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Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.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>
1da177e4
LT		 51
52#include <asm/uaccess.h>
53#include <asm/processor.h>
54
29cbc78b
AK		 55#ifdef CONFIG_X86
56#include <asm/nmi.h>
0741f4d2 57#include <asm/stacktrace.h>
6e7c4025 58#include <asm/io.h>
29cbc78b
AK		 59#endif
60
7058cb02
EB		 61static int deprecated_sysctl_warning(struct __sysctl_args *args);
62
1da177e4
LT		 63#if defined(CONFIG_SYSCTL)
64
65/* External variables not in a header file. */
66extern int C_A_D;
45807a1d 67extern int print_fatal_signals;
1da177e4
LT		 68extern int sysctl_overcommit_memory;
69extern int sysctl_overcommit_ratio;
fadd8fbd 70extern int sysctl_panic_on_oom;
fe071d7e 71extern int sysctl_oom_kill_allocating_task;
fef1bdd6 72extern int sysctl_oom_dump_tasks;
1da177e4 73extern int max_threads;
1da177e4 74extern int core_uses_pid;
d6e71144 75extern int suid_dumpable;
1da177e4 76extern char core_pattern[];
1da177e4
LT		 77extern int pid_max;
78extern int min_free_kbytes;
1da177e4 79extern int pid_max_min, pid_max_max;
9d0243bc 80extern int sysctl_drop_caches;
8ad4b1fb 81extern int percpu_pagelist_fraction;
bebfa101 82extern int compat_log;
9745512c 83extern int latencytop_enabled;
eceea0b3 84extern int sysctl_nr_open_min, sysctl_nr_open_max;
31a72bce
PM		 85#ifdef CONFIG_RCU_TORTURE_TEST
86extern int rcutorture_runnable;
87#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 88
c4f3b63f 89/* Constants used for minimum and maximum */
1c4cd6dd 90#if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
c4f3b63f 91static int one = 1;
195cf453
BG		 92#endif
93
94#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 95static int sixty = 60;
9383d967 96static int neg_one = -1;
c4f3b63f
RT		 97#endif
98
bfcd17a6 99#if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
c4f3b63f
RT		 100static int two = 2;
101#endif
102
103static int zero;
104static int one_hundred = 100;
105
1da177e4
LT		 106/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
107static int maxolduid = 65535;
108static int minolduid;
8ad4b1fb 109static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 110
111static int ngroups_max = NGROUPS_MAX;
112
a1ef5adb 113#ifdef CONFIG_MODULES
1da177e4
LT		 114extern char modprobe_path[];
115#endif
1da177e4
LT		 116#ifdef CONFIG_CHR_DEV_SG
117extern int sg_big_buff;
118#endif
1da177e4 119
72c57ed5 120#ifdef CONFIG_SPARC
17f04fbb 121#include <asm/system.h>
1da177e4
LT		 122#endif
123
124#ifdef __hppa__
125extern int pwrsw_enabled;
126extern int unaligned_enabled;
127#endif
128
347a8dc3 129#ifdef CONFIG_S390
1da177e4
LT		 130#ifdef CONFIG_MATHEMU
131extern int sysctl_ieee_emulation_warnings;
132#endif
133extern int sysctl_userprocess_debug;
951f22d5 134extern int spin_retry;
1da177e4
LT		 135#endif
136
1da177e4
LT		 137#ifdef CONFIG_BSD_PROCESS_ACCT
138extern int acct_parm[];
139#endif
140
d2b176ed
JS		 141#ifdef CONFIG_IA64
142extern int no_unaligned_warning;
143#endif
144
23f78d4a
IM		 145#ifdef CONFIG_RT_MUTEXES
146extern int max_lock_depth;
147#endif
148
d6f8ff73 149#ifdef CONFIG_PROC_SYSCTL
d8217f07 150static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 151 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 152static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 153 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 154#endif
9ec52099 155
d8217f07 156static struct ctl_table root_table[];
e51b6ba0
EB		 157static struct ctl_table_root sysctl_table_root;
158static struct ctl_table_header root_table_header = {
b380b0d4 159 .count = 1,
e51b6ba0 160 .ctl_table = root_table,
73455092 161 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 162 .root = &sysctl_table_root,
73455092 163 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 164};
165static struct ctl_table_root sysctl_table_root = {
166 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 167 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 168};
1da177e4 169
d8217f07
EB		 170static struct ctl_table kern_table[];
171static struct ctl_table vm_table[];
172static struct ctl_table fs_table[];
173static struct ctl_table debug_table[];
174static struct ctl_table dev_table[];
175extern struct ctl_table random_table[];
2d9048e2 176#ifdef CONFIG_INOTIFY_USER
d8217f07 177extern struct ctl_table inotify_table[];
0399cb08 178#endif
7ef9964e
DL		 179#ifdef CONFIG_EPOLL
180extern struct ctl_table epoll_table[];
181#endif
1da177e4
LT		 182
183#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
184int sysctl_legacy_va_layout;
185#endif
186
f20786ff
PZ		 187extern int prove_locking;
188extern int lock_stat;
9bc9a6bd 189
1da177e4
LT		 190/* The default sysctl tables: */
191
d8217f07 192static struct ctl_table root_table[] = {
1da177e4
LT		 193 {
194 .ctl_name = CTL_KERN,
195 .procname = "kernel",
196 .mode = 0555,
197 .child = kern_table,
198 },
199 {
200 .ctl_name = CTL_VM,
201 .procname = "vm",
202 .mode = 0555,
203 .child = vm_table,
204 },
1da177e4
LT		 205 {
206 .ctl_name = CTL_FS,
207 .procname = "fs",
208 .mode = 0555,
209 .child = fs_table,
210 },
211 {
212 .ctl_name = CTL_DEBUG,
213 .procname = "debug",
214 .mode = 0555,
215 .child = debug_table,
216 },
217 {
218 .ctl_name = CTL_DEV,
219 .procname = "dev",
220 .mode = 0555,
221 .child = dev_table,
222 },
2be7fe07
AM		 223/*
224 * NOTE: do not add new entries to this table unless you have read
225 * Documentation/sysctl/ctl_unnumbered.txt
226 */
1da177e4
LT		 227 { .ctl_name = 0 }
228};
229
77e54a1f 230#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 231static int min_sched_granularity_ns = 100000; /* 100 usecs */
232static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
233static int min_wakeup_granularity_ns; /* 0 usecs */
234static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 235#endif
236
d8217f07 237static struct ctl_table kern_table[] = {
77e54a1f
IM		 238#ifdef CONFIG_SCHED_DEBUG
239 {
240 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 241 .procname = "sched_min_granularity_ns",
242 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 243 .maxlen = sizeof(unsigned int),
244 .mode = 0644,
b2be5e96
PZ		 245 .proc_handler = &sched_nr_latency_handler,
246 .strategy = &sysctl_intvec,
247 .extra1 = &min_sched_granularity_ns,
248 .extra2 = &max_sched_granularity_ns,
77e54a1f 249 },
21805085
PZ		 250 {
251 .ctl_name = CTL_UNNUMBERED,
252 .procname = "sched_latency_ns",
253 .data = &sysctl_sched_latency,
254 .maxlen = sizeof(unsigned int),
255 .mode = 0644,
b2be5e96 256 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 257 .strategy = &sysctl_intvec,
258 .extra1 = &min_sched_granularity_ns,
259 .extra2 = &max_sched_granularity_ns,
260 },
77e54a1f
IM		 261 {
262 .ctl_name = CTL_UNNUMBERED,
263 .procname = "sched_wakeup_granularity_ns",
264 .data = &sysctl_sched_wakeup_granularity,
265 .maxlen = sizeof(unsigned int),
266 .mode = 0644,
267 .proc_handler = &proc_dointvec_minmax,
268 .strategy = &sysctl_intvec,
77e54a1f
IM		 269 .extra1 = &min_wakeup_granularity_ns,
270 .extra2 = &max_wakeup_granularity_ns,
271 },
2398f2c6
PZ		 272 {
273 .ctl_name = CTL_UNNUMBERED,
274 .procname = "sched_shares_ratelimit",
275 .data = &sysctl_sched_shares_ratelimit,
276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
278 .proc_handler = &proc_dointvec,
279 },
ffda12a1
PZ		 280 {
281 .ctl_name = CTL_UNNUMBERED,
282 .procname = "sched_shares_thresh",
283 .data = &sysctl_sched_shares_thresh,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = &proc_dointvec_minmax,
287 .strategy = &sysctl_intvec,
288 .extra1 = &zero,
289 },
77e54a1f
IM		 290 {
291 .ctl_name = CTL_UNNUMBERED,
292 .procname = "sched_child_runs_first",
293 .data = &sysctl_sched_child_runs_first,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
296 .proc_handler = &proc_dointvec,
297 },
1fc84aaa
PZ		 298 {
299 .ctl_name = CTL_UNNUMBERED,
300 .procname = "sched_features",
301 .data = &sysctl_sched_features,
302 .maxlen = sizeof(unsigned int),
303 .mode = 0644,
304 .proc_handler = &proc_dointvec,
305 },
da84d961
IM		 306 {
307 .ctl_name = CTL_UNNUMBERED,
308 .procname = "sched_migration_cost",
309 .data = &sysctl_sched_migration_cost,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = &proc_dointvec,
313 },
b82d9fdd
PZ		 314 {
315 .ctl_name = CTL_UNNUMBERED,
316 .procname = "sched_nr_migrate",
317 .data = &sysctl_sched_nr_migrate,
318 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 319 .mode = 0644,
320 .proc_handler = &proc_dointvec,
321 },
1fc84aaa 322#endif
9f0c1e56
PZ		 323 {
324 .ctl_name = CTL_UNNUMBERED,
325 .procname = "sched_rt_period_us",
326 .data = &sysctl_sched_rt_period,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
d0b27fa7 329 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 330 },
331 {
332 .ctl_name = CTL_UNNUMBERED,
333 .procname = "sched_rt_runtime_us",
334 .data = &sysctl_sched_rt_runtime,
335 .maxlen = sizeof(int),
336 .mode = 0644,
d0b27fa7 337 .proc_handler = &sched_rt_handler,
9f0c1e56 338 },
1799e35d
IM		 339 {
340 .ctl_name = CTL_UNNUMBERED,
341 .procname = "sched_compat_yield",
342 .data = &sysctl_sched_compat_yield,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = &proc_dointvec,
346 },
f20786ff
PZ		 347#ifdef CONFIG_PROVE_LOCKING
348 {
349 .ctl_name = CTL_UNNUMBERED,
350 .procname = "prove_locking",
351 .data = &prove_locking,
352 .maxlen = sizeof(int),
353 .mode = 0644,
354 .proc_handler = &proc_dointvec,
355 },
356#endif
357#ifdef CONFIG_LOCK_STAT
358 {
359 .ctl_name = CTL_UNNUMBERED,
360 .procname = "lock_stat",
361 .data = &lock_stat,
362 .maxlen = sizeof(int),
363 .mode = 0644,
364 .proc_handler = &proc_dointvec,
365 },
77e54a1f 366#endif
1da177e4
LT		 367 {
368 .ctl_name = KERN_PANIC,
369 .procname = "panic",
370 .data = &panic_timeout,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = &proc_dointvec,
374 },
375 {
376 .ctl_name = KERN_CORE_USES_PID,
377 .procname = "core_uses_pid",
378 .data = &core_uses_pid,
379 .maxlen = sizeof(int),
380 .mode = 0644,
381 .proc_handler = &proc_dointvec,
382 },
383 {
384 .ctl_name = KERN_CORE_PATTERN,
385 .procname = "core_pattern",
386 .data = core_pattern,
71ce92f3 387 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 388 .mode = 0644,
389 .proc_handler = &proc_dostring,
390 .strategy = &sysctl_string,
391 },
34f5a398 392#ifdef CONFIG_PROC_SYSCTL
1da177e4 393 {
1da177e4 394 .procname = "tainted",
25ddbb18 395 .maxlen = sizeof(long),
34f5a398 396 .mode = 0644,
25ddbb18 397 .proc_handler = &proc_taint,
1da177e4 398 },
34f5a398 399#endif
9745512c
AV		 400#ifdef CONFIG_LATENCYTOP
401 {
402 .procname = "latencytop",
403 .data = &latencytop_enabled,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = &proc_dointvec,
407 },
408#endif
1da177e4
LT		 409#ifdef CONFIG_BLK_DEV_INITRD
410 {
411 .ctl_name = KERN_REALROOTDEV,
412 .procname = "real-root-dev",
413 .data = &real_root_dev,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = &proc_dointvec,
417 },
418#endif
45807a1d
IM		 419 {
420 .ctl_name = CTL_UNNUMBERED,
421 .procname = "print-fatal-signals",
422 .data = &print_fatal_signals,
423 .maxlen = sizeof(int),
424 .mode = 0644,
425 .proc_handler = &proc_dointvec,
426 },
72c57ed5 427#ifdef CONFIG_SPARC
1da177e4
LT		 428 {
429 .ctl_name = KERN_SPARC_REBOOT,
430 .procname = "reboot-cmd",
431 .data = reboot_command,
432 .maxlen = 256,
433 .mode = 0644,
434 .proc_handler = &proc_dostring,
435 .strategy = &sysctl_string,
436 },
437 {
438 .ctl_name = KERN_SPARC_STOP_A,
439 .procname = "stop-a",
440 .data = &stop_a_enabled,
441 .maxlen = sizeof (int),
442 .mode = 0644,
443 .proc_handler = &proc_dointvec,
444 },
445 {
446 .ctl_name = KERN_SPARC_SCONS_PWROFF,
447 .procname = "scons-poweroff",
448 .data = &scons_pwroff,
449 .maxlen = sizeof (int),
450 .mode = 0644,
451 .proc_handler = &proc_dointvec,
452 },
453#endif
454#ifdef __hppa__
455 {
456 .ctl_name = KERN_HPPA_PWRSW,
457 .procname = "soft-power",
458 .data = &pwrsw_enabled,
459 .maxlen = sizeof (int),
460 .mode = 0644,
461 .proc_handler = &proc_dointvec,
462 },
463 {
464 .ctl_name = KERN_HPPA_UNALIGNED,
465 .procname = "unaligned-trap",
466 .data = &unaligned_enabled,
467 .maxlen = sizeof (int),
468 .mode = 0644,
469 .proc_handler = &proc_dointvec,
470 },
471#endif
472 {
473 .ctl_name = KERN_CTLALTDEL,
474 .procname = "ctrl-alt-del",
475 .data = &C_A_D,
476 .maxlen = sizeof(int),
477 .mode = 0644,
478 .proc_handler = &proc_dointvec,
479 },
606576ce 480#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 481 {
482 .ctl_name = CTL_UNNUMBERED,
483 .procname = "ftrace_enabled",
484 .data = &ftrace_enabled,
485 .maxlen = sizeof(int),
486 .mode = 0644,
487 .proc_handler = &ftrace_enable_sysctl,
488 },
489#endif
f38f1d2a
SR		 490#ifdef CONFIG_STACK_TRACER
491 {
492 .ctl_name = CTL_UNNUMBERED,
493 .procname = "stack_tracer_enabled",
494 .data = &stack_tracer_enabled,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = &stack_trace_sysctl,
498 },
499#endif
944ac425
SR		 500#ifdef CONFIG_TRACING
501 {
502 .ctl_name = CTL_UNNUMBERED,
3299b4dd 503 .procname = "ftrace_dump_on_oops",
944ac425
SR		 504 .data = &ftrace_dump_on_oops,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = &proc_dointvec,
508 },
509#endif
a1ef5adb 510#ifdef CONFIG_MODULES
1da177e4
LT		 511 {
512 .ctl_name = KERN_MODPROBE,
513 .procname = "modprobe",
514 .data = &modprobe_path,
515 .maxlen = KMOD_PATH_LEN,
516 .mode = 0644,
517 .proc_handler = &proc_dostring,
518 .strategy = &sysctl_string,
519 },
520#endif
57ae2508 521#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 522 {
523 .ctl_name = KERN_HOTPLUG,
524 .procname = "hotplug",
312c004d
KS		 525 .data = &uevent_helper,
526 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 527 .mode = 0644,
528 .proc_handler = &proc_dostring,
529 .strategy = &sysctl_string,
530 },
531#endif
532#ifdef CONFIG_CHR_DEV_SG
533 {
534 .ctl_name = KERN_SG_BIG_BUFF,
535 .procname = "sg-big-buff",
536 .data = &sg_big_buff,
537 .maxlen = sizeof (int),
538 .mode = 0444,
539 .proc_handler = &proc_dointvec,
540 },
541#endif
542#ifdef CONFIG_BSD_PROCESS_ACCT
543 {
544 .ctl_name = KERN_ACCT,
545 .procname = "acct",
546 .data = &acct_parm,
547 .maxlen = 3*sizeof(int),
548 .mode = 0644,
549 .proc_handler = &proc_dointvec,
550 },
551#endif
1da177e4
LT		 552#ifdef CONFIG_MAGIC_SYSRQ
553 {
554 .ctl_name = KERN_SYSRQ,
555 .procname = "sysrq",
5d6f647f 556 .data = &__sysrq_enabled,
1da177e4
LT		 557 .maxlen = sizeof (int),
558 .mode = 0644,
559 .proc_handler = &proc_dointvec,
560 },
561#endif
d6f8ff73 562#ifdef CONFIG_PROC_SYSCTL
1da177e4 563 {
1da177e4 564 .procname = "cad_pid",
9ec52099 565 .data = NULL,
1da177e4
LT		 566 .maxlen = sizeof (int),
567 .mode = 0600,
9ec52099 568 .proc_handler = &proc_do_cad_pid,
1da177e4 569 },
d6f8ff73 570#endif
1da177e4
LT		 571 {
572 .ctl_name = KERN_MAX_THREADS,
573 .procname = "threads-max",
574 .data = &max_threads,
575 .maxlen = sizeof(int),
576 .mode = 0644,
577 .proc_handler = &proc_dointvec,
578 },
579 {
580 .ctl_name = KERN_RANDOM,
581 .procname = "random",
582 .mode = 0555,
583 .child = random_table,
584 },
1da177e4
LT		 585 {
586 .ctl_name = KERN_OVERFLOWUID,
587 .procname = "overflowuid",
588 .data = &overflowuid,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = &proc_dointvec_minmax,
592 .strategy = &sysctl_intvec,
593 .extra1 = &minolduid,
594 .extra2 = &maxolduid,
595 },
596 {
597 .ctl_name = KERN_OVERFLOWGID,
598 .procname = "overflowgid",
599 .data = &overflowgid,
600 .maxlen = sizeof(int),
601 .mode = 0644,
602 .proc_handler = &proc_dointvec_minmax,
603 .strategy = &sysctl_intvec,
604 .extra1 = &minolduid,
605 .extra2 = &maxolduid,
606 },
347a8dc3 607#ifdef CONFIG_S390
1da177e4
LT		 608#ifdef CONFIG_MATHEMU
609 {
610 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
611 .procname = "ieee_emulation_warnings",
612 .data = &sysctl_ieee_emulation_warnings,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = &proc_dointvec,
616 },
1da177e4
LT		 617#endif
618 {
619 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
620 .procname = "userprocess_debug",
621 .data = &sysctl_userprocess_debug,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 .proc_handler = &proc_dointvec,
625 },
626#endif
627 {
628 .ctl_name = KERN_PIDMAX,
629 .procname = "pid_max",
630 .data = &pid_max,
631 .maxlen = sizeof (int),
632 .mode = 0644,
633 .proc_handler = &proc_dointvec_minmax,
634 .strategy = sysctl_intvec,
635 .extra1 = &pid_max_min,
636 .extra2 = &pid_max_max,
637 },
638 {
639 .ctl_name = KERN_PANIC_ON_OOPS,
640 .procname = "panic_on_oops",
641 .data = &panic_on_oops,
642 .maxlen = sizeof(int),
643 .mode = 0644,
644 .proc_handler = &proc_dointvec,
645 },
7ef3d2fd
JP		 646#if defined CONFIG_PRINTK
647 {
648 .ctl_name = KERN_PRINTK,
649 .procname = "printk",
650 .data = &console_loglevel,
651 .maxlen = 4*sizeof(int),
652 .mode = 0644,
653 .proc_handler = &proc_dointvec,
654 },
1da177e4
LT		 655 {
656 .ctl_name = KERN_PRINTK_RATELIMIT,
657 .procname = "printk_ratelimit",
717115e1 658 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = &proc_dointvec_jiffies,
662 .strategy = &sysctl_jiffies,
663 },
664 {
665 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
666 .procname = "printk_ratelimit_burst",
717115e1 667 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 668 .maxlen = sizeof(int),
669 .mode = 0644,
670 .proc_handler = &proc_dointvec,
671 },
7ef3d2fd 672#endif
1da177e4
LT		 673 {
674 .ctl_name = KERN_NGROUPS_MAX,
675 .procname = "ngroups_max",
676 .data = &ngroups_max,
677 .maxlen = sizeof (int),
678 .mode = 0444,
679 .proc_handler = &proc_dointvec,
680 },
681#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
682 {
683 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
684 .procname = "unknown_nmi_panic",
685 .data = &unknown_nmi_panic,
686 .maxlen = sizeof (int),
687 .mode = 0644,
2fbe7b25 688 .proc_handler = &proc_dointvec,
1da177e4 689 },
407984f1 690 {
407984f1
DZ		 691 .procname = "nmi_watchdog",
692 .data = &nmi_watchdog_enabled,
693 .maxlen = sizeof (int),
694 .mode = 0644,
695 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 696 },
697#endif
698#if defined(CONFIG_X86)
8da5adda
DZ		 699 {
700 .ctl_name = KERN_PANIC_ON_NMI,
701 .procname = "panic_on_unrecovered_nmi",
702 .data = &panic_on_unrecovered_nmi,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = &proc_dointvec,
706 },
1da177e4
LT		 707 {
708 .ctl_name = KERN_BOOTLOADER_TYPE,
709 .procname = "bootloader_type",
710 .data = &bootloader_type,
711 .maxlen = sizeof (int),
712 .mode = 0444,
713 .proc_handler = &proc_dointvec,
714 },
0741f4d2
CE		 715 {
716 .ctl_name = CTL_UNNUMBERED,
717 .procname = "kstack_depth_to_print",
718 .data = &kstack_depth_to_print,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = &proc_dointvec,
722 },
6e7c4025
IM		 723 {
724 .ctl_name = CTL_UNNUMBERED,
725 .procname = "io_delay_type",
726 .data = &io_delay_type,
727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = &proc_dointvec,
730 },
1da177e4 731#endif
7a9166e3 732#if defined(CONFIG_MMU)
1da177e4
LT		 733 {
734 .ctl_name = KERN_RANDOMIZE,
735 .procname = "randomize_va_space",
736 .data = &randomize_va_space,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = &proc_dointvec,
740 },
7a9166e3 741#endif
0152fb37 742#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 743 {
744 .ctl_name = KERN_SPIN_RETRY,
745 .procname = "spin_retry",
746 .data = &spin_retry,
747 .maxlen = sizeof (int),
748 .mode = 0644,
749 .proc_handler = &proc_dointvec,
750 },
c255d844 751#endif
673d5b43 752#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 753 {
c255d844 754 .procname = "acpi_video_flags",
77afcf78 755 .data = &acpi_realmode_flags,
c255d844
PM		 756 .maxlen = sizeof (unsigned long),
757 .mode = 0644,
7f99f06f 758 .proc_handler = &proc_doulongvec_minmax,
c255d844 759 },
d2b176ed
JS		 760#endif
761#ifdef CONFIG_IA64
762 {
763 .ctl_name = KERN_IA64_UNALIGNED,
764 .procname = "ignore-unaligned-usertrap",
765 .data = &no_unaligned_warning,
766 .maxlen = sizeof (int),
767 .mode = 0644,
768 .proc_handler = &proc_dointvec,
769 },
bebfa101 770#endif
c4f3b63f 771#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 772 {
773 .ctl_name = CTL_UNNUMBERED,
774 .procname = "softlockup_panic",
775 .data = &softlockup_panic,
776 .maxlen = sizeof(int),
777 .mode = 0644,
4dca10a9 778 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 779 .strategy = &sysctl_intvec,
780 .extra1 = &zero,
781 .extra2 = &one,
782 },
c4f3b63f
RT		 783 {
784 .ctl_name = CTL_UNNUMBERED,
785 .procname = "softlockup_thresh",
786 .data = &softlockup_thresh,
9383d967 787 .maxlen = sizeof(int),
c4f3b63f 788 .mode = 0644,
9383d967 789 .proc_handler = &proc_dointvec_minmax,
c4f3b63f 790 .strategy = &sysctl_intvec,
9383d967 791 .extra1 = &neg_one,
c4f3b63f
RT		 792 .extra2 = &sixty,
793 },
82a1fcb9
IM		 794 {
795 .ctl_name = CTL_UNNUMBERED,
796 .procname = "hung_task_check_count",
797 .data = &sysctl_hung_task_check_count,
90739081 798 .maxlen = sizeof(unsigned long),
82a1fcb9 799 .mode = 0644,
90739081 800 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 801 .strategy = &sysctl_intvec,
802 },
803 {
804 .ctl_name = CTL_UNNUMBERED,
805 .procname = "hung_task_timeout_secs",
806 .data = &sysctl_hung_task_timeout_secs,
90739081 807 .maxlen = sizeof(unsigned long),
82a1fcb9 808 .mode = 0644,
90739081 809 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 810 .strategy = &sysctl_intvec,
811 },
812 {
813 .ctl_name = CTL_UNNUMBERED,
814 .procname = "hung_task_warnings",
815 .data = &sysctl_hung_task_warnings,
90739081 816 .maxlen = sizeof(unsigned long),
82a1fcb9 817 .mode = 0644,
90739081 818 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 819 .strategy = &sysctl_intvec,
820 },
c4f3b63f 821#endif
bebfa101
AK		 822#ifdef CONFIG_COMPAT
823 {
824 .ctl_name = KERN_COMPAT_LOG,
825 .procname = "compat-log",
826 .data = &compat_log,
827 .maxlen = sizeof (int),
828 .mode = 0644,
829 .proc_handler = &proc_dointvec,
830 },
951f22d5 831#endif
23f78d4a
IM		 832#ifdef CONFIG_RT_MUTEXES
833 {
834 .ctl_name = KERN_MAX_LOCK_DEPTH,
835 .procname = "max_lock_depth",
836 .data = &max_lock_depth,
837 .maxlen = sizeof(int),
838 .mode = 0644,
839 .proc_handler = &proc_dointvec,
840 },
5096add8 841#endif
10a0a8d4
JF		 842 {
843 .ctl_name = CTL_UNNUMBERED,
844 .procname = "poweroff_cmd",
845 .data = &poweroff_cmd,
846 .maxlen = POWEROFF_CMD_PATH_LEN,
847 .mode = 0644,
848 .proc_handler = &proc_dostring,
849 .strategy = &sysctl_string,
850 },
0b77f5bf
DH		 851#ifdef CONFIG_KEYS
852 {
853 .ctl_name = CTL_UNNUMBERED,
854 .procname = "keys",
855 .mode = 0555,
856 .child = key_sysctls,
857 },
858#endif
31a72bce
PM		 859#ifdef CONFIG_RCU_TORTURE_TEST
860 {
861 .ctl_name = CTL_UNNUMBERED,
862 .procname = "rcutorture_runnable",
863 .data = &rcutorture_runnable,
864 .maxlen = sizeof(int),
865 .mode = 0644,
866 .proc_handler = &proc_dointvec,
867 },
868#endif
af936a16
LS		 869#ifdef CONFIG_UNEVICTABLE_LRU
870 {
871 .ctl_name = CTL_UNNUMBERED,
872 .procname = "scan_unevictable_pages",
873 .data = &scan_unevictable_pages,
874 .maxlen = sizeof(scan_unevictable_pages),
875 .mode = 0644,
876 .proc_handler = &scan_unevictable_handler,
877 },
878#endif
ed2c12f3
AM		 879/*
880 * NOTE: do not add new entries to this table unless you have read
881 * Documentation/sysctl/ctl_unnumbered.txt
882 */
1da177e4
LT		 883 { .ctl_name = 0 }
884};
885
d8217f07 886static struct ctl_table vm_table[] = {
1da177e4
LT		 887 {
888 .ctl_name = VM_OVERCOMMIT_MEMORY,
889 .procname = "overcommit_memory",
890 .data = &sysctl_overcommit_memory,
891 .maxlen = sizeof(sysctl_overcommit_memory),
892 .mode = 0644,
893 .proc_handler = &proc_dointvec,
894 },
fadd8fbd
KH		 895 {
896 .ctl_name = VM_PANIC_ON_OOM,
897 .procname = "panic_on_oom",
898 .data = &sysctl_panic_on_oom,
899 .maxlen = sizeof(sysctl_panic_on_oom),
900 .mode = 0644,
901 .proc_handler = &proc_dointvec,
902 },
fe071d7e
DR		 903 {
904 .ctl_name = CTL_UNNUMBERED,
905 .procname = "oom_kill_allocating_task",
906 .data = &sysctl_oom_kill_allocating_task,
907 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
908 .mode = 0644,
909 .proc_handler = &proc_dointvec,
910 },
fef1bdd6
DR		 911 {
912 .ctl_name = CTL_UNNUMBERED,
913 .procname = "oom_dump_tasks",
914 .data = &sysctl_oom_dump_tasks,
915 .maxlen = sizeof(sysctl_oom_dump_tasks),
916 .mode = 0644,
917 .proc_handler = &proc_dointvec,
918 },
1da177e4
LT		 919 {
920 .ctl_name = VM_OVERCOMMIT_RATIO,
921 .procname = "overcommit_ratio",
922 .data = &sysctl_overcommit_ratio,
923 .maxlen = sizeof(sysctl_overcommit_ratio),
924 .mode = 0644,
925 .proc_handler = &proc_dointvec,
926 },
927 {
928 .ctl_name = VM_PAGE_CLUSTER,
929 .procname = "page-cluster",
930 .data = &page_cluster,
931 .maxlen = sizeof(int),
932 .mode = 0644,
933 .proc_handler = &proc_dointvec,
934 },
935 {
936 .ctl_name = VM_DIRTY_BACKGROUND,
937 .procname = "dirty_background_ratio",
938 .data = &dirty_background_ratio,
939 .maxlen = sizeof(dirty_background_ratio),
940 .mode = 0644,
941 .proc_handler = &proc_dointvec_minmax,
942 .strategy = &sysctl_intvec,
943 .extra1 = &zero,
944 .extra2 = &one_hundred,
945 },
946 {
947 .ctl_name = VM_DIRTY_RATIO,
948 .procname = "dirty_ratio",
949 .data = &vm_dirty_ratio,
950 .maxlen = sizeof(vm_dirty_ratio),
951 .mode = 0644,
04fbfdc1 952 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 953 .strategy = &sysctl_intvec,
954 .extra1 = &zero,
955 .extra2 = &one_hundred,
956 },
957 {
1da177e4 958 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 959 .data = &dirty_writeback_interval,
960 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 961 .mode = 0644,
962 .proc_handler = &dirty_writeback_centisecs_handler,
963 },
964 {
1da177e4 965 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 966 .data = &dirty_expire_interval,
967 .maxlen = sizeof(dirty_expire_interval),
1da177e4 968 .mode = 0644,
f6ef9438 969 .proc_handler = &proc_dointvec_userhz_jiffies,
1da177e4
LT		 970 },
971 {
972 .ctl_name = VM_NR_PDFLUSH_THREADS,
973 .procname = "nr_pdflush_threads",
974 .data = &nr_pdflush_threads,
975 .maxlen = sizeof nr_pdflush_threads,
976 .mode = 0444 /* read-only*/,
977 .proc_handler = &proc_dointvec,
978 },
979 {
980 .ctl_name = VM_SWAPPINESS,
981 .procname = "swappiness",
982 .data = &vm_swappiness,
983 .maxlen = sizeof(vm_swappiness),
984 .mode = 0644,
985 .proc_handler = &proc_dointvec_minmax,
986 .strategy = &sysctl_intvec,
987 .extra1 = &zero,
988 .extra2 = &one_hundred,
989 },
990#ifdef CONFIG_HUGETLB_PAGE
991 {
1da177e4 992 .procname = "nr_hugepages",
e5ff2159 993 .data = NULL,
1da177e4
LT		 994 .maxlen = sizeof(unsigned long),
995 .mode = 0644,
996 .proc_handler = &hugetlb_sysctl_handler,
997 .extra1 = (void *)&hugetlb_zero,
998 .extra2 = (void *)&hugetlb_infinity,
999 },
1000 {
1001 .ctl_name = VM_HUGETLB_GROUP,
1002 .procname = "hugetlb_shm_group",
1003 .data = &sysctl_hugetlb_shm_group,
1004 .maxlen = sizeof(gid_t),
1005 .mode = 0644,
1006 .proc_handler = &proc_dointvec,
1007 },
396faf03
MG		 1008 {
1009 .ctl_name = CTL_UNNUMBERED,
1010 .procname = "hugepages_treat_as_movable",
1011 .data = &hugepages_treat_as_movable,
1012 .maxlen = sizeof(int),
1013 .mode = 0644,
1014 .proc_handler = &hugetlb_treat_movable_handler,
1015 },
d1c3fb1f
NA		 1016 {
1017 .ctl_name = CTL_UNNUMBERED,
1018 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1019 .data = NULL,
1020 .maxlen = sizeof(unsigned long),
d1c3fb1f 1021 .mode = 0644,
a3d0c6aa 1022 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1023 .extra1 = (void *)&hugetlb_zero,
1024 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1025 },
1da177e4
LT		 1026#endif
1027 {
1028 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1029 .procname = "lowmem_reserve_ratio",
1030 .data = &sysctl_lowmem_reserve_ratio,
1031 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1032 .mode = 0644,
1033 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1034 .strategy = &sysctl_intvec,
1035 },
9d0243bc
AM		 1036 {
1037 .ctl_name = VM_DROP_PAGECACHE,
1038 .procname = "drop_caches",
1039 .data = &sysctl_drop_caches,
1040 .maxlen = sizeof(int),
1041 .mode = 0644,
1042 .proc_handler = drop_caches_sysctl_handler,
1043 .strategy = &sysctl_intvec,
1044 },
1da177e4
LT		 1045 {
1046 .ctl_name = VM_MIN_FREE_KBYTES,
1047 .procname = "min_free_kbytes",
1048 .data = &min_free_kbytes,
1049 .maxlen = sizeof(min_free_kbytes),
1050 .mode = 0644,
1051 .proc_handler = &min_free_kbytes_sysctl_handler,
1052 .strategy = &sysctl_intvec,
1053 .extra1 = &zero,
1054 },
8ad4b1fb
RS		 1055 {
1056 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1057 .procname = "percpu_pagelist_fraction",
1058 .data = &percpu_pagelist_fraction,
1059 .maxlen = sizeof(percpu_pagelist_fraction),
1060 .mode = 0644,
1061 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1062 .strategy = &sysctl_intvec,
1063 .extra1 = &min_percpu_pagelist_fract,
1064 },
1da177e4
LT		 1065#ifdef CONFIG_MMU
1066 {
1067 .ctl_name = VM_MAX_MAP_COUNT,
1068 .procname = "max_map_count",
1069 .data = &sysctl_max_map_count,
1070 .maxlen = sizeof(sysctl_max_map_count),
1071 .mode = 0644,
1072 .proc_handler = &proc_dointvec
1073 },
1074#endif
1075 {
1076 .ctl_name = VM_LAPTOP_MODE,
1077 .procname = "laptop_mode",
1078 .data = &laptop_mode,
1079 .maxlen = sizeof(laptop_mode),
1080 .mode = 0644,
ed5b43f1
BS		 1081 .proc_handler = &proc_dointvec_jiffies,
1082 .strategy = &sysctl_jiffies,
1da177e4
LT		 1083 },
1084 {
1085 .ctl_name = VM_BLOCK_DUMP,
1086 .procname = "block_dump",
1087 .data = &block_dump,
1088 .maxlen = sizeof(block_dump),
1089 .mode = 0644,
1090 .proc_handler = &proc_dointvec,
1091 .strategy = &sysctl_intvec,
1092 .extra1 = &zero,
1093 },
1094 {
1095 .ctl_name = VM_VFS_CACHE_PRESSURE,
1096 .procname = "vfs_cache_pressure",
1097 .data = &sysctl_vfs_cache_pressure,
1098 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1099 .mode = 0644,
1100 .proc_handler = &proc_dointvec,
1101 .strategy = &sysctl_intvec,
1102 .extra1 = &zero,
1103 },
1104#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1105 {
1106 .ctl_name = VM_LEGACY_VA_LAYOUT,
1107 .procname = "legacy_va_layout",
1108 .data = &sysctl_legacy_va_layout,
1109 .maxlen = sizeof(sysctl_legacy_va_layout),
1110 .mode = 0644,
1111 .proc_handler = &proc_dointvec,
1112 .strategy = &sysctl_intvec,
1113 .extra1 = &zero,
1114 },
1115#endif
1743660b
CL		 1116#ifdef CONFIG_NUMA
1117 {
1118 .ctl_name = VM_ZONE_RECLAIM_MODE,
1119 .procname = "zone_reclaim_mode",
1120 .data = &zone_reclaim_mode,
1121 .maxlen = sizeof(zone_reclaim_mode),
1122 .mode = 0644,
1123 .proc_handler = &proc_dointvec,
c84db23c
CL		 1124 .strategy = &sysctl_intvec,
1125 .extra1 = &zero,
1743660b 1126 },
9614634f
CL		 1127 {
1128 .ctl_name = VM_MIN_UNMAPPED,
1129 .procname = "min_unmapped_ratio",
1130 .data = &sysctl_min_unmapped_ratio,
1131 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1132 .mode = 0644,
1133 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1134 .strategy = &sysctl_intvec,
1135 .extra1 = &zero,
1136 .extra2 = &one_hundred,
1137 },
0ff38490
CL		 1138 {
1139 .ctl_name = VM_MIN_SLAB,
1140 .procname = "min_slab_ratio",
1141 .data = &sysctl_min_slab_ratio,
1142 .maxlen = sizeof(sysctl_min_slab_ratio),
1143 .mode = 0644,
1144 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1145 .strategy = &sysctl_intvec,
1146 .extra1 = &zero,
1147 .extra2 = &one_hundred,
1148 },
e6e5494c 1149#endif
77461ab3
CL		 1150#ifdef CONFIG_SMP
1151 {
1152 .ctl_name = CTL_UNNUMBERED,
1153 .procname = "stat_interval",
1154 .data = &sysctl_stat_interval,
1155 .maxlen = sizeof(sysctl_stat_interval),
1156 .mode = 0644,
1157 .proc_handler = &proc_dointvec_jiffies,
1158 .strategy = &sysctl_jiffies,
1159 },
1160#endif
ed032189
EP		 1161#ifdef CONFIG_SECURITY
1162 {
1163 .ctl_name = CTL_UNNUMBERED,
1164 .procname = "mmap_min_addr",
1165 .data = &mmap_min_addr,
1166 .maxlen = sizeof(unsigned long),
1167 .mode = 0644,
1168 .proc_handler = &proc_doulongvec_minmax,
1169 },
8daec965 1170#endif
f0c0b2b8
KH		 1171#ifdef CONFIG_NUMA
1172 {
1173 .ctl_name = CTL_UNNUMBERED,
1174 .procname = "numa_zonelist_order",
1175 .data = &numa_zonelist_order,
1176 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1177 .mode = 0644,
1178 .proc_handler = &numa_zonelist_order_handler,
1179 .strategy = &sysctl_string,
1180 },
1181#endif
2b8232ce 1182#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1183 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1184 {
1185 .ctl_name = VM_VDSO_ENABLED,
1186 .procname = "vdso_enabled",
1187 .data = &vdso_enabled,
1188 .maxlen = sizeof(vdso_enabled),
1189 .mode = 0644,
1190 .proc_handler = &proc_dointvec,
1191 .strategy = &sysctl_intvec,
1192 .extra1 = &zero,
1193 },
1da177e4 1194#endif
195cf453
BG		 1195#ifdef CONFIG_HIGHMEM
1196 {
1197 .ctl_name = CTL_UNNUMBERED,
1198 .procname = "highmem_is_dirtyable",
1199 .data = &vm_highmem_is_dirtyable,
1200 .maxlen = sizeof(vm_highmem_is_dirtyable),
1201 .mode = 0644,
1202 .proc_handler = &proc_dointvec_minmax,
1203 .strategy = &sysctl_intvec,
1204 .extra1 = &zero,
1205 .extra2 = &one,
1206 },
1207#endif
2be7fe07
AM		 1208/*
1209 * NOTE: do not add new entries to this table unless you have read
1210 * Documentation/sysctl/ctl_unnumbered.txt
1211 */
1da177e4
LT		 1212 { .ctl_name = 0 }
1213};
1214
2abc26fc 1215#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1216static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1217 { .ctl_name = 0 }
1218};
1219#endif
1220
d8217f07 1221static struct ctl_table fs_table[] = {
1da177e4
LT		 1222 {
1223 .ctl_name = FS_NRINODE,
1224 .procname = "inode-nr",
1225 .data = &inodes_stat,
1226 .maxlen = 2*sizeof(int),
1227 .mode = 0444,
1228 .proc_handler = &proc_dointvec,
1229 },
1230 {
1231 .ctl_name = FS_STATINODE,
1232 .procname = "inode-state",
1233 .data = &inodes_stat,
1234 .maxlen = 7*sizeof(int),
1235 .mode = 0444,
1236 .proc_handler = &proc_dointvec,
1237 },
1238 {
1da177e4
LT		 1239 .procname = "file-nr",
1240 .data = &files_stat,
1241 .maxlen = 3*sizeof(int),
1242 .mode = 0444,
529bf6be 1243 .proc_handler = &proc_nr_files,
1da177e4
LT		 1244 },
1245 {
1246 .ctl_name = FS_MAXFILE,
1247 .procname = "file-max",
1248 .data = &files_stat.max_files,
1249 .maxlen = sizeof(int),
1250 .mode = 0644,
1251 .proc_handler = &proc_dointvec,
1252 },
9cfe015a
ED		 1253 {
1254 .ctl_name = CTL_UNNUMBERED,
1255 .procname = "nr_open",
1256 .data = &sysctl_nr_open,
1257 .maxlen = sizeof(int),
1258 .mode = 0644,
eceea0b3
AV		 1259 .proc_handler = &proc_dointvec_minmax,
1260 .extra1 = &sysctl_nr_open_min,
1261 .extra2 = &sysctl_nr_open_max,
9cfe015a 1262 },
1da177e4
LT		 1263 {
1264 .ctl_name = FS_DENTRY,
1265 .procname = "dentry-state",
1266 .data = &dentry_stat,
1267 .maxlen = 6*sizeof(int),
1268 .mode = 0444,
1269 .proc_handler = &proc_dointvec,
1270 },
1271 {
1272 .ctl_name = FS_OVERFLOWUID,
1273 .procname = "overflowuid",
1274 .data = &fs_overflowuid,
1275 .maxlen = sizeof(int),
1276 .mode = 0644,
1277 .proc_handler = &proc_dointvec_minmax,
1278 .strategy = &sysctl_intvec,
1279 .extra1 = &minolduid,
1280 .extra2 = &maxolduid,
1281 },
1282 {
1283 .ctl_name = FS_OVERFLOWGID,
1284 .procname = "overflowgid",
1285 .data = &fs_overflowgid,
1286 .maxlen = sizeof(int),
1287 .mode = 0644,
1288 .proc_handler = &proc_dointvec_minmax,
1289 .strategy = &sysctl_intvec,
1290 .extra1 = &minolduid,
1291 .extra2 = &maxolduid,
1292 },
bfcd17a6 1293#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1294 {
1295 .ctl_name = FS_LEASES,
1296 .procname = "leases-enable",
1297 .data = &leases_enable,
1298 .maxlen = sizeof(int),
1299 .mode = 0644,
1300 .proc_handler = &proc_dointvec,
1301 },
bfcd17a6 1302#endif
1da177e4
LT		 1303#ifdef CONFIG_DNOTIFY
1304 {
1305 .ctl_name = FS_DIR_NOTIFY,
1306 .procname = "dir-notify-enable",
1307 .data = &dir_notify_enable,
1308 .maxlen = sizeof(int),
1309 .mode = 0644,
1310 .proc_handler = &proc_dointvec,
1311 },
1312#endif
1313#ifdef CONFIG_MMU
bfcd17a6 1314#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1315 {
1316 .ctl_name = FS_LEASE_TIME,
1317 .procname = "lease-break-time",
1318 .data = &lease_break_time,
1319 .maxlen = sizeof(int),
1320 .mode = 0644,
76fdbb25
KH		 1321 .proc_handler = &proc_dointvec_minmax,
1322 .strategy = &sysctl_intvec,
1323 .extra1 = &zero,
1324 .extra2 = &two,
1da177e4 1325 },
bfcd17a6 1326#endif
ebf3f09c 1327#ifdef CONFIG_AIO
1da177e4 1328 {
1da177e4
LT		 1329 .procname = "aio-nr",
1330 .data = &aio_nr,
1331 .maxlen = sizeof(aio_nr),
1332 .mode = 0444,
d55b5fda 1333 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1334 },
1335 {
1da177e4
LT		 1336 .procname = "aio-max-nr",
1337 .data = &aio_max_nr,
1338 .maxlen = sizeof(aio_max_nr),
1339 .mode = 0644,
d55b5fda 1340 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1341 },
ebf3f09c 1342#endif /* CONFIG_AIO */
2d9048e2 1343#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1344 {
1345 .ctl_name = FS_INOTIFY,
1346 .procname = "inotify",
1347 .mode = 0555,
1348 .child = inotify_table,
1349 },
1350#endif
7ef9964e
DL		 1351#ifdef CONFIG_EPOLL
1352 {
1353 .procname = "epoll",
1354 .mode = 0555,
1355 .child = epoll_table,
1356 },
1357#endif
1da177e4 1358#endif
d6e71144
AC		 1359 {
1360 .ctl_name = KERN_SETUID_DUMPABLE,
1361 .procname = "suid_dumpable",
1362 .data = &suid_dumpable,
1363 .maxlen = sizeof(int),
1364 .mode = 0644,
1365 .proc_handler = &proc_dointvec,
1366 },
2abc26fc
EB		 1367#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1368 {
1369 .ctl_name = CTL_UNNUMBERED,
1370 .procname = "binfmt_misc",
1371 .mode = 0555,
1372 .child = binfmt_misc_table,
1373 },
1374#endif
2be7fe07
AM		 1375/*
1376 * NOTE: do not add new entries to this table unless you have read
1377 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1378 */
1da177e4
LT		 1379 { .ctl_name = 0 }
1380};
1381
d8217f07 1382static struct ctl_table debug_table[] = {
d0c3d534 1383#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1384 {
1385 .ctl_name = CTL_UNNUMBERED,
1386 .procname = "exception-trace",
1387 .data = &show_unhandled_signals,
1388 .maxlen = sizeof(int),
1389 .mode = 0644,
1390 .proc_handler = proc_dointvec
1391 },
1392#endif
1da177e4
LT		 1393 { .ctl_name = 0 }
1394};
1395
d8217f07 1396static struct ctl_table dev_table[] = {
1da177e4 1397 { .ctl_name = 0 }
0eeca283 1398};
1da177e4 1399
330d57fb
AV		 1400static DEFINE_SPINLOCK(sysctl_lock);
1401
1402/* called under sysctl_lock */
1403static int use_table(struct ctl_table_header *p)
1404{
1405 if (unlikely(p->unregistering))
1406 return 0;
1407 p->used++;
1408 return 1;
1409}
1410
1411/* called under sysctl_lock */
1412static void unuse_table(struct ctl_table_header *p)
1413{
1414 if (!--p->used)
1415 if (unlikely(p->unregistering))
1416 complete(p->unregistering);
1417}
1418
1419/* called under sysctl_lock, will reacquire if has to wait */
1420static void start_unregistering(struct ctl_table_header *p)
1421{
1422 /*
1423 * if p->used is 0, nobody will ever touch that entry again;
1424 * we'll eliminate all paths to it before dropping sysctl_lock
1425 */
1426 if (unlikely(p->used)) {
1427 struct completion wait;
1428 init_completion(&wait);
1429 p->unregistering = &wait;
1430 spin_unlock(&sysctl_lock);
1431 wait_for_completion(&wait);
1432 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1433 } else {
1434 /* anything non-NULL; we'll never dereference it */
1435 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1436 }
1437 /*
1438 * do not remove from the list until nobody holds it; walking the
1439 * list in do_sysctl() relies on that.
1440 */
1441 list_del_init(&p->ctl_entry);
1442}
1443
f7e6ced4
AV		 1444void sysctl_head_get(struct ctl_table_header *head)
1445{
1446 spin_lock(&sysctl_lock);
1447 head->count++;
1448 spin_unlock(&sysctl_lock);
1449}
1450
1451void sysctl_head_put(struct ctl_table_header *head)
1452{
1453 spin_lock(&sysctl_lock);
1454 if (!--head->count)
1455 kfree(head);
1456 spin_unlock(&sysctl_lock);
1457}
1458
1459struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1460{
1461 if (!head)
1462 BUG();
1463 spin_lock(&sysctl_lock);
1464 if (!use_table(head))
1465 head = ERR_PTR(-ENOENT);
1466 spin_unlock(&sysctl_lock);
1467 return head;
1468}
1469
805b5d5e
EB		 1470void sysctl_head_finish(struct ctl_table_header *head)
1471{
1472 if (!head)
1473 return;
1474 spin_lock(&sysctl_lock);
1475 unuse_table(head);
1476 spin_unlock(&sysctl_lock);
1477}
1478
73455092
AV		 1479static struct ctl_table_set *
1480lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1481{
1482 struct ctl_table_set *set = &root->default_set;
1483 if (root->lookup)
1484 set = root->lookup(root, namespaces);
1485 return set;
1486}
1487
e51b6ba0
EB		 1488static struct list_head *
1489lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1490{
73455092
AV		 1491 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1492 return &set->list;
e51b6ba0
EB		 1493}
1494
1495struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1496 struct ctl_table_header *prev)
1497{
1498 struct ctl_table_root *root;
1499 struct list_head *header_list;
805b5d5e
EB		 1500 struct ctl_table_header *head;
1501 struct list_head *tmp;
e51b6ba0 1502
805b5d5e
EB		 1503 spin_lock(&sysctl_lock);
1504 if (prev) {
e51b6ba0 1505 head = prev;
805b5d5e
EB		 1506 tmp = &prev->ctl_entry;
1507 unuse_table(prev);
1508 goto next;
1509 }
1510 tmp = &root_table_header.ctl_entry;
1511 for (;;) {
1512 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1513
1514 if (!use_table(head))
1515 goto next;
1516 spin_unlock(&sysctl_lock);
1517 return head;
1518 next:
e51b6ba0 1519 root = head->root;
805b5d5e 1520 tmp = tmp->next;
e51b6ba0
EB		 1521 header_list = lookup_header_list(root, namespaces);
1522 if (tmp != header_list)
1523 continue;
1524
1525 do {
1526 root = list_entry(root->root_list.next,
1527 struct ctl_table_root, root_list);
1528 if (root == &sysctl_table_root)
1529 goto out;
1530 header_list = lookup_header_list(root, namespaces);
1531 } while (list_empty(header_list));
1532 tmp = header_list->next;
805b5d5e 1533 }
e51b6ba0 1534out:
805b5d5e
EB		 1535 spin_unlock(&sysctl_lock);
1536 return NULL;
1537}
1538
e51b6ba0
EB		 1539struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1540{
1541 return __sysctl_head_next(current->nsproxy, prev);
1542}
1543
1544void register_sysctl_root(struct ctl_table_root *root)
1545{
1546 spin_lock(&sysctl_lock);
1547 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1548 spin_unlock(&sysctl_lock);
1549}
1550
b89a8171 1551#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1552/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1553static int do_sysctl_strategy(struct ctl_table_root *root,
1554 struct ctl_table *table,
2c4c7155
PE		 1555 void __user *oldval, size_t __user *oldlenp,
1556 void __user *newval, size_t newlen)
1557{
1558 int op = 0, rc;
1559
1560 if (oldval)
e6305c43 1561 op |= MAY_READ;
2c4c7155 1562 if (newval)
e6305c43 1563 op |= MAY_WRITE;
d7321cd6 1564 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1565 return -EPERM;
1566
1567 if (table->strategy) {
f221e726 1568 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1569 if (rc < 0)
1570 return rc;
1571 if (rc > 0)
1572 return 0;
1573 }
1574
1575 /* If there is no strategy routine, or if the strategy returns
1576 * zero, proceed with automatic r/w */
1577 if (table->data && table->maxlen) {
f221e726 1578 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1579 if (rc < 0)
1580 return rc;
1581 }
1582 return 0;
1583}
1584
1585static int parse_table(int __user *name, int nlen,
1586 void __user *oldval, size_t __user *oldlenp,
1587 void __user *newval, size_t newlen,
d7321cd6 1588 struct ctl_table_root *root,
2c4c7155
PE		 1589 struct ctl_table *table)
1590{
1591 int n;
1592repeat:
1593 if (!nlen)
1594 return -ENOTDIR;
1595 if (get_user(n, name))
1596 return -EFAULT;
1597 for ( ; table->ctl_name || table->procname; table++) {
1598 if (!table->ctl_name)
1599 continue;
1600 if (n == table->ctl_name) {
1601 int error;
1602 if (table->child) {
e6305c43 1603 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1604 return -EPERM;
1605 name++;
1606 nlen--;
1607 table = table->child;
1608 goto repeat;
1609 }
f221e726 1610 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1611 oldval, oldlenp,
1612 newval, newlen);
1613 return error;
1614 }
1615 }
1616 return -ENOTDIR;
1617}
1618
1da177e4
LT		 1619int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1620 void __user *newval, size_t newlen)
1621{
805b5d5e 1622 struct ctl_table_header *head;
330d57fb 1623 int error = -ENOTDIR;
1da177e4
LT		 1624
1625 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1626 return -ENOTDIR;
1627 if (oldval) {
1628 int old_len;
1629 if (!oldlenp || get_user(old_len, oldlenp))
1630 return -EFAULT;
1631 }
330d57fb 1632
805b5d5e
EB		 1633 for (head = sysctl_head_next(NULL); head;
1634 head = sysctl_head_next(head)) {
330d57fb 1635 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1636 newval, newlen,
1637 head->root, head->ctl_table);
805b5d5e
EB		 1638 if (error != -ENOTDIR) {
1639 sysctl_head_finish(head);
330d57fb 1640 break;
805b5d5e
EB		 1641 }
1642 }
330d57fb 1643 return error;
1da177e4
LT		 1644}
1645
1646asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1647{
1648 struct __sysctl_args tmp;
1649 int error;
1650
1651 if (copy_from_user(&tmp, args, sizeof(tmp)))
1652 return -EFAULT;
1653
7058cb02
EB		 1654 error = deprecated_sysctl_warning(&tmp);
1655 if (error)
1656 goto out;
1657
1da177e4
LT		 1658 lock_kernel();
1659 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1660 tmp.newval, tmp.newlen);
1661 unlock_kernel();
7058cb02 1662out:
1da177e4
LT		 1663 return error;
1664}
b89a8171 1665#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1666
1667/*
1ff007eb 1668 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1669 * some sysctl variables are readonly even to root.
1670 */
1671
1672static int test_perm(int mode, int op)
1673{
76aac0e9 1674 if (!current_euid())
1da177e4
LT		 1675 mode >>= 6;
1676 else if (in_egroup_p(0))
1677 mode >>= 3;
e6305c43 1678 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1679 return 0;
1680 return -EACCES;
1681}
1682
d7321cd6 1683int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1684{
1685 int error;
d7321cd6
PE		 1686 int mode;
1687
e6305c43 1688 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1689 if (error)
1690 return error;
d7321cd6
PE		 1691
1692 if (root->permissions)
1693 mode = root->permissions(root, current->nsproxy, table);
1694 else
1695 mode = table->mode;
1696
1697 return test_perm(mode, op);
1da177e4
LT		 1698}
1699
d912b0cc
EB		 1700static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1701{
1702 for (; table->ctl_name || table->procname; table++) {
1703 table->parent = parent;
1704 if (table->child)
1705 sysctl_set_parent(table, table->child);
1706 }
1707}
1708
1709static __init int sysctl_init(void)
1710{
1711 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1712#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1713 {
1714 int err;
1715 err = sysctl_check_table(current->nsproxy, root_table);
1716 }
1717#endif
d912b0cc
EB		 1718 return 0;
1719}
1720
1721core_initcall(sysctl_init);
1722
bfbcf034
AV		 1723static struct ctl_table *is_branch_in(struct ctl_table *branch,
1724 struct ctl_table *table)
ae7edecc
AV		 1725{
1726 struct ctl_table *p;
1727 const char *s = branch->procname;
1728
1729 /* branch should have named subdirectory as its first element */
1730 if (!s || !branch->child)
bfbcf034 1731 return NULL;
ae7edecc
AV		 1732
1733 /* ... and nothing else */
1734 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1735 return NULL;
ae7edecc
AV		 1736
1737 /* table should contain subdirectory with the same name */
1738 for (p = table; p->procname || p->ctl_name; p++) {
1739 if (!p->child)
1740 continue;
1741 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1742 return p;
ae7edecc 1743 }
bfbcf034 1744 return NULL;
ae7edecc
AV		 1745}
1746
1747/* see if attaching q to p would be an improvement */
1748static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1749{
1750 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1751 struct ctl_table *next;
ae7edecc
AV		 1752 int is_better = 0;
1753 int not_in_parent = !p->attached_by;
1754
bfbcf034 1755 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1756 if (by == q->attached_by)
1757 is_better = 1;
1758 if (to == p->attached_by)
1759 not_in_parent = 1;
1760 by = by->child;
bfbcf034 1761 to = next->child;
ae7edecc
AV		 1762 }
1763
1764 if (is_better && not_in_parent) {
1765 q->attached_by = by;
1766 q->attached_to = to;
1767 q->parent = p;
1768 }
1769}
1770
1da177e4 1771/**
e51b6ba0
EB		 1772 * __register_sysctl_paths - register a sysctl hierarchy
1773 * @root: List of sysctl headers to register on
1774 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1775 * @path: The path to the directory the sysctl table is in.
1da177e4 1776 * @table: the top-level table structure
1da177e4
LT		 1777 *
1778 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1779 * array. A completely 0 filled entry terminates the table.
1da177e4 1780 *
d8217f07 1781 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1782 *
1783 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1784 * must be unique within that level of sysctl
1785 *
1786 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1787 * enter a sysctl file
1788 *
1789 * data - a pointer to data for use by proc_handler
1790 *
1791 * maxlen - the maximum size in bytes of the data
1792 *
1793 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1794 *
1795 * child - a pointer to the child sysctl table if this entry is a directory, or
1796 * %NULL.
1797 *
1798 * proc_handler - the text handler routine (described below)
1799 *
1800 * strategy - the strategy routine (described below)
1801 *
1802 * de - for internal use by the sysctl routines
1803 *
1804 * extra1, extra2 - extra pointers usable by the proc handler routines
1805 *
1806 * Leaf nodes in the sysctl tree will be represented by a single file
1807 * under /proc; non-leaf nodes will be represented by directories.
1808 *
1809 * sysctl(2) can automatically manage read and write requests through
1810 * the sysctl table. The data and maxlen fields of the ctl_table
1811 * struct enable minimal validation of the values being written to be
1812 * performed, and the mode field allows minimal authentication.
1813 *
1814 * More sophisticated management can be enabled by the provision of a
1815 * strategy routine with the table entry. This will be called before
1816 * any automatic read or write of the data is performed.
1817 *
1818 * The strategy routine may return
1819 *
1820 * < 0 - Error occurred (error is passed to user process)
1821 *
1822 * 0 - OK - proceed with automatic read or write.
1823 *
1824 * > 0 - OK - read or write has been done by the strategy routine, so
1825 * return immediately.
1826 *
1827 * There must be a proc_handler routine for any terminal nodes
1828 * mirrored under /proc/sys (non-terminals are handled by a built-in
1829 * directory handler). Several default handlers are available to
1830 * cover common cases -
1831 *
1832 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1833 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1834 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1835 *
1836 * It is the handler's job to read the input buffer from user memory
1837 * and process it. The handler should return 0 on success.
1838 *
1839 * This routine returns %NULL on a failure to register, and a pointer
1840 * to the table header on success.
1841 */
e51b6ba0
EB		 1842struct ctl_table_header *__register_sysctl_paths(
1843 struct ctl_table_root *root,
1844 struct nsproxy *namespaces,
1845 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1846{
29e796fd
EB		 1847 struct ctl_table_header *header;
1848 struct ctl_table *new, **prevp;
1849 unsigned int n, npath;
ae7edecc 1850 struct ctl_table_set *set;
29e796fd
EB		 1851
1852 /* Count the path components */
1853 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1854 ;
1855
1856 /*
1857 * For each path component, allocate a 2-element ctl_table array.
1858 * The first array element will be filled with the sysctl entry
1859 * for this, the second will be the sentinel (ctl_name == 0).
1860 *
1861 * We allocate everything in one go so that we don't have to
1862 * worry about freeing additional memory in unregister_sysctl_table.
1863 */
1864 header = kzalloc(sizeof(struct ctl_table_header) +
1865 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1866 if (!header)
1da177e4 1867 return NULL;
29e796fd
EB		 1868
1869 new = (struct ctl_table *) (header + 1);
1870
1871 /* Now connect the dots */
1872 prevp = &header->ctl_table;
1873 for (n = 0; n < npath; ++n, ++path) {
1874 /* Copy the procname */
1875 new->procname = path->procname;
1876 new->ctl_name = path->ctl_name;
1877 new->mode = 0555;
1878
1879 *prevp = new;
1880 prevp = &new->child;
1881
1882 new += 2;
1883 }
1884 *prevp = table;
23eb06de 1885 header->ctl_table_arg = table;
29e796fd
EB		 1886
1887 INIT_LIST_HEAD(&header->ctl_entry);
1888 header->used = 0;
1889 header->unregistering = NULL;
e51b6ba0 1890 header->root = root;
29e796fd 1891 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1892 header->count = 1;
88f458e4 1893#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1894 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1895 kfree(header);
fc6cd25b
EB		 1896 return NULL;
1897 }
88f458e4 1898#endif
330d57fb 1899 spin_lock(&sysctl_lock);
73455092 1900 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 1901 header->attached_by = header->ctl_table;
1902 header->attached_to = root_table;
1903 header->parent = &root_table_header;
1904 for (set = header->set; set; set = set->parent) {
1905 struct ctl_table_header *p;
1906 list_for_each_entry(p, &set->list, ctl_entry) {
1907 if (p->unregistering)
1908 continue;
1909 try_attach(p, header);
1910 }
1911 }
1912 header->parent->count++;
73455092 1913 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 1914 spin_unlock(&sysctl_lock);
29e796fd
EB		 1915
1916 return header;
1917}
1918
e51b6ba0
EB		 1919/**
1920 * register_sysctl_table_path - register a sysctl table hierarchy
1921 * @path: The path to the directory the sysctl table is in.
1922 * @table: the top-level table structure
1923 *
1924 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1925 * array. A completely 0 filled entry terminates the table.
1926 *
1927 * See __register_sysctl_paths for more details.
1928 */
1929struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1930 struct ctl_table *table)
1931{
1932 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1933 path, table);
1934}
1935
29e796fd
EB		 1936/**
1937 * register_sysctl_table - register a sysctl table hierarchy
1938 * @table: the top-level table structure
1939 *
1940 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1941 * array. A completely 0 filled entry terminates the table.
1942 *
1943 * See register_sysctl_paths for more details.
1944 */
1945struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1946{
1947 static const struct ctl_path null_path[] = { {} };
1948
1949 return register_sysctl_paths(null_path, table);
1da177e4
LT		 1950}
1951
1952/**
1953 * unregister_sysctl_table - unregister a sysctl table hierarchy
1954 * @header: the header returned from register_sysctl_table
1955 *
1956 * Unregisters the sysctl table and all children. proc entries may not
1957 * actually be removed until they are no longer used by anyone.
1958 */
1959void unregister_sysctl_table(struct ctl_table_header * header)
1960{
330d57fb 1961 might_sleep();
f1dad166
PE		 1962
1963 if (header == NULL)
1964 return;
1965
330d57fb
AV		 1966 spin_lock(&sysctl_lock);
1967 start_unregistering(header);
ae7edecc
AV		 1968 if (!--header->parent->count) {
1969 WARN_ON(1);
1970 kfree(header->parent);
1971 }
f7e6ced4
AV		 1972 if (!--header->count)
1973 kfree(header);
330d57fb 1974 spin_unlock(&sysctl_lock);
1da177e4
LT		 1975}
1976
9043476f
AV		 1977int sysctl_is_seen(struct ctl_table_header *p)
1978{
1979 struct ctl_table_set *set = p->set;
1980 int res;
1981 spin_lock(&sysctl_lock);
1982 if (p->unregistering)
1983 res = 0;
1984 else if (!set->is_seen)
1985 res = 1;
1986 else
1987 res = set->is_seen(set);
1988 spin_unlock(&sysctl_lock);
1989 return res;
1990}
1991
73455092
AV		 1992void setup_sysctl_set(struct ctl_table_set *p,
1993 struct ctl_table_set *parent,
1994 int (*is_seen)(struct ctl_table_set *))
1995{
1996 INIT_LIST_HEAD(&p->list);
1997 p->parent = parent ? parent : &sysctl_table_root.default_set;
1998 p->is_seen = is_seen;
1999}
2000
b89a8171 2001#else /* !CONFIG_SYSCTL */
d8217f07 2002struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2003{
2004 return NULL;
2005}
2006
29e796fd
EB		 2007struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2008 struct ctl_table *table)
2009{
2010 return NULL;
2011}
2012
b89a8171
EB		 2013void unregister_sysctl_table(struct ctl_table_header * table)
2014{
2015}
2016
73455092
AV		 2017void setup_sysctl_set(struct ctl_table_set *p,
2018 struct ctl_table_set *parent,
2019 int (*is_seen)(struct ctl_table_set *))
2020{
2021}
2022
f7e6ced4
AV		 2023void sysctl_head_put(struct ctl_table_header *head)
2024{
2025}
2026
b89a8171
EB		 2027#endif /* CONFIG_SYSCTL */
2028
1da177e4
LT		 2029/*
2030 * /proc/sys support
2031 */
2032
b89a8171 2033#ifdef CONFIG_PROC_SYSCTL
1da177e4 2034
b1ba4ddd
AB		 2035static int _proc_do_string(void* data, int maxlen, int write,
2036 struct file *filp, void __user *buffer,
2037 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2038{
2039 size_t len;
2040 char __user *p;
2041 char c;
8d060877
ON		 2042
2043 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2044 *lenp = 0;
2045 return 0;
2046 }
8d060877 2047
1da177e4
LT		 2048 if (write) {
2049 len = 0;
2050 p = buffer;
2051 while (len < *lenp) {
2052 if (get_user(c, p++))
2053 return -EFAULT;
2054 if (c == 0 || c == '\n')
2055 break;
2056 len++;
2057 }
f5dd3d6f
SV		 2058 if (len >= maxlen)
2059 len = maxlen-1;
2060 if(copy_from_user(data, buffer, len))
1da177e4 2061 return -EFAULT;
f5dd3d6f 2062 ((char *) data)[len] = 0;
1da177e4
LT		 2063 *ppos += *lenp;
2064 } else {
f5dd3d6f
SV		 2065 len = strlen(data);
2066 if (len > maxlen)
2067 len = maxlen;
8d060877
ON		 2068
2069 if (*ppos > len) {
2070 *lenp = 0;
2071 return 0;
2072 }
2073
2074 data += *ppos;
2075 len -= *ppos;
2076
1da177e4
LT		 2077 if (len > *lenp)
2078 len = *lenp;
2079 if (len)
f5dd3d6f 2080 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2081 return -EFAULT;
2082 if (len < *lenp) {
2083 if(put_user('\n', ((char __user *) buffer) + len))
2084 return -EFAULT;
2085 len++;
2086 }
2087 *lenp = len;
2088 *ppos += len;
2089 }
2090 return 0;
2091}
2092
f5dd3d6f
SV		 2093/**
2094 * proc_dostring - read a string sysctl
2095 * @table: the sysctl table
2096 * @write: %TRUE if this is a write to the sysctl file
2097 * @filp: the file structure
2098 * @buffer: the user buffer
2099 * @lenp: the size of the user buffer
2100 * @ppos: file position
2101 *
2102 * Reads/writes a string from/to the user buffer. If the kernel
2103 * buffer provided is not large enough to hold the string, the
2104 * string is truncated. The copied string is %NULL-terminated.
2105 * If the string is being read by the user process, it is copied
2106 * and a newline '\n' is added. It is truncated if the buffer is
2107 * not large enough.
2108 *
2109 * Returns 0 on success.
2110 */
d8217f07 2111int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2112 void __user *buffer, size_t *lenp, loff_t *ppos)
2113{
2114 return _proc_do_string(table->data, table->maxlen, write, filp,
2115 buffer, lenp, ppos);
2116}
2117
1da177e4
LT		 2118
2119static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2120 int *valp,
2121 int write, void *data)
2122{
2123 if (write) {
2124 *valp = *negp ? -*lvalp : *lvalp;
2125 } else {
2126 int val = *valp;
2127 if (val < 0) {
2128 *negp = -1;
2129 *lvalp = (unsigned long)-val;
2130 } else {
2131 *negp = 0;
2132 *lvalp = (unsigned long)val;
2133 }
2134 }
2135 return 0;
2136}
2137
d8217f07 2138static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2139 int write, struct file *filp, void __user *buffer,
2140 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2141 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2142 int write, void *data),
2143 void *data)
2144{
2145#define TMPBUFLEN 21
2146 int *i, vleft, first=1, neg, val;
2147 unsigned long lval;
2148 size_t left, len;
2149
2150 char buf[TMPBUFLEN], *p;
2151 char __user *s = buffer;
2152
fcfbd547 2153 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2154 (*ppos && !write)) {
2155 *lenp = 0;
2156 return 0;
2157 }
2158
fcfbd547 2159 i = (int *) tbl_data;
1da177e4
LT		 2160 vleft = table->maxlen / sizeof(*i);
2161 left = *lenp;
2162
2163 if (!conv)
2164 conv = do_proc_dointvec_conv;
2165
2166 for (; left && vleft--; i++, first=0) {
2167 if (write) {
2168 while (left) {
2169 char c;
2170 if (get_user(c, s))
2171 return -EFAULT;
2172 if (!isspace(c))
2173 break;
2174 left--;
2175 s++;
2176 }
2177 if (!left)
2178 break;
2179 neg = 0;
2180 len = left;
2181 if (len > sizeof(buf) - 1)
2182 len = sizeof(buf) - 1;
2183 if (copy_from_user(buf, s, len))
2184 return -EFAULT;
2185 buf[len] = 0;
2186 p = buf;
2187 if (*p == '-' && left > 1) {
2188 neg = 1;
bd9b0bac 2189 p++;
1da177e4
LT		 2190 }
2191 if (*p < '0' || *p > '9')
2192 break;
2193
2194 lval = simple_strtoul(p, &p, 0);
2195
2196 len = p-buf;
2197 if ((len < left) && *p && !isspace(*p))
2198 break;
2199 if (neg)
2200 val = -val;
2201 s += len;
2202 left -= len;
2203
2204 if (conv(&neg, &lval, i, 1, data))
2205 break;
2206 } else {
2207 p = buf;
2208 if (!first)
2209 *p++ = '\t';
2210
2211 if (conv(&neg, &lval, i, 0, data))
2212 break;
2213
2214 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2215 len = strlen(buf);
2216 if (len > left)
2217 len = left;
2218 if(copy_to_user(s, buf, len))
2219 return -EFAULT;
2220 left -= len;
2221 s += len;
2222 }
2223 }
2224
2225 if (!write && !first && left) {
2226 if(put_user('\n', s))
2227 return -EFAULT;
2228 left--, s++;
2229 }
2230 if (write) {
2231 while (left) {
2232 char c;
2233 if (get_user(c, s++))
2234 return -EFAULT;
2235 if (!isspace(c))
2236 break;
2237 left--;
2238 }
2239 }
2240 if (write && first)
2241 return -EINVAL;
2242 *lenp -= left;
2243 *ppos += *lenp;
2244 return 0;
2245#undef TMPBUFLEN
2246}
2247
d8217f07 2248static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2249 void __user *buffer, size_t *lenp, loff_t *ppos,
2250 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2251 int write, void *data),
2252 void *data)
2253{
2254 return __do_proc_dointvec(table->data, table, write, filp,
2255 buffer, lenp, ppos, conv, data);
2256}
2257
1da177e4
LT		 2258/**
2259 * proc_dointvec - read a vector of integers
2260 * @table: the sysctl table
2261 * @write: %TRUE if this is a write to the sysctl file
2262 * @filp: the file structure
2263 * @buffer: the user buffer
2264 * @lenp: the size of the user buffer
2265 * @ppos: file position
2266 *
2267 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2268 * values from/to the user buffer, treated as an ASCII string.
2269 *
2270 * Returns 0 on success.
2271 */
d8217f07 2272int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2273 void __user *buffer, size_t *lenp, loff_t *ppos)
2274{
2275 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2276 NULL,NULL);
2277}
2278
34f5a398 2279/*
25ddbb18
AK		 2280 * Taint values can only be increased
2281 * This means we can safely use a temporary.
34f5a398 2282 */
25ddbb18 2283static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2284 void __user *buffer, size_t *lenp, loff_t *ppos)
2285{
25ddbb18
AK		 2286 struct ctl_table t;
2287 unsigned long tmptaint = get_taint();
2288 int err;
34f5a398 2289
91fcd412 2290 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2291 return -EPERM;
2292
25ddbb18
AK		 2293 t = *table;
2294 t.data = &tmptaint;
2295 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2296 if (err < 0)
2297 return err;
2298
2299 if (write) {
2300 /*
2301 * Poor man's atomic or. Not worth adding a primitive
2302 * to everyone's atomic.h for this
2303 */
2304 int i;
2305 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2306 if ((tmptaint >> i) & 1)
2307 add_taint(i);
2308 }
2309 }
2310
2311 return err;
34f5a398
TT		 2312}
2313
1da177e4
LT		 2314struct do_proc_dointvec_minmax_conv_param {
2315 int *min;
2316 int *max;
2317};
2318
2319static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2320 int *valp,
2321 int write, void *data)
2322{
2323 struct do_proc_dointvec_minmax_conv_param *param = data;
2324 if (write) {
2325 int val = *negp ? -*lvalp : *lvalp;
2326 if ((param->min && *param->min > val) ||
2327 (param->max && *param->max < val))
2328 return -EINVAL;
2329 *valp = val;
2330 } else {
2331 int val = *valp;
2332 if (val < 0) {
2333 *negp = -1;
2334 *lvalp = (unsigned long)-val;
2335 } else {
2336 *negp = 0;
2337 *lvalp = (unsigned long)val;
2338 }
2339 }
2340 return 0;
2341}
2342
2343/**
2344 * proc_dointvec_minmax - read a vector of integers with min/max values
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 * This routine will ensure the values are within the range specified by
2356 * table->extra1 (min) and table->extra2 (max).
2357 *
2358 * Returns 0 on success.
2359 */
d8217f07 2360int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2361 void __user *buffer, size_t *lenp, loff_t *ppos)
2362{
2363 struct do_proc_dointvec_minmax_conv_param param = {
2364 .min = (int *) table->extra1,
2365 .max = (int *) table->extra2,
2366 };
2367 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2368 do_proc_dointvec_minmax_conv, &param);
2369}
2370
d8217f07 2371static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2372 struct file *filp,
2373 void __user *buffer,
2374 size_t *lenp, loff_t *ppos,
2375 unsigned long convmul,
2376 unsigned long convdiv)
2377{
2378#define TMPBUFLEN 21
2379 unsigned long *i, *min, *max, val;
2380 int vleft, first=1, neg;
2381 size_t len, left;
2382 char buf[TMPBUFLEN], *p;
2383 char __user *s = buffer;
2384
fcfbd547 2385 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2386 (*ppos && !write)) {
2387 *lenp = 0;
2388 return 0;
2389 }
2390
fcfbd547 2391 i = (unsigned long *) data;
1da177e4
LT		 2392 min = (unsigned long *) table->extra1;
2393 max = (unsigned long *) table->extra2;
2394 vleft = table->maxlen / sizeof(unsigned long);
2395 left = *lenp;
2396
2397 for (; left && vleft--; i++, min++, max++, first=0) {
2398 if (write) {
2399 while (left) {
2400 char c;
2401 if (get_user(c, s))
2402 return -EFAULT;
2403 if (!isspace(c))
2404 break;
2405 left--;
2406 s++;
2407 }
2408 if (!left)
2409 break;
2410 neg = 0;
2411 len = left;
2412 if (len > TMPBUFLEN-1)
2413 len = TMPBUFLEN-1;
2414 if (copy_from_user(buf, s, len))
2415 return -EFAULT;
2416 buf[len] = 0;
2417 p = buf;
2418 if (*p == '-' && left > 1) {
2419 neg = 1;
bd9b0bac 2420 p++;
1da177e4
LT		 2421 }
2422 if (*p < '0' || *p > '9')
2423 break;
2424 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2425 len = p-buf;
2426 if ((len < left) && *p && !isspace(*p))
2427 break;
2428 if (neg)
2429 val = -val;
2430 s += len;
2431 left -= len;
2432
2433 if(neg)
2434 continue;
2435 if ((min && val < *min) || (max && val > *max))
2436 continue;
2437 *i = val;
2438 } else {
2439 p = buf;
2440 if (!first)
2441 *p++ = '\t';
2442 sprintf(p, "%lu", convdiv * (*i) / convmul);
2443 len = strlen(buf);
2444 if (len > left)
2445 len = left;
2446 if(copy_to_user(s, buf, len))
2447 return -EFAULT;
2448 left -= len;
2449 s += len;
2450 }
2451 }
2452
2453 if (!write && !first && left) {
2454 if(put_user('\n', s))
2455 return -EFAULT;
2456 left--, s++;
2457 }
2458 if (write) {
2459 while (left) {
2460 char c;
2461 if (get_user(c, s++))
2462 return -EFAULT;
2463 if (!isspace(c))
2464 break;
2465 left--;
2466 }
2467 }
2468 if (write && first)
2469 return -EINVAL;
2470 *lenp -= left;
2471 *ppos += *lenp;
2472 return 0;
2473#undef TMPBUFLEN
2474}
2475
d8217f07 2476static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2477 struct file *filp,
2478 void __user *buffer,
2479 size_t *lenp, loff_t *ppos,
2480 unsigned long convmul,
2481 unsigned long convdiv)
2482{
2483 return __do_proc_doulongvec_minmax(table->data, table, write,
2484 filp, buffer, lenp, ppos, convmul, convdiv);
2485}
2486
1da177e4
LT		 2487/**
2488 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2489 * @table: the sysctl table
2490 * @write: %TRUE if this is a write to the sysctl file
2491 * @filp: the file structure
2492 * @buffer: the user buffer
2493 * @lenp: the size of the user buffer
2494 * @ppos: file position
2495 *
2496 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2497 * values from/to the user buffer, treated as an ASCII string.
2498 *
2499 * This routine will ensure the values are within the range specified by
2500 * table->extra1 (min) and table->extra2 (max).
2501 *
2502 * Returns 0 on success.
2503 */
d8217f07 2504int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2505 void __user *buffer, size_t *lenp, loff_t *ppos)
2506{
2507 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2508}
2509
2510/**
2511 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2512 * @table: the sysctl table
2513 * @write: %TRUE if this is a write to the sysctl file
2514 * @filp: the file structure
2515 * @buffer: the user buffer
2516 * @lenp: the size of the user buffer
2517 * @ppos: file position
2518 *
2519 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2520 * values from/to the user buffer, treated as an ASCII string. The values
2521 * are treated as milliseconds, and converted to jiffies when they are stored.
2522 *
2523 * This routine will ensure the values are within the range specified by
2524 * table->extra1 (min) and table->extra2 (max).
2525 *
2526 * Returns 0 on success.
2527 */
d8217f07 2528int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2529 struct file *filp,
2530 void __user *buffer,
2531 size_t *lenp, loff_t *ppos)
2532{
2533 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2534 lenp, ppos, HZ, 1000l);
2535}
2536
2537
2538static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2539 int *valp,
2540 int write, void *data)
2541{
2542 if (write) {
cba9f33d
BS		 2543 if (*lvalp > LONG_MAX / HZ)
2544 return 1;
1da177e4
LT		 2545 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2546 } else {
2547 int val = *valp;
2548 unsigned long lval;
2549 if (val < 0) {
2550 *negp = -1;
2551 lval = (unsigned long)-val;
2552 } else {
2553 *negp = 0;
2554 lval = (unsigned long)val;
2555 }
2556 *lvalp = lval / HZ;
2557 }
2558 return 0;
2559}
2560
2561static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2562 int *valp,
2563 int write, void *data)
2564{
2565 if (write) {
cba9f33d
BS		 2566 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2567 return 1;
1da177e4
LT		 2568 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2569 } else {
2570 int val = *valp;
2571 unsigned long lval;
2572 if (val < 0) {
2573 *negp = -1;
2574 lval = (unsigned long)-val;
2575 } else {
2576 *negp = 0;
2577 lval = (unsigned long)val;
2578 }
2579 *lvalp = jiffies_to_clock_t(lval);
2580 }
2581 return 0;
2582}
2583
2584static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2585 int *valp,
2586 int write, void *data)
2587{
2588 if (write) {
2589 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2590 } else {
2591 int val = *valp;
2592 unsigned long lval;
2593 if (val < 0) {
2594 *negp = -1;
2595 lval = (unsigned long)-val;
2596 } else {
2597 *negp = 0;
2598 lval = (unsigned long)val;
2599 }
2600 *lvalp = jiffies_to_msecs(lval);
2601 }
2602 return 0;
2603}
2604
2605/**
2606 * proc_dointvec_jiffies - read a vector of integers as seconds
2607 * @table: the sysctl table
2608 * @write: %TRUE if this is a write to the sysctl file
2609 * @filp: the file structure
2610 * @buffer: the user buffer
2611 * @lenp: the size of the user buffer
2612 * @ppos: file position
2613 *
2614 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2615 * values from/to the user buffer, treated as an ASCII string.
2616 * The values read are assumed to be in seconds, and are converted into
2617 * jiffies.
2618 *
2619 * Returns 0 on success.
2620 */
d8217f07 2621int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2622 void __user *buffer, size_t *lenp, loff_t *ppos)
2623{
2624 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2625 do_proc_dointvec_jiffies_conv,NULL);
2626}
2627
2628/**
2629 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2630 * @table: the sysctl table
2631 * @write: %TRUE if this is a write to the sysctl file
2632 * @filp: the file structure
2633 * @buffer: the user buffer
2634 * @lenp: the size of the user buffer
1e5d5331 2635 * @ppos: pointer to the file position
1da177e4
LT		 2636 *
2637 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2638 * values from/to the user buffer, treated as an ASCII string.
2639 * The values read are assumed to be in 1/USER_HZ seconds, and
2640 * are converted into jiffies.
2641 *
2642 * Returns 0 on success.
2643 */
d8217f07 2644int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2645 void __user *buffer, size_t *lenp, loff_t *ppos)
2646{
2647 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2648 do_proc_dointvec_userhz_jiffies_conv,NULL);
2649}
2650
2651/**
2652 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2653 * @table: the sysctl table
2654 * @write: %TRUE if this is a write to the sysctl file
2655 * @filp: the file structure
2656 * @buffer: the user buffer
2657 * @lenp: the size of the user buffer
67be2dd1
MW		 2658 * @ppos: file position
2659 * @ppos: the current position in the file
1da177e4
LT		 2660 *
2661 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2662 * values from/to the user buffer, treated as an ASCII string.
2663 * The values read are assumed to be in 1/1000 seconds, and
2664 * are converted into jiffies.
2665 *
2666 * Returns 0 on success.
2667 */
d8217f07 2668int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2669 void __user *buffer, size_t *lenp, loff_t *ppos)
2670{
2671 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2672 do_proc_dointvec_ms_jiffies_conv, NULL);
2673}
2674
d8217f07 2675static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2676 void __user *buffer, size_t *lenp, loff_t *ppos)
2677{
2678 struct pid *new_pid;
2679 pid_t tmp;
2680 int r;
2681
6c5f3e7b 2682 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2683
2684 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2685 lenp, ppos, NULL, NULL);
2686 if (r || !write)
2687 return r;
2688
2689 new_pid = find_get_pid(tmp);
2690 if (!new_pid)
2691 return -ESRCH;
2692
2693 put_pid(xchg(&cad_pid, new_pid));
2694 return 0;
2695}
2696
1da177e4
LT		 2697#else /* CONFIG_PROC_FS */
2698
d8217f07 2699int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701{
2702 return -ENOSYS;
2703}
2704
d8217f07 2705int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2706 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2707{
2708 return -ENOSYS;
2709}
2710
d8217f07 2711int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2712 void __user *buffer, size_t *lenp, loff_t *ppos)
2713{
2714 return -ENOSYS;
2715}
2716
d8217f07 2717int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2718 void __user *buffer, size_t *lenp, loff_t *ppos)
2719{
2720 return -ENOSYS;
2721}
2722
d8217f07 2723int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2724 void __user *buffer, size_t *lenp, loff_t *ppos)
2725{
2726 return -ENOSYS;
2727}
2728
d8217f07 2729int proc_dointvec_ms_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 -ENOSYS;
2733}
2734
d8217f07 2735int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2736 void __user *buffer, size_t *lenp, loff_t *ppos)
2737{
2738 return -ENOSYS;
2739}
2740
d8217f07 2741int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2742 struct file *filp,
2743 void __user *buffer,
2744 size_t *lenp, loff_t *ppos)
2745{
2746 return -ENOSYS;
2747}
2748
2749
2750#endif /* CONFIG_PROC_FS */
2751
2752
b89a8171 2753#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2754/*
2755 * General sysctl support routines
2756 */
2757
49a0c458 2758/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2759int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2760 void __user *oldval, size_t __user *oldlenp,
2761 void __user *newval, size_t newlen)
2762{
2763 size_t len;
2764
2765 /* Get out of I don't have a variable */
2766 if (!table->data || !table->maxlen)
2767 return -ENOTDIR;
2768
2769 if (oldval && oldlenp) {
2770 if (get_user(len, oldlenp))
2771 return -EFAULT;
2772 if (len) {
2773 if (len > table->maxlen)
2774 len = table->maxlen;
2775 if (copy_to_user(oldval, table->data, len))
2776 return -EFAULT;
2777 if (put_user(len, oldlenp))
2778 return -EFAULT;
2779 }
2780 }
2781
2782 if (newval && newlen) {
2783 if (newlen > table->maxlen)
2784 newlen = table->maxlen;
2785
2786 if (copy_from_user(table->data, newval, newlen))
2787 return -EFAULT;
2788 }
2789 return 1;
2790}
2791
1da177e4 2792/* The generic string strategy routine: */
f221e726 2793int sysctl_string(struct ctl_table *table,
1da177e4 2794 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2795 void __user *newval, size_t newlen)
1da177e4 2796{
1da177e4
LT		 2797 if (!table->data || !table->maxlen)
2798 return -ENOTDIR;
2799
2800 if (oldval && oldlenp) {
de9e007d
LT		 2801 size_t bufsize;
2802 if (get_user(bufsize, oldlenp))
1da177e4 2803 return -EFAULT;
de9e007d
LT		 2804 if (bufsize) {
2805 size_t len = strlen(table->data), copied;
2806
2807 /* This shouldn't trigger for a well-formed sysctl */
2808 if (len > table->maxlen)
1da177e4 2809 len = table->maxlen;
de9e007d
LT		 2810
2811 /* Copy up to a max of bufsize-1 bytes of the string */
2812 copied = (len >= bufsize) ? bufsize - 1 : len;
2813
2814 if (copy_to_user(oldval, table->data, copied) ||
2815 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2816 return -EFAULT;
de9e007d 2817 if (put_user(len, oldlenp))
1da177e4
LT		 2818 return -EFAULT;
2819 }
2820 }
2821 if (newval && newlen) {
de9e007d 2822 size_t len = newlen;
1da177e4
LT		 2823 if (len > table->maxlen)
2824 len = table->maxlen;
2825 if(copy_from_user(table->data, newval, len))
2826 return -EFAULT;
2827 if (len == table->maxlen)
2828 len--;
2829 ((char *) table->data)[len] = 0;
2830 }
82c9df82 2831 return 1;
1da177e4
LT		 2832}
2833
2834/*
2835 * This function makes sure that all of the integers in the vector
2836 * are between the minimum and maximum values given in the arrays
2837 * table->extra1 and table->extra2, respectively.
2838 */
f221e726 2839int sysctl_intvec(struct ctl_table *table,
1da177e4 2840 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2841 void __user *newval, size_t newlen)
1da177e4
LT		 2842{
2843
2844 if (newval && newlen) {
2845 int __user *vec = (int __user *) newval;
2846 int *min = (int *) table->extra1;
2847 int *max = (int *) table->extra2;
2848 size_t length;
2849 int i;
2850
2851 if (newlen % sizeof(int) != 0)
2852 return -EINVAL;
2853
2854 if (!table->extra1 && !table->extra2)
2855 return 0;
2856
2857 if (newlen > table->maxlen)
2858 newlen = table->maxlen;
2859 length = newlen / sizeof(int);
2860
2861 for (i = 0; i < length; i++) {
2862 int value;
2863 if (get_user(value, vec + i))
2864 return -EFAULT;
2865 if (min && value < min[i])
2866 return -EINVAL;
2867 if (max && value > max[i])
2868 return -EINVAL;
2869 }
2870 }
2871 return 0;
2872}
2873
2874/* Strategy function to convert jiffies to seconds */
f221e726 2875int sysctl_jiffies(struct ctl_table *table,
1da177e4 2876 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2877 void __user *newval, size_t newlen)
1da177e4 2878{
3ee75ac3 2879 if (oldval && oldlenp) {
1da177e4 2880 size_t olen;
3ee75ac3
AD		 2881
2882 if (get_user(olen, oldlenp))
2883 return -EFAULT;
2884 if (olen) {
2885 int val;
2886
2887 if (olen < sizeof(int))
2888 return -EINVAL;
2889
2890 val = *(int *)(table->data) / HZ;
2891 if (put_user(val, (int __user *)oldval))
2892 return -EFAULT;
2893 if (put_user(sizeof(int), oldlenp))
1da177e4 2894 return -EFAULT;
1da177e4 2895 }
1da177e4
LT		 2896 }
2897 if (newval && newlen) {
2898 int new;
2899 if (newlen != sizeof(int))
2900 return -EINVAL;
2901 if (get_user(new, (int __user *)newval))
2902 return -EFAULT;
2903 *(int *)(table->data) = new*HZ;
2904 }
2905 return 1;
2906}
2907
2908/* Strategy function to convert jiffies to seconds */
f221e726 2909int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 2910 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2911 void __user *newval, size_t newlen)
1da177e4 2912{
3ee75ac3 2913 if (oldval && oldlenp) {
1da177e4 2914 size_t olen;
3ee75ac3
AD		 2915
2916 if (get_user(olen, oldlenp))
2917 return -EFAULT;
2918 if (olen) {
2919 int val;
2920
2921 if (olen < sizeof(int))
2922 return -EINVAL;
2923
2924 val = jiffies_to_msecs(*(int *)(table->data));
2925 if (put_user(val, (int __user *)oldval))
2926 return -EFAULT;
2927 if (put_user(sizeof(int), oldlenp))
1da177e4 2928 return -EFAULT;
1da177e4 2929 }
1da177e4
LT		 2930 }
2931 if (newval && newlen) {
2932 int new;
2933 if (newlen != sizeof(int))
2934 return -EINVAL;
2935 if (get_user(new, (int __user *)newval))
2936 return -EFAULT;
2937 *(int *)(table->data) = msecs_to_jiffies(new);
2938 }
2939 return 1;
2940}
2941
c4b8b769 2942
c4b8b769 2943
b89a8171 2944#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 2945
2946
2947asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2948{
0e009be8 2949 struct __sysctl_args tmp;
7058cb02 2950 int error;
0e009be8 2951
0e009be8
EB		 2952 if (copy_from_user(&tmp, args, sizeof(tmp)))
2953 return -EFAULT;
0e009be8 2954
7058cb02 2955 error = deprecated_sysctl_warning(&tmp);
b89a8171 2956
7058cb02
EB		 2957 /* If no error reading the parameters then just -ENOSYS ... */
2958 if (!error)
2959 error = -ENOSYS;
2960
2961 return error;
1da177e4
LT		 2962}
2963
f221e726 2964int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2965 void __user *oldval, size_t __user *oldlenp,
2966 void __user *newval, size_t newlen)
2967{
2968 return -ENOSYS;
2969}
2970
f221e726 2971int sysctl_string(struct ctl_table *table,
1da177e4 2972 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2973 void __user *newval, size_t newlen)
1da177e4
LT		 2974{
2975 return -ENOSYS;
2976}
2977
f221e726 2978int sysctl_intvec(struct ctl_table *table,
1da177e4 2979 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2980 void __user *newval, size_t newlen)
1da177e4
LT		 2981{
2982 return -ENOSYS;
2983}
2984
f221e726 2985int sysctl_jiffies(struct ctl_table *table,
1da177e4 2986 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2987 void __user *newval, size_t newlen)
1da177e4
LT		 2988{
2989 return -ENOSYS;
2990}
2991
f221e726 2992int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 2993 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2994 void __user *newval, size_t newlen)
1da177e4
LT		 2995{
2996 return -ENOSYS;
2997}
2998
b89a8171 2999#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3000
7058cb02
EB		 3001static int deprecated_sysctl_warning(struct __sysctl_args *args)
3002{
3003 static int msg_count;
3004 int name[CTL_MAXNAME];
3005 int i;
3006
6fc48af8
TH		 3007 /* Check args->nlen. */
3008 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3009 return -ENOTDIR;
3010
7058cb02
EB		 3011 /* Read in the sysctl name for better debug message logging */
3012 for (i = 0; i < args->nlen; i++)
3013 if (get_user(name[i], args->name + i))
3014 return -EFAULT;
3015
3016 /* Ignore accesses to kernel.version */
3017 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3018 return 0;
3019
3020 if (msg_count < 5) {
3021 msg_count++;
3022 printk(KERN_INFO
3023 "warning: process `%s' used the deprecated sysctl "
3024 "system call with ", current->comm);
3025 for (i = 0; i < args->nlen; i++)
3026 printk("%d.", name[i]);
3027 printk("\n");
3028 }
3029 return 0;
3030}
3031
1da177e4
LT		 3032/*
3033 * No sense putting this after each symbol definition, twice,
3034 * exception granted :-)
3035 */
3036EXPORT_SYMBOL(proc_dointvec);
3037EXPORT_SYMBOL(proc_dointvec_jiffies);
3038EXPORT_SYMBOL(proc_dointvec_minmax);
3039EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3040EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3041EXPORT_SYMBOL(proc_dostring);
3042EXPORT_SYMBOL(proc_doulongvec_minmax);
3043EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3044EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3045EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3046EXPORT_SYMBOL(sysctl_intvec);
3047EXPORT_SYMBOL(sysctl_jiffies);
3048EXPORT_SYMBOL(sysctl_ms_jiffies);
3049EXPORT_SYMBOL(sysctl_string);
49a0c458 3050EXPORT_SYMBOL(sysctl_data);
1da177e4 3051EXPORT_SYMBOL(unregister_sysctl_table);
Linux 6.x block layer and io_uring tree(s)