projects/linux·blob v3.11-rc2 · refs

2667 lines · 60.6 KiB

1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
26#include <linux/bitmap.h>
27#include <linux/signal.h>
28#include <linux/printk.h>
29#include <linux/proc_fs.h>
30#include <linux/security.h>
31#include <linux/ctype.h>
32#include <linux/kmemcheck.h>
33#include <linux/kmemleak.h>
34#include <linux/fs.h>
35#include <linux/init.h>
36#include <linux/kernel.h>
37#include <linux/kobject.h>
38#include <linux/net.h>
39#include <linux/sysrq.h>
40#include <linux/highuid.h>
41#include <linux/writeback.h>
42#include <linux/ratelimit.h>
43#include <linux/compaction.h>
44#include <linux/hugetlb.h>
45#include <linux/initrd.h>
46#include <linux/key.h>
47#include <linux/times.h>
48#include <linux/limits.h>
49#include <linux/dcache.h>
50#include <linux/dnotify.h>
51#include <linux/syscalls.h>
52#include <linux/vmstat.h>
53#include <linux/nfs_fs.h>
54#include <linux/acpi.h>
55#include <linux/reboot.h>
56#include <linux/ftrace.h>
57#include <linux/perf_event.h>
58#include <linux/kprobes.h>
59#include <linux/pipe_fs_i.h>
60#include <linux/oom.h>
61#include <linux/kmod.h>
62#include <linux/capability.h>
63#include <linux/binfmts.h>
64#include <linux/sched/sysctl.h>
65
66#include <asm/uaccess.h>
67#include <asm/processor.h>
68
69#ifdef CONFIG_X86
70#include <asm/nmi.h>
71#include <asm/stacktrace.h>
72#include <asm/io.h>
73#endif
74#ifdef CONFIG_SPARC
75#include <asm/setup.h>
76#endif
77#ifdef CONFIG_BSD_PROCESS_ACCT
78#include <linux/acct.h>
79#endif
80#ifdef CONFIG_RT_MUTEXES
81#include <linux/rtmutex.h>
82#endif
83#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84#include <linux/lockdep.h>
85#endif
86#ifdef CONFIG_CHR_DEV_SG
87#include <scsi/sg.h>
88#endif
89
90#ifdef CONFIG_LOCKUP_DETECTOR
91#include <linux/nmi.h>
92#endif
93
94
95#if defined(CONFIG_SYSCTL)
96
97/* External variables not in a header file. */
98extern int sysctl_overcommit_memory;
99extern int sysctl_overcommit_ratio;
100extern int max_threads;
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 compat_log;
111extern int latencytop_enabled;
112extern int sysctl_nr_open_min, sysctl_nr_open_max;
113#ifndef CONFIG_MMU
114extern int sysctl_nr_trim_pages;
115#endif
116#ifdef CONFIG_BLOCK
117extern int blk_iopoll_enabled;
118#endif
119
120/* Constants used for minimum and maximum */
121#ifdef CONFIG_LOCKUP_DETECTOR
122static int sixty = 60;
123#endif
124
125static int zero;
126static int __maybe_unused one = 1;
127static int __maybe_unused two = 2;
128static int __maybe_unused three = 3;
129static unsigned long one_ul = 1;
130static int one_hundred = 100;
131#ifdef CONFIG_PRINTK
132static int ten_thousand = 10000;
133#endif
134
135/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
136static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
137
138/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
139static int maxolduid = 65535;
140static int minolduid;
141static int min_percpu_pagelist_fract = 8;
142
143static int ngroups_max = NGROUPS_MAX;
144static const int cap_last_cap = CAP_LAST_CAP;
145
146#ifdef CONFIG_INOTIFY_USER
147#include <linux/inotify.h>
148#endif
149#ifdef CONFIG_SPARC
150#endif
151
152#ifdef CONFIG_SPARC64
153extern int sysctl_tsb_ratio;
154#endif
155
156#ifdef __hppa__
157extern int pwrsw_enabled;
158#endif
159
160#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
161extern int unaligned_enabled;
162#endif
163
164#ifdef CONFIG_IA64
165extern int unaligned_dump_stack;
166#endif
167
168#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
169extern int no_unaligned_warning;
170#endif
171
172#ifdef CONFIG_PROC_SYSCTL
173static int proc_do_cad_pid(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175static int proc_taint(struct ctl_table *table, int write,
176 void __user *buffer, size_t *lenp, loff_t *ppos);
177#endif
178
179#ifdef CONFIG_PRINTK
180static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
181 void __user *buffer, size_t *lenp, loff_t *ppos);
182#endif
183
184static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186#ifdef CONFIG_COREDUMP
187static int proc_dostring_coredump(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp, loff_t *ppos);
189#endif
190
191#ifdef CONFIG_MAGIC_SYSRQ
192/* Note: sysrq code uses it's own private copy */
193static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
194
195static int sysrq_sysctl_handler(ctl_table *table, int write,
196 void __user *buffer, size_t *lenp,
197 loff_t *ppos)
198{
199 int error;
200
201 error = proc_dointvec(table, write, buffer, lenp, ppos);
202 if (error)
203 return error;
204
205 if (write)
206 sysrq_toggle_support(__sysrq_enabled);
207
208 return 0;
209}
210
211#endif
212
213static struct ctl_table kern_table[];
214static struct ctl_table vm_table[];
215static struct ctl_table fs_table[];
216static struct ctl_table debug_table[];
217static struct ctl_table dev_table[];
218extern struct ctl_table random_table[];
219#ifdef CONFIG_EPOLL
220extern struct ctl_table epoll_table[];
221#endif
222
223#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
224int sysctl_legacy_va_layout;
225#endif
226
227/* The default sysctl tables: */
228
229static struct ctl_table sysctl_base_table[] = {
230 {
231 .procname = "kernel",
232 .mode = 0555,
233 .child = kern_table,
234 },
235 {
236 .procname = "vm",
237 .mode = 0555,
238 .child = vm_table,
239 },
240 {
241 .procname = "fs",
242 .mode = 0555,
243 .child = fs_table,
244 },
245 {
246 .procname = "debug",
247 .mode = 0555,
248 .child = debug_table,
249 },
250 {
251 .procname = "dev",
252 .mode = 0555,
253 .child = dev_table,
254 },
255 { }
256};
257
258#ifdef CONFIG_SCHED_DEBUG
259static int min_sched_granularity_ns = 100000; /* 100 usecs */
260static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
261static int min_wakeup_granularity_ns; /* 0 usecs */
262static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
263#ifdef CONFIG_SMP
264static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
265static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
266#endif /* CONFIG_SMP */
267#endif /* CONFIG_SCHED_DEBUG */
268
269#ifdef CONFIG_COMPACTION
270static int min_extfrag_threshold;
271static int max_extfrag_threshold = 1000;
272#endif
273
274static struct ctl_table kern_table[] = {
275 {
276 .procname = "sched_child_runs_first",
277 .data = &sysctl_sched_child_runs_first,
278 .maxlen = sizeof(unsigned int),
279 .mode = 0644,
280 .proc_handler = proc_dointvec,
281 },
282#ifdef CONFIG_SCHED_DEBUG
283 {
284 .procname = "sched_min_granularity_ns",
285 .data = &sysctl_sched_min_granularity,
286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
288 .proc_handler = sched_proc_update_handler,
289 .extra1 = &min_sched_granularity_ns,
290 .extra2 = &max_sched_granularity_ns,
291 },
292 {
293 .procname = "sched_latency_ns",
294 .data = &sysctl_sched_latency,
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_wakeup_granularity_ns",
303 .data = &sysctl_sched_wakeup_granularity,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
306 .proc_handler = sched_proc_update_handler,
307 .extra1 = &min_wakeup_granularity_ns,
308 .extra2 = &max_wakeup_granularity_ns,
309 },
310#ifdef CONFIG_SMP
311 {
312 .procname = "sched_tunable_scaling",
313 .data = &sysctl_sched_tunable_scaling,
314 .maxlen = sizeof(enum sched_tunable_scaling),
315 .mode = 0644,
316 .proc_handler = sched_proc_update_handler,
317 .extra1 = &min_sched_tunable_scaling,
318 .extra2 = &max_sched_tunable_scaling,
319 },
320 {
321 .procname = "sched_migration_cost_ns",
322 .data = &sysctl_sched_migration_cost,
323 .maxlen = sizeof(unsigned int),
324 .mode = 0644,
325 .proc_handler = proc_dointvec,
326 },
327 {
328 .procname = "sched_nr_migrate",
329 .data = &sysctl_sched_nr_migrate,
330 .maxlen = sizeof(unsigned int),
331 .mode = 0644,
332 .proc_handler = proc_dointvec,
333 },
334 {
335 .procname = "sched_time_avg_ms",
336 .data = &sysctl_sched_time_avg,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
339 .proc_handler = proc_dointvec,
340 },
341 {
342 .procname = "sched_shares_window_ns",
343 .data = &sysctl_sched_shares_window,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = proc_dointvec,
347 },
348 {
349 .procname = "timer_migration",
350 .data = &sysctl_timer_migration,
351 .maxlen = sizeof(unsigned int),
352 .mode = 0644,
353 .proc_handler = proc_dointvec_minmax,
354 .extra1 = &zero,
355 .extra2 = &one,
356 },
357#endif /* CONFIG_SMP */
358#ifdef CONFIG_NUMA_BALANCING
359 {
360 .procname = "numa_balancing_scan_delay_ms",
361 .data = &sysctl_numa_balancing_scan_delay,
362 .maxlen = sizeof(unsigned int),
363 .mode = 0644,
364 .proc_handler = proc_dointvec,
365 },
366 {
367 .procname = "numa_balancing_scan_period_min_ms",
368 .data = &sysctl_numa_balancing_scan_period_min,
369 .maxlen = sizeof(unsigned int),
370 .mode = 0644,
371 .proc_handler = proc_dointvec,
372 },
373 {
374 .procname = "numa_balancing_scan_period_reset",
375 .data = &sysctl_numa_balancing_scan_period_reset,
376 .maxlen = sizeof(unsigned int),
377 .mode = 0644,
378 .proc_handler = proc_dointvec,
379 },
380 {
381 .procname = "numa_balancing_scan_period_max_ms",
382 .data = &sysctl_numa_balancing_scan_period_max,
383 .maxlen = sizeof(unsigned int),
384 .mode = 0644,
385 .proc_handler = proc_dointvec,
386 },
387 {
388 .procname = "numa_balancing_scan_size_mb",
389 .data = &sysctl_numa_balancing_scan_size,
390 .maxlen = sizeof(unsigned int),
391 .mode = 0644,
392 .proc_handler = proc_dointvec,
393 },
394#endif /* CONFIG_NUMA_BALANCING */
395#endif /* CONFIG_SCHED_DEBUG */
396 {
397 .procname = "sched_rt_period_us",
398 .data = &sysctl_sched_rt_period,
399 .maxlen = sizeof(unsigned int),
400 .mode = 0644,
401 .proc_handler = sched_rt_handler,
402 },
403 {
404 .procname = "sched_rt_runtime_us",
405 .data = &sysctl_sched_rt_runtime,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = sched_rt_handler,
409 },
410 {
411 .procname = "sched_rr_timeslice_ms",
412 .data = &sched_rr_timeslice,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = sched_rr_handler,
416 },
417#ifdef CONFIG_SCHED_AUTOGROUP
418 {
419 .procname = "sched_autogroup_enabled",
420 .data = &sysctl_sched_autogroup_enabled,
421 .maxlen = sizeof(unsigned int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec_minmax,
424 .extra1 = &zero,
425 .extra2 = &one,
426 },
427#endif
428#ifdef CONFIG_CFS_BANDWIDTH
429 {
430 .procname = "sched_cfs_bandwidth_slice_us",
431 .data = &sysctl_sched_cfs_bandwidth_slice,
432 .maxlen = sizeof(unsigned int),
433 .mode = 0644,
434 .proc_handler = proc_dointvec_minmax,
435 .extra1 = &one,
436 },
437#endif
438#ifdef CONFIG_PROVE_LOCKING
439 {
440 .procname = "prove_locking",
441 .data = &prove_locking,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec,
445 },
446#endif
447#ifdef CONFIG_LOCK_STAT
448 {
449 .procname = "lock_stat",
450 .data = &lock_stat,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec,
454 },
455#endif
456 {
457 .procname = "panic",
458 .data = &panic_timeout,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec,
462 },
463#ifdef CONFIG_COREDUMP
464 {
465 .procname = "core_uses_pid",
466 .data = &core_uses_pid,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec,
470 },
471 {
472 .procname = "core_pattern",
473 .data = core_pattern,
474 .maxlen = CORENAME_MAX_SIZE,
475 .mode = 0644,
476 .proc_handler = proc_dostring_coredump,
477 },
478 {
479 .procname = "core_pipe_limit",
480 .data = &core_pipe_limit,
481 .maxlen = sizeof(unsigned int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec,
484 },
485#endif
486#ifdef CONFIG_PROC_SYSCTL
487 {
488 .procname = "tainted",
489 .maxlen = sizeof(long),
490 .mode = 0644,
491 .proc_handler = proc_taint,
492 },
493#endif
494#ifdef CONFIG_LATENCYTOP
495 {
496 .procname = "latencytop",
497 .data = &latencytop_enabled,
498 .maxlen = sizeof(int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec,
501 },
502#endif
503#ifdef CONFIG_BLK_DEV_INITRD
504 {
505 .procname = "real-root-dev",
506 .data = &real_root_dev,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec,
510 },
511#endif
512 {
513 .procname = "print-fatal-signals",
514 .data = &print_fatal_signals,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519#ifdef CONFIG_SPARC
520 {
521 .procname = "reboot-cmd",
522 .data = reboot_command,
523 .maxlen = 256,
524 .mode = 0644,
525 .proc_handler = proc_dostring,
526 },
527 {
528 .procname = "stop-a",
529 .data = &stop_a_enabled,
530 .maxlen = sizeof (int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec,
533 },
534 {
535 .procname = "scons-poweroff",
536 .data = &scons_pwroff,
537 .maxlen = sizeof (int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec,
540 },
541#endif
542#ifdef CONFIG_SPARC64
543 {
544 .procname = "tsb-ratio",
545 .data = &sysctl_tsb_ratio,
546 .maxlen = sizeof (int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec,
549 },
550#endif
551#ifdef __hppa__
552 {
553 .procname = "soft-power",
554 .data = &pwrsw_enabled,
555 .maxlen = sizeof (int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec,
558 },
559#endif
560#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
561 {
562 .procname = "unaligned-trap",
563 .data = &unaligned_enabled,
564 .maxlen = sizeof (int),
565 .mode = 0644,
566 .proc_handler = proc_dointvec,
567 },
568#endif
569 {
570 .procname = "ctrl-alt-del",
571 .data = &C_A_D,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec,
575 },
576#ifdef CONFIG_FUNCTION_TRACER
577 {
578 .procname = "ftrace_enabled",
579 .data = &ftrace_enabled,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = ftrace_enable_sysctl,
583 },
584#endif
585#ifdef CONFIG_STACK_TRACER
586 {
587 .procname = "stack_tracer_enabled",
588 .data = &stack_tracer_enabled,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = stack_trace_sysctl,
592 },
593#endif
594#ifdef CONFIG_TRACING
595 {
596 .procname = "ftrace_dump_on_oops",
597 .data = &ftrace_dump_on_oops,
598 .maxlen = sizeof(int),
599 .mode = 0644,
600 .proc_handler = proc_dointvec,
601 },
602 {
603 .procname = "traceoff_on_warning",
604 .data = &__disable_trace_on_warning,
605 .maxlen = sizeof(__disable_trace_on_warning),
606 .mode = 0644,
607 .proc_handler = proc_dointvec,
608 },
609#endif
610#ifdef CONFIG_MODULES
611 {
612 .procname = "modprobe",
613 .data = &modprobe_path,
614 .maxlen = KMOD_PATH_LEN,
615 .mode = 0644,
616 .proc_handler = proc_dostring,
617 },
618 {
619 .procname = "modules_disabled",
620 .data = &modules_disabled,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 /* only handle a transition from default "0" to "1" */
624 .proc_handler = proc_dointvec_minmax,
625 .extra1 = &one,
626 .extra2 = &one,
627 },
628#endif
629
630 {
631 .procname = "hotplug",
632 .data = &uevent_helper,
633 .maxlen = UEVENT_HELPER_PATH_LEN,
634 .mode = 0644,
635 .proc_handler = proc_dostring,
636 },
637
638#ifdef CONFIG_CHR_DEV_SG
639 {
640 .procname = "sg-big-buff",
641 .data = &sg_big_buff,
642 .maxlen = sizeof (int),
643 .mode = 0444,
644 .proc_handler = proc_dointvec,
645 },
646#endif
647#ifdef CONFIG_BSD_PROCESS_ACCT
648 {
649 .procname = "acct",
650 .data = &acct_parm,
651 .maxlen = 3*sizeof(int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec,
654 },
655#endif
656#ifdef CONFIG_MAGIC_SYSRQ
657 {
658 .procname = "sysrq",
659 .data = &__sysrq_enabled,
660 .maxlen = sizeof (int),
661 .mode = 0644,
662 .proc_handler = sysrq_sysctl_handler,
663 },
664#endif
665#ifdef CONFIG_PROC_SYSCTL
666 {
667 .procname = "cad_pid",
668 .data = NULL,
669 .maxlen = sizeof (int),
670 .mode = 0600,
671 .proc_handler = proc_do_cad_pid,
672 },
673#endif
674 {
675 .procname = "threads-max",
676 .data = &max_threads,
677 .maxlen = sizeof(int),
678 .mode = 0644,
679 .proc_handler = proc_dointvec,
680 },
681 {
682 .procname = "random",
683 .mode = 0555,
684 .child = random_table,
685 },
686 {
687 .procname = "usermodehelper",
688 .mode = 0555,
689 .child = usermodehelper_table,
690 },
691 {
692 .procname = "overflowuid",
693 .data = &overflowuid,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = proc_dointvec_minmax,
697 .extra1 = &minolduid,
698 .extra2 = &maxolduid,
699 },
700 {
701 .procname = "overflowgid",
702 .data = &overflowgid,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = proc_dointvec_minmax,
706 .extra1 = &minolduid,
707 .extra2 = &maxolduid,
708 },
709#ifdef CONFIG_S390
710#ifdef CONFIG_MATHEMU
711 {
712 .procname = "ieee_emulation_warnings",
713 .data = &sysctl_ieee_emulation_warnings,
714 .maxlen = sizeof(int),
715 .mode = 0644,
716 .proc_handler = proc_dointvec,
717 },
718#endif
719 {
720 .procname = "userprocess_debug",
721 .data = &show_unhandled_signals,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec,
725 },
726#endif
727 {
728 .procname = "pid_max",
729 .data = &pid_max,
730 .maxlen = sizeof (int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &pid_max_min,
734 .extra2 = &pid_max_max,
735 },
736 {
737 .procname = "panic_on_oops",
738 .data = &panic_on_oops,
739 .maxlen = sizeof(int),
740 .mode = 0644,
741 .proc_handler = proc_dointvec,
742 },
743#if defined CONFIG_PRINTK
744 {
745 .procname = "printk",
746 .data = &console_loglevel,
747 .maxlen = 4*sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dointvec,
750 },
751 {
752 .procname = "printk_ratelimit",
753 .data = &printk_ratelimit_state.interval,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec_jiffies,
757 },
758 {
759 .procname = "printk_ratelimit_burst",
760 .data = &printk_ratelimit_state.burst,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec,
764 },
765 {
766 .procname = "printk_delay",
767 .data = &printk_delay_msec,
768 .maxlen = sizeof(int),
769 .mode = 0644,
770 .proc_handler = proc_dointvec_minmax,
771 .extra1 = &zero,
772 .extra2 = &ten_thousand,
773 },
774 {
775 .procname = "dmesg_restrict",
776 .data = &dmesg_restrict,
777 .maxlen = sizeof(int),
778 .mode = 0644,
779 .proc_handler = proc_dointvec_minmax_sysadmin,
780 .extra1 = &zero,
781 .extra2 = &one,
782 },
783 {
784 .procname = "kptr_restrict",
785 .data = &kptr_restrict,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec_minmax_sysadmin,
789 .extra1 = &zero,
790 .extra2 = &two,
791 },
792#endif
793 {
794 .procname = "ngroups_max",
795 .data = &ngroups_max,
796 .maxlen = sizeof (int),
797 .mode = 0444,
798 .proc_handler = proc_dointvec,
799 },
800 {
801 .procname = "cap_last_cap",
802 .data = (void *)&cap_last_cap,
803 .maxlen = sizeof(int),
804 .mode = 0444,
805 .proc_handler = proc_dointvec,
806 },
807#if defined(CONFIG_LOCKUP_DETECTOR)
808 {
809 .procname = "watchdog",
810 .data = &watchdog_user_enabled,
811 .maxlen = sizeof (int),
812 .mode = 0644,
813 .proc_handler = proc_dowatchdog,
814 .extra1 = &zero,
815 .extra2 = &one,
816 },
817 {
818 .procname = "watchdog_thresh",
819 .data = &watchdog_thresh,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dowatchdog,
823 .extra1 = &zero,
824 .extra2 = &sixty,
825 },
826 {
827 .procname = "softlockup_panic",
828 .data = &softlockup_panic,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec_minmax,
832 .extra1 = &zero,
833 .extra2 = &one,
834 },
835 {
836 .procname = "nmi_watchdog",
837 .data = &watchdog_user_enabled,
838 .maxlen = sizeof (int),
839 .mode = 0644,
840 .proc_handler = proc_dowatchdog,
841 .extra1 = &zero,
842 .extra2 = &one,
843 },
844#endif
845#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
846 {
847 .procname = "unknown_nmi_panic",
848 .data = &unknown_nmi_panic,
849 .maxlen = sizeof (int),
850 .mode = 0644,
851 .proc_handler = proc_dointvec,
852 },
853#endif
854#if defined(CONFIG_X86)
855 {
856 .procname = "panic_on_unrecovered_nmi",
857 .data = &panic_on_unrecovered_nmi,
858 .maxlen = sizeof(int),
859 .mode = 0644,
860 .proc_handler = proc_dointvec,
861 },
862 {
863 .procname = "panic_on_io_nmi",
864 .data = &panic_on_io_nmi,
865 .maxlen = sizeof(int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec,
868 },
869#ifdef CONFIG_DEBUG_STACKOVERFLOW
870 {
871 .procname = "panic_on_stackoverflow",
872 .data = &sysctl_panic_on_stackoverflow,
873 .maxlen = sizeof(int),
874 .mode = 0644,
875 .proc_handler = proc_dointvec,
876 },
877#endif
878 {
879 .procname = "bootloader_type",
880 .data = &bootloader_type,
881 .maxlen = sizeof (int),
882 .mode = 0444,
883 .proc_handler = proc_dointvec,
884 },
885 {
886 .procname = "bootloader_version",
887 .data = &bootloader_version,
888 .maxlen = sizeof (int),
889 .mode = 0444,
890 .proc_handler = proc_dointvec,
891 },
892 {
893 .procname = "kstack_depth_to_print",
894 .data = &kstack_depth_to_print,
895 .maxlen = sizeof(int),
896 .mode = 0644,
897 .proc_handler = proc_dointvec,
898 },
899 {
900 .procname = "io_delay_type",
901 .data = &io_delay_type,
902 .maxlen = sizeof(int),
903 .mode = 0644,
904 .proc_handler = proc_dointvec,
905 },
906#endif
907#if defined(CONFIG_MMU)
908 {
909 .procname = "randomize_va_space",
910 .data = &randomize_va_space,
911 .maxlen = sizeof(int),
912 .mode = 0644,
913 .proc_handler = proc_dointvec,
914 },
915#endif
916#if defined(CONFIG_S390) && defined(CONFIG_SMP)
917 {
918 .procname = "spin_retry",
919 .data = &spin_retry,
920 .maxlen = sizeof (int),
921 .mode = 0644,
922 .proc_handler = proc_dointvec,
923 },
924#endif
925#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
926 {
927 .procname = "acpi_video_flags",
928 .data = &acpi_realmode_flags,
929 .maxlen = sizeof (unsigned long),
930 .mode = 0644,
931 .proc_handler = proc_doulongvec_minmax,
932 },
933#endif
934#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
935 {
936 .procname = "ignore-unaligned-usertrap",
937 .data = &no_unaligned_warning,
938 .maxlen = sizeof (int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec,
941 },
942#endif
943#ifdef CONFIG_IA64
944 {
945 .procname = "unaligned-dump-stack",
946 .data = &unaligned_dump_stack,
947 .maxlen = sizeof (int),
948 .mode = 0644,
949 .proc_handler = proc_dointvec,
950 },
951#endif
952#ifdef CONFIG_DETECT_HUNG_TASK
953 {
954 .procname = "hung_task_panic",
955 .data = &sysctl_hung_task_panic,
956 .maxlen = sizeof(int),
957 .mode = 0644,
958 .proc_handler = proc_dointvec_minmax,
959 .extra1 = &zero,
960 .extra2 = &one,
961 },
962 {
963 .procname = "hung_task_check_count",
964 .data = &sysctl_hung_task_check_count,
965 .maxlen = sizeof(unsigned long),
966 .mode = 0644,
967 .proc_handler = proc_doulongvec_minmax,
968 },
969 {
970 .procname = "hung_task_timeout_secs",
971 .data = &sysctl_hung_task_timeout_secs,
972 .maxlen = sizeof(unsigned long),
973 .mode = 0644,
974 .proc_handler = proc_dohung_task_timeout_secs,
975 },
976 {
977 .procname = "hung_task_warnings",
978 .data = &sysctl_hung_task_warnings,
979 .maxlen = sizeof(unsigned long),
980 .mode = 0644,
981 .proc_handler = proc_doulongvec_minmax,
982 },
983#endif
984#ifdef CONFIG_COMPAT
985 {
986 .procname = "compat-log",
987 .data = &compat_log,
988 .maxlen = sizeof (int),
989 .mode = 0644,
990 .proc_handler = proc_dointvec,
991 },
992#endif
993#ifdef CONFIG_RT_MUTEXES
994 {
995 .procname = "max_lock_depth",
996 .data = &max_lock_depth,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec,
1000 },
1001#endif
1002 {
1003 .procname = "poweroff_cmd",
1004 .data = &poweroff_cmd,
1005 .maxlen = POWEROFF_CMD_PATH_LEN,
1006 .mode = 0644,
1007 .proc_handler = proc_dostring,
1008 },
1009#ifdef CONFIG_KEYS
1010 {
1011 .procname = "keys",
1012 .mode = 0555,
1013 .child = key_sysctls,
1014 },
1015#endif
1016#ifdef CONFIG_RCU_TORTURE_TEST
1017 {
1018 .procname = "rcutorture_runnable",
1019 .data = &rcutorture_runnable,
1020 .maxlen = sizeof(int),
1021 .mode = 0644,
1022 .proc_handler = proc_dointvec,
1023 },
1024#endif
1025#ifdef CONFIG_PERF_EVENTS
1026 /*
1027 * User-space scripts rely on the existence of this file
1028 * as a feature check for perf_events being enabled.
1029 *
1030 * So it's an ABI, do not remove!
1031 */
1032 {
1033 .procname = "perf_event_paranoid",
1034 .data = &sysctl_perf_event_paranoid,
1035 .maxlen = sizeof(sysctl_perf_event_paranoid),
1036 .mode = 0644,
1037 .proc_handler = proc_dointvec,
1038 },
1039 {
1040 .procname = "perf_event_mlock_kb",
1041 .data = &sysctl_perf_event_mlock,
1042 .maxlen = sizeof(sysctl_perf_event_mlock),
1043 .mode = 0644,
1044 .proc_handler = proc_dointvec,
1045 },
1046 {
1047 .procname = "perf_event_max_sample_rate",
1048 .data = &sysctl_perf_event_sample_rate,
1049 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1050 .mode = 0644,
1051 .proc_handler = perf_proc_update_handler,
1052 },
1053 {
1054 .procname = "perf_cpu_time_max_percent",
1055 .data = &sysctl_perf_cpu_time_max_percent,
1056 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1057 .mode = 0644,
1058 .proc_handler = perf_cpu_time_max_percent_handler,
1059 .extra1 = &zero,
1060 .extra2 = &one_hundred,
1061 },
1062#endif
1063#ifdef CONFIG_KMEMCHECK
1064 {
1065 .procname = "kmemcheck",
1066 .data = &kmemcheck_enabled,
1067 .maxlen = sizeof(int),
1068 .mode = 0644,
1069 .proc_handler = proc_dointvec,
1070 },
1071#endif
1072#ifdef CONFIG_BLOCK
1073 {
1074 .procname = "blk_iopoll",
1075 .data = &blk_iopoll_enabled,
1076 .maxlen = sizeof(int),
1077 .mode = 0644,
1078 .proc_handler = proc_dointvec,
1079 },
1080#endif
1081 { }
1082};
1083
1084static struct ctl_table vm_table[] = {
1085 {
1086 .procname = "overcommit_memory",
1087 .data = &sysctl_overcommit_memory,
1088 .maxlen = sizeof(sysctl_overcommit_memory),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec_minmax,
1091 .extra1 = &zero,
1092 .extra2 = &two,
1093 },
1094 {
1095 .procname = "panic_on_oom",
1096 .data = &sysctl_panic_on_oom,
1097 .maxlen = sizeof(sysctl_panic_on_oom),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec_minmax,
1100 .extra1 = &zero,
1101 .extra2 = &two,
1102 },
1103 {
1104 .procname = "oom_kill_allocating_task",
1105 .data = &sysctl_oom_kill_allocating_task,
1106 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1107 .mode = 0644,
1108 .proc_handler = proc_dointvec,
1109 },
1110 {
1111 .procname = "oom_dump_tasks",
1112 .data = &sysctl_oom_dump_tasks,
1113 .maxlen = sizeof(sysctl_oom_dump_tasks),
1114 .mode = 0644,
1115 .proc_handler = proc_dointvec,
1116 },
1117 {
1118 .procname = "overcommit_ratio",
1119 .data = &sysctl_overcommit_ratio,
1120 .maxlen = sizeof(sysctl_overcommit_ratio),
1121 .mode = 0644,
1122 .proc_handler = proc_dointvec,
1123 },
1124 {
1125 .procname = "page-cluster",
1126 .data = &page_cluster,
1127 .maxlen = sizeof(int),
1128 .mode = 0644,
1129 .proc_handler = proc_dointvec_minmax,
1130 .extra1 = &zero,
1131 },
1132 {
1133 .procname = "dirty_background_ratio",
1134 .data = &dirty_background_ratio,
1135 .maxlen = sizeof(dirty_background_ratio),
1136 .mode = 0644,
1137 .proc_handler = dirty_background_ratio_handler,
1138 .extra1 = &zero,
1139 .extra2 = &one_hundred,
1140 },
1141 {
1142 .procname = "dirty_background_bytes",
1143 .data = &dirty_background_bytes,
1144 .maxlen = sizeof(dirty_background_bytes),
1145 .mode = 0644,
1146 .proc_handler = dirty_background_bytes_handler,
1147 .extra1 = &one_ul,
1148 },
1149 {
1150 .procname = "dirty_ratio",
1151 .data = &vm_dirty_ratio,
1152 .maxlen = sizeof(vm_dirty_ratio),
1153 .mode = 0644,
1154 .proc_handler = dirty_ratio_handler,
1155 .extra1 = &zero,
1156 .extra2 = &one_hundred,
1157 },
1158 {
1159 .procname = "dirty_bytes",
1160 .data = &vm_dirty_bytes,
1161 .maxlen = sizeof(vm_dirty_bytes),
1162 .mode = 0644,
1163 .proc_handler = dirty_bytes_handler,
1164 .extra1 = &dirty_bytes_min,
1165 },
1166 {
1167 .procname = "dirty_writeback_centisecs",
1168 .data = &dirty_writeback_interval,
1169 .maxlen = sizeof(dirty_writeback_interval),
1170 .mode = 0644,
1171 .proc_handler = dirty_writeback_centisecs_handler,
1172 },
1173 {
1174 .procname = "dirty_expire_centisecs",
1175 .data = &dirty_expire_interval,
1176 .maxlen = sizeof(dirty_expire_interval),
1177 .mode = 0644,
1178 .proc_handler = proc_dointvec_minmax,
1179 .extra1 = &zero,
1180 },
1181 {
1182 .procname = "nr_pdflush_threads",
1183 .mode = 0444 /* read-only */,
1184 .proc_handler = pdflush_proc_obsolete,
1185 },
1186 {
1187 .procname = "swappiness",
1188 .data = &vm_swappiness,
1189 .maxlen = sizeof(vm_swappiness),
1190 .mode = 0644,
1191 .proc_handler = proc_dointvec_minmax,
1192 .extra1 = &zero,
1193 .extra2 = &one_hundred,
1194 },
1195#ifdef CONFIG_HUGETLB_PAGE
1196 {
1197 .procname = "nr_hugepages",
1198 .data = NULL,
1199 .maxlen = sizeof(unsigned long),
1200 .mode = 0644,
1201 .proc_handler = hugetlb_sysctl_handler,
1202 .extra1 = (void *)&hugetlb_zero,
1203 .extra2 = (void *)&hugetlb_infinity,
1204 },
1205#ifdef CONFIG_NUMA
1206 {
1207 .procname = "nr_hugepages_mempolicy",
1208 .data = NULL,
1209 .maxlen = sizeof(unsigned long),
1210 .mode = 0644,
1211 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1212 .extra1 = (void *)&hugetlb_zero,
1213 .extra2 = (void *)&hugetlb_infinity,
1214 },
1215#endif
1216 {
1217 .procname = "hugetlb_shm_group",
1218 .data = &sysctl_hugetlb_shm_group,
1219 .maxlen = sizeof(gid_t),
1220 .mode = 0644,
1221 .proc_handler = proc_dointvec,
1222 },
1223 {
1224 .procname = "hugepages_treat_as_movable",
1225 .data = &hugepages_treat_as_movable,
1226 .maxlen = sizeof(int),
1227 .mode = 0644,
1228 .proc_handler = hugetlb_treat_movable_handler,
1229 },
1230 {
1231 .procname = "nr_overcommit_hugepages",
1232 .data = NULL,
1233 .maxlen = sizeof(unsigned long),
1234 .mode = 0644,
1235 .proc_handler = hugetlb_overcommit_handler,
1236 .extra1 = (void *)&hugetlb_zero,
1237 .extra2 = (void *)&hugetlb_infinity,
1238 },
1239#endif
1240 {
1241 .procname = "lowmem_reserve_ratio",
1242 .data = &sysctl_lowmem_reserve_ratio,
1243 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1244 .mode = 0644,
1245 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1246 },
1247 {
1248 .procname = "drop_caches",
1249 .data = &sysctl_drop_caches,
1250 .maxlen = sizeof(int),
1251 .mode = 0644,
1252 .proc_handler = drop_caches_sysctl_handler,
1253 .extra1 = &one,
1254 .extra2 = &three,
1255 },
1256#ifdef CONFIG_COMPACTION
1257 {
1258 .procname = "compact_memory",
1259 .data = &sysctl_compact_memory,
1260 .maxlen = sizeof(int),
1261 .mode = 0200,
1262 .proc_handler = sysctl_compaction_handler,
1263 },
1264 {
1265 .procname = "extfrag_threshold",
1266 .data = &sysctl_extfrag_threshold,
1267 .maxlen = sizeof(int),
1268 .mode = 0644,
1269 .proc_handler = sysctl_extfrag_handler,
1270 .extra1 = &min_extfrag_threshold,
1271 .extra2 = &max_extfrag_threshold,
1272 },
1273
1274#endif /* CONFIG_COMPACTION */
1275 {
1276 .procname = "min_free_kbytes",
1277 .data = &min_free_kbytes,
1278 .maxlen = sizeof(min_free_kbytes),
1279 .mode = 0644,
1280 .proc_handler = min_free_kbytes_sysctl_handler,
1281 .extra1 = &zero,
1282 },
1283 {
1284 .procname = "percpu_pagelist_fraction",
1285 .data = &percpu_pagelist_fraction,
1286 .maxlen = sizeof(percpu_pagelist_fraction),
1287 .mode = 0644,
1288 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1289 .extra1 = &min_percpu_pagelist_fract,
1290 },
1291#ifdef CONFIG_MMU
1292 {
1293 .procname = "max_map_count",
1294 .data = &sysctl_max_map_count,
1295 .maxlen = sizeof(sysctl_max_map_count),
1296 .mode = 0644,
1297 .proc_handler = proc_dointvec_minmax,
1298 .extra1 = &zero,
1299 },
1300#else
1301 {
1302 .procname = "nr_trim_pages",
1303 .data = &sysctl_nr_trim_pages,
1304 .maxlen = sizeof(sysctl_nr_trim_pages),
1305 .mode = 0644,
1306 .proc_handler = proc_dointvec_minmax,
1307 .extra1 = &zero,
1308 },
1309#endif
1310 {
1311 .procname = "laptop_mode",
1312 .data = &laptop_mode,
1313 .maxlen = sizeof(laptop_mode),
1314 .mode = 0644,
1315 .proc_handler = proc_dointvec_jiffies,
1316 },
1317 {
1318 .procname = "block_dump",
1319 .data = &block_dump,
1320 .maxlen = sizeof(block_dump),
1321 .mode = 0644,
1322 .proc_handler = proc_dointvec,
1323 .extra1 = &zero,
1324 },
1325 {
1326 .procname = "vfs_cache_pressure",
1327 .data = &sysctl_vfs_cache_pressure,
1328 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1329 .mode = 0644,
1330 .proc_handler = proc_dointvec,
1331 .extra1 = &zero,
1332 },
1333#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1334 {
1335 .procname = "legacy_va_layout",
1336 .data = &sysctl_legacy_va_layout,
1337 .maxlen = sizeof(sysctl_legacy_va_layout),
1338 .mode = 0644,
1339 .proc_handler = proc_dointvec,
1340 .extra1 = &zero,
1341 },
1342#endif
1343#ifdef CONFIG_NUMA
1344 {
1345 .procname = "zone_reclaim_mode",
1346 .data = &zone_reclaim_mode,
1347 .maxlen = sizeof(zone_reclaim_mode),
1348 .mode = 0644,
1349 .proc_handler = proc_dointvec,
1350 .extra1 = &zero,
1351 },
1352 {
1353 .procname = "min_unmapped_ratio",
1354 .data = &sysctl_min_unmapped_ratio,
1355 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1356 .mode = 0644,
1357 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1358 .extra1 = &zero,
1359 .extra2 = &one_hundred,
1360 },
1361 {
1362 .procname = "min_slab_ratio",
1363 .data = &sysctl_min_slab_ratio,
1364 .maxlen = sizeof(sysctl_min_slab_ratio),
1365 .mode = 0644,
1366 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1367 .extra1 = &zero,
1368 .extra2 = &one_hundred,
1369 },
1370#endif
1371#ifdef CONFIG_SMP
1372 {
1373 .procname = "stat_interval",
1374 .data = &sysctl_stat_interval,
1375 .maxlen = sizeof(sysctl_stat_interval),
1376 .mode = 0644,
1377 .proc_handler = proc_dointvec_jiffies,
1378 },
1379#endif
1380#ifdef CONFIG_MMU
1381 {
1382 .procname = "mmap_min_addr",
1383 .data = &dac_mmap_min_addr,
1384 .maxlen = sizeof(unsigned long),
1385 .mode = 0644,
1386 .proc_handler = mmap_min_addr_handler,
1387 },
1388#endif
1389#ifdef CONFIG_NUMA
1390 {
1391 .procname = "numa_zonelist_order",
1392 .data = &numa_zonelist_order,
1393 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1394 .mode = 0644,
1395 .proc_handler = numa_zonelist_order_handler,
1396 },
1397#endif
1398#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1399 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1400 {
1401 .procname = "vdso_enabled",
1402 .data = &vdso_enabled,
1403 .maxlen = sizeof(vdso_enabled),
1404 .mode = 0644,
1405 .proc_handler = proc_dointvec,
1406 .extra1 = &zero,
1407 },
1408#endif
1409#ifdef CONFIG_HIGHMEM
1410 {
1411 .procname = "highmem_is_dirtyable",
1412 .data = &vm_highmem_is_dirtyable,
1413 .maxlen = sizeof(vm_highmem_is_dirtyable),
1414 .mode = 0644,
1415 .proc_handler = proc_dointvec_minmax,
1416 .extra1 = &zero,
1417 .extra2 = &one,
1418 },
1419#endif
1420 {
1421 .procname = "scan_unevictable_pages",
1422 .data = &scan_unevictable_pages,
1423 .maxlen = sizeof(scan_unevictable_pages),
1424 .mode = 0644,
1425 .proc_handler = scan_unevictable_handler,
1426 },
1427#ifdef CONFIG_MEMORY_FAILURE
1428 {
1429 .procname = "memory_failure_early_kill",
1430 .data = &sysctl_memory_failure_early_kill,
1431 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec_minmax,
1434 .extra1 = &zero,
1435 .extra2 = &one,
1436 },
1437 {
1438 .procname = "memory_failure_recovery",
1439 .data = &sysctl_memory_failure_recovery,
1440 .maxlen = sizeof(sysctl_memory_failure_recovery),
1441 .mode = 0644,
1442 .proc_handler = proc_dointvec_minmax,
1443 .extra1 = &zero,
1444 .extra2 = &one,
1445 },
1446#endif
1447 {
1448 .procname = "user_reserve_kbytes",
1449 .data = &sysctl_user_reserve_kbytes,
1450 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1451 .mode = 0644,
1452 .proc_handler = proc_doulongvec_minmax,
1453 },
1454 {
1455 .procname = "admin_reserve_kbytes",
1456 .data = &sysctl_admin_reserve_kbytes,
1457 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1458 .mode = 0644,
1459 .proc_handler = proc_doulongvec_minmax,
1460 },
1461 { }
1462};
1463
1464#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1465static struct ctl_table binfmt_misc_table[] = {
1466 { }
1467};
1468#endif
1469
1470static struct ctl_table fs_table[] = {
1471 {
1472 .procname = "inode-nr",
1473 .data = &inodes_stat,
1474 .maxlen = 2*sizeof(int),
1475 .mode = 0444,
1476 .proc_handler = proc_nr_inodes,
1477 },
1478 {
1479 .procname = "inode-state",
1480 .data = &inodes_stat,
1481 .maxlen = 7*sizeof(int),
1482 .mode = 0444,
1483 .proc_handler = proc_nr_inodes,
1484 },
1485 {
1486 .procname = "file-nr",
1487 .data = &files_stat,
1488 .maxlen = sizeof(files_stat),
1489 .mode = 0444,
1490 .proc_handler = proc_nr_files,
1491 },
1492 {
1493 .procname = "file-max",
1494 .data = &files_stat.max_files,
1495 .maxlen = sizeof(files_stat.max_files),
1496 .mode = 0644,
1497 .proc_handler = proc_doulongvec_minmax,
1498 },
1499 {
1500 .procname = "nr_open",
1501 .data = &sysctl_nr_open,
1502 .maxlen = sizeof(int),
1503 .mode = 0644,
1504 .proc_handler = proc_dointvec_minmax,
1505 .extra1 = &sysctl_nr_open_min,
1506 .extra2 = &sysctl_nr_open_max,
1507 },
1508 {
1509 .procname = "dentry-state",
1510 .data = &dentry_stat,
1511 .maxlen = 6*sizeof(int),
1512 .mode = 0444,
1513 .proc_handler = proc_nr_dentry,
1514 },
1515 {
1516 .procname = "overflowuid",
1517 .data = &fs_overflowuid,
1518 .maxlen = sizeof(int),
1519 .mode = 0644,
1520 .proc_handler = proc_dointvec_minmax,
1521 .extra1 = &minolduid,
1522 .extra2 = &maxolduid,
1523 },
1524 {
1525 .procname = "overflowgid",
1526 .data = &fs_overflowgid,
1527 .maxlen = sizeof(int),
1528 .mode = 0644,
1529 .proc_handler = proc_dointvec_minmax,
1530 .extra1 = &minolduid,
1531 .extra2 = &maxolduid,
1532 },
1533#ifdef CONFIG_FILE_LOCKING
1534 {
1535 .procname = "leases-enable",
1536 .data = &leases_enable,
1537 .maxlen = sizeof(int),
1538 .mode = 0644,
1539 .proc_handler = proc_dointvec,
1540 },
1541#endif
1542#ifdef CONFIG_DNOTIFY
1543 {
1544 .procname = "dir-notify-enable",
1545 .data = &dir_notify_enable,
1546 .maxlen = sizeof(int),
1547 .mode = 0644,
1548 .proc_handler = proc_dointvec,
1549 },
1550#endif
1551#ifdef CONFIG_MMU
1552#ifdef CONFIG_FILE_LOCKING
1553 {
1554 .procname = "lease-break-time",
1555 .data = &lease_break_time,
1556 .maxlen = sizeof(int),
1557 .mode = 0644,
1558 .proc_handler = proc_dointvec,
1559 },
1560#endif
1561#ifdef CONFIG_AIO
1562 {
1563 .procname = "aio-nr",
1564 .data = &aio_nr,
1565 .maxlen = sizeof(aio_nr),
1566 .mode = 0444,
1567 .proc_handler = proc_doulongvec_minmax,
1568 },
1569 {
1570 .procname = "aio-max-nr",
1571 .data = &aio_max_nr,
1572 .maxlen = sizeof(aio_max_nr),
1573 .mode = 0644,
1574 .proc_handler = proc_doulongvec_minmax,
1575 },
1576#endif /* CONFIG_AIO */
1577#ifdef CONFIG_INOTIFY_USER
1578 {
1579 .procname = "inotify",
1580 .mode = 0555,
1581 .child = inotify_table,
1582 },
1583#endif
1584#ifdef CONFIG_EPOLL
1585 {
1586 .procname = "epoll",
1587 .mode = 0555,
1588 .child = epoll_table,
1589 },
1590#endif
1591#endif
1592 {
1593 .procname = "protected_symlinks",
1594 .data = &sysctl_protected_symlinks,
1595 .maxlen = sizeof(int),
1596 .mode = 0600,
1597 .proc_handler = proc_dointvec_minmax,
1598 .extra1 = &zero,
1599 .extra2 = &one,
1600 },
1601 {
1602 .procname = "protected_hardlinks",
1603 .data = &sysctl_protected_hardlinks,
1604 .maxlen = sizeof(int),
1605 .mode = 0600,
1606 .proc_handler = proc_dointvec_minmax,
1607 .extra1 = &zero,
1608 .extra2 = &one,
1609 },
1610 {
1611 .procname = "suid_dumpable",
1612 .data = &suid_dumpable,
1613 .maxlen = sizeof(int),
1614 .mode = 0644,
1615 .proc_handler = proc_dointvec_minmax_coredump,
1616 .extra1 = &zero,
1617 .extra2 = &two,
1618 },
1619#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1620 {
1621 .procname = "binfmt_misc",
1622 .mode = 0555,
1623 .child = binfmt_misc_table,
1624 },
1625#endif
1626 {
1627 .procname = "pipe-max-size",
1628 .data = &pipe_max_size,
1629 .maxlen = sizeof(int),
1630 .mode = 0644,
1631 .proc_handler = &pipe_proc_fn,
1632 .extra1 = &pipe_min_size,
1633 },
1634 { }
1635};
1636
1637static struct ctl_table debug_table[] = {
1638#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1639 {
1640 .procname = "exception-trace",
1641 .data = &show_unhandled_signals,
1642 .maxlen = sizeof(int),
1643 .mode = 0644,
1644 .proc_handler = proc_dointvec
1645 },
1646#endif
1647#if defined(CONFIG_OPTPROBES)
1648 {
1649 .procname = "kprobes-optimization",
1650 .data = &sysctl_kprobes_optimization,
1651 .maxlen = sizeof(int),
1652 .mode = 0644,
1653 .proc_handler = proc_kprobes_optimization_handler,
1654 .extra1 = &zero,
1655 .extra2 = &one,
1656 },
1657#endif
1658 { }
1659};
1660
1661static struct ctl_table dev_table[] = {
1662 { }
1663};
1664
1665int __init sysctl_init(void)
1666{
1667 struct ctl_table_header *hdr;
1668
1669 hdr = register_sysctl_table(sysctl_base_table);
1670 kmemleak_not_leak(hdr);
1671 return 0;
1672}
1673
1674#endif /* CONFIG_SYSCTL */
1675
1676/*
1677 * /proc/sys support
1678 */
1679
1680#ifdef CONFIG_PROC_SYSCTL
1681
1682static int _proc_do_string(void* data, int maxlen, int write,
1683 void __user *buffer,
1684 size_t *lenp, loff_t *ppos)
1685{
1686 size_t len;
1687 char __user *p;
1688 char c;
1689
1690 if (!data || !maxlen || !*lenp) {
1691 *lenp = 0;
1692 return 0;
1693 }
1694
1695 if (write) {
1696 len = 0;
1697 p = buffer;
1698 while (len < *lenp) {
1699 if (get_user(c, p++))
1700 return -EFAULT;
1701 if (c == 0 || c == '\n')
1702 break;
1703 len++;
1704 }
1705 if (len >= maxlen)
1706 len = maxlen-1;
1707 if(copy_from_user(data, buffer, len))
1708 return -EFAULT;
1709 ((char *) data)[len] = 0;
1710 *ppos += *lenp;
1711 } else {
1712 len = strlen(data);
1713 if (len > maxlen)
1714 len = maxlen;
1715
1716 if (*ppos > len) {
1717 *lenp = 0;
1718 return 0;
1719 }
1720
1721 data += *ppos;
1722 len -= *ppos;
1723
1724 if (len > *lenp)
1725 len = *lenp;
1726 if (len)
1727 if(copy_to_user(buffer, data, len))
1728 return -EFAULT;
1729 if (len < *lenp) {
1730 if(put_user('\n', ((char __user *) buffer) + len))
1731 return -EFAULT;
1732 len++;
1733 }
1734 *lenp = len;
1735 *ppos += len;
1736 }
1737 return 0;
1738}
1739
1740/**
1741 * proc_dostring - read a string sysctl
1742 * @table: the sysctl table
1743 * @write: %TRUE if this is a write to the sysctl file
1744 * @buffer: the user buffer
1745 * @lenp: the size of the user buffer
1746 * @ppos: file position
1747 *
1748 * Reads/writes a string from/to the user buffer. If the kernel
1749 * buffer provided is not large enough to hold the string, the
1750 * string is truncated. The copied string is %NULL-terminated.
1751 * If the string is being read by the user process, it is copied
1752 * and a newline '\n' is added. It is truncated if the buffer is
1753 * not large enough.
1754 *
1755 * Returns 0 on success.
1756 */
1757int proc_dostring(struct ctl_table *table, int write,
1758 void __user *buffer, size_t *lenp, loff_t *ppos)
1759{
1760 return _proc_do_string(table->data, table->maxlen, write,
1761 buffer, lenp, ppos);
1762}
1763
1764static size_t proc_skip_spaces(char **buf)
1765{
1766 size_t ret;
1767 char *tmp = skip_spaces(*buf);
1768 ret = tmp - *buf;
1769 *buf = tmp;
1770 return ret;
1771}
1772
1773static void proc_skip_char(char **buf, size_t *size, const char v)
1774{
1775 while (*size) {
1776 if (**buf != v)
1777 break;
1778 (*size)--;
1779 (*buf)++;
1780 }
1781}
1782
1783#define TMPBUFLEN 22
1784/**
1785 * proc_get_long - reads an ASCII formatted integer from a user buffer
1786 *
1787 * @buf: a kernel buffer
1788 * @size: size of the kernel buffer
1789 * @val: this is where the number will be stored
1790 * @neg: set to %TRUE if number is negative
1791 * @perm_tr: a vector which contains the allowed trailers
1792 * @perm_tr_len: size of the perm_tr vector
1793 * @tr: pointer to store the trailer character
1794 *
1795 * In case of success %0 is returned and @buf and @size are updated with
1796 * the amount of bytes read. If @tr is non-NULL and a trailing
1797 * character exists (size is non-zero after returning from this
1798 * function), @tr is updated with the trailing character.
1799 */
1800static int proc_get_long(char **buf, size_t *size,
1801 unsigned long *val, bool *neg,
1802 const char *perm_tr, unsigned perm_tr_len, char *tr)
1803{
1804 int len;
1805 char *p, tmp[TMPBUFLEN];
1806
1807 if (!*size)
1808 return -EINVAL;
1809
1810 len = *size;
1811 if (len > TMPBUFLEN - 1)
1812 len = TMPBUFLEN - 1;
1813
1814 memcpy(tmp, *buf, len);
1815
1816 tmp[len] = 0;
1817 p = tmp;
1818 if (*p == '-' && *size > 1) {
1819 *neg = true;
1820 p++;
1821 } else
1822 *neg = false;
1823 if (!isdigit(*p))
1824 return -EINVAL;
1825
1826 *val = simple_strtoul(p, &p, 0);
1827
1828 len = p - tmp;
1829
1830 /* We don't know if the next char is whitespace thus we may accept
1831 * invalid integers (e.g. 1234...a) or two integers instead of one
1832 * (e.g. 123...1). So lets not allow such large numbers. */
1833 if (len == TMPBUFLEN - 1)
1834 return -EINVAL;
1835
1836 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1837 return -EINVAL;
1838
1839 if (tr && (len < *size))
1840 *tr = *p;
1841
1842 *buf += len;
1843 *size -= len;
1844
1845 return 0;
1846}
1847
1848/**
1849 * proc_put_long - converts an integer to a decimal ASCII formatted string
1850 *
1851 * @buf: the user buffer
1852 * @size: the size of the user buffer
1853 * @val: the integer to be converted
1854 * @neg: sign of the number, %TRUE for negative
1855 *
1856 * In case of success %0 is returned and @buf and @size are updated with
1857 * the amount of bytes written.
1858 */
1859static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1860 bool neg)
1861{
1862 int len;
1863 char tmp[TMPBUFLEN], *p = tmp;
1864
1865 sprintf(p, "%s%lu", neg ? "-" : "", val);
1866 len = strlen(tmp);
1867 if (len > *size)
1868 len = *size;
1869 if (copy_to_user(*buf, tmp, len))
1870 return -EFAULT;
1871 *size -= len;
1872 *buf += len;
1873 return 0;
1874}
1875#undef TMPBUFLEN
1876
1877static int proc_put_char(void __user **buf, size_t *size, char c)
1878{
1879 if (*size) {
1880 char __user **buffer = (char __user **)buf;
1881 if (put_user(c, *buffer))
1882 return -EFAULT;
1883 (*size)--, (*buffer)++;
1884 *buf = *buffer;
1885 }
1886 return 0;
1887}
1888
1889static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1890 int *valp,
1891 int write, void *data)
1892{
1893 if (write) {
1894 *valp = *negp ? -*lvalp : *lvalp;
1895 } else {
1896 int val = *valp;
1897 if (val < 0) {
1898 *negp = true;
1899 *lvalp = (unsigned long)-val;
1900 } else {
1901 *negp = false;
1902 *lvalp = (unsigned long)val;
1903 }
1904 }
1905 return 0;
1906}
1907
1908static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1909
1910static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1911 int write, void __user *buffer,
1912 size_t *lenp, loff_t *ppos,
1913 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1914 int write, void *data),
1915 void *data)
1916{
1917 int *i, vleft, first = 1, err = 0;
1918 unsigned long page = 0;
1919 size_t left;
1920 char *kbuf;
1921
1922 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1923 *lenp = 0;
1924 return 0;
1925 }
1926
1927 i = (int *) tbl_data;
1928 vleft = table->maxlen / sizeof(*i);
1929 left = *lenp;
1930
1931 if (!conv)
1932 conv = do_proc_dointvec_conv;
1933
1934 if (write) {
1935 if (left > PAGE_SIZE - 1)
1936 left = PAGE_SIZE - 1;
1937 page = __get_free_page(GFP_TEMPORARY);
1938 kbuf = (char *) page;
1939 if (!kbuf)
1940 return -ENOMEM;
1941 if (copy_from_user(kbuf, buffer, left)) {
1942 err = -EFAULT;
1943 goto free;
1944 }
1945 kbuf[left] = 0;
1946 }
1947
1948 for (; left && vleft--; i++, first=0) {
1949 unsigned long lval;
1950 bool neg;
1951
1952 if (write) {
1953 left -= proc_skip_spaces(&kbuf);
1954
1955 if (!left)
1956 break;
1957 err = proc_get_long(&kbuf, &left, &lval, &neg,
1958 proc_wspace_sep,
1959 sizeof(proc_wspace_sep), NULL);
1960 if (err)
1961 break;
1962 if (conv(&neg, &lval, i, 1, data)) {
1963 err = -EINVAL;
1964 break;
1965 }
1966 } else {
1967 if (conv(&neg, &lval, i, 0, data)) {
1968 err = -EINVAL;
1969 break;
1970 }
1971 if (!first)
1972 err = proc_put_char(&buffer, &left, '\t');
1973 if (err)
1974 break;
1975 err = proc_put_long(&buffer, &left, lval, neg);
1976 if (err)
1977 break;
1978 }
1979 }
1980
1981 if (!write && !first && left && !err)
1982 err = proc_put_char(&buffer, &left, '\n');
1983 if (write && !err && left)
1984 left -= proc_skip_spaces(&kbuf);
1985free:
1986 if (write) {
1987 free_page(page);
1988 if (first)
1989 return err ? : -EINVAL;
1990 }
1991 *lenp -= left;
1992 *ppos += *lenp;
1993 return err;
1994}
1995
1996static int do_proc_dointvec(struct ctl_table *table, int write,
1997 void __user *buffer, size_t *lenp, loff_t *ppos,
1998 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1999 int write, void *data),
2000 void *data)
2001{
2002 return __do_proc_dointvec(table->data, table, write,
2003 buffer, lenp, ppos, conv, data);
2004}
2005
2006/**
2007 * proc_dointvec - read a vector of integers
2008 * @table: the sysctl table
2009 * @write: %TRUE if this is a write to the sysctl file
2010 * @buffer: the user buffer
2011 * @lenp: the size of the user buffer
2012 * @ppos: file position
2013 *
2014 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2015 * values from/to the user buffer, treated as an ASCII string.
2016 *
2017 * Returns 0 on success.
2018 */
2019int proc_dointvec(struct ctl_table *table, int write,
2020 void __user *buffer, size_t *lenp, loff_t *ppos)
2021{
2022 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2023 NULL,NULL);
2024}
2025
2026/*
2027 * Taint values can only be increased
2028 * This means we can safely use a temporary.
2029 */
2030static int proc_taint(struct ctl_table *table, int write,
2031 void __user *buffer, size_t *lenp, loff_t *ppos)
2032{
2033 struct ctl_table t;
2034 unsigned long tmptaint = get_taint();
2035 int err;
2036
2037 if (write && !capable(CAP_SYS_ADMIN))
2038 return -EPERM;
2039
2040 t = *table;
2041 t.data = &tmptaint;
2042 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2043 if (err < 0)
2044 return err;
2045
2046 if (write) {
2047 /*
2048 * Poor man's atomic or. Not worth adding a primitive
2049 * to everyone's atomic.h for this
2050 */
2051 int i;
2052 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2053 if ((tmptaint >> i) & 1)
2054 add_taint(i, LOCKDEP_STILL_OK);
2055 }
2056 }
2057
2058 return err;
2059}
2060
2061#ifdef CONFIG_PRINTK
2062static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2063 void __user *buffer, size_t *lenp, loff_t *ppos)
2064{
2065 if (write && !capable(CAP_SYS_ADMIN))
2066 return -EPERM;
2067
2068 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2069}
2070#endif
2071
2072struct do_proc_dointvec_minmax_conv_param {
2073 int *min;
2074 int *max;
2075};
2076
2077static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2078 int *valp,
2079 int write, void *data)
2080{
2081 struct do_proc_dointvec_minmax_conv_param *param = data;
2082 if (write) {
2083 int val = *negp ? -*lvalp : *lvalp;
2084 if ((param->min && *param->min > val) ||
2085 (param->max && *param->max < val))
2086 return -EINVAL;
2087 *valp = val;
2088 } else {
2089 int val = *valp;
2090 if (val < 0) {
2091 *negp = true;
2092 *lvalp = (unsigned long)-val;
2093 } else {
2094 *negp = false;
2095 *lvalp = (unsigned long)val;
2096 }
2097 }
2098 return 0;
2099}
2100
2101/**
2102 * proc_dointvec_minmax - read a vector of integers with min/max values
2103 * @table: the sysctl table
2104 * @write: %TRUE if this is a write to the sysctl file
2105 * @buffer: the user buffer
2106 * @lenp: the size of the user buffer
2107 * @ppos: file position
2108 *
2109 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2110 * values from/to the user buffer, treated as an ASCII string.
2111 *
2112 * This routine will ensure the values are within the range specified by
2113 * table->extra1 (min) and table->extra2 (max).
2114 *
2115 * Returns 0 on success.
2116 */
2117int proc_dointvec_minmax(struct ctl_table *table, int write,
2118 void __user *buffer, size_t *lenp, loff_t *ppos)
2119{
2120 struct do_proc_dointvec_minmax_conv_param param = {
2121 .min = (int *) table->extra1,
2122 .max = (int *) table->extra2,
2123 };
2124 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2125 do_proc_dointvec_minmax_conv, &param);
2126}
2127
2128static void validate_coredump_safety(void)
2129{
2130#ifdef CONFIG_COREDUMP
2131 if (suid_dumpable == SUID_DUMP_ROOT &&
2132 core_pattern[0] != '/' && core_pattern[0] != '|') {
2133 printk(KERN_WARNING "Unsafe core_pattern used with "\
2134 "suid_dumpable=2. Pipe handler or fully qualified "\
2135 "core dump path required.\n");
2136 }
2137#endif
2138}
2139
2140static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2141 void __user *buffer, size_t *lenp, loff_t *ppos)
2142{
2143 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2144 if (!error)
2145 validate_coredump_safety();
2146 return error;
2147}
2148
2149#ifdef CONFIG_COREDUMP
2150static int proc_dostring_coredump(struct ctl_table *table, int write,
2151 void __user *buffer, size_t *lenp, loff_t *ppos)
2152{
2153 int error = proc_dostring(table, write, buffer, lenp, ppos);
2154 if (!error)
2155 validate_coredump_safety();
2156 return error;
2157}
2158#endif
2159
2160static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2161 void __user *buffer,
2162 size_t *lenp, loff_t *ppos,
2163 unsigned long convmul,
2164 unsigned long convdiv)
2165{
2166 unsigned long *i, *min, *max;
2167 int vleft, first = 1, err = 0;
2168 unsigned long page = 0;
2169 size_t left;
2170 char *kbuf;
2171
2172 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2173 *lenp = 0;
2174 return 0;
2175 }
2176
2177 i = (unsigned long *) data;
2178 min = (unsigned long *) table->extra1;
2179 max = (unsigned long *) table->extra2;
2180 vleft = table->maxlen / sizeof(unsigned long);
2181 left = *lenp;
2182
2183 if (write) {
2184 if (left > PAGE_SIZE - 1)
2185 left = PAGE_SIZE - 1;
2186 page = __get_free_page(GFP_TEMPORARY);
2187 kbuf = (char *) page;
2188 if (!kbuf)
2189 return -ENOMEM;
2190 if (copy_from_user(kbuf, buffer, left)) {
2191 err = -EFAULT;
2192 goto free;
2193 }
2194 kbuf[left] = 0;
2195 }
2196
2197 for (; left && vleft--; i++, first = 0) {
2198 unsigned long val;
2199
2200 if (write) {
2201 bool neg;
2202
2203 left -= proc_skip_spaces(&kbuf);
2204
2205 err = proc_get_long(&kbuf, &left, &val, &neg,
2206 proc_wspace_sep,
2207 sizeof(proc_wspace_sep), NULL);
2208 if (err)
2209 break;
2210 if (neg)
2211 continue;
2212 if ((min && val < *min) || (max && val > *max))
2213 continue;
2214 *i = val;
2215 } else {
2216 val = convdiv * (*i) / convmul;
2217 if (!first)
2218 err = proc_put_char(&buffer, &left, '\t');
2219 err = proc_put_long(&buffer, &left, val, false);
2220 if (err)
2221 break;
2222 }
2223 }
2224
2225 if (!write && !first && left && !err)
2226 err = proc_put_char(&buffer, &left, '\n');
2227 if (write && !err)
2228 left -= proc_skip_spaces(&kbuf);
2229free:
2230 if (write) {
2231 free_page(page);
2232 if (first)
2233 return err ? : -EINVAL;
2234 }
2235 *lenp -= left;
2236 *ppos += *lenp;
2237 return err;
2238}
2239
2240static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2241 void __user *buffer,
2242 size_t *lenp, loff_t *ppos,
2243 unsigned long convmul,
2244 unsigned long convdiv)
2245{
2246 return __do_proc_doulongvec_minmax(table->data, table, write,
2247 buffer, lenp, ppos, convmul, convdiv);
2248}
2249
2250/**
2251 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2252 * @table: the sysctl table
2253 * @write: %TRUE if this is a write to the sysctl file
2254 * @buffer: the user buffer
2255 * @lenp: the size of the user buffer
2256 * @ppos: file position
2257 *
2258 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2259 * values from/to the user buffer, treated as an ASCII string.
2260 *
2261 * This routine will ensure the values are within the range specified by
2262 * table->extra1 (min) and table->extra2 (max).
2263 *
2264 * Returns 0 on success.
2265 */
2266int proc_doulongvec_minmax(struct ctl_table *table, int write,
2267 void __user *buffer, size_t *lenp, loff_t *ppos)
2268{
2269 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2270}
2271
2272/**
2273 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2274 * @table: the sysctl table
2275 * @write: %TRUE if this is a write to the sysctl file
2276 * @buffer: the user buffer
2277 * @lenp: the size of the user buffer
2278 * @ppos: file position
2279 *
2280 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2281 * values from/to the user buffer, treated as an ASCII string. The values
2282 * are treated as milliseconds, and converted to jiffies when they are stored.
2283 *
2284 * This routine will ensure the values are within the range specified by
2285 * table->extra1 (min) and table->extra2 (max).
2286 *
2287 * Returns 0 on success.
2288 */
2289int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2290 void __user *buffer,
2291 size_t *lenp, loff_t *ppos)
2292{
2293 return do_proc_doulongvec_minmax(table, write, buffer,
2294 lenp, ppos, HZ, 1000l);
2295}
2296
2297
2298static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2299 int *valp,
2300 int write, void *data)
2301{
2302 if (write) {
2303 if (*lvalp > LONG_MAX / HZ)
2304 return 1;
2305 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2306 } else {
2307 int val = *valp;
2308 unsigned long lval;
2309 if (val < 0) {
2310 *negp = true;
2311 lval = (unsigned long)-val;
2312 } else {
2313 *negp = false;
2314 lval = (unsigned long)val;
2315 }
2316 *lvalp = lval / HZ;
2317 }
2318 return 0;
2319}
2320
2321static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2322 int *valp,
2323 int write, void *data)
2324{
2325 if (write) {
2326 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2327 return 1;
2328 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2329 } else {
2330 int val = *valp;
2331 unsigned long lval;
2332 if (val < 0) {
2333 *negp = true;
2334 lval = (unsigned long)-val;
2335 } else {
2336 *negp = false;
2337 lval = (unsigned long)val;
2338 }
2339 *lvalp = jiffies_to_clock_t(lval);
2340 }
2341 return 0;
2342}
2343
2344static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2345 int *valp,
2346 int write, void *data)
2347{
2348 if (write) {
2349 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2350 } else {
2351 int val = *valp;
2352 unsigned long lval;
2353 if (val < 0) {
2354 *negp = true;
2355 lval = (unsigned long)-val;
2356 } else {
2357 *negp = false;
2358 lval = (unsigned long)val;
2359 }
2360 *lvalp = jiffies_to_msecs(lval);
2361 }
2362 return 0;
2363}
2364
2365/**
2366 * proc_dointvec_jiffies - read a vector of integers as seconds
2367 * @table: the sysctl table
2368 * @write: %TRUE if this is a write to the sysctl file
2369 * @buffer: the user buffer
2370 * @lenp: the size of the user buffer
2371 * @ppos: file position
2372 *
2373 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2374 * values from/to the user buffer, treated as an ASCII string.
2375 * The values read are assumed to be in seconds, and are converted into
2376 * jiffies.
2377 *
2378 * Returns 0 on success.
2379 */
2380int proc_dointvec_jiffies(struct ctl_table *table, int write,
2381 void __user *buffer, size_t *lenp, loff_t *ppos)
2382{
2383 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2384 do_proc_dointvec_jiffies_conv,NULL);
2385}
2386
2387/**
2388 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2389 * @table: the sysctl table
2390 * @write: %TRUE if this is a write to the sysctl file
2391 * @buffer: the user buffer
2392 * @lenp: the size of the user buffer
2393 * @ppos: pointer to the file position
2394 *
2395 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2396 * values from/to the user buffer, treated as an ASCII string.
2397 * The values read are assumed to be in 1/USER_HZ seconds, and
2398 * are converted into jiffies.
2399 *
2400 * Returns 0 on success.
2401 */
2402int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2403 void __user *buffer, size_t *lenp, loff_t *ppos)
2404{
2405 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2406 do_proc_dointvec_userhz_jiffies_conv,NULL);
2407}
2408
2409/**
2410 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2411 * @table: the sysctl table
2412 * @write: %TRUE if this is a write to the sysctl file
2413 * @buffer: the user buffer
2414 * @lenp: the size of the user buffer
2415 * @ppos: file position
2416 * @ppos: the current position in the file
2417 *
2418 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2419 * values from/to the user buffer, treated as an ASCII string.
2420 * The values read are assumed to be in 1/1000 seconds, and
2421 * are converted into jiffies.
2422 *
2423 * Returns 0 on success.
2424 */
2425int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2426 void __user *buffer, size_t *lenp, loff_t *ppos)
2427{
2428 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2429 do_proc_dointvec_ms_jiffies_conv, NULL);
2430}
2431
2432static int proc_do_cad_pid(struct ctl_table *table, int write,
2433 void __user *buffer, size_t *lenp, loff_t *ppos)
2434{
2435 struct pid *new_pid;
2436 pid_t tmp;
2437 int r;
2438
2439 tmp = pid_vnr(cad_pid);
2440
2441 r = __do_proc_dointvec(&tmp, table, write, buffer,
2442 lenp, ppos, NULL, NULL);
2443 if (r || !write)
2444 return r;
2445
2446 new_pid = find_get_pid(tmp);
2447 if (!new_pid)
2448 return -ESRCH;
2449
2450 put_pid(xchg(&cad_pid, new_pid));
2451 return 0;
2452}
2453
2454/**
2455 * proc_do_large_bitmap - read/write from/to a large bitmap
2456 * @table: the sysctl table
2457 * @write: %TRUE if this is a write to the sysctl file
2458 * @buffer: the user buffer
2459 * @lenp: the size of the user buffer
2460 * @ppos: file position
2461 *
2462 * The bitmap is stored at table->data and the bitmap length (in bits)
2463 * in table->maxlen.
2464 *
2465 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2466 * large bitmaps may be represented in a compact manner. Writing into
2467 * the file will clear the bitmap then update it with the given input.
2468 *
2469 * Returns 0 on success.
2470 */
2471int proc_do_large_bitmap(struct ctl_table *table, int write,
2472 void __user *buffer, size_t *lenp, loff_t *ppos)
2473{
2474 int err = 0;
2475 bool first = 1;
2476 size_t left = *lenp;
2477 unsigned long bitmap_len = table->maxlen;
2478 unsigned long *bitmap = (unsigned long *) table->data;
2479 unsigned long *tmp_bitmap = NULL;
2480 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2481
2482 if (!bitmap_len || !left || (*ppos && !write)) {
2483 *lenp = 0;
2484 return 0;
2485 }
2486
2487 if (write) {
2488 unsigned long page = 0;
2489 char *kbuf;
2490
2491 if (left > PAGE_SIZE - 1)
2492 left = PAGE_SIZE - 1;
2493
2494 page = __get_free_page(GFP_TEMPORARY);
2495 kbuf = (char *) page;
2496 if (!kbuf)
2497 return -ENOMEM;
2498 if (copy_from_user(kbuf, buffer, left)) {
2499 free_page(page);
2500 return -EFAULT;
2501 }
2502 kbuf[left] = 0;
2503
2504 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2505 GFP_KERNEL);
2506 if (!tmp_bitmap) {
2507 free_page(page);
2508 return -ENOMEM;
2509 }
2510 proc_skip_char(&kbuf, &left, '\n');
2511 while (!err && left) {
2512 unsigned long val_a, val_b;
2513 bool neg;
2514
2515 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2516 sizeof(tr_a), &c);
2517 if (err)
2518 break;
2519 if (val_a >= bitmap_len || neg) {
2520 err = -EINVAL;
2521 break;
2522 }
2523
2524 val_b = val_a;
2525 if (left) {
2526 kbuf++;
2527 left--;
2528 }
2529
2530 if (c == '-') {
2531 err = proc_get_long(&kbuf, &left, &val_b,
2532 &neg, tr_b, sizeof(tr_b),
2533 &c);
2534 if (err)
2535 break;
2536 if (val_b >= bitmap_len || neg ||
2537 val_a > val_b) {
2538 err = -EINVAL;
2539 break;
2540 }
2541 if (left) {
2542 kbuf++;
2543 left--;
2544 }
2545 }
2546
2547 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2548 first = 0;
2549 proc_skip_char(&kbuf, &left, '\n');
2550 }
2551 free_page(page);
2552 } else {
2553 unsigned long bit_a, bit_b = 0;
2554
2555 while (left) {
2556 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2557 if (bit_a >= bitmap_len)
2558 break;
2559 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2560 bit_a + 1) - 1;
2561
2562 if (!first) {
2563 err = proc_put_char(&buffer, &left, ',');
2564 if (err)
2565 break;
2566 }
2567 err = proc_put_long(&buffer, &left, bit_a, false);
2568 if (err)
2569 break;
2570 if (bit_a != bit_b) {
2571 err = proc_put_char(&buffer, &left, '-');
2572 if (err)
2573 break;
2574 err = proc_put_long(&buffer, &left, bit_b, false);
2575 if (err)
2576 break;
2577 }
2578
2579 first = 0; bit_b++;
2580 }
2581 if (!err)
2582 err = proc_put_char(&buffer, &left, '\n');
2583 }
2584
2585 if (!err) {
2586 if (write) {
2587 if (*ppos)
2588 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2589 else
2590 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2591 }
2592 kfree(tmp_bitmap);
2593 *lenp -= left;
2594 *ppos += *lenp;
2595 return 0;
2596 } else {
2597 kfree(tmp_bitmap);
2598 return err;
2599 }
2600}
2601
2602#else /* CONFIG_PROC_SYSCTL */
2603
2604int proc_dostring(struct ctl_table *table, int write,
2605 void __user *buffer, size_t *lenp, loff_t *ppos)
2606{
2607 return -ENOSYS;
2608}
2609
2610int proc_dointvec(struct ctl_table *table, int write,
2611 void __user *buffer, size_t *lenp, loff_t *ppos)
2612{
2613 return -ENOSYS;
2614}
2615
2616int proc_dointvec_minmax(struct ctl_table *table, int write,
2617 void __user *buffer, size_t *lenp, loff_t *ppos)
2618{
2619 return -ENOSYS;
2620}
2621
2622int proc_dointvec_jiffies(struct ctl_table *table, int write,
2623 void __user *buffer, size_t *lenp, loff_t *ppos)
2624{
2625 return -ENOSYS;
2626}
2627
2628int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2629 void __user *buffer, size_t *lenp, loff_t *ppos)
2630{
2631 return -ENOSYS;
2632}
2633
2634int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2635 void __user *buffer, size_t *lenp, loff_t *ppos)
2636{
2637 return -ENOSYS;
2638}
2639
2640int proc_doulongvec_minmax(struct ctl_table *table, int write,
2641 void __user *buffer, size_t *lenp, loff_t *ppos)
2642{
2643 return -ENOSYS;
2644}
2645
2646int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2647 void __user *buffer,
2648 size_t *lenp, loff_t *ppos)
2649{
2650 return -ENOSYS;
2651}
2652
2653
2654#endif /* CONFIG_PROC_SYSCTL */
2655
2656/*
2657 * No sense putting this after each symbol definition, twice,
2658 * exception granted :-)
2659 */
2660EXPORT_SYMBOL(proc_dointvec);
2661EXPORT_SYMBOL(proc_dointvec_jiffies);
2662EXPORT_SYMBOL(proc_dointvec_minmax);
2663EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2664EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2665EXPORT_SYMBOL(proc_dostring);
2666EXPORT_SYMBOL(proc_doulongvec_minmax);
2667EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);