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