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be2net: Implement ethtool get_phys_id function.
[net-next-2.6.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>
39#include <linux/hugetlb.h>
1da177e4 40#include <linux/initrd.h>
0b77f5bf 41#include <linux/key.h>
1da177e4
LT		 42#include <linux/times.h>
43#include <linux/limits.h>
44#include <linux/dcache.h>
45#include <linux/syscalls.h>
c748e134 46#include <linux/vmstat.h>
c255d844
PM		 47#include <linux/nfs_fs.h>
48#include <linux/acpi.h>
10a0a8d4 49#include <linux/reboot.h>
b0fc494f 50#include <linux/ftrace.h>
12e22c5e 51#include <linux/slow-work.h>
cdd6c482 52#include <linux/perf_event.h>
1da177e4
LT		 53
54#include <asm/uaccess.h>
55#include <asm/processor.h>
56
29cbc78b
AK		 57#ifdef CONFIG_X86
58#include <asm/nmi.h>
0741f4d2 59#include <asm/stacktrace.h>
6e7c4025 60#include <asm/io.h>
29cbc78b
AK		 61#endif
62
7058cb02
EB		 63static int deprecated_sysctl_warning(struct __sysctl_args *args);
64
1da177e4
LT		 65#if defined(CONFIG_SYSCTL)
66
67/* External variables not in a header file. */
68extern int C_A_D;
45807a1d 69extern int print_fatal_signals;
1da177e4
LT		 70extern int sysctl_overcommit_memory;
71extern int sysctl_overcommit_ratio;
fadd8fbd 72extern int sysctl_panic_on_oom;
fe071d7e 73extern int sysctl_oom_kill_allocating_task;
fef1bdd6 74extern int sysctl_oom_dump_tasks;
1da177e4 75extern int max_threads;
1da177e4 76extern int core_uses_pid;
d6e71144 77extern int suid_dumpable;
1da177e4 78extern char core_pattern[];
a293980c 79extern unsigned int core_pipe_limit;
1da177e4
LT		 80extern int pid_max;
81extern int min_free_kbytes;
1da177e4 82extern int pid_max_min, pid_max_max;
9d0243bc 83extern int sysctl_drop_caches;
8ad4b1fb 84extern int percpu_pagelist_fraction;
bebfa101 85extern int compat_log;
9745512c 86extern int latencytop_enabled;
eceea0b3 87extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 88#ifndef CONFIG_MMU
89extern int sysctl_nr_trim_pages;
90#endif
31a72bce
PM		 91#ifdef CONFIG_RCU_TORTURE_TEST
92extern int rcutorture_runnable;
93#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
cb684b5b 94#ifdef CONFIG_BLOCK
5e605b64 95extern int blk_iopoll_enabled;
cb684b5b 96#endif
1da177e4 97
c4f3b63f 98/* Constants used for minimum and maximum */
195cf453 99#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 100static int sixty = 60;
9383d967 101static int neg_one = -1;
c4f3b63f
RT		 102#endif
103
c4f3b63f 104static int zero;
cd5f9a4c
LT		 105static int __maybe_unused one = 1;
106static int __maybe_unused two = 2;
fc3501d4 107static unsigned long one_ul = 1;
c4f3b63f 108static int one_hundred = 100;
af91322e
DY		 109#ifdef CONFIG_PRINTK
110static int ten_thousand = 10000;
111#endif
c4f3b63f 112
9e4a5bda
AR		 113/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
114static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
115
1da177e4
LT		 116/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
117static int maxolduid = 65535;
118static int minolduid;
8ad4b1fb 119static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 120
121static int ngroups_max = NGROUPS_MAX;
122
a1ef5adb 123#ifdef CONFIG_MODULES
1da177e4 124extern char modprobe_path[];
3d43321b 125extern int modules_disabled;
1da177e4 126#endif
1da177e4
LT		 127#ifdef CONFIG_CHR_DEV_SG
128extern int sg_big_buff;
129#endif
1da177e4 130
72c57ed5 131#ifdef CONFIG_SPARC
17f04fbb 132#include <asm/system.h>
1da177e4
LT		 133#endif
134
0871420f
DM		 135#ifdef CONFIG_SPARC64
136extern int sysctl_tsb_ratio;
137#endif
138
1da177e4
LT		 139#ifdef __hppa__
140extern int pwrsw_enabled;
141extern int unaligned_enabled;
142#endif
143
347a8dc3 144#ifdef CONFIG_S390
1da177e4
LT		 145#ifdef CONFIG_MATHEMU
146extern int sysctl_ieee_emulation_warnings;
147#endif
148extern int sysctl_userprocess_debug;
951f22d5 149extern int spin_retry;
1da177e4
LT		 150#endif
151
1da177e4
LT		 152#ifdef CONFIG_BSD_PROCESS_ACCT
153extern int acct_parm[];
154#endif
155
d2b176ed
JS		 156#ifdef CONFIG_IA64
157extern int no_unaligned_warning;
88fc241f 158extern int unaligned_dump_stack;
d2b176ed
JS		 159#endif
160
23f78d4a
IM		 161#ifdef CONFIG_RT_MUTEXES
162extern int max_lock_depth;
163#endif
164
d6f8ff73 165#ifdef CONFIG_PROC_SYSCTL
8d65af78 166static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099 167 void __user *buffer, size_t *lenp, loff_t *ppos);
8d65af78 168static int proc_taint(struct ctl_table *table, int write,
34f5a398 169 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 170#endif
9ec52099 171
d8217f07 172static struct ctl_table root_table[];
e51b6ba0
EB		 173static struct ctl_table_root sysctl_table_root;
174static struct ctl_table_header root_table_header = {
b380b0d4 175 .count = 1,
e51b6ba0 176 .ctl_table = root_table,
73455092 177 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 178 .root = &sysctl_table_root,
73455092 179 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 180};
181static struct ctl_table_root sysctl_table_root = {
182 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 183 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 184};
1da177e4 185
d8217f07
EB		 186static struct ctl_table kern_table[];
187static struct ctl_table vm_table[];
188static struct ctl_table fs_table[];
189static struct ctl_table debug_table[];
190static struct ctl_table dev_table[];
191extern struct ctl_table random_table[];
2d9048e2 192#ifdef CONFIG_INOTIFY_USER
d8217f07 193extern struct ctl_table inotify_table[];
0399cb08 194#endif
7ef9964e
DL		 195#ifdef CONFIG_EPOLL
196extern struct ctl_table epoll_table[];
197#endif
1da177e4
LT		 198
199#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
200int sysctl_legacy_va_layout;
201#endif
202
f20786ff
PZ		 203extern int prove_locking;
204extern int lock_stat;
9bc9a6bd 205
1da177e4
LT		 206/* The default sysctl tables: */
207
d8217f07 208static struct ctl_table root_table[] = {
1da177e4
LT		 209 {
210 .ctl_name = CTL_KERN,
211 .procname = "kernel",
212 .mode = 0555,
213 .child = kern_table,
214 },
215 {
216 .ctl_name = CTL_VM,
217 .procname = "vm",
218 .mode = 0555,
219 .child = vm_table,
220 },
1da177e4
LT		 221 {
222 .ctl_name = CTL_FS,
223 .procname = "fs",
224 .mode = 0555,
225 .child = fs_table,
226 },
227 {
228 .ctl_name = CTL_DEBUG,
229 .procname = "debug",
230 .mode = 0555,
231 .child = debug_table,
232 },
233 {
234 .ctl_name = CTL_DEV,
235 .procname = "dev",
236 .mode = 0555,
237 .child = dev_table,
238 },
2be7fe07
AM		 239/*
240 * NOTE: do not add new entries to this table unless you have read
241 * Documentation/sysctl/ctl_unnumbered.txt
242 */
1da177e4
LT		 243 { .ctl_name = 0 }
244};
245
77e54a1f 246#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 247static int min_sched_granularity_ns = 100000; /* 100 usecs */
248static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
249static int min_wakeup_granularity_ns; /* 0 usecs */
250static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 251#endif
252
d8217f07 253static struct ctl_table kern_table[] = {
2bba22c5
MG		 254 {
255 .ctl_name = CTL_UNNUMBERED,
256 .procname = "sched_child_runs_first",
257 .data = &sysctl_sched_child_runs_first,
258 .maxlen = sizeof(unsigned int),
259 .mode = 0644,
260 .proc_handler = &proc_dointvec,
261 },
77e54a1f
IM		 262#ifdef CONFIG_SCHED_DEBUG
263 {
264 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 265 .procname = "sched_min_granularity_ns",
266 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 267 .maxlen = sizeof(unsigned int),
268 .mode = 0644,
b2be5e96
PZ		 269 .proc_handler = &sched_nr_latency_handler,
270 .strategy = &sysctl_intvec,
271 .extra1 = &min_sched_granularity_ns,
272 .extra2 = &max_sched_granularity_ns,
77e54a1f 273 },
21805085
PZ		 274 {
275 .ctl_name = CTL_UNNUMBERED,
276 .procname = "sched_latency_ns",
277 .data = &sysctl_sched_latency,
278 .maxlen = sizeof(unsigned int),
279 .mode = 0644,
b2be5e96 280 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 281 .strategy = &sysctl_intvec,
282 .extra1 = &min_sched_granularity_ns,
283 .extra2 = &max_sched_granularity_ns,
284 },
77e54a1f
IM		 285 {
286 .ctl_name = CTL_UNNUMBERED,
287 .procname = "sched_wakeup_granularity_ns",
288 .data = &sysctl_sched_wakeup_granularity,
289 .maxlen = sizeof(unsigned int),
290 .mode = 0644,
291 .proc_handler = &proc_dointvec_minmax,
292 .strategy = &sysctl_intvec,
77e54a1f
IM		 293 .extra1 = &min_wakeup_granularity_ns,
294 .extra2 = &max_wakeup_granularity_ns,
295 },
2398f2c6
PZ		 296 {
297 .ctl_name = CTL_UNNUMBERED,
298 .procname = "sched_shares_ratelimit",
299 .data = &sysctl_sched_shares_ratelimit,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
302 .proc_handler = &proc_dointvec,
303 },
ffda12a1
PZ		 304 {
305 .ctl_name = CTL_UNNUMBERED,
306 .procname = "sched_shares_thresh",
307 .data = &sysctl_sched_shares_thresh,
308 .maxlen = sizeof(unsigned int),
309 .mode = 0644,
310 .proc_handler = &proc_dointvec_minmax,
311 .strategy = &sysctl_intvec,
312 .extra1 = &zero,
313 },
1fc84aaa
PZ		 314 {
315 .ctl_name = CTL_UNNUMBERED,
316 .procname = "sched_features",
317 .data = &sysctl_sched_features,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = &proc_dointvec,
321 },
da84d961
IM		 322 {
323 .ctl_name = CTL_UNNUMBERED,
324 .procname = "sched_migration_cost",
325 .data = &sysctl_sched_migration_cost,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = &proc_dointvec,
329 },
b82d9fdd
PZ		 330 {
331 .ctl_name = CTL_UNNUMBERED,
332 .procname = "sched_nr_migrate",
333 .data = &sysctl_sched_nr_migrate,
334 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 335 .mode = 0644,
336 .proc_handler = &proc_dointvec,
337 },
e9e9250b
PZ		 338 {
339 .ctl_name = CTL_UNNUMBERED,
340 .procname = "sched_time_avg",
341 .data = &sysctl_sched_time_avg,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
344 .proc_handler = &proc_dointvec,
345 },
cd1bb94b
AB		 346 {
347 .ctl_name = CTL_UNNUMBERED,
348 .procname = "timer_migration",
349 .data = &sysctl_timer_migration,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
bfdb4d9f
AB		 352 .proc_handler = &proc_dointvec_minmax,
353 .strategy = &sysctl_intvec,
354 .extra1 = &zero,
355 .extra2 = &one,
fa85ae24 356 },
1fc84aaa 357#endif
9f0c1e56
PZ		 358 {
359 .ctl_name = CTL_UNNUMBERED,
360 .procname = "sched_rt_period_us",
361 .data = &sysctl_sched_rt_period,
362 .maxlen = sizeof(unsigned int),
363 .mode = 0644,
d0b27fa7 364 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 365 },
366 {
367 .ctl_name = CTL_UNNUMBERED,
368 .procname = "sched_rt_runtime_us",
369 .data = &sysctl_sched_rt_runtime,
370 .maxlen = sizeof(int),
371 .mode = 0644,
d0b27fa7 372 .proc_handler = &sched_rt_handler,
9f0c1e56 373 },
1799e35d
IM		 374 {
375 .ctl_name = CTL_UNNUMBERED,
376 .procname = "sched_compat_yield",
377 .data = &sysctl_sched_compat_yield,
378 .maxlen = sizeof(unsigned int),
379 .mode = 0644,
380 .proc_handler = &proc_dointvec,
381 },
f20786ff
PZ		 382#ifdef CONFIG_PROVE_LOCKING
383 {
384 .ctl_name = CTL_UNNUMBERED,
385 .procname = "prove_locking",
386 .data = &prove_locking,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = &proc_dointvec,
390 },
391#endif
392#ifdef CONFIG_LOCK_STAT
393 {
394 .ctl_name = CTL_UNNUMBERED,
395 .procname = "lock_stat",
396 .data = &lock_stat,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = &proc_dointvec,
400 },
77e54a1f 401#endif
1da177e4
LT		 402 {
403 .ctl_name = KERN_PANIC,
404 .procname = "panic",
405 .data = &panic_timeout,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = &proc_dointvec,
409 },
410 {
411 .ctl_name = KERN_CORE_USES_PID,
412 .procname = "core_uses_pid",
413 .data = &core_uses_pid,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = &proc_dointvec,
417 },
418 {
419 .ctl_name = KERN_CORE_PATTERN,
420 .procname = "core_pattern",
421 .data = core_pattern,
71ce92f3 422 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 423 .mode = 0644,
424 .proc_handler = &proc_dostring,
425 .strategy = &sysctl_string,
426 },
a293980c
NH		 427 {
428 .ctl_name = CTL_UNNUMBERED,
429 .procname = "core_pipe_limit",
430 .data = &core_pipe_limit,
431 .maxlen = sizeof(unsigned int),
432 .mode = 0644,
433 .proc_handler = &proc_dointvec,
434 },
34f5a398 435#ifdef CONFIG_PROC_SYSCTL
1da177e4 436 {
1da177e4 437 .procname = "tainted",
25ddbb18 438 .maxlen = sizeof(long),
34f5a398 439 .mode = 0644,
25ddbb18 440 .proc_handler = &proc_taint,
1da177e4 441 },
34f5a398 442#endif
9745512c
AV		 443#ifdef CONFIG_LATENCYTOP
444 {
445 .procname = "latencytop",
446 .data = &latencytop_enabled,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = &proc_dointvec,
450 },
451#endif
1da177e4
LT		 452#ifdef CONFIG_BLK_DEV_INITRD
453 {
454 .ctl_name = KERN_REALROOTDEV,
455 .procname = "real-root-dev",
456 .data = &real_root_dev,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = &proc_dointvec,
460 },
461#endif
45807a1d
IM		 462 {
463 .ctl_name = CTL_UNNUMBERED,
464 .procname = "print-fatal-signals",
465 .data = &print_fatal_signals,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = &proc_dointvec,
469 },
72c57ed5 470#ifdef CONFIG_SPARC
1da177e4
LT		 471 {
472 .ctl_name = KERN_SPARC_REBOOT,
473 .procname = "reboot-cmd",
474 .data = reboot_command,
475 .maxlen = 256,
476 .mode = 0644,
477 .proc_handler = &proc_dostring,
478 .strategy = &sysctl_string,
479 },
480 {
481 .ctl_name = KERN_SPARC_STOP_A,
482 .procname = "stop-a",
483 .data = &stop_a_enabled,
484 .maxlen = sizeof (int),
485 .mode = 0644,
486 .proc_handler = &proc_dointvec,
487 },
488 {
489 .ctl_name = KERN_SPARC_SCONS_PWROFF,
490 .procname = "scons-poweroff",
491 .data = &scons_pwroff,
492 .maxlen = sizeof (int),
493 .mode = 0644,
494 .proc_handler = &proc_dointvec,
495 },
496#endif
0871420f
DM		 497#ifdef CONFIG_SPARC64
498 {
499 .ctl_name = CTL_UNNUMBERED,
500 .procname = "tsb-ratio",
501 .data = &sysctl_tsb_ratio,
502 .maxlen = sizeof (int),
503 .mode = 0644,
504 .proc_handler = &proc_dointvec,
505 },
506#endif
1da177e4
LT		 507#ifdef __hppa__
508 {
509 .ctl_name = KERN_HPPA_PWRSW,
510 .procname = "soft-power",
511 .data = &pwrsw_enabled,
512 .maxlen = sizeof (int),
513 .mode = 0644,
514 .proc_handler = &proc_dointvec,
515 },
516 {
517 .ctl_name = KERN_HPPA_UNALIGNED,
518 .procname = "unaligned-trap",
519 .data = &unaligned_enabled,
520 .maxlen = sizeof (int),
521 .mode = 0644,
522 .proc_handler = &proc_dointvec,
523 },
524#endif
525 {
526 .ctl_name = KERN_CTLALTDEL,
527 .procname = "ctrl-alt-del",
528 .data = &C_A_D,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = &proc_dointvec,
532 },
606576ce 533#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 534 {
535 .ctl_name = CTL_UNNUMBERED,
536 .procname = "ftrace_enabled",
537 .data = &ftrace_enabled,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = &ftrace_enable_sysctl,
541 },
542#endif
f38f1d2a
SR		 543#ifdef CONFIG_STACK_TRACER
544 {
545 .ctl_name = CTL_UNNUMBERED,
546 .procname = "stack_tracer_enabled",
547 .data = &stack_tracer_enabled,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 .proc_handler = &stack_trace_sysctl,
551 },
552#endif
944ac425
SR		 553#ifdef CONFIG_TRACING
554 {
555 .ctl_name = CTL_UNNUMBERED,
3299b4dd 556 .procname = "ftrace_dump_on_oops",
944ac425
SR		 557 .data = &ftrace_dump_on_oops,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 .proc_handler = &proc_dointvec,
561 },
562#endif
a1ef5adb 563#ifdef CONFIG_MODULES
1da177e4
LT		 564 {
565 .ctl_name = KERN_MODPROBE,
566 .procname = "modprobe",
567 .data = &modprobe_path,
568 .maxlen = KMOD_PATH_LEN,
569 .mode = 0644,
570 .proc_handler = &proc_dostring,
571 .strategy = &sysctl_string,
572 },
3d43321b
KC		 573 {
574 .ctl_name = CTL_UNNUMBERED,
575 .procname = "modules_disabled",
576 .data = &modules_disabled,
577 .maxlen = sizeof(int),
578 .mode = 0644,
579 /* only handle a transition from default "0" to "1" */
580 .proc_handler = &proc_dointvec_minmax,
581 .extra1 = &one,
582 .extra2 = &one,
583 },
1da177e4 584#endif
57ae2508 585#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 586 {
587 .ctl_name = KERN_HOTPLUG,
588 .procname = "hotplug",
312c004d
KS		 589 .data = &uevent_helper,
590 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 591 .mode = 0644,
592 .proc_handler = &proc_dostring,
593 .strategy = &sysctl_string,
594 },
595#endif
596#ifdef CONFIG_CHR_DEV_SG
597 {
598 .ctl_name = KERN_SG_BIG_BUFF,
599 .procname = "sg-big-buff",
600 .data = &sg_big_buff,
601 .maxlen = sizeof (int),
602 .mode = 0444,
603 .proc_handler = &proc_dointvec,
604 },
605#endif
606#ifdef CONFIG_BSD_PROCESS_ACCT
607 {
608 .ctl_name = KERN_ACCT,
609 .procname = "acct",
610 .data = &acct_parm,
611 .maxlen = 3*sizeof(int),
612 .mode = 0644,
613 .proc_handler = &proc_dointvec,
614 },
615#endif
1da177e4
LT		 616#ifdef CONFIG_MAGIC_SYSRQ
617 {
618 .ctl_name = KERN_SYSRQ,
619 .procname = "sysrq",
5d6f647f 620 .data = &__sysrq_enabled,
1da177e4
LT		 621 .maxlen = sizeof (int),
622 .mode = 0644,
623 .proc_handler = &proc_dointvec,
624 },
625#endif
d6f8ff73 626#ifdef CONFIG_PROC_SYSCTL
1da177e4 627 {
1da177e4 628 .procname = "cad_pid",
9ec52099 629 .data = NULL,
1da177e4
LT		 630 .maxlen = sizeof (int),
631 .mode = 0600,
9ec52099 632 .proc_handler = &proc_do_cad_pid,
1da177e4 633 },
d6f8ff73 634#endif
1da177e4
LT		 635 {
636 .ctl_name = KERN_MAX_THREADS,
637 .procname = "threads-max",
638 .data = &max_threads,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 .proc_handler = &proc_dointvec,
642 },
643 {
644 .ctl_name = KERN_RANDOM,
645 .procname = "random",
646 .mode = 0555,
647 .child = random_table,
648 },
1da177e4
LT		 649 {
650 .ctl_name = KERN_OVERFLOWUID,
651 .procname = "overflowuid",
652 .data = &overflowuid,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = &proc_dointvec_minmax,
656 .strategy = &sysctl_intvec,
657 .extra1 = &minolduid,
658 .extra2 = &maxolduid,
659 },
660 {
661 .ctl_name = KERN_OVERFLOWGID,
662 .procname = "overflowgid",
663 .data = &overflowgid,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 .proc_handler = &proc_dointvec_minmax,
667 .strategy = &sysctl_intvec,
668 .extra1 = &minolduid,
669 .extra2 = &maxolduid,
670 },
347a8dc3 671#ifdef CONFIG_S390
1da177e4
LT		 672#ifdef CONFIG_MATHEMU
673 {
674 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
675 .procname = "ieee_emulation_warnings",
676 .data = &sysctl_ieee_emulation_warnings,
677 .maxlen = sizeof(int),
678 .mode = 0644,
679 .proc_handler = &proc_dointvec,
680 },
1da177e4
LT		 681#endif
682 {
683 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
684 .procname = "userprocess_debug",
685 .data = &sysctl_userprocess_debug,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = &proc_dointvec,
689 },
690#endif
691 {
692 .ctl_name = KERN_PIDMAX,
693 .procname = "pid_max",
694 .data = &pid_max,
695 .maxlen = sizeof (int),
696 .mode = 0644,
697 .proc_handler = &proc_dointvec_minmax,
698 .strategy = sysctl_intvec,
699 .extra1 = &pid_max_min,
700 .extra2 = &pid_max_max,
701 },
702 {
703 .ctl_name = KERN_PANIC_ON_OOPS,
704 .procname = "panic_on_oops",
705 .data = &panic_on_oops,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = &proc_dointvec,
709 },
7ef3d2fd
JP		 710#if defined CONFIG_PRINTK
711 {
712 .ctl_name = KERN_PRINTK,
713 .procname = "printk",
714 .data = &console_loglevel,
715 .maxlen = 4*sizeof(int),
716 .mode = 0644,
717 .proc_handler = &proc_dointvec,
718 },
1da177e4
LT		 719 {
720 .ctl_name = KERN_PRINTK_RATELIMIT,
721 .procname = "printk_ratelimit",
717115e1 722 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 723 .maxlen = sizeof(int),
724 .mode = 0644,
725 .proc_handler = &proc_dointvec_jiffies,
726 .strategy = &sysctl_jiffies,
727 },
728 {
729 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
730 .procname = "printk_ratelimit_burst",
717115e1 731 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 732 .maxlen = sizeof(int),
733 .mode = 0644,
734 .proc_handler = &proc_dointvec,
735 },
af91322e
DY		 736 {
737 .ctl_name = CTL_UNNUMBERED,
738 .procname = "printk_delay",
739 .data = &printk_delay_msec,
740 .maxlen = sizeof(int),
741 .mode = 0644,
742 .proc_handler = &proc_dointvec_minmax,
743 .strategy = &sysctl_intvec,
744 .extra1 = &zero,
745 .extra2 = &ten_thousand,
746 },
7ef3d2fd 747#endif
1da177e4
LT		 748 {
749 .ctl_name = KERN_NGROUPS_MAX,
750 .procname = "ngroups_max",
751 .data = &ngroups_max,
752 .maxlen = sizeof (int),
753 .mode = 0444,
754 .proc_handler = &proc_dointvec,
755 },
756#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
757 {
758 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
759 .procname = "unknown_nmi_panic",
760 .data = &unknown_nmi_panic,
761 .maxlen = sizeof (int),
762 .mode = 0644,
2fbe7b25 763 .proc_handler = &proc_dointvec,
1da177e4 764 },
407984f1 765 {
407984f1
DZ		 766 .procname = "nmi_watchdog",
767 .data = &nmi_watchdog_enabled,
768 .maxlen = sizeof (int),
769 .mode = 0644,
770 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 771 },
772#endif
773#if defined(CONFIG_X86)
8da5adda
DZ		 774 {
775 .ctl_name = KERN_PANIC_ON_NMI,
776 .procname = "panic_on_unrecovered_nmi",
777 .data = &panic_on_unrecovered_nmi,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = &proc_dointvec,
781 },
5211a242
KG		 782 {
783 .ctl_name = CTL_UNNUMBERED,
784 .procname = "panic_on_io_nmi",
785 .data = &panic_on_io_nmi,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = &proc_dointvec,
789 },
1da177e4
LT		 790 {
791 .ctl_name = KERN_BOOTLOADER_TYPE,
792 .procname = "bootloader_type",
793 .data = &bootloader_type,
794 .maxlen = sizeof (int),
795 .mode = 0444,
796 .proc_handler = &proc_dointvec,
797 },
5031296c
PA		 798 {
799 .ctl_name = CTL_UNNUMBERED,
800 .procname = "bootloader_version",
801 .data = &bootloader_version,
802 .maxlen = sizeof (int),
803 .mode = 0444,
804 .proc_handler = &proc_dointvec,
805 },
0741f4d2
CE		 806 {
807 .ctl_name = CTL_UNNUMBERED,
808 .procname = "kstack_depth_to_print",
809 .data = &kstack_depth_to_print,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = &proc_dointvec,
813 },
6e7c4025
IM		 814 {
815 .ctl_name = CTL_UNNUMBERED,
816 .procname = "io_delay_type",
817 .data = &io_delay_type,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = &proc_dointvec,
821 },
1da177e4 822#endif
7a9166e3 823#if defined(CONFIG_MMU)
1da177e4
LT		 824 {
825 .ctl_name = KERN_RANDOMIZE,
826 .procname = "randomize_va_space",
827 .data = &randomize_va_space,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = &proc_dointvec,
831 },
7a9166e3 832#endif
0152fb37 833#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 834 {
835 .ctl_name = KERN_SPIN_RETRY,
836 .procname = "spin_retry",
837 .data = &spin_retry,
838 .maxlen = sizeof (int),
839 .mode = 0644,
840 .proc_handler = &proc_dointvec,
841 },
c255d844 842#endif
673d5b43 843#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 844 {
c255d844 845 .procname = "acpi_video_flags",
77afcf78 846 .data = &acpi_realmode_flags,
c255d844
PM		 847 .maxlen = sizeof (unsigned long),
848 .mode = 0644,
7f99f06f 849 .proc_handler = &proc_doulongvec_minmax,
c255d844 850 },
d2b176ed
JS		 851#endif
852#ifdef CONFIG_IA64
853 {
854 .ctl_name = KERN_IA64_UNALIGNED,
855 .procname = "ignore-unaligned-usertrap",
856 .data = &no_unaligned_warning,
857 .maxlen = sizeof (int),
858 .mode = 0644,
859 .proc_handler = &proc_dointvec,
860 },
88fc241f
DC		 861 {
862 .ctl_name = CTL_UNNUMBERED,
863 .procname = "unaligned-dump-stack",
864 .data = &unaligned_dump_stack,
865 .maxlen = sizeof (int),
866 .mode = 0644,
867 .proc_handler = &proc_dointvec,
868 },
bebfa101 869#endif
c4f3b63f 870#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 871 {
872 .ctl_name = CTL_UNNUMBERED,
873 .procname = "softlockup_panic",
874 .data = &softlockup_panic,
875 .maxlen = sizeof(int),
876 .mode = 0644,
4dca10a9 877 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 878 .strategy = &sysctl_intvec,
879 .extra1 = &zero,
880 .extra2 = &one,
881 },
c4f3b63f
RT		 882 {
883 .ctl_name = CTL_UNNUMBERED,
884 .procname = "softlockup_thresh",
885 .data = &softlockup_thresh,
9383d967 886 .maxlen = sizeof(int),
c4f3b63f 887 .mode = 0644,
baf48f65 888 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 889 .strategy = &sysctl_intvec,
9383d967 890 .extra1 = &neg_one,
c4f3b63f
RT		 891 .extra2 = &sixty,
892 },
e162b39a
MSB		 893#endif
894#ifdef CONFIG_DETECT_HUNG_TASK
895 {
896 .ctl_name = CTL_UNNUMBERED,
897 .procname = "hung_task_panic",
898 .data = &sysctl_hung_task_panic,
899 .maxlen = sizeof(int),
900 .mode = 0644,
901 .proc_handler = &proc_dointvec_minmax,
902 .strategy = &sysctl_intvec,
903 .extra1 = &zero,
904 .extra2 = &one,
905 },
82a1fcb9
IM		 906 {
907 .ctl_name = CTL_UNNUMBERED,
908 .procname = "hung_task_check_count",
909 .data = &sysctl_hung_task_check_count,
90739081 910 .maxlen = sizeof(unsigned long),
82a1fcb9 911 .mode = 0644,
90739081 912 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 913 .strategy = &sysctl_intvec,
914 },
915 {
916 .ctl_name = CTL_UNNUMBERED,
917 .procname = "hung_task_timeout_secs",
918 .data = &sysctl_hung_task_timeout_secs,
90739081 919 .maxlen = sizeof(unsigned long),
82a1fcb9 920 .mode = 0644,
e162b39a 921 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 922 .strategy = &sysctl_intvec,
923 },
924 {
925 .ctl_name = CTL_UNNUMBERED,
926 .procname = "hung_task_warnings",
927 .data = &sysctl_hung_task_warnings,
90739081 928 .maxlen = sizeof(unsigned long),
82a1fcb9 929 .mode = 0644,
90739081 930 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 931 .strategy = &sysctl_intvec,
932 },
c4f3b63f 933#endif
bebfa101
AK		 934#ifdef CONFIG_COMPAT
935 {
936 .ctl_name = KERN_COMPAT_LOG,
937 .procname = "compat-log",
938 .data = &compat_log,
939 .maxlen = sizeof (int),
940 .mode = 0644,
941 .proc_handler = &proc_dointvec,
942 },
951f22d5 943#endif
23f78d4a
IM		 944#ifdef CONFIG_RT_MUTEXES
945 {
946 .ctl_name = KERN_MAX_LOCK_DEPTH,
947 .procname = "max_lock_depth",
948 .data = &max_lock_depth,
949 .maxlen = sizeof(int),
950 .mode = 0644,
951 .proc_handler = &proc_dointvec,
952 },
5096add8 953#endif
10a0a8d4
JF		 954 {
955 .ctl_name = CTL_UNNUMBERED,
956 .procname = "poweroff_cmd",
957 .data = &poweroff_cmd,
958 .maxlen = POWEROFF_CMD_PATH_LEN,
959 .mode = 0644,
960 .proc_handler = &proc_dostring,
961 .strategy = &sysctl_string,
962 },
0b77f5bf
DH		 963#ifdef CONFIG_KEYS
964 {
965 .ctl_name = CTL_UNNUMBERED,
966 .procname = "keys",
967 .mode = 0555,
968 .child = key_sysctls,
969 },
970#endif
31a72bce
PM		 971#ifdef CONFIG_RCU_TORTURE_TEST
972 {
973 .ctl_name = CTL_UNNUMBERED,
974 .procname = "rcutorture_runnable",
975 .data = &rcutorture_runnable,
976 .maxlen = sizeof(int),
977 .mode = 0644,
978 .proc_handler = &proc_dointvec,
979 },
980#endif
12e22c5e
DH		 981#ifdef CONFIG_SLOW_WORK
982 {
983 .ctl_name = CTL_UNNUMBERED,
984 .procname = "slow-work",
985 .mode = 0555,
986 .child = slow_work_sysctls,
987 },
988#endif
cdd6c482 989#ifdef CONFIG_PERF_EVENTS
1ccd1549
PZ		 990 {
991 .ctl_name = CTL_UNNUMBERED,
cdd6c482
IM		 992 .procname = "perf_event_paranoid",
993 .data = &sysctl_perf_event_paranoid,
994 .maxlen = sizeof(sysctl_perf_event_paranoid),
1ccd1549
PZ		 995 .mode = 0644,
996 .proc_handler = &proc_dointvec,
997 },
c5078f78
PZ		 998 {
999 .ctl_name = CTL_UNNUMBERED,
cdd6c482
IM		 1000 .procname = "perf_event_mlock_kb",
1001 .data = &sysctl_perf_event_mlock,
1002 .maxlen = sizeof(sysctl_perf_event_mlock),
c5078f78
PZ		 1003 .mode = 0644,
1004 .proc_handler = &proc_dointvec,
1005 },
a78ac325
PZ		 1006 {
1007 .ctl_name = CTL_UNNUMBERED,
cdd6c482
IM		 1008 .procname = "perf_event_max_sample_rate",
1009 .data = &sysctl_perf_event_sample_rate,
1010 .maxlen = sizeof(sysctl_perf_event_sample_rate),
a78ac325
PZ		 1011 .mode = 0644,
1012 .proc_handler = &proc_dointvec,
1013 },
1ccd1549 1014#endif
dfec072e
VN		 1015#ifdef CONFIG_KMEMCHECK
1016 {
1017 .ctl_name = CTL_UNNUMBERED,
1018 .procname = "kmemcheck",
1019 .data = &kmemcheck_enabled,
1020 .maxlen = sizeof(int),
1021 .mode = 0644,
1022 .proc_handler = &proc_dointvec,
1023 },
1024#endif
cb684b5b 1025#ifdef CONFIG_BLOCK
5e605b64
JA		 1026 {
1027 .ctl_name = CTL_UNNUMBERED,
1028 .procname = "blk_iopoll",
1029 .data = &blk_iopoll_enabled,
1030 .maxlen = sizeof(int),
1031 .mode = 0644,
1032 .proc_handler = &proc_dointvec,
1033 },
cb684b5b 1034#endif
ed2c12f3
AM		 1035/*
1036 * NOTE: do not add new entries to this table unless you have read
1037 * Documentation/sysctl/ctl_unnumbered.txt
1038 */
1da177e4
LT		 1039 { .ctl_name = 0 }
1040};
1041
d8217f07 1042static struct ctl_table vm_table[] = {
1da177e4
LT		 1043 {
1044 .ctl_name = VM_OVERCOMMIT_MEMORY,
1045 .procname = "overcommit_memory",
1046 .data = &sysctl_overcommit_memory,
1047 .maxlen = sizeof(sysctl_overcommit_memory),
1048 .mode = 0644,
1049 .proc_handler = &proc_dointvec,
1050 },
fadd8fbd
KH		 1051 {
1052 .ctl_name = VM_PANIC_ON_OOM,
1053 .procname = "panic_on_oom",
1054 .data = &sysctl_panic_on_oom,
1055 .maxlen = sizeof(sysctl_panic_on_oom),
1056 .mode = 0644,
1057 .proc_handler = &proc_dointvec,
1058 },
fe071d7e
DR		 1059 {
1060 .ctl_name = CTL_UNNUMBERED,
1061 .procname = "oom_kill_allocating_task",
1062 .data = &sysctl_oom_kill_allocating_task,
1063 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1064 .mode = 0644,
1065 .proc_handler = &proc_dointvec,
1066 },
fef1bdd6
DR		 1067 {
1068 .ctl_name = CTL_UNNUMBERED,
1069 .procname = "oom_dump_tasks",
1070 .data = &sysctl_oom_dump_tasks,
1071 .maxlen = sizeof(sysctl_oom_dump_tasks),
1072 .mode = 0644,
1073 .proc_handler = &proc_dointvec,
1074 },
1da177e4
LT		 1075 {
1076 .ctl_name = VM_OVERCOMMIT_RATIO,
1077 .procname = "overcommit_ratio",
1078 .data = &sysctl_overcommit_ratio,
1079 .maxlen = sizeof(sysctl_overcommit_ratio),
1080 .mode = 0644,
1081 .proc_handler = &proc_dointvec,
1082 },
1083 {
1084 .ctl_name = VM_PAGE_CLUSTER,
1085 .procname = "page-cluster",
1086 .data = &page_cluster,
1087 .maxlen = sizeof(int),
1088 .mode = 0644,
1089 .proc_handler = &proc_dointvec,
1090 },
1091 {
1092 .ctl_name = VM_DIRTY_BACKGROUND,
1093 .procname = "dirty_background_ratio",
1094 .data = &dirty_background_ratio,
1095 .maxlen = sizeof(dirty_background_ratio),
1096 .mode = 0644,
2da02997 1097 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 1098 .strategy = &sysctl_intvec,
1099 .extra1 = &zero,
1100 .extra2 = &one_hundred,
1101 },
2da02997
DR		 1102 {
1103 .ctl_name = CTL_UNNUMBERED,
1104 .procname = "dirty_background_bytes",
1105 .data = &dirty_background_bytes,
1106 .maxlen = sizeof(dirty_background_bytes),
1107 .mode = 0644,
1108 .proc_handler = &dirty_background_bytes_handler,
1109 .strategy = &sysctl_intvec,
fc3501d4 1110 .extra1 = &one_ul,
2da02997 1111 },
1da177e4
LT		 1112 {
1113 .ctl_name = VM_DIRTY_RATIO,
1114 .procname = "dirty_ratio",
1115 .data = &vm_dirty_ratio,
1116 .maxlen = sizeof(vm_dirty_ratio),
1117 .mode = 0644,
04fbfdc1 1118 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1119 .strategy = &sysctl_intvec,
1120 .extra1 = &zero,
1121 .extra2 = &one_hundred,
1122 },
2da02997
DR		 1123 {
1124 .ctl_name = CTL_UNNUMBERED,
1125 .procname = "dirty_bytes",
1126 .data = &vm_dirty_bytes,
1127 .maxlen = sizeof(vm_dirty_bytes),
1128 .mode = 0644,
1129 .proc_handler = &dirty_bytes_handler,
1130 .strategy = &sysctl_intvec,
9e4a5bda 1131 .extra1 = &dirty_bytes_min,
2da02997 1132 },
1da177e4 1133 {
1da177e4 1134 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1135 .data = &dirty_writeback_interval,
1136 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1137 .mode = 0644,
1138 .proc_handler = &dirty_writeback_centisecs_handler,
1139 },
1140 {
1da177e4 1141 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1142 .data = &dirty_expire_interval,
1143 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1144 .mode = 0644,
704503d8 1145 .proc_handler = &proc_dointvec,
1da177e4
LT		 1146 },
1147 {
1148 .ctl_name = VM_NR_PDFLUSH_THREADS,
1149 .procname = "nr_pdflush_threads",
1150 .data = &nr_pdflush_threads,
1151 .maxlen = sizeof nr_pdflush_threads,
1152 .mode = 0444 /* read-only*/,
1153 .proc_handler = &proc_dointvec,
1154 },
1155 {
1156 .ctl_name = VM_SWAPPINESS,
1157 .procname = "swappiness",
1158 .data = &vm_swappiness,
1159 .maxlen = sizeof(vm_swappiness),
1160 .mode = 0644,
1161 .proc_handler = &proc_dointvec_minmax,
1162 .strategy = &sysctl_intvec,
1163 .extra1 = &zero,
1164 .extra2 = &one_hundred,
1165 },
1166#ifdef CONFIG_HUGETLB_PAGE
1167 {
1da177e4 1168 .procname = "nr_hugepages",
e5ff2159 1169 .data = NULL,
1da177e4
LT		 1170 .maxlen = sizeof(unsigned long),
1171 .mode = 0644,
1172 .proc_handler = &hugetlb_sysctl_handler,
1173 .extra1 = (void *)&hugetlb_zero,
1174 .extra2 = (void *)&hugetlb_infinity,
1175 },
1176 {
1177 .ctl_name = VM_HUGETLB_GROUP,
1178 .procname = "hugetlb_shm_group",
1179 .data = &sysctl_hugetlb_shm_group,
1180 .maxlen = sizeof(gid_t),
1181 .mode = 0644,
1182 .proc_handler = &proc_dointvec,
1183 },
396faf03
MG		 1184 {
1185 .ctl_name = CTL_UNNUMBERED,
1186 .procname = "hugepages_treat_as_movable",
1187 .data = &hugepages_treat_as_movable,
1188 .maxlen = sizeof(int),
1189 .mode = 0644,
1190 .proc_handler = &hugetlb_treat_movable_handler,
1191 },
d1c3fb1f
NA		 1192 {
1193 .ctl_name = CTL_UNNUMBERED,
1194 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1195 .data = NULL,
1196 .maxlen = sizeof(unsigned long),
d1c3fb1f 1197 .mode = 0644,
a3d0c6aa 1198 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1199 .extra1 = (void *)&hugetlb_zero,
1200 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1201 },
1da177e4
LT		 1202#endif
1203 {
1204 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1205 .procname = "lowmem_reserve_ratio",
1206 .data = &sysctl_lowmem_reserve_ratio,
1207 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1208 .mode = 0644,
1209 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1210 .strategy = &sysctl_intvec,
1211 },
9d0243bc
AM		 1212 {
1213 .ctl_name = VM_DROP_PAGECACHE,
1214 .procname = "drop_caches",
1215 .data = &sysctl_drop_caches,
1216 .maxlen = sizeof(int),
1217 .mode = 0644,
1218 .proc_handler = drop_caches_sysctl_handler,
1219 .strategy = &sysctl_intvec,
1220 },
1da177e4
LT		 1221 {
1222 .ctl_name = VM_MIN_FREE_KBYTES,
1223 .procname = "min_free_kbytes",
1224 .data = &min_free_kbytes,
1225 .maxlen = sizeof(min_free_kbytes),
1226 .mode = 0644,
1227 .proc_handler = &min_free_kbytes_sysctl_handler,
1228 .strategy = &sysctl_intvec,
1229 .extra1 = &zero,
1230 },
8ad4b1fb
RS		 1231 {
1232 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1233 .procname = "percpu_pagelist_fraction",
1234 .data = &percpu_pagelist_fraction,
1235 .maxlen = sizeof(percpu_pagelist_fraction),
1236 .mode = 0644,
1237 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1238 .strategy = &sysctl_intvec,
1239 .extra1 = &min_percpu_pagelist_fract,
1240 },
1da177e4
LT		 1241#ifdef CONFIG_MMU
1242 {
1243 .ctl_name = VM_MAX_MAP_COUNT,
1244 .procname = "max_map_count",
1245 .data = &sysctl_max_map_count,
1246 .maxlen = sizeof(sysctl_max_map_count),
1247 .mode = 0644,
1248 .proc_handler = &proc_dointvec
1249 },
dd8632a1
PM		 1250#else
1251 {
1252 .ctl_name = CTL_UNNUMBERED,
1253 .procname = "nr_trim_pages",
1254 .data = &sysctl_nr_trim_pages,
1255 .maxlen = sizeof(sysctl_nr_trim_pages),
1256 .mode = 0644,
1257 .proc_handler = &proc_dointvec_minmax,
1258 .strategy = &sysctl_intvec,
1259 .extra1 = &zero,
1260 },
1da177e4
LT		 1261#endif
1262 {
1263 .ctl_name = VM_LAPTOP_MODE,
1264 .procname = "laptop_mode",
1265 .data = &laptop_mode,
1266 .maxlen = sizeof(laptop_mode),
1267 .mode = 0644,
ed5b43f1
BS		 1268 .proc_handler = &proc_dointvec_jiffies,
1269 .strategy = &sysctl_jiffies,
1da177e4
LT		 1270 },
1271 {
1272 .ctl_name = VM_BLOCK_DUMP,
1273 .procname = "block_dump",
1274 .data = &block_dump,
1275 .maxlen = sizeof(block_dump),
1276 .mode = 0644,
1277 .proc_handler = &proc_dointvec,
1278 .strategy = &sysctl_intvec,
1279 .extra1 = &zero,
1280 },
1281 {
1282 .ctl_name = VM_VFS_CACHE_PRESSURE,
1283 .procname = "vfs_cache_pressure",
1284 .data = &sysctl_vfs_cache_pressure,
1285 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1286 .mode = 0644,
1287 .proc_handler = &proc_dointvec,
1288 .strategy = &sysctl_intvec,
1289 .extra1 = &zero,
1290 },
1291#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1292 {
1293 .ctl_name = VM_LEGACY_VA_LAYOUT,
1294 .procname = "legacy_va_layout",
1295 .data = &sysctl_legacy_va_layout,
1296 .maxlen = sizeof(sysctl_legacy_va_layout),
1297 .mode = 0644,
1298 .proc_handler = &proc_dointvec,
1299 .strategy = &sysctl_intvec,
1300 .extra1 = &zero,
1301 },
1302#endif
1743660b
CL		 1303#ifdef CONFIG_NUMA
1304 {
1305 .ctl_name = VM_ZONE_RECLAIM_MODE,
1306 .procname = "zone_reclaim_mode",
1307 .data = &zone_reclaim_mode,
1308 .maxlen = sizeof(zone_reclaim_mode),
1309 .mode = 0644,
1310 .proc_handler = &proc_dointvec,
c84db23c
CL		 1311 .strategy = &sysctl_intvec,
1312 .extra1 = &zero,
1743660b 1313 },
9614634f
CL		 1314 {
1315 .ctl_name = VM_MIN_UNMAPPED,
1316 .procname = "min_unmapped_ratio",
1317 .data = &sysctl_min_unmapped_ratio,
1318 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1319 .mode = 0644,
1320 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1321 .strategy = &sysctl_intvec,
1322 .extra1 = &zero,
1323 .extra2 = &one_hundred,
1324 },
0ff38490
CL		 1325 {
1326 .ctl_name = VM_MIN_SLAB,
1327 .procname = "min_slab_ratio",
1328 .data = &sysctl_min_slab_ratio,
1329 .maxlen = sizeof(sysctl_min_slab_ratio),
1330 .mode = 0644,
1331 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1332 .strategy = &sysctl_intvec,
1333 .extra1 = &zero,
1334 .extra2 = &one_hundred,
1335 },
e6e5494c 1336#endif
77461ab3
CL		 1337#ifdef CONFIG_SMP
1338 {
1339 .ctl_name = CTL_UNNUMBERED,
1340 .procname = "stat_interval",
1341 .data = &sysctl_stat_interval,
1342 .maxlen = sizeof(sysctl_stat_interval),
1343 .mode = 0644,
1344 .proc_handler = &proc_dointvec_jiffies,
1345 .strategy = &sysctl_jiffies,
1346 },
1347#endif
ed032189
EP		 1348 {
1349 .ctl_name = CTL_UNNUMBERED,
1350 .procname = "mmap_min_addr",
788084ab
EP		 1351 .data = &dac_mmap_min_addr,
1352 .maxlen = sizeof(unsigned long),
ed032189 1353 .mode = 0644,
788084ab 1354 .proc_handler = &mmap_min_addr_handler,
ed032189 1355 },
f0c0b2b8
KH		 1356#ifdef CONFIG_NUMA
1357 {
1358 .ctl_name = CTL_UNNUMBERED,
1359 .procname = "numa_zonelist_order",
1360 .data = &numa_zonelist_order,
1361 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1362 .mode = 0644,
1363 .proc_handler = &numa_zonelist_order_handler,
1364 .strategy = &sysctl_string,
1365 },
1366#endif
2b8232ce 1367#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1368 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1369 {
1370 .ctl_name = VM_VDSO_ENABLED,
1371 .procname = "vdso_enabled",
1372 .data = &vdso_enabled,
1373 .maxlen = sizeof(vdso_enabled),
1374 .mode = 0644,
1375 .proc_handler = &proc_dointvec,
1376 .strategy = &sysctl_intvec,
1377 .extra1 = &zero,
1378 },
1da177e4 1379#endif
195cf453
BG		 1380#ifdef CONFIG_HIGHMEM
1381 {
1382 .ctl_name = CTL_UNNUMBERED,
1383 .procname = "highmem_is_dirtyable",
1384 .data = &vm_highmem_is_dirtyable,
1385 .maxlen = sizeof(vm_highmem_is_dirtyable),
1386 .mode = 0644,
1387 .proc_handler = &proc_dointvec_minmax,
1388 .strategy = &sysctl_intvec,
1389 .extra1 = &zero,
1390 .extra2 = &one,
1391 },
1392#endif
4be6f6bb
PZ		 1393 {
1394 .ctl_name = CTL_UNNUMBERED,
1395 .procname = "scan_unevictable_pages",
1396 .data = &scan_unevictable_pages,
1397 .maxlen = sizeof(scan_unevictable_pages),
1398 .mode = 0644,
1399 .proc_handler = &scan_unevictable_handler,
1400 },
6a46079c
AK		 1401#ifdef CONFIG_MEMORY_FAILURE
1402 {
1403 .ctl_name = CTL_UNNUMBERED,
1404 .procname = "memory_failure_early_kill",
1405 .data = &sysctl_memory_failure_early_kill,
1406 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1407 .mode = 0644,
1408 .proc_handler = &proc_dointvec_minmax,
1409 .strategy = &sysctl_intvec,
1410 .extra1 = &zero,
1411 .extra2 = &one,
1412 },
1413 {
1414 .ctl_name = CTL_UNNUMBERED,
1415 .procname = "memory_failure_recovery",
1416 .data = &sysctl_memory_failure_recovery,
1417 .maxlen = sizeof(sysctl_memory_failure_recovery),
1418 .mode = 0644,
1419 .proc_handler = &proc_dointvec_minmax,
1420 .strategy = &sysctl_intvec,
1421 .extra1 = &zero,
1422 .extra2 = &one,
1423 },
1424#endif
1425
2be7fe07
AM		 1426/*
1427 * NOTE: do not add new entries to this table unless you have read
1428 * Documentation/sysctl/ctl_unnumbered.txt
1429 */
1da177e4
LT		 1430 { .ctl_name = 0 }
1431};
1432
2abc26fc 1433#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1434static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1435 { .ctl_name = 0 }
1436};
1437#endif
1438
d8217f07 1439static struct ctl_table fs_table[] = {
1da177e4
LT		 1440 {
1441 .ctl_name = FS_NRINODE,
1442 .procname = "inode-nr",
1443 .data = &inodes_stat,
1444 .maxlen = 2*sizeof(int),
1445 .mode = 0444,
1446 .proc_handler = &proc_dointvec,
1447 },
1448 {
1449 .ctl_name = FS_STATINODE,
1450 .procname = "inode-state",
1451 .data = &inodes_stat,
1452 .maxlen = 7*sizeof(int),
1453 .mode = 0444,
1454 .proc_handler = &proc_dointvec,
1455 },
1456 {
1da177e4
LT		 1457 .procname = "file-nr",
1458 .data = &files_stat,
1459 .maxlen = 3*sizeof(int),
1460 .mode = 0444,
529bf6be 1461 .proc_handler = &proc_nr_files,
1da177e4
LT		 1462 },
1463 {
1464 .ctl_name = FS_MAXFILE,
1465 .procname = "file-max",
1466 .data = &files_stat.max_files,
1467 .maxlen = sizeof(int),
1468 .mode = 0644,
1469 .proc_handler = &proc_dointvec,
1470 },
9cfe015a
ED		 1471 {
1472 .ctl_name = CTL_UNNUMBERED,
1473 .procname = "nr_open",
1474 .data = &sysctl_nr_open,
1475 .maxlen = sizeof(int),
1476 .mode = 0644,
eceea0b3
AV		 1477 .proc_handler = &proc_dointvec_minmax,
1478 .extra1 = &sysctl_nr_open_min,
1479 .extra2 = &sysctl_nr_open_max,
9cfe015a 1480 },
1da177e4
LT		 1481 {
1482 .ctl_name = FS_DENTRY,
1483 .procname = "dentry-state",
1484 .data = &dentry_stat,
1485 .maxlen = 6*sizeof(int),
1486 .mode = 0444,
1487 .proc_handler = &proc_dointvec,
1488 },
1489 {
1490 .ctl_name = FS_OVERFLOWUID,
1491 .procname = "overflowuid",
1492 .data = &fs_overflowuid,
1493 .maxlen = sizeof(int),
1494 .mode = 0644,
1495 .proc_handler = &proc_dointvec_minmax,
1496 .strategy = &sysctl_intvec,
1497 .extra1 = &minolduid,
1498 .extra2 = &maxolduid,
1499 },
1500 {
1501 .ctl_name = FS_OVERFLOWGID,
1502 .procname = "overflowgid",
1503 .data = &fs_overflowgid,
1504 .maxlen = sizeof(int),
1505 .mode = 0644,
1506 .proc_handler = &proc_dointvec_minmax,
1507 .strategy = &sysctl_intvec,
1508 .extra1 = &minolduid,
1509 .extra2 = &maxolduid,
1510 },
bfcd17a6 1511#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1512 {
1513 .ctl_name = FS_LEASES,
1514 .procname = "leases-enable",
1515 .data = &leases_enable,
1516 .maxlen = sizeof(int),
1517 .mode = 0644,
1518 .proc_handler = &proc_dointvec,
1519 },
bfcd17a6 1520#endif
1da177e4
LT		 1521#ifdef CONFIG_DNOTIFY
1522 {
1523 .ctl_name = FS_DIR_NOTIFY,
1524 .procname = "dir-notify-enable",
1525 .data = &dir_notify_enable,
1526 .maxlen = sizeof(int),
1527 .mode = 0644,
1528 .proc_handler = &proc_dointvec,
1529 },
1530#endif
1531#ifdef CONFIG_MMU
bfcd17a6 1532#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1533 {
1534 .ctl_name = FS_LEASE_TIME,
1535 .procname = "lease-break-time",
1536 .data = &lease_break_time,
1537 .maxlen = sizeof(int),
1538 .mode = 0644,
8e654fba 1539 .proc_handler = &proc_dointvec,
1da177e4 1540 },
bfcd17a6 1541#endif
ebf3f09c 1542#ifdef CONFIG_AIO
1da177e4 1543 {
1da177e4
LT		 1544 .procname = "aio-nr",
1545 .data = &aio_nr,
1546 .maxlen = sizeof(aio_nr),
1547 .mode = 0444,
d55b5fda 1548 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1549 },
1550 {
1da177e4
LT		 1551 .procname = "aio-max-nr",
1552 .data = &aio_max_nr,
1553 .maxlen = sizeof(aio_max_nr),
1554 .mode = 0644,
d55b5fda 1555 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1556 },
ebf3f09c 1557#endif /* CONFIG_AIO */
2d9048e2 1558#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1559 {
1560 .ctl_name = FS_INOTIFY,
1561 .procname = "inotify",
1562 .mode = 0555,
1563 .child = inotify_table,
1564 },
1565#endif
7ef9964e
DL		 1566#ifdef CONFIG_EPOLL
1567 {
1568 .procname = "epoll",
1569 .mode = 0555,
1570 .child = epoll_table,
1571 },
1572#endif
1da177e4 1573#endif
d6e71144
AC		 1574 {
1575 .ctl_name = KERN_SETUID_DUMPABLE,
1576 .procname = "suid_dumpable",
1577 .data = &suid_dumpable,
1578 .maxlen = sizeof(int),
1579 .mode = 0644,
8e654fba
MW		 1580 .proc_handler = &proc_dointvec_minmax,
1581 .strategy = &sysctl_intvec,
1582 .extra1 = &zero,
1583 .extra2 = &two,
d6e71144 1584 },
2abc26fc
EB		 1585#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1586 {
1587 .ctl_name = CTL_UNNUMBERED,
1588 .procname = "binfmt_misc",
1589 .mode = 0555,
1590 .child = binfmt_misc_table,
1591 },
1592#endif
2be7fe07
AM		 1593/*
1594 * NOTE: do not add new entries to this table unless you have read
1595 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1596 */
1da177e4
LT		 1597 { .ctl_name = 0 }
1598};
1599
d8217f07 1600static struct ctl_table debug_table[] = {
d0c3d534 1601#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1602 {
1603 .ctl_name = CTL_UNNUMBERED,
1604 .procname = "exception-trace",
1605 .data = &show_unhandled_signals,
1606 .maxlen = sizeof(int),
1607 .mode = 0644,
1608 .proc_handler = proc_dointvec
1609 },
1610#endif
1da177e4
LT		 1611 { .ctl_name = 0 }
1612};
1613
d8217f07 1614static struct ctl_table dev_table[] = {
1da177e4 1615 { .ctl_name = 0 }
0eeca283 1616};
1da177e4 1617
330d57fb
AV		 1618static DEFINE_SPINLOCK(sysctl_lock);
1619
1620/* called under sysctl_lock */
1621static int use_table(struct ctl_table_header *p)
1622{
1623 if (unlikely(p->unregistering))
1624 return 0;
1625 p->used++;
1626 return 1;
1627}
1628
1629/* called under sysctl_lock */
1630static void unuse_table(struct ctl_table_header *p)
1631{
1632 if (!--p->used)
1633 if (unlikely(p->unregistering))
1634 complete(p->unregistering);
1635}
1636
1637/* called under sysctl_lock, will reacquire if has to wait */
1638static void start_unregistering(struct ctl_table_header *p)
1639{
1640 /*
1641 * if p->used is 0, nobody will ever touch that entry again;
1642 * we'll eliminate all paths to it before dropping sysctl_lock
1643 */
1644 if (unlikely(p->used)) {
1645 struct completion wait;
1646 init_completion(&wait);
1647 p->unregistering = &wait;
1648 spin_unlock(&sysctl_lock);
1649 wait_for_completion(&wait);
1650 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1651 } else {
1652 /* anything non-NULL; we'll never dereference it */
1653 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1654 }
1655 /*
1656 * do not remove from the list until nobody holds it; walking the
1657 * list in do_sysctl() relies on that.
1658 */
1659 list_del_init(&p->ctl_entry);
1660}
1661
f7e6ced4
AV		 1662void sysctl_head_get(struct ctl_table_header *head)
1663{
1664 spin_lock(&sysctl_lock);
1665 head->count++;
1666 spin_unlock(&sysctl_lock);
1667}
1668
1669void sysctl_head_put(struct ctl_table_header *head)
1670{
1671 spin_lock(&sysctl_lock);
1672 if (!--head->count)
1673 kfree(head);
1674 spin_unlock(&sysctl_lock);
1675}
1676
1677struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1678{
1679 if (!head)
1680 BUG();
1681 spin_lock(&sysctl_lock);
1682 if (!use_table(head))
1683 head = ERR_PTR(-ENOENT);
1684 spin_unlock(&sysctl_lock);
1685 return head;
1686}
1687
805b5d5e
EB		 1688void sysctl_head_finish(struct ctl_table_header *head)
1689{
1690 if (!head)
1691 return;
1692 spin_lock(&sysctl_lock);
1693 unuse_table(head);
1694 spin_unlock(&sysctl_lock);
1695}
1696
73455092
AV		 1697static struct ctl_table_set *
1698lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1699{
1700 struct ctl_table_set *set = &root->default_set;
1701 if (root->lookup)
1702 set = root->lookup(root, namespaces);
1703 return set;
1704}
1705
e51b6ba0
EB		 1706static struct list_head *
1707lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1708{
73455092
AV		 1709 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1710 return &set->list;
e51b6ba0
EB		 1711}
1712
1713struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1714 struct ctl_table_header *prev)
1715{
1716 struct ctl_table_root *root;
1717 struct list_head *header_list;
805b5d5e
EB		 1718 struct ctl_table_header *head;
1719 struct list_head *tmp;
e51b6ba0 1720
805b5d5e
EB		 1721 spin_lock(&sysctl_lock);
1722 if (prev) {
e51b6ba0 1723 head = prev;
805b5d5e
EB		 1724 tmp = &prev->ctl_entry;
1725 unuse_table(prev);
1726 goto next;
1727 }
1728 tmp = &root_table_header.ctl_entry;
1729 for (;;) {
1730 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1731
1732 if (!use_table(head))
1733 goto next;
1734 spin_unlock(&sysctl_lock);
1735 return head;
1736 next:
e51b6ba0 1737 root = head->root;
805b5d5e 1738 tmp = tmp->next;
e51b6ba0
EB		 1739 header_list = lookup_header_list(root, namespaces);
1740 if (tmp != header_list)
1741 continue;
1742
1743 do {
1744 root = list_entry(root->root_list.next,
1745 struct ctl_table_root, root_list);
1746 if (root == &sysctl_table_root)
1747 goto out;
1748 header_list = lookup_header_list(root, namespaces);
1749 } while (list_empty(header_list));
1750 tmp = header_list->next;
805b5d5e 1751 }
e51b6ba0 1752out:
805b5d5e
EB		 1753 spin_unlock(&sysctl_lock);
1754 return NULL;
1755}
1756
e51b6ba0
EB		 1757struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1758{
1759 return __sysctl_head_next(current->nsproxy, prev);
1760}
1761
1762void register_sysctl_root(struct ctl_table_root *root)
1763{
1764 spin_lock(&sysctl_lock);
1765 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1766 spin_unlock(&sysctl_lock);
1767}
1768
b89a8171 1769#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1770/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1771static int do_sysctl_strategy(struct ctl_table_root *root,
1772 struct ctl_table *table,
2c4c7155
PE		 1773 void __user *oldval, size_t __user *oldlenp,
1774 void __user *newval, size_t newlen)
1775{
1776 int op = 0, rc;
1777
1778 if (oldval)
e6305c43 1779 op |= MAY_READ;
2c4c7155 1780 if (newval)
e6305c43 1781 op |= MAY_WRITE;
d7321cd6 1782 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1783 return -EPERM;
1784
1785 if (table->strategy) {
f221e726 1786 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1787 if (rc < 0)
1788 return rc;
1789 if (rc > 0)
1790 return 0;
1791 }
1792
1793 /* If there is no strategy routine, or if the strategy returns
1794 * zero, proceed with automatic r/w */
1795 if (table->data && table->maxlen) {
f221e726 1796 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1797 if (rc < 0)
1798 return rc;
1799 }
1800 return 0;
1801}
1802
1803static int parse_table(int __user *name, int nlen,
1804 void __user *oldval, size_t __user *oldlenp,
1805 void __user *newval, size_t newlen,
d7321cd6 1806 struct ctl_table_root *root,
2c4c7155
PE		 1807 struct ctl_table *table)
1808{
1809 int n;
1810repeat:
1811 if (!nlen)
1812 return -ENOTDIR;
1813 if (get_user(n, name))
1814 return -EFAULT;
1815 for ( ; table->ctl_name || table->procname; table++) {
1816 if (!table->ctl_name)
1817 continue;
1818 if (n == table->ctl_name) {
1819 int error;
1820 if (table->child) {
e6305c43 1821 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1822 return -EPERM;
1823 name++;
1824 nlen--;
1825 table = table->child;
1826 goto repeat;
1827 }
f221e726 1828 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1829 oldval, oldlenp,
1830 newval, newlen);
1831 return error;
1832 }
1833 }
1834 return -ENOTDIR;
1835}
1836
1da177e4
LT		 1837int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1838 void __user *newval, size_t newlen)
1839{
805b5d5e 1840 struct ctl_table_header *head;
330d57fb 1841 int error = -ENOTDIR;
1da177e4
LT		 1842
1843 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1844 return -ENOTDIR;
1845 if (oldval) {
1846 int old_len;
1847 if (!oldlenp || get_user(old_len, oldlenp))
1848 return -EFAULT;
1849 }
330d57fb 1850
805b5d5e
EB		 1851 for (head = sysctl_head_next(NULL); head;
1852 head = sysctl_head_next(head)) {
330d57fb 1853 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1854 newval, newlen,
1855 head->root, head->ctl_table);
805b5d5e
EB		 1856 if (error != -ENOTDIR) {
1857 sysctl_head_finish(head);
330d57fb 1858 break;
805b5d5e
EB		 1859 }
1860 }
330d57fb 1861 return error;
1da177e4
LT		 1862}
1863
1e7bfb21 1864SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1865{
1866 struct __sysctl_args tmp;
1867 int error;
1868
1869 if (copy_from_user(&tmp, args, sizeof(tmp)))
1870 return -EFAULT;
1871
7058cb02
EB		 1872 error = deprecated_sysctl_warning(&tmp);
1873 if (error)
1874 goto out;
1875
1da177e4
LT		 1876 lock_kernel();
1877 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1878 tmp.newval, tmp.newlen);
1879 unlock_kernel();
7058cb02 1880out:
1da177e4
LT		 1881 return error;
1882}
b89a8171 1883#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1884
1885/*
1ff007eb 1886 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1887 * some sysctl variables are readonly even to root.
1888 */
1889
1890static int test_perm(int mode, int op)
1891{
76aac0e9 1892 if (!current_euid())
1da177e4
LT		 1893 mode >>= 6;
1894 else if (in_egroup_p(0))
1895 mode >>= 3;
e6305c43 1896 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1897 return 0;
1898 return -EACCES;
1899}
1900
d7321cd6 1901int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1902{
1903 int error;
d7321cd6
PE		 1904 int mode;
1905
e6305c43 1906 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1907 if (error)
1908 return error;
d7321cd6
PE		 1909
1910 if (root->permissions)
1911 mode = root->permissions(root, current->nsproxy, table);
1912 else
1913 mode = table->mode;
1914
1915 return test_perm(mode, op);
1da177e4
LT		 1916}
1917
d912b0cc
EB		 1918static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1919{
1920 for (; table->ctl_name || table->procname; table++) {
1921 table->parent = parent;
1922 if (table->child)
1923 sysctl_set_parent(table, table->child);
1924 }
1925}
1926
1927static __init int sysctl_init(void)
1928{
1929 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1930#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1931 {
1932 int err;
1933 err = sysctl_check_table(current->nsproxy, root_table);
1934 }
1935#endif
d912b0cc
EB		 1936 return 0;
1937}
1938
1939core_initcall(sysctl_init);
1940
bfbcf034
AV		 1941static struct ctl_table *is_branch_in(struct ctl_table *branch,
1942 struct ctl_table *table)
ae7edecc
AV		 1943{
1944 struct ctl_table *p;
1945 const char *s = branch->procname;
1946
1947 /* branch should have named subdirectory as its first element */
1948 if (!s || !branch->child)
bfbcf034 1949 return NULL;
ae7edecc
AV		 1950
1951 /* ... and nothing else */
1952 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1953 return NULL;
ae7edecc
AV		 1954
1955 /* table should contain subdirectory with the same name */
1956 for (p = table; p->procname || p->ctl_name; p++) {
1957 if (!p->child)
1958 continue;
1959 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1960 return p;
ae7edecc 1961 }
bfbcf034 1962 return NULL;
ae7edecc
AV		 1963}
1964
1965/* see if attaching q to p would be an improvement */
1966static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1967{
1968 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1969 struct ctl_table *next;
ae7edecc
AV		 1970 int is_better = 0;
1971 int not_in_parent = !p->attached_by;
1972
bfbcf034 1973 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1974 if (by == q->attached_by)
1975 is_better = 1;
1976 if (to == p->attached_by)
1977 not_in_parent = 1;
1978 by = by->child;
bfbcf034 1979 to = next->child;
ae7edecc
AV		 1980 }
1981
1982 if (is_better && not_in_parent) {
1983 q->attached_by = by;
1984 q->attached_to = to;
1985 q->parent = p;
1986 }
1987}
1988
1da177e4 1989/**
e51b6ba0
EB		 1990 * __register_sysctl_paths - register a sysctl hierarchy
1991 * @root: List of sysctl headers to register on
1992 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1993 * @path: The path to the directory the sysctl table is in.
1da177e4 1994 * @table: the top-level table structure
1da177e4
LT		 1995 *
1996 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1997 * array. A completely 0 filled entry terminates the table.
1da177e4 1998 *
d8217f07 1999 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 2000 *
2001 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
2002 * must be unique within that level of sysctl
2003 *
2004 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
2005 * enter a sysctl file
2006 *
2007 * data - a pointer to data for use by proc_handler
2008 *
2009 * maxlen - the maximum size in bytes of the data
2010 *
2011 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
2012 *
2013 * child - a pointer to the child sysctl table if this entry is a directory, or
2014 * %NULL.
2015 *
2016 * proc_handler - the text handler routine (described below)
2017 *
2018 * strategy - the strategy routine (described below)
2019 *
2020 * de - for internal use by the sysctl routines
2021 *
2022 * extra1, extra2 - extra pointers usable by the proc handler routines
2023 *
2024 * Leaf nodes in the sysctl tree will be represented by a single file
2025 * under /proc; non-leaf nodes will be represented by directories.
2026 *
2027 * sysctl(2) can automatically manage read and write requests through
2028 * the sysctl table. The data and maxlen fields of the ctl_table
2029 * struct enable minimal validation of the values being written to be
2030 * performed, and the mode field allows minimal authentication.
2031 *
2032 * More sophisticated management can be enabled by the provision of a
2033 * strategy routine with the table entry. This will be called before
2034 * any automatic read or write of the data is performed.
2035 *
2036 * The strategy routine may return
2037 *
2038 * < 0 - Error occurred (error is passed to user process)
2039 *
2040 * 0 - OK - proceed with automatic read or write.
2041 *
2042 * > 0 - OK - read or write has been done by the strategy routine, so
2043 * return immediately.
2044 *
2045 * There must be a proc_handler routine for any terminal nodes
2046 * mirrored under /proc/sys (non-terminals are handled by a built-in
2047 * directory handler). Several default handlers are available to
2048 * cover common cases -
2049 *
2050 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
2051 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
2052 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
2053 *
2054 * It is the handler's job to read the input buffer from user memory
2055 * and process it. The handler should return 0 on success.
2056 *
2057 * This routine returns %NULL on a failure to register, and a pointer
2058 * to the table header on success.
2059 */
e51b6ba0
EB		 2060struct ctl_table_header *__register_sysctl_paths(
2061 struct ctl_table_root *root,
2062 struct nsproxy *namespaces,
2063 const struct ctl_path *path, struct ctl_table *table)
1da177e4 2064{
29e796fd
EB		 2065 struct ctl_table_header *header;
2066 struct ctl_table *new, **prevp;
2067 unsigned int n, npath;
ae7edecc 2068 struct ctl_table_set *set;
29e796fd
EB		 2069
2070 /* Count the path components */
2071 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
2072 ;
2073
2074 /*
2075 * For each path component, allocate a 2-element ctl_table array.
2076 * The first array element will be filled with the sysctl entry
2077 * for this, the second will be the sentinel (ctl_name == 0).
2078 *
2079 * We allocate everything in one go so that we don't have to
2080 * worry about freeing additional memory in unregister_sysctl_table.
2081 */
2082 header = kzalloc(sizeof(struct ctl_table_header) +
2083 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
2084 if (!header)
1da177e4 2085 return NULL;
29e796fd
EB		 2086
2087 new = (struct ctl_table *) (header + 1);
2088
2089 /* Now connect the dots */
2090 prevp = &header->ctl_table;
2091 for (n = 0; n < npath; ++n, ++path) {
2092 /* Copy the procname */
2093 new->procname = path->procname;
2094 new->ctl_name = path->ctl_name;
2095 new->mode = 0555;
2096
2097 *prevp = new;
2098 prevp = &new->child;
2099
2100 new += 2;
2101 }
2102 *prevp = table;
23eb06de 2103 header->ctl_table_arg = table;
29e796fd
EB		 2104
2105 INIT_LIST_HEAD(&header->ctl_entry);
2106 header->used = 0;
2107 header->unregistering = NULL;
e51b6ba0 2108 header->root = root;
29e796fd 2109 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 2110 header->count = 1;
88f458e4 2111#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 2112 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 2113 kfree(header);
fc6cd25b
EB		 2114 return NULL;
2115 }
88f458e4 2116#endif
330d57fb 2117 spin_lock(&sysctl_lock);
73455092 2118 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 2119 header->attached_by = header->ctl_table;
2120 header->attached_to = root_table;
2121 header->parent = &root_table_header;
2122 for (set = header->set; set; set = set->parent) {
2123 struct ctl_table_header *p;
2124 list_for_each_entry(p, &set->list, ctl_entry) {
2125 if (p->unregistering)
2126 continue;
2127 try_attach(p, header);
2128 }
2129 }
2130 header->parent->count++;
73455092 2131 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 2132 spin_unlock(&sysctl_lock);
29e796fd
EB		 2133
2134 return header;
2135}
2136
e51b6ba0
EB		 2137/**
2138 * register_sysctl_table_path - register a sysctl table hierarchy
2139 * @path: The path to the directory the sysctl table is in.
2140 * @table: the top-level table structure
2141 *
2142 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2143 * array. A completely 0 filled entry terminates the table.
2144 *
2145 * See __register_sysctl_paths for more details.
2146 */
2147struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2148 struct ctl_table *table)
2149{
2150 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2151 path, table);
2152}
2153
29e796fd
EB		 2154/**
2155 * register_sysctl_table - register a sysctl table hierarchy
2156 * @table: the top-level table structure
2157 *
2158 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2159 * array. A completely 0 filled entry terminates the table.
2160 *
2161 * See register_sysctl_paths for more details.
2162 */
2163struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2164{
2165 static const struct ctl_path null_path[] = { {} };
2166
2167 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2168}
2169
2170/**
2171 * unregister_sysctl_table - unregister a sysctl table hierarchy
2172 * @header: the header returned from register_sysctl_table
2173 *
2174 * Unregisters the sysctl table and all children. proc entries may not
2175 * actually be removed until they are no longer used by anyone.
2176 */
2177void unregister_sysctl_table(struct ctl_table_header * header)
2178{
330d57fb 2179 might_sleep();
f1dad166
PE		 2180
2181 if (header == NULL)
2182 return;
2183
330d57fb
AV		 2184 spin_lock(&sysctl_lock);
2185 start_unregistering(header);
ae7edecc
AV		 2186 if (!--header->parent->count) {
2187 WARN_ON(1);
2188 kfree(header->parent);
2189 }
f7e6ced4
AV		 2190 if (!--header->count)
2191 kfree(header);
330d57fb 2192 spin_unlock(&sysctl_lock);
1da177e4
LT		 2193}
2194
9043476f
AV		 2195int sysctl_is_seen(struct ctl_table_header *p)
2196{
2197 struct ctl_table_set *set = p->set;
2198 int res;
2199 spin_lock(&sysctl_lock);
2200 if (p->unregistering)
2201 res = 0;
2202 else if (!set->is_seen)
2203 res = 1;
2204 else
2205 res = set->is_seen(set);
2206 spin_unlock(&sysctl_lock);
2207 return res;
2208}
2209
73455092
AV		 2210void setup_sysctl_set(struct ctl_table_set *p,
2211 struct ctl_table_set *parent,
2212 int (*is_seen)(struct ctl_table_set *))
2213{
2214 INIT_LIST_HEAD(&p->list);
2215 p->parent = parent ? parent : &sysctl_table_root.default_set;
2216 p->is_seen = is_seen;
2217}
2218
b89a8171 2219#else /* !CONFIG_SYSCTL */
d8217f07 2220struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2221{
2222 return NULL;
2223}
2224
29e796fd
EB		 2225struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2226 struct ctl_table *table)
2227{
2228 return NULL;
2229}
2230
b89a8171
EB		 2231void unregister_sysctl_table(struct ctl_table_header * table)
2232{
2233}
2234
73455092
AV		 2235void setup_sysctl_set(struct ctl_table_set *p,
2236 struct ctl_table_set *parent,
2237 int (*is_seen)(struct ctl_table_set *))
2238{
2239}
2240
f7e6ced4
AV		 2241void sysctl_head_put(struct ctl_table_header *head)
2242{
2243}
2244
b89a8171
EB		 2245#endif /* CONFIG_SYSCTL */
2246
1da177e4
LT		 2247/*
2248 * /proc/sys support
2249 */
2250
b89a8171 2251#ifdef CONFIG_PROC_SYSCTL
1da177e4 2252
b1ba4ddd 2253static int _proc_do_string(void* data, int maxlen, int write,
8d65af78 2254 void __user *buffer,
b1ba4ddd 2255 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2256{
2257 size_t len;
2258 char __user *p;
2259 char c;
8d060877
ON		 2260
2261 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2262 *lenp = 0;
2263 return 0;
2264 }
8d060877 2265
1da177e4
LT		 2266 if (write) {
2267 len = 0;
2268 p = buffer;
2269 while (len < *lenp) {
2270 if (get_user(c, p++))
2271 return -EFAULT;
2272 if (c == 0 || c == '\n')
2273 break;
2274 len++;
2275 }
f5dd3d6f
SV		 2276 if (len >= maxlen)
2277 len = maxlen-1;
2278 if(copy_from_user(data, buffer, len))
1da177e4 2279 return -EFAULT;
f5dd3d6f 2280 ((char *) data)[len] = 0;
1da177e4
LT		 2281 *ppos += *lenp;
2282 } else {
f5dd3d6f
SV		 2283 len = strlen(data);
2284 if (len > maxlen)
2285 len = maxlen;
8d060877
ON		 2286
2287 if (*ppos > len) {
2288 *lenp = 0;
2289 return 0;
2290 }
2291
2292 data += *ppos;
2293 len -= *ppos;
2294
1da177e4
LT		 2295 if (len > *lenp)
2296 len = *lenp;
2297 if (len)
f5dd3d6f 2298 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2299 return -EFAULT;
2300 if (len < *lenp) {
2301 if(put_user('\n', ((char __user *) buffer) + len))
2302 return -EFAULT;
2303 len++;
2304 }
2305 *lenp = len;
2306 *ppos += len;
2307 }
2308 return 0;
2309}
2310
f5dd3d6f
SV		 2311/**
2312 * proc_dostring - read a string sysctl
2313 * @table: the sysctl table
2314 * @write: %TRUE if this is a write to the sysctl file
f5dd3d6f
SV		 2315 * @buffer: the user buffer
2316 * @lenp: the size of the user buffer
2317 * @ppos: file position
2318 *
2319 * Reads/writes a string from/to the user buffer. If the kernel
2320 * buffer provided is not large enough to hold the string, the
2321 * string is truncated. The copied string is %NULL-terminated.
2322 * If the string is being read by the user process, it is copied
2323 * and a newline '\n' is added. It is truncated if the buffer is
2324 * not large enough.
2325 *
2326 * Returns 0 on success.
2327 */
8d65af78 2328int proc_dostring(struct ctl_table *table, int write,
f5dd3d6f
SV		 2329 void __user *buffer, size_t *lenp, loff_t *ppos)
2330{
8d65af78 2331 return _proc_do_string(table->data, table->maxlen, write,
f5dd3d6f
SV		 2332 buffer, lenp, ppos);
2333}
2334
1da177e4
LT		 2335
2336static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2337 int *valp,
2338 int write, void *data)
2339{
2340 if (write) {
2341 *valp = *negp ? -*lvalp : *lvalp;
2342 } else {
2343 int val = *valp;
2344 if (val < 0) {
2345 *negp = -1;
2346 *lvalp = (unsigned long)-val;
2347 } else {
2348 *negp = 0;
2349 *lvalp = (unsigned long)val;
2350 }
2351 }
2352 return 0;
2353}
2354
d8217f07 2355static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
8d65af78 2356 int write, void __user *buffer,
fcfbd547 2357 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2358 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2359 int write, void *data),
2360 void *data)
2361{
2362#define TMPBUFLEN 21
7338f299 2363 int *i, vleft, first = 1, neg;
1da177e4
LT		 2364 unsigned long lval;
2365 size_t left, len;
2366
2367 char buf[TMPBUFLEN], *p;
2368 char __user *s = buffer;
2369
fcfbd547 2370 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2371 (*ppos && !write)) {
2372 *lenp = 0;
2373 return 0;
2374 }
2375
fcfbd547 2376 i = (int *) tbl_data;
1da177e4
LT		 2377 vleft = table->maxlen / sizeof(*i);
2378 left = *lenp;
2379
2380 if (!conv)
2381 conv = do_proc_dointvec_conv;
2382
2383 for (; left && vleft--; i++, first=0) {
2384 if (write) {
2385 while (left) {
2386 char c;
2387 if (get_user(c, s))
2388 return -EFAULT;
2389 if (!isspace(c))
2390 break;
2391 left--;
2392 s++;
2393 }
2394 if (!left)
2395 break;
2396 neg = 0;
2397 len = left;
2398 if (len > sizeof(buf) - 1)
2399 len = sizeof(buf) - 1;
2400 if (copy_from_user(buf, s, len))
2401 return -EFAULT;
2402 buf[len] = 0;
2403 p = buf;
2404 if (*p == '-' && left > 1) {
2405 neg = 1;
bd9b0bac 2406 p++;
1da177e4
LT		 2407 }
2408 if (*p < '0' || *p > '9')
2409 break;
2410
2411 lval = simple_strtoul(p, &p, 0);
2412
2413 len = p-buf;
2414 if ((len < left) && *p && !isspace(*p))
2415 break;
1da177e4
LT		 2416 s += len;
2417 left -= len;
2418
2419 if (conv(&neg, &lval, i, 1, data))
2420 break;
2421 } else {
2422 p = buf;
2423 if (!first)
2424 *p++ = '\t';
2425
2426 if (conv(&neg, &lval, i, 0, data))
2427 break;
2428
2429 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2430 len = strlen(buf);
2431 if (len > left)
2432 len = left;
2433 if(copy_to_user(s, buf, len))
2434 return -EFAULT;
2435 left -= len;
2436 s += len;
2437 }
2438 }
2439
2440 if (!write && !first && left) {
2441 if(put_user('\n', s))
2442 return -EFAULT;
2443 left--, s++;
2444 }
2445 if (write) {
2446 while (left) {
2447 char c;
2448 if (get_user(c, s++))
2449 return -EFAULT;
2450 if (!isspace(c))
2451 break;
2452 left--;
2453 }
2454 }
2455 if (write && first)
2456 return -EINVAL;
2457 *lenp -= left;
2458 *ppos += *lenp;
2459 return 0;
2460#undef TMPBUFLEN
2461}
2462
8d65af78 2463static int do_proc_dointvec(struct ctl_table *table, int write,
fcfbd547
KK		 2464 void __user *buffer, size_t *lenp, loff_t *ppos,
2465 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2466 int write, void *data),
2467 void *data)
2468{
8d65af78 2469 return __do_proc_dointvec(table->data, table, write,
fcfbd547
KK		 2470 buffer, lenp, ppos, conv, data);
2471}
2472
1da177e4
LT		 2473/**
2474 * proc_dointvec - read a vector of integers
2475 * @table: the sysctl table
2476 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2477 * @buffer: the user buffer
2478 * @lenp: the size of the user buffer
2479 * @ppos: file position
2480 *
2481 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2482 * values from/to the user buffer, treated as an ASCII string.
2483 *
2484 * Returns 0 on success.
2485 */
8d65af78 2486int proc_dointvec(struct ctl_table *table, int write,
1da177e4
LT		 2487 void __user *buffer, size_t *lenp, loff_t *ppos)
2488{
8d65af78 2489 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2490 NULL,NULL);
2491}
2492
34f5a398 2493/*
25ddbb18
AK		 2494 * Taint values can only be increased
2495 * This means we can safely use a temporary.
34f5a398 2496 */
8d65af78 2497static int proc_taint(struct ctl_table *table, int write,
34f5a398
TT		 2498 void __user *buffer, size_t *lenp, loff_t *ppos)
2499{
25ddbb18
AK		 2500 struct ctl_table t;
2501 unsigned long tmptaint = get_taint();
2502 int err;
34f5a398 2503
91fcd412 2504 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2505 return -EPERM;
2506
25ddbb18
AK		 2507 t = *table;
2508 t.data = &tmptaint;
8d65af78 2509 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
25ddbb18
AK		 2510 if (err < 0)
2511 return err;
2512
2513 if (write) {
2514 /*
2515 * Poor man's atomic or. Not worth adding a primitive
2516 * to everyone's atomic.h for this
2517 */
2518 int i;
2519 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2520 if ((tmptaint >> i) & 1)
2521 add_taint(i);
2522 }
2523 }
2524
2525 return err;
34f5a398
TT		 2526}
2527
1da177e4
LT		 2528struct do_proc_dointvec_minmax_conv_param {
2529 int *min;
2530 int *max;
2531};
2532
2533static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2534 int *valp,
2535 int write, void *data)
2536{
2537 struct do_proc_dointvec_minmax_conv_param *param = data;
2538 if (write) {
2539 int val = *negp ? -*lvalp : *lvalp;
2540 if ((param->min && *param->min > val) ||
2541 (param->max && *param->max < val))
2542 return -EINVAL;
2543 *valp = val;
2544 } else {
2545 int val = *valp;
2546 if (val < 0) {
2547 *negp = -1;
2548 *lvalp = (unsigned long)-val;
2549 } else {
2550 *negp = 0;
2551 *lvalp = (unsigned long)val;
2552 }
2553 }
2554 return 0;
2555}
2556
2557/**
2558 * proc_dointvec_minmax - read a vector of integers with min/max values
2559 * @table: the sysctl table
2560 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2561 * @buffer: the user buffer
2562 * @lenp: the size of the user buffer
2563 * @ppos: file position
2564 *
2565 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2566 * values from/to the user buffer, treated as an ASCII string.
2567 *
2568 * This routine will ensure the values are within the range specified by
2569 * table->extra1 (min) and table->extra2 (max).
2570 *
2571 * Returns 0 on success.
2572 */
8d65af78 2573int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2574 void __user *buffer, size_t *lenp, loff_t *ppos)
2575{
2576 struct do_proc_dointvec_minmax_conv_param param = {
2577 .min = (int *) table->extra1,
2578 .max = (int *) table->extra2,
2579 };
8d65af78 2580 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2581 do_proc_dointvec_minmax_conv, &param);
2582}
2583
d8217f07 2584static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2585 void __user *buffer,
2586 size_t *lenp, loff_t *ppos,
2587 unsigned long convmul,
2588 unsigned long convdiv)
2589{
2590#define TMPBUFLEN 21
2591 unsigned long *i, *min, *max, val;
2592 int vleft, first=1, neg;
2593 size_t len, left;
2594 char buf[TMPBUFLEN], *p;
2595 char __user *s = buffer;
2596
fcfbd547 2597 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2598 (*ppos && !write)) {
2599 *lenp = 0;
2600 return 0;
2601 }
2602
fcfbd547 2603 i = (unsigned long *) data;
1da177e4
LT		 2604 min = (unsigned long *) table->extra1;
2605 max = (unsigned long *) table->extra2;
2606 vleft = table->maxlen / sizeof(unsigned long);
2607 left = *lenp;
2608
2609 for (; left && vleft--; i++, min++, max++, first=0) {
2610 if (write) {
2611 while (left) {
2612 char c;
2613 if (get_user(c, s))
2614 return -EFAULT;
2615 if (!isspace(c))
2616 break;
2617 left--;
2618 s++;
2619 }
2620 if (!left)
2621 break;
2622 neg = 0;
2623 len = left;
2624 if (len > TMPBUFLEN-1)
2625 len = TMPBUFLEN-1;
2626 if (copy_from_user(buf, s, len))
2627 return -EFAULT;
2628 buf[len] = 0;
2629 p = buf;
2630 if (*p == '-' && left > 1) {
2631 neg = 1;
bd9b0bac 2632 p++;
1da177e4
LT		 2633 }
2634 if (*p < '0' || *p > '9')
2635 break;
2636 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2637 len = p-buf;
2638 if ((len < left) && *p && !isspace(*p))
2639 break;
2640 if (neg)
2641 val = -val;
2642 s += len;
2643 left -= len;
2644
2645 if(neg)
2646 continue;
2647 if ((min && val < *min) || (max && val > *max))
2648 continue;
2649 *i = val;
2650 } else {
2651 p = buf;
2652 if (!first)
2653 *p++ = '\t';
2654 sprintf(p, "%lu", convdiv * (*i) / convmul);
2655 len = strlen(buf);
2656 if (len > left)
2657 len = left;
2658 if(copy_to_user(s, buf, len))
2659 return -EFAULT;
2660 left -= len;
2661 s += len;
2662 }
2663 }
2664
2665 if (!write && !first && left) {
2666 if(put_user('\n', s))
2667 return -EFAULT;
2668 left--, s++;
2669 }
2670 if (write) {
2671 while (left) {
2672 char c;
2673 if (get_user(c, s++))
2674 return -EFAULT;
2675 if (!isspace(c))
2676 break;
2677 left--;
2678 }
2679 }
2680 if (write && first)
2681 return -EINVAL;
2682 *lenp -= left;
2683 *ppos += *lenp;
2684 return 0;
2685#undef TMPBUFLEN
2686}
2687
d8217f07 2688static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2689 void __user *buffer,
2690 size_t *lenp, loff_t *ppos,
2691 unsigned long convmul,
2692 unsigned long convdiv)
2693{
2694 return __do_proc_doulongvec_minmax(table->data, table, write,
8d65af78 2695 buffer, lenp, ppos, convmul, convdiv);
fcfbd547
KK		 2696}
2697
1da177e4
LT		 2698/**
2699 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2700 * @table: the sysctl table
2701 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2702 * @buffer: the user buffer
2703 * @lenp: the size of the user buffer
2704 * @ppos: file position
2705 *
2706 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2707 * values from/to the user buffer, treated as an ASCII string.
2708 *
2709 * This routine will ensure the values are within the range specified by
2710 * table->extra1 (min) and table->extra2 (max).
2711 *
2712 * Returns 0 on success.
2713 */
8d65af78 2714int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2715 void __user *buffer, size_t *lenp, loff_t *ppos)
2716{
8d65af78 2717 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1da177e4
LT		 2718}
2719
2720/**
2721 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2722 * @table: the sysctl table
2723 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2724 * @buffer: the user buffer
2725 * @lenp: the size of the user buffer
2726 * @ppos: file position
2727 *
2728 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2729 * values from/to the user buffer, treated as an ASCII string. The values
2730 * are treated as milliseconds, and converted to jiffies when they are stored.
2731 *
2732 * This routine will ensure the values are within the range specified by
2733 * table->extra1 (min) and table->extra2 (max).
2734 *
2735 * Returns 0 on success.
2736 */
d8217f07 2737int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2738 void __user *buffer,
2739 size_t *lenp, loff_t *ppos)
2740{
8d65af78 2741 return do_proc_doulongvec_minmax(table, write, buffer,
1da177e4
LT		 2742 lenp, ppos, HZ, 1000l);
2743}
2744
2745
2746static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2747 int *valp,
2748 int write, void *data)
2749{
2750 if (write) {
cba9f33d
BS		 2751 if (*lvalp > LONG_MAX / HZ)
2752 return 1;
1da177e4
LT		 2753 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2754 } else {
2755 int val = *valp;
2756 unsigned long lval;
2757 if (val < 0) {
2758 *negp = -1;
2759 lval = (unsigned long)-val;
2760 } else {
2761 *negp = 0;
2762 lval = (unsigned long)val;
2763 }
2764 *lvalp = lval / HZ;
2765 }
2766 return 0;
2767}
2768
2769static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2770 int *valp,
2771 int write, void *data)
2772{
2773 if (write) {
cba9f33d
BS		 2774 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2775 return 1;
1da177e4
LT		 2776 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2777 } else {
2778 int val = *valp;
2779 unsigned long lval;
2780 if (val < 0) {
2781 *negp = -1;
2782 lval = (unsigned long)-val;
2783 } else {
2784 *negp = 0;
2785 lval = (unsigned long)val;
2786 }
2787 *lvalp = jiffies_to_clock_t(lval);
2788 }
2789 return 0;
2790}
2791
2792static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2793 int *valp,
2794 int write, void *data)
2795{
2796 if (write) {
2797 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2798 } else {
2799 int val = *valp;
2800 unsigned long lval;
2801 if (val < 0) {
2802 *negp = -1;
2803 lval = (unsigned long)-val;
2804 } else {
2805 *negp = 0;
2806 lval = (unsigned long)val;
2807 }
2808 *lvalp = jiffies_to_msecs(lval);
2809 }
2810 return 0;
2811}
2812
2813/**
2814 * proc_dointvec_jiffies - read a vector of integers as seconds
2815 * @table: the sysctl table
2816 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2817 * @buffer: the user buffer
2818 * @lenp: the size of the user buffer
2819 * @ppos: file position
2820 *
2821 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2822 * values from/to the user buffer, treated as an ASCII string.
2823 * The values read are assumed to be in seconds, and are converted into
2824 * jiffies.
2825 *
2826 * Returns 0 on success.
2827 */
8d65af78 2828int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2829 void __user *buffer, size_t *lenp, loff_t *ppos)
2830{
8d65af78 2831 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2832 do_proc_dointvec_jiffies_conv,NULL);
2833}
2834
2835/**
2836 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2837 * @table: the sysctl table
2838 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2839 * @buffer: the user buffer
2840 * @lenp: the size of the user buffer
1e5d5331 2841 * @ppos: pointer to the file position
1da177e4
LT		 2842 *
2843 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2844 * values from/to the user buffer, treated as an ASCII string.
2845 * The values read are assumed to be in 1/USER_HZ seconds, and
2846 * are converted into jiffies.
2847 *
2848 * Returns 0 on success.
2849 */
8d65af78 2850int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2851 void __user *buffer, size_t *lenp, loff_t *ppos)
2852{
8d65af78 2853 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1da177e4
LT		 2854 do_proc_dointvec_userhz_jiffies_conv,NULL);
2855}
2856
2857/**
2858 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2859 * @table: the sysctl table
2860 * @write: %TRUE if this is a write to the sysctl file
1da177e4
LT		 2861 * @buffer: the user buffer
2862 * @lenp: the size of the user buffer
67be2dd1
MW		 2863 * @ppos: file position
2864 * @ppos: the current position in the file
1da177e4
LT		 2865 *
2866 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2867 * values from/to the user buffer, treated as an ASCII string.
2868 * The values read are assumed to be in 1/1000 seconds, and
2869 * are converted into jiffies.
2870 *
2871 * Returns 0 on success.
2872 */
8d65af78 2873int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2874 void __user *buffer, size_t *lenp, loff_t *ppos)
2875{
8d65af78 2876 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1da177e4
LT		 2877 do_proc_dointvec_ms_jiffies_conv, NULL);
2878}
2879
8d65af78 2880static int proc_do_cad_pid(struct ctl_table *table, int write,
9ec52099
CLG		 2881 void __user *buffer, size_t *lenp, loff_t *ppos)
2882{
2883 struct pid *new_pid;
2884 pid_t tmp;
2885 int r;
2886
6c5f3e7b 2887 tmp = pid_vnr(cad_pid);
9ec52099 2888
8d65af78 2889 r = __do_proc_dointvec(&tmp, table, write, buffer,
9ec52099
CLG		 2890 lenp, ppos, NULL, NULL);
2891 if (r || !write)
2892 return r;
2893
2894 new_pid = find_get_pid(tmp);
2895 if (!new_pid)
2896 return -ESRCH;
2897
2898 put_pid(xchg(&cad_pid, new_pid));
2899 return 0;
2900}
2901
1da177e4
LT		 2902#else /* CONFIG_PROC_FS */
2903
8d65af78 2904int proc_dostring(struct ctl_table *table, int write,
1da177e4
LT		 2905 void __user *buffer, size_t *lenp, loff_t *ppos)
2906{
2907 return -ENOSYS;
2908}
2909
8d65af78 2910int proc_dointvec(struct ctl_table *table, int write,
1da177e4 2911 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2912{
2913 return -ENOSYS;
2914}
2915
8d65af78 2916int proc_dointvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2917 void __user *buffer, size_t *lenp, loff_t *ppos)
2918{
2919 return -ENOSYS;
2920}
2921
8d65af78 2922int proc_dointvec_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2923 void __user *buffer, size_t *lenp, loff_t *ppos)
2924{
2925 return -ENOSYS;
2926}
2927
8d65af78 2928int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2929 void __user *buffer, size_t *lenp, loff_t *ppos)
2930{
2931 return -ENOSYS;
2932}
2933
8d65af78 2934int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1da177e4
LT		 2935 void __user *buffer, size_t *lenp, loff_t *ppos)
2936{
2937 return -ENOSYS;
2938}
2939
8d65af78 2940int proc_doulongvec_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2941 void __user *buffer, size_t *lenp, loff_t *ppos)
2942{
2943 return -ENOSYS;
2944}
2945
d8217f07 2946int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2947 void __user *buffer,
2948 size_t *lenp, loff_t *ppos)
2949{
2950 return -ENOSYS;
2951}
2952
2953
2954#endif /* CONFIG_PROC_FS */
2955
2956
b89a8171 2957#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2958/*
2959 * General sysctl support routines
2960 */
2961
49a0c458 2962/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2963int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2964 void __user *oldval, size_t __user *oldlenp,
2965 void __user *newval, size_t newlen)
2966{
2967 size_t len;
2968
2969 /* Get out of I don't have a variable */
2970 if (!table->data || !table->maxlen)
2971 return -ENOTDIR;
2972
2973 if (oldval && oldlenp) {
2974 if (get_user(len, oldlenp))
2975 return -EFAULT;
2976 if (len) {
2977 if (len > table->maxlen)
2978 len = table->maxlen;
2979 if (copy_to_user(oldval, table->data, len))
2980 return -EFAULT;
2981 if (put_user(len, oldlenp))
2982 return -EFAULT;
2983 }
2984 }
2985
2986 if (newval && newlen) {
2987 if (newlen > table->maxlen)
2988 newlen = table->maxlen;
2989
2990 if (copy_from_user(table->data, newval, newlen))
2991 return -EFAULT;
2992 }
2993 return 1;
2994}
2995
1da177e4 2996/* The generic string strategy routine: */
f221e726 2997int sysctl_string(struct ctl_table *table,
1da177e4 2998 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2999 void __user *newval, size_t newlen)
1da177e4 3000{
1da177e4
LT		 3001 if (!table->data || !table->maxlen)
3002 return -ENOTDIR;
3003
3004 if (oldval && oldlenp) {
de9e007d
LT		 3005 size_t bufsize;
3006 if (get_user(bufsize, oldlenp))
1da177e4 3007 return -EFAULT;
de9e007d
LT		 3008 if (bufsize) {
3009 size_t len = strlen(table->data), copied;
3010
3011 /* This shouldn't trigger for a well-formed sysctl */
3012 if (len > table->maxlen)
1da177e4 3013 len = table->maxlen;
de9e007d
LT		 3014
3015 /* Copy up to a max of bufsize-1 bytes of the string */
3016 copied = (len >= bufsize) ? bufsize - 1 : len;
3017
3018 if (copy_to_user(oldval, table->data, copied) ||
3019 put_user(0, (char __user *)(oldval + copied)))
1da177e4 3020 return -EFAULT;
de9e007d 3021 if (put_user(len, oldlenp))
1da177e4
LT		 3022 return -EFAULT;
3023 }
3024 }
3025 if (newval && newlen) {
de9e007d 3026 size_t len = newlen;
1da177e4
LT		 3027 if (len > table->maxlen)
3028 len = table->maxlen;
3029 if(copy_from_user(table->data, newval, len))
3030 return -EFAULT;
3031 if (len == table->maxlen)
3032 len--;
3033 ((char *) table->data)[len] = 0;
3034 }
82c9df82 3035 return 1;
1da177e4
LT		 3036}
3037
3038/*
3039 * This function makes sure that all of the integers in the vector
3040 * are between the minimum and maximum values given in the arrays
3041 * table->extra1 and table->extra2, respectively.
3042 */
f221e726 3043int sysctl_intvec(struct ctl_table *table,
1da177e4 3044 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3045 void __user *newval, size_t newlen)
1da177e4
LT		 3046{
3047
3048 if (newval && newlen) {
3049 int __user *vec = (int __user *) newval;
3050 int *min = (int *) table->extra1;
3051 int *max = (int *) table->extra2;
3052 size_t length;
3053 int i;
3054
3055 if (newlen % sizeof(int) != 0)
3056 return -EINVAL;
3057
3058 if (!table->extra1 && !table->extra2)
3059 return 0;
3060
3061 if (newlen > table->maxlen)
3062 newlen = table->maxlen;
3063 length = newlen / sizeof(int);
3064
3065 for (i = 0; i < length; i++) {
3066 int value;
3067 if (get_user(value, vec + i))
3068 return -EFAULT;
3069 if (min && value < min[i])
3070 return -EINVAL;
3071 if (max && value > max[i])
3072 return -EINVAL;
3073 }
3074 }
3075 return 0;
3076}
3077
3078/* Strategy function to convert jiffies to seconds */
f221e726 3079int sysctl_jiffies(struct ctl_table *table,
1da177e4 3080 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3081 void __user *newval, size_t newlen)
1da177e4 3082{
3ee75ac3 3083 if (oldval && oldlenp) {
1da177e4 3084 size_t olen;
3ee75ac3
AD		 3085
3086 if (get_user(olen, oldlenp))
3087 return -EFAULT;
3088 if (olen) {
3089 int val;
3090
3091 if (olen < sizeof(int))
3092 return -EINVAL;
3093
3094 val = *(int *)(table->data) / HZ;
3095 if (put_user(val, (int __user *)oldval))
3096 return -EFAULT;
3097 if (put_user(sizeof(int), oldlenp))
1da177e4 3098 return -EFAULT;
1da177e4 3099 }
1da177e4
LT		 3100 }
3101 if (newval && newlen) {
3102 int new;
3103 if (newlen != sizeof(int))
3104 return -EINVAL;
3105 if (get_user(new, (int __user *)newval))
3106 return -EFAULT;
3107 *(int *)(table->data) = new*HZ;
3108 }
3109 return 1;
3110}
3111
3112/* Strategy function to convert jiffies to seconds */
f221e726 3113int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3114 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3115 void __user *newval, size_t newlen)
1da177e4 3116{
3ee75ac3 3117 if (oldval && oldlenp) {
1da177e4 3118 size_t olen;
3ee75ac3
AD		 3119
3120 if (get_user(olen, oldlenp))
3121 return -EFAULT;
3122 if (olen) {
3123 int val;
3124
3125 if (olen < sizeof(int))
3126 return -EINVAL;
3127
3128 val = jiffies_to_msecs(*(int *)(table->data));
3129 if (put_user(val, (int __user *)oldval))
3130 return -EFAULT;
3131 if (put_user(sizeof(int), oldlenp))
1da177e4 3132 return -EFAULT;
1da177e4 3133 }
1da177e4
LT		 3134 }
3135 if (newval && newlen) {
3136 int new;
3137 if (newlen != sizeof(int))
3138 return -EINVAL;
3139 if (get_user(new, (int __user *)newval))
3140 return -EFAULT;
3141 *(int *)(table->data) = msecs_to_jiffies(new);
3142 }
3143 return 1;
3144}
3145
c4b8b769 3146
c4b8b769 3147
b89a8171 3148#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3149
3150
1e7bfb21 3151SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3152{
0e009be8 3153 struct __sysctl_args tmp;
7058cb02 3154 int error;
0e009be8 3155
0e009be8
EB		 3156 if (copy_from_user(&tmp, args, sizeof(tmp)))
3157 return -EFAULT;
0e009be8 3158
7058cb02 3159 error = deprecated_sysctl_warning(&tmp);
b89a8171 3160
7058cb02
EB		 3161 /* If no error reading the parameters then just -ENOSYS ... */
3162 if (!error)
3163 error = -ENOSYS;
3164
3165 return error;
1da177e4
LT		 3166}
3167
f221e726 3168int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3169 void __user *oldval, size_t __user *oldlenp,
3170 void __user *newval, size_t newlen)
3171{
3172 return -ENOSYS;
3173}
3174
f221e726 3175int sysctl_string(struct ctl_table *table,
1da177e4 3176 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3177 void __user *newval, size_t newlen)
1da177e4
LT		 3178{
3179 return -ENOSYS;
3180}
3181
f221e726 3182int sysctl_intvec(struct ctl_table *table,
1da177e4 3183 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3184 void __user *newval, size_t newlen)
1da177e4
LT		 3185{
3186 return -ENOSYS;
3187}
3188
f221e726 3189int sysctl_jiffies(struct ctl_table *table,
1da177e4 3190 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3191 void __user *newval, size_t newlen)
1da177e4
LT		 3192{
3193 return -ENOSYS;
3194}
3195
f221e726 3196int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3197 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3198 void __user *newval, size_t newlen)
1da177e4
LT		 3199{
3200 return -ENOSYS;
3201}
3202
b89a8171 3203#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3204
7058cb02
EB		 3205static int deprecated_sysctl_warning(struct __sysctl_args *args)
3206{
3207 static int msg_count;
3208 int name[CTL_MAXNAME];
3209 int i;
3210
6fc48af8
TH		 3211 /* Check args->nlen. */
3212 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3213 return -ENOTDIR;
3214
7058cb02
EB		 3215 /* Read in the sysctl name for better debug message logging */
3216 for (i = 0; i < args->nlen; i++)
3217 if (get_user(name[i], args->name + i))
3218 return -EFAULT;
3219
3220 /* Ignore accesses to kernel.version */
3221 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3222 return 0;
3223
3224 if (msg_count < 5) {
3225 msg_count++;
3226 printk(KERN_INFO
3227 "warning: process `%s' used the deprecated sysctl "
3228 "system call with ", current->comm);
3229 for (i = 0; i < args->nlen; i++)
3230 printk("%d.", name[i]);
3231 printk("\n");
3232 }
3233 return 0;
3234}
3235
1da177e4
LT		 3236/*
3237 * No sense putting this after each symbol definition, twice,
3238 * exception granted :-)
3239 */
3240EXPORT_SYMBOL(proc_dointvec);
3241EXPORT_SYMBOL(proc_dointvec_jiffies);
3242EXPORT_SYMBOL(proc_dointvec_minmax);
3243EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3244EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3245EXPORT_SYMBOL(proc_dostring);
3246EXPORT_SYMBOL(proc_doulongvec_minmax);
3247EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3248EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3249EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3250EXPORT_SYMBOL(sysctl_intvec);
3251EXPORT_SYMBOL(sysctl_jiffies);
3252EXPORT_SYMBOL(sysctl_ms_jiffies);
3253EXPORT_SYMBOL(sysctl_string);
49a0c458 3254EXPORT_SYMBOL(sysctl_data);
1da177e4 3255EXPORT_SYMBOL(unregister_sysctl_table);
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