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21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
26#include <linux/bitmap.h>
27#include <linux/signal.h>
28#include <linux/printk.h>
29#include <linux/proc_fs.h>
30#include <linux/security.h>
31#include <linux/ctype.h>
32#include <linux/kmemcheck.h>
33#include <linux/kmemleak.h>
34#include <linux/fs.h>
35#include <linux/init.h>
36#include <linux/kernel.h>
37#include <linux/kobject.h>
38#include <linux/net.h>
39#include <linux/sysrq.h>
40#include <linux/highuid.h>
41#include <linux/writeback.h>
42#include <linux/ratelimit.h>
43#include <linux/compaction.h>
44#include <linux/hugetlb.h>
45#include <linux/initrd.h>
46#include <linux/key.h>
47#include <linux/times.h>
48#include <linux/limits.h>
49#include <linux/dcache.h>
50#include <linux/dnotify.h>
51#include <linux/syscalls.h>
52#include <linux/vmstat.h>
53#include <linux/nfs_fs.h>
54#include <linux/acpi.h>
55#include <linux/reboot.h>
56#include <linux/ftrace.h>
57#include <linux/perf_event.h>
58#include <linux/kprobes.h>
59#include <linux/pipe_fs_i.h>
60#include <linux/oom.h>
61#include <linux/kmod.h>
62#include <linux/capability.h>
63#include <linux/binfmts.h>
64#include <linux/sched/sysctl.h>
65#include <linux/kexec.h>
66#include <linux/mount.h>
67
68#include <asm/uaccess.h>
69#include <asm/processor.h>
70
71#ifdef CONFIG_X86
72#include <asm/nmi.h>
73#include <asm/stacktrace.h>
74#include <asm/io.h>
75#endif
76#ifdef CONFIG_SPARC
77#include <asm/setup.h>
78#endif
79#ifdef CONFIG_BSD_PROCESS_ACCT
80#include <linux/acct.h>
81#endif
82#ifdef CONFIG_RT_MUTEXES
83#include <linux/rtmutex.h>
84#endif
85#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
86#include <linux/lockdep.h>
87#endif
88#ifdef CONFIG_CHR_DEV_SG
89#include <scsi/sg.h>
90#endif
91
92#ifdef CONFIG_LOCKUP_DETECTOR
93#include <linux/nmi.h>
94#endif
95
96
97#if defined(CONFIG_SYSCTL)
98
99
100extern int may_detach_mounts;
101extern int max_threads;
102extern int suid_dumpable;
103#ifdef CONFIG_COREDUMP
104extern int core_uses_pid;
105extern char core_pattern[];
106extern unsigned int core_pipe_limit;
107#endif
108extern int pid_max;
109extern int pid_max_min, pid_max_max;
110extern int percpu_pagelist_fraction;
111extern int compat_log;
112extern int latencytop_enabled;
113extern int sysctl_nr_open_min, sysctl_nr_open_max;
114#ifndef CONFIG_MMU
115extern int sysctl_nr_trim_pages;
116#endif
117
118
119#ifdef CONFIG_LOCKUP_DETECTOR
120static int sixty = 60;
121#endif
122
123static int __maybe_unused neg_one = -1;
124static int zero;
125static int __maybe_unused one = 1;
126static int __maybe_unused two = 2;
127static int __maybe_unused four = 4;
128static unsigned long one_ul = 1;
129static int one_hundred = 100;
130#ifdef CONFIG_PRINTK
131static int ten_thousand = 10000;
132#endif
133
134
135static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136
137
138static int maxolduid = 65535;
139static int minolduid;
140
141static int ngroups_max = NGROUPS_MAX;
142static const int cap_last_cap = CAP_LAST_CAP;
143
144
145#ifdef CONFIG_DETECT_HUNG_TASK
146static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
147#endif
148
149#ifdef CONFIG_INOTIFY_USER
150#include <linux/inotify.h>
151#endif
152#ifdef CONFIG_SPARC
153#endif
154
155#ifdef CONFIG_SPARC64
156extern int sysctl_tsb_ratio;
157#endif
158
159#ifdef __hppa__
160extern int pwrsw_enabled;
161#endif
162
163#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164extern int unaligned_enabled;
165#endif
166
167#ifdef CONFIG_IA64
168extern int unaligned_dump_stack;
169#endif
170
171#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172extern int no_unaligned_warning;
173#endif
174
175#ifdef CONFIG_PROC_SYSCTL
176
177
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194
195
196enum sysctl_writes_mode {
197 SYSCTL_WRITES_LEGACY = -1,
198 SYSCTL_WRITES_WARN = 0,
199 SYSCTL_WRITES_STRICT = 1,
200};
201
202static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
203
204static int proc_do_cad_pid(struct ctl_table *table, int write,
205 void __user *buffer, size_t *lenp, loff_t *ppos);
206static int proc_taint(struct ctl_table *table, int write,
207 void __user *buffer, size_t *lenp, loff_t *ppos);
208#endif
209
210#ifdef CONFIG_PRINTK
211static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
212 void __user *buffer, size_t *lenp, loff_t *ppos);
213#endif
214
215static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
216 void __user *buffer, size_t *lenp, loff_t *ppos);
217#ifdef CONFIG_COREDUMP
218static int proc_dostring_coredump(struct ctl_table *table, int write,
219 void __user *buffer, size_t *lenp, loff_t *ppos);
220#endif
221
222#ifdef CONFIG_MAGIC_SYSRQ
223
224static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
225
226static int sysrq_sysctl_handler(ctl_table *table, int write,
227 void __user *buffer, size_t *lenp,
228 loff_t *ppos)
229{
230 int error;
231
232 error = proc_dointvec(table, write, buffer, lenp, ppos);
233 if (error)
234 return error;
235
236 if (write)
237 sysrq_toggle_support(__sysrq_enabled);
238
239 return 0;
240}
241
242#endif
243
244static struct ctl_table kern_table[];
245static struct ctl_table vm_table[];
246static struct ctl_table fs_table[];
247static struct ctl_table debug_table[];
248static struct ctl_table dev_table[];
249extern struct ctl_table random_table[];
250#ifdef CONFIG_EPOLL
251extern struct ctl_table epoll_table[];
252#endif
253
254#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
255int sysctl_legacy_va_layout;
256#endif
257
258
259
260static struct ctl_table sysctl_base_table[] = {
261 {
262 .procname = "kernel",
263 .mode = 0555,
264 .child = kern_table,
265 },
266 {
267 .procname = "vm",
268 .mode = 0555,
269 .child = vm_table,
270 },
271 {
272 .procname = "fs",
273 .mode = 0555,
274 .child = fs_table,
275 },
276 {
277 .procname = "debug",
278 .mode = 0555,
279 .child = debug_table,
280 },
281 {
282 .procname = "dev",
283 .mode = 0555,
284 .child = dev_table,
285 },
286 { }
287};
288
289#ifdef CONFIG_SCHED_DEBUG
290static int min_sched_granularity_ns = 100000;
291static int max_sched_granularity_ns = NSEC_PER_SEC;
292static int min_wakeup_granularity_ns;
293static int max_wakeup_granularity_ns = NSEC_PER_SEC;
294#ifdef CONFIG_SMP
295static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
296static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
297#endif
298#endif
299
300#ifdef CONFIG_COMPACTION
301static int min_extfrag_threshold;
302static int max_extfrag_threshold = 1000;
303#endif
304
305static struct ctl_table kern_table[] = {
306 {
307 .procname = "sched_child_runs_first",
308 .data = &sysctl_sched_child_runs_first,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
311 .proc_handler = proc_dointvec,
312 },
313#ifdef CONFIG_SCHED_DEBUG
314 {
315 .procname = "sched_min_granularity_ns",
316 .data = &sysctl_sched_min_granularity,
317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
319 .proc_handler = sched_proc_update_handler,
320 .extra1 = &min_sched_granularity_ns,
321 .extra2 = &max_sched_granularity_ns,
322 },
323 {
324 .procname = "sched_latency_ns",
325 .data = &sysctl_sched_latency,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = sched_proc_update_handler,
329 .extra1 = &min_sched_granularity_ns,
330 .extra2 = &max_sched_granularity_ns,
331 },
332 {
333 .procname = "sched_wakeup_granularity_ns",
334 .data = &sysctl_sched_wakeup_granularity,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
337 .proc_handler = sched_proc_update_handler,
338 .extra1 = &min_wakeup_granularity_ns,
339 .extra2 = &max_wakeup_granularity_ns,
340 },
341#ifdef CONFIG_SMP
342 {
343 .procname = "sched_tunable_scaling",
344 .data = &sysctl_sched_tunable_scaling,
345 .maxlen = sizeof(enum sched_tunable_scaling),
346 .mode = 0644,
347 .proc_handler = sched_proc_update_handler,
348 .extra1 = &min_sched_tunable_scaling,
349 .extra2 = &max_sched_tunable_scaling,
350 },
351 {
352 .procname = "sched_migration_cost_ns",
353 .data = &sysctl_sched_migration_cost,
354 .maxlen = sizeof(unsigned int),
355 .mode = 0644,
356 .proc_handler = proc_dointvec,
357 },
358 {
359 .procname = "sched_nr_migrate",
360 .data = &sysctl_sched_nr_migrate,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = proc_dointvec,
364 },
365 {
366 .procname = "sched_time_avg_ms",
367 .data = &sysctl_sched_time_avg,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
370 .proc_handler = proc_dointvec,
371 },
372 {
373 .procname = "sched_shares_window_ns",
374 .data = &sysctl_sched_shares_window,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec,
378 },
379 {
380 .procname = "timer_migration",
381 .data = &sysctl_timer_migration,
382 .maxlen = sizeof(unsigned int),
383 .mode = 0644,
384 .proc_handler = proc_dointvec_minmax,
385 .extra1 = &zero,
386 .extra2 = &one,
387 },
388#ifdef CONFIG_SCHEDSTATS
389 {
390 .procname = "sched_schedstats",
391 .data = NULL,
392 .maxlen = sizeof(unsigned int),
393 .mode = 0644,
394 .proc_handler = sysctl_schedstats,
395 .extra1 = &zero,
396 .extra2 = &one,
397 },
398#endif
399#endif
400#ifdef CONFIG_NUMA_BALANCING
401 {
402 .procname = "numa_balancing_scan_delay_ms",
403 .data = &sysctl_numa_balancing_scan_delay,
404 .maxlen = sizeof(unsigned int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec,
407 },
408 {
409 .procname = "numa_balancing_scan_period_min_ms",
410 .data = &sysctl_numa_balancing_scan_period_min,
411 .maxlen = sizeof(unsigned int),
412 .mode = 0644,
413 .proc_handler = proc_dointvec,
414 },
415 {
416 .procname = "numa_balancing_scan_period_max_ms",
417 .data = &sysctl_numa_balancing_scan_period_max,
418 .maxlen = sizeof(unsigned int),
419 .mode = 0644,
420 .proc_handler = proc_dointvec,
421 },
422 {
423 .procname = "numa_balancing_scan_size_mb",
424 .data = &sysctl_numa_balancing_scan_size,
425 .maxlen = sizeof(unsigned int),
426 .mode = 0644,
427 .proc_handler = proc_dointvec_minmax,
428 .extra1 = &one,
429 },
430 {
431 .procname = "numa_balancing_settle_count",
432 .data = &sysctl_numa_balancing_settle_count,
433 .maxlen = sizeof(unsigned int),
434 .mode = 0644,
435 .proc_handler = proc_dointvec,
436 },
437 {
438 .procname = "numa_balancing",
439 .data = NULL,
440 .maxlen = sizeof(unsigned int),
441 .mode = 0644,
442 .proc_handler = sysctl_numa_balancing,
443 .extra1 = &zero,
444 .extra2 = &one,
445 },
446#endif
447#endif
448 {
449 .procname = "sched_rt_period_us",
450 .data = &sysctl_sched_rt_period,
451 .maxlen = sizeof(unsigned int),
452 .mode = 0644,
453 .proc_handler = sched_rt_handler,
454 },
455 {
456 .procname = "sched_rt_runtime_us",
457 .data = &sysctl_sched_rt_runtime,
458 .maxlen = sizeof(int),
459 .mode = 0644,
460 .proc_handler = sched_rt_handler,
461 },
462 {
463 .procname = "sched_rr_timeslice_ms",
464 .data = &sched_rr_timeslice,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = sched_rr_handler,
468 },
469#ifdef CONFIG_SCHED_AUTOGROUP
470 {
471 .procname = "sched_autogroup_enabled",
472 .data = &sysctl_sched_autogroup_enabled,
473 .maxlen = sizeof(unsigned int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec_minmax,
476 .extra1 = &zero,
477 .extra2 = &one,
478 },
479#endif
480#ifdef CONFIG_CFS_BANDWIDTH
481 {
482 .procname = "sched_cfs_bandwidth_slice_us",
483 .data = &sysctl_sched_cfs_bandwidth_slice,
484 .maxlen = sizeof(unsigned int),
485 .mode = 0644,
486 .proc_handler = proc_dointvec_minmax,
487 .extra1 = &one,
488 },
489#endif
490#ifdef CONFIG_PROVE_LOCKING
491 {
492 .procname = "prove_locking",
493 .data = &prove_locking,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec,
497 },
498#endif
499#ifdef CONFIG_LOCK_STAT
500 {
501 .procname = "lock_stat",
502 .data = &lock_stat,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507#endif
508 {
509 .procname = "panic",
510 .data = &panic_timeout,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = proc_dointvec,
514 },
515#ifdef CONFIG_COREDUMP
516 {
517 .procname = "core_uses_pid",
518 .data = &core_uses_pid,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = proc_dointvec,
522 },
523 {
524 .procname = "core_pattern",
525 .data = core_pattern,
526 .maxlen = CORENAME_MAX_SIZE,
527 .mode = 0644,
528 .proc_handler = proc_dostring_coredump,
529 },
530 {
531 .procname = "core_pipe_limit",
532 .data = &core_pipe_limit,
533 .maxlen = sizeof(unsigned int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec,
536 },
537#endif
538#ifdef CONFIG_PROC_SYSCTL
539 {
540 .procname = "tainted",
541 .maxlen = sizeof(long),
542 .mode = 0644,
543 .proc_handler = proc_taint,
544 },
545 {
546 .procname = "sysctl_writes_strict",
547 .data = &sysctl_writes_strict,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 .proc_handler = proc_dointvec_minmax,
551 .extra1 = &neg_one,
552 .extra2 = &one,
553 },
554#endif
555#ifdef CONFIG_LATENCYTOP
556 {
557 .procname = "latencytop",
558 .data = &latencytop_enabled,
559 .maxlen = sizeof(int),
560 .mode = 0644,
561 .proc_handler = sysctl_latencytop,
562 },
563#endif
564#ifdef CONFIG_BLK_DEV_INITRD
565 {
566 .procname = "real-root-dev",
567 .data = &real_root_dev,
568 .maxlen = sizeof(int),
569 .mode = 0644,
570 .proc_handler = proc_dointvec,
571 },
572#endif
573 {
574 .procname = "print-fatal-signals",
575 .data = &print_fatal_signals,
576 .maxlen = sizeof(int),
577 .mode = 0644,
578 .proc_handler = proc_dointvec,
579 },
580#ifdef CONFIG_SPARC
581 {
582 .procname = "reboot-cmd",
583 .data = reboot_command,
584 .maxlen = 256,
585 .mode = 0644,
586 .proc_handler = proc_dostring,
587 },
588 {
589 .procname = "stop-a",
590 .data = &stop_a_enabled,
591 .maxlen = sizeof (int),
592 .mode = 0644,
593 .proc_handler = proc_dointvec,
594 },
595 {
596 .procname = "scons-poweroff",
597 .data = &scons_pwroff,
598 .maxlen = sizeof (int),
599 .mode = 0644,
600 .proc_handler = proc_dointvec,
601 },
602#endif
603#ifdef CONFIG_SPARC64
604 {
605 .procname = "tsb-ratio",
606 .data = &sysctl_tsb_ratio,
607 .maxlen = sizeof (int),
608 .mode = 0644,
609 .proc_handler = proc_dointvec,
610 },
611#endif
612#ifdef __hppa__
613 {
614 .procname = "soft-power",
615 .data = &pwrsw_enabled,
616 .maxlen = sizeof (int),
617 .mode = 0644,
618 .proc_handler = proc_dointvec,
619 },
620#endif
621#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
622 {
623 .procname = "unaligned-trap",
624 .data = &unaligned_enabled,
625 .maxlen = sizeof (int),
626 .mode = 0644,
627 .proc_handler = proc_dointvec,
628 },
629#endif
630 {
631 .procname = "ctrl-alt-del",
632 .data = &C_A_D,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 .proc_handler = proc_dointvec,
636 },
637#ifdef CONFIG_FUNCTION_TRACER
638 {
639 .procname = "ftrace_enabled",
640 .data = &ftrace_enabled,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = ftrace_enable_sysctl,
644 },
645#endif
646#ifdef CONFIG_STACK_TRACER
647 {
648 .procname = "stack_tracer_enabled",
649 .data = &stack_tracer_enabled,
650 .maxlen = sizeof(int),
651 .mode = 0644,
652 .proc_handler = stack_trace_sysctl,
653 },
654#endif
655#ifdef CONFIG_TRACING
656 {
657 .procname = "ftrace_dump_on_oops",
658 .data = &ftrace_dump_on_oops,
659 .maxlen = sizeof(int),
660 .mode = 0644,
661 .proc_handler = proc_dointvec,
662 },
663 {
664 .procname = "traceoff_on_warning",
665 .data = &__disable_trace_on_warning,
666 .maxlen = sizeof(__disable_trace_on_warning),
667 .mode = 0644,
668 .proc_handler = proc_dointvec,
669 },
670#endif
671#ifdef CONFIG_KEXEC_CORE
672 {
673 .procname = "kexec_load_disabled",
674 .data = &kexec_load_disabled,
675 .maxlen = sizeof(int),
676 .mode = 0644,
677
678 .proc_handler = proc_dointvec_minmax,
679 .extra1 = &one,
680 .extra2 = &one,
681 },
682#endif
683#ifdef CONFIG_MODULES
684 {
685 .procname = "modprobe",
686 .data = &modprobe_path,
687 .maxlen = KMOD_PATH_LEN,
688 .mode = 0644,
689 .proc_handler = proc_dostring,
690 },
691 {
692 .procname = "modules_disabled",
693 .data = &modules_disabled,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = &one,
699 .extra2 = &one,
700 },
701#endif
702
703 {
704 .procname = "hotplug",
705 .data = &uevent_helper,
706 .maxlen = UEVENT_HELPER_PATH_LEN,
707 .mode = 0644,
708 .proc_handler = proc_dostring,
709 },
710
711#ifdef CONFIG_CHR_DEV_SG
712 {
713 .procname = "sg-big-buff",
714 .data = &sg_big_buff,
715 .maxlen = sizeof (int),
716 .mode = 0444,
717 .proc_handler = proc_dointvec,
718 },
719#endif
720#ifdef CONFIG_BSD_PROCESS_ACCT
721 {
722 .procname = "acct",
723 .data = &acct_parm,
724 .maxlen = 3*sizeof(int),
725 .mode = 0644,
726 .proc_handler = proc_dointvec,
727 },
728#endif
729#ifdef CONFIG_MAGIC_SYSRQ
730 {
731 .procname = "sysrq",
732 .data = &__sysrq_enabled,
733 .maxlen = sizeof (int),
734 .mode = 0644,
735 .proc_handler = sysrq_sysctl_handler,
736 },
737#endif
738#ifdef CONFIG_PROC_SYSCTL
739 {
740 .procname = "cad_pid",
741 .data = NULL,
742 .maxlen = sizeof (int),
743 .mode = 0600,
744 .proc_handler = proc_do_cad_pid,
745 },
746#endif
747 {
748 .procname = "threads-max",
749 .data = &max_threads,
750 .maxlen = sizeof(int),
751 .mode = 0644,
752 .proc_handler = proc_dointvec,
753 },
754 {
755 .procname = "random",
756 .mode = 0555,
757 .child = random_table,
758 },
759 {
760 .procname = "usermodehelper",
761 .mode = 0555,
762 .child = usermodehelper_table,
763 },
764 {
765 .procname = "overflowuid",
766 .data = &overflowuid,
767 .maxlen = sizeof(int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec_minmax,
770 .extra1 = &minolduid,
771 .extra2 = &maxolduid,
772 },
773 {
774 .procname = "overflowgid",
775 .data = &overflowgid,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec_minmax,
779 .extra1 = &minolduid,
780 .extra2 = &maxolduid,
781 },
782#ifdef CONFIG_S390
783#ifdef CONFIG_MATHEMU
784 {
785 .procname = "ieee_emulation_warnings",
786 .data = &sysctl_ieee_emulation_warnings,
787 .maxlen = sizeof(int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec,
790 },
791#endif
792 {
793 .procname = "userprocess_debug",
794 .data = &show_unhandled_signals,
795 .maxlen = sizeof(int),
796 .mode = 0644,
797 .proc_handler = proc_dointvec,
798 },
799#endif
800 {
801 .procname = "pid_max",
802 .data = &pid_max,
803 .maxlen = sizeof (int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec_minmax,
806 .extra1 = &pid_max_min,
807 .extra2 = &pid_max_max,
808 },
809 {
810 .procname = "panic_on_oops",
811 .data = &panic_on_oops,
812 .maxlen = sizeof(int),
813 .mode = 0644,
814 .proc_handler = proc_dointvec,
815 },
816#if defined CONFIG_PRINTK
817 {
818 .procname = "printk",
819 .data = &console_loglevel,
820 .maxlen = 4*sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dointvec,
823 },
824 {
825 .procname = "printk_ratelimit",
826 .data = &printk_ratelimit_state.interval,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec_jiffies,
830 },
831 {
832 .procname = "printk_ratelimit_burst",
833 .data = &printk_ratelimit_state.burst,
834 .maxlen = sizeof(int),
835 .mode = 0644,
836 .proc_handler = proc_dointvec,
837 },
838 {
839 .procname = "printk_delay",
840 .data = &printk_delay_msec,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = proc_dointvec_minmax,
844 .extra1 = &zero,
845 .extra2 = &ten_thousand,
846 },
847 {
848 .procname = "dmesg_restrict",
849 .data = &dmesg_restrict,
850 .maxlen = sizeof(int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec_minmax_sysadmin,
853 .extra1 = &zero,
854 .extra2 = &one,
855 },
856 {
857 .procname = "kptr_restrict",
858 .data = &kptr_restrict,
859 .maxlen = sizeof(int),
860 .mode = 0644,
861 .proc_handler = proc_dointvec_minmax_sysadmin,
862 .extra1 = &zero,
863 .extra2 = &two,
864 },
865#endif
866 {
867 .procname = "ngroups_max",
868 .data = &ngroups_max,
869 .maxlen = sizeof (int),
870 .mode = 0444,
871 .proc_handler = proc_dointvec,
872 },
873 {
874 .procname = "cap_last_cap",
875 .data = (void *)&cap_last_cap,
876 .maxlen = sizeof(int),
877 .mode = 0444,
878 .proc_handler = proc_dointvec,
879 },
880#if defined(CONFIG_LOCKUP_DETECTOR)
881 {
882 .procname = "watchdog",
883 .data = &watchdog_user_enabled,
884 .maxlen = sizeof (int),
885 .mode = 0644,
886 .proc_handler = proc_watchdog,
887 .extra1 = &zero,
888 .extra2 = &one,
889 },
890 {
891 .procname = "watchdog_thresh",
892 .data = &watchdog_thresh,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_watchdog_thresh,
896 .extra1 = &zero,
897 .extra2 = &sixty,
898 },
899 {
900 .procname = "nmi_watchdog",
901 .data = &nmi_watchdog_enabled,
902 .maxlen = sizeof (int),
903 .mode = 0644,
904 .proc_handler = proc_nmi_watchdog,
905 .extra1 = &zero,
906#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
907 .extra2 = &one,
908#else
909 .extra2 = &zero,
910#endif
911 },
912#if 0
913 {
914 .procname = "soft_watchdog",
915 .data = &soft_watchdog_enabled,
916 .maxlen = sizeof (int),
917 .mode = 0644,
918 .proc_handler = proc_soft_watchdog,
919 .extra1 = &zero,
920 .extra2 = &one,
921 },
922#endif
923 {
924 .procname = "watchdog_cpumask",
925 .data = cpumask_bits(&watchdog_cpumask),
926 .maxlen = NR_CPUS,
927 .mode = 0644,
928 .proc_handler = proc_watchdog_cpumask,
929 },
930 {
931 .procname = "softlockup_panic",
932 .data = &softlockup_panic,
933 .maxlen = sizeof(int),
934 .mode = 0644,
935 .proc_handler = proc_dointvec_minmax,
936 .extra1 = &zero,
937 .extra2 = &one,
938 },
939#ifdef CONFIG_HARDLOCKUP_DETECTOR
940 {
941 .procname = "hardlockup_panic",
942 .data = &hardlockup_panic,
943 .maxlen = sizeof(int),
944 .mode = 0644,
945 .proc_handler = proc_dointvec_minmax,
946 .extra1 = &zero,
947 .extra2 = &one,
948 },
949#endif
950#ifdef CONFIG_SMP
951 {
952 .procname = "softlockup_all_cpu_backtrace",
953 .data = &sysctl_softlockup_all_cpu_backtrace,
954 .maxlen = sizeof(int),
955 .mode = 0644,
956 .proc_handler = proc_dointvec_minmax,
957 .extra1 = &zero,
958 .extra2 = &one,
959 },
960 {
961 .procname = "hardlockup_all_cpu_backtrace",
962 .data = &sysctl_hardlockup_all_cpu_backtrace,
963 .maxlen = sizeof(int),
964 .mode = 0644,
965 .proc_handler = proc_dointvec_minmax,
966 .extra1 = &zero,
967 .extra2 = &one,
968 },
969#endif
970#endif
971#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
972 {
973 .procname = "unknown_nmi_panic",
974 .data = &unknown_nmi_panic,
975 .maxlen = sizeof (int),
976 .mode = 0644,
977 .proc_handler = proc_dointvec,
978 },
979#endif
980#if defined(CONFIG_X86)
981 {
982 .procname = "panic_on_unrecovered_nmi",
983 .data = &panic_on_unrecovered_nmi,
984 .maxlen = sizeof(int),
985 .mode = 0644,
986 .proc_handler = proc_dointvec,
987 },
988 {
989 .procname = "panic_on_io_nmi",
990 .data = &panic_on_io_nmi,
991 .maxlen = sizeof(int),
992 .mode = 0644,
993 .proc_handler = proc_dointvec,
994 },
995#ifdef CONFIG_DEBUG_STACKOVERFLOW
996 {
997 .procname = "panic_on_stackoverflow",
998 .data = &sysctl_panic_on_stackoverflow,
999 .maxlen = sizeof(int),
1000 .mode = 0644,
1001 .proc_handler = proc_dointvec,
1002 },
1003#endif
1004 {
1005 .procname = "bootloader_type",
1006 .data = &bootloader_type,
1007 .maxlen = sizeof (int),
1008 .mode = 0444,
1009 .proc_handler = proc_dointvec,
1010 },
1011 {
1012 .procname = "bootloader_version",
1013 .data = &bootloader_version,
1014 .maxlen = sizeof (int),
1015 .mode = 0444,
1016 .proc_handler = proc_dointvec,
1017 },
1018 {
1019 .procname = "io_delay_type",
1020 .data = &io_delay_type,
1021 .maxlen = sizeof(int),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025#endif
1026#if defined(CONFIG_MMU)
1027 {
1028 .procname = "randomize_va_space",
1029 .data = &randomize_va_space,
1030 .maxlen = sizeof(int),
1031 .mode = 0644,
1032 .proc_handler = proc_dointvec,
1033 },
1034#endif
1035#if defined(CONFIG_S390) && defined(CONFIG_SMP)
1036 {
1037 .procname = "spin_retry",
1038 .data = &spin_retry,
1039 .maxlen = sizeof (int),
1040 .mode = 0644,
1041 .proc_handler = proc_dointvec,
1042 },
1043#endif
1044#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1045 {
1046 .procname = "acpi_video_flags",
1047 .data = &acpi_realmode_flags,
1048 .maxlen = sizeof (unsigned long),
1049 .mode = 0644,
1050 .proc_handler = proc_doulongvec_minmax,
1051 },
1052#endif
1053#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1054 {
1055 .procname = "ignore-unaligned-usertrap",
1056 .data = &no_unaligned_warning,
1057 .maxlen = sizeof (int),
1058 .mode = 0644,
1059 .proc_handler = proc_dointvec,
1060 },
1061#endif
1062#ifdef CONFIG_IA64
1063 {
1064 .procname = "unaligned-dump-stack",
1065 .data = &unaligned_dump_stack,
1066 .maxlen = sizeof (int),
1067 .mode = 0644,
1068 .proc_handler = proc_dointvec,
1069 },
1070#endif
1071#ifdef CONFIG_DETECT_HUNG_TASK
1072 {
1073 .procname = "hung_task_panic",
1074 .data = &sysctl_hung_task_panic,
1075 .maxlen = sizeof(int),
1076 .mode = 0644,
1077 .proc_handler = proc_dointvec_minmax,
1078 .extra1 = &zero,
1079 .extra2 = &one,
1080 },
1081 {
1082 .procname = "hung_task_check_count",
1083 .data = &sysctl_hung_task_check_count,
1084 .maxlen = sizeof(unsigned long),
1085 .mode = 0644,
1086 .proc_handler = proc_doulongvec_minmax,
1087 },
1088 {
1089 .procname = "hung_task_timeout_secs",
1090 .data = &sysctl_hung_task_timeout_secs,
1091 .maxlen = sizeof(unsigned long),
1092 .mode = 0644,
1093 .proc_handler = proc_dohung_task_timeout_secs,
1094 .extra2 = &hung_task_timeout_max,
1095 },
1096 {
1097 .procname = "hung_task_warnings",
1098 .data = &sysctl_hung_task_warnings,
1099 .maxlen = sizeof(int),
1100 .mode = 0644,
1101 .proc_handler = proc_dointvec_minmax,
1102 .extra1 = &neg_one,
1103 },
1104#endif
1105#ifdef CONFIG_COMPAT
1106 {
1107 .procname = "compat-log",
1108 .data = &compat_log,
1109 .maxlen = sizeof (int),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec,
1112 },
1113#endif
1114#ifdef CONFIG_RT_MUTEXES
1115 {
1116 .procname = "max_lock_depth",
1117 .data = &max_lock_depth,
1118 .maxlen = sizeof(int),
1119 .mode = 0644,
1120 .proc_handler = proc_dointvec,
1121 },
1122#endif
1123 {
1124 .procname = "poweroff_cmd",
1125 .data = &poweroff_cmd,
1126 .maxlen = POWEROFF_CMD_PATH_LEN,
1127 .mode = 0644,
1128 .proc_handler = proc_dostring,
1129 },
1130#ifdef CONFIG_KEYS
1131 {
1132 .procname = "keys",
1133 .mode = 0555,
1134 .child = key_sysctls,
1135 },
1136#endif
1137#ifdef CONFIG_RCU_TORTURE_TEST
1138 {
1139 .procname = "rcutorture_runnable",
1140 .data = &rcutorture_runnable,
1141 .maxlen = sizeof(int),
1142 .mode = 0644,
1143 .proc_handler = proc_dointvec,
1144 },
1145#endif
1146#ifdef CONFIG_PERF_EVENTS
1147
1148
1149
1150
1151
1152
1153 {
1154 .procname = "perf_event_paranoid",
1155 .data = &sysctl_perf_event_paranoid,
1156 .maxlen = sizeof(sysctl_perf_event_paranoid),
1157 .mode = 0644,
1158 .proc_handler = proc_dointvec,
1159 },
1160 {
1161 .procname = "perf_event_mlock_kb",
1162 .data = &sysctl_perf_event_mlock,
1163 .maxlen = sizeof(sysctl_perf_event_mlock),
1164 .mode = 0644,
1165 .proc_handler = proc_dointvec,
1166 },
1167 {
1168 .procname = "perf_event_max_sample_rate",
1169 .data = &sysctl_perf_event_sample_rate,
1170 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1171 .mode = 0644,
1172 .proc_handler = perf_proc_update_handler,
1173 .extra1 = &one,
1174 },
1175 {
1176 .procname = "perf_cpu_time_max_percent",
1177 .data = &sysctl_perf_cpu_time_max_percent,
1178 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1179 .mode = 0644,
1180 .proc_handler = perf_cpu_time_max_percent_handler,
1181 .extra1 = &zero,
1182 .extra2 = &one_hundred,
1183 },
1184#endif
1185#ifdef CONFIG_KMEMCHECK
1186 {
1187 .procname = "kmemcheck",
1188 .data = &kmemcheck_enabled,
1189 .maxlen = sizeof(int),
1190 .mode = 0644,
1191 .proc_handler = proc_dointvec,
1192 },
1193#endif
1194 {
1195 .procname = "panic_on_warn",
1196 .data = &panic_on_warn,
1197 .maxlen = sizeof(int),
1198 .mode = 0644,
1199 .proc_handler = proc_dointvec_minmax,
1200 .extra1 = &zero,
1201 .extra2 = &one,
1202 },
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 = "nr_pdflush_threads",
1312 .mode = 0444 ,
1313 .proc_handler = pdflush_proc_obsolete,
1314 },
1315 {
1316 .procname = "swappiness",
1317 .data = &vm_swappiness,
1318 .maxlen = sizeof(vm_swappiness),
1319 .mode = 0644,
1320 .proc_handler = proc_dointvec_minmax,
1321 .extra1 = &zero,
1322 .extra2 = &one_hundred,
1323 },
1324#ifdef CONFIG_HUGETLB_PAGE
1325 {
1326 .procname = "nr_hugepages",
1327 .data = NULL,
1328 .maxlen = sizeof(unsigned long),
1329 .mode = 0644,
1330 .proc_handler = hugetlb_sysctl_handler,
1331 .extra1 = (void *)&hugetlb_zero,
1332 .extra2 = (void *)&hugetlb_infinity,
1333 },
1334#ifdef CONFIG_NUMA
1335 {
1336 .procname = "nr_hugepages_mempolicy",
1337 .data = NULL,
1338 .maxlen = sizeof(unsigned long),
1339 .mode = 0644,
1340 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1341 .extra1 = (void *)&hugetlb_zero,
1342 .extra2 = (void *)&hugetlb_infinity,
1343 },
1344#endif
1345 {
1346 .procname = "hugetlb_shm_group",
1347 .data = &sysctl_hugetlb_shm_group,
1348 .maxlen = sizeof(gid_t),
1349 .mode = 0644,
1350 .proc_handler = proc_dointvec,
1351 },
1352 {
1353 .procname = "hugepages_treat_as_movable",
1354 .data = &hugepages_treat_as_movable,
1355 .maxlen = sizeof(int),
1356 .mode = 0644,
1357 .proc_handler = proc_dointvec,
1358 },
1359 {
1360 .procname = "nr_overcommit_hugepages",
1361 .data = NULL,
1362 .maxlen = sizeof(unsigned long),
1363 .mode = 0644,
1364 .proc_handler = hugetlb_overcommit_handler,
1365 .extra1 = (void *)&hugetlb_zero,
1366 .extra2 = (void *)&hugetlb_infinity,
1367 },
1368#endif
1369 {
1370 .procname = "lowmem_reserve_ratio",
1371 .data = &sysctl_lowmem_reserve_ratio,
1372 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1373 .mode = 0644,
1374 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1375 },
1376 {
1377 .procname = "drop_caches",
1378 .data = &sysctl_drop_caches,
1379 .maxlen = sizeof(int),
1380 .mode = 0644,
1381 .proc_handler = drop_caches_sysctl_handler,
1382 .extra1 = &one,
1383 .extra2 = &four,
1384 },
1385#ifdef CONFIG_COMPACTION
1386 {
1387 .procname = "compact_memory",
1388 .data = &sysctl_compact_memory,
1389 .maxlen = sizeof(int),
1390 .mode = 0200,
1391 .proc_handler = sysctl_compaction_handler,
1392 },
1393 {
1394 .procname = "extfrag_threshold",
1395 .data = &sysctl_extfrag_threshold,
1396 .maxlen = sizeof(int),
1397 .mode = 0644,
1398 .proc_handler = sysctl_extfrag_handler,
1399 .extra1 = &min_extfrag_threshold,
1400 .extra2 = &max_extfrag_threshold,
1401 },
1402
1403#endif
1404 {
1405 .procname = "min_free_kbytes",
1406 .data = &min_free_kbytes,
1407 .maxlen = sizeof(min_free_kbytes),
1408 .mode = 0644,
1409 .proc_handler = min_free_kbytes_sysctl_handler,
1410 .extra1 = &zero,
1411 },
1412 {
1413 .procname = "percpu_pagelist_fraction",
1414 .data = &percpu_pagelist_fraction,
1415 .maxlen = sizeof(percpu_pagelist_fraction),
1416 .mode = 0644,
1417 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1418 .extra1 = &zero,
1419 },
1420#ifdef CONFIG_MMU
1421 {
1422 .procname = "max_map_count",
1423 .data = &sysctl_max_map_count,
1424 .maxlen = sizeof(sysctl_max_map_count),
1425 .mode = 0644,
1426 .proc_handler = proc_dointvec_minmax,
1427 .extra1 = &zero,
1428 },
1429#else
1430 {
1431 .procname = "nr_trim_pages",
1432 .data = &sysctl_nr_trim_pages,
1433 .maxlen = sizeof(sysctl_nr_trim_pages),
1434 .mode = 0644,
1435 .proc_handler = proc_dointvec_minmax,
1436 .extra1 = &zero,
1437 },
1438#endif
1439 {
1440 .procname = "laptop_mode",
1441 .data = &laptop_mode,
1442 .maxlen = sizeof(laptop_mode),
1443 .mode = 0644,
1444 .proc_handler = proc_dointvec_jiffies,
1445 },
1446 {
1447 .procname = "block_dump",
1448 .data = &block_dump,
1449 .maxlen = sizeof(block_dump),
1450 .mode = 0644,
1451 .proc_handler = proc_dointvec,
1452 .extra1 = &zero,
1453 },
1454 {
1455 .procname = "vfs_cache_pressure",
1456 .data = &sysctl_vfs_cache_pressure,
1457 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1458 .mode = 0644,
1459 .proc_handler = proc_dointvec,
1460 .extra1 = &zero,
1461 },
1462#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1463 {
1464 .procname = "legacy_va_layout",
1465 .data = &sysctl_legacy_va_layout,
1466 .maxlen = sizeof(sysctl_legacy_va_layout),
1467 .mode = 0644,
1468 .proc_handler = proc_dointvec,
1469 .extra1 = &zero,
1470 },
1471#endif
1472#ifdef CONFIG_NUMA
1473 {
1474 .procname = "zone_reclaim_mode",
1475 .data = &zone_reclaim_mode,
1476 .maxlen = sizeof(zone_reclaim_mode),
1477 .mode = 0644,
1478 .proc_handler = proc_dointvec,
1479 .extra1 = &zero,
1480 },
1481 {
1482 .procname = "min_unmapped_ratio",
1483 .data = &sysctl_min_unmapped_ratio,
1484 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1485 .mode = 0644,
1486 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1487 .extra1 = &zero,
1488 .extra2 = &one_hundred,
1489 },
1490 {
1491 .procname = "min_slab_ratio",
1492 .data = &sysctl_min_slab_ratio,
1493 .maxlen = sizeof(sysctl_min_slab_ratio),
1494 .mode = 0644,
1495 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1496 .extra1 = &zero,
1497 .extra2 = &one_hundred,
1498 },
1499#endif
1500#ifdef CONFIG_SMP
1501 {
1502 .procname = "stat_interval",
1503 .data = &sysctl_stat_interval,
1504 .maxlen = sizeof(sysctl_stat_interval),
1505 .mode = 0644,
1506 .proc_handler = proc_dointvec_jiffies,
1507 },
1508#endif
1509#ifdef CONFIG_MMU
1510 {
1511 .procname = "mmap_min_addr",
1512 .data = &dac_mmap_min_addr,
1513 .maxlen = sizeof(unsigned long),
1514 .mode = 0644,
1515 .proc_handler = mmap_min_addr_handler,
1516 },
1517#endif
1518#ifdef CONFIG_NUMA
1519 {
1520 .procname = "numa_zonelist_order",
1521 .data = &numa_zonelist_order,
1522 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1523 .mode = 0644,
1524 .proc_handler = numa_zonelist_order_handler,
1525 },
1526#endif
1527#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1528 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1529 {
1530 .procname = "vdso_enabled",
1531 .data = &vdso_enabled,
1532 .maxlen = sizeof(vdso_enabled),
1533 .mode = 0644,
1534 .proc_handler = proc_dointvec,
1535 .extra1 = &zero,
1536 },
1537#endif
1538#ifdef CONFIG_HIGHMEM
1539 {
1540 .procname = "highmem_is_dirtyable",
1541 .data = &vm_highmem_is_dirtyable,
1542 .maxlen = sizeof(vm_highmem_is_dirtyable),
1543 .mode = 0644,
1544 .proc_handler = proc_dointvec_minmax,
1545 .extra1 = &zero,
1546 .extra2 = &one,
1547 },
1548#endif
1549#ifdef CONFIG_MEMORY_FAILURE
1550 {
1551 .procname = "memory_failure_early_kill",
1552 .data = &sysctl_memory_failure_early_kill,
1553 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1554 .mode = 0644,
1555 .proc_handler = proc_dointvec_minmax,
1556 .extra1 = &zero,
1557 .extra2 = &one,
1558 },
1559 {
1560 .procname = "memory_failure_recovery",
1561 .data = &sysctl_memory_failure_recovery,
1562 .maxlen = sizeof(sysctl_memory_failure_recovery),
1563 .mode = 0644,
1564 .proc_handler = proc_dointvec_minmax,
1565 .extra1 = &zero,
1566 .extra2 = &one,
1567 },
1568#endif
1569 {
1570 .procname = "user_reserve_kbytes",
1571 .data = &sysctl_user_reserve_kbytes,
1572 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1573 .mode = 0644,
1574 .proc_handler = proc_doulongvec_minmax,
1575 },
1576 {
1577 .procname = "admin_reserve_kbytes",
1578 .data = &sysctl_admin_reserve_kbytes,
1579 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1580 .mode = 0644,
1581 .proc_handler = proc_doulongvec_minmax,
1582 },
1583#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1584 {
1585 .procname = "mmap_rnd_bits",
1586 .data = &mmap_rnd_bits,
1587 .maxlen = sizeof(mmap_rnd_bits),
1588 .mode = 0600,
1589 .proc_handler = proc_dointvec_minmax,
1590 .extra1 = (void *)&mmap_rnd_bits_min,
1591 .extra2 = (void *)&mmap_rnd_bits_max,
1592 },
1593#endif
1594#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1595 {
1596 .procname = "mmap_rnd_compat_bits",
1597 .data = &mmap_rnd_compat_bits,
1598 .maxlen = sizeof(mmap_rnd_compat_bits),
1599 .mode = 0600,
1600 .proc_handler = proc_dointvec_minmax,
1601 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1602 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1603 },
1604#endif
1605 { }
1606};
1607
1608static struct ctl_table fs_table[] = {
1609 {
1610 .procname = "inode-nr",
1611 .data = &inodes_stat,
1612 .maxlen = 2*sizeof(int),
1613 .mode = 0444,
1614 .proc_handler = proc_nr_inodes,
1615 },
1616 {
1617 .procname = "inode-state",
1618 .data = &inodes_stat,
1619 .maxlen = 7*sizeof(int),
1620 .mode = 0444,
1621 .proc_handler = proc_nr_inodes,
1622 },
1623 {
1624 .procname = "file-nr",
1625 .data = &files_stat,
1626 .maxlen = sizeof(files_stat),
1627 .mode = 0444,
1628 .proc_handler = proc_nr_files,
1629 },
1630 {
1631 .procname = "file-max",
1632 .data = &files_stat.max_files,
1633 .maxlen = sizeof(files_stat.max_files),
1634 .mode = 0644,
1635 .proc_handler = proc_doulongvec_minmax,
1636 },
1637 {
1638 .procname = "nr_open",
1639 .data = &sysctl_nr_open,
1640 .maxlen = sizeof(int),
1641 .mode = 0644,
1642 .proc_handler = proc_dointvec_minmax,
1643 .extra1 = &sysctl_nr_open_min,
1644 .extra2 = &sysctl_nr_open_max,
1645 },
1646 {
1647 .procname = "dentry-state",
1648 .data = &dentry_stat,
1649 .maxlen = 6*sizeof(int),
1650 .mode = 0444,
1651 .proc_handler = proc_nr_dentry,
1652 },
1653 {
1654 .procname = "overflowuid",
1655 .data = &fs_overflowuid,
1656 .maxlen = sizeof(int),
1657 .mode = 0644,
1658 .proc_handler = proc_dointvec_minmax,
1659 .extra1 = &minolduid,
1660 .extra2 = &maxolduid,
1661 },
1662 {
1663 .procname = "overflowgid",
1664 .data = &fs_overflowgid,
1665 .maxlen = sizeof(int),
1666 .mode = 0644,
1667 .proc_handler = proc_dointvec_minmax,
1668 .extra1 = &minolduid,
1669 .extra2 = &maxolduid,
1670 },
1671#ifdef CONFIG_FILE_LOCKING
1672 {
1673 .procname = "leases-enable",
1674 .data = &leases_enable,
1675 .maxlen = sizeof(int),
1676 .mode = 0644,
1677 .proc_handler = proc_dointvec,
1678 },
1679#endif
1680#ifdef CONFIG_DNOTIFY
1681 {
1682 .procname = "dir-notify-enable",
1683 .data = &dir_notify_enable,
1684 .maxlen = sizeof(int),
1685 .mode = 0644,
1686 .proc_handler = proc_dointvec,
1687 },
1688#endif
1689#ifdef CONFIG_MMU
1690#ifdef CONFIG_FILE_LOCKING
1691 {
1692 .procname = "lease-break-time",
1693 .data = &lease_break_time,
1694 .maxlen = sizeof(int),
1695 .mode = 0644,
1696 .proc_handler = proc_dointvec,
1697 },
1698#endif
1699#ifdef CONFIG_AIO
1700 {
1701 .procname = "aio-nr",
1702 .data = &aio_nr,
1703 .maxlen = sizeof(aio_nr),
1704 .mode = 0444,
1705 .proc_handler = proc_doulongvec_minmax,
1706 },
1707 {
1708 .procname = "aio-max-nr",
1709 .data = &aio_max_nr,
1710 .maxlen = sizeof(aio_max_nr),
1711 .mode = 0644,
1712 .proc_handler = proc_doulongvec_minmax,
1713 },
1714#endif
1715#ifdef CONFIG_INOTIFY_USER
1716 {
1717 .procname = "inotify",
1718 .mode = 0555,
1719 .child = inotify_table,
1720 },
1721#endif
1722#ifdef CONFIG_EPOLL
1723 {
1724 .procname = "epoll",
1725 .mode = 0555,
1726 .child = epoll_table,
1727 },
1728#endif
1729#endif
1730 {
1731 .procname = "protected_symlinks",
1732 .data = &sysctl_protected_symlinks,
1733 .maxlen = sizeof(int),
1734 .mode = 0600,
1735 .proc_handler = proc_dointvec_minmax,
1736 .extra1 = &zero,
1737 .extra2 = &one,
1738 },
1739 {
1740 .procname = "protected_hardlinks",
1741 .data = &sysctl_protected_hardlinks,
1742 .maxlen = sizeof(int),
1743 .mode = 0600,
1744 .proc_handler = proc_dointvec_minmax,
1745 .extra1 = &zero,
1746 .extra2 = &one,
1747 },
1748 {
1749 .procname = "suid_dumpable",
1750 .data = &suid_dumpable,
1751 .maxlen = sizeof(int),
1752 .mode = 0644,
1753 .proc_handler = proc_dointvec_minmax_coredump,
1754 .extra1 = &zero,
1755 .extra2 = &two,
1756 },
1757#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1758 {
1759 .procname = "binfmt_misc",
1760 .mode = 0555,
1761 .child = sysctl_mount_point,
1762 },
1763#endif
1764 {
1765 .procname = "pipe-max-size",
1766 .data = &pipe_max_size,
1767 .maxlen = sizeof(pipe_max_size),
1768 .mode = 0644,
1769 .proc_handler = &pipe_proc_fn,
1770 .extra1 = &pipe_min_size,
1771 },
1772 {
1773 .procname = "pipe-user-pages-hard",
1774 .data = &pipe_user_pages_hard,
1775 .maxlen = sizeof(pipe_user_pages_hard),
1776 .mode = 0644,
1777 .proc_handler = proc_doulongvec_minmax,
1778 },
1779 {
1780 .procname = "pipe-user-pages-soft",
1781 .data = &pipe_user_pages_soft,
1782 .maxlen = sizeof(pipe_user_pages_soft),
1783 .mode = 0644,
1784 .proc_handler = proc_doulongvec_minmax,
1785 },
1786 {
1787 .procname = "mount-max",
1788 .data = &sysctl_mount_max,
1789 .maxlen = sizeof(unsigned int),
1790 .mode = 0644,
1791 .proc_handler = proc_dointvec_minmax,
1792 .extra1 = &one,
1793 },
1794 { }
1795};
1796
1797static struct ctl_table debug_table[] = {
1798#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1799 {
1800 .procname = "exception-trace",
1801 .data = &show_unhandled_signals,
1802 .maxlen = sizeof(int),
1803 .mode = 0644,
1804 .proc_handler = proc_dointvec
1805 },
1806#endif
1807#if defined(CONFIG_OPTPROBES)
1808 {
1809 .procname = "kprobes-optimization",
1810 .data = &sysctl_kprobes_optimization,
1811 .maxlen = sizeof(int),
1812 .mode = 0644,
1813 .proc_handler = proc_kprobes_optimization_handler,
1814 .extra1 = &zero,
1815 .extra2 = &one,
1816 },
1817#endif
1818#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1819 {
1820 .procname = "panic_on_rcu_stall",
1821 .data = &sysctl_panic_on_rcu_stall,
1822 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1823 .mode = 0644,
1824 .proc_handler = proc_dointvec_minmax,
1825 .extra1 = &zero,
1826 .extra2 = &one,
1827 },
1828#endif
1829 { }
1830};
1831
1832static struct ctl_table dev_table[] = {
1833 { }
1834};
1835
1836int __init sysctl_init(void)
1837{
1838 struct ctl_table_header *hdr;
1839
1840 hdr = register_sysctl_table(sysctl_base_table);
1841 kmemleak_not_leak(hdr);
1842 return 0;
1843}
1844
1845#endif
1846
1847
1848
1849
1850
1851#ifdef CONFIG_PROC_SYSCTL
1852
1853static int _proc_do_string(char *data, int maxlen, int write,
1854 char __user *buffer,
1855 size_t *lenp, loff_t *ppos)
1856{
1857 size_t len;
1858 char __user *p;
1859 char c;
1860
1861 if (!data || !maxlen || !*lenp) {
1862 *lenp = 0;
1863 return 0;
1864 }
1865
1866 if (write) {
1867 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1868
1869 len = strlen(data);
1870 if (len > maxlen - 1)
1871 len = maxlen - 1;
1872
1873 if (*ppos > len)
1874 return 0;
1875 len = *ppos;
1876 } else {
1877
1878 len = 0;
1879 }
1880
1881 *ppos += *lenp;
1882 p = buffer;
1883 while ((p - buffer) < *lenp && len < maxlen - 1) {
1884 if (get_user(c, p++))
1885 return -EFAULT;
1886 if (c == 0 || c == '\n')
1887 break;
1888 data[len++] = c;
1889 }
1890 data[len] = 0;
1891 } else {
1892 len = strlen(data);
1893 if (len > maxlen)
1894 len = maxlen;
1895
1896 if (*ppos > len) {
1897 *lenp = 0;
1898 return 0;
1899 }
1900
1901 data += *ppos;
1902 len -= *ppos;
1903
1904 if (len > *lenp)
1905 len = *lenp;
1906 if (len)
1907 if (copy_to_user(buffer, data, len))
1908 return -EFAULT;
1909 if (len < *lenp) {
1910 if (put_user('\n', buffer + len))
1911 return -EFAULT;
1912 len++;
1913 }
1914 *lenp = len;
1915 *ppos += len;
1916 }
1917 return 0;
1918}
1919
1920static void warn_sysctl_write(struct ctl_table *table)
1921{
1922 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1923 "This will not be supported in the future. To silence this\n"
1924 "warning, set kernel.sysctl_writes_strict = -1\n",
1925 current->comm, table->procname);
1926}
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1938 struct ctl_table *table)
1939{
1940 if (!*ppos)
1941 return false;
1942
1943 switch (sysctl_writes_strict) {
1944 case SYSCTL_WRITES_STRICT:
1945 return true;
1946 case SYSCTL_WRITES_WARN:
1947 warn_sysctl_write(table);
1948 return false;
1949 default:
1950 return false;
1951 }
1952}
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971int proc_dostring(struct ctl_table *table, int write,
1972 void __user *buffer, size_t *lenp, loff_t *ppos)
1973{
1974 if (write)
1975 proc_first_pos_non_zero_ignore(ppos, table);
1976
1977 return _proc_do_string((char *)(table->data), table->maxlen, write,
1978 (char __user *)buffer, lenp, ppos);
1979}
1980
1981static size_t proc_skip_spaces(char **buf)
1982{
1983 size_t ret;
1984 char *tmp = skip_spaces(*buf);
1985 ret = tmp - *buf;
1986 *buf = tmp;
1987 return ret;
1988}
1989
1990static void proc_skip_char(char **buf, size_t *size, const char v)
1991{
1992 while (*size) {
1993 if (**buf != v)
1994 break;
1995 (*size)--;
1996 (*buf)++;
1997 }
1998}
1999
2000#define TMPBUFLEN 22
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017static int proc_get_long(char **buf, size_t *size,
2018 unsigned long *val, bool *neg,
2019 const char *perm_tr, unsigned perm_tr_len, char *tr)
2020{
2021 int len;
2022 char *p, tmp[TMPBUFLEN];
2023
2024 if (!*size)
2025 return -EINVAL;
2026
2027 len = *size;
2028 if (len > TMPBUFLEN - 1)
2029 len = TMPBUFLEN - 1;
2030
2031 memcpy(tmp, *buf, len);
2032
2033 tmp[len] = 0;
2034 p = tmp;
2035 if (*p == '-' && *size > 1) {
2036 *neg = true;
2037 p++;
2038 } else
2039 *neg = false;
2040 if (!isdigit(*p))
2041 return -EINVAL;
2042
2043 *val = simple_strtoul(p, &p, 0);
2044
2045 len = p - tmp;
2046
2047
2048
2049
2050 if (len == TMPBUFLEN - 1)
2051 return -EINVAL;
2052
2053 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2054 return -EINVAL;
2055
2056 if (tr && (len < *size))
2057 *tr = *p;
2058
2059 *buf += len;
2060 *size -= len;
2061
2062 return 0;
2063}
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2077 bool neg)
2078{
2079 int len;
2080 char tmp[TMPBUFLEN], *p = tmp;
2081
2082 sprintf(p, "%s%lu", neg ? "-" : "", val);
2083 len = strlen(tmp);
2084 if (len > *size)
2085 len = *size;
2086 if (copy_to_user(*buf, tmp, len))
2087 return -EFAULT;
2088 *size -= len;
2089 *buf += len;
2090 return 0;
2091}
2092#undef TMPBUFLEN
2093
2094static int proc_put_char(void __user **buf, size_t *size, char c)
2095{
2096 if (*size) {
2097 char __user **buffer = (char __user **)buf;
2098 if (put_user(c, *buffer))
2099 return -EFAULT;
2100 (*size)--, (*buffer)++;
2101 *buf = *buffer;
2102 }
2103 return 0;
2104}
2105
2106static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2107 int *valp,
2108 int write, void *data)
2109{
2110 if (write) {
2111 if (*negp) {
2112 if (*lvalp > (unsigned long) INT_MAX + 1)
2113 return -EINVAL;
2114 *valp = -*lvalp;
2115 } else {
2116 if (*lvalp > (unsigned long) INT_MAX)
2117 return -EINVAL;
2118 *valp = *lvalp;
2119 }
2120 } else {
2121 int val = *valp;
2122 if (val < 0) {
2123 *negp = true;
2124 *lvalp = (unsigned long)-val;
2125 } else {
2126 *negp = false;
2127 *lvalp = (unsigned long)val;
2128 }
2129 }
2130 return 0;
2131}
2132
2133static int do_proc_douintvec_conv(unsigned long *lvalp,
2134 unsigned int *valp,
2135 int write, void *data)
2136{
2137 if (write) {
2138 if (*lvalp > UINT_MAX)
2139 return -EINVAL;
2140 *valp = *lvalp;
2141 } else {
2142 unsigned int val = *valp;
2143 *lvalp = (unsigned long)val;
2144 }
2145 return 0;
2146}
2147
2148static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2149
2150static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2151 int write, void __user *buffer,
2152 size_t *lenp, loff_t *ppos,
2153 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2154 int write, void *data),
2155 void *data)
2156{
2157 int *i, vleft, first = 1, err = 0;
2158 unsigned long page = 0;
2159 size_t left;
2160 char *kbuf;
2161
2162 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2163 *lenp = 0;
2164 return 0;
2165 }
2166
2167 i = (int *) tbl_data;
2168 vleft = table->maxlen / sizeof(*i);
2169 left = *lenp;
2170
2171 if (!conv)
2172 conv = do_proc_dointvec_conv;
2173
2174 if (write) {
2175 if (proc_first_pos_non_zero_ignore(ppos, table))
2176 goto out;
2177
2178 if (left > PAGE_SIZE - 1)
2179 left = PAGE_SIZE - 1;
2180 page = __get_free_page(GFP_TEMPORARY);
2181 kbuf = (char *) page;
2182 if (!kbuf)
2183 return -ENOMEM;
2184 if (copy_from_user(kbuf, buffer, left)) {
2185 err = -EFAULT;
2186 goto free;
2187 }
2188 kbuf[left] = 0;
2189 }
2190
2191 for (; left && vleft--; i++, first=0) {
2192 unsigned long lval;
2193 bool neg;
2194
2195 if (write) {
2196 left -= proc_skip_spaces(&kbuf);
2197
2198 if (!left)
2199 break;
2200 err = proc_get_long(&kbuf, &left, &lval, &neg,
2201 proc_wspace_sep,
2202 sizeof(proc_wspace_sep), NULL);
2203 if (err)
2204 break;
2205 if (conv(&neg, &lval, i, 1, data)) {
2206 err = -EINVAL;
2207 break;
2208 }
2209 } else {
2210 if (conv(&neg, &lval, i, 0, data)) {
2211 err = -EINVAL;
2212 break;
2213 }
2214 if (!first)
2215 err = proc_put_char(&buffer, &left, '\t');
2216 if (err)
2217 break;
2218 err = proc_put_long(&buffer, &left, lval, neg);
2219 if (err)
2220 break;
2221 }
2222 }
2223
2224 if (!write && !first && left && !err)
2225 err = proc_put_char(&buffer, &left, '\n');
2226 if (write && !err && left)
2227 left -= proc_skip_spaces(&kbuf);
2228free:
2229 if (write) {
2230 free_page(page);
2231 if (first)
2232 return err ? : -EINVAL;
2233 }
2234 *lenp -= left;
2235out:
2236 *ppos += *lenp;
2237 return err;
2238}
2239
2240static int do_proc_dointvec(struct ctl_table *table, int write,
2241 void __user *buffer, size_t *lenp, loff_t *ppos,
2242 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2243 int write, void *data),
2244 void *data)
2245{
2246 return __do_proc_dointvec(table->data, table, write,
2247 buffer, lenp, ppos, conv, data);
2248}
2249
2250static int do_proc_douintvec_w(unsigned int *tbl_data,
2251 struct ctl_table *table,
2252 void __user *buffer,
2253 size_t *lenp, loff_t *ppos,
2254 int (*conv)(unsigned long *lvalp,
2255 unsigned int *valp,
2256 int write, void *data),
2257 void *data)
2258{
2259 unsigned long lval;
2260 int err = 0;
2261 size_t left;
2262 bool neg;
2263 char *kbuf = NULL, *p;
2264
2265 left = *lenp;
2266
2267 if (proc_first_pos_non_zero_ignore(ppos, table))
2268 goto bail_early;
2269
2270 if (left > PAGE_SIZE - 1)
2271 left = PAGE_SIZE - 1;
2272
2273 p = kbuf = memdup_user_nul(buffer, left);
2274 if (IS_ERR(kbuf))
2275 return -EINVAL;
2276
2277 left -= proc_skip_spaces(&p);
2278 if (!left) {
2279 err = -EINVAL;
2280 goto out_free;
2281 }
2282
2283 err = proc_get_long(&p, &left, &lval, &neg,
2284 proc_wspace_sep,
2285 sizeof(proc_wspace_sep), NULL);
2286 if (err || neg) {
2287 err = -EINVAL;
2288 goto out_free;
2289 }
2290
2291 if (conv(&lval, tbl_data, 1, data)) {
2292 err = -EINVAL;
2293 goto out_free;
2294 }
2295
2296 if (!err && left)
2297 left -= proc_skip_spaces(&p);
2298
2299out_free:
2300 kfree(kbuf);
2301 if (err)
2302 return -EINVAL;
2303
2304 return 0;
2305
2306
2307bail_early:
2308 *ppos += *lenp;
2309 return err;
2310}
2311
2312static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2313 size_t *lenp, loff_t *ppos,
2314 int (*conv)(unsigned long *lvalp,
2315 unsigned int *valp,
2316 int write, void *data),
2317 void *data)
2318{
2319 unsigned long lval;
2320 int err = 0;
2321 size_t left;
2322
2323 left = *lenp;
2324
2325 if (conv(&lval, tbl_data, 0, data)) {
2326 err = -EINVAL;
2327 goto out;
2328 }
2329
2330 err = proc_put_long(&buffer, &left, lval, false);
2331 if (err || !left)
2332 goto out;
2333
2334 err = proc_put_char(&buffer, &left, '\n');
2335
2336out:
2337 *lenp -= left;
2338 *ppos += *lenp;
2339
2340 return err;
2341}
2342
2343static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2344 int write, void __user *buffer,
2345 size_t *lenp, loff_t *ppos,
2346 int (*conv)(unsigned long *lvalp,
2347 unsigned int *valp,
2348 int write, void *data),
2349 void *data)
2350{
2351 unsigned int *i, vleft;
2352
2353 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2354 *lenp = 0;
2355 return 0;
2356 }
2357
2358 i = (unsigned int *) tbl_data;
2359 vleft = table->maxlen / sizeof(*i);
2360
2361
2362
2363
2364
2365 if (vleft != 1) {
2366 *lenp = 0;
2367 return -EINVAL;
2368 }
2369
2370 if (!conv)
2371 conv = do_proc_douintvec_conv;
2372
2373 if (write)
2374 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2375 conv, data);
2376 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2377}
2378
2379static int do_proc_douintvec(struct ctl_table *table, int write,
2380 void __user *buffer, size_t *lenp, loff_t *ppos,
2381 int (*conv)(unsigned long *lvalp,
2382 unsigned int *valp,
2383 int write, void *data),
2384 void *data)
2385{
2386 return __do_proc_douintvec(table->data, table, write,
2387 buffer, lenp, ppos, conv, data);
2388}
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403int proc_dointvec(struct ctl_table *table, int write,
2404 void __user *buffer, size_t *lenp, loff_t *ppos)
2405{
2406 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2407}
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422int proc_douintvec(struct ctl_table *table, int write,
2423 void __user *buffer, size_t *lenp, loff_t *ppos)
2424{
2425 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2426 do_proc_douintvec_conv, NULL);
2427}
2428
2429
2430
2431
2432
2433static int proc_taint(struct ctl_table *table, int write,
2434 void __user *buffer, size_t *lenp, loff_t *ppos)
2435{
2436 struct ctl_table t;
2437 unsigned long tmptaint = get_taint();
2438 int err;
2439
2440 if (write && !capable(CAP_SYS_ADMIN))
2441 return -EPERM;
2442
2443 t = *table;
2444 t.data = &tmptaint;
2445 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2446 if (err < 0)
2447 return err;
2448
2449 if (write) {
2450
2451
2452
2453
2454 int i;
2455 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2456 if ((tmptaint >> i) & 1)
2457 add_taint(i, LOCKDEP_STILL_OK);
2458 }
2459 }
2460
2461 return err;
2462}
2463
2464#ifdef CONFIG_PRINTK
2465static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2466 void __user *buffer, size_t *lenp, loff_t *ppos)
2467{
2468 if (write && !capable(CAP_SYS_ADMIN))
2469 return -EPERM;
2470
2471 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2472}
2473#endif
2474
2475struct do_proc_dointvec_minmax_conv_param {
2476 int *min;
2477 int *max;
2478};
2479
2480static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2481 int *valp,
2482 int write, void *data)
2483{
2484 struct do_proc_dointvec_minmax_conv_param *param = data;
2485 if (write) {
2486 int val = *negp ? -*lvalp : *lvalp;
2487 if ((param->min && *param->min > val) ||
2488 (param->max && *param->max < val))
2489 return -EINVAL;
2490 *valp = val;
2491 } else {
2492 int val = *valp;
2493 if (val < 0) {
2494 *negp = true;
2495 *lvalp = (unsigned long)-val;
2496 } else {
2497 *negp = false;
2498 *lvalp = (unsigned long)val;
2499 }
2500 }
2501 return 0;
2502}
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520int proc_dointvec_minmax(struct ctl_table *table, int write,
2521 void __user *buffer, size_t *lenp, loff_t *ppos)
2522{
2523 struct do_proc_dointvec_minmax_conv_param param = {
2524 .min = (int *) table->extra1,
2525 .max = (int *) table->extra2,
2526 };
2527 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2528 do_proc_dointvec_minmax_conv, ¶m);
2529}
2530
2531struct do_proc_douintvec_minmax_conv_param {
2532 unsigned int *min;
2533 unsigned int *max;
2534};
2535
2536static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2537 unsigned int *valp,
2538 int write, void *data)
2539{
2540 struct do_proc_douintvec_minmax_conv_param *param = data;
2541
2542 if (write) {
2543 unsigned int val = *lvalp;
2544
2545 if (*lvalp > UINT_MAX)
2546 return -EINVAL;
2547
2548 if ((param->min && *param->min > val) ||
2549 (param->max && *param->max < val))
2550 return -ERANGE;
2551
2552 *valp = val;
2553 } else {
2554 unsigned int val = *valp;
2555 *lvalp = (unsigned long) val;
2556 }
2557
2558 return 0;
2559}
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580int proc_douintvec_minmax(struct ctl_table *table, int write,
2581 void __user *buffer, size_t *lenp, loff_t *ppos)
2582{
2583 struct do_proc_douintvec_minmax_conv_param param = {
2584 .min = (unsigned int *) table->extra1,
2585 .max = (unsigned int *) table->extra2,
2586 };
2587 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2588 do_proc_douintvec_minmax_conv, ¶m);
2589}
2590
2591struct do_proc_dopipe_max_size_conv_param {
2592 unsigned int *min;
2593};
2594
2595static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2596 unsigned int *valp,
2597 int write, void *data)
2598{
2599 struct do_proc_dopipe_max_size_conv_param *param = data;
2600
2601 if (write) {
2602 unsigned int val;
2603
2604 if (*lvalp > UINT_MAX)
2605 return -EINVAL;
2606
2607 val = round_pipe_size(*lvalp);
2608 if (val == 0)
2609 return -EINVAL;
2610
2611 if (param->min && *param->min > val)
2612 return -ERANGE;
2613
2614 *valp = val;
2615 } else {
2616 unsigned int val = *valp;
2617 *lvalp = (unsigned long) val;
2618 }
2619
2620 return 0;
2621}
2622
2623int proc_dopipe_max_size(struct ctl_table *table, int write,
2624 void __user *buffer, size_t *lenp, loff_t *ppos)
2625{
2626 struct do_proc_dopipe_max_size_conv_param param = {
2627 .min = (unsigned int *) table->extra1,
2628 };
2629 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2630 do_proc_dopipe_max_size_conv, ¶m);
2631}
2632
2633static void validate_coredump_safety(void)
2634{
2635#ifdef CONFIG_COREDUMP
2636 if (suid_dumpable == SUID_DUMP_ROOT &&
2637 core_pattern[0] != '/' && core_pattern[0] != '|') {
2638 printk(KERN_WARNING "Unsafe core_pattern used with "\
2639 "suid_dumpable=2. Pipe handler or fully qualified "\
2640 "core dump path required.\n");
2641 }
2642#endif
2643}
2644
2645static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2646 void __user *buffer, size_t *lenp, loff_t *ppos)
2647{
2648 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2649 if (!error)
2650 validate_coredump_safety();
2651 return error;
2652}
2653
2654#ifdef CONFIG_COREDUMP
2655static int proc_dostring_coredump(struct ctl_table *table, int write,
2656 void __user *buffer, size_t *lenp, loff_t *ppos)
2657{
2658 int error = proc_dostring(table, write, buffer, lenp, ppos);
2659 if (!error)
2660 validate_coredump_safety();
2661 return error;
2662}
2663#endif
2664
2665static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2666 void __user *buffer,
2667 size_t *lenp, loff_t *ppos,
2668 unsigned long convmul,
2669 unsigned long convdiv)
2670{
2671 unsigned long *i, *min, *max;
2672 int vleft, first = 1, err = 0;
2673 unsigned long page = 0;
2674 size_t left;
2675 char *kbuf;
2676
2677 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2678 *lenp = 0;
2679 return 0;
2680 }
2681
2682 i = (unsigned long *) data;
2683 min = (unsigned long *) table->extra1;
2684 max = (unsigned long *) table->extra2;
2685 vleft = table->maxlen / sizeof(unsigned long);
2686 left = *lenp;
2687
2688 if (write) {
2689 if (proc_first_pos_non_zero_ignore(ppos, table))
2690 goto out;
2691
2692 if (left > PAGE_SIZE - 1)
2693 left = PAGE_SIZE - 1;
2694 page = __get_free_page(GFP_TEMPORARY);
2695 kbuf = (char *) page;
2696 if (!kbuf)
2697 return -ENOMEM;
2698 if (copy_from_user(kbuf, buffer, left)) {
2699 err = -EFAULT;
2700 goto free;
2701 }
2702 kbuf[left] = 0;
2703 }
2704
2705 for (; left && vleft--; i++, first = 0) {
2706 unsigned long val;
2707
2708 if (write) {
2709 bool neg;
2710
2711 left -= proc_skip_spaces(&kbuf);
2712
2713 err = proc_get_long(&kbuf, &left, &val, &neg,
2714 proc_wspace_sep,
2715 sizeof(proc_wspace_sep), NULL);
2716 if (err)
2717 break;
2718 if (neg)
2719 continue;
2720 if ((min && val < *min) || (max && val > *max))
2721 continue;
2722 *i = val;
2723 } else {
2724 val = convdiv * (*i) / convmul;
2725 if (!first)
2726 err = proc_put_char(&buffer, &left, '\t');
2727 err = proc_put_long(&buffer, &left, val, false);
2728 if (err)
2729 break;
2730 }
2731 }
2732
2733 if (!write && !first && left && !err)
2734 err = proc_put_char(&buffer, &left, '\n');
2735 if (write && !err)
2736 left -= proc_skip_spaces(&kbuf);
2737free:
2738 if (write) {
2739 free_page(page);
2740 if (first)
2741 return err ? : -EINVAL;
2742 }
2743 *lenp -= left;
2744out:
2745 *ppos += *lenp;
2746 return err;
2747}
2748
2749static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2750 void __user *buffer,
2751 size_t *lenp, loff_t *ppos,
2752 unsigned long convmul,
2753 unsigned long convdiv)
2754{
2755 return __do_proc_doulongvec_minmax(table->data, table, write,
2756 buffer, lenp, ppos, convmul, convdiv);
2757}
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775int proc_doulongvec_minmax(struct ctl_table *table, int write,
2776 void __user *buffer, size_t *lenp, loff_t *ppos)
2777{
2778 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2779}
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2799 void __user *buffer,
2800 size_t *lenp, loff_t *ppos)
2801{
2802 return do_proc_doulongvec_minmax(table, write, buffer,
2803 lenp, ppos, HZ, 1000l);
2804}
2805
2806
2807static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2808 int *valp,
2809 int write, void *data)
2810{
2811 if (write) {
2812 if (*lvalp > LONG_MAX / HZ)
2813 return 1;
2814 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2815 } else {
2816 int val = *valp;
2817 unsigned long lval;
2818 if (val < 0) {
2819 *negp = true;
2820 lval = (unsigned long)-val;
2821 } else {
2822 *negp = false;
2823 lval = (unsigned long)val;
2824 }
2825 *lvalp = lval / HZ;
2826 }
2827 return 0;
2828}
2829
2830static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2831 int *valp,
2832 int write, void *data)
2833{
2834 if (write) {
2835 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2836 return 1;
2837 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2838 } else {
2839 int val = *valp;
2840 unsigned long lval;
2841 if (val < 0) {
2842 *negp = true;
2843 lval = (unsigned long)-val;
2844 } else {
2845 *negp = false;
2846 lval = (unsigned long)val;
2847 }
2848 *lvalp = jiffies_to_clock_t(lval);
2849 }
2850 return 0;
2851}
2852
2853static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2854 int *valp,
2855 int write, void *data)
2856{
2857 if (write) {
2858 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2859
2860 if (jif > INT_MAX)
2861 return 1;
2862 *valp = (int)jif;
2863 } else {
2864 int val = *valp;
2865 unsigned long lval;
2866 if (val < 0) {
2867 *negp = true;
2868 lval = (unsigned long)-val;
2869 } else {
2870 *negp = false;
2871 lval = (unsigned long)val;
2872 }
2873 *lvalp = jiffies_to_msecs(lval);
2874 }
2875 return 0;
2876}
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893int proc_dointvec_jiffies(struct ctl_table *table, int write,
2894 void __user *buffer, size_t *lenp, loff_t *ppos)
2895{
2896 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2897 do_proc_dointvec_jiffies_conv,NULL);
2898}
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2916 void __user *buffer, size_t *lenp, loff_t *ppos)
2917{
2918 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2919 do_proc_dointvec_userhz_jiffies_conv,NULL);
2920}
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2939 void __user *buffer, size_t *lenp, loff_t *ppos)
2940{
2941 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2942 do_proc_dointvec_ms_jiffies_conv, NULL);
2943}
2944
2945static int proc_do_cad_pid(struct ctl_table *table, int write,
2946 void __user *buffer, size_t *lenp, loff_t *ppos)
2947{
2948 struct pid *new_pid;
2949 pid_t tmp;
2950 int r;
2951
2952 tmp = pid_vnr(cad_pid);
2953
2954 r = __do_proc_dointvec(&tmp, table, write, buffer,
2955 lenp, ppos, NULL, NULL);
2956 if (r || !write)
2957 return r;
2958
2959 new_pid = find_get_pid(tmp);
2960 if (!new_pid)
2961 return -ESRCH;
2962
2963 put_pid(xchg(&cad_pid, new_pid));
2964 return 0;
2965}
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984int proc_do_large_bitmap(struct ctl_table *table, int write,
2985 void __user *buffer, size_t *lenp, loff_t *ppos)
2986{
2987 int err = 0;
2988 bool first = 1;
2989 size_t left = *lenp;
2990 unsigned long bitmap_len = table->maxlen;
2991 unsigned long *bitmap = (unsigned long *) table->data;
2992 unsigned long *tmp_bitmap = NULL;
2993 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2994
2995 if (!bitmap_len || !left || (*ppos && !write)) {
2996 *lenp = 0;
2997 return 0;
2998 }
2999
3000 if (write) {
3001 unsigned long page = 0;
3002 char *kbuf;
3003
3004 if (left > PAGE_SIZE - 1)
3005 left = PAGE_SIZE - 1;
3006
3007 page = __get_free_page(GFP_TEMPORARY);
3008 kbuf = (char *) page;
3009 if (!kbuf)
3010 return -ENOMEM;
3011 if (copy_from_user(kbuf, buffer, left)) {
3012 free_page(page);
3013 return -EFAULT;
3014 }
3015 kbuf[left] = 0;
3016
3017 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3018 GFP_KERNEL);
3019 if (!tmp_bitmap) {
3020 free_page(page);
3021 return -ENOMEM;
3022 }
3023 proc_skip_char(&kbuf, &left, '\n');
3024 while (!err && left) {
3025 unsigned long val_a, val_b;
3026 bool neg;
3027
3028 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
3029 sizeof(tr_a), &c);
3030 if (err)
3031 break;
3032 if (val_a >= bitmap_len || neg) {
3033 err = -EINVAL;
3034 break;
3035 }
3036
3037 val_b = val_a;
3038 if (left) {
3039 kbuf++;
3040 left--;
3041 }
3042
3043 if (c == '-') {
3044 err = proc_get_long(&kbuf, &left, &val_b,
3045 &neg, tr_b, sizeof(tr_b),
3046 &c);
3047 if (err)
3048 break;
3049 if (val_b >= bitmap_len || neg ||
3050 val_a > val_b) {
3051 err = -EINVAL;
3052 break;
3053 }
3054 if (left) {
3055 kbuf++;
3056 left--;
3057 }
3058 }
3059
3060 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3061 first = 0;
3062 proc_skip_char(&kbuf, &left, '\n');
3063 }
3064 free_page(page);
3065 } else {
3066 unsigned long bit_a, bit_b = 0;
3067
3068 while (left) {
3069 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3070 if (bit_a >= bitmap_len)
3071 break;
3072 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3073 bit_a + 1) - 1;
3074
3075 if (!first) {
3076 err = proc_put_char(&buffer, &left, ',');
3077 if (err)
3078 break;
3079 }
3080 err = proc_put_long(&buffer, &left, bit_a, false);
3081 if (err)
3082 break;
3083 if (bit_a != bit_b) {
3084 err = proc_put_char(&buffer, &left, '-');
3085 if (err)
3086 break;
3087 err = proc_put_long(&buffer, &left, bit_b, false);
3088 if (err)
3089 break;
3090 }
3091
3092 first = 0; bit_b++;
3093 }
3094 if (!err)
3095 err = proc_put_char(&buffer, &left, '\n');
3096 }
3097
3098 if (!err) {
3099 if (write) {
3100 if (*ppos)
3101 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3102 else
3103 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3104 }
3105 kfree(tmp_bitmap);
3106 *lenp -= left;
3107 *ppos += *lenp;
3108 return 0;
3109 } else {
3110 kfree(tmp_bitmap);
3111 return err;
3112 }
3113}
3114
3115#else
3116
3117int proc_dostring(struct ctl_table *table, int write,
3118 void __user *buffer, size_t *lenp, loff_t *ppos)
3119{
3120 return -ENOSYS;
3121}
3122
3123int proc_dointvec(struct ctl_table *table, int write,
3124 void __user *buffer, size_t *lenp, loff_t *ppos)
3125{
3126 return -ENOSYS;
3127}
3128
3129int proc_douintvec(struct ctl_table *table, int write,
3130 void __user *buffer, size_t *lenp, loff_t *ppos)
3131{
3132 return -ENOSYS;
3133}
3134
3135int proc_dointvec_minmax(struct ctl_table *table, int write,
3136 void __user *buffer, size_t *lenp, loff_t *ppos)
3137{
3138 return -ENOSYS;
3139}
3140
3141int proc_douintvec_minmax(struct ctl_table *table, int write,
3142 void __user *buffer, size_t *lenp, loff_t *ppos)
3143{
3144 return -ENOSYS;
3145}
3146
3147int proc_dopipe_max_size(struct ctl_table *table, int write,
3148 void __user *buffer, size_t *lenp, loff_t *ppos)
3149{
3150 return -ENOSYS;
3151}
3152
3153int proc_dointvec_jiffies(struct ctl_table *table, int write,
3154 void __user *buffer, size_t *lenp, loff_t *ppos)
3155{
3156 return -ENOSYS;
3157}
3158
3159int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3160 void __user *buffer, size_t *lenp, loff_t *ppos)
3161{
3162 return -ENOSYS;
3163}
3164
3165int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3166 void __user *buffer, size_t *lenp, loff_t *ppos)
3167{
3168 return -ENOSYS;
3169}
3170
3171int proc_doulongvec_minmax(struct ctl_table *table, int write,
3172 void __user *buffer, size_t *lenp, loff_t *ppos)
3173{
3174 return -ENOSYS;
3175}
3176
3177int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3178 void __user *buffer,
3179 size_t *lenp, loff_t *ppos)
3180{
3181 return -ENOSYS;
3182}
3183
3184
3185#endif
3186
3187
3188
3189
3190
3191EXPORT_SYMBOL(proc_dointvec);
3192EXPORT_SYMBOL(proc_douintvec);
3193EXPORT_SYMBOL(proc_dointvec_jiffies);
3194EXPORT_SYMBOL(proc_dointvec_minmax);
3195EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3196EXPORT_SYMBOL_GPL(proc_dopipe_max_size);
3197EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3198EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3199EXPORT_SYMBOL(proc_dostring);
3200EXPORT_SYMBOL(proc_doulongvec_minmax);
3201EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3202
