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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// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sysctl.c: General linux system control interface
4 *
5 * Begun 24 March 1995, Stephen Tweedie
6 * Added /proc support, Dec 1995
7 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
8 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
9 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
10 * Dynamic registration fixes, Stephen Tweedie.
11 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
12 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Horn.
14 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
15 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
16 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * Wendling.
18 * The list_for_each() macro wasn't appropriate for the sysctl loop.
19 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
20 */
21
22#include <linux/module.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/panic.h>
30#include <linux/printk.h>
31#include <linux/proc_fs.h>
32#include <linux/security.h>
33#include <linux/ctype.h>
34#include <linux/kmemleak.h>
35#include <linux/filter.h>
36#include <linux/fs.h>
37#include <linux/init.h>
38#include <linux/kernel.h>
39#include <linux/kobject.h>
40#include <linux/net.h>
41#include <linux/sysrq.h>
42#include <linux/highuid.h>
43#include <linux/writeback.h>
44#include <linux/ratelimit.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/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/oom.h>
59#include <linux/kmod.h>
60#include <linux/capability.h>
61#include <linux/binfmts.h>
62#include <linux/sched/sysctl.h>
63#include <linux/mount.h>
64#include <linux/userfaultfd_k.h>
65#include <linux/pid.h>
66
67#include "../lib/kstrtox.h"
68
69#include <linux/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_RT_MUTEXES
81#include <linux/rtmutex.h>
82#endif
83
84/* shared constants to be used in various sysctls */
85const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 };
86EXPORT_SYMBOL(sysctl_vals);
87
88const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
89EXPORT_SYMBOL_GPL(sysctl_long_vals);
90
91#if defined(CONFIG_SYSCTL)
92
93/* Constants used for minimum and maximum */
94
95#ifdef CONFIG_PERF_EVENTS
96static const int six_hundred_forty_kb = 640 * 1024;
97#endif
98
99
100static const int ngroups_max = NGROUPS_MAX;
101static const int cap_last_cap = CAP_LAST_CAP;
102
103#ifdef CONFIG_PROC_SYSCTL
104
105/**
106 * enum sysctl_writes_mode - supported sysctl write modes
107 *
108 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
109 * to be written, and multiple writes on the same sysctl file descriptor
110 * will rewrite the sysctl value, regardless of file position. No warning
111 * is issued when the initial position is not 0.
112 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
113 * not 0.
114 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
115 * file position 0 and the value must be fully contained in the buffer
116 * sent to the write syscall. If dealing with strings respect the file
117 * position, but restrict this to the max length of the buffer, anything
118 * passed the max length will be ignored. Multiple writes will append
119 * to the buffer.
120 *
121 * These write modes control how current file position affects the behavior of
122 * updating sysctl values through the proc interface on each write.
123 */
124enum sysctl_writes_mode {
125 SYSCTL_WRITES_LEGACY = -1,
126 SYSCTL_WRITES_WARN = 0,
127 SYSCTL_WRITES_STRICT = 1,
128};
129
130static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
131#endif /* CONFIG_PROC_SYSCTL */
132
133#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
134 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
135int sysctl_legacy_va_layout;
136#endif
137
138#endif /* CONFIG_SYSCTL */
139
140/*
141 * /proc/sys support
142 */
143
144#ifdef CONFIG_PROC_SYSCTL
145
146static int _proc_do_string(char *data, int maxlen, int write,
147 char *buffer, size_t *lenp, loff_t *ppos)
148{
149 size_t len;
150 char c, *p;
151
152 if (!data || !maxlen || !*lenp) {
153 *lenp = 0;
154 return 0;
155 }
156
157 if (write) {
158 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
159 /* Only continue writes not past the end of buffer. */
160 len = strlen(data);
161 if (len > maxlen - 1)
162 len = maxlen - 1;
163
164 if (*ppos > len)
165 return 0;
166 len = *ppos;
167 } else {
168 /* Start writing from beginning of buffer. */
169 len = 0;
170 }
171
172 *ppos += *lenp;
173 p = buffer;
174 while ((p - buffer) < *lenp && len < maxlen - 1) {
175 c = *(p++);
176 if (c == 0 || c == '\n')
177 break;
178 data[len++] = c;
179 }
180 data[len] = 0;
181 } else {
182 len = strlen(data);
183 if (len > maxlen)
184 len = maxlen;
185
186 if (*ppos > len) {
187 *lenp = 0;
188 return 0;
189 }
190
191 data += *ppos;
192 len -= *ppos;
193
194 if (len > *lenp)
195 len = *lenp;
196 if (len)
197 memcpy(buffer, data, len);
198 if (len < *lenp) {
199 buffer[len] = '\n';
200 len++;
201 }
202 *lenp = len;
203 *ppos += len;
204 }
205 return 0;
206}
207
208static void warn_sysctl_write(struct ctl_table *table)
209{
210 pr_warn_once("%s wrote to %s when file position was not 0!\n"
211 "This will not be supported in the future. To silence this\n"
212 "warning, set kernel.sysctl_writes_strict = -1\n",
213 current->comm, table->procname);
214}
215
216/**
217 * proc_first_pos_non_zero_ignore - check if first position is allowed
218 * @ppos: file position
219 * @table: the sysctl table
220 *
221 * Returns true if the first position is non-zero and the sysctl_writes_strict
222 * mode indicates this is not allowed for numeric input types. String proc
223 * handlers can ignore the return value.
224 */
225static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
226 struct ctl_table *table)
227{
228 if (!*ppos)
229 return false;
230
231 switch (sysctl_writes_strict) {
232 case SYSCTL_WRITES_STRICT:
233 return true;
234 case SYSCTL_WRITES_WARN:
235 warn_sysctl_write(table);
236 return false;
237 default:
238 return false;
239 }
240}
241
242/**
243 * proc_dostring - read a string sysctl
244 * @table: the sysctl table
245 * @write: %TRUE if this is a write to the sysctl file
246 * @buffer: the user buffer
247 * @lenp: the size of the user buffer
248 * @ppos: file position
249 *
250 * Reads/writes a string from/to the user buffer. If the kernel
251 * buffer provided is not large enough to hold the string, the
252 * string is truncated. The copied string is %NULL-terminated.
253 * If the string is being read by the user process, it is copied
254 * and a newline '\n' is added. It is truncated if the buffer is
255 * not large enough.
256 *
257 * Returns 0 on success.
258 */
259int proc_dostring(struct ctl_table *table, int write,
260 void *buffer, size_t *lenp, loff_t *ppos)
261{
262 if (write)
263 proc_first_pos_non_zero_ignore(ppos, table);
264
265 return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
266 ppos);
267}
268
269static void proc_skip_spaces(char **buf, size_t *size)
270{
271 while (*size) {
272 if (!isspace(**buf))
273 break;
274 (*size)--;
275 (*buf)++;
276 }
277}
278
279static void proc_skip_char(char **buf, size_t *size, const char v)
280{
281 while (*size) {
282 if (**buf != v)
283 break;
284 (*size)--;
285 (*buf)++;
286 }
287}
288
289/**
290 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
291 * fail on overflow
292 *
293 * @cp: kernel buffer containing the string to parse
294 * @endp: pointer to store the trailing characters
295 * @base: the base to use
296 * @res: where the parsed integer will be stored
297 *
298 * In case of success 0 is returned and @res will contain the parsed integer,
299 * @endp will hold any trailing characters.
300 * This function will fail the parse on overflow. If there wasn't an overflow
301 * the function will defer the decision what characters count as invalid to the
302 * caller.
303 */
304static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
305 unsigned long *res)
306{
307 unsigned long long result;
308 unsigned int rv;
309
310 cp = _parse_integer_fixup_radix(cp, &base);
311 rv = _parse_integer(cp, base, &result);
312 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
313 return -ERANGE;
314
315 cp += rv;
316
317 if (endp)
318 *endp = (char *)cp;
319
320 *res = (unsigned long)result;
321 return 0;
322}
323
324#define TMPBUFLEN 22
325/**
326 * proc_get_long - reads an ASCII formatted integer from a user buffer
327 *
328 * @buf: a kernel buffer
329 * @size: size of the kernel buffer
330 * @val: this is where the number will be stored
331 * @neg: set to %TRUE if number is negative
332 * @perm_tr: a vector which contains the allowed trailers
333 * @perm_tr_len: size of the perm_tr vector
334 * @tr: pointer to store the trailer character
335 *
336 * In case of success %0 is returned and @buf and @size are updated with
337 * the amount of bytes read. If @tr is non-NULL and a trailing
338 * character exists (size is non-zero after returning from this
339 * function), @tr is updated with the trailing character.
340 */
341static int proc_get_long(char **buf, size_t *size,
342 unsigned long *val, bool *neg,
343 const char *perm_tr, unsigned perm_tr_len, char *tr)
344{
345 char *p, tmp[TMPBUFLEN];
346 ssize_t len = *size;
347
348 if (len <= 0)
349 return -EINVAL;
350
351 if (len > TMPBUFLEN - 1)
352 len = TMPBUFLEN - 1;
353
354 memcpy(tmp, *buf, len);
355
356 tmp[len] = 0;
357 p = tmp;
358 if (*p == '-' && *size > 1) {
359 *neg = true;
360 p++;
361 } else
362 *neg = false;
363 if (!isdigit(*p))
364 return -EINVAL;
365
366 if (strtoul_lenient(p, &p, 0, val))
367 return -EINVAL;
368
369 len = p - tmp;
370
371 /* We don't know if the next char is whitespace thus we may accept
372 * invalid integers (e.g. 1234...a) or two integers instead of one
373 * (e.g. 123...1). So lets not allow such large numbers. */
374 if (len == TMPBUFLEN - 1)
375 return -EINVAL;
376
377 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
378 return -EINVAL;
379
380 if (tr && (len < *size))
381 *tr = *p;
382
383 *buf += len;
384 *size -= len;
385
386 return 0;
387}
388
389/**
390 * proc_put_long - converts an integer to a decimal ASCII formatted string
391 *
392 * @buf: the user buffer
393 * @size: the size of the user buffer
394 * @val: the integer to be converted
395 * @neg: sign of the number, %TRUE for negative
396 *
397 * In case of success @buf and @size are updated with the amount of bytes
398 * written.
399 */
400static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
401{
402 int len;
403 char tmp[TMPBUFLEN], *p = tmp;
404
405 sprintf(p, "%s%lu", neg ? "-" : "", val);
406 len = strlen(tmp);
407 if (len > *size)
408 len = *size;
409 memcpy(*buf, tmp, len);
410 *size -= len;
411 *buf += len;
412}
413#undef TMPBUFLEN
414
415static void proc_put_char(void **buf, size_t *size, char c)
416{
417 if (*size) {
418 char **buffer = (char **)buf;
419 **buffer = c;
420
421 (*size)--;
422 (*buffer)++;
423 *buf = *buffer;
424 }
425}
426
427static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
428 int *valp,
429 int write, void *data)
430{
431 if (write) {
432 if (*negp) {
433 if (*lvalp > (unsigned long) INT_MAX + 1)
434 return -EINVAL;
435 WRITE_ONCE(*valp, -*lvalp);
436 } else {
437 if (*lvalp > (unsigned long) INT_MAX)
438 return -EINVAL;
439 WRITE_ONCE(*valp, *lvalp);
440 }
441 } else {
442 int val = READ_ONCE(*valp);
443 if (val < 0) {
444 *negp = true;
445 *lvalp = -(unsigned long)val;
446 } else {
447 *negp = false;
448 *lvalp = (unsigned long)val;
449 }
450 }
451 return 0;
452}
453
454static int do_proc_douintvec_conv(unsigned long *lvalp,
455 unsigned int *valp,
456 int write, void *data)
457{
458 if (write) {
459 if (*lvalp > UINT_MAX)
460 return -EINVAL;
461 WRITE_ONCE(*valp, *lvalp);
462 } else {
463 unsigned int val = READ_ONCE(*valp);
464 *lvalp = (unsigned long)val;
465 }
466 return 0;
467}
468
469static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
470
471static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
472 int write, void *buffer,
473 size_t *lenp, loff_t *ppos,
474 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
475 int write, void *data),
476 void *data)
477{
478 int *i, vleft, first = 1, err = 0;
479 size_t left;
480 char *p;
481
482 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
483 *lenp = 0;
484 return 0;
485 }
486
487 i = (int *) tbl_data;
488 vleft = table->maxlen / sizeof(*i);
489 left = *lenp;
490
491 if (!conv)
492 conv = do_proc_dointvec_conv;
493
494 if (write) {
495 if (proc_first_pos_non_zero_ignore(ppos, table))
496 goto out;
497
498 if (left > PAGE_SIZE - 1)
499 left = PAGE_SIZE - 1;
500 p = buffer;
501 }
502
503 for (; left && vleft--; i++, first=0) {
504 unsigned long lval;
505 bool neg;
506
507 if (write) {
508 proc_skip_spaces(&p, &left);
509
510 if (!left)
511 break;
512 err = proc_get_long(&p, &left, &lval, &neg,
513 proc_wspace_sep,
514 sizeof(proc_wspace_sep), NULL);
515 if (err)
516 break;
517 if (conv(&neg, &lval, i, 1, data)) {
518 err = -EINVAL;
519 break;
520 }
521 } else {
522 if (conv(&neg, &lval, i, 0, data)) {
523 err = -EINVAL;
524 break;
525 }
526 if (!first)
527 proc_put_char(&buffer, &left, '\t');
528 proc_put_long(&buffer, &left, lval, neg);
529 }
530 }
531
532 if (!write && !first && left && !err)
533 proc_put_char(&buffer, &left, '\n');
534 if (write && !err && left)
535 proc_skip_spaces(&p, &left);
536 if (write && first)
537 return err ? : -EINVAL;
538 *lenp -= left;
539out:
540 *ppos += *lenp;
541 return err;
542}
543
544static int do_proc_dointvec(struct ctl_table *table, int write,
545 void *buffer, size_t *lenp, loff_t *ppos,
546 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
547 int write, void *data),
548 void *data)
549{
550 return __do_proc_dointvec(table->data, table, write,
551 buffer, lenp, ppos, conv, data);
552}
553
554static int do_proc_douintvec_w(unsigned int *tbl_data,
555 struct ctl_table *table,
556 void *buffer,
557 size_t *lenp, loff_t *ppos,
558 int (*conv)(unsigned long *lvalp,
559 unsigned int *valp,
560 int write, void *data),
561 void *data)
562{
563 unsigned long lval;
564 int err = 0;
565 size_t left;
566 bool neg;
567 char *p = buffer;
568
569 left = *lenp;
570
571 if (proc_first_pos_non_zero_ignore(ppos, table))
572 goto bail_early;
573
574 if (left > PAGE_SIZE - 1)
575 left = PAGE_SIZE - 1;
576
577 proc_skip_spaces(&p, &left);
578 if (!left) {
579 err = -EINVAL;
580 goto out_free;
581 }
582
583 err = proc_get_long(&p, &left, &lval, &neg,
584 proc_wspace_sep,
585 sizeof(proc_wspace_sep), NULL);
586 if (err || neg) {
587 err = -EINVAL;
588 goto out_free;
589 }
590
591 if (conv(&lval, tbl_data, 1, data)) {
592 err = -EINVAL;
593 goto out_free;
594 }
595
596 if (!err && left)
597 proc_skip_spaces(&p, &left);
598
599out_free:
600 if (err)
601 return -EINVAL;
602
603 return 0;
604
605 /* This is in keeping with old __do_proc_dointvec() */
606bail_early:
607 *ppos += *lenp;
608 return err;
609}
610
611static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
612 size_t *lenp, loff_t *ppos,
613 int (*conv)(unsigned long *lvalp,
614 unsigned int *valp,
615 int write, void *data),
616 void *data)
617{
618 unsigned long lval;
619 int err = 0;
620 size_t left;
621
622 left = *lenp;
623
624 if (conv(&lval, tbl_data, 0, data)) {
625 err = -EINVAL;
626 goto out;
627 }
628
629 proc_put_long(&buffer, &left, lval, false);
630 if (!left)
631 goto out;
632
633 proc_put_char(&buffer, &left, '\n');
634
635out:
636 *lenp -= left;
637 *ppos += *lenp;
638
639 return err;
640}
641
642static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
643 int write, void *buffer,
644 size_t *lenp, loff_t *ppos,
645 int (*conv)(unsigned long *lvalp,
646 unsigned int *valp,
647 int write, void *data),
648 void *data)
649{
650 unsigned int *i, vleft;
651
652 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
653 *lenp = 0;
654 return 0;
655 }
656
657 i = (unsigned int *) tbl_data;
658 vleft = table->maxlen / sizeof(*i);
659
660 /*
661 * Arrays are not supported, keep this simple. *Do not* add
662 * support for them.
663 */
664 if (vleft != 1) {
665 *lenp = 0;
666 return -EINVAL;
667 }
668
669 if (!conv)
670 conv = do_proc_douintvec_conv;
671
672 if (write)
673 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
674 conv, data);
675 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
676}
677
678int do_proc_douintvec(struct ctl_table *table, int write,
679 void *buffer, size_t *lenp, loff_t *ppos,
680 int (*conv)(unsigned long *lvalp,
681 unsigned int *valp,
682 int write, void *data),
683 void *data)
684{
685 return __do_proc_douintvec(table->data, table, write,
686 buffer, lenp, ppos, conv, data);
687}
688
689/**
690 * proc_dobool - read/write a bool
691 * @table: the sysctl table
692 * @write: %TRUE if this is a write to the sysctl file
693 * @buffer: the user buffer
694 * @lenp: the size of the user buffer
695 * @ppos: file position
696 *
697 * Reads/writes one integer value from/to the user buffer,
698 * treated as an ASCII string.
699 *
700 * table->data must point to a bool variable and table->maxlen must
701 * be sizeof(bool).
702 *
703 * Returns 0 on success.
704 */
705int proc_dobool(struct ctl_table *table, int write, void *buffer,
706 size_t *lenp, loff_t *ppos)
707{
708 struct ctl_table tmp;
709 bool *data = table->data;
710 int res, val;
711
712 /* Do not support arrays yet. */
713 if (table->maxlen != sizeof(bool))
714 return -EINVAL;
715
716 tmp = *table;
717 tmp.maxlen = sizeof(val);
718 tmp.data = &val;
719
720 val = READ_ONCE(*data);
721 res = proc_dointvec(&tmp, write, buffer, lenp, ppos);
722 if (res)
723 return res;
724 if (write)
725 WRITE_ONCE(*data, val);
726 return 0;
727}
728
729/**
730 * proc_dointvec - read a vector of integers
731 * @table: the sysctl table
732 * @write: %TRUE if this is a write to the sysctl file
733 * @buffer: the user buffer
734 * @lenp: the size of the user buffer
735 * @ppos: file position
736 *
737 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
738 * values from/to the user buffer, treated as an ASCII string.
739 *
740 * Returns 0 on success.
741 */
742int proc_dointvec(struct ctl_table *table, int write, void *buffer,
743 size_t *lenp, loff_t *ppos)
744{
745 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
746}
747
748/**
749 * proc_douintvec - read a vector of unsigned integers
750 * @table: the sysctl table
751 * @write: %TRUE if this is a write to the sysctl file
752 * @buffer: the user buffer
753 * @lenp: the size of the user buffer
754 * @ppos: file position
755 *
756 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
757 * values from/to the user buffer, treated as an ASCII string.
758 *
759 * Returns 0 on success.
760 */
761int proc_douintvec(struct ctl_table *table, int write, void *buffer,
762 size_t *lenp, loff_t *ppos)
763{
764 return do_proc_douintvec(table, write, buffer, lenp, ppos,
765 do_proc_douintvec_conv, NULL);
766}
767
768/*
769 * Taint values can only be increased
770 * This means we can safely use a temporary.
771 */
772static int proc_taint(struct ctl_table *table, int write,
773 void *buffer, size_t *lenp, loff_t *ppos)
774{
775 struct ctl_table t;
776 unsigned long tmptaint = get_taint();
777 int err;
778
779 if (write && !capable(CAP_SYS_ADMIN))
780 return -EPERM;
781
782 t = *table;
783 t.data = &tmptaint;
784 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
785 if (err < 0)
786 return err;
787
788 if (write) {
789 int i;
790
791 /*
792 * If we are relying on panic_on_taint not producing
793 * false positives due to userspace input, bail out
794 * before setting the requested taint flags.
795 */
796 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
797 return -EINVAL;
798
799 /*
800 * Poor man's atomic or. Not worth adding a primitive
801 * to everyone's atomic.h for this
802 */
803 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
804 if ((1UL << i) & tmptaint)
805 add_taint(i, LOCKDEP_STILL_OK);
806 }
807
808 return err;
809}
810
811/**
812 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
813 * @min: pointer to minimum allowable value
814 * @max: pointer to maximum allowable value
815 *
816 * The do_proc_dointvec_minmax_conv_param structure provides the
817 * minimum and maximum values for doing range checking for those sysctl
818 * parameters that use the proc_dointvec_minmax() handler.
819 */
820struct do_proc_dointvec_minmax_conv_param {
821 int *min;
822 int *max;
823};
824
825static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
826 int *valp,
827 int write, void *data)
828{
829 int tmp, ret;
830 struct do_proc_dointvec_minmax_conv_param *param = data;
831 /*
832 * If writing, first do so via a temporary local int so we can
833 * bounds-check it before touching *valp.
834 */
835 int *ip = write ? &tmp : valp;
836
837 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
838 if (ret)
839 return ret;
840
841 if (write) {
842 if ((param->min && *param->min > tmp) ||
843 (param->max && *param->max < tmp))
844 return -EINVAL;
845 WRITE_ONCE(*valp, tmp);
846 }
847
848 return 0;
849}
850
851/**
852 * proc_dointvec_minmax - read a vector of integers with min/max values
853 * @table: the sysctl table
854 * @write: %TRUE if this is a write to the sysctl file
855 * @buffer: the user buffer
856 * @lenp: the size of the user buffer
857 * @ppos: file position
858 *
859 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
860 * values from/to the user buffer, treated as an ASCII string.
861 *
862 * This routine will ensure the values are within the range specified by
863 * table->extra1 (min) and table->extra2 (max).
864 *
865 * Returns 0 on success or -EINVAL on write when the range check fails.
866 */
867int proc_dointvec_minmax(struct ctl_table *table, int write,
868 void *buffer, size_t *lenp, loff_t *ppos)
869{
870 struct do_proc_dointvec_minmax_conv_param param = {
871 .min = (int *) table->extra1,
872 .max = (int *) table->extra2,
873 };
874 return do_proc_dointvec(table, write, buffer, lenp, ppos,
875 do_proc_dointvec_minmax_conv, ¶m);
876}
877
878/**
879 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
880 * @min: pointer to minimum allowable value
881 * @max: pointer to maximum allowable value
882 *
883 * The do_proc_douintvec_minmax_conv_param structure provides the
884 * minimum and maximum values for doing range checking for those sysctl
885 * parameters that use the proc_douintvec_minmax() handler.
886 */
887struct do_proc_douintvec_minmax_conv_param {
888 unsigned int *min;
889 unsigned int *max;
890};
891
892static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
893 unsigned int *valp,
894 int write, void *data)
895{
896 int ret;
897 unsigned int tmp;
898 struct do_proc_douintvec_minmax_conv_param *param = data;
899 /* write via temporary local uint for bounds-checking */
900 unsigned int *up = write ? &tmp : valp;
901
902 ret = do_proc_douintvec_conv(lvalp, up, write, data);
903 if (ret)
904 return ret;
905
906 if (write) {
907 if ((param->min && *param->min > tmp) ||
908 (param->max && *param->max < tmp))
909 return -ERANGE;
910
911 WRITE_ONCE(*valp, tmp);
912 }
913
914 return 0;
915}
916
917/**
918 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
919 * @table: the sysctl table
920 * @write: %TRUE if this is a write to the sysctl file
921 * @buffer: the user buffer
922 * @lenp: the size of the user buffer
923 * @ppos: file position
924 *
925 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
926 * values from/to the user buffer, treated as an ASCII string. Negative
927 * strings are not allowed.
928 *
929 * This routine will ensure the values are within the range specified by
930 * table->extra1 (min) and table->extra2 (max). There is a final sanity
931 * check for UINT_MAX to avoid having to support wrap around uses from
932 * userspace.
933 *
934 * Returns 0 on success or -ERANGE on write when the range check fails.
935 */
936int proc_douintvec_minmax(struct ctl_table *table, int write,
937 void *buffer, size_t *lenp, loff_t *ppos)
938{
939 struct do_proc_douintvec_minmax_conv_param param = {
940 .min = (unsigned int *) table->extra1,
941 .max = (unsigned int *) table->extra2,
942 };
943 return do_proc_douintvec(table, write, buffer, lenp, ppos,
944 do_proc_douintvec_minmax_conv, ¶m);
945}
946
947/**
948 * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
949 * @table: the sysctl table
950 * @write: %TRUE if this is a write to the sysctl file
951 * @buffer: the user buffer
952 * @lenp: the size of the user buffer
953 * @ppos: file position
954 *
955 * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
956 * values from/to the user buffer, treated as an ASCII string. Negative
957 * strings are not allowed.
958 *
959 * This routine will ensure the values are within the range specified by
960 * table->extra1 (min) and table->extra2 (max).
961 *
962 * Returns 0 on success or an error on write when the range check fails.
963 */
964int proc_dou8vec_minmax(struct ctl_table *table, int write,
965 void *buffer, size_t *lenp, loff_t *ppos)
966{
967 struct ctl_table tmp;
968 unsigned int min = 0, max = 255U, val;
969 u8 *data = table->data;
970 struct do_proc_douintvec_minmax_conv_param param = {
971 .min = &min,
972 .max = &max,
973 };
974 int res;
975
976 /* Do not support arrays yet. */
977 if (table->maxlen != sizeof(u8))
978 return -EINVAL;
979
980 if (table->extra1) {
981 min = *(unsigned int *) table->extra1;
982 if (min > 255U)
983 return -EINVAL;
984 }
985 if (table->extra2) {
986 max = *(unsigned int *) table->extra2;
987 if (max > 255U)
988 return -EINVAL;
989 }
990
991 tmp = *table;
992
993 tmp.maxlen = sizeof(val);
994 tmp.data = &val;
995 val = READ_ONCE(*data);
996 res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
997 do_proc_douintvec_minmax_conv, ¶m);
998 if (res)
999 return res;
1000 if (write)
1001 WRITE_ONCE(*data, val);
1002 return 0;
1003}
1004EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
1005
1006#ifdef CONFIG_MAGIC_SYSRQ
1007static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1008 void *buffer, size_t *lenp, loff_t *ppos)
1009{
1010 int tmp, ret;
1011
1012 tmp = sysrq_mask();
1013
1014 ret = __do_proc_dointvec(&tmp, table, write, buffer,
1015 lenp, ppos, NULL, NULL);
1016 if (ret || !write)
1017 return ret;
1018
1019 if (write)
1020 sysrq_toggle_support(tmp);
1021
1022 return 0;
1023}
1024#endif
1025
1026static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1027 int write, void *buffer, size_t *lenp, loff_t *ppos,
1028 unsigned long convmul, unsigned long convdiv)
1029{
1030 unsigned long *i, *min, *max;
1031 int vleft, first = 1, err = 0;
1032 size_t left;
1033 char *p;
1034
1035 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1036 *lenp = 0;
1037 return 0;
1038 }
1039
1040 i = data;
1041 min = table->extra1;
1042 max = table->extra2;
1043 vleft = table->maxlen / sizeof(unsigned long);
1044 left = *lenp;
1045
1046 if (write) {
1047 if (proc_first_pos_non_zero_ignore(ppos, table))
1048 goto out;
1049
1050 if (left > PAGE_SIZE - 1)
1051 left = PAGE_SIZE - 1;
1052 p = buffer;
1053 }
1054
1055 for (; left && vleft--; i++, first = 0) {
1056 unsigned long val;
1057
1058 if (write) {
1059 bool neg;
1060
1061 proc_skip_spaces(&p, &left);
1062 if (!left)
1063 break;
1064
1065 err = proc_get_long(&p, &left, &val, &neg,
1066 proc_wspace_sep,
1067 sizeof(proc_wspace_sep), NULL);
1068 if (err || neg) {
1069 err = -EINVAL;
1070 break;
1071 }
1072
1073 val = convmul * val / convdiv;
1074 if ((min && val < *min) || (max && val > *max)) {
1075 err = -EINVAL;
1076 break;
1077 }
1078 WRITE_ONCE(*i, val);
1079 } else {
1080 val = convdiv * READ_ONCE(*i) / convmul;
1081 if (!first)
1082 proc_put_char(&buffer, &left, '\t');
1083 proc_put_long(&buffer, &left, val, false);
1084 }
1085 }
1086
1087 if (!write && !first && left && !err)
1088 proc_put_char(&buffer, &left, '\n');
1089 if (write && !err)
1090 proc_skip_spaces(&p, &left);
1091 if (write && first)
1092 return err ? : -EINVAL;
1093 *lenp -= left;
1094out:
1095 *ppos += *lenp;
1096 return err;
1097}
1098
1099static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1100 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1101 unsigned long convdiv)
1102{
1103 return __do_proc_doulongvec_minmax(table->data, table, write,
1104 buffer, lenp, ppos, convmul, convdiv);
1105}
1106
1107/**
1108 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1109 * @table: the sysctl table
1110 * @write: %TRUE if this is a write to the sysctl file
1111 * @buffer: the user buffer
1112 * @lenp: the size of the user buffer
1113 * @ppos: file position
1114 *
1115 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1116 * values from/to the user buffer, treated as an ASCII string.
1117 *
1118 * This routine will ensure the values are within the range specified by
1119 * table->extra1 (min) and table->extra2 (max).
1120 *
1121 * Returns 0 on success.
1122 */
1123int proc_doulongvec_minmax(struct ctl_table *table, int write,
1124 void *buffer, size_t *lenp, loff_t *ppos)
1125{
1126 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1127}
1128
1129/**
1130 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1131 * @table: the sysctl table
1132 * @write: %TRUE if this is a write to the sysctl file
1133 * @buffer: the user buffer
1134 * @lenp: the size of the user buffer
1135 * @ppos: file position
1136 *
1137 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1138 * values from/to the user buffer, treated as an ASCII string. The values
1139 * are treated as milliseconds, and converted to jiffies when they are stored.
1140 *
1141 * This routine will ensure the values are within the range specified by
1142 * table->extra1 (min) and table->extra2 (max).
1143 *
1144 * Returns 0 on success.
1145 */
1146int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1147 void *buffer, size_t *lenp, loff_t *ppos)
1148{
1149 return do_proc_doulongvec_minmax(table, write, buffer,
1150 lenp, ppos, HZ, 1000l);
1151}
1152
1153
1154static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1155 int *valp,
1156 int write, void *data)
1157{
1158 if (write) {
1159 if (*lvalp > INT_MAX / HZ)
1160 return 1;
1161 if (*negp)
1162 WRITE_ONCE(*valp, -*lvalp * HZ);
1163 else
1164 WRITE_ONCE(*valp, *lvalp * HZ);
1165 } else {
1166 int val = READ_ONCE(*valp);
1167 unsigned long lval;
1168 if (val < 0) {
1169 *negp = true;
1170 lval = -(unsigned long)val;
1171 } else {
1172 *negp = false;
1173 lval = (unsigned long)val;
1174 }
1175 *lvalp = lval / HZ;
1176 }
1177 return 0;
1178}
1179
1180static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1181 int *valp,
1182 int write, void *data)
1183{
1184 if (write) {
1185 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1186 return 1;
1187 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1188 } else {
1189 int val = *valp;
1190 unsigned long lval;
1191 if (val < 0) {
1192 *negp = true;
1193 lval = -(unsigned long)val;
1194 } else {
1195 *negp = false;
1196 lval = (unsigned long)val;
1197 }
1198 *lvalp = jiffies_to_clock_t(lval);
1199 }
1200 return 0;
1201}
1202
1203static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1204 int *valp,
1205 int write, void *data)
1206{
1207 if (write) {
1208 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1209
1210 if (jif > INT_MAX)
1211 return 1;
1212 WRITE_ONCE(*valp, (int)jif);
1213 } else {
1214 int val = READ_ONCE(*valp);
1215 unsigned long lval;
1216 if (val < 0) {
1217 *negp = true;
1218 lval = -(unsigned long)val;
1219 } else {
1220 *negp = false;
1221 lval = (unsigned long)val;
1222 }
1223 *lvalp = jiffies_to_msecs(lval);
1224 }
1225 return 0;
1226}
1227
1228static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp,
1229 int *valp, int write, void *data)
1230{
1231 int tmp, ret;
1232 struct do_proc_dointvec_minmax_conv_param *param = data;
1233 /*
1234 * If writing, first do so via a temporary local int so we can
1235 * bounds-check it before touching *valp.
1236 */
1237 int *ip = write ? &tmp : valp;
1238
1239 ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);
1240 if (ret)
1241 return ret;
1242
1243 if (write) {
1244 if ((param->min && *param->min > tmp) ||
1245 (param->max && *param->max < tmp))
1246 return -EINVAL;
1247 *valp = tmp;
1248 }
1249 return 0;
1250}
1251
1252/**
1253 * proc_dointvec_jiffies - read a vector of integers as seconds
1254 * @table: the sysctl table
1255 * @write: %TRUE if this is a write to the sysctl file
1256 * @buffer: the user buffer
1257 * @lenp: the size of the user buffer
1258 * @ppos: file position
1259 *
1260 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1261 * values from/to the user buffer, treated as an ASCII string.
1262 * The values read are assumed to be in seconds, and are converted into
1263 * jiffies.
1264 *
1265 * Returns 0 on success.
1266 */
1267int proc_dointvec_jiffies(struct ctl_table *table, int write,
1268 void *buffer, size_t *lenp, loff_t *ppos)
1269{
1270 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1271 do_proc_dointvec_jiffies_conv,NULL);
1272}
1273
1274int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1275 void *buffer, size_t *lenp, loff_t *ppos)
1276{
1277 struct do_proc_dointvec_minmax_conv_param param = {
1278 .min = (int *) table->extra1,
1279 .max = (int *) table->extra2,
1280 };
1281 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1282 do_proc_dointvec_ms_jiffies_minmax_conv, ¶m);
1283}
1284
1285/**
1286 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1287 * @table: the sysctl table
1288 * @write: %TRUE if this is a write to the sysctl file
1289 * @buffer: the user buffer
1290 * @lenp: the size of the user buffer
1291 * @ppos: pointer to the file position
1292 *
1293 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1294 * values from/to the user buffer, treated as an ASCII string.
1295 * The values read are assumed to be in 1/USER_HZ seconds, and
1296 * are converted into jiffies.
1297 *
1298 * Returns 0 on success.
1299 */
1300int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1301 void *buffer, size_t *lenp, loff_t *ppos)
1302{
1303 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1304 do_proc_dointvec_userhz_jiffies_conv, NULL);
1305}
1306
1307/**
1308 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1309 * @table: the sysctl table
1310 * @write: %TRUE if this is a write to the sysctl file
1311 * @buffer: the user buffer
1312 * @lenp: the size of the user buffer
1313 * @ppos: file position
1314 * @ppos: the current position in the file
1315 *
1316 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1317 * values from/to the user buffer, treated as an ASCII string.
1318 * The values read are assumed to be in 1/1000 seconds, and
1319 * are converted into jiffies.
1320 *
1321 * Returns 0 on success.
1322 */
1323int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1324 size_t *lenp, loff_t *ppos)
1325{
1326 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1327 do_proc_dointvec_ms_jiffies_conv, NULL);
1328}
1329
1330static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1331 size_t *lenp, loff_t *ppos)
1332{
1333 struct pid *new_pid;
1334 pid_t tmp;
1335 int r;
1336
1337 tmp = pid_vnr(cad_pid);
1338
1339 r = __do_proc_dointvec(&tmp, table, write, buffer,
1340 lenp, ppos, NULL, NULL);
1341 if (r || !write)
1342 return r;
1343
1344 new_pid = find_get_pid(tmp);
1345 if (!new_pid)
1346 return -ESRCH;
1347
1348 put_pid(xchg(&cad_pid, new_pid));
1349 return 0;
1350}
1351
1352/**
1353 * proc_do_large_bitmap - read/write from/to a large bitmap
1354 * @table: the sysctl table
1355 * @write: %TRUE if this is a write to the sysctl file
1356 * @buffer: the user buffer
1357 * @lenp: the size of the user buffer
1358 * @ppos: file position
1359 *
1360 * The bitmap is stored at table->data and the bitmap length (in bits)
1361 * in table->maxlen.
1362 *
1363 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1364 * large bitmaps may be represented in a compact manner. Writing into
1365 * the file will clear the bitmap then update it with the given input.
1366 *
1367 * Returns 0 on success.
1368 */
1369int proc_do_large_bitmap(struct ctl_table *table, int write,
1370 void *buffer, size_t *lenp, loff_t *ppos)
1371{
1372 int err = 0;
1373 size_t left = *lenp;
1374 unsigned long bitmap_len = table->maxlen;
1375 unsigned long *bitmap = *(unsigned long **) table->data;
1376 unsigned long *tmp_bitmap = NULL;
1377 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1378
1379 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1380 *lenp = 0;
1381 return 0;
1382 }
1383
1384 if (write) {
1385 char *p = buffer;
1386 size_t skipped = 0;
1387
1388 if (left > PAGE_SIZE - 1) {
1389 left = PAGE_SIZE - 1;
1390 /* How much of the buffer we'll skip this pass */
1391 skipped = *lenp - left;
1392 }
1393
1394 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1395 if (!tmp_bitmap)
1396 return -ENOMEM;
1397 proc_skip_char(&p, &left, '\n');
1398 while (!err && left) {
1399 unsigned long val_a, val_b;
1400 bool neg;
1401 size_t saved_left;
1402
1403 /* In case we stop parsing mid-number, we can reset */
1404 saved_left = left;
1405 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1406 sizeof(tr_a), &c);
1407 /*
1408 * If we consumed the entirety of a truncated buffer or
1409 * only one char is left (may be a "-"), then stop here,
1410 * reset, & come back for more.
1411 */
1412 if ((left <= 1) && skipped) {
1413 left = saved_left;
1414 break;
1415 }
1416
1417 if (err)
1418 break;
1419 if (val_a >= bitmap_len || neg) {
1420 err = -EINVAL;
1421 break;
1422 }
1423
1424 val_b = val_a;
1425 if (left) {
1426 p++;
1427 left--;
1428 }
1429
1430 if (c == '-') {
1431 err = proc_get_long(&p, &left, &val_b,
1432 &neg, tr_b, sizeof(tr_b),
1433 &c);
1434 /*
1435 * If we consumed all of a truncated buffer or
1436 * then stop here, reset, & come back for more.
1437 */
1438 if (!left && skipped) {
1439 left = saved_left;
1440 break;
1441 }
1442
1443 if (err)
1444 break;
1445 if (val_b >= bitmap_len || neg ||
1446 val_a > val_b) {
1447 err = -EINVAL;
1448 break;
1449 }
1450 if (left) {
1451 p++;
1452 left--;
1453 }
1454 }
1455
1456 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1457 proc_skip_char(&p, &left, '\n');
1458 }
1459 left += skipped;
1460 } else {
1461 unsigned long bit_a, bit_b = 0;
1462 bool first = 1;
1463
1464 while (left) {
1465 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1466 if (bit_a >= bitmap_len)
1467 break;
1468 bit_b = find_next_zero_bit(bitmap, bitmap_len,
1469 bit_a + 1) - 1;
1470
1471 if (!first)
1472 proc_put_char(&buffer, &left, ',');
1473 proc_put_long(&buffer, &left, bit_a, false);
1474 if (bit_a != bit_b) {
1475 proc_put_char(&buffer, &left, '-');
1476 proc_put_long(&buffer, &left, bit_b, false);
1477 }
1478
1479 first = 0; bit_b++;
1480 }
1481 proc_put_char(&buffer, &left, '\n');
1482 }
1483
1484 if (!err) {
1485 if (write) {
1486 if (*ppos)
1487 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1488 else
1489 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1490 }
1491 *lenp -= left;
1492 *ppos += *lenp;
1493 }
1494
1495 bitmap_free(tmp_bitmap);
1496 return err;
1497}
1498
1499#else /* CONFIG_PROC_SYSCTL */
1500
1501int proc_dostring(struct ctl_table *table, int write,
1502 void *buffer, size_t *lenp, loff_t *ppos)
1503{
1504 return -ENOSYS;
1505}
1506
1507int proc_dobool(struct ctl_table *table, int write,
1508 void *buffer, size_t *lenp, loff_t *ppos)
1509{
1510 return -ENOSYS;
1511}
1512
1513int proc_dointvec(struct ctl_table *table, int write,
1514 void *buffer, size_t *lenp, loff_t *ppos)
1515{
1516 return -ENOSYS;
1517}
1518
1519int proc_douintvec(struct ctl_table *table, int write,
1520 void *buffer, size_t *lenp, loff_t *ppos)
1521{
1522 return -ENOSYS;
1523}
1524
1525int proc_dointvec_minmax(struct ctl_table *table, int write,
1526 void *buffer, size_t *lenp, loff_t *ppos)
1527{
1528 return -ENOSYS;
1529}
1530
1531int proc_douintvec_minmax(struct ctl_table *table, int write,
1532 void *buffer, size_t *lenp, loff_t *ppos)
1533{
1534 return -ENOSYS;
1535}
1536
1537int proc_dou8vec_minmax(struct ctl_table *table, int write,
1538 void *buffer, size_t *lenp, loff_t *ppos)
1539{
1540 return -ENOSYS;
1541}
1542
1543int proc_dointvec_jiffies(struct ctl_table *table, int write,
1544 void *buffer, size_t *lenp, loff_t *ppos)
1545{
1546 return -ENOSYS;
1547}
1548
1549int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1550 void *buffer, size_t *lenp, loff_t *ppos)
1551{
1552 return -ENOSYS;
1553}
1554
1555int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1556 void *buffer, size_t *lenp, loff_t *ppos)
1557{
1558 return -ENOSYS;
1559}
1560
1561int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1562 void *buffer, size_t *lenp, loff_t *ppos)
1563{
1564 return -ENOSYS;
1565}
1566
1567int proc_doulongvec_minmax(struct ctl_table *table, int write,
1568 void *buffer, size_t *lenp, loff_t *ppos)
1569{
1570 return -ENOSYS;
1571}
1572
1573int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1574 void *buffer, size_t *lenp, loff_t *ppos)
1575{
1576 return -ENOSYS;
1577}
1578
1579int proc_do_large_bitmap(struct ctl_table *table, int write,
1580 void *buffer, size_t *lenp, loff_t *ppos)
1581{
1582 return -ENOSYS;
1583}
1584
1585#endif /* CONFIG_PROC_SYSCTL */
1586
1587#if defined(CONFIG_SYSCTL)
1588int proc_do_static_key(struct ctl_table *table, int write,
1589 void *buffer, size_t *lenp, loff_t *ppos)
1590{
1591 struct static_key *key = (struct static_key *)table->data;
1592 static DEFINE_MUTEX(static_key_mutex);
1593 int val, ret;
1594 struct ctl_table tmp = {
1595 .data = &val,
1596 .maxlen = sizeof(val),
1597 .mode = table->mode,
1598 .extra1 = SYSCTL_ZERO,
1599 .extra2 = SYSCTL_ONE,
1600 };
1601
1602 if (write && !capable(CAP_SYS_ADMIN))
1603 return -EPERM;
1604
1605 mutex_lock(&static_key_mutex);
1606 val = static_key_enabled(key);
1607 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1608 if (write && !ret) {
1609 if (val)
1610 static_key_enable(key);
1611 else
1612 static_key_disable(key);
1613 }
1614 mutex_unlock(&static_key_mutex);
1615 return ret;
1616}
1617
1618static struct ctl_table kern_table[] = {
1619 {
1620 .procname = "panic",
1621 .data = &panic_timeout,
1622 .maxlen = sizeof(int),
1623 .mode = 0644,
1624 .proc_handler = proc_dointvec,
1625 },
1626#ifdef CONFIG_PROC_SYSCTL
1627 {
1628 .procname = "tainted",
1629 .maxlen = sizeof(long),
1630 .mode = 0644,
1631 .proc_handler = proc_taint,
1632 },
1633 {
1634 .procname = "sysctl_writes_strict",
1635 .data = &sysctl_writes_strict,
1636 .maxlen = sizeof(int),
1637 .mode = 0644,
1638 .proc_handler = proc_dointvec_minmax,
1639 .extra1 = SYSCTL_NEG_ONE,
1640 .extra2 = SYSCTL_ONE,
1641 },
1642#endif
1643 {
1644 .procname = "print-fatal-signals",
1645 .data = &print_fatal_signals,
1646 .maxlen = sizeof(int),
1647 .mode = 0644,
1648 .proc_handler = proc_dointvec,
1649 },
1650#ifdef CONFIG_SPARC
1651 {
1652 .procname = "reboot-cmd",
1653 .data = reboot_command,
1654 .maxlen = 256,
1655 .mode = 0644,
1656 .proc_handler = proc_dostring,
1657 },
1658 {
1659 .procname = "stop-a",
1660 .data = &stop_a_enabled,
1661 .maxlen = sizeof (int),
1662 .mode = 0644,
1663 .proc_handler = proc_dointvec,
1664 },
1665 {
1666 .procname = "scons-poweroff",
1667 .data = &scons_pwroff,
1668 .maxlen = sizeof (int),
1669 .mode = 0644,
1670 .proc_handler = proc_dointvec,
1671 },
1672#endif
1673#ifdef CONFIG_SPARC64
1674 {
1675 .procname = "tsb-ratio",
1676 .data = &sysctl_tsb_ratio,
1677 .maxlen = sizeof (int),
1678 .mode = 0644,
1679 .proc_handler = proc_dointvec,
1680 },
1681#endif
1682#ifdef CONFIG_PARISC
1683 {
1684 .procname = "soft-power",
1685 .data = &pwrsw_enabled,
1686 .maxlen = sizeof (int),
1687 .mode = 0644,
1688 .proc_handler = proc_dointvec,
1689 },
1690#endif
1691#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1692 {
1693 .procname = "unaligned-trap",
1694 .data = &unaligned_enabled,
1695 .maxlen = sizeof (int),
1696 .mode = 0644,
1697 .proc_handler = proc_dointvec,
1698 },
1699#endif
1700#ifdef CONFIG_STACK_TRACER
1701 {
1702 .procname = "stack_tracer_enabled",
1703 .data = &stack_tracer_enabled,
1704 .maxlen = sizeof(int),
1705 .mode = 0644,
1706 .proc_handler = stack_trace_sysctl,
1707 },
1708#endif
1709#ifdef CONFIG_TRACING
1710 {
1711 .procname = "ftrace_dump_on_oops",
1712 .data = &ftrace_dump_on_oops,
1713 .maxlen = sizeof(int),
1714 .mode = 0644,
1715 .proc_handler = proc_dointvec,
1716 },
1717 {
1718 .procname = "traceoff_on_warning",
1719 .data = &__disable_trace_on_warning,
1720 .maxlen = sizeof(__disable_trace_on_warning),
1721 .mode = 0644,
1722 .proc_handler = proc_dointvec,
1723 },
1724 {
1725 .procname = "tracepoint_printk",
1726 .data = &tracepoint_printk,
1727 .maxlen = sizeof(tracepoint_printk),
1728 .mode = 0644,
1729 .proc_handler = tracepoint_printk_sysctl,
1730 },
1731#endif
1732#ifdef CONFIG_MODULES
1733 {
1734 .procname = "modprobe",
1735 .data = &modprobe_path,
1736 .maxlen = KMOD_PATH_LEN,
1737 .mode = 0644,
1738 .proc_handler = proc_dostring,
1739 },
1740 {
1741 .procname = "modules_disabled",
1742 .data = &modules_disabled,
1743 .maxlen = sizeof(int),
1744 .mode = 0644,
1745 /* only handle a transition from default "0" to "1" */
1746 .proc_handler = proc_dointvec_minmax,
1747 .extra1 = SYSCTL_ONE,
1748 .extra2 = SYSCTL_ONE,
1749 },
1750#endif
1751#ifdef CONFIG_UEVENT_HELPER
1752 {
1753 .procname = "hotplug",
1754 .data = &uevent_helper,
1755 .maxlen = UEVENT_HELPER_PATH_LEN,
1756 .mode = 0644,
1757 .proc_handler = proc_dostring,
1758 },
1759#endif
1760#ifdef CONFIG_MAGIC_SYSRQ
1761 {
1762 .procname = "sysrq",
1763 .data = NULL,
1764 .maxlen = sizeof (int),
1765 .mode = 0644,
1766 .proc_handler = sysrq_sysctl_handler,
1767 },
1768#endif
1769#ifdef CONFIG_PROC_SYSCTL
1770 {
1771 .procname = "cad_pid",
1772 .data = NULL,
1773 .maxlen = sizeof (int),
1774 .mode = 0600,
1775 .proc_handler = proc_do_cad_pid,
1776 },
1777#endif
1778 {
1779 .procname = "threads-max",
1780 .data = NULL,
1781 .maxlen = sizeof(int),
1782 .mode = 0644,
1783 .proc_handler = sysctl_max_threads,
1784 },
1785 {
1786 .procname = "overflowuid",
1787 .data = &overflowuid,
1788 .maxlen = sizeof(int),
1789 .mode = 0644,
1790 .proc_handler = proc_dointvec_minmax,
1791 .extra1 = SYSCTL_ZERO,
1792 .extra2 = SYSCTL_MAXOLDUID,
1793 },
1794 {
1795 .procname = "overflowgid",
1796 .data = &overflowgid,
1797 .maxlen = sizeof(int),
1798 .mode = 0644,
1799 .proc_handler = proc_dointvec_minmax,
1800 .extra1 = SYSCTL_ZERO,
1801 .extra2 = SYSCTL_MAXOLDUID,
1802 },
1803#ifdef CONFIG_S390
1804 {
1805 .procname = "userprocess_debug",
1806 .data = &show_unhandled_signals,
1807 .maxlen = sizeof(int),
1808 .mode = 0644,
1809 .proc_handler = proc_dointvec,
1810 },
1811#endif
1812 {
1813 .procname = "pid_max",
1814 .data = &pid_max,
1815 .maxlen = sizeof (int),
1816 .mode = 0644,
1817 .proc_handler = proc_dointvec_minmax,
1818 .extra1 = &pid_max_min,
1819 .extra2 = &pid_max_max,
1820 },
1821 {
1822 .procname = "panic_on_oops",
1823 .data = &panic_on_oops,
1824 .maxlen = sizeof(int),
1825 .mode = 0644,
1826 .proc_handler = proc_dointvec,
1827 },
1828 {
1829 .procname = "panic_print",
1830 .data = &panic_print,
1831 .maxlen = sizeof(unsigned long),
1832 .mode = 0644,
1833 .proc_handler = proc_doulongvec_minmax,
1834 },
1835 {
1836 .procname = "ngroups_max",
1837 .data = (void *)&ngroups_max,
1838 .maxlen = sizeof (int),
1839 .mode = 0444,
1840 .proc_handler = proc_dointvec,
1841 },
1842 {
1843 .procname = "cap_last_cap",
1844 .data = (void *)&cap_last_cap,
1845 .maxlen = sizeof(int),
1846 .mode = 0444,
1847 .proc_handler = proc_dointvec,
1848 },
1849#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1850 {
1851 .procname = "unknown_nmi_panic",
1852 .data = &unknown_nmi_panic,
1853 .maxlen = sizeof (int),
1854 .mode = 0644,
1855 .proc_handler = proc_dointvec,
1856 },
1857#endif
1858
1859#if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
1860 defined(CONFIG_DEBUG_STACKOVERFLOW)
1861 {
1862 .procname = "panic_on_stackoverflow",
1863 .data = &sysctl_panic_on_stackoverflow,
1864 .maxlen = sizeof(int),
1865 .mode = 0644,
1866 .proc_handler = proc_dointvec,
1867 },
1868#endif
1869#if defined(CONFIG_X86)
1870 {
1871 .procname = "panic_on_unrecovered_nmi",
1872 .data = &panic_on_unrecovered_nmi,
1873 .maxlen = sizeof(int),
1874 .mode = 0644,
1875 .proc_handler = proc_dointvec,
1876 },
1877 {
1878 .procname = "panic_on_io_nmi",
1879 .data = &panic_on_io_nmi,
1880 .maxlen = sizeof(int),
1881 .mode = 0644,
1882 .proc_handler = proc_dointvec,
1883 },
1884 {
1885 .procname = "bootloader_type",
1886 .data = &bootloader_type,
1887 .maxlen = sizeof (int),
1888 .mode = 0444,
1889 .proc_handler = proc_dointvec,
1890 },
1891 {
1892 .procname = "bootloader_version",
1893 .data = &bootloader_version,
1894 .maxlen = sizeof (int),
1895 .mode = 0444,
1896 .proc_handler = proc_dointvec,
1897 },
1898 {
1899 .procname = "io_delay_type",
1900 .data = &io_delay_type,
1901 .maxlen = sizeof(int),
1902 .mode = 0644,
1903 .proc_handler = proc_dointvec,
1904 },
1905#endif
1906#if defined(CONFIG_MMU)
1907 {
1908 .procname = "randomize_va_space",
1909 .data = &randomize_va_space,
1910 .maxlen = sizeof(int),
1911 .mode = 0644,
1912 .proc_handler = proc_dointvec,
1913 },
1914#endif
1915#if defined(CONFIG_S390) && defined(CONFIG_SMP)
1916 {
1917 .procname = "spin_retry",
1918 .data = &spin_retry,
1919 .maxlen = sizeof (int),
1920 .mode = 0644,
1921 .proc_handler = proc_dointvec,
1922 },
1923#endif
1924#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1925 {
1926 .procname = "acpi_video_flags",
1927 .data = &acpi_realmode_flags,
1928 .maxlen = sizeof (unsigned long),
1929 .mode = 0644,
1930 .proc_handler = proc_doulongvec_minmax,
1931 },
1932#endif
1933#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1934 {
1935 .procname = "ignore-unaligned-usertrap",
1936 .data = &no_unaligned_warning,
1937 .maxlen = sizeof (int),
1938 .mode = 0644,
1939 .proc_handler = proc_dointvec,
1940 },
1941#endif
1942#ifdef CONFIG_RT_MUTEXES
1943 {
1944 .procname = "max_lock_depth",
1945 .data = &max_lock_depth,
1946 .maxlen = sizeof(int),
1947 .mode = 0644,
1948 .proc_handler = proc_dointvec,
1949 },
1950#endif
1951#ifdef CONFIG_PERF_EVENTS
1952 /*
1953 * User-space scripts rely on the existence of this file
1954 * as a feature check for perf_events being enabled.
1955 *
1956 * So it's an ABI, do not remove!
1957 */
1958 {
1959 .procname = "perf_event_paranoid",
1960 .data = &sysctl_perf_event_paranoid,
1961 .maxlen = sizeof(sysctl_perf_event_paranoid),
1962 .mode = 0644,
1963 .proc_handler = proc_dointvec,
1964 },
1965 {
1966 .procname = "perf_event_mlock_kb",
1967 .data = &sysctl_perf_event_mlock,
1968 .maxlen = sizeof(sysctl_perf_event_mlock),
1969 .mode = 0644,
1970 .proc_handler = proc_dointvec,
1971 },
1972 {
1973 .procname = "perf_event_max_sample_rate",
1974 .data = &sysctl_perf_event_sample_rate,
1975 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1976 .mode = 0644,
1977 .proc_handler = perf_event_max_sample_rate_handler,
1978 .extra1 = SYSCTL_ONE,
1979 },
1980 {
1981 .procname = "perf_cpu_time_max_percent",
1982 .data = &sysctl_perf_cpu_time_max_percent,
1983 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1984 .mode = 0644,
1985 .proc_handler = perf_cpu_time_max_percent_handler,
1986 .extra1 = SYSCTL_ZERO,
1987 .extra2 = SYSCTL_ONE_HUNDRED,
1988 },
1989 {
1990 .procname = "perf_event_max_stack",
1991 .data = &sysctl_perf_event_max_stack,
1992 .maxlen = sizeof(sysctl_perf_event_max_stack),
1993 .mode = 0644,
1994 .proc_handler = perf_event_max_stack_handler,
1995 .extra1 = SYSCTL_ZERO,
1996 .extra2 = (void *)&six_hundred_forty_kb,
1997 },
1998 {
1999 .procname = "perf_event_max_contexts_per_stack",
2000 .data = &sysctl_perf_event_max_contexts_per_stack,
2001 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
2002 .mode = 0644,
2003 .proc_handler = perf_event_max_stack_handler,
2004 .extra1 = SYSCTL_ZERO,
2005 .extra2 = SYSCTL_ONE_THOUSAND,
2006 },
2007#endif
2008 {
2009 .procname = "panic_on_warn",
2010 .data = &panic_on_warn,
2011 .maxlen = sizeof(int),
2012 .mode = 0644,
2013 .proc_handler = proc_dointvec_minmax,
2014 .extra1 = SYSCTL_ZERO,
2015 .extra2 = SYSCTL_ONE,
2016 },
2017#ifdef CONFIG_TREE_RCU
2018 {
2019 .procname = "panic_on_rcu_stall",
2020 .data = &sysctl_panic_on_rcu_stall,
2021 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
2022 .mode = 0644,
2023 .proc_handler = proc_dointvec_minmax,
2024 .extra1 = SYSCTL_ZERO,
2025 .extra2 = SYSCTL_ONE,
2026 },
2027 {
2028 .procname = "max_rcu_stall_to_panic",
2029 .data = &sysctl_max_rcu_stall_to_panic,
2030 .maxlen = sizeof(sysctl_max_rcu_stall_to_panic),
2031 .mode = 0644,
2032 .proc_handler = proc_dointvec_minmax,
2033 .extra1 = SYSCTL_ONE,
2034 .extra2 = SYSCTL_INT_MAX,
2035 },
2036#endif
2037 { }
2038};
2039
2040static struct ctl_table vm_table[] = {
2041 {
2042 .procname = "overcommit_memory",
2043 .data = &sysctl_overcommit_memory,
2044 .maxlen = sizeof(sysctl_overcommit_memory),
2045 .mode = 0644,
2046 .proc_handler = overcommit_policy_handler,
2047 .extra1 = SYSCTL_ZERO,
2048 .extra2 = SYSCTL_TWO,
2049 },
2050 {
2051 .procname = "overcommit_ratio",
2052 .data = &sysctl_overcommit_ratio,
2053 .maxlen = sizeof(sysctl_overcommit_ratio),
2054 .mode = 0644,
2055 .proc_handler = overcommit_ratio_handler,
2056 },
2057 {
2058 .procname = "overcommit_kbytes",
2059 .data = &sysctl_overcommit_kbytes,
2060 .maxlen = sizeof(sysctl_overcommit_kbytes),
2061 .mode = 0644,
2062 .proc_handler = overcommit_kbytes_handler,
2063 },
2064 {
2065 .procname = "page-cluster",
2066 .data = &page_cluster,
2067 .maxlen = sizeof(int),
2068 .mode = 0644,
2069 .proc_handler = proc_dointvec_minmax,
2070 .extra1 = SYSCTL_ZERO,
2071 .extra2 = (void *)&page_cluster_max,
2072 },
2073 {
2074 .procname = "dirtytime_expire_seconds",
2075 .data = &dirtytime_expire_interval,
2076 .maxlen = sizeof(dirtytime_expire_interval),
2077 .mode = 0644,
2078 .proc_handler = dirtytime_interval_handler,
2079 .extra1 = SYSCTL_ZERO,
2080 },
2081 {
2082 .procname = "swappiness",
2083 .data = &vm_swappiness,
2084 .maxlen = sizeof(vm_swappiness),
2085 .mode = 0644,
2086 .proc_handler = proc_dointvec_minmax,
2087 .extra1 = SYSCTL_ZERO,
2088 .extra2 = SYSCTL_TWO_HUNDRED,
2089 },
2090#ifdef CONFIG_NUMA
2091 {
2092 .procname = "numa_stat",
2093 .data = &sysctl_vm_numa_stat,
2094 .maxlen = sizeof(int),
2095 .mode = 0644,
2096 .proc_handler = sysctl_vm_numa_stat_handler,
2097 .extra1 = SYSCTL_ZERO,
2098 .extra2 = SYSCTL_ONE,
2099 },
2100#endif
2101 {
2102 .procname = "drop_caches",
2103 .data = &sysctl_drop_caches,
2104 .maxlen = sizeof(int),
2105 .mode = 0200,
2106 .proc_handler = drop_caches_sysctl_handler,
2107 .extra1 = SYSCTL_ONE,
2108 .extra2 = SYSCTL_FOUR,
2109 },
2110 {
2111 .procname = "page_lock_unfairness",
2112 .data = &sysctl_page_lock_unfairness,
2113 .maxlen = sizeof(sysctl_page_lock_unfairness),
2114 .mode = 0644,
2115 .proc_handler = proc_dointvec_minmax,
2116 .extra1 = SYSCTL_ZERO,
2117 },
2118#ifdef CONFIG_MMU
2119 {
2120 .procname = "max_map_count",
2121 .data = &sysctl_max_map_count,
2122 .maxlen = sizeof(sysctl_max_map_count),
2123 .mode = 0644,
2124 .proc_handler = proc_dointvec_minmax,
2125 .extra1 = SYSCTL_ZERO,
2126 },
2127#else
2128 {
2129 .procname = "nr_trim_pages",
2130 .data = &sysctl_nr_trim_pages,
2131 .maxlen = sizeof(sysctl_nr_trim_pages),
2132 .mode = 0644,
2133 .proc_handler = proc_dointvec_minmax,
2134 .extra1 = SYSCTL_ZERO,
2135 },
2136#endif
2137 {
2138 .procname = "vfs_cache_pressure",
2139 .data = &sysctl_vfs_cache_pressure,
2140 .maxlen = sizeof(sysctl_vfs_cache_pressure),
2141 .mode = 0644,
2142 .proc_handler = proc_dointvec_minmax,
2143 .extra1 = SYSCTL_ZERO,
2144 },
2145#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2146 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2147 {
2148 .procname = "legacy_va_layout",
2149 .data = &sysctl_legacy_va_layout,
2150 .maxlen = sizeof(sysctl_legacy_va_layout),
2151 .mode = 0644,
2152 .proc_handler = proc_dointvec_minmax,
2153 .extra1 = SYSCTL_ZERO,
2154 },
2155#endif
2156#ifdef CONFIG_NUMA
2157 {
2158 .procname = "zone_reclaim_mode",
2159 .data = &node_reclaim_mode,
2160 .maxlen = sizeof(node_reclaim_mode),
2161 .mode = 0644,
2162 .proc_handler = proc_dointvec_minmax,
2163 .extra1 = SYSCTL_ZERO,
2164 },
2165#endif
2166#ifdef CONFIG_SMP
2167 {
2168 .procname = "stat_interval",
2169 .data = &sysctl_stat_interval,
2170 .maxlen = sizeof(sysctl_stat_interval),
2171 .mode = 0644,
2172 .proc_handler = proc_dointvec_jiffies,
2173 },
2174 {
2175 .procname = "stat_refresh",
2176 .data = NULL,
2177 .maxlen = 0,
2178 .mode = 0600,
2179 .proc_handler = vmstat_refresh,
2180 },
2181#endif
2182#ifdef CONFIG_MMU
2183 {
2184 .procname = "mmap_min_addr",
2185 .data = &dac_mmap_min_addr,
2186 .maxlen = sizeof(unsigned long),
2187 .mode = 0644,
2188 .proc_handler = mmap_min_addr_handler,
2189 },
2190#endif
2191#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
2192 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
2193 {
2194 .procname = "vdso_enabled",
2195#ifdef CONFIG_X86_32
2196 .data = &vdso32_enabled,
2197 .maxlen = sizeof(vdso32_enabled),
2198#else
2199 .data = &vdso_enabled,
2200 .maxlen = sizeof(vdso_enabled),
2201#endif
2202 .mode = 0644,
2203 .proc_handler = proc_dointvec,
2204 .extra1 = SYSCTL_ZERO,
2205 },
2206#endif
2207 {
2208 .procname = "user_reserve_kbytes",
2209 .data = &sysctl_user_reserve_kbytes,
2210 .maxlen = sizeof(sysctl_user_reserve_kbytes),
2211 .mode = 0644,
2212 .proc_handler = proc_doulongvec_minmax,
2213 },
2214 {
2215 .procname = "admin_reserve_kbytes",
2216 .data = &sysctl_admin_reserve_kbytes,
2217 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
2218 .mode = 0644,
2219 .proc_handler = proc_doulongvec_minmax,
2220 },
2221#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
2222 {
2223 .procname = "mmap_rnd_bits",
2224 .data = &mmap_rnd_bits,
2225 .maxlen = sizeof(mmap_rnd_bits),
2226 .mode = 0600,
2227 .proc_handler = proc_dointvec_minmax,
2228 .extra1 = (void *)&mmap_rnd_bits_min,
2229 .extra2 = (void *)&mmap_rnd_bits_max,
2230 },
2231#endif
2232#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
2233 {
2234 .procname = "mmap_rnd_compat_bits",
2235 .data = &mmap_rnd_compat_bits,
2236 .maxlen = sizeof(mmap_rnd_compat_bits),
2237 .mode = 0600,
2238 .proc_handler = proc_dointvec_minmax,
2239 .extra1 = (void *)&mmap_rnd_compat_bits_min,
2240 .extra2 = (void *)&mmap_rnd_compat_bits_max,
2241 },
2242#endif
2243 { }
2244};
2245
2246int __init sysctl_init_bases(void)
2247{
2248 register_sysctl_init("kernel", kern_table);
2249 register_sysctl_init("vm", vm_table);
2250
2251 return 0;
2252}
2253#endif /* CONFIG_SYSCTL */
2254/*
2255 * No sense putting this after each symbol definition, twice,
2256 * exception granted :-)
2257 */
2258EXPORT_SYMBOL(proc_dobool);
2259EXPORT_SYMBOL(proc_dointvec);
2260EXPORT_SYMBOL(proc_douintvec);
2261EXPORT_SYMBOL(proc_dointvec_jiffies);
2262EXPORT_SYMBOL(proc_dointvec_minmax);
2263EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
2264EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2265EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2266EXPORT_SYMBOL(proc_dostring);
2267EXPORT_SYMBOL(proc_doulongvec_minmax);
2268EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2269EXPORT_SYMBOL(proc_do_large_bitmap);