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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
69#include <asm/uaccess.h>
70#include <asm/processor.h>
71
72#ifdef CONFIG_X86
73#include <asm/nmi.h>
74#include <asm/stacktrace.h>
75#include <asm/io.h>
76#endif
77#ifdef CONFIG_SPARC
78#include <asm/setup.h>
79#endif
80#ifdef CONFIG_BSD_PROCESS_ACCT
81#include <linux/acct.h>
82#endif
83#ifdef CONFIG_RT_MUTEXES
84#include <linux/rtmutex.h>
85#endif
86#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
87#include <linux/lockdep.h>
88#endif
89#ifdef CONFIG_CHR_DEV_SG
90#include <scsi/sg.h>
91#endif
92
93#ifdef CONFIG_LOCKUP_DETECTOR
94#include <linux/nmi.h>
95#endif
96
97#if defined(CONFIG_SYSCTL)
98
99/* External variables not in a header file. */
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;
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 {
351 .procname = "sched_shares_window_ns",
352 .data = &sysctl_sched_shares_window,
353 .maxlen = sizeof(unsigned int),
354 .mode = 0644,
355 .proc_handler = proc_dointvec,
356 },
357#ifdef CONFIG_SCHEDSTATS
358 {
359 .procname = "sched_schedstats",
360 .data = NULL,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = sysctl_schedstats,
364 .extra1 = &zero,
365 .extra2 = &one,
366 },
367#endif /* CONFIG_SCHEDSTATS */
368#endif /* CONFIG_SMP */
369#ifdef CONFIG_NUMA_BALANCING
370 {
371 .procname = "numa_balancing_scan_delay_ms",
372 .data = &sysctl_numa_balancing_scan_delay,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
377 {
378 .procname = "numa_balancing_scan_period_min_ms",
379 .data = &sysctl_numa_balancing_scan_period_min,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384 {
385 .procname = "numa_balancing_scan_period_max_ms",
386 .data = &sysctl_numa_balancing_scan_period_max,
387 .maxlen = sizeof(unsigned int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec,
390 },
391 {
392 .procname = "numa_balancing_scan_size_mb",
393 .data = &sysctl_numa_balancing_scan_size,
394 .maxlen = sizeof(unsigned int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec_minmax,
397 .extra1 = &one,
398 },
399 {
400 .procname = "numa_balancing",
401 .data = NULL, /* filled in by handler */
402 .maxlen = sizeof(unsigned int),
403 .mode = 0644,
404 .proc_handler = sysctl_numa_balancing,
405 .extra1 = &zero,
406 .extra2 = &one,
407 },
408#endif /* CONFIG_NUMA_BALANCING */
409#endif /* CONFIG_SCHED_DEBUG */
410 {
411 .procname = "sched_rt_period_us",
412 .data = &sysctl_sched_rt_period,
413 .maxlen = sizeof(unsigned int),
414 .mode = 0644,
415 .proc_handler = sched_rt_handler,
416 },
417 {
418 .procname = "sched_rt_runtime_us",
419 .data = &sysctl_sched_rt_runtime,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = sched_rt_handler,
423 },
424 {
425 .procname = "sched_rr_timeslice_ms",
426 .data = &sched_rr_timeslice,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = sched_rr_handler,
430 },
431#ifdef CONFIG_SCHED_AUTOGROUP
432 {
433 .procname = "sched_autogroup_enabled",
434 .data = &sysctl_sched_autogroup_enabled,
435 .maxlen = sizeof(unsigned int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec_minmax,
438 .extra1 = &zero,
439 .extra2 = &one,
440 },
441#endif
442#ifdef CONFIG_CFS_BANDWIDTH
443 {
444 .procname = "sched_cfs_bandwidth_slice_us",
445 .data = &sysctl_sched_cfs_bandwidth_slice,
446 .maxlen = sizeof(unsigned int),
447 .mode = 0644,
448 .proc_handler = proc_dointvec_minmax,
449 .extra1 = &one,
450 },
451#endif
452#ifdef CONFIG_PROVE_LOCKING
453 {
454 .procname = "prove_locking",
455 .data = &prove_locking,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec,
459 },
460#endif
461#ifdef CONFIG_LOCK_STAT
462 {
463 .procname = "lock_stat",
464 .data = &lock_stat,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec,
468 },
469#endif
470 {
471 .procname = "panic",
472 .data = &panic_timeout,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec,
476 },
477#ifdef CONFIG_COREDUMP
478 {
479 .procname = "core_uses_pid",
480 .data = &core_uses_pid,
481 .maxlen = sizeof(int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec,
484 },
485 {
486 .procname = "core_pattern",
487 .data = core_pattern,
488 .maxlen = CORENAME_MAX_SIZE,
489 .mode = 0644,
490 .proc_handler = proc_dostring_coredump,
491 },
492 {
493 .procname = "core_pipe_limit",
494 .data = &core_pipe_limit,
495 .maxlen = sizeof(unsigned int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec,
498 },
499#endif
500#ifdef CONFIG_PROC_SYSCTL
501 {
502 .procname = "tainted",
503 .maxlen = sizeof(long),
504 .mode = 0644,
505 .proc_handler = proc_taint,
506 },
507 {
508 .procname = "sysctl_writes_strict",
509 .data = &sysctl_writes_strict,
510 .maxlen = sizeof(int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec_minmax,
513 .extra1 = &neg_one,
514 .extra2 = &one,
515 },
516#endif
517#ifdef CONFIG_LATENCYTOP
518 {
519 .procname = "latencytop",
520 .data = &latencytop_enabled,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = sysctl_latencytop,
524 },
525#endif
526#ifdef CONFIG_BLK_DEV_INITRD
527 {
528 .procname = "real-root-dev",
529 .data = &real_root_dev,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec,
533 },
534#endif
535 {
536 .procname = "print-fatal-signals",
537 .data = &print_fatal_signals,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542#ifdef CONFIG_SPARC
543 {
544 .procname = "reboot-cmd",
545 .data = reboot_command,
546 .maxlen = 256,
547 .mode = 0644,
548 .proc_handler = proc_dostring,
549 },
550 {
551 .procname = "stop-a",
552 .data = &stop_a_enabled,
553 .maxlen = sizeof (int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec,
556 },
557 {
558 .procname = "scons-poweroff",
559 .data = &scons_pwroff,
560 .maxlen = sizeof (int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec,
563 },
564#endif
565#ifdef CONFIG_SPARC64
566 {
567 .procname = "tsb-ratio",
568 .data = &sysctl_tsb_ratio,
569 .maxlen = sizeof (int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec,
572 },
573#endif
574#ifdef __hppa__
575 {
576 .procname = "soft-power",
577 .data = &pwrsw_enabled,
578 .maxlen = sizeof (int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582#endif
583#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
584 {
585 .procname = "unaligned-trap",
586 .data = &unaligned_enabled,
587 .maxlen = sizeof (int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec,
590 },
591#endif
592 {
593 .procname = "ctrl-alt-del",
594 .data = &C_A_D,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec,
598 },
599#ifdef CONFIG_FUNCTION_TRACER
600 {
601 .procname = "ftrace_enabled",
602 .data = &ftrace_enabled,
603 .maxlen = sizeof(int),
604 .mode = 0644,
605 .proc_handler = ftrace_enable_sysctl,
606 },
607#endif
608#ifdef CONFIG_STACK_TRACER
609 {
610 .procname = "stack_tracer_enabled",
611 .data = &stack_tracer_enabled,
612 .maxlen = sizeof(int),
613 .mode = 0644,
614 .proc_handler = stack_trace_sysctl,
615 },
616#endif
617#ifdef CONFIG_TRACING
618 {
619 .procname = "ftrace_dump_on_oops",
620 .data = &ftrace_dump_on_oops,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 .proc_handler = proc_dointvec,
624 },
625 {
626 .procname = "traceoff_on_warning",
627 .data = &__disable_trace_on_warning,
628 .maxlen = sizeof(__disable_trace_on_warning),
629 .mode = 0644,
630 .proc_handler = proc_dointvec,
631 },
632 {
633 .procname = "tracepoint_printk",
634 .data = &tracepoint_printk,
635 .maxlen = sizeof(tracepoint_printk),
636 .mode = 0644,
637 .proc_handler = proc_dointvec,
638 },
639#endif
640#ifdef CONFIG_KEXEC_CORE
641 {
642 .procname = "kexec_load_disabled",
643 .data = &kexec_load_disabled,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 /* only handle a transition from default "0" to "1" */
647 .proc_handler = proc_dointvec_minmax,
648 .extra1 = &one,
649 .extra2 = &one,
650 },
651#endif
652#ifdef CONFIG_MODULES
653 {
654 .procname = "modprobe",
655 .data = &modprobe_path,
656 .maxlen = KMOD_PATH_LEN,
657 .mode = 0644,
658 .proc_handler = proc_dostring,
659 },
660 {
661 .procname = "modules_disabled",
662 .data = &modules_disabled,
663 .maxlen = sizeof(int),
664 .mode = 0644,
665 /* only handle a transition from default "0" to "1" */
666 .proc_handler = proc_dointvec_minmax,
667 .extra1 = &one,
668 .extra2 = &one,
669 },
670#endif
671#ifdef CONFIG_UEVENT_HELPER
672 {
673 .procname = "hotplug",
674 .data = &uevent_helper,
675 .maxlen = UEVENT_HELPER_PATH_LEN,
676 .mode = 0644,
677 .proc_handler = proc_dostring,
678 },
679#endif
680#ifdef CONFIG_CHR_DEV_SG
681 {
682 .procname = "sg-big-buff",
683 .data = &sg_big_buff,
684 .maxlen = sizeof (int),
685 .mode = 0444,
686 .proc_handler = proc_dointvec,
687 },
688#endif
689#ifdef CONFIG_BSD_PROCESS_ACCT
690 {
691 .procname = "acct",
692 .data = &acct_parm,
693 .maxlen = 3*sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec,
696 },
697#endif
698#ifdef CONFIG_MAGIC_SYSRQ
699 {
700 .procname = "sysrq",
701 .data = &__sysrq_enabled,
702 .maxlen = sizeof (int),
703 .mode = 0644,
704 .proc_handler = sysrq_sysctl_handler,
705 },
706#endif
707#ifdef CONFIG_PROC_SYSCTL
708 {
709 .procname = "cad_pid",
710 .data = NULL,
711 .maxlen = sizeof (int),
712 .mode = 0600,
713 .proc_handler = proc_do_cad_pid,
714 },
715#endif
716 {
717 .procname = "threads-max",
718 .data = NULL,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = sysctl_max_threads,
722 },
723 {
724 .procname = "random",
725 .mode = 0555,
726 .child = random_table,
727 },
728 {
729 .procname = "usermodehelper",
730 .mode = 0555,
731 .child = usermodehelper_table,
732 },
733 {
734 .procname = "overflowuid",
735 .data = &overflowuid,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = proc_dointvec_minmax,
739 .extra1 = &minolduid,
740 .extra2 = &maxolduid,
741 },
742 {
743 .procname = "overflowgid",
744 .data = &overflowgid,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = proc_dointvec_minmax,
748 .extra1 = &minolduid,
749 .extra2 = &maxolduid,
750 },
751#ifdef CONFIG_S390
752#ifdef CONFIG_MATHEMU
753 {
754 .procname = "ieee_emulation_warnings",
755 .data = &sysctl_ieee_emulation_warnings,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec,
759 },
760#endif
761 {
762 .procname = "userprocess_debug",
763 .data = &show_unhandled_signals,
764 .maxlen = sizeof(int),
765 .mode = 0644,
766 .proc_handler = proc_dointvec,
767 },
768#endif
769 {
770 .procname = "pid_max",
771 .data = &pid_max,
772 .maxlen = sizeof (int),
773 .mode = 0644,
774 .proc_handler = proc_dointvec_minmax,
775 .extra1 = &pid_max_min,
776 .extra2 = &pid_max_max,
777 },
778 {
779 .procname = "panic_on_oops",
780 .data = &panic_on_oops,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec,
784 },
785#if defined CONFIG_PRINTK
786 {
787 .procname = "printk",
788 .data = &console_loglevel,
789 .maxlen = 4*sizeof(int),
790 .mode = 0644,
791 .proc_handler = proc_dointvec,
792 },
793 {
794 .procname = "printk_ratelimit",
795 .data = &printk_ratelimit_state.interval,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec_jiffies,
799 },
800 {
801 .procname = "printk_ratelimit_burst",
802 .data = &printk_ratelimit_state.burst,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec,
806 },
807 {
808 .procname = "printk_delay",
809 .data = &printk_delay_msec,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec_minmax,
813 .extra1 = &zero,
814 .extra2 = &ten_thousand,
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 = "kstack_depth_to_print",
987 .data = &kstack_depth_to_print,
988 .maxlen = sizeof(int),
989 .mode = 0644,
990 .proc_handler = proc_dointvec,
991 },
992 {
993 .procname = "io_delay_type",
994 .data = &io_delay_type,
995 .maxlen = sizeof(int),
996 .mode = 0644,
997 .proc_handler = proc_dointvec,
998 },
999#endif
1000#if defined(CONFIG_MMU)
1001 {
1002 .procname = "randomize_va_space",
1003 .data = &randomize_va_space,
1004 .maxlen = sizeof(int),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec,
1007 },
1008#endif
1009#if defined(CONFIG_S390) && defined(CONFIG_SMP)
1010 {
1011 .procname = "spin_retry",
1012 .data = &spin_retry,
1013 .maxlen = sizeof (int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec,
1016 },
1017#endif
1018#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1019 {
1020 .procname = "acpi_video_flags",
1021 .data = &acpi_realmode_flags,
1022 .maxlen = sizeof (unsigned long),
1023 .mode = 0644,
1024 .proc_handler = proc_doulongvec_minmax,
1025 },
1026#endif
1027#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1028 {
1029 .procname = "ignore-unaligned-usertrap",
1030 .data = &no_unaligned_warning,
1031 .maxlen = sizeof (int),
1032 .mode = 0644,
1033 .proc_handler = proc_dointvec,
1034 },
1035#endif
1036#ifdef CONFIG_IA64
1037 {
1038 .procname = "unaligned-dump-stack",
1039 .data = &unaligned_dump_stack,
1040 .maxlen = sizeof (int),
1041 .mode = 0644,
1042 .proc_handler = proc_dointvec,
1043 },
1044#endif
1045#ifdef CONFIG_DETECT_HUNG_TASK
1046 {
1047 .procname = "hung_task_panic",
1048 .data = &sysctl_hung_task_panic,
1049 .maxlen = sizeof(int),
1050 .mode = 0644,
1051 .proc_handler = proc_dointvec_minmax,
1052 .extra1 = &zero,
1053 .extra2 = &one,
1054 },
1055 {
1056 .procname = "hung_task_check_count",
1057 .data = &sysctl_hung_task_check_count,
1058 .maxlen = sizeof(int),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec_minmax,
1061 .extra1 = &zero,
1062 },
1063 {
1064 .procname = "hung_task_timeout_secs",
1065 .data = &sysctl_hung_task_timeout_secs,
1066 .maxlen = sizeof(unsigned long),
1067 .mode = 0644,
1068 .proc_handler = proc_dohung_task_timeout_secs,
1069 .extra2 = &hung_task_timeout_max,
1070 },
1071 {
1072 .procname = "hung_task_warnings",
1073 .data = &sysctl_hung_task_warnings,
1074 .maxlen = sizeof(int),
1075 .mode = 0644,
1076 .proc_handler = proc_dointvec_minmax,
1077 .extra1 = &neg_one,
1078 },
1079#endif
1080#ifdef CONFIG_COMPAT
1081 {
1082 .procname = "compat-log",
1083 .data = &compat_log,
1084 .maxlen = sizeof (int),
1085 .mode = 0644,
1086 .proc_handler = proc_dointvec,
1087 },
1088#endif
1089#ifdef CONFIG_RT_MUTEXES
1090 {
1091 .procname = "max_lock_depth",
1092 .data = &max_lock_depth,
1093 .maxlen = sizeof(int),
1094 .mode = 0644,
1095 .proc_handler = proc_dointvec,
1096 },
1097#endif
1098 {
1099 .procname = "poweroff_cmd",
1100 .data = &poweroff_cmd,
1101 .maxlen = POWEROFF_CMD_PATH_LEN,
1102 .mode = 0644,
1103 .proc_handler = proc_dostring,
1104 },
1105#ifdef CONFIG_KEYS
1106 {
1107 .procname = "keys",
1108 .mode = 0555,
1109 .child = key_sysctls,
1110 },
1111#endif
1112#ifdef CONFIG_PERF_EVENTS
1113 /*
1114 * User-space scripts rely on the existence of this file
1115 * as a feature check for perf_events being enabled.
1116 *
1117 * So it's an ABI, do not remove!
1118 */
1119 {
1120 .procname = "perf_event_paranoid",
1121 .data = &sysctl_perf_event_paranoid,
1122 .maxlen = sizeof(sysctl_perf_event_paranoid),
1123 .mode = 0644,
1124 .proc_handler = proc_dointvec,
1125 },
1126 {
1127 .procname = "perf_event_mlock_kb",
1128 .data = &sysctl_perf_event_mlock,
1129 .maxlen = sizeof(sysctl_perf_event_mlock),
1130 .mode = 0644,
1131 .proc_handler = proc_dointvec,
1132 },
1133 {
1134 .procname = "perf_event_max_sample_rate",
1135 .data = &sysctl_perf_event_sample_rate,
1136 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1137 .mode = 0644,
1138 .proc_handler = perf_proc_update_handler,
1139 .extra1 = &one,
1140 },
1141 {
1142 .procname = "perf_cpu_time_max_percent",
1143 .data = &sysctl_perf_cpu_time_max_percent,
1144 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1145 .mode = 0644,
1146 .proc_handler = perf_cpu_time_max_percent_handler,
1147 .extra1 = &zero,
1148 .extra2 = &one_hundred,
1149 },
1150 {
1151 .procname = "perf_event_max_stack",
1152 .data = &sysctl_perf_event_max_stack,
1153 .maxlen = sizeof(sysctl_perf_event_max_stack),
1154 .mode = 0644,
1155 .proc_handler = perf_event_max_stack_handler,
1156 .extra1 = &zero,
1157 .extra2 = &six_hundred_forty_kb,
1158 },
1159 {
1160 .procname = "perf_event_max_contexts_per_stack",
1161 .data = &sysctl_perf_event_max_contexts_per_stack,
1162 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1163 .mode = 0644,
1164 .proc_handler = perf_event_max_stack_handler,
1165 .extra1 = &zero,
1166 .extra2 = &one_thousand,
1167 },
1168#endif
1169#ifdef CONFIG_KMEMCHECK
1170 {
1171 .procname = "kmemcheck",
1172 .data = &kmemcheck_enabled,
1173 .maxlen = sizeof(int),
1174 .mode = 0644,
1175 .proc_handler = proc_dointvec,
1176 },
1177#endif
1178 {
1179 .procname = "panic_on_warn",
1180 .data = &panic_on_warn,
1181 .maxlen = sizeof(int),
1182 .mode = 0644,
1183 .proc_handler = proc_dointvec_minmax,
1184 .extra1 = &zero,
1185 .extra2 = &one,
1186 },
1187#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1188 {
1189 .procname = "timer_migration",
1190 .data = &sysctl_timer_migration,
1191 .maxlen = sizeof(unsigned int),
1192 .mode = 0644,
1193 .proc_handler = timer_migration_handler,
1194 },
1195#endif
1196#ifdef CONFIG_BPF_SYSCALL
1197 {
1198 .procname = "unprivileged_bpf_disabled",
1199 .data = &sysctl_unprivileged_bpf_disabled,
1200 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1201 .mode = 0644,
1202 /* only handle a transition from default "0" to "1" */
1203 .proc_handler = proc_dointvec_minmax,
1204 .extra1 = &one,
1205 .extra2 = &one,
1206 },
1207#endif
1208 { }
1209};
1210
1211static struct ctl_table vm_table[] = {
1212 {
1213 .procname = "overcommit_memory",
1214 .data = &sysctl_overcommit_memory,
1215 .maxlen = sizeof(sysctl_overcommit_memory),
1216 .mode = 0644,
1217 .proc_handler = proc_dointvec_minmax,
1218 .extra1 = &zero,
1219 .extra2 = &two,
1220 },
1221 {
1222 .procname = "panic_on_oom",
1223 .data = &sysctl_panic_on_oom,
1224 .maxlen = sizeof(sysctl_panic_on_oom),
1225 .mode = 0644,
1226 .proc_handler = proc_dointvec_minmax,
1227 .extra1 = &zero,
1228 .extra2 = &two,
1229 },
1230 {
1231 .procname = "oom_kill_allocating_task",
1232 .data = &sysctl_oom_kill_allocating_task,
1233 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1234 .mode = 0644,
1235 .proc_handler = proc_dointvec,
1236 },
1237 {
1238 .procname = "oom_dump_tasks",
1239 .data = &sysctl_oom_dump_tasks,
1240 .maxlen = sizeof(sysctl_oom_dump_tasks),
1241 .mode = 0644,
1242 .proc_handler = proc_dointvec,
1243 },
1244 {
1245 .procname = "overcommit_ratio",
1246 .data = &sysctl_overcommit_ratio,
1247 .maxlen = sizeof(sysctl_overcommit_ratio),
1248 .mode = 0644,
1249 .proc_handler = overcommit_ratio_handler,
1250 },
1251 {
1252 .procname = "overcommit_kbytes",
1253 .data = &sysctl_overcommit_kbytes,
1254 .maxlen = sizeof(sysctl_overcommit_kbytes),
1255 .mode = 0644,
1256 .proc_handler = overcommit_kbytes_handler,
1257 },
1258 {
1259 .procname = "page-cluster",
1260 .data = &page_cluster,
1261 .maxlen = sizeof(int),
1262 .mode = 0644,
1263 .proc_handler = proc_dointvec_minmax,
1264 .extra1 = &zero,
1265 },
1266 {
1267 .procname = "dirty_background_ratio",
1268 .data = &dirty_background_ratio,
1269 .maxlen = sizeof(dirty_background_ratio),
1270 .mode = 0644,
1271 .proc_handler = dirty_background_ratio_handler,
1272 .extra1 = &zero,
1273 .extra2 = &one_hundred,
1274 },
1275 {
1276 .procname = "dirty_background_bytes",
1277 .data = &dirty_background_bytes,
1278 .maxlen = sizeof(dirty_background_bytes),
1279 .mode = 0644,
1280 .proc_handler = dirty_background_bytes_handler,
1281 .extra1 = &one_ul,
1282 },
1283 {
1284 .procname = "dirty_ratio",
1285 .data = &vm_dirty_ratio,
1286 .maxlen = sizeof(vm_dirty_ratio),
1287 .mode = 0644,
1288 .proc_handler = dirty_ratio_handler,
1289 .extra1 = &zero,
1290 .extra2 = &one_hundred,
1291 },
1292 {
1293 .procname = "dirty_bytes",
1294 .data = &vm_dirty_bytes,
1295 .maxlen = sizeof(vm_dirty_bytes),
1296 .mode = 0644,
1297 .proc_handler = dirty_bytes_handler,
1298 .extra1 = &dirty_bytes_min,
1299 },
1300 {
1301 .procname = "dirty_writeback_centisecs",
1302 .data = &dirty_writeback_interval,
1303 .maxlen = sizeof(dirty_writeback_interval),
1304 .mode = 0644,
1305 .proc_handler = dirty_writeback_centisecs_handler,
1306 },
1307 {
1308 .procname = "dirty_expire_centisecs",
1309 .data = &dirty_expire_interval,
1310 .maxlen = sizeof(dirty_expire_interval),
1311 .mode = 0644,
1312 .proc_handler = proc_dointvec_minmax,
1313 .extra1 = &zero,
1314 },
1315 {
1316 .procname = "dirtytime_expire_seconds",
1317 .data = &dirtytime_expire_interval,
1318 .maxlen = sizeof(dirty_expire_interval),
1319 .mode = 0644,
1320 .proc_handler = dirtytime_interval_handler,
1321 .extra1 = &zero,
1322 },
1323 {
1324 .procname = "nr_pdflush_threads",
1325 .mode = 0444 /* read-only */,
1326 .proc_handler = pdflush_proc_obsolete,
1327 },
1328 {
1329 .procname = "swappiness",
1330 .data = &vm_swappiness,
1331 .maxlen = sizeof(vm_swappiness),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec_minmax,
1334 .extra1 = &zero,
1335 .extra2 = &one_hundred,
1336 },
1337#ifdef CONFIG_HUGETLB_PAGE
1338 {
1339 .procname = "nr_hugepages",
1340 .data = NULL,
1341 .maxlen = sizeof(unsigned long),
1342 .mode = 0644,
1343 .proc_handler = hugetlb_sysctl_handler,
1344 },
1345#ifdef CONFIG_NUMA
1346 {
1347 .procname = "nr_hugepages_mempolicy",
1348 .data = NULL,
1349 .maxlen = sizeof(unsigned long),
1350 .mode = 0644,
1351 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1352 },
1353#endif
1354 {
1355 .procname = "hugetlb_shm_group",
1356 .data = &sysctl_hugetlb_shm_group,
1357 .maxlen = sizeof(gid_t),
1358 .mode = 0644,
1359 .proc_handler = proc_dointvec,
1360 },
1361 {
1362 .procname = "hugepages_treat_as_movable",
1363 .data = &hugepages_treat_as_movable,
1364 .maxlen = sizeof(int),
1365 .mode = 0644,
1366 .proc_handler = proc_dointvec,
1367 },
1368 {
1369 .procname = "nr_overcommit_hugepages",
1370 .data = NULL,
1371 .maxlen = sizeof(unsigned long),
1372 .mode = 0644,
1373 .proc_handler = hugetlb_overcommit_handler,
1374 },
1375#endif
1376 {
1377 .procname = "lowmem_reserve_ratio",
1378 .data = &sysctl_lowmem_reserve_ratio,
1379 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1380 .mode = 0644,
1381 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1382 },
1383 {
1384 .procname = "drop_caches",
1385 .data = &sysctl_drop_caches,
1386 .maxlen = sizeof(int),
1387 .mode = 0644,
1388 .proc_handler = drop_caches_sysctl_handler,
1389 .extra1 = &one,
1390 .extra2 = &four,
1391 },
1392#ifdef CONFIG_COMPACTION
1393 {
1394 .procname = "compact_memory",
1395 .data = &sysctl_compact_memory,
1396 .maxlen = sizeof(int),
1397 .mode = 0200,
1398 .proc_handler = sysctl_compaction_handler,
1399 },
1400 {
1401 .procname = "extfrag_threshold",
1402 .data = &sysctl_extfrag_threshold,
1403 .maxlen = sizeof(int),
1404 .mode = 0644,
1405 .proc_handler = sysctl_extfrag_handler,
1406 .extra1 = &min_extfrag_threshold,
1407 .extra2 = &max_extfrag_threshold,
1408 },
1409 {
1410 .procname = "compact_unevictable_allowed",
1411 .data = &sysctl_compact_unevictable_allowed,
1412 .maxlen = sizeof(int),
1413 .mode = 0644,
1414 .proc_handler = proc_dointvec,
1415 .extra1 = &zero,
1416 .extra2 = &one,
1417 },
1418
1419#endif /* CONFIG_COMPACTION */
1420 {
1421 .procname = "min_free_kbytes",
1422 .data = &min_free_kbytes,
1423 .maxlen = sizeof(min_free_kbytes),
1424 .mode = 0644,
1425 .proc_handler = min_free_kbytes_sysctl_handler,
1426 .extra1 = &zero,
1427 },
1428 {
1429 .procname = "watermark_scale_factor",
1430 .data = &watermark_scale_factor,
1431 .maxlen = sizeof(watermark_scale_factor),
1432 .mode = 0644,
1433 .proc_handler = watermark_scale_factor_sysctl_handler,
1434 .extra1 = &one,
1435 .extra2 = &one_thousand,
1436 },
1437 {
1438 .procname = "percpu_pagelist_fraction",
1439 .data = &percpu_pagelist_fraction,
1440 .maxlen = sizeof(percpu_pagelist_fraction),
1441 .mode = 0644,
1442 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1443 .extra1 = &zero,
1444 },
1445#ifdef CONFIG_MMU
1446 {
1447 .procname = "max_map_count",
1448 .data = &sysctl_max_map_count,
1449 .maxlen = sizeof(sysctl_max_map_count),
1450 .mode = 0644,
1451 .proc_handler = proc_dointvec_minmax,
1452 .extra1 = &zero,
1453 },
1454#else
1455 {
1456 .procname = "nr_trim_pages",
1457 .data = &sysctl_nr_trim_pages,
1458 .maxlen = sizeof(sysctl_nr_trim_pages),
1459 .mode = 0644,
1460 .proc_handler = proc_dointvec_minmax,
1461 .extra1 = &zero,
1462 },
1463#endif
1464 {
1465 .procname = "laptop_mode",
1466 .data = &laptop_mode,
1467 .maxlen = sizeof(laptop_mode),
1468 .mode = 0644,
1469 .proc_handler = proc_dointvec_jiffies,
1470 },
1471 {
1472 .procname = "block_dump",
1473 .data = &block_dump,
1474 .maxlen = sizeof(block_dump),
1475 .mode = 0644,
1476 .proc_handler = proc_dointvec,
1477 .extra1 = &zero,
1478 },
1479 {
1480 .procname = "vfs_cache_pressure",
1481 .data = &sysctl_vfs_cache_pressure,
1482 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1483 .mode = 0644,
1484 .proc_handler = proc_dointvec,
1485 .extra1 = &zero,
1486 },
1487#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1488 {
1489 .procname = "legacy_va_layout",
1490 .data = &sysctl_legacy_va_layout,
1491 .maxlen = sizeof(sysctl_legacy_va_layout),
1492 .mode = 0644,
1493 .proc_handler = proc_dointvec,
1494 .extra1 = &zero,
1495 },
1496#endif
1497#ifdef CONFIG_NUMA
1498 {
1499 .procname = "zone_reclaim_mode",
1500 .data = &zone_reclaim_mode,
1501 .maxlen = sizeof(zone_reclaim_mode),
1502 .mode = 0644,
1503 .proc_handler = proc_dointvec,
1504 .extra1 = &zero,
1505 },
1506 {
1507 .procname = "min_unmapped_ratio",
1508 .data = &sysctl_min_unmapped_ratio,
1509 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1510 .mode = 0644,
1511 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1512 .extra1 = &zero,
1513 .extra2 = &one_hundred,
1514 },
1515 {
1516 .procname = "min_slab_ratio",
1517 .data = &sysctl_min_slab_ratio,
1518 .maxlen = sizeof(sysctl_min_slab_ratio),
1519 .mode = 0644,
1520 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1521 .extra1 = &zero,
1522 .extra2 = &one_hundred,
1523 },
1524#endif
1525#ifdef CONFIG_SMP
1526 {
1527 .procname = "stat_interval",
1528 .data = &sysctl_stat_interval,
1529 .maxlen = sizeof(sysctl_stat_interval),
1530 .mode = 0644,
1531 .proc_handler = proc_dointvec_jiffies,
1532 },
1533#endif
1534#ifdef CONFIG_MMU
1535 {
1536 .procname = "mmap_min_addr",
1537 .data = &dac_mmap_min_addr,
1538 .maxlen = sizeof(unsigned long),
1539 .mode = 0644,
1540 .proc_handler = mmap_min_addr_handler,
1541 },
1542#endif
1543#ifdef CONFIG_NUMA
1544 {
1545 .procname = "numa_zonelist_order",
1546 .data = &numa_zonelist_order,
1547 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1548 .mode = 0644,
1549 .proc_handler = numa_zonelist_order_handler,
1550 },
1551#endif
1552#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1553 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1554 {
1555 .procname = "vdso_enabled",
1556#ifdef CONFIG_X86_32
1557 .data = &vdso32_enabled,
1558 .maxlen = sizeof(vdso32_enabled),
1559#else
1560 .data = &vdso_enabled,
1561 .maxlen = sizeof(vdso_enabled),
1562#endif
1563 .mode = 0644,
1564 .proc_handler = proc_dointvec,
1565 .extra1 = &zero,
1566 },
1567#endif
1568#ifdef CONFIG_HIGHMEM
1569 {
1570 .procname = "highmem_is_dirtyable",
1571 .data = &vm_highmem_is_dirtyable,
1572 .maxlen = sizeof(vm_highmem_is_dirtyable),
1573 .mode = 0644,
1574 .proc_handler = proc_dointvec_minmax,
1575 .extra1 = &zero,
1576 .extra2 = &one,
1577 },
1578#endif
1579#ifdef CONFIG_MEMORY_FAILURE
1580 {
1581 .procname = "memory_failure_early_kill",
1582 .data = &sysctl_memory_failure_early_kill,
1583 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1584 .mode = 0644,
1585 .proc_handler = proc_dointvec_minmax,
1586 .extra1 = &zero,
1587 .extra2 = &one,
1588 },
1589 {
1590 .procname = "memory_failure_recovery",
1591 .data = &sysctl_memory_failure_recovery,
1592 .maxlen = sizeof(sysctl_memory_failure_recovery),
1593 .mode = 0644,
1594 .proc_handler = proc_dointvec_minmax,
1595 .extra1 = &zero,
1596 .extra2 = &one,
1597 },
1598#endif
1599 {
1600 .procname = "user_reserve_kbytes",
1601 .data = &sysctl_user_reserve_kbytes,
1602 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1603 .mode = 0644,
1604 .proc_handler = proc_doulongvec_minmax,
1605 },
1606 {
1607 .procname = "admin_reserve_kbytes",
1608 .data = &sysctl_admin_reserve_kbytes,
1609 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1610 .mode = 0644,
1611 .proc_handler = proc_doulongvec_minmax,
1612 },
1613#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1614 {
1615 .procname = "mmap_rnd_bits",
1616 .data = &mmap_rnd_bits,
1617 .maxlen = sizeof(mmap_rnd_bits),
1618 .mode = 0600,
1619 .proc_handler = proc_dointvec_minmax,
1620 .extra1 = (void *)&mmap_rnd_bits_min,
1621 .extra2 = (void *)&mmap_rnd_bits_max,
1622 },
1623#endif
1624#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1625 {
1626 .procname = "mmap_rnd_compat_bits",
1627 .data = &mmap_rnd_compat_bits,
1628 .maxlen = sizeof(mmap_rnd_compat_bits),
1629 .mode = 0600,
1630 .proc_handler = proc_dointvec_minmax,
1631 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1632 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1633 },
1634#endif
1635 { }
1636};
1637
1638static struct ctl_table fs_table[] = {
1639 {
1640 .procname = "inode-nr",
1641 .data = &inodes_stat,
1642 .maxlen = 2*sizeof(long),
1643 .mode = 0444,
1644 .proc_handler = proc_nr_inodes,
1645 },
1646 {
1647 .procname = "inode-state",
1648 .data = &inodes_stat,
1649 .maxlen = 7*sizeof(long),
1650 .mode = 0444,
1651 .proc_handler = proc_nr_inodes,
1652 },
1653 {
1654 .procname = "file-nr",
1655 .data = &files_stat,
1656 .maxlen = sizeof(files_stat),
1657 .mode = 0444,
1658 .proc_handler = proc_nr_files,
1659 },
1660 {
1661 .procname = "file-max",
1662 .data = &files_stat.max_files,
1663 .maxlen = sizeof(files_stat.max_files),
1664 .mode = 0644,
1665 .proc_handler = proc_doulongvec_minmax,
1666 },
1667 {
1668 .procname = "nr_open",
1669 .data = &sysctl_nr_open,
1670 .maxlen = sizeof(int),
1671 .mode = 0644,
1672 .proc_handler = proc_dointvec_minmax,
1673 .extra1 = &sysctl_nr_open_min,
1674 .extra2 = &sysctl_nr_open_max,
1675 },
1676 {
1677 .procname = "dentry-state",
1678 .data = &dentry_stat,
1679 .maxlen = 6*sizeof(long),
1680 .mode = 0444,
1681 .proc_handler = proc_nr_dentry,
1682 },
1683 {
1684 .procname = "overflowuid",
1685 .data = &fs_overflowuid,
1686 .maxlen = sizeof(int),
1687 .mode = 0644,
1688 .proc_handler = proc_dointvec_minmax,
1689 .extra1 = &minolduid,
1690 .extra2 = &maxolduid,
1691 },
1692 {
1693 .procname = "overflowgid",
1694 .data = &fs_overflowgid,
1695 .maxlen = sizeof(int),
1696 .mode = 0644,
1697 .proc_handler = proc_dointvec_minmax,
1698 .extra1 = &minolduid,
1699 .extra2 = &maxolduid,
1700 },
1701#ifdef CONFIG_FILE_LOCKING
1702 {
1703 .procname = "leases-enable",
1704 .data = &leases_enable,
1705 .maxlen = sizeof(int),
1706 .mode = 0644,
1707 .proc_handler = proc_dointvec,
1708 },
1709#endif
1710#ifdef CONFIG_DNOTIFY
1711 {
1712 .procname = "dir-notify-enable",
1713 .data = &dir_notify_enable,
1714 .maxlen = sizeof(int),
1715 .mode = 0644,
1716 .proc_handler = proc_dointvec,
1717 },
1718#endif
1719#ifdef CONFIG_MMU
1720#ifdef CONFIG_FILE_LOCKING
1721 {
1722 .procname = "lease-break-time",
1723 .data = &lease_break_time,
1724 .maxlen = sizeof(int),
1725 .mode = 0644,
1726 .proc_handler = proc_dointvec,
1727 },
1728#endif
1729#ifdef CONFIG_AIO
1730 {
1731 .procname = "aio-nr",
1732 .data = &aio_nr,
1733 .maxlen = sizeof(aio_nr),
1734 .mode = 0444,
1735 .proc_handler = proc_doulongvec_minmax,
1736 },
1737 {
1738 .procname = "aio-max-nr",
1739 .data = &aio_max_nr,
1740 .maxlen = sizeof(aio_max_nr),
1741 .mode = 0644,
1742 .proc_handler = proc_doulongvec_minmax,
1743 },
1744#endif /* CONFIG_AIO */
1745#ifdef CONFIG_INOTIFY_USER
1746 {
1747 .procname = "inotify",
1748 .mode = 0555,
1749 .child = inotify_table,
1750 },
1751#endif
1752#ifdef CONFIG_EPOLL
1753 {
1754 .procname = "epoll",
1755 .mode = 0555,
1756 .child = epoll_table,
1757 },
1758#endif
1759#endif
1760 {
1761 .procname = "protected_symlinks",
1762 .data = &sysctl_protected_symlinks,
1763 .maxlen = sizeof(int),
1764 .mode = 0600,
1765 .proc_handler = proc_dointvec_minmax,
1766 .extra1 = &zero,
1767 .extra2 = &one,
1768 },
1769 {
1770 .procname = "protected_hardlinks",
1771 .data = &sysctl_protected_hardlinks,
1772 .maxlen = sizeof(int),
1773 .mode = 0600,
1774 .proc_handler = proc_dointvec_minmax,
1775 .extra1 = &zero,
1776 .extra2 = &one,
1777 },
1778 {
1779 .procname = "suid_dumpable",
1780 .data = &suid_dumpable,
1781 .maxlen = sizeof(int),
1782 .mode = 0644,
1783 .proc_handler = proc_dointvec_minmax_coredump,
1784 .extra1 = &zero,
1785 .extra2 = &two,
1786 },
1787#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1788 {
1789 .procname = "binfmt_misc",
1790 .mode = 0555,
1791 .child = sysctl_mount_point,
1792 },
1793#endif
1794 {
1795 .procname = "pipe-max-size",
1796 .data = &pipe_max_size,
1797 .maxlen = sizeof(int),
1798 .mode = 0644,
1799 .proc_handler = &pipe_proc_fn,
1800 .extra1 = &pipe_min_size,
1801 },
1802 {
1803 .procname = "pipe-user-pages-hard",
1804 .data = &pipe_user_pages_hard,
1805 .maxlen = sizeof(pipe_user_pages_hard),
1806 .mode = 0644,
1807 .proc_handler = proc_doulongvec_minmax,
1808 },
1809 {
1810 .procname = "pipe-user-pages-soft",
1811 .data = &pipe_user_pages_soft,
1812 .maxlen = sizeof(pipe_user_pages_soft),
1813 .mode = 0644,
1814 .proc_handler = proc_doulongvec_minmax,
1815 },
1816 { }
1817};
1818
1819static struct ctl_table debug_table[] = {
1820#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1821 {
1822 .procname = "exception-trace",
1823 .data = &show_unhandled_signals,
1824 .maxlen = sizeof(int),
1825 .mode = 0644,
1826 .proc_handler = proc_dointvec
1827 },
1828#endif
1829#if defined(CONFIG_OPTPROBES)
1830 {
1831 .procname = "kprobes-optimization",
1832 .data = &sysctl_kprobes_optimization,
1833 .maxlen = sizeof(int),
1834 .mode = 0644,
1835 .proc_handler = proc_kprobes_optimization_handler,
1836 .extra1 = &zero,
1837 .extra2 = &one,
1838 },
1839#endif
1840 { }
1841};
1842
1843static struct ctl_table dev_table[] = {
1844 { }
1845};
1846
1847int __init sysctl_init(void)
1848{
1849 struct ctl_table_header *hdr;
1850
1851 hdr = register_sysctl_table(sysctl_base_table);
1852 kmemleak_not_leak(hdr);
1853 return 0;
1854}
1855
1856#endif /* CONFIG_SYSCTL */
1857
1858/*
1859 * /proc/sys support
1860 */
1861
1862#ifdef CONFIG_PROC_SYSCTL
1863
1864static int _proc_do_string(char *data, int maxlen, int write,
1865 char __user *buffer,
1866 size_t *lenp, loff_t *ppos)
1867{
1868 size_t len;
1869 char __user *p;
1870 char c;
1871
1872 if (!data || !maxlen || !*lenp) {
1873 *lenp = 0;
1874 return 0;
1875 }
1876
1877 if (write) {
1878 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1879 /* Only continue writes not past the end of buffer. */
1880 len = strlen(data);
1881 if (len > maxlen - 1)
1882 len = maxlen - 1;
1883
1884 if (*ppos > len)
1885 return 0;
1886 len = *ppos;
1887 } else {
1888 /* Start writing from beginning of buffer. */
1889 len = 0;
1890 }
1891
1892 *ppos += *lenp;
1893 p = buffer;
1894 while ((p - buffer) < *lenp && len < maxlen - 1) {
1895 if (get_user(c, p++))
1896 return -EFAULT;
1897 if (c == 0 || c == '\n')
1898 break;
1899 data[len++] = c;
1900 }
1901 data[len] = 0;
1902 } else {
1903 len = strlen(data);
1904 if (len > maxlen)
1905 len = maxlen;
1906
1907 if (*ppos > len) {
1908 *lenp = 0;
1909 return 0;
1910 }
1911
1912 data += *ppos;
1913 len -= *ppos;
1914
1915 if (len > *lenp)
1916 len = *lenp;
1917 if (len)
1918 if (copy_to_user(buffer, data, len))
1919 return -EFAULT;
1920 if (len < *lenp) {
1921 if (put_user('\n', buffer + len))
1922 return -EFAULT;
1923 len++;
1924 }
1925 *lenp = len;
1926 *ppos += len;
1927 }
1928 return 0;
1929}
1930
1931static void warn_sysctl_write(struct ctl_table *table)
1932{
1933 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1934 "This will not be supported in the future. To silence this\n"
1935 "warning, set kernel.sysctl_writes_strict = -1\n",
1936 current->comm, table->procname);
1937}
1938
1939/**
1940 * proc_dostring - read a string sysctl
1941 * @table: the sysctl table
1942 * @write: %TRUE if this is a write to the sysctl file
1943 * @buffer: the user buffer
1944 * @lenp: the size of the user buffer
1945 * @ppos: file position
1946 *
1947 * Reads/writes a string from/to the user buffer. If the kernel
1948 * buffer provided is not large enough to hold the string, the
1949 * string is truncated. The copied string is %NULL-terminated.
1950 * If the string is being read by the user process, it is copied
1951 * and a newline '\n' is added. It is truncated if the buffer is
1952 * not large enough.
1953 *
1954 * Returns 0 on success.
1955 */
1956int proc_dostring(struct ctl_table *table, int write,
1957 void __user *buffer, size_t *lenp, loff_t *ppos)
1958{
1959 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1960 warn_sysctl_write(table);
1961
1962 return _proc_do_string((char *)(table->data), table->maxlen, write,
1963 (char __user *)buffer, lenp, ppos);
1964}
1965
1966static size_t proc_skip_spaces(char **buf)
1967{
1968 size_t ret;
1969 char *tmp = skip_spaces(*buf);
1970 ret = tmp - *buf;
1971 *buf = tmp;
1972 return ret;
1973}
1974
1975static void proc_skip_char(char **buf, size_t *size, const char v)
1976{
1977 while (*size) {
1978 if (**buf != v)
1979 break;
1980 (*size)--;
1981 (*buf)++;
1982 }
1983}
1984
1985#define TMPBUFLEN 22
1986/**
1987 * proc_get_long - reads an ASCII formatted integer from a user buffer
1988 *
1989 * @buf: a kernel buffer
1990 * @size: size of the kernel buffer
1991 * @val: this is where the number will be stored
1992 * @neg: set to %TRUE if number is negative
1993 * @perm_tr: a vector which contains the allowed trailers
1994 * @perm_tr_len: size of the perm_tr vector
1995 * @tr: pointer to store the trailer character
1996 *
1997 * In case of success %0 is returned and @buf and @size are updated with
1998 * the amount of bytes read. If @tr is non-NULL and a trailing
1999 * character exists (size is non-zero after returning from this
2000 * function), @tr is updated with the trailing character.
2001 */
2002static int proc_get_long(char **buf, size_t *size,
2003 unsigned long *val, bool *neg,
2004 const char *perm_tr, unsigned perm_tr_len, char *tr)
2005{
2006 int len;
2007 char *p, tmp[TMPBUFLEN];
2008
2009 if (!*size)
2010 return -EINVAL;
2011
2012 len = *size;
2013 if (len > TMPBUFLEN - 1)
2014 len = TMPBUFLEN - 1;
2015
2016 memcpy(tmp, *buf, len);
2017
2018 tmp[len] = 0;
2019 p = tmp;
2020 if (*p == '-' && *size > 1) {
2021 *neg = true;
2022 p++;
2023 } else
2024 *neg = false;
2025 if (!isdigit(*p))
2026 return -EINVAL;
2027
2028 *val = simple_strtoul(p, &p, 0);
2029
2030 len = p - tmp;
2031
2032 /* We don't know if the next char is whitespace thus we may accept
2033 * invalid integers (e.g. 1234...a) or two integers instead of one
2034 * (e.g. 123...1). So lets not allow such large numbers. */
2035 if (len == TMPBUFLEN - 1)
2036 return -EINVAL;
2037
2038 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2039 return -EINVAL;
2040
2041 if (tr && (len < *size))
2042 *tr = *p;
2043
2044 *buf += len;
2045 *size -= len;
2046
2047 return 0;
2048}
2049
2050/**
2051 * proc_put_long - converts an integer to a decimal ASCII formatted string
2052 *
2053 * @buf: the user buffer
2054 * @size: the size of the user buffer
2055 * @val: the integer to be converted
2056 * @neg: sign of the number, %TRUE for negative
2057 *
2058 * In case of success %0 is returned and @buf and @size are updated with
2059 * the amount of bytes written.
2060 */
2061static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2062 bool neg)
2063{
2064 int len;
2065 char tmp[TMPBUFLEN], *p = tmp;
2066
2067 sprintf(p, "%s%lu", neg ? "-" : "", val);
2068 len = strlen(tmp);
2069 if (len > *size)
2070 len = *size;
2071 if (copy_to_user(*buf, tmp, len))
2072 return -EFAULT;
2073 *size -= len;
2074 *buf += len;
2075 return 0;
2076}
2077#undef TMPBUFLEN
2078
2079static int proc_put_char(void __user **buf, size_t *size, char c)
2080{
2081 if (*size) {
2082 char __user **buffer = (char __user **)buf;
2083 if (put_user(c, *buffer))
2084 return -EFAULT;
2085 (*size)--, (*buffer)++;
2086 *buf = *buffer;
2087 }
2088 return 0;
2089}
2090
2091static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2092 int *valp,
2093 int write, void *data)
2094{
2095 if (write) {
2096 if (*negp) {
2097 if (*lvalp > (unsigned long) INT_MAX + 1)
2098 return -EINVAL;
2099 *valp = -*lvalp;
2100 } else {
2101 if (*lvalp > (unsigned long) INT_MAX)
2102 return -EINVAL;
2103 *valp = *lvalp;
2104 }
2105 } else {
2106 int val = *valp;
2107 if (val < 0) {
2108 *negp = true;
2109 *lvalp = -(unsigned long)val;
2110 } else {
2111 *negp = false;
2112 *lvalp = (unsigned long)val;
2113 }
2114 }
2115 return 0;
2116}
2117
2118static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2119
2120static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2121 int write, void __user *buffer,
2122 size_t *lenp, loff_t *ppos,
2123 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2124 int write, void *data),
2125 void *data)
2126{
2127 int *i, vleft, first = 1, err = 0;
2128 size_t left;
2129 char *kbuf = NULL, *p;
2130
2131 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2132 *lenp = 0;
2133 return 0;
2134 }
2135
2136 i = (int *) tbl_data;
2137 vleft = table->maxlen / sizeof(*i);
2138 left = *lenp;
2139
2140 if (!conv)
2141 conv = do_proc_dointvec_conv;
2142
2143 if (write) {
2144 if (*ppos) {
2145 switch (sysctl_writes_strict) {
2146 case SYSCTL_WRITES_STRICT:
2147 goto out;
2148 case SYSCTL_WRITES_WARN:
2149 warn_sysctl_write(table);
2150 break;
2151 default:
2152 break;
2153 }
2154 }
2155
2156 if (left > PAGE_SIZE - 1)
2157 left = PAGE_SIZE - 1;
2158 p = kbuf = memdup_user_nul(buffer, left);
2159 if (IS_ERR(kbuf))
2160 return PTR_ERR(kbuf);
2161 }
2162
2163 for (; left && vleft--; i++, first=0) {
2164 unsigned long lval;
2165 bool neg;
2166
2167 if (write) {
2168 left -= proc_skip_spaces(&p);
2169
2170 if (!left)
2171 break;
2172 err = proc_get_long(&p, &left, &lval, &neg,
2173 proc_wspace_sep,
2174 sizeof(proc_wspace_sep), NULL);
2175 if (err)
2176 break;
2177 if (conv(&neg, &lval, i, 1, data)) {
2178 err = -EINVAL;
2179 break;
2180 }
2181 } else {
2182 if (conv(&neg, &lval, i, 0, data)) {
2183 err = -EINVAL;
2184 break;
2185 }
2186 if (!first)
2187 err = proc_put_char(&buffer, &left, '\t');
2188 if (err)
2189 break;
2190 err = proc_put_long(&buffer, &left, lval, neg);
2191 if (err)
2192 break;
2193 }
2194 }
2195
2196 if (!write && !first && left && !err)
2197 err = proc_put_char(&buffer, &left, '\n');
2198 if (write && !err && left)
2199 left -= proc_skip_spaces(&p);
2200 if (write) {
2201 kfree(kbuf);
2202 if (first)
2203 return err ? : -EINVAL;
2204 }
2205 *lenp -= left;
2206out:
2207 *ppos += *lenp;
2208 return err;
2209}
2210
2211static int do_proc_dointvec(struct ctl_table *table, int write,
2212 void __user *buffer, size_t *lenp, loff_t *ppos,
2213 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2214 int write, void *data),
2215 void *data)
2216{
2217 return __do_proc_dointvec(table->data, table, write,
2218 buffer, lenp, ppos, conv, data);
2219}
2220
2221/**
2222 * proc_dointvec - read a vector of integers
2223 * @table: the sysctl table
2224 * @write: %TRUE if this is a write to the sysctl file
2225 * @buffer: the user buffer
2226 * @lenp: the size of the user buffer
2227 * @ppos: file position
2228 *
2229 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2230 * values from/to the user buffer, treated as an ASCII string.
2231 *
2232 * Returns 0 on success.
2233 */
2234int proc_dointvec(struct ctl_table *table, int write,
2235 void __user *buffer, size_t *lenp, loff_t *ppos)
2236{
2237 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2238 NULL,NULL);
2239}
2240
2241/*
2242 * Taint values can only be increased
2243 * This means we can safely use a temporary.
2244 */
2245static int proc_taint(struct ctl_table *table, int write,
2246 void __user *buffer, size_t *lenp, loff_t *ppos)
2247{
2248 struct ctl_table t;
2249 unsigned long tmptaint = get_taint();
2250 int err;
2251
2252 if (write && !capable(CAP_SYS_ADMIN))
2253 return -EPERM;
2254
2255 t = *table;
2256 t.data = &tmptaint;
2257 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2258 if (err < 0)
2259 return err;
2260
2261 if (write) {
2262 /*
2263 * Poor man's atomic or. Not worth adding a primitive
2264 * to everyone's atomic.h for this
2265 */
2266 int i;
2267 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2268 if ((tmptaint >> i) & 1)
2269 add_taint(i, LOCKDEP_STILL_OK);
2270 }
2271 }
2272
2273 return err;
2274}
2275
2276#ifdef CONFIG_PRINTK
2277static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2278 void __user *buffer, size_t *lenp, loff_t *ppos)
2279{
2280 if (write && !capable(CAP_SYS_ADMIN))
2281 return -EPERM;
2282
2283 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2284}
2285#endif
2286
2287struct do_proc_dointvec_minmax_conv_param {
2288 int *min;
2289 int *max;
2290};
2291
2292static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2293 int *valp,
2294 int write, void *data)
2295{
2296 struct do_proc_dointvec_minmax_conv_param *param = data;
2297 if (write) {
2298 int val = *negp ? -*lvalp : *lvalp;
2299 if ((param->min && *param->min > val) ||
2300 (param->max && *param->max < val))
2301 return -EINVAL;
2302 *valp = val;
2303 } else {
2304 int val = *valp;
2305 if (val < 0) {
2306 *negp = true;
2307 *lvalp = -(unsigned long)val;
2308 } else {
2309 *negp = false;
2310 *lvalp = (unsigned long)val;
2311 }
2312 }
2313 return 0;
2314}
2315
2316/**
2317 * proc_dointvec_minmax - read a vector of integers with min/max values
2318 * @table: the sysctl table
2319 * @write: %TRUE if this is a write to the sysctl file
2320 * @buffer: the user buffer
2321 * @lenp: the size of the user buffer
2322 * @ppos: file position
2323 *
2324 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2325 * values from/to the user buffer, treated as an ASCII string.
2326 *
2327 * This routine will ensure the values are within the range specified by
2328 * table->extra1 (min) and table->extra2 (max).
2329 *
2330 * Returns 0 on success.
2331 */
2332int proc_dointvec_minmax(struct ctl_table *table, int write,
2333 void __user *buffer, size_t *lenp, loff_t *ppos)
2334{
2335 struct do_proc_dointvec_minmax_conv_param param = {
2336 .min = (int *) table->extra1,
2337 .max = (int *) table->extra2,
2338 };
2339 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2340 do_proc_dointvec_minmax_conv, &param);
2341}
2342
2343static void validate_coredump_safety(void)
2344{
2345#ifdef CONFIG_COREDUMP
2346 if (suid_dumpable == SUID_DUMP_ROOT &&
2347 core_pattern[0] != '/' && core_pattern[0] != '|') {
2348 printk(KERN_WARNING "Unsafe core_pattern used with "\
2349 "suid_dumpable=2. Pipe handler or fully qualified "\
2350 "core dump path required.\n");
2351 }
2352#endif
2353}
2354
2355static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2356 void __user *buffer, size_t *lenp, loff_t *ppos)
2357{
2358 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2359 if (!error)
2360 validate_coredump_safety();
2361 return error;
2362}
2363
2364#ifdef CONFIG_COREDUMP
2365static int proc_dostring_coredump(struct ctl_table *table, int write,
2366 void __user *buffer, size_t *lenp, loff_t *ppos)
2367{
2368 int error = proc_dostring(table, write, buffer, lenp, ppos);
2369 if (!error)
2370 validate_coredump_safety();
2371 return error;
2372}
2373#endif
2374
2375static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2376 void __user *buffer,
2377 size_t *lenp, loff_t *ppos,
2378 unsigned long convmul,
2379 unsigned long convdiv)
2380{
2381 unsigned long *i, *min, *max;
2382 int vleft, first = 1, err = 0;
2383 size_t left;
2384 char *kbuf = NULL, *p;
2385
2386 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2387 *lenp = 0;
2388 return 0;
2389 }
2390
2391 i = (unsigned long *) data;
2392 min = (unsigned long *) table->extra1;
2393 max = (unsigned long *) table->extra2;
2394 vleft = table->maxlen / sizeof(unsigned long);
2395 left = *lenp;
2396
2397 if (write) {
2398 if (*ppos) {
2399 switch (sysctl_writes_strict) {
2400 case SYSCTL_WRITES_STRICT:
2401 goto out;
2402 case SYSCTL_WRITES_WARN:
2403 warn_sysctl_write(table);
2404 break;
2405 default:
2406 break;
2407 }
2408 }
2409
2410 if (left > PAGE_SIZE - 1)
2411 left = PAGE_SIZE - 1;
2412 p = kbuf = memdup_user_nul(buffer, left);
2413 if (IS_ERR(kbuf))
2414 return PTR_ERR(kbuf);
2415 }
2416
2417 for (; left && vleft--; i++, first = 0) {
2418 unsigned long val;
2419
2420 if (write) {
2421 bool neg;
2422
2423 left -= proc_skip_spaces(&p);
2424
2425 err = proc_get_long(&p, &left, &val, &neg,
2426 proc_wspace_sep,
2427 sizeof(proc_wspace_sep), NULL);
2428 if (err)
2429 break;
2430 if (neg)
2431 continue;
2432 if ((min && val < *min) || (max && val > *max))
2433 continue;
2434 *i = val;
2435 } else {
2436 val = convdiv * (*i) / convmul;
2437 if (!first) {
2438 err = proc_put_char(&buffer, &left, '\t');
2439 if (err)
2440 break;
2441 }
2442 err = proc_put_long(&buffer, &left, val, false);
2443 if (err)
2444 break;
2445 }
2446 }
2447
2448 if (!write && !first && left && !err)
2449 err = proc_put_char(&buffer, &left, '\n');
2450 if (write && !err)
2451 left -= proc_skip_spaces(&p);
2452 if (write) {
2453 kfree(kbuf);
2454 if (first)
2455 return err ? : -EINVAL;
2456 }
2457 *lenp -= left;
2458out:
2459 *ppos += *lenp;
2460 return err;
2461}
2462
2463static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2464 void __user *buffer,
2465 size_t *lenp, loff_t *ppos,
2466 unsigned long convmul,
2467 unsigned long convdiv)
2468{
2469 return __do_proc_doulongvec_minmax(table->data, table, write,
2470 buffer, lenp, ppos, convmul, convdiv);
2471}
2472
2473/**
2474 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2475 * @table: the sysctl table
2476 * @write: %TRUE if this is a write to the sysctl file
2477 * @buffer: the user buffer
2478 * @lenp: the size of the user buffer
2479 * @ppos: file position
2480 *
2481 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2482 * values from/to the user buffer, treated as an ASCII string.
2483 *
2484 * This routine will ensure the values are within the range specified by
2485 * table->extra1 (min) and table->extra2 (max).
2486 *
2487 * Returns 0 on success.
2488 */
2489int proc_doulongvec_minmax(struct ctl_table *table, int write,
2490 void __user *buffer, size_t *lenp, loff_t *ppos)
2491{
2492 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2493}
2494
2495/**
2496 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2497 * @table: the sysctl table
2498 * @write: %TRUE if this is a write to the sysctl file
2499 * @buffer: the user buffer
2500 * @lenp: the size of the user buffer
2501 * @ppos: file position
2502 *
2503 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2504 * values from/to the user buffer, treated as an ASCII string. The values
2505 * are treated as milliseconds, and converted to jiffies when they are stored.
2506 *
2507 * This routine will ensure the values are within the range specified by
2508 * table->extra1 (min) and table->extra2 (max).
2509 *
2510 * Returns 0 on success.
2511 */
2512int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2513 void __user *buffer,
2514 size_t *lenp, loff_t *ppos)
2515{
2516 return do_proc_doulongvec_minmax(table, write, buffer,
2517 lenp, ppos, HZ, 1000l);
2518}
2519
2520
2521static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2522 int *valp,
2523 int write, void *data)
2524{
2525 if (write) {
2526 if (*lvalp > LONG_MAX / HZ)
2527 return 1;
2528 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2529 } else {
2530 int val = *valp;
2531 unsigned long lval;
2532 if (val < 0) {
2533 *negp = true;
2534 lval = -(unsigned long)val;
2535 } else {
2536 *negp = false;
2537 lval = (unsigned long)val;
2538 }
2539 *lvalp = lval / HZ;
2540 }
2541 return 0;
2542}
2543
2544static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2545 int *valp,
2546 int write, void *data)
2547{
2548 if (write) {
2549 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2550 return 1;
2551 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2552 } else {
2553 int val = *valp;
2554 unsigned long lval;
2555 if (val < 0) {
2556 *negp = true;
2557 lval = -(unsigned long)val;
2558 } else {
2559 *negp = false;
2560 lval = (unsigned long)val;
2561 }
2562 *lvalp = jiffies_to_clock_t(lval);
2563 }
2564 return 0;
2565}
2566
2567static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2568 int *valp,
2569 int write, void *data)
2570{
2571 if (write) {
2572 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2573
2574 if (jif > INT_MAX)
2575 return 1;
2576 *valp = (int)jif;
2577 } else {
2578 int val = *valp;
2579 unsigned long lval;
2580 if (val < 0) {
2581 *negp = true;
2582 lval = -(unsigned long)val;
2583 } else {
2584 *negp = false;
2585 lval = (unsigned long)val;
2586 }
2587 *lvalp = jiffies_to_msecs(lval);
2588 }
2589 return 0;
2590}
2591
2592/**
2593 * proc_dointvec_jiffies - read a vector of integers as seconds
2594 * @table: the sysctl table
2595 * @write: %TRUE if this is a write to the sysctl file
2596 * @buffer: the user buffer
2597 * @lenp: the size of the user buffer
2598 * @ppos: file position
2599 *
2600 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2601 * values from/to the user buffer, treated as an ASCII string.
2602 * The values read are assumed to be in seconds, and are converted into
2603 * jiffies.
2604 *
2605 * Returns 0 on success.
2606 */
2607int proc_dointvec_jiffies(struct ctl_table *table, int write,
2608 void __user *buffer, size_t *lenp, loff_t *ppos)
2609{
2610 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2611 do_proc_dointvec_jiffies_conv,NULL);
2612}
2613
2614/**
2615 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2616 * @table: the sysctl table
2617 * @write: %TRUE if this is a write to the sysctl file
2618 * @buffer: the user buffer
2619 * @lenp: the size of the user buffer
2620 * @ppos: pointer to the file position
2621 *
2622 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2623 * values from/to the user buffer, treated as an ASCII string.
2624 * The values read are assumed to be in 1/USER_HZ seconds, and
2625 * are converted into jiffies.
2626 *
2627 * Returns 0 on success.
2628 */
2629int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2630 void __user *buffer, size_t *lenp, loff_t *ppos)
2631{
2632 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2633 do_proc_dointvec_userhz_jiffies_conv,NULL);
2634}
2635
2636/**
2637 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2638 * @table: the sysctl table
2639 * @write: %TRUE if this is a write to the sysctl file
2640 * @buffer: the user buffer
2641 * @lenp: the size of the user buffer
2642 * @ppos: file position
2643 * @ppos: the current position in the file
2644 *
2645 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2646 * values from/to the user buffer, treated as an ASCII string.
2647 * The values read are assumed to be in 1/1000 seconds, and
2648 * are converted into jiffies.
2649 *
2650 * Returns 0 on success.
2651 */
2652int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2653 void __user *buffer, size_t *lenp, loff_t *ppos)
2654{
2655 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2656 do_proc_dointvec_ms_jiffies_conv, NULL);
2657}
2658
2659static int proc_do_cad_pid(struct ctl_table *table, int write,
2660 void __user *buffer, size_t *lenp, loff_t *ppos)
2661{
2662 struct pid *new_pid;
2663 pid_t tmp;
2664 int r;
2665
2666 tmp = pid_vnr(cad_pid);
2667
2668 r = __do_proc_dointvec(&tmp, table, write, buffer,
2669 lenp, ppos, NULL, NULL);
2670 if (r || !write)
2671 return r;
2672
2673 new_pid = find_get_pid(tmp);
2674 if (!new_pid)
2675 return -ESRCH;
2676
2677 put_pid(xchg(&cad_pid, new_pid));
2678 return 0;
2679}
2680
2681/**
2682 * proc_do_large_bitmap - read/write from/to a large bitmap
2683 * @table: the sysctl table
2684 * @write: %TRUE if this is a write to the sysctl file
2685 * @buffer: the user buffer
2686 * @lenp: the size of the user buffer
2687 * @ppos: file position
2688 *
2689 * The bitmap is stored at table->data and the bitmap length (in bits)
2690 * in table->maxlen.
2691 *
2692 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2693 * large bitmaps may be represented in a compact manner. Writing into
2694 * the file will clear the bitmap then update it with the given input.
2695 *
2696 * Returns 0 on success.
2697 */
2698int proc_do_large_bitmap(struct ctl_table *table, int write,
2699 void __user *buffer, size_t *lenp, loff_t *ppos)
2700{
2701 int err = 0;
2702 bool first = 1;
2703 size_t left = *lenp;
2704 unsigned long bitmap_len = table->maxlen;
2705 unsigned long *bitmap = *(unsigned long **) table->data;
2706 unsigned long *tmp_bitmap = NULL;
2707 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2708
2709 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2710 *lenp = 0;
2711 return 0;
2712 }
2713
2714 if (write) {
2715 char *kbuf, *p;
2716
2717 if (left > PAGE_SIZE - 1)
2718 left = PAGE_SIZE - 1;
2719
2720 p = kbuf = memdup_user_nul(buffer, left);
2721 if (IS_ERR(kbuf))
2722 return PTR_ERR(kbuf);
2723
2724 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2725 GFP_KERNEL);
2726 if (!tmp_bitmap) {
2727 kfree(kbuf);
2728 return -ENOMEM;
2729 }
2730 proc_skip_char(&p, &left, '\n');
2731 while (!err && left) {
2732 unsigned long val_a, val_b;
2733 bool neg;
2734
2735 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2736 sizeof(tr_a), &c);
2737 if (err)
2738 break;
2739 if (val_a >= bitmap_len || neg) {
2740 err = -EINVAL;
2741 break;
2742 }
2743
2744 val_b = val_a;
2745 if (left) {
2746 p++;
2747 left--;
2748 }
2749
2750 if (c == '-') {
2751 err = proc_get_long(&p, &left, &val_b,
2752 &neg, tr_b, sizeof(tr_b),
2753 &c);
2754 if (err)
2755 break;
2756 if (val_b >= bitmap_len || neg ||
2757 val_a > val_b) {
2758 err = -EINVAL;
2759 break;
2760 }
2761 if (left) {
2762 p++;
2763 left--;
2764 }
2765 }
2766
2767 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2768 first = 0;
2769 proc_skip_char(&p, &left, '\n');
2770 }
2771 kfree(kbuf);
2772 } else {
2773 unsigned long bit_a, bit_b = 0;
2774
2775 while (left) {
2776 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2777 if (bit_a >= bitmap_len)
2778 break;
2779 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2780 bit_a + 1) - 1;
2781
2782 if (!first) {
2783 err = proc_put_char(&buffer, &left, ',');
2784 if (err)
2785 break;
2786 }
2787 err = proc_put_long(&buffer, &left, bit_a, false);
2788 if (err)
2789 break;
2790 if (bit_a != bit_b) {
2791 err = proc_put_char(&buffer, &left, '-');
2792 if (err)
2793 break;
2794 err = proc_put_long(&buffer, &left, bit_b, false);
2795 if (err)
2796 break;
2797 }
2798
2799 first = 0; bit_b++;
2800 }
2801 if (!err)
2802 err = proc_put_char(&buffer, &left, '\n');
2803 }
2804
2805 if (!err) {
2806 if (write) {
2807 if (*ppos)
2808 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2809 else
2810 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2811 }
2812 kfree(tmp_bitmap);
2813 *lenp -= left;
2814 *ppos += *lenp;
2815 return 0;
2816 } else {
2817 kfree(tmp_bitmap);
2818 return err;
2819 }
2820}
2821
2822#else /* CONFIG_PROC_SYSCTL */
2823
2824int proc_dostring(struct ctl_table *table, int write,
2825 void __user *buffer, size_t *lenp, loff_t *ppos)
2826{
2827 return -ENOSYS;
2828}
2829
2830int proc_dointvec(struct ctl_table *table, int write,
2831 void __user *buffer, size_t *lenp, loff_t *ppos)
2832{
2833 return -ENOSYS;
2834}
2835
2836int proc_dointvec_minmax(struct ctl_table *table, int write,
2837 void __user *buffer, size_t *lenp, loff_t *ppos)
2838{
2839 return -ENOSYS;
2840}
2841
2842int proc_dointvec_jiffies(struct ctl_table *table, int write,
2843 void __user *buffer, size_t *lenp, loff_t *ppos)
2844{
2845 return -ENOSYS;
2846}
2847
2848int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2849 void __user *buffer, size_t *lenp, loff_t *ppos)
2850{
2851 return -ENOSYS;
2852}
2853
2854int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2855 void __user *buffer, size_t *lenp, loff_t *ppos)
2856{
2857 return -ENOSYS;
2858}
2859
2860int proc_doulongvec_minmax(struct ctl_table *table, int write,
2861 void __user *buffer, size_t *lenp, loff_t *ppos)
2862{
2863 return -ENOSYS;
2864}
2865
2866int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2867 void __user *buffer,
2868 size_t *lenp, loff_t *ppos)
2869{
2870 return -ENOSYS;
2871}
2872
2873
2874#endif /* CONFIG_PROC_SYSCTL */
2875
2876/*
2877 * No sense putting this after each symbol definition, twice,
2878 * exception granted :-)
2879 */
2880EXPORT_SYMBOL(proc_dointvec);
2881EXPORT_SYMBOL(proc_dointvec_jiffies);
2882EXPORT_SYMBOL(proc_dointvec_minmax);
2883EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2884EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2885EXPORT_SYMBOL(proc_dostring);
2886EXPORT_SYMBOL(proc_doulongvec_minmax);
2887EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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