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path: root/kernel/sysctl.c (plain)
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1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21#include <linux/module.h>
22#include <linux/aio.h>
23#include <linux/mm.h>
24#include <linux/swap.h>
25#include <linux/slab.h>
26#include <linux/sysctl.h>
27#include <linux/bitmap.h>
28#include <linux/signal.h>
29#include <linux/printk.h>
30#include <linux/proc_fs.h>
31#include <linux/security.h>
32#include <linux/ctype.h>
33#include <linux/kmemcheck.h>
34#include <linux/kmemleak.h>
35#include <linux/fs.h>
36#include <linux/init.h>
37#include <linux/kernel.h>
38#include <linux/kobject.h>
39#include <linux/net.h>
40#include <linux/sysrq.h>
41#include <linux/highuid.h>
42#include <linux/writeback.h>
43#include <linux/ratelimit.h>
44#include <linux/compaction.h>
45#include <linux/hugetlb.h>
46#include <linux/initrd.h>
47#include <linux/key.h>
48#include <linux/times.h>
49#include <linux/limits.h>
50#include <linux/dcache.h>
51#include <linux/dnotify.h>
52#include <linux/syscalls.h>
53#include <linux/vmstat.h>
54#include <linux/nfs_fs.h>
55#include <linux/acpi.h>
56#include <linux/reboot.h>
57#include <linux/ftrace.h>
58#include <linux/perf_event.h>
59#include <linux/kprobes.h>
60#include <linux/pipe_fs_i.h>
61#include <linux/oom.h>
62#include <linux/kmod.h>
63#include <linux/capability.h>
64#include <linux/binfmts.h>
65#include <linux/sched/sysctl.h>
66#include <linux/kexec.h>
67#include <linux/bpf.h>
68#include <linux/mount.h>
69
70#include <asm/uaccess.h>
71#include <asm/processor.h>
72
73#ifdef CONFIG_X86
74#include <asm/nmi.h>
75#include <asm/stacktrace.h>
76#include <asm/io.h>
77#endif
78#ifdef CONFIG_SPARC
79#include <asm/setup.h>
80#endif
81#ifdef CONFIG_BSD_PROCESS_ACCT
82#include <linux/acct.h>
83#endif
84#ifdef CONFIG_RT_MUTEXES
85#include <linux/rtmutex.h>
86#endif
87#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88#include <linux/lockdep.h>
89#endif
90#ifdef CONFIG_CHR_DEV_SG
91#include <scsi/sg.h>
92#endif
93
94#ifdef CONFIG_LOCKUP_DETECTOR
95#include <linux/nmi.h>
96#endif
97
98#if defined(CONFIG_SYSCTL)
99
100/* External variables not in a header file. */
101extern int suid_dumpable;
102#ifdef CONFIG_COREDUMP
103extern int core_uses_pid;
104extern char core_pattern[];
105extern unsigned int core_pipe_limit;
106#endif
107extern int pid_max;
108extern int extra_free_kbytes;
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 zero_ul;
129static unsigned long one_ul = 1;
130static unsigned long long_max = LONG_MAX;
131static int one_hundred = 100;
132static int one_thousand = 1000;
133#ifdef CONFIG_PRINTK
134static int ten_thousand = 10000;
135#endif
136#ifdef CONFIG_PERF_EVENTS
137static int six_hundred_forty_kb = 640 * 1024;
138#endif
139
140/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
141static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
142
143/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
144static int maxolduid = 65535;
145static int minolduid;
146
147static int ngroups_max = NGROUPS_MAX;
148static const int cap_last_cap = CAP_LAST_CAP;
149
150/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
151#ifdef CONFIG_DETECT_HUNG_TASK
152static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
153#endif
154
155#ifdef CONFIG_INOTIFY_USER
156#include <linux/inotify.h>
157#endif
158#ifdef CONFIG_SPARC
159#endif
160
161#ifdef __hppa__
162extern int pwrsw_enabled;
163#endif
164
165#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
166extern int unaligned_enabled;
167#endif
168
169#ifdef CONFIG_IA64
170extern int unaligned_dump_stack;
171#endif
172
173#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
174extern int no_unaligned_warning;
175#endif
176
177#ifdef CONFIG_PROC_SYSCTL
178
179#define SYSCTL_WRITES_LEGACY -1
180#define SYSCTL_WRITES_WARN 0
181#define SYSCTL_WRITES_STRICT 1
182
183static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
184
185static int proc_do_cad_pid(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
187static int proc_taint(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp, loff_t *ppos);
189#endif
190
191#ifdef CONFIG_PRINTK
192static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
193 void __user *buffer, size_t *lenp, loff_t *ppos);
194#endif
195
196static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
197 void __user *buffer, size_t *lenp, loff_t *ppos);
198#ifdef CONFIG_COREDUMP
199static int proc_dostring_coredump(struct ctl_table *table, int write,
200 void __user *buffer, size_t *lenp, loff_t *ppos);
201#endif
202
203#ifdef CONFIG_MAGIC_SYSRQ
204/* Note: sysrq code uses it's own private copy */
205static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
206
207static int sysrq_sysctl_handler(struct ctl_table *table, int write,
208 void __user *buffer, size_t *lenp,
209 loff_t *ppos)
210{
211 int error;
212
213 error = proc_dointvec(table, write, buffer, lenp, ppos);
214 if (error)
215 return error;
216
217 if (write)
218 sysrq_toggle_support(__sysrq_enabled);
219
220 return 0;
221}
222
223#endif
224
225static struct ctl_table kern_table[];
226static struct ctl_table vm_table[];
227static struct ctl_table fs_table[];
228static struct ctl_table debug_table[];
229static struct ctl_table dev_table[];
230extern struct ctl_table random_table[];
231#ifdef CONFIG_EPOLL
232extern struct ctl_table epoll_table[];
233#endif
234
235#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
236int sysctl_legacy_va_layout;
237#endif
238
239/* The default sysctl tables: */
240
241static struct ctl_table sysctl_base_table[] = {
242 {
243 .procname = "kernel",
244 .mode = 0555,
245 .child = kern_table,
246 },
247 {
248 .procname = "vm",
249 .mode = 0555,
250 .child = vm_table,
251 },
252 {
253 .procname = "fs",
254 .mode = 0555,
255 .child = fs_table,
256 },
257 {
258 .procname = "debug",
259 .mode = 0555,
260 .child = debug_table,
261 },
262 {
263 .procname = "dev",
264 .mode = 0555,
265 .child = dev_table,
266 },
267 { }
268};
269
270#ifdef CONFIG_SCHED_DEBUG
271static int min_sched_granularity_ns = 100000; /* 100 usecs */
272static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
273static int min_wakeup_granularity_ns; /* 0 usecs */
274static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
275#ifdef CONFIG_SMP
276static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
277static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
278#endif /* CONFIG_SMP */
279#endif /* CONFIG_SCHED_DEBUG */
280
281#ifdef CONFIG_COMPACTION
282static int min_extfrag_threshold;
283static int max_extfrag_threshold = 1000;
284#endif
285
286static struct ctl_table kern_table[] = {
287 {
288 .procname = "sched_child_runs_first",
289 .data = &sysctl_sched_child_runs_first,
290 .maxlen = sizeof(unsigned int),
291 .mode = 0644,
292 .proc_handler = proc_dointvec,
293 },
294#ifdef CONFIG_SCHED_DEBUG
295 {
296 .procname = "sched_min_granularity_ns",
297 .data = &sysctl_sched_min_granularity,
298 .maxlen = sizeof(unsigned int),
299 .mode = 0644,
300 .proc_handler = sched_proc_update_handler,
301 .extra1 = &min_sched_granularity_ns,
302 .extra2 = &max_sched_granularity_ns,
303 },
304 {
305 .procname = "sched_latency_ns",
306 .data = &sysctl_sched_latency,
307 .maxlen = sizeof(unsigned int),
308 .mode = 0644,
309 .proc_handler = sched_proc_update_handler,
310 .extra1 = &min_sched_granularity_ns,
311 .extra2 = &max_sched_granularity_ns,
312 },
313 {
314 .procname = "sched_sync_hint_enable",
315 .data = &sysctl_sched_sync_hint_enable,
316 .maxlen = sizeof(unsigned int),
317 .mode = 0644,
318 .proc_handler = proc_dointvec,
319 },
320#ifdef CONFIG_SCHED_WALT
321 {
322 .procname = "sched_use_walt_cpu_util",
323 .data = &sysctl_sched_use_walt_cpu_util,
324 .maxlen = sizeof(unsigned int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec,
327 },
328 {
329 .procname = "sched_use_walt_task_util",
330 .data = &sysctl_sched_use_walt_task_util,
331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
333 .proc_handler = proc_dointvec,
334 },
335 {
336 .procname = "sched_walt_init_task_load_pct",
337 .data = &sysctl_sched_walt_init_task_load_pct,
338 .maxlen = sizeof(unsigned int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec,
341 },
342 {
343 .procname = "sched_walt_cpu_high_irqload",
344 .data = &sysctl_sched_walt_cpu_high_irqload,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec,
348 },
349#endif
350 {
351 .procname = "sched_cstate_aware",
352 .data = &sysctl_sched_cstate_aware,
353 .maxlen = sizeof(unsigned int),
354 .mode = 0644,
355 .proc_handler = proc_dointvec,
356 },
357 {
358 .procname = "sched_wakeup_granularity_ns",
359 .data = &sysctl_sched_wakeup_granularity,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
362 .proc_handler = sched_proc_update_handler,
363 .extra1 = &min_wakeup_granularity_ns,
364 .extra2 = &max_wakeup_granularity_ns,
365 },
366#ifdef CONFIG_SMP
367 {
368 .procname = "sched_tunable_scaling",
369 .data = &sysctl_sched_tunable_scaling,
370 .maxlen = sizeof(enum sched_tunable_scaling),
371 .mode = 0644,
372 .proc_handler = sched_proc_update_handler,
373 .extra1 = &min_sched_tunable_scaling,
374 .extra2 = &max_sched_tunable_scaling,
375 },
376 {
377 .procname = "sched_migration_cost_ns",
378 .data = &sysctl_sched_migration_cost,
379 .maxlen = sizeof(unsigned int),
380 .mode = 0644,
381 .proc_handler = proc_dointvec,
382 },
383 {
384 .procname = "sched_nr_migrate",
385 .data = &sysctl_sched_nr_migrate,
386 .maxlen = sizeof(unsigned int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec,
389 },
390 {
391 .procname = "sched_time_avg_ms",
392 .data = &sysctl_sched_time_avg,
393 .maxlen = sizeof(unsigned int),
394 .mode = 0644,
395 .proc_handler = proc_dointvec_minmax,
396 .extra1 = &one,
397 },
398 {
399 .procname = "sched_shares_window_ns",
400 .data = &sysctl_sched_shares_window,
401 .maxlen = sizeof(unsigned int),
402 .mode = 0644,
403 .proc_handler = proc_dointvec,
404 },
405#ifdef CONFIG_SCHEDSTATS
406 {
407 .procname = "sched_schedstats",
408 .data = NULL,
409 .maxlen = sizeof(unsigned int),
410 .mode = 0644,
411 .proc_handler = sysctl_schedstats,
412 .extra1 = &zero,
413 .extra2 = &one,
414 },
415#endif /* CONFIG_SCHEDSTATS */
416#endif /* CONFIG_SMP */
417#ifdef CONFIG_NUMA_BALANCING
418 {
419 .procname = "numa_balancing_scan_delay_ms",
420 .data = &sysctl_numa_balancing_scan_delay,
421 .maxlen = sizeof(unsigned int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec,
424 },
425 {
426 .procname = "numa_balancing_scan_period_min_ms",
427 .data = &sysctl_numa_balancing_scan_period_min,
428 .maxlen = sizeof(unsigned int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec,
431 },
432 {
433 .procname = "numa_balancing_scan_period_max_ms",
434 .data = &sysctl_numa_balancing_scan_period_max,
435 .maxlen = sizeof(unsigned int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec,
438 },
439 {
440 .procname = "numa_balancing_scan_size_mb",
441 .data = &sysctl_numa_balancing_scan_size,
442 .maxlen = sizeof(unsigned int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec_minmax,
445 .extra1 = &one,
446 },
447 {
448 .procname = "numa_balancing",
449 .data = NULL, /* filled in by handler */
450 .maxlen = sizeof(unsigned int),
451 .mode = 0644,
452 .proc_handler = sysctl_numa_balancing,
453 .extra1 = &zero,
454 .extra2 = &one,
455 },
456#endif /* CONFIG_NUMA_BALANCING */
457#endif /* CONFIG_SCHED_DEBUG */
458 {
459 .procname = "sched_rt_period_us",
460 .data = &sysctl_sched_rt_period,
461 .maxlen = sizeof(unsigned int),
462 .mode = 0644,
463 .proc_handler = sched_rt_handler,
464 },
465 {
466 .procname = "sched_rt_runtime_us",
467 .data = &sysctl_sched_rt_runtime,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = sched_rt_handler,
471 },
472 {
473 .procname = "sched_rr_timeslice_ms",
474 .data = &sched_rr_timeslice,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = sched_rr_handler,
478 },
479#ifdef CONFIG_SCHED_AUTOGROUP
480 {
481 .procname = "sched_autogroup_enabled",
482 .data = &sysctl_sched_autogroup_enabled,
483 .maxlen = sizeof(unsigned int),
484 .mode = 0644,
485 .proc_handler = proc_dointvec_minmax,
486 .extra1 = &zero,
487 .extra2 = &one,
488 },
489#endif
490#ifdef CONFIG_CFS_BANDWIDTH
491 {
492 .procname = "sched_cfs_bandwidth_slice_us",
493 .data = &sysctl_sched_cfs_bandwidth_slice,
494 .maxlen = sizeof(unsigned int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec_minmax,
497 .extra1 = &one,
498 },
499#endif
500#ifdef CONFIG_SCHED_TUNE
501 {
502 .procname = "sched_cfs_boost",
503 .data = &sysctl_sched_cfs_boost,
504 .maxlen = sizeof(sysctl_sched_cfs_boost),
505#ifdef CONFIG_CGROUP_SCHEDTUNE
506 .mode = 0444,
507#else
508 .mode = 0644,
509#endif
510 .proc_handler = &sysctl_sched_cfs_boost_handler,
511 .extra1 = &zero,
512 .extra2 = &one_hundred,
513 },
514#endif
515#ifdef CONFIG_PROVE_LOCKING
516 {
517 .procname = "prove_locking",
518 .data = &prove_locking,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = proc_dointvec,
522 },
523#endif
524#ifdef CONFIG_LOCK_STAT
525 {
526 .procname = "lock_stat",
527 .data = &lock_stat,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec,
531 },
532#endif
533 {
534 .procname = "panic",
535 .data = &panic_timeout,
536 .maxlen = sizeof(int),
537 .mode = 0644,
538 .proc_handler = proc_dointvec,
539 },
540#ifdef CONFIG_COREDUMP
541 {
542 .procname = "core_uses_pid",
543 .data = &core_uses_pid,
544 .maxlen = sizeof(int),
545 .mode = 0644,
546 .proc_handler = proc_dointvec,
547 },
548 {
549 .procname = "core_pattern",
550 .data = core_pattern,
551 .maxlen = CORENAME_MAX_SIZE,
552 .mode = 0644,
553 .proc_handler = proc_dostring_coredump,
554 },
555 {
556 .procname = "core_pipe_limit",
557 .data = &core_pipe_limit,
558 .maxlen = sizeof(unsigned int),
559 .mode = 0644,
560 .proc_handler = proc_dointvec,
561 },
562#endif
563#ifdef CONFIG_PROC_SYSCTL
564 {
565 .procname = "tainted",
566 .maxlen = sizeof(long),
567 .mode = 0644,
568 .proc_handler = proc_taint,
569 },
570 {
571 .procname = "sysctl_writes_strict",
572 .data = &sysctl_writes_strict,
573 .maxlen = sizeof(int),
574 .mode = 0644,
575 .proc_handler = proc_dointvec_minmax,
576 .extra1 = &neg_one,
577 .extra2 = &one,
578 },
579#endif
580#ifdef CONFIG_LATENCYTOP
581 {
582 .procname = "latencytop",
583 .data = &latencytop_enabled,
584 .maxlen = sizeof(int),
585 .mode = 0644,
586 .proc_handler = sysctl_latencytop,
587 },
588#endif
589#ifdef CONFIG_BLK_DEV_INITRD
590 {
591 .procname = "real-root-dev",
592 .data = &real_root_dev,
593 .maxlen = sizeof(int),
594 .mode = 0644,
595 .proc_handler = proc_dointvec,
596 },
597#endif
598 {
599 .procname = "print-fatal-signals",
600 .data = &print_fatal_signals,
601 .maxlen = sizeof(int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec,
604 },
605#ifdef CONFIG_SPARC
606 {
607 .procname = "reboot-cmd",
608 .data = reboot_command,
609 .maxlen = 256,
610 .mode = 0644,
611 .proc_handler = proc_dostring,
612 },
613 {
614 .procname = "stop-a",
615 .data = &stop_a_enabled,
616 .maxlen = sizeof (int),
617 .mode = 0644,
618 .proc_handler = proc_dointvec,
619 },
620 {
621 .procname = "scons-poweroff",
622 .data = &scons_pwroff,
623 .maxlen = sizeof (int),
624 .mode = 0644,
625 .proc_handler = proc_dointvec,
626 },
627#endif
628#ifdef CONFIG_SPARC64
629 {
630 .procname = "tsb-ratio",
631 .data = &sysctl_tsb_ratio,
632 .maxlen = sizeof (int),
633 .mode = 0644,
634 .proc_handler = proc_dointvec,
635 },
636#endif
637#ifdef __hppa__
638 {
639 .procname = "soft-power",
640 .data = &pwrsw_enabled,
641 .maxlen = sizeof (int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec,
644 },
645#endif
646#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
647 {
648 .procname = "unaligned-trap",
649 .data = &unaligned_enabled,
650 .maxlen = sizeof (int),
651 .mode = 0644,
652 .proc_handler = proc_dointvec,
653 },
654#endif
655 {
656 .procname = "ctrl-alt-del",
657 .data = &C_A_D,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 .proc_handler = proc_dointvec,
661 },
662#ifdef CONFIG_FUNCTION_TRACER
663 {
664 .procname = "ftrace_enabled",
665 .data = &ftrace_enabled,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = ftrace_enable_sysctl,
669 },
670#endif
671#ifdef CONFIG_STACK_TRACER
672 {
673 .procname = "stack_tracer_enabled",
674 .data = &stack_tracer_enabled,
675 .maxlen = sizeof(int),
676 .mode = 0644,
677 .proc_handler = stack_trace_sysctl,
678 },
679#endif
680#ifdef CONFIG_TRACING
681 {
682 .procname = "ftrace_dump_on_oops",
683 .data = &ftrace_dump_on_oops,
684 .maxlen = sizeof(int),
685 .mode = 0644,
686 .proc_handler = proc_dointvec,
687 },
688 {
689 .procname = "traceoff_on_warning",
690 .data = &__disable_trace_on_warning,
691 .maxlen = sizeof(__disable_trace_on_warning),
692 .mode = 0644,
693 .proc_handler = proc_dointvec,
694 },
695 {
696 .procname = "tracepoint_printk",
697 .data = &tracepoint_printk,
698 .maxlen = sizeof(tracepoint_printk),
699 .mode = 0644,
700 .proc_handler = proc_dointvec,
701 },
702#endif
703#ifdef CONFIG_KEXEC_CORE
704 {
705 .procname = "kexec_load_disabled",
706 .data = &kexec_load_disabled,
707 .maxlen = sizeof(int),
708 .mode = 0644,
709 /* only handle a transition from default "0" to "1" */
710 .proc_handler = proc_dointvec_minmax,
711 .extra1 = &one,
712 .extra2 = &one,
713 },
714#endif
715#ifdef CONFIG_MODULES
716 {
717 .procname = "modprobe",
718 .data = &modprobe_path,
719 .maxlen = KMOD_PATH_LEN,
720 .mode = 0644,
721 .proc_handler = proc_dostring,
722 },
723 {
724 .procname = "modules_disabled",
725 .data = &modules_disabled,
726 .maxlen = sizeof(int),
727 .mode = 0644,
728 /* only handle a transition from default "0" to "1" */
729 .proc_handler = proc_dointvec_minmax,
730 .extra1 = &one,
731 .extra2 = &one,
732 },
733#endif
734#ifdef CONFIG_UEVENT_HELPER
735 {
736 .procname = "hotplug",
737 .data = &uevent_helper,
738 .maxlen = UEVENT_HELPER_PATH_LEN,
739 .mode = 0644,
740 .proc_handler = proc_dostring,
741 },
742#endif
743#ifdef CONFIG_CHR_DEV_SG
744 {
745 .procname = "sg-big-buff",
746 .data = &sg_big_buff,
747 .maxlen = sizeof (int),
748 .mode = 0444,
749 .proc_handler = proc_dointvec,
750 },
751#endif
752#ifdef CONFIG_BSD_PROCESS_ACCT
753 {
754 .procname = "acct",
755 .data = &acct_parm,
756 .maxlen = 3*sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec,
759 },
760#endif
761#ifdef CONFIG_MAGIC_SYSRQ
762 {
763 .procname = "sysrq",
764 .data = &__sysrq_enabled,
765 .maxlen = sizeof (int),
766 .mode = 0644,
767 .proc_handler = sysrq_sysctl_handler,
768 },
769#endif
770#ifdef CONFIG_PROC_SYSCTL
771 {
772 .procname = "cad_pid",
773 .data = NULL,
774 .maxlen = sizeof (int),
775 .mode = 0600,
776 .proc_handler = proc_do_cad_pid,
777 },
778#endif
779 {
780 .procname = "threads-max",
781 .data = NULL,
782 .maxlen = sizeof(int),
783 .mode = 0644,
784 .proc_handler = sysctl_max_threads,
785 },
786 {
787 .procname = "random",
788 .mode = 0555,
789 .child = random_table,
790 },
791 {
792 .procname = "usermodehelper",
793 .mode = 0555,
794 .child = usermodehelper_table,
795 },
796 {
797 .procname = "overflowuid",
798 .data = &overflowuid,
799 .maxlen = sizeof(int),
800 .mode = 0644,
801 .proc_handler = proc_dointvec_minmax,
802 .extra1 = &minolduid,
803 .extra2 = &maxolduid,
804 },
805 {
806 .procname = "overflowgid",
807 .data = &overflowgid,
808 .maxlen = sizeof(int),
809 .mode = 0644,
810 .proc_handler = proc_dointvec_minmax,
811 .extra1 = &minolduid,
812 .extra2 = &maxolduid,
813 },
814#ifdef CONFIG_S390
815#ifdef CONFIG_MATHEMU
816 {
817 .procname = "ieee_emulation_warnings",
818 .data = &sysctl_ieee_emulation_warnings,
819 .maxlen = sizeof(int),
820 .mode = 0644,
821 .proc_handler = proc_dointvec,
822 },
823#endif
824 {
825 .procname = "userprocess_debug",
826 .data = &show_unhandled_signals,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec,
830 },
831#endif
832 {
833 .procname = "pid_max",
834 .data = &pid_max,
835 .maxlen = sizeof (int),
836 .mode = 0644,
837 .proc_handler = proc_dointvec_minmax,
838 .extra1 = &pid_max_min,
839 .extra2 = &pid_max_max,
840 },
841 {
842 .procname = "panic_on_oops",
843 .data = &panic_on_oops,
844 .maxlen = sizeof(int),
845 .mode = 0644,
846 .proc_handler = proc_dointvec,
847 },
848#if defined CONFIG_PRINTK
849 {
850 .procname = "printk",
851 .data = &console_loglevel,
852 .maxlen = 4*sizeof(int),
853 .mode = 0644,
854 .proc_handler = proc_dointvec,
855 },
856 {
857 .procname = "printk_ratelimit",
858 .data = &printk_ratelimit_state.interval,
859 .maxlen = sizeof(int),
860 .mode = 0644,
861 .proc_handler = proc_dointvec_jiffies,
862 },
863 {
864 .procname = "printk_ratelimit_burst",
865 .data = &printk_ratelimit_state.burst,
866 .maxlen = sizeof(int),
867 .mode = 0644,
868 .proc_handler = proc_dointvec,
869 },
870 {
871 .procname = "printk_delay",
872 .data = &printk_delay_msec,
873 .maxlen = sizeof(int),
874 .mode = 0644,
875 .proc_handler = proc_dointvec_minmax,
876 .extra1 = &zero,
877 .extra2 = &ten_thousand,
878 },
879 {
880 .procname = "printk_devkmsg",
881 .data = devkmsg_log_str,
882 .maxlen = DEVKMSG_STR_MAX_SIZE,
883 .mode = 0644,
884 .proc_handler = devkmsg_sysctl_set_loglvl,
885 },
886 {
887 .procname = "dmesg_restrict",
888 .data = &dmesg_restrict,
889 .maxlen = sizeof(int),
890 .mode = 0644,
891 .proc_handler = proc_dointvec_minmax_sysadmin,
892 .extra1 = &zero,
893 .extra2 = &one,
894 },
895 {
896 .procname = "kptr_restrict",
897 .data = &kptr_restrict,
898 .maxlen = sizeof(int),
899 .mode = 0644,
900 .proc_handler = proc_dointvec_minmax_sysadmin,
901 .extra1 = &zero,
902 .extra2 = &two,
903 },
904#endif
905 {
906 .procname = "ngroups_max",
907 .data = &ngroups_max,
908 .maxlen = sizeof (int),
909 .mode = 0444,
910 .proc_handler = proc_dointvec,
911 },
912 {
913 .procname = "cap_last_cap",
914 .data = (void *)&cap_last_cap,
915 .maxlen = sizeof(int),
916 .mode = 0444,
917 .proc_handler = proc_dointvec,
918 },
919#if defined(CONFIG_LOCKUP_DETECTOR)
920 {
921 .procname = "watchdog",
922 .data = &watchdog_user_enabled,
923 .maxlen = sizeof (int),
924 .mode = 0644,
925 .proc_handler = proc_watchdog,
926 .extra1 = &zero,
927 .extra2 = &one,
928 },
929 {
930 .procname = "watchdog_thresh",
931 .data = &watchdog_thresh,
932 .maxlen = sizeof(int),
933 .mode = 0644,
934 .proc_handler = proc_watchdog_thresh,
935 .extra1 = &zero,
936 .extra2 = &sixty,
937 },
938 {
939 .procname = "nmi_watchdog",
940 .data = &nmi_watchdog_enabled,
941 .maxlen = sizeof (int),
942 .mode = 0644,
943 .proc_handler = proc_nmi_watchdog,
944 .extra1 = &zero,
945#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
946 .extra2 = &one,
947#else
948 .extra2 = &zero,
949#endif
950 },
951 {
952 .procname = "soft_watchdog",
953 .data = &soft_watchdog_enabled,
954 .maxlen = sizeof (int),
955 .mode = 0644,
956 .proc_handler = proc_soft_watchdog,
957 .extra1 = &zero,
958 .extra2 = &one,
959 },
960 {
961 .procname = "watchdog_cpumask",
962 .data = &watchdog_cpumask_bits,
963 .maxlen = NR_CPUS,
964 .mode = 0644,
965 .proc_handler = proc_watchdog_cpumask,
966 },
967 {
968 .procname = "softlockup_panic",
969 .data = &softlockup_panic,
970 .maxlen = sizeof(int),
971 .mode = 0644,
972 .proc_handler = proc_dointvec_minmax,
973 .extra1 = &zero,
974 .extra2 = &one,
975 },
976#if defined(CONFIG_HARDLOCKUP_DETECTOR)
977 {
978 .procname = "hardlockup_panic",
979 .data = &hardlockup_panic,
980 .maxlen = sizeof(int),
981 .mode = 0644,
982 .proc_handler = proc_dointvec_minmax,
983 .extra1 = &zero,
984 .extra2 = &one,
985 },
986#endif
987#ifdef CONFIG_SMP
988 {
989 .procname = "softlockup_all_cpu_backtrace",
990 .data = &sysctl_softlockup_all_cpu_backtrace,
991 .maxlen = sizeof(int),
992 .mode = 0644,
993 .proc_handler = proc_dointvec_minmax,
994 .extra1 = &zero,
995 .extra2 = &one,
996 },
997 {
998 .procname = "hardlockup_all_cpu_backtrace",
999 .data = &sysctl_hardlockup_all_cpu_backtrace,
1000 .maxlen = sizeof(int),
1001 .mode = 0644,
1002 .proc_handler = proc_dointvec_minmax,
1003 .extra1 = &zero,
1004 .extra2 = &one,
1005 },
1006#endif /* CONFIG_SMP */
1007#endif
1008#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1009 {
1010 .procname = "unknown_nmi_panic",
1011 .data = &unknown_nmi_panic,
1012 .maxlen = sizeof (int),
1013 .mode = 0644,
1014 .proc_handler = proc_dointvec,
1015 },
1016#endif
1017#if defined(CONFIG_X86)
1018 {
1019 .procname = "panic_on_unrecovered_nmi",
1020 .data = &panic_on_unrecovered_nmi,
1021 .maxlen = sizeof(int),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025 {
1026 .procname = "panic_on_io_nmi",
1027 .data = &panic_on_io_nmi,
1028 .maxlen = sizeof(int),
1029 .mode = 0644,
1030 .proc_handler = proc_dointvec,
1031 },
1032#ifdef CONFIG_DEBUG_STACKOVERFLOW
1033 {
1034 .procname = "panic_on_stackoverflow",
1035 .data = &sysctl_panic_on_stackoverflow,
1036 .maxlen = sizeof(int),
1037 .mode = 0644,
1038 .proc_handler = proc_dointvec,
1039 },
1040#endif
1041 {
1042 .procname = "bootloader_type",
1043 .data = &bootloader_type,
1044 .maxlen = sizeof (int),
1045 .mode = 0444,
1046 .proc_handler = proc_dointvec,
1047 },
1048 {
1049 .procname = "bootloader_version",
1050 .data = &bootloader_version,
1051 .maxlen = sizeof (int),
1052 .mode = 0444,
1053 .proc_handler = proc_dointvec,
1054 },
1055 {
1056 .procname = "kstack_depth_to_print",
1057 .data = &kstack_depth_to_print,
1058 .maxlen = sizeof(int),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec,
1061 },
1062 {
1063 .procname = "io_delay_type",
1064 .data = &io_delay_type,
1065 .maxlen = sizeof(int),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec,
1068 },
1069#endif
1070#if defined(CONFIG_MMU)
1071 {
1072 .procname = "randomize_va_space",
1073 .data = &randomize_va_space,
1074 .maxlen = sizeof(int),
1075 .mode = 0644,
1076 .proc_handler = proc_dointvec,
1077 },
1078#endif
1079#if defined(CONFIG_S390) && defined(CONFIG_SMP)
1080 {
1081 .procname = "spin_retry",
1082 .data = &spin_retry,
1083 .maxlen = sizeof (int),
1084 .mode = 0644,
1085 .proc_handler = proc_dointvec,
1086 },
1087#endif
1088#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1089 {
1090 .procname = "acpi_video_flags",
1091 .data = &acpi_realmode_flags,
1092 .maxlen = sizeof (unsigned long),
1093 .mode = 0644,
1094 .proc_handler = proc_doulongvec_minmax,
1095 },
1096#endif
1097#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1098 {
1099 .procname = "ignore-unaligned-usertrap",
1100 .data = &no_unaligned_warning,
1101 .maxlen = sizeof (int),
1102 .mode = 0644,
1103 .proc_handler = proc_dointvec,
1104 },
1105#endif
1106#ifdef CONFIG_IA64
1107 {
1108 .procname = "unaligned-dump-stack",
1109 .data = &unaligned_dump_stack,
1110 .maxlen = sizeof (int),
1111 .mode = 0644,
1112 .proc_handler = proc_dointvec,
1113 },
1114#endif
1115#ifdef CONFIG_DETECT_HUNG_TASK
1116 {
1117 .procname = "hung_task_panic",
1118 .data = &sysctl_hung_task_panic,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec_minmax,
1122 .extra1 = &zero,
1123 .extra2 = &one,
1124 },
1125 {
1126 .procname = "hung_task_check_count",
1127 .data = &sysctl_hung_task_check_count,
1128 .maxlen = sizeof(int),
1129 .mode = 0644,
1130 .proc_handler = proc_dointvec_minmax,
1131 .extra1 = &zero,
1132 },
1133 {
1134 .procname = "hung_task_timeout_secs",
1135 .data = &sysctl_hung_task_timeout_secs,
1136 .maxlen = sizeof(unsigned long),
1137 .mode = 0644,
1138 .proc_handler = proc_dohung_task_timeout_secs,
1139 .extra2 = &hung_task_timeout_max,
1140 },
1141 {
1142 .procname = "hung_task_warnings",
1143 .data = &sysctl_hung_task_warnings,
1144 .maxlen = sizeof(int),
1145 .mode = 0644,
1146 .proc_handler = proc_dointvec_minmax,
1147 .extra1 = &neg_one,
1148 },
1149#endif
1150#ifdef CONFIG_RT_MUTEXES
1151 {
1152 .procname = "max_lock_depth",
1153 .data = &max_lock_depth,
1154 .maxlen = sizeof(int),
1155 .mode = 0644,
1156 .proc_handler = proc_dointvec,
1157 },
1158#endif
1159 {
1160 .procname = "poweroff_cmd",
1161 .data = &poweroff_cmd,
1162 .maxlen = POWEROFF_CMD_PATH_LEN,
1163 .mode = 0644,
1164 .proc_handler = proc_dostring,
1165 },
1166#ifdef CONFIG_KEYS
1167 {
1168 .procname = "keys",
1169 .mode = 0555,
1170 .child = key_sysctls,
1171 },
1172#endif
1173#ifdef CONFIG_PERF_EVENTS
1174 /*
1175 * User-space scripts rely on the existence of this file
1176 * as a feature check for perf_events being enabled.
1177 *
1178 * So it's an ABI, do not remove!
1179 */
1180 {
1181 .procname = "perf_event_paranoid",
1182 .data = &sysctl_perf_event_paranoid,
1183 .maxlen = sizeof(sysctl_perf_event_paranoid),
1184 .mode = 0644,
1185 .proc_handler = proc_dointvec,
1186 },
1187 {
1188 .procname = "perf_event_mlock_kb",
1189 .data = &sysctl_perf_event_mlock,
1190 .maxlen = sizeof(sysctl_perf_event_mlock),
1191 .mode = 0644,
1192 .proc_handler = proc_dointvec,
1193 },
1194 {
1195 .procname = "perf_event_max_sample_rate",
1196 .data = &sysctl_perf_event_sample_rate,
1197 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1198 .mode = 0644,
1199 .proc_handler = perf_proc_update_handler,
1200 .extra1 = &one,
1201 },
1202 {
1203 .procname = "perf_cpu_time_max_percent",
1204 .data = &sysctl_perf_cpu_time_max_percent,
1205 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1206 .mode = 0644,
1207 .proc_handler = perf_cpu_time_max_percent_handler,
1208 .extra1 = &zero,
1209 .extra2 = &one_hundred,
1210 },
1211 {
1212 .procname = "perf_event_max_stack",
1213 .data = &sysctl_perf_event_max_stack,
1214 .maxlen = sizeof(sysctl_perf_event_max_stack),
1215 .mode = 0644,
1216 .proc_handler = perf_event_max_stack_handler,
1217 .extra1 = &zero,
1218 .extra2 = &six_hundred_forty_kb,
1219 },
1220 {
1221 .procname = "perf_event_max_contexts_per_stack",
1222 .data = &sysctl_perf_event_max_contexts_per_stack,
1223 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1224 .mode = 0644,
1225 .proc_handler = perf_event_max_stack_handler,
1226 .extra1 = &zero,
1227 .extra2 = &one_thousand,
1228 },
1229#endif
1230#ifdef CONFIG_KMEMCHECK
1231 {
1232 .procname = "kmemcheck",
1233 .data = &kmemcheck_enabled,
1234 .maxlen = sizeof(int),
1235 .mode = 0644,
1236 .proc_handler = proc_dointvec,
1237 },
1238#endif
1239 {
1240 .procname = "panic_on_warn",
1241 .data = &panic_on_warn,
1242 .maxlen = sizeof(int),
1243 .mode = 0644,
1244 .proc_handler = proc_dointvec_minmax,
1245 .extra1 = &zero,
1246 .extra2 = &one,
1247 },
1248#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1249 {
1250 .procname = "timer_migration",
1251 .data = &sysctl_timer_migration,
1252 .maxlen = sizeof(unsigned int),
1253 .mode = 0644,
1254 .proc_handler = timer_migration_handler,
1255 .extra1 = &zero,
1256 .extra2 = &one,
1257 },
1258#endif
1259#ifdef CONFIG_BPF_SYSCALL
1260 {
1261 .procname = "unprivileged_bpf_disabled",
1262 .data = &sysctl_unprivileged_bpf_disabled,
1263 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1264 .mode = 0644,
1265 /* only handle a transition from default "0" to "1" */
1266 .proc_handler = proc_dointvec_minmax,
1267 .extra1 = &one,
1268 .extra2 = &one,
1269 },
1270#endif
1271#if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1272 {
1273 .procname = "panic_on_rcu_stall",
1274 .data = &sysctl_panic_on_rcu_stall,
1275 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1276 .mode = 0644,
1277 .proc_handler = proc_dointvec_minmax,
1278 .extra1 = &zero,
1279 .extra2 = &one,
1280 },
1281#endif
1282 { }
1283};
1284
1285static struct ctl_table vm_table[] = {
1286 {
1287 .procname = "overcommit_memory",
1288 .data = &sysctl_overcommit_memory,
1289 .maxlen = sizeof(sysctl_overcommit_memory),
1290 .mode = 0644,
1291 .proc_handler = proc_dointvec_minmax,
1292 .extra1 = &zero,
1293 .extra2 = &two,
1294 },
1295 {
1296 .procname = "panic_on_oom",
1297 .data = &sysctl_panic_on_oom,
1298 .maxlen = sizeof(sysctl_panic_on_oom),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec_minmax,
1301 .extra1 = &zero,
1302 .extra2 = &two,
1303 },
1304 {
1305 .procname = "oom_kill_allocating_task",
1306 .data = &sysctl_oom_kill_allocating_task,
1307 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1308 .mode = 0644,
1309 .proc_handler = proc_dointvec,
1310 },
1311 {
1312 .procname = "oom_dump_tasks",
1313 .data = &sysctl_oom_dump_tasks,
1314 .maxlen = sizeof(sysctl_oom_dump_tasks),
1315 .mode = 0644,
1316 .proc_handler = proc_dointvec,
1317 },
1318 {
1319 .procname = "overcommit_ratio",
1320 .data = &sysctl_overcommit_ratio,
1321 .maxlen = sizeof(sysctl_overcommit_ratio),
1322 .mode = 0644,
1323 .proc_handler = overcommit_ratio_handler,
1324 },
1325 {
1326 .procname = "overcommit_kbytes",
1327 .data = &sysctl_overcommit_kbytes,
1328 .maxlen = sizeof(sysctl_overcommit_kbytes),
1329 .mode = 0644,
1330 .proc_handler = overcommit_kbytes_handler,
1331 },
1332 {
1333 .procname = "page-cluster",
1334 .data = &page_cluster,
1335 .maxlen = sizeof(int),
1336 .mode = 0644,
1337 .proc_handler = proc_dointvec_minmax,
1338 .extra1 = &zero,
1339 },
1340 {
1341 .procname = "dirty_background_ratio",
1342 .data = &dirty_background_ratio,
1343 .maxlen = sizeof(dirty_background_ratio),
1344 .mode = 0644,
1345 .proc_handler = dirty_background_ratio_handler,
1346 .extra1 = &zero,
1347 .extra2 = &one_hundred,
1348 },
1349 {
1350 .procname = "dirty_background_bytes",
1351 .data = &dirty_background_bytes,
1352 .maxlen = sizeof(dirty_background_bytes),
1353 .mode = 0644,
1354 .proc_handler = dirty_background_bytes_handler,
1355 .extra1 = &one_ul,
1356 },
1357 {
1358 .procname = "dirty_ratio",
1359 .data = &vm_dirty_ratio,
1360 .maxlen = sizeof(vm_dirty_ratio),
1361 .mode = 0644,
1362 .proc_handler = dirty_ratio_handler,
1363 .extra1 = &zero,
1364 .extra2 = &one_hundred,
1365 },
1366 {
1367 .procname = "dirty_bytes",
1368 .data = &vm_dirty_bytes,
1369 .maxlen = sizeof(vm_dirty_bytes),
1370 .mode = 0644,
1371 .proc_handler = dirty_bytes_handler,
1372 .extra1 = &dirty_bytes_min,
1373 },
1374 {
1375 .procname = "dirty_writeback_centisecs",
1376 .data = &dirty_writeback_interval,
1377 .maxlen = sizeof(dirty_writeback_interval),
1378 .mode = 0644,
1379 .proc_handler = dirty_writeback_centisecs_handler,
1380 },
1381 {
1382 .procname = "dirty_expire_centisecs",
1383 .data = &dirty_expire_interval,
1384 .maxlen = sizeof(dirty_expire_interval),
1385 .mode = 0644,
1386 .proc_handler = proc_dointvec_minmax,
1387 .extra1 = &zero,
1388 },
1389 {
1390 .procname = "dirtytime_expire_seconds",
1391 .data = &dirtytime_expire_interval,
1392 .maxlen = sizeof(dirty_expire_interval),
1393 .mode = 0644,
1394 .proc_handler = dirtytime_interval_handler,
1395 .extra1 = &zero,
1396 },
1397 {
1398 .procname = "nr_pdflush_threads",
1399 .mode = 0444 /* read-only */,
1400 .proc_handler = pdflush_proc_obsolete,
1401 },
1402 {
1403 .procname = "swappiness",
1404 .data = &vm_swappiness,
1405 .maxlen = sizeof(vm_swappiness),
1406 .mode = 0644,
1407 .proc_handler = proc_dointvec_minmax,
1408 .extra1 = &zero,
1409 .extra2 = &one_hundred,
1410 },
1411#ifdef CONFIG_HUGETLB_PAGE
1412 {
1413 .procname = "nr_hugepages",
1414 .data = NULL,
1415 .maxlen = sizeof(unsigned long),
1416 .mode = 0644,
1417 .proc_handler = hugetlb_sysctl_handler,
1418 },
1419#ifdef CONFIG_NUMA
1420 {
1421 .procname = "nr_hugepages_mempolicy",
1422 .data = NULL,
1423 .maxlen = sizeof(unsigned long),
1424 .mode = 0644,
1425 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1426 },
1427#endif
1428 {
1429 .procname = "hugetlb_shm_group",
1430 .data = &sysctl_hugetlb_shm_group,
1431 .maxlen = sizeof(gid_t),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec,
1434 },
1435 {
1436 .procname = "hugepages_treat_as_movable",
1437 .data = &hugepages_treat_as_movable,
1438 .maxlen = sizeof(int),
1439 .mode = 0644,
1440 .proc_handler = proc_dointvec,
1441 },
1442 {
1443 .procname = "nr_overcommit_hugepages",
1444 .data = NULL,
1445 .maxlen = sizeof(unsigned long),
1446 .mode = 0644,
1447 .proc_handler = hugetlb_overcommit_handler,
1448 },
1449#endif
1450 {
1451 .procname = "lowmem_reserve_ratio",
1452 .data = &sysctl_lowmem_reserve_ratio,
1453 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1454 .mode = 0644,
1455 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1456 },
1457 {
1458 .procname = "drop_caches",
1459 .data = &sysctl_drop_caches,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = drop_caches_sysctl_handler,
1463 .extra1 = &one,
1464 .extra2 = &four,
1465 },
1466#ifdef CONFIG_COMPACTION
1467 {
1468 .procname = "compact_memory",
1469 .data = &sysctl_compact_memory,
1470 .maxlen = sizeof(int),
1471 .mode = 0200,
1472 .proc_handler = sysctl_compaction_handler,
1473 },
1474 {
1475 .procname = "extfrag_threshold",
1476 .data = &sysctl_extfrag_threshold,
1477 .maxlen = sizeof(int),
1478 .mode = 0644,
1479 .proc_handler = sysctl_extfrag_handler,
1480 .extra1 = &min_extfrag_threshold,
1481 .extra2 = &max_extfrag_threshold,
1482 },
1483 {
1484 .procname = "compact_unevictable_allowed",
1485 .data = &sysctl_compact_unevictable_allowed,
1486 .maxlen = sizeof(int),
1487 .mode = 0644,
1488 .proc_handler = proc_dointvec,
1489 .extra1 = &zero,
1490 .extra2 = &one,
1491 },
1492
1493#endif /* CONFIG_COMPACTION */
1494 {
1495 .procname = "min_free_kbytes",
1496 .data = &min_free_kbytes,
1497 .maxlen = sizeof(min_free_kbytes),
1498 .mode = 0644,
1499 .proc_handler = min_free_kbytes_sysctl_handler,
1500 .extra1 = &zero,
1501 },
1502 {
1503 .procname = "watermark_scale_factor",
1504 .data = &watermark_scale_factor,
1505 .maxlen = sizeof(watermark_scale_factor),
1506 .mode = 0644,
1507 .proc_handler = watermark_scale_factor_sysctl_handler,
1508 .extra1 = &one,
1509 .extra2 = &one_thousand,
1510 },
1511 {
1512 .procname = "extra_free_kbytes",
1513 .data = &extra_free_kbytes,
1514 .maxlen = sizeof(extra_free_kbytes),
1515 .mode = 0644,
1516 .proc_handler = min_free_kbytes_sysctl_handler,
1517 .extra1 = &zero,
1518 },
1519 {
1520 .procname = "percpu_pagelist_fraction",
1521 .data = &percpu_pagelist_fraction,
1522 .maxlen = sizeof(percpu_pagelist_fraction),
1523 .mode = 0644,
1524 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1525 .extra1 = &zero,
1526 },
1527#ifdef CONFIG_MMU
1528 {
1529 .procname = "max_map_count",
1530 .data = &sysctl_max_map_count,
1531 .maxlen = sizeof(sysctl_max_map_count),
1532 .mode = 0644,
1533 .proc_handler = proc_dointvec_minmax,
1534 .extra1 = &zero,
1535 },
1536#else
1537 {
1538 .procname = "nr_trim_pages",
1539 .data = &sysctl_nr_trim_pages,
1540 .maxlen = sizeof(sysctl_nr_trim_pages),
1541 .mode = 0644,
1542 .proc_handler = proc_dointvec_minmax,
1543 .extra1 = &zero,
1544 },
1545#endif
1546 {
1547 .procname = "laptop_mode",
1548 .data = &laptop_mode,
1549 .maxlen = sizeof(laptop_mode),
1550 .mode = 0644,
1551 .proc_handler = proc_dointvec_jiffies,
1552 },
1553 {
1554 .procname = "block_dump",
1555 .data = &block_dump,
1556 .maxlen = sizeof(block_dump),
1557 .mode = 0644,
1558 .proc_handler = proc_dointvec,
1559 .extra1 = &zero,
1560 },
1561 {
1562 .procname = "vfs_cache_pressure",
1563 .data = &sysctl_vfs_cache_pressure,
1564 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1565 .mode = 0644,
1566 .proc_handler = proc_dointvec,
1567 .extra1 = &zero,
1568 },
1569#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1570 {
1571 .procname = "legacy_va_layout",
1572 .data = &sysctl_legacy_va_layout,
1573 .maxlen = sizeof(sysctl_legacy_va_layout),
1574 .mode = 0644,
1575 .proc_handler = proc_dointvec,
1576 .extra1 = &zero,
1577 },
1578#endif
1579#ifdef CONFIG_NUMA
1580 {
1581 .procname = "zone_reclaim_mode",
1582 .data = &node_reclaim_mode,
1583 .maxlen = sizeof(node_reclaim_mode),
1584 .mode = 0644,
1585 .proc_handler = proc_dointvec,
1586 .extra1 = &zero,
1587 },
1588 {
1589 .procname = "min_unmapped_ratio",
1590 .data = &sysctl_min_unmapped_ratio,
1591 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1592 .mode = 0644,
1593 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1594 .extra1 = &zero,
1595 .extra2 = &one_hundred,
1596 },
1597 {
1598 .procname = "min_slab_ratio",
1599 .data = &sysctl_min_slab_ratio,
1600 .maxlen = sizeof(sysctl_min_slab_ratio),
1601 .mode = 0644,
1602 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1603 .extra1 = &zero,
1604 .extra2 = &one_hundred,
1605 },
1606#endif
1607#ifdef CONFIG_SMP
1608 {
1609 .procname = "stat_interval",
1610 .data = &sysctl_stat_interval,
1611 .maxlen = sizeof(sysctl_stat_interval),
1612 .mode = 0644,
1613 .proc_handler = proc_dointvec_jiffies,
1614 },
1615 {
1616 .procname = "stat_refresh",
1617 .data = NULL,
1618 .maxlen = 0,
1619 .mode = 0600,
1620 .proc_handler = vmstat_refresh,
1621 },
1622#endif
1623#ifdef CONFIG_MMU
1624 {
1625 .procname = "mmap_min_addr",
1626 .data = &dac_mmap_min_addr,
1627 .maxlen = sizeof(unsigned long),
1628 .mode = 0644,
1629 .proc_handler = mmap_min_addr_handler,
1630 },
1631#endif
1632#ifdef CONFIG_NUMA
1633 {
1634 .procname = "numa_zonelist_order",
1635 .data = &numa_zonelist_order,
1636 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1637 .mode = 0644,
1638 .proc_handler = numa_zonelist_order_handler,
1639 },
1640#endif
1641#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1642 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1643 {
1644 .procname = "vdso_enabled",
1645#ifdef CONFIG_X86_32
1646 .data = &vdso32_enabled,
1647 .maxlen = sizeof(vdso32_enabled),
1648#else
1649 .data = &vdso_enabled,
1650 .maxlen = sizeof(vdso_enabled),
1651#endif
1652 .mode = 0644,
1653 .proc_handler = proc_dointvec,
1654 .extra1 = &zero,
1655 },
1656#endif
1657#ifdef CONFIG_HIGHMEM
1658 {
1659 .procname = "highmem_is_dirtyable",
1660 .data = &vm_highmem_is_dirtyable,
1661 .maxlen = sizeof(vm_highmem_is_dirtyable),
1662 .mode = 0644,
1663 .proc_handler = proc_dointvec_minmax,
1664 .extra1 = &zero,
1665 .extra2 = &one,
1666 },
1667#endif
1668#ifdef CONFIG_MEMORY_FAILURE
1669 {
1670 .procname = "memory_failure_early_kill",
1671 .data = &sysctl_memory_failure_early_kill,
1672 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1673 .mode = 0644,
1674 .proc_handler = proc_dointvec_minmax,
1675 .extra1 = &zero,
1676 .extra2 = &one,
1677 },
1678 {
1679 .procname = "memory_failure_recovery",
1680 .data = &sysctl_memory_failure_recovery,
1681 .maxlen = sizeof(sysctl_memory_failure_recovery),
1682 .mode = 0644,
1683 .proc_handler = proc_dointvec_minmax,
1684 .extra1 = &zero,
1685 .extra2 = &one,
1686 },
1687#endif
1688 {
1689 .procname = "user_reserve_kbytes",
1690 .data = &sysctl_user_reserve_kbytes,
1691 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1692 .mode = 0644,
1693 .proc_handler = proc_doulongvec_minmax,
1694 },
1695 {
1696 .procname = "admin_reserve_kbytes",
1697 .data = &sysctl_admin_reserve_kbytes,
1698 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1699 .mode = 0644,
1700 .proc_handler = proc_doulongvec_minmax,
1701 },
1702#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1703 {
1704 .procname = "mmap_rnd_bits",
1705 .data = &mmap_rnd_bits,
1706 .maxlen = sizeof(mmap_rnd_bits),
1707 .mode = 0600,
1708 .proc_handler = proc_dointvec_minmax,
1709 .extra1 = (void *)&mmap_rnd_bits_min,
1710 .extra2 = (void *)&mmap_rnd_bits_max,
1711 },
1712#endif
1713#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1714 {
1715 .procname = "mmap_rnd_compat_bits",
1716 .data = &mmap_rnd_compat_bits,
1717 .maxlen = sizeof(mmap_rnd_compat_bits),
1718 .mode = 0600,
1719 .proc_handler = proc_dointvec_minmax,
1720 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1721 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1722 },
1723#endif
1724 { }
1725};
1726
1727static struct ctl_table fs_table[] = {
1728 {
1729 .procname = "inode-nr",
1730 .data = &inodes_stat,
1731 .maxlen = 2*sizeof(long),
1732 .mode = 0444,
1733 .proc_handler = proc_nr_inodes,
1734 },
1735 {
1736 .procname = "inode-state",
1737 .data = &inodes_stat,
1738 .maxlen = 7*sizeof(long),
1739 .mode = 0444,
1740 .proc_handler = proc_nr_inodes,
1741 },
1742 {
1743 .procname = "file-nr",
1744 .data = &files_stat,
1745 .maxlen = sizeof(files_stat),
1746 .mode = 0444,
1747 .proc_handler = proc_nr_files,
1748 },
1749 {
1750 .procname = "file-max",
1751 .data = &files_stat.max_files,
1752 .maxlen = sizeof(files_stat.max_files),
1753 .mode = 0644,
1754 .proc_handler = proc_doulongvec_minmax,
1755 .extra1 = &zero_ul,
1756 .extra2 = &long_max,
1757 },
1758 {
1759 .procname = "nr_open",
1760 .data = &sysctl_nr_open,
1761 .maxlen = sizeof(unsigned int),
1762 .mode = 0644,
1763 .proc_handler = proc_dointvec_minmax,
1764 .extra1 = &sysctl_nr_open_min,
1765 .extra2 = &sysctl_nr_open_max,
1766 },
1767 {
1768 .procname = "dentry-state",
1769 .data = &dentry_stat,
1770 .maxlen = 6*sizeof(long),
1771 .mode = 0444,
1772 .proc_handler = proc_nr_dentry,
1773 },
1774 {
1775 .procname = "overflowuid",
1776 .data = &fs_overflowuid,
1777 .maxlen = sizeof(int),
1778 .mode = 0644,
1779 .proc_handler = proc_dointvec_minmax,
1780 .extra1 = &minolduid,
1781 .extra2 = &maxolduid,
1782 },
1783 {
1784 .procname = "overflowgid",
1785 .data = &fs_overflowgid,
1786 .maxlen = sizeof(int),
1787 .mode = 0644,
1788 .proc_handler = proc_dointvec_minmax,
1789 .extra1 = &minolduid,
1790 .extra2 = &maxolduid,
1791 },
1792#ifdef CONFIG_FILE_LOCKING
1793 {
1794 .procname = "leases-enable",
1795 .data = &leases_enable,
1796 .maxlen = sizeof(int),
1797 .mode = 0644,
1798 .proc_handler = proc_dointvec,
1799 },
1800#endif
1801#ifdef CONFIG_DNOTIFY
1802 {
1803 .procname = "dir-notify-enable",
1804 .data = &dir_notify_enable,
1805 .maxlen = sizeof(int),
1806 .mode = 0644,
1807 .proc_handler = proc_dointvec,
1808 },
1809#endif
1810#ifdef CONFIG_MMU
1811#ifdef CONFIG_FILE_LOCKING
1812 {
1813 .procname = "lease-break-time",
1814 .data = &lease_break_time,
1815 .maxlen = sizeof(int),
1816 .mode = 0644,
1817 .proc_handler = proc_dointvec,
1818 },
1819#endif
1820#ifdef CONFIG_AIO
1821 {
1822 .procname = "aio-nr",
1823 .data = &aio_nr,
1824 .maxlen = sizeof(aio_nr),
1825 .mode = 0444,
1826 .proc_handler = proc_doulongvec_minmax,
1827 },
1828 {
1829 .procname = "aio-max-nr",
1830 .data = &aio_max_nr,
1831 .maxlen = sizeof(aio_max_nr),
1832 .mode = 0644,
1833 .proc_handler = proc_doulongvec_minmax,
1834 },
1835#endif /* CONFIG_AIO */
1836#ifdef CONFIG_INOTIFY_USER
1837 {
1838 .procname = "inotify",
1839 .mode = 0555,
1840 .child = inotify_table,
1841 },
1842#endif
1843#ifdef CONFIG_EPOLL
1844 {
1845 .procname = "epoll",
1846 .mode = 0555,
1847 .child = epoll_table,
1848 },
1849#endif
1850#endif
1851 {
1852 .procname = "protected_symlinks",
1853 .data = &sysctl_protected_symlinks,
1854 .maxlen = sizeof(int),
1855 .mode = 0600,
1856 .proc_handler = proc_dointvec_minmax,
1857 .extra1 = &zero,
1858 .extra2 = &one,
1859 },
1860 {
1861 .procname = "protected_hardlinks",
1862 .data = &sysctl_protected_hardlinks,
1863 .maxlen = sizeof(int),
1864 .mode = 0600,
1865 .proc_handler = proc_dointvec_minmax,
1866 .extra1 = &zero,
1867 .extra2 = &one,
1868 },
1869 {
1870 .procname = "protected_fifos",
1871 .data = &sysctl_protected_fifos,
1872 .maxlen = sizeof(int),
1873 .mode = 0600,
1874 .proc_handler = proc_dointvec_minmax,
1875 .extra1 = &zero,
1876 .extra2 = &two,
1877 },
1878 {
1879 .procname = "protected_regular",
1880 .data = &sysctl_protected_regular,
1881 .maxlen = sizeof(int),
1882 .mode = 0600,
1883 .proc_handler = proc_dointvec_minmax,
1884 .extra1 = &zero,
1885 .extra2 = &two,
1886 },
1887 {
1888 .procname = "suid_dumpable",
1889 .data = &suid_dumpable,
1890 .maxlen = sizeof(int),
1891 .mode = 0644,
1892 .proc_handler = proc_dointvec_minmax_coredump,
1893 .extra1 = &zero,
1894 .extra2 = &two,
1895 },
1896#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1897 {
1898 .procname = "binfmt_misc",
1899 .mode = 0555,
1900 .child = sysctl_mount_point,
1901 },
1902#endif
1903 {
1904 .procname = "pipe-max-size",
1905 .data = &pipe_max_size,
1906 .maxlen = sizeof(int),
1907 .mode = 0644,
1908 .proc_handler = &pipe_proc_fn,
1909 .extra1 = &pipe_min_size,
1910 },
1911 {
1912 .procname = "pipe-user-pages-hard",
1913 .data = &pipe_user_pages_hard,
1914 .maxlen = sizeof(pipe_user_pages_hard),
1915 .mode = 0644,
1916 .proc_handler = proc_doulongvec_minmax,
1917 },
1918 {
1919 .procname = "pipe-user-pages-soft",
1920 .data = &pipe_user_pages_soft,
1921 .maxlen = sizeof(pipe_user_pages_soft),
1922 .mode = 0644,
1923 .proc_handler = proc_doulongvec_minmax,
1924 },
1925 {
1926 .procname = "mount-max",
1927 .data = &sysctl_mount_max,
1928 .maxlen = sizeof(unsigned int),
1929 .mode = 0644,
1930 .proc_handler = proc_dointvec_minmax,
1931 .extra1 = &one,
1932 },
1933 { }
1934};
1935
1936static struct ctl_table debug_table[] = {
1937#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1938 {
1939 .procname = "exception-trace",
1940 .data = &show_unhandled_signals,
1941 .maxlen = sizeof(int),
1942 .mode = 0644,
1943 .proc_handler = proc_dointvec
1944 },
1945#endif
1946#if defined(CONFIG_OPTPROBES)
1947 {
1948 .procname = "kprobes-optimization",
1949 .data = &sysctl_kprobes_optimization,
1950 .maxlen = sizeof(int),
1951 .mode = 0644,
1952 .proc_handler = proc_kprobes_optimization_handler,
1953 .extra1 = &zero,
1954 .extra2 = &one,
1955 },
1956#endif
1957 { }
1958};
1959
1960static struct ctl_table dev_table[] = {
1961 { }
1962};
1963
1964int __init sysctl_init(void)
1965{
1966 struct ctl_table_header *hdr;
1967
1968 hdr = register_sysctl_table(sysctl_base_table);
1969 kmemleak_not_leak(hdr);
1970 return 0;
1971}
1972
1973#endif /* CONFIG_SYSCTL */
1974
1975/*
1976 * /proc/sys support
1977 */
1978
1979#ifdef CONFIG_PROC_SYSCTL
1980
1981static int _proc_do_string(char *data, int maxlen, int write,
1982 char __user *buffer,
1983 size_t *lenp, loff_t *ppos)
1984{
1985 size_t len;
1986 char __user *p;
1987 char c;
1988
1989 if (!data || !maxlen || !*lenp) {
1990 *lenp = 0;
1991 return 0;
1992 }
1993
1994 if (write) {
1995 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1996 /* Only continue writes not past the end of buffer. */
1997 len = strlen(data);
1998 if (len > maxlen - 1)
1999 len = maxlen - 1;
2000
2001 if (*ppos > len)
2002 return 0;
2003 len = *ppos;
2004 } else {
2005 /* Start writing from beginning of buffer. */
2006 len = 0;
2007 }
2008
2009 *ppos += *lenp;
2010 p = buffer;
2011 while ((p - buffer) < *lenp && len < maxlen - 1) {
2012 if (get_user(c, p++))
2013 return -EFAULT;
2014 if (c == 0 || c == '\n')
2015 break;
2016 data[len++] = c;
2017 }
2018 data[len] = 0;
2019 } else {
2020 len = strlen(data);
2021 if (len > maxlen)
2022 len = maxlen;
2023
2024 if (*ppos > len) {
2025 *lenp = 0;
2026 return 0;
2027 }
2028
2029 data += *ppos;
2030 len -= *ppos;
2031
2032 if (len > *lenp)
2033 len = *lenp;
2034 if (len)
2035 if (copy_to_user(buffer, data, len))
2036 return -EFAULT;
2037 if (len < *lenp) {
2038 if (put_user('\n', buffer + len))
2039 return -EFAULT;
2040 len++;
2041 }
2042 *lenp = len;
2043 *ppos += len;
2044 }
2045 return 0;
2046}
2047
2048static void warn_sysctl_write(struct ctl_table *table)
2049{
2050 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2051 "This will not be supported in the future. To silence this\n"
2052 "warning, set kernel.sysctl_writes_strict = -1\n",
2053 current->comm, table->procname);
2054}
2055
2056/**
2057 * proc_dostring - read a string sysctl
2058 * @table: the sysctl table
2059 * @write: %TRUE if this is a write to the sysctl file
2060 * @buffer: the user buffer
2061 * @lenp: the size of the user buffer
2062 * @ppos: file position
2063 *
2064 * Reads/writes a string from/to the user buffer. If the kernel
2065 * buffer provided is not large enough to hold the string, the
2066 * string is truncated. The copied string is %NULL-terminated.
2067 * If the string is being read by the user process, it is copied
2068 * and a newline '\n' is added. It is truncated if the buffer is
2069 * not large enough.
2070 *
2071 * Returns 0 on success.
2072 */
2073int proc_dostring(struct ctl_table *table, int write,
2074 void __user *buffer, size_t *lenp, loff_t *ppos)
2075{
2076 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
2077 warn_sysctl_write(table);
2078
2079 return _proc_do_string((char *)(table->data), table->maxlen, write,
2080 (char __user *)buffer, lenp, ppos);
2081}
2082
2083static size_t proc_skip_spaces(char **buf)
2084{
2085 size_t ret;
2086 char *tmp = skip_spaces(*buf);
2087 ret = tmp - *buf;
2088 *buf = tmp;
2089 return ret;
2090}
2091
2092static void proc_skip_char(char **buf, size_t *size, const char v)
2093{
2094 while (*size) {
2095 if (**buf != v)
2096 break;
2097 (*size)--;
2098 (*buf)++;
2099 }
2100}
2101
2102#define TMPBUFLEN 22
2103/**
2104 * proc_get_long - reads an ASCII formatted integer from a user buffer
2105 *
2106 * @buf: a kernel buffer
2107 * @size: size of the kernel buffer
2108 * @val: this is where the number will be stored
2109 * @neg: set to %TRUE if number is negative
2110 * @perm_tr: a vector which contains the allowed trailers
2111 * @perm_tr_len: size of the perm_tr vector
2112 * @tr: pointer to store the trailer character
2113 *
2114 * In case of success %0 is returned and @buf and @size are updated with
2115 * the amount of bytes read. If @tr is non-NULL and a trailing
2116 * character exists (size is non-zero after returning from this
2117 * function), @tr is updated with the trailing character.
2118 */
2119static int proc_get_long(char **buf, size_t *size,
2120 unsigned long *val, bool *neg,
2121 const char *perm_tr, unsigned perm_tr_len, char *tr)
2122{
2123 int len;
2124 char *p, tmp[TMPBUFLEN];
2125
2126 if (!*size)
2127 return -EINVAL;
2128
2129 len = *size;
2130 if (len > TMPBUFLEN - 1)
2131 len = TMPBUFLEN - 1;
2132
2133 memcpy(tmp, *buf, len);
2134
2135 tmp[len] = 0;
2136 p = tmp;
2137 if (*p == '-' && *size > 1) {
2138 *neg = true;
2139 p++;
2140 } else
2141 *neg = false;
2142 if (!isdigit(*p))
2143 return -EINVAL;
2144
2145 *val = simple_strtoul(p, &p, 0);
2146
2147 len = p - tmp;
2148
2149 /* We don't know if the next char is whitespace thus we may accept
2150 * invalid integers (e.g. 1234...a) or two integers instead of one
2151 * (e.g. 123...1). So lets not allow such large numbers. */
2152 if (len == TMPBUFLEN - 1)
2153 return -EINVAL;
2154
2155 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2156 return -EINVAL;
2157
2158 if (tr && (len < *size))
2159 *tr = *p;
2160
2161 *buf += len;
2162 *size -= len;
2163
2164 return 0;
2165}
2166
2167/**
2168 * proc_put_long - converts an integer to a decimal ASCII formatted string
2169 *
2170 * @buf: the user buffer
2171 * @size: the size of the user buffer
2172 * @val: the integer to be converted
2173 * @neg: sign of the number, %TRUE for negative
2174 *
2175 * In case of success %0 is returned and @buf and @size are updated with
2176 * the amount of bytes written.
2177 */
2178static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2179 bool neg)
2180{
2181 int len;
2182 char tmp[TMPBUFLEN], *p = tmp;
2183
2184 sprintf(p, "%s%lu", neg ? "-" : "", val);
2185 len = strlen(tmp);
2186 if (len > *size)
2187 len = *size;
2188 if (copy_to_user(*buf, tmp, len))
2189 return -EFAULT;
2190 *size -= len;
2191 *buf += len;
2192 return 0;
2193}
2194#undef TMPBUFLEN
2195
2196static int proc_put_char(void __user **buf, size_t *size, char c)
2197{
2198 if (*size) {
2199 char __user **buffer = (char __user **)buf;
2200 if (put_user(c, *buffer))
2201 return -EFAULT;
2202 (*size)--, (*buffer)++;
2203 *buf = *buffer;
2204 }
2205 return 0;
2206}
2207
2208static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2209 int *valp,
2210 int write, void *data)
2211{
2212 if (write) {
2213 if (*negp) {
2214 if (*lvalp > (unsigned long) INT_MAX + 1)
2215 return -EINVAL;
2216 *valp = -*lvalp;
2217 } else {
2218 if (*lvalp > (unsigned long) INT_MAX)
2219 return -EINVAL;
2220 *valp = *lvalp;
2221 }
2222 } else {
2223 int val = *valp;
2224 if (val < 0) {
2225 *negp = true;
2226 *lvalp = -(unsigned long)val;
2227 } else {
2228 *negp = false;
2229 *lvalp = (unsigned long)val;
2230 }
2231 }
2232 return 0;
2233}
2234
2235static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2236 int *valp,
2237 int write, void *data)
2238{
2239 if (write) {
2240 if (*negp)
2241 return -EINVAL;
2242 if (*lvalp > UINT_MAX)
2243 return -EINVAL;
2244 *valp = *lvalp;
2245 } else {
2246 unsigned int val = *valp;
2247 *negp = false;
2248 *lvalp = (unsigned long)val;
2249 }
2250 return 0;
2251}
2252
2253static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2254
2255static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2256 int write, void __user *buffer,
2257 size_t *lenp, loff_t *ppos,
2258 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2259 int write, void *data),
2260 void *data)
2261{
2262 int *i, vleft, first = 1, err = 0;
2263 size_t left;
2264 char *kbuf = NULL, *p;
2265
2266 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2267 *lenp = 0;
2268 return 0;
2269 }
2270
2271 i = (int *) tbl_data;
2272 vleft = table->maxlen / sizeof(*i);
2273 left = *lenp;
2274
2275 if (!conv)
2276 conv = do_proc_dointvec_conv;
2277
2278 if (write) {
2279 if (*ppos) {
2280 switch (sysctl_writes_strict) {
2281 case SYSCTL_WRITES_STRICT:
2282 goto out;
2283 case SYSCTL_WRITES_WARN:
2284 warn_sysctl_write(table);
2285 break;
2286 default:
2287 break;
2288 }
2289 }
2290
2291 if (left > PAGE_SIZE - 1)
2292 left = PAGE_SIZE - 1;
2293 p = kbuf = memdup_user_nul(buffer, left);
2294 if (IS_ERR(kbuf))
2295 return PTR_ERR(kbuf);
2296 }
2297
2298 for (; left && vleft--; i++, first=0) {
2299 unsigned long lval;
2300 bool neg;
2301
2302 if (write) {
2303 left -= proc_skip_spaces(&p);
2304
2305 if (!left)
2306 break;
2307 err = proc_get_long(&p, &left, &lval, &neg,
2308 proc_wspace_sep,
2309 sizeof(proc_wspace_sep), NULL);
2310 if (err)
2311 break;
2312 if (conv(&neg, &lval, i, 1, data)) {
2313 err = -EINVAL;
2314 break;
2315 }
2316 } else {
2317 if (conv(&neg, &lval, i, 0, data)) {
2318 err = -EINVAL;
2319 break;
2320 }
2321 if (!first)
2322 err = proc_put_char(&buffer, &left, '\t');
2323 if (err)
2324 break;
2325 err = proc_put_long(&buffer, &left, lval, neg);
2326 if (err)
2327 break;
2328 }
2329 }
2330
2331 if (!write && !first && left && !err)
2332 err = proc_put_char(&buffer, &left, '\n');
2333 if (write && !err && left)
2334 left -= proc_skip_spaces(&p);
2335 if (write) {
2336 kfree(kbuf);
2337 if (first)
2338 return err ? : -EINVAL;
2339 }
2340 *lenp -= left;
2341out:
2342 *ppos += *lenp;
2343 return err;
2344}
2345
2346static int do_proc_dointvec(struct ctl_table *table, int write,
2347 void __user *buffer, size_t *lenp, loff_t *ppos,
2348 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2349 int write, void *data),
2350 void *data)
2351{
2352 return __do_proc_dointvec(table->data, table, write,
2353 buffer, lenp, ppos, conv, data);
2354}
2355
2356/**
2357 * proc_dointvec - read a vector of integers
2358 * @table: the sysctl table
2359 * @write: %TRUE if this is a write to the sysctl file
2360 * @buffer: the user buffer
2361 * @lenp: the size of the user buffer
2362 * @ppos: file position
2363 *
2364 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2365 * values from/to the user buffer, treated as an ASCII string.
2366 *
2367 * Returns 0 on success.
2368 */
2369int proc_dointvec(struct ctl_table *table, int write,
2370 void __user *buffer, size_t *lenp, loff_t *ppos)
2371{
2372 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2373}
2374
2375/**
2376 * proc_douintvec - read a vector of unsigned integers
2377 * @table: the sysctl table
2378 * @write: %TRUE if this is a write to the sysctl file
2379 * @buffer: the user buffer
2380 * @lenp: the size of the user buffer
2381 * @ppos: file position
2382 *
2383 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2384 * values from/to the user buffer, treated as an ASCII string.
2385 *
2386 * Returns 0 on success.
2387 */
2388int proc_douintvec(struct ctl_table *table, int write,
2389 void __user *buffer, size_t *lenp, loff_t *ppos)
2390{
2391 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2392 do_proc_douintvec_conv, NULL);
2393}
2394
2395/*
2396 * Taint values can only be increased
2397 * This means we can safely use a temporary.
2398 */
2399static int proc_taint(struct ctl_table *table, int write,
2400 void __user *buffer, size_t *lenp, loff_t *ppos)
2401{
2402 struct ctl_table t;
2403 unsigned long tmptaint = get_taint();
2404 int err;
2405
2406 if (write && !capable(CAP_SYS_ADMIN))
2407 return -EPERM;
2408
2409 t = *table;
2410 t.data = &tmptaint;
2411 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2412 if (err < 0)
2413 return err;
2414
2415 if (write) {
2416 /*
2417 * Poor man's atomic or. Not worth adding a primitive
2418 * to everyone's atomic.h for this
2419 */
2420 int i;
2421 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2422 if ((tmptaint >> i) & 1)
2423 add_taint(i, LOCKDEP_STILL_OK);
2424 }
2425 }
2426
2427 return err;
2428}
2429
2430#ifdef CONFIG_PRINTK
2431static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2432 void __user *buffer, size_t *lenp, loff_t *ppos)
2433{
2434 if (write && !capable(CAP_SYS_ADMIN))
2435 return -EPERM;
2436
2437 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2438}
2439#endif
2440
2441struct do_proc_dointvec_minmax_conv_param {
2442 int *min;
2443 int *max;
2444};
2445
2446static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2447 int *valp,
2448 int write, void *data)
2449{
2450 struct do_proc_dointvec_minmax_conv_param *param = data;
2451 if (write) {
2452 int val;
2453 if (*negp) {
2454 if (*lvalp > (unsigned long) INT_MAX + 1)
2455 return -EINVAL;
2456 val = -*lvalp;
2457 } else {
2458 if (*lvalp > (unsigned long) INT_MAX)
2459 return -EINVAL;
2460 val = *lvalp;
2461 }
2462 if ((param->min && *param->min > val) ||
2463 (param->max && *param->max < val))
2464 return -EINVAL;
2465 *valp = val;
2466 } else {
2467 int val = *valp;
2468 if (val < 0) {
2469 *negp = true;
2470 *lvalp = -(unsigned long)val;
2471 } else {
2472 *negp = false;
2473 *lvalp = (unsigned long)val;
2474 }
2475 }
2476 return 0;
2477}
2478
2479/**
2480 * proc_dointvec_minmax - read a vector of integers with min/max values
2481 * @table: the sysctl table
2482 * @write: %TRUE if this is a write to the sysctl file
2483 * @buffer: the user buffer
2484 * @lenp: the size of the user buffer
2485 * @ppos: file position
2486 *
2487 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2488 * values from/to the user buffer, treated as an ASCII string.
2489 *
2490 * This routine will ensure the values are within the range specified by
2491 * table->extra1 (min) and table->extra2 (max).
2492 *
2493 * Returns 0 on success.
2494 */
2495int proc_dointvec_minmax(struct ctl_table *table, int write,
2496 void __user *buffer, size_t *lenp, loff_t *ppos)
2497{
2498 struct do_proc_dointvec_minmax_conv_param param = {
2499 .min = (int *) table->extra1,
2500 .max = (int *) table->extra2,
2501 };
2502 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2503 do_proc_dointvec_minmax_conv, &param);
2504}
2505
2506static void validate_coredump_safety(void)
2507{
2508#ifdef CONFIG_COREDUMP
2509 if (suid_dumpable == SUID_DUMP_ROOT &&
2510 core_pattern[0] != '/' && core_pattern[0] != '|') {
2511 printk(KERN_WARNING "Unsafe core_pattern used with "\
2512 "suid_dumpable=2. Pipe handler or fully qualified "\
2513 "core dump path required.\n");
2514 }
2515#endif
2516}
2517
2518static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2519 void __user *buffer, size_t *lenp, loff_t *ppos)
2520{
2521 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2522 if (!error)
2523 validate_coredump_safety();
2524 return error;
2525}
2526
2527#ifdef CONFIG_COREDUMP
2528static int proc_dostring_coredump(struct ctl_table *table, int write,
2529 void __user *buffer, size_t *lenp, loff_t *ppos)
2530{
2531 int error = proc_dostring(table, write, buffer, lenp, ppos);
2532 if (!error)
2533 validate_coredump_safety();
2534 return error;
2535}
2536#endif
2537
2538static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2539 void __user *buffer,
2540 size_t *lenp, loff_t *ppos,
2541 unsigned long convmul,
2542 unsigned long convdiv)
2543{
2544 unsigned long *i, *min, *max;
2545 int vleft, first = 1, err = 0;
2546 size_t left;
2547 char *kbuf = NULL, *p;
2548
2549 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2550 *lenp = 0;
2551 return 0;
2552 }
2553
2554 i = (unsigned long *) data;
2555 min = (unsigned long *) table->extra1;
2556 max = (unsigned long *) table->extra2;
2557 vleft = table->maxlen / sizeof(unsigned long);
2558 left = *lenp;
2559
2560 if (write) {
2561 if (*ppos) {
2562 switch (sysctl_writes_strict) {
2563 case SYSCTL_WRITES_STRICT:
2564 goto out;
2565 case SYSCTL_WRITES_WARN:
2566 warn_sysctl_write(table);
2567 break;
2568 default:
2569 break;
2570 }
2571 }
2572
2573 if (left > PAGE_SIZE - 1)
2574 left = PAGE_SIZE - 1;
2575 p = kbuf = memdup_user_nul(buffer, left);
2576 if (IS_ERR(kbuf))
2577 return PTR_ERR(kbuf);
2578 }
2579
2580 for (; left && vleft--; i++, first = 0) {
2581 unsigned long val;
2582
2583 if (write) {
2584 bool neg;
2585
2586 left -= proc_skip_spaces(&p);
2587 if (!left)
2588 break;
2589
2590 err = proc_get_long(&p, &left, &val, &neg,
2591 proc_wspace_sep,
2592 sizeof(proc_wspace_sep), NULL);
2593 if (err)
2594 break;
2595 if (neg)
2596 continue;
2597 val = convmul * val / convdiv;
2598 if ((min && val < *min) || (max && val > *max))
2599 continue;
2600 *i = val;
2601 } else {
2602 val = convdiv * (*i) / convmul;
2603 if (!first) {
2604 err = proc_put_char(&buffer, &left, '\t');
2605 if (err)
2606 break;
2607 }
2608 err = proc_put_long(&buffer, &left, val, false);
2609 if (err)
2610 break;
2611 }
2612 }
2613
2614 if (!write && !first && left && !err)
2615 err = proc_put_char(&buffer, &left, '\n');
2616 if (write && !err)
2617 left -= proc_skip_spaces(&p);
2618 if (write) {
2619 kfree(kbuf);
2620 if (first)
2621 return err ? : -EINVAL;
2622 }
2623 *lenp -= left;
2624out:
2625 *ppos += *lenp;
2626 return err;
2627}
2628
2629static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2630 void __user *buffer,
2631 size_t *lenp, loff_t *ppos,
2632 unsigned long convmul,
2633 unsigned long convdiv)
2634{
2635 return __do_proc_doulongvec_minmax(table->data, table, write,
2636 buffer, lenp, ppos, convmul, convdiv);
2637}
2638
2639/**
2640 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2641 * @table: the sysctl table
2642 * @write: %TRUE if this is a write to the sysctl file
2643 * @buffer: the user buffer
2644 * @lenp: the size of the user buffer
2645 * @ppos: file position
2646 *
2647 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2648 * values from/to the user buffer, treated as an ASCII string.
2649 *
2650 * This routine will ensure the values are within the range specified by
2651 * table->extra1 (min) and table->extra2 (max).
2652 *
2653 * Returns 0 on success.
2654 */
2655int proc_doulongvec_minmax(struct ctl_table *table, int write,
2656 void __user *buffer, size_t *lenp, loff_t *ppos)
2657{
2658 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2659}
2660
2661/**
2662 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2663 * @table: the sysctl table
2664 * @write: %TRUE if this is a write to the sysctl file
2665 * @buffer: the user buffer
2666 * @lenp: the size of the user buffer
2667 * @ppos: file position
2668 *
2669 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2670 * values from/to the user buffer, treated as an ASCII string. The values
2671 * are treated as milliseconds, and converted to jiffies when they are stored.
2672 *
2673 * This routine will ensure the values are within the range specified by
2674 * table->extra1 (min) and table->extra2 (max).
2675 *
2676 * Returns 0 on success.
2677 */
2678int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2679 void __user *buffer,
2680 size_t *lenp, loff_t *ppos)
2681{
2682 return do_proc_doulongvec_minmax(table, write, buffer,
2683 lenp, ppos, HZ, 1000l);
2684}
2685
2686
2687static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2688 int *valp,
2689 int write, void *data)
2690{
2691 if (write) {
2692 if (*lvalp > LONG_MAX / HZ)
2693 return 1;
2694 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2695 } else {
2696 int val = *valp;
2697 unsigned long lval;
2698 if (val < 0) {
2699 *negp = true;
2700 lval = -(unsigned long)val;
2701 } else {
2702 *negp = false;
2703 lval = (unsigned long)val;
2704 }
2705 *lvalp = lval / HZ;
2706 }
2707 return 0;
2708}
2709
2710static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2711 int *valp,
2712 int write, void *data)
2713{
2714 if (write) {
2715 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2716 return 1;
2717 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2718 } else {
2719 int val = *valp;
2720 unsigned long lval;
2721 if (val < 0) {
2722 *negp = true;
2723 lval = -(unsigned long)val;
2724 } else {
2725 *negp = false;
2726 lval = (unsigned long)val;
2727 }
2728 *lvalp = jiffies_to_clock_t(lval);
2729 }
2730 return 0;
2731}
2732
2733static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2734 int *valp,
2735 int write, void *data)
2736{
2737 if (write) {
2738 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2739
2740 if (jif > INT_MAX)
2741 return 1;
2742 *valp = (int)jif;
2743 } else {
2744 int val = *valp;
2745 unsigned long lval;
2746 if (val < 0) {
2747 *negp = true;
2748 lval = -(unsigned long)val;
2749 } else {
2750 *negp = false;
2751 lval = (unsigned long)val;
2752 }
2753 *lvalp = jiffies_to_msecs(lval);
2754 }
2755 return 0;
2756}
2757
2758/**
2759 * proc_dointvec_jiffies - read a vector of integers as seconds
2760 * @table: the sysctl table
2761 * @write: %TRUE if this is a write to the sysctl file
2762 * @buffer: the user buffer
2763 * @lenp: the size of the user buffer
2764 * @ppos: file position
2765 *
2766 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2767 * values from/to the user buffer, treated as an ASCII string.
2768 * The values read are assumed to be in seconds, and are converted into
2769 * jiffies.
2770 *
2771 * Returns 0 on success.
2772 */
2773int proc_dointvec_jiffies(struct ctl_table *table, int write,
2774 void __user *buffer, size_t *lenp, loff_t *ppos)
2775{
2776 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2777 do_proc_dointvec_jiffies_conv,NULL);
2778}
2779
2780/**
2781 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2782 * @table: the sysctl table
2783 * @write: %TRUE if this is a write to the sysctl file
2784 * @buffer: the user buffer
2785 * @lenp: the size of the user buffer
2786 * @ppos: pointer to the file position
2787 *
2788 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2789 * values from/to the user buffer, treated as an ASCII string.
2790 * The values read are assumed to be in 1/USER_HZ seconds, and
2791 * are converted into jiffies.
2792 *
2793 * Returns 0 on success.
2794 */
2795int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2796 void __user *buffer, size_t *lenp, loff_t *ppos)
2797{
2798 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2799 do_proc_dointvec_userhz_jiffies_conv,NULL);
2800}
2801
2802/**
2803 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2804 * @table: the sysctl table
2805 * @write: %TRUE if this is a write to the sysctl file
2806 * @buffer: the user buffer
2807 * @lenp: the size of the user buffer
2808 * @ppos: file position
2809 * @ppos: the current position in the file
2810 *
2811 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2812 * values from/to the user buffer, treated as an ASCII string.
2813 * The values read are assumed to be in 1/1000 seconds, and
2814 * are converted into jiffies.
2815 *
2816 * Returns 0 on success.
2817 */
2818int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2819 void __user *buffer, size_t *lenp, loff_t *ppos)
2820{
2821 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2822 do_proc_dointvec_ms_jiffies_conv, NULL);
2823}
2824
2825static int proc_do_cad_pid(struct ctl_table *table, int write,
2826 void __user *buffer, size_t *lenp, loff_t *ppos)
2827{
2828 struct pid *new_pid;
2829 pid_t tmp;
2830 int r;
2831
2832 tmp = pid_vnr(cad_pid);
2833
2834 r = __do_proc_dointvec(&tmp, table, write, buffer,
2835 lenp, ppos, NULL, NULL);
2836 if (r || !write)
2837 return r;
2838
2839 new_pid = find_get_pid(tmp);
2840 if (!new_pid)
2841 return -ESRCH;
2842
2843 put_pid(xchg(&cad_pid, new_pid));
2844 return 0;
2845}
2846
2847/**
2848 * proc_do_large_bitmap - read/write from/to a large bitmap
2849 * @table: the sysctl table
2850 * @write: %TRUE if this is a write to the sysctl file
2851 * @buffer: the user buffer
2852 * @lenp: the size of the user buffer
2853 * @ppos: file position
2854 *
2855 * The bitmap is stored at table->data and the bitmap length (in bits)
2856 * in table->maxlen.
2857 *
2858 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2859 * large bitmaps may be represented in a compact manner. Writing into
2860 * the file will clear the bitmap then update it with the given input.
2861 *
2862 * Returns 0 on success.
2863 */
2864int proc_do_large_bitmap(struct ctl_table *table, int write,
2865 void __user *buffer, size_t *lenp, loff_t *ppos)
2866{
2867 int err = 0;
2868 bool first = 1;
2869 size_t left = *lenp;
2870 unsigned long bitmap_len = table->maxlen;
2871 unsigned long *bitmap = *(unsigned long **) table->data;
2872 unsigned long *tmp_bitmap = NULL;
2873 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2874
2875 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2876 *lenp = 0;
2877 return 0;
2878 }
2879
2880 if (write) {
2881 char *kbuf, *p;
2882
2883 if (left > PAGE_SIZE - 1)
2884 left = PAGE_SIZE - 1;
2885
2886 p = kbuf = memdup_user_nul(buffer, left);
2887 if (IS_ERR(kbuf))
2888 return PTR_ERR(kbuf);
2889
2890 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2891 GFP_KERNEL);
2892 if (!tmp_bitmap) {
2893 kfree(kbuf);
2894 return -ENOMEM;
2895 }
2896 proc_skip_char(&p, &left, '\n');
2897 while (!err && left) {
2898 unsigned long val_a, val_b;
2899 bool neg;
2900
2901 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2902 sizeof(tr_a), &c);
2903 if (err)
2904 break;
2905 if (val_a >= bitmap_len || neg) {
2906 err = -EINVAL;
2907 break;
2908 }
2909
2910 val_b = val_a;
2911 if (left) {
2912 p++;
2913 left--;
2914 }
2915
2916 if (c == '-') {
2917 err = proc_get_long(&p, &left, &val_b,
2918 &neg, tr_b, sizeof(tr_b),
2919 &c);
2920 if (err)
2921 break;
2922 if (val_b >= bitmap_len || neg ||
2923 val_a > val_b) {
2924 err = -EINVAL;
2925 break;
2926 }
2927 if (left) {
2928 p++;
2929 left--;
2930 }
2931 }
2932
2933 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2934 first = 0;
2935 proc_skip_char(&p, &left, '\n');
2936 }
2937 kfree(kbuf);
2938 } else {
2939 unsigned long bit_a, bit_b = 0;
2940
2941 while (left) {
2942 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2943 if (bit_a >= bitmap_len)
2944 break;
2945 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2946 bit_a + 1) - 1;
2947
2948 if (!first) {
2949 err = proc_put_char(&buffer, &left, ',');
2950 if (err)
2951 break;
2952 }
2953 err = proc_put_long(&buffer, &left, bit_a, false);
2954 if (err)
2955 break;
2956 if (bit_a != bit_b) {
2957 err = proc_put_char(&buffer, &left, '-');
2958 if (err)
2959 break;
2960 err = proc_put_long(&buffer, &left, bit_b, false);
2961 if (err)
2962 break;
2963 }
2964
2965 first = 0; bit_b++;
2966 }
2967 if (!err)
2968 err = proc_put_char(&buffer, &left, '\n');
2969 }
2970
2971 if (!err) {
2972 if (write) {
2973 if (*ppos)
2974 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2975 else
2976 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2977 }
2978 kfree(tmp_bitmap);
2979 *lenp -= left;
2980 *ppos += *lenp;
2981 return 0;
2982 } else {
2983 kfree(tmp_bitmap);
2984 return err;
2985 }
2986}
2987
2988#else /* CONFIG_PROC_SYSCTL */
2989
2990int proc_dostring(struct ctl_table *table, int write,
2991 void __user *buffer, size_t *lenp, loff_t *ppos)
2992{
2993 return -ENOSYS;
2994}
2995
2996int proc_dointvec(struct ctl_table *table, int write,
2997 void __user *buffer, size_t *lenp, loff_t *ppos)
2998{
2999 return -ENOSYS;
3000}
3001
3002int proc_douintvec(struct ctl_table *table, int write,
3003 void __user *buffer, size_t *lenp, loff_t *ppos)
3004{
3005 return -ENOSYS;
3006}
3007
3008int proc_dointvec_minmax(struct ctl_table *table, int write,
3009 void __user *buffer, size_t *lenp, loff_t *ppos)
3010{
3011 return -ENOSYS;
3012}
3013
3014int proc_dointvec_jiffies(struct ctl_table *table, int write,
3015 void __user *buffer, size_t *lenp, loff_t *ppos)
3016{
3017 return -ENOSYS;
3018}
3019
3020int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3021 void __user *buffer, size_t *lenp, loff_t *ppos)
3022{
3023 return -ENOSYS;
3024}
3025
3026int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3027 void __user *buffer, size_t *lenp, loff_t *ppos)
3028{
3029 return -ENOSYS;
3030}
3031
3032int proc_doulongvec_minmax(struct ctl_table *table, int write,
3033 void __user *buffer, size_t *lenp, loff_t *ppos)
3034{
3035 return -ENOSYS;
3036}
3037
3038int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3039 void __user *buffer,
3040 size_t *lenp, loff_t *ppos)
3041{
3042 return -ENOSYS;
3043}
3044
3045
3046#endif /* CONFIG_PROC_SYSCTL */
3047
3048/*
3049 * No sense putting this after each symbol definition, twice,
3050 * exception granted :-)
3051 */
3052EXPORT_SYMBOL(proc_dointvec);
3053EXPORT_SYMBOL(proc_douintvec);
3054EXPORT_SYMBOL(proc_dointvec_jiffies);
3055EXPORT_SYMBOL(proc_dointvec_minmax);
3056EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3057EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3058EXPORT_SYMBOL(proc_dostring);
3059EXPORT_SYMBOL(proc_doulongvec_minmax);
3060EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3061
generated by cgit at 2024-05-18 17:06:44 (GMT)