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rtc/rtc-da9052: remove unneed devm_kfree call
[linux-2.6.git] / kernel / sysctl.c
blobb46f496405e4683c2850f189940a870c09d3f513
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 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
178 void __user *buffer, size_t *lenp, loff_t *ppos);
179 static int proc_dostring_coredump(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
181
182 #ifdef CONFIG_MAGIC_SYSRQ
183 /* Note: sysrq code uses it's own private copy */
184 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
185
186 static int sysrq_sysctl_handler(ctl_table *table, int write,
187 void __user *buffer, size_t *lenp,
188 loff_t *ppos)
189 {
190 int error;
191
192 error = proc_dointvec(table, write, buffer, lenp, ppos);
193 if (error)
194 return error;
195
196 if (write)
197 sysrq_toggle_support(__sysrq_enabled);
198
199 return 0;
200 }
201
202 #endif
203
204 static struct ctl_table kern_table[];
205 static struct ctl_table vm_table[];
206 static struct ctl_table fs_table[];
207 static struct ctl_table debug_table[];
208 static struct ctl_table dev_table[];
209 extern struct ctl_table random_table[];
210 #ifdef CONFIG_EPOLL
211 extern struct ctl_table epoll_table[];
212 #endif
213
214 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
215 int sysctl_legacy_va_layout;
216 #endif
217
218 /* The default sysctl tables: */
219
220 static struct ctl_table sysctl_base_table[] = {
221 {
222 .procname = "kernel",
223 .mode = 0555,
224 .child = kern_table,
225 },
226 {
227 .procname = "vm",
228 .mode = 0555,
229 .child = vm_table,
230 },
231 {
232 .procname = "fs",
233 .mode = 0555,
234 .child = fs_table,
235 },
236 {
237 .procname = "debug",
238 .mode = 0555,
239 .child = debug_table,
240 },
241 {
242 .procname = "dev",
243 .mode = 0555,
244 .child = dev_table,
245 },
246 { }
247 };
248
249 #ifdef CONFIG_SCHED_DEBUG
250 static int min_sched_granularity_ns = 100000; /* 100 usecs */
251 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
252 static int min_wakeup_granularity_ns; /* 0 usecs */
253 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
254 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
255 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
256 #endif
257
258 #ifdef CONFIG_COMPACTION
259 static int min_extfrag_threshold;
260 static int max_extfrag_threshold = 1000;
261 #endif
262
263 static struct ctl_table kern_table[] = {
264 {
265 .procname = "sched_child_runs_first",
266 .data = &sysctl_sched_child_runs_first,
267 .maxlen = sizeof(unsigned int),
268 .mode = 0644,
269 .proc_handler = proc_dointvec,
270 },
271 #ifdef CONFIG_SCHED_DEBUG
272 {
273 .procname = "sched_min_granularity_ns",
274 .data = &sysctl_sched_min_granularity,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
277 .proc_handler = sched_proc_update_handler,
278 .extra1 = &min_sched_granularity_ns,
279 .extra2 = &max_sched_granularity_ns,
280 },
281 {
282 .procname = "sched_latency_ns",
283 .data = &sysctl_sched_latency,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = sched_proc_update_handler,
287 .extra1 = &min_sched_granularity_ns,
288 .extra2 = &max_sched_granularity_ns,
289 },
290 {
291 .procname = "sched_wakeup_granularity_ns",
292 .data = &sysctl_sched_wakeup_granularity,
293 .maxlen = sizeof(unsigned int),
294 .mode = 0644,
295 .proc_handler = sched_proc_update_handler,
296 .extra1 = &min_wakeup_granularity_ns,
297 .extra2 = &max_wakeup_granularity_ns,
298 },
299 {
300 .procname = "sched_tunable_scaling",
301 .data = &sysctl_sched_tunable_scaling,
302 .maxlen = sizeof(enum sched_tunable_scaling),
303 .mode = 0644,
304 .proc_handler = sched_proc_update_handler,
305 .extra1 = &min_sched_tunable_scaling,
306 .extra2 = &max_sched_tunable_scaling,
307 },
308 {
309 .procname = "sched_migration_cost",
310 .data = &sysctl_sched_migration_cost,
311 .maxlen = sizeof(unsigned int),
312 .mode = 0644,
313 .proc_handler = proc_dointvec,
314 },
315 {
316 .procname = "sched_nr_migrate",
317 .data = &sysctl_sched_nr_migrate,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = proc_dointvec,
321 },
322 {
323 .procname = "sched_time_avg",
324 .data = &sysctl_sched_time_avg,
325 .maxlen = sizeof(unsigned int),
326 .mode = 0644,
327 .proc_handler = proc_dointvec,
328 },
329 {
330 .procname = "sched_shares_window",
331 .data = &sysctl_sched_shares_window,
332 .maxlen = sizeof(unsigned int),
333 .mode = 0644,
334 .proc_handler = proc_dointvec,
335 },
336 {
337 .procname = "timer_migration",
338 .data = &sysctl_timer_migration,
339 .maxlen = sizeof(unsigned int),
340 .mode = 0644,
341 .proc_handler = proc_dointvec_minmax,
342 .extra1 = &zero,
343 .extra2 = &one,
344 },
345 #endif
346 {
347 .procname = "sched_rt_period_us",
348 .data = &sysctl_sched_rt_period,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
351 .proc_handler = sched_rt_handler,
352 },
353 {
354 .procname = "sched_rt_runtime_us",
355 .data = &sysctl_sched_rt_runtime,
356 .maxlen = sizeof(int),
357 .mode = 0644,
358 .proc_handler = sched_rt_handler,
359 },
360 #ifdef CONFIG_SCHED_AUTOGROUP
361 {
362 .procname = "sched_autogroup_enabled",
363 .data = &sysctl_sched_autogroup_enabled,
364 .maxlen = sizeof(unsigned int),
365 .mode = 0644,
366 .proc_handler = proc_dointvec_minmax,
367 .extra1 = &zero,
368 .extra2 = &one,
369 },
370 #endif
371 #ifdef CONFIG_CFS_BANDWIDTH
372 {
373 .procname = "sched_cfs_bandwidth_slice_us",
374 .data = &sysctl_sched_cfs_bandwidth_slice,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec_minmax,
378 .extra1 = &one,
379 },
380 #endif
381 #ifdef CONFIG_PROVE_LOCKING
382 {
383 .procname = "prove_locking",
384 .data = &prove_locking,
385 .maxlen = sizeof(int),
386 .mode = 0644,
387 .proc_handler = proc_dointvec,
388 },
389 #endif
390 #ifdef CONFIG_LOCK_STAT
391 {
392 .procname = "lock_stat",
393 .data = &lock_stat,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec,
397 },
398 #endif
399 {
400 .procname = "panic",
401 .data = &panic_timeout,
402 .maxlen = sizeof(int),
403 .mode = 0644,
404 .proc_handler = proc_dointvec,
405 },
406 {
407 .procname = "core_uses_pid",
408 .data = &core_uses_pid,
409 .maxlen = sizeof(int),
410 .mode = 0644,
411 .proc_handler = proc_dointvec,
412 },
413 {
414 .procname = "core_pattern",
415 .data = core_pattern,
416 .maxlen = CORENAME_MAX_SIZE,
417 .mode = 0644,
418 .proc_handler = proc_dostring_coredump,
419 },
420 {
421 .procname = "core_pipe_limit",
422 .data = &core_pipe_limit,
423 .maxlen = sizeof(unsigned int),
424 .mode = 0644,
425 .proc_handler = proc_dointvec,
426 },
427 #ifdef CONFIG_PROC_SYSCTL
428 {
429 .procname = "tainted",
430 .maxlen = sizeof(long),
431 .mode = 0644,
432 .proc_handler = proc_taint,
433 },
434 #endif
435 #ifdef CONFIG_LATENCYTOP
436 {
437 .procname = "latencytop",
438 .data = &latencytop_enabled,
439 .maxlen = sizeof(int),
440 .mode = 0644,
441 .proc_handler = proc_dointvec,
442 },
443 #endif
444 #ifdef CONFIG_BLK_DEV_INITRD
445 {
446 .procname = "real-root-dev",
447 .data = &real_root_dev,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec,
451 },
452 #endif
453 {
454 .procname = "print-fatal-signals",
455 .data = &print_fatal_signals,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec,
459 },
460 #ifdef CONFIG_SPARC
461 {
462 .procname = "reboot-cmd",
463 .data = reboot_command,
464 .maxlen = 256,
465 .mode = 0644,
466 .proc_handler = proc_dostring,
467 },
468 {
469 .procname = "stop-a",
470 .data = &stop_a_enabled,
471 .maxlen = sizeof (int),
472 .mode = 0644,
473 .proc_handler = proc_dointvec,
474 },
475 {
476 .procname = "scons-poweroff",
477 .data = &scons_pwroff,
478 .maxlen = sizeof (int),
479 .mode = 0644,
480 .proc_handler = proc_dointvec,
481 },
482 #endif
483 #ifdef CONFIG_SPARC64
484 {
485 .procname = "tsb-ratio",
486 .data = &sysctl_tsb_ratio,
487 .maxlen = sizeof (int),
488 .mode = 0644,
489 .proc_handler = proc_dointvec,
490 },
491 #endif
492 #ifdef __hppa__
493 {
494 .procname = "soft-power",
495 .data = &pwrsw_enabled,
496 .maxlen = sizeof (int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 {
501 .procname = "unaligned-trap",
502 .data = &unaligned_enabled,
503 .maxlen = sizeof (int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507 #endif
508 {
509 .procname = "ctrl-alt-del",
510 .data = &C_A_D,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = proc_dointvec,
514 },
515 #ifdef CONFIG_FUNCTION_TRACER
516 {
517 .procname = "ftrace_enabled",
518 .data = &ftrace_enabled,
519 .maxlen = sizeof(int),
520 .mode = 0644,
521 .proc_handler = ftrace_enable_sysctl,
522 },
523 #endif
524 #ifdef CONFIG_STACK_TRACER
525 {
526 .procname = "stack_tracer_enabled",
527 .data = &stack_tracer_enabled,
528 .maxlen = sizeof(int),
529 .mode = 0644,
530 .proc_handler = stack_trace_sysctl,
531 },
532 #endif
533 #ifdef CONFIG_TRACING
534 {
535 .procname = "ftrace_dump_on_oops",
536 .data = &ftrace_dump_on_oops,
537 .maxlen = sizeof(int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec,
540 },
541 #endif
542 #ifdef CONFIG_MODULES
543 {
544 .procname = "modprobe",
545 .data = &modprobe_path,
546 .maxlen = KMOD_PATH_LEN,
547 .mode = 0644,
548 .proc_handler = proc_dostring,
549 },
550 {
551 .procname = "modules_disabled",
552 .data = &modules_disabled,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 /* only handle a transition from default "0" to "1" */
556 .proc_handler = proc_dointvec_minmax,
557 .extra1 = &one,
558 .extra2 = &one,
559 },
560 #endif
561 #ifdef CONFIG_HOTPLUG
562 {
563 .procname = "hotplug",
564 .data = &uevent_helper,
565 .maxlen = UEVENT_HELPER_PATH_LEN,
566 .mode = 0644,
567 .proc_handler = proc_dostring,
568 },
569 #endif
570 #ifdef CONFIG_CHR_DEV_SG
571 {
572 .procname = "sg-big-buff",
573 .data = &sg_big_buff,
574 .maxlen = sizeof (int),
575 .mode = 0444,
576 .proc_handler = proc_dointvec,
577 },
578 #endif
579 #ifdef CONFIG_BSD_PROCESS_ACCT
580 {
581 .procname = "acct",
582 .data = &acct_parm,
583 .maxlen = 3*sizeof(int),
584 .mode = 0644,
585 .proc_handler = proc_dointvec,
586 },
587 #endif
588 #ifdef CONFIG_MAGIC_SYSRQ
589 {
590 .procname = "sysrq",
591 .data = &__sysrq_enabled,
592 .maxlen = sizeof (int),
593 .mode = 0644,
594 .proc_handler = sysrq_sysctl_handler,
595 },
596 #endif
597 #ifdef CONFIG_PROC_SYSCTL
598 {
599 .procname = "cad_pid",
600 .data = NULL,
601 .maxlen = sizeof (int),
602 .mode = 0600,
603 .proc_handler = proc_do_cad_pid,
604 },
605 #endif
606 {
607 .procname = "threads-max",
608 .data = &max_threads,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = proc_dointvec,
612 },
613 {
614 .procname = "random",
615 .mode = 0555,
616 .child = random_table,
617 },
618 {
619 .procname = "usermodehelper",
620 .mode = 0555,
621 .child = usermodehelper_table,
622 },
623 {
624 .procname = "overflowuid",
625 .data = &overflowuid,
626 .maxlen = sizeof(int),
627 .mode = 0644,
628 .proc_handler = proc_dointvec_minmax,
629 .extra1 = &minolduid,
630 .extra2 = &maxolduid,
631 },
632 {
633 .procname = "overflowgid",
634 .data = &overflowgid,
635 .maxlen = sizeof(int),
636 .mode = 0644,
637 .proc_handler = proc_dointvec_minmax,
638 .extra1 = &minolduid,
639 .extra2 = &maxolduid,
640 },
641 #ifdef CONFIG_S390
642 #ifdef CONFIG_MATHEMU
643 {
644 .procname = "ieee_emulation_warnings",
645 .data = &sysctl_ieee_emulation_warnings,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec,
649 },
650 #endif
651 {
652 .procname = "userprocess_debug",
653 .data = &show_unhandled_signals,
654 .maxlen = sizeof(int),
655 .mode = 0644,
656 .proc_handler = proc_dointvec,
657 },
658 #endif
659 {
660 .procname = "pid_max",
661 .data = &pid_max,
662 .maxlen = sizeof (int),
663 .mode = 0644,
664 .proc_handler = proc_dointvec_minmax,
665 .extra1 = &pid_max_min,
666 .extra2 = &pid_max_max,
667 },
668 {
669 .procname = "panic_on_oops",
670 .data = &panic_on_oops,
671 .maxlen = sizeof(int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec,
674 },
675 #if defined CONFIG_PRINTK
676 {
677 .procname = "printk",
678 .data = &console_loglevel,
679 .maxlen = 4*sizeof(int),
680 .mode = 0644,
681 .proc_handler = proc_dointvec,
682 },
683 {
684 .procname = "printk_ratelimit",
685 .data = &printk_ratelimit_state.interval,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec_jiffies,
689 },
690 {
691 .procname = "printk_ratelimit_burst",
692 .data = &printk_ratelimit_state.burst,
693 .maxlen = sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec,
696 },
697 {
698 .procname = "printk_delay",
699 .data = &printk_delay_msec,
700 .maxlen = sizeof(int),
701 .mode = 0644,
702 .proc_handler = proc_dointvec_minmax,
703 .extra1 = &zero,
704 .extra2 = &ten_thousand,
705 },
706 {
707 .procname = "dmesg_restrict",
708 .data = &dmesg_restrict,
709 .maxlen = sizeof(int),
710 .mode = 0644,
711 .proc_handler = proc_dointvec_minmax_sysadmin,
712 .extra1 = &zero,
713 .extra2 = &one,
714 },
715 {
716 .procname = "kptr_restrict",
717 .data = &kptr_restrict,
718 .maxlen = sizeof(int),
719 .mode = 0644,
720 .proc_handler = proc_dointvec_minmax_sysadmin,
721 .extra1 = &zero,
722 .extra2 = &two,
723 },
724 #endif
725 {
726 .procname = "ngroups_max",
727 .data = &ngroups_max,
728 .maxlen = sizeof (int),
729 .mode = 0444,
730 .proc_handler = proc_dointvec,
731 },
732 {
733 .procname = "cap_last_cap",
734 .data = (void *)&cap_last_cap,
735 .maxlen = sizeof(int),
736 .mode = 0444,
737 .proc_handler = proc_dointvec,
738 },
739 #if defined(CONFIG_LOCKUP_DETECTOR)
740 {
741 .procname = "watchdog",
742 .data = &watchdog_enabled,
743 .maxlen = sizeof (int),
744 .mode = 0644,
745 .proc_handler = proc_dowatchdog,
746 .extra1 = &zero,
747 .extra2 = &one,
748 },
749 {
750 .procname = "watchdog_thresh",
751 .data = &watchdog_thresh,
752 .maxlen = sizeof(int),
753 .mode = 0644,
754 .proc_handler = proc_dowatchdog,
755 .extra1 = &neg_one,
756 .extra2 = &sixty,
757 },
758 {
759 .procname = "softlockup_panic",
760 .data = &softlockup_panic,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec_minmax,
764 .extra1 = &zero,
765 .extra2 = &one,
766 },
767 {
768 .procname = "nmi_watchdog",
769 .data = &watchdog_enabled,
770 .maxlen = sizeof (int),
771 .mode = 0644,
772 .proc_handler = proc_dowatchdog,
773 .extra1 = &zero,
774 .extra2 = &one,
775 },
776 #endif
777 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
778 {
779 .procname = "unknown_nmi_panic",
780 .data = &unknown_nmi_panic,
781 .maxlen = sizeof (int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec,
784 },
785 #endif
786 #if defined(CONFIG_X86)
787 {
788 .procname = "panic_on_unrecovered_nmi",
789 .data = &panic_on_unrecovered_nmi,
790 .maxlen = sizeof(int),
791 .mode = 0644,
792 .proc_handler = proc_dointvec,
793 },
794 {
795 .procname = "panic_on_io_nmi",
796 .data = &panic_on_io_nmi,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec,
800 },
801 #ifdef CONFIG_DEBUG_STACKOVERFLOW
802 {
803 .procname = "panic_on_stackoverflow",
804 .data = &sysctl_panic_on_stackoverflow,
805 .maxlen = sizeof(int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec,
808 },
809 #endif
810 {
811 .procname = "bootloader_type",
812 .data = &bootloader_type,
813 .maxlen = sizeof (int),
814 .mode = 0444,
815 .proc_handler = proc_dointvec,
816 },
817 {
818 .procname = "bootloader_version",
819 .data = &bootloader_version,
820 .maxlen = sizeof (int),
821 .mode = 0444,
822 .proc_handler = proc_dointvec,
823 },
824 {
825 .procname = "kstack_depth_to_print",
826 .data = &kstack_depth_to_print,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec,
830 },
831 {
832 .procname = "io_delay_type",
833 .data = &io_delay_type,
834 .maxlen = sizeof(int),
835 .mode = 0644,
836 .proc_handler = proc_dointvec,
837 },
838 #endif
839 #if defined(CONFIG_MMU)
840 {
841 .procname = "randomize_va_space",
842 .data = &randomize_va_space,
843 .maxlen = sizeof(int),
844 .mode = 0644,
845 .proc_handler = proc_dointvec,
846 },
847 #endif
848 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
849 {
850 .procname = "spin_retry",
851 .data = &spin_retry,
852 .maxlen = sizeof (int),
853 .mode = 0644,
854 .proc_handler = proc_dointvec,
855 },
856 #endif
857 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
858 {
859 .procname = "acpi_video_flags",
860 .data = &acpi_realmode_flags,
861 .maxlen = sizeof (unsigned long),
862 .mode = 0644,
863 .proc_handler = proc_doulongvec_minmax,
864 },
865 #endif
866 #ifdef CONFIG_IA64
867 {
868 .procname = "ignore-unaligned-usertrap",
869 .data = &no_unaligned_warning,
870 .maxlen = sizeof (int),
871 .mode = 0644,
872 .proc_handler = proc_dointvec,
873 },
874 {
875 .procname = "unaligned-dump-stack",
876 .data = &unaligned_dump_stack,
877 .maxlen = sizeof (int),
878 .mode = 0644,
879 .proc_handler = proc_dointvec,
880 },
881 #endif
882 #ifdef CONFIG_DETECT_HUNG_TASK
883 {
884 .procname = "hung_task_panic",
885 .data = &sysctl_hung_task_panic,
886 .maxlen = sizeof(int),
887 .mode = 0644,
888 .proc_handler = proc_dointvec_minmax,
889 .extra1 = &zero,
890 .extra2 = &one,
891 },
892 {
893 .procname = "hung_task_check_count",
894 .data = &sysctl_hung_task_check_count,
895 .maxlen = sizeof(unsigned long),
896 .mode = 0644,
897 .proc_handler = proc_doulongvec_minmax,
898 },
899 {
900 .procname = "hung_task_timeout_secs",
901 .data = &sysctl_hung_task_timeout_secs,
902 .maxlen = sizeof(unsigned long),
903 .mode = 0644,
904 .proc_handler = proc_dohung_task_timeout_secs,
905 },
906 {
907 .procname = "hung_task_warnings",
908 .data = &sysctl_hung_task_warnings,
909 .maxlen = sizeof(unsigned long),
910 .mode = 0644,
911 .proc_handler = proc_doulongvec_minmax,
912 },
913 #endif
914 #ifdef CONFIG_COMPAT
915 {
916 .procname = "compat-log",
917 .data = &compat_log,
918 .maxlen = sizeof (int),
919 .mode = 0644,
920 .proc_handler = proc_dointvec,
921 },
922 #endif
923 #ifdef CONFIG_RT_MUTEXES
924 {
925 .procname = "max_lock_depth",
926 .data = &max_lock_depth,
927 .maxlen = sizeof(int),
928 .mode = 0644,
929 .proc_handler = proc_dointvec,
930 },
931 #endif
932 {
933 .procname = "poweroff_cmd",
934 .data = &poweroff_cmd,
935 .maxlen = POWEROFF_CMD_PATH_LEN,
936 .mode = 0644,
937 .proc_handler = proc_dostring,
938 },
939 #ifdef CONFIG_KEYS
940 {
941 .procname = "keys",
942 .mode = 0555,
943 .child = key_sysctls,
944 },
945 #endif
946 #ifdef CONFIG_RCU_TORTURE_TEST
947 {
948 .procname = "rcutorture_runnable",
949 .data = &rcutorture_runnable,
950 .maxlen = sizeof(int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec,
953 },
954 #endif
955 #ifdef CONFIG_PERF_EVENTS
956 /*
957 * User-space scripts rely on the existence of this file
958 * as a feature check for perf_events being enabled.
959 *
960 * So it's an ABI, do not remove!
961 */
962 {
963 .procname = "perf_event_paranoid",
964 .data = &sysctl_perf_event_paranoid,
965 .maxlen = sizeof(sysctl_perf_event_paranoid),
966 .mode = 0644,
967 .proc_handler = proc_dointvec,
968 },
969 {
970 .procname = "perf_event_mlock_kb",
971 .data = &sysctl_perf_event_mlock,
972 .maxlen = sizeof(sysctl_perf_event_mlock),
973 .mode = 0644,
974 .proc_handler = proc_dointvec,
975 },
976 {
977 .procname = "perf_event_max_sample_rate",
978 .data = &sysctl_perf_event_sample_rate,
979 .maxlen = sizeof(sysctl_perf_event_sample_rate),
980 .mode = 0644,
981 .proc_handler = perf_proc_update_handler,
982 },
983 #endif
984 #ifdef CONFIG_KMEMCHECK
985 {
986 .procname = "kmemcheck",
987 .data = &kmemcheck_enabled,
988 .maxlen = sizeof(int),
989 .mode = 0644,
990 .proc_handler = proc_dointvec,
991 },
992 #endif
993 #ifdef CONFIG_BLOCK
994 {
995 .procname = "blk_iopoll",
996 .data = &blk_iopoll_enabled,
997 .maxlen = sizeof(int),
998 .mode = 0644,
999 .proc_handler = proc_dointvec,
1000 },
1001 #endif
1002 { }
1003 };
1004
1005 static struct ctl_table vm_table[] = {
1006 {
1007 .procname = "overcommit_memory",
1008 .data = &sysctl_overcommit_memory,
1009 .maxlen = sizeof(sysctl_overcommit_memory),
1010 .mode = 0644,
1011 .proc_handler = proc_dointvec_minmax,
1012 .extra1 = &zero,
1013 .extra2 = &two,
1014 },
1015 {
1016 .procname = "panic_on_oom",
1017 .data = &sysctl_panic_on_oom,
1018 .maxlen = sizeof(sysctl_panic_on_oom),
1019 .mode = 0644,
1020 .proc_handler = proc_dointvec_minmax,
1021 .extra1 = &zero,
1022 .extra2 = &two,
1023 },
1024 {
1025 .procname = "oom_kill_allocating_task",
1026 .data = &sysctl_oom_kill_allocating_task,
1027 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1028 .mode = 0644,
1029 .proc_handler = proc_dointvec,
1030 },
1031 {
1032 .procname = "oom_dump_tasks",
1033 .data = &sysctl_oom_dump_tasks,
1034 .maxlen = sizeof(sysctl_oom_dump_tasks),
1035 .mode = 0644,
1036 .proc_handler = proc_dointvec,
1037 },
1038 {
1039 .procname = "overcommit_ratio",
1040 .data = &sysctl_overcommit_ratio,
1041 .maxlen = sizeof(sysctl_overcommit_ratio),
1042 .mode = 0644,
1043 .proc_handler = proc_dointvec,
1044 },
1045 {
1046 .procname = "page-cluster",
1047 .data = &page_cluster,
1048 .maxlen = sizeof(int),
1049 .mode = 0644,
1050 .proc_handler = proc_dointvec_minmax,
1051 .extra1 = &zero,
1052 },
1053 {
1054 .procname = "dirty_background_ratio",
1055 .data = &dirty_background_ratio,
1056 .maxlen = sizeof(dirty_background_ratio),
1057 .mode = 0644,
1058 .proc_handler = dirty_background_ratio_handler,
1059 .extra1 = &zero,
1060 .extra2 = &one_hundred,
1061 },
1062 {
1063 .procname = "dirty_background_bytes",
1064 .data = &dirty_background_bytes,
1065 .maxlen = sizeof(dirty_background_bytes),
1066 .mode = 0644,
1067 .proc_handler = dirty_background_bytes_handler,
1068 .extra1 = &one_ul,
1069 },
1070 {
1071 .procname = "dirty_ratio",
1072 .data = &vm_dirty_ratio,
1073 .maxlen = sizeof(vm_dirty_ratio),
1074 .mode = 0644,
1075 .proc_handler = dirty_ratio_handler,
1076 .extra1 = &zero,
1077 .extra2 = &one_hundred,
1078 },
1079 {
1080 .procname = "dirty_bytes",
1081 .data = &vm_dirty_bytes,
1082 .maxlen = sizeof(vm_dirty_bytes),
1083 .mode = 0644,
1084 .proc_handler = dirty_bytes_handler,
1085 .extra1 = &dirty_bytes_min,
1086 },
1087 {
1088 .procname = "dirty_writeback_centisecs",
1089 .data = &dirty_writeback_interval,
1090 .maxlen = sizeof(dirty_writeback_interval),
1091 .mode = 0644,
1092 .proc_handler = dirty_writeback_centisecs_handler,
1093 },
1094 {
1095 .procname = "dirty_expire_centisecs",
1096 .data = &dirty_expire_interval,
1097 .maxlen = sizeof(dirty_expire_interval),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec_minmax,
1100 .extra1 = &zero,
1101 },
1102 {
1103 .procname = "nr_pdflush_threads",
1104 .data = &nr_pdflush_threads,
1105 .maxlen = sizeof nr_pdflush_threads,
1106 .mode = 0444 /* read-only*/,
1107 .proc_handler = proc_dointvec,
1108 },
1109 {
1110 .procname = "swappiness",
1111 .data = &vm_swappiness,
1112 .maxlen = sizeof(vm_swappiness),
1113 .mode = 0644,
1114 .proc_handler = proc_dointvec_minmax,
1115 .extra1 = &zero,
1116 .extra2 = &one_hundred,
1117 },
1118 #ifdef CONFIG_HUGETLB_PAGE
1119 {
1120 .procname = "nr_hugepages",
1121 .data = NULL,
1122 .maxlen = sizeof(unsigned long),
1123 .mode = 0644,
1124 .proc_handler = hugetlb_sysctl_handler,
1125 .extra1 = (void *)&hugetlb_zero,
1126 .extra2 = (void *)&hugetlb_infinity,
1127 },
1128 #ifdef CONFIG_NUMA
1129 {
1130 .procname = "nr_hugepages_mempolicy",
1131 .data = NULL,
1132 .maxlen = sizeof(unsigned long),
1133 .mode = 0644,
1134 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1135 .extra1 = (void *)&hugetlb_zero,
1136 .extra2 = (void *)&hugetlb_infinity,
1137 },
1138 #endif
1139 {
1140 .procname = "hugetlb_shm_group",
1141 .data = &sysctl_hugetlb_shm_group,
1142 .maxlen = sizeof(gid_t),
1143 .mode = 0644,
1144 .proc_handler = proc_dointvec,
1145 },
1146 {
1147 .procname = "hugepages_treat_as_movable",
1148 .data = &hugepages_treat_as_movable,
1149 .maxlen = sizeof(int),
1150 .mode = 0644,
1151 .proc_handler = hugetlb_treat_movable_handler,
1152 },
1153 {
1154 .procname = "nr_overcommit_hugepages",
1155 .data = NULL,
1156 .maxlen = sizeof(unsigned long),
1157 .mode = 0644,
1158 .proc_handler = hugetlb_overcommit_handler,
1159 .extra1 = (void *)&hugetlb_zero,
1160 .extra2 = (void *)&hugetlb_infinity,
1161 },
1162 #endif
1163 {
1164 .procname = "lowmem_reserve_ratio",
1165 .data = &sysctl_lowmem_reserve_ratio,
1166 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1167 .mode = 0644,
1168 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1169 },
1170 {
1171 .procname = "drop_caches",
1172 .data = &sysctl_drop_caches,
1173 .maxlen = sizeof(int),
1174 .mode = 0644,
1175 .proc_handler = drop_caches_sysctl_handler,
1176 .extra1 = &one,
1177 .extra2 = &three,
1178 },
1179 #ifdef CONFIG_COMPACTION
1180 {
1181 .procname = "compact_memory",
1182 .data = &sysctl_compact_memory,
1183 .maxlen = sizeof(int),
1184 .mode = 0200,
1185 .proc_handler = sysctl_compaction_handler,
1186 },
1187 {
1188 .procname = "extfrag_threshold",
1189 .data = &sysctl_extfrag_threshold,
1190 .maxlen = sizeof(int),
1191 .mode = 0644,
1192 .proc_handler = sysctl_extfrag_handler,
1193 .extra1 = &min_extfrag_threshold,
1194 .extra2 = &max_extfrag_threshold,
1195 },
1196
1197 #endif /* CONFIG_COMPACTION */
1198 {
1199 .procname = "min_free_kbytes",
1200 .data = &min_free_kbytes,
1201 .maxlen = sizeof(min_free_kbytes),
1202 .mode = 0644,
1203 .proc_handler = min_free_kbytes_sysctl_handler,
1204 .extra1 = &zero,
1205 },
1206 {
1207 .procname = "percpu_pagelist_fraction",
1208 .data = &percpu_pagelist_fraction,
1209 .maxlen = sizeof(percpu_pagelist_fraction),
1210 .mode = 0644,
1211 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1212 .extra1 = &min_percpu_pagelist_fract,
1213 },
1214 #ifdef CONFIG_MMU
1215 {
1216 .procname = "max_map_count",
1217 .data = &sysctl_max_map_count,
1218 .maxlen = sizeof(sysctl_max_map_count),
1219 .mode = 0644,
1220 .proc_handler = proc_dointvec_minmax,
1221 .extra1 = &zero,
1222 },
1223 #else
1224 {
1225 .procname = "nr_trim_pages",
1226 .data = &sysctl_nr_trim_pages,
1227 .maxlen = sizeof(sysctl_nr_trim_pages),
1228 .mode = 0644,
1229 .proc_handler = proc_dointvec_minmax,
1230 .extra1 = &zero,
1231 },
1232 #endif
1233 {
1234 .procname = "laptop_mode",
1235 .data = &laptop_mode,
1236 .maxlen = sizeof(laptop_mode),
1237 .mode = 0644,
1238 .proc_handler = proc_dointvec_jiffies,
1239 },
1240 {
1241 .procname = "block_dump",
1242 .data = &block_dump,
1243 .maxlen = sizeof(block_dump),
1244 .mode = 0644,
1245 .proc_handler = proc_dointvec,
1246 .extra1 = &zero,
1247 },
1248 {
1249 .procname = "vfs_cache_pressure",
1250 .data = &sysctl_vfs_cache_pressure,
1251 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1252 .mode = 0644,
1253 .proc_handler = proc_dointvec,
1254 .extra1 = &zero,
1255 },
1256 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1257 {
1258 .procname = "legacy_va_layout",
1259 .data = &sysctl_legacy_va_layout,
1260 .maxlen = sizeof(sysctl_legacy_va_layout),
1261 .mode = 0644,
1262 .proc_handler = proc_dointvec,
1263 .extra1 = &zero,
1264 },
1265 #endif
1266 #ifdef CONFIG_NUMA
1267 {
1268 .procname = "zone_reclaim_mode",
1269 .data = &zone_reclaim_mode,
1270 .maxlen = sizeof(zone_reclaim_mode),
1271 .mode = 0644,
1272 .proc_handler = proc_dointvec,
1273 .extra1 = &zero,
1274 },
1275 {
1276 .procname = "min_unmapped_ratio",
1277 .data = &sysctl_min_unmapped_ratio,
1278 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1279 .mode = 0644,
1280 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1281 .extra1 = &zero,
1282 .extra2 = &one_hundred,
1283 },
1284 {
1285 .procname = "min_slab_ratio",
1286 .data = &sysctl_min_slab_ratio,
1287 .maxlen = sizeof(sysctl_min_slab_ratio),
1288 .mode = 0644,
1289 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1290 .extra1 = &zero,
1291 .extra2 = &one_hundred,
1292 },
1293 #endif
1294 #ifdef CONFIG_SMP
1295 {
1296 .procname = "stat_interval",
1297 .data = &sysctl_stat_interval,
1298 .maxlen = sizeof(sysctl_stat_interval),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec_jiffies,
1301 },
1302 #endif
1303 #ifdef CONFIG_MMU
1304 {
1305 .procname = "mmap_min_addr",
1306 .data = &dac_mmap_min_addr,
1307 .maxlen = sizeof(unsigned long),
1308 .mode = 0644,
1309 .proc_handler = mmap_min_addr_handler,
1310 },
1311 #endif
1312 #ifdef CONFIG_NUMA
1313 {
1314 .procname = "numa_zonelist_order",
1315 .data = &numa_zonelist_order,
1316 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1317 .mode = 0644,
1318 .proc_handler = numa_zonelist_order_handler,
1319 },
1320 #endif
1321 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1322 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1323 {
1324 .procname = "vdso_enabled",
1325 .data = &vdso_enabled,
1326 .maxlen = sizeof(vdso_enabled),
1327 .mode = 0644,
1328 .proc_handler = proc_dointvec,
1329 .extra1 = &zero,
1330 },
1331 #endif
1332 #ifdef CONFIG_HIGHMEM
1333 {
1334 .procname = "highmem_is_dirtyable",
1335 .data = &vm_highmem_is_dirtyable,
1336 .maxlen = sizeof(vm_highmem_is_dirtyable),
1337 .mode = 0644,
1338 .proc_handler = proc_dointvec_minmax,
1339 .extra1 = &zero,
1340 .extra2 = &one,
1341 },
1342 #endif
1343 {
1344 .procname = "scan_unevictable_pages",
1345 .data = &scan_unevictable_pages,
1346 .maxlen = sizeof(scan_unevictable_pages),
1347 .mode = 0644,
1348 .proc_handler = scan_unevictable_handler,
1349 },
1350 #ifdef CONFIG_MEMORY_FAILURE
1351 {
1352 .procname = "memory_failure_early_kill",
1353 .data = &sysctl_memory_failure_early_kill,
1354 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1355 .mode = 0644,
1356 .proc_handler = proc_dointvec_minmax,
1357 .extra1 = &zero,
1358 .extra2 = &one,
1359 },
1360 {
1361 .procname = "memory_failure_recovery",
1362 .data = &sysctl_memory_failure_recovery,
1363 .maxlen = sizeof(sysctl_memory_failure_recovery),
1364 .mode = 0644,
1365 .proc_handler = proc_dointvec_minmax,
1366 .extra1 = &zero,
1367 .extra2 = &one,
1368 },
1369 #endif
1370 { }
1371 };
1372
1373 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1374 static struct ctl_table binfmt_misc_table[] = {
1375 { }
1376 };
1377 #endif
1378
1379 static struct ctl_table fs_table[] = {
1380 {
1381 .procname = "inode-nr",
1382 .data = &inodes_stat,
1383 .maxlen = 2*sizeof(int),
1384 .mode = 0444,
1385 .proc_handler = proc_nr_inodes,
1386 },
1387 {
1388 .procname = "inode-state",
1389 .data = &inodes_stat,
1390 .maxlen = 7*sizeof(int),
1391 .mode = 0444,
1392 .proc_handler = proc_nr_inodes,
1393 },
1394 {
1395 .procname = "file-nr",
1396 .data = &files_stat,
1397 .maxlen = sizeof(files_stat),
1398 .mode = 0444,
1399 .proc_handler = proc_nr_files,
1400 },
1401 {
1402 .procname = "file-max",
1403 .data = &files_stat.max_files,
1404 .maxlen = sizeof(files_stat.max_files),
1405 .mode = 0644,
1406 .proc_handler = proc_doulongvec_minmax,
1407 },
1408 {
1409 .procname = "nr_open",
1410 .data = &sysctl_nr_open,
1411 .maxlen = sizeof(int),
1412 .mode = 0644,
1413 .proc_handler = proc_dointvec_minmax,
1414 .extra1 = &sysctl_nr_open_min,
1415 .extra2 = &sysctl_nr_open_max,
1416 },
1417 {
1418 .procname = "dentry-state",
1419 .data = &dentry_stat,
1420 .maxlen = 6*sizeof(int),
1421 .mode = 0444,
1422 .proc_handler = proc_nr_dentry,
1423 },
1424 {
1425 .procname = "overflowuid",
1426 .data = &fs_overflowuid,
1427 .maxlen = sizeof(int),
1428 .mode = 0644,
1429 .proc_handler = proc_dointvec_minmax,
1430 .extra1 = &minolduid,
1431 .extra2 = &maxolduid,
1432 },
1433 {
1434 .procname = "overflowgid",
1435 .data = &fs_overflowgid,
1436 .maxlen = sizeof(int),
1437 .mode = 0644,
1438 .proc_handler = proc_dointvec_minmax,
1439 .extra1 = &minolduid,
1440 .extra2 = &maxolduid,
1441 },
1442 #ifdef CONFIG_FILE_LOCKING
1443 {
1444 .procname = "leases-enable",
1445 .data = &leases_enable,
1446 .maxlen = sizeof(int),
1447 .mode = 0644,
1448 .proc_handler = proc_dointvec,
1449 },
1450 #endif
1451 #ifdef CONFIG_DNOTIFY
1452 {
1453 .procname = "dir-notify-enable",
1454 .data = &dir_notify_enable,
1455 .maxlen = sizeof(int),
1456 .mode = 0644,
1457 .proc_handler = proc_dointvec,
1458 },
1459 #endif
1460 #ifdef CONFIG_MMU
1461 #ifdef CONFIG_FILE_LOCKING
1462 {
1463 .procname = "lease-break-time",
1464 .data = &lease_break_time,
1465 .maxlen = sizeof(int),
1466 .mode = 0644,
1467 .proc_handler = proc_dointvec,
1468 },
1469 #endif
1470 #ifdef CONFIG_AIO
1471 {
1472 .procname = "aio-nr",
1473 .data = &aio_nr,
1474 .maxlen = sizeof(aio_nr),
1475 .mode = 0444,
1476 .proc_handler = proc_doulongvec_minmax,
1477 },
1478 {
1479 .procname = "aio-max-nr",
1480 .data = &aio_max_nr,
1481 .maxlen = sizeof(aio_max_nr),
1482 .mode = 0644,
1483 .proc_handler = proc_doulongvec_minmax,
1484 },
1485 #endif /* CONFIG_AIO */
1486 #ifdef CONFIG_INOTIFY_USER
1487 {
1488 .procname = "inotify",
1489 .mode = 0555,
1490 .child = inotify_table,
1491 },
1492 #endif
1493 #ifdef CONFIG_EPOLL
1494 {
1495 .procname = "epoll",
1496 .mode = 0555,
1497 .child = epoll_table,
1498 },
1499 #endif
1500 #endif
1501 {
1502 .procname = "suid_dumpable",
1503 .data = &suid_dumpable,
1504 .maxlen = sizeof(int),
1505 .mode = 0644,
1506 .proc_handler = proc_dointvec_minmax_coredump,
1507 .extra1 = &zero,
1508 .extra2 = &two,
1509 },
1510 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1511 {
1512 .procname = "binfmt_misc",
1513 .mode = 0555,
1514 .child = binfmt_misc_table,
1515 },
1516 #endif
1517 {
1518 .procname = "pipe-max-size",
1519 .data = &pipe_max_size,
1520 .maxlen = sizeof(int),
1521 .mode = 0644,
1522 .proc_handler = &pipe_proc_fn,
1523 .extra1 = &pipe_min_size,
1524 },
1525 { }
1526 };
1527
1528 static struct ctl_table debug_table[] = {
1529 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1530 defined(CONFIG_S390) || defined(CONFIG_TILE)
1531 {
1532 .procname = "exception-trace",
1533 .data = &show_unhandled_signals,
1534 .maxlen = sizeof(int),
1535 .mode = 0644,
1536 .proc_handler = proc_dointvec
1537 },
1538 #endif
1539 #if defined(CONFIG_OPTPROBES)
1540 {
1541 .procname = "kprobes-optimization",
1542 .data = &sysctl_kprobes_optimization,
1543 .maxlen = sizeof(int),
1544 .mode = 0644,
1545 .proc_handler = proc_kprobes_optimization_handler,
1546 .extra1 = &zero,
1547 .extra2 = &one,
1548 },
1549 #endif
1550 { }
1551 };
1552
1553 static struct ctl_table dev_table[] = {
1554 { }
1555 };
1556
1557 int __init sysctl_init(void)
1558 {
1559 register_sysctl_table(sysctl_base_table);
1560 return 0;
1561 }
1562
1563 #endif /* CONFIG_SYSCTL */
1564
1565 /*
1566 * /proc/sys support
1567 */
1568
1569 #ifdef CONFIG_PROC_SYSCTL
1570
1571 static int _proc_do_string(void* data, int maxlen, int write,
1572 void __user *buffer,
1573 size_t *lenp, loff_t *ppos)
1574 {
1575 size_t len;
1576 char __user *p;
1577 char c;
1578
1579 if (!data || !maxlen || !*lenp) {
1580 *lenp = 0;
1581 return 0;
1582 }
1583
1584 if (write) {
1585 len = 0;
1586 p = buffer;
1587 while (len < *lenp) {
1588 if (get_user(c, p++))
1589 return -EFAULT;
1590 if (c == 0 || c == '\n')
1591 break;
1592 len++;
1593 }
1594 if (len >= maxlen)
1595 len = maxlen-1;
1596 if(copy_from_user(data, buffer, len))
1597 return -EFAULT;
1598 ((char *) data)[len] = 0;
1599 *ppos += *lenp;
1600 } else {
1601 len = strlen(data);
1602 if (len > maxlen)
1603 len = maxlen;
1604
1605 if (*ppos > len) {
1606 *lenp = 0;
1607 return 0;
1608 }
1609
1610 data += *ppos;
1611 len -= *ppos;
1612
1613 if (len > *lenp)
1614 len = *lenp;
1615 if (len)
1616 if(copy_to_user(buffer, data, len))
1617 return -EFAULT;
1618 if (len < *lenp) {
1619 if(put_user('\n', ((char __user *) buffer) + len))
1620 return -EFAULT;
1621 len++;
1622 }
1623 *lenp = len;
1624 *ppos += len;
1625 }
1626 return 0;
1627 }
1628
1629 /**
1630 * proc_dostring - read a string sysctl
1631 * @table: the sysctl table
1632 * @write: %TRUE if this is a write to the sysctl file
1633 * @buffer: the user buffer
1634 * @lenp: the size of the user buffer
1635 * @ppos: file position
1636 *
1637 * Reads/writes a string from/to the user buffer. If the kernel
1638 * buffer provided is not large enough to hold the string, the
1639 * string is truncated. The copied string is %NULL-terminated.
1640 * If the string is being read by the user process, it is copied
1641 * and a newline '\n' is added. It is truncated if the buffer is
1642 * not large enough.
1643 *
1644 * Returns 0 on success.
1645 */
1646 int proc_dostring(struct ctl_table *table, int write,
1647 void __user *buffer, size_t *lenp, loff_t *ppos)
1648 {
1649 return _proc_do_string(table->data, table->maxlen, write,
1650 buffer, lenp, ppos);
1651 }
1652
1653 static size_t proc_skip_spaces(char **buf)
1654 {
1655 size_t ret;
1656 char *tmp = skip_spaces(*buf);
1657 ret = tmp - *buf;
1658 *buf = tmp;
1659 return ret;
1660 }
1661
1662 static void proc_skip_char(char **buf, size_t *size, const char v)
1663 {
1664 while (*size) {
1665 if (**buf != v)
1666 break;
1667 (*size)--;
1668 (*buf)++;
1669 }
1670 }
1671
1672 #define TMPBUFLEN 22
1673 /**
1674 * proc_get_long - reads an ASCII formatted integer from a user buffer
1675 *
1676 * @buf: a kernel buffer
1677 * @size: size of the kernel buffer
1678 * @val: this is where the number will be stored
1679 * @neg: set to %TRUE if number is negative
1680 * @perm_tr: a vector which contains the allowed trailers
1681 * @perm_tr_len: size of the perm_tr vector
1682 * @tr: pointer to store the trailer character
1683 *
1684 * In case of success %0 is returned and @buf and @size are updated with
1685 * the amount of bytes read. If @tr is non-NULL and a trailing
1686 * character exists (size is non-zero after returning from this
1687 * function), @tr is updated with the trailing character.
1688 */
1689 static int proc_get_long(char **buf, size_t *size,
1690 unsigned long *val, bool *neg,
1691 const char *perm_tr, unsigned perm_tr_len, char *tr)
1692 {
1693 int len;
1694 char *p, tmp[TMPBUFLEN];
1695
1696 if (!*size)
1697 return -EINVAL;
1698
1699 len = *size;
1700 if (len > TMPBUFLEN - 1)
1701 len = TMPBUFLEN - 1;
1702
1703 memcpy(tmp, *buf, len);
1704
1705 tmp[len] = 0;
1706 p = tmp;
1707 if (*p == '-' && *size > 1) {
1708 *neg = true;
1709 p++;
1710 } else
1711 *neg = false;
1712 if (!isdigit(*p))
1713 return -EINVAL;
1714
1715 *val = simple_strtoul(p, &p, 0);
1716
1717 len = p - tmp;
1718
1719 /* We don't know if the next char is whitespace thus we may accept
1720 * invalid integers (e.g. 1234...a) or two integers instead of one
1721 * (e.g. 123...1). So lets not allow such large numbers. */
1722 if (len == TMPBUFLEN - 1)
1723 return -EINVAL;
1724
1725 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1726 return -EINVAL;
1727
1728 if (tr && (len < *size))
1729 *tr = *p;
1730
1731 *buf += len;
1732 *size -= len;
1733
1734 return 0;
1735 }
1736
1737 /**
1738 * proc_put_long - converts an integer to a decimal ASCII formatted string
1739 *
1740 * @buf: the user buffer
1741 * @size: the size of the user buffer
1742 * @val: the integer to be converted
1743 * @neg: sign of the number, %TRUE for negative
1744 *
1745 * In case of success %0 is returned and @buf and @size are updated with
1746 * the amount of bytes written.
1747 */
1748 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1749 bool neg)
1750 {
1751 int len;
1752 char tmp[TMPBUFLEN], *p = tmp;
1753
1754 sprintf(p, "%s%lu", neg ? "-" : "", val);
1755 len = strlen(tmp);
1756 if (len > *size)
1757 len = *size;
1758 if (copy_to_user(*buf, tmp, len))
1759 return -EFAULT;
1760 *size -= len;
1761 *buf += len;
1762 return 0;
1763 }
1764 #undef TMPBUFLEN
1765
1766 static int proc_put_char(void __user **buf, size_t *size, char c)
1767 {
1768 if (*size) {
1769 char __user **buffer = (char __user **)buf;
1770 if (put_user(c, *buffer))
1771 return -EFAULT;
1772 (*size)--, (*buffer)++;
1773 *buf = *buffer;
1774 }
1775 return 0;
1776 }
1777
1778 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1779 int *valp,
1780 int write, void *data)
1781 {
1782 if (write) {
1783 *valp = *negp ? -*lvalp : *lvalp;
1784 } else {
1785 int val = *valp;
1786 if (val < 0) {
1787 *negp = true;
1788 *lvalp = (unsigned long)-val;
1789 } else {
1790 *negp = false;
1791 *lvalp = (unsigned long)val;
1792 }
1793 }
1794 return 0;
1795 }
1796
1797 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1798
1799 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1800 int write, void __user *buffer,
1801 size_t *lenp, loff_t *ppos,
1802 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1803 int write, void *data),
1804 void *data)
1805 {
1806 int *i, vleft, first = 1, err = 0;
1807 unsigned long page = 0;
1808 size_t left;
1809 char *kbuf;
1810
1811 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1812 *lenp = 0;
1813 return 0;
1814 }
1815
1816 i = (int *) tbl_data;
1817 vleft = table->maxlen / sizeof(*i);
1818 left = *lenp;
1819
1820 if (!conv)
1821 conv = do_proc_dointvec_conv;
1822
1823 if (write) {
1824 if (left > PAGE_SIZE - 1)
1825 left = PAGE_SIZE - 1;
1826 page = __get_free_page(GFP_TEMPORARY);
1827 kbuf = (char *) page;
1828 if (!kbuf)
1829 return -ENOMEM;
1830 if (copy_from_user(kbuf, buffer, left)) {
1831 err = -EFAULT;
1832 goto free;
1833 }
1834 kbuf[left] = 0;
1835 }
1836
1837 for (; left && vleft--; i++, first=0) {
1838 unsigned long lval;
1839 bool neg;
1840
1841 if (write) {
1842 left -= proc_skip_spaces(&kbuf);
1843
1844 if (!left)
1845 break;
1846 err = proc_get_long(&kbuf, &left, &lval, &neg,
1847 proc_wspace_sep,
1848 sizeof(proc_wspace_sep), NULL);
1849 if (err)
1850 break;
1851 if (conv(&neg, &lval, i, 1, data)) {
1852 err = -EINVAL;
1853 break;
1854 }
1855 } else {
1856 if (conv(&neg, &lval, i, 0, data)) {
1857 err = -EINVAL;
1858 break;
1859 }
1860 if (!first)
1861 err = proc_put_char(&buffer, &left, '\t');
1862 if (err)
1863 break;
1864 err = proc_put_long(&buffer, &left, lval, neg);
1865 if (err)
1866 break;
1867 }
1868 }
1869
1870 if (!write && !first && left && !err)
1871 err = proc_put_char(&buffer, &left, '\n');
1872 if (write && !err && left)
1873 left -= proc_skip_spaces(&kbuf);
1874 free:
1875 if (write) {
1876 free_page(page);
1877 if (first)
1878 return err ? : -EINVAL;
1879 }
1880 *lenp -= left;
1881 *ppos += *lenp;
1882 return err;
1883 }
1884
1885 static int do_proc_dointvec(struct ctl_table *table, int write,
1886 void __user *buffer, size_t *lenp, loff_t *ppos,
1887 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1888 int write, void *data),
1889 void *data)
1890 {
1891 return __do_proc_dointvec(table->data, table, write,
1892 buffer, lenp, ppos, conv, data);
1893 }
1894
1895 /**
1896 * proc_dointvec - read a vector of integers
1897 * @table: the sysctl table
1898 * @write: %TRUE if this is a write to the sysctl file
1899 * @buffer: the user buffer
1900 * @lenp: the size of the user buffer
1901 * @ppos: file position
1902 *
1903 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1904 * values from/to the user buffer, treated as an ASCII string.
1905 *
1906 * Returns 0 on success.
1907 */
1908 int proc_dointvec(struct ctl_table *table, int write,
1909 void __user *buffer, size_t *lenp, loff_t *ppos)
1910 {
1911 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1912 NULL,NULL);
1913 }
1914
1915 /*
1916 * Taint values can only be increased
1917 * This means we can safely use a temporary.
1918 */
1919 static int proc_taint(struct ctl_table *table, int write,
1920 void __user *buffer, size_t *lenp, loff_t *ppos)
1921 {
1922 struct ctl_table t;
1923 unsigned long tmptaint = get_taint();
1924 int err;
1925
1926 if (write && !capable(CAP_SYS_ADMIN))
1927 return -EPERM;
1928
1929 t = *table;
1930 t.data = &tmptaint;
1931 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1932 if (err < 0)
1933 return err;
1934
1935 if (write) {
1936 /*
1937 * Poor man's atomic or. Not worth adding a primitive
1938 * to everyone's atomic.h for this
1939 */
1940 int i;
1941 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1942 if ((tmptaint >> i) & 1)
1943 add_taint(i);
1944 }
1945 }
1946
1947 return err;
1948 }
1949
1950 #ifdef CONFIG_PRINTK
1951 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1952 void __user *buffer, size_t *lenp, loff_t *ppos)
1953 {
1954 if (write && !capable(CAP_SYS_ADMIN))
1955 return -EPERM;
1956
1957 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1958 }
1959 #endif
1960
1961 struct do_proc_dointvec_minmax_conv_param {
1962 int *min;
1963 int *max;
1964 };
1965
1966 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1967 int *valp,
1968 int write, void *data)
1969 {
1970 struct do_proc_dointvec_minmax_conv_param *param = data;
1971 if (write) {
1972 int val = *negp ? -*lvalp : *lvalp;
1973 if ((param->min && *param->min > val) ||
1974 (param->max && *param->max < val))
1975 return -EINVAL;
1976 *valp = val;
1977 } else {
1978 int val = *valp;
1979 if (val < 0) {
1980 *negp = true;
1981 *lvalp = (unsigned long)-val;
1982 } else {
1983 *negp = false;
1984 *lvalp = (unsigned long)val;
1985 }
1986 }
1987 return 0;
1988 }
1989
1990 /**
1991 * proc_dointvec_minmax - read a vector of integers with min/max values
1992 * @table: the sysctl table
1993 * @write: %TRUE if this is a write to the sysctl file
1994 * @buffer: the user buffer
1995 * @lenp: the size of the user buffer
1996 * @ppos: file position
1997 *
1998 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1999 * values from/to the user buffer, treated as an ASCII string.
2000 *
2001 * This routine will ensure the values are within the range specified by
2002 * table->extra1 (min) and table->extra2 (max).
2003 *
2004 * Returns 0 on success.
2005 */
2006 int proc_dointvec_minmax(struct ctl_table *table, int write,
2007 void __user *buffer, size_t *lenp, loff_t *ppos)
2008 {
2009 struct do_proc_dointvec_minmax_conv_param param = {
2010 .min = (int *) table->extra1,
2011 .max = (int *) table->extra2,
2012 };
2013 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2014 do_proc_dointvec_minmax_conv, &param);
2015 }
2016
2017 static void validate_coredump_safety(void)
2018 {
2019 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2020 core_pattern[0] != '/' && core_pattern[0] != '|') {
2021 printk(KERN_WARNING "Unsafe core_pattern used with "\
2022 "suid_dumpable=2. Pipe handler or fully qualified "\
2023 "core dump path required.\n");
2024 }
2025 }
2026
2027 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2028 void __user *buffer, size_t *lenp, loff_t *ppos)
2029 {
2030 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2031 if (!error)
2032 validate_coredump_safety();
2033 return error;
2034 }
2035
2036 static int proc_dostring_coredump(struct ctl_table *table, int write,
2037 void __user *buffer, size_t *lenp, loff_t *ppos)
2038 {
2039 int error = proc_dostring(table, write, buffer, lenp, ppos);
2040 if (!error)
2041 validate_coredump_safety();
2042 return error;
2043 }
2044
2045 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2046 void __user *buffer,
2047 size_t *lenp, loff_t *ppos,
2048 unsigned long convmul,
2049 unsigned long convdiv)
2050 {
2051 unsigned long *i, *min, *max;
2052 int vleft, first = 1, err = 0;
2053 unsigned long page = 0;
2054 size_t left;
2055 char *kbuf;
2056
2057 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2058 *lenp = 0;
2059 return 0;
2060 }
2061
2062 i = (unsigned long *) data;
2063 min = (unsigned long *) table->extra1;
2064 max = (unsigned long *) table->extra2;
2065 vleft = table->maxlen / sizeof(unsigned long);
2066 left = *lenp;
2067
2068 if (write) {
2069 if (left > PAGE_SIZE - 1)
2070 left = PAGE_SIZE - 1;
2071 page = __get_free_page(GFP_TEMPORARY);
2072 kbuf = (char *) page;
2073 if (!kbuf)
2074 return -ENOMEM;
2075 if (copy_from_user(kbuf, buffer, left)) {
2076 err = -EFAULT;
2077 goto free;
2078 }
2079 kbuf[left] = 0;
2080 }
2081
2082 for (; left && vleft--; i++, first = 0) {
2083 unsigned long val;
2084
2085 if (write) {
2086 bool neg;
2087
2088 left -= proc_skip_spaces(&kbuf);
2089
2090 err = proc_get_long(&kbuf, &left, &val, &neg,
2091 proc_wspace_sep,
2092 sizeof(proc_wspace_sep), NULL);
2093 if (err)
2094 break;
2095 if (neg)
2096 continue;
2097 if ((min && val < *min) || (max && val > *max))
2098 continue;
2099 *i = val;
2100 } else {
2101 val = convdiv * (*i) / convmul;
2102 if (!first)
2103 err = proc_put_char(&buffer, &left, '\t');
2104 err = proc_put_long(&buffer, &left, val, false);
2105 if (err)
2106 break;
2107 }
2108 }
2109
2110 if (!write && !first && left && !err)
2111 err = proc_put_char(&buffer, &left, '\n');
2112 if (write && !err)
2113 left -= proc_skip_spaces(&kbuf);
2114 free:
2115 if (write) {
2116 free_page(page);
2117 if (first)
2118 return err ? : -EINVAL;
2119 }
2120 *lenp -= left;
2121 *ppos += *lenp;
2122 return err;
2123 }
2124
2125 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2126 void __user *buffer,
2127 size_t *lenp, loff_t *ppos,
2128 unsigned long convmul,
2129 unsigned long convdiv)
2130 {
2131 return __do_proc_doulongvec_minmax(table->data, table, write,
2132 buffer, lenp, ppos, convmul, convdiv);
2133 }
2134
2135 /**
2136 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2137 * @table: the sysctl table
2138 * @write: %TRUE if this is a write to the sysctl file
2139 * @buffer: the user buffer
2140 * @lenp: the size of the user buffer
2141 * @ppos: file position
2142 *
2143 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2144 * values from/to the user buffer, treated as an ASCII string.
2145 *
2146 * This routine will ensure the values are within the range specified by
2147 * table->extra1 (min) and table->extra2 (max).
2148 *
2149 * Returns 0 on success.
2150 */
2151 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2152 void __user *buffer, size_t *lenp, loff_t *ppos)
2153 {
2154 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2155 }
2156
2157 /**
2158 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2159 * @table: the sysctl table
2160 * @write: %TRUE if this is a write to the sysctl file
2161 * @buffer: the user buffer
2162 * @lenp: the size of the user buffer
2163 * @ppos: file position
2164 *
2165 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2166 * values from/to the user buffer, treated as an ASCII string. The values
2167 * are treated as milliseconds, and converted to jiffies when they are stored.
2168 *
2169 * This routine will ensure the values are within the range specified by
2170 * table->extra1 (min) and table->extra2 (max).
2171 *
2172 * Returns 0 on success.
2173 */
2174 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2175 void __user *buffer,
2176 size_t *lenp, loff_t *ppos)
2177 {
2178 return do_proc_doulongvec_minmax(table, write, buffer,
2179 lenp, ppos, HZ, 1000l);
2180 }
2181
2182
2183 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2184 int *valp,
2185 int write, void *data)
2186 {
2187 if (write) {
2188 if (*lvalp > LONG_MAX / HZ)
2189 return 1;
2190 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2191 } else {
2192 int val = *valp;
2193 unsigned long lval;
2194 if (val < 0) {
2195 *negp = true;
2196 lval = (unsigned long)-val;
2197 } else {
2198 *negp = false;
2199 lval = (unsigned long)val;
2200 }
2201 *lvalp = lval / HZ;
2202 }
2203 return 0;
2204 }
2205
2206 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2207 int *valp,
2208 int write, void *data)
2209 {
2210 if (write) {
2211 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2212 return 1;
2213 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2214 } else {
2215 int val = *valp;
2216 unsigned long lval;
2217 if (val < 0) {
2218 *negp = true;
2219 lval = (unsigned long)-val;
2220 } else {
2221 *negp = false;
2222 lval = (unsigned long)val;
2223 }
2224 *lvalp = jiffies_to_clock_t(lval);
2225 }
2226 return 0;
2227 }
2228
2229 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2230 int *valp,
2231 int write, void *data)
2232 {
2233 if (write) {
2234 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2235 } else {
2236 int val = *valp;
2237 unsigned long lval;
2238 if (val < 0) {
2239 *negp = true;
2240 lval = (unsigned long)-val;
2241 } else {
2242 *negp = false;
2243 lval = (unsigned long)val;
2244 }
2245 *lvalp = jiffies_to_msecs(lval);
2246 }
2247 return 0;
2248 }
2249
2250 /**
2251 * proc_dointvec_jiffies - read a vector of integers as seconds
2252 * @table: the sysctl table
2253 * @write: %TRUE if this is a write to the sysctl file
2254 * @buffer: the user buffer
2255 * @lenp: the size of the user buffer
2256 * @ppos: file position
2257 *
2258 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2259 * values from/to the user buffer, treated as an ASCII string.
2260 * The values read are assumed to be in seconds, and are converted into
2261 * jiffies.
2262 *
2263 * Returns 0 on success.
2264 */
2265 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2266 void __user *buffer, size_t *lenp, loff_t *ppos)
2267 {
2268 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2269 do_proc_dointvec_jiffies_conv,NULL);
2270 }
2271
2272 /**
2273 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2274 * @table: the sysctl table
2275 * @write: %TRUE if this is a write to the sysctl file
2276 * @buffer: the user buffer
2277 * @lenp: the size of the user buffer
2278 * @ppos: pointer to the file position
2279 *
2280 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2281 * values from/to the user buffer, treated as an ASCII string.
2282 * The values read are assumed to be in 1/USER_HZ seconds, and
2283 * are converted into jiffies.
2284 *
2285 * Returns 0 on success.
2286 */
2287 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2288 void __user *buffer, size_t *lenp, loff_t *ppos)
2289 {
2290 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2291 do_proc_dointvec_userhz_jiffies_conv,NULL);
2292 }
2293
2294 /**
2295 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2296 * @table: the sysctl table
2297 * @write: %TRUE if this is a write to the sysctl file
2298 * @buffer: the user buffer
2299 * @lenp: the size of the user buffer
2300 * @ppos: file position
2301 * @ppos: the current position in the file
2302 *
2303 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2304 * values from/to the user buffer, treated as an ASCII string.
2305 * The values read are assumed to be in 1/1000 seconds, and
2306 * are converted into jiffies.
2307 *
2308 * Returns 0 on success.
2309 */
2310 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2311 void __user *buffer, size_t *lenp, loff_t *ppos)
2312 {
2313 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2314 do_proc_dointvec_ms_jiffies_conv, NULL);
2315 }
2316
2317 static int proc_do_cad_pid(struct ctl_table *table, int write,
2318 void __user *buffer, size_t *lenp, loff_t *ppos)
2319 {
2320 struct pid *new_pid;
2321 pid_t tmp;
2322 int r;
2323
2324 tmp = pid_vnr(cad_pid);
2325
2326 r = __do_proc_dointvec(&tmp, table, write, buffer,
2327 lenp, ppos, NULL, NULL);
2328 if (r || !write)
2329 return r;
2330
2331 new_pid = find_get_pid(tmp);
2332 if (!new_pid)
2333 return -ESRCH;
2334
2335 put_pid(xchg(&cad_pid, new_pid));
2336 return 0;
2337 }
2338
2339 /**
2340 * proc_do_large_bitmap - read/write from/to a large bitmap
2341 * @table: the sysctl table
2342 * @write: %TRUE if this is a write to the sysctl file
2343 * @buffer: the user buffer
2344 * @lenp: the size of the user buffer
2345 * @ppos: file position
2346 *
2347 * The bitmap is stored at table->data and the bitmap length (in bits)
2348 * in table->maxlen.
2349 *
2350 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2351 * large bitmaps may be represented in a compact manner. Writing into
2352 * the file will clear the bitmap then update it with the given input.
2353 *
2354 * Returns 0 on success.
2355 */
2356 int proc_do_large_bitmap(struct ctl_table *table, int write,
2357 void __user *buffer, size_t *lenp, loff_t *ppos)
2358 {
2359 int err = 0;
2360 bool first = 1;
2361 size_t left = *lenp;
2362 unsigned long bitmap_len = table->maxlen;
2363 unsigned long *bitmap = (unsigned long *) table->data;
2364 unsigned long *tmp_bitmap = NULL;
2365 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2366
2367 if (!bitmap_len || !left || (*ppos && !write)) {
2368 *lenp = 0;
2369 return 0;
2370 }
2371
2372 if (write) {
2373 unsigned long page = 0;
2374 char *kbuf;
2375
2376 if (left > PAGE_SIZE - 1)
2377 left = PAGE_SIZE - 1;
2378
2379 page = __get_free_page(GFP_TEMPORARY);
2380 kbuf = (char *) page;
2381 if (!kbuf)
2382 return -ENOMEM;
2383 if (copy_from_user(kbuf, buffer, left)) {
2384 free_page(page);
2385 return -EFAULT;
2386 }
2387 kbuf[left] = 0;
2388
2389 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2390 GFP_KERNEL);
2391 if (!tmp_bitmap) {
2392 free_page(page);
2393 return -ENOMEM;
2394 }
2395 proc_skip_char(&kbuf, &left, '\n');
2396 while (!err && left) {
2397 unsigned long val_a, val_b;
2398 bool neg;
2399
2400 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2401 sizeof(tr_a), &c);
2402 if (err)
2403 break;
2404 if (val_a >= bitmap_len || neg) {
2405 err = -EINVAL;
2406 break;
2407 }
2408
2409 val_b = val_a;
2410 if (left) {
2411 kbuf++;
2412 left--;
2413 }
2414
2415 if (c == '-') {
2416 err = proc_get_long(&kbuf, &left, &val_b,
2417 &neg, tr_b, sizeof(tr_b),
2418 &c);
2419 if (err)
2420 break;
2421 if (val_b >= bitmap_len || neg ||
2422 val_a > val_b) {
2423 err = -EINVAL;
2424 break;
2425 }
2426 if (left) {
2427 kbuf++;
2428 left--;
2429 }
2430 }
2431
2432 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2433 first = 0;
2434 proc_skip_char(&kbuf, &left, '\n');
2435 }
2436 free_page(page);
2437 } else {
2438 unsigned long bit_a, bit_b = 0;
2439
2440 while (left) {
2441 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2442 if (bit_a >= bitmap_len)
2443 break;
2444 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2445 bit_a + 1) - 1;
2446
2447 if (!first) {
2448 err = proc_put_char(&buffer, &left, ',');
2449 if (err)
2450 break;
2451 }
2452 err = proc_put_long(&buffer, &left, bit_a, false);
2453 if (err)
2454 break;
2455 if (bit_a != bit_b) {
2456 err = proc_put_char(&buffer, &left, '-');
2457 if (err)
2458 break;
2459 err = proc_put_long(&buffer, &left, bit_b, false);
2460 if (err)
2461 break;
2462 }
2463
2464 first = 0; bit_b++;
2465 }
2466 if (!err)
2467 err = proc_put_char(&buffer, &left, '\n');
2468 }
2469
2470 if (!err) {
2471 if (write) {
2472 if (*ppos)
2473 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2474 else
2475 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2476 }
2477 kfree(tmp_bitmap);
2478 *lenp -= left;
2479 *ppos += *lenp;
2480 return 0;
2481 } else {
2482 kfree(tmp_bitmap);
2483 return err;
2484 }
2485 }
2486
2487 #else /* CONFIG_PROC_SYSCTL */
2488
2489 int proc_dostring(struct ctl_table *table, int write,
2490 void __user *buffer, size_t *lenp, loff_t *ppos)
2491 {
2492 return -ENOSYS;
2493 }
2494
2495 int proc_dointvec(struct ctl_table *table, int write,
2496 void __user *buffer, size_t *lenp, loff_t *ppos)
2497 {
2498 return -ENOSYS;
2499 }
2500
2501 int proc_dointvec_minmax(struct ctl_table *table, int write,
2502 void __user *buffer, size_t *lenp, loff_t *ppos)
2503 {
2504 return -ENOSYS;
2505 }
2506
2507 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2508 void __user *buffer, size_t *lenp, loff_t *ppos)
2509 {
2510 return -ENOSYS;
2511 }
2512
2513 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2514 void __user *buffer, size_t *lenp, loff_t *ppos)
2515 {
2516 return -ENOSYS;
2517 }
2518
2519 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2520 void __user *buffer, size_t *lenp, loff_t *ppos)
2521 {
2522 return -ENOSYS;
2523 }
2524
2525 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2526 void __user *buffer, size_t *lenp, loff_t *ppos)
2527 {
2528 return -ENOSYS;
2529 }
2530
2531 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2532 void __user *buffer,
2533 size_t *lenp, loff_t *ppos)
2534 {
2535 return -ENOSYS;
2536 }
2537
2538
2539 #endif /* CONFIG_PROC_SYSCTL */
2540
2541 /*
2542 * No sense putting this after each symbol definition, twice,
2543 * exception granted :-)
2544 */
2545 EXPORT_SYMBOL(proc_dointvec);
2546 EXPORT_SYMBOL(proc_dointvec_jiffies);
2547 EXPORT_SYMBOL(proc_dointvec_minmax);
2548 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2549 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2550 EXPORT_SYMBOL(proc_dostring);
2551 EXPORT_SYMBOL(proc_doulongvec_minmax);
2552 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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