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net/mlx4_core: Fix wrong index in propagating port change event to VFs
[linux/fpc-iii.git] / kernel / sysctl.c
blobc3eee4c6d6c1733593f2ca6fd9ac761649258865
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 static struct ctl_table fs_table[] = {
1535 {
1536 .procname = "inode-nr",
1537 .data = &inodes_stat,
1538 .maxlen = 2*sizeof(long),
1539 .mode = 0444,
1540 .proc_handler = proc_nr_inodes,
1541 },
1542 {
1543 .procname = "inode-state",
1544 .data = &inodes_stat,
1545 .maxlen = 7*sizeof(long),
1546 .mode = 0444,
1547 .proc_handler = proc_nr_inodes,
1548 },
1549 {
1550 .procname = "file-nr",
1551 .data = &files_stat,
1552 .maxlen = sizeof(files_stat),
1553 .mode = 0444,
1554 .proc_handler = proc_nr_files,
1555 },
1556 {
1557 .procname = "file-max",
1558 .data = &files_stat.max_files,
1559 .maxlen = sizeof(files_stat.max_files),
1560 .mode = 0644,
1561 .proc_handler = proc_doulongvec_minmax,
1562 },
1563 {
1564 .procname = "nr_open",
1565 .data = &sysctl_nr_open,
1566 .maxlen = sizeof(int),
1567 .mode = 0644,
1568 .proc_handler = proc_dointvec_minmax,
1569 .extra1 = &sysctl_nr_open_min,
1570 .extra2 = &sysctl_nr_open_max,
1571 },
1572 {
1573 .procname = "dentry-state",
1574 .data = &dentry_stat,
1575 .maxlen = 6*sizeof(long),
1576 .mode = 0444,
1577 .proc_handler = proc_nr_dentry,
1578 },
1579 {
1580 .procname = "overflowuid",
1581 .data = &fs_overflowuid,
1582 .maxlen = sizeof(int),
1583 .mode = 0644,
1584 .proc_handler = proc_dointvec_minmax,
1585 .extra1 = &minolduid,
1586 .extra2 = &maxolduid,
1587 },
1588 {
1589 .procname = "overflowgid",
1590 .data = &fs_overflowgid,
1591 .maxlen = sizeof(int),
1592 .mode = 0644,
1593 .proc_handler = proc_dointvec_minmax,
1594 .extra1 = &minolduid,
1595 .extra2 = &maxolduid,
1596 },
1597 #ifdef CONFIG_FILE_LOCKING
1598 {
1599 .procname = "leases-enable",
1600 .data = &leases_enable,
1601 .maxlen = sizeof(int),
1602 .mode = 0644,
1603 .proc_handler = proc_dointvec,
1604 },
1605 #endif
1606 #ifdef CONFIG_DNOTIFY
1607 {
1608 .procname = "dir-notify-enable",
1609 .data = &dir_notify_enable,
1610 .maxlen = sizeof(int),
1611 .mode = 0644,
1612 .proc_handler = proc_dointvec,
1613 },
1614 #endif
1615 #ifdef CONFIG_MMU
1616 #ifdef CONFIG_FILE_LOCKING
1617 {
1618 .procname = "lease-break-time",
1619 .data = &lease_break_time,
1620 .maxlen = sizeof(int),
1621 .mode = 0644,
1622 .proc_handler = proc_dointvec,
1623 },
1624 #endif
1625 #ifdef CONFIG_AIO
1626 {
1627 .procname = "aio-nr",
1628 .data = &aio_nr,
1629 .maxlen = sizeof(aio_nr),
1630 .mode = 0444,
1631 .proc_handler = proc_doulongvec_minmax,
1632 },
1633 {
1634 .procname = "aio-max-nr",
1635 .data = &aio_max_nr,
1636 .maxlen = sizeof(aio_max_nr),
1637 .mode = 0644,
1638 .proc_handler = proc_doulongvec_minmax,
1639 },
1640 #endif /* CONFIG_AIO */
1641 #ifdef CONFIG_INOTIFY_USER
1642 {
1643 .procname = "inotify",
1644 .mode = 0555,
1645 .child = inotify_table,
1646 },
1647 #endif
1648 #ifdef CONFIG_EPOLL
1649 {
1650 .procname = "epoll",
1651 .mode = 0555,
1652 .child = epoll_table,
1653 },
1654 #endif
1655 #endif
1656 {
1657 .procname = "protected_symlinks",
1658 .data = &sysctl_protected_symlinks,
1659 .maxlen = sizeof(int),
1660 .mode = 0600,
1661 .proc_handler = proc_dointvec_minmax,
1662 .extra1 = &zero,
1663 .extra2 = &one,
1664 },
1665 {
1666 .procname = "protected_hardlinks",
1667 .data = &sysctl_protected_hardlinks,
1668 .maxlen = sizeof(int),
1669 .mode = 0600,
1670 .proc_handler = proc_dointvec_minmax,
1671 .extra1 = &zero,
1672 .extra2 = &one,
1673 },
1674 {
1675 .procname = "suid_dumpable",
1676 .data = &suid_dumpable,
1677 .maxlen = sizeof(int),
1678 .mode = 0644,
1679 .proc_handler = proc_dointvec_minmax_coredump,
1680 .extra1 = &zero,
1681 .extra2 = &two,
1682 },
1683 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1684 {
1685 .procname = "binfmt_misc",
1686 .mode = 0555,
1687 .child = sysctl_mount_point,
1688 },
1689 #endif
1690 {
1691 .procname = "pipe-max-size",
1692 .data = &pipe_max_size,
1693 .maxlen = sizeof(int),
1694 .mode = 0644,
1695 .proc_handler = &pipe_proc_fn,
1696 .extra1 = &pipe_min_size,
1697 },
1698 { }
1699 };
1700
1701 static struct ctl_table debug_table[] = {
1702 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1703 {
1704 .procname = "exception-trace",
1705 .data = &show_unhandled_signals,
1706 .maxlen = sizeof(int),
1707 .mode = 0644,
1708 .proc_handler = proc_dointvec
1709 },
1710 #endif
1711 #if defined(CONFIG_OPTPROBES)
1712 {
1713 .procname = "kprobes-optimization",
1714 .data = &sysctl_kprobes_optimization,
1715 .maxlen = sizeof(int),
1716 .mode = 0644,
1717 .proc_handler = proc_kprobes_optimization_handler,
1718 .extra1 = &zero,
1719 .extra2 = &one,
1720 },
1721 #endif
1722 { }
1723 };
1724
1725 static struct ctl_table dev_table[] = {
1726 { }
1727 };
1728
1729 int __init sysctl_init(void)
1730 {
1731 struct ctl_table_header *hdr;
1732
1733 hdr = register_sysctl_table(sysctl_base_table);
1734 kmemleak_not_leak(hdr);
1735 return 0;
1736 }
1737
1738 #endif /* CONFIG_SYSCTL */
1739
1740 /*
1741 * /proc/sys support
1742 */
1743
1744 #ifdef CONFIG_PROC_SYSCTL
1745
1746 static int _proc_do_string(char *data, int maxlen, int write,
1747 char __user *buffer,
1748 size_t *lenp, loff_t *ppos)
1749 {
1750 size_t len;
1751 char __user *p;
1752 char c;
1753
1754 if (!data || !maxlen || !*lenp) {
1755 *lenp = 0;
1756 return 0;
1757 }
1758
1759 if (write) {
1760 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1761 /* Only continue writes not past the end of buffer. */
1762 len = strlen(data);
1763 if (len > maxlen - 1)
1764 len = maxlen - 1;
1765
1766 if (*ppos > len)
1767 return 0;
1768 len = *ppos;
1769 } else {
1770 /* Start writing from beginning of buffer. */
1771 len = 0;
1772 }
1773
1774 *ppos += *lenp;
1775 p = buffer;
1776 while ((p - buffer) < *lenp && len < maxlen - 1) {
1777 if (get_user(c, p++))
1778 return -EFAULT;
1779 if (c == 0 || c == '\n')
1780 break;
1781 data[len++] = c;
1782 }
1783 data[len] = 0;
1784 } else {
1785 len = strlen(data);
1786 if (len > maxlen)
1787 len = maxlen;
1788
1789 if (*ppos > len) {
1790 *lenp = 0;
1791 return 0;
1792 }
1793
1794 data += *ppos;
1795 len -= *ppos;
1796
1797 if (len > *lenp)
1798 len = *lenp;
1799 if (len)
1800 if (copy_to_user(buffer, data, len))
1801 return -EFAULT;
1802 if (len < *lenp) {
1803 if (put_user('\n', buffer + len))
1804 return -EFAULT;
1805 len++;
1806 }
1807 *lenp = len;
1808 *ppos += len;
1809 }
1810 return 0;
1811 }
1812
1813 static void warn_sysctl_write(struct ctl_table *table)
1814 {
1815 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1816 "This will not be supported in the future. To silence this\n"
1817 "warning, set kernel.sysctl_writes_strict = -1\n",
1818 current->comm, table->procname);
1819 }
1820
1821 /**
1822 * proc_dostring - read a string sysctl
1823 * @table: the sysctl table
1824 * @write: %TRUE if this is a write to the sysctl file
1825 * @buffer: the user buffer
1826 * @lenp: the size of the user buffer
1827 * @ppos: file position
1828 *
1829 * Reads/writes a string from/to the user buffer. If the kernel
1830 * buffer provided is not large enough to hold the string, the
1831 * string is truncated. The copied string is %NULL-terminated.
1832 * If the string is being read by the user process, it is copied
1833 * and a newline '\n' is added. It is truncated if the buffer is
1834 * not large enough.
1835 *
1836 * Returns 0 on success.
1837 */
1838 int proc_dostring(struct ctl_table *table, int write,
1839 void __user *buffer, size_t *lenp, loff_t *ppos)
1840 {
1841 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1842 warn_sysctl_write(table);
1843
1844 return _proc_do_string((char *)(table->data), table->maxlen, write,
1845 (char __user *)buffer, lenp, ppos);
1846 }
1847
1848 static size_t proc_skip_spaces(char **buf)
1849 {
1850 size_t ret;
1851 char *tmp = skip_spaces(*buf);
1852 ret = tmp - *buf;
1853 *buf = tmp;
1854 return ret;
1855 }
1856
1857 static void proc_skip_char(char **buf, size_t *size, const char v)
1858 {
1859 while (*size) {
1860 if (**buf != v)
1861 break;
1862 (*size)--;
1863 (*buf)++;
1864 }
1865 }
1866
1867 #define TMPBUFLEN 22
1868 /**
1869 * proc_get_long - reads an ASCII formatted integer from a user buffer
1870 *
1871 * @buf: a kernel buffer
1872 * @size: size of the kernel buffer
1873 * @val: this is where the number will be stored
1874 * @neg: set to %TRUE if number is negative
1875 * @perm_tr: a vector which contains the allowed trailers
1876 * @perm_tr_len: size of the perm_tr vector
1877 * @tr: pointer to store the trailer character
1878 *
1879 * In case of success %0 is returned and @buf and @size are updated with
1880 * the amount of bytes read. If @tr is non-NULL and a trailing
1881 * character exists (size is non-zero after returning from this
1882 * function), @tr is updated with the trailing character.
1883 */
1884 static int proc_get_long(char **buf, size_t *size,
1885 unsigned long *val, bool *neg,
1886 const char *perm_tr, unsigned perm_tr_len, char *tr)
1887 {
1888 int len;
1889 char *p, tmp[TMPBUFLEN];
1890
1891 if (!*size)
1892 return -EINVAL;
1893
1894 len = *size;
1895 if (len > TMPBUFLEN - 1)
1896 len = TMPBUFLEN - 1;
1897
1898 memcpy(tmp, *buf, len);
1899
1900 tmp[len] = 0;
1901 p = tmp;
1902 if (*p == '-' && *size > 1) {
1903 *neg = true;
1904 p++;
1905 } else
1906 *neg = false;
1907 if (!isdigit(*p))
1908 return -EINVAL;
1909
1910 *val = simple_strtoul(p, &p, 0);
1911
1912 len = p - tmp;
1913
1914 /* We don't know if the next char is whitespace thus we may accept
1915 * invalid integers (e.g. 1234...a) or two integers instead of one
1916 * (e.g. 123...1). So lets not allow such large numbers. */
1917 if (len == TMPBUFLEN - 1)
1918 return -EINVAL;
1919
1920 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1921 return -EINVAL;
1922
1923 if (tr && (len < *size))
1924 *tr = *p;
1925
1926 *buf += len;
1927 *size -= len;
1928
1929 return 0;
1930 }
1931
1932 /**
1933 * proc_put_long - converts an integer to a decimal ASCII formatted string
1934 *
1935 * @buf: the user buffer
1936 * @size: the size of the user buffer
1937 * @val: the integer to be converted
1938 * @neg: sign of the number, %TRUE for negative
1939 *
1940 * In case of success %0 is returned and @buf and @size are updated with
1941 * the amount of bytes written.
1942 */
1943 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1944 bool neg)
1945 {
1946 int len;
1947 char tmp[TMPBUFLEN], *p = tmp;
1948
1949 sprintf(p, "%s%lu", neg ? "-" : "", val);
1950 len = strlen(tmp);
1951 if (len > *size)
1952 len = *size;
1953 if (copy_to_user(*buf, tmp, len))
1954 return -EFAULT;
1955 *size -= len;
1956 *buf += len;
1957 return 0;
1958 }
1959 #undef TMPBUFLEN
1960
1961 static int proc_put_char(void __user **buf, size_t *size, char c)
1962 {
1963 if (*size) {
1964 char __user **buffer = (char __user **)buf;
1965 if (put_user(c, *buffer))
1966 return -EFAULT;
1967 (*size)--, (*buffer)++;
1968 *buf = *buffer;
1969 }
1970 return 0;
1971 }
1972
1973 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1974 int *valp,
1975 int write, void *data)
1976 {
1977 if (write) {
1978 if (*negp) {
1979 if (*lvalp > (unsigned long) INT_MAX + 1)
1980 return -EINVAL;
1981 *valp = -*lvalp;
1982 } else {
1983 if (*lvalp > (unsigned long) INT_MAX)
1984 return -EINVAL;
1985 *valp = *lvalp;
1986 }
1987 } else {
1988 int val = *valp;
1989 if (val < 0) {
1990 *negp = true;
1991 *lvalp = (unsigned long)-val;
1992 } else {
1993 *negp = false;
1994 *lvalp = (unsigned long)val;
1995 }
1996 }
1997 return 0;
1998 }
1999
2000 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2001
2002 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2003 int write, void __user *buffer,
2004 size_t *lenp, loff_t *ppos,
2005 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2006 int write, void *data),
2007 void *data)
2008 {
2009 int *i, vleft, first = 1, err = 0;
2010 unsigned long page = 0;
2011 size_t left;
2012 char *kbuf;
2013
2014 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2015 *lenp = 0;
2016 return 0;
2017 }
2018
2019 i = (int *) tbl_data;
2020 vleft = table->maxlen / sizeof(*i);
2021 left = *lenp;
2022
2023 if (!conv)
2024 conv = do_proc_dointvec_conv;
2025
2026 if (write) {
2027 if (*ppos) {
2028 switch (sysctl_writes_strict) {
2029 case SYSCTL_WRITES_STRICT:
2030 goto out;
2031 case SYSCTL_WRITES_WARN:
2032 warn_sysctl_write(table);
2033 break;
2034 default:
2035 break;
2036 }
2037 }
2038
2039 if (left > PAGE_SIZE - 1)
2040 left = PAGE_SIZE - 1;
2041 page = __get_free_page(GFP_TEMPORARY);
2042 kbuf = (char *) page;
2043 if (!kbuf)
2044 return -ENOMEM;
2045 if (copy_from_user(kbuf, buffer, left)) {
2046 err = -EFAULT;
2047 goto free;
2048 }
2049 kbuf[left] = 0;
2050 }
2051
2052 for (; left && vleft--; i++, first=0) {
2053 unsigned long lval;
2054 bool neg;
2055
2056 if (write) {
2057 left -= proc_skip_spaces(&kbuf);
2058
2059 if (!left)
2060 break;
2061 err = proc_get_long(&kbuf, &left, &lval, &neg,
2062 proc_wspace_sep,
2063 sizeof(proc_wspace_sep), NULL);
2064 if (err)
2065 break;
2066 if (conv(&neg, &lval, i, 1, data)) {
2067 err = -EINVAL;
2068 break;
2069 }
2070 } else {
2071 if (conv(&neg, &lval, i, 0, data)) {
2072 err = -EINVAL;
2073 break;
2074 }
2075 if (!first)
2076 err = proc_put_char(&buffer, &left, '\t');
2077 if (err)
2078 break;
2079 err = proc_put_long(&buffer, &left, lval, neg);
2080 if (err)
2081 break;
2082 }
2083 }
2084
2085 if (!write && !first && left && !err)
2086 err = proc_put_char(&buffer, &left, '\n');
2087 if (write && !err && left)
2088 left -= proc_skip_spaces(&kbuf);
2089 free:
2090 if (write) {
2091 free_page(page);
2092 if (first)
2093 return err ? : -EINVAL;
2094 }
2095 *lenp -= left;
2096 out:
2097 *ppos += *lenp;
2098 return err;
2099 }
2100
2101 static int do_proc_dointvec(struct ctl_table *table, int write,
2102 void __user *buffer, size_t *lenp, loff_t *ppos,
2103 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2104 int write, void *data),
2105 void *data)
2106 {
2107 return __do_proc_dointvec(table->data, table, write,
2108 buffer, lenp, ppos, conv, data);
2109 }
2110
2111 /**
2112 * proc_dointvec - read a vector of integers
2113 * @table: the sysctl table
2114 * @write: %TRUE if this is a write to the sysctl file
2115 * @buffer: the user buffer
2116 * @lenp: the size of the user buffer
2117 * @ppos: file position
2118 *
2119 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2120 * values from/to the user buffer, treated as an ASCII string.
2121 *
2122 * Returns 0 on success.
2123 */
2124 int proc_dointvec(struct ctl_table *table, int write,
2125 void __user *buffer, size_t *lenp, loff_t *ppos)
2126 {
2127 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2128 NULL,NULL);
2129 }
2130
2131 /*
2132 * Taint values can only be increased
2133 * This means we can safely use a temporary.
2134 */
2135 static int proc_taint(struct ctl_table *table, int write,
2136 void __user *buffer, size_t *lenp, loff_t *ppos)
2137 {
2138 struct ctl_table t;
2139 unsigned long tmptaint = get_taint();
2140 int err;
2141
2142 if (write && !capable(CAP_SYS_ADMIN))
2143 return -EPERM;
2144
2145 t = *table;
2146 t.data = &tmptaint;
2147 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2148 if (err < 0)
2149 return err;
2150
2151 if (write) {
2152 /*
2153 * Poor man's atomic or. Not worth adding a primitive
2154 * to everyone's atomic.h for this
2155 */
2156 int i;
2157 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2158 if ((tmptaint >> i) & 1)
2159 add_taint(i, LOCKDEP_STILL_OK);
2160 }
2161 }
2162
2163 return err;
2164 }
2165
2166 #ifdef CONFIG_PRINTK
2167 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2168 void __user *buffer, size_t *lenp, loff_t *ppos)
2169 {
2170 if (write && !capable(CAP_SYS_ADMIN))
2171 return -EPERM;
2172
2173 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2174 }
2175 #endif
2176
2177 struct do_proc_dointvec_minmax_conv_param {
2178 int *min;
2179 int *max;
2180 };
2181
2182 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2183 int *valp,
2184 int write, void *data)
2185 {
2186 struct do_proc_dointvec_minmax_conv_param *param = data;
2187 if (write) {
2188 int val = *negp ? -*lvalp : *lvalp;
2189 if ((param->min && *param->min > val) ||
2190 (param->max && *param->max < val))
2191 return -EINVAL;
2192 *valp = val;
2193 } else {
2194 int val = *valp;
2195 if (val < 0) {
2196 *negp = true;
2197 *lvalp = (unsigned long)-val;
2198 } else {
2199 *negp = false;
2200 *lvalp = (unsigned long)val;
2201 }
2202 }
2203 return 0;
2204 }
2205
2206 /**
2207 * proc_dointvec_minmax - read a vector of integers with min/max values
2208 * @table: the sysctl table
2209 * @write: %TRUE if this is a write to the sysctl file
2210 * @buffer: the user buffer
2211 * @lenp: the size of the user buffer
2212 * @ppos: file position
2213 *
2214 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2215 * values from/to the user buffer, treated as an ASCII string.
2216 *
2217 * This routine will ensure the values are within the range specified by
2218 * table->extra1 (min) and table->extra2 (max).
2219 *
2220 * Returns 0 on success.
2221 */
2222 int proc_dointvec_minmax(struct ctl_table *table, int write,
2223 void __user *buffer, size_t *lenp, loff_t *ppos)
2224 {
2225 struct do_proc_dointvec_minmax_conv_param param = {
2226 .min = (int *) table->extra1,
2227 .max = (int *) table->extra2,
2228 };
2229 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2230 do_proc_dointvec_minmax_conv, &param);
2231 }
2232
2233 static void validate_coredump_safety(void)
2234 {
2235 #ifdef CONFIG_COREDUMP
2236 if (suid_dumpable == SUID_DUMP_ROOT &&
2237 core_pattern[0] != '/' && core_pattern[0] != '|') {
2238 printk(KERN_WARNING "Unsafe core_pattern used with "\
2239 "suid_dumpable=2. Pipe handler or fully qualified "\
2240 "core dump path required.\n");
2241 }
2242 #endif
2243 }
2244
2245 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2246 void __user *buffer, size_t *lenp, loff_t *ppos)
2247 {
2248 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2249 if (!error)
2250 validate_coredump_safety();
2251 return error;
2252 }
2253
2254 #ifdef CONFIG_COREDUMP
2255 static int proc_dostring_coredump(struct ctl_table *table, int write,
2256 void __user *buffer, size_t *lenp, loff_t *ppos)
2257 {
2258 int error = proc_dostring(table, write, buffer, lenp, ppos);
2259 if (!error)
2260 validate_coredump_safety();
2261 return error;
2262 }
2263 #endif
2264
2265 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2266 void __user *buffer,
2267 size_t *lenp, loff_t *ppos,
2268 unsigned long convmul,
2269 unsigned long convdiv)
2270 {
2271 unsigned long *i, *min, *max;
2272 int vleft, first = 1, err = 0;
2273 unsigned long page = 0;
2274 size_t left;
2275 char *kbuf;
2276
2277 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2278 *lenp = 0;
2279 return 0;
2280 }
2281
2282 i = (unsigned long *) data;
2283 min = (unsigned long *) table->extra1;
2284 max = (unsigned long *) table->extra2;
2285 vleft = table->maxlen / sizeof(unsigned long);
2286 left = *lenp;
2287
2288 if (write) {
2289 if (*ppos) {
2290 switch (sysctl_writes_strict) {
2291 case SYSCTL_WRITES_STRICT:
2292 goto out;
2293 case SYSCTL_WRITES_WARN:
2294 warn_sysctl_write(table);
2295 break;
2296 default:
2297 break;
2298 }
2299 }
2300
2301 if (left > PAGE_SIZE - 1)
2302 left = PAGE_SIZE - 1;
2303 page = __get_free_page(GFP_TEMPORARY);
2304 kbuf = (char *) page;
2305 if (!kbuf)
2306 return -ENOMEM;
2307 if (copy_from_user(kbuf, buffer, left)) {
2308 err = -EFAULT;
2309 goto free;
2310 }
2311 kbuf[left] = 0;
2312 }
2313
2314 for (; left && vleft--; i++, first = 0) {
2315 unsigned long val;
2316
2317 if (write) {
2318 bool neg;
2319
2320 left -= proc_skip_spaces(&kbuf);
2321
2322 err = proc_get_long(&kbuf, &left, &val, &neg,
2323 proc_wspace_sep,
2324 sizeof(proc_wspace_sep), NULL);
2325 if (err)
2326 break;
2327 if (neg)
2328 continue;
2329 if ((min && val < *min) || (max && val > *max))
2330 continue;
2331 *i = val;
2332 } else {
2333 val = convdiv * (*i) / convmul;
2334 if (!first) {
2335 err = proc_put_char(&buffer, &left, '\t');
2336 if (err)
2337 break;
2338 }
2339 err = proc_put_long(&buffer, &left, val, false);
2340 if (err)
2341 break;
2342 }
2343 }
2344
2345 if (!write && !first && left && !err)
2346 err = proc_put_char(&buffer, &left, '\n');
2347 if (write && !err)
2348 left -= proc_skip_spaces(&kbuf);
2349 free:
2350 if (write) {
2351 free_page(page);
2352 if (first)
2353 return err ? : -EINVAL;
2354 }
2355 *lenp -= left;
2356 out:
2357 *ppos += *lenp;
2358 return err;
2359 }
2360
2361 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2362 void __user *buffer,
2363 size_t *lenp, loff_t *ppos,
2364 unsigned long convmul,
2365 unsigned long convdiv)
2366 {
2367 return __do_proc_doulongvec_minmax(table->data, table, write,
2368 buffer, lenp, ppos, convmul, convdiv);
2369 }
2370
2371 /**
2372 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2373 * @table: the sysctl table
2374 * @write: %TRUE if this is a write to the sysctl file
2375 * @buffer: the user buffer
2376 * @lenp: the size of the user buffer
2377 * @ppos: file position
2378 *
2379 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2380 * values from/to the user buffer, treated as an ASCII string.
2381 *
2382 * This routine will ensure the values are within the range specified by
2383 * table->extra1 (min) and table->extra2 (max).
2384 *
2385 * Returns 0 on success.
2386 */
2387 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2388 void __user *buffer, size_t *lenp, loff_t *ppos)
2389 {
2390 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2391 }
2392
2393 /**
2394 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2395 * @table: the sysctl table
2396 * @write: %TRUE if this is a write to the sysctl file
2397 * @buffer: the user buffer
2398 * @lenp: the size of the user buffer
2399 * @ppos: file position
2400 *
2401 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2402 * values from/to the user buffer, treated as an ASCII string. The values
2403 * are treated as milliseconds, and converted to jiffies when they are stored.
2404 *
2405 * This routine will ensure the values are within the range specified by
2406 * table->extra1 (min) and table->extra2 (max).
2407 *
2408 * Returns 0 on success.
2409 */
2410 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2411 void __user *buffer,
2412 size_t *lenp, loff_t *ppos)
2413 {
2414 return do_proc_doulongvec_minmax(table, write, buffer,
2415 lenp, ppos, HZ, 1000l);
2416 }
2417
2418
2419 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2420 int *valp,
2421 int write, void *data)
2422 {
2423 if (write) {
2424 if (*lvalp > LONG_MAX / HZ)
2425 return 1;
2426 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2427 } else {
2428 int val = *valp;
2429 unsigned long lval;
2430 if (val < 0) {
2431 *negp = true;
2432 lval = (unsigned long)-val;
2433 } else {
2434 *negp = false;
2435 lval = (unsigned long)val;
2436 }
2437 *lvalp = lval / HZ;
2438 }
2439 return 0;
2440 }
2441
2442 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2443 int *valp,
2444 int write, void *data)
2445 {
2446 if (write) {
2447 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2448 return 1;
2449 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2450 } else {
2451 int val = *valp;
2452 unsigned long lval;
2453 if (val < 0) {
2454 *negp = true;
2455 lval = (unsigned long)-val;
2456 } else {
2457 *negp = false;
2458 lval = (unsigned long)val;
2459 }
2460 *lvalp = jiffies_to_clock_t(lval);
2461 }
2462 return 0;
2463 }
2464
2465 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2466 int *valp,
2467 int write, void *data)
2468 {
2469 if (write) {
2470 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2471
2472 if (jif > INT_MAX)
2473 return 1;
2474 *valp = (int)jif;
2475 } else {
2476 int val = *valp;
2477 unsigned long lval;
2478 if (val < 0) {
2479 *negp = true;
2480 lval = (unsigned long)-val;
2481 } else {
2482 *negp = false;
2483 lval = (unsigned long)val;
2484 }
2485 *lvalp = jiffies_to_msecs(lval);
2486 }
2487 return 0;
2488 }
2489
2490 /**
2491 * proc_dointvec_jiffies - read a vector of integers as seconds
2492 * @table: the sysctl table
2493 * @write: %TRUE if this is a write to the sysctl file
2494 * @buffer: the user buffer
2495 * @lenp: the size of the user buffer
2496 * @ppos: file position
2497 *
2498 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2499 * values from/to the user buffer, treated as an ASCII string.
2500 * The values read are assumed to be in seconds, and are converted into
2501 * jiffies.
2502 *
2503 * Returns 0 on success.
2504 */
2505 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2506 void __user *buffer, size_t *lenp, loff_t *ppos)
2507 {
2508 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2509 do_proc_dointvec_jiffies_conv,NULL);
2510 }
2511
2512 /**
2513 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2514 * @table: the sysctl table
2515 * @write: %TRUE if this is a write to the sysctl file
2516 * @buffer: the user buffer
2517 * @lenp: the size of the user buffer
2518 * @ppos: pointer to the file position
2519 *
2520 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2521 * values from/to the user buffer, treated as an ASCII string.
2522 * The values read are assumed to be in 1/USER_HZ seconds, and
2523 * are converted into jiffies.
2524 *
2525 * Returns 0 on success.
2526 */
2527 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2528 void __user *buffer, size_t *lenp, loff_t *ppos)
2529 {
2530 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2531 do_proc_dointvec_userhz_jiffies_conv,NULL);
2532 }
2533
2534 /**
2535 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2536 * @table: the sysctl table
2537 * @write: %TRUE if this is a write to the sysctl file
2538 * @buffer: the user buffer
2539 * @lenp: the size of the user buffer
2540 * @ppos: file position
2541 * @ppos: the current position in the file
2542 *
2543 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2544 * values from/to the user buffer, treated as an ASCII string.
2545 * The values read are assumed to be in 1/1000 seconds, and
2546 * are converted into jiffies.
2547 *
2548 * Returns 0 on success.
2549 */
2550 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2551 void __user *buffer, size_t *lenp, loff_t *ppos)
2552 {
2553 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2554 do_proc_dointvec_ms_jiffies_conv, NULL);
2555 }
2556
2557 static int proc_do_cad_pid(struct ctl_table *table, int write,
2558 void __user *buffer, size_t *lenp, loff_t *ppos)
2559 {
2560 struct pid *new_pid;
2561 pid_t tmp;
2562 int r;
2563
2564 tmp = pid_vnr(cad_pid);
2565
2566 r = __do_proc_dointvec(&tmp, table, write, buffer,
2567 lenp, ppos, NULL, NULL);
2568 if (r || !write)
2569 return r;
2570
2571 new_pid = find_get_pid(tmp);
2572 if (!new_pid)
2573 return -ESRCH;
2574
2575 put_pid(xchg(&cad_pid, new_pid));
2576 return 0;
2577 }
2578
2579 /**
2580 * proc_do_large_bitmap - read/write from/to a large bitmap
2581 * @table: the sysctl table
2582 * @write: %TRUE if this is a write to the sysctl file
2583 * @buffer: the user buffer
2584 * @lenp: the size of the user buffer
2585 * @ppos: file position
2586 *
2587 * The bitmap is stored at table->data and the bitmap length (in bits)
2588 * in table->maxlen.
2589 *
2590 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2591 * large bitmaps may be represented in a compact manner. Writing into
2592 * the file will clear the bitmap then update it with the given input.
2593 *
2594 * Returns 0 on success.
2595 */
2596 int proc_do_large_bitmap(struct ctl_table *table, int write,
2597 void __user *buffer, size_t *lenp, loff_t *ppos)
2598 {
2599 int err = 0;
2600 bool first = 1;
2601 size_t left = *lenp;
2602 unsigned long bitmap_len = table->maxlen;
2603 unsigned long *bitmap = *(unsigned long **) table->data;
2604 unsigned long *tmp_bitmap = NULL;
2605 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2606
2607 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2608 *lenp = 0;
2609 return 0;
2610 }
2611
2612 if (write) {
2613 unsigned long page = 0;
2614 char *kbuf;
2615
2616 if (left > PAGE_SIZE - 1)
2617 left = PAGE_SIZE - 1;
2618
2619 page = __get_free_page(GFP_TEMPORARY);
2620 kbuf = (char *) page;
2621 if (!kbuf)
2622 return -ENOMEM;
2623 if (copy_from_user(kbuf, buffer, left)) {
2624 free_page(page);
2625 return -EFAULT;
2626 }
2627 kbuf[left] = 0;
2628
2629 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2630 GFP_KERNEL);
2631 if (!tmp_bitmap) {
2632 free_page(page);
2633 return -ENOMEM;
2634 }
2635 proc_skip_char(&kbuf, &left, '\n');
2636 while (!err && left) {
2637 unsigned long val_a, val_b;
2638 bool neg;
2639
2640 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2641 sizeof(tr_a), &c);
2642 if (err)
2643 break;
2644 if (val_a >= bitmap_len || neg) {
2645 err = -EINVAL;
2646 break;
2647 }
2648
2649 val_b = val_a;
2650 if (left) {
2651 kbuf++;
2652 left--;
2653 }
2654
2655 if (c == '-') {
2656 err = proc_get_long(&kbuf, &left, &val_b,
2657 &neg, tr_b, sizeof(tr_b),
2658 &c);
2659 if (err)
2660 break;
2661 if (val_b >= bitmap_len || neg ||
2662 val_a > val_b) {
2663 err = -EINVAL;
2664 break;
2665 }
2666 if (left) {
2667 kbuf++;
2668 left--;
2669 }
2670 }
2671
2672 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2673 first = 0;
2674 proc_skip_char(&kbuf, &left, '\n');
2675 }
2676 free_page(page);
2677 } else {
2678 unsigned long bit_a, bit_b = 0;
2679
2680 while (left) {
2681 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2682 if (bit_a >= bitmap_len)
2683 break;
2684 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2685 bit_a + 1) - 1;
2686
2687 if (!first) {
2688 err = proc_put_char(&buffer, &left, ',');
2689 if (err)
2690 break;
2691 }
2692 err = proc_put_long(&buffer, &left, bit_a, false);
2693 if (err)
2694 break;
2695 if (bit_a != bit_b) {
2696 err = proc_put_char(&buffer, &left, '-');
2697 if (err)
2698 break;
2699 err = proc_put_long(&buffer, &left, bit_b, false);
2700 if (err)
2701 break;
2702 }
2703
2704 first = 0; bit_b++;
2705 }
2706 if (!err)
2707 err = proc_put_char(&buffer, &left, '\n');
2708 }
2709
2710 if (!err) {
2711 if (write) {
2712 if (*ppos)
2713 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2714 else
2715 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2716 }
2717 kfree(tmp_bitmap);
2718 *lenp -= left;
2719 *ppos += *lenp;
2720 return 0;
2721 } else {
2722 kfree(tmp_bitmap);
2723 return err;
2724 }
2725 }
2726
2727 #else /* CONFIG_PROC_SYSCTL */
2728
2729 int proc_dostring(struct ctl_table *table, int write,
2730 void __user *buffer, size_t *lenp, loff_t *ppos)
2731 {
2732 return -ENOSYS;
2733 }
2734
2735 int proc_dointvec(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_minmax(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_jiffies(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_userhz_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_ms_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_doulongvec_minmax(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_ms_jiffies_minmax(struct ctl_table *table, int write,
2772 void __user *buffer,
2773 size_t *lenp, loff_t *ppos)
2774 {
2775 return -ENOSYS;
2776 }
2777
2778
2779 #endif /* CONFIG_PROC_SYSCTL */
2780
2781 /*
2782 * No sense putting this after each symbol definition, twice,
2783 * exception granted :-)
2784 */
2785 EXPORT_SYMBOL(proc_dointvec);
2786 EXPORT_SYMBOL(proc_dointvec_jiffies);
2787 EXPORT_SYMBOL(proc_dointvec_minmax);
2788 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2789 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2790 EXPORT_SYMBOL(proc_dostring);
2791 EXPORT_SYMBOL(proc_doulongvec_minmax);
2792 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux with added FPC-III support