jiffies_conv, NULL);
2755}
2756
8d65af78 2757static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2758 void __user *buffer, size_t *lenp, loff_t *ppos)
2759{
2760 struct pid *new_pid;
2761 pid_t tmp;
2762 int r;
2763
6c5f3e7b 2764 tmp = pid_vnr(cad_pid);
9ec52099 2765
8d65af78 2766 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2767 lenp, ppos, NULL, NULL);
2768 if (r || !write)
2769 return r;
2770
2771 new_pid = find_get_pid(tmp);
2772 if (!new_pid)
2773 return -ESRCH;
2774
2775 put_pid(xchg(&cad_pid, new_pid));
2776 return 0;
2777}
2778
9f977fb7
OP		 2779/**
2780 * proc_do_large_bitmap - read/write from/to a large bitmap
2781 * @table: the sysctl table
2782 * @write: %TRUE if this is a write to the sysctl file
2783 * @buffer: the user buffer
2784 * @lenp: the size of the user buffer
2785 * @ppos: file position
2786 *
2787 * The bitmap is stored at table->data and the bitmap length (in bits)
2788 * in table->maxlen.
2789 *
2790 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2791 * large bitmaps may be represented in a compact manner. Writing into
2792 * the file will clear the bitmap then update it with the given input.
2793 *
2794 * Returns 0 on success.
2795 */
2796int proc_do_large_bitmap(struct ctl_table *table, int write,
2797 void __user *buffer, size_t *lenp, loff_t *ppos)
2798{
2799 int err = 0;
2800 bool first = 1;
2801 size_t left = *lenp;
2802 unsigned long bitmap_len = table->maxlen;
2803 unsigned long *bitmap = (unsigned long *) table->data;
2804 unsigned long *tmp_bitmap = NULL;
2805 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2806
2807 if (!bitmap_len || !left || (*ppos && !write)) {
2808 *lenp = 0;
2809 return 0;
2810 }
2811
2812 if (write) {
2813 unsigned long page = 0;
2814 char *kbuf;
2815
2816 if (left > PAGE_SIZE - 1)
2817 left = PAGE_SIZE - 1;
2818
2819 page = __get_free_page(GFP_TEMPORARY);
2820 kbuf = (char *) page;
2821 if (!kbuf)
2822 return -ENOMEM;
2823 if (copy_from_user(kbuf, buffer, left)) {
2824 free_page(page);
2825 return -EFAULT;
2826 }
2827 kbuf[left] = 0;
2828
2829 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2830 GFP_KERNEL);
2831 if (!tmp_bitmap) {
2832 free_page(page);
2833 return -ENOMEM;
2834 }
2835 proc_skip_char(&kbuf, &left, '\n');
2836 while (!err && left) {
2837 unsigned long val_a, val_b;
2838 bool neg;
2839
2840 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2841 sizeof(tr_a), &c);
2842 if (err)
2843 break;
2844 if (val_a >= bitmap_len || neg) {
2845 err = -EINVAL;
2846 break;
2847 }
2848
2849 val_b = val_a;
2850 if (left) {
2851 kbuf++;
2852 left--;
2853 }
2854
2855 if (c == '-') {
2856 err = proc_get_long(&kbuf, &left, &val_b,
2857 &neg, tr_b, sizeof(tr_b),
2858 &c);
2859 if (err)
2860 break;
2861 if (val_b >= bitmap_len || neg ||
2862 val_a > val_b) {
2863 err = -EINVAL;
2864 break;
2865 }
2866 if (left) {
2867 kbuf++;
2868 left--;
2869 }
2870 }
2871
2872 while (val_a <= val_b)
2873 set_bit(val_a++, tmp_bitmap);
2874
2875 first = 0;
2876 proc_skip_char(&kbuf, &left, '\n');
2877 }
2878 free_page(page);
2879 } else {
2880 unsigned long bit_a, bit_b = 0;
2881
2882 while (left) {
2883 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2884 if (bit_a >= bitmap_len)
2885 break;
2886 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2887 bit_a + 1) - 1;
2888
2889 if (!first) {
2890 err = proc_put_char(&buffer, &left, ',');
2891 if (err)
2892 break;
2893 }
2894 err = proc_put_long(&buffer, &left, bit_a, false);
2895 if (err)
2896 break;
2897 if (bit_a != bit_b) {
2898 err = proc_put_char(&buffer, &left, '-');
2899 if (err)
2900 break;
2901 err = proc_put_long(&buffer, &left, bit_b, false);
2902 if (err)
2903 break;
2904 }
2905
2906 first = 0; bit_b++;
2907 }
2908 if (!err)
2909 err = proc_put_char(&buffer, &left, '\n');
2910 }
2911
2912 if (!err) {
2913 if (write) {
2914 if (*ppos)
2915 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2916 else
2917 memcpy(bitmap, tmp_bitmap,
2918 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2919 }
2920 kfree(tmp_bitmap);
2921 *lenp -= left;
2922 *ppos += *lenp;
2923 return 0;
2924 } else {
2925 kfree(tmp_bitmap);
2926 return err;
2927 }
2928}
2929
55610500 2930#else /* CONFIG_PROC_SYSCTL */
1da177e4 2931
8d65af78 2932int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2933 void __user *buffer, size_t *lenp, loff_t *ppos)
2934{
2935 return -ENOSYS;
2936}
2937
8d65af78 2938int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2939 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2940{
2941 return -ENOSYS;
2942}
2943
8d65af78 2944int proc_dointvec_minmax(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_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_userhz_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_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2963 void __user *buffer, size_t *lenp, loff_t *ppos)
2964{
2965 return -ENOSYS;
2966}
2967
8d65af78 2968int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2969 void __user *buffer, size_t *lenp, loff_t *ppos)
2970{
2971 return -ENOSYS;
2972}
2973
d8217f07 2974int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2975 void __user *buffer,
2976 size_t *lenp, loff_t *ppos)
2977{
2978 return -ENOSYS;
2979}
2980
2981
55610500 2982#endif /* CONFIG_PROC_SYSCTL */
1da177e4 2983
1da177e4
LT		 2984/*
2985 * No sense putting this after each symbol definition, twice,
2986 * exception granted :-)
2987 */
2988EXPORT_SYMBOL(proc_dointvec);
2989EXPORT_SYMBOL(proc_dointvec_jiffies);
2990EXPORT_SYMBOL(proc_dointvec_minmax);
2991EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2992EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2993EXPORT_SYMBOL(proc_dostring);
2994EXPORT_SYMBOL(proc_doulongvec_minmax);
2995EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2996EXPORT_SYMBOL(register_sysctl_table);
29e796fd 2997EXPORT_SYMBOL(register_sysctl_paths);
1da177e4 2998EXPORT_SYMBOL(unregister_sysctl_table);
Linux kernel - Deliverables
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