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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/proc_fs.h>
28#include <linux/security.h>
29#include <linux/ctype.h>
30#include <linux/kmemcheck.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/ratelimit.h>
40#include <linux/compaction.h>
41#include <linux/hugetlb.h>
42#include <linux/initrd.h>
43#include <linux/key.h>
44#include <linux/times.h>
45#include <linux/limits.h>
46#include <linux/dcache.h>
47#include <linux/dnotify.h>
48#include <linux/syscalls.h>
49#include <linux/vmstat.h>
50#include <linux/nfs_fs.h>
51#include <linux/acpi.h>
52#include <linux/reboot.h>
53#include <linux/ftrace.h>
54#include <linux/slow-work.h>
55#include <linux/perf_event.h>
56#include <linux/kprobes.h>
57#include <linux/pipe_fs_i.h>
58
59#include <asm/uaccess.h>
60#include <asm/processor.h>
61
62#ifdef CONFIG_X86
63#include <asm/nmi.h>
64#include <asm/stacktrace.h>
65#include <asm/io.h>
66#endif
67#ifdef CONFIG_BSD_PROCESS_ACCT
68#include <linux/acct.h>
69#endif
70#ifdef CONFIG_RT_MUTEXES
71#include <linux/rtmutex.h>
72#endif
73#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
74#include <linux/lockdep.h>
75#endif
76#ifdef CONFIG_CHR_DEV_SG
77#include <scsi/sg.h>
78#endif
79
80
81#if defined(CONFIG_SYSCTL)
82
83/* External variables not in a header file. */
84extern int sysctl_overcommit_memory;
85extern int sysctl_overcommit_ratio;
86extern int sysctl_panic_on_oom;
87extern int sysctl_oom_kill_allocating_task;
88extern int sysctl_oom_dump_tasks;
89extern int max_threads;
90extern int core_uses_pid;
91extern int suid_dumpable;
92extern char core_pattern[];
93extern unsigned int core_pipe_limit;
94extern int pid_max;
95extern int min_free_kbytes;
96extern int pid_max_min, pid_max_max;
97extern int sysctl_drop_caches;
98extern int percpu_pagelist_fraction;
99extern int compat_log;
100extern int latencytop_enabled;
101extern int sysctl_nr_open_min, sysctl_nr_open_max;
102#ifndef CONFIG_MMU
103extern int sysctl_nr_trim_pages;
104#endif
105#ifdef CONFIG_BLOCK
106extern int blk_iopoll_enabled;
107#endif
108
109/* Constants used for minimum and maximum */
110#ifdef CONFIG_DETECT_SOFTLOCKUP
111static int sixty = 60;
112static int neg_one = -1;
113#endif
114
115static int zero;
116static int __maybe_unused one = 1;
117static int __maybe_unused two = 2;
118static unsigned long one_ul = 1;
119static int one_hundred = 100;
120#ifdef CONFIG_PRINTK
121static int ten_thousand = 10000;
122#endif
123
124/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
125static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
126
127/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
128static int maxolduid = 65535;
129static int minolduid;
130static int min_percpu_pagelist_fract = 8;
131
132static int ngroups_max = NGROUPS_MAX;
133
134#ifdef CONFIG_SPARC
135#include <asm/system.h>
136#endif
137
138#ifdef CONFIG_SPARC64
139extern int sysctl_tsb_ratio;
140#endif
141
142#ifdef __hppa__
143extern int pwrsw_enabled;
144extern int unaligned_enabled;
145#endif
146
147#ifdef CONFIG_S390
148#ifdef CONFIG_MATHEMU
149extern int sysctl_ieee_emulation_warnings;
150#endif
151extern int sysctl_userprocess_debug;
152extern int spin_retry;
153#endif
154
155#ifdef CONFIG_IA64
156extern int no_unaligned_warning;
157extern int unaligned_dump_stack;
158#endif
159
160extern struct ratelimit_state printk_ratelimit_state;
161
162#ifdef CONFIG_PROC_SYSCTL
163static int proc_do_cad_pid(struct ctl_table *table, int write,
164 void __user *buffer, size_t *lenp, loff_t *ppos);
165static int proc_taint(struct ctl_table *table, int write,
166 void __user *buffer, size_t *lenp, loff_t *ppos);
167#endif
168
169#ifdef CONFIG_MAGIC_SYSRQ
170static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
171
172static int sysrq_sysctl_handler(ctl_table *table, int write,
173 void __user *buffer, size_t *lenp,
174 loff_t *ppos)
175{
176 int error;
177
178 error = proc_dointvec(table, write, buffer, lenp, ppos);
179 if (error)
180 return error;
181
182 if (write)
183 sysrq_toggle_support(__sysrq_enabled);
184
185 return 0;
186}
187
188#endif
189
190static struct ctl_table root_table[];
191static struct ctl_table_root sysctl_table_root;
192static struct ctl_table_header root_table_header = {
193 .count = 1,
194 .ctl_table = root_table,
195 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
196 .root = &sysctl_table_root,
197 .set = &sysctl_table_root.default_set,
198};
199static struct ctl_table_root sysctl_table_root = {
200 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
201 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
202};
203
204static struct ctl_table kern_table[];
205static struct ctl_table vm_table[];
206static struct ctl_table fs_table[];
207static struct ctl_table debug_table[];
208static struct ctl_table dev_table[];
209extern struct ctl_table random_table[];
210#ifdef CONFIG_INOTIFY_USER
211extern struct ctl_table inotify_table[];
212#endif
213#ifdef CONFIG_EPOLL
214extern struct ctl_table epoll_table[];
215#endif
216
217#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
218int sysctl_legacy_va_layout;
219#endif
220
221/* The default sysctl tables: */
222
223static struct ctl_table root_table[] = {
224 {
225 .procname = "kernel",
226 .mode = 0555,
227 .child = kern_table,
228 },
229 {
230 .procname = "vm",
231 .mode = 0555,
232 .child = vm_table,
233 },
234 {
235 .procname = "fs",
236 .mode = 0555,
237 .child = fs_table,
238 },
239 {
240 .procname = "debug",
241 .mode = 0555,
242 .child = debug_table,
243 },
244 {
245 .procname = "dev",
246 .mode = 0555,
247 .child = dev_table,
248 },
249/*
250 * NOTE: do not add new entries to this table unless you have read
251 * Documentation/sysctl/ctl_unnumbered.txt
252 */
253 { }
254};
255
256#ifdef CONFIG_SCHED_DEBUG
257static int min_sched_granularity_ns = 100000; /* 100 usecs */
258static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
259static int min_wakeup_granularity_ns; /* 0 usecs */
260static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
261static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
262static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
263static int min_sched_shares_ratelimit = 100000; /* 100 usec */
264static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
265#endif
266
267#ifdef CONFIG_COMPACTION
268static int min_extfrag_threshold;
269static int max_extfrag_threshold = 1000;
270#endif
271
272static struct ctl_table kern_table[] = {
273 {
274 .procname = "sched_child_runs_first",
275 .data = &sysctl_sched_child_runs_first,
276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
278 .proc_handler = proc_dointvec,
279 },
280#ifdef CONFIG_SCHED_DEBUG
281 {
282 .procname = "sched_min_granularity_ns",
283 .data = &sysctl_sched_min_granularity,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = sched_proc_update_handler,
287 .extra1 = &min_sched_granularity_ns,
288 .extra2 = &max_sched_granularity_ns,
289 },
290 {
291 .procname = "sched_latency_ns",
292 .data = &sysctl_sched_latency,
293 .maxlen = sizeof(unsigned int),
294 .mode = 0644,
295 .proc_handler = sched_proc_update_handler,
296 .extra1 = &min_sched_granularity_ns,
297 .extra2 = &max_sched_granularity_ns,
298 },
299 {
300 .procname = "sched_wakeup_granularity_ns",
301 .data = &sysctl_sched_wakeup_granularity,
302 .maxlen = sizeof(unsigned int),
303 .mode = 0644,
304 .proc_handler = sched_proc_update_handler,
305 .extra1 = &min_wakeup_granularity_ns,
306 .extra2 = &max_wakeup_granularity_ns,
307 },
308 {
309 .procname = "sched_shares_ratelimit",
310 .data = &sysctl_sched_shares_ratelimit,
311 .maxlen = sizeof(unsigned int),
312 .mode = 0644,
313 .proc_handler = sched_proc_update_handler,
314 .extra1 = &min_sched_shares_ratelimit,
315 .extra2 = &max_sched_shares_ratelimit,
316 },
317 {
318 .procname = "sched_tunable_scaling",
319 .data = &sysctl_sched_tunable_scaling,
320 .maxlen = sizeof(enum sched_tunable_scaling),
321 .mode = 0644,
322 .proc_handler = sched_proc_update_handler,
323 .extra1 = &min_sched_tunable_scaling,
324 .extra2 = &max_sched_tunable_scaling,
325 },
326 {
327 .procname = "sched_shares_thresh",
328 .data = &sysctl_sched_shares_thresh,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec_minmax,
332 .extra1 = &zero,
333 },
334 {
335 .procname = "sched_migration_cost",
336 .data = &sysctl_sched_migration_cost,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
339 .proc_handler = proc_dointvec,
340 },
341 {
342 .procname = "sched_nr_migrate",
343 .data = &sysctl_sched_nr_migrate,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = proc_dointvec,
347 },
348 {
349 .procname = "sched_time_avg",
350 .data = &sysctl_sched_time_avg,
351 .maxlen = sizeof(unsigned int),
352 .mode = 0644,
353 .proc_handler = proc_dointvec,
354 },
355 {
356 .procname = "timer_migration",
357 .data = &sysctl_timer_migration,
358 .maxlen = sizeof(unsigned int),
359 .mode = 0644,
360 .proc_handler = proc_dointvec_minmax,
361 .extra1 = &zero,
362 .extra2 = &one,
363 },
364#endif
365 {
366 .procname = "sched_rt_period_us",
367 .data = &sysctl_sched_rt_period,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
370 .proc_handler = sched_rt_handler,
371 },
372 {
373 .procname = "sched_rt_runtime_us",
374 .data = &sysctl_sched_rt_runtime,
375 .maxlen = sizeof(int),
376 .mode = 0644,
377 .proc_handler = sched_rt_handler,
378 },
379 {
380 .procname = "sched_compat_yield",
381 .data = &sysctl_sched_compat_yield,
382 .maxlen = sizeof(unsigned int),
383 .mode = 0644,
384 .proc_handler = proc_dointvec,
385 },
386#ifdef CONFIG_PROVE_LOCKING
387 {
388 .procname = "prove_locking",
389 .data = &prove_locking,
390 .maxlen = sizeof(int),
391 .mode = 0644,
392 .proc_handler = proc_dointvec,
393 },
394#endif
395#ifdef CONFIG_LOCK_STAT
396 {
397 .procname = "lock_stat",
398 .data = &lock_stat,
399 .maxlen = sizeof(int),
400 .mode = 0644,
401 .proc_handler = proc_dointvec,
402 },
403#endif
404 {
405 .procname = "panic",
406 .data = &panic_timeout,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = proc_dointvec,
410 },
411 {
412 .procname = "core_uses_pid",
413 .data = &core_uses_pid,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = proc_dointvec,
417 },
418 {
419 .procname = "core_pattern",
420 .data = core_pattern,
421 .maxlen = CORENAME_MAX_SIZE,
422 .mode = 0644,
423 .proc_handler = proc_dostring,
424 },
425 {
426 .procname = "core_pipe_limit",
427 .data = &core_pipe_limit,
428 .maxlen = sizeof(unsigned int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec,
431 },
432#ifdef CONFIG_PROC_SYSCTL
433 {
434 .procname = "tainted",
435 .maxlen = sizeof(long),
436 .mode = 0644,
437 .proc_handler = proc_taint,
438 },
439#endif
440#ifdef CONFIG_LATENCYTOP
441 {
442 .procname = "latencytop",
443 .data = &latencytop_enabled,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = proc_dointvec,
447 },
448#endif
449#ifdef CONFIG_BLK_DEV_INITRD
450 {
451 .procname = "real-root-dev",
452 .data = &real_root_dev,
453 .maxlen = sizeof(int),
454 .mode = 0644,
455 .proc_handler = proc_dointvec,
456 },
457#endif
458 {
459 .procname = "print-fatal-signals",
460 .data = &print_fatal_signals,
461 .maxlen = sizeof(int),
462 .mode = 0644,
463 .proc_handler = proc_dointvec,
464 },
465#ifdef CONFIG_SPARC
466 {
467 .procname = "reboot-cmd",
468 .data = reboot_command,
469 .maxlen = 256,
470 .mode = 0644,
471 .proc_handler = proc_dostring,
472 },
473 {
474 .procname = "stop-a",
475 .data = &stop_a_enabled,
476 .maxlen = sizeof (int),
477 .mode = 0644,
478 .proc_handler = proc_dointvec,
479 },
480 {
481 .procname = "scons-poweroff",
482 .data = &scons_pwroff,
483 .maxlen = sizeof (int),
484 .mode = 0644,
485 .proc_handler = proc_dointvec,
486 },
487#endif
488#ifdef CONFIG_SPARC64
489 {
490 .procname = "tsb-ratio",
491 .data = &sysctl_tsb_ratio,
492 .maxlen = sizeof (int),
493 .mode = 0644,
494 .proc_handler = proc_dointvec,
495 },
496#endif
497#ifdef __hppa__
498 {
499 .procname = "soft-power",
500 .data = &pwrsw_enabled,
501 .maxlen = sizeof (int),
502 .mode = 0644,
503 .proc_handler = proc_dointvec,
504 },
505 {
506 .procname = "unaligned-trap",
507 .data = &unaligned_enabled,
508 .maxlen = sizeof (int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec,
511 },
512#endif
513 {
514 .procname = "ctrl-alt-del",
515 .data = &C_A_D,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec,
519 },
520#ifdef CONFIG_FUNCTION_TRACER
521 {
522 .procname = "ftrace_enabled",
523 .data = &ftrace_enabled,
524 .maxlen = sizeof(int),
525 .mode = 0644,
526 .proc_handler = ftrace_enable_sysctl,
527 },
528#endif
529#ifdef CONFIG_STACK_TRACER
530 {
531 .procname = "stack_tracer_enabled",
532 .data = &stack_tracer_enabled,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = stack_trace_sysctl,
536 },
537#endif
538#ifdef CONFIG_TRACING
539 {
540 .procname = "ftrace_dump_on_oops",
541 .data = &ftrace_dump_on_oops,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec,
545 },
546#endif
547#ifdef CONFIG_MODULES
548 {
549 .procname = "modprobe",
550 .data = &modprobe_path,
551 .maxlen = KMOD_PATH_LEN,
552 .mode = 0644,
553 .proc_handler = proc_dostring,
554 },
555 {
556 .procname = "modules_disabled",
557 .data = &modules_disabled,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 /* only handle a transition from default "0" to "1" */
561 .proc_handler = proc_dointvec_minmax,
562 .extra1 = &one,
563 .extra2 = &one,
564 },
565#endif
566#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
567 {
568 .procname = "hotplug",
569 .data = &uevent_helper,
570 .maxlen = UEVENT_HELPER_PATH_LEN,
571 .mode = 0644,
572 .proc_handler = proc_dostring,
573 },
574#endif
575#ifdef CONFIG_CHR_DEV_SG
576 {
577 .procname = "sg-big-buff",
578 .data = &sg_big_buff,
579 .maxlen = sizeof (int),
580 .mode = 0444,
581 .proc_handler = proc_dointvec,
582 },
583#endif
584#ifdef CONFIG_BSD_PROCESS_ACCT
585 {
586 .procname = "acct",
587 .data = &acct_parm,
588 .maxlen = 3*sizeof(int),
589 .mode = 0644,
590 .proc_handler = proc_dointvec,
591 },
592#endif
593#ifdef CONFIG_MAGIC_SYSRQ
594 {
595 .procname = "sysrq",
596 .data = &__sysrq_enabled,
597 .maxlen = sizeof (int),
598 .mode = 0644,
599 .proc_handler = sysrq_sysctl_handler,
600 },
601#endif
602#ifdef CONFIG_PROC_SYSCTL
603 {
604 .procname = "cad_pid",
605 .data = NULL,
606 .maxlen = sizeof (int),
607 .mode = 0600,
608 .proc_handler = proc_do_cad_pid,
609 },
610#endif
611 {
612 .procname = "threads-max",
613 .data = &max_threads,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 .proc_handler = proc_dointvec,
617 },
618 {
619 .procname = "random",
620 .mode = 0555,
621 .child = random_table,
622 },
623 {
624 .procname = "overflowuid",
625 .data = &overflowuid,
626 .maxlen = sizeof(int),
627 .mode = 0644,
628 .proc_handler = proc_dointvec_minmax,
629 .extra1 = &minolduid,
630 .extra2 = &maxolduid,
631 },
632 {
633 .procname = "overflowgid",
634 .data = &overflowgid,
635 .maxlen = sizeof(int),
636 .mode = 0644,
637 .proc_handler = proc_dointvec_minmax,
638 .extra1 = &minolduid,
639 .extra2 = &maxolduid,
640 },
641#ifdef CONFIG_S390
642#ifdef CONFIG_MATHEMU
643 {
644 .procname = "ieee_emulation_warnings",
645 .data = &sysctl_ieee_emulation_warnings,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec,
649 },
650#endif
651 {
652 .procname = "userprocess_debug",
653 .data = &show_unhandled_signals,
654 .maxlen = sizeof(int),
655 .mode = 0644,
656 .proc_handler = proc_dointvec,
657 },
658#endif
659 {
660 .procname = "pid_max",
661 .data = &pid_max,
662 .maxlen = sizeof (int),
663 .mode = 0644,
664 .proc_handler = proc_dointvec_minmax,
665 .extra1 = &pid_max_min,
666 .extra2 = &pid_max_max,
667 },
668 {
669 .procname = "panic_on_oops",
670 .data = &panic_on_oops,
671 .maxlen = sizeof(int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec,
674 },
675#if defined CONFIG_PRINTK
676 {
677 .procname = "printk",
678 .data = &console_loglevel,
679 .maxlen = 4*sizeof(int),
680 .mode = 0644,
681 .proc_handler = proc_dointvec,
682 },
683 {
684 .procname = "printk_ratelimit",
685 .data = &printk_ratelimit_state.interval,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec_jiffies,
689 },
690 {
691 .procname = "printk_ratelimit_burst",
692 .data = &printk_ratelimit_state.burst,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec,
696 },
697 {
698 .procname = "printk_delay",
699 .data = &printk_delay_msec,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 .proc_handler = proc_dointvec_minmax,
703 .extra1 = &zero,
704 .extra2 = &ten_thousand,
705 },
706#endif
707 {
708 .procname = "ngroups_max",
709 .data = &ngroups_max,
710 .maxlen = sizeof (int),
711 .mode = 0444,
712 .proc_handler = proc_dointvec,
713 },
714#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
715 {
716 .procname = "unknown_nmi_panic",
717 .data = &unknown_nmi_panic,
718 .maxlen = sizeof (int),
719 .mode = 0644,
720 .proc_handler = proc_dointvec,
721 },
722 {
723 .procname = "nmi_watchdog",
724 .data = &nmi_watchdog_enabled,
725 .maxlen = sizeof (int),
726 .mode = 0644,
727 .proc_handler = proc_nmi_enabled,
728 },
729#endif
730#if defined(CONFIG_X86)
731 {
732 .procname = "panic_on_unrecovered_nmi",
733 .data = &panic_on_unrecovered_nmi,
734 .maxlen = sizeof(int),
735 .mode = 0644,
736 .proc_handler = proc_dointvec,
737 },
738 {
739 .procname = "panic_on_io_nmi",
740 .data = &panic_on_io_nmi,
741 .maxlen = sizeof(int),
742 .mode = 0644,
743 .proc_handler = proc_dointvec,
744 },
745 {
746 .procname = "bootloader_type",
747 .data = &bootloader_type,
748 .maxlen = sizeof (int),
749 .mode = 0444,
750 .proc_handler = proc_dointvec,
751 },
752 {
753 .procname = "bootloader_version",
754 .data = &bootloader_version,
755 .maxlen = sizeof (int),
756 .mode = 0444,
757 .proc_handler = proc_dointvec,
758 },
759 {
760 .procname = "kstack_depth_to_print",
761 .data = &kstack_depth_to_print,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec,
765 },
766 {
767 .procname = "io_delay_type",
768 .data = &io_delay_type,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec,
772 },
773#endif
774#if defined(CONFIG_MMU)
775 {
776 .procname = "randomize_va_space",
777 .data = &randomize_va_space,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec,
781 },
782#endif
783#if defined(CONFIG_S390) && defined(CONFIG_SMP)
784 {
785 .procname = "spin_retry",
786 .data = &spin_retry,
787 .maxlen = sizeof (int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec,
790 },
791#endif
792#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
793 {
794 .procname = "acpi_video_flags",
795 .data = &acpi_realmode_flags,
796 .maxlen = sizeof (unsigned long),
797 .mode = 0644,
798 .proc_handler = proc_doulongvec_minmax,
799 },
800#endif
801#ifdef CONFIG_IA64
802 {
803 .procname = "ignore-unaligned-usertrap",
804 .data = &no_unaligned_warning,
805 .maxlen = sizeof (int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec,
808 },
809 {
810 .procname = "unaligned-dump-stack",
811 .data = &unaligned_dump_stack,
812 .maxlen = sizeof (int),
813 .mode = 0644,
814 .proc_handler = proc_dointvec,
815 },
816#endif
817#ifdef CONFIG_DETECT_SOFTLOCKUP
818 {
819 .procname = "softlockup_panic",
820 .data = &softlockup_panic,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec_minmax,
824 .extra1 = &zero,
825 .extra2 = &one,
826 },
827 {
828 .procname = "softlockup_thresh",
829 .data = &softlockup_thresh,
830 .maxlen = sizeof(int),
831 .mode = 0644,
832 .proc_handler = proc_dosoftlockup_thresh,
833 .extra1 = &neg_one,
834 .extra2 = &sixty,
835 },
836#endif
837#ifdef CONFIG_DETECT_HUNG_TASK
838 {
839 .procname = "hung_task_panic",
840 .data = &sysctl_hung_task_panic,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = proc_dointvec_minmax,
844 .extra1 = &zero,
845 .extra2 = &one,
846 },
847 {
848 .procname = "hung_task_check_count",
849 .data = &sysctl_hung_task_check_count,
850 .maxlen = sizeof(unsigned long),
851 .mode = 0644,
852 .proc_handler = proc_doulongvec_minmax,
853 },
854 {
855 .procname = "hung_task_timeout_secs",
856 .data = &sysctl_hung_task_timeout_secs,
857 .maxlen = sizeof(unsigned long),
858 .mode = 0644,
859 .proc_handler = proc_dohung_task_timeout_secs,
860 },
861 {
862 .procname = "hung_task_warnings",
863 .data = &sysctl_hung_task_warnings,
864 .maxlen = sizeof(unsigned long),
865 .mode = 0644,
866 .proc_handler = proc_doulongvec_minmax,
867 },
868#endif
869#ifdef CONFIG_COMPAT
870 {
871 .procname = "compat-log",
872 .data = &compat_log,
873 .maxlen = sizeof (int),
874 .mode = 0644,
875 .proc_handler = proc_dointvec,
876 },
877#endif
878#ifdef CONFIG_RT_MUTEXES
879 {
880 .procname = "max_lock_depth",
881 .data = &max_lock_depth,
882 .maxlen = sizeof(int),
883 .mode = 0644,
884 .proc_handler = proc_dointvec,
885 },
886#endif
887 {
888 .procname = "poweroff_cmd",
889 .data = &poweroff_cmd,
890 .maxlen = POWEROFF_CMD_PATH_LEN,
891 .mode = 0644,
892 .proc_handler = proc_dostring,
893 },
894#ifdef CONFIG_KEYS
895 {
896 .procname = "keys",
897 .mode = 0555,
898 .child = key_sysctls,
899 },
900#endif
901#ifdef CONFIG_RCU_TORTURE_TEST
902 {
903 .procname = "rcutorture_runnable",
904 .data = &rcutorture_runnable,
905 .maxlen = sizeof(int),
906 .mode = 0644,
907 .proc_handler = proc_dointvec,
908 },
909#endif
910#ifdef CONFIG_SLOW_WORK
911 {
912 .procname = "slow-work",
913 .mode = 0555,
914 .child = slow_work_sysctls,
915 },
916#endif
917#ifdef CONFIG_PERF_EVENTS
918 {
919 .procname = "perf_event_paranoid",
920 .data = &sysctl_perf_event_paranoid,
921 .maxlen = sizeof(sysctl_perf_event_paranoid),
922 .mode = 0644,
923 .proc_handler = proc_dointvec,
924 },
925 {
926 .procname = "perf_event_mlock_kb",
927 .data = &sysctl_perf_event_mlock,
928 .maxlen = sizeof(sysctl_perf_event_mlock),
929 .mode = 0644,
930 .proc_handler = proc_dointvec,
931 },
932 {
933 .procname = "perf_event_max_sample_rate",
934 .data = &sysctl_perf_event_sample_rate,
935 .maxlen = sizeof(sysctl_perf_event_sample_rate),
936 .mode = 0644,
937 .proc_handler = proc_dointvec,
938 },
939#endif
940#ifdef CONFIG_KMEMCHECK
941 {
942 .procname = "kmemcheck",
943 .data = &kmemcheck_enabled,
944 .maxlen = sizeof(int),
945 .mode = 0644,
946 .proc_handler = proc_dointvec,
947 },
948#endif
949#ifdef CONFIG_BLOCK
950 {
951 .procname = "blk_iopoll",
952 .data = &blk_iopoll_enabled,
953 .maxlen = sizeof(int),
954 .mode = 0644,
955 .proc_handler = proc_dointvec,
956 },
957#endif
958/*
959 * NOTE: do not add new entries to this table unless you have read
960 * Documentation/sysctl/ctl_unnumbered.txt
961 */
962 { }
963};
964
965static struct ctl_table vm_table[] = {
966 {
967 .procname = "overcommit_memory",
968 .data = &sysctl_overcommit_memory,
969 .maxlen = sizeof(sysctl_overcommit_memory),
970 .mode = 0644,
971 .proc_handler = proc_dointvec,
972 },
973 {
974 .procname = "panic_on_oom",
975 .data = &sysctl_panic_on_oom,
976 .maxlen = sizeof(sysctl_panic_on_oom),
977 .mode = 0644,
978 .proc_handler = proc_dointvec,
979 },
980 {
981 .procname = "oom_kill_allocating_task",
982 .data = &sysctl_oom_kill_allocating_task,
983 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
984 .mode = 0644,
985 .proc_handler = proc_dointvec,
986 },
987 {
988 .procname = "oom_dump_tasks",
989 .data = &sysctl_oom_dump_tasks,
990 .maxlen = sizeof(sysctl_oom_dump_tasks),
991 .mode = 0644,
992 .proc_handler = proc_dointvec,
993 },
994 {
995 .procname = "overcommit_ratio",
996 .data = &sysctl_overcommit_ratio,
997 .maxlen = sizeof(sysctl_overcommit_ratio),
998 .mode = 0644,
999 .proc_handler = proc_dointvec,
1000 },
1001 {
1002 .procname = "page-cluster",
1003 .data = &page_cluster,
1004 .maxlen = sizeof(int),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec,
1007 },
1008 {
1009 .procname = "dirty_background_ratio",
1010 .data = &dirty_background_ratio,
1011 .maxlen = sizeof(dirty_background_ratio),
1012 .mode = 0644,
1013 .proc_handler = dirty_background_ratio_handler,
1014 .extra1 = &zero,
1015 .extra2 = &one_hundred,
1016 },
1017 {
1018 .procname = "dirty_background_bytes",
1019 .data = &dirty_background_bytes,
1020 .maxlen = sizeof(dirty_background_bytes),
1021 .mode = 0644,
1022 .proc_handler = dirty_background_bytes_handler,
1023 .extra1 = &one_ul,
1024 },
1025 {
1026 .procname = "dirty_ratio",
1027 .data = &vm_dirty_ratio,
1028 .maxlen = sizeof(vm_dirty_ratio),
1029 .mode = 0644,
1030 .proc_handler = dirty_ratio_handler,
1031 .extra1 = &zero,
1032 .extra2 = &one_hundred,
1033 },
1034 {
1035 .procname = "dirty_bytes",
1036 .data = &vm_dirty_bytes,
1037 .maxlen = sizeof(vm_dirty_bytes),
1038 .mode = 0644,
1039 .proc_handler = dirty_bytes_handler,
1040 .extra1 = &dirty_bytes_min,
1041 },
1042 {
1043 .procname = "dirty_writeback_centisecs",
1044 .data = &dirty_writeback_interval,
1045 .maxlen = sizeof(dirty_writeback_interval),
1046 .mode = 0644,
1047 .proc_handler = dirty_writeback_centisecs_handler,
1048 },
1049 {
1050 .procname = "dirty_expire_centisecs",
1051 .data = &dirty_expire_interval,
1052 .maxlen = sizeof(dirty_expire_interval),
1053 .mode = 0644,
1054 .proc_handler = proc_dointvec,
1055 },
1056 {
1057 .procname = "nr_pdflush_threads",
1058 .data = &nr_pdflush_threads,
1059 .maxlen = sizeof nr_pdflush_threads,
1060 .mode = 0444 /* read-only*/,
1061 .proc_handler = proc_dointvec,
1062 },
1063 {
1064 .procname = "swappiness",
1065 .data = &vm_swappiness,
1066 .maxlen = sizeof(vm_swappiness),
1067 .mode = 0644,
1068 .proc_handler = proc_dointvec_minmax,
1069 .extra1 = &zero,
1070 .extra2 = &one_hundred,
1071 },
1072#ifdef CONFIG_HUGETLB_PAGE
1073 {
1074 .procname = "nr_hugepages",
1075 .data = NULL,
1076 .maxlen = sizeof(unsigned long),
1077 .mode = 0644,
1078 .proc_handler = hugetlb_sysctl_handler,
1079 .extra1 = (void *)&hugetlb_zero,
1080 .extra2 = (void *)&hugetlb_infinity,
1081 },
1082#ifdef CONFIG_NUMA
1083 {
1084 .procname = "nr_hugepages_mempolicy",
1085 .data = NULL,
1086 .maxlen = sizeof(unsigned long),
1087 .mode = 0644,
1088 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1089 .extra1 = (void *)&hugetlb_zero,
1090 .extra2 = (void *)&hugetlb_infinity,
1091 },
1092#endif
1093 {
1094 .procname = "hugetlb_shm_group",
1095 .data = &sysctl_hugetlb_shm_group,
1096 .maxlen = sizeof(gid_t),
1097 .mode = 0644,
1098 .proc_handler = proc_dointvec,
1099 },
1100 {
1101 .procname = "hugepages_treat_as_movable",
1102 .data = &hugepages_treat_as_movable,
1103 .maxlen = sizeof(int),
1104 .mode = 0644,
1105 .proc_handler = hugetlb_treat_movable_handler,
1106 },
1107 {
1108 .procname = "nr_overcommit_hugepages",
1109 .data = NULL,
1110 .maxlen = sizeof(unsigned long),
1111 .mode = 0644,
1112 .proc_handler = hugetlb_overcommit_handler,
1113 .extra1 = (void *)&hugetlb_zero,
1114 .extra2 = (void *)&hugetlb_infinity,
1115 },
1116#endif
1117 {
1118 .procname = "lowmem_reserve_ratio",
1119 .data = &sysctl_lowmem_reserve_ratio,
1120 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1121 .mode = 0644,
1122 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1123 },
1124 {
1125 .procname = "drop_caches",
1126 .data = &sysctl_drop_caches,
1127 .maxlen = sizeof(int),
1128 .mode = 0644,
1129 .proc_handler = drop_caches_sysctl_handler,
1130 },
1131#ifdef CONFIG_COMPACTION
1132 {
1133 .procname = "compact_memory",
1134 .data = &sysctl_compact_memory,
1135 .maxlen = sizeof(int),
1136 .mode = 0200,
1137 .proc_handler = sysctl_compaction_handler,
1138 },
1139 {
1140 .procname = "extfrag_threshold",
1141 .data = &sysctl_extfrag_threshold,
1142 .maxlen = sizeof(int),
1143 .mode = 0644,
1144 .proc_handler = sysctl_extfrag_handler,
1145 .extra1 = &min_extfrag_threshold,
1146 .extra2 = &max_extfrag_threshold,
1147 },
1148
1149#endif /* CONFIG_COMPACTION */
1150 {
1151 .procname = "min_free_kbytes",
1152 .data = &min_free_kbytes,
1153 .maxlen = sizeof(min_free_kbytes),
1154 .mode = 0644,
1155 .proc_handler = min_free_kbytes_sysctl_handler,
1156 .extra1 = &zero,
1157 },
1158 {
1159 .procname = "percpu_pagelist_fraction",
1160 .data = &percpu_pagelist_fraction,
1161 .maxlen = sizeof(percpu_pagelist_fraction),
1162 .mode = 0644,
1163 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1164 .extra1 = &min_percpu_pagelist_fract,
1165 },
1166#ifdef CONFIG_MMU
1167 {
1168 .procname = "max_map_count",
1169 .data = &sysctl_max_map_count,
1170 .maxlen = sizeof(sysctl_max_map_count),
1171 .mode = 0644,
1172 .proc_handler = proc_dointvec_minmax,
1173 .extra1 = &zero,
1174 },
1175#else
1176 {
1177 .procname = "nr_trim_pages",
1178 .data = &sysctl_nr_trim_pages,
1179 .maxlen = sizeof(sysctl_nr_trim_pages),
1180 .mode = 0644,
1181 .proc_handler = proc_dointvec_minmax,
1182 .extra1 = &zero,
1183 },
1184#endif
1185 {
1186 .procname = "laptop_mode",
1187 .data = &laptop_mode,
1188 .maxlen = sizeof(laptop_mode),
1189 .mode = 0644,
1190 .proc_handler = proc_dointvec_jiffies,
1191 },
1192 {
1193 .procname = "block_dump",
1194 .data = &block_dump,
1195 .maxlen = sizeof(block_dump),
1196 .mode = 0644,
1197 .proc_handler = proc_dointvec,
1198 .extra1 = &zero,
1199 },
1200 {
1201 .procname = "vfs_cache_pressure",
1202 .data = &sysctl_vfs_cache_pressure,
1203 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1204 .mode = 0644,
1205 .proc_handler = proc_dointvec,
1206 .extra1 = &zero,
1207 },
1208#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1209 {
1210 .procname = "legacy_va_layout",
1211 .data = &sysctl_legacy_va_layout,
1212 .maxlen = sizeof(sysctl_legacy_va_layout),
1213 .mode = 0644,
1214 .proc_handler = proc_dointvec,
1215 .extra1 = &zero,
1216 },
1217#endif
1218#ifdef CONFIG_NUMA
1219 {
1220 .procname = "zone_reclaim_mode",
1221 .data = &zone_reclaim_mode,
1222 .maxlen = sizeof(zone_reclaim_mode),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec,
1225 .extra1 = &zero,
1226 },
1227 {
1228 .procname = "min_unmapped_ratio",
1229 .data = &sysctl_min_unmapped_ratio,
1230 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1231 .mode = 0644,
1232 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1233 .extra1 = &zero,
1234 .extra2 = &one_hundred,
1235 },
1236 {
1237 .procname = "min_slab_ratio",
1238 .data = &sysctl_min_slab_ratio,
1239 .maxlen = sizeof(sysctl_min_slab_ratio),
1240 .mode = 0644,
1241 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1242 .extra1 = &zero,
1243 .extra2 = &one_hundred,
1244 },
1245#endif
1246#ifdef CONFIG_SMP
1247 {
1248 .procname = "stat_interval",
1249 .data = &sysctl_stat_interval,
1250 .maxlen = sizeof(sysctl_stat_interval),
1251 .mode = 0644,
1252 .proc_handler = proc_dointvec_jiffies,
1253 },
1254#endif
1255#ifdef CONFIG_MMU
1256 {
1257 .procname = "mmap_min_addr",
1258 .data = &dac_mmap_min_addr,
1259 .maxlen = sizeof(unsigned long),
1260 .mode = 0644,
1261 .proc_handler = mmap_min_addr_handler,
1262 },
1263#endif
1264#ifdef CONFIG_NUMA
1265 {
1266 .procname = "numa_zonelist_order",
1267 .data = &numa_zonelist_order,
1268 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1269 .mode = 0644,
1270 .proc_handler = numa_zonelist_order_handler,
1271 },
1272#endif
1273#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1274 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1275 {
1276 .procname = "vdso_enabled",
1277 .data = &vdso_enabled,
1278 .maxlen = sizeof(vdso_enabled),
1279 .mode = 0644,
1280 .proc_handler = proc_dointvec,
1281 .extra1 = &zero,
1282 },
1283#endif
1284#ifdef CONFIG_HIGHMEM
1285 {
1286 .procname = "highmem_is_dirtyable",
1287 .data = &vm_highmem_is_dirtyable,
1288 .maxlen = sizeof(vm_highmem_is_dirtyable),
1289 .mode = 0644,
1290 .proc_handler = proc_dointvec_minmax,
1291 .extra1 = &zero,
1292 .extra2 = &one,
1293 },
1294#endif
1295 {
1296 .procname = "scan_unevictable_pages",
1297 .data = &scan_unevictable_pages,
1298 .maxlen = sizeof(scan_unevictable_pages),
1299 .mode = 0644,
1300 .proc_handler = scan_unevictable_handler,
1301 },
1302#ifdef CONFIG_MEMORY_FAILURE
1303 {
1304 .procname = "memory_failure_early_kill",
1305 .data = &sysctl_memory_failure_early_kill,
1306 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1307 .mode = 0644,
1308 .proc_handler = proc_dointvec_minmax,
1309 .extra1 = &zero,
1310 .extra2 = &one,
1311 },
1312 {
1313 .procname = "memory_failure_recovery",
1314 .data = &sysctl_memory_failure_recovery,
1315 .maxlen = sizeof(sysctl_memory_failure_recovery),
1316 .mode = 0644,
1317 .proc_handler = proc_dointvec_minmax,
1318 .extra1 = &zero,
1319 .extra2 = &one,
1320 },
1321#endif
1322
1323/*
1324 * NOTE: do not add new entries to this table unless you have read
1325 * Documentation/sysctl/ctl_unnumbered.txt
1326 */
1327 { }
1328};
1329
1330#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1331static struct ctl_table binfmt_misc_table[] = {
1332 { }
1333};
1334#endif
1335
1336static struct ctl_table fs_table[] = {
1337 {
1338 .procname = "inode-nr",
1339 .data = &inodes_stat,
1340 .maxlen = 2*sizeof(int),
1341 .mode = 0444,
1342 .proc_handler = proc_dointvec,
1343 },
1344 {
1345 .procname = "inode-state",
1346 .data = &inodes_stat,
1347 .maxlen = 7*sizeof(int),
1348 .mode = 0444,
1349 .proc_handler = proc_dointvec,
1350 },
1351 {
1352 .procname = "file-nr",
1353 .data = &files_stat,
1354 .maxlen = 3*sizeof(int),
1355 .mode = 0444,
1356 .proc_handler = proc_nr_files,
1357 },
1358 {
1359 .procname = "file-max",
1360 .data = &files_stat.max_files,
1361 .maxlen = sizeof(int),
1362 .mode = 0644,
1363 .proc_handler = proc_dointvec,
1364 },
1365 {
1366 .procname = "nr_open",
1367 .data = &sysctl_nr_open,
1368 .maxlen = sizeof(int),
1369 .mode = 0644,
1370 .proc_handler = proc_dointvec_minmax,
1371 .extra1 = &sysctl_nr_open_min,
1372 .extra2 = &sysctl_nr_open_max,
1373 },
1374 {
1375 .procname = "dentry-state",
1376 .data = &dentry_stat,
1377 .maxlen = 6*sizeof(int),
1378 .mode = 0444,
1379 .proc_handler = proc_dointvec,
1380 },
1381 {
1382 .procname = "overflowuid",
1383 .data = &fs_overflowuid,
1384 .maxlen = sizeof(int),
1385 .mode = 0644,
1386 .proc_handler = proc_dointvec_minmax,
1387 .extra1 = &minolduid,
1388 .extra2 = &maxolduid,
1389 },
1390 {
1391 .procname = "overflowgid",
1392 .data = &fs_overflowgid,
1393 .maxlen = sizeof(int),
1394 .mode = 0644,
1395 .proc_handler = proc_dointvec_minmax,
1396 .extra1 = &minolduid,
1397 .extra2 = &maxolduid,
1398 },
1399#ifdef CONFIG_FILE_LOCKING
1400 {
1401 .procname = "leases-enable",
1402 .data = &leases_enable,
1403 .maxlen = sizeof(int),
1404 .mode = 0644,
1405 .proc_handler = proc_dointvec,
1406 },
1407#endif
1408#ifdef CONFIG_DNOTIFY
1409 {
1410 .procname = "dir-notify-enable",
1411 .data = &dir_notify_enable,
1412 .maxlen = sizeof(int),
1413 .mode = 0644,
1414 .proc_handler = proc_dointvec,
1415 },
1416#endif
1417#ifdef CONFIG_MMU
1418#ifdef CONFIG_FILE_LOCKING
1419 {
1420 .procname = "lease-break-time",
1421 .data = &lease_break_time,
1422 .maxlen = sizeof(int),
1423 .mode = 0644,
1424 .proc_handler = proc_dointvec,
1425 },
1426#endif
1427#ifdef CONFIG_AIO
1428 {
1429 .procname = "aio-nr",
1430 .data = &aio_nr,
1431 .maxlen = sizeof(aio_nr),
1432 .mode = 0444,
1433 .proc_handler = proc_doulongvec_minmax,
1434 },
1435 {
1436 .procname = "aio-max-nr",
1437 .data = &aio_max_nr,
1438 .maxlen = sizeof(aio_max_nr),
1439 .mode = 0644,
1440 .proc_handler = proc_doulongvec_minmax,
1441 },
1442#endif /* CONFIG_AIO */
1443#ifdef CONFIG_INOTIFY_USER
1444 {
1445 .procname = "inotify",
1446 .mode = 0555,
1447 .child = inotify_table,
1448 },
1449#endif
1450#ifdef CONFIG_EPOLL
1451 {
1452 .procname = "epoll",
1453 .mode = 0555,
1454 .child = epoll_table,
1455 },
1456#endif
1457#endif
1458 {
1459 .procname = "suid_dumpable",
1460 .data = &suid_dumpable,
1461 .maxlen = sizeof(int),
1462 .mode = 0644,
1463 .proc_handler = proc_dointvec_minmax,
1464 .extra1 = &zero,
1465 .extra2 = &two,
1466 },
1467#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1468 {
1469 .procname = "binfmt_misc",
1470 .mode = 0555,
1471 .child = binfmt_misc_table,
1472 },
1473#endif
1474 {
1475 .procname = "pipe-max-size",
1476 .data = &pipe_max_size,
1477 .maxlen = sizeof(int),
1478 .mode = 0644,
1479 .proc_handler = &pipe_proc_fn,
1480 .extra1 = &pipe_min_size,
1481 },
1482/*
1483 * NOTE: do not add new entries to this table unless you have read
1484 * Documentation/sysctl/ctl_unnumbered.txt
1485 */
1486 { }
1487};
1488
1489static struct ctl_table debug_table[] = {
1490#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1491 defined(CONFIG_S390)
1492 {
1493 .procname = "exception-trace",
1494 .data = &show_unhandled_signals,
1495 .maxlen = sizeof(int),
1496 .mode = 0644,
1497 .proc_handler = proc_dointvec
1498 },
1499#endif
1500#if defined(CONFIG_OPTPROBES)
1501 {
1502 .procname = "kprobes-optimization",
1503 .data = &sysctl_kprobes_optimization,
1504 .maxlen = sizeof(int),
1505 .mode = 0644,
1506 .proc_handler = proc_kprobes_optimization_handler,
1507 .extra1 = &zero,
1508 .extra2 = &one,
1509 },
1510#endif
1511 { }
1512};
1513
1514static struct ctl_table dev_table[] = {
1515 { }
1516};
1517
1518static DEFINE_SPINLOCK(sysctl_lock);
1519
1520/* called under sysctl_lock */
1521static int use_table(struct ctl_table_header *p)
1522{
1523 if (unlikely(p->unregistering))
1524 return 0;
1525 p->used++;
1526 return 1;
1527}
1528
1529/* called under sysctl_lock */
1530static void unuse_table(struct ctl_table_header *p)
1531{
1532 if (!--p->used)
1533 if (unlikely(p->unregistering))
1534 complete(p->unregistering);
1535}
1536
1537/* called under sysctl_lock, will reacquire if has to wait */
1538static void start_unregistering(struct ctl_table_header *p)
1539{
1540 /*
1541 * if p->used is 0, nobody will ever touch that entry again;
1542 * we'll eliminate all paths to it before dropping sysctl_lock
1543 */
1544 if (unlikely(p->used)) {
1545 struct completion wait;
1546 init_completion(&wait);
1547 p->unregistering = &wait;
1548 spin_unlock(&sysctl_lock);
1549 wait_for_completion(&wait);
1550 spin_lock(&sysctl_lock);
1551 } else {
1552 /* anything non-NULL; we'll never dereference it */
1553 p->unregistering = ERR_PTR(-EINVAL);
1554 }
1555 /*
1556 * do not remove from the list until nobody holds it; walking the
1557 * list in do_sysctl() relies on that.
1558 */
1559 list_del_init(&p->ctl_entry);
1560}
1561
1562void sysctl_head_get(struct ctl_table_header *head)
1563{
1564 spin_lock(&sysctl_lock);
1565 head->count++;
1566 spin_unlock(&sysctl_lock);
1567}
1568
1569void sysctl_head_put(struct ctl_table_header *head)
1570{
1571 spin_lock(&sysctl_lock);
1572 if (!--head->count)
1573 kfree(head);
1574 spin_unlock(&sysctl_lock);
1575}
1576
1577struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1578{
1579 if (!head)
1580 BUG();
1581 spin_lock(&sysctl_lock);
1582 if (!use_table(head))
1583 head = ERR_PTR(-ENOENT);
1584 spin_unlock(&sysctl_lock);
1585 return head;
1586}
1587
1588void sysctl_head_finish(struct ctl_table_header *head)
1589{
1590 if (!head)
1591 return;
1592 spin_lock(&sysctl_lock);
1593 unuse_table(head);
1594 spin_unlock(&sysctl_lock);
1595}
1596
1597static struct ctl_table_set *
1598lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1599{
1600 struct ctl_table_set *set = &root->default_set;
1601 if (root->lookup)
1602 set = root->lookup(root, namespaces);
1603 return set;
1604}
1605
1606static struct list_head *
1607lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1608{
1609 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1610 return &set->list;
1611}
1612
1613struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1614 struct ctl_table_header *prev)
1615{
1616 struct ctl_table_root *root;
1617 struct list_head *header_list;
1618 struct ctl_table_header *head;
1619 struct list_head *tmp;
1620
1621 spin_lock(&sysctl_lock);
1622 if (prev) {
1623 head = prev;
1624 tmp = &prev->ctl_entry;
1625 unuse_table(prev);
1626 goto next;
1627 }
1628 tmp = &root_table_header.ctl_entry;
1629 for (;;) {
1630 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1631
1632 if (!use_table(head))
1633 goto next;
1634 spin_unlock(&sysctl_lock);
1635 return head;
1636 next:
1637 root = head->root;
1638 tmp = tmp->next;
1639 header_list = lookup_header_list(root, namespaces);
1640 if (tmp != header_list)
1641 continue;
1642
1643 do {
1644 root = list_entry(root->root_list.next,
1645 struct ctl_table_root, root_list);
1646 if (root == &sysctl_table_root)
1647 goto out;
1648 header_list = lookup_header_list(root, namespaces);
1649 } while (list_empty(header_list));
1650 tmp = header_list->next;
1651 }
1652out:
1653 spin_unlock(&sysctl_lock);
1654 return NULL;
1655}
1656
1657struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1658{
1659 return __sysctl_head_next(current->nsproxy, prev);
1660}
1661
1662void register_sysctl_root(struct ctl_table_root *root)
1663{
1664 spin_lock(&sysctl_lock);
1665 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1666 spin_unlock(&sysctl_lock);
1667}
1668
1669/*
1670 * sysctl_perm does NOT grant the superuser all rights automatically, because
1671 * some sysctl variables are readonly even to root.
1672 */
1673
1674static int test_perm(int mode, int op)
1675{
1676 if (!current_euid())
1677 mode >>= 6;
1678 else if (in_egroup_p(0))
1679 mode >>= 3;
1680 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1681 return 0;
1682 return -EACCES;
1683}
1684
1685int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1686{
1687 int error;
1688 int mode;
1689
1690 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1691 if (error)
1692 return error;
1693
1694 if (root->permissions)
1695 mode = root->permissions(root, current->nsproxy, table);
1696 else
1697 mode = table->mode;
1698
1699 return test_perm(mode, op);
1700}
1701
1702static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1703{
1704 for (; table->procname; table++) {
1705 table->parent = parent;
1706 if (table->child)
1707 sysctl_set_parent(table, table->child);
1708 }
1709}
1710
1711static __init int sysctl_init(void)
1712{
1713 sysctl_set_parent(NULL, root_table);
1714#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1715 {
1716 int err;
1717 err = sysctl_check_table(current->nsproxy, root_table);
1718 }
1719#endif
1720 return 0;
1721}
1722
1723core_initcall(sysctl_init);
1724
1725static struct ctl_table *is_branch_in(struct ctl_table *branch,
1726 struct ctl_table *table)
1727{
1728 struct ctl_table *p;
1729 const char *s = branch->procname;
1730
1731 /* branch should have named subdirectory as its first element */
1732 if (!s || !branch->child)
1733 return NULL;
1734
1735 /* ... and nothing else */
1736 if (branch[1].procname)
1737 return NULL;
1738
1739 /* table should contain subdirectory with the same name */
1740 for (p = table; p->procname; p++) {
1741 if (!p->child)
1742 continue;
1743 if (p->procname && strcmp(p->procname, s) == 0)
1744 return p;
1745 }
1746 return NULL;
1747}
1748
1749/* see if attaching q to p would be an improvement */
1750static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1751{
1752 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1753 struct ctl_table *next;
1754 int is_better = 0;
1755 int not_in_parent = !p->attached_by;
1756
1757 while ((next = is_branch_in(by, to)) != NULL) {
1758 if (by == q->attached_by)
1759 is_better = 1;
1760 if (to == p->attached_by)
1761 not_in_parent = 1;
1762 by = by->child;
1763 to = next->child;
1764 }
1765
1766 if (is_better && not_in_parent) {
1767 q->attached_by = by;
1768 q->attached_to = to;
1769 q->parent = p;
1770 }
1771}
1772
1773/**
1774 * __register_sysctl_paths - register a sysctl hierarchy
1775 * @root: List of sysctl headers to register on
1776 * @namespaces: Data to compute which lists of sysctl entries are visible
1777 * @path: The path to the directory the sysctl table is in.
1778 * @table: the top-level table structure
1779 *
1780 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1781 * array. A completely 0 filled entry terminates the table.
1782 *
1783 * The members of the &struct ctl_table structure are used as follows:
1784 *
1785 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1786 * enter a sysctl file
1787 *
1788 * data - a pointer to data for use by proc_handler
1789 *
1790 * maxlen - the maximum size in bytes of the data
1791 *
1792 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1793 *
1794 * child - a pointer to the child sysctl table if this entry is a directory, or
1795 * %NULL.
1796 *
1797 * proc_handler - the text handler routine (described below)
1798 *
1799 * de - for internal use by the sysctl routines
1800 *
1801 * extra1, extra2 - extra pointers usable by the proc handler routines
1802 *
1803 * Leaf nodes in the sysctl tree will be represented by a single file
1804 * under /proc; non-leaf nodes will be represented by directories.
1805 *
1806 * sysctl(2) can automatically manage read and write requests through
1807 * the sysctl table. The data and maxlen fields of the ctl_table
1808 * struct enable minimal validation of the values being written to be
1809 * performed, and the mode field allows minimal authentication.
1810 *
1811 * There must be a proc_handler routine for any terminal nodes
1812 * mirrored under /proc/sys (non-terminals are handled by a built-in
1813 * directory handler). Several default handlers are available to
1814 * cover common cases -
1815 *
1816 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1817 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1818 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1819 *
1820 * It is the handler's job to read the input buffer from user memory
1821 * and process it. The handler should return 0 on success.
1822 *
1823 * This routine returns %NULL on a failure to register, and a pointer
1824 * to the table header on success.
1825 */
1826struct ctl_table_header *__register_sysctl_paths(
1827 struct ctl_table_root *root,
1828 struct nsproxy *namespaces,
1829 const struct ctl_path *path, struct ctl_table *table)
1830{
1831 struct ctl_table_header *header;
1832 struct ctl_table *new, **prevp;
1833 unsigned int n, npath;
1834 struct ctl_table_set *set;
1835
1836 /* Count the path components */
1837 for (npath = 0; path[npath].procname; ++npath)
1838 ;
1839
1840 /*
1841 * For each path component, allocate a 2-element ctl_table array.
1842 * The first array element will be filled with the sysctl entry
1843 * for this, the second will be the sentinel (procname == 0).
1844 *
1845 * We allocate everything in one go so that we don't have to
1846 * worry about freeing additional memory in unregister_sysctl_table.
1847 */
1848 header = kzalloc(sizeof(struct ctl_table_header) +
1849 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1850 if (!header)
1851 return NULL;
1852
1853 new = (struct ctl_table *) (header + 1);
1854
1855 /* Now connect the dots */
1856 prevp = &header->ctl_table;
1857 for (n = 0; n < npath; ++n, ++path) {
1858 /* Copy the procname */
1859 new->procname = path->procname;
1860 new->mode = 0555;
1861
1862 *prevp = new;
1863 prevp = &new->child;
1864
1865 new += 2;
1866 }
1867 *prevp = table;
1868 header->ctl_table_arg = table;
1869
1870 INIT_LIST_HEAD(&header->ctl_entry);
1871 header->used = 0;
1872 header->unregistering = NULL;
1873 header->root = root;
1874 sysctl_set_parent(NULL, header->ctl_table);
1875 header->count = 1;
1876#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1877 if (sysctl_check_table(namespaces, header->ctl_table)) {
1878 kfree(header);
1879 return NULL;
1880 }
1881#endif
1882 spin_lock(&sysctl_lock);
1883 header->set = lookup_header_set(root, namespaces);
1884 header->attached_by = header->ctl_table;
1885 header->attached_to = root_table;
1886 header->parent = &root_table_header;
1887 for (set = header->set; set; set = set->parent) {
1888 struct ctl_table_header *p;
1889 list_for_each_entry(p, &set->list, ctl_entry) {
1890 if (p->unregistering)
1891 continue;
1892 try_attach(p, header);
1893 }
1894 }
1895 header->parent->count++;
1896 list_add_tail(&header->ctl_entry, &header->set->list);
1897 spin_unlock(&sysctl_lock);
1898
1899 return header;
1900}
1901
1902/**
1903 * register_sysctl_table_path - register a sysctl table hierarchy
1904 * @path: The path to the directory the sysctl table is in.
1905 * @table: the top-level table structure
1906 *
1907 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1908 * array. A completely 0 filled entry terminates the table.
1909 *
1910 * See __register_sysctl_paths for more details.
1911 */
1912struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1913 struct ctl_table *table)
1914{
1915 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1916 path, table);
1917}
1918
1919/**
1920 * register_sysctl_table - register a sysctl table hierarchy
1921 * @table: the top-level table structure
1922 *
1923 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1924 * array. A completely 0 filled entry terminates the table.
1925 *
1926 * See register_sysctl_paths for more details.
1927 */
1928struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1929{
1930 static const struct ctl_path null_path[] = { {} };
1931
1932 return register_sysctl_paths(null_path, table);
1933}
1934
1935/**
1936 * unregister_sysctl_table - unregister a sysctl table hierarchy
1937 * @header: the header returned from register_sysctl_table
1938 *
1939 * Unregisters the sysctl table and all children. proc entries may not
1940 * actually be removed until they are no longer used by anyone.
1941 */
1942void unregister_sysctl_table(struct ctl_table_header * header)
1943{
1944 might_sleep();
1945
1946 if (header == NULL)
1947 return;
1948
1949 spin_lock(&sysctl_lock);
1950 start_unregistering(header);
1951 if (!--header->parent->count) {
1952 WARN_ON(1);
1953 kfree(header->parent);
1954 }
1955 if (!--header->count)
1956 kfree(header);
1957 spin_unlock(&sysctl_lock);
1958}
1959
1960int sysctl_is_seen(struct ctl_table_header *p)
1961{
1962 struct ctl_table_set *set = p->set;
1963 int res;
1964 spin_lock(&sysctl_lock);
1965 if (p->unregistering)
1966 res = 0;
1967 else if (!set->is_seen)
1968 res = 1;
1969 else
1970 res = set->is_seen(set);
1971 spin_unlock(&sysctl_lock);
1972 return res;
1973}
1974
1975void setup_sysctl_set(struct ctl_table_set *p,
1976 struct ctl_table_set *parent,
1977 int (*is_seen)(struct ctl_table_set *))
1978{
1979 INIT_LIST_HEAD(&p->list);
1980 p->parent = parent ? parent : &sysctl_table_root.default_set;
1981 p->is_seen = is_seen;
1982}
1983
1984#else /* !CONFIG_SYSCTL */
1985struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1986{
1987 return NULL;
1988}
1989
1990struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1991 struct ctl_table *table)
1992{
1993 return NULL;
1994}
1995
1996void unregister_sysctl_table(struct ctl_table_header * table)
1997{
1998}
1999
2000void setup_sysctl_set(struct ctl_table_set *p,
2001 struct ctl_table_set *parent,
2002 int (*is_seen)(struct ctl_table_set *))
2003{
2004}
2005
2006void sysctl_head_put(struct ctl_table_header *head)
2007{
2008}
2009
2010#endif /* CONFIG_SYSCTL */
2011
2012/*
2013 * /proc/sys support
2014 */
2015
2016#ifdef CONFIG_PROC_SYSCTL
2017
2018static int _proc_do_string(void* data, int maxlen, int write,
2019 void __user *buffer,
2020 size_t *lenp, loff_t *ppos)
2021{
2022 size_t len;
2023 char __user *p;
2024 char c;
2025
2026 if (!data || !maxlen || !*lenp) {
2027 *lenp = 0;
2028 return 0;
2029 }
2030
2031 if (write) {
2032 len = 0;
2033 p = buffer;
2034 while (len < *lenp) {
2035 if (get_user(c, p++))
2036 return -EFAULT;
2037 if (c == 0 || c == '\n')
2038 break;
2039 len++;
2040 }
2041 if (len >= maxlen)
2042 len = maxlen-1;
2043 if(copy_from_user(data, buffer, len))
2044 return -EFAULT;
2045 ((char *) data)[len] = 0;
2046 *ppos += *lenp;
2047 } else {
2048 len = strlen(data);
2049 if (len > maxlen)
2050 len = maxlen;
2051
2052 if (*ppos > len) {
2053 *lenp = 0;
2054 return 0;
2055 }
2056
2057 data += *ppos;
2058 len -= *ppos;
2059
2060 if (len > *lenp)
2061 len = *lenp;
2062 if (len)
2063 if(copy_to_user(buffer, data, len))
2064 return -EFAULT;
2065 if (len < *lenp) {
2066 if(put_user('\n', ((char __user *) buffer) + len))
2067 return -EFAULT;
2068 len++;
2069 }
2070 *lenp = len;
2071 *ppos += len;
2072 }
2073 return 0;
2074}
2075
2076/**
2077 * proc_dostring - read a string sysctl
2078 * @table: the sysctl table
2079 * @write: %TRUE if this is a write to the sysctl file
2080 * @buffer: the user buffer
2081 * @lenp: the size of the user buffer
2082 * @ppos: file position
2083 *
2084 * Reads/writes a string from/to the user buffer. If the kernel
2085 * buffer provided is not large enough to hold the string, the
2086 * string is truncated. The copied string is %NULL-terminated.
2087 * If the string is being read by the user process, it is copied
2088 * and a newline '\n' is added. It is truncated if the buffer is
2089 * not large enough.
2090 *
2091 * Returns 0 on success.
2092 */
2093int proc_dostring(struct ctl_table *table, int write,
2094 void __user *buffer, size_t *lenp, loff_t *ppos)
2095{
2096 return _proc_do_string(table->data, table->maxlen, write,
2097 buffer, lenp, ppos);
2098}
2099
2100static size_t proc_skip_spaces(char **buf)
2101{
2102 size_t ret;
2103 char *tmp = skip_spaces(*buf);
2104 ret = tmp - *buf;
2105 *buf = tmp;
2106 return ret;
2107}
2108
2109static void proc_skip_char(char **buf, size_t *size, const char v)
2110{
2111 while (*size) {
2112 if (**buf != v)
2113 break;
2114 (*size)--;
2115 (*buf)++;
2116 }
2117}
2118
2119#define TMPBUFLEN 22
2120/**
2121 * proc_get_long - reads an ASCII formatted integer from a user buffer
2122 *
2123 * @buf: a kernel buffer
2124 * @size: size of the kernel buffer
2125 * @val: this is where the number will be stored
2126 * @neg: set to %TRUE if number is negative
2127 * @perm_tr: a vector which contains the allowed trailers
2128 * @perm_tr_len: size of the perm_tr vector
2129 * @tr: pointer to store the trailer character
2130 *
2131 * In case of success %0 is returned and @buf and @size are updated with
2132 * the amount of bytes read. If @tr is non-NULL and a trailing
2133 * character exists (size is non-zero after returning from this
2134 * function), @tr is updated with the trailing character.
2135 */
2136static int proc_get_long(char **buf, size_t *size,
2137 unsigned long *val, bool *neg,
2138 const char *perm_tr, unsigned perm_tr_len, char *tr)
2139{
2140 int len;
2141 char *p, tmp[TMPBUFLEN];
2142
2143 if (!*size)
2144 return -EINVAL;
2145
2146 len = *size;
2147 if (len > TMPBUFLEN - 1)
2148 len = TMPBUFLEN - 1;
2149
2150 memcpy(tmp, *buf, len);
2151
2152 tmp[len] = 0;
2153 p = tmp;
2154 if (*p == '-' && *size > 1) {
2155 *neg = true;
2156 p++;
2157 } else
2158 *neg = false;
2159 if (!isdigit(*p))
2160 return -EINVAL;
2161
2162 *val = simple_strtoul(p, &p, 0);
2163
2164 len = p - tmp;
2165
2166 /* We don't know if the next char is whitespace thus we may accept
2167 * invalid integers (e.g. 1234...a) or two integers instead of one
2168 * (e.g. 123...1). So lets not allow such large numbers. */
2169 if (len == TMPBUFLEN - 1)
2170 return -EINVAL;
2171
2172 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2173 return -EINVAL;
2174
2175 if (tr && (len < *size))
2176 *tr = *p;
2177
2178 *buf += len;
2179 *size -= len;
2180
2181 return 0;
2182}
2183
2184/**
2185 * proc_put_long - converts an integer to a decimal ASCII formatted string
2186 *
2187 * @buf: the user buffer
2188 * @size: the size of the user buffer
2189 * @val: the integer to be converted
2190 * @neg: sign of the number, %TRUE for negative
2191 *
2192 * In case of success %0 is returned and @buf and @size are updated with
2193 * the amount of bytes written.
2194 */
2195static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2196 bool neg)
2197{
2198 int len;
2199 char tmp[TMPBUFLEN], *p = tmp;
2200
2201 sprintf(p, "%s%lu", neg ? "-" : "", val);
2202 len = strlen(tmp);
2203 if (len > *size)
2204 len = *size;
2205 if (copy_to_user(*buf, tmp, len))
2206 return -EFAULT;
2207 *size -= len;
2208 *buf += len;
2209 return 0;
2210}
2211#undef TMPBUFLEN
2212
2213static int proc_put_char(void __user **buf, size_t *size, char c)
2214{
2215 if (*size) {
2216 char __user **buffer = (char __user **)buf;
2217 if (put_user(c, *buffer))
2218 return -EFAULT;
2219 (*size)--, (*buffer)++;
2220 *buf = *buffer;
2221 }
2222 return 0;
2223}
2224
2225static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2226 int *valp,
2227 int write, void *data)
2228{
2229 if (write) {
2230 *valp = *negp ? -*lvalp : *lvalp;
2231 } else {
2232 int val = *valp;
2233 if (val < 0) {
2234 *negp = true;
2235 *lvalp = (unsigned long)-val;
2236 } else {
2237 *negp = false;
2238 *lvalp = (unsigned long)val;
2239 }
2240 }
2241 return 0;
2242}
2243
2244static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2245
2246static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2247 int write, void __user *buffer,
2248 size_t *lenp, loff_t *ppos,
2249 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2250 int write, void *data),
2251 void *data)
2252{
2253 int *i, vleft, first = 1, err = 0;
2254 unsigned long page = 0;
2255 size_t left;
2256 char *kbuf;
2257
2258 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2259 *lenp = 0;
2260 return 0;
2261 }
2262
2263 i = (int *) tbl_data;
2264 vleft = table->maxlen / sizeof(*i);
2265 left = *lenp;
2266
2267 if (!conv)
2268 conv = do_proc_dointvec_conv;
2269
2270 if (write) {
2271 if (left > PAGE_SIZE - 1)
2272 left = PAGE_SIZE - 1;
2273 page = __get_free_page(GFP_TEMPORARY);
2274 kbuf = (char *) page;
2275 if (!kbuf)
2276 return -ENOMEM;
2277 if (copy_from_user(kbuf, buffer, left)) {
2278 err = -EFAULT;
2279 goto free;
2280 }
2281 kbuf[left] = 0;
2282 }
2283
2284 for (; left && vleft--; i++, first=0) {
2285 unsigned long lval;
2286 bool neg;
2287
2288 if (write) {
2289 left -= proc_skip_spaces(&kbuf);
2290
2291 if (!left)
2292 break;
2293 err = proc_get_long(&kbuf, &left, &lval, &neg,
2294 proc_wspace_sep,
2295 sizeof(proc_wspace_sep), NULL);
2296 if (err)
2297 break;
2298 if (conv(&neg, &lval, i, 1, data)) {
2299 err = -EINVAL;
2300 break;
2301 }
2302 } else {
2303 if (conv(&neg, &lval, i, 0, data)) {
2304 err = -EINVAL;
2305 break;
2306 }
2307 if (!first)
2308 err = proc_put_char(&buffer, &left, '\t');
2309 if (err)
2310 break;
2311 err = proc_put_long(&buffer, &left, lval, neg);
2312 if (err)
2313 break;
2314 }
2315 }
2316
2317 if (!write && !first && left && !err)
2318 err = proc_put_char(&buffer, &left, '\n');
2319 if (write && !err && left)
2320 left -= proc_skip_spaces(&kbuf);
2321free:
2322 if (write) {
2323 free_page(page);
2324 if (first)
2325 return err ? : -EINVAL;
2326 }
2327 *lenp -= left;
2328 *ppos += *lenp;
2329 return err;
2330}
2331
2332static int do_proc_dointvec(struct ctl_table *table, int write,
2333 void __user *buffer, size_t *lenp, loff_t *ppos,
2334 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2335 int write, void *data),
2336 void *data)
2337{
2338 return __do_proc_dointvec(table->data, table, write,
2339 buffer, lenp, ppos, conv, data);
2340}
2341
2342/**
2343 * proc_dointvec - read a vector of integers
2344 * @table: the sysctl table
2345 * @write: %TRUE if this is a write to the sysctl file
2346 * @buffer: the user buffer
2347 * @lenp: the size of the user buffer
2348 * @ppos: file position
2349 *
2350 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2351 * values from/to the user buffer, treated as an ASCII string.
2352 *
2353 * Returns 0 on success.
2354 */
2355int proc_dointvec(struct ctl_table *table, int write,
2356 void __user *buffer, size_t *lenp, loff_t *ppos)
2357{
2358 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2359 NULL,NULL);
2360}
2361
2362/*
2363 * Taint values can only be increased
2364 * This means we can safely use a temporary.
2365 */
2366static int proc_taint(struct ctl_table *table, int write,
2367 void __user *buffer, size_t *lenp, loff_t *ppos)
2368{
2369 struct ctl_table t;
2370 unsigned long tmptaint = get_taint();
2371 int err;
2372
2373 if (write && !capable(CAP_SYS_ADMIN))
2374 return -EPERM;
2375
2376 t = *table;
2377 t.data = &tmptaint;
2378 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2379 if (err < 0)
2380 return err;
2381
2382 if (write) {
2383 /*
2384 * Poor man's atomic or. Not worth adding a primitive
2385 * to everyone's atomic.h for this
2386 */
2387 int i;
2388 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2389 if ((tmptaint >> i) & 1)
2390 add_taint(i);
2391 }
2392 }
2393
2394 return err;
2395}
2396
2397struct do_proc_dointvec_minmax_conv_param {
2398 int *min;
2399 int *max;
2400};
2401
2402static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2403 int *valp,
2404 int write, void *data)
2405{
2406 struct do_proc_dointvec_minmax_conv_param *param = data;
2407 if (write) {
2408 int val = *negp ? -*lvalp : *lvalp;
2409 if ((param->min && *param->min > val) ||
2410 (param->max && *param->max < val))
2411 return -EINVAL;
2412 *valp = val;
2413 } else {
2414 int val = *valp;
2415 if (val < 0) {
2416 *negp = true;
2417 *lvalp = (unsigned long)-val;
2418 } else {
2419 *negp = false;
2420 *lvalp = (unsigned long)val;
2421 }
2422 }
2423 return 0;
2424}
2425
2426/**
2427 * proc_dointvec_minmax - read a vector of integers with min/max values
2428 * @table: the sysctl table
2429 * @write: %TRUE if this is a write to the sysctl file
2430 * @buffer: the user buffer
2431 * @lenp: the size of the user buffer
2432 * @ppos: file position
2433 *
2434 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2435 * values from/to the user buffer, treated as an ASCII string.
2436 *
2437 * This routine will ensure the values are within the range specified by
2438 * table->extra1 (min) and table->extra2 (max).
2439 *
2440 * Returns 0 on success.
2441 */
2442int proc_dointvec_minmax(struct ctl_table *table, int write,
2443 void __user *buffer, size_t *lenp, loff_t *ppos)
2444{
2445 struct do_proc_dointvec_minmax_conv_param param = {
2446 .min = (int *) table->extra1,
2447 .max = (int *) table->extra2,
2448 };
2449 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2450 do_proc_dointvec_minmax_conv, &param);
2451}
2452
2453static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2454 void __user *buffer,
2455 size_t *lenp, loff_t *ppos,
2456 unsigned long convmul,
2457 unsigned long convdiv)
2458{
2459 unsigned long *i, *min, *max;
2460 int vleft, first = 1, err = 0;
2461 unsigned long page = 0;
2462 size_t left;
2463 char *kbuf;
2464
2465 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2466 *lenp = 0;
2467 return 0;
2468 }
2469
2470 i = (unsigned long *) data;
2471 min = (unsigned long *) table->extra1;
2472 max = (unsigned long *) table->extra2;
2473 vleft = table->maxlen / sizeof(unsigned long);
2474 left = *lenp;
2475
2476 if (write) {
2477 if (left > PAGE_SIZE - 1)
2478 left = PAGE_SIZE - 1;
2479 page = __get_free_page(GFP_TEMPORARY);
2480 kbuf = (char *) page;
2481 if (!kbuf)
2482 return -ENOMEM;
2483 if (copy_from_user(kbuf, buffer, left)) {
2484 err = -EFAULT;
2485 goto free;
2486 }
2487 kbuf[left] = 0;
2488 }
2489
2490 for (; left && vleft--; i++, min++, max++, first=0) {
2491 unsigned long val;
2492
2493 if (write) {
2494 bool neg;
2495
2496 left -= proc_skip_spaces(&kbuf);
2497
2498 err = proc_get_long(&kbuf, &left, &val, &neg,
2499 proc_wspace_sep,
2500 sizeof(proc_wspace_sep), NULL);
2501 if (err)
2502 break;
2503 if (neg)
2504 continue;
2505 if ((min && val < *min) || (max && val > *max))
2506 continue;
2507 *i = val;
2508 } else {
2509 val = convdiv * (*i) / convmul;
2510 if (!first)
2511 err = proc_put_char(&buffer, &left, '\t');
2512 err = proc_put_long(&buffer, &left, val, false);
2513 if (err)
2514 break;
2515 }
2516 }
2517
2518 if (!write && !first && left && !err)
2519 err = proc_put_char(&buffer, &left, '\n');
2520 if (write && !err)
2521 left -= proc_skip_spaces(&kbuf);
2522free:
2523 if (write) {
2524 free_page(page);
2525 if (first)
2526 return err ? : -EINVAL;
2527 }
2528 *lenp -= left;
2529 *ppos += *lenp;
2530 return err;
2531}
2532
2533static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2534 void __user *buffer,
2535 size_t *lenp, loff_t *ppos,
2536 unsigned long convmul,
2537 unsigned long convdiv)
2538{
2539 return __do_proc_doulongvec_minmax(table->data, table, write,
2540 buffer, lenp, ppos, convmul, convdiv);
2541}
2542
2543/**
2544 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2545 * @table: the sysctl table
2546 * @write: %TRUE if this is a write to the sysctl file
2547 * @buffer: the user buffer
2548 * @lenp: the size of the user buffer
2549 * @ppos: file position
2550 *
2551 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2552 * values from/to the user buffer, treated as an ASCII string.
2553 *
2554 * This routine will ensure the values are within the range specified by
2555 * table->extra1 (min) and table->extra2 (max).
2556 *
2557 * Returns 0 on success.
2558 */
2559int proc_doulongvec_minmax(struct ctl_table *table, int write,
2560 void __user *buffer, size_t *lenp, loff_t *ppos)
2561{
2562 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2563}
2564
2565/**
2566 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2567 * @table: the sysctl table
2568 * @write: %TRUE if this is a write to the sysctl file
2569 * @buffer: the user buffer
2570 * @lenp: the size of the user buffer
2571 * @ppos: file position
2572 *
2573 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2574 * values from/to the user buffer, treated as an ASCII string. The values
2575 * are treated as milliseconds, and converted to jiffies when they are stored.
2576 *
2577 * This routine will ensure the values are within the range specified by
2578 * table->extra1 (min) and table->extra2 (max).
2579 *
2580 * Returns 0 on success.
2581 */
2582int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2583 void __user *buffer,
2584 size_t *lenp, loff_t *ppos)
2585{
2586 return do_proc_doulongvec_minmax(table, write, buffer,
2587 lenp, ppos, HZ, 1000l);
2588}
2589
2590
2591static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2592 int *valp,
2593 int write, void *data)
2594{
2595 if (write) {
2596 if (*lvalp > LONG_MAX / HZ)
2597 return 1;
2598 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2599 } else {
2600 int val = *valp;
2601 unsigned long lval;
2602 if (val < 0) {
2603 *negp = true;
2604 lval = (unsigned long)-val;
2605 } else {
2606 *negp = false;
2607 lval = (unsigned long)val;
2608 }
2609 *lvalp = lval / HZ;
2610 }
2611 return 0;
2612}
2613
2614static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2615 int *valp,
2616 int write, void *data)
2617{
2618 if (write) {
2619 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2620 return 1;
2621 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2622 } else {
2623 int val = *valp;
2624 unsigned long lval;
2625 if (val < 0) {
2626 *negp = true;
2627 lval = (unsigned long)-val;
2628 } else {
2629 *negp = false;
2630 lval = (unsigned long)val;
2631 }
2632 *lvalp = jiffies_to_clock_t(lval);
2633 }
2634 return 0;
2635}
2636
2637static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2638 int *valp,
2639 int write, void *data)
2640{
2641 if (write) {
2642 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2643 } else {
2644 int val = *valp;
2645 unsigned long lval;
2646 if (val < 0) {
2647 *negp = true;
2648 lval = (unsigned long)-val;
2649 } else {
2650 *negp = false;
2651 lval = (unsigned long)val;
2652 }
2653 *lvalp = jiffies_to_msecs(lval);
2654 }
2655 return 0;
2656}
2657
2658/**
2659 * proc_dointvec_jiffies - read a vector of integers as seconds
2660 * @table: the sysctl table
2661 * @write: %TRUE if this is a write to the sysctl file
2662 * @buffer: the user buffer
2663 * @lenp: the size of the user buffer
2664 * @ppos: file position
2665 *
2666 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2667 * values from/to the user buffer, treated as an ASCII string.
2668 * The values read are assumed to be in seconds, and are converted into
2669 * jiffies.
2670 *
2671 * Returns 0 on success.
2672 */
2673int proc_dointvec_jiffies(struct ctl_table *table, int write,
2674 void __user *buffer, size_t *lenp, loff_t *ppos)
2675{
2676 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2677 do_proc_dointvec_jiffies_conv,NULL);
2678}
2679
2680/**
2681 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2682 * @table: the sysctl table
2683 * @write: %TRUE if this is a write to the sysctl file
2684 * @buffer: the user buffer
2685 * @lenp: the size of the user buffer
2686 * @ppos: pointer to the file position
2687 *
2688 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2689 * values from/to the user buffer, treated as an ASCII string.
2690 * The values read are assumed to be in 1/USER_HZ seconds, and
2691 * are converted into jiffies.
2692 *
2693 * Returns 0 on success.
2694 */
2695int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2696 void __user *buffer, size_t *lenp, loff_t *ppos)
2697{
2698 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2699 do_proc_dointvec_userhz_jiffies_conv,NULL);
2700}
2701
2702/**
2703 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2704 * @table: the sysctl table
2705 * @write: %TRUE if this is a write to the sysctl file
2706 * @buffer: the user buffer
2707 * @lenp: the size of the user buffer
2708 * @ppos: file position
2709 * @ppos: the current position in the file
2710 *
2711 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2712 * values from/to the user buffer, treated as an ASCII string.
2713 * The values read are assumed to be in 1/1000 seconds, and
2714 * are converted into jiffies.
2715 *
2716 * Returns 0 on success.
2717 */
2718int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2719 void __user *buffer, size_t *lenp, loff_t *ppos)
2720{
2721 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2722 do_proc_dointvec_ms_jiffies_conv, NULL);
2723}
2724
2725static int proc_do_cad_pid(struct ctl_table *table, int write,
2726 void __user *buffer, size_t *lenp, loff_t *ppos)
2727{
2728 struct pid *new_pid;
2729 pid_t tmp;
2730 int r;
2731
2732 tmp = pid_vnr(cad_pid);
2733
2734 r = __do_proc_dointvec(&tmp, table, write, buffer,
2735 lenp, ppos, NULL, NULL);
2736 if (r || !write)
2737 return r;
2738
2739 new_pid = find_get_pid(tmp);
2740 if (!new_pid)
2741 return -ESRCH;
2742
2743 put_pid(xchg(&cad_pid, new_pid));
2744 return 0;
2745}
2746
2747/**
2748 * proc_do_large_bitmap - read/write from/to a large bitmap
2749 * @table: the sysctl table
2750 * @write: %TRUE if this is a write to the sysctl file
2751 * @buffer: the user buffer
2752 * @lenp: the size of the user buffer
2753 * @ppos: file position
2754 *
2755 * The bitmap is stored at table->data and the bitmap length (in bits)
2756 * in table->maxlen.
2757 *
2758 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2759 * large bitmaps may be represented in a compact manner. Writing into
2760 * the file will clear the bitmap then update it with the given input.
2761 *
2762 * Returns 0 on success.
2763 */
2764int proc_do_large_bitmap(struct ctl_table *table, int write,
2765 void __user *buffer, size_t *lenp, loff_t *ppos)
2766{
2767 int err = 0;
2768 bool first = 1;
2769 size_t left = *lenp;
2770 unsigned long bitmap_len = table->maxlen;
2771 unsigned long *bitmap = (unsigned long *) table->data;
2772 unsigned long *tmp_bitmap = NULL;
2773 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2774
2775 if (!bitmap_len || !left || (*ppos && !write)) {
2776 *lenp = 0;
2777 return 0;
2778 }
2779
2780 if (write) {
2781 unsigned long page = 0;
2782 char *kbuf;
2783
2784 if (left > PAGE_SIZE - 1)
2785 left = PAGE_SIZE - 1;
2786
2787 page = __get_free_page(GFP_TEMPORARY);
2788 kbuf = (char *) page;
2789 if (!kbuf)
2790 return -ENOMEM;
2791 if (copy_from_user(kbuf, buffer, left)) {
2792 free_page(page);
2793 return -EFAULT;
2794 }
2795 kbuf[left] = 0;
2796
2797 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2798 GFP_KERNEL);
2799 if (!tmp_bitmap) {
2800 free_page(page);
2801 return -ENOMEM;
2802 }
2803 proc_skip_char(&kbuf, &left, '\n');
2804 while (!err && left) {
2805 unsigned long val_a, val_b;
2806 bool neg;
2807
2808 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2809 sizeof(tr_a), &c);
2810 if (err)
2811 break;
2812 if (val_a >= bitmap_len || neg) {
2813 err = -EINVAL;
2814 break;
2815 }
2816
2817 val_b = val_a;
2818 if (left) {
2819 kbuf++;
2820 left--;
2821 }
2822
2823 if (c == '-') {
2824 err = proc_get_long(&kbuf, &left, &val_b,
2825 &neg, tr_b, sizeof(tr_b),
2826 &c);
2827 if (err)
2828 break;
2829 if (val_b >= bitmap_len || neg ||
2830 val_a > val_b) {
2831 err = -EINVAL;
2832 break;
2833 }
2834 if (left) {
2835 kbuf++;
2836 left--;
2837 }
2838 }
2839
2840 while (val_a <= val_b)
2841 set_bit(val_a++, tmp_bitmap);
2842
2843 first = 0;
2844 proc_skip_char(&kbuf, &left, '\n');
2845 }
2846 free_page(page);
2847 } else {
2848 unsigned long bit_a, bit_b = 0;
2849
2850 while (left) {
2851 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2852 if (bit_a >= bitmap_len)
2853 break;
2854 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2855 bit_a + 1) - 1;
2856
2857 if (!first) {
2858 err = proc_put_char(&buffer, &left, ',');
2859 if (err)
2860 break;
2861 }
2862 err = proc_put_long(&buffer, &left, bit_a, false);
2863 if (err)
2864 break;
2865 if (bit_a != bit_b) {
2866 err = proc_put_char(&buffer, &left, '-');
2867 if (err)
2868 break;
2869 err = proc_put_long(&buffer, &left, bit_b, false);
2870 if (err)
2871 break;
2872 }
2873
2874 first = 0; bit_b++;
2875 }
2876 if (!err)
2877 err = proc_put_char(&buffer, &left, '\n');
2878 }
2879
2880 if (!err) {
2881 if (write) {
2882 if (*ppos)
2883 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2884 else
2885 memcpy(bitmap, tmp_bitmap,
2886 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2887 }
2888 kfree(tmp_bitmap);
2889 *lenp -= left;
2890 *ppos += *lenp;
2891 return 0;
2892 } else {
2893 kfree(tmp_bitmap);
2894 return err;
2895 }
2896}
2897
2898#else /* CONFIG_PROC_FS */
2899
2900int proc_dostring(struct ctl_table *table, int write,
2901 void __user *buffer, size_t *lenp, loff_t *ppos)
2902{
2903 return -ENOSYS;
2904}
2905
2906int proc_dointvec(struct ctl_table *table, int write,
2907 void __user *buffer, size_t *lenp, loff_t *ppos)
2908{
2909 return -ENOSYS;
2910}
2911
2912int proc_dointvec_minmax(struct ctl_table *table, int write,
2913 void __user *buffer, size_t *lenp, loff_t *ppos)
2914{
2915 return -ENOSYS;
2916}
2917
2918int proc_dointvec_jiffies(struct ctl_table *table, int write,
2919 void __user *buffer, size_t *lenp, loff_t *ppos)
2920{
2921 return -ENOSYS;
2922}
2923
2924int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2925 void __user *buffer, size_t *lenp, loff_t *ppos)
2926{
2927 return -ENOSYS;
2928}
2929
2930int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2931 void __user *buffer, size_t *lenp, loff_t *ppos)
2932{
2933 return -ENOSYS;
2934}
2935
2936int proc_doulongvec_minmax(struct ctl_table *table, int write,
2937 void __user *buffer, size_t *lenp, loff_t *ppos)
2938{
2939 return -ENOSYS;
2940}
2941
2942int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2943 void __user *buffer,
2944 size_t *lenp, loff_t *ppos)
2945{
2946 return -ENOSYS;
2947}
2948
2949
2950#endif /* CONFIG_PROC_FS */
2951
2952/*
2953 * No sense putting this after each symbol definition, twice,
2954 * exception granted :-)
2955 */
2956EXPORT_SYMBOL(proc_dointvec);
2957EXPORT_SYMBOL(proc_dointvec_jiffies);
2958EXPORT_SYMBOL(proc_dointvec_minmax);
2959EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2960EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2961EXPORT_SYMBOL(proc_dostring);
2962EXPORT_SYMBOL(proc_doulongvec_minmax);
2963EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2964EXPORT_SYMBOL(register_sysctl_table);
2965EXPORT_SYMBOL(register_sysctl_paths);
2966EXPORT_SYMBOL(unregister_sysctl_table);
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