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perf_counter: add ioctl(PERF_COUNTER_IOC_RESET)
[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>
12e22c5e 51#include <linux/slow-work.h>
1ccd1549 52#include <linux/perf_counter.h>
1da177e4
LT		 53
54#include <asm/uaccess.h>
55#include <asm/processor.h>
56
29cbc78b
AK		 57#ifdef CONFIG_X86
58#include <asm/nmi.h>
0741f4d2 59#include <asm/stacktrace.h>
6e7c4025 60#include <asm/io.h>
29cbc78b
AK		 61#endif
62
7058cb02
EB		 63static int deprecated_sysctl_warning(struct __sysctl_args *args);
64
1da177e4
LT		 65#if defined(CONFIG_SYSCTL)
66
67/* External variables not in a header file. */
68extern int C_A_D;
45807a1d 69extern int print_fatal_signals;
1da177e4
LT		 70extern int sysctl_overcommit_memory;
71extern int sysctl_overcommit_ratio;
fadd8fbd 72extern int sysctl_panic_on_oom;
fe071d7e 73extern int sysctl_oom_kill_allocating_task;
fef1bdd6 74extern int sysctl_oom_dump_tasks;
1da177e4 75extern int max_threads;
1da177e4 76extern int core_uses_pid;
d6e71144 77extern int suid_dumpable;
1da177e4 78extern char core_pattern[];
1da177e4
LT		 79extern int pid_max;
80extern int min_free_kbytes;
1da177e4 81extern int pid_max_min, pid_max_max;
9d0243bc 82extern int sysctl_drop_caches;
8ad4b1fb 83extern int percpu_pagelist_fraction;
bebfa101 84extern int compat_log;
9745512c 85extern int latencytop_enabled;
eceea0b3 86extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 87#ifndef CONFIG_MMU
88extern int sysctl_nr_trim_pages;
89#endif
31a72bce
PM		 90#ifdef CONFIG_RCU_TORTURE_TEST
91extern int rcutorture_runnable;
92#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 93
c4f3b63f 94/* Constants used for minimum and maximum */
195cf453 95#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 96static int sixty = 60;
9383d967 97static int neg_one = -1;
c4f3b63f
RT		 98#endif
99
c4f3b63f 100static int zero;
cd5f9a4c
LT		 101static int __maybe_unused one = 1;
102static int __maybe_unused two = 2;
fc3501d4 103static unsigned long one_ul = 1;
c4f3b63f 104static int one_hundred = 100;
fafd688e 105static int one_thousand = 1000;
c4f3b63f 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 },
e162b39a
MSB		 818#endif
819#ifdef CONFIG_DETECT_HUNG_TASK
820 {
821 .ctl_name = CTL_UNNUMBERED,
822 .procname = "hung_task_panic",
823 .data = &sysctl_hung_task_panic,
824 .maxlen = sizeof(int),
825 .mode = 0644,
826 .proc_handler = &proc_dointvec_minmax,
827 .strategy = &sysctl_intvec,
828 .extra1 = &zero,
829 .extra2 = &one,
830 },
82a1fcb9
IM		 831 {
832 .ctl_name = CTL_UNNUMBERED,
833 .procname = "hung_task_check_count",
834 .data = &sysctl_hung_task_check_count,
90739081 835 .maxlen = sizeof(unsigned long),
82a1fcb9 836 .mode = 0644,
90739081 837 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 838 .strategy = &sysctl_intvec,
839 },
840 {
841 .ctl_name = CTL_UNNUMBERED,
842 .procname = "hung_task_timeout_secs",
843 .data = &sysctl_hung_task_timeout_secs,
90739081 844 .maxlen = sizeof(unsigned long),
82a1fcb9 845 .mode = 0644,
e162b39a 846 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 847 .strategy = &sysctl_intvec,
848 },
849 {
850 .ctl_name = CTL_UNNUMBERED,
851 .procname = "hung_task_warnings",
852 .data = &sysctl_hung_task_warnings,
90739081 853 .maxlen = sizeof(unsigned long),
82a1fcb9 854 .mode = 0644,
90739081 855 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 856 .strategy = &sysctl_intvec,
857 },
c4f3b63f 858#endif
bebfa101
AK		 859#ifdef CONFIG_COMPAT
860 {
861 .ctl_name = KERN_COMPAT_LOG,
862 .procname = "compat-log",
863 .data = &compat_log,
864 .maxlen = sizeof (int),
865 .mode = 0644,
866 .proc_handler = &proc_dointvec,
867 },
951f22d5 868#endif
23f78d4a
IM		 869#ifdef CONFIG_RT_MUTEXES
870 {
871 .ctl_name = KERN_MAX_LOCK_DEPTH,
872 .procname = "max_lock_depth",
873 .data = &max_lock_depth,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = &proc_dointvec,
877 },
5096add8 878#endif
10a0a8d4
JF		 879 {
880 .ctl_name = CTL_UNNUMBERED,
881 .procname = "poweroff_cmd",
882 .data = &poweroff_cmd,
883 .maxlen = POWEROFF_CMD_PATH_LEN,
884 .mode = 0644,
885 .proc_handler = &proc_dostring,
886 .strategy = &sysctl_string,
887 },
0b77f5bf
DH		 888#ifdef CONFIG_KEYS
889 {
890 .ctl_name = CTL_UNNUMBERED,
891 .procname = "keys",
892 .mode = 0555,
893 .child = key_sysctls,
894 },
895#endif
31a72bce
PM		 896#ifdef CONFIG_RCU_TORTURE_TEST
897 {
898 .ctl_name = CTL_UNNUMBERED,
899 .procname = "rcutorture_runnable",
900 .data = &rcutorture_runnable,
901 .maxlen = sizeof(int),
902 .mode = 0644,
903 .proc_handler = &proc_dointvec,
904 },
905#endif
12e22c5e
DH		 906#ifdef CONFIG_SLOW_WORK
907 {
908 .ctl_name = CTL_UNNUMBERED,
909 .procname = "slow-work",
910 .mode = 0555,
911 .child = slow_work_sysctls,
912 },
913#endif
1ccd1549
PZ		 914#ifdef CONFIG_PERF_COUNTERS
915 {
916 .ctl_name = CTL_UNNUMBERED,
917 .procname = "perf_counter_privileged",
918 .data = &sysctl_perf_counter_priv,
919 .maxlen = sizeof(sysctl_perf_counter_priv),
920 .mode = 0644,
921 .proc_handler = &proc_dointvec,
922 },
923#endif
ed2c12f3
AM		 924/*
925 * NOTE: do not add new entries to this table unless you have read
926 * Documentation/sysctl/ctl_unnumbered.txt
927 */
1da177e4
LT		 928 { .ctl_name = 0 }
929};
930
d8217f07 931static struct ctl_table vm_table[] = {
1da177e4
LT		 932 {
933 .ctl_name = VM_OVERCOMMIT_MEMORY,
934 .procname = "overcommit_memory",
935 .data = &sysctl_overcommit_memory,
936 .maxlen = sizeof(sysctl_overcommit_memory),
937 .mode = 0644,
938 .proc_handler = &proc_dointvec,
939 },
fadd8fbd
KH		 940 {
941 .ctl_name = VM_PANIC_ON_OOM,
942 .procname = "panic_on_oom",
943 .data = &sysctl_panic_on_oom,
944 .maxlen = sizeof(sysctl_panic_on_oom),
945 .mode = 0644,
946 .proc_handler = &proc_dointvec,
947 },
fe071d7e
DR		 948 {
949 .ctl_name = CTL_UNNUMBERED,
950 .procname = "oom_kill_allocating_task",
951 .data = &sysctl_oom_kill_allocating_task,
952 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
953 .mode = 0644,
954 .proc_handler = &proc_dointvec,
955 },
fef1bdd6
DR		 956 {
957 .ctl_name = CTL_UNNUMBERED,
958 .procname = "oom_dump_tasks",
959 .data = &sysctl_oom_dump_tasks,
960 .maxlen = sizeof(sysctl_oom_dump_tasks),
961 .mode = 0644,
962 .proc_handler = &proc_dointvec,
963 },
1da177e4
LT		 964 {
965 .ctl_name = VM_OVERCOMMIT_RATIO,
966 .procname = "overcommit_ratio",
967 .data = &sysctl_overcommit_ratio,
968 .maxlen = sizeof(sysctl_overcommit_ratio),
969 .mode = 0644,
970 .proc_handler = &proc_dointvec,
971 },
972 {
973 .ctl_name = VM_PAGE_CLUSTER,
974 .procname = "page-cluster",
975 .data = &page_cluster,
976 .maxlen = sizeof(int),
977 .mode = 0644,
978 .proc_handler = &proc_dointvec,
979 },
980 {
981 .ctl_name = VM_DIRTY_BACKGROUND,
982 .procname = "dirty_background_ratio",
983 .data = &dirty_background_ratio,
984 .maxlen = sizeof(dirty_background_ratio),
985 .mode = 0644,
2da02997 986 .proc_handler = &dirty_background_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_background_bytes",
994 .data = &dirty_background_bytes,
995 .maxlen = sizeof(dirty_background_bytes),
996 .mode = 0644,
997 .proc_handler = &dirty_background_bytes_handler,
998 .strategy = &sysctl_intvec,
fc3501d4 999 .extra1 = &one_ul,
2da02997 1000 },
1da177e4
LT		 1001 {
1002 .ctl_name = VM_DIRTY_RATIO,
1003 .procname = "dirty_ratio",
1004 .data = &vm_dirty_ratio,
1005 .maxlen = sizeof(vm_dirty_ratio),
1006 .mode = 0644,
04fbfdc1 1007 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1008 .strategy = &sysctl_intvec,
1009 .extra1 = &zero,
1010 .extra2 = &one_hundred,
1011 },
2da02997
DR		 1012 {
1013 .ctl_name = CTL_UNNUMBERED,
1014 .procname = "dirty_bytes",
1015 .data = &vm_dirty_bytes,
1016 .maxlen = sizeof(vm_dirty_bytes),
1017 .mode = 0644,
1018 .proc_handler = &dirty_bytes_handler,
1019 .strategy = &sysctl_intvec,
fc3501d4 1020 .extra1 = &one_ul,
2da02997 1021 },
1da177e4 1022 {
1da177e4 1023 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1024 .data = &dirty_writeback_interval,
1025 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1026 .mode = 0644,
1027 .proc_handler = &dirty_writeback_centisecs_handler,
1028 },
1029 {
1da177e4 1030 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1031 .data = &dirty_expire_interval,
1032 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1033 .mode = 0644,
704503d8 1034 .proc_handler = &proc_dointvec,
1da177e4
LT		 1035 },
1036 {
1037 .ctl_name = VM_NR_PDFLUSH_THREADS,
1038 .procname = "nr_pdflush_threads",
1039 .data = &nr_pdflush_threads,
1040 .maxlen = sizeof nr_pdflush_threads,
1041 .mode = 0444 /* read-only*/,
1042 .proc_handler = &proc_dointvec,
1043 },
fafd688e
PM		 1044 {
1045 .ctl_name = CTL_UNNUMBERED,
1046 .procname = "nr_pdflush_threads_min",
1047 .data = &nr_pdflush_threads_min,
1048 .maxlen = sizeof nr_pdflush_threads_min,
1049 .mode = 0644 /* read-write */,
1050 .proc_handler = &proc_dointvec_minmax,
1051 .strategy = &sysctl_intvec,
1052 .extra1 = &one,
1053 .extra2 = &nr_pdflush_threads_max,
1054 },
1055 {
1056 .ctl_name = CTL_UNNUMBERED,
1057 .procname = "nr_pdflush_threads_max",
1058 .data = &nr_pdflush_threads_max,
1059 .maxlen = sizeof nr_pdflush_threads_max,
1060 .mode = 0644 /* read-write */,
1061 .proc_handler = &proc_dointvec_minmax,
1062 .strategy = &sysctl_intvec,
1063 .extra1 = &nr_pdflush_threads_min,
1064 .extra2 = &one_thousand,
1065 },
1da177e4
LT		 1066 {
1067 .ctl_name = VM_SWAPPINESS,
1068 .procname = "swappiness",
1069 .data = &vm_swappiness,
1070 .maxlen = sizeof(vm_swappiness),
1071 .mode = 0644,
1072 .proc_handler = &proc_dointvec_minmax,
1073 .strategy = &sysctl_intvec,
1074 .extra1 = &zero,
1075 .extra2 = &one_hundred,
1076 },
1077#ifdef CONFIG_HUGETLB_PAGE
1078 {
1da177e4 1079 .procname = "nr_hugepages",
e5ff2159 1080 .data = NULL,
1da177e4
LT		 1081 .maxlen = sizeof(unsigned long),
1082 .mode = 0644,
1083 .proc_handler = &hugetlb_sysctl_handler,
1084 .extra1 = (void *)&hugetlb_zero,
1085 .extra2 = (void *)&hugetlb_infinity,
1086 },
1087 {
1088 .ctl_name = VM_HUGETLB_GROUP,
1089 .procname = "hugetlb_shm_group",
1090 .data = &sysctl_hugetlb_shm_group,
1091 .maxlen = sizeof(gid_t),
1092 .mode = 0644,
1093 .proc_handler = &proc_dointvec,
1094 },
396faf03
MG		 1095 {
1096 .ctl_name = CTL_UNNUMBERED,
1097 .procname = "hugepages_treat_as_movable",
1098 .data = &hugepages_treat_as_movable,
1099 .maxlen = sizeof(int),
1100 .mode = 0644,
1101 .proc_handler = &hugetlb_treat_movable_handler,
1102 },
d1c3fb1f
NA		 1103 {
1104 .ctl_name = CTL_UNNUMBERED,
1105 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1106 .data = NULL,
1107 .maxlen = sizeof(unsigned long),
d1c3fb1f 1108 .mode = 0644,
a3d0c6aa 1109 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1110 .extra1 = (void *)&hugetlb_zero,
1111 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1112 },
1da177e4
LT		 1113#endif
1114 {
1115 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1116 .procname = "lowmem_reserve_ratio",
1117 .data = &sysctl_lowmem_reserve_ratio,
1118 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1119 .mode = 0644,
1120 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1121 .strategy = &sysctl_intvec,
1122 },
9d0243bc
AM		 1123 {
1124 .ctl_name = VM_DROP_PAGECACHE,
1125 .procname = "drop_caches",
1126 .data = &sysctl_drop_caches,
1127 .maxlen = sizeof(int),
1128 .mode = 0644,
1129 .proc_handler = drop_caches_sysctl_handler,
1130 .strategy = &sysctl_intvec,
1131 },
1da177e4
LT		 1132 {
1133 .ctl_name = VM_MIN_FREE_KBYTES,
1134 .procname = "min_free_kbytes",
1135 .data = &min_free_kbytes,
1136 .maxlen = sizeof(min_free_kbytes),
1137 .mode = 0644,
1138 .proc_handler = &min_free_kbytes_sysctl_handler,
1139 .strategy = &sysctl_intvec,
1140 .extra1 = &zero,
1141 },
8ad4b1fb
RS		 1142 {
1143 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1144 .procname = "percpu_pagelist_fraction",
1145 .data = &percpu_pagelist_fraction,
1146 .maxlen = sizeof(percpu_pagelist_fraction),
1147 .mode = 0644,
1148 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1149 .strategy = &sysctl_intvec,
1150 .extra1 = &min_percpu_pagelist_fract,
1151 },
1da177e4
LT		 1152#ifdef CONFIG_MMU
1153 {
1154 .ctl_name = VM_MAX_MAP_COUNT,
1155 .procname = "max_map_count",
1156 .data = &sysctl_max_map_count,
1157 .maxlen = sizeof(sysctl_max_map_count),
1158 .mode = 0644,
1159 .proc_handler = &proc_dointvec
1160 },
dd8632a1
PM		 1161#else
1162 {
1163 .ctl_name = CTL_UNNUMBERED,
1164 .procname = "nr_trim_pages",
1165 .data = &sysctl_nr_trim_pages,
1166 .maxlen = sizeof(sysctl_nr_trim_pages),
1167 .mode = 0644,
1168 .proc_handler = &proc_dointvec_minmax,
1169 .strategy = &sysctl_intvec,
1170 .extra1 = &zero,
1171 },
1da177e4
LT		 1172#endif
1173 {
1174 .ctl_name = VM_LAPTOP_MODE,
1175 .procname = "laptop_mode",
1176 .data = &laptop_mode,
1177 .maxlen = sizeof(laptop_mode),
1178 .mode = 0644,
ed5b43f1
BS		 1179 .proc_handler = &proc_dointvec_jiffies,
1180 .strategy = &sysctl_jiffies,
1da177e4
LT		 1181 },
1182 {
1183 .ctl_name = VM_BLOCK_DUMP,
1184 .procname = "block_dump",
1185 .data = &block_dump,
1186 .maxlen = sizeof(block_dump),
1187 .mode = 0644,
1188 .proc_handler = &proc_dointvec,
1189 .strategy = &sysctl_intvec,
1190 .extra1 = &zero,
1191 },
1192 {
1193 .ctl_name = VM_VFS_CACHE_PRESSURE,
1194 .procname = "vfs_cache_pressure",
1195 .data = &sysctl_vfs_cache_pressure,
1196 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1197 .mode = 0644,
1198 .proc_handler = &proc_dointvec,
1199 .strategy = &sysctl_intvec,
1200 .extra1 = &zero,
1201 },
1202#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1203 {
1204 .ctl_name = VM_LEGACY_VA_LAYOUT,
1205 .procname = "legacy_va_layout",
1206 .data = &sysctl_legacy_va_layout,
1207 .maxlen = sizeof(sysctl_legacy_va_layout),
1208 .mode = 0644,
1209 .proc_handler = &proc_dointvec,
1210 .strategy = &sysctl_intvec,
1211 .extra1 = &zero,
1212 },
1213#endif
1743660b
CL		 1214#ifdef CONFIG_NUMA
1215 {
1216 .ctl_name = VM_ZONE_RECLAIM_MODE,
1217 .procname = "zone_reclaim_mode",
1218 .data = &zone_reclaim_mode,
1219 .maxlen = sizeof(zone_reclaim_mode),
1220 .mode = 0644,
1221 .proc_handler = &proc_dointvec,
c84db23c
CL		 1222 .strategy = &sysctl_intvec,
1223 .extra1 = &zero,
1743660b 1224 },
9614634f
CL		 1225 {
1226 .ctl_name = VM_MIN_UNMAPPED,
1227 .procname = "min_unmapped_ratio",
1228 .data = &sysctl_min_unmapped_ratio,
1229 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1230 .mode = 0644,
1231 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1232 .strategy = &sysctl_intvec,
1233 .extra1 = &zero,
1234 .extra2 = &one_hundred,
1235 },
0ff38490
CL		 1236 {
1237 .ctl_name = VM_MIN_SLAB,
1238 .procname = "min_slab_ratio",
1239 .data = &sysctl_min_slab_ratio,
1240 .maxlen = sizeof(sysctl_min_slab_ratio),
1241 .mode = 0644,
1242 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1243 .strategy = &sysctl_intvec,
1244 .extra1 = &zero,
1245 .extra2 = &one_hundred,
1246 },
e6e5494c 1247#endif
77461ab3
CL		 1248#ifdef CONFIG_SMP
1249 {
1250 .ctl_name = CTL_UNNUMBERED,
1251 .procname = "stat_interval",
1252 .data = &sysctl_stat_interval,
1253 .maxlen = sizeof(sysctl_stat_interval),
1254 .mode = 0644,
1255 .proc_handler = &proc_dointvec_jiffies,
1256 .strategy = &sysctl_jiffies,
1257 },
1258#endif
ed032189
EP		 1259#ifdef CONFIG_SECURITY
1260 {
1261 .ctl_name = CTL_UNNUMBERED,
1262 .procname = "mmap_min_addr",
1263 .data = &mmap_min_addr,
1264 .maxlen = sizeof(unsigned long),
1265 .mode = 0644,
1266 .proc_handler = &proc_doulongvec_minmax,
1267 },
8daec965 1268#endif
f0c0b2b8
KH		 1269#ifdef CONFIG_NUMA
1270 {
1271 .ctl_name = CTL_UNNUMBERED,
1272 .procname = "numa_zonelist_order",
1273 .data = &numa_zonelist_order,
1274 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1275 .mode = 0644,
1276 .proc_handler = &numa_zonelist_order_handler,
1277 .strategy = &sysctl_string,
1278 },
1279#endif
2b8232ce 1280#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1281 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1282 {
1283 .ctl_name = VM_VDSO_ENABLED,
1284 .procname = "vdso_enabled",
1285 .data = &vdso_enabled,
1286 .maxlen = sizeof(vdso_enabled),
1287 .mode = 0644,
1288 .proc_handler = &proc_dointvec,
1289 .strategy = &sysctl_intvec,
1290 .extra1 = &zero,
1291 },
1da177e4 1292#endif
195cf453
BG		 1293#ifdef CONFIG_HIGHMEM
1294 {
1295 .ctl_name = CTL_UNNUMBERED,
1296 .procname = "highmem_is_dirtyable",
1297 .data = &vm_highmem_is_dirtyable,
1298 .maxlen = sizeof(vm_highmem_is_dirtyable),
1299 .mode = 0644,
1300 .proc_handler = &proc_dointvec_minmax,
1301 .strategy = &sysctl_intvec,
1302 .extra1 = &zero,
1303 .extra2 = &one,
1304 },
1305#endif
4be6f6bb
PZ		 1306#ifdef CONFIG_UNEVICTABLE_LRU
1307 {
1308 .ctl_name = CTL_UNNUMBERED,
1309 .procname = "scan_unevictable_pages",
1310 .data = &scan_unevictable_pages,
1311 .maxlen = sizeof(scan_unevictable_pages),
1312 .mode = 0644,
1313 .proc_handler = &scan_unevictable_handler,
1314 },
1315#endif
2be7fe07
AM		 1316/*
1317 * NOTE: do not add new entries to this table unless you have read
1318 * Documentation/sysctl/ctl_unnumbered.txt
1319 */
1da177e4
LT		 1320 { .ctl_name = 0 }
1321};
1322
2abc26fc 1323#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1324static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1325 { .ctl_name = 0 }
1326};
1327#endif
1328
d8217f07 1329static struct ctl_table fs_table[] = {
1da177e4
LT		 1330 {
1331 .ctl_name = FS_NRINODE,
1332 .procname = "inode-nr",
1333 .data = &inodes_stat,
1334 .maxlen = 2*sizeof(int),
1335 .mode = 0444,
1336 .proc_handler = &proc_dointvec,
1337 },
1338 {
1339 .ctl_name = FS_STATINODE,
1340 .procname = "inode-state",
1341 .data = &inodes_stat,
1342 .maxlen = 7*sizeof(int),
1343 .mode = 0444,
1344 .proc_handler = &proc_dointvec,
1345 },
1346 {
1da177e4
LT		 1347 .procname = "file-nr",
1348 .data = &files_stat,
1349 .maxlen = 3*sizeof(int),
1350 .mode = 0444,
529bf6be 1351 .proc_handler = &proc_nr_files,
1da177e4
LT		 1352 },
1353 {
1354 .ctl_name = FS_MAXFILE,
1355 .procname = "file-max",
1356 .data = &files_stat.max_files,
1357 .maxlen = sizeof(int),
1358 .mode = 0644,
1359 .proc_handler = &proc_dointvec,
1360 },
9cfe015a
ED		 1361 {
1362 .ctl_name = CTL_UNNUMBERED,
1363 .procname = "nr_open",
1364 .data = &sysctl_nr_open,
1365 .maxlen = sizeof(int),
1366 .mode = 0644,
eceea0b3
AV		 1367 .proc_handler = &proc_dointvec_minmax,
1368 .extra1 = &sysctl_nr_open_min,
1369 .extra2 = &sysctl_nr_open_max,
9cfe015a 1370 },
1da177e4
LT		 1371 {
1372 .ctl_name = FS_DENTRY,
1373 .procname = "dentry-state",
1374 .data = &dentry_stat,
1375 .maxlen = 6*sizeof(int),
1376 .mode = 0444,
1377 .proc_handler = &proc_dointvec,
1378 },
1379 {
1380 .ctl_name = FS_OVERFLOWUID,
1381 .procname = "overflowuid",
1382 .data = &fs_overflowuid,
1383 .maxlen = sizeof(int),
1384 .mode = 0644,
1385 .proc_handler = &proc_dointvec_minmax,
1386 .strategy = &sysctl_intvec,
1387 .extra1 = &minolduid,
1388 .extra2 = &maxolduid,
1389 },
1390 {
1391 .ctl_name = FS_OVERFLOWGID,
1392 .procname = "overflowgid",
1393 .data = &fs_overflowgid,
1394 .maxlen = sizeof(int),
1395 .mode = 0644,
1396 .proc_handler = &proc_dointvec_minmax,
1397 .strategy = &sysctl_intvec,
1398 .extra1 = &minolduid,
1399 .extra2 = &maxolduid,
1400 },
bfcd17a6 1401#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1402 {
1403 .ctl_name = FS_LEASES,
1404 .procname = "leases-enable",
1405 .data = &leases_enable,
1406 .maxlen = sizeof(int),
1407 .mode = 0644,
1408 .proc_handler = &proc_dointvec,
1409 },
bfcd17a6 1410#endif
1da177e4
LT		 1411#ifdef CONFIG_DNOTIFY
1412 {
1413 .ctl_name = FS_DIR_NOTIFY,
1414 .procname = "dir-notify-enable",
1415 .data = &dir_notify_enable,
1416 .maxlen = sizeof(int),
1417 .mode = 0644,
1418 .proc_handler = &proc_dointvec,
1419 },
1420#endif
1421#ifdef CONFIG_MMU
bfcd17a6 1422#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1423 {
1424 .ctl_name = FS_LEASE_TIME,
1425 .procname = "lease-break-time",
1426 .data = &lease_break_time,
1427 .maxlen = sizeof(int),
1428 .mode = 0644,
8e654fba 1429 .proc_handler = &proc_dointvec,
1da177e4 1430 },
bfcd17a6 1431#endif
ebf3f09c 1432#ifdef CONFIG_AIO
1da177e4 1433 {
1da177e4
LT		 1434 .procname = "aio-nr",
1435 .data = &aio_nr,
1436 .maxlen = sizeof(aio_nr),
1437 .mode = 0444,
d55b5fda 1438 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1439 },
1440 {
1da177e4
LT		 1441 .procname = "aio-max-nr",
1442 .data = &aio_max_nr,
1443 .maxlen = sizeof(aio_max_nr),
1444 .mode = 0644,
d55b5fda 1445 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1446 },
ebf3f09c 1447#endif /* CONFIG_AIO */
2d9048e2 1448#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1449 {
1450 .ctl_name = FS_INOTIFY,
1451 .procname = "inotify",
1452 .mode = 0555,
1453 .child = inotify_table,
1454 },
1455#endif
7ef9964e
DL		 1456#ifdef CONFIG_EPOLL
1457 {
1458 .procname = "epoll",
1459 .mode = 0555,
1460 .child = epoll_table,
1461 },
1462#endif
1da177e4 1463#endif
d6e71144
AC		 1464 {
1465 .ctl_name = KERN_SETUID_DUMPABLE,
1466 .procname = "suid_dumpable",
1467 .data = &suid_dumpable,
1468 .maxlen = sizeof(int),
1469 .mode = 0644,
8e654fba
MW		 1470 .proc_handler = &proc_dointvec_minmax,
1471 .strategy = &sysctl_intvec,
1472 .extra1 = &zero,
1473 .extra2 = &two,
d6e71144 1474 },
2abc26fc
EB		 1475#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1476 {
1477 .ctl_name = CTL_UNNUMBERED,
1478 .procname = "binfmt_misc",
1479 .mode = 0555,
1480 .child = binfmt_misc_table,
1481 },
1482#endif
2be7fe07
AM		 1483/*
1484 * NOTE: do not add new entries to this table unless you have read
1485 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1486 */
1da177e4
LT		 1487 { .ctl_name = 0 }
1488};
1489
d8217f07 1490static struct ctl_table debug_table[] = {
d0c3d534 1491#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1492 {
1493 .ctl_name = CTL_UNNUMBERED,
1494 .procname = "exception-trace",
1495 .data = &show_unhandled_signals,
1496 .maxlen = sizeof(int),
1497 .mode = 0644,
1498 .proc_handler = proc_dointvec
1499 },
1500#endif
1da177e4
LT		 1501 { .ctl_name = 0 }
1502};
1503
d8217f07 1504static struct ctl_table dev_table[] = {
1da177e4 1505 { .ctl_name = 0 }
0eeca283 1506};
1da177e4 1507
330d57fb
AV		 1508static DEFINE_SPINLOCK(sysctl_lock);
1509
1510/* called under sysctl_lock */
1511static int use_table(struct ctl_table_header *p)
1512{
1513 if (unlikely(p->unregistering))
1514 return 0;
1515 p->used++;
1516 return 1;
1517}
1518
1519/* called under sysctl_lock */
1520static void unuse_table(struct ctl_table_header *p)
1521{
1522 if (!--p->used)
1523 if (unlikely(p->unregistering))
1524 complete(p->unregistering);
1525}
1526
1527/* called under sysctl_lock, will reacquire if has to wait */
1528static void start_unregistering(struct ctl_table_header *p)
1529{
1530 /*
1531 * if p->used is 0, nobody will ever touch that entry again;
1532 * we'll eliminate all paths to it before dropping sysctl_lock
1533 */
1534 if (unlikely(p->used)) {
1535 struct completion wait;
1536 init_completion(&wait);
1537 p->unregistering = &wait;
1538 spin_unlock(&sysctl_lock);
1539 wait_for_completion(&wait);
1540 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1541 } else {
1542 /* anything non-NULL; we'll never dereference it */
1543 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1544 }
1545 /*
1546 * do not remove from the list until nobody holds it; walking the
1547 * list in do_sysctl() relies on that.
1548 */
1549 list_del_init(&p->ctl_entry);
1550}
1551
f7e6ced4
AV		 1552void sysctl_head_get(struct ctl_table_header *head)
1553{
1554 spin_lock(&sysctl_lock);
1555 head->count++;
1556 spin_unlock(&sysctl_lock);
1557}
1558
1559void sysctl_head_put(struct ctl_table_header *head)
1560{
1561 spin_lock(&sysctl_lock);
1562 if (!--head->count)
1563 kfree(head);
1564 spin_unlock(&sysctl_lock);
1565}
1566
1567struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1568{
1569 if (!head)
1570 BUG();
1571 spin_lock(&sysctl_lock);
1572 if (!use_table(head))
1573 head = ERR_PTR(-ENOENT);
1574 spin_unlock(&sysctl_lock);
1575 return head;
1576}
1577
805b5d5e
EB		 1578void sysctl_head_finish(struct ctl_table_header *head)
1579{
1580 if (!head)
1581 return;
1582 spin_lock(&sysctl_lock);
1583 unuse_table(head);
1584 spin_unlock(&sysctl_lock);
1585}
1586
73455092
AV		 1587static struct ctl_table_set *
1588lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1589{
1590 struct ctl_table_set *set = &root->default_set;
1591 if (root->lookup)
1592 set = root->lookup(root, namespaces);
1593 return set;
1594}
1595
e51b6ba0
EB		 1596static struct list_head *
1597lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1598{
73455092
AV		 1599 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1600 return &set->list;
e51b6ba0
EB		 1601}
1602
1603struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1604 struct ctl_table_header *prev)
1605{
1606 struct ctl_table_root *root;
1607 struct list_head *header_list;
805b5d5e
EB		 1608 struct ctl_table_header *head;
1609 struct list_head *tmp;
e51b6ba0 1610
805b5d5e
EB		 1611 spin_lock(&sysctl_lock);
1612 if (prev) {
e51b6ba0 1613 head = prev;
805b5d5e
EB		 1614 tmp = &prev->ctl_entry;
1615 unuse_table(prev);
1616 goto next;
1617 }
1618 tmp = &root_table_header.ctl_entry;
1619 for (;;) {
1620 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1621
1622 if (!use_table(head))
1623 goto next;
1624 spin_unlock(&sysctl_lock);
1625 return head;
1626 next:
e51b6ba0 1627 root = head->root;
805b5d5e 1628 tmp = tmp->next;
e51b6ba0
EB		 1629 header_list = lookup_header_list(root, namespaces);
1630 if (tmp != header_list)
1631 continue;
1632
1633 do {
1634 root = list_entry(root->root_list.next,
1635 struct ctl_table_root, root_list);
1636 if (root == &sysctl_table_root)
1637 goto out;
1638 header_list = lookup_header_list(root, namespaces);
1639 } while (list_empty(header_list));
1640 tmp = header_list->next;
805b5d5e 1641 }
e51b6ba0 1642out:
805b5d5e
EB		 1643 spin_unlock(&sysctl_lock);
1644 return NULL;
1645}
1646
e51b6ba0
EB		 1647struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1648{
1649 return __sysctl_head_next(current->nsproxy, prev);
1650}
1651
1652void register_sysctl_root(struct ctl_table_root *root)
1653{
1654 spin_lock(&sysctl_lock);
1655 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1656 spin_unlock(&sysctl_lock);
1657}
1658
b89a8171 1659#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1660/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1661static int do_sysctl_strategy(struct ctl_table_root *root,
1662 struct ctl_table *table,
2c4c7155
PE		 1663 void __user *oldval, size_t __user *oldlenp,
1664 void __user *newval, size_t newlen)
1665{
1666 int op = 0, rc;
1667
1668 if (oldval)
e6305c43 1669 op |= MAY_READ;
2c4c7155 1670 if (newval)
e6305c43 1671 op |= MAY_WRITE;
d7321cd6 1672 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1673 return -EPERM;
1674
1675 if (table->strategy) {
f221e726 1676 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1677 if (rc < 0)
1678 return rc;
1679 if (rc > 0)
1680 return 0;
1681 }
1682
1683 /* If there is no strategy routine, or if the strategy returns
1684 * zero, proceed with automatic r/w */
1685 if (table->data && table->maxlen) {
f221e726 1686 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1687 if (rc < 0)
1688 return rc;
1689 }
1690 return 0;
1691}
1692
1693static int parse_table(int __user *name, int nlen,
1694 void __user *oldval, size_t __user *oldlenp,
1695 void __user *newval, size_t newlen,
d7321cd6 1696 struct ctl_table_root *root,
2c4c7155
PE		 1697 struct ctl_table *table)
1698{
1699 int n;
1700repeat:
1701 if (!nlen)
1702 return -ENOTDIR;
1703 if (get_user(n, name))
1704 return -EFAULT;
1705 for ( ; table->ctl_name || table->procname; table++) {
1706 if (!table->ctl_name)
1707 continue;
1708 if (n == table->ctl_name) {
1709 int error;
1710 if (table->child) {
e6305c43 1711 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1712 return -EPERM;
1713 name++;
1714 nlen--;
1715 table = table->child;
1716 goto repeat;
1717 }
f221e726 1718 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1719 oldval, oldlenp,
1720 newval, newlen);
1721 return error;
1722 }
1723 }
1724 return -ENOTDIR;
1725}
1726
1da177e4
LT		 1727int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1728 void __user *newval, size_t newlen)
1729{
805b5d5e 1730 struct ctl_table_header *head;
330d57fb 1731 int error = -ENOTDIR;
1da177e4
LT		 1732
1733 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1734 return -ENOTDIR;
1735 if (oldval) {
1736 int old_len;
1737 if (!oldlenp || get_user(old_len, oldlenp))
1738 return -EFAULT;
1739 }
330d57fb 1740
805b5d5e
EB		 1741 for (head = sysctl_head_next(NULL); head;
1742 head = sysctl_head_next(head)) {
330d57fb 1743 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1744 newval, newlen,
1745 head->root, head->ctl_table);
805b5d5e
EB		 1746 if (error != -ENOTDIR) {
1747 sysctl_head_finish(head);
330d57fb 1748 break;
805b5d5e
EB		 1749 }
1750 }
330d57fb 1751 return error;
1da177e4
LT		 1752}
1753
1e7bfb21 1754SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1755{
1756 struct __sysctl_args tmp;
1757 int error;
1758
1759 if (copy_from_user(&tmp, args, sizeof(tmp)))
1760 return -EFAULT;
1761
7058cb02
EB		 1762 error = deprecated_sysctl_warning(&tmp);
1763 if (error)
1764 goto out;
1765
1da177e4
LT		 1766 lock_kernel();
1767 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1768 tmp.newval, tmp.newlen);
1769 unlock_kernel();
7058cb02 1770out:
1da177e4
LT		 1771 return error;
1772}
b89a8171 1773#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1774
1775/*
1ff007eb 1776 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1777 * some sysctl variables are readonly even to root.
1778 */
1779
1780static int test_perm(int mode, int op)
1781{
76aac0e9 1782 if (!current_euid())
1da177e4
LT		 1783 mode >>= 6;
1784 else if (in_egroup_p(0))
1785 mode >>= 3;
e6305c43 1786 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1787 return 0;
1788 return -EACCES;
1789}
1790
d7321cd6 1791int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1792{
1793 int error;
d7321cd6
PE		 1794 int mode;
1795
e6305c43 1796 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1797 if (error)
1798 return error;
d7321cd6
PE		 1799
1800 if (root->permissions)
1801 mode = root->permissions(root, current->nsproxy, table);
1802 else
1803 mode = table->mode;
1804
1805 return test_perm(mode, op);
1da177e4
LT		 1806}
1807
d912b0cc
EB		 1808static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1809{
1810 for (; table->ctl_name || table->procname; table++) {
1811 table->parent = parent;
1812 if (table->child)
1813 sysctl_set_parent(table, table->child);
1814 }
1815}
1816
1817static __init int sysctl_init(void)
1818{
1819 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1820#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1821 {
1822 int err;
1823 err = sysctl_check_table(current->nsproxy, root_table);
1824 }
1825#endif
d912b0cc
EB		 1826 return 0;
1827}
1828
1829core_initcall(sysctl_init);
1830
bfbcf034
AV		 1831static struct ctl_table *is_branch_in(struct ctl_table *branch,
1832 struct ctl_table *table)
ae7edecc
AV		 1833{
1834 struct ctl_table *p;
1835 const char *s = branch->procname;
1836
1837 /* branch should have named subdirectory as its first element */
1838 if (!s || !branch->child)
bfbcf034 1839 return NULL;
ae7edecc
AV		 1840
1841 /* ... and nothing else */
1842 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1843 return NULL;
ae7edecc
AV		 1844
1845 /* table should contain subdirectory with the same name */
1846 for (p = table; p->procname || p->ctl_name; p++) {
1847 if (!p->child)
1848 continue;
1849 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1850 return p;
ae7edecc 1851 }
bfbcf034 1852 return NULL;
ae7edecc
AV		 1853}
1854
1855/* see if attaching q to p would be an improvement */
1856static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1857{
1858 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1859 struct ctl_table *next;
ae7edecc
AV		 1860 int is_better = 0;
1861 int not_in_parent = !p->attached_by;
1862
bfbcf034 1863 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1864 if (by == q->attached_by)
1865 is_better = 1;
1866 if (to == p->attached_by)
1867 not_in_parent = 1;
1868 by = by->child;
bfbcf034 1869 to = next->child;
ae7edecc
AV		 1870 }
1871
1872 if (is_better && not_in_parent) {
1873 q->attached_by = by;
1874 q->attached_to = to;
1875 q->parent = p;
1876 }
1877}
1878
1da177e4 1879/**
e51b6ba0
EB		 1880 * __register_sysctl_paths - register a sysctl hierarchy
1881 * @root: List of sysctl headers to register on
1882 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1883 * @path: The path to the directory the sysctl table is in.
1da177e4 1884 * @table: the top-level table structure
1da177e4
LT		 1885 *
1886 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1887 * array. A completely 0 filled entry terminates the table.
1da177e4 1888 *
d8217f07 1889 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1890 *
1891 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1892 * must be unique within that level of sysctl
1893 *
1894 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1895 * enter a sysctl file
1896 *
1897 * data - a pointer to data for use by proc_handler
1898 *
1899 * maxlen - the maximum size in bytes of the data
1900 *
1901 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1902 *
1903 * child - a pointer to the child sysctl table if this entry is a directory, or
1904 * %NULL.
1905 *
1906 * proc_handler - the text handler routine (described below)
1907 *
1908 * strategy - the strategy routine (described below)
1909 *
1910 * de - for internal use by the sysctl routines
1911 *
1912 * extra1, extra2 - extra pointers usable by the proc handler routines
1913 *
1914 * Leaf nodes in the sysctl tree will be represented by a single file
1915 * under /proc; non-leaf nodes will be represented by directories.
1916 *
1917 * sysctl(2) can automatically manage read and write requests through
1918 * the sysctl table. The data and maxlen fields of the ctl_table
1919 * struct enable minimal validation of the values being written to be
1920 * performed, and the mode field allows minimal authentication.
1921 *
1922 * More sophisticated management can be enabled by the provision of a
1923 * strategy routine with the table entry. This will be called before
1924 * any automatic read or write of the data is performed.
1925 *
1926 * The strategy routine may return
1927 *
1928 * < 0 - Error occurred (error is passed to user process)
1929 *
1930 * 0 - OK - proceed with automatic read or write.
1931 *
1932 * > 0 - OK - read or write has been done by the strategy routine, so
1933 * return immediately.
1934 *
1935 * There must be a proc_handler routine for any terminal nodes
1936 * mirrored under /proc/sys (non-terminals are handled by a built-in
1937 * directory handler). Several default handlers are available to
1938 * cover common cases -
1939 *
1940 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1941 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1942 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1943 *
1944 * It is the handler's job to read the input buffer from user memory
1945 * and process it. The handler should return 0 on success.
1946 *
1947 * This routine returns %NULL on a failure to register, and a pointer
1948 * to the table header on success.
1949 */
e51b6ba0
EB		 1950struct ctl_table_header *__register_sysctl_paths(
1951 struct ctl_table_root *root,
1952 struct nsproxy *namespaces,
1953 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1954{
29e796fd
EB		 1955 struct ctl_table_header *header;
1956 struct ctl_table *new, **prevp;
1957 unsigned int n, npath;
ae7edecc 1958 struct ctl_table_set *set;
29e796fd
EB		 1959
1960 /* Count the path components */
1961 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1962 ;
1963
1964 /*
1965 * For each path component, allocate a 2-element ctl_table array.
1966 * The first array element will be filled with the sysctl entry
1967 * for this, the second will be the sentinel (ctl_name == 0).
1968 *
1969 * We allocate everything in one go so that we don't have to
1970 * worry about freeing additional memory in unregister_sysctl_table.
1971 */
1972 header = kzalloc(sizeof(struct ctl_table_header) +
1973 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1974 if (!header)
1da177e4 1975 return NULL;
29e796fd
EB		 1976
1977 new = (struct ctl_table *) (header + 1);
1978
1979 /* Now connect the dots */
1980 prevp = &header->ctl_table;
1981 for (n = 0; n < npath; ++n, ++path) {
1982 /* Copy the procname */
1983 new->procname = path->procname;
1984 new->ctl_name = path->ctl_name;
1985 new->mode = 0555;
1986
1987 *prevp = new;
1988 prevp = &new->child;
1989
1990 new += 2;
1991 }
1992 *prevp = table;
23eb06de 1993 header->ctl_table_arg = table;
29e796fd
EB		 1994
1995 INIT_LIST_HEAD(&header->ctl_entry);
1996 header->used = 0;
1997 header->unregistering = NULL;
e51b6ba0 1998 header->root = root;
29e796fd 1999 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 2000 header->count = 1;
88f458e4 2001#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 2002 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 2003 kfree(header);
fc6cd25b
EB		 2004 return NULL;
2005 }
88f458e4 2006#endif
330d57fb 2007 spin_lock(&sysctl_lock);
73455092 2008 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 2009 header->attached_by = header->ctl_table;
2010 header->attached_to = root_table;
2011 header->parent = &root_table_header;
2012 for (set = header->set; set; set = set->parent) {
2013 struct ctl_table_header *p;
2014 list_for_each_entry(p, &set->list, ctl_entry) {
2015 if (p->unregistering)
2016 continue;
2017 try_attach(p, header);
2018 }
2019 }
2020 header->parent->count++;
73455092 2021 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 2022 spin_unlock(&sysctl_lock);
29e796fd
EB		 2023
2024 return header;
2025}
2026
e51b6ba0
EB		 2027/**
2028 * register_sysctl_table_path - register a sysctl table hierarchy
2029 * @path: The path to the directory the sysctl table is in.
2030 * @table: the top-level table structure
2031 *
2032 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2033 * array. A completely 0 filled entry terminates the table.
2034 *
2035 * See __register_sysctl_paths for more details.
2036 */
2037struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2038 struct ctl_table *table)
2039{
2040 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2041 path, table);
2042}
2043
29e796fd
EB		 2044/**
2045 * register_sysctl_table - register a sysctl table hierarchy
2046 * @table: the top-level table structure
2047 *
2048 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2049 * array. A completely 0 filled entry terminates the table.
2050 *
2051 * See register_sysctl_paths for more details.
2052 */
2053struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2054{
2055 static const struct ctl_path null_path[] = { {} };
2056
2057 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2058}
2059
2060/**
2061 * unregister_sysctl_table - unregister a sysctl table hierarchy
2062 * @header: the header returned from register_sysctl_table
2063 *
2064 * Unregisters the sysctl table and all children. proc entries may not
2065 * actually be removed until they are no longer used by anyone.
2066 */
2067void unregister_sysctl_table(struct ctl_table_header * header)
2068{
330d57fb 2069 might_sleep();
f1dad166
PE		 2070
2071 if (header == NULL)
2072 return;
2073
330d57fb
AV		 2074 spin_lock(&sysctl_lock);
2075 start_unregistering(header);
ae7edecc
AV		 2076 if (!--header->parent->count) {
2077 WARN_ON(1);
2078 kfree(header->parent);
2079 }
f7e6ced4
AV		 2080 if (!--header->count)
2081 kfree(header);
330d57fb 2082 spin_unlock(&sysctl_lock);
1da177e4
LT		 2083}
2084
9043476f
AV		 2085int sysctl_is_seen(struct ctl_table_header *p)
2086{
2087 struct ctl_table_set *set = p->set;
2088 int res;
2089 spin_lock(&sysctl_lock);
2090 if (p->unregistering)
2091 res = 0;
2092 else if (!set->is_seen)
2093 res = 1;
2094 else
2095 res = set->is_seen(set);
2096 spin_unlock(&sysctl_lock);
2097 return res;
2098}
2099
73455092
AV		 2100void setup_sysctl_set(struct ctl_table_set *p,
2101 struct ctl_table_set *parent,
2102 int (*is_seen)(struct ctl_table_set *))
2103{
2104 INIT_LIST_HEAD(&p->list);
2105 p->parent = parent ? parent : &sysctl_table_root.default_set;
2106 p->is_seen = is_seen;
2107}
2108
b89a8171 2109#else /* !CONFIG_SYSCTL */
d8217f07 2110struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2111{
2112 return NULL;
2113}
2114
29e796fd
EB		 2115struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2116 struct ctl_table *table)
2117{
2118 return NULL;
2119}
2120
b89a8171
EB		 2121void unregister_sysctl_table(struct ctl_table_header * table)
2122{
2123}
2124
73455092
AV		 2125void setup_sysctl_set(struct ctl_table_set *p,
2126 struct ctl_table_set *parent,
2127 int (*is_seen)(struct ctl_table_set *))
2128{
2129}
2130
f7e6ced4
AV		 2131void sysctl_head_put(struct ctl_table_header *head)
2132{
2133}
2134
b89a8171
EB		 2135#endif /* CONFIG_SYSCTL */
2136
1da177e4
LT		 2137/*
2138 * /proc/sys support
2139 */
2140
b89a8171 2141#ifdef CONFIG_PROC_SYSCTL
1da177e4 2142
b1ba4ddd
AB		 2143static int _proc_do_string(void* data, int maxlen, int write,
2144 struct file *filp, void __user *buffer,
2145 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2146{
2147 size_t len;
2148 char __user *p;
2149 char c;
8d060877
ON		 2150
2151 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2152 *lenp = 0;
2153 return 0;
2154 }
8d060877 2155
1da177e4
LT		 2156 if (write) {
2157 len = 0;
2158 p = buffer;
2159 while (len < *lenp) {
2160 if (get_user(c, p++))
2161 return -EFAULT;
2162 if (c == 0 || c == '\n')
2163 break;
2164 len++;
2165 }
f5dd3d6f
SV		 2166 if (len >= maxlen)
2167 len = maxlen-1;
2168 if(copy_from_user(data, buffer, len))
1da177e4 2169 return -EFAULT;
f5dd3d6f 2170 ((char *) data)[len] = 0;
1da177e4
LT		 2171 *ppos += *lenp;
2172 } else {
f5dd3d6f
SV		 2173 len = strlen(data);
2174 if (len > maxlen)
2175 len = maxlen;
8d060877
ON		 2176
2177 if (*ppos > len) {
2178 *lenp = 0;
2179 return 0;
2180 }
2181
2182 data += *ppos;
2183 len -= *ppos;
2184
1da177e4
LT		 2185 if (len > *lenp)
2186 len = *lenp;
2187 if (len)
f5dd3d6f 2188 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2189 return -EFAULT;
2190 if (len < *lenp) {
2191 if(put_user('\n', ((char __user *) buffer) + len))
2192 return -EFAULT;
2193 len++;
2194 }
2195 *lenp = len;
2196 *ppos += len;
2197 }
2198 return 0;
2199}
2200
f5dd3d6f
SV		 2201/**
2202 * proc_dostring - read a string sysctl
2203 * @table: the sysctl table
2204 * @write: %TRUE if this is a write to the sysctl file
2205 * @filp: the file structure
2206 * @buffer: the user buffer
2207 * @lenp: the size of the user buffer
2208 * @ppos: file position
2209 *
2210 * Reads/writes a string from/to the user buffer. If the kernel
2211 * buffer provided is not large enough to hold the string, the
2212 * string is truncated. The copied string is %NULL-terminated.
2213 * If the string is being read by the user process, it is copied
2214 * and a newline '\n' is added. It is truncated if the buffer is
2215 * not large enough.
2216 *
2217 * Returns 0 on success.
2218 */
d8217f07 2219int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2220 void __user *buffer, size_t *lenp, loff_t *ppos)
2221{
2222 return _proc_do_string(table->data, table->maxlen, write, filp,
2223 buffer, lenp, ppos);
2224}
2225
1da177e4
LT		 2226
2227static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2228 int *valp,
2229 int write, void *data)
2230{
2231 if (write) {
2232 *valp = *negp ? -*lvalp : *lvalp;
2233 } else {
2234 int val = *valp;
2235 if (val < 0) {
2236 *negp = -1;
2237 *lvalp = (unsigned long)-val;
2238 } else {
2239 *negp = 0;
2240 *lvalp = (unsigned long)val;
2241 }
2242 }
2243 return 0;
2244}
2245
d8217f07 2246static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2247 int write, struct file *filp, void __user *buffer,
2248 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2249 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2250 int write, void *data),
2251 void *data)
2252{
2253#define TMPBUFLEN 21
2254 int *i, vleft, first=1, neg, val;
2255 unsigned long lval;
2256 size_t left, len;
2257
2258 char buf[TMPBUFLEN], *p;
2259 char __user *s = buffer;
2260
fcfbd547 2261 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2262 (*ppos && !write)) {
2263 *lenp = 0;
2264 return 0;
2265 }
2266
fcfbd547 2267 i = (int *) tbl_data;
1da177e4
LT		 2268 vleft = table->maxlen / sizeof(*i);
2269 left = *lenp;
2270
2271 if (!conv)
2272 conv = do_proc_dointvec_conv;
2273
2274 for (; left && vleft--; i++, first=0) {
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 s++;
2284 }
2285 if (!left)
2286 break;
2287 neg = 0;
2288 len = left;
2289 if (len > sizeof(buf) - 1)
2290 len = sizeof(buf) - 1;
2291 if (copy_from_user(buf, s, len))
2292 return -EFAULT;
2293 buf[len] = 0;
2294 p = buf;
2295 if (*p == '-' && left > 1) {
2296 neg = 1;
bd9b0bac 2297 p++;
1da177e4
LT		 2298 }
2299 if (*p < '0' || *p > '9')
2300 break;
2301
2302 lval = simple_strtoul(p, &p, 0);
2303
2304 len = p-buf;
2305 if ((len < left) && *p && !isspace(*p))
2306 break;
2307 if (neg)
2308 val = -val;
2309 s += len;
2310 left -= len;
2311
2312 if (conv(&neg, &lval, i, 1, data))
2313 break;
2314 } else {
2315 p = buf;
2316 if (!first)
2317 *p++ = '\t';
2318
2319 if (conv(&neg, &lval, i, 0, data))
2320 break;
2321
2322 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2323 len = strlen(buf);
2324 if (len > left)
2325 len = left;
2326 if(copy_to_user(s, buf, len))
2327 return -EFAULT;
2328 left -= len;
2329 s += len;
2330 }
2331 }
2332
2333 if (!write && !first && left) {
2334 if(put_user('\n', s))
2335 return -EFAULT;
2336 left--, s++;
2337 }
2338 if (write) {
2339 while (left) {
2340 char c;
2341 if (get_user(c, s++))
2342 return -EFAULT;
2343 if (!isspace(c))
2344 break;
2345 left--;
2346 }
2347 }
2348 if (write && first)
2349 return -EINVAL;
2350 *lenp -= left;
2351 *ppos += *lenp;
2352 return 0;
2353#undef TMPBUFLEN
2354}
2355
d8217f07 2356static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2357 void __user *buffer, size_t *lenp, loff_t *ppos,
2358 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2359 int write, void *data),
2360 void *data)
2361{
2362 return __do_proc_dointvec(table->data, table, write, filp,
2363 buffer, lenp, ppos, conv, data);
2364}
2365
1da177e4
LT		 2366/**
2367 * proc_dointvec - read a vector of integers
2368 * @table: the sysctl table
2369 * @write: %TRUE if this is a write to the sysctl file
2370 * @filp: the file structure
2371 * @buffer: the user buffer
2372 * @lenp: the size of the user buffer
2373 * @ppos: file position
2374 *
2375 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2376 * values from/to the user buffer, treated as an ASCII string.
2377 *
2378 * Returns 0 on success.
2379 */
d8217f07 2380int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2381 void __user *buffer, size_t *lenp, loff_t *ppos)
2382{
2383 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2384 NULL,NULL);
2385}
2386
34f5a398 2387/*
25ddbb18
AK		 2388 * Taint values can only be increased
2389 * This means we can safely use a temporary.
34f5a398 2390 */
25ddbb18 2391static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2392 void __user *buffer, size_t *lenp, loff_t *ppos)
2393{
25ddbb18
AK		 2394 struct ctl_table t;
2395 unsigned long tmptaint = get_taint();
2396 int err;
34f5a398 2397
91fcd412 2398 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2399 return -EPERM;
2400
25ddbb18
AK		 2401 t = *table;
2402 t.data = &tmptaint;
2403 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2404 if (err < 0)
2405 return err;
2406
2407 if (write) {
2408 /*
2409 * Poor man's atomic or. Not worth adding a primitive
2410 * to everyone's atomic.h for this
2411 */
2412 int i;
2413 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2414 if ((tmptaint >> i) & 1)
2415 add_taint(i);
2416 }
2417 }
2418
2419 return err;
34f5a398
TT		 2420}
2421
1da177e4
LT		 2422struct do_proc_dointvec_minmax_conv_param {
2423 int *min;
2424 int *max;
2425};
2426
2427static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2428 int *valp,
2429 int write, void *data)
2430{
2431 struct do_proc_dointvec_minmax_conv_param *param = data;
2432 if (write) {
2433 int val = *negp ? -*lvalp : *lvalp;
2434 if ((param->min && *param->min > val) ||
2435 (param->max && *param->max < val))
2436 return -EINVAL;
2437 *valp = val;
2438 } else {
2439 int val = *valp;
2440 if (val < 0) {
2441 *negp = -1;
2442 *lvalp = (unsigned long)-val;
2443 } else {
2444 *negp = 0;
2445 *lvalp = (unsigned long)val;
2446 }
2447 }
2448 return 0;
2449}
2450
2451/**
2452 * proc_dointvec_minmax - read a vector of integers with min/max values
2453 * @table: the sysctl table
2454 * @write: %TRUE if this is a write to the sysctl file
2455 * @filp: the file structure
2456 * @buffer: the user buffer
2457 * @lenp: the size of the user buffer
2458 * @ppos: file position
2459 *
2460 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2461 * values from/to the user buffer, treated as an ASCII string.
2462 *
2463 * This routine will ensure the values are within the range specified by
2464 * table->extra1 (min) and table->extra2 (max).
2465 *
2466 * Returns 0 on success.
2467 */
d8217f07 2468int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2469 void __user *buffer, size_t *lenp, loff_t *ppos)
2470{
2471 struct do_proc_dointvec_minmax_conv_param param = {
2472 .min = (int *) table->extra1,
2473 .max = (int *) table->extra2,
2474 };
2475 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2476 do_proc_dointvec_minmax_conv, &param);
2477}
2478
d8217f07 2479static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2480 struct file *filp,
2481 void __user *buffer,
2482 size_t *lenp, loff_t *ppos,
2483 unsigned long convmul,
2484 unsigned long convdiv)
2485{
2486#define TMPBUFLEN 21
2487 unsigned long *i, *min, *max, val;
2488 int vleft, first=1, neg;
2489 size_t len, left;
2490 char buf[TMPBUFLEN], *p;
2491 char __user *s = buffer;
2492
fcfbd547 2493 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2494 (*ppos && !write)) {
2495 *lenp = 0;
2496 return 0;
2497 }
2498
fcfbd547 2499 i = (unsigned long *) data;
1da177e4
LT		 2500 min = (unsigned long *) table->extra1;
2501 max = (unsigned long *) table->extra2;
2502 vleft = table->maxlen / sizeof(unsigned long);
2503 left = *lenp;
2504
2505 for (; left && vleft--; i++, min++, max++, first=0) {
2506 if (write) {
2507 while (left) {
2508 char c;
2509 if (get_user(c, s))
2510 return -EFAULT;
2511 if (!isspace(c))
2512 break;
2513 left--;
2514 s++;
2515 }
2516 if (!left)
2517 break;
2518 neg = 0;
2519 len = left;
2520 if (len > TMPBUFLEN-1)
2521 len = TMPBUFLEN-1;
2522 if (copy_from_user(buf, s, len))
2523 return -EFAULT;
2524 buf[len] = 0;
2525 p = buf;
2526 if (*p == '-' && left > 1) {
2527 neg = 1;
bd9b0bac 2528 p++;
1da177e4
LT		 2529 }
2530 if (*p < '0' || *p > '9')
2531 break;
2532 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2533 len = p-buf;
2534 if ((len < left) && *p && !isspace(*p))
2535 break;
2536 if (neg)
2537 val = -val;
2538 s += len;
2539 left -= len;
2540
2541 if(neg)
2542 continue;
2543 if ((min && val < *min) || (max && val > *max))
2544 continue;
2545 *i = val;
2546 } else {
2547 p = buf;
2548 if (!first)
2549 *p++ = '\t';
2550 sprintf(p, "%lu", convdiv * (*i) / convmul);
2551 len = strlen(buf);
2552 if (len > left)
2553 len = left;
2554 if(copy_to_user(s, buf, len))
2555 return -EFAULT;
2556 left -= len;
2557 s += len;
2558 }
2559 }
2560
2561 if (!write && !first && left) {
2562 if(put_user('\n', s))
2563 return -EFAULT;
2564 left--, s++;
2565 }
2566 if (write) {
2567 while (left) {
2568 char c;
2569 if (get_user(c, s++))
2570 return -EFAULT;
2571 if (!isspace(c))
2572 break;
2573 left--;
2574 }
2575 }
2576 if (write && first)
2577 return -EINVAL;
2578 *lenp -= left;
2579 *ppos += *lenp;
2580 return 0;
2581#undef TMPBUFLEN
2582}
2583
d8217f07 2584static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2585 struct file *filp,
2586 void __user *buffer,
2587 size_t *lenp, loff_t *ppos,
2588 unsigned long convmul,
2589 unsigned long convdiv)
2590{
2591 return __do_proc_doulongvec_minmax(table->data, table, write,
2592 filp, buffer, lenp, ppos, convmul, convdiv);
2593}
2594
1da177e4
LT		 2595/**
2596 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2597 * @table: the sysctl table
2598 * @write: %TRUE if this is a write to the sysctl file
2599 * @filp: the file structure
2600 * @buffer: the user buffer
2601 * @lenp: the size of the user buffer
2602 * @ppos: file position
2603 *
2604 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2605 * values from/to the user buffer, treated as an ASCII string.
2606 *
2607 * This routine will ensure the values are within the range specified by
2608 * table->extra1 (min) and table->extra2 (max).
2609 *
2610 * Returns 0 on success.
2611 */
d8217f07 2612int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2613 void __user *buffer, size_t *lenp, loff_t *ppos)
2614{
2615 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2616}
2617
2618/**
2619 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2620 * @table: the sysctl table
2621 * @write: %TRUE if this is a write to the sysctl file
2622 * @filp: the file structure
2623 * @buffer: the user buffer
2624 * @lenp: the size of the user buffer
2625 * @ppos: file position
2626 *
2627 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2628 * values from/to the user buffer, treated as an ASCII string. The values
2629 * are treated as milliseconds, and converted to jiffies when they are stored.
2630 *
2631 * This routine will ensure the values are within the range specified by
2632 * table->extra1 (min) and table->extra2 (max).
2633 *
2634 * Returns 0 on success.
2635 */
d8217f07 2636int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2637 struct file *filp,
2638 void __user *buffer,
2639 size_t *lenp, loff_t *ppos)
2640{
2641 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2642 lenp, ppos, HZ, 1000l);
2643}
2644
2645
2646static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2647 int *valp,
2648 int write, void *data)
2649{
2650 if (write) {
cba9f33d
BS		 2651 if (*lvalp > LONG_MAX / HZ)
2652 return 1;
1da177e4
LT		 2653 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2654 } else {
2655 int val = *valp;
2656 unsigned long lval;
2657 if (val < 0) {
2658 *negp = -1;
2659 lval = (unsigned long)-val;
2660 } else {
2661 *negp = 0;
2662 lval = (unsigned long)val;
2663 }
2664 *lvalp = lval / HZ;
2665 }
2666 return 0;
2667}
2668
2669static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2670 int *valp,
2671 int write, void *data)
2672{
2673 if (write) {
cba9f33d
BS		 2674 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2675 return 1;
1da177e4
LT		 2676 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2677 } else {
2678 int val = *valp;
2679 unsigned long lval;
2680 if (val < 0) {
2681 *negp = -1;
2682 lval = (unsigned long)-val;
2683 } else {
2684 *negp = 0;
2685 lval = (unsigned long)val;
2686 }
2687 *lvalp = jiffies_to_clock_t(lval);
2688 }
2689 return 0;
2690}
2691
2692static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2693 int *valp,
2694 int write, void *data)
2695{
2696 if (write) {
2697 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2698 } else {
2699 int val = *valp;
2700 unsigned long lval;
2701 if (val < 0) {
2702 *negp = -1;
2703 lval = (unsigned long)-val;
2704 } else {
2705 *negp = 0;
2706 lval = (unsigned long)val;
2707 }
2708 *lvalp = jiffies_to_msecs(lval);
2709 }
2710 return 0;
2711}
2712
2713/**
2714 * proc_dointvec_jiffies - read a vector of integers as seconds
2715 * @table: the sysctl table
2716 * @write: %TRUE if this is a write to the sysctl file
2717 * @filp: the file structure
2718 * @buffer: the user buffer
2719 * @lenp: the size of the user buffer
2720 * @ppos: file position
2721 *
2722 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2723 * values from/to the user buffer, treated as an ASCII string.
2724 * The values read are assumed to be in seconds, and are converted into
2725 * jiffies.
2726 *
2727 * Returns 0 on success.
2728 */
d8217f07 2729int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2730 void __user *buffer, size_t *lenp, loff_t *ppos)
2731{
2732 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2733 do_proc_dointvec_jiffies_conv,NULL);
2734}
2735
2736/**
2737 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2738 * @table: the sysctl table
2739 * @write: %TRUE if this is a write to the sysctl file
2740 * @filp: the file structure
2741 * @buffer: the user buffer
2742 * @lenp: the size of the user buffer
1e5d5331 2743 * @ppos: pointer to the file position
1da177e4
LT		 2744 *
2745 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2746 * values from/to the user buffer, treated as an ASCII string.
2747 * The values read are assumed to be in 1/USER_HZ seconds, and
2748 * are converted into jiffies.
2749 *
2750 * Returns 0 on success.
2751 */
d8217f07 2752int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2753 void __user *buffer, size_t *lenp, loff_t *ppos)
2754{
2755 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2756 do_proc_dointvec_userhz_jiffies_conv,NULL);
2757}
2758
2759/**
2760 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2761 * @table: the sysctl table
2762 * @write: %TRUE if this is a write to the sysctl file
2763 * @filp: the file structure
2764 * @buffer: the user buffer
2765 * @lenp: the size of the user buffer
67be2dd1
MW		 2766 * @ppos: file position
2767 * @ppos: the current position in the file
1da177e4
LT		 2768 *
2769 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2770 * values from/to the user buffer, treated as an ASCII string.
2771 * The values read are assumed to be in 1/1000 seconds, and
2772 * are converted into jiffies.
2773 *
2774 * Returns 0 on success.
2775 */
d8217f07 2776int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2777 void __user *buffer, size_t *lenp, loff_t *ppos)
2778{
2779 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2780 do_proc_dointvec_ms_jiffies_conv, NULL);
2781}
2782
d8217f07 2783static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2784 void __user *buffer, size_t *lenp, loff_t *ppos)
2785{
2786 struct pid *new_pid;
2787 pid_t tmp;
2788 int r;
2789
6c5f3e7b 2790 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2791
2792 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2793 lenp, ppos, NULL, NULL);
2794 if (r || !write)
2795 return r;
2796
2797 new_pid = find_get_pid(tmp);
2798 if (!new_pid)
2799 return -ESRCH;
2800
2801 put_pid(xchg(&cad_pid, new_pid));
2802 return 0;
2803}
2804
1da177e4
LT		 2805#else /* CONFIG_PROC_FS */
2806
d8217f07 2807int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2808 void __user *buffer, size_t *lenp, loff_t *ppos)
2809{
2810 return -ENOSYS;
2811}
2812
d8217f07 2813int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2814 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2815{
2816 return -ENOSYS;
2817}
2818
d8217f07 2819int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2820 void __user *buffer, size_t *lenp, loff_t *ppos)
2821{
2822 return -ENOSYS;
2823}
2824
d8217f07 2825int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2826 void __user *buffer, size_t *lenp, loff_t *ppos)
2827{
2828 return -ENOSYS;
2829}
2830
d8217f07 2831int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2832 void __user *buffer, size_t *lenp, loff_t *ppos)
2833{
2834 return -ENOSYS;
2835}
2836
d8217f07 2837int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2838 void __user *buffer, size_t *lenp, loff_t *ppos)
2839{
2840 return -ENOSYS;
2841}
2842
d8217f07 2843int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2844 void __user *buffer, size_t *lenp, loff_t *ppos)
2845{
2846 return -ENOSYS;
2847}
2848
d8217f07 2849int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2850 struct file *filp,
2851 void __user *buffer,
2852 size_t *lenp, loff_t *ppos)
2853{
2854 return -ENOSYS;
2855}
2856
2857
2858#endif /* CONFIG_PROC_FS */
2859
2860
b89a8171 2861#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2862/*
2863 * General sysctl support routines
2864 */
2865
49a0c458 2866/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2867int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2868 void __user *oldval, size_t __user *oldlenp,
2869 void __user *newval, size_t newlen)
2870{
2871 size_t len;
2872
2873 /* Get out of I don't have a variable */
2874 if (!table->data || !table->maxlen)
2875 return -ENOTDIR;
2876
2877 if (oldval && oldlenp) {
2878 if (get_user(len, oldlenp))
2879 return -EFAULT;
2880 if (len) {
2881 if (len > table->maxlen)
2882 len = table->maxlen;
2883 if (copy_to_user(oldval, table->data, len))
2884 return -EFAULT;
2885 if (put_user(len, oldlenp))
2886 return -EFAULT;
2887 }
2888 }
2889
2890 if (newval && newlen) {
2891 if (newlen > table->maxlen)
2892 newlen = table->maxlen;
2893
2894 if (copy_from_user(table->data, newval, newlen))
2895 return -EFAULT;
2896 }
2897 return 1;
2898}
2899
1da177e4 2900/* The generic string strategy routine: */
f221e726 2901int sysctl_string(struct ctl_table *table,
1da177e4 2902 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2903 void __user *newval, size_t newlen)
1da177e4 2904{
1da177e4
LT		 2905 if (!table->data || !table->maxlen)
2906 return -ENOTDIR;
2907
2908 if (oldval && oldlenp) {
de9e007d
LT		 2909 size_t bufsize;
2910 if (get_user(bufsize, oldlenp))
1da177e4 2911 return -EFAULT;
de9e007d
LT		 2912 if (bufsize) {
2913 size_t len = strlen(table->data), copied;
2914
2915 /* This shouldn't trigger for a well-formed sysctl */
2916 if (len > table->maxlen)
1da177e4 2917 len = table->maxlen;
de9e007d
LT		 2918
2919 /* Copy up to a max of bufsize-1 bytes of the string */
2920 copied = (len >= bufsize) ? bufsize - 1 : len;
2921
2922 if (copy_to_user(oldval, table->data, copied) ||
2923 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2924 return -EFAULT;
de9e007d 2925 if (put_user(len, oldlenp))
1da177e4
LT		 2926 return -EFAULT;
2927 }
2928 }
2929 if (newval && newlen) {
de9e007d 2930 size_t len = newlen;
1da177e4
LT		 2931 if (len > table->maxlen)
2932 len = table->maxlen;
2933 if(copy_from_user(table->data, newval, len))
2934 return -EFAULT;
2935 if (len == table->maxlen)
2936 len--;
2937 ((char *) table->data)[len] = 0;
2938 }
82c9df82 2939 return 1;
1da177e4
LT		 2940}
2941
2942/*
2943 * This function makes sure that all of the integers in the vector
2944 * are between the minimum and maximum values given in the arrays
2945 * table->extra1 and table->extra2, respectively.
2946 */
f221e726 2947int sysctl_intvec(struct ctl_table *table,
1da177e4 2948 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2949 void __user *newval, size_t newlen)
1da177e4
LT		 2950{
2951
2952 if (newval && newlen) {
2953 int __user *vec = (int __user *) newval;
2954 int *min = (int *) table->extra1;
2955 int *max = (int *) table->extra2;
2956 size_t length;
2957 int i;
2958
2959 if (newlen % sizeof(int) != 0)
2960 return -EINVAL;
2961
2962 if (!table->extra1 && !table->extra2)
2963 return 0;
2964
2965 if (newlen > table->maxlen)
2966 newlen = table->maxlen;
2967 length = newlen / sizeof(int);
2968
2969 for (i = 0; i < length; i++) {
2970 int value;
2971 if (get_user(value, vec + i))
2972 return -EFAULT;
2973 if (min && value < min[i])
2974 return -EINVAL;
2975 if (max && value > max[i])
2976 return -EINVAL;
2977 }
2978 }
2979 return 0;
2980}
2981
2982/* Strategy function to convert jiffies to seconds */
f221e726 2983int sysctl_jiffies(struct ctl_table *table,
1da177e4 2984 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2985 void __user *newval, size_t newlen)
1da177e4 2986{
3ee75ac3 2987 if (oldval && oldlenp) {
1da177e4 2988 size_t olen;
3ee75ac3
AD		 2989
2990 if (get_user(olen, oldlenp))
2991 return -EFAULT;
2992 if (olen) {
2993 int val;
2994
2995 if (olen < sizeof(int))
2996 return -EINVAL;
2997
2998 val = *(int *)(table->data) / HZ;
2999 if (put_user(val, (int __user *)oldval))
3000 return -EFAULT;
3001 if (put_user(sizeof(int), oldlenp))
1da177e4 3002 return -EFAULT;
1da177e4 3003 }
1da177e4
LT		 3004 }
3005 if (newval && newlen) {
3006 int new;
3007 if (newlen != sizeof(int))
3008 return -EINVAL;
3009 if (get_user(new, (int __user *)newval))
3010 return -EFAULT;
3011 *(int *)(table->data) = new*HZ;
3012 }
3013 return 1;
3014}
3015
3016/* Strategy function to convert jiffies to seconds */
f221e726 3017int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3018 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3019 void __user *newval, size_t newlen)
1da177e4 3020{
3ee75ac3 3021 if (oldval && oldlenp) {
1da177e4 3022 size_t olen;
3ee75ac3
AD		 3023
3024 if (get_user(olen, oldlenp))
3025 return -EFAULT;
3026 if (olen) {
3027 int val;
3028
3029 if (olen < sizeof(int))
3030 return -EINVAL;
3031
3032 val = jiffies_to_msecs(*(int *)(table->data));
3033 if (put_user(val, (int __user *)oldval))
3034 return -EFAULT;
3035 if (put_user(sizeof(int), oldlenp))
1da177e4 3036 return -EFAULT;
1da177e4 3037 }
1da177e4
LT		 3038 }
3039 if (newval && newlen) {
3040 int new;
3041 if (newlen != sizeof(int))
3042 return -EINVAL;
3043 if (get_user(new, (int __user *)newval))
3044 return -EFAULT;
3045 *(int *)(table->data) = msecs_to_jiffies(new);
3046 }
3047 return 1;
3048}
3049
c4b8b769 3050
c4b8b769 3051
b89a8171 3052#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3053
3054
1e7bfb21 3055SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3056{
0e009be8 3057 struct __sysctl_args tmp;
7058cb02 3058 int error;
0e009be8 3059
0e009be8
EB		 3060 if (copy_from_user(&tmp, args, sizeof(tmp)))
3061 return -EFAULT;
0e009be8 3062
7058cb02 3063 error = deprecated_sysctl_warning(&tmp);
b89a8171 3064
7058cb02
EB		 3065 /* If no error reading the parameters then just -ENOSYS ... */
3066 if (!error)
3067 error = -ENOSYS;
3068
3069 return error;
1da177e4
LT		 3070}
3071
f221e726 3072int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3073 void __user *oldval, size_t __user *oldlenp,
3074 void __user *newval, size_t newlen)
3075{
3076 return -ENOSYS;
3077}
3078
f221e726 3079int sysctl_string(struct ctl_table *table,
1da177e4 3080 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3081 void __user *newval, size_t newlen)
1da177e4
LT		 3082{
3083 return -ENOSYS;
3084}
3085
f221e726 3086int sysctl_intvec(struct ctl_table *table,
1da177e4 3087 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3088 void __user *newval, size_t newlen)
1da177e4
LT		 3089{
3090 return -ENOSYS;
3091}
3092
f221e726 3093int sysctl_jiffies(struct ctl_table *table,
1da177e4 3094 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3095 void __user *newval, size_t newlen)
1da177e4
LT		 3096{
3097 return -ENOSYS;
3098}
3099
f221e726 3100int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3101 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3102 void __user *newval, size_t newlen)
1da177e4
LT		 3103{
3104 return -ENOSYS;
3105}
3106
b89a8171 3107#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3108
7058cb02
EB		 3109static int deprecated_sysctl_warning(struct __sysctl_args *args)
3110{
3111 static int msg_count;
3112 int name[CTL_MAXNAME];
3113 int i;
3114
6fc48af8
TH		 3115 /* Check args->nlen. */
3116 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3117 return -ENOTDIR;
3118
7058cb02
EB		 3119 /* Read in the sysctl name for better debug message logging */
3120 for (i = 0; i < args->nlen; i++)
3121 if (get_user(name[i], args->name + i))
3122 return -EFAULT;
3123
3124 /* Ignore accesses to kernel.version */
3125 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3126 return 0;
3127
3128 if (msg_count < 5) {
3129 msg_count++;
3130 printk(KERN_INFO
3131 "warning: process `%s' used the deprecated sysctl "
3132 "system call with ", current->comm);
3133 for (i = 0; i < args->nlen; i++)
3134 printk("%d.", name[i]);
3135 printk("\n");
3136 }
3137 return 0;
3138}
3139
1da177e4
LT		 3140/*
3141 * No sense putting this after each symbol definition, twice,
3142 * exception granted :-)
3143 */
3144EXPORT_SYMBOL(proc_dointvec);
3145EXPORT_SYMBOL(proc_dointvec_jiffies);
3146EXPORT_SYMBOL(proc_dointvec_minmax);
3147EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3148EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3149EXPORT_SYMBOL(proc_dostring);
3150EXPORT_SYMBOL(proc_doulongvec_minmax);
3151EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3152EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3153EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3154EXPORT_SYMBOL(sysctl_intvec);
3155EXPORT_SYMBOL(sysctl_jiffies);
3156EXPORT_SYMBOL(sysctl_ms_jiffies);
3157EXPORT_SYMBOL(sysctl_string);
49a0c458 3158EXPORT_SYMBOL(sysctl_data);
1da177e4 3159EXPORT_SYMBOL(unregister_sysctl_table);
kernel source for telekom puls (alcatel/mediatek)