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Merge tag 'iwlwifi-for-kalle-2015-07-30' of https://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-artful-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/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
35 #include <linux/fs.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67
68 #include <asm/uaccess.h>
69 #include <asm/processor.h>
70
71 #ifdef CONFIG_X86
72 #include <asm/nmi.h>
73 #include <asm/stacktrace.h>
74 #include <asm/io.h>
75 #endif
76 #ifdef CONFIG_SPARC
77 #include <asm/setup.h>
78 #endif
79 #ifdef CONFIG_BSD_PROCESS_ACCT
80 #include <linux/acct.h>
81 #endif
82 #ifdef CONFIG_RT_MUTEXES
83 #include <linux/rtmutex.h>
84 #endif
85 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
86 #include <linux/lockdep.h>
87 #endif
88 #ifdef CONFIG_CHR_DEV_SG
89 #include <scsi/sg.h>
90 #endif
91
92 #ifdef CONFIG_LOCKUP_DETECTOR
93 #include <linux/nmi.h>
94 #endif
95
96 #if defined(CONFIG_SYSCTL)
97
98 /* External variables not in a header file. */
99 extern int suid_dumpable;
100 #ifdef CONFIG_COREDUMP
101 extern int core_uses_pid;
102 extern char core_pattern[];
103 extern unsigned int core_pipe_limit;
104 #endif
105 extern int pid_max;
106 extern int pid_max_min, pid_max_max;
107 extern int percpu_pagelist_fraction;
108 extern int compat_log;
109 extern int latencytop_enabled;
110 extern int sysctl_nr_open_min, sysctl_nr_open_max;
111 #ifndef CONFIG_MMU
112 extern int sysctl_nr_trim_pages;
113 #endif
114
115 /* Constants used for minimum and maximum */
116 #ifdef CONFIG_LOCKUP_DETECTOR
117 static int sixty = 60;
118 #endif
119
120 static int __maybe_unused neg_one = -1;
121
122 static int zero;
123 static int __maybe_unused one = 1;
124 static int __maybe_unused two = 2;
125 static int __maybe_unused four = 4;
126 static unsigned long one_ul = 1;
127 static int one_hundred = 100;
128 #ifdef CONFIG_PRINTK
129 static int ten_thousand = 10000;
130 #endif
131
132 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
133 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
134
135 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
136 static int maxolduid = 65535;
137 static int minolduid;
138
139 static int ngroups_max = NGROUPS_MAX;
140 static const int cap_last_cap = CAP_LAST_CAP;
141
142 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
143 #ifdef CONFIG_DETECT_HUNG_TASK
144 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
145 #endif
146
147 #ifdef CONFIG_INOTIFY_USER
148 #include <linux/inotify.h>
149 #endif
150 #ifdef CONFIG_SPARC
151 #endif
152
153 #ifdef __hppa__
154 extern int pwrsw_enabled;
155 #endif
156
157 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
158 extern int unaligned_enabled;
159 #endif
160
161 #ifdef CONFIG_IA64
162 extern int unaligned_dump_stack;
163 #endif
164
165 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
166 extern int no_unaligned_warning;
167 #endif
168
169 #ifdef CONFIG_PROC_SYSCTL
170
171 #define SYSCTL_WRITES_LEGACY -1
172 #define SYSCTL_WRITES_WARN 0
173 #define SYSCTL_WRITES_STRICT 1
174
175 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
176
177 static int proc_do_cad_pid(struct ctl_table *table, int write,
178 void __user *buffer, size_t *lenp, loff_t *ppos);
179 static int proc_taint(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
181 #endif
182
183 #ifdef CONFIG_PRINTK
184 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186 #endif
187
188 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
190 #ifdef CONFIG_COREDUMP
191 static int proc_dostring_coredump(struct ctl_table *table, int write,
192 void __user *buffer, size_t *lenp, loff_t *ppos);
193 #endif
194
195 #ifdef CONFIG_MAGIC_SYSRQ
196 /* Note: sysrq code uses it's own private copy */
197 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
198
199 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
200 void __user *buffer, size_t *lenp,
201 loff_t *ppos)
202 {
203 int error;
204
205 error = proc_dointvec(table, write, buffer, lenp, ppos);
206 if (error)
207 return error;
208
209 if (write)
210 sysrq_toggle_support(__sysrq_enabled);
211
212 return 0;
213 }
214
215 #endif
216
217 static struct ctl_table kern_table[];
218 static struct ctl_table vm_table[];
219 static struct ctl_table fs_table[];
220 static struct ctl_table debug_table[];
221 static struct ctl_table dev_table[];
222 extern struct ctl_table random_table[];
223 #ifdef CONFIG_EPOLL
224 extern struct ctl_table epoll_table[];
225 #endif
226
227 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
228 int sysctl_legacy_va_layout;
229 #endif
230
231 /* The default sysctl tables: */
232
233 static struct ctl_table sysctl_base_table[] = {
234 {
235 .procname = "kernel",
236 .mode = 0555,
237 .child = kern_table,
238 },
239 {
240 .procname = "vm",
241 .mode = 0555,
242 .child = vm_table,
243 },
244 {
245 .procname = "fs",
246 .mode = 0555,
247 .child = fs_table,
248 },
249 {
250 .procname = "debug",
251 .mode = 0555,
252 .child = debug_table,
253 },
254 {
255 .procname = "dev",
256 .mode = 0555,
257 .child = dev_table,
258 },
259 { }
260 };
261
262 #ifdef CONFIG_SCHED_DEBUG
263 static int min_sched_granularity_ns = 100000; /* 100 usecs */
264 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
265 static int min_wakeup_granularity_ns; /* 0 usecs */
266 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
267 #ifdef CONFIG_SMP
268 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
269 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
270 #endif /* CONFIG_SMP */
271 #endif /* CONFIG_SCHED_DEBUG */
272
273 #ifdef CONFIG_COMPACTION
274 static int min_extfrag_threshold;
275 static int max_extfrag_threshold = 1000;
276 #endif
277
278 static struct ctl_table kern_table[] = {
279 {
280 .procname = "sched_child_runs_first",
281 .data = &sysctl_sched_child_runs_first,
282 .maxlen = sizeof(unsigned int),
283 .mode = 0644,
284 .proc_handler = proc_dointvec,
285 },
286 #ifdef CONFIG_SCHED_DEBUG
287 {
288 .procname = "sched_min_granularity_ns",
289 .data = &sysctl_sched_min_granularity,
290 .maxlen = sizeof(unsigned int),
291 .mode = 0644,
292 .proc_handler = sched_proc_update_handler,
293 .extra1 = &min_sched_granularity_ns,
294 .extra2 = &max_sched_granularity_ns,
295 },
296 {
297 .procname = "sched_latency_ns",
298 .data = &sysctl_sched_latency,
299 .maxlen = sizeof(unsigned int),
300 .mode = 0644,
301 .proc_handler = sched_proc_update_handler,
302 .extra1 = &min_sched_granularity_ns,
303 .extra2 = &max_sched_granularity_ns,
304 },
305 {
306 .procname = "sched_wakeup_granularity_ns",
307 .data = &sysctl_sched_wakeup_granularity,
308 .maxlen = sizeof(unsigned int),
309 .mode = 0644,
310 .proc_handler = sched_proc_update_handler,
311 .extra1 = &min_wakeup_granularity_ns,
312 .extra2 = &max_wakeup_granularity_ns,
313 },
314 #ifdef CONFIG_SMP
315 {
316 .procname = "sched_tunable_scaling",
317 .data = &sysctl_sched_tunable_scaling,
318 .maxlen = sizeof(enum sched_tunable_scaling),
319 .mode = 0644,
320 .proc_handler = sched_proc_update_handler,
321 .extra1 = &min_sched_tunable_scaling,
322 .extra2 = &max_sched_tunable_scaling,
323 },
324 {
325 .procname = "sched_migration_cost_ns",
326 .data = &sysctl_sched_migration_cost,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec,
330 },
331 {
332 .procname = "sched_nr_migrate",
333 .data = &sysctl_sched_nr_migrate,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec,
337 },
338 {
339 .procname = "sched_time_avg_ms",
340 .data = &sysctl_sched_time_avg,
341 .maxlen = sizeof(unsigned int),
342 .mode = 0644,
343 .proc_handler = proc_dointvec,
344 },
345 {
346 .procname = "sched_shares_window_ns",
347 .data = &sysctl_sched_shares_window,
348 .maxlen = sizeof(unsigned int),
349 .mode = 0644,
350 .proc_handler = proc_dointvec,
351 },
352 #endif /* CONFIG_SMP */
353 #ifdef CONFIG_NUMA_BALANCING
354 {
355 .procname = "numa_balancing_scan_delay_ms",
356 .data = &sysctl_numa_balancing_scan_delay,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec,
360 },
361 {
362 .procname = "numa_balancing_scan_period_min_ms",
363 .data = &sysctl_numa_balancing_scan_period_min,
364 .maxlen = sizeof(unsigned int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec,
367 },
368 {
369 .procname = "numa_balancing_scan_period_max_ms",
370 .data = &sysctl_numa_balancing_scan_period_max,
371 .maxlen = sizeof(unsigned int),
372 .mode = 0644,
373 .proc_handler = proc_dointvec,
374 },
375 {
376 .procname = "numa_balancing_scan_size_mb",
377 .data = &sysctl_numa_balancing_scan_size,
378 .maxlen = sizeof(unsigned int),
379 .mode = 0644,
380 .proc_handler = proc_dointvec_minmax,
381 .extra1 = &one,
382 },
383 {
384 .procname = "numa_balancing",
385 .data = NULL, /* filled in by handler */
386 .maxlen = sizeof(unsigned int),
387 .mode = 0644,
388 .proc_handler = sysctl_numa_balancing,
389 .extra1 = &zero,
390 .extra2 = &one,
391 },
392 #endif /* CONFIG_NUMA_BALANCING */
393 #endif /* CONFIG_SCHED_DEBUG */
394 {
395 .procname = "sched_rt_period_us",
396 .data = &sysctl_sched_rt_period,
397 .maxlen = sizeof(unsigned int),
398 .mode = 0644,
399 .proc_handler = sched_rt_handler,
400 },
401 {
402 .procname = "sched_rt_runtime_us",
403 .data = &sysctl_sched_rt_runtime,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = sched_rt_handler,
407 },
408 {
409 .procname = "sched_rr_timeslice_ms",
410 .data = &sched_rr_timeslice,
411 .maxlen = sizeof(int),
412 .mode = 0644,
413 .proc_handler = sched_rr_handler,
414 },
415 #ifdef CONFIG_SCHED_AUTOGROUP
416 {
417 .procname = "sched_autogroup_enabled",
418 .data = &sysctl_sched_autogroup_enabled,
419 .maxlen = sizeof(unsigned int),
420 .mode = 0644,
421 .proc_handler = proc_dointvec_minmax,
422 .extra1 = &zero,
423 .extra2 = &one,
424 },
425 #endif
426 #ifdef CONFIG_CFS_BANDWIDTH
427 {
428 .procname = "sched_cfs_bandwidth_slice_us",
429 .data = &sysctl_sched_cfs_bandwidth_slice,
430 .maxlen = sizeof(unsigned int),
431 .mode = 0644,
432 .proc_handler = proc_dointvec_minmax,
433 .extra1 = &one,
434 },
435 #endif
436 #ifdef CONFIG_PROVE_LOCKING
437 {
438 .procname = "prove_locking",
439 .data = &prove_locking,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec,
443 },
444 #endif
445 #ifdef CONFIG_LOCK_STAT
446 {
447 .procname = "lock_stat",
448 .data = &lock_stat,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec,
452 },
453 #endif
454 {
455 .procname = "panic",
456 .data = &panic_timeout,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 #ifdef CONFIG_COREDUMP
462 {
463 .procname = "core_uses_pid",
464 .data = &core_uses_pid,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec,
468 },
469 {
470 .procname = "core_pattern",
471 .data = core_pattern,
472 .maxlen = CORENAME_MAX_SIZE,
473 .mode = 0644,
474 .proc_handler = proc_dostring_coredump,
475 },
476 {
477 .procname = "core_pipe_limit",
478 .data = &core_pipe_limit,
479 .maxlen = sizeof(unsigned int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 #endif
484 #ifdef CONFIG_PROC_SYSCTL
485 {
486 .procname = "tainted",
487 .maxlen = sizeof(long),
488 .mode = 0644,
489 .proc_handler = proc_taint,
490 },
491 {
492 .procname = "sysctl_writes_strict",
493 .data = &sysctl_writes_strict,
494 .maxlen = sizeof(int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec_minmax,
497 .extra1 = &neg_one,
498 .extra2 = &one,
499 },
500 #endif
501 #ifdef CONFIG_LATENCYTOP
502 {
503 .procname = "latencytop",
504 .data = &latencytop_enabled,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = proc_dointvec,
508 },
509 #endif
510 #ifdef CONFIG_BLK_DEV_INITRD
511 {
512 .procname = "real-root-dev",
513 .data = &real_root_dev,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec,
517 },
518 #endif
519 {
520 .procname = "print-fatal-signals",
521 .data = &print_fatal_signals,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec,
525 },
526 #ifdef CONFIG_SPARC
527 {
528 .procname = "reboot-cmd",
529 .data = reboot_command,
530 .maxlen = 256,
531 .mode = 0644,
532 .proc_handler = proc_dostring,
533 },
534 {
535 .procname = "stop-a",
536 .data = &stop_a_enabled,
537 .maxlen = sizeof (int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec,
540 },
541 {
542 .procname = "scons-poweroff",
543 .data = &scons_pwroff,
544 .maxlen = sizeof (int),
545 .mode = 0644,
546 .proc_handler = proc_dointvec,
547 },
548 #endif
549 #ifdef CONFIG_SPARC64
550 {
551 .procname = "tsb-ratio",
552 .data = &sysctl_tsb_ratio,
553 .maxlen = sizeof (int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec,
556 },
557 #endif
558 #ifdef __hppa__
559 {
560 .procname = "soft-power",
561 .data = &pwrsw_enabled,
562 .maxlen = sizeof (int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566 #endif
567 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
568 {
569 .procname = "unaligned-trap",
570 .data = &unaligned_enabled,
571 .maxlen = sizeof (int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec,
574 },
575 #endif
576 {
577 .procname = "ctrl-alt-del",
578 .data = &C_A_D,
579 .maxlen = sizeof(int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec,
582 },
583 #ifdef CONFIG_FUNCTION_TRACER
584 {
585 .procname = "ftrace_enabled",
586 .data = &ftrace_enabled,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .proc_handler = ftrace_enable_sysctl,
590 },
591 #endif
592 #ifdef CONFIG_STACK_TRACER
593 {
594 .procname = "stack_tracer_enabled",
595 .data = &stack_tracer_enabled,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = stack_trace_sysctl,
599 },
600 #endif
601 #ifdef CONFIG_TRACING
602 {
603 .procname = "ftrace_dump_on_oops",
604 .data = &ftrace_dump_on_oops,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = proc_dointvec,
608 },
609 {
610 .procname = "traceoff_on_warning",
611 .data = &__disable_trace_on_warning,
612 .maxlen = sizeof(__disable_trace_on_warning),
613 .mode = 0644,
614 .proc_handler = proc_dointvec,
615 },
616 {
617 .procname = "tracepoint_printk",
618 .data = &tracepoint_printk,
619 .maxlen = sizeof(tracepoint_printk),
620 .mode = 0644,
621 .proc_handler = proc_dointvec,
622 },
623 #endif
624 #ifdef CONFIG_KEXEC
625 {
626 .procname = "kexec_load_disabled",
627 .data = &kexec_load_disabled,
628 .maxlen = sizeof(int),
629 .mode = 0644,
630 /* only handle a transition from default "0" to "1" */
631 .proc_handler = proc_dointvec_minmax,
632 .extra1 = &one,
633 .extra2 = &one,
634 },
635 #endif
636 #ifdef CONFIG_MODULES
637 {
638 .procname = "modprobe",
639 .data = &modprobe_path,
640 .maxlen = KMOD_PATH_LEN,
641 .mode = 0644,
642 .proc_handler = proc_dostring,
643 },
644 {
645 .procname = "modules_disabled",
646 .data = &modules_disabled,
647 .maxlen = sizeof(int),
648 .mode = 0644,
649 /* only handle a transition from default "0" to "1" */
650 .proc_handler = proc_dointvec_minmax,
651 .extra1 = &one,
652 .extra2 = &one,
653 },
654 #endif
655 #ifdef CONFIG_UEVENT_HELPER
656 {
657 .procname = "hotplug",
658 .data = &uevent_helper,
659 .maxlen = UEVENT_HELPER_PATH_LEN,
660 .mode = 0644,
661 .proc_handler = proc_dostring,
662 },
663 #endif
664 #ifdef CONFIG_CHR_DEV_SG
665 {
666 .procname = "sg-big-buff",
667 .data = &sg_big_buff,
668 .maxlen = sizeof (int),
669 .mode = 0444,
670 .proc_handler = proc_dointvec,
671 },
672 #endif
673 #ifdef CONFIG_BSD_PROCESS_ACCT
674 {
675 .procname = "acct",
676 .data = &acct_parm,
677 .maxlen = 3*sizeof(int),
678 .mode = 0644,
679 .proc_handler = proc_dointvec,
680 },
681 #endif
682 #ifdef CONFIG_MAGIC_SYSRQ
683 {
684 .procname = "sysrq",
685 .data = &__sysrq_enabled,
686 .maxlen = sizeof (int),
687 .mode = 0644,
688 .proc_handler = sysrq_sysctl_handler,
689 },
690 #endif
691 #ifdef CONFIG_PROC_SYSCTL
692 {
693 .procname = "cad_pid",
694 .data = NULL,
695 .maxlen = sizeof (int),
696 .mode = 0600,
697 .proc_handler = proc_do_cad_pid,
698 },
699 #endif
700 {
701 .procname = "threads-max",
702 .data = NULL,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = sysctl_max_threads,
706 },
707 {
708 .procname = "random",
709 .mode = 0555,
710 .child = random_table,
711 },
712 {
713 .procname = "usermodehelper",
714 .mode = 0555,
715 .child = usermodehelper_table,
716 },
717 {
718 .procname = "overflowuid",
719 .data = &overflowuid,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = proc_dointvec_minmax,
723 .extra1 = &minolduid,
724 .extra2 = &maxolduid,
725 },
726 {
727 .procname = "overflowgid",
728 .data = &overflowgid,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec_minmax,
732 .extra1 = &minolduid,
733 .extra2 = &maxolduid,
734 },
735 #ifdef CONFIG_S390
736 #ifdef CONFIG_MATHEMU
737 {
738 .procname = "ieee_emulation_warnings",
739 .data = &sysctl_ieee_emulation_warnings,
740 .maxlen = sizeof(int),
741 .mode = 0644,
742 .proc_handler = proc_dointvec,
743 },
744 #endif
745 {
746 .procname = "userprocess_debug",
747 .data = &show_unhandled_signals,
748 .maxlen = sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec,
751 },
752 #endif
753 {
754 .procname = "pid_max",
755 .data = &pid_max,
756 .maxlen = sizeof (int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec_minmax,
759 .extra1 = &pid_max_min,
760 .extra2 = &pid_max_max,
761 },
762 {
763 .procname = "panic_on_oops",
764 .data = &panic_on_oops,
765 .maxlen = sizeof(int),
766 .mode = 0644,
767 .proc_handler = proc_dointvec,
768 },
769 #if defined CONFIG_PRINTK
770 {
771 .procname = "printk",
772 .data = &console_loglevel,
773 .maxlen = 4*sizeof(int),
774 .mode = 0644,
775 .proc_handler = proc_dointvec,
776 },
777 {
778 .procname = "printk_ratelimit",
779 .data = &printk_ratelimit_state.interval,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec_jiffies,
783 },
784 {
785 .procname = "printk_ratelimit_burst",
786 .data = &printk_ratelimit_state.burst,
787 .maxlen = sizeof(int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec,
790 },
791 {
792 .procname = "printk_delay",
793 .data = &printk_delay_msec,
794 .maxlen = sizeof(int),
795 .mode = 0644,
796 .proc_handler = proc_dointvec_minmax,
797 .extra1 = &zero,
798 .extra2 = &ten_thousand,
799 },
800 {
801 .procname = "dmesg_restrict",
802 .data = &dmesg_restrict,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec_minmax_sysadmin,
806 .extra1 = &zero,
807 .extra2 = &one,
808 },
809 {
810 .procname = "kptr_restrict",
811 .data = &kptr_restrict,
812 .maxlen = sizeof(int),
813 .mode = 0644,
814 .proc_handler = proc_dointvec_minmax_sysadmin,
815 .extra1 = &zero,
816 .extra2 = &two,
817 },
818 #endif
819 {
820 .procname = "ngroups_max",
821 .data = &ngroups_max,
822 .maxlen = sizeof (int),
823 .mode = 0444,
824 .proc_handler = proc_dointvec,
825 },
826 {
827 .procname = "cap_last_cap",
828 .data = (void *)&cap_last_cap,
829 .maxlen = sizeof(int),
830 .mode = 0444,
831 .proc_handler = proc_dointvec,
832 },
833 #if defined(CONFIG_LOCKUP_DETECTOR)
834 {
835 .procname = "watchdog",
836 .data = &watchdog_user_enabled,
837 .maxlen = sizeof (int),
838 .mode = 0644,
839 .proc_handler = proc_watchdog,
840 .extra1 = &zero,
841 .extra2 = &one,
842 },
843 {
844 .procname = "watchdog_thresh",
845 .data = &watchdog_thresh,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_watchdog_thresh,
849 .extra1 = &zero,
850 .extra2 = &sixty,
851 },
852 {
853 .procname = "nmi_watchdog",
854 .data = &nmi_watchdog_enabled,
855 .maxlen = sizeof (int),
856 .mode = 0644,
857 .proc_handler = proc_nmi_watchdog,
858 .extra1 = &zero,
859 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
860 .extra2 = &one,
861 #else
862 .extra2 = &zero,
863 #endif
864 },
865 {
866 .procname = "soft_watchdog",
867 .data = &soft_watchdog_enabled,
868 .maxlen = sizeof (int),
869 .mode = 0644,
870 .proc_handler = proc_soft_watchdog,
871 .extra1 = &zero,
872 .extra2 = &one,
873 },
874 {
875 .procname = "watchdog_cpumask",
876 .data = &watchdog_cpumask_bits,
877 .maxlen = NR_CPUS,
878 .mode = 0644,
879 .proc_handler = proc_watchdog_cpumask,
880 },
881 {
882 .procname = "softlockup_panic",
883 .data = &softlockup_panic,
884 .maxlen = sizeof(int),
885 .mode = 0644,
886 .proc_handler = proc_dointvec_minmax,
887 .extra1 = &zero,
888 .extra2 = &one,
889 },
890 #ifdef CONFIG_SMP
891 {
892 .procname = "softlockup_all_cpu_backtrace",
893 .data = &sysctl_softlockup_all_cpu_backtrace,
894 .maxlen = sizeof(int),
895 .mode = 0644,
896 .proc_handler = proc_dointvec_minmax,
897 .extra1 = &zero,
898 .extra2 = &one,
899 },
900 #endif /* CONFIG_SMP */
901 #endif
902 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
903 {
904 .procname = "unknown_nmi_panic",
905 .data = &unknown_nmi_panic,
906 .maxlen = sizeof (int),
907 .mode = 0644,
908 .proc_handler = proc_dointvec,
909 },
910 #endif
911 #if defined(CONFIG_X86)
912 {
913 .procname = "panic_on_unrecovered_nmi",
914 .data = &panic_on_unrecovered_nmi,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = proc_dointvec,
918 },
919 {
920 .procname = "panic_on_io_nmi",
921 .data = &panic_on_io_nmi,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec,
925 },
926 #ifdef CONFIG_DEBUG_STACKOVERFLOW
927 {
928 .procname = "panic_on_stackoverflow",
929 .data = &sysctl_panic_on_stackoverflow,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_dointvec,
933 },
934 #endif
935 {
936 .procname = "bootloader_type",
937 .data = &bootloader_type,
938 .maxlen = sizeof (int),
939 .mode = 0444,
940 .proc_handler = proc_dointvec,
941 },
942 {
943 .procname = "bootloader_version",
944 .data = &bootloader_version,
945 .maxlen = sizeof (int),
946 .mode = 0444,
947 .proc_handler = proc_dointvec,
948 },
949 {
950 .procname = "kstack_depth_to_print",
951 .data = &kstack_depth_to_print,
952 .maxlen = sizeof(int),
953 .mode = 0644,
954 .proc_handler = proc_dointvec,
955 },
956 {
957 .procname = "io_delay_type",
958 .data = &io_delay_type,
959 .maxlen = sizeof(int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec,
962 },
963 #endif
964 #if defined(CONFIG_MMU)
965 {
966 .procname = "randomize_va_space",
967 .data = &randomize_va_space,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec,
971 },
972 #endif
973 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
974 {
975 .procname = "spin_retry",
976 .data = &spin_retry,
977 .maxlen = sizeof (int),
978 .mode = 0644,
979 .proc_handler = proc_dointvec,
980 },
981 #endif
982 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
983 {
984 .procname = "acpi_video_flags",
985 .data = &acpi_realmode_flags,
986 .maxlen = sizeof (unsigned long),
987 .mode = 0644,
988 .proc_handler = proc_doulongvec_minmax,
989 },
990 #endif
991 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
992 {
993 .procname = "ignore-unaligned-usertrap",
994 .data = &no_unaligned_warning,
995 .maxlen = sizeof (int),
996 .mode = 0644,
997 .proc_handler = proc_dointvec,
998 },
999 #endif
1000 #ifdef CONFIG_IA64
1001 {
1002 .procname = "unaligned-dump-stack",
1003 .data = &unaligned_dump_stack,
1004 .maxlen = sizeof (int),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec,
1007 },
1008 #endif
1009 #ifdef CONFIG_DETECT_HUNG_TASK
1010 {
1011 .procname = "hung_task_panic",
1012 .data = &sysctl_hung_task_panic,
1013 .maxlen = sizeof(int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec_minmax,
1016 .extra1 = &zero,
1017 .extra2 = &one,
1018 },
1019 {
1020 .procname = "hung_task_check_count",
1021 .data = &sysctl_hung_task_check_count,
1022 .maxlen = sizeof(int),
1023 .mode = 0644,
1024 .proc_handler = proc_dointvec_minmax,
1025 .extra1 = &zero,
1026 },
1027 {
1028 .procname = "hung_task_timeout_secs",
1029 .data = &sysctl_hung_task_timeout_secs,
1030 .maxlen = sizeof(unsigned long),
1031 .mode = 0644,
1032 .proc_handler = proc_dohung_task_timeout_secs,
1033 .extra2 = &hung_task_timeout_max,
1034 },
1035 {
1036 .procname = "hung_task_warnings",
1037 .data = &sysctl_hung_task_warnings,
1038 .maxlen = sizeof(int),
1039 .mode = 0644,
1040 .proc_handler = proc_dointvec_minmax,
1041 .extra1 = &neg_one,
1042 },
1043 #endif
1044 #ifdef CONFIG_COMPAT
1045 {
1046 .procname = "compat-log",
1047 .data = &compat_log,
1048 .maxlen = sizeof (int),
1049 .mode = 0644,
1050 .proc_handler = proc_dointvec,
1051 },
1052 #endif
1053 #ifdef CONFIG_RT_MUTEXES
1054 {
1055 .procname = "max_lock_depth",
1056 .data = &max_lock_depth,
1057 .maxlen = sizeof(int),
1058 .mode = 0644,
1059 .proc_handler = proc_dointvec,
1060 },
1061 #endif
1062 {
1063 .procname = "poweroff_cmd",
1064 .data = &poweroff_cmd,
1065 .maxlen = POWEROFF_CMD_PATH_LEN,
1066 .mode = 0644,
1067 .proc_handler = proc_dostring,
1068 },
1069 #ifdef CONFIG_KEYS
1070 {
1071 .procname = "keys",
1072 .mode = 0555,
1073 .child = key_sysctls,
1074 },
1075 #endif
1076 #ifdef CONFIG_PERF_EVENTS
1077 /*
1078 * User-space scripts rely on the existence of this file
1079 * as a feature check for perf_events being enabled.
1080 *
1081 * So it's an ABI, do not remove!
1082 */
1083 {
1084 .procname = "perf_event_paranoid",
1085 .data = &sysctl_perf_event_paranoid,
1086 .maxlen = sizeof(sysctl_perf_event_paranoid),
1087 .mode = 0644,
1088 .proc_handler = proc_dointvec,
1089 },
1090 {
1091 .procname = "perf_event_mlock_kb",
1092 .data = &sysctl_perf_event_mlock,
1093 .maxlen = sizeof(sysctl_perf_event_mlock),
1094 .mode = 0644,
1095 .proc_handler = proc_dointvec,
1096 },
1097 {
1098 .procname = "perf_event_max_sample_rate",
1099 .data = &sysctl_perf_event_sample_rate,
1100 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1101 .mode = 0644,
1102 .proc_handler = perf_proc_update_handler,
1103 .extra1 = &one,
1104 },
1105 {
1106 .procname = "perf_cpu_time_max_percent",
1107 .data = &sysctl_perf_cpu_time_max_percent,
1108 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1109 .mode = 0644,
1110 .proc_handler = perf_cpu_time_max_percent_handler,
1111 .extra1 = &zero,
1112 .extra2 = &one_hundred,
1113 },
1114 #endif
1115 #ifdef CONFIG_KMEMCHECK
1116 {
1117 .procname = "kmemcheck",
1118 .data = &kmemcheck_enabled,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec,
1122 },
1123 #endif
1124 {
1125 .procname = "panic_on_warn",
1126 .data = &panic_on_warn,
1127 .maxlen = sizeof(int),
1128 .mode = 0644,
1129 .proc_handler = proc_dointvec_minmax,
1130 .extra1 = &zero,
1131 .extra2 = &one,
1132 },
1133 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1134 {
1135 .procname = "timer_migration",
1136 .data = &sysctl_timer_migration,
1137 .maxlen = sizeof(unsigned int),
1138 .mode = 0644,
1139 .proc_handler = timer_migration_handler,
1140 },
1141 #endif
1142 { }
1143 };
1144
1145 static struct ctl_table vm_table[] = {
1146 {
1147 .procname = "overcommit_memory",
1148 .data = &sysctl_overcommit_memory,
1149 .maxlen = sizeof(sysctl_overcommit_memory),
1150 .mode = 0644,
1151 .proc_handler = proc_dointvec_minmax,
1152 .extra1 = &zero,
1153 .extra2 = &two,
1154 },
1155 {
1156 .procname = "panic_on_oom",
1157 .data = &sysctl_panic_on_oom,
1158 .maxlen = sizeof(sysctl_panic_on_oom),
1159 .mode = 0644,
1160 .proc_handler = proc_dointvec_minmax,
1161 .extra1 = &zero,
1162 .extra2 = &two,
1163 },
1164 {
1165 .procname = "oom_kill_allocating_task",
1166 .data = &sysctl_oom_kill_allocating_task,
1167 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1168 .mode = 0644,
1169 .proc_handler = proc_dointvec,
1170 },
1171 {
1172 .procname = "oom_dump_tasks",
1173 .data = &sysctl_oom_dump_tasks,
1174 .maxlen = sizeof(sysctl_oom_dump_tasks),
1175 .mode = 0644,
1176 .proc_handler = proc_dointvec,
1177 },
1178 {
1179 .procname = "overcommit_ratio",
1180 .data = &sysctl_overcommit_ratio,
1181 .maxlen = sizeof(sysctl_overcommit_ratio),
1182 .mode = 0644,
1183 .proc_handler = overcommit_ratio_handler,
1184 },
1185 {
1186 .procname = "overcommit_kbytes",
1187 .data = &sysctl_overcommit_kbytes,
1188 .maxlen = sizeof(sysctl_overcommit_kbytes),
1189 .mode = 0644,
1190 .proc_handler = overcommit_kbytes_handler,
1191 },
1192 {
1193 .procname = "page-cluster",
1194 .data = &page_cluster,
1195 .maxlen = sizeof(int),
1196 .mode = 0644,
1197 .proc_handler = proc_dointvec_minmax,
1198 .extra1 = &zero,
1199 },
1200 {
1201 .procname = "dirty_background_ratio",
1202 .data = &dirty_background_ratio,
1203 .maxlen = sizeof(dirty_background_ratio),
1204 .mode = 0644,
1205 .proc_handler = dirty_background_ratio_handler,
1206 .extra1 = &zero,
1207 .extra2 = &one_hundred,
1208 },
1209 {
1210 .procname = "dirty_background_bytes",
1211 .data = &dirty_background_bytes,
1212 .maxlen = sizeof(dirty_background_bytes),
1213 .mode = 0644,
1214 .proc_handler = dirty_background_bytes_handler,
1215 .extra1 = &one_ul,
1216 },
1217 {
1218 .procname = "dirty_ratio",
1219 .data = &vm_dirty_ratio,
1220 .maxlen = sizeof(vm_dirty_ratio),
1221 .mode = 0644,
1222 .proc_handler = dirty_ratio_handler,
1223 .extra1 = &zero,
1224 .extra2 = &one_hundred,
1225 },
1226 {
1227 .procname = "dirty_bytes",
1228 .data = &vm_dirty_bytes,
1229 .maxlen = sizeof(vm_dirty_bytes),
1230 .mode = 0644,
1231 .proc_handler = dirty_bytes_handler,
1232 .extra1 = &dirty_bytes_min,
1233 },
1234 {
1235 .procname = "dirty_writeback_centisecs",
1236 .data = &dirty_writeback_interval,
1237 .maxlen = sizeof(dirty_writeback_interval),
1238 .mode = 0644,
1239 .proc_handler = dirty_writeback_centisecs_handler,
1240 },
1241 {
1242 .procname = "dirty_expire_centisecs",
1243 .data = &dirty_expire_interval,
1244 .maxlen = sizeof(dirty_expire_interval),
1245 .mode = 0644,
1246 .proc_handler = proc_dointvec_minmax,
1247 .extra1 = &zero,
1248 },
1249 {
1250 .procname = "dirtytime_expire_seconds",
1251 .data = &dirtytime_expire_interval,
1252 .maxlen = sizeof(dirty_expire_interval),
1253 .mode = 0644,
1254 .proc_handler = dirtytime_interval_handler,
1255 .extra1 = &zero,
1256 },
1257 {
1258 .procname = "nr_pdflush_threads",
1259 .mode = 0444 /* read-only */,
1260 .proc_handler = pdflush_proc_obsolete,
1261 },
1262 {
1263 .procname = "swappiness",
1264 .data = &vm_swappiness,
1265 .maxlen = sizeof(vm_swappiness),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec_minmax,
1268 .extra1 = &zero,
1269 .extra2 = &one_hundred,
1270 },
1271 #ifdef CONFIG_HUGETLB_PAGE
1272 {
1273 .procname = "nr_hugepages",
1274 .data = NULL,
1275 .maxlen = sizeof(unsigned long),
1276 .mode = 0644,
1277 .proc_handler = hugetlb_sysctl_handler,
1278 },
1279 #ifdef CONFIG_NUMA
1280 {
1281 .procname = "nr_hugepages_mempolicy",
1282 .data = NULL,
1283 .maxlen = sizeof(unsigned long),
1284 .mode = 0644,
1285 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1286 },
1287 #endif
1288 {
1289 .procname = "hugetlb_shm_group",
1290 .data = &sysctl_hugetlb_shm_group,
1291 .maxlen = sizeof(gid_t),
1292 .mode = 0644,
1293 .proc_handler = proc_dointvec,
1294 },
1295 {
1296 .procname = "hugepages_treat_as_movable",
1297 .data = &hugepages_treat_as_movable,
1298 .maxlen = sizeof(int),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec,
1301 },
1302 {
1303 .procname = "nr_overcommit_hugepages",
1304 .data = NULL,
1305 .maxlen = sizeof(unsigned long),
1306 .mode = 0644,
1307 .proc_handler = hugetlb_overcommit_handler,
1308 },
1309 #endif
1310 {
1311 .procname = "lowmem_reserve_ratio",
1312 .data = &sysctl_lowmem_reserve_ratio,
1313 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1314 .mode = 0644,
1315 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1316 },
1317 {
1318 .procname = "drop_caches",
1319 .data = &sysctl_drop_caches,
1320 .maxlen = sizeof(int),
1321 .mode = 0644,
1322 .proc_handler = drop_caches_sysctl_handler,
1323 .extra1 = &one,
1324 .extra2 = &four,
1325 },
1326 #ifdef CONFIG_COMPACTION
1327 {
1328 .procname = "compact_memory",
1329 .data = &sysctl_compact_memory,
1330 .maxlen = sizeof(int),
1331 .mode = 0200,
1332 .proc_handler = sysctl_compaction_handler,
1333 },
1334 {
1335 .procname = "extfrag_threshold",
1336 .data = &sysctl_extfrag_threshold,
1337 .maxlen = sizeof(int),
1338 .mode = 0644,
1339 .proc_handler = sysctl_extfrag_handler,
1340 .extra1 = &min_extfrag_threshold,
1341 .extra2 = &max_extfrag_threshold,
1342 },
1343 {
1344 .procname = "compact_unevictable_allowed",
1345 .data = &sysctl_compact_unevictable_allowed,
1346 .maxlen = sizeof(int),
1347 .mode = 0644,
1348 .proc_handler = proc_dointvec,
1349 .extra1 = &zero,
1350 .extra2 = &one,
1351 },
1352
1353 #endif /* CONFIG_COMPACTION */
1354 {
1355 .procname = "min_free_kbytes",
1356 .data = &min_free_kbytes,
1357 .maxlen = sizeof(min_free_kbytes),
1358 .mode = 0644,
1359 .proc_handler = min_free_kbytes_sysctl_handler,
1360 .extra1 = &zero,
1361 },
1362 {
1363 .procname = "percpu_pagelist_fraction",
1364 .data = &percpu_pagelist_fraction,
1365 .maxlen = sizeof(percpu_pagelist_fraction),
1366 .mode = 0644,
1367 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1368 .extra1 = &zero,
1369 },
1370 #ifdef CONFIG_MMU
1371 {
1372 .procname = "max_map_count",
1373 .data = &sysctl_max_map_count,
1374 .maxlen = sizeof(sysctl_max_map_count),
1375 .mode = 0644,
1376 .proc_handler = proc_dointvec_minmax,
1377 .extra1 = &zero,
1378 },
1379 #else
1380 {
1381 .procname = "nr_trim_pages",
1382 .data = &sysctl_nr_trim_pages,
1383 .maxlen = sizeof(sysctl_nr_trim_pages),
1384 .mode = 0644,
1385 .proc_handler = proc_dointvec_minmax,
1386 .extra1 = &zero,
1387 },
1388 #endif
1389 {
1390 .procname = "laptop_mode",
1391 .data = &laptop_mode,
1392 .maxlen = sizeof(laptop_mode),
1393 .mode = 0644,
1394 .proc_handler = proc_dointvec_jiffies,
1395 },
1396 {
1397 .procname = "block_dump",
1398 .data = &block_dump,
1399 .maxlen = sizeof(block_dump),
1400 .mode = 0644,
1401 .proc_handler = proc_dointvec,
1402 .extra1 = &zero,
1403 },
1404 {
1405 .procname = "vfs_cache_pressure",
1406 .data = &sysctl_vfs_cache_pressure,
1407 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1408 .mode = 0644,
1409 .proc_handler = proc_dointvec,
1410 .extra1 = &zero,
1411 },
1412 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1413 {
1414 .procname = "legacy_va_layout",
1415 .data = &sysctl_legacy_va_layout,
1416 .maxlen = sizeof(sysctl_legacy_va_layout),
1417 .mode = 0644,
1418 .proc_handler = proc_dointvec,
1419 .extra1 = &zero,
1420 },
1421 #endif
1422 #ifdef CONFIG_NUMA
1423 {
1424 .procname = "zone_reclaim_mode",
1425 .data = &zone_reclaim_mode,
1426 .maxlen = sizeof(zone_reclaim_mode),
1427 .mode = 0644,
1428 .proc_handler = proc_dointvec,
1429 .extra1 = &zero,
1430 },
1431 {
1432 .procname = "min_unmapped_ratio",
1433 .data = &sysctl_min_unmapped_ratio,
1434 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1435 .mode = 0644,
1436 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1437 .extra1 = &zero,
1438 .extra2 = &one_hundred,
1439 },
1440 {
1441 .procname = "min_slab_ratio",
1442 .data = &sysctl_min_slab_ratio,
1443 .maxlen = sizeof(sysctl_min_slab_ratio),
1444 .mode = 0644,
1445 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1446 .extra1 = &zero,
1447 .extra2 = &one_hundred,
1448 },
1449 #endif
1450 #ifdef CONFIG_SMP
1451 {
1452 .procname = "stat_interval",
1453 .data = &sysctl_stat_interval,
1454 .maxlen = sizeof(sysctl_stat_interval),
1455 .mode = 0644,
1456 .proc_handler = proc_dointvec_jiffies,
1457 },
1458 #endif
1459 #ifdef CONFIG_MMU
1460 {
1461 .procname = "mmap_min_addr",
1462 .data = &dac_mmap_min_addr,
1463 .maxlen = sizeof(unsigned long),
1464 .mode = 0644,
1465 .proc_handler = mmap_min_addr_handler,
1466 },
1467 #endif
1468 #ifdef CONFIG_NUMA
1469 {
1470 .procname = "numa_zonelist_order",
1471 .data = &numa_zonelist_order,
1472 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1473 .mode = 0644,
1474 .proc_handler = numa_zonelist_order_handler,
1475 },
1476 #endif
1477 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1478 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1479 {
1480 .procname = "vdso_enabled",
1481 #ifdef CONFIG_X86_32
1482 .data = &vdso32_enabled,
1483 .maxlen = sizeof(vdso32_enabled),
1484 #else
1485 .data = &vdso_enabled,
1486 .maxlen = sizeof(vdso_enabled),
1487 #endif
1488 .mode = 0644,
1489 .proc_handler = proc_dointvec,
1490 .extra1 = &zero,
1491 },
1492 #endif
1493 #ifdef CONFIG_HIGHMEM
1494 {
1495 .procname = "highmem_is_dirtyable",
1496 .data = &vm_highmem_is_dirtyable,
1497 .maxlen = sizeof(vm_highmem_is_dirtyable),
1498 .mode = 0644,
1499 .proc_handler = proc_dointvec_minmax,
1500 .extra1 = &zero,
1501 .extra2 = &one,
1502 },
1503 #endif
1504 #ifdef CONFIG_MEMORY_FAILURE
1505 {
1506 .procname = "memory_failure_early_kill",
1507 .data = &sysctl_memory_failure_early_kill,
1508 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1509 .mode = 0644,
1510 .proc_handler = proc_dointvec_minmax,
1511 .extra1 = &zero,
1512 .extra2 = &one,
1513 },
1514 {
1515 .procname = "memory_failure_recovery",
1516 .data = &sysctl_memory_failure_recovery,
1517 .maxlen = sizeof(sysctl_memory_failure_recovery),
1518 .mode = 0644,
1519 .proc_handler = proc_dointvec_minmax,
1520 .extra1 = &zero,
1521 .extra2 = &one,
1522 },
1523 #endif
1524 {
1525 .procname = "user_reserve_kbytes",
1526 .data = &sysctl_user_reserve_kbytes,
1527 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1528 .mode = 0644,
1529 .proc_handler = proc_doulongvec_minmax,
1530 },
1531 {
1532 .procname = "admin_reserve_kbytes",
1533 .data = &sysctl_admin_reserve_kbytes,
1534 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1535 .mode = 0644,
1536 .proc_handler = proc_doulongvec_minmax,
1537 },
1538 { }
1539 };
1540
1541 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1542 static struct ctl_table binfmt_misc_table[] = {
1543 { }
1544 };
1545 #endif
1546
1547 static struct ctl_table fs_table[] = {
1548 {
1549 .procname = "inode-nr",
1550 .data = &inodes_stat,
1551 .maxlen = 2*sizeof(long),
1552 .mode = 0444,
1553 .proc_handler = proc_nr_inodes,
1554 },
1555 {
1556 .procname = "inode-state",
1557 .data = &inodes_stat,
1558 .maxlen = 7*sizeof(long),
1559 .mode = 0444,
1560 .proc_handler = proc_nr_inodes,
1561 },
1562 {
1563 .procname = "file-nr",
1564 .data = &files_stat,
1565 .maxlen = sizeof(files_stat),
1566 .mode = 0444,
1567 .proc_handler = proc_nr_files,
1568 },
1569 {
1570 .procname = "file-max",
1571 .data = &files_stat.max_files,
1572 .maxlen = sizeof(files_stat.max_files),
1573 .mode = 0644,
1574 .proc_handler = proc_doulongvec_minmax,
1575 },
1576 {
1577 .procname = "nr_open",
1578 .data = &sysctl_nr_open,
1579 .maxlen = sizeof(int),
1580 .mode = 0644,
1581 .proc_handler = proc_dointvec_minmax,
1582 .extra1 = &sysctl_nr_open_min,
1583 .extra2 = &sysctl_nr_open_max,
1584 },
1585 {
1586 .procname = "dentry-state",
1587 .data = &dentry_stat,
1588 .maxlen = 6*sizeof(long),
1589 .mode = 0444,
1590 .proc_handler = proc_nr_dentry,
1591 },
1592 {
1593 .procname = "overflowuid",
1594 .data = &fs_overflowuid,
1595 .maxlen = sizeof(int),
1596 .mode = 0644,
1597 .proc_handler = proc_dointvec_minmax,
1598 .extra1 = &minolduid,
1599 .extra2 = &maxolduid,
1600 },
1601 {
1602 .procname = "overflowgid",
1603 .data = &fs_overflowgid,
1604 .maxlen = sizeof(int),
1605 .mode = 0644,
1606 .proc_handler = proc_dointvec_minmax,
1607 .extra1 = &minolduid,
1608 .extra2 = &maxolduid,
1609 },
1610 #ifdef CONFIG_FILE_LOCKING
1611 {
1612 .procname = "leases-enable",
1613 .data = &leases_enable,
1614 .maxlen = sizeof(int),
1615 .mode = 0644,
1616 .proc_handler = proc_dointvec,
1617 },
1618 #endif
1619 #ifdef CONFIG_DNOTIFY
1620 {
1621 .procname = "dir-notify-enable",
1622 .data = &dir_notify_enable,
1623 .maxlen = sizeof(int),
1624 .mode = 0644,
1625 .proc_handler = proc_dointvec,
1626 },
1627 #endif
1628 #ifdef CONFIG_MMU
1629 #ifdef CONFIG_FILE_LOCKING
1630 {
1631 .procname = "lease-break-time",
1632 .data = &lease_break_time,
1633 .maxlen = sizeof(int),
1634 .mode = 0644,
1635 .proc_handler = proc_dointvec,
1636 },
1637 #endif
1638 #ifdef CONFIG_AIO
1639 {
1640 .procname = "aio-nr",
1641 .data = &aio_nr,
1642 .maxlen = sizeof(aio_nr),
1643 .mode = 0444,
1644 .proc_handler = proc_doulongvec_minmax,
1645 },
1646 {
1647 .procname = "aio-max-nr",
1648 .data = &aio_max_nr,
1649 .maxlen = sizeof(aio_max_nr),
1650 .mode = 0644,
1651 .proc_handler = proc_doulongvec_minmax,
1652 },
1653 #endif /* CONFIG_AIO */
1654 #ifdef CONFIG_INOTIFY_USER
1655 {
1656 .procname = "inotify",
1657 .mode = 0555,
1658 .child = inotify_table,
1659 },
1660 #endif
1661 #ifdef CONFIG_EPOLL
1662 {
1663 .procname = "epoll",
1664 .mode = 0555,
1665 .child = epoll_table,
1666 },
1667 #endif
1668 #endif
1669 {
1670 .procname = "protected_symlinks",
1671 .data = &sysctl_protected_symlinks,
1672 .maxlen = sizeof(int),
1673 .mode = 0600,
1674 .proc_handler = proc_dointvec_minmax,
1675 .extra1 = &zero,
1676 .extra2 = &one,
1677 },
1678 {
1679 .procname = "protected_hardlinks",
1680 .data = &sysctl_protected_hardlinks,
1681 .maxlen = sizeof(int),
1682 .mode = 0600,
1683 .proc_handler = proc_dointvec_minmax,
1684 .extra1 = &zero,
1685 .extra2 = &one,
1686 },
1687 {
1688 .procname = "suid_dumpable",
1689 .data = &suid_dumpable,
1690 .maxlen = sizeof(int),
1691 .mode = 0644,
1692 .proc_handler = proc_dointvec_minmax_coredump,
1693 .extra1 = &zero,
1694 .extra2 = &two,
1695 },
1696 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1697 {
1698 .procname = "binfmt_misc",
1699 .mode = 0555,
1700 .child = binfmt_misc_table,
1701 },
1702 #endif
1703 {
1704 .procname = "pipe-max-size",
1705 .data = &pipe_max_size,
1706 .maxlen = sizeof(int),
1707 .mode = 0644,
1708 .proc_handler = &pipe_proc_fn,
1709 .extra1 = &pipe_min_size,
1710 },
1711 { }
1712 };
1713
1714 static struct ctl_table debug_table[] = {
1715 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1716 {
1717 .procname = "exception-trace",
1718 .data = &show_unhandled_signals,
1719 .maxlen = sizeof(int),
1720 .mode = 0644,
1721 .proc_handler = proc_dointvec
1722 },
1723 #endif
1724 #if defined(CONFIG_OPTPROBES)
1725 {
1726 .procname = "kprobes-optimization",
1727 .data = &sysctl_kprobes_optimization,
1728 .maxlen = sizeof(int),
1729 .mode = 0644,
1730 .proc_handler = proc_kprobes_optimization_handler,
1731 .extra1 = &zero,
1732 .extra2 = &one,
1733 },
1734 #endif
1735 { }
1736 };
1737
1738 static struct ctl_table dev_table[] = {
1739 { }
1740 };
1741
1742 int __init sysctl_init(void)
1743 {
1744 struct ctl_table_header *hdr;
1745
1746 hdr = register_sysctl_table(sysctl_base_table);
1747 kmemleak_not_leak(hdr);
1748 return 0;
1749 }
1750
1751 #endif /* CONFIG_SYSCTL */
1752
1753 /*
1754 * /proc/sys support
1755 */
1756
1757 #ifdef CONFIG_PROC_SYSCTL
1758
1759 static int _proc_do_string(char *data, int maxlen, int write,
1760 char __user *buffer,
1761 size_t *lenp, loff_t *ppos)
1762 {
1763 size_t len;
1764 char __user *p;
1765 char c;
1766
1767 if (!data || !maxlen || !*lenp) {
1768 *lenp = 0;
1769 return 0;
1770 }
1771
1772 if (write) {
1773 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1774 /* Only continue writes not past the end of buffer. */
1775 len = strlen(data);
1776 if (len > maxlen - 1)
1777 len = maxlen - 1;
1778
1779 if (*ppos > len)
1780 return 0;
1781 len = *ppos;
1782 } else {
1783 /* Start writing from beginning of buffer. */
1784 len = 0;
1785 }
1786
1787 *ppos += *lenp;
1788 p = buffer;
1789 while ((p - buffer) < *lenp && len < maxlen - 1) {
1790 if (get_user(c, p++))
1791 return -EFAULT;
1792 if (c == 0 || c == '\n')
1793 break;
1794 data[len++] = c;
1795 }
1796 data[len] = 0;
1797 } else {
1798 len = strlen(data);
1799 if (len > maxlen)
1800 len = maxlen;
1801
1802 if (*ppos > len) {
1803 *lenp = 0;
1804 return 0;
1805 }
1806
1807 data += *ppos;
1808 len -= *ppos;
1809
1810 if (len > *lenp)
1811 len = *lenp;
1812 if (len)
1813 if (copy_to_user(buffer, data, len))
1814 return -EFAULT;
1815 if (len < *lenp) {
1816 if (put_user('\n', buffer + len))
1817 return -EFAULT;
1818 len++;
1819 }
1820 *lenp = len;
1821 *ppos += len;
1822 }
1823 return 0;
1824 }
1825
1826 static void warn_sysctl_write(struct ctl_table *table)
1827 {
1828 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1829 "This will not be supported in the future. To silence this\n"
1830 "warning, set kernel.sysctl_writes_strict = -1\n",
1831 current->comm, table->procname);
1832 }
1833
1834 /**
1835 * proc_dostring - read a string sysctl
1836 * @table: the sysctl table
1837 * @write: %TRUE if this is a write to the sysctl file
1838 * @buffer: the user buffer
1839 * @lenp: the size of the user buffer
1840 * @ppos: file position
1841 *
1842 * Reads/writes a string from/to the user buffer. If the kernel
1843 * buffer provided is not large enough to hold the string, the
1844 * string is truncated. The copied string is %NULL-terminated.
1845 * If the string is being read by the user process, it is copied
1846 * and a newline '\n' is added. It is truncated if the buffer is
1847 * not large enough.
1848 *
1849 * Returns 0 on success.
1850 */
1851 int proc_dostring(struct ctl_table *table, int write,
1852 void __user *buffer, size_t *lenp, loff_t *ppos)
1853 {
1854 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1855 warn_sysctl_write(table);
1856
1857 return _proc_do_string((char *)(table->data), table->maxlen, write,
1858 (char __user *)buffer, lenp, ppos);
1859 }
1860
1861 static size_t proc_skip_spaces(char **buf)
1862 {
1863 size_t ret;
1864 char *tmp = skip_spaces(*buf);
1865 ret = tmp - *buf;
1866 *buf = tmp;
1867 return ret;
1868 }
1869
1870 static void proc_skip_char(char **buf, size_t *size, const char v)
1871 {
1872 while (*size) {
1873 if (**buf != v)
1874 break;
1875 (*size)--;
1876 (*buf)++;
1877 }
1878 }
1879
1880 #define TMPBUFLEN 22
1881 /**
1882 * proc_get_long - reads an ASCII formatted integer from a user buffer
1883 *
1884 * @buf: a kernel buffer
1885 * @size: size of the kernel buffer
1886 * @val: this is where the number will be stored
1887 * @neg: set to %TRUE if number is negative
1888 * @perm_tr: a vector which contains the allowed trailers
1889 * @perm_tr_len: size of the perm_tr vector
1890 * @tr: pointer to store the trailer character
1891 *
1892 * In case of success %0 is returned and @buf and @size are updated with
1893 * the amount of bytes read. If @tr is non-NULL and a trailing
1894 * character exists (size is non-zero after returning from this
1895 * function), @tr is updated with the trailing character.
1896 */
1897 static int proc_get_long(char **buf, size_t *size,
1898 unsigned long *val, bool *neg,
1899 const char *perm_tr, unsigned perm_tr_len, char *tr)
1900 {
1901 int len;
1902 char *p, tmp[TMPBUFLEN];
1903
1904 if (!*size)
1905 return -EINVAL;
1906
1907 len = *size;
1908 if (len > TMPBUFLEN - 1)
1909 len = TMPBUFLEN - 1;
1910
1911 memcpy(tmp, *buf, len);
1912
1913 tmp[len] = 0;
1914 p = tmp;
1915 if (*p == '-' && *size > 1) {
1916 *neg = true;
1917 p++;
1918 } else
1919 *neg = false;
1920 if (!isdigit(*p))
1921 return -EINVAL;
1922
1923 *val = simple_strtoul(p, &p, 0);
1924
1925 len = p - tmp;
1926
1927 /* We don't know if the next char is whitespace thus we may accept
1928 * invalid integers (e.g. 1234...a) or two integers instead of one
1929 * (e.g. 123...1). So lets not allow such large numbers. */
1930 if (len == TMPBUFLEN - 1)
1931 return -EINVAL;
1932
1933 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1934 return -EINVAL;
1935
1936 if (tr && (len < *size))
1937 *tr = *p;
1938
1939 *buf += len;
1940 *size -= len;
1941
1942 return 0;
1943 }
1944
1945 /**
1946 * proc_put_long - converts an integer to a decimal ASCII formatted string
1947 *
1948 * @buf: the user buffer
1949 * @size: the size of the user buffer
1950 * @val: the integer to be converted
1951 * @neg: sign of the number, %TRUE for negative
1952 *
1953 * In case of success %0 is returned and @buf and @size are updated with
1954 * the amount of bytes written.
1955 */
1956 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1957 bool neg)
1958 {
1959 int len;
1960 char tmp[TMPBUFLEN], *p = tmp;
1961
1962 sprintf(p, "%s%lu", neg ? "-" : "", val);
1963 len = strlen(tmp);
1964 if (len > *size)
1965 len = *size;
1966 if (copy_to_user(*buf, tmp, len))
1967 return -EFAULT;
1968 *size -= len;
1969 *buf += len;
1970 return 0;
1971 }
1972 #undef TMPBUFLEN
1973
1974 static int proc_put_char(void __user **buf, size_t *size, char c)
1975 {
1976 if (*size) {
1977 char __user **buffer = (char __user **)buf;
1978 if (put_user(c, *buffer))
1979 return -EFAULT;
1980 (*size)--, (*buffer)++;
1981 *buf = *buffer;
1982 }
1983 return 0;
1984 }
1985
1986 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1987 int *valp,
1988 int write, void *data)
1989 {
1990 if (write) {
1991 if (*negp) {
1992 if (*lvalp > (unsigned long) INT_MAX + 1)
1993 return -EINVAL;
1994 *valp = -*lvalp;
1995 } else {
1996 if (*lvalp > (unsigned long) INT_MAX)
1997 return -EINVAL;
1998 *valp = *lvalp;
1999 }
2000 } else {
2001 int val = *valp;
2002 if (val < 0) {
2003 *negp = true;
2004 *lvalp = (unsigned long)-val;
2005 } else {
2006 *negp = false;
2007 *lvalp = (unsigned long)val;
2008 }
2009 }
2010 return 0;
2011 }
2012
2013 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2014
2015 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2016 int write, void __user *buffer,
2017 size_t *lenp, loff_t *ppos,
2018 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2019 int write, void *data),
2020 void *data)
2021 {
2022 int *i, vleft, first = 1, err = 0;
2023 unsigned long page = 0;
2024 size_t left;
2025 char *kbuf;
2026
2027 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2028 *lenp = 0;
2029 return 0;
2030 }
2031
2032 i = (int *) tbl_data;
2033 vleft = table->maxlen / sizeof(*i);
2034 left = *lenp;
2035
2036 if (!conv)
2037 conv = do_proc_dointvec_conv;
2038
2039 if (write) {
2040 if (*ppos) {
2041 switch (sysctl_writes_strict) {
2042 case SYSCTL_WRITES_STRICT:
2043 goto out;
2044 case SYSCTL_WRITES_WARN:
2045 warn_sysctl_write(table);
2046 break;
2047 default:
2048 break;
2049 }
2050 }
2051
2052 if (left > PAGE_SIZE - 1)
2053 left = PAGE_SIZE - 1;
2054 page = __get_free_page(GFP_TEMPORARY);
2055 kbuf = (char *) page;
2056 if (!kbuf)
2057 return -ENOMEM;
2058 if (copy_from_user(kbuf, buffer, left)) {
2059 err = -EFAULT;
2060 goto free;
2061 }
2062 kbuf[left] = 0;
2063 }
2064
2065 for (; left && vleft--; i++, first=0) {
2066 unsigned long lval;
2067 bool neg;
2068
2069 if (write) {
2070 left -= proc_skip_spaces(&kbuf);
2071
2072 if (!left)
2073 break;
2074 err = proc_get_long(&kbuf, &left, &lval, &neg,
2075 proc_wspace_sep,
2076 sizeof(proc_wspace_sep), NULL);
2077 if (err)
2078 break;
2079 if (conv(&neg, &lval, i, 1, data)) {
2080 err = -EINVAL;
2081 break;
2082 }
2083 } else {
2084 if (conv(&neg, &lval, i, 0, data)) {
2085 err = -EINVAL;
2086 break;
2087 }
2088 if (!first)
2089 err = proc_put_char(&buffer, &left, '\t');
2090 if (err)
2091 break;
2092 err = proc_put_long(&buffer, &left, lval, neg);
2093 if (err)
2094 break;
2095 }
2096 }
2097
2098 if (!write && !first && left && !err)
2099 err = proc_put_char(&buffer, &left, '\n');
2100 if (write && !err && left)
2101 left -= proc_skip_spaces(&kbuf);
2102 free:
2103 if (write) {
2104 free_page(page);
2105 if (first)
2106 return err ? : -EINVAL;
2107 }
2108 *lenp -= left;
2109 out:
2110 *ppos += *lenp;
2111 return err;
2112 }
2113
2114 static int do_proc_dointvec(struct ctl_table *table, int write,
2115 void __user *buffer, size_t *lenp, loff_t *ppos,
2116 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2117 int write, void *data),
2118 void *data)
2119 {
2120 return __do_proc_dointvec(table->data, table, write,
2121 buffer, lenp, ppos, conv, data);
2122 }
2123
2124 /**
2125 * proc_dointvec - read a vector of integers
2126 * @table: the sysctl table
2127 * @write: %TRUE if this is a write to the sysctl file
2128 * @buffer: the user buffer
2129 * @lenp: the size of the user buffer
2130 * @ppos: file position
2131 *
2132 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2133 * values from/to the user buffer, treated as an ASCII string.
2134 *
2135 * Returns 0 on success.
2136 */
2137 int proc_dointvec(struct ctl_table *table, int write,
2138 void __user *buffer, size_t *lenp, loff_t *ppos)
2139 {
2140 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2141 NULL,NULL);
2142 }
2143
2144 /*
2145 * Taint values can only be increased
2146 * This means we can safely use a temporary.
2147 */
2148 static int proc_taint(struct ctl_table *table, int write,
2149 void __user *buffer, size_t *lenp, loff_t *ppos)
2150 {
2151 struct ctl_table t;
2152 unsigned long tmptaint = get_taint();
2153 int err;
2154
2155 if (write && !capable(CAP_SYS_ADMIN))
2156 return -EPERM;
2157
2158 t = *table;
2159 t.data = &tmptaint;
2160 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2161 if (err < 0)
2162 return err;
2163
2164 if (write) {
2165 /*
2166 * Poor man's atomic or. Not worth adding a primitive
2167 * to everyone's atomic.h for this
2168 */
2169 int i;
2170 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2171 if ((tmptaint >> i) & 1)
2172 add_taint(i, LOCKDEP_STILL_OK);
2173 }
2174 }
2175
2176 return err;
2177 }
2178
2179 #ifdef CONFIG_PRINTK
2180 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2181 void __user *buffer, size_t *lenp, loff_t *ppos)
2182 {
2183 if (write && !capable(CAP_SYS_ADMIN))
2184 return -EPERM;
2185
2186 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2187 }
2188 #endif
2189
2190 struct do_proc_dointvec_minmax_conv_param {
2191 int *min;
2192 int *max;
2193 };
2194
2195 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2196 int *valp,
2197 int write, void *data)
2198 {
2199 struct do_proc_dointvec_minmax_conv_param *param = data;
2200 if (write) {
2201 int val = *negp ? -*lvalp : *lvalp;
2202 if ((param->min && *param->min > val) ||
2203 (param->max && *param->max < val))
2204 return -EINVAL;
2205 *valp = val;
2206 } else {
2207 int val = *valp;
2208 if (val < 0) {
2209 *negp = true;
2210 *lvalp = (unsigned long)-val;
2211 } else {
2212 *negp = false;
2213 *lvalp = (unsigned long)val;
2214 }
2215 }
2216 return 0;
2217 }
2218
2219 /**
2220 * proc_dointvec_minmax - read a vector of integers with min/max values
2221 * @table: the sysctl table
2222 * @write: %TRUE if this is a write to the sysctl file
2223 * @buffer: the user buffer
2224 * @lenp: the size of the user buffer
2225 * @ppos: file position
2226 *
2227 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2228 * values from/to the user buffer, treated as an ASCII string.
2229 *
2230 * This routine will ensure the values are within the range specified by
2231 * table->extra1 (min) and table->extra2 (max).
2232 *
2233 * Returns 0 on success.
2234 */
2235 int proc_dointvec_minmax(struct ctl_table *table, int write,
2236 void __user *buffer, size_t *lenp, loff_t *ppos)
2237 {
2238 struct do_proc_dointvec_minmax_conv_param param = {
2239 .min = (int *) table->extra1,
2240 .max = (int *) table->extra2,
2241 };
2242 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2243 do_proc_dointvec_minmax_conv, &param);
2244 }
2245
2246 static void validate_coredump_safety(void)
2247 {
2248 #ifdef CONFIG_COREDUMP
2249 if (suid_dumpable == SUID_DUMP_ROOT &&
2250 core_pattern[0] != '/' && core_pattern[0] != '|') {
2251 printk(KERN_WARNING "Unsafe core_pattern used with "\
2252 "suid_dumpable=2. Pipe handler or fully qualified "\
2253 "core dump path required.\n");
2254 }
2255 #endif
2256 }
2257
2258 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2259 void __user *buffer, size_t *lenp, loff_t *ppos)
2260 {
2261 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2262 if (!error)
2263 validate_coredump_safety();
2264 return error;
2265 }
2266
2267 #ifdef CONFIG_COREDUMP
2268 static int proc_dostring_coredump(struct ctl_table *table, int write,
2269 void __user *buffer, size_t *lenp, loff_t *ppos)
2270 {
2271 int error = proc_dostring(table, write, buffer, lenp, ppos);
2272 if (!error)
2273 validate_coredump_safety();
2274 return error;
2275 }
2276 #endif
2277
2278 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2279 void __user *buffer,
2280 size_t *lenp, loff_t *ppos,
2281 unsigned long convmul,
2282 unsigned long convdiv)
2283 {
2284 unsigned long *i, *min, *max;
2285 int vleft, first = 1, err = 0;
2286 unsigned long page = 0;
2287 size_t left;
2288 char *kbuf;
2289
2290 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2291 *lenp = 0;
2292 return 0;
2293 }
2294
2295 i = (unsigned long *) data;
2296 min = (unsigned long *) table->extra1;
2297 max = (unsigned long *) table->extra2;
2298 vleft = table->maxlen / sizeof(unsigned long);
2299 left = *lenp;
2300
2301 if (write) {
2302 if (*ppos) {
2303 switch (sysctl_writes_strict) {
2304 case SYSCTL_WRITES_STRICT:
2305 goto out;
2306 case SYSCTL_WRITES_WARN:
2307 warn_sysctl_write(table);
2308 break;
2309 default:
2310 break;
2311 }
2312 }
2313
2314 if (left > PAGE_SIZE - 1)
2315 left = PAGE_SIZE - 1;
2316 page = __get_free_page(GFP_TEMPORARY);
2317 kbuf = (char *) page;
2318 if (!kbuf)
2319 return -ENOMEM;
2320 if (copy_from_user(kbuf, buffer, left)) {
2321 err = -EFAULT;
2322 goto free;
2323 }
2324 kbuf[left] = 0;
2325 }
2326
2327 for (; left && vleft--; i++, first = 0) {
2328 unsigned long val;
2329
2330 if (write) {
2331 bool neg;
2332
2333 left -= proc_skip_spaces(&kbuf);
2334
2335 err = proc_get_long(&kbuf, &left, &val, &neg,
2336 proc_wspace_sep,
2337 sizeof(proc_wspace_sep), NULL);
2338 if (err)
2339 break;
2340 if (neg)
2341 continue;
2342 if ((min && val < *min) || (max && val > *max))
2343 continue;
2344 *i = val;
2345 } else {
2346 val = convdiv * (*i) / convmul;
2347 if (!first) {
2348 err = proc_put_char(&buffer, &left, '\t');
2349 if (err)
2350 break;
2351 }
2352 err = proc_put_long(&buffer, &left, val, false);
2353 if (err)
2354 break;
2355 }
2356 }
2357
2358 if (!write && !first && left && !err)
2359 err = proc_put_char(&buffer, &left, '\n');
2360 if (write && !err)
2361 left -= proc_skip_spaces(&kbuf);
2362 free:
2363 if (write) {
2364 free_page(page);
2365 if (first)
2366 return err ? : -EINVAL;
2367 }
2368 *lenp -= left;
2369 out:
2370 *ppos += *lenp;
2371 return err;
2372 }
2373
2374 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2375 void __user *buffer,
2376 size_t *lenp, loff_t *ppos,
2377 unsigned long convmul,
2378 unsigned long convdiv)
2379 {
2380 return __do_proc_doulongvec_minmax(table->data, table, write,
2381 buffer, lenp, ppos, convmul, convdiv);
2382 }
2383
2384 /**
2385 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2386 * @table: the sysctl table
2387 * @write: %TRUE if this is a write to the sysctl file
2388 * @buffer: the user buffer
2389 * @lenp: the size of the user buffer
2390 * @ppos: file position
2391 *
2392 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2393 * values from/to the user buffer, treated as an ASCII string.
2394 *
2395 * This routine will ensure the values are within the range specified by
2396 * table->extra1 (min) and table->extra2 (max).
2397 *
2398 * Returns 0 on success.
2399 */
2400 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2401 void __user *buffer, size_t *lenp, loff_t *ppos)
2402 {
2403 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2404 }
2405
2406 /**
2407 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2408 * @table: the sysctl table
2409 * @write: %TRUE if this is a write to the sysctl file
2410 * @buffer: the user buffer
2411 * @lenp: the size of the user buffer
2412 * @ppos: file position
2413 *
2414 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2415 * values from/to the user buffer, treated as an ASCII string. The values
2416 * are treated as milliseconds, and converted to jiffies when they are stored.
2417 *
2418 * This routine will ensure the values are within the range specified by
2419 * table->extra1 (min) and table->extra2 (max).
2420 *
2421 * Returns 0 on success.
2422 */
2423 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2424 void __user *buffer,
2425 size_t *lenp, loff_t *ppos)
2426 {
2427 return do_proc_doulongvec_minmax(table, write, buffer,
2428 lenp, ppos, HZ, 1000l);
2429 }
2430
2431
2432 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2433 int *valp,
2434 int write, void *data)
2435 {
2436 if (write) {
2437 if (*lvalp > LONG_MAX / HZ)
2438 return 1;
2439 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
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 = lval / HZ;
2451 }
2452 return 0;
2453 }
2454
2455 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2456 int *valp,
2457 int write, void *data)
2458 {
2459 if (write) {
2460 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2461 return 1;
2462 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2463 } else {
2464 int val = *valp;
2465 unsigned long lval;
2466 if (val < 0) {
2467 *negp = true;
2468 lval = (unsigned long)-val;
2469 } else {
2470 *negp = false;
2471 lval = (unsigned long)val;
2472 }
2473 *lvalp = jiffies_to_clock_t(lval);
2474 }
2475 return 0;
2476 }
2477
2478 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2479 int *valp,
2480 int write, void *data)
2481 {
2482 if (write) {
2483 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2484
2485 if (jif > INT_MAX)
2486 return 1;
2487 *valp = (int)jif;
2488 } else {
2489 int val = *valp;
2490 unsigned long lval;
2491 if (val < 0) {
2492 *negp = true;
2493 lval = (unsigned long)-val;
2494 } else {
2495 *negp = false;
2496 lval = (unsigned long)val;
2497 }
2498 *lvalp = jiffies_to_msecs(lval);
2499 }
2500 return 0;
2501 }
2502
2503 /**
2504 * proc_dointvec_jiffies - read a vector of integers as seconds
2505 * @table: the sysctl table
2506 * @write: %TRUE if this is a write to the sysctl file
2507 * @buffer: the user buffer
2508 * @lenp: the size of the user buffer
2509 * @ppos: file position
2510 *
2511 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2512 * values from/to the user buffer, treated as an ASCII string.
2513 * The values read are assumed to be in seconds, and are converted into
2514 * jiffies.
2515 *
2516 * Returns 0 on success.
2517 */
2518 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2519 void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2522 do_proc_dointvec_jiffies_conv,NULL);
2523 }
2524
2525 /**
2526 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2527 * @table: the sysctl table
2528 * @write: %TRUE if this is a write to the sysctl file
2529 * @buffer: the user buffer
2530 * @lenp: the size of the user buffer
2531 * @ppos: pointer to the file position
2532 *
2533 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2534 * values from/to the user buffer, treated as an ASCII string.
2535 * The values read are assumed to be in 1/USER_HZ seconds, and
2536 * are converted into jiffies.
2537 *
2538 * Returns 0 on success.
2539 */
2540 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2541 void __user *buffer, size_t *lenp, loff_t *ppos)
2542 {
2543 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2544 do_proc_dointvec_userhz_jiffies_conv,NULL);
2545 }
2546
2547 /**
2548 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2549 * @table: the sysctl table
2550 * @write: %TRUE if this is a write to the sysctl file
2551 * @buffer: the user buffer
2552 * @lenp: the size of the user buffer
2553 * @ppos: file position
2554 * @ppos: the current position in the file
2555 *
2556 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2557 * values from/to the user buffer, treated as an ASCII string.
2558 * The values read are assumed to be in 1/1000 seconds, and
2559 * are converted into jiffies.
2560 *
2561 * Returns 0 on success.
2562 */
2563 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2564 void __user *buffer, size_t *lenp, loff_t *ppos)
2565 {
2566 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2567 do_proc_dointvec_ms_jiffies_conv, NULL);
2568 }
2569
2570 static int proc_do_cad_pid(struct ctl_table *table, int write,
2571 void __user *buffer, size_t *lenp, loff_t *ppos)
2572 {
2573 struct pid *new_pid;
2574 pid_t tmp;
2575 int r;
2576
2577 tmp = pid_vnr(cad_pid);
2578
2579 r = __do_proc_dointvec(&tmp, table, write, buffer,
2580 lenp, ppos, NULL, NULL);
2581 if (r || !write)
2582 return r;
2583
2584 new_pid = find_get_pid(tmp);
2585 if (!new_pid)
2586 return -ESRCH;
2587
2588 put_pid(xchg(&cad_pid, new_pid));
2589 return 0;
2590 }
2591
2592 /**
2593 * proc_do_large_bitmap - read/write from/to a large bitmap
2594 * @table: the sysctl table
2595 * @write: %TRUE if this is a write to the sysctl file
2596 * @buffer: the user buffer
2597 * @lenp: the size of the user buffer
2598 * @ppos: file position
2599 *
2600 * The bitmap is stored at table->data and the bitmap length (in bits)
2601 * in table->maxlen.
2602 *
2603 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2604 * large bitmaps may be represented in a compact manner. Writing into
2605 * the file will clear the bitmap then update it with the given input.
2606 *
2607 * Returns 0 on success.
2608 */
2609 int proc_do_large_bitmap(struct ctl_table *table, int write,
2610 void __user *buffer, size_t *lenp, loff_t *ppos)
2611 {
2612 int err = 0;
2613 bool first = 1;
2614 size_t left = *lenp;
2615 unsigned long bitmap_len = table->maxlen;
2616 unsigned long *bitmap = *(unsigned long **) table->data;
2617 unsigned long *tmp_bitmap = NULL;
2618 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2619
2620 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2621 *lenp = 0;
2622 return 0;
2623 }
2624
2625 if (write) {
2626 unsigned long page = 0;
2627 char *kbuf;
2628
2629 if (left > PAGE_SIZE - 1)
2630 left = PAGE_SIZE - 1;
2631
2632 page = __get_free_page(GFP_TEMPORARY);
2633 kbuf = (char *) page;
2634 if (!kbuf)
2635 return -ENOMEM;
2636 if (copy_from_user(kbuf, buffer, left)) {
2637 free_page(page);
2638 return -EFAULT;
2639 }
2640 kbuf[left] = 0;
2641
2642 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2643 GFP_KERNEL);
2644 if (!tmp_bitmap) {
2645 free_page(page);
2646 return -ENOMEM;
2647 }
2648 proc_skip_char(&kbuf, &left, '\n');
2649 while (!err && left) {
2650 unsigned long val_a, val_b;
2651 bool neg;
2652
2653 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2654 sizeof(tr_a), &c);
2655 if (err)
2656 break;
2657 if (val_a >= bitmap_len || neg) {
2658 err = -EINVAL;
2659 break;
2660 }
2661
2662 val_b = val_a;
2663 if (left) {
2664 kbuf++;
2665 left--;
2666 }
2667
2668 if (c == '-') {
2669 err = proc_get_long(&kbuf, &left, &val_b,
2670 &neg, tr_b, sizeof(tr_b),
2671 &c);
2672 if (err)
2673 break;
2674 if (val_b >= bitmap_len || neg ||
2675 val_a > val_b) {
2676 err = -EINVAL;
2677 break;
2678 }
2679 if (left) {
2680 kbuf++;
2681 left--;
2682 }
2683 }
2684
2685 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2686 first = 0;
2687 proc_skip_char(&kbuf, &left, '\n');
2688 }
2689 free_page(page);
2690 } else {
2691 unsigned long bit_a, bit_b = 0;
2692
2693 while (left) {
2694 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2695 if (bit_a >= bitmap_len)
2696 break;
2697 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2698 bit_a + 1) - 1;
2699
2700 if (!first) {
2701 err = proc_put_char(&buffer, &left, ',');
2702 if (err)
2703 break;
2704 }
2705 err = proc_put_long(&buffer, &left, bit_a, false);
2706 if (err)
2707 break;
2708 if (bit_a != bit_b) {
2709 err = proc_put_char(&buffer, &left, '-');
2710 if (err)
2711 break;
2712 err = proc_put_long(&buffer, &left, bit_b, false);
2713 if (err)
2714 break;
2715 }
2716
2717 first = 0; bit_b++;
2718 }
2719 if (!err)
2720 err = proc_put_char(&buffer, &left, '\n');
2721 }
2722
2723 if (!err) {
2724 if (write) {
2725 if (*ppos)
2726 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2727 else
2728 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2729 }
2730 kfree(tmp_bitmap);
2731 *lenp -= left;
2732 *ppos += *lenp;
2733 return 0;
2734 } else {
2735 kfree(tmp_bitmap);
2736 return err;
2737 }
2738 }
2739
2740 #else /* CONFIG_PROC_SYSCTL */
2741
2742 int proc_dostring(struct ctl_table *table, int write,
2743 void __user *buffer, size_t *lenp, loff_t *ppos)
2744 {
2745 return -ENOSYS;
2746 }
2747
2748 int proc_dointvec(struct ctl_table *table, int write,
2749 void __user *buffer, size_t *lenp, loff_t *ppos)
2750 {
2751 return -ENOSYS;
2752 }
2753
2754 int proc_dointvec_minmax(struct ctl_table *table, int write,
2755 void __user *buffer, size_t *lenp, loff_t *ppos)
2756 {
2757 return -ENOSYS;
2758 }
2759
2760 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2761 void __user *buffer, size_t *lenp, loff_t *ppos)
2762 {
2763 return -ENOSYS;
2764 }
2765
2766 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2767 void __user *buffer, size_t *lenp, loff_t *ppos)
2768 {
2769 return -ENOSYS;
2770 }
2771
2772 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2773 void __user *buffer, size_t *lenp, loff_t *ppos)
2774 {
2775 return -ENOSYS;
2776 }
2777
2778 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2779 void __user *buffer, size_t *lenp, loff_t *ppos)
2780 {
2781 return -ENOSYS;
2782 }
2783
2784 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2785 void __user *buffer,
2786 size_t *lenp, loff_t *ppos)
2787 {
2788 return -ENOSYS;
2789 }
2790
2791
2792 #endif /* CONFIG_PROC_SYSCTL */
2793
2794 /*
2795 * No sense putting this after each symbol definition, twice,
2796 * exception granted :-)
2797 */
2798 EXPORT_SYMBOL(proc_dointvec);
2799 EXPORT_SYMBOL(proc_dointvec_jiffies);
2800 EXPORT_SYMBOL(proc_dointvec_minmax);
2801 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2802 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2803 EXPORT_SYMBOL(proc_dostring);
2804 EXPORT_SYMBOL(proc_doulongvec_minmax);
2805 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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