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Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[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>
c748e134 46#include <linux/vmstat.h>
c255d844
PM		 47#include <linux/nfs_fs.h>
48#include <linux/acpi.h>
10a0a8d4 49#include <linux/reboot.h>
b0fc494f 50#include <linux/ftrace.h>
12e22c5e 51#include <linux/slow-work.h>
1da177e4
LT		 52
53#include <asm/uaccess.h>
54#include <asm/processor.h>
55
29cbc78b
AK		 56#ifdef CONFIG_X86
57#include <asm/nmi.h>
0741f4d2 58#include <asm/stacktrace.h>
6e7c4025 59#include <asm/io.h>
29cbc78b
AK		 60#endif
61
7058cb02
EB		 62static int deprecated_sysctl_warning(struct __sysctl_args *args);
63
1da177e4
LT		 64#if defined(CONFIG_SYSCTL)
65
66/* External variables not in a header file. */
67extern int C_A_D;
45807a1d 68extern int print_fatal_signals;
1da177e4
LT		 69extern int sysctl_overcommit_memory;
70extern int sysctl_overcommit_ratio;
fadd8fbd 71extern int sysctl_panic_on_oom;
fe071d7e 72extern int sysctl_oom_kill_allocating_task;
fef1bdd6 73extern int sysctl_oom_dump_tasks;
1da177e4 74extern int max_threads;
1da177e4 75extern int core_uses_pid;
d6e71144 76extern int suid_dumpable;
1da177e4 77extern char core_pattern[];
1da177e4
LT		 78extern int pid_max;
79extern int min_free_kbytes;
1da177e4 80extern int pid_max_min, pid_max_max;
9d0243bc 81extern int sysctl_drop_caches;
8ad4b1fb 82extern int percpu_pagelist_fraction;
bebfa101 83extern int compat_log;
9745512c 84extern int latencytop_enabled;
eceea0b3 85extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 86#ifndef CONFIG_MMU
87extern int sysctl_nr_trim_pages;
88#endif
31a72bce
PM		 89#ifdef CONFIG_RCU_TORTURE_TEST
90extern int rcutorture_runnable;
91#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 92
c4f3b63f 93/* Constants used for minimum and maximum */
195cf453 94#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 95static int sixty = 60;
9383d967 96static int neg_one = -1;
c4f3b63f
RT		 97#endif
98
c4f3b63f 99static int zero;
cd5f9a4c
LT		 100static int __maybe_unused one = 1;
101static int __maybe_unused two = 2;
fc3501d4 102static unsigned long one_ul = 1;
c4f3b63f 103static int one_hundred = 100;
fafd688e 104static int one_thousand = 1000;
c4f3b63f 105
9e4a5bda
AR		 106/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
107static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
108
1da177e4
LT		 109/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
110static int maxolduid = 65535;
111static int minolduid;
8ad4b1fb 112static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 113
114static int ngroups_max = NGROUPS_MAX;
115
a1ef5adb 116#ifdef CONFIG_MODULES
1da177e4
LT		 117extern char modprobe_path[];
118#endif
1da177e4
LT		 119#ifdef CONFIG_CHR_DEV_SG
120extern int sg_big_buff;
121#endif
1da177e4 122
72c57ed5 123#ifdef CONFIG_SPARC
17f04fbb 124#include <asm/system.h>
1da177e4
LT		 125#endif
126
0871420f
DM		 127#ifdef CONFIG_SPARC64
128extern int sysctl_tsb_ratio;
129#endif
130
1da177e4
LT		 131#ifdef __hppa__
132extern int pwrsw_enabled;
133extern int unaligned_enabled;
134#endif
135
347a8dc3 136#ifdef CONFIG_S390
1da177e4
LT		 137#ifdef CONFIG_MATHEMU
138extern int sysctl_ieee_emulation_warnings;
139#endif
140extern int sysctl_userprocess_debug;
951f22d5 141extern int spin_retry;
1da177e4
LT		 142#endif
143
1da177e4
LT		 144#ifdef CONFIG_BSD_PROCESS_ACCT
145extern int acct_parm[];
146#endif
147
d2b176ed
JS		 148#ifdef CONFIG_IA64
149extern int no_unaligned_warning;
88fc241f 150extern int unaligned_dump_stack;
d2b176ed
JS		 151#endif
152
23f78d4a
IM		 153#ifdef CONFIG_RT_MUTEXES
154extern int max_lock_depth;
155#endif
156
d6f8ff73 157#ifdef CONFIG_PROC_SYSCTL
d8217f07 158static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 159 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 160static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 161 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 162#endif
9ec52099 163
d8217f07 164static struct ctl_table root_table[];
e51b6ba0
EB		 165static struct ctl_table_root sysctl_table_root;
166static struct ctl_table_header root_table_header = {
b380b0d4 167 .count = 1,
e51b6ba0 168 .ctl_table = root_table,
73455092 169 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 170 .root = &sysctl_table_root,
73455092 171 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 172};
173static struct ctl_table_root sysctl_table_root = {
174 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 175 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 176};
1da177e4 177
d8217f07
EB		 178static struct ctl_table kern_table[];
179static struct ctl_table vm_table[];
180static struct ctl_table fs_table[];
181static struct ctl_table debug_table[];
182static struct ctl_table dev_table[];
183extern struct ctl_table random_table[];
2d9048e2 184#ifdef CONFIG_INOTIFY_USER
d8217f07 185extern struct ctl_table inotify_table[];
0399cb08 186#endif
7ef9964e
DL		 187#ifdef CONFIG_EPOLL
188extern struct ctl_table epoll_table[];
189#endif
1da177e4
LT		 190
191#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
192int sysctl_legacy_va_layout;
193#endif
194
f20786ff
PZ		 195extern int prove_locking;
196extern int lock_stat;
9bc9a6bd 197
1da177e4
LT		 198/* The default sysctl tables: */
199
d8217f07 200static struct ctl_table root_table[] = {
1da177e4
LT		 201 {
202 .ctl_name = CTL_KERN,
203 .procname = "kernel",
204 .mode = 0555,
205 .child = kern_table,
206 },
207 {
208 .ctl_name = CTL_VM,
209 .procname = "vm",
210 .mode = 0555,
211 .child = vm_table,
212 },
1da177e4
LT		 213 {
214 .ctl_name = CTL_FS,
215 .procname = "fs",
216 .mode = 0555,
217 .child = fs_table,
218 },
219 {
220 .ctl_name = CTL_DEBUG,
221 .procname = "debug",
222 .mode = 0555,
223 .child = debug_table,
224 },
225 {
226 .ctl_name = CTL_DEV,
227 .procname = "dev",
228 .mode = 0555,
229 .child = dev_table,
230 },
2be7fe07
AM		 231/*
232 * NOTE: do not add new entries to this table unless you have read
233 * Documentation/sysctl/ctl_unnumbered.txt
234 */
1da177e4
LT		 235 { .ctl_name = 0 }
236};
237
77e54a1f 238#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 239static int min_sched_granularity_ns = 100000; /* 100 usecs */
240static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
241static int min_wakeup_granularity_ns; /* 0 usecs */
242static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 243#endif
244
d8217f07 245static struct ctl_table kern_table[] = {
77e54a1f
IM		 246#ifdef CONFIG_SCHED_DEBUG
247 {
248 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 249 .procname = "sched_min_granularity_ns",
250 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 251 .maxlen = sizeof(unsigned int),
252 .mode = 0644,
b2be5e96
PZ		 253 .proc_handler = &sched_nr_latency_handler,
254 .strategy = &sysctl_intvec,
255 .extra1 = &min_sched_granularity_ns,
256 .extra2 = &max_sched_granularity_ns,
77e54a1f 257 },
21805085
PZ		 258 {
259 .ctl_name = CTL_UNNUMBERED,
260 .procname = "sched_latency_ns",
261 .data = &sysctl_sched_latency,
262 .maxlen = sizeof(unsigned int),
263 .mode = 0644,
b2be5e96 264 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 265 .strategy = &sysctl_intvec,
266 .extra1 = &min_sched_granularity_ns,
267 .extra2 = &max_sched_granularity_ns,
268 },
77e54a1f
IM		 269 {
270 .ctl_name = CTL_UNNUMBERED,
271 .procname = "sched_wakeup_granularity_ns",
272 .data = &sysctl_sched_wakeup_granularity,
273 .maxlen = sizeof(unsigned int),
274 .mode = 0644,
275 .proc_handler = &proc_dointvec_minmax,
276 .strategy = &sysctl_intvec,
77e54a1f
IM		 277 .extra1 = &min_wakeup_granularity_ns,
278 .extra2 = &max_wakeup_granularity_ns,
279 },
2398f2c6
PZ		 280 {
281 .ctl_name = CTL_UNNUMBERED,
282 .procname = "sched_shares_ratelimit",
283 .data = &sysctl_sched_shares_ratelimit,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = &proc_dointvec,
287 },
ffda12a1
PZ		 288 {
289 .ctl_name = CTL_UNNUMBERED,
290 .procname = "sched_shares_thresh",
291 .data = &sysctl_sched_shares_thresh,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = &proc_dointvec_minmax,
295 .strategy = &sysctl_intvec,
296 .extra1 = &zero,
297 },
77e54a1f
IM		 298 {
299 .ctl_name = CTL_UNNUMBERED,
300 .procname = "sched_child_runs_first",
301 .data = &sysctl_sched_child_runs_first,
302 .maxlen = sizeof(unsigned int),
303 .mode = 0644,
304 .proc_handler = &proc_dointvec,
305 },
1fc84aaa
PZ		 306 {
307 .ctl_name = CTL_UNNUMBERED,
308 .procname = "sched_features",
309 .data = &sysctl_sched_features,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = &proc_dointvec,
313 },
da84d961
IM		 314 {
315 .ctl_name = CTL_UNNUMBERED,
316 .procname = "sched_migration_cost",
317 .data = &sysctl_sched_migration_cost,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = &proc_dointvec,
321 },
b82d9fdd
PZ		 322 {
323 .ctl_name = CTL_UNNUMBERED,
324 .procname = "sched_nr_migrate",
325 .data = &sysctl_sched_nr_migrate,
326 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 327 .mode = 0644,
328 .proc_handler = &proc_dointvec,
329 },
1fc84aaa 330#endif
9f0c1e56
PZ		 331 {
332 .ctl_name = CTL_UNNUMBERED,
333 .procname = "sched_rt_period_us",
334 .data = &sysctl_sched_rt_period,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
d0b27fa7 337 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 338 },
339 {
340 .ctl_name = CTL_UNNUMBERED,
341 .procname = "sched_rt_runtime_us",
342 .data = &sysctl_sched_rt_runtime,
343 .maxlen = sizeof(int),
344 .mode = 0644,
d0b27fa7 345 .proc_handler = &sched_rt_handler,
9f0c1e56 346 },
1799e35d
IM		 347 {
348 .ctl_name = CTL_UNNUMBERED,
349 .procname = "sched_compat_yield",
350 .data = &sysctl_sched_compat_yield,
351 .maxlen = sizeof(unsigned int),
352 .mode = 0644,
353 .proc_handler = &proc_dointvec,
354 },
f20786ff
PZ		 355#ifdef CONFIG_PROVE_LOCKING
356 {
357 .ctl_name = CTL_UNNUMBERED,
358 .procname = "prove_locking",
359 .data = &prove_locking,
360 .maxlen = sizeof(int),
361 .mode = 0644,
362 .proc_handler = &proc_dointvec,
363 },
364#endif
365#ifdef CONFIG_LOCK_STAT
366 {
367 .ctl_name = CTL_UNNUMBERED,
368 .procname = "lock_stat",
369 .data = &lock_stat,
370 .maxlen = sizeof(int),
371 .mode = 0644,
372 .proc_handler = &proc_dointvec,
373 },
77e54a1f 374#endif
1da177e4
LT		 375 {
376 .ctl_name = KERN_PANIC,
377 .procname = "panic",
378 .data = &panic_timeout,
379 .maxlen = sizeof(int),
380 .mode = 0644,
381 .proc_handler = &proc_dointvec,
382 },
383 {
384 .ctl_name = KERN_CORE_USES_PID,
385 .procname = "core_uses_pid",
386 .data = &core_uses_pid,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = &proc_dointvec,
390 },
391 {
392 .ctl_name = KERN_CORE_PATTERN,
393 .procname = "core_pattern",
394 .data = core_pattern,
71ce92f3 395 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 396 .mode = 0644,
397 .proc_handler = &proc_dostring,
398 .strategy = &sysctl_string,
399 },
34f5a398 400#ifdef CONFIG_PROC_SYSCTL
1da177e4 401 {
1da177e4 402 .procname = "tainted",
25ddbb18 403 .maxlen = sizeof(long),
34f5a398 404 .mode = 0644,
25ddbb18 405 .proc_handler = &proc_taint,
1da177e4 406 },
34f5a398 407#endif
9745512c
AV		 408#ifdef CONFIG_LATENCYTOP
409 {
410 .procname = "latencytop",
411 .data = &latencytop_enabled,
412 .maxlen = sizeof(int),
413 .mode = 0644,
414 .proc_handler = &proc_dointvec,
415 },
416#endif
1da177e4
LT		 417#ifdef CONFIG_BLK_DEV_INITRD
418 {
419 .ctl_name = KERN_REALROOTDEV,
420 .procname = "real-root-dev",
421 .data = &real_root_dev,
422 .maxlen = sizeof(int),
423 .mode = 0644,
424 .proc_handler = &proc_dointvec,
425 },
426#endif
45807a1d
IM		 427 {
428 .ctl_name = CTL_UNNUMBERED,
429 .procname = "print-fatal-signals",
430 .data = &print_fatal_signals,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = &proc_dointvec,
434 },
72c57ed5 435#ifdef CONFIG_SPARC
1da177e4
LT		 436 {
437 .ctl_name = KERN_SPARC_REBOOT,
438 .procname = "reboot-cmd",
439 .data = reboot_command,
440 .maxlen = 256,
441 .mode = 0644,
442 .proc_handler = &proc_dostring,
443 .strategy = &sysctl_string,
444 },
445 {
446 .ctl_name = KERN_SPARC_STOP_A,
447 .procname = "stop-a",
448 .data = &stop_a_enabled,
449 .maxlen = sizeof (int),
450 .mode = 0644,
451 .proc_handler = &proc_dointvec,
452 },
453 {
454 .ctl_name = KERN_SPARC_SCONS_PWROFF,
455 .procname = "scons-poweroff",
456 .data = &scons_pwroff,
457 .maxlen = sizeof (int),
458 .mode = 0644,
459 .proc_handler = &proc_dointvec,
460 },
461#endif
0871420f
DM		 462#ifdef CONFIG_SPARC64
463 {
464 .ctl_name = CTL_UNNUMBERED,
465 .procname = "tsb-ratio",
466 .data = &sysctl_tsb_ratio,
467 .maxlen = sizeof (int),
468 .mode = 0644,
469 .proc_handler = &proc_dointvec,
470 },
471#endif
1da177e4
LT		 472#ifdef __hppa__
473 {
474 .ctl_name = KERN_HPPA_PWRSW,
475 .procname = "soft-power",
476 .data = &pwrsw_enabled,
477 .maxlen = sizeof (int),
478 .mode = 0644,
479 .proc_handler = &proc_dointvec,
480 },
481 {
482 .ctl_name = KERN_HPPA_UNALIGNED,
483 .procname = "unaligned-trap",
484 .data = &unaligned_enabled,
485 .maxlen = sizeof (int),
486 .mode = 0644,
487 .proc_handler = &proc_dointvec,
488 },
489#endif
490 {
491 .ctl_name = KERN_CTLALTDEL,
492 .procname = "ctrl-alt-del",
493 .data = &C_A_D,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = &proc_dointvec,
497 },
606576ce 498#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 499 {
500 .ctl_name = CTL_UNNUMBERED,
501 .procname = "ftrace_enabled",
502 .data = &ftrace_enabled,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = &ftrace_enable_sysctl,
506 },
507#endif
f38f1d2a
SR		 508#ifdef CONFIG_STACK_TRACER
509 {
510 .ctl_name = CTL_UNNUMBERED,
511 .procname = "stack_tracer_enabled",
512 .data = &stack_tracer_enabled,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = &stack_trace_sysctl,
516 },
517#endif
944ac425
SR		 518#ifdef CONFIG_TRACING
519 {
520 .ctl_name = CTL_UNNUMBERED,
3299b4dd 521 .procname = "ftrace_dump_on_oops",
944ac425
SR		 522 .data = &ftrace_dump_on_oops,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = &proc_dointvec,
526 },
527#endif
a1ef5adb 528#ifdef CONFIG_MODULES
1da177e4
LT		 529 {
530 .ctl_name = KERN_MODPROBE,
531 .procname = "modprobe",
532 .data = &modprobe_path,
533 .maxlen = KMOD_PATH_LEN,
534 .mode = 0644,
535 .proc_handler = &proc_dostring,
536 .strategy = &sysctl_string,
537 },
538#endif
57ae2508 539#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 540 {
541 .ctl_name = KERN_HOTPLUG,
542 .procname = "hotplug",
312c004d
KS		 543 .data = &uevent_helper,
544 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 545 .mode = 0644,
546 .proc_handler = &proc_dostring,
547 .strategy = &sysctl_string,
548 },
549#endif
550#ifdef CONFIG_CHR_DEV_SG
551 {
552 .ctl_name = KERN_SG_BIG_BUFF,
553 .procname = "sg-big-buff",
554 .data = &sg_big_buff,
555 .maxlen = sizeof (int),
556 .mode = 0444,
557 .proc_handler = &proc_dointvec,
558 },
559#endif
560#ifdef CONFIG_BSD_PROCESS_ACCT
561 {
562 .ctl_name = KERN_ACCT,
563 .procname = "acct",
564 .data = &acct_parm,
565 .maxlen = 3*sizeof(int),
566 .mode = 0644,
567 .proc_handler = &proc_dointvec,
568 },
569#endif
1da177e4
LT		 570#ifdef CONFIG_MAGIC_SYSRQ
571 {
572 .ctl_name = KERN_SYSRQ,
573 .procname = "sysrq",
5d6f647f 574 .data = &__sysrq_enabled,
1da177e4
LT		 575 .maxlen = sizeof (int),
576 .mode = 0644,
577 .proc_handler = &proc_dointvec,
578 },
579#endif
d6f8ff73 580#ifdef CONFIG_PROC_SYSCTL
1da177e4 581 {
1da177e4 582 .procname = "cad_pid",
9ec52099 583 .data = NULL,
1da177e4
LT		 584 .maxlen = sizeof (int),
585 .mode = 0600,
9ec52099 586 .proc_handler = &proc_do_cad_pid,
1da177e4 587 },
d6f8ff73 588#endif
1da177e4
LT		 589 {
590 .ctl_name = KERN_MAX_THREADS,
591 .procname = "threads-max",
592 .data = &max_threads,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = &proc_dointvec,
596 },
597 {
598 .ctl_name = KERN_RANDOM,
599 .procname = "random",
600 .mode = 0555,
601 .child = random_table,
602 },
1da177e4
LT		 603 {
604 .ctl_name = KERN_OVERFLOWUID,
605 .procname = "overflowuid",
606 .data = &overflowuid,
607 .maxlen = sizeof(int),
608 .mode = 0644,
609 .proc_handler = &proc_dointvec_minmax,
610 .strategy = &sysctl_intvec,
611 .extra1 = &minolduid,
612 .extra2 = &maxolduid,
613 },
614 {
615 .ctl_name = KERN_OVERFLOWGID,
616 .procname = "overflowgid",
617 .data = &overflowgid,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = &proc_dointvec_minmax,
621 .strategy = &sysctl_intvec,
622 .extra1 = &minolduid,
623 .extra2 = &maxolduid,
624 },
347a8dc3 625#ifdef CONFIG_S390
1da177e4
LT		 626#ifdef CONFIG_MATHEMU
627 {
628 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
629 .procname = "ieee_emulation_warnings",
630 .data = &sysctl_ieee_emulation_warnings,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = &proc_dointvec,
634 },
1da177e4
LT		 635#endif
636 {
637 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
638 .procname = "userprocess_debug",
639 .data = &sysctl_userprocess_debug,
640 .maxlen = sizeof(int),
641 .mode = 0644,
642 .proc_handler = &proc_dointvec,
643 },
644#endif
645 {
646 .ctl_name = KERN_PIDMAX,
647 .procname = "pid_max",
648 .data = &pid_max,
649 .maxlen = sizeof (int),
650 .mode = 0644,
651 .proc_handler = &proc_dointvec_minmax,
652 .strategy = sysctl_intvec,
653 .extra1 = &pid_max_min,
654 .extra2 = &pid_max_max,
655 },
656 {
657 .ctl_name = KERN_PANIC_ON_OOPS,
658 .procname = "panic_on_oops",
659 .data = &panic_on_oops,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = &proc_dointvec,
663 },
7ef3d2fd
JP		 664#if defined CONFIG_PRINTK
665 {
666 .ctl_name = KERN_PRINTK,
667 .procname = "printk",
668 .data = &console_loglevel,
669 .maxlen = 4*sizeof(int),
670 .mode = 0644,
671 .proc_handler = &proc_dointvec,
672 },
1da177e4
LT		 673 {
674 .ctl_name = KERN_PRINTK_RATELIMIT,
675 .procname = "printk_ratelimit",
717115e1 676 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 677 .maxlen = sizeof(int),
678 .mode = 0644,
679 .proc_handler = &proc_dointvec_jiffies,
680 .strategy = &sysctl_jiffies,
681 },
682 {
683 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
684 .procname = "printk_ratelimit_burst",
717115e1 685 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = &proc_dointvec,
689 },
7ef3d2fd 690#endif
1da177e4
LT		 691 {
692 .ctl_name = KERN_NGROUPS_MAX,
693 .procname = "ngroups_max",
694 .data = &ngroups_max,
695 .maxlen = sizeof (int),
696 .mode = 0444,
697 .proc_handler = &proc_dointvec,
698 },
699#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
700 {
701 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
702 .procname = "unknown_nmi_panic",
703 .data = &unknown_nmi_panic,
704 .maxlen = sizeof (int),
705 .mode = 0644,
2fbe7b25 706 .proc_handler = &proc_dointvec,
1da177e4 707 },
407984f1 708 {
407984f1
DZ		 709 .procname = "nmi_watchdog",
710 .data = &nmi_watchdog_enabled,
711 .maxlen = sizeof (int),
712 .mode = 0644,
713 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 714 },
715#endif
716#if defined(CONFIG_X86)
8da5adda
DZ		 717 {
718 .ctl_name = KERN_PANIC_ON_NMI,
719 .procname = "panic_on_unrecovered_nmi",
720 .data = &panic_on_unrecovered_nmi,
721 .maxlen = sizeof(int),
722 .mode = 0644,
723 .proc_handler = &proc_dointvec,
724 },
1da177e4
LT		 725 {
726 .ctl_name = KERN_BOOTLOADER_TYPE,
727 .procname = "bootloader_type",
728 .data = &bootloader_type,
729 .maxlen = sizeof (int),
730 .mode = 0444,
731 .proc_handler = &proc_dointvec,
732 },
0741f4d2
CE		 733 {
734 .ctl_name = CTL_UNNUMBERED,
735 .procname = "kstack_depth_to_print",
736 .data = &kstack_depth_to_print,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = &proc_dointvec,
740 },
6e7c4025
IM		 741 {
742 .ctl_name = CTL_UNNUMBERED,
743 .procname = "io_delay_type",
744 .data = &io_delay_type,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = &proc_dointvec,
748 },
1da177e4 749#endif
7a9166e3 750#if defined(CONFIG_MMU)
1da177e4
LT		 751 {
752 .ctl_name = KERN_RANDOMIZE,
753 .procname = "randomize_va_space",
754 .data = &randomize_va_space,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = &proc_dointvec,
758 },
7a9166e3 759#endif
0152fb37 760#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 761 {
762 .ctl_name = KERN_SPIN_RETRY,
763 .procname = "spin_retry",
764 .data = &spin_retry,
765 .maxlen = sizeof (int),
766 .mode = 0644,
767 .proc_handler = &proc_dointvec,
768 },
c255d844 769#endif
673d5b43 770#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 771 {
c255d844 772 .procname = "acpi_video_flags",
77afcf78 773 .data = &acpi_realmode_flags,
c255d844
PM		 774 .maxlen = sizeof (unsigned long),
775 .mode = 0644,
7f99f06f 776 .proc_handler = &proc_doulongvec_minmax,
c255d844 777 },
d2b176ed
JS		 778#endif
779#ifdef CONFIG_IA64
780 {
781 .ctl_name = KERN_IA64_UNALIGNED,
782 .procname = "ignore-unaligned-usertrap",
783 .data = &no_unaligned_warning,
784 .maxlen = sizeof (int),
785 .mode = 0644,
786 .proc_handler = &proc_dointvec,
787 },
88fc241f
DC		 788 {
789 .ctl_name = CTL_UNNUMBERED,
790 .procname = "unaligned-dump-stack",
791 .data = &unaligned_dump_stack,
792 .maxlen = sizeof (int),
793 .mode = 0644,
794 .proc_handler = &proc_dointvec,
795 },
bebfa101 796#endif
c4f3b63f 797#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 798 {
799 .ctl_name = CTL_UNNUMBERED,
800 .procname = "softlockup_panic",
801 .data = &softlockup_panic,
802 .maxlen = sizeof(int),
803 .mode = 0644,
4dca10a9 804 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 805 .strategy = &sysctl_intvec,
806 .extra1 = &zero,
807 .extra2 = &one,
808 },
c4f3b63f
RT		 809 {
810 .ctl_name = CTL_UNNUMBERED,
811 .procname = "softlockup_thresh",
812 .data = &softlockup_thresh,
9383d967 813 .maxlen = sizeof(int),
c4f3b63f 814 .mode = 0644,
baf48f65 815 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 816 .strategy = &sysctl_intvec,
9383d967 817 .extra1 = &neg_one,
c4f3b63f
RT		 818 .extra2 = &sixty,
819 },
e162b39a
MSB		 820#endif
821#ifdef CONFIG_DETECT_HUNG_TASK
822 {
823 .ctl_name = CTL_UNNUMBERED,
824 .procname = "hung_task_panic",
825 .data = &sysctl_hung_task_panic,
826 .maxlen = sizeof(int),
827 .mode = 0644,
828 .proc_handler = &proc_dointvec_minmax,
829 .strategy = &sysctl_intvec,
830 .extra1 = &zero,
831 .extra2 = &one,
832 },
82a1fcb9
IM		 833 {
834 .ctl_name = CTL_UNNUMBERED,
835 .procname = "hung_task_check_count",
836 .data = &sysctl_hung_task_check_count,
90739081 837 .maxlen = sizeof(unsigned long),
82a1fcb9 838 .mode = 0644,
90739081 839 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 840 .strategy = &sysctl_intvec,
841 },
842 {
843 .ctl_name = CTL_UNNUMBERED,
844 .procname = "hung_task_timeout_secs",
845 .data = &sysctl_hung_task_timeout_secs,
90739081 846 .maxlen = sizeof(unsigned long),
82a1fcb9 847 .mode = 0644,
e162b39a 848 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 849 .strategy = &sysctl_intvec,
850 },
851 {
852 .ctl_name = CTL_UNNUMBERED,
853 .procname = "hung_task_warnings",
854 .data = &sysctl_hung_task_warnings,
90739081 855 .maxlen = sizeof(unsigned long),
82a1fcb9 856 .mode = 0644,
90739081 857 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 858 .strategy = &sysctl_intvec,
859 },
c4f3b63f 860#endif
bebfa101
AK		 861#ifdef CONFIG_COMPAT
862 {
863 .ctl_name = KERN_COMPAT_LOG,
864 .procname = "compat-log",
865 .data = &compat_log,
866 .maxlen = sizeof (int),
867 .mode = 0644,
868 .proc_handler = &proc_dointvec,
869 },
951f22d5 870#endif
23f78d4a
IM		 871#ifdef CONFIG_RT_MUTEXES
872 {
873 .ctl_name = KERN_MAX_LOCK_DEPTH,
874 .procname = "max_lock_depth",
875 .data = &max_lock_depth,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = &proc_dointvec,
879 },
5096add8 880#endif
10a0a8d4
JF		 881 {
882 .ctl_name = CTL_UNNUMBERED,
883 .procname = "poweroff_cmd",
884 .data = &poweroff_cmd,
885 .maxlen = POWEROFF_CMD_PATH_LEN,
886 .mode = 0644,
887 .proc_handler = &proc_dostring,
888 .strategy = &sysctl_string,
889 },
0b77f5bf
DH		 890#ifdef CONFIG_KEYS
891 {
892 .ctl_name = CTL_UNNUMBERED,
893 .procname = "keys",
894 .mode = 0555,
895 .child = key_sysctls,
896 },
897#endif
31a72bce
PM		 898#ifdef CONFIG_RCU_TORTURE_TEST
899 {
900 .ctl_name = CTL_UNNUMBERED,
901 .procname = "rcutorture_runnable",
902 .data = &rcutorture_runnable,
903 .maxlen = sizeof(int),
904 .mode = 0644,
905 .proc_handler = &proc_dointvec,
906 },
907#endif
12e22c5e
DH		 908#ifdef CONFIG_SLOW_WORK
909 {
910 .ctl_name = CTL_UNNUMBERED,
911 .procname = "slow-work",
912 .mode = 0555,
913 .child = slow_work_sysctls,
914 },
915#endif
ed2c12f3
AM		 916/*
917 * NOTE: do not add new entries to this table unless you have read
918 * Documentation/sysctl/ctl_unnumbered.txt
919 */
1da177e4
LT		 920 { .ctl_name = 0 }
921};
922
d8217f07 923static struct ctl_table vm_table[] = {
1da177e4
LT		 924 {
925 .ctl_name = VM_OVERCOMMIT_MEMORY,
926 .procname = "overcommit_memory",
927 .data = &sysctl_overcommit_memory,
928 .maxlen = sizeof(sysctl_overcommit_memory),
929 .mode = 0644,
930 .proc_handler = &proc_dointvec,
931 },
fadd8fbd
KH		 932 {
933 .ctl_name = VM_PANIC_ON_OOM,
934 .procname = "panic_on_oom",
935 .data = &sysctl_panic_on_oom,
936 .maxlen = sizeof(sysctl_panic_on_oom),
937 .mode = 0644,
938 .proc_handler = &proc_dointvec,
939 },
fe071d7e
DR		 940 {
941 .ctl_name = CTL_UNNUMBERED,
942 .procname = "oom_kill_allocating_task",
943 .data = &sysctl_oom_kill_allocating_task,
944 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
945 .mode = 0644,
946 .proc_handler = &proc_dointvec,
947 },
fef1bdd6
DR		 948 {
949 .ctl_name = CTL_UNNUMBERED,
950 .procname = "oom_dump_tasks",
951 .data = &sysctl_oom_dump_tasks,
952 .maxlen = sizeof(sysctl_oom_dump_tasks),
953 .mode = 0644,
954 .proc_handler = &proc_dointvec,
955 },
1da177e4
LT		 956 {
957 .ctl_name = VM_OVERCOMMIT_RATIO,
958 .procname = "overcommit_ratio",
959 .data = &sysctl_overcommit_ratio,
960 .maxlen = sizeof(sysctl_overcommit_ratio),
961 .mode = 0644,
962 .proc_handler = &proc_dointvec,
963 },
964 {
965 .ctl_name = VM_PAGE_CLUSTER,
966 .procname = "page-cluster",
967 .data = &page_cluster,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = &proc_dointvec,
971 },
972 {
973 .ctl_name = VM_DIRTY_BACKGROUND,
974 .procname = "dirty_background_ratio",
975 .data = &dirty_background_ratio,
976 .maxlen = sizeof(dirty_background_ratio),
977 .mode = 0644,
2da02997 978 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 979 .strategy = &sysctl_intvec,
980 .extra1 = &zero,
981 .extra2 = &one_hundred,
982 },
2da02997
DR		 983 {
984 .ctl_name = CTL_UNNUMBERED,
985 .procname = "dirty_background_bytes",
986 .data = &dirty_background_bytes,
987 .maxlen = sizeof(dirty_background_bytes),
988 .mode = 0644,
989 .proc_handler = &dirty_background_bytes_handler,
990 .strategy = &sysctl_intvec,
fc3501d4 991 .extra1 = &one_ul,
2da02997 992 },
1da177e4
LT		 993 {
994 .ctl_name = VM_DIRTY_RATIO,
995 .procname = "dirty_ratio",
996 .data = &vm_dirty_ratio,
997 .maxlen = sizeof(vm_dirty_ratio),
998 .mode = 0644,
04fbfdc1 999 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1000 .strategy = &sysctl_intvec,
1001 .extra1 = &zero,
1002 .extra2 = &one_hundred,
1003 },
2da02997
DR		 1004 {
1005 .ctl_name = CTL_UNNUMBERED,
1006 .procname = "dirty_bytes",
1007 .data = &vm_dirty_bytes,
1008 .maxlen = sizeof(vm_dirty_bytes),
1009 .mode = 0644,
1010 .proc_handler = &dirty_bytes_handler,
1011 .strategy = &sysctl_intvec,
9e4a5bda 1012 .extra1 = &dirty_bytes_min,
2da02997 1013 },
1da177e4 1014 {
1da177e4 1015 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1016 .data = &dirty_writeback_interval,
1017 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1018 .mode = 0644,
1019 .proc_handler = &dirty_writeback_centisecs_handler,
1020 },
1021 {
1da177e4 1022 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1023 .data = &dirty_expire_interval,
1024 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1025 .mode = 0644,
704503d8 1026 .proc_handler = &proc_dointvec,
1da177e4
LT		 1027 },
1028 {
1029 .ctl_name = VM_NR_PDFLUSH_THREADS,
1030 .procname = "nr_pdflush_threads",
1031 .data = &nr_pdflush_threads,
1032 .maxlen = sizeof nr_pdflush_threads,
1033 .mode = 0444 /* read-only*/,
1034 .proc_handler = &proc_dointvec,
1035 },
fafd688e
PM		 1036 {
1037 .ctl_name = CTL_UNNUMBERED,
1038 .procname = "nr_pdflush_threads_min",
1039 .data = &nr_pdflush_threads_min,
1040 .maxlen = sizeof nr_pdflush_threads_min,
1041 .mode = 0644 /* read-write */,
1042 .proc_handler = &proc_dointvec_minmax,
1043 .strategy = &sysctl_intvec,
1044 .extra1 = &one,
1045 .extra2 = &nr_pdflush_threads_max,
1046 },
1047 {
1048 .ctl_name = CTL_UNNUMBERED,
1049 .procname = "nr_pdflush_threads_max",
1050 .data = &nr_pdflush_threads_max,
1051 .maxlen = sizeof nr_pdflush_threads_max,
1052 .mode = 0644 /* read-write */,
1053 .proc_handler = &proc_dointvec_minmax,
1054 .strategy = &sysctl_intvec,
1055 .extra1 = &nr_pdflush_threads_min,
1056 .extra2 = &one_thousand,
1057 },
1da177e4
LT		 1058 {
1059 .ctl_name = VM_SWAPPINESS,
1060 .procname = "swappiness",
1061 .data = &vm_swappiness,
1062 .maxlen = sizeof(vm_swappiness),
1063 .mode = 0644,
1064 .proc_handler = &proc_dointvec_minmax,
1065 .strategy = &sysctl_intvec,
1066 .extra1 = &zero,
1067 .extra2 = &one_hundred,
1068 },
1069#ifdef CONFIG_HUGETLB_PAGE
1070 {
1da177e4 1071 .procname = "nr_hugepages",
e5ff2159 1072 .data = NULL,
1da177e4
LT		 1073 .maxlen = sizeof(unsigned long),
1074 .mode = 0644,
1075 .proc_handler = &hugetlb_sysctl_handler,
1076 .extra1 = (void *)&hugetlb_zero,
1077 .extra2 = (void *)&hugetlb_infinity,
1078 },
1079 {
1080 .ctl_name = VM_HUGETLB_GROUP,
1081 .procname = "hugetlb_shm_group",
1082 .data = &sysctl_hugetlb_shm_group,
1083 .maxlen = sizeof(gid_t),
1084 .mode = 0644,
1085 .proc_handler = &proc_dointvec,
1086 },
396faf03
MG		 1087 {
1088 .ctl_name = CTL_UNNUMBERED,
1089 .procname = "hugepages_treat_as_movable",
1090 .data = &hugepages_treat_as_movable,
1091 .maxlen = sizeof(int),
1092 .mode = 0644,
1093 .proc_handler = &hugetlb_treat_movable_handler,
1094 },
d1c3fb1f
NA		 1095 {
1096 .ctl_name = CTL_UNNUMBERED,
1097 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1098 .data = NULL,
1099 .maxlen = sizeof(unsigned long),
d1c3fb1f 1100 .mode = 0644,
a3d0c6aa 1101 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1102 .extra1 = (void *)&hugetlb_zero,
1103 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1104 },
1da177e4
LT		 1105#endif
1106 {
1107 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1108 .procname = "lowmem_reserve_ratio",
1109 .data = &sysctl_lowmem_reserve_ratio,
1110 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1111 .mode = 0644,
1112 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1113 .strategy = &sysctl_intvec,
1114 },
9d0243bc
AM		 1115 {
1116 .ctl_name = VM_DROP_PAGECACHE,
1117 .procname = "drop_caches",
1118 .data = &sysctl_drop_caches,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = drop_caches_sysctl_handler,
1122 .strategy = &sysctl_intvec,
1123 },
1da177e4
LT		 1124 {
1125 .ctl_name = VM_MIN_FREE_KBYTES,
1126 .procname = "min_free_kbytes",
1127 .data = &min_free_kbytes,
1128 .maxlen = sizeof(min_free_kbytes),
1129 .mode = 0644,
1130 .proc_handler = &min_free_kbytes_sysctl_handler,
1131 .strategy = &sysctl_intvec,
1132 .extra1 = &zero,
1133 },
8ad4b1fb
RS		 1134 {
1135 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1136 .procname = "percpu_pagelist_fraction",
1137 .data = &percpu_pagelist_fraction,
1138 .maxlen = sizeof(percpu_pagelist_fraction),
1139 .mode = 0644,
1140 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1141 .strategy = &sysctl_intvec,
1142 .extra1 = &min_percpu_pagelist_fract,
1143 },
1da177e4
LT		 1144#ifdef CONFIG_MMU
1145 {
1146 .ctl_name = VM_MAX_MAP_COUNT,
1147 .procname = "max_map_count",
1148 .data = &sysctl_max_map_count,
1149 .maxlen = sizeof(sysctl_max_map_count),
1150 .mode = 0644,
1151 .proc_handler = &proc_dointvec
1152 },
dd8632a1
PM		 1153#else
1154 {
1155 .ctl_name = CTL_UNNUMBERED,
1156 .procname = "nr_trim_pages",
1157 .data = &sysctl_nr_trim_pages,
1158 .maxlen = sizeof(sysctl_nr_trim_pages),
1159 .mode = 0644,
1160 .proc_handler = &proc_dointvec_minmax,
1161 .strategy = &sysctl_intvec,
1162 .extra1 = &zero,
1163 },
1da177e4
LT		 1164#endif
1165 {
1166 .ctl_name = VM_LAPTOP_MODE,
1167 .procname = "laptop_mode",
1168 .data = &laptop_mode,
1169 .maxlen = sizeof(laptop_mode),
1170 .mode = 0644,
ed5b43f1
BS		 1171 .proc_handler = &proc_dointvec_jiffies,
1172 .strategy = &sysctl_jiffies,
1da177e4
LT		 1173 },
1174 {
1175 .ctl_name = VM_BLOCK_DUMP,
1176 .procname = "block_dump",
1177 .data = &block_dump,
1178 .maxlen = sizeof(block_dump),
1179 .mode = 0644,
1180 .proc_handler = &proc_dointvec,
1181 .strategy = &sysctl_intvec,
1182 .extra1 = &zero,
1183 },
1184 {
1185 .ctl_name = VM_VFS_CACHE_PRESSURE,
1186 .procname = "vfs_cache_pressure",
1187 .data = &sysctl_vfs_cache_pressure,
1188 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1189 .mode = 0644,
1190 .proc_handler = &proc_dointvec,
1191 .strategy = &sysctl_intvec,
1192 .extra1 = &zero,
1193 },
1194#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1195 {
1196 .ctl_name = VM_LEGACY_VA_LAYOUT,
1197 .procname = "legacy_va_layout",
1198 .data = &sysctl_legacy_va_layout,
1199 .maxlen = sizeof(sysctl_legacy_va_layout),
1200 .mode = 0644,
1201 .proc_handler = &proc_dointvec,
1202 .strategy = &sysctl_intvec,
1203 .extra1 = &zero,
1204 },
1205#endif
1743660b
CL		 1206#ifdef CONFIG_NUMA
1207 {
1208 .ctl_name = VM_ZONE_RECLAIM_MODE,
1209 .procname = "zone_reclaim_mode",
1210 .data = &zone_reclaim_mode,
1211 .maxlen = sizeof(zone_reclaim_mode),
1212 .mode = 0644,
1213 .proc_handler = &proc_dointvec,
c84db23c
CL		 1214 .strategy = &sysctl_intvec,
1215 .extra1 = &zero,
1743660b 1216 },
9614634f
CL		 1217 {
1218 .ctl_name = VM_MIN_UNMAPPED,
1219 .procname = "min_unmapped_ratio",
1220 .data = &sysctl_min_unmapped_ratio,
1221 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1222 .mode = 0644,
1223 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1224 .strategy = &sysctl_intvec,
1225 .extra1 = &zero,
1226 .extra2 = &one_hundred,
1227 },
0ff38490
CL		 1228 {
1229 .ctl_name = VM_MIN_SLAB,
1230 .procname = "min_slab_ratio",
1231 .data = &sysctl_min_slab_ratio,
1232 .maxlen = sizeof(sysctl_min_slab_ratio),
1233 .mode = 0644,
1234 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1235 .strategy = &sysctl_intvec,
1236 .extra1 = &zero,
1237 .extra2 = &one_hundred,
1238 },
e6e5494c 1239#endif
77461ab3
CL		 1240#ifdef CONFIG_SMP
1241 {
1242 .ctl_name = CTL_UNNUMBERED,
1243 .procname = "stat_interval",
1244 .data = &sysctl_stat_interval,
1245 .maxlen = sizeof(sysctl_stat_interval),
1246 .mode = 0644,
1247 .proc_handler = &proc_dointvec_jiffies,
1248 .strategy = &sysctl_jiffies,
1249 },
1250#endif
ed032189
EP		 1251#ifdef CONFIG_SECURITY
1252 {
1253 .ctl_name = CTL_UNNUMBERED,
1254 .procname = "mmap_min_addr",
1255 .data = &mmap_min_addr,
1256 .maxlen = sizeof(unsigned long),
1257 .mode = 0644,
1258 .proc_handler = &proc_doulongvec_minmax,
1259 },
8daec965 1260#endif
f0c0b2b8
KH		 1261#ifdef CONFIG_NUMA
1262 {
1263 .ctl_name = CTL_UNNUMBERED,
1264 .procname = "numa_zonelist_order",
1265 .data = &numa_zonelist_order,
1266 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1267 .mode = 0644,
1268 .proc_handler = &numa_zonelist_order_handler,
1269 .strategy = &sysctl_string,
1270 },
1271#endif
2b8232ce 1272#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1273 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1274 {
1275 .ctl_name = VM_VDSO_ENABLED,
1276 .procname = "vdso_enabled",
1277 .data = &vdso_enabled,
1278 .maxlen = sizeof(vdso_enabled),
1279 .mode = 0644,
1280 .proc_handler = &proc_dointvec,
1281 .strategy = &sysctl_intvec,
1282 .extra1 = &zero,
1283 },
1da177e4 1284#endif
195cf453
BG		 1285#ifdef CONFIG_HIGHMEM
1286 {
1287 .ctl_name = CTL_UNNUMBERED,
1288 .procname = "highmem_is_dirtyable",
1289 .data = &vm_highmem_is_dirtyable,
1290 .maxlen = sizeof(vm_highmem_is_dirtyable),
1291 .mode = 0644,
1292 .proc_handler = &proc_dointvec_minmax,
1293 .strategy = &sysctl_intvec,
1294 .extra1 = &zero,
1295 .extra2 = &one,
1296 },
1297#endif
4be6f6bb
PZ		 1298#ifdef CONFIG_UNEVICTABLE_LRU
1299 {
1300 .ctl_name = CTL_UNNUMBERED,
1301 .procname = "scan_unevictable_pages",
1302 .data = &scan_unevictable_pages,
1303 .maxlen = sizeof(scan_unevictable_pages),
1304 .mode = 0644,
1305 .proc_handler = &scan_unevictable_handler,
1306 },
1307#endif
2be7fe07
AM		 1308/*
1309 * NOTE: do not add new entries to this table unless you have read
1310 * Documentation/sysctl/ctl_unnumbered.txt
1311 */
1da177e4
LT		 1312 { .ctl_name = 0 }
1313};
1314
2abc26fc 1315#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1316static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1317 { .ctl_name = 0 }
1318};
1319#endif
1320
d8217f07 1321static struct ctl_table fs_table[] = {
1da177e4
LT		 1322 {
1323 .ctl_name = FS_NRINODE,
1324 .procname = "inode-nr",
1325 .data = &inodes_stat,
1326 .maxlen = 2*sizeof(int),
1327 .mode = 0444,
1328 .proc_handler = &proc_dointvec,
1329 },
1330 {
1331 .ctl_name = FS_STATINODE,
1332 .procname = "inode-state",
1333 .data = &inodes_stat,
1334 .maxlen = 7*sizeof(int),
1335 .mode = 0444,
1336 .proc_handler = &proc_dointvec,
1337 },
1338 {
1da177e4
LT		 1339 .procname = "file-nr",
1340 .data = &files_stat,
1341 .maxlen = 3*sizeof(int),
1342 .mode = 0444,
529bf6be 1343 .proc_handler = &proc_nr_files,
1da177e4
LT		 1344 },
1345 {
1346 .ctl_name = FS_MAXFILE,
1347 .procname = "file-max",
1348 .data = &files_stat.max_files,
1349 .maxlen = sizeof(int),
1350 .mode = 0644,
1351 .proc_handler = &proc_dointvec,
1352 },
9cfe015a
ED		 1353 {
1354 .ctl_name = CTL_UNNUMBERED,
1355 .procname = "nr_open",
1356 .data = &sysctl_nr_open,
1357 .maxlen = sizeof(int),
1358 .mode = 0644,
eceea0b3
AV		 1359 .proc_handler = &proc_dointvec_minmax,
1360 .extra1 = &sysctl_nr_open_min,
1361 .extra2 = &sysctl_nr_open_max,
9cfe015a 1362 },
1da177e4
LT		 1363 {
1364 .ctl_name = FS_DENTRY,
1365 .procname = "dentry-state",
1366 .data = &dentry_stat,
1367 .maxlen = 6*sizeof(int),
1368 .mode = 0444,
1369 .proc_handler = &proc_dointvec,
1370 },
1371 {
1372 .ctl_name = FS_OVERFLOWUID,
1373 .procname = "overflowuid",
1374 .data = &fs_overflowuid,
1375 .maxlen = sizeof(int),
1376 .mode = 0644,
1377 .proc_handler = &proc_dointvec_minmax,
1378 .strategy = &sysctl_intvec,
1379 .extra1 = &minolduid,
1380 .extra2 = &maxolduid,
1381 },
1382 {
1383 .ctl_name = FS_OVERFLOWGID,
1384 .procname = "overflowgid",
1385 .data = &fs_overflowgid,
1386 .maxlen = sizeof(int),
1387 .mode = 0644,
1388 .proc_handler = &proc_dointvec_minmax,
1389 .strategy = &sysctl_intvec,
1390 .extra1 = &minolduid,
1391 .extra2 = &maxolduid,
1392 },
bfcd17a6 1393#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1394 {
1395 .ctl_name = FS_LEASES,
1396 .procname = "leases-enable",
1397 .data = &leases_enable,
1398 .maxlen = sizeof(int),
1399 .mode = 0644,
1400 .proc_handler = &proc_dointvec,
1401 },
bfcd17a6 1402#endif
1da177e4
LT		 1403#ifdef CONFIG_DNOTIFY
1404 {
1405 .ctl_name = FS_DIR_NOTIFY,
1406 .procname = "dir-notify-enable",
1407 .data = &dir_notify_enable,
1408 .maxlen = sizeof(int),
1409 .mode = 0644,
1410 .proc_handler = &proc_dointvec,
1411 },
1412#endif
1413#ifdef CONFIG_MMU
bfcd17a6 1414#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1415 {
1416 .ctl_name = FS_LEASE_TIME,
1417 .procname = "lease-break-time",
1418 .data = &lease_break_time,
1419 .maxlen = sizeof(int),
1420 .mode = 0644,
8e654fba 1421 .proc_handler = &proc_dointvec,
1da177e4 1422 },
bfcd17a6 1423#endif
ebf3f09c 1424#ifdef CONFIG_AIO
1da177e4 1425 {
1da177e4
LT		 1426 .procname = "aio-nr",
1427 .data = &aio_nr,
1428 .maxlen = sizeof(aio_nr),
1429 .mode = 0444,
d55b5fda 1430 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1431 },
1432 {
1da177e4
LT		 1433 .procname = "aio-max-nr",
1434 .data = &aio_max_nr,
1435 .maxlen = sizeof(aio_max_nr),
1436 .mode = 0644,
d55b5fda 1437 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1438 },
ebf3f09c 1439#endif /* CONFIG_AIO */
2d9048e2 1440#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1441 {
1442 .ctl_name = FS_INOTIFY,
1443 .procname = "inotify",
1444 .mode = 0555,
1445 .child = inotify_table,
1446 },
1447#endif
7ef9964e
DL		 1448#ifdef CONFIG_EPOLL
1449 {
1450 .procname = "epoll",
1451 .mode = 0555,
1452 .child = epoll_table,
1453 },
1454#endif
1da177e4 1455#endif
d6e71144
AC		 1456 {
1457 .ctl_name = KERN_SETUID_DUMPABLE,
1458 .procname = "suid_dumpable",
1459 .data = &suid_dumpable,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
8e654fba
MW		 1462 .proc_handler = &proc_dointvec_minmax,
1463 .strategy = &sysctl_intvec,
1464 .extra1 = &zero,
1465 .extra2 = &two,
d6e71144 1466 },
2abc26fc
EB		 1467#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1468 {
1469 .ctl_name = CTL_UNNUMBERED,
1470 .procname = "binfmt_misc",
1471 .mode = 0555,
1472 .child = binfmt_misc_table,
1473 },
1474#endif
2be7fe07
AM		 1475/*
1476 * NOTE: do not add new entries to this table unless you have read
1477 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1478 */
1da177e4
LT		 1479 { .ctl_name = 0 }
1480};
1481
d8217f07 1482static struct ctl_table debug_table[] = {
d0c3d534 1483#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1484 {
1485 .ctl_name = CTL_UNNUMBERED,
1486 .procname = "exception-trace",
1487 .data = &show_unhandled_signals,
1488 .maxlen = sizeof(int),
1489 .mode = 0644,
1490 .proc_handler = proc_dointvec
1491 },
1492#endif
1da177e4
LT		 1493 { .ctl_name = 0 }
1494};
1495
d8217f07 1496static struct ctl_table dev_table[] = {
1da177e4 1497 { .ctl_name = 0 }
0eeca283 1498};
1da177e4 1499
330d57fb
AV		 1500static DEFINE_SPINLOCK(sysctl_lock);
1501
1502/* called under sysctl_lock */
1503static int use_table(struct ctl_table_header *p)
1504{
1505 if (unlikely(p->unregistering))
1506 return 0;
1507 p->used++;
1508 return 1;
1509}
1510
1511/* called under sysctl_lock */
1512static void unuse_table(struct ctl_table_header *p)
1513{
1514 if (!--p->used)
1515 if (unlikely(p->unregistering))
1516 complete(p->unregistering);
1517}
1518
1519/* called under sysctl_lock, will reacquire if has to wait */
1520static void start_unregistering(struct ctl_table_header *p)
1521{
1522 /*
1523 * if p->used is 0, nobody will ever touch that entry again;
1524 * we'll eliminate all paths to it before dropping sysctl_lock
1525 */
1526 if (unlikely(p->used)) {
1527 struct completion wait;
1528 init_completion(&wait);
1529 p->unregistering = &wait;
1530 spin_unlock(&sysctl_lock);
1531 wait_for_completion(&wait);
1532 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1533 } else {
1534 /* anything non-NULL; we'll never dereference it */
1535 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1536 }
1537 /*
1538 * do not remove from the list until nobody holds it; walking the
1539 * list in do_sysctl() relies on that.
1540 */
1541 list_del_init(&p->ctl_entry);
1542}
1543
f7e6ced4
AV		 1544void sysctl_head_get(struct ctl_table_header *head)
1545{
1546 spin_lock(&sysctl_lock);
1547 head->count++;
1548 spin_unlock(&sysctl_lock);
1549}
1550
1551void sysctl_head_put(struct ctl_table_header *head)
1552{
1553 spin_lock(&sysctl_lock);
1554 if (!--head->count)
1555 kfree(head);
1556 spin_unlock(&sysctl_lock);
1557}
1558
1559struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1560{
1561 if (!head)
1562 BUG();
1563 spin_lock(&sysctl_lock);
1564 if (!use_table(head))
1565 head = ERR_PTR(-ENOENT);
1566 spin_unlock(&sysctl_lock);
1567 return head;
1568}
1569
805b5d5e
EB		 1570void sysctl_head_finish(struct ctl_table_header *head)
1571{
1572 if (!head)
1573 return;
1574 spin_lock(&sysctl_lock);
1575 unuse_table(head);
1576 spin_unlock(&sysctl_lock);
1577}
1578
73455092
AV		 1579static struct ctl_table_set *
1580lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1581{
1582 struct ctl_table_set *set = &root->default_set;
1583 if (root->lookup)
1584 set = root->lookup(root, namespaces);
1585 return set;
1586}
1587
e51b6ba0
EB		 1588static struct list_head *
1589lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1590{
73455092
AV		 1591 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1592 return &set->list;
e51b6ba0
EB		 1593}
1594
1595struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1596 struct ctl_table_header *prev)
1597{
1598 struct ctl_table_root *root;
1599 struct list_head *header_list;
805b5d5e
EB		 1600 struct ctl_table_header *head;
1601 struct list_head *tmp;
e51b6ba0 1602
805b5d5e
EB		 1603 spin_lock(&sysctl_lock);
1604 if (prev) {
e51b6ba0 1605 head = prev;
805b5d5e
EB		 1606 tmp = &prev->ctl_entry;
1607 unuse_table(prev);
1608 goto next;
1609 }
1610 tmp = &root_table_header.ctl_entry;
1611 for (;;) {
1612 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1613
1614 if (!use_table(head))
1615 goto next;
1616 spin_unlock(&sysctl_lock);
1617 return head;
1618 next:
e51b6ba0 1619 root = head->root;
805b5d5e 1620 tmp = tmp->next;
e51b6ba0
EB		 1621 header_list = lookup_header_list(root, namespaces);
1622 if (tmp != header_list)
1623 continue;
1624
1625 do {
1626 root = list_entry(root->root_list.next,
1627 struct ctl_table_root, root_list);
1628 if (root == &sysctl_table_root)
1629 goto out;
1630 header_list = lookup_header_list(root, namespaces);
1631 } while (list_empty(header_list));
1632 tmp = header_list->next;
805b5d5e 1633 }
e51b6ba0 1634out:
805b5d5e
EB		 1635 spin_unlock(&sysctl_lock);
1636 return NULL;
1637}
1638
e51b6ba0
EB		 1639struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1640{
1641 return __sysctl_head_next(current->nsproxy, prev);
1642}
1643
1644void register_sysctl_root(struct ctl_table_root *root)
1645{
1646 spin_lock(&sysctl_lock);
1647 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1648 spin_unlock(&sysctl_lock);
1649}
1650
b89a8171 1651#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1652/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1653static int do_sysctl_strategy(struct ctl_table_root *root,
1654 struct ctl_table *table,
2c4c7155
PE		 1655 void __user *oldval, size_t __user *oldlenp,
1656 void __user *newval, size_t newlen)
1657{
1658 int op = 0, rc;
1659
1660 if (oldval)
e6305c43 1661 op |= MAY_READ;
2c4c7155 1662 if (newval)
e6305c43 1663 op |= MAY_WRITE;
d7321cd6 1664 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1665 return -EPERM;
1666
1667 if (table->strategy) {
f221e726 1668 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1669 if (rc < 0)
1670 return rc;
1671 if (rc > 0)
1672 return 0;
1673 }
1674
1675 /* If there is no strategy routine, or if the strategy returns
1676 * zero, proceed with automatic r/w */
1677 if (table->data && table->maxlen) {
f221e726 1678 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1679 if (rc < 0)
1680 return rc;
1681 }
1682 return 0;
1683}
1684
1685static int parse_table(int __user *name, int nlen,
1686 void __user *oldval, size_t __user *oldlenp,
1687 void __user *newval, size_t newlen,
d7321cd6 1688 struct ctl_table_root *root,
2c4c7155
PE		 1689 struct ctl_table *table)
1690{
1691 int n;
1692repeat:
1693 if (!nlen)
1694 return -ENOTDIR;
1695 if (get_user(n, name))
1696 return -EFAULT;
1697 for ( ; table->ctl_name || table->procname; table++) {
1698 if (!table->ctl_name)
1699 continue;
1700 if (n == table->ctl_name) {
1701 int error;
1702 if (table->child) {
e6305c43 1703 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1704 return -EPERM;
1705 name++;
1706 nlen--;
1707 table = table->child;
1708 goto repeat;
1709 }
f221e726 1710 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1711 oldval, oldlenp,
1712 newval, newlen);
1713 return error;
1714 }
1715 }
1716 return -ENOTDIR;
1717}
1718
1da177e4
LT		 1719int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1720 void __user *newval, size_t newlen)
1721{
805b5d5e 1722 struct ctl_table_header *head;
330d57fb 1723 int error = -ENOTDIR;
1da177e4
LT		 1724
1725 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1726 return -ENOTDIR;
1727 if (oldval) {
1728 int old_len;
1729 if (!oldlenp || get_user(old_len, oldlenp))
1730 return -EFAULT;
1731 }
330d57fb 1732
805b5d5e
EB		 1733 for (head = sysctl_head_next(NULL); head;
1734 head = sysctl_head_next(head)) {
330d57fb 1735 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1736 newval, newlen,
1737 head->root, head->ctl_table);
805b5d5e
EB		 1738 if (error != -ENOTDIR) {
1739 sysctl_head_finish(head);
330d57fb 1740 break;
805b5d5e
EB		 1741 }
1742 }
330d57fb 1743 return error;
1da177e4
LT		 1744}
1745
1e7bfb21 1746SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1747{
1748 struct __sysctl_args tmp;
1749 int error;
1750
1751 if (copy_from_user(&tmp, args, sizeof(tmp)))
1752 return -EFAULT;
1753
7058cb02
EB		 1754 error = deprecated_sysctl_warning(&tmp);
1755 if (error)
1756 goto out;
1757
1da177e4
LT		 1758 lock_kernel();
1759 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1760 tmp.newval, tmp.newlen);
1761 unlock_kernel();
7058cb02 1762out:
1da177e4
LT		 1763 return error;
1764}
b89a8171 1765#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1766
1767/*
1ff007eb 1768 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1769 * some sysctl variables are readonly even to root.
1770 */
1771
1772static int test_perm(int mode, int op)
1773{
76aac0e9 1774 if (!current_euid())
1da177e4
LT		 1775 mode >>= 6;
1776 else if (in_egroup_p(0))
1777 mode >>= 3;
e6305c43 1778 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1779 return 0;
1780 return -EACCES;
1781}
1782
d7321cd6 1783int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1784{
1785 int error;
d7321cd6
PE		 1786 int mode;
1787
e6305c43 1788 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1789 if (error)
1790 return error;
d7321cd6
PE		 1791
1792 if (root->permissions)
1793 mode = root->permissions(root, current->nsproxy, table);
1794 else
1795 mode = table->mode;
1796
1797 return test_perm(mode, op);
1da177e4
LT		 1798}
1799
d912b0cc
EB		 1800static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1801{
1802 for (; table->ctl_name || table->procname; table++) {
1803 table->parent = parent;
1804 if (table->child)
1805 sysctl_set_parent(table, table->child);
1806 }
1807}
1808
1809static __init int sysctl_init(void)
1810{
1811 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1812#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1813 {
1814 int err;
1815 err = sysctl_check_table(current->nsproxy, root_table);
1816 }
1817#endif
d912b0cc
EB		 1818 return 0;
1819}
1820
1821core_initcall(sysctl_init);
1822
bfbcf034
AV		 1823static struct ctl_table *is_branch_in(struct ctl_table *branch,
1824 struct ctl_table *table)
ae7edecc
AV		 1825{
1826 struct ctl_table *p;
1827 const char *s = branch->procname;
1828
1829 /* branch should have named subdirectory as its first element */
1830 if (!s || !branch->child)
bfbcf034 1831 return NULL;
ae7edecc
AV		 1832
1833 /* ... and nothing else */
1834 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1835 return NULL;
ae7edecc
AV		 1836
1837 /* table should contain subdirectory with the same name */
1838 for (p = table; p->procname || p->ctl_name; p++) {
1839 if (!p->child)
1840 continue;
1841 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1842 return p;
ae7edecc 1843 }
bfbcf034 1844 return NULL;
ae7edecc
AV		 1845}
1846
1847/* see if attaching q to p would be an improvement */
1848static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1849{
1850 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1851 struct ctl_table *next;
ae7edecc
AV		 1852 int is_better = 0;
1853 int not_in_parent = !p->attached_by;
1854
bfbcf034 1855 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1856 if (by == q->attached_by)
1857 is_better = 1;
1858 if (to == p->attached_by)
1859 not_in_parent = 1;
1860 by = by->child;
bfbcf034 1861 to = next->child;
ae7edecc
AV		 1862 }
1863
1864 if (is_better && not_in_parent) {
1865 q->attached_by = by;
1866 q->attached_to = to;
1867 q->parent = p;
1868 }
1869}
1870
1da177e4 1871/**
e51b6ba0
EB		 1872 * __register_sysctl_paths - register a sysctl hierarchy
1873 * @root: List of sysctl headers to register on
1874 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1875 * @path: The path to the directory the sysctl table is in.
1da177e4 1876 * @table: the top-level table structure
1da177e4
LT		 1877 *
1878 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1879 * array. A completely 0 filled entry terminates the table.
1da177e4 1880 *
d8217f07 1881 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1882 *
1883 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1884 * must be unique within that level of sysctl
1885 *
1886 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1887 * enter a sysctl file
1888 *
1889 * data - a pointer to data for use by proc_handler
1890 *
1891 * maxlen - the maximum size in bytes of the data
1892 *
1893 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1894 *
1895 * child - a pointer to the child sysctl table if this entry is a directory, or
1896 * %NULL.
1897 *
1898 * proc_handler - the text handler routine (described below)
1899 *
1900 * strategy - the strategy routine (described below)
1901 *
1902 * de - for internal use by the sysctl routines
1903 *
1904 * extra1, extra2 - extra pointers usable by the proc handler routines
1905 *
1906 * Leaf nodes in the sysctl tree will be represented by a single file
1907 * under /proc; non-leaf nodes will be represented by directories.
1908 *
1909 * sysctl(2) can automatically manage read and write requests through
1910 * the sysctl table. The data and maxlen fields of the ctl_table
1911 * struct enable minimal validation of the values being written to be
1912 * performed, and the mode field allows minimal authentication.
1913 *
1914 * More sophisticated management can be enabled by the provision of a
1915 * strategy routine with the table entry. This will be called before
1916 * any automatic read or write of the data is performed.
1917 *
1918 * The strategy routine may return
1919 *
1920 * < 0 - Error occurred (error is passed to user process)
1921 *
1922 * 0 - OK - proceed with automatic read or write.
1923 *
1924 * > 0 - OK - read or write has been done by the strategy routine, so
1925 * return immediately.
1926 *
1927 * There must be a proc_handler routine for any terminal nodes
1928 * mirrored under /proc/sys (non-terminals are handled by a built-in
1929 * directory handler). Several default handlers are available to
1930 * cover common cases -
1931 *
1932 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1933 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1934 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1935 *
1936 * It is the handler's job to read the input buffer from user memory
1937 * and process it. The handler should return 0 on success.
1938 *
1939 * This routine returns %NULL on a failure to register, and a pointer
1940 * to the table header on success.
1941 */
e51b6ba0
EB		 1942struct ctl_table_header *__register_sysctl_paths(
1943 struct ctl_table_root *root,
1944 struct nsproxy *namespaces,
1945 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1946{
29e796fd
EB		 1947 struct ctl_table_header *header;
1948 struct ctl_table *new, **prevp;
1949 unsigned int n, npath;
ae7edecc 1950 struct ctl_table_set *set;
29e796fd
EB		 1951
1952 /* Count the path components */
1953 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1954 ;
1955
1956 /*
1957 * For each path component, allocate a 2-element ctl_table array.
1958 * The first array element will be filled with the sysctl entry
1959 * for this, the second will be the sentinel (ctl_name == 0).
1960 *
1961 * We allocate everything in one go so that we don't have to
1962 * worry about freeing additional memory in unregister_sysctl_table.
1963 */
1964 header = kzalloc(sizeof(struct ctl_table_header) +
1965 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1966 if (!header)
1da177e4 1967 return NULL;
29e796fd
EB		 1968
1969 new = (struct ctl_table *) (header + 1);
1970
1971 /* Now connect the dots */
1972 prevp = &header->ctl_table;
1973 for (n = 0; n < npath; ++n, ++path) {
1974 /* Copy the procname */
1975 new->procname = path->procname;
1976 new->ctl_name = path->ctl_name;
1977 new->mode = 0555;
1978
1979 *prevp = new;
1980 prevp = &new->child;
1981
1982 new += 2;
1983 }
1984 *prevp = table;
23eb06de 1985 header->ctl_table_arg = table;
29e796fd
EB		 1986
1987 INIT_LIST_HEAD(&header->ctl_entry);
1988 header->used = 0;
1989 header->unregistering = NULL;
e51b6ba0 1990 header->root = root;
29e796fd 1991 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1992 header->count = 1;
88f458e4 1993#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1994 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1995 kfree(header);
fc6cd25b
EB		 1996 return NULL;
1997 }
88f458e4 1998#endif
330d57fb 1999 spin_lock(&sysctl_lock);
73455092 2000 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 2001 header->attached_by = header->ctl_table;
2002 header->attached_to = root_table;
2003 header->parent = &root_table_header;
2004 for (set = header->set; set; set = set->parent) {
2005 struct ctl_table_header *p;
2006 list_for_each_entry(p, &set->list, ctl_entry) {
2007 if (p->unregistering)
2008 continue;
2009 try_attach(p, header);
2010 }
2011 }
2012 header->parent->count++;
73455092 2013 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 2014 spin_unlock(&sysctl_lock);
29e796fd
EB		 2015
2016 return header;
2017}
2018
e51b6ba0
EB		 2019/**
2020 * register_sysctl_table_path - register a sysctl table hierarchy
2021 * @path: The path to the directory the sysctl table is in.
2022 * @table: the top-level table structure
2023 *
2024 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2025 * array. A completely 0 filled entry terminates the table.
2026 *
2027 * See __register_sysctl_paths for more details.
2028 */
2029struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2030 struct ctl_table *table)
2031{
2032 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2033 path, table);
2034}
2035
29e796fd
EB		 2036/**
2037 * register_sysctl_table - register a sysctl table hierarchy
2038 * @table: the top-level table structure
2039 *
2040 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2041 * array. A completely 0 filled entry terminates the table.
2042 *
2043 * See register_sysctl_paths for more details.
2044 */
2045struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2046{
2047 static const struct ctl_path null_path[] = { {} };
2048
2049 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2050}
2051
2052/**
2053 * unregister_sysctl_table - unregister a sysctl table hierarchy
2054 * @header: the header returned from register_sysctl_table
2055 *
2056 * Unregisters the sysctl table and all children. proc entries may not
2057 * actually be removed until they are no longer used by anyone.
2058 */
2059void unregister_sysctl_table(struct ctl_table_header * header)
2060{
330d57fb 2061 might_sleep();
f1dad166
PE		 2062
2063 if (header == NULL)
2064 return;
2065
330d57fb
AV		 2066 spin_lock(&sysctl_lock);
2067 start_unregistering(header);
ae7edecc
AV		 2068 if (!--header->parent->count) {
2069 WARN_ON(1);
2070 kfree(header->parent);
2071 }
f7e6ced4
AV		 2072 if (!--header->count)
2073 kfree(header);
330d57fb 2074 spin_unlock(&sysctl_lock);
1da177e4
LT		 2075}
2076
9043476f
AV		 2077int sysctl_is_seen(struct ctl_table_header *p)
2078{
2079 struct ctl_table_set *set = p->set;
2080 int res;
2081 spin_lock(&sysctl_lock);
2082 if (p->unregistering)
2083 res = 0;
2084 else if (!set->is_seen)
2085 res = 1;
2086 else
2087 res = set->is_seen(set);
2088 spin_unlock(&sysctl_lock);
2089 return res;
2090}
2091
73455092
AV		 2092void setup_sysctl_set(struct ctl_table_set *p,
2093 struct ctl_table_set *parent,
2094 int (*is_seen)(struct ctl_table_set *))
2095{
2096 INIT_LIST_HEAD(&p->list);
2097 p->parent = parent ? parent : &sysctl_table_root.default_set;
2098 p->is_seen = is_seen;
2099}
2100
b89a8171 2101#else /* !CONFIG_SYSCTL */
d8217f07 2102struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2103{
2104 return NULL;
2105}
2106
29e796fd
EB		 2107struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2108 struct ctl_table *table)
2109{
2110 return NULL;
2111}
2112
b89a8171
EB		 2113void unregister_sysctl_table(struct ctl_table_header * table)
2114{
2115}
2116
73455092
AV		 2117void setup_sysctl_set(struct ctl_table_set *p,
2118 struct ctl_table_set *parent,
2119 int (*is_seen)(struct ctl_table_set *))
2120{
2121}
2122
f7e6ced4
AV		 2123void sysctl_head_put(struct ctl_table_header *head)
2124{
2125}
2126
b89a8171
EB		 2127#endif /* CONFIG_SYSCTL */
2128
1da177e4
LT		 2129/*
2130 * /proc/sys support
2131 */
2132
b89a8171 2133#ifdef CONFIG_PROC_SYSCTL
1da177e4 2134
b1ba4ddd
AB		 2135static int _proc_do_string(void* data, int maxlen, int write,
2136 struct file *filp, void __user *buffer,
2137 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2138{
2139 size_t len;
2140 char __user *p;
2141 char c;
8d060877
ON		 2142
2143 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2144 *lenp = 0;
2145 return 0;
2146 }
8d060877 2147
1da177e4
LT		 2148 if (write) {
2149 len = 0;
2150 p = buffer;
2151 while (len < *lenp) {
2152 if (get_user(c, p++))
2153 return -EFAULT;
2154 if (c == 0 || c == '\n')
2155 break;
2156 len++;
2157 }
f5dd3d6f
SV		 2158 if (len >= maxlen)
2159 len = maxlen-1;
2160 if(copy_from_user(data, buffer, len))
1da177e4 2161 return -EFAULT;
f5dd3d6f 2162 ((char *) data)[len] = 0;
1da177e4
LT		 2163 *ppos += *lenp;
2164 } else {
f5dd3d6f
SV		 2165 len = strlen(data);
2166 if (len > maxlen)
2167 len = maxlen;
8d060877
ON		 2168
2169 if (*ppos > len) {
2170 *lenp = 0;
2171 return 0;
2172 }
2173
2174 data += *ppos;
2175 len -= *ppos;
2176
1da177e4
LT		 2177 if (len > *lenp)
2178 len = *lenp;
2179 if (len)
f5dd3d6f 2180 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2181 return -EFAULT;
2182 if (len < *lenp) {
2183 if(put_user('\n', ((char __user *) buffer) + len))
2184 return -EFAULT;
2185 len++;
2186 }
2187 *lenp = len;
2188 *ppos += len;
2189 }
2190 return 0;
2191}
2192
f5dd3d6f
SV		 2193/**
2194 * proc_dostring - read a string sysctl
2195 * @table: the sysctl table
2196 * @write: %TRUE if this is a write to the sysctl file
2197 * @filp: the file structure
2198 * @buffer: the user buffer
2199 * @lenp: the size of the user buffer
2200 * @ppos: file position
2201 *
2202 * Reads/writes a string from/to the user buffer. If the kernel
2203 * buffer provided is not large enough to hold the string, the
2204 * string is truncated. The copied string is %NULL-terminated.
2205 * If the string is being read by the user process, it is copied
2206 * and a newline '\n' is added. It is truncated if the buffer is
2207 * not large enough.
2208 *
2209 * Returns 0 on success.
2210 */
d8217f07 2211int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2212 void __user *buffer, size_t *lenp, loff_t *ppos)
2213{
2214 return _proc_do_string(table->data, table->maxlen, write, filp,
2215 buffer, lenp, ppos);
2216}
2217
1da177e4
LT		 2218
2219static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2220 int *valp,
2221 int write, void *data)
2222{
2223 if (write) {
2224 *valp = *negp ? -*lvalp : *lvalp;
2225 } else {
2226 int val = *valp;
2227 if (val < 0) {
2228 *negp = -1;
2229 *lvalp = (unsigned long)-val;
2230 } else {
2231 *negp = 0;
2232 *lvalp = (unsigned long)val;
2233 }
2234 }
2235 return 0;
2236}
2237
d8217f07 2238static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2239 int write, struct file *filp, void __user *buffer,
2240 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2241 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2242 int write, void *data),
2243 void *data)
2244{
2245#define TMPBUFLEN 21
2246 int *i, vleft, first=1, neg, val;
2247 unsigned long lval;
2248 size_t left, len;
2249
2250 char buf[TMPBUFLEN], *p;
2251 char __user *s = buffer;
2252
fcfbd547 2253 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2254 (*ppos && !write)) {
2255 *lenp = 0;
2256 return 0;
2257 }
2258
fcfbd547 2259 i = (int *) tbl_data;
1da177e4
LT		 2260 vleft = table->maxlen / sizeof(*i);
2261 left = *lenp;
2262
2263 if (!conv)
2264 conv = do_proc_dointvec_conv;
2265
2266 for (; left && vleft--; i++, first=0) {
2267 if (write) {
2268 while (left) {
2269 char c;
2270 if (get_user(c, s))
2271 return -EFAULT;
2272 if (!isspace(c))
2273 break;
2274 left--;
2275 s++;
2276 }
2277 if (!left)
2278 break;
2279 neg = 0;
2280 len = left;
2281 if (len > sizeof(buf) - 1)
2282 len = sizeof(buf) - 1;
2283 if (copy_from_user(buf, s, len))
2284 return -EFAULT;
2285 buf[len] = 0;
2286 p = buf;
2287 if (*p == '-' && left > 1) {
2288 neg = 1;
bd9b0bac 2289 p++;
1da177e4
LT		 2290 }
2291 if (*p < '0' || *p > '9')
2292 break;
2293
2294 lval = simple_strtoul(p, &p, 0);
2295
2296 len = p-buf;
2297 if ((len < left) && *p && !isspace(*p))
2298 break;
2299 if (neg)
2300 val = -val;
2301 s += len;
2302 left -= len;
2303
2304 if (conv(&neg, &lval, i, 1, data))
2305 break;
2306 } else {
2307 p = buf;
2308 if (!first)
2309 *p++ = '\t';
2310
2311 if (conv(&neg, &lval, i, 0, data))
2312 break;
2313
2314 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2315 len = strlen(buf);
2316 if (len > left)
2317 len = left;
2318 if(copy_to_user(s, buf, len))
2319 return -EFAULT;
2320 left -= len;
2321 s += len;
2322 }
2323 }
2324
2325 if (!write && !first && left) {
2326 if(put_user('\n', s))
2327 return -EFAULT;
2328 left--, s++;
2329 }
2330 if (write) {
2331 while (left) {
2332 char c;
2333 if (get_user(c, s++))
2334 return -EFAULT;
2335 if (!isspace(c))
2336 break;
2337 left--;
2338 }
2339 }
2340 if (write && first)
2341 return -EINVAL;
2342 *lenp -= left;
2343 *ppos += *lenp;
2344 return 0;
2345#undef TMPBUFLEN
2346}
2347
d8217f07 2348static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2349 void __user *buffer, size_t *lenp, loff_t *ppos,
2350 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2351 int write, void *data),
2352 void *data)
2353{
2354 return __do_proc_dointvec(table->data, table, write, filp,
2355 buffer, lenp, ppos, conv, data);
2356}
2357
1da177e4
LT		 2358/**
2359 * proc_dointvec - read a vector of integers
2360 * @table: the sysctl table
2361 * @write: %TRUE if this is a write to the sysctl file
2362 * @filp: the file structure
2363 * @buffer: the user buffer
2364 * @lenp: the size of the user buffer
2365 * @ppos: file position
2366 *
2367 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2368 * values from/to the user buffer, treated as an ASCII string.
2369 *
2370 * Returns 0 on success.
2371 */
d8217f07 2372int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2373 void __user *buffer, size_t *lenp, loff_t *ppos)
2374{
2375 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2376 NULL,NULL);
2377}
2378
34f5a398 2379/*
25ddbb18
AK		 2380 * Taint values can only be increased
2381 * This means we can safely use a temporary.
34f5a398 2382 */
25ddbb18 2383static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2384 void __user *buffer, size_t *lenp, loff_t *ppos)
2385{
25ddbb18
AK		 2386 struct ctl_table t;
2387 unsigned long tmptaint = get_taint();
2388 int err;
34f5a398 2389
91fcd412 2390 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2391 return -EPERM;
2392
25ddbb18
AK		 2393 t = *table;
2394 t.data = &tmptaint;
2395 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2396 if (err < 0)
2397 return err;
2398
2399 if (write) {
2400 /*
2401 * Poor man's atomic or. Not worth adding a primitive
2402 * to everyone's atomic.h for this
2403 */
2404 int i;
2405 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2406 if ((tmptaint >> i) & 1)
2407 add_taint(i);
2408 }
2409 }
2410
2411 return err;
34f5a398
TT		 2412}
2413
1da177e4
LT		 2414struct do_proc_dointvec_minmax_conv_param {
2415 int *min;
2416 int *max;
2417};
2418
2419static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2420 int *valp,
2421 int write, void *data)
2422{
2423 struct do_proc_dointvec_minmax_conv_param *param = data;
2424 if (write) {
2425 int val = *negp ? -*lvalp : *lvalp;
2426 if ((param->min && *param->min > val) ||
2427 (param->max && *param->max < val))
2428 return -EINVAL;
2429 *valp = val;
2430 } else {
2431 int val = *valp;
2432 if (val < 0) {
2433 *negp = -1;
2434 *lvalp = (unsigned long)-val;
2435 } else {
2436 *negp = 0;
2437 *lvalp = (unsigned long)val;
2438 }
2439 }
2440 return 0;
2441}
2442
2443/**
2444 * proc_dointvec_minmax - read a vector of integers with min/max values
2445 * @table: the sysctl table
2446 * @write: %TRUE if this is a write to the sysctl file
2447 * @filp: the file structure
2448 * @buffer: the user buffer
2449 * @lenp: the size of the user buffer
2450 * @ppos: file position
2451 *
2452 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2453 * values from/to the user buffer, treated as an ASCII string.
2454 *
2455 * This routine will ensure the values are within the range specified by
2456 * table->extra1 (min) and table->extra2 (max).
2457 *
2458 * Returns 0 on success.
2459 */
d8217f07 2460int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2461 void __user *buffer, size_t *lenp, loff_t *ppos)
2462{
2463 struct do_proc_dointvec_minmax_conv_param param = {
2464 .min = (int *) table->extra1,
2465 .max = (int *) table->extra2,
2466 };
2467 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2468 do_proc_dointvec_minmax_conv, &param);
2469}
2470
d8217f07 2471static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2472 struct file *filp,
2473 void __user *buffer,
2474 size_t *lenp, loff_t *ppos,
2475 unsigned long convmul,
2476 unsigned long convdiv)
2477{
2478#define TMPBUFLEN 21
2479 unsigned long *i, *min, *max, val;
2480 int vleft, first=1, neg;
2481 size_t len, left;
2482 char buf[TMPBUFLEN], *p;
2483 char __user *s = buffer;
2484
fcfbd547 2485 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2486 (*ppos && !write)) {
2487 *lenp = 0;
2488 return 0;
2489 }
2490
fcfbd547 2491 i = (unsigned long *) data;
1da177e4
LT		 2492 min = (unsigned long *) table->extra1;
2493 max = (unsigned long *) table->extra2;
2494 vleft = table->maxlen / sizeof(unsigned long);
2495 left = *lenp;
2496
2497 for (; left && vleft--; i++, min++, max++, first=0) {
2498 if (write) {
2499 while (left) {
2500 char c;
2501 if (get_user(c, s))
2502 return -EFAULT;
2503 if (!isspace(c))
2504 break;
2505 left--;
2506 s++;
2507 }
2508 if (!left)
2509 break;
2510 neg = 0;
2511 len = left;
2512 if (len > TMPBUFLEN-1)
2513 len = TMPBUFLEN-1;
2514 if (copy_from_user(buf, s, len))
2515 return -EFAULT;
2516 buf[len] = 0;
2517 p = buf;
2518 if (*p == '-' && left > 1) {
2519 neg = 1;
bd9b0bac 2520 p++;
1da177e4
LT		 2521 }
2522 if (*p < '0' || *p > '9')
2523 break;
2524 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2525 len = p-buf;
2526 if ((len < left) && *p && !isspace(*p))
2527 break;
2528 if (neg)
2529 val = -val;
2530 s += len;
2531 left -= len;
2532
2533 if(neg)
2534 continue;
2535 if ((min && val < *min) || (max && val > *max))
2536 continue;
2537 *i = val;
2538 } else {
2539 p = buf;
2540 if (!first)
2541 *p++ = '\t';
2542 sprintf(p, "%lu", convdiv * (*i) / convmul);
2543 len = strlen(buf);
2544 if (len > left)
2545 len = left;
2546 if(copy_to_user(s, buf, len))
2547 return -EFAULT;
2548 left -= len;
2549 s += len;
2550 }
2551 }
2552
2553 if (!write && !first && left) {
2554 if(put_user('\n', s))
2555 return -EFAULT;
2556 left--, s++;
2557 }
2558 if (write) {
2559 while (left) {
2560 char c;
2561 if (get_user(c, s++))
2562 return -EFAULT;
2563 if (!isspace(c))
2564 break;
2565 left--;
2566 }
2567 }
2568 if (write && first)
2569 return -EINVAL;
2570 *lenp -= left;
2571 *ppos += *lenp;
2572 return 0;
2573#undef TMPBUFLEN
2574}
2575
d8217f07 2576static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2577 struct file *filp,
2578 void __user *buffer,
2579 size_t *lenp, loff_t *ppos,
2580 unsigned long convmul,
2581 unsigned long convdiv)
2582{
2583 return __do_proc_doulongvec_minmax(table->data, table, write,
2584 filp, buffer, lenp, ppos, convmul, convdiv);
2585}
2586
1da177e4
LT		 2587/**
2588 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2589 * @table: the sysctl table
2590 * @write: %TRUE if this is a write to the sysctl file
2591 * @filp: the file structure
2592 * @buffer: the user buffer
2593 * @lenp: the size of the user buffer
2594 * @ppos: file position
2595 *
2596 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2597 * values from/to the user buffer, treated as an ASCII string.
2598 *
2599 * This routine will ensure the values are within the range specified by
2600 * table->extra1 (min) and table->extra2 (max).
2601 *
2602 * Returns 0 on success.
2603 */
d8217f07 2604int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2605 void __user *buffer, size_t *lenp, loff_t *ppos)
2606{
2607 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2608}
2609
2610/**
2611 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2612 * @table: the sysctl table
2613 * @write: %TRUE if this is a write to the sysctl file
2614 * @filp: the file structure
2615 * @buffer: the user buffer
2616 * @lenp: the size of the user buffer
2617 * @ppos: file position
2618 *
2619 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2620 * values from/to the user buffer, treated as an ASCII string. The values
2621 * are treated as milliseconds, and converted to jiffies when they are stored.
2622 *
2623 * This routine will ensure the values are within the range specified by
2624 * table->extra1 (min) and table->extra2 (max).
2625 *
2626 * Returns 0 on success.
2627 */
d8217f07 2628int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2629 struct file *filp,
2630 void __user *buffer,
2631 size_t *lenp, loff_t *ppos)
2632{
2633 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2634 lenp, ppos, HZ, 1000l);
2635}
2636
2637
2638static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2639 int *valp,
2640 int write, void *data)
2641{
2642 if (write) {
cba9f33d
BS		 2643 if (*lvalp > LONG_MAX / HZ)
2644 return 1;
1da177e4
LT		 2645 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2646 } else {
2647 int val = *valp;
2648 unsigned long lval;
2649 if (val < 0) {
2650 *negp = -1;
2651 lval = (unsigned long)-val;
2652 } else {
2653 *negp = 0;
2654 lval = (unsigned long)val;
2655 }
2656 *lvalp = lval / HZ;
2657 }
2658 return 0;
2659}
2660
2661static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2662 int *valp,
2663 int write, void *data)
2664{
2665 if (write) {
cba9f33d
BS		 2666 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2667 return 1;
1da177e4
LT		 2668 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2669 } else {
2670 int val = *valp;
2671 unsigned long lval;
2672 if (val < 0) {
2673 *negp = -1;
2674 lval = (unsigned long)-val;
2675 } else {
2676 *negp = 0;
2677 lval = (unsigned long)val;
2678 }
2679 *lvalp = jiffies_to_clock_t(lval);
2680 }
2681 return 0;
2682}
2683
2684static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2685 int *valp,
2686 int write, void *data)
2687{
2688 if (write) {
2689 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2690 } else {
2691 int val = *valp;
2692 unsigned long lval;
2693 if (val < 0) {
2694 *negp = -1;
2695 lval = (unsigned long)-val;
2696 } else {
2697 *negp = 0;
2698 lval = (unsigned long)val;
2699 }
2700 *lvalp = jiffies_to_msecs(lval);
2701 }
2702 return 0;
2703}
2704
2705/**
2706 * proc_dointvec_jiffies - read a vector of integers as seconds
2707 * @table: the sysctl table
2708 * @write: %TRUE if this is a write to the sysctl file
2709 * @filp: the file structure
2710 * @buffer: the user buffer
2711 * @lenp: the size of the user buffer
2712 * @ppos: file position
2713 *
2714 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2715 * values from/to the user buffer, treated as an ASCII string.
2716 * The values read are assumed to be in seconds, and are converted into
2717 * jiffies.
2718 *
2719 * Returns 0 on success.
2720 */
d8217f07 2721int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2722 void __user *buffer, size_t *lenp, loff_t *ppos)
2723{
2724 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2725 do_proc_dointvec_jiffies_conv,NULL);
2726}
2727
2728/**
2729 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2730 * @table: the sysctl table
2731 * @write: %TRUE if this is a write to the sysctl file
2732 * @filp: the file structure
2733 * @buffer: the user buffer
2734 * @lenp: the size of the user buffer
1e5d5331 2735 * @ppos: pointer to the file position
1da177e4
LT		 2736 *
2737 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2738 * values from/to the user buffer, treated as an ASCII string.
2739 * The values read are assumed to be in 1/USER_HZ seconds, and
2740 * are converted into jiffies.
2741 *
2742 * Returns 0 on success.
2743 */
d8217f07 2744int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2745 void __user *buffer, size_t *lenp, loff_t *ppos)
2746{
2747 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2748 do_proc_dointvec_userhz_jiffies_conv,NULL);
2749}
2750
2751/**
2752 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2753 * @table: the sysctl table
2754 * @write: %TRUE if this is a write to the sysctl file
2755 * @filp: the file structure
2756 * @buffer: the user buffer
2757 * @lenp: the size of the user buffer
67be2dd1
MW		 2758 * @ppos: file position
2759 * @ppos: the current position in the file
1da177e4
LT		 2760 *
2761 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2762 * values from/to the user buffer, treated as an ASCII string.
2763 * The values read are assumed to be in 1/1000 seconds, and
2764 * are converted into jiffies.
2765 *
2766 * Returns 0 on success.
2767 */
d8217f07 2768int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2769 void __user *buffer, size_t *lenp, loff_t *ppos)
2770{
2771 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2772 do_proc_dointvec_ms_jiffies_conv, NULL);
2773}
2774
d8217f07 2775static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2776 void __user *buffer, size_t *lenp, loff_t *ppos)
2777{
2778 struct pid *new_pid;
2779 pid_t tmp;
2780 int r;
2781
6c5f3e7b 2782 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2783
2784 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2785 lenp, ppos, NULL, NULL);
2786 if (r || !write)
2787 return r;
2788
2789 new_pid = find_get_pid(tmp);
2790 if (!new_pid)
2791 return -ESRCH;
2792
2793 put_pid(xchg(&cad_pid, new_pid));
2794 return 0;
2795}
2796
1da177e4
LT		 2797#else /* CONFIG_PROC_FS */
2798
d8217f07 2799int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2800 void __user *buffer, size_t *lenp, loff_t *ppos)
2801{
2802 return -ENOSYS;
2803}
2804
d8217f07 2805int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2806 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2807{
2808 return -ENOSYS;
2809}
2810
d8217f07 2811int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2812 void __user *buffer, size_t *lenp, loff_t *ppos)
2813{
2814 return -ENOSYS;
2815}
2816
d8217f07 2817int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2818 void __user *buffer, size_t *lenp, loff_t *ppos)
2819{
2820 return -ENOSYS;
2821}
2822
d8217f07 2823int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2824 void __user *buffer, size_t *lenp, loff_t *ppos)
2825{
2826 return -ENOSYS;
2827}
2828
d8217f07 2829int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2830 void __user *buffer, size_t *lenp, loff_t *ppos)
2831{
2832 return -ENOSYS;
2833}
2834
d8217f07 2835int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2836 void __user *buffer, size_t *lenp, loff_t *ppos)
2837{
2838 return -ENOSYS;
2839}
2840
d8217f07 2841int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2842 struct file *filp,
2843 void __user *buffer,
2844 size_t *lenp, loff_t *ppos)
2845{
2846 return -ENOSYS;
2847}
2848
2849
2850#endif /* CONFIG_PROC_FS */
2851
2852
b89a8171 2853#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2854/*
2855 * General sysctl support routines
2856 */
2857
49a0c458 2858/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2859int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2860 void __user *oldval, size_t __user *oldlenp,
2861 void __user *newval, size_t newlen)
2862{
2863 size_t len;
2864
2865 /* Get out of I don't have a variable */
2866 if (!table->data || !table->maxlen)
2867 return -ENOTDIR;
2868
2869 if (oldval && oldlenp) {
2870 if (get_user(len, oldlenp))
2871 return -EFAULT;
2872 if (len) {
2873 if (len > table->maxlen)
2874 len = table->maxlen;
2875 if (copy_to_user(oldval, table->data, len))
2876 return -EFAULT;
2877 if (put_user(len, oldlenp))
2878 return -EFAULT;
2879 }
2880 }
2881
2882 if (newval && newlen) {
2883 if (newlen > table->maxlen)
2884 newlen = table->maxlen;
2885
2886 if (copy_from_user(table->data, newval, newlen))
2887 return -EFAULT;
2888 }
2889 return 1;
2890}
2891
1da177e4 2892/* The generic string strategy routine: */
f221e726 2893int sysctl_string(struct ctl_table *table,
1da177e4 2894 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2895 void __user *newval, size_t newlen)
1da177e4 2896{
1da177e4
LT		 2897 if (!table->data || !table->maxlen)
2898 return -ENOTDIR;
2899
2900 if (oldval && oldlenp) {
de9e007d
LT		 2901 size_t bufsize;
2902 if (get_user(bufsize, oldlenp))
1da177e4 2903 return -EFAULT;
de9e007d
LT		 2904 if (bufsize) {
2905 size_t len = strlen(table->data), copied;
2906
2907 /* This shouldn't trigger for a well-formed sysctl */
2908 if (len > table->maxlen)
1da177e4 2909 len = table->maxlen;
de9e007d
LT		 2910
2911 /* Copy up to a max of bufsize-1 bytes of the string */
2912 copied = (len >= bufsize) ? bufsize - 1 : len;
2913
2914 if (copy_to_user(oldval, table->data, copied) ||
2915 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2916 return -EFAULT;
de9e007d 2917 if (put_user(len, oldlenp))
1da177e4
LT		 2918 return -EFAULT;
2919 }
2920 }
2921 if (newval && newlen) {
de9e007d 2922 size_t len = newlen;
1da177e4
LT		 2923 if (len > table->maxlen)
2924 len = table->maxlen;
2925 if(copy_from_user(table->data, newval, len))
2926 return -EFAULT;
2927 if (len == table->maxlen)
2928 len--;
2929 ((char *) table->data)[len] = 0;
2930 }
82c9df82 2931 return 1;
1da177e4
LT		 2932}
2933
2934/*
2935 * This function makes sure that all of the integers in the vector
2936 * are between the minimum and maximum values given in the arrays
2937 * table->extra1 and table->extra2, respectively.
2938 */
f221e726 2939int sysctl_intvec(struct ctl_table *table,
1da177e4 2940 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2941 void __user *newval, size_t newlen)
1da177e4
LT		 2942{
2943
2944 if (newval && newlen) {
2945 int __user *vec = (int __user *) newval;
2946 int *min = (int *) table->extra1;
2947 int *max = (int *) table->extra2;
2948 size_t length;
2949 int i;
2950
2951 if (newlen % sizeof(int) != 0)
2952 return -EINVAL;
2953
2954 if (!table->extra1 && !table->extra2)
2955 return 0;
2956
2957 if (newlen > table->maxlen)
2958 newlen = table->maxlen;
2959 length = newlen / sizeof(int);
2960
2961 for (i = 0; i < length; i++) {
2962 int value;
2963 if (get_user(value, vec + i))
2964 return -EFAULT;
2965 if (min && value < min[i])
2966 return -EINVAL;
2967 if (max && value > max[i])
2968 return -EINVAL;
2969 }
2970 }
2971 return 0;
2972}
2973
2974/* Strategy function to convert jiffies to seconds */
f221e726 2975int sysctl_jiffies(struct ctl_table *table,
1da177e4 2976 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2977 void __user *newval, size_t newlen)
1da177e4 2978{
3ee75ac3 2979 if (oldval && oldlenp) {
1da177e4 2980 size_t olen;
3ee75ac3
AD		 2981
2982 if (get_user(olen, oldlenp))
2983 return -EFAULT;
2984 if (olen) {
2985 int val;
2986
2987 if (olen < sizeof(int))
2988 return -EINVAL;
2989
2990 val = *(int *)(table->data) / HZ;
2991 if (put_user(val, (int __user *)oldval))
2992 return -EFAULT;
2993 if (put_user(sizeof(int), oldlenp))
1da177e4 2994 return -EFAULT;
1da177e4 2995 }
1da177e4
LT		 2996 }
2997 if (newval && newlen) {
2998 int new;
2999 if (newlen != sizeof(int))
3000 return -EINVAL;
3001 if (get_user(new, (int __user *)newval))
3002 return -EFAULT;
3003 *(int *)(table->data) = new*HZ;
3004 }
3005 return 1;
3006}
3007
3008/* Strategy function to convert jiffies to seconds */
f221e726 3009int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3010 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3011 void __user *newval, size_t newlen)
1da177e4 3012{
3ee75ac3 3013 if (oldval && oldlenp) {
1da177e4 3014 size_t olen;
3ee75ac3
AD		 3015
3016 if (get_user(olen, oldlenp))
3017 return -EFAULT;
3018 if (olen) {
3019 int val;
3020
3021 if (olen < sizeof(int))
3022 return -EINVAL;
3023
3024 val = jiffies_to_msecs(*(int *)(table->data));
3025 if (put_user(val, (int __user *)oldval))
3026 return -EFAULT;
3027 if (put_user(sizeof(int), oldlenp))
1da177e4 3028 return -EFAULT;
1da177e4 3029 }
1da177e4
LT		 3030 }
3031 if (newval && newlen) {
3032 int new;
3033 if (newlen != sizeof(int))
3034 return -EINVAL;
3035 if (get_user(new, (int __user *)newval))
3036 return -EFAULT;
3037 *(int *)(table->data) = msecs_to_jiffies(new);
3038 }
3039 return 1;
3040}
3041
c4b8b769 3042
c4b8b769 3043
b89a8171 3044#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3045
3046
1e7bfb21 3047SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3048{
0e009be8 3049 struct __sysctl_args tmp;
7058cb02 3050 int error;
0e009be8 3051
0e009be8
EB		 3052 if (copy_from_user(&tmp, args, sizeof(tmp)))
3053 return -EFAULT;
0e009be8 3054
7058cb02 3055 error = deprecated_sysctl_warning(&tmp);
b89a8171 3056
7058cb02
EB		 3057 /* If no error reading the parameters then just -ENOSYS ... */
3058 if (!error)
3059 error = -ENOSYS;
3060
3061 return error;
1da177e4
LT		 3062}
3063
f221e726 3064int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3065 void __user *oldval, size_t __user *oldlenp,
3066 void __user *newval, size_t newlen)
3067{
3068 return -ENOSYS;
3069}
3070
f221e726 3071int sysctl_string(struct ctl_table *table,
1da177e4 3072 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3073 void __user *newval, size_t newlen)
1da177e4
LT		 3074{
3075 return -ENOSYS;
3076}
3077
f221e726 3078int sysctl_intvec(struct ctl_table *table,
1da177e4 3079 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3080 void __user *newval, size_t newlen)
1da177e4
LT		 3081{
3082 return -ENOSYS;
3083}
3084
f221e726 3085int sysctl_jiffies(struct ctl_table *table,
1da177e4 3086 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3087 void __user *newval, size_t newlen)
1da177e4
LT		 3088{
3089 return -ENOSYS;
3090}
3091
f221e726 3092int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3093 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3094 void __user *newval, size_t newlen)
1da177e4
LT		 3095{
3096 return -ENOSYS;
3097}
3098
b89a8171 3099#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3100
7058cb02
EB		 3101static int deprecated_sysctl_warning(struct __sysctl_args *args)
3102{
3103 static int msg_count;
3104 int name[CTL_MAXNAME];
3105 int i;
3106
6fc48af8
TH		 3107 /* Check args->nlen. */
3108 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3109 return -ENOTDIR;
3110
7058cb02
EB		 3111 /* Read in the sysctl name for better debug message logging */
3112 for (i = 0; i < args->nlen; i++)
3113 if (get_user(name[i], args->name + i))
3114 return -EFAULT;
3115
3116 /* Ignore accesses to kernel.version */
3117 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3118 return 0;
3119
3120 if (msg_count < 5) {
3121 msg_count++;
3122 printk(KERN_INFO
3123 "warning: process `%s' used the deprecated sysctl "
3124 "system call with ", current->comm);
3125 for (i = 0; i < args->nlen; i++)
3126 printk("%d.", name[i]);
3127 printk("\n");
3128 }
3129 return 0;
3130}
3131
1da177e4
LT		 3132/*
3133 * No sense putting this after each symbol definition, twice,
3134 * exception granted :-)
3135 */
3136EXPORT_SYMBOL(proc_dointvec);
3137EXPORT_SYMBOL(proc_dointvec_jiffies);
3138EXPORT_SYMBOL(proc_dointvec_minmax);
3139EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3140EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3141EXPORT_SYMBOL(proc_dostring);
3142EXPORT_SYMBOL(proc_doulongvec_minmax);
3143EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3144EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3145EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3146EXPORT_SYMBOL(sysctl_intvec);
3147EXPORT_SYMBOL(sysctl_jiffies);
3148EXPORT_SYMBOL(sysctl_ms_jiffies);
3149EXPORT_SYMBOL(sysctl_string);
49a0c458 3150EXPORT_SYMBOL(sysctl_data);
1da177e4 3151EXPORT_SYMBOL(unregister_sysctl_table);
Linux kernel - Deliverables
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