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Merge tag 'pci-v4.1-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
[mirror_ubuntu-bionic-kernel.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/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 {
353 .procname = "timer_migration",
354 .data = &sysctl_timer_migration,
355 .maxlen = sizeof(unsigned int),
356 .mode = 0644,
357 .proc_handler = proc_dointvec_minmax,
358 .extra1 = &zero,
359 .extra2 = &one,
360 },
361 #endif /* CONFIG_SMP */
362 #ifdef CONFIG_NUMA_BALANCING
363 {
364 .procname = "numa_balancing_scan_delay_ms",
365 .data = &sysctl_numa_balancing_scan_delay,
366 .maxlen = sizeof(unsigned int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec,
369 },
370 {
371 .procname = "numa_balancing_scan_period_min_ms",
372 .data = &sysctl_numa_balancing_scan_period_min,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
377 {
378 .procname = "numa_balancing_scan_period_max_ms",
379 .data = &sysctl_numa_balancing_scan_period_max,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384 {
385 .procname = "numa_balancing_scan_size_mb",
386 .data = &sysctl_numa_balancing_scan_size,
387 .maxlen = sizeof(unsigned int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec_minmax,
390 .extra1 = &one,
391 },
392 {
393 .procname = "numa_balancing",
394 .data = NULL, /* filled in by handler */
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
397 .proc_handler = sysctl_numa_balancing,
398 .extra1 = &zero,
399 .extra2 = &one,
400 },
401 #endif /* CONFIG_NUMA_BALANCING */
402 #endif /* CONFIG_SCHED_DEBUG */
403 {
404 .procname = "sched_rt_period_us",
405 .data = &sysctl_sched_rt_period,
406 .maxlen = sizeof(unsigned int),
407 .mode = 0644,
408 .proc_handler = sched_rt_handler,
409 },
410 {
411 .procname = "sched_rt_runtime_us",
412 .data = &sysctl_sched_rt_runtime,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = sched_rt_handler,
416 },
417 {
418 .procname = "sched_rr_timeslice_ms",
419 .data = &sched_rr_timeslice,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = sched_rr_handler,
423 },
424 #ifdef CONFIG_SCHED_AUTOGROUP
425 {
426 .procname = "sched_autogroup_enabled",
427 .data = &sysctl_sched_autogroup_enabled,
428 .maxlen = sizeof(unsigned int),
429 .mode = 0644,
430 .proc_handler = proc_dointvec_minmax,
431 .extra1 = &zero,
432 .extra2 = &one,
433 },
434 #endif
435 #ifdef CONFIG_CFS_BANDWIDTH
436 {
437 .procname = "sched_cfs_bandwidth_slice_us",
438 .data = &sysctl_sched_cfs_bandwidth_slice,
439 .maxlen = sizeof(unsigned int),
440 .mode = 0644,
441 .proc_handler = proc_dointvec_minmax,
442 .extra1 = &one,
443 },
444 #endif
445 #ifdef CONFIG_PROVE_LOCKING
446 {
447 .procname = "prove_locking",
448 .data = &prove_locking,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec,
452 },
453 #endif
454 #ifdef CONFIG_LOCK_STAT
455 {
456 .procname = "lock_stat",
457 .data = &lock_stat,
458 .maxlen = sizeof(int),
459 .mode = 0644,
460 .proc_handler = proc_dointvec,
461 },
462 #endif
463 {
464 .procname = "panic",
465 .data = &panic_timeout,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec,
469 },
470 #ifdef CONFIG_COREDUMP
471 {
472 .procname = "core_uses_pid",
473 .data = &core_uses_pid,
474 .maxlen = sizeof(int),
475 .mode = 0644,
476 .proc_handler = proc_dointvec,
477 },
478 {
479 .procname = "core_pattern",
480 .data = core_pattern,
481 .maxlen = CORENAME_MAX_SIZE,
482 .mode = 0644,
483 .proc_handler = proc_dostring_coredump,
484 },
485 {
486 .procname = "core_pipe_limit",
487 .data = &core_pipe_limit,
488 .maxlen = sizeof(unsigned int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 #endif
493 #ifdef CONFIG_PROC_SYSCTL
494 {
495 .procname = "tainted",
496 .maxlen = sizeof(long),
497 .mode = 0644,
498 .proc_handler = proc_taint,
499 },
500 {
501 .procname = "sysctl_writes_strict",
502 .data = &sysctl_writes_strict,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec_minmax,
506 .extra1 = &neg_one,
507 .extra2 = &one,
508 },
509 #endif
510 #ifdef CONFIG_LATENCYTOP
511 {
512 .procname = "latencytop",
513 .data = &latencytop_enabled,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = proc_dointvec,
517 },
518 #endif
519 #ifdef CONFIG_BLK_DEV_INITRD
520 {
521 .procname = "real-root-dev",
522 .data = &real_root_dev,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec,
526 },
527 #endif
528 {
529 .procname = "print-fatal-signals",
530 .data = &print_fatal_signals,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec,
534 },
535 #ifdef CONFIG_SPARC
536 {
537 .procname = "reboot-cmd",
538 .data = reboot_command,
539 .maxlen = 256,
540 .mode = 0644,
541 .proc_handler = proc_dostring,
542 },
543 {
544 .procname = "stop-a",
545 .data = &stop_a_enabled,
546 .maxlen = sizeof (int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec,
549 },
550 {
551 .procname = "scons-poweroff",
552 .data = &scons_pwroff,
553 .maxlen = sizeof (int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec,
556 },
557 #endif
558 #ifdef CONFIG_SPARC64
559 {
560 .procname = "tsb-ratio",
561 .data = &sysctl_tsb_ratio,
562 .maxlen = sizeof (int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566 #endif
567 #ifdef __hppa__
568 {
569 .procname = "soft-power",
570 .data = &pwrsw_enabled,
571 .maxlen = sizeof (int),
572 .mode = 0644,
573 .proc_handler = proc_dointvec,
574 },
575 #endif
576 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
577 {
578 .procname = "unaligned-trap",
579 .data = &unaligned_enabled,
580 .maxlen = sizeof (int),
581 .mode = 0644,
582 .proc_handler = proc_dointvec,
583 },
584 #endif
585 {
586 .procname = "ctrl-alt-del",
587 .data = &C_A_D,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = proc_dointvec,
591 },
592 #ifdef CONFIG_FUNCTION_TRACER
593 {
594 .procname = "ftrace_enabled",
595 .data = &ftrace_enabled,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = ftrace_enable_sysctl,
599 },
600 #endif
601 #ifdef CONFIG_STACK_TRACER
602 {
603 .procname = "stack_tracer_enabled",
604 .data = &stack_tracer_enabled,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = stack_trace_sysctl,
608 },
609 #endif
610 #ifdef CONFIG_TRACING
611 {
612 .procname = "ftrace_dump_on_oops",
613 .data = &ftrace_dump_on_oops,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 .proc_handler = proc_dointvec,
617 },
618 {
619 .procname = "traceoff_on_warning",
620 .data = &__disable_trace_on_warning,
621 .maxlen = sizeof(__disable_trace_on_warning),
622 .mode = 0644,
623 .proc_handler = proc_dointvec,
624 },
625 {
626 .procname = "tracepoint_printk",
627 .data = &tracepoint_printk,
628 .maxlen = sizeof(tracepoint_printk),
629 .mode = 0644,
630 .proc_handler = proc_dointvec,
631 },
632 #endif
633 #ifdef CONFIG_KEXEC
634 {
635 .procname = "kexec_load_disabled",
636 .data = &kexec_load_disabled,
637 .maxlen = sizeof(int),
638 .mode = 0644,
639 /* only handle a transition from default "0" to "1" */
640 .proc_handler = proc_dointvec_minmax,
641 .extra1 = &one,
642 .extra2 = &one,
643 },
644 #endif
645 #ifdef CONFIG_MODULES
646 {
647 .procname = "modprobe",
648 .data = &modprobe_path,
649 .maxlen = KMOD_PATH_LEN,
650 .mode = 0644,
651 .proc_handler = proc_dostring,
652 },
653 {
654 .procname = "modules_disabled",
655 .data = &modules_disabled,
656 .maxlen = sizeof(int),
657 .mode = 0644,
658 /* only handle a transition from default "0" to "1" */
659 .proc_handler = proc_dointvec_minmax,
660 .extra1 = &one,
661 .extra2 = &one,
662 },
663 #endif
664 #ifdef CONFIG_UEVENT_HELPER
665 {
666 .procname = "hotplug",
667 .data = &uevent_helper,
668 .maxlen = UEVENT_HELPER_PATH_LEN,
669 .mode = 0644,
670 .proc_handler = proc_dostring,
671 },
672 #endif
673 #ifdef CONFIG_CHR_DEV_SG
674 {
675 .procname = "sg-big-buff",
676 .data = &sg_big_buff,
677 .maxlen = sizeof (int),
678 .mode = 0444,
679 .proc_handler = proc_dointvec,
680 },
681 #endif
682 #ifdef CONFIG_BSD_PROCESS_ACCT
683 {
684 .procname = "acct",
685 .data = &acct_parm,
686 .maxlen = 3*sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec,
689 },
690 #endif
691 #ifdef CONFIG_MAGIC_SYSRQ
692 {
693 .procname = "sysrq",
694 .data = &__sysrq_enabled,
695 .maxlen = sizeof (int),
696 .mode = 0644,
697 .proc_handler = sysrq_sysctl_handler,
698 },
699 #endif
700 #ifdef CONFIG_PROC_SYSCTL
701 {
702 .procname = "cad_pid",
703 .data = NULL,
704 .maxlen = sizeof (int),
705 .mode = 0600,
706 .proc_handler = proc_do_cad_pid,
707 },
708 #endif
709 {
710 .procname = "threads-max",
711 .data = NULL,
712 .maxlen = sizeof(int),
713 .mode = 0644,
714 .proc_handler = sysctl_max_threads,
715 },
716 {
717 .procname = "random",
718 .mode = 0555,
719 .child = random_table,
720 },
721 {
722 .procname = "usermodehelper",
723 .mode = 0555,
724 .child = usermodehelper_table,
725 },
726 {
727 .procname = "overflowuid",
728 .data = &overflowuid,
729 .maxlen = sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec_minmax,
732 .extra1 = &minolduid,
733 .extra2 = &maxolduid,
734 },
735 {
736 .procname = "overflowgid",
737 .data = &overflowgid,
738 .maxlen = sizeof(int),
739 .mode = 0644,
740 .proc_handler = proc_dointvec_minmax,
741 .extra1 = &minolduid,
742 .extra2 = &maxolduid,
743 },
744 #ifdef CONFIG_S390
745 #ifdef CONFIG_MATHEMU
746 {
747 .procname = "ieee_emulation_warnings",
748 .data = &sysctl_ieee_emulation_warnings,
749 .maxlen = sizeof(int),
750 .mode = 0644,
751 .proc_handler = proc_dointvec,
752 },
753 #endif
754 {
755 .procname = "userprocess_debug",
756 .data = &show_unhandled_signals,
757 .maxlen = sizeof(int),
758 .mode = 0644,
759 .proc_handler = proc_dointvec,
760 },
761 #endif
762 {
763 .procname = "pid_max",
764 .data = &pid_max,
765 .maxlen = sizeof (int),
766 .mode = 0644,
767 .proc_handler = proc_dointvec_minmax,
768 .extra1 = &pid_max_min,
769 .extra2 = &pid_max_max,
770 },
771 {
772 .procname = "panic_on_oops",
773 .data = &panic_on_oops,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec,
777 },
778 #if defined CONFIG_PRINTK
779 {
780 .procname = "printk",
781 .data = &console_loglevel,
782 .maxlen = 4*sizeof(int),
783 .mode = 0644,
784 .proc_handler = proc_dointvec,
785 },
786 {
787 .procname = "printk_ratelimit",
788 .data = &printk_ratelimit_state.interval,
789 .maxlen = sizeof(int),
790 .mode = 0644,
791 .proc_handler = proc_dointvec_jiffies,
792 },
793 {
794 .procname = "printk_ratelimit_burst",
795 .data = &printk_ratelimit_state.burst,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec,
799 },
800 {
801 .procname = "printk_delay",
802 .data = &printk_delay_msec,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec_minmax,
806 .extra1 = &zero,
807 .extra2 = &ten_thousand,
808 },
809 {
810 .procname = "dmesg_restrict",
811 .data = &dmesg_restrict,
812 .maxlen = sizeof(int),
813 .mode = 0644,
814 .proc_handler = proc_dointvec_minmax_sysadmin,
815 .extra1 = &zero,
816 .extra2 = &one,
817 },
818 {
819 .procname = "kptr_restrict",
820 .data = &kptr_restrict,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec_minmax_sysadmin,
824 .extra1 = &zero,
825 .extra2 = &two,
826 },
827 #endif
828 {
829 .procname = "ngroups_max",
830 .data = &ngroups_max,
831 .maxlen = sizeof (int),
832 .mode = 0444,
833 .proc_handler = proc_dointvec,
834 },
835 {
836 .procname = "cap_last_cap",
837 .data = (void *)&cap_last_cap,
838 .maxlen = sizeof(int),
839 .mode = 0444,
840 .proc_handler = proc_dointvec,
841 },
842 #if defined(CONFIG_LOCKUP_DETECTOR)
843 {
844 .procname = "watchdog",
845 .data = &watchdog_user_enabled,
846 .maxlen = sizeof (int),
847 .mode = 0644,
848 .proc_handler = proc_watchdog,
849 .extra1 = &zero,
850 .extra2 = &one,
851 },
852 {
853 .procname = "watchdog_thresh",
854 .data = &watchdog_thresh,
855 .maxlen = sizeof(int),
856 .mode = 0644,
857 .proc_handler = proc_watchdog_thresh,
858 .extra1 = &zero,
859 .extra2 = &sixty,
860 },
861 {
862 .procname = "nmi_watchdog",
863 .data = &nmi_watchdog_enabled,
864 .maxlen = sizeof (int),
865 .mode = 0644,
866 .proc_handler = proc_nmi_watchdog,
867 .extra1 = &zero,
868 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
869 .extra2 = &one,
870 #else
871 .extra2 = &zero,
872 #endif
873 },
874 {
875 .procname = "soft_watchdog",
876 .data = &soft_watchdog_enabled,
877 .maxlen = sizeof (int),
878 .mode = 0644,
879 .proc_handler = proc_soft_watchdog,
880 .extra1 = &zero,
881 .extra2 = &one,
882 },
883 {
884 .procname = "softlockup_panic",
885 .data = &softlockup_panic,
886 .maxlen = sizeof(int),
887 .mode = 0644,
888 .proc_handler = proc_dointvec_minmax,
889 .extra1 = &zero,
890 .extra2 = &one,
891 },
892 #ifdef CONFIG_SMP
893 {
894 .procname = "softlockup_all_cpu_backtrace",
895 .data = &sysctl_softlockup_all_cpu_backtrace,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec_minmax,
899 .extra1 = &zero,
900 .extra2 = &one,
901 },
902 #endif /* CONFIG_SMP */
903 #endif
904 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
905 {
906 .procname = "unknown_nmi_panic",
907 .data = &unknown_nmi_panic,
908 .maxlen = sizeof (int),
909 .mode = 0644,
910 .proc_handler = proc_dointvec,
911 },
912 #endif
913 #if defined(CONFIG_X86)
914 {
915 .procname = "panic_on_unrecovered_nmi",
916 .data = &panic_on_unrecovered_nmi,
917 .maxlen = sizeof(int),
918 .mode = 0644,
919 .proc_handler = proc_dointvec,
920 },
921 {
922 .procname = "panic_on_io_nmi",
923 .data = &panic_on_io_nmi,
924 .maxlen = sizeof(int),
925 .mode = 0644,
926 .proc_handler = proc_dointvec,
927 },
928 #ifdef CONFIG_DEBUG_STACKOVERFLOW
929 {
930 .procname = "panic_on_stackoverflow",
931 .data = &sysctl_panic_on_stackoverflow,
932 .maxlen = sizeof(int),
933 .mode = 0644,
934 .proc_handler = proc_dointvec,
935 },
936 #endif
937 {
938 .procname = "bootloader_type",
939 .data = &bootloader_type,
940 .maxlen = sizeof (int),
941 .mode = 0444,
942 .proc_handler = proc_dointvec,
943 },
944 {
945 .procname = "bootloader_version",
946 .data = &bootloader_version,
947 .maxlen = sizeof (int),
948 .mode = 0444,
949 .proc_handler = proc_dointvec,
950 },
951 {
952 .procname = "kstack_depth_to_print",
953 .data = &kstack_depth_to_print,
954 .maxlen = sizeof(int),
955 .mode = 0644,
956 .proc_handler = proc_dointvec,
957 },
958 {
959 .procname = "io_delay_type",
960 .data = &io_delay_type,
961 .maxlen = sizeof(int),
962 .mode = 0644,
963 .proc_handler = proc_dointvec,
964 },
965 #endif
966 #if defined(CONFIG_MMU)
967 {
968 .procname = "randomize_va_space",
969 .data = &randomize_va_space,
970 .maxlen = sizeof(int),
971 .mode = 0644,
972 .proc_handler = proc_dointvec,
973 },
974 #endif
975 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
976 {
977 .procname = "spin_retry",
978 .data = &spin_retry,
979 .maxlen = sizeof (int),
980 .mode = 0644,
981 .proc_handler = proc_dointvec,
982 },
983 #endif
984 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
985 {
986 .procname = "acpi_video_flags",
987 .data = &acpi_realmode_flags,
988 .maxlen = sizeof (unsigned long),
989 .mode = 0644,
990 .proc_handler = proc_doulongvec_minmax,
991 },
992 #endif
993 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
994 {
995 .procname = "ignore-unaligned-usertrap",
996 .data = &no_unaligned_warning,
997 .maxlen = sizeof (int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec,
1000 },
1001 #endif
1002 #ifdef CONFIG_IA64
1003 {
1004 .procname = "unaligned-dump-stack",
1005 .data = &unaligned_dump_stack,
1006 .maxlen = sizeof (int),
1007 .mode = 0644,
1008 .proc_handler = proc_dointvec,
1009 },
1010 #endif
1011 #ifdef CONFIG_DETECT_HUNG_TASK
1012 {
1013 .procname = "hung_task_panic",
1014 .data = &sysctl_hung_task_panic,
1015 .maxlen = sizeof(int),
1016 .mode = 0644,
1017 .proc_handler = proc_dointvec_minmax,
1018 .extra1 = &zero,
1019 .extra2 = &one,
1020 },
1021 {
1022 .procname = "hung_task_check_count",
1023 .data = &sysctl_hung_task_check_count,
1024 .maxlen = sizeof(int),
1025 .mode = 0644,
1026 .proc_handler = proc_dointvec_minmax,
1027 .extra1 = &zero,
1028 },
1029 {
1030 .procname = "hung_task_timeout_secs",
1031 .data = &sysctl_hung_task_timeout_secs,
1032 .maxlen = sizeof(unsigned long),
1033 .mode = 0644,
1034 .proc_handler = proc_dohung_task_timeout_secs,
1035 .extra2 = &hung_task_timeout_max,
1036 },
1037 {
1038 .procname = "hung_task_warnings",
1039 .data = &sysctl_hung_task_warnings,
1040 .maxlen = sizeof(int),
1041 .mode = 0644,
1042 .proc_handler = proc_dointvec_minmax,
1043 .extra1 = &neg_one,
1044 },
1045 #endif
1046 #ifdef CONFIG_COMPAT
1047 {
1048 .procname = "compat-log",
1049 .data = &compat_log,
1050 .maxlen = sizeof (int),
1051 .mode = 0644,
1052 .proc_handler = proc_dointvec,
1053 },
1054 #endif
1055 #ifdef CONFIG_RT_MUTEXES
1056 {
1057 .procname = "max_lock_depth",
1058 .data = &max_lock_depth,
1059 .maxlen = sizeof(int),
1060 .mode = 0644,
1061 .proc_handler = proc_dointvec,
1062 },
1063 #endif
1064 {
1065 .procname = "poweroff_cmd",
1066 .data = &poweroff_cmd,
1067 .maxlen = POWEROFF_CMD_PATH_LEN,
1068 .mode = 0644,
1069 .proc_handler = proc_dostring,
1070 },
1071 #ifdef CONFIG_KEYS
1072 {
1073 .procname = "keys",
1074 .mode = 0555,
1075 .child = key_sysctls,
1076 },
1077 #endif
1078 #ifdef CONFIG_PERF_EVENTS
1079 /*
1080 * User-space scripts rely on the existence of this file
1081 * as a feature check for perf_events being enabled.
1082 *
1083 * So it's an ABI, do not remove!
1084 */
1085 {
1086 .procname = "perf_event_paranoid",
1087 .data = &sysctl_perf_event_paranoid,
1088 .maxlen = sizeof(sysctl_perf_event_paranoid),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec,
1091 },
1092 {
1093 .procname = "perf_event_mlock_kb",
1094 .data = &sysctl_perf_event_mlock,
1095 .maxlen = sizeof(sysctl_perf_event_mlock),
1096 .mode = 0644,
1097 .proc_handler = proc_dointvec,
1098 },
1099 {
1100 .procname = "perf_event_max_sample_rate",
1101 .data = &sysctl_perf_event_sample_rate,
1102 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1103 .mode = 0644,
1104 .proc_handler = perf_proc_update_handler,
1105 .extra1 = &one,
1106 },
1107 {
1108 .procname = "perf_cpu_time_max_percent",
1109 .data = &sysctl_perf_cpu_time_max_percent,
1110 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1111 .mode = 0644,
1112 .proc_handler = perf_cpu_time_max_percent_handler,
1113 .extra1 = &zero,
1114 .extra2 = &one_hundred,
1115 },
1116 #endif
1117 #ifdef CONFIG_KMEMCHECK
1118 {
1119 .procname = "kmemcheck",
1120 .data = &kmemcheck_enabled,
1121 .maxlen = sizeof(int),
1122 .mode = 0644,
1123 .proc_handler = proc_dointvec,
1124 },
1125 #endif
1126 {
1127 .procname = "panic_on_warn",
1128 .data = &panic_on_warn,
1129 .maxlen = sizeof(int),
1130 .mode = 0644,
1131 .proc_handler = proc_dointvec_minmax,
1132 .extra1 = &zero,
1133 .extra2 = &one,
1134 },
1135 { }
1136 };
1137
1138 static struct ctl_table vm_table[] = {
1139 {
1140 .procname = "overcommit_memory",
1141 .data = &sysctl_overcommit_memory,
1142 .maxlen = sizeof(sysctl_overcommit_memory),
1143 .mode = 0644,
1144 .proc_handler = proc_dointvec_minmax,
1145 .extra1 = &zero,
1146 .extra2 = &two,
1147 },
1148 {
1149 .procname = "panic_on_oom",
1150 .data = &sysctl_panic_on_oom,
1151 .maxlen = sizeof(sysctl_panic_on_oom),
1152 .mode = 0644,
1153 .proc_handler = proc_dointvec_minmax,
1154 .extra1 = &zero,
1155 .extra2 = &two,
1156 },
1157 {
1158 .procname = "oom_kill_allocating_task",
1159 .data = &sysctl_oom_kill_allocating_task,
1160 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1161 .mode = 0644,
1162 .proc_handler = proc_dointvec,
1163 },
1164 {
1165 .procname = "oom_dump_tasks",
1166 .data = &sysctl_oom_dump_tasks,
1167 .maxlen = sizeof(sysctl_oom_dump_tasks),
1168 .mode = 0644,
1169 .proc_handler = proc_dointvec,
1170 },
1171 {
1172 .procname = "overcommit_ratio",
1173 .data = &sysctl_overcommit_ratio,
1174 .maxlen = sizeof(sysctl_overcommit_ratio),
1175 .mode = 0644,
1176 .proc_handler = overcommit_ratio_handler,
1177 },
1178 {
1179 .procname = "overcommit_kbytes",
1180 .data = &sysctl_overcommit_kbytes,
1181 .maxlen = sizeof(sysctl_overcommit_kbytes),
1182 .mode = 0644,
1183 .proc_handler = overcommit_kbytes_handler,
1184 },
1185 {
1186 .procname = "page-cluster",
1187 .data = &page_cluster,
1188 .maxlen = sizeof(int),
1189 .mode = 0644,
1190 .proc_handler = proc_dointvec_minmax,
1191 .extra1 = &zero,
1192 },
1193 {
1194 .procname = "dirty_background_ratio",
1195 .data = &dirty_background_ratio,
1196 .maxlen = sizeof(dirty_background_ratio),
1197 .mode = 0644,
1198 .proc_handler = dirty_background_ratio_handler,
1199 .extra1 = &zero,
1200 .extra2 = &one_hundred,
1201 },
1202 {
1203 .procname = "dirty_background_bytes",
1204 .data = &dirty_background_bytes,
1205 .maxlen = sizeof(dirty_background_bytes),
1206 .mode = 0644,
1207 .proc_handler = dirty_background_bytes_handler,
1208 .extra1 = &one_ul,
1209 },
1210 {
1211 .procname = "dirty_ratio",
1212 .data = &vm_dirty_ratio,
1213 .maxlen = sizeof(vm_dirty_ratio),
1214 .mode = 0644,
1215 .proc_handler = dirty_ratio_handler,
1216 .extra1 = &zero,
1217 .extra2 = &one_hundred,
1218 },
1219 {
1220 .procname = "dirty_bytes",
1221 .data = &vm_dirty_bytes,
1222 .maxlen = sizeof(vm_dirty_bytes),
1223 .mode = 0644,
1224 .proc_handler = dirty_bytes_handler,
1225 .extra1 = &dirty_bytes_min,
1226 },
1227 {
1228 .procname = "dirty_writeback_centisecs",
1229 .data = &dirty_writeback_interval,
1230 .maxlen = sizeof(dirty_writeback_interval),
1231 .mode = 0644,
1232 .proc_handler = dirty_writeback_centisecs_handler,
1233 },
1234 {
1235 .procname = "dirty_expire_centisecs",
1236 .data = &dirty_expire_interval,
1237 .maxlen = sizeof(dirty_expire_interval),
1238 .mode = 0644,
1239 .proc_handler = proc_dointvec_minmax,
1240 .extra1 = &zero,
1241 },
1242 {
1243 .procname = "dirtytime_expire_seconds",
1244 .data = &dirtytime_expire_interval,
1245 .maxlen = sizeof(dirty_expire_interval),
1246 .mode = 0644,
1247 .proc_handler = dirtytime_interval_handler,
1248 .extra1 = &zero,
1249 },
1250 {
1251 .procname = "nr_pdflush_threads",
1252 .mode = 0444 /* read-only */,
1253 .proc_handler = pdflush_proc_obsolete,
1254 },
1255 {
1256 .procname = "swappiness",
1257 .data = &vm_swappiness,
1258 .maxlen = sizeof(vm_swappiness),
1259 .mode = 0644,
1260 .proc_handler = proc_dointvec_minmax,
1261 .extra1 = &zero,
1262 .extra2 = &one_hundred,
1263 },
1264 #ifdef CONFIG_HUGETLB_PAGE
1265 {
1266 .procname = "nr_hugepages",
1267 .data = NULL,
1268 .maxlen = sizeof(unsigned long),
1269 .mode = 0644,
1270 .proc_handler = hugetlb_sysctl_handler,
1271 },
1272 #ifdef CONFIG_NUMA
1273 {
1274 .procname = "nr_hugepages_mempolicy",
1275 .data = NULL,
1276 .maxlen = sizeof(unsigned long),
1277 .mode = 0644,
1278 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1279 },
1280 #endif
1281 {
1282 .procname = "hugetlb_shm_group",
1283 .data = &sysctl_hugetlb_shm_group,
1284 .maxlen = sizeof(gid_t),
1285 .mode = 0644,
1286 .proc_handler = proc_dointvec,
1287 },
1288 {
1289 .procname = "hugepages_treat_as_movable",
1290 .data = &hugepages_treat_as_movable,
1291 .maxlen = sizeof(int),
1292 .mode = 0644,
1293 .proc_handler = proc_dointvec,
1294 },
1295 {
1296 .procname = "nr_overcommit_hugepages",
1297 .data = NULL,
1298 .maxlen = sizeof(unsigned long),
1299 .mode = 0644,
1300 .proc_handler = hugetlb_overcommit_handler,
1301 },
1302 #endif
1303 {
1304 .procname = "lowmem_reserve_ratio",
1305 .data = &sysctl_lowmem_reserve_ratio,
1306 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1307 .mode = 0644,
1308 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1309 },
1310 {
1311 .procname = "drop_caches",
1312 .data = &sysctl_drop_caches,
1313 .maxlen = sizeof(int),
1314 .mode = 0644,
1315 .proc_handler = drop_caches_sysctl_handler,
1316 .extra1 = &one,
1317 .extra2 = &four,
1318 },
1319 #ifdef CONFIG_COMPACTION
1320 {
1321 .procname = "compact_memory",
1322 .data = &sysctl_compact_memory,
1323 .maxlen = sizeof(int),
1324 .mode = 0200,
1325 .proc_handler = sysctl_compaction_handler,
1326 },
1327 {
1328 .procname = "extfrag_threshold",
1329 .data = &sysctl_extfrag_threshold,
1330 .maxlen = sizeof(int),
1331 .mode = 0644,
1332 .proc_handler = sysctl_extfrag_handler,
1333 .extra1 = &min_extfrag_threshold,
1334 .extra2 = &max_extfrag_threshold,
1335 },
1336 {
1337 .procname = "compact_unevictable_allowed",
1338 .data = &sysctl_compact_unevictable_allowed,
1339 .maxlen = sizeof(int),
1340 .mode = 0644,
1341 .proc_handler = proc_dointvec,
1342 .extra1 = &zero,
1343 .extra2 = &one,
1344 },
1345
1346 #endif /* CONFIG_COMPACTION */
1347 {
1348 .procname = "min_free_kbytes",
1349 .data = &min_free_kbytes,
1350 .maxlen = sizeof(min_free_kbytes),
1351 .mode = 0644,
1352 .proc_handler = min_free_kbytes_sysctl_handler,
1353 .extra1 = &zero,
1354 },
1355 {
1356 .procname = "percpu_pagelist_fraction",
1357 .data = &percpu_pagelist_fraction,
1358 .maxlen = sizeof(percpu_pagelist_fraction),
1359 .mode = 0644,
1360 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1361 .extra1 = &zero,
1362 },
1363 #ifdef CONFIG_MMU
1364 {
1365 .procname = "max_map_count",
1366 .data = &sysctl_max_map_count,
1367 .maxlen = sizeof(sysctl_max_map_count),
1368 .mode = 0644,
1369 .proc_handler = proc_dointvec_minmax,
1370 .extra1 = &zero,
1371 },
1372 #else
1373 {
1374 .procname = "nr_trim_pages",
1375 .data = &sysctl_nr_trim_pages,
1376 .maxlen = sizeof(sysctl_nr_trim_pages),
1377 .mode = 0644,
1378 .proc_handler = proc_dointvec_minmax,
1379 .extra1 = &zero,
1380 },
1381 #endif
1382 {
1383 .procname = "laptop_mode",
1384 .data = &laptop_mode,
1385 .maxlen = sizeof(laptop_mode),
1386 .mode = 0644,
1387 .proc_handler = proc_dointvec_jiffies,
1388 },
1389 {
1390 .procname = "block_dump",
1391 .data = &block_dump,
1392 .maxlen = sizeof(block_dump),
1393 .mode = 0644,
1394 .proc_handler = proc_dointvec,
1395 .extra1 = &zero,
1396 },
1397 {
1398 .procname = "vfs_cache_pressure",
1399 .data = &sysctl_vfs_cache_pressure,
1400 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1401 .mode = 0644,
1402 .proc_handler = proc_dointvec,
1403 .extra1 = &zero,
1404 },
1405 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1406 {
1407 .procname = "legacy_va_layout",
1408 .data = &sysctl_legacy_va_layout,
1409 .maxlen = sizeof(sysctl_legacy_va_layout),
1410 .mode = 0644,
1411 .proc_handler = proc_dointvec,
1412 .extra1 = &zero,
1413 },
1414 #endif
1415 #ifdef CONFIG_NUMA
1416 {
1417 .procname = "zone_reclaim_mode",
1418 .data = &zone_reclaim_mode,
1419 .maxlen = sizeof(zone_reclaim_mode),
1420 .mode = 0644,
1421 .proc_handler = proc_dointvec,
1422 .extra1 = &zero,
1423 },
1424 {
1425 .procname = "min_unmapped_ratio",
1426 .data = &sysctl_min_unmapped_ratio,
1427 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1428 .mode = 0644,
1429 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1430 .extra1 = &zero,
1431 .extra2 = &one_hundred,
1432 },
1433 {
1434 .procname = "min_slab_ratio",
1435 .data = &sysctl_min_slab_ratio,
1436 .maxlen = sizeof(sysctl_min_slab_ratio),
1437 .mode = 0644,
1438 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1439 .extra1 = &zero,
1440 .extra2 = &one_hundred,
1441 },
1442 #endif
1443 #ifdef CONFIG_SMP
1444 {
1445 .procname = "stat_interval",
1446 .data = &sysctl_stat_interval,
1447 .maxlen = sizeof(sysctl_stat_interval),
1448 .mode = 0644,
1449 .proc_handler = proc_dointvec_jiffies,
1450 },
1451 #endif
1452 #ifdef CONFIG_MMU
1453 {
1454 .procname = "mmap_min_addr",
1455 .data = &dac_mmap_min_addr,
1456 .maxlen = sizeof(unsigned long),
1457 .mode = 0644,
1458 .proc_handler = mmap_min_addr_handler,
1459 },
1460 #endif
1461 #ifdef CONFIG_NUMA
1462 {
1463 .procname = "numa_zonelist_order",
1464 .data = &numa_zonelist_order,
1465 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1466 .mode = 0644,
1467 .proc_handler = numa_zonelist_order_handler,
1468 },
1469 #endif
1470 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1471 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1472 {
1473 .procname = "vdso_enabled",
1474 #ifdef CONFIG_X86_32
1475 .data = &vdso32_enabled,
1476 .maxlen = sizeof(vdso32_enabled),
1477 #else
1478 .data = &vdso_enabled,
1479 .maxlen = sizeof(vdso_enabled),
1480 #endif
1481 .mode = 0644,
1482 .proc_handler = proc_dointvec,
1483 .extra1 = &zero,
1484 },
1485 #endif
1486 #ifdef CONFIG_HIGHMEM
1487 {
1488 .procname = "highmem_is_dirtyable",
1489 .data = &vm_highmem_is_dirtyable,
1490 .maxlen = sizeof(vm_highmem_is_dirtyable),
1491 .mode = 0644,
1492 .proc_handler = proc_dointvec_minmax,
1493 .extra1 = &zero,
1494 .extra2 = &one,
1495 },
1496 #endif
1497 #ifdef CONFIG_MEMORY_FAILURE
1498 {
1499 .procname = "memory_failure_early_kill",
1500 .data = &sysctl_memory_failure_early_kill,
1501 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1502 .mode = 0644,
1503 .proc_handler = proc_dointvec_minmax,
1504 .extra1 = &zero,
1505 .extra2 = &one,
1506 },
1507 {
1508 .procname = "memory_failure_recovery",
1509 .data = &sysctl_memory_failure_recovery,
1510 .maxlen = sizeof(sysctl_memory_failure_recovery),
1511 .mode = 0644,
1512 .proc_handler = proc_dointvec_minmax,
1513 .extra1 = &zero,
1514 .extra2 = &one,
1515 },
1516 #endif
1517 {
1518 .procname = "user_reserve_kbytes",
1519 .data = &sysctl_user_reserve_kbytes,
1520 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1521 .mode = 0644,
1522 .proc_handler = proc_doulongvec_minmax,
1523 },
1524 {
1525 .procname = "admin_reserve_kbytes",
1526 .data = &sysctl_admin_reserve_kbytes,
1527 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1528 .mode = 0644,
1529 .proc_handler = proc_doulongvec_minmax,
1530 },
1531 { }
1532 };
1533
1534 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1535 static struct ctl_table binfmt_misc_table[] = {
1536 { }
1537 };
1538 #endif
1539
1540 static struct ctl_table fs_table[] = {
1541 {
1542 .procname = "inode-nr",
1543 .data = &inodes_stat,
1544 .maxlen = 2*sizeof(long),
1545 .mode = 0444,
1546 .proc_handler = proc_nr_inodes,
1547 },
1548 {
1549 .procname = "inode-state",
1550 .data = &inodes_stat,
1551 .maxlen = 7*sizeof(long),
1552 .mode = 0444,
1553 .proc_handler = proc_nr_inodes,
1554 },
1555 {
1556 .procname = "file-nr",
1557 .data = &files_stat,
1558 .maxlen = sizeof(files_stat),
1559 .mode = 0444,
1560 .proc_handler = proc_nr_files,
1561 },
1562 {
1563 .procname = "file-max",
1564 .data = &files_stat.max_files,
1565 .maxlen = sizeof(files_stat.max_files),
1566 .mode = 0644,
1567 .proc_handler = proc_doulongvec_minmax,
1568 },
1569 {
1570 .procname = "nr_open",
1571 .data = &sysctl_nr_open,
1572 .maxlen = sizeof(int),
1573 .mode = 0644,
1574 .proc_handler = proc_dointvec_minmax,
1575 .extra1 = &sysctl_nr_open_min,
1576 .extra2 = &sysctl_nr_open_max,
1577 },
1578 {
1579 .procname = "dentry-state",
1580 .data = &dentry_stat,
1581 .maxlen = 6*sizeof(long),
1582 .mode = 0444,
1583 .proc_handler = proc_nr_dentry,
1584 },
1585 {
1586 .procname = "overflowuid",
1587 .data = &fs_overflowuid,
1588 .maxlen = sizeof(int),
1589 .mode = 0644,
1590 .proc_handler = proc_dointvec_minmax,
1591 .extra1 = &minolduid,
1592 .extra2 = &maxolduid,
1593 },
1594 {
1595 .procname = "overflowgid",
1596 .data = &fs_overflowgid,
1597 .maxlen = sizeof(int),
1598 .mode = 0644,
1599 .proc_handler = proc_dointvec_minmax,
1600 .extra1 = &minolduid,
1601 .extra2 = &maxolduid,
1602 },
1603 #ifdef CONFIG_FILE_LOCKING
1604 {
1605 .procname = "leases-enable",
1606 .data = &leases_enable,
1607 .maxlen = sizeof(int),
1608 .mode = 0644,
1609 .proc_handler = proc_dointvec,
1610 },
1611 #endif
1612 #ifdef CONFIG_DNOTIFY
1613 {
1614 .procname = "dir-notify-enable",
1615 .data = &dir_notify_enable,
1616 .maxlen = sizeof(int),
1617 .mode = 0644,
1618 .proc_handler = proc_dointvec,
1619 },
1620 #endif
1621 #ifdef CONFIG_MMU
1622 #ifdef CONFIG_FILE_LOCKING
1623 {
1624 .procname = "lease-break-time",
1625 .data = &lease_break_time,
1626 .maxlen = sizeof(int),
1627 .mode = 0644,
1628 .proc_handler = proc_dointvec,
1629 },
1630 #endif
1631 #ifdef CONFIG_AIO
1632 {
1633 .procname = "aio-nr",
1634 .data = &aio_nr,
1635 .maxlen = sizeof(aio_nr),
1636 .mode = 0444,
1637 .proc_handler = proc_doulongvec_minmax,
1638 },
1639 {
1640 .procname = "aio-max-nr",
1641 .data = &aio_max_nr,
1642 .maxlen = sizeof(aio_max_nr),
1643 .mode = 0644,
1644 .proc_handler = proc_doulongvec_minmax,
1645 },
1646 #endif /* CONFIG_AIO */
1647 #ifdef CONFIG_INOTIFY_USER
1648 {
1649 .procname = "inotify",
1650 .mode = 0555,
1651 .child = inotify_table,
1652 },
1653 #endif
1654 #ifdef CONFIG_EPOLL
1655 {
1656 .procname = "epoll",
1657 .mode = 0555,
1658 .child = epoll_table,
1659 },
1660 #endif
1661 #endif
1662 {
1663 .procname = "protected_symlinks",
1664 .data = &sysctl_protected_symlinks,
1665 .maxlen = sizeof(int),
1666 .mode = 0600,
1667 .proc_handler = proc_dointvec_minmax,
1668 .extra1 = &zero,
1669 .extra2 = &one,
1670 },
1671 {
1672 .procname = "protected_hardlinks",
1673 .data = &sysctl_protected_hardlinks,
1674 .maxlen = sizeof(int),
1675 .mode = 0600,
1676 .proc_handler = proc_dointvec_minmax,
1677 .extra1 = &zero,
1678 .extra2 = &one,
1679 },
1680 {
1681 .procname = "suid_dumpable",
1682 .data = &suid_dumpable,
1683 .maxlen = sizeof(int),
1684 .mode = 0644,
1685 .proc_handler = proc_dointvec_minmax_coredump,
1686 .extra1 = &zero,
1687 .extra2 = &two,
1688 },
1689 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1690 {
1691 .procname = "binfmt_misc",
1692 .mode = 0555,
1693 .child = binfmt_misc_table,
1694 },
1695 #endif
1696 {
1697 .procname = "pipe-max-size",
1698 .data = &pipe_max_size,
1699 .maxlen = sizeof(int),
1700 .mode = 0644,
1701 .proc_handler = &pipe_proc_fn,
1702 .extra1 = &pipe_min_size,
1703 },
1704 { }
1705 };
1706
1707 static struct ctl_table debug_table[] = {
1708 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1709 {
1710 .procname = "exception-trace",
1711 .data = &show_unhandled_signals,
1712 .maxlen = sizeof(int),
1713 .mode = 0644,
1714 .proc_handler = proc_dointvec
1715 },
1716 #endif
1717 #if defined(CONFIG_OPTPROBES)
1718 {
1719 .procname = "kprobes-optimization",
1720 .data = &sysctl_kprobes_optimization,
1721 .maxlen = sizeof(int),
1722 .mode = 0644,
1723 .proc_handler = proc_kprobes_optimization_handler,
1724 .extra1 = &zero,
1725 .extra2 = &one,
1726 },
1727 #endif
1728 { }
1729 };
1730
1731 static struct ctl_table dev_table[] = {
1732 { }
1733 };
1734
1735 int __init sysctl_init(void)
1736 {
1737 struct ctl_table_header *hdr;
1738
1739 hdr = register_sysctl_table(sysctl_base_table);
1740 kmemleak_not_leak(hdr);
1741 return 0;
1742 }
1743
1744 #endif /* CONFIG_SYSCTL */
1745
1746 /*
1747 * /proc/sys support
1748 */
1749
1750 #ifdef CONFIG_PROC_SYSCTL
1751
1752 static int _proc_do_string(char *data, int maxlen, int write,
1753 char __user *buffer,
1754 size_t *lenp, loff_t *ppos)
1755 {
1756 size_t len;
1757 char __user *p;
1758 char c;
1759
1760 if (!data || !maxlen || !*lenp) {
1761 *lenp = 0;
1762 return 0;
1763 }
1764
1765 if (write) {
1766 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1767 /* Only continue writes not past the end of buffer. */
1768 len = strlen(data);
1769 if (len > maxlen - 1)
1770 len = maxlen - 1;
1771
1772 if (*ppos > len)
1773 return 0;
1774 len = *ppos;
1775 } else {
1776 /* Start writing from beginning of buffer. */
1777 len = 0;
1778 }
1779
1780 *ppos += *lenp;
1781 p = buffer;
1782 while ((p - buffer) < *lenp && len < maxlen - 1) {
1783 if (get_user(c, p++))
1784 return -EFAULT;
1785 if (c == 0 || c == '\n')
1786 break;
1787 data[len++] = c;
1788 }
1789 data[len] = 0;
1790 } else {
1791 len = strlen(data);
1792 if (len > maxlen)
1793 len = maxlen;
1794
1795 if (*ppos > len) {
1796 *lenp = 0;
1797 return 0;
1798 }
1799
1800 data += *ppos;
1801 len -= *ppos;
1802
1803 if (len > *lenp)
1804 len = *lenp;
1805 if (len)
1806 if (copy_to_user(buffer, data, len))
1807 return -EFAULT;
1808 if (len < *lenp) {
1809 if (put_user('\n', buffer + len))
1810 return -EFAULT;
1811 len++;
1812 }
1813 *lenp = len;
1814 *ppos += len;
1815 }
1816 return 0;
1817 }
1818
1819 static void warn_sysctl_write(struct ctl_table *table)
1820 {
1821 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1822 "This will not be supported in the future. To silence this\n"
1823 "warning, set kernel.sysctl_writes_strict = -1\n",
1824 current->comm, table->procname);
1825 }
1826
1827 /**
1828 * proc_dostring - read a string sysctl
1829 * @table: the sysctl table
1830 * @write: %TRUE if this is a write to the sysctl file
1831 * @buffer: the user buffer
1832 * @lenp: the size of the user buffer
1833 * @ppos: file position
1834 *
1835 * Reads/writes a string from/to the user buffer. If the kernel
1836 * buffer provided is not large enough to hold the string, the
1837 * string is truncated. The copied string is %NULL-terminated.
1838 * If the string is being read by the user process, it is copied
1839 * and a newline '\n' is added. It is truncated if the buffer is
1840 * not large enough.
1841 *
1842 * Returns 0 on success.
1843 */
1844 int proc_dostring(struct ctl_table *table, int write,
1845 void __user *buffer, size_t *lenp, loff_t *ppos)
1846 {
1847 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1848 warn_sysctl_write(table);
1849
1850 return _proc_do_string((char *)(table->data), table->maxlen, write,
1851 (char __user *)buffer, lenp, ppos);
1852 }
1853
1854 static size_t proc_skip_spaces(char **buf)
1855 {
1856 size_t ret;
1857 char *tmp = skip_spaces(*buf);
1858 ret = tmp - *buf;
1859 *buf = tmp;
1860 return ret;
1861 }
1862
1863 static void proc_skip_char(char **buf, size_t *size, const char v)
1864 {
1865 while (*size) {
1866 if (**buf != v)
1867 break;
1868 (*size)--;
1869 (*buf)++;
1870 }
1871 }
1872
1873 #define TMPBUFLEN 22
1874 /**
1875 * proc_get_long - reads an ASCII formatted integer from a user buffer
1876 *
1877 * @buf: a kernel buffer
1878 * @size: size of the kernel buffer
1879 * @val: this is where the number will be stored
1880 * @neg: set to %TRUE if number is negative
1881 * @perm_tr: a vector which contains the allowed trailers
1882 * @perm_tr_len: size of the perm_tr vector
1883 * @tr: pointer to store the trailer character
1884 *
1885 * In case of success %0 is returned and @buf and @size are updated with
1886 * the amount of bytes read. If @tr is non-NULL and a trailing
1887 * character exists (size is non-zero after returning from this
1888 * function), @tr is updated with the trailing character.
1889 */
1890 static int proc_get_long(char **buf, size_t *size,
1891 unsigned long *val, bool *neg,
1892 const char *perm_tr, unsigned perm_tr_len, char *tr)
1893 {
1894 int len;
1895 char *p, tmp[TMPBUFLEN];
1896
1897 if (!*size)
1898 return -EINVAL;
1899
1900 len = *size;
1901 if (len > TMPBUFLEN - 1)
1902 len = TMPBUFLEN - 1;
1903
1904 memcpy(tmp, *buf, len);
1905
1906 tmp[len] = 0;
1907 p = tmp;
1908 if (*p == '-' && *size > 1) {
1909 *neg = true;
1910 p++;
1911 } else
1912 *neg = false;
1913 if (!isdigit(*p))
1914 return -EINVAL;
1915
1916 *val = simple_strtoul(p, &p, 0);
1917
1918 len = p - tmp;
1919
1920 /* We don't know if the next char is whitespace thus we may accept
1921 * invalid integers (e.g. 1234...a) or two integers instead of one
1922 * (e.g. 123...1). So lets not allow such large numbers. */
1923 if (len == TMPBUFLEN - 1)
1924 return -EINVAL;
1925
1926 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1927 return -EINVAL;
1928
1929 if (tr && (len < *size))
1930 *tr = *p;
1931
1932 *buf += len;
1933 *size -= len;
1934
1935 return 0;
1936 }
1937
1938 /**
1939 * proc_put_long - converts an integer to a decimal ASCII formatted string
1940 *
1941 * @buf: the user buffer
1942 * @size: the size of the user buffer
1943 * @val: the integer to be converted
1944 * @neg: sign of the number, %TRUE for negative
1945 *
1946 * In case of success %0 is returned and @buf and @size are updated with
1947 * the amount of bytes written.
1948 */
1949 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1950 bool neg)
1951 {
1952 int len;
1953 char tmp[TMPBUFLEN], *p = tmp;
1954
1955 sprintf(p, "%s%lu", neg ? "-" : "", val);
1956 len = strlen(tmp);
1957 if (len > *size)
1958 len = *size;
1959 if (copy_to_user(*buf, tmp, len))
1960 return -EFAULT;
1961 *size -= len;
1962 *buf += len;
1963 return 0;
1964 }
1965 #undef TMPBUFLEN
1966
1967 static int proc_put_char(void __user **buf, size_t *size, char c)
1968 {
1969 if (*size) {
1970 char __user **buffer = (char __user **)buf;
1971 if (put_user(c, *buffer))
1972 return -EFAULT;
1973 (*size)--, (*buffer)++;
1974 *buf = *buffer;
1975 }
1976 return 0;
1977 }
1978
1979 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1980 int *valp,
1981 int write, void *data)
1982 {
1983 if (write) {
1984 if (*negp) {
1985 if (*lvalp > (unsigned long) INT_MAX + 1)
1986 return -EINVAL;
1987 *valp = -*lvalp;
1988 } else {
1989 if (*lvalp > (unsigned long) INT_MAX)
1990 return -EINVAL;
1991 *valp = *lvalp;
1992 }
1993 } else {
1994 int val = *valp;
1995 if (val < 0) {
1996 *negp = true;
1997 *lvalp = (unsigned long)-val;
1998 } else {
1999 *negp = false;
2000 *lvalp = (unsigned long)val;
2001 }
2002 }
2003 return 0;
2004 }
2005
2006 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2007
2008 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2009 int write, void __user *buffer,
2010 size_t *lenp, loff_t *ppos,
2011 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2012 int write, void *data),
2013 void *data)
2014 {
2015 int *i, vleft, first = 1, err = 0;
2016 unsigned long page = 0;
2017 size_t left;
2018 char *kbuf;
2019
2020 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2021 *lenp = 0;
2022 return 0;
2023 }
2024
2025 i = (int *) tbl_data;
2026 vleft = table->maxlen / sizeof(*i);
2027 left = *lenp;
2028
2029 if (!conv)
2030 conv = do_proc_dointvec_conv;
2031
2032 if (write) {
2033 if (*ppos) {
2034 switch (sysctl_writes_strict) {
2035 case SYSCTL_WRITES_STRICT:
2036 goto out;
2037 case SYSCTL_WRITES_WARN:
2038 warn_sysctl_write(table);
2039 break;
2040 default:
2041 break;
2042 }
2043 }
2044
2045 if (left > PAGE_SIZE - 1)
2046 left = PAGE_SIZE - 1;
2047 page = __get_free_page(GFP_TEMPORARY);
2048 kbuf = (char *) page;
2049 if (!kbuf)
2050 return -ENOMEM;
2051 if (copy_from_user(kbuf, buffer, left)) {
2052 err = -EFAULT;
2053 goto free;
2054 }
2055 kbuf[left] = 0;
2056 }
2057
2058 for (; left && vleft--; i++, first=0) {
2059 unsigned long lval;
2060 bool neg;
2061
2062 if (write) {
2063 left -= proc_skip_spaces(&kbuf);
2064
2065 if (!left)
2066 break;
2067 err = proc_get_long(&kbuf, &left, &lval, &neg,
2068 proc_wspace_sep,
2069 sizeof(proc_wspace_sep), NULL);
2070 if (err)
2071 break;
2072 if (conv(&neg, &lval, i, 1, data)) {
2073 err = -EINVAL;
2074 break;
2075 }
2076 } else {
2077 if (conv(&neg, &lval, i, 0, data)) {
2078 err = -EINVAL;
2079 break;
2080 }
2081 if (!first)
2082 err = proc_put_char(&buffer, &left, '\t');
2083 if (err)
2084 break;
2085 err = proc_put_long(&buffer, &left, lval, neg);
2086 if (err)
2087 break;
2088 }
2089 }
2090
2091 if (!write && !first && left && !err)
2092 err = proc_put_char(&buffer, &left, '\n');
2093 if (write && !err && left)
2094 left -= proc_skip_spaces(&kbuf);
2095 free:
2096 if (write) {
2097 free_page(page);
2098 if (first)
2099 return err ? : -EINVAL;
2100 }
2101 *lenp -= left;
2102 out:
2103 *ppos += *lenp;
2104 return err;
2105 }
2106
2107 static int do_proc_dointvec(struct ctl_table *table, int write,
2108 void __user *buffer, size_t *lenp, loff_t *ppos,
2109 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2110 int write, void *data),
2111 void *data)
2112 {
2113 return __do_proc_dointvec(table->data, table, write,
2114 buffer, lenp, ppos, conv, data);
2115 }
2116
2117 /**
2118 * proc_dointvec - read a vector of integers
2119 * @table: the sysctl table
2120 * @write: %TRUE if this is a write to the sysctl file
2121 * @buffer: the user buffer
2122 * @lenp: the size of the user buffer
2123 * @ppos: file position
2124 *
2125 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2126 * values from/to the user buffer, treated as an ASCII string.
2127 *
2128 * Returns 0 on success.
2129 */
2130 int proc_dointvec(struct ctl_table *table, int write,
2131 void __user *buffer, size_t *lenp, loff_t *ppos)
2132 {
2133 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2134 NULL,NULL);
2135 }
2136
2137 /*
2138 * Taint values can only be increased
2139 * This means we can safely use a temporary.
2140 */
2141 static int proc_taint(struct ctl_table *table, int write,
2142 void __user *buffer, size_t *lenp, loff_t *ppos)
2143 {
2144 struct ctl_table t;
2145 unsigned long tmptaint = get_taint();
2146 int err;
2147
2148 if (write && !capable(CAP_SYS_ADMIN))
2149 return -EPERM;
2150
2151 t = *table;
2152 t.data = &tmptaint;
2153 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2154 if (err < 0)
2155 return err;
2156
2157 if (write) {
2158 /*
2159 * Poor man's atomic or. Not worth adding a primitive
2160 * to everyone's atomic.h for this
2161 */
2162 int i;
2163 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2164 if ((tmptaint >> i) & 1)
2165 add_taint(i, LOCKDEP_STILL_OK);
2166 }
2167 }
2168
2169 return err;
2170 }
2171
2172 #ifdef CONFIG_PRINTK
2173 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2174 void __user *buffer, size_t *lenp, loff_t *ppos)
2175 {
2176 if (write && !capable(CAP_SYS_ADMIN))
2177 return -EPERM;
2178
2179 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2180 }
2181 #endif
2182
2183 struct do_proc_dointvec_minmax_conv_param {
2184 int *min;
2185 int *max;
2186 };
2187
2188 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2189 int *valp,
2190 int write, void *data)
2191 {
2192 struct do_proc_dointvec_minmax_conv_param *param = data;
2193 if (write) {
2194 int val = *negp ? -*lvalp : *lvalp;
2195 if ((param->min && *param->min > val) ||
2196 (param->max && *param->max < val))
2197 return -EINVAL;
2198 *valp = val;
2199 } else {
2200 int val = *valp;
2201 if (val < 0) {
2202 *negp = true;
2203 *lvalp = (unsigned long)-val;
2204 } else {
2205 *negp = false;
2206 *lvalp = (unsigned long)val;
2207 }
2208 }
2209 return 0;
2210 }
2211
2212 /**
2213 * proc_dointvec_minmax - read a vector of integers with min/max values
2214 * @table: the sysctl table
2215 * @write: %TRUE if this is a write to the sysctl file
2216 * @buffer: the user buffer
2217 * @lenp: the size of the user buffer
2218 * @ppos: file position
2219 *
2220 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2221 * values from/to the user buffer, treated as an ASCII string.
2222 *
2223 * This routine will ensure the values are within the range specified by
2224 * table->extra1 (min) and table->extra2 (max).
2225 *
2226 * Returns 0 on success.
2227 */
2228 int proc_dointvec_minmax(struct ctl_table *table, int write,
2229 void __user *buffer, size_t *lenp, loff_t *ppos)
2230 {
2231 struct do_proc_dointvec_minmax_conv_param param = {
2232 .min = (int *) table->extra1,
2233 .max = (int *) table->extra2,
2234 };
2235 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2236 do_proc_dointvec_minmax_conv, &param);
2237 }
2238
2239 static void validate_coredump_safety(void)
2240 {
2241 #ifdef CONFIG_COREDUMP
2242 if (suid_dumpable == SUID_DUMP_ROOT &&
2243 core_pattern[0] != '/' && core_pattern[0] != '|') {
2244 printk(KERN_WARNING "Unsafe core_pattern used with "\
2245 "suid_dumpable=2. Pipe handler or fully qualified "\
2246 "core dump path required.\n");
2247 }
2248 #endif
2249 }
2250
2251 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2252 void __user *buffer, size_t *lenp, loff_t *ppos)
2253 {
2254 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2255 if (!error)
2256 validate_coredump_safety();
2257 return error;
2258 }
2259
2260 #ifdef CONFIG_COREDUMP
2261 static int proc_dostring_coredump(struct ctl_table *table, int write,
2262 void __user *buffer, size_t *lenp, loff_t *ppos)
2263 {
2264 int error = proc_dostring(table, write, buffer, lenp, ppos);
2265 if (!error)
2266 validate_coredump_safety();
2267 return error;
2268 }
2269 #endif
2270
2271 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2272 void __user *buffer,
2273 size_t *lenp, loff_t *ppos,
2274 unsigned long convmul,
2275 unsigned long convdiv)
2276 {
2277 unsigned long *i, *min, *max;
2278 int vleft, first = 1, err = 0;
2279 unsigned long page = 0;
2280 size_t left;
2281 char *kbuf;
2282
2283 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2284 *lenp = 0;
2285 return 0;
2286 }
2287
2288 i = (unsigned long *) data;
2289 min = (unsigned long *) table->extra1;
2290 max = (unsigned long *) table->extra2;
2291 vleft = table->maxlen / sizeof(unsigned long);
2292 left = *lenp;
2293
2294 if (write) {
2295 if (*ppos) {
2296 switch (sysctl_writes_strict) {
2297 case SYSCTL_WRITES_STRICT:
2298 goto out;
2299 case SYSCTL_WRITES_WARN:
2300 warn_sysctl_write(table);
2301 break;
2302 default:
2303 break;
2304 }
2305 }
2306
2307 if (left > PAGE_SIZE - 1)
2308 left = PAGE_SIZE - 1;
2309 page = __get_free_page(GFP_TEMPORARY);
2310 kbuf = (char *) page;
2311 if (!kbuf)
2312 return -ENOMEM;
2313 if (copy_from_user(kbuf, buffer, left)) {
2314 err = -EFAULT;
2315 goto free;
2316 }
2317 kbuf[left] = 0;
2318 }
2319
2320 for (; left && vleft--; i++, first = 0) {
2321 unsigned long val;
2322
2323 if (write) {
2324 bool neg;
2325
2326 left -= proc_skip_spaces(&kbuf);
2327
2328 err = proc_get_long(&kbuf, &left, &val, &neg,
2329 proc_wspace_sep,
2330 sizeof(proc_wspace_sep), NULL);
2331 if (err)
2332 break;
2333 if (neg)
2334 continue;
2335 if ((min && val < *min) || (max && val > *max))
2336 continue;
2337 *i = val;
2338 } else {
2339 val = convdiv * (*i) / convmul;
2340 if (!first) {
2341 err = proc_put_char(&buffer, &left, '\t');
2342 if (err)
2343 break;
2344 }
2345 err = proc_put_long(&buffer, &left, val, false);
2346 if (err)
2347 break;
2348 }
2349 }
2350
2351 if (!write && !first && left && !err)
2352 err = proc_put_char(&buffer, &left, '\n');
2353 if (write && !err)
2354 left -= proc_skip_spaces(&kbuf);
2355 free:
2356 if (write) {
2357 free_page(page);
2358 if (first)
2359 return err ? : -EINVAL;
2360 }
2361 *lenp -= left;
2362 out:
2363 *ppos += *lenp;
2364 return err;
2365 }
2366
2367 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2368 void __user *buffer,
2369 size_t *lenp, loff_t *ppos,
2370 unsigned long convmul,
2371 unsigned long convdiv)
2372 {
2373 return __do_proc_doulongvec_minmax(table->data, table, write,
2374 buffer, lenp, ppos, convmul, convdiv);
2375 }
2376
2377 /**
2378 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2379 * @table: the sysctl table
2380 * @write: %TRUE if this is a write to the sysctl file
2381 * @buffer: the user buffer
2382 * @lenp: the size of the user buffer
2383 * @ppos: file position
2384 *
2385 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2386 * values from/to the user buffer, treated as an ASCII string.
2387 *
2388 * This routine will ensure the values are within the range specified by
2389 * table->extra1 (min) and table->extra2 (max).
2390 *
2391 * Returns 0 on success.
2392 */
2393 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2394 void __user *buffer, size_t *lenp, loff_t *ppos)
2395 {
2396 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2397 }
2398
2399 /**
2400 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2401 * @table: the sysctl table
2402 * @write: %TRUE if this is a write to the sysctl file
2403 * @buffer: the user buffer
2404 * @lenp: the size of the user buffer
2405 * @ppos: file position
2406 *
2407 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2408 * values from/to the user buffer, treated as an ASCII string. The values
2409 * are treated as milliseconds, and converted to jiffies when they are stored.
2410 *
2411 * This routine will ensure the values are within the range specified by
2412 * table->extra1 (min) and table->extra2 (max).
2413 *
2414 * Returns 0 on success.
2415 */
2416 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2417 void __user *buffer,
2418 size_t *lenp, loff_t *ppos)
2419 {
2420 return do_proc_doulongvec_minmax(table, write, buffer,
2421 lenp, ppos, HZ, 1000l);
2422 }
2423
2424
2425 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2426 int *valp,
2427 int write, void *data)
2428 {
2429 if (write) {
2430 if (*lvalp > LONG_MAX / HZ)
2431 return 1;
2432 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2433 } else {
2434 int val = *valp;
2435 unsigned long lval;
2436 if (val < 0) {
2437 *negp = true;
2438 lval = (unsigned long)-val;
2439 } else {
2440 *negp = false;
2441 lval = (unsigned long)val;
2442 }
2443 *lvalp = lval / HZ;
2444 }
2445 return 0;
2446 }
2447
2448 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2449 int *valp,
2450 int write, void *data)
2451 {
2452 if (write) {
2453 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2454 return 1;
2455 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2456 } else {
2457 int val = *valp;
2458 unsigned long lval;
2459 if (val < 0) {
2460 *negp = true;
2461 lval = (unsigned long)-val;
2462 } else {
2463 *negp = false;
2464 lval = (unsigned long)val;
2465 }
2466 *lvalp = jiffies_to_clock_t(lval);
2467 }
2468 return 0;
2469 }
2470
2471 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2472 int *valp,
2473 int write, void *data)
2474 {
2475 if (write) {
2476 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2477
2478 if (jif > INT_MAX)
2479 return 1;
2480 *valp = (int)jif;
2481 } else {
2482 int val = *valp;
2483 unsigned long lval;
2484 if (val < 0) {
2485 *negp = true;
2486 lval = (unsigned long)-val;
2487 } else {
2488 *negp = false;
2489 lval = (unsigned long)val;
2490 }
2491 *lvalp = jiffies_to_msecs(lval);
2492 }
2493 return 0;
2494 }
2495
2496 /**
2497 * proc_dointvec_jiffies - read a vector of integers as seconds
2498 * @table: the sysctl table
2499 * @write: %TRUE if this is a write to the sysctl file
2500 * @buffer: the user buffer
2501 * @lenp: the size of the user buffer
2502 * @ppos: file position
2503 *
2504 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2505 * values from/to the user buffer, treated as an ASCII string.
2506 * The values read are assumed to be in seconds, and are converted into
2507 * jiffies.
2508 *
2509 * Returns 0 on success.
2510 */
2511 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2512 void __user *buffer, size_t *lenp, loff_t *ppos)
2513 {
2514 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2515 do_proc_dointvec_jiffies_conv,NULL);
2516 }
2517
2518 /**
2519 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2520 * @table: the sysctl table
2521 * @write: %TRUE if this is a write to the sysctl file
2522 * @buffer: the user buffer
2523 * @lenp: the size of the user buffer
2524 * @ppos: pointer to the file position
2525 *
2526 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2527 * values from/to the user buffer, treated as an ASCII string.
2528 * The values read are assumed to be in 1/USER_HZ seconds, and
2529 * are converted into jiffies.
2530 *
2531 * Returns 0 on success.
2532 */
2533 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2534 void __user *buffer, size_t *lenp, loff_t *ppos)
2535 {
2536 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2537 do_proc_dointvec_userhz_jiffies_conv,NULL);
2538 }
2539
2540 /**
2541 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2542 * @table: the sysctl table
2543 * @write: %TRUE if this is a write to the sysctl file
2544 * @buffer: the user buffer
2545 * @lenp: the size of the user buffer
2546 * @ppos: file position
2547 * @ppos: the current position in the file
2548 *
2549 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2550 * values from/to the user buffer, treated as an ASCII string.
2551 * The values read are assumed to be in 1/1000 seconds, and
2552 * are converted into jiffies.
2553 *
2554 * Returns 0 on success.
2555 */
2556 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2557 void __user *buffer, size_t *lenp, loff_t *ppos)
2558 {
2559 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2560 do_proc_dointvec_ms_jiffies_conv, NULL);
2561 }
2562
2563 static int proc_do_cad_pid(struct ctl_table *table, int write,
2564 void __user *buffer, size_t *lenp, loff_t *ppos)
2565 {
2566 struct pid *new_pid;
2567 pid_t tmp;
2568 int r;
2569
2570 tmp = pid_vnr(cad_pid);
2571
2572 r = __do_proc_dointvec(&tmp, table, write, buffer,
2573 lenp, ppos, NULL, NULL);
2574 if (r || !write)
2575 return r;
2576
2577 new_pid = find_get_pid(tmp);
2578 if (!new_pid)
2579 return -ESRCH;
2580
2581 put_pid(xchg(&cad_pid, new_pid));
2582 return 0;
2583 }
2584
2585 /**
2586 * proc_do_large_bitmap - read/write from/to a large bitmap
2587 * @table: the sysctl table
2588 * @write: %TRUE if this is a write to the sysctl file
2589 * @buffer: the user buffer
2590 * @lenp: the size of the user buffer
2591 * @ppos: file position
2592 *
2593 * The bitmap is stored at table->data and the bitmap length (in bits)
2594 * in table->maxlen.
2595 *
2596 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2597 * large bitmaps may be represented in a compact manner. Writing into
2598 * the file will clear the bitmap then update it with the given input.
2599 *
2600 * Returns 0 on success.
2601 */
2602 int proc_do_large_bitmap(struct ctl_table *table, int write,
2603 void __user *buffer, size_t *lenp, loff_t *ppos)
2604 {
2605 int err = 0;
2606 bool first = 1;
2607 size_t left = *lenp;
2608 unsigned long bitmap_len = table->maxlen;
2609 unsigned long *bitmap = *(unsigned long **) table->data;
2610 unsigned long *tmp_bitmap = NULL;
2611 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2612
2613 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2614 *lenp = 0;
2615 return 0;
2616 }
2617
2618 if (write) {
2619 unsigned long page = 0;
2620 char *kbuf;
2621
2622 if (left > PAGE_SIZE - 1)
2623 left = PAGE_SIZE - 1;
2624
2625 page = __get_free_page(GFP_TEMPORARY);
2626 kbuf = (char *) page;
2627 if (!kbuf)
2628 return -ENOMEM;
2629 if (copy_from_user(kbuf, buffer, left)) {
2630 free_page(page);
2631 return -EFAULT;
2632 }
2633 kbuf[left] = 0;
2634
2635 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2636 GFP_KERNEL);
2637 if (!tmp_bitmap) {
2638 free_page(page);
2639 return -ENOMEM;
2640 }
2641 proc_skip_char(&kbuf, &left, '\n');
2642 while (!err && left) {
2643 unsigned long val_a, val_b;
2644 bool neg;
2645
2646 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2647 sizeof(tr_a), &c);
2648 if (err)
2649 break;
2650 if (val_a >= bitmap_len || neg) {
2651 err = -EINVAL;
2652 break;
2653 }
2654
2655 val_b = val_a;
2656 if (left) {
2657 kbuf++;
2658 left--;
2659 }
2660
2661 if (c == '-') {
2662 err = proc_get_long(&kbuf, &left, &val_b,
2663 &neg, tr_b, sizeof(tr_b),
2664 &c);
2665 if (err)
2666 break;
2667 if (val_b >= bitmap_len || neg ||
2668 val_a > val_b) {
2669 err = -EINVAL;
2670 break;
2671 }
2672 if (left) {
2673 kbuf++;
2674 left--;
2675 }
2676 }
2677
2678 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2679 first = 0;
2680 proc_skip_char(&kbuf, &left, '\n');
2681 }
2682 free_page(page);
2683 } else {
2684 unsigned long bit_a, bit_b = 0;
2685
2686 while (left) {
2687 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2688 if (bit_a >= bitmap_len)
2689 break;
2690 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2691 bit_a + 1) - 1;
2692
2693 if (!first) {
2694 err = proc_put_char(&buffer, &left, ',');
2695 if (err)
2696 break;
2697 }
2698 err = proc_put_long(&buffer, &left, bit_a, false);
2699 if (err)
2700 break;
2701 if (bit_a != bit_b) {
2702 err = proc_put_char(&buffer, &left, '-');
2703 if (err)
2704 break;
2705 err = proc_put_long(&buffer, &left, bit_b, false);
2706 if (err)
2707 break;
2708 }
2709
2710 first = 0; bit_b++;
2711 }
2712 if (!err)
2713 err = proc_put_char(&buffer, &left, '\n');
2714 }
2715
2716 if (!err) {
2717 if (write) {
2718 if (*ppos)
2719 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2720 else
2721 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2722 }
2723 kfree(tmp_bitmap);
2724 *lenp -= left;
2725 *ppos += *lenp;
2726 return 0;
2727 } else {
2728 kfree(tmp_bitmap);
2729 return err;
2730 }
2731 }
2732
2733 #else /* CONFIG_PROC_SYSCTL */
2734
2735 int proc_dostring(struct ctl_table *table, int write,
2736 void __user *buffer, size_t *lenp, loff_t *ppos)
2737 {
2738 return -ENOSYS;
2739 }
2740
2741 int proc_dointvec(struct ctl_table *table, int write,
2742 void __user *buffer, size_t *lenp, loff_t *ppos)
2743 {
2744 return -ENOSYS;
2745 }
2746
2747 int proc_dointvec_minmax(struct ctl_table *table, int write,
2748 void __user *buffer, size_t *lenp, loff_t *ppos)
2749 {
2750 return -ENOSYS;
2751 }
2752
2753 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2754 void __user *buffer, size_t *lenp, loff_t *ppos)
2755 {
2756 return -ENOSYS;
2757 }
2758
2759 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2760 void __user *buffer, size_t *lenp, loff_t *ppos)
2761 {
2762 return -ENOSYS;
2763 }
2764
2765 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2766 void __user *buffer, size_t *lenp, loff_t *ppos)
2767 {
2768 return -ENOSYS;
2769 }
2770
2771 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2772 void __user *buffer, size_t *lenp, loff_t *ppos)
2773 {
2774 return -ENOSYS;
2775 }
2776
2777 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2778 void __user *buffer,
2779 size_t *lenp, loff_t *ppos)
2780 {
2781 return -ENOSYS;
2782 }
2783
2784
2785 #endif /* CONFIG_PROC_SYSCTL */
2786
2787 /*
2788 * No sense putting this after each symbol definition, twice,
2789 * exception granted :-)
2790 */
2791 EXPORT_SYMBOL(proc_dointvec);
2792 EXPORT_SYMBOL(proc_dointvec_jiffies);
2793 EXPORT_SYMBOL(proc_dointvec_minmax);
2794 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2795 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2796 EXPORT_SYMBOL(proc_dostring);
2797 EXPORT_SYMBOL(proc_doulongvec_minmax);
2798 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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