?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Staging: hv: hv_mouse: fix up guid variable name
[wandboard.git] / kernel / sysctl.c
blob0f1bd83db98523333b9fabde37d200512b20b77e
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/signal.h>
27 #include <linux/printk.h>
28 #include <linux/proc_fs.h>
29 #include <linux/security.h>
30 #include <linux/ctype.h>
31 #include <linux/kmemcheck.h>
32 #include <linux/fs.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/ratelimit.h>
41 #include <linux/compaction.h>
42 #include <linux/hugetlb.h>
43 #include <linux/initrd.h>
44 #include <linux/key.h>
45 #include <linux/times.h>
46 #include <linux/limits.h>
47 #include <linux/dcache.h>
48 #include <linux/dnotify.h>
49 #include <linux/syscalls.h>
50 #include <linux/vmstat.h>
51 #include <linux/nfs_fs.h>
52 #include <linux/acpi.h>
53 #include <linux/reboot.h>
54 #include <linux/ftrace.h>
55 #include <linux/perf_event.h>
56 #include <linux/kprobes.h>
57 #include <linux/pipe_fs_i.h>
58 #include <linux/oom.h>
59
60 #include <asm/uaccess.h>
61 #include <asm/processor.h>
62
63 #ifdef CONFIG_X86
64 #include <asm/nmi.h>
65 #include <asm/stacktrace.h>
66 #include <asm/io.h>
67 #endif
68 #ifdef CONFIG_BSD_PROCESS_ACCT
69 #include <linux/acct.h>
70 #endif
71 #ifdef CONFIG_RT_MUTEXES
72 #include <linux/rtmutex.h>
73 #endif
74 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
75 #include <linux/lockdep.h>
76 #endif
77 #ifdef CONFIG_CHR_DEV_SG
78 #include <scsi/sg.h>
79 #endif
80
81 #ifdef CONFIG_LOCKUP_DETECTOR
82 #include <linux/nmi.h>
83 #endif
84
85
86 #if defined(CONFIG_SYSCTL)
87
88 /* External variables not in a header file. */
89 extern int sysctl_overcommit_memory;
90 extern int sysctl_overcommit_ratio;
91 extern int max_threads;
92 extern int core_uses_pid;
93 extern int suid_dumpable;
94 extern char core_pattern[];
95 extern unsigned int core_pipe_limit;
96 extern int pid_max;
97 extern int min_free_kbytes;
98 extern int pid_max_min, pid_max_max;
99 extern int sysctl_drop_caches;
100 extern int percpu_pagelist_fraction;
101 extern int compat_log;
102 extern int latencytop_enabled;
103 extern int sysctl_nr_open_min, sysctl_nr_open_max;
104 #ifndef CONFIG_MMU
105 extern int sysctl_nr_trim_pages;
106 #endif
107 #ifdef CONFIG_BLOCK
108 extern int blk_iopoll_enabled;
109 #endif
110
111 /* Constants used for minimum and maximum */
112 #ifdef CONFIG_LOCKUP_DETECTOR
113 static int sixty = 60;
114 static int neg_one = -1;
115 #endif
116
117 static int zero;
118 static int __maybe_unused one = 1;
119 static int __maybe_unused two = 2;
120 static unsigned long one_ul = 1;
121 static int one_hundred = 100;
122 #ifdef CONFIG_PRINTK
123 static int ten_thousand = 10000;
124 #endif
125
126 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
127 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
128
129 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
130 static int maxolduid = 65535;
131 static int minolduid;
132 static int min_percpu_pagelist_fract = 8;
133
134 static int ngroups_max = NGROUPS_MAX;
135
136 #ifdef CONFIG_INOTIFY_USER
137 #include <linux/inotify.h>
138 #endif
139 #ifdef CONFIG_SPARC
140 #include <asm/system.h>
141 #endif
142
143 #ifdef CONFIG_SPARC64
144 extern int sysctl_tsb_ratio;
145 #endif
146
147 #ifdef __hppa__
148 extern int pwrsw_enabled;
149 extern int unaligned_enabled;
150 #endif
151
152 #ifdef CONFIG_S390
153 #ifdef CONFIG_MATHEMU
154 extern int sysctl_ieee_emulation_warnings;
155 #endif
156 extern int sysctl_userprocess_debug;
157 extern int spin_retry;
158 #endif
159
160 #ifdef CONFIG_IA64
161 extern int no_unaligned_warning;
162 extern int unaligned_dump_stack;
163 #endif
164
165 #ifdef CONFIG_PROC_SYSCTL
166 static int proc_do_cad_pid(struct ctl_table *table, int write,
167 void __user *buffer, size_t *lenp, loff_t *ppos);
168 static int proc_taint(struct ctl_table *table, int write,
169 void __user *buffer, size_t *lenp, loff_t *ppos);
170 #endif
171
172 #ifdef CONFIG_MAGIC_SYSRQ
173 /* Note: sysrq code uses it's own private copy */
174 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
175
176 static int sysrq_sysctl_handler(ctl_table *table, int write,
177 void __user *buffer, size_t *lenp,
178 loff_t *ppos)
179 {
180 int error;
181
182 error = proc_dointvec(table, write, buffer, lenp, ppos);
183 if (error)
184 return error;
185
186 if (write)
187 sysrq_toggle_support(__sysrq_enabled);
188
189 return 0;
190 }
191
192 #endif
193
194 static struct ctl_table root_table[];
195 static struct ctl_table_root sysctl_table_root;
196 static struct ctl_table_header root_table_header = {
197 .count = 1,
198 .ctl_table = root_table,
199 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
200 .root = &sysctl_table_root,
201 .set = &sysctl_table_root.default_set,
202 };
203 static struct ctl_table_root sysctl_table_root = {
204 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
205 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
206 };
207
208 static struct ctl_table kern_table[];
209 static struct ctl_table vm_table[];
210 static struct ctl_table fs_table[];
211 static struct ctl_table debug_table[];
212 static struct ctl_table dev_table[];
213 extern struct ctl_table random_table[];
214 #ifdef CONFIG_EPOLL
215 extern struct ctl_table epoll_table[];
216 #endif
217
218 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
219 int sysctl_legacy_va_layout;
220 #endif
221
222 /* The default sysctl tables: */
223
224 static struct ctl_table root_table[] = {
225 {
226 .procname = "kernel",
227 .mode = 0555,
228 .child = kern_table,
229 },
230 {
231 .procname = "vm",
232 .mode = 0555,
233 .child = vm_table,
234 },
235 {
236 .procname = "fs",
237 .mode = 0555,
238 .child = fs_table,
239 },
240 {
241 .procname = "debug",
242 .mode = 0555,
243 .child = debug_table,
244 },
245 {
246 .procname = "dev",
247 .mode = 0555,
248 .child = dev_table,
249 },
250 { }
251 };
252
253 #ifdef CONFIG_SCHED_DEBUG
254 static int min_sched_granularity_ns = 100000; /* 100 usecs */
255 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
256 static int min_wakeup_granularity_ns; /* 0 usecs */
257 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
258 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
259 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
260 #endif
261
262 #ifdef CONFIG_COMPACTION
263 static int min_extfrag_threshold;
264 static int max_extfrag_threshold = 1000;
265 #endif
266
267 static struct ctl_table kern_table[] = {
268 {
269 .procname = "sched_child_runs_first",
270 .data = &sysctl_sched_child_runs_first,
271 .maxlen = sizeof(unsigned int),
272 .mode = 0644,
273 .proc_handler = proc_dointvec,
274 },
275 #ifdef CONFIG_SCHED_DEBUG
276 {
277 .procname = "sched_min_granularity_ns",
278 .data = &sysctl_sched_min_granularity,
279 .maxlen = sizeof(unsigned int),
280 .mode = 0644,
281 .proc_handler = sched_proc_update_handler,
282 .extra1 = &min_sched_granularity_ns,
283 .extra2 = &max_sched_granularity_ns,
284 },
285 {
286 .procname = "sched_latency_ns",
287 .data = &sysctl_sched_latency,
288 .maxlen = sizeof(unsigned int),
289 .mode = 0644,
290 .proc_handler = sched_proc_update_handler,
291 .extra1 = &min_sched_granularity_ns,
292 .extra2 = &max_sched_granularity_ns,
293 },
294 {
295 .procname = "sched_wakeup_granularity_ns",
296 .data = &sysctl_sched_wakeup_granularity,
297 .maxlen = sizeof(unsigned int),
298 .mode = 0644,
299 .proc_handler = sched_proc_update_handler,
300 .extra1 = &min_wakeup_granularity_ns,
301 .extra2 = &max_wakeup_granularity_ns,
302 },
303 {
304 .procname = "sched_tunable_scaling",
305 .data = &sysctl_sched_tunable_scaling,
306 .maxlen = sizeof(enum sched_tunable_scaling),
307 .mode = 0644,
308 .proc_handler = sched_proc_update_handler,
309 .extra1 = &min_sched_tunable_scaling,
310 .extra2 = &max_sched_tunable_scaling,
311 },
312 {
313 .procname = "sched_migration_cost",
314 .data = &sysctl_sched_migration_cost,
315 .maxlen = sizeof(unsigned int),
316 .mode = 0644,
317 .proc_handler = proc_dointvec,
318 },
319 {
320 .procname = "sched_nr_migrate",
321 .data = &sysctl_sched_nr_migrate,
322 .maxlen = sizeof(unsigned int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec,
325 },
326 {
327 .procname = "sched_time_avg",
328 .data = &sysctl_sched_time_avg,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec,
332 },
333 {
334 .procname = "sched_shares_window",
335 .data = &sysctl_sched_shares_window,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "timer_migration",
342 .data = &sysctl_timer_migration,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec_minmax,
346 .extra1 = &zero,
347 .extra2 = &one,
348 },
349 #endif
350 {
351 .procname = "sched_rt_period_us",
352 .data = &sysctl_sched_rt_period,
353 .maxlen = sizeof(unsigned int),
354 .mode = 0644,
355 .proc_handler = sched_rt_handler,
356 },
357 {
358 .procname = "sched_rt_runtime_us",
359 .data = &sysctl_sched_rt_runtime,
360 .maxlen = sizeof(int),
361 .mode = 0644,
362 .proc_handler = sched_rt_handler,
363 },
364 {
365 .procname = "sched_compat_yield",
366 .data = &sysctl_sched_compat_yield,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec,
370 },
371 #ifdef CONFIG_SCHED_AUTOGROUP
372 {
373 .procname = "sched_autogroup_enabled",
374 .data = &sysctl_sched_autogroup_enabled,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec,
378 .extra1 = &zero,
379 .extra2 = &one,
380 },
381 #endif
382 #ifdef CONFIG_PROVE_LOCKING
383 {
384 .procname = "prove_locking",
385 .data = &prove_locking,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec,
389 },
390 #endif
391 #ifdef CONFIG_LOCK_STAT
392 {
393 .procname = "lock_stat",
394 .data = &lock_stat,
395 .maxlen = sizeof(int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec,
398 },
399 #endif
400 {
401 .procname = "panic",
402 .data = &panic_timeout,
403 .maxlen = sizeof(int),
404 .mode = 0644,
405 .proc_handler = proc_dointvec,
406 },
407 {
408 .procname = "core_uses_pid",
409 .data = &core_uses_pid,
410 .maxlen = sizeof(int),
411 .mode = 0644,
412 .proc_handler = proc_dointvec,
413 },
414 {
415 .procname = "core_pattern",
416 .data = core_pattern,
417 .maxlen = CORENAME_MAX_SIZE,
418 .mode = 0644,
419 .proc_handler = proc_dostring,
420 },
421 {
422 .procname = "core_pipe_limit",
423 .data = &core_pipe_limit,
424 .maxlen = sizeof(unsigned int),
425 .mode = 0644,
426 .proc_handler = proc_dointvec,
427 },
428 #ifdef CONFIG_PROC_SYSCTL
429 {
430 .procname = "tainted",
431 .maxlen = sizeof(long),
432 .mode = 0644,
433 .proc_handler = proc_taint,
434 },
435 #endif
436 #ifdef CONFIG_LATENCYTOP
437 {
438 .procname = "latencytop",
439 .data = &latencytop_enabled,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec,
443 },
444 #endif
445 #ifdef CONFIG_BLK_DEV_INITRD
446 {
447 .procname = "real-root-dev",
448 .data = &real_root_dev,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec,
452 },
453 #endif
454 {
455 .procname = "print-fatal-signals",
456 .data = &print_fatal_signals,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 #ifdef CONFIG_SPARC
462 {
463 .procname = "reboot-cmd",
464 .data = reboot_command,
465 .maxlen = 256,
466 .mode = 0644,
467 .proc_handler = proc_dostring,
468 },
469 {
470 .procname = "stop-a",
471 .data = &stop_a_enabled,
472 .maxlen = sizeof (int),
473 .mode = 0644,
474 .proc_handler = proc_dointvec,
475 },
476 {
477 .procname = "scons-poweroff",
478 .data = &scons_pwroff,
479 .maxlen = sizeof (int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 #endif
484 #ifdef CONFIG_SPARC64
485 {
486 .procname = "tsb-ratio",
487 .data = &sysctl_tsb_ratio,
488 .maxlen = sizeof (int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 #endif
493 #ifdef __hppa__
494 {
495 .procname = "soft-power",
496 .data = &pwrsw_enabled,
497 .maxlen = sizeof (int),
498 .mode = 0644,
499 .proc_handler = proc_dointvec,
500 },
501 {
502 .procname = "unaligned-trap",
503 .data = &unaligned_enabled,
504 .maxlen = sizeof (int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec,
507 },
508 #endif
509 {
510 .procname = "ctrl-alt-del",
511 .data = &C_A_D,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = proc_dointvec,
515 },
516 #ifdef CONFIG_FUNCTION_TRACER
517 {
518 .procname = "ftrace_enabled",
519 .data = &ftrace_enabled,
520 .maxlen = sizeof(int),
521 .mode = 0644,
522 .proc_handler = ftrace_enable_sysctl,
523 },
524 #endif
525 #ifdef CONFIG_STACK_TRACER
526 {
527 .procname = "stack_tracer_enabled",
528 .data = &stack_tracer_enabled,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = stack_trace_sysctl,
532 },
533 #endif
534 #ifdef CONFIG_TRACING
535 {
536 .procname = "ftrace_dump_on_oops",
537 .data = &ftrace_dump_on_oops,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 #endif
543 #ifdef CONFIG_MODULES
544 {
545 .procname = "modprobe",
546 .data = &modprobe_path,
547 .maxlen = KMOD_PATH_LEN,
548 .mode = 0644,
549 .proc_handler = proc_dostring,
550 },
551 {
552 .procname = "modules_disabled",
553 .data = &modules_disabled,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 /* only handle a transition from default "0" to "1" */
557 .proc_handler = proc_dointvec_minmax,
558 .extra1 = &one,
559 .extra2 = &one,
560 },
561 #endif
562 #ifdef CONFIG_HOTPLUG
563 {
564 .procname = "hotplug",
565 .data = &uevent_helper,
566 .maxlen = UEVENT_HELPER_PATH_LEN,
567 .mode = 0644,
568 .proc_handler = proc_dostring,
569 },
570 #endif
571 #ifdef CONFIG_CHR_DEV_SG
572 {
573 .procname = "sg-big-buff",
574 .data = &sg_big_buff,
575 .maxlen = sizeof (int),
576 .mode = 0444,
577 .proc_handler = proc_dointvec,
578 },
579 #endif
580 #ifdef CONFIG_BSD_PROCESS_ACCT
581 {
582 .procname = "acct",
583 .data = &acct_parm,
584 .maxlen = 3*sizeof(int),
585 .mode = 0644,
586 .proc_handler = proc_dointvec,
587 },
588 #endif
589 #ifdef CONFIG_MAGIC_SYSRQ
590 {
591 .procname = "sysrq",
592 .data = &__sysrq_enabled,
593 .maxlen = sizeof (int),
594 .mode = 0644,
595 .proc_handler = sysrq_sysctl_handler,
596 },
597 #endif
598 #ifdef CONFIG_PROC_SYSCTL
599 {
600 .procname = "cad_pid",
601 .data = NULL,
602 .maxlen = sizeof (int),
603 .mode = 0600,
604 .proc_handler = proc_do_cad_pid,
605 },
606 #endif
607 {
608 .procname = "threads-max",
609 .data = &max_threads,
610 .maxlen = sizeof(int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec,
613 },
614 {
615 .procname = "random",
616 .mode = 0555,
617 .child = random_table,
618 },
619 {
620 .procname = "overflowuid",
621 .data = &overflowuid,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 .proc_handler = proc_dointvec_minmax,
625 .extra1 = &minolduid,
626 .extra2 = &maxolduid,
627 },
628 {
629 .procname = "overflowgid",
630 .data = &overflowgid,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = proc_dointvec_minmax,
634 .extra1 = &minolduid,
635 .extra2 = &maxolduid,
636 },
637 #ifdef CONFIG_S390
638 #ifdef CONFIG_MATHEMU
639 {
640 .procname = "ieee_emulation_warnings",
641 .data = &sysctl_ieee_emulation_warnings,
642 .maxlen = sizeof(int),
643 .mode = 0644,
644 .proc_handler = proc_dointvec,
645 },
646 #endif
647 {
648 .procname = "userprocess_debug",
649 .data = &show_unhandled_signals,
650 .maxlen = sizeof(int),
651 .mode = 0644,
652 .proc_handler = proc_dointvec,
653 },
654 #endif
655 {
656 .procname = "pid_max",
657 .data = &pid_max,
658 .maxlen = sizeof (int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec_minmax,
661 .extra1 = &pid_max_min,
662 .extra2 = &pid_max_max,
663 },
664 {
665 .procname = "panic_on_oops",
666 .data = &panic_on_oops,
667 .maxlen = sizeof(int),
668 .mode = 0644,
669 .proc_handler = proc_dointvec,
670 },
671 #if defined CONFIG_PRINTK
672 {
673 .procname = "printk",
674 .data = &console_loglevel,
675 .maxlen = 4*sizeof(int),
676 .mode = 0644,
677 .proc_handler = proc_dointvec,
678 },
679 {
680 .procname = "printk_ratelimit",
681 .data = &printk_ratelimit_state.interval,
682 .maxlen = sizeof(int),
683 .mode = 0644,
684 .proc_handler = proc_dointvec_jiffies,
685 },
686 {
687 .procname = "printk_ratelimit_burst",
688 .data = &printk_ratelimit_state.burst,
689 .maxlen = sizeof(int),
690 .mode = 0644,
691 .proc_handler = proc_dointvec,
692 },
693 {
694 .procname = "printk_delay",
695 .data = &printk_delay_msec,
696 .maxlen = sizeof(int),
697 .mode = 0644,
698 .proc_handler = proc_dointvec_minmax,
699 .extra1 = &zero,
700 .extra2 = &ten_thousand,
701 },
702 {
703 .procname = "dmesg_restrict",
704 .data = &dmesg_restrict,
705 .maxlen = sizeof(int),
706 .mode = 0644,
707 .proc_handler = proc_dointvec_minmax,
708 .extra1 = &zero,
709 .extra2 = &one,
710 },
711 {
712 .procname = "kptr_restrict",
713 .data = &kptr_restrict,
714 .maxlen = sizeof(int),
715 .mode = 0644,
716 .proc_handler = proc_dointvec_minmax,
717 .extra1 = &zero,
718 .extra2 = &two,
719 },
720 #endif
721 {
722 .procname = "ngroups_max",
723 .data = &ngroups_max,
724 .maxlen = sizeof (int),
725 .mode = 0444,
726 .proc_handler = proc_dointvec,
727 },
728 #if defined(CONFIG_LOCKUP_DETECTOR)
729 {
730 .procname = "watchdog",
731 .data = &watchdog_enabled,
732 .maxlen = sizeof (int),
733 .mode = 0644,
734 .proc_handler = proc_dowatchdog_enabled,
735 },
736 {
737 .procname = "watchdog_thresh",
738 .data = &softlockup_thresh,
739 .maxlen = sizeof(int),
740 .mode = 0644,
741 .proc_handler = proc_dowatchdog_thresh,
742 .extra1 = &neg_one,
743 .extra2 = &sixty,
744 },
745 {
746 .procname = "softlockup_panic",
747 .data = &softlockup_panic,
748 .maxlen = sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec_minmax,
751 .extra1 = &zero,
752 .extra2 = &one,
753 },
754 {
755 .procname = "nmi_watchdog",
756 .data = &watchdog_enabled,
757 .maxlen = sizeof (int),
758 .mode = 0644,
759 .proc_handler = proc_dowatchdog_enabled,
760 },
761 #endif
762 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
763 {
764 .procname = "unknown_nmi_panic",
765 .data = &unknown_nmi_panic,
766 .maxlen = sizeof (int),
767 .mode = 0644,
768 .proc_handler = proc_dointvec,
769 },
770 #endif
771 #if defined(CONFIG_X86)
772 {
773 .procname = "panic_on_unrecovered_nmi",
774 .data = &panic_on_unrecovered_nmi,
775 .maxlen = sizeof(int),
776 .mode = 0644,
777 .proc_handler = proc_dointvec,
778 },
779 {
780 .procname = "panic_on_io_nmi",
781 .data = &panic_on_io_nmi,
782 .maxlen = sizeof(int),
783 .mode = 0644,
784 .proc_handler = proc_dointvec,
785 },
786 {
787 .procname = "bootloader_type",
788 .data = &bootloader_type,
789 .maxlen = sizeof (int),
790 .mode = 0444,
791 .proc_handler = proc_dointvec,
792 },
793 {
794 .procname = "bootloader_version",
795 .data = &bootloader_version,
796 .maxlen = sizeof (int),
797 .mode = 0444,
798 .proc_handler = proc_dointvec,
799 },
800 {
801 .procname = "kstack_depth_to_print",
802 .data = &kstack_depth_to_print,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec,
806 },
807 {
808 .procname = "io_delay_type",
809 .data = &io_delay_type,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec,
813 },
814 #endif
815 #if defined(CONFIG_MMU)
816 {
817 .procname = "randomize_va_space",
818 .data = &randomize_va_space,
819 .maxlen = sizeof(int),
820 .mode = 0644,
821 .proc_handler = proc_dointvec,
822 },
823 #endif
824 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
825 {
826 .procname = "spin_retry",
827 .data = &spin_retry,
828 .maxlen = sizeof (int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec,
831 },
832 #endif
833 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
834 {
835 .procname = "acpi_video_flags",
836 .data = &acpi_realmode_flags,
837 .maxlen = sizeof (unsigned long),
838 .mode = 0644,
839 .proc_handler = proc_doulongvec_minmax,
840 },
841 #endif
842 #ifdef CONFIG_IA64
843 {
844 .procname = "ignore-unaligned-usertrap",
845 .data = &no_unaligned_warning,
846 .maxlen = sizeof (int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec,
849 },
850 {
851 .procname = "unaligned-dump-stack",
852 .data = &unaligned_dump_stack,
853 .maxlen = sizeof (int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec,
856 },
857 #endif
858 #ifdef CONFIG_DETECT_HUNG_TASK
859 {
860 .procname = "hung_task_panic",
861 .data = &sysctl_hung_task_panic,
862 .maxlen = sizeof(int),
863 .mode = 0644,
864 .proc_handler = proc_dointvec_minmax,
865 .extra1 = &zero,
866 .extra2 = &one,
867 },
868 {
869 .procname = "hung_task_check_count",
870 .data = &sysctl_hung_task_check_count,
871 .maxlen = sizeof(unsigned long),
872 .mode = 0644,
873 .proc_handler = proc_doulongvec_minmax,
874 },
875 {
876 .procname = "hung_task_timeout_secs",
877 .data = &sysctl_hung_task_timeout_secs,
878 .maxlen = sizeof(unsigned long),
879 .mode = 0644,
880 .proc_handler = proc_dohung_task_timeout_secs,
881 },
882 {
883 .procname = "hung_task_warnings",
884 .data = &sysctl_hung_task_warnings,
885 .maxlen = sizeof(unsigned long),
886 .mode = 0644,
887 .proc_handler = proc_doulongvec_minmax,
888 },
889 #endif
890 #ifdef CONFIG_COMPAT
891 {
892 .procname = "compat-log",
893 .data = &compat_log,
894 .maxlen = sizeof (int),
895 .mode = 0644,
896 .proc_handler = proc_dointvec,
897 },
898 #endif
899 #ifdef CONFIG_RT_MUTEXES
900 {
901 .procname = "max_lock_depth",
902 .data = &max_lock_depth,
903 .maxlen = sizeof(int),
904 .mode = 0644,
905 .proc_handler = proc_dointvec,
906 },
907 #endif
908 {
909 .procname = "poweroff_cmd",
910 .data = &poweroff_cmd,
911 .maxlen = POWEROFF_CMD_PATH_LEN,
912 .mode = 0644,
913 .proc_handler = proc_dostring,
914 },
915 #ifdef CONFIG_KEYS
916 {
917 .procname = "keys",
918 .mode = 0555,
919 .child = key_sysctls,
920 },
921 #endif
922 #ifdef CONFIG_RCU_TORTURE_TEST
923 {
924 .procname = "rcutorture_runnable",
925 .data = &rcutorture_runnable,
926 .maxlen = sizeof(int),
927 .mode = 0644,
928 .proc_handler = proc_dointvec,
929 },
930 #endif
931 #ifdef CONFIG_PERF_EVENTS
932 {
933 .procname = "perf_event_paranoid",
934 .data = &sysctl_perf_event_paranoid,
935 .maxlen = sizeof(sysctl_perf_event_paranoid),
936 .mode = 0644,
937 .proc_handler = proc_dointvec,
938 },
939 {
940 .procname = "perf_event_mlock_kb",
941 .data = &sysctl_perf_event_mlock,
942 .maxlen = sizeof(sysctl_perf_event_mlock),
943 .mode = 0644,
944 .proc_handler = proc_dointvec,
945 },
946 {
947 .procname = "perf_event_max_sample_rate",
948 .data = &sysctl_perf_event_sample_rate,
949 .maxlen = sizeof(sysctl_perf_event_sample_rate),
950 .mode = 0644,
951 .proc_handler = proc_dointvec,
952 },
953 #endif
954 #ifdef CONFIG_KMEMCHECK
955 {
956 .procname = "kmemcheck",
957 .data = &kmemcheck_enabled,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec,
961 },
962 #endif
963 #ifdef CONFIG_BLOCK
964 {
965 .procname = "blk_iopoll",
966 .data = &blk_iopoll_enabled,
967 .maxlen = sizeof(int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec,
970 },
971 #endif
972 { }
973 };
974
975 static struct ctl_table vm_table[] = {
976 {
977 .procname = "overcommit_memory",
978 .data = &sysctl_overcommit_memory,
979 .maxlen = sizeof(sysctl_overcommit_memory),
980 .mode = 0644,
981 .proc_handler = proc_dointvec,
982 },
983 {
984 .procname = "panic_on_oom",
985 .data = &sysctl_panic_on_oom,
986 .maxlen = sizeof(sysctl_panic_on_oom),
987 .mode = 0644,
988 .proc_handler = proc_dointvec,
989 },
990 {
991 .procname = "oom_kill_allocating_task",
992 .data = &sysctl_oom_kill_allocating_task,
993 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
994 .mode = 0644,
995 .proc_handler = proc_dointvec,
996 },
997 {
998 .procname = "oom_dump_tasks",
999 .data = &sysctl_oom_dump_tasks,
1000 .maxlen = sizeof(sysctl_oom_dump_tasks),
1001 .mode = 0644,
1002 .proc_handler = proc_dointvec,
1003 },
1004 {
1005 .procname = "overcommit_ratio",
1006 .data = &sysctl_overcommit_ratio,
1007 .maxlen = sizeof(sysctl_overcommit_ratio),
1008 .mode = 0644,
1009 .proc_handler = proc_dointvec,
1010 },
1011 {
1012 .procname = "page-cluster",
1013 .data = &page_cluster,
1014 .maxlen = sizeof(int),
1015 .mode = 0644,
1016 .proc_handler = proc_dointvec,
1017 },
1018 {
1019 .procname = "dirty_background_ratio",
1020 .data = &dirty_background_ratio,
1021 .maxlen = sizeof(dirty_background_ratio),
1022 .mode = 0644,
1023 .proc_handler = dirty_background_ratio_handler,
1024 .extra1 = &zero,
1025 .extra2 = &one_hundred,
1026 },
1027 {
1028 .procname = "dirty_background_bytes",
1029 .data = &dirty_background_bytes,
1030 .maxlen = sizeof(dirty_background_bytes),
1031 .mode = 0644,
1032 .proc_handler = dirty_background_bytes_handler,
1033 .extra1 = &one_ul,
1034 },
1035 {
1036 .procname = "dirty_ratio",
1037 .data = &vm_dirty_ratio,
1038 .maxlen = sizeof(vm_dirty_ratio),
1039 .mode = 0644,
1040 .proc_handler = dirty_ratio_handler,
1041 .extra1 = &zero,
1042 .extra2 = &one_hundred,
1043 },
1044 {
1045 .procname = "dirty_bytes",
1046 .data = &vm_dirty_bytes,
1047 .maxlen = sizeof(vm_dirty_bytes),
1048 .mode = 0644,
1049 .proc_handler = dirty_bytes_handler,
1050 .extra1 = &dirty_bytes_min,
1051 },
1052 {
1053 .procname = "dirty_writeback_centisecs",
1054 .data = &dirty_writeback_interval,
1055 .maxlen = sizeof(dirty_writeback_interval),
1056 .mode = 0644,
1057 .proc_handler = dirty_writeback_centisecs_handler,
1058 },
1059 {
1060 .procname = "dirty_expire_centisecs",
1061 .data = &dirty_expire_interval,
1062 .maxlen = sizeof(dirty_expire_interval),
1063 .mode = 0644,
1064 .proc_handler = proc_dointvec,
1065 },
1066 {
1067 .procname = "nr_pdflush_threads",
1068 .data = &nr_pdflush_threads,
1069 .maxlen = sizeof nr_pdflush_threads,
1070 .mode = 0444 /* read-only*/,
1071 .proc_handler = proc_dointvec,
1072 },
1073 {
1074 .procname = "swappiness",
1075 .data = &vm_swappiness,
1076 .maxlen = sizeof(vm_swappiness),
1077 .mode = 0644,
1078 .proc_handler = proc_dointvec_minmax,
1079 .extra1 = &zero,
1080 .extra2 = &one_hundred,
1081 },
1082 #ifdef CONFIG_HUGETLB_PAGE
1083 {
1084 .procname = "nr_hugepages",
1085 .data = NULL,
1086 .maxlen = sizeof(unsigned long),
1087 .mode = 0644,
1088 .proc_handler = hugetlb_sysctl_handler,
1089 .extra1 = (void *)&hugetlb_zero,
1090 .extra2 = (void *)&hugetlb_infinity,
1091 },
1092 #ifdef CONFIG_NUMA
1093 {
1094 .procname = "nr_hugepages_mempolicy",
1095 .data = NULL,
1096 .maxlen = sizeof(unsigned long),
1097 .mode = 0644,
1098 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1099 .extra1 = (void *)&hugetlb_zero,
1100 .extra2 = (void *)&hugetlb_infinity,
1101 },
1102 #endif
1103 {
1104 .procname = "hugetlb_shm_group",
1105 .data = &sysctl_hugetlb_shm_group,
1106 .maxlen = sizeof(gid_t),
1107 .mode = 0644,
1108 .proc_handler = proc_dointvec,
1109 },
1110 {
1111 .procname = "hugepages_treat_as_movable",
1112 .data = &hugepages_treat_as_movable,
1113 .maxlen = sizeof(int),
1114 .mode = 0644,
1115 .proc_handler = hugetlb_treat_movable_handler,
1116 },
1117 {
1118 .procname = "nr_overcommit_hugepages",
1119 .data = NULL,
1120 .maxlen = sizeof(unsigned long),
1121 .mode = 0644,
1122 .proc_handler = hugetlb_overcommit_handler,
1123 .extra1 = (void *)&hugetlb_zero,
1124 .extra2 = (void *)&hugetlb_infinity,
1125 },
1126 #endif
1127 {
1128 .procname = "lowmem_reserve_ratio",
1129 .data = &sysctl_lowmem_reserve_ratio,
1130 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1131 .mode = 0644,
1132 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1133 },
1134 {
1135 .procname = "drop_caches",
1136 .data = &sysctl_drop_caches,
1137 .maxlen = sizeof(int),
1138 .mode = 0644,
1139 .proc_handler = drop_caches_sysctl_handler,
1140 },
1141 #ifdef CONFIG_COMPACTION
1142 {
1143 .procname = "compact_memory",
1144 .data = &sysctl_compact_memory,
1145 .maxlen = sizeof(int),
1146 .mode = 0200,
1147 .proc_handler = sysctl_compaction_handler,
1148 },
1149 {
1150 .procname = "extfrag_threshold",
1151 .data = &sysctl_extfrag_threshold,
1152 .maxlen = sizeof(int),
1153 .mode = 0644,
1154 .proc_handler = sysctl_extfrag_handler,
1155 .extra1 = &min_extfrag_threshold,
1156 .extra2 = &max_extfrag_threshold,
1157 },
1158
1159 #endif /* CONFIG_COMPACTION */
1160 {
1161 .procname = "min_free_kbytes",
1162 .data = &min_free_kbytes,
1163 .maxlen = sizeof(min_free_kbytes),
1164 .mode = 0644,
1165 .proc_handler = min_free_kbytes_sysctl_handler,
1166 .extra1 = &zero,
1167 },
1168 {
1169 .procname = "percpu_pagelist_fraction",
1170 .data = &percpu_pagelist_fraction,
1171 .maxlen = sizeof(percpu_pagelist_fraction),
1172 .mode = 0644,
1173 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1174 .extra1 = &min_percpu_pagelist_fract,
1175 },
1176 #ifdef CONFIG_MMU
1177 {
1178 .procname = "max_map_count",
1179 .data = &sysctl_max_map_count,
1180 .maxlen = sizeof(sysctl_max_map_count),
1181 .mode = 0644,
1182 .proc_handler = proc_dointvec_minmax,
1183 .extra1 = &zero,
1184 },
1185 #else
1186 {
1187 .procname = "nr_trim_pages",
1188 .data = &sysctl_nr_trim_pages,
1189 .maxlen = sizeof(sysctl_nr_trim_pages),
1190 .mode = 0644,
1191 .proc_handler = proc_dointvec_minmax,
1192 .extra1 = &zero,
1193 },
1194 #endif
1195 {
1196 .procname = "laptop_mode",
1197 .data = &laptop_mode,
1198 .maxlen = sizeof(laptop_mode),
1199 .mode = 0644,
1200 .proc_handler = proc_dointvec_jiffies,
1201 },
1202 {
1203 .procname = "block_dump",
1204 .data = &block_dump,
1205 .maxlen = sizeof(block_dump),
1206 .mode = 0644,
1207 .proc_handler = proc_dointvec,
1208 .extra1 = &zero,
1209 },
1210 {
1211 .procname = "vfs_cache_pressure",
1212 .data = &sysctl_vfs_cache_pressure,
1213 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1214 .mode = 0644,
1215 .proc_handler = proc_dointvec,
1216 .extra1 = &zero,
1217 },
1218 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1219 {
1220 .procname = "legacy_va_layout",
1221 .data = &sysctl_legacy_va_layout,
1222 .maxlen = sizeof(sysctl_legacy_va_layout),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec,
1225 .extra1 = &zero,
1226 },
1227 #endif
1228 #ifdef CONFIG_NUMA
1229 {
1230 .procname = "zone_reclaim_mode",
1231 .data = &zone_reclaim_mode,
1232 .maxlen = sizeof(zone_reclaim_mode),
1233 .mode = 0644,
1234 .proc_handler = proc_dointvec,
1235 .extra1 = &zero,
1236 },
1237 {
1238 .procname = "min_unmapped_ratio",
1239 .data = &sysctl_min_unmapped_ratio,
1240 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1241 .mode = 0644,
1242 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1243 .extra1 = &zero,
1244 .extra2 = &one_hundred,
1245 },
1246 {
1247 .procname = "min_slab_ratio",
1248 .data = &sysctl_min_slab_ratio,
1249 .maxlen = sizeof(sysctl_min_slab_ratio),
1250 .mode = 0644,
1251 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1252 .extra1 = &zero,
1253 .extra2 = &one_hundred,
1254 },
1255 #endif
1256 #ifdef CONFIG_SMP
1257 {
1258 .procname = "stat_interval",
1259 .data = &sysctl_stat_interval,
1260 .maxlen = sizeof(sysctl_stat_interval),
1261 .mode = 0644,
1262 .proc_handler = proc_dointvec_jiffies,
1263 },
1264 #endif
1265 #ifdef CONFIG_MMU
1266 {
1267 .procname = "mmap_min_addr",
1268 .data = &dac_mmap_min_addr,
1269 .maxlen = sizeof(unsigned long),
1270 .mode = 0644,
1271 .proc_handler = mmap_min_addr_handler,
1272 },
1273 #endif
1274 #ifdef CONFIG_NUMA
1275 {
1276 .procname = "numa_zonelist_order",
1277 .data = &numa_zonelist_order,
1278 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1279 .mode = 0644,
1280 .proc_handler = numa_zonelist_order_handler,
1281 },
1282 #endif
1283 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1284 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1285 {
1286 .procname = "vdso_enabled",
1287 .data = &vdso_enabled,
1288 .maxlen = sizeof(vdso_enabled),
1289 .mode = 0644,
1290 .proc_handler = proc_dointvec,
1291 .extra1 = &zero,
1292 },
1293 #endif
1294 #ifdef CONFIG_HIGHMEM
1295 {
1296 .procname = "highmem_is_dirtyable",
1297 .data = &vm_highmem_is_dirtyable,
1298 .maxlen = sizeof(vm_highmem_is_dirtyable),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec_minmax,
1301 .extra1 = &zero,
1302 .extra2 = &one,
1303 },
1304 #endif
1305 {
1306 .procname = "scan_unevictable_pages",
1307 .data = &scan_unevictable_pages,
1308 .maxlen = sizeof(scan_unevictable_pages),
1309 .mode = 0644,
1310 .proc_handler = scan_unevictable_handler,
1311 },
1312 #ifdef CONFIG_MEMORY_FAILURE
1313 {
1314 .procname = "memory_failure_early_kill",
1315 .data = &sysctl_memory_failure_early_kill,
1316 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1317 .mode = 0644,
1318 .proc_handler = proc_dointvec_minmax,
1319 .extra1 = &zero,
1320 .extra2 = &one,
1321 },
1322 {
1323 .procname = "memory_failure_recovery",
1324 .data = &sysctl_memory_failure_recovery,
1325 .maxlen = sizeof(sysctl_memory_failure_recovery),
1326 .mode = 0644,
1327 .proc_handler = proc_dointvec_minmax,
1328 .extra1 = &zero,
1329 .extra2 = &one,
1330 },
1331 #endif
1332 { }
1333 };
1334
1335 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1336 static struct ctl_table binfmt_misc_table[] = {
1337 { }
1338 };
1339 #endif
1340
1341 static struct ctl_table fs_table[] = {
1342 {
1343 .procname = "inode-nr",
1344 .data = &inodes_stat,
1345 .maxlen = 2*sizeof(int),
1346 .mode = 0444,
1347 .proc_handler = proc_nr_inodes,
1348 },
1349 {
1350 .procname = "inode-state",
1351 .data = &inodes_stat,
1352 .maxlen = 7*sizeof(int),
1353 .mode = 0444,
1354 .proc_handler = proc_nr_inodes,
1355 },
1356 {
1357 .procname = "file-nr",
1358 .data = &files_stat,
1359 .maxlen = sizeof(files_stat),
1360 .mode = 0444,
1361 .proc_handler = proc_nr_files,
1362 },
1363 {
1364 .procname = "file-max",
1365 .data = &files_stat.max_files,
1366 .maxlen = sizeof(files_stat.max_files),
1367 .mode = 0644,
1368 .proc_handler = proc_doulongvec_minmax,
1369 },
1370 {
1371 .procname = "nr_open",
1372 .data = &sysctl_nr_open,
1373 .maxlen = sizeof(int),
1374 .mode = 0644,
1375 .proc_handler = proc_dointvec_minmax,
1376 .extra1 = &sysctl_nr_open_min,
1377 .extra2 = &sysctl_nr_open_max,
1378 },
1379 {
1380 .procname = "dentry-state",
1381 .data = &dentry_stat,
1382 .maxlen = 6*sizeof(int),
1383 .mode = 0444,
1384 .proc_handler = proc_nr_dentry,
1385 },
1386 {
1387 .procname = "overflowuid",
1388 .data = &fs_overflowuid,
1389 .maxlen = sizeof(int),
1390 .mode = 0644,
1391 .proc_handler = proc_dointvec_minmax,
1392 .extra1 = &minolduid,
1393 .extra2 = &maxolduid,
1394 },
1395 {
1396 .procname = "overflowgid",
1397 .data = &fs_overflowgid,
1398 .maxlen = sizeof(int),
1399 .mode = 0644,
1400 .proc_handler = proc_dointvec_minmax,
1401 .extra1 = &minolduid,
1402 .extra2 = &maxolduid,
1403 },
1404 #ifdef CONFIG_FILE_LOCKING
1405 {
1406 .procname = "leases-enable",
1407 .data = &leases_enable,
1408 .maxlen = sizeof(int),
1409 .mode = 0644,
1410 .proc_handler = proc_dointvec,
1411 },
1412 #endif
1413 #ifdef CONFIG_DNOTIFY
1414 {
1415 .procname = "dir-notify-enable",
1416 .data = &dir_notify_enable,
1417 .maxlen = sizeof(int),
1418 .mode = 0644,
1419 .proc_handler = proc_dointvec,
1420 },
1421 #endif
1422 #ifdef CONFIG_MMU
1423 #ifdef CONFIG_FILE_LOCKING
1424 {
1425 .procname = "lease-break-time",
1426 .data = &lease_break_time,
1427 .maxlen = sizeof(int),
1428 .mode = 0644,
1429 .proc_handler = proc_dointvec,
1430 },
1431 #endif
1432 #ifdef CONFIG_AIO
1433 {
1434 .procname = "aio-nr",
1435 .data = &aio_nr,
1436 .maxlen = sizeof(aio_nr),
1437 .mode = 0444,
1438 .proc_handler = proc_doulongvec_minmax,
1439 },
1440 {
1441 .procname = "aio-max-nr",
1442 .data = &aio_max_nr,
1443 .maxlen = sizeof(aio_max_nr),
1444 .mode = 0644,
1445 .proc_handler = proc_doulongvec_minmax,
1446 },
1447 #endif /* CONFIG_AIO */
1448 #ifdef CONFIG_INOTIFY_USER
1449 {
1450 .procname = "inotify",
1451 .mode = 0555,
1452 .child = inotify_table,
1453 },
1454 #endif
1455 #ifdef CONFIG_EPOLL
1456 {
1457 .procname = "epoll",
1458 .mode = 0555,
1459 .child = epoll_table,
1460 },
1461 #endif
1462 #endif
1463 {
1464 .procname = "suid_dumpable",
1465 .data = &suid_dumpable,
1466 .maxlen = sizeof(int),
1467 .mode = 0644,
1468 .proc_handler = proc_dointvec_minmax,
1469 .extra1 = &zero,
1470 .extra2 = &two,
1471 },
1472 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1473 {
1474 .procname = "binfmt_misc",
1475 .mode = 0555,
1476 .child = binfmt_misc_table,
1477 },
1478 #endif
1479 {
1480 .procname = "pipe-max-size",
1481 .data = &pipe_max_size,
1482 .maxlen = sizeof(int),
1483 .mode = 0644,
1484 .proc_handler = &pipe_proc_fn,
1485 .extra1 = &pipe_min_size,
1486 },
1487 { }
1488 };
1489
1490 static struct ctl_table debug_table[] = {
1491 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1492 defined(CONFIG_S390)
1493 {
1494 .procname = "exception-trace",
1495 .data = &show_unhandled_signals,
1496 .maxlen = sizeof(int),
1497 .mode = 0644,
1498 .proc_handler = proc_dointvec
1499 },
1500 #endif
1501 #if defined(CONFIG_OPTPROBES)
1502 {
1503 .procname = "kprobes-optimization",
1504 .data = &sysctl_kprobes_optimization,
1505 .maxlen = sizeof(int),
1506 .mode = 0644,
1507 .proc_handler = proc_kprobes_optimization_handler,
1508 .extra1 = &zero,
1509 .extra2 = &one,
1510 },
1511 #endif
1512 { }
1513 };
1514
1515 static struct ctl_table dev_table[] = {
1516 { }
1517 };
1518
1519 static DEFINE_SPINLOCK(sysctl_lock);
1520
1521 /* called under sysctl_lock */
1522 static int use_table(struct ctl_table_header *p)
1523 {
1524 if (unlikely(p->unregistering))
1525 return 0;
1526 p->used++;
1527 return 1;
1528 }
1529
1530 /* called under sysctl_lock */
1531 static void unuse_table(struct ctl_table_header *p)
1532 {
1533 if (!--p->used)
1534 if (unlikely(p->unregistering))
1535 complete(p->unregistering);
1536 }
1537
1538 /* called under sysctl_lock, will reacquire if has to wait */
1539 static void start_unregistering(struct ctl_table_header *p)
1540 {
1541 /*
1542 * if p->used is 0, nobody will ever touch that entry again;
1543 * we'll eliminate all paths to it before dropping sysctl_lock
1544 */
1545 if (unlikely(p->used)) {
1546 struct completion wait;
1547 init_completion(&wait);
1548 p->unregistering = &wait;
1549 spin_unlock(&sysctl_lock);
1550 wait_for_completion(&wait);
1551 spin_lock(&sysctl_lock);
1552 } else {
1553 /* anything non-NULL; we'll never dereference it */
1554 p->unregistering = ERR_PTR(-EINVAL);
1555 }
1556 /*
1557 * do not remove from the list until nobody holds it; walking the
1558 * list in do_sysctl() relies on that.
1559 */
1560 list_del_init(&p->ctl_entry);
1561 }
1562
1563 void sysctl_head_get(struct ctl_table_header *head)
1564 {
1565 spin_lock(&sysctl_lock);
1566 head->count++;
1567 spin_unlock(&sysctl_lock);
1568 }
1569
1570 void sysctl_head_put(struct ctl_table_header *head)
1571 {
1572 spin_lock(&sysctl_lock);
1573 if (!--head->count)
1574 kfree(head);
1575 spin_unlock(&sysctl_lock);
1576 }
1577
1578 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1579 {
1580 if (!head)
1581 BUG();
1582 spin_lock(&sysctl_lock);
1583 if (!use_table(head))
1584 head = ERR_PTR(-ENOENT);
1585 spin_unlock(&sysctl_lock);
1586 return head;
1587 }
1588
1589 void sysctl_head_finish(struct ctl_table_header *head)
1590 {
1591 if (!head)
1592 return;
1593 spin_lock(&sysctl_lock);
1594 unuse_table(head);
1595 spin_unlock(&sysctl_lock);
1596 }
1597
1598 static struct ctl_table_set *
1599 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1600 {
1601 struct ctl_table_set *set = &root->default_set;
1602 if (root->lookup)
1603 set = root->lookup(root, namespaces);
1604 return set;
1605 }
1606
1607 static struct list_head *
1608 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1609 {
1610 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1611 return &set->list;
1612 }
1613
1614 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1615 struct ctl_table_header *prev)
1616 {
1617 struct ctl_table_root *root;
1618 struct list_head *header_list;
1619 struct ctl_table_header *head;
1620 struct list_head *tmp;
1621
1622 spin_lock(&sysctl_lock);
1623 if (prev) {
1624 head = prev;
1625 tmp = &prev->ctl_entry;
1626 unuse_table(prev);
1627 goto next;
1628 }
1629 tmp = &root_table_header.ctl_entry;
1630 for (;;) {
1631 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1632
1633 if (!use_table(head))
1634 goto next;
1635 spin_unlock(&sysctl_lock);
1636 return head;
1637 next:
1638 root = head->root;
1639 tmp = tmp->next;
1640 header_list = lookup_header_list(root, namespaces);
1641 if (tmp != header_list)
1642 continue;
1643
1644 do {
1645 root = list_entry(root->root_list.next,
1646 struct ctl_table_root, root_list);
1647 if (root == &sysctl_table_root)
1648 goto out;
1649 header_list = lookup_header_list(root, namespaces);
1650 } while (list_empty(header_list));
1651 tmp = header_list->next;
1652 }
1653 out:
1654 spin_unlock(&sysctl_lock);
1655 return NULL;
1656 }
1657
1658 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1659 {
1660 return __sysctl_head_next(current->nsproxy, prev);
1661 }
1662
1663 void register_sysctl_root(struct ctl_table_root *root)
1664 {
1665 spin_lock(&sysctl_lock);
1666 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1667 spin_unlock(&sysctl_lock);
1668 }
1669
1670 /*
1671 * sysctl_perm does NOT grant the superuser all rights automatically, because
1672 * some sysctl variables are readonly even to root.
1673 */
1674
1675 static int test_perm(int mode, int op)
1676 {
1677 if (!current_euid())
1678 mode >>= 6;
1679 else if (in_egroup_p(0))
1680 mode >>= 3;
1681 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1682 return 0;
1683 return -EACCES;
1684 }
1685
1686 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1687 {
1688 int error;
1689 int mode;
1690
1691 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1692 if (error)
1693 return error;
1694
1695 if (root->permissions)
1696 mode = root->permissions(root, current->nsproxy, table);
1697 else
1698 mode = table->mode;
1699
1700 return test_perm(mode, op);
1701 }
1702
1703 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1704 {
1705 for (; table->procname; table++) {
1706 table->parent = parent;
1707 if (table->child)
1708 sysctl_set_parent(table, table->child);
1709 }
1710 }
1711
1712 static __init int sysctl_init(void)
1713 {
1714 sysctl_set_parent(NULL, root_table);
1715 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1716 sysctl_check_table(current->nsproxy, root_table);
1717 #endif
1718 return 0;
1719 }
1720
1721 core_initcall(sysctl_init);
1722
1723 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1724 struct ctl_table *table)
1725 {
1726 struct ctl_table *p;
1727 const char *s = branch->procname;
1728
1729 /* branch should have named subdirectory as its first element */
1730 if (!s || !branch->child)
1731 return NULL;
1732
1733 /* ... and nothing else */
1734 if (branch[1].procname)
1735 return NULL;
1736
1737 /* table should contain subdirectory with the same name */
1738 for (p = table; p->procname; p++) {
1739 if (!p->child)
1740 continue;
1741 if (p->procname && strcmp(p->procname, s) == 0)
1742 return p;
1743 }
1744 return NULL;
1745 }
1746
1747 /* see if attaching q to p would be an improvement */
1748 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1749 {
1750 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1751 struct ctl_table *next;
1752 int is_better = 0;
1753 int not_in_parent = !p->attached_by;
1754
1755 while ((next = is_branch_in(by, to)) != NULL) {
1756 if (by == q->attached_by)
1757 is_better = 1;
1758 if (to == p->attached_by)
1759 not_in_parent = 1;
1760 by = by->child;
1761 to = next->child;
1762 }
1763
1764 if (is_better && not_in_parent) {
1765 q->attached_by = by;
1766 q->attached_to = to;
1767 q->parent = p;
1768 }
1769 }
1770
1771 /**
1772 * __register_sysctl_paths - register a sysctl hierarchy
1773 * @root: List of sysctl headers to register on
1774 * @namespaces: Data to compute which lists of sysctl entries are visible
1775 * @path: The path to the directory the sysctl table is in.
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 * The members of the &struct ctl_table structure are used as follows:
1782 *
1783 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1784 * enter a sysctl file
1785 *
1786 * data - a pointer to data for use by proc_handler
1787 *
1788 * maxlen - the maximum size in bytes of the data
1789 *
1790 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1791 *
1792 * child - a pointer to the child sysctl table if this entry is a directory, or
1793 * %NULL.
1794 *
1795 * proc_handler - the text handler routine (described below)
1796 *
1797 * de - for internal use by the sysctl routines
1798 *
1799 * extra1, extra2 - extra pointers usable by the proc handler routines
1800 *
1801 * Leaf nodes in the sysctl tree will be represented by a single file
1802 * under /proc; non-leaf nodes will be represented by directories.
1803 *
1804 * sysctl(2) can automatically manage read and write requests through
1805 * the sysctl table. The data and maxlen fields of the ctl_table
1806 * struct enable minimal validation of the values being written to be
1807 * performed, and the mode field allows minimal authentication.
1808 *
1809 * There must be a proc_handler routine for any terminal nodes
1810 * mirrored under /proc/sys (non-terminals are handled by a built-in
1811 * directory handler). Several default handlers are available to
1812 * cover common cases -
1813 *
1814 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1815 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1816 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1817 *
1818 * It is the handler's job to read the input buffer from user memory
1819 * and process it. The handler should return 0 on success.
1820 *
1821 * This routine returns %NULL on a failure to register, and a pointer
1822 * to the table header on success.
1823 */
1824 struct ctl_table_header *__register_sysctl_paths(
1825 struct ctl_table_root *root,
1826 struct nsproxy *namespaces,
1827 const struct ctl_path *path, struct ctl_table *table)
1828 {
1829 struct ctl_table_header *header;
1830 struct ctl_table *new, **prevp;
1831 unsigned int n, npath;
1832 struct ctl_table_set *set;
1833
1834 /* Count the path components */
1835 for (npath = 0; path[npath].procname; ++npath)
1836 ;
1837
1838 /*
1839 * For each path component, allocate a 2-element ctl_table array.
1840 * The first array element will be filled with the sysctl entry
1841 * for this, the second will be the sentinel (procname == 0).
1842 *
1843 * We allocate everything in one go so that we don't have to
1844 * worry about freeing additional memory in unregister_sysctl_table.
1845 */
1846 header = kzalloc(sizeof(struct ctl_table_header) +
1847 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1848 if (!header)
1849 return NULL;
1850
1851 new = (struct ctl_table *) (header + 1);
1852
1853 /* Now connect the dots */
1854 prevp = &header->ctl_table;
1855 for (n = 0; n < npath; ++n, ++path) {
1856 /* Copy the procname */
1857 new->procname = path->procname;
1858 new->mode = 0555;
1859
1860 *prevp = new;
1861 prevp = &new->child;
1862
1863 new += 2;
1864 }
1865 *prevp = table;
1866 header->ctl_table_arg = table;
1867
1868 INIT_LIST_HEAD(&header->ctl_entry);
1869 header->used = 0;
1870 header->unregistering = NULL;
1871 header->root = root;
1872 sysctl_set_parent(NULL, header->ctl_table);
1873 header->count = 1;
1874 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1875 if (sysctl_check_table(namespaces, header->ctl_table)) {
1876 kfree(header);
1877 return NULL;
1878 }
1879 #endif
1880 spin_lock(&sysctl_lock);
1881 header->set = lookup_header_set(root, namespaces);
1882 header->attached_by = header->ctl_table;
1883 header->attached_to = root_table;
1884 header->parent = &root_table_header;
1885 for (set = header->set; set; set = set->parent) {
1886 struct ctl_table_header *p;
1887 list_for_each_entry(p, &set->list, ctl_entry) {
1888 if (p->unregistering)
1889 continue;
1890 try_attach(p, header);
1891 }
1892 }
1893 header->parent->count++;
1894 list_add_tail(&header->ctl_entry, &header->set->list);
1895 spin_unlock(&sysctl_lock);
1896
1897 return header;
1898 }
1899
1900 /**
1901 * register_sysctl_table_path - register a sysctl table hierarchy
1902 * @path: The path to the directory the sysctl table is in.
1903 * @table: the top-level table structure
1904 *
1905 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1906 * array. A completely 0 filled entry terminates the table.
1907 *
1908 * See __register_sysctl_paths for more details.
1909 */
1910 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1911 struct ctl_table *table)
1912 {
1913 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1914 path, table);
1915 }
1916
1917 /**
1918 * register_sysctl_table - register a sysctl table hierarchy
1919 * @table: the top-level table structure
1920 *
1921 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1922 * array. A completely 0 filled entry terminates the table.
1923 *
1924 * See register_sysctl_paths for more details.
1925 */
1926 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1927 {
1928 static const struct ctl_path null_path[] = { {} };
1929
1930 return register_sysctl_paths(null_path, table);
1931 }
1932
1933 /**
1934 * unregister_sysctl_table - unregister a sysctl table hierarchy
1935 * @header: the header returned from register_sysctl_table
1936 *
1937 * Unregisters the sysctl table and all children. proc entries may not
1938 * actually be removed until they are no longer used by anyone.
1939 */
1940 void unregister_sysctl_table(struct ctl_table_header * header)
1941 {
1942 might_sleep();
1943
1944 if (header == NULL)
1945 return;
1946
1947 spin_lock(&sysctl_lock);
1948 start_unregistering(header);
1949 if (!--header->parent->count) {
1950 WARN_ON(1);
1951 kfree(header->parent);
1952 }
1953 if (!--header->count)
1954 kfree(header);
1955 spin_unlock(&sysctl_lock);
1956 }
1957
1958 int sysctl_is_seen(struct ctl_table_header *p)
1959 {
1960 struct ctl_table_set *set = p->set;
1961 int res;
1962 spin_lock(&sysctl_lock);
1963 if (p->unregistering)
1964 res = 0;
1965 else if (!set->is_seen)
1966 res = 1;
1967 else
1968 res = set->is_seen(set);
1969 spin_unlock(&sysctl_lock);
1970 return res;
1971 }
1972
1973 void setup_sysctl_set(struct ctl_table_set *p,
1974 struct ctl_table_set *parent,
1975 int (*is_seen)(struct ctl_table_set *))
1976 {
1977 INIT_LIST_HEAD(&p->list);
1978 p->parent = parent ? parent : &sysctl_table_root.default_set;
1979 p->is_seen = is_seen;
1980 }
1981
1982 #else /* !CONFIG_SYSCTL */
1983 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1984 {
1985 return NULL;
1986 }
1987
1988 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1989 struct ctl_table *table)
1990 {
1991 return NULL;
1992 }
1993
1994 void unregister_sysctl_table(struct ctl_table_header * table)
1995 {
1996 }
1997
1998 void setup_sysctl_set(struct ctl_table_set *p,
1999 struct ctl_table_set *parent,
2000 int (*is_seen)(struct ctl_table_set *))
2001 {
2002 }
2003
2004 void sysctl_head_put(struct ctl_table_header *head)
2005 {
2006 }
2007
2008 #endif /* CONFIG_SYSCTL */
2009
2010 /*
2011 * /proc/sys support
2012 */
2013
2014 #ifdef CONFIG_PROC_SYSCTL
2015
2016 static int _proc_do_string(void* data, int maxlen, int write,
2017 void __user *buffer,
2018 size_t *lenp, loff_t *ppos)
2019 {
2020 size_t len;
2021 char __user *p;
2022 char c;
2023
2024 if (!data || !maxlen || !*lenp) {
2025 *lenp = 0;
2026 return 0;
2027 }
2028
2029 if (write) {
2030 len = 0;
2031 p = buffer;
2032 while (len < *lenp) {
2033 if (get_user(c, p++))
2034 return -EFAULT;
2035 if (c == 0 || c == '\n')
2036 break;
2037 len++;
2038 }
2039 if (len >= maxlen)
2040 len = maxlen-1;
2041 if(copy_from_user(data, buffer, len))
2042 return -EFAULT;
2043 ((char *) data)[len] = 0;
2044 *ppos += *lenp;
2045 } else {
2046 len = strlen(data);
2047 if (len > maxlen)
2048 len = maxlen;
2049
2050 if (*ppos > len) {
2051 *lenp = 0;
2052 return 0;
2053 }
2054
2055 data += *ppos;
2056 len -= *ppos;
2057
2058 if (len > *lenp)
2059 len = *lenp;
2060 if (len)
2061 if(copy_to_user(buffer, data, len))
2062 return -EFAULT;
2063 if (len < *lenp) {
2064 if(put_user('\n', ((char __user *) buffer) + len))
2065 return -EFAULT;
2066 len++;
2067 }
2068 *lenp = len;
2069 *ppos += len;
2070 }
2071 return 0;
2072 }
2073
2074 /**
2075 * proc_dostring - read a string sysctl
2076 * @table: the sysctl table
2077 * @write: %TRUE if this is a write to the sysctl file
2078 * @buffer: the user buffer
2079 * @lenp: the size of the user buffer
2080 * @ppos: file position
2081 *
2082 * Reads/writes a string from/to the user buffer. If the kernel
2083 * buffer provided is not large enough to hold the string, the
2084 * string is truncated. The copied string is %NULL-terminated.
2085 * If the string is being read by the user process, it is copied
2086 * and a newline '\n' is added. It is truncated if the buffer is
2087 * not large enough.
2088 *
2089 * Returns 0 on success.
2090 */
2091 int proc_dostring(struct ctl_table *table, int write,
2092 void __user *buffer, size_t *lenp, loff_t *ppos)
2093 {
2094 return _proc_do_string(table->data, table->maxlen, write,
2095 buffer, lenp, ppos);
2096 }
2097
2098 static size_t proc_skip_spaces(char **buf)
2099 {
2100 size_t ret;
2101 char *tmp = skip_spaces(*buf);
2102 ret = tmp - *buf;
2103 *buf = tmp;
2104 return ret;
2105 }
2106
2107 static void proc_skip_char(char **buf, size_t *size, const char v)
2108 {
2109 while (*size) {
2110 if (**buf != v)
2111 break;
2112 (*size)--;
2113 (*buf)++;
2114 }
2115 }
2116
2117 #define TMPBUFLEN 22
2118 /**
2119 * proc_get_long - reads an ASCII formatted integer from a user buffer
2120 *
2121 * @buf: a kernel buffer
2122 * @size: size of the kernel buffer
2123 * @val: this is where the number will be stored
2124 * @neg: set to %TRUE if number is negative
2125 * @perm_tr: a vector which contains the allowed trailers
2126 * @perm_tr_len: size of the perm_tr vector
2127 * @tr: pointer to store the trailer character
2128 *
2129 * In case of success %0 is returned and @buf and @size are updated with
2130 * the amount of bytes read. If @tr is non-NULL and a trailing
2131 * character exists (size is non-zero after returning from this
2132 * function), @tr is updated with the trailing character.
2133 */
2134 static int proc_get_long(char **buf, size_t *size,
2135 unsigned long *val, bool *neg,
2136 const char *perm_tr, unsigned perm_tr_len, char *tr)
2137 {
2138 int len;
2139 char *p, tmp[TMPBUFLEN];
2140
2141 if (!*size)
2142 return -EINVAL;
2143
2144 len = *size;
2145 if (len > TMPBUFLEN - 1)
2146 len = TMPBUFLEN - 1;
2147
2148 memcpy(tmp, *buf, len);
2149
2150 tmp[len] = 0;
2151 p = tmp;
2152 if (*p == '-' && *size > 1) {
2153 *neg = true;
2154 p++;
2155 } else
2156 *neg = false;
2157 if (!isdigit(*p))
2158 return -EINVAL;
2159
2160 *val = simple_strtoul(p, &p, 0);
2161
2162 len = p - tmp;
2163
2164 /* We don't know if the next char is whitespace thus we may accept
2165 * invalid integers (e.g. 1234...a) or two integers instead of one
2166 * (e.g. 123...1). So lets not allow such large numbers. */
2167 if (len == TMPBUFLEN - 1)
2168 return -EINVAL;
2169
2170 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2171 return -EINVAL;
2172
2173 if (tr && (len < *size))
2174 *tr = *p;
2175
2176 *buf += len;
2177 *size -= len;
2178
2179 return 0;
2180 }
2181
2182 /**
2183 * proc_put_long - converts an integer to a decimal ASCII formatted string
2184 *
2185 * @buf: the user buffer
2186 * @size: the size of the user buffer
2187 * @val: the integer to be converted
2188 * @neg: sign of the number, %TRUE for negative
2189 *
2190 * In case of success %0 is returned and @buf and @size are updated with
2191 * the amount of bytes written.
2192 */
2193 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2194 bool neg)
2195 {
2196 int len;
2197 char tmp[TMPBUFLEN], *p = tmp;
2198
2199 sprintf(p, "%s%lu", neg ? "-" : "", val);
2200 len = strlen(tmp);
2201 if (len > *size)
2202 len = *size;
2203 if (copy_to_user(*buf, tmp, len))
2204 return -EFAULT;
2205 *size -= len;
2206 *buf += len;
2207 return 0;
2208 }
2209 #undef TMPBUFLEN
2210
2211 static int proc_put_char(void __user **buf, size_t *size, char c)
2212 {
2213 if (*size) {
2214 char __user **buffer = (char __user **)buf;
2215 if (put_user(c, *buffer))
2216 return -EFAULT;
2217 (*size)--, (*buffer)++;
2218 *buf = *buffer;
2219 }
2220 return 0;
2221 }
2222
2223 static int do_proc_dointvec_conv(bool *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 = true;
2233 *lvalp = (unsigned long)-val;
2234 } else {
2235 *negp = false;
2236 *lvalp = (unsigned long)val;
2237 }
2238 }
2239 return 0;
2240 }
2241
2242 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2243
2244 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2245 int write, void __user *buffer,
2246 size_t *lenp, loff_t *ppos,
2247 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2248 int write, void *data),
2249 void *data)
2250 {
2251 int *i, vleft, first = 1, err = 0;
2252 unsigned long page = 0;
2253 size_t left;
2254 char *kbuf;
2255
2256 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2257 *lenp = 0;
2258 return 0;
2259 }
2260
2261 i = (int *) tbl_data;
2262 vleft = table->maxlen / sizeof(*i);
2263 left = *lenp;
2264
2265 if (!conv)
2266 conv = do_proc_dointvec_conv;
2267
2268 if (write) {
2269 if (left > PAGE_SIZE - 1)
2270 left = PAGE_SIZE - 1;
2271 page = __get_free_page(GFP_TEMPORARY);
2272 kbuf = (char *) page;
2273 if (!kbuf)
2274 return -ENOMEM;
2275 if (copy_from_user(kbuf, buffer, left)) {
2276 err = -EFAULT;
2277 goto free;
2278 }
2279 kbuf[left] = 0;
2280 }
2281
2282 for (; left && vleft--; i++, first=0) {
2283 unsigned long lval;
2284 bool neg;
2285
2286 if (write) {
2287 left -= proc_skip_spaces(&kbuf);
2288
2289 if (!left)
2290 break;
2291 err = proc_get_long(&kbuf, &left, &lval, &neg,
2292 proc_wspace_sep,
2293 sizeof(proc_wspace_sep), NULL);
2294 if (err)
2295 break;
2296 if (conv(&neg, &lval, i, 1, data)) {
2297 err = -EINVAL;
2298 break;
2299 }
2300 } else {
2301 if (conv(&neg, &lval, i, 0, data)) {
2302 err = -EINVAL;
2303 break;
2304 }
2305 if (!first)
2306 err = proc_put_char(&buffer, &left, '\t');
2307 if (err)
2308 break;
2309 err = proc_put_long(&buffer, &left, lval, neg);
2310 if (err)
2311 break;
2312 }
2313 }
2314
2315 if (!write && !first && left && !err)
2316 err = proc_put_char(&buffer, &left, '\n');
2317 if (write && !err && left)
2318 left -= proc_skip_spaces(&kbuf);
2319 free:
2320 if (write) {
2321 free_page(page);
2322 if (first)
2323 return err ? : -EINVAL;
2324 }
2325 *lenp -= left;
2326 *ppos += *lenp;
2327 return err;
2328 }
2329
2330 static int do_proc_dointvec(struct ctl_table *table, int write,
2331 void __user *buffer, size_t *lenp, loff_t *ppos,
2332 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2333 int write, void *data),
2334 void *data)
2335 {
2336 return __do_proc_dointvec(table->data, table, write,
2337 buffer, lenp, ppos, conv, data);
2338 }
2339
2340 /**
2341 * proc_dointvec - read a vector of integers
2342 * @table: the sysctl table
2343 * @write: %TRUE if this is a write to the sysctl file
2344 * @buffer: the user buffer
2345 * @lenp: the size of the user buffer
2346 * @ppos: file position
2347 *
2348 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2349 * values from/to the user buffer, treated as an ASCII string.
2350 *
2351 * Returns 0 on success.
2352 */
2353 int proc_dointvec(struct ctl_table *table, int write,
2354 void __user *buffer, size_t *lenp, loff_t *ppos)
2355 {
2356 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2357 NULL,NULL);
2358 }
2359
2360 /*
2361 * Taint values can only be increased
2362 * This means we can safely use a temporary.
2363 */
2364 static int proc_taint(struct ctl_table *table, int write,
2365 void __user *buffer, size_t *lenp, loff_t *ppos)
2366 {
2367 struct ctl_table t;
2368 unsigned long tmptaint = get_taint();
2369 int err;
2370
2371 if (write && !capable(CAP_SYS_ADMIN))
2372 return -EPERM;
2373
2374 t = *table;
2375 t.data = &tmptaint;
2376 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2377 if (err < 0)
2378 return err;
2379
2380 if (write) {
2381 /*
2382 * Poor man's atomic or. Not worth adding a primitive
2383 * to everyone's atomic.h for this
2384 */
2385 int i;
2386 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2387 if ((tmptaint >> i) & 1)
2388 add_taint(i);
2389 }
2390 }
2391
2392 return err;
2393 }
2394
2395 struct do_proc_dointvec_minmax_conv_param {
2396 int *min;
2397 int *max;
2398 };
2399
2400 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2401 int *valp,
2402 int write, void *data)
2403 {
2404 struct do_proc_dointvec_minmax_conv_param *param = data;
2405 if (write) {
2406 int val = *negp ? -*lvalp : *lvalp;
2407 if ((param->min && *param->min > val) ||
2408 (param->max && *param->max < val))
2409 return -EINVAL;
2410 *valp = val;
2411 } else {
2412 int val = *valp;
2413 if (val < 0) {
2414 *negp = true;
2415 *lvalp = (unsigned long)-val;
2416 } else {
2417 *negp = false;
2418 *lvalp = (unsigned long)val;
2419 }
2420 }
2421 return 0;
2422 }
2423
2424 /**
2425 * proc_dointvec_minmax - read a vector of integers with min/max values
2426 * @table: the sysctl table
2427 * @write: %TRUE if this is a write to the sysctl file
2428 * @buffer: the user buffer
2429 * @lenp: the size of the user buffer
2430 * @ppos: file position
2431 *
2432 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2433 * values from/to the user buffer, treated as an ASCII string.
2434 *
2435 * This routine will ensure the values are within the range specified by
2436 * table->extra1 (min) and table->extra2 (max).
2437 *
2438 * Returns 0 on success.
2439 */
2440 int proc_dointvec_minmax(struct ctl_table *table, int write,
2441 void __user *buffer, size_t *lenp, loff_t *ppos)
2442 {
2443 struct do_proc_dointvec_minmax_conv_param param = {
2444 .min = (int *) table->extra1,
2445 .max = (int *) table->extra2,
2446 };
2447 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2448 do_proc_dointvec_minmax_conv, &param);
2449 }
2450
2451 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2452 void __user *buffer,
2453 size_t *lenp, loff_t *ppos,
2454 unsigned long convmul,
2455 unsigned long convdiv)
2456 {
2457 unsigned long *i, *min, *max;
2458 int vleft, first = 1, err = 0;
2459 unsigned long page = 0;
2460 size_t left;
2461 char *kbuf;
2462
2463 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2464 *lenp = 0;
2465 return 0;
2466 }
2467
2468 i = (unsigned long *) data;
2469 min = (unsigned long *) table->extra1;
2470 max = (unsigned long *) table->extra2;
2471 vleft = table->maxlen / sizeof(unsigned long);
2472 left = *lenp;
2473
2474 if (write) {
2475 if (left > PAGE_SIZE - 1)
2476 left = PAGE_SIZE - 1;
2477 page = __get_free_page(GFP_TEMPORARY);
2478 kbuf = (char *) page;
2479 if (!kbuf)
2480 return -ENOMEM;
2481 if (copy_from_user(kbuf, buffer, left)) {
2482 err = -EFAULT;
2483 goto free;
2484 }
2485 kbuf[left] = 0;
2486 }
2487
2488 for (; left && vleft--; i++, first = 0) {
2489 unsigned long val;
2490
2491 if (write) {
2492 bool neg;
2493
2494 left -= proc_skip_spaces(&kbuf);
2495
2496 err = proc_get_long(&kbuf, &left, &val, &neg,
2497 proc_wspace_sep,
2498 sizeof(proc_wspace_sep), NULL);
2499 if (err)
2500 break;
2501 if (neg)
2502 continue;
2503 if ((min && val < *min) || (max && val > *max))
2504 continue;
2505 *i = val;
2506 } else {
2507 val = convdiv * (*i) / convmul;
2508 if (!first)
2509 err = proc_put_char(&buffer, &left, '\t');
2510 err = proc_put_long(&buffer, &left, val, false);
2511 if (err)
2512 break;
2513 }
2514 }
2515
2516 if (!write && !first && left && !err)
2517 err = proc_put_char(&buffer, &left, '\n');
2518 if (write && !err)
2519 left -= proc_skip_spaces(&kbuf);
2520 free:
2521 if (write) {
2522 free_page(page);
2523 if (first)
2524 return err ? : -EINVAL;
2525 }
2526 *lenp -= left;
2527 *ppos += *lenp;
2528 return err;
2529 }
2530
2531 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2532 void __user *buffer,
2533 size_t *lenp, loff_t *ppos,
2534 unsigned long convmul,
2535 unsigned long convdiv)
2536 {
2537 return __do_proc_doulongvec_minmax(table->data, table, write,
2538 buffer, lenp, ppos, convmul, convdiv);
2539 }
2540
2541 /**
2542 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2543 * @table: the sysctl table
2544 * @write: %TRUE if this is a write to the sysctl file
2545 * @buffer: the user buffer
2546 * @lenp: the size of the user buffer
2547 * @ppos: file position
2548 *
2549 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2550 * values from/to the user buffer, treated as an ASCII string.
2551 *
2552 * This routine will ensure the values are within the range specified by
2553 * table->extra1 (min) and table->extra2 (max).
2554 *
2555 * Returns 0 on success.
2556 */
2557 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2558 void __user *buffer, size_t *lenp, loff_t *ppos)
2559 {
2560 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2561 }
2562
2563 /**
2564 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2565 * @table: the sysctl table
2566 * @write: %TRUE if this is a write to the sysctl file
2567 * @buffer: the user buffer
2568 * @lenp: the size of the user buffer
2569 * @ppos: file position
2570 *
2571 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2572 * values from/to the user buffer, treated as an ASCII string. The values
2573 * are treated as milliseconds, and converted to jiffies when they are stored.
2574 *
2575 * This routine will ensure the values are within the range specified by
2576 * table->extra1 (min) and table->extra2 (max).
2577 *
2578 * Returns 0 on success.
2579 */
2580 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2581 void __user *buffer,
2582 size_t *lenp, loff_t *ppos)
2583 {
2584 return do_proc_doulongvec_minmax(table, write, buffer,
2585 lenp, ppos, HZ, 1000l);
2586 }
2587
2588
2589 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2590 int *valp,
2591 int write, void *data)
2592 {
2593 if (write) {
2594 if (*lvalp > LONG_MAX / HZ)
2595 return 1;
2596 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2597 } else {
2598 int val = *valp;
2599 unsigned long lval;
2600 if (val < 0) {
2601 *negp = true;
2602 lval = (unsigned long)-val;
2603 } else {
2604 *negp = false;
2605 lval = (unsigned long)val;
2606 }
2607 *lvalp = lval / HZ;
2608 }
2609 return 0;
2610 }
2611
2612 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2613 int *valp,
2614 int write, void *data)
2615 {
2616 if (write) {
2617 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2618 return 1;
2619 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2620 } else {
2621 int val = *valp;
2622 unsigned long lval;
2623 if (val < 0) {
2624 *negp = true;
2625 lval = (unsigned long)-val;
2626 } else {
2627 *negp = false;
2628 lval = (unsigned long)val;
2629 }
2630 *lvalp = jiffies_to_clock_t(lval);
2631 }
2632 return 0;
2633 }
2634
2635 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2636 int *valp,
2637 int write, void *data)
2638 {
2639 if (write) {
2640 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2641 } else {
2642 int val = *valp;
2643 unsigned long lval;
2644 if (val < 0) {
2645 *negp = true;
2646 lval = (unsigned long)-val;
2647 } else {
2648 *negp = false;
2649 lval = (unsigned long)val;
2650 }
2651 *lvalp = jiffies_to_msecs(lval);
2652 }
2653 return 0;
2654 }
2655
2656 /**
2657 * proc_dointvec_jiffies - read a vector of integers as seconds
2658 * @table: the sysctl table
2659 * @write: %TRUE if this is a write to the sysctl file
2660 * @buffer: the user buffer
2661 * @lenp: the size of the user buffer
2662 * @ppos: file position
2663 *
2664 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2665 * values from/to the user buffer, treated as an ASCII string.
2666 * The values read are assumed to be in seconds, and are converted into
2667 * jiffies.
2668 *
2669 * Returns 0 on success.
2670 */
2671 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2672 void __user *buffer, size_t *lenp, loff_t *ppos)
2673 {
2674 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2675 do_proc_dointvec_jiffies_conv,NULL);
2676 }
2677
2678 /**
2679 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2680 * @table: the sysctl table
2681 * @write: %TRUE if this is a write to the sysctl file
2682 * @buffer: the user buffer
2683 * @lenp: the size of the user buffer
2684 * @ppos: pointer to the file position
2685 *
2686 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2687 * values from/to the user buffer, treated as an ASCII string.
2688 * The values read are assumed to be in 1/USER_HZ seconds, and
2689 * are converted into jiffies.
2690 *
2691 * Returns 0 on success.
2692 */
2693 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2694 void __user *buffer, size_t *lenp, loff_t *ppos)
2695 {
2696 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2697 do_proc_dointvec_userhz_jiffies_conv,NULL);
2698 }
2699
2700 /**
2701 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2702 * @table: the sysctl table
2703 * @write: %TRUE if this is a write to the sysctl file
2704 * @buffer: the user buffer
2705 * @lenp: the size of the user buffer
2706 * @ppos: file position
2707 * @ppos: the current position in the file
2708 *
2709 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2710 * values from/to the user buffer, treated as an ASCII string.
2711 * The values read are assumed to be in 1/1000 seconds, and
2712 * are converted into jiffies.
2713 *
2714 * Returns 0 on success.
2715 */
2716 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2717 void __user *buffer, size_t *lenp, loff_t *ppos)
2718 {
2719 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2720 do_proc_dointvec_ms_jiffies_conv, NULL);
2721 }
2722
2723 static int proc_do_cad_pid(struct ctl_table *table, int write,
2724 void __user *buffer, size_t *lenp, loff_t *ppos)
2725 {
2726 struct pid *new_pid;
2727 pid_t tmp;
2728 int r;
2729
2730 tmp = pid_vnr(cad_pid);
2731
2732 r = __do_proc_dointvec(&tmp, table, write, buffer,
2733 lenp, ppos, NULL, NULL);
2734 if (r || !write)
2735 return r;
2736
2737 new_pid = find_get_pid(tmp);
2738 if (!new_pid)
2739 return -ESRCH;
2740
2741 put_pid(xchg(&cad_pid, new_pid));
2742 return 0;
2743 }
2744
2745 /**
2746 * proc_do_large_bitmap - read/write from/to a large bitmap
2747 * @table: the sysctl table
2748 * @write: %TRUE if this is a write to the sysctl file
2749 * @buffer: the user buffer
2750 * @lenp: the size of the user buffer
2751 * @ppos: file position
2752 *
2753 * The bitmap is stored at table->data and the bitmap length (in bits)
2754 * in table->maxlen.
2755 *
2756 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2757 * large bitmaps may be represented in a compact manner. Writing into
2758 * the file will clear the bitmap then update it with the given input.
2759 *
2760 * Returns 0 on success.
2761 */
2762 int proc_do_large_bitmap(struct ctl_table *table, int write,
2763 void __user *buffer, size_t *lenp, loff_t *ppos)
2764 {
2765 int err = 0;
2766 bool first = 1;
2767 size_t left = *lenp;
2768 unsigned long bitmap_len = table->maxlen;
2769 unsigned long *bitmap = (unsigned long *) table->data;
2770 unsigned long *tmp_bitmap = NULL;
2771 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2772
2773 if (!bitmap_len || !left || (*ppos && !write)) {
2774 *lenp = 0;
2775 return 0;
2776 }
2777
2778 if (write) {
2779 unsigned long page = 0;
2780 char *kbuf;
2781
2782 if (left > PAGE_SIZE - 1)
2783 left = PAGE_SIZE - 1;
2784
2785 page = __get_free_page(GFP_TEMPORARY);
2786 kbuf = (char *) page;
2787 if (!kbuf)
2788 return -ENOMEM;
2789 if (copy_from_user(kbuf, buffer, left)) {
2790 free_page(page);
2791 return -EFAULT;
2792 }
2793 kbuf[left] = 0;
2794
2795 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2796 GFP_KERNEL);
2797 if (!tmp_bitmap) {
2798 free_page(page);
2799 return -ENOMEM;
2800 }
2801 proc_skip_char(&kbuf, &left, '\n');
2802 while (!err && left) {
2803 unsigned long val_a, val_b;
2804 bool neg;
2805
2806 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2807 sizeof(tr_a), &c);
2808 if (err)
2809 break;
2810 if (val_a >= bitmap_len || neg) {
2811 err = -EINVAL;
2812 break;
2813 }
2814
2815 val_b = val_a;
2816 if (left) {
2817 kbuf++;
2818 left--;
2819 }
2820
2821 if (c == '-') {
2822 err = proc_get_long(&kbuf, &left, &val_b,
2823 &neg, tr_b, sizeof(tr_b),
2824 &c);
2825 if (err)
2826 break;
2827 if (val_b >= bitmap_len || neg ||
2828 val_a > val_b) {
2829 err = -EINVAL;
2830 break;
2831 }
2832 if (left) {
2833 kbuf++;
2834 left--;
2835 }
2836 }
2837
2838 while (val_a <= val_b)
2839 set_bit(val_a++, tmp_bitmap);
2840
2841 first = 0;
2842 proc_skip_char(&kbuf, &left, '\n');
2843 }
2844 free_page(page);
2845 } else {
2846 unsigned long bit_a, bit_b = 0;
2847
2848 while (left) {
2849 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2850 if (bit_a >= bitmap_len)
2851 break;
2852 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2853 bit_a + 1) - 1;
2854
2855 if (!first) {
2856 err = proc_put_char(&buffer, &left, ',');
2857 if (err)
2858 break;
2859 }
2860 err = proc_put_long(&buffer, &left, bit_a, false);
2861 if (err)
2862 break;
2863 if (bit_a != bit_b) {
2864 err = proc_put_char(&buffer, &left, '-');
2865 if (err)
2866 break;
2867 err = proc_put_long(&buffer, &left, bit_b, false);
2868 if (err)
2869 break;
2870 }
2871
2872 first = 0; bit_b++;
2873 }
2874 if (!err)
2875 err = proc_put_char(&buffer, &left, '\n');
2876 }
2877
2878 if (!err) {
2879 if (write) {
2880 if (*ppos)
2881 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2882 else
2883 memcpy(bitmap, tmp_bitmap,
2884 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2885 }
2886 kfree(tmp_bitmap);
2887 *lenp -= left;
2888 *ppos += *lenp;
2889 return 0;
2890 } else {
2891 kfree(tmp_bitmap);
2892 return err;
2893 }
2894 }
2895
2896 #else /* CONFIG_PROC_SYSCTL */
2897
2898 int proc_dostring(struct ctl_table *table, int write,
2899 void __user *buffer, size_t *lenp, loff_t *ppos)
2900 {
2901 return -ENOSYS;
2902 }
2903
2904 int proc_dointvec(struct ctl_table *table, int write,
2905 void __user *buffer, size_t *lenp, loff_t *ppos)
2906 {
2907 return -ENOSYS;
2908 }
2909
2910 int proc_dointvec_minmax(struct ctl_table *table, int write,
2911 void __user *buffer, size_t *lenp, loff_t *ppos)
2912 {
2913 return -ENOSYS;
2914 }
2915
2916 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2917 void __user *buffer, size_t *lenp, loff_t *ppos)
2918 {
2919 return -ENOSYS;
2920 }
2921
2922 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2923 void __user *buffer, size_t *lenp, loff_t *ppos)
2924 {
2925 return -ENOSYS;
2926 }
2927
2928 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2929 void __user *buffer, size_t *lenp, loff_t *ppos)
2930 {
2931 return -ENOSYS;
2932 }
2933
2934 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2935 void __user *buffer, size_t *lenp, loff_t *ppos)
2936 {
2937 return -ENOSYS;
2938 }
2939
2940 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2941 void __user *buffer,
2942 size_t *lenp, loff_t *ppos)
2943 {
2944 return -ENOSYS;
2945 }
2946
2947
2948 #endif /* CONFIG_PROC_SYSCTL */
2949
2950 /*
2951 * No sense putting this after each symbol definition, twice,
2952 * exception granted :-)
2953 */
2954 EXPORT_SYMBOL(proc_dointvec);
2955 EXPORT_SYMBOL(proc_dointvec_jiffies);
2956 EXPORT_SYMBOL(proc_dointvec_minmax);
2957 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2958 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2959 EXPORT_SYMBOL(proc_dostring);
2960 EXPORT_SYMBOL(proc_doulongvec_minmax);
2961 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2962 EXPORT_SYMBOL(register_sysctl_table);
2963 EXPORT_SYMBOL(register_sysctl_paths);
2964 EXPORT_SYMBOL(unregister_sysctl_table);
WandBoard kernel