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percpu: pcpu_embed_first_chunk() should free unused parts after all allocs are complete
[linux-2.6.git] / kernel / sysctl.c
blob4ab11879aeb4d15baa3d8d25fa753725084ed809
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/fs.h>
34 #include <linux/init.h>
35 #include <linux/kernel.h>
36 #include <linux/kobject.h>
37 #include <linux/net.h>
38 #include <linux/sysrq.h>
39 #include <linux/highuid.h>
40 #include <linux/writeback.h>
41 #include <linux/ratelimit.h>
42 #include <linux/compaction.h>
43 #include <linux/hugetlb.h>
44 #include <linux/initrd.h>
45 #include <linux/key.h>
46 #include <linux/times.h>
47 #include <linux/limits.h>
48 #include <linux/dcache.h>
49 #include <linux/dnotify.h>
50 #include <linux/syscalls.h>
51 #include <linux/vmstat.h>
52 #include <linux/nfs_fs.h>
53 #include <linux/acpi.h>
54 #include <linux/reboot.h>
55 #include <linux/ftrace.h>
56 #include <linux/perf_event.h>
57 #include <linux/kprobes.h>
58 #include <linux/pipe_fs_i.h>
59 #include <linux/oom.h>
60 #include <linux/kmod.h>
61 #include <linux/capability.h>
62 #include <linux/binfmts.h>
63
64 #include <asm/uaccess.h>
65 #include <asm/processor.h>
66
67 #ifdef CONFIG_X86
68 #include <asm/nmi.h>
69 #include <asm/stacktrace.h>
70 #include <asm/io.h>
71 #endif
72 #ifdef CONFIG_SPARC
73 #include <asm/setup.h>
74 #endif
75 #ifdef CONFIG_BSD_PROCESS_ACCT
76 #include <linux/acct.h>
77 #endif
78 #ifdef CONFIG_RT_MUTEXES
79 #include <linux/rtmutex.h>
80 #endif
81 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
82 #include <linux/lockdep.h>
83 #endif
84 #ifdef CONFIG_CHR_DEV_SG
85 #include <scsi/sg.h>
86 #endif
87
88 #ifdef CONFIG_LOCKUP_DETECTOR
89 #include <linux/nmi.h>
90 #endif
91
92
93 #if defined(CONFIG_SYSCTL)
94
95 /* External variables not in a header file. */
96 extern int sysctl_overcommit_memory;
97 extern int sysctl_overcommit_ratio;
98 extern int max_threads;
99 extern int core_uses_pid;
100 extern int suid_dumpable;
101 extern char core_pattern[];
102 extern unsigned int core_pipe_limit;
103 extern int pid_max;
104 extern int min_free_kbytes;
105 extern int pid_max_min, pid_max_max;
106 extern int sysctl_drop_caches;
107 extern int percpu_pagelist_fraction;
108 extern int compat_log;
109 extern int latencytop_enabled;
110 extern int sysctl_nr_open_min, sysctl_nr_open_max;
111 #ifndef CONFIG_MMU
112 extern int sysctl_nr_trim_pages;
113 #endif
114 #ifdef CONFIG_BLOCK
115 extern int blk_iopoll_enabled;
116 #endif
117
118 /* Constants used for minimum and maximum */
119 #ifdef CONFIG_LOCKUP_DETECTOR
120 static int sixty = 60;
121 static int neg_one = -1;
122 #endif
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused three = 3;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 #ifdef CONFIG_PRINTK
131 static int ten_thousand = 10000;
132 #endif
133
134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136
137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138 static int maxolduid = 65535;
139 static int minolduid;
140 static int min_percpu_pagelist_fract = 8;
141
142 static int ngroups_max = NGROUPS_MAX;
143 static const int cap_last_cap = CAP_LAST_CAP;
144
145 #ifdef CONFIG_INOTIFY_USER
146 #include <linux/inotify.h>
147 #endif
148 #ifdef CONFIG_SPARC
149 #endif
150
151 #ifdef CONFIG_SPARC64
152 extern int sysctl_tsb_ratio;
153 #endif
154
155 #ifdef __hppa__
156 extern int pwrsw_enabled;
157 extern int unaligned_enabled;
158 #endif
159
160 #ifdef CONFIG_IA64
161 extern int no_unaligned_warning;
162 extern int unaligned_dump_stack;
163 #endif
164
165 #ifdef CONFIG_PROC_SYSCTL
166 static int proc_do_cad_pid(struct ctl_table *table, int write,
167 void __user *buffer, size_t *lenp, loff_t *ppos);
168 static int proc_taint(struct ctl_table *table, int write,
169 void __user *buffer, size_t *lenp, loff_t *ppos);
170 #endif
171
172 #ifdef CONFIG_PRINTK
173 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175 #endif
176
177 #ifdef CONFIG_MAGIC_SYSRQ
178 /* Note: sysrq code uses it's own private copy */
179 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
180
181 static int sysrq_sysctl_handler(ctl_table *table, int write,
182 void __user *buffer, size_t *lenp,
183 loff_t *ppos)
184 {
185 int error;
186
187 error = proc_dointvec(table, write, buffer, lenp, ppos);
188 if (error)
189 return error;
190
191 if (write)
192 sysrq_toggle_support(__sysrq_enabled);
193
194 return 0;
195 }
196
197 #endif
198
199 static struct ctl_table kern_table[];
200 static struct ctl_table vm_table[];
201 static struct ctl_table fs_table[];
202 static struct ctl_table debug_table[];
203 static struct ctl_table dev_table[];
204 extern struct ctl_table random_table[];
205 #ifdef CONFIG_EPOLL
206 extern struct ctl_table epoll_table[];
207 #endif
208
209 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
210 int sysctl_legacy_va_layout;
211 #endif
212
213 /* The default sysctl tables: */
214
215 static struct ctl_table sysctl_base_table[] = {
216 {
217 .procname = "kernel",
218 .mode = 0555,
219 .child = kern_table,
220 },
221 {
222 .procname = "vm",
223 .mode = 0555,
224 .child = vm_table,
225 },
226 {
227 .procname = "fs",
228 .mode = 0555,
229 .child = fs_table,
230 },
231 {
232 .procname = "debug",
233 .mode = 0555,
234 .child = debug_table,
235 },
236 {
237 .procname = "dev",
238 .mode = 0555,
239 .child = dev_table,
240 },
241 { }
242 };
243
244 #ifdef CONFIG_SCHED_DEBUG
245 static int min_sched_granularity_ns = 100000; /* 100 usecs */
246 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
247 static int min_wakeup_granularity_ns; /* 0 usecs */
248 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
249 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
250 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
251 #endif
252
253 #ifdef CONFIG_COMPACTION
254 static int min_extfrag_threshold;
255 static int max_extfrag_threshold = 1000;
256 #endif
257
258 static struct ctl_table kern_table[] = {
259 {
260 .procname = "sched_child_runs_first",
261 .data = &sysctl_sched_child_runs_first,
262 .maxlen = sizeof(unsigned int),
263 .mode = 0644,
264 .proc_handler = proc_dointvec,
265 },
266 #ifdef CONFIG_SCHED_DEBUG
267 {
268 .procname = "sched_min_granularity_ns",
269 .data = &sysctl_sched_min_granularity,
270 .maxlen = sizeof(unsigned int),
271 .mode = 0644,
272 .proc_handler = sched_proc_update_handler,
273 .extra1 = &min_sched_granularity_ns,
274 .extra2 = &max_sched_granularity_ns,
275 },
276 {
277 .procname = "sched_latency_ns",
278 .data = &sysctl_sched_latency,
279 .maxlen = sizeof(unsigned int),
280 .mode = 0644,
281 .proc_handler = sched_proc_update_handler,
282 .extra1 = &min_sched_granularity_ns,
283 .extra2 = &max_sched_granularity_ns,
284 },
285 {
286 .procname = "sched_wakeup_granularity_ns",
287 .data = &sysctl_sched_wakeup_granularity,
288 .maxlen = sizeof(unsigned int),
289 .mode = 0644,
290 .proc_handler = sched_proc_update_handler,
291 .extra1 = &min_wakeup_granularity_ns,
292 .extra2 = &max_wakeup_granularity_ns,
293 },
294 {
295 .procname = "sched_tunable_scaling",
296 .data = &sysctl_sched_tunable_scaling,
297 .maxlen = sizeof(enum sched_tunable_scaling),
298 .mode = 0644,
299 .proc_handler = sched_proc_update_handler,
300 .extra1 = &min_sched_tunable_scaling,
301 .extra2 = &max_sched_tunable_scaling,
302 },
303 {
304 .procname = "sched_migration_cost",
305 .data = &sysctl_sched_migration_cost,
306 .maxlen = sizeof(unsigned int),
307 .mode = 0644,
308 .proc_handler = proc_dointvec,
309 },
310 {
311 .procname = "sched_nr_migrate",
312 .data = &sysctl_sched_nr_migrate,
313 .maxlen = sizeof(unsigned int),
314 .mode = 0644,
315 .proc_handler = proc_dointvec,
316 },
317 {
318 .procname = "sched_time_avg",
319 .data = &sysctl_sched_time_avg,
320 .maxlen = sizeof(unsigned int),
321 .mode = 0644,
322 .proc_handler = proc_dointvec,
323 },
324 {
325 .procname = "sched_shares_window",
326 .data = &sysctl_sched_shares_window,
327 .maxlen = sizeof(unsigned int),
328 .mode = 0644,
329 .proc_handler = proc_dointvec,
330 },
331 {
332 .procname = "timer_migration",
333 .data = &sysctl_timer_migration,
334 .maxlen = sizeof(unsigned int),
335 .mode = 0644,
336 .proc_handler = proc_dointvec_minmax,
337 .extra1 = &zero,
338 .extra2 = &one,
339 },
340 #endif
341 {
342 .procname = "sched_rt_period_us",
343 .data = &sysctl_sched_rt_period,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = sched_rt_handler,
347 },
348 {
349 .procname = "sched_rt_runtime_us",
350 .data = &sysctl_sched_rt_runtime,
351 .maxlen = sizeof(int),
352 .mode = 0644,
353 .proc_handler = sched_rt_handler,
354 },
355 #ifdef CONFIG_SCHED_AUTOGROUP
356 {
357 .procname = "sched_autogroup_enabled",
358 .data = &sysctl_sched_autogroup_enabled,
359 .maxlen = sizeof(unsigned int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec_minmax,
362 .extra1 = &zero,
363 .extra2 = &one,
364 },
365 #endif
366 #ifdef CONFIG_CFS_BANDWIDTH
367 {
368 .procname = "sched_cfs_bandwidth_slice_us",
369 .data = &sysctl_sched_cfs_bandwidth_slice,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec_minmax,
373 .extra1 = &one,
374 },
375 #endif
376 #ifdef CONFIG_PROVE_LOCKING
377 {
378 .procname = "prove_locking",
379 .data = &prove_locking,
380 .maxlen = sizeof(int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384 #endif
385 #ifdef CONFIG_LOCK_STAT
386 {
387 .procname = "lock_stat",
388 .data = &lock_stat,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393 #endif
394 {
395 .procname = "panic",
396 .data = &panic_timeout,
397 .maxlen = sizeof(int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec,
400 },
401 {
402 .procname = "core_uses_pid",
403 .data = &core_uses_pid,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec,
407 },
408 {
409 .procname = "core_pattern",
410 .data = core_pattern,
411 .maxlen = CORENAME_MAX_SIZE,
412 .mode = 0644,
413 .proc_handler = proc_dostring,
414 },
415 {
416 .procname = "core_pipe_limit",
417 .data = &core_pipe_limit,
418 .maxlen = sizeof(unsigned int),
419 .mode = 0644,
420 .proc_handler = proc_dointvec,
421 },
422 #ifdef CONFIG_PROC_SYSCTL
423 {
424 .procname = "tainted",
425 .maxlen = sizeof(long),
426 .mode = 0644,
427 .proc_handler = proc_taint,
428 },
429 #endif
430 #ifdef CONFIG_LATENCYTOP
431 {
432 .procname = "latencytop",
433 .data = &latencytop_enabled,
434 .maxlen = sizeof(int),
435 .mode = 0644,
436 .proc_handler = proc_dointvec,
437 },
438 #endif
439 #ifdef CONFIG_BLK_DEV_INITRD
440 {
441 .procname = "real-root-dev",
442 .data = &real_root_dev,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec,
446 },
447 #endif
448 {
449 .procname = "print-fatal-signals",
450 .data = &print_fatal_signals,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec,
454 },
455 #ifdef CONFIG_SPARC
456 {
457 .procname = "reboot-cmd",
458 .data = reboot_command,
459 .maxlen = 256,
460 .mode = 0644,
461 .proc_handler = proc_dostring,
462 },
463 {
464 .procname = "stop-a",
465 .data = &stop_a_enabled,
466 .maxlen = sizeof (int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec,
469 },
470 {
471 .procname = "scons-poweroff",
472 .data = &scons_pwroff,
473 .maxlen = sizeof (int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec,
476 },
477 #endif
478 #ifdef CONFIG_SPARC64
479 {
480 .procname = "tsb-ratio",
481 .data = &sysctl_tsb_ratio,
482 .maxlen = sizeof (int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 #endif
487 #ifdef __hppa__
488 {
489 .procname = "soft-power",
490 .data = &pwrsw_enabled,
491 .maxlen = sizeof (int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec,
494 },
495 {
496 .procname = "unaligned-trap",
497 .data = &unaligned_enabled,
498 .maxlen = sizeof (int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec,
501 },
502 #endif
503 {
504 .procname = "ctrl-alt-del",
505 .data = &C_A_D,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec,
509 },
510 #ifdef CONFIG_FUNCTION_TRACER
511 {
512 .procname = "ftrace_enabled",
513 .data = &ftrace_enabled,
514 .maxlen = sizeof(int),
515 .mode = 0644,
516 .proc_handler = ftrace_enable_sysctl,
517 },
518 #endif
519 #ifdef CONFIG_STACK_TRACER
520 {
521 .procname = "stack_tracer_enabled",
522 .data = &stack_tracer_enabled,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = stack_trace_sysctl,
526 },
527 #endif
528 #ifdef CONFIG_TRACING
529 {
530 .procname = "ftrace_dump_on_oops",
531 .data = &ftrace_dump_on_oops,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = proc_dointvec,
535 },
536 #endif
537 #ifdef CONFIG_MODULES
538 {
539 .procname = "modprobe",
540 .data = &modprobe_path,
541 .maxlen = KMOD_PATH_LEN,
542 .mode = 0644,
543 .proc_handler = proc_dostring,
544 },
545 {
546 .procname = "modules_disabled",
547 .data = &modules_disabled,
548 .maxlen = sizeof(int),
549 .mode = 0644,
550 /* only handle a transition from default "0" to "1" */
551 .proc_handler = proc_dointvec_minmax,
552 .extra1 = &one,
553 .extra2 = &one,
554 },
555 #endif
556 #ifdef CONFIG_HOTPLUG
557 {
558 .procname = "hotplug",
559 .data = &uevent_helper,
560 .maxlen = UEVENT_HELPER_PATH_LEN,
561 .mode = 0644,
562 .proc_handler = proc_dostring,
563 },
564 #endif
565 #ifdef CONFIG_CHR_DEV_SG
566 {
567 .procname = "sg-big-buff",
568 .data = &sg_big_buff,
569 .maxlen = sizeof (int),
570 .mode = 0444,
571 .proc_handler = proc_dointvec,
572 },
573 #endif
574 #ifdef CONFIG_BSD_PROCESS_ACCT
575 {
576 .procname = "acct",
577 .data = &acct_parm,
578 .maxlen = 3*sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582 #endif
583 #ifdef CONFIG_MAGIC_SYSRQ
584 {
585 .procname = "sysrq",
586 .data = &__sysrq_enabled,
587 .maxlen = sizeof (int),
588 .mode = 0644,
589 .proc_handler = sysrq_sysctl_handler,
590 },
591 #endif
592 #ifdef CONFIG_PROC_SYSCTL
593 {
594 .procname = "cad_pid",
595 .data = NULL,
596 .maxlen = sizeof (int),
597 .mode = 0600,
598 .proc_handler = proc_do_cad_pid,
599 },
600 #endif
601 {
602 .procname = "threads-max",
603 .data = &max_threads,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec,
607 },
608 {
609 .procname = "random",
610 .mode = 0555,
611 .child = random_table,
612 },
613 {
614 .procname = "usermodehelper",
615 .mode = 0555,
616 .child = usermodehelper_table,
617 },
618 {
619 .procname = "overflowuid",
620 .data = &overflowuid,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 .proc_handler = proc_dointvec_minmax,
624 .extra1 = &minolduid,
625 .extra2 = &maxolduid,
626 },
627 {
628 .procname = "overflowgid",
629 .data = &overflowgid,
630 .maxlen = sizeof(int),
631 .mode = 0644,
632 .proc_handler = proc_dointvec_minmax,
633 .extra1 = &minolduid,
634 .extra2 = &maxolduid,
635 },
636 #ifdef CONFIG_S390
637 #ifdef CONFIG_MATHEMU
638 {
639 .procname = "ieee_emulation_warnings",
640 .data = &sysctl_ieee_emulation_warnings,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 .proc_handler = proc_dointvec,
644 },
645 #endif
646 {
647 .procname = "userprocess_debug",
648 .data = &show_unhandled_signals,
649 .maxlen = sizeof(int),
650 .mode = 0644,
651 .proc_handler = proc_dointvec,
652 },
653 #endif
654 {
655 .procname = "pid_max",
656 .data = &pid_max,
657 .maxlen = sizeof (int),
658 .mode = 0644,
659 .proc_handler = proc_dointvec_minmax,
660 .extra1 = &pid_max_min,
661 .extra2 = &pid_max_max,
662 },
663 {
664 .procname = "panic_on_oops",
665 .data = &panic_on_oops,
666 .maxlen = sizeof(int),
667 .mode = 0644,
668 .proc_handler = proc_dointvec,
669 },
670 #if defined CONFIG_PRINTK
671 {
672 .procname = "printk",
673 .data = &console_loglevel,
674 .maxlen = 4*sizeof(int),
675 .mode = 0644,
676 .proc_handler = proc_dointvec,
677 },
678 {
679 .procname = "printk_ratelimit",
680 .data = &printk_ratelimit_state.interval,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = proc_dointvec_jiffies,
684 },
685 {
686 .procname = "printk_ratelimit_burst",
687 .data = &printk_ratelimit_state.burst,
688 .maxlen = sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec,
691 },
692 {
693 .procname = "printk_delay",
694 .data = &printk_delay_msec,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = &zero,
699 .extra2 = &ten_thousand,
700 },
701 {
702 .procname = "dmesg_restrict",
703 .data = &dmesg_restrict,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 .proc_handler = proc_dointvec_minmax_sysadmin,
707 .extra1 = &zero,
708 .extra2 = &one,
709 },
710 {
711 .procname = "kptr_restrict",
712 .data = &kptr_restrict,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec_minmax_sysadmin,
716 .extra1 = &zero,
717 .extra2 = &two,
718 },
719 #endif
720 {
721 .procname = "ngroups_max",
722 .data = &ngroups_max,
723 .maxlen = sizeof (int),
724 .mode = 0444,
725 .proc_handler = proc_dointvec,
726 },
727 {
728 .procname = "cap_last_cap",
729 .data = (void *)&cap_last_cap,
730 .maxlen = sizeof(int),
731 .mode = 0444,
732 .proc_handler = proc_dointvec,
733 },
734 #if defined(CONFIG_LOCKUP_DETECTOR)
735 {
736 .procname = "watchdog",
737 .data = &watchdog_enabled,
738 .maxlen = sizeof (int),
739 .mode = 0644,
740 .proc_handler = proc_dowatchdog,
741 .extra1 = &zero,
742 .extra2 = &one,
743 },
744 {
745 .procname = "watchdog_thresh",
746 .data = &watchdog_thresh,
747 .maxlen = sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dowatchdog,
750 .extra1 = &neg_one,
751 .extra2 = &sixty,
752 },
753 {
754 .procname = "softlockup_panic",
755 .data = &softlockup_panic,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec_minmax,
759 .extra1 = &zero,
760 .extra2 = &one,
761 },
762 {
763 .procname = "nmi_watchdog",
764 .data = &watchdog_enabled,
765 .maxlen = sizeof (int),
766 .mode = 0644,
767 .proc_handler = proc_dowatchdog,
768 .extra1 = &zero,
769 .extra2 = &one,
770 },
771 #endif
772 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
773 {
774 .procname = "unknown_nmi_panic",
775 .data = &unknown_nmi_panic,
776 .maxlen = sizeof (int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec,
779 },
780 #endif
781 #if defined(CONFIG_X86)
782 {
783 .procname = "panic_on_unrecovered_nmi",
784 .data = &panic_on_unrecovered_nmi,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec,
788 },
789 {
790 .procname = "panic_on_io_nmi",
791 .data = &panic_on_io_nmi,
792 .maxlen = sizeof(int),
793 .mode = 0644,
794 .proc_handler = proc_dointvec,
795 },
796 #ifdef CONFIG_DEBUG_STACKOVERFLOW
797 {
798 .procname = "panic_on_stackoverflow",
799 .data = &sysctl_panic_on_stackoverflow,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec,
803 },
804 #endif
805 {
806 .procname = "bootloader_type",
807 .data = &bootloader_type,
808 .maxlen = sizeof (int),
809 .mode = 0444,
810 .proc_handler = proc_dointvec,
811 },
812 {
813 .procname = "bootloader_version",
814 .data = &bootloader_version,
815 .maxlen = sizeof (int),
816 .mode = 0444,
817 .proc_handler = proc_dointvec,
818 },
819 {
820 .procname = "kstack_depth_to_print",
821 .data = &kstack_depth_to_print,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec,
825 },
826 {
827 .procname = "io_delay_type",
828 .data = &io_delay_type,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec,
832 },
833 #endif
834 #if defined(CONFIG_MMU)
835 {
836 .procname = "randomize_va_space",
837 .data = &randomize_va_space,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec,
841 },
842 #endif
843 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
844 {
845 .procname = "spin_retry",
846 .data = &spin_retry,
847 .maxlen = sizeof (int),
848 .mode = 0644,
849 .proc_handler = proc_dointvec,
850 },
851 #endif
852 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
853 {
854 .procname = "acpi_video_flags",
855 .data = &acpi_realmode_flags,
856 .maxlen = sizeof (unsigned long),
857 .mode = 0644,
858 .proc_handler = proc_doulongvec_minmax,
859 },
860 #endif
861 #ifdef CONFIG_IA64
862 {
863 .procname = "ignore-unaligned-usertrap",
864 .data = &no_unaligned_warning,
865 .maxlen = sizeof (int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec,
868 },
869 {
870 .procname = "unaligned-dump-stack",
871 .data = &unaligned_dump_stack,
872 .maxlen = sizeof (int),
873 .mode = 0644,
874 .proc_handler = proc_dointvec,
875 },
876 #endif
877 #ifdef CONFIG_DETECT_HUNG_TASK
878 {
879 .procname = "hung_task_panic",
880 .data = &sysctl_hung_task_panic,
881 .maxlen = sizeof(int),
882 .mode = 0644,
883 .proc_handler = proc_dointvec_minmax,
884 .extra1 = &zero,
885 .extra2 = &one,
886 },
887 {
888 .procname = "hung_task_check_count",
889 .data = &sysctl_hung_task_check_count,
890 .maxlen = sizeof(unsigned long),
891 .mode = 0644,
892 .proc_handler = proc_doulongvec_minmax,
893 },
894 {
895 .procname = "hung_task_timeout_secs",
896 .data = &sysctl_hung_task_timeout_secs,
897 .maxlen = sizeof(unsigned long),
898 .mode = 0644,
899 .proc_handler = proc_dohung_task_timeout_secs,
900 },
901 {
902 .procname = "hung_task_warnings",
903 .data = &sysctl_hung_task_warnings,
904 .maxlen = sizeof(unsigned long),
905 .mode = 0644,
906 .proc_handler = proc_doulongvec_minmax,
907 },
908 #endif
909 #ifdef CONFIG_COMPAT
910 {
911 .procname = "compat-log",
912 .data = &compat_log,
913 .maxlen = sizeof (int),
914 .mode = 0644,
915 .proc_handler = proc_dointvec,
916 },
917 #endif
918 #ifdef CONFIG_RT_MUTEXES
919 {
920 .procname = "max_lock_depth",
921 .data = &max_lock_depth,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec,
925 },
926 #endif
927 {
928 .procname = "poweroff_cmd",
929 .data = &poweroff_cmd,
930 .maxlen = POWEROFF_CMD_PATH_LEN,
931 .mode = 0644,
932 .proc_handler = proc_dostring,
933 },
934 #ifdef CONFIG_KEYS
935 {
936 .procname = "keys",
937 .mode = 0555,
938 .child = key_sysctls,
939 },
940 #endif
941 #ifdef CONFIG_RCU_TORTURE_TEST
942 {
943 .procname = "rcutorture_runnable",
944 .data = &rcutorture_runnable,
945 .maxlen = sizeof(int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec,
948 },
949 #endif
950 #ifdef CONFIG_PERF_EVENTS
951 /*
952 * User-space scripts rely on the existence of this file
953 * as a feature check for perf_events being enabled.
954 *
955 * So it's an ABI, do not remove!
956 */
957 {
958 .procname = "perf_event_paranoid",
959 .data = &sysctl_perf_event_paranoid,
960 .maxlen = sizeof(sysctl_perf_event_paranoid),
961 .mode = 0644,
962 .proc_handler = proc_dointvec,
963 },
964 {
965 .procname = "perf_event_mlock_kb",
966 .data = &sysctl_perf_event_mlock,
967 .maxlen = sizeof(sysctl_perf_event_mlock),
968 .mode = 0644,
969 .proc_handler = proc_dointvec,
970 },
971 {
972 .procname = "perf_event_max_sample_rate",
973 .data = &sysctl_perf_event_sample_rate,
974 .maxlen = sizeof(sysctl_perf_event_sample_rate),
975 .mode = 0644,
976 .proc_handler = perf_proc_update_handler,
977 },
978 #endif
979 #ifdef CONFIG_KMEMCHECK
980 {
981 .procname = "kmemcheck",
982 .data = &kmemcheck_enabled,
983 .maxlen = sizeof(int),
984 .mode = 0644,
985 .proc_handler = proc_dointvec,
986 },
987 #endif
988 #ifdef CONFIG_BLOCK
989 {
990 .procname = "blk_iopoll",
991 .data = &blk_iopoll_enabled,
992 .maxlen = sizeof(int),
993 .mode = 0644,
994 .proc_handler = proc_dointvec,
995 },
996 #endif
997 { }
998 };
999
1000 static struct ctl_table vm_table[] = {
1001 {
1002 .procname = "overcommit_memory",
1003 .data = &sysctl_overcommit_memory,
1004 .maxlen = sizeof(sysctl_overcommit_memory),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec_minmax,
1007 .extra1 = &zero,
1008 .extra2 = &two,
1009 },
1010 {
1011 .procname = "panic_on_oom",
1012 .data = &sysctl_panic_on_oom,
1013 .maxlen = sizeof(sysctl_panic_on_oom),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec_minmax,
1016 .extra1 = &zero,
1017 .extra2 = &two,
1018 },
1019 {
1020 .procname = "oom_kill_allocating_task",
1021 .data = &sysctl_oom_kill_allocating_task,
1022 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1023 .mode = 0644,
1024 .proc_handler = proc_dointvec,
1025 },
1026 {
1027 .procname = "oom_dump_tasks",
1028 .data = &sysctl_oom_dump_tasks,
1029 .maxlen = sizeof(sysctl_oom_dump_tasks),
1030 .mode = 0644,
1031 .proc_handler = proc_dointvec,
1032 },
1033 {
1034 .procname = "overcommit_ratio",
1035 .data = &sysctl_overcommit_ratio,
1036 .maxlen = sizeof(sysctl_overcommit_ratio),
1037 .mode = 0644,
1038 .proc_handler = proc_dointvec,
1039 },
1040 {
1041 .procname = "page-cluster",
1042 .data = &page_cluster,
1043 .maxlen = sizeof(int),
1044 .mode = 0644,
1045 .proc_handler = proc_dointvec_minmax,
1046 .extra1 = &zero,
1047 },
1048 {
1049 .procname = "dirty_background_ratio",
1050 .data = &dirty_background_ratio,
1051 .maxlen = sizeof(dirty_background_ratio),
1052 .mode = 0644,
1053 .proc_handler = dirty_background_ratio_handler,
1054 .extra1 = &zero,
1055 .extra2 = &one_hundred,
1056 },
1057 {
1058 .procname = "dirty_background_bytes",
1059 .data = &dirty_background_bytes,
1060 .maxlen = sizeof(dirty_background_bytes),
1061 .mode = 0644,
1062 .proc_handler = dirty_background_bytes_handler,
1063 .extra1 = &one_ul,
1064 },
1065 {
1066 .procname = "dirty_ratio",
1067 .data = &vm_dirty_ratio,
1068 .maxlen = sizeof(vm_dirty_ratio),
1069 .mode = 0644,
1070 .proc_handler = dirty_ratio_handler,
1071 .extra1 = &zero,
1072 .extra2 = &one_hundred,
1073 },
1074 {
1075 .procname = "dirty_bytes",
1076 .data = &vm_dirty_bytes,
1077 .maxlen = sizeof(vm_dirty_bytes),
1078 .mode = 0644,
1079 .proc_handler = dirty_bytes_handler,
1080 .extra1 = &dirty_bytes_min,
1081 },
1082 {
1083 .procname = "dirty_writeback_centisecs",
1084 .data = &dirty_writeback_interval,
1085 .maxlen = sizeof(dirty_writeback_interval),
1086 .mode = 0644,
1087 .proc_handler = dirty_writeback_centisecs_handler,
1088 },
1089 {
1090 .procname = "dirty_expire_centisecs",
1091 .data = &dirty_expire_interval,
1092 .maxlen = sizeof(dirty_expire_interval),
1093 .mode = 0644,
1094 .proc_handler = proc_dointvec_minmax,
1095 .extra1 = &zero,
1096 },
1097 {
1098 .procname = "nr_pdflush_threads",
1099 .data = &nr_pdflush_threads,
1100 .maxlen = sizeof nr_pdflush_threads,
1101 .mode = 0444 /* read-only*/,
1102 .proc_handler = proc_dointvec,
1103 },
1104 {
1105 .procname = "swappiness",
1106 .data = &vm_swappiness,
1107 .maxlen = sizeof(vm_swappiness),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec_minmax,
1110 .extra1 = &zero,
1111 .extra2 = &one_hundred,
1112 },
1113 #ifdef CONFIG_HUGETLB_PAGE
1114 {
1115 .procname = "nr_hugepages",
1116 .data = NULL,
1117 .maxlen = sizeof(unsigned long),
1118 .mode = 0644,
1119 .proc_handler = hugetlb_sysctl_handler,
1120 .extra1 = (void *)&hugetlb_zero,
1121 .extra2 = (void *)&hugetlb_infinity,
1122 },
1123 #ifdef CONFIG_NUMA
1124 {
1125 .procname = "nr_hugepages_mempolicy",
1126 .data = NULL,
1127 .maxlen = sizeof(unsigned long),
1128 .mode = 0644,
1129 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1130 .extra1 = (void *)&hugetlb_zero,
1131 .extra2 = (void *)&hugetlb_infinity,
1132 },
1133 #endif
1134 {
1135 .procname = "hugetlb_shm_group",
1136 .data = &sysctl_hugetlb_shm_group,
1137 .maxlen = sizeof(gid_t),
1138 .mode = 0644,
1139 .proc_handler = proc_dointvec,
1140 },
1141 {
1142 .procname = "hugepages_treat_as_movable",
1143 .data = &hugepages_treat_as_movable,
1144 .maxlen = sizeof(int),
1145 .mode = 0644,
1146 .proc_handler = hugetlb_treat_movable_handler,
1147 },
1148 {
1149 .procname = "nr_overcommit_hugepages",
1150 .data = NULL,
1151 .maxlen = sizeof(unsigned long),
1152 .mode = 0644,
1153 .proc_handler = hugetlb_overcommit_handler,
1154 .extra1 = (void *)&hugetlb_zero,
1155 .extra2 = (void *)&hugetlb_infinity,
1156 },
1157 #endif
1158 {
1159 .procname = "lowmem_reserve_ratio",
1160 .data = &sysctl_lowmem_reserve_ratio,
1161 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1162 .mode = 0644,
1163 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1164 },
1165 {
1166 .procname = "drop_caches",
1167 .data = &sysctl_drop_caches,
1168 .maxlen = sizeof(int),
1169 .mode = 0644,
1170 .proc_handler = drop_caches_sysctl_handler,
1171 .extra1 = &one,
1172 .extra2 = &three,
1173 },
1174 #ifdef CONFIG_COMPACTION
1175 {
1176 .procname = "compact_memory",
1177 .data = &sysctl_compact_memory,
1178 .maxlen = sizeof(int),
1179 .mode = 0200,
1180 .proc_handler = sysctl_compaction_handler,
1181 },
1182 {
1183 .procname = "extfrag_threshold",
1184 .data = &sysctl_extfrag_threshold,
1185 .maxlen = sizeof(int),
1186 .mode = 0644,
1187 .proc_handler = sysctl_extfrag_handler,
1188 .extra1 = &min_extfrag_threshold,
1189 .extra2 = &max_extfrag_threshold,
1190 },
1191
1192 #endif /* CONFIG_COMPACTION */
1193 {
1194 .procname = "min_free_kbytes",
1195 .data = &min_free_kbytes,
1196 .maxlen = sizeof(min_free_kbytes),
1197 .mode = 0644,
1198 .proc_handler = min_free_kbytes_sysctl_handler,
1199 .extra1 = &zero,
1200 },
1201 {
1202 .procname = "percpu_pagelist_fraction",
1203 .data = &percpu_pagelist_fraction,
1204 .maxlen = sizeof(percpu_pagelist_fraction),
1205 .mode = 0644,
1206 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1207 .extra1 = &min_percpu_pagelist_fract,
1208 },
1209 #ifdef CONFIG_MMU
1210 {
1211 .procname = "max_map_count",
1212 .data = &sysctl_max_map_count,
1213 .maxlen = sizeof(sysctl_max_map_count),
1214 .mode = 0644,
1215 .proc_handler = proc_dointvec_minmax,
1216 .extra1 = &zero,
1217 },
1218 #else
1219 {
1220 .procname = "nr_trim_pages",
1221 .data = &sysctl_nr_trim_pages,
1222 .maxlen = sizeof(sysctl_nr_trim_pages),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec_minmax,
1225 .extra1 = &zero,
1226 },
1227 #endif
1228 {
1229 .procname = "laptop_mode",
1230 .data = &laptop_mode,
1231 .maxlen = sizeof(laptop_mode),
1232 .mode = 0644,
1233 .proc_handler = proc_dointvec_jiffies,
1234 },
1235 {
1236 .procname = "block_dump",
1237 .data = &block_dump,
1238 .maxlen = sizeof(block_dump),
1239 .mode = 0644,
1240 .proc_handler = proc_dointvec,
1241 .extra1 = &zero,
1242 },
1243 {
1244 .procname = "vfs_cache_pressure",
1245 .data = &sysctl_vfs_cache_pressure,
1246 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1247 .mode = 0644,
1248 .proc_handler = proc_dointvec,
1249 .extra1 = &zero,
1250 },
1251 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1252 {
1253 .procname = "legacy_va_layout",
1254 .data = &sysctl_legacy_va_layout,
1255 .maxlen = sizeof(sysctl_legacy_va_layout),
1256 .mode = 0644,
1257 .proc_handler = proc_dointvec,
1258 .extra1 = &zero,
1259 },
1260 #endif
1261 #ifdef CONFIG_NUMA
1262 {
1263 .procname = "zone_reclaim_mode",
1264 .data = &zone_reclaim_mode,
1265 .maxlen = sizeof(zone_reclaim_mode),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec,
1268 .extra1 = &zero,
1269 },
1270 {
1271 .procname = "min_unmapped_ratio",
1272 .data = &sysctl_min_unmapped_ratio,
1273 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1274 .mode = 0644,
1275 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1276 .extra1 = &zero,
1277 .extra2 = &one_hundred,
1278 },
1279 {
1280 .procname = "min_slab_ratio",
1281 .data = &sysctl_min_slab_ratio,
1282 .maxlen = sizeof(sysctl_min_slab_ratio),
1283 .mode = 0644,
1284 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1285 .extra1 = &zero,
1286 .extra2 = &one_hundred,
1287 },
1288 #endif
1289 #ifdef CONFIG_SMP
1290 {
1291 .procname = "stat_interval",
1292 .data = &sysctl_stat_interval,
1293 .maxlen = sizeof(sysctl_stat_interval),
1294 .mode = 0644,
1295 .proc_handler = proc_dointvec_jiffies,
1296 },
1297 #endif
1298 #ifdef CONFIG_MMU
1299 {
1300 .procname = "mmap_min_addr",
1301 .data = &dac_mmap_min_addr,
1302 .maxlen = sizeof(unsigned long),
1303 .mode = 0644,
1304 .proc_handler = mmap_min_addr_handler,
1305 },
1306 #endif
1307 #ifdef CONFIG_NUMA
1308 {
1309 .procname = "numa_zonelist_order",
1310 .data = &numa_zonelist_order,
1311 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1312 .mode = 0644,
1313 .proc_handler = numa_zonelist_order_handler,
1314 },
1315 #endif
1316 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1317 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1318 {
1319 .procname = "vdso_enabled",
1320 .data = &vdso_enabled,
1321 .maxlen = sizeof(vdso_enabled),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec,
1324 .extra1 = &zero,
1325 },
1326 #endif
1327 #ifdef CONFIG_HIGHMEM
1328 {
1329 .procname = "highmem_is_dirtyable",
1330 .data = &vm_highmem_is_dirtyable,
1331 .maxlen = sizeof(vm_highmem_is_dirtyable),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec_minmax,
1334 .extra1 = &zero,
1335 .extra2 = &one,
1336 },
1337 #endif
1338 {
1339 .procname = "scan_unevictable_pages",
1340 .data = &scan_unevictable_pages,
1341 .maxlen = sizeof(scan_unevictable_pages),
1342 .mode = 0644,
1343 .proc_handler = scan_unevictable_handler,
1344 },
1345 #ifdef CONFIG_MEMORY_FAILURE
1346 {
1347 .procname = "memory_failure_early_kill",
1348 .data = &sysctl_memory_failure_early_kill,
1349 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1350 .mode = 0644,
1351 .proc_handler = proc_dointvec_minmax,
1352 .extra1 = &zero,
1353 .extra2 = &one,
1354 },
1355 {
1356 .procname = "memory_failure_recovery",
1357 .data = &sysctl_memory_failure_recovery,
1358 .maxlen = sizeof(sysctl_memory_failure_recovery),
1359 .mode = 0644,
1360 .proc_handler = proc_dointvec_minmax,
1361 .extra1 = &zero,
1362 .extra2 = &one,
1363 },
1364 #endif
1365 { }
1366 };
1367
1368 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1369 static struct ctl_table binfmt_misc_table[] = {
1370 { }
1371 };
1372 #endif
1373
1374 static struct ctl_table fs_table[] = {
1375 {
1376 .procname = "inode-nr",
1377 .data = &inodes_stat,
1378 .maxlen = 2*sizeof(int),
1379 .mode = 0444,
1380 .proc_handler = proc_nr_inodes,
1381 },
1382 {
1383 .procname = "inode-state",
1384 .data = &inodes_stat,
1385 .maxlen = 7*sizeof(int),
1386 .mode = 0444,
1387 .proc_handler = proc_nr_inodes,
1388 },
1389 {
1390 .procname = "file-nr",
1391 .data = &files_stat,
1392 .maxlen = sizeof(files_stat),
1393 .mode = 0444,
1394 .proc_handler = proc_nr_files,
1395 },
1396 {
1397 .procname = "file-max",
1398 .data = &files_stat.max_files,
1399 .maxlen = sizeof(files_stat.max_files),
1400 .mode = 0644,
1401 .proc_handler = proc_doulongvec_minmax,
1402 },
1403 {
1404 .procname = "nr_open",
1405 .data = &sysctl_nr_open,
1406 .maxlen = sizeof(int),
1407 .mode = 0644,
1408 .proc_handler = proc_dointvec_minmax,
1409 .extra1 = &sysctl_nr_open_min,
1410 .extra2 = &sysctl_nr_open_max,
1411 },
1412 {
1413 .procname = "dentry-state",
1414 .data = &dentry_stat,
1415 .maxlen = 6*sizeof(int),
1416 .mode = 0444,
1417 .proc_handler = proc_nr_dentry,
1418 },
1419 {
1420 .procname = "overflowuid",
1421 .data = &fs_overflowuid,
1422 .maxlen = sizeof(int),
1423 .mode = 0644,
1424 .proc_handler = proc_dointvec_minmax,
1425 .extra1 = &minolduid,
1426 .extra2 = &maxolduid,
1427 },
1428 {
1429 .procname = "overflowgid",
1430 .data = &fs_overflowgid,
1431 .maxlen = sizeof(int),
1432 .mode = 0644,
1433 .proc_handler = proc_dointvec_minmax,
1434 .extra1 = &minolduid,
1435 .extra2 = &maxolduid,
1436 },
1437 #ifdef CONFIG_FILE_LOCKING
1438 {
1439 .procname = "leases-enable",
1440 .data = &leases_enable,
1441 .maxlen = sizeof(int),
1442 .mode = 0644,
1443 .proc_handler = proc_dointvec,
1444 },
1445 #endif
1446 #ifdef CONFIG_DNOTIFY
1447 {
1448 .procname = "dir-notify-enable",
1449 .data = &dir_notify_enable,
1450 .maxlen = sizeof(int),
1451 .mode = 0644,
1452 .proc_handler = proc_dointvec,
1453 },
1454 #endif
1455 #ifdef CONFIG_MMU
1456 #ifdef CONFIG_FILE_LOCKING
1457 {
1458 .procname = "lease-break-time",
1459 .data = &lease_break_time,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec,
1463 },
1464 #endif
1465 #ifdef CONFIG_AIO
1466 {
1467 .procname = "aio-nr",
1468 .data = &aio_nr,
1469 .maxlen = sizeof(aio_nr),
1470 .mode = 0444,
1471 .proc_handler = proc_doulongvec_minmax,
1472 },
1473 {
1474 .procname = "aio-max-nr",
1475 .data = &aio_max_nr,
1476 .maxlen = sizeof(aio_max_nr),
1477 .mode = 0644,
1478 .proc_handler = proc_doulongvec_minmax,
1479 },
1480 #endif /* CONFIG_AIO */
1481 #ifdef CONFIG_INOTIFY_USER
1482 {
1483 .procname = "inotify",
1484 .mode = 0555,
1485 .child = inotify_table,
1486 },
1487 #endif
1488 #ifdef CONFIG_EPOLL
1489 {
1490 .procname = "epoll",
1491 .mode = 0555,
1492 .child = epoll_table,
1493 },
1494 #endif
1495 #endif
1496 {
1497 .procname = "suid_dumpable",
1498 .data = &suid_dumpable,
1499 .maxlen = sizeof(int),
1500 .mode = 0644,
1501 .proc_handler = proc_dointvec_minmax,
1502 .extra1 = &zero,
1503 .extra2 = &two,
1504 },
1505 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1506 {
1507 .procname = "binfmt_misc",
1508 .mode = 0555,
1509 .child = binfmt_misc_table,
1510 },
1511 #endif
1512 {
1513 .procname = "pipe-max-size",
1514 .data = &pipe_max_size,
1515 .maxlen = sizeof(int),
1516 .mode = 0644,
1517 .proc_handler = &pipe_proc_fn,
1518 .extra1 = &pipe_min_size,
1519 },
1520 { }
1521 };
1522
1523 static struct ctl_table debug_table[] = {
1524 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1525 defined(CONFIG_S390) || defined(CONFIG_TILE)
1526 {
1527 .procname = "exception-trace",
1528 .data = &show_unhandled_signals,
1529 .maxlen = sizeof(int),
1530 .mode = 0644,
1531 .proc_handler = proc_dointvec
1532 },
1533 #endif
1534 #if defined(CONFIG_OPTPROBES)
1535 {
1536 .procname = "kprobes-optimization",
1537 .data = &sysctl_kprobes_optimization,
1538 .maxlen = sizeof(int),
1539 .mode = 0644,
1540 .proc_handler = proc_kprobes_optimization_handler,
1541 .extra1 = &zero,
1542 .extra2 = &one,
1543 },
1544 #endif
1545 { }
1546 };
1547
1548 static struct ctl_table dev_table[] = {
1549 { }
1550 };
1551
1552 int __init sysctl_init(void)
1553 {
1554 register_sysctl_table(sysctl_base_table);
1555 return 0;
1556 }
1557
1558 #endif /* CONFIG_SYSCTL */
1559
1560 /*
1561 * /proc/sys support
1562 */
1563
1564 #ifdef CONFIG_PROC_SYSCTL
1565
1566 static int _proc_do_string(void* data, int maxlen, int write,
1567 void __user *buffer,
1568 size_t *lenp, loff_t *ppos)
1569 {
1570 size_t len;
1571 char __user *p;
1572 char c;
1573
1574 if (!data || !maxlen || !*lenp) {
1575 *lenp = 0;
1576 return 0;
1577 }
1578
1579 if (write) {
1580 len = 0;
1581 p = buffer;
1582 while (len < *lenp) {
1583 if (get_user(c, p++))
1584 return -EFAULT;
1585 if (c == 0 || c == '\n')
1586 break;
1587 len++;
1588 }
1589 if (len >= maxlen)
1590 len = maxlen-1;
1591 if(copy_from_user(data, buffer, len))
1592 return -EFAULT;
1593 ((char *) data)[len] = 0;
1594 *ppos += *lenp;
1595 } else {
1596 len = strlen(data);
1597 if (len > maxlen)
1598 len = maxlen;
1599
1600 if (*ppos > len) {
1601 *lenp = 0;
1602 return 0;
1603 }
1604
1605 data += *ppos;
1606 len -= *ppos;
1607
1608 if (len > *lenp)
1609 len = *lenp;
1610 if (len)
1611 if(copy_to_user(buffer, data, len))
1612 return -EFAULT;
1613 if (len < *lenp) {
1614 if(put_user('\n', ((char __user *) buffer) + len))
1615 return -EFAULT;
1616 len++;
1617 }
1618 *lenp = len;
1619 *ppos += len;
1620 }
1621 return 0;
1622 }
1623
1624 /**
1625 * proc_dostring - read a string sysctl
1626 * @table: the sysctl table
1627 * @write: %TRUE if this is a write to the sysctl file
1628 * @buffer: the user buffer
1629 * @lenp: the size of the user buffer
1630 * @ppos: file position
1631 *
1632 * Reads/writes a string from/to the user buffer. If the kernel
1633 * buffer provided is not large enough to hold the string, the
1634 * string is truncated. The copied string is %NULL-terminated.
1635 * If the string is being read by the user process, it is copied
1636 * and a newline '\n' is added. It is truncated if the buffer is
1637 * not large enough.
1638 *
1639 * Returns 0 on success.
1640 */
1641 int proc_dostring(struct ctl_table *table, int write,
1642 void __user *buffer, size_t *lenp, loff_t *ppos)
1643 {
1644 return _proc_do_string(table->data, table->maxlen, write,
1645 buffer, lenp, ppos);
1646 }
1647
1648 static size_t proc_skip_spaces(char **buf)
1649 {
1650 size_t ret;
1651 char *tmp = skip_spaces(*buf);
1652 ret = tmp - *buf;
1653 *buf = tmp;
1654 return ret;
1655 }
1656
1657 static void proc_skip_char(char **buf, size_t *size, const char v)
1658 {
1659 while (*size) {
1660 if (**buf != v)
1661 break;
1662 (*size)--;
1663 (*buf)++;
1664 }
1665 }
1666
1667 #define TMPBUFLEN 22
1668 /**
1669 * proc_get_long - reads an ASCII formatted integer from a user buffer
1670 *
1671 * @buf: a kernel buffer
1672 * @size: size of the kernel buffer
1673 * @val: this is where the number will be stored
1674 * @neg: set to %TRUE if number is negative
1675 * @perm_tr: a vector which contains the allowed trailers
1676 * @perm_tr_len: size of the perm_tr vector
1677 * @tr: pointer to store the trailer character
1678 *
1679 * In case of success %0 is returned and @buf and @size are updated with
1680 * the amount of bytes read. If @tr is non-NULL and a trailing
1681 * character exists (size is non-zero after returning from this
1682 * function), @tr is updated with the trailing character.
1683 */
1684 static int proc_get_long(char **buf, size_t *size,
1685 unsigned long *val, bool *neg,
1686 const char *perm_tr, unsigned perm_tr_len, char *tr)
1687 {
1688 int len;
1689 char *p, tmp[TMPBUFLEN];
1690
1691 if (!*size)
1692 return -EINVAL;
1693
1694 len = *size;
1695 if (len > TMPBUFLEN - 1)
1696 len = TMPBUFLEN - 1;
1697
1698 memcpy(tmp, *buf, len);
1699
1700 tmp[len] = 0;
1701 p = tmp;
1702 if (*p == '-' && *size > 1) {
1703 *neg = true;
1704 p++;
1705 } else
1706 *neg = false;
1707 if (!isdigit(*p))
1708 return -EINVAL;
1709
1710 *val = simple_strtoul(p, &p, 0);
1711
1712 len = p - tmp;
1713
1714 /* We don't know if the next char is whitespace thus we may accept
1715 * invalid integers (e.g. 1234...a) or two integers instead of one
1716 * (e.g. 123...1). So lets not allow such large numbers. */
1717 if (len == TMPBUFLEN - 1)
1718 return -EINVAL;
1719
1720 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1721 return -EINVAL;
1722
1723 if (tr && (len < *size))
1724 *tr = *p;
1725
1726 *buf += len;
1727 *size -= len;
1728
1729 return 0;
1730 }
1731
1732 /**
1733 * proc_put_long - converts an integer to a decimal ASCII formatted string
1734 *
1735 * @buf: the user buffer
1736 * @size: the size of the user buffer
1737 * @val: the integer to be converted
1738 * @neg: sign of the number, %TRUE for negative
1739 *
1740 * In case of success %0 is returned and @buf and @size are updated with
1741 * the amount of bytes written.
1742 */
1743 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1744 bool neg)
1745 {
1746 int len;
1747 char tmp[TMPBUFLEN], *p = tmp;
1748
1749 sprintf(p, "%s%lu", neg ? "-" : "", val);
1750 len = strlen(tmp);
1751 if (len > *size)
1752 len = *size;
1753 if (copy_to_user(*buf, tmp, len))
1754 return -EFAULT;
1755 *size -= len;
1756 *buf += len;
1757 return 0;
1758 }
1759 #undef TMPBUFLEN
1760
1761 static int proc_put_char(void __user **buf, size_t *size, char c)
1762 {
1763 if (*size) {
1764 char __user **buffer = (char __user **)buf;
1765 if (put_user(c, *buffer))
1766 return -EFAULT;
1767 (*size)--, (*buffer)++;
1768 *buf = *buffer;
1769 }
1770 return 0;
1771 }
1772
1773 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1774 int *valp,
1775 int write, void *data)
1776 {
1777 if (write) {
1778 *valp = *negp ? -*lvalp : *lvalp;
1779 } else {
1780 int val = *valp;
1781 if (val < 0) {
1782 *negp = true;
1783 *lvalp = (unsigned long)-val;
1784 } else {
1785 *negp = false;
1786 *lvalp = (unsigned long)val;
1787 }
1788 }
1789 return 0;
1790 }
1791
1792 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1793
1794 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1795 int write, void __user *buffer,
1796 size_t *lenp, loff_t *ppos,
1797 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1798 int write, void *data),
1799 void *data)
1800 {
1801 int *i, vleft, first = 1, err = 0;
1802 unsigned long page = 0;
1803 size_t left;
1804 char *kbuf;
1805
1806 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1807 *lenp = 0;
1808 return 0;
1809 }
1810
1811 i = (int *) tbl_data;
1812 vleft = table->maxlen / sizeof(*i);
1813 left = *lenp;
1814
1815 if (!conv)
1816 conv = do_proc_dointvec_conv;
1817
1818 if (write) {
1819 if (left > PAGE_SIZE - 1)
1820 left = PAGE_SIZE - 1;
1821 page = __get_free_page(GFP_TEMPORARY);
1822 kbuf = (char *) page;
1823 if (!kbuf)
1824 return -ENOMEM;
1825 if (copy_from_user(kbuf, buffer, left)) {
1826 err = -EFAULT;
1827 goto free;
1828 }
1829 kbuf[left] = 0;
1830 }
1831
1832 for (; left && vleft--; i++, first=0) {
1833 unsigned long lval;
1834 bool neg;
1835
1836 if (write) {
1837 left -= proc_skip_spaces(&kbuf);
1838
1839 if (!left)
1840 break;
1841 err = proc_get_long(&kbuf, &left, &lval, &neg,
1842 proc_wspace_sep,
1843 sizeof(proc_wspace_sep), NULL);
1844 if (err)
1845 break;
1846 if (conv(&neg, &lval, i, 1, data)) {
1847 err = -EINVAL;
1848 break;
1849 }
1850 } else {
1851 if (conv(&neg, &lval, i, 0, data)) {
1852 err = -EINVAL;
1853 break;
1854 }
1855 if (!first)
1856 err = proc_put_char(&buffer, &left, '\t');
1857 if (err)
1858 break;
1859 err = proc_put_long(&buffer, &left, lval, neg);
1860 if (err)
1861 break;
1862 }
1863 }
1864
1865 if (!write && !first && left && !err)
1866 err = proc_put_char(&buffer, &left, '\n');
1867 if (write && !err && left)
1868 left -= proc_skip_spaces(&kbuf);
1869 free:
1870 if (write) {
1871 free_page(page);
1872 if (first)
1873 return err ? : -EINVAL;
1874 }
1875 *lenp -= left;
1876 *ppos += *lenp;
1877 return err;
1878 }
1879
1880 static int do_proc_dointvec(struct ctl_table *table, int write,
1881 void __user *buffer, size_t *lenp, loff_t *ppos,
1882 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1883 int write, void *data),
1884 void *data)
1885 {
1886 return __do_proc_dointvec(table->data, table, write,
1887 buffer, lenp, ppos, conv, data);
1888 }
1889
1890 /**
1891 * proc_dointvec - read a vector of integers
1892 * @table: the sysctl table
1893 * @write: %TRUE if this is a write to the sysctl file
1894 * @buffer: the user buffer
1895 * @lenp: the size of the user buffer
1896 * @ppos: file position
1897 *
1898 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1899 * values from/to the user buffer, treated as an ASCII string.
1900 *
1901 * Returns 0 on success.
1902 */
1903 int proc_dointvec(struct ctl_table *table, int write,
1904 void __user *buffer, size_t *lenp, loff_t *ppos)
1905 {
1906 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1907 NULL,NULL);
1908 }
1909
1910 /*
1911 * Taint values can only be increased
1912 * This means we can safely use a temporary.
1913 */
1914 static int proc_taint(struct ctl_table *table, int write,
1915 void __user *buffer, size_t *lenp, loff_t *ppos)
1916 {
1917 struct ctl_table t;
1918 unsigned long tmptaint = get_taint();
1919 int err;
1920
1921 if (write && !capable(CAP_SYS_ADMIN))
1922 return -EPERM;
1923
1924 t = *table;
1925 t.data = &tmptaint;
1926 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1927 if (err < 0)
1928 return err;
1929
1930 if (write) {
1931 /*
1932 * Poor man's atomic or. Not worth adding a primitive
1933 * to everyone's atomic.h for this
1934 */
1935 int i;
1936 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1937 if ((tmptaint >> i) & 1)
1938 add_taint(i);
1939 }
1940 }
1941
1942 return err;
1943 }
1944
1945 #ifdef CONFIG_PRINTK
1946 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1947 void __user *buffer, size_t *lenp, loff_t *ppos)
1948 {
1949 if (write && !capable(CAP_SYS_ADMIN))
1950 return -EPERM;
1951
1952 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1953 }
1954 #endif
1955
1956 struct do_proc_dointvec_minmax_conv_param {
1957 int *min;
1958 int *max;
1959 };
1960
1961 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1962 int *valp,
1963 int write, void *data)
1964 {
1965 struct do_proc_dointvec_minmax_conv_param *param = data;
1966 if (write) {
1967 int val = *negp ? -*lvalp : *lvalp;
1968 if ((param->min && *param->min > val) ||
1969 (param->max && *param->max < val))
1970 return -EINVAL;
1971 *valp = val;
1972 } else {
1973 int val = *valp;
1974 if (val < 0) {
1975 *negp = true;
1976 *lvalp = (unsigned long)-val;
1977 } else {
1978 *negp = false;
1979 *lvalp = (unsigned long)val;
1980 }
1981 }
1982 return 0;
1983 }
1984
1985 /**
1986 * proc_dointvec_minmax - read a vector of integers with min/max values
1987 * @table: the sysctl table
1988 * @write: %TRUE if this is a write to the sysctl file
1989 * @buffer: the user buffer
1990 * @lenp: the size of the user buffer
1991 * @ppos: file position
1992 *
1993 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1994 * values from/to the user buffer, treated as an ASCII string.
1995 *
1996 * This routine will ensure the values are within the range specified by
1997 * table->extra1 (min) and table->extra2 (max).
1998 *
1999 * Returns 0 on success.
2000 */
2001 int proc_dointvec_minmax(struct ctl_table *table, int write,
2002 void __user *buffer, size_t *lenp, loff_t *ppos)
2003 {
2004 struct do_proc_dointvec_minmax_conv_param param = {
2005 .min = (int *) table->extra1,
2006 .max = (int *) table->extra2,
2007 };
2008 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2009 do_proc_dointvec_minmax_conv, &param);
2010 }
2011
2012 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2013 void __user *buffer,
2014 size_t *lenp, loff_t *ppos,
2015 unsigned long convmul,
2016 unsigned long convdiv)
2017 {
2018 unsigned long *i, *min, *max;
2019 int vleft, first = 1, err = 0;
2020 unsigned long page = 0;
2021 size_t left;
2022 char *kbuf;
2023
2024 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2025 *lenp = 0;
2026 return 0;
2027 }
2028
2029 i = (unsigned long *) data;
2030 min = (unsigned long *) table->extra1;
2031 max = (unsigned long *) table->extra2;
2032 vleft = table->maxlen / sizeof(unsigned long);
2033 left = *lenp;
2034
2035 if (write) {
2036 if (left > PAGE_SIZE - 1)
2037 left = PAGE_SIZE - 1;
2038 page = __get_free_page(GFP_TEMPORARY);
2039 kbuf = (char *) page;
2040 if (!kbuf)
2041 return -ENOMEM;
2042 if (copy_from_user(kbuf, buffer, left)) {
2043 err = -EFAULT;
2044 goto free;
2045 }
2046 kbuf[left] = 0;
2047 }
2048
2049 for (; left && vleft--; i++, first = 0) {
2050 unsigned long val;
2051
2052 if (write) {
2053 bool neg;
2054
2055 left -= proc_skip_spaces(&kbuf);
2056
2057 err = proc_get_long(&kbuf, &left, &val, &neg,
2058 proc_wspace_sep,
2059 sizeof(proc_wspace_sep), NULL);
2060 if (err)
2061 break;
2062 if (neg)
2063 continue;
2064 if ((min && val < *min) || (max && val > *max))
2065 continue;
2066 *i = val;
2067 } else {
2068 val = convdiv * (*i) / convmul;
2069 if (!first)
2070 err = proc_put_char(&buffer, &left, '\t');
2071 err = proc_put_long(&buffer, &left, val, false);
2072 if (err)
2073 break;
2074 }
2075 }
2076
2077 if (!write && !first && left && !err)
2078 err = proc_put_char(&buffer, &left, '\n');
2079 if (write && !err)
2080 left -= proc_skip_spaces(&kbuf);
2081 free:
2082 if (write) {
2083 free_page(page);
2084 if (first)
2085 return err ? : -EINVAL;
2086 }
2087 *lenp -= left;
2088 *ppos += *lenp;
2089 return err;
2090 }
2091
2092 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2093 void __user *buffer,
2094 size_t *lenp, loff_t *ppos,
2095 unsigned long convmul,
2096 unsigned long convdiv)
2097 {
2098 return __do_proc_doulongvec_minmax(table->data, table, write,
2099 buffer, lenp, ppos, convmul, convdiv);
2100 }
2101
2102 /**
2103 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2104 * @table: the sysctl table
2105 * @write: %TRUE if this is a write to the sysctl file
2106 * @buffer: the user buffer
2107 * @lenp: the size of the user buffer
2108 * @ppos: file position
2109 *
2110 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2111 * values from/to the user buffer, treated as an ASCII string.
2112 *
2113 * This routine will ensure the values are within the range specified by
2114 * table->extra1 (min) and table->extra2 (max).
2115 *
2116 * Returns 0 on success.
2117 */
2118 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2120 {
2121 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2122 }
2123
2124 /**
2125 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2126 * @table: the sysctl table
2127 * @write: %TRUE if this is a write to the sysctl file
2128 * @buffer: the user buffer
2129 * @lenp: the size of the user buffer
2130 * @ppos: file position
2131 *
2132 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2133 * values from/to the user buffer, treated as an ASCII string. The values
2134 * are treated as milliseconds, and converted to jiffies when they are stored.
2135 *
2136 * This routine will ensure the values are within the range specified by
2137 * table->extra1 (min) and table->extra2 (max).
2138 *
2139 * Returns 0 on success.
2140 */
2141 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2142 void __user *buffer,
2143 size_t *lenp, loff_t *ppos)
2144 {
2145 return do_proc_doulongvec_minmax(table, write, buffer,
2146 lenp, ppos, HZ, 1000l);
2147 }
2148
2149
2150 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2151 int *valp,
2152 int write, void *data)
2153 {
2154 if (write) {
2155 if (*lvalp > LONG_MAX / HZ)
2156 return 1;
2157 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2158 } else {
2159 int val = *valp;
2160 unsigned long lval;
2161 if (val < 0) {
2162 *negp = true;
2163 lval = (unsigned long)-val;
2164 } else {
2165 *negp = false;
2166 lval = (unsigned long)val;
2167 }
2168 *lvalp = lval / HZ;
2169 }
2170 return 0;
2171 }
2172
2173 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2174 int *valp,
2175 int write, void *data)
2176 {
2177 if (write) {
2178 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2179 return 1;
2180 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2181 } else {
2182 int val = *valp;
2183 unsigned long lval;
2184 if (val < 0) {
2185 *negp = true;
2186 lval = (unsigned long)-val;
2187 } else {
2188 *negp = false;
2189 lval = (unsigned long)val;
2190 }
2191 *lvalp = jiffies_to_clock_t(lval);
2192 }
2193 return 0;
2194 }
2195
2196 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2197 int *valp,
2198 int write, void *data)
2199 {
2200 if (write) {
2201 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2202 } else {
2203 int val = *valp;
2204 unsigned long lval;
2205 if (val < 0) {
2206 *negp = true;
2207 lval = (unsigned long)-val;
2208 } else {
2209 *negp = false;
2210 lval = (unsigned long)val;
2211 }
2212 *lvalp = jiffies_to_msecs(lval);
2213 }
2214 return 0;
2215 }
2216
2217 /**
2218 * proc_dointvec_jiffies - read a vector of integers as seconds
2219 * @table: the sysctl table
2220 * @write: %TRUE if this is a write to the sysctl file
2221 * @buffer: the user buffer
2222 * @lenp: the size of the user buffer
2223 * @ppos: file position
2224 *
2225 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2226 * values from/to the user buffer, treated as an ASCII string.
2227 * The values read are assumed to be in seconds, and are converted into
2228 * jiffies.
2229 *
2230 * Returns 0 on success.
2231 */
2232 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2233 void __user *buffer, size_t *lenp, loff_t *ppos)
2234 {
2235 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2236 do_proc_dointvec_jiffies_conv,NULL);
2237 }
2238
2239 /**
2240 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2241 * @table: the sysctl table
2242 * @write: %TRUE if this is a write to the sysctl file
2243 * @buffer: the user buffer
2244 * @lenp: the size of the user buffer
2245 * @ppos: pointer to the file position
2246 *
2247 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2248 * values from/to the user buffer, treated as an ASCII string.
2249 * The values read are assumed to be in 1/USER_HZ seconds, and
2250 * are converted into jiffies.
2251 *
2252 * Returns 0 on success.
2253 */
2254 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2255 void __user *buffer, size_t *lenp, loff_t *ppos)
2256 {
2257 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2258 do_proc_dointvec_userhz_jiffies_conv,NULL);
2259 }
2260
2261 /**
2262 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2263 * @table: the sysctl table
2264 * @write: %TRUE if this is a write to the sysctl file
2265 * @buffer: the user buffer
2266 * @lenp: the size of the user buffer
2267 * @ppos: file position
2268 * @ppos: the current position in the file
2269 *
2270 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2271 * values from/to the user buffer, treated as an ASCII string.
2272 * The values read are assumed to be in 1/1000 seconds, and
2273 * are converted into jiffies.
2274 *
2275 * Returns 0 on success.
2276 */
2277 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2278 void __user *buffer, size_t *lenp, loff_t *ppos)
2279 {
2280 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2281 do_proc_dointvec_ms_jiffies_conv, NULL);
2282 }
2283
2284 static int proc_do_cad_pid(struct ctl_table *table, int write,
2285 void __user *buffer, size_t *lenp, loff_t *ppos)
2286 {
2287 struct pid *new_pid;
2288 pid_t tmp;
2289 int r;
2290
2291 tmp = pid_vnr(cad_pid);
2292
2293 r = __do_proc_dointvec(&tmp, table, write, buffer,
2294 lenp, ppos, NULL, NULL);
2295 if (r || !write)
2296 return r;
2297
2298 new_pid = find_get_pid(tmp);
2299 if (!new_pid)
2300 return -ESRCH;
2301
2302 put_pid(xchg(&cad_pid, new_pid));
2303 return 0;
2304 }
2305
2306 /**
2307 * proc_do_large_bitmap - read/write from/to a large bitmap
2308 * @table: the sysctl table
2309 * @write: %TRUE if this is a write to the sysctl file
2310 * @buffer: the user buffer
2311 * @lenp: the size of the user buffer
2312 * @ppos: file position
2313 *
2314 * The bitmap is stored at table->data and the bitmap length (in bits)
2315 * in table->maxlen.
2316 *
2317 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2318 * large bitmaps may be represented in a compact manner. Writing into
2319 * the file will clear the bitmap then update it with the given input.
2320 *
2321 * Returns 0 on success.
2322 */
2323 int proc_do_large_bitmap(struct ctl_table *table, int write,
2324 void __user *buffer, size_t *lenp, loff_t *ppos)
2325 {
2326 int err = 0;
2327 bool first = 1;
2328 size_t left = *lenp;
2329 unsigned long bitmap_len = table->maxlen;
2330 unsigned long *bitmap = (unsigned long *) table->data;
2331 unsigned long *tmp_bitmap = NULL;
2332 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2333
2334 if (!bitmap_len || !left || (*ppos && !write)) {
2335 *lenp = 0;
2336 return 0;
2337 }
2338
2339 if (write) {
2340 unsigned long page = 0;
2341 char *kbuf;
2342
2343 if (left > PAGE_SIZE - 1)
2344 left = PAGE_SIZE - 1;
2345
2346 page = __get_free_page(GFP_TEMPORARY);
2347 kbuf = (char *) page;
2348 if (!kbuf)
2349 return -ENOMEM;
2350 if (copy_from_user(kbuf, buffer, left)) {
2351 free_page(page);
2352 return -EFAULT;
2353 }
2354 kbuf[left] = 0;
2355
2356 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2357 GFP_KERNEL);
2358 if (!tmp_bitmap) {
2359 free_page(page);
2360 return -ENOMEM;
2361 }
2362 proc_skip_char(&kbuf, &left, '\n');
2363 while (!err && left) {
2364 unsigned long val_a, val_b;
2365 bool neg;
2366
2367 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2368 sizeof(tr_a), &c);
2369 if (err)
2370 break;
2371 if (val_a >= bitmap_len || neg) {
2372 err = -EINVAL;
2373 break;
2374 }
2375
2376 val_b = val_a;
2377 if (left) {
2378 kbuf++;
2379 left--;
2380 }
2381
2382 if (c == '-') {
2383 err = proc_get_long(&kbuf, &left, &val_b,
2384 &neg, tr_b, sizeof(tr_b),
2385 &c);
2386 if (err)
2387 break;
2388 if (val_b >= bitmap_len || neg ||
2389 val_a > val_b) {
2390 err = -EINVAL;
2391 break;
2392 }
2393 if (left) {
2394 kbuf++;
2395 left--;
2396 }
2397 }
2398
2399 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2400 first = 0;
2401 proc_skip_char(&kbuf, &left, '\n');
2402 }
2403 free_page(page);
2404 } else {
2405 unsigned long bit_a, bit_b = 0;
2406
2407 while (left) {
2408 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2409 if (bit_a >= bitmap_len)
2410 break;
2411 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2412 bit_a + 1) - 1;
2413
2414 if (!first) {
2415 err = proc_put_char(&buffer, &left, ',');
2416 if (err)
2417 break;
2418 }
2419 err = proc_put_long(&buffer, &left, bit_a, false);
2420 if (err)
2421 break;
2422 if (bit_a != bit_b) {
2423 err = proc_put_char(&buffer, &left, '-');
2424 if (err)
2425 break;
2426 err = proc_put_long(&buffer, &left, bit_b, false);
2427 if (err)
2428 break;
2429 }
2430
2431 first = 0; bit_b++;
2432 }
2433 if (!err)
2434 err = proc_put_char(&buffer, &left, '\n');
2435 }
2436
2437 if (!err) {
2438 if (write) {
2439 if (*ppos)
2440 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2441 else
2442 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2443 }
2444 kfree(tmp_bitmap);
2445 *lenp -= left;
2446 *ppos += *lenp;
2447 return 0;
2448 } else {
2449 kfree(tmp_bitmap);
2450 return err;
2451 }
2452 }
2453
2454 #else /* CONFIG_PROC_SYSCTL */
2455
2456 int proc_dostring(struct ctl_table *table, int write,
2457 void __user *buffer, size_t *lenp, loff_t *ppos)
2458 {
2459 return -ENOSYS;
2460 }
2461
2462 int proc_dointvec(struct ctl_table *table, int write,
2463 void __user *buffer, size_t *lenp, loff_t *ppos)
2464 {
2465 return -ENOSYS;
2466 }
2467
2468 int proc_dointvec_minmax(struct ctl_table *table, int write,
2469 void __user *buffer, size_t *lenp, loff_t *ppos)
2470 {
2471 return -ENOSYS;
2472 }
2473
2474 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2475 void __user *buffer, size_t *lenp, loff_t *ppos)
2476 {
2477 return -ENOSYS;
2478 }
2479
2480 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2481 void __user *buffer, size_t *lenp, loff_t *ppos)
2482 {
2483 return -ENOSYS;
2484 }
2485
2486 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2487 void __user *buffer, size_t *lenp, loff_t *ppos)
2488 {
2489 return -ENOSYS;
2490 }
2491
2492 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2493 void __user *buffer, size_t *lenp, loff_t *ppos)
2494 {
2495 return -ENOSYS;
2496 }
2497
2498 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2499 void __user *buffer,
2500 size_t *lenp, loff_t *ppos)
2501 {
2502 return -ENOSYS;
2503 }
2504
2505
2506 #endif /* CONFIG_PROC_SYSCTL */
2507
2508 /*
2509 * No sense putting this after each symbol definition, twice,
2510 * exception granted :-)
2511 */
2512 EXPORT_SYMBOL(proc_dointvec);
2513 EXPORT_SYMBOL(proc_dointvec_jiffies);
2514 EXPORT_SYMBOL(proc_dointvec_minmax);
2515 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2516 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2517 EXPORT_SYMBOL(proc_dostring);
2518 EXPORT_SYMBOL(proc_doulongvec_minmax);
2519 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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