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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/aio.h>
23#include <linux/mm.h>
24#include <linux/swap.h>
25#include <linux/slab.h>
26#include <linux/sysctl.h>
27#include <linux/bitmap.h>
28#include <linux/signal.h>
29#include <linux/printk.h>
30#include <linux/proc_fs.h>
31#include <linux/security.h>
32#include <linux/ctype.h>
33#include <linux/kmemcheck.h>
34#include <linux/kmemleak.h>
35#include <linux/fs.h>
36#include <linux/init.h>
37#include <linux/kernel.h>
38#include <linux/kobject.h>
39#include <linux/net.h>
40#include <linux/sysrq.h>
41#include <linux/highuid.h>
42#include <linux/writeback.h>
43#include <linux/ratelimit.h>
44#include <linux/compaction.h>
45#include <linux/hugetlb.h>
46#include <linux/initrd.h>
47#include <linux/key.h>
48#include <linux/times.h>
49#include <linux/limits.h>
50#include <linux/dcache.h>
51#include <linux/dnotify.h>
52#include <linux/syscalls.h>
53#include <linux/vmstat.h>
54#include <linux/nfs_fs.h>
55#include <linux/acpi.h>
56#include <linux/reboot.h>
57#include <linux/ftrace.h>
58#include <linux/perf_event.h>
59#include <linux/kprobes.h>
60#include <linux/pipe_fs_i.h>
61#include <linux/oom.h>
62#include <linux/kmod.h>
63#include <linux/capability.h>
64#include <linux/binfmts.h>
65#include <linux/sched/sysctl.h>
66#include <linux/kexec.h>
67#include <linux/bpf.h>
68#include <linux/mount.h>
69
70#include <linux/uaccess.h>
71#include <asm/processor.h>
72
73#ifdef CONFIG_X86
74#include <asm/nmi.h>
75#include <asm/stacktrace.h>
76#include <asm/io.h>
77#endif
78#ifdef CONFIG_SPARC
79#include <asm/setup.h>
80#endif
81#ifdef CONFIG_BSD_PROCESS_ACCT
82#include <linux/acct.h>
83#endif
84#ifdef CONFIG_RT_MUTEXES
85#include <linux/rtmutex.h>
86#endif
87#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88#include <linux/lockdep.h>
89#endif
90#ifdef CONFIG_CHR_DEV_SG
91#include <scsi/sg.h>
92#endif
93
94#ifdef CONFIG_LOCKUP_DETECTOR
95#include <linux/nmi.h>
96#endif
97
98#if defined(CONFIG_SYSCTL)
99
100/* External variables not in a header file. */
101extern int suid_dumpable;
102#ifdef CONFIG_COREDUMP
103extern int core_uses_pid;
104extern char core_pattern[];
105extern unsigned int core_pipe_limit;
106#endif
107extern int pid_max;
108extern int pid_max_min, pid_max_max;
109extern int percpu_pagelist_fraction;
110extern int latencytop_enabled;
111extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
112#ifndef CONFIG_MMU
113extern int sysctl_nr_trim_pages;
114#endif
115
116/* Constants used for minimum and maximum */
117#ifdef CONFIG_LOCKUP_DETECTOR
118static int sixty = 60;
119#endif
120
121static int __maybe_unused neg_one = -1;
122
123static int zero;
124static int __maybe_unused one = 1;
125static int __maybe_unused two = 2;
126static int __maybe_unused four = 4;
127static unsigned long one_ul = 1;
128static int one_hundred = 100;
129static int one_thousand = 1000;
130#ifdef CONFIG_PRINTK
131static int ten_thousand = 10000;
132#endif
133#ifdef CONFIG_PERF_EVENTS
134static int six_hundred_forty_kb = 640 * 1024;
135#endif
136
137/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
138static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
139
140/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
141static int maxolduid = 65535;
142static int minolduid;
143
144static int ngroups_max = NGROUPS_MAX;
145static const int cap_last_cap = CAP_LAST_CAP;
146
147/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
148#ifdef CONFIG_DETECT_HUNG_TASK
149static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
150#endif
151
152#ifdef CONFIG_INOTIFY_USER
153#include <linux/inotify.h>
154#endif
155#ifdef CONFIG_SPARC
156#endif
157
158#ifdef __hppa__
159extern int pwrsw_enabled;
160#endif
161
162#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
163extern int unaligned_enabled;
164#endif
165
166#ifdef CONFIG_IA64
167extern int unaligned_dump_stack;
168#endif
169
170#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
171extern int no_unaligned_warning;
172#endif
173
174#ifdef CONFIG_PROC_SYSCTL
175
176#define SYSCTL_WRITES_LEGACY -1
177#define SYSCTL_WRITES_WARN 0
178#define SYSCTL_WRITES_STRICT 1
179
180static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
181
182static int proc_do_cad_pid(struct ctl_table *table, int write,
183 void __user *buffer, size_t *lenp, loff_t *ppos);
184static int proc_taint(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186#endif
187
188#ifdef CONFIG_PRINTK
189static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
191#endif
192
193static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
194 void __user *buffer, size_t *lenp, loff_t *ppos);
195#ifdef CONFIG_COREDUMP
196static int proc_dostring_coredump(struct ctl_table *table, int write,
197 void __user *buffer, size_t *lenp, loff_t *ppos);
198#endif
199
200#ifdef CONFIG_MAGIC_SYSRQ
201/* Note: sysrq code uses it's own private copy */
202static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
203
204static int sysrq_sysctl_handler(struct ctl_table *table, int write,
205 void __user *buffer, size_t *lenp,
206 loff_t *ppos)
207{
208 int error;
209
210 error = proc_dointvec(table, write, buffer, lenp, ppos);
211 if (error)
212 return error;
213
214 if (write)
215 sysrq_toggle_support(__sysrq_enabled);
216
217 return 0;
218}
219
220#endif
221
222static struct ctl_table kern_table[];
223static struct ctl_table vm_table[];
224static struct ctl_table fs_table[];
225static struct ctl_table debug_table[];
226static struct ctl_table dev_table[];
227extern struct ctl_table random_table[];
228#ifdef CONFIG_EPOLL
229extern struct ctl_table epoll_table[];
230#endif
231
232#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
233int sysctl_legacy_va_layout;
234#endif
235
236/* The default sysctl tables: */
237
238static struct ctl_table sysctl_base_table[] = {
239 {
240 .procname = "kernel",
241 .mode = 0555,
242 .child = kern_table,
243 },
244 {
245 .procname = "vm",
246 .mode = 0555,
247 .child = vm_table,
248 },
249 {
250 .procname = "fs",
251 .mode = 0555,
252 .child = fs_table,
253 },
254 {
255 .procname = "debug",
256 .mode = 0555,
257 .child = debug_table,
258 },
259 {
260 .procname = "dev",
261 .mode = 0555,
262 .child = dev_table,
263 },
264 { }
265};
266
267#ifdef CONFIG_SCHED_DEBUG
268static int min_sched_granularity_ns = 100000; /* 100 usecs */
269static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
270static int min_wakeup_granularity_ns; /* 0 usecs */
271static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
272#ifdef CONFIG_SMP
273static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
274static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
275#endif /* CONFIG_SMP */
276#endif /* CONFIG_SCHED_DEBUG */
277
278#ifdef CONFIG_COMPACTION
279static int min_extfrag_threshold;
280static int max_extfrag_threshold = 1000;
281#endif
282
283static struct ctl_table kern_table[] = {
284 {
285 .procname = "sched_child_runs_first",
286 .data = &sysctl_sched_child_runs_first,
287 .maxlen = sizeof(unsigned int),
288 .mode = 0644,
289 .proc_handler = proc_dointvec,
290 },
291#ifdef CONFIG_SCHED_DEBUG
292 {
293 .procname = "sched_min_granularity_ns",
294 .data = &sysctl_sched_min_granularity,
295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
297 .proc_handler = sched_proc_update_handler,
298 .extra1 = &min_sched_granularity_ns,
299 .extra2 = &max_sched_granularity_ns,
300 },
301 {
302 .procname = "sched_latency_ns",
303 .data = &sysctl_sched_latency,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
306 .proc_handler = sched_proc_update_handler,
307 .extra1 = &min_sched_granularity_ns,
308 .extra2 = &max_sched_granularity_ns,
309 },
310 {
311 .procname = "sched_wakeup_granularity_ns",
312 .data = &sysctl_sched_wakeup_granularity,
313 .maxlen = sizeof(unsigned int),
314 .mode = 0644,
315 .proc_handler = sched_proc_update_handler,
316 .extra1 = &min_wakeup_granularity_ns,
317 .extra2 = &max_wakeup_granularity_ns,
318 },
319#ifdef CONFIG_SMP
320 {
321 .procname = "sched_tunable_scaling",
322 .data = &sysctl_sched_tunable_scaling,
323 .maxlen = sizeof(enum sched_tunable_scaling),
324 .mode = 0644,
325 .proc_handler = sched_proc_update_handler,
326 .extra1 = &min_sched_tunable_scaling,
327 .extra2 = &max_sched_tunable_scaling,
328 },
329 {
330 .procname = "sched_migration_cost_ns",
331 .data = &sysctl_sched_migration_cost,
332 .maxlen = sizeof(unsigned int),
333 .mode = 0644,
334 .proc_handler = proc_dointvec,
335 },
336 {
337 .procname = "sched_nr_migrate",
338 .data = &sysctl_sched_nr_migrate,
339 .maxlen = sizeof(unsigned int),
340 .mode = 0644,
341 .proc_handler = proc_dointvec,
342 },
343 {
344 .procname = "sched_time_avg_ms",
345 .data = &sysctl_sched_time_avg,
346 .maxlen = sizeof(unsigned int),
347 .mode = 0644,
348 .proc_handler = proc_dointvec,
349 },
350#ifdef CONFIG_SCHEDSTATS
351 {
352 .procname = "sched_schedstats",
353 .data = NULL,
354 .maxlen = sizeof(unsigned int),
355 .mode = 0644,
356 .proc_handler = sysctl_schedstats,
357 .extra1 = &zero,
358 .extra2 = &one,
359 },
360#endif /* CONFIG_SCHEDSTATS */
361#endif /* CONFIG_SMP */
362#ifdef CONFIG_NUMA_BALANCING
363 {
364 .procname = "numa_balancing_scan_delay_ms",
365 .data = &sysctl_numa_balancing_scan_delay,
366 .maxlen = sizeof(unsigned int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec,
369 },
370 {
371 .procname = "numa_balancing_scan_period_min_ms",
372 .data = &sysctl_numa_balancing_scan_period_min,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
377 {
378 .procname = "numa_balancing_scan_period_max_ms",
379 .data = &sysctl_numa_balancing_scan_period_max,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384 {
385 .procname = "numa_balancing_scan_size_mb",
386 .data = &sysctl_numa_balancing_scan_size,
387 .maxlen = sizeof(unsigned int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec_minmax,
390 .extra1 = &one,
391 },
392 {
393 .procname = "numa_balancing",
394 .data = NULL, /* filled in by handler */
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
397 .proc_handler = sysctl_numa_balancing,
398 .extra1 = &zero,
399 .extra2 = &one,
400 },
401#endif /* CONFIG_NUMA_BALANCING */
402#endif /* CONFIG_SCHED_DEBUG */
403 {
404 .procname = "sched_rt_period_us",
405 .data = &sysctl_sched_rt_period,
406 .maxlen = sizeof(unsigned int),
407 .mode = 0644,
408 .proc_handler = sched_rt_handler,
409 },
410 {
411 .procname = "sched_rt_runtime_us",
412 .data = &sysctl_sched_rt_runtime,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = sched_rt_handler,
416 },
417 {
418 .procname = "sched_rr_timeslice_ms",
419 .data = &sched_rr_timeslice,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = sched_rr_handler,
423 },
424#ifdef CONFIG_SCHED_AUTOGROUP
425 {
426 .procname = "sched_autogroup_enabled",
427 .data = &sysctl_sched_autogroup_enabled,
428 .maxlen = sizeof(unsigned int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec_minmax,
431 .extra1 = &zero,
432 .extra2 = &one,
433 },
434#endif
435#ifdef CONFIG_CFS_BANDWIDTH
436 {
437 .procname = "sched_cfs_bandwidth_slice_us",
438 .data = &sysctl_sched_cfs_bandwidth_slice,
439 .maxlen = sizeof(unsigned int),
440 .mode = 0644,
441 .proc_handler = proc_dointvec_minmax,
442 .extra1 = &one,
443 },
444#endif
445#ifdef CONFIG_PROVE_LOCKING
446 {
447 .procname = "prove_locking",
448 .data = &prove_locking,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec,
452 },
453#endif
454#ifdef CONFIG_LOCK_STAT
455 {
456 .procname = "lock_stat",
457 .data = &lock_stat,
458 .maxlen = sizeof(int),
459 .mode = 0644,
460 .proc_handler = proc_dointvec,
461 },
462#endif
463 {
464 .procname = "panic",
465 .data = &panic_timeout,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec,
469 },
470#ifdef CONFIG_COREDUMP
471 {
472 .procname = "core_uses_pid",
473 .data = &core_uses_pid,
474 .maxlen = sizeof(int),
475 .mode = 0644,
476 .proc_handler = proc_dointvec,
477 },
478 {
479 .procname = "core_pattern",
480 .data = core_pattern,
481 .maxlen = CORENAME_MAX_SIZE,
482 .mode = 0644,
483 .proc_handler = proc_dostring_coredump,
484 },
485 {
486 .procname = "core_pipe_limit",
487 .data = &core_pipe_limit,
488 .maxlen = sizeof(unsigned int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492#endif
493#ifdef CONFIG_PROC_SYSCTL
494 {
495 .procname = "tainted",
496 .maxlen = sizeof(long),
497 .mode = 0644,
498 .proc_handler = proc_taint,
499 },
500 {
501 .procname = "sysctl_writes_strict",
502 .data = &sysctl_writes_strict,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec_minmax,
506 .extra1 = &neg_one,
507 .extra2 = &one,
508 },
509#endif
510#ifdef CONFIG_LATENCYTOP
511 {
512 .procname = "latencytop",
513 .data = &latencytop_enabled,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = sysctl_latencytop,
517 },
518#endif
519#ifdef CONFIG_BLK_DEV_INITRD
520 {
521 .procname = "real-root-dev",
522 .data = &real_root_dev,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec,
526 },
527#endif
528 {
529 .procname = "print-fatal-signals",
530 .data = &print_fatal_signals,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec,
534 },
535#ifdef CONFIG_SPARC
536 {
537 .procname = "reboot-cmd",
538 .data = reboot_command,
539 .maxlen = 256,
540 .mode = 0644,
541 .proc_handler = proc_dostring,
542 },
543 {
544 .procname = "stop-a",
545 .data = &stop_a_enabled,
546 .maxlen = sizeof (int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec,
549 },
550 {
551 .procname = "scons-poweroff",
552 .data = &scons_pwroff,
553 .maxlen = sizeof (int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec,
556 },
557#endif
558#ifdef CONFIG_SPARC64
559 {
560 .procname = "tsb-ratio",
561 .data = &sysctl_tsb_ratio,
562 .maxlen = sizeof (int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566#endif
567#ifdef __hppa__
568 {
569 .procname = "soft-power",
570 .data = &pwrsw_enabled,
571 .maxlen = sizeof (int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec,
574 },
575#endif
576#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
577 {
578 .procname = "unaligned-trap",
579 .data = &unaligned_enabled,
580 .maxlen = sizeof (int),
581 .mode = 0644,
582 .proc_handler = proc_dointvec,
583 },
584#endif
585 {
586 .procname = "ctrl-alt-del",
587 .data = &C_A_D,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = proc_dointvec,
591 },
592#ifdef CONFIG_FUNCTION_TRACER
593 {
594 .procname = "ftrace_enabled",
595 .data = &ftrace_enabled,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = ftrace_enable_sysctl,
599 },
600#endif
601#ifdef CONFIG_STACK_TRACER
602 {
603 .procname = "stack_tracer_enabled",
604 .data = &stack_tracer_enabled,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = stack_trace_sysctl,
608 },
609#endif
610#ifdef CONFIG_TRACING
611 {
612 .procname = "ftrace_dump_on_oops",
613 .data = &ftrace_dump_on_oops,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 .proc_handler = proc_dointvec,
617 },
618 {
619 .procname = "traceoff_on_warning",
620 .data = &__disable_trace_on_warning,
621 .maxlen = sizeof(__disable_trace_on_warning),
622 .mode = 0644,
623 .proc_handler = proc_dointvec,
624 },
625 {
626 .procname = "tracepoint_printk",
627 .data = &tracepoint_printk,
628 .maxlen = sizeof(tracepoint_printk),
629 .mode = 0644,
630 .proc_handler = tracepoint_printk_sysctl,
631 },
632#endif
633#ifdef CONFIG_KEXEC_CORE
634 {
635 .procname = "kexec_load_disabled",
636 .data = &kexec_load_disabled,
637 .maxlen = sizeof(int),
638 .mode = 0644,
639 /* only handle a transition from default "0" to "1" */
640 .proc_handler = proc_dointvec_minmax,
641 .extra1 = &one,
642 .extra2 = &one,
643 },
644#endif
645#ifdef CONFIG_MODULES
646 {
647 .procname = "modprobe",
648 .data = &modprobe_path,
649 .maxlen = KMOD_PATH_LEN,
650 .mode = 0644,
651 .proc_handler = proc_dostring,
652 },
653 {
654 .procname = "modules_disabled",
655 .data = &modules_disabled,
656 .maxlen = sizeof(int),
657 .mode = 0644,
658 /* only handle a transition from default "0" to "1" */
659 .proc_handler = proc_dointvec_minmax,
660 .extra1 = &one,
661 .extra2 = &one,
662 },
663#endif
664#ifdef CONFIG_UEVENT_HELPER
665 {
666 .procname = "hotplug",
667 .data = &uevent_helper,
668 .maxlen = UEVENT_HELPER_PATH_LEN,
669 .mode = 0644,
670 .proc_handler = proc_dostring,
671 },
672#endif
673#ifdef CONFIG_CHR_DEV_SG
674 {
675 .procname = "sg-big-buff",
676 .data = &sg_big_buff,
677 .maxlen = sizeof (int),
678 .mode = 0444,
679 .proc_handler = proc_dointvec,
680 },
681#endif
682#ifdef CONFIG_BSD_PROCESS_ACCT
683 {
684 .procname = "acct",
685 .data = &acct_parm,
686 .maxlen = 3*sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec,
689 },
690#endif
691#ifdef CONFIG_MAGIC_SYSRQ
692 {
693 .procname = "sysrq",
694 .data = &__sysrq_enabled,
695 .maxlen = sizeof (int),
696 .mode = 0644,
697 .proc_handler = sysrq_sysctl_handler,
698 },
699#endif
700#ifdef CONFIG_PROC_SYSCTL
701 {
702 .procname = "cad_pid",
703 .data = NULL,
704 .maxlen = sizeof (int),
705 .mode = 0600,
706 .proc_handler = proc_do_cad_pid,
707 },
708#endif
709 {
710 .procname = "threads-max",
711 .data = NULL,
712 .maxlen = sizeof(int),
713 .mode = 0644,
714 .proc_handler = sysctl_max_threads,
715 },
716 {
717 .procname = "random",
718 .mode = 0555,
719 .child = random_table,
720 },
721 {
722 .procname = "usermodehelper",
723 .mode = 0555,
724 .child = usermodehelper_table,
725 },
726 {
727 .procname = "overflowuid",
728 .data = &overflowuid,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec_minmax,
732 .extra1 = &minolduid,
733 .extra2 = &maxolduid,
734 },
735 {
736 .procname = "overflowgid",
737 .data = &overflowgid,
738 .maxlen = sizeof(int),
739 .mode = 0644,
740 .proc_handler = proc_dointvec_minmax,
741 .extra1 = &minolduid,
742 .extra2 = &maxolduid,
743 },
744#ifdef CONFIG_S390
745#ifdef CONFIG_MATHEMU
746 {
747 .procname = "ieee_emulation_warnings",
748 .data = &sysctl_ieee_emulation_warnings,
749 .maxlen = sizeof(int),
750 .mode = 0644,
751 .proc_handler = proc_dointvec,
752 },
753#endif
754 {
755 .procname = "userprocess_debug",
756 .data = &show_unhandled_signals,
757 .maxlen = sizeof(int),
758 .mode = 0644,
759 .proc_handler = proc_dointvec,
760 },
761#endif
762 {
763 .procname = "pid_max",
764 .data = &pid_max,
765 .maxlen = sizeof (int),
766 .mode = 0644,
767 .proc_handler = proc_dointvec_minmax,
768 .extra1 = &pid_max_min,
769 .extra2 = &pid_max_max,
770 },
771 {
772 .procname = "panic_on_oops",
773 .data = &panic_on_oops,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec,
777 },
778#if defined CONFIG_PRINTK
779 {
780 .procname = "printk",
781 .data = &console_loglevel,
782 .maxlen = 4*sizeof(int),
783 .mode = 0644,
784 .proc_handler = proc_dointvec,
785 },
786 {
787 .procname = "printk_ratelimit",
788 .data = &printk_ratelimit_state.interval,
789 .maxlen = sizeof(int),
790 .mode = 0644,
791 .proc_handler = proc_dointvec_jiffies,
792 },
793 {
794 .procname = "printk_ratelimit_burst",
795 .data = &printk_ratelimit_state.burst,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec,
799 },
800 {
801 .procname = "printk_delay",
802 .data = &printk_delay_msec,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec_minmax,
806 .extra1 = &zero,
807 .extra2 = &ten_thousand,
808 },
809 {
810 .procname = "printk_devkmsg",
811 .data = devkmsg_log_str,
812 .maxlen = DEVKMSG_STR_MAX_SIZE,
813 .mode = 0644,
814 .proc_handler = devkmsg_sysctl_set_loglvl,
815 },
816 {
817 .procname = "dmesg_restrict",
818 .data = &dmesg_restrict,
819 .maxlen = sizeof(int),
820 .mode = 0644,
821 .proc_handler = proc_dointvec_minmax_sysadmin,
822 .extra1 = &zero,
823 .extra2 = &one,
824 },
825 {
826 .procname = "kptr_restrict",
827 .data = &kptr_restrict,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec_minmax_sysadmin,
831 .extra1 = &zero,
832 .extra2 = &two,
833 },
834#endif
835 {
836 .procname = "ngroups_max",
837 .data = &ngroups_max,
838 .maxlen = sizeof (int),
839 .mode = 0444,
840 .proc_handler = proc_dointvec,
841 },
842 {
843 .procname = "cap_last_cap",
844 .data = (void *)&cap_last_cap,
845 .maxlen = sizeof(int),
846 .mode = 0444,
847 .proc_handler = proc_dointvec,
848 },
849#if defined(CONFIG_LOCKUP_DETECTOR)
850 {
851 .procname = "watchdog",
852 .data = &watchdog_user_enabled,
853 .maxlen = sizeof (int),
854 .mode = 0644,
855 .proc_handler = proc_watchdog,
856 .extra1 = &zero,
857 .extra2 = &one,
858 },
859 {
860 .procname = "watchdog_thresh",
861 .data = &watchdog_thresh,
862 .maxlen = sizeof(int),
863 .mode = 0644,
864 .proc_handler = proc_watchdog_thresh,
865 .extra1 = &zero,
866 .extra2 = &sixty,
867 },
868 {
869 .procname = "nmi_watchdog",
870 .data = &nmi_watchdog_enabled,
871 .maxlen = sizeof (int),
872 .mode = 0644,
873 .proc_handler = proc_nmi_watchdog,
874 .extra1 = &zero,
875#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
876 .extra2 = &one,
877#else
878 .extra2 = &zero,
879#endif
880 },
881 {
882 .procname = "soft_watchdog",
883 .data = &soft_watchdog_enabled,
884 .maxlen = sizeof (int),
885 .mode = 0644,
886 .proc_handler = proc_soft_watchdog,
887 .extra1 = &zero,
888 .extra2 = &one,
889 },
890 {
891 .procname = "watchdog_cpumask",
892 .data = &watchdog_cpumask_bits,
893 .maxlen = NR_CPUS,
894 .mode = 0644,
895 .proc_handler = proc_watchdog_cpumask,
896 },
897 {
898 .procname = "softlockup_panic",
899 .data = &softlockup_panic,
900 .maxlen = sizeof(int),
901 .mode = 0644,
902 .proc_handler = proc_dointvec_minmax,
903 .extra1 = &zero,
904 .extra2 = &one,
905 },
906#ifdef CONFIG_HARDLOCKUP_DETECTOR
907 {
908 .procname = "hardlockup_panic",
909 .data = &hardlockup_panic,
910 .maxlen = sizeof(int),
911 .mode = 0644,
912 .proc_handler = proc_dointvec_minmax,
913 .extra1 = &zero,
914 .extra2 = &one,
915 },
916#endif
917#ifdef CONFIG_SMP
918 {
919 .procname = "softlockup_all_cpu_backtrace",
920 .data = &sysctl_softlockup_all_cpu_backtrace,
921 .maxlen = sizeof(int),
922 .mode = 0644,
923 .proc_handler = proc_dointvec_minmax,
924 .extra1 = &zero,
925 .extra2 = &one,
926 },
927 {
928 .procname = "hardlockup_all_cpu_backtrace",
929 .data = &sysctl_hardlockup_all_cpu_backtrace,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_dointvec_minmax,
933 .extra1 = &zero,
934 .extra2 = &one,
935 },
936#endif /* CONFIG_SMP */
937#endif
938#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
939 {
940 .procname = "unknown_nmi_panic",
941 .data = &unknown_nmi_panic,
942 .maxlen = sizeof (int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec,
945 },
946#endif
947#if defined(CONFIG_X86)
948 {
949 .procname = "panic_on_unrecovered_nmi",
950 .data = &panic_on_unrecovered_nmi,
951 .maxlen = sizeof(int),
952 .mode = 0644,
953 .proc_handler = proc_dointvec,
954 },
955 {
956 .procname = "panic_on_io_nmi",
957 .data = &panic_on_io_nmi,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec,
961 },
962#ifdef CONFIG_DEBUG_STACKOVERFLOW
963 {
964 .procname = "panic_on_stackoverflow",
965 .data = &sysctl_panic_on_stackoverflow,
966 .maxlen = sizeof(int),
967 .mode = 0644,
968 .proc_handler = proc_dointvec,
969 },
970#endif
971 {
972 .procname = "bootloader_type",
973 .data = &bootloader_type,
974 .maxlen = sizeof (int),
975 .mode = 0444,
976 .proc_handler = proc_dointvec,
977 },
978 {
979 .procname = "bootloader_version",
980 .data = &bootloader_version,
981 .maxlen = sizeof (int),
982 .mode = 0444,
983 .proc_handler = proc_dointvec,
984 },
985 {
986 .procname = "io_delay_type",
987 .data = &io_delay_type,
988 .maxlen = sizeof(int),
989 .mode = 0644,
990 .proc_handler = proc_dointvec,
991 },
992#endif
993#if defined(CONFIG_MMU)
994 {
995 .procname = "randomize_va_space",
996 .data = &randomize_va_space,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec,
1000 },
1001#endif
1002#if defined(CONFIG_S390) && defined(CONFIG_SMP)
1003 {
1004 .procname = "spin_retry",
1005 .data = &spin_retry,
1006 .maxlen = sizeof (int),
1007 .mode = 0644,
1008 .proc_handler = proc_dointvec,
1009 },
1010#endif
1011#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1012 {
1013 .procname = "acpi_video_flags",
1014 .data = &acpi_realmode_flags,
1015 .maxlen = sizeof (unsigned long),
1016 .mode = 0644,
1017 .proc_handler = proc_doulongvec_minmax,
1018 },
1019#endif
1020#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1021 {
1022 .procname = "ignore-unaligned-usertrap",
1023 .data = &no_unaligned_warning,
1024 .maxlen = sizeof (int),
1025 .mode = 0644,
1026 .proc_handler = proc_dointvec,
1027 },
1028#endif
1029#ifdef CONFIG_IA64
1030 {
1031 .procname = "unaligned-dump-stack",
1032 .data = &unaligned_dump_stack,
1033 .maxlen = sizeof (int),
1034 .mode = 0644,
1035 .proc_handler = proc_dointvec,
1036 },
1037#endif
1038#ifdef CONFIG_DETECT_HUNG_TASK
1039 {
1040 .procname = "hung_task_panic",
1041 .data = &sysctl_hung_task_panic,
1042 .maxlen = sizeof(int),
1043 .mode = 0644,
1044 .proc_handler = proc_dointvec_minmax,
1045 .extra1 = &zero,
1046 .extra2 = &one,
1047 },
1048 {
1049 .procname = "hung_task_check_count",
1050 .data = &sysctl_hung_task_check_count,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = proc_dointvec_minmax,
1054 .extra1 = &zero,
1055 },
1056 {
1057 .procname = "hung_task_timeout_secs",
1058 .data = &sysctl_hung_task_timeout_secs,
1059 .maxlen = sizeof(unsigned long),
1060 .mode = 0644,
1061 .proc_handler = proc_dohung_task_timeout_secs,
1062 .extra2 = &hung_task_timeout_max,
1063 },
1064 {
1065 .procname = "hung_task_warnings",
1066 .data = &sysctl_hung_task_warnings,
1067 .maxlen = sizeof(int),
1068 .mode = 0644,
1069 .proc_handler = proc_dointvec_minmax,
1070 .extra1 = &neg_one,
1071 },
1072#endif
1073#ifdef CONFIG_RT_MUTEXES
1074 {
1075 .procname = "max_lock_depth",
1076 .data = &max_lock_depth,
1077 .maxlen = sizeof(int),
1078 .mode = 0644,
1079 .proc_handler = proc_dointvec,
1080 },
1081#endif
1082 {
1083 .procname = "poweroff_cmd",
1084 .data = &poweroff_cmd,
1085 .maxlen = POWEROFF_CMD_PATH_LEN,
1086 .mode = 0644,
1087 .proc_handler = proc_dostring,
1088 },
1089#ifdef CONFIG_KEYS
1090 {
1091 .procname = "keys",
1092 .mode = 0555,
1093 .child = key_sysctls,
1094 },
1095#endif
1096#ifdef CONFIG_PERF_EVENTS
1097 /*
1098 * User-space scripts rely on the existence of this file
1099 * as a feature check for perf_events being enabled.
1100 *
1101 * So it's an ABI, do not remove!
1102 */
1103 {
1104 .procname = "perf_event_paranoid",
1105 .data = &sysctl_perf_event_paranoid,
1106 .maxlen = sizeof(sysctl_perf_event_paranoid),
1107 .mode = 0644,
1108 .proc_handler = proc_dointvec,
1109 },
1110 {
1111 .procname = "perf_event_mlock_kb",
1112 .data = &sysctl_perf_event_mlock,
1113 .maxlen = sizeof(sysctl_perf_event_mlock),
1114 .mode = 0644,
1115 .proc_handler = proc_dointvec,
1116 },
1117 {
1118 .procname = "perf_event_max_sample_rate",
1119 .data = &sysctl_perf_event_sample_rate,
1120 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1121 .mode = 0644,
1122 .proc_handler = perf_proc_update_handler,
1123 .extra1 = &one,
1124 },
1125 {
1126 .procname = "perf_cpu_time_max_percent",
1127 .data = &sysctl_perf_cpu_time_max_percent,
1128 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1129 .mode = 0644,
1130 .proc_handler = perf_cpu_time_max_percent_handler,
1131 .extra1 = &zero,
1132 .extra2 = &one_hundred,
1133 },
1134 {
1135 .procname = "perf_event_max_stack",
1136 .data = &sysctl_perf_event_max_stack,
1137 .maxlen = sizeof(sysctl_perf_event_max_stack),
1138 .mode = 0644,
1139 .proc_handler = perf_event_max_stack_handler,
1140 .extra1 = &zero,
1141 .extra2 = &six_hundred_forty_kb,
1142 },
1143 {
1144 .procname = "perf_event_max_contexts_per_stack",
1145 .data = &sysctl_perf_event_max_contexts_per_stack,
1146 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1147 .mode = 0644,
1148 .proc_handler = perf_event_max_stack_handler,
1149 .extra1 = &zero,
1150 .extra2 = &one_thousand,
1151 },
1152#endif
1153#ifdef CONFIG_KMEMCHECK
1154 {
1155 .procname = "kmemcheck",
1156 .data = &kmemcheck_enabled,
1157 .maxlen = sizeof(int),
1158 .mode = 0644,
1159 .proc_handler = proc_dointvec,
1160 },
1161#endif
1162 {
1163 .procname = "panic_on_warn",
1164 .data = &panic_on_warn,
1165 .maxlen = sizeof(int),
1166 .mode = 0644,
1167 .proc_handler = proc_dointvec_minmax,
1168 .extra1 = &zero,
1169 .extra2 = &one,
1170 },
1171#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1172 {
1173 .procname = "timer_migration",
1174 .data = &sysctl_timer_migration,
1175 .maxlen = sizeof(unsigned int),
1176 .mode = 0644,
1177 .proc_handler = timer_migration_handler,
1178 },
1179#endif
1180#ifdef CONFIG_BPF_SYSCALL
1181 {
1182 .procname = "unprivileged_bpf_disabled",
1183 .data = &sysctl_unprivileged_bpf_disabled,
1184 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1185 .mode = 0644,
1186 /* only handle a transition from default "0" to "1" */
1187 .proc_handler = proc_dointvec_minmax,
1188 .extra1 = &one,
1189 .extra2 = &one,
1190 },
1191#endif
1192#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1193 {
1194 .procname = "panic_on_rcu_stall",
1195 .data = &sysctl_panic_on_rcu_stall,
1196 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_minmax,
1199 .extra1 = &zero,
1200 .extra2 = &one,
1201 },
1202#endif
1203 { }
1204};
1205
1206static struct ctl_table vm_table[] = {
1207 {
1208 .procname = "overcommit_memory",
1209 .data = &sysctl_overcommit_memory,
1210 .maxlen = sizeof(sysctl_overcommit_memory),
1211 .mode = 0644,
1212 .proc_handler = proc_dointvec_minmax,
1213 .extra1 = &zero,
1214 .extra2 = &two,
1215 },
1216 {
1217 .procname = "panic_on_oom",
1218 .data = &sysctl_panic_on_oom,
1219 .maxlen = sizeof(sysctl_panic_on_oom),
1220 .mode = 0644,
1221 .proc_handler = proc_dointvec_minmax,
1222 .extra1 = &zero,
1223 .extra2 = &two,
1224 },
1225 {
1226 .procname = "oom_kill_allocating_task",
1227 .data = &sysctl_oom_kill_allocating_task,
1228 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1229 .mode = 0644,
1230 .proc_handler = proc_dointvec,
1231 },
1232 {
1233 .procname = "oom_dump_tasks",
1234 .data = &sysctl_oom_dump_tasks,
1235 .maxlen = sizeof(sysctl_oom_dump_tasks),
1236 .mode = 0644,
1237 .proc_handler = proc_dointvec,
1238 },
1239 {
1240 .procname = "overcommit_ratio",
1241 .data = &sysctl_overcommit_ratio,
1242 .maxlen = sizeof(sysctl_overcommit_ratio),
1243 .mode = 0644,
1244 .proc_handler = overcommit_ratio_handler,
1245 },
1246 {
1247 .procname = "overcommit_kbytes",
1248 .data = &sysctl_overcommit_kbytes,
1249 .maxlen = sizeof(sysctl_overcommit_kbytes),
1250 .mode = 0644,
1251 .proc_handler = overcommit_kbytes_handler,
1252 },
1253 {
1254 .procname = "page-cluster",
1255 .data = &page_cluster,
1256 .maxlen = sizeof(int),
1257 .mode = 0644,
1258 .proc_handler = proc_dointvec_minmax,
1259 .extra1 = &zero,
1260 },
1261 {
1262 .procname = "dirty_background_ratio",
1263 .data = &dirty_background_ratio,
1264 .maxlen = sizeof(dirty_background_ratio),
1265 .mode = 0644,
1266 .proc_handler = dirty_background_ratio_handler,
1267 .extra1 = &zero,
1268 .extra2 = &one_hundred,
1269 },
1270 {
1271 .procname = "dirty_background_bytes",
1272 .data = &dirty_background_bytes,
1273 .maxlen = sizeof(dirty_background_bytes),
1274 .mode = 0644,
1275 .proc_handler = dirty_background_bytes_handler,
1276 .extra1 = &one_ul,
1277 },
1278 {
1279 .procname = "dirty_ratio",
1280 .data = &vm_dirty_ratio,
1281 .maxlen = sizeof(vm_dirty_ratio),
1282 .mode = 0644,
1283 .proc_handler = dirty_ratio_handler,
1284 .extra1 = &zero,
1285 .extra2 = &one_hundred,
1286 },
1287 {
1288 .procname = "dirty_bytes",
1289 .data = &vm_dirty_bytes,
1290 .maxlen = sizeof(vm_dirty_bytes),
1291 .mode = 0644,
1292 .proc_handler = dirty_bytes_handler,
1293 .extra1 = &dirty_bytes_min,
1294 },
1295 {
1296 .procname = "dirty_writeback_centisecs",
1297 .data = &dirty_writeback_interval,
1298 .maxlen = sizeof(dirty_writeback_interval),
1299 .mode = 0644,
1300 .proc_handler = dirty_writeback_centisecs_handler,
1301 },
1302 {
1303 .procname = "dirty_expire_centisecs",
1304 .data = &dirty_expire_interval,
1305 .maxlen = sizeof(dirty_expire_interval),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec_minmax,
1308 .extra1 = &zero,
1309 },
1310 {
1311 .procname = "dirtytime_expire_seconds",
1312 .data = &dirtytime_expire_interval,
1313 .maxlen = sizeof(dirty_expire_interval),
1314 .mode = 0644,
1315 .proc_handler = dirtytime_interval_handler,
1316 .extra1 = &zero,
1317 },
1318 {
1319 .procname = "nr_pdflush_threads",
1320 .mode = 0444 /* read-only */,
1321 .proc_handler = pdflush_proc_obsolete,
1322 },
1323 {
1324 .procname = "swappiness",
1325 .data = &vm_swappiness,
1326 .maxlen = sizeof(vm_swappiness),
1327 .mode = 0644,
1328 .proc_handler = proc_dointvec_minmax,
1329 .extra1 = &zero,
1330 .extra2 = &one_hundred,
1331 },
1332#ifdef CONFIG_HUGETLB_PAGE
1333 {
1334 .procname = "nr_hugepages",
1335 .data = NULL,
1336 .maxlen = sizeof(unsigned long),
1337 .mode = 0644,
1338 .proc_handler = hugetlb_sysctl_handler,
1339 },
1340#ifdef CONFIG_NUMA
1341 {
1342 .procname = "nr_hugepages_mempolicy",
1343 .data = NULL,
1344 .maxlen = sizeof(unsigned long),
1345 .mode = 0644,
1346 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1347 },
1348#endif
1349 {
1350 .procname = "hugetlb_shm_group",
1351 .data = &sysctl_hugetlb_shm_group,
1352 .maxlen = sizeof(gid_t),
1353 .mode = 0644,
1354 .proc_handler = proc_dointvec,
1355 },
1356 {
1357 .procname = "hugepages_treat_as_movable",
1358 .data = &hugepages_treat_as_movable,
1359 .maxlen = sizeof(int),
1360 .mode = 0644,
1361 .proc_handler = proc_dointvec,
1362 },
1363 {
1364 .procname = "nr_overcommit_hugepages",
1365 .data = NULL,
1366 .maxlen = sizeof(unsigned long),
1367 .mode = 0644,
1368 .proc_handler = hugetlb_overcommit_handler,
1369 },
1370#endif
1371 {
1372 .procname = "lowmem_reserve_ratio",
1373 .data = &sysctl_lowmem_reserve_ratio,
1374 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1375 .mode = 0644,
1376 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1377 },
1378 {
1379 .procname = "drop_caches",
1380 .data = &sysctl_drop_caches,
1381 .maxlen = sizeof(int),
1382 .mode = 0644,
1383 .proc_handler = drop_caches_sysctl_handler,
1384 .extra1 = &one,
1385 .extra2 = &four,
1386 },
1387#ifdef CONFIG_COMPACTION
1388 {
1389 .procname = "compact_memory",
1390 .data = &sysctl_compact_memory,
1391 .maxlen = sizeof(int),
1392 .mode = 0200,
1393 .proc_handler = sysctl_compaction_handler,
1394 },
1395 {
1396 .procname = "extfrag_threshold",
1397 .data = &sysctl_extfrag_threshold,
1398 .maxlen = sizeof(int),
1399 .mode = 0644,
1400 .proc_handler = sysctl_extfrag_handler,
1401 .extra1 = &min_extfrag_threshold,
1402 .extra2 = &max_extfrag_threshold,
1403 },
1404 {
1405 .procname = "compact_unevictable_allowed",
1406 .data = &sysctl_compact_unevictable_allowed,
1407 .maxlen = sizeof(int),
1408 .mode = 0644,
1409 .proc_handler = proc_dointvec,
1410 .extra1 = &zero,
1411 .extra2 = &one,
1412 },
1413
1414#endif /* CONFIG_COMPACTION */
1415 {
1416 .procname = "min_free_kbytes",
1417 .data = &min_free_kbytes,
1418 .maxlen = sizeof(min_free_kbytes),
1419 .mode = 0644,
1420 .proc_handler = min_free_kbytes_sysctl_handler,
1421 .extra1 = &zero,
1422 },
1423 {
1424 .procname = "watermark_scale_factor",
1425 .data = &watermark_scale_factor,
1426 .maxlen = sizeof(watermark_scale_factor),
1427 .mode = 0644,
1428 .proc_handler = watermark_scale_factor_sysctl_handler,
1429 .extra1 = &one,
1430 .extra2 = &one_thousand,
1431 },
1432 {
1433 .procname = "percpu_pagelist_fraction",
1434 .data = &percpu_pagelist_fraction,
1435 .maxlen = sizeof(percpu_pagelist_fraction),
1436 .mode = 0644,
1437 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1438 .extra1 = &zero,
1439 },
1440#ifdef CONFIG_MMU
1441 {
1442 .procname = "max_map_count",
1443 .data = &sysctl_max_map_count,
1444 .maxlen = sizeof(sysctl_max_map_count),
1445 .mode = 0644,
1446 .proc_handler = proc_dointvec_minmax,
1447 .extra1 = &zero,
1448 },
1449#else
1450 {
1451 .procname = "nr_trim_pages",
1452 .data = &sysctl_nr_trim_pages,
1453 .maxlen = sizeof(sysctl_nr_trim_pages),
1454 .mode = 0644,
1455 .proc_handler = proc_dointvec_minmax,
1456 .extra1 = &zero,
1457 },
1458#endif
1459 {
1460 .procname = "laptop_mode",
1461 .data = &laptop_mode,
1462 .maxlen = sizeof(laptop_mode),
1463 .mode = 0644,
1464 .proc_handler = proc_dointvec_jiffies,
1465 },
1466 {
1467 .procname = "block_dump",
1468 .data = &block_dump,
1469 .maxlen = sizeof(block_dump),
1470 .mode = 0644,
1471 .proc_handler = proc_dointvec,
1472 .extra1 = &zero,
1473 },
1474 {
1475 .procname = "vfs_cache_pressure",
1476 .data = &sysctl_vfs_cache_pressure,
1477 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1478 .mode = 0644,
1479 .proc_handler = proc_dointvec,
1480 .extra1 = &zero,
1481 },
1482#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1483 {
1484 .procname = "legacy_va_layout",
1485 .data = &sysctl_legacy_va_layout,
1486 .maxlen = sizeof(sysctl_legacy_va_layout),
1487 .mode = 0644,
1488 .proc_handler = proc_dointvec,
1489 .extra1 = &zero,
1490 },
1491#endif
1492#ifdef CONFIG_NUMA
1493 {
1494 .procname = "zone_reclaim_mode",
1495 .data = &node_reclaim_mode,
1496 .maxlen = sizeof(node_reclaim_mode),
1497 .mode = 0644,
1498 .proc_handler = proc_dointvec,
1499 .extra1 = &zero,
1500 },
1501 {
1502 .procname = "min_unmapped_ratio",
1503 .data = &sysctl_min_unmapped_ratio,
1504 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1505 .mode = 0644,
1506 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1507 .extra1 = &zero,
1508 .extra2 = &one_hundred,
1509 },
1510 {
1511 .procname = "min_slab_ratio",
1512 .data = &sysctl_min_slab_ratio,
1513 .maxlen = sizeof(sysctl_min_slab_ratio),
1514 .mode = 0644,
1515 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1516 .extra1 = &zero,
1517 .extra2 = &one_hundred,
1518 },
1519#endif
1520#ifdef CONFIG_SMP
1521 {
1522 .procname = "stat_interval",
1523 .data = &sysctl_stat_interval,
1524 .maxlen = sizeof(sysctl_stat_interval),
1525 .mode = 0644,
1526 .proc_handler = proc_dointvec_jiffies,
1527 },
1528 {
1529 .procname = "stat_refresh",
1530 .data = NULL,
1531 .maxlen = 0,
1532 .mode = 0600,
1533 .proc_handler = vmstat_refresh,
1534 },
1535#endif
1536#ifdef CONFIG_MMU
1537 {
1538 .procname = "mmap_min_addr",
1539 .data = &dac_mmap_min_addr,
1540 .maxlen = sizeof(unsigned long),
1541 .mode = 0644,
1542 .proc_handler = mmap_min_addr_handler,
1543 },
1544#endif
1545#ifdef CONFIG_NUMA
1546 {
1547 .procname = "numa_zonelist_order",
1548 .data = &numa_zonelist_order,
1549 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1550 .mode = 0644,
1551 .proc_handler = numa_zonelist_order_handler,
1552 },
1553#endif
1554#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1555 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1556 {
1557 .procname = "vdso_enabled",
1558#ifdef CONFIG_X86_32
1559 .data = &vdso32_enabled,
1560 .maxlen = sizeof(vdso32_enabled),
1561#else
1562 .data = &vdso_enabled,
1563 .maxlen = sizeof(vdso_enabled),
1564#endif
1565 .mode = 0644,
1566 .proc_handler = proc_dointvec,
1567 .extra1 = &zero,
1568 },
1569#endif
1570#ifdef CONFIG_HIGHMEM
1571 {
1572 .procname = "highmem_is_dirtyable",
1573 .data = &vm_highmem_is_dirtyable,
1574 .maxlen = sizeof(vm_highmem_is_dirtyable),
1575 .mode = 0644,
1576 .proc_handler = proc_dointvec_minmax,
1577 .extra1 = &zero,
1578 .extra2 = &one,
1579 },
1580#endif
1581#ifdef CONFIG_MEMORY_FAILURE
1582 {
1583 .procname = "memory_failure_early_kill",
1584 .data = &sysctl_memory_failure_early_kill,
1585 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1586 .mode = 0644,
1587 .proc_handler = proc_dointvec_minmax,
1588 .extra1 = &zero,
1589 .extra2 = &one,
1590 },
1591 {
1592 .procname = "memory_failure_recovery",
1593 .data = &sysctl_memory_failure_recovery,
1594 .maxlen = sizeof(sysctl_memory_failure_recovery),
1595 .mode = 0644,
1596 .proc_handler = proc_dointvec_minmax,
1597 .extra1 = &zero,
1598 .extra2 = &one,
1599 },
1600#endif
1601 {
1602 .procname = "user_reserve_kbytes",
1603 .data = &sysctl_user_reserve_kbytes,
1604 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1605 .mode = 0644,
1606 .proc_handler = proc_doulongvec_minmax,
1607 },
1608 {
1609 .procname = "admin_reserve_kbytes",
1610 .data = &sysctl_admin_reserve_kbytes,
1611 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1612 .mode = 0644,
1613 .proc_handler = proc_doulongvec_minmax,
1614 },
1615#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1616 {
1617 .procname = "mmap_rnd_bits",
1618 .data = &mmap_rnd_bits,
1619 .maxlen = sizeof(mmap_rnd_bits),
1620 .mode = 0600,
1621 .proc_handler = proc_dointvec_minmax,
1622 .extra1 = (void *)&mmap_rnd_bits_min,
1623 .extra2 = (void *)&mmap_rnd_bits_max,
1624 },
1625#endif
1626#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1627 {
1628 .procname = "mmap_rnd_compat_bits",
1629 .data = &mmap_rnd_compat_bits,
1630 .maxlen = sizeof(mmap_rnd_compat_bits),
1631 .mode = 0600,
1632 .proc_handler = proc_dointvec_minmax,
1633 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1634 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1635 },
1636#endif
1637 { }
1638};
1639
1640static struct ctl_table fs_table[] = {
1641 {
1642 .procname = "inode-nr",
1643 .data = &inodes_stat,
1644 .maxlen = 2*sizeof(long),
1645 .mode = 0444,
1646 .proc_handler = proc_nr_inodes,
1647 },
1648 {
1649 .procname = "inode-state",
1650 .data = &inodes_stat,
1651 .maxlen = 7*sizeof(long),
1652 .mode = 0444,
1653 .proc_handler = proc_nr_inodes,
1654 },
1655 {
1656 .procname = "file-nr",
1657 .data = &files_stat,
1658 .maxlen = sizeof(files_stat),
1659 .mode = 0444,
1660 .proc_handler = proc_nr_files,
1661 },
1662 {
1663 .procname = "file-max",
1664 .data = &files_stat.max_files,
1665 .maxlen = sizeof(files_stat.max_files),
1666 .mode = 0644,
1667 .proc_handler = proc_doulongvec_minmax,
1668 },
1669 {
1670 .procname = "nr_open",
1671 .data = &sysctl_nr_open,
1672 .maxlen = sizeof(unsigned int),
1673 .mode = 0644,
1674 .proc_handler = proc_dointvec_minmax,
1675 .extra1 = &sysctl_nr_open_min,
1676 .extra2 = &sysctl_nr_open_max,
1677 },
1678 {
1679 .procname = "dentry-state",
1680 .data = &dentry_stat,
1681 .maxlen = 6*sizeof(long),
1682 .mode = 0444,
1683 .proc_handler = proc_nr_dentry,
1684 },
1685 {
1686 .procname = "overflowuid",
1687 .data = &fs_overflowuid,
1688 .maxlen = sizeof(int),
1689 .mode = 0644,
1690 .proc_handler = proc_dointvec_minmax,
1691 .extra1 = &minolduid,
1692 .extra2 = &maxolduid,
1693 },
1694 {
1695 .procname = "overflowgid",
1696 .data = &fs_overflowgid,
1697 .maxlen = sizeof(int),
1698 .mode = 0644,
1699 .proc_handler = proc_dointvec_minmax,
1700 .extra1 = &minolduid,
1701 .extra2 = &maxolduid,
1702 },
1703#ifdef CONFIG_FILE_LOCKING
1704 {
1705 .procname = "leases-enable",
1706 .data = &leases_enable,
1707 .maxlen = sizeof(int),
1708 .mode = 0644,
1709 .proc_handler = proc_dointvec,
1710 },
1711#endif
1712#ifdef CONFIG_DNOTIFY
1713 {
1714 .procname = "dir-notify-enable",
1715 .data = &dir_notify_enable,
1716 .maxlen = sizeof(int),
1717 .mode = 0644,
1718 .proc_handler = proc_dointvec,
1719 },
1720#endif
1721#ifdef CONFIG_MMU
1722#ifdef CONFIG_FILE_LOCKING
1723 {
1724 .procname = "lease-break-time",
1725 .data = &lease_break_time,
1726 .maxlen = sizeof(int),
1727 .mode = 0644,
1728 .proc_handler = proc_dointvec,
1729 },
1730#endif
1731#ifdef CONFIG_AIO
1732 {
1733 .procname = "aio-nr",
1734 .data = &aio_nr,
1735 .maxlen = sizeof(aio_nr),
1736 .mode = 0444,
1737 .proc_handler = proc_doulongvec_minmax,
1738 },
1739 {
1740 .procname = "aio-max-nr",
1741 .data = &aio_max_nr,
1742 .maxlen = sizeof(aio_max_nr),
1743 .mode = 0644,
1744 .proc_handler = proc_doulongvec_minmax,
1745 },
1746#endif /* CONFIG_AIO */
1747#ifdef CONFIG_INOTIFY_USER
1748 {
1749 .procname = "inotify",
1750 .mode = 0555,
1751 .child = inotify_table,
1752 },
1753#endif
1754#ifdef CONFIG_EPOLL
1755 {
1756 .procname = "epoll",
1757 .mode = 0555,
1758 .child = epoll_table,
1759 },
1760#endif
1761#endif
1762 {
1763 .procname = "protected_symlinks",
1764 .data = &sysctl_protected_symlinks,
1765 .maxlen = sizeof(int),
1766 .mode = 0600,
1767 .proc_handler = proc_dointvec_minmax,
1768 .extra1 = &zero,
1769 .extra2 = &one,
1770 },
1771 {
1772 .procname = "protected_hardlinks",
1773 .data = &sysctl_protected_hardlinks,
1774 .maxlen = sizeof(int),
1775 .mode = 0600,
1776 .proc_handler = proc_dointvec_minmax,
1777 .extra1 = &zero,
1778 .extra2 = &one,
1779 },
1780 {
1781 .procname = "suid_dumpable",
1782 .data = &suid_dumpable,
1783 .maxlen = sizeof(int),
1784 .mode = 0644,
1785 .proc_handler = proc_dointvec_minmax_coredump,
1786 .extra1 = &zero,
1787 .extra2 = &two,
1788 },
1789#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1790 {
1791 .procname = "binfmt_misc",
1792 .mode = 0555,
1793 .child = sysctl_mount_point,
1794 },
1795#endif
1796 {
1797 .procname = "pipe-max-size",
1798 .data = &pipe_max_size,
1799 .maxlen = sizeof(int),
1800 .mode = 0644,
1801 .proc_handler = &pipe_proc_fn,
1802 .extra1 = &pipe_min_size,
1803 },
1804 {
1805 .procname = "pipe-user-pages-hard",
1806 .data = &pipe_user_pages_hard,
1807 .maxlen = sizeof(pipe_user_pages_hard),
1808 .mode = 0644,
1809 .proc_handler = proc_doulongvec_minmax,
1810 },
1811 {
1812 .procname = "pipe-user-pages-soft",
1813 .data = &pipe_user_pages_soft,
1814 .maxlen = sizeof(pipe_user_pages_soft),
1815 .mode = 0644,
1816 .proc_handler = proc_doulongvec_minmax,
1817 },
1818 {
1819 .procname = "mount-max",
1820 .data = &sysctl_mount_max,
1821 .maxlen = sizeof(unsigned int),
1822 .mode = 0644,
1823 .proc_handler = proc_dointvec_minmax,
1824 .extra1 = &one,
1825 },
1826 { }
1827};
1828
1829static struct ctl_table debug_table[] = {
1830#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1831 {
1832 .procname = "exception-trace",
1833 .data = &show_unhandled_signals,
1834 .maxlen = sizeof(int),
1835 .mode = 0644,
1836 .proc_handler = proc_dointvec
1837 },
1838#endif
1839#if defined(CONFIG_OPTPROBES)
1840 {
1841 .procname = "kprobes-optimization",
1842 .data = &sysctl_kprobes_optimization,
1843 .maxlen = sizeof(int),
1844 .mode = 0644,
1845 .proc_handler = proc_kprobes_optimization_handler,
1846 .extra1 = &zero,
1847 .extra2 = &one,
1848 },
1849#endif
1850 { }
1851};
1852
1853static struct ctl_table dev_table[] = {
1854 { }
1855};
1856
1857int __init sysctl_init(void)
1858{
1859 struct ctl_table_header *hdr;
1860
1861 hdr = register_sysctl_table(sysctl_base_table);
1862 kmemleak_not_leak(hdr);
1863 return 0;
1864}
1865
1866#endif /* CONFIG_SYSCTL */
1867
1868/*
1869 * /proc/sys support
1870 */
1871
1872#ifdef CONFIG_PROC_SYSCTL
1873
1874static int _proc_do_string(char *data, int maxlen, int write,
1875 char __user *buffer,
1876 size_t *lenp, loff_t *ppos)
1877{
1878 size_t len;
1879 char __user *p;
1880 char c;
1881
1882 if (!data || !maxlen || !*lenp) {
1883 *lenp = 0;
1884 return 0;
1885 }
1886
1887 if (write) {
1888 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1889 /* Only continue writes not past the end of buffer. */
1890 len = strlen(data);
1891 if (len > maxlen - 1)
1892 len = maxlen - 1;
1893
1894 if (*ppos > len)
1895 return 0;
1896 len = *ppos;
1897 } else {
1898 /* Start writing from beginning of buffer. */
1899 len = 0;
1900 }
1901
1902 *ppos += *lenp;
1903 p = buffer;
1904 while ((p - buffer) < *lenp && len < maxlen - 1) {
1905 if (get_user(c, p++))
1906 return -EFAULT;
1907 if (c == 0 || c == '\n')
1908 break;
1909 data[len++] = c;
1910 }
1911 data[len] = 0;
1912 } else {
1913 len = strlen(data);
1914 if (len > maxlen)
1915 len = maxlen;
1916
1917 if (*ppos > len) {
1918 *lenp = 0;
1919 return 0;
1920 }
1921
1922 data += *ppos;
1923 len -= *ppos;
1924
1925 if (len > *lenp)
1926 len = *lenp;
1927 if (len)
1928 if (copy_to_user(buffer, data, len))
1929 return -EFAULT;
1930 if (len < *lenp) {
1931 if (put_user('\n', buffer + len))
1932 return -EFAULT;
1933 len++;
1934 }
1935 *lenp = len;
1936 *ppos += len;
1937 }
1938 return 0;
1939}
1940
1941static void warn_sysctl_write(struct ctl_table *table)
1942{
1943 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1944 "This will not be supported in the future. To silence this\n"
1945 "warning, set kernel.sysctl_writes_strict = -1\n",
1946 current->comm, table->procname);
1947}
1948
1949/**
1950 * proc_dostring - read a string sysctl
1951 * @table: the sysctl table
1952 * @write: %TRUE if this is a write to the sysctl file
1953 * @buffer: the user buffer
1954 * @lenp: the size of the user buffer
1955 * @ppos: file position
1956 *
1957 * Reads/writes a string from/to the user buffer. If the kernel
1958 * buffer provided is not large enough to hold the string, the
1959 * string is truncated. The copied string is %NULL-terminated.
1960 * If the string is being read by the user process, it is copied
1961 * and a newline '\n' is added. It is truncated if the buffer is
1962 * not large enough.
1963 *
1964 * Returns 0 on success.
1965 */
1966int proc_dostring(struct ctl_table *table, int write,
1967 void __user *buffer, size_t *lenp, loff_t *ppos)
1968{
1969 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1970 warn_sysctl_write(table);
1971
1972 return _proc_do_string((char *)(table->data), table->maxlen, write,
1973 (char __user *)buffer, lenp, ppos);
1974}
1975
1976static size_t proc_skip_spaces(char **buf)
1977{
1978 size_t ret;
1979 char *tmp = skip_spaces(*buf);
1980 ret = tmp - *buf;
1981 *buf = tmp;
1982 return ret;
1983}
1984
1985static void proc_skip_char(char **buf, size_t *size, const char v)
1986{
1987 while (*size) {
1988 if (**buf != v)
1989 break;
1990 (*size)--;
1991 (*buf)++;
1992 }
1993}
1994
1995#define TMPBUFLEN 22
1996/**
1997 * proc_get_long - reads an ASCII formatted integer from a user buffer
1998 *
1999 * @buf: a kernel buffer
2000 * @size: size of the kernel buffer
2001 * @val: this is where the number will be stored
2002 * @neg: set to %TRUE if number is negative
2003 * @perm_tr: a vector which contains the allowed trailers
2004 * @perm_tr_len: size of the perm_tr vector
2005 * @tr: pointer to store the trailer character
2006 *
2007 * In case of success %0 is returned and @buf and @size are updated with
2008 * the amount of bytes read. If @tr is non-NULL and a trailing
2009 * character exists (size is non-zero after returning from this
2010 * function), @tr is updated with the trailing character.
2011 */
2012static int proc_get_long(char **buf, size_t *size,
2013 unsigned long *val, bool *neg,
2014 const char *perm_tr, unsigned perm_tr_len, char *tr)
2015{
2016 int len;
2017 char *p, tmp[TMPBUFLEN];
2018
2019 if (!*size)
2020 return -EINVAL;
2021
2022 len = *size;
2023 if (len > TMPBUFLEN - 1)
2024 len = TMPBUFLEN - 1;
2025
2026 memcpy(tmp, *buf, len);
2027
2028 tmp[len] = 0;
2029 p = tmp;
2030 if (*p == '-' && *size > 1) {
2031 *neg = true;
2032 p++;
2033 } else
2034 *neg = false;
2035 if (!isdigit(*p))
2036 return -EINVAL;
2037
2038 *val = simple_strtoul(p, &p, 0);
2039
2040 len = p - tmp;
2041
2042 /* We don't know if the next char is whitespace thus we may accept
2043 * invalid integers (e.g. 1234...a) or two integers instead of one
2044 * (e.g. 123...1). So lets not allow such large numbers. */
2045 if (len == TMPBUFLEN - 1)
2046 return -EINVAL;
2047
2048 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2049 return -EINVAL;
2050
2051 if (tr && (len < *size))
2052 *tr = *p;
2053
2054 *buf += len;
2055 *size -= len;
2056
2057 return 0;
2058}
2059
2060/**
2061 * proc_put_long - converts an integer to a decimal ASCII formatted string
2062 *
2063 * @buf: the user buffer
2064 * @size: the size of the user buffer
2065 * @val: the integer to be converted
2066 * @neg: sign of the number, %TRUE for negative
2067 *
2068 * In case of success %0 is returned and @buf and @size are updated with
2069 * the amount of bytes written.
2070 */
2071static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2072 bool neg)
2073{
2074 int len;
2075 char tmp[TMPBUFLEN], *p = tmp;
2076
2077 sprintf(p, "%s%lu", neg ? "-" : "", val);
2078 len = strlen(tmp);
2079 if (len > *size)
2080 len = *size;
2081 if (copy_to_user(*buf, tmp, len))
2082 return -EFAULT;
2083 *size -= len;
2084 *buf += len;
2085 return 0;
2086}
2087#undef TMPBUFLEN
2088
2089static int proc_put_char(void __user **buf, size_t *size, char c)
2090{
2091 if (*size) {
2092 char __user **buffer = (char __user **)buf;
2093 if (put_user(c, *buffer))
2094 return -EFAULT;
2095 (*size)--, (*buffer)++;
2096 *buf = *buffer;
2097 }
2098 return 0;
2099}
2100
2101static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2102 int *valp,
2103 int write, void *data)
2104{
2105 if (write) {
2106 if (*negp) {
2107 if (*lvalp > (unsigned long) INT_MAX + 1)
2108 return -EINVAL;
2109 *valp = -*lvalp;
2110 } else {
2111 if (*lvalp > (unsigned long) INT_MAX)
2112 return -EINVAL;
2113 *valp = *lvalp;
2114 }
2115 } else {
2116 int val = *valp;
2117 if (val < 0) {
2118 *negp = true;
2119 *lvalp = -(unsigned long)val;
2120 } else {
2121 *negp = false;
2122 *lvalp = (unsigned long)val;
2123 }
2124 }
2125 return 0;
2126}
2127
2128static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2129 int *valp,
2130 int write, void *data)
2131{
2132 if (write) {
2133 if (*negp)
2134 return -EINVAL;
2135 *valp = *lvalp;
2136 } else {
2137 unsigned int val = *valp;
2138 *lvalp = (unsigned long)val;
2139 }
2140 return 0;
2141}
2142
2143static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2144
2145static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2146 int write, void __user *buffer,
2147 size_t *lenp, loff_t *ppos,
2148 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2149 int write, void *data),
2150 void *data)
2151{
2152 int *i, vleft, first = 1, err = 0;
2153 size_t left;
2154 char *kbuf = NULL, *p;
2155
2156 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2157 *lenp = 0;
2158 return 0;
2159 }
2160
2161 i = (int *) tbl_data;
2162 vleft = table->maxlen / sizeof(*i);
2163 left = *lenp;
2164
2165 if (!conv)
2166 conv = do_proc_dointvec_conv;
2167
2168 if (write) {
2169 if (*ppos) {
2170 switch (sysctl_writes_strict) {
2171 case SYSCTL_WRITES_STRICT:
2172 goto out;
2173 case SYSCTL_WRITES_WARN:
2174 warn_sysctl_write(table);
2175 break;
2176 default:
2177 break;
2178 }
2179 }
2180
2181 if (left > PAGE_SIZE - 1)
2182 left = PAGE_SIZE - 1;
2183 p = kbuf = memdup_user_nul(buffer, left);
2184 if (IS_ERR(kbuf))
2185 return PTR_ERR(kbuf);
2186 }
2187
2188 for (; left && vleft--; i++, first=0) {
2189 unsigned long lval;
2190 bool neg;
2191
2192 if (write) {
2193 left -= proc_skip_spaces(&p);
2194
2195 if (!left)
2196 break;
2197 err = proc_get_long(&p, &left, &lval, &neg,
2198 proc_wspace_sep,
2199 sizeof(proc_wspace_sep), NULL);
2200 if (err)
2201 break;
2202 if (conv(&neg, &lval, i, 1, data)) {
2203 err = -EINVAL;
2204 break;
2205 }
2206 } else {
2207 if (conv(&neg, &lval, i, 0, data)) {
2208 err = -EINVAL;
2209 break;
2210 }
2211 if (!first)
2212 err = proc_put_char(&buffer, &left, '\t');
2213 if (err)
2214 break;
2215 err = proc_put_long(&buffer, &left, lval, neg);
2216 if (err)
2217 break;
2218 }
2219 }
2220
2221 if (!write && !first && left && !err)
2222 err = proc_put_char(&buffer, &left, '\n');
2223 if (write && !err && left)
2224 left -= proc_skip_spaces(&p);
2225 if (write) {
2226 kfree(kbuf);
2227 if (first)
2228 return err ? : -EINVAL;
2229 }
2230 *lenp -= left;
2231out:
2232 *ppos += *lenp;
2233 return err;
2234}
2235
2236static int do_proc_dointvec(struct ctl_table *table, int write,
2237 void __user *buffer, size_t *lenp, loff_t *ppos,
2238 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2239 int write, void *data),
2240 void *data)
2241{
2242 return __do_proc_dointvec(table->data, table, write,
2243 buffer, lenp, ppos, conv, data);
2244}
2245
2246/**
2247 * proc_dointvec - read a vector of integers
2248 * @table: the sysctl table
2249 * @write: %TRUE if this is a write to the sysctl file
2250 * @buffer: the user buffer
2251 * @lenp: the size of the user buffer
2252 * @ppos: file position
2253 *
2254 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2255 * values from/to the user buffer, treated as an ASCII string.
2256 *
2257 * Returns 0 on success.
2258 */
2259int proc_dointvec(struct ctl_table *table, int write,
2260 void __user *buffer, size_t *lenp, loff_t *ppos)
2261{
2262 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2263}
2264
2265/**
2266 * proc_douintvec - read a vector of unsigned integers
2267 * @table: the sysctl table
2268 * @write: %TRUE if this is a write to the sysctl file
2269 * @buffer: the user buffer
2270 * @lenp: the size of the user buffer
2271 * @ppos: file position
2272 *
2273 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2274 * values from/to the user buffer, treated as an ASCII string.
2275 *
2276 * Returns 0 on success.
2277 */
2278int proc_douintvec(struct ctl_table *table, int write,
2279 void __user *buffer, size_t *lenp, loff_t *ppos)
2280{
2281 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2282 do_proc_douintvec_conv, NULL);
2283}
2284
2285/*
2286 * Taint values can only be increased
2287 * This means we can safely use a temporary.
2288 */
2289static int proc_taint(struct ctl_table *table, int write,
2290 void __user *buffer, size_t *lenp, loff_t *ppos)
2291{
2292 struct ctl_table t;
2293 unsigned long tmptaint = get_taint();
2294 int err;
2295
2296 if (write && !capable(CAP_SYS_ADMIN))
2297 return -EPERM;
2298
2299 t = *table;
2300 t.data = &tmptaint;
2301 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2302 if (err < 0)
2303 return err;
2304
2305 if (write) {
2306 /*
2307 * Poor man's atomic or. Not worth adding a primitive
2308 * to everyone's atomic.h for this
2309 */
2310 int i;
2311 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2312 if ((tmptaint >> i) & 1)
2313 add_taint(i, LOCKDEP_STILL_OK);
2314 }
2315 }
2316
2317 return err;
2318}
2319
2320#ifdef CONFIG_PRINTK
2321static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2322 void __user *buffer, size_t *lenp, loff_t *ppos)
2323{
2324 if (write && !capable(CAP_SYS_ADMIN))
2325 return -EPERM;
2326
2327 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2328}
2329#endif
2330
2331struct do_proc_dointvec_minmax_conv_param {
2332 int *min;
2333 int *max;
2334};
2335
2336static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2337 int *valp,
2338 int write, void *data)
2339{
2340 struct do_proc_dointvec_minmax_conv_param *param = data;
2341 if (write) {
2342 int val = *negp ? -*lvalp : *lvalp;
2343 if ((param->min && *param->min > val) ||
2344 (param->max && *param->max < val))
2345 return -EINVAL;
2346 *valp = val;
2347 } else {
2348 int val = *valp;
2349 if (val < 0) {
2350 *negp = true;
2351 *lvalp = -(unsigned long)val;
2352 } else {
2353 *negp = false;
2354 *lvalp = (unsigned long)val;
2355 }
2356 }
2357 return 0;
2358}
2359
2360/**
2361 * proc_dointvec_minmax - read a vector of integers with min/max values
2362 * @table: the sysctl table
2363 * @write: %TRUE if this is a write to the sysctl file
2364 * @buffer: the user buffer
2365 * @lenp: the size of the user buffer
2366 * @ppos: file position
2367 *
2368 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2369 * values from/to the user buffer, treated as an ASCII string.
2370 *
2371 * This routine will ensure the values are within the range specified by
2372 * table->extra1 (min) and table->extra2 (max).
2373 *
2374 * Returns 0 on success.
2375 */
2376int proc_dointvec_minmax(struct ctl_table *table, int write,
2377 void __user *buffer, size_t *lenp, loff_t *ppos)
2378{
2379 struct do_proc_dointvec_minmax_conv_param param = {
2380 .min = (int *) table->extra1,
2381 .max = (int *) table->extra2,
2382 };
2383 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2384 do_proc_dointvec_minmax_conv, ¶m);
2385}
2386
2387static void validate_coredump_safety(void)
2388{
2389#ifdef CONFIG_COREDUMP
2390 if (suid_dumpable == SUID_DUMP_ROOT &&
2391 core_pattern[0] != '/' && core_pattern[0] != '|') {
2392 printk(KERN_WARNING
2393"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2394"Pipe handler or fully qualified core dump path required.\n"
2395"Set kernel.core_pattern before fs.suid_dumpable.\n"
2396 );
2397 }
2398#endif
2399}
2400
2401static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2402 void __user *buffer, size_t *lenp, loff_t *ppos)
2403{
2404 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2405 if (!error)
2406 validate_coredump_safety();
2407 return error;
2408}
2409
2410#ifdef CONFIG_COREDUMP
2411static int proc_dostring_coredump(struct ctl_table *table, int write,
2412 void __user *buffer, size_t *lenp, loff_t *ppos)
2413{
2414 int error = proc_dostring(table, write, buffer, lenp, ppos);
2415 if (!error)
2416 validate_coredump_safety();
2417 return error;
2418}
2419#endif
2420
2421static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2422 void __user *buffer,
2423 size_t *lenp, loff_t *ppos,
2424 unsigned long convmul,
2425 unsigned long convdiv)
2426{
2427 unsigned long *i, *min, *max;
2428 int vleft, first = 1, err = 0;
2429 size_t left;
2430 char *kbuf = NULL, *p;
2431
2432 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2433 *lenp = 0;
2434 return 0;
2435 }
2436
2437 i = (unsigned long *) data;
2438 min = (unsigned long *) table->extra1;
2439 max = (unsigned long *) table->extra2;
2440 vleft = table->maxlen / sizeof(unsigned long);
2441 left = *lenp;
2442
2443 if (write) {
2444 if (*ppos) {
2445 switch (sysctl_writes_strict) {
2446 case SYSCTL_WRITES_STRICT:
2447 goto out;
2448 case SYSCTL_WRITES_WARN:
2449 warn_sysctl_write(table);
2450 break;
2451 default:
2452 break;
2453 }
2454 }
2455
2456 if (left > PAGE_SIZE - 1)
2457 left = PAGE_SIZE - 1;
2458 p = kbuf = memdup_user_nul(buffer, left);
2459 if (IS_ERR(kbuf))
2460 return PTR_ERR(kbuf);
2461 }
2462
2463 for (; left && vleft--; i++, first = 0) {
2464 unsigned long val;
2465
2466 if (write) {
2467 bool neg;
2468
2469 left -= proc_skip_spaces(&p);
2470
2471 err = proc_get_long(&p, &left, &val, &neg,
2472 proc_wspace_sep,
2473 sizeof(proc_wspace_sep), NULL);
2474 if (err)
2475 break;
2476 if (neg)
2477 continue;
2478 val = convmul * val / convdiv;
2479 if ((min && val < *min) || (max && val > *max))
2480 continue;
2481 *i = val;
2482 } else {
2483 val = convdiv * (*i) / convmul;
2484 if (!first) {
2485 err = proc_put_char(&buffer, &left, '\t');
2486 if (err)
2487 break;
2488 }
2489 err = proc_put_long(&buffer, &left, val, false);
2490 if (err)
2491 break;
2492 }
2493 }
2494
2495 if (!write && !first && left && !err)
2496 err = proc_put_char(&buffer, &left, '\n');
2497 if (write && !err)
2498 left -= proc_skip_spaces(&p);
2499 if (write) {
2500 kfree(kbuf);
2501 if (first)
2502 return err ? : -EINVAL;
2503 }
2504 *lenp -= left;
2505out:
2506 *ppos += *lenp;
2507 return err;
2508}
2509
2510static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2511 void __user *buffer,
2512 size_t *lenp, loff_t *ppos,
2513 unsigned long convmul,
2514 unsigned long convdiv)
2515{
2516 return __do_proc_doulongvec_minmax(table->data, table, write,
2517 buffer, lenp, ppos, convmul, convdiv);
2518}
2519
2520/**
2521 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2522 * @table: the sysctl table
2523 * @write: %TRUE if this is a write to the sysctl file
2524 * @buffer: the user buffer
2525 * @lenp: the size of the user buffer
2526 * @ppos: file position
2527 *
2528 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2529 * values from/to the user buffer, treated as an ASCII string.
2530 *
2531 * This routine will ensure the values are within the range specified by
2532 * table->extra1 (min) and table->extra2 (max).
2533 *
2534 * Returns 0 on success.
2535 */
2536int proc_doulongvec_minmax(struct ctl_table *table, int write,
2537 void __user *buffer, size_t *lenp, loff_t *ppos)
2538{
2539 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2540}
2541
2542/**
2543 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2544 * @table: the sysctl table
2545 * @write: %TRUE if this is a write to the sysctl file
2546 * @buffer: the user buffer
2547 * @lenp: the size of the user buffer
2548 * @ppos: file position
2549 *
2550 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2551 * values from/to the user buffer, treated as an ASCII string. The values
2552 * are treated as milliseconds, and converted to jiffies when they are stored.
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_ms_jiffies_minmax(struct ctl_table *table, int write,
2560 void __user *buffer,
2561 size_t *lenp, loff_t *ppos)
2562{
2563 return do_proc_doulongvec_minmax(table, write, buffer,
2564 lenp, ppos, HZ, 1000l);
2565}
2566
2567
2568static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2569 int *valp,
2570 int write, void *data)
2571{
2572 if (write) {
2573 if (*lvalp > LONG_MAX / HZ)
2574 return 1;
2575 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2576 } else {
2577 int val = *valp;
2578 unsigned long lval;
2579 if (val < 0) {
2580 *negp = true;
2581 lval = -(unsigned long)val;
2582 } else {
2583 *negp = false;
2584 lval = (unsigned long)val;
2585 }
2586 *lvalp = lval / HZ;
2587 }
2588 return 0;
2589}
2590
2591static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2592 int *valp,
2593 int write, void *data)
2594{
2595 if (write) {
2596 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2597 return 1;
2598 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
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 = jiffies_to_clock_t(lval);
2610 }
2611 return 0;
2612}
2613
2614static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2615 int *valp,
2616 int write, void *data)
2617{
2618 if (write) {
2619 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2620
2621 if (jif > INT_MAX)
2622 return 1;
2623 *valp = (int)jif;
2624 } else {
2625 int val = *valp;
2626 unsigned long lval;
2627 if (val < 0) {
2628 *negp = true;
2629 lval = -(unsigned long)val;
2630 } else {
2631 *negp = false;
2632 lval = (unsigned long)val;
2633 }
2634 *lvalp = jiffies_to_msecs(lval);
2635 }
2636 return 0;
2637}
2638
2639/**
2640 * proc_dointvec_jiffies - read a vector of integers as seconds
2641 * @table: the sysctl table
2642 * @write: %TRUE if this is a write to the sysctl file
2643 * @buffer: the user buffer
2644 * @lenp: the size of the user buffer
2645 * @ppos: file position
2646 *
2647 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2648 * values from/to the user buffer, treated as an ASCII string.
2649 * The values read are assumed to be in seconds, and are converted into
2650 * jiffies.
2651 *
2652 * Returns 0 on success.
2653 */
2654int proc_dointvec_jiffies(struct ctl_table *table, int write,
2655 void __user *buffer, size_t *lenp, loff_t *ppos)
2656{
2657 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2658 do_proc_dointvec_jiffies_conv,NULL);
2659}
2660
2661/**
2662 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2663 * @table: the sysctl table
2664 * @write: %TRUE if this is a write to the sysctl file
2665 * @buffer: the user buffer
2666 * @lenp: the size of the user buffer
2667 * @ppos: pointer to the file position
2668 *
2669 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2670 * values from/to the user buffer, treated as an ASCII string.
2671 * The values read are assumed to be in 1/USER_HZ seconds, and
2672 * are converted into jiffies.
2673 *
2674 * Returns 0 on success.
2675 */
2676int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2677 void __user *buffer, size_t *lenp, loff_t *ppos)
2678{
2679 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2680 do_proc_dointvec_userhz_jiffies_conv,NULL);
2681}
2682
2683/**
2684 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2685 * @table: the sysctl table
2686 * @write: %TRUE if this is a write to the sysctl file
2687 * @buffer: the user buffer
2688 * @lenp: the size of the user buffer
2689 * @ppos: file position
2690 * @ppos: the current position in the file
2691 *
2692 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2693 * values from/to the user buffer, treated as an ASCII string.
2694 * The values read are assumed to be in 1/1000 seconds, and
2695 * are converted into jiffies.
2696 *
2697 * Returns 0 on success.
2698 */
2699int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701{
2702 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2703 do_proc_dointvec_ms_jiffies_conv, NULL);
2704}
2705
2706static int proc_do_cad_pid(struct ctl_table *table, int write,
2707 void __user *buffer, size_t *lenp, loff_t *ppos)
2708{
2709 struct pid *new_pid;
2710 pid_t tmp;
2711 int r;
2712
2713 tmp = pid_vnr(cad_pid);
2714
2715 r = __do_proc_dointvec(&tmp, table, write, buffer,
2716 lenp, ppos, NULL, NULL);
2717 if (r || !write)
2718 return r;
2719
2720 new_pid = find_get_pid(tmp);
2721 if (!new_pid)
2722 return -ESRCH;
2723
2724 put_pid(xchg(&cad_pid, new_pid));
2725 return 0;
2726}
2727
2728/**
2729 * proc_do_large_bitmap - read/write from/to a large bitmap
2730 * @table: the sysctl table
2731 * @write: %TRUE if this is a write to the sysctl file
2732 * @buffer: the user buffer
2733 * @lenp: the size of the user buffer
2734 * @ppos: file position
2735 *
2736 * The bitmap is stored at table->data and the bitmap length (in bits)
2737 * in table->maxlen.
2738 *
2739 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2740 * large bitmaps may be represented in a compact manner. Writing into
2741 * the file will clear the bitmap then update it with the given input.
2742 *
2743 * Returns 0 on success.
2744 */
2745int proc_do_large_bitmap(struct ctl_table *table, int write,
2746 void __user *buffer, size_t *lenp, loff_t *ppos)
2747{
2748 int err = 0;
2749 bool first = 1;
2750 size_t left = *lenp;
2751 unsigned long bitmap_len = table->maxlen;
2752 unsigned long *bitmap = *(unsigned long **) table->data;
2753 unsigned long *tmp_bitmap = NULL;
2754 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2755
2756 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2757 *lenp = 0;
2758 return 0;
2759 }
2760
2761 if (write) {
2762 char *kbuf, *p;
2763
2764 if (left > PAGE_SIZE - 1)
2765 left = PAGE_SIZE - 1;
2766
2767 p = kbuf = memdup_user_nul(buffer, left);
2768 if (IS_ERR(kbuf))
2769 return PTR_ERR(kbuf);
2770
2771 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2772 GFP_KERNEL);
2773 if (!tmp_bitmap) {
2774 kfree(kbuf);
2775 return -ENOMEM;
2776 }
2777 proc_skip_char(&p, &left, '\n');
2778 while (!err && left) {
2779 unsigned long val_a, val_b;
2780 bool neg;
2781
2782 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2783 sizeof(tr_a), &c);
2784 if (err)
2785 break;
2786 if (val_a >= bitmap_len || neg) {
2787 err = -EINVAL;
2788 break;
2789 }
2790
2791 val_b = val_a;
2792 if (left) {
2793 p++;
2794 left--;
2795 }
2796
2797 if (c == '-') {
2798 err = proc_get_long(&p, &left, &val_b,
2799 &neg, tr_b, sizeof(tr_b),
2800 &c);
2801 if (err)
2802 break;
2803 if (val_b >= bitmap_len || neg ||
2804 val_a > val_b) {
2805 err = -EINVAL;
2806 break;
2807 }
2808 if (left) {
2809 p++;
2810 left--;
2811 }
2812 }
2813
2814 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2815 first = 0;
2816 proc_skip_char(&p, &left, '\n');
2817 }
2818 kfree(kbuf);
2819 } else {
2820 unsigned long bit_a, bit_b = 0;
2821
2822 while (left) {
2823 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2824 if (bit_a >= bitmap_len)
2825 break;
2826 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2827 bit_a + 1) - 1;
2828
2829 if (!first) {
2830 err = proc_put_char(&buffer, &left, ',');
2831 if (err)
2832 break;
2833 }
2834 err = proc_put_long(&buffer, &left, bit_a, false);
2835 if (err)
2836 break;
2837 if (bit_a != bit_b) {
2838 err = proc_put_char(&buffer, &left, '-');
2839 if (err)
2840 break;
2841 err = proc_put_long(&buffer, &left, bit_b, false);
2842 if (err)
2843 break;
2844 }
2845
2846 first = 0; bit_b++;
2847 }
2848 if (!err)
2849 err = proc_put_char(&buffer, &left, '\n');
2850 }
2851
2852 if (!err) {
2853 if (write) {
2854 if (*ppos)
2855 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2856 else
2857 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2858 }
2859 kfree(tmp_bitmap);
2860 *lenp -= left;
2861 *ppos += *lenp;
2862 return 0;
2863 } else {
2864 kfree(tmp_bitmap);
2865 return err;
2866 }
2867}
2868
2869#else /* CONFIG_PROC_SYSCTL */
2870
2871int proc_dostring(struct ctl_table *table, int write,
2872 void __user *buffer, size_t *lenp, loff_t *ppos)
2873{
2874 return -ENOSYS;
2875}
2876
2877int proc_dointvec(struct ctl_table *table, int write,
2878 void __user *buffer, size_t *lenp, loff_t *ppos)
2879{
2880 return -ENOSYS;
2881}
2882
2883int proc_douintvec(struct ctl_table *table, int write,
2884 void __user *buffer, size_t *lenp, loff_t *ppos)
2885{
2886 return -ENOSYS;
2887}
2888
2889int proc_dointvec_minmax(struct ctl_table *table, int write,
2890 void __user *buffer, size_t *lenp, loff_t *ppos)
2891{
2892 return -ENOSYS;
2893}
2894
2895int proc_dointvec_jiffies(struct ctl_table *table, int write,
2896 void __user *buffer, size_t *lenp, loff_t *ppos)
2897{
2898 return -ENOSYS;
2899}
2900
2901int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2902 void __user *buffer, size_t *lenp, loff_t *ppos)
2903{
2904 return -ENOSYS;
2905}
2906
2907int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2908 void __user *buffer, size_t *lenp, loff_t *ppos)
2909{
2910 return -ENOSYS;
2911}
2912
2913int proc_doulongvec_minmax(struct ctl_table *table, int write,
2914 void __user *buffer, size_t *lenp, loff_t *ppos)
2915{
2916 return -ENOSYS;
2917}
2918
2919int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2920 void __user *buffer,
2921 size_t *lenp, loff_t *ppos)
2922{
2923 return -ENOSYS;
2924}
2925
2926
2927#endif /* CONFIG_PROC_SYSCTL */
2928
2929/*
2930 * No sense putting this after each symbol definition, twice,
2931 * exception granted :-)
2932 */
2933EXPORT_SYMBOL(proc_dointvec);
2934EXPORT_SYMBOL(proc_douintvec);
2935EXPORT_SYMBOL(proc_dointvec_jiffies);
2936EXPORT_SYMBOL(proc_dointvec_minmax);
2937EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2938EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2939EXPORT_SYMBOL(proc_dostring);
2940EXPORT_SYMBOL(proc_doulongvec_minmax);
2941EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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/bitmap.h>
27#include <linux/signal.h>
28#include <linux/printk.h>
29#include <linux/proc_fs.h>
30#include <linux/security.h>
31#include <linux/ctype.h>
32#include <linux/kmemcheck.h>
33#include <linux/fs.h>
34#include <linux/init.h>
35#include <linux/kernel.h>
36#include <linux/kobject.h>
37#include <linux/net.h>
38#include <linux/sysrq.h>
39#include <linux/highuid.h>
40#include <linux/writeback.h>
41#include <linux/ratelimit.h>
42#include <linux/compaction.h>
43#include <linux/hugetlb.h>
44#include <linux/initrd.h>
45#include <linux/key.h>
46#include <linux/times.h>
47#include <linux/limits.h>
48#include <linux/dcache.h>
49#include <linux/dnotify.h>
50#include <linux/syscalls.h>
51#include <linux/vmstat.h>
52#include <linux/nfs_fs.h>
53#include <linux/acpi.h>
54#include <linux/reboot.h>
55#include <linux/ftrace.h>
56#include <linux/perf_event.h>
57#include <linux/kprobes.h>
58#include <linux/pipe_fs_i.h>
59#include <linux/oom.h>
60#include <linux/kmod.h>
61#include <linux/capability.h>
62#include <linux/binfmts.h>
63
64#include <asm/uaccess.h>
65#include <asm/processor.h>
66
67#ifdef CONFIG_X86
68#include <asm/nmi.h>
69#include <asm/stacktrace.h>
70#include <asm/io.h>
71#endif
72#ifdef CONFIG_SPARC
73#include <asm/setup.h>
74#endif
75#ifdef CONFIG_BSD_PROCESS_ACCT
76#include <linux/acct.h>
77#endif
78#ifdef CONFIG_RT_MUTEXES
79#include <linux/rtmutex.h>
80#endif
81#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
82#include <linux/lockdep.h>
83#endif
84#ifdef CONFIG_CHR_DEV_SG
85#include <scsi/sg.h>
86#endif
87
88#ifdef CONFIG_LOCKUP_DETECTOR
89#include <linux/nmi.h>
90#endif
91
92
93#if defined(CONFIG_SYSCTL)
94
95/* External variables not in a header file. */
96extern int sysctl_overcommit_memory;
97extern int sysctl_overcommit_ratio;
98extern int max_threads;
99extern int core_uses_pid;
100extern int suid_dumpable;
101extern char core_pattern[];
102extern unsigned int core_pipe_limit;
103extern int pid_max;
104extern int min_free_kbytes;
105extern int pid_max_min, pid_max_max;
106extern int sysctl_drop_caches;
107extern int percpu_pagelist_fraction;
108extern int compat_log;
109extern int latencytop_enabled;
110extern int sysctl_nr_open_min, sysctl_nr_open_max;
111#ifndef CONFIG_MMU
112extern int sysctl_nr_trim_pages;
113#endif
114#ifdef CONFIG_BLOCK
115extern int blk_iopoll_enabled;
116#endif
117
118/* Constants used for minimum and maximum */
119#ifdef CONFIG_LOCKUP_DETECTOR
120static int sixty = 60;
121static int neg_one = -1;
122#endif
123
124static int zero;
125static int __maybe_unused one = 1;
126static int __maybe_unused two = 2;
127static int __maybe_unused three = 3;
128static unsigned long one_ul = 1;
129static int one_hundred = 100;
130#ifdef CONFIG_PRINTK
131static int ten_thousand = 10000;
132#endif
133
134/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136
137/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138static int maxolduid = 65535;
139static int minolduid;
140static int min_percpu_pagelist_fract = 8;
141
142static int ngroups_max = NGROUPS_MAX;
143static const int cap_last_cap = CAP_LAST_CAP;
144
145#ifdef CONFIG_INOTIFY_USER
146#include <linux/inotify.h>
147#endif
148#ifdef CONFIG_SPARC
149#endif
150
151#ifdef CONFIG_SPARC64
152extern int sysctl_tsb_ratio;
153#endif
154
155#ifdef __hppa__
156extern int pwrsw_enabled;
157extern int unaligned_enabled;
158#endif
159
160#ifdef CONFIG_IA64
161extern int no_unaligned_warning;
162extern int unaligned_dump_stack;
163#endif
164
165#ifdef CONFIG_PROC_SYSCTL
166static int proc_do_cad_pid(struct ctl_table *table, int write,
167 void __user *buffer, size_t *lenp, loff_t *ppos);
168static 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_PRINTK
173static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175#endif
176
177#ifdef CONFIG_MAGIC_SYSRQ
178/* Note: sysrq code uses it's own private copy */
179static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
180
181static int sysrq_sysctl_handler(ctl_table *table, int write,
182 void __user *buffer, size_t *lenp,
183 loff_t *ppos)
184{
185 int error;
186
187 error = proc_dointvec(table, write, buffer, lenp, ppos);
188 if (error)
189 return error;
190
191 if (write)
192 sysrq_toggle_support(__sysrq_enabled);
193
194 return 0;
195}
196
197#endif
198
199static struct ctl_table kern_table[];
200static struct ctl_table vm_table[];
201static struct ctl_table fs_table[];
202static struct ctl_table debug_table[];
203static struct ctl_table dev_table[];
204extern struct ctl_table random_table[];
205#ifdef CONFIG_EPOLL
206extern struct ctl_table epoll_table[];
207#endif
208
209#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
210int sysctl_legacy_va_layout;
211#endif
212
213/* The default sysctl tables: */
214
215static struct ctl_table sysctl_base_table[] = {
216 {
217 .procname = "kernel",
218 .mode = 0555,
219 .child = kern_table,
220 },
221 {
222 .procname = "vm",
223 .mode = 0555,
224 .child = vm_table,
225 },
226 {
227 .procname = "fs",
228 .mode = 0555,
229 .child = fs_table,
230 },
231 {
232 .procname = "debug",
233 .mode = 0555,
234 .child = debug_table,
235 },
236 {
237 .procname = "dev",
238 .mode = 0555,
239 .child = dev_table,
240 },
241 { }
242};
243
244#ifdef CONFIG_SCHED_DEBUG
245static int min_sched_granularity_ns = 100000; /* 100 usecs */
246static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
247static int min_wakeup_granularity_ns; /* 0 usecs */
248static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
249static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
250static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
251#endif
252
253#ifdef CONFIG_COMPACTION
254static int min_extfrag_threshold;
255static int max_extfrag_threshold = 1000;
256#endif
257
258static struct ctl_table kern_table[] = {
259 {
260 .procname = "sched_child_runs_first",
261 .data = &sysctl_sched_child_runs_first,
262 .maxlen = sizeof(unsigned int),
263 .mode = 0644,
264 .proc_handler = proc_dointvec,
265 },
266#ifdef CONFIG_SCHED_DEBUG
267 {
268 .procname = "sched_min_granularity_ns",
269 .data = &sysctl_sched_min_granularity,
270 .maxlen = sizeof(unsigned int),
271 .mode = 0644,
272 .proc_handler = sched_proc_update_handler,
273 .extra1 = &min_sched_granularity_ns,
274 .extra2 = &max_sched_granularity_ns,
275 },
276 {
277 .procname = "sched_latency_ns",
278 .data = &sysctl_sched_latency,
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_wakeup_granularity_ns",
287 .data = &sysctl_sched_wakeup_granularity,
288 .maxlen = sizeof(unsigned int),
289 .mode = 0644,
290 .proc_handler = sched_proc_update_handler,
291 .extra1 = &min_wakeup_granularity_ns,
292 .extra2 = &max_wakeup_granularity_ns,
293 },
294 {
295 .procname = "sched_tunable_scaling",
296 .data = &sysctl_sched_tunable_scaling,
297 .maxlen = sizeof(enum sched_tunable_scaling),
298 .mode = 0644,
299 .proc_handler = sched_proc_update_handler,
300 .extra1 = &min_sched_tunable_scaling,
301 .extra2 = &max_sched_tunable_scaling,
302 },
303 {
304 .procname = "sched_migration_cost",
305 .data = &sysctl_sched_migration_cost,
306 .maxlen = sizeof(unsigned int),
307 .mode = 0644,
308 .proc_handler = proc_dointvec,
309 },
310 {
311 .procname = "sched_nr_migrate",
312 .data = &sysctl_sched_nr_migrate,
313 .maxlen = sizeof(unsigned int),
314 .mode = 0644,
315 .proc_handler = proc_dointvec,
316 },
317 {
318 .procname = "sched_time_avg",
319 .data = &sysctl_sched_time_avg,
320 .maxlen = sizeof(unsigned int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec,
323 },
324 {
325 .procname = "sched_shares_window",
326 .data = &sysctl_sched_shares_window,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec,
330 },
331 {
332 .procname = "timer_migration",
333 .data = &sysctl_timer_migration,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec_minmax,
337 .extra1 = &zero,
338 .extra2 = &one,
339 },
340#endif
341 {
342 .procname = "sched_rt_period_us",
343 .data = &sysctl_sched_rt_period,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = sched_rt_handler,
347 },
348 {
349 .procname = "sched_rt_runtime_us",
350 .data = &sysctl_sched_rt_runtime,
351 .maxlen = sizeof(int),
352 .mode = 0644,
353 .proc_handler = sched_rt_handler,
354 },
355#ifdef CONFIG_SCHED_AUTOGROUP
356 {
357 .procname = "sched_autogroup_enabled",
358 .data = &sysctl_sched_autogroup_enabled,
359 .maxlen = sizeof(unsigned int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec_minmax,
362 .extra1 = &zero,
363 .extra2 = &one,
364 },
365#endif
366#ifdef CONFIG_CFS_BANDWIDTH
367 {
368 .procname = "sched_cfs_bandwidth_slice_us",
369 .data = &sysctl_sched_cfs_bandwidth_slice,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec_minmax,
373 .extra1 = &one,
374 },
375#endif
376#ifdef CONFIG_PROVE_LOCKING
377 {
378 .procname = "prove_locking",
379 .data = &prove_locking,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384#endif
385#ifdef CONFIG_LOCK_STAT
386 {
387 .procname = "lock_stat",
388 .data = &lock_stat,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393#endif
394 {
395 .procname = "panic",
396 .data = &panic_timeout,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec,
400 },
401 {
402 .procname = "core_uses_pid",
403 .data = &core_uses_pid,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec,
407 },
408 {
409 .procname = "core_pattern",
410 .data = core_pattern,
411 .maxlen = CORENAME_MAX_SIZE,
412 .mode = 0644,
413 .proc_handler = proc_dostring,
414 },
415 {
416 .procname = "core_pipe_limit",
417 .data = &core_pipe_limit,
418 .maxlen = sizeof(unsigned int),
419 .mode = 0644,
420 .proc_handler = proc_dointvec,
421 },
422#ifdef CONFIG_PROC_SYSCTL
423 {
424 .procname = "tainted",
425 .maxlen = sizeof(long),
426 .mode = 0644,
427 .proc_handler = proc_taint,
428 },
429#endif
430#ifdef CONFIG_LATENCYTOP
431 {
432 .procname = "latencytop",
433 .data = &latencytop_enabled,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec,
437 },
438#endif
439#ifdef CONFIG_BLK_DEV_INITRD
440 {
441 .procname = "real-root-dev",
442 .data = &real_root_dev,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec,
446 },
447#endif
448 {
449 .procname = "print-fatal-signals",
450 .data = &print_fatal_signals,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec,
454 },
455#ifdef CONFIG_SPARC
456 {
457 .procname = "reboot-cmd",
458 .data = reboot_command,
459 .maxlen = 256,
460 .mode = 0644,
461 .proc_handler = proc_dostring,
462 },
463 {
464 .procname = "stop-a",
465 .data = &stop_a_enabled,
466 .maxlen = sizeof (int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec,
469 },
470 {
471 .procname = "scons-poweroff",
472 .data = &scons_pwroff,
473 .maxlen = sizeof (int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec,
476 },
477#endif
478#ifdef CONFIG_SPARC64
479 {
480 .procname = "tsb-ratio",
481 .data = &sysctl_tsb_ratio,
482 .maxlen = sizeof (int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486#endif
487#ifdef __hppa__
488 {
489 .procname = "soft-power",
490 .data = &pwrsw_enabled,
491 .maxlen = sizeof (int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec,
494 },
495 {
496 .procname = "unaligned-trap",
497 .data = &unaligned_enabled,
498 .maxlen = sizeof (int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec,
501 },
502#endif
503 {
504 .procname = "ctrl-alt-del",
505 .data = &C_A_D,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec,
509 },
510#ifdef CONFIG_FUNCTION_TRACER
511 {
512 .procname = "ftrace_enabled",
513 .data = &ftrace_enabled,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = ftrace_enable_sysctl,
517 },
518#endif
519#ifdef CONFIG_STACK_TRACER
520 {
521 .procname = "stack_tracer_enabled",
522 .data = &stack_tracer_enabled,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = stack_trace_sysctl,
526 },
527#endif
528#ifdef CONFIG_TRACING
529 {
530 .procname = "ftrace_dump_on_oops",
531 .data = &ftrace_dump_on_oops,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = proc_dointvec,
535 },
536#endif
537#ifdef CONFIG_MODULES
538 {
539 .procname = "modprobe",
540 .data = &modprobe_path,
541 .maxlen = KMOD_PATH_LEN,
542 .mode = 0644,
543 .proc_handler = proc_dostring,
544 },
545 {
546 .procname = "modules_disabled",
547 .data = &modules_disabled,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 /* only handle a transition from default "0" to "1" */
551 .proc_handler = proc_dointvec_minmax,
552 .extra1 = &one,
553 .extra2 = &one,
554 },
555#endif
556#ifdef CONFIG_HOTPLUG
557 {
558 .procname = "hotplug",
559 .data = &uevent_helper,
560 .maxlen = UEVENT_HELPER_PATH_LEN,
561 .mode = 0644,
562 .proc_handler = proc_dostring,
563 },
564#endif
565#ifdef CONFIG_CHR_DEV_SG
566 {
567 .procname = "sg-big-buff",
568 .data = &sg_big_buff,
569 .maxlen = sizeof (int),
570 .mode = 0444,
571 .proc_handler = proc_dointvec,
572 },
573#endif
574#ifdef CONFIG_BSD_PROCESS_ACCT
575 {
576 .procname = "acct",
577 .data = &acct_parm,
578 .maxlen = 3*sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582#endif
583#ifdef CONFIG_MAGIC_SYSRQ
584 {
585 .procname = "sysrq",
586 .data = &__sysrq_enabled,
587 .maxlen = sizeof (int),
588 .mode = 0644,
589 .proc_handler = sysrq_sysctl_handler,
590 },
591#endif
592#ifdef CONFIG_PROC_SYSCTL
593 {
594 .procname = "cad_pid",
595 .data = NULL,
596 .maxlen = sizeof (int),
597 .mode = 0600,
598 .proc_handler = proc_do_cad_pid,
599 },
600#endif
601 {
602 .procname = "threads-max",
603 .data = &max_threads,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec,
607 },
608 {
609 .procname = "random",
610 .mode = 0555,
611 .child = random_table,
612 },
613 {
614 .procname = "usermodehelper",
615 .mode = 0555,
616 .child = usermodehelper_table,
617 },
618 {
619 .procname = "overflowuid",
620 .data = &overflowuid,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 .proc_handler = proc_dointvec_minmax,
624 .extra1 = &minolduid,
625 .extra2 = &maxolduid,
626 },
627 {
628 .procname = "overflowgid",
629 .data = &overflowgid,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec_minmax,
633 .extra1 = &minolduid,
634 .extra2 = &maxolduid,
635 },
636#ifdef CONFIG_S390
637#ifdef CONFIG_MATHEMU
638 {
639 .procname = "ieee_emulation_warnings",
640 .data = &sysctl_ieee_emulation_warnings,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec,
644 },
645#endif
646 {
647 .procname = "userprocess_debug",
648 .data = &show_unhandled_signals,
649 .maxlen = sizeof(int),
650 .mode = 0644,
651 .proc_handler = proc_dointvec,
652 },
653#endif
654 {
655 .procname = "pid_max",
656 .data = &pid_max,
657 .maxlen = sizeof (int),
658 .mode = 0644,
659 .proc_handler = proc_dointvec_minmax,
660 .extra1 = &pid_max_min,
661 .extra2 = &pid_max_max,
662 },
663 {
664 .procname = "panic_on_oops",
665 .data = &panic_on_oops,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = proc_dointvec,
669 },
670#if defined CONFIG_PRINTK
671 {
672 .procname = "printk",
673 .data = &console_loglevel,
674 .maxlen = 4*sizeof(int),
675 .mode = 0644,
676 .proc_handler = proc_dointvec,
677 },
678 {
679 .procname = "printk_ratelimit",
680 .data = &printk_ratelimit_state.interval,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = proc_dointvec_jiffies,
684 },
685 {
686 .procname = "printk_ratelimit_burst",
687 .data = &printk_ratelimit_state.burst,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec,
691 },
692 {
693 .procname = "printk_delay",
694 .data = &printk_delay_msec,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = &zero,
699 .extra2 = &ten_thousand,
700 },
701 {
702 .procname = "dmesg_restrict",
703 .data = &dmesg_restrict,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 .proc_handler = proc_dointvec_minmax_sysadmin,
707 .extra1 = &zero,
708 .extra2 = &one,
709 },
710 {
711 .procname = "kptr_restrict",
712 .data = &kptr_restrict,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec_minmax_sysadmin,
716 .extra1 = &zero,
717 .extra2 = &two,
718 },
719#endif
720 {
721 .procname = "ngroups_max",
722 .data = &ngroups_max,
723 .maxlen = sizeof (int),
724 .mode = 0444,
725 .proc_handler = proc_dointvec,
726 },
727 {
728 .procname = "cap_last_cap",
729 .data = (void *)&cap_last_cap,
730 .maxlen = sizeof(int),
731 .mode = 0444,
732 .proc_handler = proc_dointvec,
733 },
734#if defined(CONFIG_LOCKUP_DETECTOR)
735 {
736 .procname = "watchdog",
737 .data = &watchdog_enabled,
738 .maxlen = sizeof (int),
739 .mode = 0644,
740 .proc_handler = proc_dowatchdog,
741 .extra1 = &zero,
742 .extra2 = &one,
743 },
744 {
745 .procname = "watchdog_thresh",
746 .data = &watchdog_thresh,
747 .maxlen = sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dowatchdog,
750 .extra1 = &neg_one,
751 .extra2 = &sixty,
752 },
753 {
754 .procname = "softlockup_panic",
755 .data = &softlockup_panic,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec_minmax,
759 .extra1 = &zero,
760 .extra2 = &one,
761 },
762 {
763 .procname = "nmi_watchdog",
764 .data = &watchdog_enabled,
765 .maxlen = sizeof (int),
766 .mode = 0644,
767 .proc_handler = proc_dowatchdog,
768 .extra1 = &zero,
769 .extra2 = &one,
770 },
771#endif
772#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
773 {
774 .procname = "unknown_nmi_panic",
775 .data = &unknown_nmi_panic,
776 .maxlen = sizeof (int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec,
779 },
780#endif
781#if defined(CONFIG_X86)
782 {
783 .procname = "panic_on_unrecovered_nmi",
784 .data = &panic_on_unrecovered_nmi,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec,
788 },
789 {
790 .procname = "panic_on_io_nmi",
791 .data = &panic_on_io_nmi,
792 .maxlen = sizeof(int),
793 .mode = 0644,
794 .proc_handler = proc_dointvec,
795 },
796#ifdef CONFIG_DEBUG_STACKOVERFLOW
797 {
798 .procname = "panic_on_stackoverflow",
799 .data = &sysctl_panic_on_stackoverflow,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec,
803 },
804#endif
805 {
806 .procname = "bootloader_type",
807 .data = &bootloader_type,
808 .maxlen = sizeof (int),
809 .mode = 0444,
810 .proc_handler = proc_dointvec,
811 },
812 {
813 .procname = "bootloader_version",
814 .data = &bootloader_version,
815 .maxlen = sizeof (int),
816 .mode = 0444,
817 .proc_handler = proc_dointvec,
818 },
819 {
820 .procname = "kstack_depth_to_print",
821 .data = &kstack_depth_to_print,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec,
825 },
826 {
827 .procname = "io_delay_type",
828 .data = &io_delay_type,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec,
832 },
833#endif
834#if defined(CONFIG_MMU)
835 {
836 .procname = "randomize_va_space",
837 .data = &randomize_va_space,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec,
841 },
842#endif
843#if defined(CONFIG_S390) && defined(CONFIG_SMP)
844 {
845 .procname = "spin_retry",
846 .data = &spin_retry,
847 .maxlen = sizeof (int),
848 .mode = 0644,
849 .proc_handler = proc_dointvec,
850 },
851#endif
852#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
853 {
854 .procname = "acpi_video_flags",
855 .data = &acpi_realmode_flags,
856 .maxlen = sizeof (unsigned long),
857 .mode = 0644,
858 .proc_handler = proc_doulongvec_minmax,
859 },
860#endif
861#ifdef CONFIG_IA64
862 {
863 .procname = "ignore-unaligned-usertrap",
864 .data = &no_unaligned_warning,
865 .maxlen = sizeof (int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec,
868 },
869 {
870 .procname = "unaligned-dump-stack",
871 .data = &unaligned_dump_stack,
872 .maxlen = sizeof (int),
873 .mode = 0644,
874 .proc_handler = proc_dointvec,
875 },
876#endif
877#ifdef CONFIG_DETECT_HUNG_TASK
878 {
879 .procname = "hung_task_panic",
880 .data = &sysctl_hung_task_panic,
881 .maxlen = sizeof(int),
882 .mode = 0644,
883 .proc_handler = proc_dointvec_minmax,
884 .extra1 = &zero,
885 .extra2 = &one,
886 },
887 {
888 .procname = "hung_task_check_count",
889 .data = &sysctl_hung_task_check_count,
890 .maxlen = sizeof(unsigned long),
891 .mode = 0644,
892 .proc_handler = proc_doulongvec_minmax,
893 },
894 {
895 .procname = "hung_task_timeout_secs",
896 .data = &sysctl_hung_task_timeout_secs,
897 .maxlen = sizeof(unsigned long),
898 .mode = 0644,
899 .proc_handler = proc_dohung_task_timeout_secs,
900 },
901 {
902 .procname = "hung_task_warnings",
903 .data = &sysctl_hung_task_warnings,
904 .maxlen = sizeof(unsigned long),
905 .mode = 0644,
906 .proc_handler = proc_doulongvec_minmax,
907 },
908#endif
909#ifdef CONFIG_COMPAT
910 {
911 .procname = "compat-log",
912 .data = &compat_log,
913 .maxlen = sizeof (int),
914 .mode = 0644,
915 .proc_handler = proc_dointvec,
916 },
917#endif
918#ifdef CONFIG_RT_MUTEXES
919 {
920 .procname = "max_lock_depth",
921 .data = &max_lock_depth,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec,
925 },
926#endif
927 {
928 .procname = "poweroff_cmd",
929 .data = &poweroff_cmd,
930 .maxlen = POWEROFF_CMD_PATH_LEN,
931 .mode = 0644,
932 .proc_handler = proc_dostring,
933 },
934#ifdef CONFIG_KEYS
935 {
936 .procname = "keys",
937 .mode = 0555,
938 .child = key_sysctls,
939 },
940#endif
941#ifdef CONFIG_RCU_TORTURE_TEST
942 {
943 .procname = "rcutorture_runnable",
944 .data = &rcutorture_runnable,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec,
948 },
949#endif
950#ifdef CONFIG_PERF_EVENTS
951 /*
952 * User-space scripts rely on the existence of this file
953 * as a feature check for perf_events being enabled.
954 *
955 * So it's an ABI, do not remove!
956 */
957 {
958 .procname = "perf_event_paranoid",
959 .data = &sysctl_perf_event_paranoid,
960 .maxlen = sizeof(sysctl_perf_event_paranoid),
961 .mode = 0644,
962 .proc_handler = proc_dointvec,
963 },
964 {
965 .procname = "perf_event_mlock_kb",
966 .data = &sysctl_perf_event_mlock,
967 .maxlen = sizeof(sysctl_perf_event_mlock),
968 .mode = 0644,
969 .proc_handler = proc_dointvec,
970 },
971 {
972 .procname = "perf_event_max_sample_rate",
973 .data = &sysctl_perf_event_sample_rate,
974 .maxlen = sizeof(sysctl_perf_event_sample_rate),
975 .mode = 0644,
976 .proc_handler = perf_proc_update_handler,
977 },
978#endif
979#ifdef CONFIG_KMEMCHECK
980 {
981 .procname = "kmemcheck",
982 .data = &kmemcheck_enabled,
983 .maxlen = sizeof(int),
984 .mode = 0644,
985 .proc_handler = proc_dointvec,
986 },
987#endif
988#ifdef CONFIG_BLOCK
989 {
990 .procname = "blk_iopoll",
991 .data = &blk_iopoll_enabled,
992 .maxlen = sizeof(int),
993 .mode = 0644,
994 .proc_handler = proc_dointvec,
995 },
996#endif
997 { }
998};
999
1000static struct ctl_table vm_table[] = {
1001 {
1002 .procname = "overcommit_memory",
1003 .data = &sysctl_overcommit_memory,
1004 .maxlen = sizeof(sysctl_overcommit_memory),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec_minmax,
1007 .extra1 = &zero,
1008 .extra2 = &two,
1009 },
1010 {
1011 .procname = "panic_on_oom",
1012 .data = &sysctl_panic_on_oom,
1013 .maxlen = sizeof(sysctl_panic_on_oom),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec_minmax,
1016 .extra1 = &zero,
1017 .extra2 = &two,
1018 },
1019 {
1020 .procname = "oom_kill_allocating_task",
1021 .data = &sysctl_oom_kill_allocating_task,
1022 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1023 .mode = 0644,
1024 .proc_handler = proc_dointvec,
1025 },
1026 {
1027 .procname = "oom_dump_tasks",
1028 .data = &sysctl_oom_dump_tasks,
1029 .maxlen = sizeof(sysctl_oom_dump_tasks),
1030 .mode = 0644,
1031 .proc_handler = proc_dointvec,
1032 },
1033 {
1034 .procname = "overcommit_ratio",
1035 .data = &sysctl_overcommit_ratio,
1036 .maxlen = sizeof(sysctl_overcommit_ratio),
1037 .mode = 0644,
1038 .proc_handler = proc_dointvec,
1039 },
1040 {
1041 .procname = "page-cluster",
1042 .data = &page_cluster,
1043 .maxlen = sizeof(int),
1044 .mode = 0644,
1045 .proc_handler = proc_dointvec_minmax,
1046 .extra1 = &zero,
1047 },
1048 {
1049 .procname = "dirty_background_ratio",
1050 .data = &dirty_background_ratio,
1051 .maxlen = sizeof(dirty_background_ratio),
1052 .mode = 0644,
1053 .proc_handler = dirty_background_ratio_handler,
1054 .extra1 = &zero,
1055 .extra2 = &one_hundred,
1056 },
1057 {
1058 .procname = "dirty_background_bytes",
1059 .data = &dirty_background_bytes,
1060 .maxlen = sizeof(dirty_background_bytes),
1061 .mode = 0644,
1062 .proc_handler = dirty_background_bytes_handler,
1063 .extra1 = &one_ul,
1064 },
1065 {
1066 .procname = "dirty_ratio",
1067 .data = &vm_dirty_ratio,
1068 .maxlen = sizeof(vm_dirty_ratio),
1069 .mode = 0644,
1070 .proc_handler = dirty_ratio_handler,
1071 .extra1 = &zero,
1072 .extra2 = &one_hundred,
1073 },
1074 {
1075 .procname = "dirty_bytes",
1076 .data = &vm_dirty_bytes,
1077 .maxlen = sizeof(vm_dirty_bytes),
1078 .mode = 0644,
1079 .proc_handler = dirty_bytes_handler,
1080 .extra1 = &dirty_bytes_min,
1081 },
1082 {
1083 .procname = "dirty_writeback_centisecs",
1084 .data = &dirty_writeback_interval,
1085 .maxlen = sizeof(dirty_writeback_interval),
1086 .mode = 0644,
1087 .proc_handler = dirty_writeback_centisecs_handler,
1088 },
1089 {
1090 .procname = "dirty_expire_centisecs",
1091 .data = &dirty_expire_interval,
1092 .maxlen = sizeof(dirty_expire_interval),
1093 .mode = 0644,
1094 .proc_handler = proc_dointvec_minmax,
1095 .extra1 = &zero,
1096 },
1097 {
1098 .procname = "nr_pdflush_threads",
1099 .data = &nr_pdflush_threads,
1100 .maxlen = sizeof nr_pdflush_threads,
1101 .mode = 0444 /* read-only*/,
1102 .proc_handler = proc_dointvec,
1103 },
1104 {
1105 .procname = "swappiness",
1106 .data = &vm_swappiness,
1107 .maxlen = sizeof(vm_swappiness),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec_minmax,
1110 .extra1 = &zero,
1111 .extra2 = &one_hundred,
1112 },
1113#ifdef CONFIG_HUGETLB_PAGE
1114 {
1115 .procname = "nr_hugepages",
1116 .data = NULL,
1117 .maxlen = sizeof(unsigned long),
1118 .mode = 0644,
1119 .proc_handler = hugetlb_sysctl_handler,
1120 .extra1 = (void *)&hugetlb_zero,
1121 .extra2 = (void *)&hugetlb_infinity,
1122 },
1123#ifdef CONFIG_NUMA
1124 {
1125 .procname = "nr_hugepages_mempolicy",
1126 .data = NULL,
1127 .maxlen = sizeof(unsigned long),
1128 .mode = 0644,
1129 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1130 .extra1 = (void *)&hugetlb_zero,
1131 .extra2 = (void *)&hugetlb_infinity,
1132 },
1133#endif
1134 {
1135 .procname = "hugetlb_shm_group",
1136 .data = &sysctl_hugetlb_shm_group,
1137 .maxlen = sizeof(gid_t),
1138 .mode = 0644,
1139 .proc_handler = proc_dointvec,
1140 },
1141 {
1142 .procname = "hugepages_treat_as_movable",
1143 .data = &hugepages_treat_as_movable,
1144 .maxlen = sizeof(int),
1145 .mode = 0644,
1146 .proc_handler = hugetlb_treat_movable_handler,
1147 },
1148 {
1149 .procname = "nr_overcommit_hugepages",
1150 .data = NULL,
1151 .maxlen = sizeof(unsigned long),
1152 .mode = 0644,
1153 .proc_handler = hugetlb_overcommit_handler,
1154 .extra1 = (void *)&hugetlb_zero,
1155 .extra2 = (void *)&hugetlb_infinity,
1156 },
1157#endif
1158 {
1159 .procname = "lowmem_reserve_ratio",
1160 .data = &sysctl_lowmem_reserve_ratio,
1161 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1162 .mode = 0644,
1163 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1164 },
1165 {
1166 .procname = "drop_caches",
1167 .data = &sysctl_drop_caches,
1168 .maxlen = sizeof(int),
1169 .mode = 0644,
1170 .proc_handler = drop_caches_sysctl_handler,
1171 .extra1 = &one,
1172 .extra2 = &three,
1173 },
1174#ifdef CONFIG_COMPACTION
1175 {
1176 .procname = "compact_memory",
1177 .data = &sysctl_compact_memory,
1178 .maxlen = sizeof(int),
1179 .mode = 0200,
1180 .proc_handler = sysctl_compaction_handler,
1181 },
1182 {
1183 .procname = "extfrag_threshold",
1184 .data = &sysctl_extfrag_threshold,
1185 .maxlen = sizeof(int),
1186 .mode = 0644,
1187 .proc_handler = sysctl_extfrag_handler,
1188 .extra1 = &min_extfrag_threshold,
1189 .extra2 = &max_extfrag_threshold,
1190 },
1191
1192#endif /* CONFIG_COMPACTION */
1193 {
1194 .procname = "min_free_kbytes",
1195 .data = &min_free_kbytes,
1196 .maxlen = sizeof(min_free_kbytes),
1197 .mode = 0644,
1198 .proc_handler = min_free_kbytes_sysctl_handler,
1199 .extra1 = &zero,
1200 },
1201 {
1202 .procname = "percpu_pagelist_fraction",
1203 .data = &percpu_pagelist_fraction,
1204 .maxlen = sizeof(percpu_pagelist_fraction),
1205 .mode = 0644,
1206 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1207 .extra1 = &min_percpu_pagelist_fract,
1208 },
1209#ifdef CONFIG_MMU
1210 {
1211 .procname = "max_map_count",
1212 .data = &sysctl_max_map_count,
1213 .maxlen = sizeof(sysctl_max_map_count),
1214 .mode = 0644,
1215 .proc_handler = proc_dointvec_minmax,
1216 .extra1 = &zero,
1217 },
1218#else
1219 {
1220 .procname = "nr_trim_pages",
1221 .data = &sysctl_nr_trim_pages,
1222 .maxlen = sizeof(sysctl_nr_trim_pages),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec_minmax,
1225 .extra1 = &zero,
1226 },
1227#endif
1228 {
1229 .procname = "laptop_mode",
1230 .data = &laptop_mode,
1231 .maxlen = sizeof(laptop_mode),
1232 .mode = 0644,
1233 .proc_handler = proc_dointvec_jiffies,
1234 },
1235 {
1236 .procname = "block_dump",
1237 .data = &block_dump,
1238 .maxlen = sizeof(block_dump),
1239 .mode = 0644,
1240 .proc_handler = proc_dointvec,
1241 .extra1 = &zero,
1242 },
1243 {
1244 .procname = "vfs_cache_pressure",
1245 .data = &sysctl_vfs_cache_pressure,
1246 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1247 .mode = 0644,
1248 .proc_handler = proc_dointvec,
1249 .extra1 = &zero,
1250 },
1251#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1252 {
1253 .procname = "legacy_va_layout",
1254 .data = &sysctl_legacy_va_layout,
1255 .maxlen = sizeof(sysctl_legacy_va_layout),
1256 .mode = 0644,
1257 .proc_handler = proc_dointvec,
1258 .extra1 = &zero,
1259 },
1260#endif
1261#ifdef CONFIG_NUMA
1262 {
1263 .procname = "zone_reclaim_mode",
1264 .data = &zone_reclaim_mode,
1265 .maxlen = sizeof(zone_reclaim_mode),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec,
1268 .extra1 = &zero,
1269 },
1270 {
1271 .procname = "min_unmapped_ratio",
1272 .data = &sysctl_min_unmapped_ratio,
1273 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1274 .mode = 0644,
1275 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1276 .extra1 = &zero,
1277 .extra2 = &one_hundred,
1278 },
1279 {
1280 .procname = "min_slab_ratio",
1281 .data = &sysctl_min_slab_ratio,
1282 .maxlen = sizeof(sysctl_min_slab_ratio),
1283 .mode = 0644,
1284 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1285 .extra1 = &zero,
1286 .extra2 = &one_hundred,
1287 },
1288#endif
1289#ifdef CONFIG_SMP
1290 {
1291 .procname = "stat_interval",
1292 .data = &sysctl_stat_interval,
1293 .maxlen = sizeof(sysctl_stat_interval),
1294 .mode = 0644,
1295 .proc_handler = proc_dointvec_jiffies,
1296 },
1297#endif
1298#ifdef CONFIG_MMU
1299 {
1300 .procname = "mmap_min_addr",
1301 .data = &dac_mmap_min_addr,
1302 .maxlen = sizeof(unsigned long),
1303 .mode = 0644,
1304 .proc_handler = mmap_min_addr_handler,
1305 },
1306#endif
1307#ifdef CONFIG_NUMA
1308 {
1309 .procname = "numa_zonelist_order",
1310 .data = &numa_zonelist_order,
1311 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1312 .mode = 0644,
1313 .proc_handler = numa_zonelist_order_handler,
1314 },
1315#endif
1316#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1317 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1318 {
1319 .procname = "vdso_enabled",
1320 .data = &vdso_enabled,
1321 .maxlen = sizeof(vdso_enabled),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec,
1324 .extra1 = &zero,
1325 },
1326#endif
1327#ifdef CONFIG_HIGHMEM
1328 {
1329 .procname = "highmem_is_dirtyable",
1330 .data = &vm_highmem_is_dirtyable,
1331 .maxlen = sizeof(vm_highmem_is_dirtyable),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec_minmax,
1334 .extra1 = &zero,
1335 .extra2 = &one,
1336 },
1337#endif
1338 {
1339 .procname = "scan_unevictable_pages",
1340 .data = &scan_unevictable_pages,
1341 .maxlen = sizeof(scan_unevictable_pages),
1342 .mode = 0644,
1343 .proc_handler = scan_unevictable_handler,
1344 },
1345#ifdef CONFIG_MEMORY_FAILURE
1346 {
1347 .procname = "memory_failure_early_kill",
1348 .data = &sysctl_memory_failure_early_kill,
1349 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1350 .mode = 0644,
1351 .proc_handler = proc_dointvec_minmax,
1352 .extra1 = &zero,
1353 .extra2 = &one,
1354 },
1355 {
1356 .procname = "memory_failure_recovery",
1357 .data = &sysctl_memory_failure_recovery,
1358 .maxlen = sizeof(sysctl_memory_failure_recovery),
1359 .mode = 0644,
1360 .proc_handler = proc_dointvec_minmax,
1361 .extra1 = &zero,
1362 .extra2 = &one,
1363 },
1364#endif
1365 { }
1366};
1367
1368#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1369static struct ctl_table binfmt_misc_table[] = {
1370 { }
1371};
1372#endif
1373
1374static struct ctl_table fs_table[] = {
1375 {
1376 .procname = "inode-nr",
1377 .data = &inodes_stat,
1378 .maxlen = 2*sizeof(int),
1379 .mode = 0444,
1380 .proc_handler = proc_nr_inodes,
1381 },
1382 {
1383 .procname = "inode-state",
1384 .data = &inodes_stat,
1385 .maxlen = 7*sizeof(int),
1386 .mode = 0444,
1387 .proc_handler = proc_nr_inodes,
1388 },
1389 {
1390 .procname = "file-nr",
1391 .data = &files_stat,
1392 .maxlen = sizeof(files_stat),
1393 .mode = 0444,
1394 .proc_handler = proc_nr_files,
1395 },
1396 {
1397 .procname = "file-max",
1398 .data = &files_stat.max_files,
1399 .maxlen = sizeof(files_stat.max_files),
1400 .mode = 0644,
1401 .proc_handler = proc_doulongvec_minmax,
1402 },
1403 {
1404 .procname = "nr_open",
1405 .data = &sysctl_nr_open,
1406 .maxlen = sizeof(int),
1407 .mode = 0644,
1408 .proc_handler = proc_dointvec_minmax,
1409 .extra1 = &sysctl_nr_open_min,
1410 .extra2 = &sysctl_nr_open_max,
1411 },
1412 {
1413 .procname = "dentry-state",
1414 .data = &dentry_stat,
1415 .maxlen = 6*sizeof(int),
1416 .mode = 0444,
1417 .proc_handler = proc_nr_dentry,
1418 },
1419 {
1420 .procname = "overflowuid",
1421 .data = &fs_overflowuid,
1422 .maxlen = sizeof(int),
1423 .mode = 0644,
1424 .proc_handler = proc_dointvec_minmax,
1425 .extra1 = &minolduid,
1426 .extra2 = &maxolduid,
1427 },
1428 {
1429 .procname = "overflowgid",
1430 .data = &fs_overflowgid,
1431 .maxlen = sizeof(int),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec_minmax,
1434 .extra1 = &minolduid,
1435 .extra2 = &maxolduid,
1436 },
1437#ifdef CONFIG_FILE_LOCKING
1438 {
1439 .procname = "leases-enable",
1440 .data = &leases_enable,
1441 .maxlen = sizeof(int),
1442 .mode = 0644,
1443 .proc_handler = proc_dointvec,
1444 },
1445#endif
1446#ifdef CONFIG_DNOTIFY
1447 {
1448 .procname = "dir-notify-enable",
1449 .data = &dir_notify_enable,
1450 .maxlen = sizeof(int),
1451 .mode = 0644,
1452 .proc_handler = proc_dointvec,
1453 },
1454#endif
1455#ifdef CONFIG_MMU
1456#ifdef CONFIG_FILE_LOCKING
1457 {
1458 .procname = "lease-break-time",
1459 .data = &lease_break_time,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec,
1463 },
1464#endif
1465#ifdef CONFIG_AIO
1466 {
1467 .procname = "aio-nr",
1468 .data = &aio_nr,
1469 .maxlen = sizeof(aio_nr),
1470 .mode = 0444,
1471 .proc_handler = proc_doulongvec_minmax,
1472 },
1473 {
1474 .procname = "aio-max-nr",
1475 .data = &aio_max_nr,
1476 .maxlen = sizeof(aio_max_nr),
1477 .mode = 0644,
1478 .proc_handler = proc_doulongvec_minmax,
1479 },
1480#endif /* CONFIG_AIO */
1481#ifdef CONFIG_INOTIFY_USER
1482 {
1483 .procname = "inotify",
1484 .mode = 0555,
1485 .child = inotify_table,
1486 },
1487#endif
1488#ifdef CONFIG_EPOLL
1489 {
1490 .procname = "epoll",
1491 .mode = 0555,
1492 .child = epoll_table,
1493 },
1494#endif
1495#endif
1496 {
1497 .procname = "suid_dumpable",
1498 .data = &suid_dumpable,
1499 .maxlen = sizeof(int),
1500 .mode = 0644,
1501 .proc_handler = proc_dointvec_minmax,
1502 .extra1 = &zero,
1503 .extra2 = &two,
1504 },
1505#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1506 {
1507 .procname = "binfmt_misc",
1508 .mode = 0555,
1509 .child = binfmt_misc_table,
1510 },
1511#endif
1512 {
1513 .procname = "pipe-max-size",
1514 .data = &pipe_max_size,
1515 .maxlen = sizeof(int),
1516 .mode = 0644,
1517 .proc_handler = &pipe_proc_fn,
1518 .extra1 = &pipe_min_size,
1519 },
1520 { }
1521};
1522
1523static struct ctl_table debug_table[] = {
1524#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1525 defined(CONFIG_S390) || defined(CONFIG_TILE)
1526 {
1527 .procname = "exception-trace",
1528 .data = &show_unhandled_signals,
1529 .maxlen = sizeof(int),
1530 .mode = 0644,
1531 .proc_handler = proc_dointvec
1532 },
1533#endif
1534#if defined(CONFIG_OPTPROBES)
1535 {
1536 .procname = "kprobes-optimization",
1537 .data = &sysctl_kprobes_optimization,
1538 .maxlen = sizeof(int),
1539 .mode = 0644,
1540 .proc_handler = proc_kprobes_optimization_handler,
1541 .extra1 = &zero,
1542 .extra2 = &one,
1543 },
1544#endif
1545 { }
1546};
1547
1548static struct ctl_table dev_table[] = {
1549 { }
1550};
1551
1552int __init sysctl_init(void)
1553{
1554 register_sysctl_table(sysctl_base_table);
1555 return 0;
1556}
1557
1558#endif /* CONFIG_SYSCTL */
1559
1560/*
1561 * /proc/sys support
1562 */
1563
1564#ifdef CONFIG_PROC_SYSCTL
1565
1566static int _proc_do_string(void* data, int maxlen, int write,
1567 void __user *buffer,
1568 size_t *lenp, loff_t *ppos)
1569{
1570 size_t len;
1571 char __user *p;
1572 char c;
1573
1574 if (!data || !maxlen || !*lenp) {
1575 *lenp = 0;
1576 return 0;
1577 }
1578
1579 if (write) {
1580 len = 0;
1581 p = buffer;
1582 while (len < *lenp) {
1583 if (get_user(c, p++))
1584 return -EFAULT;
1585 if (c == 0 || c == '\n')
1586 break;
1587 len++;
1588 }
1589 if (len >= maxlen)
1590 len = maxlen-1;
1591 if(copy_from_user(data, buffer, len))
1592 return -EFAULT;
1593 ((char *) data)[len] = 0;
1594 *ppos += *lenp;
1595 } else {
1596 len = strlen(data);
1597 if (len > maxlen)
1598 len = maxlen;
1599
1600 if (*ppos > len) {
1601 *lenp = 0;
1602 return 0;
1603 }
1604
1605 data += *ppos;
1606 len -= *ppos;
1607
1608 if (len > *lenp)
1609 len = *lenp;
1610 if (len)
1611 if(copy_to_user(buffer, data, len))
1612 return -EFAULT;
1613 if (len < *lenp) {
1614 if(put_user('\n', ((char __user *) buffer) + len))
1615 return -EFAULT;
1616 len++;
1617 }
1618 *lenp = len;
1619 *ppos += len;
1620 }
1621 return 0;
1622}
1623
1624/**
1625 * proc_dostring - read a string sysctl
1626 * @table: the sysctl table
1627 * @write: %TRUE if this is a write to the sysctl file
1628 * @buffer: the user buffer
1629 * @lenp: the size of the user buffer
1630 * @ppos: file position
1631 *
1632 * Reads/writes a string from/to the user buffer. If the kernel
1633 * buffer provided is not large enough to hold the string, the
1634 * string is truncated. The copied string is %NULL-terminated.
1635 * If the string is being read by the user process, it is copied
1636 * and a newline '\n' is added. It is truncated if the buffer is
1637 * not large enough.
1638 *
1639 * Returns 0 on success.
1640 */
1641int proc_dostring(struct ctl_table *table, int write,
1642 void __user *buffer, size_t *lenp, loff_t *ppos)
1643{
1644 return _proc_do_string(table->data, table->maxlen, write,
1645 buffer, lenp, ppos);
1646}
1647
1648static size_t proc_skip_spaces(char **buf)
1649{
1650 size_t ret;
1651 char *tmp = skip_spaces(*buf);
1652 ret = tmp - *buf;
1653 *buf = tmp;
1654 return ret;
1655}
1656
1657static void proc_skip_char(char **buf, size_t *size, const char v)
1658{
1659 while (*size) {
1660 if (**buf != v)
1661 break;
1662 (*size)--;
1663 (*buf)++;
1664 }
1665}
1666
1667#define TMPBUFLEN 22
1668/**
1669 * proc_get_long - reads an ASCII formatted integer from a user buffer
1670 *
1671 * @buf: a kernel buffer
1672 * @size: size of the kernel buffer
1673 * @val: this is where the number will be stored
1674 * @neg: set to %TRUE if number is negative
1675 * @perm_tr: a vector which contains the allowed trailers
1676 * @perm_tr_len: size of the perm_tr vector
1677 * @tr: pointer to store the trailer character
1678 *
1679 * In case of success %0 is returned and @buf and @size are updated with
1680 * the amount of bytes read. If @tr is non-NULL and a trailing
1681 * character exists (size is non-zero after returning from this
1682 * function), @tr is updated with the trailing character.
1683 */
1684static int proc_get_long(char **buf, size_t *size,
1685 unsigned long *val, bool *neg,
1686 const char *perm_tr, unsigned perm_tr_len, char *tr)
1687{
1688 int len;
1689 char *p, tmp[TMPBUFLEN];
1690
1691 if (!*size)
1692 return -EINVAL;
1693
1694 len = *size;
1695 if (len > TMPBUFLEN - 1)
1696 len = TMPBUFLEN - 1;
1697
1698 memcpy(tmp, *buf, len);
1699
1700 tmp[len] = 0;
1701 p = tmp;
1702 if (*p == '-' && *size > 1) {
1703 *neg = true;
1704 p++;
1705 } else
1706 *neg = false;
1707 if (!isdigit(*p))
1708 return -EINVAL;
1709
1710 *val = simple_strtoul(p, &p, 0);
1711
1712 len = p - tmp;
1713
1714 /* We don't know if the next char is whitespace thus we may accept
1715 * invalid integers (e.g. 1234...a) or two integers instead of one
1716 * (e.g. 123...1). So lets not allow such large numbers. */
1717 if (len == TMPBUFLEN - 1)
1718 return -EINVAL;
1719
1720 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1721 return -EINVAL;
1722
1723 if (tr && (len < *size))
1724 *tr = *p;
1725
1726 *buf += len;
1727 *size -= len;
1728
1729 return 0;
1730}
1731
1732/**
1733 * proc_put_long - converts an integer to a decimal ASCII formatted string
1734 *
1735 * @buf: the user buffer
1736 * @size: the size of the user buffer
1737 * @val: the integer to be converted
1738 * @neg: sign of the number, %TRUE for negative
1739 *
1740 * In case of success %0 is returned and @buf and @size are updated with
1741 * the amount of bytes written.
1742 */
1743static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1744 bool neg)
1745{
1746 int len;
1747 char tmp[TMPBUFLEN], *p = tmp;
1748
1749 sprintf(p, "%s%lu", neg ? "-" : "", val);
1750 len = strlen(tmp);
1751 if (len > *size)
1752 len = *size;
1753 if (copy_to_user(*buf, tmp, len))
1754 return -EFAULT;
1755 *size -= len;
1756 *buf += len;
1757 return 0;
1758}
1759#undef TMPBUFLEN
1760
1761static int proc_put_char(void __user **buf, size_t *size, char c)
1762{
1763 if (*size) {
1764 char __user **buffer = (char __user **)buf;
1765 if (put_user(c, *buffer))
1766 return -EFAULT;
1767 (*size)--, (*buffer)++;
1768 *buf = *buffer;
1769 }
1770 return 0;
1771}
1772
1773static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1774 int *valp,
1775 int write, void *data)
1776{
1777 if (write) {
1778 *valp = *negp ? -*lvalp : *lvalp;
1779 } else {
1780 int val = *valp;
1781 if (val < 0) {
1782 *negp = true;
1783 *lvalp = (unsigned long)-val;
1784 } else {
1785 *negp = false;
1786 *lvalp = (unsigned long)val;
1787 }
1788 }
1789 return 0;
1790}
1791
1792static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1793
1794static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1795 int write, void __user *buffer,
1796 size_t *lenp, loff_t *ppos,
1797 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1798 int write, void *data),
1799 void *data)
1800{
1801 int *i, vleft, first = 1, err = 0;
1802 unsigned long page = 0;
1803 size_t left;
1804 char *kbuf;
1805
1806 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1807 *lenp = 0;
1808 return 0;
1809 }
1810
1811 i = (int *) tbl_data;
1812 vleft = table->maxlen / sizeof(*i);
1813 left = *lenp;
1814
1815 if (!conv)
1816 conv = do_proc_dointvec_conv;
1817
1818 if (write) {
1819 if (left > PAGE_SIZE - 1)
1820 left = PAGE_SIZE - 1;
1821 page = __get_free_page(GFP_TEMPORARY);
1822 kbuf = (char *) page;
1823 if (!kbuf)
1824 return -ENOMEM;
1825 if (copy_from_user(kbuf, buffer, left)) {
1826 err = -EFAULT;
1827 goto free;
1828 }
1829 kbuf[left] = 0;
1830 }
1831
1832 for (; left && vleft--; i++, first=0) {
1833 unsigned long lval;
1834 bool neg;
1835
1836 if (write) {
1837 left -= proc_skip_spaces(&kbuf);
1838
1839 if (!left)
1840 break;
1841 err = proc_get_long(&kbuf, &left, &lval, &neg,
1842 proc_wspace_sep,
1843 sizeof(proc_wspace_sep), NULL);
1844 if (err)
1845 break;
1846 if (conv(&neg, &lval, i, 1, data)) {
1847 err = -EINVAL;
1848 break;
1849 }
1850 } else {
1851 if (conv(&neg, &lval, i, 0, data)) {
1852 err = -EINVAL;
1853 break;
1854 }
1855 if (!first)
1856 err = proc_put_char(&buffer, &left, '\t');
1857 if (err)
1858 break;
1859 err = proc_put_long(&buffer, &left, lval, neg);
1860 if (err)
1861 break;
1862 }
1863 }
1864
1865 if (!write && !first && left && !err)
1866 err = proc_put_char(&buffer, &left, '\n');
1867 if (write && !err && left)
1868 left -= proc_skip_spaces(&kbuf);
1869free:
1870 if (write) {
1871 free_page(page);
1872 if (first)
1873 return err ? : -EINVAL;
1874 }
1875 *lenp -= left;
1876 *ppos += *lenp;
1877 return err;
1878}
1879
1880static int do_proc_dointvec(struct ctl_table *table, int write,
1881 void __user *buffer, size_t *lenp, loff_t *ppos,
1882 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1883 int write, void *data),
1884 void *data)
1885{
1886 return __do_proc_dointvec(table->data, table, write,
1887 buffer, lenp, ppos, conv, data);
1888}
1889
1890/**
1891 * proc_dointvec - read a vector of integers
1892 * @table: the sysctl table
1893 * @write: %TRUE if this is a write to the sysctl file
1894 * @buffer: the user buffer
1895 * @lenp: the size of the user buffer
1896 * @ppos: file position
1897 *
1898 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1899 * values from/to the user buffer, treated as an ASCII string.
1900 *
1901 * Returns 0 on success.
1902 */
1903int proc_dointvec(struct ctl_table *table, int write,
1904 void __user *buffer, size_t *lenp, loff_t *ppos)
1905{
1906 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1907 NULL,NULL);
1908}
1909
1910/*
1911 * Taint values can only be increased
1912 * This means we can safely use a temporary.
1913 */
1914static int proc_taint(struct ctl_table *table, int write,
1915 void __user *buffer, size_t *lenp, loff_t *ppos)
1916{
1917 struct ctl_table t;
1918 unsigned long tmptaint = get_taint();
1919 int err;
1920
1921 if (write && !capable(CAP_SYS_ADMIN))
1922 return -EPERM;
1923
1924 t = *table;
1925 t.data = &tmptaint;
1926 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1927 if (err < 0)
1928 return err;
1929
1930 if (write) {
1931 /*
1932 * Poor man's atomic or. Not worth adding a primitive
1933 * to everyone's atomic.h for this
1934 */
1935 int i;
1936 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1937 if ((tmptaint >> i) & 1)
1938 add_taint(i);
1939 }
1940 }
1941
1942 return err;
1943}
1944
1945#ifdef CONFIG_PRINTK
1946static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1947 void __user *buffer, size_t *lenp, loff_t *ppos)
1948{
1949 if (write && !capable(CAP_SYS_ADMIN))
1950 return -EPERM;
1951
1952 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1953}
1954#endif
1955
1956struct do_proc_dointvec_minmax_conv_param {
1957 int *min;
1958 int *max;
1959};
1960
1961static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1962 int *valp,
1963 int write, void *data)
1964{
1965 struct do_proc_dointvec_minmax_conv_param *param = data;
1966 if (write) {
1967 int val = *negp ? -*lvalp : *lvalp;
1968 if ((param->min && *param->min > val) ||
1969 (param->max && *param->max < val))
1970 return -EINVAL;
1971 *valp = val;
1972 } else {
1973 int val = *valp;
1974 if (val < 0) {
1975 *negp = true;
1976 *lvalp = (unsigned long)-val;
1977 } else {
1978 *negp = false;
1979 *lvalp = (unsigned long)val;
1980 }
1981 }
1982 return 0;
1983}
1984
1985/**
1986 * proc_dointvec_minmax - read a vector of integers with min/max values
1987 * @table: the sysctl table
1988 * @write: %TRUE if this is a write to the sysctl file
1989 * @buffer: the user buffer
1990 * @lenp: the size of the user buffer
1991 * @ppos: file position
1992 *
1993 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1994 * values from/to the user buffer, treated as an ASCII string.
1995 *
1996 * This routine will ensure the values are within the range specified by
1997 * table->extra1 (min) and table->extra2 (max).
1998 *
1999 * Returns 0 on success.
2000 */
2001int proc_dointvec_minmax(struct ctl_table *table, int write,
2002 void __user *buffer, size_t *lenp, loff_t *ppos)
2003{
2004 struct do_proc_dointvec_minmax_conv_param param = {
2005 .min = (int *) table->extra1,
2006 .max = (int *) table->extra2,
2007 };
2008 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2009 do_proc_dointvec_minmax_conv, ¶m);
2010}
2011
2012static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2013 void __user *buffer,
2014 size_t *lenp, loff_t *ppos,
2015 unsigned long convmul,
2016 unsigned long convdiv)
2017{
2018 unsigned long *i, *min, *max;
2019 int vleft, first = 1, err = 0;
2020 unsigned long page = 0;
2021 size_t left;
2022 char *kbuf;
2023
2024 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2025 *lenp = 0;
2026 return 0;
2027 }
2028
2029 i = (unsigned long *) data;
2030 min = (unsigned long *) table->extra1;
2031 max = (unsigned long *) table->extra2;
2032 vleft = table->maxlen / sizeof(unsigned long);
2033 left = *lenp;
2034
2035 if (write) {
2036 if (left > PAGE_SIZE - 1)
2037 left = PAGE_SIZE - 1;
2038 page = __get_free_page(GFP_TEMPORARY);
2039 kbuf = (char *) page;
2040 if (!kbuf)
2041 return -ENOMEM;
2042 if (copy_from_user(kbuf, buffer, left)) {
2043 err = -EFAULT;
2044 goto free;
2045 }
2046 kbuf[left] = 0;
2047 }
2048
2049 for (; left && vleft--; i++, first = 0) {
2050 unsigned long val;
2051
2052 if (write) {
2053 bool neg;
2054
2055 left -= proc_skip_spaces(&kbuf);
2056
2057 err = proc_get_long(&kbuf, &left, &val, &neg,
2058 proc_wspace_sep,
2059 sizeof(proc_wspace_sep), NULL);
2060 if (err)
2061 break;
2062 if (neg)
2063 continue;
2064 if ((min && val < *min) || (max && val > *max))
2065 continue;
2066 *i = val;
2067 } else {
2068 val = convdiv * (*i) / convmul;
2069 if (!first)
2070 err = proc_put_char(&buffer, &left, '\t');
2071 err = proc_put_long(&buffer, &left, val, false);
2072 if (err)
2073 break;
2074 }
2075 }
2076
2077 if (!write && !first && left && !err)
2078 err = proc_put_char(&buffer, &left, '\n');
2079 if (write && !err)
2080 left -= proc_skip_spaces(&kbuf);
2081free:
2082 if (write) {
2083 free_page(page);
2084 if (first)
2085 return err ? : -EINVAL;
2086 }
2087 *lenp -= left;
2088 *ppos += *lenp;
2089 return err;
2090}
2091
2092static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2093 void __user *buffer,
2094 size_t *lenp, loff_t *ppos,
2095 unsigned long convmul,
2096 unsigned long convdiv)
2097{
2098 return __do_proc_doulongvec_minmax(table->data, table, write,
2099 buffer, lenp, ppos, convmul, convdiv);
2100}
2101
2102/**
2103 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2104 * @table: the sysctl table
2105 * @write: %TRUE if this is a write to the sysctl file
2106 * @buffer: the user buffer
2107 * @lenp: the size of the user buffer
2108 * @ppos: file position
2109 *
2110 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2111 * values from/to the user buffer, treated as an ASCII string.
2112 *
2113 * This routine will ensure the values are within the range specified by
2114 * table->extra1 (min) and table->extra2 (max).
2115 *
2116 * Returns 0 on success.
2117 */
2118int proc_doulongvec_minmax(struct ctl_table *table, int write,
2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2120{
2121 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2122}
2123
2124/**
2125 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2126 * @table: the sysctl table
2127 * @write: %TRUE if this is a write to the sysctl file
2128 * @buffer: the user buffer
2129 * @lenp: the size of the user buffer
2130 * @ppos: file position
2131 *
2132 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2133 * values from/to the user buffer, treated as an ASCII string. The values
2134 * are treated as milliseconds, and converted to jiffies when they are stored.
2135 *
2136 * This routine will ensure the values are within the range specified by
2137 * table->extra1 (min) and table->extra2 (max).
2138 *
2139 * Returns 0 on success.
2140 */
2141int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2142 void __user *buffer,
2143 size_t *lenp, loff_t *ppos)
2144{
2145 return do_proc_doulongvec_minmax(table, write, buffer,
2146 lenp, ppos, HZ, 1000l);
2147}
2148
2149
2150static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2151 int *valp,
2152 int write, void *data)
2153{
2154 if (write) {
2155 if (*lvalp > LONG_MAX / HZ)
2156 return 1;
2157 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2158 } else {
2159 int val = *valp;
2160 unsigned long lval;
2161 if (val < 0) {
2162 *negp = true;
2163 lval = (unsigned long)-val;
2164 } else {
2165 *negp = false;
2166 lval = (unsigned long)val;
2167 }
2168 *lvalp = lval / HZ;
2169 }
2170 return 0;
2171}
2172
2173static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2174 int *valp,
2175 int write, void *data)
2176{
2177 if (write) {
2178 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2179 return 1;
2180 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2181 } else {
2182 int val = *valp;
2183 unsigned long lval;
2184 if (val < 0) {
2185 *negp = true;
2186 lval = (unsigned long)-val;
2187 } else {
2188 *negp = false;
2189 lval = (unsigned long)val;
2190 }
2191 *lvalp = jiffies_to_clock_t(lval);
2192 }
2193 return 0;
2194}
2195
2196static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2197 int *valp,
2198 int write, void *data)
2199{
2200 if (write) {
2201 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2202 } else {
2203 int val = *valp;
2204 unsigned long lval;
2205 if (val < 0) {
2206 *negp = true;
2207 lval = (unsigned long)-val;
2208 } else {
2209 *negp = false;
2210 lval = (unsigned long)val;
2211 }
2212 *lvalp = jiffies_to_msecs(lval);
2213 }
2214 return 0;
2215}
2216
2217/**
2218 * proc_dointvec_jiffies - read a vector of integers as seconds
2219 * @table: the sysctl table
2220 * @write: %TRUE if this is a write to the sysctl file
2221 * @buffer: the user buffer
2222 * @lenp: the size of the user buffer
2223 * @ppos: file position
2224 *
2225 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2226 * values from/to the user buffer, treated as an ASCII string.
2227 * The values read are assumed to be in seconds, and are converted into
2228 * jiffies.
2229 *
2230 * Returns 0 on success.
2231 */
2232int proc_dointvec_jiffies(struct ctl_table *table, int write,
2233 void __user *buffer, size_t *lenp, loff_t *ppos)
2234{
2235 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2236 do_proc_dointvec_jiffies_conv,NULL);
2237}
2238
2239/**
2240 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2241 * @table: the sysctl table
2242 * @write: %TRUE if this is a write to the sysctl file
2243 * @buffer: the user buffer
2244 * @lenp: the size of the user buffer
2245 * @ppos: pointer to the file position
2246 *
2247 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2248 * values from/to the user buffer, treated as an ASCII string.
2249 * The values read are assumed to be in 1/USER_HZ seconds, and
2250 * are converted into jiffies.
2251 *
2252 * Returns 0 on success.
2253 */
2254int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2255 void __user *buffer, size_t *lenp, loff_t *ppos)
2256{
2257 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2258 do_proc_dointvec_userhz_jiffies_conv,NULL);
2259}
2260
2261/**
2262 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2263 * @table: the sysctl table
2264 * @write: %TRUE if this is a write to the sysctl file
2265 * @buffer: the user buffer
2266 * @lenp: the size of the user buffer
2267 * @ppos: file position
2268 * @ppos: the current position in the file
2269 *
2270 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2271 * values from/to the user buffer, treated as an ASCII string.
2272 * The values read are assumed to be in 1/1000 seconds, and
2273 * are converted into jiffies.
2274 *
2275 * Returns 0 on success.
2276 */
2277int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2278 void __user *buffer, size_t *lenp, loff_t *ppos)
2279{
2280 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2281 do_proc_dointvec_ms_jiffies_conv, NULL);
2282}
2283
2284static int proc_do_cad_pid(struct ctl_table *table, int write,
2285 void __user *buffer, size_t *lenp, loff_t *ppos)
2286{
2287 struct pid *new_pid;
2288 pid_t tmp;
2289 int r;
2290
2291 tmp = pid_vnr(cad_pid);
2292
2293 r = __do_proc_dointvec(&tmp, table, write, buffer,
2294 lenp, ppos, NULL, NULL);
2295 if (r || !write)
2296 return r;
2297
2298 new_pid = find_get_pid(tmp);
2299 if (!new_pid)
2300 return -ESRCH;
2301
2302 put_pid(xchg(&cad_pid, new_pid));
2303 return 0;
2304}
2305
2306/**
2307 * proc_do_large_bitmap - read/write from/to a large bitmap
2308 * @table: the sysctl table
2309 * @write: %TRUE if this is a write to the sysctl file
2310 * @buffer: the user buffer
2311 * @lenp: the size of the user buffer
2312 * @ppos: file position
2313 *
2314 * The bitmap is stored at table->data and the bitmap length (in bits)
2315 * in table->maxlen.
2316 *
2317 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2318 * large bitmaps may be represented in a compact manner. Writing into
2319 * the file will clear the bitmap then update it with the given input.
2320 *
2321 * Returns 0 on success.
2322 */
2323int proc_do_large_bitmap(struct ctl_table *table, int write,
2324 void __user *buffer, size_t *lenp, loff_t *ppos)
2325{
2326 int err = 0;
2327 bool first = 1;
2328 size_t left = *lenp;
2329 unsigned long bitmap_len = table->maxlen;
2330 unsigned long *bitmap = (unsigned long *) table->data;
2331 unsigned long *tmp_bitmap = NULL;
2332 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2333
2334 if (!bitmap_len || !left || (*ppos && !write)) {
2335 *lenp = 0;
2336 return 0;
2337 }
2338
2339 if (write) {
2340 unsigned long page = 0;
2341 char *kbuf;
2342
2343 if (left > PAGE_SIZE - 1)
2344 left = PAGE_SIZE - 1;
2345
2346 page = __get_free_page(GFP_TEMPORARY);
2347 kbuf = (char *) page;
2348 if (!kbuf)
2349 return -ENOMEM;
2350 if (copy_from_user(kbuf, buffer, left)) {
2351 free_page(page);
2352 return -EFAULT;
2353 }
2354 kbuf[left] = 0;
2355
2356 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2357 GFP_KERNEL);
2358 if (!tmp_bitmap) {
2359 free_page(page);
2360 return -ENOMEM;
2361 }
2362 proc_skip_char(&kbuf, &left, '\n');
2363 while (!err && left) {
2364 unsigned long val_a, val_b;
2365 bool neg;
2366
2367 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2368 sizeof(tr_a), &c);
2369 if (err)
2370 break;
2371 if (val_a >= bitmap_len || neg) {
2372 err = -EINVAL;
2373 break;
2374 }
2375
2376 val_b = val_a;
2377 if (left) {
2378 kbuf++;
2379 left--;
2380 }
2381
2382 if (c == '-') {
2383 err = proc_get_long(&kbuf, &left, &val_b,
2384 &neg, tr_b, sizeof(tr_b),
2385 &c);
2386 if (err)
2387 break;
2388 if (val_b >= bitmap_len || neg ||
2389 val_a > val_b) {
2390 err = -EINVAL;
2391 break;
2392 }
2393 if (left) {
2394 kbuf++;
2395 left--;
2396 }
2397 }
2398
2399 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2400 first = 0;
2401 proc_skip_char(&kbuf, &left, '\n');
2402 }
2403 free_page(page);
2404 } else {
2405 unsigned long bit_a, bit_b = 0;
2406
2407 while (left) {
2408 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2409 if (bit_a >= bitmap_len)
2410 break;
2411 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2412 bit_a + 1) - 1;
2413
2414 if (!first) {
2415 err = proc_put_char(&buffer, &left, ',');
2416 if (err)
2417 break;
2418 }
2419 err = proc_put_long(&buffer, &left, bit_a, false);
2420 if (err)
2421 break;
2422 if (bit_a != bit_b) {
2423 err = proc_put_char(&buffer, &left, '-');
2424 if (err)
2425 break;
2426 err = proc_put_long(&buffer, &left, bit_b, false);
2427 if (err)
2428 break;
2429 }
2430
2431 first = 0; bit_b++;
2432 }
2433 if (!err)
2434 err = proc_put_char(&buffer, &left, '\n');
2435 }
2436
2437 if (!err) {
2438 if (write) {
2439 if (*ppos)
2440 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2441 else
2442 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2443 }
2444 kfree(tmp_bitmap);
2445 *lenp -= left;
2446 *ppos += *lenp;
2447 return 0;
2448 } else {
2449 kfree(tmp_bitmap);
2450 return err;
2451 }
2452}
2453
2454#else /* CONFIG_PROC_SYSCTL */
2455
2456int proc_dostring(struct ctl_table *table, int write,
2457 void __user *buffer, size_t *lenp, loff_t *ppos)
2458{
2459 return -ENOSYS;
2460}
2461
2462int proc_dointvec(struct ctl_table *table, int write,
2463 void __user *buffer, size_t *lenp, loff_t *ppos)
2464{
2465 return -ENOSYS;
2466}
2467
2468int proc_dointvec_minmax(struct ctl_table *table, int write,
2469 void __user *buffer, size_t *lenp, loff_t *ppos)
2470{
2471 return -ENOSYS;
2472}
2473
2474int proc_dointvec_jiffies(struct ctl_table *table, int write,
2475 void __user *buffer, size_t *lenp, loff_t *ppos)
2476{
2477 return -ENOSYS;
2478}
2479
2480int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2481 void __user *buffer, size_t *lenp, loff_t *ppos)
2482{
2483 return -ENOSYS;
2484}
2485
2486int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2487 void __user *buffer, size_t *lenp, loff_t *ppos)
2488{
2489 return -ENOSYS;
2490}
2491
2492int proc_doulongvec_minmax(struct ctl_table *table, int write,
2493 void __user *buffer, size_t *lenp, loff_t *ppos)
2494{
2495 return -ENOSYS;
2496}
2497
2498int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2499 void __user *buffer,
2500 size_t *lenp, loff_t *ppos)
2501{
2502 return -ENOSYS;
2503}
2504
2505
2506#endif /* CONFIG_PROC_SYSCTL */
2507
2508/*
2509 * No sense putting this after each symbol definition, twice,
2510 * exception granted :-)
2511 */
2512EXPORT_SYMBOL(proc_dointvec);
2513EXPORT_SYMBOL(proc_dointvec_jiffies);
2514EXPORT_SYMBOL(proc_dointvec_minmax);
2515EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2516EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2517EXPORT_SYMBOL(proc_dostring);
2518EXPORT_SYMBOL(proc_doulongvec_minmax);
2519EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);