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x86: kvm guest: pvclock vsyscall support
[linux-2.6.git] / kernel / sysctl.c
blob26f65eaa01f9c94366aa5156f9c304bbc589808f
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 = 0644,
371 .proc_handler = proc_dointvec_minmax,
372 .extra1 = &zero,
373 .extra2 = &one,
374 },
375 #endif
376 #ifdef CONFIG_CFS_BANDWIDTH
377 {
378 .procname = "sched_cfs_bandwidth_slice_us",
379 .data = &sysctl_sched_cfs_bandwidth_slice,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec_minmax,
383 .extra1 = &one,
384 },
385 #endif
386 #ifdef CONFIG_PROVE_LOCKING
387 {
388 .procname = "prove_locking",
389 .data = &prove_locking,
390 .maxlen = sizeof(int),
391 .mode = 0644,
392 .proc_handler = proc_dointvec,
393 },
394 #endif
395 #ifdef CONFIG_LOCK_STAT
396 {
397 .procname = "lock_stat",
398 .data = &lock_stat,
399 .maxlen = sizeof(int),
400 .mode = 0644,
401 .proc_handler = proc_dointvec,
402 },
403 #endif
404 {
405 .procname = "panic",
406 .data = &panic_timeout,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = proc_dointvec,
410 },
411 #ifdef CONFIG_COREDUMP
412 {
413 .procname = "core_uses_pid",
414 .data = &core_uses_pid,
415 .maxlen = sizeof(int),
416 .mode = 0644,
417 .proc_handler = proc_dointvec,
418 },
419 {
420 .procname = "core_pattern",
421 .data = core_pattern,
422 .maxlen = CORENAME_MAX_SIZE,
423 .mode = 0644,
424 .proc_handler = proc_dostring_coredump,
425 },
426 {
427 .procname = "core_pipe_limit",
428 .data = &core_pipe_limit,
429 .maxlen = sizeof(unsigned int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec,
432 },
433 #endif
434 #ifdef CONFIG_PROC_SYSCTL
435 {
436 .procname = "tainted",
437 .maxlen = sizeof(long),
438 .mode = 0644,
439 .proc_handler = proc_taint,
440 },
441 #endif
442 #ifdef CONFIG_LATENCYTOP
443 {
444 .procname = "latencytop",
445 .data = &latencytop_enabled,
446 .maxlen = sizeof(int),
447 .mode = 0644,
448 .proc_handler = proc_dointvec,
449 },
450 #endif
451 #ifdef CONFIG_BLK_DEV_INITRD
452 {
453 .procname = "real-root-dev",
454 .data = &real_root_dev,
455 .maxlen = sizeof(int),
456 .mode = 0644,
457 .proc_handler = proc_dointvec,
458 },
459 #endif
460 {
461 .procname = "print-fatal-signals",
462 .data = &print_fatal_signals,
463 .maxlen = sizeof(int),
464 .mode = 0644,
465 .proc_handler = proc_dointvec,
466 },
467 #ifdef CONFIG_SPARC
468 {
469 .procname = "reboot-cmd",
470 .data = reboot_command,
471 .maxlen = 256,
472 .mode = 0644,
473 .proc_handler = proc_dostring,
474 },
475 {
476 .procname = "stop-a",
477 .data = &stop_a_enabled,
478 .maxlen = sizeof (int),
479 .mode = 0644,
480 .proc_handler = proc_dointvec,
481 },
482 {
483 .procname = "scons-poweroff",
484 .data = &scons_pwroff,
485 .maxlen = sizeof (int),
486 .mode = 0644,
487 .proc_handler = proc_dointvec,
488 },
489 #endif
490 #ifdef CONFIG_SPARC64
491 {
492 .procname = "tsb-ratio",
493 .data = &sysctl_tsb_ratio,
494 .maxlen = sizeof (int),
495 .mode = 0644,
496 .proc_handler = proc_dointvec,
497 },
498 #endif
499 #ifdef __hppa__
500 {
501 .procname = "soft-power",
502 .data = &pwrsw_enabled,
503 .maxlen = sizeof (int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507 {
508 .procname = "unaligned-trap",
509 .data = &unaligned_enabled,
510 .maxlen = sizeof (int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec,
513 },
514 #endif
515 {
516 .procname = "ctrl-alt-del",
517 .data = &C_A_D,
518 .maxlen = sizeof(int),
519 .mode = 0644,
520 .proc_handler = proc_dointvec,
521 },
522 #ifdef CONFIG_FUNCTION_TRACER
523 {
524 .procname = "ftrace_enabled",
525 .data = &ftrace_enabled,
526 .maxlen = sizeof(int),
527 .mode = 0644,
528 .proc_handler = ftrace_enable_sysctl,
529 },
530 #endif
531 #ifdef CONFIG_STACK_TRACER
532 {
533 .procname = "stack_tracer_enabled",
534 .data = &stack_tracer_enabled,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = stack_trace_sysctl,
538 },
539 #endif
540 #ifdef CONFIG_TRACING
541 {
542 .procname = "ftrace_dump_on_oops",
543 .data = &ftrace_dump_on_oops,
544 .maxlen = sizeof(int),
545 .mode = 0644,
546 .proc_handler = proc_dointvec,
547 },
548 #endif
549 #ifdef CONFIG_MODULES
550 {
551 .procname = "modprobe",
552 .data = &modprobe_path,
553 .maxlen = KMOD_PATH_LEN,
554 .mode = 0644,
555 .proc_handler = proc_dostring,
556 },
557 {
558 .procname = "modules_disabled",
559 .data = &modules_disabled,
560 .maxlen = sizeof(int),
561 .mode = 0644,
562 /* only handle a transition from default "0" to "1" */
563 .proc_handler = proc_dointvec_minmax,
564 .extra1 = &one,
565 .extra2 = &one,
566 },
567 #endif
568 #ifdef CONFIG_HOTPLUG
569 {
570 .procname = "hotplug",
571 .data = &uevent_helper,
572 .maxlen = UEVENT_HELPER_PATH_LEN,
573 .mode = 0644,
574 .proc_handler = proc_dostring,
575 },
576 #endif
577 #ifdef CONFIG_CHR_DEV_SG
578 {
579 .procname = "sg-big-buff",
580 .data = &sg_big_buff,
581 .maxlen = sizeof (int),
582 .mode = 0444,
583 .proc_handler = proc_dointvec,
584 },
585 #endif
586 #ifdef CONFIG_BSD_PROCESS_ACCT
587 {
588 .procname = "acct",
589 .data = &acct_parm,
590 .maxlen = 3*sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec,
593 },
594 #endif
595 #ifdef CONFIG_MAGIC_SYSRQ
596 {
597 .procname = "sysrq",
598 .data = &__sysrq_enabled,
599 .maxlen = sizeof (int),
600 .mode = 0644,
601 .proc_handler = sysrq_sysctl_handler,
602 },
603 #endif
604 #ifdef CONFIG_PROC_SYSCTL
605 {
606 .procname = "cad_pid",
607 .data = NULL,
608 .maxlen = sizeof (int),
609 .mode = 0600,
610 .proc_handler = proc_do_cad_pid,
611 },
612 #endif
613 {
614 .procname = "threads-max",
615 .data = &max_threads,
616 .maxlen = sizeof(int),
617 .mode = 0644,
618 .proc_handler = proc_dointvec,
619 },
620 {
621 .procname = "random",
622 .mode = 0555,
623 .child = random_table,
624 },
625 {
626 .procname = "usermodehelper",
627 .mode = 0555,
628 .child = usermodehelper_table,
629 },
630 {
631 .procname = "overflowuid",
632 .data = &overflowuid,
633 .maxlen = sizeof(int),
634 .mode = 0644,
635 .proc_handler = proc_dointvec_minmax,
636 .extra1 = &minolduid,
637 .extra2 = &maxolduid,
638 },
639 {
640 .procname = "overflowgid",
641 .data = &overflowgid,
642 .maxlen = sizeof(int),
643 .mode = 0644,
644 .proc_handler = proc_dointvec_minmax,
645 .extra1 = &minolduid,
646 .extra2 = &maxolduid,
647 },
648 #ifdef CONFIG_S390
649 #ifdef CONFIG_MATHEMU
650 {
651 .procname = "ieee_emulation_warnings",
652 .data = &sysctl_ieee_emulation_warnings,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec,
656 },
657 #endif
658 {
659 .procname = "userprocess_debug",
660 .data = &show_unhandled_signals,
661 .maxlen = sizeof(int),
662 .mode = 0644,
663 .proc_handler = proc_dointvec,
664 },
665 #endif
666 {
667 .procname = "pid_max",
668 .data = &pid_max,
669 .maxlen = sizeof (int),
670 .mode = 0644,
671 .proc_handler = proc_dointvec_minmax,
672 .extra1 = &pid_max_min,
673 .extra2 = &pid_max_max,
674 },
675 {
676 .procname = "panic_on_oops",
677 .data = &panic_on_oops,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec,
681 },
682 #if defined CONFIG_PRINTK
683 {
684 .procname = "printk",
685 .data = &console_loglevel,
686 .maxlen = 4*sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec,
689 },
690 {
691 .procname = "printk_ratelimit",
692 .data = &printk_ratelimit_state.interval,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec_jiffies,
696 },
697 {
698 .procname = "printk_ratelimit_burst",
699 .data = &printk_ratelimit_state.burst,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 .proc_handler = proc_dointvec,
703 },
704 {
705 .procname = "printk_delay",
706 .data = &printk_delay_msec,
707 .maxlen = sizeof(int),
708 .mode = 0644,
709 .proc_handler = proc_dointvec_minmax,
710 .extra1 = &zero,
711 .extra2 = &ten_thousand,
712 },
713 {
714 .procname = "dmesg_restrict",
715 .data = &dmesg_restrict,
716 .maxlen = sizeof(int),
717 .mode = 0644,
718 .proc_handler = proc_dointvec_minmax_sysadmin,
719 .extra1 = &zero,
720 .extra2 = &one,
721 },
722 {
723 .procname = "kptr_restrict",
724 .data = &kptr_restrict,
725 .maxlen = sizeof(int),
726 .mode = 0644,
727 .proc_handler = proc_dointvec_minmax_sysadmin,
728 .extra1 = &zero,
729 .extra2 = &two,
730 },
731 #endif
732 {
733 .procname = "ngroups_max",
734 .data = &ngroups_max,
735 .maxlen = sizeof (int),
736 .mode = 0444,
737 .proc_handler = proc_dointvec,
738 },
739 {
740 .procname = "cap_last_cap",
741 .data = (void *)&cap_last_cap,
742 .maxlen = sizeof(int),
743 .mode = 0444,
744 .proc_handler = proc_dointvec,
745 },
746 #if defined(CONFIG_LOCKUP_DETECTOR)
747 {
748 .procname = "watchdog",
749 .data = &watchdog_enabled,
750 .maxlen = sizeof (int),
751 .mode = 0644,
752 .proc_handler = proc_dowatchdog,
753 .extra1 = &zero,
754 .extra2 = &one,
755 },
756 {
757 .procname = "watchdog_thresh",
758 .data = &watchdog_thresh,
759 .maxlen = sizeof(int),
760 .mode = 0644,
761 .proc_handler = proc_dowatchdog,
762 .extra1 = &neg_one,
763 .extra2 = &sixty,
764 },
765 {
766 .procname = "softlockup_panic",
767 .data = &softlockup_panic,
768 .maxlen = sizeof(int),
769 .mode = 0644,
770 .proc_handler = proc_dointvec_minmax,
771 .extra1 = &zero,
772 .extra2 = &one,
773 },
774 {
775 .procname = "nmi_watchdog",
776 .data = &watchdog_enabled,
777 .maxlen = sizeof (int),
778 .mode = 0644,
779 .proc_handler = proc_dowatchdog,
780 .extra1 = &zero,
781 .extra2 = &one,
782 },
783 #endif
784 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
785 {
786 .procname = "unknown_nmi_panic",
787 .data = &unknown_nmi_panic,
788 .maxlen = sizeof (int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec,
791 },
792 #endif
793 #if defined(CONFIG_X86)
794 {
795 .procname = "panic_on_unrecovered_nmi",
796 .data = &panic_on_unrecovered_nmi,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec,
800 },
801 {
802 .procname = "panic_on_io_nmi",
803 .data = &panic_on_io_nmi,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec,
807 },
808 #ifdef CONFIG_DEBUG_STACKOVERFLOW
809 {
810 .procname = "panic_on_stackoverflow",
811 .data = &sysctl_panic_on_stackoverflow,
812 .maxlen = sizeof(int),
813 .mode = 0644,
814 .proc_handler = proc_dointvec,
815 },
816 #endif
817 {
818 .procname = "bootloader_type",
819 .data = &bootloader_type,
820 .maxlen = sizeof (int),
821 .mode = 0444,
822 .proc_handler = proc_dointvec,
823 },
824 {
825 .procname = "bootloader_version",
826 .data = &bootloader_version,
827 .maxlen = sizeof (int),
828 .mode = 0444,
829 .proc_handler = proc_dointvec,
830 },
831 {
832 .procname = "kstack_depth_to_print",
833 .data = &kstack_depth_to_print,
834 .maxlen = sizeof(int),
835 .mode = 0644,
836 .proc_handler = proc_dointvec,
837 },
838 {
839 .procname = "io_delay_type",
840 .data = &io_delay_type,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = proc_dointvec,
844 },
845 #endif
846 #if defined(CONFIG_MMU)
847 {
848 .procname = "randomize_va_space",
849 .data = &randomize_va_space,
850 .maxlen = sizeof(int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec,
853 },
854 #endif
855 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
856 {
857 .procname = "spin_retry",
858 .data = &spin_retry,
859 .maxlen = sizeof (int),
860 .mode = 0644,
861 .proc_handler = proc_dointvec,
862 },
863 #endif
864 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
865 {
866 .procname = "acpi_video_flags",
867 .data = &acpi_realmode_flags,
868 .maxlen = sizeof (unsigned long),
869 .mode = 0644,
870 .proc_handler = proc_doulongvec_minmax,
871 },
872 #endif
873 #ifdef CONFIG_IA64
874 {
875 .procname = "ignore-unaligned-usertrap",
876 .data = &no_unaligned_warning,
877 .maxlen = sizeof (int),
878 .mode = 0644,
879 .proc_handler = proc_dointvec,
880 },
881 {
882 .procname = "unaligned-dump-stack",
883 .data = &unaligned_dump_stack,
884 .maxlen = sizeof (int),
885 .mode = 0644,
886 .proc_handler = proc_dointvec,
887 },
888 #endif
889 #ifdef CONFIG_DETECT_HUNG_TASK
890 {
891 .procname = "hung_task_panic",
892 .data = &sysctl_hung_task_panic,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_dointvec_minmax,
896 .extra1 = &zero,
897 .extra2 = &one,
898 },
899 {
900 .procname = "hung_task_check_count",
901 .data = &sysctl_hung_task_check_count,
902 .maxlen = sizeof(unsigned long),
903 .mode = 0644,
904 .proc_handler = proc_doulongvec_minmax,
905 },
906 {
907 .procname = "hung_task_timeout_secs",
908 .data = &sysctl_hung_task_timeout_secs,
909 .maxlen = sizeof(unsigned long),
910 .mode = 0644,
911 .proc_handler = proc_dohung_task_timeout_secs,
912 },
913 {
914 .procname = "hung_task_warnings",
915 .data = &sysctl_hung_task_warnings,
916 .maxlen = sizeof(unsigned long),
917 .mode = 0644,
918 .proc_handler = proc_doulongvec_minmax,
919 },
920 #endif
921 #ifdef CONFIG_COMPAT
922 {
923 .procname = "compat-log",
924 .data = &compat_log,
925 .maxlen = sizeof (int),
926 .mode = 0644,
927 .proc_handler = proc_dointvec,
928 },
929 #endif
930 #ifdef CONFIG_RT_MUTEXES
931 {
932 .procname = "max_lock_depth",
933 .data = &max_lock_depth,
934 .maxlen = sizeof(int),
935 .mode = 0644,
936 .proc_handler = proc_dointvec,
937 },
938 #endif
939 {
940 .procname = "poweroff_cmd",
941 .data = &poweroff_cmd,
942 .maxlen = POWEROFF_CMD_PATH_LEN,
943 .mode = 0644,
944 .proc_handler = proc_dostring,
945 },
946 #ifdef CONFIG_KEYS
947 {
948 .procname = "keys",
949 .mode = 0555,
950 .child = key_sysctls,
951 },
952 #endif
953 #ifdef CONFIG_RCU_TORTURE_TEST
954 {
955 .procname = "rcutorture_runnable",
956 .data = &rcutorture_runnable,
957 .maxlen = sizeof(int),
958 .mode = 0644,
959 .proc_handler = proc_dointvec,
960 },
961 #endif
962 #ifdef CONFIG_PERF_EVENTS
963 /*
964 * User-space scripts rely on the existence of this file
965 * as a feature check for perf_events being enabled.
966 *
967 * So it's an ABI, do not remove!
968 */
969 {
970 .procname = "perf_event_paranoid",
971 .data = &sysctl_perf_event_paranoid,
972 .maxlen = sizeof(sysctl_perf_event_paranoid),
973 .mode = 0644,
974 .proc_handler = proc_dointvec,
975 },
976 {
977 .procname = "perf_event_mlock_kb",
978 .data = &sysctl_perf_event_mlock,
979 .maxlen = sizeof(sysctl_perf_event_mlock),
980 .mode = 0644,
981 .proc_handler = proc_dointvec,
982 },
983 {
984 .procname = "perf_event_max_sample_rate",
985 .data = &sysctl_perf_event_sample_rate,
986 .maxlen = sizeof(sysctl_perf_event_sample_rate),
987 .mode = 0644,
988 .proc_handler = perf_proc_update_handler,
989 },
990 #endif
991 #ifdef CONFIG_KMEMCHECK
992 {
993 .procname = "kmemcheck",
994 .data = &kmemcheck_enabled,
995 .maxlen = sizeof(int),
996 .mode = 0644,
997 .proc_handler = proc_dointvec,
998 },
999 #endif
1000 #ifdef CONFIG_BLOCK
1001 {
1002 .procname = "blk_iopoll",
1003 .data = &blk_iopoll_enabled,
1004 .maxlen = sizeof(int),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec,
1007 },
1008 #endif
1009 { }
1010 };
1011
1012 static struct ctl_table vm_table[] = {
1013 {
1014 .procname = "overcommit_memory",
1015 .data = &sysctl_overcommit_memory,
1016 .maxlen = sizeof(sysctl_overcommit_memory),
1017 .mode = 0644,
1018 .proc_handler = proc_dointvec_minmax,
1019 .extra1 = &zero,
1020 .extra2 = &two,
1021 },
1022 {
1023 .procname = "panic_on_oom",
1024 .data = &sysctl_panic_on_oom,
1025 .maxlen = sizeof(sysctl_panic_on_oom),
1026 .mode = 0644,
1027 .proc_handler = proc_dointvec_minmax,
1028 .extra1 = &zero,
1029 .extra2 = &two,
1030 },
1031 {
1032 .procname = "oom_kill_allocating_task",
1033 .data = &sysctl_oom_kill_allocating_task,
1034 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1035 .mode = 0644,
1036 .proc_handler = proc_dointvec,
1037 },
1038 {
1039 .procname = "oom_dump_tasks",
1040 .data = &sysctl_oom_dump_tasks,
1041 .maxlen = sizeof(sysctl_oom_dump_tasks),
1042 .mode = 0644,
1043 .proc_handler = proc_dointvec,
1044 },
1045 {
1046 .procname = "overcommit_ratio",
1047 .data = &sysctl_overcommit_ratio,
1048 .maxlen = sizeof(sysctl_overcommit_ratio),
1049 .mode = 0644,
1050 .proc_handler = proc_dointvec,
1051 },
1052 {
1053 .procname = "page-cluster",
1054 .data = &page_cluster,
1055 .maxlen = sizeof(int),
1056 .mode = 0644,
1057 .proc_handler = proc_dointvec_minmax,
1058 .extra1 = &zero,
1059 },
1060 {
1061 .procname = "dirty_background_ratio",
1062 .data = &dirty_background_ratio,
1063 .maxlen = sizeof(dirty_background_ratio),
1064 .mode = 0644,
1065 .proc_handler = dirty_background_ratio_handler,
1066 .extra1 = &zero,
1067 .extra2 = &one_hundred,
1068 },
1069 {
1070 .procname = "dirty_background_bytes",
1071 .data = &dirty_background_bytes,
1072 .maxlen = sizeof(dirty_background_bytes),
1073 .mode = 0644,
1074 .proc_handler = dirty_background_bytes_handler,
1075 .extra1 = &one_ul,
1076 },
1077 {
1078 .procname = "dirty_ratio",
1079 .data = &vm_dirty_ratio,
1080 .maxlen = sizeof(vm_dirty_ratio),
1081 .mode = 0644,
1082 .proc_handler = dirty_ratio_handler,
1083 .extra1 = &zero,
1084 .extra2 = &one_hundred,
1085 },
1086 {
1087 .procname = "dirty_bytes",
1088 .data = &vm_dirty_bytes,
1089 .maxlen = sizeof(vm_dirty_bytes),
1090 .mode = 0644,
1091 .proc_handler = dirty_bytes_handler,
1092 .extra1 = &dirty_bytes_min,
1093 },
1094 {
1095 .procname = "dirty_writeback_centisecs",
1096 .data = &dirty_writeback_interval,
1097 .maxlen = sizeof(dirty_writeback_interval),
1098 .mode = 0644,
1099 .proc_handler = dirty_writeback_centisecs_handler,
1100 },
1101 {
1102 .procname = "dirty_expire_centisecs",
1103 .data = &dirty_expire_interval,
1104 .maxlen = sizeof(dirty_expire_interval),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec_minmax,
1107 .extra1 = &zero,
1108 },
1109 {
1110 .procname = "nr_pdflush_threads",
1111 .mode = 0444 /* read-only */,
1112 .proc_handler = pdflush_proc_obsolete,
1113 },
1114 {
1115 .procname = "swappiness",
1116 .data = &vm_swappiness,
1117 .maxlen = sizeof(vm_swappiness),
1118 .mode = 0644,
1119 .proc_handler = proc_dointvec_minmax,
1120 .extra1 = &zero,
1121 .extra2 = &one_hundred,
1122 },
1123 #ifdef CONFIG_HUGETLB_PAGE
1124 {
1125 .procname = "nr_hugepages",
1126 .data = NULL,
1127 .maxlen = sizeof(unsigned long),
1128 .mode = 0644,
1129 .proc_handler = hugetlb_sysctl_handler,
1130 .extra1 = (void *)&hugetlb_zero,
1131 .extra2 = (void *)&hugetlb_infinity,
1132 },
1133 #ifdef CONFIG_NUMA
1134 {
1135 .procname = "nr_hugepages_mempolicy",
1136 .data = NULL,
1137 .maxlen = sizeof(unsigned long),
1138 .mode = 0644,
1139 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1140 .extra1 = (void *)&hugetlb_zero,
1141 .extra2 = (void *)&hugetlb_infinity,
1142 },
1143 #endif
1144 {
1145 .procname = "hugetlb_shm_group",
1146 .data = &sysctl_hugetlb_shm_group,
1147 .maxlen = sizeof(gid_t),
1148 .mode = 0644,
1149 .proc_handler = proc_dointvec,
1150 },
1151 {
1152 .procname = "hugepages_treat_as_movable",
1153 .data = &hugepages_treat_as_movable,
1154 .maxlen = sizeof(int),
1155 .mode = 0644,
1156 .proc_handler = hugetlb_treat_movable_handler,
1157 },
1158 {
1159 .procname = "nr_overcommit_hugepages",
1160 .data = NULL,
1161 .maxlen = sizeof(unsigned long),
1162 .mode = 0644,
1163 .proc_handler = hugetlb_overcommit_handler,
1164 .extra1 = (void *)&hugetlb_zero,
1165 .extra2 = (void *)&hugetlb_infinity,
1166 },
1167 #endif
1168 {
1169 .procname = "lowmem_reserve_ratio",
1170 .data = &sysctl_lowmem_reserve_ratio,
1171 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1172 .mode = 0644,
1173 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1174 },
1175 {
1176 .procname = "drop_caches",
1177 .data = &sysctl_drop_caches,
1178 .maxlen = sizeof(int),
1179 .mode = 0644,
1180 .proc_handler = drop_caches_sysctl_handler,
1181 .extra1 = &one,
1182 .extra2 = &three,
1183 },
1184 #ifdef CONFIG_COMPACTION
1185 {
1186 .procname = "compact_memory",
1187 .data = &sysctl_compact_memory,
1188 .maxlen = sizeof(int),
1189 .mode = 0200,
1190 .proc_handler = sysctl_compaction_handler,
1191 },
1192 {
1193 .procname = "extfrag_threshold",
1194 .data = &sysctl_extfrag_threshold,
1195 .maxlen = sizeof(int),
1196 .mode = 0644,
1197 .proc_handler = sysctl_extfrag_handler,
1198 .extra1 = &min_extfrag_threshold,
1199 .extra2 = &max_extfrag_threshold,
1200 },
1201
1202 #endif /* CONFIG_COMPACTION */
1203 {
1204 .procname = "min_free_kbytes",
1205 .data = &min_free_kbytes,
1206 .maxlen = sizeof(min_free_kbytes),
1207 .mode = 0644,
1208 .proc_handler = min_free_kbytes_sysctl_handler,
1209 .extra1 = &zero,
1210 },
1211 {
1212 .procname = "percpu_pagelist_fraction",
1213 .data = &percpu_pagelist_fraction,
1214 .maxlen = sizeof(percpu_pagelist_fraction),
1215 .mode = 0644,
1216 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1217 .extra1 = &min_percpu_pagelist_fract,
1218 },
1219 #ifdef CONFIG_MMU
1220 {
1221 .procname = "max_map_count",
1222 .data = &sysctl_max_map_count,
1223 .maxlen = sizeof(sysctl_max_map_count),
1224 .mode = 0644,
1225 .proc_handler = proc_dointvec_minmax,
1226 .extra1 = &zero,
1227 },
1228 #else
1229 {
1230 .procname = "nr_trim_pages",
1231 .data = &sysctl_nr_trim_pages,
1232 .maxlen = sizeof(sysctl_nr_trim_pages),
1233 .mode = 0644,
1234 .proc_handler = proc_dointvec_minmax,
1235 .extra1 = &zero,
1236 },
1237 #endif
1238 {
1239 .procname = "laptop_mode",
1240 .data = &laptop_mode,
1241 .maxlen = sizeof(laptop_mode),
1242 .mode = 0644,
1243 .proc_handler = proc_dointvec_jiffies,
1244 },
1245 {
1246 .procname = "block_dump",
1247 .data = &block_dump,
1248 .maxlen = sizeof(block_dump),
1249 .mode = 0644,
1250 .proc_handler = proc_dointvec,
1251 .extra1 = &zero,
1252 },
1253 {
1254 .procname = "vfs_cache_pressure",
1255 .data = &sysctl_vfs_cache_pressure,
1256 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1257 .mode = 0644,
1258 .proc_handler = proc_dointvec,
1259 .extra1 = &zero,
1260 },
1261 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1262 {
1263 .procname = "legacy_va_layout",
1264 .data = &sysctl_legacy_va_layout,
1265 .maxlen = sizeof(sysctl_legacy_va_layout),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec,
1268 .extra1 = &zero,
1269 },
1270 #endif
1271 #ifdef CONFIG_NUMA
1272 {
1273 .procname = "zone_reclaim_mode",
1274 .data = &zone_reclaim_mode,
1275 .maxlen = sizeof(zone_reclaim_mode),
1276 .mode = 0644,
1277 .proc_handler = proc_dointvec,
1278 .extra1 = &zero,
1279 },
1280 {
1281 .procname = "min_unmapped_ratio",
1282 .data = &sysctl_min_unmapped_ratio,
1283 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1284 .mode = 0644,
1285 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1286 .extra1 = &zero,
1287 .extra2 = &one_hundred,
1288 },
1289 {
1290 .procname = "min_slab_ratio",
1291 .data = &sysctl_min_slab_ratio,
1292 .maxlen = sizeof(sysctl_min_slab_ratio),
1293 .mode = 0644,
1294 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1295 .extra1 = &zero,
1296 .extra2 = &one_hundred,
1297 },
1298 #endif
1299 #ifdef CONFIG_SMP
1300 {
1301 .procname = "stat_interval",
1302 .data = &sysctl_stat_interval,
1303 .maxlen = sizeof(sysctl_stat_interval),
1304 .mode = 0644,
1305 .proc_handler = proc_dointvec_jiffies,
1306 },
1307 #endif
1308 #ifdef CONFIG_MMU
1309 {
1310 .procname = "mmap_min_addr",
1311 .data = &dac_mmap_min_addr,
1312 .maxlen = sizeof(unsigned long),
1313 .mode = 0644,
1314 .proc_handler = mmap_min_addr_handler,
1315 },
1316 #endif
1317 #ifdef CONFIG_NUMA
1318 {
1319 .procname = "numa_zonelist_order",
1320 .data = &numa_zonelist_order,
1321 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1322 .mode = 0644,
1323 .proc_handler = numa_zonelist_order_handler,
1324 },
1325 #endif
1326 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1327 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1328 {
1329 .procname = "vdso_enabled",
1330 .data = &vdso_enabled,
1331 .maxlen = sizeof(vdso_enabled),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec,
1334 .extra1 = &zero,
1335 },
1336 #endif
1337 #ifdef CONFIG_HIGHMEM
1338 {
1339 .procname = "highmem_is_dirtyable",
1340 .data = &vm_highmem_is_dirtyable,
1341 .maxlen = sizeof(vm_highmem_is_dirtyable),
1342 .mode = 0644,
1343 .proc_handler = proc_dointvec_minmax,
1344 .extra1 = &zero,
1345 .extra2 = &one,
1346 },
1347 #endif
1348 {
1349 .procname = "scan_unevictable_pages",
1350 .data = &scan_unevictable_pages,
1351 .maxlen = sizeof(scan_unevictable_pages),
1352 .mode = 0644,
1353 .proc_handler = scan_unevictable_handler,
1354 },
1355 #ifdef CONFIG_MEMORY_FAILURE
1356 {
1357 .procname = "memory_failure_early_kill",
1358 .data = &sysctl_memory_failure_early_kill,
1359 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1360 .mode = 0644,
1361 .proc_handler = proc_dointvec_minmax,
1362 .extra1 = &zero,
1363 .extra2 = &one,
1364 },
1365 {
1366 .procname = "memory_failure_recovery",
1367 .data = &sysctl_memory_failure_recovery,
1368 .maxlen = sizeof(sysctl_memory_failure_recovery),
1369 .mode = 0644,
1370 .proc_handler = proc_dointvec_minmax,
1371 .extra1 = &zero,
1372 .extra2 = &one,
1373 },
1374 #endif
1375 { }
1376 };
1377
1378 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1379 static struct ctl_table binfmt_misc_table[] = {
1380 { }
1381 };
1382 #endif
1383
1384 static struct ctl_table fs_table[] = {
1385 {
1386 .procname = "inode-nr",
1387 .data = &inodes_stat,
1388 .maxlen = 2*sizeof(int),
1389 .mode = 0444,
1390 .proc_handler = proc_nr_inodes,
1391 },
1392 {
1393 .procname = "inode-state",
1394 .data = &inodes_stat,
1395 .maxlen = 7*sizeof(int),
1396 .mode = 0444,
1397 .proc_handler = proc_nr_inodes,
1398 },
1399 {
1400 .procname = "file-nr",
1401 .data = &files_stat,
1402 .maxlen = sizeof(files_stat),
1403 .mode = 0444,
1404 .proc_handler = proc_nr_files,
1405 },
1406 {
1407 .procname = "file-max",
1408 .data = &files_stat.max_files,
1409 .maxlen = sizeof(files_stat.max_files),
1410 .mode = 0644,
1411 .proc_handler = proc_doulongvec_minmax,
1412 },
1413 {
1414 .procname = "nr_open",
1415 .data = &sysctl_nr_open,
1416 .maxlen = sizeof(int),
1417 .mode = 0644,
1418 .proc_handler = proc_dointvec_minmax,
1419 .extra1 = &sysctl_nr_open_min,
1420 .extra2 = &sysctl_nr_open_max,
1421 },
1422 {
1423 .procname = "dentry-state",
1424 .data = &dentry_stat,
1425 .maxlen = 6*sizeof(int),
1426 .mode = 0444,
1427 .proc_handler = proc_nr_dentry,
1428 },
1429 {
1430 .procname = "overflowuid",
1431 .data = &fs_overflowuid,
1432 .maxlen = sizeof(int),
1433 .mode = 0644,
1434 .proc_handler = proc_dointvec_minmax,
1435 .extra1 = &minolduid,
1436 .extra2 = &maxolduid,
1437 },
1438 {
1439 .procname = "overflowgid",
1440 .data = &fs_overflowgid,
1441 .maxlen = sizeof(int),
1442 .mode = 0644,
1443 .proc_handler = proc_dointvec_minmax,
1444 .extra1 = &minolduid,
1445 .extra2 = &maxolduid,
1446 },
1447 #ifdef CONFIG_FILE_LOCKING
1448 {
1449 .procname = "leases-enable",
1450 .data = &leases_enable,
1451 .maxlen = sizeof(int),
1452 .mode = 0644,
1453 .proc_handler = proc_dointvec,
1454 },
1455 #endif
1456 #ifdef CONFIG_DNOTIFY
1457 {
1458 .procname = "dir-notify-enable",
1459 .data = &dir_notify_enable,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec,
1463 },
1464 #endif
1465 #ifdef CONFIG_MMU
1466 #ifdef CONFIG_FILE_LOCKING
1467 {
1468 .procname = "lease-break-time",
1469 .data = &lease_break_time,
1470 .maxlen = sizeof(int),
1471 .mode = 0644,
1472 .proc_handler = proc_dointvec,
1473 },
1474 #endif
1475 #ifdef CONFIG_AIO
1476 {
1477 .procname = "aio-nr",
1478 .data = &aio_nr,
1479 .maxlen = sizeof(aio_nr),
1480 .mode = 0444,
1481 .proc_handler = proc_doulongvec_minmax,
1482 },
1483 {
1484 .procname = "aio-max-nr",
1485 .data = &aio_max_nr,
1486 .maxlen = sizeof(aio_max_nr),
1487 .mode = 0644,
1488 .proc_handler = proc_doulongvec_minmax,
1489 },
1490 #endif /* CONFIG_AIO */
1491 #ifdef CONFIG_INOTIFY_USER
1492 {
1493 .procname = "inotify",
1494 .mode = 0555,
1495 .child = inotify_table,
1496 },
1497 #endif
1498 #ifdef CONFIG_EPOLL
1499 {
1500 .procname = "epoll",
1501 .mode = 0555,
1502 .child = epoll_table,
1503 },
1504 #endif
1505 #endif
1506 {
1507 .procname = "protected_symlinks",
1508 .data = &sysctl_protected_symlinks,
1509 .maxlen = sizeof(int),
1510 .mode = 0600,
1511 .proc_handler = proc_dointvec_minmax,
1512 .extra1 = &zero,
1513 .extra2 = &one,
1514 },
1515 {
1516 .procname = "protected_hardlinks",
1517 .data = &sysctl_protected_hardlinks,
1518 .maxlen = sizeof(int),
1519 .mode = 0600,
1520 .proc_handler = proc_dointvec_minmax,
1521 .extra1 = &zero,
1522 .extra2 = &one,
1523 },
1524 {
1525 .procname = "suid_dumpable",
1526 .data = &suid_dumpable,
1527 .maxlen = sizeof(int),
1528 .mode = 0644,
1529 .proc_handler = proc_dointvec_minmax_coredump,
1530 .extra1 = &zero,
1531 .extra2 = &two,
1532 },
1533 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1534 {
1535 .procname = "binfmt_misc",
1536 .mode = 0555,
1537 .child = binfmt_misc_table,
1538 },
1539 #endif
1540 {
1541 .procname = "pipe-max-size",
1542 .data = &pipe_max_size,
1543 .maxlen = sizeof(int),
1544 .mode = 0644,
1545 .proc_handler = &pipe_proc_fn,
1546 .extra1 = &pipe_min_size,
1547 },
1548 { }
1549 };
1550
1551 static struct ctl_table debug_table[] = {
1552 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1553 {
1554 .procname = "exception-trace",
1555 .data = &show_unhandled_signals,
1556 .maxlen = sizeof(int),
1557 .mode = 0644,
1558 .proc_handler = proc_dointvec
1559 },
1560 #endif
1561 #if defined(CONFIG_OPTPROBES)
1562 {
1563 .procname = "kprobes-optimization",
1564 .data = &sysctl_kprobes_optimization,
1565 .maxlen = sizeof(int),
1566 .mode = 0644,
1567 .proc_handler = proc_kprobes_optimization_handler,
1568 .extra1 = &zero,
1569 .extra2 = &one,
1570 },
1571 #endif
1572 { }
1573 };
1574
1575 static struct ctl_table dev_table[] = {
1576 { }
1577 };
1578
1579 int __init sysctl_init(void)
1580 {
1581 struct ctl_table_header *hdr;
1582
1583 hdr = register_sysctl_table(sysctl_base_table);
1584 kmemleak_not_leak(hdr);
1585 return 0;
1586 }
1587
1588 #endif /* CONFIG_SYSCTL */
1589
1590 /*
1591 * /proc/sys support
1592 */
1593
1594 #ifdef CONFIG_PROC_SYSCTL
1595
1596 static int _proc_do_string(void* data, int maxlen, int write,
1597 void __user *buffer,
1598 size_t *lenp, loff_t *ppos)
1599 {
1600 size_t len;
1601 char __user *p;
1602 char c;
1603
1604 if (!data || !maxlen || !*lenp) {
1605 *lenp = 0;
1606 return 0;
1607 }
1608
1609 if (write) {
1610 len = 0;
1611 p = buffer;
1612 while (len < *lenp) {
1613 if (get_user(c, p++))
1614 return -EFAULT;
1615 if (c == 0 || c == '\n')
1616 break;
1617 len++;
1618 }
1619 if (len >= maxlen)
1620 len = maxlen-1;
1621 if(copy_from_user(data, buffer, len))
1622 return -EFAULT;
1623 ((char *) data)[len] = 0;
1624 *ppos += *lenp;
1625 } else {
1626 len = strlen(data);
1627 if (len > maxlen)
1628 len = maxlen;
1629
1630 if (*ppos > len) {
1631 *lenp = 0;
1632 return 0;
1633 }
1634
1635 data += *ppos;
1636 len -= *ppos;
1637
1638 if (len > *lenp)
1639 len = *lenp;
1640 if (len)
1641 if(copy_to_user(buffer, data, len))
1642 return -EFAULT;
1643 if (len < *lenp) {
1644 if(put_user('\n', ((char __user *) buffer) + len))
1645 return -EFAULT;
1646 len++;
1647 }
1648 *lenp = len;
1649 *ppos += len;
1650 }
1651 return 0;
1652 }
1653
1654 /**
1655 * proc_dostring - read a string sysctl
1656 * @table: the sysctl table
1657 * @write: %TRUE if this is a write to the sysctl file
1658 * @buffer: the user buffer
1659 * @lenp: the size of the user buffer
1660 * @ppos: file position
1661 *
1662 * Reads/writes a string from/to the user buffer. If the kernel
1663 * buffer provided is not large enough to hold the string, the
1664 * string is truncated. The copied string is %NULL-terminated.
1665 * If the string is being read by the user process, it is copied
1666 * and a newline '\n' is added. It is truncated if the buffer is
1667 * not large enough.
1668 *
1669 * Returns 0 on success.
1670 */
1671 int proc_dostring(struct ctl_table *table, int write,
1672 void __user *buffer, size_t *lenp, loff_t *ppos)
1673 {
1674 return _proc_do_string(table->data, table->maxlen, write,
1675 buffer, lenp, ppos);
1676 }
1677
1678 static size_t proc_skip_spaces(char **buf)
1679 {
1680 size_t ret;
1681 char *tmp = skip_spaces(*buf);
1682 ret = tmp - *buf;
1683 *buf = tmp;
1684 return ret;
1685 }
1686
1687 static void proc_skip_char(char **buf, size_t *size, const char v)
1688 {
1689 while (*size) {
1690 if (**buf != v)
1691 break;
1692 (*size)--;
1693 (*buf)++;
1694 }
1695 }
1696
1697 #define TMPBUFLEN 22
1698 /**
1699 * proc_get_long - reads an ASCII formatted integer from a user buffer
1700 *
1701 * @buf: a kernel buffer
1702 * @size: size of the kernel buffer
1703 * @val: this is where the number will be stored
1704 * @neg: set to %TRUE if number is negative
1705 * @perm_tr: a vector which contains the allowed trailers
1706 * @perm_tr_len: size of the perm_tr vector
1707 * @tr: pointer to store the trailer character
1708 *
1709 * In case of success %0 is returned and @buf and @size are updated with
1710 * the amount of bytes read. If @tr is non-NULL and a trailing
1711 * character exists (size is non-zero after returning from this
1712 * function), @tr is updated with the trailing character.
1713 */
1714 static int proc_get_long(char **buf, size_t *size,
1715 unsigned long *val, bool *neg,
1716 const char *perm_tr, unsigned perm_tr_len, char *tr)
1717 {
1718 int len;
1719 char *p, tmp[TMPBUFLEN];
1720
1721 if (!*size)
1722 return -EINVAL;
1723
1724 len = *size;
1725 if (len > TMPBUFLEN - 1)
1726 len = TMPBUFLEN - 1;
1727
1728 memcpy(tmp, *buf, len);
1729
1730 tmp[len] = 0;
1731 p = tmp;
1732 if (*p == '-' && *size > 1) {
1733 *neg = true;
1734 p++;
1735 } else
1736 *neg = false;
1737 if (!isdigit(*p))
1738 return -EINVAL;
1739
1740 *val = simple_strtoul(p, &p, 0);
1741
1742 len = p - tmp;
1743
1744 /* We don't know if the next char is whitespace thus we may accept
1745 * invalid integers (e.g. 1234...a) or two integers instead of one
1746 * (e.g. 123...1). So lets not allow such large numbers. */
1747 if (len == TMPBUFLEN - 1)
1748 return -EINVAL;
1749
1750 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1751 return -EINVAL;
1752
1753 if (tr && (len < *size))
1754 *tr = *p;
1755
1756 *buf += len;
1757 *size -= len;
1758
1759 return 0;
1760 }
1761
1762 /**
1763 * proc_put_long - converts an integer to a decimal ASCII formatted string
1764 *
1765 * @buf: the user buffer
1766 * @size: the size of the user buffer
1767 * @val: the integer to be converted
1768 * @neg: sign of the number, %TRUE for negative
1769 *
1770 * In case of success %0 is returned and @buf and @size are updated with
1771 * the amount of bytes written.
1772 */
1773 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1774 bool neg)
1775 {
1776 int len;
1777 char tmp[TMPBUFLEN], *p = tmp;
1778
1779 sprintf(p, "%s%lu", neg ? "-" : "", val);
1780 len = strlen(tmp);
1781 if (len > *size)
1782 len = *size;
1783 if (copy_to_user(*buf, tmp, len))
1784 return -EFAULT;
1785 *size -= len;
1786 *buf += len;
1787 return 0;
1788 }
1789 #undef TMPBUFLEN
1790
1791 static int proc_put_char(void __user **buf, size_t *size, char c)
1792 {
1793 if (*size) {
1794 char __user **buffer = (char __user **)buf;
1795 if (put_user(c, *buffer))
1796 return -EFAULT;
1797 (*size)--, (*buffer)++;
1798 *buf = *buffer;
1799 }
1800 return 0;
1801 }
1802
1803 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1804 int *valp,
1805 int write, void *data)
1806 {
1807 if (write) {
1808 *valp = *negp ? -*lvalp : *lvalp;
1809 } else {
1810 int val = *valp;
1811 if (val < 0) {
1812 *negp = true;
1813 *lvalp = (unsigned long)-val;
1814 } else {
1815 *negp = false;
1816 *lvalp = (unsigned long)val;
1817 }
1818 }
1819 return 0;
1820 }
1821
1822 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1823
1824 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1825 int write, void __user *buffer,
1826 size_t *lenp, loff_t *ppos,
1827 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1828 int write, void *data),
1829 void *data)
1830 {
1831 int *i, vleft, first = 1, err = 0;
1832 unsigned long page = 0;
1833 size_t left;
1834 char *kbuf;
1835
1836 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1837 *lenp = 0;
1838 return 0;
1839 }
1840
1841 i = (int *) tbl_data;
1842 vleft = table->maxlen / sizeof(*i);
1843 left = *lenp;
1844
1845 if (!conv)
1846 conv = do_proc_dointvec_conv;
1847
1848 if (write) {
1849 if (left > PAGE_SIZE - 1)
1850 left = PAGE_SIZE - 1;
1851 page = __get_free_page(GFP_TEMPORARY);
1852 kbuf = (char *) page;
1853 if (!kbuf)
1854 return -ENOMEM;
1855 if (copy_from_user(kbuf, buffer, left)) {
1856 err = -EFAULT;
1857 goto free;
1858 }
1859 kbuf[left] = 0;
1860 }
1861
1862 for (; left && vleft--; i++, first=0) {
1863 unsigned long lval;
1864 bool neg;
1865
1866 if (write) {
1867 left -= proc_skip_spaces(&kbuf);
1868
1869 if (!left)
1870 break;
1871 err = proc_get_long(&kbuf, &left, &lval, &neg,
1872 proc_wspace_sep,
1873 sizeof(proc_wspace_sep), NULL);
1874 if (err)
1875 break;
1876 if (conv(&neg, &lval, i, 1, data)) {
1877 err = -EINVAL;
1878 break;
1879 }
1880 } else {
1881 if (conv(&neg, &lval, i, 0, data)) {
1882 err = -EINVAL;
1883 break;
1884 }
1885 if (!first)
1886 err = proc_put_char(&buffer, &left, '\t');
1887 if (err)
1888 break;
1889 err = proc_put_long(&buffer, &left, lval, neg);
1890 if (err)
1891 break;
1892 }
1893 }
1894
1895 if (!write && !first && left && !err)
1896 err = proc_put_char(&buffer, &left, '\n');
1897 if (write && !err && left)
1898 left -= proc_skip_spaces(&kbuf);
1899 free:
1900 if (write) {
1901 free_page(page);
1902 if (first)
1903 return err ? : -EINVAL;
1904 }
1905 *lenp -= left;
1906 *ppos += *lenp;
1907 return err;
1908 }
1909
1910 static int do_proc_dointvec(struct ctl_table *table, int write,
1911 void __user *buffer, size_t *lenp, loff_t *ppos,
1912 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1913 int write, void *data),
1914 void *data)
1915 {
1916 return __do_proc_dointvec(table->data, table, write,
1917 buffer, lenp, ppos, conv, data);
1918 }
1919
1920 /**
1921 * proc_dointvec - read a vector of integers
1922 * @table: the sysctl table
1923 * @write: %TRUE if this is a write to the sysctl file
1924 * @buffer: the user buffer
1925 * @lenp: the size of the user buffer
1926 * @ppos: file position
1927 *
1928 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1929 * values from/to the user buffer, treated as an ASCII string.
1930 *
1931 * Returns 0 on success.
1932 */
1933 int proc_dointvec(struct ctl_table *table, int write,
1934 void __user *buffer, size_t *lenp, loff_t *ppos)
1935 {
1936 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1937 NULL,NULL);
1938 }
1939
1940 /*
1941 * Taint values can only be increased
1942 * This means we can safely use a temporary.
1943 */
1944 static int proc_taint(struct ctl_table *table, int write,
1945 void __user *buffer, size_t *lenp, loff_t *ppos)
1946 {
1947 struct ctl_table t;
1948 unsigned long tmptaint = get_taint();
1949 int err;
1950
1951 if (write && !capable(CAP_SYS_ADMIN))
1952 return -EPERM;
1953
1954 t = *table;
1955 t.data = &tmptaint;
1956 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1957 if (err < 0)
1958 return err;
1959
1960 if (write) {
1961 /*
1962 * Poor man's atomic or. Not worth adding a primitive
1963 * to everyone's atomic.h for this
1964 */
1965 int i;
1966 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1967 if ((tmptaint >> i) & 1)
1968 add_taint(i);
1969 }
1970 }
1971
1972 return err;
1973 }
1974
1975 #ifdef CONFIG_PRINTK
1976 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1977 void __user *buffer, size_t *lenp, loff_t *ppos)
1978 {
1979 if (write && !capable(CAP_SYS_ADMIN))
1980 return -EPERM;
1981
1982 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1983 }
1984 #endif
1985
1986 struct do_proc_dointvec_minmax_conv_param {
1987 int *min;
1988 int *max;
1989 };
1990
1991 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1992 int *valp,
1993 int write, void *data)
1994 {
1995 struct do_proc_dointvec_minmax_conv_param *param = data;
1996 if (write) {
1997 int val = *negp ? -*lvalp : *lvalp;
1998 if ((param->min && *param->min > val) ||
1999 (param->max && *param->max < val))
2000 return -EINVAL;
2001 *valp = val;
2002 } else {
2003 int val = *valp;
2004 if (val < 0) {
2005 *negp = true;
2006 *lvalp = (unsigned long)-val;
2007 } else {
2008 *negp = false;
2009 *lvalp = (unsigned long)val;
2010 }
2011 }
2012 return 0;
2013 }
2014
2015 /**
2016 * proc_dointvec_minmax - read a vector of integers with min/max values
2017 * @table: the sysctl table
2018 * @write: %TRUE if this is a write to the sysctl file
2019 * @buffer: the user buffer
2020 * @lenp: the size of the user buffer
2021 * @ppos: file position
2022 *
2023 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2024 * values from/to the user buffer, treated as an ASCII string.
2025 *
2026 * This routine will ensure the values are within the range specified by
2027 * table->extra1 (min) and table->extra2 (max).
2028 *
2029 * Returns 0 on success.
2030 */
2031 int proc_dointvec_minmax(struct ctl_table *table, int write,
2032 void __user *buffer, size_t *lenp, loff_t *ppos)
2033 {
2034 struct do_proc_dointvec_minmax_conv_param param = {
2035 .min = (int *) table->extra1,
2036 .max = (int *) table->extra2,
2037 };
2038 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2039 do_proc_dointvec_minmax_conv, &param);
2040 }
2041
2042 static void validate_coredump_safety(void)
2043 {
2044 #ifdef CONFIG_COREDUMP
2045 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2046 core_pattern[0] != '/' && core_pattern[0] != '|') {
2047 printk(KERN_WARNING "Unsafe core_pattern used with "\
2048 "suid_dumpable=2. Pipe handler or fully qualified "\
2049 "core dump path required.\n");
2050 }
2051 #endif
2052 }
2053
2054 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2055 void __user *buffer, size_t *lenp, loff_t *ppos)
2056 {
2057 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2058 if (!error)
2059 validate_coredump_safety();
2060 return error;
2061 }
2062
2063 #ifdef CONFIG_COREDUMP
2064 static int proc_dostring_coredump(struct ctl_table *table, int write,
2065 void __user *buffer, size_t *lenp, loff_t *ppos)
2066 {
2067 int error = proc_dostring(table, write, buffer, lenp, ppos);
2068 if (!error)
2069 validate_coredump_safety();
2070 return error;
2071 }
2072 #endif
2073
2074 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2075 void __user *buffer,
2076 size_t *lenp, loff_t *ppos,
2077 unsigned long convmul,
2078 unsigned long convdiv)
2079 {
2080 unsigned long *i, *min, *max;
2081 int vleft, first = 1, err = 0;
2082 unsigned long page = 0;
2083 size_t left;
2084 char *kbuf;
2085
2086 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2087 *lenp = 0;
2088 return 0;
2089 }
2090
2091 i = (unsigned long *) data;
2092 min = (unsigned long *) table->extra1;
2093 max = (unsigned long *) table->extra2;
2094 vleft = table->maxlen / sizeof(unsigned long);
2095 left = *lenp;
2096
2097 if (write) {
2098 if (left > PAGE_SIZE - 1)
2099 left = PAGE_SIZE - 1;
2100 page = __get_free_page(GFP_TEMPORARY);
2101 kbuf = (char *) page;
2102 if (!kbuf)
2103 return -ENOMEM;
2104 if (copy_from_user(kbuf, buffer, left)) {
2105 err = -EFAULT;
2106 goto free;
2107 }
2108 kbuf[left] = 0;
2109 }
2110
2111 for (; left && vleft--; i++, first = 0) {
2112 unsigned long val;
2113
2114 if (write) {
2115 bool neg;
2116
2117 left -= proc_skip_spaces(&kbuf);
2118
2119 err = proc_get_long(&kbuf, &left, &val, &neg,
2120 proc_wspace_sep,
2121 sizeof(proc_wspace_sep), NULL);
2122 if (err)
2123 break;
2124 if (neg)
2125 continue;
2126 if ((min && val < *min) || (max && val > *max))
2127 continue;
2128 *i = val;
2129 } else {
2130 val = convdiv * (*i) / convmul;
2131 if (!first)
2132 err = proc_put_char(&buffer, &left, '\t');
2133 err = proc_put_long(&buffer, &left, val, false);
2134 if (err)
2135 break;
2136 }
2137 }
2138
2139 if (!write && !first && left && !err)
2140 err = proc_put_char(&buffer, &left, '\n');
2141 if (write && !err)
2142 left -= proc_skip_spaces(&kbuf);
2143 free:
2144 if (write) {
2145 free_page(page);
2146 if (first)
2147 return err ? : -EINVAL;
2148 }
2149 *lenp -= left;
2150 *ppos += *lenp;
2151 return err;
2152 }
2153
2154 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2155 void __user *buffer,
2156 size_t *lenp, loff_t *ppos,
2157 unsigned long convmul,
2158 unsigned long convdiv)
2159 {
2160 return __do_proc_doulongvec_minmax(table->data, table, write,
2161 buffer, lenp, ppos, convmul, convdiv);
2162 }
2163
2164 /**
2165 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2166 * @table: the sysctl table
2167 * @write: %TRUE if this is a write to the sysctl file
2168 * @buffer: the user buffer
2169 * @lenp: the size of the user buffer
2170 * @ppos: file position
2171 *
2172 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2173 * values from/to the user buffer, treated as an ASCII string.
2174 *
2175 * This routine will ensure the values are within the range specified by
2176 * table->extra1 (min) and table->extra2 (max).
2177 *
2178 * Returns 0 on success.
2179 */
2180 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2181 void __user *buffer, size_t *lenp, loff_t *ppos)
2182 {
2183 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2184 }
2185
2186 /**
2187 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2188 * @table: the sysctl table
2189 * @write: %TRUE if this is a write to the sysctl file
2190 * @buffer: the user buffer
2191 * @lenp: the size of the user buffer
2192 * @ppos: file position
2193 *
2194 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2195 * values from/to the user buffer, treated as an ASCII string. The values
2196 * are treated as milliseconds, and converted to jiffies when they are stored.
2197 *
2198 * This routine will ensure the values are within the range specified by
2199 * table->extra1 (min) and table->extra2 (max).
2200 *
2201 * Returns 0 on success.
2202 */
2203 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2204 void __user *buffer,
2205 size_t *lenp, loff_t *ppos)
2206 {
2207 return do_proc_doulongvec_minmax(table, write, buffer,
2208 lenp, ppos, HZ, 1000l);
2209 }
2210
2211
2212 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2213 int *valp,
2214 int write, void *data)
2215 {
2216 if (write) {
2217 if (*lvalp > LONG_MAX / HZ)
2218 return 1;
2219 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2220 } else {
2221 int val = *valp;
2222 unsigned long lval;
2223 if (val < 0) {
2224 *negp = true;
2225 lval = (unsigned long)-val;
2226 } else {
2227 *negp = false;
2228 lval = (unsigned long)val;
2229 }
2230 *lvalp = lval / HZ;
2231 }
2232 return 0;
2233 }
2234
2235 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2236 int *valp,
2237 int write, void *data)
2238 {
2239 if (write) {
2240 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2241 return 1;
2242 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2243 } else {
2244 int val = *valp;
2245 unsigned long lval;
2246 if (val < 0) {
2247 *negp = true;
2248 lval = (unsigned long)-val;
2249 } else {
2250 *negp = false;
2251 lval = (unsigned long)val;
2252 }
2253 *lvalp = jiffies_to_clock_t(lval);
2254 }
2255 return 0;
2256 }
2257
2258 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2259 int *valp,
2260 int write, void *data)
2261 {
2262 if (write) {
2263 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2264 } else {
2265 int val = *valp;
2266 unsigned long lval;
2267 if (val < 0) {
2268 *negp = true;
2269 lval = (unsigned long)-val;
2270 } else {
2271 *negp = false;
2272 lval = (unsigned long)val;
2273 }
2274 *lvalp = jiffies_to_msecs(lval);
2275 }
2276 return 0;
2277 }
2278
2279 /**
2280 * proc_dointvec_jiffies - read a vector of integers as seconds
2281 * @table: the sysctl table
2282 * @write: %TRUE if this is a write to the sysctl file
2283 * @buffer: the user buffer
2284 * @lenp: the size of the user buffer
2285 * @ppos: file position
2286 *
2287 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2288 * values from/to the user buffer, treated as an ASCII string.
2289 * The values read are assumed to be in seconds, and are converted into
2290 * jiffies.
2291 *
2292 * Returns 0 on success.
2293 */
2294 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2295 void __user *buffer, size_t *lenp, loff_t *ppos)
2296 {
2297 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2298 do_proc_dointvec_jiffies_conv,NULL);
2299 }
2300
2301 /**
2302 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2303 * @table: the sysctl table
2304 * @write: %TRUE if this is a write to the sysctl file
2305 * @buffer: the user buffer
2306 * @lenp: the size of the user buffer
2307 * @ppos: pointer to the file position
2308 *
2309 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2310 * values from/to the user buffer, treated as an ASCII string.
2311 * The values read are assumed to be in 1/USER_HZ seconds, and
2312 * are converted into jiffies.
2313 *
2314 * Returns 0 on success.
2315 */
2316 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2317 void __user *buffer, size_t *lenp, loff_t *ppos)
2318 {
2319 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2320 do_proc_dointvec_userhz_jiffies_conv,NULL);
2321 }
2322
2323 /**
2324 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2325 * @table: the sysctl table
2326 * @write: %TRUE if this is a write to the sysctl file
2327 * @buffer: the user buffer
2328 * @lenp: the size of the user buffer
2329 * @ppos: file position
2330 * @ppos: the current position in the file
2331 *
2332 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2333 * values from/to the user buffer, treated as an ASCII string.
2334 * The values read are assumed to be in 1/1000 seconds, and
2335 * are converted into jiffies.
2336 *
2337 * Returns 0 on success.
2338 */
2339 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2340 void __user *buffer, size_t *lenp, loff_t *ppos)
2341 {
2342 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2343 do_proc_dointvec_ms_jiffies_conv, NULL);
2344 }
2345
2346 static int proc_do_cad_pid(struct ctl_table *table, int write,
2347 void __user *buffer, size_t *lenp, loff_t *ppos)
2348 {
2349 struct pid *new_pid;
2350 pid_t tmp;
2351 int r;
2352
2353 tmp = pid_vnr(cad_pid);
2354
2355 r = __do_proc_dointvec(&tmp, table, write, buffer,
2356 lenp, ppos, NULL, NULL);
2357 if (r || !write)
2358 return r;
2359
2360 new_pid = find_get_pid(tmp);
2361 if (!new_pid)
2362 return -ESRCH;
2363
2364 put_pid(xchg(&cad_pid, new_pid));
2365 return 0;
2366 }
2367
2368 /**
2369 * proc_do_large_bitmap - read/write from/to a large bitmap
2370 * @table: the sysctl table
2371 * @write: %TRUE if this is a write to the sysctl file
2372 * @buffer: the user buffer
2373 * @lenp: the size of the user buffer
2374 * @ppos: file position
2375 *
2376 * The bitmap is stored at table->data and the bitmap length (in bits)
2377 * in table->maxlen.
2378 *
2379 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2380 * large bitmaps may be represented in a compact manner. Writing into
2381 * the file will clear the bitmap then update it with the given input.
2382 *
2383 * Returns 0 on success.
2384 */
2385 int proc_do_large_bitmap(struct ctl_table *table, int write,
2386 void __user *buffer, size_t *lenp, loff_t *ppos)
2387 {
2388 int err = 0;
2389 bool first = 1;
2390 size_t left = *lenp;
2391 unsigned long bitmap_len = table->maxlen;
2392 unsigned long *bitmap = (unsigned long *) table->data;
2393 unsigned long *tmp_bitmap = NULL;
2394 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2395
2396 if (!bitmap_len || !left || (*ppos && !write)) {
2397 *lenp = 0;
2398 return 0;
2399 }
2400
2401 if (write) {
2402 unsigned long page = 0;
2403 char *kbuf;
2404
2405 if (left > PAGE_SIZE - 1)
2406 left = PAGE_SIZE - 1;
2407
2408 page = __get_free_page(GFP_TEMPORARY);
2409 kbuf = (char *) page;
2410 if (!kbuf)
2411 return -ENOMEM;
2412 if (copy_from_user(kbuf, buffer, left)) {
2413 free_page(page);
2414 return -EFAULT;
2415 }
2416 kbuf[left] = 0;
2417
2418 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2419 GFP_KERNEL);
2420 if (!tmp_bitmap) {
2421 free_page(page);
2422 return -ENOMEM;
2423 }
2424 proc_skip_char(&kbuf, &left, '\n');
2425 while (!err && left) {
2426 unsigned long val_a, val_b;
2427 bool neg;
2428
2429 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2430 sizeof(tr_a), &c);
2431 if (err)
2432 break;
2433 if (val_a >= bitmap_len || neg) {
2434 err = -EINVAL;
2435 break;
2436 }
2437
2438 val_b = val_a;
2439 if (left) {
2440 kbuf++;
2441 left--;
2442 }
2443
2444 if (c == '-') {
2445 err = proc_get_long(&kbuf, &left, &val_b,
2446 &neg, tr_b, sizeof(tr_b),
2447 &c);
2448 if (err)
2449 break;
2450 if (val_b >= bitmap_len || neg ||
2451 val_a > val_b) {
2452 err = -EINVAL;
2453 break;
2454 }
2455 if (left) {
2456 kbuf++;
2457 left--;
2458 }
2459 }
2460
2461 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2462 first = 0;
2463 proc_skip_char(&kbuf, &left, '\n');
2464 }
2465 free_page(page);
2466 } else {
2467 unsigned long bit_a, bit_b = 0;
2468
2469 while (left) {
2470 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2471 if (bit_a >= bitmap_len)
2472 break;
2473 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2474 bit_a + 1) - 1;
2475
2476 if (!first) {
2477 err = proc_put_char(&buffer, &left, ',');
2478 if (err)
2479 break;
2480 }
2481 err = proc_put_long(&buffer, &left, bit_a, false);
2482 if (err)
2483 break;
2484 if (bit_a != bit_b) {
2485 err = proc_put_char(&buffer, &left, '-');
2486 if (err)
2487 break;
2488 err = proc_put_long(&buffer, &left, bit_b, false);
2489 if (err)
2490 break;
2491 }
2492
2493 first = 0; bit_b++;
2494 }
2495 if (!err)
2496 err = proc_put_char(&buffer, &left, '\n');
2497 }
2498
2499 if (!err) {
2500 if (write) {
2501 if (*ppos)
2502 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2503 else
2504 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2505 }
2506 kfree(tmp_bitmap);
2507 *lenp -= left;
2508 *ppos += *lenp;
2509 return 0;
2510 } else {
2511 kfree(tmp_bitmap);
2512 return err;
2513 }
2514 }
2515
2516 #else /* CONFIG_PROC_SYSCTL */
2517
2518 int proc_dostring(struct ctl_table *table, int write,
2519 void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521 return -ENOSYS;
2522 }
2523
2524 int proc_dointvec(struct ctl_table *table, int write,
2525 void __user *buffer, size_t *lenp, loff_t *ppos)
2526 {
2527 return -ENOSYS;
2528 }
2529
2530 int proc_dointvec_minmax(struct ctl_table *table, int write,
2531 void __user *buffer, size_t *lenp, loff_t *ppos)
2532 {
2533 return -ENOSYS;
2534 }
2535
2536 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2537 void __user *buffer, size_t *lenp, loff_t *ppos)
2538 {
2539 return -ENOSYS;
2540 }
2541
2542 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2543 void __user *buffer, size_t *lenp, loff_t *ppos)
2544 {
2545 return -ENOSYS;
2546 }
2547
2548 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2549 void __user *buffer, size_t *lenp, loff_t *ppos)
2550 {
2551 return -ENOSYS;
2552 }
2553
2554 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2555 void __user *buffer, size_t *lenp, loff_t *ppos)
2556 {
2557 return -ENOSYS;
2558 }
2559
2560 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2561 void __user *buffer,
2562 size_t *lenp, loff_t *ppos)
2563 {
2564 return -ENOSYS;
2565 }
2566
2567
2568 #endif /* CONFIG_PROC_SYSCTL */
2569
2570 /*
2571 * No sense putting this after each symbol definition, twice,
2572 * exception granted :-)
2573 */
2574 EXPORT_SYMBOL(proc_dointvec);
2575 EXPORT_SYMBOL(proc_dointvec_jiffies);
2576 EXPORT_SYMBOL(proc_dointvec_minmax);
2577 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2578 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2579 EXPORT_SYMBOL(proc_dostring);
2580 EXPORT_SYMBOL(proc_doulongvec_minmax);
2581 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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