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[mirror_ubuntu-zesty-kernel.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/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
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
68
69 #ifdef CONFIG_X86
70 #include <asm/nmi.h>
71 #include <asm/stacktrace.h>
72 #include <asm/io.h>
73 #endif
74 #ifdef CONFIG_SPARC
75 #include <asm/setup.h>
76 #endif
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
79 #endif
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
82 #endif
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
85 #endif
86 #ifdef CONFIG_CHR_DEV_SG
87 #include <scsi/sg.h>
88 #endif
89
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
92 #endif
93
94
95 #if defined(CONFIG_SYSCTL)
96
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory;
99 extern int sysctl_overcommit_ratio;
100 extern int max_threads;
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
106 #endif
107 extern int pid_max;
108 extern int pid_max_min, pid_max_max;
109 extern int percpu_pagelist_fraction;
110 extern int compat_log;
111 extern int latencytop_enabled;
112 extern int sysctl_nr_open_min, sysctl_nr_open_max;
113 #ifndef CONFIG_MMU
114 extern int sysctl_nr_trim_pages;
115 #endif
116 #ifdef CONFIG_BLOCK
117 extern int blk_iopoll_enabled;
118 #endif
119
120 /* Constants used for minimum and maximum */
121 #ifdef CONFIG_LOCKUP_DETECTOR
122 static int sixty = 60;
123 static int neg_one = -1;
124 #endif
125
126 static int zero;
127 static int __maybe_unused one = 1;
128 static int __maybe_unused two = 2;
129 static int __maybe_unused three = 3;
130 static unsigned long one_ul = 1;
131 static int one_hundred = 100;
132 #ifdef CONFIG_PRINTK
133 static int ten_thousand = 10000;
134 #endif
135
136 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
137 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
138
139 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
140 static int maxolduid = 65535;
141 static int minolduid;
142 static int min_percpu_pagelist_fract = 8;
143
144 static int ngroups_max = NGROUPS_MAX;
145 static const int cap_last_cap = CAP_LAST_CAP;
146
147 #ifdef CONFIG_INOTIFY_USER
148 #include <linux/inotify.h>
149 #endif
150 #ifdef CONFIG_SPARC
151 #endif
152
153 #ifdef CONFIG_SPARC64
154 extern int sysctl_tsb_ratio;
155 #endif
156
157 #ifdef __hppa__
158 extern int pwrsw_enabled;
159 #endif
160
161 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
162 extern int unaligned_enabled;
163 #endif
164
165 #ifdef CONFIG_IA64
166 extern int unaligned_dump_stack;
167 #endif
168
169 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
170 extern int no_unaligned_warning;
171 #endif
172
173 #ifdef CONFIG_PROC_SYSCTL
174 static int proc_do_cad_pid(struct ctl_table *table, int write,
175 void __user *buffer, size_t *lenp, loff_t *ppos);
176 static int proc_taint(struct ctl_table *table, int write,
177 void __user *buffer, size_t *lenp, loff_t *ppos);
178 #endif
179
180 #ifdef CONFIG_PRINTK
181 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 #endif
184
185 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
187 #ifdef CONFIG_COREDUMP
188 static int proc_dostring_coredump(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
190 #endif
191
192 #ifdef CONFIG_MAGIC_SYSRQ
193 /* Note: sysrq code uses it's own private copy */
194 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
195
196 static int sysrq_sysctl_handler(ctl_table *table, int write,
197 void __user *buffer, size_t *lenp,
198 loff_t *ppos)
199 {
200 int error;
201
202 error = proc_dointvec(table, write, buffer, lenp, ppos);
203 if (error)
204 return error;
205
206 if (write)
207 sysrq_toggle_support(__sysrq_enabled);
208
209 return 0;
210 }
211
212 #endif
213
214 static struct ctl_table kern_table[];
215 static struct ctl_table vm_table[];
216 static struct ctl_table fs_table[];
217 static struct ctl_table debug_table[];
218 static struct ctl_table dev_table[];
219 extern struct ctl_table random_table[];
220 #ifdef CONFIG_EPOLL
221 extern struct ctl_table epoll_table[];
222 #endif
223
224 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
225 int sysctl_legacy_va_layout;
226 #endif
227
228 /* The default sysctl tables: */
229
230 static struct ctl_table sysctl_base_table[] = {
231 {
232 .procname = "kernel",
233 .mode = 0555,
234 .child = kern_table,
235 },
236 {
237 .procname = "vm",
238 .mode = 0555,
239 .child = vm_table,
240 },
241 {
242 .procname = "fs",
243 .mode = 0555,
244 .child = fs_table,
245 },
246 {
247 .procname = "debug",
248 .mode = 0555,
249 .child = debug_table,
250 },
251 {
252 .procname = "dev",
253 .mode = 0555,
254 .child = dev_table,
255 },
256 { }
257 };
258
259 #ifdef CONFIG_SCHED_DEBUG
260 static int min_sched_granularity_ns = 100000; /* 100 usecs */
261 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
262 static int min_wakeup_granularity_ns; /* 0 usecs */
263 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
264 #ifdef CONFIG_SMP
265 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
266 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
267 #endif /* CONFIG_SMP */
268 #endif /* CONFIG_SCHED_DEBUG */
269
270 #ifdef CONFIG_COMPACTION
271 static int min_extfrag_threshold;
272 static int max_extfrag_threshold = 1000;
273 #endif
274
275 static struct ctl_table kern_table[] = {
276 {
277 .procname = "sched_child_runs_first",
278 .data = &sysctl_sched_child_runs_first,
279 .maxlen = sizeof(unsigned int),
280 .mode = 0644,
281 .proc_handler = proc_dointvec,
282 },
283 #ifdef CONFIG_SCHED_DEBUG
284 {
285 .procname = "sched_min_granularity_ns",
286 .data = &sysctl_sched_min_granularity,
287 .maxlen = sizeof(unsigned int),
288 .mode = 0644,
289 .proc_handler = sched_proc_update_handler,
290 .extra1 = &min_sched_granularity_ns,
291 .extra2 = &max_sched_granularity_ns,
292 },
293 {
294 .procname = "sched_latency_ns",
295 .data = &sysctl_sched_latency,
296 .maxlen = sizeof(unsigned int),
297 .mode = 0644,
298 .proc_handler = sched_proc_update_handler,
299 .extra1 = &min_sched_granularity_ns,
300 .extra2 = &max_sched_granularity_ns,
301 },
302 {
303 .procname = "sched_wakeup_granularity_ns",
304 .data = &sysctl_sched_wakeup_granularity,
305 .maxlen = sizeof(unsigned int),
306 .mode = 0644,
307 .proc_handler = sched_proc_update_handler,
308 .extra1 = &min_wakeup_granularity_ns,
309 .extra2 = &max_wakeup_granularity_ns,
310 },
311 #ifdef CONFIG_SMP
312 {
313 .procname = "sched_tunable_scaling",
314 .data = &sysctl_sched_tunable_scaling,
315 .maxlen = sizeof(enum sched_tunable_scaling),
316 .mode = 0644,
317 .proc_handler = sched_proc_update_handler,
318 .extra1 = &min_sched_tunable_scaling,
319 .extra2 = &max_sched_tunable_scaling,
320 },
321 {
322 .procname = "sched_migration_cost_ns",
323 .data = &sysctl_sched_migration_cost,
324 .maxlen = sizeof(unsigned int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec,
327 },
328 {
329 .procname = "sched_nr_migrate",
330 .data = &sysctl_sched_nr_migrate,
331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
333 .proc_handler = proc_dointvec,
334 },
335 {
336 .procname = "sched_time_avg_ms",
337 .data = &sysctl_sched_time_avg,
338 .maxlen = sizeof(unsigned int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec,
341 },
342 {
343 .procname = "sched_shares_window_ns",
344 .data = &sysctl_sched_shares_window,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec,
348 },
349 {
350 .procname = "timer_migration",
351 .data = &sysctl_timer_migration,
352 .maxlen = sizeof(unsigned int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec_minmax,
355 .extra1 = &zero,
356 .extra2 = &one,
357 },
358 #endif /* CONFIG_SMP */
359 #ifdef CONFIG_NUMA_BALANCING
360 {
361 .procname = "numa_balancing_scan_delay_ms",
362 .data = &sysctl_numa_balancing_scan_delay,
363 .maxlen = sizeof(unsigned int),
364 .mode = 0644,
365 .proc_handler = proc_dointvec,
366 },
367 {
368 .procname = "numa_balancing_scan_period_min_ms",
369 .data = &sysctl_numa_balancing_scan_period_min,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec,
373 },
374 {
375 .procname = "numa_balancing_scan_period_reset",
376 .data = &sysctl_numa_balancing_scan_period_reset,
377 .maxlen = sizeof(unsigned int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec,
380 },
381 {
382 .procname = "numa_balancing_scan_period_max_ms",
383 .data = &sysctl_numa_balancing_scan_period_max,
384 .maxlen = sizeof(unsigned int),
385 .mode = 0644,
386 .proc_handler = proc_dointvec,
387 },
388 {
389 .procname = "numa_balancing_scan_size_mb",
390 .data = &sysctl_numa_balancing_scan_size,
391 .maxlen = sizeof(unsigned int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec,
394 },
395 #endif /* CONFIG_NUMA_BALANCING */
396 #endif /* CONFIG_SCHED_DEBUG */
397 {
398 .procname = "sched_rt_period_us",
399 .data = &sysctl_sched_rt_period,
400 .maxlen = sizeof(unsigned int),
401 .mode = 0644,
402 .proc_handler = sched_rt_handler,
403 },
404 {
405 .procname = "sched_rt_runtime_us",
406 .data = &sysctl_sched_rt_runtime,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = sched_rt_handler,
410 },
411 {
412 .procname = "sched_rr_timeslice_ms",
413 .data = &sched_rr_timeslice,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = sched_rr_handler,
417 },
418 #ifdef CONFIG_SCHED_AUTOGROUP
419 {
420 .procname = "sched_autogroup_enabled",
421 .data = &sysctl_sched_autogroup_enabled,
422 .maxlen = sizeof(unsigned int),
423 .mode = 0644,
424 .proc_handler = proc_dointvec_minmax,
425 .extra1 = &zero,
426 .extra2 = &one,
427 },
428 #endif
429 #ifdef CONFIG_CFS_BANDWIDTH
430 {
431 .procname = "sched_cfs_bandwidth_slice_us",
432 .data = &sysctl_sched_cfs_bandwidth_slice,
433 .maxlen = sizeof(unsigned int),
434 .mode = 0644,
435 .proc_handler = proc_dointvec_minmax,
436 .extra1 = &one,
437 },
438 #endif
439 #ifdef CONFIG_PROVE_LOCKING
440 {
441 .procname = "prove_locking",
442 .data = &prove_locking,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec,
446 },
447 #endif
448 #ifdef CONFIG_LOCK_STAT
449 {
450 .procname = "lock_stat",
451 .data = &lock_stat,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec,
455 },
456 #endif
457 {
458 .procname = "panic",
459 .data = &panic_timeout,
460 .maxlen = sizeof(int),
461 .mode = 0644,
462 .proc_handler = proc_dointvec,
463 },
464 #ifdef CONFIG_COREDUMP
465 {
466 .procname = "core_uses_pid",
467 .data = &core_uses_pid,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec,
471 },
472 {
473 .procname = "core_pattern",
474 .data = core_pattern,
475 .maxlen = CORENAME_MAX_SIZE,
476 .mode = 0644,
477 .proc_handler = proc_dostring_coredump,
478 },
479 {
480 .procname = "core_pipe_limit",
481 .data = &core_pipe_limit,
482 .maxlen = sizeof(unsigned int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 #endif
487 #ifdef CONFIG_PROC_SYSCTL
488 {
489 .procname = "tainted",
490 .maxlen = sizeof(long),
491 .mode = 0644,
492 .proc_handler = proc_taint,
493 },
494 #endif
495 #ifdef CONFIG_LATENCYTOP
496 {
497 .procname = "latencytop",
498 .data = &latencytop_enabled,
499 .maxlen = sizeof(int),
500 .mode = 0644,
501 .proc_handler = proc_dointvec,
502 },
503 #endif
504 #ifdef CONFIG_BLK_DEV_INITRD
505 {
506 .procname = "real-root-dev",
507 .data = &real_root_dev,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec,
511 },
512 #endif
513 {
514 .procname = "print-fatal-signals",
515 .data = &print_fatal_signals,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec,
519 },
520 #ifdef CONFIG_SPARC
521 {
522 .procname = "reboot-cmd",
523 .data = reboot_command,
524 .maxlen = 256,
525 .mode = 0644,
526 .proc_handler = proc_dostring,
527 },
528 {
529 .procname = "stop-a",
530 .data = &stop_a_enabled,
531 .maxlen = sizeof (int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec,
534 },
535 {
536 .procname = "scons-poweroff",
537 .data = &scons_pwroff,
538 .maxlen = sizeof (int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 #endif
543 #ifdef CONFIG_SPARC64
544 {
545 .procname = "tsb-ratio",
546 .data = &sysctl_tsb_ratio,
547 .maxlen = sizeof (int),
548 .mode = 0644,
549 .proc_handler = proc_dointvec,
550 },
551 #endif
552 #ifdef __hppa__
553 {
554 .procname = "soft-power",
555 .data = &pwrsw_enabled,
556 .maxlen = sizeof (int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec,
559 },
560 #endif
561 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
562 {
563 .procname = "unaligned-trap",
564 .data = &unaligned_enabled,
565 .maxlen = sizeof (int),
566 .mode = 0644,
567 .proc_handler = proc_dointvec,
568 },
569 #endif
570 {
571 .procname = "ctrl-alt-del",
572 .data = &C_A_D,
573 .maxlen = sizeof(int),
574 .mode = 0644,
575 .proc_handler = proc_dointvec,
576 },
577 #ifdef CONFIG_FUNCTION_TRACER
578 {
579 .procname = "ftrace_enabled",
580 .data = &ftrace_enabled,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = ftrace_enable_sysctl,
584 },
585 #endif
586 #ifdef CONFIG_STACK_TRACER
587 {
588 .procname = "stack_tracer_enabled",
589 .data = &stack_tracer_enabled,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = stack_trace_sysctl,
593 },
594 #endif
595 #ifdef CONFIG_TRACING
596 {
597 .procname = "ftrace_dump_on_oops",
598 .data = &ftrace_dump_on_oops,
599 .maxlen = sizeof(int),
600 .mode = 0644,
601 .proc_handler = proc_dointvec,
602 },
603 #endif
604 #ifdef CONFIG_MODULES
605 {
606 .procname = "modprobe",
607 .data = &modprobe_path,
608 .maxlen = KMOD_PATH_LEN,
609 .mode = 0644,
610 .proc_handler = proc_dostring,
611 },
612 {
613 .procname = "modules_disabled",
614 .data = &modules_disabled,
615 .maxlen = sizeof(int),
616 .mode = 0644,
617 /* only handle a transition from default "0" to "1" */
618 .proc_handler = proc_dointvec_minmax,
619 .extra1 = &one,
620 .extra2 = &one,
621 },
622 #endif
623
624 {
625 .procname = "hotplug",
626 .data = &uevent_helper,
627 .maxlen = UEVENT_HELPER_PATH_LEN,
628 .mode = 0644,
629 .proc_handler = proc_dostring,
630 },
631
632 #ifdef CONFIG_CHR_DEV_SG
633 {
634 .procname = "sg-big-buff",
635 .data = &sg_big_buff,
636 .maxlen = sizeof (int),
637 .mode = 0444,
638 .proc_handler = proc_dointvec,
639 },
640 #endif
641 #ifdef CONFIG_BSD_PROCESS_ACCT
642 {
643 .procname = "acct",
644 .data = &acct_parm,
645 .maxlen = 3*sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec,
648 },
649 #endif
650 #ifdef CONFIG_MAGIC_SYSRQ
651 {
652 .procname = "sysrq",
653 .data = &__sysrq_enabled,
654 .maxlen = sizeof (int),
655 .mode = 0644,
656 .proc_handler = sysrq_sysctl_handler,
657 },
658 #endif
659 #ifdef CONFIG_PROC_SYSCTL
660 {
661 .procname = "cad_pid",
662 .data = NULL,
663 .maxlen = sizeof (int),
664 .mode = 0600,
665 .proc_handler = proc_do_cad_pid,
666 },
667 #endif
668 {
669 .procname = "threads-max",
670 .data = &max_threads,
671 .maxlen = sizeof(int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec,
674 },
675 {
676 .procname = "random",
677 .mode = 0555,
678 .child = random_table,
679 },
680 {
681 .procname = "usermodehelper",
682 .mode = 0555,
683 .child = usermodehelper_table,
684 },
685 {
686 .procname = "overflowuid",
687 .data = &overflowuid,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec_minmax,
691 .extra1 = &minolduid,
692 .extra2 = &maxolduid,
693 },
694 {
695 .procname = "overflowgid",
696 .data = &overflowgid,
697 .maxlen = sizeof(int),
698 .mode = 0644,
699 .proc_handler = proc_dointvec_minmax,
700 .extra1 = &minolduid,
701 .extra2 = &maxolduid,
702 },
703 #ifdef CONFIG_S390
704 #ifdef CONFIG_MATHEMU
705 {
706 .procname = "ieee_emulation_warnings",
707 .data = &sysctl_ieee_emulation_warnings,
708 .maxlen = sizeof(int),
709 .mode = 0644,
710 .proc_handler = proc_dointvec,
711 },
712 #endif
713 {
714 .procname = "userprocess_debug",
715 .data = &show_unhandled_signals,
716 .maxlen = sizeof(int),
717 .mode = 0644,
718 .proc_handler = proc_dointvec,
719 },
720 #endif
721 {
722 .procname = "pid_max",
723 .data = &pid_max,
724 .maxlen = sizeof (int),
725 .mode = 0644,
726 .proc_handler = proc_dointvec_minmax,
727 .extra1 = &pid_max_min,
728 .extra2 = &pid_max_max,
729 },
730 {
731 .procname = "panic_on_oops",
732 .data = &panic_on_oops,
733 .maxlen = sizeof(int),
734 .mode = 0644,
735 .proc_handler = proc_dointvec,
736 },
737 #if defined CONFIG_PRINTK
738 {
739 .procname = "printk",
740 .data = &console_loglevel,
741 .maxlen = 4*sizeof(int),
742 .mode = 0644,
743 .proc_handler = proc_dointvec,
744 },
745 {
746 .procname = "printk_ratelimit",
747 .data = &printk_ratelimit_state.interval,
748 .maxlen = sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec_jiffies,
751 },
752 {
753 .procname = "printk_ratelimit_burst",
754 .data = &printk_ratelimit_state.burst,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec,
758 },
759 {
760 .procname = "printk_delay",
761 .data = &printk_delay_msec,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec_minmax,
765 .extra1 = &zero,
766 .extra2 = &ten_thousand,
767 },
768 {
769 .procname = "dmesg_restrict",
770 .data = &dmesg_restrict,
771 .maxlen = sizeof(int),
772 .mode = 0644,
773 .proc_handler = proc_dointvec_minmax_sysadmin,
774 .extra1 = &zero,
775 .extra2 = &one,
776 },
777 {
778 .procname = "kptr_restrict",
779 .data = &kptr_restrict,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec_minmax_sysadmin,
783 .extra1 = &zero,
784 .extra2 = &two,
785 },
786 #endif
787 {
788 .procname = "ngroups_max",
789 .data = &ngroups_max,
790 .maxlen = sizeof (int),
791 .mode = 0444,
792 .proc_handler = proc_dointvec,
793 },
794 {
795 .procname = "cap_last_cap",
796 .data = (void *)&cap_last_cap,
797 .maxlen = sizeof(int),
798 .mode = 0444,
799 .proc_handler = proc_dointvec,
800 },
801 #if defined(CONFIG_LOCKUP_DETECTOR)
802 {
803 .procname = "watchdog",
804 .data = &watchdog_enabled,
805 .maxlen = sizeof (int),
806 .mode = 0644,
807 .proc_handler = proc_dowatchdog,
808 .extra1 = &zero,
809 .extra2 = &one,
810 },
811 {
812 .procname = "watchdog_thresh",
813 .data = &watchdog_thresh,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dowatchdog,
817 .extra1 = &neg_one,
818 .extra2 = &sixty,
819 },
820 {
821 .procname = "softlockup_panic",
822 .data = &softlockup_panic,
823 .maxlen = sizeof(int),
824 .mode = 0644,
825 .proc_handler = proc_dointvec_minmax,
826 .extra1 = &zero,
827 .extra2 = &one,
828 },
829 {
830 .procname = "nmi_watchdog",
831 .data = &watchdog_enabled,
832 .maxlen = sizeof (int),
833 .mode = 0644,
834 .proc_handler = proc_dowatchdog,
835 .extra1 = &zero,
836 .extra2 = &one,
837 },
838 #endif
839 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
840 {
841 .procname = "unknown_nmi_panic",
842 .data = &unknown_nmi_panic,
843 .maxlen = sizeof (int),
844 .mode = 0644,
845 .proc_handler = proc_dointvec,
846 },
847 #endif
848 #if defined(CONFIG_X86)
849 {
850 .procname = "panic_on_unrecovered_nmi",
851 .data = &panic_on_unrecovered_nmi,
852 .maxlen = sizeof(int),
853 .mode = 0644,
854 .proc_handler = proc_dointvec,
855 },
856 {
857 .procname = "panic_on_io_nmi",
858 .data = &panic_on_io_nmi,
859 .maxlen = sizeof(int),
860 .mode = 0644,
861 .proc_handler = proc_dointvec,
862 },
863 #ifdef CONFIG_DEBUG_STACKOVERFLOW
864 {
865 .procname = "panic_on_stackoverflow",
866 .data = &sysctl_panic_on_stackoverflow,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = proc_dointvec,
870 },
871 #endif
872 {
873 .procname = "bootloader_type",
874 .data = &bootloader_type,
875 .maxlen = sizeof (int),
876 .mode = 0444,
877 .proc_handler = proc_dointvec,
878 },
879 {
880 .procname = "bootloader_version",
881 .data = &bootloader_version,
882 .maxlen = sizeof (int),
883 .mode = 0444,
884 .proc_handler = proc_dointvec,
885 },
886 {
887 .procname = "kstack_depth_to_print",
888 .data = &kstack_depth_to_print,
889 .maxlen = sizeof(int),
890 .mode = 0644,
891 .proc_handler = proc_dointvec,
892 },
893 {
894 .procname = "io_delay_type",
895 .data = &io_delay_type,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec,
899 },
900 #endif
901 #if defined(CONFIG_MMU)
902 {
903 .procname = "randomize_va_space",
904 .data = &randomize_va_space,
905 .maxlen = sizeof(int),
906 .mode = 0644,
907 .proc_handler = proc_dointvec,
908 },
909 #endif
910 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
911 {
912 .procname = "spin_retry",
913 .data = &spin_retry,
914 .maxlen = sizeof (int),
915 .mode = 0644,
916 .proc_handler = proc_dointvec,
917 },
918 #endif
919 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
920 {
921 .procname = "acpi_video_flags",
922 .data = &acpi_realmode_flags,
923 .maxlen = sizeof (unsigned long),
924 .mode = 0644,
925 .proc_handler = proc_doulongvec_minmax,
926 },
927 #endif
928 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
929 {
930 .procname = "ignore-unaligned-usertrap",
931 .data = &no_unaligned_warning,
932 .maxlen = sizeof (int),
933 .mode = 0644,
934 .proc_handler = proc_dointvec,
935 },
936 #endif
937 #ifdef CONFIG_IA64
938 {
939 .procname = "unaligned-dump-stack",
940 .data = &unaligned_dump_stack,
941 .maxlen = sizeof (int),
942 .mode = 0644,
943 .proc_handler = proc_dointvec,
944 },
945 #endif
946 #ifdef CONFIG_DETECT_HUNG_TASK
947 {
948 .procname = "hung_task_panic",
949 .data = &sysctl_hung_task_panic,
950 .maxlen = sizeof(int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec_minmax,
953 .extra1 = &zero,
954 .extra2 = &one,
955 },
956 {
957 .procname = "hung_task_check_count",
958 .data = &sysctl_hung_task_check_count,
959 .maxlen = sizeof(unsigned long),
960 .mode = 0644,
961 .proc_handler = proc_doulongvec_minmax,
962 },
963 {
964 .procname = "hung_task_timeout_secs",
965 .data = &sysctl_hung_task_timeout_secs,
966 .maxlen = sizeof(unsigned long),
967 .mode = 0644,
968 .proc_handler = proc_dohung_task_timeout_secs,
969 },
970 {
971 .procname = "hung_task_warnings",
972 .data = &sysctl_hung_task_warnings,
973 .maxlen = sizeof(unsigned long),
974 .mode = 0644,
975 .proc_handler = proc_doulongvec_minmax,
976 },
977 #endif
978 #ifdef CONFIG_COMPAT
979 {
980 .procname = "compat-log",
981 .data = &compat_log,
982 .maxlen = sizeof (int),
983 .mode = 0644,
984 .proc_handler = proc_dointvec,
985 },
986 #endif
987 #ifdef CONFIG_RT_MUTEXES
988 {
989 .procname = "max_lock_depth",
990 .data = &max_lock_depth,
991 .maxlen = sizeof(int),
992 .mode = 0644,
993 .proc_handler = proc_dointvec,
994 },
995 #endif
996 {
997 .procname = "poweroff_cmd",
998 .data = &poweroff_cmd,
999 .maxlen = POWEROFF_CMD_PATH_LEN,
1000 .mode = 0644,
1001 .proc_handler = proc_dostring,
1002 },
1003 #ifdef CONFIG_KEYS
1004 {
1005 .procname = "keys",
1006 .mode = 0555,
1007 .child = key_sysctls,
1008 },
1009 #endif
1010 #ifdef CONFIG_RCU_TORTURE_TEST
1011 {
1012 .procname = "rcutorture_runnable",
1013 .data = &rcutorture_runnable,
1014 .maxlen = sizeof(int),
1015 .mode = 0644,
1016 .proc_handler = proc_dointvec,
1017 },
1018 #endif
1019 #ifdef CONFIG_PERF_EVENTS
1020 /*
1021 * User-space scripts rely on the existence of this file
1022 * as a feature check for perf_events being enabled.
1023 *
1024 * So it's an ABI, do not remove!
1025 */
1026 {
1027 .procname = "perf_event_paranoid",
1028 .data = &sysctl_perf_event_paranoid,
1029 .maxlen = sizeof(sysctl_perf_event_paranoid),
1030 .mode = 0644,
1031 .proc_handler = proc_dointvec,
1032 },
1033 {
1034 .procname = "perf_event_mlock_kb",
1035 .data = &sysctl_perf_event_mlock,
1036 .maxlen = sizeof(sysctl_perf_event_mlock),
1037 .mode = 0644,
1038 .proc_handler = proc_dointvec,
1039 },
1040 {
1041 .procname = "perf_event_max_sample_rate",
1042 .data = &sysctl_perf_event_sample_rate,
1043 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1044 .mode = 0644,
1045 .proc_handler = perf_proc_update_handler,
1046 },
1047 #endif
1048 #ifdef CONFIG_KMEMCHECK
1049 {
1050 .procname = "kmemcheck",
1051 .data = &kmemcheck_enabled,
1052 .maxlen = sizeof(int),
1053 .mode = 0644,
1054 .proc_handler = proc_dointvec,
1055 },
1056 #endif
1057 #ifdef CONFIG_BLOCK
1058 {
1059 .procname = "blk_iopoll",
1060 .data = &blk_iopoll_enabled,
1061 .maxlen = sizeof(int),
1062 .mode = 0644,
1063 .proc_handler = proc_dointvec,
1064 },
1065 #endif
1066 { }
1067 };
1068
1069 static struct ctl_table vm_table[] = {
1070 {
1071 .procname = "overcommit_memory",
1072 .data = &sysctl_overcommit_memory,
1073 .maxlen = sizeof(sysctl_overcommit_memory),
1074 .mode = 0644,
1075 .proc_handler = proc_dointvec_minmax,
1076 .extra1 = &zero,
1077 .extra2 = &two,
1078 },
1079 {
1080 .procname = "panic_on_oom",
1081 .data = &sysctl_panic_on_oom,
1082 .maxlen = sizeof(sysctl_panic_on_oom),
1083 .mode = 0644,
1084 .proc_handler = proc_dointvec_minmax,
1085 .extra1 = &zero,
1086 .extra2 = &two,
1087 },
1088 {
1089 .procname = "oom_kill_allocating_task",
1090 .data = &sysctl_oom_kill_allocating_task,
1091 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1092 .mode = 0644,
1093 .proc_handler = proc_dointvec,
1094 },
1095 {
1096 .procname = "oom_dump_tasks",
1097 .data = &sysctl_oom_dump_tasks,
1098 .maxlen = sizeof(sysctl_oom_dump_tasks),
1099 .mode = 0644,
1100 .proc_handler = proc_dointvec,
1101 },
1102 {
1103 .procname = "overcommit_ratio",
1104 .data = &sysctl_overcommit_ratio,
1105 .maxlen = sizeof(sysctl_overcommit_ratio),
1106 .mode = 0644,
1107 .proc_handler = proc_dointvec,
1108 },
1109 {
1110 .procname = "page-cluster",
1111 .data = &page_cluster,
1112 .maxlen = sizeof(int),
1113 .mode = 0644,
1114 .proc_handler = proc_dointvec_minmax,
1115 .extra1 = &zero,
1116 },
1117 {
1118 .procname = "dirty_background_ratio",
1119 .data = &dirty_background_ratio,
1120 .maxlen = sizeof(dirty_background_ratio),
1121 .mode = 0644,
1122 .proc_handler = dirty_background_ratio_handler,
1123 .extra1 = &zero,
1124 .extra2 = &one_hundred,
1125 },
1126 {
1127 .procname = "dirty_background_bytes",
1128 .data = &dirty_background_bytes,
1129 .maxlen = sizeof(dirty_background_bytes),
1130 .mode = 0644,
1131 .proc_handler = dirty_background_bytes_handler,
1132 .extra1 = &one_ul,
1133 },
1134 {
1135 .procname = "dirty_ratio",
1136 .data = &vm_dirty_ratio,
1137 .maxlen = sizeof(vm_dirty_ratio),
1138 .mode = 0644,
1139 .proc_handler = dirty_ratio_handler,
1140 .extra1 = &zero,
1141 .extra2 = &one_hundred,
1142 },
1143 {
1144 .procname = "dirty_bytes",
1145 .data = &vm_dirty_bytes,
1146 .maxlen = sizeof(vm_dirty_bytes),
1147 .mode = 0644,
1148 .proc_handler = dirty_bytes_handler,
1149 .extra1 = &dirty_bytes_min,
1150 },
1151 {
1152 .procname = "dirty_writeback_centisecs",
1153 .data = &dirty_writeback_interval,
1154 .maxlen = sizeof(dirty_writeback_interval),
1155 .mode = 0644,
1156 .proc_handler = dirty_writeback_centisecs_handler,
1157 },
1158 {
1159 .procname = "dirty_expire_centisecs",
1160 .data = &dirty_expire_interval,
1161 .maxlen = sizeof(dirty_expire_interval),
1162 .mode = 0644,
1163 .proc_handler = proc_dointvec_minmax,
1164 .extra1 = &zero,
1165 },
1166 {
1167 .procname = "nr_pdflush_threads",
1168 .mode = 0444 /* read-only */,
1169 .proc_handler = pdflush_proc_obsolete,
1170 },
1171 {
1172 .procname = "swappiness",
1173 .data = &vm_swappiness,
1174 .maxlen = sizeof(vm_swappiness),
1175 .mode = 0644,
1176 .proc_handler = proc_dointvec_minmax,
1177 .extra1 = &zero,
1178 .extra2 = &one_hundred,
1179 },
1180 #ifdef CONFIG_HUGETLB_PAGE
1181 {
1182 .procname = "nr_hugepages",
1183 .data = NULL,
1184 .maxlen = sizeof(unsigned long),
1185 .mode = 0644,
1186 .proc_handler = hugetlb_sysctl_handler,
1187 .extra1 = (void *)&hugetlb_zero,
1188 .extra2 = (void *)&hugetlb_infinity,
1189 },
1190 #ifdef CONFIG_NUMA
1191 {
1192 .procname = "nr_hugepages_mempolicy",
1193 .data = NULL,
1194 .maxlen = sizeof(unsigned long),
1195 .mode = 0644,
1196 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1197 .extra1 = (void *)&hugetlb_zero,
1198 .extra2 = (void *)&hugetlb_infinity,
1199 },
1200 #endif
1201 {
1202 .procname = "hugetlb_shm_group",
1203 .data = &sysctl_hugetlb_shm_group,
1204 .maxlen = sizeof(gid_t),
1205 .mode = 0644,
1206 .proc_handler = proc_dointvec,
1207 },
1208 {
1209 .procname = "hugepages_treat_as_movable",
1210 .data = &hugepages_treat_as_movable,
1211 .maxlen = sizeof(int),
1212 .mode = 0644,
1213 .proc_handler = hugetlb_treat_movable_handler,
1214 },
1215 {
1216 .procname = "nr_overcommit_hugepages",
1217 .data = NULL,
1218 .maxlen = sizeof(unsigned long),
1219 .mode = 0644,
1220 .proc_handler = hugetlb_overcommit_handler,
1221 .extra1 = (void *)&hugetlb_zero,
1222 .extra2 = (void *)&hugetlb_infinity,
1223 },
1224 #endif
1225 {
1226 .procname = "lowmem_reserve_ratio",
1227 .data = &sysctl_lowmem_reserve_ratio,
1228 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1229 .mode = 0644,
1230 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1231 },
1232 {
1233 .procname = "drop_caches",
1234 .data = &sysctl_drop_caches,
1235 .maxlen = sizeof(int),
1236 .mode = 0644,
1237 .proc_handler = drop_caches_sysctl_handler,
1238 .extra1 = &one,
1239 .extra2 = &three,
1240 },
1241 #ifdef CONFIG_COMPACTION
1242 {
1243 .procname = "compact_memory",
1244 .data = &sysctl_compact_memory,
1245 .maxlen = sizeof(int),
1246 .mode = 0200,
1247 .proc_handler = sysctl_compaction_handler,
1248 },
1249 {
1250 .procname = "extfrag_threshold",
1251 .data = &sysctl_extfrag_threshold,
1252 .maxlen = sizeof(int),
1253 .mode = 0644,
1254 .proc_handler = sysctl_extfrag_handler,
1255 .extra1 = &min_extfrag_threshold,
1256 .extra2 = &max_extfrag_threshold,
1257 },
1258
1259 #endif /* CONFIG_COMPACTION */
1260 {
1261 .procname = "min_free_kbytes",
1262 .data = &min_free_kbytes,
1263 .maxlen = sizeof(min_free_kbytes),
1264 .mode = 0644,
1265 .proc_handler = min_free_kbytes_sysctl_handler,
1266 .extra1 = &zero,
1267 },
1268 {
1269 .procname = "percpu_pagelist_fraction",
1270 .data = &percpu_pagelist_fraction,
1271 .maxlen = sizeof(percpu_pagelist_fraction),
1272 .mode = 0644,
1273 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1274 .extra1 = &min_percpu_pagelist_fract,
1275 },
1276 #ifdef CONFIG_MMU
1277 {
1278 .procname = "max_map_count",
1279 .data = &sysctl_max_map_count,
1280 .maxlen = sizeof(sysctl_max_map_count),
1281 .mode = 0644,
1282 .proc_handler = proc_dointvec_minmax,
1283 .extra1 = &zero,
1284 },
1285 #else
1286 {
1287 .procname = "nr_trim_pages",
1288 .data = &sysctl_nr_trim_pages,
1289 .maxlen = sizeof(sysctl_nr_trim_pages),
1290 .mode = 0644,
1291 .proc_handler = proc_dointvec_minmax,
1292 .extra1 = &zero,
1293 },
1294 #endif
1295 {
1296 .procname = "laptop_mode",
1297 .data = &laptop_mode,
1298 .maxlen = sizeof(laptop_mode),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec_jiffies,
1301 },
1302 {
1303 .procname = "block_dump",
1304 .data = &block_dump,
1305 .maxlen = sizeof(block_dump),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec,
1308 .extra1 = &zero,
1309 },
1310 {
1311 .procname = "vfs_cache_pressure",
1312 .data = &sysctl_vfs_cache_pressure,
1313 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1314 .mode = 0644,
1315 .proc_handler = proc_dointvec,
1316 .extra1 = &zero,
1317 },
1318 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1319 {
1320 .procname = "legacy_va_layout",
1321 .data = &sysctl_legacy_va_layout,
1322 .maxlen = sizeof(sysctl_legacy_va_layout),
1323 .mode = 0644,
1324 .proc_handler = proc_dointvec,
1325 .extra1 = &zero,
1326 },
1327 #endif
1328 #ifdef CONFIG_NUMA
1329 {
1330 .procname = "zone_reclaim_mode",
1331 .data = &zone_reclaim_mode,
1332 .maxlen = sizeof(zone_reclaim_mode),
1333 .mode = 0644,
1334 .proc_handler = proc_dointvec,
1335 .extra1 = &zero,
1336 },
1337 {
1338 .procname = "min_unmapped_ratio",
1339 .data = &sysctl_min_unmapped_ratio,
1340 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1341 .mode = 0644,
1342 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1343 .extra1 = &zero,
1344 .extra2 = &one_hundred,
1345 },
1346 {
1347 .procname = "min_slab_ratio",
1348 .data = &sysctl_min_slab_ratio,
1349 .maxlen = sizeof(sysctl_min_slab_ratio),
1350 .mode = 0644,
1351 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1352 .extra1 = &zero,
1353 .extra2 = &one_hundred,
1354 },
1355 #endif
1356 #ifdef CONFIG_SMP
1357 {
1358 .procname = "stat_interval",
1359 .data = &sysctl_stat_interval,
1360 .maxlen = sizeof(sysctl_stat_interval),
1361 .mode = 0644,
1362 .proc_handler = proc_dointvec_jiffies,
1363 },
1364 #endif
1365 #ifdef CONFIG_MMU
1366 {
1367 .procname = "mmap_min_addr",
1368 .data = &dac_mmap_min_addr,
1369 .maxlen = sizeof(unsigned long),
1370 .mode = 0644,
1371 .proc_handler = mmap_min_addr_handler,
1372 },
1373 #endif
1374 #ifdef CONFIG_NUMA
1375 {
1376 .procname = "numa_zonelist_order",
1377 .data = &numa_zonelist_order,
1378 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1379 .mode = 0644,
1380 .proc_handler = numa_zonelist_order_handler,
1381 },
1382 #endif
1383 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1384 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1385 {
1386 .procname = "vdso_enabled",
1387 .data = &vdso_enabled,
1388 .maxlen = sizeof(vdso_enabled),
1389 .mode = 0644,
1390 .proc_handler = proc_dointvec,
1391 .extra1 = &zero,
1392 },
1393 #endif
1394 #ifdef CONFIG_HIGHMEM
1395 {
1396 .procname = "highmem_is_dirtyable",
1397 .data = &vm_highmem_is_dirtyable,
1398 .maxlen = sizeof(vm_highmem_is_dirtyable),
1399 .mode = 0644,
1400 .proc_handler = proc_dointvec_minmax,
1401 .extra1 = &zero,
1402 .extra2 = &one,
1403 },
1404 #endif
1405 {
1406 .procname = "scan_unevictable_pages",
1407 .data = &scan_unevictable_pages,
1408 .maxlen = sizeof(scan_unevictable_pages),
1409 .mode = 0644,
1410 .proc_handler = scan_unevictable_handler,
1411 },
1412 #ifdef CONFIG_MEMORY_FAILURE
1413 {
1414 .procname = "memory_failure_early_kill",
1415 .data = &sysctl_memory_failure_early_kill,
1416 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1417 .mode = 0644,
1418 .proc_handler = proc_dointvec_minmax,
1419 .extra1 = &zero,
1420 .extra2 = &one,
1421 },
1422 {
1423 .procname = "memory_failure_recovery",
1424 .data = &sysctl_memory_failure_recovery,
1425 .maxlen = sizeof(sysctl_memory_failure_recovery),
1426 .mode = 0644,
1427 .proc_handler = proc_dointvec_minmax,
1428 .extra1 = &zero,
1429 .extra2 = &one,
1430 },
1431 #endif
1432 { }
1433 };
1434
1435 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1436 static struct ctl_table binfmt_misc_table[] = {
1437 { }
1438 };
1439 #endif
1440
1441 static struct ctl_table fs_table[] = {
1442 {
1443 .procname = "inode-nr",
1444 .data = &inodes_stat,
1445 .maxlen = 2*sizeof(int),
1446 .mode = 0444,
1447 .proc_handler = proc_nr_inodes,
1448 },
1449 {
1450 .procname = "inode-state",
1451 .data = &inodes_stat,
1452 .maxlen = 7*sizeof(int),
1453 .mode = 0444,
1454 .proc_handler = proc_nr_inodes,
1455 },
1456 {
1457 .procname = "file-nr",
1458 .data = &files_stat,
1459 .maxlen = sizeof(files_stat),
1460 .mode = 0444,
1461 .proc_handler = proc_nr_files,
1462 },
1463 {
1464 .procname = "file-max",
1465 .data = &files_stat.max_files,
1466 .maxlen = sizeof(files_stat.max_files),
1467 .mode = 0644,
1468 .proc_handler = proc_doulongvec_minmax,
1469 },
1470 {
1471 .procname = "nr_open",
1472 .data = &sysctl_nr_open,
1473 .maxlen = sizeof(int),
1474 .mode = 0644,
1475 .proc_handler = proc_dointvec_minmax,
1476 .extra1 = &sysctl_nr_open_min,
1477 .extra2 = &sysctl_nr_open_max,
1478 },
1479 {
1480 .procname = "dentry-state",
1481 .data = &dentry_stat,
1482 .maxlen = 6*sizeof(int),
1483 .mode = 0444,
1484 .proc_handler = proc_nr_dentry,
1485 },
1486 {
1487 .procname = "overflowuid",
1488 .data = &fs_overflowuid,
1489 .maxlen = sizeof(int),
1490 .mode = 0644,
1491 .proc_handler = proc_dointvec_minmax,
1492 .extra1 = &minolduid,
1493 .extra2 = &maxolduid,
1494 },
1495 {
1496 .procname = "overflowgid",
1497 .data = &fs_overflowgid,
1498 .maxlen = sizeof(int),
1499 .mode = 0644,
1500 .proc_handler = proc_dointvec_minmax,
1501 .extra1 = &minolduid,
1502 .extra2 = &maxolduid,
1503 },
1504 #ifdef CONFIG_FILE_LOCKING
1505 {
1506 .procname = "leases-enable",
1507 .data = &leases_enable,
1508 .maxlen = sizeof(int),
1509 .mode = 0644,
1510 .proc_handler = proc_dointvec,
1511 },
1512 #endif
1513 #ifdef CONFIG_DNOTIFY
1514 {
1515 .procname = "dir-notify-enable",
1516 .data = &dir_notify_enable,
1517 .maxlen = sizeof(int),
1518 .mode = 0644,
1519 .proc_handler = proc_dointvec,
1520 },
1521 #endif
1522 #ifdef CONFIG_MMU
1523 #ifdef CONFIG_FILE_LOCKING
1524 {
1525 .procname = "lease-break-time",
1526 .data = &lease_break_time,
1527 .maxlen = sizeof(int),
1528 .mode = 0644,
1529 .proc_handler = proc_dointvec,
1530 },
1531 #endif
1532 #ifdef CONFIG_AIO
1533 {
1534 .procname = "aio-nr",
1535 .data = &aio_nr,
1536 .maxlen = sizeof(aio_nr),
1537 .mode = 0444,
1538 .proc_handler = proc_doulongvec_minmax,
1539 },
1540 {
1541 .procname = "aio-max-nr",
1542 .data = &aio_max_nr,
1543 .maxlen = sizeof(aio_max_nr),
1544 .mode = 0644,
1545 .proc_handler = proc_doulongvec_minmax,
1546 },
1547 #endif /* CONFIG_AIO */
1548 #ifdef CONFIG_INOTIFY_USER
1549 {
1550 .procname = "inotify",
1551 .mode = 0555,
1552 .child = inotify_table,
1553 },
1554 #endif
1555 #ifdef CONFIG_EPOLL
1556 {
1557 .procname = "epoll",
1558 .mode = 0555,
1559 .child = epoll_table,
1560 },
1561 #endif
1562 #endif
1563 {
1564 .procname = "protected_symlinks",
1565 .data = &sysctl_protected_symlinks,
1566 .maxlen = sizeof(int),
1567 .mode = 0600,
1568 .proc_handler = proc_dointvec_minmax,
1569 .extra1 = &zero,
1570 .extra2 = &one,
1571 },
1572 {
1573 .procname = "protected_hardlinks",
1574 .data = &sysctl_protected_hardlinks,
1575 .maxlen = sizeof(int),
1576 .mode = 0600,
1577 .proc_handler = proc_dointvec_minmax,
1578 .extra1 = &zero,
1579 .extra2 = &one,
1580 },
1581 {
1582 .procname = "suid_dumpable",
1583 .data = &suid_dumpable,
1584 .maxlen = sizeof(int),
1585 .mode = 0644,
1586 .proc_handler = proc_dointvec_minmax_coredump,
1587 .extra1 = &zero,
1588 .extra2 = &two,
1589 },
1590 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1591 {
1592 .procname = "binfmt_misc",
1593 .mode = 0555,
1594 .child = binfmt_misc_table,
1595 },
1596 #endif
1597 {
1598 .procname = "pipe-max-size",
1599 .data = &pipe_max_size,
1600 .maxlen = sizeof(int),
1601 .mode = 0644,
1602 .proc_handler = &pipe_proc_fn,
1603 .extra1 = &pipe_min_size,
1604 },
1605 { }
1606 };
1607
1608 static struct ctl_table debug_table[] = {
1609 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1610 {
1611 .procname = "exception-trace",
1612 .data = &show_unhandled_signals,
1613 .maxlen = sizeof(int),
1614 .mode = 0644,
1615 .proc_handler = proc_dointvec
1616 },
1617 #endif
1618 #if defined(CONFIG_OPTPROBES)
1619 {
1620 .procname = "kprobes-optimization",
1621 .data = &sysctl_kprobes_optimization,
1622 .maxlen = sizeof(int),
1623 .mode = 0644,
1624 .proc_handler = proc_kprobes_optimization_handler,
1625 .extra1 = &zero,
1626 .extra2 = &one,
1627 },
1628 #endif
1629 { }
1630 };
1631
1632 static struct ctl_table dev_table[] = {
1633 { }
1634 };
1635
1636 int __init sysctl_init(void)
1637 {
1638 struct ctl_table_header *hdr;
1639
1640 hdr = register_sysctl_table(sysctl_base_table);
1641 kmemleak_not_leak(hdr);
1642 return 0;
1643 }
1644
1645 #endif /* CONFIG_SYSCTL */
1646
1647 /*
1648 * /proc/sys support
1649 */
1650
1651 #ifdef CONFIG_PROC_SYSCTL
1652
1653 static int _proc_do_string(void* data, int maxlen, int write,
1654 void __user *buffer,
1655 size_t *lenp, loff_t *ppos)
1656 {
1657 size_t len;
1658 char __user *p;
1659 char c;
1660
1661 if (!data || !maxlen || !*lenp) {
1662 *lenp = 0;
1663 return 0;
1664 }
1665
1666 if (write) {
1667 len = 0;
1668 p = buffer;
1669 while (len < *lenp) {
1670 if (get_user(c, p++))
1671 return -EFAULT;
1672 if (c == 0 || c == '\n')
1673 break;
1674 len++;
1675 }
1676 if (len >= maxlen)
1677 len = maxlen-1;
1678 if(copy_from_user(data, buffer, len))
1679 return -EFAULT;
1680 ((char *) data)[len] = 0;
1681 *ppos += *lenp;
1682 } else {
1683 len = strlen(data);
1684 if (len > maxlen)
1685 len = maxlen;
1686
1687 if (*ppos > len) {
1688 *lenp = 0;
1689 return 0;
1690 }
1691
1692 data += *ppos;
1693 len -= *ppos;
1694
1695 if (len > *lenp)
1696 len = *lenp;
1697 if (len)
1698 if(copy_to_user(buffer, data, len))
1699 return -EFAULT;
1700 if (len < *lenp) {
1701 if(put_user('\n', ((char __user *) buffer) + len))
1702 return -EFAULT;
1703 len++;
1704 }
1705 *lenp = len;
1706 *ppos += len;
1707 }
1708 return 0;
1709 }
1710
1711 /**
1712 * proc_dostring - read a string sysctl
1713 * @table: the sysctl table
1714 * @write: %TRUE if this is a write to the sysctl file
1715 * @buffer: the user buffer
1716 * @lenp: the size of the user buffer
1717 * @ppos: file position
1718 *
1719 * Reads/writes a string from/to the user buffer. If the kernel
1720 * buffer provided is not large enough to hold the string, the
1721 * string is truncated. The copied string is %NULL-terminated.
1722 * If the string is being read by the user process, it is copied
1723 * and a newline '\n' is added. It is truncated if the buffer is
1724 * not large enough.
1725 *
1726 * Returns 0 on success.
1727 */
1728 int proc_dostring(struct ctl_table *table, int write,
1729 void __user *buffer, size_t *lenp, loff_t *ppos)
1730 {
1731 return _proc_do_string(table->data, table->maxlen, write,
1732 buffer, lenp, ppos);
1733 }
1734
1735 static size_t proc_skip_spaces(char **buf)
1736 {
1737 size_t ret;
1738 char *tmp = skip_spaces(*buf);
1739 ret = tmp - *buf;
1740 *buf = tmp;
1741 return ret;
1742 }
1743
1744 static void proc_skip_char(char **buf, size_t *size, const char v)
1745 {
1746 while (*size) {
1747 if (**buf != v)
1748 break;
1749 (*size)--;
1750 (*buf)++;
1751 }
1752 }
1753
1754 #define TMPBUFLEN 22
1755 /**
1756 * proc_get_long - reads an ASCII formatted integer from a user buffer
1757 *
1758 * @buf: a kernel buffer
1759 * @size: size of the kernel buffer
1760 * @val: this is where the number will be stored
1761 * @neg: set to %TRUE if number is negative
1762 * @perm_tr: a vector which contains the allowed trailers
1763 * @perm_tr_len: size of the perm_tr vector
1764 * @tr: pointer to store the trailer character
1765 *
1766 * In case of success %0 is returned and @buf and @size are updated with
1767 * the amount of bytes read. If @tr is non-NULL and a trailing
1768 * character exists (size is non-zero after returning from this
1769 * function), @tr is updated with the trailing character.
1770 */
1771 static int proc_get_long(char **buf, size_t *size,
1772 unsigned long *val, bool *neg,
1773 const char *perm_tr, unsigned perm_tr_len, char *tr)
1774 {
1775 int len;
1776 char *p, tmp[TMPBUFLEN];
1777
1778 if (!*size)
1779 return -EINVAL;
1780
1781 len = *size;
1782 if (len > TMPBUFLEN - 1)
1783 len = TMPBUFLEN - 1;
1784
1785 memcpy(tmp, *buf, len);
1786
1787 tmp[len] = 0;
1788 p = tmp;
1789 if (*p == '-' && *size > 1) {
1790 *neg = true;
1791 p++;
1792 } else
1793 *neg = false;
1794 if (!isdigit(*p))
1795 return -EINVAL;
1796
1797 *val = simple_strtoul(p, &p, 0);
1798
1799 len = p - tmp;
1800
1801 /* We don't know if the next char is whitespace thus we may accept
1802 * invalid integers (e.g. 1234...a) or two integers instead of one
1803 * (e.g. 123...1). So lets not allow such large numbers. */
1804 if (len == TMPBUFLEN - 1)
1805 return -EINVAL;
1806
1807 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1808 return -EINVAL;
1809
1810 if (tr && (len < *size))
1811 *tr = *p;
1812
1813 *buf += len;
1814 *size -= len;
1815
1816 return 0;
1817 }
1818
1819 /**
1820 * proc_put_long - converts an integer to a decimal ASCII formatted string
1821 *
1822 * @buf: the user buffer
1823 * @size: the size of the user buffer
1824 * @val: the integer to be converted
1825 * @neg: sign of the number, %TRUE for negative
1826 *
1827 * In case of success %0 is returned and @buf and @size are updated with
1828 * the amount of bytes written.
1829 */
1830 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1831 bool neg)
1832 {
1833 int len;
1834 char tmp[TMPBUFLEN], *p = tmp;
1835
1836 sprintf(p, "%s%lu", neg ? "-" : "", val);
1837 len = strlen(tmp);
1838 if (len > *size)
1839 len = *size;
1840 if (copy_to_user(*buf, tmp, len))
1841 return -EFAULT;
1842 *size -= len;
1843 *buf += len;
1844 return 0;
1845 }
1846 #undef TMPBUFLEN
1847
1848 static int proc_put_char(void __user **buf, size_t *size, char c)
1849 {
1850 if (*size) {
1851 char __user **buffer = (char __user **)buf;
1852 if (put_user(c, *buffer))
1853 return -EFAULT;
1854 (*size)--, (*buffer)++;
1855 *buf = *buffer;
1856 }
1857 return 0;
1858 }
1859
1860 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1861 int *valp,
1862 int write, void *data)
1863 {
1864 if (write) {
1865 *valp = *negp ? -*lvalp : *lvalp;
1866 } else {
1867 int val = *valp;
1868 if (val < 0) {
1869 *negp = true;
1870 *lvalp = (unsigned long)-val;
1871 } else {
1872 *negp = false;
1873 *lvalp = (unsigned long)val;
1874 }
1875 }
1876 return 0;
1877 }
1878
1879 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1880
1881 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1882 int write, void __user *buffer,
1883 size_t *lenp, loff_t *ppos,
1884 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1885 int write, void *data),
1886 void *data)
1887 {
1888 int *i, vleft, first = 1, err = 0;
1889 unsigned long page = 0;
1890 size_t left;
1891 char *kbuf;
1892
1893 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1894 *lenp = 0;
1895 return 0;
1896 }
1897
1898 i = (int *) tbl_data;
1899 vleft = table->maxlen / sizeof(*i);
1900 left = *lenp;
1901
1902 if (!conv)
1903 conv = do_proc_dointvec_conv;
1904
1905 if (write) {
1906 if (left > PAGE_SIZE - 1)
1907 left = PAGE_SIZE - 1;
1908 page = __get_free_page(GFP_TEMPORARY);
1909 kbuf = (char *) page;
1910 if (!kbuf)
1911 return -ENOMEM;
1912 if (copy_from_user(kbuf, buffer, left)) {
1913 err = -EFAULT;
1914 goto free;
1915 }
1916 kbuf[left] = 0;
1917 }
1918
1919 for (; left && vleft--; i++, first=0) {
1920 unsigned long lval;
1921 bool neg;
1922
1923 if (write) {
1924 left -= proc_skip_spaces(&kbuf);
1925
1926 if (!left)
1927 break;
1928 err = proc_get_long(&kbuf, &left, &lval, &neg,
1929 proc_wspace_sep,
1930 sizeof(proc_wspace_sep), NULL);
1931 if (err)
1932 break;
1933 if (conv(&neg, &lval, i, 1, data)) {
1934 err = -EINVAL;
1935 break;
1936 }
1937 } else {
1938 if (conv(&neg, &lval, i, 0, data)) {
1939 err = -EINVAL;
1940 break;
1941 }
1942 if (!first)
1943 err = proc_put_char(&buffer, &left, '\t');
1944 if (err)
1945 break;
1946 err = proc_put_long(&buffer, &left, lval, neg);
1947 if (err)
1948 break;
1949 }
1950 }
1951
1952 if (!write && !first && left && !err)
1953 err = proc_put_char(&buffer, &left, '\n');
1954 if (write && !err && left)
1955 left -= proc_skip_spaces(&kbuf);
1956 free:
1957 if (write) {
1958 free_page(page);
1959 if (first)
1960 return err ? : -EINVAL;
1961 }
1962 *lenp -= left;
1963 *ppos += *lenp;
1964 return err;
1965 }
1966
1967 static int do_proc_dointvec(struct ctl_table *table, int write,
1968 void __user *buffer, size_t *lenp, loff_t *ppos,
1969 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1970 int write, void *data),
1971 void *data)
1972 {
1973 return __do_proc_dointvec(table->data, table, write,
1974 buffer, lenp, ppos, conv, data);
1975 }
1976
1977 /**
1978 * proc_dointvec - read a vector of integers
1979 * @table: the sysctl table
1980 * @write: %TRUE if this is a write to the sysctl file
1981 * @buffer: the user buffer
1982 * @lenp: the size of the user buffer
1983 * @ppos: file position
1984 *
1985 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1986 * values from/to the user buffer, treated as an ASCII string.
1987 *
1988 * Returns 0 on success.
1989 */
1990 int proc_dointvec(struct ctl_table *table, int write,
1991 void __user *buffer, size_t *lenp, loff_t *ppos)
1992 {
1993 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1994 NULL,NULL);
1995 }
1996
1997 /*
1998 * Taint values can only be increased
1999 * This means we can safely use a temporary.
2000 */
2001 static int proc_taint(struct ctl_table *table, int write,
2002 void __user *buffer, size_t *lenp, loff_t *ppos)
2003 {
2004 struct ctl_table t;
2005 unsigned long tmptaint = get_taint();
2006 int err;
2007
2008 if (write && !capable(CAP_SYS_ADMIN))
2009 return -EPERM;
2010
2011 t = *table;
2012 t.data = &tmptaint;
2013 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2014 if (err < 0)
2015 return err;
2016
2017 if (write) {
2018 /*
2019 * Poor man's atomic or. Not worth adding a primitive
2020 * to everyone's atomic.h for this
2021 */
2022 int i;
2023 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2024 if ((tmptaint >> i) & 1)
2025 add_taint(i, LOCKDEP_STILL_OK);
2026 }
2027 }
2028
2029 return err;
2030 }
2031
2032 #ifdef CONFIG_PRINTK
2033 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2034 void __user *buffer, size_t *lenp, loff_t *ppos)
2035 {
2036 if (write && !capable(CAP_SYS_ADMIN))
2037 return -EPERM;
2038
2039 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2040 }
2041 #endif
2042
2043 struct do_proc_dointvec_minmax_conv_param {
2044 int *min;
2045 int *max;
2046 };
2047
2048 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2049 int *valp,
2050 int write, void *data)
2051 {
2052 struct do_proc_dointvec_minmax_conv_param *param = data;
2053 if (write) {
2054 int val = *negp ? -*lvalp : *lvalp;
2055 if ((param->min && *param->min > val) ||
2056 (param->max && *param->max < val))
2057 return -EINVAL;
2058 *valp = val;
2059 } else {
2060 int val = *valp;
2061 if (val < 0) {
2062 *negp = true;
2063 *lvalp = (unsigned long)-val;
2064 } else {
2065 *negp = false;
2066 *lvalp = (unsigned long)val;
2067 }
2068 }
2069 return 0;
2070 }
2071
2072 /**
2073 * proc_dointvec_minmax - read a vector of integers with min/max values
2074 * @table: the sysctl table
2075 * @write: %TRUE if this is a write to the sysctl file
2076 * @buffer: the user buffer
2077 * @lenp: the size of the user buffer
2078 * @ppos: file position
2079 *
2080 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2081 * values from/to the user buffer, treated as an ASCII string.
2082 *
2083 * This routine will ensure the values are within the range specified by
2084 * table->extra1 (min) and table->extra2 (max).
2085 *
2086 * Returns 0 on success.
2087 */
2088 int proc_dointvec_minmax(struct ctl_table *table, int write,
2089 void __user *buffer, size_t *lenp, loff_t *ppos)
2090 {
2091 struct do_proc_dointvec_minmax_conv_param param = {
2092 .min = (int *) table->extra1,
2093 .max = (int *) table->extra2,
2094 };
2095 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2096 do_proc_dointvec_minmax_conv, &param);
2097 }
2098
2099 static void validate_coredump_safety(void)
2100 {
2101 #ifdef CONFIG_COREDUMP
2102 if (suid_dumpable == SUID_DUMP_ROOT &&
2103 core_pattern[0] != '/' && core_pattern[0] != '|') {
2104 printk(KERN_WARNING "Unsafe core_pattern used with "\
2105 "suid_dumpable=2. Pipe handler or fully qualified "\
2106 "core dump path required.\n");
2107 }
2108 #endif
2109 }
2110
2111 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2112 void __user *buffer, size_t *lenp, loff_t *ppos)
2113 {
2114 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2115 if (!error)
2116 validate_coredump_safety();
2117 return error;
2118 }
2119
2120 #ifdef CONFIG_COREDUMP
2121 static int proc_dostring_coredump(struct ctl_table *table, int write,
2122 void __user *buffer, size_t *lenp, loff_t *ppos)
2123 {
2124 int error = proc_dostring(table, write, buffer, lenp, ppos);
2125 if (!error)
2126 validate_coredump_safety();
2127 return error;
2128 }
2129 #endif
2130
2131 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2132 void __user *buffer,
2133 size_t *lenp, loff_t *ppos,
2134 unsigned long convmul,
2135 unsigned long convdiv)
2136 {
2137 unsigned long *i, *min, *max;
2138 int vleft, first = 1, err = 0;
2139 unsigned long page = 0;
2140 size_t left;
2141 char *kbuf;
2142
2143 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2144 *lenp = 0;
2145 return 0;
2146 }
2147
2148 i = (unsigned long *) data;
2149 min = (unsigned long *) table->extra1;
2150 max = (unsigned long *) table->extra2;
2151 vleft = table->maxlen / sizeof(unsigned long);
2152 left = *lenp;
2153
2154 if (write) {
2155 if (left > PAGE_SIZE - 1)
2156 left = PAGE_SIZE - 1;
2157 page = __get_free_page(GFP_TEMPORARY);
2158 kbuf = (char *) page;
2159 if (!kbuf)
2160 return -ENOMEM;
2161 if (copy_from_user(kbuf, buffer, left)) {
2162 err = -EFAULT;
2163 goto free;
2164 }
2165 kbuf[left] = 0;
2166 }
2167
2168 for (; left && vleft--; i++, first = 0) {
2169 unsigned long val;
2170
2171 if (write) {
2172 bool neg;
2173
2174 left -= proc_skip_spaces(&kbuf);
2175
2176 err = proc_get_long(&kbuf, &left, &val, &neg,
2177 proc_wspace_sep,
2178 sizeof(proc_wspace_sep), NULL);
2179 if (err)
2180 break;
2181 if (neg)
2182 continue;
2183 if ((min && val < *min) || (max && val > *max))
2184 continue;
2185 *i = val;
2186 } else {
2187 val = convdiv * (*i) / convmul;
2188 if (!first)
2189 err = proc_put_char(&buffer, &left, '\t');
2190 err = proc_put_long(&buffer, &left, val, false);
2191 if (err)
2192 break;
2193 }
2194 }
2195
2196 if (!write && !first && left && !err)
2197 err = proc_put_char(&buffer, &left, '\n');
2198 if (write && !err)
2199 left -= proc_skip_spaces(&kbuf);
2200 free:
2201 if (write) {
2202 free_page(page);
2203 if (first)
2204 return err ? : -EINVAL;
2205 }
2206 *lenp -= left;
2207 *ppos += *lenp;
2208 return err;
2209 }
2210
2211 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2212 void __user *buffer,
2213 size_t *lenp, loff_t *ppos,
2214 unsigned long convmul,
2215 unsigned long convdiv)
2216 {
2217 return __do_proc_doulongvec_minmax(table->data, table, write,
2218 buffer, lenp, ppos, convmul, convdiv);
2219 }
2220
2221 /**
2222 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2223 * @table: the sysctl table
2224 * @write: %TRUE if this is a write to the sysctl file
2225 * @buffer: the user buffer
2226 * @lenp: the size of the user buffer
2227 * @ppos: file position
2228 *
2229 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2230 * values from/to the user buffer, treated as an ASCII string.
2231 *
2232 * This routine will ensure the values are within the range specified by
2233 * table->extra1 (min) and table->extra2 (max).
2234 *
2235 * Returns 0 on success.
2236 */
2237 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2238 void __user *buffer, size_t *lenp, loff_t *ppos)
2239 {
2240 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2241 }
2242
2243 /**
2244 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2245 * @table: the sysctl table
2246 * @write: %TRUE if this is a write to the sysctl file
2247 * @buffer: the user buffer
2248 * @lenp: the size of the user buffer
2249 * @ppos: file position
2250 *
2251 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2252 * values from/to the user buffer, treated as an ASCII string. The values
2253 * are treated as milliseconds, and converted to jiffies when they are stored.
2254 *
2255 * This routine will ensure the values are within the range specified by
2256 * table->extra1 (min) and table->extra2 (max).
2257 *
2258 * Returns 0 on success.
2259 */
2260 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2261 void __user *buffer,
2262 size_t *lenp, loff_t *ppos)
2263 {
2264 return do_proc_doulongvec_minmax(table, write, buffer,
2265 lenp, ppos, HZ, 1000l);
2266 }
2267
2268
2269 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2270 int *valp,
2271 int write, void *data)
2272 {
2273 if (write) {
2274 if (*lvalp > LONG_MAX / HZ)
2275 return 1;
2276 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2277 } else {
2278 int val = *valp;
2279 unsigned long lval;
2280 if (val < 0) {
2281 *negp = true;
2282 lval = (unsigned long)-val;
2283 } else {
2284 *negp = false;
2285 lval = (unsigned long)val;
2286 }
2287 *lvalp = lval / HZ;
2288 }
2289 return 0;
2290 }
2291
2292 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2293 int *valp,
2294 int write, void *data)
2295 {
2296 if (write) {
2297 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2298 return 1;
2299 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2300 } else {
2301 int val = *valp;
2302 unsigned long lval;
2303 if (val < 0) {
2304 *negp = true;
2305 lval = (unsigned long)-val;
2306 } else {
2307 *negp = false;
2308 lval = (unsigned long)val;
2309 }
2310 *lvalp = jiffies_to_clock_t(lval);
2311 }
2312 return 0;
2313 }
2314
2315 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2316 int *valp,
2317 int write, void *data)
2318 {
2319 if (write) {
2320 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2321 } else {
2322 int val = *valp;
2323 unsigned long lval;
2324 if (val < 0) {
2325 *negp = true;
2326 lval = (unsigned long)-val;
2327 } else {
2328 *negp = false;
2329 lval = (unsigned long)val;
2330 }
2331 *lvalp = jiffies_to_msecs(lval);
2332 }
2333 return 0;
2334 }
2335
2336 /**
2337 * proc_dointvec_jiffies - read a vector of integers as seconds
2338 * @table: the sysctl table
2339 * @write: %TRUE if this is a write to the sysctl file
2340 * @buffer: the user buffer
2341 * @lenp: the size of the user buffer
2342 * @ppos: file position
2343 *
2344 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2345 * values from/to the user buffer, treated as an ASCII string.
2346 * The values read are assumed to be in seconds, and are converted into
2347 * jiffies.
2348 *
2349 * Returns 0 on success.
2350 */
2351 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2352 void __user *buffer, size_t *lenp, loff_t *ppos)
2353 {
2354 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2355 do_proc_dointvec_jiffies_conv,NULL);
2356 }
2357
2358 /**
2359 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2360 * @table: the sysctl table
2361 * @write: %TRUE if this is a write to the sysctl file
2362 * @buffer: the user buffer
2363 * @lenp: the size of the user buffer
2364 * @ppos: pointer to the file position
2365 *
2366 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2367 * values from/to the user buffer, treated as an ASCII string.
2368 * The values read are assumed to be in 1/USER_HZ seconds, and
2369 * are converted into jiffies.
2370 *
2371 * Returns 0 on success.
2372 */
2373 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2374 void __user *buffer, size_t *lenp, loff_t *ppos)
2375 {
2376 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2377 do_proc_dointvec_userhz_jiffies_conv,NULL);
2378 }
2379
2380 /**
2381 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2382 * @table: the sysctl table
2383 * @write: %TRUE if this is a write to the sysctl file
2384 * @buffer: the user buffer
2385 * @lenp: the size of the user buffer
2386 * @ppos: file position
2387 * @ppos: the current position in the file
2388 *
2389 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2390 * values from/to the user buffer, treated as an ASCII string.
2391 * The values read are assumed to be in 1/1000 seconds, and
2392 * are converted into jiffies.
2393 *
2394 * Returns 0 on success.
2395 */
2396 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2397 void __user *buffer, size_t *lenp, loff_t *ppos)
2398 {
2399 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2400 do_proc_dointvec_ms_jiffies_conv, NULL);
2401 }
2402
2403 static int proc_do_cad_pid(struct ctl_table *table, int write,
2404 void __user *buffer, size_t *lenp, loff_t *ppos)
2405 {
2406 struct pid *new_pid;
2407 pid_t tmp;
2408 int r;
2409
2410 tmp = pid_vnr(cad_pid);
2411
2412 r = __do_proc_dointvec(&tmp, table, write, buffer,
2413 lenp, ppos, NULL, NULL);
2414 if (r || !write)
2415 return r;
2416
2417 new_pid = find_get_pid(tmp);
2418 if (!new_pid)
2419 return -ESRCH;
2420
2421 put_pid(xchg(&cad_pid, new_pid));
2422 return 0;
2423 }
2424
2425 /**
2426 * proc_do_large_bitmap - read/write from/to a large bitmap
2427 * @table: the sysctl table
2428 * @write: %TRUE if this is a write to the sysctl file
2429 * @buffer: the user buffer
2430 * @lenp: the size of the user buffer
2431 * @ppos: file position
2432 *
2433 * The bitmap is stored at table->data and the bitmap length (in bits)
2434 * in table->maxlen.
2435 *
2436 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2437 * large bitmaps may be represented in a compact manner. Writing into
2438 * the file will clear the bitmap then update it with the given input.
2439 *
2440 * Returns 0 on success.
2441 */
2442 int proc_do_large_bitmap(struct ctl_table *table, int write,
2443 void __user *buffer, size_t *lenp, loff_t *ppos)
2444 {
2445 int err = 0;
2446 bool first = 1;
2447 size_t left = *lenp;
2448 unsigned long bitmap_len = table->maxlen;
2449 unsigned long *bitmap = (unsigned long *) table->data;
2450 unsigned long *tmp_bitmap = NULL;
2451 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2452
2453 if (!bitmap_len || !left || (*ppos && !write)) {
2454 *lenp = 0;
2455 return 0;
2456 }
2457
2458 if (write) {
2459 unsigned long page = 0;
2460 char *kbuf;
2461
2462 if (left > PAGE_SIZE - 1)
2463 left = PAGE_SIZE - 1;
2464
2465 page = __get_free_page(GFP_TEMPORARY);
2466 kbuf = (char *) page;
2467 if (!kbuf)
2468 return -ENOMEM;
2469 if (copy_from_user(kbuf, buffer, left)) {
2470 free_page(page);
2471 return -EFAULT;
2472 }
2473 kbuf[left] = 0;
2474
2475 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2476 GFP_KERNEL);
2477 if (!tmp_bitmap) {
2478 free_page(page);
2479 return -ENOMEM;
2480 }
2481 proc_skip_char(&kbuf, &left, '\n');
2482 while (!err && left) {
2483 unsigned long val_a, val_b;
2484 bool neg;
2485
2486 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2487 sizeof(tr_a), &c);
2488 if (err)
2489 break;
2490 if (val_a >= bitmap_len || neg) {
2491 err = -EINVAL;
2492 break;
2493 }
2494
2495 val_b = val_a;
2496 if (left) {
2497 kbuf++;
2498 left--;
2499 }
2500
2501 if (c == '-') {
2502 err = proc_get_long(&kbuf, &left, &val_b,
2503 &neg, tr_b, sizeof(tr_b),
2504 &c);
2505 if (err)
2506 break;
2507 if (val_b >= bitmap_len || neg ||
2508 val_a > val_b) {
2509 err = -EINVAL;
2510 break;
2511 }
2512 if (left) {
2513 kbuf++;
2514 left--;
2515 }
2516 }
2517
2518 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2519 first = 0;
2520 proc_skip_char(&kbuf, &left, '\n');
2521 }
2522 free_page(page);
2523 } else {
2524 unsigned long bit_a, bit_b = 0;
2525
2526 while (left) {
2527 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2528 if (bit_a >= bitmap_len)
2529 break;
2530 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2531 bit_a + 1) - 1;
2532
2533 if (!first) {
2534 err = proc_put_char(&buffer, &left, ',');
2535 if (err)
2536 break;
2537 }
2538 err = proc_put_long(&buffer, &left, bit_a, false);
2539 if (err)
2540 break;
2541 if (bit_a != bit_b) {
2542 err = proc_put_char(&buffer, &left, '-');
2543 if (err)
2544 break;
2545 err = proc_put_long(&buffer, &left, bit_b, false);
2546 if (err)
2547 break;
2548 }
2549
2550 first = 0; bit_b++;
2551 }
2552 if (!err)
2553 err = proc_put_char(&buffer, &left, '\n');
2554 }
2555
2556 if (!err) {
2557 if (write) {
2558 if (*ppos)
2559 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2560 else
2561 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2562 }
2563 kfree(tmp_bitmap);
2564 *lenp -= left;
2565 *ppos += *lenp;
2566 return 0;
2567 } else {
2568 kfree(tmp_bitmap);
2569 return err;
2570 }
2571 }
2572
2573 #else /* CONFIG_PROC_SYSCTL */
2574
2575 int proc_dostring(struct ctl_table *table, int write,
2576 void __user *buffer, size_t *lenp, loff_t *ppos)
2577 {
2578 return -ENOSYS;
2579 }
2580
2581 int proc_dointvec(struct ctl_table *table, int write,
2582 void __user *buffer, size_t *lenp, loff_t *ppos)
2583 {
2584 return -ENOSYS;
2585 }
2586
2587 int proc_dointvec_minmax(struct ctl_table *table, int write,
2588 void __user *buffer, size_t *lenp, loff_t *ppos)
2589 {
2590 return -ENOSYS;
2591 }
2592
2593 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2594 void __user *buffer, size_t *lenp, loff_t *ppos)
2595 {
2596 return -ENOSYS;
2597 }
2598
2599 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2600 void __user *buffer, size_t *lenp, loff_t *ppos)
2601 {
2602 return -ENOSYS;
2603 }
2604
2605 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2606 void __user *buffer, size_t *lenp, loff_t *ppos)
2607 {
2608 return -ENOSYS;
2609 }
2610
2611 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2612 void __user *buffer, size_t *lenp, loff_t *ppos)
2613 {
2614 return -ENOSYS;
2615 }
2616
2617 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2618 void __user *buffer,
2619 size_t *lenp, loff_t *ppos)
2620 {
2621 return -ENOSYS;
2622 }
2623
2624
2625 #endif /* CONFIG_PROC_SYSCTL */
2626
2627 /*
2628 * No sense putting this after each symbol definition, twice,
2629 * exception granted :-)
2630 */
2631 EXPORT_SYMBOL(proc_dointvec);
2632 EXPORT_SYMBOL(proc_dointvec_jiffies);
2633 EXPORT_SYMBOL(proc_dointvec_minmax);
2634 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2635 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2636 EXPORT_SYMBOL(proc_dostring);
2637 EXPORT_SYMBOL(proc_doulongvec_minmax);
2638 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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