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CRIS: Fix bugs in return value of atomic_inc_return and atomic_dec_return.
[wrt350n-kernel.git] / kernel / sysctl.c
blob8c98d8147d883ac977d08ff8189b7fd4c1042136
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
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>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/security.h>
41 #include <linux/initrd.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
48 #include <linux/reboot.h>
49
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
52
53 #ifdef CONFIG_X86
54 #include <asm/nmi.h>
55 #include <asm/stacktrace.h>
56 #include <asm/io.h>
57 #endif
58
59 static int deprecated_sysctl_warning(struct __sysctl_args *args);
60
61 #if defined(CONFIG_SYSCTL)
62
63 /* External variables not in a header file. */
64 extern int C_A_D;
65 extern int print_fatal_signals;
66 extern int sysctl_overcommit_memory;
67 extern int sysctl_overcommit_ratio;
68 extern int sysctl_panic_on_oom;
69 extern int sysctl_oom_kill_allocating_task;
70 extern int sysctl_oom_dump_tasks;
71 extern int max_threads;
72 extern int core_uses_pid;
73 extern int suid_dumpable;
74 extern char core_pattern[];
75 extern int pid_max;
76 extern int min_free_kbytes;
77 extern int printk_ratelimit_jiffies;
78 extern int printk_ratelimit_burst;
79 extern int pid_max_min, pid_max_max;
80 extern int sysctl_drop_caches;
81 extern int percpu_pagelist_fraction;
82 extern int compat_log;
83 extern int maps_protect;
84 extern int sysctl_stat_interval;
85 extern int latencytop_enabled;
86
87 /* Constants used for minimum and maximum */
88 #if defined(CONFIG_DETECT_SOFTLOCKUP) || defined(CONFIG_HIGHMEM)
89 static int one = 1;
90 #endif
91
92 #ifdef CONFIG_DETECT_SOFTLOCKUP
93 static int sixty = 60;
94 #endif
95
96 #ifdef CONFIG_MMU
97 static int two = 2;
98 #endif
99
100 static int zero;
101 static int one_hundred = 100;
102
103 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
104 static int maxolduid = 65535;
105 static int minolduid;
106 static int min_percpu_pagelist_fract = 8;
107
108 static int ngroups_max = NGROUPS_MAX;
109
110 #ifdef CONFIG_KMOD
111 extern char modprobe_path[];
112 #endif
113 #ifdef CONFIG_CHR_DEV_SG
114 extern int sg_big_buff;
115 #endif
116
117 #ifdef __sparc__
118 extern char reboot_command [];
119 extern int stop_a_enabled;
120 extern int scons_pwroff;
121 #endif
122
123 #ifdef __hppa__
124 extern int pwrsw_enabled;
125 extern int unaligned_enabled;
126 #endif
127
128 #ifdef CONFIG_S390
129 #ifdef CONFIG_MATHEMU
130 extern int sysctl_ieee_emulation_warnings;
131 #endif
132 extern int sysctl_userprocess_debug;
133 extern int spin_retry;
134 #endif
135
136 extern int sysctl_hz_timer;
137
138 #ifdef CONFIG_BSD_PROCESS_ACCT
139 extern int acct_parm[];
140 #endif
141
142 #ifdef CONFIG_IA64
143 extern int no_unaligned_warning;
144 #endif
145
146 #ifdef CONFIG_RT_MUTEXES
147 extern int max_lock_depth;
148 #endif
149
150 #ifdef CONFIG_SYSCTL_SYSCALL
151 static int parse_table(int __user *, int, void __user *, size_t __user *,
152 void __user *, size_t, struct ctl_table *);
153 #endif
154
155
156 #ifdef CONFIG_PROC_SYSCTL
157 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
158 void __user *buffer, size_t *lenp, loff_t *ppos);
159 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
160 void __user *buffer, size_t *lenp, loff_t *ppos);
161 #endif
162
163 static struct ctl_table root_table[];
164 static struct ctl_table_root sysctl_table_root;
165 static struct ctl_table_header root_table_header = {
166 .ctl_table = root_table,
167 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.header_list),
168 .root = &sysctl_table_root,
169 };
170 static struct ctl_table_root sysctl_table_root = {
171 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
172 .header_list = LIST_HEAD_INIT(root_table_header.ctl_entry),
173 };
174
175 static struct ctl_table kern_table[];
176 static struct ctl_table vm_table[];
177 static struct ctl_table fs_table[];
178 static struct ctl_table debug_table[];
179 static struct ctl_table dev_table[];
180 extern struct ctl_table random_table[];
181 #ifdef CONFIG_INOTIFY_USER
182 extern struct ctl_table inotify_table[];
183 #endif
184
185 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
186 int sysctl_legacy_va_layout;
187 #endif
188
189 extern int prove_locking;
190 extern int lock_stat;
191
192 /* The default sysctl tables: */
193
194 static struct ctl_table root_table[] = {
195 {
196 .ctl_name = CTL_KERN,
197 .procname = "kernel",
198 .mode = 0555,
199 .child = kern_table,
200 },
201 {
202 .ctl_name = CTL_VM,
203 .procname = "vm",
204 .mode = 0555,
205 .child = vm_table,
206 },
207 {
208 .ctl_name = CTL_FS,
209 .procname = "fs",
210 .mode = 0555,
211 .child = fs_table,
212 },
213 {
214 .ctl_name = CTL_DEBUG,
215 .procname = "debug",
216 .mode = 0555,
217 .child = debug_table,
218 },
219 {
220 .ctl_name = CTL_DEV,
221 .procname = "dev",
222 .mode = 0555,
223 .child = dev_table,
224 },
225 /*
226 * NOTE: do not add new entries to this table unless you have read
227 * Documentation/sysctl/ctl_unnumbered.txt
228 */
229 { .ctl_name = 0 }
230 };
231
232 #ifdef CONFIG_SCHED_DEBUG
233 static int min_sched_granularity_ns = 100000; /* 100 usecs */
234 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
235 static int min_wakeup_granularity_ns; /* 0 usecs */
236 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
237 #endif
238
239 static struct ctl_table kern_table[] = {
240 #ifdef CONFIG_SCHED_DEBUG
241 {
242 .ctl_name = CTL_UNNUMBERED,
243 .procname = "sched_min_granularity_ns",
244 .data = &sysctl_sched_min_granularity,
245 .maxlen = sizeof(unsigned int),
246 .mode = 0644,
247 .proc_handler = &sched_nr_latency_handler,
248 .strategy = &sysctl_intvec,
249 .extra1 = &min_sched_granularity_ns,
250 .extra2 = &max_sched_granularity_ns,
251 },
252 {
253 .ctl_name = CTL_UNNUMBERED,
254 .procname = "sched_latency_ns",
255 .data = &sysctl_sched_latency,
256 .maxlen = sizeof(unsigned int),
257 .mode = 0644,
258 .proc_handler = &sched_nr_latency_handler,
259 .strategy = &sysctl_intvec,
260 .extra1 = &min_sched_granularity_ns,
261 .extra2 = &max_sched_granularity_ns,
262 },
263 {
264 .ctl_name = CTL_UNNUMBERED,
265 .procname = "sched_wakeup_granularity_ns",
266 .data = &sysctl_sched_wakeup_granularity,
267 .maxlen = sizeof(unsigned int),
268 .mode = 0644,
269 .proc_handler = &proc_dointvec_minmax,
270 .strategy = &sysctl_intvec,
271 .extra1 = &min_wakeup_granularity_ns,
272 .extra2 = &max_wakeup_granularity_ns,
273 },
274 {
275 .ctl_name = CTL_UNNUMBERED,
276 .procname = "sched_batch_wakeup_granularity_ns",
277 .data = &sysctl_sched_batch_wakeup_granularity,
278 .maxlen = sizeof(unsigned int),
279 .mode = 0644,
280 .proc_handler = &proc_dointvec_minmax,
281 .strategy = &sysctl_intvec,
282 .extra1 = &min_wakeup_granularity_ns,
283 .extra2 = &max_wakeup_granularity_ns,
284 },
285 {
286 .ctl_name = CTL_UNNUMBERED,
287 .procname = "sched_child_runs_first",
288 .data = &sysctl_sched_child_runs_first,
289 .maxlen = sizeof(unsigned int),
290 .mode = 0644,
291 .proc_handler = &proc_dointvec,
292 },
293 {
294 .ctl_name = CTL_UNNUMBERED,
295 .procname = "sched_features",
296 .data = &sysctl_sched_features,
297 .maxlen = sizeof(unsigned int),
298 .mode = 0644,
299 .proc_handler = &proc_dointvec,
300 },
301 {
302 .ctl_name = CTL_UNNUMBERED,
303 .procname = "sched_migration_cost",
304 .data = &sysctl_sched_migration_cost,
305 .maxlen = sizeof(unsigned int),
306 .mode = 0644,
307 .proc_handler = &proc_dointvec,
308 },
309 {
310 .ctl_name = CTL_UNNUMBERED,
311 .procname = "sched_nr_migrate",
312 .data = &sysctl_sched_nr_migrate,
313 .maxlen = sizeof(unsigned int),
314 .mode = 0644,
315 .proc_handler = &proc_dointvec,
316 },
317 {
318 .ctl_name = CTL_UNNUMBERED,
319 .procname = "sched_rt_period_ms",
320 .data = &sysctl_sched_rt_period,
321 .maxlen = sizeof(unsigned int),
322 .mode = 0644,
323 .proc_handler = &proc_dointvec,
324 },
325 {
326 .ctl_name = CTL_UNNUMBERED,
327 .procname = "sched_rt_ratio",
328 .data = &sysctl_sched_rt_ratio,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = &proc_dointvec,
332 },
333 #if defined(CONFIG_FAIR_GROUP_SCHED) && defined(CONFIG_SMP)
334 {
335 .ctl_name = CTL_UNNUMBERED,
336 .procname = "sched_min_bal_int_shares",
337 .data = &sysctl_sched_min_bal_int_shares,
338 .maxlen = sizeof(unsigned int),
339 .mode = 0644,
340 .proc_handler = &proc_dointvec,
341 },
342 {
343 .ctl_name = CTL_UNNUMBERED,
344 .procname = "sched_max_bal_int_shares",
345 .data = &sysctl_sched_max_bal_int_shares,
346 .maxlen = sizeof(unsigned int),
347 .mode = 0644,
348 .proc_handler = &proc_dointvec,
349 },
350 #endif
351 #endif
352 {
353 .ctl_name = CTL_UNNUMBERED,
354 .procname = "sched_compat_yield",
355 .data = &sysctl_sched_compat_yield,
356 .maxlen = sizeof(unsigned int),
357 .mode = 0644,
358 .proc_handler = &proc_dointvec,
359 },
360 #ifdef CONFIG_PROVE_LOCKING
361 {
362 .ctl_name = CTL_UNNUMBERED,
363 .procname = "prove_locking",
364 .data = &prove_locking,
365 .maxlen = sizeof(int),
366 .mode = 0644,
367 .proc_handler = &proc_dointvec,
368 },
369 #endif
370 #ifdef CONFIG_LOCK_STAT
371 {
372 .ctl_name = CTL_UNNUMBERED,
373 .procname = "lock_stat",
374 .data = &lock_stat,
375 .maxlen = sizeof(int),
376 .mode = 0644,
377 .proc_handler = &proc_dointvec,
378 },
379 #endif
380 {
381 .ctl_name = KERN_PANIC,
382 .procname = "panic",
383 .data = &panic_timeout,
384 .maxlen = sizeof(int),
385 .mode = 0644,
386 .proc_handler = &proc_dointvec,
387 },
388 {
389 .ctl_name = KERN_CORE_USES_PID,
390 .procname = "core_uses_pid",
391 .data = &core_uses_pid,
392 .maxlen = sizeof(int),
393 .mode = 0644,
394 .proc_handler = &proc_dointvec,
395 },
396 {
397 .ctl_name = KERN_CORE_PATTERN,
398 .procname = "core_pattern",
399 .data = core_pattern,
400 .maxlen = CORENAME_MAX_SIZE,
401 .mode = 0644,
402 .proc_handler = &proc_dostring,
403 .strategy = &sysctl_string,
404 },
405 #ifdef CONFIG_PROC_SYSCTL
406 {
407 .procname = "tainted",
408 .data = &tainted,
409 .maxlen = sizeof(int),
410 .mode = 0644,
411 .proc_handler = &proc_dointvec_taint,
412 },
413 #endif
414 #ifdef CONFIG_LATENCYTOP
415 {
416 .procname = "latencytop",
417 .data = &latencytop_enabled,
418 .maxlen = sizeof(int),
419 .mode = 0644,
420 .proc_handler = &proc_dointvec,
421 },
422 #endif
423 #ifdef CONFIG_BLK_DEV_INITRD
424 {
425 .ctl_name = KERN_REALROOTDEV,
426 .procname = "real-root-dev",
427 .data = &real_root_dev,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = &proc_dointvec,
431 },
432 #endif
433 {
434 .ctl_name = CTL_UNNUMBERED,
435 .procname = "print-fatal-signals",
436 .data = &print_fatal_signals,
437 .maxlen = sizeof(int),
438 .mode = 0644,
439 .proc_handler = &proc_dointvec,
440 },
441 #ifdef __sparc__
442 {
443 .ctl_name = KERN_SPARC_REBOOT,
444 .procname = "reboot-cmd",
445 .data = reboot_command,
446 .maxlen = 256,
447 .mode = 0644,
448 .proc_handler = &proc_dostring,
449 .strategy = &sysctl_string,
450 },
451 {
452 .ctl_name = KERN_SPARC_STOP_A,
453 .procname = "stop-a",
454 .data = &stop_a_enabled,
455 .maxlen = sizeof (int),
456 .mode = 0644,
457 .proc_handler = &proc_dointvec,
458 },
459 {
460 .ctl_name = KERN_SPARC_SCONS_PWROFF,
461 .procname = "scons-poweroff",
462 .data = &scons_pwroff,
463 .maxlen = sizeof (int),
464 .mode = 0644,
465 .proc_handler = &proc_dointvec,
466 },
467 #endif
468 #ifdef __hppa__
469 {
470 .ctl_name = KERN_HPPA_PWRSW,
471 .procname = "soft-power",
472 .data = &pwrsw_enabled,
473 .maxlen = sizeof (int),
474 .mode = 0644,
475 .proc_handler = &proc_dointvec,
476 },
477 {
478 .ctl_name = KERN_HPPA_UNALIGNED,
479 .procname = "unaligned-trap",
480 .data = &unaligned_enabled,
481 .maxlen = sizeof (int),
482 .mode = 0644,
483 .proc_handler = &proc_dointvec,
484 },
485 #endif
486 {
487 .ctl_name = KERN_CTLALTDEL,
488 .procname = "ctrl-alt-del",
489 .data = &C_A_D,
490 .maxlen = sizeof(int),
491 .mode = 0644,
492 .proc_handler = &proc_dointvec,
493 },
494 {
495 .ctl_name = KERN_PRINTK,
496 .procname = "printk",
497 .data = &console_loglevel,
498 .maxlen = 4*sizeof(int),
499 .mode = 0644,
500 .proc_handler = &proc_dointvec,
501 },
502 #ifdef CONFIG_KMOD
503 {
504 .ctl_name = KERN_MODPROBE,
505 .procname = "modprobe",
506 .data = &modprobe_path,
507 .maxlen = KMOD_PATH_LEN,
508 .mode = 0644,
509 .proc_handler = &proc_dostring,
510 .strategy = &sysctl_string,
511 },
512 #endif
513 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
514 {
515 .ctl_name = KERN_HOTPLUG,
516 .procname = "hotplug",
517 .data = &uevent_helper,
518 .maxlen = UEVENT_HELPER_PATH_LEN,
519 .mode = 0644,
520 .proc_handler = &proc_dostring,
521 .strategy = &sysctl_string,
522 },
523 #endif
524 #ifdef CONFIG_CHR_DEV_SG
525 {
526 .ctl_name = KERN_SG_BIG_BUFF,
527 .procname = "sg-big-buff",
528 .data = &sg_big_buff,
529 .maxlen = sizeof (int),
530 .mode = 0444,
531 .proc_handler = &proc_dointvec,
532 },
533 #endif
534 #ifdef CONFIG_BSD_PROCESS_ACCT
535 {
536 .ctl_name = KERN_ACCT,
537 .procname = "acct",
538 .data = &acct_parm,
539 .maxlen = 3*sizeof(int),
540 .mode = 0644,
541 .proc_handler = &proc_dointvec,
542 },
543 #endif
544 #ifdef CONFIG_MAGIC_SYSRQ
545 {
546 .ctl_name = KERN_SYSRQ,
547 .procname = "sysrq",
548 .data = &__sysrq_enabled,
549 .maxlen = sizeof (int),
550 .mode = 0644,
551 .proc_handler = &proc_dointvec,
552 },
553 #endif
554 #ifdef CONFIG_PROC_SYSCTL
555 {
556 .procname = "cad_pid",
557 .data = NULL,
558 .maxlen = sizeof (int),
559 .mode = 0600,
560 .proc_handler = &proc_do_cad_pid,
561 },
562 #endif
563 {
564 .ctl_name = KERN_MAX_THREADS,
565 .procname = "threads-max",
566 .data = &max_threads,
567 .maxlen = sizeof(int),
568 .mode = 0644,
569 .proc_handler = &proc_dointvec,
570 },
571 {
572 .ctl_name = KERN_RANDOM,
573 .procname = "random",
574 .mode = 0555,
575 .child = random_table,
576 },
577 {
578 .ctl_name = KERN_OVERFLOWUID,
579 .procname = "overflowuid",
580 .data = &overflowuid,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = &proc_dointvec_minmax,
584 .strategy = &sysctl_intvec,
585 .extra1 = &minolduid,
586 .extra2 = &maxolduid,
587 },
588 {
589 .ctl_name = KERN_OVERFLOWGID,
590 .procname = "overflowgid",
591 .data = &overflowgid,
592 .maxlen = sizeof(int),
593 .mode = 0644,
594 .proc_handler = &proc_dointvec_minmax,
595 .strategy = &sysctl_intvec,
596 .extra1 = &minolduid,
597 .extra2 = &maxolduid,
598 },
599 #ifdef CONFIG_S390
600 #ifdef CONFIG_MATHEMU
601 {
602 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
603 .procname = "ieee_emulation_warnings",
604 .data = &sysctl_ieee_emulation_warnings,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = &proc_dointvec,
608 },
609 #endif
610 #ifdef CONFIG_NO_IDLE_HZ
611 {
612 .ctl_name = KERN_HZ_TIMER,
613 .procname = "hz_timer",
614 .data = &sysctl_hz_timer,
615 .maxlen = sizeof(int),
616 .mode = 0644,
617 .proc_handler = &proc_dointvec,
618 },
619 #endif
620 {
621 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
622 .procname = "userprocess_debug",
623 .data = &sysctl_userprocess_debug,
624 .maxlen = sizeof(int),
625 .mode = 0644,
626 .proc_handler = &proc_dointvec,
627 },
628 #endif
629 {
630 .ctl_name = KERN_PIDMAX,
631 .procname = "pid_max",
632 .data = &pid_max,
633 .maxlen = sizeof (int),
634 .mode = 0644,
635 .proc_handler = &proc_dointvec_minmax,
636 .strategy = sysctl_intvec,
637 .extra1 = &pid_max_min,
638 .extra2 = &pid_max_max,
639 },
640 {
641 .ctl_name = KERN_PANIC_ON_OOPS,
642 .procname = "panic_on_oops",
643 .data = &panic_on_oops,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 .proc_handler = &proc_dointvec,
647 },
648 {
649 .ctl_name = KERN_PRINTK_RATELIMIT,
650 .procname = "printk_ratelimit",
651 .data = &printk_ratelimit_jiffies,
652 .maxlen = sizeof(int),
653 .mode = 0644,
654 .proc_handler = &proc_dointvec_jiffies,
655 .strategy = &sysctl_jiffies,
656 },
657 {
658 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
659 .procname = "printk_ratelimit_burst",
660 .data = &printk_ratelimit_burst,
661 .maxlen = sizeof(int),
662 .mode = 0644,
663 .proc_handler = &proc_dointvec,
664 },
665 {
666 .ctl_name = KERN_NGROUPS_MAX,
667 .procname = "ngroups_max",
668 .data = &ngroups_max,
669 .maxlen = sizeof (int),
670 .mode = 0444,
671 .proc_handler = &proc_dointvec,
672 },
673 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
674 {
675 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
676 .procname = "unknown_nmi_panic",
677 .data = &unknown_nmi_panic,
678 .maxlen = sizeof (int),
679 .mode = 0644,
680 .proc_handler = &proc_dointvec,
681 },
682 {
683 .procname = "nmi_watchdog",
684 .data = &nmi_watchdog_enabled,
685 .maxlen = sizeof (int),
686 .mode = 0644,
687 .proc_handler = &proc_nmi_enabled,
688 },
689 #endif
690 #if defined(CONFIG_X86)
691 {
692 .ctl_name = KERN_PANIC_ON_NMI,
693 .procname = "panic_on_unrecovered_nmi",
694 .data = &panic_on_unrecovered_nmi,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = &proc_dointvec,
698 },
699 {
700 .ctl_name = KERN_BOOTLOADER_TYPE,
701 .procname = "bootloader_type",
702 .data = &bootloader_type,
703 .maxlen = sizeof (int),
704 .mode = 0444,
705 .proc_handler = &proc_dointvec,
706 },
707 {
708 .ctl_name = CTL_UNNUMBERED,
709 .procname = "kstack_depth_to_print",
710 .data = &kstack_depth_to_print,
711 .maxlen = sizeof(int),
712 .mode = 0644,
713 .proc_handler = &proc_dointvec,
714 },
715 {
716 .ctl_name = CTL_UNNUMBERED,
717 .procname = "io_delay_type",
718 .data = &io_delay_type,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = &proc_dointvec,
722 },
723 #endif
724 #if defined(CONFIG_MMU)
725 {
726 .ctl_name = KERN_RANDOMIZE,
727 .procname = "randomize_va_space",
728 .data = &randomize_va_space,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = &proc_dointvec,
732 },
733 #endif
734 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
735 {
736 .ctl_name = KERN_SPIN_RETRY,
737 .procname = "spin_retry",
738 .data = &spin_retry,
739 .maxlen = sizeof (int),
740 .mode = 0644,
741 .proc_handler = &proc_dointvec,
742 },
743 #endif
744 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
745 {
746 .procname = "acpi_video_flags",
747 .data = &acpi_realmode_flags,
748 .maxlen = sizeof (unsigned long),
749 .mode = 0644,
750 .proc_handler = &proc_doulongvec_minmax,
751 },
752 #endif
753 #ifdef CONFIG_IA64
754 {
755 .ctl_name = KERN_IA64_UNALIGNED,
756 .procname = "ignore-unaligned-usertrap",
757 .data = &no_unaligned_warning,
758 .maxlen = sizeof (int),
759 .mode = 0644,
760 .proc_handler = &proc_dointvec,
761 },
762 #endif
763 #ifdef CONFIG_DETECT_SOFTLOCKUP
764 {
765 .ctl_name = CTL_UNNUMBERED,
766 .procname = "softlockup_thresh",
767 .data = &softlockup_thresh,
768 .maxlen = sizeof(unsigned long),
769 .mode = 0644,
770 .proc_handler = &proc_doulongvec_minmax,
771 .strategy = &sysctl_intvec,
772 .extra1 = &one,
773 .extra2 = &sixty,
774 },
775 {
776 .ctl_name = CTL_UNNUMBERED,
777 .procname = "hung_task_check_count",
778 .data = &sysctl_hung_task_check_count,
779 .maxlen = sizeof(unsigned long),
780 .mode = 0644,
781 .proc_handler = &proc_doulongvec_minmax,
782 .strategy = &sysctl_intvec,
783 },
784 {
785 .ctl_name = CTL_UNNUMBERED,
786 .procname = "hung_task_timeout_secs",
787 .data = &sysctl_hung_task_timeout_secs,
788 .maxlen = sizeof(unsigned long),
789 .mode = 0644,
790 .proc_handler = &proc_doulongvec_minmax,
791 .strategy = &sysctl_intvec,
792 },
793 {
794 .ctl_name = CTL_UNNUMBERED,
795 .procname = "hung_task_warnings",
796 .data = &sysctl_hung_task_warnings,
797 .maxlen = sizeof(unsigned long),
798 .mode = 0644,
799 .proc_handler = &proc_doulongvec_minmax,
800 .strategy = &sysctl_intvec,
801 },
802 #endif
803 #ifdef CONFIG_COMPAT
804 {
805 .ctl_name = KERN_COMPAT_LOG,
806 .procname = "compat-log",
807 .data = &compat_log,
808 .maxlen = sizeof (int),
809 .mode = 0644,
810 .proc_handler = &proc_dointvec,
811 },
812 #endif
813 #ifdef CONFIG_RT_MUTEXES
814 {
815 .ctl_name = KERN_MAX_LOCK_DEPTH,
816 .procname = "max_lock_depth",
817 .data = &max_lock_depth,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = &proc_dointvec,
821 },
822 #endif
823 #ifdef CONFIG_PROC_FS
824 {
825 .ctl_name = CTL_UNNUMBERED,
826 .procname = "maps_protect",
827 .data = &maps_protect,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = &proc_dointvec,
831 },
832 #endif
833 {
834 .ctl_name = CTL_UNNUMBERED,
835 .procname = "poweroff_cmd",
836 .data = &poweroff_cmd,
837 .maxlen = POWEROFF_CMD_PATH_LEN,
838 .mode = 0644,
839 .proc_handler = &proc_dostring,
840 .strategy = &sysctl_string,
841 },
842 /*
843 * NOTE: do not add new entries to this table unless you have read
844 * Documentation/sysctl/ctl_unnumbered.txt
845 */
846 { .ctl_name = 0 }
847 };
848
849 static struct ctl_table vm_table[] = {
850 {
851 .ctl_name = VM_OVERCOMMIT_MEMORY,
852 .procname = "overcommit_memory",
853 .data = &sysctl_overcommit_memory,
854 .maxlen = sizeof(sysctl_overcommit_memory),
855 .mode = 0644,
856 .proc_handler = &proc_dointvec,
857 },
858 {
859 .ctl_name = VM_PANIC_ON_OOM,
860 .procname = "panic_on_oom",
861 .data = &sysctl_panic_on_oom,
862 .maxlen = sizeof(sysctl_panic_on_oom),
863 .mode = 0644,
864 .proc_handler = &proc_dointvec,
865 },
866 {
867 .ctl_name = CTL_UNNUMBERED,
868 .procname = "oom_kill_allocating_task",
869 .data = &sysctl_oom_kill_allocating_task,
870 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
871 .mode = 0644,
872 .proc_handler = &proc_dointvec,
873 },
874 {
875 .ctl_name = CTL_UNNUMBERED,
876 .procname = "oom_dump_tasks",
877 .data = &sysctl_oom_dump_tasks,
878 .maxlen = sizeof(sysctl_oom_dump_tasks),
879 .mode = 0644,
880 .proc_handler = &proc_dointvec,
881 },
882 {
883 .ctl_name = VM_OVERCOMMIT_RATIO,
884 .procname = "overcommit_ratio",
885 .data = &sysctl_overcommit_ratio,
886 .maxlen = sizeof(sysctl_overcommit_ratio),
887 .mode = 0644,
888 .proc_handler = &proc_dointvec,
889 },
890 {
891 .ctl_name = VM_PAGE_CLUSTER,
892 .procname = "page-cluster",
893 .data = &page_cluster,
894 .maxlen = sizeof(int),
895 .mode = 0644,
896 .proc_handler = &proc_dointvec,
897 },
898 {
899 .ctl_name = VM_DIRTY_BACKGROUND,
900 .procname = "dirty_background_ratio",
901 .data = &dirty_background_ratio,
902 .maxlen = sizeof(dirty_background_ratio),
903 .mode = 0644,
904 .proc_handler = &proc_dointvec_minmax,
905 .strategy = &sysctl_intvec,
906 .extra1 = &zero,
907 .extra2 = &one_hundred,
908 },
909 {
910 .ctl_name = VM_DIRTY_RATIO,
911 .procname = "dirty_ratio",
912 .data = &vm_dirty_ratio,
913 .maxlen = sizeof(vm_dirty_ratio),
914 .mode = 0644,
915 .proc_handler = &dirty_ratio_handler,
916 .strategy = &sysctl_intvec,
917 .extra1 = &zero,
918 .extra2 = &one_hundred,
919 },
920 {
921 .procname = "dirty_writeback_centisecs",
922 .data = &dirty_writeback_interval,
923 .maxlen = sizeof(dirty_writeback_interval),
924 .mode = 0644,
925 .proc_handler = &dirty_writeback_centisecs_handler,
926 },
927 {
928 .procname = "dirty_expire_centisecs",
929 .data = &dirty_expire_interval,
930 .maxlen = sizeof(dirty_expire_interval),
931 .mode = 0644,
932 .proc_handler = &proc_dointvec_userhz_jiffies,
933 },
934 {
935 .ctl_name = VM_NR_PDFLUSH_THREADS,
936 .procname = "nr_pdflush_threads",
937 .data = &nr_pdflush_threads,
938 .maxlen = sizeof nr_pdflush_threads,
939 .mode = 0444 /* read-only*/,
940 .proc_handler = &proc_dointvec,
941 },
942 {
943 .ctl_name = VM_SWAPPINESS,
944 .procname = "swappiness",
945 .data = &vm_swappiness,
946 .maxlen = sizeof(vm_swappiness),
947 .mode = 0644,
948 .proc_handler = &proc_dointvec_minmax,
949 .strategy = &sysctl_intvec,
950 .extra1 = &zero,
951 .extra2 = &one_hundred,
952 },
953 #ifdef CONFIG_HUGETLB_PAGE
954 {
955 .procname = "nr_hugepages",
956 .data = &max_huge_pages,
957 .maxlen = sizeof(unsigned long),
958 .mode = 0644,
959 .proc_handler = &hugetlb_sysctl_handler,
960 .extra1 = (void *)&hugetlb_zero,
961 .extra2 = (void *)&hugetlb_infinity,
962 },
963 {
964 .ctl_name = VM_HUGETLB_GROUP,
965 .procname = "hugetlb_shm_group",
966 .data = &sysctl_hugetlb_shm_group,
967 .maxlen = sizeof(gid_t),
968 .mode = 0644,
969 .proc_handler = &proc_dointvec,
970 },
971 {
972 .ctl_name = CTL_UNNUMBERED,
973 .procname = "hugepages_treat_as_movable",
974 .data = &hugepages_treat_as_movable,
975 .maxlen = sizeof(int),
976 .mode = 0644,
977 .proc_handler = &hugetlb_treat_movable_handler,
978 },
979 {
980 .ctl_name = CTL_UNNUMBERED,
981 .procname = "nr_overcommit_hugepages",
982 .data = &nr_overcommit_huge_pages,
983 .maxlen = sizeof(nr_overcommit_huge_pages),
984 .mode = 0644,
985 .proc_handler = &proc_doulongvec_minmax,
986 },
987 #endif
988 {
989 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
990 .procname = "lowmem_reserve_ratio",
991 .data = &sysctl_lowmem_reserve_ratio,
992 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
993 .mode = 0644,
994 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
995 .strategy = &sysctl_intvec,
996 },
997 {
998 .ctl_name = VM_DROP_PAGECACHE,
999 .procname = "drop_caches",
1000 .data = &sysctl_drop_caches,
1001 .maxlen = sizeof(int),
1002 .mode = 0644,
1003 .proc_handler = drop_caches_sysctl_handler,
1004 .strategy = &sysctl_intvec,
1005 },
1006 {
1007 .ctl_name = VM_MIN_FREE_KBYTES,
1008 .procname = "min_free_kbytes",
1009 .data = &min_free_kbytes,
1010 .maxlen = sizeof(min_free_kbytes),
1011 .mode = 0644,
1012 .proc_handler = &min_free_kbytes_sysctl_handler,
1013 .strategy = &sysctl_intvec,
1014 .extra1 = &zero,
1015 },
1016 {
1017 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
1018 .procname = "percpu_pagelist_fraction",
1019 .data = &percpu_pagelist_fraction,
1020 .maxlen = sizeof(percpu_pagelist_fraction),
1021 .mode = 0644,
1022 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
1023 .strategy = &sysctl_intvec,
1024 .extra1 = &min_percpu_pagelist_fract,
1025 },
1026 #ifdef CONFIG_MMU
1027 {
1028 .ctl_name = VM_MAX_MAP_COUNT,
1029 .procname = "max_map_count",
1030 .data = &sysctl_max_map_count,
1031 .maxlen = sizeof(sysctl_max_map_count),
1032 .mode = 0644,
1033 .proc_handler = &proc_dointvec
1034 },
1035 #endif
1036 {
1037 .ctl_name = VM_LAPTOP_MODE,
1038 .procname = "laptop_mode",
1039 .data = &laptop_mode,
1040 .maxlen = sizeof(laptop_mode),
1041 .mode = 0644,
1042 .proc_handler = &proc_dointvec_jiffies,
1043 .strategy = &sysctl_jiffies,
1044 },
1045 {
1046 .ctl_name = VM_BLOCK_DUMP,
1047 .procname = "block_dump",
1048 .data = &block_dump,
1049 .maxlen = sizeof(block_dump),
1050 .mode = 0644,
1051 .proc_handler = &proc_dointvec,
1052 .strategy = &sysctl_intvec,
1053 .extra1 = &zero,
1054 },
1055 {
1056 .ctl_name = VM_VFS_CACHE_PRESSURE,
1057 .procname = "vfs_cache_pressure",
1058 .data = &sysctl_vfs_cache_pressure,
1059 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1060 .mode = 0644,
1061 .proc_handler = &proc_dointvec,
1062 .strategy = &sysctl_intvec,
1063 .extra1 = &zero,
1064 },
1065 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1066 {
1067 .ctl_name = VM_LEGACY_VA_LAYOUT,
1068 .procname = "legacy_va_layout",
1069 .data = &sysctl_legacy_va_layout,
1070 .maxlen = sizeof(sysctl_legacy_va_layout),
1071 .mode = 0644,
1072 .proc_handler = &proc_dointvec,
1073 .strategy = &sysctl_intvec,
1074 .extra1 = &zero,
1075 },
1076 #endif
1077 #ifdef CONFIG_NUMA
1078 {
1079 .ctl_name = VM_ZONE_RECLAIM_MODE,
1080 .procname = "zone_reclaim_mode",
1081 .data = &zone_reclaim_mode,
1082 .maxlen = sizeof(zone_reclaim_mode),
1083 .mode = 0644,
1084 .proc_handler = &proc_dointvec,
1085 .strategy = &sysctl_intvec,
1086 .extra1 = &zero,
1087 },
1088 {
1089 .ctl_name = VM_MIN_UNMAPPED,
1090 .procname = "min_unmapped_ratio",
1091 .data = &sysctl_min_unmapped_ratio,
1092 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1093 .mode = 0644,
1094 .proc_handler = &sysctl_min_unmapped_ratio_sysctl_handler,
1095 .strategy = &sysctl_intvec,
1096 .extra1 = &zero,
1097 .extra2 = &one_hundred,
1098 },
1099 {
1100 .ctl_name = VM_MIN_SLAB,
1101 .procname = "min_slab_ratio",
1102 .data = &sysctl_min_slab_ratio,
1103 .maxlen = sizeof(sysctl_min_slab_ratio),
1104 .mode = 0644,
1105 .proc_handler = &sysctl_min_slab_ratio_sysctl_handler,
1106 .strategy = &sysctl_intvec,
1107 .extra1 = &zero,
1108 .extra2 = &one_hundred,
1109 },
1110 #endif
1111 #ifdef CONFIG_SMP
1112 {
1113 .ctl_name = CTL_UNNUMBERED,
1114 .procname = "stat_interval",
1115 .data = &sysctl_stat_interval,
1116 .maxlen = sizeof(sysctl_stat_interval),
1117 .mode = 0644,
1118 .proc_handler = &proc_dointvec_jiffies,
1119 .strategy = &sysctl_jiffies,
1120 },
1121 #endif
1122 #ifdef CONFIG_SECURITY
1123 {
1124 .ctl_name = CTL_UNNUMBERED,
1125 .procname = "mmap_min_addr",
1126 .data = &mmap_min_addr,
1127 .maxlen = sizeof(unsigned long),
1128 .mode = 0644,
1129 .proc_handler = &proc_doulongvec_minmax,
1130 },
1131 #endif
1132 #ifdef CONFIG_NUMA
1133 {
1134 .ctl_name = CTL_UNNUMBERED,
1135 .procname = "numa_zonelist_order",
1136 .data = &numa_zonelist_order,
1137 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1138 .mode = 0644,
1139 .proc_handler = &numa_zonelist_order_handler,
1140 .strategy = &sysctl_string,
1141 },
1142 #endif
1143 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1144 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1145 {
1146 .ctl_name = VM_VDSO_ENABLED,
1147 .procname = "vdso_enabled",
1148 .data = &vdso_enabled,
1149 .maxlen = sizeof(vdso_enabled),
1150 .mode = 0644,
1151 .proc_handler = &proc_dointvec,
1152 .strategy = &sysctl_intvec,
1153 .extra1 = &zero,
1154 },
1155 #endif
1156 #ifdef CONFIG_HIGHMEM
1157 {
1158 .ctl_name = CTL_UNNUMBERED,
1159 .procname = "highmem_is_dirtyable",
1160 .data = &vm_highmem_is_dirtyable,
1161 .maxlen = sizeof(vm_highmem_is_dirtyable),
1162 .mode = 0644,
1163 .proc_handler = &proc_dointvec_minmax,
1164 .strategy = &sysctl_intvec,
1165 .extra1 = &zero,
1166 .extra2 = &one,
1167 },
1168 #endif
1169 /*
1170 * NOTE: do not add new entries to this table unless you have read
1171 * Documentation/sysctl/ctl_unnumbered.txt
1172 */
1173 { .ctl_name = 0 }
1174 };
1175
1176 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1177 static struct ctl_table binfmt_misc_table[] = {
1178 { .ctl_name = 0 }
1179 };
1180 #endif
1181
1182 static struct ctl_table fs_table[] = {
1183 {
1184 .ctl_name = FS_NRINODE,
1185 .procname = "inode-nr",
1186 .data = &inodes_stat,
1187 .maxlen = 2*sizeof(int),
1188 .mode = 0444,
1189 .proc_handler = &proc_dointvec,
1190 },
1191 {
1192 .ctl_name = FS_STATINODE,
1193 .procname = "inode-state",
1194 .data = &inodes_stat,
1195 .maxlen = 7*sizeof(int),
1196 .mode = 0444,
1197 .proc_handler = &proc_dointvec,
1198 },
1199 {
1200 .procname = "file-nr",
1201 .data = &files_stat,
1202 .maxlen = 3*sizeof(int),
1203 .mode = 0444,
1204 .proc_handler = &proc_nr_files,
1205 },
1206 {
1207 .ctl_name = FS_MAXFILE,
1208 .procname = "file-max",
1209 .data = &files_stat.max_files,
1210 .maxlen = sizeof(int),
1211 .mode = 0644,
1212 .proc_handler = &proc_dointvec,
1213 },
1214 {
1215 .ctl_name = CTL_UNNUMBERED,
1216 .procname = "nr_open",
1217 .data = &sysctl_nr_open,
1218 .maxlen = sizeof(int),
1219 .mode = 0644,
1220 .proc_handler = &proc_dointvec,
1221 },
1222 {
1223 .ctl_name = FS_DENTRY,
1224 .procname = "dentry-state",
1225 .data = &dentry_stat,
1226 .maxlen = 6*sizeof(int),
1227 .mode = 0444,
1228 .proc_handler = &proc_dointvec,
1229 },
1230 {
1231 .ctl_name = FS_OVERFLOWUID,
1232 .procname = "overflowuid",
1233 .data = &fs_overflowuid,
1234 .maxlen = sizeof(int),
1235 .mode = 0644,
1236 .proc_handler = &proc_dointvec_minmax,
1237 .strategy = &sysctl_intvec,
1238 .extra1 = &minolduid,
1239 .extra2 = &maxolduid,
1240 },
1241 {
1242 .ctl_name = FS_OVERFLOWGID,
1243 .procname = "overflowgid",
1244 .data = &fs_overflowgid,
1245 .maxlen = sizeof(int),
1246 .mode = 0644,
1247 .proc_handler = &proc_dointvec_minmax,
1248 .strategy = &sysctl_intvec,
1249 .extra1 = &minolduid,
1250 .extra2 = &maxolduid,
1251 },
1252 {
1253 .ctl_name = FS_LEASES,
1254 .procname = "leases-enable",
1255 .data = &leases_enable,
1256 .maxlen = sizeof(int),
1257 .mode = 0644,
1258 .proc_handler = &proc_dointvec,
1259 },
1260 #ifdef CONFIG_DNOTIFY
1261 {
1262 .ctl_name = FS_DIR_NOTIFY,
1263 .procname = "dir-notify-enable",
1264 .data = &dir_notify_enable,
1265 .maxlen = sizeof(int),
1266 .mode = 0644,
1267 .proc_handler = &proc_dointvec,
1268 },
1269 #endif
1270 #ifdef CONFIG_MMU
1271 {
1272 .ctl_name = FS_LEASE_TIME,
1273 .procname = "lease-break-time",
1274 .data = &lease_break_time,
1275 .maxlen = sizeof(int),
1276 .mode = 0644,
1277 .proc_handler = &proc_dointvec_minmax,
1278 .strategy = &sysctl_intvec,
1279 .extra1 = &zero,
1280 .extra2 = &two,
1281 },
1282 {
1283 .procname = "aio-nr",
1284 .data = &aio_nr,
1285 .maxlen = sizeof(aio_nr),
1286 .mode = 0444,
1287 .proc_handler = &proc_doulongvec_minmax,
1288 },
1289 {
1290 .procname = "aio-max-nr",
1291 .data = &aio_max_nr,
1292 .maxlen = sizeof(aio_max_nr),
1293 .mode = 0644,
1294 .proc_handler = &proc_doulongvec_minmax,
1295 },
1296 #ifdef CONFIG_INOTIFY_USER
1297 {
1298 .ctl_name = FS_INOTIFY,
1299 .procname = "inotify",
1300 .mode = 0555,
1301 .child = inotify_table,
1302 },
1303 #endif
1304 #endif
1305 {
1306 .ctl_name = KERN_SETUID_DUMPABLE,
1307 .procname = "suid_dumpable",
1308 .data = &suid_dumpable,
1309 .maxlen = sizeof(int),
1310 .mode = 0644,
1311 .proc_handler = &proc_dointvec,
1312 },
1313 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1314 {
1315 .ctl_name = CTL_UNNUMBERED,
1316 .procname = "binfmt_misc",
1317 .mode = 0555,
1318 .child = binfmt_misc_table,
1319 },
1320 #endif
1321 /*
1322 * NOTE: do not add new entries to this table unless you have read
1323 * Documentation/sysctl/ctl_unnumbered.txt
1324 */
1325 { .ctl_name = 0 }
1326 };
1327
1328 static struct ctl_table debug_table[] = {
1329 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1330 {
1331 .ctl_name = CTL_UNNUMBERED,
1332 .procname = "exception-trace",
1333 .data = &show_unhandled_signals,
1334 .maxlen = sizeof(int),
1335 .mode = 0644,
1336 .proc_handler = proc_dointvec
1337 },
1338 #endif
1339 { .ctl_name = 0 }
1340 };
1341
1342 static struct ctl_table dev_table[] = {
1343 { .ctl_name = 0 }
1344 };
1345
1346 static DEFINE_SPINLOCK(sysctl_lock);
1347
1348 /* called under sysctl_lock */
1349 static int use_table(struct ctl_table_header *p)
1350 {
1351 if (unlikely(p->unregistering))
1352 return 0;
1353 p->used++;
1354 return 1;
1355 }
1356
1357 /* called under sysctl_lock */
1358 static void unuse_table(struct ctl_table_header *p)
1359 {
1360 if (!--p->used)
1361 if (unlikely(p->unregistering))
1362 complete(p->unregistering);
1363 }
1364
1365 /* called under sysctl_lock, will reacquire if has to wait */
1366 static void start_unregistering(struct ctl_table_header *p)
1367 {
1368 /*
1369 * if p->used is 0, nobody will ever touch that entry again;
1370 * we'll eliminate all paths to it before dropping sysctl_lock
1371 */
1372 if (unlikely(p->used)) {
1373 struct completion wait;
1374 init_completion(&wait);
1375 p->unregistering = &wait;
1376 spin_unlock(&sysctl_lock);
1377 wait_for_completion(&wait);
1378 spin_lock(&sysctl_lock);
1379 }
1380 /*
1381 * do not remove from the list until nobody holds it; walking the
1382 * list in do_sysctl() relies on that.
1383 */
1384 list_del_init(&p->ctl_entry);
1385 }
1386
1387 void sysctl_head_finish(struct ctl_table_header *head)
1388 {
1389 if (!head)
1390 return;
1391 spin_lock(&sysctl_lock);
1392 unuse_table(head);
1393 spin_unlock(&sysctl_lock);
1394 }
1395
1396 static struct list_head *
1397 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1398 {
1399 struct list_head *header_list;
1400 header_list = &root->header_list;
1401 if (root->lookup)
1402 header_list = root->lookup(root, namespaces);
1403 return header_list;
1404 }
1405
1406 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1407 struct ctl_table_header *prev)
1408 {
1409 struct ctl_table_root *root;
1410 struct list_head *header_list;
1411 struct ctl_table_header *head;
1412 struct list_head *tmp;
1413
1414 spin_lock(&sysctl_lock);
1415 if (prev) {
1416 head = prev;
1417 tmp = &prev->ctl_entry;
1418 unuse_table(prev);
1419 goto next;
1420 }
1421 tmp = &root_table_header.ctl_entry;
1422 for (;;) {
1423 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1424
1425 if (!use_table(head))
1426 goto next;
1427 spin_unlock(&sysctl_lock);
1428 return head;
1429 next:
1430 root = head->root;
1431 tmp = tmp->next;
1432 header_list = lookup_header_list(root, namespaces);
1433 if (tmp != header_list)
1434 continue;
1435
1436 do {
1437 root = list_entry(root->root_list.next,
1438 struct ctl_table_root, root_list);
1439 if (root == &sysctl_table_root)
1440 goto out;
1441 header_list = lookup_header_list(root, namespaces);
1442 } while (list_empty(header_list));
1443 tmp = header_list->next;
1444 }
1445 out:
1446 spin_unlock(&sysctl_lock);
1447 return NULL;
1448 }
1449
1450 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1451 {
1452 return __sysctl_head_next(current->nsproxy, prev);
1453 }
1454
1455 void register_sysctl_root(struct ctl_table_root *root)
1456 {
1457 spin_lock(&sysctl_lock);
1458 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1459 spin_unlock(&sysctl_lock);
1460 }
1461
1462 #ifdef CONFIG_SYSCTL_SYSCALL
1463 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1464 void __user *newval, size_t newlen)
1465 {
1466 struct ctl_table_header *head;
1467 int error = -ENOTDIR;
1468
1469 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1470 return -ENOTDIR;
1471 if (oldval) {
1472 int old_len;
1473 if (!oldlenp || get_user(old_len, oldlenp))
1474 return -EFAULT;
1475 }
1476
1477 for (head = sysctl_head_next(NULL); head;
1478 head = sysctl_head_next(head)) {
1479 error = parse_table(name, nlen, oldval, oldlenp,
1480 newval, newlen, head->ctl_table);
1481 if (error != -ENOTDIR) {
1482 sysctl_head_finish(head);
1483 break;
1484 }
1485 }
1486 return error;
1487 }
1488
1489 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1490 {
1491 struct __sysctl_args tmp;
1492 int error;
1493
1494 if (copy_from_user(&tmp, args, sizeof(tmp)))
1495 return -EFAULT;
1496
1497 error = deprecated_sysctl_warning(&tmp);
1498 if (error)
1499 goto out;
1500
1501 lock_kernel();
1502 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1503 tmp.newval, tmp.newlen);
1504 unlock_kernel();
1505 out:
1506 return error;
1507 }
1508 #endif /* CONFIG_SYSCTL_SYSCALL */
1509
1510 /*
1511 * sysctl_perm does NOT grant the superuser all rights automatically, because
1512 * some sysctl variables are readonly even to root.
1513 */
1514
1515 static int test_perm(int mode, int op)
1516 {
1517 if (!current->euid)
1518 mode >>= 6;
1519 else if (in_egroup_p(0))
1520 mode >>= 3;
1521 if ((mode & op & 0007) == op)
1522 return 0;
1523 return -EACCES;
1524 }
1525
1526 int sysctl_perm(struct ctl_table *table, int op)
1527 {
1528 int error;
1529 error = security_sysctl(table, op);
1530 if (error)
1531 return error;
1532 return test_perm(table->mode, op);
1533 }
1534
1535 #ifdef CONFIG_SYSCTL_SYSCALL
1536 static int parse_table(int __user *name, int nlen,
1537 void __user *oldval, size_t __user *oldlenp,
1538 void __user *newval, size_t newlen,
1539 struct ctl_table *table)
1540 {
1541 int n;
1542 repeat:
1543 if (!nlen)
1544 return -ENOTDIR;
1545 if (get_user(n, name))
1546 return -EFAULT;
1547 for ( ; table->ctl_name || table->procname; table++) {
1548 if (!table->ctl_name)
1549 continue;
1550 if (n == table->ctl_name) {
1551 int error;
1552 if (table->child) {
1553 if (sysctl_perm(table, 001))
1554 return -EPERM;
1555 name++;
1556 nlen--;
1557 table = table->child;
1558 goto repeat;
1559 }
1560 error = do_sysctl_strategy(table, name, nlen,
1561 oldval, oldlenp,
1562 newval, newlen);
1563 return error;
1564 }
1565 }
1566 return -ENOTDIR;
1567 }
1568
1569 /* Perform the actual read/write of a sysctl table entry. */
1570 int do_sysctl_strategy (struct ctl_table *table,
1571 int __user *name, int nlen,
1572 void __user *oldval, size_t __user *oldlenp,
1573 void __user *newval, size_t newlen)
1574 {
1575 int op = 0, rc;
1576
1577 if (oldval)
1578 op |= 004;
1579 if (newval)
1580 op |= 002;
1581 if (sysctl_perm(table, op))
1582 return -EPERM;
1583
1584 if (table->strategy) {
1585 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1586 newval, newlen);
1587 if (rc < 0)
1588 return rc;
1589 if (rc > 0)
1590 return 0;
1591 }
1592
1593 /* If there is no strategy routine, or if the strategy returns
1594 * zero, proceed with automatic r/w */
1595 if (table->data && table->maxlen) {
1596 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1597 newval, newlen);
1598 if (rc < 0)
1599 return rc;
1600 }
1601 return 0;
1602 }
1603 #endif /* CONFIG_SYSCTL_SYSCALL */
1604
1605 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1606 {
1607 for (; table->ctl_name || table->procname; table++) {
1608 table->parent = parent;
1609 if (table->child)
1610 sysctl_set_parent(table, table->child);
1611 }
1612 }
1613
1614 static __init int sysctl_init(void)
1615 {
1616 int err;
1617 sysctl_set_parent(NULL, root_table);
1618 err = sysctl_check_table(current->nsproxy, root_table);
1619 return 0;
1620 }
1621
1622 core_initcall(sysctl_init);
1623
1624 /**
1625 * __register_sysctl_paths - register a sysctl hierarchy
1626 * @root: List of sysctl headers to register on
1627 * @namespaces: Data to compute which lists of sysctl entries are visible
1628 * @path: The path to the directory the sysctl table is in.
1629 * @table: the top-level table structure
1630 *
1631 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1632 * array. A completely 0 filled entry terminates the table.
1633 *
1634 * The members of the &struct ctl_table structure are used as follows:
1635 *
1636 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1637 * must be unique within that level of sysctl
1638 *
1639 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1640 * enter a sysctl file
1641 *
1642 * data - a pointer to data for use by proc_handler
1643 *
1644 * maxlen - the maximum size in bytes of the data
1645 *
1646 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1647 *
1648 * child - a pointer to the child sysctl table if this entry is a directory, or
1649 * %NULL.
1650 *
1651 * proc_handler - the text handler routine (described below)
1652 *
1653 * strategy - the strategy routine (described below)
1654 *
1655 * de - for internal use by the sysctl routines
1656 *
1657 * extra1, extra2 - extra pointers usable by the proc handler routines
1658 *
1659 * Leaf nodes in the sysctl tree will be represented by a single file
1660 * under /proc; non-leaf nodes will be represented by directories.
1661 *
1662 * sysctl(2) can automatically manage read and write requests through
1663 * the sysctl table. The data and maxlen fields of the ctl_table
1664 * struct enable minimal validation of the values being written to be
1665 * performed, and the mode field allows minimal authentication.
1666 *
1667 * More sophisticated management can be enabled by the provision of a
1668 * strategy routine with the table entry. This will be called before
1669 * any automatic read or write of the data is performed.
1670 *
1671 * The strategy routine may return
1672 *
1673 * < 0 - Error occurred (error is passed to user process)
1674 *
1675 * 0 - OK - proceed with automatic read or write.
1676 *
1677 * > 0 - OK - read or write has been done by the strategy routine, so
1678 * return immediately.
1679 *
1680 * There must be a proc_handler routine for any terminal nodes
1681 * mirrored under /proc/sys (non-terminals are handled by a built-in
1682 * directory handler). Several default handlers are available to
1683 * cover common cases -
1684 *
1685 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1686 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1687 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1688 *
1689 * It is the handler's job to read the input buffer from user memory
1690 * and process it. The handler should return 0 on success.
1691 *
1692 * This routine returns %NULL on a failure to register, and a pointer
1693 * to the table header on success.
1694 */
1695 struct ctl_table_header *__register_sysctl_paths(
1696 struct ctl_table_root *root,
1697 struct nsproxy *namespaces,
1698 const struct ctl_path *path, struct ctl_table *table)
1699 {
1700 struct list_head *header_list;
1701 struct ctl_table_header *header;
1702 struct ctl_table *new, **prevp;
1703 unsigned int n, npath;
1704
1705 /* Count the path components */
1706 for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1707 ;
1708
1709 /*
1710 * For each path component, allocate a 2-element ctl_table array.
1711 * The first array element will be filled with the sysctl entry
1712 * for this, the second will be the sentinel (ctl_name == 0).
1713 *
1714 * We allocate everything in one go so that we don't have to
1715 * worry about freeing additional memory in unregister_sysctl_table.
1716 */
1717 header = kzalloc(sizeof(struct ctl_table_header) +
1718 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1719 if (!header)
1720 return NULL;
1721
1722 new = (struct ctl_table *) (header + 1);
1723
1724 /* Now connect the dots */
1725 prevp = &header->ctl_table;
1726 for (n = 0; n < npath; ++n, ++path) {
1727 /* Copy the procname */
1728 new->procname = path->procname;
1729 new->ctl_name = path->ctl_name;
1730 new->mode = 0555;
1731
1732 *prevp = new;
1733 prevp = &new->child;
1734
1735 new += 2;
1736 }
1737 *prevp = table;
1738 header->ctl_table_arg = table;
1739
1740 INIT_LIST_HEAD(&header->ctl_entry);
1741 header->used = 0;
1742 header->unregistering = NULL;
1743 header->root = root;
1744 sysctl_set_parent(NULL, header->ctl_table);
1745 if (sysctl_check_table(namespaces, header->ctl_table)) {
1746 kfree(header);
1747 return NULL;
1748 }
1749 spin_lock(&sysctl_lock);
1750 header_list = lookup_header_list(root, namespaces);
1751 list_add_tail(&header->ctl_entry, header_list);
1752 spin_unlock(&sysctl_lock);
1753
1754 return header;
1755 }
1756
1757 /**
1758 * register_sysctl_table_path - register a sysctl table hierarchy
1759 * @path: The path to the directory the sysctl table is in.
1760 * @table: the top-level table structure
1761 *
1762 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1763 * array. A completely 0 filled entry terminates the table.
1764 *
1765 * See __register_sysctl_paths for more details.
1766 */
1767 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1768 struct ctl_table *table)
1769 {
1770 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1771 path, table);
1772 }
1773
1774 /**
1775 * register_sysctl_table - register a sysctl table hierarchy
1776 * @table: the top-level table structure
1777 *
1778 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1779 * array. A completely 0 filled entry terminates the table.
1780 *
1781 * See register_sysctl_paths for more details.
1782 */
1783 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1784 {
1785 static const struct ctl_path null_path[] = { {} };
1786
1787 return register_sysctl_paths(null_path, table);
1788 }
1789
1790 /**
1791 * unregister_sysctl_table - unregister a sysctl table hierarchy
1792 * @header: the header returned from register_sysctl_table
1793 *
1794 * Unregisters the sysctl table and all children. proc entries may not
1795 * actually be removed until they are no longer used by anyone.
1796 */
1797 void unregister_sysctl_table(struct ctl_table_header * header)
1798 {
1799 might_sleep();
1800
1801 if (header == NULL)
1802 return;
1803
1804 spin_lock(&sysctl_lock);
1805 start_unregistering(header);
1806 spin_unlock(&sysctl_lock);
1807 kfree(header);
1808 }
1809
1810 #else /* !CONFIG_SYSCTL */
1811 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1812 {
1813 return NULL;
1814 }
1815
1816 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1817 struct ctl_table *table)
1818 {
1819 return NULL;
1820 }
1821
1822 void unregister_sysctl_table(struct ctl_table_header * table)
1823 {
1824 }
1825
1826 #endif /* CONFIG_SYSCTL */
1827
1828 /*
1829 * /proc/sys support
1830 */
1831
1832 #ifdef CONFIG_PROC_SYSCTL
1833
1834 static int _proc_do_string(void* data, int maxlen, int write,
1835 struct file *filp, void __user *buffer,
1836 size_t *lenp, loff_t *ppos)
1837 {
1838 size_t len;
1839 char __user *p;
1840 char c;
1841
1842 if (!data || !maxlen || !*lenp) {
1843 *lenp = 0;
1844 return 0;
1845 }
1846
1847 if (write) {
1848 len = 0;
1849 p = buffer;
1850 while (len < *lenp) {
1851 if (get_user(c, p++))
1852 return -EFAULT;
1853 if (c == 0 || c == '\n')
1854 break;
1855 len++;
1856 }
1857 if (len >= maxlen)
1858 len = maxlen-1;
1859 if(copy_from_user(data, buffer, len))
1860 return -EFAULT;
1861 ((char *) data)[len] = 0;
1862 *ppos += *lenp;
1863 } else {
1864 len = strlen(data);
1865 if (len > maxlen)
1866 len = maxlen;
1867
1868 if (*ppos > len) {
1869 *lenp = 0;
1870 return 0;
1871 }
1872
1873 data += *ppos;
1874 len -= *ppos;
1875
1876 if (len > *lenp)
1877 len = *lenp;
1878 if (len)
1879 if(copy_to_user(buffer, data, len))
1880 return -EFAULT;
1881 if (len < *lenp) {
1882 if(put_user('\n', ((char __user *) buffer) + len))
1883 return -EFAULT;
1884 len++;
1885 }
1886 *lenp = len;
1887 *ppos += len;
1888 }
1889 return 0;
1890 }
1891
1892 /**
1893 * proc_dostring - read a string sysctl
1894 * @table: the sysctl table
1895 * @write: %TRUE if this is a write to the sysctl file
1896 * @filp: the file structure
1897 * @buffer: the user buffer
1898 * @lenp: the size of the user buffer
1899 * @ppos: file position
1900 *
1901 * Reads/writes a string from/to the user buffer. If the kernel
1902 * buffer provided is not large enough to hold the string, the
1903 * string is truncated. The copied string is %NULL-terminated.
1904 * If the string is being read by the user process, it is copied
1905 * and a newline '\n' is added. It is truncated if the buffer is
1906 * not large enough.
1907 *
1908 * Returns 0 on success.
1909 */
1910 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1911 void __user *buffer, size_t *lenp, loff_t *ppos)
1912 {
1913 return _proc_do_string(table->data, table->maxlen, write, filp,
1914 buffer, lenp, ppos);
1915 }
1916
1917
1918 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1919 int *valp,
1920 int write, void *data)
1921 {
1922 if (write) {
1923 *valp = *negp ? -*lvalp : *lvalp;
1924 } else {
1925 int val = *valp;
1926 if (val < 0) {
1927 *negp = -1;
1928 *lvalp = (unsigned long)-val;
1929 } else {
1930 *negp = 0;
1931 *lvalp = (unsigned long)val;
1932 }
1933 }
1934 return 0;
1935 }
1936
1937 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1938 int write, struct file *filp, void __user *buffer,
1939 size_t *lenp, loff_t *ppos,
1940 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1941 int write, void *data),
1942 void *data)
1943 {
1944 #define TMPBUFLEN 21
1945 int *i, vleft, first=1, neg, val;
1946 unsigned long lval;
1947 size_t left, len;
1948
1949 char buf[TMPBUFLEN], *p;
1950 char __user *s = buffer;
1951
1952 if (!tbl_data || !table->maxlen || !*lenp ||
1953 (*ppos && !write)) {
1954 *lenp = 0;
1955 return 0;
1956 }
1957
1958 i = (int *) tbl_data;
1959 vleft = table->maxlen / sizeof(*i);
1960 left = *lenp;
1961
1962 if (!conv)
1963 conv = do_proc_dointvec_conv;
1964
1965 for (; left && vleft--; i++, first=0) {
1966 if (write) {
1967 while (left) {
1968 char c;
1969 if (get_user(c, s))
1970 return -EFAULT;
1971 if (!isspace(c))
1972 break;
1973 left--;
1974 s++;
1975 }
1976 if (!left)
1977 break;
1978 neg = 0;
1979 len = left;
1980 if (len > sizeof(buf) - 1)
1981 len = sizeof(buf) - 1;
1982 if (copy_from_user(buf, s, len))
1983 return -EFAULT;
1984 buf[len] = 0;
1985 p = buf;
1986 if (*p == '-' && left > 1) {
1987 neg = 1;
1988 p++;
1989 }
1990 if (*p < '0' || *p > '9')
1991 break;
1992
1993 lval = simple_strtoul(p, &p, 0);
1994
1995 len = p-buf;
1996 if ((len < left) && *p && !isspace(*p))
1997 break;
1998 if (neg)
1999 val = -val;
2000 s += len;
2001 left -= len;
2002
2003 if (conv(&neg, &lval, i, 1, data))
2004 break;
2005 } else {
2006 p = buf;
2007 if (!first)
2008 *p++ = '\t';
2009
2010 if (conv(&neg, &lval, i, 0, data))
2011 break;
2012
2013 sprintf(p, "%s%lu", neg ? "-" : "", lval);
2014 len = strlen(buf);
2015 if (len > left)
2016 len = left;
2017 if(copy_to_user(s, buf, len))
2018 return -EFAULT;
2019 left -= len;
2020 s += len;
2021 }
2022 }
2023
2024 if (!write && !first && left) {
2025 if(put_user('\n', s))
2026 return -EFAULT;
2027 left--, s++;
2028 }
2029 if (write) {
2030 while (left) {
2031 char c;
2032 if (get_user(c, s++))
2033 return -EFAULT;
2034 if (!isspace(c))
2035 break;
2036 left--;
2037 }
2038 }
2039 if (write && first)
2040 return -EINVAL;
2041 *lenp -= left;
2042 *ppos += *lenp;
2043 return 0;
2044 #undef TMPBUFLEN
2045 }
2046
2047 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2048 void __user *buffer, size_t *lenp, loff_t *ppos,
2049 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2050 int write, void *data),
2051 void *data)
2052 {
2053 return __do_proc_dointvec(table->data, table, write, filp,
2054 buffer, lenp, ppos, conv, data);
2055 }
2056
2057 /**
2058 * proc_dointvec - read a vector of integers
2059 * @table: the sysctl table
2060 * @write: %TRUE if this is a write to the sysctl file
2061 * @filp: the file structure
2062 * @buffer: the user buffer
2063 * @lenp: the size of the user buffer
2064 * @ppos: file position
2065 *
2066 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2067 * values from/to the user buffer, treated as an ASCII string.
2068 *
2069 * Returns 0 on success.
2070 */
2071 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2072 void __user *buffer, size_t *lenp, loff_t *ppos)
2073 {
2074 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2075 NULL,NULL);
2076 }
2077
2078 #define OP_SET 0
2079 #define OP_AND 1
2080 #define OP_OR 2
2081
2082 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2083 int *valp,
2084 int write, void *data)
2085 {
2086 int op = *(int *)data;
2087 if (write) {
2088 int val = *negp ? -*lvalp : *lvalp;
2089 switch(op) {
2090 case OP_SET: *valp = val; break;
2091 case OP_AND: *valp &= val; break;
2092 case OP_OR: *valp |= val; break;
2093 }
2094 } else {
2095 int val = *valp;
2096 if (val < 0) {
2097 *negp = -1;
2098 *lvalp = (unsigned long)-val;
2099 } else {
2100 *negp = 0;
2101 *lvalp = (unsigned long)val;
2102 }
2103 }
2104 return 0;
2105 }
2106
2107 /*
2108 * Taint values can only be increased
2109 */
2110 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2111 void __user *buffer, size_t *lenp, loff_t *ppos)
2112 {
2113 int op;
2114
2115 if (write && !capable(CAP_SYS_ADMIN))
2116 return -EPERM;
2117
2118 op = OP_OR;
2119 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2120 do_proc_dointvec_bset_conv,&op);
2121 }
2122
2123 struct do_proc_dointvec_minmax_conv_param {
2124 int *min;
2125 int *max;
2126 };
2127
2128 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
2129 int *valp,
2130 int write, void *data)
2131 {
2132 struct do_proc_dointvec_minmax_conv_param *param = data;
2133 if (write) {
2134 int val = *negp ? -*lvalp : *lvalp;
2135 if ((param->min && *param->min > val) ||
2136 (param->max && *param->max < val))
2137 return -EINVAL;
2138 *valp = val;
2139 } else {
2140 int val = *valp;
2141 if (val < 0) {
2142 *negp = -1;
2143 *lvalp = (unsigned long)-val;
2144 } else {
2145 *negp = 0;
2146 *lvalp = (unsigned long)val;
2147 }
2148 }
2149 return 0;
2150 }
2151
2152 /**
2153 * proc_dointvec_minmax - read a vector of integers with min/max values
2154 * @table: the sysctl table
2155 * @write: %TRUE if this is a write to the sysctl file
2156 * @filp: the file structure
2157 * @buffer: the user buffer
2158 * @lenp: the size of the user buffer
2159 * @ppos: file position
2160 *
2161 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2162 * values from/to the user buffer, treated as an ASCII string.
2163 *
2164 * This routine will ensure the values are within the range specified by
2165 * table->extra1 (min) and table->extra2 (max).
2166 *
2167 * Returns 0 on success.
2168 */
2169 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2170 void __user *buffer, size_t *lenp, loff_t *ppos)
2171 {
2172 struct do_proc_dointvec_minmax_conv_param param = {
2173 .min = (int *) table->extra1,
2174 .max = (int *) table->extra2,
2175 };
2176 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2177 do_proc_dointvec_minmax_conv, &param);
2178 }
2179
2180 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2181 struct file *filp,
2182 void __user *buffer,
2183 size_t *lenp, loff_t *ppos,
2184 unsigned long convmul,
2185 unsigned long convdiv)
2186 {
2187 #define TMPBUFLEN 21
2188 unsigned long *i, *min, *max, val;
2189 int vleft, first=1, neg;
2190 size_t len, left;
2191 char buf[TMPBUFLEN], *p;
2192 char __user *s = buffer;
2193
2194 if (!data || !table->maxlen || !*lenp ||
2195 (*ppos && !write)) {
2196 *lenp = 0;
2197 return 0;
2198 }
2199
2200 i = (unsigned long *) data;
2201 min = (unsigned long *) table->extra1;
2202 max = (unsigned long *) table->extra2;
2203 vleft = table->maxlen / sizeof(unsigned long);
2204 left = *lenp;
2205
2206 for (; left && vleft--; i++, min++, max++, first=0) {
2207 if (write) {
2208 while (left) {
2209 char c;
2210 if (get_user(c, s))
2211 return -EFAULT;
2212 if (!isspace(c))
2213 break;
2214 left--;
2215 s++;
2216 }
2217 if (!left)
2218 break;
2219 neg = 0;
2220 len = left;
2221 if (len > TMPBUFLEN-1)
2222 len = TMPBUFLEN-1;
2223 if (copy_from_user(buf, s, len))
2224 return -EFAULT;
2225 buf[len] = 0;
2226 p = buf;
2227 if (*p == '-' && left > 1) {
2228 neg = 1;
2229 p++;
2230 }
2231 if (*p < '0' || *p > '9')
2232 break;
2233 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2234 len = p-buf;
2235 if ((len < left) && *p && !isspace(*p))
2236 break;
2237 if (neg)
2238 val = -val;
2239 s += len;
2240 left -= len;
2241
2242 if(neg)
2243 continue;
2244 if ((min && val < *min) || (max && val > *max))
2245 continue;
2246 *i = val;
2247 } else {
2248 p = buf;
2249 if (!first)
2250 *p++ = '\t';
2251 sprintf(p, "%lu", convdiv * (*i) / convmul);
2252 len = strlen(buf);
2253 if (len > left)
2254 len = left;
2255 if(copy_to_user(s, buf, len))
2256 return -EFAULT;
2257 left -= len;
2258 s += len;
2259 }
2260 }
2261
2262 if (!write && !first && left) {
2263 if(put_user('\n', s))
2264 return -EFAULT;
2265 left--, s++;
2266 }
2267 if (write) {
2268 while (left) {
2269 char c;
2270 if (get_user(c, s++))
2271 return -EFAULT;
2272 if (!isspace(c))
2273 break;
2274 left--;
2275 }
2276 }
2277 if (write && first)
2278 return -EINVAL;
2279 *lenp -= left;
2280 *ppos += *lenp;
2281 return 0;
2282 #undef TMPBUFLEN
2283 }
2284
2285 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2286 struct file *filp,
2287 void __user *buffer,
2288 size_t *lenp, loff_t *ppos,
2289 unsigned long convmul,
2290 unsigned long convdiv)
2291 {
2292 return __do_proc_doulongvec_minmax(table->data, table, write,
2293 filp, buffer, lenp, ppos, convmul, convdiv);
2294 }
2295
2296 /**
2297 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2298 * @table: the sysctl table
2299 * @write: %TRUE if this is a write to the sysctl file
2300 * @filp: the file structure
2301 * @buffer: the user buffer
2302 * @lenp: the size of the user buffer
2303 * @ppos: file position
2304 *
2305 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2306 * values from/to the user buffer, treated as an ASCII string.
2307 *
2308 * This routine will ensure the values are within the range specified by
2309 * table->extra1 (min) and table->extra2 (max).
2310 *
2311 * Returns 0 on success.
2312 */
2313 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2314 void __user *buffer, size_t *lenp, loff_t *ppos)
2315 {
2316 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2317 }
2318
2319 /**
2320 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2321 * @table: the sysctl table
2322 * @write: %TRUE if this is a write to the sysctl file
2323 * @filp: the file structure
2324 * @buffer: the user buffer
2325 * @lenp: the size of the user buffer
2326 * @ppos: file position
2327 *
2328 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2329 * values from/to the user buffer, treated as an ASCII string. The values
2330 * are treated as milliseconds, and converted to jiffies when they are stored.
2331 *
2332 * This routine will ensure the values are within the range specified by
2333 * table->extra1 (min) and table->extra2 (max).
2334 *
2335 * Returns 0 on success.
2336 */
2337 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2338 struct file *filp,
2339 void __user *buffer,
2340 size_t *lenp, loff_t *ppos)
2341 {
2342 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2343 lenp, ppos, HZ, 1000l);
2344 }
2345
2346
2347 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2348 int *valp,
2349 int write, void *data)
2350 {
2351 if (write) {
2352 if (*lvalp > LONG_MAX / HZ)
2353 return 1;
2354 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2355 } else {
2356 int val = *valp;
2357 unsigned long lval;
2358 if (val < 0) {
2359 *negp = -1;
2360 lval = (unsigned long)-val;
2361 } else {
2362 *negp = 0;
2363 lval = (unsigned long)val;
2364 }
2365 *lvalp = lval / HZ;
2366 }
2367 return 0;
2368 }
2369
2370 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2371 int *valp,
2372 int write, void *data)
2373 {
2374 if (write) {
2375 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2376 return 1;
2377 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2378 } else {
2379 int val = *valp;
2380 unsigned long lval;
2381 if (val < 0) {
2382 *negp = -1;
2383 lval = (unsigned long)-val;
2384 } else {
2385 *negp = 0;
2386 lval = (unsigned long)val;
2387 }
2388 *lvalp = jiffies_to_clock_t(lval);
2389 }
2390 return 0;
2391 }
2392
2393 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2394 int *valp,
2395 int write, void *data)
2396 {
2397 if (write) {
2398 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2399 } else {
2400 int val = *valp;
2401 unsigned long lval;
2402 if (val < 0) {
2403 *negp = -1;
2404 lval = (unsigned long)-val;
2405 } else {
2406 *negp = 0;
2407 lval = (unsigned long)val;
2408 }
2409 *lvalp = jiffies_to_msecs(lval);
2410 }
2411 return 0;
2412 }
2413
2414 /**
2415 * proc_dointvec_jiffies - read a vector of integers as seconds
2416 * @table: the sysctl table
2417 * @write: %TRUE if this is a write to the sysctl file
2418 * @filp: the file structure
2419 * @buffer: the user buffer
2420 * @lenp: the size of the user buffer
2421 * @ppos: file position
2422 *
2423 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2424 * values from/to the user buffer, treated as an ASCII string.
2425 * The values read are assumed to be in seconds, and are converted into
2426 * jiffies.
2427 *
2428 * Returns 0 on success.
2429 */
2430 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2431 void __user *buffer, size_t *lenp, loff_t *ppos)
2432 {
2433 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2434 do_proc_dointvec_jiffies_conv,NULL);
2435 }
2436
2437 /**
2438 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2439 * @table: the sysctl table
2440 * @write: %TRUE if this is a write to the sysctl file
2441 * @filp: the file structure
2442 * @buffer: the user buffer
2443 * @lenp: the size of the user buffer
2444 * @ppos: pointer to the file position
2445 *
2446 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2447 * values from/to the user buffer, treated as an ASCII string.
2448 * The values read are assumed to be in 1/USER_HZ seconds, and
2449 * are converted into jiffies.
2450 *
2451 * Returns 0 on success.
2452 */
2453 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2454 void __user *buffer, size_t *lenp, loff_t *ppos)
2455 {
2456 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2457 do_proc_dointvec_userhz_jiffies_conv,NULL);
2458 }
2459
2460 /**
2461 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2462 * @table: the sysctl table
2463 * @write: %TRUE if this is a write to the sysctl file
2464 * @filp: the file structure
2465 * @buffer: the user buffer
2466 * @lenp: the size of the user buffer
2467 * @ppos: file position
2468 * @ppos: the current position in the file
2469 *
2470 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2471 * values from/to the user buffer, treated as an ASCII string.
2472 * The values read are assumed to be in 1/1000 seconds, and
2473 * are converted into jiffies.
2474 *
2475 * Returns 0 on success.
2476 */
2477 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2478 void __user *buffer, size_t *lenp, loff_t *ppos)
2479 {
2480 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2481 do_proc_dointvec_ms_jiffies_conv, NULL);
2482 }
2483
2484 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2485 void __user *buffer, size_t *lenp, loff_t *ppos)
2486 {
2487 struct pid *new_pid;
2488 pid_t tmp;
2489 int r;
2490
2491 tmp = pid_nr_ns(cad_pid, current->nsproxy->pid_ns);
2492
2493 r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2494 lenp, ppos, NULL, NULL);
2495 if (r || !write)
2496 return r;
2497
2498 new_pid = find_get_pid(tmp);
2499 if (!new_pid)
2500 return -ESRCH;
2501
2502 put_pid(xchg(&cad_pid, new_pid));
2503 return 0;
2504 }
2505
2506 #else /* CONFIG_PROC_FS */
2507
2508 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2509 void __user *buffer, size_t *lenp, loff_t *ppos)
2510 {
2511 return -ENOSYS;
2512 }
2513
2514 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2515 void __user *buffer, size_t *lenp, loff_t *ppos)
2516 {
2517 return -ENOSYS;
2518 }
2519
2520 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2521 void __user *buffer, size_t *lenp, loff_t *ppos)
2522 {
2523 return -ENOSYS;
2524 }
2525
2526 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2527 void __user *buffer, size_t *lenp, loff_t *ppos)
2528 {
2529 return -ENOSYS;
2530 }
2531
2532 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2533 void __user *buffer, size_t *lenp, loff_t *ppos)
2534 {
2535 return -ENOSYS;
2536 }
2537
2538 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2539 void __user *buffer, size_t *lenp, loff_t *ppos)
2540 {
2541 return -ENOSYS;
2542 }
2543
2544 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2545 void __user *buffer, size_t *lenp, loff_t *ppos)
2546 {
2547 return -ENOSYS;
2548 }
2549
2550 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2551 struct file *filp,
2552 void __user *buffer,
2553 size_t *lenp, loff_t *ppos)
2554 {
2555 return -ENOSYS;
2556 }
2557
2558
2559 #endif /* CONFIG_PROC_FS */
2560
2561
2562 #ifdef CONFIG_SYSCTL_SYSCALL
2563 /*
2564 * General sysctl support routines
2565 */
2566
2567 /* The generic sysctl data routine (used if no strategy routine supplied) */
2568 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2569 void __user *oldval, size_t __user *oldlenp,
2570 void __user *newval, size_t newlen)
2571 {
2572 size_t len;
2573
2574 /* Get out of I don't have a variable */
2575 if (!table->data || !table->maxlen)
2576 return -ENOTDIR;
2577
2578 if (oldval && oldlenp) {
2579 if (get_user(len, oldlenp))
2580 return -EFAULT;
2581 if (len) {
2582 if (len > table->maxlen)
2583 len = table->maxlen;
2584 if (copy_to_user(oldval, table->data, len))
2585 return -EFAULT;
2586 if (put_user(len, oldlenp))
2587 return -EFAULT;
2588 }
2589 }
2590
2591 if (newval && newlen) {
2592 if (newlen > table->maxlen)
2593 newlen = table->maxlen;
2594
2595 if (copy_from_user(table->data, newval, newlen))
2596 return -EFAULT;
2597 }
2598 return 1;
2599 }
2600
2601 /* The generic string strategy routine: */
2602 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2603 void __user *oldval, size_t __user *oldlenp,
2604 void __user *newval, size_t newlen)
2605 {
2606 if (!table->data || !table->maxlen)
2607 return -ENOTDIR;
2608
2609 if (oldval && oldlenp) {
2610 size_t bufsize;
2611 if (get_user(bufsize, oldlenp))
2612 return -EFAULT;
2613 if (bufsize) {
2614 size_t len = strlen(table->data), copied;
2615
2616 /* This shouldn't trigger for a well-formed sysctl */
2617 if (len > table->maxlen)
2618 len = table->maxlen;
2619
2620 /* Copy up to a max of bufsize-1 bytes of the string */
2621 copied = (len >= bufsize) ? bufsize - 1 : len;
2622
2623 if (copy_to_user(oldval, table->data, copied) ||
2624 put_user(0, (char __user *)(oldval + copied)))
2625 return -EFAULT;
2626 if (put_user(len, oldlenp))
2627 return -EFAULT;
2628 }
2629 }
2630 if (newval && newlen) {
2631 size_t len = newlen;
2632 if (len > table->maxlen)
2633 len = table->maxlen;
2634 if(copy_from_user(table->data, newval, len))
2635 return -EFAULT;
2636 if (len == table->maxlen)
2637 len--;
2638 ((char *) table->data)[len] = 0;
2639 }
2640 return 1;
2641 }
2642
2643 /*
2644 * This function makes sure that all of the integers in the vector
2645 * are between the minimum and maximum values given in the arrays
2646 * table->extra1 and table->extra2, respectively.
2647 */
2648 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2649 void __user *oldval, size_t __user *oldlenp,
2650 void __user *newval, size_t newlen)
2651 {
2652
2653 if (newval && newlen) {
2654 int __user *vec = (int __user *) newval;
2655 int *min = (int *) table->extra1;
2656 int *max = (int *) table->extra2;
2657 size_t length;
2658 int i;
2659
2660 if (newlen % sizeof(int) != 0)
2661 return -EINVAL;
2662
2663 if (!table->extra1 && !table->extra2)
2664 return 0;
2665
2666 if (newlen > table->maxlen)
2667 newlen = table->maxlen;
2668 length = newlen / sizeof(int);
2669
2670 for (i = 0; i < length; i++) {
2671 int value;
2672 if (get_user(value, vec + i))
2673 return -EFAULT;
2674 if (min && value < min[i])
2675 return -EINVAL;
2676 if (max && value > max[i])
2677 return -EINVAL;
2678 }
2679 }
2680 return 0;
2681 }
2682
2683 /* Strategy function to convert jiffies to seconds */
2684 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2685 void __user *oldval, size_t __user *oldlenp,
2686 void __user *newval, size_t newlen)
2687 {
2688 if (oldval && oldlenp) {
2689 size_t olen;
2690
2691 if (get_user(olen, oldlenp))
2692 return -EFAULT;
2693 if (olen) {
2694 int val;
2695
2696 if (olen < sizeof(int))
2697 return -EINVAL;
2698
2699 val = *(int *)(table->data) / HZ;
2700 if (put_user(val, (int __user *)oldval))
2701 return -EFAULT;
2702 if (put_user(sizeof(int), oldlenp))
2703 return -EFAULT;
2704 }
2705 }
2706 if (newval && newlen) {
2707 int new;
2708 if (newlen != sizeof(int))
2709 return -EINVAL;
2710 if (get_user(new, (int __user *)newval))
2711 return -EFAULT;
2712 *(int *)(table->data) = new*HZ;
2713 }
2714 return 1;
2715 }
2716
2717 /* Strategy function to convert jiffies to seconds */
2718 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2719 void __user *oldval, size_t __user *oldlenp,
2720 void __user *newval, size_t newlen)
2721 {
2722 if (oldval && oldlenp) {
2723 size_t olen;
2724
2725 if (get_user(olen, oldlenp))
2726 return -EFAULT;
2727 if (olen) {
2728 int val;
2729
2730 if (olen < sizeof(int))
2731 return -EINVAL;
2732
2733 val = jiffies_to_msecs(*(int *)(table->data));
2734 if (put_user(val, (int __user *)oldval))
2735 return -EFAULT;
2736 if (put_user(sizeof(int), oldlenp))
2737 return -EFAULT;
2738 }
2739 }
2740 if (newval && newlen) {
2741 int new;
2742 if (newlen != sizeof(int))
2743 return -EINVAL;
2744 if (get_user(new, (int __user *)newval))
2745 return -EFAULT;
2746 *(int *)(table->data) = msecs_to_jiffies(new);
2747 }
2748 return 1;
2749 }
2750
2751
2752
2753 #else /* CONFIG_SYSCTL_SYSCALL */
2754
2755
2756 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2757 {
2758 struct __sysctl_args tmp;
2759 int error;
2760
2761 if (copy_from_user(&tmp, args, sizeof(tmp)))
2762 return -EFAULT;
2763
2764 error = deprecated_sysctl_warning(&tmp);
2765
2766 /* If no error reading the parameters then just -ENOSYS ... */
2767 if (!error)
2768 error = -ENOSYS;
2769
2770 return error;
2771 }
2772
2773 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2774 void __user *oldval, size_t __user *oldlenp,
2775 void __user *newval, size_t newlen)
2776 {
2777 return -ENOSYS;
2778 }
2779
2780 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2781 void __user *oldval, size_t __user *oldlenp,
2782 void __user *newval, size_t newlen)
2783 {
2784 return -ENOSYS;
2785 }
2786
2787 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2788 void __user *oldval, size_t __user *oldlenp,
2789 void __user *newval, size_t newlen)
2790 {
2791 return -ENOSYS;
2792 }
2793
2794 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2795 void __user *oldval, size_t __user *oldlenp,
2796 void __user *newval, size_t newlen)
2797 {
2798 return -ENOSYS;
2799 }
2800
2801 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2802 void __user *oldval, size_t __user *oldlenp,
2803 void __user *newval, size_t newlen)
2804 {
2805 return -ENOSYS;
2806 }
2807
2808 #endif /* CONFIG_SYSCTL_SYSCALL */
2809
2810 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2811 {
2812 static int msg_count;
2813 int name[CTL_MAXNAME];
2814 int i;
2815
2816 /* Check args->nlen. */
2817 if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2818 return -ENOTDIR;
2819
2820 /* Read in the sysctl name for better debug message logging */
2821 for (i = 0; i < args->nlen; i++)
2822 if (get_user(name[i], args->name + i))
2823 return -EFAULT;
2824
2825 /* Ignore accesses to kernel.version */
2826 if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2827 return 0;
2828
2829 if (msg_count < 5) {
2830 msg_count++;
2831 printk(KERN_INFO
2832 "warning: process `%s' used the deprecated sysctl "
2833 "system call with ", current->comm);
2834 for (i = 0; i < args->nlen; i++)
2835 printk("%d.", name[i]);
2836 printk("\n");
2837 }
2838 return 0;
2839 }
2840
2841 /*
2842 * No sense putting this after each symbol definition, twice,
2843 * exception granted :-)
2844 */
2845 EXPORT_SYMBOL(proc_dointvec);
2846 EXPORT_SYMBOL(proc_dointvec_jiffies);
2847 EXPORT_SYMBOL(proc_dointvec_minmax);
2848 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2849 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2850 EXPORT_SYMBOL(proc_dostring);
2851 EXPORT_SYMBOL(proc_doulongvec_minmax);
2852 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2853 EXPORT_SYMBOL(register_sysctl_table);
2854 EXPORT_SYMBOL(register_sysctl_paths);
2855 EXPORT_SYMBOL(sysctl_intvec);
2856 EXPORT_SYMBOL(sysctl_jiffies);
2857 EXPORT_SYMBOL(sysctl_ms_jiffies);
2858 EXPORT_SYMBOL(sysctl_string);
2859 EXPORT_SYMBOL(sysctl_data);
2860 EXPORT_SYMBOL(unregister_sysctl_table);
WRT350N Kernel Patches