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[IA64] Turn on CONFIG_HAVE_UNSTABLE_CLOCK
[GitHub/mt8127/android_kernel_alcatel_ttab.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;
dd8632a1
PM		 85#ifndef CONFIG_MMU
86extern int sysctl_nr_trim_pages;
87#endif
31a72bce
PM		 88#ifdef CONFIG_RCU_TORTURE_TEST
89extern int rcutorture_runnable;
90#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 91
c4f3b63f 92/* Constants used for minimum and maximum */
195cf453 93#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 94static int sixty = 60;
9383d967 95static int neg_one = -1;
c4f3b63f
RT		 96#endif
97
bfcd17a6 98#if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
c4f3b63f
RT		 99static int two = 2;
100#endif
101
102static int zero;
2da02997 103static int one = 1;
c4f3b63f
RT		 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
0871420f
DM		 124#ifdef CONFIG_SPARC64
125extern int sysctl_tsb_ratio;
126#endif
127
1da177e4
LT		 128#ifdef __hppa__
129extern int pwrsw_enabled;
130extern int unaligned_enabled;
131#endif
132
347a8dc3 133#ifdef CONFIG_S390
1da177e4
LT		 134#ifdef CONFIG_MATHEMU
135extern int sysctl_ieee_emulation_warnings;
136#endif
137extern int sysctl_userprocess_debug;
951f22d5 138extern int spin_retry;
1da177e4
LT		 139#endif
140
1da177e4
LT		 141#ifdef CONFIG_BSD_PROCESS_ACCT
142extern int acct_parm[];
143#endif
144
d2b176ed
JS		 145#ifdef CONFIG_IA64
146extern int no_unaligned_warning;
147#endif
148
23f78d4a
IM		 149#ifdef CONFIG_RT_MUTEXES
150extern int max_lock_depth;
151#endif
152
d6f8ff73 153#ifdef CONFIG_PROC_SYSCTL
d8217f07 154static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 155 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 156static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 157 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 158#endif
9ec52099 159
d8217f07 160static struct ctl_table root_table[];
e51b6ba0
EB		 161static struct ctl_table_root sysctl_table_root;
162static struct ctl_table_header root_table_header = {
b380b0d4 163 .count = 1,
e51b6ba0 164 .ctl_table = root_table,
73455092 165 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 166 .root = &sysctl_table_root,
73455092 167 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 168};
169static struct ctl_table_root sysctl_table_root = {
170 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 171 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 172};
1da177e4 173
d8217f07
EB		 174static struct ctl_table kern_table[];
175static struct ctl_table vm_table[];
176static struct ctl_table fs_table[];
177static struct ctl_table debug_table[];
178static struct ctl_table dev_table[];
179extern struct ctl_table random_table[];
2d9048e2 180#ifdef CONFIG_INOTIFY_USER
d8217f07 181extern struct ctl_table inotify_table[];
0399cb08 182#endif
7ef9964e
DL		 183#ifdef CONFIG_EPOLL
184extern struct ctl_table epoll_table[];
185#endif
1da177e4
LT		 186
187#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
188int sysctl_legacy_va_layout;
189#endif
190
f20786ff
PZ		 191extern int prove_locking;
192extern int lock_stat;
9bc9a6bd 193
1da177e4
LT		 194/* The default sysctl tables: */
195
d8217f07 196static struct ctl_table root_table[] = {
1da177e4
LT		 197 {
198 .ctl_name = CTL_KERN,
199 .procname = "kernel",
200 .mode = 0555,
201 .child = kern_table,
202 },
203 {
204 .ctl_name = CTL_VM,
205 .procname = "vm",
206 .mode = 0555,
207 .child = vm_table,
208 },
1da177e4
LT		 209 {
210 .ctl_name = CTL_FS,
211 .procname = "fs",
212 .mode = 0555,
213 .child = fs_table,
214 },
215 {
216 .ctl_name = CTL_DEBUG,
217 .procname = "debug",
218 .mode = 0555,
219 .child = debug_table,
220 },
221 {
222 .ctl_name = CTL_DEV,
223 .procname = "dev",
224 .mode = 0555,
225 .child = dev_table,
226 },
2be7fe07
AM		 227/*
228 * NOTE: do not add new entries to this table unless you have read
229 * Documentation/sysctl/ctl_unnumbered.txt
230 */
1da177e4
LT		 231 { .ctl_name = 0 }
232};
233
77e54a1f 234#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 235static int min_sched_granularity_ns = 100000; /* 100 usecs */
236static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
237static int min_wakeup_granularity_ns; /* 0 usecs */
238static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 239#endif
240
d8217f07 241static struct ctl_table kern_table[] = {
77e54a1f
IM		 242#ifdef CONFIG_SCHED_DEBUG
243 {
244 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 245 .procname = "sched_min_granularity_ns",
246 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 247 .maxlen = sizeof(unsigned int),
248 .mode = 0644,
b2be5e96
PZ		 249 .proc_handler = &sched_nr_latency_handler,
250 .strategy = &sysctl_intvec,
251 .extra1 = &min_sched_granularity_ns,
252 .extra2 = &max_sched_granularity_ns,
77e54a1f 253 },
21805085
PZ		 254 {
255 .ctl_name = CTL_UNNUMBERED,
256 .procname = "sched_latency_ns",
257 .data = &sysctl_sched_latency,
258 .maxlen = sizeof(unsigned int),
259 .mode = 0644,
b2be5e96 260 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 261 .strategy = &sysctl_intvec,
262 .extra1 = &min_sched_granularity_ns,
263 .extra2 = &max_sched_granularity_ns,
264 },
77e54a1f
IM		 265 {
266 .ctl_name = CTL_UNNUMBERED,
267 .procname = "sched_wakeup_granularity_ns",
268 .data = &sysctl_sched_wakeup_granularity,
269 .maxlen = sizeof(unsigned int),
270 .mode = 0644,
271 .proc_handler = &proc_dointvec_minmax,
272 .strategy = &sysctl_intvec,
77e54a1f
IM		 273 .extra1 = &min_wakeup_granularity_ns,
274 .extra2 = &max_wakeup_granularity_ns,
275 },
2398f2c6
PZ		 276 {
277 .ctl_name = CTL_UNNUMBERED,
278 .procname = "sched_shares_ratelimit",
279 .data = &sysctl_sched_shares_ratelimit,
280 .maxlen = sizeof(unsigned int),
281 .mode = 0644,
282 .proc_handler = &proc_dointvec,
283 },
ffda12a1
PZ		 284 {
285 .ctl_name = CTL_UNNUMBERED,
286 .procname = "sched_shares_thresh",
287 .data = &sysctl_sched_shares_thresh,
288 .maxlen = sizeof(unsigned int),
289 .mode = 0644,
290 .proc_handler = &proc_dointvec_minmax,
291 .strategy = &sysctl_intvec,
292 .extra1 = &zero,
293 },
77e54a1f
IM		 294 {
295 .ctl_name = CTL_UNNUMBERED,
296 .procname = "sched_child_runs_first",
297 .data = &sysctl_sched_child_runs_first,
298 .maxlen = sizeof(unsigned int),
299 .mode = 0644,
300 .proc_handler = &proc_dointvec,
301 },
1fc84aaa
PZ		 302 {
303 .ctl_name = CTL_UNNUMBERED,
304 .procname = "sched_features",
305 .data = &sysctl_sched_features,
306 .maxlen = sizeof(unsigned int),
307 .mode = 0644,
308 .proc_handler = &proc_dointvec,
309 },
da84d961
IM		 310 {
311 .ctl_name = CTL_UNNUMBERED,
312 .procname = "sched_migration_cost",
313 .data = &sysctl_sched_migration_cost,
314 .maxlen = sizeof(unsigned int),
315 .mode = 0644,
316 .proc_handler = &proc_dointvec,
317 },
b82d9fdd
PZ		 318 {
319 .ctl_name = CTL_UNNUMBERED,
320 .procname = "sched_nr_migrate",
321 .data = &sysctl_sched_nr_migrate,
322 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 323 .mode = 0644,
324 .proc_handler = &proc_dointvec,
325 },
1fc84aaa 326#endif
9f0c1e56
PZ		 327 {
328 .ctl_name = CTL_UNNUMBERED,
329 .procname = "sched_rt_period_us",
330 .data = &sysctl_sched_rt_period,
331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
d0b27fa7 333 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 334 },
335 {
336 .ctl_name = CTL_UNNUMBERED,
337 .procname = "sched_rt_runtime_us",
338 .data = &sysctl_sched_rt_runtime,
339 .maxlen = sizeof(int),
340 .mode = 0644,
d0b27fa7 341 .proc_handler = &sched_rt_handler,
9f0c1e56 342 },
1799e35d
IM		 343 {
344 .ctl_name = CTL_UNNUMBERED,
345 .procname = "sched_compat_yield",
346 .data = &sysctl_sched_compat_yield,
347 .maxlen = sizeof(unsigned int),
348 .mode = 0644,
349 .proc_handler = &proc_dointvec,
350 },
f20786ff
PZ		 351#ifdef CONFIG_PROVE_LOCKING
352 {
353 .ctl_name = CTL_UNNUMBERED,
354 .procname = "prove_locking",
355 .data = &prove_locking,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = &proc_dointvec,
359 },
360#endif
361#ifdef CONFIG_LOCK_STAT
362 {
363 .ctl_name = CTL_UNNUMBERED,
364 .procname = "lock_stat",
365 .data = &lock_stat,
366 .maxlen = sizeof(int),
367 .mode = 0644,
368 .proc_handler = &proc_dointvec,
369 },
77e54a1f 370#endif
1da177e4
LT		 371 {
372 .ctl_name = KERN_PANIC,
373 .procname = "panic",
374 .data = &panic_timeout,
375 .maxlen = sizeof(int),
376 .mode = 0644,
377 .proc_handler = &proc_dointvec,
378 },
379 {
380 .ctl_name = KERN_CORE_USES_PID,
381 .procname = "core_uses_pid",
382 .data = &core_uses_pid,
383 .maxlen = sizeof(int),
384 .mode = 0644,
385 .proc_handler = &proc_dointvec,
386 },
387 {
388 .ctl_name = KERN_CORE_PATTERN,
389 .procname = "core_pattern",
390 .data = core_pattern,
71ce92f3 391 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 392 .mode = 0644,
393 .proc_handler = &proc_dostring,
394 .strategy = &sysctl_string,
395 },
34f5a398 396#ifdef CONFIG_PROC_SYSCTL
1da177e4 397 {
1da177e4 398 .procname = "tainted",
25ddbb18 399 .maxlen = sizeof(long),
34f5a398 400 .mode = 0644,
25ddbb18 401 .proc_handler = &proc_taint,
1da177e4 402 },
34f5a398 403#endif
9745512c
AV		 404#ifdef CONFIG_LATENCYTOP
405 {
406 .procname = "latencytop",
407 .data = &latencytop_enabled,
408 .maxlen = sizeof(int),
409 .mode = 0644,
410 .proc_handler = &proc_dointvec,
411 },
412#endif
1da177e4
LT		 413#ifdef CONFIG_BLK_DEV_INITRD
414 {
415 .ctl_name = KERN_REALROOTDEV,
416 .procname = "real-root-dev",
417 .data = &real_root_dev,
418 .maxlen = sizeof(int),
419 .mode = 0644,
420 .proc_handler = &proc_dointvec,
421 },
422#endif
45807a1d
IM		 423 {
424 .ctl_name = CTL_UNNUMBERED,
425 .procname = "print-fatal-signals",
426 .data = &print_fatal_signals,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = &proc_dointvec,
430 },
72c57ed5 431#ifdef CONFIG_SPARC
1da177e4
LT		 432 {
433 .ctl_name = KERN_SPARC_REBOOT,
434 .procname = "reboot-cmd",
435 .data = reboot_command,
436 .maxlen = 256,
437 .mode = 0644,
438 .proc_handler = &proc_dostring,
439 .strategy = &sysctl_string,
440 },
441 {
442 .ctl_name = KERN_SPARC_STOP_A,
443 .procname = "stop-a",
444 .data = &stop_a_enabled,
445 .maxlen = sizeof (int),
446 .mode = 0644,
447 .proc_handler = &proc_dointvec,
448 },
449 {
450 .ctl_name = KERN_SPARC_SCONS_PWROFF,
451 .procname = "scons-poweroff",
452 .data = &scons_pwroff,
453 .maxlen = sizeof (int),
454 .mode = 0644,
455 .proc_handler = &proc_dointvec,
456 },
457#endif
0871420f
DM		 458#ifdef CONFIG_SPARC64
459 {
460 .ctl_name = CTL_UNNUMBERED,
461 .procname = "tsb-ratio",
462 .data = &sysctl_tsb_ratio,
463 .maxlen = sizeof (int),
464 .mode = 0644,
465 .proc_handler = &proc_dointvec,
466 },
467#endif
1da177e4
LT		 468#ifdef __hppa__
469 {
470 .ctl_name = KERN_HPPA_PWRSW,
471 .procname = "soft-power",
472 .data = &pwrsw_enabled,
473 .maxlen = sizeof (int),
474 .mode = 0644,
475 .proc_handler = &proc_dointvec,
476 },
477 {
478 .ctl_name = KERN_HPPA_UNALIGNED,
479 .procname = "unaligned-trap",
480 .data = &unaligned_enabled,
481 .maxlen = sizeof (int),
482 .mode = 0644,
483 .proc_handler = &proc_dointvec,
484 },
485#endif
486 {
487 .ctl_name = KERN_CTLALTDEL,
488 .procname = "ctrl-alt-del",
489 .data = &C_A_D,
490 .maxlen = sizeof(int),
491 .mode = 0644,
492 .proc_handler = &proc_dointvec,
493 },
606576ce 494#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 495 {
496 .ctl_name = CTL_UNNUMBERED,
497 .procname = "ftrace_enabled",
498 .data = &ftrace_enabled,
499 .maxlen = sizeof(int),
500 .mode = 0644,
501 .proc_handler = &ftrace_enable_sysctl,
502 },
503#endif
f38f1d2a
SR		 504#ifdef CONFIG_STACK_TRACER
505 {
506 .ctl_name = CTL_UNNUMBERED,
507 .procname = "stack_tracer_enabled",
508 .data = &stack_tracer_enabled,
509 .maxlen = sizeof(int),
510 .mode = 0644,
511 .proc_handler = &stack_trace_sysctl,
512 },
513#endif
944ac425
SR		 514#ifdef CONFIG_TRACING
515 {
516 .ctl_name = CTL_UNNUMBERED,
3299b4dd 517 .procname = "ftrace_dump_on_oops",
944ac425
SR		 518 .data = &ftrace_dump_on_oops,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = &proc_dointvec,
522 },
523#endif
a1ef5adb 524#ifdef CONFIG_MODULES
1da177e4
LT		 525 {
526 .ctl_name = KERN_MODPROBE,
527 .procname = "modprobe",
528 .data = &modprobe_path,
529 .maxlen = KMOD_PATH_LEN,
530 .mode = 0644,
531 .proc_handler = &proc_dostring,
532 .strategy = &sysctl_string,
533 },
534#endif
57ae2508 535#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 536 {
537 .ctl_name = KERN_HOTPLUG,
538 .procname = "hotplug",
312c004d
KS		 539 .data = &uevent_helper,
540 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 541 .mode = 0644,
542 .proc_handler = &proc_dostring,
543 .strategy = &sysctl_string,
544 },
545#endif
546#ifdef CONFIG_CHR_DEV_SG
547 {
548 .ctl_name = KERN_SG_BIG_BUFF,
549 .procname = "sg-big-buff",
550 .data = &sg_big_buff,
551 .maxlen = sizeof (int),
552 .mode = 0444,
553 .proc_handler = &proc_dointvec,
554 },
555#endif
556#ifdef CONFIG_BSD_PROCESS_ACCT
557 {
558 .ctl_name = KERN_ACCT,
559 .procname = "acct",
560 .data = &acct_parm,
561 .maxlen = 3*sizeof(int),
562 .mode = 0644,
563 .proc_handler = &proc_dointvec,
564 },
565#endif
1da177e4
LT		 566#ifdef CONFIG_MAGIC_SYSRQ
567 {
568 .ctl_name = KERN_SYSRQ,
569 .procname = "sysrq",
5d6f647f 570 .data = &__sysrq_enabled,
1da177e4
LT		 571 .maxlen = sizeof (int),
572 .mode = 0644,
573 .proc_handler = &proc_dointvec,
574 },
575#endif
d6f8ff73 576#ifdef CONFIG_PROC_SYSCTL
1da177e4 577 {
1da177e4 578 .procname = "cad_pid",
9ec52099 579 .data = NULL,
1da177e4
LT		 580 .maxlen = sizeof (int),
581 .mode = 0600,
9ec52099 582 .proc_handler = &proc_do_cad_pid,
1da177e4 583 },
d6f8ff73 584#endif
1da177e4
LT		 585 {
586 .ctl_name = KERN_MAX_THREADS,
587 .procname = "threads-max",
588 .data = &max_threads,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = &proc_dointvec,
592 },
593 {
594 .ctl_name = KERN_RANDOM,
595 .procname = "random",
596 .mode = 0555,
597 .child = random_table,
598 },
1da177e4
LT		 599 {
600 .ctl_name = KERN_OVERFLOWUID,
601 .procname = "overflowuid",
602 .data = &overflowuid,
603 .maxlen = sizeof(int),
604 .mode = 0644,
605 .proc_handler = &proc_dointvec_minmax,
606 .strategy = &sysctl_intvec,
607 .extra1 = &minolduid,
608 .extra2 = &maxolduid,
609 },
610 {
611 .ctl_name = KERN_OVERFLOWGID,
612 .procname = "overflowgid",
613 .data = &overflowgid,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 .proc_handler = &proc_dointvec_minmax,
617 .strategy = &sysctl_intvec,
618 .extra1 = &minolduid,
619 .extra2 = &maxolduid,
620 },
347a8dc3 621#ifdef CONFIG_S390
1da177e4
LT		 622#ifdef CONFIG_MATHEMU
623 {
624 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
625 .procname = "ieee_emulation_warnings",
626 .data = &sysctl_ieee_emulation_warnings,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = &proc_dointvec,
630 },
1da177e4
LT		 631#endif
632 {
633 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
634 .procname = "userprocess_debug",
635 .data = &sysctl_userprocess_debug,
636 .maxlen = sizeof(int),
637 .mode = 0644,
638 .proc_handler = &proc_dointvec,
639 },
640#endif
641 {
642 .ctl_name = KERN_PIDMAX,
643 .procname = "pid_max",
644 .data = &pid_max,
645 .maxlen = sizeof (int),
646 .mode = 0644,
647 .proc_handler = &proc_dointvec_minmax,
648 .strategy = sysctl_intvec,
649 .extra1 = &pid_max_min,
650 .extra2 = &pid_max_max,
651 },
652 {
653 .ctl_name = KERN_PANIC_ON_OOPS,
654 .procname = "panic_on_oops",
655 .data = &panic_on_oops,
656 .maxlen = sizeof(int),
657 .mode = 0644,
658 .proc_handler = &proc_dointvec,
659 },
7ef3d2fd
JP		 660#if defined CONFIG_PRINTK
661 {
662 .ctl_name = KERN_PRINTK,
663 .procname = "printk",
664 .data = &console_loglevel,
665 .maxlen = 4*sizeof(int),
666 .mode = 0644,
667 .proc_handler = &proc_dointvec,
668 },
1da177e4
LT		 669 {
670 .ctl_name = KERN_PRINTK_RATELIMIT,
671 .procname = "printk_ratelimit",
717115e1 672 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 673 .maxlen = sizeof(int),
674 .mode = 0644,
675 .proc_handler = &proc_dointvec_jiffies,
676 .strategy = &sysctl_jiffies,
677 },
678 {
679 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
680 .procname = "printk_ratelimit_burst",
717115e1 681 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 682 .maxlen = sizeof(int),
683 .mode = 0644,
684 .proc_handler = &proc_dointvec,
685 },
7ef3d2fd 686#endif
1da177e4
LT		 687 {
688 .ctl_name = KERN_NGROUPS_MAX,
689 .procname = "ngroups_max",
690 .data = &ngroups_max,
691 .maxlen = sizeof (int),
692 .mode = 0444,
693 .proc_handler = &proc_dointvec,
694 },
695#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
696 {
697 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
698 .procname = "unknown_nmi_panic",
699 .data = &unknown_nmi_panic,
700 .maxlen = sizeof (int),
701 .mode = 0644,
2fbe7b25 702 .proc_handler = &proc_dointvec,
1da177e4 703 },
407984f1 704 {
407984f1
DZ		 705 .procname = "nmi_watchdog",
706 .data = &nmi_watchdog_enabled,
707 .maxlen = sizeof (int),
708 .mode = 0644,
709 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 710 },
711#endif
712#if defined(CONFIG_X86)
8da5adda
DZ		 713 {
714 .ctl_name = KERN_PANIC_ON_NMI,
715 .procname = "panic_on_unrecovered_nmi",
716 .data = &panic_on_unrecovered_nmi,
717 .maxlen = sizeof(int),
718 .mode = 0644,
719 .proc_handler = &proc_dointvec,
720 },
1da177e4
LT		 721 {
722 .ctl_name = KERN_BOOTLOADER_TYPE,
723 .procname = "bootloader_type",
724 .data = &bootloader_type,
725 .maxlen = sizeof (int),
726 .mode = 0444,
727 .proc_handler = &proc_dointvec,
728 },
0741f4d2
CE		 729 {
730 .ctl_name = CTL_UNNUMBERED,
731 .procname = "kstack_depth_to_print",
732 .data = &kstack_depth_to_print,
733 .maxlen = sizeof(int),
734 .mode = 0644,
735 .proc_handler = &proc_dointvec,
736 },
6e7c4025
IM		 737 {
738 .ctl_name = CTL_UNNUMBERED,
739 .procname = "io_delay_type",
740 .data = &io_delay_type,
741 .maxlen = sizeof(int),
742 .mode = 0644,
743 .proc_handler = &proc_dointvec,
744 },
1da177e4 745#endif
7a9166e3 746#if defined(CONFIG_MMU)
1da177e4
LT		 747 {
748 .ctl_name = KERN_RANDOMIZE,
749 .procname = "randomize_va_space",
750 .data = &randomize_va_space,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = &proc_dointvec,
754 },
7a9166e3 755#endif
0152fb37 756#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 757 {
758 .ctl_name = KERN_SPIN_RETRY,
759 .procname = "spin_retry",
760 .data = &spin_retry,
761 .maxlen = sizeof (int),
762 .mode = 0644,
763 .proc_handler = &proc_dointvec,
764 },
c255d844 765#endif
673d5b43 766#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 767 {
c255d844 768 .procname = "acpi_video_flags",
77afcf78 769 .data = &acpi_realmode_flags,
c255d844
PM		 770 .maxlen = sizeof (unsigned long),
771 .mode = 0644,
7f99f06f 772 .proc_handler = &proc_doulongvec_minmax,
c255d844 773 },
d2b176ed
JS		 774#endif
775#ifdef CONFIG_IA64
776 {
777 .ctl_name = KERN_IA64_UNALIGNED,
778 .procname = "ignore-unaligned-usertrap",
779 .data = &no_unaligned_warning,
780 .maxlen = sizeof (int),
781 .mode = 0644,
782 .proc_handler = &proc_dointvec,
783 },
bebfa101 784#endif
c4f3b63f 785#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 786 {
787 .ctl_name = CTL_UNNUMBERED,
788 .procname = "softlockup_panic",
789 .data = &softlockup_panic,
790 .maxlen = sizeof(int),
791 .mode = 0644,
4dca10a9 792 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 793 .strategy = &sysctl_intvec,
794 .extra1 = &zero,
795 .extra2 = &one,
796 },
c4f3b63f
RT		 797 {
798 .ctl_name = CTL_UNNUMBERED,
799 .procname = "softlockup_thresh",
800 .data = &softlockup_thresh,
9383d967 801 .maxlen = sizeof(int),
c4f3b63f 802 .mode = 0644,
9383d967 803 .proc_handler = &proc_dointvec_minmax,
c4f3b63f 804 .strategy = &sysctl_intvec,
9383d967 805 .extra1 = &neg_one,
c4f3b63f
RT		 806 .extra2 = &sixty,
807 },
82a1fcb9
IM		 808 {
809 .ctl_name = CTL_UNNUMBERED,
810 .procname = "hung_task_check_count",
811 .data = &sysctl_hung_task_check_count,
90739081 812 .maxlen = sizeof(unsigned long),
82a1fcb9 813 .mode = 0644,
90739081 814 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 815 .strategy = &sysctl_intvec,
816 },
817 {
818 .ctl_name = CTL_UNNUMBERED,
819 .procname = "hung_task_timeout_secs",
820 .data = &sysctl_hung_task_timeout_secs,
90739081 821 .maxlen = sizeof(unsigned long),
82a1fcb9 822 .mode = 0644,
90739081 823 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 824 .strategy = &sysctl_intvec,
825 },
826 {
827 .ctl_name = CTL_UNNUMBERED,
828 .procname = "hung_task_warnings",
829 .data = &sysctl_hung_task_warnings,
90739081 830 .maxlen = sizeof(unsigned long),
82a1fcb9 831 .mode = 0644,
90739081 832 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 833 .strategy = &sysctl_intvec,
834 },
c4f3b63f 835#endif
bebfa101
AK		 836#ifdef CONFIG_COMPAT
837 {
838 .ctl_name = KERN_COMPAT_LOG,
839 .procname = "compat-log",
840 .data = &compat_log,
841 .maxlen = sizeof (int),
842 .mode = 0644,
843 .proc_handler = &proc_dointvec,
844 },
951f22d5 845#endif
23f78d4a
IM		 846#ifdef CONFIG_RT_MUTEXES
847 {
848 .ctl_name = KERN_MAX_LOCK_DEPTH,
849 .procname = "max_lock_depth",
850 .data = &max_lock_depth,
851 .maxlen = sizeof(int),
852 .mode = 0644,
853 .proc_handler = &proc_dointvec,
854 },
5096add8 855#endif
10a0a8d4
JF		 856 {
857 .ctl_name = CTL_UNNUMBERED,
858 .procname = "poweroff_cmd",
859 .data = &poweroff_cmd,
860 .maxlen = POWEROFF_CMD_PATH_LEN,
861 .mode = 0644,
862 .proc_handler = &proc_dostring,
863 .strategy = &sysctl_string,
864 },
0b77f5bf
DH		 865#ifdef CONFIG_KEYS
866 {
867 .ctl_name = CTL_UNNUMBERED,
868 .procname = "keys",
869 .mode = 0555,
870 .child = key_sysctls,
871 },
872#endif
31a72bce
PM		 873#ifdef CONFIG_RCU_TORTURE_TEST
874 {
875 .ctl_name = CTL_UNNUMBERED,
876 .procname = "rcutorture_runnable",
877 .data = &rcutorture_runnable,
878 .maxlen = sizeof(int),
879 .mode = 0644,
880 .proc_handler = &proc_dointvec,
881 },
882#endif
af936a16
LS		 883#ifdef CONFIG_UNEVICTABLE_LRU
884 {
885 .ctl_name = CTL_UNNUMBERED,
886 .procname = "scan_unevictable_pages",
887 .data = &scan_unevictable_pages,
888 .maxlen = sizeof(scan_unevictable_pages),
889 .mode = 0644,
890 .proc_handler = &scan_unevictable_handler,
891 },
892#endif
ed2c12f3
AM		 893/*
894 * NOTE: do not add new entries to this table unless you have read
895 * Documentation/sysctl/ctl_unnumbered.txt
896 */
1da177e4
LT		 897 { .ctl_name = 0 }
898};
899
d8217f07 900static struct ctl_table vm_table[] = {
1da177e4
LT		 901 {
902 .ctl_name = VM_OVERCOMMIT_MEMORY,
903 .procname = "overcommit_memory",
904 .data = &sysctl_overcommit_memory,
905 .maxlen = sizeof(sysctl_overcommit_memory),
906 .mode = 0644,
907 .proc_handler = &proc_dointvec,
908 },
fadd8fbd
KH		 909 {
910 .ctl_name = VM_PANIC_ON_OOM,
911 .procname = "panic_on_oom",
912 .data = &sysctl_panic_on_oom,
913 .maxlen = sizeof(sysctl_panic_on_oom),
914 .mode = 0644,
915 .proc_handler = &proc_dointvec,
916 },
fe071d7e
DR		 917 {
918 .ctl_name = CTL_UNNUMBERED,
919 .procname = "oom_kill_allocating_task",
920 .data = &sysctl_oom_kill_allocating_task,
921 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
922 .mode = 0644,
923 .proc_handler = &proc_dointvec,
924 },
fef1bdd6
DR		 925 {
926 .ctl_name = CTL_UNNUMBERED,
927 .procname = "oom_dump_tasks",
928 .data = &sysctl_oom_dump_tasks,
929 .maxlen = sizeof(sysctl_oom_dump_tasks),
930 .mode = 0644,
931 .proc_handler = &proc_dointvec,
932 },
1da177e4
LT		 933 {
934 .ctl_name = VM_OVERCOMMIT_RATIO,
935 .procname = "overcommit_ratio",
936 .data = &sysctl_overcommit_ratio,
937 .maxlen = sizeof(sysctl_overcommit_ratio),
938 .mode = 0644,
939 .proc_handler = &proc_dointvec,
940 },
941 {
942 .ctl_name = VM_PAGE_CLUSTER,
943 .procname = "page-cluster",
944 .data = &page_cluster,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = &proc_dointvec,
948 },
949 {
950 .ctl_name = VM_DIRTY_BACKGROUND,
951 .procname = "dirty_background_ratio",
952 .data = &dirty_background_ratio,
953 .maxlen = sizeof(dirty_background_ratio),
954 .mode = 0644,
2da02997 955 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 956 .strategy = &sysctl_intvec,
957 .extra1 = &zero,
958 .extra2 = &one_hundred,
959 },
2da02997
DR		 960 {
961 .ctl_name = CTL_UNNUMBERED,
962 .procname = "dirty_background_bytes",
963 .data = &dirty_background_bytes,
964 .maxlen = sizeof(dirty_background_bytes),
965 .mode = 0644,
966 .proc_handler = &dirty_background_bytes_handler,
967 .strategy = &sysctl_intvec,
968 .extra1 = &one,
969 },
1da177e4
LT		 970 {
971 .ctl_name = VM_DIRTY_RATIO,
972 .procname = "dirty_ratio",
973 .data = &vm_dirty_ratio,
974 .maxlen = sizeof(vm_dirty_ratio),
975 .mode = 0644,
04fbfdc1 976 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 977 .strategy = &sysctl_intvec,
978 .extra1 = &zero,
979 .extra2 = &one_hundred,
980 },
2da02997
DR		 981 {
982 .ctl_name = CTL_UNNUMBERED,
983 .procname = "dirty_bytes",
984 .data = &vm_dirty_bytes,
985 .maxlen = sizeof(vm_dirty_bytes),
986 .mode = 0644,
987 .proc_handler = &dirty_bytes_handler,
988 .strategy = &sysctl_intvec,
989 .extra1 = &one,
990 },
1da177e4 991 {
1da177e4 992 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 993 .data = &dirty_writeback_interval,
994 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 995 .mode = 0644,
996 .proc_handler = &dirty_writeback_centisecs_handler,
997 },
998 {
1da177e4 999 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1000 .data = &dirty_expire_interval,
1001 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1002 .mode = 0644,
f6ef9438 1003 .proc_handler = &proc_dointvec_userhz_jiffies,
1da177e4
LT		 1004 },
1005 {
1006 .ctl_name = VM_NR_PDFLUSH_THREADS,
1007 .procname = "nr_pdflush_threads",
1008 .data = &nr_pdflush_threads,
1009 .maxlen = sizeof nr_pdflush_threads,
1010 .mode = 0444 /* read-only*/,
1011 .proc_handler = &proc_dointvec,
1012 },
1013 {
1014 .ctl_name = VM_SWAPPINESS,
1015 .procname = "swappiness",
1016 .data = &vm_swappiness,
1017 .maxlen = sizeof(vm_swappiness),
1018 .mode = 0644,
1019 .proc_handler = &proc_dointvec_minmax,
1020 .strategy = &sysctl_intvec,
1021 .extra1 = &zero,
1022 .extra2 = &one_hundred,
1023 },
1024#ifdef CONFIG_HUGETLB_PAGE
1025 {
1da177e4 1026 .procname = "nr_hugepages",
e5ff2159 1027 .data = NULL,
1da177e4
LT		 1028 .maxlen = sizeof(unsigned long),
1029 .mode = 0644,
1030 .proc_handler = &hugetlb_sysctl_handler,
1031 .extra1 = (void *)&hugetlb_zero,
1032 .extra2 = (void *)&hugetlb_infinity,
1033 },
1034 {
1035 .ctl_name = VM_HUGETLB_GROUP,
1036 .procname = "hugetlb_shm_group",
1037 .data = &sysctl_hugetlb_shm_group,
1038 .maxlen = sizeof(gid_t),
1039 .mode = 0644,
1040 .proc_handler = &proc_dointvec,
1041 },
396faf03
MG		 1042 {
1043 .ctl_name = CTL_UNNUMBERED,
1044 .procname = "hugepages_treat_as_movable",
1045 .data = &hugepages_treat_as_movable,
1046 .maxlen = sizeof(int),
1047 .mode = 0644,
1048 .proc_handler = &hugetlb_treat_movable_handler,
1049 },
d1c3fb1f
NA		 1050 {
1051 .ctl_name = CTL_UNNUMBERED,
1052 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1053 .data = NULL,
1054 .maxlen = sizeof(unsigned long),
d1c3fb1f 1055 .mode = 0644,
a3d0c6aa 1056 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1057 .extra1 = (void *)&hugetlb_zero,
1058 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1059 },
1da177e4
LT		 1060#endif
1061 {
1062 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1063 .procname = "lowmem_reserve_ratio",
1064 .data = &sysctl_lowmem_reserve_ratio,
1065 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1066 .mode = 0644,
1067 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1068 .strategy = &sysctl_intvec,
1069 },
9d0243bc
AM		 1070 {
1071 .ctl_name = VM_DROP_PAGECACHE,
1072 .procname = "drop_caches",
1073 .data = &sysctl_drop_caches,
1074 .maxlen = sizeof(int),
1075 .mode = 0644,
1076 .proc_handler = drop_caches_sysctl_handler,
1077 .strategy = &sysctl_intvec,
1078 },
1da177e4
LT		 1079 {
1080 .ctl_name = VM_MIN_FREE_KBYTES,
1081 .procname = "min_free_kbytes",
1082 .data = &min_free_kbytes,
1083 .maxlen = sizeof(min_free_kbytes),
1084 .mode = 0644,
1085 .proc_handler = &min_free_kbytes_sysctl_handler,
1086 .strategy = &sysctl_intvec,
1087 .extra1 = &zero,
1088 },
8ad4b1fb
RS		 1089 {
1090 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1091 .procname = "percpu_pagelist_fraction",
1092 .data = &percpu_pagelist_fraction,
1093 .maxlen = sizeof(percpu_pagelist_fraction),
1094 .mode = 0644,
1095 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1096 .strategy = &sysctl_intvec,
1097 .extra1 = &min_percpu_pagelist_fract,
1098 },
1da177e4
LT		 1099#ifdef CONFIG_MMU
1100 {
1101 .ctl_name = VM_MAX_MAP_COUNT,
1102 .procname = "max_map_count",
1103 .data = &sysctl_max_map_count,
1104 .maxlen = sizeof(sysctl_max_map_count),
1105 .mode = 0644,
1106 .proc_handler = &proc_dointvec
1107 },
dd8632a1
PM		 1108#else
1109 {
1110 .ctl_name = CTL_UNNUMBERED,
1111 .procname = "nr_trim_pages",
1112 .data = &sysctl_nr_trim_pages,
1113 .maxlen = sizeof(sysctl_nr_trim_pages),
1114 .mode = 0644,
1115 .proc_handler = &proc_dointvec_minmax,
1116 .strategy = &sysctl_intvec,
1117 .extra1 = &zero,
1118 },
1da177e4
LT		 1119#endif
1120 {
1121 .ctl_name = VM_LAPTOP_MODE,
1122 .procname = "laptop_mode",
1123 .data = &laptop_mode,
1124 .maxlen = sizeof(laptop_mode),
1125 .mode = 0644,
ed5b43f1
BS		 1126 .proc_handler = &proc_dointvec_jiffies,
1127 .strategy = &sysctl_jiffies,
1da177e4
LT		 1128 },
1129 {
1130 .ctl_name = VM_BLOCK_DUMP,
1131 .procname = "block_dump",
1132 .data = &block_dump,
1133 .maxlen = sizeof(block_dump),
1134 .mode = 0644,
1135 .proc_handler = &proc_dointvec,
1136 .strategy = &sysctl_intvec,
1137 .extra1 = &zero,
1138 },
1139 {
1140 .ctl_name = VM_VFS_CACHE_PRESSURE,
1141 .procname = "vfs_cache_pressure",
1142 .data = &sysctl_vfs_cache_pressure,
1143 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1144 .mode = 0644,
1145 .proc_handler = &proc_dointvec,
1146 .strategy = &sysctl_intvec,
1147 .extra1 = &zero,
1148 },
1149#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1150 {
1151 .ctl_name = VM_LEGACY_VA_LAYOUT,
1152 .procname = "legacy_va_layout",
1153 .data = &sysctl_legacy_va_layout,
1154 .maxlen = sizeof(sysctl_legacy_va_layout),
1155 .mode = 0644,
1156 .proc_handler = &proc_dointvec,
1157 .strategy = &sysctl_intvec,
1158 .extra1 = &zero,
1159 },
1160#endif
1743660b
CL		 1161#ifdef CONFIG_NUMA
1162 {
1163 .ctl_name = VM_ZONE_RECLAIM_MODE,
1164 .procname = "zone_reclaim_mode",
1165 .data = &zone_reclaim_mode,
1166 .maxlen = sizeof(zone_reclaim_mode),
1167 .mode = 0644,
1168 .proc_handler = &proc_dointvec,
c84db23c
CL		 1169 .strategy = &sysctl_intvec,
1170 .extra1 = &zero,
1743660b 1171 },
9614634f
CL		 1172 {
1173 .ctl_name = VM_MIN_UNMAPPED,
1174 .procname = "min_unmapped_ratio",
1175 .data = &sysctl_min_unmapped_ratio,
1176 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1177 .mode = 0644,
1178 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1179 .strategy = &sysctl_intvec,
1180 .extra1 = &zero,
1181 .extra2 = &one_hundred,
1182 },
0ff38490
CL		 1183 {
1184 .ctl_name = VM_MIN_SLAB,
1185 .procname = "min_slab_ratio",
1186 .data = &sysctl_min_slab_ratio,
1187 .maxlen = sizeof(sysctl_min_slab_ratio),
1188 .mode = 0644,
1189 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1190 .strategy = &sysctl_intvec,
1191 .extra1 = &zero,
1192 .extra2 = &one_hundred,
1193 },
e6e5494c 1194#endif
77461ab3
CL		 1195#ifdef CONFIG_SMP
1196 {
1197 .ctl_name = CTL_UNNUMBERED,
1198 .procname = "stat_interval",
1199 .data = &sysctl_stat_interval,
1200 .maxlen = sizeof(sysctl_stat_interval),
1201 .mode = 0644,
1202 .proc_handler = &proc_dointvec_jiffies,
1203 .strategy = &sysctl_jiffies,
1204 },
1205#endif
ed032189
EP		 1206#ifdef CONFIG_SECURITY
1207 {
1208 .ctl_name = CTL_UNNUMBERED,
1209 .procname = "mmap_min_addr",
1210 .data = &mmap_min_addr,
1211 .maxlen = sizeof(unsigned long),
1212 .mode = 0644,
1213 .proc_handler = &proc_doulongvec_minmax,
1214 },
8daec965 1215#endif
f0c0b2b8
KH		 1216#ifdef CONFIG_NUMA
1217 {
1218 .ctl_name = CTL_UNNUMBERED,
1219 .procname = "numa_zonelist_order",
1220 .data = &numa_zonelist_order,
1221 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1222 .mode = 0644,
1223 .proc_handler = &numa_zonelist_order_handler,
1224 .strategy = &sysctl_string,
1225 },
1226#endif
2b8232ce 1227#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1228 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1229 {
1230 .ctl_name = VM_VDSO_ENABLED,
1231 .procname = "vdso_enabled",
1232 .data = &vdso_enabled,
1233 .maxlen = sizeof(vdso_enabled),
1234 .mode = 0644,
1235 .proc_handler = &proc_dointvec,
1236 .strategy = &sysctl_intvec,
1237 .extra1 = &zero,
1238 },
1da177e4 1239#endif
195cf453
BG		 1240#ifdef CONFIG_HIGHMEM
1241 {
1242 .ctl_name = CTL_UNNUMBERED,
1243 .procname = "highmem_is_dirtyable",
1244 .data = &vm_highmem_is_dirtyable,
1245 .maxlen = sizeof(vm_highmem_is_dirtyable),
1246 .mode = 0644,
1247 .proc_handler = &proc_dointvec_minmax,
1248 .strategy = &sysctl_intvec,
1249 .extra1 = &zero,
1250 .extra2 = &one,
1251 },
1252#endif
2be7fe07
AM		 1253/*
1254 * NOTE: do not add new entries to this table unless you have read
1255 * Documentation/sysctl/ctl_unnumbered.txt
1256 */
1da177e4
LT		 1257 { .ctl_name = 0 }
1258};
1259
2abc26fc 1260#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1261static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1262 { .ctl_name = 0 }
1263};
1264#endif
1265
d8217f07 1266static struct ctl_table fs_table[] = {
1da177e4
LT		 1267 {
1268 .ctl_name = FS_NRINODE,
1269 .procname = "inode-nr",
1270 .data = &inodes_stat,
1271 .maxlen = 2*sizeof(int),
1272 .mode = 0444,
1273 .proc_handler = &proc_dointvec,
1274 },
1275 {
1276 .ctl_name = FS_STATINODE,
1277 .procname = "inode-state",
1278 .data = &inodes_stat,
1279 .maxlen = 7*sizeof(int),
1280 .mode = 0444,
1281 .proc_handler = &proc_dointvec,
1282 },
1283 {
1da177e4
LT		 1284 .procname = "file-nr",
1285 .data = &files_stat,
1286 .maxlen = 3*sizeof(int),
1287 .mode = 0444,
529bf6be 1288 .proc_handler = &proc_nr_files,
1da177e4
LT		 1289 },
1290 {
1291 .ctl_name = FS_MAXFILE,
1292 .procname = "file-max",
1293 .data = &files_stat.max_files,
1294 .maxlen = sizeof(int),
1295 .mode = 0644,
1296 .proc_handler = &proc_dointvec,
1297 },
9cfe015a
ED		 1298 {
1299 .ctl_name = CTL_UNNUMBERED,
1300 .procname = "nr_open",
1301 .data = &sysctl_nr_open,
1302 .maxlen = sizeof(int),
1303 .mode = 0644,
eceea0b3
AV		 1304 .proc_handler = &proc_dointvec_minmax,
1305 .extra1 = &sysctl_nr_open_min,
1306 .extra2 = &sysctl_nr_open_max,
9cfe015a 1307 },
1da177e4
LT		 1308 {
1309 .ctl_name = FS_DENTRY,
1310 .procname = "dentry-state",
1311 .data = &dentry_stat,
1312 .maxlen = 6*sizeof(int),
1313 .mode = 0444,
1314 .proc_handler = &proc_dointvec,
1315 },
1316 {
1317 .ctl_name = FS_OVERFLOWUID,
1318 .procname = "overflowuid",
1319 .data = &fs_overflowuid,
1320 .maxlen = sizeof(int),
1321 .mode = 0644,
1322 .proc_handler = &proc_dointvec_minmax,
1323 .strategy = &sysctl_intvec,
1324 .extra1 = &minolduid,
1325 .extra2 = &maxolduid,
1326 },
1327 {
1328 .ctl_name = FS_OVERFLOWGID,
1329 .procname = "overflowgid",
1330 .data = &fs_overflowgid,
1331 .maxlen = sizeof(int),
1332 .mode = 0644,
1333 .proc_handler = &proc_dointvec_minmax,
1334 .strategy = &sysctl_intvec,
1335 .extra1 = &minolduid,
1336 .extra2 = &maxolduid,
1337 },
bfcd17a6 1338#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1339 {
1340 .ctl_name = FS_LEASES,
1341 .procname = "leases-enable",
1342 .data = &leases_enable,
1343 .maxlen = sizeof(int),
1344 .mode = 0644,
1345 .proc_handler = &proc_dointvec,
1346 },
bfcd17a6 1347#endif
1da177e4
LT		 1348#ifdef CONFIG_DNOTIFY
1349 {
1350 .ctl_name = FS_DIR_NOTIFY,
1351 .procname = "dir-notify-enable",
1352 .data = &dir_notify_enable,
1353 .maxlen = sizeof(int),
1354 .mode = 0644,
1355 .proc_handler = &proc_dointvec,
1356 },
1357#endif
1358#ifdef CONFIG_MMU
bfcd17a6 1359#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1360 {
1361 .ctl_name = FS_LEASE_TIME,
1362 .procname = "lease-break-time",
1363 .data = &lease_break_time,
1364 .maxlen = sizeof(int),
1365 .mode = 0644,
76fdbb25
KH		 1366 .proc_handler = &proc_dointvec_minmax,
1367 .strategy = &sysctl_intvec,
1368 .extra1 = &zero,
1369 .extra2 = &two,
1da177e4 1370 },
bfcd17a6 1371#endif
ebf3f09c 1372#ifdef CONFIG_AIO
1da177e4 1373 {
1da177e4
LT		 1374 .procname = "aio-nr",
1375 .data = &aio_nr,
1376 .maxlen = sizeof(aio_nr),
1377 .mode = 0444,
d55b5fda 1378 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1379 },
1380 {
1da177e4
LT		 1381 .procname = "aio-max-nr",
1382 .data = &aio_max_nr,
1383 .maxlen = sizeof(aio_max_nr),
1384 .mode = 0644,
d55b5fda 1385 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1386 },
ebf3f09c 1387#endif /* CONFIG_AIO */
2d9048e2 1388#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1389 {
1390 .ctl_name = FS_INOTIFY,
1391 .procname = "inotify",
1392 .mode = 0555,
1393 .child = inotify_table,
1394 },
1395#endif
7ef9964e
DL		 1396#ifdef CONFIG_EPOLL
1397 {
1398 .procname = "epoll",
1399 .mode = 0555,
1400 .child = epoll_table,
1401 },
1402#endif
1da177e4 1403#endif
d6e71144
AC		 1404 {
1405 .ctl_name = KERN_SETUID_DUMPABLE,
1406 .procname = "suid_dumpable",
1407 .data = &suid_dumpable,
1408 .maxlen = sizeof(int),
1409 .mode = 0644,
1410 .proc_handler = &proc_dointvec,
1411 },
2abc26fc
EB		 1412#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1413 {
1414 .ctl_name = CTL_UNNUMBERED,
1415 .procname = "binfmt_misc",
1416 .mode = 0555,
1417 .child = binfmt_misc_table,
1418 },
1419#endif
2be7fe07
AM		 1420/*
1421 * NOTE: do not add new entries to this table unless you have read
1422 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1423 */
1da177e4
LT		 1424 { .ctl_name = 0 }
1425};
1426
d8217f07 1427static struct ctl_table debug_table[] = {
d0c3d534 1428#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1429 {
1430 .ctl_name = CTL_UNNUMBERED,
1431 .procname = "exception-trace",
1432 .data = &show_unhandled_signals,
1433 .maxlen = sizeof(int),
1434 .mode = 0644,
1435 .proc_handler = proc_dointvec
1436 },
1437#endif
1da177e4
LT		 1438 { .ctl_name = 0 }
1439};
1440
d8217f07 1441static struct ctl_table dev_table[] = {
1da177e4 1442 { .ctl_name = 0 }
0eeca283 1443};
1da177e4 1444
330d57fb
AV		 1445static DEFINE_SPINLOCK(sysctl_lock);
1446
1447/* called under sysctl_lock */
1448static int use_table(struct ctl_table_header *p)
1449{
1450 if (unlikely(p->unregistering))
1451 return 0;
1452 p->used++;
1453 return 1;
1454}
1455
1456/* called under sysctl_lock */
1457static void unuse_table(struct ctl_table_header *p)
1458{
1459 if (!--p->used)
1460 if (unlikely(p->unregistering))
1461 complete(p->unregistering);
1462}
1463
1464/* called under sysctl_lock, will reacquire if has to wait */
1465static void start_unregistering(struct ctl_table_header *p)
1466{
1467 /*
1468 * if p->used is 0, nobody will ever touch that entry again;
1469 * we'll eliminate all paths to it before dropping sysctl_lock
1470 */
1471 if (unlikely(p->used)) {
1472 struct completion wait;
1473 init_completion(&wait);
1474 p->unregistering = &wait;
1475 spin_unlock(&sysctl_lock);
1476 wait_for_completion(&wait);
1477 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1478 } else {
1479 /* anything non-NULL; we'll never dereference it */
1480 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1481 }
1482 /*
1483 * do not remove from the list until nobody holds it; walking the
1484 * list in do_sysctl() relies on that.
1485 */
1486 list_del_init(&p->ctl_entry);
1487}
1488
f7e6ced4
AV		 1489void sysctl_head_get(struct ctl_table_header *head)
1490{
1491 spin_lock(&sysctl_lock);
1492 head->count++;
1493 spin_unlock(&sysctl_lock);
1494}
1495
1496void sysctl_head_put(struct ctl_table_header *head)
1497{
1498 spin_lock(&sysctl_lock);
1499 if (!--head->count)
1500 kfree(head);
1501 spin_unlock(&sysctl_lock);
1502}
1503
1504struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1505{
1506 if (!head)
1507 BUG();
1508 spin_lock(&sysctl_lock);
1509 if (!use_table(head))
1510 head = ERR_PTR(-ENOENT);
1511 spin_unlock(&sysctl_lock);
1512 return head;
1513}
1514
805b5d5e
EB		 1515void sysctl_head_finish(struct ctl_table_header *head)
1516{
1517 if (!head)
1518 return;
1519 spin_lock(&sysctl_lock);
1520 unuse_table(head);
1521 spin_unlock(&sysctl_lock);
1522}
1523
73455092
AV		 1524static struct ctl_table_set *
1525lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1526{
1527 struct ctl_table_set *set = &root->default_set;
1528 if (root->lookup)
1529 set = root->lookup(root, namespaces);
1530 return set;
1531}
1532
e51b6ba0
EB		 1533static struct list_head *
1534lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1535{
73455092
AV		 1536 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1537 return &set->list;
e51b6ba0
EB		 1538}
1539
1540struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1541 struct ctl_table_header *prev)
1542{
1543 struct ctl_table_root *root;
1544 struct list_head *header_list;
805b5d5e
EB		 1545 struct ctl_table_header *head;
1546 struct list_head *tmp;
e51b6ba0 1547
805b5d5e
EB		 1548 spin_lock(&sysctl_lock);
1549 if (prev) {
e51b6ba0 1550 head = prev;
805b5d5e
EB		 1551 tmp = &prev->ctl_entry;
1552 unuse_table(prev);
1553 goto next;
1554 }
1555 tmp = &root_table_header.ctl_entry;
1556 for (;;) {
1557 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1558
1559 if (!use_table(head))
1560 goto next;
1561 spin_unlock(&sysctl_lock);
1562 return head;
1563 next:
e51b6ba0 1564 root = head->root;
805b5d5e 1565 tmp = tmp->next;
e51b6ba0
EB		 1566 header_list = lookup_header_list(root, namespaces);
1567 if (tmp != header_list)
1568 continue;
1569
1570 do {
1571 root = list_entry(root->root_list.next,
1572 struct ctl_table_root, root_list);
1573 if (root == &sysctl_table_root)
1574 goto out;
1575 header_list = lookup_header_list(root, namespaces);
1576 } while (list_empty(header_list));
1577 tmp = header_list->next;
805b5d5e 1578 }
e51b6ba0 1579out:
805b5d5e
EB		 1580 spin_unlock(&sysctl_lock);
1581 return NULL;
1582}
1583
e51b6ba0
EB		 1584struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1585{
1586 return __sysctl_head_next(current->nsproxy, prev);
1587}
1588
1589void register_sysctl_root(struct ctl_table_root *root)
1590{
1591 spin_lock(&sysctl_lock);
1592 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1593 spin_unlock(&sysctl_lock);
1594}
1595
b89a8171 1596#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1597/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1598static int do_sysctl_strategy(struct ctl_table_root *root,
1599 struct ctl_table *table,
2c4c7155
PE		 1600 void __user *oldval, size_t __user *oldlenp,
1601 void __user *newval, size_t newlen)
1602{
1603 int op = 0, rc;
1604
1605 if (oldval)
e6305c43 1606 op |= MAY_READ;
2c4c7155 1607 if (newval)
e6305c43 1608 op |= MAY_WRITE;
d7321cd6 1609 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1610 return -EPERM;
1611
1612 if (table->strategy) {
f221e726 1613 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1614 if (rc < 0)
1615 return rc;
1616 if (rc > 0)
1617 return 0;
1618 }
1619
1620 /* If there is no strategy routine, or if the strategy returns
1621 * zero, proceed with automatic r/w */
1622 if (table->data && table->maxlen) {
f221e726 1623 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1624 if (rc < 0)
1625 return rc;
1626 }
1627 return 0;
1628}
1629
1630static int parse_table(int __user *name, int nlen,
1631 void __user *oldval, size_t __user *oldlenp,
1632 void __user *newval, size_t newlen,
d7321cd6 1633 struct ctl_table_root *root,
2c4c7155
PE		 1634 struct ctl_table *table)
1635{
1636 int n;
1637repeat:
1638 if (!nlen)
1639 return -ENOTDIR;
1640 if (get_user(n, name))
1641 return -EFAULT;
1642 for ( ; table->ctl_name || table->procname; table++) {
1643 if (!table->ctl_name)
1644 continue;
1645 if (n == table->ctl_name) {
1646 int error;
1647 if (table->child) {
e6305c43 1648 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1649 return -EPERM;
1650 name++;
1651 nlen--;
1652 table = table->child;
1653 goto repeat;
1654 }
f221e726 1655 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1656 oldval, oldlenp,
1657 newval, newlen);
1658 return error;
1659 }
1660 }
1661 return -ENOTDIR;
1662}
1663
1da177e4
LT		 1664int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1665 void __user *newval, size_t newlen)
1666{
805b5d5e 1667 struct ctl_table_header *head;
330d57fb 1668 int error = -ENOTDIR;
1da177e4
LT		 1669
1670 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1671 return -ENOTDIR;
1672 if (oldval) {
1673 int old_len;
1674 if (!oldlenp || get_user(old_len, oldlenp))
1675 return -EFAULT;
1676 }
330d57fb 1677
805b5d5e
EB		 1678 for (head = sysctl_head_next(NULL); head;
1679 head = sysctl_head_next(head)) {
330d57fb 1680 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1681 newval, newlen,
1682 head->root, head->ctl_table);
805b5d5e
EB		 1683 if (error != -ENOTDIR) {
1684 sysctl_head_finish(head);
330d57fb 1685 break;
805b5d5e
EB		 1686 }
1687 }
330d57fb 1688 return error;
1da177e4
LT		 1689}
1690
1e7bfb21 1691SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1692{
1693 struct __sysctl_args tmp;
1694 int error;
1695
1696 if (copy_from_user(&tmp, args, sizeof(tmp)))
1697 return -EFAULT;
1698
7058cb02
EB		 1699 error = deprecated_sysctl_warning(&tmp);
1700 if (error)
1701 goto out;
1702
1da177e4
LT		 1703 lock_kernel();
1704 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1705 tmp.newval, tmp.newlen);
1706 unlock_kernel();
7058cb02 1707out:
1da177e4
LT		 1708 return error;
1709}
b89a8171 1710#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1711
1712/*
1ff007eb 1713 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1714 * some sysctl variables are readonly even to root.
1715 */
1716
1717static int test_perm(int mode, int op)
1718{
76aac0e9 1719 if (!current_euid())
1da177e4
LT		 1720 mode >>= 6;
1721 else if (in_egroup_p(0))
1722 mode >>= 3;
e6305c43 1723 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1724 return 0;
1725 return -EACCES;
1726}
1727
d7321cd6 1728int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1729{
1730 int error;
d7321cd6
PE		 1731 int mode;
1732
e6305c43 1733 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1734 if (error)
1735 return error;
d7321cd6
PE		 1736
1737 if (root->permissions)
1738 mode = root->permissions(root, current->nsproxy, table);
1739 else
1740 mode = table->mode;
1741
1742 return test_perm(mode, op);
1da177e4
LT		 1743}
1744
d912b0cc
EB		 1745static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1746{
1747 for (; table->ctl_name || table->procname; table++) {
1748 table->parent = parent;
1749 if (table->child)
1750 sysctl_set_parent(table, table->child);
1751 }
1752}
1753
1754static __init int sysctl_init(void)
1755{
1756 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1757#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1758 {
1759 int err;
1760 err = sysctl_check_table(current->nsproxy, root_table);
1761 }
1762#endif
d912b0cc
EB		 1763 return 0;
1764}
1765
1766core_initcall(sysctl_init);
1767
bfbcf034
AV		 1768static struct ctl_table *is_branch_in(struct ctl_table *branch,
1769 struct ctl_table *table)
ae7edecc
AV		 1770{
1771 struct ctl_table *p;
1772 const char *s = branch->procname;
1773
1774 /* branch should have named subdirectory as its first element */
1775 if (!s || !branch->child)
bfbcf034 1776 return NULL;
ae7edecc
AV		 1777
1778 /* ... and nothing else */
1779 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1780 return NULL;
ae7edecc
AV		 1781
1782 /* table should contain subdirectory with the same name */
1783 for (p = table; p->procname || p->ctl_name; p++) {
1784 if (!p->child)
1785 continue;
1786 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1787 return p;
ae7edecc 1788 }
bfbcf034 1789 return NULL;
ae7edecc
AV		 1790}
1791
1792/* see if attaching q to p would be an improvement */
1793static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1794{
1795 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1796 struct ctl_table *next;
ae7edecc
AV		 1797 int is_better = 0;
1798 int not_in_parent = !p->attached_by;
1799
bfbcf034 1800 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1801 if (by == q->attached_by)
1802 is_better = 1;
1803 if (to == p->attached_by)
1804 not_in_parent = 1;
1805 by = by->child;
bfbcf034 1806 to = next->child;
ae7edecc
AV		 1807 }
1808
1809 if (is_better && not_in_parent) {
1810 q->attached_by = by;
1811 q->attached_to = to;
1812 q->parent = p;
1813 }
1814}
1815
1da177e4 1816/**
e51b6ba0
EB		 1817 * __register_sysctl_paths - register a sysctl hierarchy
1818 * @root: List of sysctl headers to register on
1819 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1820 * @path: The path to the directory the sysctl table is in.
1da177e4 1821 * @table: the top-level table structure
1da177e4
LT		 1822 *
1823 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1824 * array. A completely 0 filled entry terminates the table.
1da177e4 1825 *
d8217f07 1826 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1827 *
1828 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1829 * must be unique within that level of sysctl
1830 *
1831 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1832 * enter a sysctl file
1833 *
1834 * data - a pointer to data for use by proc_handler
1835 *
1836 * maxlen - the maximum size in bytes of the data
1837 *
1838 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1839 *
1840 * child - a pointer to the child sysctl table if this entry is a directory, or
1841 * %NULL.
1842 *
1843 * proc_handler - the text handler routine (described below)
1844 *
1845 * strategy - the strategy routine (described below)
1846 *
1847 * de - for internal use by the sysctl routines
1848 *
1849 * extra1, extra2 - extra pointers usable by the proc handler routines
1850 *
1851 * Leaf nodes in the sysctl tree will be represented by a single file
1852 * under /proc; non-leaf nodes will be represented by directories.
1853 *
1854 * sysctl(2) can automatically manage read and write requests through
1855 * the sysctl table. The data and maxlen fields of the ctl_table
1856 * struct enable minimal validation of the values being written to be
1857 * performed, and the mode field allows minimal authentication.
1858 *
1859 * More sophisticated management can be enabled by the provision of a
1860 * strategy routine with the table entry. This will be called before
1861 * any automatic read or write of the data is performed.
1862 *
1863 * The strategy routine may return
1864 *
1865 * < 0 - Error occurred (error is passed to user process)
1866 *
1867 * 0 - OK - proceed with automatic read or write.
1868 *
1869 * > 0 - OK - read or write has been done by the strategy routine, so
1870 * return immediately.
1871 *
1872 * There must be a proc_handler routine for any terminal nodes
1873 * mirrored under /proc/sys (non-terminals are handled by a built-in
1874 * directory handler). Several default handlers are available to
1875 * cover common cases -
1876 *
1877 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1878 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1879 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1880 *
1881 * It is the handler's job to read the input buffer from user memory
1882 * and process it. The handler should return 0 on success.
1883 *
1884 * This routine returns %NULL on a failure to register, and a pointer
1885 * to the table header on success.
1886 */
e51b6ba0
EB		 1887struct ctl_table_header *__register_sysctl_paths(
1888 struct ctl_table_root *root,
1889 struct nsproxy *namespaces,
1890 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1891{
29e796fd
EB		 1892 struct ctl_table_header *header;
1893 struct ctl_table *new, **prevp;
1894 unsigned int n, npath;
ae7edecc 1895 struct ctl_table_set *set;
29e796fd
EB		 1896
1897 /* Count the path components */
1898 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1899 ;
1900
1901 /*
1902 * For each path component, allocate a 2-element ctl_table array.
1903 * The first array element will be filled with the sysctl entry
1904 * for this, the second will be the sentinel (ctl_name == 0).
1905 *
1906 * We allocate everything in one go so that we don't have to
1907 * worry about freeing additional memory in unregister_sysctl_table.
1908 */
1909 header = kzalloc(sizeof(struct ctl_table_header) +
1910 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1911 if (!header)
1da177e4 1912 return NULL;
29e796fd
EB		 1913
1914 new = (struct ctl_table *) (header + 1);
1915
1916 /* Now connect the dots */
1917 prevp = &header->ctl_table;
1918 for (n = 0; n < npath; ++n, ++path) {
1919 /* Copy the procname */
1920 new->procname = path->procname;
1921 new->ctl_name = path->ctl_name;
1922 new->mode = 0555;
1923
1924 *prevp = new;
1925 prevp = &new->child;
1926
1927 new += 2;
1928 }
1929 *prevp = table;
23eb06de 1930 header->ctl_table_arg = table;
29e796fd
EB		 1931
1932 INIT_LIST_HEAD(&header->ctl_entry);
1933 header->used = 0;
1934 header->unregistering = NULL;
e51b6ba0 1935 header->root = root;
29e796fd 1936 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1937 header->count = 1;
88f458e4 1938#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1939 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1940 kfree(header);
fc6cd25b
EB		 1941 return NULL;
1942 }
88f458e4 1943#endif
330d57fb 1944 spin_lock(&sysctl_lock);
73455092 1945 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 1946 header->attached_by = header->ctl_table;
1947 header->attached_to = root_table;
1948 header->parent = &root_table_header;
1949 for (set = header->set; set; set = set->parent) {
1950 struct ctl_table_header *p;
1951 list_for_each_entry(p, &set->list, ctl_entry) {
1952 if (p->unregistering)
1953 continue;
1954 try_attach(p, header);
1955 }
1956 }
1957 header->parent->count++;
73455092 1958 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 1959 spin_unlock(&sysctl_lock);
29e796fd
EB		 1960
1961 return header;
1962}
1963
e51b6ba0
EB		 1964/**
1965 * register_sysctl_table_path - register a sysctl table hierarchy
1966 * @path: The path to the directory the sysctl table is in.
1967 * @table: the top-level table structure
1968 *
1969 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1970 * array. A completely 0 filled entry terminates the table.
1971 *
1972 * See __register_sysctl_paths for more details.
1973 */
1974struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1975 struct ctl_table *table)
1976{
1977 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1978 path, table);
1979}
1980
29e796fd
EB		 1981/**
1982 * register_sysctl_table - register a sysctl table hierarchy
1983 * @table: the top-level table structure
1984 *
1985 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1986 * array. A completely 0 filled entry terminates the table.
1987 *
1988 * See register_sysctl_paths for more details.
1989 */
1990struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1991{
1992 static const struct ctl_path null_path[] = { {} };
1993
1994 return register_sysctl_paths(null_path, table);
1da177e4
LT		 1995}
1996
1997/**
1998 * unregister_sysctl_table - unregister a sysctl table hierarchy
1999 * @header: the header returned from register_sysctl_table
2000 *
2001 * Unregisters the sysctl table and all children. proc entries may not
2002 * actually be removed until they are no longer used by anyone.
2003 */
2004void unregister_sysctl_table(struct ctl_table_header * header)
2005{
330d57fb 2006 might_sleep();
f1dad166
PE		 2007
2008 if (header == NULL)
2009 return;
2010
330d57fb
AV		 2011 spin_lock(&sysctl_lock);
2012 start_unregistering(header);
ae7edecc
AV		 2013 if (!--header->parent->count) {
2014 WARN_ON(1);
2015 kfree(header->parent);
2016 }
f7e6ced4
AV		 2017 if (!--header->count)
2018 kfree(header);
330d57fb 2019 spin_unlock(&sysctl_lock);
1da177e4
LT		 2020}
2021
9043476f
AV		 2022int sysctl_is_seen(struct ctl_table_header *p)
2023{
2024 struct ctl_table_set *set = p->set;
2025 int res;
2026 spin_lock(&sysctl_lock);
2027 if (p->unregistering)
2028 res = 0;
2029 else if (!set->is_seen)
2030 res = 1;
2031 else
2032 res = set->is_seen(set);
2033 spin_unlock(&sysctl_lock);
2034 return res;
2035}
2036
73455092
AV		 2037void setup_sysctl_set(struct ctl_table_set *p,
2038 struct ctl_table_set *parent,
2039 int (*is_seen)(struct ctl_table_set *))
2040{
2041 INIT_LIST_HEAD(&p->list);
2042 p->parent = parent ? parent : &sysctl_table_root.default_set;
2043 p->is_seen = is_seen;
2044}
2045
b89a8171 2046#else /* !CONFIG_SYSCTL */
d8217f07 2047struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2048{
2049 return NULL;
2050}
2051
29e796fd
EB		 2052struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2053 struct ctl_table *table)
2054{
2055 return NULL;
2056}
2057
b89a8171
EB		 2058void unregister_sysctl_table(struct ctl_table_header * table)
2059{
2060}
2061
73455092
AV		 2062void setup_sysctl_set(struct ctl_table_set *p,
2063 struct ctl_table_set *parent,
2064 int (*is_seen)(struct ctl_table_set *))
2065{
2066}
2067
f7e6ced4
AV		 2068void sysctl_head_put(struct ctl_table_header *head)
2069{
2070}
2071
b89a8171
EB		 2072#endif /* CONFIG_SYSCTL */
2073
1da177e4
LT		 2074/*
2075 * /proc/sys support
2076 */
2077
b89a8171 2078#ifdef CONFIG_PROC_SYSCTL
1da177e4 2079
b1ba4ddd
AB		 2080static int _proc_do_string(void* data, int maxlen, int write,
2081 struct file *filp, void __user *buffer,
2082 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2083{
2084 size_t len;
2085 char __user *p;
2086 char c;
8d060877
ON		 2087
2088 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2089 *lenp = 0;
2090 return 0;
2091 }
8d060877 2092
1da177e4
LT		 2093 if (write) {
2094 len = 0;
2095 p = buffer;
2096 while (len < *lenp) {
2097 if (get_user(c, p++))
2098 return -EFAULT;
2099 if (c == 0 || c == '\n')
2100 break;
2101 len++;
2102 }
f5dd3d6f
SV		 2103 if (len >= maxlen)
2104 len = maxlen-1;
2105 if(copy_from_user(data, buffer, len))
1da177e4 2106 return -EFAULT;
f5dd3d6f 2107 ((char *) data)[len] = 0;
1da177e4
LT		 2108 *ppos += *lenp;
2109 } else {
f5dd3d6f
SV		 2110 len = strlen(data);
2111 if (len > maxlen)
2112 len = maxlen;
8d060877
ON		 2113
2114 if (*ppos > len) {
2115 *lenp = 0;
2116 return 0;
2117 }
2118
2119 data += *ppos;
2120 len -= *ppos;
2121
1da177e4
LT		 2122 if (len > *lenp)
2123 len = *lenp;
2124 if (len)
f5dd3d6f 2125 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2126 return -EFAULT;
2127 if (len < *lenp) {
2128 if(put_user('\n', ((char __user *) buffer) + len))
2129 return -EFAULT;
2130 len++;
2131 }
2132 *lenp = len;
2133 *ppos += len;
2134 }
2135 return 0;
2136}
2137
f5dd3d6f
SV		 2138/**
2139 * proc_dostring - read a string sysctl
2140 * @table: the sysctl table
2141 * @write: %TRUE if this is a write to the sysctl file
2142 * @filp: the file structure
2143 * @buffer: the user buffer
2144 * @lenp: the size of the user buffer
2145 * @ppos: file position
2146 *
2147 * Reads/writes a string from/to the user buffer. If the kernel
2148 * buffer provided is not large enough to hold the string, the
2149 * string is truncated. The copied string is %NULL-terminated.
2150 * If the string is being read by the user process, it is copied
2151 * and a newline '\n' is added. It is truncated if the buffer is
2152 * not large enough.
2153 *
2154 * Returns 0 on success.
2155 */
d8217f07 2156int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2157 void __user *buffer, size_t *lenp, loff_t *ppos)
2158{
2159 return _proc_do_string(table->data, table->maxlen, write, filp,
2160 buffer, lenp, ppos);
2161}
2162
1da177e4
LT		 2163
2164static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2165 int *valp,
2166 int write, void *data)
2167{
2168 if (write) {
2169 *valp = *negp ? -*lvalp : *lvalp;
2170 } else {
2171 int val = *valp;
2172 if (val < 0) {
2173 *negp = -1;
2174 *lvalp = (unsigned long)-val;
2175 } else {
2176 *negp = 0;
2177 *lvalp = (unsigned long)val;
2178 }
2179 }
2180 return 0;
2181}
2182
d8217f07 2183static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2184 int write, struct file *filp, void __user *buffer,
2185 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2186 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2187 int write, void *data),
2188 void *data)
2189{
2190#define TMPBUFLEN 21
2191 int *i, vleft, first=1, neg, val;
2192 unsigned long lval;
2193 size_t left, len;
2194
2195 char buf[TMPBUFLEN], *p;
2196 char __user *s = buffer;
2197
fcfbd547 2198 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2199 (*ppos && !write)) {
2200 *lenp = 0;
2201 return 0;
2202 }
2203
fcfbd547 2204 i = (int *) tbl_data;
1da177e4
LT		 2205 vleft = table->maxlen / sizeof(*i);
2206 left = *lenp;
2207
2208 if (!conv)
2209 conv = do_proc_dointvec_conv;
2210
2211 for (; left && vleft--; i++, first=0) {
2212 if (write) {
2213 while (left) {
2214 char c;
2215 if (get_user(c, s))
2216 return -EFAULT;
2217 if (!isspace(c))
2218 break;
2219 left--;
2220 s++;
2221 }
2222 if (!left)
2223 break;
2224 neg = 0;
2225 len = left;
2226 if (len > sizeof(buf) - 1)
2227 len = sizeof(buf) - 1;
2228 if (copy_from_user(buf, s, len))
2229 return -EFAULT;
2230 buf[len] = 0;
2231 p = buf;
2232 if (*p == '-' && left > 1) {
2233 neg = 1;
bd9b0bac 2234 p++;
1da177e4
LT		 2235 }
2236 if (*p < '0' || *p > '9')
2237 break;
2238
2239 lval = simple_strtoul(p, &p, 0);
2240
2241 len = p-buf;
2242 if ((len < left) && *p && !isspace(*p))
2243 break;
2244 if (neg)
2245 val = -val;
2246 s += len;
2247 left -= len;
2248
2249 if (conv(&neg, &lval, i, 1, data))
2250 break;
2251 } else {
2252 p = buf;
2253 if (!first)
2254 *p++ = '\t';
2255
2256 if (conv(&neg, &lval, i, 0, data))
2257 break;
2258
2259 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2260 len = strlen(buf);
2261 if (len > left)
2262 len = left;
2263 if(copy_to_user(s, buf, len))
2264 return -EFAULT;
2265 left -= len;
2266 s += len;
2267 }
2268 }
2269
2270 if (!write && !first && left) {
2271 if(put_user('\n', s))
2272 return -EFAULT;
2273 left--, s++;
2274 }
2275 if (write) {
2276 while (left) {
2277 char c;
2278 if (get_user(c, s++))
2279 return -EFAULT;
2280 if (!isspace(c))
2281 break;
2282 left--;
2283 }
2284 }
2285 if (write && first)
2286 return -EINVAL;
2287 *lenp -= left;
2288 *ppos += *lenp;
2289 return 0;
2290#undef TMPBUFLEN
2291}
2292
d8217f07 2293static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2294 void __user *buffer, size_t *lenp, loff_t *ppos,
2295 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2296 int write, void *data),
2297 void *data)
2298{
2299 return __do_proc_dointvec(table->data, table, write, filp,
2300 buffer, lenp, ppos, conv, data);
2301}
2302
1da177e4
LT		 2303/**
2304 * proc_dointvec - read a vector of integers
2305 * @table: the sysctl table
2306 * @write: %TRUE if this is a write to the sysctl file
2307 * @filp: the file structure
2308 * @buffer: the user buffer
2309 * @lenp: the size of the user buffer
2310 * @ppos: file position
2311 *
2312 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2313 * values from/to the user buffer, treated as an ASCII string.
2314 *
2315 * Returns 0 on success.
2316 */
d8217f07 2317int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2318 void __user *buffer, size_t *lenp, loff_t *ppos)
2319{
2320 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2321 NULL,NULL);
2322}
2323
34f5a398 2324/*
25ddbb18
AK		 2325 * Taint values can only be increased
2326 * This means we can safely use a temporary.
34f5a398 2327 */
25ddbb18 2328static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2329 void __user *buffer, size_t *lenp, loff_t *ppos)
2330{
25ddbb18
AK		 2331 struct ctl_table t;
2332 unsigned long tmptaint = get_taint();
2333 int err;
34f5a398 2334
91fcd412 2335 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2336 return -EPERM;
2337
25ddbb18
AK		 2338 t = *table;
2339 t.data = &tmptaint;
2340 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2341 if (err < 0)
2342 return err;
2343
2344 if (write) {
2345 /*
2346 * Poor man's atomic or. Not worth adding a primitive
2347 * to everyone's atomic.h for this
2348 */
2349 int i;
2350 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2351 if ((tmptaint >> i) & 1)
2352 add_taint(i);
2353 }
2354 }
2355
2356 return err;
34f5a398
TT		 2357}
2358
1da177e4
LT		 2359struct do_proc_dointvec_minmax_conv_param {
2360 int *min;
2361 int *max;
2362};
2363
2364static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2365 int *valp,
2366 int write, void *data)
2367{
2368 struct do_proc_dointvec_minmax_conv_param *param = data;
2369 if (write) {
2370 int val = *negp ? -*lvalp : *lvalp;
2371 if ((param->min && *param->min > val) ||
2372 (param->max && *param->max < val))
2373 return -EINVAL;
2374 *valp = val;
2375 } else {
2376 int val = *valp;
2377 if (val < 0) {
2378 *negp = -1;
2379 *lvalp = (unsigned long)-val;
2380 } else {
2381 *negp = 0;
2382 *lvalp = (unsigned long)val;
2383 }
2384 }
2385 return 0;
2386}
2387
2388/**
2389 * proc_dointvec_minmax - read a vector of integers with min/max values
2390 * @table: the sysctl table
2391 * @write: %TRUE if this is a write to the sysctl file
2392 * @filp: the file structure
2393 * @buffer: the user buffer
2394 * @lenp: the size of the user buffer
2395 * @ppos: file position
2396 *
2397 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2398 * values from/to the user buffer, treated as an ASCII string.
2399 *
2400 * This routine will ensure the values are within the range specified by
2401 * table->extra1 (min) and table->extra2 (max).
2402 *
2403 * Returns 0 on success.
2404 */
d8217f07 2405int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2406 void __user *buffer, size_t *lenp, loff_t *ppos)
2407{
2408 struct do_proc_dointvec_minmax_conv_param param = {
2409 .min = (int *) table->extra1,
2410 .max = (int *) table->extra2,
2411 };
2412 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2413 do_proc_dointvec_minmax_conv, &param);
2414}
2415
d8217f07 2416static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2417 struct file *filp,
2418 void __user *buffer,
2419 size_t *lenp, loff_t *ppos,
2420 unsigned long convmul,
2421 unsigned long convdiv)
2422{
2423#define TMPBUFLEN 21
2424 unsigned long *i, *min, *max, val;
2425 int vleft, first=1, neg;
2426 size_t len, left;
2427 char buf[TMPBUFLEN], *p;
2428 char __user *s = buffer;
2429
fcfbd547 2430 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2431 (*ppos && !write)) {
2432 *lenp = 0;
2433 return 0;
2434 }
2435
fcfbd547 2436 i = (unsigned long *) data;
1da177e4
LT		 2437 min = (unsigned long *) table->extra1;
2438 max = (unsigned long *) table->extra2;
2439 vleft = table->maxlen / sizeof(unsigned long);
2440 left = *lenp;
2441
2442 for (; left && vleft--; i++, min++, max++, first=0) {
2443 if (write) {
2444 while (left) {
2445 char c;
2446 if (get_user(c, s))
2447 return -EFAULT;
2448 if (!isspace(c))
2449 break;
2450 left--;
2451 s++;
2452 }
2453 if (!left)
2454 break;
2455 neg = 0;
2456 len = left;
2457 if (len > TMPBUFLEN-1)
2458 len = TMPBUFLEN-1;
2459 if (copy_from_user(buf, s, len))
2460 return -EFAULT;
2461 buf[len] = 0;
2462 p = buf;
2463 if (*p == '-' && left > 1) {
2464 neg = 1;
bd9b0bac 2465 p++;
1da177e4
LT		 2466 }
2467 if (*p < '0' || *p > '9')
2468 break;
2469 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2470 len = p-buf;
2471 if ((len < left) && *p && !isspace(*p))
2472 break;
2473 if (neg)
2474 val = -val;
2475 s += len;
2476 left -= len;
2477
2478 if(neg)
2479 continue;
2480 if ((min && val < *min) || (max && val > *max))
2481 continue;
2482 *i = val;
2483 } else {
2484 p = buf;
2485 if (!first)
2486 *p++ = '\t';
2487 sprintf(p, "%lu", convdiv * (*i) / convmul);
2488 len = strlen(buf);
2489 if (len > left)
2490 len = left;
2491 if(copy_to_user(s, buf, len))
2492 return -EFAULT;
2493 left -= len;
2494 s += len;
2495 }
2496 }
2497
2498 if (!write && !first && left) {
2499 if(put_user('\n', s))
2500 return -EFAULT;
2501 left--, s++;
2502 }
2503 if (write) {
2504 while (left) {
2505 char c;
2506 if (get_user(c, s++))
2507 return -EFAULT;
2508 if (!isspace(c))
2509 break;
2510 left--;
2511 }
2512 }
2513 if (write && first)
2514 return -EINVAL;
2515 *lenp -= left;
2516 *ppos += *lenp;
2517 return 0;
2518#undef TMPBUFLEN
2519}
2520
d8217f07 2521static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2522 struct file *filp,
2523 void __user *buffer,
2524 size_t *lenp, loff_t *ppos,
2525 unsigned long convmul,
2526 unsigned long convdiv)
2527{
2528 return __do_proc_doulongvec_minmax(table->data, table, write,
2529 filp, buffer, lenp, ppos, convmul, convdiv);
2530}
2531
1da177e4
LT		 2532/**
2533 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2534 * @table: the sysctl table
2535 * @write: %TRUE if this is a write to the sysctl file
2536 * @filp: the file structure
2537 * @buffer: the user buffer
2538 * @lenp: the size of the user buffer
2539 * @ppos: file position
2540 *
2541 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2542 * values from/to the user buffer, treated as an ASCII string.
2543 *
2544 * This routine will ensure the values are within the range specified by
2545 * table->extra1 (min) and table->extra2 (max).
2546 *
2547 * Returns 0 on success.
2548 */
d8217f07 2549int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2550 void __user *buffer, size_t *lenp, loff_t *ppos)
2551{
2552 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2553}
2554
2555/**
2556 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2557 * @table: the sysctl table
2558 * @write: %TRUE if this is a write to the sysctl file
2559 * @filp: the file structure
2560 * @buffer: the user buffer
2561 * @lenp: the size of the user buffer
2562 * @ppos: file position
2563 *
2564 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2565 * values from/to the user buffer, treated as an ASCII string. The values
2566 * are treated as milliseconds, and converted to jiffies when they are stored.
2567 *
2568 * This routine will ensure the values are within the range specified by
2569 * table->extra1 (min) and table->extra2 (max).
2570 *
2571 * Returns 0 on success.
2572 */
d8217f07 2573int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2574 struct file *filp,
2575 void __user *buffer,
2576 size_t *lenp, loff_t *ppos)
2577{
2578 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2579 lenp, ppos, HZ, 1000l);
2580}
2581
2582
2583static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2584 int *valp,
2585 int write, void *data)
2586{
2587 if (write) {
cba9f33d
BS		 2588 if (*lvalp > LONG_MAX / HZ)
2589 return 1;
1da177e4
LT		 2590 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2591 } else {
2592 int val = *valp;
2593 unsigned long lval;
2594 if (val < 0) {
2595 *negp = -1;
2596 lval = (unsigned long)-val;
2597 } else {
2598 *negp = 0;
2599 lval = (unsigned long)val;
2600 }
2601 *lvalp = lval / HZ;
2602 }
2603 return 0;
2604}
2605
2606static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2607 int *valp,
2608 int write, void *data)
2609{
2610 if (write) {
cba9f33d
BS		 2611 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2612 return 1;
1da177e4
LT		 2613 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2614 } else {
2615 int val = *valp;
2616 unsigned long lval;
2617 if (val < 0) {
2618 *negp = -1;
2619 lval = (unsigned long)-val;
2620 } else {
2621 *negp = 0;
2622 lval = (unsigned long)val;
2623 }
2624 *lvalp = jiffies_to_clock_t(lval);
2625 }
2626 return 0;
2627}
2628
2629static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2630 int *valp,
2631 int write, void *data)
2632{
2633 if (write) {
2634 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2635 } else {
2636 int val = *valp;
2637 unsigned long lval;
2638 if (val < 0) {
2639 *negp = -1;
2640 lval = (unsigned long)-val;
2641 } else {
2642 *negp = 0;
2643 lval = (unsigned long)val;
2644 }
2645 *lvalp = jiffies_to_msecs(lval);
2646 }
2647 return 0;
2648}
2649
2650/**
2651 * proc_dointvec_jiffies - read a vector of integers as seconds
2652 * @table: the sysctl table
2653 * @write: %TRUE if this is a write to the sysctl file
2654 * @filp: the file structure
2655 * @buffer: the user buffer
2656 * @lenp: the size of the user buffer
2657 * @ppos: file position
2658 *
2659 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2660 * values from/to the user buffer, treated as an ASCII string.
2661 * The values read are assumed to be in seconds, and are converted into
2662 * jiffies.
2663 *
2664 * Returns 0 on success.
2665 */
d8217f07 2666int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2667 void __user *buffer, size_t *lenp, loff_t *ppos)
2668{
2669 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2670 do_proc_dointvec_jiffies_conv,NULL);
2671}
2672
2673/**
2674 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2675 * @table: the sysctl table
2676 * @write: %TRUE if this is a write to the sysctl file
2677 * @filp: the file structure
2678 * @buffer: the user buffer
2679 * @lenp: the size of the user buffer
1e5d5331 2680 * @ppos: pointer to the file position
1da177e4
LT		 2681 *
2682 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2683 * values from/to the user buffer, treated as an ASCII string.
2684 * The values read are assumed to be in 1/USER_HZ seconds, and
2685 * are converted into jiffies.
2686 *
2687 * Returns 0 on success.
2688 */
d8217f07 2689int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2690 void __user *buffer, size_t *lenp, loff_t *ppos)
2691{
2692 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2693 do_proc_dointvec_userhz_jiffies_conv,NULL);
2694}
2695
2696/**
2697 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2698 * @table: the sysctl table
2699 * @write: %TRUE if this is a write to the sysctl file
2700 * @filp: the file structure
2701 * @buffer: the user buffer
2702 * @lenp: the size of the user buffer
67be2dd1
MW		 2703 * @ppos: file position
2704 * @ppos: the current position in the file
1da177e4
LT		 2705 *
2706 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2707 * values from/to the user buffer, treated as an ASCII string.
2708 * The values read are assumed to be in 1/1000 seconds, and
2709 * are converted into jiffies.
2710 *
2711 * Returns 0 on success.
2712 */
d8217f07 2713int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2714 void __user *buffer, size_t *lenp, loff_t *ppos)
2715{
2716 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2717 do_proc_dointvec_ms_jiffies_conv, NULL);
2718}
2719
d8217f07 2720static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2721 void __user *buffer, size_t *lenp, loff_t *ppos)
2722{
2723 struct pid *new_pid;
2724 pid_t tmp;
2725 int r;
2726
6c5f3e7b 2727 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2728
2729 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2730 lenp, ppos, NULL, NULL);
2731 if (r || !write)
2732 return r;
2733
2734 new_pid = find_get_pid(tmp);
2735 if (!new_pid)
2736 return -ESRCH;
2737
2738 put_pid(xchg(&cad_pid, new_pid));
2739 return 0;
2740}
2741
1da177e4
LT		 2742#else /* CONFIG_PROC_FS */
2743
d8217f07 2744int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2745 void __user *buffer, size_t *lenp, loff_t *ppos)
2746{
2747 return -ENOSYS;
2748}
2749
d8217f07 2750int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2751 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2752{
2753 return -ENOSYS;
2754}
2755
d8217f07 2756int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2757 void __user *buffer, size_t *lenp, loff_t *ppos)
2758{
2759 return -ENOSYS;
2760}
2761
d8217f07 2762int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2763 void __user *buffer, size_t *lenp, loff_t *ppos)
2764{
2765 return -ENOSYS;
2766}
2767
d8217f07 2768int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2769 void __user *buffer, size_t *lenp, loff_t *ppos)
2770{
2771 return -ENOSYS;
2772}
2773
d8217f07 2774int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2775 void __user *buffer, size_t *lenp, loff_t *ppos)
2776{
2777 return -ENOSYS;
2778}
2779
d8217f07 2780int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2781 void __user *buffer, size_t *lenp, loff_t *ppos)
2782{
2783 return -ENOSYS;
2784}
2785
d8217f07 2786int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2787 struct file *filp,
2788 void __user *buffer,
2789 size_t *lenp, loff_t *ppos)
2790{
2791 return -ENOSYS;
2792}
2793
2794
2795#endif /* CONFIG_PROC_FS */
2796
2797
b89a8171 2798#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2799/*
2800 * General sysctl support routines
2801 */
2802
49a0c458 2803/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2804int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2805 void __user *oldval, size_t __user *oldlenp,
2806 void __user *newval, size_t newlen)
2807{
2808 size_t len;
2809
2810 /* Get out of I don't have a variable */
2811 if (!table->data || !table->maxlen)
2812 return -ENOTDIR;
2813
2814 if (oldval && oldlenp) {
2815 if (get_user(len, oldlenp))
2816 return -EFAULT;
2817 if (len) {
2818 if (len > table->maxlen)
2819 len = table->maxlen;
2820 if (copy_to_user(oldval, table->data, len))
2821 return -EFAULT;
2822 if (put_user(len, oldlenp))
2823 return -EFAULT;
2824 }
2825 }
2826
2827 if (newval && newlen) {
2828 if (newlen > table->maxlen)
2829 newlen = table->maxlen;
2830
2831 if (copy_from_user(table->data, newval, newlen))
2832 return -EFAULT;
2833 }
2834 return 1;
2835}
2836
1da177e4 2837/* The generic string strategy routine: */
f221e726 2838int sysctl_string(struct ctl_table *table,
1da177e4 2839 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2840 void __user *newval, size_t newlen)
1da177e4 2841{
1da177e4
LT		 2842 if (!table->data || !table->maxlen)
2843 return -ENOTDIR;
2844
2845 if (oldval && oldlenp) {
de9e007d
LT		 2846 size_t bufsize;
2847 if (get_user(bufsize, oldlenp))
1da177e4 2848 return -EFAULT;
de9e007d
LT		 2849 if (bufsize) {
2850 size_t len = strlen(table->data), copied;
2851
2852 /* This shouldn't trigger for a well-formed sysctl */
2853 if (len > table->maxlen)
1da177e4 2854 len = table->maxlen;
de9e007d
LT		 2855
2856 /* Copy up to a max of bufsize-1 bytes of the string */
2857 copied = (len >= bufsize) ? bufsize - 1 : len;
2858
2859 if (copy_to_user(oldval, table->data, copied) ||
2860 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2861 return -EFAULT;
de9e007d 2862 if (put_user(len, oldlenp))
1da177e4
LT		 2863 return -EFAULT;
2864 }
2865 }
2866 if (newval && newlen) {
de9e007d 2867 size_t len = newlen;
1da177e4
LT		 2868 if (len > table->maxlen)
2869 len = table->maxlen;
2870 if(copy_from_user(table->data, newval, len))
2871 return -EFAULT;
2872 if (len == table->maxlen)
2873 len--;
2874 ((char *) table->data)[len] = 0;
2875 }
82c9df82 2876 return 1;
1da177e4
LT		 2877}
2878
2879/*
2880 * This function makes sure that all of the integers in the vector
2881 * are between the minimum and maximum values given in the arrays
2882 * table->extra1 and table->extra2, respectively.
2883 */
f221e726 2884int sysctl_intvec(struct ctl_table *table,
1da177e4 2885 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2886 void __user *newval, size_t newlen)
1da177e4
LT		 2887{
2888
2889 if (newval && newlen) {
2890 int __user *vec = (int __user *) newval;
2891 int *min = (int *) table->extra1;
2892 int *max = (int *) table->extra2;
2893 size_t length;
2894 int i;
2895
2896 if (newlen % sizeof(int) != 0)
2897 return -EINVAL;
2898
2899 if (!table->extra1 && !table->extra2)
2900 return 0;
2901
2902 if (newlen > table->maxlen)
2903 newlen = table->maxlen;
2904 length = newlen / sizeof(int);
2905
2906 for (i = 0; i < length; i++) {
2907 int value;
2908 if (get_user(value, vec + i))
2909 return -EFAULT;
2910 if (min && value < min[i])
2911 return -EINVAL;
2912 if (max && value > max[i])
2913 return -EINVAL;
2914 }
2915 }
2916 return 0;
2917}
2918
2919/* Strategy function to convert jiffies to seconds */
f221e726 2920int sysctl_jiffies(struct ctl_table *table,
1da177e4 2921 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2922 void __user *newval, size_t newlen)
1da177e4 2923{
3ee75ac3 2924 if (oldval && oldlenp) {
1da177e4 2925 size_t olen;
3ee75ac3
AD		 2926
2927 if (get_user(olen, oldlenp))
2928 return -EFAULT;
2929 if (olen) {
2930 int val;
2931
2932 if (olen < sizeof(int))
2933 return -EINVAL;
2934
2935 val = *(int *)(table->data) / HZ;
2936 if (put_user(val, (int __user *)oldval))
2937 return -EFAULT;
2938 if (put_user(sizeof(int), oldlenp))
1da177e4 2939 return -EFAULT;
1da177e4 2940 }
1da177e4
LT		 2941 }
2942 if (newval && newlen) {
2943 int new;
2944 if (newlen != sizeof(int))
2945 return -EINVAL;
2946 if (get_user(new, (int __user *)newval))
2947 return -EFAULT;
2948 *(int *)(table->data) = new*HZ;
2949 }
2950 return 1;
2951}
2952
2953/* Strategy function to convert jiffies to seconds */
f221e726 2954int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 2955 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2956 void __user *newval, size_t newlen)
1da177e4 2957{
3ee75ac3 2958 if (oldval && oldlenp) {
1da177e4 2959 size_t olen;
3ee75ac3
AD		 2960
2961 if (get_user(olen, oldlenp))
2962 return -EFAULT;
2963 if (olen) {
2964 int val;
2965
2966 if (olen < sizeof(int))
2967 return -EINVAL;
2968
2969 val = jiffies_to_msecs(*(int *)(table->data));
2970 if (put_user(val, (int __user *)oldval))
2971 return -EFAULT;
2972 if (put_user(sizeof(int), oldlenp))
1da177e4 2973 return -EFAULT;
1da177e4 2974 }
1da177e4
LT		 2975 }
2976 if (newval && newlen) {
2977 int new;
2978 if (newlen != sizeof(int))
2979 return -EINVAL;
2980 if (get_user(new, (int __user *)newval))
2981 return -EFAULT;
2982 *(int *)(table->data) = msecs_to_jiffies(new);
2983 }
2984 return 1;
2985}
2986
c4b8b769 2987
c4b8b769 2988
b89a8171 2989#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 2990
2991
1e7bfb21 2992SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 2993{
0e009be8 2994 struct __sysctl_args tmp;
7058cb02 2995 int error;
0e009be8 2996
0e009be8
EB		 2997 if (copy_from_user(&tmp, args, sizeof(tmp)))
2998 return -EFAULT;
0e009be8 2999
7058cb02 3000 error = deprecated_sysctl_warning(&tmp);
b89a8171 3001
7058cb02
EB		 3002 /* If no error reading the parameters then just -ENOSYS ... */
3003 if (!error)
3004 error = -ENOSYS;
3005
3006 return error;
1da177e4
LT		 3007}
3008
f221e726 3009int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3010 void __user *oldval, size_t __user *oldlenp,
3011 void __user *newval, size_t newlen)
3012{
3013 return -ENOSYS;
3014}
3015
f221e726 3016int sysctl_string(struct ctl_table *table,
1da177e4 3017 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3018 void __user *newval, size_t newlen)
1da177e4
LT		 3019{
3020 return -ENOSYS;
3021}
3022
f221e726 3023int sysctl_intvec(struct ctl_table *table,
1da177e4 3024 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3025 void __user *newval, size_t newlen)
1da177e4
LT		 3026{
3027 return -ENOSYS;
3028}
3029
f221e726 3030int sysctl_jiffies(struct ctl_table *table,
1da177e4 3031 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3032 void __user *newval, size_t newlen)
1da177e4
LT		 3033{
3034 return -ENOSYS;
3035}
3036
f221e726 3037int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3038 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3039 void __user *newval, size_t newlen)
1da177e4
LT		 3040{
3041 return -ENOSYS;
3042}
3043
b89a8171 3044#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3045
7058cb02
EB		 3046static int deprecated_sysctl_warning(struct __sysctl_args *args)
3047{
3048 static int msg_count;
3049 int name[CTL_MAXNAME];
3050 int i;
3051
6fc48af8
TH		 3052 /* Check args->nlen. */
3053 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3054 return -ENOTDIR;
3055
7058cb02
EB		 3056 /* Read in the sysctl name for better debug message logging */
3057 for (i = 0; i < args->nlen; i++)
3058 if (get_user(name[i], args->name + i))
3059 return -EFAULT;
3060
3061 /* Ignore accesses to kernel.version */
3062 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3063 return 0;
3064
3065 if (msg_count < 5) {
3066 msg_count++;
3067 printk(KERN_INFO
3068 "warning: process `%s' used the deprecated sysctl "
3069 "system call with ", current->comm);
3070 for (i = 0; i < args->nlen; i++)
3071 printk("%d.", name[i]);
3072 printk("\n");
3073 }
3074 return 0;
3075}
3076
1da177e4
LT		 3077/*
3078 * No sense putting this after each symbol definition, twice,
3079 * exception granted :-)
3080 */
3081EXPORT_SYMBOL(proc_dointvec);
3082EXPORT_SYMBOL(proc_dointvec_jiffies);
3083EXPORT_SYMBOL(proc_dointvec_minmax);
3084EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3085EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3086EXPORT_SYMBOL(proc_dostring);
3087EXPORT_SYMBOL(proc_doulongvec_minmax);
3088EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3089EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3090EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3091EXPORT_SYMBOL(sysctl_intvec);
3092EXPORT_SYMBOL(sysctl_jiffies);
3093EXPORT_SYMBOL(sysctl_ms_jiffies);
3094EXPORT_SYMBOL(sysctl_string);
49a0c458 3095EXPORT_SYMBOL(sysctl_data);
1da177e4 3096EXPORT_SYMBOL(unregister_sysctl_table);
kernel source for telekom puls (alcatel/mediatek)