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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// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sysctl.c: General linux system control interface
4 *
5 * Begun 24 March 1995, Stephen Tweedie
6 * Added /proc support, Dec 1995
7 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
8 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
9 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
10 * Dynamic registration fixes, Stephen Tweedie.
11 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
12 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Horn.
14 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
15 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
16 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * Wendling.
18 * The list_for_each() macro wasn't appropriate for the sysctl loop.
19 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
20 */
21
22#include <linux/module.h>
23#include <linux/mm.h>
24#include <linux/swap.h>
25#include <linux/slab.h>
26#include <linux/sysctl.h>
27#include <linux/bitmap.h>
28#include <linux/signal.h>
29#include <linux/panic.h>
30#include <linux/printk.h>
31#include <linux/proc_fs.h>
32#include <linux/security.h>
33#include <linux/ctype.h>
34#include <linux/kmemleak.h>
35#include <linux/filter.h>
36#include <linux/fs.h>
37#include <linux/init.h>
38#include <linux/kernel.h>
39#include <linux/kobject.h>
40#include <linux/net.h>
41#include <linux/sysrq.h>
42#include <linux/highuid.h>
43#include <linux/writeback.h>
44#include <linux/ratelimit.h>
45#include <linux/hugetlb.h>
46#include <linux/initrd.h>
47#include <linux/key.h>
48#include <linux/times.h>
49#include <linux/limits.h>
50#include <linux/dcache.h>
51#include <linux/syscalls.h>
52#include <linux/vmstat.h>
53#include <linux/nfs_fs.h>
54#include <linux/acpi.h>
55#include <linux/reboot.h>
56#include <linux/ftrace.h>
57#include <linux/perf_event.h>
58#include <linux/oom.h>
59#include <linux/kmod.h>
60#include <linux/capability.h>
61#include <linux/binfmts.h>
62#include <linux/sched/sysctl.h>
63#include <linux/mount.h>
64#include <linux/userfaultfd_k.h>
65#include <linux/pid.h>
66
67#include "../lib/kstrtox.h"
68
69#include <linux/uaccess.h>
70#include <asm/processor.h>
71
72#ifdef CONFIG_X86
73#include <asm/nmi.h>
74#include <asm/stacktrace.h>
75#include <asm/io.h>
76#endif
77#ifdef CONFIG_SPARC
78#include <asm/setup.h>
79#endif
80#ifdef CONFIG_RT_MUTEXES
81#include <linux/rtmutex.h>
82#endif
83
84/* shared constants to be used in various sysctls */
85const int sysctl_vals[] = { 0, 1, 2, 3, 4, 100, 200, 1000, 3000, INT_MAX, 65535, -1 };
86EXPORT_SYMBOL(sysctl_vals);
87
88const unsigned long sysctl_long_vals[] = { 0, 1, LONG_MAX };
89EXPORT_SYMBOL_GPL(sysctl_long_vals);
90
91#if defined(CONFIG_SYSCTL)
92
93/* Constants used for minimum and maximum */
94
95#ifdef CONFIG_PERF_EVENTS
96static const int six_hundred_forty_kb = 640 * 1024;
97#endif
98
99
100static const int ngroups_max = NGROUPS_MAX;
101static const int cap_last_cap = CAP_LAST_CAP;
102
103#ifdef CONFIG_PROC_SYSCTL
104
105/**
106 * enum sysctl_writes_mode - supported sysctl write modes
107 *
108 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
109 * to be written, and multiple writes on the same sysctl file descriptor
110 * will rewrite the sysctl value, regardless of file position. No warning
111 * is issued when the initial position is not 0.
112 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
113 * not 0.
114 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
115 * file position 0 and the value must be fully contained in the buffer
116 * sent to the write syscall. If dealing with strings respect the file
117 * position, but restrict this to the max length of the buffer, anything
118 * passed the max length will be ignored. Multiple writes will append
119 * to the buffer.
120 *
121 * These write modes control how current file position affects the behavior of
122 * updating sysctl values through the proc interface on each write.
123 */
124enum sysctl_writes_mode {
125 SYSCTL_WRITES_LEGACY = -1,
126 SYSCTL_WRITES_WARN = 0,
127 SYSCTL_WRITES_STRICT = 1,
128};
129
130static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
131#endif /* CONFIG_PROC_SYSCTL */
132
133#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
134 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
135int sysctl_legacy_va_layout;
136#endif
137
138#endif /* CONFIG_SYSCTL */
139
140/*
141 * /proc/sys support
142 */
143
144#ifdef CONFIG_PROC_SYSCTL
145
146static int _proc_do_string(char *data, int maxlen, int write,
147 char *buffer, size_t *lenp, loff_t *ppos)
148{
149 size_t len;
150 char c, *p;
151
152 if (!data || !maxlen || !*lenp) {
153 *lenp = 0;
154 return 0;
155 }
156
157 if (write) {
158 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
159 /* Only continue writes not past the end of buffer. */
160 len = strlen(data);
161 if (len > maxlen - 1)
162 len = maxlen - 1;
163
164 if (*ppos > len)
165 return 0;
166 len = *ppos;
167 } else {
168 /* Start writing from beginning of buffer. */
169 len = 0;
170 }
171
172 *ppos += *lenp;
173 p = buffer;
174 while ((p - buffer) < *lenp && len < maxlen - 1) {
175 c = *(p++);
176 if (c == 0 || c == '\n')
177 break;
178 data[len++] = c;
179 }
180 data[len] = 0;
181 } else {
182 len = strlen(data);
183 if (len > maxlen)
184 len = maxlen;
185
186 if (*ppos > len) {
187 *lenp = 0;
188 return 0;
189 }
190
191 data += *ppos;
192 len -= *ppos;
193
194 if (len > *lenp)
195 len = *lenp;
196 if (len)
197 memcpy(buffer, data, len);
198 if (len < *lenp) {
199 buffer[len] = '\n';
200 len++;
201 }
202 *lenp = len;
203 *ppos += len;
204 }
205 return 0;
206}
207
208static void warn_sysctl_write(struct ctl_table *table)
209{
210 pr_warn_once("%s wrote to %s when file position was not 0!\n"
211 "This will not be supported in the future. To silence this\n"
212 "warning, set kernel.sysctl_writes_strict = -1\n",
213 current->comm, table->procname);
214}
215
216/**
217 * proc_first_pos_non_zero_ignore - check if first position is allowed
218 * @ppos: file position
219 * @table: the sysctl table
220 *
221 * Returns true if the first position is non-zero and the sysctl_writes_strict
222 * mode indicates this is not allowed for numeric input types. String proc
223 * handlers can ignore the return value.
224 */
225static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
226 struct ctl_table *table)
227{
228 if (!*ppos)
229 return false;
230
231 switch (sysctl_writes_strict) {
232 case SYSCTL_WRITES_STRICT:
233 return true;
234 case SYSCTL_WRITES_WARN:
235 warn_sysctl_write(table);
236 return false;
237 default:
238 return false;
239 }
240}
241
242/**
243 * proc_dostring - read a string sysctl
244 * @table: the sysctl table
245 * @write: %TRUE if this is a write to the sysctl file
246 * @buffer: the user buffer
247 * @lenp: the size of the user buffer
248 * @ppos: file position
249 *
250 * Reads/writes a string from/to the user buffer. If the kernel
251 * buffer provided is not large enough to hold the string, the
252 * string is truncated. The copied string is %NULL-terminated.
253 * If the string is being read by the user process, it is copied
254 * and a newline '\n' is added. It is truncated if the buffer is
255 * not large enough.
256 *
257 * Returns 0 on success.
258 */
259int proc_dostring(struct ctl_table *table, int write,
260 void *buffer, size_t *lenp, loff_t *ppos)
261{
262 if (write)
263 proc_first_pos_non_zero_ignore(ppos, table);
264
265 return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
266 ppos);
267}
268
269static void proc_skip_spaces(char **buf, size_t *size)
270{
271 while (*size) {
272 if (!isspace(**buf))
273 break;
274 (*size)--;
275 (*buf)++;
276 }
277}
278
279static void proc_skip_char(char **buf, size_t *size, const char v)
280{
281 while (*size) {
282 if (**buf != v)
283 break;
284 (*size)--;
285 (*buf)++;
286 }
287}
288
289/**
290 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
291 * fail on overflow
292 *
293 * @cp: kernel buffer containing the string to parse
294 * @endp: pointer to store the trailing characters
295 * @base: the base to use
296 * @res: where the parsed integer will be stored
297 *
298 * In case of success 0 is returned and @res will contain the parsed integer,
299 * @endp will hold any trailing characters.
300 * This function will fail the parse on overflow. If there wasn't an overflow
301 * the function will defer the decision what characters count as invalid to the
302 * caller.
303 */
304static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
305 unsigned long *res)
306{
307 unsigned long long result;
308 unsigned int rv;
309
310 cp = _parse_integer_fixup_radix(cp, &base);
311 rv = _parse_integer(cp, base, &result);
312 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
313 return -ERANGE;
314
315 cp += rv;
316
317 if (endp)
318 *endp = (char *)cp;
319
320 *res = (unsigned long)result;
321 return 0;
322}
323
324#define TMPBUFLEN 22
325/**
326 * proc_get_long - reads an ASCII formatted integer from a user buffer
327 *
328 * @buf: a kernel buffer
329 * @size: size of the kernel buffer
330 * @val: this is where the number will be stored
331 * @neg: set to %TRUE if number is negative
332 * @perm_tr: a vector which contains the allowed trailers
333 * @perm_tr_len: size of the perm_tr vector
334 * @tr: pointer to store the trailer character
335 *
336 * In case of success %0 is returned and @buf and @size are updated with
337 * the amount of bytes read. If @tr is non-NULL and a trailing
338 * character exists (size is non-zero after returning from this
339 * function), @tr is updated with the trailing character.
340 */
341static int proc_get_long(char **buf, size_t *size,
342 unsigned long *val, bool *neg,
343 const char *perm_tr, unsigned perm_tr_len, char *tr)
344{
345 char *p, tmp[TMPBUFLEN];
346 ssize_t len = *size;
347
348 if (len <= 0)
349 return -EINVAL;
350
351 if (len > TMPBUFLEN - 1)
352 len = TMPBUFLEN - 1;
353
354 memcpy(tmp, *buf, len);
355
356 tmp[len] = 0;
357 p = tmp;
358 if (*p == '-' && *size > 1) {
359 *neg = true;
360 p++;
361 } else
362 *neg = false;
363 if (!isdigit(*p))
364 return -EINVAL;
365
366 if (strtoul_lenient(p, &p, 0, val))
367 return -EINVAL;
368
369 len = p - tmp;
370
371 /* We don't know if the next char is whitespace thus we may accept
372 * invalid integers (e.g. 1234...a) or two integers instead of one
373 * (e.g. 123...1). So lets not allow such large numbers. */
374 if (len == TMPBUFLEN - 1)
375 return -EINVAL;
376
377 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
378 return -EINVAL;
379
380 if (tr && (len < *size))
381 *tr = *p;
382
383 *buf += len;
384 *size -= len;
385
386 return 0;
387}
388
389/**
390 * proc_put_long - converts an integer to a decimal ASCII formatted string
391 *
392 * @buf: the user buffer
393 * @size: the size of the user buffer
394 * @val: the integer to be converted
395 * @neg: sign of the number, %TRUE for negative
396 *
397 * In case of success @buf and @size are updated with the amount of bytes
398 * written.
399 */
400static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
401{
402 int len;
403 char tmp[TMPBUFLEN], *p = tmp;
404
405 sprintf(p, "%s%lu", neg ? "-" : "", val);
406 len = strlen(tmp);
407 if (len > *size)
408 len = *size;
409 memcpy(*buf, tmp, len);
410 *size -= len;
411 *buf += len;
412}
413#undef TMPBUFLEN
414
415static void proc_put_char(void **buf, size_t *size, char c)
416{
417 if (*size) {
418 char **buffer = (char **)buf;
419 **buffer = c;
420
421 (*size)--;
422 (*buffer)++;
423 *buf = *buffer;
424 }
425}
426
427static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
428 int *valp,
429 int write, void *data)
430{
431 if (write) {
432 if (*negp) {
433 if (*lvalp > (unsigned long) INT_MAX + 1)
434 return -EINVAL;
435 WRITE_ONCE(*valp, -*lvalp);
436 } else {
437 if (*lvalp > (unsigned long) INT_MAX)
438 return -EINVAL;
439 WRITE_ONCE(*valp, *lvalp);
440 }
441 } else {
442 int val = READ_ONCE(*valp);
443 if (val < 0) {
444 *negp = true;
445 *lvalp = -(unsigned long)val;
446 } else {
447 *negp = false;
448 *lvalp = (unsigned long)val;
449 }
450 }
451 return 0;
452}
453
454static int do_proc_douintvec_conv(unsigned long *lvalp,
455 unsigned int *valp,
456 int write, void *data)
457{
458 if (write) {
459 if (*lvalp > UINT_MAX)
460 return -EINVAL;
461 WRITE_ONCE(*valp, *lvalp);
462 } else {
463 unsigned int val = READ_ONCE(*valp);
464 *lvalp = (unsigned long)val;
465 }
466 return 0;
467}
468
469static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
470
471static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
472 int write, void *buffer,
473 size_t *lenp, loff_t *ppos,
474 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
475 int write, void *data),
476 void *data)
477{
478 int *i, vleft, first = 1, err = 0;
479 size_t left;
480 char *p;
481
482 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
483 *lenp = 0;
484 return 0;
485 }
486
487 i = (int *) tbl_data;
488 vleft = table->maxlen / sizeof(*i);
489 left = *lenp;
490
491 if (!conv)
492 conv = do_proc_dointvec_conv;
493
494 if (write) {
495 if (proc_first_pos_non_zero_ignore(ppos, table))
496 goto out;
497
498 if (left > PAGE_SIZE - 1)
499 left = PAGE_SIZE - 1;
500 p = buffer;
501 }
502
503 for (; left && vleft--; i++, first=0) {
504 unsigned long lval;
505 bool neg;
506
507 if (write) {
508 proc_skip_spaces(&p, &left);
509
510 if (!left)
511 break;
512 err = proc_get_long(&p, &left, &lval, &neg,
513 proc_wspace_sep,
514 sizeof(proc_wspace_sep), NULL);
515 if (err)
516 break;
517 if (conv(&neg, &lval, i, 1, data)) {
518 err = -EINVAL;
519 break;
520 }
521 } else {
522 if (conv(&neg, &lval, i, 0, data)) {
523 err = -EINVAL;
524 break;
525 }
526 if (!first)
527 proc_put_char(&buffer, &left, '\t');
528 proc_put_long(&buffer, &left, lval, neg);
529 }
530 }
531
532 if (!write && !first && left && !err)
533 proc_put_char(&buffer, &left, '\n');
534 if (write && !err && left)
535 proc_skip_spaces(&p, &left);
536 if (write && first)
537 return err ? : -EINVAL;
538 *lenp -= left;
539out:
540 *ppos += *lenp;
541 return err;
542}
543
544static int do_proc_dointvec(struct ctl_table *table, int write,
545 void *buffer, size_t *lenp, loff_t *ppos,
546 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
547 int write, void *data),
548 void *data)
549{
550 return __do_proc_dointvec(table->data, table, write,
551 buffer, lenp, ppos, conv, data);
552}
553
554static int do_proc_douintvec_w(unsigned int *tbl_data,
555 struct ctl_table *table,
556 void *buffer,
557 size_t *lenp, loff_t *ppos,
558 int (*conv)(unsigned long *lvalp,
559 unsigned int *valp,
560 int write, void *data),
561 void *data)
562{
563 unsigned long lval;
564 int err = 0;
565 size_t left;
566 bool neg;
567 char *p = buffer;
568
569 left = *lenp;
570
571 if (proc_first_pos_non_zero_ignore(ppos, table))
572 goto bail_early;
573
574 if (left > PAGE_SIZE - 1)
575 left = PAGE_SIZE - 1;
576
577 proc_skip_spaces(&p, &left);
578 if (!left) {
579 err = -EINVAL;
580 goto out_free;
581 }
582
583 err = proc_get_long(&p, &left, &lval, &neg,
584 proc_wspace_sep,
585 sizeof(proc_wspace_sep), NULL);
586 if (err || neg) {
587 err = -EINVAL;
588 goto out_free;
589 }
590
591 if (conv(&lval, tbl_data, 1, data)) {
592 err = -EINVAL;
593 goto out_free;
594 }
595
596 if (!err && left)
597 proc_skip_spaces(&p, &left);
598
599out_free:
600 if (err)
601 return -EINVAL;
602
603 return 0;
604
605 /* This is in keeping with old __do_proc_dointvec() */
606bail_early:
607 *ppos += *lenp;
608 return err;
609}
610
611static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
612 size_t *lenp, loff_t *ppos,
613 int (*conv)(unsigned long *lvalp,
614 unsigned int *valp,
615 int write, void *data),
616 void *data)
617{
618 unsigned long lval;
619 int err = 0;
620 size_t left;
621
622 left = *lenp;
623
624 if (conv(&lval, tbl_data, 0, data)) {
625 err = -EINVAL;
626 goto out;
627 }
628
629 proc_put_long(&buffer, &left, lval, false);
630 if (!left)
631 goto out;
632
633 proc_put_char(&buffer, &left, '\n');
634
635out:
636 *lenp -= left;
637 *ppos += *lenp;
638
639 return err;
640}
641
642static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
643 int write, void *buffer,
644 size_t *lenp, loff_t *ppos,
645 int (*conv)(unsigned long *lvalp,
646 unsigned int *valp,
647 int write, void *data),
648 void *data)
649{
650 unsigned int *i, vleft;
651
652 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
653 *lenp = 0;
654 return 0;
655 }
656
657 i = (unsigned int *) tbl_data;
658 vleft = table->maxlen / sizeof(*i);
659
660 /*
661 * Arrays are not supported, keep this simple. *Do not* add
662 * support for them.
663 */
664 if (vleft != 1) {
665 *lenp = 0;
666 return -EINVAL;
667 }
668
669 if (!conv)
670 conv = do_proc_douintvec_conv;
671
672 if (write)
673 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
674 conv, data);
675 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
676}
677
678int do_proc_douintvec(struct ctl_table *table, int write,
679 void *buffer, size_t *lenp, loff_t *ppos,
680 int (*conv)(unsigned long *lvalp,
681 unsigned int *valp,
682 int write, void *data),
683 void *data)
684{
685 return __do_proc_douintvec(table->data, table, write,
686 buffer, lenp, ppos, conv, data);
687}
688
689/**
690 * proc_dobool - read/write a bool
691 * @table: the sysctl table
692 * @write: %TRUE if this is a write to the sysctl file
693 * @buffer: the user buffer
694 * @lenp: the size of the user buffer
695 * @ppos: file position
696 *
697 * Reads/writes one integer value from/to the user buffer,
698 * treated as an ASCII string.
699 *
700 * table->data must point to a bool variable and table->maxlen must
701 * be sizeof(bool).
702 *
703 * Returns 0 on success.
704 */
705int proc_dobool(struct ctl_table *table, int write, void *buffer,
706 size_t *lenp, loff_t *ppos)
707{
708 struct ctl_table tmp;
709 bool *data = table->data;
710 int res, val;
711
712 /* Do not support arrays yet. */
713 if (table->maxlen != sizeof(bool))
714 return -EINVAL;
715
716 tmp = *table;
717 tmp.maxlen = sizeof(val);
718 tmp.data = &val;
719
720 val = READ_ONCE(*data);
721 res = proc_dointvec(&tmp, write, buffer, lenp, ppos);
722 if (res)
723 return res;
724 if (write)
725 WRITE_ONCE(*data, val);
726 return 0;
727}
728
729/**
730 * proc_dointvec - read a vector of integers
731 * @table: the sysctl table
732 * @write: %TRUE if this is a write to the sysctl file
733 * @buffer: the user buffer
734 * @lenp: the size of the user buffer
735 * @ppos: file position
736 *
737 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
738 * values from/to the user buffer, treated as an ASCII string.
739 *
740 * Returns 0 on success.
741 */
742int proc_dointvec(struct ctl_table *table, int write, void *buffer,
743 size_t *lenp, loff_t *ppos)
744{
745 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
746}
747
748/**
749 * proc_douintvec - read a vector of unsigned integers
750 * @table: the sysctl table
751 * @write: %TRUE if this is a write to the sysctl file
752 * @buffer: the user buffer
753 * @lenp: the size of the user buffer
754 * @ppos: file position
755 *
756 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
757 * values from/to the user buffer, treated as an ASCII string.
758 *
759 * Returns 0 on success.
760 */
761int proc_douintvec(struct ctl_table *table, int write, void *buffer,
762 size_t *lenp, loff_t *ppos)
763{
764 return do_proc_douintvec(table, write, buffer, lenp, ppos,
765 do_proc_douintvec_conv, NULL);
766}
767
768/*
769 * Taint values can only be increased
770 * This means we can safely use a temporary.
771 */
772static int proc_taint(struct ctl_table *table, int write,
773 void *buffer, size_t *lenp, loff_t *ppos)
774{
775 struct ctl_table t;
776 unsigned long tmptaint = get_taint();
777 int err;
778
779 if (write && !capable(CAP_SYS_ADMIN))
780 return -EPERM;
781
782 t = *table;
783 t.data = &tmptaint;
784 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
785 if (err < 0)
786 return err;
787
788 if (write) {
789 int i;
790
791 /*
792 * If we are relying on panic_on_taint not producing
793 * false positives due to userspace input, bail out
794 * before setting the requested taint flags.
795 */
796 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
797 return -EINVAL;
798
799 /*
800 * Poor man's atomic or. Not worth adding a primitive
801 * to everyone's atomic.h for this
802 */
803 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
804 if ((1UL << i) & tmptaint)
805 add_taint(i, LOCKDEP_STILL_OK);
806 }
807
808 return err;
809}
810
811/**
812 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
813 * @min: pointer to minimum allowable value
814 * @max: pointer to maximum allowable value
815 *
816 * The do_proc_dointvec_minmax_conv_param structure provides the
817 * minimum and maximum values for doing range checking for those sysctl
818 * parameters that use the proc_dointvec_minmax() handler.
819 */
820struct do_proc_dointvec_minmax_conv_param {
821 int *min;
822 int *max;
823};
824
825static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
826 int *valp,
827 int write, void *data)
828{
829 int tmp, ret;
830 struct do_proc_dointvec_minmax_conv_param *param = data;
831 /*
832 * If writing, first do so via a temporary local int so we can
833 * bounds-check it before touching *valp.
834 */
835 int *ip = write ? &tmp : valp;
836
837 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
838 if (ret)
839 return ret;
840
841 if (write) {
842 if ((param->min && *param->min > tmp) ||
843 (param->max && *param->max < tmp))
844 return -EINVAL;
845 WRITE_ONCE(*valp, tmp);
846 }
847
848 return 0;
849}
850
851/**
852 * proc_dointvec_minmax - read a vector of integers with min/max values
853 * @table: the sysctl table
854 * @write: %TRUE if this is a write to the sysctl file
855 * @buffer: the user buffer
856 * @lenp: the size of the user buffer
857 * @ppos: file position
858 *
859 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
860 * values from/to the user buffer, treated as an ASCII string.
861 *
862 * This routine will ensure the values are within the range specified by
863 * table->extra1 (min) and table->extra2 (max).
864 *
865 * Returns 0 on success or -EINVAL on write when the range check fails.
866 */
867int proc_dointvec_minmax(struct ctl_table *table, int write,
868 void *buffer, size_t *lenp, loff_t *ppos)
869{
870 struct do_proc_dointvec_minmax_conv_param param = {
871 .min = (int *) table->extra1,
872 .max = (int *) table->extra2,
873 };
874 return do_proc_dointvec(table, write, buffer, lenp, ppos,
875 do_proc_dointvec_minmax_conv, ¶m);
876}
877
878/**
879 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
880 * @min: pointer to minimum allowable value
881 * @max: pointer to maximum allowable value
882 *
883 * The do_proc_douintvec_minmax_conv_param structure provides the
884 * minimum and maximum values for doing range checking for those sysctl
885 * parameters that use the proc_douintvec_minmax() handler.
886 */
887struct do_proc_douintvec_minmax_conv_param {
888 unsigned int *min;
889 unsigned int *max;
890};
891
892static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
893 unsigned int *valp,
894 int write, void *data)
895{
896 int ret;
897 unsigned int tmp;
898 struct do_proc_douintvec_minmax_conv_param *param = data;
899 /* write via temporary local uint for bounds-checking */
900 unsigned int *up = write ? &tmp : valp;
901
902 ret = do_proc_douintvec_conv(lvalp, up, write, data);
903 if (ret)
904 return ret;
905
906 if (write) {
907 if ((param->min && *param->min > tmp) ||
908 (param->max && *param->max < tmp))
909 return -ERANGE;
910
911 WRITE_ONCE(*valp, tmp);
912 }
913
914 return 0;
915}
916
917/**
918 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
919 * @table: the sysctl table
920 * @write: %TRUE if this is a write to the sysctl file
921 * @buffer: the user buffer
922 * @lenp: the size of the user buffer
923 * @ppos: file position
924 *
925 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
926 * values from/to the user buffer, treated as an ASCII string. Negative
927 * strings are not allowed.
928 *
929 * This routine will ensure the values are within the range specified by
930 * table->extra1 (min) and table->extra2 (max). There is a final sanity
931 * check for UINT_MAX to avoid having to support wrap around uses from
932 * userspace.
933 *
934 * Returns 0 on success or -ERANGE on write when the range check fails.
935 */
936int proc_douintvec_minmax(struct ctl_table *table, int write,
937 void *buffer, size_t *lenp, loff_t *ppos)
938{
939 struct do_proc_douintvec_minmax_conv_param param = {
940 .min = (unsigned int *) table->extra1,
941 .max = (unsigned int *) table->extra2,
942 };
943 return do_proc_douintvec(table, write, buffer, lenp, ppos,
944 do_proc_douintvec_minmax_conv, ¶m);
945}
946
947/**
948 * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
949 * @table: the sysctl table
950 * @write: %TRUE if this is a write to the sysctl file
951 * @buffer: the user buffer
952 * @lenp: the size of the user buffer
953 * @ppos: file position
954 *
955 * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
956 * values from/to the user buffer, treated as an ASCII string. Negative
957 * strings are not allowed.
958 *
959 * This routine will ensure the values are within the range specified by
960 * table->extra1 (min) and table->extra2 (max).
961 *
962 * Returns 0 on success or an error on write when the range check fails.
963 */
964int proc_dou8vec_minmax(struct ctl_table *table, int write,
965 void *buffer, size_t *lenp, loff_t *ppos)
966{
967 struct ctl_table tmp;
968 unsigned int min = 0, max = 255U, val;
969 u8 *data = table->data;
970 struct do_proc_douintvec_minmax_conv_param param = {
971 .min = &min,
972 .max = &max,
973 };
974 int res;
975
976 /* Do not support arrays yet. */
977 if (table->maxlen != sizeof(u8))
978 return -EINVAL;
979
980 if (table->extra1) {
981 min = *(unsigned int *) table->extra1;
982 if (min > 255U)
983 return -EINVAL;
984 }
985 if (table->extra2) {
986 max = *(unsigned int *) table->extra2;
987 if (max > 255U)
988 return -EINVAL;
989 }
990
991 tmp = *table;
992
993 tmp.maxlen = sizeof(val);
994 tmp.data = &val;
995 val = READ_ONCE(*data);
996 res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
997 do_proc_douintvec_minmax_conv, ¶m);
998 if (res)
999 return res;
1000 if (write)
1001 WRITE_ONCE(*data, val);
1002 return 0;
1003}
1004EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
1005
1006#ifdef CONFIG_MAGIC_SYSRQ
1007static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1008 void *buffer, size_t *lenp, loff_t *ppos)
1009{
1010 int tmp, ret;
1011
1012 tmp = sysrq_mask();
1013
1014 ret = __do_proc_dointvec(&tmp, table, write, buffer,
1015 lenp, ppos, NULL, NULL);
1016 if (ret || !write)
1017 return ret;
1018
1019 if (write)
1020 sysrq_toggle_support(tmp);
1021
1022 return 0;
1023}
1024#endif
1025
1026static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1027 int write, void *buffer, size_t *lenp, loff_t *ppos,
1028 unsigned long convmul, unsigned long convdiv)
1029{
1030 unsigned long *i, *min, *max;
1031 int vleft, first = 1, err = 0;
1032 size_t left;
1033 char *p;
1034
1035 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1036 *lenp = 0;
1037 return 0;
1038 }
1039
1040 i = data;
1041 min = table->extra1;
1042 max = table->extra2;
1043 vleft = table->maxlen / sizeof(unsigned long);
1044 left = *lenp;
1045
1046 if (write) {
1047 if (proc_first_pos_non_zero_ignore(ppos, table))
1048 goto out;
1049
1050 if (left > PAGE_SIZE - 1)
1051 left = PAGE_SIZE - 1;
1052 p = buffer;
1053 }
1054
1055 for (; left && vleft--; i++, first = 0) {
1056 unsigned long val;
1057
1058 if (write) {
1059 bool neg;
1060
1061 proc_skip_spaces(&p, &left);
1062 if (!left)
1063 break;
1064
1065 err = proc_get_long(&p, &left, &val, &neg,
1066 proc_wspace_sep,
1067 sizeof(proc_wspace_sep), NULL);
1068 if (err || neg) {
1069 err = -EINVAL;
1070 break;
1071 }
1072
1073 val = convmul * val / convdiv;
1074 if ((min && val < *min) || (max && val > *max)) {
1075 err = -EINVAL;
1076 break;
1077 }
1078 WRITE_ONCE(*i, val);
1079 } else {
1080 val = convdiv * READ_ONCE(*i) / convmul;
1081 if (!first)
1082 proc_put_char(&buffer, &left, '\t');
1083 proc_put_long(&buffer, &left, val, false);
1084 }
1085 }
1086
1087 if (!write && !first && left && !err)
1088 proc_put_char(&buffer, &left, '\n');
1089 if (write && !err)
1090 proc_skip_spaces(&p, &left);
1091 if (write && first)
1092 return err ? : -EINVAL;
1093 *lenp -= left;
1094out:
1095 *ppos += *lenp;
1096 return err;
1097}
1098
1099static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1100 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1101 unsigned long convdiv)
1102{
1103 return __do_proc_doulongvec_minmax(table->data, table, write,
1104 buffer, lenp, ppos, convmul, convdiv);
1105}
1106
1107/**
1108 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1109 * @table: the sysctl table
1110 * @write: %TRUE if this is a write to the sysctl file
1111 * @buffer: the user buffer
1112 * @lenp: the size of the user buffer
1113 * @ppos: file position
1114 *
1115 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1116 * values from/to the user buffer, treated as an ASCII string.
1117 *
1118 * This routine will ensure the values are within the range specified by
1119 * table->extra1 (min) and table->extra2 (max).
1120 *
1121 * Returns 0 on success.
1122 */
1123int proc_doulongvec_minmax(struct ctl_table *table, int write,
1124 void *buffer, size_t *lenp, loff_t *ppos)
1125{
1126 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1127}
1128
1129/**
1130 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1131 * @table: the sysctl table
1132 * @write: %TRUE if this is a write to the sysctl file
1133 * @buffer: the user buffer
1134 * @lenp: the size of the user buffer
1135 * @ppos: file position
1136 *
1137 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1138 * values from/to the user buffer, treated as an ASCII string. The values
1139 * are treated as milliseconds, and converted to jiffies when they are stored.
1140 *
1141 * This routine will ensure the values are within the range specified by
1142 * table->extra1 (min) and table->extra2 (max).
1143 *
1144 * Returns 0 on success.
1145 */
1146int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1147 void *buffer, size_t *lenp, loff_t *ppos)
1148{
1149 return do_proc_doulongvec_minmax(table, write, buffer,
1150 lenp, ppos, HZ, 1000l);
1151}
1152
1153
1154static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1155 int *valp,
1156 int write, void *data)
1157{
1158 if (write) {
1159 if (*lvalp > INT_MAX / HZ)
1160 return 1;
1161 if (*negp)
1162 WRITE_ONCE(*valp, -*lvalp * HZ);
1163 else
1164 WRITE_ONCE(*valp, *lvalp * HZ);
1165 } else {
1166 int val = READ_ONCE(*valp);
1167 unsigned long lval;
1168 if (val < 0) {
1169 *negp = true;
1170 lval = -(unsigned long)val;
1171 } else {
1172 *negp = false;
1173 lval = (unsigned long)val;
1174 }
1175 *lvalp = lval / HZ;
1176 }
1177 return 0;
1178}
1179
1180static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1181 int *valp,
1182 int write, void *data)
1183{
1184 if (write) {
1185 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1186 return 1;
1187 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1188 } else {
1189 int val = *valp;
1190 unsigned long lval;
1191 if (val < 0) {
1192 *negp = true;
1193 lval = -(unsigned long)val;
1194 } else {
1195 *negp = false;
1196 lval = (unsigned long)val;
1197 }
1198 *lvalp = jiffies_to_clock_t(lval);
1199 }
1200 return 0;
1201}
1202
1203static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1204 int *valp,
1205 int write, void *data)
1206{
1207 if (write) {
1208 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1209
1210 if (jif > INT_MAX)
1211 return 1;
1212 WRITE_ONCE(*valp, (int)jif);
1213 } else {
1214 int val = READ_ONCE(*valp);
1215 unsigned long lval;
1216 if (val < 0) {
1217 *negp = true;
1218 lval = -(unsigned long)val;
1219 } else {
1220 *negp = false;
1221 lval = (unsigned long)val;
1222 }
1223 *lvalp = jiffies_to_msecs(lval);
1224 }
1225 return 0;
1226}
1227
1228static int do_proc_dointvec_ms_jiffies_minmax_conv(bool *negp, unsigned long *lvalp,
1229 int *valp, int write, void *data)
1230{
1231 int tmp, ret;
1232 struct do_proc_dointvec_minmax_conv_param *param = data;
1233 /*
1234 * If writing, first do so via a temporary local int so we can
1235 * bounds-check it before touching *valp.
1236 */
1237 int *ip = write ? &tmp : valp;
1238
1239 ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);
1240 if (ret)
1241 return ret;
1242
1243 if (write) {
1244 if ((param->min && *param->min > tmp) ||
1245 (param->max && *param->max < tmp))
1246 return -EINVAL;
1247 *valp = tmp;
1248 }
1249 return 0;
1250}
1251
1252/**
1253 * proc_dointvec_jiffies - read a vector of integers as seconds
1254 * @table: the sysctl table
1255 * @write: %TRUE if this is a write to the sysctl file
1256 * @buffer: the user buffer
1257 * @lenp: the size of the user buffer
1258 * @ppos: file position
1259 *
1260 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1261 * values from/to the user buffer, treated as an ASCII string.
1262 * The values read are assumed to be in seconds, and are converted into
1263 * jiffies.
1264 *
1265 * Returns 0 on success.
1266 */
1267int proc_dointvec_jiffies(struct ctl_table *table, int write,
1268 void *buffer, size_t *lenp, loff_t *ppos)
1269{
1270 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1271 do_proc_dointvec_jiffies_conv,NULL);
1272}
1273
1274int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1275 void *buffer, size_t *lenp, loff_t *ppos)
1276{
1277 struct do_proc_dointvec_minmax_conv_param param = {
1278 .min = (int *) table->extra1,
1279 .max = (int *) table->extra2,
1280 };
1281 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1282 do_proc_dointvec_ms_jiffies_minmax_conv, ¶m);
1283}
1284
1285/**
1286 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1287 * @table: the sysctl table
1288 * @write: %TRUE if this is a write to the sysctl file
1289 * @buffer: the user buffer
1290 * @lenp: the size of the user buffer
1291 * @ppos: pointer to the file position
1292 *
1293 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1294 * values from/to the user buffer, treated as an ASCII string.
1295 * The values read are assumed to be in 1/USER_HZ seconds, and
1296 * are converted into jiffies.
1297 *
1298 * Returns 0 on success.
1299 */
1300int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1301 void *buffer, size_t *lenp, loff_t *ppos)
1302{
1303 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1304 do_proc_dointvec_userhz_jiffies_conv, NULL);
1305}
1306
1307/**
1308 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1309 * @table: the sysctl table
1310 * @write: %TRUE if this is a write to the sysctl file
1311 * @buffer: the user buffer
1312 * @lenp: the size of the user buffer
1313 * @ppos: file position
1314 * @ppos: the current position in the file
1315 *
1316 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1317 * values from/to the user buffer, treated as an ASCII string.
1318 * The values read are assumed to be in 1/1000 seconds, and
1319 * are converted into jiffies.
1320 *
1321 * Returns 0 on success.
1322 */
1323int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1324 size_t *lenp, loff_t *ppos)
1325{
1326 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1327 do_proc_dointvec_ms_jiffies_conv, NULL);
1328}
1329
1330static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1331 size_t *lenp, loff_t *ppos)
1332{
1333 struct pid *new_pid;
1334 pid_t tmp;
1335 int r;
1336
1337 tmp = pid_vnr(cad_pid);
1338
1339 r = __do_proc_dointvec(&tmp, table, write, buffer,
1340 lenp, ppos, NULL, NULL);
1341 if (r || !write)
1342 return r;
1343
1344 new_pid = find_get_pid(tmp);
1345 if (!new_pid)
1346 return -ESRCH;
1347
1348 put_pid(xchg(&cad_pid, new_pid));
1349 return 0;
1350}
1351
1352/**
1353 * proc_do_large_bitmap - read/write from/to a large bitmap
1354 * @table: the sysctl table
1355 * @write: %TRUE if this is a write to the sysctl file
1356 * @buffer: the user buffer
1357 * @lenp: the size of the user buffer
1358 * @ppos: file position
1359 *
1360 * The bitmap is stored at table->data and the bitmap length (in bits)
1361 * in table->maxlen.
1362 *
1363 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1364 * large bitmaps may be represented in a compact manner. Writing into
1365 * the file will clear the bitmap then update it with the given input.
1366 *
1367 * Returns 0 on success.
1368 */
1369int proc_do_large_bitmap(struct ctl_table *table, int write,
1370 void *buffer, size_t *lenp, loff_t *ppos)
1371{
1372 int err = 0;
1373 size_t left = *lenp;
1374 unsigned long bitmap_len = table->maxlen;
1375 unsigned long *bitmap = *(unsigned long **) table->data;
1376 unsigned long *tmp_bitmap = NULL;
1377 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1378
1379 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1380 *lenp = 0;
1381 return 0;
1382 }
1383
1384 if (write) {
1385 char *p = buffer;
1386 size_t skipped = 0;
1387
1388 if (left > PAGE_SIZE - 1) {
1389 left = PAGE_SIZE - 1;
1390 /* How much of the buffer we'll skip this pass */
1391 skipped = *lenp - left;
1392 }
1393
1394 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1395 if (!tmp_bitmap)
1396 return -ENOMEM;
1397 proc_skip_char(&p, &left, '\n');
1398 while (!err && left) {
1399 unsigned long val_a, val_b;
1400 bool neg;
1401 size_t saved_left;
1402
1403 /* In case we stop parsing mid-number, we can reset */
1404 saved_left = left;
1405 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1406 sizeof(tr_a), &c);
1407 /*
1408 * If we consumed the entirety of a truncated buffer or
1409 * only one char is left (may be a "-"), then stop here,
1410 * reset, & come back for more.
1411 */
1412 if ((left <= 1) && skipped) {
1413 left = saved_left;
1414 break;
1415 }
1416
1417 if (err)
1418 break;
1419 if (val_a >= bitmap_len || neg) {
1420 err = -EINVAL;
1421 break;
1422 }
1423
1424 val_b = val_a;
1425 if (left) {
1426 p++;
1427 left--;
1428 }
1429
1430 if (c == '-') {
1431 err = proc_get_long(&p, &left, &val_b,
1432 &neg, tr_b, sizeof(tr_b),
1433 &c);
1434 /*
1435 * If we consumed all of a truncated buffer or
1436 * then stop here, reset, & come back for more.
1437 */
1438 if (!left && skipped) {
1439 left = saved_left;
1440 break;
1441 }
1442
1443 if (err)
1444 break;
1445 if (val_b >= bitmap_len || neg ||
1446 val_a > val_b) {
1447 err = -EINVAL;
1448 break;
1449 }
1450 if (left) {
1451 p++;
1452 left--;
1453 }
1454 }
1455
1456 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1457 proc_skip_char(&p, &left, '\n');
1458 }
1459 left += skipped;
1460 } else {
1461 unsigned long bit_a, bit_b = 0;
1462 bool first = 1;
1463
1464 while (left) {
1465 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1466 if (bit_a >= bitmap_len)
1467 break;
1468 bit_b = find_next_zero_bit(bitmap, bitmap_len,
1469 bit_a + 1) - 1;
1470
1471 if (!first)
1472 proc_put_char(&buffer, &left, ',');
1473 proc_put_long(&buffer, &left, bit_a, false);
1474 if (bit_a != bit_b) {
1475 proc_put_char(&buffer, &left, '-');
1476 proc_put_long(&buffer, &left, bit_b, false);
1477 }
1478
1479 first = 0; bit_b++;
1480 }
1481 proc_put_char(&buffer, &left, '\n');
1482 }
1483
1484 if (!err) {
1485 if (write) {
1486 if (*ppos)
1487 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1488 else
1489 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1490 }
1491 *lenp -= left;
1492 *ppos += *lenp;
1493 }
1494
1495 bitmap_free(tmp_bitmap);
1496 return err;
1497}
1498
1499#else /* CONFIG_PROC_SYSCTL */
1500
1501int proc_dostring(struct ctl_table *table, int write,
1502 void *buffer, size_t *lenp, loff_t *ppos)
1503{
1504 return -ENOSYS;
1505}
1506
1507int proc_dobool(struct ctl_table *table, int write,
1508 void *buffer, size_t *lenp, loff_t *ppos)
1509{
1510 return -ENOSYS;
1511}
1512
1513int proc_dointvec(struct ctl_table *table, int write,
1514 void *buffer, size_t *lenp, loff_t *ppos)
1515{
1516 return -ENOSYS;
1517}
1518
1519int proc_douintvec(struct ctl_table *table, int write,
1520 void *buffer, size_t *lenp, loff_t *ppos)
1521{
1522 return -ENOSYS;
1523}
1524
1525int proc_dointvec_minmax(struct ctl_table *table, int write,
1526 void *buffer, size_t *lenp, loff_t *ppos)
1527{
1528 return -ENOSYS;
1529}
1530
1531int proc_douintvec_minmax(struct ctl_table *table, int write,
1532 void *buffer, size_t *lenp, loff_t *ppos)
1533{
1534 return -ENOSYS;
1535}
1536
1537int proc_dou8vec_minmax(struct ctl_table *table, int write,
1538 void *buffer, size_t *lenp, loff_t *ppos)
1539{
1540 return -ENOSYS;
1541}
1542
1543int proc_dointvec_jiffies(struct ctl_table *table, int write,
1544 void *buffer, size_t *lenp, loff_t *ppos)
1545{
1546 return -ENOSYS;
1547}
1548
1549int proc_dointvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1550 void *buffer, size_t *lenp, loff_t *ppos)
1551{
1552 return -ENOSYS;
1553}
1554
1555int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1556 void *buffer, size_t *lenp, loff_t *ppos)
1557{
1558 return -ENOSYS;
1559}
1560
1561int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1562 void *buffer, size_t *lenp, loff_t *ppos)
1563{
1564 return -ENOSYS;
1565}
1566
1567int proc_doulongvec_minmax(struct ctl_table *table, int write,
1568 void *buffer, size_t *lenp, loff_t *ppos)
1569{
1570 return -ENOSYS;
1571}
1572
1573int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1574 void *buffer, size_t *lenp, loff_t *ppos)
1575{
1576 return -ENOSYS;
1577}
1578
1579int proc_do_large_bitmap(struct ctl_table *table, int write,
1580 void *buffer, size_t *lenp, loff_t *ppos)
1581{
1582 return -ENOSYS;
1583}
1584
1585#endif /* CONFIG_PROC_SYSCTL */
1586
1587#if defined(CONFIG_SYSCTL)
1588int proc_do_static_key(struct ctl_table *table, int write,
1589 void *buffer, size_t *lenp, loff_t *ppos)
1590{
1591 struct static_key *key = (struct static_key *)table->data;
1592 static DEFINE_MUTEX(static_key_mutex);
1593 int val, ret;
1594 struct ctl_table tmp = {
1595 .data = &val,
1596 .maxlen = sizeof(val),
1597 .mode = table->mode,
1598 .extra1 = SYSCTL_ZERO,
1599 .extra2 = SYSCTL_ONE,
1600 };
1601
1602 if (write && !capable(CAP_SYS_ADMIN))
1603 return -EPERM;
1604
1605 mutex_lock(&static_key_mutex);
1606 val = static_key_enabled(key);
1607 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1608 if (write && !ret) {
1609 if (val)
1610 static_key_enable(key);
1611 else
1612 static_key_disable(key);
1613 }
1614 mutex_unlock(&static_key_mutex);
1615 return ret;
1616}
1617
1618static struct ctl_table kern_table[] = {
1619 {
1620 .procname = "panic",
1621 .data = &panic_timeout,
1622 .maxlen = sizeof(int),
1623 .mode = 0644,
1624 .proc_handler = proc_dointvec,
1625 },
1626#ifdef CONFIG_PROC_SYSCTL
1627 {
1628 .procname = "tainted",
1629 .maxlen = sizeof(long),
1630 .mode = 0644,
1631 .proc_handler = proc_taint,
1632 },
1633 {
1634 .procname = "sysctl_writes_strict",
1635 .data = &sysctl_writes_strict,
1636 .maxlen = sizeof(int),
1637 .mode = 0644,
1638 .proc_handler = proc_dointvec_minmax,
1639 .extra1 = SYSCTL_NEG_ONE,
1640 .extra2 = SYSCTL_ONE,
1641 },
1642#endif
1643 {
1644 .procname = "print-fatal-signals",
1645 .data = &print_fatal_signals,
1646 .maxlen = sizeof(int),
1647 .mode = 0644,
1648 .proc_handler = proc_dointvec,
1649 },
1650#ifdef CONFIG_SPARC
1651 {
1652 .procname = "reboot-cmd",
1653 .data = reboot_command,
1654 .maxlen = 256,
1655 .mode = 0644,
1656 .proc_handler = proc_dostring,
1657 },
1658 {
1659 .procname = "stop-a",
1660 .data = &stop_a_enabled,
1661 .maxlen = sizeof (int),
1662 .mode = 0644,
1663 .proc_handler = proc_dointvec,
1664 },
1665 {
1666 .procname = "scons-poweroff",
1667 .data = &scons_pwroff,
1668 .maxlen = sizeof (int),
1669 .mode = 0644,
1670 .proc_handler = proc_dointvec,
1671 },
1672#endif
1673#ifdef CONFIG_SPARC64
1674 {
1675 .procname = "tsb-ratio",
1676 .data = &sysctl_tsb_ratio,
1677 .maxlen = sizeof (int),
1678 .mode = 0644,
1679 .proc_handler = proc_dointvec,
1680 },
1681#endif
1682#ifdef CONFIG_PARISC
1683 {
1684 .procname = "soft-power",
1685 .data = &pwrsw_enabled,
1686 .maxlen = sizeof (int),
1687 .mode = 0644,
1688 .proc_handler = proc_dointvec,
1689 },
1690#endif
1691#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1692 {
1693 .procname = "unaligned-trap",
1694 .data = &unaligned_enabled,
1695 .maxlen = sizeof (int),
1696 .mode = 0644,
1697 .proc_handler = proc_dointvec,
1698 },
1699#endif
1700#ifdef CONFIG_STACK_TRACER
1701 {
1702 .procname = "stack_tracer_enabled",
1703 .data = &stack_tracer_enabled,
1704 .maxlen = sizeof(int),
1705 .mode = 0644,
1706 .proc_handler = stack_trace_sysctl,
1707 },
1708#endif
1709#ifdef CONFIG_TRACING
1710 {
1711 .procname = "ftrace_dump_on_oops",
1712 .data = &ftrace_dump_on_oops,
1713 .maxlen = MAX_TRACER_SIZE,
1714 .mode = 0644,
1715 .proc_handler = proc_dostring,
1716 },
1717 {
1718 .procname = "traceoff_on_warning",
1719 .data = &__disable_trace_on_warning,
1720 .maxlen = sizeof(__disable_trace_on_warning),
1721 .mode = 0644,
1722 .proc_handler = proc_dointvec,
1723 },
1724 {
1725 .procname = "tracepoint_printk",
1726 .data = &tracepoint_printk,
1727 .maxlen = sizeof(tracepoint_printk),
1728 .mode = 0644,
1729 .proc_handler = tracepoint_printk_sysctl,
1730 },
1731#endif
1732#ifdef CONFIG_MODULES
1733 {
1734 .procname = "modprobe",
1735 .data = &modprobe_path,
1736 .maxlen = KMOD_PATH_LEN,
1737 .mode = 0644,
1738 .proc_handler = proc_dostring,
1739 },
1740 {
1741 .procname = "modules_disabled",
1742 .data = &modules_disabled,
1743 .maxlen = sizeof(int),
1744 .mode = 0644,
1745 /* only handle a transition from default "0" to "1" */
1746 .proc_handler = proc_dointvec_minmax,
1747 .extra1 = SYSCTL_ONE,
1748 .extra2 = SYSCTL_ONE,
1749 },
1750#endif
1751#ifdef CONFIG_UEVENT_HELPER
1752 {
1753 .procname = "hotplug",
1754 .data = &uevent_helper,
1755 .maxlen = UEVENT_HELPER_PATH_LEN,
1756 .mode = 0644,
1757 .proc_handler = proc_dostring,
1758 },
1759#endif
1760#ifdef CONFIG_MAGIC_SYSRQ
1761 {
1762 .procname = "sysrq",
1763 .data = NULL,
1764 .maxlen = sizeof (int),
1765 .mode = 0644,
1766 .proc_handler = sysrq_sysctl_handler,
1767 },
1768#endif
1769#ifdef CONFIG_PROC_SYSCTL
1770 {
1771 .procname = "cad_pid",
1772 .data = NULL,
1773 .maxlen = sizeof (int),
1774 .mode = 0600,
1775 .proc_handler = proc_do_cad_pid,
1776 },
1777#endif
1778 {
1779 .procname = "threads-max",
1780 .data = NULL,
1781 .maxlen = sizeof(int),
1782 .mode = 0644,
1783 .proc_handler = sysctl_max_threads,
1784 },
1785 {
1786 .procname = "overflowuid",
1787 .data = &overflowuid,
1788 .maxlen = sizeof(int),
1789 .mode = 0644,
1790 .proc_handler = proc_dointvec_minmax,
1791 .extra1 = SYSCTL_ZERO,
1792 .extra2 = SYSCTL_MAXOLDUID,
1793 },
1794 {
1795 .procname = "overflowgid",
1796 .data = &overflowgid,
1797 .maxlen = sizeof(int),
1798 .mode = 0644,
1799 .proc_handler = proc_dointvec_minmax,
1800 .extra1 = SYSCTL_ZERO,
1801 .extra2 = SYSCTL_MAXOLDUID,
1802 },
1803#ifdef CONFIG_S390
1804 {
1805 .procname = "userprocess_debug",
1806 .data = &show_unhandled_signals,
1807 .maxlen = sizeof(int),
1808 .mode = 0644,
1809 .proc_handler = proc_dointvec,
1810 },
1811#endif
1812 {
1813 .procname = "pid_max",
1814 .data = &pid_max,
1815 .maxlen = sizeof (int),
1816 .mode = 0644,
1817 .proc_handler = proc_dointvec_minmax,
1818 .extra1 = &pid_max_min,
1819 .extra2 = &pid_max_max,
1820 },
1821 {
1822 .procname = "panic_on_oops",
1823 .data = &panic_on_oops,
1824 .maxlen = sizeof(int),
1825 .mode = 0644,
1826 .proc_handler = proc_dointvec,
1827 },
1828 {
1829 .procname = "panic_print",
1830 .data = &panic_print,
1831 .maxlen = sizeof(unsigned long),
1832 .mode = 0644,
1833 .proc_handler = proc_doulongvec_minmax,
1834 },
1835 {
1836 .procname = "ngroups_max",
1837 .data = (void *)&ngroups_max,
1838 .maxlen = sizeof (int),
1839 .mode = 0444,
1840 .proc_handler = proc_dointvec,
1841 },
1842 {
1843 .procname = "cap_last_cap",
1844 .data = (void *)&cap_last_cap,
1845 .maxlen = sizeof(int),
1846 .mode = 0444,
1847 .proc_handler = proc_dointvec,
1848 },
1849#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1850 {
1851 .procname = "unknown_nmi_panic",
1852 .data = &unknown_nmi_panic,
1853 .maxlen = sizeof (int),
1854 .mode = 0644,
1855 .proc_handler = proc_dointvec,
1856 },
1857#endif
1858
1859#if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
1860 defined(CONFIG_DEBUG_STACKOVERFLOW)
1861 {
1862 .procname = "panic_on_stackoverflow",
1863 .data = &sysctl_panic_on_stackoverflow,
1864 .maxlen = sizeof(int),
1865 .mode = 0644,
1866 .proc_handler = proc_dointvec,
1867 },
1868#endif
1869#if defined(CONFIG_X86)
1870 {
1871 .procname = "panic_on_unrecovered_nmi",
1872 .data = &panic_on_unrecovered_nmi,
1873 .maxlen = sizeof(int),
1874 .mode = 0644,
1875 .proc_handler = proc_dointvec,
1876 },
1877 {
1878 .procname = "panic_on_io_nmi",
1879 .data = &panic_on_io_nmi,
1880 .maxlen = sizeof(int),
1881 .mode = 0644,
1882 .proc_handler = proc_dointvec,
1883 },
1884 {
1885 .procname = "bootloader_type",
1886 .data = &bootloader_type,
1887 .maxlen = sizeof (int),
1888 .mode = 0444,
1889 .proc_handler = proc_dointvec,
1890 },
1891 {
1892 .procname = "bootloader_version",
1893 .data = &bootloader_version,
1894 .maxlen = sizeof (int),
1895 .mode = 0444,
1896 .proc_handler = proc_dointvec,
1897 },
1898 {
1899 .procname = "io_delay_type",
1900 .data = &io_delay_type,
1901 .maxlen = sizeof(int),
1902 .mode = 0644,
1903 .proc_handler = proc_dointvec,
1904 },
1905#endif
1906#if defined(CONFIG_MMU)
1907 {
1908 .procname = "randomize_va_space",
1909 .data = &randomize_va_space,
1910 .maxlen = sizeof(int),
1911 .mode = 0644,
1912 .proc_handler = proc_dointvec,
1913 },
1914#endif
1915#if defined(CONFIG_S390) && defined(CONFIG_SMP)
1916 {
1917 .procname = "spin_retry",
1918 .data = &spin_retry,
1919 .maxlen = sizeof (int),
1920 .mode = 0644,
1921 .proc_handler = proc_dointvec,
1922 },
1923#endif
1924#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1925 {
1926 .procname = "acpi_video_flags",
1927 .data = &acpi_realmode_flags,
1928 .maxlen = sizeof (unsigned long),
1929 .mode = 0644,
1930 .proc_handler = proc_doulongvec_minmax,
1931 },
1932#endif
1933#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1934 {
1935 .procname = "ignore-unaligned-usertrap",
1936 .data = &no_unaligned_warning,
1937 .maxlen = sizeof (int),
1938 .mode = 0644,
1939 .proc_handler = proc_dointvec,
1940 },
1941#endif
1942#ifdef CONFIG_RT_MUTEXES
1943 {
1944 .procname = "max_lock_depth",
1945 .data = &max_lock_depth,
1946 .maxlen = sizeof(int),
1947 .mode = 0644,
1948 .proc_handler = proc_dointvec,
1949 },
1950#endif
1951#ifdef CONFIG_PERF_EVENTS
1952 /*
1953 * User-space scripts rely on the existence of this file
1954 * as a feature check for perf_events being enabled.
1955 *
1956 * So it's an ABI, do not remove!
1957 */
1958 {
1959 .procname = "perf_event_paranoid",
1960 .data = &sysctl_perf_event_paranoid,
1961 .maxlen = sizeof(sysctl_perf_event_paranoid),
1962 .mode = 0644,
1963 .proc_handler = proc_dointvec,
1964 },
1965 {
1966 .procname = "perf_event_mlock_kb",
1967 .data = &sysctl_perf_event_mlock,
1968 .maxlen = sizeof(sysctl_perf_event_mlock),
1969 .mode = 0644,
1970 .proc_handler = proc_dointvec,
1971 },
1972 {
1973 .procname = "perf_event_max_sample_rate",
1974 .data = &sysctl_perf_event_sample_rate,
1975 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1976 .mode = 0644,
1977 .proc_handler = perf_event_max_sample_rate_handler,
1978 .extra1 = SYSCTL_ONE,
1979 },
1980 {
1981 .procname = "perf_cpu_time_max_percent",
1982 .data = &sysctl_perf_cpu_time_max_percent,
1983 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1984 .mode = 0644,
1985 .proc_handler = perf_cpu_time_max_percent_handler,
1986 .extra1 = SYSCTL_ZERO,
1987 .extra2 = SYSCTL_ONE_HUNDRED,
1988 },
1989 {
1990 .procname = "perf_event_max_stack",
1991 .data = &sysctl_perf_event_max_stack,
1992 .maxlen = sizeof(sysctl_perf_event_max_stack),
1993 .mode = 0644,
1994 .proc_handler = perf_event_max_stack_handler,
1995 .extra1 = SYSCTL_ZERO,
1996 .extra2 = (void *)&six_hundred_forty_kb,
1997 },
1998 {
1999 .procname = "perf_event_max_contexts_per_stack",
2000 .data = &sysctl_perf_event_max_contexts_per_stack,
2001 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
2002 .mode = 0644,
2003 .proc_handler = perf_event_max_stack_handler,
2004 .extra1 = SYSCTL_ZERO,
2005 .extra2 = SYSCTL_ONE_THOUSAND,
2006 },
2007#endif
2008 {
2009 .procname = "panic_on_warn",
2010 .data = &panic_on_warn,
2011 .maxlen = sizeof(int),
2012 .mode = 0644,
2013 .proc_handler = proc_dointvec_minmax,
2014 .extra1 = SYSCTL_ZERO,
2015 .extra2 = SYSCTL_ONE,
2016 },
2017#ifdef CONFIG_TREE_RCU
2018 {
2019 .procname = "panic_on_rcu_stall",
2020 .data = &sysctl_panic_on_rcu_stall,
2021 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
2022 .mode = 0644,
2023 .proc_handler = proc_dointvec_minmax,
2024 .extra1 = SYSCTL_ZERO,
2025 .extra2 = SYSCTL_ONE,
2026 },
2027 {
2028 .procname = "max_rcu_stall_to_panic",
2029 .data = &sysctl_max_rcu_stall_to_panic,
2030 .maxlen = sizeof(sysctl_max_rcu_stall_to_panic),
2031 .mode = 0644,
2032 .proc_handler = proc_dointvec_minmax,
2033 .extra1 = SYSCTL_ONE,
2034 .extra2 = SYSCTL_INT_MAX,
2035 },
2036#endif
2037 { }
2038};
2039
2040static struct ctl_table vm_table[] = {
2041 {
2042 .procname = "overcommit_memory",
2043 .data = &sysctl_overcommit_memory,
2044 .maxlen = sizeof(sysctl_overcommit_memory),
2045 .mode = 0644,
2046 .proc_handler = overcommit_policy_handler,
2047 .extra1 = SYSCTL_ZERO,
2048 .extra2 = SYSCTL_TWO,
2049 },
2050 {
2051 .procname = "overcommit_ratio",
2052 .data = &sysctl_overcommit_ratio,
2053 .maxlen = sizeof(sysctl_overcommit_ratio),
2054 .mode = 0644,
2055 .proc_handler = overcommit_ratio_handler,
2056 },
2057 {
2058 .procname = "overcommit_kbytes",
2059 .data = &sysctl_overcommit_kbytes,
2060 .maxlen = sizeof(sysctl_overcommit_kbytes),
2061 .mode = 0644,
2062 .proc_handler = overcommit_kbytes_handler,
2063 },
2064 {
2065 .procname = "page-cluster",
2066 .data = &page_cluster,
2067 .maxlen = sizeof(int),
2068 .mode = 0644,
2069 .proc_handler = proc_dointvec_minmax,
2070 .extra1 = SYSCTL_ZERO,
2071 .extra2 = (void *)&page_cluster_max,
2072 },
2073 {
2074 .procname = "dirtytime_expire_seconds",
2075 .data = &dirtytime_expire_interval,
2076 .maxlen = sizeof(dirtytime_expire_interval),
2077 .mode = 0644,
2078 .proc_handler = dirtytime_interval_handler,
2079 .extra1 = SYSCTL_ZERO,
2080 },
2081 {
2082 .procname = "swappiness",
2083 .data = &vm_swappiness,
2084 .maxlen = sizeof(vm_swappiness),
2085 .mode = 0644,
2086 .proc_handler = proc_dointvec_minmax,
2087 .extra1 = SYSCTL_ZERO,
2088 .extra2 = SYSCTL_TWO_HUNDRED,
2089 },
2090#ifdef CONFIG_NUMA
2091 {
2092 .procname = "numa_stat",
2093 .data = &sysctl_vm_numa_stat,
2094 .maxlen = sizeof(int),
2095 .mode = 0644,
2096 .proc_handler = sysctl_vm_numa_stat_handler,
2097 .extra1 = SYSCTL_ZERO,
2098 .extra2 = SYSCTL_ONE,
2099 },
2100#endif
2101 {
2102 .procname = "drop_caches",
2103 .data = &sysctl_drop_caches,
2104 .maxlen = sizeof(int),
2105 .mode = 0200,
2106 .proc_handler = drop_caches_sysctl_handler,
2107 .extra1 = SYSCTL_ONE,
2108 .extra2 = SYSCTL_FOUR,
2109 },
2110 {
2111 .procname = "page_lock_unfairness",
2112 .data = &sysctl_page_lock_unfairness,
2113 .maxlen = sizeof(sysctl_page_lock_unfairness),
2114 .mode = 0644,
2115 .proc_handler = proc_dointvec_minmax,
2116 .extra1 = SYSCTL_ZERO,
2117 },
2118#ifdef CONFIG_MMU
2119 {
2120 .procname = "max_map_count",
2121 .data = &sysctl_max_map_count,
2122 .maxlen = sizeof(sysctl_max_map_count),
2123 .mode = 0644,
2124 .proc_handler = proc_dointvec_minmax,
2125 .extra1 = SYSCTL_ZERO,
2126 },
2127#else
2128 {
2129 .procname = "nr_trim_pages",
2130 .data = &sysctl_nr_trim_pages,
2131 .maxlen = sizeof(sysctl_nr_trim_pages),
2132 .mode = 0644,
2133 .proc_handler = proc_dointvec_minmax,
2134 .extra1 = SYSCTL_ZERO,
2135 },
2136#endif
2137 {
2138 .procname = "vfs_cache_pressure",
2139 .data = &sysctl_vfs_cache_pressure,
2140 .maxlen = sizeof(sysctl_vfs_cache_pressure),
2141 .mode = 0644,
2142 .proc_handler = proc_dointvec_minmax,
2143 .extra1 = SYSCTL_ZERO,
2144 },
2145#if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2146 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2147 {
2148 .procname = "legacy_va_layout",
2149 .data = &sysctl_legacy_va_layout,
2150 .maxlen = sizeof(sysctl_legacy_va_layout),
2151 .mode = 0644,
2152 .proc_handler = proc_dointvec_minmax,
2153 .extra1 = SYSCTL_ZERO,
2154 },
2155#endif
2156#ifdef CONFIG_NUMA
2157 {
2158 .procname = "zone_reclaim_mode",
2159 .data = &node_reclaim_mode,
2160 .maxlen = sizeof(node_reclaim_mode),
2161 .mode = 0644,
2162 .proc_handler = proc_dointvec_minmax,
2163 .extra1 = SYSCTL_ZERO,
2164 },
2165#endif
2166#ifdef CONFIG_SMP
2167 {
2168 .procname = "stat_interval",
2169 .data = &sysctl_stat_interval,
2170 .maxlen = sizeof(sysctl_stat_interval),
2171 .mode = 0644,
2172 .proc_handler = proc_dointvec_jiffies,
2173 },
2174 {
2175 .procname = "stat_refresh",
2176 .data = NULL,
2177 .maxlen = 0,
2178 .mode = 0600,
2179 .proc_handler = vmstat_refresh,
2180 },
2181#endif
2182#ifdef CONFIG_MMU
2183 {
2184 .procname = "mmap_min_addr",
2185 .data = &dac_mmap_min_addr,
2186 .maxlen = sizeof(unsigned long),
2187 .mode = 0644,
2188 .proc_handler = mmap_min_addr_handler,
2189 },
2190#endif
2191#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
2192 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
2193 {
2194 .procname = "vdso_enabled",
2195#ifdef CONFIG_X86_32
2196 .data = &vdso32_enabled,
2197 .maxlen = sizeof(vdso32_enabled),
2198#else
2199 .data = &vdso_enabled,
2200 .maxlen = sizeof(vdso_enabled),
2201#endif
2202 .mode = 0644,
2203 .proc_handler = proc_dointvec,
2204 .extra1 = SYSCTL_ZERO,
2205 },
2206#endif
2207 {
2208 .procname = "user_reserve_kbytes",
2209 .data = &sysctl_user_reserve_kbytes,
2210 .maxlen = sizeof(sysctl_user_reserve_kbytes),
2211 .mode = 0644,
2212 .proc_handler = proc_doulongvec_minmax,
2213 },
2214 {
2215 .procname = "admin_reserve_kbytes",
2216 .data = &sysctl_admin_reserve_kbytes,
2217 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
2218 .mode = 0644,
2219 .proc_handler = proc_doulongvec_minmax,
2220 },
2221#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
2222 {
2223 .procname = "mmap_rnd_bits",
2224 .data = &mmap_rnd_bits,
2225 .maxlen = sizeof(mmap_rnd_bits),
2226 .mode = 0600,
2227 .proc_handler = proc_dointvec_minmax,
2228 .extra1 = (void *)&mmap_rnd_bits_min,
2229 .extra2 = (void *)&mmap_rnd_bits_max,
2230 },
2231#endif
2232#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
2233 {
2234 .procname = "mmap_rnd_compat_bits",
2235 .data = &mmap_rnd_compat_bits,
2236 .maxlen = sizeof(mmap_rnd_compat_bits),
2237 .mode = 0600,
2238 .proc_handler = proc_dointvec_minmax,
2239 .extra1 = (void *)&mmap_rnd_compat_bits_min,
2240 .extra2 = (void *)&mmap_rnd_compat_bits_max,
2241 },
2242#endif
2243 { }
2244};
2245
2246int __init sysctl_init_bases(void)
2247{
2248 register_sysctl_init("kernel", kern_table);
2249 register_sysctl_init("vm", vm_table);
2250
2251 return 0;
2252}
2253#endif /* CONFIG_SYSCTL */
2254/*
2255 * No sense putting this after each symbol definition, twice,
2256 * exception granted :-)
2257 */
2258EXPORT_SYMBOL(proc_dobool);
2259EXPORT_SYMBOL(proc_dointvec);
2260EXPORT_SYMBOL(proc_douintvec);
2261EXPORT_SYMBOL(proc_dointvec_jiffies);
2262EXPORT_SYMBOL(proc_dointvec_minmax);
2263EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
2264EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2265EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2266EXPORT_SYMBOL(proc_dostring);
2267EXPORT_SYMBOL(proc_doulongvec_minmax);
2268EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2269EXPORT_SYMBOL(proc_do_large_bitmap);