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kallsyms: unify 32- and 64-bit code
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / sysctl.c
CommitLineData
1da177e4
LT		 1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
1da177e4
LT		 21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
26#include <linux/proc_fs.h>
72c2d582 27#include <linux/security.h>
1da177e4
LT		 28#include <linux/ctype.h>
29#include <linux/utsname.h>
1da177e4 30#include <linux/smp_lock.h>
62239ac2 31#include <linux/fs.h>
1da177e4
LT		 32#include <linux/init.h>
33#include <linux/kernel.h>
0296b228 34#include <linux/kobject.h>
20380731 35#include <linux/net.h>
1da177e4
LT		 36#include <linux/sysrq.h>
37#include <linux/highuid.h>
38#include <linux/writeback.h>
39#include <linux/hugetlb.h>
1da177e4 40#include <linux/initrd.h>
0b77f5bf 41#include <linux/key.h>
1da177e4
LT		 42#include <linux/times.h>
43#include <linux/limits.h>
44#include <linux/dcache.h>
45#include <linux/syscalls.h>
c748e134 46#include <linux/vmstat.h>
c255d844
PM		 47#include <linux/nfs_fs.h>
48#include <linux/acpi.h>
10a0a8d4 49#include <linux/reboot.h>
b0fc494f 50#include <linux/ftrace.h>
1da177e4
LT		 51
52#include <asm/uaccess.h>
53#include <asm/processor.h>
54
29cbc78b
AK		 55#ifdef CONFIG_X86
56#include <asm/nmi.h>
0741f4d2 57#include <asm/stacktrace.h>
6e7c4025 58#include <asm/io.h>
29cbc78b
AK		 59#endif
60
7058cb02
EB		 61static int deprecated_sysctl_warning(struct __sysctl_args *args);
62
1da177e4
LT		 63#if defined(CONFIG_SYSCTL)
64
65/* External variables not in a header file. */
66extern int C_A_D;
45807a1d 67extern int print_fatal_signals;
1da177e4
LT		 68extern int sysctl_overcommit_memory;
69extern int sysctl_overcommit_ratio;
fadd8fbd 70extern int sysctl_panic_on_oom;
fe071d7e 71extern int sysctl_oom_kill_allocating_task;
fef1bdd6 72extern int sysctl_oom_dump_tasks;
1da177e4 73extern int max_threads;
1da177e4 74extern int core_uses_pid;
d6e71144 75extern int suid_dumpable;
1da177e4 76extern char core_pattern[];
1da177e4
LT		 77extern int pid_max;
78extern int min_free_kbytes;
1da177e4 79extern int pid_max_min, pid_max_max;
9d0243bc 80extern int sysctl_drop_caches;
8ad4b1fb 81extern int percpu_pagelist_fraction;
bebfa101 82extern int compat_log;
5096add8 83extern int maps_protect;
9745512c 84extern int latencytop_enabled;
eceea0b3 85extern int sysctl_nr_open_min, sysctl_nr_open_max;
31a72bce
PM		 86#ifdef CONFIG_RCU_TORTURE_TEST
87extern int rcutorture_runnable;
88#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 89
c4f3b63f 90/* Constants used for minimum and maximum */
1c4cd6dd 91#if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
c4f3b63f 92static int one = 1;
195cf453
BG		 93#endif
94
95#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 96static int sixty = 60;
9383d967 97static int neg_one = -1;
c4f3b63f
RT		 98#endif
99
100#ifdef CONFIG_MMU
101static int two = 2;
102#endif
103
104static int zero;
105static int one_hundred = 100;
106
1da177e4
LT		 107/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
108static int maxolduid = 65535;
109static int minolduid;
8ad4b1fb 110static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 111
112static int ngroups_max = NGROUPS_MAX;
113
a1ef5adb 114#ifdef CONFIG_MODULES
1da177e4
LT		 115extern char modprobe_path[];
116#endif
1da177e4
LT		 117#ifdef CONFIG_CHR_DEV_SG
118extern int sg_big_buff;
119#endif
1da177e4
LT		 120
121#ifdef __sparc__
122extern char reboot_command [];
123extern int stop_a_enabled;
124extern int scons_pwroff;
125#endif
126
127#ifdef __hppa__
128extern int pwrsw_enabled;
129extern int unaligned_enabled;
130#endif
131
347a8dc3 132#ifdef CONFIG_S390
1da177e4
LT		 133#ifdef CONFIG_MATHEMU
134extern int sysctl_ieee_emulation_warnings;
135#endif
136extern int sysctl_userprocess_debug;
951f22d5 137extern int spin_retry;
1da177e4
LT		 138#endif
139
1da177e4
LT		 140#ifdef CONFIG_BSD_PROCESS_ACCT
141extern int acct_parm[];
142#endif
143
d2b176ed
JS		 144#ifdef CONFIG_IA64
145extern int no_unaligned_warning;
146#endif
147
23f78d4a
IM		 148#ifdef CONFIG_RT_MUTEXES
149extern int max_lock_depth;
150#endif
151
d6f8ff73 152#ifdef CONFIG_PROC_SYSCTL
d8217f07 153static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 154 void __user *buffer, size_t *lenp, loff_t *ppos);
d8217f07 155static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 156 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 157#endif
9ec52099 158
d8217f07 159static struct ctl_table root_table[];
e51b6ba0
EB		 160static struct ctl_table_root sysctl_table_root;
161static struct ctl_table_header root_table_header = {
162 .ctl_table = root_table,
163 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
164 .root = &sysctl_table_root,
165};
166static struct ctl_table_root sysctl_table_root = {
167 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
168 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
169};
1da177e4 170
d8217f07
EB		 171static struct ctl_table kern_table[];
172static struct ctl_table vm_table[];
173static struct ctl_table fs_table[];
174static struct ctl_table debug_table[];
175static struct ctl_table dev_table[];
176extern struct ctl_table random_table[];
2d9048e2 177#ifdef CONFIG_INOTIFY_USER
d8217f07 178extern struct ctl_table inotify_table[];
0399cb08 179#endif
1da177e4
LT		 180
181#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
182int sysctl_legacy_va_layout;
183#endif
184
f20786ff
PZ		 185extern int prove_locking;
186extern int lock_stat;
9bc9a6bd 187
1da177e4
LT		 188/* The default sysctl tables: */
189
d8217f07 190static struct ctl_table root_table[] = {
1da177e4
LT		 191 {
192 .ctl_name = CTL_KERN,
193 .procname = "kernel",
194 .mode = 0555,
195 .child = kern_table,
196 },
197 {
198 .ctl_name = CTL_VM,
199 .procname = "vm",
200 .mode = 0555,
201 .child = vm_table,
202 },
1da177e4
LT		 203 {
204 .ctl_name = CTL_FS,
205 .procname = "fs",
206 .mode = 0555,
207 .child = fs_table,
208 },
209 {
210 .ctl_name = CTL_DEBUG,
211 .procname = "debug",
212 .mode = 0555,
213 .child = debug_table,
214 },
215 {
216 .ctl_name = CTL_DEV,
217 .procname = "dev",
218 .mode = 0555,
219 .child = dev_table,
220 },
2be7fe07
AM		 221/*
222 * NOTE: do not add new entries to this table unless you have read
223 * Documentation/sysctl/ctl_unnumbered.txt
224 */
1da177e4
LT		 225 { .ctl_name = 0 }
226};
227
77e54a1f 228#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 229static int min_sched_granularity_ns = 100000; /* 100 usecs */
230static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
231static int min_wakeup_granularity_ns; /* 0 usecs */
232static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 233#endif
234
d8217f07 235static struct ctl_table kern_table[] = {
77e54a1f
IM		 236#ifdef CONFIG_SCHED_DEBUG
237 {
238 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 239 .procname = "sched_min_granularity_ns",
240 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 241 .maxlen = sizeof(unsigned int),
242 .mode = 0644,
b2be5e96
PZ		 243 .proc_handler = &sched_nr_latency_handler,
244 .strategy = &sysctl_intvec,
245 .extra1 = &min_sched_granularity_ns,
246 .extra2 = &max_sched_granularity_ns,
77e54a1f 247 },
21805085
PZ		 248 {
249 .ctl_name = CTL_UNNUMBERED,
250 .procname = "sched_latency_ns",
251 .data = &sysctl_sched_latency,
252 .maxlen = sizeof(unsigned int),
253 .mode = 0644,
b2be5e96 254 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 255 .strategy = &sysctl_intvec,
256 .extra1 = &min_sched_granularity_ns,
257 .extra2 = &max_sched_granularity_ns,
258 },
77e54a1f
IM		 259 {
260 .ctl_name = CTL_UNNUMBERED,
261 .procname = "sched_wakeup_granularity_ns",
262 .data = &sysctl_sched_wakeup_granularity,
263 .maxlen = sizeof(unsigned int),
264 .mode = 0644,
265 .proc_handler = &proc_dointvec_minmax,
266 .strategy = &sysctl_intvec,
77e54a1f
IM		 267 .extra1 = &min_wakeup_granularity_ns,
268 .extra2 = &max_wakeup_granularity_ns,
269 },
2398f2c6
PZ		 270 {
271 .ctl_name = CTL_UNNUMBERED,
272 .procname = "sched_shares_ratelimit",
273 .data = &sysctl_sched_shares_ratelimit,
274 .maxlen = sizeof(unsigned int),
275 .mode = 0644,
276 .proc_handler = &proc_dointvec,
277 },
77e54a1f
IM		 278 {
279 .ctl_name = CTL_UNNUMBERED,
280 .procname = "sched_child_runs_first",
281 .data = &sysctl_sched_child_runs_first,
282 .maxlen = sizeof(unsigned int),
283 .mode = 0644,
284 .proc_handler = &proc_dointvec,
285 },
1fc84aaa
PZ		 286 {
287 .ctl_name = CTL_UNNUMBERED,
288 .procname = "sched_features",
289 .data = &sysctl_sched_features,
290 .maxlen = sizeof(unsigned int),
291 .mode = 0644,
292 .proc_handler = &proc_dointvec,
293 },
da84d961
IM		 294 {
295 .ctl_name = CTL_UNNUMBERED,
296 .procname = "sched_migration_cost",
297 .data = &sysctl_sched_migration_cost,
298 .maxlen = sizeof(unsigned int),
299 .mode = 0644,
300 .proc_handler = &proc_dointvec,
301 },
b82d9fdd
PZ		 302 {
303 .ctl_name = CTL_UNNUMBERED,
304 .procname = "sched_nr_migrate",
305 .data = &sysctl_sched_nr_migrate,
306 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 307 .mode = 0644,
308 .proc_handler = &proc_dointvec,
309 },
1fc84aaa 310#endif
9f0c1e56
PZ		 311 {
312 .ctl_name = CTL_UNNUMBERED,
313 .procname = "sched_rt_period_us",
314 .data = &sysctl_sched_rt_period,
315 .maxlen = sizeof(unsigned int),
316 .mode = 0644,
d0b27fa7 317 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 318 },
319 {
320 .ctl_name = CTL_UNNUMBERED,
321 .procname = "sched_rt_runtime_us",
322 .data = &sysctl_sched_rt_runtime,
323 .maxlen = sizeof(int),
324 .mode = 0644,
d0b27fa7 325 .proc_handler = &sched_rt_handler,
9f0c1e56 326 },
1799e35d
IM		 327 {
328 .ctl_name = CTL_UNNUMBERED,
329 .procname = "sched_compat_yield",
330 .data = &sysctl_sched_compat_yield,
331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
333 .proc_handler = &proc_dointvec,
334 },
f20786ff
PZ		 335#ifdef CONFIG_PROVE_LOCKING
336 {
337 .ctl_name = CTL_UNNUMBERED,
338 .procname = "prove_locking",
339 .data = &prove_locking,
340 .maxlen = sizeof(int),
341 .mode = 0644,
342 .proc_handler = &proc_dointvec,
343 },
344#endif
345#ifdef CONFIG_LOCK_STAT
346 {
347 .ctl_name = CTL_UNNUMBERED,
348 .procname = "lock_stat",
349 .data = &lock_stat,
350 .maxlen = sizeof(int),
351 .mode = 0644,
352 .proc_handler = &proc_dointvec,
353 },
77e54a1f 354#endif
1da177e4
LT		 355 {
356 .ctl_name = KERN_PANIC,
357 .procname = "panic",
358 .data = &panic_timeout,
359 .maxlen = sizeof(int),
360 .mode = 0644,
361 .proc_handler = &proc_dointvec,
362 },
363 {
364 .ctl_name = KERN_CORE_USES_PID,
365 .procname = "core_uses_pid",
366 .data = &core_uses_pid,
367 .maxlen = sizeof(int),
368 .mode = 0644,
369 .proc_handler = &proc_dointvec,
370 },
371 {
372 .ctl_name = KERN_CORE_PATTERN,
373 .procname = "core_pattern",
374 .data = core_pattern,
71ce92f3 375 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 376 .mode = 0644,
377 .proc_handler = &proc_dostring,
378 .strategy = &sysctl_string,
379 },
34f5a398 380#ifdef CONFIG_PROC_SYSCTL
1da177e4 381 {
1da177e4
LT		 382 .procname = "tainted",
383 .data = &tainted,
384 .maxlen = sizeof(int),
34f5a398
TT		 385 .mode = 0644,
386 .proc_handler = &proc_dointvec_taint,
1da177e4 387 },
34f5a398 388#endif
9745512c
AV		 389#ifdef CONFIG_LATENCYTOP
390 {
391 .procname = "latencytop",
392 .data = &latencytop_enabled,
393 .maxlen = sizeof(int),
394 .mode = 0644,
395 .proc_handler = &proc_dointvec,
396 },
397#endif
1da177e4
LT		 398#ifdef CONFIG_BLK_DEV_INITRD
399 {
400 .ctl_name = KERN_REALROOTDEV,
401 .procname = "real-root-dev",
402 .data = &real_root_dev,
403 .maxlen = sizeof(int),
404 .mode = 0644,
405 .proc_handler = &proc_dointvec,
406 },
407#endif
45807a1d
IM		 408 {
409 .ctl_name = CTL_UNNUMBERED,
410 .procname = "print-fatal-signals",
411 .data = &print_fatal_signals,
412 .maxlen = sizeof(int),
413 .mode = 0644,
414 .proc_handler = &proc_dointvec,
415 },
1da177e4
LT		 416#ifdef __sparc__
417 {
418 .ctl_name = KERN_SPARC_REBOOT,
419 .procname = "reboot-cmd",
420 .data = reboot_command,
421 .maxlen = 256,
422 .mode = 0644,
423 .proc_handler = &proc_dostring,
424 .strategy = &sysctl_string,
425 },
426 {
427 .ctl_name = KERN_SPARC_STOP_A,
428 .procname = "stop-a",
429 .data = &stop_a_enabled,
430 .maxlen = sizeof (int),
431 .mode = 0644,
432 .proc_handler = &proc_dointvec,
433 },
434 {
435 .ctl_name = KERN_SPARC_SCONS_PWROFF,
436 .procname = "scons-poweroff",
437 .data = &scons_pwroff,
438 .maxlen = sizeof (int),
439 .mode = 0644,
440 .proc_handler = &proc_dointvec,
441 },
442#endif
443#ifdef __hppa__
444 {
445 .ctl_name = KERN_HPPA_PWRSW,
446 .procname = "soft-power",
447 .data = &pwrsw_enabled,
448 .maxlen = sizeof (int),
449 .mode = 0644,
450 .proc_handler = &proc_dointvec,
451 },
452 {
453 .ctl_name = KERN_HPPA_UNALIGNED,
454 .procname = "unaligned-trap",
455 .data = &unaligned_enabled,
456 .maxlen = sizeof (int),
457 .mode = 0644,
458 .proc_handler = &proc_dointvec,
459 },
460#endif
461 {
462 .ctl_name = KERN_CTLALTDEL,
463 .procname = "ctrl-alt-del",
464 .data = &C_A_D,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = &proc_dointvec,
468 },
b0fc494f
SR		 469#ifdef CONFIG_FTRACE
470 {
471 .ctl_name = CTL_UNNUMBERED,
472 .procname = "ftrace_enabled",
473 .data = &ftrace_enabled,
474 .maxlen = sizeof(int),
475 .mode = 0644,
476 .proc_handler = &ftrace_enable_sysctl,
477 },
478#endif
a1ef5adb 479#ifdef CONFIG_MODULES
1da177e4
LT		 480 {
481 .ctl_name = KERN_MODPROBE,
482 .procname = "modprobe",
483 .data = &modprobe_path,
484 .maxlen = KMOD_PATH_LEN,
485 .mode = 0644,
486 .proc_handler = &proc_dostring,
487 .strategy = &sysctl_string,
488 },
489#endif
57ae2508 490#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 491 {
492 .ctl_name = KERN_HOTPLUG,
493 .procname = "hotplug",
312c004d
KS		 494 .data = &uevent_helper,
495 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 496 .mode = 0644,
497 .proc_handler = &proc_dostring,
498 .strategy = &sysctl_string,
499 },
500#endif
501#ifdef CONFIG_CHR_DEV_SG
502 {
503 .ctl_name = KERN_SG_BIG_BUFF,
504 .procname = "sg-big-buff",
505 .data = &sg_big_buff,
506 .maxlen = sizeof (int),
507 .mode = 0444,
508 .proc_handler = &proc_dointvec,
509 },
510#endif
511#ifdef CONFIG_BSD_PROCESS_ACCT
512 {
513 .ctl_name = KERN_ACCT,
514 .procname = "acct",
515 .data = &acct_parm,
516 .maxlen = 3*sizeof(int),
517 .mode = 0644,
518 .proc_handler = &proc_dointvec,
519 },
520#endif
1da177e4
LT		 521#ifdef CONFIG_MAGIC_SYSRQ
522 {
523 .ctl_name = KERN_SYSRQ,
524 .procname = "sysrq",
5d6f647f 525 .data = &__sysrq_enabled,
1da177e4
LT		 526 .maxlen = sizeof (int),
527 .mode = 0644,
528 .proc_handler = &proc_dointvec,
529 },
530#endif
d6f8ff73 531#ifdef CONFIG_PROC_SYSCTL
1da177e4 532 {
1da177e4 533 .procname = "cad_pid",
9ec52099 534 .data = NULL,
1da177e4
LT		 535 .maxlen = sizeof (int),
536 .mode = 0600,
9ec52099 537 .proc_handler = &proc_do_cad_pid,
1da177e4 538 },
d6f8ff73 539#endif
1da177e4
LT		 540 {
541 .ctl_name = KERN_MAX_THREADS,
542 .procname = "threads-max",
543 .data = &max_threads,
544 .maxlen = sizeof(int),
545 .mode = 0644,
546 .proc_handler = &proc_dointvec,
547 },
548 {
549 .ctl_name = KERN_RANDOM,
550 .procname = "random",
551 .mode = 0555,
552 .child = random_table,
553 },
1da177e4
LT		 554 {
555 .ctl_name = KERN_OVERFLOWUID,
556 .procname = "overflowuid",
557 .data = &overflowuid,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 .proc_handler = &proc_dointvec_minmax,
561 .strategy = &sysctl_intvec,
562 .extra1 = &minolduid,
563 .extra2 = &maxolduid,
564 },
565 {
566 .ctl_name = KERN_OVERFLOWGID,
567 .procname = "overflowgid",
568 .data = &overflowgid,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 .proc_handler = &proc_dointvec_minmax,
572 .strategy = &sysctl_intvec,
573 .extra1 = &minolduid,
574 .extra2 = &maxolduid,
575 },
347a8dc3 576#ifdef CONFIG_S390
1da177e4
LT		 577#ifdef CONFIG_MATHEMU
578 {
579 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
580 .procname = "ieee_emulation_warnings",
581 .data = &sysctl_ieee_emulation_warnings,
582 .maxlen = sizeof(int),
583 .mode = 0644,
584 .proc_handler = &proc_dointvec,
585 },
1da177e4
LT		 586#endif
587 {
588 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
589 .procname = "userprocess_debug",
590 .data = &sysctl_userprocess_debug,
591 .maxlen = sizeof(int),
592 .mode = 0644,
593 .proc_handler = &proc_dointvec,
594 },
595#endif
596 {
597 .ctl_name = KERN_PIDMAX,
598 .procname = "pid_max",
599 .data = &pid_max,
600 .maxlen = sizeof (int),
601 .mode = 0644,
602 .proc_handler = &proc_dointvec_minmax,
603 .strategy = sysctl_intvec,
604 .extra1 = &pid_max_min,
605 .extra2 = &pid_max_max,
606 },
607 {
608 .ctl_name = KERN_PANIC_ON_OOPS,
609 .procname = "panic_on_oops",
610 .data = &panic_on_oops,
611 .maxlen = sizeof(int),
612 .mode = 0644,
613 .proc_handler = &proc_dointvec,
614 },
7ef3d2fd
JP		 615#if defined CONFIG_PRINTK
616 {
617 .ctl_name = KERN_PRINTK,
618 .procname = "printk",
619 .data = &console_loglevel,
620 .maxlen = 4*sizeof(int),
621 .mode = 0644,
622 .proc_handler = &proc_dointvec,
623 },
1da177e4
LT		 624 {
625 .ctl_name = KERN_PRINTK_RATELIMIT,
626 .procname = "printk_ratelimit",
627 .data = &printk_ratelimit_jiffies,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 .proc_handler = &proc_dointvec_jiffies,
631 .strategy = &sysctl_jiffies,
632 },
633 {
634 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
635 .procname = "printk_ratelimit_burst",
636 .data = &printk_ratelimit_burst,
637 .maxlen = sizeof(int),
638 .mode = 0644,
639 .proc_handler = &proc_dointvec,
640 },
7ef3d2fd 641#endif
1da177e4
LT		 642 {
643 .ctl_name = KERN_NGROUPS_MAX,
644 .procname = "ngroups_max",
645 .data = &ngroups_max,
646 .maxlen = sizeof (int),
647 .mode = 0444,
648 .proc_handler = &proc_dointvec,
649 },
650#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
651 {
652 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
653 .procname = "unknown_nmi_panic",
654 .data = &unknown_nmi_panic,
655 .maxlen = sizeof (int),
656 .mode = 0644,
2fbe7b25 657 .proc_handler = &proc_dointvec,
1da177e4 658 },
407984f1 659 {
407984f1
DZ		 660 .procname = "nmi_watchdog",
661 .data = &nmi_watchdog_enabled,
662 .maxlen = sizeof (int),
663 .mode = 0644,
664 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 665 },
666#endif
667#if defined(CONFIG_X86)
8da5adda
DZ		 668 {
669 .ctl_name = KERN_PANIC_ON_NMI,
670 .procname = "panic_on_unrecovered_nmi",
671 .data = &panic_on_unrecovered_nmi,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = &proc_dointvec,
675 },
1da177e4
LT		 676 {
677 .ctl_name = KERN_BOOTLOADER_TYPE,
678 .procname = "bootloader_type",
679 .data = &bootloader_type,
680 .maxlen = sizeof (int),
681 .mode = 0444,
682 .proc_handler = &proc_dointvec,
683 },
0741f4d2
CE		 684 {
685 .ctl_name = CTL_UNNUMBERED,
686 .procname = "kstack_depth_to_print",
687 .data = &kstack_depth_to_print,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = &proc_dointvec,
691 },
6e7c4025
IM		 692 {
693 .ctl_name = CTL_UNNUMBERED,
694 .procname = "io_delay_type",
695 .data = &io_delay_type,
696 .maxlen = sizeof(int),
697 .mode = 0644,
698 .proc_handler = &proc_dointvec,
699 },
1da177e4 700#endif
7a9166e3 701#if defined(CONFIG_MMU)
1da177e4
LT		 702 {
703 .ctl_name = KERN_RANDOMIZE,
704 .procname = "randomize_va_space",
705 .data = &randomize_va_space,
706 .maxlen = sizeof(int),
707 .mode = 0644,
708 .proc_handler = &proc_dointvec,
709 },
7a9166e3 710#endif
0152fb37 711#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 712 {
713 .ctl_name = KERN_SPIN_RETRY,
714 .procname = "spin_retry",
715 .data = &spin_retry,
716 .maxlen = sizeof (int),
717 .mode = 0644,
718 .proc_handler = &proc_dointvec,
719 },
c255d844 720#endif
673d5b43 721#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 722 {
c255d844 723 .procname = "acpi_video_flags",
77afcf78 724 .data = &acpi_realmode_flags,
c255d844
PM		 725 .maxlen = sizeof (unsigned long),
726 .mode = 0644,
7f99f06f 727 .proc_handler = &proc_doulongvec_minmax,
c255d844 728 },
d2b176ed
JS		 729#endif
730#ifdef CONFIG_IA64
731 {
732 .ctl_name = KERN_IA64_UNALIGNED,
733 .procname = "ignore-unaligned-usertrap",
734 .data = &no_unaligned_warning,
735 .maxlen = sizeof (int),
736 .mode = 0644,
737 .proc_handler = &proc_dointvec,
738 },
bebfa101 739#endif
c4f3b63f 740#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 741 {
742 .ctl_name = CTL_UNNUMBERED,
743 .procname = "softlockup_panic",
744 .data = &softlockup_panic,
745 .maxlen = sizeof(int),
746 .mode = 0644,
4dca10a9 747 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 748 .strategy = &sysctl_intvec,
749 .extra1 = &zero,
750 .extra2 = &one,
751 },
c4f3b63f
RT		 752 {
753 .ctl_name = CTL_UNNUMBERED,
754 .procname = "softlockup_thresh",
755 .data = &softlockup_thresh,
9383d967 756 .maxlen = sizeof(int),
c4f3b63f 757 .mode = 0644,
9383d967 758 .proc_handler = &proc_dointvec_minmax,
c4f3b63f 759 .strategy = &sysctl_intvec,
9383d967 760 .extra1 = &neg_one,
c4f3b63f
RT		 761 .extra2 = &sixty,
762 },
82a1fcb9
IM		 763 {
764 .ctl_name = CTL_UNNUMBERED,
765 .procname = "hung_task_check_count",
766 .data = &sysctl_hung_task_check_count,
90739081 767 .maxlen = sizeof(unsigned long),
82a1fcb9 768 .mode = 0644,
90739081 769 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 770 .strategy = &sysctl_intvec,
771 },
772 {
773 .ctl_name = CTL_UNNUMBERED,
774 .procname = "hung_task_timeout_secs",
775 .data = &sysctl_hung_task_timeout_secs,
90739081 776 .maxlen = sizeof(unsigned long),
82a1fcb9 777 .mode = 0644,
90739081 778 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 779 .strategy = &sysctl_intvec,
780 },
781 {
782 .ctl_name = CTL_UNNUMBERED,
783 .procname = "hung_task_warnings",
784 .data = &sysctl_hung_task_warnings,
90739081 785 .maxlen = sizeof(unsigned long),
82a1fcb9 786 .mode = 0644,
90739081 787 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 788 .strategy = &sysctl_intvec,
789 },
c4f3b63f 790#endif
bebfa101
AK		 791#ifdef CONFIG_COMPAT
792 {
793 .ctl_name = KERN_COMPAT_LOG,
794 .procname = "compat-log",
795 .data = &compat_log,
796 .maxlen = sizeof (int),
797 .mode = 0644,
798 .proc_handler = &proc_dointvec,
799 },
951f22d5 800#endif
23f78d4a
IM		 801#ifdef CONFIG_RT_MUTEXES
802 {
803 .ctl_name = KERN_MAX_LOCK_DEPTH,
804 .procname = "max_lock_depth",
805 .data = &max_lock_depth,
806 .maxlen = sizeof(int),
807 .mode = 0644,
808 .proc_handler = &proc_dointvec,
809 },
810#endif
5096add8
KC		 811#ifdef CONFIG_PROC_FS
812 {
813 .ctl_name = CTL_UNNUMBERED,
814 .procname = "maps_protect",
815 .data = &maps_protect,
816 .maxlen = sizeof(int),
817 .mode = 0644,
818 .proc_handler = &proc_dointvec,
819 },
820#endif
10a0a8d4
JF		 821 {
822 .ctl_name = CTL_UNNUMBERED,
823 .procname = "poweroff_cmd",
824 .data = &poweroff_cmd,
825 .maxlen = POWEROFF_CMD_PATH_LEN,
826 .mode = 0644,
827 .proc_handler = &proc_dostring,
828 .strategy = &sysctl_string,
829 },
0b77f5bf
DH		 830#ifdef CONFIG_KEYS
831 {
832 .ctl_name = CTL_UNNUMBERED,
833 .procname = "keys",
834 .mode = 0555,
835 .child = key_sysctls,
836 },
837#endif
31a72bce
PM		 838#ifdef CONFIG_RCU_TORTURE_TEST
839 {
840 .ctl_name = CTL_UNNUMBERED,
841 .procname = "rcutorture_runnable",
842 .data = &rcutorture_runnable,
843 .maxlen = sizeof(int),
844 .mode = 0644,
845 .proc_handler = &proc_dointvec,
846 },
847#endif
ed2c12f3
AM		 848/*
849 * NOTE: do not add new entries to this table unless you have read
850 * Documentation/sysctl/ctl_unnumbered.txt
851 */
1da177e4
LT		 852 { .ctl_name = 0 }
853};
854
d8217f07 855static struct ctl_table vm_table[] = {
1da177e4
LT		 856 {
857 .ctl_name = VM_OVERCOMMIT_MEMORY,
858 .procname = "overcommit_memory",
859 .data = &sysctl_overcommit_memory,
860 .maxlen = sizeof(sysctl_overcommit_memory),
861 .mode = 0644,
862 .proc_handler = &proc_dointvec,
863 },
fadd8fbd
KH		 864 {
865 .ctl_name = VM_PANIC_ON_OOM,
866 .procname = "panic_on_oom",
867 .data = &sysctl_panic_on_oom,
868 .maxlen = sizeof(sysctl_panic_on_oom),
869 .mode = 0644,
870 .proc_handler = &proc_dointvec,
871 },
fe071d7e
DR		 872 {
873 .ctl_name = CTL_UNNUMBERED,
874 .procname = "oom_kill_allocating_task",
875 .data = &sysctl_oom_kill_allocating_task,
876 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
877 .mode = 0644,
878 .proc_handler = &proc_dointvec,
879 },
fef1bdd6
DR		 880 {
881 .ctl_name = CTL_UNNUMBERED,
882 .procname = "oom_dump_tasks",
883 .data = &sysctl_oom_dump_tasks,
884 .maxlen = sizeof(sysctl_oom_dump_tasks),
885 .mode = 0644,
886 .proc_handler = &proc_dointvec,
887 },
1da177e4
LT		 888 {
889 .ctl_name = VM_OVERCOMMIT_RATIO,
890 .procname = "overcommit_ratio",
891 .data = &sysctl_overcommit_ratio,
892 .maxlen = sizeof(sysctl_overcommit_ratio),
893 .mode = 0644,
894 .proc_handler = &proc_dointvec,
895 },
896 {
897 .ctl_name = VM_PAGE_CLUSTER,
898 .procname = "page-cluster",
899 .data = &page_cluster,
900 .maxlen = sizeof(int),
901 .mode = 0644,
902 .proc_handler = &proc_dointvec,
903 },
904 {
905 .ctl_name = VM_DIRTY_BACKGROUND,
906 .procname = "dirty_background_ratio",
907 .data = &dirty_background_ratio,
908 .maxlen = sizeof(dirty_background_ratio),
909 .mode = 0644,
910 .proc_handler = &proc_dointvec_minmax,
911 .strategy = &sysctl_intvec,
912 .extra1 = &zero,
913 .extra2 = &one_hundred,
914 },
915 {
916 .ctl_name = VM_DIRTY_RATIO,
917 .procname = "dirty_ratio",
918 .data = &vm_dirty_ratio,
919 .maxlen = sizeof(vm_dirty_ratio),
920 .mode = 0644,
04fbfdc1 921 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 922 .strategy = &sysctl_intvec,
923 .extra1 = &zero,
924 .extra2 = &one_hundred,
925 },
926 {
1da177e4 927 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 928 .data = &dirty_writeback_interval,
929 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 930 .mode = 0644,
931 .proc_handler = &dirty_writeback_centisecs_handler,
932 },
933 {
1da177e4 934 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 935 .data = &dirty_expire_interval,
936 .maxlen = sizeof(dirty_expire_interval),
1da177e4 937 .mode = 0644,
f6ef9438 938 .proc_handler = &proc_dointvec_userhz_jiffies,
1da177e4
LT		 939 },
940 {
941 .ctl_name = VM_NR_PDFLUSH_THREADS,
942 .procname = "nr_pdflush_threads",
943 .data = &nr_pdflush_threads,
944 .maxlen = sizeof nr_pdflush_threads,
945 .mode = 0444 /* read-only*/,
946 .proc_handler = &proc_dointvec,
947 },
948 {
949 .ctl_name = VM_SWAPPINESS,
950 .procname = "swappiness",
951 .data = &vm_swappiness,
952 .maxlen = sizeof(vm_swappiness),
953 .mode = 0644,
954 .proc_handler = &proc_dointvec_minmax,
955 .strategy = &sysctl_intvec,
956 .extra1 = &zero,
957 .extra2 = &one_hundred,
958 },
959#ifdef CONFIG_HUGETLB_PAGE
960 {
1da177e4 961 .procname = "nr_hugepages",
e5ff2159 962 .data = NULL,
1da177e4
LT		 963 .maxlen = sizeof(unsigned long),
964 .mode = 0644,
965 .proc_handler = &hugetlb_sysctl_handler,
966 .extra1 = (void *)&hugetlb_zero,
967 .extra2 = (void *)&hugetlb_infinity,
968 },
969 {
970 .ctl_name = VM_HUGETLB_GROUP,
971 .procname = "hugetlb_shm_group",
972 .data = &sysctl_hugetlb_shm_group,
973 .maxlen = sizeof(gid_t),
974 .mode = 0644,
975 .proc_handler = &proc_dointvec,
976 },
396faf03
MG		 977 {
978 .ctl_name = CTL_UNNUMBERED,
979 .procname = "hugepages_treat_as_movable",
980 .data = &hugepages_treat_as_movable,
981 .maxlen = sizeof(int),
982 .mode = 0644,
983 .proc_handler = &hugetlb_treat_movable_handler,
984 },
d1c3fb1f
NA		 985 {
986 .ctl_name = CTL_UNNUMBERED,
987 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 988 .data = NULL,
989 .maxlen = sizeof(unsigned long),
d1c3fb1f 990 .mode = 0644,
a3d0c6aa 991 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 992 .extra1 = (void *)&hugetlb_zero,
993 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 994 },
1da177e4
LT		 995#endif
996 {
997 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
998 .procname = "lowmem_reserve_ratio",
999 .data = &sysctl_lowmem_reserve_ratio,
1000 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1001 .mode = 0644,
1002 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1003 .strategy = &sysctl_intvec,
1004 },
9d0243bc
AM		 1005 {
1006 .ctl_name = VM_DROP_PAGECACHE,
1007 .procname = "drop_caches",
1008 .data = &sysctl_drop_caches,
1009 .maxlen = sizeof(int),
1010 .mode = 0644,
1011 .proc_handler = drop_caches_sysctl_handler,
1012 .strategy = &sysctl_intvec,
1013 },
1da177e4
LT		 1014 {
1015 .ctl_name = VM_MIN_FREE_KBYTES,
1016 .procname = "min_free_kbytes",
1017 .data = &min_free_kbytes,
1018 .maxlen = sizeof(min_free_kbytes),
1019 .mode = 0644,
1020 .proc_handler = &min_free_kbytes_sysctl_handler,
1021 .strategy = &sysctl_intvec,
1022 .extra1 = &zero,
1023 },
8ad4b1fb
RS		 1024 {
1025 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1026 .procname = "percpu_pagelist_fraction",
1027 .data = &percpu_pagelist_fraction,
1028 .maxlen = sizeof(percpu_pagelist_fraction),
1029 .mode = 0644,
1030 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1031 .strategy = &sysctl_intvec,
1032 .extra1 = &min_percpu_pagelist_fract,
1033 },
1da177e4
LT		 1034#ifdef CONFIG_MMU
1035 {
1036 .ctl_name = VM_MAX_MAP_COUNT,
1037 .procname = "max_map_count",
1038 .data = &sysctl_max_map_count,
1039 .maxlen = sizeof(sysctl_max_map_count),
1040 .mode = 0644,
1041 .proc_handler = &proc_dointvec
1042 },
1043#endif
1044 {
1045 .ctl_name = VM_LAPTOP_MODE,
1046 .procname = "laptop_mode",
1047 .data = &laptop_mode,
1048 .maxlen = sizeof(laptop_mode),
1049 .mode = 0644,
ed5b43f1
BS		 1050 .proc_handler = &proc_dointvec_jiffies,
1051 .strategy = &sysctl_jiffies,
1da177e4
LT		 1052 },
1053 {
1054 .ctl_name = VM_BLOCK_DUMP,
1055 .procname = "block_dump",
1056 .data = &block_dump,
1057 .maxlen = sizeof(block_dump),
1058 .mode = 0644,
1059 .proc_handler = &proc_dointvec,
1060 .strategy = &sysctl_intvec,
1061 .extra1 = &zero,
1062 },
1063 {
1064 .ctl_name = VM_VFS_CACHE_PRESSURE,
1065 .procname = "vfs_cache_pressure",
1066 .data = &sysctl_vfs_cache_pressure,
1067 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1068 .mode = 0644,
1069 .proc_handler = &proc_dointvec,
1070 .strategy = &sysctl_intvec,
1071 .extra1 = &zero,
1072 },
1073#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1074 {
1075 .ctl_name = VM_LEGACY_VA_LAYOUT,
1076 .procname = "legacy_va_layout",
1077 .data = &sysctl_legacy_va_layout,
1078 .maxlen = sizeof(sysctl_legacy_va_layout),
1079 .mode = 0644,
1080 .proc_handler = &proc_dointvec,
1081 .strategy = &sysctl_intvec,
1082 .extra1 = &zero,
1083 },
1084#endif
1743660b
CL		 1085#ifdef CONFIG_NUMA
1086 {
1087 .ctl_name = VM_ZONE_RECLAIM_MODE,
1088 .procname = "zone_reclaim_mode",
1089 .data = &zone_reclaim_mode,
1090 .maxlen = sizeof(zone_reclaim_mode),
1091 .mode = 0644,
1092 .proc_handler = &proc_dointvec,
c84db23c
CL		 1093 .strategy = &sysctl_intvec,
1094 .extra1 = &zero,
1743660b 1095 },
9614634f
CL		 1096 {
1097 .ctl_name = VM_MIN_UNMAPPED,
1098 .procname = "min_unmapped_ratio",
1099 .data = &sysctl_min_unmapped_ratio,
1100 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1101 .mode = 0644,
1102 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1103 .strategy = &sysctl_intvec,
1104 .extra1 = &zero,
1105 .extra2 = &one_hundred,
1106 },
0ff38490
CL		 1107 {
1108 .ctl_name = VM_MIN_SLAB,
1109 .procname = "min_slab_ratio",
1110 .data = &sysctl_min_slab_ratio,
1111 .maxlen = sizeof(sysctl_min_slab_ratio),
1112 .mode = 0644,
1113 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1114 .strategy = &sysctl_intvec,
1115 .extra1 = &zero,
1116 .extra2 = &one_hundred,
1117 },
e6e5494c 1118#endif
77461ab3
CL		 1119#ifdef CONFIG_SMP
1120 {
1121 .ctl_name = CTL_UNNUMBERED,
1122 .procname = "stat_interval",
1123 .data = &sysctl_stat_interval,
1124 .maxlen = sizeof(sysctl_stat_interval),
1125 .mode = 0644,
1126 .proc_handler = &proc_dointvec_jiffies,
1127 .strategy = &sysctl_jiffies,
1128 },
1129#endif
ed032189
EP		 1130#ifdef CONFIG_SECURITY
1131 {
1132 .ctl_name = CTL_UNNUMBERED,
1133 .procname = "mmap_min_addr",
1134 .data = &mmap_min_addr,
1135 .maxlen = sizeof(unsigned long),
1136 .mode = 0644,
1137 .proc_handler = &proc_doulongvec_minmax,
1138 },
8daec965 1139#endif
f0c0b2b8
KH		 1140#ifdef CONFIG_NUMA
1141 {
1142 .ctl_name = CTL_UNNUMBERED,
1143 .procname = "numa_zonelist_order",
1144 .data = &numa_zonelist_order,
1145 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1146 .mode = 0644,
1147 .proc_handler = &numa_zonelist_order_handler,
1148 .strategy = &sysctl_string,
1149 },
1150#endif
2b8232ce 1151#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1152 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1153 {
1154 .ctl_name = VM_VDSO_ENABLED,
1155 .procname = "vdso_enabled",
1156 .data = &vdso_enabled,
1157 .maxlen = sizeof(vdso_enabled),
1158 .mode = 0644,
1159 .proc_handler = &proc_dointvec,
1160 .strategy = &sysctl_intvec,
1161 .extra1 = &zero,
1162 },
1da177e4 1163#endif
195cf453
BG		 1164#ifdef CONFIG_HIGHMEM
1165 {
1166 .ctl_name = CTL_UNNUMBERED,
1167 .procname = "highmem_is_dirtyable",
1168 .data = &vm_highmem_is_dirtyable,
1169 .maxlen = sizeof(vm_highmem_is_dirtyable),
1170 .mode = 0644,
1171 .proc_handler = &proc_dointvec_minmax,
1172 .strategy = &sysctl_intvec,
1173 .extra1 = &zero,
1174 .extra2 = &one,
1175 },
1176#endif
2be7fe07
AM		 1177/*
1178 * NOTE: do not add new entries to this table unless you have read
1179 * Documentation/sysctl/ctl_unnumbered.txt
1180 */
1da177e4
LT		 1181 { .ctl_name = 0 }
1182};
1183
2abc26fc 1184#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1185static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1186 { .ctl_name = 0 }
1187};
1188#endif
1189
d8217f07 1190static struct ctl_table fs_table[] = {
1da177e4
LT		 1191 {
1192 .ctl_name = FS_NRINODE,
1193 .procname = "inode-nr",
1194 .data = &inodes_stat,
1195 .maxlen = 2*sizeof(int),
1196 .mode = 0444,
1197 .proc_handler = &proc_dointvec,
1198 },
1199 {
1200 .ctl_name = FS_STATINODE,
1201 .procname = "inode-state",
1202 .data = &inodes_stat,
1203 .maxlen = 7*sizeof(int),
1204 .mode = 0444,
1205 .proc_handler = &proc_dointvec,
1206 },
1207 {
1da177e4
LT		 1208 .procname = "file-nr",
1209 .data = &files_stat,
1210 .maxlen = 3*sizeof(int),
1211 .mode = 0444,
529bf6be 1212 .proc_handler = &proc_nr_files,
1da177e4
LT		 1213 },
1214 {
1215 .ctl_name = FS_MAXFILE,
1216 .procname = "file-max",
1217 .data = &files_stat.max_files,
1218 .maxlen = sizeof(int),
1219 .mode = 0644,
1220 .proc_handler = &proc_dointvec,
1221 },
9cfe015a
ED		 1222 {
1223 .ctl_name = CTL_UNNUMBERED,
1224 .procname = "nr_open",
1225 .data = &sysctl_nr_open,
1226 .maxlen = sizeof(int),
1227 .mode = 0644,
eceea0b3
AV		 1228 .proc_handler = &proc_dointvec_minmax,
1229 .extra1 = &sysctl_nr_open_min,
1230 .extra2 = &sysctl_nr_open_max,
9cfe015a 1231 },
1da177e4
LT		 1232 {
1233 .ctl_name = FS_DENTRY,
1234 .procname = "dentry-state",
1235 .data = &dentry_stat,
1236 .maxlen = 6*sizeof(int),
1237 .mode = 0444,
1238 .proc_handler = &proc_dointvec,
1239 },
1240 {
1241 .ctl_name = FS_OVERFLOWUID,
1242 .procname = "overflowuid",
1243 .data = &fs_overflowuid,
1244 .maxlen = sizeof(int),
1245 .mode = 0644,
1246 .proc_handler = &proc_dointvec_minmax,
1247 .strategy = &sysctl_intvec,
1248 .extra1 = &minolduid,
1249 .extra2 = &maxolduid,
1250 },
1251 {
1252 .ctl_name = FS_OVERFLOWGID,
1253 .procname = "overflowgid",
1254 .data = &fs_overflowgid,
1255 .maxlen = sizeof(int),
1256 .mode = 0644,
1257 .proc_handler = &proc_dointvec_minmax,
1258 .strategy = &sysctl_intvec,
1259 .extra1 = &minolduid,
1260 .extra2 = &maxolduid,
1261 },
1262 {
1263 .ctl_name = FS_LEASES,
1264 .procname = "leases-enable",
1265 .data = &leases_enable,
1266 .maxlen = sizeof(int),
1267 .mode = 0644,
1268 .proc_handler = &proc_dointvec,
1269 },
1270#ifdef CONFIG_DNOTIFY
1271 {
1272 .ctl_name = FS_DIR_NOTIFY,
1273 .procname = "dir-notify-enable",
1274 .data = &dir_notify_enable,
1275 .maxlen = sizeof(int),
1276 .mode = 0644,
1277 .proc_handler = &proc_dointvec,
1278 },
1279#endif
1280#ifdef CONFIG_MMU
1281 {
1282 .ctl_name = FS_LEASE_TIME,
1283 .procname = "lease-break-time",
1284 .data = &lease_break_time,
1285 .maxlen = sizeof(int),
1286 .mode = 0644,
76fdbb25
KH		 1287 .proc_handler = &proc_dointvec_minmax,
1288 .strategy = &sysctl_intvec,
1289 .extra1 = &zero,
1290 .extra2 = &two,
1da177e4
LT		 1291 },
1292 {
1da177e4
LT		 1293 .procname = "aio-nr",
1294 .data = &aio_nr,
1295 .maxlen = sizeof(aio_nr),
1296 .mode = 0444,
d55b5fda 1297 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1298 },
1299 {
1da177e4
LT		 1300 .procname = "aio-max-nr",
1301 .data = &aio_max_nr,
1302 .maxlen = sizeof(aio_max_nr),
1303 .mode = 0644,
d55b5fda 1304 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1305 },
2d9048e2 1306#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1307 {
1308 .ctl_name = FS_INOTIFY,
1309 .procname = "inotify",
1310 .mode = 0555,
1311 .child = inotify_table,
1312 },
1313#endif
1da177e4 1314#endif
d6e71144
AC		 1315 {
1316 .ctl_name = KERN_SETUID_DUMPABLE,
1317 .procname = "suid_dumpable",
1318 .data = &suid_dumpable,
1319 .maxlen = sizeof(int),
1320 .mode = 0644,
1321 .proc_handler = &proc_dointvec,
1322 },
2abc26fc
EB		 1323#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1324 {
1325 .ctl_name = CTL_UNNUMBERED,
1326 .procname = "binfmt_misc",
1327 .mode = 0555,
1328 .child = binfmt_misc_table,
1329 },
1330#endif
2be7fe07
AM		 1331/*
1332 * NOTE: do not add new entries to this table unless you have read
1333 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1334 */
1da177e4
LT		 1335 { .ctl_name = 0 }
1336};
1337
d8217f07 1338static struct ctl_table debug_table[] = {
d0c3d534 1339#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1340 {
1341 .ctl_name = CTL_UNNUMBERED,
1342 .procname = "exception-trace",
1343 .data = &show_unhandled_signals,
1344 .maxlen = sizeof(int),
1345 .mode = 0644,
1346 .proc_handler = proc_dointvec
1347 },
1348#endif
1da177e4
LT		 1349 { .ctl_name = 0 }
1350};
1351
d8217f07 1352static struct ctl_table dev_table[] = {
1da177e4 1353 { .ctl_name = 0 }
0eeca283 1354};
1da177e4 1355
330d57fb
AV		 1356static DEFINE_SPINLOCK(sysctl_lock);
1357
1358/* called under sysctl_lock */
1359static int use_table(struct ctl_table_header *p)
1360{
1361 if (unlikely(p->unregistering))
1362 return 0;
1363 p->used++;
1364 return 1;
1365}
1366
1367/* called under sysctl_lock */
1368static void unuse_table(struct ctl_table_header *p)
1369{
1370 if (!--p->used)
1371 if (unlikely(p->unregistering))
1372 complete(p->unregistering);
1373}
1374
1375/* called under sysctl_lock, will reacquire if has to wait */
1376static void start_unregistering(struct ctl_table_header *p)
1377{
1378 /*
1379 * if p->used is 0, nobody will ever touch that entry again;
1380 * we'll eliminate all paths to it before dropping sysctl_lock
1381 */
1382 if (unlikely(p->used)) {
1383 struct completion wait;
1384 init_completion(&wait);
1385 p->unregistering = &wait;
1386 spin_unlock(&sysctl_lock);
1387 wait_for_completion(&wait);
1388 spin_lock(&sysctl_lock);
1389 }
1390 /*
1391 * do not remove from the list until nobody holds it; walking the
1392 * list in do_sysctl() relies on that.
1393 */
1394 list_del_init(&p->ctl_entry);
1395}
1396
805b5d5e
EB		 1397void sysctl_head_finish(struct ctl_table_header *head)
1398{
1399 if (!head)
1400 return;
1401 spin_lock(&sysctl_lock);
1402 unuse_table(head);
1403 spin_unlock(&sysctl_lock);
1404}
1405
e51b6ba0
EB		 1406static struct list_head *
1407lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1408{
e51b6ba0
EB		 1409 struct list_head *header_list;
1410 header_list = &root->header_list;
1411 if (root->lookup)
1412 header_list = root->lookup(root, namespaces);
1413 return header_list;
1414}
1415
1416struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1417 struct ctl_table_header *prev)
1418{
1419 struct ctl_table_root *root;
1420 struct list_head *header_list;
805b5d5e
EB		 1421 struct ctl_table_header *head;
1422 struct list_head *tmp;
e51b6ba0 1423
805b5d5e
EB		 1424 spin_lock(&sysctl_lock);
1425 if (prev) {
e51b6ba0 1426 head = prev;
805b5d5e
EB		 1427 tmp = &prev->ctl_entry;
1428 unuse_table(prev);
1429 goto next;
1430 }
1431 tmp = &root_table_header.ctl_entry;
1432 for (;;) {
1433 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1434
1435 if (!use_table(head))
1436 goto next;
1437 spin_unlock(&sysctl_lock);
1438 return head;
1439 next:
e51b6ba0 1440 root = head->root;
805b5d5e 1441 tmp = tmp->next;
e51b6ba0
EB		 1442 header_list = lookup_header_list(root, namespaces);
1443 if (tmp != header_list)
1444 continue;
1445
1446 do {
1447 root = list_entry(root->root_list.next,
1448 struct ctl_table_root, root_list);
1449 if (root == &sysctl_table_root)
1450 goto out;
1451 header_list = lookup_header_list(root, namespaces);
1452 } while (list_empty(header_list));
1453 tmp = header_list->next;
805b5d5e 1454 }
e51b6ba0 1455out:
805b5d5e
EB		 1456 spin_unlock(&sysctl_lock);
1457 return NULL;
1458}
1459
e51b6ba0
EB		 1460struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1461{
1462 return __sysctl_head_next(current->nsproxy, prev);
1463}
1464
1465void register_sysctl_root(struct ctl_table_root *root)
1466{
1467 spin_lock(&sysctl_lock);
1468 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1469 spin_unlock(&sysctl_lock);
1470}
1471
b89a8171 1472#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1473/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1474static int do_sysctl_strategy(struct ctl_table_root *root,
1475 struct ctl_table *table,
2c4c7155
PE		 1476 int __user *name, int nlen,
1477 void __user *oldval, size_t __user *oldlenp,
1478 void __user *newval, size_t newlen)
1479{
1480 int op = 0, rc;
1481
1482 if (oldval)
1483 op |= 004;
1484 if (newval)
1485 op |= 002;
d7321cd6 1486 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1487 return -EPERM;
1488
1489 if (table->strategy) {
1490 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1491 newval, newlen);
1492 if (rc < 0)
1493 return rc;
1494 if (rc > 0)
1495 return 0;
1496 }
1497
1498 /* If there is no strategy routine, or if the strategy returns
1499 * zero, proceed with automatic r/w */
1500 if (table->data && table->maxlen) {
1501 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1502 newval, newlen);
1503 if (rc < 0)
1504 return rc;
1505 }
1506 return 0;
1507}
1508
1509static int parse_table(int __user *name, int nlen,
1510 void __user *oldval, size_t __user *oldlenp,
1511 void __user *newval, size_t newlen,
d7321cd6 1512 struct ctl_table_root *root,
2c4c7155
PE		 1513 struct ctl_table *table)
1514{
1515 int n;
1516repeat:
1517 if (!nlen)
1518 return -ENOTDIR;
1519 if (get_user(n, name))
1520 return -EFAULT;
1521 for ( ; table->ctl_name || table->procname; table++) {
1522 if (!table->ctl_name)
1523 continue;
1524 if (n == table->ctl_name) {
1525 int error;
1526 if (table->child) {
d7321cd6 1527 if (sysctl_perm(root, table, 001))
2c4c7155
PE		 1528 return -EPERM;
1529 name++;
1530 nlen--;
1531 table = table->child;
1532 goto repeat;
1533 }
d7321cd6 1534 error = do_sysctl_strategy(root, table, name, nlen,
2c4c7155
PE		 1535 oldval, oldlenp,
1536 newval, newlen);
1537 return error;
1538 }
1539 }
1540 return -ENOTDIR;
1541}
1542
1da177e4
LT		 1543int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1544 void __user *newval, size_t newlen)
1545{
805b5d5e 1546 struct ctl_table_header *head;
330d57fb 1547 int error = -ENOTDIR;
1da177e4
LT		 1548
1549 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1550 return -ENOTDIR;
1551 if (oldval) {
1552 int old_len;
1553 if (!oldlenp || get_user(old_len, oldlenp))
1554 return -EFAULT;
1555 }
330d57fb 1556
805b5d5e
EB		 1557 for (head = sysctl_head_next(NULL); head;
1558 head = sysctl_head_next(head)) {
330d57fb 1559 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1560 newval, newlen,
1561 head->root, head->ctl_table);
805b5d5e
EB		 1562 if (error != -ENOTDIR) {
1563 sysctl_head_finish(head);
330d57fb 1564 break;
805b5d5e
EB		 1565 }
1566 }
330d57fb 1567 return error;
1da177e4
LT		 1568}
1569
1570asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1571{
1572 struct __sysctl_args tmp;
1573 int error;
1574
1575 if (copy_from_user(&tmp, args, sizeof(tmp)))
1576 return -EFAULT;
1577
7058cb02
EB		 1578 error = deprecated_sysctl_warning(&tmp);
1579 if (error)
1580 goto out;
1581
1da177e4
LT		 1582 lock_kernel();
1583 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1584 tmp.newval, tmp.newlen);
1585 unlock_kernel();
7058cb02 1586out:
1da177e4
LT		 1587 return error;
1588}
b89a8171 1589#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1590
1591/*
1ff007eb 1592 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1593 * some sysctl variables are readonly even to root.
1594 */
1595
1596static int test_perm(int mode, int op)
1597{
1598 if (!current->euid)
1599 mode >>= 6;
1600 else if (in_egroup_p(0))
1601 mode >>= 3;
1602 if ((mode & op & 0007) == op)
1603 return 0;
1604 return -EACCES;
1605}
1606
d7321cd6 1607int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1608{
1609 int error;
d7321cd6
PE		 1610 int mode;
1611
1da177e4
LT		 1612 error = security_sysctl(table, op);
1613 if (error)
1614 return error;
d7321cd6
PE		 1615
1616 if (root->permissions)
1617 mode = root->permissions(root, current->nsproxy, table);
1618 else
1619 mode = table->mode;
1620
1621 return test_perm(mode, op);
1da177e4
LT		 1622}
1623
d912b0cc
EB		 1624static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1625{
1626 for (; table->ctl_name || table->procname; table++) {
1627 table->parent = parent;
1628 if (table->child)
1629 sysctl_set_parent(table, table->child);
1630 }
1631}
1632
1633static __init int sysctl_init(void)
1634{
1635 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1636#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1637 {
1638 int err;
1639 err = sysctl_check_table(current->nsproxy, root_table);
1640 }
1641#endif
d912b0cc
EB		 1642 return 0;
1643}
1644
1645core_initcall(sysctl_init);
1646
1da177e4 1647/**
e51b6ba0
EB		 1648 * __register_sysctl_paths - register a sysctl hierarchy
1649 * @root: List of sysctl headers to register on
1650 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1651 * @path: The path to the directory the sysctl table is in.
1da177e4 1652 * @table: the top-level table structure
1da177e4
LT		 1653 *
1654 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1655 * array. A completely 0 filled entry terminates the table.
1da177e4 1656 *
d8217f07 1657 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1658 *
1659 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1660 * must be unique within that level of sysctl
1661 *
1662 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1663 * enter a sysctl file
1664 *
1665 * data - a pointer to data for use by proc_handler
1666 *
1667 * maxlen - the maximum size in bytes of the data
1668 *
1669 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1670 *
1671 * child - a pointer to the child sysctl table if this entry is a directory, or
1672 * %NULL.
1673 *
1674 * proc_handler - the text handler routine (described below)
1675 *
1676 * strategy - the strategy routine (described below)
1677 *
1678 * de - for internal use by the sysctl routines
1679 *
1680 * extra1, extra2 - extra pointers usable by the proc handler routines
1681 *
1682 * Leaf nodes in the sysctl tree will be represented by a single file
1683 * under /proc; non-leaf nodes will be represented by directories.
1684 *
1685 * sysctl(2) can automatically manage read and write requests through
1686 * the sysctl table. The data and maxlen fields of the ctl_table
1687 * struct enable minimal validation of the values being written to be
1688 * performed, and the mode field allows minimal authentication.
1689 *
1690 * More sophisticated management can be enabled by the provision of a
1691 * strategy routine with the table entry. This will be called before
1692 * any automatic read or write of the data is performed.
1693 *
1694 * The strategy routine may return
1695 *
1696 * < 0 - Error occurred (error is passed to user process)
1697 *
1698 * 0 - OK - proceed with automatic read or write.
1699 *
1700 * > 0 - OK - read or write has been done by the strategy routine, so
1701 * return immediately.
1702 *
1703 * There must be a proc_handler routine for any terminal nodes
1704 * mirrored under /proc/sys (non-terminals are handled by a built-in
1705 * directory handler). Several default handlers are available to
1706 * cover common cases -
1707 *
1708 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1709 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1710 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1711 *
1712 * It is the handler's job to read the input buffer from user memory
1713 * and process it. The handler should return 0 on success.
1714 *
1715 * This routine returns %NULL on a failure to register, and a pointer
1716 * to the table header on success.
1717 */
e51b6ba0
EB		 1718struct ctl_table_header *__register_sysctl_paths(
1719 struct ctl_table_root *root,
1720 struct nsproxy *namespaces,
1721 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1722{
e51b6ba0 1723 struct list_head *header_list;
29e796fd
EB		 1724 struct ctl_table_header *header;
1725 struct ctl_table *new, **prevp;
1726 unsigned int n, npath;
1727
1728 /* Count the path components */
1729 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1730 ;
1731
1732 /*
1733 * For each path component, allocate a 2-element ctl_table array.
1734 * The first array element will be filled with the sysctl entry
1735 * for this, the second will be the sentinel (ctl_name == 0).
1736 *
1737 * We allocate everything in one go so that we don't have to
1738 * worry about freeing additional memory in unregister_sysctl_table.
1739 */
1740 header = kzalloc(sizeof(struct ctl_table_header) +
1741 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1742 if (!header)
1da177e4 1743 return NULL;
29e796fd
EB		 1744
1745 new = (struct ctl_table *) (header + 1);
1746
1747 /* Now connect the dots */
1748 prevp = &header->ctl_table;
1749 for (n = 0; n < npath; ++n, ++path) {
1750 /* Copy the procname */
1751 new->procname = path->procname;
1752 new->ctl_name = path->ctl_name;
1753 new->mode = 0555;
1754
1755 *prevp = new;
1756 prevp = &new->child;
1757
1758 new += 2;
1759 }
1760 *prevp = table;
23eb06de 1761 header->ctl_table_arg = table;
29e796fd
EB		 1762
1763 INIT_LIST_HEAD(&header->ctl_entry);
1764 header->used = 0;
1765 header->unregistering = NULL;
e51b6ba0 1766 header->root = root;
29e796fd 1767 sysctl_set_parent(NULL, header->ctl_table);
88f458e4 1768#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1769 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1770 kfree(header);
fc6cd25b
EB		 1771 return NULL;
1772 }
88f458e4 1773#endif
330d57fb 1774 spin_lock(&sysctl_lock);
e51b6ba0
EB		 1775 header_list = lookup_header_list(root, namespaces);
1776 list_add_tail(&header->ctl_entry, header_list);
330d57fb 1777 spin_unlock(&sysctl_lock);
29e796fd
EB		 1778
1779 return header;
1780}
1781
e51b6ba0
EB		 1782/**
1783 * register_sysctl_table_path - register a sysctl table hierarchy
1784 * @path: The path to the directory the sysctl table is in.
1785 * @table: the top-level table structure
1786 *
1787 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1788 * array. A completely 0 filled entry terminates the table.
1789 *
1790 * See __register_sysctl_paths for more details.
1791 */
1792struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1793 struct ctl_table *table)
1794{
1795 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1796 path, table);
1797}
1798
29e796fd
EB		 1799/**
1800 * register_sysctl_table - register a sysctl table hierarchy
1801 * @table: the top-level table structure
1802 *
1803 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1804 * array. A completely 0 filled entry terminates the table.
1805 *
1806 * See register_sysctl_paths for more details.
1807 */
1808struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1809{
1810 static const struct ctl_path null_path[] = { {} };
1811
1812 return register_sysctl_paths(null_path, table);
1da177e4
LT		 1813}
1814
1815/**
1816 * unregister_sysctl_table - unregister a sysctl table hierarchy
1817 * @header: the header returned from register_sysctl_table
1818 *
1819 * Unregisters the sysctl table and all children. proc entries may not
1820 * actually be removed until they are no longer used by anyone.
1821 */
1822void unregister_sysctl_table(struct ctl_table_header * header)
1823{
330d57fb 1824 might_sleep();
f1dad166
PE		 1825
1826 if (header == NULL)
1827 return;
1828
330d57fb
AV		 1829 spin_lock(&sysctl_lock);
1830 start_unregistering(header);
330d57fb 1831 spin_unlock(&sysctl_lock);
1da177e4
LT		 1832 kfree(header);
1833}
1834
b89a8171 1835#else /* !CONFIG_SYSCTL */
d8217f07 1836struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 1837{
1838 return NULL;
1839}
1840
29e796fd
EB		 1841struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1842 struct ctl_table *table)
1843{
1844 return NULL;
1845}
1846
b89a8171
EB		 1847void unregister_sysctl_table(struct ctl_table_header * table)
1848{
1849}
1850
1851#endif /* CONFIG_SYSCTL */
1852
1da177e4
LT		 1853/*
1854 * /proc/sys support
1855 */
1856
b89a8171 1857#ifdef CONFIG_PROC_SYSCTL
1da177e4 1858
b1ba4ddd
AB		 1859static int _proc_do_string(void* data, int maxlen, int write,
1860 struct file *filp, void __user *buffer,
1861 size_t *lenp, loff_t *ppos)
1da177e4
LT		 1862{
1863 size_t len;
1864 char __user *p;
1865 char c;
8d060877
ON		 1866
1867 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 1868 *lenp = 0;
1869 return 0;
1870 }
8d060877 1871
1da177e4
LT		 1872 if (write) {
1873 len = 0;
1874 p = buffer;
1875 while (len < *lenp) {
1876 if (get_user(c, p++))
1877 return -EFAULT;
1878 if (c == 0 || c == '\n')
1879 break;
1880 len++;
1881 }
f5dd3d6f
SV		 1882 if (len >= maxlen)
1883 len = maxlen-1;
1884 if(copy_from_user(data, buffer, len))
1da177e4 1885 return -EFAULT;
f5dd3d6f 1886 ((char *) data)[len] = 0;
1da177e4
LT		 1887 *ppos += *lenp;
1888 } else {
f5dd3d6f
SV		 1889 len = strlen(data);
1890 if (len > maxlen)
1891 len = maxlen;
8d060877
ON		 1892
1893 if (*ppos > len) {
1894 *lenp = 0;
1895 return 0;
1896 }
1897
1898 data += *ppos;
1899 len -= *ppos;
1900
1da177e4
LT		 1901 if (len > *lenp)
1902 len = *lenp;
1903 if (len)
f5dd3d6f 1904 if(copy_to_user(buffer, data, len))
1da177e4
LT		 1905 return -EFAULT;
1906 if (len < *lenp) {
1907 if(put_user('\n', ((char __user *) buffer) + len))
1908 return -EFAULT;
1909 len++;
1910 }
1911 *lenp = len;
1912 *ppos += len;
1913 }
1914 return 0;
1915}
1916
f5dd3d6f
SV		 1917/**
1918 * proc_dostring - read a string sysctl
1919 * @table: the sysctl table
1920 * @write: %TRUE if this is a write to the sysctl file
1921 * @filp: the file structure
1922 * @buffer: the user buffer
1923 * @lenp: the size of the user buffer
1924 * @ppos: file position
1925 *
1926 * Reads/writes a string from/to the user buffer. If the kernel
1927 * buffer provided is not large enough to hold the string, the
1928 * string is truncated. The copied string is %NULL-terminated.
1929 * If the string is being read by the user process, it is copied
1930 * and a newline '\n' is added. It is truncated if the buffer is
1931 * not large enough.
1932 *
1933 * Returns 0 on success.
1934 */
d8217f07 1935int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 1936 void __user *buffer, size_t *lenp, loff_t *ppos)
1937{
1938 return _proc_do_string(table->data, table->maxlen, write, filp,
1939 buffer, lenp, ppos);
1940}
1941
1da177e4
LT		 1942
1943static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1944 int *valp,
1945 int write, void *data)
1946{
1947 if (write) {
1948 *valp = *negp ? -*lvalp : *lvalp;
1949 } else {
1950 int val = *valp;
1951 if (val < 0) {
1952 *negp = -1;
1953 *lvalp = (unsigned long)-val;
1954 } else {
1955 *negp = 0;
1956 *lvalp = (unsigned long)val;
1957 }
1958 }
1959 return 0;
1960}
1961
d8217f07 1962static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 1963 int write, struct file *filp, void __user *buffer,
1964 size_t *lenp, loff_t *ppos,
1da177e4
LT		 1965 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1966 int write, void *data),
1967 void *data)
1968{
1969#define TMPBUFLEN 21
1970 int *i, vleft, first=1, neg, val;
1971 unsigned long lval;
1972 size_t left, len;
1973
1974 char buf[TMPBUFLEN], *p;
1975 char __user *s = buffer;
1976
fcfbd547 1977 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 1978 (*ppos && !write)) {
1979 *lenp = 0;
1980 return 0;
1981 }
1982
fcfbd547 1983 i = (int *) tbl_data;
1da177e4
LT		 1984 vleft = table->maxlen / sizeof(*i);
1985 left = *lenp;
1986
1987 if (!conv)
1988 conv = do_proc_dointvec_conv;
1989
1990 for (; left && vleft--; i++, first=0) {
1991 if (write) {
1992 while (left) {
1993 char c;
1994 if (get_user(c, s))
1995 return -EFAULT;
1996 if (!isspace(c))
1997 break;
1998 left--;
1999 s++;
2000 }
2001 if (!left)
2002 break;
2003 neg = 0;
2004 len = left;
2005 if (len > sizeof(buf) - 1)
2006 len = sizeof(buf) - 1;
2007 if (copy_from_user(buf, s, len))
2008 return -EFAULT;
2009 buf[len] = 0;
2010 p = buf;
2011 if (*p == '-' && left > 1) {
2012 neg = 1;
bd9b0bac 2013 p++;
1da177e4
LT		 2014 }
2015 if (*p < '0' || *p > '9')
2016 break;
2017
2018 lval = simple_strtoul(p, &p, 0);
2019
2020 len = p-buf;
2021 if ((len < left) && *p && !isspace(*p))
2022 break;
2023 if (neg)
2024 val = -val;
2025 s += len;
2026 left -= len;
2027
2028 if (conv(&neg, &lval, i, 1, data))
2029 break;
2030 } else {
2031 p = buf;
2032 if (!first)
2033 *p++ = '\t';
2034
2035 if (conv(&neg, &lval, i, 0, data))
2036 break;
2037
2038 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2039 len = strlen(buf);
2040 if (len > left)
2041 len = left;
2042 if(copy_to_user(s, buf, len))
2043 return -EFAULT;
2044 left -= len;
2045 s += len;
2046 }
2047 }
2048
2049 if (!write && !first && left) {
2050 if(put_user('\n', s))
2051 return -EFAULT;
2052 left--, s++;
2053 }
2054 if (write) {
2055 while (left) {
2056 char c;
2057 if (get_user(c, s++))
2058 return -EFAULT;
2059 if (!isspace(c))
2060 break;
2061 left--;
2062 }
2063 }
2064 if (write && first)
2065 return -EINVAL;
2066 *lenp -= left;
2067 *ppos += *lenp;
2068 return 0;
2069#undef TMPBUFLEN
2070}
2071
d8217f07 2072static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2073 void __user *buffer, size_t *lenp, loff_t *ppos,
2074 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2075 int write, void *data),
2076 void *data)
2077{
2078 return __do_proc_dointvec(table->data, table, write, filp,
2079 buffer, lenp, ppos, conv, data);
2080}
2081
1da177e4
LT		 2082/**
2083 * proc_dointvec - read a vector of integers
2084 * @table: the sysctl table
2085 * @write: %TRUE if this is a write to the sysctl file
2086 * @filp: the file structure
2087 * @buffer: the user buffer
2088 * @lenp: the size of the user buffer
2089 * @ppos: file position
2090 *
2091 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2092 * values from/to the user buffer, treated as an ASCII string.
2093 *
2094 * Returns 0 on success.
2095 */
d8217f07 2096int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2097 void __user *buffer, size_t *lenp, loff_t *ppos)
2098{
2099 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2100 NULL,NULL);
2101}
2102
2103#define OP_SET 0
2104#define OP_AND 1
34f5a398 2105#define OP_OR 2
1da177e4
LT		 2106
2107static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2108 int *valp,
2109 int write, void *data)
2110{
2111 int op = *(int *)data;
2112 if (write) {
2113 int val = *negp ? -*lvalp : *lvalp;
2114 switch(op) {
2115 case OP_SET: *valp = val; break;
2116 case OP_AND: *valp &= val; break;
34f5a398 2117 case OP_OR: *valp |= val; break;
1da177e4
LT		 2118 }
2119 } else {
2120 int val = *valp;
2121 if (val < 0) {
2122 *negp = -1;
2123 *lvalp = (unsigned long)-val;
2124 } else {
2125 *negp = 0;
2126 *lvalp = (unsigned long)val;
2127 }
2128 }
2129 return 0;
2130}
2131
34f5a398
TT		 2132/*
2133 * Taint values can only be increased
2134 */
d8217f07 2135static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2136 void __user *buffer, size_t *lenp, loff_t *ppos)
2137{
2138 int op;
2139
91fcd412 2140 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2141 return -EPERM;
2142
2143 op = OP_OR;
2144 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2145 do_proc_dointvec_bset_conv,&op);
2146}
2147
1da177e4
LT		 2148struct do_proc_dointvec_minmax_conv_param {
2149 int *min;
2150 int *max;
2151};
2152
2153static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2154 int *valp,
2155 int write, void *data)
2156{
2157 struct do_proc_dointvec_minmax_conv_param *param = data;
2158 if (write) {
2159 int val = *negp ? -*lvalp : *lvalp;
2160 if ((param->min && *param->min > val) ||
2161 (param->max && *param->max < val))
2162 return -EINVAL;
2163 *valp = val;
2164 } else {
2165 int val = *valp;
2166 if (val < 0) {
2167 *negp = -1;
2168 *lvalp = (unsigned long)-val;
2169 } else {
2170 *negp = 0;
2171 *lvalp = (unsigned long)val;
2172 }
2173 }
2174 return 0;
2175}
2176
2177/**
2178 * proc_dointvec_minmax - read a vector of integers with min/max values
2179 * @table: the sysctl table
2180 * @write: %TRUE if this is a write to the sysctl file
2181 * @filp: the file structure
2182 * @buffer: the user buffer
2183 * @lenp: the size of the user buffer
2184 * @ppos: file position
2185 *
2186 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2187 * values from/to the user buffer, treated as an ASCII string.
2188 *
2189 * This routine will ensure the values are within the range specified by
2190 * table->extra1 (min) and table->extra2 (max).
2191 *
2192 * Returns 0 on success.
2193 */
d8217f07 2194int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2195 void __user *buffer, size_t *lenp, loff_t *ppos)
2196{
2197 struct do_proc_dointvec_minmax_conv_param param = {
2198 .min = (int *) table->extra1,
2199 .max = (int *) table->extra2,
2200 };
2201 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2202 do_proc_dointvec_minmax_conv, &param);
2203}
2204
d8217f07 2205static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2206 struct file *filp,
2207 void __user *buffer,
2208 size_t *lenp, loff_t *ppos,
2209 unsigned long convmul,
2210 unsigned long convdiv)
2211{
2212#define TMPBUFLEN 21
2213 unsigned long *i, *min, *max, val;
2214 int vleft, first=1, neg;
2215 size_t len, left;
2216 char buf[TMPBUFLEN], *p;
2217 char __user *s = buffer;
2218
fcfbd547 2219 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2220 (*ppos && !write)) {
2221 *lenp = 0;
2222 return 0;
2223 }
2224
fcfbd547 2225 i = (unsigned long *) data;
1da177e4
LT		 2226 min = (unsigned long *) table->extra1;
2227 max = (unsigned long *) table->extra2;
2228 vleft = table->maxlen / sizeof(unsigned long);
2229 left = *lenp;
2230
2231 for (; left && vleft--; i++, min++, max++, first=0) {
2232 if (write) {
2233 while (left) {
2234 char c;
2235 if (get_user(c, s))
2236 return -EFAULT;
2237 if (!isspace(c))
2238 break;
2239 left--;
2240 s++;
2241 }
2242 if (!left)
2243 break;
2244 neg = 0;
2245 len = left;
2246 if (len > TMPBUFLEN-1)
2247 len = TMPBUFLEN-1;
2248 if (copy_from_user(buf, s, len))
2249 return -EFAULT;
2250 buf[len] = 0;
2251 p = buf;
2252 if (*p == '-' && left > 1) {
2253 neg = 1;
bd9b0bac 2254 p++;
1da177e4
LT		 2255 }
2256 if (*p < '0' || *p > '9')
2257 break;
2258 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2259 len = p-buf;
2260 if ((len < left) && *p && !isspace(*p))
2261 break;
2262 if (neg)
2263 val = -val;
2264 s += len;
2265 left -= len;
2266
2267 if(neg)
2268 continue;
2269 if ((min && val < *min) || (max && val > *max))
2270 continue;
2271 *i = val;
2272 } else {
2273 p = buf;
2274 if (!first)
2275 *p++ = '\t';
2276 sprintf(p, "%lu", convdiv * (*i) / convmul);
2277 len = strlen(buf);
2278 if (len > left)
2279 len = left;
2280 if(copy_to_user(s, buf, len))
2281 return -EFAULT;
2282 left -= len;
2283 s += len;
2284 }
2285 }
2286
2287 if (!write && !first && left) {
2288 if(put_user('\n', s))
2289 return -EFAULT;
2290 left--, s++;
2291 }
2292 if (write) {
2293 while (left) {
2294 char c;
2295 if (get_user(c, s++))
2296 return -EFAULT;
2297 if (!isspace(c))
2298 break;
2299 left--;
2300 }
2301 }
2302 if (write && first)
2303 return -EINVAL;
2304 *lenp -= left;
2305 *ppos += *lenp;
2306 return 0;
2307#undef TMPBUFLEN
2308}
2309
d8217f07 2310static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2311 struct file *filp,
2312 void __user *buffer,
2313 size_t *lenp, loff_t *ppos,
2314 unsigned long convmul,
2315 unsigned long convdiv)
2316{
2317 return __do_proc_doulongvec_minmax(table->data, table, write,
2318 filp, buffer, lenp, ppos, convmul, convdiv);
2319}
2320
1da177e4
LT		 2321/**
2322 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2323 * @table: the sysctl table
2324 * @write: %TRUE if this is a write to the sysctl file
2325 * @filp: the file structure
2326 * @buffer: the user buffer
2327 * @lenp: the size of the user buffer
2328 * @ppos: file position
2329 *
2330 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2331 * values from/to the user buffer, treated as an ASCII string.
2332 *
2333 * This routine will ensure the values are within the range specified by
2334 * table->extra1 (min) and table->extra2 (max).
2335 *
2336 * Returns 0 on success.
2337 */
d8217f07 2338int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2339 void __user *buffer, size_t *lenp, loff_t *ppos)
2340{
2341 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2342}
2343
2344/**
2345 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2346 * @table: the sysctl table
2347 * @write: %TRUE if this is a write to the sysctl file
2348 * @filp: the file structure
2349 * @buffer: the user buffer
2350 * @lenp: the size of the user buffer
2351 * @ppos: file position
2352 *
2353 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2354 * values from/to the user buffer, treated as an ASCII string. The values
2355 * are treated as milliseconds, and converted to jiffies when they are stored.
2356 *
2357 * This routine will ensure the values are within the range specified by
2358 * table->extra1 (min) and table->extra2 (max).
2359 *
2360 * Returns 0 on success.
2361 */
d8217f07 2362int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2363 struct file *filp,
2364 void __user *buffer,
2365 size_t *lenp, loff_t *ppos)
2366{
2367 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2368 lenp, ppos, HZ, 1000l);
2369}
2370
2371
2372static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2373 int *valp,
2374 int write, void *data)
2375{
2376 if (write) {
cba9f33d
BS		 2377 if (*lvalp > LONG_MAX / HZ)
2378 return 1;
1da177e4
LT		 2379 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2380 } else {
2381 int val = *valp;
2382 unsigned long lval;
2383 if (val < 0) {
2384 *negp = -1;
2385 lval = (unsigned long)-val;
2386 } else {
2387 *negp = 0;
2388 lval = (unsigned long)val;
2389 }
2390 *lvalp = lval / HZ;
2391 }
2392 return 0;
2393}
2394
2395static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2396 int *valp,
2397 int write, void *data)
2398{
2399 if (write) {
cba9f33d
BS		 2400 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2401 return 1;
1da177e4
LT		 2402 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2403 } else {
2404 int val = *valp;
2405 unsigned long lval;
2406 if (val < 0) {
2407 *negp = -1;
2408 lval = (unsigned long)-val;
2409 } else {
2410 *negp = 0;
2411 lval = (unsigned long)val;
2412 }
2413 *lvalp = jiffies_to_clock_t(lval);
2414 }
2415 return 0;
2416}
2417
2418static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2419 int *valp,
2420 int write, void *data)
2421{
2422 if (write) {
2423 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2424 } else {
2425 int val = *valp;
2426 unsigned long lval;
2427 if (val < 0) {
2428 *negp = -1;
2429 lval = (unsigned long)-val;
2430 } else {
2431 *negp = 0;
2432 lval = (unsigned long)val;
2433 }
2434 *lvalp = jiffies_to_msecs(lval);
2435 }
2436 return 0;
2437}
2438
2439/**
2440 * proc_dointvec_jiffies - read a vector of integers as seconds
2441 * @table: the sysctl table
2442 * @write: %TRUE if this is a write to the sysctl file
2443 * @filp: the file structure
2444 * @buffer: the user buffer
2445 * @lenp: the size of the user buffer
2446 * @ppos: file position
2447 *
2448 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2449 * values from/to the user buffer, treated as an ASCII string.
2450 * The values read are assumed to be in seconds, and are converted into
2451 * jiffies.
2452 *
2453 * Returns 0 on success.
2454 */
d8217f07 2455int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2456 void __user *buffer, size_t *lenp, loff_t *ppos)
2457{
2458 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2459 do_proc_dointvec_jiffies_conv,NULL);
2460}
2461
2462/**
2463 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2464 * @table: the sysctl table
2465 * @write: %TRUE if this is a write to the sysctl file
2466 * @filp: the file structure
2467 * @buffer: the user buffer
2468 * @lenp: the size of the user buffer
1e5d5331 2469 * @ppos: pointer to the file position
1da177e4
LT		 2470 *
2471 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2472 * values from/to the user buffer, treated as an ASCII string.
2473 * The values read are assumed to be in 1/USER_HZ seconds, and
2474 * are converted into jiffies.
2475 *
2476 * Returns 0 on success.
2477 */
d8217f07 2478int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2479 void __user *buffer, size_t *lenp, loff_t *ppos)
2480{
2481 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2482 do_proc_dointvec_userhz_jiffies_conv,NULL);
2483}
2484
2485/**
2486 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2487 * @table: the sysctl table
2488 * @write: %TRUE if this is a write to the sysctl file
2489 * @filp: the file structure
2490 * @buffer: the user buffer
2491 * @lenp: the size of the user buffer
67be2dd1
MW		 2492 * @ppos: file position
2493 * @ppos: the current position in the file
1da177e4
LT		 2494 *
2495 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2496 * values from/to the user buffer, treated as an ASCII string.
2497 * The values read are assumed to be in 1/1000 seconds, and
2498 * are converted into jiffies.
2499 *
2500 * Returns 0 on success.
2501 */
d8217f07 2502int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2503 void __user *buffer, size_t *lenp, loff_t *ppos)
2504{
2505 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2506 do_proc_dointvec_ms_jiffies_conv, NULL);
2507}
2508
d8217f07 2509static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2510 void __user *buffer, size_t *lenp, loff_t *ppos)
2511{
2512 struct pid *new_pid;
2513 pid_t tmp;
2514 int r;
2515
6c5f3e7b 2516 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2517
2518 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2519 lenp, ppos, NULL, NULL);
2520 if (r || !write)
2521 return r;
2522
2523 new_pid = find_get_pid(tmp);
2524 if (!new_pid)
2525 return -ESRCH;
2526
2527 put_pid(xchg(&cad_pid, new_pid));
2528 return 0;
2529}
2530
1da177e4
LT		 2531#else /* CONFIG_PROC_FS */
2532
d8217f07 2533int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2534 void __user *buffer, size_t *lenp, loff_t *ppos)
2535{
2536 return -ENOSYS;
2537}
2538
d8217f07 2539int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2540 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2541{
2542 return -ENOSYS;
2543}
2544
d8217f07 2545int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2546 void __user *buffer, size_t *lenp, loff_t *ppos)
2547{
2548 return -ENOSYS;
2549}
2550
d8217f07 2551int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2552 void __user *buffer, size_t *lenp, loff_t *ppos)
2553{
2554 return -ENOSYS;
2555}
2556
d8217f07 2557int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2558 void __user *buffer, size_t *lenp, loff_t *ppos)
2559{
2560 return -ENOSYS;
2561}
2562
d8217f07 2563int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2564 void __user *buffer, size_t *lenp, loff_t *ppos)
2565{
2566 return -ENOSYS;
2567}
2568
d8217f07 2569int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2570 void __user *buffer, size_t *lenp, loff_t *ppos)
2571{
2572 return -ENOSYS;
2573}
2574
d8217f07 2575int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2576 struct file *filp,
2577 void __user *buffer,
2578 size_t *lenp, loff_t *ppos)
2579{
2580 return -ENOSYS;
2581}
2582
2583
2584#endif /* CONFIG_PROC_FS */
2585
2586
b89a8171 2587#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2588/*
2589 * General sysctl support routines
2590 */
2591
49a0c458
EB		 2592/* The generic sysctl data routine (used if no strategy routine supplied) */
2593int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2594 void __user *oldval, size_t __user *oldlenp,
2595 void __user *newval, size_t newlen)
2596{
2597 size_t len;
2598
2599 /* Get out of I don't have a variable */
2600 if (!table->data || !table->maxlen)
2601 return -ENOTDIR;
2602
2603 if (oldval && oldlenp) {
2604 if (get_user(len, oldlenp))
2605 return -EFAULT;
2606 if (len) {
2607 if (len > table->maxlen)
2608 len = table->maxlen;
2609 if (copy_to_user(oldval, table->data, len))
2610 return -EFAULT;
2611 if (put_user(len, oldlenp))
2612 return -EFAULT;
2613 }
2614 }
2615
2616 if (newval && newlen) {
2617 if (newlen > table->maxlen)
2618 newlen = table->maxlen;
2619
2620 if (copy_from_user(table->data, newval, newlen))
2621 return -EFAULT;
2622 }
2623 return 1;
2624}
2625
1da177e4 2626/* The generic string strategy routine: */
d8217f07 2627int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2628 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2629 void __user *newval, size_t newlen)
1da177e4 2630{
1da177e4
LT		 2631 if (!table->data || !table->maxlen)
2632 return -ENOTDIR;
2633
2634 if (oldval && oldlenp) {
de9e007d
LT		 2635 size_t bufsize;
2636 if (get_user(bufsize, oldlenp))
1da177e4 2637 return -EFAULT;
de9e007d
LT		 2638 if (bufsize) {
2639 size_t len = strlen(table->data), copied;
2640
2641 /* This shouldn't trigger for a well-formed sysctl */
2642 if (len > table->maxlen)
1da177e4 2643 len = table->maxlen;
de9e007d
LT		 2644
2645 /* Copy up to a max of bufsize-1 bytes of the string */
2646 copied = (len >= bufsize) ? bufsize - 1 : len;
2647
2648 if (copy_to_user(oldval, table->data, copied) ||
2649 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2650 return -EFAULT;
de9e007d 2651 if (put_user(len, oldlenp))
1da177e4
LT		 2652 return -EFAULT;
2653 }
2654 }
2655 if (newval && newlen) {
de9e007d 2656 size_t len = newlen;
1da177e4
LT		 2657 if (len > table->maxlen)
2658 len = table->maxlen;
2659 if(copy_from_user(table->data, newval, len))
2660 return -EFAULT;
2661 if (len == table->maxlen)
2662 len--;
2663 ((char *) table->data)[len] = 0;
2664 }
82c9df82 2665 return 1;
1da177e4
LT		 2666}
2667
2668/*
2669 * This function makes sure that all of the integers in the vector
2670 * are between the minimum and maximum values given in the arrays
2671 * table->extra1 and table->extra2, respectively.
2672 */
d8217f07 2673int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2674 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2675 void __user *newval, size_t newlen)
1da177e4
LT		 2676{
2677
2678 if (newval && newlen) {
2679 int __user *vec = (int __user *) newval;
2680 int *min = (int *) table->extra1;
2681 int *max = (int *) table->extra2;
2682 size_t length;
2683 int i;
2684
2685 if (newlen % sizeof(int) != 0)
2686 return -EINVAL;
2687
2688 if (!table->extra1 && !table->extra2)
2689 return 0;
2690
2691 if (newlen > table->maxlen)
2692 newlen = table->maxlen;
2693 length = newlen / sizeof(int);
2694
2695 for (i = 0; i < length; i++) {
2696 int value;
2697 if (get_user(value, vec + i))
2698 return -EFAULT;
2699 if (min && value < min[i])
2700 return -EINVAL;
2701 if (max && value > max[i])
2702 return -EINVAL;
2703 }
2704 }
2705 return 0;
2706}
2707
2708/* Strategy function to convert jiffies to seconds */
d8217f07 2709int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2710 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2711 void __user *newval, size_t newlen)
1da177e4 2712{
3ee75ac3 2713 if (oldval && oldlenp) {
1da177e4 2714 size_t olen;
3ee75ac3
AD		 2715
2716 if (get_user(olen, oldlenp))
2717 return -EFAULT;
2718 if (olen) {
2719 int val;
2720
2721 if (olen < sizeof(int))
2722 return -EINVAL;
2723
2724 val = *(int *)(table->data) / HZ;
2725 if (put_user(val, (int __user *)oldval))
2726 return -EFAULT;
2727 if (put_user(sizeof(int), oldlenp))
1da177e4 2728 return -EFAULT;
1da177e4 2729 }
1da177e4
LT		 2730 }
2731 if (newval && newlen) {
2732 int new;
2733 if (newlen != sizeof(int))
2734 return -EINVAL;
2735 if (get_user(new, (int __user *)newval))
2736 return -EFAULT;
2737 *(int *)(table->data) = new*HZ;
2738 }
2739 return 1;
2740}
2741
2742/* Strategy function to convert jiffies to seconds */
d8217f07 2743int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2744 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2745 void __user *newval, size_t newlen)
1da177e4 2746{
3ee75ac3 2747 if (oldval && oldlenp) {
1da177e4 2748 size_t olen;
3ee75ac3
AD		 2749
2750 if (get_user(olen, oldlenp))
2751 return -EFAULT;
2752 if (olen) {
2753 int val;
2754
2755 if (olen < sizeof(int))
2756 return -EINVAL;
2757
2758 val = jiffies_to_msecs(*(int *)(table->data));
2759 if (put_user(val, (int __user *)oldval))
2760 return -EFAULT;
2761 if (put_user(sizeof(int), oldlenp))
1da177e4 2762 return -EFAULT;
1da177e4 2763 }
1da177e4
LT		 2764 }
2765 if (newval && newlen) {
2766 int new;
2767 if (newlen != sizeof(int))
2768 return -EINVAL;
2769 if (get_user(new, (int __user *)newval))
2770 return -EFAULT;
2771 *(int *)(table->data) = msecs_to_jiffies(new);
2772 }
2773 return 1;
2774}
2775
c4b8b769 2776
c4b8b769 2777
b89a8171 2778#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 2779
2780
2781asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2782{
0e009be8 2783 struct __sysctl_args tmp;
7058cb02 2784 int error;
0e009be8 2785
0e009be8
EB		 2786 if (copy_from_user(&tmp, args, sizeof(tmp)))
2787 return -EFAULT;
0e009be8 2788
7058cb02 2789 error = deprecated_sysctl_warning(&tmp);
b89a8171 2790
7058cb02
EB		 2791 /* If no error reading the parameters then just -ENOSYS ... */
2792 if (!error)
2793 error = -ENOSYS;
2794
2795 return error;
1da177e4
LT		 2796}
2797
49a0c458
EB		 2798int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2799 void __user *oldval, size_t __user *oldlenp,
2800 void __user *newval, size_t newlen)
2801{
2802 return -ENOSYS;
2803}
2804
d8217f07 2805int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2806 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2807 void __user *newval, size_t newlen)
1da177e4
LT		 2808{
2809 return -ENOSYS;
2810}
2811
d8217f07 2812int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2813 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2814 void __user *newval, size_t newlen)
1da177e4
LT		 2815{
2816 return -ENOSYS;
2817}
2818
d8217f07 2819int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2820 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2821 void __user *newval, size_t newlen)
1da177e4
LT		 2822{
2823 return -ENOSYS;
2824}
2825
d8217f07 2826int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
1da177e4 2827 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2828 void __user *newval, size_t newlen)
1da177e4
LT		 2829{
2830 return -ENOSYS;
2831}
2832
b89a8171 2833#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 2834
7058cb02
EB		 2835static int deprecated_sysctl_warning(struct __sysctl_args *args)
2836{
2837 static int msg_count;
2838 int name[CTL_MAXNAME];
2839 int i;
2840
6fc48af8
TH		 2841 /* Check args->nlen. */
2842 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2843 return -ENOTDIR;
2844
7058cb02
EB		 2845 /* Read in the sysctl name for better debug message logging */
2846 for (i = 0; i < args->nlen; i++)
2847 if (get_user(name[i], args->name + i))
2848 return -EFAULT;
2849
2850 /* Ignore accesses to kernel.version */
2851 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2852 return 0;
2853
2854 if (msg_count < 5) {
2855 msg_count++;
2856 printk(KERN_INFO
2857 "warning: process `%s' used the deprecated sysctl "
2858 "system call with ", current->comm);
2859 for (i = 0; i < args->nlen; i++)
2860 printk("%d.", name[i]);
2861 printk("\n");
2862 }
2863 return 0;
2864}
2865
1da177e4
LT		 2866/*
2867 * No sense putting this after each symbol definition, twice,
2868 * exception granted :-)
2869 */
2870EXPORT_SYMBOL(proc_dointvec);
2871EXPORT_SYMBOL(proc_dointvec_jiffies);
2872EXPORT_SYMBOL(proc_dointvec_minmax);
2873EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2874EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2875EXPORT_SYMBOL(proc_dostring);
2876EXPORT_SYMBOL(proc_doulongvec_minmax);
2877EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2878EXPORT_SYMBOL(register_sysctl_table);
29e796fd 2879EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 2880EXPORT_SYMBOL(sysctl_intvec);
2881EXPORT_SYMBOL(sysctl_jiffies);
2882EXPORT_SYMBOL(sysctl_ms_jiffies);
2883EXPORT_SYMBOL(sysctl_string);
49a0c458 2884EXPORT_SYMBOL(sysctl_data);
1da177e4 2885EXPORT_SYMBOL(unregister_sysctl_table);
kernel source for telekom puls (alcatel/mediatek)