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