projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
perf_counter: provide an mlock threshold
[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>
26#include <linux/proc_fs.h>
72c2d582 27#include <linux/security.h>
1da177e4
LT		 28#include <linux/ctype.h>
29#include <linux/utsname.h>
1da177e4 30#include <linux/smp_lock.h>
62239ac2 31#include <linux/fs.h>
1da177e4
LT		 32#include <linux/init.h>
33#include <linux/kernel.h>
0296b228 34#include <linux/kobject.h>
20380731 35#include <linux/net.h>
1da177e4
LT		 36#include <linux/sysrq.h>
37#include <linux/highuid.h>
38#include <linux/writeback.h>
39#include <linux/hugetlb.h>
1da177e4 40#include <linux/initrd.h>
0b77f5bf 41#include <linux/key.h>
1da177e4
LT		 42#include <linux/times.h>
43#include <linux/limits.h>
44#include <linux/dcache.h>
45#include <linux/syscalls.h>
c748e134 46#include <linux/vmstat.h>
c255d844
PM		 47#include <linux/nfs_fs.h>
48#include <linux/acpi.h>
10a0a8d4 49#include <linux/reboot.h>
b0fc494f 50#include <linux/ftrace.h>
12e22c5e 51#include <linux/slow-work.h>
1ccd1549 52#include <linux/perf_counter.h>
1da177e4
LT		 53
54#include <asm/uaccess.h>
55#include <asm/processor.h>
56
29cbc78b
AK		 57#ifdef CONFIG_X86
58#include <asm/nmi.h>
0741f4d2 59#include <asm/stacktrace.h>
6e7c4025 60#include <asm/io.h>
29cbc78b
AK		 61#endif
62
7058cb02
EB		 63static int deprecated_sysctl_warning(struct __sysctl_args *args);
64
1da177e4
LT		 65#if defined(CONFIG_SYSCTL)
66
67/* External variables not in a header file. */
68extern int C_A_D;
45807a1d 69extern int print_fatal_signals;
1da177e4
LT		 70extern int sysctl_overcommit_memory;
71extern int sysctl_overcommit_ratio;
fadd8fbd 72extern int sysctl_panic_on_oom;
fe071d7e 73extern int sysctl_oom_kill_allocating_task;
fef1bdd6 74extern int sysctl_oom_dump_tasks;
1da177e4 75extern int max_threads;
1da177e4 76extern int core_uses_pid;
d6e71144 77extern int suid_dumpable;
1da177e4 78extern char core_pattern[];
1da177e4
LT		 79extern int pid_max;
80extern int min_free_kbytes;
1da177e4 81extern int pid_max_min, pid_max_max;
9d0243bc 82extern int sysctl_drop_caches;
8ad4b1fb 83extern int percpu_pagelist_fraction;
bebfa101 84extern int compat_log;
9745512c 85extern int latencytop_enabled;
eceea0b3 86extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 87#ifndef CONFIG_MMU
88extern int sysctl_nr_trim_pages;
89#endif
31a72bce
PM		 90#ifdef CONFIG_RCU_TORTURE_TEST
91extern int rcutorture_runnable;
92#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 93
c4f3b63f 94/* Constants used for minimum and maximum */
195cf453 95#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 96static int sixty = 60;
9383d967 97static int neg_one = -1;
c4f3b63f
RT		 98#endif
99
c4f3b63f 100static int zero;
cd5f9a4c
LT		 101static int __maybe_unused one = 1;
102static int __maybe_unused two = 2;
fc3501d4 103static unsigned long one_ul = 1;
c4f3b63f 104static int one_hundred = 100;
fafd688e 105static int one_thousand = 1000;
c4f3b63f 106
1da177e4
LT		 107/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
108static int maxolduid = 65535;
109static int minolduid;
8ad4b1fb 110static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 111
112static int ngroups_max = NGROUPS_MAX;
113
a1ef5adb 114#ifdef CONFIG_MODULES
1da177e4
LT		 115extern char modprobe_path[];
116#endif
1da177e4
LT		 117#ifdef CONFIG_CHR_DEV_SG
118extern int sg_big_buff;
119#endif
1da177e4 120
72c57ed5 121#ifdef CONFIG_SPARC
17f04fbb 122#include <asm/system.h>
1da177e4
LT		 123#endif
124
0871420f
DM		 125#ifdef CONFIG_SPARC64
126extern int sysctl_tsb_ratio;
127#endif
128
1da177e4
LT		 129#ifdef __hppa__
130extern int pwrsw_enabled;
131extern int unaligned_enabled;
132#endif
133
347a8dc3 134#ifdef CONFIG_S390
1da177e4
LT		 135#ifdef CONFIG_MATHEMU
136extern int sysctl_ieee_emulation_warnings;
137#endif
138extern int sysctl_userprocess_debug;
951f22d5 139extern int spin_retry;
1da177e4
LT		 140#endif
141
1da177e4
LT		 142#ifdef CONFIG_BSD_PROCESS_ACCT
143extern int acct_parm[];
144#endif
145
d2b176ed
JS		 146#ifdef CONFIG_IA64
147extern int no_unaligned_warning;
88fc241f 148extern int unaligned_dump_stack;
d2b176ed
JS		 149#endif
150
23f78d4a
IM		 151#ifdef CONFIG_RT_MUTEXES
152extern int max_lock_depth;
153#endif
154
d6f8ff73 155#ifdef CONFIG_PROC_SYSCTL
d8217f07 156static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 157 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 158static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 159 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 160#endif
9ec52099 161
d8217f07 162static struct ctl_table root_table[];
e51b6ba0
EB		 163static struct ctl_table_root sysctl_table_root;
164static struct ctl_table_header root_table_header = {
b380b0d4 165 .count = 1,
e51b6ba0 166 .ctl_table = root_table,
73455092 167 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 168 .root = &sysctl_table_root,
73455092 169 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 170};
171static struct ctl_table_root sysctl_table_root = {
172 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 173 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 174};
1da177e4 175
d8217f07
EB		 176static struct ctl_table kern_table[];
177static struct ctl_table vm_table[];
178static struct ctl_table fs_table[];
179static struct ctl_table debug_table[];
180static struct ctl_table dev_table[];
181extern struct ctl_table random_table[];
2d9048e2 182#ifdef CONFIG_INOTIFY_USER
d8217f07 183extern struct ctl_table inotify_table[];
0399cb08 184#endif
7ef9964e
DL		 185#ifdef CONFIG_EPOLL
186extern struct ctl_table epoll_table[];
187#endif
1da177e4
LT		 188
189#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
190int sysctl_legacy_va_layout;
191#endif
192
f20786ff
PZ		 193extern int prove_locking;
194extern int lock_stat;
9bc9a6bd 195
1da177e4
LT		 196/* The default sysctl tables: */
197
d8217f07 198static struct ctl_table root_table[] = {
1da177e4
LT		 199 {
200 .ctl_name = CTL_KERN,
201 .procname = "kernel",
202 .mode = 0555,
203 .child = kern_table,
204 },
205 {
206 .ctl_name = CTL_VM,
207 .procname = "vm",
208 .mode = 0555,
209 .child = vm_table,
210 },
1da177e4
LT		 211 {
212 .ctl_name = CTL_FS,
213 .procname = "fs",
214 .mode = 0555,
215 .child = fs_table,
216 },
217 {
218 .ctl_name = CTL_DEBUG,
219 .procname = "debug",
220 .mode = 0555,
221 .child = debug_table,
222 },
223 {
224 .ctl_name = CTL_DEV,
225 .procname = "dev",
226 .mode = 0555,
227 .child = dev_table,
228 },
2be7fe07
AM		 229/*
230 * NOTE: do not add new entries to this table unless you have read
231 * Documentation/sysctl/ctl_unnumbered.txt
232 */
1da177e4
LT		 233 { .ctl_name = 0 }
234};
235
77e54a1f 236#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 237static int min_sched_granularity_ns = 100000; /* 100 usecs */
238static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
239static int min_wakeup_granularity_ns; /* 0 usecs */
240static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 241#endif
242
d8217f07 243static struct ctl_table kern_table[] = {
77e54a1f
IM		 244#ifdef CONFIG_SCHED_DEBUG
245 {
246 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 247 .procname = "sched_min_granularity_ns",
248 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 249 .maxlen = sizeof(unsigned int),
250 .mode = 0644,
b2be5e96
PZ		 251 .proc_handler = &sched_nr_latency_handler,
252 .strategy = &sysctl_intvec,
253 .extra1 = &min_sched_granularity_ns,
254 .extra2 = &max_sched_granularity_ns,
77e54a1f 255 },
21805085
PZ		 256 {
257 .ctl_name = CTL_UNNUMBERED,
258 .procname = "sched_latency_ns",
259 .data = &sysctl_sched_latency,
260 .maxlen = sizeof(unsigned int),
261 .mode = 0644,
b2be5e96 262 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 263 .strategy = &sysctl_intvec,
264 .extra1 = &min_sched_granularity_ns,
265 .extra2 = &max_sched_granularity_ns,
266 },
77e54a1f
IM		 267 {
268 .ctl_name = CTL_UNNUMBERED,
269 .procname = "sched_wakeup_granularity_ns",
270 .data = &sysctl_sched_wakeup_granularity,
271 .maxlen = sizeof(unsigned int),
272 .mode = 0644,
273 .proc_handler = &proc_dointvec_minmax,
274 .strategy = &sysctl_intvec,
77e54a1f
IM		 275 .extra1 = &min_wakeup_granularity_ns,
276 .extra2 = &max_wakeup_granularity_ns,
277 },
2398f2c6
PZ		 278 {
279 .ctl_name = CTL_UNNUMBERED,
280 .procname = "sched_shares_ratelimit",
281 .data = &sysctl_sched_shares_ratelimit,
282 .maxlen = sizeof(unsigned int),
283 .mode = 0644,
284 .proc_handler = &proc_dointvec,
285 },
ffda12a1
PZ		 286 {
287 .ctl_name = CTL_UNNUMBERED,
288 .procname = "sched_shares_thresh",
289 .data = &sysctl_sched_shares_thresh,
290 .maxlen = sizeof(unsigned int),
291 .mode = 0644,
292 .proc_handler = &proc_dointvec_minmax,
293 .strategy = &sysctl_intvec,
294 .extra1 = &zero,
295 },
77e54a1f
IM		 296 {
297 .ctl_name = CTL_UNNUMBERED,
298 .procname = "sched_child_runs_first",
299 .data = &sysctl_sched_child_runs_first,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
302 .proc_handler = &proc_dointvec,
303 },
1fc84aaa
PZ		 304 {
305 .ctl_name = CTL_UNNUMBERED,
306 .procname = "sched_features",
307 .data = &sysctl_sched_features,
308 .maxlen = sizeof(unsigned int),
309 .mode = 0644,
310 .proc_handler = &proc_dointvec,
311 },
da84d961
IM		 312 {
313 .ctl_name = CTL_UNNUMBERED,
314 .procname = "sched_migration_cost",
315 .data = &sysctl_sched_migration_cost,
316 .maxlen = sizeof(unsigned int),
317 .mode = 0644,
318 .proc_handler = &proc_dointvec,
319 },
b82d9fdd
PZ		 320 {
321 .ctl_name = CTL_UNNUMBERED,
322 .procname = "sched_nr_migrate",
323 .data = &sysctl_sched_nr_migrate,
324 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 325 .mode = 0644,
326 .proc_handler = &proc_dointvec,
327 },
1fc84aaa 328#endif
9f0c1e56
PZ		 329 {
330 .ctl_name = CTL_UNNUMBERED,
331 .procname = "sched_rt_period_us",
332 .data = &sysctl_sched_rt_period,
333 .maxlen = sizeof(unsigned int),
334 .mode = 0644,
d0b27fa7 335 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 336 },
337 {
338 .ctl_name = CTL_UNNUMBERED,
339 .procname = "sched_rt_runtime_us",
340 .data = &sysctl_sched_rt_runtime,
341 .maxlen = sizeof(int),
342 .mode = 0644,
d0b27fa7 343 .proc_handler = &sched_rt_handler,
9f0c1e56 344 },
1799e35d
IM		 345 {
346 .ctl_name = CTL_UNNUMBERED,
347 .procname = "sched_compat_yield",
348 .data = &sysctl_sched_compat_yield,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
351 .proc_handler = &proc_dointvec,
352 },
f20786ff
PZ		 353#ifdef CONFIG_PROVE_LOCKING
354 {
355 .ctl_name = CTL_UNNUMBERED,
356 .procname = "prove_locking",
357 .data = &prove_locking,
358 .maxlen = sizeof(int),
359 .mode = 0644,
360 .proc_handler = &proc_dointvec,
361 },
362#endif
363#ifdef CONFIG_LOCK_STAT
364 {
365 .ctl_name = CTL_UNNUMBERED,
366 .procname = "lock_stat",
367 .data = &lock_stat,
368 .maxlen = sizeof(int),
369 .mode = 0644,
370 .proc_handler = &proc_dointvec,
371 },
77e54a1f 372#endif
1da177e4
LT		 373 {
374 .ctl_name = KERN_PANIC,
375 .procname = "panic",
376 .data = &panic_timeout,
377 .maxlen = sizeof(int),
378 .mode = 0644,
379 .proc_handler = &proc_dointvec,
380 },
381 {
382 .ctl_name = KERN_CORE_USES_PID,
383 .procname = "core_uses_pid",
384 .data = &core_uses_pid,
385 .maxlen = sizeof(int),
386 .mode = 0644,
387 .proc_handler = &proc_dointvec,
388 },
389 {
390 .ctl_name = KERN_CORE_PATTERN,
391 .procname = "core_pattern",
392 .data = core_pattern,
71ce92f3 393 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 394 .mode = 0644,
395 .proc_handler = &proc_dostring,
396 .strategy = &sysctl_string,
397 },
34f5a398 398#ifdef CONFIG_PROC_SYSCTL
1da177e4 399 {
1da177e4 400 .procname = "tainted",
25ddbb18 401 .maxlen = sizeof(long),
34f5a398 402 .mode = 0644,
25ddbb18 403 .proc_handler = &proc_taint,
1da177e4 404 },
34f5a398 405#endif
9745512c
AV		 406#ifdef CONFIG_LATENCYTOP
407 {
408 .procname = "latencytop",
409 .data = &latencytop_enabled,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = &proc_dointvec,
413 },
414#endif
1da177e4
LT		 415#ifdef CONFIG_BLK_DEV_INITRD
416 {
417 .ctl_name = KERN_REALROOTDEV,
418 .procname = "real-root-dev",
419 .data = &real_root_dev,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = &proc_dointvec,
423 },
424#endif
45807a1d
IM		 425 {
426 .ctl_name = CTL_UNNUMBERED,
427 .procname = "print-fatal-signals",
428 .data = &print_fatal_signals,
429 .maxlen = sizeof(int),
430 .mode = 0644,
431 .proc_handler = &proc_dointvec,
432 },
72c57ed5 433#ifdef CONFIG_SPARC
1da177e4
LT		 434 {
435 .ctl_name = KERN_SPARC_REBOOT,
436 .procname = "reboot-cmd",
437 .data = reboot_command,
438 .maxlen = 256,
439 .mode = 0644,
440 .proc_handler = &proc_dostring,
441 .strategy = &sysctl_string,
442 },
443 {
444 .ctl_name = KERN_SPARC_STOP_A,
445 .procname = "stop-a",
446 .data = &stop_a_enabled,
447 .maxlen = sizeof (int),
448 .mode = 0644,
449 .proc_handler = &proc_dointvec,
450 },
451 {
452 .ctl_name = KERN_SPARC_SCONS_PWROFF,
453 .procname = "scons-poweroff",
454 .data = &scons_pwroff,
455 .maxlen = sizeof (int),
456 .mode = 0644,
457 .proc_handler = &proc_dointvec,
458 },
459#endif
0871420f
DM		 460#ifdef CONFIG_SPARC64
461 {
462 .ctl_name = CTL_UNNUMBERED,
463 .procname = "tsb-ratio",
464 .data = &sysctl_tsb_ratio,
465 .maxlen = sizeof (int),
466 .mode = 0644,
467 .proc_handler = &proc_dointvec,
468 },
469#endif
1da177e4
LT		 470#ifdef __hppa__
471 {
472 .ctl_name = KERN_HPPA_PWRSW,
473 .procname = "soft-power",
474 .data = &pwrsw_enabled,
475 .maxlen = sizeof (int),
476 .mode = 0644,
477 .proc_handler = &proc_dointvec,
478 },
479 {
480 .ctl_name = KERN_HPPA_UNALIGNED,
481 .procname = "unaligned-trap",
482 .data = &unaligned_enabled,
483 .maxlen = sizeof (int),
484 .mode = 0644,
485 .proc_handler = &proc_dointvec,
486 },
487#endif
488 {
489 .ctl_name = KERN_CTLALTDEL,
490 .procname = "ctrl-alt-del",
491 .data = &C_A_D,
492 .maxlen = sizeof(int),
493 .mode = 0644,
494 .proc_handler = &proc_dointvec,
495 },
606576ce 496#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 497 {
498 .ctl_name = CTL_UNNUMBERED,
499 .procname = "ftrace_enabled",
500 .data = &ftrace_enabled,
501 .maxlen = sizeof(int),
502 .mode = 0644,
503 .proc_handler = &ftrace_enable_sysctl,
504 },
505#endif
f38f1d2a
SR		 506#ifdef CONFIG_STACK_TRACER
507 {
508 .ctl_name = CTL_UNNUMBERED,
509 .procname = "stack_tracer_enabled",
510 .data = &stack_tracer_enabled,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = &stack_trace_sysctl,
514 },
515#endif
944ac425
SR		 516#ifdef CONFIG_TRACING
517 {
518 .ctl_name = CTL_UNNUMBERED,
3299b4dd 519 .procname = "ftrace_dump_on_oops",
944ac425
SR		 520 .data = &ftrace_dump_on_oops,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = &proc_dointvec,
524 },
525#endif
a1ef5adb 526#ifdef CONFIG_MODULES
1da177e4
LT		 527 {
528 .ctl_name = KERN_MODPROBE,
529 .procname = "modprobe",
530 .data = &modprobe_path,
531 .maxlen = KMOD_PATH_LEN,
532 .mode = 0644,
533 .proc_handler = &proc_dostring,
534 .strategy = &sysctl_string,
535 },
536#endif
57ae2508 537#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 538 {
539 .ctl_name = KERN_HOTPLUG,
540 .procname = "hotplug",
312c004d
KS		 541 .data = &uevent_helper,
542 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 543 .mode = 0644,
544 .proc_handler = &proc_dostring,
545 .strategy = &sysctl_string,
546 },
547#endif
548#ifdef CONFIG_CHR_DEV_SG
549 {
550 .ctl_name = KERN_SG_BIG_BUFF,
551 .procname = "sg-big-buff",
552 .data = &sg_big_buff,
553 .maxlen = sizeof (int),
554 .mode = 0444,
555 .proc_handler = &proc_dointvec,
556 },
557#endif
558#ifdef CONFIG_BSD_PROCESS_ACCT
559 {
560 .ctl_name = KERN_ACCT,
561 .procname = "acct",
562 .data = &acct_parm,
563 .maxlen = 3*sizeof(int),
564 .mode = 0644,
565 .proc_handler = &proc_dointvec,
566 },
567#endif
1da177e4
LT		 568#ifdef CONFIG_MAGIC_SYSRQ
569 {
570 .ctl_name = KERN_SYSRQ,
571 .procname = "sysrq",
5d6f647f 572 .data = &__sysrq_enabled,
1da177e4
LT		 573 .maxlen = sizeof (int),
574 .mode = 0644,
575 .proc_handler = &proc_dointvec,
576 },
577#endif
d6f8ff73 578#ifdef CONFIG_PROC_SYSCTL
1da177e4 579 {
1da177e4 580 .procname = "cad_pid",
9ec52099 581 .data = NULL,
1da177e4
LT		 582 .maxlen = sizeof (int),
583 .mode = 0600,
9ec52099 584 .proc_handler = &proc_do_cad_pid,
1da177e4 585 },
d6f8ff73 586#endif
1da177e4
LT		 587 {
588 .ctl_name = KERN_MAX_THREADS,
589 .procname = "threads-max",
590 .data = &max_threads,
591 .maxlen = sizeof(int),
592 .mode = 0644,
593 .proc_handler = &proc_dointvec,
594 },
595 {
596 .ctl_name = KERN_RANDOM,
597 .procname = "random",
598 .mode = 0555,
599 .child = random_table,
600 },
1da177e4
LT		 601 {
602 .ctl_name = KERN_OVERFLOWUID,
603 .procname = "overflowuid",
604 .data = &overflowuid,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = &proc_dointvec_minmax,
608 .strategy = &sysctl_intvec,
609 .extra1 = &minolduid,
610 .extra2 = &maxolduid,
611 },
612 {
613 .ctl_name = KERN_OVERFLOWGID,
614 .procname = "overflowgid",
615 .data = &overflowgid,
616 .maxlen = sizeof(int),
617 .mode = 0644,
618 .proc_handler = &proc_dointvec_minmax,
619 .strategy = &sysctl_intvec,
620 .extra1 = &minolduid,
621 .extra2 = &maxolduid,
622 },
347a8dc3 623#ifdef CONFIG_S390
1da177e4
LT		 624#ifdef CONFIG_MATHEMU
625 {
626 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
627 .procname = "ieee_emulation_warnings",
628 .data = &sysctl_ieee_emulation_warnings,
629 .maxlen = sizeof(int),
630 .mode = 0644,
631 .proc_handler = &proc_dointvec,
632 },
1da177e4
LT		 633#endif
634 {
635 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
636 .procname = "userprocess_debug",
637 .data = &sysctl_userprocess_debug,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = &proc_dointvec,
641 },
642#endif
643 {
644 .ctl_name = KERN_PIDMAX,
645 .procname = "pid_max",
646 .data = &pid_max,
647 .maxlen = sizeof (int),
648 .mode = 0644,
649 .proc_handler = &proc_dointvec_minmax,
650 .strategy = sysctl_intvec,
651 .extra1 = &pid_max_min,
652 .extra2 = &pid_max_max,
653 },
654 {
655 .ctl_name = KERN_PANIC_ON_OOPS,
656 .procname = "panic_on_oops",
657 .data = &panic_on_oops,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = &proc_dointvec,
661 },
7ef3d2fd
JP		 662#if defined CONFIG_PRINTK
663 {
664 .ctl_name = KERN_PRINTK,
665 .procname = "printk",
666 .data = &console_loglevel,
667 .maxlen = 4*sizeof(int),
668 .mode = 0644,
669 .proc_handler = &proc_dointvec,
670 },
1da177e4
LT		 671 {
672 .ctl_name = KERN_PRINTK_RATELIMIT,
673 .procname = "printk_ratelimit",
717115e1 674 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 675 .maxlen = sizeof(int),
676 .mode = 0644,
677 .proc_handler = &proc_dointvec_jiffies,
678 .strategy = &sysctl_jiffies,
679 },
680 {
681 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
682 .procname = "printk_ratelimit_burst",
717115e1 683 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 684 .maxlen = sizeof(int),
685 .mode = 0644,
686 .proc_handler = &proc_dointvec,
687 },
7ef3d2fd 688#endif
1da177e4
LT		 689 {
690 .ctl_name = KERN_NGROUPS_MAX,
691 .procname = "ngroups_max",
692 .data = &ngroups_max,
693 .maxlen = sizeof (int),
694 .mode = 0444,
695 .proc_handler = &proc_dointvec,
696 },
697#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
698 {
699 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
700 .procname = "unknown_nmi_panic",
701 .data = &unknown_nmi_panic,
702 .maxlen = sizeof (int),
703 .mode = 0644,
2fbe7b25 704 .proc_handler = &proc_dointvec,
1da177e4 705 },
407984f1 706 {
407984f1
DZ		 707 .procname = "nmi_watchdog",
708 .data = &nmi_watchdog_enabled,
709 .maxlen = sizeof (int),
710 .mode = 0644,
711 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 712 },
713#endif
714#if defined(CONFIG_X86)
8da5adda
DZ		 715 {
716 .ctl_name = KERN_PANIC_ON_NMI,
717 .procname = "panic_on_unrecovered_nmi",
718 .data = &panic_on_unrecovered_nmi,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = &proc_dointvec,
722 },
1da177e4
LT		 723 {
724 .ctl_name = KERN_BOOTLOADER_TYPE,
725 .procname = "bootloader_type",
726 .data = &bootloader_type,
727 .maxlen = sizeof (int),
728 .mode = 0444,
729 .proc_handler = &proc_dointvec,
730 },
0741f4d2
CE		 731 {
732 .ctl_name = CTL_UNNUMBERED,
733 .procname = "kstack_depth_to_print",
734 .data = &kstack_depth_to_print,
735 .maxlen = sizeof(int),
736 .mode = 0644,
737 .proc_handler = &proc_dointvec,
738 },
6e7c4025
IM		 739 {
740 .ctl_name = CTL_UNNUMBERED,
741 .procname = "io_delay_type",
742 .data = &io_delay_type,
743 .maxlen = sizeof(int),
744 .mode = 0644,
745 .proc_handler = &proc_dointvec,
746 },
1da177e4 747#endif
7a9166e3 748#if defined(CONFIG_MMU)
1da177e4
LT		 749 {
750 .ctl_name = KERN_RANDOMIZE,
751 .procname = "randomize_va_space",
752 .data = &randomize_va_space,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = &proc_dointvec,
756 },
7a9166e3 757#endif
0152fb37 758#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 759 {
760 .ctl_name = KERN_SPIN_RETRY,
761 .procname = "spin_retry",
762 .data = &spin_retry,
763 .maxlen = sizeof (int),
764 .mode = 0644,
765 .proc_handler = &proc_dointvec,
766 },
c255d844 767#endif
673d5b43 768#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 769 {
c255d844 770 .procname = "acpi_video_flags",
77afcf78 771 .data = &acpi_realmode_flags,
c255d844
PM		 772 .maxlen = sizeof (unsigned long),
773 .mode = 0644,
7f99f06f 774 .proc_handler = &proc_doulongvec_minmax,
c255d844 775 },
d2b176ed
JS		 776#endif
777#ifdef CONFIG_IA64
778 {
779 .ctl_name = KERN_IA64_UNALIGNED,
780 .procname = "ignore-unaligned-usertrap",
781 .data = &no_unaligned_warning,
782 .maxlen = sizeof (int),
783 .mode = 0644,
784 .proc_handler = &proc_dointvec,
785 },
88fc241f
DC		 786 {
787 .ctl_name = CTL_UNNUMBERED,
788 .procname = "unaligned-dump-stack",
789 .data = &unaligned_dump_stack,
790 .maxlen = sizeof (int),
791 .mode = 0644,
792 .proc_handler = &proc_dointvec,
793 },
bebfa101 794#endif
c4f3b63f 795#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 796 {
797 .ctl_name = CTL_UNNUMBERED,
798 .procname = "softlockup_panic",
799 .data = &softlockup_panic,
800 .maxlen = sizeof(int),
801 .mode = 0644,
4dca10a9 802 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 803 .strategy = &sysctl_intvec,
804 .extra1 = &zero,
805 .extra2 = &one,
806 },
c4f3b63f
RT		 807 {
808 .ctl_name = CTL_UNNUMBERED,
809 .procname = "softlockup_thresh",
810 .data = &softlockup_thresh,
9383d967 811 .maxlen = sizeof(int),
c4f3b63f 812 .mode = 0644,
baf48f65 813 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 814 .strategy = &sysctl_intvec,
9383d967 815 .extra1 = &neg_one,
c4f3b63f
RT		 816 .extra2 = &sixty,
817 },
e162b39a
MSB		 818#endif
819#ifdef CONFIG_DETECT_HUNG_TASK
820 {
821 .ctl_name = CTL_UNNUMBERED,
822 .procname = "hung_task_panic",
823 .data = &sysctl_hung_task_panic,
824 .maxlen = sizeof(int),
825 .mode = 0644,
826 .proc_handler = &proc_dointvec_minmax,
827 .strategy = &sysctl_intvec,
828 .extra1 = &zero,
829 .extra2 = &one,
830 },
82a1fcb9
IM		 831 {
832 .ctl_name = CTL_UNNUMBERED,
833 .procname = "hung_task_check_count",
834 .data = &sysctl_hung_task_check_count,
90739081 835 .maxlen = sizeof(unsigned long),
82a1fcb9 836 .mode = 0644,
90739081 837 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 838 .strategy = &sysctl_intvec,
839 },
840 {
841 .ctl_name = CTL_UNNUMBERED,
842 .procname = "hung_task_timeout_secs",
843 .data = &sysctl_hung_task_timeout_secs,
90739081 844 .maxlen = sizeof(unsigned long),
82a1fcb9 845 .mode = 0644,
e162b39a 846 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 847 .strategy = &sysctl_intvec,
848 },
849 {
850 .ctl_name = CTL_UNNUMBERED,
851 .procname = "hung_task_warnings",
852 .data = &sysctl_hung_task_warnings,
90739081 853 .maxlen = sizeof(unsigned long),
82a1fcb9 854 .mode = 0644,
90739081 855 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 856 .strategy = &sysctl_intvec,
857 },
c4f3b63f 858#endif
bebfa101
AK		 859#ifdef CONFIG_COMPAT
860 {
861 .ctl_name = KERN_COMPAT_LOG,
862 .procname = "compat-log",
863 .data = &compat_log,
864 .maxlen = sizeof (int),
865 .mode = 0644,
866 .proc_handler = &proc_dointvec,
867 },
951f22d5 868#endif
23f78d4a
IM		 869#ifdef CONFIG_RT_MUTEXES
870 {
871 .ctl_name = KERN_MAX_LOCK_DEPTH,
872 .procname = "max_lock_depth",
873 .data = &max_lock_depth,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = &proc_dointvec,
877 },
5096add8 878#endif
10a0a8d4
JF		 879 {
880 .ctl_name = CTL_UNNUMBERED,
881 .procname = "poweroff_cmd",
882 .data = &poweroff_cmd,
883 .maxlen = POWEROFF_CMD_PATH_LEN,
884 .mode = 0644,
885 .proc_handler = &proc_dostring,
886 .strategy = &sysctl_string,
887 },
0b77f5bf
DH		 888#ifdef CONFIG_KEYS
889 {
890 .ctl_name = CTL_UNNUMBERED,
891 .procname = "keys",
892 .mode = 0555,
893 .child = key_sysctls,
894 },
895#endif
31a72bce
PM		 896#ifdef CONFIG_RCU_TORTURE_TEST
897 {
898 .ctl_name = CTL_UNNUMBERED,
899 .procname = "rcutorture_runnable",
900 .data = &rcutorture_runnable,
901 .maxlen = sizeof(int),
902 .mode = 0644,
903 .proc_handler = &proc_dointvec,
904 },
905#endif
12e22c5e
DH		 906#ifdef CONFIG_SLOW_WORK
907 {
908 .ctl_name = CTL_UNNUMBERED,
909 .procname = "slow-work",
910 .mode = 0555,
911 .child = slow_work_sysctls,
912 },
913#endif
1ccd1549
PZ		 914#ifdef CONFIG_PERF_COUNTERS
915 {
916 .ctl_name = CTL_UNNUMBERED,
917 .procname = "perf_counter_privileged",
918 .data = &sysctl_perf_counter_priv,
919 .maxlen = sizeof(sysctl_perf_counter_priv),
920 .mode = 0644,
921 .proc_handler = &proc_dointvec,
922 },
c5078f78
PZ		 923 {
924 .ctl_name = CTL_UNNUMBERED,
925 .procname = "perf_counter_mlock_kb",
926 .data = &sysctl_perf_counter_mlock,
927 .maxlen = sizeof(sysctl_perf_counter_mlock),
928 .mode = 0644,
929 .proc_handler = &proc_dointvec,
930 },
1ccd1549 931#endif
ed2c12f3
AM		 932/*
933 * NOTE: do not add new entries to this table unless you have read
934 * Documentation/sysctl/ctl_unnumbered.txt
935 */
1da177e4
LT		 936 { .ctl_name = 0 }
937};
938
d8217f07 939static struct ctl_table vm_table[] = {
1da177e4
LT		 940 {
941 .ctl_name = VM_OVERCOMMIT_MEMORY,
942 .procname = "overcommit_memory",
943 .data = &sysctl_overcommit_memory,
944 .maxlen = sizeof(sysctl_overcommit_memory),
945 .mode = 0644,
946 .proc_handler = &proc_dointvec,
947 },
fadd8fbd
KH		 948 {
949 .ctl_name = VM_PANIC_ON_OOM,
950 .procname = "panic_on_oom",
951 .data = &sysctl_panic_on_oom,
952 .maxlen = sizeof(sysctl_panic_on_oom),
953 .mode = 0644,
954 .proc_handler = &proc_dointvec,
955 },
fe071d7e
DR		 956 {
957 .ctl_name = CTL_UNNUMBERED,
958 .procname = "oom_kill_allocating_task",
959 .data = &sysctl_oom_kill_allocating_task,
960 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
961 .mode = 0644,
962 .proc_handler = &proc_dointvec,
963 },
fef1bdd6
DR		 964 {
965 .ctl_name = CTL_UNNUMBERED,
966 .procname = "oom_dump_tasks",
967 .data = &sysctl_oom_dump_tasks,
968 .maxlen = sizeof(sysctl_oom_dump_tasks),
969 .mode = 0644,
970 .proc_handler = &proc_dointvec,
971 },
1da177e4
LT		 972 {
973 .ctl_name = VM_OVERCOMMIT_RATIO,
974 .procname = "overcommit_ratio",
975 .data = &sysctl_overcommit_ratio,
976 .maxlen = sizeof(sysctl_overcommit_ratio),
977 .mode = 0644,
978 .proc_handler = &proc_dointvec,
979 },
980 {
981 .ctl_name = VM_PAGE_CLUSTER,
982 .procname = "page-cluster",
983 .data = &page_cluster,
984 .maxlen = sizeof(int),
985 .mode = 0644,
986 .proc_handler = &proc_dointvec,
987 },
988 {
989 .ctl_name = VM_DIRTY_BACKGROUND,
990 .procname = "dirty_background_ratio",
991 .data = &dirty_background_ratio,
992 .maxlen = sizeof(dirty_background_ratio),
993 .mode = 0644,
2da02997 994 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 995 .strategy = &sysctl_intvec,
996 .extra1 = &zero,
997 .extra2 = &one_hundred,
998 },
2da02997
DR		 999 {
1000 .ctl_name = CTL_UNNUMBERED,
1001 .procname = "dirty_background_bytes",
1002 .data = &dirty_background_bytes,
1003 .maxlen = sizeof(dirty_background_bytes),
1004 .mode = 0644,
1005 .proc_handler = &dirty_background_bytes_handler,
1006 .strategy = &sysctl_intvec,
fc3501d4 1007 .extra1 = &one_ul,
2da02997 1008 },
1da177e4
LT		 1009 {
1010 .ctl_name = VM_DIRTY_RATIO,
1011 .procname = "dirty_ratio",
1012 .data = &vm_dirty_ratio,
1013 .maxlen = sizeof(vm_dirty_ratio),
1014 .mode = 0644,
04fbfdc1 1015 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1016 .strategy = &sysctl_intvec,
1017 .extra1 = &zero,
1018 .extra2 = &one_hundred,
1019 },
2da02997
DR		 1020 {
1021 .ctl_name = CTL_UNNUMBERED,
1022 .procname = "dirty_bytes",
1023 .data = &vm_dirty_bytes,
1024 .maxlen = sizeof(vm_dirty_bytes),
1025 .mode = 0644,
1026 .proc_handler = &dirty_bytes_handler,
1027 .strategy = &sysctl_intvec,
fc3501d4 1028 .extra1 = &one_ul,
2da02997 1029 },
1da177e4 1030 {
1da177e4 1031 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1032 .data = &dirty_writeback_interval,
1033 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1034 .mode = 0644,
1035 .proc_handler = &dirty_writeback_centisecs_handler,
1036 },
1037 {
1da177e4 1038 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1039 .data = &dirty_expire_interval,
1040 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1041 .mode = 0644,
704503d8 1042 .proc_handler = &proc_dointvec,
1da177e4
LT		 1043 },
1044 {
1045 .ctl_name = VM_NR_PDFLUSH_THREADS,
1046 .procname = "nr_pdflush_threads",
1047 .data = &nr_pdflush_threads,
1048 .maxlen = sizeof nr_pdflush_threads,
1049 .mode = 0444 /* read-only*/,
1050 .proc_handler = &proc_dointvec,
1051 },
fafd688e
PM		 1052 {
1053 .ctl_name = CTL_UNNUMBERED,
1054 .procname = "nr_pdflush_threads_min",
1055 .data = &nr_pdflush_threads_min,
1056 .maxlen = sizeof nr_pdflush_threads_min,
1057 .mode = 0644 /* read-write */,
1058 .proc_handler = &proc_dointvec_minmax,
1059 .strategy = &sysctl_intvec,
1060 .extra1 = &one,
1061 .extra2 = &nr_pdflush_threads_max,
1062 },
1063 {
1064 .ctl_name = CTL_UNNUMBERED,
1065 .procname = "nr_pdflush_threads_max",
1066 .data = &nr_pdflush_threads_max,
1067 .maxlen = sizeof nr_pdflush_threads_max,
1068 .mode = 0644 /* read-write */,
1069 .proc_handler = &proc_dointvec_minmax,
1070 .strategy = &sysctl_intvec,
1071 .extra1 = &nr_pdflush_threads_min,
1072 .extra2 = &one_thousand,
1073 },
1da177e4
LT		 1074 {
1075 .ctl_name = VM_SWAPPINESS,
1076 .procname = "swappiness",
1077 .data = &vm_swappiness,
1078 .maxlen = sizeof(vm_swappiness),
1079 .mode = 0644,
1080 .proc_handler = &proc_dointvec_minmax,
1081 .strategy = &sysctl_intvec,
1082 .extra1 = &zero,
1083 .extra2 = &one_hundred,
1084 },
1085#ifdef CONFIG_HUGETLB_PAGE
1086 {
1da177e4 1087 .procname = "nr_hugepages",
e5ff2159 1088 .data = NULL,
1da177e4
LT		 1089 .maxlen = sizeof(unsigned long),
1090 .mode = 0644,
1091 .proc_handler = &hugetlb_sysctl_handler,
1092 .extra1 = (void *)&hugetlb_zero,
1093 .extra2 = (void *)&hugetlb_infinity,
1094 },
1095 {
1096 .ctl_name = VM_HUGETLB_GROUP,
1097 .procname = "hugetlb_shm_group",
1098 .data = &sysctl_hugetlb_shm_group,
1099 .maxlen = sizeof(gid_t),
1100 .mode = 0644,
1101 .proc_handler = &proc_dointvec,
1102 },
396faf03
MG		 1103 {
1104 .ctl_name = CTL_UNNUMBERED,
1105 .procname = "hugepages_treat_as_movable",
1106 .data = &hugepages_treat_as_movable,
1107 .maxlen = sizeof(int),
1108 .mode = 0644,
1109 .proc_handler = &hugetlb_treat_movable_handler,
1110 },
d1c3fb1f
NA		 1111 {
1112 .ctl_name = CTL_UNNUMBERED,
1113 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1114 .data = NULL,
1115 .maxlen = sizeof(unsigned long),
d1c3fb1f 1116 .mode = 0644,
a3d0c6aa 1117 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1118 .extra1 = (void *)&hugetlb_zero,
1119 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1120 },
1da177e4
LT		 1121#endif
1122 {
1123 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1124 .procname = "lowmem_reserve_ratio",
1125 .data = &sysctl_lowmem_reserve_ratio,
1126 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1127 .mode = 0644,
1128 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1129 .strategy = &sysctl_intvec,
1130 },
9d0243bc
AM		 1131 {
1132 .ctl_name = VM_DROP_PAGECACHE,
1133 .procname = "drop_caches",
1134 .data = &sysctl_drop_caches,
1135 .maxlen = sizeof(int),
1136 .mode = 0644,
1137 .proc_handler = drop_caches_sysctl_handler,
1138 .strategy = &sysctl_intvec,
1139 },
1da177e4
LT		 1140 {
1141 .ctl_name = VM_MIN_FREE_KBYTES,
1142 .procname = "min_free_kbytes",
1143 .data = &min_free_kbytes,
1144 .maxlen = sizeof(min_free_kbytes),
1145 .mode = 0644,
1146 .proc_handler = &min_free_kbytes_sysctl_handler,
1147 .strategy = &sysctl_intvec,
1148 .extra1 = &zero,
1149 },
8ad4b1fb
RS		 1150 {
1151 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1152 .procname = "percpu_pagelist_fraction",
1153 .data = &percpu_pagelist_fraction,
1154 .maxlen = sizeof(percpu_pagelist_fraction),
1155 .mode = 0644,
1156 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1157 .strategy = &sysctl_intvec,
1158 .extra1 = &min_percpu_pagelist_fract,
1159 },
1da177e4
LT		 1160#ifdef CONFIG_MMU
1161 {
1162 .ctl_name = VM_MAX_MAP_COUNT,
1163 .procname = "max_map_count",
1164 .data = &sysctl_max_map_count,
1165 .maxlen = sizeof(sysctl_max_map_count),
1166 .mode = 0644,
1167 .proc_handler = &proc_dointvec
1168 },
dd8632a1
PM		 1169#else
1170 {
1171 .ctl_name = CTL_UNNUMBERED,
1172 .procname = "nr_trim_pages",
1173 .data = &sysctl_nr_trim_pages,
1174 .maxlen = sizeof(sysctl_nr_trim_pages),
1175 .mode = 0644,
1176 .proc_handler = &proc_dointvec_minmax,
1177 .strategy = &sysctl_intvec,
1178 .extra1 = &zero,
1179 },
1da177e4
LT		 1180#endif
1181 {
1182 .ctl_name = VM_LAPTOP_MODE,
1183 .procname = "laptop_mode",
1184 .data = &laptop_mode,
1185 .maxlen = sizeof(laptop_mode),
1186 .mode = 0644,
ed5b43f1
BS		 1187 .proc_handler = &proc_dointvec_jiffies,
1188 .strategy = &sysctl_jiffies,
1da177e4
LT		 1189 },
1190 {
1191 .ctl_name = VM_BLOCK_DUMP,
1192 .procname = "block_dump",
1193 .data = &block_dump,
1194 .maxlen = sizeof(block_dump),
1195 .mode = 0644,
1196 .proc_handler = &proc_dointvec,
1197 .strategy = &sysctl_intvec,
1198 .extra1 = &zero,
1199 },
1200 {
1201 .ctl_name = VM_VFS_CACHE_PRESSURE,
1202 .procname = "vfs_cache_pressure",
1203 .data = &sysctl_vfs_cache_pressure,
1204 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1205 .mode = 0644,
1206 .proc_handler = &proc_dointvec,
1207 .strategy = &sysctl_intvec,
1208 .extra1 = &zero,
1209 },
1210#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1211 {
1212 .ctl_name = VM_LEGACY_VA_LAYOUT,
1213 .procname = "legacy_va_layout",
1214 .data = &sysctl_legacy_va_layout,
1215 .maxlen = sizeof(sysctl_legacy_va_layout),
1216 .mode = 0644,
1217 .proc_handler = &proc_dointvec,
1218 .strategy = &sysctl_intvec,
1219 .extra1 = &zero,
1220 },
1221#endif
1743660b
CL		 1222#ifdef CONFIG_NUMA
1223 {
1224 .ctl_name = VM_ZONE_RECLAIM_MODE,
1225 .procname = "zone_reclaim_mode",
1226 .data = &zone_reclaim_mode,
1227 .maxlen = sizeof(zone_reclaim_mode),
1228 .mode = 0644,
1229 .proc_handler = &proc_dointvec,
c84db23c
CL		 1230 .strategy = &sysctl_intvec,
1231 .extra1 = &zero,
1743660b 1232 },
9614634f
CL		 1233 {
1234 .ctl_name = VM_MIN_UNMAPPED,
1235 .procname = "min_unmapped_ratio",
1236 .data = &sysctl_min_unmapped_ratio,
1237 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1238 .mode = 0644,
1239 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1240 .strategy = &sysctl_intvec,
1241 .extra1 = &zero,
1242 .extra2 = &one_hundred,
1243 },
0ff38490
CL		 1244 {
1245 .ctl_name = VM_MIN_SLAB,
1246 .procname = "min_slab_ratio",
1247 .data = &sysctl_min_slab_ratio,
1248 .maxlen = sizeof(sysctl_min_slab_ratio),
1249 .mode = 0644,
1250 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1251 .strategy = &sysctl_intvec,
1252 .extra1 = &zero,
1253 .extra2 = &one_hundred,
1254 },
e6e5494c 1255#endif
77461ab3
CL		 1256#ifdef CONFIG_SMP
1257 {
1258 .ctl_name = CTL_UNNUMBERED,
1259 .procname = "stat_interval",
1260 .data = &sysctl_stat_interval,
1261 .maxlen = sizeof(sysctl_stat_interval),
1262 .mode = 0644,
1263 .proc_handler = &proc_dointvec_jiffies,
1264 .strategy = &sysctl_jiffies,
1265 },
1266#endif
ed032189
EP		 1267#ifdef CONFIG_SECURITY
1268 {
1269 .ctl_name = CTL_UNNUMBERED,
1270 .procname = "mmap_min_addr",
1271 .data = &mmap_min_addr,
1272 .maxlen = sizeof(unsigned long),
1273 .mode = 0644,
1274 .proc_handler = &proc_doulongvec_minmax,
1275 },
8daec965 1276#endif
f0c0b2b8
KH		 1277#ifdef CONFIG_NUMA
1278 {
1279 .ctl_name = CTL_UNNUMBERED,
1280 .procname = "numa_zonelist_order",
1281 .data = &numa_zonelist_order,
1282 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1283 .mode = 0644,
1284 .proc_handler = &numa_zonelist_order_handler,
1285 .strategy = &sysctl_string,
1286 },
1287#endif
2b8232ce 1288#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1289 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1290 {
1291 .ctl_name = VM_VDSO_ENABLED,
1292 .procname = "vdso_enabled",
1293 .data = &vdso_enabled,
1294 .maxlen = sizeof(vdso_enabled),
1295 .mode = 0644,
1296 .proc_handler = &proc_dointvec,
1297 .strategy = &sysctl_intvec,
1298 .extra1 = &zero,
1299 },
1da177e4 1300#endif
195cf453
BG		 1301#ifdef CONFIG_HIGHMEM
1302 {
1303 .ctl_name = CTL_UNNUMBERED,
1304 .procname = "highmem_is_dirtyable",
1305 .data = &vm_highmem_is_dirtyable,
1306 .maxlen = sizeof(vm_highmem_is_dirtyable),
1307 .mode = 0644,
1308 .proc_handler = &proc_dointvec_minmax,
1309 .strategy = &sysctl_intvec,
1310 .extra1 = &zero,
1311 .extra2 = &one,
1312 },
1313#endif
4be6f6bb
PZ		 1314#ifdef CONFIG_UNEVICTABLE_LRU
1315 {
1316 .ctl_name = CTL_UNNUMBERED,
1317 .procname = "scan_unevictable_pages",
1318 .data = &scan_unevictable_pages,
1319 .maxlen = sizeof(scan_unevictable_pages),
1320 .mode = 0644,
1321 .proc_handler = &scan_unevictable_handler,
1322 },
1323#endif
2be7fe07
AM		 1324/*
1325 * NOTE: do not add new entries to this table unless you have read
1326 * Documentation/sysctl/ctl_unnumbered.txt
1327 */
1da177e4
LT		 1328 { .ctl_name = 0 }
1329};
1330
2abc26fc 1331#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1332static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1333 { .ctl_name = 0 }
1334};
1335#endif
1336
d8217f07 1337static struct ctl_table fs_table[] = {
1da177e4
LT		 1338 {
1339 .ctl_name = FS_NRINODE,
1340 .procname = "inode-nr",
1341 .data = &inodes_stat,
1342 .maxlen = 2*sizeof(int),
1343 .mode = 0444,
1344 .proc_handler = &proc_dointvec,
1345 },
1346 {
1347 .ctl_name = FS_STATINODE,
1348 .procname = "inode-state",
1349 .data = &inodes_stat,
1350 .maxlen = 7*sizeof(int),
1351 .mode = 0444,
1352 .proc_handler = &proc_dointvec,
1353 },
1354 {
1da177e4
LT		 1355 .procname = "file-nr",
1356 .data = &files_stat,
1357 .maxlen = 3*sizeof(int),
1358 .mode = 0444,
529bf6be 1359 .proc_handler = &proc_nr_files,
1da177e4
LT		 1360 },
1361 {
1362 .ctl_name = FS_MAXFILE,
1363 .procname = "file-max",
1364 .data = &files_stat.max_files,
1365 .maxlen = sizeof(int),
1366 .mode = 0644,
1367 .proc_handler = &proc_dointvec,
1368 },
9cfe015a
ED		 1369 {
1370 .ctl_name = CTL_UNNUMBERED,
1371 .procname = "nr_open",
1372 .data = &sysctl_nr_open,
1373 .maxlen = sizeof(int),
1374 .mode = 0644,
eceea0b3
AV		 1375 .proc_handler = &proc_dointvec_minmax,
1376 .extra1 = &sysctl_nr_open_min,
1377 .extra2 = &sysctl_nr_open_max,
9cfe015a 1378 },
1da177e4
LT		 1379 {
1380 .ctl_name = FS_DENTRY,
1381 .procname = "dentry-state",
1382 .data = &dentry_stat,
1383 .maxlen = 6*sizeof(int),
1384 .mode = 0444,
1385 .proc_handler = &proc_dointvec,
1386 },
1387 {
1388 .ctl_name = FS_OVERFLOWUID,
1389 .procname = "overflowuid",
1390 .data = &fs_overflowuid,
1391 .maxlen = sizeof(int),
1392 .mode = 0644,
1393 .proc_handler = &proc_dointvec_minmax,
1394 .strategy = &sysctl_intvec,
1395 .extra1 = &minolduid,
1396 .extra2 = &maxolduid,
1397 },
1398 {
1399 .ctl_name = FS_OVERFLOWGID,
1400 .procname = "overflowgid",
1401 .data = &fs_overflowgid,
1402 .maxlen = sizeof(int),
1403 .mode = 0644,
1404 .proc_handler = &proc_dointvec_minmax,
1405 .strategy = &sysctl_intvec,
1406 .extra1 = &minolduid,
1407 .extra2 = &maxolduid,
1408 },
bfcd17a6 1409#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1410 {
1411 .ctl_name = FS_LEASES,
1412 .procname = "leases-enable",
1413 .data = &leases_enable,
1414 .maxlen = sizeof(int),
1415 .mode = 0644,
1416 .proc_handler = &proc_dointvec,
1417 },
bfcd17a6 1418#endif
1da177e4
LT		 1419#ifdef CONFIG_DNOTIFY
1420 {
1421 .ctl_name = FS_DIR_NOTIFY,
1422 .procname = "dir-notify-enable",
1423 .data = &dir_notify_enable,
1424 .maxlen = sizeof(int),
1425 .mode = 0644,
1426 .proc_handler = &proc_dointvec,
1427 },
1428#endif
1429#ifdef CONFIG_MMU
bfcd17a6 1430#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1431 {
1432 .ctl_name = FS_LEASE_TIME,
1433 .procname = "lease-break-time",
1434 .data = &lease_break_time,
1435 .maxlen = sizeof(int),
1436 .mode = 0644,
8e654fba 1437 .proc_handler = &proc_dointvec,
1da177e4 1438 },
bfcd17a6 1439#endif
ebf3f09c 1440#ifdef CONFIG_AIO
1da177e4 1441 {
1da177e4
LT		 1442 .procname = "aio-nr",
1443 .data = &aio_nr,
1444 .maxlen = sizeof(aio_nr),
1445 .mode = 0444,
d55b5fda 1446 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1447 },
1448 {
1da177e4
LT		 1449 .procname = "aio-max-nr",
1450 .data = &aio_max_nr,
1451 .maxlen = sizeof(aio_max_nr),
1452 .mode = 0644,
d55b5fda 1453 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1454 },
ebf3f09c 1455#endif /* CONFIG_AIO */
2d9048e2 1456#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1457 {
1458 .ctl_name = FS_INOTIFY,
1459 .procname = "inotify",
1460 .mode = 0555,
1461 .child = inotify_table,
1462 },
1463#endif
7ef9964e
DL		 1464#ifdef CONFIG_EPOLL
1465 {
1466 .procname = "epoll",
1467 .mode = 0555,
1468 .child = epoll_table,
1469 },
1470#endif
1da177e4 1471#endif
d6e71144
AC		 1472 {
1473 .ctl_name = KERN_SETUID_DUMPABLE,
1474 .procname = "suid_dumpable",
1475 .data = &suid_dumpable,
1476 .maxlen = sizeof(int),
1477 .mode = 0644,
8e654fba
MW		 1478 .proc_handler = &proc_dointvec_minmax,
1479 .strategy = &sysctl_intvec,
1480 .extra1 = &zero,
1481 .extra2 = &two,
d6e71144 1482 },
2abc26fc
EB		 1483#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1484 {
1485 .ctl_name = CTL_UNNUMBERED,
1486 .procname = "binfmt_misc",
1487 .mode = 0555,
1488 .child = binfmt_misc_table,
1489 },
1490#endif
2be7fe07
AM		 1491/*
1492 * NOTE: do not add new entries to this table unless you have read
1493 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1494 */
1da177e4
LT		 1495 { .ctl_name = 0 }
1496};
1497
d8217f07 1498static struct ctl_table debug_table[] = {
d0c3d534 1499#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1500 {
1501 .ctl_name = CTL_UNNUMBERED,
1502 .procname = "exception-trace",
1503 .data = &show_unhandled_signals,
1504 .maxlen = sizeof(int),
1505 .mode = 0644,
1506 .proc_handler = proc_dointvec
1507 },
1508#endif
1da177e4
LT		 1509 { .ctl_name = 0 }
1510};
1511
d8217f07 1512static struct ctl_table dev_table[] = {
1da177e4 1513 { .ctl_name = 0 }
0eeca283 1514};
1da177e4 1515
330d57fb
AV		 1516static DEFINE_SPINLOCK(sysctl_lock);
1517
1518/* called under sysctl_lock */
1519static int use_table(struct ctl_table_header *p)
1520{
1521 if (unlikely(p->unregistering))
1522 return 0;
1523 p->used++;
1524 return 1;
1525}
1526
1527/* called under sysctl_lock */
1528static void unuse_table(struct ctl_table_header *p)
1529{
1530 if (!--p->used)
1531 if (unlikely(p->unregistering))
1532 complete(p->unregistering);
1533}
1534
1535/* called under sysctl_lock, will reacquire if has to wait */
1536static void start_unregistering(struct ctl_table_header *p)
1537{
1538 /*
1539 * if p->used is 0, nobody will ever touch that entry again;
1540 * we'll eliminate all paths to it before dropping sysctl_lock
1541 */
1542 if (unlikely(p->used)) {
1543 struct completion wait;
1544 init_completion(&wait);
1545 p->unregistering = &wait;
1546 spin_unlock(&sysctl_lock);
1547 wait_for_completion(&wait);
1548 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1549 } else {
1550 /* anything non-NULL; we'll never dereference it */
1551 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1552 }
1553 /*
1554 * do not remove from the list until nobody holds it; walking the
1555 * list in do_sysctl() relies on that.
1556 */
1557 list_del_init(&p->ctl_entry);
1558}
1559
f7e6ced4
AV		 1560void sysctl_head_get(struct ctl_table_header *head)
1561{
1562 spin_lock(&sysctl_lock);
1563 head->count++;
1564 spin_unlock(&sysctl_lock);
1565}
1566
1567void sysctl_head_put(struct ctl_table_header *head)
1568{
1569 spin_lock(&sysctl_lock);
1570 if (!--head->count)
1571 kfree(head);
1572 spin_unlock(&sysctl_lock);
1573}
1574
1575struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1576{
1577 if (!head)
1578 BUG();
1579 spin_lock(&sysctl_lock);
1580 if (!use_table(head))
1581 head = ERR_PTR(-ENOENT);
1582 spin_unlock(&sysctl_lock);
1583 return head;
1584}
1585
805b5d5e
EB		 1586void sysctl_head_finish(struct ctl_table_header *head)
1587{
1588 if (!head)
1589 return;
1590 spin_lock(&sysctl_lock);
1591 unuse_table(head);
1592 spin_unlock(&sysctl_lock);
1593}
1594
73455092
AV		 1595static struct ctl_table_set *
1596lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1597{
1598 struct ctl_table_set *set = &root->default_set;
1599 if (root->lookup)
1600 set = root->lookup(root, namespaces);
1601 return set;
1602}
1603
e51b6ba0
EB		 1604static struct list_head *
1605lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1606{
73455092
AV		 1607 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1608 return &set->list;
e51b6ba0
EB		 1609}
1610
1611struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1612 struct ctl_table_header *prev)
1613{
1614 struct ctl_table_root *root;
1615 struct list_head *header_list;
805b5d5e
EB		 1616 struct ctl_table_header *head;
1617 struct list_head *tmp;
e51b6ba0 1618
805b5d5e
EB		 1619 spin_lock(&sysctl_lock);
1620 if (prev) {
e51b6ba0 1621 head = prev;
805b5d5e
EB		 1622 tmp = &prev->ctl_entry;
1623 unuse_table(prev);
1624 goto next;
1625 }
1626 tmp = &root_table_header.ctl_entry;
1627 for (;;) {
1628 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1629
1630 if (!use_table(head))
1631 goto next;
1632 spin_unlock(&sysctl_lock);
1633 return head;
1634 next:
e51b6ba0 1635 root = head->root;
805b5d5e 1636 tmp = tmp->next;
e51b6ba0
EB		 1637 header_list = lookup_header_list(root, namespaces);
1638 if (tmp != header_list)
1639 continue;
1640
1641 do {
1642 root = list_entry(root->root_list.next,
1643 struct ctl_table_root, root_list);
1644 if (root == &sysctl_table_root)
1645 goto out;
1646 header_list = lookup_header_list(root, namespaces);
1647 } while (list_empty(header_list));
1648 tmp = header_list->next;
805b5d5e 1649 }
e51b6ba0 1650out:
805b5d5e
EB		 1651 spin_unlock(&sysctl_lock);
1652 return NULL;
1653}
1654
e51b6ba0
EB		 1655struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1656{
1657 return __sysctl_head_next(current->nsproxy, prev);
1658}
1659
1660void register_sysctl_root(struct ctl_table_root *root)
1661{
1662 spin_lock(&sysctl_lock);
1663 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1664 spin_unlock(&sysctl_lock);
1665}
1666
b89a8171 1667#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1668/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1669static int do_sysctl_strategy(struct ctl_table_root *root,
1670 struct ctl_table *table,
2c4c7155
PE		 1671 void __user *oldval, size_t __user *oldlenp,
1672 void __user *newval, size_t newlen)
1673{
1674 int op = 0, rc;
1675
1676 if (oldval)
e6305c43 1677 op |= MAY_READ;
2c4c7155 1678 if (newval)
e6305c43 1679 op |= MAY_WRITE;
d7321cd6 1680 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1681 return -EPERM;
1682
1683 if (table->strategy) {
f221e726 1684 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1685 if (rc < 0)
1686 return rc;
1687 if (rc > 0)
1688 return 0;
1689 }
1690
1691 /* If there is no strategy routine, or if the strategy returns
1692 * zero, proceed with automatic r/w */
1693 if (table->data && table->maxlen) {
f221e726 1694 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1695 if (rc < 0)
1696 return rc;
1697 }
1698 return 0;
1699}
1700
1701static int parse_table(int __user *name, int nlen,
1702 void __user *oldval, size_t __user *oldlenp,
1703 void __user *newval, size_t newlen,
d7321cd6 1704 struct ctl_table_root *root,
2c4c7155
PE		 1705 struct ctl_table *table)
1706{
1707 int n;
1708repeat:
1709 if (!nlen)
1710 return -ENOTDIR;
1711 if (get_user(n, name))
1712 return -EFAULT;
1713 for ( ; table->ctl_name || table->procname; table++) {
1714 if (!table->ctl_name)
1715 continue;
1716 if (n == table->ctl_name) {
1717 int error;
1718 if (table->child) {
e6305c43 1719 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1720 return -EPERM;
1721 name++;
1722 nlen--;
1723 table = table->child;
1724 goto repeat;
1725 }
f221e726 1726 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1727 oldval, oldlenp,
1728 newval, newlen);
1729 return error;
1730 }
1731 }
1732 return -ENOTDIR;
1733}
1734
1da177e4
LT		 1735int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1736 void __user *newval, size_t newlen)
1737{
805b5d5e 1738 struct ctl_table_header *head;
330d57fb 1739 int error = -ENOTDIR;
1da177e4
LT		 1740
1741 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1742 return -ENOTDIR;
1743 if (oldval) {
1744 int old_len;
1745 if (!oldlenp || get_user(old_len, oldlenp))
1746 return -EFAULT;
1747 }
330d57fb 1748
805b5d5e
EB		 1749 for (head = sysctl_head_next(NULL); head;
1750 head = sysctl_head_next(head)) {
330d57fb 1751 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1752 newval, newlen,
1753 head->root, head->ctl_table);
805b5d5e
EB		 1754 if (error != -ENOTDIR) {
1755 sysctl_head_finish(head);
330d57fb 1756 break;
805b5d5e
EB		 1757 }
1758 }
330d57fb 1759 return error;
1da177e4
LT		 1760}
1761
1e7bfb21 1762SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1763{
1764 struct __sysctl_args tmp;
1765 int error;
1766
1767 if (copy_from_user(&tmp, args, sizeof(tmp)))
1768 return -EFAULT;
1769
7058cb02
EB		 1770 error = deprecated_sysctl_warning(&tmp);
1771 if (error)
1772 goto out;
1773
1da177e4
LT		 1774 lock_kernel();
1775 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1776 tmp.newval, tmp.newlen);
1777 unlock_kernel();
7058cb02 1778out:
1da177e4
LT		 1779 return error;
1780}
b89a8171 1781#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1782
1783/*
1ff007eb 1784 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1785 * some sysctl variables are readonly even to root.
1786 */
1787
1788static int test_perm(int mode, int op)
1789{
76aac0e9 1790 if (!current_euid())
1da177e4
LT		 1791 mode >>= 6;
1792 else if (in_egroup_p(0))
1793 mode >>= 3;
e6305c43 1794 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1795 return 0;
1796 return -EACCES;
1797}
1798
d7321cd6 1799int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1800{
1801 int error;
d7321cd6
PE		 1802 int mode;
1803
e6305c43 1804 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1805 if (error)
1806 return error;
d7321cd6
PE		 1807
1808 if (root->permissions)
1809 mode = root->permissions(root, current->nsproxy, table);
1810 else
1811 mode = table->mode;
1812
1813 return test_perm(mode, op);
1da177e4
LT		 1814}
1815
d912b0cc
EB		 1816static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1817{
1818 for (; table->ctl_name || table->procname; table++) {
1819 table->parent = parent;
1820 if (table->child)
1821 sysctl_set_parent(table, table->child);
1822 }
1823}
1824
1825static __init int sysctl_init(void)
1826{
1827 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1828#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1829 {
1830 int err;
1831 err = sysctl_check_table(current->nsproxy, root_table);
1832 }
1833#endif
d912b0cc
EB		 1834 return 0;
1835}
1836
1837core_initcall(sysctl_init);
1838
bfbcf034
AV		 1839static struct ctl_table *is_branch_in(struct ctl_table *branch,
1840 struct ctl_table *table)
ae7edecc
AV		 1841{
1842 struct ctl_table *p;
1843 const char *s = branch->procname;
1844
1845 /* branch should have named subdirectory as its first element */
1846 if (!s || !branch->child)
bfbcf034 1847 return NULL;
ae7edecc
AV		 1848
1849 /* ... and nothing else */
1850 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1851 return NULL;
ae7edecc
AV		 1852
1853 /* table should contain subdirectory with the same name */
1854 for (p = table; p->procname || p->ctl_name; p++) {
1855 if (!p->child)
1856 continue;
1857 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1858 return p;
ae7edecc 1859 }
bfbcf034 1860 return NULL;
ae7edecc
AV		 1861}
1862
1863/* see if attaching q to p would be an improvement */
1864static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1865{
1866 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1867 struct ctl_table *next;
ae7edecc
AV		 1868 int is_better = 0;
1869 int not_in_parent = !p->attached_by;
1870
bfbcf034 1871 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1872 if (by == q->attached_by)
1873 is_better = 1;
1874 if (to == p->attached_by)
1875 not_in_parent = 1;
1876 by = by->child;
bfbcf034 1877 to = next->child;
ae7edecc
AV		 1878 }
1879
1880 if (is_better && not_in_parent) {
1881 q->attached_by = by;
1882 q->attached_to = to;
1883 q->parent = p;
1884 }
1885}
1886
1da177e4 1887/**
e51b6ba0
EB		 1888 * __register_sysctl_paths - register a sysctl hierarchy
1889 * @root: List of sysctl headers to register on
1890 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1891 * @path: The path to the directory the sysctl table is in.
1da177e4 1892 * @table: the top-level table structure
1da177e4
LT		 1893 *
1894 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1895 * array. A completely 0 filled entry terminates the table.
1da177e4 1896 *
d8217f07 1897 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1898 *
1899 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1900 * must be unique within that level of sysctl
1901 *
1902 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1903 * enter a sysctl file
1904 *
1905 * data - a pointer to data for use by proc_handler
1906 *
1907 * maxlen - the maximum size in bytes of the data
1908 *
1909 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1910 *
1911 * child - a pointer to the child sysctl table if this entry is a directory, or
1912 * %NULL.
1913 *
1914 * proc_handler - the text handler routine (described below)
1915 *
1916 * strategy - the strategy routine (described below)
1917 *
1918 * de - for internal use by the sysctl routines
1919 *
1920 * extra1, extra2 - extra pointers usable by the proc handler routines
1921 *
1922 * Leaf nodes in the sysctl tree will be represented by a single file
1923 * under /proc; non-leaf nodes will be represented by directories.
1924 *
1925 * sysctl(2) can automatically manage read and write requests through
1926 * the sysctl table. The data and maxlen fields of the ctl_table
1927 * struct enable minimal validation of the values being written to be
1928 * performed, and the mode field allows minimal authentication.
1929 *
1930 * More sophisticated management can be enabled by the provision of a
1931 * strategy routine with the table entry. This will be called before
1932 * any automatic read or write of the data is performed.
1933 *
1934 * The strategy routine may return
1935 *
1936 * < 0 - Error occurred (error is passed to user process)
1937 *
1938 * 0 - OK - proceed with automatic read or write.
1939 *
1940 * > 0 - OK - read or write has been done by the strategy routine, so
1941 * return immediately.
1942 *
1943 * There must be a proc_handler routine for any terminal nodes
1944 * mirrored under /proc/sys (non-terminals are handled by a built-in
1945 * directory handler). Several default handlers are available to
1946 * cover common cases -
1947 *
1948 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1949 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1950 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1951 *
1952 * It is the handler's job to read the input buffer from user memory
1953 * and process it. The handler should return 0 on success.
1954 *
1955 * This routine returns %NULL on a failure to register, and a pointer
1956 * to the table header on success.
1957 */
e51b6ba0
EB		 1958struct ctl_table_header *__register_sysctl_paths(
1959 struct ctl_table_root *root,
1960 struct nsproxy *namespaces,
1961 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1962{
29e796fd
EB		 1963 struct ctl_table_header *header;
1964 struct ctl_table *new, **prevp;
1965 unsigned int n, npath;
ae7edecc 1966 struct ctl_table_set *set;
29e796fd
EB		 1967
1968 /* Count the path components */
1969 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1970 ;
1971
1972 /*
1973 * For each path component, allocate a 2-element ctl_table array.
1974 * The first array element will be filled with the sysctl entry
1975 * for this, the second will be the sentinel (ctl_name == 0).
1976 *
1977 * We allocate everything in one go so that we don't have to
1978 * worry about freeing additional memory in unregister_sysctl_table.
1979 */
1980 header = kzalloc(sizeof(struct ctl_table_header) +
1981 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1982 if (!header)
1da177e4 1983 return NULL;
29e796fd
EB		 1984
1985 new = (struct ctl_table *) (header + 1);
1986
1987 /* Now connect the dots */
1988 prevp = &header->ctl_table;
1989 for (n = 0; n < npath; ++n, ++path) {
1990 /* Copy the procname */
1991 new->procname = path->procname;
1992 new->ctl_name = path->ctl_name;
1993 new->mode = 0555;
1994
1995 *prevp = new;
1996 prevp = &new->child;
1997
1998 new += 2;
1999 }
2000 *prevp = table;
23eb06de 2001 header->ctl_table_arg = table;
29e796fd
EB		 2002
2003 INIT_LIST_HEAD(&header->ctl_entry);
2004 header->used = 0;
2005 header->unregistering = NULL;
e51b6ba0 2006 header->root = root;
29e796fd 2007 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 2008 header->count = 1;
88f458e4 2009#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 2010 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 2011 kfree(header);
fc6cd25b
EB		 2012 return NULL;
2013 }
88f458e4 2014#endif
330d57fb 2015 spin_lock(&sysctl_lock);
73455092 2016 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 2017 header->attached_by = header->ctl_table;
2018 header->attached_to = root_table;
2019 header->parent = &root_table_header;
2020 for (set = header->set; set; set = set->parent) {
2021 struct ctl_table_header *p;
2022 list_for_each_entry(p, &set->list, ctl_entry) {
2023 if (p->unregistering)
2024 continue;
2025 try_attach(p, header);
2026 }
2027 }
2028 header->parent->count++;
73455092 2029 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 2030 spin_unlock(&sysctl_lock);
29e796fd
EB		 2031
2032 return header;
2033}
2034
e51b6ba0
EB		 2035/**
2036 * register_sysctl_table_path - register a sysctl table hierarchy
2037 * @path: The path to the directory the sysctl table is in.
2038 * @table: the top-level table structure
2039 *
2040 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2041 * array. A completely 0 filled entry terminates the table.
2042 *
2043 * See __register_sysctl_paths for more details.
2044 */
2045struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2046 struct ctl_table *table)
2047{
2048 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2049 path, table);
2050}
2051
29e796fd
EB		 2052/**
2053 * register_sysctl_table - register a sysctl table hierarchy
2054 * @table: the top-level table structure
2055 *
2056 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2057 * array. A completely 0 filled entry terminates the table.
2058 *
2059 * See register_sysctl_paths for more details.
2060 */
2061struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2062{
2063 static const struct ctl_path null_path[] = { {} };
2064
2065 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2066}
2067
2068/**
2069 * unregister_sysctl_table - unregister a sysctl table hierarchy
2070 * @header: the header returned from register_sysctl_table
2071 *
2072 * Unregisters the sysctl table and all children. proc entries may not
2073 * actually be removed until they are no longer used by anyone.
2074 */
2075void unregister_sysctl_table(struct ctl_table_header * header)
2076{
330d57fb 2077 might_sleep();
f1dad166
PE		 2078
2079 if (header == NULL)
2080 return;
2081
330d57fb
AV		 2082 spin_lock(&sysctl_lock);
2083 start_unregistering(header);
ae7edecc
AV		 2084 if (!--header->parent->count) {
2085 WARN_ON(1);
2086 kfree(header->parent);
2087 }
f7e6ced4
AV		 2088 if (!--header->count)
2089 kfree(header);
330d57fb 2090 spin_unlock(&sysctl_lock);
1da177e4
LT		 2091}
2092
9043476f
AV		 2093int sysctl_is_seen(struct ctl_table_header *p)
2094{
2095 struct ctl_table_set *set = p->set;
2096 int res;
2097 spin_lock(&sysctl_lock);
2098 if (p->unregistering)
2099 res = 0;
2100 else if (!set->is_seen)
2101 res = 1;
2102 else
2103 res = set->is_seen(set);
2104 spin_unlock(&sysctl_lock);
2105 return res;
2106}
2107
73455092
AV		 2108void setup_sysctl_set(struct ctl_table_set *p,
2109 struct ctl_table_set *parent,
2110 int (*is_seen)(struct ctl_table_set *))
2111{
2112 INIT_LIST_HEAD(&p->list);
2113 p->parent = parent ? parent : &sysctl_table_root.default_set;
2114 p->is_seen = is_seen;
2115}
2116
b89a8171 2117#else /* !CONFIG_SYSCTL */
d8217f07 2118struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2119{
2120 return NULL;
2121}
2122
29e796fd
EB		 2123struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2124 struct ctl_table *table)
2125{
2126 return NULL;
2127}
2128
b89a8171
EB		 2129void unregister_sysctl_table(struct ctl_table_header * table)
2130{
2131}
2132
73455092
AV		 2133void setup_sysctl_set(struct ctl_table_set *p,
2134 struct ctl_table_set *parent,
2135 int (*is_seen)(struct ctl_table_set *))
2136{
2137}
2138
f7e6ced4
AV		 2139void sysctl_head_put(struct ctl_table_header *head)
2140{
2141}
2142
b89a8171
EB		 2143#endif /* CONFIG_SYSCTL */
2144
1da177e4
LT		 2145/*
2146 * /proc/sys support
2147 */
2148
b89a8171 2149#ifdef CONFIG_PROC_SYSCTL
1da177e4 2150
b1ba4ddd
AB		 2151static int _proc_do_string(void* data, int maxlen, int write,
2152 struct file *filp, void __user *buffer,
2153 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2154{
2155 size_t len;
2156 char __user *p;
2157 char c;
8d060877
ON		 2158
2159 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2160 *lenp = 0;
2161 return 0;
2162 }
8d060877 2163
1da177e4
LT		 2164 if (write) {
2165 len = 0;
2166 p = buffer;
2167 while (len < *lenp) {
2168 if (get_user(c, p++))
2169 return -EFAULT;
2170 if (c == 0 || c == '\n')
2171 break;
2172 len++;
2173 }
f5dd3d6f
SV		 2174 if (len >= maxlen)
2175 len = maxlen-1;
2176 if(copy_from_user(data, buffer, len))
1da177e4 2177 return -EFAULT;
f5dd3d6f 2178 ((char *) data)[len] = 0;
1da177e4
LT		 2179 *ppos += *lenp;
2180 } else {
f5dd3d6f
SV		 2181 len = strlen(data);
2182 if (len > maxlen)
2183 len = maxlen;
8d060877
ON		 2184
2185 if (*ppos > len) {
2186 *lenp = 0;
2187 return 0;
2188 }
2189
2190 data += *ppos;
2191 len -= *ppos;
2192
1da177e4
LT		 2193 if (len > *lenp)
2194 len = *lenp;
2195 if (len)
f5dd3d6f 2196 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2197 return -EFAULT;
2198 if (len < *lenp) {
2199 if(put_user('\n', ((char __user *) buffer) + len))
2200 return -EFAULT;
2201 len++;
2202 }
2203 *lenp = len;
2204 *ppos += len;
2205 }
2206 return 0;
2207}
2208
f5dd3d6f
SV		 2209/**
2210 * proc_dostring - read a string sysctl
2211 * @table: the sysctl table
2212 * @write: %TRUE if this is a write to the sysctl file
2213 * @filp: the file structure
2214 * @buffer: the user buffer
2215 * @lenp: the size of the user buffer
2216 * @ppos: file position
2217 *
2218 * Reads/writes a string from/to the user buffer. If the kernel
2219 * buffer provided is not large enough to hold the string, the
2220 * string is truncated. The copied string is %NULL-terminated.
2221 * If the string is being read by the user process, it is copied
2222 * and a newline '\n' is added. It is truncated if the buffer is
2223 * not large enough.
2224 *
2225 * Returns 0 on success.
2226 */
d8217f07 2227int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2228 void __user *buffer, size_t *lenp, loff_t *ppos)
2229{
2230 return _proc_do_string(table->data, table->maxlen, write, filp,
2231 buffer, lenp, ppos);
2232}
2233
1da177e4
LT		 2234
2235static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2236 int *valp,
2237 int write, void *data)
2238{
2239 if (write) {
2240 *valp = *negp ? -*lvalp : *lvalp;
2241 } else {
2242 int val = *valp;
2243 if (val < 0) {
2244 *negp = -1;
2245 *lvalp = (unsigned long)-val;
2246 } else {
2247 *negp = 0;
2248 *lvalp = (unsigned long)val;
2249 }
2250 }
2251 return 0;
2252}
2253
d8217f07 2254static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2255 int write, struct file *filp, void __user *buffer,
2256 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2257 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2258 int write, void *data),
2259 void *data)
2260{
2261#define TMPBUFLEN 21
2262 int *i, vleft, first=1, neg, val;
2263 unsigned long lval;
2264 size_t left, len;
2265
2266 char buf[TMPBUFLEN], *p;
2267 char __user *s = buffer;
2268
fcfbd547 2269 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2270 (*ppos && !write)) {
2271 *lenp = 0;
2272 return 0;
2273 }
2274
fcfbd547 2275 i = (int *) tbl_data;
1da177e4
LT		 2276 vleft = table->maxlen / sizeof(*i);
2277 left = *lenp;
2278
2279 if (!conv)
2280 conv = do_proc_dointvec_conv;
2281
2282 for (; left && vleft--; i++, first=0) {
2283 if (write) {
2284 while (left) {
2285 char c;
2286 if (get_user(c, s))
2287 return -EFAULT;
2288 if (!isspace(c))
2289 break;
2290 left--;
2291 s++;
2292 }
2293 if (!left)
2294 break;
2295 neg = 0;
2296 len = left;
2297 if (len > sizeof(buf) - 1)
2298 len = sizeof(buf) - 1;
2299 if (copy_from_user(buf, s, len))
2300 return -EFAULT;
2301 buf[len] = 0;
2302 p = buf;
2303 if (*p == '-' && left > 1) {
2304 neg = 1;
bd9b0bac 2305 p++;
1da177e4
LT		 2306 }
2307 if (*p < '0' || *p > '9')
2308 break;
2309
2310 lval = simple_strtoul(p, &p, 0);
2311
2312 len = p-buf;
2313 if ((len < left) && *p && !isspace(*p))
2314 break;
2315 if (neg)
2316 val = -val;
2317 s += len;
2318 left -= len;
2319
2320 if (conv(&neg, &lval, i, 1, data))
2321 break;
2322 } else {
2323 p = buf;
2324 if (!first)
2325 *p++ = '\t';
2326
2327 if (conv(&neg, &lval, i, 0, data))
2328 break;
2329
2330 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2331 len = strlen(buf);
2332 if (len > left)
2333 len = left;
2334 if(copy_to_user(s, buf, len))
2335 return -EFAULT;
2336 left -= len;
2337 s += len;
2338 }
2339 }
2340
2341 if (!write && !first && left) {
2342 if(put_user('\n', s))
2343 return -EFAULT;
2344 left--, s++;
2345 }
2346 if (write) {
2347 while (left) {
2348 char c;
2349 if (get_user(c, s++))
2350 return -EFAULT;
2351 if (!isspace(c))
2352 break;
2353 left--;
2354 }
2355 }
2356 if (write && first)
2357 return -EINVAL;
2358 *lenp -= left;
2359 *ppos += *lenp;
2360 return 0;
2361#undef TMPBUFLEN
2362}
2363
d8217f07 2364static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2365 void __user *buffer, size_t *lenp, loff_t *ppos,
2366 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2367 int write, void *data),
2368 void *data)
2369{
2370 return __do_proc_dointvec(table->data, table, write, filp,
2371 buffer, lenp, ppos, conv, data);
2372}
2373
1da177e4
LT		 2374/**
2375 * proc_dointvec - read a vector of integers
2376 * @table: the sysctl table
2377 * @write: %TRUE if this is a write to the sysctl file
2378 * @filp: the file structure
2379 * @buffer: the user buffer
2380 * @lenp: the size of the user buffer
2381 * @ppos: file position
2382 *
2383 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2384 * values from/to the user buffer, treated as an ASCII string.
2385 *
2386 * Returns 0 on success.
2387 */
d8217f07 2388int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2389 void __user *buffer, size_t *lenp, loff_t *ppos)
2390{
2391 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2392 NULL,NULL);
2393}
2394
34f5a398 2395/*
25ddbb18
AK		 2396 * Taint values can only be increased
2397 * This means we can safely use a temporary.
34f5a398 2398 */
25ddbb18 2399static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2400 void __user *buffer, size_t *lenp, loff_t *ppos)
2401{
25ddbb18
AK		 2402 struct ctl_table t;
2403 unsigned long tmptaint = get_taint();
2404 int err;
34f5a398 2405
91fcd412 2406 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2407 return -EPERM;
2408
25ddbb18
AK		 2409 t = *table;
2410 t.data = &tmptaint;
2411 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2412 if (err < 0)
2413 return err;
2414
2415 if (write) {
2416 /*
2417 * Poor man's atomic or. Not worth adding a primitive
2418 * to everyone's atomic.h for this
2419 */
2420 int i;
2421 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2422 if ((tmptaint >> i) & 1)
2423 add_taint(i);
2424 }
2425 }
2426
2427 return err;
34f5a398
TT		 2428}
2429
1da177e4
LT		 2430struct do_proc_dointvec_minmax_conv_param {
2431 int *min;
2432 int *max;
2433};
2434
2435static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2436 int *valp,
2437 int write, void *data)
2438{
2439 struct do_proc_dointvec_minmax_conv_param *param = data;
2440 if (write) {
2441 int val = *negp ? -*lvalp : *lvalp;
2442 if ((param->min && *param->min > val) ||
2443 (param->max && *param->max < val))
2444 return -EINVAL;
2445 *valp = val;
2446 } else {
2447 int val = *valp;
2448 if (val < 0) {
2449 *negp = -1;
2450 *lvalp = (unsigned long)-val;
2451 } else {
2452 *negp = 0;
2453 *lvalp = (unsigned long)val;
2454 }
2455 }
2456 return 0;
2457}
2458
2459/**
2460 * proc_dointvec_minmax - read a vector of integers with min/max values
2461 * @table: the sysctl table
2462 * @write: %TRUE if this is a write to the sysctl file
2463 * @filp: the file structure
2464 * @buffer: the user buffer
2465 * @lenp: the size of the user buffer
2466 * @ppos: file position
2467 *
2468 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2469 * values from/to the user buffer, treated as an ASCII string.
2470 *
2471 * This routine will ensure the values are within the range specified by
2472 * table->extra1 (min) and table->extra2 (max).
2473 *
2474 * Returns 0 on success.
2475 */
d8217f07 2476int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2477 void __user *buffer, size_t *lenp, loff_t *ppos)
2478{
2479 struct do_proc_dointvec_minmax_conv_param param = {
2480 .min = (int *) table->extra1,
2481 .max = (int *) table->extra2,
2482 };
2483 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2484 do_proc_dointvec_minmax_conv, &param);
2485}
2486
d8217f07 2487static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2488 struct file *filp,
2489 void __user *buffer,
2490 size_t *lenp, loff_t *ppos,
2491 unsigned long convmul,
2492 unsigned long convdiv)
2493{
2494#define TMPBUFLEN 21
2495 unsigned long *i, *min, *max, val;
2496 int vleft, first=1, neg;
2497 size_t len, left;
2498 char buf[TMPBUFLEN], *p;
2499 char __user *s = buffer;
2500
fcfbd547 2501 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2502 (*ppos && !write)) {
2503 *lenp = 0;
2504 return 0;
2505 }
2506
fcfbd547 2507 i = (unsigned long *) data;
1da177e4
LT		 2508 min = (unsigned long *) table->extra1;
2509 max = (unsigned long *) table->extra2;
2510 vleft = table->maxlen / sizeof(unsigned long);
2511 left = *lenp;
2512
2513 for (; left && vleft--; i++, min++, max++, first=0) {
2514 if (write) {
2515 while (left) {
2516 char c;
2517 if (get_user(c, s))
2518 return -EFAULT;
2519 if (!isspace(c))
2520 break;
2521 left--;
2522 s++;
2523 }
2524 if (!left)
2525 break;
2526 neg = 0;
2527 len = left;
2528 if (len > TMPBUFLEN-1)
2529 len = TMPBUFLEN-1;
2530 if (copy_from_user(buf, s, len))
2531 return -EFAULT;
2532 buf[len] = 0;
2533 p = buf;
2534 if (*p == '-' && left > 1) {
2535 neg = 1;
bd9b0bac 2536 p++;
1da177e4
LT		 2537 }
2538 if (*p < '0' || *p > '9')
2539 break;
2540 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2541 len = p-buf;
2542 if ((len < left) && *p && !isspace(*p))
2543 break;
2544 if (neg)
2545 val = -val;
2546 s += len;
2547 left -= len;
2548
2549 if(neg)
2550 continue;
2551 if ((min && val < *min) || (max && val > *max))
2552 continue;
2553 *i = val;
2554 } else {
2555 p = buf;
2556 if (!first)
2557 *p++ = '\t';
2558 sprintf(p, "%lu", convdiv * (*i) / convmul);
2559 len = strlen(buf);
2560 if (len > left)
2561 len = left;
2562 if(copy_to_user(s, buf, len))
2563 return -EFAULT;
2564 left -= len;
2565 s += len;
2566 }
2567 }
2568
2569 if (!write && !first && left) {
2570 if(put_user('\n', s))
2571 return -EFAULT;
2572 left--, s++;
2573 }
2574 if (write) {
2575 while (left) {
2576 char c;
2577 if (get_user(c, s++))
2578 return -EFAULT;
2579 if (!isspace(c))
2580 break;
2581 left--;
2582 }
2583 }
2584 if (write && first)
2585 return -EINVAL;
2586 *lenp -= left;
2587 *ppos += *lenp;
2588 return 0;
2589#undef TMPBUFLEN
2590}
2591
d8217f07 2592static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2593 struct file *filp,
2594 void __user *buffer,
2595 size_t *lenp, loff_t *ppos,
2596 unsigned long convmul,
2597 unsigned long convdiv)
2598{
2599 return __do_proc_doulongvec_minmax(table->data, table, write,
2600 filp, buffer, lenp, ppos, convmul, convdiv);
2601}
2602
1da177e4
LT		 2603/**
2604 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2605 * @table: the sysctl table
2606 * @write: %TRUE if this is a write to the sysctl file
2607 * @filp: the file structure
2608 * @buffer: the user buffer
2609 * @lenp: the size of the user buffer
2610 * @ppos: file position
2611 *
2612 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2613 * values from/to the user buffer, treated as an ASCII string.
2614 *
2615 * This routine will ensure the values are within the range specified by
2616 * table->extra1 (min) and table->extra2 (max).
2617 *
2618 * Returns 0 on success.
2619 */
d8217f07 2620int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2621 void __user *buffer, size_t *lenp, loff_t *ppos)
2622{
2623 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2624}
2625
2626/**
2627 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2628 * @table: the sysctl table
2629 * @write: %TRUE if this is a write to the sysctl file
2630 * @filp: the file structure
2631 * @buffer: the user buffer
2632 * @lenp: the size of the user buffer
2633 * @ppos: file position
2634 *
2635 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2636 * values from/to the user buffer, treated as an ASCII string. The values
2637 * are treated as milliseconds, and converted to jiffies when they are stored.
2638 *
2639 * This routine will ensure the values are within the range specified by
2640 * table->extra1 (min) and table->extra2 (max).
2641 *
2642 * Returns 0 on success.
2643 */
d8217f07 2644int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2645 struct file *filp,
2646 void __user *buffer,
2647 size_t *lenp, loff_t *ppos)
2648{
2649 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2650 lenp, ppos, HZ, 1000l);
2651}
2652
2653
2654static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2655 int *valp,
2656 int write, void *data)
2657{
2658 if (write) {
cba9f33d
BS		 2659 if (*lvalp > LONG_MAX / HZ)
2660 return 1;
1da177e4
LT		 2661 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2662 } else {
2663 int val = *valp;
2664 unsigned long lval;
2665 if (val < 0) {
2666 *negp = -1;
2667 lval = (unsigned long)-val;
2668 } else {
2669 *negp = 0;
2670 lval = (unsigned long)val;
2671 }
2672 *lvalp = lval / HZ;
2673 }
2674 return 0;
2675}
2676
2677static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2678 int *valp,
2679 int write, void *data)
2680{
2681 if (write) {
cba9f33d
BS		 2682 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2683 return 1;
1da177e4
LT		 2684 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2685 } else {
2686 int val = *valp;
2687 unsigned long lval;
2688 if (val < 0) {
2689 *negp = -1;
2690 lval = (unsigned long)-val;
2691 } else {
2692 *negp = 0;
2693 lval = (unsigned long)val;
2694 }
2695 *lvalp = jiffies_to_clock_t(lval);
2696 }
2697 return 0;
2698}
2699
2700static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2701 int *valp,
2702 int write, void *data)
2703{
2704 if (write) {
2705 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2706 } else {
2707 int val = *valp;
2708 unsigned long lval;
2709 if (val < 0) {
2710 *negp = -1;
2711 lval = (unsigned long)-val;
2712 } else {
2713 *negp = 0;
2714 lval = (unsigned long)val;
2715 }
2716 *lvalp = jiffies_to_msecs(lval);
2717 }
2718 return 0;
2719}
2720
2721/**
2722 * proc_dointvec_jiffies - read a vector of integers as seconds
2723 * @table: the sysctl table
2724 * @write: %TRUE if this is a write to the sysctl file
2725 * @filp: the file structure
2726 * @buffer: the user buffer
2727 * @lenp: the size of the user buffer
2728 * @ppos: file position
2729 *
2730 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2731 * values from/to the user buffer, treated as an ASCII string.
2732 * The values read are assumed to be in seconds, and are converted into
2733 * jiffies.
2734 *
2735 * Returns 0 on success.
2736 */
d8217f07 2737int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2738 void __user *buffer, size_t *lenp, loff_t *ppos)
2739{
2740 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2741 do_proc_dointvec_jiffies_conv,NULL);
2742}
2743
2744/**
2745 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2746 * @table: the sysctl table
2747 * @write: %TRUE if this is a write to the sysctl file
2748 * @filp: the file structure
2749 * @buffer: the user buffer
2750 * @lenp: the size of the user buffer
1e5d5331 2751 * @ppos: pointer to the file position
1da177e4
LT		 2752 *
2753 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2754 * values from/to the user buffer, treated as an ASCII string.
2755 * The values read are assumed to be in 1/USER_HZ seconds, and
2756 * are converted into jiffies.
2757 *
2758 * Returns 0 on success.
2759 */
d8217f07 2760int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2761 void __user *buffer, size_t *lenp, loff_t *ppos)
2762{
2763 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2764 do_proc_dointvec_userhz_jiffies_conv,NULL);
2765}
2766
2767/**
2768 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2769 * @table: the sysctl table
2770 * @write: %TRUE if this is a write to the sysctl file
2771 * @filp: the file structure
2772 * @buffer: the user buffer
2773 * @lenp: the size of the user buffer
67be2dd1
MW		 2774 * @ppos: file position
2775 * @ppos: the current position in the file
1da177e4
LT		 2776 *
2777 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2778 * values from/to the user buffer, treated as an ASCII string.
2779 * The values read are assumed to be in 1/1000 seconds, and
2780 * are converted into jiffies.
2781 *
2782 * Returns 0 on success.
2783 */
d8217f07 2784int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2785 void __user *buffer, size_t *lenp, loff_t *ppos)
2786{
2787 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2788 do_proc_dointvec_ms_jiffies_conv, NULL);
2789}
2790
d8217f07 2791static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2792 void __user *buffer, size_t *lenp, loff_t *ppos)
2793{
2794 struct pid *new_pid;
2795 pid_t tmp;
2796 int r;
2797
6c5f3e7b 2798 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2799
2800 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2801 lenp, ppos, NULL, NULL);
2802 if (r || !write)
2803 return r;
2804
2805 new_pid = find_get_pid(tmp);
2806 if (!new_pid)
2807 return -ESRCH;
2808
2809 put_pid(xchg(&cad_pid, new_pid));
2810 return 0;
2811}
2812
1da177e4
LT		 2813#else /* CONFIG_PROC_FS */
2814
d8217f07 2815int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2816 void __user *buffer, size_t *lenp, loff_t *ppos)
2817{
2818 return -ENOSYS;
2819}
2820
d8217f07 2821int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2822 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2823{
2824 return -ENOSYS;
2825}
2826
d8217f07 2827int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2828 void __user *buffer, size_t *lenp, loff_t *ppos)
2829{
2830 return -ENOSYS;
2831}
2832
d8217f07 2833int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2834 void __user *buffer, size_t *lenp, loff_t *ppos)
2835{
2836 return -ENOSYS;
2837}
2838
d8217f07 2839int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2840 void __user *buffer, size_t *lenp, loff_t *ppos)
2841{
2842 return -ENOSYS;
2843}
2844
d8217f07 2845int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2846 void __user *buffer, size_t *lenp, loff_t *ppos)
2847{
2848 return -ENOSYS;
2849}
2850
d8217f07 2851int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2852 void __user *buffer, size_t *lenp, loff_t *ppos)
2853{
2854 return -ENOSYS;
2855}
2856
d8217f07 2857int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2858 struct file *filp,
2859 void __user *buffer,
2860 size_t *lenp, loff_t *ppos)
2861{
2862 return -ENOSYS;
2863}
2864
2865
2866#endif /* CONFIG_PROC_FS */
2867
2868
b89a8171 2869#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2870/*
2871 * General sysctl support routines
2872 */
2873
49a0c458 2874/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2875int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2876 void __user *oldval, size_t __user *oldlenp,
2877 void __user *newval, size_t newlen)
2878{
2879 size_t len;
2880
2881 /* Get out of I don't have a variable */
2882 if (!table->data || !table->maxlen)
2883 return -ENOTDIR;
2884
2885 if (oldval && oldlenp) {
2886 if (get_user(len, oldlenp))
2887 return -EFAULT;
2888 if (len) {
2889 if (len > table->maxlen)
2890 len = table->maxlen;
2891 if (copy_to_user(oldval, table->data, len))
2892 return -EFAULT;
2893 if (put_user(len, oldlenp))
2894 return -EFAULT;
2895 }
2896 }
2897
2898 if (newval && newlen) {
2899 if (newlen > table->maxlen)
2900 newlen = table->maxlen;
2901
2902 if (copy_from_user(table->data, newval, newlen))
2903 return -EFAULT;
2904 }
2905 return 1;
2906}
2907
1da177e4 2908/* The generic string strategy routine: */
f221e726 2909int sysctl_string(struct ctl_table *table,
1da177e4 2910 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2911 void __user *newval, size_t newlen)
1da177e4 2912{
1da177e4
LT		 2913 if (!table->data || !table->maxlen)
2914 return -ENOTDIR;
2915
2916 if (oldval && oldlenp) {
de9e007d
LT		 2917 size_t bufsize;
2918 if (get_user(bufsize, oldlenp))
1da177e4 2919 return -EFAULT;
de9e007d
LT		 2920 if (bufsize) {
2921 size_t len = strlen(table->data), copied;
2922
2923 /* This shouldn't trigger for a well-formed sysctl */
2924 if (len > table->maxlen)
1da177e4 2925 len = table->maxlen;
de9e007d
LT		 2926
2927 /* Copy up to a max of bufsize-1 bytes of the string */
2928 copied = (len >= bufsize) ? bufsize - 1 : len;
2929
2930 if (copy_to_user(oldval, table->data, copied) ||
2931 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2932 return -EFAULT;
de9e007d 2933 if (put_user(len, oldlenp))
1da177e4
LT		 2934 return -EFAULT;
2935 }
2936 }
2937 if (newval && newlen) {
de9e007d 2938 size_t len = newlen;
1da177e4
LT		 2939 if (len > table->maxlen)
2940 len = table->maxlen;
2941 if(copy_from_user(table->data, newval, len))
2942 return -EFAULT;
2943 if (len == table->maxlen)
2944 len--;
2945 ((char *) table->data)[len] = 0;
2946 }
82c9df82 2947 return 1;
1da177e4
LT		 2948}
2949
2950/*
2951 * This function makes sure that all of the integers in the vector
2952 * are between the minimum and maximum values given in the arrays
2953 * table->extra1 and table->extra2, respectively.
2954 */
f221e726 2955int sysctl_intvec(struct ctl_table *table,
1da177e4 2956 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2957 void __user *newval, size_t newlen)
1da177e4
LT		 2958{
2959
2960 if (newval && newlen) {
2961 int __user *vec = (int __user *) newval;
2962 int *min = (int *) table->extra1;
2963 int *max = (int *) table->extra2;
2964 size_t length;
2965 int i;
2966
2967 if (newlen % sizeof(int) != 0)
2968 return -EINVAL;
2969
2970 if (!table->extra1 && !table->extra2)
2971 return 0;
2972
2973 if (newlen > table->maxlen)
2974 newlen = table->maxlen;
2975 length = newlen / sizeof(int);
2976
2977 for (i = 0; i < length; i++) {
2978 int value;
2979 if (get_user(value, vec + i))
2980 return -EFAULT;
2981 if (min && value < min[i])
2982 return -EINVAL;
2983 if (max && value > max[i])
2984 return -EINVAL;
2985 }
2986 }
2987 return 0;
2988}
2989
2990/* Strategy function to convert jiffies to seconds */
f221e726 2991int sysctl_jiffies(struct ctl_table *table,
1da177e4 2992 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2993 void __user *newval, size_t newlen)
1da177e4 2994{
3ee75ac3 2995 if (oldval && oldlenp) {
1da177e4 2996 size_t olen;
3ee75ac3
AD		 2997
2998 if (get_user(olen, oldlenp))
2999 return -EFAULT;
3000 if (olen) {
3001 int val;
3002
3003 if (olen < sizeof(int))
3004 return -EINVAL;
3005
3006 val = *(int *)(table->data) / HZ;
3007 if (put_user(val, (int __user *)oldval))
3008 return -EFAULT;
3009 if (put_user(sizeof(int), oldlenp))
1da177e4 3010 return -EFAULT;
1da177e4 3011 }
1da177e4
LT		 3012 }
3013 if (newval && newlen) {
3014 int new;
3015 if (newlen != sizeof(int))
3016 return -EINVAL;
3017 if (get_user(new, (int __user *)newval))
3018 return -EFAULT;
3019 *(int *)(table->data) = new*HZ;
3020 }
3021 return 1;
3022}
3023
3024/* Strategy function to convert jiffies to seconds */
f221e726 3025int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3026 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3027 void __user *newval, size_t newlen)
1da177e4 3028{
3ee75ac3 3029 if (oldval && oldlenp) {
1da177e4 3030 size_t olen;
3ee75ac3
AD		 3031
3032 if (get_user(olen, oldlenp))
3033 return -EFAULT;
3034 if (olen) {
3035 int val;
3036
3037 if (olen < sizeof(int))
3038 return -EINVAL;
3039
3040 val = jiffies_to_msecs(*(int *)(table->data));
3041 if (put_user(val, (int __user *)oldval))
3042 return -EFAULT;
3043 if (put_user(sizeof(int), oldlenp))
1da177e4 3044 return -EFAULT;
1da177e4 3045 }
1da177e4
LT		 3046 }
3047 if (newval && newlen) {
3048 int new;
3049 if (newlen != sizeof(int))
3050 return -EINVAL;
3051 if (get_user(new, (int __user *)newval))
3052 return -EFAULT;
3053 *(int *)(table->data) = msecs_to_jiffies(new);
3054 }
3055 return 1;
3056}
3057
c4b8b769 3058
c4b8b769 3059
b89a8171 3060#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3061
3062
1e7bfb21 3063SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3064{
0e009be8 3065 struct __sysctl_args tmp;
7058cb02 3066 int error;
0e009be8 3067
0e009be8
EB		 3068 if (copy_from_user(&tmp, args, sizeof(tmp)))
3069 return -EFAULT;
0e009be8 3070
7058cb02 3071 error = deprecated_sysctl_warning(&tmp);
b89a8171 3072
7058cb02
EB		 3073 /* If no error reading the parameters then just -ENOSYS ... */
3074 if (!error)
3075 error = -ENOSYS;
3076
3077 return error;
1da177e4
LT		 3078}
3079
f221e726 3080int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3081 void __user *oldval, size_t __user *oldlenp,
3082 void __user *newval, size_t newlen)
3083{
3084 return -ENOSYS;
3085}
3086
f221e726 3087int sysctl_string(struct ctl_table *table,
1da177e4 3088 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3089 void __user *newval, size_t newlen)
1da177e4
LT		 3090{
3091 return -ENOSYS;
3092}
3093
f221e726 3094int sysctl_intvec(struct ctl_table *table,
1da177e4 3095 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3096 void __user *newval, size_t newlen)
1da177e4
LT		 3097{
3098 return -ENOSYS;
3099}
3100
f221e726 3101int sysctl_jiffies(struct ctl_table *table,
1da177e4 3102 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3103 void __user *newval, size_t newlen)
1da177e4
LT		 3104{
3105 return -ENOSYS;
3106}
3107
f221e726 3108int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3109 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3110 void __user *newval, size_t newlen)
1da177e4
LT		 3111{
3112 return -ENOSYS;
3113}
3114
b89a8171 3115#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3116
7058cb02
EB		 3117static int deprecated_sysctl_warning(struct __sysctl_args *args)
3118{
3119 static int msg_count;
3120 int name[CTL_MAXNAME];
3121 int i;
3122
6fc48af8
TH		 3123 /* Check args->nlen. */
3124 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3125 return -ENOTDIR;
3126
7058cb02
EB		 3127 /* Read in the sysctl name for better debug message logging */
3128 for (i = 0; i < args->nlen; i++)
3129 if (get_user(name[i], args->name + i))
3130 return -EFAULT;
3131
3132 /* Ignore accesses to kernel.version */
3133 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3134 return 0;
3135
3136 if (msg_count < 5) {
3137 msg_count++;
3138 printk(KERN_INFO
3139 "warning: process `%s' used the deprecated sysctl "
3140 "system call with ", current->comm);
3141 for (i = 0; i < args->nlen; i++)
3142 printk("%d.", name[i]);
3143 printk("\n");
3144 }
3145 return 0;
3146}
3147
1da177e4
LT		 3148/*
3149 * No sense putting this after each symbol definition, twice,
3150 * exception granted :-)
3151 */
3152EXPORT_SYMBOL(proc_dointvec);
3153EXPORT_SYMBOL(proc_dointvec_jiffies);
3154EXPORT_SYMBOL(proc_dointvec_minmax);
3155EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3156EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3157EXPORT_SYMBOL(proc_dostring);
3158EXPORT_SYMBOL(proc_doulongvec_minmax);
3159EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3160EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3161EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3162EXPORT_SYMBOL(sysctl_intvec);
3163EXPORT_SYMBOL(sysctl_jiffies);
3164EXPORT_SYMBOL(sysctl_ms_jiffies);
3165EXPORT_SYMBOL(sysctl_string);
49a0c458 3166EXPORT_SYMBOL(sysctl_data);
1da177e4 3167EXPORT_SYMBOL(unregister_sysctl_table);
Linux kernel - Deliverables
This page took 0.837149 seconds and 5 git commands to generate.