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perf_counter: powerpc: Implement generalized cache events for POWER processors
[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>
12e22c5e 51#include <linux/slow-work.h>
1ccd1549 52#include <linux/perf_counter.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[];
1da177e4
LT		 79extern int pid_max;
80extern int min_free_kbytes;
1da177e4 81extern int pid_max_min, pid_max_max;
9d0243bc 82extern int sysctl_drop_caches;
8ad4b1fb 83extern int percpu_pagelist_fraction;
bebfa101 84extern int compat_log;
9745512c 85extern int latencytop_enabled;
eceea0b3 86extern int sysctl_nr_open_min, sysctl_nr_open_max;
dd8632a1
PM		 87#ifndef CONFIG_MMU
88extern int sysctl_nr_trim_pages;
89#endif
31a72bce
PM		 90#ifdef CONFIG_RCU_TORTURE_TEST
91extern int rcutorture_runnable;
92#endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
1da177e4 93
c4f3b63f 94/* Constants used for minimum and maximum */
195cf453 95#ifdef CONFIG_DETECT_SOFTLOCKUP
c4f3b63f 96static int sixty = 60;
9383d967 97static int neg_one = -1;
c4f3b63f
RT		 98#endif
99
c4f3b63f 100static int zero;
cd5f9a4c
LT		 101static int __maybe_unused one = 1;
102static int __maybe_unused two = 2;
fc3501d4 103static unsigned long one_ul = 1;
c4f3b63f
RT		 104static int one_hundred = 100;
105
9e4a5bda
AR		 106/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
107static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
c4f3b63f 108
1da177e4
LT		 109/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
110static int maxolduid = 65535;
111static int minolduid;
8ad4b1fb 112static int min_percpu_pagelist_fract = 8;
1da177e4
LT		 113
114static int ngroups_max = NGROUPS_MAX;
115
a1ef5adb 116#ifdef CONFIG_MODULES
1da177e4
LT		 117extern char modprobe_path[];
118#endif
1da177e4
LT		 119#ifdef CONFIG_CHR_DEV_SG
120extern int sg_big_buff;
121#endif
1da177e4 122
72c57ed5 123#ifdef CONFIG_SPARC
17f04fbb 124#include <asm/system.h>
1da177e4
LT		 125#endif
126
0871420f
DM		 127#ifdef CONFIG_SPARC64
128extern int sysctl_tsb_ratio;
129#endif
130
1da177e4
LT		 131#ifdef __hppa__
132extern int pwrsw_enabled;
133extern int unaligned_enabled;
134#endif
135
347a8dc3 136#ifdef CONFIG_S390
1da177e4
LT		 137#ifdef CONFIG_MATHEMU
138extern int sysctl_ieee_emulation_warnings;
139#endif
140extern int sysctl_userprocess_debug;
951f22d5 141extern int spin_retry;
1da177e4
LT		 142#endif
143
1da177e4
LT		 144#ifdef CONFIG_BSD_PROCESS_ACCT
145extern int acct_parm[];
146#endif
147
d2b176ed
JS		 148#ifdef CONFIG_IA64
149extern int no_unaligned_warning;
88fc241f 150extern int unaligned_dump_stack;
d2b176ed
JS		 151#endif
152
23f78d4a
IM		 153#ifdef CONFIG_RT_MUTEXES
154extern int max_lock_depth;
155#endif
156
d6f8ff73 157#ifdef CONFIG_PROC_SYSCTL
d8217f07 158static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099 159 void __user *buffer, size_t *lenp, loff_t *ppos);
25ddbb18 160static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398 161 void __user *buffer, size_t *lenp, loff_t *ppos);
d6f8ff73 162#endif
9ec52099 163
d8217f07 164static struct ctl_table root_table[];
e51b6ba0
EB		 165static struct ctl_table_root sysctl_table_root;
166static struct ctl_table_header root_table_header = {
b380b0d4 167 .count = 1,
e51b6ba0 168 .ctl_table = root_table,
73455092 169 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
e51b6ba0 170 .root = &sysctl_table_root,
73455092 171 .set = &sysctl_table_root.default_set,
e51b6ba0
EB		 172};
173static struct ctl_table_root sysctl_table_root = {
174 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
73455092 175 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
e51b6ba0 176};
1da177e4 177
d8217f07
EB		 178static struct ctl_table kern_table[];
179static struct ctl_table vm_table[];
180static struct ctl_table fs_table[];
181static struct ctl_table debug_table[];
182static struct ctl_table dev_table[];
183extern struct ctl_table random_table[];
2d9048e2 184#ifdef CONFIG_INOTIFY_USER
d8217f07 185extern struct ctl_table inotify_table[];
0399cb08 186#endif
7ef9964e
DL		 187#ifdef CONFIG_EPOLL
188extern struct ctl_table epoll_table[];
189#endif
1da177e4
LT		 190
191#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
192int sysctl_legacy_va_layout;
193#endif
194
f20786ff
PZ		 195extern int prove_locking;
196extern int lock_stat;
9bc9a6bd 197
1da177e4
LT		 198/* The default sysctl tables: */
199
d8217f07 200static struct ctl_table root_table[] = {
1da177e4
LT		 201 {
202 .ctl_name = CTL_KERN,
203 .procname = "kernel",
204 .mode = 0555,
205 .child = kern_table,
206 },
207 {
208 .ctl_name = CTL_VM,
209 .procname = "vm",
210 .mode = 0555,
211 .child = vm_table,
212 },
1da177e4
LT		 213 {
214 .ctl_name = CTL_FS,
215 .procname = "fs",
216 .mode = 0555,
217 .child = fs_table,
218 },
219 {
220 .ctl_name = CTL_DEBUG,
221 .procname = "debug",
222 .mode = 0555,
223 .child = debug_table,
224 },
225 {
226 .ctl_name = CTL_DEV,
227 .procname = "dev",
228 .mode = 0555,
229 .child = dev_table,
230 },
2be7fe07
AM		 231/*
232 * NOTE: do not add new entries to this table unless you have read
233 * Documentation/sysctl/ctl_unnumbered.txt
234 */
1da177e4
LT		 235 { .ctl_name = 0 }
236};
237
77e54a1f 238#ifdef CONFIG_SCHED_DEBUG
73c4efd2
ED		 239static int min_sched_granularity_ns = 100000; /* 100 usecs */
240static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
241static int min_wakeup_granularity_ns; /* 0 usecs */
242static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
77e54a1f
IM		 243#endif
244
d8217f07 245static struct ctl_table kern_table[] = {
77e54a1f
IM		 246#ifdef CONFIG_SCHED_DEBUG
247 {
248 .ctl_name = CTL_UNNUMBERED,
b2be5e96
PZ		 249 .procname = "sched_min_granularity_ns",
250 .data = &sysctl_sched_min_granularity,
77e54a1f
IM		 251 .maxlen = sizeof(unsigned int),
252 .mode = 0644,
b2be5e96
PZ		 253 .proc_handler = &sched_nr_latency_handler,
254 .strategy = &sysctl_intvec,
255 .extra1 = &min_sched_granularity_ns,
256 .extra2 = &max_sched_granularity_ns,
77e54a1f 257 },
21805085
PZ		 258 {
259 .ctl_name = CTL_UNNUMBERED,
260 .procname = "sched_latency_ns",
261 .data = &sysctl_sched_latency,
262 .maxlen = sizeof(unsigned int),
263 .mode = 0644,
b2be5e96 264 .proc_handler = &sched_nr_latency_handler,
21805085
PZ		 265 .strategy = &sysctl_intvec,
266 .extra1 = &min_sched_granularity_ns,
267 .extra2 = &max_sched_granularity_ns,
268 },
77e54a1f
IM		 269 {
270 .ctl_name = CTL_UNNUMBERED,
271 .procname = "sched_wakeup_granularity_ns",
272 .data = &sysctl_sched_wakeup_granularity,
273 .maxlen = sizeof(unsigned int),
274 .mode = 0644,
275 .proc_handler = &proc_dointvec_minmax,
276 .strategy = &sysctl_intvec,
77e54a1f
IM		 277 .extra1 = &min_wakeup_granularity_ns,
278 .extra2 = &max_wakeup_granularity_ns,
279 },
2398f2c6
PZ		 280 {
281 .ctl_name = CTL_UNNUMBERED,
282 .procname = "sched_shares_ratelimit",
283 .data = &sysctl_sched_shares_ratelimit,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = &proc_dointvec,
287 },
ffda12a1
PZ		 288 {
289 .ctl_name = CTL_UNNUMBERED,
290 .procname = "sched_shares_thresh",
291 .data = &sysctl_sched_shares_thresh,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = &proc_dointvec_minmax,
295 .strategy = &sysctl_intvec,
296 .extra1 = &zero,
297 },
77e54a1f
IM		 298 {
299 .ctl_name = CTL_UNNUMBERED,
300 .procname = "sched_child_runs_first",
301 .data = &sysctl_sched_child_runs_first,
302 .maxlen = sizeof(unsigned int),
303 .mode = 0644,
304 .proc_handler = &proc_dointvec,
305 },
1fc84aaa
PZ		 306 {
307 .ctl_name = CTL_UNNUMBERED,
308 .procname = "sched_features",
309 .data = &sysctl_sched_features,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = &proc_dointvec,
313 },
da84d961
IM		 314 {
315 .ctl_name = CTL_UNNUMBERED,
316 .procname = "sched_migration_cost",
317 .data = &sysctl_sched_migration_cost,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = &proc_dointvec,
321 },
b82d9fdd
PZ		 322 {
323 .ctl_name = CTL_UNNUMBERED,
324 .procname = "sched_nr_migrate",
325 .data = &sysctl_sched_nr_migrate,
326 .maxlen = sizeof(unsigned int),
fa85ae24
PZ		 327 .mode = 0644,
328 .proc_handler = &proc_dointvec,
329 },
1fc84aaa 330#endif
9f0c1e56
PZ		 331 {
332 .ctl_name = CTL_UNNUMBERED,
333 .procname = "sched_rt_period_us",
334 .data = &sysctl_sched_rt_period,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
d0b27fa7 337 .proc_handler = &sched_rt_handler,
9f0c1e56
PZ		 338 },
339 {
340 .ctl_name = CTL_UNNUMBERED,
341 .procname = "sched_rt_runtime_us",
342 .data = &sysctl_sched_rt_runtime,
343 .maxlen = sizeof(int),
344 .mode = 0644,
d0b27fa7 345 .proc_handler = &sched_rt_handler,
9f0c1e56 346 },
1799e35d
IM		 347 {
348 .ctl_name = CTL_UNNUMBERED,
349 .procname = "sched_compat_yield",
350 .data = &sysctl_sched_compat_yield,
351 .maxlen = sizeof(unsigned int),
352 .mode = 0644,
353 .proc_handler = &proc_dointvec,
354 },
f20786ff
PZ		 355#ifdef CONFIG_PROVE_LOCKING
356 {
357 .ctl_name = CTL_UNNUMBERED,
358 .procname = "prove_locking",
359 .data = &prove_locking,
360 .maxlen = sizeof(int),
361 .mode = 0644,
362 .proc_handler = &proc_dointvec,
363 },
364#endif
365#ifdef CONFIG_LOCK_STAT
366 {
367 .ctl_name = CTL_UNNUMBERED,
368 .procname = "lock_stat",
369 .data = &lock_stat,
370 .maxlen = sizeof(int),
371 .mode = 0644,
372 .proc_handler = &proc_dointvec,
373 },
77e54a1f 374#endif
1da177e4
LT		 375 {
376 .ctl_name = KERN_PANIC,
377 .procname = "panic",
378 .data = &panic_timeout,
379 .maxlen = sizeof(int),
380 .mode = 0644,
381 .proc_handler = &proc_dointvec,
382 },
383 {
384 .ctl_name = KERN_CORE_USES_PID,
385 .procname = "core_uses_pid",
386 .data = &core_uses_pid,
387 .maxlen = sizeof(int),
388 .mode = 0644,
389 .proc_handler = &proc_dointvec,
390 },
391 {
392 .ctl_name = KERN_CORE_PATTERN,
393 .procname = "core_pattern",
394 .data = core_pattern,
71ce92f3 395 .maxlen = CORENAME_MAX_SIZE,
1da177e4
LT		 396 .mode = 0644,
397 .proc_handler = &proc_dostring,
398 .strategy = &sysctl_string,
399 },
34f5a398 400#ifdef CONFIG_PROC_SYSCTL
1da177e4 401 {
1da177e4 402 .procname = "tainted",
25ddbb18 403 .maxlen = sizeof(long),
34f5a398 404 .mode = 0644,
25ddbb18 405 .proc_handler = &proc_taint,
1da177e4 406 },
34f5a398 407#endif
9745512c
AV		 408#ifdef CONFIG_LATENCYTOP
409 {
410 .procname = "latencytop",
411 .data = &latencytop_enabled,
412 .maxlen = sizeof(int),
413 .mode = 0644,
414 .proc_handler = &proc_dointvec,
415 },
416#endif
1da177e4
LT		 417#ifdef CONFIG_BLK_DEV_INITRD
418 {
419 .ctl_name = KERN_REALROOTDEV,
420 .procname = "real-root-dev",
421 .data = &real_root_dev,
422 .maxlen = sizeof(int),
423 .mode = 0644,
424 .proc_handler = &proc_dointvec,
425 },
426#endif
45807a1d
IM		 427 {
428 .ctl_name = CTL_UNNUMBERED,
429 .procname = "print-fatal-signals",
430 .data = &print_fatal_signals,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = &proc_dointvec,
434 },
72c57ed5 435#ifdef CONFIG_SPARC
1da177e4
LT		 436 {
437 .ctl_name = KERN_SPARC_REBOOT,
438 .procname = "reboot-cmd",
439 .data = reboot_command,
440 .maxlen = 256,
441 .mode = 0644,
442 .proc_handler = &proc_dostring,
443 .strategy = &sysctl_string,
444 },
445 {
446 .ctl_name = KERN_SPARC_STOP_A,
447 .procname = "stop-a",
448 .data = &stop_a_enabled,
449 .maxlen = sizeof (int),
450 .mode = 0644,
451 .proc_handler = &proc_dointvec,
452 },
453 {
454 .ctl_name = KERN_SPARC_SCONS_PWROFF,
455 .procname = "scons-poweroff",
456 .data = &scons_pwroff,
457 .maxlen = sizeof (int),
458 .mode = 0644,
459 .proc_handler = &proc_dointvec,
460 },
461#endif
0871420f
DM		 462#ifdef CONFIG_SPARC64
463 {
464 .ctl_name = CTL_UNNUMBERED,
465 .procname = "tsb-ratio",
466 .data = &sysctl_tsb_ratio,
467 .maxlen = sizeof (int),
468 .mode = 0644,
469 .proc_handler = &proc_dointvec,
470 },
471#endif
1da177e4
LT		 472#ifdef __hppa__
473 {
474 .ctl_name = KERN_HPPA_PWRSW,
475 .procname = "soft-power",
476 .data = &pwrsw_enabled,
477 .maxlen = sizeof (int),
478 .mode = 0644,
479 .proc_handler = &proc_dointvec,
480 },
481 {
482 .ctl_name = KERN_HPPA_UNALIGNED,
483 .procname = "unaligned-trap",
484 .data = &unaligned_enabled,
485 .maxlen = sizeof (int),
486 .mode = 0644,
487 .proc_handler = &proc_dointvec,
488 },
489#endif
490 {
491 .ctl_name = KERN_CTLALTDEL,
492 .procname = "ctrl-alt-del",
493 .data = &C_A_D,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = &proc_dointvec,
497 },
606576ce 498#ifdef CONFIG_FUNCTION_TRACER
b0fc494f
SR		 499 {
500 .ctl_name = CTL_UNNUMBERED,
501 .procname = "ftrace_enabled",
502 .data = &ftrace_enabled,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = &ftrace_enable_sysctl,
506 },
507#endif
f38f1d2a
SR		 508#ifdef CONFIG_STACK_TRACER
509 {
510 .ctl_name = CTL_UNNUMBERED,
511 .procname = "stack_tracer_enabled",
512 .data = &stack_tracer_enabled,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = &stack_trace_sysctl,
516 },
517#endif
944ac425
SR		 518#ifdef CONFIG_TRACING
519 {
520 .ctl_name = CTL_UNNUMBERED,
3299b4dd 521 .procname = "ftrace_dump_on_oops",
944ac425
SR		 522 .data = &ftrace_dump_on_oops,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = &proc_dointvec,
526 },
527#endif
a1ef5adb 528#ifdef CONFIG_MODULES
1da177e4
LT		 529 {
530 .ctl_name = KERN_MODPROBE,
531 .procname = "modprobe",
532 .data = &modprobe_path,
533 .maxlen = KMOD_PATH_LEN,
534 .mode = 0644,
535 .proc_handler = &proc_dostring,
536 .strategy = &sysctl_string,
537 },
538#endif
57ae2508 539#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
1da177e4
LT		 540 {
541 .ctl_name = KERN_HOTPLUG,
542 .procname = "hotplug",
312c004d
KS		 543 .data = &uevent_helper,
544 .maxlen = UEVENT_HELPER_PATH_LEN,
1da177e4
LT		 545 .mode = 0644,
546 .proc_handler = &proc_dostring,
547 .strategy = &sysctl_string,
548 },
549#endif
550#ifdef CONFIG_CHR_DEV_SG
551 {
552 .ctl_name = KERN_SG_BIG_BUFF,
553 .procname = "sg-big-buff",
554 .data = &sg_big_buff,
555 .maxlen = sizeof (int),
556 .mode = 0444,
557 .proc_handler = &proc_dointvec,
558 },
559#endif
560#ifdef CONFIG_BSD_PROCESS_ACCT
561 {
562 .ctl_name = KERN_ACCT,
563 .procname = "acct",
564 .data = &acct_parm,
565 .maxlen = 3*sizeof(int),
566 .mode = 0644,
567 .proc_handler = &proc_dointvec,
568 },
569#endif
1da177e4
LT		 570#ifdef CONFIG_MAGIC_SYSRQ
571 {
572 .ctl_name = KERN_SYSRQ,
573 .procname = "sysrq",
5d6f647f 574 .data = &__sysrq_enabled,
1da177e4
LT		 575 .maxlen = sizeof (int),
576 .mode = 0644,
577 .proc_handler = &proc_dointvec,
578 },
579#endif
d6f8ff73 580#ifdef CONFIG_PROC_SYSCTL
1da177e4 581 {
1da177e4 582 .procname = "cad_pid",
9ec52099 583 .data = NULL,
1da177e4
LT		 584 .maxlen = sizeof (int),
585 .mode = 0600,
9ec52099 586 .proc_handler = &proc_do_cad_pid,
1da177e4 587 },
d6f8ff73 588#endif
1da177e4
LT		 589 {
590 .ctl_name = KERN_MAX_THREADS,
591 .procname = "threads-max",
592 .data = &max_threads,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = &proc_dointvec,
596 },
597 {
598 .ctl_name = KERN_RANDOM,
599 .procname = "random",
600 .mode = 0555,
601 .child = random_table,
602 },
1da177e4
LT		 603 {
604 .ctl_name = KERN_OVERFLOWUID,
605 .procname = "overflowuid",
606 .data = &overflowuid,
607 .maxlen = sizeof(int),
608 .mode = 0644,
609 .proc_handler = &proc_dointvec_minmax,
610 .strategy = &sysctl_intvec,
611 .extra1 = &minolduid,
612 .extra2 = &maxolduid,
613 },
614 {
615 .ctl_name = KERN_OVERFLOWGID,
616 .procname = "overflowgid",
617 .data = &overflowgid,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = &proc_dointvec_minmax,
621 .strategy = &sysctl_intvec,
622 .extra1 = &minolduid,
623 .extra2 = &maxolduid,
624 },
347a8dc3 625#ifdef CONFIG_S390
1da177e4
LT		 626#ifdef CONFIG_MATHEMU
627 {
628 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
629 .procname = "ieee_emulation_warnings",
630 .data = &sysctl_ieee_emulation_warnings,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = &proc_dointvec,
634 },
1da177e4
LT		 635#endif
636 {
637 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
638 .procname = "userprocess_debug",
639 .data = &sysctl_userprocess_debug,
640 .maxlen = sizeof(int),
641 .mode = 0644,
642 .proc_handler = &proc_dointvec,
643 },
644#endif
645 {
646 .ctl_name = KERN_PIDMAX,
647 .procname = "pid_max",
648 .data = &pid_max,
649 .maxlen = sizeof (int),
650 .mode = 0644,
651 .proc_handler = &proc_dointvec_minmax,
652 .strategy = sysctl_intvec,
653 .extra1 = &pid_max_min,
654 .extra2 = &pid_max_max,
655 },
656 {
657 .ctl_name = KERN_PANIC_ON_OOPS,
658 .procname = "panic_on_oops",
659 .data = &panic_on_oops,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = &proc_dointvec,
663 },
7ef3d2fd
JP		 664#if defined CONFIG_PRINTK
665 {
666 .ctl_name = KERN_PRINTK,
667 .procname = "printk",
668 .data = &console_loglevel,
669 .maxlen = 4*sizeof(int),
670 .mode = 0644,
671 .proc_handler = &proc_dointvec,
672 },
1da177e4
LT		 673 {
674 .ctl_name = KERN_PRINTK_RATELIMIT,
675 .procname = "printk_ratelimit",
717115e1 676 .data = &printk_ratelimit_state.interval,
1da177e4
LT		 677 .maxlen = sizeof(int),
678 .mode = 0644,
679 .proc_handler = &proc_dointvec_jiffies,
680 .strategy = &sysctl_jiffies,
681 },
682 {
683 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
684 .procname = "printk_ratelimit_burst",
717115e1 685 .data = &printk_ratelimit_state.burst,
1da177e4
LT		 686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = &proc_dointvec,
689 },
7ef3d2fd 690#endif
1da177e4
LT		 691 {
692 .ctl_name = KERN_NGROUPS_MAX,
693 .procname = "ngroups_max",
694 .data = &ngroups_max,
695 .maxlen = sizeof (int),
696 .mode = 0444,
697 .proc_handler = &proc_dointvec,
698 },
699#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
700 {
701 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
702 .procname = "unknown_nmi_panic",
703 .data = &unknown_nmi_panic,
704 .maxlen = sizeof (int),
705 .mode = 0644,
2fbe7b25 706 .proc_handler = &proc_dointvec,
1da177e4 707 },
407984f1 708 {
407984f1
DZ		 709 .procname = "nmi_watchdog",
710 .data = &nmi_watchdog_enabled,
711 .maxlen = sizeof (int),
712 .mode = 0644,
713 .proc_handler = &proc_nmi_enabled,
1da177e4
LT		 714 },
715#endif
716#if defined(CONFIG_X86)
8da5adda
DZ		 717 {
718 .ctl_name = KERN_PANIC_ON_NMI,
719 .procname = "panic_on_unrecovered_nmi",
720 .data = &panic_on_unrecovered_nmi,
721 .maxlen = sizeof(int),
722 .mode = 0644,
723 .proc_handler = &proc_dointvec,
724 },
1da177e4
LT		 725 {
726 .ctl_name = KERN_BOOTLOADER_TYPE,
727 .procname = "bootloader_type",
728 .data = &bootloader_type,
729 .maxlen = sizeof (int),
730 .mode = 0444,
731 .proc_handler = &proc_dointvec,
732 },
0741f4d2
CE		 733 {
734 .ctl_name = CTL_UNNUMBERED,
735 .procname = "kstack_depth_to_print",
736 .data = &kstack_depth_to_print,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = &proc_dointvec,
740 },
6e7c4025
IM		 741 {
742 .ctl_name = CTL_UNNUMBERED,
743 .procname = "io_delay_type",
744 .data = &io_delay_type,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = &proc_dointvec,
748 },
1da177e4 749#endif
7a9166e3 750#if defined(CONFIG_MMU)
1da177e4
LT		 751 {
752 .ctl_name = KERN_RANDOMIZE,
753 .procname = "randomize_va_space",
754 .data = &randomize_va_space,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = &proc_dointvec,
758 },
7a9166e3 759#endif
0152fb37 760#if defined(CONFIG_S390) && defined(CONFIG_SMP)
951f22d5
MS		 761 {
762 .ctl_name = KERN_SPIN_RETRY,
763 .procname = "spin_retry",
764 .data = &spin_retry,
765 .maxlen = sizeof (int),
766 .mode = 0644,
767 .proc_handler = &proc_dointvec,
768 },
c255d844 769#endif
673d5b43 770#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
c255d844 771 {
c255d844 772 .procname = "acpi_video_flags",
77afcf78 773 .data = &acpi_realmode_flags,
c255d844
PM		 774 .maxlen = sizeof (unsigned long),
775 .mode = 0644,
7f99f06f 776 .proc_handler = &proc_doulongvec_minmax,
c255d844 777 },
d2b176ed
JS		 778#endif
779#ifdef CONFIG_IA64
780 {
781 .ctl_name = KERN_IA64_UNALIGNED,
782 .procname = "ignore-unaligned-usertrap",
783 .data = &no_unaligned_warning,
784 .maxlen = sizeof (int),
785 .mode = 0644,
786 .proc_handler = &proc_dointvec,
787 },
88fc241f
DC		 788 {
789 .ctl_name = CTL_UNNUMBERED,
790 .procname = "unaligned-dump-stack",
791 .data = &unaligned_dump_stack,
792 .maxlen = sizeof (int),
793 .mode = 0644,
794 .proc_handler = &proc_dointvec,
795 },
bebfa101 796#endif
c4f3b63f 797#ifdef CONFIG_DETECT_SOFTLOCKUP
9c44bc03
IM		 798 {
799 .ctl_name = CTL_UNNUMBERED,
800 .procname = "softlockup_panic",
801 .data = &softlockup_panic,
802 .maxlen = sizeof(int),
803 .mode = 0644,
4dca10a9 804 .proc_handler = &proc_dointvec_minmax,
9c44bc03
IM		 805 .strategy = &sysctl_intvec,
806 .extra1 = &zero,
807 .extra2 = &one,
808 },
c4f3b63f
RT		 809 {
810 .ctl_name = CTL_UNNUMBERED,
811 .procname = "softlockup_thresh",
812 .data = &softlockup_thresh,
9383d967 813 .maxlen = sizeof(int),
c4f3b63f 814 .mode = 0644,
baf48f65 815 .proc_handler = &proc_dosoftlockup_thresh,
c4f3b63f 816 .strategy = &sysctl_intvec,
9383d967 817 .extra1 = &neg_one,
c4f3b63f
RT		 818 .extra2 = &sixty,
819 },
e162b39a
MSB		 820#endif
821#ifdef CONFIG_DETECT_HUNG_TASK
822 {
823 .ctl_name = CTL_UNNUMBERED,
824 .procname = "hung_task_panic",
825 .data = &sysctl_hung_task_panic,
826 .maxlen = sizeof(int),
827 .mode = 0644,
828 .proc_handler = &proc_dointvec_minmax,
829 .strategy = &sysctl_intvec,
830 .extra1 = &zero,
831 .extra2 = &one,
832 },
82a1fcb9
IM		 833 {
834 .ctl_name = CTL_UNNUMBERED,
835 .procname = "hung_task_check_count",
836 .data = &sysctl_hung_task_check_count,
90739081 837 .maxlen = sizeof(unsigned long),
82a1fcb9 838 .mode = 0644,
90739081 839 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 840 .strategy = &sysctl_intvec,
841 },
842 {
843 .ctl_name = CTL_UNNUMBERED,
844 .procname = "hung_task_timeout_secs",
845 .data = &sysctl_hung_task_timeout_secs,
90739081 846 .maxlen = sizeof(unsigned long),
82a1fcb9 847 .mode = 0644,
e162b39a 848 .proc_handler = &proc_dohung_task_timeout_secs,
82a1fcb9
IM		 849 .strategy = &sysctl_intvec,
850 },
851 {
852 .ctl_name = CTL_UNNUMBERED,
853 .procname = "hung_task_warnings",
854 .data = &sysctl_hung_task_warnings,
90739081 855 .maxlen = sizeof(unsigned long),
82a1fcb9 856 .mode = 0644,
90739081 857 .proc_handler = &proc_doulongvec_minmax,
82a1fcb9
IM		 858 .strategy = &sysctl_intvec,
859 },
c4f3b63f 860#endif
bebfa101
AK		 861#ifdef CONFIG_COMPAT
862 {
863 .ctl_name = KERN_COMPAT_LOG,
864 .procname = "compat-log",
865 .data = &compat_log,
866 .maxlen = sizeof (int),
867 .mode = 0644,
868 .proc_handler = &proc_dointvec,
869 },
951f22d5 870#endif
23f78d4a
IM		 871#ifdef CONFIG_RT_MUTEXES
872 {
873 .ctl_name = KERN_MAX_LOCK_DEPTH,
874 .procname = "max_lock_depth",
875 .data = &max_lock_depth,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = &proc_dointvec,
879 },
5096add8 880#endif
10a0a8d4
JF		 881 {
882 .ctl_name = CTL_UNNUMBERED,
883 .procname = "poweroff_cmd",
884 .data = &poweroff_cmd,
885 .maxlen = POWEROFF_CMD_PATH_LEN,
886 .mode = 0644,
887 .proc_handler = &proc_dostring,
888 .strategy = &sysctl_string,
889 },
0b77f5bf
DH		 890#ifdef CONFIG_KEYS
891 {
892 .ctl_name = CTL_UNNUMBERED,
893 .procname = "keys",
894 .mode = 0555,
895 .child = key_sysctls,
896 },
897#endif
31a72bce
PM		 898#ifdef CONFIG_RCU_TORTURE_TEST
899 {
900 .ctl_name = CTL_UNNUMBERED,
901 .procname = "rcutorture_runnable",
902 .data = &rcutorture_runnable,
903 .maxlen = sizeof(int),
904 .mode = 0644,
905 .proc_handler = &proc_dointvec,
906 },
907#endif
12e22c5e
DH		 908#ifdef CONFIG_SLOW_WORK
909 {
910 .ctl_name = CTL_UNNUMBERED,
911 .procname = "slow-work",
912 .mode = 0555,
913 .child = slow_work_sysctls,
914 },
915#endif
1ccd1549
PZ		 916#ifdef CONFIG_PERF_COUNTERS
917 {
918 .ctl_name = CTL_UNNUMBERED,
919 .procname = "perf_counter_privileged",
920 .data = &sysctl_perf_counter_priv,
921 .maxlen = sizeof(sysctl_perf_counter_priv),
922 .mode = 0644,
923 .proc_handler = &proc_dointvec,
924 },
c5078f78
PZ		 925 {
926 .ctl_name = CTL_UNNUMBERED,
927 .procname = "perf_counter_mlock_kb",
928 .data = &sysctl_perf_counter_mlock,
929 .maxlen = sizeof(sysctl_perf_counter_mlock),
930 .mode = 0644,
931 .proc_handler = &proc_dointvec,
932 },
a78ac325
PZ		 933 {
934 .ctl_name = CTL_UNNUMBERED,
935 .procname = "perf_counter_int_limit",
936 .data = &sysctl_perf_counter_limit,
937 .maxlen = sizeof(sysctl_perf_counter_limit),
938 .mode = 0644,
939 .proc_handler = &proc_dointvec,
940 },
1ccd1549 941#endif
ed2c12f3
AM		 942/*
943 * NOTE: do not add new entries to this table unless you have read
944 * Documentation/sysctl/ctl_unnumbered.txt
945 */
1da177e4
LT		 946 { .ctl_name = 0 }
947};
948
d8217f07 949static struct ctl_table vm_table[] = {
1da177e4
LT		 950 {
951 .ctl_name = VM_OVERCOMMIT_MEMORY,
952 .procname = "overcommit_memory",
953 .data = &sysctl_overcommit_memory,
954 .maxlen = sizeof(sysctl_overcommit_memory),
955 .mode = 0644,
956 .proc_handler = &proc_dointvec,
957 },
fadd8fbd
KH		 958 {
959 .ctl_name = VM_PANIC_ON_OOM,
960 .procname = "panic_on_oom",
961 .data = &sysctl_panic_on_oom,
962 .maxlen = sizeof(sysctl_panic_on_oom),
963 .mode = 0644,
964 .proc_handler = &proc_dointvec,
965 },
fe071d7e
DR		 966 {
967 .ctl_name = CTL_UNNUMBERED,
968 .procname = "oom_kill_allocating_task",
969 .data = &sysctl_oom_kill_allocating_task,
970 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
971 .mode = 0644,
972 .proc_handler = &proc_dointvec,
973 },
fef1bdd6
DR		 974 {
975 .ctl_name = CTL_UNNUMBERED,
976 .procname = "oom_dump_tasks",
977 .data = &sysctl_oom_dump_tasks,
978 .maxlen = sizeof(sysctl_oom_dump_tasks),
979 .mode = 0644,
980 .proc_handler = &proc_dointvec,
981 },
1da177e4
LT		 982 {
983 .ctl_name = VM_OVERCOMMIT_RATIO,
984 .procname = "overcommit_ratio",
985 .data = &sysctl_overcommit_ratio,
986 .maxlen = sizeof(sysctl_overcommit_ratio),
987 .mode = 0644,
988 .proc_handler = &proc_dointvec,
989 },
990 {
991 .ctl_name = VM_PAGE_CLUSTER,
992 .procname = "page-cluster",
993 .data = &page_cluster,
994 .maxlen = sizeof(int),
995 .mode = 0644,
996 .proc_handler = &proc_dointvec,
997 },
998 {
999 .ctl_name = VM_DIRTY_BACKGROUND,
1000 .procname = "dirty_background_ratio",
1001 .data = &dirty_background_ratio,
1002 .maxlen = sizeof(dirty_background_ratio),
1003 .mode = 0644,
2da02997 1004 .proc_handler = &dirty_background_ratio_handler,
1da177e4
LT		 1005 .strategy = &sysctl_intvec,
1006 .extra1 = &zero,
1007 .extra2 = &one_hundred,
1008 },
2da02997
DR		 1009 {
1010 .ctl_name = CTL_UNNUMBERED,
1011 .procname = "dirty_background_bytes",
1012 .data = &dirty_background_bytes,
1013 .maxlen = sizeof(dirty_background_bytes),
1014 .mode = 0644,
1015 .proc_handler = &dirty_background_bytes_handler,
1016 .strategy = &sysctl_intvec,
fc3501d4 1017 .extra1 = &one_ul,
2da02997 1018 },
1da177e4
LT		 1019 {
1020 .ctl_name = VM_DIRTY_RATIO,
1021 .procname = "dirty_ratio",
1022 .data = &vm_dirty_ratio,
1023 .maxlen = sizeof(vm_dirty_ratio),
1024 .mode = 0644,
04fbfdc1 1025 .proc_handler = &dirty_ratio_handler,
1da177e4
LT		 1026 .strategy = &sysctl_intvec,
1027 .extra1 = &zero,
1028 .extra2 = &one_hundred,
1029 },
2da02997
DR		 1030 {
1031 .ctl_name = CTL_UNNUMBERED,
1032 .procname = "dirty_bytes",
1033 .data = &vm_dirty_bytes,
1034 .maxlen = sizeof(vm_dirty_bytes),
1035 .mode = 0644,
1036 .proc_handler = &dirty_bytes_handler,
1037 .strategy = &sysctl_intvec,
9e4a5bda 1038 .extra1 = &dirty_bytes_min,
2da02997 1039 },
1da177e4 1040 {
1da177e4 1041 .procname = "dirty_writeback_centisecs",
f6ef9438
BS		 1042 .data = &dirty_writeback_interval,
1043 .maxlen = sizeof(dirty_writeback_interval),
1da177e4
LT		 1044 .mode = 0644,
1045 .proc_handler = &dirty_writeback_centisecs_handler,
1046 },
1047 {
1da177e4 1048 .procname = "dirty_expire_centisecs",
f6ef9438
BS		 1049 .data = &dirty_expire_interval,
1050 .maxlen = sizeof(dirty_expire_interval),
1da177e4 1051 .mode = 0644,
704503d8 1052 .proc_handler = &proc_dointvec,
1da177e4
LT		 1053 },
1054 {
1055 .ctl_name = VM_NR_PDFLUSH_THREADS,
1056 .procname = "nr_pdflush_threads",
1057 .data = &nr_pdflush_threads,
1058 .maxlen = sizeof nr_pdflush_threads,
1059 .mode = 0444 /* read-only*/,
1060 .proc_handler = &proc_dointvec,
1061 },
1062 {
1063 .ctl_name = VM_SWAPPINESS,
1064 .procname = "swappiness",
1065 .data = &vm_swappiness,
1066 .maxlen = sizeof(vm_swappiness),
1067 .mode = 0644,
1068 .proc_handler = &proc_dointvec_minmax,
1069 .strategy = &sysctl_intvec,
1070 .extra1 = &zero,
1071 .extra2 = &one_hundred,
1072 },
1073#ifdef CONFIG_HUGETLB_PAGE
1074 {
1da177e4 1075 .procname = "nr_hugepages",
e5ff2159 1076 .data = NULL,
1da177e4
LT		 1077 .maxlen = sizeof(unsigned long),
1078 .mode = 0644,
1079 .proc_handler = &hugetlb_sysctl_handler,
1080 .extra1 = (void *)&hugetlb_zero,
1081 .extra2 = (void *)&hugetlb_infinity,
1082 },
1083 {
1084 .ctl_name = VM_HUGETLB_GROUP,
1085 .procname = "hugetlb_shm_group",
1086 .data = &sysctl_hugetlb_shm_group,
1087 .maxlen = sizeof(gid_t),
1088 .mode = 0644,
1089 .proc_handler = &proc_dointvec,
1090 },
396faf03
MG		 1091 {
1092 .ctl_name = CTL_UNNUMBERED,
1093 .procname = "hugepages_treat_as_movable",
1094 .data = &hugepages_treat_as_movable,
1095 .maxlen = sizeof(int),
1096 .mode = 0644,
1097 .proc_handler = &hugetlb_treat_movable_handler,
1098 },
d1c3fb1f
NA		 1099 {
1100 .ctl_name = CTL_UNNUMBERED,
1101 .procname = "nr_overcommit_hugepages",
e5ff2159
AK		 1102 .data = NULL,
1103 .maxlen = sizeof(unsigned long),
d1c3fb1f 1104 .mode = 0644,
a3d0c6aa 1105 .proc_handler = &hugetlb_overcommit_handler,
e5ff2159
AK		 1106 .extra1 = (void *)&hugetlb_zero,
1107 .extra2 = (void *)&hugetlb_infinity,
d1c3fb1f 1108 },
1da177e4
LT		 1109#endif
1110 {
1111 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
1112 .procname = "lowmem_reserve_ratio",
1113 .data = &sysctl_lowmem_reserve_ratio,
1114 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1115 .mode = 0644,
1116 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
1117 .strategy = &sysctl_intvec,
1118 },
9d0243bc
AM		 1119 {
1120 .ctl_name = VM_DROP_PAGECACHE,
1121 .procname = "drop_caches",
1122 .data = &sysctl_drop_caches,
1123 .maxlen = sizeof(int),
1124 .mode = 0644,
1125 .proc_handler = drop_caches_sysctl_handler,
1126 .strategy = &sysctl_intvec,
1127 },
1da177e4
LT		 1128 {
1129 .ctl_name = VM_MIN_FREE_KBYTES,
1130 .procname = "min_free_kbytes",
1131 .data = &min_free_kbytes,
1132 .maxlen = sizeof(min_free_kbytes),
1133 .mode = 0644,
1134 .proc_handler = &min_free_kbytes_sysctl_handler,
1135 .strategy = &sysctl_intvec,
1136 .extra1 = &zero,
1137 },
8ad4b1fb
RS		 1138 {
1139 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1140 .procname = "percpu_pagelist_fraction",
1141 .data = &percpu_pagelist_fraction,
1142 .maxlen = sizeof(percpu_pagelist_fraction),
1143 .mode = 0644,
1144 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1145 .strategy = &sysctl_intvec,
1146 .extra1 = &min_percpu_pagelist_fract,
1147 },
1da177e4
LT		 1148#ifdef CONFIG_MMU
1149 {
1150 .ctl_name = VM_MAX_MAP_COUNT,
1151 .procname = "max_map_count",
1152 .data = &sysctl_max_map_count,
1153 .maxlen = sizeof(sysctl_max_map_count),
1154 .mode = 0644,
1155 .proc_handler = &proc_dointvec
1156 },
dd8632a1
PM		 1157#else
1158 {
1159 .ctl_name = CTL_UNNUMBERED,
1160 .procname = "nr_trim_pages",
1161 .data = &sysctl_nr_trim_pages,
1162 .maxlen = sizeof(sysctl_nr_trim_pages),
1163 .mode = 0644,
1164 .proc_handler = &proc_dointvec_minmax,
1165 .strategy = &sysctl_intvec,
1166 .extra1 = &zero,
1167 },
1da177e4
LT		 1168#endif
1169 {
1170 .ctl_name = VM_LAPTOP_MODE,
1171 .procname = "laptop_mode",
1172 .data = &laptop_mode,
1173 .maxlen = sizeof(laptop_mode),
1174 .mode = 0644,
ed5b43f1
BS		 1175 .proc_handler = &proc_dointvec_jiffies,
1176 .strategy = &sysctl_jiffies,
1da177e4
LT		 1177 },
1178 {
1179 .ctl_name = VM_BLOCK_DUMP,
1180 .procname = "block_dump",
1181 .data = &block_dump,
1182 .maxlen = sizeof(block_dump),
1183 .mode = 0644,
1184 .proc_handler = &proc_dointvec,
1185 .strategy = &sysctl_intvec,
1186 .extra1 = &zero,
1187 },
1188 {
1189 .ctl_name = VM_VFS_CACHE_PRESSURE,
1190 .procname = "vfs_cache_pressure",
1191 .data = &sysctl_vfs_cache_pressure,
1192 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1193 .mode = 0644,
1194 .proc_handler = &proc_dointvec,
1195 .strategy = &sysctl_intvec,
1196 .extra1 = &zero,
1197 },
1198#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1199 {
1200 .ctl_name = VM_LEGACY_VA_LAYOUT,
1201 .procname = "legacy_va_layout",
1202 .data = &sysctl_legacy_va_layout,
1203 .maxlen = sizeof(sysctl_legacy_va_layout),
1204 .mode = 0644,
1205 .proc_handler = &proc_dointvec,
1206 .strategy = &sysctl_intvec,
1207 .extra1 = &zero,
1208 },
1209#endif
1743660b
CL		 1210#ifdef CONFIG_NUMA
1211 {
1212 .ctl_name = VM_ZONE_RECLAIM_MODE,
1213 .procname = "zone_reclaim_mode",
1214 .data = &zone_reclaim_mode,
1215 .maxlen = sizeof(zone_reclaim_mode),
1216 .mode = 0644,
1217 .proc_handler = &proc_dointvec,
c84db23c
CL		 1218 .strategy = &sysctl_intvec,
1219 .extra1 = &zero,
1743660b 1220 },
9614634f
CL		 1221 {
1222 .ctl_name = VM_MIN_UNMAPPED,
1223 .procname = "min_unmapped_ratio",
1224 .data = &sysctl_min_unmapped_ratio,
1225 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1226 .mode = 0644,
1227 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1228 .strategy = &sysctl_intvec,
1229 .extra1 = &zero,
1230 .extra2 = &one_hundred,
1231 },
0ff38490
CL		 1232 {
1233 .ctl_name = VM_MIN_SLAB,
1234 .procname = "min_slab_ratio",
1235 .data = &sysctl_min_slab_ratio,
1236 .maxlen = sizeof(sysctl_min_slab_ratio),
1237 .mode = 0644,
1238 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1239 .strategy = &sysctl_intvec,
1240 .extra1 = &zero,
1241 .extra2 = &one_hundred,
1242 },
e6e5494c 1243#endif
77461ab3
CL		 1244#ifdef CONFIG_SMP
1245 {
1246 .ctl_name = CTL_UNNUMBERED,
1247 .procname = "stat_interval",
1248 .data = &sysctl_stat_interval,
1249 .maxlen = sizeof(sysctl_stat_interval),
1250 .mode = 0644,
1251 .proc_handler = &proc_dointvec_jiffies,
1252 .strategy = &sysctl_jiffies,
1253 },
1254#endif
ed032189
EP		 1255#ifdef CONFIG_SECURITY
1256 {
1257 .ctl_name = CTL_UNNUMBERED,
1258 .procname = "mmap_min_addr",
1259 .data = &mmap_min_addr,
1260 .maxlen = sizeof(unsigned long),
1261 .mode = 0644,
1262 .proc_handler = &proc_doulongvec_minmax,
1263 },
8daec965 1264#endif
f0c0b2b8
KH		 1265#ifdef CONFIG_NUMA
1266 {
1267 .ctl_name = CTL_UNNUMBERED,
1268 .procname = "numa_zonelist_order",
1269 .data = &numa_zonelist_order,
1270 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1271 .mode = 0644,
1272 .proc_handler = &numa_zonelist_order_handler,
1273 .strategy = &sysctl_string,
1274 },
1275#endif
2b8232ce 1276#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
5c36e657 1277 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
e6e5494c
IM		 1278 {
1279 .ctl_name = VM_VDSO_ENABLED,
1280 .procname = "vdso_enabled",
1281 .data = &vdso_enabled,
1282 .maxlen = sizeof(vdso_enabled),
1283 .mode = 0644,
1284 .proc_handler = &proc_dointvec,
1285 .strategy = &sysctl_intvec,
1286 .extra1 = &zero,
1287 },
1da177e4 1288#endif
195cf453
BG		 1289#ifdef CONFIG_HIGHMEM
1290 {
1291 .ctl_name = CTL_UNNUMBERED,
1292 .procname = "highmem_is_dirtyable",
1293 .data = &vm_highmem_is_dirtyable,
1294 .maxlen = sizeof(vm_highmem_is_dirtyable),
1295 .mode = 0644,
1296 .proc_handler = &proc_dointvec_minmax,
1297 .strategy = &sysctl_intvec,
1298 .extra1 = &zero,
1299 .extra2 = &one,
1300 },
1301#endif
4be6f6bb
PZ		 1302#ifdef CONFIG_UNEVICTABLE_LRU
1303 {
1304 .ctl_name = CTL_UNNUMBERED,
1305 .procname = "scan_unevictable_pages",
1306 .data = &scan_unevictable_pages,
1307 .maxlen = sizeof(scan_unevictable_pages),
1308 .mode = 0644,
1309 .proc_handler = &scan_unevictable_handler,
1310 },
1311#endif
2be7fe07
AM		 1312/*
1313 * NOTE: do not add new entries to this table unless you have read
1314 * Documentation/sysctl/ctl_unnumbered.txt
1315 */
1da177e4
LT		 1316 { .ctl_name = 0 }
1317};
1318
2abc26fc 1319#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
d8217f07 1320static struct ctl_table binfmt_misc_table[] = {
2abc26fc
EB		 1321 { .ctl_name = 0 }
1322};
1323#endif
1324
d8217f07 1325static struct ctl_table fs_table[] = {
1da177e4
LT		 1326 {
1327 .ctl_name = FS_NRINODE,
1328 .procname = "inode-nr",
1329 .data = &inodes_stat,
1330 .maxlen = 2*sizeof(int),
1331 .mode = 0444,
1332 .proc_handler = &proc_dointvec,
1333 },
1334 {
1335 .ctl_name = FS_STATINODE,
1336 .procname = "inode-state",
1337 .data = &inodes_stat,
1338 .maxlen = 7*sizeof(int),
1339 .mode = 0444,
1340 .proc_handler = &proc_dointvec,
1341 },
1342 {
1da177e4
LT		 1343 .procname = "file-nr",
1344 .data = &files_stat,
1345 .maxlen = 3*sizeof(int),
1346 .mode = 0444,
529bf6be 1347 .proc_handler = &proc_nr_files,
1da177e4
LT		 1348 },
1349 {
1350 .ctl_name = FS_MAXFILE,
1351 .procname = "file-max",
1352 .data = &files_stat.max_files,
1353 .maxlen = sizeof(int),
1354 .mode = 0644,
1355 .proc_handler = &proc_dointvec,
1356 },
9cfe015a
ED		 1357 {
1358 .ctl_name = CTL_UNNUMBERED,
1359 .procname = "nr_open",
1360 .data = &sysctl_nr_open,
1361 .maxlen = sizeof(int),
1362 .mode = 0644,
eceea0b3
AV		 1363 .proc_handler = &proc_dointvec_minmax,
1364 .extra1 = &sysctl_nr_open_min,
1365 .extra2 = &sysctl_nr_open_max,
9cfe015a 1366 },
1da177e4
LT		 1367 {
1368 .ctl_name = FS_DENTRY,
1369 .procname = "dentry-state",
1370 .data = &dentry_stat,
1371 .maxlen = 6*sizeof(int),
1372 .mode = 0444,
1373 .proc_handler = &proc_dointvec,
1374 },
1375 {
1376 .ctl_name = FS_OVERFLOWUID,
1377 .procname = "overflowuid",
1378 .data = &fs_overflowuid,
1379 .maxlen = sizeof(int),
1380 .mode = 0644,
1381 .proc_handler = &proc_dointvec_minmax,
1382 .strategy = &sysctl_intvec,
1383 .extra1 = &minolduid,
1384 .extra2 = &maxolduid,
1385 },
1386 {
1387 .ctl_name = FS_OVERFLOWGID,
1388 .procname = "overflowgid",
1389 .data = &fs_overflowgid,
1390 .maxlen = sizeof(int),
1391 .mode = 0644,
1392 .proc_handler = &proc_dointvec_minmax,
1393 .strategy = &sysctl_intvec,
1394 .extra1 = &minolduid,
1395 .extra2 = &maxolduid,
1396 },
bfcd17a6 1397#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1398 {
1399 .ctl_name = FS_LEASES,
1400 .procname = "leases-enable",
1401 .data = &leases_enable,
1402 .maxlen = sizeof(int),
1403 .mode = 0644,
1404 .proc_handler = &proc_dointvec,
1405 },
bfcd17a6 1406#endif
1da177e4
LT		 1407#ifdef CONFIG_DNOTIFY
1408 {
1409 .ctl_name = FS_DIR_NOTIFY,
1410 .procname = "dir-notify-enable",
1411 .data = &dir_notify_enable,
1412 .maxlen = sizeof(int),
1413 .mode = 0644,
1414 .proc_handler = &proc_dointvec,
1415 },
1416#endif
1417#ifdef CONFIG_MMU
bfcd17a6 1418#ifdef CONFIG_FILE_LOCKING
1da177e4
LT		 1419 {
1420 .ctl_name = FS_LEASE_TIME,
1421 .procname = "lease-break-time",
1422 .data = &lease_break_time,
1423 .maxlen = sizeof(int),
1424 .mode = 0644,
8e654fba 1425 .proc_handler = &proc_dointvec,
1da177e4 1426 },
bfcd17a6 1427#endif
ebf3f09c 1428#ifdef CONFIG_AIO
1da177e4 1429 {
1da177e4
LT		 1430 .procname = "aio-nr",
1431 .data = &aio_nr,
1432 .maxlen = sizeof(aio_nr),
1433 .mode = 0444,
d55b5fda 1434 .proc_handler = &proc_doulongvec_minmax,
1da177e4
LT		 1435 },
1436 {
1da177e4
LT		 1437 .procname = "aio-max-nr",
1438 .data = &aio_max_nr,
1439 .maxlen = sizeof(aio_max_nr),
1440 .mode = 0644,
d55b5fda 1441 .proc_handler = &proc_doulongvec_minmax,
1da177e4 1442 },
ebf3f09c 1443#endif /* CONFIG_AIO */
2d9048e2 1444#ifdef CONFIG_INOTIFY_USER
0399cb08
RL		 1445 {
1446 .ctl_name = FS_INOTIFY,
1447 .procname = "inotify",
1448 .mode = 0555,
1449 .child = inotify_table,
1450 },
1451#endif
7ef9964e
DL		 1452#ifdef CONFIG_EPOLL
1453 {
1454 .procname = "epoll",
1455 .mode = 0555,
1456 .child = epoll_table,
1457 },
1458#endif
1da177e4 1459#endif
d6e71144
AC		 1460 {
1461 .ctl_name = KERN_SETUID_DUMPABLE,
1462 .procname = "suid_dumpable",
1463 .data = &suid_dumpable,
1464 .maxlen = sizeof(int),
1465 .mode = 0644,
8e654fba
MW		 1466 .proc_handler = &proc_dointvec_minmax,
1467 .strategy = &sysctl_intvec,
1468 .extra1 = &zero,
1469 .extra2 = &two,
d6e71144 1470 },
2abc26fc
EB		 1471#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1472 {
1473 .ctl_name = CTL_UNNUMBERED,
1474 .procname = "binfmt_misc",
1475 .mode = 0555,
1476 .child = binfmt_misc_table,
1477 },
1478#endif
2be7fe07
AM		 1479/*
1480 * NOTE: do not add new entries to this table unless you have read
1481 * Documentation/sysctl/ctl_unnumbered.txt
2be7fe07 1482 */
1da177e4
LT		 1483 { .ctl_name = 0 }
1484};
1485
d8217f07 1486static struct ctl_table debug_table[] = {
d0c3d534 1487#if defined(CONFIG_X86) || defined(CONFIG_PPC)
abd4f750
MAS		 1488 {
1489 .ctl_name = CTL_UNNUMBERED,
1490 .procname = "exception-trace",
1491 .data = &show_unhandled_signals,
1492 .maxlen = sizeof(int),
1493 .mode = 0644,
1494 .proc_handler = proc_dointvec
1495 },
1496#endif
1da177e4
LT		 1497 { .ctl_name = 0 }
1498};
1499
d8217f07 1500static struct ctl_table dev_table[] = {
1da177e4 1501 { .ctl_name = 0 }
0eeca283 1502};
1da177e4 1503
330d57fb
AV		 1504static DEFINE_SPINLOCK(sysctl_lock);
1505
1506/* called under sysctl_lock */
1507static int use_table(struct ctl_table_header *p)
1508{
1509 if (unlikely(p->unregistering))
1510 return 0;
1511 p->used++;
1512 return 1;
1513}
1514
1515/* called under sysctl_lock */
1516static void unuse_table(struct ctl_table_header *p)
1517{
1518 if (!--p->used)
1519 if (unlikely(p->unregistering))
1520 complete(p->unregistering);
1521}
1522
1523/* called under sysctl_lock, will reacquire if has to wait */
1524static void start_unregistering(struct ctl_table_header *p)
1525{
1526 /*
1527 * if p->used is 0, nobody will ever touch that entry again;
1528 * we'll eliminate all paths to it before dropping sysctl_lock
1529 */
1530 if (unlikely(p->used)) {
1531 struct completion wait;
1532 init_completion(&wait);
1533 p->unregistering = &wait;
1534 spin_unlock(&sysctl_lock);
1535 wait_for_completion(&wait);
1536 spin_lock(&sysctl_lock);
f7e6ced4
AV		 1537 } else {
1538 /* anything non-NULL; we'll never dereference it */
1539 p->unregistering = ERR_PTR(-EINVAL);
330d57fb
AV		 1540 }
1541 /*
1542 * do not remove from the list until nobody holds it; walking the
1543 * list in do_sysctl() relies on that.
1544 */
1545 list_del_init(&p->ctl_entry);
1546}
1547
f7e6ced4
AV		 1548void sysctl_head_get(struct ctl_table_header *head)
1549{
1550 spin_lock(&sysctl_lock);
1551 head->count++;
1552 spin_unlock(&sysctl_lock);
1553}
1554
1555void sysctl_head_put(struct ctl_table_header *head)
1556{
1557 spin_lock(&sysctl_lock);
1558 if (!--head->count)
1559 kfree(head);
1560 spin_unlock(&sysctl_lock);
1561}
1562
1563struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1564{
1565 if (!head)
1566 BUG();
1567 spin_lock(&sysctl_lock);
1568 if (!use_table(head))
1569 head = ERR_PTR(-ENOENT);
1570 spin_unlock(&sysctl_lock);
1571 return head;
1572}
1573
805b5d5e
EB		 1574void sysctl_head_finish(struct ctl_table_header *head)
1575{
1576 if (!head)
1577 return;
1578 spin_lock(&sysctl_lock);
1579 unuse_table(head);
1580 spin_unlock(&sysctl_lock);
1581}
1582
73455092
AV		 1583static struct ctl_table_set *
1584lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1585{
1586 struct ctl_table_set *set = &root->default_set;
1587 if (root->lookup)
1588 set = root->lookup(root, namespaces);
1589 return set;
1590}
1591
e51b6ba0
EB		 1592static struct list_head *
1593lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
805b5d5e 1594{
73455092
AV		 1595 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1596 return &set->list;
e51b6ba0
EB		 1597}
1598
1599struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1600 struct ctl_table_header *prev)
1601{
1602 struct ctl_table_root *root;
1603 struct list_head *header_list;
805b5d5e
EB		 1604 struct ctl_table_header *head;
1605 struct list_head *tmp;
e51b6ba0 1606
805b5d5e
EB		 1607 spin_lock(&sysctl_lock);
1608 if (prev) {
e51b6ba0 1609 head = prev;
805b5d5e
EB		 1610 tmp = &prev->ctl_entry;
1611 unuse_table(prev);
1612 goto next;
1613 }
1614 tmp = &root_table_header.ctl_entry;
1615 for (;;) {
1616 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1617
1618 if (!use_table(head))
1619 goto next;
1620 spin_unlock(&sysctl_lock);
1621 return head;
1622 next:
e51b6ba0 1623 root = head->root;
805b5d5e 1624 tmp = tmp->next;
e51b6ba0
EB		 1625 header_list = lookup_header_list(root, namespaces);
1626 if (tmp != header_list)
1627 continue;
1628
1629 do {
1630 root = list_entry(root->root_list.next,
1631 struct ctl_table_root, root_list);
1632 if (root == &sysctl_table_root)
1633 goto out;
1634 header_list = lookup_header_list(root, namespaces);
1635 } while (list_empty(header_list));
1636 tmp = header_list->next;
805b5d5e 1637 }
e51b6ba0 1638out:
805b5d5e
EB		 1639 spin_unlock(&sysctl_lock);
1640 return NULL;
1641}
1642
e51b6ba0
EB		 1643struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1644{
1645 return __sysctl_head_next(current->nsproxy, prev);
1646}
1647
1648void register_sysctl_root(struct ctl_table_root *root)
1649{
1650 spin_lock(&sysctl_lock);
1651 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1652 spin_unlock(&sysctl_lock);
1653}
1654
b89a8171 1655#ifdef CONFIG_SYSCTL_SYSCALL
2c4c7155 1656/* Perform the actual read/write of a sysctl table entry. */
d7321cd6
PE		 1657static int do_sysctl_strategy(struct ctl_table_root *root,
1658 struct ctl_table *table,
2c4c7155
PE		 1659 void __user *oldval, size_t __user *oldlenp,
1660 void __user *newval, size_t newlen)
1661{
1662 int op = 0, rc;
1663
1664 if (oldval)
e6305c43 1665 op |= MAY_READ;
2c4c7155 1666 if (newval)
e6305c43 1667 op |= MAY_WRITE;
d7321cd6 1668 if (sysctl_perm(root, table, op))
2c4c7155
PE		 1669 return -EPERM;
1670
1671 if (table->strategy) {
f221e726 1672 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1673 if (rc < 0)
1674 return rc;
1675 if (rc > 0)
1676 return 0;
1677 }
1678
1679 /* If there is no strategy routine, or if the strategy returns
1680 * zero, proceed with automatic r/w */
1681 if (table->data && table->maxlen) {
f221e726 1682 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
2c4c7155
PE		 1683 if (rc < 0)
1684 return rc;
1685 }
1686 return 0;
1687}
1688
1689static int parse_table(int __user *name, int nlen,
1690 void __user *oldval, size_t __user *oldlenp,
1691 void __user *newval, size_t newlen,
d7321cd6 1692 struct ctl_table_root *root,
2c4c7155
PE		 1693 struct ctl_table *table)
1694{
1695 int n;
1696repeat:
1697 if (!nlen)
1698 return -ENOTDIR;
1699 if (get_user(n, name))
1700 return -EFAULT;
1701 for ( ; table->ctl_name || table->procname; table++) {
1702 if (!table->ctl_name)
1703 continue;
1704 if (n == table->ctl_name) {
1705 int error;
1706 if (table->child) {
e6305c43 1707 if (sysctl_perm(root, table, MAY_EXEC))
2c4c7155
PE		 1708 return -EPERM;
1709 name++;
1710 nlen--;
1711 table = table->child;
1712 goto repeat;
1713 }
f221e726 1714 error = do_sysctl_strategy(root, table,
2c4c7155
PE		 1715 oldval, oldlenp,
1716 newval, newlen);
1717 return error;
1718 }
1719 }
1720 return -ENOTDIR;
1721}
1722
1da177e4
LT		 1723int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1724 void __user *newval, size_t newlen)
1725{
805b5d5e 1726 struct ctl_table_header *head;
330d57fb 1727 int error = -ENOTDIR;
1da177e4
LT		 1728
1729 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1730 return -ENOTDIR;
1731 if (oldval) {
1732 int old_len;
1733 if (!oldlenp || get_user(old_len, oldlenp))
1734 return -EFAULT;
1735 }
330d57fb 1736
805b5d5e
EB		 1737 for (head = sysctl_head_next(NULL); head;
1738 head = sysctl_head_next(head)) {
330d57fb 1739 error = parse_table(name, nlen, oldval, oldlenp,
d7321cd6
PE		 1740 newval, newlen,
1741 head->root, head->ctl_table);
805b5d5e
EB		 1742 if (error != -ENOTDIR) {
1743 sysctl_head_finish(head);
330d57fb 1744 break;
805b5d5e
EB		 1745 }
1746 }
330d57fb 1747 return error;
1da177e4
LT		 1748}
1749
1e7bfb21 1750SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4
LT		 1751{
1752 struct __sysctl_args tmp;
1753 int error;
1754
1755 if (copy_from_user(&tmp, args, sizeof(tmp)))
1756 return -EFAULT;
1757
7058cb02
EB		 1758 error = deprecated_sysctl_warning(&tmp);
1759 if (error)
1760 goto out;
1761
1da177e4
LT		 1762 lock_kernel();
1763 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1764 tmp.newval, tmp.newlen);
1765 unlock_kernel();
7058cb02 1766out:
1da177e4
LT		 1767 return error;
1768}
b89a8171 1769#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 1770
1771/*
1ff007eb 1772 * sysctl_perm does NOT grant the superuser all rights automatically, because
1da177e4
LT		 1773 * some sysctl variables are readonly even to root.
1774 */
1775
1776static int test_perm(int mode, int op)
1777{
76aac0e9 1778 if (!current_euid())
1da177e4
LT		 1779 mode >>= 6;
1780 else if (in_egroup_p(0))
1781 mode >>= 3;
e6305c43 1782 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1da177e4
LT		 1783 return 0;
1784 return -EACCES;
1785}
1786
d7321cd6 1787int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1da177e4
LT		 1788{
1789 int error;
d7321cd6
PE		 1790 int mode;
1791
e6305c43 1792 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1da177e4
LT		 1793 if (error)
1794 return error;
d7321cd6
PE		 1795
1796 if (root->permissions)
1797 mode = root->permissions(root, current->nsproxy, table);
1798 else
1799 mode = table->mode;
1800
1801 return test_perm(mode, op);
1da177e4
LT		 1802}
1803
d912b0cc
EB		 1804static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1805{
1806 for (; table->ctl_name || table->procname; table++) {
1807 table->parent = parent;
1808 if (table->child)
1809 sysctl_set_parent(table, table->child);
1810 }
1811}
1812
1813static __init int sysctl_init(void)
1814{
1815 sysctl_set_parent(NULL, root_table);
88f458e4
HS		 1816#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1817 {
1818 int err;
1819 err = sysctl_check_table(current->nsproxy, root_table);
1820 }
1821#endif
d912b0cc
EB		 1822 return 0;
1823}
1824
1825core_initcall(sysctl_init);
1826
bfbcf034
AV		 1827static struct ctl_table *is_branch_in(struct ctl_table *branch,
1828 struct ctl_table *table)
ae7edecc
AV		 1829{
1830 struct ctl_table *p;
1831 const char *s = branch->procname;
1832
1833 /* branch should have named subdirectory as its first element */
1834 if (!s || !branch->child)
bfbcf034 1835 return NULL;
ae7edecc
AV		 1836
1837 /* ... and nothing else */
1838 if (branch[1].procname || branch[1].ctl_name)
bfbcf034 1839 return NULL;
ae7edecc
AV		 1840
1841 /* table should contain subdirectory with the same name */
1842 for (p = table; p->procname || p->ctl_name; p++) {
1843 if (!p->child)
1844 continue;
1845 if (p->procname && strcmp(p->procname, s) == 0)
bfbcf034 1846 return p;
ae7edecc 1847 }
bfbcf034 1848 return NULL;
ae7edecc
AV		 1849}
1850
1851/* see if attaching q to p would be an improvement */
1852static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1853{
1854 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
bfbcf034 1855 struct ctl_table *next;
ae7edecc
AV		 1856 int is_better = 0;
1857 int not_in_parent = !p->attached_by;
1858
bfbcf034 1859 while ((next = is_branch_in(by, to)) != NULL) {
ae7edecc
AV		 1860 if (by == q->attached_by)
1861 is_better = 1;
1862 if (to == p->attached_by)
1863 not_in_parent = 1;
1864 by = by->child;
bfbcf034 1865 to = next->child;
ae7edecc
AV		 1866 }
1867
1868 if (is_better && not_in_parent) {
1869 q->attached_by = by;
1870 q->attached_to = to;
1871 q->parent = p;
1872 }
1873}
1874
1da177e4 1875/**
e51b6ba0
EB		 1876 * __register_sysctl_paths - register a sysctl hierarchy
1877 * @root: List of sysctl headers to register on
1878 * @namespaces: Data to compute which lists of sysctl entries are visible
29e796fd 1879 * @path: The path to the directory the sysctl table is in.
1da177e4 1880 * @table: the top-level table structure
1da177e4
LT		 1881 *
1882 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
29e796fd 1883 * array. A completely 0 filled entry terminates the table.
1da177e4 1884 *
d8217f07 1885 * The members of the &struct ctl_table structure are used as follows:
1da177e4
LT		 1886 *
1887 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1888 * must be unique within that level of sysctl
1889 *
1890 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1891 * enter a sysctl file
1892 *
1893 * data - a pointer to data for use by proc_handler
1894 *
1895 * maxlen - the maximum size in bytes of the data
1896 *
1897 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1898 *
1899 * child - a pointer to the child sysctl table if this entry is a directory, or
1900 * %NULL.
1901 *
1902 * proc_handler - the text handler routine (described below)
1903 *
1904 * strategy - the strategy routine (described below)
1905 *
1906 * de - for internal use by the sysctl routines
1907 *
1908 * extra1, extra2 - extra pointers usable by the proc handler routines
1909 *
1910 * Leaf nodes in the sysctl tree will be represented by a single file
1911 * under /proc; non-leaf nodes will be represented by directories.
1912 *
1913 * sysctl(2) can automatically manage read and write requests through
1914 * the sysctl table. The data and maxlen fields of the ctl_table
1915 * struct enable minimal validation of the values being written to be
1916 * performed, and the mode field allows minimal authentication.
1917 *
1918 * More sophisticated management can be enabled by the provision of a
1919 * strategy routine with the table entry. This will be called before
1920 * any automatic read or write of the data is performed.
1921 *
1922 * The strategy routine may return
1923 *
1924 * < 0 - Error occurred (error is passed to user process)
1925 *
1926 * 0 - OK - proceed with automatic read or write.
1927 *
1928 * > 0 - OK - read or write has been done by the strategy routine, so
1929 * return immediately.
1930 *
1931 * There must be a proc_handler routine for any terminal nodes
1932 * mirrored under /proc/sys (non-terminals are handled by a built-in
1933 * directory handler). Several default handlers are available to
1934 * cover common cases -
1935 *
1936 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1937 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1938 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1939 *
1940 * It is the handler's job to read the input buffer from user memory
1941 * and process it. The handler should return 0 on success.
1942 *
1943 * This routine returns %NULL on a failure to register, and a pointer
1944 * to the table header on success.
1945 */
e51b6ba0
EB		 1946struct ctl_table_header *__register_sysctl_paths(
1947 struct ctl_table_root *root,
1948 struct nsproxy *namespaces,
1949 const struct ctl_path *path, struct ctl_table *table)
1da177e4 1950{
29e796fd
EB		 1951 struct ctl_table_header *header;
1952 struct ctl_table *new, **prevp;
1953 unsigned int n, npath;
ae7edecc 1954 struct ctl_table_set *set;
29e796fd
EB		 1955
1956 /* Count the path components */
1957 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1958 ;
1959
1960 /*
1961 * For each path component, allocate a 2-element ctl_table array.
1962 * The first array element will be filled with the sysctl entry
1963 * for this, the second will be the sentinel (ctl_name == 0).
1964 *
1965 * We allocate everything in one go so that we don't have to
1966 * worry about freeing additional memory in unregister_sysctl_table.
1967 */
1968 header = kzalloc(sizeof(struct ctl_table_header) +
1969 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1970 if (!header)
1da177e4 1971 return NULL;
29e796fd
EB		 1972
1973 new = (struct ctl_table *) (header + 1);
1974
1975 /* Now connect the dots */
1976 prevp = &header->ctl_table;
1977 for (n = 0; n < npath; ++n, ++path) {
1978 /* Copy the procname */
1979 new->procname = path->procname;
1980 new->ctl_name = path->ctl_name;
1981 new->mode = 0555;
1982
1983 *prevp = new;
1984 prevp = &new->child;
1985
1986 new += 2;
1987 }
1988 *prevp = table;
23eb06de 1989 header->ctl_table_arg = table;
29e796fd
EB		 1990
1991 INIT_LIST_HEAD(&header->ctl_entry);
1992 header->used = 0;
1993 header->unregistering = NULL;
e51b6ba0 1994 header->root = root;
29e796fd 1995 sysctl_set_parent(NULL, header->ctl_table);
f7e6ced4 1996 header->count = 1;
88f458e4 1997#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
e51b6ba0 1998 if (sysctl_check_table(namespaces, header->ctl_table)) {
29e796fd 1999 kfree(header);
fc6cd25b
EB		 2000 return NULL;
2001 }
88f458e4 2002#endif
330d57fb 2003 spin_lock(&sysctl_lock);
73455092 2004 header->set = lookup_header_set(root, namespaces);
ae7edecc
AV		 2005 header->attached_by = header->ctl_table;
2006 header->attached_to = root_table;
2007 header->parent = &root_table_header;
2008 for (set = header->set; set; set = set->parent) {
2009 struct ctl_table_header *p;
2010 list_for_each_entry(p, &set->list, ctl_entry) {
2011 if (p->unregistering)
2012 continue;
2013 try_attach(p, header);
2014 }
2015 }
2016 header->parent->count++;
73455092 2017 list_add_tail(&header->ctl_entry, &header->set->list);
330d57fb 2018 spin_unlock(&sysctl_lock);
29e796fd
EB		 2019
2020 return header;
2021}
2022
e51b6ba0
EB		 2023/**
2024 * register_sysctl_table_path - register a sysctl table hierarchy
2025 * @path: The path to the directory the sysctl table is in.
2026 * @table: the top-level table structure
2027 *
2028 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2029 * array. A completely 0 filled entry terminates the table.
2030 *
2031 * See __register_sysctl_paths for more details.
2032 */
2033struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2034 struct ctl_table *table)
2035{
2036 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
2037 path, table);
2038}
2039
29e796fd
EB		 2040/**
2041 * register_sysctl_table - register a sysctl table hierarchy
2042 * @table: the top-level table structure
2043 *
2044 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2045 * array. A completely 0 filled entry terminates the table.
2046 *
2047 * See register_sysctl_paths for more details.
2048 */
2049struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2050{
2051 static const struct ctl_path null_path[] = { {} };
2052
2053 return register_sysctl_paths(null_path, table);
1da177e4
LT		 2054}
2055
2056/**
2057 * unregister_sysctl_table - unregister a sysctl table hierarchy
2058 * @header: the header returned from register_sysctl_table
2059 *
2060 * Unregisters the sysctl table and all children. proc entries may not
2061 * actually be removed until they are no longer used by anyone.
2062 */
2063void unregister_sysctl_table(struct ctl_table_header * header)
2064{
330d57fb 2065 might_sleep();
f1dad166
PE		 2066
2067 if (header == NULL)
2068 return;
2069
330d57fb
AV		 2070 spin_lock(&sysctl_lock);
2071 start_unregistering(header);
ae7edecc
AV		 2072 if (!--header->parent->count) {
2073 WARN_ON(1);
2074 kfree(header->parent);
2075 }
f7e6ced4
AV		 2076 if (!--header->count)
2077 kfree(header);
330d57fb 2078 spin_unlock(&sysctl_lock);
1da177e4
LT		 2079}
2080
9043476f
AV		 2081int sysctl_is_seen(struct ctl_table_header *p)
2082{
2083 struct ctl_table_set *set = p->set;
2084 int res;
2085 spin_lock(&sysctl_lock);
2086 if (p->unregistering)
2087 res = 0;
2088 else if (!set->is_seen)
2089 res = 1;
2090 else
2091 res = set->is_seen(set);
2092 spin_unlock(&sysctl_lock);
2093 return res;
2094}
2095
73455092
AV		 2096void setup_sysctl_set(struct ctl_table_set *p,
2097 struct ctl_table_set *parent,
2098 int (*is_seen)(struct ctl_table_set *))
2099{
2100 INIT_LIST_HEAD(&p->list);
2101 p->parent = parent ? parent : &sysctl_table_root.default_set;
2102 p->is_seen = is_seen;
2103}
2104
b89a8171 2105#else /* !CONFIG_SYSCTL */
d8217f07 2106struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
b89a8171
EB		 2107{
2108 return NULL;
2109}
2110
29e796fd
EB		 2111struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2112 struct ctl_table *table)
2113{
2114 return NULL;
2115}
2116
b89a8171
EB		 2117void unregister_sysctl_table(struct ctl_table_header * table)
2118{
2119}
2120
73455092
AV		 2121void setup_sysctl_set(struct ctl_table_set *p,
2122 struct ctl_table_set *parent,
2123 int (*is_seen)(struct ctl_table_set *))
2124{
2125}
2126
f7e6ced4
AV		 2127void sysctl_head_put(struct ctl_table_header *head)
2128{
2129}
2130
b89a8171
EB		 2131#endif /* CONFIG_SYSCTL */
2132
1da177e4
LT		 2133/*
2134 * /proc/sys support
2135 */
2136
b89a8171 2137#ifdef CONFIG_PROC_SYSCTL
1da177e4 2138
b1ba4ddd
AB		 2139static int _proc_do_string(void* data, int maxlen, int write,
2140 struct file *filp, void __user *buffer,
2141 size_t *lenp, loff_t *ppos)
1da177e4
LT		 2142{
2143 size_t len;
2144 char __user *p;
2145 char c;
8d060877
ON		 2146
2147 if (!data || !maxlen || !*lenp) {
1da177e4
LT		 2148 *lenp = 0;
2149 return 0;
2150 }
8d060877 2151
1da177e4
LT		 2152 if (write) {
2153 len = 0;
2154 p = buffer;
2155 while (len < *lenp) {
2156 if (get_user(c, p++))
2157 return -EFAULT;
2158 if (c == 0 || c == '\n')
2159 break;
2160 len++;
2161 }
f5dd3d6f
SV		 2162 if (len >= maxlen)
2163 len = maxlen-1;
2164 if(copy_from_user(data, buffer, len))
1da177e4 2165 return -EFAULT;
f5dd3d6f 2166 ((char *) data)[len] = 0;
1da177e4
LT		 2167 *ppos += *lenp;
2168 } else {
f5dd3d6f
SV		 2169 len = strlen(data);
2170 if (len > maxlen)
2171 len = maxlen;
8d060877
ON		 2172
2173 if (*ppos > len) {
2174 *lenp = 0;
2175 return 0;
2176 }
2177
2178 data += *ppos;
2179 len -= *ppos;
2180
1da177e4
LT		 2181 if (len > *lenp)
2182 len = *lenp;
2183 if (len)
f5dd3d6f 2184 if(copy_to_user(buffer, data, len))
1da177e4
LT		 2185 return -EFAULT;
2186 if (len < *lenp) {
2187 if(put_user('\n', ((char __user *) buffer) + len))
2188 return -EFAULT;
2189 len++;
2190 }
2191 *lenp = len;
2192 *ppos += len;
2193 }
2194 return 0;
2195}
2196
f5dd3d6f
SV		 2197/**
2198 * proc_dostring - read a string sysctl
2199 * @table: the sysctl table
2200 * @write: %TRUE if this is a write to the sysctl file
2201 * @filp: the file structure
2202 * @buffer: the user buffer
2203 * @lenp: the size of the user buffer
2204 * @ppos: file position
2205 *
2206 * Reads/writes a string from/to the user buffer. If the kernel
2207 * buffer provided is not large enough to hold the string, the
2208 * string is truncated. The copied string is %NULL-terminated.
2209 * If the string is being read by the user process, it is copied
2210 * and a newline '\n' is added. It is truncated if the buffer is
2211 * not large enough.
2212 *
2213 * Returns 0 on success.
2214 */
d8217f07 2215int proc_dostring(struct ctl_table *table, int write, struct file *filp,
f5dd3d6f
SV		 2216 void __user *buffer, size_t *lenp, loff_t *ppos)
2217{
2218 return _proc_do_string(table->data, table->maxlen, write, filp,
2219 buffer, lenp, ppos);
2220}
2221
1da177e4
LT		 2222
2223static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2224 int *valp,
2225 int write, void *data)
2226{
2227 if (write) {
2228 *valp = *negp ? -*lvalp : *lvalp;
2229 } else {
2230 int val = *valp;
2231 if (val < 0) {
2232 *negp = -1;
2233 *lvalp = (unsigned long)-val;
2234 } else {
2235 *negp = 0;
2236 *lvalp = (unsigned long)val;
2237 }
2238 }
2239 return 0;
2240}
2241
d8217f07 2242static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
fcfbd547
KK		 2243 int write, struct file *filp, void __user *buffer,
2244 size_t *lenp, loff_t *ppos,
1da177e4
LT		 2245 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2246 int write, void *data),
2247 void *data)
2248{
2249#define TMPBUFLEN 21
2250 int *i, vleft, first=1, neg, val;
2251 unsigned long lval;
2252 size_t left, len;
2253
2254 char buf[TMPBUFLEN], *p;
2255 char __user *s = buffer;
2256
fcfbd547 2257 if (!tbl_data || !table->maxlen || !*lenp ||
1da177e4
LT		 2258 (*ppos && !write)) {
2259 *lenp = 0;
2260 return 0;
2261 }
2262
fcfbd547 2263 i = (int *) tbl_data;
1da177e4
LT		 2264 vleft = table->maxlen / sizeof(*i);
2265 left = *lenp;
2266
2267 if (!conv)
2268 conv = do_proc_dointvec_conv;
2269
2270 for (; left && vleft--; i++, first=0) {
2271 if (write) {
2272 while (left) {
2273 char c;
2274 if (get_user(c, s))
2275 return -EFAULT;
2276 if (!isspace(c))
2277 break;
2278 left--;
2279 s++;
2280 }
2281 if (!left)
2282 break;
2283 neg = 0;
2284 len = left;
2285 if (len > sizeof(buf) - 1)
2286 len = sizeof(buf) - 1;
2287 if (copy_from_user(buf, s, len))
2288 return -EFAULT;
2289 buf[len] = 0;
2290 p = buf;
2291 if (*p == '-' && left > 1) {
2292 neg = 1;
bd9b0bac 2293 p++;
1da177e4
LT		 2294 }
2295 if (*p < '0' || *p > '9')
2296 break;
2297
2298 lval = simple_strtoul(p, &p, 0);
2299
2300 len = p-buf;
2301 if ((len < left) && *p && !isspace(*p))
2302 break;
2303 if (neg)
2304 val = -val;
2305 s += len;
2306 left -= len;
2307
2308 if (conv(&neg, &lval, i, 1, data))
2309 break;
2310 } else {
2311 p = buf;
2312 if (!first)
2313 *p++ = '\t';
2314
2315 if (conv(&neg, &lval, i, 0, data))
2316 break;
2317
2318 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2319 len = strlen(buf);
2320 if (len > left)
2321 len = left;
2322 if(copy_to_user(s, buf, len))
2323 return -EFAULT;
2324 left -= len;
2325 s += len;
2326 }
2327 }
2328
2329 if (!write && !first && left) {
2330 if(put_user('\n', s))
2331 return -EFAULT;
2332 left--, s++;
2333 }
2334 if (write) {
2335 while (left) {
2336 char c;
2337 if (get_user(c, s++))
2338 return -EFAULT;
2339 if (!isspace(c))
2340 break;
2341 left--;
2342 }
2343 }
2344 if (write && first)
2345 return -EINVAL;
2346 *lenp -= left;
2347 *ppos += *lenp;
2348 return 0;
2349#undef TMPBUFLEN
2350}
2351
d8217f07 2352static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
fcfbd547
KK		 2353 void __user *buffer, size_t *lenp, loff_t *ppos,
2354 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2355 int write, void *data),
2356 void *data)
2357{
2358 return __do_proc_dointvec(table->data, table, write, filp,
2359 buffer, lenp, ppos, conv, data);
2360}
2361
1da177e4
LT		 2362/**
2363 * proc_dointvec - read a vector of integers
2364 * @table: the sysctl table
2365 * @write: %TRUE if this is a write to the sysctl file
2366 * @filp: the file structure
2367 * @buffer: the user buffer
2368 * @lenp: the size of the user buffer
2369 * @ppos: file position
2370 *
2371 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2372 * values from/to the user buffer, treated as an ASCII string.
2373 *
2374 * Returns 0 on success.
2375 */
d8217f07 2376int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2377 void __user *buffer, size_t *lenp, loff_t *ppos)
2378{
2379 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2380 NULL,NULL);
2381}
2382
34f5a398 2383/*
25ddbb18
AK		 2384 * Taint values can only be increased
2385 * This means we can safely use a temporary.
34f5a398 2386 */
25ddbb18 2387static int proc_taint(struct ctl_table *table, int write, struct file *filp,
34f5a398
TT		 2388 void __user *buffer, size_t *lenp, loff_t *ppos)
2389{
25ddbb18
AK		 2390 struct ctl_table t;
2391 unsigned long tmptaint = get_taint();
2392 int err;
34f5a398 2393
91fcd412 2394 if (write && !capable(CAP_SYS_ADMIN))
34f5a398
TT		 2395 return -EPERM;
2396
25ddbb18
AK		 2397 t = *table;
2398 t.data = &tmptaint;
2399 err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2400 if (err < 0)
2401 return err;
2402
2403 if (write) {
2404 /*
2405 * Poor man's atomic or. Not worth adding a primitive
2406 * to everyone's atomic.h for this
2407 */
2408 int i;
2409 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2410 if ((tmptaint >> i) & 1)
2411 add_taint(i);
2412 }
2413 }
2414
2415 return err;
34f5a398
TT		 2416}
2417
1da177e4
LT		 2418struct do_proc_dointvec_minmax_conv_param {
2419 int *min;
2420 int *max;
2421};
2422
2423static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2424 int *valp,
2425 int write, void *data)
2426{
2427 struct do_proc_dointvec_minmax_conv_param *param = data;
2428 if (write) {
2429 int val = *negp ? -*lvalp : *lvalp;
2430 if ((param->min && *param->min > val) ||
2431 (param->max && *param->max < val))
2432 return -EINVAL;
2433 *valp = val;
2434 } else {
2435 int val = *valp;
2436 if (val < 0) {
2437 *negp = -1;
2438 *lvalp = (unsigned long)-val;
2439 } else {
2440 *negp = 0;
2441 *lvalp = (unsigned long)val;
2442 }
2443 }
2444 return 0;
2445}
2446
2447/**
2448 * proc_dointvec_minmax - read a vector of integers with min/max values
2449 * @table: the sysctl table
2450 * @write: %TRUE if this is a write to the sysctl file
2451 * @filp: the file structure
2452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: file position
2455 *
2456 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2457 * values from/to the user buffer, treated as an ASCII string.
2458 *
2459 * This routine will ensure the values are within the range specified by
2460 * table->extra1 (min) and table->extra2 (max).
2461 *
2462 * Returns 0 on success.
2463 */
d8217f07 2464int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2466{
2467 struct do_proc_dointvec_minmax_conv_param param = {
2468 .min = (int *) table->extra1,
2469 .max = (int *) table->extra2,
2470 };
2471 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2472 do_proc_dointvec_minmax_conv, &param);
2473}
2474
d8217f07 2475static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1da177e4
LT		 2476 struct file *filp,
2477 void __user *buffer,
2478 size_t *lenp, loff_t *ppos,
2479 unsigned long convmul,
2480 unsigned long convdiv)
2481{
2482#define TMPBUFLEN 21
2483 unsigned long *i, *min, *max, val;
2484 int vleft, first=1, neg;
2485 size_t len, left;
2486 char buf[TMPBUFLEN], *p;
2487 char __user *s = buffer;
2488
fcfbd547 2489 if (!data || !table->maxlen || !*lenp ||
1da177e4
LT		 2490 (*ppos && !write)) {
2491 *lenp = 0;
2492 return 0;
2493 }
2494
fcfbd547 2495 i = (unsigned long *) data;
1da177e4
LT		 2496 min = (unsigned long *) table->extra1;
2497 max = (unsigned long *) table->extra2;
2498 vleft = table->maxlen / sizeof(unsigned long);
2499 left = *lenp;
2500
2501 for (; left && vleft--; i++, min++, max++, first=0) {
2502 if (write) {
2503 while (left) {
2504 char c;
2505 if (get_user(c, s))
2506 return -EFAULT;
2507 if (!isspace(c))
2508 break;
2509 left--;
2510 s++;
2511 }
2512 if (!left)
2513 break;
2514 neg = 0;
2515 len = left;
2516 if (len > TMPBUFLEN-1)
2517 len = TMPBUFLEN-1;
2518 if (copy_from_user(buf, s, len))
2519 return -EFAULT;
2520 buf[len] = 0;
2521 p = buf;
2522 if (*p == '-' && left > 1) {
2523 neg = 1;
bd9b0bac 2524 p++;
1da177e4
LT		 2525 }
2526 if (*p < '0' || *p > '9')
2527 break;
2528 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2529 len = p-buf;
2530 if ((len < left) && *p && !isspace(*p))
2531 break;
2532 if (neg)
2533 val = -val;
2534 s += len;
2535 left -= len;
2536
2537 if(neg)
2538 continue;
2539 if ((min && val < *min) || (max && val > *max))
2540 continue;
2541 *i = val;
2542 } else {
2543 p = buf;
2544 if (!first)
2545 *p++ = '\t';
2546 sprintf(p, "%lu", convdiv * (*i) / convmul);
2547 len = strlen(buf);
2548 if (len > left)
2549 len = left;
2550 if(copy_to_user(s, buf, len))
2551 return -EFAULT;
2552 left -= len;
2553 s += len;
2554 }
2555 }
2556
2557 if (!write && !first && left) {
2558 if(put_user('\n', s))
2559 return -EFAULT;
2560 left--, s++;
2561 }
2562 if (write) {
2563 while (left) {
2564 char c;
2565 if (get_user(c, s++))
2566 return -EFAULT;
2567 if (!isspace(c))
2568 break;
2569 left--;
2570 }
2571 }
2572 if (write && first)
2573 return -EINVAL;
2574 *lenp -= left;
2575 *ppos += *lenp;
2576 return 0;
2577#undef TMPBUFLEN
2578}
2579
d8217f07 2580static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
fcfbd547
KK		 2581 struct file *filp,
2582 void __user *buffer,
2583 size_t *lenp, loff_t *ppos,
2584 unsigned long convmul,
2585 unsigned long convdiv)
2586{
2587 return __do_proc_doulongvec_minmax(table->data, table, write,
2588 filp, buffer, lenp, ppos, convmul, convdiv);
2589}
2590
1da177e4
LT		 2591/**
2592 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2593 * @table: the sysctl table
2594 * @write: %TRUE if this is a write to the sysctl file
2595 * @filp: the file structure
2596 * @buffer: the user buffer
2597 * @lenp: the size of the user buffer
2598 * @ppos: file position
2599 *
2600 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2601 * values from/to the user buffer, treated as an ASCII string.
2602 *
2603 * This routine will ensure the values are within the range specified by
2604 * table->extra1 (min) and table->extra2 (max).
2605 *
2606 * Returns 0 on success.
2607 */
d8217f07 2608int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2609 void __user *buffer, size_t *lenp, loff_t *ppos)
2610{
2611 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2612}
2613
2614/**
2615 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2616 * @table: the sysctl table
2617 * @write: %TRUE if this is a write to the sysctl file
2618 * @filp: the file structure
2619 * @buffer: the user buffer
2620 * @lenp: the size of the user buffer
2621 * @ppos: file position
2622 *
2623 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2624 * values from/to the user buffer, treated as an ASCII string. The values
2625 * are treated as milliseconds, and converted to jiffies when they are stored.
2626 *
2627 * This routine will ensure the values are within the range specified by
2628 * table->extra1 (min) and table->extra2 (max).
2629 *
2630 * Returns 0 on success.
2631 */
d8217f07 2632int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2633 struct file *filp,
2634 void __user *buffer,
2635 size_t *lenp, loff_t *ppos)
2636{
2637 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2638 lenp, ppos, HZ, 1000l);
2639}
2640
2641
2642static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2643 int *valp,
2644 int write, void *data)
2645{
2646 if (write) {
cba9f33d
BS		 2647 if (*lvalp > LONG_MAX / HZ)
2648 return 1;
1da177e4
LT		 2649 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2650 } else {
2651 int val = *valp;
2652 unsigned long lval;
2653 if (val < 0) {
2654 *negp = -1;
2655 lval = (unsigned long)-val;
2656 } else {
2657 *negp = 0;
2658 lval = (unsigned long)val;
2659 }
2660 *lvalp = lval / HZ;
2661 }
2662 return 0;
2663}
2664
2665static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2666 int *valp,
2667 int write, void *data)
2668{
2669 if (write) {
cba9f33d
BS		 2670 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2671 return 1;
1da177e4
LT		 2672 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2673 } else {
2674 int val = *valp;
2675 unsigned long lval;
2676 if (val < 0) {
2677 *negp = -1;
2678 lval = (unsigned long)-val;
2679 } else {
2680 *negp = 0;
2681 lval = (unsigned long)val;
2682 }
2683 *lvalp = jiffies_to_clock_t(lval);
2684 }
2685 return 0;
2686}
2687
2688static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2689 int *valp,
2690 int write, void *data)
2691{
2692 if (write) {
2693 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2694 } else {
2695 int val = *valp;
2696 unsigned long lval;
2697 if (val < 0) {
2698 *negp = -1;
2699 lval = (unsigned long)-val;
2700 } else {
2701 *negp = 0;
2702 lval = (unsigned long)val;
2703 }
2704 *lvalp = jiffies_to_msecs(lval);
2705 }
2706 return 0;
2707}
2708
2709/**
2710 * proc_dointvec_jiffies - read a vector of integers as seconds
2711 * @table: the sysctl table
2712 * @write: %TRUE if this is a write to the sysctl file
2713 * @filp: the file structure
2714 * @buffer: the user buffer
2715 * @lenp: the size of the user buffer
2716 * @ppos: file position
2717 *
2718 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2719 * values from/to the user buffer, treated as an ASCII string.
2720 * The values read are assumed to be in seconds, and are converted into
2721 * jiffies.
2722 *
2723 * Returns 0 on success.
2724 */
d8217f07 2725int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2726 void __user *buffer, size_t *lenp, loff_t *ppos)
2727{
2728 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2729 do_proc_dointvec_jiffies_conv,NULL);
2730}
2731
2732/**
2733 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2734 * @table: the sysctl table
2735 * @write: %TRUE if this is a write to the sysctl file
2736 * @filp: the file structure
2737 * @buffer: the user buffer
2738 * @lenp: the size of the user buffer
1e5d5331 2739 * @ppos: pointer to the file position
1da177e4
LT		 2740 *
2741 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2742 * values from/to the user buffer, treated as an ASCII string.
2743 * The values read are assumed to be in 1/USER_HZ seconds, and
2744 * are converted into jiffies.
2745 *
2746 * Returns 0 on success.
2747 */
d8217f07 2748int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2749 void __user *buffer, size_t *lenp, loff_t *ppos)
2750{
2751 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2752 do_proc_dointvec_userhz_jiffies_conv,NULL);
2753}
2754
2755/**
2756 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2757 * @table: the sysctl table
2758 * @write: %TRUE if this is a write to the sysctl file
2759 * @filp: the file structure
2760 * @buffer: the user buffer
2761 * @lenp: the size of the user buffer
67be2dd1
MW		 2762 * @ppos: file position
2763 * @ppos: the current position in the file
1da177e4
LT		 2764 *
2765 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2766 * values from/to the user buffer, treated as an ASCII string.
2767 * The values read are assumed to be in 1/1000 seconds, and
2768 * are converted into jiffies.
2769 *
2770 * Returns 0 on success.
2771 */
d8217f07 2772int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2773 void __user *buffer, size_t *lenp, loff_t *ppos)
2774{
2775 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2776 do_proc_dointvec_ms_jiffies_conv, NULL);
2777}
2778
d8217f07 2779static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
9ec52099
CLG		 2780 void __user *buffer, size_t *lenp, loff_t *ppos)
2781{
2782 struct pid *new_pid;
2783 pid_t tmp;
2784 int r;
2785
6c5f3e7b 2786 tmp = pid_vnr(cad_pid);
9ec52099
CLG		 2787
2788 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2789 lenp, ppos, NULL, NULL);
2790 if (r || !write)
2791 return r;
2792
2793 new_pid = find_get_pid(tmp);
2794 if (!new_pid)
2795 return -ESRCH;
2796
2797 put_pid(xchg(&cad_pid, new_pid));
2798 return 0;
2799}
2800
1da177e4
LT		 2801#else /* CONFIG_PROC_FS */
2802
d8217f07 2803int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2804 void __user *buffer, size_t *lenp, loff_t *ppos)
2805{
2806 return -ENOSYS;
2807}
2808
d8217f07 2809int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1da177e4 2810 void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 2811{
2812 return -ENOSYS;
2813}
2814
d8217f07 2815int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2816 void __user *buffer, size_t *lenp, loff_t *ppos)
2817{
2818 return -ENOSYS;
2819}
2820
d8217f07 2821int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2822 void __user *buffer, size_t *lenp, loff_t *ppos)
2823{
2824 return -ENOSYS;
2825}
2826
d8217f07 2827int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2828 void __user *buffer, size_t *lenp, loff_t *ppos)
2829{
2830 return -ENOSYS;
2831}
2832
d8217f07 2833int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2834 void __user *buffer, size_t *lenp, loff_t *ppos)
2835{
2836 return -ENOSYS;
2837}
2838
d8217f07 2839int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
1da177e4
LT		 2840 void __user *buffer, size_t *lenp, loff_t *ppos)
2841{
2842 return -ENOSYS;
2843}
2844
d8217f07 2845int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1da177e4
LT		 2846 struct file *filp,
2847 void __user *buffer,
2848 size_t *lenp, loff_t *ppos)
2849{
2850 return -ENOSYS;
2851}
2852
2853
2854#endif /* CONFIG_PROC_FS */
2855
2856
b89a8171 2857#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 2858/*
2859 * General sysctl support routines
2860 */
2861
49a0c458 2862/* The generic sysctl data routine (used if no strategy routine supplied) */
f221e726 2863int sysctl_data(struct ctl_table *table,
49a0c458
EB		 2864 void __user *oldval, size_t __user *oldlenp,
2865 void __user *newval, size_t newlen)
2866{
2867 size_t len;
2868
2869 /* Get out of I don't have a variable */
2870 if (!table->data || !table->maxlen)
2871 return -ENOTDIR;
2872
2873 if (oldval && oldlenp) {
2874 if (get_user(len, oldlenp))
2875 return -EFAULT;
2876 if (len) {
2877 if (len > table->maxlen)
2878 len = table->maxlen;
2879 if (copy_to_user(oldval, table->data, len))
2880 return -EFAULT;
2881 if (put_user(len, oldlenp))
2882 return -EFAULT;
2883 }
2884 }
2885
2886 if (newval && newlen) {
2887 if (newlen > table->maxlen)
2888 newlen = table->maxlen;
2889
2890 if (copy_from_user(table->data, newval, newlen))
2891 return -EFAULT;
2892 }
2893 return 1;
2894}
2895
1da177e4 2896/* The generic string strategy routine: */
f221e726 2897int sysctl_string(struct ctl_table *table,
1da177e4 2898 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2899 void __user *newval, size_t newlen)
1da177e4 2900{
1da177e4
LT		 2901 if (!table->data || !table->maxlen)
2902 return -ENOTDIR;
2903
2904 if (oldval && oldlenp) {
de9e007d
LT		 2905 size_t bufsize;
2906 if (get_user(bufsize, oldlenp))
1da177e4 2907 return -EFAULT;
de9e007d
LT		 2908 if (bufsize) {
2909 size_t len = strlen(table->data), copied;
2910
2911 /* This shouldn't trigger for a well-formed sysctl */
2912 if (len > table->maxlen)
1da177e4 2913 len = table->maxlen;
de9e007d
LT		 2914
2915 /* Copy up to a max of bufsize-1 bytes of the string */
2916 copied = (len >= bufsize) ? bufsize - 1 : len;
2917
2918 if (copy_to_user(oldval, table->data, copied) ||
2919 put_user(0, (char __user *)(oldval + copied)))
1da177e4 2920 return -EFAULT;
de9e007d 2921 if (put_user(len, oldlenp))
1da177e4
LT		 2922 return -EFAULT;
2923 }
2924 }
2925 if (newval && newlen) {
de9e007d 2926 size_t len = newlen;
1da177e4
LT		 2927 if (len > table->maxlen)
2928 len = table->maxlen;
2929 if(copy_from_user(table->data, newval, len))
2930 return -EFAULT;
2931 if (len == table->maxlen)
2932 len--;
2933 ((char *) table->data)[len] = 0;
2934 }
82c9df82 2935 return 1;
1da177e4
LT		 2936}
2937
2938/*
2939 * This function makes sure that all of the integers in the vector
2940 * are between the minimum and maximum values given in the arrays
2941 * table->extra1 and table->extra2, respectively.
2942 */
f221e726 2943int sysctl_intvec(struct ctl_table *table,
1da177e4 2944 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2945 void __user *newval, size_t newlen)
1da177e4
LT		 2946{
2947
2948 if (newval && newlen) {
2949 int __user *vec = (int __user *) newval;
2950 int *min = (int *) table->extra1;
2951 int *max = (int *) table->extra2;
2952 size_t length;
2953 int i;
2954
2955 if (newlen % sizeof(int) != 0)
2956 return -EINVAL;
2957
2958 if (!table->extra1 && !table->extra2)
2959 return 0;
2960
2961 if (newlen > table->maxlen)
2962 newlen = table->maxlen;
2963 length = newlen / sizeof(int);
2964
2965 for (i = 0; i < length; i++) {
2966 int value;
2967 if (get_user(value, vec + i))
2968 return -EFAULT;
2969 if (min && value < min[i])
2970 return -EINVAL;
2971 if (max && value > max[i])
2972 return -EINVAL;
2973 }
2974 }
2975 return 0;
2976}
2977
2978/* Strategy function to convert jiffies to seconds */
f221e726 2979int sysctl_jiffies(struct ctl_table *table,
1da177e4 2980 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 2981 void __user *newval, size_t newlen)
1da177e4 2982{
3ee75ac3 2983 if (oldval && oldlenp) {
1da177e4 2984 size_t olen;
3ee75ac3
AD		 2985
2986 if (get_user(olen, oldlenp))
2987 return -EFAULT;
2988 if (olen) {
2989 int val;
2990
2991 if (olen < sizeof(int))
2992 return -EINVAL;
2993
2994 val = *(int *)(table->data) / HZ;
2995 if (put_user(val, (int __user *)oldval))
2996 return -EFAULT;
2997 if (put_user(sizeof(int), oldlenp))
1da177e4 2998 return -EFAULT;
1da177e4 2999 }
1da177e4
LT		 3000 }
3001 if (newval && newlen) {
3002 int new;
3003 if (newlen != sizeof(int))
3004 return -EINVAL;
3005 if (get_user(new, (int __user *)newval))
3006 return -EFAULT;
3007 *(int *)(table->data) = new*HZ;
3008 }
3009 return 1;
3010}
3011
3012/* Strategy function to convert jiffies to seconds */
f221e726 3013int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3014 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3015 void __user *newval, size_t newlen)
1da177e4 3016{
3ee75ac3 3017 if (oldval && oldlenp) {
1da177e4 3018 size_t olen;
3ee75ac3
AD		 3019
3020 if (get_user(olen, oldlenp))
3021 return -EFAULT;
3022 if (olen) {
3023 int val;
3024
3025 if (olen < sizeof(int))
3026 return -EINVAL;
3027
3028 val = jiffies_to_msecs(*(int *)(table->data));
3029 if (put_user(val, (int __user *)oldval))
3030 return -EFAULT;
3031 if (put_user(sizeof(int), oldlenp))
1da177e4 3032 return -EFAULT;
1da177e4 3033 }
1da177e4
LT		 3034 }
3035 if (newval && newlen) {
3036 int new;
3037 if (newlen != sizeof(int))
3038 return -EINVAL;
3039 if (get_user(new, (int __user *)newval))
3040 return -EFAULT;
3041 *(int *)(table->data) = msecs_to_jiffies(new);
3042 }
3043 return 1;
3044}
3045
c4b8b769 3046
c4b8b769 3047
b89a8171 3048#else /* CONFIG_SYSCTL_SYSCALL */
1da177e4
LT		 3049
3050
1e7bfb21 3051SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1da177e4 3052{
0e009be8 3053 struct __sysctl_args tmp;
7058cb02 3054 int error;
0e009be8 3055
0e009be8
EB		 3056 if (copy_from_user(&tmp, args, sizeof(tmp)))
3057 return -EFAULT;
0e009be8 3058
7058cb02 3059 error = deprecated_sysctl_warning(&tmp);
b89a8171 3060
7058cb02
EB		 3061 /* If no error reading the parameters then just -ENOSYS ... */
3062 if (!error)
3063 error = -ENOSYS;
3064
3065 return error;
1da177e4
LT		 3066}
3067
f221e726 3068int sysctl_data(struct ctl_table *table,
49a0c458
EB		 3069 void __user *oldval, size_t __user *oldlenp,
3070 void __user *newval, size_t newlen)
3071{
3072 return -ENOSYS;
3073}
3074
f221e726 3075int sysctl_string(struct ctl_table *table,
1da177e4 3076 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3077 void __user *newval, size_t newlen)
1da177e4
LT		 3078{
3079 return -ENOSYS;
3080}
3081
f221e726 3082int sysctl_intvec(struct ctl_table *table,
1da177e4 3083 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3084 void __user *newval, size_t newlen)
1da177e4
LT		 3085{
3086 return -ENOSYS;
3087}
3088
f221e726 3089int sysctl_jiffies(struct ctl_table *table,
1da177e4 3090 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3091 void __user *newval, size_t newlen)
1da177e4
LT		 3092{
3093 return -ENOSYS;
3094}
3095
f221e726 3096int sysctl_ms_jiffies(struct ctl_table *table,
1da177e4 3097 void __user *oldval, size_t __user *oldlenp,
1f29bcd7 3098 void __user *newval, size_t newlen)
1da177e4
LT		 3099{
3100 return -ENOSYS;
3101}
3102
b89a8171 3103#endif /* CONFIG_SYSCTL_SYSCALL */
1da177e4 3104
7058cb02
EB		 3105static int deprecated_sysctl_warning(struct __sysctl_args *args)
3106{
3107 static int msg_count;
3108 int name[CTL_MAXNAME];
3109 int i;
3110
6fc48af8
TH		 3111 /* Check args->nlen. */
3112 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3113 return -ENOTDIR;
3114
7058cb02
EB		 3115 /* Read in the sysctl name for better debug message logging */
3116 for (i = 0; i < args->nlen; i++)
3117 if (get_user(name[i], args->name + i))
3118 return -EFAULT;
3119
3120 /* Ignore accesses to kernel.version */
3121 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3122 return 0;
3123
3124 if (msg_count < 5) {
3125 msg_count++;
3126 printk(KERN_INFO
3127 "warning: process `%s' used the deprecated sysctl "
3128 "system call with ", current->comm);
3129 for (i = 0; i < args->nlen; i++)
3130 printk("%d.", name[i]);
3131 printk("\n");
3132 }
3133 return 0;
3134}
3135
1da177e4
LT		 3136/*
3137 * No sense putting this after each symbol definition, twice,
3138 * exception granted :-)
3139 */
3140EXPORT_SYMBOL(proc_dointvec);
3141EXPORT_SYMBOL(proc_dointvec_jiffies);
3142EXPORT_SYMBOL(proc_dointvec_minmax);
3143EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3144EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3145EXPORT_SYMBOL(proc_dostring);
3146EXPORT_SYMBOL(proc_doulongvec_minmax);
3147EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3148EXPORT_SYMBOL(register_sysctl_table);
29e796fd 3149EXPORT_SYMBOL(register_sysctl_paths);
1da177e4
LT		 3150EXPORT_SYMBOL(sysctl_intvec);
3151EXPORT_SYMBOL(sysctl_jiffies);
3152EXPORT_SYMBOL(sysctl_ms_jiffies);
3153EXPORT_SYMBOL(sysctl_string);
49a0c458 3154EXPORT_SYMBOL(sysctl_data);
1da177e4 3155EXPORT_SYMBOL(unregister_sysctl_table);
kernel source for telekom puls (alcatel/mediatek)