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[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / sysctl.c
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1da177e4
LT		 1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
1da177e4
LT		 21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
26#include <linux/proc_fs.h>
72c2d582 27#include <linux/security.h>
1da177e4
LT		 28#include <linux/ctype.h>
29#include <linux/utsname.h>
1da177e4 30#include <linux/smp_lock.h>
62239ac2 31#include <linux/fs.h>
1da177e4
LT		 32#include <linux/init.h>
33#include <linux/kernel.h>
0296b228 34#include <linux/kobject.h>
20380731 35#include <linux/net.h>
1da177e4
LT		 36#include <linux/sysrq.h>
37#include <linux/highuid.h>
38#include <linux/writeback.h>
39#include <linux/hugetlb.h>
40#include <linux/security.h>
41#include <linux/initrd.h>
42#include <linux/times.h>
43#include <linux/limits.h>
44#include <linux/dcache.h>
45#include <linux/syscalls.h>
c255d844
PM		 46#include <linux/nfs_fs.h>
47#include <linux/acpi.h>
10a0a8d4 48#include <linux/reboot.h>
1da177e4
LT		 49
50#include <asm/uaccess.h>
51#include <asm/processor.h>
52
29cbc78b
AK		 53#ifdef CONFIG_X86
54#include <asm/nmi.h>
0741f4d2 55#include <asm/stacktrace.h>
6e7c4025 56#include <asm/io.h>
29cbc78b
AK		 57#endif
58
7058cb02
EB		 59static int deprecated_sysctl_warning(struct __sysctl_args *args);
60
1da177e4
LT		 61#if defined(CONFIG_SYSCTL)
62
63/* External variables not in a header file. */
64extern int C_A_D;
45807a1d 65extern int print_fatal_signals;
1da177e4
LT		 66extern int sysctl_overcommit_memory;
67extern int sysctl_overcommit_ratio;
fadd8fbd 68extern int sysctl_panic_on_oom;
fe071d7e 69extern int sysctl_oom_kill_allocating_task;
1da177e4 70extern int max_threads;
1da177e4 71extern int core_uses_pid;
d6e71144 72extern int suid_dumpable;
1da177e4 73extern char core_pattern[];
1da177e4
LT		 74extern int pid_max;
75extern int min_free_kbytes;
76extern int printk_ratelimit_jiffies;
77extern int printk_ratelimit_burst;
78extern int pid_max_min, pid_max_max;
9d0243bc 79extern int sysctl_drop_caches;
8ad4b1fb 80extern int percpu_pagelist_fraction;
bebfa101 81extern int compat_log;
5096add8 82extern int maps_protect;
77461ab3 83extern int sysctl_stat_interval;
9745512c 84extern int latencytop_enabled;
1da177e4 85
c4f3b63f
RT		 86/* Constants used for minimum and maximum */
87#ifdef CONFIG_DETECT_SOFTLOCKUP
88static int one = 1;
89static int sixty = 60;
90#endif
91
92#ifdef CONFIG_MMU
93static int two = 2;
94#endif
95
96static int zero;
97static int one_hundred = 100;
98
1da177e4
LT		 99/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
100static int maxolduid = 65535;
101static int minolduid;
8ad4b1fb 102static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 103
104static int ngroups_max = NGROUPS_MAX;
105
106#ifdef CONFIG_KMOD
107extern char modprobe_path[];
108#endif
1da177e4
LT		 109#ifdef CONFIG_CHR_DEV_SG
110extern int sg_big_buff;
111#endif
1da177e4
LT		 112
113#ifdef __sparc__
114extern char reboot_command [];
115extern int stop_a_enabled;
116extern int scons_pwroff;
117#endif
118
119#ifdef __hppa__
120extern int pwrsw_enabled;
121extern int unaligned_enabled;
122#endif
123
347a8dc3 124#ifdef CONFIG_S390
1da177e4
LT		 125#ifdef CONFIG_MATHEMU
126extern int sysctl_ieee_emulation_warnings;
127#endif
128extern int sysctl_userprocess_debug;
951f22d5 129extern int spin_retry;
1da177e4
LT		 130#endif
131
132extern int sysctl_hz_timer;
133
134#ifdef CONFIG_BSD_PROCESS_ACCT
135extern int acct_parm[];
136#endif
137
d2b176ed
JS		 138#ifdef CONFIG_IA64
139extern int no_unaligned_warning;
140#endif
141
23f78d4a
IM		 142#ifdef CONFIG_RT_MUTEXES
143extern int max_lock_depth;
144#endif
145
b89a8171
EB		 146#ifdef CONFIG_SYSCTL_SYSCALL
147static int parse_table(int __user *, int, void __user *, size_t __user *,
d8217f07 148 void __user *, size_t, struct ctl_table *);
b89a8171
EB		 149#endif
150
6b49a257 151
d6f8ff73 152#ifdef CONFIG_PROC_SYSCTL
d8217f07 153static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 154 void __user *buffer, size_t *lenp, loff_t *ppos);
d8217f07 155static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 156 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 157#endif
9ec52099 158
d8217f07 159static struct ctl_table root_table[];
e51b6ba0
EB		 160static struct ctl_table_root sysctl_table_root;
161static struct ctl_table_header root_table_header = {
162 .ctl_table = root_table,
163 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
164 .root = &sysctl_table_root,
165};
166static struct ctl_table_root sysctl_table_root = {
167 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
168 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
169};
1da177e4 170
d8217f07
EB		 171static struct ctl_table kern_table[];
172static struct ctl_table vm_table[];
173static struct ctl_table fs_table[];
174static struct ctl_table debug_table[];
175static struct ctl_table dev_table[];
176extern struct ctl_table random_table[];
2d9048e2 177#ifdef CONFIG_INOTIFY_USER
d8217f07 178extern struct ctl_table inotify_table[];
0399cb08 179#endif
1da177e4
LT		 180
181#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
182int sysctl_legacy_va_layout;
183#endif
184
f20786ff
PZ		 185extern int prove_locking;
186extern int lock_stat;
9bc9a6bd 187
1da177e4
LT		 188/* The default sysctl tables: */
189
d8217f07 190static struct ctl_table root_table[] = {
1da177e4
LT		 191 {
192 .ctl_name = CTL_KERN,
193 .procname = "kernel",
194 .mode = 0555,
195 .child = kern_table,
196 },
197 {
198 .ctl_name = CTL_VM,
199 .procname = "vm",
200 .mode = 0555,
201 .child = vm_table,
202 },
1da177e4
LT		 203 {
204 .ctl_name = CTL_FS,
205 .procname = "fs",
206 .mode = 0555,
207 .child = fs_table,
208 },
209 {
210 .ctl_name = CTL_DEBUG,
211 .procname = "debug",
212 .mode = 0555,
213 .child = debug_table,
214 },
215 {
216 .ctl_name = CTL_DEV,
217 .procname = "dev",
218 .mode = 0555,
219 .child = dev_table,
220 },
2be7fe07
AM		 221/*
222 * NOTE: do not add new entries to this table unless you have read
223 * Documentation/sysctl/ctl_unnumbered.txt
224 */
1da177e4
LT		 225 { .ctl_name = 0 }
226};
227
77e54a1f 228#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 229static int min_sched_granularity_ns = 100000; /* 100 usecs */
230static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
231static int min_wakeup_granularity_ns; /* 0 usecs */
232static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 233#endif
234
d8217f07 235static struct ctl_table kern_table[] = {
77e54a1f
IM		 236#ifdef CONFIG_SCHED_DEBUG
237 {
238 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 239 .procname = "sched_min_granularity_ns",
240 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 241 .maxlen = sizeof(unsigned int),
242 .mode = 0644,
b2be5e96
PZ		 243 .proc_handler = &sched_nr_latency_handler,
244 .strategy = &sysctl_intvec,
245 .extra1 = &min_sched_granularity_ns,
246 .extra2 = &max_sched_granularity_ns,
77e54a1f 247 },
21805085
PZ		 248 {
249 .ctl_name = CTL_UNNUMBERED,
250 .procname = "sched_latency_ns",
251 .data = &sysctl_sched_latency,
252 .maxlen = sizeof(unsigned int),
253 .mode = 0644,
b2be5e96 254 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 255 .strategy = &sysctl_intvec,
256 .extra1 = &min_sched_granularity_ns,
257 .extra2 = &max_sched_granularity_ns,
258 },
77e54a1f
IM		 259 {
260 .ctl_name = CTL_UNNUMBERED,
261 .procname = "sched_wakeup_granularity_ns",
262 .data = &sysctl_sched_wakeup_granularity,
263 .maxlen = sizeof(unsigned int),
264 .mode = 0644,
265 .proc_handler = &proc_dointvec_minmax,
266 .strategy = &sysctl_intvec,
267 .extra1 = &min_wakeup_granularity_ns,
268 .extra2 = &max_wakeup_granularity_ns,
269 },
270 {
271 .ctl_name = CTL_UNNUMBERED,
272 .procname = "sched_batch_wakeup_granularity_ns",
273 .data = &sysctl_sched_batch_wakeup_granularity,
274 .maxlen = sizeof(unsigned int),
275 .mode = 0644,
276 .proc_handler = &proc_dointvec_minmax,
277 .strategy = &sysctl_intvec,
278 .extra1 = &min_wakeup_granularity_ns,
279 .extra2 = &max_wakeup_granularity_ns,
280 },
77e54a1f
IM		 281 {
282 .ctl_name = CTL_UNNUMBERED,
283 .procname = "sched_child_runs_first",
284 .data = &sysctl_sched_child_runs_first,
285 .maxlen = sizeof(unsigned int),
286 .mode = 0644,
287 .proc_handler = &proc_dointvec,
288 },
1fc84aaa
PZ		 289 {
290 .ctl_name = CTL_UNNUMBERED,
291 .procname = "sched_features",
292 .data = &sysctl_sched_features,
293 .maxlen = sizeof(unsigned int),
294 .mode = 0644,
295 .proc_handler = &proc_dointvec,
296 },
da84d961
IM		 297 {
298 .ctl_name = CTL_UNNUMBERED,
299 .procname = "sched_migration_cost",
300 .data = &sysctl_sched_migration_cost,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = &proc_dointvec,
304 },
b82d9fdd
PZ		 305 {
306 .ctl_name = CTL_UNNUMBERED,
307 .procname = "sched_nr_migrate",
308 .data = &sysctl_sched_nr_migrate,
309 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 310 .mode = 0644,
311 .proc_handler = &proc_dointvec,
312 },
313 {
314 .ctl_name = CTL_UNNUMBERED,
315 .procname = "sched_rt_period_ms",
316 .data = &sysctl_sched_rt_period,
317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
319 .proc_handler = &proc_dointvec,
320 },
321 {
322 .ctl_name = CTL_UNNUMBERED,
323 .procname = "sched_rt_ratio",
324 .data = &sysctl_sched_rt_ratio,
325 .maxlen = sizeof(unsigned int),
326 .mode = 0644,
b82d9fdd
PZ		 327 .proc_handler = &proc_dointvec,
328 },
6b2d7700
SV		 329#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
330 {
331 .ctl_name = CTL_UNNUMBERED,
332 .procname = "sched_min_bal_int_shares",
333 .data = &sysctl_sched_min_bal_int_shares,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = &proc_dointvec,
337 },
338 {
339 .ctl_name = CTL_UNNUMBERED,
340 .procname = "sched_max_bal_int_shares",
341 .data = &sysctl_sched_max_bal_int_shares,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
344 .proc_handler = &proc_dointvec,
345 },
346#endif
1fc84aaa 347#endif
1799e35d
IM		 348 {
349 .ctl_name = CTL_UNNUMBERED,
350 .procname = "sched_compat_yield",
351 .data = &sysctl_sched_compat_yield,
352 .maxlen = sizeof(unsigned int),
353 .mode = 0644,
354 .proc_handler = &proc_dointvec,
355 },
f20786ff
PZ		 356#ifdef CONFIG_PROVE_LOCKING
357 {
358 .ctl_name = CTL_UNNUMBERED,
359 .procname = "prove_locking",
360 .data = &prove_locking,
361 .maxlen = sizeof(int),
362 .mode = 0644,
363 .proc_handler = &proc_dointvec,
364 },
365#endif
366#ifdef CONFIG_LOCK_STAT
367 {
368 .ctl_name = CTL_UNNUMBERED,
369 .procname = "lock_stat",
370 .data = &lock_stat,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = &proc_dointvec,
374 },
77e54a1f 375#endif
1da177e4
LT		 376 {
377 .ctl_name = KERN_PANIC,
378 .procname = "panic",
379 .data = &panic_timeout,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = &proc_dointvec,
383 },
384 {
385 .ctl_name = KERN_CORE_USES_PID,
386 .procname = "core_uses_pid",
387 .data = &core_uses_pid,
388 .maxlen = sizeof(int),
389 .mode = 0644,
390 .proc_handler = &proc_dointvec,
391 },
392 {
393 .ctl_name = KERN_CORE_PATTERN,
394 .procname = "core_pattern",
395 .data = core_pattern,
71ce92f3 396 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 397 .mode = 0644,
398 .proc_handler = &proc_dostring,
399 .strategy = &sysctl_string,
400 },
34f5a398 401#ifdef CONFIG_PROC_SYSCTL
1da177e4 402 {
1da177e4
LT		 403 .procname = "tainted",
404 .data = &tainted,
405 .maxlen = sizeof(int),
34f5a398
TT		 406 .mode = 0644,
407 .proc_handler = &proc_dointvec_taint,
1da177e4 408 },
34f5a398 409#endif
9745512c
AV		 410#ifdef CONFIG_LATENCYTOP
411 {
412 .procname = "latencytop",
413 .data = &latencytop_enabled,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = &proc_dointvec,
417 },
418#endif
72c2d582 419#ifdef CONFIG_SECURITY_CAPABILITIES
1da177e4 420 {
1da177e4
LT		 421 .procname = "cap-bound",
422 .data = &cap_bset,
423 .maxlen = sizeof(kernel_cap_t),
424 .mode = 0600,
425 .proc_handler = &proc_dointvec_bset,
426 },
72c2d582 427#endif /* def CONFIG_SECURITY_CAPABILITIES */
1da177e4
LT		 428#ifdef CONFIG_BLK_DEV_INITRD
429 {
430 .ctl_name = KERN_REALROOTDEV,
431 .procname = "real-root-dev",
432 .data = &real_root_dev,
433 .maxlen = sizeof(int),
434 .mode = 0644,
435 .proc_handler = &proc_dointvec,
436 },
437#endif
45807a1d
IM		 438 {
439 .ctl_name = CTL_UNNUMBERED,
440 .procname = "print-fatal-signals",
441 .data = &print_fatal_signals,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = &proc_dointvec,
445 },
1da177e4
LT		 446#ifdef __sparc__
447 {
448 .ctl_name = KERN_SPARC_REBOOT,
449 .procname = "reboot-cmd",
450 .data = reboot_command,
451 .maxlen = 256,
452 .mode = 0644,
453 .proc_handler = &proc_dostring,
454 .strategy = &sysctl_string,
455 },
456 {
457 .ctl_name = KERN_SPARC_STOP_A,
458 .procname = "stop-a",
459 .data = &stop_a_enabled,
460 .maxlen = sizeof (int),
461 .mode = 0644,
462 .proc_handler = &proc_dointvec,
463 },
464 {
465 .ctl_name = KERN_SPARC_SCONS_PWROFF,
466 .procname = "scons-poweroff",
467 .data = &scons_pwroff,
468 .maxlen = sizeof (int),
469 .mode = 0644,
470 .proc_handler = &proc_dointvec,
471 },
472#endif
473#ifdef __hppa__
474 {
475 .ctl_name = KERN_HPPA_PWRSW,
476 .procname = "soft-power",
477 .data = &pwrsw_enabled,
478 .maxlen = sizeof (int),
479 .mode = 0644,
480 .proc_handler = &proc_dointvec,
481 },
482 {
483 .ctl_name = KERN_HPPA_UNALIGNED,
484 .procname = "unaligned-trap",
485 .data = &unaligned_enabled,
486 .maxlen = sizeof (int),
487 .mode = 0644,
488 .proc_handler = &proc_dointvec,
489 },
490#endif
491 {
492 .ctl_name = KERN_CTLALTDEL,
493 .procname = "ctrl-alt-del",
494 .data = &C_A_D,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = &proc_dointvec,
498 },
499 {
500 .ctl_name = KERN_PRINTK,
501 .procname = "printk",
502 .data = &console_loglevel,
503 .maxlen = 4*sizeof(int),
504 .mode = 0644,
505 .proc_handler = &proc_dointvec,
506 },
507#ifdef CONFIG_KMOD
508 {
509 .ctl_name = KERN_MODPROBE,
510 .procname = "modprobe",
511 .data = &modprobe_path,
512 .maxlen = KMOD_PATH_LEN,
513 .mode = 0644,
514 .proc_handler = &proc_dostring,
515 .strategy = &sysctl_string,
516 },
517#endif
57ae2508 518#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 519 {
520 .ctl_name = KERN_HOTPLUG,
521 .procname = "hotplug",
312c004d
KS		 522 .data = &uevent_helper,
523 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 524 .mode = 0644,
525 .proc_handler = &proc_dostring,
526 .strategy = &sysctl_string,
527 },
528#endif
529#ifdef CONFIG_CHR_DEV_SG
530 {
531 .ctl_name = KERN_SG_BIG_BUFF,
532 .procname = "sg-big-buff",
533 .data = &sg_big_buff,
534 .maxlen = sizeof (int),
535 .mode = 0444,
536 .proc_handler = &proc_dointvec,
537 },
538#endif
539#ifdef CONFIG_BSD_PROCESS_ACCT
540 {
541 .ctl_name = KERN_ACCT,
542 .procname = "acct",
543 .data = &acct_parm,
544 .maxlen = 3*sizeof(int),
545 .mode = 0644,
546 .proc_handler = &proc_dointvec,
547 },
548#endif
1da177e4
LT		 549#ifdef CONFIG_MAGIC_SYSRQ
550 {
551 .ctl_name = KERN_SYSRQ,
552 .procname = "sysrq",
5d6f647f 553 .data = &__sysrq_enabled,
1da177e4
LT		 554 .maxlen = sizeof (int),
555 .mode = 0644,
556 .proc_handler = &proc_dointvec,
557 },
558#endif
d6f8ff73 559#ifdef CONFIG_PROC_SYSCTL
1da177e4 560 {
1da177e4 561 .procname = "cad_pid",
9ec52099 562 .data = NULL,
1da177e4
LT		 563 .maxlen = sizeof (int),
564 .mode = 0600,
9ec52099 565 .proc_handler = &proc_do_cad_pid,
1da177e4 566 },
d6f8ff73 567#endif
1da177e4
LT		 568 {
569 .ctl_name = KERN_MAX_THREADS,
570 .procname = "threads-max",
571 .data = &max_threads,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = &proc_dointvec,
575 },
576 {
577 .ctl_name = KERN_RANDOM,
578 .procname = "random",
579 .mode = 0555,
580 .child = random_table,
581 },
1da177e4
LT		 582 {
583 .ctl_name = KERN_OVERFLOWUID,
584 .procname = "overflowuid",
585 .data = &overflowuid,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = &proc_dointvec_minmax,
589 .strategy = &sysctl_intvec,
590 .extra1 = &minolduid,
591 .extra2 = &maxolduid,
592 },
593 {
594 .ctl_name = KERN_OVERFLOWGID,
595 .procname = "overflowgid",
596 .data = &overflowgid,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = &proc_dointvec_minmax,
600 .strategy = &sysctl_intvec,
601 .extra1 = &minolduid,
602 .extra2 = &maxolduid,
603 },
347a8dc3 604#ifdef CONFIG_S390
1da177e4
LT		 605#ifdef CONFIG_MATHEMU
606 {
607 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
608 .procname = "ieee_emulation_warnings",
609 .data = &sysctl_ieee_emulation_warnings,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = &proc_dointvec,
613 },
614#endif
615#ifdef CONFIG_NO_IDLE_HZ
616 {
617 .ctl_name = KERN_HZ_TIMER,
618 .procname = "hz_timer",
619 .data = &sysctl_hz_timer,
620 .maxlen = sizeof(int),
621 .mode = 0644,
622 .proc_handler = &proc_dointvec,
623 },
624#endif
625 {
626 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
627 .procname = "userprocess_debug",
628 .data = &sysctl_userprocess_debug,
629 .maxlen = sizeof(int),
630 .mode = 0644,
631 .proc_handler = &proc_dointvec,
632 },
633#endif
634 {
635 .ctl_name = KERN_PIDMAX,
636 .procname = "pid_max",
637 .data = &pid_max,
638 .maxlen = sizeof (int),
639 .mode = 0644,
640 .proc_handler = &proc_dointvec_minmax,
641 .strategy = sysctl_intvec,
642 .extra1 = &pid_max_min,
643 .extra2 = &pid_max_max,
644 },
645 {
646 .ctl_name = KERN_PANIC_ON_OOPS,
647 .procname = "panic_on_oops",
648 .data = &panic_on_oops,
649 .maxlen = sizeof(int),
650 .mode = 0644,
651 .proc_handler = &proc_dointvec,
652 },
653 {
654 .ctl_name = KERN_PRINTK_RATELIMIT,
655 .procname = "printk_ratelimit",
656 .data = &printk_ratelimit_jiffies,
657 .maxlen = sizeof(int),
658 .mode = 0644,
659 .proc_handler = &proc_dointvec_jiffies,
660 .strategy = &sysctl_jiffies,
661 },
662 {
663 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
664 .procname = "printk_ratelimit_burst",
665 .data = &printk_ratelimit_burst,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = &proc_dointvec,
669 },
670 {
671 .ctl_name = KERN_NGROUPS_MAX,
672 .procname = "ngroups_max",
673 .data = &ngroups_max,
674 .maxlen = sizeof (int),
675 .mode = 0444,
676 .proc_handler = &proc_dointvec,
677 },
678#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
679 {
680 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
681 .procname = "unknown_nmi_panic",
682 .data = &unknown_nmi_panic,
683 .maxlen = sizeof (int),
684 .mode = 0644,
2fbe7b25 685 .proc_handler = &proc_dointvec,
1da177e4 686 },
407984f1 687 {
407984f1
DZ		 688 .procname = "nmi_watchdog",
689 .data = &nmi_watchdog_enabled,
690 .maxlen = sizeof (int),
691 .mode = 0644,
692 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 693 },
694#endif
695#if defined(CONFIG_X86)
8da5adda
DZ		 696 {
697 .ctl_name = KERN_PANIC_ON_NMI,
698 .procname = "panic_on_unrecovered_nmi",
699 .data = &panic_on_unrecovered_nmi,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 .proc_handler = &proc_dointvec,
703 },
1da177e4
LT		 704 {
705 .ctl_name = KERN_BOOTLOADER_TYPE,
706 .procname = "bootloader_type",
707 .data = &bootloader_type,
708 .maxlen = sizeof (int),
709 .mode = 0444,
710 .proc_handler = &proc_dointvec,
711 },
0741f4d2
CE		 712 {
713 .ctl_name = CTL_UNNUMBERED,
714 .procname = "kstack_depth_to_print",
715 .data = &kstack_depth_to_print,
716 .maxlen = sizeof(int),
717 .mode = 0644,
718 .proc_handler = &proc_dointvec,
719 },
6e7c4025
IM		 720 {
721 .ctl_name = CTL_UNNUMBERED,
722 .procname = "io_delay_type",
723 .data = &io_delay_type,
724 .maxlen = sizeof(int),
725 .mode = 0644,
726 .proc_handler = &proc_dointvec,
727 },
1da177e4 728#endif
7a9166e3 729#if defined(CONFIG_MMU)
1da177e4
LT		 730 {
731 .ctl_name = KERN_RANDOMIZE,
732 .procname = "randomize_va_space",
733 .data = &randomize_va_space,
734 .maxlen = sizeof(int),
735 .mode = 0644,
736 .proc_handler = &proc_dointvec,
737 },
7a9166e3 738#endif
0152fb37 739#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 740 {
741 .ctl_name = KERN_SPIN_RETRY,
742 .procname = "spin_retry",
743 .data = &spin_retry,
744 .maxlen = sizeof (int),
745 .mode = 0644,
746 .proc_handler = &proc_dointvec,
747 },
c255d844 748#endif
673d5b43 749#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 750 {
c255d844 751 .procname = "acpi_video_flags",
77afcf78 752 .data = &acpi_realmode_flags,
c255d844
PM		 753 .maxlen = sizeof (unsigned long),
754 .mode = 0644,
7f99f06f 755 .proc_handler = &proc_doulongvec_minmax,
c255d844 756 },
d2b176ed
JS		 757#endif
758#ifdef CONFIG_IA64
759 {
760 .ctl_name = KERN_IA64_UNALIGNED,
761 .procname = "ignore-unaligned-usertrap",
762 .data = &no_unaligned_warning,
763 .maxlen = sizeof (int),
764 .mode = 0644,
765 .proc_handler = &proc_dointvec,
766 },
bebfa101 767#endif
c4f3b63f
RT		 768#ifdef CONFIG_DETECT_SOFTLOCKUP
769 {
770 .ctl_name = CTL_UNNUMBERED,
771 .procname = "softlockup_thresh",
772 .data = &softlockup_thresh,
90739081 773 .maxlen = sizeof(unsigned long),
c4f3b63f 774 .mode = 0644,
90739081 775 .proc_handler = &proc_doulongvec_minmax,
c4f3b63f
RT		 776 .strategy = &sysctl_intvec,
777 .extra1 = &one,
778 .extra2 = &sixty,
779 },
82a1fcb9
IM		 780 {
781 .ctl_name = CTL_UNNUMBERED,
782 .procname = "hung_task_check_count",
783 .data = &sysctl_hung_task_check_count,
90739081 784 .maxlen = sizeof(unsigned long),
82a1fcb9 785 .mode = 0644,
90739081 786 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 787 .strategy = &sysctl_intvec,
788 },
789 {
790 .ctl_name = CTL_UNNUMBERED,
791 .procname = "hung_task_timeout_secs",
792 .data = &sysctl_hung_task_timeout_secs,
90739081 793 .maxlen = sizeof(unsigned long),
82a1fcb9 794 .mode = 0644,
90739081 795 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 796 .strategy = &sysctl_intvec,
797 },
798 {
799 .ctl_name = CTL_UNNUMBERED,
800 .procname = "hung_task_warnings",
801 .data = &sysctl_hung_task_warnings,
90739081 802 .maxlen = sizeof(unsigned long),
82a1fcb9 803 .mode = 0644,
90739081 804 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 805 .strategy = &sysctl_intvec,
806 },
c4f3b63f 807#endif
bebfa101
AK		 808#ifdef CONFIG_COMPAT
809 {
810 .ctl_name = KERN_COMPAT_LOG,
811 .procname = "compat-log",
812 .data = &compat_log,
813 .maxlen = sizeof (int),
814 .mode = 0644,
815 .proc_handler = &proc_dointvec,
816 },
951f22d5 817#endif
23f78d4a
IM		 818#ifdef CONFIG_RT_MUTEXES
819 {
820 .ctl_name = KERN_MAX_LOCK_DEPTH,
821 .procname = "max_lock_depth",
822 .data = &max_lock_depth,
823 .maxlen = sizeof(int),
824 .mode = 0644,
825 .proc_handler = &proc_dointvec,
826 },
827#endif
5096add8
KC		 828#ifdef CONFIG_PROC_FS
829 {
830 .ctl_name = CTL_UNNUMBERED,
831 .procname = "maps_protect",
832 .data = &maps_protect,
833 .maxlen = sizeof(int),
834 .mode = 0644,
835 .proc_handler = &proc_dointvec,
836 },
837#endif
10a0a8d4
JF		 838 {
839 .ctl_name = CTL_UNNUMBERED,
840 .procname = "poweroff_cmd",
841 .data = &poweroff_cmd,
842 .maxlen = POWEROFF_CMD_PATH_LEN,
843 .mode = 0644,
844 .proc_handler = &proc_dostring,
845 .strategy = &sysctl_string,
846 },
ed2c12f3
AM		 847/*
848 * NOTE: do not add new entries to this table unless you have read
849 * Documentation/sysctl/ctl_unnumbered.txt
850 */
1da177e4
LT		 851 { .ctl_name = 0 }
852};
853
d8217f07 854static struct ctl_table vm_table[] = {
1da177e4
LT		 855 {
856 .ctl_name = VM_OVERCOMMIT_MEMORY,
857 .procname = "overcommit_memory",
858 .data = &sysctl_overcommit_memory,
859 .maxlen = sizeof(sysctl_overcommit_memory),
860 .mode = 0644,
861 .proc_handler = &proc_dointvec,
862 },
fadd8fbd
KH		 863 {
864 .ctl_name = VM_PANIC_ON_OOM,
865 .procname = "panic_on_oom",
866 .data = &sysctl_panic_on_oom,
867 .maxlen = sizeof(sysctl_panic_on_oom),
868 .mode = 0644,
869 .proc_handler = &proc_dointvec,
870 },
fe071d7e
DR		 871 {
872 .ctl_name = CTL_UNNUMBERED,
873 .procname = "oom_kill_allocating_task",
874 .data = &sysctl_oom_kill_allocating_task,
875 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
876 .mode = 0644,
877 .proc_handler = &proc_dointvec,
878 },
1da177e4
LT		 879 {
880 .ctl_name = VM_OVERCOMMIT_RATIO,
881 .procname = "overcommit_ratio",
882 .data = &sysctl_overcommit_ratio,
883 .maxlen = sizeof(sysctl_overcommit_ratio),
884 .mode = 0644,
885 .proc_handler = &proc_dointvec,
886 },
887 {
888 .ctl_name = VM_PAGE_CLUSTER,
889 .procname = "page-cluster",
890 .data = &page_cluster,
891 .maxlen = sizeof(int),
892 .mode = 0644,
893 .proc_handler = &proc_dointvec,
894 },
895 {
896 .ctl_name = VM_DIRTY_BACKGROUND,
897 .procname = "dirty_background_ratio",
898 .data = &dirty_background_ratio,
899 .maxlen = sizeof(dirty_background_ratio),
900 .mode = 0644,
901 .proc_handler = &proc_dointvec_minmax,
902 .strategy = &sysctl_intvec,
903 .extra1 = &zero,
904 .extra2 = &one_hundred,
905 },
906 {
907 .ctl_name = VM_DIRTY_RATIO,
908 .procname = "dirty_ratio",
909 .data = &vm_dirty_ratio,
910 .maxlen = sizeof(vm_dirty_ratio),
911 .mode = 0644,
04fbfdc1 912 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 913 .strategy = &sysctl_intvec,
914 .extra1 = &zero,
915 .extra2 = &one_hundred,
916 },
917 {
1da177e4 918 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 919 .data = &dirty_writeback_interval,
920 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 921 .mode = 0644,
922 .proc_handler = &dirty_writeback_centisecs_handler,
923 },
924 {
1da177e4 925 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 926 .data = &dirty_expire_interval,
927 .maxlen = sizeof(dirty_expire_interval),
1da177e4 928 .mode = 0644,
f6ef9438 929 .proc_handler = &proc_dointvec_userhz_jiffies,
1da177e4
LT		 930 },
931 {
932 .ctl_name = VM_NR_PDFLUSH_THREADS,
933 .procname = "nr_pdflush_threads",
934 .data = &nr_pdflush_threads,
935 .maxlen = sizeof nr_pdflush_threads,
936 .mode = 0444 /* read-only*/,
937 .proc_handler = &proc_dointvec,
938 },
939 {
940 .ctl_name = VM_SWAPPINESS,
941 .procname = "swappiness",
942 .data = &vm_swappiness,
943 .maxlen = sizeof(vm_swappiness),
944 .mode = 0644,
945 .proc_handler = &proc_dointvec_minmax,
946 .strategy = &sysctl_intvec,
947 .extra1 = &zero,
948 .extra2 = &one_hundred,
949 },
950#ifdef CONFIG_HUGETLB_PAGE
951 {
1da177e4
LT		 952 .procname = "nr_hugepages",
953 .data = &max_huge_pages,
954 .maxlen = sizeof(unsigned long),
955 .mode = 0644,
956 .proc_handler = &hugetlb_sysctl_handler,
957 .extra1 = (void *)&hugetlb_zero,
958 .extra2 = (void *)&hugetlb_infinity,
959 },
960 {
961 .ctl_name = VM_HUGETLB_GROUP,
962 .procname = "hugetlb_shm_group",
963 .data = &sysctl_hugetlb_shm_group,
964 .maxlen = sizeof(gid_t),
965 .mode = 0644,
966 .proc_handler = &proc_dointvec,
967 },
396faf03
MG		 968 {
969 .ctl_name = CTL_UNNUMBERED,
970 .procname = "hugepages_treat_as_movable",
971 .data = &hugepages_treat_as_movable,
972 .maxlen = sizeof(int),
973 .mode = 0644,
974 .proc_handler = &hugetlb_treat_movable_handler,
975 },
d1c3fb1f
NA		 976 {
977 .ctl_name = CTL_UNNUMBERED,
978 .procname = "nr_overcommit_hugepages",
979 .data = &nr_overcommit_huge_pages,
980 .maxlen = sizeof(nr_overcommit_huge_pages),
981 .mode = 0644,
982 .proc_handler = &proc_doulongvec_minmax,
983 },
1da177e4
LT		 984#endif
985 {
986 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
987 .procname = "lowmem_reserve_ratio",
988 .data = &sysctl_lowmem_reserve_ratio,
989 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
990 .mode = 0644,
991 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
992 .strategy = &sysctl_intvec,
993 },
9d0243bc
AM		 994 {
995 .ctl_name = VM_DROP_PAGECACHE,
996 .procname = "drop_caches",
997 .data = &sysctl_drop_caches,
998 .maxlen = sizeof(int),
999 .mode = 0644,
1000 .proc_handler = drop_caches_sysctl_handler,
1001 .strategy = &sysctl_intvec,
1002 },
1da177e4
LT		 1003 {
1004 .ctl_name = VM_MIN_FREE_KBYTES,
1005 .procname = "min_free_kbytes",
1006 .data = &min_free_kbytes,
1007 .maxlen = sizeof(min_free_kbytes),
1008 .mode = 0644,
1009 .proc_handler = &min_free_kbytes_sysctl_handler,
1010 .strategy = &sysctl_intvec,
1011 .extra1 = &zero,
1012 },
8ad4b1fb
RS		 1013 {
1014 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1015 .procname = "percpu_pagelist_fraction",
1016 .data = &percpu_pagelist_fraction,
1017 .maxlen = sizeof(percpu_pagelist_fraction),
1018 .mode = 0644,
1019 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1020 .strategy = &sysctl_intvec,
1021 .extra1 = &min_percpu_pagelist_fract,
1022 },
1da177e4
LT		 1023#ifdef CONFIG_MMU
1024 {
1025 .ctl_name = VM_MAX_MAP_COUNT,
1026 .procname = "max_map_count",
1027 .data = &sysctl_max_map_count,
1028 .maxlen = sizeof(sysctl_max_map_count),
1029 .mode = 0644,
1030 .proc_handler = &proc_dointvec
1031 },
1032#endif
1033 {
1034 .ctl_name = VM_LAPTOP_MODE,
1035 .procname = "laptop_mode",
1036 .data = &laptop_mode,
1037 .maxlen = sizeof(laptop_mode),
1038 .mode = 0644,
ed5b43f1
BS		 1039 .proc_handler = &proc_dointvec_jiffies,
1040 .strategy = &sysctl_jiffies,
1da177e4
LT		 1041 },
1042 {
1043 .ctl_name = VM_BLOCK_DUMP,
1044 .procname = "block_dump",
1045 .data = &block_dump,
1046 .maxlen = sizeof(block_dump),
1047 .mode = 0644,
1048 .proc_handler = &proc_dointvec,
1049 .strategy = &sysctl_intvec,
1050 .extra1 = &zero,
1051 },
1052 {
1053 .ctl_name = VM_VFS_CACHE_PRESSURE,
1054 .procname = "vfs_cache_pressure",
1055 .data = &sysctl_vfs_cache_pressure,
1056 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1057 .mode = 0644,
1058 .proc_handler = &proc_dointvec,
1059 .strategy = &sysctl_intvec,
1060 .extra1 = &zero,
1061 },
1062#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1063 {
1064 .ctl_name = VM_LEGACY_VA_LAYOUT,
1065 .procname = "legacy_va_layout",
1066 .data = &sysctl_legacy_va_layout,
1067 .maxlen = sizeof(sysctl_legacy_va_layout),
1068 .mode = 0644,
1069 .proc_handler = &proc_dointvec,
1070 .strategy = &sysctl_intvec,
1071 .extra1 = &zero,
1072 },
1073#endif
1743660b
CL		 1074#ifdef CONFIG_NUMA
1075 {
1076 .ctl_name = VM_ZONE_RECLAIM_MODE,
1077 .procname = "zone_reclaim_mode",
1078 .data = &zone_reclaim_mode,
1079 .maxlen = sizeof(zone_reclaim_mode),
1080 .mode = 0644,
1081 .proc_handler = &proc_dointvec,
c84db23c
CL		 1082 .strategy = &sysctl_intvec,
1083 .extra1 = &zero,
1743660b 1084 },
9614634f
CL		 1085 {
1086 .ctl_name = VM_MIN_UNMAPPED,
1087 .procname = "min_unmapped_ratio",
1088 .data = &sysctl_min_unmapped_ratio,
1089 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1090 .mode = 0644,
1091 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1092 .strategy = &sysctl_intvec,
1093 .extra1 = &zero,
1094 .extra2 = &one_hundred,
1095 },
0ff38490
CL		 1096 {
1097 .ctl_name = VM_MIN_SLAB,
1098 .procname = "min_slab_ratio",
1099 .data = &sysctl_min_slab_ratio,
1100 .maxlen = sizeof(sysctl_min_slab_ratio),
1101 .mode = 0644,
1102 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1103 .strategy = &sysctl_intvec,
1104 .extra1 = &zero,
1105 .extra2 = &one_hundred,
1106 },
e6e5494c 1107#endif
77461ab3
CL		 1108#ifdef CONFIG_SMP
1109 {
1110 .ctl_name = CTL_UNNUMBERED,
1111 .procname = "stat_interval",
1112 .data = &sysctl_stat_interval,
1113 .maxlen = sizeof(sysctl_stat_interval),
1114 .mode = 0644,
1115 .proc_handler = &proc_dointvec_jiffies,
1116 .strategy = &sysctl_jiffies,
1117 },
1118#endif
ed032189
EP		 1119#ifdef CONFIG_SECURITY
1120 {
1121 .ctl_name = CTL_UNNUMBERED,
1122 .procname = "mmap_min_addr",
1123 .data = &mmap_min_addr,
1124 .maxlen = sizeof(unsigned long),
1125 .mode = 0644,
1126 .proc_handler = &proc_doulongvec_minmax,
1127 },
8daec965 1128#endif
f0c0b2b8
KH		 1129#ifdef CONFIG_NUMA
1130 {
1131 .ctl_name = CTL_UNNUMBERED,
1132 .procname = "numa_zonelist_order",
1133 .data = &numa_zonelist_order,
1134 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1135 .mode = 0644,
1136 .proc_handler = &numa_zonelist_order_handler,
1137 .strategy = &sysctl_string,
1138 },
1139#endif
2b8232ce 1140#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1141 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1142 {
1143 .ctl_name = VM_VDSO_ENABLED,
1144 .procname = "vdso_enabled",
1145 .data = &vdso_enabled,
1146 .maxlen = sizeof(vdso_enabled),
1147 .mode = 0644,
1148 .proc_handler = &proc_dointvec,
1149 .strategy = &sysctl_intvec,
1150 .extra1 = &zero,
1151 },
1da177e4 1152#endif
2be7fe07
AM		 1153/*
1154 * NOTE: do not add new entries to this table unless you have read
1155 * Documentation/sysctl/ctl_unnumbered.txt
1156 */
1da177e4
LT		 1157 { .ctl_name = 0 }
1158};
1159
2abc26fc 1160#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1161static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1162 { .ctl_name = 0 }
1163};
1164#endif
1165
d8217f07 1166static struct ctl_table fs_table[] = {
1da177e4
LT		 1167 {
1168 .ctl_name = FS_NRINODE,
1169 .procname = "inode-nr",
1170 .data = &inodes_stat,
1171 .maxlen = 2*sizeof(int),
1172 .mode = 0444,
1173 .proc_handler = &proc_dointvec,
1174 },
1175 {
1176 .ctl_name = FS_STATINODE,
1177 .procname = "inode-state",
1178 .data = &inodes_stat,
1179 .maxlen = 7*sizeof(int),
1180 .mode = 0444,
1181 .proc_handler = &proc_dointvec,
1182 },
1183 {
1da177e4
LT		 1184 .procname = "file-nr",
1185 .data = &files_stat,
1186 .maxlen = 3*sizeof(int),
1187 .mode = 0444,
529bf6be 1188 .proc_handler = &proc_nr_files,
1da177e4
LT		 1189 },
1190 {
1191 .ctl_name = FS_MAXFILE,
1192 .procname = "file-max",
1193 .data = &files_stat.max_files,
1194 .maxlen = sizeof(int),
1195 .mode = 0644,
1196 .proc_handler = &proc_dointvec,
1197 },
1198 {
1199 .ctl_name = FS_DENTRY,
1200 .procname = "dentry-state",
1201 .data = &dentry_stat,
1202 .maxlen = 6*sizeof(int),
1203 .mode = 0444,
1204 .proc_handler = &proc_dointvec,
1205 },
1206 {
1207 .ctl_name = FS_OVERFLOWUID,
1208 .procname = "overflowuid",
1209 .data = &fs_overflowuid,
1210 .maxlen = sizeof(int),
1211 .mode = 0644,
1212 .proc_handler = &proc_dointvec_minmax,
1213 .strategy = &sysctl_intvec,
1214 .extra1 = &minolduid,
1215 .extra2 = &maxolduid,
1216 },
1217 {
1218 .ctl_name = FS_OVERFLOWGID,
1219 .procname = "overflowgid",
1220 .data = &fs_overflowgid,
1221 .maxlen = sizeof(int),
1222 .mode = 0644,
1223 .proc_handler = &proc_dointvec_minmax,
1224 .strategy = &sysctl_intvec,
1225 .extra1 = &minolduid,
1226 .extra2 = &maxolduid,
1227 },
1228 {
1229 .ctl_name = FS_LEASES,
1230 .procname = "leases-enable",
1231 .data = &leases_enable,
1232 .maxlen = sizeof(int),
1233 .mode = 0644,
1234 .proc_handler = &proc_dointvec,
1235 },
1236#ifdef CONFIG_DNOTIFY
1237 {
1238 .ctl_name = FS_DIR_NOTIFY,
1239 .procname = "dir-notify-enable",
1240 .data = &dir_notify_enable,
1241 .maxlen = sizeof(int),
1242 .mode = 0644,
1243 .proc_handler = &proc_dointvec,
1244 },
1245#endif
1246#ifdef CONFIG_MMU
1247 {
1248 .ctl_name = FS_LEASE_TIME,
1249 .procname = "lease-break-time",
1250 .data = &lease_break_time,
1251 .maxlen = sizeof(int),
1252 .mode = 0644,
76fdbb25
KH		 1253 .proc_handler = &proc_dointvec_minmax,
1254 .strategy = &sysctl_intvec,
1255 .extra1 = &zero,
1256 .extra2 = &two,
1da177e4
LT		 1257 },
1258 {
1da177e4
LT		 1259 .procname = "aio-nr",
1260 .data = &aio_nr,
1261 .maxlen = sizeof(aio_nr),
1262 .mode = 0444,
d55b5fda 1263 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1264 },
1265 {
1da177e4
LT		 1266 .procname = "aio-max-nr",
1267 .data = &aio_max_nr,
1268 .maxlen = sizeof(aio_max_nr),
1269 .mode = 0644,
d55b5fda 1270 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1271 },
2d9048e2 1272#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1273 {
1274 .ctl_name = FS_INOTIFY,
1275 .procname = "inotify",
1276 .mode = 0555,
1277 .child = inotify_table,
1278 },
1279#endif
1da177e4 1280#endif
d6e71144
AC		 1281 {
1282 .ctl_name = KERN_SETUID_DUMPABLE,
1283 .procname = "suid_dumpable",
1284 .data = &suid_dumpable,
1285 .maxlen = sizeof(int),
1286 .mode = 0644,
1287 .proc_handler = &proc_dointvec,
1288 },
2abc26fc
EB		 1289#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1290 {
1291 .ctl_name = CTL_UNNUMBERED,
1292 .procname = "binfmt_misc",
1293 .mode = 0555,
1294 .child = binfmt_misc_table,
1295 },
1296#endif
2be7fe07
AM		 1297/*
1298 * NOTE: do not add new entries to this table unless you have read
1299 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1300 */
1da177e4
LT		 1301 { .ctl_name = 0 }
1302};
1303
d8217f07 1304static struct ctl_table debug_table[] = {
d0c3d534 1305#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1306 {
1307 .ctl_name = CTL_UNNUMBERED,
1308 .procname = "exception-trace",
1309 .data = &show_unhandled_signals,
1310 .maxlen = sizeof(int),
1311 .mode = 0644,
1312 .proc_handler = proc_dointvec
1313 },
1314#endif
1da177e4
LT		 1315 { .ctl_name = 0 }
1316};
1317
d8217f07 1318static struct ctl_table dev_table[] = {
1da177e4 1319 { .ctl_name = 0 }
0eeca283 1320};
1da177e4 1321
330d57fb
AV		 1322static DEFINE_SPINLOCK(sysctl_lock);
1323
1324/* called under sysctl_lock */
1325static int use_table(struct ctl_table_header *p)
1326{
1327 if (unlikely(p->unregistering))
1328 return 0;
1329 p->used++;
1330 return 1;
1331}
1332
1333/* called under sysctl_lock */
1334static void unuse_table(struct ctl_table_header *p)
1335{
1336 if (!--p->used)
1337 if (unlikely(p->unregistering))
1338 complete(p->unregistering);
1339}
1340
1341/* called under sysctl_lock, will reacquire if has to wait */
1342static void start_unregistering(struct ctl_table_header *p)
1343{
1344 /*
1345 * if p->used is 0, nobody will ever touch that entry again;
1346 * we'll eliminate all paths to it before dropping sysctl_lock
1347 */
1348 if (unlikely(p->used)) {
1349 struct completion wait;
1350 init_completion(&wait);
1351 p->unregistering = &wait;
1352 spin_unlock(&sysctl_lock);
1353 wait_for_completion(&wait);
1354 spin_lock(&sysctl_lock);
1355 }
1356 /*
1357 * do not remove from the list until nobody holds it; walking the
1358 * list in do_sysctl() relies on that.
1359 */
1360 list_del_init(&p->ctl_entry);
1361}
1362
805b5d5e
EB		 1363void sysctl_head_finish(struct ctl_table_header *head)
1364{
1365 if (!head)
1366 return;
1367 spin_lock(&sysctl_lock);
1368 unuse_table(head);
1369 spin_unlock(&sysctl_lock);
1370}
1371
e51b6ba0
EB		 1372static struct list_head *
1373lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1374{
e51b6ba0
EB		 1375 struct list_head *header_list;
1376 header_list = &root->header_list;
1377 if (root->lookup)
1378 header_list = root->lookup(root, namespaces);
1379 return header_list;
1380}
1381
1382struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1383 struct ctl_table_header *prev)
1384{
1385 struct ctl_table_root *root;
1386 struct list_head *header_list;
805b5d5e
EB		 1387 struct ctl_table_header *head;
1388 struct list_head *tmp;
e51b6ba0 1389
805b5d5e
EB		 1390 spin_lock(&sysctl_lock);
1391 if (prev) {
e51b6ba0 1392 head = prev;
805b5d5e
EB		 1393 tmp = &prev->ctl_entry;
1394 unuse_table(prev);
1395 goto next;
1396 }
1397 tmp = &root_table_header.ctl_entry;
1398 for (;;) {
1399 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1400
1401 if (!use_table(head))
1402 goto next;
1403 spin_unlock(&sysctl_lock);
1404 return head;
1405 next:
e51b6ba0 1406 root = head->root;
805b5d5e 1407 tmp = tmp->next;
e51b6ba0
EB		 1408 header_list = lookup_header_list(root, namespaces);
1409 if (tmp != header_list)
1410 continue;
1411
1412 do {
1413 root = list_entry(root->root_list.next,
1414 struct ctl_table_root, root_list);
1415 if (root == &sysctl_table_root)
1416 goto out;
1417 header_list = lookup_header_list(root, namespaces);
1418 } while (list_empty(header_list));
1419 tmp = header_list->next;
805b5d5e 1420 }
e51b6ba0 1421out:
805b5d5e
EB		 1422 spin_unlock(&sysctl_lock);
1423 return NULL;
1424}
1425
e51b6ba0
EB		 1426struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1427{
1428 return __sysctl_head_next(current->nsproxy, prev);
1429}
1430
1431void register_sysctl_root(struct ctl_table_root *root)
1432{
1433 spin_lock(&sysctl_lock);
1434 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1435 spin_unlock(&sysctl_lock);
1436}
1437
b89a8171 1438#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 1439int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1440 void __user *newval, size_t newlen)
1441{
805b5d5e 1442 struct ctl_table_header *head;
330d57fb 1443 int error = -ENOTDIR;
1da177e4
LT		 1444
1445 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1446 return -ENOTDIR;
1447 if (oldval) {
1448 int old_len;
1449 if (!oldlenp || get_user(old_len, oldlenp))
1450 return -EFAULT;
1451 }
330d57fb 1452
805b5d5e
EB		 1453 for (head = sysctl_head_next(NULL); head;
1454 head = sysctl_head_next(head)) {
330d57fb 1455 error = parse_table(name, nlen, oldval, oldlenp,
1f29bcd7 1456 newval, newlen, head->ctl_table);
805b5d5e
EB		 1457 if (error != -ENOTDIR) {
1458 sysctl_head_finish(head);
330d57fb 1459 break;
805b5d5e
EB		 1460 }
1461 }
330d57fb 1462 return error;
1da177e4
LT		 1463}
1464
1465asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1466{
1467 struct __sysctl_args tmp;
1468 int error;
1469
1470 if (copy_from_user(&tmp, args, sizeof(tmp)))
1471 return -EFAULT;
1472
7058cb02
EB		 1473 error = deprecated_sysctl_warning(&tmp);
1474 if (error)
1475 goto out;
1476
1da177e4
LT		 1477 lock_kernel();
1478 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1479 tmp.newval, tmp.newlen);
1480 unlock_kernel();
7058cb02 1481out:
1da177e4
LT		 1482 return error;
1483}
b89a8171 1484#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1485
1486/*
1ff007eb 1487 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1488 * some sysctl variables are readonly even to root.
1489 */
1490
1491static int test_perm(int mode, int op)
1492{
1493 if (!current->euid)
1494 mode >>= 6;
1495 else if (in_egroup_p(0))
1496 mode >>= 3;
1497 if ((mode & op & 0007) == op)
1498 return 0;
1499 return -EACCES;
1500}
1501
d8217f07 1502int sysctl_perm(struct ctl_table *table, int op)
1da177e4
LT		 1503{
1504 int error;
1505 error = security_sysctl(table, op);
1506 if (error)
1507 return error;
1508 return test_perm(table->mode, op);
1509}
1510
b89a8171 1511#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 1512static int parse_table(int __user *name, int nlen,
1513 void __user *oldval, size_t __user *oldlenp,
1514 void __user *newval, size_t newlen,
d8217f07 1515 struct ctl_table *table)
1da177e4
LT		 1516{
1517 int n;
1518repeat:
1519 if (!nlen)
1520 return -ENOTDIR;
1521 if (get_user(n, name))
1522 return -EFAULT;
d99f160a
EB		 1523 for ( ; table->ctl_name || table->procname; table++) {
1524 if (!table->ctl_name)
1525 continue;
6703ddfc 1526 if (n == table->ctl_name) {
1da177e4
LT		 1527 int error;
1528 if (table->child) {
1ff007eb 1529 if (sysctl_perm(table, 001))
1da177e4 1530 return -EPERM;
1da177e4
LT		 1531 name++;
1532 nlen--;
1533 table = table->child;
1534 goto repeat;
1535 }
1536 error = do_sysctl_strategy(table, name, nlen,
1537 oldval, oldlenp,
1f29bcd7 1538 newval, newlen);
1da177e4
LT		 1539 return error;
1540 }
1541 }
1542 return -ENOTDIR;
1543}
1544
1545/* Perform the actual read/write of a sysctl table entry. */
d8217f07 1546int do_sysctl_strategy (struct ctl_table *table,
1da177e4
LT		 1547 int __user *name, int nlen,
1548 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 1549 void __user *newval, size_t newlen)
1da177e4
LT		 1550{
1551 int op = 0, rc;
1da177e4
LT		 1552
1553 if (oldval)
1554 op |= 004;
1555 if (newval)
1556 op |= 002;
1ff007eb 1557 if (sysctl_perm(table, op))
1da177e4
LT		 1558 return -EPERM;
1559
1560 if (table->strategy) {
1561 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1f29bcd7 1562 newval, newlen);
1da177e4
LT		 1563 if (rc < 0)
1564 return rc;
1565 if (rc > 0)
1566 return 0;
1567 }
1568
1569 /* If there is no strategy routine, or if the strategy returns
1570 * zero, proceed with automatic r/w */
1571 if (table->data && table->maxlen) {
49a0c458
EB		 1572 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1573 newval, newlen);
1574 if (rc < 0)
1575 return rc;
1da177e4
LT		 1576 }
1577 return 0;
1578}
b89a8171 1579#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 1580
d912b0cc
EB		 1581static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1582{
1583 for (; table->ctl_name || table->procname; table++) {
1584 table->parent = parent;
1585 if (table->child)
1586 sysctl_set_parent(table, table->child);
1587 }
1588}
1589
1590static __init int sysctl_init(void)
1591{
fc6cd25b 1592 int err;
d912b0cc 1593 sysctl_set_parent(NULL, root_table);
e51b6ba0 1594 err = sysctl_check_table(current->nsproxy, root_table);
d912b0cc
EB		 1595 return 0;
1596}
1597
1598core_initcall(sysctl_init);
1599
1da177e4 1600/**
e51b6ba0
EB		 1601 * __register_sysctl_paths - register a sysctl hierarchy
1602 * @root: List of sysctl headers to register on
1603 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1604 * @path: The path to the directory the sysctl table is in.
1da177e4 1605 * @table: the top-level table structure
1da177e4
LT		 1606 *
1607 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1608 * array. A completely 0 filled entry terminates the table.
1da177e4 1609 *
d8217f07 1610 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1611 *
1612 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1613 * must be unique within that level of sysctl
1614 *
1615 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1616 * enter a sysctl file
1617 *
1618 * data - a pointer to data for use by proc_handler
1619 *
1620 * maxlen - the maximum size in bytes of the data
1621 *
1622 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1623 *
1624 * child - a pointer to the child sysctl table if this entry is a directory, or
1625 * %NULL.
1626 *
1627 * proc_handler - the text handler routine (described below)
1628 *
1629 * strategy - the strategy routine (described below)
1630 *
1631 * de - for internal use by the sysctl routines
1632 *
1633 * extra1, extra2 - extra pointers usable by the proc handler routines
1634 *
1635 * Leaf nodes in the sysctl tree will be represented by a single file
1636 * under /proc; non-leaf nodes will be represented by directories.
1637 *
1638 * sysctl(2) can automatically manage read and write requests through
1639 * the sysctl table. The data and maxlen fields of the ctl_table
1640 * struct enable minimal validation of the values being written to be
1641 * performed, and the mode field allows minimal authentication.
1642 *
1643 * More sophisticated management can be enabled by the provision of a
1644 * strategy routine with the table entry. This will be called before
1645 * any automatic read or write of the data is performed.
1646 *
1647 * The strategy routine may return
1648 *
1649 * < 0 - Error occurred (error is passed to user process)
1650 *
1651 * 0 - OK - proceed with automatic read or write.
1652 *
1653 * > 0 - OK - read or write has been done by the strategy routine, so
1654 * return immediately.
1655 *
1656 * There must be a proc_handler routine for any terminal nodes
1657 * mirrored under /proc/sys (non-terminals are handled by a built-in
1658 * directory handler). Several default handlers are available to
1659 * cover common cases -
1660 *
1661 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1662 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1663 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1664 *
1665 * It is the handler's job to read the input buffer from user memory
1666 * and process it. The handler should return 0 on success.
1667 *
1668 * This routine returns %NULL on a failure to register, and a pointer
1669 * to the table header on success.
1670 */
e51b6ba0
EB		 1671struct ctl_table_header *__register_sysctl_paths(
1672 struct ctl_table_root *root,
1673 struct nsproxy *namespaces,
1674 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1675{
e51b6ba0 1676 struct list_head *header_list;
29e796fd
EB		 1677 struct ctl_table_header *header;
1678 struct ctl_table *new, **prevp;
1679 unsigned int n, npath;
1680
1681 /* Count the path components */
1682 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1683 ;
1684
1685 /*
1686 * For each path component, allocate a 2-element ctl_table array.
1687 * The first array element will be filled with the sysctl entry
1688 * for this, the second will be the sentinel (ctl_name == 0).
1689 *
1690 * We allocate everything in one go so that we don't have to
1691 * worry about freeing additional memory in unregister_sysctl_table.
1692 */
1693 header = kzalloc(sizeof(struct ctl_table_header) +
1694 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1695 if (!header)
1da177e4 1696 return NULL;
29e796fd
EB		 1697
1698 new = (struct ctl_table *) (header + 1);
1699
1700 /* Now connect the dots */
1701 prevp = &header->ctl_table;
1702 for (n = 0; n < npath; ++n, ++path) {
1703 /* Copy the procname */
1704 new->procname = path->procname;
1705 new->ctl_name = path->ctl_name;
1706 new->mode = 0555;
1707
1708 *prevp = new;
1709 prevp = &new->child;
1710
1711 new += 2;
1712 }
1713 *prevp = table;
23eb06de 1714 header->ctl_table_arg = table;
29e796fd
EB		 1715
1716 INIT_LIST_HEAD(&header->ctl_entry);
1717 header->used = 0;
1718 header->unregistering = NULL;
e51b6ba0 1719 header->root = root;
29e796fd 1720 sysctl_set_parent(NULL, header->ctl_table);
e51b6ba0 1721 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1722 kfree(header);
fc6cd25b
EB		 1723 return NULL;
1724 }
330d57fb 1725 spin_lock(&sysctl_lock);
e51b6ba0
EB		 1726 header_list = lookup_header_list(root, namespaces);
1727 list_add_tail(&header->ctl_entry, header_list);
330d57fb 1728 spin_unlock(&sysctl_lock);
29e796fd
EB		 1729
1730 return header;
1731}
1732
e51b6ba0
EB		 1733/**
1734 * register_sysctl_table_path - register a sysctl table hierarchy
1735 * @path: The path to the directory the sysctl table is in.
1736 * @table: the top-level table structure
1737 *
1738 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1739 * array. A completely 0 filled entry terminates the table.
1740 *
1741 * See __register_sysctl_paths for more details.
1742 */
1743struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1744 struct ctl_table *table)
1745{
1746 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1747 path, table);
1748}
1749
29e796fd
EB		 1750/**
1751 * register_sysctl_table - register a sysctl table hierarchy
1752 * @table: the top-level table structure
1753 *
1754 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1755 * array. A completely 0 filled entry terminates the table.
1756 *
1757 * See register_sysctl_paths for more details.
1758 */
1759struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1760{
1761 static const struct ctl_path null_path[] = { {} };
1762
1763 return register_sysctl_paths(null_path, table);
1da177e4
LT		 1764}
1765
1766/**
1767 * unregister_sysctl_table - unregister a sysctl table hierarchy
1768 * @header: the header returned from register_sysctl_table
1769 *
1770 * Unregisters the sysctl table and all children. proc entries may not
1771 * actually be removed until they are no longer used by anyone.
1772 */
1773void unregister_sysctl_table(struct ctl_table_header * header)
1774{
330d57fb 1775 might_sleep();
f1dad166
PE		 1776
1777 if (header == NULL)
1778 return;
1779
330d57fb
AV		 1780 spin_lock(&sysctl_lock);
1781 start_unregistering(header);
330d57fb 1782 spin_unlock(&sysctl_lock);
1da177e4
LT		 1783 kfree(header);
1784}
1785
b89a8171 1786#else /* !CONFIG_SYSCTL */
d8217f07 1787struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 1788{
1789 return NULL;
1790}
1791
29e796fd
EB		 1792struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1793 struct ctl_table *table)
1794{
1795 return NULL;
1796}
1797
b89a8171
EB		 1798void unregister_sysctl_table(struct ctl_table_header * table)
1799{
1800}
1801
1802#endif /* CONFIG_SYSCTL */
1803
1da177e4
LT		 1804/*
1805 * /proc/sys support
1806 */
1807
b89a8171 1808#ifdef CONFIG_PROC_SYSCTL
1da177e4 1809
b1ba4ddd
AB		 1810static int _proc_do_string(void* data, int maxlen, int write,
1811 struct file *filp, void __user *buffer,
1812 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1813{
1814 size_t len;
1815 char __user *p;
1816 char c;
8d060877
ON		 1817
1818 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1819 *lenp = 0;
1820 return 0;
1821 }
8d060877 1822
1da177e4
LT		 1823 if (write) {
1824 len = 0;
1825 p = buffer;
1826 while (len < *lenp) {
1827 if (get_user(c, p++))
1828 return -EFAULT;
1829 if (c == 0 || c == '\n')
1830 break;
1831 len++;
1832 }
f5dd3d6f
SV		 1833 if (len >= maxlen)
1834 len = maxlen-1;
1835 if(copy_from_user(data, buffer, len))
1da177e4 1836 return -EFAULT;
f5dd3d6f 1837 ((char *) data)[len] = 0;
1da177e4
LT		 1838 *ppos += *lenp;
1839 } else {
f5dd3d6f
SV		 1840 len = strlen(data);
1841 if (len > maxlen)
1842 len = maxlen;
8d060877
ON		 1843
1844 if (*ppos > len) {
1845 *lenp = 0;
1846 return 0;
1847 }
1848
1849 data += *ppos;
1850 len -= *ppos;
1851
1da177e4
LT		 1852 if (len > *lenp)
1853 len = *lenp;
1854 if (len)
f5dd3d6f 1855 if(copy_to_user(buffer, data, len))
1da177e4
LT		 1856 return -EFAULT;
1857 if (len < *lenp) {
1858 if(put_user('\n', ((char __user *) buffer) + len))
1859 return -EFAULT;
1860 len++;
1861 }
1862 *lenp = len;
1863 *ppos += len;
1864 }
1865 return 0;
1866}
1867
f5dd3d6f
SV		 1868/**
1869 * proc_dostring - read a string sysctl
1870 * @table: the sysctl table
1871 * @write: %TRUE if this is a write to the sysctl file
1872 * @filp: the file structure
1873 * @buffer: the user buffer
1874 * @lenp: the size of the user buffer
1875 * @ppos: file position
1876 *
1877 * Reads/writes a string from/to the user buffer. If the kernel
1878 * buffer provided is not large enough to hold the string, the
1879 * string is truncated. The copied string is %NULL-terminated.
1880 * If the string is being read by the user process, it is copied
1881 * and a newline '\n' is added. It is truncated if the buffer is
1882 * not large enough.
1883 *
1884 * Returns 0 on success.
1885 */
d8217f07 1886int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 1887 void __user *buffer, size_t *lenp, loff_t *ppos)
1888{
1889 return _proc_do_string(table->data, table->maxlen, write, filp,
1890 buffer, lenp, ppos);
1891}
1892
1da177e4
LT		 1893
1894static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1895 int *valp,
1896 int write, void *data)
1897{
1898 if (write) {
1899 *valp = *negp ? -*lvalp : *lvalp;
1900 } else {
1901 int val = *valp;
1902 if (val < 0) {
1903 *negp = -1;
1904 *lvalp = (unsigned long)-val;
1905 } else {
1906 *negp = 0;
1907 *lvalp = (unsigned long)val;
1908 }
1909 }
1910 return 0;
1911}
1912
d8217f07 1913static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 1914 int write, struct file *filp, void __user *buffer,
1915 size_t *lenp, loff_t *ppos,
1da177e4
LT		 1916 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1917 int write, void *data),
1918 void *data)
1919{
1920#define TMPBUFLEN 21
1921 int *i, vleft, first=1, neg, val;
1922 unsigned long lval;
1923 size_t left, len;
1924
1925 char buf[TMPBUFLEN], *p;
1926 char __user *s = buffer;
1927
fcfbd547 1928 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 1929 (*ppos && !write)) {
1930 *lenp = 0;
1931 return 0;
1932 }
1933
fcfbd547 1934 i = (int *) tbl_data;
1da177e4
LT		 1935 vleft = table->maxlen / sizeof(*i);
1936 left = *lenp;
1937
1938 if (!conv)
1939 conv = do_proc_dointvec_conv;
1940
1941 for (; left && vleft--; i++, first=0) {
1942 if (write) {
1943 while (left) {
1944 char c;
1945 if (get_user(c, s))
1946 return -EFAULT;
1947 if (!isspace(c))
1948 break;
1949 left--;
1950 s++;
1951 }
1952 if (!left)
1953 break;
1954 neg = 0;
1955 len = left;
1956 if (len > sizeof(buf) - 1)
1957 len = sizeof(buf) - 1;
1958 if (copy_from_user(buf, s, len))
1959 return -EFAULT;
1960 buf[len] = 0;
1961 p = buf;
1962 if (*p == '-' && left > 1) {
1963 neg = 1;
bd9b0bac 1964 p++;
1da177e4
LT		 1965 }
1966 if (*p < '0' || *p > '9')
1967 break;
1968
1969 lval = simple_strtoul(p, &p, 0);
1970
1971 len = p-buf;
1972 if ((len < left) && *p && !isspace(*p))
1973 break;
1974 if (neg)
1975 val = -val;
1976 s += len;
1977 left -= len;
1978
1979 if (conv(&neg, &lval, i, 1, data))
1980 break;
1981 } else {
1982 p = buf;
1983 if (!first)
1984 *p++ = '\t';
1985
1986 if (conv(&neg, &lval, i, 0, data))
1987 break;
1988
1989 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1990 len = strlen(buf);
1991 if (len > left)
1992 len = left;
1993 if(copy_to_user(s, buf, len))
1994 return -EFAULT;
1995 left -= len;
1996 s += len;
1997 }
1998 }
1999
2000 if (!write && !first && left) {
2001 if(put_user('\n', s))
2002 return -EFAULT;
2003 left--, s++;
2004 }
2005 if (write) {
2006 while (left) {
2007 char c;
2008 if (get_user(c, s++))
2009 return -EFAULT;
2010 if (!isspace(c))
2011 break;
2012 left--;
2013 }
2014 }
2015 if (write && first)
2016 return -EINVAL;
2017 *lenp -= left;
2018 *ppos += *lenp;
2019 return 0;
2020#undef TMPBUFLEN
2021}
2022
d8217f07 2023static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2024 void __user *buffer, size_t *lenp, loff_t *ppos,
2025 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2026 int write, void *data),
2027 void *data)
2028{
2029 return __do_proc_dointvec(table->data, table, write, filp,
2030 buffer, lenp, ppos, conv, data);
2031}
2032
1da177e4
LT		 2033/**
2034 * proc_dointvec - read a vector of integers
2035 * @table: the sysctl table
2036 * @write: %TRUE if this is a write to the sysctl file
2037 * @filp: the file structure
2038 * @buffer: the user buffer
2039 * @lenp: the size of the user buffer
2040 * @ppos: file position
2041 *
2042 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2043 * values from/to the user buffer, treated as an ASCII string.
2044 *
2045 * Returns 0 on success.
2046 */
d8217f07 2047int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2048 void __user *buffer, size_t *lenp, loff_t *ppos)
2049{
2050 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2051 NULL,NULL);
2052}
2053
2054#define OP_SET 0
2055#define OP_AND 1
34f5a398 2056#define OP_OR 2
1da177e4
LT		 2057
2058static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2059 int *valp,
2060 int write, void *data)
2061{
2062 int op = *(int *)data;
2063 if (write) {
2064 int val = *negp ? -*lvalp : *lvalp;
2065 switch(op) {
2066 case OP_SET: *valp = val; break;
2067 case OP_AND: *valp &= val; break;
34f5a398 2068 case OP_OR: *valp |= val; break;
1da177e4
LT		 2069 }
2070 } else {
2071 int val = *valp;
2072 if (val < 0) {
2073 *negp = -1;
2074 *lvalp = (unsigned long)-val;
2075 } else {
2076 *negp = 0;
2077 *lvalp = (unsigned long)val;
2078 }
2079 }
2080 return 0;
2081}
2082
72c2d582 2083#ifdef CONFIG_SECURITY_CAPABILITIES
1da177e4
LT		 2084/*
2085 * init may raise the set.
2086 */
72c2d582 2087
d8217f07 2088int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2089 void __user *buffer, size_t *lenp, loff_t *ppos)
2090{
2091 int op;
2092
6ff1b442 2093 if (write && !capable(CAP_SYS_MODULE)) {
1da177e4
LT		 2094 return -EPERM;
2095 }
2096
b460cbc5 2097 op = is_global_init(current) ? OP_SET : OP_AND;
1da177e4
LT		 2098 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2099 do_proc_dointvec_bset_conv,&op);
2100}
72c2d582 2101#endif /* def CONFIG_SECURITY_CAPABILITIES */
1da177e4 2102
34f5a398
TT		 2103/*
2104 * Taint values can only be increased
2105 */
d8217f07 2106static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2107 void __user *buffer, size_t *lenp, loff_t *ppos)
2108{
2109 int op;
2110
91fcd412 2111 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2112 return -EPERM;
2113
2114 op = OP_OR;
2115 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2116 do_proc_dointvec_bset_conv,&op);
2117}
2118
1da177e4
LT		 2119struct do_proc_dointvec_minmax_conv_param {
2120 int *min;
2121 int *max;
2122};
2123
2124static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2125 int *valp,
2126 int write, void *data)
2127{
2128 struct do_proc_dointvec_minmax_conv_param *param = data;
2129 if (write) {
2130 int val = *negp ? -*lvalp : *lvalp;
2131 if ((param->min && *param->min > val) ||
2132 (param->max && *param->max < val))
2133 return -EINVAL;
2134 *valp = val;
2135 } else {
2136 int val = *valp;
2137 if (val < 0) {
2138 *negp = -1;
2139 *lvalp = (unsigned long)-val;
2140 } else {
2141 *negp = 0;
2142 *lvalp = (unsigned long)val;
2143 }
2144 }
2145 return 0;
2146}
2147
2148/**
2149 * proc_dointvec_minmax - read a vector of integers with min/max values
2150 * @table: the sysctl table
2151 * @write: %TRUE if this is a write to the sysctl file
2152 * @filp: the file structure
2153 * @buffer: the user buffer
2154 * @lenp: the size of the user buffer
2155 * @ppos: file position
2156 *
2157 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2158 * values from/to the user buffer, treated as an ASCII string.
2159 *
2160 * This routine will ensure the values are within the range specified by
2161 * table->extra1 (min) and table->extra2 (max).
2162 *
2163 * Returns 0 on success.
2164 */
d8217f07 2165int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2166 void __user *buffer, size_t *lenp, loff_t *ppos)
2167{
2168 struct do_proc_dointvec_minmax_conv_param param = {
2169 .min = (int *) table->extra1,
2170 .max = (int *) table->extra2,
2171 };
2172 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2173 do_proc_dointvec_minmax_conv, &param);
2174}
2175
d8217f07 2176static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2177 struct file *filp,
2178 void __user *buffer,
2179 size_t *lenp, loff_t *ppos,
2180 unsigned long convmul,
2181 unsigned long convdiv)
2182{
2183#define TMPBUFLEN 21
2184 unsigned long *i, *min, *max, val;
2185 int vleft, first=1, neg;
2186 size_t len, left;
2187 char buf[TMPBUFLEN], *p;
2188 char __user *s = buffer;
2189
fcfbd547 2190 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2191 (*ppos && !write)) {
2192 *lenp = 0;
2193 return 0;
2194 }
2195
fcfbd547 2196 i = (unsigned long *) data;
1da177e4
LT		 2197 min = (unsigned long *) table->extra1;
2198 max = (unsigned long *) table->extra2;
2199 vleft = table->maxlen / sizeof(unsigned long);
2200 left = *lenp;
2201
2202 for (; left && vleft--; i++, min++, max++, first=0) {
2203 if (write) {
2204 while (left) {
2205 char c;
2206 if (get_user(c, s))
2207 return -EFAULT;
2208 if (!isspace(c))
2209 break;
2210 left--;
2211 s++;
2212 }
2213 if (!left)
2214 break;
2215 neg = 0;
2216 len = left;
2217 if (len > TMPBUFLEN-1)
2218 len = TMPBUFLEN-1;
2219 if (copy_from_user(buf, s, len))
2220 return -EFAULT;
2221 buf[len] = 0;
2222 p = buf;
2223 if (*p == '-' && left > 1) {
2224 neg = 1;
bd9b0bac 2225 p++;
1da177e4
LT		 2226 }
2227 if (*p < '0' || *p > '9')
2228 break;
2229 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2230 len = p-buf;
2231 if ((len < left) && *p && !isspace(*p))
2232 break;
2233 if (neg)
2234 val = -val;
2235 s += len;
2236 left -= len;
2237
2238 if(neg)
2239 continue;
2240 if ((min && val < *min) || (max && val > *max))
2241 continue;
2242 *i = val;
2243 } else {
2244 p = buf;
2245 if (!first)
2246 *p++ = '\t';
2247 sprintf(p, "%lu", convdiv * (*i) / convmul);
2248 len = strlen(buf);
2249 if (len > left)
2250 len = left;
2251 if(copy_to_user(s, buf, len))
2252 return -EFAULT;
2253 left -= len;
2254 s += len;
2255 }
2256 }
2257
2258 if (!write && !first && left) {
2259 if(put_user('\n', s))
2260 return -EFAULT;
2261 left--, s++;
2262 }
2263 if (write) {
2264 while (left) {
2265 char c;
2266 if (get_user(c, s++))
2267 return -EFAULT;
2268 if (!isspace(c))
2269 break;
2270 left--;
2271 }
2272 }
2273 if (write && first)
2274 return -EINVAL;
2275 *lenp -= left;
2276 *ppos += *lenp;
2277 return 0;
2278#undef TMPBUFLEN
2279}
2280
d8217f07 2281static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2282 struct file *filp,
2283 void __user *buffer,
2284 size_t *lenp, loff_t *ppos,
2285 unsigned long convmul,
2286 unsigned long convdiv)
2287{
2288 return __do_proc_doulongvec_minmax(table->data, table, write,
2289 filp, buffer, lenp, ppos, convmul, convdiv);
2290}
2291
1da177e4
LT		 2292/**
2293 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2294 * @table: the sysctl table
2295 * @write: %TRUE if this is a write to the sysctl file
2296 * @filp: the file structure
2297 * @buffer: the user buffer
2298 * @lenp: the size of the user buffer
2299 * @ppos: file position
2300 *
2301 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2302 * values from/to the user buffer, treated as an ASCII string.
2303 *
2304 * This routine will ensure the values are within the range specified by
2305 * table->extra1 (min) and table->extra2 (max).
2306 *
2307 * Returns 0 on success.
2308 */
d8217f07 2309int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2310 void __user *buffer, size_t *lenp, loff_t *ppos)
2311{
2312 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2313}
2314
2315/**
2316 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2317 * @table: the sysctl table
2318 * @write: %TRUE if this is a write to the sysctl file
2319 * @filp: the file structure
2320 * @buffer: the user buffer
2321 * @lenp: the size of the user buffer
2322 * @ppos: file position
2323 *
2324 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2325 * values from/to the user buffer, treated as an ASCII string. The values
2326 * are treated as milliseconds, and converted to jiffies when they are stored.
2327 *
2328 * This routine will ensure the values are within the range specified by
2329 * table->extra1 (min) and table->extra2 (max).
2330 *
2331 * Returns 0 on success.
2332 */
d8217f07 2333int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2334 struct file *filp,
2335 void __user *buffer,
2336 size_t *lenp, loff_t *ppos)
2337{
2338 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2339 lenp, ppos, HZ, 1000l);
2340}
2341
2342
2343static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2344 int *valp,
2345 int write, void *data)
2346{
2347 if (write) {
cba9f33d
BS		 2348 if (*lvalp > LONG_MAX / HZ)
2349 return 1;
1da177e4
LT		 2350 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2351 } else {
2352 int val = *valp;
2353 unsigned long lval;
2354 if (val < 0) {
2355 *negp = -1;
2356 lval = (unsigned long)-val;
2357 } else {
2358 *negp = 0;
2359 lval = (unsigned long)val;
2360 }
2361 *lvalp = lval / HZ;
2362 }
2363 return 0;
2364}
2365
2366static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2367 int *valp,
2368 int write, void *data)
2369{
2370 if (write) {
cba9f33d
BS		 2371 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2372 return 1;
1da177e4
LT		 2373 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2374 } else {
2375 int val = *valp;
2376 unsigned long lval;
2377 if (val < 0) {
2378 *negp = -1;
2379 lval = (unsigned long)-val;
2380 } else {
2381 *negp = 0;
2382 lval = (unsigned long)val;
2383 }
2384 *lvalp = jiffies_to_clock_t(lval);
2385 }
2386 return 0;
2387}
2388
2389static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2390 int *valp,
2391 int write, void *data)
2392{
2393 if (write) {
2394 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2395 } else {
2396 int val = *valp;
2397 unsigned long lval;
2398 if (val < 0) {
2399 *negp = -1;
2400 lval = (unsigned long)-val;
2401 } else {
2402 *negp = 0;
2403 lval = (unsigned long)val;
2404 }
2405 *lvalp = jiffies_to_msecs(lval);
2406 }
2407 return 0;
2408}
2409
2410/**
2411 * proc_dointvec_jiffies - read a vector of integers as seconds
2412 * @table: the sysctl table
2413 * @write: %TRUE if this is a write to the sysctl file
2414 * @filp: the file structure
2415 * @buffer: the user buffer
2416 * @lenp: the size of the user buffer
2417 * @ppos: file position
2418 *
2419 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2420 * values from/to the user buffer, treated as an ASCII string.
2421 * The values read are assumed to be in seconds, and are converted into
2422 * jiffies.
2423 *
2424 * Returns 0 on success.
2425 */
d8217f07 2426int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2427 void __user *buffer, size_t *lenp, loff_t *ppos)
2428{
2429 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2430 do_proc_dointvec_jiffies_conv,NULL);
2431}
2432
2433/**
2434 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2435 * @table: the sysctl table
2436 * @write: %TRUE if this is a write to the sysctl file
2437 * @filp: the file structure
2438 * @buffer: the user buffer
2439 * @lenp: the size of the user buffer
1e5d5331 2440 * @ppos: pointer to the file position
1da177e4
LT		 2441 *
2442 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2443 * values from/to the user buffer, treated as an ASCII string.
2444 * The values read are assumed to be in 1/USER_HZ seconds, and
2445 * are converted into jiffies.
2446 *
2447 * Returns 0 on success.
2448 */
d8217f07 2449int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2450 void __user *buffer, size_t *lenp, loff_t *ppos)
2451{
2452 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2453 do_proc_dointvec_userhz_jiffies_conv,NULL);
2454}
2455
2456/**
2457 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2458 * @table: the sysctl table
2459 * @write: %TRUE if this is a write to the sysctl file
2460 * @filp: the file structure
2461 * @buffer: the user buffer
2462 * @lenp: the size of the user buffer
67be2dd1
MW		 2463 * @ppos: file position
2464 * @ppos: the current position in the file
1da177e4
LT		 2465 *
2466 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2467 * values from/to the user buffer, treated as an ASCII string.
2468 * The values read are assumed to be in 1/1000 seconds, and
2469 * are converted into jiffies.
2470 *
2471 * Returns 0 on success.
2472 */
d8217f07 2473int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2474 void __user *buffer, size_t *lenp, loff_t *ppos)
2475{
2476 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2477 do_proc_dointvec_ms_jiffies_conv, NULL);
2478}
2479
d8217f07 2480static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2481 void __user *buffer, size_t *lenp, loff_t *ppos)
2482{
2483 struct pid *new_pid;
2484 pid_t tmp;
2485 int r;
2486
b488893a 2487 tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
9ec52099
CLG		 2488
2489 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2490 lenp, ppos, NULL, NULL);
2491 if (r || !write)
2492 return r;
2493
2494 new_pid = find_get_pid(tmp);
2495 if (!new_pid)
2496 return -ESRCH;
2497
2498 put_pid(xchg(&cad_pid, new_pid));
2499 return 0;
2500}
2501
1da177e4
LT		 2502#else /* CONFIG_PROC_FS */
2503
d8217f07 2504int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2505 void __user *buffer, size_t *lenp, loff_t *ppos)
2506{
2507 return -ENOSYS;
2508}
2509
d8217f07 2510int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2511 void __user *buffer, size_t *lenp, loff_t *ppos)
2512{
2513 return -ENOSYS;
2514}
2515
d8217f07 2516int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2517 void __user *buffer, size_t *lenp, loff_t *ppos)
2518{
2519 return -ENOSYS;
2520}
2521
d8217f07 2522int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2523 void __user *buffer, size_t *lenp, loff_t *ppos)
2524{
2525 return -ENOSYS;
2526}
2527
d8217f07 2528int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2529 void __user *buffer, size_t *lenp, loff_t *ppos)
2530{
2531 return -ENOSYS;
2532}
2533
d8217f07 2534int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2535 void __user *buffer, size_t *lenp, loff_t *ppos)
2536{
2537 return -ENOSYS;
2538}
2539
d8217f07 2540int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2541 void __user *buffer, size_t *lenp, loff_t *ppos)
2542{
2543 return -ENOSYS;
2544}
2545
d8217f07 2546int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2547 void __user *buffer, size_t *lenp, loff_t *ppos)
2548{
2549 return -ENOSYS;
2550}
2551
d8217f07 2552int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2553 struct file *filp,
2554 void __user *buffer,
2555 size_t *lenp, loff_t *ppos)
2556{
2557 return -ENOSYS;
2558}
2559
2560
2561#endif /* CONFIG_PROC_FS */
2562
2563
b89a8171 2564#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2565/*
2566 * General sysctl support routines
2567 */
2568
49a0c458
EB		 2569/* The generic sysctl data routine (used if no strategy routine supplied) */
2570int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2571 void __user *oldval, size_t __user *oldlenp,
2572 void __user *newval, size_t newlen)
2573{
2574 size_t len;
2575
2576 /* Get out of I don't have a variable */
2577 if (!table->data || !table->maxlen)
2578 return -ENOTDIR;
2579
2580 if (oldval && oldlenp) {
2581 if (get_user(len, oldlenp))
2582 return -EFAULT;
2583 if (len) {
2584 if (len > table->maxlen)
2585 len = table->maxlen;
2586 if (copy_to_user(oldval, table->data, len))
2587 return -EFAULT;
2588 if (put_user(len, oldlenp))
2589 return -EFAULT;
2590 }
2591 }
2592
2593 if (newval && newlen) {
2594 if (newlen > table->maxlen)
2595 newlen = table->maxlen;
2596
2597 if (copy_from_user(table->data, newval, newlen))
2598 return -EFAULT;
2599 }
2600 return 1;
2601}
2602
1da177e4 2603/* The generic string strategy routine: */
d8217f07 2604int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2605 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2606 void __user *newval, size_t newlen)
1da177e4 2607{
1da177e4
LT		 2608 if (!table->data || !table->maxlen)
2609 return -ENOTDIR;
2610
2611 if (oldval && oldlenp) {
de9e007d
LT		 2612 size_t bufsize;
2613 if (get_user(bufsize, oldlenp))
1da177e4 2614 return -EFAULT;
de9e007d
LT		 2615 if (bufsize) {
2616 size_t len = strlen(table->data), copied;
2617
2618 /* This shouldn't trigger for a well-formed sysctl */
2619 if (len > table->maxlen)
1da177e4 2620 len = table->maxlen;
de9e007d
LT		 2621
2622 /* Copy up to a max of bufsize-1 bytes of the string */
2623 copied = (len >= bufsize) ? bufsize - 1 : len;
2624
2625 if (copy_to_user(oldval, table->data, copied) ||
2626 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2627 return -EFAULT;
de9e007d 2628 if (put_user(len, oldlenp))
1da177e4
LT		 2629 return -EFAULT;
2630 }
2631 }
2632 if (newval && newlen) {
de9e007d 2633 size_t len = newlen;
1da177e4
LT		 2634 if (len > table->maxlen)
2635 len = table->maxlen;
2636 if(copy_from_user(table->data, newval, len))
2637 return -EFAULT;
2638 if (len == table->maxlen)
2639 len--;
2640 ((char *) table->data)[len] = 0;
2641 }
82c9df82 2642 return 1;
1da177e4
LT		 2643}
2644
2645/*
2646 * This function makes sure that all of the integers in the vector
2647 * are between the minimum and maximum values given in the arrays
2648 * table->extra1 and table->extra2, respectively.
2649 */
d8217f07 2650int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2651 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2652 void __user *newval, size_t newlen)
1da177e4
LT		 2653{
2654
2655 if (newval && newlen) {
2656 int __user *vec = (int __user *) newval;
2657 int *min = (int *) table->extra1;
2658 int *max = (int *) table->extra2;
2659 size_t length;
2660 int i;
2661
2662 if (newlen % sizeof(int) != 0)
2663 return -EINVAL;
2664
2665 if (!table->extra1 && !table->extra2)
2666 return 0;
2667
2668 if (newlen > table->maxlen)
2669 newlen = table->maxlen;
2670 length = newlen / sizeof(int);
2671
2672 for (i = 0; i < length; i++) {
2673 int value;
2674 if (get_user(value, vec + i))
2675 return -EFAULT;
2676 if (min && value < min[i])
2677 return -EINVAL;
2678 if (max && value > max[i])
2679 return -EINVAL;
2680 }
2681 }
2682 return 0;
2683}
2684
2685/* Strategy function to convert jiffies to seconds */
d8217f07 2686int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2687 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2688 void __user *newval, size_t newlen)
1da177e4 2689{
3ee75ac3 2690 if (oldval && oldlenp) {
1da177e4 2691 size_t olen;
3ee75ac3
AD		 2692
2693 if (get_user(olen, oldlenp))
2694 return -EFAULT;
2695 if (olen) {
2696 int val;
2697
2698 if (olen < sizeof(int))
2699 return -EINVAL;
2700
2701 val = *(int *)(table->data) / HZ;
2702 if (put_user(val, (int __user *)oldval))
2703 return -EFAULT;
2704 if (put_user(sizeof(int), oldlenp))
1da177e4 2705 return -EFAULT;
1da177e4 2706 }
1da177e4
LT		 2707 }
2708 if (newval && newlen) {
2709 int new;
2710 if (newlen != sizeof(int))
2711 return -EINVAL;
2712 if (get_user(new, (int __user *)newval))
2713 return -EFAULT;
2714 *(int *)(table->data) = new*HZ;
2715 }
2716 return 1;
2717}
2718
2719/* Strategy function to convert jiffies to seconds */
d8217f07 2720int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2721 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2722 void __user *newval, size_t newlen)
1da177e4 2723{
3ee75ac3 2724 if (oldval && oldlenp) {
1da177e4 2725 size_t olen;
3ee75ac3
AD		 2726
2727 if (get_user(olen, oldlenp))
2728 return -EFAULT;
2729 if (olen) {
2730 int val;
2731
2732 if (olen < sizeof(int))
2733 return -EINVAL;
2734
2735 val = jiffies_to_msecs(*(int *)(table->data));
2736 if (put_user(val, (int __user *)oldval))
2737 return -EFAULT;
2738 if (put_user(sizeof(int), oldlenp))
1da177e4 2739 return -EFAULT;
1da177e4 2740 }
1da177e4
LT		 2741 }
2742 if (newval && newlen) {
2743 int new;
2744 if (newlen != sizeof(int))
2745 return -EINVAL;
2746 if (get_user(new, (int __user *)newval))
2747 return -EFAULT;
2748 *(int *)(table->data) = msecs_to_jiffies(new);
2749 }
2750 return 1;
2751}
2752
c4b8b769 2753
c4b8b769 2754
b89a8171 2755#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 2756
2757
2758asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2759{
0e009be8 2760 struct __sysctl_args tmp;
7058cb02 2761 int error;
0e009be8 2762
0e009be8
EB		 2763 if (copy_from_user(&tmp, args, sizeof(tmp)))
2764 return -EFAULT;
0e009be8 2765
7058cb02 2766 error = deprecated_sysctl_warning(&tmp);
b89a8171 2767
7058cb02
EB		 2768 /* If no error reading the parameters then just -ENOSYS ... */
2769 if (!error)
2770 error = -ENOSYS;
2771
2772 return error;
1da177e4
LT		 2773}
2774
49a0c458
EB		 2775int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2776 void __user *oldval, size_t __user *oldlenp,
2777 void __user *newval, size_t newlen)
2778{
2779 return -ENOSYS;
2780}
2781
d8217f07 2782int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2783 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2784 void __user *newval, size_t newlen)
1da177e4
LT		 2785{
2786 return -ENOSYS;
2787}
2788
d8217f07 2789int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2790 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2791 void __user *newval, size_t newlen)
1da177e4
LT		 2792{
2793 return -ENOSYS;
2794}
2795
d8217f07 2796int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2797 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2798 void __user *newval, size_t newlen)
1da177e4
LT		 2799{
2800 return -ENOSYS;
2801}
2802
d8217f07 2803int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2804 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2805 void __user *newval, size_t newlen)
1da177e4
LT		 2806{
2807 return -ENOSYS;
2808}
2809
b89a8171 2810#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 2811
7058cb02
EB		 2812static int deprecated_sysctl_warning(struct __sysctl_args *args)
2813{
2814 static int msg_count;
2815 int name[CTL_MAXNAME];
2816 int i;
2817
6fc48af8
TH		 2818 /* Check args->nlen. */
2819 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2820 return -ENOTDIR;
2821
7058cb02
EB		 2822 /* Read in the sysctl name for better debug message logging */
2823 for (i = 0; i < args->nlen; i++)
2824 if (get_user(name[i], args->name + i))
2825 return -EFAULT;
2826
2827 /* Ignore accesses to kernel.version */
2828 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2829 return 0;
2830
2831 if (msg_count < 5) {
2832 msg_count++;
2833 printk(KERN_INFO
2834 "warning: process `%s' used the deprecated sysctl "
2835 "system call with ", current->comm);
2836 for (i = 0; i < args->nlen; i++)
2837 printk("%d.", name[i]);
2838 printk("\n");
2839 }
2840 return 0;
2841}
2842
1da177e4
LT		 2843/*
2844 * No sense putting this after each symbol definition, twice,
2845 * exception granted :-)
2846 */
2847EXPORT_SYMBOL(proc_dointvec);
2848EXPORT_SYMBOL(proc_dointvec_jiffies);
2849EXPORT_SYMBOL(proc_dointvec_minmax);
2850EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2851EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2852EXPORT_SYMBOL(proc_dostring);
2853EXPORT_SYMBOL(proc_doulongvec_minmax);
2854EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2855EXPORT_SYMBOL(register_sysctl_table);
29e796fd 2856EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 2857EXPORT_SYMBOL(sysctl_intvec);
2858EXPORT_SYMBOL(sysctl_jiffies);
2859EXPORT_SYMBOL(sysctl_ms_jiffies);
2860EXPORT_SYMBOL(sysctl_string);
49a0c458 2861EXPORT_SYMBOL(sysctl_data);
1da177e4 2862EXPORT_SYMBOL(unregister_sysctl_table);
kernel source for telekom puls (alcatel/mediatek)