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