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Merge branch 'sched/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip...
[deliverable/linux.git] / kernel / sysctl.c
CommitLineData
1da177e4
LT		 1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
1da177e4
LT		 21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
26#include <linux/proc_fs.h>
72c2d582 27#include <linux/security.h>
1da177e4
LT		 28#include <linux/ctype.h>
29#include <linux/utsname.h>
1da177e4 30#include <linux/smp_lock.h>
62239ac2 31#include <linux/fs.h>
1da177e4
LT		 32#include <linux/init.h>
33#include <linux/kernel.h>
0296b228 34#include <linux/kobject.h>
20380731 35#include <linux/net.h>
1da177e4
LT		 36#include <linux/sysrq.h>
37#include <linux/highuid.h>
38#include <linux/writeback.h>
39#include <linux/hugetlb.h>
1da177e4 40#include <linux/initrd.h>
0b77f5bf 41#include <linux/key.h>
1da177e4
LT		 42#include <linux/times.h>
43#include <linux/limits.h>
44#include <linux/dcache.h>
45#include <linux/syscalls.h>
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;
fef1bdd6 70extern int sysctl_oom_dump_tasks;
1da177e4 71extern int max_threads;
1da177e4 72extern int core_uses_pid;
d6e71144 73extern int suid_dumpable;
1da177e4 74extern char core_pattern[];
1da177e4
LT		 75extern int pid_max;
76extern int min_free_kbytes;
1da177e4 77extern int pid_max_min, pid_max_max;
9d0243bc 78extern int sysctl_drop_caches;
8ad4b1fb 79extern int percpu_pagelist_fraction;
bebfa101 80extern int compat_log;
5096add8 81extern int maps_protect;
77461ab3 82extern int sysctl_stat_interval;
9745512c 83extern int latencytop_enabled;
eceea0b3 84extern int sysctl_nr_open_min, sysctl_nr_open_max;
1da177e4 85
c4f3b63f 86/* Constants used for minimum and maximum */
195cf453 87#if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
c4f3b63f 88static int one = 1;
195cf453
BG		 89#endif
90
91#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f
RT		 92static int sixty = 60;
93#endif
94
95#ifdef CONFIG_MMU
96static int two = 2;
97#endif
98
99static int zero;
100static int one_hundred = 100;
101
1da177e4
LT		 102/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
103static int maxolduid = 65535;
104static int minolduid;
8ad4b1fb 105static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 106
107static int ngroups_max = NGROUPS_MAX;
108
109#ifdef CONFIG_KMOD
110extern char modprobe_path[];
111#endif
1da177e4
LT		 112#ifdef CONFIG_CHR_DEV_SG
113extern int sg_big_buff;
114#endif
1da177e4
LT		 115
116#ifdef __sparc__
117extern char reboot_command [];
118extern int stop_a_enabled;
119extern int scons_pwroff;
120#endif
121
122#ifdef __hppa__
123extern int pwrsw_enabled;
124extern int unaligned_enabled;
125#endif
126
347a8dc3 127#ifdef CONFIG_S390
1da177e4
LT		 128#ifdef CONFIG_MATHEMU
129extern int sysctl_ieee_emulation_warnings;
130#endif
131extern int sysctl_userprocess_debug;
951f22d5 132extern int spin_retry;
1da177e4
LT		 133#endif
134
135extern int sysctl_hz_timer;
136
137#ifdef CONFIG_BSD_PROCESS_ACCT
138extern int acct_parm[];
139#endif
140
d2b176ed
JS		 141#ifdef CONFIG_IA64
142extern int no_unaligned_warning;
143#endif
144
23f78d4a
IM		 145#ifdef CONFIG_RT_MUTEXES
146extern int max_lock_depth;
147#endif
148
d6f8ff73 149#ifdef CONFIG_PROC_SYSCTL
d8217f07 150static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 151 void __user *buffer, size_t *lenp, loff_t *ppos);
d8217f07 152static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 153 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 154#endif
9ec52099 155
d8217f07 156static struct ctl_table root_table[];
e51b6ba0
EB		 157static struct ctl_table_root sysctl_table_root;
158static struct ctl_table_header root_table_header = {
159 .ctl_table = root_table,
160 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
161 .root = &sysctl_table_root,
162};
163static struct ctl_table_root sysctl_table_root = {
164 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
165 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
166};
1da177e4 167
d8217f07
EB		 168static struct ctl_table kern_table[];
169static struct ctl_table vm_table[];
170static struct ctl_table fs_table[];
171static struct ctl_table debug_table[];
172static struct ctl_table dev_table[];
173extern struct ctl_table random_table[];
2d9048e2 174#ifdef CONFIG_INOTIFY_USER
d8217f07 175extern struct ctl_table inotify_table[];
0399cb08 176#endif
1da177e4
LT		 177
178#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
179int sysctl_legacy_va_layout;
180#endif
181
f20786ff
PZ		 182extern int prove_locking;
183extern int lock_stat;
9bc9a6bd 184
1da177e4
LT		 185/* The default sysctl tables: */
186
d8217f07 187static struct ctl_table root_table[] = {
1da177e4
LT		 188 {
189 .ctl_name = CTL_KERN,
190 .procname = "kernel",
191 .mode = 0555,
192 .child = kern_table,
193 },
194 {
195 .ctl_name = CTL_VM,
196 .procname = "vm",
197 .mode = 0555,
198 .child = vm_table,
199 },
1da177e4
LT		 200 {
201 .ctl_name = CTL_FS,
202 .procname = "fs",
203 .mode = 0555,
204 .child = fs_table,
205 },
206 {
207 .ctl_name = CTL_DEBUG,
208 .procname = "debug",
209 .mode = 0555,
210 .child = debug_table,
211 },
212 {
213 .ctl_name = CTL_DEV,
214 .procname = "dev",
215 .mode = 0555,
216 .child = dev_table,
217 },
2be7fe07
AM		 218/*
219 * NOTE: do not add new entries to this table unless you have read
220 * Documentation/sysctl/ctl_unnumbered.txt
221 */
1da177e4
LT		 222 { .ctl_name = 0 }
223};
224
77e54a1f 225#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 226static int min_sched_granularity_ns = 100000; /* 100 usecs */
227static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
228static int min_wakeup_granularity_ns; /* 0 usecs */
229static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 230#endif
231
d8217f07 232static struct ctl_table kern_table[] = {
77e54a1f
IM		 233#ifdef CONFIG_SCHED_DEBUG
234 {
235 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 236 .procname = "sched_min_granularity_ns",
237 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 238 .maxlen = sizeof(unsigned int),
239 .mode = 0644,
b2be5e96
PZ		 240 .proc_handler = &sched_nr_latency_handler,
241 .strategy = &sysctl_intvec,
242 .extra1 = &min_sched_granularity_ns,
243 .extra2 = &max_sched_granularity_ns,
77e54a1f 244 },
21805085
PZ		 245 {
246 .ctl_name = CTL_UNNUMBERED,
247 .procname = "sched_latency_ns",
248 .data = &sysctl_sched_latency,
249 .maxlen = sizeof(unsigned int),
250 .mode = 0644,
b2be5e96 251 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 252 .strategy = &sysctl_intvec,
253 .extra1 = &min_sched_granularity_ns,
254 .extra2 = &max_sched_granularity_ns,
255 },
77e54a1f
IM		 256 {
257 .ctl_name = CTL_UNNUMBERED,
258 .procname = "sched_wakeup_granularity_ns",
259 .data = &sysctl_sched_wakeup_granularity,
260 .maxlen = sizeof(unsigned int),
261 .mode = 0644,
262 .proc_handler = &proc_dointvec_minmax,
263 .strategy = &sysctl_intvec,
77e54a1f
IM		 264 .extra1 = &min_wakeup_granularity_ns,
265 .extra2 = &max_wakeup_granularity_ns,
266 },
2398f2c6
PZ		 267 {
268 .ctl_name = CTL_UNNUMBERED,
269 .procname = "sched_shares_ratelimit",
270 .data = &sysctl_sched_shares_ratelimit,
271 .maxlen = sizeof(unsigned int),
272 .mode = 0644,
273 .proc_handler = &proc_dointvec,
274 },
77e54a1f
IM		 275 {
276 .ctl_name = CTL_UNNUMBERED,
277 .procname = "sched_child_runs_first",
278 .data = &sysctl_sched_child_runs_first,
279 .maxlen = sizeof(unsigned int),
280 .mode = 0644,
281 .proc_handler = &proc_dointvec,
282 },
1fc84aaa
PZ		 283 {
284 .ctl_name = CTL_UNNUMBERED,
285 .procname = "sched_features",
286 .data = &sysctl_sched_features,
287 .maxlen = sizeof(unsigned int),
288 .mode = 0644,
289 .proc_handler = &proc_dointvec,
290 },
da84d961
IM		 291 {
292 .ctl_name = CTL_UNNUMBERED,
293 .procname = "sched_migration_cost",
294 .data = &sysctl_sched_migration_cost,
295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
297 .proc_handler = &proc_dointvec,
298 },
b82d9fdd
PZ		 299 {
300 .ctl_name = CTL_UNNUMBERED,
301 .procname = "sched_nr_migrate",
302 .data = &sysctl_sched_nr_migrate,
303 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 304 .mode = 0644,
305 .proc_handler = &proc_dointvec,
306 },
1fc84aaa 307#endif
9f0c1e56
PZ		 308 {
309 .ctl_name = CTL_UNNUMBERED,
310 .procname = "sched_rt_period_us",
311 .data = &sysctl_sched_rt_period,
312 .maxlen = sizeof(unsigned int),
313 .mode = 0644,
d0b27fa7 314 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 315 },
316 {
317 .ctl_name = CTL_UNNUMBERED,
318 .procname = "sched_rt_runtime_us",
319 .data = &sysctl_sched_rt_runtime,
320 .maxlen = sizeof(int),
321 .mode = 0644,
d0b27fa7 322 .proc_handler = &sched_rt_handler,
9f0c1e56 323 },
1799e35d
IM		 324 {
325 .ctl_name = CTL_UNNUMBERED,
326 .procname = "sched_compat_yield",
327 .data = &sysctl_sched_compat_yield,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
330 .proc_handler = &proc_dointvec,
331 },
f20786ff
PZ		 332#ifdef CONFIG_PROVE_LOCKING
333 {
334 .ctl_name = CTL_UNNUMBERED,
335 .procname = "prove_locking",
336 .data = &prove_locking,
337 .maxlen = sizeof(int),
338 .mode = 0644,
339 .proc_handler = &proc_dointvec,
340 },
341#endif
342#ifdef CONFIG_LOCK_STAT
343 {
344 .ctl_name = CTL_UNNUMBERED,
345 .procname = "lock_stat",
346 .data = &lock_stat,
347 .maxlen = sizeof(int),
348 .mode = 0644,
349 .proc_handler = &proc_dointvec,
350 },
77e54a1f 351#endif
1da177e4
LT		 352 {
353 .ctl_name = KERN_PANIC,
354 .procname = "panic",
355 .data = &panic_timeout,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = &proc_dointvec,
359 },
360 {
361 .ctl_name = KERN_CORE_USES_PID,
362 .procname = "core_uses_pid",
363 .data = &core_uses_pid,
364 .maxlen = sizeof(int),
365 .mode = 0644,
366 .proc_handler = &proc_dointvec,
367 },
368 {
369 .ctl_name = KERN_CORE_PATTERN,
370 .procname = "core_pattern",
371 .data = core_pattern,
71ce92f3 372 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 373 .mode = 0644,
374 .proc_handler = &proc_dostring,
375 .strategy = &sysctl_string,
376 },
34f5a398 377#ifdef CONFIG_PROC_SYSCTL
1da177e4 378 {
1da177e4
LT		 379 .procname = "tainted",
380 .data = &tainted,
381 .maxlen = sizeof(int),
34f5a398
TT		 382 .mode = 0644,
383 .proc_handler = &proc_dointvec_taint,
1da177e4 384 },
34f5a398 385#endif
9745512c
AV		 386#ifdef CONFIG_LATENCYTOP
387 {
388 .procname = "latencytop",
389 .data = &latencytop_enabled,
390 .maxlen = sizeof(int),
391 .mode = 0644,
392 .proc_handler = &proc_dointvec,
393 },
394#endif
1da177e4
LT		 395#ifdef CONFIG_BLK_DEV_INITRD
396 {
397 .ctl_name = KERN_REALROOTDEV,
398 .procname = "real-root-dev",
399 .data = &real_root_dev,
400 .maxlen = sizeof(int),
401 .mode = 0644,
402 .proc_handler = &proc_dointvec,
403 },
404#endif
45807a1d
IM		 405 {
406 .ctl_name = CTL_UNNUMBERED,
407 .procname = "print-fatal-signals",
408 .data = &print_fatal_signals,
409 .maxlen = sizeof(int),
410 .mode = 0644,
411 .proc_handler = &proc_dointvec,
412 },
1da177e4
LT		 413#ifdef __sparc__
414 {
415 .ctl_name = KERN_SPARC_REBOOT,
416 .procname = "reboot-cmd",
417 .data = reboot_command,
418 .maxlen = 256,
419 .mode = 0644,
420 .proc_handler = &proc_dostring,
421 .strategy = &sysctl_string,
422 },
423 {
424 .ctl_name = KERN_SPARC_STOP_A,
425 .procname = "stop-a",
426 .data = &stop_a_enabled,
427 .maxlen = sizeof (int),
428 .mode = 0644,
429 .proc_handler = &proc_dointvec,
430 },
431 {
432 .ctl_name = KERN_SPARC_SCONS_PWROFF,
433 .procname = "scons-poweroff",
434 .data = &scons_pwroff,
435 .maxlen = sizeof (int),
436 .mode = 0644,
437 .proc_handler = &proc_dointvec,
438 },
439#endif
440#ifdef __hppa__
441 {
442 .ctl_name = KERN_HPPA_PWRSW,
443 .procname = "soft-power",
444 .data = &pwrsw_enabled,
445 .maxlen = sizeof (int),
446 .mode = 0644,
447 .proc_handler = &proc_dointvec,
448 },
449 {
450 .ctl_name = KERN_HPPA_UNALIGNED,
451 .procname = "unaligned-trap",
452 .data = &unaligned_enabled,
453 .maxlen = sizeof (int),
454 .mode = 0644,
455 .proc_handler = &proc_dointvec,
456 },
457#endif
458 {
459 .ctl_name = KERN_CTLALTDEL,
460 .procname = "ctrl-alt-del",
461 .data = &C_A_D,
462 .maxlen = sizeof(int),
463 .mode = 0644,
464 .proc_handler = &proc_dointvec,
465 },
1da177e4
LT		 466#ifdef CONFIG_KMOD
467 {
468 .ctl_name = KERN_MODPROBE,
469 .procname = "modprobe",
470 .data = &modprobe_path,
471 .maxlen = KMOD_PATH_LEN,
472 .mode = 0644,
473 .proc_handler = &proc_dostring,
474 .strategy = &sysctl_string,
475 },
476#endif
57ae2508 477#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 478 {
479 .ctl_name = KERN_HOTPLUG,
480 .procname = "hotplug",
312c004d
KS		 481 .data = &uevent_helper,
482 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 483 .mode = 0644,
484 .proc_handler = &proc_dostring,
485 .strategy = &sysctl_string,
486 },
487#endif
488#ifdef CONFIG_CHR_DEV_SG
489 {
490 .ctl_name = KERN_SG_BIG_BUFF,
491 .procname = "sg-big-buff",
492 .data = &sg_big_buff,
493 .maxlen = sizeof (int),
494 .mode = 0444,
495 .proc_handler = &proc_dointvec,
496 },
497#endif
498#ifdef CONFIG_BSD_PROCESS_ACCT
499 {
500 .ctl_name = KERN_ACCT,
501 .procname = "acct",
502 .data = &acct_parm,
503 .maxlen = 3*sizeof(int),
504 .mode = 0644,
505 .proc_handler = &proc_dointvec,
506 },
507#endif
1da177e4
LT		 508#ifdef CONFIG_MAGIC_SYSRQ
509 {
510 .ctl_name = KERN_SYSRQ,
511 .procname = "sysrq",
5d6f647f 512 .data = &__sysrq_enabled,
1da177e4
LT		 513 .maxlen = sizeof (int),
514 .mode = 0644,
515 .proc_handler = &proc_dointvec,
516 },
517#endif
d6f8ff73 518#ifdef CONFIG_PROC_SYSCTL
1da177e4 519 {
1da177e4 520 .procname = "cad_pid",
9ec52099 521 .data = NULL,
1da177e4
LT		 522 .maxlen = sizeof (int),
523 .mode = 0600,
9ec52099 524 .proc_handler = &proc_do_cad_pid,
1da177e4 525 },
d6f8ff73 526#endif
1da177e4
LT		 527 {
528 .ctl_name = KERN_MAX_THREADS,
529 .procname = "threads-max",
530 .data = &max_threads,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = &proc_dointvec,
534 },
535 {
536 .ctl_name = KERN_RANDOM,
537 .procname = "random",
538 .mode = 0555,
539 .child = random_table,
540 },
1da177e4
LT		 541 {
542 .ctl_name = KERN_OVERFLOWUID,
543 .procname = "overflowuid",
544 .data = &overflowuid,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = &proc_dointvec_minmax,
548 .strategy = &sysctl_intvec,
549 .extra1 = &minolduid,
550 .extra2 = &maxolduid,
551 },
552 {
553 .ctl_name = KERN_OVERFLOWGID,
554 .procname = "overflowgid",
555 .data = &overflowgid,
556 .maxlen = sizeof(int),
557 .mode = 0644,
558 .proc_handler = &proc_dointvec_minmax,
559 .strategy = &sysctl_intvec,
560 .extra1 = &minolduid,
561 .extra2 = &maxolduid,
562 },
347a8dc3 563#ifdef CONFIG_S390
1da177e4
LT		 564#ifdef CONFIG_MATHEMU
565 {
566 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
567 .procname = "ieee_emulation_warnings",
568 .data = &sysctl_ieee_emulation_warnings,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 .proc_handler = &proc_dointvec,
572 },
573#endif
574#ifdef CONFIG_NO_IDLE_HZ
575 {
576 .ctl_name = KERN_HZ_TIMER,
577 .procname = "hz_timer",
578 .data = &sysctl_hz_timer,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = &proc_dointvec,
582 },
583#endif
584 {
585 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
586 .procname = "userprocess_debug",
587 .data = &sysctl_userprocess_debug,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = &proc_dointvec,
591 },
592#endif
593 {
594 .ctl_name = KERN_PIDMAX,
595 .procname = "pid_max",
596 .data = &pid_max,
597 .maxlen = sizeof (int),
598 .mode = 0644,
599 .proc_handler = &proc_dointvec_minmax,
600 .strategy = sysctl_intvec,
601 .extra1 = &pid_max_min,
602 .extra2 = &pid_max_max,
603 },
604 {
605 .ctl_name = KERN_PANIC_ON_OOPS,
606 .procname = "panic_on_oops",
607 .data = &panic_on_oops,
608 .maxlen = sizeof(int),
609 .mode = 0644,
610 .proc_handler = &proc_dointvec,
611 },
7ef3d2fd
JP		 612#if defined CONFIG_PRINTK
613 {
614 .ctl_name = KERN_PRINTK,
615 .procname = "printk",
616 .data = &console_loglevel,
617 .maxlen = 4*sizeof(int),
618 .mode = 0644,
619 .proc_handler = &proc_dointvec,
620 },
1da177e4
LT		 621 {
622 .ctl_name = KERN_PRINTK_RATELIMIT,
623 .procname = "printk_ratelimit",
624 .data = &printk_ratelimit_jiffies,
625 .maxlen = sizeof(int),
626 .mode = 0644,
627 .proc_handler = &proc_dointvec_jiffies,
628 .strategy = &sysctl_jiffies,
629 },
630 {
631 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
632 .procname = "printk_ratelimit_burst",
633 .data = &printk_ratelimit_burst,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = &proc_dointvec,
637 },
7ef3d2fd 638#endif
1da177e4
LT		 639 {
640 .ctl_name = KERN_NGROUPS_MAX,
641 .procname = "ngroups_max",
642 .data = &ngroups_max,
643 .maxlen = sizeof (int),
644 .mode = 0444,
645 .proc_handler = &proc_dointvec,
646 },
647#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
648 {
649 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
650 .procname = "unknown_nmi_panic",
651 .data = &unknown_nmi_panic,
652 .maxlen = sizeof (int),
653 .mode = 0644,
2fbe7b25 654 .proc_handler = &proc_dointvec,
1da177e4 655 },
407984f1 656 {
407984f1
DZ		 657 .procname = "nmi_watchdog",
658 .data = &nmi_watchdog_enabled,
659 .maxlen = sizeof (int),
660 .mode = 0644,
661 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 662 },
663#endif
664#if defined(CONFIG_X86)
8da5adda
DZ		 665 {
666 .ctl_name = KERN_PANIC_ON_NMI,
667 .procname = "panic_on_unrecovered_nmi",
668 .data = &panic_on_unrecovered_nmi,
669 .maxlen = sizeof(int),
670 .mode = 0644,
671 .proc_handler = &proc_dointvec,
672 },
1da177e4
LT		 673 {
674 .ctl_name = KERN_BOOTLOADER_TYPE,
675 .procname = "bootloader_type",
676 .data = &bootloader_type,
677 .maxlen = sizeof (int),
678 .mode = 0444,
679 .proc_handler = &proc_dointvec,
680 },
0741f4d2
CE		 681 {
682 .ctl_name = CTL_UNNUMBERED,
683 .procname = "kstack_depth_to_print",
684 .data = &kstack_depth_to_print,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = &proc_dointvec,
688 },
6e7c4025
IM		 689 {
690 .ctl_name = CTL_UNNUMBERED,
691 .procname = "io_delay_type",
692 .data = &io_delay_type,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = &proc_dointvec,
696 },
1da177e4 697#endif
7a9166e3 698#if defined(CONFIG_MMU)
1da177e4
LT		 699 {
700 .ctl_name = KERN_RANDOMIZE,
701 .procname = "randomize_va_space",
702 .data = &randomize_va_space,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = &proc_dointvec,
706 },
7a9166e3 707#endif
0152fb37 708#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 709 {
710 .ctl_name = KERN_SPIN_RETRY,
711 .procname = "spin_retry",
712 .data = &spin_retry,
713 .maxlen = sizeof (int),
714 .mode = 0644,
715 .proc_handler = &proc_dointvec,
716 },
c255d844 717#endif
673d5b43 718#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 719 {
c255d844 720 .procname = "acpi_video_flags",
77afcf78 721 .data = &acpi_realmode_flags,
c255d844
PM		 722 .maxlen = sizeof (unsigned long),
723 .mode = 0644,
7f99f06f 724 .proc_handler = &proc_doulongvec_minmax,
c255d844 725 },
d2b176ed
JS		 726#endif
727#ifdef CONFIG_IA64
728 {
729 .ctl_name = KERN_IA64_UNALIGNED,
730 .procname = "ignore-unaligned-usertrap",
731 .data = &no_unaligned_warning,
732 .maxlen = sizeof (int),
733 .mode = 0644,
734 .proc_handler = &proc_dointvec,
735 },
bebfa101 736#endif
c4f3b63f
RT		 737#ifdef CONFIG_DETECT_SOFTLOCKUP
738 {
739 .ctl_name = CTL_UNNUMBERED,
740 .procname = "softlockup_thresh",
741 .data = &softlockup_thresh,
90739081 742 .maxlen = sizeof(unsigned long),
c4f3b63f 743 .mode = 0644,
90739081 744 .proc_handler = &proc_doulongvec_minmax,
c4f3b63f
RT		 745 .strategy = &sysctl_intvec,
746 .extra1 = &one,
747 .extra2 = &sixty,
748 },
82a1fcb9
IM		 749 {
750 .ctl_name = CTL_UNNUMBERED,
751 .procname = "hung_task_check_count",
752 .data = &sysctl_hung_task_check_count,
90739081 753 .maxlen = sizeof(unsigned long),
82a1fcb9 754 .mode = 0644,
90739081 755 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 756 .strategy = &sysctl_intvec,
757 },
758 {
759 .ctl_name = CTL_UNNUMBERED,
760 .procname = "hung_task_timeout_secs",
761 .data = &sysctl_hung_task_timeout_secs,
90739081 762 .maxlen = sizeof(unsigned long),
82a1fcb9 763 .mode = 0644,
90739081 764 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 765 .strategy = &sysctl_intvec,
766 },
767 {
768 .ctl_name = CTL_UNNUMBERED,
769 .procname = "hung_task_warnings",
770 .data = &sysctl_hung_task_warnings,
90739081 771 .maxlen = sizeof(unsigned long),
82a1fcb9 772 .mode = 0644,
90739081 773 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 774 .strategy = &sysctl_intvec,
775 },
c4f3b63f 776#endif
bebfa101
AK		 777#ifdef CONFIG_COMPAT
778 {
779 .ctl_name = KERN_COMPAT_LOG,
780 .procname = "compat-log",
781 .data = &compat_log,
782 .maxlen = sizeof (int),
783 .mode = 0644,
784 .proc_handler = &proc_dointvec,
785 },
951f22d5 786#endif
23f78d4a
IM		 787#ifdef CONFIG_RT_MUTEXES
788 {
789 .ctl_name = KERN_MAX_LOCK_DEPTH,
790 .procname = "max_lock_depth",
791 .data = &max_lock_depth,
792 .maxlen = sizeof(int),
793 .mode = 0644,
794 .proc_handler = &proc_dointvec,
795 },
796#endif
5096add8
KC		 797#ifdef CONFIG_PROC_FS
798 {
799 .ctl_name = CTL_UNNUMBERED,
800 .procname = "maps_protect",
801 .data = &maps_protect,
802 .maxlen = sizeof(int),
803 .mode = 0644,
804 .proc_handler = &proc_dointvec,
805 },
806#endif
10a0a8d4
JF		 807 {
808 .ctl_name = CTL_UNNUMBERED,
809 .procname = "poweroff_cmd",
810 .data = &poweroff_cmd,
811 .maxlen = POWEROFF_CMD_PATH_LEN,
812 .mode = 0644,
813 .proc_handler = &proc_dostring,
814 .strategy = &sysctl_string,
815 },
0b77f5bf
DH		 816#ifdef CONFIG_KEYS
817 {
818 .ctl_name = CTL_UNNUMBERED,
819 .procname = "keys",
820 .mode = 0555,
821 .child = key_sysctls,
822 },
823#endif
ed2c12f3
AM		 824/*
825 * NOTE: do not add new entries to this table unless you have read
826 * Documentation/sysctl/ctl_unnumbered.txt
827 */
1da177e4
LT		 828 { .ctl_name = 0 }
829};
830
d8217f07 831static struct ctl_table vm_table[] = {
1da177e4
LT		 832 {
833 .ctl_name = VM_OVERCOMMIT_MEMORY,
834 .procname = "overcommit_memory",
835 .data = &sysctl_overcommit_memory,
836 .maxlen = sizeof(sysctl_overcommit_memory),
837 .mode = 0644,
838 .proc_handler = &proc_dointvec,
839 },
fadd8fbd
KH		 840 {
841 .ctl_name = VM_PANIC_ON_OOM,
842 .procname = "panic_on_oom",
843 .data = &sysctl_panic_on_oom,
844 .maxlen = sizeof(sysctl_panic_on_oom),
845 .mode = 0644,
846 .proc_handler = &proc_dointvec,
847 },
fe071d7e
DR		 848 {
849 .ctl_name = CTL_UNNUMBERED,
850 .procname = "oom_kill_allocating_task",
851 .data = &sysctl_oom_kill_allocating_task,
852 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
853 .mode = 0644,
854 .proc_handler = &proc_dointvec,
855 },
fef1bdd6
DR		 856 {
857 .ctl_name = CTL_UNNUMBERED,
858 .procname = "oom_dump_tasks",
859 .data = &sysctl_oom_dump_tasks,
860 .maxlen = sizeof(sysctl_oom_dump_tasks),
861 .mode = 0644,
862 .proc_handler = &proc_dointvec,
863 },
1da177e4
LT		 864 {
865 .ctl_name = VM_OVERCOMMIT_RATIO,
866 .procname = "overcommit_ratio",
867 .data = &sysctl_overcommit_ratio,
868 .maxlen = sizeof(sysctl_overcommit_ratio),
869 .mode = 0644,
870 .proc_handler = &proc_dointvec,
871 },
872 {
873 .ctl_name = VM_PAGE_CLUSTER,
874 .procname = "page-cluster",
875 .data = &page_cluster,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = &proc_dointvec,
879 },
880 {
881 .ctl_name = VM_DIRTY_BACKGROUND,
882 .procname = "dirty_background_ratio",
883 .data = &dirty_background_ratio,
884 .maxlen = sizeof(dirty_background_ratio),
885 .mode = 0644,
886 .proc_handler = &proc_dointvec_minmax,
887 .strategy = &sysctl_intvec,
888 .extra1 = &zero,
889 .extra2 = &one_hundred,
890 },
891 {
892 .ctl_name = VM_DIRTY_RATIO,
893 .procname = "dirty_ratio",
894 .data = &vm_dirty_ratio,
895 .maxlen = sizeof(vm_dirty_ratio),
896 .mode = 0644,
04fbfdc1 897 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 898 .strategy = &sysctl_intvec,
899 .extra1 = &zero,
900 .extra2 = &one_hundred,
901 },
902 {
1da177e4 903 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 904 .data = &dirty_writeback_interval,
905 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 906 .mode = 0644,
907 .proc_handler = &dirty_writeback_centisecs_handler,
908 },
909 {
1da177e4 910 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 911 .data = &dirty_expire_interval,
912 .maxlen = sizeof(dirty_expire_interval),
1da177e4 913 .mode = 0644,
f6ef9438 914 .proc_handler = &proc_dointvec_userhz_jiffies,
1da177e4
LT		 915 },
916 {
917 .ctl_name = VM_NR_PDFLUSH_THREADS,
918 .procname = "nr_pdflush_threads",
919 .data = &nr_pdflush_threads,
920 .maxlen = sizeof nr_pdflush_threads,
921 .mode = 0444 /* read-only*/,
922 .proc_handler = &proc_dointvec,
923 },
924 {
925 .ctl_name = VM_SWAPPINESS,
926 .procname = "swappiness",
927 .data = &vm_swappiness,
928 .maxlen = sizeof(vm_swappiness),
929 .mode = 0644,
930 .proc_handler = &proc_dointvec_minmax,
931 .strategy = &sysctl_intvec,
932 .extra1 = &zero,
933 .extra2 = &one_hundred,
934 },
935#ifdef CONFIG_HUGETLB_PAGE
936 {
1da177e4
LT		 937 .procname = "nr_hugepages",
938 .data = &max_huge_pages,
939 .maxlen = sizeof(unsigned long),
940 .mode = 0644,
941 .proc_handler = &hugetlb_sysctl_handler,
942 .extra1 = (void *)&hugetlb_zero,
943 .extra2 = (void *)&hugetlb_infinity,
944 },
945 {
946 .ctl_name = VM_HUGETLB_GROUP,
947 .procname = "hugetlb_shm_group",
948 .data = &sysctl_hugetlb_shm_group,
949 .maxlen = sizeof(gid_t),
950 .mode = 0644,
951 .proc_handler = &proc_dointvec,
952 },
396faf03
MG		 953 {
954 .ctl_name = CTL_UNNUMBERED,
955 .procname = "hugepages_treat_as_movable",
956 .data = &hugepages_treat_as_movable,
957 .maxlen = sizeof(int),
958 .mode = 0644,
959 .proc_handler = &hugetlb_treat_movable_handler,
960 },
d1c3fb1f
NA		 961 {
962 .ctl_name = CTL_UNNUMBERED,
963 .procname = "nr_overcommit_hugepages",
064d9efe
NA		 964 .data = &sysctl_overcommit_huge_pages,
965 .maxlen = sizeof(sysctl_overcommit_huge_pages),
d1c3fb1f 966 .mode = 0644,
a3d0c6aa 967 .proc_handler = &hugetlb_overcommit_handler,
d1c3fb1f 968 },
1da177e4
LT		 969#endif
970 {
971 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
972 .procname = "lowmem_reserve_ratio",
973 .data = &sysctl_lowmem_reserve_ratio,
974 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
975 .mode = 0644,
976 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
977 .strategy = &sysctl_intvec,
978 },
9d0243bc
AM		 979 {
980 .ctl_name = VM_DROP_PAGECACHE,
981 .procname = "drop_caches",
982 .data = &sysctl_drop_caches,
983 .maxlen = sizeof(int),
984 .mode = 0644,
985 .proc_handler = drop_caches_sysctl_handler,
986 .strategy = &sysctl_intvec,
987 },
1da177e4
LT		 988 {
989 .ctl_name = VM_MIN_FREE_KBYTES,
990 .procname = "min_free_kbytes",
991 .data = &min_free_kbytes,
992 .maxlen = sizeof(min_free_kbytes),
993 .mode = 0644,
994 .proc_handler = &min_free_kbytes_sysctl_handler,
995 .strategy = &sysctl_intvec,
996 .extra1 = &zero,
997 },
8ad4b1fb
RS		 998 {
999 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1000 .procname = "percpu_pagelist_fraction",
1001 .data = &percpu_pagelist_fraction,
1002 .maxlen = sizeof(percpu_pagelist_fraction),
1003 .mode = 0644,
1004 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1005 .strategy = &sysctl_intvec,
1006 .extra1 = &min_percpu_pagelist_fract,
1007 },
1da177e4
LT		 1008#ifdef CONFIG_MMU
1009 {
1010 .ctl_name = VM_MAX_MAP_COUNT,
1011 .procname = "max_map_count",
1012 .data = &sysctl_max_map_count,
1013 .maxlen = sizeof(sysctl_max_map_count),
1014 .mode = 0644,
1015 .proc_handler = &proc_dointvec
1016 },
1017#endif
1018 {
1019 .ctl_name = VM_LAPTOP_MODE,
1020 .procname = "laptop_mode",
1021 .data = &laptop_mode,
1022 .maxlen = sizeof(laptop_mode),
1023 .mode = 0644,
ed5b43f1
BS		 1024 .proc_handler = &proc_dointvec_jiffies,
1025 .strategy = &sysctl_jiffies,
1da177e4
LT		 1026 },
1027 {
1028 .ctl_name = VM_BLOCK_DUMP,
1029 .procname = "block_dump",
1030 .data = &block_dump,
1031 .maxlen = sizeof(block_dump),
1032 .mode = 0644,
1033 .proc_handler = &proc_dointvec,
1034 .strategy = &sysctl_intvec,
1035 .extra1 = &zero,
1036 },
1037 {
1038 .ctl_name = VM_VFS_CACHE_PRESSURE,
1039 .procname = "vfs_cache_pressure",
1040 .data = &sysctl_vfs_cache_pressure,
1041 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1042 .mode = 0644,
1043 .proc_handler = &proc_dointvec,
1044 .strategy = &sysctl_intvec,
1045 .extra1 = &zero,
1046 },
1047#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1048 {
1049 .ctl_name = VM_LEGACY_VA_LAYOUT,
1050 .procname = "legacy_va_layout",
1051 .data = &sysctl_legacy_va_layout,
1052 .maxlen = sizeof(sysctl_legacy_va_layout),
1053 .mode = 0644,
1054 .proc_handler = &proc_dointvec,
1055 .strategy = &sysctl_intvec,
1056 .extra1 = &zero,
1057 },
1058#endif
1743660b
CL		 1059#ifdef CONFIG_NUMA
1060 {
1061 .ctl_name = VM_ZONE_RECLAIM_MODE,
1062 .procname = "zone_reclaim_mode",
1063 .data = &zone_reclaim_mode,
1064 .maxlen = sizeof(zone_reclaim_mode),
1065 .mode = 0644,
1066 .proc_handler = &proc_dointvec,
c84db23c
CL		 1067 .strategy = &sysctl_intvec,
1068 .extra1 = &zero,
1743660b 1069 },
9614634f
CL		 1070 {
1071 .ctl_name = VM_MIN_UNMAPPED,
1072 .procname = "min_unmapped_ratio",
1073 .data = &sysctl_min_unmapped_ratio,
1074 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1075 .mode = 0644,
1076 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1077 .strategy = &sysctl_intvec,
1078 .extra1 = &zero,
1079 .extra2 = &one_hundred,
1080 },
0ff38490
CL		 1081 {
1082 .ctl_name = VM_MIN_SLAB,
1083 .procname = "min_slab_ratio",
1084 .data = &sysctl_min_slab_ratio,
1085 .maxlen = sizeof(sysctl_min_slab_ratio),
1086 .mode = 0644,
1087 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1088 .strategy = &sysctl_intvec,
1089 .extra1 = &zero,
1090 .extra2 = &one_hundred,
1091 },
e6e5494c 1092#endif
77461ab3
CL		 1093#ifdef CONFIG_SMP
1094 {
1095 .ctl_name = CTL_UNNUMBERED,
1096 .procname = "stat_interval",
1097 .data = &sysctl_stat_interval,
1098 .maxlen = sizeof(sysctl_stat_interval),
1099 .mode = 0644,
1100 .proc_handler = &proc_dointvec_jiffies,
1101 .strategy = &sysctl_jiffies,
1102 },
1103#endif
ed032189
EP		 1104#ifdef CONFIG_SECURITY
1105 {
1106 .ctl_name = CTL_UNNUMBERED,
1107 .procname = "mmap_min_addr",
1108 .data = &mmap_min_addr,
1109 .maxlen = sizeof(unsigned long),
1110 .mode = 0644,
1111 .proc_handler = &proc_doulongvec_minmax,
1112 },
8daec965 1113#endif
f0c0b2b8
KH		 1114#ifdef CONFIG_NUMA
1115 {
1116 .ctl_name = CTL_UNNUMBERED,
1117 .procname = "numa_zonelist_order",
1118 .data = &numa_zonelist_order,
1119 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1120 .mode = 0644,
1121 .proc_handler = &numa_zonelist_order_handler,
1122 .strategy = &sysctl_string,
1123 },
1124#endif
2b8232ce 1125#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1126 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1127 {
1128 .ctl_name = VM_VDSO_ENABLED,
1129 .procname = "vdso_enabled",
1130 .data = &vdso_enabled,
1131 .maxlen = sizeof(vdso_enabled),
1132 .mode = 0644,
1133 .proc_handler = &proc_dointvec,
1134 .strategy = &sysctl_intvec,
1135 .extra1 = &zero,
1136 },
1da177e4 1137#endif
195cf453
BG		 1138#ifdef CONFIG_HIGHMEM
1139 {
1140 .ctl_name = CTL_UNNUMBERED,
1141 .procname = "highmem_is_dirtyable",
1142 .data = &vm_highmem_is_dirtyable,
1143 .maxlen = sizeof(vm_highmem_is_dirtyable),
1144 .mode = 0644,
1145 .proc_handler = &proc_dointvec_minmax,
1146 .strategy = &sysctl_intvec,
1147 .extra1 = &zero,
1148 .extra2 = &one,
1149 },
1150#endif
2be7fe07
AM		 1151/*
1152 * NOTE: do not add new entries to this table unless you have read
1153 * Documentation/sysctl/ctl_unnumbered.txt
1154 */
1da177e4
LT		 1155 { .ctl_name = 0 }
1156};
1157
2abc26fc 1158#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1159static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1160 { .ctl_name = 0 }
1161};
1162#endif
1163
d8217f07 1164static struct ctl_table fs_table[] = {
1da177e4
LT		 1165 {
1166 .ctl_name = FS_NRINODE,
1167 .procname = "inode-nr",
1168 .data = &inodes_stat,
1169 .maxlen = 2*sizeof(int),
1170 .mode = 0444,
1171 .proc_handler = &proc_dointvec,
1172 },
1173 {
1174 .ctl_name = FS_STATINODE,
1175 .procname = "inode-state",
1176 .data = &inodes_stat,
1177 .maxlen = 7*sizeof(int),
1178 .mode = 0444,
1179 .proc_handler = &proc_dointvec,
1180 },
1181 {
1da177e4
LT		 1182 .procname = "file-nr",
1183 .data = &files_stat,
1184 .maxlen = 3*sizeof(int),
1185 .mode = 0444,
529bf6be 1186 .proc_handler = &proc_nr_files,
1da177e4
LT		 1187 },
1188 {
1189 .ctl_name = FS_MAXFILE,
1190 .procname = "file-max",
1191 .data = &files_stat.max_files,
1192 .maxlen = sizeof(int),
1193 .mode = 0644,
1194 .proc_handler = &proc_dointvec,
1195 },
9cfe015a
ED		 1196 {
1197 .ctl_name = CTL_UNNUMBERED,
1198 .procname = "nr_open",
1199 .data = &sysctl_nr_open,
1200 .maxlen = sizeof(int),
1201 .mode = 0644,
eceea0b3
AV		 1202 .proc_handler = &proc_dointvec_minmax,
1203 .extra1 = &sysctl_nr_open_min,
1204 .extra2 = &sysctl_nr_open_max,
9cfe015a 1205 },
1da177e4
LT		 1206 {
1207 .ctl_name = FS_DENTRY,
1208 .procname = "dentry-state",
1209 .data = &dentry_stat,
1210 .maxlen = 6*sizeof(int),
1211 .mode = 0444,
1212 .proc_handler = &proc_dointvec,
1213 },
1214 {
1215 .ctl_name = FS_OVERFLOWUID,
1216 .procname = "overflowuid",
1217 .data = &fs_overflowuid,
1218 .maxlen = sizeof(int),
1219 .mode = 0644,
1220 .proc_handler = &proc_dointvec_minmax,
1221 .strategy = &sysctl_intvec,
1222 .extra1 = &minolduid,
1223 .extra2 = &maxolduid,
1224 },
1225 {
1226 .ctl_name = FS_OVERFLOWGID,
1227 .procname = "overflowgid",
1228 .data = &fs_overflowgid,
1229 .maxlen = sizeof(int),
1230 .mode = 0644,
1231 .proc_handler = &proc_dointvec_minmax,
1232 .strategy = &sysctl_intvec,
1233 .extra1 = &minolduid,
1234 .extra2 = &maxolduid,
1235 },
1236 {
1237 .ctl_name = FS_LEASES,
1238 .procname = "leases-enable",
1239 .data = &leases_enable,
1240 .maxlen = sizeof(int),
1241 .mode = 0644,
1242 .proc_handler = &proc_dointvec,
1243 },
1244#ifdef CONFIG_DNOTIFY
1245 {
1246 .ctl_name = FS_DIR_NOTIFY,
1247 .procname = "dir-notify-enable",
1248 .data = &dir_notify_enable,
1249 .maxlen = sizeof(int),
1250 .mode = 0644,
1251 .proc_handler = &proc_dointvec,
1252 },
1253#endif
1254#ifdef CONFIG_MMU
1255 {
1256 .ctl_name = FS_LEASE_TIME,
1257 .procname = "lease-break-time",
1258 .data = &lease_break_time,
1259 .maxlen = sizeof(int),
1260 .mode = 0644,
76fdbb25
KH		 1261 .proc_handler = &proc_dointvec_minmax,
1262 .strategy = &sysctl_intvec,
1263 .extra1 = &zero,
1264 .extra2 = &two,
1da177e4
LT		 1265 },
1266 {
1da177e4
LT		 1267 .procname = "aio-nr",
1268 .data = &aio_nr,
1269 .maxlen = sizeof(aio_nr),
1270 .mode = 0444,
d55b5fda 1271 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1272 },
1273 {
1da177e4
LT		 1274 .procname = "aio-max-nr",
1275 .data = &aio_max_nr,
1276 .maxlen = sizeof(aio_max_nr),
1277 .mode = 0644,
d55b5fda 1278 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1279 },
2d9048e2 1280#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1281 {
1282 .ctl_name = FS_INOTIFY,
1283 .procname = "inotify",
1284 .mode = 0555,
1285 .child = inotify_table,
1286 },
1287#endif
1da177e4 1288#endif
d6e71144
AC		 1289 {
1290 .ctl_name = KERN_SETUID_DUMPABLE,
1291 .procname = "suid_dumpable",
1292 .data = &suid_dumpable,
1293 .maxlen = sizeof(int),
1294 .mode = 0644,
1295 .proc_handler = &proc_dointvec,
1296 },
2abc26fc
EB		 1297#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1298 {
1299 .ctl_name = CTL_UNNUMBERED,
1300 .procname = "binfmt_misc",
1301 .mode = 0555,
1302 .child = binfmt_misc_table,
1303 },
1304#endif
2be7fe07
AM		 1305/*
1306 * NOTE: do not add new entries to this table unless you have read
1307 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1308 */
1da177e4
LT		 1309 { .ctl_name = 0 }
1310};
1311
d8217f07 1312static struct ctl_table debug_table[] = {
d0c3d534 1313#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1314 {
1315 .ctl_name = CTL_UNNUMBERED,
1316 .procname = "exception-trace",
1317 .data = &show_unhandled_signals,
1318 .maxlen = sizeof(int),
1319 .mode = 0644,
1320 .proc_handler = proc_dointvec
1321 },
1322#endif
1da177e4
LT		 1323 { .ctl_name = 0 }
1324};
1325
d8217f07 1326static struct ctl_table dev_table[] = {
1da177e4 1327 { .ctl_name = 0 }
0eeca283 1328};
1da177e4 1329
330d57fb
AV		 1330static DEFINE_SPINLOCK(sysctl_lock);
1331
1332/* called under sysctl_lock */
1333static int use_table(struct ctl_table_header *p)
1334{
1335 if (unlikely(p->unregistering))
1336 return 0;
1337 p->used++;
1338 return 1;
1339}
1340
1341/* called under sysctl_lock */
1342static void unuse_table(struct ctl_table_header *p)
1343{
1344 if (!--p->used)
1345 if (unlikely(p->unregistering))
1346 complete(p->unregistering);
1347}
1348
1349/* called under sysctl_lock, will reacquire if has to wait */
1350static void start_unregistering(struct ctl_table_header *p)
1351{
1352 /*
1353 * if p->used is 0, nobody will ever touch that entry again;
1354 * we'll eliminate all paths to it before dropping sysctl_lock
1355 */
1356 if (unlikely(p->used)) {
1357 struct completion wait;
1358 init_completion(&wait);
1359 p->unregistering = &wait;
1360 spin_unlock(&sysctl_lock);
1361 wait_for_completion(&wait);
1362 spin_lock(&sysctl_lock);
1363 }
1364 /*
1365 * do not remove from the list until nobody holds it; walking the
1366 * list in do_sysctl() relies on that.
1367 */
1368 list_del_init(&p->ctl_entry);
1369}
1370
805b5d5e
EB		 1371void sysctl_head_finish(struct ctl_table_header *head)
1372{
1373 if (!head)
1374 return;
1375 spin_lock(&sysctl_lock);
1376 unuse_table(head);
1377 spin_unlock(&sysctl_lock);
1378}
1379
e51b6ba0
EB		 1380static struct list_head *
1381lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1382{
e51b6ba0
EB		 1383 struct list_head *header_list;
1384 header_list = &root->header_list;
1385 if (root->lookup)
1386 header_list = root->lookup(root, namespaces);
1387 return header_list;
1388}
1389
1390struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1391 struct ctl_table_header *prev)
1392{
1393 struct ctl_table_root *root;
1394 struct list_head *header_list;
805b5d5e
EB		 1395 struct ctl_table_header *head;
1396 struct list_head *tmp;
e51b6ba0 1397
805b5d5e
EB		 1398 spin_lock(&sysctl_lock);
1399 if (prev) {
e51b6ba0 1400 head = prev;
805b5d5e
EB		 1401 tmp = &prev->ctl_entry;
1402 unuse_table(prev);
1403 goto next;
1404 }
1405 tmp = &root_table_header.ctl_entry;
1406 for (;;) {
1407 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1408
1409 if (!use_table(head))
1410 goto next;
1411 spin_unlock(&sysctl_lock);
1412 return head;
1413 next:
e51b6ba0 1414 root = head->root;
805b5d5e 1415 tmp = tmp->next;
e51b6ba0
EB		 1416 header_list = lookup_header_list(root, namespaces);
1417 if (tmp != header_list)
1418 continue;
1419
1420 do {
1421 root = list_entry(root->root_list.next,
1422 struct ctl_table_root, root_list);
1423 if (root == &sysctl_table_root)
1424 goto out;
1425 header_list = lookup_header_list(root, namespaces);
1426 } while (list_empty(header_list));
1427 tmp = header_list->next;
805b5d5e 1428 }
e51b6ba0 1429out:
805b5d5e
EB		 1430 spin_unlock(&sysctl_lock);
1431 return NULL;
1432}
1433
e51b6ba0
EB		 1434struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1435{
1436 return __sysctl_head_next(current->nsproxy, prev);
1437}
1438
1439void register_sysctl_root(struct ctl_table_root *root)
1440{
1441 spin_lock(&sysctl_lock);
1442 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1443 spin_unlock(&sysctl_lock);
1444}
1445
b89a8171 1446#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1447/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1448static int do_sysctl_strategy(struct ctl_table_root *root,
1449 struct ctl_table *table,
2c4c7155
PE		 1450 int __user *name, int nlen,
1451 void __user *oldval, size_t __user *oldlenp,
1452 void __user *newval, size_t newlen)
1453{
1454 int op = 0, rc;
1455
1456 if (oldval)
1457 op |= 004;
1458 if (newval)
1459 op |= 002;
d7321cd6 1460 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1461 return -EPERM;
1462
1463 if (table->strategy) {
1464 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1465 newval, newlen);
1466 if (rc < 0)
1467 return rc;
1468 if (rc > 0)
1469 return 0;
1470 }
1471
1472 /* If there is no strategy routine, or if the strategy returns
1473 * zero, proceed with automatic r/w */
1474 if (table->data && table->maxlen) {
1475 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1476 newval, newlen);
1477 if (rc < 0)
1478 return rc;
1479 }
1480 return 0;
1481}
1482
1483static int parse_table(int __user *name, int nlen,
1484 void __user *oldval, size_t __user *oldlenp,
1485 void __user *newval, size_t newlen,
d7321cd6 1486 struct ctl_table_root *root,
2c4c7155
PE		 1487 struct ctl_table *table)
1488{
1489 int n;
1490repeat:
1491 if (!nlen)
1492 return -ENOTDIR;
1493 if (get_user(n, name))
1494 return -EFAULT;
1495 for ( ; table->ctl_name || table->procname; table++) {
1496 if (!table->ctl_name)
1497 continue;
1498 if (n == table->ctl_name) {
1499 int error;
1500 if (table->child) {
d7321cd6 1501 if (sysctl_perm(root, table, 001))
2c4c7155
PE		 1502 return -EPERM;
1503 name++;
1504 nlen--;
1505 table = table->child;
1506 goto repeat;
1507 }
d7321cd6 1508 error = do_sysctl_strategy(root, table, name, nlen,
2c4c7155
PE		 1509 oldval, oldlenp,
1510 newval, newlen);
1511 return error;
1512 }
1513 }
1514 return -ENOTDIR;
1515}
1516
1da177e4
LT		 1517int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1518 void __user *newval, size_t newlen)
1519{
805b5d5e 1520 struct ctl_table_header *head;
330d57fb 1521 int error = -ENOTDIR;
1da177e4
LT		 1522
1523 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1524 return -ENOTDIR;
1525 if (oldval) {
1526 int old_len;
1527 if (!oldlenp || get_user(old_len, oldlenp))
1528 return -EFAULT;
1529 }
330d57fb 1530
805b5d5e
EB		 1531 for (head = sysctl_head_next(NULL); head;
1532 head = sysctl_head_next(head)) {
330d57fb 1533 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1534 newval, newlen,
1535 head->root, head->ctl_table);
805b5d5e
EB		 1536 if (error != -ENOTDIR) {
1537 sysctl_head_finish(head);
330d57fb 1538 break;
805b5d5e
EB		 1539 }
1540 }
330d57fb 1541 return error;
1da177e4
LT		 1542}
1543
1544asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1545{
1546 struct __sysctl_args tmp;
1547 int error;
1548
1549 if (copy_from_user(&tmp, args, sizeof(tmp)))
1550 return -EFAULT;
1551
7058cb02
EB		 1552 error = deprecated_sysctl_warning(&tmp);
1553 if (error)
1554 goto out;
1555
1da177e4
LT		 1556 lock_kernel();
1557 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1558 tmp.newval, tmp.newlen);
1559 unlock_kernel();
7058cb02 1560out:
1da177e4
LT		 1561 return error;
1562}
b89a8171 1563#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1564
1565/*
1ff007eb 1566 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1567 * some sysctl variables are readonly even to root.
1568 */
1569
1570static int test_perm(int mode, int op)
1571{
1572 if (!current->euid)
1573 mode >>= 6;
1574 else if (in_egroup_p(0))
1575 mode >>= 3;
1576 if ((mode & op & 0007) == op)
1577 return 0;
1578 return -EACCES;
1579}
1580
d7321cd6 1581int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1582{
1583 int error;
d7321cd6
PE		 1584 int mode;
1585
1da177e4
LT		 1586 error = security_sysctl(table, op);
1587 if (error)
1588 return error;
d7321cd6
PE		 1589
1590 if (root->permissions)
1591 mode = root->permissions(root, current->nsproxy, table);
1592 else
1593 mode = table->mode;
1594
1595 return test_perm(mode, op);
1da177e4
LT		 1596}
1597
d912b0cc
EB		 1598static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1599{
1600 for (; table->ctl_name || table->procname; table++) {
1601 table->parent = parent;
1602 if (table->child)
1603 sysctl_set_parent(table, table->child);
1604 }
1605}
1606
1607static __init int sysctl_init(void)
1608{
1609 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1610#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1611 {
1612 int err;
1613 err = sysctl_check_table(current->nsproxy, root_table);
1614 }
1615#endif
d912b0cc
EB		 1616 return 0;
1617}
1618
1619core_initcall(sysctl_init);
1620
1da177e4 1621/**
e51b6ba0
EB		 1622 * __register_sysctl_paths - register a sysctl hierarchy
1623 * @root: List of sysctl headers to register on
1624 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1625 * @path: The path to the directory the sysctl table is in.
1da177e4 1626 * @table: the top-level table structure
1da177e4
LT		 1627 *
1628 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1629 * array. A completely 0 filled entry terminates the table.
1da177e4 1630 *
d8217f07 1631 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1632 *
1633 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1634 * must be unique within that level of sysctl
1635 *
1636 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1637 * enter a sysctl file
1638 *
1639 * data - a pointer to data for use by proc_handler
1640 *
1641 * maxlen - the maximum size in bytes of the data
1642 *
1643 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1644 *
1645 * child - a pointer to the child sysctl table if this entry is a directory, or
1646 * %NULL.
1647 *
1648 * proc_handler - the text handler routine (described below)
1649 *
1650 * strategy - the strategy routine (described below)
1651 *
1652 * de - for internal use by the sysctl routines
1653 *
1654 * extra1, extra2 - extra pointers usable by the proc handler routines
1655 *
1656 * Leaf nodes in the sysctl tree will be represented by a single file
1657 * under /proc; non-leaf nodes will be represented by directories.
1658 *
1659 * sysctl(2) can automatically manage read and write requests through
1660 * the sysctl table. The data and maxlen fields of the ctl_table
1661 * struct enable minimal validation of the values being written to be
1662 * performed, and the mode field allows minimal authentication.
1663 *
1664 * More sophisticated management can be enabled by the provision of a
1665 * strategy routine with the table entry. This will be called before
1666 * any automatic read or write of the data is performed.
1667 *
1668 * The strategy routine may return
1669 *
1670 * < 0 - Error occurred (error is passed to user process)
1671 *
1672 * 0 - OK - proceed with automatic read or write.
1673 *
1674 * > 0 - OK - read or write has been done by the strategy routine, so
1675 * return immediately.
1676 *
1677 * There must be a proc_handler routine for any terminal nodes
1678 * mirrored under /proc/sys (non-terminals are handled by a built-in
1679 * directory handler). Several default handlers are available to
1680 * cover common cases -
1681 *
1682 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1683 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1684 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1685 *
1686 * It is the handler's job to read the input buffer from user memory
1687 * and process it. The handler should return 0 on success.
1688 *
1689 * This routine returns %NULL on a failure to register, and a pointer
1690 * to the table header on success.
1691 */
e51b6ba0
EB		 1692struct ctl_table_header *__register_sysctl_paths(
1693 struct ctl_table_root *root,
1694 struct nsproxy *namespaces,
1695 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1696{
e51b6ba0 1697 struct list_head *header_list;
29e796fd
EB		 1698 struct ctl_table_header *header;
1699 struct ctl_table *new, **prevp;
1700 unsigned int n, npath;
1701
1702 /* Count the path components */
1703 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1704 ;
1705
1706 /*
1707 * For each path component, allocate a 2-element ctl_table array.
1708 * The first array element will be filled with the sysctl entry
1709 * for this, the second will be the sentinel (ctl_name == 0).
1710 *
1711 * We allocate everything in one go so that we don't have to
1712 * worry about freeing additional memory in unregister_sysctl_table.
1713 */
1714 header = kzalloc(sizeof(struct ctl_table_header) +
1715 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1716 if (!header)
1da177e4 1717 return NULL;
29e796fd
EB		 1718
1719 new = (struct ctl_table *) (header + 1);
1720
1721 /* Now connect the dots */
1722 prevp = &header->ctl_table;
1723 for (n = 0; n < npath; ++n, ++path) {
1724 /* Copy the procname */
1725 new->procname = path->procname;
1726 new->ctl_name = path->ctl_name;
1727 new->mode = 0555;
1728
1729 *prevp = new;
1730 prevp = &new->child;
1731
1732 new += 2;
1733 }
1734 *prevp = table;
23eb06de 1735 header->ctl_table_arg = table;
29e796fd
EB		 1736
1737 INIT_LIST_HEAD(&header->ctl_entry);
1738 header->used = 0;
1739 header->unregistering = NULL;
e51b6ba0 1740 header->root = root;
29e796fd 1741 sysctl_set_parent(NULL, header->ctl_table);
88f458e4 1742#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1743 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1744 kfree(header);
fc6cd25b
EB		 1745 return NULL;
1746 }
88f458e4 1747#endif
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);
Linux kernel - Deliverables
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