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hpet: fix the possibility of insane return value of hpet_calibrate() against SMI
[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;
fc3501d4 104static unsigned long one_ul = 1;
c4f3b63f
RT		 105static int one_hundred = 100;
106
1da177e4
LT		 107/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
108static int maxolduid = 65535;
109static int minolduid;
8ad4b1fb 110static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 111
112static int ngroups_max = NGROUPS_MAX;
113
a1ef5adb 114#ifdef CONFIG_MODULES
1da177e4
LT		 115extern char modprobe_path[];
116#endif
1da177e4
LT		 117#ifdef CONFIG_CHR_DEV_SG
118extern int sg_big_buff;
119#endif
1da177e4 120
72c57ed5 121#ifdef CONFIG_SPARC
17f04fbb 122#include <asm/system.h>
1da177e4
LT		 123#endif
124
0871420f
DM		 125#ifdef CONFIG_SPARC64
126extern int sysctl_tsb_ratio;
127#endif
128
1da177e4
LT		 129#ifdef __hppa__
130extern int pwrsw_enabled;
131extern int unaligned_enabled;
132#endif
133
347a8dc3 134#ifdef CONFIG_S390
1da177e4
LT		 135#ifdef CONFIG_MATHEMU
136extern int sysctl_ieee_emulation_warnings;
137#endif
138extern int sysctl_userprocess_debug;
951f22d5 139extern int spin_retry;
1da177e4
LT		 140#endif
141
1da177e4
LT		 142#ifdef CONFIG_BSD_PROCESS_ACCT
143extern int acct_parm[];
144#endif
145
d2b176ed
JS		 146#ifdef CONFIG_IA64
147extern int no_unaligned_warning;
88fc241f 148extern int unaligned_dump_stack;
d2b176ed
JS		 149#endif
150
23f78d4a
IM		 151#ifdef CONFIG_RT_MUTEXES
152extern int max_lock_depth;
153#endif
154
d6f8ff73 155#ifdef CONFIG_PROC_SYSCTL
d8217f07 156static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 157 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 158static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 159 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 160#endif
9ec52099 161
d8217f07 162static struct ctl_table root_table[];
e51b6ba0
EB		 163static struct ctl_table_root sysctl_table_root;
164static struct ctl_table_header root_table_header = {
b380b0d4 165 .count = 1,
e51b6ba0 166 .ctl_table = root_table,
73455092 167 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 168 .root = &sysctl_table_root,
73455092 169 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 170};
171static struct ctl_table_root sysctl_table_root = {
172 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 173 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 174};
1da177e4 175
d8217f07
EB		 176static struct ctl_table kern_table[];
177static struct ctl_table vm_table[];
178static struct ctl_table fs_table[];
179static struct ctl_table debug_table[];
180static struct ctl_table dev_table[];
181extern struct ctl_table random_table[];
2d9048e2 182#ifdef CONFIG_INOTIFY_USER
d8217f07 183extern struct ctl_table inotify_table[];
0399cb08 184#endif
7ef9964e
DL		 185#ifdef CONFIG_EPOLL
186extern struct ctl_table epoll_table[];
187#endif
1da177e4
LT		 188
189#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
190int sysctl_legacy_va_layout;
191#endif
192
f20786ff
PZ		 193extern int prove_locking;
194extern int lock_stat;
9bc9a6bd 195
1da177e4
LT		 196/* The default sysctl tables: */
197
d8217f07 198static struct ctl_table root_table[] = {
1da177e4
LT		 199 {
200 .ctl_name = CTL_KERN,
201 .procname = "kernel",
202 .mode = 0555,
203 .child = kern_table,
204 },
205 {
206 .ctl_name = CTL_VM,
207 .procname = "vm",
208 .mode = 0555,
209 .child = vm_table,
210 },
1da177e4
LT		 211 {
212 .ctl_name = CTL_FS,
213 .procname = "fs",
214 .mode = 0555,
215 .child = fs_table,
216 },
217 {
218 .ctl_name = CTL_DEBUG,
219 .procname = "debug",
220 .mode = 0555,
221 .child = debug_table,
222 },
223 {
224 .ctl_name = CTL_DEV,
225 .procname = "dev",
226 .mode = 0555,
227 .child = dev_table,
228 },
2be7fe07
AM		 229/*
230 * NOTE: do not add new entries to this table unless you have read
231 * Documentation/sysctl/ctl_unnumbered.txt
232 */
1da177e4
LT		 233 { .ctl_name = 0 }
234};
235
77e54a1f 236#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 237static int min_sched_granularity_ns = 100000; /* 100 usecs */
238static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
239static int min_wakeup_granularity_ns; /* 0 usecs */
240static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 241#endif
242
d8217f07 243static struct ctl_table kern_table[] = {
77e54a1f
IM		 244#ifdef CONFIG_SCHED_DEBUG
245 {
246 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 247 .procname = "sched_min_granularity_ns",
248 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 249 .maxlen = sizeof(unsigned int),
250 .mode = 0644,
b2be5e96
PZ		 251 .proc_handler = &sched_nr_latency_handler,
252 .strategy = &sysctl_intvec,
253 .extra1 = &min_sched_granularity_ns,
254 .extra2 = &max_sched_granularity_ns,
77e54a1f 255 },
21805085
PZ		 256 {
257 .ctl_name = CTL_UNNUMBERED,
258 .procname = "sched_latency_ns",
259 .data = &sysctl_sched_latency,
260 .maxlen = sizeof(unsigned int),
261 .mode = 0644,
b2be5e96 262 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 263 .strategy = &sysctl_intvec,
264 .extra1 = &min_sched_granularity_ns,
265 .extra2 = &max_sched_granularity_ns,
266 },
77e54a1f
IM		 267 {
268 .ctl_name = CTL_UNNUMBERED,
269 .procname = "sched_wakeup_granularity_ns",
270 .data = &sysctl_sched_wakeup_granularity,
271 .maxlen = sizeof(unsigned int),
272 .mode = 0644,
273 .proc_handler = &proc_dointvec_minmax,
274 .strategy = &sysctl_intvec,
77e54a1f
IM		 275 .extra1 = &min_wakeup_granularity_ns,
276 .extra2 = &max_wakeup_granularity_ns,
277 },
2398f2c6
PZ		 278 {
279 .ctl_name = CTL_UNNUMBERED,
280 .procname = "sched_shares_ratelimit",
281 .data = &sysctl_sched_shares_ratelimit,
282 .maxlen = sizeof(unsigned int),
283 .mode = 0644,
284 .proc_handler = &proc_dointvec,
285 },
ffda12a1
PZ		 286 {
287 .ctl_name = CTL_UNNUMBERED,
288 .procname = "sched_shares_thresh",
289 .data = &sysctl_sched_shares_thresh,
290 .maxlen = sizeof(unsigned int),
291 .mode = 0644,
292 .proc_handler = &proc_dointvec_minmax,
293 .strategy = &sysctl_intvec,
294 .extra1 = &zero,
295 },
77e54a1f
IM		 296 {
297 .ctl_name = CTL_UNNUMBERED,
298 .procname = "sched_child_runs_first",
299 .data = &sysctl_sched_child_runs_first,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
302 .proc_handler = &proc_dointvec,
303 },
1fc84aaa
PZ		 304 {
305 .ctl_name = CTL_UNNUMBERED,
306 .procname = "sched_features",
307 .data = &sysctl_sched_features,
308 .maxlen = sizeof(unsigned int),
309 .mode = 0644,
310 .proc_handler = &proc_dointvec,
311 },
da84d961
IM		 312 {
313 .ctl_name = CTL_UNNUMBERED,
314 .procname = "sched_migration_cost",
315 .data = &sysctl_sched_migration_cost,
316 .maxlen = sizeof(unsigned int),
317 .mode = 0644,
318 .proc_handler = &proc_dointvec,
319 },
b82d9fdd
PZ		 320 {
321 .ctl_name = CTL_UNNUMBERED,
322 .procname = "sched_nr_migrate",
323 .data = &sysctl_sched_nr_migrate,
324 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 325 .mode = 0644,
326 .proc_handler = &proc_dointvec,
327 },
1fc84aaa 328#endif
9f0c1e56
PZ		 329 {
330 .ctl_name = CTL_UNNUMBERED,
331 .procname = "sched_rt_period_us",
332 .data = &sysctl_sched_rt_period,
333 .maxlen = sizeof(unsigned int),
334 .mode = 0644,
d0b27fa7 335 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 336 },
337 {
338 .ctl_name = CTL_UNNUMBERED,
339 .procname = "sched_rt_runtime_us",
340 .data = &sysctl_sched_rt_runtime,
341 .maxlen = sizeof(int),
342 .mode = 0644,
d0b27fa7 343 .proc_handler = &sched_rt_handler,
9f0c1e56 344 },
1799e35d
IM		 345 {
346 .ctl_name = CTL_UNNUMBERED,
347 .procname = "sched_compat_yield",
348 .data = &sysctl_sched_compat_yield,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
351 .proc_handler = &proc_dointvec,
352 },
f20786ff
PZ		 353#ifdef CONFIG_PROVE_LOCKING
354 {
355 .ctl_name = CTL_UNNUMBERED,
356 .procname = "prove_locking",
357 .data = &prove_locking,
358 .maxlen = sizeof(int),
359 .mode = 0644,
360 .proc_handler = &proc_dointvec,
361 },
362#endif
363#ifdef CONFIG_LOCK_STAT
364 {
365 .ctl_name = CTL_UNNUMBERED,
366 .procname = "lock_stat",
367 .data = &lock_stat,
368 .maxlen = sizeof(int),
369 .mode = 0644,
370 .proc_handler = &proc_dointvec,
371 },
77e54a1f 372#endif
1da177e4
LT		 373 {
374 .ctl_name = KERN_PANIC,
375 .procname = "panic",
376 .data = &panic_timeout,
377 .maxlen = sizeof(int),
378 .mode = 0644,
379 .proc_handler = &proc_dointvec,
380 },
381 {
382 .ctl_name = KERN_CORE_USES_PID,
383 .procname = "core_uses_pid",
384 .data = &core_uses_pid,
385 .maxlen = sizeof(int),
386 .mode = 0644,
387 .proc_handler = &proc_dointvec,
388 },
389 {
390 .ctl_name = KERN_CORE_PATTERN,
391 .procname = "core_pattern",
392 .data = core_pattern,
71ce92f3 393 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 394 .mode = 0644,
395 .proc_handler = &proc_dostring,
396 .strategy = &sysctl_string,
397 },
34f5a398 398#ifdef CONFIG_PROC_SYSCTL
1da177e4 399 {
1da177e4 400 .procname = "tainted",
25ddbb18 401 .maxlen = sizeof(long),
34f5a398 402 .mode = 0644,
25ddbb18 403 .proc_handler = &proc_taint,
1da177e4 404 },
34f5a398 405#endif
9745512c
AV		 406#ifdef CONFIG_LATENCYTOP
407 {
408 .procname = "latencytop",
409 .data = &latencytop_enabled,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = &proc_dointvec,
413 },
414#endif
1da177e4
LT		 415#ifdef CONFIG_BLK_DEV_INITRD
416 {
417 .ctl_name = KERN_REALROOTDEV,
418 .procname = "real-root-dev",
419 .data = &real_root_dev,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = &proc_dointvec,
423 },
424#endif
45807a1d
IM		 425 {
426 .ctl_name = CTL_UNNUMBERED,
427 .procname = "print-fatal-signals",
428 .data = &print_fatal_signals,
429 .maxlen = sizeof(int),
430 .mode = 0644,
431 .proc_handler = &proc_dointvec,
432 },
72c57ed5 433#ifdef CONFIG_SPARC
1da177e4
LT		 434 {
435 .ctl_name = KERN_SPARC_REBOOT,
436 .procname = "reboot-cmd",
437 .data = reboot_command,
438 .maxlen = 256,
439 .mode = 0644,
440 .proc_handler = &proc_dostring,
441 .strategy = &sysctl_string,
442 },
443 {
444 .ctl_name = KERN_SPARC_STOP_A,
445 .procname = "stop-a",
446 .data = &stop_a_enabled,
447 .maxlen = sizeof (int),
448 .mode = 0644,
449 .proc_handler = &proc_dointvec,
450 },
451 {
452 .ctl_name = KERN_SPARC_SCONS_PWROFF,
453 .procname = "scons-poweroff",
454 .data = &scons_pwroff,
455 .maxlen = sizeof (int),
456 .mode = 0644,
457 .proc_handler = &proc_dointvec,
458 },
459#endif
0871420f
DM		 460#ifdef CONFIG_SPARC64
461 {
462 .ctl_name = CTL_UNNUMBERED,
463 .procname = "tsb-ratio",
464 .data = &sysctl_tsb_ratio,
465 .maxlen = sizeof (int),
466 .mode = 0644,
467 .proc_handler = &proc_dointvec,
468 },
469#endif
1da177e4
LT		 470#ifdef __hppa__
471 {
472 .ctl_name = KERN_HPPA_PWRSW,
473 .procname = "soft-power",
474 .data = &pwrsw_enabled,
475 .maxlen = sizeof (int),
476 .mode = 0644,
477 .proc_handler = &proc_dointvec,
478 },
479 {
480 .ctl_name = KERN_HPPA_UNALIGNED,
481 .procname = "unaligned-trap",
482 .data = &unaligned_enabled,
483 .maxlen = sizeof (int),
484 .mode = 0644,
485 .proc_handler = &proc_dointvec,
486 },
487#endif
488 {
489 .ctl_name = KERN_CTLALTDEL,
490 .procname = "ctrl-alt-del",
491 .data = &C_A_D,
492 .maxlen = sizeof(int),
493 .mode = 0644,
494 .proc_handler = &proc_dointvec,
495 },
606576ce 496#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 497 {
498 .ctl_name = CTL_UNNUMBERED,
499 .procname = "ftrace_enabled",
500 .data = &ftrace_enabled,
501 .maxlen = sizeof(int),
502 .mode = 0644,
503 .proc_handler = &ftrace_enable_sysctl,
504 },
505#endif
f38f1d2a
SR		 506#ifdef CONFIG_STACK_TRACER
507 {
508 .ctl_name = CTL_UNNUMBERED,
509 .procname = "stack_tracer_enabled",
510 .data = &stack_tracer_enabled,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = &stack_trace_sysctl,
514 },
515#endif
944ac425
SR		 516#ifdef CONFIG_TRACING
517 {
518 .ctl_name = CTL_UNNUMBERED,
3299b4dd 519 .procname = "ftrace_dump_on_oops",
944ac425
SR		 520 .data = &ftrace_dump_on_oops,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = &proc_dointvec,
524 },
525#endif
a1ef5adb 526#ifdef CONFIG_MODULES
1da177e4
LT		 527 {
528 .ctl_name = KERN_MODPROBE,
529 .procname = "modprobe",
530 .data = &modprobe_path,
531 .maxlen = KMOD_PATH_LEN,
532 .mode = 0644,
533 .proc_handler = &proc_dostring,
534 .strategy = &sysctl_string,
535 },
536#endif
57ae2508 537#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 538 {
539 .ctl_name = KERN_HOTPLUG,
540 .procname = "hotplug",
312c004d
KS		 541 .data = &uevent_helper,
542 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 543 .mode = 0644,
544 .proc_handler = &proc_dostring,
545 .strategy = &sysctl_string,
546 },
547#endif
548#ifdef CONFIG_CHR_DEV_SG
549 {
550 .ctl_name = KERN_SG_BIG_BUFF,
551 .procname = "sg-big-buff",
552 .data = &sg_big_buff,
553 .maxlen = sizeof (int),
554 .mode = 0444,
555 .proc_handler = &proc_dointvec,
556 },
557#endif
558#ifdef CONFIG_BSD_PROCESS_ACCT
559 {
560 .ctl_name = KERN_ACCT,
561 .procname = "acct",
562 .data = &acct_parm,
563 .maxlen = 3*sizeof(int),
564 .mode = 0644,
565 .proc_handler = &proc_dointvec,
566 },
567#endif
1da177e4
LT		 568#ifdef CONFIG_MAGIC_SYSRQ
569 {
570 .ctl_name = KERN_SYSRQ,
571 .procname = "sysrq",
5d6f647f 572 .data = &__sysrq_enabled,
1da177e4
LT		 573 .maxlen = sizeof (int),
574 .mode = 0644,
575 .proc_handler = &proc_dointvec,
576 },
577#endif
d6f8ff73 578#ifdef CONFIG_PROC_SYSCTL
1da177e4 579 {
1da177e4 580 .procname = "cad_pid",
9ec52099 581 .data = NULL,
1da177e4
LT		 582 .maxlen = sizeof (int),
583 .mode = 0600,
9ec52099 584 .proc_handler = &proc_do_cad_pid,
1da177e4 585 },
d6f8ff73 586#endif
1da177e4
LT		 587 {
588 .ctl_name = KERN_MAX_THREADS,
589 .procname = "threads-max",
590 .data = &max_threads,
591 .maxlen = sizeof(int),
592 .mode = 0644,
593 .proc_handler = &proc_dointvec,
594 },
595 {
596 .ctl_name = KERN_RANDOM,
597 .procname = "random",
598 .mode = 0555,
599 .child = random_table,
600 },
1da177e4
LT		 601 {
602 .ctl_name = KERN_OVERFLOWUID,
603 .procname = "overflowuid",
604 .data = &overflowuid,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = &proc_dointvec_minmax,
608 .strategy = &sysctl_intvec,
609 .extra1 = &minolduid,
610 .extra2 = &maxolduid,
611 },
612 {
613 .ctl_name = KERN_OVERFLOWGID,
614 .procname = "overflowgid",
615 .data = &overflowgid,
616 .maxlen = sizeof(int),
617 .mode = 0644,
618 .proc_handler = &proc_dointvec_minmax,
619 .strategy = &sysctl_intvec,
620 .extra1 = &minolduid,
621 .extra2 = &maxolduid,
622 },
347a8dc3 623#ifdef CONFIG_S390
1da177e4
LT		 624#ifdef CONFIG_MATHEMU
625 {
626 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
627 .procname = "ieee_emulation_warnings",
628 .data = &sysctl_ieee_emulation_warnings,
629 .maxlen = sizeof(int),
630 .mode = 0644,
631 .proc_handler = &proc_dointvec,
632 },
1da177e4
LT		 633#endif
634 {
635 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
636 .procname = "userprocess_debug",
637 .data = &sysctl_userprocess_debug,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = &proc_dointvec,
641 },
642#endif
643 {
644 .ctl_name = KERN_PIDMAX,
645 .procname = "pid_max",
646 .data = &pid_max,
647 .maxlen = sizeof (int),
648 .mode = 0644,
649 .proc_handler = &proc_dointvec_minmax,
650 .strategy = sysctl_intvec,
651 .extra1 = &pid_max_min,
652 .extra2 = &pid_max_max,
653 },
654 {
655 .ctl_name = KERN_PANIC_ON_OOPS,
656 .procname = "panic_on_oops",
657 .data = &panic_on_oops,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = &proc_dointvec,
661 },
7ef3d2fd
JP		 662#if defined CONFIG_PRINTK
663 {
664 .ctl_name = KERN_PRINTK,
665 .procname = "printk",
666 .data = &console_loglevel,
667 .maxlen = 4*sizeof(int),
668 .mode = 0644,
669 .proc_handler = &proc_dointvec,
670 },
1da177e4
LT		 671 {
672 .ctl_name = KERN_PRINTK_RATELIMIT,
673 .procname = "printk_ratelimit",
717115e1 674 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 675 .maxlen = sizeof(int),
676 .mode = 0644,
677 .proc_handler = &proc_dointvec_jiffies,
678 .strategy = &sysctl_jiffies,
679 },
680 {
681 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
682 .procname = "printk_ratelimit_burst",
717115e1 683 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 684 .maxlen = sizeof(int),
685 .mode = 0644,
686 .proc_handler = &proc_dointvec,
687 },
7ef3d2fd 688#endif
1da177e4
LT		 689 {
690 .ctl_name = KERN_NGROUPS_MAX,
691 .procname = "ngroups_max",
692 .data = &ngroups_max,
693 .maxlen = sizeof (int),
694 .mode = 0444,
695 .proc_handler = &proc_dointvec,
696 },
697#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
698 {
699 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
700 .procname = "unknown_nmi_panic",
701 .data = &unknown_nmi_panic,
702 .maxlen = sizeof (int),
703 .mode = 0644,
2fbe7b25 704 .proc_handler = &proc_dointvec,
1da177e4 705 },
407984f1 706 {
407984f1
DZ		 707 .procname = "nmi_watchdog",
708 .data = &nmi_watchdog_enabled,
709 .maxlen = sizeof (int),
710 .mode = 0644,
711 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 712 },
713#endif
714#if defined(CONFIG_X86)
8da5adda
DZ		 715 {
716 .ctl_name = KERN_PANIC_ON_NMI,
717 .procname = "panic_on_unrecovered_nmi",
718 .data = &panic_on_unrecovered_nmi,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = &proc_dointvec,
722 },
1da177e4
LT		 723 {
724 .ctl_name = KERN_BOOTLOADER_TYPE,
725 .procname = "bootloader_type",
726 .data = &bootloader_type,
727 .maxlen = sizeof (int),
728 .mode = 0444,
729 .proc_handler = &proc_dointvec,
730 },
0741f4d2
CE		 731 {
732 .ctl_name = CTL_UNNUMBERED,
733 .procname = "kstack_depth_to_print",
734 .data = &kstack_depth_to_print,
735 .maxlen = sizeof(int),
736 .mode = 0644,
737 .proc_handler = &proc_dointvec,
738 },
6e7c4025
IM		 739 {
740 .ctl_name = CTL_UNNUMBERED,
741 .procname = "io_delay_type",
742 .data = &io_delay_type,
743 .maxlen = sizeof(int),
744 .mode = 0644,
745 .proc_handler = &proc_dointvec,
746 },
1da177e4 747#endif
7a9166e3 748#if defined(CONFIG_MMU)
1da177e4
LT		 749 {
750 .ctl_name = KERN_RANDOMIZE,
751 .procname = "randomize_va_space",
752 .data = &randomize_va_space,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = &proc_dointvec,
756 },
7a9166e3 757#endif
0152fb37 758#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 759 {
760 .ctl_name = KERN_SPIN_RETRY,
761 .procname = "spin_retry",
762 .data = &spin_retry,
763 .maxlen = sizeof (int),
764 .mode = 0644,
765 .proc_handler = &proc_dointvec,
766 },
c255d844 767#endif
673d5b43 768#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 769 {
c255d844 770 .procname = "acpi_video_flags",
77afcf78 771 .data = &acpi_realmode_flags,
c255d844
PM		 772 .maxlen = sizeof (unsigned long),
773 .mode = 0644,
7f99f06f 774 .proc_handler = &proc_doulongvec_minmax,
c255d844 775 },
d2b176ed
JS		 776#endif
777#ifdef CONFIG_IA64
778 {
779 .ctl_name = KERN_IA64_UNALIGNED,
780 .procname = "ignore-unaligned-usertrap",
781 .data = &no_unaligned_warning,
782 .maxlen = sizeof (int),
783 .mode = 0644,
784 .proc_handler = &proc_dointvec,
785 },
88fc241f
DC		 786 {
787 .ctl_name = CTL_UNNUMBERED,
788 .procname = "unaligned-dump-stack",
789 .data = &unaligned_dump_stack,
790 .maxlen = sizeof (int),
791 .mode = 0644,
792 .proc_handler = &proc_dointvec,
793 },
bebfa101 794#endif
c4f3b63f 795#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 796 {
797 .ctl_name = CTL_UNNUMBERED,
798 .procname = "softlockup_panic",
799 .data = &softlockup_panic,
800 .maxlen = sizeof(int),
801 .mode = 0644,
4dca10a9 802 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 803 .strategy = &sysctl_intvec,
804 .extra1 = &zero,
805 .extra2 = &one,
806 },
c4f3b63f
RT		 807 {
808 .ctl_name = CTL_UNNUMBERED,
809 .procname = "softlockup_thresh",
810 .data = &softlockup_thresh,
9383d967 811 .maxlen = sizeof(int),
c4f3b63f 812 .mode = 0644,
baf48f65 813 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 814 .strategy = &sysctl_intvec,
9383d967 815 .extra1 = &neg_one,
c4f3b63f
RT		 816 .extra2 = &sixty,
817 },
82a1fcb9
IM		 818 {
819 .ctl_name = CTL_UNNUMBERED,
820 .procname = "hung_task_check_count",
821 .data = &sysctl_hung_task_check_count,
90739081 822 .maxlen = sizeof(unsigned long),
82a1fcb9 823 .mode = 0644,
90739081 824 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 825 .strategy = &sysctl_intvec,
826 },
827 {
828 .ctl_name = CTL_UNNUMBERED,
829 .procname = "hung_task_timeout_secs",
830 .data = &sysctl_hung_task_timeout_secs,
90739081 831 .maxlen = sizeof(unsigned long),
82a1fcb9 832 .mode = 0644,
90739081 833 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 834 .strategy = &sysctl_intvec,
835 },
836 {
837 .ctl_name = CTL_UNNUMBERED,
838 .procname = "hung_task_warnings",
839 .data = &sysctl_hung_task_warnings,
90739081 840 .maxlen = sizeof(unsigned long),
82a1fcb9 841 .mode = 0644,
90739081 842 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 843 .strategy = &sysctl_intvec,
844 },
c4f3b63f 845#endif
bebfa101
AK		 846#ifdef CONFIG_COMPAT
847 {
848 .ctl_name = KERN_COMPAT_LOG,
849 .procname = "compat-log",
850 .data = &compat_log,
851 .maxlen = sizeof (int),
852 .mode = 0644,
853 .proc_handler = &proc_dointvec,
854 },
951f22d5 855#endif
23f78d4a
IM		 856#ifdef CONFIG_RT_MUTEXES
857 {
858 .ctl_name = KERN_MAX_LOCK_DEPTH,
859 .procname = "max_lock_depth",
860 .data = &max_lock_depth,
861 .maxlen = sizeof(int),
862 .mode = 0644,
863 .proc_handler = &proc_dointvec,
864 },
5096add8 865#endif
10a0a8d4
JF		 866 {
867 .ctl_name = CTL_UNNUMBERED,
868 .procname = "poweroff_cmd",
869 .data = &poweroff_cmd,
870 .maxlen = POWEROFF_CMD_PATH_LEN,
871 .mode = 0644,
872 .proc_handler = &proc_dostring,
873 .strategy = &sysctl_string,
874 },
0b77f5bf
DH		 875#ifdef CONFIG_KEYS
876 {
877 .ctl_name = CTL_UNNUMBERED,
878 .procname = "keys",
879 .mode = 0555,
880 .child = key_sysctls,
881 },
882#endif
31a72bce
PM		 883#ifdef CONFIG_RCU_TORTURE_TEST
884 {
885 .ctl_name = CTL_UNNUMBERED,
886 .procname = "rcutorture_runnable",
887 .data = &rcutorture_runnable,
888 .maxlen = sizeof(int),
889 .mode = 0644,
890 .proc_handler = &proc_dointvec,
891 },
892#endif
af936a16
LS		 893#ifdef CONFIG_UNEVICTABLE_LRU
894 {
895 .ctl_name = CTL_UNNUMBERED,
896 .procname = "scan_unevictable_pages",
897 .data = &scan_unevictable_pages,
898 .maxlen = sizeof(scan_unevictable_pages),
899 .mode = 0644,
900 .proc_handler = &scan_unevictable_handler,
901 },
902#endif
ed2c12f3
AM		 903/*
904 * NOTE: do not add new entries to this table unless you have read
905 * Documentation/sysctl/ctl_unnumbered.txt
906 */
1da177e4
LT		 907 { .ctl_name = 0 }
908};
909
d8217f07 910static struct ctl_table vm_table[] = {
1da177e4
LT		 911 {
912 .ctl_name = VM_OVERCOMMIT_MEMORY,
913 .procname = "overcommit_memory",
914 .data = &sysctl_overcommit_memory,
915 .maxlen = sizeof(sysctl_overcommit_memory),
916 .mode = 0644,
917 .proc_handler = &proc_dointvec,
918 },
fadd8fbd
KH		 919 {
920 .ctl_name = VM_PANIC_ON_OOM,
921 .procname = "panic_on_oom",
922 .data = &sysctl_panic_on_oom,
923 .maxlen = sizeof(sysctl_panic_on_oom),
924 .mode = 0644,
925 .proc_handler = &proc_dointvec,
926 },
fe071d7e
DR		 927 {
928 .ctl_name = CTL_UNNUMBERED,
929 .procname = "oom_kill_allocating_task",
930 .data = &sysctl_oom_kill_allocating_task,
931 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
932 .mode = 0644,
933 .proc_handler = &proc_dointvec,
934 },
fef1bdd6
DR		 935 {
936 .ctl_name = CTL_UNNUMBERED,
937 .procname = "oom_dump_tasks",
938 .data = &sysctl_oom_dump_tasks,
939 .maxlen = sizeof(sysctl_oom_dump_tasks),
940 .mode = 0644,
941 .proc_handler = &proc_dointvec,
942 },
1da177e4
LT		 943 {
944 .ctl_name = VM_OVERCOMMIT_RATIO,
945 .procname = "overcommit_ratio",
946 .data = &sysctl_overcommit_ratio,
947 .maxlen = sizeof(sysctl_overcommit_ratio),
948 .mode = 0644,
949 .proc_handler = &proc_dointvec,
950 },
951 {
952 .ctl_name = VM_PAGE_CLUSTER,
953 .procname = "page-cluster",
954 .data = &page_cluster,
955 .maxlen = sizeof(int),
956 .mode = 0644,
957 .proc_handler = &proc_dointvec,
958 },
959 {
960 .ctl_name = VM_DIRTY_BACKGROUND,
961 .procname = "dirty_background_ratio",
962 .data = &dirty_background_ratio,
963 .maxlen = sizeof(dirty_background_ratio),
964 .mode = 0644,
2da02997 965 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 966 .strategy = &sysctl_intvec,
967 .extra1 = &zero,
968 .extra2 = &one_hundred,
969 },
2da02997
DR		 970 {
971 .ctl_name = CTL_UNNUMBERED,
972 .procname = "dirty_background_bytes",
973 .data = &dirty_background_bytes,
974 .maxlen = sizeof(dirty_background_bytes),
975 .mode = 0644,
976 .proc_handler = &dirty_background_bytes_handler,
977 .strategy = &sysctl_intvec,
fc3501d4 978 .extra1 = &one_ul,
2da02997 979 },
1da177e4
LT		 980 {
981 .ctl_name = VM_DIRTY_RATIO,
982 .procname = "dirty_ratio",
983 .data = &vm_dirty_ratio,
984 .maxlen = sizeof(vm_dirty_ratio),
985 .mode = 0644,
04fbfdc1 986 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 987 .strategy = &sysctl_intvec,
988 .extra1 = &zero,
989 .extra2 = &one_hundred,
990 },
2da02997
DR		 991 {
992 .ctl_name = CTL_UNNUMBERED,
993 .procname = "dirty_bytes",
994 .data = &vm_dirty_bytes,
995 .maxlen = sizeof(vm_dirty_bytes),
996 .mode = 0644,
997 .proc_handler = &dirty_bytes_handler,
998 .strategy = &sysctl_intvec,
fc3501d4 999 .extra1 = &one_ul,
2da02997 1000 },
1da177e4 1001 {
1da177e4 1002 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1003 .data = &dirty_writeback_interval,
1004 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1005 .mode = 0644,
1006 .proc_handler = &dirty_writeback_centisecs_handler,
1007 },
1008 {
1da177e4 1009 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1010 .data = &dirty_expire_interval,
1011 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1012 .mode = 0644,
704503d8 1013 .proc_handler = &proc_dointvec,
1da177e4
LT		 1014 },
1015 {
1016 .ctl_name = VM_NR_PDFLUSH_THREADS,
1017 .procname = "nr_pdflush_threads",
1018 .data = &nr_pdflush_threads,
1019 .maxlen = sizeof nr_pdflush_threads,
1020 .mode = 0444 /* read-only*/,
1021 .proc_handler = &proc_dointvec,
1022 },
1023 {
1024 .ctl_name = VM_SWAPPINESS,
1025 .procname = "swappiness",
1026 .data = &vm_swappiness,
1027 .maxlen = sizeof(vm_swappiness),
1028 .mode = 0644,
1029 .proc_handler = &proc_dointvec_minmax,
1030 .strategy = &sysctl_intvec,
1031 .extra1 = &zero,
1032 .extra2 = &one_hundred,
1033 },
1034#ifdef CONFIG_HUGETLB_PAGE
1035 {
1da177e4 1036 .procname = "nr_hugepages",
e5ff2159 1037 .data = NULL,
1da177e4
LT		 1038 .maxlen = sizeof(unsigned long),
1039 .mode = 0644,
1040 .proc_handler = &hugetlb_sysctl_handler,
1041 .extra1 = (void *)&hugetlb_zero,
1042 .extra2 = (void *)&hugetlb_infinity,
1043 },
1044 {
1045 .ctl_name = VM_HUGETLB_GROUP,
1046 .procname = "hugetlb_shm_group",
1047 .data = &sysctl_hugetlb_shm_group,
1048 .maxlen = sizeof(gid_t),
1049 .mode = 0644,
1050 .proc_handler = &proc_dointvec,
1051 },
396faf03
MG		 1052 {
1053 .ctl_name = CTL_UNNUMBERED,
1054 .procname = "hugepages_treat_as_movable",
1055 .data = &hugepages_treat_as_movable,
1056 .maxlen = sizeof(int),
1057 .mode = 0644,
1058 .proc_handler = &hugetlb_treat_movable_handler,
1059 },
d1c3fb1f
NA		 1060 {
1061 .ctl_name = CTL_UNNUMBERED,
1062 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1063 .data = NULL,
1064 .maxlen = sizeof(unsigned long),
d1c3fb1f 1065 .mode = 0644,
a3d0c6aa 1066 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1067 .extra1 = (void *)&hugetlb_zero,
1068 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1069 },
1da177e4
LT		 1070#endif
1071 {
1072 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1073 .procname = "lowmem_reserve_ratio",
1074 .data = &sysctl_lowmem_reserve_ratio,
1075 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1076 .mode = 0644,
1077 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1078 .strategy = &sysctl_intvec,
1079 },
9d0243bc
AM		 1080 {
1081 .ctl_name = VM_DROP_PAGECACHE,
1082 .procname = "drop_caches",
1083 .data = &sysctl_drop_caches,
1084 .maxlen = sizeof(int),
1085 .mode = 0644,
1086 .proc_handler = drop_caches_sysctl_handler,
1087 .strategy = &sysctl_intvec,
1088 },
1da177e4
LT		 1089 {
1090 .ctl_name = VM_MIN_FREE_KBYTES,
1091 .procname = "min_free_kbytes",
1092 .data = &min_free_kbytes,
1093 .maxlen = sizeof(min_free_kbytes),
1094 .mode = 0644,
1095 .proc_handler = &min_free_kbytes_sysctl_handler,
1096 .strategy = &sysctl_intvec,
1097 .extra1 = &zero,
1098 },
8ad4b1fb
RS		 1099 {
1100 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1101 .procname = "percpu_pagelist_fraction",
1102 .data = &percpu_pagelist_fraction,
1103 .maxlen = sizeof(percpu_pagelist_fraction),
1104 .mode = 0644,
1105 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1106 .strategy = &sysctl_intvec,
1107 .extra1 = &min_percpu_pagelist_fract,
1108 },
1da177e4
LT		 1109#ifdef CONFIG_MMU
1110 {
1111 .ctl_name = VM_MAX_MAP_COUNT,
1112 .procname = "max_map_count",
1113 .data = &sysctl_max_map_count,
1114 .maxlen = sizeof(sysctl_max_map_count),
1115 .mode = 0644,
1116 .proc_handler = &proc_dointvec
1117 },
dd8632a1
PM		 1118#else
1119 {
1120 .ctl_name = CTL_UNNUMBERED,
1121 .procname = "nr_trim_pages",
1122 .data = &sysctl_nr_trim_pages,
1123 .maxlen = sizeof(sysctl_nr_trim_pages),
1124 .mode = 0644,
1125 .proc_handler = &proc_dointvec_minmax,
1126 .strategy = &sysctl_intvec,
1127 .extra1 = &zero,
1128 },
1da177e4
LT		 1129#endif
1130 {
1131 .ctl_name = VM_LAPTOP_MODE,
1132 .procname = "laptop_mode",
1133 .data = &laptop_mode,
1134 .maxlen = sizeof(laptop_mode),
1135 .mode = 0644,
ed5b43f1
BS		 1136 .proc_handler = &proc_dointvec_jiffies,
1137 .strategy = &sysctl_jiffies,
1da177e4
LT		 1138 },
1139 {
1140 .ctl_name = VM_BLOCK_DUMP,
1141 .procname = "block_dump",
1142 .data = &block_dump,
1143 .maxlen = sizeof(block_dump),
1144 .mode = 0644,
1145 .proc_handler = &proc_dointvec,
1146 .strategy = &sysctl_intvec,
1147 .extra1 = &zero,
1148 },
1149 {
1150 .ctl_name = VM_VFS_CACHE_PRESSURE,
1151 .procname = "vfs_cache_pressure",
1152 .data = &sysctl_vfs_cache_pressure,
1153 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1154 .mode = 0644,
1155 .proc_handler = &proc_dointvec,
1156 .strategy = &sysctl_intvec,
1157 .extra1 = &zero,
1158 },
1159#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1160 {
1161 .ctl_name = VM_LEGACY_VA_LAYOUT,
1162 .procname = "legacy_va_layout",
1163 .data = &sysctl_legacy_va_layout,
1164 .maxlen = sizeof(sysctl_legacy_va_layout),
1165 .mode = 0644,
1166 .proc_handler = &proc_dointvec,
1167 .strategy = &sysctl_intvec,
1168 .extra1 = &zero,
1169 },
1170#endif
1743660b
CL		 1171#ifdef CONFIG_NUMA
1172 {
1173 .ctl_name = VM_ZONE_RECLAIM_MODE,
1174 .procname = "zone_reclaim_mode",
1175 .data = &zone_reclaim_mode,
1176 .maxlen = sizeof(zone_reclaim_mode),
1177 .mode = 0644,
1178 .proc_handler = &proc_dointvec,
c84db23c
CL		 1179 .strategy = &sysctl_intvec,
1180 .extra1 = &zero,
1743660b 1181 },
9614634f
CL		 1182 {
1183 .ctl_name = VM_MIN_UNMAPPED,
1184 .procname = "min_unmapped_ratio",
1185 .data = &sysctl_min_unmapped_ratio,
1186 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1187 .mode = 0644,
1188 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1189 .strategy = &sysctl_intvec,
1190 .extra1 = &zero,
1191 .extra2 = &one_hundred,
1192 },
0ff38490
CL		 1193 {
1194 .ctl_name = VM_MIN_SLAB,
1195 .procname = "min_slab_ratio",
1196 .data = &sysctl_min_slab_ratio,
1197 .maxlen = sizeof(sysctl_min_slab_ratio),
1198 .mode = 0644,
1199 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1200 .strategy = &sysctl_intvec,
1201 .extra1 = &zero,
1202 .extra2 = &one_hundred,
1203 },
e6e5494c 1204#endif
77461ab3
CL		 1205#ifdef CONFIG_SMP
1206 {
1207 .ctl_name = CTL_UNNUMBERED,
1208 .procname = "stat_interval",
1209 .data = &sysctl_stat_interval,
1210 .maxlen = sizeof(sysctl_stat_interval),
1211 .mode = 0644,
1212 .proc_handler = &proc_dointvec_jiffies,
1213 .strategy = &sysctl_jiffies,
1214 },
1215#endif
ed032189
EP		 1216#ifdef CONFIG_SECURITY
1217 {
1218 .ctl_name = CTL_UNNUMBERED,
1219 .procname = "mmap_min_addr",
1220 .data = &mmap_min_addr,
1221 .maxlen = sizeof(unsigned long),
1222 .mode = 0644,
1223 .proc_handler = &proc_doulongvec_minmax,
1224 },
8daec965 1225#endif
f0c0b2b8
KH		 1226#ifdef CONFIG_NUMA
1227 {
1228 .ctl_name = CTL_UNNUMBERED,
1229 .procname = "numa_zonelist_order",
1230 .data = &numa_zonelist_order,
1231 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1232 .mode = 0644,
1233 .proc_handler = &numa_zonelist_order_handler,
1234 .strategy = &sysctl_string,
1235 },
1236#endif
2b8232ce 1237#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1238 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1239 {
1240 .ctl_name = VM_VDSO_ENABLED,
1241 .procname = "vdso_enabled",
1242 .data = &vdso_enabled,
1243 .maxlen = sizeof(vdso_enabled),
1244 .mode = 0644,
1245 .proc_handler = &proc_dointvec,
1246 .strategy = &sysctl_intvec,
1247 .extra1 = &zero,
1248 },
1da177e4 1249#endif
195cf453
BG		 1250#ifdef CONFIG_HIGHMEM
1251 {
1252 .ctl_name = CTL_UNNUMBERED,
1253 .procname = "highmem_is_dirtyable",
1254 .data = &vm_highmem_is_dirtyable,
1255 .maxlen = sizeof(vm_highmem_is_dirtyable),
1256 .mode = 0644,
1257 .proc_handler = &proc_dointvec_minmax,
1258 .strategy = &sysctl_intvec,
1259 .extra1 = &zero,
1260 .extra2 = &one,
1261 },
1262#endif
2be7fe07
AM		 1263/*
1264 * NOTE: do not add new entries to this table unless you have read
1265 * Documentation/sysctl/ctl_unnumbered.txt
1266 */
1da177e4
LT		 1267 { .ctl_name = 0 }
1268};
1269
2abc26fc 1270#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1271static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1272 { .ctl_name = 0 }
1273};
1274#endif
1275
d8217f07 1276static struct ctl_table fs_table[] = {
1da177e4
LT		 1277 {
1278 .ctl_name = FS_NRINODE,
1279 .procname = "inode-nr",
1280 .data = &inodes_stat,
1281 .maxlen = 2*sizeof(int),
1282 .mode = 0444,
1283 .proc_handler = &proc_dointvec,
1284 },
1285 {
1286 .ctl_name = FS_STATINODE,
1287 .procname = "inode-state",
1288 .data = &inodes_stat,
1289 .maxlen = 7*sizeof(int),
1290 .mode = 0444,
1291 .proc_handler = &proc_dointvec,
1292 },
1293 {
1da177e4
LT		 1294 .procname = "file-nr",
1295 .data = &files_stat,
1296 .maxlen = 3*sizeof(int),
1297 .mode = 0444,
529bf6be 1298 .proc_handler = &proc_nr_files,
1da177e4
LT		 1299 },
1300 {
1301 .ctl_name = FS_MAXFILE,
1302 .procname = "file-max",
1303 .data = &files_stat.max_files,
1304 .maxlen = sizeof(int),
1305 .mode = 0644,
1306 .proc_handler = &proc_dointvec,
1307 },
9cfe015a
ED		 1308 {
1309 .ctl_name = CTL_UNNUMBERED,
1310 .procname = "nr_open",
1311 .data = &sysctl_nr_open,
1312 .maxlen = sizeof(int),
1313 .mode = 0644,
eceea0b3
AV		 1314 .proc_handler = &proc_dointvec_minmax,
1315 .extra1 = &sysctl_nr_open_min,
1316 .extra2 = &sysctl_nr_open_max,
9cfe015a 1317 },
1da177e4
LT		 1318 {
1319 .ctl_name = FS_DENTRY,
1320 .procname = "dentry-state",
1321 .data = &dentry_stat,
1322 .maxlen = 6*sizeof(int),
1323 .mode = 0444,
1324 .proc_handler = &proc_dointvec,
1325 },
1326 {
1327 .ctl_name = FS_OVERFLOWUID,
1328 .procname = "overflowuid",
1329 .data = &fs_overflowuid,
1330 .maxlen = sizeof(int),
1331 .mode = 0644,
1332 .proc_handler = &proc_dointvec_minmax,
1333 .strategy = &sysctl_intvec,
1334 .extra1 = &minolduid,
1335 .extra2 = &maxolduid,
1336 },
1337 {
1338 .ctl_name = FS_OVERFLOWGID,
1339 .procname = "overflowgid",
1340 .data = &fs_overflowgid,
1341 .maxlen = sizeof(int),
1342 .mode = 0644,
1343 .proc_handler = &proc_dointvec_minmax,
1344 .strategy = &sysctl_intvec,
1345 .extra1 = &minolduid,
1346 .extra2 = &maxolduid,
1347 },
bfcd17a6 1348#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1349 {
1350 .ctl_name = FS_LEASES,
1351 .procname = "leases-enable",
1352 .data = &leases_enable,
1353 .maxlen = sizeof(int),
1354 .mode = 0644,
1355 .proc_handler = &proc_dointvec,
1356 },
bfcd17a6 1357#endif
1da177e4
LT		 1358#ifdef CONFIG_DNOTIFY
1359 {
1360 .ctl_name = FS_DIR_NOTIFY,
1361 .procname = "dir-notify-enable",
1362 .data = &dir_notify_enable,
1363 .maxlen = sizeof(int),
1364 .mode = 0644,
1365 .proc_handler = &proc_dointvec,
1366 },
1367#endif
1368#ifdef CONFIG_MMU
bfcd17a6 1369#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1370 {
1371 .ctl_name = FS_LEASE_TIME,
1372 .procname = "lease-break-time",
1373 .data = &lease_break_time,
1374 .maxlen = sizeof(int),
1375 .mode = 0644,
76fdbb25
KH		 1376 .proc_handler = &proc_dointvec_minmax,
1377 .strategy = &sysctl_intvec,
1378 .extra1 = &zero,
1379 .extra2 = &two,
1da177e4 1380 },
bfcd17a6 1381#endif
ebf3f09c 1382#ifdef CONFIG_AIO
1da177e4 1383 {
1da177e4
LT		 1384 .procname = "aio-nr",
1385 .data = &aio_nr,
1386 .maxlen = sizeof(aio_nr),
1387 .mode = 0444,
d55b5fda 1388 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1389 },
1390 {
1da177e4
LT		 1391 .procname = "aio-max-nr",
1392 .data = &aio_max_nr,
1393 .maxlen = sizeof(aio_max_nr),
1394 .mode = 0644,
d55b5fda 1395 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1396 },
ebf3f09c 1397#endif /* CONFIG_AIO */
2d9048e2 1398#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1399 {
1400 .ctl_name = FS_INOTIFY,
1401 .procname = "inotify",
1402 .mode = 0555,
1403 .child = inotify_table,
1404 },
1405#endif
7ef9964e
DL		 1406#ifdef CONFIG_EPOLL
1407 {
1408 .procname = "epoll",
1409 .mode = 0555,
1410 .child = epoll_table,
1411 },
1412#endif
1da177e4 1413#endif
d6e71144
AC		 1414 {
1415 .ctl_name = KERN_SETUID_DUMPABLE,
1416 .procname = "suid_dumpable",
1417 .data = &suid_dumpable,
1418 .maxlen = sizeof(int),
1419 .mode = 0644,
1420 .proc_handler = &proc_dointvec,
1421 },
2abc26fc
EB		 1422#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1423 {
1424 .ctl_name = CTL_UNNUMBERED,
1425 .procname = "binfmt_misc",
1426 .mode = 0555,
1427 .child = binfmt_misc_table,
1428 },
1429#endif
2be7fe07
AM		 1430/*
1431 * NOTE: do not add new entries to this table unless you have read
1432 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1433 */
1da177e4
LT		 1434 { .ctl_name = 0 }
1435};
1436
d8217f07 1437static struct ctl_table debug_table[] = {
d0c3d534 1438#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1439 {
1440 .ctl_name = CTL_UNNUMBERED,
1441 .procname = "exception-trace",
1442 .data = &show_unhandled_signals,
1443 .maxlen = sizeof(int),
1444 .mode = 0644,
1445 .proc_handler = proc_dointvec
1446 },
1447#endif
1da177e4
LT		 1448 { .ctl_name = 0 }
1449};
1450
d8217f07 1451static struct ctl_table dev_table[] = {
1da177e4 1452 { .ctl_name = 0 }
0eeca283 1453};
1da177e4 1454
330d57fb
AV		 1455static DEFINE_SPINLOCK(sysctl_lock);
1456
1457/* called under sysctl_lock */
1458static int use_table(struct ctl_table_header *p)
1459{
1460 if (unlikely(p->unregistering))
1461 return 0;
1462 p->used++;
1463 return 1;
1464}
1465
1466/* called under sysctl_lock */
1467static void unuse_table(struct ctl_table_header *p)
1468{
1469 if (!--p->used)
1470 if (unlikely(p->unregistering))
1471 complete(p->unregistering);
1472}
1473
1474/* called under sysctl_lock, will reacquire if has to wait */
1475static void start_unregistering(struct ctl_table_header *p)
1476{
1477 /*
1478 * if p->used is 0, nobody will ever touch that entry again;
1479 * we'll eliminate all paths to it before dropping sysctl_lock
1480 */
1481 if (unlikely(p->used)) {
1482 struct completion wait;
1483 init_completion(&wait);
1484 p->unregistering = &wait;
1485 spin_unlock(&sysctl_lock);
1486 wait_for_completion(&wait);
1487 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1488 } else {
1489 /* anything non-NULL; we'll never dereference it */
1490 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1491 }
1492 /*
1493 * do not remove from the list until nobody holds it; walking the
1494 * list in do_sysctl() relies on that.
1495 */
1496 list_del_init(&p->ctl_entry);
1497}
1498
f7e6ced4
AV		 1499void sysctl_head_get(struct ctl_table_header *head)
1500{
1501 spin_lock(&sysctl_lock);
1502 head->count++;
1503 spin_unlock(&sysctl_lock);
1504}
1505
1506void sysctl_head_put(struct ctl_table_header *head)
1507{
1508 spin_lock(&sysctl_lock);
1509 if (!--head->count)
1510 kfree(head);
1511 spin_unlock(&sysctl_lock);
1512}
1513
1514struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1515{
1516 if (!head)
1517 BUG();
1518 spin_lock(&sysctl_lock);
1519 if (!use_table(head))
1520 head = ERR_PTR(-ENOENT);
1521 spin_unlock(&sysctl_lock);
1522 return head;
1523}
1524
805b5d5e
EB		 1525void sysctl_head_finish(struct ctl_table_header *head)
1526{
1527 if (!head)
1528 return;
1529 spin_lock(&sysctl_lock);
1530 unuse_table(head);
1531 spin_unlock(&sysctl_lock);
1532}
1533
73455092
AV		 1534static struct ctl_table_set *
1535lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1536{
1537 struct ctl_table_set *set = &root->default_set;
1538 if (root->lookup)
1539 set = root->lookup(root, namespaces);
1540 return set;
1541}
1542
e51b6ba0
EB		 1543static struct list_head *
1544lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1545{
73455092
AV		 1546 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1547 return &set->list;
e51b6ba0
EB		 1548}
1549
1550struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1551 struct ctl_table_header *prev)
1552{
1553 struct ctl_table_root *root;
1554 struct list_head *header_list;
805b5d5e
EB		 1555 struct ctl_table_header *head;
1556 struct list_head *tmp;
e51b6ba0 1557
805b5d5e
EB		 1558 spin_lock(&sysctl_lock);
1559 if (prev) {
e51b6ba0 1560 head = prev;
805b5d5e
EB		 1561 tmp = &prev->ctl_entry;
1562 unuse_table(prev);
1563 goto next;
1564 }
1565 tmp = &root_table_header.ctl_entry;
1566 for (;;) {
1567 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1568
1569 if (!use_table(head))
1570 goto next;
1571 spin_unlock(&sysctl_lock);
1572 return head;
1573 next:
e51b6ba0 1574 root = head->root;
805b5d5e 1575 tmp = tmp->next;
e51b6ba0
EB		 1576 header_list = lookup_header_list(root, namespaces);
1577 if (tmp != header_list)
1578 continue;
1579
1580 do {
1581 root = list_entry(root->root_list.next,
1582 struct ctl_table_root, root_list);
1583 if (root == &sysctl_table_root)
1584 goto out;
1585 header_list = lookup_header_list(root, namespaces);
1586 } while (list_empty(header_list));
1587 tmp = header_list->next;
805b5d5e 1588 }
e51b6ba0 1589out:
805b5d5e
EB		 1590 spin_unlock(&sysctl_lock);
1591 return NULL;
1592}
1593
e51b6ba0
EB		 1594struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1595{
1596 return __sysctl_head_next(current->nsproxy, prev);
1597}
1598
1599void register_sysctl_root(struct ctl_table_root *root)
1600{
1601 spin_lock(&sysctl_lock);
1602 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1603 spin_unlock(&sysctl_lock);
1604}
1605
b89a8171 1606#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1607/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1608static int do_sysctl_strategy(struct ctl_table_root *root,
1609 struct ctl_table *table,
2c4c7155
PE		 1610 void __user *oldval, size_t __user *oldlenp,
1611 void __user *newval, size_t newlen)
1612{
1613 int op = 0, rc;
1614
1615 if (oldval)
e6305c43 1616 op |= MAY_READ;
2c4c7155 1617 if (newval)
e6305c43 1618 op |= MAY_WRITE;
d7321cd6 1619 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1620 return -EPERM;
1621
1622 if (table->strategy) {
f221e726 1623 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1624 if (rc < 0)
1625 return rc;
1626 if (rc > 0)
1627 return 0;
1628 }
1629
1630 /* If there is no strategy routine, or if the strategy returns
1631 * zero, proceed with automatic r/w */
1632 if (table->data && table->maxlen) {
f221e726 1633 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1634 if (rc < 0)
1635 return rc;
1636 }
1637 return 0;
1638}
1639
1640static int parse_table(int __user *name, int nlen,
1641 void __user *oldval, size_t __user *oldlenp,
1642 void __user *newval, size_t newlen,
d7321cd6 1643 struct ctl_table_root *root,
2c4c7155
PE		 1644 struct ctl_table *table)
1645{
1646 int n;
1647repeat:
1648 if (!nlen)
1649 return -ENOTDIR;
1650 if (get_user(n, name))
1651 return -EFAULT;
1652 for ( ; table->ctl_name || table->procname; table++) {
1653 if (!table->ctl_name)
1654 continue;
1655 if (n == table->ctl_name) {
1656 int error;
1657 if (table->child) {
e6305c43 1658 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1659 return -EPERM;
1660 name++;
1661 nlen--;
1662 table = table->child;
1663 goto repeat;
1664 }
f221e726 1665 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1666 oldval, oldlenp,
1667 newval, newlen);
1668 return error;
1669 }
1670 }
1671 return -ENOTDIR;
1672}
1673
1da177e4
LT		 1674int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1675 void __user *newval, size_t newlen)
1676{
805b5d5e 1677 struct ctl_table_header *head;
330d57fb 1678 int error = -ENOTDIR;
1da177e4
LT		 1679
1680 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1681 return -ENOTDIR;
1682 if (oldval) {
1683 int old_len;
1684 if (!oldlenp || get_user(old_len, oldlenp))
1685 return -EFAULT;
1686 }
330d57fb 1687
805b5d5e
EB		 1688 for (head = sysctl_head_next(NULL); head;
1689 head = sysctl_head_next(head)) {
330d57fb 1690 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1691 newval, newlen,
1692 head->root, head->ctl_table);
805b5d5e
EB		 1693 if (error != -ENOTDIR) {
1694 sysctl_head_finish(head);
330d57fb 1695 break;
805b5d5e
EB		 1696 }
1697 }
330d57fb 1698 return error;
1da177e4
LT		 1699}
1700
1e7bfb21 1701SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1702{
1703 struct __sysctl_args tmp;
1704 int error;
1705
1706 if (copy_from_user(&tmp, args, sizeof(tmp)))
1707 return -EFAULT;
1708
7058cb02
EB		 1709 error = deprecated_sysctl_warning(&tmp);
1710 if (error)
1711 goto out;
1712
1da177e4
LT		 1713 lock_kernel();
1714 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1715 tmp.newval, tmp.newlen);
1716 unlock_kernel();
7058cb02 1717out:
1da177e4
LT		 1718 return error;
1719}
b89a8171 1720#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1721
1722/*
1ff007eb 1723 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1724 * some sysctl variables are readonly even to root.
1725 */
1726
1727static int test_perm(int mode, int op)
1728{
76aac0e9 1729 if (!current_euid())
1da177e4
LT		 1730 mode >>= 6;
1731 else if (in_egroup_p(0))
1732 mode >>= 3;
e6305c43 1733 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1734 return 0;
1735 return -EACCES;
1736}
1737
d7321cd6 1738int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1739{
1740 int error;
d7321cd6
PE		 1741 int mode;
1742
e6305c43 1743 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1744 if (error)
1745 return error;
d7321cd6
PE		 1746
1747 if (root->permissions)
1748 mode = root->permissions(root, current->nsproxy, table);
1749 else
1750 mode = table->mode;
1751
1752 return test_perm(mode, op);
1da177e4
LT		 1753}
1754
d912b0cc
EB		 1755static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1756{
1757 for (; table->ctl_name || table->procname; table++) {
1758 table->parent = parent;
1759 if (table->child)
1760 sysctl_set_parent(table, table->child);
1761 }
1762}
1763
1764static __init int sysctl_init(void)
1765{
1766 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1767#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1768 {
1769 int err;
1770 err = sysctl_check_table(current->nsproxy, root_table);
1771 }
1772#endif
d912b0cc
EB		 1773 return 0;
1774}
1775
1776core_initcall(sysctl_init);
1777
bfbcf034
AV		 1778static struct ctl_table *is_branch_in(struct ctl_table *branch,
1779 struct ctl_table *table)
ae7edecc
AV		 1780{
1781 struct ctl_table *p;
1782 const char *s = branch->procname;
1783
1784 /* branch should have named subdirectory as its first element */
1785 if (!s || !branch->child)
bfbcf034 1786 return NULL;
ae7edecc
AV		 1787
1788 /* ... and nothing else */
1789 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1790 return NULL;
ae7edecc
AV		 1791
1792 /* table should contain subdirectory with the same name */
1793 for (p = table; p->procname || p->ctl_name; p++) {
1794 if (!p->child)
1795 continue;
1796 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1797 return p;
ae7edecc 1798 }
bfbcf034 1799 return NULL;
ae7edecc
AV		 1800}
1801
1802/* see if attaching q to p would be an improvement */
1803static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1804{
1805 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1806 struct ctl_table *next;
ae7edecc
AV		 1807 int is_better = 0;
1808 int not_in_parent = !p->attached_by;
1809
bfbcf034 1810 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1811 if (by == q->attached_by)
1812 is_better = 1;
1813 if (to == p->attached_by)
1814 not_in_parent = 1;
1815 by = by->child;
bfbcf034 1816 to = next->child;
ae7edecc
AV		 1817 }
1818
1819 if (is_better && not_in_parent) {
1820 q->attached_by = by;
1821 q->attached_to = to;
1822 q->parent = p;
1823 }
1824}
1825
1da177e4 1826/**
e51b6ba0
EB		 1827 * __register_sysctl_paths - register a sysctl hierarchy
1828 * @root: List of sysctl headers to register on
1829 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1830 * @path: The path to the directory the sysctl table is in.
1da177e4 1831 * @table: the top-level table structure
1da177e4
LT		 1832 *
1833 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1834 * array. A completely 0 filled entry terminates the table.
1da177e4 1835 *
d8217f07 1836 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1837 *
1838 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1839 * must be unique within that level of sysctl
1840 *
1841 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1842 * enter a sysctl file
1843 *
1844 * data - a pointer to data for use by proc_handler
1845 *
1846 * maxlen - the maximum size in bytes of the data
1847 *
1848 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1849 *
1850 * child - a pointer to the child sysctl table if this entry is a directory, or
1851 * %NULL.
1852 *
1853 * proc_handler - the text handler routine (described below)
1854 *
1855 * strategy - the strategy routine (described below)
1856 *
1857 * de - for internal use by the sysctl routines
1858 *
1859 * extra1, extra2 - extra pointers usable by the proc handler routines
1860 *
1861 * Leaf nodes in the sysctl tree will be represented by a single file
1862 * under /proc; non-leaf nodes will be represented by directories.
1863 *
1864 * sysctl(2) can automatically manage read and write requests through
1865 * the sysctl table. The data and maxlen fields of the ctl_table
1866 * struct enable minimal validation of the values being written to be
1867 * performed, and the mode field allows minimal authentication.
1868 *
1869 * More sophisticated management can be enabled by the provision of a
1870 * strategy routine with the table entry. This will be called before
1871 * any automatic read or write of the data is performed.
1872 *
1873 * The strategy routine may return
1874 *
1875 * < 0 - Error occurred (error is passed to user process)
1876 *
1877 * 0 - OK - proceed with automatic read or write.
1878 *
1879 * > 0 - OK - read or write has been done by the strategy routine, so
1880 * return immediately.
1881 *
1882 * There must be a proc_handler routine for any terminal nodes
1883 * mirrored under /proc/sys (non-terminals are handled by a built-in
1884 * directory handler). Several default handlers are available to
1885 * cover common cases -
1886 *
1887 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1888 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1889 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1890 *
1891 * It is the handler's job to read the input buffer from user memory
1892 * and process it. The handler should return 0 on success.
1893 *
1894 * This routine returns %NULL on a failure to register, and a pointer
1895 * to the table header on success.
1896 */
e51b6ba0
EB		 1897struct ctl_table_header *__register_sysctl_paths(
1898 struct ctl_table_root *root,
1899 struct nsproxy *namespaces,
1900 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1901{
29e796fd
EB		 1902 struct ctl_table_header *header;
1903 struct ctl_table *new, **prevp;
1904 unsigned int n, npath;
ae7edecc 1905 struct ctl_table_set *set;
29e796fd
EB		 1906
1907 /* Count the path components */
1908 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1909 ;
1910
1911 /*
1912 * For each path component, allocate a 2-element ctl_table array.
1913 * The first array element will be filled with the sysctl entry
1914 * for this, the second will be the sentinel (ctl_name == 0).
1915 *
1916 * We allocate everything in one go so that we don't have to
1917 * worry about freeing additional memory in unregister_sysctl_table.
1918 */
1919 header = kzalloc(sizeof(struct ctl_table_header) +
1920 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1921 if (!header)
1da177e4 1922 return NULL;
29e796fd
EB		 1923
1924 new = (struct ctl_table *) (header + 1);
1925
1926 /* Now connect the dots */
1927 prevp = &header->ctl_table;
1928 for (n = 0; n < npath; ++n, ++path) {
1929 /* Copy the procname */
1930 new->procname = path->procname;
1931 new->ctl_name = path->ctl_name;
1932 new->mode = 0555;
1933
1934 *prevp = new;
1935 prevp = &new->child;
1936
1937 new += 2;
1938 }
1939 *prevp = table;
23eb06de 1940 header->ctl_table_arg = table;
29e796fd
EB		 1941
1942 INIT_LIST_HEAD(&header->ctl_entry);
1943 header->used = 0;
1944 header->unregistering = NULL;
e51b6ba0 1945 header->root = root;
29e796fd 1946 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1947 header->count = 1;
88f458e4 1948#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1949 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1950 kfree(header);
fc6cd25b
EB		 1951 return NULL;
1952 }
88f458e4 1953#endif
330d57fb 1954 spin_lock(&sysctl_lock);
73455092 1955 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 1956 header->attached_by = header->ctl_table;
1957 header->attached_to = root_table;
1958 header->parent = &root_table_header;
1959 for (set = header->set; set; set = set->parent) {
1960 struct ctl_table_header *p;
1961 list_for_each_entry(p, &set->list, ctl_entry) {
1962 if (p->unregistering)
1963 continue;
1964 try_attach(p, header);
1965 }
1966 }
1967 header->parent->count++;
73455092 1968 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 1969 spin_unlock(&sysctl_lock);
29e796fd
EB		 1970
1971 return header;
1972}
1973
e51b6ba0
EB		 1974/**
1975 * register_sysctl_table_path - register a sysctl table hierarchy
1976 * @path: The path to the directory the sysctl table is in.
1977 * @table: the top-level table structure
1978 *
1979 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1980 * array. A completely 0 filled entry terminates the table.
1981 *
1982 * See __register_sysctl_paths for more details.
1983 */
1984struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1985 struct ctl_table *table)
1986{
1987 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1988 path, table);
1989}
1990
29e796fd
EB		 1991/**
1992 * register_sysctl_table - register a sysctl table hierarchy
1993 * @table: the top-level table structure
1994 *
1995 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1996 * array. A completely 0 filled entry terminates the table.
1997 *
1998 * See register_sysctl_paths for more details.
1999 */
2000struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2001{
2002 static const struct ctl_path null_path[] = { {} };
2003
2004 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2005}
2006
2007/**
2008 * unregister_sysctl_table - unregister a sysctl table hierarchy
2009 * @header: the header returned from register_sysctl_table
2010 *
2011 * Unregisters the sysctl table and all children. proc entries may not
2012 * actually be removed until they are no longer used by anyone.
2013 */
2014void unregister_sysctl_table(struct ctl_table_header * header)
2015{
330d57fb 2016 might_sleep();
f1dad166
PE		 2017
2018 if (header == NULL)
2019 return;
2020
330d57fb
AV		 2021 spin_lock(&sysctl_lock);
2022 start_unregistering(header);
ae7edecc
AV		 2023 if (!--header->parent->count) {
2024 WARN_ON(1);
2025 kfree(header->parent);
2026 }
f7e6ced4
AV		 2027 if (!--header->count)
2028 kfree(header);
330d57fb 2029 spin_unlock(&sysctl_lock);
1da177e4
LT		 2030}
2031
9043476f
AV		 2032int sysctl_is_seen(struct ctl_table_header *p)
2033{
2034 struct ctl_table_set *set = p->set;
2035 int res;
2036 spin_lock(&sysctl_lock);
2037 if (p->unregistering)
2038 res = 0;
2039 else if (!set->is_seen)
2040 res = 1;
2041 else
2042 res = set->is_seen(set);
2043 spin_unlock(&sysctl_lock);
2044 return res;
2045}
2046
73455092
AV		 2047void setup_sysctl_set(struct ctl_table_set *p,
2048 struct ctl_table_set *parent,
2049 int (*is_seen)(struct ctl_table_set *))
2050{
2051 INIT_LIST_HEAD(&p->list);
2052 p->parent = parent ? parent : &sysctl_table_root.default_set;
2053 p->is_seen = is_seen;
2054}
2055
b89a8171 2056#else /* !CONFIG_SYSCTL */
d8217f07 2057struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2058{
2059 return NULL;
2060}
2061
29e796fd
EB		 2062struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2063 struct ctl_table *table)
2064{
2065 return NULL;
2066}
2067
b89a8171
EB		 2068void unregister_sysctl_table(struct ctl_table_header * table)
2069{
2070}
2071
73455092
AV		 2072void setup_sysctl_set(struct ctl_table_set *p,
2073 struct ctl_table_set *parent,
2074 int (*is_seen)(struct ctl_table_set *))
2075{
2076}
2077
f7e6ced4
AV		 2078void sysctl_head_put(struct ctl_table_header *head)
2079{
2080}
2081
b89a8171
EB		 2082#endif /* CONFIG_SYSCTL */
2083
1da177e4
LT		 2084/*
2085 * /proc/sys support
2086 */
2087
b89a8171 2088#ifdef CONFIG_PROC_SYSCTL
1da177e4 2089
b1ba4ddd
AB		 2090static int _proc_do_string(void* data, int maxlen, int write,
2091 struct file *filp, void __user *buffer,
2092 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2093{
2094 size_t len;
2095 char __user *p;
2096 char c;
8d060877
ON		 2097
2098 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2099 *lenp = 0;
2100 return 0;
2101 }
8d060877 2102
1da177e4
LT		 2103 if (write) {
2104 len = 0;
2105 p = buffer;
2106 while (len < *lenp) {
2107 if (get_user(c, p++))
2108 return -EFAULT;
2109 if (c == 0 || c == '\n')
2110 break;
2111 len++;
2112 }
f5dd3d6f
SV		 2113 if (len >= maxlen)
2114 len = maxlen-1;
2115 if(copy_from_user(data, buffer, len))
1da177e4 2116 return -EFAULT;
f5dd3d6f 2117 ((char *) data)[len] = 0;
1da177e4
LT		 2118 *ppos += *lenp;
2119 } else {
f5dd3d6f
SV		 2120 len = strlen(data);
2121 if (len > maxlen)
2122 len = maxlen;
8d060877
ON		 2123
2124 if (*ppos > len) {
2125 *lenp = 0;
2126 return 0;
2127 }
2128
2129 data += *ppos;
2130 len -= *ppos;
2131
1da177e4
LT		 2132 if (len > *lenp)
2133 len = *lenp;
2134 if (len)
f5dd3d6f 2135 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2136 return -EFAULT;
2137 if (len < *lenp) {
2138 if(put_user('\n', ((char __user *) buffer) + len))
2139 return -EFAULT;
2140 len++;
2141 }
2142 *lenp = len;
2143 *ppos += len;
2144 }
2145 return 0;
2146}
2147
f5dd3d6f
SV		 2148/**
2149 * proc_dostring - read a string sysctl
2150 * @table: the sysctl table
2151 * @write: %TRUE if this is a write to the sysctl file
2152 * @filp: the file structure
2153 * @buffer: the user buffer
2154 * @lenp: the size of the user buffer
2155 * @ppos: file position
2156 *
2157 * Reads/writes a string from/to the user buffer. If the kernel
2158 * buffer provided is not large enough to hold the string, the
2159 * string is truncated. The copied string is %NULL-terminated.
2160 * If the string is being read by the user process, it is copied
2161 * and a newline '\n' is added. It is truncated if the buffer is
2162 * not large enough.
2163 *
2164 * Returns 0 on success.
2165 */
d8217f07 2166int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2167 void __user *buffer, size_t *lenp, loff_t *ppos)
2168{
2169 return _proc_do_string(table->data, table->maxlen, write, filp,
2170 buffer, lenp, ppos);
2171}
2172
1da177e4
LT		 2173
2174static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2175 int *valp,
2176 int write, void *data)
2177{
2178 if (write) {
2179 *valp = *negp ? -*lvalp : *lvalp;
2180 } else {
2181 int val = *valp;
2182 if (val < 0) {
2183 *negp = -1;
2184 *lvalp = (unsigned long)-val;
2185 } else {
2186 *negp = 0;
2187 *lvalp = (unsigned long)val;
2188 }
2189 }
2190 return 0;
2191}
2192
d8217f07 2193static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2194 int write, struct file *filp, void __user *buffer,
2195 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2196 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2197 int write, void *data),
2198 void *data)
2199{
2200#define TMPBUFLEN 21
2201 int *i, vleft, first=1, neg, val;
2202 unsigned long lval;
2203 size_t left, len;
2204
2205 char buf[TMPBUFLEN], *p;
2206 char __user *s = buffer;
2207
fcfbd547 2208 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2209 (*ppos && !write)) {
2210 *lenp = 0;
2211 return 0;
2212 }
2213
fcfbd547 2214 i = (int *) tbl_data;
1da177e4
LT		 2215 vleft = table->maxlen / sizeof(*i);
2216 left = *lenp;
2217
2218 if (!conv)
2219 conv = do_proc_dointvec_conv;
2220
2221 for (; left && vleft--; i++, first=0) {
2222 if (write) {
2223 while (left) {
2224 char c;
2225 if (get_user(c, s))
2226 return -EFAULT;
2227 if (!isspace(c))
2228 break;
2229 left--;
2230 s++;
2231 }
2232 if (!left)
2233 break;
2234 neg = 0;
2235 len = left;
2236 if (len > sizeof(buf) - 1)
2237 len = sizeof(buf) - 1;
2238 if (copy_from_user(buf, s, len))
2239 return -EFAULT;
2240 buf[len] = 0;
2241 p = buf;
2242 if (*p == '-' && left > 1) {
2243 neg = 1;
bd9b0bac 2244 p++;
1da177e4
LT		 2245 }
2246 if (*p < '0' || *p > '9')
2247 break;
2248
2249 lval = simple_strtoul(p, &p, 0);
2250
2251 len = p-buf;
2252 if ((len < left) && *p && !isspace(*p))
2253 break;
2254 if (neg)
2255 val = -val;
2256 s += len;
2257 left -= len;
2258
2259 if (conv(&neg, &lval, i, 1, data))
2260 break;
2261 } else {
2262 p = buf;
2263 if (!first)
2264 *p++ = '\t';
2265
2266 if (conv(&neg, &lval, i, 0, data))
2267 break;
2268
2269 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2270 len = strlen(buf);
2271 if (len > left)
2272 len = left;
2273 if(copy_to_user(s, buf, len))
2274 return -EFAULT;
2275 left -= len;
2276 s += len;
2277 }
2278 }
2279
2280 if (!write && !first && left) {
2281 if(put_user('\n', s))
2282 return -EFAULT;
2283 left--, s++;
2284 }
2285 if (write) {
2286 while (left) {
2287 char c;
2288 if (get_user(c, s++))
2289 return -EFAULT;
2290 if (!isspace(c))
2291 break;
2292 left--;
2293 }
2294 }
2295 if (write && first)
2296 return -EINVAL;
2297 *lenp -= left;
2298 *ppos += *lenp;
2299 return 0;
2300#undef TMPBUFLEN
2301}
2302
d8217f07 2303static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2304 void __user *buffer, size_t *lenp, loff_t *ppos,
2305 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2306 int write, void *data),
2307 void *data)
2308{
2309 return __do_proc_dointvec(table->data, table, write, filp,
2310 buffer, lenp, ppos, conv, data);
2311}
2312
1da177e4
LT		 2313/**
2314 * proc_dointvec - read a vector of integers
2315 * @table: the sysctl table
2316 * @write: %TRUE if this is a write to the sysctl file
2317 * @filp: the file structure
2318 * @buffer: the user buffer
2319 * @lenp: the size of the user buffer
2320 * @ppos: file position
2321 *
2322 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2323 * values from/to the user buffer, treated as an ASCII string.
2324 *
2325 * Returns 0 on success.
2326 */
d8217f07 2327int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2328 void __user *buffer, size_t *lenp, loff_t *ppos)
2329{
2330 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2331 NULL,NULL);
2332}
2333
34f5a398 2334/*
25ddbb18
AK		 2335 * Taint values can only be increased
2336 * This means we can safely use a temporary.
34f5a398 2337 */
25ddbb18 2338static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2339 void __user *buffer, size_t *lenp, loff_t *ppos)
2340{
25ddbb18
AK		 2341 struct ctl_table t;
2342 unsigned long tmptaint = get_taint();
2343 int err;
34f5a398 2344
91fcd412 2345 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2346 return -EPERM;
2347
25ddbb18
AK		 2348 t = *table;
2349 t.data = &tmptaint;
2350 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2351 if (err < 0)
2352 return err;
2353
2354 if (write) {
2355 /*
2356 * Poor man's atomic or. Not worth adding a primitive
2357 * to everyone's atomic.h for this
2358 */
2359 int i;
2360 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2361 if ((tmptaint >> i) & 1)
2362 add_taint(i);
2363 }
2364 }
2365
2366 return err;
34f5a398
TT		 2367}
2368
1da177e4
LT		 2369struct do_proc_dointvec_minmax_conv_param {
2370 int *min;
2371 int *max;
2372};
2373
2374static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2375 int *valp,
2376 int write, void *data)
2377{
2378 struct do_proc_dointvec_minmax_conv_param *param = data;
2379 if (write) {
2380 int val = *negp ? -*lvalp : *lvalp;
2381 if ((param->min && *param->min > val) ||
2382 (param->max && *param->max < val))
2383 return -EINVAL;
2384 *valp = val;
2385 } else {
2386 int val = *valp;
2387 if (val < 0) {
2388 *negp = -1;
2389 *lvalp = (unsigned long)-val;
2390 } else {
2391 *negp = 0;
2392 *lvalp = (unsigned long)val;
2393 }
2394 }
2395 return 0;
2396}
2397
2398/**
2399 * proc_dointvec_minmax - read a vector of integers with min/max values
2400 * @table: the sysctl table
2401 * @write: %TRUE if this is a write to the sysctl file
2402 * @filp: the file structure
2403 * @buffer: the user buffer
2404 * @lenp: the size of the user buffer
2405 * @ppos: file position
2406 *
2407 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2408 * values from/to the user buffer, treated as an ASCII string.
2409 *
2410 * This routine will ensure the values are within the range specified by
2411 * table->extra1 (min) and table->extra2 (max).
2412 *
2413 * Returns 0 on success.
2414 */
d8217f07 2415int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2416 void __user *buffer, size_t *lenp, loff_t *ppos)
2417{
2418 struct do_proc_dointvec_minmax_conv_param param = {
2419 .min = (int *) table->extra1,
2420 .max = (int *) table->extra2,
2421 };
2422 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2423 do_proc_dointvec_minmax_conv, &param);
2424}
2425
d8217f07 2426static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2427 struct file *filp,
2428 void __user *buffer,
2429 size_t *lenp, loff_t *ppos,
2430 unsigned long convmul,
2431 unsigned long convdiv)
2432{
2433#define TMPBUFLEN 21
2434 unsigned long *i, *min, *max, val;
2435 int vleft, first=1, neg;
2436 size_t len, left;
2437 char buf[TMPBUFLEN], *p;
2438 char __user *s = buffer;
2439
fcfbd547 2440 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2441 (*ppos && !write)) {
2442 *lenp = 0;
2443 return 0;
2444 }
2445
fcfbd547 2446 i = (unsigned long *) data;
1da177e4
LT		 2447 min = (unsigned long *) table->extra1;
2448 max = (unsigned long *) table->extra2;
2449 vleft = table->maxlen / sizeof(unsigned long);
2450 left = *lenp;
2451
2452 for (; left && vleft--; i++, min++, max++, first=0) {
2453 if (write) {
2454 while (left) {
2455 char c;
2456 if (get_user(c, s))
2457 return -EFAULT;
2458 if (!isspace(c))
2459 break;
2460 left--;
2461 s++;
2462 }
2463 if (!left)
2464 break;
2465 neg = 0;
2466 len = left;
2467 if (len > TMPBUFLEN-1)
2468 len = TMPBUFLEN-1;
2469 if (copy_from_user(buf, s, len))
2470 return -EFAULT;
2471 buf[len] = 0;
2472 p = buf;
2473 if (*p == '-' && left > 1) {
2474 neg = 1;
bd9b0bac 2475 p++;
1da177e4
LT		 2476 }
2477 if (*p < '0' || *p > '9')
2478 break;
2479 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2480 len = p-buf;
2481 if ((len < left) && *p && !isspace(*p))
2482 break;
2483 if (neg)
2484 val = -val;
2485 s += len;
2486 left -= len;
2487
2488 if(neg)
2489 continue;
2490 if ((min && val < *min) || (max && val > *max))
2491 continue;
2492 *i = val;
2493 } else {
2494 p = buf;
2495 if (!first)
2496 *p++ = '\t';
2497 sprintf(p, "%lu", convdiv * (*i) / convmul);
2498 len = strlen(buf);
2499 if (len > left)
2500 len = left;
2501 if(copy_to_user(s, buf, len))
2502 return -EFAULT;
2503 left -= len;
2504 s += len;
2505 }
2506 }
2507
2508 if (!write && !first && left) {
2509 if(put_user('\n', s))
2510 return -EFAULT;
2511 left--, s++;
2512 }
2513 if (write) {
2514 while (left) {
2515 char c;
2516 if (get_user(c, s++))
2517 return -EFAULT;
2518 if (!isspace(c))
2519 break;
2520 left--;
2521 }
2522 }
2523 if (write && first)
2524 return -EINVAL;
2525 *lenp -= left;
2526 *ppos += *lenp;
2527 return 0;
2528#undef TMPBUFLEN
2529}
2530
d8217f07 2531static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2532 struct file *filp,
2533 void __user *buffer,
2534 size_t *lenp, loff_t *ppos,
2535 unsigned long convmul,
2536 unsigned long convdiv)
2537{
2538 return __do_proc_doulongvec_minmax(table->data, table, write,
2539 filp, buffer, lenp, ppos, convmul, convdiv);
2540}
2541
1da177e4
LT		 2542/**
2543 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2544 * @table: the sysctl table
2545 * @write: %TRUE if this is a write to the sysctl file
2546 * @filp: the file structure
2547 * @buffer: the user buffer
2548 * @lenp: the size of the user buffer
2549 * @ppos: file position
2550 *
2551 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2552 * values from/to the user buffer, treated as an ASCII string.
2553 *
2554 * This routine will ensure the values are within the range specified by
2555 * table->extra1 (min) and table->extra2 (max).
2556 *
2557 * Returns 0 on success.
2558 */
d8217f07 2559int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2560 void __user *buffer, size_t *lenp, loff_t *ppos)
2561{
2562 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2563}
2564
2565/**
2566 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2567 * @table: the sysctl table
2568 * @write: %TRUE if this is a write to the sysctl file
2569 * @filp: the file structure
2570 * @buffer: the user buffer
2571 * @lenp: the size of the user buffer
2572 * @ppos: file position
2573 *
2574 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2575 * values from/to the user buffer, treated as an ASCII string. The values
2576 * are treated as milliseconds, and converted to jiffies when they are stored.
2577 *
2578 * This routine will ensure the values are within the range specified by
2579 * table->extra1 (min) and table->extra2 (max).
2580 *
2581 * Returns 0 on success.
2582 */
d8217f07 2583int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2584 struct file *filp,
2585 void __user *buffer,
2586 size_t *lenp, loff_t *ppos)
2587{
2588 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2589 lenp, ppos, HZ, 1000l);
2590}
2591
2592
2593static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2594 int *valp,
2595 int write, void *data)
2596{
2597 if (write) {
cba9f33d
BS		 2598 if (*lvalp > LONG_MAX / HZ)
2599 return 1;
1da177e4
LT		 2600 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2601 } else {
2602 int val = *valp;
2603 unsigned long lval;
2604 if (val < 0) {
2605 *negp = -1;
2606 lval = (unsigned long)-val;
2607 } else {
2608 *negp = 0;
2609 lval = (unsigned long)val;
2610 }
2611 *lvalp = lval / HZ;
2612 }
2613 return 0;
2614}
2615
2616static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2617 int *valp,
2618 int write, void *data)
2619{
2620 if (write) {
cba9f33d
BS		 2621 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2622 return 1;
1da177e4
LT		 2623 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2624 } else {
2625 int val = *valp;
2626 unsigned long lval;
2627 if (val < 0) {
2628 *negp = -1;
2629 lval = (unsigned long)-val;
2630 } else {
2631 *negp = 0;
2632 lval = (unsigned long)val;
2633 }
2634 *lvalp = jiffies_to_clock_t(lval);
2635 }
2636 return 0;
2637}
2638
2639static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2640 int *valp,
2641 int write, void *data)
2642{
2643 if (write) {
2644 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2645 } else {
2646 int val = *valp;
2647 unsigned long lval;
2648 if (val < 0) {
2649 *negp = -1;
2650 lval = (unsigned long)-val;
2651 } else {
2652 *negp = 0;
2653 lval = (unsigned long)val;
2654 }
2655 *lvalp = jiffies_to_msecs(lval);
2656 }
2657 return 0;
2658}
2659
2660/**
2661 * proc_dointvec_jiffies - read a vector of integers as seconds
2662 * @table: the sysctl table
2663 * @write: %TRUE if this is a write to the sysctl file
2664 * @filp: the file structure
2665 * @buffer: the user buffer
2666 * @lenp: the size of the user buffer
2667 * @ppos: file position
2668 *
2669 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2670 * values from/to the user buffer, treated as an ASCII string.
2671 * The values read are assumed to be in seconds, and are converted into
2672 * jiffies.
2673 *
2674 * Returns 0 on success.
2675 */
d8217f07 2676int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2677 void __user *buffer, size_t *lenp, loff_t *ppos)
2678{
2679 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2680 do_proc_dointvec_jiffies_conv,NULL);
2681}
2682
2683/**
2684 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2685 * @table: the sysctl table
2686 * @write: %TRUE if this is a write to the sysctl file
2687 * @filp: the file structure
2688 * @buffer: the user buffer
2689 * @lenp: the size of the user buffer
1e5d5331 2690 * @ppos: pointer to the file position
1da177e4
LT		 2691 *
2692 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2693 * values from/to the user buffer, treated as an ASCII string.
2694 * The values read are assumed to be in 1/USER_HZ seconds, and
2695 * are converted into jiffies.
2696 *
2697 * Returns 0 on success.
2698 */
d8217f07 2699int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701{
2702 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2703 do_proc_dointvec_userhz_jiffies_conv,NULL);
2704}
2705
2706/**
2707 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2708 * @table: the sysctl table
2709 * @write: %TRUE if this is a write to the sysctl file
2710 * @filp: the file structure
2711 * @buffer: the user buffer
2712 * @lenp: the size of the user buffer
67be2dd1
MW		 2713 * @ppos: file position
2714 * @ppos: the current position in the file
1da177e4
LT		 2715 *
2716 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2717 * values from/to the user buffer, treated as an ASCII string.
2718 * The values read are assumed to be in 1/1000 seconds, and
2719 * are converted into jiffies.
2720 *
2721 * Returns 0 on success.
2722 */
d8217f07 2723int proc_dointvec_ms_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 do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2727 do_proc_dointvec_ms_jiffies_conv, NULL);
2728}
2729
d8217f07 2730static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2731 void __user *buffer, size_t *lenp, loff_t *ppos)
2732{
2733 struct pid *new_pid;
2734 pid_t tmp;
2735 int r;
2736
6c5f3e7b 2737 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2738
2739 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2740 lenp, ppos, NULL, NULL);
2741 if (r || !write)
2742 return r;
2743
2744 new_pid = find_get_pid(tmp);
2745 if (!new_pid)
2746 return -ESRCH;
2747
2748 put_pid(xchg(&cad_pid, new_pid));
2749 return 0;
2750}
2751
1da177e4
LT		 2752#else /* CONFIG_PROC_FS */
2753
d8217f07 2754int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2755 void __user *buffer, size_t *lenp, loff_t *ppos)
2756{
2757 return -ENOSYS;
2758}
2759
d8217f07 2760int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2761 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2762{
2763 return -ENOSYS;
2764}
2765
d8217f07 2766int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2767 void __user *buffer, size_t *lenp, loff_t *ppos)
2768{
2769 return -ENOSYS;
2770}
2771
d8217f07 2772int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2773 void __user *buffer, size_t *lenp, loff_t *ppos)
2774{
2775 return -ENOSYS;
2776}
2777
d8217f07 2778int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2779 void __user *buffer, size_t *lenp, loff_t *ppos)
2780{
2781 return -ENOSYS;
2782}
2783
d8217f07 2784int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2785 void __user *buffer, size_t *lenp, loff_t *ppos)
2786{
2787 return -ENOSYS;
2788}
2789
d8217f07 2790int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2791 void __user *buffer, size_t *lenp, loff_t *ppos)
2792{
2793 return -ENOSYS;
2794}
2795
d8217f07 2796int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2797 struct file *filp,
2798 void __user *buffer,
2799 size_t *lenp, loff_t *ppos)
2800{
2801 return -ENOSYS;
2802}
2803
2804
2805#endif /* CONFIG_PROC_FS */
2806
2807
b89a8171 2808#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2809/*
2810 * General sysctl support routines
2811 */
2812
49a0c458 2813/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2814int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2815 void __user *oldval, size_t __user *oldlenp,
2816 void __user *newval, size_t newlen)
2817{
2818 size_t len;
2819
2820 /* Get out of I don't have a variable */
2821 if (!table->data || !table->maxlen)
2822 return -ENOTDIR;
2823
2824 if (oldval && oldlenp) {
2825 if (get_user(len, oldlenp))
2826 return -EFAULT;
2827 if (len) {
2828 if (len > table->maxlen)
2829 len = table->maxlen;
2830 if (copy_to_user(oldval, table->data, len))
2831 return -EFAULT;
2832 if (put_user(len, oldlenp))
2833 return -EFAULT;
2834 }
2835 }
2836
2837 if (newval && newlen) {
2838 if (newlen > table->maxlen)
2839 newlen = table->maxlen;
2840
2841 if (copy_from_user(table->data, newval, newlen))
2842 return -EFAULT;
2843 }
2844 return 1;
2845}
2846
1da177e4 2847/* The generic string strategy routine: */
f221e726 2848int sysctl_string(struct ctl_table *table,
1da177e4 2849 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2850 void __user *newval, size_t newlen)
1da177e4 2851{
1da177e4
LT		 2852 if (!table->data || !table->maxlen)
2853 return -ENOTDIR;
2854
2855 if (oldval && oldlenp) {
de9e007d
LT		 2856 size_t bufsize;
2857 if (get_user(bufsize, oldlenp))
1da177e4 2858 return -EFAULT;
de9e007d
LT		 2859 if (bufsize) {
2860 size_t len = strlen(table->data), copied;
2861
2862 /* This shouldn't trigger for a well-formed sysctl */
2863 if (len > table->maxlen)
1da177e4 2864 len = table->maxlen;
de9e007d
LT		 2865
2866 /* Copy up to a max of bufsize-1 bytes of the string */
2867 copied = (len >= bufsize) ? bufsize - 1 : len;
2868
2869 if (copy_to_user(oldval, table->data, copied) ||
2870 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2871 return -EFAULT;
de9e007d 2872 if (put_user(len, oldlenp))
1da177e4
LT		 2873 return -EFAULT;
2874 }
2875 }
2876 if (newval && newlen) {
de9e007d 2877 size_t len = newlen;
1da177e4
LT		 2878 if (len > table->maxlen)
2879 len = table->maxlen;
2880 if(copy_from_user(table->data, newval, len))
2881 return -EFAULT;
2882 if (len == table->maxlen)
2883 len--;
2884 ((char *) table->data)[len] = 0;
2885 }
82c9df82 2886 return 1;
1da177e4
LT		 2887}
2888
2889/*
2890 * This function makes sure that all of the integers in the vector
2891 * are between the minimum and maximum values given in the arrays
2892 * table->extra1 and table->extra2, respectively.
2893 */
f221e726 2894int sysctl_intvec(struct ctl_table *table,
1da177e4 2895 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2896 void __user *newval, size_t newlen)
1da177e4
LT		 2897{
2898
2899 if (newval && newlen) {
2900 int __user *vec = (int __user *) newval;
2901 int *min = (int *) table->extra1;
2902 int *max = (int *) table->extra2;
2903 size_t length;
2904 int i;
2905
2906 if (newlen % sizeof(int) != 0)
2907 return -EINVAL;
2908
2909 if (!table->extra1 && !table->extra2)
2910 return 0;
2911
2912 if (newlen > table->maxlen)
2913 newlen = table->maxlen;
2914 length = newlen / sizeof(int);
2915
2916 for (i = 0; i < length; i++) {
2917 int value;
2918 if (get_user(value, vec + i))
2919 return -EFAULT;
2920 if (min && value < min[i])
2921 return -EINVAL;
2922 if (max && value > max[i])
2923 return -EINVAL;
2924 }
2925 }
2926 return 0;
2927}
2928
2929/* Strategy function to convert jiffies to seconds */
f221e726 2930int sysctl_jiffies(struct ctl_table *table,
1da177e4 2931 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2932 void __user *newval, size_t newlen)
1da177e4 2933{
3ee75ac3 2934 if (oldval && oldlenp) {
1da177e4 2935 size_t olen;
3ee75ac3
AD		 2936
2937 if (get_user(olen, oldlenp))
2938 return -EFAULT;
2939 if (olen) {
2940 int val;
2941
2942 if (olen < sizeof(int))
2943 return -EINVAL;
2944
2945 val = *(int *)(table->data) / HZ;
2946 if (put_user(val, (int __user *)oldval))
2947 return -EFAULT;
2948 if (put_user(sizeof(int), oldlenp))
1da177e4 2949 return -EFAULT;
1da177e4 2950 }
1da177e4
LT		 2951 }
2952 if (newval && newlen) {
2953 int new;
2954 if (newlen != sizeof(int))
2955 return -EINVAL;
2956 if (get_user(new, (int __user *)newval))
2957 return -EFAULT;
2958 *(int *)(table->data) = new*HZ;
2959 }
2960 return 1;
2961}
2962
2963/* Strategy function to convert jiffies to seconds */
f221e726 2964int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 2965 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2966 void __user *newval, size_t newlen)
1da177e4 2967{
3ee75ac3 2968 if (oldval && oldlenp) {
1da177e4 2969 size_t olen;
3ee75ac3
AD		 2970
2971 if (get_user(olen, oldlenp))
2972 return -EFAULT;
2973 if (olen) {
2974 int val;
2975
2976 if (olen < sizeof(int))
2977 return -EINVAL;
2978
2979 val = jiffies_to_msecs(*(int *)(table->data));
2980 if (put_user(val, (int __user *)oldval))
2981 return -EFAULT;
2982 if (put_user(sizeof(int), oldlenp))
1da177e4 2983 return -EFAULT;
1da177e4 2984 }
1da177e4
LT		 2985 }
2986 if (newval && newlen) {
2987 int new;
2988 if (newlen != sizeof(int))
2989 return -EINVAL;
2990 if (get_user(new, (int __user *)newval))
2991 return -EFAULT;
2992 *(int *)(table->data) = msecs_to_jiffies(new);
2993 }
2994 return 1;
2995}
2996
c4b8b769 2997
c4b8b769 2998
b89a8171 2999#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3000
3001
1e7bfb21 3002SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3003{
0e009be8 3004 struct __sysctl_args tmp;
7058cb02 3005 int error;
0e009be8 3006
0e009be8
EB		 3007 if (copy_from_user(&tmp, args, sizeof(tmp)))
3008 return -EFAULT;
0e009be8 3009
7058cb02 3010 error = deprecated_sysctl_warning(&tmp);
b89a8171 3011
7058cb02
EB		 3012 /* If no error reading the parameters then just -ENOSYS ... */
3013 if (!error)
3014 error = -ENOSYS;
3015
3016 return error;
1da177e4
LT		 3017}
3018
f221e726 3019int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3020 void __user *oldval, size_t __user *oldlenp,
3021 void __user *newval, size_t newlen)
3022{
3023 return -ENOSYS;
3024}
3025
f221e726 3026int sysctl_string(struct ctl_table *table,
1da177e4 3027 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3028 void __user *newval, size_t newlen)
1da177e4
LT		 3029{
3030 return -ENOSYS;
3031}
3032
f221e726 3033int sysctl_intvec(struct ctl_table *table,
1da177e4 3034 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3035 void __user *newval, size_t newlen)
1da177e4
LT		 3036{
3037 return -ENOSYS;
3038}
3039
f221e726 3040int sysctl_jiffies(struct ctl_table *table,
1da177e4 3041 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3042 void __user *newval, size_t newlen)
1da177e4
LT		 3043{
3044 return -ENOSYS;
3045}
3046
f221e726 3047int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3048 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3049 void __user *newval, size_t newlen)
1da177e4
LT		 3050{
3051 return -ENOSYS;
3052}
3053
b89a8171 3054#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3055
7058cb02
EB		 3056static int deprecated_sysctl_warning(struct __sysctl_args *args)
3057{
3058 static int msg_count;
3059 int name[CTL_MAXNAME];
3060 int i;
3061
6fc48af8
TH		 3062 /* Check args->nlen. */
3063 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3064 return -ENOTDIR;
3065
7058cb02
EB		 3066 /* Read in the sysctl name for better debug message logging */
3067 for (i = 0; i < args->nlen; i++)
3068 if (get_user(name[i], args->name + i))
3069 return -EFAULT;
3070
3071 /* Ignore accesses to kernel.version */
3072 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3073 return 0;
3074
3075 if (msg_count < 5) {
3076 msg_count++;
3077 printk(KERN_INFO
3078 "warning: process `%s' used the deprecated sysctl "
3079 "system call with ", current->comm);
3080 for (i = 0; i < args->nlen; i++)
3081 printk("%d.", name[i]);
3082 printk("\n");
3083 }
3084 return 0;
3085}
3086
1da177e4
LT		 3087/*
3088 * No sense putting this after each symbol definition, twice,
3089 * exception granted :-)
3090 */
3091EXPORT_SYMBOL(proc_dointvec);
3092EXPORT_SYMBOL(proc_dointvec_jiffies);
3093EXPORT_SYMBOL(proc_dointvec_minmax);
3094EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3095EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3096EXPORT_SYMBOL(proc_dostring);
3097EXPORT_SYMBOL(proc_doulongvec_minmax);
3098EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3099EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3100EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3101EXPORT_SYMBOL(sysctl_intvec);
3102EXPORT_SYMBOL(sysctl_jiffies);
3103EXPORT_SYMBOL(sysctl_ms_jiffies);
3104EXPORT_SYMBOL(sysctl_string);
49a0c458 3105EXPORT_SYMBOL(sysctl_data);
1da177e4 3106EXPORT_SYMBOL(unregister_sysctl_table);
kernel source for telekom puls (alcatel/mediatek)