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1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21#include <linux/module.h>
22#include <linux/aio.h>
23#include <linux/mm.h>
24#include <linux/swap.h>
25#include <linux/slab.h>
26#include <linux/sysctl.h>
27#include <linux/bitmap.h>
28#include <linux/signal.h>
29#include <linux/printk.h>
30#include <linux/proc_fs.h>
31#include <linux/security.h>
32#include <linux/ctype.h>
33#include <linux/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/sched/coredump.h>
66#include <linux/kexec.h>
67#include <linux/bpf.h>
68#include <linux/mount.h>
69#include <linux/pipe_fs_i.h>
70
71#include <linux/uaccess.h>
72#include <asm/processor.h>
73
74#ifdef CONFIG_X86
75#include <asm/nmi.h>
76#include <asm/stacktrace.h>
77#include <asm/io.h>
78#endif
79#ifdef CONFIG_SPARC
80#include <asm/setup.h>
81#endif
82#ifdef CONFIG_BSD_PROCESS_ACCT
83#include <linux/acct.h>
84#endif
85#ifdef CONFIG_RT_MUTEXES
86#include <linux/rtmutex.h>
87#endif
88#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89#include <linux/lockdep.h>
90#endif
91#ifdef CONFIG_CHR_DEV_SG
92#include <scsi/sg.h>
93#endif
94
95#ifdef CONFIG_LOCKUP_DETECTOR
96#include <linux/nmi.h>
97#endif
98
99#if defined(CONFIG_SYSCTL)
100
101/* External variables not in a header file. */
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 latencytop_enabled;
112extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
113#ifndef CONFIG_MMU
114extern int sysctl_nr_trim_pages;
115#endif
116
117/* Constants used for minimum and maximum */
118#ifdef CONFIG_LOCKUP_DETECTOR
119static int sixty = 60;
120#endif
121
122static int __maybe_unused neg_one = -1;
123
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;
130static int one_thousand = 1000;
131#ifdef CONFIG_PRINTK
132static int ten_thousand = 10000;
133#endif
134#ifdef CONFIG_PERF_EVENTS
135static int six_hundred_forty_kb = 640 * 1024;
136#endif
137
138/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
141/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142static int maxolduid = 65535;
143static int minolduid;
144
145static int ngroups_max = NGROUPS_MAX;
146static const int cap_last_cap = CAP_LAST_CAP;
147
148/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149#ifdef CONFIG_DETECT_HUNG_TASK
150static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
151#endif
152
153#ifdef CONFIG_INOTIFY_USER
154#include <linux/inotify.h>
155#endif
156#ifdef CONFIG_SPARC
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/**
178 * enum sysctl_writes_mode - supported sysctl write modes
179 *
180 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
181 * to be written, and multiple writes on the same sysctl file descriptor
182 * will rewrite the sysctl value, regardless of file position. No warning
183 * is issued when the initial position is not 0.
184 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
185 * not 0.
186 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
187 * file position 0 and the value must be fully contained in the buffer
188 * sent to the write syscall. If dealing with strings respect the file
189 * position, but restrict this to the max length of the buffer, anything
190 * passed the max lenght will be ignored. Multiple writes will append
191 * to the buffer.
192 *
193 * These write modes control how current file position affects the behavior of
194 * updating sysctl values through the proc interface on each write.
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
221static int proc_dopipe_max_size(struct ctl_table *table, int write,
222 void __user *buffer, size_t *lenp, loff_t *ppos);
223
224#ifdef CONFIG_MAGIC_SYSRQ
225/* Note: sysrq code uses it's own private copy */
226static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
227
228static int sysrq_sysctl_handler(struct ctl_table *table, int write,
229 void __user *buffer, size_t *lenp,
230 loff_t *ppos)
231{
232 int error;
233
234 error = proc_dointvec(table, write, buffer, lenp, ppos);
235 if (error)
236 return error;
237
238 if (write)
239 sysrq_toggle_support(__sysrq_enabled);
240
241 return 0;
242}
243
244#endif
245
246static struct ctl_table kern_table[];
247static struct ctl_table vm_table[];
248static struct ctl_table fs_table[];
249static struct ctl_table debug_table[];
250static struct ctl_table dev_table[];
251extern struct ctl_table random_table[];
252#ifdef CONFIG_EPOLL
253extern struct ctl_table epoll_table[];
254#endif
255
256#ifdef CONFIG_FW_LOADER_USER_HELPER
257extern struct ctl_table firmware_config_table[];
258#endif
259
260#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
261int sysctl_legacy_va_layout;
262#endif
263
264/* The default sysctl tables: */
265
266static struct ctl_table sysctl_base_table[] = {
267 {
268 .procname = "kernel",
269 .mode = 0555,
270 .child = kern_table,
271 },
272 {
273 .procname = "vm",
274 .mode = 0555,
275 .child = vm_table,
276 },
277 {
278 .procname = "fs",
279 .mode = 0555,
280 .child = fs_table,
281 },
282 {
283 .procname = "debug",
284 .mode = 0555,
285 .child = debug_table,
286 },
287 {
288 .procname = "dev",
289 .mode = 0555,
290 .child = dev_table,
291 },
292 { }
293};
294
295#ifdef CONFIG_SCHED_DEBUG
296static int min_sched_granularity_ns = 100000; /* 100 usecs */
297static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
298static int min_wakeup_granularity_ns; /* 0 usecs */
299static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
300#ifdef CONFIG_SMP
301static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
302static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
303#endif /* CONFIG_SMP */
304#endif /* CONFIG_SCHED_DEBUG */
305
306#ifdef CONFIG_COMPACTION
307static int min_extfrag_threshold;
308static int max_extfrag_threshold = 1000;
309#endif
310
311static struct ctl_table kern_table[] = {
312 {
313 .procname = "sched_child_runs_first",
314 .data = &sysctl_sched_child_runs_first,
315 .maxlen = sizeof(unsigned int),
316 .mode = 0644,
317 .proc_handler = proc_dointvec,
318 },
319#ifdef CONFIG_SCHED_DEBUG
320 {
321 .procname = "sched_min_granularity_ns",
322 .data = &sysctl_sched_min_granularity,
323 .maxlen = sizeof(unsigned int),
324 .mode = 0644,
325 .proc_handler = sched_proc_update_handler,
326 .extra1 = &min_sched_granularity_ns,
327 .extra2 = &max_sched_granularity_ns,
328 },
329 {
330 .procname = "sched_latency_ns",
331 .data = &sysctl_sched_latency,
332 .maxlen = sizeof(unsigned int),
333 .mode = 0644,
334 .proc_handler = sched_proc_update_handler,
335 .extra1 = &min_sched_granularity_ns,
336 .extra2 = &max_sched_granularity_ns,
337 },
338 {
339 .procname = "sched_wakeup_granularity_ns",
340 .data = &sysctl_sched_wakeup_granularity,
341 .maxlen = sizeof(unsigned int),
342 .mode = 0644,
343 .proc_handler = sched_proc_update_handler,
344 .extra1 = &min_wakeup_granularity_ns,
345 .extra2 = &max_wakeup_granularity_ns,
346 },
347#ifdef CONFIG_SMP
348 {
349 .procname = "sched_tunable_scaling",
350 .data = &sysctl_sched_tunable_scaling,
351 .maxlen = sizeof(enum sched_tunable_scaling),
352 .mode = 0644,
353 .proc_handler = sched_proc_update_handler,
354 .extra1 = &min_sched_tunable_scaling,
355 .extra2 = &max_sched_tunable_scaling,
356 },
357 {
358 .procname = "sched_migration_cost_ns",
359 .data = &sysctl_sched_migration_cost,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
362 .proc_handler = proc_dointvec,
363 },
364 {
365 .procname = "sched_nr_migrate",
366 .data = &sysctl_sched_nr_migrate,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec,
370 },
371 {
372 .procname = "sched_time_avg_ms",
373 .data = &sysctl_sched_time_avg,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec_minmax,
377 .extra1 = &one,
378 },
379#ifdef CONFIG_SCHEDSTATS
380 {
381 .procname = "sched_schedstats",
382 .data = NULL,
383 .maxlen = sizeof(unsigned int),
384 .mode = 0644,
385 .proc_handler = sysctl_schedstats,
386 .extra1 = &zero,
387 .extra2 = &one,
388 },
389#endif /* CONFIG_SCHEDSTATS */
390#endif /* CONFIG_SMP */
391#ifdef CONFIG_NUMA_BALANCING
392 {
393 .procname = "numa_balancing_scan_delay_ms",
394 .data = &sysctl_numa_balancing_scan_delay,
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec,
398 },
399 {
400 .procname = "numa_balancing_scan_period_min_ms",
401 .data = &sysctl_numa_balancing_scan_period_min,
402 .maxlen = sizeof(unsigned int),
403 .mode = 0644,
404 .proc_handler = proc_dointvec,
405 },
406 {
407 .procname = "numa_balancing_scan_period_max_ms",
408 .data = &sysctl_numa_balancing_scan_period_max,
409 .maxlen = sizeof(unsigned int),
410 .mode = 0644,
411 .proc_handler = proc_dointvec,
412 },
413 {
414 .procname = "numa_balancing_scan_size_mb",
415 .data = &sysctl_numa_balancing_scan_size,
416 .maxlen = sizeof(unsigned int),
417 .mode = 0644,
418 .proc_handler = proc_dointvec_minmax,
419 .extra1 = &one,
420 },
421 {
422 .procname = "numa_balancing",
423 .data = NULL, /* filled in by handler */
424 .maxlen = sizeof(unsigned int),
425 .mode = 0644,
426 .proc_handler = sysctl_numa_balancing,
427 .extra1 = &zero,
428 .extra2 = &one,
429 },
430#endif /* CONFIG_NUMA_BALANCING */
431#endif /* CONFIG_SCHED_DEBUG */
432 {
433 .procname = "sched_rt_period_us",
434 .data = &sysctl_sched_rt_period,
435 .maxlen = sizeof(unsigned int),
436 .mode = 0644,
437 .proc_handler = sched_rt_handler,
438 },
439 {
440 .procname = "sched_rt_runtime_us",
441 .data = &sysctl_sched_rt_runtime,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = sched_rt_handler,
445 },
446 {
447 .procname = "sched_rr_timeslice_ms",
448 .data = &sysctl_sched_rr_timeslice,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = sched_rr_handler,
452 },
453#ifdef CONFIG_SCHED_AUTOGROUP
454 {
455 .procname = "sched_autogroup_enabled",
456 .data = &sysctl_sched_autogroup_enabled,
457 .maxlen = sizeof(unsigned int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec_minmax,
460 .extra1 = &zero,
461 .extra2 = &one,
462 },
463#endif
464#ifdef CONFIG_CFS_BANDWIDTH
465 {
466 .procname = "sched_cfs_bandwidth_slice_us",
467 .data = &sysctl_sched_cfs_bandwidth_slice,
468 .maxlen = sizeof(unsigned int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec_minmax,
471 .extra1 = &one,
472 },
473#endif
474#ifdef CONFIG_PROVE_LOCKING
475 {
476 .procname = "prove_locking",
477 .data = &prove_locking,
478 .maxlen = sizeof(int),
479 .mode = 0644,
480 .proc_handler = proc_dointvec,
481 },
482#endif
483#ifdef CONFIG_LOCK_STAT
484 {
485 .procname = "lock_stat",
486 .data = &lock_stat,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = proc_dointvec,
490 },
491#endif
492 {
493 .procname = "panic",
494 .data = &panic_timeout,
495 .maxlen = sizeof(int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec,
498 },
499#ifdef CONFIG_COREDUMP
500 {
501 .procname = "core_uses_pid",
502 .data = &core_uses_pid,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507 {
508 .procname = "core_pattern",
509 .data = core_pattern,
510 .maxlen = CORENAME_MAX_SIZE,
511 .mode = 0644,
512 .proc_handler = proc_dostring_coredump,
513 },
514 {
515 .procname = "core_pipe_limit",
516 .data = &core_pipe_limit,
517 .maxlen = sizeof(unsigned int),
518 .mode = 0644,
519 .proc_handler = proc_dointvec,
520 },
521#endif
522#ifdef CONFIG_PROC_SYSCTL
523 {
524 .procname = "tainted",
525 .maxlen = sizeof(long),
526 .mode = 0644,
527 .proc_handler = proc_taint,
528 },
529 {
530 .procname = "sysctl_writes_strict",
531 .data = &sysctl_writes_strict,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = proc_dointvec_minmax,
535 .extra1 = &neg_one,
536 .extra2 = &one,
537 },
538#endif
539#ifdef CONFIG_LATENCYTOP
540 {
541 .procname = "latencytop",
542 .data = &latencytop_enabled,
543 .maxlen = sizeof(int),
544 .mode = 0644,
545 .proc_handler = sysctl_latencytop,
546 },
547#endif
548#ifdef CONFIG_BLK_DEV_INITRD
549 {
550 .procname = "real-root-dev",
551 .data = &real_root_dev,
552 .maxlen = sizeof(int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec,
555 },
556#endif
557 {
558 .procname = "print-fatal-signals",
559 .data = &print_fatal_signals,
560 .maxlen = sizeof(int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec,
563 },
564#ifdef CONFIG_SPARC
565 {
566 .procname = "reboot-cmd",
567 .data = reboot_command,
568 .maxlen = 256,
569 .mode = 0644,
570 .proc_handler = proc_dostring,
571 },
572 {
573 .procname = "stop-a",
574 .data = &stop_a_enabled,
575 .maxlen = sizeof (int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec,
578 },
579 {
580 .procname = "scons-poweroff",
581 .data = &scons_pwroff,
582 .maxlen = sizeof (int),
583 .mode = 0644,
584 .proc_handler = proc_dointvec,
585 },
586#endif
587#ifdef CONFIG_SPARC64
588 {
589 .procname = "tsb-ratio",
590 .data = &sysctl_tsb_ratio,
591 .maxlen = sizeof (int),
592 .mode = 0644,
593 .proc_handler = proc_dointvec,
594 },
595#endif
596#ifdef __hppa__
597 {
598 .procname = "soft-power",
599 .data = &pwrsw_enabled,
600 .maxlen = sizeof (int),
601 .mode = 0644,
602 .proc_handler = proc_dointvec,
603 },
604#endif
605#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
606 {
607 .procname = "unaligned-trap",
608 .data = &unaligned_enabled,
609 .maxlen = sizeof (int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec,
612 },
613#endif
614 {
615 .procname = "ctrl-alt-del",
616 .data = &C_A_D,
617 .maxlen = sizeof(int),
618 .mode = 0644,
619 .proc_handler = proc_dointvec,
620 },
621#ifdef CONFIG_FUNCTION_TRACER
622 {
623 .procname = "ftrace_enabled",
624 .data = &ftrace_enabled,
625 .maxlen = sizeof(int),
626 .mode = 0644,
627 .proc_handler = ftrace_enable_sysctl,
628 },
629#endif
630#ifdef CONFIG_STACK_TRACER
631 {
632 .procname = "stack_tracer_enabled",
633 .data = &stack_tracer_enabled,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = stack_trace_sysctl,
637 },
638#endif
639#ifdef CONFIG_TRACING
640 {
641 .procname = "ftrace_dump_on_oops",
642 .data = &ftrace_dump_on_oops,
643 .maxlen = sizeof(int),
644 .mode = 0644,
645 .proc_handler = proc_dointvec,
646 },
647 {
648 .procname = "traceoff_on_warning",
649 .data = &__disable_trace_on_warning,
650 .maxlen = sizeof(__disable_trace_on_warning),
651 .mode = 0644,
652 .proc_handler = proc_dointvec,
653 },
654 {
655 .procname = "tracepoint_printk",
656 .data = &tracepoint_printk,
657 .maxlen = sizeof(tracepoint_printk),
658 .mode = 0644,
659 .proc_handler = tracepoint_printk_sysctl,
660 },
661#endif
662#ifdef CONFIG_KEXEC_CORE
663 {
664 .procname = "kexec_load_disabled",
665 .data = &kexec_load_disabled,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 /* only handle a transition from default "0" to "1" */
669 .proc_handler = proc_dointvec_minmax,
670 .extra1 = &one,
671 .extra2 = &one,
672 },
673#endif
674#ifdef CONFIG_MODULES
675 {
676 .procname = "modprobe",
677 .data = &modprobe_path,
678 .maxlen = KMOD_PATH_LEN,
679 .mode = 0644,
680 .proc_handler = proc_dostring,
681 },
682 {
683 .procname = "modules_disabled",
684 .data = &modules_disabled,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 /* only handle a transition from default "0" to "1" */
688 .proc_handler = proc_dointvec_minmax,
689 .extra1 = &one,
690 .extra2 = &one,
691 },
692#endif
693#ifdef CONFIG_UEVENT_HELPER
694 {
695 .procname = "hotplug",
696 .data = &uevent_helper,
697 .maxlen = UEVENT_HELPER_PATH_LEN,
698 .mode = 0644,
699 .proc_handler = proc_dostring,
700 },
701#endif
702#ifdef CONFIG_CHR_DEV_SG
703 {
704 .procname = "sg-big-buff",
705 .data = &sg_big_buff,
706 .maxlen = sizeof (int),
707 .mode = 0444,
708 .proc_handler = proc_dointvec,
709 },
710#endif
711#ifdef CONFIG_BSD_PROCESS_ACCT
712 {
713 .procname = "acct",
714 .data = &acct_parm,
715 .maxlen = 3*sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec,
718 },
719#endif
720#ifdef CONFIG_MAGIC_SYSRQ
721 {
722 .procname = "sysrq",
723 .data = &__sysrq_enabled,
724 .maxlen = sizeof (int),
725 .mode = 0644,
726 .proc_handler = sysrq_sysctl_handler,
727 },
728#endif
729#ifdef CONFIG_PROC_SYSCTL
730 {
731 .procname = "cad_pid",
732 .data = NULL,
733 .maxlen = sizeof (int),
734 .mode = 0600,
735 .proc_handler = proc_do_cad_pid,
736 },
737#endif
738 {
739 .procname = "threads-max",
740 .data = NULL,
741 .maxlen = sizeof(int),
742 .mode = 0644,
743 .proc_handler = sysctl_max_threads,
744 },
745 {
746 .procname = "random",
747 .mode = 0555,
748 .child = random_table,
749 },
750 {
751 .procname = "usermodehelper",
752 .mode = 0555,
753 .child = usermodehelper_table,
754 },
755#ifdef CONFIG_FW_LOADER_USER_HELPER
756 {
757 .procname = "firmware_config",
758 .mode = 0555,
759 .child = firmware_config_table,
760 },
761#endif
762 {
763 .procname = "overflowuid",
764 .data = &overflowuid,
765 .maxlen = sizeof(int),
766 .mode = 0644,
767 .proc_handler = proc_dointvec_minmax,
768 .extra1 = &minolduid,
769 .extra2 = &maxolduid,
770 },
771 {
772 .procname = "overflowgid",
773 .data = &overflowgid,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec_minmax,
777 .extra1 = &minolduid,
778 .extra2 = &maxolduid,
779 },
780#ifdef CONFIG_S390
781#ifdef CONFIG_MATHEMU
782 {
783 .procname = "ieee_emulation_warnings",
784 .data = &sysctl_ieee_emulation_warnings,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec,
788 },
789#endif
790 {
791 .procname = "userprocess_debug",
792 .data = &show_unhandled_signals,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec,
796 },
797#endif
798 {
799 .procname = "pid_max",
800 .data = &pid_max,
801 .maxlen = sizeof (int),
802 .mode = 0644,
803 .proc_handler = proc_dointvec_minmax,
804 .extra1 = &pid_max_min,
805 .extra2 = &pid_max_max,
806 },
807 {
808 .procname = "panic_on_oops",
809 .data = &panic_on_oops,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec,
813 },
814#if defined CONFIG_PRINTK
815 {
816 .procname = "printk",
817 .data = &console_loglevel,
818 .maxlen = 4*sizeof(int),
819 .mode = 0644,
820 .proc_handler = proc_dointvec,
821 },
822 {
823 .procname = "printk_ratelimit",
824 .data = &printk_ratelimit_state.interval,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec_jiffies,
828 },
829 {
830 .procname = "printk_ratelimit_burst",
831 .data = &printk_ratelimit_state.burst,
832 .maxlen = sizeof(int),
833 .mode = 0644,
834 .proc_handler = proc_dointvec,
835 },
836 {
837 .procname = "printk_delay",
838 .data = &printk_delay_msec,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = proc_dointvec_minmax,
842 .extra1 = &zero,
843 .extra2 = &ten_thousand,
844 },
845 {
846 .procname = "printk_devkmsg",
847 .data = devkmsg_log_str,
848 .maxlen = DEVKMSG_STR_MAX_SIZE,
849 .mode = 0644,
850 .proc_handler = devkmsg_sysctl_set_loglvl,
851 },
852 {
853 .procname = "dmesg_restrict",
854 .data = &dmesg_restrict,
855 .maxlen = sizeof(int),
856 .mode = 0644,
857 .proc_handler = proc_dointvec_minmax_sysadmin,
858 .extra1 = &zero,
859 .extra2 = &one,
860 },
861 {
862 .procname = "kptr_restrict",
863 .data = &kptr_restrict,
864 .maxlen = sizeof(int),
865 .mode = 0644,
866 .proc_handler = proc_dointvec_minmax_sysadmin,
867 .extra1 = &zero,
868 .extra2 = &two,
869 },
870#endif
871 {
872 .procname = "ngroups_max",
873 .data = &ngroups_max,
874 .maxlen = sizeof (int),
875 .mode = 0444,
876 .proc_handler = proc_dointvec,
877 },
878 {
879 .procname = "cap_last_cap",
880 .data = (void *)&cap_last_cap,
881 .maxlen = sizeof(int),
882 .mode = 0444,
883 .proc_handler = proc_dointvec,
884 },
885#if defined(CONFIG_LOCKUP_DETECTOR)
886 {
887 .procname = "watchdog",
888 .data = &watchdog_user_enabled,
889 .maxlen = sizeof(int),
890 .mode = 0644,
891 .proc_handler = proc_watchdog,
892 .extra1 = &zero,
893 .extra2 = &one,
894 },
895 {
896 .procname = "watchdog_thresh",
897 .data = &watchdog_thresh,
898 .maxlen = sizeof(int),
899 .mode = 0644,
900 .proc_handler = proc_watchdog_thresh,
901 .extra1 = &zero,
902 .extra2 = &sixty,
903 },
904 {
905 .procname = "nmi_watchdog",
906 .data = &nmi_watchdog_user_enabled,
907 .maxlen = sizeof(int),
908 .mode = NMI_WATCHDOG_SYSCTL_PERM,
909 .proc_handler = proc_nmi_watchdog,
910 .extra1 = &zero,
911 .extra2 = &one,
912 },
913 {
914 .procname = "watchdog_cpumask",
915 .data = &watchdog_cpumask_bits,
916 .maxlen = NR_CPUS,
917 .mode = 0644,
918 .proc_handler = proc_watchdog_cpumask,
919 },
920#ifdef CONFIG_SOFTLOCKUP_DETECTOR
921 {
922 .procname = "soft_watchdog",
923 .data = &soft_watchdog_user_enabled,
924 .maxlen = sizeof(int),
925 .mode = 0644,
926 .proc_handler = proc_soft_watchdog,
927 .extra1 = &zero,
928 .extra2 = &one,
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_SMP
940 {
941 .procname = "softlockup_all_cpu_backtrace",
942 .data = &sysctl_softlockup_all_cpu_backtrace,
943 .maxlen = sizeof(int),
944 .mode = 0644,
945 .proc_handler = proc_dointvec_minmax,
946 .extra1 = &zero,
947 .extra2 = &one,
948 },
949#endif /* CONFIG_SMP */
950#endif
951#ifdef CONFIG_HARDLOCKUP_DETECTOR
952 {
953 .procname = "hardlockup_panic",
954 .data = &hardlockup_panic,
955 .maxlen = sizeof(int),
956 .mode = 0644,
957 .proc_handler = proc_dointvec_minmax,
958 .extra1 = &zero,
959 .extra2 = &one,
960 },
961#ifdef CONFIG_SMP
962 {
963 .procname = "hardlockup_all_cpu_backtrace",
964 .data = &sysctl_hardlockup_all_cpu_backtrace,
965 .maxlen = sizeof(int),
966 .mode = 0644,
967 .proc_handler = proc_dointvec_minmax,
968 .extra1 = &zero,
969 .extra2 = &one,
970 },
971#endif /* CONFIG_SMP */
972#endif
973#endif
974
975#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
976 {
977 .procname = "unknown_nmi_panic",
978 .data = &unknown_nmi_panic,
979 .maxlen = sizeof (int),
980 .mode = 0644,
981 .proc_handler = proc_dointvec,
982 },
983#endif
984#if defined(CONFIG_X86)
985 {
986 .procname = "panic_on_unrecovered_nmi",
987 .data = &panic_on_unrecovered_nmi,
988 .maxlen = sizeof(int),
989 .mode = 0644,
990 .proc_handler = proc_dointvec,
991 },
992 {
993 .procname = "panic_on_io_nmi",
994 .data = &panic_on_io_nmi,
995 .maxlen = sizeof(int),
996 .mode = 0644,
997 .proc_handler = proc_dointvec,
998 },
999#ifdef CONFIG_DEBUG_STACKOVERFLOW
1000 {
1001 .procname = "panic_on_stackoverflow",
1002 .data = &sysctl_panic_on_stackoverflow,
1003 .maxlen = sizeof(int),
1004 .mode = 0644,
1005 .proc_handler = proc_dointvec,
1006 },
1007#endif
1008 {
1009 .procname = "bootloader_type",
1010 .data = &bootloader_type,
1011 .maxlen = sizeof (int),
1012 .mode = 0444,
1013 .proc_handler = proc_dointvec,
1014 },
1015 {
1016 .procname = "bootloader_version",
1017 .data = &bootloader_version,
1018 .maxlen = sizeof (int),
1019 .mode = 0444,
1020 .proc_handler = proc_dointvec,
1021 },
1022 {
1023 .procname = "io_delay_type",
1024 .data = &io_delay_type,
1025 .maxlen = sizeof(int),
1026 .mode = 0644,
1027 .proc_handler = proc_dointvec,
1028 },
1029#endif
1030#if defined(CONFIG_MMU)
1031 {
1032 .procname = "randomize_va_space",
1033 .data = &randomize_va_space,
1034 .maxlen = sizeof(int),
1035 .mode = 0644,
1036 .proc_handler = proc_dointvec,
1037 },
1038#endif
1039#if defined(CONFIG_S390) && defined(CONFIG_SMP)
1040 {
1041 .procname = "spin_retry",
1042 .data = &spin_retry,
1043 .maxlen = sizeof (int),
1044 .mode = 0644,
1045 .proc_handler = proc_dointvec,
1046 },
1047#endif
1048#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1049 {
1050 .procname = "acpi_video_flags",
1051 .data = &acpi_realmode_flags,
1052 .maxlen = sizeof (unsigned long),
1053 .mode = 0644,
1054 .proc_handler = proc_doulongvec_minmax,
1055 },
1056#endif
1057#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1058 {
1059 .procname = "ignore-unaligned-usertrap",
1060 .data = &no_unaligned_warning,
1061 .maxlen = sizeof (int),
1062 .mode = 0644,
1063 .proc_handler = proc_dointvec,
1064 },
1065#endif
1066#ifdef CONFIG_IA64
1067 {
1068 .procname = "unaligned-dump-stack",
1069 .data = &unaligned_dump_stack,
1070 .maxlen = sizeof (int),
1071 .mode = 0644,
1072 .proc_handler = proc_dointvec,
1073 },
1074#endif
1075#ifdef CONFIG_DETECT_HUNG_TASK
1076 {
1077 .procname = "hung_task_panic",
1078 .data = &sysctl_hung_task_panic,
1079 .maxlen = sizeof(int),
1080 .mode = 0644,
1081 .proc_handler = proc_dointvec_minmax,
1082 .extra1 = &zero,
1083 .extra2 = &one,
1084 },
1085 {
1086 .procname = "hung_task_check_count",
1087 .data = &sysctl_hung_task_check_count,
1088 .maxlen = sizeof(int),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec_minmax,
1091 .extra1 = &zero,
1092 },
1093 {
1094 .procname = "hung_task_timeout_secs",
1095 .data = &sysctl_hung_task_timeout_secs,
1096 .maxlen = sizeof(unsigned long),
1097 .mode = 0644,
1098 .proc_handler = proc_dohung_task_timeout_secs,
1099 .extra2 = &hung_task_timeout_max,
1100 },
1101 {
1102 .procname = "hung_task_warnings",
1103 .data = &sysctl_hung_task_warnings,
1104 .maxlen = sizeof(int),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec_minmax,
1107 .extra1 = &neg_one,
1108 },
1109#endif
1110#ifdef CONFIG_RT_MUTEXES
1111 {
1112 .procname = "max_lock_depth",
1113 .data = &max_lock_depth,
1114 .maxlen = sizeof(int),
1115 .mode = 0644,
1116 .proc_handler = proc_dointvec,
1117 },
1118#endif
1119 {
1120 .procname = "poweroff_cmd",
1121 .data = &poweroff_cmd,
1122 .maxlen = POWEROFF_CMD_PATH_LEN,
1123 .mode = 0644,
1124 .proc_handler = proc_dostring,
1125 },
1126#ifdef CONFIG_KEYS
1127 {
1128 .procname = "keys",
1129 .mode = 0555,
1130 .child = key_sysctls,
1131 },
1132#endif
1133#ifdef CONFIG_PERF_EVENTS
1134 /*
1135 * User-space scripts rely on the existence of this file
1136 * as a feature check for perf_events being enabled.
1137 *
1138 * So it's an ABI, do not remove!
1139 */
1140 {
1141 .procname = "perf_event_paranoid",
1142 .data = &sysctl_perf_event_paranoid,
1143 .maxlen = sizeof(sysctl_perf_event_paranoid),
1144 .mode = 0644,
1145 .proc_handler = proc_dointvec,
1146 },
1147 {
1148 .procname = "perf_event_mlock_kb",
1149 .data = &sysctl_perf_event_mlock,
1150 .maxlen = sizeof(sysctl_perf_event_mlock),
1151 .mode = 0644,
1152 .proc_handler = proc_dointvec,
1153 },
1154 {
1155 .procname = "perf_event_max_sample_rate",
1156 .data = &sysctl_perf_event_sample_rate,
1157 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1158 .mode = 0644,
1159 .proc_handler = perf_proc_update_handler,
1160 .extra1 = &one,
1161 },
1162 {
1163 .procname = "perf_cpu_time_max_percent",
1164 .data = &sysctl_perf_cpu_time_max_percent,
1165 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1166 .mode = 0644,
1167 .proc_handler = perf_cpu_time_max_percent_handler,
1168 .extra1 = &zero,
1169 .extra2 = &one_hundred,
1170 },
1171 {
1172 .procname = "perf_event_max_stack",
1173 .data = &sysctl_perf_event_max_stack,
1174 .maxlen = sizeof(sysctl_perf_event_max_stack),
1175 .mode = 0644,
1176 .proc_handler = perf_event_max_stack_handler,
1177 .extra1 = &zero,
1178 .extra2 = &six_hundred_forty_kb,
1179 },
1180 {
1181 .procname = "perf_event_max_contexts_per_stack",
1182 .data = &sysctl_perf_event_max_contexts_per_stack,
1183 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1184 .mode = 0644,
1185 .proc_handler = perf_event_max_stack_handler,
1186 .extra1 = &zero,
1187 .extra2 = &one_thousand,
1188 },
1189#endif
1190 {
1191 .procname = "panic_on_warn",
1192 .data = &panic_on_warn,
1193 .maxlen = sizeof(int),
1194 .mode = 0644,
1195 .proc_handler = proc_dointvec_minmax,
1196 .extra1 = &zero,
1197 .extra2 = &one,
1198 },
1199#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1200 {
1201 .procname = "timer_migration",
1202 .data = &sysctl_timer_migration,
1203 .maxlen = sizeof(unsigned int),
1204 .mode = 0644,
1205 .proc_handler = timer_migration_handler,
1206 .extra1 = &zero,
1207 .extra2 = &one,
1208 },
1209#endif
1210#ifdef CONFIG_BPF_SYSCALL
1211 {
1212 .procname = "unprivileged_bpf_disabled",
1213 .data = &sysctl_unprivileged_bpf_disabled,
1214 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1215 .mode = 0644,
1216 /* only handle a transition from default "0" to "1" */
1217 .proc_handler = proc_dointvec_minmax,
1218 .extra1 = &one,
1219 .extra2 = &one,
1220 },
1221#endif
1222#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1223 {
1224 .procname = "panic_on_rcu_stall",
1225 .data = &sysctl_panic_on_rcu_stall,
1226 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1227 .mode = 0644,
1228 .proc_handler = proc_dointvec_minmax,
1229 .extra1 = &zero,
1230 .extra2 = &one,
1231 },
1232#endif
1233 { }
1234};
1235
1236static struct ctl_table vm_table[] = {
1237 {
1238 .procname = "overcommit_memory",
1239 .data = &sysctl_overcommit_memory,
1240 .maxlen = sizeof(sysctl_overcommit_memory),
1241 .mode = 0644,
1242 .proc_handler = proc_dointvec_minmax,
1243 .extra1 = &zero,
1244 .extra2 = &two,
1245 },
1246 {
1247 .procname = "panic_on_oom",
1248 .data = &sysctl_panic_on_oom,
1249 .maxlen = sizeof(sysctl_panic_on_oom),
1250 .mode = 0644,
1251 .proc_handler = proc_dointvec_minmax,
1252 .extra1 = &zero,
1253 .extra2 = &two,
1254 },
1255 {
1256 .procname = "oom_kill_allocating_task",
1257 .data = &sysctl_oom_kill_allocating_task,
1258 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1259 .mode = 0644,
1260 .proc_handler = proc_dointvec,
1261 },
1262 {
1263 .procname = "oom_dump_tasks",
1264 .data = &sysctl_oom_dump_tasks,
1265 .maxlen = sizeof(sysctl_oom_dump_tasks),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec,
1268 },
1269 {
1270 .procname = "overcommit_ratio",
1271 .data = &sysctl_overcommit_ratio,
1272 .maxlen = sizeof(sysctl_overcommit_ratio),
1273 .mode = 0644,
1274 .proc_handler = overcommit_ratio_handler,
1275 },
1276 {
1277 .procname = "overcommit_kbytes",
1278 .data = &sysctl_overcommit_kbytes,
1279 .maxlen = sizeof(sysctl_overcommit_kbytes),
1280 .mode = 0644,
1281 .proc_handler = overcommit_kbytes_handler,
1282 },
1283 {
1284 .procname = "page-cluster",
1285 .data = &page_cluster,
1286 .maxlen = sizeof(int),
1287 .mode = 0644,
1288 .proc_handler = proc_dointvec_minmax,
1289 .extra1 = &zero,
1290 },
1291 {
1292 .procname = "dirty_background_ratio",
1293 .data = &dirty_background_ratio,
1294 .maxlen = sizeof(dirty_background_ratio),
1295 .mode = 0644,
1296 .proc_handler = dirty_background_ratio_handler,
1297 .extra1 = &zero,
1298 .extra2 = &one_hundred,
1299 },
1300 {
1301 .procname = "dirty_background_bytes",
1302 .data = &dirty_background_bytes,
1303 .maxlen = sizeof(dirty_background_bytes),
1304 .mode = 0644,
1305 .proc_handler = dirty_background_bytes_handler,
1306 .extra1 = &one_ul,
1307 },
1308 {
1309 .procname = "dirty_ratio",
1310 .data = &vm_dirty_ratio,
1311 .maxlen = sizeof(vm_dirty_ratio),
1312 .mode = 0644,
1313 .proc_handler = dirty_ratio_handler,
1314 .extra1 = &zero,
1315 .extra2 = &one_hundred,
1316 },
1317 {
1318 .procname = "dirty_bytes",
1319 .data = &vm_dirty_bytes,
1320 .maxlen = sizeof(vm_dirty_bytes),
1321 .mode = 0644,
1322 .proc_handler = dirty_bytes_handler,
1323 .extra1 = &dirty_bytes_min,
1324 },
1325 {
1326 .procname = "dirty_writeback_centisecs",
1327 .data = &dirty_writeback_interval,
1328 .maxlen = sizeof(dirty_writeback_interval),
1329 .mode = 0644,
1330 .proc_handler = dirty_writeback_centisecs_handler,
1331 },
1332 {
1333 .procname = "dirty_expire_centisecs",
1334 .data = &dirty_expire_interval,
1335 .maxlen = sizeof(dirty_expire_interval),
1336 .mode = 0644,
1337 .proc_handler = proc_dointvec_minmax,
1338 .extra1 = &zero,
1339 },
1340 {
1341 .procname = "dirtytime_expire_seconds",
1342 .data = &dirtytime_expire_interval,
1343 .maxlen = sizeof(dirtytime_expire_interval),
1344 .mode = 0644,
1345 .proc_handler = dirtytime_interval_handler,
1346 .extra1 = &zero,
1347 },
1348 {
1349 .procname = "swappiness",
1350 .data = &vm_swappiness,
1351 .maxlen = sizeof(vm_swappiness),
1352 .mode = 0644,
1353 .proc_handler = proc_dointvec_minmax,
1354 .extra1 = &zero,
1355 .extra2 = &one_hundred,
1356 },
1357#ifdef CONFIG_HUGETLB_PAGE
1358 {
1359 .procname = "nr_hugepages",
1360 .data = NULL,
1361 .maxlen = sizeof(unsigned long),
1362 .mode = 0644,
1363 .proc_handler = hugetlb_sysctl_handler,
1364 },
1365#ifdef CONFIG_NUMA
1366 {
1367 .procname = "nr_hugepages_mempolicy",
1368 .data = NULL,
1369 .maxlen = sizeof(unsigned long),
1370 .mode = 0644,
1371 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1372 },
1373 {
1374 .procname = "numa_stat",
1375 .data = &sysctl_vm_numa_stat,
1376 .maxlen = sizeof(int),
1377 .mode = 0644,
1378 .proc_handler = sysctl_vm_numa_stat_handler,
1379 .extra1 = &zero,
1380 .extra2 = &one,
1381 },
1382#endif
1383 {
1384 .procname = "hugetlb_shm_group",
1385 .data = &sysctl_hugetlb_shm_group,
1386 .maxlen = sizeof(gid_t),
1387 .mode = 0644,
1388 .proc_handler = proc_dointvec,
1389 },
1390 {
1391 .procname = "nr_overcommit_hugepages",
1392 .data = NULL,
1393 .maxlen = sizeof(unsigned long),
1394 .mode = 0644,
1395 .proc_handler = hugetlb_overcommit_handler,
1396 },
1397#endif
1398 {
1399 .procname = "lowmem_reserve_ratio",
1400 .data = &sysctl_lowmem_reserve_ratio,
1401 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1402 .mode = 0644,
1403 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1404 },
1405 {
1406 .procname = "drop_caches",
1407 .data = &sysctl_drop_caches,
1408 .maxlen = sizeof(int),
1409 .mode = 0644,
1410 .proc_handler = drop_caches_sysctl_handler,
1411 .extra1 = &one,
1412 .extra2 = &four,
1413 },
1414#ifdef CONFIG_COMPACTION
1415 {
1416 .procname = "compact_memory",
1417 .data = &sysctl_compact_memory,
1418 .maxlen = sizeof(int),
1419 .mode = 0200,
1420 .proc_handler = sysctl_compaction_handler,
1421 },
1422 {
1423 .procname = "extfrag_threshold",
1424 .data = &sysctl_extfrag_threshold,
1425 .maxlen = sizeof(int),
1426 .mode = 0644,
1427 .proc_handler = sysctl_extfrag_handler,
1428 .extra1 = &min_extfrag_threshold,
1429 .extra2 = &max_extfrag_threshold,
1430 },
1431 {
1432 .procname = "compact_unevictable_allowed",
1433 .data = &sysctl_compact_unevictable_allowed,
1434 .maxlen = sizeof(int),
1435 .mode = 0644,
1436 .proc_handler = proc_dointvec,
1437 .extra1 = &zero,
1438 .extra2 = &one,
1439 },
1440
1441#endif /* CONFIG_COMPACTION */
1442 {
1443 .procname = "min_free_kbytes",
1444 .data = &min_free_kbytes,
1445 .maxlen = sizeof(min_free_kbytes),
1446 .mode = 0644,
1447 .proc_handler = min_free_kbytes_sysctl_handler,
1448 .extra1 = &zero,
1449 },
1450 {
1451 .procname = "watermark_scale_factor",
1452 .data = &watermark_scale_factor,
1453 .maxlen = sizeof(watermark_scale_factor),
1454 .mode = 0644,
1455 .proc_handler = watermark_scale_factor_sysctl_handler,
1456 .extra1 = &one,
1457 .extra2 = &one_thousand,
1458 },
1459 {
1460 .procname = "percpu_pagelist_fraction",
1461 .data = &percpu_pagelist_fraction,
1462 .maxlen = sizeof(percpu_pagelist_fraction),
1463 .mode = 0644,
1464 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1465 .extra1 = &zero,
1466 },
1467#ifdef CONFIG_MMU
1468 {
1469 .procname = "max_map_count",
1470 .data = &sysctl_max_map_count,
1471 .maxlen = sizeof(sysctl_max_map_count),
1472 .mode = 0644,
1473 .proc_handler = proc_dointvec_minmax,
1474 .extra1 = &zero,
1475 },
1476#else
1477 {
1478 .procname = "nr_trim_pages",
1479 .data = &sysctl_nr_trim_pages,
1480 .maxlen = sizeof(sysctl_nr_trim_pages),
1481 .mode = 0644,
1482 .proc_handler = proc_dointvec_minmax,
1483 .extra1 = &zero,
1484 },
1485#endif
1486 {
1487 .procname = "laptop_mode",
1488 .data = &laptop_mode,
1489 .maxlen = sizeof(laptop_mode),
1490 .mode = 0644,
1491 .proc_handler = proc_dointvec_jiffies,
1492 },
1493 {
1494 .procname = "block_dump",
1495 .data = &block_dump,
1496 .maxlen = sizeof(block_dump),
1497 .mode = 0644,
1498 .proc_handler = proc_dointvec,
1499 .extra1 = &zero,
1500 },
1501 {
1502 .procname = "vfs_cache_pressure",
1503 .data = &sysctl_vfs_cache_pressure,
1504 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1505 .mode = 0644,
1506 .proc_handler = proc_dointvec,
1507 .extra1 = &zero,
1508 },
1509#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1510 {
1511 .procname = "legacy_va_layout",
1512 .data = &sysctl_legacy_va_layout,
1513 .maxlen = sizeof(sysctl_legacy_va_layout),
1514 .mode = 0644,
1515 .proc_handler = proc_dointvec,
1516 .extra1 = &zero,
1517 },
1518#endif
1519#ifdef CONFIG_NUMA
1520 {
1521 .procname = "zone_reclaim_mode",
1522 .data = &node_reclaim_mode,
1523 .maxlen = sizeof(node_reclaim_mode),
1524 .mode = 0644,
1525 .proc_handler = proc_dointvec,
1526 .extra1 = &zero,
1527 },
1528 {
1529 .procname = "min_unmapped_ratio",
1530 .data = &sysctl_min_unmapped_ratio,
1531 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1532 .mode = 0644,
1533 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1534 .extra1 = &zero,
1535 .extra2 = &one_hundred,
1536 },
1537 {
1538 .procname = "min_slab_ratio",
1539 .data = &sysctl_min_slab_ratio,
1540 .maxlen = sizeof(sysctl_min_slab_ratio),
1541 .mode = 0644,
1542 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1543 .extra1 = &zero,
1544 .extra2 = &one_hundred,
1545 },
1546#endif
1547#ifdef CONFIG_SMP
1548 {
1549 .procname = "stat_interval",
1550 .data = &sysctl_stat_interval,
1551 .maxlen = sizeof(sysctl_stat_interval),
1552 .mode = 0644,
1553 .proc_handler = proc_dointvec_jiffies,
1554 },
1555 {
1556 .procname = "stat_refresh",
1557 .data = NULL,
1558 .maxlen = 0,
1559 .mode = 0600,
1560 .proc_handler = vmstat_refresh,
1561 },
1562#endif
1563#ifdef CONFIG_MMU
1564 {
1565 .procname = "mmap_min_addr",
1566 .data = &dac_mmap_min_addr,
1567 .maxlen = sizeof(unsigned long),
1568 .mode = 0644,
1569 .proc_handler = mmap_min_addr_handler,
1570 },
1571#endif
1572#ifdef CONFIG_NUMA
1573 {
1574 .procname = "numa_zonelist_order",
1575 .data = &numa_zonelist_order,
1576 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1577 .mode = 0644,
1578 .proc_handler = numa_zonelist_order_handler,
1579 },
1580#endif
1581#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1582 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1583 {
1584 .procname = "vdso_enabled",
1585#ifdef CONFIG_X86_32
1586 .data = &vdso32_enabled,
1587 .maxlen = sizeof(vdso32_enabled),
1588#else
1589 .data = &vdso_enabled,
1590 .maxlen = sizeof(vdso_enabled),
1591#endif
1592 .mode = 0644,
1593 .proc_handler = proc_dointvec,
1594 .extra1 = &zero,
1595 },
1596#endif
1597#ifdef CONFIG_HIGHMEM
1598 {
1599 .procname = "highmem_is_dirtyable",
1600 .data = &vm_highmem_is_dirtyable,
1601 .maxlen = sizeof(vm_highmem_is_dirtyable),
1602 .mode = 0644,
1603 .proc_handler = proc_dointvec_minmax,
1604 .extra1 = &zero,
1605 .extra2 = &one,
1606 },
1607#endif
1608#ifdef CONFIG_MEMORY_FAILURE
1609 {
1610 .procname = "memory_failure_early_kill",
1611 .data = &sysctl_memory_failure_early_kill,
1612 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1613 .mode = 0644,
1614 .proc_handler = proc_dointvec_minmax,
1615 .extra1 = &zero,
1616 .extra2 = &one,
1617 },
1618 {
1619 .procname = "memory_failure_recovery",
1620 .data = &sysctl_memory_failure_recovery,
1621 .maxlen = sizeof(sysctl_memory_failure_recovery),
1622 .mode = 0644,
1623 .proc_handler = proc_dointvec_minmax,
1624 .extra1 = &zero,
1625 .extra2 = &one,
1626 },
1627#endif
1628 {
1629 .procname = "user_reserve_kbytes",
1630 .data = &sysctl_user_reserve_kbytes,
1631 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1632 .mode = 0644,
1633 .proc_handler = proc_doulongvec_minmax,
1634 },
1635 {
1636 .procname = "admin_reserve_kbytes",
1637 .data = &sysctl_admin_reserve_kbytes,
1638 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1639 .mode = 0644,
1640 .proc_handler = proc_doulongvec_minmax,
1641 },
1642#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1643 {
1644 .procname = "mmap_rnd_bits",
1645 .data = &mmap_rnd_bits,
1646 .maxlen = sizeof(mmap_rnd_bits),
1647 .mode = 0600,
1648 .proc_handler = proc_dointvec_minmax,
1649 .extra1 = (void *)&mmap_rnd_bits_min,
1650 .extra2 = (void *)&mmap_rnd_bits_max,
1651 },
1652#endif
1653#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1654 {
1655 .procname = "mmap_rnd_compat_bits",
1656 .data = &mmap_rnd_compat_bits,
1657 .maxlen = sizeof(mmap_rnd_compat_bits),
1658 .mode = 0600,
1659 .proc_handler = proc_dointvec_minmax,
1660 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1661 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1662 },
1663#endif
1664 { }
1665};
1666
1667static struct ctl_table fs_table[] = {
1668 {
1669 .procname = "inode-nr",
1670 .data = &inodes_stat,
1671 .maxlen = 2*sizeof(long),
1672 .mode = 0444,
1673 .proc_handler = proc_nr_inodes,
1674 },
1675 {
1676 .procname = "inode-state",
1677 .data = &inodes_stat,
1678 .maxlen = 7*sizeof(long),
1679 .mode = 0444,
1680 .proc_handler = proc_nr_inodes,
1681 },
1682 {
1683 .procname = "file-nr",
1684 .data = &files_stat,
1685 .maxlen = sizeof(files_stat),
1686 .mode = 0444,
1687 .proc_handler = proc_nr_files,
1688 },
1689 {
1690 .procname = "file-max",
1691 .data = &files_stat.max_files,
1692 .maxlen = sizeof(files_stat.max_files),
1693 .mode = 0644,
1694 .proc_handler = proc_doulongvec_minmax,
1695 },
1696 {
1697 .procname = "nr_open",
1698 .data = &sysctl_nr_open,
1699 .maxlen = sizeof(unsigned int),
1700 .mode = 0644,
1701 .proc_handler = proc_dointvec_minmax,
1702 .extra1 = &sysctl_nr_open_min,
1703 .extra2 = &sysctl_nr_open_max,
1704 },
1705 {
1706 .procname = "dentry-state",
1707 .data = &dentry_stat,
1708 .maxlen = 6*sizeof(long),
1709 .mode = 0444,
1710 .proc_handler = proc_nr_dentry,
1711 },
1712 {
1713 .procname = "overflowuid",
1714 .data = &fs_overflowuid,
1715 .maxlen = sizeof(int),
1716 .mode = 0644,
1717 .proc_handler = proc_dointvec_minmax,
1718 .extra1 = &minolduid,
1719 .extra2 = &maxolduid,
1720 },
1721 {
1722 .procname = "overflowgid",
1723 .data = &fs_overflowgid,
1724 .maxlen = sizeof(int),
1725 .mode = 0644,
1726 .proc_handler = proc_dointvec_minmax,
1727 .extra1 = &minolduid,
1728 .extra2 = &maxolduid,
1729 },
1730#ifdef CONFIG_FILE_LOCKING
1731 {
1732 .procname = "leases-enable",
1733 .data = &leases_enable,
1734 .maxlen = sizeof(int),
1735 .mode = 0644,
1736 .proc_handler = proc_dointvec,
1737 },
1738#endif
1739#ifdef CONFIG_DNOTIFY
1740 {
1741 .procname = "dir-notify-enable",
1742 .data = &dir_notify_enable,
1743 .maxlen = sizeof(int),
1744 .mode = 0644,
1745 .proc_handler = proc_dointvec,
1746 },
1747#endif
1748#ifdef CONFIG_MMU
1749#ifdef CONFIG_FILE_LOCKING
1750 {
1751 .procname = "lease-break-time",
1752 .data = &lease_break_time,
1753 .maxlen = sizeof(int),
1754 .mode = 0644,
1755 .proc_handler = proc_dointvec,
1756 },
1757#endif
1758#ifdef CONFIG_AIO
1759 {
1760 .procname = "aio-nr",
1761 .data = &aio_nr,
1762 .maxlen = sizeof(aio_nr),
1763 .mode = 0444,
1764 .proc_handler = proc_doulongvec_minmax,
1765 },
1766 {
1767 .procname = "aio-max-nr",
1768 .data = &aio_max_nr,
1769 .maxlen = sizeof(aio_max_nr),
1770 .mode = 0644,
1771 .proc_handler = proc_doulongvec_minmax,
1772 },
1773#endif /* CONFIG_AIO */
1774#ifdef CONFIG_INOTIFY_USER
1775 {
1776 .procname = "inotify",
1777 .mode = 0555,
1778 .child = inotify_table,
1779 },
1780#endif
1781#ifdef CONFIG_EPOLL
1782 {
1783 .procname = "epoll",
1784 .mode = 0555,
1785 .child = epoll_table,
1786 },
1787#endif
1788#endif
1789 {
1790 .procname = "protected_symlinks",
1791 .data = &sysctl_protected_symlinks,
1792 .maxlen = sizeof(int),
1793 .mode = 0600,
1794 .proc_handler = proc_dointvec_minmax,
1795 .extra1 = &zero,
1796 .extra2 = &one,
1797 },
1798 {
1799 .procname = "protected_hardlinks",
1800 .data = &sysctl_protected_hardlinks,
1801 .maxlen = sizeof(int),
1802 .mode = 0600,
1803 .proc_handler = proc_dointvec_minmax,
1804 .extra1 = &zero,
1805 .extra2 = &one,
1806 },
1807 {
1808 .procname = "suid_dumpable",
1809 .data = &suid_dumpable,
1810 .maxlen = sizeof(int),
1811 .mode = 0644,
1812 .proc_handler = proc_dointvec_minmax_coredump,
1813 .extra1 = &zero,
1814 .extra2 = &two,
1815 },
1816#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1817 {
1818 .procname = "binfmt_misc",
1819 .mode = 0555,
1820 .child = sysctl_mount_point,
1821 },
1822#endif
1823 {
1824 .procname = "pipe-max-size",
1825 .data = &pipe_max_size,
1826 .maxlen = sizeof(pipe_max_size),
1827 .mode = 0644,
1828 .proc_handler = proc_dopipe_max_size,
1829 },
1830 {
1831 .procname = "pipe-user-pages-hard",
1832 .data = &pipe_user_pages_hard,
1833 .maxlen = sizeof(pipe_user_pages_hard),
1834 .mode = 0644,
1835 .proc_handler = proc_doulongvec_minmax,
1836 },
1837 {
1838 .procname = "pipe-user-pages-soft",
1839 .data = &pipe_user_pages_soft,
1840 .maxlen = sizeof(pipe_user_pages_soft),
1841 .mode = 0644,
1842 .proc_handler = proc_doulongvec_minmax,
1843 },
1844 {
1845 .procname = "mount-max",
1846 .data = &sysctl_mount_max,
1847 .maxlen = sizeof(unsigned int),
1848 .mode = 0644,
1849 .proc_handler = proc_dointvec_minmax,
1850 .extra1 = &one,
1851 },
1852 { }
1853};
1854
1855static struct ctl_table debug_table[] = {
1856#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1857 {
1858 .procname = "exception-trace",
1859 .data = &show_unhandled_signals,
1860 .maxlen = sizeof(int),
1861 .mode = 0644,
1862 .proc_handler = proc_dointvec
1863 },
1864#endif
1865#if defined(CONFIG_OPTPROBES)
1866 {
1867 .procname = "kprobes-optimization",
1868 .data = &sysctl_kprobes_optimization,
1869 .maxlen = sizeof(int),
1870 .mode = 0644,
1871 .proc_handler = proc_kprobes_optimization_handler,
1872 .extra1 = &zero,
1873 .extra2 = &one,
1874 },
1875#endif
1876 { }
1877};
1878
1879static struct ctl_table dev_table[] = {
1880 { }
1881};
1882
1883int __init sysctl_init(void)
1884{
1885 struct ctl_table_header *hdr;
1886
1887 hdr = register_sysctl_table(sysctl_base_table);
1888 kmemleak_not_leak(hdr);
1889 return 0;
1890}
1891
1892#endif /* CONFIG_SYSCTL */
1893
1894/*
1895 * /proc/sys support
1896 */
1897
1898#ifdef CONFIG_PROC_SYSCTL
1899
1900static int _proc_do_string(char *data, int maxlen, int write,
1901 char __user *buffer,
1902 size_t *lenp, loff_t *ppos)
1903{
1904 size_t len;
1905 char __user *p;
1906 char c;
1907
1908 if (!data || !maxlen || !*lenp) {
1909 *lenp = 0;
1910 return 0;
1911 }
1912
1913 if (write) {
1914 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1915 /* Only continue writes not past the end of buffer. */
1916 len = strlen(data);
1917 if (len > maxlen - 1)
1918 len = maxlen - 1;
1919
1920 if (*ppos > len)
1921 return 0;
1922 len = *ppos;
1923 } else {
1924 /* Start writing from beginning of buffer. */
1925 len = 0;
1926 }
1927
1928 *ppos += *lenp;
1929 p = buffer;
1930 while ((p - buffer) < *lenp && len < maxlen - 1) {
1931 if (get_user(c, p++))
1932 return -EFAULT;
1933 if (c == 0 || c == '\n')
1934 break;
1935 data[len++] = c;
1936 }
1937 data[len] = 0;
1938 } else {
1939 len = strlen(data);
1940 if (len > maxlen)
1941 len = maxlen;
1942
1943 if (*ppos > len) {
1944 *lenp = 0;
1945 return 0;
1946 }
1947
1948 data += *ppos;
1949 len -= *ppos;
1950
1951 if (len > *lenp)
1952 len = *lenp;
1953 if (len)
1954 if (copy_to_user(buffer, data, len))
1955 return -EFAULT;
1956 if (len < *lenp) {
1957 if (put_user('\n', buffer + len))
1958 return -EFAULT;
1959 len++;
1960 }
1961 *lenp = len;
1962 *ppos += len;
1963 }
1964 return 0;
1965}
1966
1967static void warn_sysctl_write(struct ctl_table *table)
1968{
1969 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1970 "This will not be supported in the future. To silence this\n"
1971 "warning, set kernel.sysctl_writes_strict = -1\n",
1972 current->comm, table->procname);
1973}
1974
1975/**
1976 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1977 * @ppos: file position
1978 * @table: the sysctl table
1979 *
1980 * Returns true if the first position is non-zero and the sysctl_writes_strict
1981 * mode indicates this is not allowed for numeric input types. String proc
1982 * hadlers can ignore the return value.
1983 */
1984static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1985 struct ctl_table *table)
1986{
1987 if (!*ppos)
1988 return false;
1989
1990 switch (sysctl_writes_strict) {
1991 case SYSCTL_WRITES_STRICT:
1992 return true;
1993 case SYSCTL_WRITES_WARN:
1994 warn_sysctl_write(table);
1995 return false;
1996 default:
1997 return false;
1998 }
1999}
2000
2001/**
2002 * proc_dostring - read a string sysctl
2003 * @table: the sysctl table
2004 * @write: %TRUE if this is a write to the sysctl file
2005 * @buffer: the user buffer
2006 * @lenp: the size of the user buffer
2007 * @ppos: file position
2008 *
2009 * Reads/writes a string from/to the user buffer. If the kernel
2010 * buffer provided is not large enough to hold the string, the
2011 * string is truncated. The copied string is %NULL-terminated.
2012 * If the string is being read by the user process, it is copied
2013 * and a newline '\n' is added. It is truncated if the buffer is
2014 * not large enough.
2015 *
2016 * Returns 0 on success.
2017 */
2018int proc_dostring(struct ctl_table *table, int write,
2019 void __user *buffer, size_t *lenp, loff_t *ppos)
2020{
2021 if (write)
2022 proc_first_pos_non_zero_ignore(ppos, table);
2023
2024 return _proc_do_string((char *)(table->data), table->maxlen, write,
2025 (char __user *)buffer, lenp, ppos);
2026}
2027
2028static size_t proc_skip_spaces(char **buf)
2029{
2030 size_t ret;
2031 char *tmp = skip_spaces(*buf);
2032 ret = tmp - *buf;
2033 *buf = tmp;
2034 return ret;
2035}
2036
2037static void proc_skip_char(char **buf, size_t *size, const char v)
2038{
2039 while (*size) {
2040 if (**buf != v)
2041 break;
2042 (*size)--;
2043 (*buf)++;
2044 }
2045}
2046
2047#define TMPBUFLEN 22
2048/**
2049 * proc_get_long - reads an ASCII formatted integer from a user buffer
2050 *
2051 * @buf: a kernel buffer
2052 * @size: size of the kernel buffer
2053 * @val: this is where the number will be stored
2054 * @neg: set to %TRUE if number is negative
2055 * @perm_tr: a vector which contains the allowed trailers
2056 * @perm_tr_len: size of the perm_tr vector
2057 * @tr: pointer to store the trailer character
2058 *
2059 * In case of success %0 is returned and @buf and @size are updated with
2060 * the amount of bytes read. If @tr is non-NULL and a trailing
2061 * character exists (size is non-zero after returning from this
2062 * function), @tr is updated with the trailing character.
2063 */
2064static int proc_get_long(char **buf, size_t *size,
2065 unsigned long *val, bool *neg,
2066 const char *perm_tr, unsigned perm_tr_len, char *tr)
2067{
2068 int len;
2069 char *p, tmp[TMPBUFLEN];
2070
2071 if (!*size)
2072 return -EINVAL;
2073
2074 len = *size;
2075 if (len > TMPBUFLEN - 1)
2076 len = TMPBUFLEN - 1;
2077
2078 memcpy(tmp, *buf, len);
2079
2080 tmp[len] = 0;
2081 p = tmp;
2082 if (*p == '-' && *size > 1) {
2083 *neg = true;
2084 p++;
2085 } else
2086 *neg = false;
2087 if (!isdigit(*p))
2088 return -EINVAL;
2089
2090 *val = simple_strtoul(p, &p, 0);
2091
2092 len = p - tmp;
2093
2094 /* We don't know if the next char is whitespace thus we may accept
2095 * invalid integers (e.g. 1234...a) or two integers instead of one
2096 * (e.g. 123...1). So lets not allow such large numbers. */
2097 if (len == TMPBUFLEN - 1)
2098 return -EINVAL;
2099
2100 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2101 return -EINVAL;
2102
2103 if (tr && (len < *size))
2104 *tr = *p;
2105
2106 *buf += len;
2107 *size -= len;
2108
2109 return 0;
2110}
2111
2112/**
2113 * proc_put_long - converts an integer to a decimal ASCII formatted string
2114 *
2115 * @buf: the user buffer
2116 * @size: the size of the user buffer
2117 * @val: the integer to be converted
2118 * @neg: sign of the number, %TRUE for negative
2119 *
2120 * In case of success %0 is returned and @buf and @size are updated with
2121 * the amount of bytes written.
2122 */
2123static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2124 bool neg)
2125{
2126 int len;
2127 char tmp[TMPBUFLEN], *p = tmp;
2128
2129 sprintf(p, "%s%lu", neg ? "-" : "", val);
2130 len = strlen(tmp);
2131 if (len > *size)
2132 len = *size;
2133 if (copy_to_user(*buf, tmp, len))
2134 return -EFAULT;
2135 *size -= len;
2136 *buf += len;
2137 return 0;
2138}
2139#undef TMPBUFLEN
2140
2141static int proc_put_char(void __user **buf, size_t *size, char c)
2142{
2143 if (*size) {
2144 char __user **buffer = (char __user **)buf;
2145 if (put_user(c, *buffer))
2146 return -EFAULT;
2147 (*size)--, (*buffer)++;
2148 *buf = *buffer;
2149 }
2150 return 0;
2151}
2152
2153static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2154 int *valp,
2155 int write, void *data)
2156{
2157 if (write) {
2158 if (*negp) {
2159 if (*lvalp > (unsigned long) INT_MAX + 1)
2160 return -EINVAL;
2161 *valp = -*lvalp;
2162 } else {
2163 if (*lvalp > (unsigned long) INT_MAX)
2164 return -EINVAL;
2165 *valp = *lvalp;
2166 }
2167 } else {
2168 int val = *valp;
2169 if (val < 0) {
2170 *negp = true;
2171 *lvalp = -(unsigned long)val;
2172 } else {
2173 *negp = false;
2174 *lvalp = (unsigned long)val;
2175 }
2176 }
2177 return 0;
2178}
2179
2180static int do_proc_douintvec_conv(unsigned long *lvalp,
2181 unsigned int *valp,
2182 int write, void *data)
2183{
2184 if (write) {
2185 if (*lvalp > UINT_MAX)
2186 return -EINVAL;
2187 *valp = *lvalp;
2188 } else {
2189 unsigned int val = *valp;
2190 *lvalp = (unsigned long)val;
2191 }
2192 return 0;
2193}
2194
2195static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2196
2197static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2198 int write, void __user *buffer,
2199 size_t *lenp, loff_t *ppos,
2200 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2201 int write, void *data),
2202 void *data)
2203{
2204 int *i, vleft, first = 1, err = 0;
2205 size_t left;
2206 char *kbuf = NULL, *p;
2207
2208 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2209 *lenp = 0;
2210 return 0;
2211 }
2212
2213 i = (int *) tbl_data;
2214 vleft = table->maxlen / sizeof(*i);
2215 left = *lenp;
2216
2217 if (!conv)
2218 conv = do_proc_dointvec_conv;
2219
2220 if (write) {
2221 if (proc_first_pos_non_zero_ignore(ppos, table))
2222 goto out;
2223
2224 if (left > PAGE_SIZE - 1)
2225 left = PAGE_SIZE - 1;
2226 p = kbuf = memdup_user_nul(buffer, left);
2227 if (IS_ERR(kbuf))
2228 return PTR_ERR(kbuf);
2229 }
2230
2231 for (; left && vleft--; i++, first=0) {
2232 unsigned long lval;
2233 bool neg;
2234
2235 if (write) {
2236 left -= proc_skip_spaces(&p);
2237
2238 if (!left)
2239 break;
2240 err = proc_get_long(&p, &left, &lval, &neg,
2241 proc_wspace_sep,
2242 sizeof(proc_wspace_sep), NULL);
2243 if (err)
2244 break;
2245 if (conv(&neg, &lval, i, 1, data)) {
2246 err = -EINVAL;
2247 break;
2248 }
2249 } else {
2250 if (conv(&neg, &lval, i, 0, data)) {
2251 err = -EINVAL;
2252 break;
2253 }
2254 if (!first)
2255 err = proc_put_char(&buffer, &left, '\t');
2256 if (err)
2257 break;
2258 err = proc_put_long(&buffer, &left, lval, neg);
2259 if (err)
2260 break;
2261 }
2262 }
2263
2264 if (!write && !first && left && !err)
2265 err = proc_put_char(&buffer, &left, '\n');
2266 if (write && !err && left)
2267 left -= proc_skip_spaces(&p);
2268 if (write) {
2269 kfree(kbuf);
2270 if (first)
2271 return err ? : -EINVAL;
2272 }
2273 *lenp -= left;
2274out:
2275 *ppos += *lenp;
2276 return err;
2277}
2278
2279static int do_proc_dointvec(struct ctl_table *table, int write,
2280 void __user *buffer, size_t *lenp, loff_t *ppos,
2281 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2282 int write, void *data),
2283 void *data)
2284{
2285 return __do_proc_dointvec(table->data, table, write,
2286 buffer, lenp, ppos, conv, data);
2287}
2288
2289static int do_proc_douintvec_w(unsigned int *tbl_data,
2290 struct ctl_table *table,
2291 void __user *buffer,
2292 size_t *lenp, loff_t *ppos,
2293 int (*conv)(unsigned long *lvalp,
2294 unsigned int *valp,
2295 int write, void *data),
2296 void *data)
2297{
2298 unsigned long lval;
2299 int err = 0;
2300 size_t left;
2301 bool neg;
2302 char *kbuf = NULL, *p;
2303
2304 left = *lenp;
2305
2306 if (proc_first_pos_non_zero_ignore(ppos, table))
2307 goto bail_early;
2308
2309 if (left > PAGE_SIZE - 1)
2310 left = PAGE_SIZE - 1;
2311
2312 p = kbuf = memdup_user_nul(buffer, left);
2313 if (IS_ERR(kbuf))
2314 return -EINVAL;
2315
2316 left -= proc_skip_spaces(&p);
2317 if (!left) {
2318 err = -EINVAL;
2319 goto out_free;
2320 }
2321
2322 err = proc_get_long(&p, &left, &lval, &neg,
2323 proc_wspace_sep,
2324 sizeof(proc_wspace_sep), NULL);
2325 if (err || neg) {
2326 err = -EINVAL;
2327 goto out_free;
2328 }
2329
2330 if (conv(&lval, tbl_data, 1, data)) {
2331 err = -EINVAL;
2332 goto out_free;
2333 }
2334
2335 if (!err && left)
2336 left -= proc_skip_spaces(&p);
2337
2338out_free:
2339 kfree(kbuf);
2340 if (err)
2341 return -EINVAL;
2342
2343 return 0;
2344
2345 /* This is in keeping with old __do_proc_dointvec() */
2346bail_early:
2347 *ppos += *lenp;
2348 return err;
2349}
2350
2351static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2352 size_t *lenp, loff_t *ppos,
2353 int (*conv)(unsigned long *lvalp,
2354 unsigned int *valp,
2355 int write, void *data),
2356 void *data)
2357{
2358 unsigned long lval;
2359 int err = 0;
2360 size_t left;
2361
2362 left = *lenp;
2363
2364 if (conv(&lval, tbl_data, 0, data)) {
2365 err = -EINVAL;
2366 goto out;
2367 }
2368
2369 err = proc_put_long(&buffer, &left, lval, false);
2370 if (err || !left)
2371 goto out;
2372
2373 err = proc_put_char(&buffer, &left, '\n');
2374
2375out:
2376 *lenp -= left;
2377 *ppos += *lenp;
2378
2379 return err;
2380}
2381
2382static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2383 int write, void __user *buffer,
2384 size_t *lenp, loff_t *ppos,
2385 int (*conv)(unsigned long *lvalp,
2386 unsigned int *valp,
2387 int write, void *data),
2388 void *data)
2389{
2390 unsigned int *i, vleft;
2391
2392 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2393 *lenp = 0;
2394 return 0;
2395 }
2396
2397 i = (unsigned int *) tbl_data;
2398 vleft = table->maxlen / sizeof(*i);
2399
2400 /*
2401 * Arrays are not supported, keep this simple. *Do not* add
2402 * support for them.
2403 */
2404 if (vleft != 1) {
2405 *lenp = 0;
2406 return -EINVAL;
2407 }
2408
2409 if (!conv)
2410 conv = do_proc_douintvec_conv;
2411
2412 if (write)
2413 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2414 conv, data);
2415 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2416}
2417
2418static int do_proc_douintvec(struct ctl_table *table, int write,
2419 void __user *buffer, size_t *lenp, loff_t *ppos,
2420 int (*conv)(unsigned long *lvalp,
2421 unsigned int *valp,
2422 int write, void *data),
2423 void *data)
2424{
2425 return __do_proc_douintvec(table->data, table, write,
2426 buffer, lenp, ppos, conv, data);
2427}
2428
2429/**
2430 * proc_dointvec - read a vector of integers
2431 * @table: the sysctl table
2432 * @write: %TRUE if this is a write to the sysctl file
2433 * @buffer: the user buffer
2434 * @lenp: the size of the user buffer
2435 * @ppos: file position
2436 *
2437 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2438 * values from/to the user buffer, treated as an ASCII string.
2439 *
2440 * Returns 0 on success.
2441 */
2442int proc_dointvec(struct ctl_table *table, int write,
2443 void __user *buffer, size_t *lenp, loff_t *ppos)
2444{
2445 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2446}
2447
2448/**
2449 * proc_douintvec - read a vector of unsigned integers
2450 * @table: the sysctl table
2451 * @write: %TRUE if this is a write to the sysctl file
2452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: file position
2455 *
2456 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2457 * values from/to the user buffer, treated as an ASCII string.
2458 *
2459 * Returns 0 on success.
2460 */
2461int proc_douintvec(struct ctl_table *table, int write,
2462 void __user *buffer, size_t *lenp, loff_t *ppos)
2463{
2464 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2465 do_proc_douintvec_conv, NULL);
2466}
2467
2468/*
2469 * Taint values can only be increased
2470 * This means we can safely use a temporary.
2471 */
2472static int proc_taint(struct ctl_table *table, int write,
2473 void __user *buffer, size_t *lenp, loff_t *ppos)
2474{
2475 struct ctl_table t;
2476 unsigned long tmptaint = get_taint();
2477 int err;
2478
2479 if (write && !capable(CAP_SYS_ADMIN))
2480 return -EPERM;
2481
2482 t = *table;
2483 t.data = &tmptaint;
2484 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2485 if (err < 0)
2486 return err;
2487
2488 if (write) {
2489 /*
2490 * Poor man's atomic or. Not worth adding a primitive
2491 * to everyone's atomic.h for this
2492 */
2493 int i;
2494 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2495 if ((tmptaint >> i) & 1)
2496 add_taint(i, LOCKDEP_STILL_OK);
2497 }
2498 }
2499
2500 return err;
2501}
2502
2503#ifdef CONFIG_PRINTK
2504static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2505 void __user *buffer, size_t *lenp, loff_t *ppos)
2506{
2507 if (write && !capable(CAP_SYS_ADMIN))
2508 return -EPERM;
2509
2510 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2511}
2512#endif
2513
2514/**
2515 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2516 * @min: pointer to minimum allowable value
2517 * @max: pointer to maximum allowable value
2518 *
2519 * The do_proc_dointvec_minmax_conv_param structure provides the
2520 * minimum and maximum values for doing range checking for those sysctl
2521 * parameters that use the proc_dointvec_minmax() handler.
2522 */
2523struct do_proc_dointvec_minmax_conv_param {
2524 int *min;
2525 int *max;
2526};
2527
2528static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2529 int *valp,
2530 int write, void *data)
2531{
2532 struct do_proc_dointvec_minmax_conv_param *param = data;
2533 if (write) {
2534 int val = *negp ? -*lvalp : *lvalp;
2535 if ((param->min && *param->min > val) ||
2536 (param->max && *param->max < val))
2537 return -EINVAL;
2538 *valp = val;
2539 } else {
2540 int val = *valp;
2541 if (val < 0) {
2542 *negp = true;
2543 *lvalp = -(unsigned long)val;
2544 } else {
2545 *negp = false;
2546 *lvalp = (unsigned long)val;
2547 }
2548 }
2549 return 0;
2550}
2551
2552/**
2553 * proc_dointvec_minmax - read a vector of integers with min/max values
2554 * @table: the sysctl table
2555 * @write: %TRUE if this is a write to the sysctl file
2556 * @buffer: the user buffer
2557 * @lenp: the size of the user buffer
2558 * @ppos: file position
2559 *
2560 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2561 * values from/to the user buffer, treated as an ASCII string.
2562 *
2563 * This routine will ensure the values are within the range specified by
2564 * table->extra1 (min) and table->extra2 (max).
2565 *
2566 * Returns 0 on success or -EINVAL on write when the range check fails.
2567 */
2568int proc_dointvec_minmax(struct ctl_table *table, int write,
2569 void __user *buffer, size_t *lenp, loff_t *ppos)
2570{
2571 struct do_proc_dointvec_minmax_conv_param param = {
2572 .min = (int *) table->extra1,
2573 .max = (int *) table->extra2,
2574 };
2575 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2576 do_proc_dointvec_minmax_conv, ¶m);
2577}
2578
2579/**
2580 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2581 * @min: pointer to minimum allowable value
2582 * @max: pointer to maximum allowable value
2583 *
2584 * The do_proc_douintvec_minmax_conv_param structure provides the
2585 * minimum and maximum values for doing range checking for those sysctl
2586 * parameters that use the proc_douintvec_minmax() handler.
2587 */
2588struct do_proc_douintvec_minmax_conv_param {
2589 unsigned int *min;
2590 unsigned int *max;
2591};
2592
2593static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2594 unsigned int *valp,
2595 int write, void *data)
2596{
2597 struct do_proc_douintvec_minmax_conv_param *param = data;
2598
2599 if (write) {
2600 unsigned int val = *lvalp;
2601
2602 if (*lvalp > UINT_MAX)
2603 return -EINVAL;
2604
2605 if ((param->min && *param->min > val) ||
2606 (param->max && *param->max < val))
2607 return -ERANGE;
2608
2609 *valp = val;
2610 } else {
2611 unsigned int val = *valp;
2612 *lvalp = (unsigned long) val;
2613 }
2614
2615 return 0;
2616}
2617
2618/**
2619 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2620 * @table: the sysctl table
2621 * @write: %TRUE if this is a write to the sysctl file
2622 * @buffer: the user buffer
2623 * @lenp: the size of the user buffer
2624 * @ppos: file position
2625 *
2626 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2627 * values from/to the user buffer, treated as an ASCII string. Negative
2628 * strings are not allowed.
2629 *
2630 * This routine will ensure the values are within the range specified by
2631 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2632 * check for UINT_MAX to avoid having to support wrap around uses from
2633 * userspace.
2634 *
2635 * Returns 0 on success or -ERANGE on write when the range check fails.
2636 */
2637int proc_douintvec_minmax(struct ctl_table *table, int write,
2638 void __user *buffer, size_t *lenp, loff_t *ppos)
2639{
2640 struct do_proc_douintvec_minmax_conv_param param = {
2641 .min = (unsigned int *) table->extra1,
2642 .max = (unsigned int *) table->extra2,
2643 };
2644 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2645 do_proc_douintvec_minmax_conv, ¶m);
2646}
2647
2648static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2649 unsigned int *valp,
2650 int write, void *data)
2651{
2652 if (write) {
2653 unsigned int val;
2654
2655 val = round_pipe_size(*lvalp);
2656 if (val == 0)
2657 return -EINVAL;
2658
2659 *valp = val;
2660 } else {
2661 unsigned int val = *valp;
2662 *lvalp = (unsigned long) val;
2663 }
2664
2665 return 0;
2666}
2667
2668static int proc_dopipe_max_size(struct ctl_table *table, int write,
2669 void __user *buffer, size_t *lenp, loff_t *ppos)
2670{
2671 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2672 do_proc_dopipe_max_size_conv, NULL);
2673}
2674
2675static void validate_coredump_safety(void)
2676{
2677#ifdef CONFIG_COREDUMP
2678 if (suid_dumpable == SUID_DUMP_ROOT &&
2679 core_pattern[0] != '/' && core_pattern[0] != '|') {
2680 printk(KERN_WARNING
2681"Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2682"Pipe handler or fully qualified core dump path required.\n"
2683"Set kernel.core_pattern before fs.suid_dumpable.\n"
2684 );
2685 }
2686#endif
2687}
2688
2689static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2690 void __user *buffer, size_t *lenp, loff_t *ppos)
2691{
2692 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2693 if (!error)
2694 validate_coredump_safety();
2695 return error;
2696}
2697
2698#ifdef CONFIG_COREDUMP
2699static int proc_dostring_coredump(struct ctl_table *table, int write,
2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701{
2702 int error = proc_dostring(table, write, buffer, lenp, ppos);
2703 if (!error)
2704 validate_coredump_safety();
2705 return error;
2706}
2707#endif
2708
2709static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2710 void __user *buffer,
2711 size_t *lenp, loff_t *ppos,
2712 unsigned long convmul,
2713 unsigned long convdiv)
2714{
2715 unsigned long *i, *min, *max;
2716 int vleft, first = 1, err = 0;
2717 size_t left;
2718 char *kbuf = NULL, *p;
2719
2720 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2721 *lenp = 0;
2722 return 0;
2723 }
2724
2725 i = (unsigned long *) data;
2726 min = (unsigned long *) table->extra1;
2727 max = (unsigned long *) table->extra2;
2728 vleft = table->maxlen / sizeof(unsigned long);
2729 left = *lenp;
2730
2731 if (write) {
2732 if (proc_first_pos_non_zero_ignore(ppos, table))
2733 goto out;
2734
2735 if (left > PAGE_SIZE - 1)
2736 left = PAGE_SIZE - 1;
2737 p = kbuf = memdup_user_nul(buffer, left);
2738 if (IS_ERR(kbuf))
2739 return PTR_ERR(kbuf);
2740 }
2741
2742 for (; left && vleft--; i++, first = 0) {
2743 unsigned long val;
2744
2745 if (write) {
2746 bool neg;
2747
2748 left -= proc_skip_spaces(&p);
2749
2750 err = proc_get_long(&p, &left, &val, &neg,
2751 proc_wspace_sep,
2752 sizeof(proc_wspace_sep), NULL);
2753 if (err)
2754 break;
2755 if (neg)
2756 continue;
2757 val = convmul * val / convdiv;
2758 if ((min && val < *min) || (max && val > *max))
2759 continue;
2760 *i = val;
2761 } else {
2762 val = convdiv * (*i) / convmul;
2763 if (!first) {
2764 err = proc_put_char(&buffer, &left, '\t');
2765 if (err)
2766 break;
2767 }
2768 err = proc_put_long(&buffer, &left, val, false);
2769 if (err)
2770 break;
2771 }
2772 }
2773
2774 if (!write && !first && left && !err)
2775 err = proc_put_char(&buffer, &left, '\n');
2776 if (write && !err)
2777 left -= proc_skip_spaces(&p);
2778 if (write) {
2779 kfree(kbuf);
2780 if (first)
2781 return err ? : -EINVAL;
2782 }
2783 *lenp -= left;
2784out:
2785 *ppos += *lenp;
2786 return err;
2787}
2788
2789static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2790 void __user *buffer,
2791 size_t *lenp, loff_t *ppos,
2792 unsigned long convmul,
2793 unsigned long convdiv)
2794{
2795 return __do_proc_doulongvec_minmax(table->data, table, write,
2796 buffer, lenp, ppos, convmul, convdiv);
2797}
2798
2799/**
2800 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2801 * @table: the sysctl table
2802 * @write: %TRUE if this is a write to the sysctl file
2803 * @buffer: the user buffer
2804 * @lenp: the size of the user buffer
2805 * @ppos: file position
2806 *
2807 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2808 * values from/to the user buffer, treated as an ASCII string.
2809 *
2810 * This routine will ensure the values are within the range specified by
2811 * table->extra1 (min) and table->extra2 (max).
2812 *
2813 * Returns 0 on success.
2814 */
2815int proc_doulongvec_minmax(struct ctl_table *table, int write,
2816 void __user *buffer, size_t *lenp, loff_t *ppos)
2817{
2818 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2819}
2820
2821/**
2822 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2823 * @table: the sysctl table
2824 * @write: %TRUE if this is a write to the sysctl file
2825 * @buffer: the user buffer
2826 * @lenp: the size of the user buffer
2827 * @ppos: file position
2828 *
2829 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2830 * values from/to the user buffer, treated as an ASCII string. The values
2831 * are treated as milliseconds, and converted to jiffies when they are stored.
2832 *
2833 * This routine will ensure the values are within the range specified by
2834 * table->extra1 (min) and table->extra2 (max).
2835 *
2836 * Returns 0 on success.
2837 */
2838int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2839 void __user *buffer,
2840 size_t *lenp, loff_t *ppos)
2841{
2842 return do_proc_doulongvec_minmax(table, write, buffer,
2843 lenp, ppos, HZ, 1000l);
2844}
2845
2846
2847static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2848 int *valp,
2849 int write, void *data)
2850{
2851 if (write) {
2852 if (*lvalp > INT_MAX / HZ)
2853 return 1;
2854 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2855 } else {
2856 int val = *valp;
2857 unsigned long lval;
2858 if (val < 0) {
2859 *negp = true;
2860 lval = -(unsigned long)val;
2861 } else {
2862 *negp = false;
2863 lval = (unsigned long)val;
2864 }
2865 *lvalp = lval / HZ;
2866 }
2867 return 0;
2868}
2869
2870static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2871 int *valp,
2872 int write, void *data)
2873{
2874 if (write) {
2875 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2876 return 1;
2877 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2878 } else {
2879 int val = *valp;
2880 unsigned long lval;
2881 if (val < 0) {
2882 *negp = true;
2883 lval = -(unsigned long)val;
2884 } else {
2885 *negp = false;
2886 lval = (unsigned long)val;
2887 }
2888 *lvalp = jiffies_to_clock_t(lval);
2889 }
2890 return 0;
2891}
2892
2893static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2894 int *valp,
2895 int write, void *data)
2896{
2897 if (write) {
2898 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2899
2900 if (jif > INT_MAX)
2901 return 1;
2902 *valp = (int)jif;
2903 } else {
2904 int val = *valp;
2905 unsigned long lval;
2906 if (val < 0) {
2907 *negp = true;
2908 lval = -(unsigned long)val;
2909 } else {
2910 *negp = false;
2911 lval = (unsigned long)val;
2912 }
2913 *lvalp = jiffies_to_msecs(lval);
2914 }
2915 return 0;
2916}
2917
2918/**
2919 * proc_dointvec_jiffies - read a vector of integers as seconds
2920 * @table: the sysctl table
2921 * @write: %TRUE if this is a write to the sysctl file
2922 * @buffer: the user buffer
2923 * @lenp: the size of the user buffer
2924 * @ppos: file position
2925 *
2926 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2927 * values from/to the user buffer, treated as an ASCII string.
2928 * The values read are assumed to be in seconds, and are converted into
2929 * jiffies.
2930 *
2931 * Returns 0 on success.
2932 */
2933int proc_dointvec_jiffies(struct ctl_table *table, int write,
2934 void __user *buffer, size_t *lenp, loff_t *ppos)
2935{
2936 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2937 do_proc_dointvec_jiffies_conv,NULL);
2938}
2939
2940/**
2941 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2942 * @table: the sysctl table
2943 * @write: %TRUE if this is a write to the sysctl file
2944 * @buffer: the user buffer
2945 * @lenp: the size of the user buffer
2946 * @ppos: pointer to the file position
2947 *
2948 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2949 * values from/to the user buffer, treated as an ASCII string.
2950 * The values read are assumed to be in 1/USER_HZ seconds, and
2951 * are converted into jiffies.
2952 *
2953 * Returns 0 on success.
2954 */
2955int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2956 void __user *buffer, size_t *lenp, loff_t *ppos)
2957{
2958 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2959 do_proc_dointvec_userhz_jiffies_conv,NULL);
2960}
2961
2962/**
2963 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2964 * @table: the sysctl table
2965 * @write: %TRUE if this is a write to the sysctl file
2966 * @buffer: the user buffer
2967 * @lenp: the size of the user buffer
2968 * @ppos: file position
2969 * @ppos: the current position in the file
2970 *
2971 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2972 * values from/to the user buffer, treated as an ASCII string.
2973 * The values read are assumed to be in 1/1000 seconds, and
2974 * are converted into jiffies.
2975 *
2976 * Returns 0 on success.
2977 */
2978int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2979 void __user *buffer, size_t *lenp, loff_t *ppos)
2980{
2981 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2982 do_proc_dointvec_ms_jiffies_conv, NULL);
2983}
2984
2985static int proc_do_cad_pid(struct ctl_table *table, int write,
2986 void __user *buffer, size_t *lenp, loff_t *ppos)
2987{
2988 struct pid *new_pid;
2989 pid_t tmp;
2990 int r;
2991
2992 tmp = pid_vnr(cad_pid);
2993
2994 r = __do_proc_dointvec(&tmp, table, write, buffer,
2995 lenp, ppos, NULL, NULL);
2996 if (r || !write)
2997 return r;
2998
2999 new_pid = find_get_pid(tmp);
3000 if (!new_pid)
3001 return -ESRCH;
3002
3003 put_pid(xchg(&cad_pid, new_pid));
3004 return 0;
3005}
3006
3007/**
3008 * proc_do_large_bitmap - read/write from/to a large bitmap
3009 * @table: the sysctl table
3010 * @write: %TRUE if this is a write to the sysctl file
3011 * @buffer: the user buffer
3012 * @lenp: the size of the user buffer
3013 * @ppos: file position
3014 *
3015 * The bitmap is stored at table->data and the bitmap length (in bits)
3016 * in table->maxlen.
3017 *
3018 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3019 * large bitmaps may be represented in a compact manner. Writing into
3020 * the file will clear the bitmap then update it with the given input.
3021 *
3022 * Returns 0 on success.
3023 */
3024int proc_do_large_bitmap(struct ctl_table *table, int write,
3025 void __user *buffer, size_t *lenp, loff_t *ppos)
3026{
3027 int err = 0;
3028 bool first = 1;
3029 size_t left = *lenp;
3030 unsigned long bitmap_len = table->maxlen;
3031 unsigned long *bitmap = *(unsigned long **) table->data;
3032 unsigned long *tmp_bitmap = NULL;
3033 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3034
3035 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3036 *lenp = 0;
3037 return 0;
3038 }
3039
3040 if (write) {
3041 char *kbuf, *p;
3042
3043 if (left > PAGE_SIZE - 1)
3044 left = PAGE_SIZE - 1;
3045
3046 p = kbuf = memdup_user_nul(buffer, left);
3047 if (IS_ERR(kbuf))
3048 return PTR_ERR(kbuf);
3049
3050 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3051 GFP_KERNEL);
3052 if (!tmp_bitmap) {
3053 kfree(kbuf);
3054 return -ENOMEM;
3055 }
3056 proc_skip_char(&p, &left, '\n');
3057 while (!err && left) {
3058 unsigned long val_a, val_b;
3059 bool neg;
3060
3061 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3062 sizeof(tr_a), &c);
3063 if (err)
3064 break;
3065 if (val_a >= bitmap_len || neg) {
3066 err = -EINVAL;
3067 break;
3068 }
3069
3070 val_b = val_a;
3071 if (left) {
3072 p++;
3073 left--;
3074 }
3075
3076 if (c == '-') {
3077 err = proc_get_long(&p, &left, &val_b,
3078 &neg, tr_b, sizeof(tr_b),
3079 &c);
3080 if (err)
3081 break;
3082 if (val_b >= bitmap_len || neg ||
3083 val_a > val_b) {
3084 err = -EINVAL;
3085 break;
3086 }
3087 if (left) {
3088 p++;
3089 left--;
3090 }
3091 }
3092
3093 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3094 first = 0;
3095 proc_skip_char(&p, &left, '\n');
3096 }
3097 kfree(kbuf);
3098 } else {
3099 unsigned long bit_a, bit_b = 0;
3100
3101 while (left) {
3102 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3103 if (bit_a >= bitmap_len)
3104 break;
3105 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3106 bit_a + 1) - 1;
3107
3108 if (!first) {
3109 err = proc_put_char(&buffer, &left, ',');
3110 if (err)
3111 break;
3112 }
3113 err = proc_put_long(&buffer, &left, bit_a, false);
3114 if (err)
3115 break;
3116 if (bit_a != bit_b) {
3117 err = proc_put_char(&buffer, &left, '-');
3118 if (err)
3119 break;
3120 err = proc_put_long(&buffer, &left, bit_b, false);
3121 if (err)
3122 break;
3123 }
3124
3125 first = 0; bit_b++;
3126 }
3127 if (!err)
3128 err = proc_put_char(&buffer, &left, '\n');
3129 }
3130
3131 if (!err) {
3132 if (write) {
3133 if (*ppos)
3134 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3135 else
3136 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3137 }
3138 *lenp -= left;
3139 *ppos += *lenp;
3140 }
3141
3142 kfree(tmp_bitmap);
3143 return err;
3144}
3145
3146#else /* CONFIG_PROC_SYSCTL */
3147
3148int proc_dostring(struct ctl_table *table, int write,
3149 void __user *buffer, size_t *lenp, loff_t *ppos)
3150{
3151 return -ENOSYS;
3152}
3153
3154int proc_dointvec(struct ctl_table *table, int write,
3155 void __user *buffer, size_t *lenp, loff_t *ppos)
3156{
3157 return -ENOSYS;
3158}
3159
3160int proc_douintvec(struct ctl_table *table, int write,
3161 void __user *buffer, size_t *lenp, loff_t *ppos)
3162{
3163 return -ENOSYS;
3164}
3165
3166int proc_dointvec_minmax(struct ctl_table *table, int write,
3167 void __user *buffer, size_t *lenp, loff_t *ppos)
3168{
3169 return -ENOSYS;
3170}
3171
3172int proc_douintvec_minmax(struct ctl_table *table, int write,
3173 void __user *buffer, size_t *lenp, loff_t *ppos)
3174{
3175 return -ENOSYS;
3176}
3177
3178int proc_dointvec_jiffies(struct ctl_table *table, int write,
3179 void __user *buffer, size_t *lenp, loff_t *ppos)
3180{
3181 return -ENOSYS;
3182}
3183
3184int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3185 void __user *buffer, size_t *lenp, loff_t *ppos)
3186{
3187 return -ENOSYS;
3188}
3189
3190int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3191 void __user *buffer, size_t *lenp, loff_t *ppos)
3192{
3193 return -ENOSYS;
3194}
3195
3196int proc_doulongvec_minmax(struct ctl_table *table, int write,
3197 void __user *buffer, size_t *lenp, loff_t *ppos)
3198{
3199 return -ENOSYS;
3200}
3201
3202int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3203 void __user *buffer,
3204 size_t *lenp, loff_t *ppos)
3205{
3206 return -ENOSYS;
3207}
3208
3209
3210#endif /* CONFIG_PROC_SYSCTL */
3211
3212/*
3213 * No sense putting this after each symbol definition, twice,
3214 * exception granted :-)
3215 */
3216EXPORT_SYMBOL(proc_dointvec);
3217EXPORT_SYMBOL(proc_douintvec);
3218EXPORT_SYMBOL(proc_dointvec_jiffies);
3219EXPORT_SYMBOL(proc_dointvec_minmax);
3220EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3221EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3222EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3223EXPORT_SYMBOL(proc_dostring);
3224EXPORT_SYMBOL(proc_doulongvec_minmax);
3225EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
26#include <linux/bitmap.h>
27#include <linux/signal.h>
28#include <linux/printk.h>
29#include <linux/proc_fs.h>
30#include <linux/security.h>
31#include <linux/ctype.h>
32#include <linux/kmemcheck.h>
33#include <linux/fs.h>
34#include <linux/init.h>
35#include <linux/kernel.h>
36#include <linux/kobject.h>
37#include <linux/net.h>
38#include <linux/sysrq.h>
39#include <linux/highuid.h>
40#include <linux/writeback.h>
41#include <linux/ratelimit.h>
42#include <linux/compaction.h>
43#include <linux/hugetlb.h>
44#include <linux/initrd.h>
45#include <linux/key.h>
46#include <linux/times.h>
47#include <linux/limits.h>
48#include <linux/dcache.h>
49#include <linux/dnotify.h>
50#include <linux/syscalls.h>
51#include <linux/vmstat.h>
52#include <linux/nfs_fs.h>
53#include <linux/acpi.h>
54#include <linux/reboot.h>
55#include <linux/ftrace.h>
56#include <linux/perf_event.h>
57#include <linux/kprobes.h>
58#include <linux/pipe_fs_i.h>
59#include <linux/oom.h>
60#include <linux/kmod.h>
61#include <linux/capability.h>
62#include <linux/binfmts.h>
63
64#include <asm/uaccess.h>
65#include <asm/processor.h>
66
67#ifdef CONFIG_X86
68#include <asm/nmi.h>
69#include <asm/stacktrace.h>
70#include <asm/io.h>
71#endif
72#ifdef CONFIG_SPARC
73#include <asm/setup.h>
74#endif
75#ifdef CONFIG_BSD_PROCESS_ACCT
76#include <linux/acct.h>
77#endif
78#ifdef CONFIG_RT_MUTEXES
79#include <linux/rtmutex.h>
80#endif
81#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
82#include <linux/lockdep.h>
83#endif
84#ifdef CONFIG_CHR_DEV_SG
85#include <scsi/sg.h>
86#endif
87
88#ifdef CONFIG_LOCKUP_DETECTOR
89#include <linux/nmi.h>
90#endif
91
92
93#if defined(CONFIG_SYSCTL)
94
95/* External variables not in a header file. */
96extern int sysctl_overcommit_memory;
97extern int sysctl_overcommit_ratio;
98extern int max_threads;
99extern int core_uses_pid;
100extern int suid_dumpable;
101extern char core_pattern[];
102extern unsigned int core_pipe_limit;
103extern int pid_max;
104extern int min_free_kbytes;
105extern int pid_max_min, pid_max_max;
106extern int sysctl_drop_caches;
107extern int percpu_pagelist_fraction;
108extern int compat_log;
109extern int latencytop_enabled;
110extern int sysctl_nr_open_min, sysctl_nr_open_max;
111#ifndef CONFIG_MMU
112extern int sysctl_nr_trim_pages;
113#endif
114#ifdef CONFIG_BLOCK
115extern int blk_iopoll_enabled;
116#endif
117
118/* Constants used for minimum and maximum */
119#ifdef CONFIG_LOCKUP_DETECTOR
120static int sixty = 60;
121static int neg_one = -1;
122#endif
123
124static int zero;
125static int __maybe_unused one = 1;
126static int __maybe_unused two = 2;
127static int __maybe_unused three = 3;
128static unsigned long one_ul = 1;
129static int one_hundred = 100;
130#ifdef CONFIG_PRINTK
131static int ten_thousand = 10000;
132#endif
133
134/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136
137/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138static int maxolduid = 65535;
139static int minolduid;
140static int min_percpu_pagelist_fract = 8;
141
142static int ngroups_max = NGROUPS_MAX;
143static const int cap_last_cap = CAP_LAST_CAP;
144
145#ifdef CONFIG_INOTIFY_USER
146#include <linux/inotify.h>
147#endif
148#ifdef CONFIG_SPARC
149#endif
150
151#ifdef CONFIG_SPARC64
152extern int sysctl_tsb_ratio;
153#endif
154
155#ifdef __hppa__
156extern int pwrsw_enabled;
157extern int unaligned_enabled;
158#endif
159
160#ifdef CONFIG_IA64
161extern int no_unaligned_warning;
162extern int unaligned_dump_stack;
163#endif
164
165#ifdef CONFIG_PROC_SYSCTL
166static int proc_do_cad_pid(struct ctl_table *table, int write,
167 void __user *buffer, size_t *lenp, loff_t *ppos);
168static int proc_taint(struct ctl_table *table, int write,
169 void __user *buffer, size_t *lenp, loff_t *ppos);
170#endif
171
172#ifdef CONFIG_PRINTK
173static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175#endif
176
177#ifdef CONFIG_MAGIC_SYSRQ
178/* Note: sysrq code uses it's own private copy */
179static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
180
181static int sysrq_sysctl_handler(ctl_table *table, int write,
182 void __user *buffer, size_t *lenp,
183 loff_t *ppos)
184{
185 int error;
186
187 error = proc_dointvec(table, write, buffer, lenp, ppos);
188 if (error)
189 return error;
190
191 if (write)
192 sysrq_toggle_support(__sysrq_enabled);
193
194 return 0;
195}
196
197#endif
198
199static struct ctl_table kern_table[];
200static struct ctl_table vm_table[];
201static struct ctl_table fs_table[];
202static struct ctl_table debug_table[];
203static struct ctl_table dev_table[];
204extern struct ctl_table random_table[];
205#ifdef CONFIG_EPOLL
206extern struct ctl_table epoll_table[];
207#endif
208
209#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
210int sysctl_legacy_va_layout;
211#endif
212
213/* The default sysctl tables: */
214
215static struct ctl_table sysctl_base_table[] = {
216 {
217 .procname = "kernel",
218 .mode = 0555,
219 .child = kern_table,
220 },
221 {
222 .procname = "vm",
223 .mode = 0555,
224 .child = vm_table,
225 },
226 {
227 .procname = "fs",
228 .mode = 0555,
229 .child = fs_table,
230 },
231 {
232 .procname = "debug",
233 .mode = 0555,
234 .child = debug_table,
235 },
236 {
237 .procname = "dev",
238 .mode = 0555,
239 .child = dev_table,
240 },
241 { }
242};
243
244#ifdef CONFIG_SCHED_DEBUG
245static int min_sched_granularity_ns = 100000; /* 100 usecs */
246static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
247static int min_wakeup_granularity_ns; /* 0 usecs */
248static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
249static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
250static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
251#endif
252
253#ifdef CONFIG_COMPACTION
254static int min_extfrag_threshold;
255static int max_extfrag_threshold = 1000;
256#endif
257
258static struct ctl_table kern_table[] = {
259 {
260 .procname = "sched_child_runs_first",
261 .data = &sysctl_sched_child_runs_first,
262 .maxlen = sizeof(unsigned int),
263 .mode = 0644,
264 .proc_handler = proc_dointvec,
265 },
266#ifdef CONFIG_SCHED_DEBUG
267 {
268 .procname = "sched_min_granularity_ns",
269 .data = &sysctl_sched_min_granularity,
270 .maxlen = sizeof(unsigned int),
271 .mode = 0644,
272 .proc_handler = sched_proc_update_handler,
273 .extra1 = &min_sched_granularity_ns,
274 .extra2 = &max_sched_granularity_ns,
275 },
276 {
277 .procname = "sched_latency_ns",
278 .data = &sysctl_sched_latency,
279 .maxlen = sizeof(unsigned int),
280 .mode = 0644,
281 .proc_handler = sched_proc_update_handler,
282 .extra1 = &min_sched_granularity_ns,
283 .extra2 = &max_sched_granularity_ns,
284 },
285 {
286 .procname = "sched_wakeup_granularity_ns",
287 .data = &sysctl_sched_wakeup_granularity,
288 .maxlen = sizeof(unsigned int),
289 .mode = 0644,
290 .proc_handler = sched_proc_update_handler,
291 .extra1 = &min_wakeup_granularity_ns,
292 .extra2 = &max_wakeup_granularity_ns,
293 },
294 {
295 .procname = "sched_tunable_scaling",
296 .data = &sysctl_sched_tunable_scaling,
297 .maxlen = sizeof(enum sched_tunable_scaling),
298 .mode = 0644,
299 .proc_handler = sched_proc_update_handler,
300 .extra1 = &min_sched_tunable_scaling,
301 .extra2 = &max_sched_tunable_scaling,
302 },
303 {
304 .procname = "sched_migration_cost",
305 .data = &sysctl_sched_migration_cost,
306 .maxlen = sizeof(unsigned int),
307 .mode = 0644,
308 .proc_handler = proc_dointvec,
309 },
310 {
311 .procname = "sched_nr_migrate",
312 .data = &sysctl_sched_nr_migrate,
313 .maxlen = sizeof(unsigned int),
314 .mode = 0644,
315 .proc_handler = proc_dointvec,
316 },
317 {
318 .procname = "sched_time_avg",
319 .data = &sysctl_sched_time_avg,
320 .maxlen = sizeof(unsigned int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec,
323 },
324 {
325 .procname = "sched_shares_window",
326 .data = &sysctl_sched_shares_window,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec,
330 },
331 {
332 .procname = "timer_migration",
333 .data = &sysctl_timer_migration,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec_minmax,
337 .extra1 = &zero,
338 .extra2 = &one,
339 },
340#endif
341 {
342 .procname = "sched_rt_period_us",
343 .data = &sysctl_sched_rt_period,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = sched_rt_handler,
347 },
348 {
349 .procname = "sched_rt_runtime_us",
350 .data = &sysctl_sched_rt_runtime,
351 .maxlen = sizeof(int),
352 .mode = 0644,
353 .proc_handler = sched_rt_handler,
354 },
355#ifdef CONFIG_SCHED_AUTOGROUP
356 {
357 .procname = "sched_autogroup_enabled",
358 .data = &sysctl_sched_autogroup_enabled,
359 .maxlen = sizeof(unsigned int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec_minmax,
362 .extra1 = &zero,
363 .extra2 = &one,
364 },
365#endif
366#ifdef CONFIG_CFS_BANDWIDTH
367 {
368 .procname = "sched_cfs_bandwidth_slice_us",
369 .data = &sysctl_sched_cfs_bandwidth_slice,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec_minmax,
373 .extra1 = &one,
374 },
375#endif
376#ifdef CONFIG_PROVE_LOCKING
377 {
378 .procname = "prove_locking",
379 .data = &prove_locking,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384#endif
385#ifdef CONFIG_LOCK_STAT
386 {
387 .procname = "lock_stat",
388 .data = &lock_stat,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393#endif
394 {
395 .procname = "panic",
396 .data = &panic_timeout,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec,
400 },
401 {
402 .procname = "core_uses_pid",
403 .data = &core_uses_pid,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec,
407 },
408 {
409 .procname = "core_pattern",
410 .data = core_pattern,
411 .maxlen = CORENAME_MAX_SIZE,
412 .mode = 0644,
413 .proc_handler = proc_dostring,
414 },
415 {
416 .procname = "core_pipe_limit",
417 .data = &core_pipe_limit,
418 .maxlen = sizeof(unsigned int),
419 .mode = 0644,
420 .proc_handler = proc_dointvec,
421 },
422#ifdef CONFIG_PROC_SYSCTL
423 {
424 .procname = "tainted",
425 .maxlen = sizeof(long),
426 .mode = 0644,
427 .proc_handler = proc_taint,
428 },
429#endif
430#ifdef CONFIG_LATENCYTOP
431 {
432 .procname = "latencytop",
433 .data = &latencytop_enabled,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec,
437 },
438#endif
439#ifdef CONFIG_BLK_DEV_INITRD
440 {
441 .procname = "real-root-dev",
442 .data = &real_root_dev,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec,
446 },
447#endif
448 {
449 .procname = "print-fatal-signals",
450 .data = &print_fatal_signals,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec,
454 },
455#ifdef CONFIG_SPARC
456 {
457 .procname = "reboot-cmd",
458 .data = reboot_command,
459 .maxlen = 256,
460 .mode = 0644,
461 .proc_handler = proc_dostring,
462 },
463 {
464 .procname = "stop-a",
465 .data = &stop_a_enabled,
466 .maxlen = sizeof (int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec,
469 },
470 {
471 .procname = "scons-poweroff",
472 .data = &scons_pwroff,
473 .maxlen = sizeof (int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec,
476 },
477#endif
478#ifdef CONFIG_SPARC64
479 {
480 .procname = "tsb-ratio",
481 .data = &sysctl_tsb_ratio,
482 .maxlen = sizeof (int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486#endif
487#ifdef __hppa__
488 {
489 .procname = "soft-power",
490 .data = &pwrsw_enabled,
491 .maxlen = sizeof (int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec,
494 },
495 {
496 .procname = "unaligned-trap",
497 .data = &unaligned_enabled,
498 .maxlen = sizeof (int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec,
501 },
502#endif
503 {
504 .procname = "ctrl-alt-del",
505 .data = &C_A_D,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec,
509 },
510#ifdef CONFIG_FUNCTION_TRACER
511 {
512 .procname = "ftrace_enabled",
513 .data = &ftrace_enabled,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = ftrace_enable_sysctl,
517 },
518#endif
519#ifdef CONFIG_STACK_TRACER
520 {
521 .procname = "stack_tracer_enabled",
522 .data = &stack_tracer_enabled,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = stack_trace_sysctl,
526 },
527#endif
528#ifdef CONFIG_TRACING
529 {
530 .procname = "ftrace_dump_on_oops",
531 .data = &ftrace_dump_on_oops,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = proc_dointvec,
535 },
536#endif
537#ifdef CONFIG_MODULES
538 {
539 .procname = "modprobe",
540 .data = &modprobe_path,
541 .maxlen = KMOD_PATH_LEN,
542 .mode = 0644,
543 .proc_handler = proc_dostring,
544 },
545 {
546 .procname = "modules_disabled",
547 .data = &modules_disabled,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 /* only handle a transition from default "0" to "1" */
551 .proc_handler = proc_dointvec_minmax,
552 .extra1 = &one,
553 .extra2 = &one,
554 },
555#endif
556#ifdef CONFIG_HOTPLUG
557 {
558 .procname = "hotplug",
559 .data = &uevent_helper,
560 .maxlen = UEVENT_HELPER_PATH_LEN,
561 .mode = 0644,
562 .proc_handler = proc_dostring,
563 },
564#endif
565#ifdef CONFIG_CHR_DEV_SG
566 {
567 .procname = "sg-big-buff",
568 .data = &sg_big_buff,
569 .maxlen = sizeof (int),
570 .mode = 0444,
571 .proc_handler = proc_dointvec,
572 },
573#endif
574#ifdef CONFIG_BSD_PROCESS_ACCT
575 {
576 .procname = "acct",
577 .data = &acct_parm,
578 .maxlen = 3*sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582#endif
583#ifdef CONFIG_MAGIC_SYSRQ
584 {
585 .procname = "sysrq",
586 .data = &__sysrq_enabled,
587 .maxlen = sizeof (int),
588 .mode = 0644,
589 .proc_handler = sysrq_sysctl_handler,
590 },
591#endif
592#ifdef CONFIG_PROC_SYSCTL
593 {
594 .procname = "cad_pid",
595 .data = NULL,
596 .maxlen = sizeof (int),
597 .mode = 0600,
598 .proc_handler = proc_do_cad_pid,
599 },
600#endif
601 {
602 .procname = "threads-max",
603 .data = &max_threads,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec,
607 },
608 {
609 .procname = "random",
610 .mode = 0555,
611 .child = random_table,
612 },
613 {
614 .procname = "usermodehelper",
615 .mode = 0555,
616 .child = usermodehelper_table,
617 },
618 {
619 .procname = "overflowuid",
620 .data = &overflowuid,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 .proc_handler = proc_dointvec_minmax,
624 .extra1 = &minolduid,
625 .extra2 = &maxolduid,
626 },
627 {
628 .procname = "overflowgid",
629 .data = &overflowgid,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec_minmax,
633 .extra1 = &minolduid,
634 .extra2 = &maxolduid,
635 },
636#ifdef CONFIG_S390
637#ifdef CONFIG_MATHEMU
638 {
639 .procname = "ieee_emulation_warnings",
640 .data = &sysctl_ieee_emulation_warnings,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec,
644 },
645#endif
646 {
647 .procname = "userprocess_debug",
648 .data = &show_unhandled_signals,
649 .maxlen = sizeof(int),
650 .mode = 0644,
651 .proc_handler = proc_dointvec,
652 },
653#endif
654 {
655 .procname = "pid_max",
656 .data = &pid_max,
657 .maxlen = sizeof (int),
658 .mode = 0644,
659 .proc_handler = proc_dointvec_minmax,
660 .extra1 = &pid_max_min,
661 .extra2 = &pid_max_max,
662 },
663 {
664 .procname = "panic_on_oops",
665 .data = &panic_on_oops,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = proc_dointvec,
669 },
670#if defined CONFIG_PRINTK
671 {
672 .procname = "printk",
673 .data = &console_loglevel,
674 .maxlen = 4*sizeof(int),
675 .mode = 0644,
676 .proc_handler = proc_dointvec,
677 },
678 {
679 .procname = "printk_ratelimit",
680 .data = &printk_ratelimit_state.interval,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = proc_dointvec_jiffies,
684 },
685 {
686 .procname = "printk_ratelimit_burst",
687 .data = &printk_ratelimit_state.burst,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec,
691 },
692 {
693 .procname = "printk_delay",
694 .data = &printk_delay_msec,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = &zero,
699 .extra2 = &ten_thousand,
700 },
701 {
702 .procname = "dmesg_restrict",
703 .data = &dmesg_restrict,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 .proc_handler = proc_dointvec_minmax_sysadmin,
707 .extra1 = &zero,
708 .extra2 = &one,
709 },
710 {
711 .procname = "kptr_restrict",
712 .data = &kptr_restrict,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec_minmax_sysadmin,
716 .extra1 = &zero,
717 .extra2 = &two,
718 },
719#endif
720 {
721 .procname = "ngroups_max",
722 .data = &ngroups_max,
723 .maxlen = sizeof (int),
724 .mode = 0444,
725 .proc_handler = proc_dointvec,
726 },
727 {
728 .procname = "cap_last_cap",
729 .data = (void *)&cap_last_cap,
730 .maxlen = sizeof(int),
731 .mode = 0444,
732 .proc_handler = proc_dointvec,
733 },
734#if defined(CONFIG_LOCKUP_DETECTOR)
735 {
736 .procname = "watchdog",
737 .data = &watchdog_enabled,
738 .maxlen = sizeof (int),
739 .mode = 0644,
740 .proc_handler = proc_dowatchdog,
741 .extra1 = &zero,
742 .extra2 = &one,
743 },
744 {
745 .procname = "watchdog_thresh",
746 .data = &watchdog_thresh,
747 .maxlen = sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dowatchdog,
750 .extra1 = &neg_one,
751 .extra2 = &sixty,
752 },
753 {
754 .procname = "softlockup_panic",
755 .data = &softlockup_panic,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec_minmax,
759 .extra1 = &zero,
760 .extra2 = &one,
761 },
762 {
763 .procname = "nmi_watchdog",
764 .data = &watchdog_enabled,
765 .maxlen = sizeof (int),
766 .mode = 0644,
767 .proc_handler = proc_dowatchdog,
768 .extra1 = &zero,
769 .extra2 = &one,
770 },
771#endif
772#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
773 {
774 .procname = "unknown_nmi_panic",
775 .data = &unknown_nmi_panic,
776 .maxlen = sizeof (int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec,
779 },
780#endif
781#if defined(CONFIG_X86)
782 {
783 .procname = "panic_on_unrecovered_nmi",
784 .data = &panic_on_unrecovered_nmi,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec,
788 },
789 {
790 .procname = "panic_on_io_nmi",
791 .data = &panic_on_io_nmi,
792 .maxlen = sizeof(int),
793 .mode = 0644,
794 .proc_handler = proc_dointvec,
795 },
796#ifdef CONFIG_DEBUG_STACKOVERFLOW
797 {
798 .procname = "panic_on_stackoverflow",
799 .data = &sysctl_panic_on_stackoverflow,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec,
803 },
804#endif
805 {
806 .procname = "bootloader_type",
807 .data = &bootloader_type,
808 .maxlen = sizeof (int),
809 .mode = 0444,
810 .proc_handler = proc_dointvec,
811 },
812 {
813 .procname = "bootloader_version",
814 .data = &bootloader_version,
815 .maxlen = sizeof (int),
816 .mode = 0444,
817 .proc_handler = proc_dointvec,
818 },
819 {
820 .procname = "kstack_depth_to_print",
821 .data = &kstack_depth_to_print,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec,
825 },
826 {
827 .procname = "io_delay_type",
828 .data = &io_delay_type,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec,
832 },
833#endif
834#if defined(CONFIG_MMU)
835 {
836 .procname = "randomize_va_space",
837 .data = &randomize_va_space,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec,
841 },
842#endif
843#if defined(CONFIG_S390) && defined(CONFIG_SMP)
844 {
845 .procname = "spin_retry",
846 .data = &spin_retry,
847 .maxlen = sizeof (int),
848 .mode = 0644,
849 .proc_handler = proc_dointvec,
850 },
851#endif
852#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
853 {
854 .procname = "acpi_video_flags",
855 .data = &acpi_realmode_flags,
856 .maxlen = sizeof (unsigned long),
857 .mode = 0644,
858 .proc_handler = proc_doulongvec_minmax,
859 },
860#endif
861#ifdef CONFIG_IA64
862 {
863 .procname = "ignore-unaligned-usertrap",
864 .data = &no_unaligned_warning,
865 .maxlen = sizeof (int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec,
868 },
869 {
870 .procname = "unaligned-dump-stack",
871 .data = &unaligned_dump_stack,
872 .maxlen = sizeof (int),
873 .mode = 0644,
874 .proc_handler = proc_dointvec,
875 },
876#endif
877#ifdef CONFIG_DETECT_HUNG_TASK
878 {
879 .procname = "hung_task_panic",
880 .data = &sysctl_hung_task_panic,
881 .maxlen = sizeof(int),
882 .mode = 0644,
883 .proc_handler = proc_dointvec_minmax,
884 .extra1 = &zero,
885 .extra2 = &one,
886 },
887 {
888 .procname = "hung_task_check_count",
889 .data = &sysctl_hung_task_check_count,
890 .maxlen = sizeof(unsigned long),
891 .mode = 0644,
892 .proc_handler = proc_doulongvec_minmax,
893 },
894 {
895 .procname = "hung_task_timeout_secs",
896 .data = &sysctl_hung_task_timeout_secs,
897 .maxlen = sizeof(unsigned long),
898 .mode = 0644,
899 .proc_handler = proc_dohung_task_timeout_secs,
900 },
901 {
902 .procname = "hung_task_warnings",
903 .data = &sysctl_hung_task_warnings,
904 .maxlen = sizeof(unsigned long),
905 .mode = 0644,
906 .proc_handler = proc_doulongvec_minmax,
907 },
908#endif
909#ifdef CONFIG_COMPAT
910 {
911 .procname = "compat-log",
912 .data = &compat_log,
913 .maxlen = sizeof (int),
914 .mode = 0644,
915 .proc_handler = proc_dointvec,
916 },
917#endif
918#ifdef CONFIG_RT_MUTEXES
919 {
920 .procname = "max_lock_depth",
921 .data = &max_lock_depth,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec,
925 },
926#endif
927 {
928 .procname = "poweroff_cmd",
929 .data = &poweroff_cmd,
930 .maxlen = POWEROFF_CMD_PATH_LEN,
931 .mode = 0644,
932 .proc_handler = proc_dostring,
933 },
934#ifdef CONFIG_KEYS
935 {
936 .procname = "keys",
937 .mode = 0555,
938 .child = key_sysctls,
939 },
940#endif
941#ifdef CONFIG_RCU_TORTURE_TEST
942 {
943 .procname = "rcutorture_runnable",
944 .data = &rcutorture_runnable,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec,
948 },
949#endif
950#ifdef CONFIG_PERF_EVENTS
951 /*
952 * User-space scripts rely on the existence of this file
953 * as a feature check for perf_events being enabled.
954 *
955 * So it's an ABI, do not remove!
956 */
957 {
958 .procname = "perf_event_paranoid",
959 .data = &sysctl_perf_event_paranoid,
960 .maxlen = sizeof(sysctl_perf_event_paranoid),
961 .mode = 0644,
962 .proc_handler = proc_dointvec,
963 },
964 {
965 .procname = "perf_event_mlock_kb",
966 .data = &sysctl_perf_event_mlock,
967 .maxlen = sizeof(sysctl_perf_event_mlock),
968 .mode = 0644,
969 .proc_handler = proc_dointvec,
970 },
971 {
972 .procname = "perf_event_max_sample_rate",
973 .data = &sysctl_perf_event_sample_rate,
974 .maxlen = sizeof(sysctl_perf_event_sample_rate),
975 .mode = 0644,
976 .proc_handler = perf_proc_update_handler,
977 },
978#endif
979#ifdef CONFIG_KMEMCHECK
980 {
981 .procname = "kmemcheck",
982 .data = &kmemcheck_enabled,
983 .maxlen = sizeof(int),
984 .mode = 0644,
985 .proc_handler = proc_dointvec,
986 },
987#endif
988#ifdef CONFIG_BLOCK
989 {
990 .procname = "blk_iopoll",
991 .data = &blk_iopoll_enabled,
992 .maxlen = sizeof(int),
993 .mode = 0644,
994 .proc_handler = proc_dointvec,
995 },
996#endif
997 { }
998};
999
1000static struct ctl_table vm_table[] = {
1001 {
1002 .procname = "overcommit_memory",
1003 .data = &sysctl_overcommit_memory,
1004 .maxlen = sizeof(sysctl_overcommit_memory),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec_minmax,
1007 .extra1 = &zero,
1008 .extra2 = &two,
1009 },
1010 {
1011 .procname = "panic_on_oom",
1012 .data = &sysctl_panic_on_oom,
1013 .maxlen = sizeof(sysctl_panic_on_oom),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec_minmax,
1016 .extra1 = &zero,
1017 .extra2 = &two,
1018 },
1019 {
1020 .procname = "oom_kill_allocating_task",
1021 .data = &sysctl_oom_kill_allocating_task,
1022 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1023 .mode = 0644,
1024 .proc_handler = proc_dointvec,
1025 },
1026 {
1027 .procname = "oom_dump_tasks",
1028 .data = &sysctl_oom_dump_tasks,
1029 .maxlen = sizeof(sysctl_oom_dump_tasks),
1030 .mode = 0644,
1031 .proc_handler = proc_dointvec,
1032 },
1033 {
1034 .procname = "overcommit_ratio",
1035 .data = &sysctl_overcommit_ratio,
1036 .maxlen = sizeof(sysctl_overcommit_ratio),
1037 .mode = 0644,
1038 .proc_handler = proc_dointvec,
1039 },
1040 {
1041 .procname = "page-cluster",
1042 .data = &page_cluster,
1043 .maxlen = sizeof(int),
1044 .mode = 0644,
1045 .proc_handler = proc_dointvec_minmax,
1046 .extra1 = &zero,
1047 },
1048 {
1049 .procname = "dirty_background_ratio",
1050 .data = &dirty_background_ratio,
1051 .maxlen = sizeof(dirty_background_ratio),
1052 .mode = 0644,
1053 .proc_handler = dirty_background_ratio_handler,
1054 .extra1 = &zero,
1055 .extra2 = &one_hundred,
1056 },
1057 {
1058 .procname = "dirty_background_bytes",
1059 .data = &dirty_background_bytes,
1060 .maxlen = sizeof(dirty_background_bytes),
1061 .mode = 0644,
1062 .proc_handler = dirty_background_bytes_handler,
1063 .extra1 = &one_ul,
1064 },
1065 {
1066 .procname = "dirty_ratio",
1067 .data = &vm_dirty_ratio,
1068 .maxlen = sizeof(vm_dirty_ratio),
1069 .mode = 0644,
1070 .proc_handler = dirty_ratio_handler,
1071 .extra1 = &zero,
1072 .extra2 = &one_hundred,
1073 },
1074 {
1075 .procname = "dirty_bytes",
1076 .data = &vm_dirty_bytes,
1077 .maxlen = sizeof(vm_dirty_bytes),
1078 .mode = 0644,
1079 .proc_handler = dirty_bytes_handler,
1080 .extra1 = &dirty_bytes_min,
1081 },
1082 {
1083 .procname = "dirty_writeback_centisecs",
1084 .data = &dirty_writeback_interval,
1085 .maxlen = sizeof(dirty_writeback_interval),
1086 .mode = 0644,
1087 .proc_handler = dirty_writeback_centisecs_handler,
1088 },
1089 {
1090 .procname = "dirty_expire_centisecs",
1091 .data = &dirty_expire_interval,
1092 .maxlen = sizeof(dirty_expire_interval),
1093 .mode = 0644,
1094 .proc_handler = proc_dointvec_minmax,
1095 .extra1 = &zero,
1096 },
1097 {
1098 .procname = "nr_pdflush_threads",
1099 .data = &nr_pdflush_threads,
1100 .maxlen = sizeof nr_pdflush_threads,
1101 .mode = 0444 /* read-only*/,
1102 .proc_handler = proc_dointvec,
1103 },
1104 {
1105 .procname = "swappiness",
1106 .data = &vm_swappiness,
1107 .maxlen = sizeof(vm_swappiness),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec_minmax,
1110 .extra1 = &zero,
1111 .extra2 = &one_hundred,
1112 },
1113#ifdef CONFIG_HUGETLB_PAGE
1114 {
1115 .procname = "nr_hugepages",
1116 .data = NULL,
1117 .maxlen = sizeof(unsigned long),
1118 .mode = 0644,
1119 .proc_handler = hugetlb_sysctl_handler,
1120 .extra1 = (void *)&hugetlb_zero,
1121 .extra2 = (void *)&hugetlb_infinity,
1122 },
1123#ifdef CONFIG_NUMA
1124 {
1125 .procname = "nr_hugepages_mempolicy",
1126 .data = NULL,
1127 .maxlen = sizeof(unsigned long),
1128 .mode = 0644,
1129 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1130 .extra1 = (void *)&hugetlb_zero,
1131 .extra2 = (void *)&hugetlb_infinity,
1132 },
1133#endif
1134 {
1135 .procname = "hugetlb_shm_group",
1136 .data = &sysctl_hugetlb_shm_group,
1137 .maxlen = sizeof(gid_t),
1138 .mode = 0644,
1139 .proc_handler = proc_dointvec,
1140 },
1141 {
1142 .procname = "hugepages_treat_as_movable",
1143 .data = &hugepages_treat_as_movable,
1144 .maxlen = sizeof(int),
1145 .mode = 0644,
1146 .proc_handler = hugetlb_treat_movable_handler,
1147 },
1148 {
1149 .procname = "nr_overcommit_hugepages",
1150 .data = NULL,
1151 .maxlen = sizeof(unsigned long),
1152 .mode = 0644,
1153 .proc_handler = hugetlb_overcommit_handler,
1154 .extra1 = (void *)&hugetlb_zero,
1155 .extra2 = (void *)&hugetlb_infinity,
1156 },
1157#endif
1158 {
1159 .procname = "lowmem_reserve_ratio",
1160 .data = &sysctl_lowmem_reserve_ratio,
1161 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1162 .mode = 0644,
1163 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1164 },
1165 {
1166 .procname = "drop_caches",
1167 .data = &sysctl_drop_caches,
1168 .maxlen = sizeof(int),
1169 .mode = 0644,
1170 .proc_handler = drop_caches_sysctl_handler,
1171 .extra1 = &one,
1172 .extra2 = &three,
1173 },
1174#ifdef CONFIG_COMPACTION
1175 {
1176 .procname = "compact_memory",
1177 .data = &sysctl_compact_memory,
1178 .maxlen = sizeof(int),
1179 .mode = 0200,
1180 .proc_handler = sysctl_compaction_handler,
1181 },
1182 {
1183 .procname = "extfrag_threshold",
1184 .data = &sysctl_extfrag_threshold,
1185 .maxlen = sizeof(int),
1186 .mode = 0644,
1187 .proc_handler = sysctl_extfrag_handler,
1188 .extra1 = &min_extfrag_threshold,
1189 .extra2 = &max_extfrag_threshold,
1190 },
1191
1192#endif /* CONFIG_COMPACTION */
1193 {
1194 .procname = "min_free_kbytes",
1195 .data = &min_free_kbytes,
1196 .maxlen = sizeof(min_free_kbytes),
1197 .mode = 0644,
1198 .proc_handler = min_free_kbytes_sysctl_handler,
1199 .extra1 = &zero,
1200 },
1201 {
1202 .procname = "percpu_pagelist_fraction",
1203 .data = &percpu_pagelist_fraction,
1204 .maxlen = sizeof(percpu_pagelist_fraction),
1205 .mode = 0644,
1206 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1207 .extra1 = &min_percpu_pagelist_fract,
1208 },
1209#ifdef CONFIG_MMU
1210 {
1211 .procname = "max_map_count",
1212 .data = &sysctl_max_map_count,
1213 .maxlen = sizeof(sysctl_max_map_count),
1214 .mode = 0644,
1215 .proc_handler = proc_dointvec_minmax,
1216 .extra1 = &zero,
1217 },
1218#else
1219 {
1220 .procname = "nr_trim_pages",
1221 .data = &sysctl_nr_trim_pages,
1222 .maxlen = sizeof(sysctl_nr_trim_pages),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec_minmax,
1225 .extra1 = &zero,
1226 },
1227#endif
1228 {
1229 .procname = "laptop_mode",
1230 .data = &laptop_mode,
1231 .maxlen = sizeof(laptop_mode),
1232 .mode = 0644,
1233 .proc_handler = proc_dointvec_jiffies,
1234 },
1235 {
1236 .procname = "block_dump",
1237 .data = &block_dump,
1238 .maxlen = sizeof(block_dump),
1239 .mode = 0644,
1240 .proc_handler = proc_dointvec,
1241 .extra1 = &zero,
1242 },
1243 {
1244 .procname = "vfs_cache_pressure",
1245 .data = &sysctl_vfs_cache_pressure,
1246 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1247 .mode = 0644,
1248 .proc_handler = proc_dointvec,
1249 .extra1 = &zero,
1250 },
1251#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1252 {
1253 .procname = "legacy_va_layout",
1254 .data = &sysctl_legacy_va_layout,
1255 .maxlen = sizeof(sysctl_legacy_va_layout),
1256 .mode = 0644,
1257 .proc_handler = proc_dointvec,
1258 .extra1 = &zero,
1259 },
1260#endif
1261#ifdef CONFIG_NUMA
1262 {
1263 .procname = "zone_reclaim_mode",
1264 .data = &zone_reclaim_mode,
1265 .maxlen = sizeof(zone_reclaim_mode),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec,
1268 .extra1 = &zero,
1269 },
1270 {
1271 .procname = "min_unmapped_ratio",
1272 .data = &sysctl_min_unmapped_ratio,
1273 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1274 .mode = 0644,
1275 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1276 .extra1 = &zero,
1277 .extra2 = &one_hundred,
1278 },
1279 {
1280 .procname = "min_slab_ratio",
1281 .data = &sysctl_min_slab_ratio,
1282 .maxlen = sizeof(sysctl_min_slab_ratio),
1283 .mode = 0644,
1284 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1285 .extra1 = &zero,
1286 .extra2 = &one_hundred,
1287 },
1288#endif
1289#ifdef CONFIG_SMP
1290 {
1291 .procname = "stat_interval",
1292 .data = &sysctl_stat_interval,
1293 .maxlen = sizeof(sysctl_stat_interval),
1294 .mode = 0644,
1295 .proc_handler = proc_dointvec_jiffies,
1296 },
1297#endif
1298#ifdef CONFIG_MMU
1299 {
1300 .procname = "mmap_min_addr",
1301 .data = &dac_mmap_min_addr,
1302 .maxlen = sizeof(unsigned long),
1303 .mode = 0644,
1304 .proc_handler = mmap_min_addr_handler,
1305 },
1306#endif
1307#ifdef CONFIG_NUMA
1308 {
1309 .procname = "numa_zonelist_order",
1310 .data = &numa_zonelist_order,
1311 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1312 .mode = 0644,
1313 .proc_handler = numa_zonelist_order_handler,
1314 },
1315#endif
1316#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1317 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1318 {
1319 .procname = "vdso_enabled",
1320 .data = &vdso_enabled,
1321 .maxlen = sizeof(vdso_enabled),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec,
1324 .extra1 = &zero,
1325 },
1326#endif
1327#ifdef CONFIG_HIGHMEM
1328 {
1329 .procname = "highmem_is_dirtyable",
1330 .data = &vm_highmem_is_dirtyable,
1331 .maxlen = sizeof(vm_highmem_is_dirtyable),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec_minmax,
1334 .extra1 = &zero,
1335 .extra2 = &one,
1336 },
1337#endif
1338 {
1339 .procname = "scan_unevictable_pages",
1340 .data = &scan_unevictable_pages,
1341 .maxlen = sizeof(scan_unevictable_pages),
1342 .mode = 0644,
1343 .proc_handler = scan_unevictable_handler,
1344 },
1345#ifdef CONFIG_MEMORY_FAILURE
1346 {
1347 .procname = "memory_failure_early_kill",
1348 .data = &sysctl_memory_failure_early_kill,
1349 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1350 .mode = 0644,
1351 .proc_handler = proc_dointvec_minmax,
1352 .extra1 = &zero,
1353 .extra2 = &one,
1354 },
1355 {
1356 .procname = "memory_failure_recovery",
1357 .data = &sysctl_memory_failure_recovery,
1358 .maxlen = sizeof(sysctl_memory_failure_recovery),
1359 .mode = 0644,
1360 .proc_handler = proc_dointvec_minmax,
1361 .extra1 = &zero,
1362 .extra2 = &one,
1363 },
1364#endif
1365 { }
1366};
1367
1368#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1369static struct ctl_table binfmt_misc_table[] = {
1370 { }
1371};
1372#endif
1373
1374static struct ctl_table fs_table[] = {
1375 {
1376 .procname = "inode-nr",
1377 .data = &inodes_stat,
1378 .maxlen = 2*sizeof(int),
1379 .mode = 0444,
1380 .proc_handler = proc_nr_inodes,
1381 },
1382 {
1383 .procname = "inode-state",
1384 .data = &inodes_stat,
1385 .maxlen = 7*sizeof(int),
1386 .mode = 0444,
1387 .proc_handler = proc_nr_inodes,
1388 },
1389 {
1390 .procname = "file-nr",
1391 .data = &files_stat,
1392 .maxlen = sizeof(files_stat),
1393 .mode = 0444,
1394 .proc_handler = proc_nr_files,
1395 },
1396 {
1397 .procname = "file-max",
1398 .data = &files_stat.max_files,
1399 .maxlen = sizeof(files_stat.max_files),
1400 .mode = 0644,
1401 .proc_handler = proc_doulongvec_minmax,
1402 },
1403 {
1404 .procname = "nr_open",
1405 .data = &sysctl_nr_open,
1406 .maxlen = sizeof(int),
1407 .mode = 0644,
1408 .proc_handler = proc_dointvec_minmax,
1409 .extra1 = &sysctl_nr_open_min,
1410 .extra2 = &sysctl_nr_open_max,
1411 },
1412 {
1413 .procname = "dentry-state",
1414 .data = &dentry_stat,
1415 .maxlen = 6*sizeof(int),
1416 .mode = 0444,
1417 .proc_handler = proc_nr_dentry,
1418 },
1419 {
1420 .procname = "overflowuid",
1421 .data = &fs_overflowuid,
1422 .maxlen = sizeof(int),
1423 .mode = 0644,
1424 .proc_handler = proc_dointvec_minmax,
1425 .extra1 = &minolduid,
1426 .extra2 = &maxolduid,
1427 },
1428 {
1429 .procname = "overflowgid",
1430 .data = &fs_overflowgid,
1431 .maxlen = sizeof(int),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec_minmax,
1434 .extra1 = &minolduid,
1435 .extra2 = &maxolduid,
1436 },
1437#ifdef CONFIG_FILE_LOCKING
1438 {
1439 .procname = "leases-enable",
1440 .data = &leases_enable,
1441 .maxlen = sizeof(int),
1442 .mode = 0644,
1443 .proc_handler = proc_dointvec,
1444 },
1445#endif
1446#ifdef CONFIG_DNOTIFY
1447 {
1448 .procname = "dir-notify-enable",
1449 .data = &dir_notify_enable,
1450 .maxlen = sizeof(int),
1451 .mode = 0644,
1452 .proc_handler = proc_dointvec,
1453 },
1454#endif
1455#ifdef CONFIG_MMU
1456#ifdef CONFIG_FILE_LOCKING
1457 {
1458 .procname = "lease-break-time",
1459 .data = &lease_break_time,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec,
1463 },
1464#endif
1465#ifdef CONFIG_AIO
1466 {
1467 .procname = "aio-nr",
1468 .data = &aio_nr,
1469 .maxlen = sizeof(aio_nr),
1470 .mode = 0444,
1471 .proc_handler = proc_doulongvec_minmax,
1472 },
1473 {
1474 .procname = "aio-max-nr",
1475 .data = &aio_max_nr,
1476 .maxlen = sizeof(aio_max_nr),
1477 .mode = 0644,
1478 .proc_handler = proc_doulongvec_minmax,
1479 },
1480#endif /* CONFIG_AIO */
1481#ifdef CONFIG_INOTIFY_USER
1482 {
1483 .procname = "inotify",
1484 .mode = 0555,
1485 .child = inotify_table,
1486 },
1487#endif
1488#ifdef CONFIG_EPOLL
1489 {
1490 .procname = "epoll",
1491 .mode = 0555,
1492 .child = epoll_table,
1493 },
1494#endif
1495#endif
1496 {
1497 .procname = "suid_dumpable",
1498 .data = &suid_dumpable,
1499 .maxlen = sizeof(int),
1500 .mode = 0644,
1501 .proc_handler = proc_dointvec_minmax,
1502 .extra1 = &zero,
1503 .extra2 = &two,
1504 },
1505#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1506 {
1507 .procname = "binfmt_misc",
1508 .mode = 0555,
1509 .child = binfmt_misc_table,
1510 },
1511#endif
1512 {
1513 .procname = "pipe-max-size",
1514 .data = &pipe_max_size,
1515 .maxlen = sizeof(int),
1516 .mode = 0644,
1517 .proc_handler = &pipe_proc_fn,
1518 .extra1 = &pipe_min_size,
1519 },
1520 { }
1521};
1522
1523static struct ctl_table debug_table[] = {
1524#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1525 defined(CONFIG_S390) || defined(CONFIG_TILE)
1526 {
1527 .procname = "exception-trace",
1528 .data = &show_unhandled_signals,
1529 .maxlen = sizeof(int),
1530 .mode = 0644,
1531 .proc_handler = proc_dointvec
1532 },
1533#endif
1534#if defined(CONFIG_OPTPROBES)
1535 {
1536 .procname = "kprobes-optimization",
1537 .data = &sysctl_kprobes_optimization,
1538 .maxlen = sizeof(int),
1539 .mode = 0644,
1540 .proc_handler = proc_kprobes_optimization_handler,
1541 .extra1 = &zero,
1542 .extra2 = &one,
1543 },
1544#endif
1545 { }
1546};
1547
1548static struct ctl_table dev_table[] = {
1549 { }
1550};
1551
1552int __init sysctl_init(void)
1553{
1554 register_sysctl_table(sysctl_base_table);
1555 return 0;
1556}
1557
1558#endif /* CONFIG_SYSCTL */
1559
1560/*
1561 * /proc/sys support
1562 */
1563
1564#ifdef CONFIG_PROC_SYSCTL
1565
1566static int _proc_do_string(void* data, int maxlen, int write,
1567 void __user *buffer,
1568 size_t *lenp, loff_t *ppos)
1569{
1570 size_t len;
1571 char __user *p;
1572 char c;
1573
1574 if (!data || !maxlen || !*lenp) {
1575 *lenp = 0;
1576 return 0;
1577 }
1578
1579 if (write) {
1580 len = 0;
1581 p = buffer;
1582 while (len < *lenp) {
1583 if (get_user(c, p++))
1584 return -EFAULT;
1585 if (c == 0 || c == '\n')
1586 break;
1587 len++;
1588 }
1589 if (len >= maxlen)
1590 len = maxlen-1;
1591 if(copy_from_user(data, buffer, len))
1592 return -EFAULT;
1593 ((char *) data)[len] = 0;
1594 *ppos += *lenp;
1595 } else {
1596 len = strlen(data);
1597 if (len > maxlen)
1598 len = maxlen;
1599
1600 if (*ppos > len) {
1601 *lenp = 0;
1602 return 0;
1603 }
1604
1605 data += *ppos;
1606 len -= *ppos;
1607
1608 if (len > *lenp)
1609 len = *lenp;
1610 if (len)
1611 if(copy_to_user(buffer, data, len))
1612 return -EFAULT;
1613 if (len < *lenp) {
1614 if(put_user('\n', ((char __user *) buffer) + len))
1615 return -EFAULT;
1616 len++;
1617 }
1618 *lenp = len;
1619 *ppos += len;
1620 }
1621 return 0;
1622}
1623
1624/**
1625 * proc_dostring - read a string sysctl
1626 * @table: the sysctl table
1627 * @write: %TRUE if this is a write to the sysctl file
1628 * @buffer: the user buffer
1629 * @lenp: the size of the user buffer
1630 * @ppos: file position
1631 *
1632 * Reads/writes a string from/to the user buffer. If the kernel
1633 * buffer provided is not large enough to hold the string, the
1634 * string is truncated. The copied string is %NULL-terminated.
1635 * If the string is being read by the user process, it is copied
1636 * and a newline '\n' is added. It is truncated if the buffer is
1637 * not large enough.
1638 *
1639 * Returns 0 on success.
1640 */
1641int proc_dostring(struct ctl_table *table, int write,
1642 void __user *buffer, size_t *lenp, loff_t *ppos)
1643{
1644 return _proc_do_string(table->data, table->maxlen, write,
1645 buffer, lenp, ppos);
1646}
1647
1648static size_t proc_skip_spaces(char **buf)
1649{
1650 size_t ret;
1651 char *tmp = skip_spaces(*buf);
1652 ret = tmp - *buf;
1653 *buf = tmp;
1654 return ret;
1655}
1656
1657static void proc_skip_char(char **buf, size_t *size, const char v)
1658{
1659 while (*size) {
1660 if (**buf != v)
1661 break;
1662 (*size)--;
1663 (*buf)++;
1664 }
1665}
1666
1667#define TMPBUFLEN 22
1668/**
1669 * proc_get_long - reads an ASCII formatted integer from a user buffer
1670 *
1671 * @buf: a kernel buffer
1672 * @size: size of the kernel buffer
1673 * @val: this is where the number will be stored
1674 * @neg: set to %TRUE if number is negative
1675 * @perm_tr: a vector which contains the allowed trailers
1676 * @perm_tr_len: size of the perm_tr vector
1677 * @tr: pointer to store the trailer character
1678 *
1679 * In case of success %0 is returned and @buf and @size are updated with
1680 * the amount of bytes read. If @tr is non-NULL and a trailing
1681 * character exists (size is non-zero after returning from this
1682 * function), @tr is updated with the trailing character.
1683 */
1684static int proc_get_long(char **buf, size_t *size,
1685 unsigned long *val, bool *neg,
1686 const char *perm_tr, unsigned perm_tr_len, char *tr)
1687{
1688 int len;
1689 char *p, tmp[TMPBUFLEN];
1690
1691 if (!*size)
1692 return -EINVAL;
1693
1694 len = *size;
1695 if (len > TMPBUFLEN - 1)
1696 len = TMPBUFLEN - 1;
1697
1698 memcpy(tmp, *buf, len);
1699
1700 tmp[len] = 0;
1701 p = tmp;
1702 if (*p == '-' && *size > 1) {
1703 *neg = true;
1704 p++;
1705 } else
1706 *neg = false;
1707 if (!isdigit(*p))
1708 return -EINVAL;
1709
1710 *val = simple_strtoul(p, &p, 0);
1711
1712 len = p - tmp;
1713
1714 /* We don't know if the next char is whitespace thus we may accept
1715 * invalid integers (e.g. 1234...a) or two integers instead of one
1716 * (e.g. 123...1). So lets not allow such large numbers. */
1717 if (len == TMPBUFLEN - 1)
1718 return -EINVAL;
1719
1720 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1721 return -EINVAL;
1722
1723 if (tr && (len < *size))
1724 *tr = *p;
1725
1726 *buf += len;
1727 *size -= len;
1728
1729 return 0;
1730}
1731
1732/**
1733 * proc_put_long - converts an integer to a decimal ASCII formatted string
1734 *
1735 * @buf: the user buffer
1736 * @size: the size of the user buffer
1737 * @val: the integer to be converted
1738 * @neg: sign of the number, %TRUE for negative
1739 *
1740 * In case of success %0 is returned and @buf and @size are updated with
1741 * the amount of bytes written.
1742 */
1743static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1744 bool neg)
1745{
1746 int len;
1747 char tmp[TMPBUFLEN], *p = tmp;
1748
1749 sprintf(p, "%s%lu", neg ? "-" : "", val);
1750 len = strlen(tmp);
1751 if (len > *size)
1752 len = *size;
1753 if (copy_to_user(*buf, tmp, len))
1754 return -EFAULT;
1755 *size -= len;
1756 *buf += len;
1757 return 0;
1758}
1759#undef TMPBUFLEN
1760
1761static int proc_put_char(void __user **buf, size_t *size, char c)
1762{
1763 if (*size) {
1764 char __user **buffer = (char __user **)buf;
1765 if (put_user(c, *buffer))
1766 return -EFAULT;
1767 (*size)--, (*buffer)++;
1768 *buf = *buffer;
1769 }
1770 return 0;
1771}
1772
1773static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1774 int *valp,
1775 int write, void *data)
1776{
1777 if (write) {
1778 *valp = *negp ? -*lvalp : *lvalp;
1779 } else {
1780 int val = *valp;
1781 if (val < 0) {
1782 *negp = true;
1783 *lvalp = (unsigned long)-val;
1784 } else {
1785 *negp = false;
1786 *lvalp = (unsigned long)val;
1787 }
1788 }
1789 return 0;
1790}
1791
1792static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1793
1794static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1795 int write, void __user *buffer,
1796 size_t *lenp, loff_t *ppos,
1797 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1798 int write, void *data),
1799 void *data)
1800{
1801 int *i, vleft, first = 1, err = 0;
1802 unsigned long page = 0;
1803 size_t left;
1804 char *kbuf;
1805
1806 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1807 *lenp = 0;
1808 return 0;
1809 }
1810
1811 i = (int *) tbl_data;
1812 vleft = table->maxlen / sizeof(*i);
1813 left = *lenp;
1814
1815 if (!conv)
1816 conv = do_proc_dointvec_conv;
1817
1818 if (write) {
1819 if (left > PAGE_SIZE - 1)
1820 left = PAGE_SIZE - 1;
1821 page = __get_free_page(GFP_TEMPORARY);
1822 kbuf = (char *) page;
1823 if (!kbuf)
1824 return -ENOMEM;
1825 if (copy_from_user(kbuf, buffer, left)) {
1826 err = -EFAULT;
1827 goto free;
1828 }
1829 kbuf[left] = 0;
1830 }
1831
1832 for (; left && vleft--; i++, first=0) {
1833 unsigned long lval;
1834 bool neg;
1835
1836 if (write) {
1837 left -= proc_skip_spaces(&kbuf);
1838
1839 if (!left)
1840 break;
1841 err = proc_get_long(&kbuf, &left, &lval, &neg,
1842 proc_wspace_sep,
1843 sizeof(proc_wspace_sep), NULL);
1844 if (err)
1845 break;
1846 if (conv(&neg, &lval, i, 1, data)) {
1847 err = -EINVAL;
1848 break;
1849 }
1850 } else {
1851 if (conv(&neg, &lval, i, 0, data)) {
1852 err = -EINVAL;
1853 break;
1854 }
1855 if (!first)
1856 err = proc_put_char(&buffer, &left, '\t');
1857 if (err)
1858 break;
1859 err = proc_put_long(&buffer, &left, lval, neg);
1860 if (err)
1861 break;
1862 }
1863 }
1864
1865 if (!write && !first && left && !err)
1866 err = proc_put_char(&buffer, &left, '\n');
1867 if (write && !err && left)
1868 left -= proc_skip_spaces(&kbuf);
1869free:
1870 if (write) {
1871 free_page(page);
1872 if (first)
1873 return err ? : -EINVAL;
1874 }
1875 *lenp -= left;
1876 *ppos += *lenp;
1877 return err;
1878}
1879
1880static int do_proc_dointvec(struct ctl_table *table, int write,
1881 void __user *buffer, size_t *lenp, loff_t *ppos,
1882 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1883 int write, void *data),
1884 void *data)
1885{
1886 return __do_proc_dointvec(table->data, table, write,
1887 buffer, lenp, ppos, conv, data);
1888}
1889
1890/**
1891 * proc_dointvec - read a vector of integers
1892 * @table: the sysctl table
1893 * @write: %TRUE if this is a write to the sysctl file
1894 * @buffer: the user buffer
1895 * @lenp: the size of the user buffer
1896 * @ppos: file position
1897 *
1898 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1899 * values from/to the user buffer, treated as an ASCII string.
1900 *
1901 * Returns 0 on success.
1902 */
1903int proc_dointvec(struct ctl_table *table, int write,
1904 void __user *buffer, size_t *lenp, loff_t *ppos)
1905{
1906 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1907 NULL,NULL);
1908}
1909
1910/*
1911 * Taint values can only be increased
1912 * This means we can safely use a temporary.
1913 */
1914static int proc_taint(struct ctl_table *table, int write,
1915 void __user *buffer, size_t *lenp, loff_t *ppos)
1916{
1917 struct ctl_table t;
1918 unsigned long tmptaint = get_taint();
1919 int err;
1920
1921 if (write && !capable(CAP_SYS_ADMIN))
1922 return -EPERM;
1923
1924 t = *table;
1925 t.data = &tmptaint;
1926 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1927 if (err < 0)
1928 return err;
1929
1930 if (write) {
1931 /*
1932 * Poor man's atomic or. Not worth adding a primitive
1933 * to everyone's atomic.h for this
1934 */
1935 int i;
1936 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1937 if ((tmptaint >> i) & 1)
1938 add_taint(i);
1939 }
1940 }
1941
1942 return err;
1943}
1944
1945#ifdef CONFIG_PRINTK
1946static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1947 void __user *buffer, size_t *lenp, loff_t *ppos)
1948{
1949 if (write && !capable(CAP_SYS_ADMIN))
1950 return -EPERM;
1951
1952 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1953}
1954#endif
1955
1956struct do_proc_dointvec_minmax_conv_param {
1957 int *min;
1958 int *max;
1959};
1960
1961static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1962 int *valp,
1963 int write, void *data)
1964{
1965 struct do_proc_dointvec_minmax_conv_param *param = data;
1966 if (write) {
1967 int val = *negp ? -*lvalp : *lvalp;
1968 if ((param->min && *param->min > val) ||
1969 (param->max && *param->max < val))
1970 return -EINVAL;
1971 *valp = val;
1972 } else {
1973 int val = *valp;
1974 if (val < 0) {
1975 *negp = true;
1976 *lvalp = (unsigned long)-val;
1977 } else {
1978 *negp = false;
1979 *lvalp = (unsigned long)val;
1980 }
1981 }
1982 return 0;
1983}
1984
1985/**
1986 * proc_dointvec_minmax - read a vector of integers with min/max values
1987 * @table: the sysctl table
1988 * @write: %TRUE if this is a write to the sysctl file
1989 * @buffer: the user buffer
1990 * @lenp: the size of the user buffer
1991 * @ppos: file position
1992 *
1993 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1994 * values from/to the user buffer, treated as an ASCII string.
1995 *
1996 * This routine will ensure the values are within the range specified by
1997 * table->extra1 (min) and table->extra2 (max).
1998 *
1999 * Returns 0 on success.
2000 */
2001int proc_dointvec_minmax(struct ctl_table *table, int write,
2002 void __user *buffer, size_t *lenp, loff_t *ppos)
2003{
2004 struct do_proc_dointvec_minmax_conv_param param = {
2005 .min = (int *) table->extra1,
2006 .max = (int *) table->extra2,
2007 };
2008 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2009 do_proc_dointvec_minmax_conv, ¶m);
2010}
2011
2012static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2013 void __user *buffer,
2014 size_t *lenp, loff_t *ppos,
2015 unsigned long convmul,
2016 unsigned long convdiv)
2017{
2018 unsigned long *i, *min, *max;
2019 int vleft, first = 1, err = 0;
2020 unsigned long page = 0;
2021 size_t left;
2022 char *kbuf;
2023
2024 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2025 *lenp = 0;
2026 return 0;
2027 }
2028
2029 i = (unsigned long *) data;
2030 min = (unsigned long *) table->extra1;
2031 max = (unsigned long *) table->extra2;
2032 vleft = table->maxlen / sizeof(unsigned long);
2033 left = *lenp;
2034
2035 if (write) {
2036 if (left > PAGE_SIZE - 1)
2037 left = PAGE_SIZE - 1;
2038 page = __get_free_page(GFP_TEMPORARY);
2039 kbuf = (char *) page;
2040 if (!kbuf)
2041 return -ENOMEM;
2042 if (copy_from_user(kbuf, buffer, left)) {
2043 err = -EFAULT;
2044 goto free;
2045 }
2046 kbuf[left] = 0;
2047 }
2048
2049 for (; left && vleft--; i++, first = 0) {
2050 unsigned long val;
2051
2052 if (write) {
2053 bool neg;
2054
2055 left -= proc_skip_spaces(&kbuf);
2056
2057 err = proc_get_long(&kbuf, &left, &val, &neg,
2058 proc_wspace_sep,
2059 sizeof(proc_wspace_sep), NULL);
2060 if (err)
2061 break;
2062 if (neg)
2063 continue;
2064 if ((min && val < *min) || (max && val > *max))
2065 continue;
2066 *i = val;
2067 } else {
2068 val = convdiv * (*i) / convmul;
2069 if (!first)
2070 err = proc_put_char(&buffer, &left, '\t');
2071 err = proc_put_long(&buffer, &left, val, false);
2072 if (err)
2073 break;
2074 }
2075 }
2076
2077 if (!write && !first && left && !err)
2078 err = proc_put_char(&buffer, &left, '\n');
2079 if (write && !err)
2080 left -= proc_skip_spaces(&kbuf);
2081free:
2082 if (write) {
2083 free_page(page);
2084 if (first)
2085 return err ? : -EINVAL;
2086 }
2087 *lenp -= left;
2088 *ppos += *lenp;
2089 return err;
2090}
2091
2092static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2093 void __user *buffer,
2094 size_t *lenp, loff_t *ppos,
2095 unsigned long convmul,
2096 unsigned long convdiv)
2097{
2098 return __do_proc_doulongvec_minmax(table->data, table, write,
2099 buffer, lenp, ppos, convmul, convdiv);
2100}
2101
2102/**
2103 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2104 * @table: the sysctl table
2105 * @write: %TRUE if this is a write to the sysctl file
2106 * @buffer: the user buffer
2107 * @lenp: the size of the user buffer
2108 * @ppos: file position
2109 *
2110 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2111 * values from/to the user buffer, treated as an ASCII string.
2112 *
2113 * This routine will ensure the values are within the range specified by
2114 * table->extra1 (min) and table->extra2 (max).
2115 *
2116 * Returns 0 on success.
2117 */
2118int proc_doulongvec_minmax(struct ctl_table *table, int write,
2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2120{
2121 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2122}
2123
2124/**
2125 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2126 * @table: the sysctl table
2127 * @write: %TRUE if this is a write to the sysctl file
2128 * @buffer: the user buffer
2129 * @lenp: the size of the user buffer
2130 * @ppos: file position
2131 *
2132 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2133 * values from/to the user buffer, treated as an ASCII string. The values
2134 * are treated as milliseconds, and converted to jiffies when they are stored.
2135 *
2136 * This routine will ensure the values are within the range specified by
2137 * table->extra1 (min) and table->extra2 (max).
2138 *
2139 * Returns 0 on success.
2140 */
2141int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2142 void __user *buffer,
2143 size_t *lenp, loff_t *ppos)
2144{
2145 return do_proc_doulongvec_minmax(table, write, buffer,
2146 lenp, ppos, HZ, 1000l);
2147}
2148
2149
2150static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2151 int *valp,
2152 int write, void *data)
2153{
2154 if (write) {
2155 if (*lvalp > LONG_MAX / HZ)
2156 return 1;
2157 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2158 } else {
2159 int val = *valp;
2160 unsigned long lval;
2161 if (val < 0) {
2162 *negp = true;
2163 lval = (unsigned long)-val;
2164 } else {
2165 *negp = false;
2166 lval = (unsigned long)val;
2167 }
2168 *lvalp = lval / HZ;
2169 }
2170 return 0;
2171}
2172
2173static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2174 int *valp,
2175 int write, void *data)
2176{
2177 if (write) {
2178 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2179 return 1;
2180 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2181 } else {
2182 int val = *valp;
2183 unsigned long lval;
2184 if (val < 0) {
2185 *negp = true;
2186 lval = (unsigned long)-val;
2187 } else {
2188 *negp = false;
2189 lval = (unsigned long)val;
2190 }
2191 *lvalp = jiffies_to_clock_t(lval);
2192 }
2193 return 0;
2194}
2195
2196static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2197 int *valp,
2198 int write, void *data)
2199{
2200 if (write) {
2201 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2202 } else {
2203 int val = *valp;
2204 unsigned long lval;
2205 if (val < 0) {
2206 *negp = true;
2207 lval = (unsigned long)-val;
2208 } else {
2209 *negp = false;
2210 lval = (unsigned long)val;
2211 }
2212 *lvalp = jiffies_to_msecs(lval);
2213 }
2214 return 0;
2215}
2216
2217/**
2218 * proc_dointvec_jiffies - read a vector of integers as seconds
2219 * @table: the sysctl table
2220 * @write: %TRUE if this is a write to the sysctl file
2221 * @buffer: the user buffer
2222 * @lenp: the size of the user buffer
2223 * @ppos: file position
2224 *
2225 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2226 * values from/to the user buffer, treated as an ASCII string.
2227 * The values read are assumed to be in seconds, and are converted into
2228 * jiffies.
2229 *
2230 * Returns 0 on success.
2231 */
2232int proc_dointvec_jiffies(struct ctl_table *table, int write,
2233 void __user *buffer, size_t *lenp, loff_t *ppos)
2234{
2235 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2236 do_proc_dointvec_jiffies_conv,NULL);
2237}
2238
2239/**
2240 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2241 * @table: the sysctl table
2242 * @write: %TRUE if this is a write to the sysctl file
2243 * @buffer: the user buffer
2244 * @lenp: the size of the user buffer
2245 * @ppos: pointer to the file position
2246 *
2247 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2248 * values from/to the user buffer, treated as an ASCII string.
2249 * The values read are assumed to be in 1/USER_HZ seconds, and
2250 * are converted into jiffies.
2251 *
2252 * Returns 0 on success.
2253 */
2254int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2255 void __user *buffer, size_t *lenp, loff_t *ppos)
2256{
2257 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2258 do_proc_dointvec_userhz_jiffies_conv,NULL);
2259}
2260
2261/**
2262 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2263 * @table: the sysctl table
2264 * @write: %TRUE if this is a write to the sysctl file
2265 * @buffer: the user buffer
2266 * @lenp: the size of the user buffer
2267 * @ppos: file position
2268 * @ppos: the current position in the file
2269 *
2270 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2271 * values from/to the user buffer, treated as an ASCII string.
2272 * The values read are assumed to be in 1/1000 seconds, and
2273 * are converted into jiffies.
2274 *
2275 * Returns 0 on success.
2276 */
2277int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2278 void __user *buffer, size_t *lenp, loff_t *ppos)
2279{
2280 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2281 do_proc_dointvec_ms_jiffies_conv, NULL);
2282}
2283
2284static int proc_do_cad_pid(struct ctl_table *table, int write,
2285 void __user *buffer, size_t *lenp, loff_t *ppos)
2286{
2287 struct pid *new_pid;
2288 pid_t tmp;
2289 int r;
2290
2291 tmp = pid_vnr(cad_pid);
2292
2293 r = __do_proc_dointvec(&tmp, table, write, buffer,
2294 lenp, ppos, NULL, NULL);
2295 if (r || !write)
2296 return r;
2297
2298 new_pid = find_get_pid(tmp);
2299 if (!new_pid)
2300 return -ESRCH;
2301
2302 put_pid(xchg(&cad_pid, new_pid));
2303 return 0;
2304}
2305
2306/**
2307 * proc_do_large_bitmap - read/write from/to a large bitmap
2308 * @table: the sysctl table
2309 * @write: %TRUE if this is a write to the sysctl file
2310 * @buffer: the user buffer
2311 * @lenp: the size of the user buffer
2312 * @ppos: file position
2313 *
2314 * The bitmap is stored at table->data and the bitmap length (in bits)
2315 * in table->maxlen.
2316 *
2317 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2318 * large bitmaps may be represented in a compact manner. Writing into
2319 * the file will clear the bitmap then update it with the given input.
2320 *
2321 * Returns 0 on success.
2322 */
2323int proc_do_large_bitmap(struct ctl_table *table, int write,
2324 void __user *buffer, size_t *lenp, loff_t *ppos)
2325{
2326 int err = 0;
2327 bool first = 1;
2328 size_t left = *lenp;
2329 unsigned long bitmap_len = table->maxlen;
2330 unsigned long *bitmap = (unsigned long *) table->data;
2331 unsigned long *tmp_bitmap = NULL;
2332 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2333
2334 if (!bitmap_len || !left || (*ppos && !write)) {
2335 *lenp = 0;
2336 return 0;
2337 }
2338
2339 if (write) {
2340 unsigned long page = 0;
2341 char *kbuf;
2342
2343 if (left > PAGE_SIZE - 1)
2344 left = PAGE_SIZE - 1;
2345
2346 page = __get_free_page(GFP_TEMPORARY);
2347 kbuf = (char *) page;
2348 if (!kbuf)
2349 return -ENOMEM;
2350 if (copy_from_user(kbuf, buffer, left)) {
2351 free_page(page);
2352 return -EFAULT;
2353 }
2354 kbuf[left] = 0;
2355
2356 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2357 GFP_KERNEL);
2358 if (!tmp_bitmap) {
2359 free_page(page);
2360 return -ENOMEM;
2361 }
2362 proc_skip_char(&kbuf, &left, '\n');
2363 while (!err && left) {
2364 unsigned long val_a, val_b;
2365 bool neg;
2366
2367 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2368 sizeof(tr_a), &c);
2369 if (err)
2370 break;
2371 if (val_a >= bitmap_len || neg) {
2372 err = -EINVAL;
2373 break;
2374 }
2375
2376 val_b = val_a;
2377 if (left) {
2378 kbuf++;
2379 left--;
2380 }
2381
2382 if (c == '-') {
2383 err = proc_get_long(&kbuf, &left, &val_b,
2384 &neg, tr_b, sizeof(tr_b),
2385 &c);
2386 if (err)
2387 break;
2388 if (val_b >= bitmap_len || neg ||
2389 val_a > val_b) {
2390 err = -EINVAL;
2391 break;
2392 }
2393 if (left) {
2394 kbuf++;
2395 left--;
2396 }
2397 }
2398
2399 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2400 first = 0;
2401 proc_skip_char(&kbuf, &left, '\n');
2402 }
2403 free_page(page);
2404 } else {
2405 unsigned long bit_a, bit_b = 0;
2406
2407 while (left) {
2408 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2409 if (bit_a >= bitmap_len)
2410 break;
2411 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2412 bit_a + 1) - 1;
2413
2414 if (!first) {
2415 err = proc_put_char(&buffer, &left, ',');
2416 if (err)
2417 break;
2418 }
2419 err = proc_put_long(&buffer, &left, bit_a, false);
2420 if (err)
2421 break;
2422 if (bit_a != bit_b) {
2423 err = proc_put_char(&buffer, &left, '-');
2424 if (err)
2425 break;
2426 err = proc_put_long(&buffer, &left, bit_b, false);
2427 if (err)
2428 break;
2429 }
2430
2431 first = 0; bit_b++;
2432 }
2433 if (!err)
2434 err = proc_put_char(&buffer, &left, '\n');
2435 }
2436
2437 if (!err) {
2438 if (write) {
2439 if (*ppos)
2440 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2441 else
2442 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2443 }
2444 kfree(tmp_bitmap);
2445 *lenp -= left;
2446 *ppos += *lenp;
2447 return 0;
2448 } else {
2449 kfree(tmp_bitmap);
2450 return err;
2451 }
2452}
2453
2454#else /* CONFIG_PROC_SYSCTL */
2455
2456int proc_dostring(struct ctl_table *table, int write,
2457 void __user *buffer, size_t *lenp, loff_t *ppos)
2458{
2459 return -ENOSYS;
2460}
2461
2462int proc_dointvec(struct ctl_table *table, int write,
2463 void __user *buffer, size_t *lenp, loff_t *ppos)
2464{
2465 return -ENOSYS;
2466}
2467
2468int proc_dointvec_minmax(struct ctl_table *table, int write,
2469 void __user *buffer, size_t *lenp, loff_t *ppos)
2470{
2471 return -ENOSYS;
2472}
2473
2474int proc_dointvec_jiffies(struct ctl_table *table, int write,
2475 void __user *buffer, size_t *lenp, loff_t *ppos)
2476{
2477 return -ENOSYS;
2478}
2479
2480int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2481 void __user *buffer, size_t *lenp, loff_t *ppos)
2482{
2483 return -ENOSYS;
2484}
2485
2486int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2487 void __user *buffer, size_t *lenp, loff_t *ppos)
2488{
2489 return -ENOSYS;
2490}
2491
2492int proc_doulongvec_minmax(struct ctl_table *table, int write,
2493 void __user *buffer, size_t *lenp, loff_t *ppos)
2494{
2495 return -ENOSYS;
2496}
2497
2498int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2499 void __user *buffer,
2500 size_t *lenp, loff_t *ppos)
2501{
2502 return -ENOSYS;
2503}
2504
2505
2506#endif /* CONFIG_PROC_SYSCTL */
2507
2508/*
2509 * No sense putting this after each symbol definition, twice,
2510 * exception granted :-)
2511 */
2512EXPORT_SYMBOL(proc_dointvec);
2513EXPORT_SYMBOL(proc_dointvec_jiffies);
2514EXPORT_SYMBOL(proc_dointvec_minmax);
2515EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2516EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2517EXPORT_SYMBOL(proc_dostring);
2518EXPORT_SYMBOL(proc_doulongvec_minmax);
2519EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);