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