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[net-next-2.6.git] / kernel / sysctl.c
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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 },
0741f4d2
CE		 732 {
733 .ctl_name = CTL_UNNUMBERED,
734 .procname = "kstack_depth_to_print",
735 .data = &kstack_depth_to_print,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = &proc_dointvec,
739 },
6e7c4025
IM		 740 {
741 .ctl_name = CTL_UNNUMBERED,
742 .procname = "io_delay_type",
743 .data = &io_delay_type,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = &proc_dointvec,
747 },
1da177e4 748#endif
7a9166e3 749#if defined(CONFIG_MMU)
1da177e4
LT		 750 {
751 .ctl_name = KERN_RANDOMIZE,
752 .procname = "randomize_va_space",
753 .data = &randomize_va_space,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = &proc_dointvec,
757 },
7a9166e3 758#endif
0152fb37 759#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 760 {
761 .ctl_name = KERN_SPIN_RETRY,
762 .procname = "spin_retry",
763 .data = &spin_retry,
764 .maxlen = sizeof (int),
765 .mode = 0644,
766 .proc_handler = &proc_dointvec,
767 },
c255d844 768#endif
673d5b43 769#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 770 {
c255d844 771 .procname = "acpi_video_flags",
77afcf78 772 .data = &acpi_realmode_flags,
c255d844
PM		 773 .maxlen = sizeof (unsigned long),
774 .mode = 0644,
7f99f06f 775 .proc_handler = &proc_doulongvec_minmax,
c255d844 776 },
d2b176ed
JS		 777#endif
778#ifdef CONFIG_IA64
779 {
780 .ctl_name = KERN_IA64_UNALIGNED,
781 .procname = "ignore-unaligned-usertrap",
782 .data = &no_unaligned_warning,
783 .maxlen = sizeof (int),
784 .mode = 0644,
785 .proc_handler = &proc_dointvec,
786 },
88fc241f
DC		 787 {
788 .ctl_name = CTL_UNNUMBERED,
789 .procname = "unaligned-dump-stack",
790 .data = &unaligned_dump_stack,
791 .maxlen = sizeof (int),
792 .mode = 0644,
793 .proc_handler = &proc_dointvec,
794 },
bebfa101 795#endif
c4f3b63f 796#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 797 {
798 .ctl_name = CTL_UNNUMBERED,
799 .procname = "softlockup_panic",
800 .data = &softlockup_panic,
801 .maxlen = sizeof(int),
802 .mode = 0644,
4dca10a9 803 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 804 .strategy = &sysctl_intvec,
805 .extra1 = &zero,
806 .extra2 = &one,
807 },
c4f3b63f
RT		 808 {
809 .ctl_name = CTL_UNNUMBERED,
810 .procname = "softlockup_thresh",
811 .data = &softlockup_thresh,
9383d967 812 .maxlen = sizeof(int),
c4f3b63f 813 .mode = 0644,
baf48f65 814 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 815 .strategy = &sysctl_intvec,
9383d967 816 .extra1 = &neg_one,
c4f3b63f
RT		 817 .extra2 = &sixty,
818 },
e162b39a
MSB		 819#endif
820#ifdef CONFIG_DETECT_HUNG_TASK
821 {
822 .ctl_name = CTL_UNNUMBERED,
823 .procname = "hung_task_panic",
824 .data = &sysctl_hung_task_panic,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = &proc_dointvec_minmax,
828 .strategy = &sysctl_intvec,
829 .extra1 = &zero,
830 .extra2 = &one,
831 },
82a1fcb9
IM		 832 {
833 .ctl_name = CTL_UNNUMBERED,
834 .procname = "hung_task_check_count",
835 .data = &sysctl_hung_task_check_count,
90739081 836 .maxlen = sizeof(unsigned long),
82a1fcb9 837 .mode = 0644,
90739081 838 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 839 .strategy = &sysctl_intvec,
840 },
841 {
842 .ctl_name = CTL_UNNUMBERED,
843 .procname = "hung_task_timeout_secs",
844 .data = &sysctl_hung_task_timeout_secs,
90739081 845 .maxlen = sizeof(unsigned long),
82a1fcb9 846 .mode = 0644,
e162b39a 847 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 848 .strategy = &sysctl_intvec,
849 },
850 {
851 .ctl_name = CTL_UNNUMBERED,
852 .procname = "hung_task_warnings",
853 .data = &sysctl_hung_task_warnings,
90739081 854 .maxlen = sizeof(unsigned long),
82a1fcb9 855 .mode = 0644,
90739081 856 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 857 .strategy = &sysctl_intvec,
858 },
c4f3b63f 859#endif
bebfa101
AK		 860#ifdef CONFIG_COMPAT
861 {
862 .ctl_name = KERN_COMPAT_LOG,
863 .procname = "compat-log",
864 .data = &compat_log,
865 .maxlen = sizeof (int),
866 .mode = 0644,
867 .proc_handler = &proc_dointvec,
868 },
951f22d5 869#endif
23f78d4a
IM		 870#ifdef CONFIG_RT_MUTEXES
871 {
872 .ctl_name = KERN_MAX_LOCK_DEPTH,
873 .procname = "max_lock_depth",
874 .data = &max_lock_depth,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = &proc_dointvec,
878 },
5096add8 879#endif
10a0a8d4
JF		 880 {
881 .ctl_name = CTL_UNNUMBERED,
882 .procname = "poweroff_cmd",
883 .data = &poweroff_cmd,
884 .maxlen = POWEROFF_CMD_PATH_LEN,
885 .mode = 0644,
886 .proc_handler = &proc_dostring,
887 .strategy = &sysctl_string,
888 },
0b77f5bf
DH		 889#ifdef CONFIG_KEYS
890 {
891 .ctl_name = CTL_UNNUMBERED,
892 .procname = "keys",
893 .mode = 0555,
894 .child = key_sysctls,
895 },
896#endif
31a72bce
PM		 897#ifdef CONFIG_RCU_TORTURE_TEST
898 {
899 .ctl_name = CTL_UNNUMBERED,
900 .procname = "rcutorture_runnable",
901 .data = &rcutorture_runnable,
902 .maxlen = sizeof(int),
903 .mode = 0644,
904 .proc_handler = &proc_dointvec,
905 },
906#endif
12e22c5e
DH		 907#ifdef CONFIG_SLOW_WORK
908 {
909 .ctl_name = CTL_UNNUMBERED,
910 .procname = "slow-work",
911 .mode = 0555,
912 .child = slow_work_sysctls,
913 },
914#endif
ed2c12f3
AM		 915/*
916 * NOTE: do not add new entries to this table unless you have read
917 * Documentation/sysctl/ctl_unnumbered.txt
918 */
1da177e4
LT		 919 { .ctl_name = 0 }
920};
921
d8217f07 922static struct ctl_table vm_table[] = {
1da177e4
LT		 923 {
924 .ctl_name = VM_OVERCOMMIT_MEMORY,
925 .procname = "overcommit_memory",
926 .data = &sysctl_overcommit_memory,
927 .maxlen = sizeof(sysctl_overcommit_memory),
928 .mode = 0644,
929 .proc_handler = &proc_dointvec,
930 },
fadd8fbd
KH		 931 {
932 .ctl_name = VM_PANIC_ON_OOM,
933 .procname = "panic_on_oom",
934 .data = &sysctl_panic_on_oom,
935 .maxlen = sizeof(sysctl_panic_on_oom),
936 .mode = 0644,
937 .proc_handler = &proc_dointvec,
938 },
fe071d7e
DR		 939 {
940 .ctl_name = CTL_UNNUMBERED,
941 .procname = "oom_kill_allocating_task",
942 .data = &sysctl_oom_kill_allocating_task,
943 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
944 .mode = 0644,
945 .proc_handler = &proc_dointvec,
946 },
fef1bdd6
DR		 947 {
948 .ctl_name = CTL_UNNUMBERED,
949 .procname = "oom_dump_tasks",
950 .data = &sysctl_oom_dump_tasks,
951 .maxlen = sizeof(sysctl_oom_dump_tasks),
952 .mode = 0644,
953 .proc_handler = &proc_dointvec,
954 },
1da177e4
LT		 955 {
956 .ctl_name = VM_OVERCOMMIT_RATIO,
957 .procname = "overcommit_ratio",
958 .data = &sysctl_overcommit_ratio,
959 .maxlen = sizeof(sysctl_overcommit_ratio),
960 .mode = 0644,
961 .proc_handler = &proc_dointvec,
962 },
963 {
964 .ctl_name = VM_PAGE_CLUSTER,
965 .procname = "page-cluster",
966 .data = &page_cluster,
967 .maxlen = sizeof(int),
968 .mode = 0644,
969 .proc_handler = &proc_dointvec,
970 },
971 {
972 .ctl_name = VM_DIRTY_BACKGROUND,
973 .procname = "dirty_background_ratio",
974 .data = &dirty_background_ratio,
975 .maxlen = sizeof(dirty_background_ratio),
976 .mode = 0644,
2da02997 977 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 978 .strategy = &sysctl_intvec,
979 .extra1 = &zero,
980 .extra2 = &one_hundred,
981 },
2da02997
DR		 982 {
983 .ctl_name = CTL_UNNUMBERED,
984 .procname = "dirty_background_bytes",
985 .data = &dirty_background_bytes,
986 .maxlen = sizeof(dirty_background_bytes),
987 .mode = 0644,
988 .proc_handler = &dirty_background_bytes_handler,
989 .strategy = &sysctl_intvec,
fc3501d4 990 .extra1 = &one_ul,
2da02997 991 },
1da177e4
LT		 992 {
993 .ctl_name = VM_DIRTY_RATIO,
994 .procname = "dirty_ratio",
995 .data = &vm_dirty_ratio,
996 .maxlen = sizeof(vm_dirty_ratio),
997 .mode = 0644,
04fbfdc1 998 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 999 .strategy = &sysctl_intvec,
1000 .extra1 = &zero,
1001 .extra2 = &one_hundred,
1002 },
2da02997
DR		 1003 {
1004 .ctl_name = CTL_UNNUMBERED,
1005 .procname = "dirty_bytes",
1006 .data = &vm_dirty_bytes,
1007 .maxlen = sizeof(vm_dirty_bytes),
1008 .mode = 0644,
1009 .proc_handler = &dirty_bytes_handler,
1010 .strategy = &sysctl_intvec,
9e4a5bda 1011 .extra1 = &dirty_bytes_min,
2da02997 1012 },
1da177e4 1013 {
1da177e4 1014 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1015 .data = &dirty_writeback_interval,
1016 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1017 .mode = 0644,
1018 .proc_handler = &dirty_writeback_centisecs_handler,
1019 },
1020 {
1da177e4 1021 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1022 .data = &dirty_expire_interval,
1023 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1024 .mode = 0644,
704503d8 1025 .proc_handler = &proc_dointvec,
1da177e4
LT		 1026 },
1027 {
1028 .ctl_name = VM_NR_PDFLUSH_THREADS,
1029 .procname = "nr_pdflush_threads",
1030 .data = &nr_pdflush_threads,
1031 .maxlen = sizeof nr_pdflush_threads,
1032 .mode = 0444 /* read-only*/,
1033 .proc_handler = &proc_dointvec,
1034 },
1035 {
1036 .ctl_name = VM_SWAPPINESS,
1037 .procname = "swappiness",
1038 .data = &vm_swappiness,
1039 .maxlen = sizeof(vm_swappiness),
1040 .mode = 0644,
1041 .proc_handler = &proc_dointvec_minmax,
1042 .strategy = &sysctl_intvec,
1043 .extra1 = &zero,
1044 .extra2 = &one_hundred,
1045 },
1046#ifdef CONFIG_HUGETLB_PAGE
1047 {
1da177e4 1048 .procname = "nr_hugepages",
e5ff2159 1049 .data = NULL,
1da177e4
LT		 1050 .maxlen = sizeof(unsigned long),
1051 .mode = 0644,
1052 .proc_handler = &hugetlb_sysctl_handler,
1053 .extra1 = (void *)&hugetlb_zero,
1054 .extra2 = (void *)&hugetlb_infinity,
1055 },
1056 {
1057 .ctl_name = VM_HUGETLB_GROUP,
1058 .procname = "hugetlb_shm_group",
1059 .data = &sysctl_hugetlb_shm_group,
1060 .maxlen = sizeof(gid_t),
1061 .mode = 0644,
1062 .proc_handler = &proc_dointvec,
1063 },
396faf03
MG		 1064 {
1065 .ctl_name = CTL_UNNUMBERED,
1066 .procname = "hugepages_treat_as_movable",
1067 .data = &hugepages_treat_as_movable,
1068 .maxlen = sizeof(int),
1069 .mode = 0644,
1070 .proc_handler = &hugetlb_treat_movable_handler,
1071 },
d1c3fb1f
NA		 1072 {
1073 .ctl_name = CTL_UNNUMBERED,
1074 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1075 .data = NULL,
1076 .maxlen = sizeof(unsigned long),
d1c3fb1f 1077 .mode = 0644,
a3d0c6aa 1078 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1079 .extra1 = (void *)&hugetlb_zero,
1080 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1081 },
1da177e4
LT		 1082#endif
1083 {
1084 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1085 .procname = "lowmem_reserve_ratio",
1086 .data = &sysctl_lowmem_reserve_ratio,
1087 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1088 .mode = 0644,
1089 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1090 .strategy = &sysctl_intvec,
1091 },
9d0243bc
AM		 1092 {
1093 .ctl_name = VM_DROP_PAGECACHE,
1094 .procname = "drop_caches",
1095 .data = &sysctl_drop_caches,
1096 .maxlen = sizeof(int),
1097 .mode = 0644,
1098 .proc_handler = drop_caches_sysctl_handler,
1099 .strategy = &sysctl_intvec,
1100 },
1da177e4
LT		 1101 {
1102 .ctl_name = VM_MIN_FREE_KBYTES,
1103 .procname = "min_free_kbytes",
1104 .data = &min_free_kbytes,
1105 .maxlen = sizeof(min_free_kbytes),
1106 .mode = 0644,
1107 .proc_handler = &min_free_kbytes_sysctl_handler,
1108 .strategy = &sysctl_intvec,
1109 .extra1 = &zero,
1110 },
8ad4b1fb
RS		 1111 {
1112 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1113 .procname = "percpu_pagelist_fraction",
1114 .data = &percpu_pagelist_fraction,
1115 .maxlen = sizeof(percpu_pagelist_fraction),
1116 .mode = 0644,
1117 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1118 .strategy = &sysctl_intvec,
1119 .extra1 = &min_percpu_pagelist_fract,
1120 },
1da177e4
LT		 1121#ifdef CONFIG_MMU
1122 {
1123 .ctl_name = VM_MAX_MAP_COUNT,
1124 .procname = "max_map_count",
1125 .data = &sysctl_max_map_count,
1126 .maxlen = sizeof(sysctl_max_map_count),
1127 .mode = 0644,
1128 .proc_handler = &proc_dointvec
1129 },
dd8632a1
PM		 1130#else
1131 {
1132 .ctl_name = CTL_UNNUMBERED,
1133 .procname = "nr_trim_pages",
1134 .data = &sysctl_nr_trim_pages,
1135 .maxlen = sizeof(sysctl_nr_trim_pages),
1136 .mode = 0644,
1137 .proc_handler = &proc_dointvec_minmax,
1138 .strategy = &sysctl_intvec,
1139 .extra1 = &zero,
1140 },
1da177e4
LT		 1141#endif
1142 {
1143 .ctl_name = VM_LAPTOP_MODE,
1144 .procname = "laptop_mode",
1145 .data = &laptop_mode,
1146 .maxlen = sizeof(laptop_mode),
1147 .mode = 0644,
ed5b43f1
BS		 1148 .proc_handler = &proc_dointvec_jiffies,
1149 .strategy = &sysctl_jiffies,
1da177e4
LT		 1150 },
1151 {
1152 .ctl_name = VM_BLOCK_DUMP,
1153 .procname = "block_dump",
1154 .data = &block_dump,
1155 .maxlen = sizeof(block_dump),
1156 .mode = 0644,
1157 .proc_handler = &proc_dointvec,
1158 .strategy = &sysctl_intvec,
1159 .extra1 = &zero,
1160 },
1161 {
1162 .ctl_name = VM_VFS_CACHE_PRESSURE,
1163 .procname = "vfs_cache_pressure",
1164 .data = &sysctl_vfs_cache_pressure,
1165 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1166 .mode = 0644,
1167 .proc_handler = &proc_dointvec,
1168 .strategy = &sysctl_intvec,
1169 .extra1 = &zero,
1170 },
1171#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1172 {
1173 .ctl_name = VM_LEGACY_VA_LAYOUT,
1174 .procname = "legacy_va_layout",
1175 .data = &sysctl_legacy_va_layout,
1176 .maxlen = sizeof(sysctl_legacy_va_layout),
1177 .mode = 0644,
1178 .proc_handler = &proc_dointvec,
1179 .strategy = &sysctl_intvec,
1180 .extra1 = &zero,
1181 },
1182#endif
1743660b
CL		 1183#ifdef CONFIG_NUMA
1184 {
1185 .ctl_name = VM_ZONE_RECLAIM_MODE,
1186 .procname = "zone_reclaim_mode",
1187 .data = &zone_reclaim_mode,
1188 .maxlen = sizeof(zone_reclaim_mode),
1189 .mode = 0644,
1190 .proc_handler = &proc_dointvec,
c84db23c
CL		 1191 .strategy = &sysctl_intvec,
1192 .extra1 = &zero,
1743660b 1193 },
9614634f
CL		 1194 {
1195 .ctl_name = VM_MIN_UNMAPPED,
1196 .procname = "min_unmapped_ratio",
1197 .data = &sysctl_min_unmapped_ratio,
1198 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1199 .mode = 0644,
1200 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1201 .strategy = &sysctl_intvec,
1202 .extra1 = &zero,
1203 .extra2 = &one_hundred,
1204 },
0ff38490
CL		 1205 {
1206 .ctl_name = VM_MIN_SLAB,
1207 .procname = "min_slab_ratio",
1208 .data = &sysctl_min_slab_ratio,
1209 .maxlen = sizeof(sysctl_min_slab_ratio),
1210 .mode = 0644,
1211 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1212 .strategy = &sysctl_intvec,
1213 .extra1 = &zero,
1214 .extra2 = &one_hundred,
1215 },
e6e5494c 1216#endif
77461ab3
CL		 1217#ifdef CONFIG_SMP
1218 {
1219 .ctl_name = CTL_UNNUMBERED,
1220 .procname = "stat_interval",
1221 .data = &sysctl_stat_interval,
1222 .maxlen = sizeof(sysctl_stat_interval),
1223 .mode = 0644,
1224 .proc_handler = &proc_dointvec_jiffies,
1225 .strategy = &sysctl_jiffies,
1226 },
1227#endif
ed032189
EP		 1228#ifdef CONFIG_SECURITY
1229 {
1230 .ctl_name = CTL_UNNUMBERED,
1231 .procname = "mmap_min_addr",
1232 .data = &mmap_min_addr,
1233 .maxlen = sizeof(unsigned long),
1234 .mode = 0644,
1235 .proc_handler = &proc_doulongvec_minmax,
1236 },
8daec965 1237#endif
f0c0b2b8
KH		 1238#ifdef CONFIG_NUMA
1239 {
1240 .ctl_name = CTL_UNNUMBERED,
1241 .procname = "numa_zonelist_order",
1242 .data = &numa_zonelist_order,
1243 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1244 .mode = 0644,
1245 .proc_handler = &numa_zonelist_order_handler,
1246 .strategy = &sysctl_string,
1247 },
1248#endif
2b8232ce 1249#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1250 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1251 {
1252 .ctl_name = VM_VDSO_ENABLED,
1253 .procname = "vdso_enabled",
1254 .data = &vdso_enabled,
1255 .maxlen = sizeof(vdso_enabled),
1256 .mode = 0644,
1257 .proc_handler = &proc_dointvec,
1258 .strategy = &sysctl_intvec,
1259 .extra1 = &zero,
1260 },
1da177e4 1261#endif
195cf453
BG		 1262#ifdef CONFIG_HIGHMEM
1263 {
1264 .ctl_name = CTL_UNNUMBERED,
1265 .procname = "highmem_is_dirtyable",
1266 .data = &vm_highmem_is_dirtyable,
1267 .maxlen = sizeof(vm_highmem_is_dirtyable),
1268 .mode = 0644,
1269 .proc_handler = &proc_dointvec_minmax,
1270 .strategy = &sysctl_intvec,
1271 .extra1 = &zero,
1272 .extra2 = &one,
1273 },
1274#endif
4be6f6bb
PZ		 1275#ifdef CONFIG_UNEVICTABLE_LRU
1276 {
1277 .ctl_name = CTL_UNNUMBERED,
1278 .procname = "scan_unevictable_pages",
1279 .data = &scan_unevictable_pages,
1280 .maxlen = sizeof(scan_unevictable_pages),
1281 .mode = 0644,
1282 .proc_handler = &scan_unevictable_handler,
1283 },
1284#endif
2be7fe07
AM		 1285/*
1286 * NOTE: do not add new entries to this table unless you have read
1287 * Documentation/sysctl/ctl_unnumbered.txt
1288 */
1da177e4
LT		 1289 { .ctl_name = 0 }
1290};
1291
2abc26fc 1292#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1293static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1294 { .ctl_name = 0 }
1295};
1296#endif
1297
d8217f07 1298static struct ctl_table fs_table[] = {
1da177e4
LT		 1299 {
1300 .ctl_name = FS_NRINODE,
1301 .procname = "inode-nr",
1302 .data = &inodes_stat,
1303 .maxlen = 2*sizeof(int),
1304 .mode = 0444,
1305 .proc_handler = &proc_dointvec,
1306 },
1307 {
1308 .ctl_name = FS_STATINODE,
1309 .procname = "inode-state",
1310 .data = &inodes_stat,
1311 .maxlen = 7*sizeof(int),
1312 .mode = 0444,
1313 .proc_handler = &proc_dointvec,
1314 },
1315 {
1da177e4
LT		 1316 .procname = "file-nr",
1317 .data = &files_stat,
1318 .maxlen = 3*sizeof(int),
1319 .mode = 0444,
529bf6be 1320 .proc_handler = &proc_nr_files,
1da177e4
LT		 1321 },
1322 {
1323 .ctl_name = FS_MAXFILE,
1324 .procname = "file-max",
1325 .data = &files_stat.max_files,
1326 .maxlen = sizeof(int),
1327 .mode = 0644,
1328 .proc_handler = &proc_dointvec,
1329 },
9cfe015a
ED		 1330 {
1331 .ctl_name = CTL_UNNUMBERED,
1332 .procname = "nr_open",
1333 .data = &sysctl_nr_open,
1334 .maxlen = sizeof(int),
1335 .mode = 0644,
eceea0b3
AV		 1336 .proc_handler = &proc_dointvec_minmax,
1337 .extra1 = &sysctl_nr_open_min,
1338 .extra2 = &sysctl_nr_open_max,
9cfe015a 1339 },
1da177e4
LT		 1340 {
1341 .ctl_name = FS_DENTRY,
1342 .procname = "dentry-state",
1343 .data = &dentry_stat,
1344 .maxlen = 6*sizeof(int),
1345 .mode = 0444,
1346 .proc_handler = &proc_dointvec,
1347 },
1348 {
1349 .ctl_name = FS_OVERFLOWUID,
1350 .procname = "overflowuid",
1351 .data = &fs_overflowuid,
1352 .maxlen = sizeof(int),
1353 .mode = 0644,
1354 .proc_handler = &proc_dointvec_minmax,
1355 .strategy = &sysctl_intvec,
1356 .extra1 = &minolduid,
1357 .extra2 = &maxolduid,
1358 },
1359 {
1360 .ctl_name = FS_OVERFLOWGID,
1361 .procname = "overflowgid",
1362 .data = &fs_overflowgid,
1363 .maxlen = sizeof(int),
1364 .mode = 0644,
1365 .proc_handler = &proc_dointvec_minmax,
1366 .strategy = &sysctl_intvec,
1367 .extra1 = &minolduid,
1368 .extra2 = &maxolduid,
1369 },
bfcd17a6 1370#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1371 {
1372 .ctl_name = FS_LEASES,
1373 .procname = "leases-enable",
1374 .data = &leases_enable,
1375 .maxlen = sizeof(int),
1376 .mode = 0644,
1377 .proc_handler = &proc_dointvec,
1378 },
bfcd17a6 1379#endif
1da177e4
LT		 1380#ifdef CONFIG_DNOTIFY
1381 {
1382 .ctl_name = FS_DIR_NOTIFY,
1383 .procname = "dir-notify-enable",
1384 .data = &dir_notify_enable,
1385 .maxlen = sizeof(int),
1386 .mode = 0644,
1387 .proc_handler = &proc_dointvec,
1388 },
1389#endif
1390#ifdef CONFIG_MMU
bfcd17a6 1391#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1392 {
1393 .ctl_name = FS_LEASE_TIME,
1394 .procname = "lease-break-time",
1395 .data = &lease_break_time,
1396 .maxlen = sizeof(int),
1397 .mode = 0644,
8e654fba 1398 .proc_handler = &proc_dointvec,
1da177e4 1399 },
bfcd17a6 1400#endif
ebf3f09c 1401#ifdef CONFIG_AIO
1da177e4 1402 {
1da177e4
LT		 1403 .procname = "aio-nr",
1404 .data = &aio_nr,
1405 .maxlen = sizeof(aio_nr),
1406 .mode = 0444,
d55b5fda 1407 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1408 },
1409 {
1da177e4
LT		 1410 .procname = "aio-max-nr",
1411 .data = &aio_max_nr,
1412 .maxlen = sizeof(aio_max_nr),
1413 .mode = 0644,
d55b5fda 1414 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1415 },
ebf3f09c 1416#endif /* CONFIG_AIO */
2d9048e2 1417#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1418 {
1419 .ctl_name = FS_INOTIFY,
1420 .procname = "inotify",
1421 .mode = 0555,
1422 .child = inotify_table,
1423 },
1424#endif
7ef9964e
DL		 1425#ifdef CONFIG_EPOLL
1426 {
1427 .procname = "epoll",
1428 .mode = 0555,
1429 .child = epoll_table,
1430 },
1431#endif
1da177e4 1432#endif
d6e71144
AC		 1433 {
1434 .ctl_name = KERN_SETUID_DUMPABLE,
1435 .procname = "suid_dumpable",
1436 .data = &suid_dumpable,
1437 .maxlen = sizeof(int),
1438 .mode = 0644,
8e654fba
MW		 1439 .proc_handler = &proc_dointvec_minmax,
1440 .strategy = &sysctl_intvec,
1441 .extra1 = &zero,
1442 .extra2 = &two,
d6e71144 1443 },
2abc26fc
EB		 1444#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1445 {
1446 .ctl_name = CTL_UNNUMBERED,
1447 .procname = "binfmt_misc",
1448 .mode = 0555,
1449 .child = binfmt_misc_table,
1450 },
1451#endif
2be7fe07
AM		 1452/*
1453 * NOTE: do not add new entries to this table unless you have read
1454 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1455 */
1da177e4
LT		 1456 { .ctl_name = 0 }
1457};
1458
d8217f07 1459static struct ctl_table debug_table[] = {
d0c3d534 1460#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1461 {
1462 .ctl_name = CTL_UNNUMBERED,
1463 .procname = "exception-trace",
1464 .data = &show_unhandled_signals,
1465 .maxlen = sizeof(int),
1466 .mode = 0644,
1467 .proc_handler = proc_dointvec
1468 },
1469#endif
1da177e4
LT		 1470 { .ctl_name = 0 }
1471};
1472
d8217f07 1473static struct ctl_table dev_table[] = {
1da177e4 1474 { .ctl_name = 0 }
0eeca283 1475};
1da177e4 1476
330d57fb
AV		 1477static DEFINE_SPINLOCK(sysctl_lock);
1478
1479/* called under sysctl_lock */
1480static int use_table(struct ctl_table_header *p)
1481{
1482 if (unlikely(p->unregistering))
1483 return 0;
1484 p->used++;
1485 return 1;
1486}
1487
1488/* called under sysctl_lock */
1489static void unuse_table(struct ctl_table_header *p)
1490{
1491 if (!--p->used)
1492 if (unlikely(p->unregistering))
1493 complete(p->unregistering);
1494}
1495
1496/* called under sysctl_lock, will reacquire if has to wait */
1497static void start_unregistering(struct ctl_table_header *p)
1498{
1499 /*
1500 * if p->used is 0, nobody will ever touch that entry again;
1501 * we'll eliminate all paths to it before dropping sysctl_lock
1502 */
1503 if (unlikely(p->used)) {
1504 struct completion wait;
1505 init_completion(&wait);
1506 p->unregistering = &wait;
1507 spin_unlock(&sysctl_lock);
1508 wait_for_completion(&wait);
1509 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1510 } else {
1511 /* anything non-NULL; we'll never dereference it */
1512 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1513 }
1514 /*
1515 * do not remove from the list until nobody holds it; walking the
1516 * list in do_sysctl() relies on that.
1517 */
1518 list_del_init(&p->ctl_entry);
1519}
1520
f7e6ced4
AV		 1521void sysctl_head_get(struct ctl_table_header *head)
1522{
1523 spin_lock(&sysctl_lock);
1524 head->count++;
1525 spin_unlock(&sysctl_lock);
1526}
1527
1528void sysctl_head_put(struct ctl_table_header *head)
1529{
1530 spin_lock(&sysctl_lock);
1531 if (!--head->count)
1532 kfree(head);
1533 spin_unlock(&sysctl_lock);
1534}
1535
1536struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1537{
1538 if (!head)
1539 BUG();
1540 spin_lock(&sysctl_lock);
1541 if (!use_table(head))
1542 head = ERR_PTR(-ENOENT);
1543 spin_unlock(&sysctl_lock);
1544 return head;
1545}
1546
805b5d5e
EB		 1547void sysctl_head_finish(struct ctl_table_header *head)
1548{
1549 if (!head)
1550 return;
1551 spin_lock(&sysctl_lock);
1552 unuse_table(head);
1553 spin_unlock(&sysctl_lock);
1554}
1555
73455092
AV		 1556static struct ctl_table_set *
1557lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1558{
1559 struct ctl_table_set *set = &root->default_set;
1560 if (root->lookup)
1561 set = root->lookup(root, namespaces);
1562 return set;
1563}
1564
e51b6ba0
EB		 1565static struct list_head *
1566lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1567{
73455092
AV		 1568 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1569 return &set->list;
e51b6ba0
EB		 1570}
1571
1572struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1573 struct ctl_table_header *prev)
1574{
1575 struct ctl_table_root *root;
1576 struct list_head *header_list;
805b5d5e
EB		 1577 struct ctl_table_header *head;
1578 struct list_head *tmp;
e51b6ba0 1579
805b5d5e
EB		 1580 spin_lock(&sysctl_lock);
1581 if (prev) {
e51b6ba0 1582 head = prev;
805b5d5e
EB		 1583 tmp = &prev->ctl_entry;
1584 unuse_table(prev);
1585 goto next;
1586 }
1587 tmp = &root_table_header.ctl_entry;
1588 for (;;) {
1589 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1590
1591 if (!use_table(head))
1592 goto next;
1593 spin_unlock(&sysctl_lock);
1594 return head;
1595 next:
e51b6ba0 1596 root = head->root;
805b5d5e 1597 tmp = tmp->next;
e51b6ba0
EB		 1598 header_list = lookup_header_list(root, namespaces);
1599 if (tmp != header_list)
1600 continue;
1601
1602 do {
1603 root = list_entry(root->root_list.next,
1604 struct ctl_table_root, root_list);
1605 if (root == &sysctl_table_root)
1606 goto out;
1607 header_list = lookup_header_list(root, namespaces);
1608 } while (list_empty(header_list));
1609 tmp = header_list->next;
805b5d5e 1610 }
e51b6ba0 1611out:
805b5d5e
EB		 1612 spin_unlock(&sysctl_lock);
1613 return NULL;
1614}
1615
e51b6ba0
EB		 1616struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1617{
1618 return __sysctl_head_next(current->nsproxy, prev);
1619}
1620
1621void register_sysctl_root(struct ctl_table_root *root)
1622{
1623 spin_lock(&sysctl_lock);
1624 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1625 spin_unlock(&sysctl_lock);
1626}
1627
b89a8171 1628#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1629/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1630static int do_sysctl_strategy(struct ctl_table_root *root,
1631 struct ctl_table *table,
2c4c7155
PE		 1632 void __user *oldval, size_t __user *oldlenp,
1633 void __user *newval, size_t newlen)
1634{
1635 int op = 0, rc;
1636
1637 if (oldval)
e6305c43 1638 op |= MAY_READ;
2c4c7155 1639 if (newval)
e6305c43 1640 op |= MAY_WRITE;
d7321cd6 1641 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1642 return -EPERM;
1643
1644 if (table->strategy) {
f221e726 1645 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1646 if (rc < 0)
1647 return rc;
1648 if (rc > 0)
1649 return 0;
1650 }
1651
1652 /* If there is no strategy routine, or if the strategy returns
1653 * zero, proceed with automatic r/w */
1654 if (table->data && table->maxlen) {
f221e726 1655 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1656 if (rc < 0)
1657 return rc;
1658 }
1659 return 0;
1660}
1661
1662static int parse_table(int __user *name, int nlen,
1663 void __user *oldval, size_t __user *oldlenp,
1664 void __user *newval, size_t newlen,
d7321cd6 1665 struct ctl_table_root *root,
2c4c7155
PE		 1666 struct ctl_table *table)
1667{
1668 int n;
1669repeat:
1670 if (!nlen)
1671 return -ENOTDIR;
1672 if (get_user(n, name))
1673 return -EFAULT;
1674 for ( ; table->ctl_name || table->procname; table++) {
1675 if (!table->ctl_name)
1676 continue;
1677 if (n == table->ctl_name) {
1678 int error;
1679 if (table->child) {
e6305c43 1680 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1681 return -EPERM;
1682 name++;
1683 nlen--;
1684 table = table->child;
1685 goto repeat;
1686 }
f221e726 1687 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1688 oldval, oldlenp,
1689 newval, newlen);
1690 return error;
1691 }
1692 }
1693 return -ENOTDIR;
1694}
1695
1da177e4
LT		 1696int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1697 void __user *newval, size_t newlen)
1698{
805b5d5e 1699 struct ctl_table_header *head;
330d57fb 1700 int error = -ENOTDIR;
1da177e4
LT		 1701
1702 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1703 return -ENOTDIR;
1704 if (oldval) {
1705 int old_len;
1706 if (!oldlenp || get_user(old_len, oldlenp))
1707 return -EFAULT;
1708 }
330d57fb 1709
805b5d5e
EB		 1710 for (head = sysctl_head_next(NULL); head;
1711 head = sysctl_head_next(head)) {
330d57fb 1712 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1713 newval, newlen,
1714 head->root, head->ctl_table);
805b5d5e
EB		 1715 if (error != -ENOTDIR) {
1716 sysctl_head_finish(head);
330d57fb 1717 break;
805b5d5e
EB		 1718 }
1719 }
330d57fb 1720 return error;
1da177e4
LT		 1721}
1722
1e7bfb21 1723SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1724{
1725 struct __sysctl_args tmp;
1726 int error;
1727
1728 if (copy_from_user(&tmp, args, sizeof(tmp)))
1729 return -EFAULT;
1730
7058cb02
EB		 1731 error = deprecated_sysctl_warning(&tmp);
1732 if (error)
1733 goto out;
1734
1da177e4
LT		 1735 lock_kernel();
1736 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1737 tmp.newval, tmp.newlen);
1738 unlock_kernel();
7058cb02 1739out:
1da177e4
LT		 1740 return error;
1741}
b89a8171 1742#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1743
1744/*
1ff007eb 1745 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1746 * some sysctl variables are readonly even to root.
1747 */
1748
1749static int test_perm(int mode, int op)
1750{
76aac0e9 1751 if (!current_euid())
1da177e4
LT		 1752 mode >>= 6;
1753 else if (in_egroup_p(0))
1754 mode >>= 3;
e6305c43 1755 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1756 return 0;
1757 return -EACCES;
1758}
1759
d7321cd6 1760int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1761{
1762 int error;
d7321cd6
PE		 1763 int mode;
1764
e6305c43 1765 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1766 if (error)
1767 return error;
d7321cd6
PE		 1768
1769 if (root->permissions)
1770 mode = root->permissions(root, current->nsproxy, table);
1771 else
1772 mode = table->mode;
1773
1774 return test_perm(mode, op);
1da177e4
LT		 1775}
1776
d912b0cc
EB		 1777static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1778{
1779 for (; table->ctl_name || table->procname; table++) {
1780 table->parent = parent;
1781 if (table->child)
1782 sysctl_set_parent(table, table->child);
1783 }
1784}
1785
1786static __init int sysctl_init(void)
1787{
1788 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1789#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1790 {
1791 int err;
1792 err = sysctl_check_table(current->nsproxy, root_table);
1793 }
1794#endif
d912b0cc
EB		 1795 return 0;
1796}
1797
1798core_initcall(sysctl_init);
1799
bfbcf034
AV		 1800static struct ctl_table *is_branch_in(struct ctl_table *branch,
1801 struct ctl_table *table)
ae7edecc
AV		 1802{
1803 struct ctl_table *p;
1804 const char *s = branch->procname;
1805
1806 /* branch should have named subdirectory as its first element */
1807 if (!s || !branch->child)
bfbcf034 1808 return NULL;
ae7edecc
AV		 1809
1810 /* ... and nothing else */
1811 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1812 return NULL;
ae7edecc
AV		 1813
1814 /* table should contain subdirectory with the same name */
1815 for (p = table; p->procname || p->ctl_name; p++) {
1816 if (!p->child)
1817 continue;
1818 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1819 return p;
ae7edecc 1820 }
bfbcf034 1821 return NULL;
ae7edecc
AV		 1822}
1823
1824/* see if attaching q to p would be an improvement */
1825static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1826{
1827 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1828 struct ctl_table *next;
ae7edecc
AV		 1829 int is_better = 0;
1830 int not_in_parent = !p->attached_by;
1831
bfbcf034 1832 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1833 if (by == q->attached_by)
1834 is_better = 1;
1835 if (to == p->attached_by)
1836 not_in_parent = 1;
1837 by = by->child;
bfbcf034 1838 to = next->child;
ae7edecc
AV		 1839 }
1840
1841 if (is_better && not_in_parent) {
1842 q->attached_by = by;
1843 q->attached_to = to;
1844 q->parent = p;
1845 }
1846}
1847
1da177e4 1848/**
e51b6ba0
EB		 1849 * __register_sysctl_paths - register a sysctl hierarchy
1850 * @root: List of sysctl headers to register on
1851 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1852 * @path: The path to the directory the sysctl table is in.
1da177e4 1853 * @table: the top-level table structure
1da177e4
LT		 1854 *
1855 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1856 * array. A completely 0 filled entry terminates the table.
1da177e4 1857 *
d8217f07 1858 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1859 *
1860 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1861 * must be unique within that level of sysctl
1862 *
1863 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1864 * enter a sysctl file
1865 *
1866 * data - a pointer to data for use by proc_handler
1867 *
1868 * maxlen - the maximum size in bytes of the data
1869 *
1870 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1871 *
1872 * child - a pointer to the child sysctl table if this entry is a directory, or
1873 * %NULL.
1874 *
1875 * proc_handler - the text handler routine (described below)
1876 *
1877 * strategy - the strategy routine (described below)
1878 *
1879 * de - for internal use by the sysctl routines
1880 *
1881 * extra1, extra2 - extra pointers usable by the proc handler routines
1882 *
1883 * Leaf nodes in the sysctl tree will be represented by a single file
1884 * under /proc; non-leaf nodes will be represented by directories.
1885 *
1886 * sysctl(2) can automatically manage read and write requests through
1887 * the sysctl table. The data and maxlen fields of the ctl_table
1888 * struct enable minimal validation of the values being written to be
1889 * performed, and the mode field allows minimal authentication.
1890 *
1891 * More sophisticated management can be enabled by the provision of a
1892 * strategy routine with the table entry. This will be called before
1893 * any automatic read or write of the data is performed.
1894 *
1895 * The strategy routine may return
1896 *
1897 * < 0 - Error occurred (error is passed to user process)
1898 *
1899 * 0 - OK - proceed with automatic read or write.
1900 *
1901 * > 0 - OK - read or write has been done by the strategy routine, so
1902 * return immediately.
1903 *
1904 * There must be a proc_handler routine for any terminal nodes
1905 * mirrored under /proc/sys (non-terminals are handled by a built-in
1906 * directory handler). Several default handlers are available to
1907 * cover common cases -
1908 *
1909 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1910 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1911 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1912 *
1913 * It is the handler's job to read the input buffer from user memory
1914 * and process it. The handler should return 0 on success.
1915 *
1916 * This routine returns %NULL on a failure to register, and a pointer
1917 * to the table header on success.
1918 */
e51b6ba0
EB		 1919struct ctl_table_header *__register_sysctl_paths(
1920 struct ctl_table_root *root,
1921 struct nsproxy *namespaces,
1922 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1923{
29e796fd
EB		 1924 struct ctl_table_header *header;
1925 struct ctl_table *new, **prevp;
1926 unsigned int n, npath;
ae7edecc 1927 struct ctl_table_set *set;
29e796fd
EB		 1928
1929 /* Count the path components */
1930 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1931 ;
1932
1933 /*
1934 * For each path component, allocate a 2-element ctl_table array.
1935 * The first array element will be filled with the sysctl entry
1936 * for this, the second will be the sentinel (ctl_name == 0).
1937 *
1938 * We allocate everything in one go so that we don't have to
1939 * worry about freeing additional memory in unregister_sysctl_table.
1940 */
1941 header = kzalloc(sizeof(struct ctl_table_header) +
1942 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1943 if (!header)
1da177e4 1944 return NULL;
29e796fd
EB		 1945
1946 new = (struct ctl_table *) (header + 1);
1947
1948 /* Now connect the dots */
1949 prevp = &header->ctl_table;
1950 for (n = 0; n < npath; ++n, ++path) {
1951 /* Copy the procname */
1952 new->procname = path->procname;
1953 new->ctl_name = path->ctl_name;
1954 new->mode = 0555;
1955
1956 *prevp = new;
1957 prevp = &new->child;
1958
1959 new += 2;
1960 }
1961 *prevp = table;
23eb06de 1962 header->ctl_table_arg = table;
29e796fd
EB		 1963
1964 INIT_LIST_HEAD(&header->ctl_entry);
1965 header->used = 0;
1966 header->unregistering = NULL;
e51b6ba0 1967 header->root = root;
29e796fd 1968 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1969 header->count = 1;
88f458e4 1970#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1971 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1972 kfree(header);
fc6cd25b
EB		 1973 return NULL;
1974 }
88f458e4 1975#endif
330d57fb 1976 spin_lock(&sysctl_lock);
73455092 1977 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 1978 header->attached_by = header->ctl_table;
1979 header->attached_to = root_table;
1980 header->parent = &root_table_header;
1981 for (set = header->set; set; set = set->parent) {
1982 struct ctl_table_header *p;
1983 list_for_each_entry(p, &set->list, ctl_entry) {
1984 if (p->unregistering)
1985 continue;
1986 try_attach(p, header);
1987 }
1988 }
1989 header->parent->count++;
73455092 1990 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 1991 spin_unlock(&sysctl_lock);
29e796fd
EB		 1992
1993 return header;
1994}
1995
e51b6ba0
EB		 1996/**
1997 * register_sysctl_table_path - register a sysctl table hierarchy
1998 * @path: The path to the directory the sysctl table is in.
1999 * @table: the top-level table structure
2000 *
2001 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2002 * array. A completely 0 filled entry terminates the table.
2003 *
2004 * See __register_sysctl_paths for more details.
2005 */
2006struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2007 struct ctl_table *table)
2008{
2009 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2010 path, table);
2011}
2012
29e796fd
EB		 2013/**
2014 * register_sysctl_table - register a sysctl table hierarchy
2015 * @table: the top-level table structure
2016 *
2017 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2018 * array. A completely 0 filled entry terminates the table.
2019 *
2020 * See register_sysctl_paths for more details.
2021 */
2022struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2023{
2024 static const struct ctl_path null_path[] = { {} };
2025
2026 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2027}
2028
2029/**
2030 * unregister_sysctl_table - unregister a sysctl table hierarchy
2031 * @header: the header returned from register_sysctl_table
2032 *
2033 * Unregisters the sysctl table and all children. proc entries may not
2034 * actually be removed until they are no longer used by anyone.
2035 */
2036void unregister_sysctl_table(struct ctl_table_header * header)
2037{
330d57fb 2038 might_sleep();
f1dad166
PE		 2039
2040 if (header == NULL)
2041 return;
2042
330d57fb
AV		 2043 spin_lock(&sysctl_lock);
2044 start_unregistering(header);
ae7edecc
AV		 2045 if (!--header->parent->count) {
2046 WARN_ON(1);
2047 kfree(header->parent);
2048 }
f7e6ced4
AV		 2049 if (!--header->count)
2050 kfree(header);
330d57fb 2051 spin_unlock(&sysctl_lock);
1da177e4
LT		 2052}
2053
9043476f
AV		 2054int sysctl_is_seen(struct ctl_table_header *p)
2055{
2056 struct ctl_table_set *set = p->set;
2057 int res;
2058 spin_lock(&sysctl_lock);
2059 if (p->unregistering)
2060 res = 0;
2061 else if (!set->is_seen)
2062 res = 1;
2063 else
2064 res = set->is_seen(set);
2065 spin_unlock(&sysctl_lock);
2066 return res;
2067}
2068
73455092
AV		 2069void setup_sysctl_set(struct ctl_table_set *p,
2070 struct ctl_table_set *parent,
2071 int (*is_seen)(struct ctl_table_set *))
2072{
2073 INIT_LIST_HEAD(&p->list);
2074 p->parent = parent ? parent : &sysctl_table_root.default_set;
2075 p->is_seen = is_seen;
2076}
2077
b89a8171 2078#else /* !CONFIG_SYSCTL */
d8217f07 2079struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2080{
2081 return NULL;
2082}
2083
29e796fd
EB		 2084struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2085 struct ctl_table *table)
2086{
2087 return NULL;
2088}
2089
b89a8171
EB		 2090void unregister_sysctl_table(struct ctl_table_header * table)
2091{
2092}
2093
73455092
AV		 2094void setup_sysctl_set(struct ctl_table_set *p,
2095 struct ctl_table_set *parent,
2096 int (*is_seen)(struct ctl_table_set *))
2097{
2098}
2099
f7e6ced4
AV		 2100void sysctl_head_put(struct ctl_table_header *head)
2101{
2102}
2103
b89a8171
EB		 2104#endif /* CONFIG_SYSCTL */
2105
1da177e4
LT		 2106/*
2107 * /proc/sys support
2108 */
2109
b89a8171 2110#ifdef CONFIG_PROC_SYSCTL
1da177e4 2111
b1ba4ddd
AB		 2112static int _proc_do_string(void* data, int maxlen, int write,
2113 struct file *filp, void __user *buffer,
2114 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2115{
2116 size_t len;
2117 char __user *p;
2118 char c;
8d060877
ON		 2119
2120 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2121 *lenp = 0;
2122 return 0;
2123 }
8d060877 2124
1da177e4
LT		 2125 if (write) {
2126 len = 0;
2127 p = buffer;
2128 while (len < *lenp) {
2129 if (get_user(c, p++))
2130 return -EFAULT;
2131 if (c == 0 || c == '\n')
2132 break;
2133 len++;
2134 }
f5dd3d6f
SV		 2135 if (len >= maxlen)
2136 len = maxlen-1;
2137 if(copy_from_user(data, buffer, len))
1da177e4 2138 return -EFAULT;
f5dd3d6f 2139 ((char *) data)[len] = 0;
1da177e4
LT		 2140 *ppos += *lenp;
2141 } else {
f5dd3d6f
SV		 2142 len = strlen(data);
2143 if (len > maxlen)
2144 len = maxlen;
8d060877
ON		 2145
2146 if (*ppos > len) {
2147 *lenp = 0;
2148 return 0;
2149 }
2150
2151 data += *ppos;
2152 len -= *ppos;
2153
1da177e4
LT		 2154 if (len > *lenp)
2155 len = *lenp;
2156 if (len)
f5dd3d6f 2157 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2158 return -EFAULT;
2159 if (len < *lenp) {
2160 if(put_user('\n', ((char __user *) buffer) + len))
2161 return -EFAULT;
2162 len++;
2163 }
2164 *lenp = len;
2165 *ppos += len;
2166 }
2167 return 0;
2168}
2169
f5dd3d6f
SV		 2170/**
2171 * proc_dostring - read a string sysctl
2172 * @table: the sysctl table
2173 * @write: %TRUE if this is a write to the sysctl file
2174 * @filp: the file structure
2175 * @buffer: the user buffer
2176 * @lenp: the size of the user buffer
2177 * @ppos: file position
2178 *
2179 * Reads/writes a string from/to the user buffer. If the kernel
2180 * buffer provided is not large enough to hold the string, the
2181 * string is truncated. The copied string is %NULL-terminated.
2182 * If the string is being read by the user process, it is copied
2183 * and a newline '\n' is added. It is truncated if the buffer is
2184 * not large enough.
2185 *
2186 * Returns 0 on success.
2187 */
d8217f07 2188int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2189 void __user *buffer, size_t *lenp, loff_t *ppos)
2190{
2191 return _proc_do_string(table->data, table->maxlen, write, filp,
2192 buffer, lenp, ppos);
2193}
2194
1da177e4
LT		 2195
2196static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2197 int *valp,
2198 int write, void *data)
2199{
2200 if (write) {
2201 *valp = *negp ? -*lvalp : *lvalp;
2202 } else {
2203 int val = *valp;
2204 if (val < 0) {
2205 *negp = -1;
2206 *lvalp = (unsigned long)-val;
2207 } else {
2208 *negp = 0;
2209 *lvalp = (unsigned long)val;
2210 }
2211 }
2212 return 0;
2213}
2214
d8217f07 2215static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2216 int write, struct file *filp, void __user *buffer,
2217 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2218 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2219 int write, void *data),
2220 void *data)
2221{
2222#define TMPBUFLEN 21
2223 int *i, vleft, first=1, neg, val;
2224 unsigned long lval;
2225 size_t left, len;
2226
2227 char buf[TMPBUFLEN], *p;
2228 char __user *s = buffer;
2229
fcfbd547 2230 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2231 (*ppos && !write)) {
2232 *lenp = 0;
2233 return 0;
2234 }
2235
fcfbd547 2236 i = (int *) tbl_data;
1da177e4
LT		 2237 vleft = table->maxlen / sizeof(*i);
2238 left = *lenp;
2239
2240 if (!conv)
2241 conv = do_proc_dointvec_conv;
2242
2243 for (; left && vleft--; i++, first=0) {
2244 if (write) {
2245 while (left) {
2246 char c;
2247 if (get_user(c, s))
2248 return -EFAULT;
2249 if (!isspace(c))
2250 break;
2251 left--;
2252 s++;
2253 }
2254 if (!left)
2255 break;
2256 neg = 0;
2257 len = left;
2258 if (len > sizeof(buf) - 1)
2259 len = sizeof(buf) - 1;
2260 if (copy_from_user(buf, s, len))
2261 return -EFAULT;
2262 buf[len] = 0;
2263 p = buf;
2264 if (*p == '-' && left > 1) {
2265 neg = 1;
bd9b0bac 2266 p++;
1da177e4
LT		 2267 }
2268 if (*p < '0' || *p > '9')
2269 break;
2270
2271 lval = simple_strtoul(p, &p, 0);
2272
2273 len = p-buf;
2274 if ((len < left) && *p && !isspace(*p))
2275 break;
2276 if (neg)
2277 val = -val;
2278 s += len;
2279 left -= len;
2280
2281 if (conv(&neg, &lval, i, 1, data))
2282 break;
2283 } else {
2284 p = buf;
2285 if (!first)
2286 *p++ = '\t';
2287
2288 if (conv(&neg, &lval, i, 0, data))
2289 break;
2290
2291 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2292 len = strlen(buf);
2293 if (len > left)
2294 len = left;
2295 if(copy_to_user(s, buf, len))
2296 return -EFAULT;
2297 left -= len;
2298 s += len;
2299 }
2300 }
2301
2302 if (!write && !first && left) {
2303 if(put_user('\n', s))
2304 return -EFAULT;
2305 left--, s++;
2306 }
2307 if (write) {
2308 while (left) {
2309 char c;
2310 if (get_user(c, s++))
2311 return -EFAULT;
2312 if (!isspace(c))
2313 break;
2314 left--;
2315 }
2316 }
2317 if (write && first)
2318 return -EINVAL;
2319 *lenp -= left;
2320 *ppos += *lenp;
2321 return 0;
2322#undef TMPBUFLEN
2323}
2324
d8217f07 2325static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2326 void __user *buffer, size_t *lenp, loff_t *ppos,
2327 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2328 int write, void *data),
2329 void *data)
2330{
2331 return __do_proc_dointvec(table->data, table, write, filp,
2332 buffer, lenp, ppos, conv, data);
2333}
2334
1da177e4
LT		 2335/**
2336 * proc_dointvec - read a vector of integers
2337 * @table: the sysctl table
2338 * @write: %TRUE if this is a write to the sysctl file
2339 * @filp: the file structure
2340 * @buffer: the user buffer
2341 * @lenp: the size of the user buffer
2342 * @ppos: file position
2343 *
2344 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2345 * values from/to the user buffer, treated as an ASCII string.
2346 *
2347 * Returns 0 on success.
2348 */
d8217f07 2349int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2350 void __user *buffer, size_t *lenp, loff_t *ppos)
2351{
2352 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2353 NULL,NULL);
2354}
2355
34f5a398 2356/*
25ddbb18
AK		 2357 * Taint values can only be increased
2358 * This means we can safely use a temporary.
34f5a398 2359 */
25ddbb18 2360static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2361 void __user *buffer, size_t *lenp, loff_t *ppos)
2362{
25ddbb18
AK		 2363 struct ctl_table t;
2364 unsigned long tmptaint = get_taint();
2365 int err;
34f5a398 2366
91fcd412 2367 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2368 return -EPERM;
2369
25ddbb18
AK		 2370 t = *table;
2371 t.data = &tmptaint;
2372 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2373 if (err < 0)
2374 return err;
2375
2376 if (write) {
2377 /*
2378 * Poor man's atomic or. Not worth adding a primitive
2379 * to everyone's atomic.h for this
2380 */
2381 int i;
2382 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2383 if ((tmptaint >> i) & 1)
2384 add_taint(i);
2385 }
2386 }
2387
2388 return err;
34f5a398
TT		 2389}
2390
1da177e4
LT		 2391struct do_proc_dointvec_minmax_conv_param {
2392 int *min;
2393 int *max;
2394};
2395
2396static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2397 int *valp,
2398 int write, void *data)
2399{
2400 struct do_proc_dointvec_minmax_conv_param *param = data;
2401 if (write) {
2402 int val = *negp ? -*lvalp : *lvalp;
2403 if ((param->min && *param->min > val) ||
2404 (param->max && *param->max < val))
2405 return -EINVAL;
2406 *valp = val;
2407 } else {
2408 int val = *valp;
2409 if (val < 0) {
2410 *negp = -1;
2411 *lvalp = (unsigned long)-val;
2412 } else {
2413 *negp = 0;
2414 *lvalp = (unsigned long)val;
2415 }
2416 }
2417 return 0;
2418}
2419
2420/**
2421 * proc_dointvec_minmax - read a vector of integers with min/max values
2422 * @table: the sysctl table
2423 * @write: %TRUE if this is a write to the sysctl file
2424 * @filp: the file structure
2425 * @buffer: the user buffer
2426 * @lenp: the size of the user buffer
2427 * @ppos: file position
2428 *
2429 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2430 * values from/to the user buffer, treated as an ASCII string.
2431 *
2432 * This routine will ensure the values are within the range specified by
2433 * table->extra1 (min) and table->extra2 (max).
2434 *
2435 * Returns 0 on success.
2436 */
d8217f07 2437int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2438 void __user *buffer, size_t *lenp, loff_t *ppos)
2439{
2440 struct do_proc_dointvec_minmax_conv_param param = {
2441 .min = (int *) table->extra1,
2442 .max = (int *) table->extra2,
2443 };
2444 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2445 do_proc_dointvec_minmax_conv, &param);
2446}
2447
d8217f07 2448static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2449 struct file *filp,
2450 void __user *buffer,
2451 size_t *lenp, loff_t *ppos,
2452 unsigned long convmul,
2453 unsigned long convdiv)
2454{
2455#define TMPBUFLEN 21
2456 unsigned long *i, *min, *max, val;
2457 int vleft, first=1, neg;
2458 size_t len, left;
2459 char buf[TMPBUFLEN], *p;
2460 char __user *s = buffer;
2461
fcfbd547 2462 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2463 (*ppos && !write)) {
2464 *lenp = 0;
2465 return 0;
2466 }
2467
fcfbd547 2468 i = (unsigned long *) data;
1da177e4
LT		 2469 min = (unsigned long *) table->extra1;
2470 max = (unsigned long *) table->extra2;
2471 vleft = table->maxlen / sizeof(unsigned long);
2472 left = *lenp;
2473
2474 for (; left && vleft--; i++, min++, max++, first=0) {
2475 if (write) {
2476 while (left) {
2477 char c;
2478 if (get_user(c, s))
2479 return -EFAULT;
2480 if (!isspace(c))
2481 break;
2482 left--;
2483 s++;
2484 }
2485 if (!left)
2486 break;
2487 neg = 0;
2488 len = left;
2489 if (len > TMPBUFLEN-1)
2490 len = TMPBUFLEN-1;
2491 if (copy_from_user(buf, s, len))
2492 return -EFAULT;
2493 buf[len] = 0;
2494 p = buf;
2495 if (*p == '-' && left > 1) {
2496 neg = 1;
bd9b0bac 2497 p++;
1da177e4
LT		 2498 }
2499 if (*p < '0' || *p > '9')
2500 break;
2501 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2502 len = p-buf;
2503 if ((len < left) && *p && !isspace(*p))
2504 break;
2505 if (neg)
2506 val = -val;
2507 s += len;
2508 left -= len;
2509
2510 if(neg)
2511 continue;
2512 if ((min && val < *min) || (max && val > *max))
2513 continue;
2514 *i = val;
2515 } else {
2516 p = buf;
2517 if (!first)
2518 *p++ = '\t';
2519 sprintf(p, "%lu", convdiv * (*i) / convmul);
2520 len = strlen(buf);
2521 if (len > left)
2522 len = left;
2523 if(copy_to_user(s, buf, len))
2524 return -EFAULT;
2525 left -= len;
2526 s += len;
2527 }
2528 }
2529
2530 if (!write && !first && left) {
2531 if(put_user('\n', s))
2532 return -EFAULT;
2533 left--, s++;
2534 }
2535 if (write) {
2536 while (left) {
2537 char c;
2538 if (get_user(c, s++))
2539 return -EFAULT;
2540 if (!isspace(c))
2541 break;
2542 left--;
2543 }
2544 }
2545 if (write && first)
2546 return -EINVAL;
2547 *lenp -= left;
2548 *ppos += *lenp;
2549 return 0;
2550#undef TMPBUFLEN
2551}
2552
d8217f07 2553static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2554 struct file *filp,
2555 void __user *buffer,
2556 size_t *lenp, loff_t *ppos,
2557 unsigned long convmul,
2558 unsigned long convdiv)
2559{
2560 return __do_proc_doulongvec_minmax(table->data, table, write,
2561 filp, buffer, lenp, ppos, convmul, convdiv);
2562}
2563
1da177e4
LT		 2564/**
2565 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2566 * @table: the sysctl table
2567 * @write: %TRUE if this is a write to the sysctl file
2568 * @filp: the file structure
2569 * @buffer: the user buffer
2570 * @lenp: the size of the user buffer
2571 * @ppos: file position
2572 *
2573 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2574 * values from/to the user buffer, treated as an ASCII string.
2575 *
2576 * This routine will ensure the values are within the range specified by
2577 * table->extra1 (min) and table->extra2 (max).
2578 *
2579 * Returns 0 on success.
2580 */
d8217f07 2581int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2582 void __user *buffer, size_t *lenp, loff_t *ppos)
2583{
2584 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2585}
2586
2587/**
2588 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2589 * @table: the sysctl table
2590 * @write: %TRUE if this is a write to the sysctl file
2591 * @filp: the file structure
2592 * @buffer: the user buffer
2593 * @lenp: the size of the user buffer
2594 * @ppos: file position
2595 *
2596 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2597 * values from/to the user buffer, treated as an ASCII string. The values
2598 * are treated as milliseconds, and converted to jiffies when they are stored.
2599 *
2600 * This routine will ensure the values are within the range specified by
2601 * table->extra1 (min) and table->extra2 (max).
2602 *
2603 * Returns 0 on success.
2604 */
d8217f07 2605int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2606 struct file *filp,
2607 void __user *buffer,
2608 size_t *lenp, loff_t *ppos)
2609{
2610 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2611 lenp, ppos, HZ, 1000l);
2612}
2613
2614
2615static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2616 int *valp,
2617 int write, void *data)
2618{
2619 if (write) {
cba9f33d
BS		 2620 if (*lvalp > LONG_MAX / HZ)
2621 return 1;
1da177e4
LT		 2622 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2623 } else {
2624 int val = *valp;
2625 unsigned long lval;
2626 if (val < 0) {
2627 *negp = -1;
2628 lval = (unsigned long)-val;
2629 } else {
2630 *negp = 0;
2631 lval = (unsigned long)val;
2632 }
2633 *lvalp = lval / HZ;
2634 }
2635 return 0;
2636}
2637
2638static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2639 int *valp,
2640 int write, void *data)
2641{
2642 if (write) {
cba9f33d
BS		 2643 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2644 return 1;
1da177e4
LT		 2645 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2646 } else {
2647 int val = *valp;
2648 unsigned long lval;
2649 if (val < 0) {
2650 *negp = -1;
2651 lval = (unsigned long)-val;
2652 } else {
2653 *negp = 0;
2654 lval = (unsigned long)val;
2655 }
2656 *lvalp = jiffies_to_clock_t(lval);
2657 }
2658 return 0;
2659}
2660
2661static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2662 int *valp,
2663 int write, void *data)
2664{
2665 if (write) {
2666 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2667 } else {
2668 int val = *valp;
2669 unsigned long lval;
2670 if (val < 0) {
2671 *negp = -1;
2672 lval = (unsigned long)-val;
2673 } else {
2674 *negp = 0;
2675 lval = (unsigned long)val;
2676 }
2677 *lvalp = jiffies_to_msecs(lval);
2678 }
2679 return 0;
2680}
2681
2682/**
2683 * proc_dointvec_jiffies - read a vector of integers as seconds
2684 * @table: the sysctl table
2685 * @write: %TRUE if this is a write to the sysctl file
2686 * @filp: the file structure
2687 * @buffer: the user buffer
2688 * @lenp: the size of the user buffer
2689 * @ppos: file position
2690 *
2691 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2692 * values from/to the user buffer, treated as an ASCII string.
2693 * The values read are assumed to be in seconds, and are converted into
2694 * jiffies.
2695 *
2696 * Returns 0 on success.
2697 */
d8217f07 2698int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2699 void __user *buffer, size_t *lenp, loff_t *ppos)
2700{
2701 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2702 do_proc_dointvec_jiffies_conv,NULL);
2703}
2704
2705/**
2706 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2707 * @table: the sysctl table
2708 * @write: %TRUE if this is a write to the sysctl file
2709 * @filp: the file structure
2710 * @buffer: the user buffer
2711 * @lenp: the size of the user buffer
1e5d5331 2712 * @ppos: pointer to the file position
1da177e4
LT		 2713 *
2714 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2715 * values from/to the user buffer, treated as an ASCII string.
2716 * The values read are assumed to be in 1/USER_HZ seconds, and
2717 * are converted into jiffies.
2718 *
2719 * Returns 0 on success.
2720 */
d8217f07 2721int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2722 void __user *buffer, size_t *lenp, loff_t *ppos)
2723{
2724 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2725 do_proc_dointvec_userhz_jiffies_conv,NULL);
2726}
2727
2728/**
2729 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2730 * @table: the sysctl table
2731 * @write: %TRUE if this is a write to the sysctl file
2732 * @filp: the file structure
2733 * @buffer: the user buffer
2734 * @lenp: the size of the user buffer
67be2dd1
MW		 2735 * @ppos: file position
2736 * @ppos: the current position in the file
1da177e4
LT		 2737 *
2738 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2739 * values from/to the user buffer, treated as an ASCII string.
2740 * The values read are assumed to be in 1/1000 seconds, and
2741 * are converted into jiffies.
2742 *
2743 * Returns 0 on success.
2744 */
d8217f07 2745int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2746 void __user *buffer, size_t *lenp, loff_t *ppos)
2747{
2748 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2749 do_proc_dointvec_ms_jiffies_conv, NULL);
2750}
2751
d8217f07 2752static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2753 void __user *buffer, size_t *lenp, loff_t *ppos)
2754{
2755 struct pid *new_pid;
2756 pid_t tmp;
2757 int r;
2758
6c5f3e7b 2759 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2760
2761 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2762 lenp, ppos, NULL, NULL);
2763 if (r || !write)
2764 return r;
2765
2766 new_pid = find_get_pid(tmp);
2767 if (!new_pid)
2768 return -ESRCH;
2769
2770 put_pid(xchg(&cad_pid, new_pid));
2771 return 0;
2772}
2773
1da177e4
LT		 2774#else /* CONFIG_PROC_FS */
2775
d8217f07 2776int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2777 void __user *buffer, size_t *lenp, loff_t *ppos)
2778{
2779 return -ENOSYS;
2780}
2781
d8217f07 2782int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2783 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2784{
2785 return -ENOSYS;
2786}
2787
d8217f07 2788int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2789 void __user *buffer, size_t *lenp, loff_t *ppos)
2790{
2791 return -ENOSYS;
2792}
2793
d8217f07 2794int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2795 void __user *buffer, size_t *lenp, loff_t *ppos)
2796{
2797 return -ENOSYS;
2798}
2799
d8217f07 2800int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2801 void __user *buffer, size_t *lenp, loff_t *ppos)
2802{
2803 return -ENOSYS;
2804}
2805
d8217f07 2806int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2807 void __user *buffer, size_t *lenp, loff_t *ppos)
2808{
2809 return -ENOSYS;
2810}
2811
d8217f07 2812int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2813 void __user *buffer, size_t *lenp, loff_t *ppos)
2814{
2815 return -ENOSYS;
2816}
2817
d8217f07 2818int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2819 struct file *filp,
2820 void __user *buffer,
2821 size_t *lenp, loff_t *ppos)
2822{
2823 return -ENOSYS;
2824}
2825
2826
2827#endif /* CONFIG_PROC_FS */
2828
2829
b89a8171 2830#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2831/*
2832 * General sysctl support routines
2833 */
2834
49a0c458 2835/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2836int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2837 void __user *oldval, size_t __user *oldlenp,
2838 void __user *newval, size_t newlen)
2839{
2840 size_t len;
2841
2842 /* Get out of I don't have a variable */
2843 if (!table->data || !table->maxlen)
2844 return -ENOTDIR;
2845
2846 if (oldval && oldlenp) {
2847 if (get_user(len, oldlenp))
2848 return -EFAULT;
2849 if (len) {
2850 if (len > table->maxlen)
2851 len = table->maxlen;
2852 if (copy_to_user(oldval, table->data, len))
2853 return -EFAULT;
2854 if (put_user(len, oldlenp))
2855 return -EFAULT;
2856 }
2857 }
2858
2859 if (newval && newlen) {
2860 if (newlen > table->maxlen)
2861 newlen = table->maxlen;
2862
2863 if (copy_from_user(table->data, newval, newlen))
2864 return -EFAULT;
2865 }
2866 return 1;
2867}
2868
1da177e4 2869/* The generic string strategy routine: */
f221e726 2870int sysctl_string(struct ctl_table *table,
1da177e4 2871 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2872 void __user *newval, size_t newlen)
1da177e4 2873{
1da177e4
LT		 2874 if (!table->data || !table->maxlen)
2875 return -ENOTDIR;
2876
2877 if (oldval && oldlenp) {
de9e007d
LT		 2878 size_t bufsize;
2879 if (get_user(bufsize, oldlenp))
1da177e4 2880 return -EFAULT;
de9e007d
LT		 2881 if (bufsize) {
2882 size_t len = strlen(table->data), copied;
2883
2884 /* This shouldn't trigger for a well-formed sysctl */
2885 if (len > table->maxlen)
1da177e4 2886 len = table->maxlen;
de9e007d
LT		 2887
2888 /* Copy up to a max of bufsize-1 bytes of the string */
2889 copied = (len >= bufsize) ? bufsize - 1 : len;
2890
2891 if (copy_to_user(oldval, table->data, copied) ||
2892 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2893 return -EFAULT;
de9e007d 2894 if (put_user(len, oldlenp))
1da177e4
LT		 2895 return -EFAULT;
2896 }
2897 }
2898 if (newval && newlen) {
de9e007d 2899 size_t len = newlen;
1da177e4
LT		 2900 if (len > table->maxlen)
2901 len = table->maxlen;
2902 if(copy_from_user(table->data, newval, len))
2903 return -EFAULT;
2904 if (len == table->maxlen)
2905 len--;
2906 ((char *) table->data)[len] = 0;
2907 }
82c9df82 2908 return 1;
1da177e4
LT		 2909}
2910
2911/*
2912 * This function makes sure that all of the integers in the vector
2913 * are between the minimum and maximum values given in the arrays
2914 * table->extra1 and table->extra2, respectively.
2915 */
f221e726 2916int sysctl_intvec(struct ctl_table *table,
1da177e4 2917 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2918 void __user *newval, size_t newlen)
1da177e4
LT		 2919{
2920
2921 if (newval && newlen) {
2922 int __user *vec = (int __user *) newval;
2923 int *min = (int *) table->extra1;
2924 int *max = (int *) table->extra2;
2925 size_t length;
2926 int i;
2927
2928 if (newlen % sizeof(int) != 0)
2929 return -EINVAL;
2930
2931 if (!table->extra1 && !table->extra2)
2932 return 0;
2933
2934 if (newlen > table->maxlen)
2935 newlen = table->maxlen;
2936 length = newlen / sizeof(int);
2937
2938 for (i = 0; i < length; i++) {
2939 int value;
2940 if (get_user(value, vec + i))
2941 return -EFAULT;
2942 if (min && value < min[i])
2943 return -EINVAL;
2944 if (max && value > max[i])
2945 return -EINVAL;
2946 }
2947 }
2948 return 0;
2949}
2950
2951/* Strategy function to convert jiffies to seconds */
f221e726 2952int sysctl_jiffies(struct ctl_table *table,
1da177e4 2953 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2954 void __user *newval, size_t newlen)
1da177e4 2955{
3ee75ac3 2956 if (oldval && oldlenp) {
1da177e4 2957 size_t olen;
3ee75ac3
AD		 2958
2959 if (get_user(olen, oldlenp))
2960 return -EFAULT;
2961 if (olen) {
2962 int val;
2963
2964 if (olen < sizeof(int))
2965 return -EINVAL;
2966
2967 val = *(int *)(table->data) / HZ;
2968 if (put_user(val, (int __user *)oldval))
2969 return -EFAULT;
2970 if (put_user(sizeof(int), oldlenp))
1da177e4 2971 return -EFAULT;
1da177e4 2972 }
1da177e4
LT		 2973 }
2974 if (newval && newlen) {
2975 int new;
2976 if (newlen != sizeof(int))
2977 return -EINVAL;
2978 if (get_user(new, (int __user *)newval))
2979 return -EFAULT;
2980 *(int *)(table->data) = new*HZ;
2981 }
2982 return 1;
2983}
2984
2985/* Strategy function to convert jiffies to seconds */
f221e726 2986int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 2987 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2988 void __user *newval, size_t newlen)
1da177e4 2989{
3ee75ac3 2990 if (oldval && oldlenp) {
1da177e4 2991 size_t olen;
3ee75ac3
AD		 2992
2993 if (get_user(olen, oldlenp))
2994 return -EFAULT;
2995 if (olen) {
2996 int val;
2997
2998 if (olen < sizeof(int))
2999 return -EINVAL;
3000
3001 val = jiffies_to_msecs(*(int *)(table->data));
3002 if (put_user(val, (int __user *)oldval))
3003 return -EFAULT;
3004 if (put_user(sizeof(int), oldlenp))
1da177e4 3005 return -EFAULT;
1da177e4 3006 }
1da177e4
LT		 3007 }
3008 if (newval && newlen) {
3009 int new;
3010 if (newlen != sizeof(int))
3011 return -EINVAL;
3012 if (get_user(new, (int __user *)newval))
3013 return -EFAULT;
3014 *(int *)(table->data) = msecs_to_jiffies(new);
3015 }
3016 return 1;
3017}
3018
c4b8b769 3019
c4b8b769 3020
b89a8171 3021#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3022
3023
1e7bfb21 3024SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3025{
0e009be8 3026 struct __sysctl_args tmp;
7058cb02 3027 int error;
0e009be8 3028
0e009be8
EB		 3029 if (copy_from_user(&tmp, args, sizeof(tmp)))
3030 return -EFAULT;
0e009be8 3031
7058cb02 3032 error = deprecated_sysctl_warning(&tmp);
b89a8171 3033
7058cb02
EB		 3034 /* If no error reading the parameters then just -ENOSYS ... */
3035 if (!error)
3036 error = -ENOSYS;
3037
3038 return error;
1da177e4
LT		 3039}
3040
f221e726 3041int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3042 void __user *oldval, size_t __user *oldlenp,
3043 void __user *newval, size_t newlen)
3044{
3045 return -ENOSYS;
3046}
3047
f221e726 3048int sysctl_string(struct ctl_table *table,
1da177e4 3049 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3050 void __user *newval, size_t newlen)
1da177e4
LT		 3051{
3052 return -ENOSYS;
3053}
3054
f221e726 3055int sysctl_intvec(struct ctl_table *table,
1da177e4 3056 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3057 void __user *newval, size_t newlen)
1da177e4
LT		 3058{
3059 return -ENOSYS;
3060}
3061
f221e726 3062int sysctl_jiffies(struct ctl_table *table,
1da177e4 3063 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3064 void __user *newval, size_t newlen)
1da177e4
LT		 3065{
3066 return -ENOSYS;
3067}
3068
f221e726 3069int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3070 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3071 void __user *newval, size_t newlen)
1da177e4
LT		 3072{
3073 return -ENOSYS;
3074}
3075
b89a8171 3076#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3077
7058cb02
EB		 3078static int deprecated_sysctl_warning(struct __sysctl_args *args)
3079{
3080 static int msg_count;
3081 int name[CTL_MAXNAME];
3082 int i;
3083
6fc48af8
TH		 3084 /* Check args->nlen. */
3085 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3086 return -ENOTDIR;
3087
7058cb02
EB		 3088 /* Read in the sysctl name for better debug message logging */
3089 for (i = 0; i < args->nlen; i++)
3090 if (get_user(name[i], args->name + i))
3091 return -EFAULT;
3092
3093 /* Ignore accesses to kernel.version */
3094 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3095 return 0;
3096
3097 if (msg_count < 5) {
3098 msg_count++;
3099 printk(KERN_INFO
3100 "warning: process `%s' used the deprecated sysctl "
3101 "system call with ", current->comm);
3102 for (i = 0; i < args->nlen; i++)
3103 printk("%d.", name[i]);
3104 printk("\n");
3105 }
3106 return 0;
3107}
3108
1da177e4
LT		 3109/*
3110 * No sense putting this after each symbol definition, twice,
3111 * exception granted :-)
3112 */
3113EXPORT_SYMBOL(proc_dointvec);
3114EXPORT_SYMBOL(proc_dointvec_jiffies);
3115EXPORT_SYMBOL(proc_dointvec_minmax);
3116EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3117EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3118EXPORT_SYMBOL(proc_dostring);
3119EXPORT_SYMBOL(proc_doulongvec_minmax);
3120EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3121EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3122EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3123EXPORT_SYMBOL(sysctl_intvec);
3124EXPORT_SYMBOL(sysctl_jiffies);
3125EXPORT_SYMBOL(sysctl_ms_jiffies);
3126EXPORT_SYMBOL(sysctl_string);
49a0c458 3127EXPORT_SYMBOL(sysctl_data);
1da177e4 3128EXPORT_SYMBOL(unregister_sysctl_table);
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