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sched: Fix missing sched tunable recalculation on cpu add/remove
[mirror_ubuntu-zesty-kernel.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 28#include <linux/ctype.h>
dfec072e 29#include <linux/kmemcheck.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>
3fff4c42 39#include <linux/ratelimit.h>
1da177e4 40#include <linux/hugetlb.h>
1da177e4 41#include <linux/initrd.h>
0b77f5bf 42#include <linux/key.h>
1da177e4
LT		 43#include <linux/times.h>
44#include <linux/limits.h>
45#include <linux/dcache.h>
46#include <linux/syscalls.h>
c748e134 47#include <linux/vmstat.h>
c255d844
PM		 48#include <linux/nfs_fs.h>
49#include <linux/acpi.h>
10a0a8d4 50#include <linux/reboot.h>
b0fc494f 51#include <linux/ftrace.h>
12e22c5e 52#include <linux/slow-work.h>
cdd6c482 53#include <linux/perf_event.h>
1da177e4
LT		 54
55#include <asm/uaccess.h>
56#include <asm/processor.h>
57
29cbc78b
AK		 58#ifdef CONFIG_X86
59#include <asm/nmi.h>
0741f4d2 60#include <asm/stacktrace.h>
6e7c4025 61#include <asm/io.h>
29cbc78b
AK		 62#endif
63
7058cb02
EB		 64static int deprecated_sysctl_warning(struct __sysctl_args *args);
65
1da177e4
LT		 66#if defined(CONFIG_SYSCTL)
67
68/* External variables not in a header file. */
69extern int C_A_D;
45807a1d 70extern int print_fatal_signals;
1da177e4
LT		 71extern int sysctl_overcommit_memory;
72extern int sysctl_overcommit_ratio;
fadd8fbd 73extern int sysctl_panic_on_oom;
fe071d7e 74extern int sysctl_oom_kill_allocating_task;
fef1bdd6 75extern int sysctl_oom_dump_tasks;
1da177e4 76extern int max_threads;
1da177e4 77extern int core_uses_pid;
d6e71144 78extern int suid_dumpable;
1da177e4 79extern char core_pattern[];
a293980c 80extern unsigned int core_pipe_limit;
1da177e4
LT		 81extern int pid_max;
82extern int min_free_kbytes;
1da177e4 83extern int pid_max_min, pid_max_max;
9d0243bc 84extern int sysctl_drop_caches;
8ad4b1fb 85extern int percpu_pagelist_fraction;
bebfa101 86extern int compat_log;
9745512c 87extern int latencytop_enabled;
eceea0b3 88extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 89#ifndef CONFIG_MMU
90extern int sysctl_nr_trim_pages;
91#endif
31a72bce
PM		 92#ifdef CONFIG_RCU_TORTURE_TEST
93extern int rcutorture_runnable;
94#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
cb684b5b 95#ifdef CONFIG_BLOCK
5e605b64 96extern int blk_iopoll_enabled;
cb684b5b 97#endif
1da177e4 98
c4f3b63f 99/* Constants used for minimum and maximum */
195cf453 100#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 101static int sixty = 60;
9383d967 102static int neg_one = -1;
c4f3b63f
RT		 103#endif
104
c4f3b63f 105static int zero;
cd5f9a4c
LT		 106static int __maybe_unused one = 1;
107static int __maybe_unused two = 2;
fc3501d4 108static unsigned long one_ul = 1;
c4f3b63f 109static int one_hundred = 100;
af91322e
DY		 110#ifdef CONFIG_PRINTK
111static int ten_thousand = 10000;
112#endif
c4f3b63f 113
9e4a5bda
AR		 114/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
115static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
116
1da177e4
LT		 117/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
118static int maxolduid = 65535;
119static int minolduid;
8ad4b1fb 120static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 121
122static int ngroups_max = NGROUPS_MAX;
123
a1ef5adb 124#ifdef CONFIG_MODULES
1da177e4 125extern char modprobe_path[];
3d43321b 126extern int modules_disabled;
1da177e4 127#endif
1da177e4
LT		 128#ifdef CONFIG_CHR_DEV_SG
129extern int sg_big_buff;
130#endif
1da177e4 131
72c57ed5 132#ifdef CONFIG_SPARC
17f04fbb 133#include <asm/system.h>
1da177e4
LT		 134#endif
135
0871420f
DM		 136#ifdef CONFIG_SPARC64
137extern int sysctl_tsb_ratio;
138#endif
139
1da177e4
LT		 140#ifdef __hppa__
141extern int pwrsw_enabled;
142extern int unaligned_enabled;
143#endif
144
347a8dc3 145#ifdef CONFIG_S390
1da177e4
LT		 146#ifdef CONFIG_MATHEMU
147extern int sysctl_ieee_emulation_warnings;
148#endif
149extern int sysctl_userprocess_debug;
951f22d5 150extern int spin_retry;
1da177e4
LT		 151#endif
152
1da177e4
LT		 153#ifdef CONFIG_BSD_PROCESS_ACCT
154extern int acct_parm[];
155#endif
156
d2b176ed
JS		 157#ifdef CONFIG_IA64
158extern int no_unaligned_warning;
88fc241f 159extern int unaligned_dump_stack;
d2b176ed
JS		 160#endif
161
3fff4c42
IM		 162extern struct ratelimit_state printk_ratelimit_state;
163
23f78d4a
IM		 164#ifdef CONFIG_RT_MUTEXES
165extern int max_lock_depth;
166#endif
167
d6f8ff73 168#ifdef CONFIG_PROC_SYSCTL
8d65af78 169static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 170 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 171static int proc_taint(struct ctl_table *table, int write,
34f5a398 172 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 173#endif
9ec52099 174
d8217f07 175static struct ctl_table root_table[];
e51b6ba0
EB		 176static struct ctl_table_root sysctl_table_root;
177static struct ctl_table_header root_table_header = {
b380b0d4 178 .count = 1,
e51b6ba0 179 .ctl_table = root_table,
73455092 180 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 181 .root = &sysctl_table_root,
73455092 182 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 183};
184static struct ctl_table_root sysctl_table_root = {
185 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 186 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 187};
1da177e4 188
d8217f07
EB		 189static struct ctl_table kern_table[];
190static struct ctl_table vm_table[];
191static struct ctl_table fs_table[];
192static struct ctl_table debug_table[];
193static struct ctl_table dev_table[];
194extern struct ctl_table random_table[];
2d9048e2 195#ifdef CONFIG_INOTIFY_USER
d8217f07 196extern struct ctl_table inotify_table[];
0399cb08 197#endif
7ef9964e
DL		 198#ifdef CONFIG_EPOLL
199extern struct ctl_table epoll_table[];
200#endif
1da177e4
LT		 201
202#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
203int sysctl_legacy_va_layout;
204#endif
205
f20786ff
PZ		 206extern int prove_locking;
207extern int lock_stat;
9bc9a6bd 208
1da177e4
LT		 209/* The default sysctl tables: */
210
d8217f07 211static struct ctl_table root_table[] = {
1da177e4
LT		 212 {
213 .ctl_name = CTL_KERN,
214 .procname = "kernel",
215 .mode = 0555,
216 .child = kern_table,
217 },
218 {
219 .ctl_name = CTL_VM,
220 .procname = "vm",
221 .mode = 0555,
222 .child = vm_table,
223 },
1da177e4
LT		 224 {
225 .ctl_name = CTL_FS,
226 .procname = "fs",
227 .mode = 0555,
228 .child = fs_table,
229 },
230 {
231 .ctl_name = CTL_DEBUG,
232 .procname = "debug",
233 .mode = 0555,
234 .child = debug_table,
235 },
236 {
237 .ctl_name = CTL_DEV,
238 .procname = "dev",
239 .mode = 0555,
240 .child = dev_table,
241 },
2be7fe07
AM		 242/*
243 * NOTE: do not add new entries to this table unless you have read
244 * Documentation/sysctl/ctl_unnumbered.txt
245 */
1da177e4
LT		 246 { .ctl_name = 0 }
247};
248
77e54a1f 249#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 250static int min_sched_granularity_ns = 100000; /* 100 usecs */
251static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
252static int min_wakeup_granularity_ns; /* 0 usecs */
253static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 254#endif
255
d8217f07 256static struct ctl_table kern_table[] = {
2bba22c5
MG		 257 {
258 .ctl_name = CTL_UNNUMBERED,
259 .procname = "sched_child_runs_first",
260 .data = &sysctl_sched_child_runs_first,
261 .maxlen = sizeof(unsigned int),
262 .mode = 0644,
263 .proc_handler = &proc_dointvec,
264 },
77e54a1f
IM		 265#ifdef CONFIG_SCHED_DEBUG
266 {
267 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 268 .procname = "sched_min_granularity_ns",
269 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 270 .maxlen = sizeof(unsigned int),
271 .mode = 0644,
b2be5e96
PZ		 272 .proc_handler = &sched_nr_latency_handler,
273 .strategy = &sysctl_intvec,
274 .extra1 = &min_sched_granularity_ns,
275 .extra2 = &max_sched_granularity_ns,
77e54a1f 276 },
21805085
PZ		 277 {
278 .ctl_name = CTL_UNNUMBERED,
279 .procname = "sched_latency_ns",
280 .data = &sysctl_sched_latency,
281 .maxlen = sizeof(unsigned int),
282 .mode = 0644,
b2be5e96 283 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 284 .strategy = &sysctl_intvec,
285 .extra1 = &min_sched_granularity_ns,
286 .extra2 = &max_sched_granularity_ns,
287 },
77e54a1f
IM		 288 {
289 .ctl_name = CTL_UNNUMBERED,
290 .procname = "sched_wakeup_granularity_ns",
291 .data = &sysctl_sched_wakeup_granularity,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = &proc_dointvec_minmax,
295 .strategy = &sysctl_intvec,
77e54a1f
IM		 296 .extra1 = &min_wakeup_granularity_ns,
297 .extra2 = &max_wakeup_granularity_ns,
298 },
2398f2c6
PZ		 299 {
300 .ctl_name = CTL_UNNUMBERED,
301 .procname = "sched_shares_ratelimit",
302 .data = &sysctl_sched_shares_ratelimit,
303 .maxlen = sizeof(unsigned int),
304 .mode = 0644,
305 .proc_handler = &proc_dointvec,
306 },
ffda12a1
PZ		 307 {
308 .ctl_name = CTL_UNNUMBERED,
309 .procname = "sched_shares_thresh",
310 .data = &sysctl_sched_shares_thresh,
311 .maxlen = sizeof(unsigned int),
312 .mode = 0644,
313 .proc_handler = &proc_dointvec_minmax,
314 .strategy = &sysctl_intvec,
315 .extra1 = &zero,
316 },
da84d961
IM		 317 {
318 .ctl_name = CTL_UNNUMBERED,
319 .procname = "sched_migration_cost",
320 .data = &sysctl_sched_migration_cost,
321 .maxlen = sizeof(unsigned int),
322 .mode = 0644,
323 .proc_handler = &proc_dointvec,
324 },
b82d9fdd
PZ		 325 {
326 .ctl_name = CTL_UNNUMBERED,
327 .procname = "sched_nr_migrate",
328 .data = &sysctl_sched_nr_migrate,
329 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 330 .mode = 0644,
331 .proc_handler = &proc_dointvec,
332 },
e9e9250b
PZ		 333 {
334 .ctl_name = CTL_UNNUMBERED,
335 .procname = "sched_time_avg",
336 .data = &sysctl_sched_time_avg,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
339 .proc_handler = &proc_dointvec,
340 },
cd1bb94b
AB		 341 {
342 .ctl_name = CTL_UNNUMBERED,
343 .procname = "timer_migration",
344 .data = &sysctl_timer_migration,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
bfdb4d9f
AB		 347 .proc_handler = &proc_dointvec_minmax,
348 .strategy = &sysctl_intvec,
349 .extra1 = &zero,
350 .extra2 = &one,
fa85ae24 351 },
1fc84aaa 352#endif
9f0c1e56
PZ		 353 {
354 .ctl_name = CTL_UNNUMBERED,
355 .procname = "sched_rt_period_us",
356 .data = &sysctl_sched_rt_period,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
d0b27fa7 359 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 360 },
361 {
362 .ctl_name = CTL_UNNUMBERED,
363 .procname = "sched_rt_runtime_us",
364 .data = &sysctl_sched_rt_runtime,
365 .maxlen = sizeof(int),
366 .mode = 0644,
d0b27fa7 367 .proc_handler = &sched_rt_handler,
9f0c1e56 368 },
1799e35d
IM		 369 {
370 .ctl_name = CTL_UNNUMBERED,
371 .procname = "sched_compat_yield",
372 .data = &sysctl_sched_compat_yield,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = &proc_dointvec,
376 },
f20786ff
PZ		 377#ifdef CONFIG_PROVE_LOCKING
378 {
379 .ctl_name = CTL_UNNUMBERED,
380 .procname = "prove_locking",
381 .data = &prove_locking,
382 .maxlen = sizeof(int),
383 .mode = 0644,
384 .proc_handler = &proc_dointvec,
385 },
386#endif
387#ifdef CONFIG_LOCK_STAT
388 {
389 .ctl_name = CTL_UNNUMBERED,
390 .procname = "lock_stat",
391 .data = &lock_stat,
392 .maxlen = sizeof(int),
393 .mode = 0644,
394 .proc_handler = &proc_dointvec,
395 },
77e54a1f 396#endif
1da177e4
LT		 397 {
398 .ctl_name = KERN_PANIC,
399 .procname = "panic",
400 .data = &panic_timeout,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = &proc_dointvec,
404 },
405 {
406 .ctl_name = KERN_CORE_USES_PID,
407 .procname = "core_uses_pid",
408 .data = &core_uses_pid,
409 .maxlen = sizeof(int),
410 .mode = 0644,
411 .proc_handler = &proc_dointvec,
412 },
413 {
414 .ctl_name = KERN_CORE_PATTERN,
415 .procname = "core_pattern",
416 .data = core_pattern,
71ce92f3 417 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 418 .mode = 0644,
419 .proc_handler = &proc_dostring,
420 .strategy = &sysctl_string,
421 },
a293980c
NH		 422 {
423 .ctl_name = CTL_UNNUMBERED,
424 .procname = "core_pipe_limit",
425 .data = &core_pipe_limit,
426 .maxlen = sizeof(unsigned int),
427 .mode = 0644,
428 .proc_handler = &proc_dointvec,
429 },
34f5a398 430#ifdef CONFIG_PROC_SYSCTL
1da177e4 431 {
1da177e4 432 .procname = "tainted",
25ddbb18 433 .maxlen = sizeof(long),
34f5a398 434 .mode = 0644,
25ddbb18 435 .proc_handler = &proc_taint,
1da177e4 436 },
34f5a398 437#endif
9745512c
AV		 438#ifdef CONFIG_LATENCYTOP
439 {
440 .procname = "latencytop",
441 .data = &latencytop_enabled,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = &proc_dointvec,
445 },
446#endif
1da177e4
LT		 447#ifdef CONFIG_BLK_DEV_INITRD
448 {
449 .ctl_name = KERN_REALROOTDEV,
450 .procname = "real-root-dev",
451 .data = &real_root_dev,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = &proc_dointvec,
455 },
456#endif
45807a1d
IM		 457 {
458 .ctl_name = CTL_UNNUMBERED,
459 .procname = "print-fatal-signals",
460 .data = &print_fatal_signals,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = &proc_dointvec,
464 },
72c57ed5 465#ifdef CONFIG_SPARC
1da177e4
LT		 466 {
467 .ctl_name = KERN_SPARC_REBOOT,
468 .procname = "reboot-cmd",
469 .data = reboot_command,
470 .maxlen = 256,
471 .mode = 0644,
472 .proc_handler = &proc_dostring,
473 .strategy = &sysctl_string,
474 },
475 {
476 .ctl_name = KERN_SPARC_STOP_A,
477 .procname = "stop-a",
478 .data = &stop_a_enabled,
479 .maxlen = sizeof (int),
480 .mode = 0644,
481 .proc_handler = &proc_dointvec,
482 },
483 {
484 .ctl_name = KERN_SPARC_SCONS_PWROFF,
485 .procname = "scons-poweroff",
486 .data = &scons_pwroff,
487 .maxlen = sizeof (int),
488 .mode = 0644,
489 .proc_handler = &proc_dointvec,
490 },
491#endif
0871420f
DM		 492#ifdef CONFIG_SPARC64
493 {
494 .ctl_name = CTL_UNNUMBERED,
495 .procname = "tsb-ratio",
496 .data = &sysctl_tsb_ratio,
497 .maxlen = sizeof (int),
498 .mode = 0644,
499 .proc_handler = &proc_dointvec,
500 },
501#endif
1da177e4
LT		 502#ifdef __hppa__
503 {
504 .ctl_name = KERN_HPPA_PWRSW,
505 .procname = "soft-power",
506 .data = &pwrsw_enabled,
507 .maxlen = sizeof (int),
508 .mode = 0644,
509 .proc_handler = &proc_dointvec,
510 },
511 {
512 .ctl_name = KERN_HPPA_UNALIGNED,
513 .procname = "unaligned-trap",
514 .data = &unaligned_enabled,
515 .maxlen = sizeof (int),
516 .mode = 0644,
517 .proc_handler = &proc_dointvec,
518 },
519#endif
520 {
521 .ctl_name = KERN_CTLALTDEL,
522 .procname = "ctrl-alt-del",
523 .data = &C_A_D,
524 .maxlen = sizeof(int),
525 .mode = 0644,
526 .proc_handler = &proc_dointvec,
527 },
606576ce 528#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 529 {
530 .ctl_name = CTL_UNNUMBERED,
531 .procname = "ftrace_enabled",
532 .data = &ftrace_enabled,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = &ftrace_enable_sysctl,
536 },
537#endif
f38f1d2a
SR		 538#ifdef CONFIG_STACK_TRACER
539 {
540 .ctl_name = CTL_UNNUMBERED,
541 .procname = "stack_tracer_enabled",
542 .data = &stack_tracer_enabled,
543 .maxlen = sizeof(int),
544 .mode = 0644,
545 .proc_handler = &stack_trace_sysctl,
546 },
547#endif
944ac425
SR		 548#ifdef CONFIG_TRACING
549 {
550 .ctl_name = CTL_UNNUMBERED,
3299b4dd 551 .procname = "ftrace_dump_on_oops",
944ac425
SR		 552 .data = &ftrace_dump_on_oops,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = &proc_dointvec,
556 },
557#endif
a1ef5adb 558#ifdef CONFIG_MODULES
1da177e4
LT		 559 {
560 .ctl_name = KERN_MODPROBE,
561 .procname = "modprobe",
562 .data = &modprobe_path,
563 .maxlen = KMOD_PATH_LEN,
564 .mode = 0644,
565 .proc_handler = &proc_dostring,
566 .strategy = &sysctl_string,
567 },
3d43321b
KC		 568 {
569 .ctl_name = CTL_UNNUMBERED,
570 .procname = "modules_disabled",
571 .data = &modules_disabled,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 /* only handle a transition from default "0" to "1" */
575 .proc_handler = &proc_dointvec_minmax,
576 .extra1 = &one,
577 .extra2 = &one,
578 },
1da177e4 579#endif
57ae2508 580#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 581 {
582 .ctl_name = KERN_HOTPLUG,
583 .procname = "hotplug",
312c004d
KS		 584 .data = &uevent_helper,
585 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 586 .mode = 0644,
587 .proc_handler = &proc_dostring,
588 .strategy = &sysctl_string,
589 },
590#endif
591#ifdef CONFIG_CHR_DEV_SG
592 {
593 .ctl_name = KERN_SG_BIG_BUFF,
594 .procname = "sg-big-buff",
595 .data = &sg_big_buff,
596 .maxlen = sizeof (int),
597 .mode = 0444,
598 .proc_handler = &proc_dointvec,
599 },
600#endif
601#ifdef CONFIG_BSD_PROCESS_ACCT
602 {
603 .ctl_name = KERN_ACCT,
604 .procname = "acct",
605 .data = &acct_parm,
606 .maxlen = 3*sizeof(int),
607 .mode = 0644,
608 .proc_handler = &proc_dointvec,
609 },
610#endif
1da177e4
LT		 611#ifdef CONFIG_MAGIC_SYSRQ
612 {
613 .ctl_name = KERN_SYSRQ,
614 .procname = "sysrq",
5d6f647f 615 .data = &__sysrq_enabled,
1da177e4
LT		 616 .maxlen = sizeof (int),
617 .mode = 0644,
618 .proc_handler = &proc_dointvec,
619 },
620#endif
d6f8ff73 621#ifdef CONFIG_PROC_SYSCTL
1da177e4 622 {
1da177e4 623 .procname = "cad_pid",
9ec52099 624 .data = NULL,
1da177e4
LT		 625 .maxlen = sizeof (int),
626 .mode = 0600,
9ec52099 627 .proc_handler = &proc_do_cad_pid,
1da177e4 628 },
d6f8ff73 629#endif
1da177e4
LT		 630 {
631 .ctl_name = KERN_MAX_THREADS,
632 .procname = "threads-max",
633 .data = &max_threads,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = &proc_dointvec,
637 },
638 {
639 .ctl_name = KERN_RANDOM,
640 .procname = "random",
641 .mode = 0555,
642 .child = random_table,
643 },
1da177e4
LT		 644 {
645 .ctl_name = KERN_OVERFLOWUID,
646 .procname = "overflowuid",
647 .data = &overflowuid,
648 .maxlen = sizeof(int),
649 .mode = 0644,
650 .proc_handler = &proc_dointvec_minmax,
651 .strategy = &sysctl_intvec,
652 .extra1 = &minolduid,
653 .extra2 = &maxolduid,
654 },
655 {
656 .ctl_name = KERN_OVERFLOWGID,
657 .procname = "overflowgid",
658 .data = &overflowgid,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = &proc_dointvec_minmax,
662 .strategy = &sysctl_intvec,
663 .extra1 = &minolduid,
664 .extra2 = &maxolduid,
665 },
347a8dc3 666#ifdef CONFIG_S390
1da177e4
LT		 667#ifdef CONFIG_MATHEMU
668 {
669 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
670 .procname = "ieee_emulation_warnings",
671 .data = &sysctl_ieee_emulation_warnings,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = &proc_dointvec,
675 },
1da177e4
LT		 676#endif
677 {
678 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
679 .procname = "userprocess_debug",
680 .data = &sysctl_userprocess_debug,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = &proc_dointvec,
684 },
685#endif
686 {
687 .ctl_name = KERN_PIDMAX,
688 .procname = "pid_max",
689 .data = &pid_max,
690 .maxlen = sizeof (int),
691 .mode = 0644,
692 .proc_handler = &proc_dointvec_minmax,
693 .strategy = sysctl_intvec,
694 .extra1 = &pid_max_min,
695 .extra2 = &pid_max_max,
696 },
697 {
698 .ctl_name = KERN_PANIC_ON_OOPS,
699 .procname = "panic_on_oops",
700 .data = &panic_on_oops,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = &proc_dointvec,
704 },
7ef3d2fd
JP		 705#if defined CONFIG_PRINTK
706 {
707 .ctl_name = KERN_PRINTK,
708 .procname = "printk",
709 .data = &console_loglevel,
710 .maxlen = 4*sizeof(int),
711 .mode = 0644,
712 .proc_handler = &proc_dointvec,
713 },
1da177e4
LT		 714 {
715 .ctl_name = KERN_PRINTK_RATELIMIT,
716 .procname = "printk_ratelimit",
717115e1 717 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 718 .maxlen = sizeof(int),
719 .mode = 0644,
720 .proc_handler = &proc_dointvec_jiffies,
721 .strategy = &sysctl_jiffies,
722 },
723 {
724 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
725 .procname = "printk_ratelimit_burst",
717115e1 726 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 727 .maxlen = sizeof(int),
728 .mode = 0644,
729 .proc_handler = &proc_dointvec,
730 },
af91322e
DY		 731 {
732 .ctl_name = CTL_UNNUMBERED,
733 .procname = "printk_delay",
734 .data = &printk_delay_msec,
735 .maxlen = sizeof(int),
736 .mode = 0644,
737 .proc_handler = &proc_dointvec_minmax,
738 .strategy = &sysctl_intvec,
739 .extra1 = &zero,
740 .extra2 = &ten_thousand,
741 },
7ef3d2fd 742#endif
1da177e4
LT		 743 {
744 .ctl_name = KERN_NGROUPS_MAX,
745 .procname = "ngroups_max",
746 .data = &ngroups_max,
747 .maxlen = sizeof (int),
748 .mode = 0444,
749 .proc_handler = &proc_dointvec,
750 },
751#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
752 {
753 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
754 .procname = "unknown_nmi_panic",
755 .data = &unknown_nmi_panic,
756 .maxlen = sizeof (int),
757 .mode = 0644,
2fbe7b25 758 .proc_handler = &proc_dointvec,
1da177e4 759 },
407984f1 760 {
407984f1
DZ		 761 .procname = "nmi_watchdog",
762 .data = &nmi_watchdog_enabled,
763 .maxlen = sizeof (int),
764 .mode = 0644,
765 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 766 },
767#endif
768#if defined(CONFIG_X86)
8da5adda
DZ		 769 {
770 .ctl_name = KERN_PANIC_ON_NMI,
771 .procname = "panic_on_unrecovered_nmi",
772 .data = &panic_on_unrecovered_nmi,
773 .maxlen = sizeof(int),
774 .mode = 0644,
775 .proc_handler = &proc_dointvec,
776 },
5211a242
KG		 777 {
778 .ctl_name = CTL_UNNUMBERED,
779 .procname = "panic_on_io_nmi",
780 .data = &panic_on_io_nmi,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = &proc_dointvec,
784 },
1da177e4
LT		 785 {
786 .ctl_name = KERN_BOOTLOADER_TYPE,
787 .procname = "bootloader_type",
788 .data = &bootloader_type,
789 .maxlen = sizeof (int),
790 .mode = 0444,
791 .proc_handler = &proc_dointvec,
792 },
5031296c
PA		 793 {
794 .ctl_name = CTL_UNNUMBERED,
795 .procname = "bootloader_version",
796 .data = &bootloader_version,
797 .maxlen = sizeof (int),
798 .mode = 0444,
799 .proc_handler = &proc_dointvec,
800 },
0741f4d2
CE		 801 {
802 .ctl_name = CTL_UNNUMBERED,
803 .procname = "kstack_depth_to_print",
804 .data = &kstack_depth_to_print,
805 .maxlen = sizeof(int),
806 .mode = 0644,
807 .proc_handler = &proc_dointvec,
808 },
6e7c4025
IM		 809 {
810 .ctl_name = CTL_UNNUMBERED,
811 .procname = "io_delay_type",
812 .data = &io_delay_type,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = &proc_dointvec,
816 },
1da177e4 817#endif
7a9166e3 818#if defined(CONFIG_MMU)
1da177e4
LT		 819 {
820 .ctl_name = KERN_RANDOMIZE,
821 .procname = "randomize_va_space",
822 .data = &randomize_va_space,
823 .maxlen = sizeof(int),
824 .mode = 0644,
825 .proc_handler = &proc_dointvec,
826 },
7a9166e3 827#endif
0152fb37 828#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 829 {
830 .ctl_name = KERN_SPIN_RETRY,
831 .procname = "spin_retry",
832 .data = &spin_retry,
833 .maxlen = sizeof (int),
834 .mode = 0644,
835 .proc_handler = &proc_dointvec,
836 },
c255d844 837#endif
673d5b43 838#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 839 {
c255d844 840 .procname = "acpi_video_flags",
77afcf78 841 .data = &acpi_realmode_flags,
c255d844
PM		 842 .maxlen = sizeof (unsigned long),
843 .mode = 0644,
7f99f06f 844 .proc_handler = &proc_doulongvec_minmax,
c255d844 845 },
d2b176ed
JS		 846#endif
847#ifdef CONFIG_IA64
848 {
849 .ctl_name = KERN_IA64_UNALIGNED,
850 .procname = "ignore-unaligned-usertrap",
851 .data = &no_unaligned_warning,
852 .maxlen = sizeof (int),
853 .mode = 0644,
854 .proc_handler = &proc_dointvec,
855 },
88fc241f
DC		 856 {
857 .ctl_name = CTL_UNNUMBERED,
858 .procname = "unaligned-dump-stack",
859 .data = &unaligned_dump_stack,
860 .maxlen = sizeof (int),
861 .mode = 0644,
862 .proc_handler = &proc_dointvec,
863 },
bebfa101 864#endif
c4f3b63f 865#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 866 {
867 .ctl_name = CTL_UNNUMBERED,
868 .procname = "softlockup_panic",
869 .data = &softlockup_panic,
870 .maxlen = sizeof(int),
871 .mode = 0644,
4dca10a9 872 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 873 .strategy = &sysctl_intvec,
874 .extra1 = &zero,
875 .extra2 = &one,
876 },
c4f3b63f
RT		 877 {
878 .ctl_name = CTL_UNNUMBERED,
879 .procname = "softlockup_thresh",
880 .data = &softlockup_thresh,
9383d967 881 .maxlen = sizeof(int),
c4f3b63f 882 .mode = 0644,
baf48f65 883 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 884 .strategy = &sysctl_intvec,
9383d967 885 .extra1 = &neg_one,
c4f3b63f
RT		 886 .extra2 = &sixty,
887 },
e162b39a
MSB		 888#endif
889#ifdef CONFIG_DETECT_HUNG_TASK
890 {
891 .ctl_name = CTL_UNNUMBERED,
892 .procname = "hung_task_panic",
893 .data = &sysctl_hung_task_panic,
894 .maxlen = sizeof(int),
895 .mode = 0644,
896 .proc_handler = &proc_dointvec_minmax,
897 .strategy = &sysctl_intvec,
898 .extra1 = &zero,
899 .extra2 = &one,
900 },
82a1fcb9
IM		 901 {
902 .ctl_name = CTL_UNNUMBERED,
903 .procname = "hung_task_check_count",
904 .data = &sysctl_hung_task_check_count,
90739081 905 .maxlen = sizeof(unsigned long),
82a1fcb9 906 .mode = 0644,
90739081 907 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 908 .strategy = &sysctl_intvec,
909 },
910 {
911 .ctl_name = CTL_UNNUMBERED,
912 .procname = "hung_task_timeout_secs",
913 .data = &sysctl_hung_task_timeout_secs,
90739081 914 .maxlen = sizeof(unsigned long),
82a1fcb9 915 .mode = 0644,
e162b39a 916 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 917 .strategy = &sysctl_intvec,
918 },
919 {
920 .ctl_name = CTL_UNNUMBERED,
921 .procname = "hung_task_warnings",
922 .data = &sysctl_hung_task_warnings,
90739081 923 .maxlen = sizeof(unsigned long),
82a1fcb9 924 .mode = 0644,
90739081 925 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 926 .strategy = &sysctl_intvec,
927 },
c4f3b63f 928#endif
bebfa101
AK		 929#ifdef CONFIG_COMPAT
930 {
931 .ctl_name = KERN_COMPAT_LOG,
932 .procname = "compat-log",
933 .data = &compat_log,
934 .maxlen = sizeof (int),
935 .mode = 0644,
936 .proc_handler = &proc_dointvec,
937 },
951f22d5 938#endif
23f78d4a
IM		 939#ifdef CONFIG_RT_MUTEXES
940 {
941 .ctl_name = KERN_MAX_LOCK_DEPTH,
942 .procname = "max_lock_depth",
943 .data = &max_lock_depth,
944 .maxlen = sizeof(int),
945 .mode = 0644,
946 .proc_handler = &proc_dointvec,
947 },
5096add8 948#endif
10a0a8d4
JF		 949 {
950 .ctl_name = CTL_UNNUMBERED,
951 .procname = "poweroff_cmd",
952 .data = &poweroff_cmd,
953 .maxlen = POWEROFF_CMD_PATH_LEN,
954 .mode = 0644,
955 .proc_handler = &proc_dostring,
956 .strategy = &sysctl_string,
957 },
0b77f5bf
DH		 958#ifdef CONFIG_KEYS
959 {
960 .ctl_name = CTL_UNNUMBERED,
961 .procname = "keys",
962 .mode = 0555,
963 .child = key_sysctls,
964 },
965#endif
31a72bce
PM		 966#ifdef CONFIG_RCU_TORTURE_TEST
967 {
968 .ctl_name = CTL_UNNUMBERED,
969 .procname = "rcutorture_runnable",
970 .data = &rcutorture_runnable,
971 .maxlen = sizeof(int),
972 .mode = 0644,
973 .proc_handler = &proc_dointvec,
974 },
975#endif
12e22c5e
DH		 976#ifdef CONFIG_SLOW_WORK
977 {
978 .ctl_name = CTL_UNNUMBERED,
979 .procname = "slow-work",
980 .mode = 0555,
981 .child = slow_work_sysctls,
982 },
983#endif
cdd6c482 984#ifdef CONFIG_PERF_EVENTS
1ccd1549
PZ		 985 {
986 .ctl_name = CTL_UNNUMBERED,
cdd6c482
IM		 987 .procname = "perf_event_paranoid",
988 .data = &sysctl_perf_event_paranoid,
989 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549
PZ		 990 .mode = 0644,
991 .proc_handler = &proc_dointvec,
992 },
c5078f78
PZ		 993 {
994 .ctl_name = CTL_UNNUMBERED,
cdd6c482
IM		 995 .procname = "perf_event_mlock_kb",
996 .data = &sysctl_perf_event_mlock,
997 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78
PZ		 998 .mode = 0644,
999 .proc_handler = &proc_dointvec,
1000 },
a78ac325
PZ		 1001 {
1002 .ctl_name = CTL_UNNUMBERED,
cdd6c482
IM		 1003 .procname = "perf_event_max_sample_rate",
1004 .data = &sysctl_perf_event_sample_rate,
1005 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325
PZ		 1006 .mode = 0644,
1007 .proc_handler = &proc_dointvec,
1008 },
1ccd1549 1009#endif
dfec072e
VN		 1010#ifdef CONFIG_KMEMCHECK
1011 {
1012 .ctl_name = CTL_UNNUMBERED,
1013 .procname = "kmemcheck",
1014 .data = &kmemcheck_enabled,
1015 .maxlen = sizeof(int),
1016 .mode = 0644,
1017 .proc_handler = &proc_dointvec,
1018 },
1019#endif
cb684b5b 1020#ifdef CONFIG_BLOCK
5e605b64
JA		 1021 {
1022 .ctl_name = CTL_UNNUMBERED,
1023 .procname = "blk_iopoll",
1024 .data = &blk_iopoll_enabled,
1025 .maxlen = sizeof(int),
1026 .mode = 0644,
1027 .proc_handler = &proc_dointvec,
1028 },
cb684b5b 1029#endif
ed2c12f3
AM		 1030/*
1031 * NOTE: do not add new entries to this table unless you have read
1032 * Documentation/sysctl/ctl_unnumbered.txt
1033 */
1da177e4
LT		 1034 { .ctl_name = 0 }
1035};
1036
d8217f07 1037static struct ctl_table vm_table[] = {
1da177e4
LT		 1038 {
1039 .ctl_name = VM_OVERCOMMIT_MEMORY,
1040 .procname = "overcommit_memory",
1041 .data = &sysctl_overcommit_memory,
1042 .maxlen = sizeof(sysctl_overcommit_memory),
1043 .mode = 0644,
1044 .proc_handler = &proc_dointvec,
1045 },
fadd8fbd
KH		 1046 {
1047 .ctl_name = VM_PANIC_ON_OOM,
1048 .procname = "panic_on_oom",
1049 .data = &sysctl_panic_on_oom,
1050 .maxlen = sizeof(sysctl_panic_on_oom),
1051 .mode = 0644,
1052 .proc_handler = &proc_dointvec,
1053 },
fe071d7e
DR		 1054 {
1055 .ctl_name = CTL_UNNUMBERED,
1056 .procname = "oom_kill_allocating_task",
1057 .data = &sysctl_oom_kill_allocating_task,
1058 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1059 .mode = 0644,
1060 .proc_handler = &proc_dointvec,
1061 },
fef1bdd6
DR		 1062 {
1063 .ctl_name = CTL_UNNUMBERED,
1064 .procname = "oom_dump_tasks",
1065 .data = &sysctl_oom_dump_tasks,
1066 .maxlen = sizeof(sysctl_oom_dump_tasks),
1067 .mode = 0644,
1068 .proc_handler = &proc_dointvec,
1069 },
1da177e4
LT		 1070 {
1071 .ctl_name = VM_OVERCOMMIT_RATIO,
1072 .procname = "overcommit_ratio",
1073 .data = &sysctl_overcommit_ratio,
1074 .maxlen = sizeof(sysctl_overcommit_ratio),
1075 .mode = 0644,
1076 .proc_handler = &proc_dointvec,
1077 },
1078 {
1079 .ctl_name = VM_PAGE_CLUSTER,
1080 .procname = "page-cluster",
1081 .data = &page_cluster,
1082 .maxlen = sizeof(int),
1083 .mode = 0644,
1084 .proc_handler = &proc_dointvec,
1085 },
1086 {
1087 .ctl_name = VM_DIRTY_BACKGROUND,
1088 .procname = "dirty_background_ratio",
1089 .data = &dirty_background_ratio,
1090 .maxlen = sizeof(dirty_background_ratio),
1091 .mode = 0644,
2da02997 1092 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 1093 .strategy = &sysctl_intvec,
1094 .extra1 = &zero,
1095 .extra2 = &one_hundred,
1096 },
2da02997
DR		 1097 {
1098 .ctl_name = CTL_UNNUMBERED,
1099 .procname = "dirty_background_bytes",
1100 .data = &dirty_background_bytes,
1101 .maxlen = sizeof(dirty_background_bytes),
1102 .mode = 0644,
1103 .proc_handler = &dirty_background_bytes_handler,
1104 .strategy = &sysctl_intvec,
fc3501d4 1105 .extra1 = &one_ul,
2da02997 1106 },
1da177e4
LT		 1107 {
1108 .ctl_name = VM_DIRTY_RATIO,
1109 .procname = "dirty_ratio",
1110 .data = &vm_dirty_ratio,
1111 .maxlen = sizeof(vm_dirty_ratio),
1112 .mode = 0644,
04fbfdc1 1113 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1114 .strategy = &sysctl_intvec,
1115 .extra1 = &zero,
1116 .extra2 = &one_hundred,
1117 },
2da02997
DR		 1118 {
1119 .ctl_name = CTL_UNNUMBERED,
1120 .procname = "dirty_bytes",
1121 .data = &vm_dirty_bytes,
1122 .maxlen = sizeof(vm_dirty_bytes),
1123 .mode = 0644,
1124 .proc_handler = &dirty_bytes_handler,
1125 .strategy = &sysctl_intvec,
9e4a5bda 1126 .extra1 = &dirty_bytes_min,
2da02997 1127 },
1da177e4 1128 {
1da177e4 1129 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1130 .data = &dirty_writeback_interval,
1131 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1132 .mode = 0644,
1133 .proc_handler = &dirty_writeback_centisecs_handler,
1134 },
1135 {
1da177e4 1136 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1137 .data = &dirty_expire_interval,
1138 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1139 .mode = 0644,
704503d8 1140 .proc_handler = &proc_dointvec,
1da177e4
LT		 1141 },
1142 {
1143 .ctl_name = VM_NR_PDFLUSH_THREADS,
1144 .procname = "nr_pdflush_threads",
1145 .data = &nr_pdflush_threads,
1146 .maxlen = sizeof nr_pdflush_threads,
1147 .mode = 0444 /* read-only*/,
1148 .proc_handler = &proc_dointvec,
1149 },
1150 {
1151 .ctl_name = VM_SWAPPINESS,
1152 .procname = "swappiness",
1153 .data = &vm_swappiness,
1154 .maxlen = sizeof(vm_swappiness),
1155 .mode = 0644,
1156 .proc_handler = &proc_dointvec_minmax,
1157 .strategy = &sysctl_intvec,
1158 .extra1 = &zero,
1159 .extra2 = &one_hundred,
1160 },
1161#ifdef CONFIG_HUGETLB_PAGE
1162 {
1da177e4 1163 .procname = "nr_hugepages",
e5ff2159 1164 .data = NULL,
1da177e4
LT		 1165 .maxlen = sizeof(unsigned long),
1166 .mode = 0644,
1167 .proc_handler = &hugetlb_sysctl_handler,
1168 .extra1 = (void *)&hugetlb_zero,
1169 .extra2 = (void *)&hugetlb_infinity,
1170 },
1171 {
1172 .ctl_name = VM_HUGETLB_GROUP,
1173 .procname = "hugetlb_shm_group",
1174 .data = &sysctl_hugetlb_shm_group,
1175 .maxlen = sizeof(gid_t),
1176 .mode = 0644,
1177 .proc_handler = &proc_dointvec,
1178 },
396faf03
MG		 1179 {
1180 .ctl_name = CTL_UNNUMBERED,
1181 .procname = "hugepages_treat_as_movable",
1182 .data = &hugepages_treat_as_movable,
1183 .maxlen = sizeof(int),
1184 .mode = 0644,
1185 .proc_handler = &hugetlb_treat_movable_handler,
1186 },
d1c3fb1f
NA		 1187 {
1188 .ctl_name = CTL_UNNUMBERED,
1189 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1190 .data = NULL,
1191 .maxlen = sizeof(unsigned long),
d1c3fb1f 1192 .mode = 0644,
a3d0c6aa 1193 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1194 .extra1 = (void *)&hugetlb_zero,
1195 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1196 },
1da177e4
LT		 1197#endif
1198 {
1199 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1200 .procname = "lowmem_reserve_ratio",
1201 .data = &sysctl_lowmem_reserve_ratio,
1202 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1203 .mode = 0644,
1204 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1205 .strategy = &sysctl_intvec,
1206 },
9d0243bc
AM		 1207 {
1208 .ctl_name = VM_DROP_PAGECACHE,
1209 .procname = "drop_caches",
1210 .data = &sysctl_drop_caches,
1211 .maxlen = sizeof(int),
1212 .mode = 0644,
1213 .proc_handler = drop_caches_sysctl_handler,
1214 .strategy = &sysctl_intvec,
1215 },
1da177e4
LT		 1216 {
1217 .ctl_name = VM_MIN_FREE_KBYTES,
1218 .procname = "min_free_kbytes",
1219 .data = &min_free_kbytes,
1220 .maxlen = sizeof(min_free_kbytes),
1221 .mode = 0644,
1222 .proc_handler = &min_free_kbytes_sysctl_handler,
1223 .strategy = &sysctl_intvec,
1224 .extra1 = &zero,
1225 },
8ad4b1fb
RS		 1226 {
1227 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1228 .procname = "percpu_pagelist_fraction",
1229 .data = &percpu_pagelist_fraction,
1230 .maxlen = sizeof(percpu_pagelist_fraction),
1231 .mode = 0644,
1232 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1233 .strategy = &sysctl_intvec,
1234 .extra1 = &min_percpu_pagelist_fract,
1235 },
1da177e4
LT		 1236#ifdef CONFIG_MMU
1237 {
1238 .ctl_name = VM_MAX_MAP_COUNT,
1239 .procname = "max_map_count",
1240 .data = &sysctl_max_map_count,
1241 .maxlen = sizeof(sysctl_max_map_count),
1242 .mode = 0644,
1243 .proc_handler = &proc_dointvec
1244 },
dd8632a1
PM		 1245#else
1246 {
1247 .ctl_name = CTL_UNNUMBERED,
1248 .procname = "nr_trim_pages",
1249 .data = &sysctl_nr_trim_pages,
1250 .maxlen = sizeof(sysctl_nr_trim_pages),
1251 .mode = 0644,
1252 .proc_handler = &proc_dointvec_minmax,
1253 .strategy = &sysctl_intvec,
1254 .extra1 = &zero,
1255 },
1da177e4
LT		 1256#endif
1257 {
1258 .ctl_name = VM_LAPTOP_MODE,
1259 .procname = "laptop_mode",
1260 .data = &laptop_mode,
1261 .maxlen = sizeof(laptop_mode),
1262 .mode = 0644,
ed5b43f1
BS		 1263 .proc_handler = &proc_dointvec_jiffies,
1264 .strategy = &sysctl_jiffies,
1da177e4
LT		 1265 },
1266 {
1267 .ctl_name = VM_BLOCK_DUMP,
1268 .procname = "block_dump",
1269 .data = &block_dump,
1270 .maxlen = sizeof(block_dump),
1271 .mode = 0644,
1272 .proc_handler = &proc_dointvec,
1273 .strategy = &sysctl_intvec,
1274 .extra1 = &zero,
1275 },
1276 {
1277 .ctl_name = VM_VFS_CACHE_PRESSURE,
1278 .procname = "vfs_cache_pressure",
1279 .data = &sysctl_vfs_cache_pressure,
1280 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1281 .mode = 0644,
1282 .proc_handler = &proc_dointvec,
1283 .strategy = &sysctl_intvec,
1284 .extra1 = &zero,
1285 },
1286#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1287 {
1288 .ctl_name = VM_LEGACY_VA_LAYOUT,
1289 .procname = "legacy_va_layout",
1290 .data = &sysctl_legacy_va_layout,
1291 .maxlen = sizeof(sysctl_legacy_va_layout),
1292 .mode = 0644,
1293 .proc_handler = &proc_dointvec,
1294 .strategy = &sysctl_intvec,
1295 .extra1 = &zero,
1296 },
1297#endif
1743660b
CL		 1298#ifdef CONFIG_NUMA
1299 {
1300 .ctl_name = VM_ZONE_RECLAIM_MODE,
1301 .procname = "zone_reclaim_mode",
1302 .data = &zone_reclaim_mode,
1303 .maxlen = sizeof(zone_reclaim_mode),
1304 .mode = 0644,
1305 .proc_handler = &proc_dointvec,
c84db23c
CL		 1306 .strategy = &sysctl_intvec,
1307 .extra1 = &zero,
1743660b 1308 },
9614634f
CL		 1309 {
1310 .ctl_name = VM_MIN_UNMAPPED,
1311 .procname = "min_unmapped_ratio",
1312 .data = &sysctl_min_unmapped_ratio,
1313 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1314 .mode = 0644,
1315 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1316 .strategy = &sysctl_intvec,
1317 .extra1 = &zero,
1318 .extra2 = &one_hundred,
1319 },
0ff38490
CL		 1320 {
1321 .ctl_name = VM_MIN_SLAB,
1322 .procname = "min_slab_ratio",
1323 .data = &sysctl_min_slab_ratio,
1324 .maxlen = sizeof(sysctl_min_slab_ratio),
1325 .mode = 0644,
1326 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1327 .strategy = &sysctl_intvec,
1328 .extra1 = &zero,
1329 .extra2 = &one_hundred,
1330 },
e6e5494c 1331#endif
77461ab3
CL		 1332#ifdef CONFIG_SMP
1333 {
1334 .ctl_name = CTL_UNNUMBERED,
1335 .procname = "stat_interval",
1336 .data = &sysctl_stat_interval,
1337 .maxlen = sizeof(sysctl_stat_interval),
1338 .mode = 0644,
1339 .proc_handler = &proc_dointvec_jiffies,
1340 .strategy = &sysctl_jiffies,
1341 },
1342#endif
ed032189
EP		 1343 {
1344 .ctl_name = CTL_UNNUMBERED,
1345 .procname = "mmap_min_addr",
788084ab
EP		 1346 .data = &dac_mmap_min_addr,
1347 .maxlen = sizeof(unsigned long),
ed032189 1348 .mode = 0644,
788084ab 1349 .proc_handler = &mmap_min_addr_handler,
ed032189 1350 },
f0c0b2b8
KH		 1351#ifdef CONFIG_NUMA
1352 {
1353 .ctl_name = CTL_UNNUMBERED,
1354 .procname = "numa_zonelist_order",
1355 .data = &numa_zonelist_order,
1356 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1357 .mode = 0644,
1358 .proc_handler = &numa_zonelist_order_handler,
1359 .strategy = &sysctl_string,
1360 },
1361#endif
2b8232ce 1362#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1363 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1364 {
1365 .ctl_name = VM_VDSO_ENABLED,
1366 .procname = "vdso_enabled",
1367 .data = &vdso_enabled,
1368 .maxlen = sizeof(vdso_enabled),
1369 .mode = 0644,
1370 .proc_handler = &proc_dointvec,
1371 .strategy = &sysctl_intvec,
1372 .extra1 = &zero,
1373 },
1da177e4 1374#endif
195cf453
BG		 1375#ifdef CONFIG_HIGHMEM
1376 {
1377 .ctl_name = CTL_UNNUMBERED,
1378 .procname = "highmem_is_dirtyable",
1379 .data = &vm_highmem_is_dirtyable,
1380 .maxlen = sizeof(vm_highmem_is_dirtyable),
1381 .mode = 0644,
1382 .proc_handler = &proc_dointvec_minmax,
1383 .strategy = &sysctl_intvec,
1384 .extra1 = &zero,
1385 .extra2 = &one,
1386 },
1387#endif
4be6f6bb
PZ		 1388 {
1389 .ctl_name = CTL_UNNUMBERED,
1390 .procname = "scan_unevictable_pages",
1391 .data = &scan_unevictable_pages,
1392 .maxlen = sizeof(scan_unevictable_pages),
1393 .mode = 0644,
1394 .proc_handler = &scan_unevictable_handler,
1395 },
6a46079c
AK		 1396#ifdef CONFIG_MEMORY_FAILURE
1397 {
1398 .ctl_name = CTL_UNNUMBERED,
1399 .procname = "memory_failure_early_kill",
1400 .data = &sysctl_memory_failure_early_kill,
1401 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1402 .mode = 0644,
1403 .proc_handler = &proc_dointvec_minmax,
1404 .strategy = &sysctl_intvec,
1405 .extra1 = &zero,
1406 .extra2 = &one,
1407 },
1408 {
1409 .ctl_name = CTL_UNNUMBERED,
1410 .procname = "memory_failure_recovery",
1411 .data = &sysctl_memory_failure_recovery,
1412 .maxlen = sizeof(sysctl_memory_failure_recovery),
1413 .mode = 0644,
1414 .proc_handler = &proc_dointvec_minmax,
1415 .strategy = &sysctl_intvec,
1416 .extra1 = &zero,
1417 .extra2 = &one,
1418 },
1419#endif
1420
2be7fe07
AM		 1421/*
1422 * NOTE: do not add new entries to this table unless you have read
1423 * Documentation/sysctl/ctl_unnumbered.txt
1424 */
1da177e4
LT		 1425 { .ctl_name = 0 }
1426};
1427
2abc26fc 1428#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1429static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1430 { .ctl_name = 0 }
1431};
1432#endif
1433
d8217f07 1434static struct ctl_table fs_table[] = {
1da177e4
LT		 1435 {
1436 .ctl_name = FS_NRINODE,
1437 .procname = "inode-nr",
1438 .data = &inodes_stat,
1439 .maxlen = 2*sizeof(int),
1440 .mode = 0444,
1441 .proc_handler = &proc_dointvec,
1442 },
1443 {
1444 .ctl_name = FS_STATINODE,
1445 .procname = "inode-state",
1446 .data = &inodes_stat,
1447 .maxlen = 7*sizeof(int),
1448 .mode = 0444,
1449 .proc_handler = &proc_dointvec,
1450 },
1451 {
1da177e4
LT		 1452 .procname = "file-nr",
1453 .data = &files_stat,
1454 .maxlen = 3*sizeof(int),
1455 .mode = 0444,
529bf6be 1456 .proc_handler = &proc_nr_files,
1da177e4
LT		 1457 },
1458 {
1459 .ctl_name = FS_MAXFILE,
1460 .procname = "file-max",
1461 .data = &files_stat.max_files,
1462 .maxlen = sizeof(int),
1463 .mode = 0644,
1464 .proc_handler = &proc_dointvec,
1465 },
9cfe015a
ED		 1466 {
1467 .ctl_name = CTL_UNNUMBERED,
1468 .procname = "nr_open",
1469 .data = &sysctl_nr_open,
1470 .maxlen = sizeof(int),
1471 .mode = 0644,
eceea0b3
AV		 1472 .proc_handler = &proc_dointvec_minmax,
1473 .extra1 = &sysctl_nr_open_min,
1474 .extra2 = &sysctl_nr_open_max,
9cfe015a 1475 },
1da177e4
LT		 1476 {
1477 .ctl_name = FS_DENTRY,
1478 .procname = "dentry-state",
1479 .data = &dentry_stat,
1480 .maxlen = 6*sizeof(int),
1481 .mode = 0444,
1482 .proc_handler = &proc_dointvec,
1483 },
1484 {
1485 .ctl_name = FS_OVERFLOWUID,
1486 .procname = "overflowuid",
1487 .data = &fs_overflowuid,
1488 .maxlen = sizeof(int),
1489 .mode = 0644,
1490 .proc_handler = &proc_dointvec_minmax,
1491 .strategy = &sysctl_intvec,
1492 .extra1 = &minolduid,
1493 .extra2 = &maxolduid,
1494 },
1495 {
1496 .ctl_name = FS_OVERFLOWGID,
1497 .procname = "overflowgid",
1498 .data = &fs_overflowgid,
1499 .maxlen = sizeof(int),
1500 .mode = 0644,
1501 .proc_handler = &proc_dointvec_minmax,
1502 .strategy = &sysctl_intvec,
1503 .extra1 = &minolduid,
1504 .extra2 = &maxolduid,
1505 },
bfcd17a6 1506#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1507 {
1508 .ctl_name = FS_LEASES,
1509 .procname = "leases-enable",
1510 .data = &leases_enable,
1511 .maxlen = sizeof(int),
1512 .mode = 0644,
1513 .proc_handler = &proc_dointvec,
1514 },
bfcd17a6 1515#endif
1da177e4
LT		 1516#ifdef CONFIG_DNOTIFY
1517 {
1518 .ctl_name = FS_DIR_NOTIFY,
1519 .procname = "dir-notify-enable",
1520 .data = &dir_notify_enable,
1521 .maxlen = sizeof(int),
1522 .mode = 0644,
1523 .proc_handler = &proc_dointvec,
1524 },
1525#endif
1526#ifdef CONFIG_MMU
bfcd17a6 1527#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1528 {
1529 .ctl_name = FS_LEASE_TIME,
1530 .procname = "lease-break-time",
1531 .data = &lease_break_time,
1532 .maxlen = sizeof(int),
1533 .mode = 0644,
8e654fba 1534 .proc_handler = &proc_dointvec,
1da177e4 1535 },
bfcd17a6 1536#endif
ebf3f09c 1537#ifdef CONFIG_AIO
1da177e4 1538 {
1da177e4
LT		 1539 .procname = "aio-nr",
1540 .data = &aio_nr,
1541 .maxlen = sizeof(aio_nr),
1542 .mode = 0444,
d55b5fda 1543 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1544 },
1545 {
1da177e4
LT		 1546 .procname = "aio-max-nr",
1547 .data = &aio_max_nr,
1548 .maxlen = sizeof(aio_max_nr),
1549 .mode = 0644,
d55b5fda 1550 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1551 },
ebf3f09c 1552#endif /* CONFIG_AIO */
2d9048e2 1553#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1554 {
1555 .ctl_name = FS_INOTIFY,
1556 .procname = "inotify",
1557 .mode = 0555,
1558 .child = inotify_table,
1559 },
1560#endif
7ef9964e
DL		 1561#ifdef CONFIG_EPOLL
1562 {
1563 .procname = "epoll",
1564 .mode = 0555,
1565 .child = epoll_table,
1566 },
1567#endif
1da177e4 1568#endif
d6e71144
AC		 1569 {
1570 .ctl_name = KERN_SETUID_DUMPABLE,
1571 .procname = "suid_dumpable",
1572 .data = &suid_dumpable,
1573 .maxlen = sizeof(int),
1574 .mode = 0644,
8e654fba
MW		 1575 .proc_handler = &proc_dointvec_minmax,
1576 .strategy = &sysctl_intvec,
1577 .extra1 = &zero,
1578 .extra2 = &two,
d6e71144 1579 },
2abc26fc
EB		 1580#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1581 {
1582 .ctl_name = CTL_UNNUMBERED,
1583 .procname = "binfmt_misc",
1584 .mode = 0555,
1585 .child = binfmt_misc_table,
1586 },
1587#endif
2be7fe07
AM		 1588/*
1589 * NOTE: do not add new entries to this table unless you have read
1590 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1591 */
1da177e4
LT		 1592 { .ctl_name = 0 }
1593};
1594
d8217f07 1595static struct ctl_table debug_table[] = {
d0c3d534 1596#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1597 {
1598 .ctl_name = CTL_UNNUMBERED,
1599 .procname = "exception-trace",
1600 .data = &show_unhandled_signals,
1601 .maxlen = sizeof(int),
1602 .mode = 0644,
1603 .proc_handler = proc_dointvec
1604 },
1605#endif
1da177e4
LT		 1606 { .ctl_name = 0 }
1607};
1608
d8217f07 1609static struct ctl_table dev_table[] = {
1da177e4 1610 { .ctl_name = 0 }
0eeca283 1611};
1da177e4 1612
330d57fb
AV		 1613static DEFINE_SPINLOCK(sysctl_lock);
1614
1615/* called under sysctl_lock */
1616static int use_table(struct ctl_table_header *p)
1617{
1618 if (unlikely(p->unregistering))
1619 return 0;
1620 p->used++;
1621 return 1;
1622}
1623
1624/* called under sysctl_lock */
1625static void unuse_table(struct ctl_table_header *p)
1626{
1627 if (!--p->used)
1628 if (unlikely(p->unregistering))
1629 complete(p->unregistering);
1630}
1631
1632/* called under sysctl_lock, will reacquire if has to wait */
1633static void start_unregistering(struct ctl_table_header *p)
1634{
1635 /*
1636 * if p->used is 0, nobody will ever touch that entry again;
1637 * we'll eliminate all paths to it before dropping sysctl_lock
1638 */
1639 if (unlikely(p->used)) {
1640 struct completion wait;
1641 init_completion(&wait);
1642 p->unregistering = &wait;
1643 spin_unlock(&sysctl_lock);
1644 wait_for_completion(&wait);
1645 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1646 } else {
1647 /* anything non-NULL; we'll never dereference it */
1648 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1649 }
1650 /*
1651 * do not remove from the list until nobody holds it; walking the
1652 * list in do_sysctl() relies on that.
1653 */
1654 list_del_init(&p->ctl_entry);
1655}
1656
f7e6ced4
AV		 1657void sysctl_head_get(struct ctl_table_header *head)
1658{
1659 spin_lock(&sysctl_lock);
1660 head->count++;
1661 spin_unlock(&sysctl_lock);
1662}
1663
1664void sysctl_head_put(struct ctl_table_header *head)
1665{
1666 spin_lock(&sysctl_lock);
1667 if (!--head->count)
1668 kfree(head);
1669 spin_unlock(&sysctl_lock);
1670}
1671
1672struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1673{
1674 if (!head)
1675 BUG();
1676 spin_lock(&sysctl_lock);
1677 if (!use_table(head))
1678 head = ERR_PTR(-ENOENT);
1679 spin_unlock(&sysctl_lock);
1680 return head;
1681}
1682
805b5d5e
EB		 1683void sysctl_head_finish(struct ctl_table_header *head)
1684{
1685 if (!head)
1686 return;
1687 spin_lock(&sysctl_lock);
1688 unuse_table(head);
1689 spin_unlock(&sysctl_lock);
1690}
1691
73455092
AV		 1692static struct ctl_table_set *
1693lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1694{
1695 struct ctl_table_set *set = &root->default_set;
1696 if (root->lookup)
1697 set = root->lookup(root, namespaces);
1698 return set;
1699}
1700
e51b6ba0
EB		 1701static struct list_head *
1702lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1703{
73455092
AV		 1704 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1705 return &set->list;
e51b6ba0
EB		 1706}
1707
1708struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1709 struct ctl_table_header *prev)
1710{
1711 struct ctl_table_root *root;
1712 struct list_head *header_list;
805b5d5e
EB		 1713 struct ctl_table_header *head;
1714 struct list_head *tmp;
e51b6ba0 1715
805b5d5e
EB		 1716 spin_lock(&sysctl_lock);
1717 if (prev) {
e51b6ba0 1718 head = prev;
805b5d5e
EB		 1719 tmp = &prev->ctl_entry;
1720 unuse_table(prev);
1721 goto next;
1722 }
1723 tmp = &root_table_header.ctl_entry;
1724 for (;;) {
1725 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1726
1727 if (!use_table(head))
1728 goto next;
1729 spin_unlock(&sysctl_lock);
1730 return head;
1731 next:
e51b6ba0 1732 root = head->root;
805b5d5e 1733 tmp = tmp->next;
e51b6ba0
EB		 1734 header_list = lookup_header_list(root, namespaces);
1735 if (tmp != header_list)
1736 continue;
1737
1738 do {
1739 root = list_entry(root->root_list.next,
1740 struct ctl_table_root, root_list);
1741 if (root == &sysctl_table_root)
1742 goto out;
1743 header_list = lookup_header_list(root, namespaces);
1744 } while (list_empty(header_list));
1745 tmp = header_list->next;
805b5d5e 1746 }
e51b6ba0 1747out:
805b5d5e
EB		 1748 spin_unlock(&sysctl_lock);
1749 return NULL;
1750}
1751
e51b6ba0
EB		 1752struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1753{
1754 return __sysctl_head_next(current->nsproxy, prev);
1755}
1756
1757void register_sysctl_root(struct ctl_table_root *root)
1758{
1759 spin_lock(&sysctl_lock);
1760 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1761 spin_unlock(&sysctl_lock);
1762}
1763
b89a8171 1764#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1765/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1766static int do_sysctl_strategy(struct ctl_table_root *root,
1767 struct ctl_table *table,
2c4c7155
PE		 1768 void __user *oldval, size_t __user *oldlenp,
1769 void __user *newval, size_t newlen)
1770{
1771 int op = 0, rc;
1772
1773 if (oldval)
e6305c43 1774 op |= MAY_READ;
2c4c7155 1775 if (newval)
e6305c43 1776 op |= MAY_WRITE;
d7321cd6 1777 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1778 return -EPERM;
1779
1780 if (table->strategy) {
f221e726 1781 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1782 if (rc < 0)
1783 return rc;
1784 if (rc > 0)
1785 return 0;
1786 }
1787
1788 /* If there is no strategy routine, or if the strategy returns
1789 * zero, proceed with automatic r/w */
1790 if (table->data && table->maxlen) {
f221e726 1791 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1792 if (rc < 0)
1793 return rc;
1794 }
1795 return 0;
1796}
1797
1798static int parse_table(int __user *name, int nlen,
1799 void __user *oldval, size_t __user *oldlenp,
1800 void __user *newval, size_t newlen,
d7321cd6 1801 struct ctl_table_root *root,
2c4c7155
PE		 1802 struct ctl_table *table)
1803{
1804 int n;
1805repeat:
1806 if (!nlen)
1807 return -ENOTDIR;
1808 if (get_user(n, name))
1809 return -EFAULT;
1810 for ( ; table->ctl_name || table->procname; table++) {
1811 if (!table->ctl_name)
1812 continue;
1813 if (n == table->ctl_name) {
1814 int error;
1815 if (table->child) {
e6305c43 1816 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1817 return -EPERM;
1818 name++;
1819 nlen--;
1820 table = table->child;
1821 goto repeat;
1822 }
f221e726 1823 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1824 oldval, oldlenp,
1825 newval, newlen);
1826 return error;
1827 }
1828 }
1829 return -ENOTDIR;
1830}
1831
1da177e4
LT		 1832int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1833 void __user *newval, size_t newlen)
1834{
805b5d5e 1835 struct ctl_table_header *head;
330d57fb 1836 int error = -ENOTDIR;
1da177e4
LT		 1837
1838 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1839 return -ENOTDIR;
1840 if (oldval) {
1841 int old_len;
1842 if (!oldlenp || get_user(old_len, oldlenp))
1843 return -EFAULT;
1844 }
330d57fb 1845
805b5d5e
EB		 1846 for (head = sysctl_head_next(NULL); head;
1847 head = sysctl_head_next(head)) {
330d57fb 1848 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1849 newval, newlen,
1850 head->root, head->ctl_table);
805b5d5e
EB		 1851 if (error != -ENOTDIR) {
1852 sysctl_head_finish(head);
330d57fb 1853 break;
805b5d5e
EB		 1854 }
1855 }
330d57fb 1856 return error;
1da177e4
LT		 1857}
1858
1e7bfb21 1859SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1860{
1861 struct __sysctl_args tmp;
1862 int error;
1863
1864 if (copy_from_user(&tmp, args, sizeof(tmp)))
1865 return -EFAULT;
1866
7058cb02
EB		 1867 error = deprecated_sysctl_warning(&tmp);
1868 if (error)
1869 goto out;
1870
1da177e4
LT		 1871 lock_kernel();
1872 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1873 tmp.newval, tmp.newlen);
1874 unlock_kernel();
7058cb02 1875out:
1da177e4
LT		 1876 return error;
1877}
b89a8171 1878#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1879
1880/*
1ff007eb 1881 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1882 * some sysctl variables are readonly even to root.
1883 */
1884
1885static int test_perm(int mode, int op)
1886{
76aac0e9 1887 if (!current_euid())
1da177e4
LT		 1888 mode >>= 6;
1889 else if (in_egroup_p(0))
1890 mode >>= 3;
e6305c43 1891 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1892 return 0;
1893 return -EACCES;
1894}
1895
d7321cd6 1896int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1897{
1898 int error;
d7321cd6
PE		 1899 int mode;
1900
e6305c43 1901 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1902 if (error)
1903 return error;
d7321cd6
PE		 1904
1905 if (root->permissions)
1906 mode = root->permissions(root, current->nsproxy, table);
1907 else
1908 mode = table->mode;
1909
1910 return test_perm(mode, op);
1da177e4
LT		 1911}
1912
d912b0cc
EB		 1913static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1914{
1915 for (; table->ctl_name || table->procname; table++) {
1916 table->parent = parent;
1917 if (table->child)
1918 sysctl_set_parent(table, table->child);
1919 }
1920}
1921
1922static __init int sysctl_init(void)
1923{
1924 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1925#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1926 {
1927 int err;
1928 err = sysctl_check_table(current->nsproxy, root_table);
1929 }
1930#endif
d912b0cc
EB		 1931 return 0;
1932}
1933
1934core_initcall(sysctl_init);
1935
bfbcf034
AV		 1936static struct ctl_table *is_branch_in(struct ctl_table *branch,
1937 struct ctl_table *table)
ae7edecc
AV		 1938{
1939 struct ctl_table *p;
1940 const char *s = branch->procname;
1941
1942 /* branch should have named subdirectory as its first element */
1943 if (!s || !branch->child)
bfbcf034 1944 return NULL;
ae7edecc
AV		 1945
1946 /* ... and nothing else */
1947 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1948 return NULL;
ae7edecc
AV		 1949
1950 /* table should contain subdirectory with the same name */
1951 for (p = table; p->procname || p->ctl_name; p++) {
1952 if (!p->child)
1953 continue;
1954 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1955 return p;
ae7edecc 1956 }
bfbcf034 1957 return NULL;
ae7edecc
AV		 1958}
1959
1960/* see if attaching q to p would be an improvement */
1961static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1962{
1963 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1964 struct ctl_table *next;
ae7edecc
AV		 1965 int is_better = 0;
1966 int not_in_parent = !p->attached_by;
1967
bfbcf034 1968 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1969 if (by == q->attached_by)
1970 is_better = 1;
1971 if (to == p->attached_by)
1972 not_in_parent = 1;
1973 by = by->child;
bfbcf034 1974 to = next->child;
ae7edecc
AV		 1975 }
1976
1977 if (is_better && not_in_parent) {
1978 q->attached_by = by;
1979 q->attached_to = to;
1980 q->parent = p;
1981 }
1982}
1983
1da177e4 1984/**
e51b6ba0
EB		 1985 * __register_sysctl_paths - register a sysctl hierarchy
1986 * @root: List of sysctl headers to register on
1987 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1988 * @path: The path to the directory the sysctl table is in.
1da177e4 1989 * @table: the top-level table structure
1da177e4
LT		 1990 *
1991 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1992 * array. A completely 0 filled entry terminates the table.
1da177e4 1993 *
d8217f07 1994 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1995 *
1996 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1997 * must be unique within that level of sysctl
1998 *
1999 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
2000 * enter a sysctl file
2001 *
2002 * data - a pointer to data for use by proc_handler
2003 *
2004 * maxlen - the maximum size in bytes of the data
2005 *
2006 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
2007 *
2008 * child - a pointer to the child sysctl table if this entry is a directory, or
2009 * %NULL.
2010 *
2011 * proc_handler - the text handler routine (described below)
2012 *
2013 * strategy - the strategy routine (described below)
2014 *
2015 * de - for internal use by the sysctl routines
2016 *
2017 * extra1, extra2 - extra pointers usable by the proc handler routines
2018 *
2019 * Leaf nodes in the sysctl tree will be represented by a single file
2020 * under /proc; non-leaf nodes will be represented by directories.
2021 *
2022 * sysctl(2) can automatically manage read and write requests through
2023 * the sysctl table. The data and maxlen fields of the ctl_table
2024 * struct enable minimal validation of the values being written to be
2025 * performed, and the mode field allows minimal authentication.
2026 *
2027 * More sophisticated management can be enabled by the provision of a
2028 * strategy routine with the table entry. This will be called before
2029 * any automatic read or write of the data is performed.
2030 *
2031 * The strategy routine may return
2032 *
2033 * < 0 - Error occurred (error is passed to user process)
2034 *
2035 * 0 - OK - proceed with automatic read or write.
2036 *
2037 * > 0 - OK - read or write has been done by the strategy routine, so
2038 * return immediately.
2039 *
2040 * There must be a proc_handler routine for any terminal nodes
2041 * mirrored under /proc/sys (non-terminals are handled by a built-in
2042 * directory handler). Several default handlers are available to
2043 * cover common cases -
2044 *
2045 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
2046 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
2047 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
2048 *
2049 * It is the handler's job to read the input buffer from user memory
2050 * and process it. The handler should return 0 on success.
2051 *
2052 * This routine returns %NULL on a failure to register, and a pointer
2053 * to the table header on success.
2054 */
e51b6ba0
EB		 2055struct ctl_table_header *__register_sysctl_paths(
2056 struct ctl_table_root *root,
2057 struct nsproxy *namespaces,
2058 const struct ctl_path *path, struct ctl_table *table)
1da177e4 2059{
29e796fd
EB		 2060 struct ctl_table_header *header;
2061 struct ctl_table *new, **prevp;
2062 unsigned int n, npath;
ae7edecc 2063 struct ctl_table_set *set;
29e796fd
EB		 2064
2065 /* Count the path components */
2066 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2067 ;
2068
2069 /*
2070 * For each path component, allocate a 2-element ctl_table array.
2071 * The first array element will be filled with the sysctl entry
2072 * for this, the second will be the sentinel (ctl_name == 0).
2073 *
2074 * We allocate everything in one go so that we don't have to
2075 * worry about freeing additional memory in unregister_sysctl_table.
2076 */
2077 header = kzalloc(sizeof(struct ctl_table_header) +
2078 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2079 if (!header)
1da177e4 2080 return NULL;
29e796fd
EB		 2081
2082 new = (struct ctl_table *) (header + 1);
2083
2084 /* Now connect the dots */
2085 prevp = &header->ctl_table;
2086 for (n = 0; n < npath; ++n, ++path) {
2087 /* Copy the procname */
2088 new->procname = path->procname;
2089 new->ctl_name = path->ctl_name;
2090 new->mode = 0555;
2091
2092 *prevp = new;
2093 prevp = &new->child;
2094
2095 new += 2;
2096 }
2097 *prevp = table;
23eb06de 2098 header->ctl_table_arg = table;
29e796fd
EB		 2099
2100 INIT_LIST_HEAD(&header->ctl_entry);
2101 header->used = 0;
2102 header->unregistering = NULL;
e51b6ba0 2103 header->root = root;
29e796fd 2104 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 2105 header->count = 1;
88f458e4 2106#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 2107 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 2108 kfree(header);
fc6cd25b
EB		 2109 return NULL;
2110 }
88f458e4 2111#endif
330d57fb 2112 spin_lock(&sysctl_lock);
73455092 2113 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 2114 header->attached_by = header->ctl_table;
2115 header->attached_to = root_table;
2116 header->parent = &root_table_header;
2117 for (set = header->set; set; set = set->parent) {
2118 struct ctl_table_header *p;
2119 list_for_each_entry(p, &set->list, ctl_entry) {
2120 if (p->unregistering)
2121 continue;
2122 try_attach(p, header);
2123 }
2124 }
2125 header->parent->count++;
73455092 2126 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 2127 spin_unlock(&sysctl_lock);
29e796fd
EB		 2128
2129 return header;
2130}
2131
e51b6ba0
EB		 2132/**
2133 * register_sysctl_table_path - register a sysctl table hierarchy
2134 * @path: The path to the directory the sysctl table is in.
2135 * @table: the top-level table structure
2136 *
2137 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2138 * array. A completely 0 filled entry terminates the table.
2139 *
2140 * See __register_sysctl_paths for more details.
2141 */
2142struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2143 struct ctl_table *table)
2144{
2145 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2146 path, table);
2147}
2148
29e796fd
EB		 2149/**
2150 * register_sysctl_table - register a sysctl table hierarchy
2151 * @table: the top-level table structure
2152 *
2153 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2154 * array. A completely 0 filled entry terminates the table.
2155 *
2156 * See register_sysctl_paths for more details.
2157 */
2158struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2159{
2160 static const struct ctl_path null_path[] = { {} };
2161
2162 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2163}
2164
2165/**
2166 * unregister_sysctl_table - unregister a sysctl table hierarchy
2167 * @header: the header returned from register_sysctl_table
2168 *
2169 * Unregisters the sysctl table and all children. proc entries may not
2170 * actually be removed until they are no longer used by anyone.
2171 */
2172void unregister_sysctl_table(struct ctl_table_header * header)
2173{
330d57fb 2174 might_sleep();
f1dad166
PE		 2175
2176 if (header == NULL)
2177 return;
2178
330d57fb
AV		 2179 spin_lock(&sysctl_lock);
2180 start_unregistering(header);
ae7edecc
AV		 2181 if (!--header->parent->count) {
2182 WARN_ON(1);
2183 kfree(header->parent);
2184 }
f7e6ced4
AV		 2185 if (!--header->count)
2186 kfree(header);
330d57fb 2187 spin_unlock(&sysctl_lock);
1da177e4
LT		 2188}
2189
9043476f
AV		 2190int sysctl_is_seen(struct ctl_table_header *p)
2191{
2192 struct ctl_table_set *set = p->set;
2193 int res;
2194 spin_lock(&sysctl_lock);
2195 if (p->unregistering)
2196 res = 0;
2197 else if (!set->is_seen)
2198 res = 1;
2199 else
2200 res = set->is_seen(set);
2201 spin_unlock(&sysctl_lock);
2202 return res;
2203}
2204
73455092
AV		 2205void setup_sysctl_set(struct ctl_table_set *p,
2206 struct ctl_table_set *parent,
2207 int (*is_seen)(struct ctl_table_set *))
2208{
2209 INIT_LIST_HEAD(&p->list);
2210 p->parent = parent ? parent : &sysctl_table_root.default_set;
2211 p->is_seen = is_seen;
2212}
2213
b89a8171 2214#else /* !CONFIG_SYSCTL */
d8217f07 2215struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2216{
2217 return NULL;
2218}
2219
29e796fd
EB		 2220struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2221 struct ctl_table *table)
2222{
2223 return NULL;
2224}
2225
b89a8171
EB		 2226void unregister_sysctl_table(struct ctl_table_header * table)
2227{
2228}
2229
73455092
AV		 2230void setup_sysctl_set(struct ctl_table_set *p,
2231 struct ctl_table_set *parent,
2232 int (*is_seen)(struct ctl_table_set *))
2233{
2234}
2235
f7e6ced4
AV		 2236void sysctl_head_put(struct ctl_table_header *head)
2237{
2238}
2239
b89a8171
EB		 2240#endif /* CONFIG_SYSCTL */
2241
1da177e4
LT		 2242/*
2243 * /proc/sys support
2244 */
2245
b89a8171 2246#ifdef CONFIG_PROC_SYSCTL
1da177e4 2247
b1ba4ddd 2248static int _proc_do_string(void* data, int maxlen, int write,
8d65af78 2249 void __user *buffer,
b1ba4ddd 2250 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2251{
2252 size_t len;
2253 char __user *p;
2254 char c;
8d060877
ON		 2255
2256 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2257 *lenp = 0;
2258 return 0;
2259 }
8d060877 2260
1da177e4
LT		 2261 if (write) {
2262 len = 0;
2263 p = buffer;
2264 while (len < *lenp) {
2265 if (get_user(c, p++))
2266 return -EFAULT;
2267 if (c == 0 || c == '\n')
2268 break;
2269 len++;
2270 }
f5dd3d6f
SV		 2271 if (len >= maxlen)
2272 len = maxlen-1;
2273 if(copy_from_user(data, buffer, len))
1da177e4 2274 return -EFAULT;
f5dd3d6f 2275 ((char *) data)[len] = 0;
1da177e4
LT		 2276 *ppos += *lenp;
2277 } else {
f5dd3d6f
SV		 2278 len = strlen(data);
2279 if (len > maxlen)
2280 len = maxlen;
8d060877
ON		 2281
2282 if (*ppos > len) {
2283 *lenp = 0;
2284 return 0;
2285 }
2286
2287 data += *ppos;
2288 len -= *ppos;
2289
1da177e4
LT		 2290 if (len > *lenp)
2291 len = *lenp;
2292 if (len)
f5dd3d6f 2293 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2294 return -EFAULT;
2295 if (len < *lenp) {
2296 if(put_user('\n', ((char __user *) buffer) + len))
2297 return -EFAULT;
2298 len++;
2299 }
2300 *lenp = len;
2301 *ppos += len;
2302 }
2303 return 0;
2304}
2305
f5dd3d6f
SV		 2306/**
2307 * proc_dostring - read a string sysctl
2308 * @table: the sysctl table
2309 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 2310 * @buffer: the user buffer
2311 * @lenp: the size of the user buffer
2312 * @ppos: file position
2313 *
2314 * Reads/writes a string from/to the user buffer. If the kernel
2315 * buffer provided is not large enough to hold the string, the
2316 * string is truncated. The copied string is %NULL-terminated.
2317 * If the string is being read by the user process, it is copied
2318 * and a newline '\n' is added. It is truncated if the buffer is
2319 * not large enough.
2320 *
2321 * Returns 0 on success.
2322 */
8d65af78 2323int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 2324 void __user *buffer, size_t *lenp, loff_t *ppos)
2325{
8d65af78 2326 return _proc_do_string(table->data, table->maxlen, write,
f5dd3d6f
SV		 2327 buffer, lenp, ppos);
2328}
2329
1da177e4
LT		 2330
2331static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2332 int *valp,
2333 int write, void *data)
2334{
2335 if (write) {
2336 *valp = *negp ? -*lvalp : *lvalp;
2337 } else {
2338 int val = *valp;
2339 if (val < 0) {
2340 *negp = -1;
2341 *lvalp = (unsigned long)-val;
2342 } else {
2343 *negp = 0;
2344 *lvalp = (unsigned long)val;
2345 }
2346 }
2347 return 0;
2348}
2349
d8217f07 2350static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2351 int write, void __user *buffer,
fcfbd547 2352 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2353 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2354 int write, void *data),
2355 void *data)
2356{
2357#define TMPBUFLEN 21
7338f299 2358 int *i, vleft, first = 1, neg;
1da177e4
LT		 2359 unsigned long lval;
2360 size_t left, len;
2361
2362 char buf[TMPBUFLEN], *p;
2363 char __user *s = buffer;
2364
fcfbd547 2365 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2366 (*ppos && !write)) {
2367 *lenp = 0;
2368 return 0;
2369 }
2370
fcfbd547 2371 i = (int *) tbl_data;
1da177e4
LT		 2372 vleft = table->maxlen / sizeof(*i);
2373 left = *lenp;
2374
2375 if (!conv)
2376 conv = do_proc_dointvec_conv;
2377
2378 for (; left && vleft--; i++, first=0) {
2379 if (write) {
2380 while (left) {
2381 char c;
2382 if (get_user(c, s))
2383 return -EFAULT;
2384 if (!isspace(c))
2385 break;
2386 left--;
2387 s++;
2388 }
2389 if (!left)
2390 break;
2391 neg = 0;
2392 len = left;
2393 if (len > sizeof(buf) - 1)
2394 len = sizeof(buf) - 1;
2395 if (copy_from_user(buf, s, len))
2396 return -EFAULT;
2397 buf[len] = 0;
2398 p = buf;
2399 if (*p == '-' && left > 1) {
2400 neg = 1;
bd9b0bac 2401 p++;
1da177e4
LT		 2402 }
2403 if (*p < '0' || *p > '9')
2404 break;
2405
2406 lval = simple_strtoul(p, &p, 0);
2407
2408 len = p-buf;
2409 if ((len < left) && *p && !isspace(*p))
2410 break;
1da177e4
LT		 2411 s += len;
2412 left -= len;
2413
2414 if (conv(&neg, &lval, i, 1, data))
2415 break;
2416 } else {
2417 p = buf;
2418 if (!first)
2419 *p++ = '\t';
2420
2421 if (conv(&neg, &lval, i, 0, data))
2422 break;
2423
2424 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2425 len = strlen(buf);
2426 if (len > left)
2427 len = left;
2428 if(copy_to_user(s, buf, len))
2429 return -EFAULT;
2430 left -= len;
2431 s += len;
2432 }
2433 }
2434
2435 if (!write && !first && left) {
2436 if(put_user('\n', s))
2437 return -EFAULT;
2438 left--, s++;
2439 }
2440 if (write) {
2441 while (left) {
2442 char c;
2443 if (get_user(c, s++))
2444 return -EFAULT;
2445 if (!isspace(c))
2446 break;
2447 left--;
2448 }
2449 }
2450 if (write && first)
2451 return -EINVAL;
2452 *lenp -= left;
2453 *ppos += *lenp;
2454 return 0;
2455#undef TMPBUFLEN
2456}
2457
8d65af78 2458static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547
KK		 2459 void __user *buffer, size_t *lenp, loff_t *ppos,
2460 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2461 int write, void *data),
2462 void *data)
2463{
8d65af78 2464 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2465 buffer, lenp, ppos, conv, data);
2466}
2467
1da177e4
LT		 2468/**
2469 * proc_dointvec - read a vector of integers
2470 * @table: the sysctl table
2471 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2472 * @buffer: the user buffer
2473 * @lenp: the size of the user buffer
2474 * @ppos: file position
2475 *
2476 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2477 * values from/to the user buffer, treated as an ASCII string.
2478 *
2479 * Returns 0 on success.
2480 */
8d65af78 2481int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2482 void __user *buffer, size_t *lenp, loff_t *ppos)
2483{
8d65af78 2484 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2485 NULL,NULL);
2486}
2487
34f5a398 2488/*
25ddbb18
AK		 2489 * Taint values can only be increased
2490 * This means we can safely use a temporary.
34f5a398 2491 */
8d65af78 2492static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2493 void __user *buffer, size_t *lenp, loff_t *ppos)
2494{
25ddbb18
AK		 2495 struct ctl_table t;
2496 unsigned long tmptaint = get_taint();
2497 int err;
34f5a398 2498
91fcd412 2499 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2500 return -EPERM;
2501
25ddbb18
AK		 2502 t = *table;
2503 t.data = &tmptaint;
8d65af78 2504 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2505 if (err < 0)
2506 return err;
2507
2508 if (write) {
2509 /*
2510 * Poor man's atomic or. Not worth adding a primitive
2511 * to everyone's atomic.h for this
2512 */
2513 int i;
2514 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2515 if ((tmptaint >> i) & 1)
2516 add_taint(i);
2517 }
2518 }
2519
2520 return err;
34f5a398
TT		 2521}
2522
1da177e4
LT		 2523struct do_proc_dointvec_minmax_conv_param {
2524 int *min;
2525 int *max;
2526};
2527
2528static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2529 int *valp,
2530 int write, void *data)
2531{
2532 struct do_proc_dointvec_minmax_conv_param *param = data;
2533 if (write) {
2534 int val = *negp ? -*lvalp : *lvalp;
2535 if ((param->min && *param->min > val) ||
2536 (param->max && *param->max < val))
2537 return -EINVAL;
2538 *valp = val;
2539 } else {
2540 int val = *valp;
2541 if (val < 0) {
2542 *negp = -1;
2543 *lvalp = (unsigned long)-val;
2544 } else {
2545 *negp = 0;
2546 *lvalp = (unsigned long)val;
2547 }
2548 }
2549 return 0;
2550}
2551
2552/**
2553 * proc_dointvec_minmax - read a vector of integers with min/max values
2554 * @table: the sysctl table
2555 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2556 * @buffer: the user buffer
2557 * @lenp: the size of the user buffer
2558 * @ppos: file position
2559 *
2560 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2561 * values from/to the user buffer, treated as an ASCII string.
2562 *
2563 * This routine will ensure the values are within the range specified by
2564 * table->extra1 (min) and table->extra2 (max).
2565 *
2566 * Returns 0 on success.
2567 */
8d65af78 2568int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2569 void __user *buffer, size_t *lenp, loff_t *ppos)
2570{
2571 struct do_proc_dointvec_minmax_conv_param param = {
2572 .min = (int *) table->extra1,
2573 .max = (int *) table->extra2,
2574 };
8d65af78 2575 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2576 do_proc_dointvec_minmax_conv, &param);
2577}
2578
d8217f07 2579static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2580 void __user *buffer,
2581 size_t *lenp, loff_t *ppos,
2582 unsigned long convmul,
2583 unsigned long convdiv)
2584{
2585#define TMPBUFLEN 21
2586 unsigned long *i, *min, *max, val;
2587 int vleft, first=1, neg;
2588 size_t len, left;
2589 char buf[TMPBUFLEN], *p;
2590 char __user *s = buffer;
2591
fcfbd547 2592 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2593 (*ppos && !write)) {
2594 *lenp = 0;
2595 return 0;
2596 }
2597
fcfbd547 2598 i = (unsigned long *) data;
1da177e4
LT		 2599 min = (unsigned long *) table->extra1;
2600 max = (unsigned long *) table->extra2;
2601 vleft = table->maxlen / sizeof(unsigned long);
2602 left = *lenp;
2603
2604 for (; left && vleft--; i++, min++, max++, first=0) {
2605 if (write) {
2606 while (left) {
2607 char c;
2608 if (get_user(c, s))
2609 return -EFAULT;
2610 if (!isspace(c))
2611 break;
2612 left--;
2613 s++;
2614 }
2615 if (!left)
2616 break;
2617 neg = 0;
2618 len = left;
2619 if (len > TMPBUFLEN-1)
2620 len = TMPBUFLEN-1;
2621 if (copy_from_user(buf, s, len))
2622 return -EFAULT;
2623 buf[len] = 0;
2624 p = buf;
2625 if (*p == '-' && left > 1) {
2626 neg = 1;
bd9b0bac 2627 p++;
1da177e4
LT		 2628 }
2629 if (*p < '0' || *p > '9')
2630 break;
2631 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2632 len = p-buf;
2633 if ((len < left) && *p && !isspace(*p))
2634 break;
2635 if (neg)
2636 val = -val;
2637 s += len;
2638 left -= len;
2639
2640 if(neg)
2641 continue;
2642 if ((min && val < *min) || (max && val > *max))
2643 continue;
2644 *i = val;
2645 } else {
2646 p = buf;
2647 if (!first)
2648 *p++ = '\t';
2649 sprintf(p, "%lu", convdiv * (*i) / convmul);
2650 len = strlen(buf);
2651 if (len > left)
2652 len = left;
2653 if(copy_to_user(s, buf, len))
2654 return -EFAULT;
2655 left -= len;
2656 s += len;
2657 }
2658 }
2659
2660 if (!write && !first && left) {
2661 if(put_user('\n', s))
2662 return -EFAULT;
2663 left--, s++;
2664 }
2665 if (write) {
2666 while (left) {
2667 char c;
2668 if (get_user(c, s++))
2669 return -EFAULT;
2670 if (!isspace(c))
2671 break;
2672 left--;
2673 }
2674 }
2675 if (write && first)
2676 return -EINVAL;
2677 *lenp -= left;
2678 *ppos += *lenp;
2679 return 0;
2680#undef TMPBUFLEN
2681}
2682
d8217f07 2683static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2684 void __user *buffer,
2685 size_t *lenp, loff_t *ppos,
2686 unsigned long convmul,
2687 unsigned long convdiv)
2688{
2689 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2690 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2691}
2692
1da177e4
LT		 2693/**
2694 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2695 * @table: the sysctl table
2696 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2697 * @buffer: the user buffer
2698 * @lenp: the size of the user buffer
2699 * @ppos: file position
2700 *
2701 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2702 * values from/to the user buffer, treated as an ASCII string.
2703 *
2704 * This routine will ensure the values are within the range specified by
2705 * table->extra1 (min) and table->extra2 (max).
2706 *
2707 * Returns 0 on success.
2708 */
8d65af78 2709int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2710 void __user *buffer, size_t *lenp, loff_t *ppos)
2711{
8d65af78 2712 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2713}
2714
2715/**
2716 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2717 * @table: the sysctl table
2718 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2719 * @buffer: the user buffer
2720 * @lenp: the size of the user buffer
2721 * @ppos: file position
2722 *
2723 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2724 * values from/to the user buffer, treated as an ASCII string. The values
2725 * are treated as milliseconds, and converted to jiffies when they are stored.
2726 *
2727 * This routine will ensure the values are within the range specified by
2728 * table->extra1 (min) and table->extra2 (max).
2729 *
2730 * Returns 0 on success.
2731 */
d8217f07 2732int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2733 void __user *buffer,
2734 size_t *lenp, loff_t *ppos)
2735{
8d65af78 2736 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2737 lenp, ppos, HZ, 1000l);
2738}
2739
2740
2741static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2742 int *valp,
2743 int write, void *data)
2744{
2745 if (write) {
cba9f33d
BS		 2746 if (*lvalp > LONG_MAX / HZ)
2747 return 1;
1da177e4
LT		 2748 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2749 } else {
2750 int val = *valp;
2751 unsigned long lval;
2752 if (val < 0) {
2753 *negp = -1;
2754 lval = (unsigned long)-val;
2755 } else {
2756 *negp = 0;
2757 lval = (unsigned long)val;
2758 }
2759 *lvalp = lval / HZ;
2760 }
2761 return 0;
2762}
2763
2764static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2765 int *valp,
2766 int write, void *data)
2767{
2768 if (write) {
cba9f33d
BS		 2769 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2770 return 1;
1da177e4
LT		 2771 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2772 } else {
2773 int val = *valp;
2774 unsigned long lval;
2775 if (val < 0) {
2776 *negp = -1;
2777 lval = (unsigned long)-val;
2778 } else {
2779 *negp = 0;
2780 lval = (unsigned long)val;
2781 }
2782 *lvalp = jiffies_to_clock_t(lval);
2783 }
2784 return 0;
2785}
2786
2787static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2788 int *valp,
2789 int write, void *data)
2790{
2791 if (write) {
2792 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2793 } else {
2794 int val = *valp;
2795 unsigned long lval;
2796 if (val < 0) {
2797 *negp = -1;
2798 lval = (unsigned long)-val;
2799 } else {
2800 *negp = 0;
2801 lval = (unsigned long)val;
2802 }
2803 *lvalp = jiffies_to_msecs(lval);
2804 }
2805 return 0;
2806}
2807
2808/**
2809 * proc_dointvec_jiffies - read a vector of integers as seconds
2810 * @table: the sysctl table
2811 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2812 * @buffer: the user buffer
2813 * @lenp: the size of the user buffer
2814 * @ppos: file position
2815 *
2816 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2817 * values from/to the user buffer, treated as an ASCII string.
2818 * The values read are assumed to be in seconds, and are converted into
2819 * jiffies.
2820 *
2821 * Returns 0 on success.
2822 */
8d65af78 2823int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2824 void __user *buffer, size_t *lenp, loff_t *ppos)
2825{
8d65af78 2826 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2827 do_proc_dointvec_jiffies_conv,NULL);
2828}
2829
2830/**
2831 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2832 * @table: the sysctl table
2833 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2834 * @buffer: the user buffer
2835 * @lenp: the size of the user buffer
1e5d5331 2836 * @ppos: pointer to the file position
1da177e4
LT		 2837 *
2838 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2839 * values from/to the user buffer, treated as an ASCII string.
2840 * The values read are assumed to be in 1/USER_HZ seconds, and
2841 * are converted into jiffies.
2842 *
2843 * Returns 0 on success.
2844 */
8d65af78 2845int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2846 void __user *buffer, size_t *lenp, loff_t *ppos)
2847{
8d65af78 2848 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2849 do_proc_dointvec_userhz_jiffies_conv,NULL);
2850}
2851
2852/**
2853 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2854 * @table: the sysctl table
2855 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2856 * @buffer: the user buffer
2857 * @lenp: the size of the user buffer
67be2dd1
MW		 2858 * @ppos: file position
2859 * @ppos: the current position in the file
1da177e4
LT		 2860 *
2861 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2862 * values from/to the user buffer, treated as an ASCII string.
2863 * The values read are assumed to be in 1/1000 seconds, and
2864 * are converted into jiffies.
2865 *
2866 * Returns 0 on success.
2867 */
8d65af78 2868int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2869 void __user *buffer, size_t *lenp, loff_t *ppos)
2870{
8d65af78 2871 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2872 do_proc_dointvec_ms_jiffies_conv, NULL);
2873}
2874
8d65af78 2875static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2876 void __user *buffer, size_t *lenp, loff_t *ppos)
2877{
2878 struct pid *new_pid;
2879 pid_t tmp;
2880 int r;
2881
6c5f3e7b 2882 tmp = pid_vnr(cad_pid);
9ec52099 2883
8d65af78 2884 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2885 lenp, ppos, NULL, NULL);
2886 if (r || !write)
2887 return r;
2888
2889 new_pid = find_get_pid(tmp);
2890 if (!new_pid)
2891 return -ESRCH;
2892
2893 put_pid(xchg(&cad_pid, new_pid));
2894 return 0;
2895}
2896
1da177e4
LT		 2897#else /* CONFIG_PROC_FS */
2898
8d65af78 2899int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2900 void __user *buffer, size_t *lenp, loff_t *ppos)
2901{
2902 return -ENOSYS;
2903}
2904
8d65af78 2905int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2906 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2907{
2908 return -ENOSYS;
2909}
2910
8d65af78 2911int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2912 void __user *buffer, size_t *lenp, loff_t *ppos)
2913{
2914 return -ENOSYS;
2915}
2916
8d65af78 2917int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2918 void __user *buffer, size_t *lenp, loff_t *ppos)
2919{
2920 return -ENOSYS;
2921}
2922
8d65af78 2923int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2924 void __user *buffer, size_t *lenp, loff_t *ppos)
2925{
2926 return -ENOSYS;
2927}
2928
8d65af78 2929int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2930 void __user *buffer, size_t *lenp, loff_t *ppos)
2931{
2932 return -ENOSYS;
2933}
2934
8d65af78 2935int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2936 void __user *buffer, size_t *lenp, loff_t *ppos)
2937{
2938 return -ENOSYS;
2939}
2940
d8217f07 2941int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2942 void __user *buffer,
2943 size_t *lenp, loff_t *ppos)
2944{
2945 return -ENOSYS;
2946}
2947
2948
2949#endif /* CONFIG_PROC_FS */
2950
2951
b89a8171 2952#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2953/*
2954 * General sysctl support routines
2955 */
2956
49a0c458 2957/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2958int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2959 void __user *oldval, size_t __user *oldlenp,
2960 void __user *newval, size_t newlen)
2961{
2962 size_t len;
2963
2964 /* Get out of I don't have a variable */
2965 if (!table->data || !table->maxlen)
2966 return -ENOTDIR;
2967
2968 if (oldval && oldlenp) {
2969 if (get_user(len, oldlenp))
2970 return -EFAULT;
2971 if (len) {
2972 if (len > table->maxlen)
2973 len = table->maxlen;
2974 if (copy_to_user(oldval, table->data, len))
2975 return -EFAULT;
2976 if (put_user(len, oldlenp))
2977 return -EFAULT;
2978 }
2979 }
2980
2981 if (newval && newlen) {
2982 if (newlen > table->maxlen)
2983 newlen = table->maxlen;
2984
2985 if (copy_from_user(table->data, newval, newlen))
2986 return -EFAULT;
2987 }
2988 return 1;
2989}
2990
1da177e4 2991/* The generic string strategy routine: */
f221e726 2992int sysctl_string(struct ctl_table *table,
1da177e4 2993 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2994 void __user *newval, size_t newlen)
1da177e4 2995{
1da177e4
LT		 2996 if (!table->data || !table->maxlen)
2997 return -ENOTDIR;
2998
2999 if (oldval && oldlenp) {
de9e007d
LT		 3000 size_t bufsize;
3001 if (get_user(bufsize, oldlenp))
1da177e4 3002 return -EFAULT;
de9e007d
LT		 3003 if (bufsize) {
3004 size_t len = strlen(table->data), copied;
3005
3006 /* This shouldn't trigger for a well-formed sysctl */
3007 if (len > table->maxlen)
1da177e4 3008 len = table->maxlen;
de9e007d
LT		 3009
3010 /* Copy up to a max of bufsize-1 bytes of the string */
3011 copied = (len >= bufsize) ? bufsize - 1 : len;
3012
3013 if (copy_to_user(oldval, table->data, copied) ||
3014 put_user(0, (char __user *)(oldval + copied)))
1da177e4 3015 return -EFAULT;
de9e007d 3016 if (put_user(len, oldlenp))
1da177e4
LT		 3017 return -EFAULT;
3018 }
3019 }
3020 if (newval && newlen) {
de9e007d 3021 size_t len = newlen;
1da177e4
LT		 3022 if (len > table->maxlen)
3023 len = table->maxlen;
3024 if(copy_from_user(table->data, newval, len))
3025 return -EFAULT;
3026 if (len == table->maxlen)
3027 len--;
3028 ((char *) table->data)[len] = 0;
3029 }
82c9df82 3030 return 1;
1da177e4
LT		 3031}
3032
3033/*
3034 * This function makes sure that all of the integers in the vector
3035 * are between the minimum and maximum values given in the arrays
3036 * table->extra1 and table->extra2, respectively.
3037 */
f221e726 3038int sysctl_intvec(struct ctl_table *table,
1da177e4 3039 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3040 void __user *newval, size_t newlen)
1da177e4
LT		 3041{
3042
3043 if (newval && newlen) {
3044 int __user *vec = (int __user *) newval;
3045 int *min = (int *) table->extra1;
3046 int *max = (int *) table->extra2;
3047 size_t length;
3048 int i;
3049
3050 if (newlen % sizeof(int) != 0)
3051 return -EINVAL;
3052
3053 if (!table->extra1 && !table->extra2)
3054 return 0;
3055
3056 if (newlen > table->maxlen)
3057 newlen = table->maxlen;
3058 length = newlen / sizeof(int);
3059
3060 for (i = 0; i < length; i++) {
3061 int value;
3062 if (get_user(value, vec + i))
3063 return -EFAULT;
3064 if (min && value < min[i])
3065 return -EINVAL;
3066 if (max && value > max[i])
3067 return -EINVAL;
3068 }
3069 }
3070 return 0;
3071}
3072
3073/* Strategy function to convert jiffies to seconds */
f221e726 3074int sysctl_jiffies(struct ctl_table *table,
1da177e4 3075 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3076 void __user *newval, size_t newlen)
1da177e4 3077{
3ee75ac3 3078 if (oldval && oldlenp) {
1da177e4 3079 size_t olen;
3ee75ac3
AD		 3080
3081 if (get_user(olen, oldlenp))
3082 return -EFAULT;
3083 if (olen) {
3084 int val;
3085
3086 if (olen < sizeof(int))
3087 return -EINVAL;
3088
3089 val = *(int *)(table->data) / HZ;
3090 if (put_user(val, (int __user *)oldval))
3091 return -EFAULT;
3092 if (put_user(sizeof(int), oldlenp))
1da177e4 3093 return -EFAULT;
1da177e4 3094 }
1da177e4
LT		 3095 }
3096 if (newval && newlen) {
3097 int new;
3098 if (newlen != sizeof(int))
3099 return -EINVAL;
3100 if (get_user(new, (int __user *)newval))
3101 return -EFAULT;
3102 *(int *)(table->data) = new*HZ;
3103 }
3104 return 1;
3105}
3106
3107/* Strategy function to convert jiffies to seconds */
f221e726 3108int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3109 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3110 void __user *newval, size_t newlen)
1da177e4 3111{
3ee75ac3 3112 if (oldval && oldlenp) {
1da177e4 3113 size_t olen;
3ee75ac3
AD		 3114
3115 if (get_user(olen, oldlenp))
3116 return -EFAULT;
3117 if (olen) {
3118 int val;
3119
3120 if (olen < sizeof(int))
3121 return -EINVAL;
3122
3123 val = jiffies_to_msecs(*(int *)(table->data));
3124 if (put_user(val, (int __user *)oldval))
3125 return -EFAULT;
3126 if (put_user(sizeof(int), oldlenp))
1da177e4 3127 return -EFAULT;
1da177e4 3128 }
1da177e4
LT		 3129 }
3130 if (newval && newlen) {
3131 int new;
3132 if (newlen != sizeof(int))
3133 return -EINVAL;
3134 if (get_user(new, (int __user *)newval))
3135 return -EFAULT;
3136 *(int *)(table->data) = msecs_to_jiffies(new);
3137 }
3138 return 1;
3139}
3140
c4b8b769 3141
c4b8b769 3142
b89a8171 3143#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3144
3145
1e7bfb21 3146SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3147{
0e009be8 3148 struct __sysctl_args tmp;
7058cb02 3149 int error;
0e009be8 3150
0e009be8
EB		 3151 if (copy_from_user(&tmp, args, sizeof(tmp)))
3152 return -EFAULT;
0e009be8 3153
7058cb02 3154 error = deprecated_sysctl_warning(&tmp);
b89a8171 3155
7058cb02
EB		 3156 /* If no error reading the parameters then just -ENOSYS ... */
3157 if (!error)
3158 error = -ENOSYS;
3159
3160 return error;
1da177e4
LT		 3161}
3162
f221e726 3163int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3164 void __user *oldval, size_t __user *oldlenp,
3165 void __user *newval, size_t newlen)
3166{
3167 return -ENOSYS;
3168}
3169
f221e726 3170int sysctl_string(struct ctl_table *table,
1da177e4 3171 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3172 void __user *newval, size_t newlen)
1da177e4
LT		 3173{
3174 return -ENOSYS;
3175}
3176
f221e726 3177int sysctl_intvec(struct ctl_table *table,
1da177e4 3178 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3179 void __user *newval, size_t newlen)
1da177e4
LT		 3180{
3181 return -ENOSYS;
3182}
3183
f221e726 3184int sysctl_jiffies(struct ctl_table *table,
1da177e4 3185 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3186 void __user *newval, size_t newlen)
1da177e4
LT		 3187{
3188 return -ENOSYS;
3189}
3190
f221e726 3191int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3192 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3193 void __user *newval, size_t newlen)
1da177e4
LT		 3194{
3195 return -ENOSYS;
3196}
3197
b89a8171 3198#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3199
7058cb02
EB		 3200static int deprecated_sysctl_warning(struct __sysctl_args *args)
3201{
3202 static int msg_count;
3203 int name[CTL_MAXNAME];
3204 int i;
3205
6fc48af8
TH		 3206 /* Check args->nlen. */
3207 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3208 return -ENOTDIR;
3209
7058cb02
EB		 3210 /* Read in the sysctl name for better debug message logging */
3211 for (i = 0; i < args->nlen; i++)
3212 if (get_user(name[i], args->name + i))
3213 return -EFAULT;
3214
3215 /* Ignore accesses to kernel.version */
3216 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3217 return 0;
3218
3219 if (msg_count < 5) {
3220 msg_count++;
3221 printk(KERN_INFO
3222 "warning: process `%s' used the deprecated sysctl "
3223 "system call with ", current->comm);
3224 for (i = 0; i < args->nlen; i++)
3225 printk("%d.", name[i]);
3226 printk("\n");
3227 }
3228 return 0;
3229}
3230
1da177e4
LT		 3231/*
3232 * No sense putting this after each symbol definition, twice,
3233 * exception granted :-)
3234 */
3235EXPORT_SYMBOL(proc_dointvec);
3236EXPORT_SYMBOL(proc_dointvec_jiffies);
3237EXPORT_SYMBOL(proc_dointvec_minmax);
3238EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3239EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3240EXPORT_SYMBOL(proc_dostring);
3241EXPORT_SYMBOL(proc_doulongvec_minmax);
3242EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3243EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3244EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3245EXPORT_SYMBOL(sysctl_intvec);
3246EXPORT_SYMBOL(sysctl_jiffies);
3247EXPORT_SYMBOL(sysctl_ms_jiffies);
3248EXPORT_SYMBOL(sysctl_string);
49a0c458 3249EXPORT_SYMBOL(sysctl_data);
1da177e4 3250EXPORT_SYMBOL(unregister_sysctl_table);
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