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sched: rt-group: deal with PI
[net-next-2.6.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>
1da177e4
LT		 40#include <linux/initrd.h>
41#include <linux/times.h>
42#include <linux/limits.h>
43#include <linux/dcache.h>
44#include <linux/syscalls.h>
c255d844
PM		 45#include <linux/nfs_fs.h>
46#include <linux/acpi.h>
10a0a8d4 47#include <linux/reboot.h>
1da177e4
LT		 48
49#include <asm/uaccess.h>
50#include <asm/processor.h>
51
29cbc78b
AK		 52#ifdef CONFIG_X86
53#include <asm/nmi.h>
0741f4d2 54#include <asm/stacktrace.h>
6e7c4025 55#include <asm/io.h>
29cbc78b
AK		 56#endif
57
7058cb02
EB		 58static int deprecated_sysctl_warning(struct __sysctl_args *args);
59
1da177e4
LT		 60#if defined(CONFIG_SYSCTL)
61
62/* External variables not in a header file. */
63extern int C_A_D;
45807a1d 64extern int print_fatal_signals;
1da177e4
LT		 65extern int sysctl_overcommit_memory;
66extern int sysctl_overcommit_ratio;
fadd8fbd 67extern int sysctl_panic_on_oom;
fe071d7e 68extern int sysctl_oom_kill_allocating_task;
fef1bdd6 69extern int sysctl_oom_dump_tasks;
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;
1da177e4 76extern int pid_max_min, pid_max_max;
9d0243bc 77extern int sysctl_drop_caches;
8ad4b1fb 78extern int percpu_pagelist_fraction;
bebfa101 79extern int compat_log;
5096add8 80extern int maps_protect;
77461ab3 81extern int sysctl_stat_interval;
9745512c 82extern int latencytop_enabled;
1da177e4 83
c4f3b63f 84/* Constants used for minimum and maximum */
195cf453 85#if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
c4f3b63f 86static int one = 1;
195cf453
BG		 87#endif
88
89#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f
RT		 90static int sixty = 60;
91#endif
92
93#ifdef CONFIG_MMU
94static int two = 2;
95#endif
96
97static int zero;
98static int one_hundred = 100;
99
1da177e4
LT		 100/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
101static int maxolduid = 65535;
102static int minolduid;
8ad4b1fb 103static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 104
105static int ngroups_max = NGROUPS_MAX;
106
107#ifdef CONFIG_KMOD
108extern char modprobe_path[];
109#endif
1da177e4
LT		 110#ifdef CONFIG_CHR_DEV_SG
111extern int sg_big_buff;
112#endif
1da177e4
LT		 113
114#ifdef __sparc__
115extern char reboot_command [];
116extern int stop_a_enabled;
117extern int scons_pwroff;
118#endif
119
120#ifdef __hppa__
121extern int pwrsw_enabled;
122extern int unaligned_enabled;
123#endif
124
347a8dc3 125#ifdef CONFIG_S390
1da177e4
LT		 126#ifdef CONFIG_MATHEMU
127extern int sysctl_ieee_emulation_warnings;
128#endif
129extern int sysctl_userprocess_debug;
951f22d5 130extern int spin_retry;
1da177e4
LT		 131#endif
132
133extern int sysctl_hz_timer;
134
135#ifdef CONFIG_BSD_PROCESS_ACCT
136extern int acct_parm[];
137#endif
138
d2b176ed
JS		 139#ifdef CONFIG_IA64
140extern int no_unaligned_warning;
141#endif
142
23f78d4a
IM		 143#ifdef CONFIG_RT_MUTEXES
144extern int max_lock_depth;
145#endif
146
b89a8171
EB		 147#ifdef CONFIG_SYSCTL_SYSCALL
148static int parse_table(int __user *, int, void __user *, size_t __user *,
d8217f07 149 void __user *, size_t, struct ctl_table *);
b89a8171
EB		 150#endif
151
6b49a257 152
d6f8ff73 153#ifdef CONFIG_PROC_SYSCTL
d8217f07 154static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 155 void __user *buffer, size_t *lenp, loff_t *ppos);
d8217f07 156static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 157 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 158#endif
9ec52099 159
d8217f07 160static struct ctl_table root_table[];
e51b6ba0
EB		 161static struct ctl_table_root sysctl_table_root;
162static struct ctl_table_header root_table_header = {
163 .ctl_table = root_table,
164 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
165 .root = &sysctl_table_root,
166};
167static struct ctl_table_root sysctl_table_root = {
168 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
169 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
170};
1da177e4 171
d8217f07
EB		 172static struct ctl_table kern_table[];
173static struct ctl_table vm_table[];
174static struct ctl_table fs_table[];
175static struct ctl_table debug_table[];
176static struct ctl_table dev_table[];
177extern struct ctl_table random_table[];
2d9048e2 178#ifdef CONFIG_INOTIFY_USER
d8217f07 179extern struct ctl_table inotify_table[];
0399cb08 180#endif
1da177e4
LT		 181
182#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
183int sysctl_legacy_va_layout;
184#endif
185
f20786ff
PZ		 186extern int prove_locking;
187extern int lock_stat;
9bc9a6bd 188
1da177e4
LT		 189/* The default sysctl tables: */
190
d8217f07 191static struct ctl_table root_table[] = {
1da177e4
LT		 192 {
193 .ctl_name = CTL_KERN,
194 .procname = "kernel",
195 .mode = 0555,
196 .child = kern_table,
197 },
198 {
199 .ctl_name = CTL_VM,
200 .procname = "vm",
201 .mode = 0555,
202 .child = vm_table,
203 },
1da177e4
LT		 204 {
205 .ctl_name = CTL_FS,
206 .procname = "fs",
207 .mode = 0555,
208 .child = fs_table,
209 },
210 {
211 .ctl_name = CTL_DEBUG,
212 .procname = "debug",
213 .mode = 0555,
214 .child = debug_table,
215 },
216 {
217 .ctl_name = CTL_DEV,
218 .procname = "dev",
219 .mode = 0555,
220 .child = dev_table,
221 },
2be7fe07
AM		 222/*
223 * NOTE: do not add new entries to this table unless you have read
224 * Documentation/sysctl/ctl_unnumbered.txt
225 */
1da177e4
LT		 226 { .ctl_name = 0 }
227};
228
77e54a1f 229#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 230static int min_sched_granularity_ns = 100000; /* 100 usecs */
231static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
232static int min_wakeup_granularity_ns; /* 0 usecs */
233static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 234#endif
235
d8217f07 236static struct ctl_table kern_table[] = {
77e54a1f
IM		 237#ifdef CONFIG_SCHED_DEBUG
238 {
239 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 240 .procname = "sched_min_granularity_ns",
241 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 242 .maxlen = sizeof(unsigned int),
243 .mode = 0644,
b2be5e96
PZ		 244 .proc_handler = &sched_nr_latency_handler,
245 .strategy = &sysctl_intvec,
246 .extra1 = &min_sched_granularity_ns,
247 .extra2 = &max_sched_granularity_ns,
77e54a1f 248 },
21805085
PZ		 249 {
250 .ctl_name = CTL_UNNUMBERED,
251 .procname = "sched_latency_ns",
252 .data = &sysctl_sched_latency,
253 .maxlen = sizeof(unsigned int),
254 .mode = 0644,
b2be5e96 255 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 256 .strategy = &sysctl_intvec,
257 .extra1 = &min_sched_granularity_ns,
258 .extra2 = &max_sched_granularity_ns,
259 },
77e54a1f
IM		 260 {
261 .ctl_name = CTL_UNNUMBERED,
262 .procname = "sched_wakeup_granularity_ns",
263 .data = &sysctl_sched_wakeup_granularity,
264 .maxlen = sizeof(unsigned int),
265 .mode = 0644,
266 .proc_handler = &proc_dointvec_minmax,
267 .strategy = &sysctl_intvec,
268 .extra1 = &min_wakeup_granularity_ns,
269 .extra2 = &max_wakeup_granularity_ns,
270 },
271 {
272 .ctl_name = CTL_UNNUMBERED,
273 .procname = "sched_batch_wakeup_granularity_ns",
274 .data = &sysctl_sched_batch_wakeup_granularity,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
277 .proc_handler = &proc_dointvec_minmax,
278 .strategy = &sysctl_intvec,
279 .extra1 = &min_wakeup_granularity_ns,
280 .extra2 = &max_wakeup_granularity_ns,
281 },
77e54a1f
IM		 282 {
283 .ctl_name = CTL_UNNUMBERED,
284 .procname = "sched_child_runs_first",
285 .data = &sysctl_sched_child_runs_first,
286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
288 .proc_handler = &proc_dointvec,
289 },
1fc84aaa
PZ		 290 {
291 .ctl_name = CTL_UNNUMBERED,
292 .procname = "sched_features",
293 .data = &sysctl_sched_features,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
296 .proc_handler = &proc_dointvec,
297 },
da84d961
IM		 298 {
299 .ctl_name = CTL_UNNUMBERED,
300 .procname = "sched_migration_cost",
301 .data = &sysctl_sched_migration_cost,
302 .maxlen = sizeof(unsigned int),
303 .mode = 0644,
304 .proc_handler = &proc_dointvec,
305 },
b82d9fdd
PZ		 306 {
307 .ctl_name = CTL_UNNUMBERED,
308 .procname = "sched_nr_migrate",
309 .data = &sysctl_sched_nr_migrate,
310 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 311 .mode = 0644,
312 .proc_handler = &proc_dointvec,
313 },
314 {
315 .ctl_name = CTL_UNNUMBERED,
316 .procname = "sched_rt_period_ms",
317 .data = &sysctl_sched_rt_period,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = &proc_dointvec,
321 },
322 {
323 .ctl_name = CTL_UNNUMBERED,
324 .procname = "sched_rt_ratio",
325 .data = &sysctl_sched_rt_ratio,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
b82d9fdd
PZ		 328 .proc_handler = &proc_dointvec,
329 },
6b2d7700
SV		 330#if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
331 {
332 .ctl_name = CTL_UNNUMBERED,
333 .procname = "sched_min_bal_int_shares",
334 .data = &sysctl_sched_min_bal_int_shares,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
337 .proc_handler = &proc_dointvec,
338 },
339 {
340 .ctl_name = CTL_UNNUMBERED,
341 .procname = "sched_max_bal_int_shares",
342 .data = &sysctl_sched_max_bal_int_shares,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = &proc_dointvec,
346 },
347#endif
1fc84aaa 348#endif
1799e35d
IM		 349 {
350 .ctl_name = CTL_UNNUMBERED,
351 .procname = "sched_compat_yield",
352 .data = &sysctl_sched_compat_yield,
353 .maxlen = sizeof(unsigned int),
354 .mode = 0644,
355 .proc_handler = &proc_dointvec,
356 },
f20786ff
PZ		 357#ifdef CONFIG_PROVE_LOCKING
358 {
359 .ctl_name = CTL_UNNUMBERED,
360 .procname = "prove_locking",
361 .data = &prove_locking,
362 .maxlen = sizeof(int),
363 .mode = 0644,
364 .proc_handler = &proc_dointvec,
365 },
366#endif
367#ifdef CONFIG_LOCK_STAT
368 {
369 .ctl_name = CTL_UNNUMBERED,
370 .procname = "lock_stat",
371 .data = &lock_stat,
372 .maxlen = sizeof(int),
373 .mode = 0644,
374 .proc_handler = &proc_dointvec,
375 },
77e54a1f 376#endif
1da177e4
LT		 377 {
378 .ctl_name = KERN_PANIC,
379 .procname = "panic",
380 .data = &panic_timeout,
381 .maxlen = sizeof(int),
382 .mode = 0644,
383 .proc_handler = &proc_dointvec,
384 },
385 {
386 .ctl_name = KERN_CORE_USES_PID,
387 .procname = "core_uses_pid",
388 .data = &core_uses_pid,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = &proc_dointvec,
392 },
393 {
394 .ctl_name = KERN_CORE_PATTERN,
395 .procname = "core_pattern",
396 .data = core_pattern,
71ce92f3 397 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 398 .mode = 0644,
399 .proc_handler = &proc_dostring,
400 .strategy = &sysctl_string,
401 },
34f5a398 402#ifdef CONFIG_PROC_SYSCTL
1da177e4 403 {
1da177e4
LT		 404 .procname = "tainted",
405 .data = &tainted,
406 .maxlen = sizeof(int),
34f5a398
TT		 407 .mode = 0644,
408 .proc_handler = &proc_dointvec_taint,
1da177e4 409 },
34f5a398 410#endif
9745512c
AV		 411#ifdef CONFIG_LATENCYTOP
412 {
413 .procname = "latencytop",
414 .data = &latencytop_enabled,
415 .maxlen = sizeof(int),
416 .mode = 0644,
417 .proc_handler = &proc_dointvec,
418 },
419#endif
1da177e4
LT		 420#ifdef CONFIG_BLK_DEV_INITRD
421 {
422 .ctl_name = KERN_REALROOTDEV,
423 .procname = "real-root-dev",
424 .data = &real_root_dev,
425 .maxlen = sizeof(int),
426 .mode = 0644,
427 .proc_handler = &proc_dointvec,
428 },
429#endif
45807a1d
IM		 430 {
431 .ctl_name = CTL_UNNUMBERED,
432 .procname = "print-fatal-signals",
433 .data = &print_fatal_signals,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = &proc_dointvec,
437 },
1da177e4
LT		 438#ifdef __sparc__
439 {
440 .ctl_name = KERN_SPARC_REBOOT,
441 .procname = "reboot-cmd",
442 .data = reboot_command,
443 .maxlen = 256,
444 .mode = 0644,
445 .proc_handler = &proc_dostring,
446 .strategy = &sysctl_string,
447 },
448 {
449 .ctl_name = KERN_SPARC_STOP_A,
450 .procname = "stop-a",
451 .data = &stop_a_enabled,
452 .maxlen = sizeof (int),
453 .mode = 0644,
454 .proc_handler = &proc_dointvec,
455 },
456 {
457 .ctl_name = KERN_SPARC_SCONS_PWROFF,
458 .procname = "scons-poweroff",
459 .data = &scons_pwroff,
460 .maxlen = sizeof (int),
461 .mode = 0644,
462 .proc_handler = &proc_dointvec,
463 },
464#endif
465#ifdef __hppa__
466 {
467 .ctl_name = KERN_HPPA_PWRSW,
468 .procname = "soft-power",
469 .data = &pwrsw_enabled,
470 .maxlen = sizeof (int),
471 .mode = 0644,
472 .proc_handler = &proc_dointvec,
473 },
474 {
475 .ctl_name = KERN_HPPA_UNALIGNED,
476 .procname = "unaligned-trap",
477 .data = &unaligned_enabled,
478 .maxlen = sizeof (int),
479 .mode = 0644,
480 .proc_handler = &proc_dointvec,
481 },
482#endif
483 {
484 .ctl_name = KERN_CTLALTDEL,
485 .procname = "ctrl-alt-del",
486 .data = &C_A_D,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = &proc_dointvec,
490 },
1da177e4
LT		 491#ifdef CONFIG_KMOD
492 {
493 .ctl_name = KERN_MODPROBE,
494 .procname = "modprobe",
495 .data = &modprobe_path,
496 .maxlen = KMOD_PATH_LEN,
497 .mode = 0644,
498 .proc_handler = &proc_dostring,
499 .strategy = &sysctl_string,
500 },
501#endif
57ae2508 502#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 503 {
504 .ctl_name = KERN_HOTPLUG,
505 .procname = "hotplug",
312c004d
KS		 506 .data = &uevent_helper,
507 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 508 .mode = 0644,
509 .proc_handler = &proc_dostring,
510 .strategy = &sysctl_string,
511 },
512#endif
513#ifdef CONFIG_CHR_DEV_SG
514 {
515 .ctl_name = KERN_SG_BIG_BUFF,
516 .procname = "sg-big-buff",
517 .data = &sg_big_buff,
518 .maxlen = sizeof (int),
519 .mode = 0444,
520 .proc_handler = &proc_dointvec,
521 },
522#endif
523#ifdef CONFIG_BSD_PROCESS_ACCT
524 {
525 .ctl_name = KERN_ACCT,
526 .procname = "acct",
527 .data = &acct_parm,
528 .maxlen = 3*sizeof(int),
529 .mode = 0644,
530 .proc_handler = &proc_dointvec,
531 },
532#endif
1da177e4
LT		 533#ifdef CONFIG_MAGIC_SYSRQ
534 {
535 .ctl_name = KERN_SYSRQ,
536 .procname = "sysrq",
5d6f647f 537 .data = &__sysrq_enabled,
1da177e4
LT		 538 .maxlen = sizeof (int),
539 .mode = 0644,
540 .proc_handler = &proc_dointvec,
541 },
542#endif
d6f8ff73 543#ifdef CONFIG_PROC_SYSCTL
1da177e4 544 {
1da177e4 545 .procname = "cad_pid",
9ec52099 546 .data = NULL,
1da177e4
LT		 547 .maxlen = sizeof (int),
548 .mode = 0600,
9ec52099 549 .proc_handler = &proc_do_cad_pid,
1da177e4 550 },
d6f8ff73 551#endif
1da177e4
LT		 552 {
553 .ctl_name = KERN_MAX_THREADS,
554 .procname = "threads-max",
555 .data = &max_threads,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = &proc_dointvec,
559 },
560 {
561 .ctl_name = KERN_RANDOM,
562 .procname = "random",
563 .mode = 0555,
564 .child = random_table,
565 },
1da177e4
LT		 566 {
567 .ctl_name = KERN_OVERFLOWUID,
568 .procname = "overflowuid",
569 .data = &overflowuid,
570 .maxlen = sizeof(int),
571 .mode = 0644,
572 .proc_handler = &proc_dointvec_minmax,
573 .strategy = &sysctl_intvec,
574 .extra1 = &minolduid,
575 .extra2 = &maxolduid,
576 },
577 {
578 .ctl_name = KERN_OVERFLOWGID,
579 .procname = "overflowgid",
580 .data = &overflowgid,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = &proc_dointvec_minmax,
584 .strategy = &sysctl_intvec,
585 .extra1 = &minolduid,
586 .extra2 = &maxolduid,
587 },
347a8dc3 588#ifdef CONFIG_S390
1da177e4
LT		 589#ifdef CONFIG_MATHEMU
590 {
591 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
592 .procname = "ieee_emulation_warnings",
593 .data = &sysctl_ieee_emulation_warnings,
594 .maxlen = sizeof(int),
595 .mode = 0644,
596 .proc_handler = &proc_dointvec,
597 },
598#endif
599#ifdef CONFIG_NO_IDLE_HZ
600 {
601 .ctl_name = KERN_HZ_TIMER,
602 .procname = "hz_timer",
603 .data = &sysctl_hz_timer,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = &proc_dointvec,
607 },
608#endif
609 {
610 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
611 .procname = "userprocess_debug",
612 .data = &sysctl_userprocess_debug,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = &proc_dointvec,
616 },
617#endif
618 {
619 .ctl_name = KERN_PIDMAX,
620 .procname = "pid_max",
621 .data = &pid_max,
622 .maxlen = sizeof (int),
623 .mode = 0644,
624 .proc_handler = &proc_dointvec_minmax,
625 .strategy = sysctl_intvec,
626 .extra1 = &pid_max_min,
627 .extra2 = &pid_max_max,
628 },
629 {
630 .ctl_name = KERN_PANIC_ON_OOPS,
631 .procname = "panic_on_oops",
632 .data = &panic_on_oops,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 .proc_handler = &proc_dointvec,
636 },
7ef3d2fd
JP		 637#if defined CONFIG_PRINTK
638 {
639 .ctl_name = KERN_PRINTK,
640 .procname = "printk",
641 .data = &console_loglevel,
642 .maxlen = 4*sizeof(int),
643 .mode = 0644,
644 .proc_handler = &proc_dointvec,
645 },
1da177e4
LT		 646 {
647 .ctl_name = KERN_PRINTK_RATELIMIT,
648 .procname = "printk_ratelimit",
649 .data = &printk_ratelimit_jiffies,
650 .maxlen = sizeof(int),
651 .mode = 0644,
652 .proc_handler = &proc_dointvec_jiffies,
653 .strategy = &sysctl_jiffies,
654 },
655 {
656 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
657 .procname = "printk_ratelimit_burst",
658 .data = &printk_ratelimit_burst,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = &proc_dointvec,
662 },
7ef3d2fd 663#endif
1da177e4
LT		 664 {
665 .ctl_name = KERN_NGROUPS_MAX,
666 .procname = "ngroups_max",
667 .data = &ngroups_max,
668 .maxlen = sizeof (int),
669 .mode = 0444,
670 .proc_handler = &proc_dointvec,
671 },
672#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
673 {
674 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
675 .procname = "unknown_nmi_panic",
676 .data = &unknown_nmi_panic,
677 .maxlen = sizeof (int),
678 .mode = 0644,
2fbe7b25 679 .proc_handler = &proc_dointvec,
1da177e4 680 },
407984f1 681 {
407984f1
DZ		 682 .procname = "nmi_watchdog",
683 .data = &nmi_watchdog_enabled,
684 .maxlen = sizeof (int),
685 .mode = 0644,
686 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 687 },
688#endif
689#if defined(CONFIG_X86)
8da5adda
DZ		 690 {
691 .ctl_name = KERN_PANIC_ON_NMI,
692 .procname = "panic_on_unrecovered_nmi",
693 .data = &panic_on_unrecovered_nmi,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = &proc_dointvec,
697 },
1da177e4
LT		 698 {
699 .ctl_name = KERN_BOOTLOADER_TYPE,
700 .procname = "bootloader_type",
701 .data = &bootloader_type,
702 .maxlen = sizeof (int),
703 .mode = 0444,
704 .proc_handler = &proc_dointvec,
705 },
0741f4d2
CE		 706 {
707 .ctl_name = CTL_UNNUMBERED,
708 .procname = "kstack_depth_to_print",
709 .data = &kstack_depth_to_print,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = &proc_dointvec,
713 },
6e7c4025
IM		 714 {
715 .ctl_name = CTL_UNNUMBERED,
716 .procname = "io_delay_type",
717 .data = &io_delay_type,
718 .maxlen = sizeof(int),
719 .mode = 0644,
720 .proc_handler = &proc_dointvec,
721 },
1da177e4 722#endif
7a9166e3 723#if defined(CONFIG_MMU)
1da177e4
LT		 724 {
725 .ctl_name = KERN_RANDOMIZE,
726 .procname = "randomize_va_space",
727 .data = &randomize_va_space,
728 .maxlen = sizeof(int),
729 .mode = 0644,
730 .proc_handler = &proc_dointvec,
731 },
7a9166e3 732#endif
0152fb37 733#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 734 {
735 .ctl_name = KERN_SPIN_RETRY,
736 .procname = "spin_retry",
737 .data = &spin_retry,
738 .maxlen = sizeof (int),
739 .mode = 0644,
740 .proc_handler = &proc_dointvec,
741 },
c255d844 742#endif
673d5b43 743#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 744 {
c255d844 745 .procname = "acpi_video_flags",
77afcf78 746 .data = &acpi_realmode_flags,
c255d844
PM		 747 .maxlen = sizeof (unsigned long),
748 .mode = 0644,
7f99f06f 749 .proc_handler = &proc_doulongvec_minmax,
c255d844 750 },
d2b176ed
JS		 751#endif
752#ifdef CONFIG_IA64
753 {
754 .ctl_name = KERN_IA64_UNALIGNED,
755 .procname = "ignore-unaligned-usertrap",
756 .data = &no_unaligned_warning,
757 .maxlen = sizeof (int),
758 .mode = 0644,
759 .proc_handler = &proc_dointvec,
760 },
bebfa101 761#endif
c4f3b63f
RT		 762#ifdef CONFIG_DETECT_SOFTLOCKUP
763 {
764 .ctl_name = CTL_UNNUMBERED,
765 .procname = "softlockup_thresh",
766 .data = &softlockup_thresh,
90739081 767 .maxlen = sizeof(unsigned long),
c4f3b63f 768 .mode = 0644,
90739081 769 .proc_handler = &proc_doulongvec_minmax,
c4f3b63f
RT		 770 .strategy = &sysctl_intvec,
771 .extra1 = &one,
772 .extra2 = &sixty,
773 },
82a1fcb9
IM		 774 {
775 .ctl_name = CTL_UNNUMBERED,
776 .procname = "hung_task_check_count",
777 .data = &sysctl_hung_task_check_count,
90739081 778 .maxlen = sizeof(unsigned long),
82a1fcb9 779 .mode = 0644,
90739081 780 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 781 .strategy = &sysctl_intvec,
782 },
783 {
784 .ctl_name = CTL_UNNUMBERED,
785 .procname = "hung_task_timeout_secs",
786 .data = &sysctl_hung_task_timeout_secs,
90739081 787 .maxlen = sizeof(unsigned long),
82a1fcb9 788 .mode = 0644,
90739081 789 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 790 .strategy = &sysctl_intvec,
791 },
792 {
793 .ctl_name = CTL_UNNUMBERED,
794 .procname = "hung_task_warnings",
795 .data = &sysctl_hung_task_warnings,
90739081 796 .maxlen = sizeof(unsigned long),
82a1fcb9 797 .mode = 0644,
90739081 798 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 799 .strategy = &sysctl_intvec,
800 },
c4f3b63f 801#endif
bebfa101
AK		 802#ifdef CONFIG_COMPAT
803 {
804 .ctl_name = KERN_COMPAT_LOG,
805 .procname = "compat-log",
806 .data = &compat_log,
807 .maxlen = sizeof (int),
808 .mode = 0644,
809 .proc_handler = &proc_dointvec,
810 },
951f22d5 811#endif
23f78d4a
IM		 812#ifdef CONFIG_RT_MUTEXES
813 {
814 .ctl_name = KERN_MAX_LOCK_DEPTH,
815 .procname = "max_lock_depth",
816 .data = &max_lock_depth,
817 .maxlen = sizeof(int),
818 .mode = 0644,
819 .proc_handler = &proc_dointvec,
820 },
821#endif
5096add8
KC		 822#ifdef CONFIG_PROC_FS
823 {
824 .ctl_name = CTL_UNNUMBERED,
825 .procname = "maps_protect",
826 .data = &maps_protect,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = &proc_dointvec,
830 },
831#endif
10a0a8d4
JF		 832 {
833 .ctl_name = CTL_UNNUMBERED,
834 .procname = "poweroff_cmd",
835 .data = &poweroff_cmd,
836 .maxlen = POWEROFF_CMD_PATH_LEN,
837 .mode = 0644,
838 .proc_handler = &proc_dostring,
839 .strategy = &sysctl_string,
840 },
ed2c12f3
AM		 841/*
842 * NOTE: do not add new entries to this table unless you have read
843 * Documentation/sysctl/ctl_unnumbered.txt
844 */
1da177e4
LT		 845 { .ctl_name = 0 }
846};
847
d8217f07 848static struct ctl_table vm_table[] = {
1da177e4
LT		 849 {
850 .ctl_name = VM_OVERCOMMIT_MEMORY,
851 .procname = "overcommit_memory",
852 .data = &sysctl_overcommit_memory,
853 .maxlen = sizeof(sysctl_overcommit_memory),
854 .mode = 0644,
855 .proc_handler = &proc_dointvec,
856 },
fadd8fbd
KH		 857 {
858 .ctl_name = VM_PANIC_ON_OOM,
859 .procname = "panic_on_oom",
860 .data = &sysctl_panic_on_oom,
861 .maxlen = sizeof(sysctl_panic_on_oom),
862 .mode = 0644,
863 .proc_handler = &proc_dointvec,
864 },
fe071d7e
DR		 865 {
866 .ctl_name = CTL_UNNUMBERED,
867 .procname = "oom_kill_allocating_task",
868 .data = &sysctl_oom_kill_allocating_task,
869 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
870 .mode = 0644,
871 .proc_handler = &proc_dointvec,
872 },
fef1bdd6
DR		 873 {
874 .ctl_name = CTL_UNNUMBERED,
875 .procname = "oom_dump_tasks",
876 .data = &sysctl_oom_dump_tasks,
877 .maxlen = sizeof(sysctl_oom_dump_tasks),
878 .mode = 0644,
879 .proc_handler = &proc_dointvec,
880 },
1da177e4
LT		 881 {
882 .ctl_name = VM_OVERCOMMIT_RATIO,
883 .procname = "overcommit_ratio",
884 .data = &sysctl_overcommit_ratio,
885 .maxlen = sizeof(sysctl_overcommit_ratio),
886 .mode = 0644,
887 .proc_handler = &proc_dointvec,
888 },
889 {
890 .ctl_name = VM_PAGE_CLUSTER,
891 .procname = "page-cluster",
892 .data = &page_cluster,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = &proc_dointvec,
896 },
897 {
898 .ctl_name = VM_DIRTY_BACKGROUND,
899 .procname = "dirty_background_ratio",
900 .data = &dirty_background_ratio,
901 .maxlen = sizeof(dirty_background_ratio),
902 .mode = 0644,
903 .proc_handler = &proc_dointvec_minmax,
904 .strategy = &sysctl_intvec,
905 .extra1 = &zero,
906 .extra2 = &one_hundred,
907 },
908 {
909 .ctl_name = VM_DIRTY_RATIO,
910 .procname = "dirty_ratio",
911 .data = &vm_dirty_ratio,
912 .maxlen = sizeof(vm_dirty_ratio),
913 .mode = 0644,
04fbfdc1 914 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 915 .strategy = &sysctl_intvec,
916 .extra1 = &zero,
917 .extra2 = &one_hundred,
918 },
919 {
1da177e4 920 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 921 .data = &dirty_writeback_interval,
922 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 923 .mode = 0644,
924 .proc_handler = &dirty_writeback_centisecs_handler,
925 },
926 {
1da177e4 927 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 928 .data = &dirty_expire_interval,
929 .maxlen = sizeof(dirty_expire_interval),
1da177e4 930 .mode = 0644,
f6ef9438 931 .proc_handler = &proc_dointvec_userhz_jiffies,
1da177e4
LT		 932 },
933 {
934 .ctl_name = VM_NR_PDFLUSH_THREADS,
935 .procname = "nr_pdflush_threads",
936 .data = &nr_pdflush_threads,
937 .maxlen = sizeof nr_pdflush_threads,
938 .mode = 0444 /* read-only*/,
939 .proc_handler = &proc_dointvec,
940 },
941 {
942 .ctl_name = VM_SWAPPINESS,
943 .procname = "swappiness",
944 .data = &vm_swappiness,
945 .maxlen = sizeof(vm_swappiness),
946 .mode = 0644,
947 .proc_handler = &proc_dointvec_minmax,
948 .strategy = &sysctl_intvec,
949 .extra1 = &zero,
950 .extra2 = &one_hundred,
951 },
952#ifdef CONFIG_HUGETLB_PAGE
953 {
1da177e4
LT		 954 .procname = "nr_hugepages",
955 .data = &max_huge_pages,
956 .maxlen = sizeof(unsigned long),
957 .mode = 0644,
958 .proc_handler = &hugetlb_sysctl_handler,
959 .extra1 = (void *)&hugetlb_zero,
960 .extra2 = (void *)&hugetlb_infinity,
961 },
962 {
963 .ctl_name = VM_HUGETLB_GROUP,
964 .procname = "hugetlb_shm_group",
965 .data = &sysctl_hugetlb_shm_group,
966 .maxlen = sizeof(gid_t),
967 .mode = 0644,
968 .proc_handler = &proc_dointvec,
969 },
396faf03
MG		 970 {
971 .ctl_name = CTL_UNNUMBERED,
972 .procname = "hugepages_treat_as_movable",
973 .data = &hugepages_treat_as_movable,
974 .maxlen = sizeof(int),
975 .mode = 0644,
976 .proc_handler = &hugetlb_treat_movable_handler,
977 },
d1c3fb1f
NA		 978 {
979 .ctl_name = CTL_UNNUMBERED,
980 .procname = "nr_overcommit_hugepages",
981 .data = &nr_overcommit_huge_pages,
982 .maxlen = sizeof(nr_overcommit_huge_pages),
983 .mode = 0644,
a3d0c6aa 984 .proc_handler = &hugetlb_overcommit_handler,
d1c3fb1f 985 },
1da177e4
LT		 986#endif
987 {
988 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
989 .procname = "lowmem_reserve_ratio",
990 .data = &sysctl_lowmem_reserve_ratio,
991 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
992 .mode = 0644,
993 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
994 .strategy = &sysctl_intvec,
995 },
9d0243bc
AM		 996 {
997 .ctl_name = VM_DROP_PAGECACHE,
998 .procname = "drop_caches",
999 .data = &sysctl_drop_caches,
1000 .maxlen = sizeof(int),
1001 .mode = 0644,
1002 .proc_handler = drop_caches_sysctl_handler,
1003 .strategy = &sysctl_intvec,
1004 },
1da177e4
LT		 1005 {
1006 .ctl_name = VM_MIN_FREE_KBYTES,
1007 .procname = "min_free_kbytes",
1008 .data = &min_free_kbytes,
1009 .maxlen = sizeof(min_free_kbytes),
1010 .mode = 0644,
1011 .proc_handler = &min_free_kbytes_sysctl_handler,
1012 .strategy = &sysctl_intvec,
1013 .extra1 = &zero,
1014 },
8ad4b1fb
RS		 1015 {
1016 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1017 .procname = "percpu_pagelist_fraction",
1018 .data = &percpu_pagelist_fraction,
1019 .maxlen = sizeof(percpu_pagelist_fraction),
1020 .mode = 0644,
1021 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1022 .strategy = &sysctl_intvec,
1023 .extra1 = &min_percpu_pagelist_fract,
1024 },
1da177e4
LT		 1025#ifdef CONFIG_MMU
1026 {
1027 .ctl_name = VM_MAX_MAP_COUNT,
1028 .procname = "max_map_count",
1029 .data = &sysctl_max_map_count,
1030 .maxlen = sizeof(sysctl_max_map_count),
1031 .mode = 0644,
1032 .proc_handler = &proc_dointvec
1033 },
1034#endif
1035 {
1036 .ctl_name = VM_LAPTOP_MODE,
1037 .procname = "laptop_mode",
1038 .data = &laptop_mode,
1039 .maxlen = sizeof(laptop_mode),
1040 .mode = 0644,
ed5b43f1
BS		 1041 .proc_handler = &proc_dointvec_jiffies,
1042 .strategy = &sysctl_jiffies,
1da177e4
LT		 1043 },
1044 {
1045 .ctl_name = VM_BLOCK_DUMP,
1046 .procname = "block_dump",
1047 .data = &block_dump,
1048 .maxlen = sizeof(block_dump),
1049 .mode = 0644,
1050 .proc_handler = &proc_dointvec,
1051 .strategy = &sysctl_intvec,
1052 .extra1 = &zero,
1053 },
1054 {
1055 .ctl_name = VM_VFS_CACHE_PRESSURE,
1056 .procname = "vfs_cache_pressure",
1057 .data = &sysctl_vfs_cache_pressure,
1058 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1059 .mode = 0644,
1060 .proc_handler = &proc_dointvec,
1061 .strategy = &sysctl_intvec,
1062 .extra1 = &zero,
1063 },
1064#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1065 {
1066 .ctl_name = VM_LEGACY_VA_LAYOUT,
1067 .procname = "legacy_va_layout",
1068 .data = &sysctl_legacy_va_layout,
1069 .maxlen = sizeof(sysctl_legacy_va_layout),
1070 .mode = 0644,
1071 .proc_handler = &proc_dointvec,
1072 .strategy = &sysctl_intvec,
1073 .extra1 = &zero,
1074 },
1075#endif
1743660b
CL		 1076#ifdef CONFIG_NUMA
1077 {
1078 .ctl_name = VM_ZONE_RECLAIM_MODE,
1079 .procname = "zone_reclaim_mode",
1080 .data = &zone_reclaim_mode,
1081 .maxlen = sizeof(zone_reclaim_mode),
1082 .mode = 0644,
1083 .proc_handler = &proc_dointvec,
c84db23c
CL		 1084 .strategy = &sysctl_intvec,
1085 .extra1 = &zero,
1743660b 1086 },
9614634f
CL		 1087 {
1088 .ctl_name = VM_MIN_UNMAPPED,
1089 .procname = "min_unmapped_ratio",
1090 .data = &sysctl_min_unmapped_ratio,
1091 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1092 .mode = 0644,
1093 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1094 .strategy = &sysctl_intvec,
1095 .extra1 = &zero,
1096 .extra2 = &one_hundred,
1097 },
0ff38490
CL		 1098 {
1099 .ctl_name = VM_MIN_SLAB,
1100 .procname = "min_slab_ratio",
1101 .data = &sysctl_min_slab_ratio,
1102 .maxlen = sizeof(sysctl_min_slab_ratio),
1103 .mode = 0644,
1104 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1105 .strategy = &sysctl_intvec,
1106 .extra1 = &zero,
1107 .extra2 = &one_hundred,
1108 },
e6e5494c 1109#endif
77461ab3
CL		 1110#ifdef CONFIG_SMP
1111 {
1112 .ctl_name = CTL_UNNUMBERED,
1113 .procname = "stat_interval",
1114 .data = &sysctl_stat_interval,
1115 .maxlen = sizeof(sysctl_stat_interval),
1116 .mode = 0644,
1117 .proc_handler = &proc_dointvec_jiffies,
1118 .strategy = &sysctl_jiffies,
1119 },
1120#endif
ed032189
EP		 1121#ifdef CONFIG_SECURITY
1122 {
1123 .ctl_name = CTL_UNNUMBERED,
1124 .procname = "mmap_min_addr",
1125 .data = &mmap_min_addr,
1126 .maxlen = sizeof(unsigned long),
1127 .mode = 0644,
1128 .proc_handler = &proc_doulongvec_minmax,
1129 },
8daec965 1130#endif
f0c0b2b8
KH		 1131#ifdef CONFIG_NUMA
1132 {
1133 .ctl_name = CTL_UNNUMBERED,
1134 .procname = "numa_zonelist_order",
1135 .data = &numa_zonelist_order,
1136 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1137 .mode = 0644,
1138 .proc_handler = &numa_zonelist_order_handler,
1139 .strategy = &sysctl_string,
1140 },
1141#endif
2b8232ce 1142#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1143 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1144 {
1145 .ctl_name = VM_VDSO_ENABLED,
1146 .procname = "vdso_enabled",
1147 .data = &vdso_enabled,
1148 .maxlen = sizeof(vdso_enabled),
1149 .mode = 0644,
1150 .proc_handler = &proc_dointvec,
1151 .strategy = &sysctl_intvec,
1152 .extra1 = &zero,
1153 },
1da177e4 1154#endif
195cf453
BG		 1155#ifdef CONFIG_HIGHMEM
1156 {
1157 .ctl_name = CTL_UNNUMBERED,
1158 .procname = "highmem_is_dirtyable",
1159 .data = &vm_highmem_is_dirtyable,
1160 .maxlen = sizeof(vm_highmem_is_dirtyable),
1161 .mode = 0644,
1162 .proc_handler = &proc_dointvec_minmax,
1163 .strategy = &sysctl_intvec,
1164 .extra1 = &zero,
1165 .extra2 = &one,
1166 },
1167#endif
2be7fe07
AM		 1168/*
1169 * NOTE: do not add new entries to this table unless you have read
1170 * Documentation/sysctl/ctl_unnumbered.txt
1171 */
1da177e4
LT		 1172 { .ctl_name = 0 }
1173};
1174
2abc26fc 1175#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1176static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1177 { .ctl_name = 0 }
1178};
1179#endif
1180
d8217f07 1181static struct ctl_table fs_table[] = {
1da177e4
LT		 1182 {
1183 .ctl_name = FS_NRINODE,
1184 .procname = "inode-nr",
1185 .data = &inodes_stat,
1186 .maxlen = 2*sizeof(int),
1187 .mode = 0444,
1188 .proc_handler = &proc_dointvec,
1189 },
1190 {
1191 .ctl_name = FS_STATINODE,
1192 .procname = "inode-state",
1193 .data = &inodes_stat,
1194 .maxlen = 7*sizeof(int),
1195 .mode = 0444,
1196 .proc_handler = &proc_dointvec,
1197 },
1198 {
1da177e4
LT		 1199 .procname = "file-nr",
1200 .data = &files_stat,
1201 .maxlen = 3*sizeof(int),
1202 .mode = 0444,
529bf6be 1203 .proc_handler = &proc_nr_files,
1da177e4
LT		 1204 },
1205 {
1206 .ctl_name = FS_MAXFILE,
1207 .procname = "file-max",
1208 .data = &files_stat.max_files,
1209 .maxlen = sizeof(int),
1210 .mode = 0644,
1211 .proc_handler = &proc_dointvec,
1212 },
9cfe015a
ED		 1213 {
1214 .ctl_name = CTL_UNNUMBERED,
1215 .procname = "nr_open",
1216 .data = &sysctl_nr_open,
1217 .maxlen = sizeof(int),
1218 .mode = 0644,
1219 .proc_handler = &proc_dointvec,
1220 },
1da177e4
LT		 1221 {
1222 .ctl_name = FS_DENTRY,
1223 .procname = "dentry-state",
1224 .data = &dentry_stat,
1225 .maxlen = 6*sizeof(int),
1226 .mode = 0444,
1227 .proc_handler = &proc_dointvec,
1228 },
1229 {
1230 .ctl_name = FS_OVERFLOWUID,
1231 .procname = "overflowuid",
1232 .data = &fs_overflowuid,
1233 .maxlen = sizeof(int),
1234 .mode = 0644,
1235 .proc_handler = &proc_dointvec_minmax,
1236 .strategy = &sysctl_intvec,
1237 .extra1 = &minolduid,
1238 .extra2 = &maxolduid,
1239 },
1240 {
1241 .ctl_name = FS_OVERFLOWGID,
1242 .procname = "overflowgid",
1243 .data = &fs_overflowgid,
1244 .maxlen = sizeof(int),
1245 .mode = 0644,
1246 .proc_handler = &proc_dointvec_minmax,
1247 .strategy = &sysctl_intvec,
1248 .extra1 = &minolduid,
1249 .extra2 = &maxolduid,
1250 },
1251 {
1252 .ctl_name = FS_LEASES,
1253 .procname = "leases-enable",
1254 .data = &leases_enable,
1255 .maxlen = sizeof(int),
1256 .mode = 0644,
1257 .proc_handler = &proc_dointvec,
1258 },
1259#ifdef CONFIG_DNOTIFY
1260 {
1261 .ctl_name = FS_DIR_NOTIFY,
1262 .procname = "dir-notify-enable",
1263 .data = &dir_notify_enable,
1264 .maxlen = sizeof(int),
1265 .mode = 0644,
1266 .proc_handler = &proc_dointvec,
1267 },
1268#endif
1269#ifdef CONFIG_MMU
1270 {
1271 .ctl_name = FS_LEASE_TIME,
1272 .procname = "lease-break-time",
1273 .data = &lease_break_time,
1274 .maxlen = sizeof(int),
1275 .mode = 0644,
76fdbb25
KH		 1276 .proc_handler = &proc_dointvec_minmax,
1277 .strategy = &sysctl_intvec,
1278 .extra1 = &zero,
1279 .extra2 = &two,
1da177e4
LT		 1280 },
1281 {
1da177e4
LT		 1282 .procname = "aio-nr",
1283 .data = &aio_nr,
1284 .maxlen = sizeof(aio_nr),
1285 .mode = 0444,
d55b5fda 1286 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1287 },
1288 {
1da177e4
LT		 1289 .procname = "aio-max-nr",
1290 .data = &aio_max_nr,
1291 .maxlen = sizeof(aio_max_nr),
1292 .mode = 0644,
d55b5fda 1293 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1294 },
2d9048e2 1295#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1296 {
1297 .ctl_name = FS_INOTIFY,
1298 .procname = "inotify",
1299 .mode = 0555,
1300 .child = inotify_table,
1301 },
1302#endif
1da177e4 1303#endif
d6e71144
AC		 1304 {
1305 .ctl_name = KERN_SETUID_DUMPABLE,
1306 .procname = "suid_dumpable",
1307 .data = &suid_dumpable,
1308 .maxlen = sizeof(int),
1309 .mode = 0644,
1310 .proc_handler = &proc_dointvec,
1311 },
2abc26fc
EB		 1312#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1313 {
1314 .ctl_name = CTL_UNNUMBERED,
1315 .procname = "binfmt_misc",
1316 .mode = 0555,
1317 .child = binfmt_misc_table,
1318 },
1319#endif
2be7fe07
AM		 1320/*
1321 * NOTE: do not add new entries to this table unless you have read
1322 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1323 */
1da177e4
LT		 1324 { .ctl_name = 0 }
1325};
1326
d8217f07 1327static struct ctl_table debug_table[] = {
d0c3d534 1328#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1329 {
1330 .ctl_name = CTL_UNNUMBERED,
1331 .procname = "exception-trace",
1332 .data = &show_unhandled_signals,
1333 .maxlen = sizeof(int),
1334 .mode = 0644,
1335 .proc_handler = proc_dointvec
1336 },
1337#endif
1da177e4
LT		 1338 { .ctl_name = 0 }
1339};
1340
d8217f07 1341static struct ctl_table dev_table[] = {
1da177e4 1342 { .ctl_name = 0 }
0eeca283 1343};
1da177e4 1344
330d57fb
AV		 1345static DEFINE_SPINLOCK(sysctl_lock);
1346
1347/* called under sysctl_lock */
1348static int use_table(struct ctl_table_header *p)
1349{
1350 if (unlikely(p->unregistering))
1351 return 0;
1352 p->used++;
1353 return 1;
1354}
1355
1356/* called under sysctl_lock */
1357static void unuse_table(struct ctl_table_header *p)
1358{
1359 if (!--p->used)
1360 if (unlikely(p->unregistering))
1361 complete(p->unregistering);
1362}
1363
1364/* called under sysctl_lock, will reacquire if has to wait */
1365static void start_unregistering(struct ctl_table_header *p)
1366{
1367 /*
1368 * if p->used is 0, nobody will ever touch that entry again;
1369 * we'll eliminate all paths to it before dropping sysctl_lock
1370 */
1371 if (unlikely(p->used)) {
1372 struct completion wait;
1373 init_completion(&wait);
1374 p->unregistering = &wait;
1375 spin_unlock(&sysctl_lock);
1376 wait_for_completion(&wait);
1377 spin_lock(&sysctl_lock);
1378 }
1379 /*
1380 * do not remove from the list until nobody holds it; walking the
1381 * list in do_sysctl() relies on that.
1382 */
1383 list_del_init(&p->ctl_entry);
1384}
1385
805b5d5e
EB		 1386void sysctl_head_finish(struct ctl_table_header *head)
1387{
1388 if (!head)
1389 return;
1390 spin_lock(&sysctl_lock);
1391 unuse_table(head);
1392 spin_unlock(&sysctl_lock);
1393}
1394
e51b6ba0
EB		 1395static struct list_head *
1396lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1397{
e51b6ba0
EB		 1398 struct list_head *header_list;
1399 header_list = &root->header_list;
1400 if (root->lookup)
1401 header_list = root->lookup(root, namespaces);
1402 return header_list;
1403}
1404
1405struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1406 struct ctl_table_header *prev)
1407{
1408 struct ctl_table_root *root;
1409 struct list_head *header_list;
805b5d5e
EB		 1410 struct ctl_table_header *head;
1411 struct list_head *tmp;
e51b6ba0 1412
805b5d5e
EB		 1413 spin_lock(&sysctl_lock);
1414 if (prev) {
e51b6ba0 1415 head = prev;
805b5d5e
EB		 1416 tmp = &prev->ctl_entry;
1417 unuse_table(prev);
1418 goto next;
1419 }
1420 tmp = &root_table_header.ctl_entry;
1421 for (;;) {
1422 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1423
1424 if (!use_table(head))
1425 goto next;
1426 spin_unlock(&sysctl_lock);
1427 return head;
1428 next:
e51b6ba0 1429 root = head->root;
805b5d5e 1430 tmp = tmp->next;
e51b6ba0
EB		 1431 header_list = lookup_header_list(root, namespaces);
1432 if (tmp != header_list)
1433 continue;
1434
1435 do {
1436 root = list_entry(root->root_list.next,
1437 struct ctl_table_root, root_list);
1438 if (root == &sysctl_table_root)
1439 goto out;
1440 header_list = lookup_header_list(root, namespaces);
1441 } while (list_empty(header_list));
1442 tmp = header_list->next;
805b5d5e 1443 }
e51b6ba0 1444out:
805b5d5e
EB		 1445 spin_unlock(&sysctl_lock);
1446 return NULL;
1447}
1448
e51b6ba0
EB		 1449struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1450{
1451 return __sysctl_head_next(current->nsproxy, prev);
1452}
1453
1454void register_sysctl_root(struct ctl_table_root *root)
1455{
1456 spin_lock(&sysctl_lock);
1457 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1458 spin_unlock(&sysctl_lock);
1459}
1460
b89a8171 1461#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 1462int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1463 void __user *newval, size_t newlen)
1464{
805b5d5e 1465 struct ctl_table_header *head;
330d57fb 1466 int error = -ENOTDIR;
1da177e4
LT		 1467
1468 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1469 return -ENOTDIR;
1470 if (oldval) {
1471 int old_len;
1472 if (!oldlenp || get_user(old_len, oldlenp))
1473 return -EFAULT;
1474 }
330d57fb 1475
805b5d5e
EB		 1476 for (head = sysctl_head_next(NULL); head;
1477 head = sysctl_head_next(head)) {
330d57fb 1478 error = parse_table(name, nlen, oldval, oldlenp,
1f29bcd7 1479 newval, newlen, head->ctl_table);
805b5d5e
EB		 1480 if (error != -ENOTDIR) {
1481 sysctl_head_finish(head);
330d57fb 1482 break;
805b5d5e
EB		 1483 }
1484 }
330d57fb 1485 return error;
1da177e4
LT		 1486}
1487
1488asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1489{
1490 struct __sysctl_args tmp;
1491 int error;
1492
1493 if (copy_from_user(&tmp, args, sizeof(tmp)))
1494 return -EFAULT;
1495
7058cb02
EB		 1496 error = deprecated_sysctl_warning(&tmp);
1497 if (error)
1498 goto out;
1499
1da177e4
LT		 1500 lock_kernel();
1501 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1502 tmp.newval, tmp.newlen);
1503 unlock_kernel();
7058cb02 1504out:
1da177e4
LT		 1505 return error;
1506}
b89a8171 1507#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1508
1509/*
1ff007eb 1510 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1511 * some sysctl variables are readonly even to root.
1512 */
1513
1514static int test_perm(int mode, int op)
1515{
1516 if (!current->euid)
1517 mode >>= 6;
1518 else if (in_egroup_p(0))
1519 mode >>= 3;
1520 if ((mode & op & 0007) == op)
1521 return 0;
1522 return -EACCES;
1523}
1524
d8217f07 1525int sysctl_perm(struct ctl_table *table, int op)
1da177e4
LT		 1526{
1527 int error;
1528 error = security_sysctl(table, op);
1529 if (error)
1530 return error;
1531 return test_perm(table->mode, op);
1532}
1533
b89a8171 1534#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 1535static int parse_table(int __user *name, int nlen,
1536 void __user *oldval, size_t __user *oldlenp,
1537 void __user *newval, size_t newlen,
d8217f07 1538 struct ctl_table *table)
1da177e4
LT		 1539{
1540 int n;
1541repeat:
1542 if (!nlen)
1543 return -ENOTDIR;
1544 if (get_user(n, name))
1545 return -EFAULT;
d99f160a
EB		 1546 for ( ; table->ctl_name || table->procname; table++) {
1547 if (!table->ctl_name)
1548 continue;
6703ddfc 1549 if (n == table->ctl_name) {
1da177e4
LT		 1550 int error;
1551 if (table->child) {
1ff007eb 1552 if (sysctl_perm(table, 001))
1da177e4 1553 return -EPERM;
1da177e4
LT		 1554 name++;
1555 nlen--;
1556 table = table->child;
1557 goto repeat;
1558 }
1559 error = do_sysctl_strategy(table, name, nlen,
1560 oldval, oldlenp,
1f29bcd7 1561 newval, newlen);
1da177e4
LT		 1562 return error;
1563 }
1564 }
1565 return -ENOTDIR;
1566}
1567
1568/* Perform the actual read/write of a sysctl table entry. */
d8217f07 1569int do_sysctl_strategy (struct ctl_table *table,
1da177e4
LT		 1570 int __user *name, int nlen,
1571 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 1572 void __user *newval, size_t newlen)
1da177e4
LT		 1573{
1574 int op = 0, rc;
1da177e4
LT		 1575
1576 if (oldval)
1577 op |= 004;
1578 if (newval)
1579 op |= 002;
1ff007eb 1580 if (sysctl_perm(table, op))
1da177e4
LT		 1581 return -EPERM;
1582
1583 if (table->strategy) {
1584 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1f29bcd7 1585 newval, newlen);
1da177e4
LT		 1586 if (rc < 0)
1587 return rc;
1588 if (rc > 0)
1589 return 0;
1590 }
1591
1592 /* If there is no strategy routine, or if the strategy returns
1593 * zero, proceed with automatic r/w */
1594 if (table->data && table->maxlen) {
49a0c458
EB		 1595 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1596 newval, newlen);
1597 if (rc < 0)
1598 return rc;
1da177e4
LT		 1599 }
1600 return 0;
1601}
b89a8171 1602#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 1603
d912b0cc
EB		 1604static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1605{
1606 for (; table->ctl_name || table->procname; table++) {
1607 table->parent = parent;
1608 if (table->child)
1609 sysctl_set_parent(table, table->child);
1610 }
1611}
1612
1613static __init int sysctl_init(void)
1614{
fc6cd25b 1615 int err;
d912b0cc 1616 sysctl_set_parent(NULL, root_table);
e51b6ba0 1617 err = sysctl_check_table(current->nsproxy, root_table);
d912b0cc
EB		 1618 return 0;
1619}
1620
1621core_initcall(sysctl_init);
1622
1da177e4 1623/**
e51b6ba0
EB		 1624 * __register_sysctl_paths - register a sysctl hierarchy
1625 * @root: List of sysctl headers to register on
1626 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1627 * @path: The path to the directory the sysctl table is in.
1da177e4 1628 * @table: the top-level table structure
1da177e4
LT		 1629 *
1630 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1631 * array. A completely 0 filled entry terminates the table.
1da177e4 1632 *
d8217f07 1633 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1634 *
1635 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1636 * must be unique within that level of sysctl
1637 *
1638 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1639 * enter a sysctl file
1640 *
1641 * data - a pointer to data for use by proc_handler
1642 *
1643 * maxlen - the maximum size in bytes of the data
1644 *
1645 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1646 *
1647 * child - a pointer to the child sysctl table if this entry is a directory, or
1648 * %NULL.
1649 *
1650 * proc_handler - the text handler routine (described below)
1651 *
1652 * strategy - the strategy routine (described below)
1653 *
1654 * de - for internal use by the sysctl routines
1655 *
1656 * extra1, extra2 - extra pointers usable by the proc handler routines
1657 *
1658 * Leaf nodes in the sysctl tree will be represented by a single file
1659 * under /proc; non-leaf nodes will be represented by directories.
1660 *
1661 * sysctl(2) can automatically manage read and write requests through
1662 * the sysctl table. The data and maxlen fields of the ctl_table
1663 * struct enable minimal validation of the values being written to be
1664 * performed, and the mode field allows minimal authentication.
1665 *
1666 * More sophisticated management can be enabled by the provision of a
1667 * strategy routine with the table entry. This will be called before
1668 * any automatic read or write of the data is performed.
1669 *
1670 * The strategy routine may return
1671 *
1672 * < 0 - Error occurred (error is passed to user process)
1673 *
1674 * 0 - OK - proceed with automatic read or write.
1675 *
1676 * > 0 - OK - read or write has been done by the strategy routine, so
1677 * return immediately.
1678 *
1679 * There must be a proc_handler routine for any terminal nodes
1680 * mirrored under /proc/sys (non-terminals are handled by a built-in
1681 * directory handler). Several default handlers are available to
1682 * cover common cases -
1683 *
1684 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1685 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1686 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1687 *
1688 * It is the handler's job to read the input buffer from user memory
1689 * and process it. The handler should return 0 on success.
1690 *
1691 * This routine returns %NULL on a failure to register, and a pointer
1692 * to the table header on success.
1693 */
e51b6ba0
EB		 1694struct ctl_table_header *__register_sysctl_paths(
1695 struct ctl_table_root *root,
1696 struct nsproxy *namespaces,
1697 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1698{
e51b6ba0 1699 struct list_head *header_list;
29e796fd
EB		 1700 struct ctl_table_header *header;
1701 struct ctl_table *new, **prevp;
1702 unsigned int n, npath;
1703
1704 /* Count the path components */
1705 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1706 ;
1707
1708 /*
1709 * For each path component, allocate a 2-element ctl_table array.
1710 * The first array element will be filled with the sysctl entry
1711 * for this, the second will be the sentinel (ctl_name == 0).
1712 *
1713 * We allocate everything in one go so that we don't have to
1714 * worry about freeing additional memory in unregister_sysctl_table.
1715 */
1716 header = kzalloc(sizeof(struct ctl_table_header) +
1717 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1718 if (!header)
1da177e4 1719 return NULL;
29e796fd
EB		 1720
1721 new = (struct ctl_table *) (header + 1);
1722
1723 /* Now connect the dots */
1724 prevp = &header->ctl_table;
1725 for (n = 0; n < npath; ++n, ++path) {
1726 /* Copy the procname */
1727 new->procname = path->procname;
1728 new->ctl_name = path->ctl_name;
1729 new->mode = 0555;
1730
1731 *prevp = new;
1732 prevp = &new->child;
1733
1734 new += 2;
1735 }
1736 *prevp = table;
23eb06de 1737 header->ctl_table_arg = table;
29e796fd
EB		 1738
1739 INIT_LIST_HEAD(&header->ctl_entry);
1740 header->used = 0;
1741 header->unregistering = NULL;
e51b6ba0 1742 header->root = root;
29e796fd 1743 sysctl_set_parent(NULL, header->ctl_table);
e51b6ba0 1744 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1745 kfree(header);
fc6cd25b
EB		 1746 return NULL;
1747 }
330d57fb 1748 spin_lock(&sysctl_lock);
e51b6ba0
EB		 1749 header_list = lookup_header_list(root, namespaces);
1750 list_add_tail(&header->ctl_entry, header_list);
330d57fb 1751 spin_unlock(&sysctl_lock);
29e796fd
EB		 1752
1753 return header;
1754}
1755
e51b6ba0
EB		 1756/**
1757 * register_sysctl_table_path - register a sysctl table hierarchy
1758 * @path: The path to the directory the sysctl table is in.
1759 * @table: the top-level table structure
1760 *
1761 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1762 * array. A completely 0 filled entry terminates the table.
1763 *
1764 * See __register_sysctl_paths for more details.
1765 */
1766struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1767 struct ctl_table *table)
1768{
1769 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1770 path, table);
1771}
1772
29e796fd
EB		 1773/**
1774 * register_sysctl_table - register a sysctl table hierarchy
1775 * @table: the top-level table structure
1776 *
1777 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1778 * array. A completely 0 filled entry terminates the table.
1779 *
1780 * See register_sysctl_paths for more details.
1781 */
1782struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1783{
1784 static const struct ctl_path null_path[] = { {} };
1785
1786 return register_sysctl_paths(null_path, table);
1da177e4
LT		 1787}
1788
1789/**
1790 * unregister_sysctl_table - unregister a sysctl table hierarchy
1791 * @header: the header returned from register_sysctl_table
1792 *
1793 * Unregisters the sysctl table and all children. proc entries may not
1794 * actually be removed until they are no longer used by anyone.
1795 */
1796void unregister_sysctl_table(struct ctl_table_header * header)
1797{
330d57fb 1798 might_sleep();
f1dad166
PE		 1799
1800 if (header == NULL)
1801 return;
1802
330d57fb
AV		 1803 spin_lock(&sysctl_lock);
1804 start_unregistering(header);
330d57fb 1805 spin_unlock(&sysctl_lock);
1da177e4
LT		 1806 kfree(header);
1807}
1808
b89a8171 1809#else /* !CONFIG_SYSCTL */
d8217f07 1810struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 1811{
1812 return NULL;
1813}
1814
29e796fd
EB		 1815struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1816 struct ctl_table *table)
1817{
1818 return NULL;
1819}
1820
b89a8171
EB		 1821void unregister_sysctl_table(struct ctl_table_header * table)
1822{
1823}
1824
1825#endif /* CONFIG_SYSCTL */
1826
1da177e4
LT		 1827/*
1828 * /proc/sys support
1829 */
1830
b89a8171 1831#ifdef CONFIG_PROC_SYSCTL
1da177e4 1832
b1ba4ddd
AB		 1833static int _proc_do_string(void* data, int maxlen, int write,
1834 struct file *filp, void __user *buffer,
1835 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1836{
1837 size_t len;
1838 char __user *p;
1839 char c;
8d060877
ON		 1840
1841 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1842 *lenp = 0;
1843 return 0;
1844 }
8d060877 1845
1da177e4
LT		 1846 if (write) {
1847 len = 0;
1848 p = buffer;
1849 while (len < *lenp) {
1850 if (get_user(c, p++))
1851 return -EFAULT;
1852 if (c == 0 || c == '\n')
1853 break;
1854 len++;
1855 }
f5dd3d6f
SV		 1856 if (len >= maxlen)
1857 len = maxlen-1;
1858 if(copy_from_user(data, buffer, len))
1da177e4 1859 return -EFAULT;
f5dd3d6f 1860 ((char *) data)[len] = 0;
1da177e4
LT		 1861 *ppos += *lenp;
1862 } else {
f5dd3d6f
SV		 1863 len = strlen(data);
1864 if (len > maxlen)
1865 len = maxlen;
8d060877
ON		 1866
1867 if (*ppos > len) {
1868 *lenp = 0;
1869 return 0;
1870 }
1871
1872 data += *ppos;
1873 len -= *ppos;
1874
1da177e4
LT		 1875 if (len > *lenp)
1876 len = *lenp;
1877 if (len)
f5dd3d6f 1878 if(copy_to_user(buffer, data, len))
1da177e4
LT		 1879 return -EFAULT;
1880 if (len < *lenp) {
1881 if(put_user('\n', ((char __user *) buffer) + len))
1882 return -EFAULT;
1883 len++;
1884 }
1885 *lenp = len;
1886 *ppos += len;
1887 }
1888 return 0;
1889}
1890
f5dd3d6f
SV		 1891/**
1892 * proc_dostring - read a string sysctl
1893 * @table: the sysctl table
1894 * @write: %TRUE if this is a write to the sysctl file
1895 * @filp: the file structure
1896 * @buffer: the user buffer
1897 * @lenp: the size of the user buffer
1898 * @ppos: file position
1899 *
1900 * Reads/writes a string from/to the user buffer. If the kernel
1901 * buffer provided is not large enough to hold the string, the
1902 * string is truncated. The copied string is %NULL-terminated.
1903 * If the string is being read by the user process, it is copied
1904 * and a newline '\n' is added. It is truncated if the buffer is
1905 * not large enough.
1906 *
1907 * Returns 0 on success.
1908 */
d8217f07 1909int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 1910 void __user *buffer, size_t *lenp, loff_t *ppos)
1911{
1912 return _proc_do_string(table->data, table->maxlen, write, filp,
1913 buffer, lenp, ppos);
1914}
1915
1da177e4
LT		 1916
1917static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1918 int *valp,
1919 int write, void *data)
1920{
1921 if (write) {
1922 *valp = *negp ? -*lvalp : *lvalp;
1923 } else {
1924 int val = *valp;
1925 if (val < 0) {
1926 *negp = -1;
1927 *lvalp = (unsigned long)-val;
1928 } else {
1929 *negp = 0;
1930 *lvalp = (unsigned long)val;
1931 }
1932 }
1933 return 0;
1934}
1935
d8217f07 1936static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 1937 int write, struct file *filp, void __user *buffer,
1938 size_t *lenp, loff_t *ppos,
1da177e4
LT		 1939 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1940 int write, void *data),
1941 void *data)
1942{
1943#define TMPBUFLEN 21
1944 int *i, vleft, first=1, neg, val;
1945 unsigned long lval;
1946 size_t left, len;
1947
1948 char buf[TMPBUFLEN], *p;
1949 char __user *s = buffer;
1950
fcfbd547 1951 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 1952 (*ppos && !write)) {
1953 *lenp = 0;
1954 return 0;
1955 }
1956
fcfbd547 1957 i = (int *) tbl_data;
1da177e4
LT		 1958 vleft = table->maxlen / sizeof(*i);
1959 left = *lenp;
1960
1961 if (!conv)
1962 conv = do_proc_dointvec_conv;
1963
1964 for (; left && vleft--; i++, first=0) {
1965 if (write) {
1966 while (left) {
1967 char c;
1968 if (get_user(c, s))
1969 return -EFAULT;
1970 if (!isspace(c))
1971 break;
1972 left--;
1973 s++;
1974 }
1975 if (!left)
1976 break;
1977 neg = 0;
1978 len = left;
1979 if (len > sizeof(buf) - 1)
1980 len = sizeof(buf) - 1;
1981 if (copy_from_user(buf, s, len))
1982 return -EFAULT;
1983 buf[len] = 0;
1984 p = buf;
1985 if (*p == '-' && left > 1) {
1986 neg = 1;
bd9b0bac 1987 p++;
1da177e4
LT		 1988 }
1989 if (*p < '0' || *p > '9')
1990 break;
1991
1992 lval = simple_strtoul(p, &p, 0);
1993
1994 len = p-buf;
1995 if ((len < left) && *p && !isspace(*p))
1996 break;
1997 if (neg)
1998 val = -val;
1999 s += len;
2000 left -= len;
2001
2002 if (conv(&neg, &lval, i, 1, data))
2003 break;
2004 } else {
2005 p = buf;
2006 if (!first)
2007 *p++ = '\t';
2008
2009 if (conv(&neg, &lval, i, 0, data))
2010 break;
2011
2012 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2013 len = strlen(buf);
2014 if (len > left)
2015 len = left;
2016 if(copy_to_user(s, buf, len))
2017 return -EFAULT;
2018 left -= len;
2019 s += len;
2020 }
2021 }
2022
2023 if (!write && !first && left) {
2024 if(put_user('\n', s))
2025 return -EFAULT;
2026 left--, s++;
2027 }
2028 if (write) {
2029 while (left) {
2030 char c;
2031 if (get_user(c, s++))
2032 return -EFAULT;
2033 if (!isspace(c))
2034 break;
2035 left--;
2036 }
2037 }
2038 if (write && first)
2039 return -EINVAL;
2040 *lenp -= left;
2041 *ppos += *lenp;
2042 return 0;
2043#undef TMPBUFLEN
2044}
2045
d8217f07 2046static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2047 void __user *buffer, size_t *lenp, loff_t *ppos,
2048 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2049 int write, void *data),
2050 void *data)
2051{
2052 return __do_proc_dointvec(table->data, table, write, filp,
2053 buffer, lenp, ppos, conv, data);
2054}
2055
1da177e4
LT		 2056/**
2057 * proc_dointvec - read a vector of integers
2058 * @table: the sysctl table
2059 * @write: %TRUE if this is a write to the sysctl file
2060 * @filp: the file structure
2061 * @buffer: the user buffer
2062 * @lenp: the size of the user buffer
2063 * @ppos: file position
2064 *
2065 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2066 * values from/to the user buffer, treated as an ASCII string.
2067 *
2068 * Returns 0 on success.
2069 */
d8217f07 2070int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2071 void __user *buffer, size_t *lenp, loff_t *ppos)
2072{
2073 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2074 NULL,NULL);
2075}
2076
2077#define OP_SET 0
2078#define OP_AND 1
34f5a398 2079#define OP_OR 2
1da177e4
LT		 2080
2081static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2082 int *valp,
2083 int write, void *data)
2084{
2085 int op = *(int *)data;
2086 if (write) {
2087 int val = *negp ? -*lvalp : *lvalp;
2088 switch(op) {
2089 case OP_SET: *valp = val; break;
2090 case OP_AND: *valp &= val; break;
34f5a398 2091 case OP_OR: *valp |= val; break;
1da177e4
LT		 2092 }
2093 } else {
2094 int val = *valp;
2095 if (val < 0) {
2096 *negp = -1;
2097 *lvalp = (unsigned long)-val;
2098 } else {
2099 *negp = 0;
2100 *lvalp = (unsigned long)val;
2101 }
2102 }
2103 return 0;
2104}
2105
34f5a398
TT		 2106/*
2107 * Taint values can only be increased
2108 */
d8217f07 2109static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2110 void __user *buffer, size_t *lenp, loff_t *ppos)
2111{
2112 int op;
2113
91fcd412 2114 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2115 return -EPERM;
2116
2117 op = OP_OR;
2118 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2119 do_proc_dointvec_bset_conv,&op);
2120}
2121
1da177e4
LT		 2122struct do_proc_dointvec_minmax_conv_param {
2123 int *min;
2124 int *max;
2125};
2126
2127static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2128 int *valp,
2129 int write, void *data)
2130{
2131 struct do_proc_dointvec_minmax_conv_param *param = data;
2132 if (write) {
2133 int val = *negp ? -*lvalp : *lvalp;
2134 if ((param->min && *param->min > val) ||
2135 (param->max && *param->max < val))
2136 return -EINVAL;
2137 *valp = val;
2138 } else {
2139 int val = *valp;
2140 if (val < 0) {
2141 *negp = -1;
2142 *lvalp = (unsigned long)-val;
2143 } else {
2144 *negp = 0;
2145 *lvalp = (unsigned long)val;
2146 }
2147 }
2148 return 0;
2149}
2150
2151/**
2152 * proc_dointvec_minmax - read a vector of integers with min/max values
2153 * @table: the sysctl table
2154 * @write: %TRUE if this is a write to the sysctl file
2155 * @filp: the file structure
2156 * @buffer: the user buffer
2157 * @lenp: the size of the user buffer
2158 * @ppos: file position
2159 *
2160 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2161 * values from/to the user buffer, treated as an ASCII string.
2162 *
2163 * This routine will ensure the values are within the range specified by
2164 * table->extra1 (min) and table->extra2 (max).
2165 *
2166 * Returns 0 on success.
2167 */
d8217f07 2168int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2169 void __user *buffer, size_t *lenp, loff_t *ppos)
2170{
2171 struct do_proc_dointvec_minmax_conv_param param = {
2172 .min = (int *) table->extra1,
2173 .max = (int *) table->extra2,
2174 };
2175 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2176 do_proc_dointvec_minmax_conv, &param);
2177}
2178
d8217f07 2179static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2180 struct file *filp,
2181 void __user *buffer,
2182 size_t *lenp, loff_t *ppos,
2183 unsigned long convmul,
2184 unsigned long convdiv)
2185{
2186#define TMPBUFLEN 21
2187 unsigned long *i, *min, *max, val;
2188 int vleft, first=1, neg;
2189 size_t len, left;
2190 char buf[TMPBUFLEN], *p;
2191 char __user *s = buffer;
2192
fcfbd547 2193 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2194 (*ppos && !write)) {
2195 *lenp = 0;
2196 return 0;
2197 }
2198
fcfbd547 2199 i = (unsigned long *) data;
1da177e4
LT		 2200 min = (unsigned long *) table->extra1;
2201 max = (unsigned long *) table->extra2;
2202 vleft = table->maxlen / sizeof(unsigned long);
2203 left = *lenp;
2204
2205 for (; left && vleft--; i++, min++, max++, first=0) {
2206 if (write) {
2207 while (left) {
2208 char c;
2209 if (get_user(c, s))
2210 return -EFAULT;
2211 if (!isspace(c))
2212 break;
2213 left--;
2214 s++;
2215 }
2216 if (!left)
2217 break;
2218 neg = 0;
2219 len = left;
2220 if (len > TMPBUFLEN-1)
2221 len = TMPBUFLEN-1;
2222 if (copy_from_user(buf, s, len))
2223 return -EFAULT;
2224 buf[len] = 0;
2225 p = buf;
2226 if (*p == '-' && left > 1) {
2227 neg = 1;
bd9b0bac 2228 p++;
1da177e4
LT		 2229 }
2230 if (*p < '0' || *p > '9')
2231 break;
2232 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2233 len = p-buf;
2234 if ((len < left) && *p && !isspace(*p))
2235 break;
2236 if (neg)
2237 val = -val;
2238 s += len;
2239 left -= len;
2240
2241 if(neg)
2242 continue;
2243 if ((min && val < *min) || (max && val > *max))
2244 continue;
2245 *i = val;
2246 } else {
2247 p = buf;
2248 if (!first)
2249 *p++ = '\t';
2250 sprintf(p, "%lu", convdiv * (*i) / convmul);
2251 len = strlen(buf);
2252 if (len > left)
2253 len = left;
2254 if(copy_to_user(s, buf, len))
2255 return -EFAULT;
2256 left -= len;
2257 s += len;
2258 }
2259 }
2260
2261 if (!write && !first && left) {
2262 if(put_user('\n', s))
2263 return -EFAULT;
2264 left--, s++;
2265 }
2266 if (write) {
2267 while (left) {
2268 char c;
2269 if (get_user(c, s++))
2270 return -EFAULT;
2271 if (!isspace(c))
2272 break;
2273 left--;
2274 }
2275 }
2276 if (write && first)
2277 return -EINVAL;
2278 *lenp -= left;
2279 *ppos += *lenp;
2280 return 0;
2281#undef TMPBUFLEN
2282}
2283
d8217f07 2284static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2285 struct file *filp,
2286 void __user *buffer,
2287 size_t *lenp, loff_t *ppos,
2288 unsigned long convmul,
2289 unsigned long convdiv)
2290{
2291 return __do_proc_doulongvec_minmax(table->data, table, write,
2292 filp, buffer, lenp, ppos, convmul, convdiv);
2293}
2294
1da177e4
LT		 2295/**
2296 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2297 * @table: the sysctl table
2298 * @write: %TRUE if this is a write to the sysctl file
2299 * @filp: the file structure
2300 * @buffer: the user buffer
2301 * @lenp: the size of the user buffer
2302 * @ppos: file position
2303 *
2304 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2305 * values from/to the user buffer, treated as an ASCII string.
2306 *
2307 * This routine will ensure the values are within the range specified by
2308 * table->extra1 (min) and table->extra2 (max).
2309 *
2310 * Returns 0 on success.
2311 */
d8217f07 2312int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2313 void __user *buffer, size_t *lenp, loff_t *ppos)
2314{
2315 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2316}
2317
2318/**
2319 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2320 * @table: the sysctl table
2321 * @write: %TRUE if this is a write to the sysctl file
2322 * @filp: the file structure
2323 * @buffer: the user buffer
2324 * @lenp: the size of the user buffer
2325 * @ppos: file position
2326 *
2327 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2328 * values from/to the user buffer, treated as an ASCII string. The values
2329 * are treated as milliseconds, and converted to jiffies when they are stored.
2330 *
2331 * This routine will ensure the values are within the range specified by
2332 * table->extra1 (min) and table->extra2 (max).
2333 *
2334 * Returns 0 on success.
2335 */
d8217f07 2336int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2337 struct file *filp,
2338 void __user *buffer,
2339 size_t *lenp, loff_t *ppos)
2340{
2341 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2342 lenp, ppos, HZ, 1000l);
2343}
2344
2345
2346static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2347 int *valp,
2348 int write, void *data)
2349{
2350 if (write) {
cba9f33d
BS		 2351 if (*lvalp > LONG_MAX / HZ)
2352 return 1;
1da177e4
LT		 2353 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2354 } else {
2355 int val = *valp;
2356 unsigned long lval;
2357 if (val < 0) {
2358 *negp = -1;
2359 lval = (unsigned long)-val;
2360 } else {
2361 *negp = 0;
2362 lval = (unsigned long)val;
2363 }
2364 *lvalp = lval / HZ;
2365 }
2366 return 0;
2367}
2368
2369static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2370 int *valp,
2371 int write, void *data)
2372{
2373 if (write) {
cba9f33d
BS		 2374 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2375 return 1;
1da177e4
LT		 2376 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2377 } else {
2378 int val = *valp;
2379 unsigned long lval;
2380 if (val < 0) {
2381 *negp = -1;
2382 lval = (unsigned long)-val;
2383 } else {
2384 *negp = 0;
2385 lval = (unsigned long)val;
2386 }
2387 *lvalp = jiffies_to_clock_t(lval);
2388 }
2389 return 0;
2390}
2391
2392static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2393 int *valp,
2394 int write, void *data)
2395{
2396 if (write) {
2397 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2398 } else {
2399 int val = *valp;
2400 unsigned long lval;
2401 if (val < 0) {
2402 *negp = -1;
2403 lval = (unsigned long)-val;
2404 } else {
2405 *negp = 0;
2406 lval = (unsigned long)val;
2407 }
2408 *lvalp = jiffies_to_msecs(lval);
2409 }
2410 return 0;
2411}
2412
2413/**
2414 * proc_dointvec_jiffies - read a vector of integers as seconds
2415 * @table: the sysctl table
2416 * @write: %TRUE if this is a write to the sysctl file
2417 * @filp: the file structure
2418 * @buffer: the user buffer
2419 * @lenp: the size of the user buffer
2420 * @ppos: file position
2421 *
2422 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2423 * values from/to the user buffer, treated as an ASCII string.
2424 * The values read are assumed to be in seconds, and are converted into
2425 * jiffies.
2426 *
2427 * Returns 0 on success.
2428 */
d8217f07 2429int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2430 void __user *buffer, size_t *lenp, loff_t *ppos)
2431{
2432 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2433 do_proc_dointvec_jiffies_conv,NULL);
2434}
2435
2436/**
2437 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2438 * @table: the sysctl table
2439 * @write: %TRUE if this is a write to the sysctl file
2440 * @filp: the file structure
2441 * @buffer: the user buffer
2442 * @lenp: the size of the user buffer
1e5d5331 2443 * @ppos: pointer to the file position
1da177e4
LT		 2444 *
2445 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2446 * values from/to the user buffer, treated as an ASCII string.
2447 * The values read are assumed to be in 1/USER_HZ seconds, and
2448 * are converted into jiffies.
2449 *
2450 * Returns 0 on success.
2451 */
d8217f07 2452int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2453 void __user *buffer, size_t *lenp, loff_t *ppos)
2454{
2455 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2456 do_proc_dointvec_userhz_jiffies_conv,NULL);
2457}
2458
2459/**
2460 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2461 * @table: the sysctl table
2462 * @write: %TRUE if this is a write to the sysctl file
2463 * @filp: the file structure
2464 * @buffer: the user buffer
2465 * @lenp: the size of the user buffer
67be2dd1
MW		 2466 * @ppos: file position
2467 * @ppos: the current position in the file
1da177e4
LT		 2468 *
2469 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2470 * values from/to the user buffer, treated as an ASCII string.
2471 * The values read are assumed to be in 1/1000 seconds, and
2472 * are converted into jiffies.
2473 *
2474 * Returns 0 on success.
2475 */
d8217f07 2476int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2477 void __user *buffer, size_t *lenp, loff_t *ppos)
2478{
2479 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2480 do_proc_dointvec_ms_jiffies_conv, NULL);
2481}
2482
d8217f07 2483static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2484 void __user *buffer, size_t *lenp, loff_t *ppos)
2485{
2486 struct pid *new_pid;
2487 pid_t tmp;
2488 int r;
2489
6c5f3e7b 2490 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2491
2492 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2493 lenp, ppos, NULL, NULL);
2494 if (r || !write)
2495 return r;
2496
2497 new_pid = find_get_pid(tmp);
2498 if (!new_pid)
2499 return -ESRCH;
2500
2501 put_pid(xchg(&cad_pid, new_pid));
2502 return 0;
2503}
2504
1da177e4
LT		 2505#else /* CONFIG_PROC_FS */
2506
d8217f07 2507int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2508 void __user *buffer, size_t *lenp, loff_t *ppos)
2509{
2510 return -ENOSYS;
2511}
2512
d8217f07 2513int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2514 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2515{
2516 return -ENOSYS;
2517}
2518
d8217f07 2519int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2520 void __user *buffer, size_t *lenp, loff_t *ppos)
2521{
2522 return -ENOSYS;
2523}
2524
d8217f07 2525int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2526 void __user *buffer, size_t *lenp, loff_t *ppos)
2527{
2528 return -ENOSYS;
2529}
2530
d8217f07 2531int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2532 void __user *buffer, size_t *lenp, loff_t *ppos)
2533{
2534 return -ENOSYS;
2535}
2536
d8217f07 2537int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2538 void __user *buffer, size_t *lenp, loff_t *ppos)
2539{
2540 return -ENOSYS;
2541}
2542
d8217f07 2543int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2544 void __user *buffer, size_t *lenp, loff_t *ppos)
2545{
2546 return -ENOSYS;
2547}
2548
d8217f07 2549int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2550 struct file *filp,
2551 void __user *buffer,
2552 size_t *lenp, loff_t *ppos)
2553{
2554 return -ENOSYS;
2555}
2556
2557
2558#endif /* CONFIG_PROC_FS */
2559
2560
b89a8171 2561#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2562/*
2563 * General sysctl support routines
2564 */
2565
49a0c458
EB		 2566/* The generic sysctl data routine (used if no strategy routine supplied) */
2567int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2568 void __user *oldval, size_t __user *oldlenp,
2569 void __user *newval, size_t newlen)
2570{
2571 size_t len;
2572
2573 /* Get out of I don't have a variable */
2574 if (!table->data || !table->maxlen)
2575 return -ENOTDIR;
2576
2577 if (oldval && oldlenp) {
2578 if (get_user(len, oldlenp))
2579 return -EFAULT;
2580 if (len) {
2581 if (len > table->maxlen)
2582 len = table->maxlen;
2583 if (copy_to_user(oldval, table->data, len))
2584 return -EFAULT;
2585 if (put_user(len, oldlenp))
2586 return -EFAULT;
2587 }
2588 }
2589
2590 if (newval && newlen) {
2591 if (newlen > table->maxlen)
2592 newlen = table->maxlen;
2593
2594 if (copy_from_user(table->data, newval, newlen))
2595 return -EFAULT;
2596 }
2597 return 1;
2598}
2599
1da177e4 2600/* The generic string strategy routine: */
d8217f07 2601int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2602 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2603 void __user *newval, size_t newlen)
1da177e4 2604{
1da177e4
LT		 2605 if (!table->data || !table->maxlen)
2606 return -ENOTDIR;
2607
2608 if (oldval && oldlenp) {
de9e007d
LT		 2609 size_t bufsize;
2610 if (get_user(bufsize, oldlenp))
1da177e4 2611 return -EFAULT;
de9e007d
LT		 2612 if (bufsize) {
2613 size_t len = strlen(table->data), copied;
2614
2615 /* This shouldn't trigger for a well-formed sysctl */
2616 if (len > table->maxlen)
1da177e4 2617 len = table->maxlen;
de9e007d
LT		 2618
2619 /* Copy up to a max of bufsize-1 bytes of the string */
2620 copied = (len >= bufsize) ? bufsize - 1 : len;
2621
2622 if (copy_to_user(oldval, table->data, copied) ||
2623 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2624 return -EFAULT;
de9e007d 2625 if (put_user(len, oldlenp))
1da177e4
LT		 2626 return -EFAULT;
2627 }
2628 }
2629 if (newval && newlen) {
de9e007d 2630 size_t len = newlen;
1da177e4
LT		 2631 if (len > table->maxlen)
2632 len = table->maxlen;
2633 if(copy_from_user(table->data, newval, len))
2634 return -EFAULT;
2635 if (len == table->maxlen)
2636 len--;
2637 ((char *) table->data)[len] = 0;
2638 }
82c9df82 2639 return 1;
1da177e4
LT		 2640}
2641
2642/*
2643 * This function makes sure that all of the integers in the vector
2644 * are between the minimum and maximum values given in the arrays
2645 * table->extra1 and table->extra2, respectively.
2646 */
d8217f07 2647int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2648 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2649 void __user *newval, size_t newlen)
1da177e4
LT		 2650{
2651
2652 if (newval && newlen) {
2653 int __user *vec = (int __user *) newval;
2654 int *min = (int *) table->extra1;
2655 int *max = (int *) table->extra2;
2656 size_t length;
2657 int i;
2658
2659 if (newlen % sizeof(int) != 0)
2660 return -EINVAL;
2661
2662 if (!table->extra1 && !table->extra2)
2663 return 0;
2664
2665 if (newlen > table->maxlen)
2666 newlen = table->maxlen;
2667 length = newlen / sizeof(int);
2668
2669 for (i = 0; i < length; i++) {
2670 int value;
2671 if (get_user(value, vec + i))
2672 return -EFAULT;
2673 if (min && value < min[i])
2674 return -EINVAL;
2675 if (max && value > max[i])
2676 return -EINVAL;
2677 }
2678 }
2679 return 0;
2680}
2681
2682/* Strategy function to convert jiffies to seconds */
d8217f07 2683int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2684 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2685 void __user *newval, size_t newlen)
1da177e4 2686{
3ee75ac3 2687 if (oldval && oldlenp) {
1da177e4 2688 size_t olen;
3ee75ac3
AD		 2689
2690 if (get_user(olen, oldlenp))
2691 return -EFAULT;
2692 if (olen) {
2693 int val;
2694
2695 if (olen < sizeof(int))
2696 return -EINVAL;
2697
2698 val = *(int *)(table->data) / HZ;
2699 if (put_user(val, (int __user *)oldval))
2700 return -EFAULT;
2701 if (put_user(sizeof(int), oldlenp))
1da177e4 2702 return -EFAULT;
1da177e4 2703 }
1da177e4
LT		 2704 }
2705 if (newval && newlen) {
2706 int new;
2707 if (newlen != sizeof(int))
2708 return -EINVAL;
2709 if (get_user(new, (int __user *)newval))
2710 return -EFAULT;
2711 *(int *)(table->data) = new*HZ;
2712 }
2713 return 1;
2714}
2715
2716/* Strategy function to convert jiffies to seconds */
d8217f07 2717int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2718 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2719 void __user *newval, size_t newlen)
1da177e4 2720{
3ee75ac3 2721 if (oldval && oldlenp) {
1da177e4 2722 size_t olen;
3ee75ac3
AD		 2723
2724 if (get_user(olen, oldlenp))
2725 return -EFAULT;
2726 if (olen) {
2727 int val;
2728
2729 if (olen < sizeof(int))
2730 return -EINVAL;
2731
2732 val = jiffies_to_msecs(*(int *)(table->data));
2733 if (put_user(val, (int __user *)oldval))
2734 return -EFAULT;
2735 if (put_user(sizeof(int), oldlenp))
1da177e4 2736 return -EFAULT;
1da177e4 2737 }
1da177e4
LT		 2738 }
2739 if (newval && newlen) {
2740 int new;
2741 if (newlen != sizeof(int))
2742 return -EINVAL;
2743 if (get_user(new, (int __user *)newval))
2744 return -EFAULT;
2745 *(int *)(table->data) = msecs_to_jiffies(new);
2746 }
2747 return 1;
2748}
2749
c4b8b769 2750
c4b8b769 2751
b89a8171 2752#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 2753
2754
2755asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2756{
0e009be8 2757 struct __sysctl_args tmp;
7058cb02 2758 int error;
0e009be8 2759
0e009be8
EB		 2760 if (copy_from_user(&tmp, args, sizeof(tmp)))
2761 return -EFAULT;
0e009be8 2762
7058cb02 2763 error = deprecated_sysctl_warning(&tmp);
b89a8171 2764
7058cb02
EB		 2765 /* If no error reading the parameters then just -ENOSYS ... */
2766 if (!error)
2767 error = -ENOSYS;
2768
2769 return error;
1da177e4
LT		 2770}
2771
49a0c458
EB		 2772int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2773 void __user *oldval, size_t __user *oldlenp,
2774 void __user *newval, size_t newlen)
2775{
2776 return -ENOSYS;
2777}
2778
d8217f07 2779int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2780 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2781 void __user *newval, size_t newlen)
1da177e4
LT		 2782{
2783 return -ENOSYS;
2784}
2785
d8217f07 2786int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2787 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2788 void __user *newval, size_t newlen)
1da177e4
LT		 2789{
2790 return -ENOSYS;
2791}
2792
d8217f07 2793int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2794 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2795 void __user *newval, size_t newlen)
1da177e4
LT		 2796{
2797 return -ENOSYS;
2798}
2799
d8217f07 2800int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2801 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2802 void __user *newval, size_t newlen)
1da177e4
LT		 2803{
2804 return -ENOSYS;
2805}
2806
b89a8171 2807#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 2808
7058cb02
EB		 2809static int deprecated_sysctl_warning(struct __sysctl_args *args)
2810{
2811 static int msg_count;
2812 int name[CTL_MAXNAME];
2813 int i;
2814
6fc48af8
TH		 2815 /* Check args->nlen. */
2816 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2817 return -ENOTDIR;
2818
7058cb02
EB		 2819 /* Read in the sysctl name for better debug message logging */
2820 for (i = 0; i < args->nlen; i++)
2821 if (get_user(name[i], args->name + i))
2822 return -EFAULT;
2823
2824 /* Ignore accesses to kernel.version */
2825 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2826 return 0;
2827
2828 if (msg_count < 5) {
2829 msg_count++;
2830 printk(KERN_INFO
2831 "warning: process `%s' used the deprecated sysctl "
2832 "system call with ", current->comm);
2833 for (i = 0; i < args->nlen; i++)
2834 printk("%d.", name[i]);
2835 printk("\n");
2836 }
2837 return 0;
2838}
2839
1da177e4
LT		 2840/*
2841 * No sense putting this after each symbol definition, twice,
2842 * exception granted :-)
2843 */
2844EXPORT_SYMBOL(proc_dointvec);
2845EXPORT_SYMBOL(proc_dointvec_jiffies);
2846EXPORT_SYMBOL(proc_dointvec_minmax);
2847EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2848EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2849EXPORT_SYMBOL(proc_dostring);
2850EXPORT_SYMBOL(proc_doulongvec_minmax);
2851EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2852EXPORT_SYMBOL(register_sysctl_table);
29e796fd 2853EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 2854EXPORT_SYMBOL(sysctl_intvec);
2855EXPORT_SYMBOL(sysctl_jiffies);
2856EXPORT_SYMBOL(sysctl_ms_jiffies);
2857EXPORT_SYMBOL(sysctl_string);
49a0c458 2858EXPORT_SYMBOL(sysctl_data);
1da177e4 2859EXPORT_SYMBOL(unregister_sysctl_table);
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