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