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Merge branch 'tracing-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[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>
1da177e4
LT		 52
53#include <asm/uaccess.h>
54#include <asm/processor.h>
55
29cbc78b
AK		 56#ifdef CONFIG_X86
57#include <asm/nmi.h>
0741f4d2 58#include <asm/stacktrace.h>
6e7c4025 59#include <asm/io.h>
29cbc78b
AK		 60#endif
61
7058cb02
EB		 62static int deprecated_sysctl_warning(struct __sysctl_args *args);
63
1da177e4
LT		 64#if defined(CONFIG_SYSCTL)
65
66/* External variables not in a header file. */
67extern int C_A_D;
45807a1d 68extern int print_fatal_signals;
1da177e4
LT		 69extern int sysctl_overcommit_memory;
70extern int sysctl_overcommit_ratio;
fadd8fbd 71extern int sysctl_panic_on_oom;
fe071d7e 72extern int sysctl_oom_kill_allocating_task;
fef1bdd6 73extern int sysctl_oom_dump_tasks;
1da177e4 74extern int max_threads;
1da177e4 75extern int core_uses_pid;
d6e71144 76extern int suid_dumpable;
1da177e4 77extern char core_pattern[];
1da177e4
LT		 78extern int pid_max;
79extern int min_free_kbytes;
1da177e4 80extern int pid_max_min, pid_max_max;
9d0243bc 81extern int sysctl_drop_caches;
8ad4b1fb 82extern int percpu_pagelist_fraction;
bebfa101 83extern int compat_log;
9745512c 84extern int latencytop_enabled;
eceea0b3 85extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 86#ifndef CONFIG_MMU
87extern int sysctl_nr_trim_pages;
88#endif
31a72bce
PM		 89#ifdef CONFIG_RCU_TORTURE_TEST
90extern int rcutorture_runnable;
91#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 92
c4f3b63f 93/* Constants used for minimum and maximum */
195cf453 94#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 95static int sixty = 60;
9383d967 96static int neg_one = -1;
c4f3b63f
RT		 97#endif
98
c4f3b63f 99static int zero;
cd5f9a4c
LT		 100static int __maybe_unused one = 1;
101static int __maybe_unused two = 2;
fc3501d4 102static unsigned long one_ul = 1;
c4f3b63f
RT		 103static int one_hundred = 100;
104
9e4a5bda
AR		 105/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
106static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
107
1da177e4
LT		 108/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
109static int maxolduid = 65535;
110static int minolduid;
8ad4b1fb 111static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 112
113static int ngroups_max = NGROUPS_MAX;
114
a1ef5adb 115#ifdef CONFIG_MODULES
1da177e4
LT		 116extern char modprobe_path[];
117#endif
1da177e4
LT		 118#ifdef CONFIG_CHR_DEV_SG
119extern int sg_big_buff;
120#endif
1da177e4 121
72c57ed5 122#ifdef CONFIG_SPARC
17f04fbb 123#include <asm/system.h>
1da177e4
LT		 124#endif
125
0871420f
DM		 126#ifdef CONFIG_SPARC64
127extern int sysctl_tsb_ratio;
128#endif
129
1da177e4
LT		 130#ifdef __hppa__
131extern int pwrsw_enabled;
132extern int unaligned_enabled;
133#endif
134
347a8dc3 135#ifdef CONFIG_S390
1da177e4
LT		 136#ifdef CONFIG_MATHEMU
137extern int sysctl_ieee_emulation_warnings;
138#endif
139extern int sysctl_userprocess_debug;
951f22d5 140extern int spin_retry;
1da177e4
LT		 141#endif
142
1da177e4
LT		 143#ifdef CONFIG_BSD_PROCESS_ACCT
144extern int acct_parm[];
145#endif
146
d2b176ed
JS		 147#ifdef CONFIG_IA64
148extern int no_unaligned_warning;
88fc241f 149extern int unaligned_dump_stack;
d2b176ed
JS		 150#endif
151
23f78d4a
IM		 152#ifdef CONFIG_RT_MUTEXES
153extern int max_lock_depth;
154#endif
155
d6f8ff73 156#ifdef CONFIG_PROC_SYSCTL
d8217f07 157static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 158 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 159static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 160 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 161#endif
9ec52099 162
d8217f07 163static struct ctl_table root_table[];
e51b6ba0
EB		 164static struct ctl_table_root sysctl_table_root;
165static struct ctl_table_header root_table_header = {
b380b0d4 166 .count = 1,
e51b6ba0 167 .ctl_table = root_table,
73455092 168 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 169 .root = &sysctl_table_root,
73455092 170 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 171};
172static struct ctl_table_root sysctl_table_root = {
173 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 174 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 175};
1da177e4 176
d8217f07
EB		 177static struct ctl_table kern_table[];
178static struct ctl_table vm_table[];
179static struct ctl_table fs_table[];
180static struct ctl_table debug_table[];
181static struct ctl_table dev_table[];
182extern struct ctl_table random_table[];
2d9048e2 183#ifdef CONFIG_INOTIFY_USER
d8217f07 184extern struct ctl_table inotify_table[];
0399cb08 185#endif
7ef9964e
DL		 186#ifdef CONFIG_EPOLL
187extern struct ctl_table epoll_table[];
188#endif
1da177e4
LT		 189
190#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
191int sysctl_legacy_va_layout;
192#endif
193
f20786ff
PZ		 194extern int prove_locking;
195extern int lock_stat;
9bc9a6bd 196
1da177e4
LT		 197/* The default sysctl tables: */
198
d8217f07 199static struct ctl_table root_table[] = {
1da177e4
LT		 200 {
201 .ctl_name = CTL_KERN,
202 .procname = "kernel",
203 .mode = 0555,
204 .child = kern_table,
205 },
206 {
207 .ctl_name = CTL_VM,
208 .procname = "vm",
209 .mode = 0555,
210 .child = vm_table,
211 },
1da177e4
LT		 212 {
213 .ctl_name = CTL_FS,
214 .procname = "fs",
215 .mode = 0555,
216 .child = fs_table,
217 },
218 {
219 .ctl_name = CTL_DEBUG,
220 .procname = "debug",
221 .mode = 0555,
222 .child = debug_table,
223 },
224 {
225 .ctl_name = CTL_DEV,
226 .procname = "dev",
227 .mode = 0555,
228 .child = dev_table,
229 },
2be7fe07
AM		 230/*
231 * NOTE: do not add new entries to this table unless you have read
232 * Documentation/sysctl/ctl_unnumbered.txt
233 */
1da177e4
LT		 234 { .ctl_name = 0 }
235};
236
77e54a1f 237#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 238static int min_sched_granularity_ns = 100000; /* 100 usecs */
239static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
240static int min_wakeup_granularity_ns; /* 0 usecs */
241static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 242#endif
243
d8217f07 244static struct ctl_table kern_table[] = {
77e54a1f
IM		 245#ifdef CONFIG_SCHED_DEBUG
246 {
247 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 248 .procname = "sched_min_granularity_ns",
249 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 250 .maxlen = sizeof(unsigned int),
251 .mode = 0644,
b2be5e96
PZ		 252 .proc_handler = &sched_nr_latency_handler,
253 .strategy = &sysctl_intvec,
254 .extra1 = &min_sched_granularity_ns,
255 .extra2 = &max_sched_granularity_ns,
77e54a1f 256 },
21805085
PZ		 257 {
258 .ctl_name = CTL_UNNUMBERED,
259 .procname = "sched_latency_ns",
260 .data = &sysctl_sched_latency,
261 .maxlen = sizeof(unsigned int),
262 .mode = 0644,
b2be5e96 263 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 264 .strategy = &sysctl_intvec,
265 .extra1 = &min_sched_granularity_ns,
266 .extra2 = &max_sched_granularity_ns,
267 },
77e54a1f
IM		 268 {
269 .ctl_name = CTL_UNNUMBERED,
270 .procname = "sched_wakeup_granularity_ns",
271 .data = &sysctl_sched_wakeup_granularity,
272 .maxlen = sizeof(unsigned int),
273 .mode = 0644,
274 .proc_handler = &proc_dointvec_minmax,
275 .strategy = &sysctl_intvec,
77e54a1f
IM		 276 .extra1 = &min_wakeup_granularity_ns,
277 .extra2 = &max_wakeup_granularity_ns,
278 },
2398f2c6
PZ		 279 {
280 .ctl_name = CTL_UNNUMBERED,
281 .procname = "sched_shares_ratelimit",
282 .data = &sysctl_sched_shares_ratelimit,
283 .maxlen = sizeof(unsigned int),
284 .mode = 0644,
285 .proc_handler = &proc_dointvec,
286 },
ffda12a1
PZ		 287 {
288 .ctl_name = CTL_UNNUMBERED,
289 .procname = "sched_shares_thresh",
290 .data = &sysctl_sched_shares_thresh,
291 .maxlen = sizeof(unsigned int),
292 .mode = 0644,
293 .proc_handler = &proc_dointvec_minmax,
294 .strategy = &sysctl_intvec,
295 .extra1 = &zero,
296 },
77e54a1f
IM		 297 {
298 .ctl_name = CTL_UNNUMBERED,
299 .procname = "sched_child_runs_first",
300 .data = &sysctl_sched_child_runs_first,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = &proc_dointvec,
304 },
1fc84aaa
PZ		 305 {
306 .ctl_name = CTL_UNNUMBERED,
307 .procname = "sched_features",
308 .data = &sysctl_sched_features,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
311 .proc_handler = &proc_dointvec,
312 },
da84d961
IM		 313 {
314 .ctl_name = CTL_UNNUMBERED,
315 .procname = "sched_migration_cost",
316 .data = &sysctl_sched_migration_cost,
317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
319 .proc_handler = &proc_dointvec,
320 },
b82d9fdd
PZ		 321 {
322 .ctl_name = CTL_UNNUMBERED,
323 .procname = "sched_nr_migrate",
324 .data = &sysctl_sched_nr_migrate,
325 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 326 .mode = 0644,
327 .proc_handler = &proc_dointvec,
328 },
1fc84aaa 329#endif
9f0c1e56
PZ		 330 {
331 .ctl_name = CTL_UNNUMBERED,
332 .procname = "sched_rt_period_us",
333 .data = &sysctl_sched_rt_period,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
d0b27fa7 336 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 337 },
338 {
339 .ctl_name = CTL_UNNUMBERED,
340 .procname = "sched_rt_runtime_us",
341 .data = &sysctl_sched_rt_runtime,
342 .maxlen = sizeof(int),
343 .mode = 0644,
d0b27fa7 344 .proc_handler = &sched_rt_handler,
9f0c1e56 345 },
1799e35d
IM		 346 {
347 .ctl_name = CTL_UNNUMBERED,
348 .procname = "sched_compat_yield",
349 .data = &sysctl_sched_compat_yield,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = &proc_dointvec,
353 },
f20786ff
PZ		 354#ifdef CONFIG_PROVE_LOCKING
355 {
356 .ctl_name = CTL_UNNUMBERED,
357 .procname = "prove_locking",
358 .data = &prove_locking,
359 .maxlen = sizeof(int),
360 .mode = 0644,
361 .proc_handler = &proc_dointvec,
362 },
363#endif
364#ifdef CONFIG_LOCK_STAT
365 {
366 .ctl_name = CTL_UNNUMBERED,
367 .procname = "lock_stat",
368 .data = &lock_stat,
369 .maxlen = sizeof(int),
370 .mode = 0644,
371 .proc_handler = &proc_dointvec,
372 },
77e54a1f 373#endif
1da177e4
LT		 374 {
375 .ctl_name = KERN_PANIC,
376 .procname = "panic",
377 .data = &panic_timeout,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = &proc_dointvec,
381 },
382 {
383 .ctl_name = KERN_CORE_USES_PID,
384 .procname = "core_uses_pid",
385 .data = &core_uses_pid,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = &proc_dointvec,
389 },
390 {
391 .ctl_name = KERN_CORE_PATTERN,
392 .procname = "core_pattern",
393 .data = core_pattern,
71ce92f3 394 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 395 .mode = 0644,
396 .proc_handler = &proc_dostring,
397 .strategy = &sysctl_string,
398 },
34f5a398 399#ifdef CONFIG_PROC_SYSCTL
1da177e4 400 {
1da177e4 401 .procname = "tainted",
25ddbb18 402 .maxlen = sizeof(long),
34f5a398 403 .mode = 0644,
25ddbb18 404 .proc_handler = &proc_taint,
1da177e4 405 },
34f5a398 406#endif
9745512c
AV		 407#ifdef CONFIG_LATENCYTOP
408 {
409 .procname = "latencytop",
410 .data = &latencytop_enabled,
411 .maxlen = sizeof(int),
412 .mode = 0644,
413 .proc_handler = &proc_dointvec,
414 },
415#endif
1da177e4
LT		 416#ifdef CONFIG_BLK_DEV_INITRD
417 {
418 .ctl_name = KERN_REALROOTDEV,
419 .procname = "real-root-dev",
420 .data = &real_root_dev,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = &proc_dointvec,
424 },
425#endif
45807a1d
IM		 426 {
427 .ctl_name = CTL_UNNUMBERED,
428 .procname = "print-fatal-signals",
429 .data = &print_fatal_signals,
430 .maxlen = sizeof(int),
431 .mode = 0644,
432 .proc_handler = &proc_dointvec,
433 },
72c57ed5 434#ifdef CONFIG_SPARC
1da177e4
LT		 435 {
436 .ctl_name = KERN_SPARC_REBOOT,
437 .procname = "reboot-cmd",
438 .data = reboot_command,
439 .maxlen = 256,
440 .mode = 0644,
441 .proc_handler = &proc_dostring,
442 .strategy = &sysctl_string,
443 },
444 {
445 .ctl_name = KERN_SPARC_STOP_A,
446 .procname = "stop-a",
447 .data = &stop_a_enabled,
448 .maxlen = sizeof (int),
449 .mode = 0644,
450 .proc_handler = &proc_dointvec,
451 },
452 {
453 .ctl_name = KERN_SPARC_SCONS_PWROFF,
454 .procname = "scons-poweroff",
455 .data = &scons_pwroff,
456 .maxlen = sizeof (int),
457 .mode = 0644,
458 .proc_handler = &proc_dointvec,
459 },
460#endif
0871420f
DM		 461#ifdef CONFIG_SPARC64
462 {
463 .ctl_name = CTL_UNNUMBERED,
464 .procname = "tsb-ratio",
465 .data = &sysctl_tsb_ratio,
466 .maxlen = sizeof (int),
467 .mode = 0644,
468 .proc_handler = &proc_dointvec,
469 },
470#endif
1da177e4
LT		 471#ifdef __hppa__
472 {
473 .ctl_name = KERN_HPPA_PWRSW,
474 .procname = "soft-power",
475 .data = &pwrsw_enabled,
476 .maxlen = sizeof (int),
477 .mode = 0644,
478 .proc_handler = &proc_dointvec,
479 },
480 {
481 .ctl_name = KERN_HPPA_UNALIGNED,
482 .procname = "unaligned-trap",
483 .data = &unaligned_enabled,
484 .maxlen = sizeof (int),
485 .mode = 0644,
486 .proc_handler = &proc_dointvec,
487 },
488#endif
489 {
490 .ctl_name = KERN_CTLALTDEL,
491 .procname = "ctrl-alt-del",
492 .data = &C_A_D,
493 .maxlen = sizeof(int),
494 .mode = 0644,
495 .proc_handler = &proc_dointvec,
496 },
606576ce 497#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 498 {
499 .ctl_name = CTL_UNNUMBERED,
500 .procname = "ftrace_enabled",
501 .data = &ftrace_enabled,
502 .maxlen = sizeof(int),
503 .mode = 0644,
504 .proc_handler = &ftrace_enable_sysctl,
505 },
506#endif
f38f1d2a
SR		 507#ifdef CONFIG_STACK_TRACER
508 {
509 .ctl_name = CTL_UNNUMBERED,
510 .procname = "stack_tracer_enabled",
511 .data = &stack_tracer_enabled,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = &stack_trace_sysctl,
515 },
516#endif
944ac425
SR		 517#ifdef CONFIG_TRACING
518 {
519 .ctl_name = CTL_UNNUMBERED,
3299b4dd 520 .procname = "ftrace_dump_on_oops",
944ac425
SR		 521 .data = &ftrace_dump_on_oops,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = &proc_dointvec,
525 },
526#endif
a1ef5adb 527#ifdef CONFIG_MODULES
1da177e4
LT		 528 {
529 .ctl_name = KERN_MODPROBE,
530 .procname = "modprobe",
531 .data = &modprobe_path,
532 .maxlen = KMOD_PATH_LEN,
533 .mode = 0644,
534 .proc_handler = &proc_dostring,
535 .strategy = &sysctl_string,
536 },
537#endif
57ae2508 538#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 539 {
540 .ctl_name = KERN_HOTPLUG,
541 .procname = "hotplug",
312c004d
KS		 542 .data = &uevent_helper,
543 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 544 .mode = 0644,
545 .proc_handler = &proc_dostring,
546 .strategy = &sysctl_string,
547 },
548#endif
549#ifdef CONFIG_CHR_DEV_SG
550 {
551 .ctl_name = KERN_SG_BIG_BUFF,
552 .procname = "sg-big-buff",
553 .data = &sg_big_buff,
554 .maxlen = sizeof (int),
555 .mode = 0444,
556 .proc_handler = &proc_dointvec,
557 },
558#endif
559#ifdef CONFIG_BSD_PROCESS_ACCT
560 {
561 .ctl_name = KERN_ACCT,
562 .procname = "acct",
563 .data = &acct_parm,
564 .maxlen = 3*sizeof(int),
565 .mode = 0644,
566 .proc_handler = &proc_dointvec,
567 },
568#endif
1da177e4
LT		 569#ifdef CONFIG_MAGIC_SYSRQ
570 {
571 .ctl_name = KERN_SYSRQ,
572 .procname = "sysrq",
5d6f647f 573 .data = &__sysrq_enabled,
1da177e4
LT		 574 .maxlen = sizeof (int),
575 .mode = 0644,
576 .proc_handler = &proc_dointvec,
577 },
578#endif
d6f8ff73 579#ifdef CONFIG_PROC_SYSCTL
1da177e4 580 {
1da177e4 581 .procname = "cad_pid",
9ec52099 582 .data = NULL,
1da177e4
LT		 583 .maxlen = sizeof (int),
584 .mode = 0600,
9ec52099 585 .proc_handler = &proc_do_cad_pid,
1da177e4 586 },
d6f8ff73 587#endif
1da177e4
LT		 588 {
589 .ctl_name = KERN_MAX_THREADS,
590 .procname = "threads-max",
591 .data = &max_threads,
592 .maxlen = sizeof(int),
593 .mode = 0644,
594 .proc_handler = &proc_dointvec,
595 },
596 {
597 .ctl_name = KERN_RANDOM,
598 .procname = "random",
599 .mode = 0555,
600 .child = random_table,
601 },
1da177e4
LT		 602 {
603 .ctl_name = KERN_OVERFLOWUID,
604 .procname = "overflowuid",
605 .data = &overflowuid,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = &proc_dointvec_minmax,
609 .strategy = &sysctl_intvec,
610 .extra1 = &minolduid,
611 .extra2 = &maxolduid,
612 },
613 {
614 .ctl_name = KERN_OVERFLOWGID,
615 .procname = "overflowgid",
616 .data = &overflowgid,
617 .maxlen = sizeof(int),
618 .mode = 0644,
619 .proc_handler = &proc_dointvec_minmax,
620 .strategy = &sysctl_intvec,
621 .extra1 = &minolduid,
622 .extra2 = &maxolduid,
623 },
347a8dc3 624#ifdef CONFIG_S390
1da177e4
LT		 625#ifdef CONFIG_MATHEMU
626 {
627 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
628 .procname = "ieee_emulation_warnings",
629 .data = &sysctl_ieee_emulation_warnings,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = &proc_dointvec,
633 },
1da177e4
LT		 634#endif
635 {
636 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
637 .procname = "userprocess_debug",
638 .data = &sysctl_userprocess_debug,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 .proc_handler = &proc_dointvec,
642 },
643#endif
644 {
645 .ctl_name = KERN_PIDMAX,
646 .procname = "pid_max",
647 .data = &pid_max,
648 .maxlen = sizeof (int),
649 .mode = 0644,
650 .proc_handler = &proc_dointvec_minmax,
651 .strategy = sysctl_intvec,
652 .extra1 = &pid_max_min,
653 .extra2 = &pid_max_max,
654 },
655 {
656 .ctl_name = KERN_PANIC_ON_OOPS,
657 .procname = "panic_on_oops",
658 .data = &panic_on_oops,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = &proc_dointvec,
662 },
7ef3d2fd
JP		 663#if defined CONFIG_PRINTK
664 {
665 .ctl_name = KERN_PRINTK,
666 .procname = "printk",
667 .data = &console_loglevel,
668 .maxlen = 4*sizeof(int),
669 .mode = 0644,
670 .proc_handler = &proc_dointvec,
671 },
1da177e4
LT		 672 {
673 .ctl_name = KERN_PRINTK_RATELIMIT,
674 .procname = "printk_ratelimit",
717115e1 675 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 676 .maxlen = sizeof(int),
677 .mode = 0644,
678 .proc_handler = &proc_dointvec_jiffies,
679 .strategy = &sysctl_jiffies,
680 },
681 {
682 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
683 .procname = "printk_ratelimit_burst",
717115e1 684 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = &proc_dointvec,
688 },
7ef3d2fd 689#endif
1da177e4
LT		 690 {
691 .ctl_name = KERN_NGROUPS_MAX,
692 .procname = "ngroups_max",
693 .data = &ngroups_max,
694 .maxlen = sizeof (int),
695 .mode = 0444,
696 .proc_handler = &proc_dointvec,
697 },
698#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
699 {
700 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
701 .procname = "unknown_nmi_panic",
702 .data = &unknown_nmi_panic,
703 .maxlen = sizeof (int),
704 .mode = 0644,
2fbe7b25 705 .proc_handler = &proc_dointvec,
1da177e4 706 },
407984f1 707 {
407984f1
DZ		 708 .procname = "nmi_watchdog",
709 .data = &nmi_watchdog_enabled,
710 .maxlen = sizeof (int),
711 .mode = 0644,
712 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 713 },
714#endif
715#if defined(CONFIG_X86)
8da5adda
DZ		 716 {
717 .ctl_name = KERN_PANIC_ON_NMI,
718 .procname = "panic_on_unrecovered_nmi",
719 .data = &panic_on_unrecovered_nmi,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = &proc_dointvec,
723 },
1da177e4
LT		 724 {
725 .ctl_name = KERN_BOOTLOADER_TYPE,
726 .procname = "bootloader_type",
727 .data = &bootloader_type,
728 .maxlen = sizeof (int),
729 .mode = 0444,
730 .proc_handler = &proc_dointvec,
731 },
5031296c
PA		 732 {
733 .ctl_name = CTL_UNNUMBERED,
734 .procname = "bootloader_version",
735 .data = &bootloader_version,
736 .maxlen = sizeof (int),
737 .mode = 0444,
738 .proc_handler = &proc_dointvec,
739 },
0741f4d2
CE		 740 {
741 .ctl_name = CTL_UNNUMBERED,
742 .procname = "kstack_depth_to_print",
743 .data = &kstack_depth_to_print,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = &proc_dointvec,
747 },
6e7c4025
IM		 748 {
749 .ctl_name = CTL_UNNUMBERED,
750 .procname = "io_delay_type",
751 .data = &io_delay_type,
752 .maxlen = sizeof(int),
753 .mode = 0644,
754 .proc_handler = &proc_dointvec,
755 },
1da177e4 756#endif
7a9166e3 757#if defined(CONFIG_MMU)
1da177e4
LT		 758 {
759 .ctl_name = KERN_RANDOMIZE,
760 .procname = "randomize_va_space",
761 .data = &randomize_va_space,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = &proc_dointvec,
765 },
7a9166e3 766#endif
0152fb37 767#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 768 {
769 .ctl_name = KERN_SPIN_RETRY,
770 .procname = "spin_retry",
771 .data = &spin_retry,
772 .maxlen = sizeof (int),
773 .mode = 0644,
774 .proc_handler = &proc_dointvec,
775 },
c255d844 776#endif
673d5b43 777#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 778 {
c255d844 779 .procname = "acpi_video_flags",
77afcf78 780 .data = &acpi_realmode_flags,
c255d844
PM		 781 .maxlen = sizeof (unsigned long),
782 .mode = 0644,
7f99f06f 783 .proc_handler = &proc_doulongvec_minmax,
c255d844 784 },
d2b176ed
JS		 785#endif
786#ifdef CONFIG_IA64
787 {
788 .ctl_name = KERN_IA64_UNALIGNED,
789 .procname = "ignore-unaligned-usertrap",
790 .data = &no_unaligned_warning,
791 .maxlen = sizeof (int),
792 .mode = 0644,
793 .proc_handler = &proc_dointvec,
794 },
88fc241f
DC		 795 {
796 .ctl_name = CTL_UNNUMBERED,
797 .procname = "unaligned-dump-stack",
798 .data = &unaligned_dump_stack,
799 .maxlen = sizeof (int),
800 .mode = 0644,
801 .proc_handler = &proc_dointvec,
802 },
bebfa101 803#endif
c4f3b63f 804#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 805 {
806 .ctl_name = CTL_UNNUMBERED,
807 .procname = "softlockup_panic",
808 .data = &softlockup_panic,
809 .maxlen = sizeof(int),
810 .mode = 0644,
4dca10a9 811 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 812 .strategy = &sysctl_intvec,
813 .extra1 = &zero,
814 .extra2 = &one,
815 },
c4f3b63f
RT		 816 {
817 .ctl_name = CTL_UNNUMBERED,
818 .procname = "softlockup_thresh",
819 .data = &softlockup_thresh,
9383d967 820 .maxlen = sizeof(int),
c4f3b63f 821 .mode = 0644,
baf48f65 822 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 823 .strategy = &sysctl_intvec,
9383d967 824 .extra1 = &neg_one,
c4f3b63f
RT		 825 .extra2 = &sixty,
826 },
e162b39a
MSB		 827#endif
828#ifdef CONFIG_DETECT_HUNG_TASK
829 {
830 .ctl_name = CTL_UNNUMBERED,
831 .procname = "hung_task_panic",
832 .data = &sysctl_hung_task_panic,
833 .maxlen = sizeof(int),
834 .mode = 0644,
835 .proc_handler = &proc_dointvec_minmax,
836 .strategy = &sysctl_intvec,
837 .extra1 = &zero,
838 .extra2 = &one,
839 },
82a1fcb9
IM		 840 {
841 .ctl_name = CTL_UNNUMBERED,
842 .procname = "hung_task_check_count",
843 .data = &sysctl_hung_task_check_count,
90739081 844 .maxlen = sizeof(unsigned long),
82a1fcb9 845 .mode = 0644,
90739081 846 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 847 .strategy = &sysctl_intvec,
848 },
849 {
850 .ctl_name = CTL_UNNUMBERED,
851 .procname = "hung_task_timeout_secs",
852 .data = &sysctl_hung_task_timeout_secs,
90739081 853 .maxlen = sizeof(unsigned long),
82a1fcb9 854 .mode = 0644,
e162b39a 855 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 856 .strategy = &sysctl_intvec,
857 },
858 {
859 .ctl_name = CTL_UNNUMBERED,
860 .procname = "hung_task_warnings",
861 .data = &sysctl_hung_task_warnings,
90739081 862 .maxlen = sizeof(unsigned long),
82a1fcb9 863 .mode = 0644,
90739081 864 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 865 .strategy = &sysctl_intvec,
866 },
c4f3b63f 867#endif
bebfa101
AK		 868#ifdef CONFIG_COMPAT
869 {
870 .ctl_name = KERN_COMPAT_LOG,
871 .procname = "compat-log",
872 .data = &compat_log,
873 .maxlen = sizeof (int),
874 .mode = 0644,
875 .proc_handler = &proc_dointvec,
876 },
951f22d5 877#endif
23f78d4a
IM		 878#ifdef CONFIG_RT_MUTEXES
879 {
880 .ctl_name = KERN_MAX_LOCK_DEPTH,
881 .procname = "max_lock_depth",
882 .data = &max_lock_depth,
883 .maxlen = sizeof(int),
884 .mode = 0644,
885 .proc_handler = &proc_dointvec,
886 },
5096add8 887#endif
10a0a8d4
JF		 888 {
889 .ctl_name = CTL_UNNUMBERED,
890 .procname = "poweroff_cmd",
891 .data = &poweroff_cmd,
892 .maxlen = POWEROFF_CMD_PATH_LEN,
893 .mode = 0644,
894 .proc_handler = &proc_dostring,
895 .strategy = &sysctl_string,
896 },
0b77f5bf
DH		 897#ifdef CONFIG_KEYS
898 {
899 .ctl_name = CTL_UNNUMBERED,
900 .procname = "keys",
901 .mode = 0555,
902 .child = key_sysctls,
903 },
904#endif
31a72bce
PM		 905#ifdef CONFIG_RCU_TORTURE_TEST
906 {
907 .ctl_name = CTL_UNNUMBERED,
908 .procname = "rcutorture_runnable",
909 .data = &rcutorture_runnable,
910 .maxlen = sizeof(int),
911 .mode = 0644,
912 .proc_handler = &proc_dointvec,
913 },
914#endif
12e22c5e
DH		 915#ifdef CONFIG_SLOW_WORK
916 {
917 .ctl_name = CTL_UNNUMBERED,
918 .procname = "slow-work",
919 .mode = 0555,
920 .child = slow_work_sysctls,
921 },
922#endif
ed2c12f3
AM		 923/*
924 * NOTE: do not add new entries to this table unless you have read
925 * Documentation/sysctl/ctl_unnumbered.txt
926 */
1da177e4
LT		 927 { .ctl_name = 0 }
928};
929
d8217f07 930static struct ctl_table vm_table[] = {
1da177e4
LT		 931 {
932 .ctl_name = VM_OVERCOMMIT_MEMORY,
933 .procname = "overcommit_memory",
934 .data = &sysctl_overcommit_memory,
935 .maxlen = sizeof(sysctl_overcommit_memory),
936 .mode = 0644,
937 .proc_handler = &proc_dointvec,
938 },
fadd8fbd
KH		 939 {
940 .ctl_name = VM_PANIC_ON_OOM,
941 .procname = "panic_on_oom",
942 .data = &sysctl_panic_on_oom,
943 .maxlen = sizeof(sysctl_panic_on_oom),
944 .mode = 0644,
945 .proc_handler = &proc_dointvec,
946 },
fe071d7e
DR		 947 {
948 .ctl_name = CTL_UNNUMBERED,
949 .procname = "oom_kill_allocating_task",
950 .data = &sysctl_oom_kill_allocating_task,
951 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
952 .mode = 0644,
953 .proc_handler = &proc_dointvec,
954 },
fef1bdd6
DR		 955 {
956 .ctl_name = CTL_UNNUMBERED,
957 .procname = "oom_dump_tasks",
958 .data = &sysctl_oom_dump_tasks,
959 .maxlen = sizeof(sysctl_oom_dump_tasks),
960 .mode = 0644,
961 .proc_handler = &proc_dointvec,
962 },
1da177e4
LT		 963 {
964 .ctl_name = VM_OVERCOMMIT_RATIO,
965 .procname = "overcommit_ratio",
966 .data = &sysctl_overcommit_ratio,
967 .maxlen = sizeof(sysctl_overcommit_ratio),
968 .mode = 0644,
969 .proc_handler = &proc_dointvec,
970 },
971 {
972 .ctl_name = VM_PAGE_CLUSTER,
973 .procname = "page-cluster",
974 .data = &page_cluster,
975 .maxlen = sizeof(int),
976 .mode = 0644,
977 .proc_handler = &proc_dointvec,
978 },
979 {
980 .ctl_name = VM_DIRTY_BACKGROUND,
981 .procname = "dirty_background_ratio",
982 .data = &dirty_background_ratio,
983 .maxlen = sizeof(dirty_background_ratio),
984 .mode = 0644,
2da02997 985 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 986 .strategy = &sysctl_intvec,
987 .extra1 = &zero,
988 .extra2 = &one_hundred,
989 },
2da02997
DR		 990 {
991 .ctl_name = CTL_UNNUMBERED,
992 .procname = "dirty_background_bytes",
993 .data = &dirty_background_bytes,
994 .maxlen = sizeof(dirty_background_bytes),
995 .mode = 0644,
996 .proc_handler = &dirty_background_bytes_handler,
997 .strategy = &sysctl_intvec,
fc3501d4 998 .extra1 = &one_ul,
2da02997 999 },
1da177e4
LT		 1000 {
1001 .ctl_name = VM_DIRTY_RATIO,
1002 .procname = "dirty_ratio",
1003 .data = &vm_dirty_ratio,
1004 .maxlen = sizeof(vm_dirty_ratio),
1005 .mode = 0644,
04fbfdc1 1006 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1007 .strategy = &sysctl_intvec,
1008 .extra1 = &zero,
1009 .extra2 = &one_hundred,
1010 },
2da02997
DR		 1011 {
1012 .ctl_name = CTL_UNNUMBERED,
1013 .procname = "dirty_bytes",
1014 .data = &vm_dirty_bytes,
1015 .maxlen = sizeof(vm_dirty_bytes),
1016 .mode = 0644,
1017 .proc_handler = &dirty_bytes_handler,
1018 .strategy = &sysctl_intvec,
9e4a5bda 1019 .extra1 = &dirty_bytes_min,
2da02997 1020 },
1da177e4 1021 {
1da177e4 1022 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1023 .data = &dirty_writeback_interval,
1024 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1025 .mode = 0644,
1026 .proc_handler = &dirty_writeback_centisecs_handler,
1027 },
1028 {
1da177e4 1029 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1030 .data = &dirty_expire_interval,
1031 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1032 .mode = 0644,
704503d8 1033 .proc_handler = &proc_dointvec,
1da177e4
LT		 1034 },
1035 {
1036 .ctl_name = VM_NR_PDFLUSH_THREADS,
1037 .procname = "nr_pdflush_threads",
1038 .data = &nr_pdflush_threads,
1039 .maxlen = sizeof nr_pdflush_threads,
1040 .mode = 0444 /* read-only*/,
1041 .proc_handler = &proc_dointvec,
1042 },
1043 {
1044 .ctl_name = VM_SWAPPINESS,
1045 .procname = "swappiness",
1046 .data = &vm_swappiness,
1047 .maxlen = sizeof(vm_swappiness),
1048 .mode = 0644,
1049 .proc_handler = &proc_dointvec_minmax,
1050 .strategy = &sysctl_intvec,
1051 .extra1 = &zero,
1052 .extra2 = &one_hundred,
1053 },
1054#ifdef CONFIG_HUGETLB_PAGE
1055 {
1da177e4 1056 .procname = "nr_hugepages",
e5ff2159 1057 .data = NULL,
1da177e4
LT		 1058 .maxlen = sizeof(unsigned long),
1059 .mode = 0644,
1060 .proc_handler = &hugetlb_sysctl_handler,
1061 .extra1 = (void *)&hugetlb_zero,
1062 .extra2 = (void *)&hugetlb_infinity,
1063 },
1064 {
1065 .ctl_name = VM_HUGETLB_GROUP,
1066 .procname = "hugetlb_shm_group",
1067 .data = &sysctl_hugetlb_shm_group,
1068 .maxlen = sizeof(gid_t),
1069 .mode = 0644,
1070 .proc_handler = &proc_dointvec,
1071 },
396faf03
MG		 1072 {
1073 .ctl_name = CTL_UNNUMBERED,
1074 .procname = "hugepages_treat_as_movable",
1075 .data = &hugepages_treat_as_movable,
1076 .maxlen = sizeof(int),
1077 .mode = 0644,
1078 .proc_handler = &hugetlb_treat_movable_handler,
1079 },
d1c3fb1f
NA		 1080 {
1081 .ctl_name = CTL_UNNUMBERED,
1082 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1083 .data = NULL,
1084 .maxlen = sizeof(unsigned long),
d1c3fb1f 1085 .mode = 0644,
a3d0c6aa 1086 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1087 .extra1 = (void *)&hugetlb_zero,
1088 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1089 },
1da177e4
LT		 1090#endif
1091 {
1092 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1093 .procname = "lowmem_reserve_ratio",
1094 .data = &sysctl_lowmem_reserve_ratio,
1095 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1096 .mode = 0644,
1097 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1098 .strategy = &sysctl_intvec,
1099 },
9d0243bc
AM		 1100 {
1101 .ctl_name = VM_DROP_PAGECACHE,
1102 .procname = "drop_caches",
1103 .data = &sysctl_drop_caches,
1104 .maxlen = sizeof(int),
1105 .mode = 0644,
1106 .proc_handler = drop_caches_sysctl_handler,
1107 .strategy = &sysctl_intvec,
1108 },
1da177e4
LT		 1109 {
1110 .ctl_name = VM_MIN_FREE_KBYTES,
1111 .procname = "min_free_kbytes",
1112 .data = &min_free_kbytes,
1113 .maxlen = sizeof(min_free_kbytes),
1114 .mode = 0644,
1115 .proc_handler = &min_free_kbytes_sysctl_handler,
1116 .strategy = &sysctl_intvec,
1117 .extra1 = &zero,
1118 },
8ad4b1fb
RS		 1119 {
1120 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1121 .procname = "percpu_pagelist_fraction",
1122 .data = &percpu_pagelist_fraction,
1123 .maxlen = sizeof(percpu_pagelist_fraction),
1124 .mode = 0644,
1125 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1126 .strategy = &sysctl_intvec,
1127 .extra1 = &min_percpu_pagelist_fract,
1128 },
1da177e4
LT		 1129#ifdef CONFIG_MMU
1130 {
1131 .ctl_name = VM_MAX_MAP_COUNT,
1132 .procname = "max_map_count",
1133 .data = &sysctl_max_map_count,
1134 .maxlen = sizeof(sysctl_max_map_count),
1135 .mode = 0644,
1136 .proc_handler = &proc_dointvec
1137 },
dd8632a1
PM		 1138#else
1139 {
1140 .ctl_name = CTL_UNNUMBERED,
1141 .procname = "nr_trim_pages",
1142 .data = &sysctl_nr_trim_pages,
1143 .maxlen = sizeof(sysctl_nr_trim_pages),
1144 .mode = 0644,
1145 .proc_handler = &proc_dointvec_minmax,
1146 .strategy = &sysctl_intvec,
1147 .extra1 = &zero,
1148 },
1da177e4
LT		 1149#endif
1150 {
1151 .ctl_name = VM_LAPTOP_MODE,
1152 .procname = "laptop_mode",
1153 .data = &laptop_mode,
1154 .maxlen = sizeof(laptop_mode),
1155 .mode = 0644,
ed5b43f1
BS		 1156 .proc_handler = &proc_dointvec_jiffies,
1157 .strategy = &sysctl_jiffies,
1da177e4
LT		 1158 },
1159 {
1160 .ctl_name = VM_BLOCK_DUMP,
1161 .procname = "block_dump",
1162 .data = &block_dump,
1163 .maxlen = sizeof(block_dump),
1164 .mode = 0644,
1165 .proc_handler = &proc_dointvec,
1166 .strategy = &sysctl_intvec,
1167 .extra1 = &zero,
1168 },
1169 {
1170 .ctl_name = VM_VFS_CACHE_PRESSURE,
1171 .procname = "vfs_cache_pressure",
1172 .data = &sysctl_vfs_cache_pressure,
1173 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1174 .mode = 0644,
1175 .proc_handler = &proc_dointvec,
1176 .strategy = &sysctl_intvec,
1177 .extra1 = &zero,
1178 },
1179#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1180 {
1181 .ctl_name = VM_LEGACY_VA_LAYOUT,
1182 .procname = "legacy_va_layout",
1183 .data = &sysctl_legacy_va_layout,
1184 .maxlen = sizeof(sysctl_legacy_va_layout),
1185 .mode = 0644,
1186 .proc_handler = &proc_dointvec,
1187 .strategy = &sysctl_intvec,
1188 .extra1 = &zero,
1189 },
1190#endif
1743660b
CL		 1191#ifdef CONFIG_NUMA
1192 {
1193 .ctl_name = VM_ZONE_RECLAIM_MODE,
1194 .procname = "zone_reclaim_mode",
1195 .data = &zone_reclaim_mode,
1196 .maxlen = sizeof(zone_reclaim_mode),
1197 .mode = 0644,
1198 .proc_handler = &proc_dointvec,
c84db23c
CL		 1199 .strategy = &sysctl_intvec,
1200 .extra1 = &zero,
1743660b 1201 },
9614634f
CL		 1202 {
1203 .ctl_name = VM_MIN_UNMAPPED,
1204 .procname = "min_unmapped_ratio",
1205 .data = &sysctl_min_unmapped_ratio,
1206 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1207 .mode = 0644,
1208 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1209 .strategy = &sysctl_intvec,
1210 .extra1 = &zero,
1211 .extra2 = &one_hundred,
1212 },
0ff38490
CL		 1213 {
1214 .ctl_name = VM_MIN_SLAB,
1215 .procname = "min_slab_ratio",
1216 .data = &sysctl_min_slab_ratio,
1217 .maxlen = sizeof(sysctl_min_slab_ratio),
1218 .mode = 0644,
1219 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1220 .strategy = &sysctl_intvec,
1221 .extra1 = &zero,
1222 .extra2 = &one_hundred,
1223 },
e6e5494c 1224#endif
77461ab3
CL		 1225#ifdef CONFIG_SMP
1226 {
1227 .ctl_name = CTL_UNNUMBERED,
1228 .procname = "stat_interval",
1229 .data = &sysctl_stat_interval,
1230 .maxlen = sizeof(sysctl_stat_interval),
1231 .mode = 0644,
1232 .proc_handler = &proc_dointvec_jiffies,
1233 .strategy = &sysctl_jiffies,
1234 },
1235#endif
ed032189
EP		 1236#ifdef CONFIG_SECURITY
1237 {
1238 .ctl_name = CTL_UNNUMBERED,
1239 .procname = "mmap_min_addr",
1240 .data = &mmap_min_addr,
1241 .maxlen = sizeof(unsigned long),
1242 .mode = 0644,
1243 .proc_handler = &proc_doulongvec_minmax,
1244 },
8daec965 1245#endif
f0c0b2b8
KH		 1246#ifdef CONFIG_NUMA
1247 {
1248 .ctl_name = CTL_UNNUMBERED,
1249 .procname = "numa_zonelist_order",
1250 .data = &numa_zonelist_order,
1251 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1252 .mode = 0644,
1253 .proc_handler = &numa_zonelist_order_handler,
1254 .strategy = &sysctl_string,
1255 },
1256#endif
2b8232ce 1257#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1258 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1259 {
1260 .ctl_name = VM_VDSO_ENABLED,
1261 .procname = "vdso_enabled",
1262 .data = &vdso_enabled,
1263 .maxlen = sizeof(vdso_enabled),
1264 .mode = 0644,
1265 .proc_handler = &proc_dointvec,
1266 .strategy = &sysctl_intvec,
1267 .extra1 = &zero,
1268 },
1da177e4 1269#endif
195cf453
BG		 1270#ifdef CONFIG_HIGHMEM
1271 {
1272 .ctl_name = CTL_UNNUMBERED,
1273 .procname = "highmem_is_dirtyable",
1274 .data = &vm_highmem_is_dirtyable,
1275 .maxlen = sizeof(vm_highmem_is_dirtyable),
1276 .mode = 0644,
1277 .proc_handler = &proc_dointvec_minmax,
1278 .strategy = &sysctl_intvec,
1279 .extra1 = &zero,
1280 .extra2 = &one,
1281 },
1282#endif
4be6f6bb
PZ		 1283#ifdef CONFIG_UNEVICTABLE_LRU
1284 {
1285 .ctl_name = CTL_UNNUMBERED,
1286 .procname = "scan_unevictable_pages",
1287 .data = &scan_unevictable_pages,
1288 .maxlen = sizeof(scan_unevictable_pages),
1289 .mode = 0644,
1290 .proc_handler = &scan_unevictable_handler,
1291 },
1292#endif
2be7fe07
AM		 1293/*
1294 * NOTE: do not add new entries to this table unless you have read
1295 * Documentation/sysctl/ctl_unnumbered.txt
1296 */
1da177e4
LT		 1297 { .ctl_name = 0 }
1298};
1299
2abc26fc 1300#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1301static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1302 { .ctl_name = 0 }
1303};
1304#endif
1305
d8217f07 1306static struct ctl_table fs_table[] = {
1da177e4
LT		 1307 {
1308 .ctl_name = FS_NRINODE,
1309 .procname = "inode-nr",
1310 .data = &inodes_stat,
1311 .maxlen = 2*sizeof(int),
1312 .mode = 0444,
1313 .proc_handler = &proc_dointvec,
1314 },
1315 {
1316 .ctl_name = FS_STATINODE,
1317 .procname = "inode-state",
1318 .data = &inodes_stat,
1319 .maxlen = 7*sizeof(int),
1320 .mode = 0444,
1321 .proc_handler = &proc_dointvec,
1322 },
1323 {
1da177e4
LT		 1324 .procname = "file-nr",
1325 .data = &files_stat,
1326 .maxlen = 3*sizeof(int),
1327 .mode = 0444,
529bf6be 1328 .proc_handler = &proc_nr_files,
1da177e4
LT		 1329 },
1330 {
1331 .ctl_name = FS_MAXFILE,
1332 .procname = "file-max",
1333 .data = &files_stat.max_files,
1334 .maxlen = sizeof(int),
1335 .mode = 0644,
1336 .proc_handler = &proc_dointvec,
1337 },
9cfe015a
ED		 1338 {
1339 .ctl_name = CTL_UNNUMBERED,
1340 .procname = "nr_open",
1341 .data = &sysctl_nr_open,
1342 .maxlen = sizeof(int),
1343 .mode = 0644,
eceea0b3
AV		 1344 .proc_handler = &proc_dointvec_minmax,
1345 .extra1 = &sysctl_nr_open_min,
1346 .extra2 = &sysctl_nr_open_max,
9cfe015a 1347 },
1da177e4
LT		 1348 {
1349 .ctl_name = FS_DENTRY,
1350 .procname = "dentry-state",
1351 .data = &dentry_stat,
1352 .maxlen = 6*sizeof(int),
1353 .mode = 0444,
1354 .proc_handler = &proc_dointvec,
1355 },
1356 {
1357 .ctl_name = FS_OVERFLOWUID,
1358 .procname = "overflowuid",
1359 .data = &fs_overflowuid,
1360 .maxlen = sizeof(int),
1361 .mode = 0644,
1362 .proc_handler = &proc_dointvec_minmax,
1363 .strategy = &sysctl_intvec,
1364 .extra1 = &minolduid,
1365 .extra2 = &maxolduid,
1366 },
1367 {
1368 .ctl_name = FS_OVERFLOWGID,
1369 .procname = "overflowgid",
1370 .data = &fs_overflowgid,
1371 .maxlen = sizeof(int),
1372 .mode = 0644,
1373 .proc_handler = &proc_dointvec_minmax,
1374 .strategy = &sysctl_intvec,
1375 .extra1 = &minolduid,
1376 .extra2 = &maxolduid,
1377 },
bfcd17a6 1378#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1379 {
1380 .ctl_name = FS_LEASES,
1381 .procname = "leases-enable",
1382 .data = &leases_enable,
1383 .maxlen = sizeof(int),
1384 .mode = 0644,
1385 .proc_handler = &proc_dointvec,
1386 },
bfcd17a6 1387#endif
1da177e4
LT		 1388#ifdef CONFIG_DNOTIFY
1389 {
1390 .ctl_name = FS_DIR_NOTIFY,
1391 .procname = "dir-notify-enable",
1392 .data = &dir_notify_enable,
1393 .maxlen = sizeof(int),
1394 .mode = 0644,
1395 .proc_handler = &proc_dointvec,
1396 },
1397#endif
1398#ifdef CONFIG_MMU
bfcd17a6 1399#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1400 {
1401 .ctl_name = FS_LEASE_TIME,
1402 .procname = "lease-break-time",
1403 .data = &lease_break_time,
1404 .maxlen = sizeof(int),
1405 .mode = 0644,
8e654fba 1406 .proc_handler = &proc_dointvec,
1da177e4 1407 },
bfcd17a6 1408#endif
ebf3f09c 1409#ifdef CONFIG_AIO
1da177e4 1410 {
1da177e4
LT		 1411 .procname = "aio-nr",
1412 .data = &aio_nr,
1413 .maxlen = sizeof(aio_nr),
1414 .mode = 0444,
d55b5fda 1415 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1416 },
1417 {
1da177e4
LT		 1418 .procname = "aio-max-nr",
1419 .data = &aio_max_nr,
1420 .maxlen = sizeof(aio_max_nr),
1421 .mode = 0644,
d55b5fda 1422 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1423 },
ebf3f09c 1424#endif /* CONFIG_AIO */
2d9048e2 1425#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1426 {
1427 .ctl_name = FS_INOTIFY,
1428 .procname = "inotify",
1429 .mode = 0555,
1430 .child = inotify_table,
1431 },
1432#endif
7ef9964e
DL		 1433#ifdef CONFIG_EPOLL
1434 {
1435 .procname = "epoll",
1436 .mode = 0555,
1437 .child = epoll_table,
1438 },
1439#endif
1da177e4 1440#endif
d6e71144
AC		 1441 {
1442 .ctl_name = KERN_SETUID_DUMPABLE,
1443 .procname = "suid_dumpable",
1444 .data = &suid_dumpable,
1445 .maxlen = sizeof(int),
1446 .mode = 0644,
8e654fba
MW		 1447 .proc_handler = &proc_dointvec_minmax,
1448 .strategy = &sysctl_intvec,
1449 .extra1 = &zero,
1450 .extra2 = &two,
d6e71144 1451 },
2abc26fc
EB		 1452#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1453 {
1454 .ctl_name = CTL_UNNUMBERED,
1455 .procname = "binfmt_misc",
1456 .mode = 0555,
1457 .child = binfmt_misc_table,
1458 },
1459#endif
2be7fe07
AM		 1460/*
1461 * NOTE: do not add new entries to this table unless you have read
1462 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1463 */
1da177e4
LT		 1464 { .ctl_name = 0 }
1465};
1466
d8217f07 1467static struct ctl_table debug_table[] = {
d0c3d534 1468#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1469 {
1470 .ctl_name = CTL_UNNUMBERED,
1471 .procname = "exception-trace",
1472 .data = &show_unhandled_signals,
1473 .maxlen = sizeof(int),
1474 .mode = 0644,
1475 .proc_handler = proc_dointvec
1476 },
1477#endif
1da177e4
LT		 1478 { .ctl_name = 0 }
1479};
1480
d8217f07 1481static struct ctl_table dev_table[] = {
1da177e4 1482 { .ctl_name = 0 }
0eeca283 1483};
1da177e4 1484
330d57fb
AV		 1485static DEFINE_SPINLOCK(sysctl_lock);
1486
1487/* called under sysctl_lock */
1488static int use_table(struct ctl_table_header *p)
1489{
1490 if (unlikely(p->unregistering))
1491 return 0;
1492 p->used++;
1493 return 1;
1494}
1495
1496/* called under sysctl_lock */
1497static void unuse_table(struct ctl_table_header *p)
1498{
1499 if (!--p->used)
1500 if (unlikely(p->unregistering))
1501 complete(p->unregistering);
1502}
1503
1504/* called under sysctl_lock, will reacquire if has to wait */
1505static void start_unregistering(struct ctl_table_header *p)
1506{
1507 /*
1508 * if p->used is 0, nobody will ever touch that entry again;
1509 * we'll eliminate all paths to it before dropping sysctl_lock
1510 */
1511 if (unlikely(p->used)) {
1512 struct completion wait;
1513 init_completion(&wait);
1514 p->unregistering = &wait;
1515 spin_unlock(&sysctl_lock);
1516 wait_for_completion(&wait);
1517 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1518 } else {
1519 /* anything non-NULL; we'll never dereference it */
1520 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1521 }
1522 /*
1523 * do not remove from the list until nobody holds it; walking the
1524 * list in do_sysctl() relies on that.
1525 */
1526 list_del_init(&p->ctl_entry);
1527}
1528
f7e6ced4
AV		 1529void sysctl_head_get(struct ctl_table_header *head)
1530{
1531 spin_lock(&sysctl_lock);
1532 head->count++;
1533 spin_unlock(&sysctl_lock);
1534}
1535
1536void sysctl_head_put(struct ctl_table_header *head)
1537{
1538 spin_lock(&sysctl_lock);
1539 if (!--head->count)
1540 kfree(head);
1541 spin_unlock(&sysctl_lock);
1542}
1543
1544struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1545{
1546 if (!head)
1547 BUG();
1548 spin_lock(&sysctl_lock);
1549 if (!use_table(head))
1550 head = ERR_PTR(-ENOENT);
1551 spin_unlock(&sysctl_lock);
1552 return head;
1553}
1554
805b5d5e
EB		 1555void sysctl_head_finish(struct ctl_table_header *head)
1556{
1557 if (!head)
1558 return;
1559 spin_lock(&sysctl_lock);
1560 unuse_table(head);
1561 spin_unlock(&sysctl_lock);
1562}
1563
73455092
AV		 1564static struct ctl_table_set *
1565lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1566{
1567 struct ctl_table_set *set = &root->default_set;
1568 if (root->lookup)
1569 set = root->lookup(root, namespaces);
1570 return set;
1571}
1572
e51b6ba0
EB		 1573static struct list_head *
1574lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1575{
73455092
AV		 1576 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1577 return &set->list;
e51b6ba0
EB		 1578}
1579
1580struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1581 struct ctl_table_header *prev)
1582{
1583 struct ctl_table_root *root;
1584 struct list_head *header_list;
805b5d5e
EB		 1585 struct ctl_table_header *head;
1586 struct list_head *tmp;
e51b6ba0 1587
805b5d5e
EB		 1588 spin_lock(&sysctl_lock);
1589 if (prev) {
e51b6ba0 1590 head = prev;
805b5d5e
EB		 1591 tmp = &prev->ctl_entry;
1592 unuse_table(prev);
1593 goto next;
1594 }
1595 tmp = &root_table_header.ctl_entry;
1596 for (;;) {
1597 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1598
1599 if (!use_table(head))
1600 goto next;
1601 spin_unlock(&sysctl_lock);
1602 return head;
1603 next:
e51b6ba0 1604 root = head->root;
805b5d5e 1605 tmp = tmp->next;
e51b6ba0
EB		 1606 header_list = lookup_header_list(root, namespaces);
1607 if (tmp != header_list)
1608 continue;
1609
1610 do {
1611 root = list_entry(root->root_list.next,
1612 struct ctl_table_root, root_list);
1613 if (root == &sysctl_table_root)
1614 goto out;
1615 header_list = lookup_header_list(root, namespaces);
1616 } while (list_empty(header_list));
1617 tmp = header_list->next;
805b5d5e 1618 }
e51b6ba0 1619out:
805b5d5e
EB		 1620 spin_unlock(&sysctl_lock);
1621 return NULL;
1622}
1623
e51b6ba0
EB		 1624struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1625{
1626 return __sysctl_head_next(current->nsproxy, prev);
1627}
1628
1629void register_sysctl_root(struct ctl_table_root *root)
1630{
1631 spin_lock(&sysctl_lock);
1632 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1633 spin_unlock(&sysctl_lock);
1634}
1635
b89a8171 1636#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1637/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1638static int do_sysctl_strategy(struct ctl_table_root *root,
1639 struct ctl_table *table,
2c4c7155
PE		 1640 void __user *oldval, size_t __user *oldlenp,
1641 void __user *newval, size_t newlen)
1642{
1643 int op = 0, rc;
1644
1645 if (oldval)
e6305c43 1646 op |= MAY_READ;
2c4c7155 1647 if (newval)
e6305c43 1648 op |= MAY_WRITE;
d7321cd6 1649 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1650 return -EPERM;
1651
1652 if (table->strategy) {
f221e726 1653 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1654 if (rc < 0)
1655 return rc;
1656 if (rc > 0)
1657 return 0;
1658 }
1659
1660 /* If there is no strategy routine, or if the strategy returns
1661 * zero, proceed with automatic r/w */
1662 if (table->data && table->maxlen) {
f221e726 1663 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1664 if (rc < 0)
1665 return rc;
1666 }
1667 return 0;
1668}
1669
1670static int parse_table(int __user *name, int nlen,
1671 void __user *oldval, size_t __user *oldlenp,
1672 void __user *newval, size_t newlen,
d7321cd6 1673 struct ctl_table_root *root,
2c4c7155
PE		 1674 struct ctl_table *table)
1675{
1676 int n;
1677repeat:
1678 if (!nlen)
1679 return -ENOTDIR;
1680 if (get_user(n, name))
1681 return -EFAULT;
1682 for ( ; table->ctl_name || table->procname; table++) {
1683 if (!table->ctl_name)
1684 continue;
1685 if (n == table->ctl_name) {
1686 int error;
1687 if (table->child) {
e6305c43 1688 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1689 return -EPERM;
1690 name++;
1691 nlen--;
1692 table = table->child;
1693 goto repeat;
1694 }
f221e726 1695 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1696 oldval, oldlenp,
1697 newval, newlen);
1698 return error;
1699 }
1700 }
1701 return -ENOTDIR;
1702}
1703
1da177e4
LT		 1704int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1705 void __user *newval, size_t newlen)
1706{
805b5d5e 1707 struct ctl_table_header *head;
330d57fb 1708 int error = -ENOTDIR;
1da177e4
LT		 1709
1710 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1711 return -ENOTDIR;
1712 if (oldval) {
1713 int old_len;
1714 if (!oldlenp || get_user(old_len, oldlenp))
1715 return -EFAULT;
1716 }
330d57fb 1717
805b5d5e
EB		 1718 for (head = sysctl_head_next(NULL); head;
1719 head = sysctl_head_next(head)) {
330d57fb 1720 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1721 newval, newlen,
1722 head->root, head->ctl_table);
805b5d5e
EB		 1723 if (error != -ENOTDIR) {
1724 sysctl_head_finish(head);
330d57fb 1725 break;
805b5d5e
EB		 1726 }
1727 }
330d57fb 1728 return error;
1da177e4
LT		 1729}
1730
1e7bfb21 1731SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1732{
1733 struct __sysctl_args tmp;
1734 int error;
1735
1736 if (copy_from_user(&tmp, args, sizeof(tmp)))
1737 return -EFAULT;
1738
7058cb02
EB		 1739 error = deprecated_sysctl_warning(&tmp);
1740 if (error)
1741 goto out;
1742
1da177e4
LT		 1743 lock_kernel();
1744 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1745 tmp.newval, tmp.newlen);
1746 unlock_kernel();
7058cb02 1747out:
1da177e4
LT		 1748 return error;
1749}
b89a8171 1750#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1751
1752/*
1ff007eb 1753 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1754 * some sysctl variables are readonly even to root.
1755 */
1756
1757static int test_perm(int mode, int op)
1758{
76aac0e9 1759 if (!current_euid())
1da177e4
LT		 1760 mode >>= 6;
1761 else if (in_egroup_p(0))
1762 mode >>= 3;
e6305c43 1763 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1764 return 0;
1765 return -EACCES;
1766}
1767
d7321cd6 1768int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1769{
1770 int error;
d7321cd6
PE		 1771 int mode;
1772
e6305c43 1773 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1774 if (error)
1775 return error;
d7321cd6
PE		 1776
1777 if (root->permissions)
1778 mode = root->permissions(root, current->nsproxy, table);
1779 else
1780 mode = table->mode;
1781
1782 return test_perm(mode, op);
1da177e4
LT		 1783}
1784
d912b0cc
EB		 1785static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1786{
1787 for (; table->ctl_name || table->procname; table++) {
1788 table->parent = parent;
1789 if (table->child)
1790 sysctl_set_parent(table, table->child);
1791 }
1792}
1793
1794static __init int sysctl_init(void)
1795{
1796 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1797#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1798 {
1799 int err;
1800 err = sysctl_check_table(current->nsproxy, root_table);
1801 }
1802#endif
d912b0cc
EB		 1803 return 0;
1804}
1805
1806core_initcall(sysctl_init);
1807
bfbcf034
AV		 1808static struct ctl_table *is_branch_in(struct ctl_table *branch,
1809 struct ctl_table *table)
ae7edecc
AV		 1810{
1811 struct ctl_table *p;
1812 const char *s = branch->procname;
1813
1814 /* branch should have named subdirectory as its first element */
1815 if (!s || !branch->child)
bfbcf034 1816 return NULL;
ae7edecc
AV		 1817
1818 /* ... and nothing else */
1819 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1820 return NULL;
ae7edecc
AV		 1821
1822 /* table should contain subdirectory with the same name */
1823 for (p = table; p->procname || p->ctl_name; p++) {
1824 if (!p->child)
1825 continue;
1826 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1827 return p;
ae7edecc 1828 }
bfbcf034 1829 return NULL;
ae7edecc
AV		 1830}
1831
1832/* see if attaching q to p would be an improvement */
1833static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1834{
1835 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1836 struct ctl_table *next;
ae7edecc
AV		 1837 int is_better = 0;
1838 int not_in_parent = !p->attached_by;
1839
bfbcf034 1840 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1841 if (by == q->attached_by)
1842 is_better = 1;
1843 if (to == p->attached_by)
1844 not_in_parent = 1;
1845 by = by->child;
bfbcf034 1846 to = next->child;
ae7edecc
AV		 1847 }
1848
1849 if (is_better && not_in_parent) {
1850 q->attached_by = by;
1851 q->attached_to = to;
1852 q->parent = p;
1853 }
1854}
1855
1da177e4 1856/**
e51b6ba0
EB		 1857 * __register_sysctl_paths - register a sysctl hierarchy
1858 * @root: List of sysctl headers to register on
1859 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1860 * @path: The path to the directory the sysctl table is in.
1da177e4 1861 * @table: the top-level table structure
1da177e4
LT		 1862 *
1863 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1864 * array. A completely 0 filled entry terminates the table.
1da177e4 1865 *
d8217f07 1866 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1867 *
1868 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1869 * must be unique within that level of sysctl
1870 *
1871 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1872 * enter a sysctl file
1873 *
1874 * data - a pointer to data for use by proc_handler
1875 *
1876 * maxlen - the maximum size in bytes of the data
1877 *
1878 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1879 *
1880 * child - a pointer to the child sysctl table if this entry is a directory, or
1881 * %NULL.
1882 *
1883 * proc_handler - the text handler routine (described below)
1884 *
1885 * strategy - the strategy routine (described below)
1886 *
1887 * de - for internal use by the sysctl routines
1888 *
1889 * extra1, extra2 - extra pointers usable by the proc handler routines
1890 *
1891 * Leaf nodes in the sysctl tree will be represented by a single file
1892 * under /proc; non-leaf nodes will be represented by directories.
1893 *
1894 * sysctl(2) can automatically manage read and write requests through
1895 * the sysctl table. The data and maxlen fields of the ctl_table
1896 * struct enable minimal validation of the values being written to be
1897 * performed, and the mode field allows minimal authentication.
1898 *
1899 * More sophisticated management can be enabled by the provision of a
1900 * strategy routine with the table entry. This will be called before
1901 * any automatic read or write of the data is performed.
1902 *
1903 * The strategy routine may return
1904 *
1905 * < 0 - Error occurred (error is passed to user process)
1906 *
1907 * 0 - OK - proceed with automatic read or write.
1908 *
1909 * > 0 - OK - read or write has been done by the strategy routine, so
1910 * return immediately.
1911 *
1912 * There must be a proc_handler routine for any terminal nodes
1913 * mirrored under /proc/sys (non-terminals are handled by a built-in
1914 * directory handler). Several default handlers are available to
1915 * cover common cases -
1916 *
1917 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1918 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1919 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1920 *
1921 * It is the handler's job to read the input buffer from user memory
1922 * and process it. The handler should return 0 on success.
1923 *
1924 * This routine returns %NULL on a failure to register, and a pointer
1925 * to the table header on success.
1926 */
e51b6ba0
EB		 1927struct ctl_table_header *__register_sysctl_paths(
1928 struct ctl_table_root *root,
1929 struct nsproxy *namespaces,
1930 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1931{
29e796fd
EB		 1932 struct ctl_table_header *header;
1933 struct ctl_table *new, **prevp;
1934 unsigned int n, npath;
ae7edecc 1935 struct ctl_table_set *set;
29e796fd
EB		 1936
1937 /* Count the path components */
1938 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1939 ;
1940
1941 /*
1942 * For each path component, allocate a 2-element ctl_table array.
1943 * The first array element will be filled with the sysctl entry
1944 * for this, the second will be the sentinel (ctl_name == 0).
1945 *
1946 * We allocate everything in one go so that we don't have to
1947 * worry about freeing additional memory in unregister_sysctl_table.
1948 */
1949 header = kzalloc(sizeof(struct ctl_table_header) +
1950 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1951 if (!header)
1da177e4 1952 return NULL;
29e796fd
EB		 1953
1954 new = (struct ctl_table *) (header + 1);
1955
1956 /* Now connect the dots */
1957 prevp = &header->ctl_table;
1958 for (n = 0; n < npath; ++n, ++path) {
1959 /* Copy the procname */
1960 new->procname = path->procname;
1961 new->ctl_name = path->ctl_name;
1962 new->mode = 0555;
1963
1964 *prevp = new;
1965 prevp = &new->child;
1966
1967 new += 2;
1968 }
1969 *prevp = table;
23eb06de 1970 header->ctl_table_arg = table;
29e796fd
EB		 1971
1972 INIT_LIST_HEAD(&header->ctl_entry);
1973 header->used = 0;
1974 header->unregistering = NULL;
e51b6ba0 1975 header->root = root;
29e796fd 1976 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1977 header->count = 1;
88f458e4 1978#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1979 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1980 kfree(header);
fc6cd25b
EB		 1981 return NULL;
1982 }
88f458e4 1983#endif
330d57fb 1984 spin_lock(&sysctl_lock);
73455092 1985 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 1986 header->attached_by = header->ctl_table;
1987 header->attached_to = root_table;
1988 header->parent = &root_table_header;
1989 for (set = header->set; set; set = set->parent) {
1990 struct ctl_table_header *p;
1991 list_for_each_entry(p, &set->list, ctl_entry) {
1992 if (p->unregistering)
1993 continue;
1994 try_attach(p, header);
1995 }
1996 }
1997 header->parent->count++;
73455092 1998 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 1999 spin_unlock(&sysctl_lock);
29e796fd
EB		 2000
2001 return header;
2002}
2003
e51b6ba0
EB		 2004/**
2005 * register_sysctl_table_path - register a sysctl table hierarchy
2006 * @path: The path to the directory the sysctl table is in.
2007 * @table: the top-level table structure
2008 *
2009 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2010 * array. A completely 0 filled entry terminates the table.
2011 *
2012 * See __register_sysctl_paths for more details.
2013 */
2014struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2015 struct ctl_table *table)
2016{
2017 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2018 path, table);
2019}
2020
29e796fd
EB		 2021/**
2022 * register_sysctl_table - register a sysctl table hierarchy
2023 * @table: the top-level table structure
2024 *
2025 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2026 * array. A completely 0 filled entry terminates the table.
2027 *
2028 * See register_sysctl_paths for more details.
2029 */
2030struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2031{
2032 static const struct ctl_path null_path[] = { {} };
2033
2034 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2035}
2036
2037/**
2038 * unregister_sysctl_table - unregister a sysctl table hierarchy
2039 * @header: the header returned from register_sysctl_table
2040 *
2041 * Unregisters the sysctl table and all children. proc entries may not
2042 * actually be removed until they are no longer used by anyone.
2043 */
2044void unregister_sysctl_table(struct ctl_table_header * header)
2045{
330d57fb 2046 might_sleep();
f1dad166
PE		 2047
2048 if (header == NULL)
2049 return;
2050
330d57fb
AV		 2051 spin_lock(&sysctl_lock);
2052 start_unregistering(header);
ae7edecc
AV		 2053 if (!--header->parent->count) {
2054 WARN_ON(1);
2055 kfree(header->parent);
2056 }
f7e6ced4
AV		 2057 if (!--header->count)
2058 kfree(header);
330d57fb 2059 spin_unlock(&sysctl_lock);
1da177e4
LT		 2060}
2061
9043476f
AV		 2062int sysctl_is_seen(struct ctl_table_header *p)
2063{
2064 struct ctl_table_set *set = p->set;
2065 int res;
2066 spin_lock(&sysctl_lock);
2067 if (p->unregistering)
2068 res = 0;
2069 else if (!set->is_seen)
2070 res = 1;
2071 else
2072 res = set->is_seen(set);
2073 spin_unlock(&sysctl_lock);
2074 return res;
2075}
2076
73455092
AV		 2077void setup_sysctl_set(struct ctl_table_set *p,
2078 struct ctl_table_set *parent,
2079 int (*is_seen)(struct ctl_table_set *))
2080{
2081 INIT_LIST_HEAD(&p->list);
2082 p->parent = parent ? parent : &sysctl_table_root.default_set;
2083 p->is_seen = is_seen;
2084}
2085
b89a8171 2086#else /* !CONFIG_SYSCTL */
d8217f07 2087struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2088{
2089 return NULL;
2090}
2091
29e796fd
EB		 2092struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2093 struct ctl_table *table)
2094{
2095 return NULL;
2096}
2097
b89a8171
EB		 2098void unregister_sysctl_table(struct ctl_table_header * table)
2099{
2100}
2101
73455092
AV		 2102void setup_sysctl_set(struct ctl_table_set *p,
2103 struct ctl_table_set *parent,
2104 int (*is_seen)(struct ctl_table_set *))
2105{
2106}
2107
f7e6ced4
AV		 2108void sysctl_head_put(struct ctl_table_header *head)
2109{
2110}
2111
b89a8171
EB		 2112#endif /* CONFIG_SYSCTL */
2113
1da177e4
LT		 2114/*
2115 * /proc/sys support
2116 */
2117
b89a8171 2118#ifdef CONFIG_PROC_SYSCTL
1da177e4 2119
b1ba4ddd
AB		 2120static int _proc_do_string(void* data, int maxlen, int write,
2121 struct file *filp, void __user *buffer,
2122 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2123{
2124 size_t len;
2125 char __user *p;
2126 char c;
8d060877
ON		 2127
2128 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2129 *lenp = 0;
2130 return 0;
2131 }
8d060877 2132
1da177e4
LT		 2133 if (write) {
2134 len = 0;
2135 p = buffer;
2136 while (len < *lenp) {
2137 if (get_user(c, p++))
2138 return -EFAULT;
2139 if (c == 0 || c == '\n')
2140 break;
2141 len++;
2142 }
f5dd3d6f
SV		 2143 if (len >= maxlen)
2144 len = maxlen-1;
2145 if(copy_from_user(data, buffer, len))
1da177e4 2146 return -EFAULT;
f5dd3d6f 2147 ((char *) data)[len] = 0;
1da177e4
LT		 2148 *ppos += *lenp;
2149 } else {
f5dd3d6f
SV		 2150 len = strlen(data);
2151 if (len > maxlen)
2152 len = maxlen;
8d060877
ON		 2153
2154 if (*ppos > len) {
2155 *lenp = 0;
2156 return 0;
2157 }
2158
2159 data += *ppos;
2160 len -= *ppos;
2161
1da177e4
LT		 2162 if (len > *lenp)
2163 len = *lenp;
2164 if (len)
f5dd3d6f 2165 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2166 return -EFAULT;
2167 if (len < *lenp) {
2168 if(put_user('\n', ((char __user *) buffer) + len))
2169 return -EFAULT;
2170 len++;
2171 }
2172 *lenp = len;
2173 *ppos += len;
2174 }
2175 return 0;
2176}
2177
f5dd3d6f
SV		 2178/**
2179 * proc_dostring - read a string sysctl
2180 * @table: the sysctl table
2181 * @write: %TRUE if this is a write to the sysctl file
2182 * @filp: the file structure
2183 * @buffer: the user buffer
2184 * @lenp: the size of the user buffer
2185 * @ppos: file position
2186 *
2187 * Reads/writes a string from/to the user buffer. If the kernel
2188 * buffer provided is not large enough to hold the string, the
2189 * string is truncated. The copied string is %NULL-terminated.
2190 * If the string is being read by the user process, it is copied
2191 * and a newline '\n' is added. It is truncated if the buffer is
2192 * not large enough.
2193 *
2194 * Returns 0 on success.
2195 */
d8217f07 2196int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2197 void __user *buffer, size_t *lenp, loff_t *ppos)
2198{
2199 return _proc_do_string(table->data, table->maxlen, write, filp,
2200 buffer, lenp, ppos);
2201}
2202
1da177e4
LT		 2203
2204static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2205 int *valp,
2206 int write, void *data)
2207{
2208 if (write) {
2209 *valp = *negp ? -*lvalp : *lvalp;
2210 } else {
2211 int val = *valp;
2212 if (val < 0) {
2213 *negp = -1;
2214 *lvalp = (unsigned long)-val;
2215 } else {
2216 *negp = 0;
2217 *lvalp = (unsigned long)val;
2218 }
2219 }
2220 return 0;
2221}
2222
d8217f07 2223static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2224 int write, struct file *filp, void __user *buffer,
2225 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2226 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2227 int write, void *data),
2228 void *data)
2229{
2230#define TMPBUFLEN 21
2231 int *i, vleft, first=1, neg, val;
2232 unsigned long lval;
2233 size_t left, len;
2234
2235 char buf[TMPBUFLEN], *p;
2236 char __user *s = buffer;
2237
fcfbd547 2238 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2239 (*ppos && !write)) {
2240 *lenp = 0;
2241 return 0;
2242 }
2243
fcfbd547 2244 i = (int *) tbl_data;
1da177e4
LT		 2245 vleft = table->maxlen / sizeof(*i);
2246 left = *lenp;
2247
2248 if (!conv)
2249 conv = do_proc_dointvec_conv;
2250
2251 for (; left && vleft--; i++, first=0) {
2252 if (write) {
2253 while (left) {
2254 char c;
2255 if (get_user(c, s))
2256 return -EFAULT;
2257 if (!isspace(c))
2258 break;
2259 left--;
2260 s++;
2261 }
2262 if (!left)
2263 break;
2264 neg = 0;
2265 len = left;
2266 if (len > sizeof(buf) - 1)
2267 len = sizeof(buf) - 1;
2268 if (copy_from_user(buf, s, len))
2269 return -EFAULT;
2270 buf[len] = 0;
2271 p = buf;
2272 if (*p == '-' && left > 1) {
2273 neg = 1;
bd9b0bac 2274 p++;
1da177e4
LT		 2275 }
2276 if (*p < '0' || *p > '9')
2277 break;
2278
2279 lval = simple_strtoul(p, &p, 0);
2280
2281 len = p-buf;
2282 if ((len < left) && *p && !isspace(*p))
2283 break;
2284 if (neg)
2285 val = -val;
2286 s += len;
2287 left -= len;
2288
2289 if (conv(&neg, &lval, i, 1, data))
2290 break;
2291 } else {
2292 p = buf;
2293 if (!first)
2294 *p++ = '\t';
2295
2296 if (conv(&neg, &lval, i, 0, data))
2297 break;
2298
2299 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2300 len = strlen(buf);
2301 if (len > left)
2302 len = left;
2303 if(copy_to_user(s, buf, len))
2304 return -EFAULT;
2305 left -= len;
2306 s += len;
2307 }
2308 }
2309
2310 if (!write && !first && left) {
2311 if(put_user('\n', s))
2312 return -EFAULT;
2313 left--, s++;
2314 }
2315 if (write) {
2316 while (left) {
2317 char c;
2318 if (get_user(c, s++))
2319 return -EFAULT;
2320 if (!isspace(c))
2321 break;
2322 left--;
2323 }
2324 }
2325 if (write && first)
2326 return -EINVAL;
2327 *lenp -= left;
2328 *ppos += *lenp;
2329 return 0;
2330#undef TMPBUFLEN
2331}
2332
d8217f07 2333static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2334 void __user *buffer, size_t *lenp, loff_t *ppos,
2335 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2336 int write, void *data),
2337 void *data)
2338{
2339 return __do_proc_dointvec(table->data, table, write, filp,
2340 buffer, lenp, ppos, conv, data);
2341}
2342
1da177e4
LT		 2343/**
2344 * proc_dointvec - read a vector of integers
2345 * @table: the sysctl table
2346 * @write: %TRUE if this is a write to the sysctl file
2347 * @filp: the file structure
2348 * @buffer: the user buffer
2349 * @lenp: the size of the user buffer
2350 * @ppos: file position
2351 *
2352 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2353 * values from/to the user buffer, treated as an ASCII string.
2354 *
2355 * Returns 0 on success.
2356 */
d8217f07 2357int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2358 void __user *buffer, size_t *lenp, loff_t *ppos)
2359{
2360 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2361 NULL,NULL);
2362}
2363
34f5a398 2364/*
25ddbb18
AK		 2365 * Taint values can only be increased
2366 * This means we can safely use a temporary.
34f5a398 2367 */
25ddbb18 2368static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2369 void __user *buffer, size_t *lenp, loff_t *ppos)
2370{
25ddbb18
AK		 2371 struct ctl_table t;
2372 unsigned long tmptaint = get_taint();
2373 int err;
34f5a398 2374
91fcd412 2375 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2376 return -EPERM;
2377
25ddbb18
AK		 2378 t = *table;
2379 t.data = &tmptaint;
2380 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2381 if (err < 0)
2382 return err;
2383
2384 if (write) {
2385 /*
2386 * Poor man's atomic or. Not worth adding a primitive
2387 * to everyone's atomic.h for this
2388 */
2389 int i;
2390 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2391 if ((tmptaint >> i) & 1)
2392 add_taint(i);
2393 }
2394 }
2395
2396 return err;
34f5a398
TT		 2397}
2398
1da177e4
LT		 2399struct do_proc_dointvec_minmax_conv_param {
2400 int *min;
2401 int *max;
2402};
2403
2404static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2405 int *valp,
2406 int write, void *data)
2407{
2408 struct do_proc_dointvec_minmax_conv_param *param = data;
2409 if (write) {
2410 int val = *negp ? -*lvalp : *lvalp;
2411 if ((param->min && *param->min > val) ||
2412 (param->max && *param->max < val))
2413 return -EINVAL;
2414 *valp = val;
2415 } else {
2416 int val = *valp;
2417 if (val < 0) {
2418 *negp = -1;
2419 *lvalp = (unsigned long)-val;
2420 } else {
2421 *negp = 0;
2422 *lvalp = (unsigned long)val;
2423 }
2424 }
2425 return 0;
2426}
2427
2428/**
2429 * proc_dointvec_minmax - read a vector of integers with min/max values
2430 * @table: the sysctl table
2431 * @write: %TRUE if this is a write to the sysctl file
2432 * @filp: the file structure
2433 * @buffer: the user buffer
2434 * @lenp: the size of the user buffer
2435 * @ppos: file position
2436 *
2437 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2438 * values from/to the user buffer, treated as an ASCII string.
2439 *
2440 * This routine will ensure the values are within the range specified by
2441 * table->extra1 (min) and table->extra2 (max).
2442 *
2443 * Returns 0 on success.
2444 */
d8217f07 2445int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2446 void __user *buffer, size_t *lenp, loff_t *ppos)
2447{
2448 struct do_proc_dointvec_minmax_conv_param param = {
2449 .min = (int *) table->extra1,
2450 .max = (int *) table->extra2,
2451 };
2452 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2453 do_proc_dointvec_minmax_conv, &param);
2454}
2455
d8217f07 2456static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2457 struct file *filp,
2458 void __user *buffer,
2459 size_t *lenp, loff_t *ppos,
2460 unsigned long convmul,
2461 unsigned long convdiv)
2462{
2463#define TMPBUFLEN 21
2464 unsigned long *i, *min, *max, val;
2465 int vleft, first=1, neg;
2466 size_t len, left;
2467 char buf[TMPBUFLEN], *p;
2468 char __user *s = buffer;
2469
fcfbd547 2470 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2471 (*ppos && !write)) {
2472 *lenp = 0;
2473 return 0;
2474 }
2475
fcfbd547 2476 i = (unsigned long *) data;
1da177e4
LT		 2477 min = (unsigned long *) table->extra1;
2478 max = (unsigned long *) table->extra2;
2479 vleft = table->maxlen / sizeof(unsigned long);
2480 left = *lenp;
2481
2482 for (; left && vleft--; i++, min++, max++, first=0) {
2483 if (write) {
2484 while (left) {
2485 char c;
2486 if (get_user(c, s))
2487 return -EFAULT;
2488 if (!isspace(c))
2489 break;
2490 left--;
2491 s++;
2492 }
2493 if (!left)
2494 break;
2495 neg = 0;
2496 len = left;
2497 if (len > TMPBUFLEN-1)
2498 len = TMPBUFLEN-1;
2499 if (copy_from_user(buf, s, len))
2500 return -EFAULT;
2501 buf[len] = 0;
2502 p = buf;
2503 if (*p == '-' && left > 1) {
2504 neg = 1;
bd9b0bac 2505 p++;
1da177e4
LT		 2506 }
2507 if (*p < '0' || *p > '9')
2508 break;
2509 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2510 len = p-buf;
2511 if ((len < left) && *p && !isspace(*p))
2512 break;
2513 if (neg)
2514 val = -val;
2515 s += len;
2516 left -= len;
2517
2518 if(neg)
2519 continue;
2520 if ((min && val < *min) || (max && val > *max))
2521 continue;
2522 *i = val;
2523 } else {
2524 p = buf;
2525 if (!first)
2526 *p++ = '\t';
2527 sprintf(p, "%lu", convdiv * (*i) / convmul);
2528 len = strlen(buf);
2529 if (len > left)
2530 len = left;
2531 if(copy_to_user(s, buf, len))
2532 return -EFAULT;
2533 left -= len;
2534 s += len;
2535 }
2536 }
2537
2538 if (!write && !first && left) {
2539 if(put_user('\n', s))
2540 return -EFAULT;
2541 left--, s++;
2542 }
2543 if (write) {
2544 while (left) {
2545 char c;
2546 if (get_user(c, s++))
2547 return -EFAULT;
2548 if (!isspace(c))
2549 break;
2550 left--;
2551 }
2552 }
2553 if (write && first)
2554 return -EINVAL;
2555 *lenp -= left;
2556 *ppos += *lenp;
2557 return 0;
2558#undef TMPBUFLEN
2559}
2560
d8217f07 2561static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2562 struct file *filp,
2563 void __user *buffer,
2564 size_t *lenp, loff_t *ppos,
2565 unsigned long convmul,
2566 unsigned long convdiv)
2567{
2568 return __do_proc_doulongvec_minmax(table->data, table, write,
2569 filp, buffer, lenp, ppos, convmul, convdiv);
2570}
2571
1da177e4
LT		 2572/**
2573 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2574 * @table: the sysctl table
2575 * @write: %TRUE if this is a write to the sysctl file
2576 * @filp: the file structure
2577 * @buffer: the user buffer
2578 * @lenp: the size of the user buffer
2579 * @ppos: file position
2580 *
2581 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2582 * values from/to the user buffer, treated as an ASCII string.
2583 *
2584 * This routine will ensure the values are within the range specified by
2585 * table->extra1 (min) and table->extra2 (max).
2586 *
2587 * Returns 0 on success.
2588 */
d8217f07 2589int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2590 void __user *buffer, size_t *lenp, loff_t *ppos)
2591{
2592 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2593}
2594
2595/**
2596 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2597 * @table: the sysctl table
2598 * @write: %TRUE if this is a write to the sysctl file
2599 * @filp: the file structure
2600 * @buffer: the user buffer
2601 * @lenp: the size of the user buffer
2602 * @ppos: file position
2603 *
2604 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2605 * values from/to the user buffer, treated as an ASCII string. The values
2606 * are treated as milliseconds, and converted to jiffies when they are stored.
2607 *
2608 * This routine will ensure the values are within the range specified by
2609 * table->extra1 (min) and table->extra2 (max).
2610 *
2611 * Returns 0 on success.
2612 */
d8217f07 2613int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2614 struct file *filp,
2615 void __user *buffer,
2616 size_t *lenp, loff_t *ppos)
2617{
2618 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2619 lenp, ppos, HZ, 1000l);
2620}
2621
2622
2623static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2624 int *valp,
2625 int write, void *data)
2626{
2627 if (write) {
cba9f33d
BS		 2628 if (*lvalp > LONG_MAX / HZ)
2629 return 1;
1da177e4
LT		 2630 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2631 } else {
2632 int val = *valp;
2633 unsigned long lval;
2634 if (val < 0) {
2635 *negp = -1;
2636 lval = (unsigned long)-val;
2637 } else {
2638 *negp = 0;
2639 lval = (unsigned long)val;
2640 }
2641 *lvalp = lval / HZ;
2642 }
2643 return 0;
2644}
2645
2646static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2647 int *valp,
2648 int write, void *data)
2649{
2650 if (write) {
cba9f33d
BS		 2651 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2652 return 1;
1da177e4
LT		 2653 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2654 } else {
2655 int val = *valp;
2656 unsigned long lval;
2657 if (val < 0) {
2658 *negp = -1;
2659 lval = (unsigned long)-val;
2660 } else {
2661 *negp = 0;
2662 lval = (unsigned long)val;
2663 }
2664 *lvalp = jiffies_to_clock_t(lval);
2665 }
2666 return 0;
2667}
2668
2669static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2670 int *valp,
2671 int write, void *data)
2672{
2673 if (write) {
2674 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2675 } else {
2676 int val = *valp;
2677 unsigned long lval;
2678 if (val < 0) {
2679 *negp = -1;
2680 lval = (unsigned long)-val;
2681 } else {
2682 *negp = 0;
2683 lval = (unsigned long)val;
2684 }
2685 *lvalp = jiffies_to_msecs(lval);
2686 }
2687 return 0;
2688}
2689
2690/**
2691 * proc_dointvec_jiffies - read a vector of integers as seconds
2692 * @table: the sysctl table
2693 * @write: %TRUE if this is a write to the sysctl file
2694 * @filp: the file structure
2695 * @buffer: the user buffer
2696 * @lenp: the size of the user buffer
2697 * @ppos: file position
2698 *
2699 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2700 * values from/to the user buffer, treated as an ASCII string.
2701 * The values read are assumed to be in seconds, and are converted into
2702 * jiffies.
2703 *
2704 * Returns 0 on success.
2705 */
d8217f07 2706int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2707 void __user *buffer, size_t *lenp, loff_t *ppos)
2708{
2709 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2710 do_proc_dointvec_jiffies_conv,NULL);
2711}
2712
2713/**
2714 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2715 * @table: the sysctl table
2716 * @write: %TRUE if this is a write to the sysctl file
2717 * @filp: the file structure
2718 * @buffer: the user buffer
2719 * @lenp: the size of the user buffer
1e5d5331 2720 * @ppos: pointer to the file position
1da177e4
LT		 2721 *
2722 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2723 * values from/to the user buffer, treated as an ASCII string.
2724 * The values read are assumed to be in 1/USER_HZ seconds, and
2725 * are converted into jiffies.
2726 *
2727 * Returns 0 on success.
2728 */
d8217f07 2729int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2730 void __user *buffer, size_t *lenp, loff_t *ppos)
2731{
2732 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2733 do_proc_dointvec_userhz_jiffies_conv,NULL);
2734}
2735
2736/**
2737 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2738 * @table: the sysctl table
2739 * @write: %TRUE if this is a write to the sysctl file
2740 * @filp: the file structure
2741 * @buffer: the user buffer
2742 * @lenp: the size of the user buffer
67be2dd1
MW		 2743 * @ppos: file position
2744 * @ppos: the current position in the file
1da177e4
LT		 2745 *
2746 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2747 * values from/to the user buffer, treated as an ASCII string.
2748 * The values read are assumed to be in 1/1000 seconds, and
2749 * are converted into jiffies.
2750 *
2751 * Returns 0 on success.
2752 */
d8217f07 2753int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2754 void __user *buffer, size_t *lenp, loff_t *ppos)
2755{
2756 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2757 do_proc_dointvec_ms_jiffies_conv, NULL);
2758}
2759
d8217f07 2760static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2761 void __user *buffer, size_t *lenp, loff_t *ppos)
2762{
2763 struct pid *new_pid;
2764 pid_t tmp;
2765 int r;
2766
6c5f3e7b 2767 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2768
2769 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2770 lenp, ppos, NULL, NULL);
2771 if (r || !write)
2772 return r;
2773
2774 new_pid = find_get_pid(tmp);
2775 if (!new_pid)
2776 return -ESRCH;
2777
2778 put_pid(xchg(&cad_pid, new_pid));
2779 return 0;
2780}
2781
1da177e4
LT		 2782#else /* CONFIG_PROC_FS */
2783
d8217f07 2784int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2785 void __user *buffer, size_t *lenp, loff_t *ppos)
2786{
2787 return -ENOSYS;
2788}
2789
d8217f07 2790int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2791 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2792{
2793 return -ENOSYS;
2794}
2795
d8217f07 2796int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2797 void __user *buffer, size_t *lenp, loff_t *ppos)
2798{
2799 return -ENOSYS;
2800}
2801
d8217f07 2802int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2803 void __user *buffer, size_t *lenp, loff_t *ppos)
2804{
2805 return -ENOSYS;
2806}
2807
d8217f07 2808int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2809 void __user *buffer, size_t *lenp, loff_t *ppos)
2810{
2811 return -ENOSYS;
2812}
2813
d8217f07 2814int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2815 void __user *buffer, size_t *lenp, loff_t *ppos)
2816{
2817 return -ENOSYS;
2818}
2819
d8217f07 2820int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2821 void __user *buffer, size_t *lenp, loff_t *ppos)
2822{
2823 return -ENOSYS;
2824}
2825
d8217f07 2826int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2827 struct file *filp,
2828 void __user *buffer,
2829 size_t *lenp, loff_t *ppos)
2830{
2831 return -ENOSYS;
2832}
2833
2834
2835#endif /* CONFIG_PROC_FS */
2836
2837
b89a8171 2838#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2839/*
2840 * General sysctl support routines
2841 */
2842
49a0c458 2843/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2844int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2845 void __user *oldval, size_t __user *oldlenp,
2846 void __user *newval, size_t newlen)
2847{
2848 size_t len;
2849
2850 /* Get out of I don't have a variable */
2851 if (!table->data || !table->maxlen)
2852 return -ENOTDIR;
2853
2854 if (oldval && oldlenp) {
2855 if (get_user(len, oldlenp))
2856 return -EFAULT;
2857 if (len) {
2858 if (len > table->maxlen)
2859 len = table->maxlen;
2860 if (copy_to_user(oldval, table->data, len))
2861 return -EFAULT;
2862 if (put_user(len, oldlenp))
2863 return -EFAULT;
2864 }
2865 }
2866
2867 if (newval && newlen) {
2868 if (newlen > table->maxlen)
2869 newlen = table->maxlen;
2870
2871 if (copy_from_user(table->data, newval, newlen))
2872 return -EFAULT;
2873 }
2874 return 1;
2875}
2876
1da177e4 2877/* The generic string strategy routine: */
f221e726 2878int sysctl_string(struct ctl_table *table,
1da177e4 2879 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2880 void __user *newval, size_t newlen)
1da177e4 2881{
1da177e4
LT		 2882 if (!table->data || !table->maxlen)
2883 return -ENOTDIR;
2884
2885 if (oldval && oldlenp) {
de9e007d
LT		 2886 size_t bufsize;
2887 if (get_user(bufsize, oldlenp))
1da177e4 2888 return -EFAULT;
de9e007d
LT		 2889 if (bufsize) {
2890 size_t len = strlen(table->data), copied;
2891
2892 /* This shouldn't trigger for a well-formed sysctl */
2893 if (len > table->maxlen)
1da177e4 2894 len = table->maxlen;
de9e007d
LT		 2895
2896 /* Copy up to a max of bufsize-1 bytes of the string */
2897 copied = (len >= bufsize) ? bufsize - 1 : len;
2898
2899 if (copy_to_user(oldval, table->data, copied) ||
2900 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2901 return -EFAULT;
de9e007d 2902 if (put_user(len, oldlenp))
1da177e4
LT		 2903 return -EFAULT;
2904 }
2905 }
2906 if (newval && newlen) {
de9e007d 2907 size_t len = newlen;
1da177e4
LT		 2908 if (len > table->maxlen)
2909 len = table->maxlen;
2910 if(copy_from_user(table->data, newval, len))
2911 return -EFAULT;
2912 if (len == table->maxlen)
2913 len--;
2914 ((char *) table->data)[len] = 0;
2915 }
82c9df82 2916 return 1;
1da177e4
LT		 2917}
2918
2919/*
2920 * This function makes sure that all of the integers in the vector
2921 * are between the minimum and maximum values given in the arrays
2922 * table->extra1 and table->extra2, respectively.
2923 */
f221e726 2924int sysctl_intvec(struct ctl_table *table,
1da177e4 2925 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2926 void __user *newval, size_t newlen)
1da177e4
LT		 2927{
2928
2929 if (newval && newlen) {
2930 int __user *vec = (int __user *) newval;
2931 int *min = (int *) table->extra1;
2932 int *max = (int *) table->extra2;
2933 size_t length;
2934 int i;
2935
2936 if (newlen % sizeof(int) != 0)
2937 return -EINVAL;
2938
2939 if (!table->extra1 && !table->extra2)
2940 return 0;
2941
2942 if (newlen > table->maxlen)
2943 newlen = table->maxlen;
2944 length = newlen / sizeof(int);
2945
2946 for (i = 0; i < length; i++) {
2947 int value;
2948 if (get_user(value, vec + i))
2949 return -EFAULT;
2950 if (min && value < min[i])
2951 return -EINVAL;
2952 if (max && value > max[i])
2953 return -EINVAL;
2954 }
2955 }
2956 return 0;
2957}
2958
2959/* Strategy function to convert jiffies to seconds */
f221e726 2960int sysctl_jiffies(struct ctl_table *table,
1da177e4 2961 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2962 void __user *newval, size_t newlen)
1da177e4 2963{
3ee75ac3 2964 if (oldval && oldlenp) {
1da177e4 2965 size_t olen;
3ee75ac3
AD		 2966
2967 if (get_user(olen, oldlenp))
2968 return -EFAULT;
2969 if (olen) {
2970 int val;
2971
2972 if (olen < sizeof(int))
2973 return -EINVAL;
2974
2975 val = *(int *)(table->data) / HZ;
2976 if (put_user(val, (int __user *)oldval))
2977 return -EFAULT;
2978 if (put_user(sizeof(int), oldlenp))
1da177e4 2979 return -EFAULT;
1da177e4 2980 }
1da177e4
LT		 2981 }
2982 if (newval && newlen) {
2983 int new;
2984 if (newlen != sizeof(int))
2985 return -EINVAL;
2986 if (get_user(new, (int __user *)newval))
2987 return -EFAULT;
2988 *(int *)(table->data) = new*HZ;
2989 }
2990 return 1;
2991}
2992
2993/* Strategy function to convert jiffies to seconds */
f221e726 2994int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 2995 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2996 void __user *newval, size_t newlen)
1da177e4 2997{
3ee75ac3 2998 if (oldval && oldlenp) {
1da177e4 2999 size_t olen;
3ee75ac3
AD		 3000
3001 if (get_user(olen, oldlenp))
3002 return -EFAULT;
3003 if (olen) {
3004 int val;
3005
3006 if (olen < sizeof(int))
3007 return -EINVAL;
3008
3009 val = jiffies_to_msecs(*(int *)(table->data));
3010 if (put_user(val, (int __user *)oldval))
3011 return -EFAULT;
3012 if (put_user(sizeof(int), oldlenp))
1da177e4 3013 return -EFAULT;
1da177e4 3014 }
1da177e4
LT		 3015 }
3016 if (newval && newlen) {
3017 int new;
3018 if (newlen != sizeof(int))
3019 return -EINVAL;
3020 if (get_user(new, (int __user *)newval))
3021 return -EFAULT;
3022 *(int *)(table->data) = msecs_to_jiffies(new);
3023 }
3024 return 1;
3025}
3026
c4b8b769 3027
c4b8b769 3028
b89a8171 3029#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3030
3031
1e7bfb21 3032SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3033{
0e009be8 3034 struct __sysctl_args tmp;
7058cb02 3035 int error;
0e009be8 3036
0e009be8
EB		 3037 if (copy_from_user(&tmp, args, sizeof(tmp)))
3038 return -EFAULT;
0e009be8 3039
7058cb02 3040 error = deprecated_sysctl_warning(&tmp);
b89a8171 3041
7058cb02
EB		 3042 /* If no error reading the parameters then just -ENOSYS ... */
3043 if (!error)
3044 error = -ENOSYS;
3045
3046 return error;
1da177e4
LT		 3047}
3048
f221e726 3049int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3050 void __user *oldval, size_t __user *oldlenp,
3051 void __user *newval, size_t newlen)
3052{
3053 return -ENOSYS;
3054}
3055
f221e726 3056int sysctl_string(struct ctl_table *table,
1da177e4 3057 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3058 void __user *newval, size_t newlen)
1da177e4
LT		 3059{
3060 return -ENOSYS;
3061}
3062
f221e726 3063int sysctl_intvec(struct ctl_table *table,
1da177e4 3064 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3065 void __user *newval, size_t newlen)
1da177e4
LT		 3066{
3067 return -ENOSYS;
3068}
3069
f221e726 3070int sysctl_jiffies(struct ctl_table *table,
1da177e4 3071 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3072 void __user *newval, size_t newlen)
1da177e4
LT		 3073{
3074 return -ENOSYS;
3075}
3076
f221e726 3077int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3078 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3079 void __user *newval, size_t newlen)
1da177e4
LT		 3080{
3081 return -ENOSYS;
3082}
3083
b89a8171 3084#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3085
7058cb02
EB		 3086static int deprecated_sysctl_warning(struct __sysctl_args *args)
3087{
3088 static int msg_count;
3089 int name[CTL_MAXNAME];
3090 int i;
3091
6fc48af8
TH		 3092 /* Check args->nlen. */
3093 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3094 return -ENOTDIR;
3095
7058cb02
EB		 3096 /* Read in the sysctl name for better debug message logging */
3097 for (i = 0; i < args->nlen; i++)
3098 if (get_user(name[i], args->name + i))
3099 return -EFAULT;
3100
3101 /* Ignore accesses to kernel.version */
3102 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3103 return 0;
3104
3105 if (msg_count < 5) {
3106 msg_count++;
3107 printk(KERN_INFO
3108 "warning: process `%s' used the deprecated sysctl "
3109 "system call with ", current->comm);
3110 for (i = 0; i < args->nlen; i++)
3111 printk("%d.", name[i]);
3112 printk("\n");
3113 }
3114 return 0;
3115}
3116
1da177e4
LT		 3117/*
3118 * No sense putting this after each symbol definition, twice,
3119 * exception granted :-)
3120 */
3121EXPORT_SYMBOL(proc_dointvec);
3122EXPORT_SYMBOL(proc_dointvec_jiffies);
3123EXPORT_SYMBOL(proc_dointvec_minmax);
3124EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3125EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3126EXPORT_SYMBOL(proc_dostring);
3127EXPORT_SYMBOL(proc_doulongvec_minmax);
3128EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3129EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3130EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3131EXPORT_SYMBOL(sysctl_intvec);
3132EXPORT_SYMBOL(sysctl_jiffies);
3133EXPORT_SYMBOL(sysctl_ms_jiffies);
3134EXPORT_SYMBOL(sysctl_string);
49a0c458 3135EXPORT_SYMBOL(sysctl_data);
1da177e4 3136EXPORT_SYMBOL(unregister_sysctl_table);
Linux kernel - Deliverables
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