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Merge branch 'sh/cpufreq' into sh-latest
[deliverable/linux.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/signal.h>
27 #include <linux/printk.h>
28 #include <linux/proc_fs.h>
29 #include <linux/security.h>
30 #include <linux/ctype.h>
31 #include <linux/kmemcheck.h>
32 #include <linux/fs.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/ratelimit.h>
41 #include <linux/compaction.h>
42 #include <linux/hugetlb.h>
43 #include <linux/initrd.h>
44 #include <linux/key.h>
45 #include <linux/times.h>
46 #include <linux/limits.h>
47 #include <linux/dcache.h>
48 #include <linux/dnotify.h>
49 #include <linux/syscalls.h>
50 #include <linux/vmstat.h>
51 #include <linux/nfs_fs.h>
52 #include <linux/acpi.h>
53 #include <linux/reboot.h>
54 #include <linux/ftrace.h>
55 #include <linux/perf_event.h>
56 #include <linux/kprobes.h>
57 #include <linux/pipe_fs_i.h>
58 #include <linux/oom.h>
59 #include <linux/kmod.h>
60 #include <linux/capability.h>
61 #include <linux/binfmts.h>
62
63 #include <asm/uaccess.h>
64 #include <asm/processor.h>
65
66 #ifdef CONFIG_X86
67 #include <asm/nmi.h>
68 #include <asm/stacktrace.h>
69 #include <asm/io.h>
70 #endif
71 #ifdef CONFIG_BSD_PROCESS_ACCT
72 #include <linux/acct.h>
73 #endif
74 #ifdef CONFIG_RT_MUTEXES
75 #include <linux/rtmutex.h>
76 #endif
77 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
78 #include <linux/lockdep.h>
79 #endif
80 #ifdef CONFIG_CHR_DEV_SG
81 #include <scsi/sg.h>
82 #endif
83
84 #ifdef CONFIG_LOCKUP_DETECTOR
85 #include <linux/nmi.h>
86 #endif
87
88
89 #if defined(CONFIG_SYSCTL)
90
91 /* External variables not in a header file. */
92 extern int sysctl_overcommit_memory;
93 extern int sysctl_overcommit_ratio;
94 extern int max_threads;
95 extern int core_uses_pid;
96 extern int suid_dumpable;
97 extern char core_pattern[];
98 extern unsigned int core_pipe_limit;
99 extern int pid_max;
100 extern int min_free_kbytes;
101 extern int pid_max_min, pid_max_max;
102 extern int sysctl_drop_caches;
103 extern int percpu_pagelist_fraction;
104 extern int compat_log;
105 extern int latencytop_enabled;
106 extern int sysctl_nr_open_min, sysctl_nr_open_max;
107 #ifndef CONFIG_MMU
108 extern int sysctl_nr_trim_pages;
109 #endif
110 #ifdef CONFIG_BLOCK
111 extern int blk_iopoll_enabled;
112 #endif
113
114 /* Constants used for minimum and maximum */
115 #ifdef CONFIG_LOCKUP_DETECTOR
116 static int sixty = 60;
117 static int neg_one = -1;
118 #endif
119
120 static int zero;
121 static int __maybe_unused one = 1;
122 static int __maybe_unused two = 2;
123 static int __maybe_unused three = 3;
124 static unsigned long one_ul = 1;
125 static int one_hundred = 100;
126 #ifdef CONFIG_PRINTK
127 static int ten_thousand = 10000;
128 #endif
129
130 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
131 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
132
133 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
134 static int maxolduid = 65535;
135 static int minolduid;
136 static int min_percpu_pagelist_fract = 8;
137
138 static int ngroups_max = NGROUPS_MAX;
139 static const int cap_last_cap = CAP_LAST_CAP;
140
141 #ifdef CONFIG_INOTIFY_USER
142 #include <linux/inotify.h>
143 #endif
144 #ifdef CONFIG_SPARC
145 #include <asm/system.h>
146 #endif
147
148 #ifdef CONFIG_SPARC64
149 extern int sysctl_tsb_ratio;
150 #endif
151
152 #ifdef __hppa__
153 extern int pwrsw_enabled;
154 extern int unaligned_enabled;
155 #endif
156
157 #ifdef CONFIG_IA64
158 extern int no_unaligned_warning;
159 extern int unaligned_dump_stack;
160 #endif
161
162 #ifdef CONFIG_PROC_SYSCTL
163 static int proc_do_cad_pid(struct ctl_table *table, int write,
164 void __user *buffer, size_t *lenp, loff_t *ppos);
165 static int proc_taint(struct ctl_table *table, int write,
166 void __user *buffer, size_t *lenp, loff_t *ppos);
167 #endif
168
169 #ifdef CONFIG_PRINTK
170 static int proc_dmesg_restrict(struct ctl_table *table, int write,
171 void __user *buffer, size_t *lenp, loff_t *ppos);
172 #endif
173
174 #ifdef CONFIG_MAGIC_SYSRQ
175 /* Note: sysrq code uses it's own private copy */
176 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
177
178 static int sysrq_sysctl_handler(ctl_table *table, int write,
179 void __user *buffer, size_t *lenp,
180 loff_t *ppos)
181 {
182 int error;
183
184 error = proc_dointvec(table, write, buffer, lenp, ppos);
185 if (error)
186 return error;
187
188 if (write)
189 sysrq_toggle_support(__sysrq_enabled);
190
191 return 0;
192 }
193
194 #endif
195
196 static struct ctl_table kern_table[];
197 static struct ctl_table vm_table[];
198 static struct ctl_table fs_table[];
199 static struct ctl_table debug_table[];
200 static struct ctl_table dev_table[];
201 extern struct ctl_table random_table[];
202 #ifdef CONFIG_EPOLL
203 extern struct ctl_table epoll_table[];
204 #endif
205
206 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
207 int sysctl_legacy_va_layout;
208 #endif
209
210 /* The default sysctl tables: */
211
212 static struct ctl_table sysctl_base_table[] = {
213 {
214 .procname = "kernel",
215 .mode = 0555,
216 .child = kern_table,
217 },
218 {
219 .procname = "vm",
220 .mode = 0555,
221 .child = vm_table,
222 },
223 {
224 .procname = "fs",
225 .mode = 0555,
226 .child = fs_table,
227 },
228 {
229 .procname = "debug",
230 .mode = 0555,
231 .child = debug_table,
232 },
233 {
234 .procname = "dev",
235 .mode = 0555,
236 .child = dev_table,
237 },
238 { }
239 };
240
241 #ifdef CONFIG_SCHED_DEBUG
242 static int min_sched_granularity_ns = 100000; /* 100 usecs */
243 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
244 static int min_wakeup_granularity_ns; /* 0 usecs */
245 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
246 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
247 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
248 #endif
249
250 #ifdef CONFIG_COMPACTION
251 static int min_extfrag_threshold;
252 static int max_extfrag_threshold = 1000;
253 #endif
254
255 static struct ctl_table kern_table[] = {
256 {
257 .procname = "sched_child_runs_first",
258 .data = &sysctl_sched_child_runs_first,
259 .maxlen = sizeof(unsigned int),
260 .mode = 0644,
261 .proc_handler = proc_dointvec,
262 },
263 #ifdef CONFIG_SCHED_DEBUG
264 {
265 .procname = "sched_min_granularity_ns",
266 .data = &sysctl_sched_min_granularity,
267 .maxlen = sizeof(unsigned int),
268 .mode = 0644,
269 .proc_handler = sched_proc_update_handler,
270 .extra1 = &min_sched_granularity_ns,
271 .extra2 = &max_sched_granularity_ns,
272 },
273 {
274 .procname = "sched_latency_ns",
275 .data = &sysctl_sched_latency,
276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
278 .proc_handler = sched_proc_update_handler,
279 .extra1 = &min_sched_granularity_ns,
280 .extra2 = &max_sched_granularity_ns,
281 },
282 {
283 .procname = "sched_wakeup_granularity_ns",
284 .data = &sysctl_sched_wakeup_granularity,
285 .maxlen = sizeof(unsigned int),
286 .mode = 0644,
287 .proc_handler = sched_proc_update_handler,
288 .extra1 = &min_wakeup_granularity_ns,
289 .extra2 = &max_wakeup_granularity_ns,
290 },
291 {
292 .procname = "sched_tunable_scaling",
293 .data = &sysctl_sched_tunable_scaling,
294 .maxlen = sizeof(enum sched_tunable_scaling),
295 .mode = 0644,
296 .proc_handler = sched_proc_update_handler,
297 .extra1 = &min_sched_tunable_scaling,
298 .extra2 = &max_sched_tunable_scaling,
299 },
300 {
301 .procname = "sched_migration_cost",
302 .data = &sysctl_sched_migration_cost,
303 .maxlen = sizeof(unsigned int),
304 .mode = 0644,
305 .proc_handler = proc_dointvec,
306 },
307 {
308 .procname = "sched_nr_migrate",
309 .data = &sysctl_sched_nr_migrate,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = proc_dointvec,
313 },
314 {
315 .procname = "sched_time_avg",
316 .data = &sysctl_sched_time_avg,
317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
319 .proc_handler = proc_dointvec,
320 },
321 {
322 .procname = "sched_shares_window",
323 .data = &sysctl_sched_shares_window,
324 .maxlen = sizeof(unsigned int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec,
327 },
328 {
329 .procname = "timer_migration",
330 .data = &sysctl_timer_migration,
331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
333 .proc_handler = proc_dointvec_minmax,
334 .extra1 = &zero,
335 .extra2 = &one,
336 },
337 #endif
338 {
339 .procname = "sched_rt_period_us",
340 .data = &sysctl_sched_rt_period,
341 .maxlen = sizeof(unsigned int),
342 .mode = 0644,
343 .proc_handler = sched_rt_handler,
344 },
345 {
346 .procname = "sched_rt_runtime_us",
347 .data = &sysctl_sched_rt_runtime,
348 .maxlen = sizeof(int),
349 .mode = 0644,
350 .proc_handler = sched_rt_handler,
351 },
352 #ifdef CONFIG_SCHED_AUTOGROUP
353 {
354 .procname = "sched_autogroup_enabled",
355 .data = &sysctl_sched_autogroup_enabled,
356 .maxlen = sizeof(unsigned int),
357 .mode = 0644,
358 .proc_handler = proc_dointvec_minmax,
359 .extra1 = &zero,
360 .extra2 = &one,
361 },
362 #endif
363 #ifdef CONFIG_CFS_BANDWIDTH
364 {
365 .procname = "sched_cfs_bandwidth_slice_us",
366 .data = &sysctl_sched_cfs_bandwidth_slice,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec_minmax,
370 .extra1 = &one,
371 },
372 #endif
373 #ifdef CONFIG_PROVE_LOCKING
374 {
375 .procname = "prove_locking",
376 .data = &prove_locking,
377 .maxlen = sizeof(int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec,
380 },
381 #endif
382 #ifdef CONFIG_LOCK_STAT
383 {
384 .procname = "lock_stat",
385 .data = &lock_stat,
386 .maxlen = sizeof(int),
387 .mode = 0644,
388 .proc_handler = proc_dointvec,
389 },
390 #endif
391 {
392 .procname = "panic",
393 .data = &panic_timeout,
394 .maxlen = sizeof(int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec,
397 },
398 {
399 .procname = "core_uses_pid",
400 .data = &core_uses_pid,
401 .maxlen = sizeof(int),
402 .mode = 0644,
403 .proc_handler = proc_dointvec,
404 },
405 {
406 .procname = "core_pattern",
407 .data = core_pattern,
408 .maxlen = CORENAME_MAX_SIZE,
409 .mode = 0644,
410 .proc_handler = proc_dostring,
411 },
412 {
413 .procname = "core_pipe_limit",
414 .data = &core_pipe_limit,
415 .maxlen = sizeof(unsigned int),
416 .mode = 0644,
417 .proc_handler = proc_dointvec,
418 },
419 #ifdef CONFIG_PROC_SYSCTL
420 {
421 .procname = "tainted",
422 .maxlen = sizeof(long),
423 .mode = 0644,
424 .proc_handler = proc_taint,
425 },
426 #endif
427 #ifdef CONFIG_LATENCYTOP
428 {
429 .procname = "latencytop",
430 .data = &latencytop_enabled,
431 .maxlen = sizeof(int),
432 .mode = 0644,
433 .proc_handler = proc_dointvec,
434 },
435 #endif
436 #ifdef CONFIG_BLK_DEV_INITRD
437 {
438 .procname = "real-root-dev",
439 .data = &real_root_dev,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec,
443 },
444 #endif
445 {
446 .procname = "print-fatal-signals",
447 .data = &print_fatal_signals,
448 .maxlen = sizeof(int),
449 .mode = 0644,
450 .proc_handler = proc_dointvec,
451 },
452 #ifdef CONFIG_SPARC
453 {
454 .procname = "reboot-cmd",
455 .data = reboot_command,
456 .maxlen = 256,
457 .mode = 0644,
458 .proc_handler = proc_dostring,
459 },
460 {
461 .procname = "stop-a",
462 .data = &stop_a_enabled,
463 .maxlen = sizeof (int),
464 .mode = 0644,
465 .proc_handler = proc_dointvec,
466 },
467 {
468 .procname = "scons-poweroff",
469 .data = &scons_pwroff,
470 .maxlen = sizeof (int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec,
473 },
474 #endif
475 #ifdef CONFIG_SPARC64
476 {
477 .procname = "tsb-ratio",
478 .data = &sysctl_tsb_ratio,
479 .maxlen = sizeof (int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 #endif
484 #ifdef __hppa__
485 {
486 .procname = "soft-power",
487 .data = &pwrsw_enabled,
488 .maxlen = sizeof (int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 {
493 .procname = "unaligned-trap",
494 .data = &unaligned_enabled,
495 .maxlen = sizeof (int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec,
498 },
499 #endif
500 {
501 .procname = "ctrl-alt-del",
502 .data = &C_A_D,
503 .maxlen = sizeof(int),
504 .mode = 0644,
505 .proc_handler = proc_dointvec,
506 },
507 #ifdef CONFIG_FUNCTION_TRACER
508 {
509 .procname = "ftrace_enabled",
510 .data = &ftrace_enabled,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = ftrace_enable_sysctl,
514 },
515 #endif
516 #ifdef CONFIG_STACK_TRACER
517 {
518 .procname = "stack_tracer_enabled",
519 .data = &stack_tracer_enabled,
520 .maxlen = sizeof(int),
521 .mode = 0644,
522 .proc_handler = stack_trace_sysctl,
523 },
524 #endif
525 #ifdef CONFIG_TRACING
526 {
527 .procname = "ftrace_dump_on_oops",
528 .data = &ftrace_dump_on_oops,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = proc_dointvec,
532 },
533 #endif
534 #ifdef CONFIG_MODULES
535 {
536 .procname = "modprobe",
537 .data = &modprobe_path,
538 .maxlen = KMOD_PATH_LEN,
539 .mode = 0644,
540 .proc_handler = proc_dostring,
541 },
542 {
543 .procname = "modules_disabled",
544 .data = &modules_disabled,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 /* only handle a transition from default "0" to "1" */
548 .proc_handler = proc_dointvec_minmax,
549 .extra1 = &one,
550 .extra2 = &one,
551 },
552 #endif
553 #ifdef CONFIG_HOTPLUG
554 {
555 .procname = "hotplug",
556 .data = &uevent_helper,
557 .maxlen = UEVENT_HELPER_PATH_LEN,
558 .mode = 0644,
559 .proc_handler = proc_dostring,
560 },
561 #endif
562 #ifdef CONFIG_CHR_DEV_SG
563 {
564 .procname = "sg-big-buff",
565 .data = &sg_big_buff,
566 .maxlen = sizeof (int),
567 .mode = 0444,
568 .proc_handler = proc_dointvec,
569 },
570 #endif
571 #ifdef CONFIG_BSD_PROCESS_ACCT
572 {
573 .procname = "acct",
574 .data = &acct_parm,
575 .maxlen = 3*sizeof(int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec,
578 },
579 #endif
580 #ifdef CONFIG_MAGIC_SYSRQ
581 {
582 .procname = "sysrq",
583 .data = &__sysrq_enabled,
584 .maxlen = sizeof (int),
585 .mode = 0644,
586 .proc_handler = sysrq_sysctl_handler,
587 },
588 #endif
589 #ifdef CONFIG_PROC_SYSCTL
590 {
591 .procname = "cad_pid",
592 .data = NULL,
593 .maxlen = sizeof (int),
594 .mode = 0600,
595 .proc_handler = proc_do_cad_pid,
596 },
597 #endif
598 {
599 .procname = "threads-max",
600 .data = &max_threads,
601 .maxlen = sizeof(int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec,
604 },
605 {
606 .procname = "random",
607 .mode = 0555,
608 .child = random_table,
609 },
610 {
611 .procname = "usermodehelper",
612 .mode = 0555,
613 .child = usermodehelper_table,
614 },
615 {
616 .procname = "overflowuid",
617 .data = &overflowuid,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec_minmax,
621 .extra1 = &minolduid,
622 .extra2 = &maxolduid,
623 },
624 {
625 .procname = "overflowgid",
626 .data = &overflowgid,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec_minmax,
630 .extra1 = &minolduid,
631 .extra2 = &maxolduid,
632 },
633 #ifdef CONFIG_S390
634 #ifdef CONFIG_MATHEMU
635 {
636 .procname = "ieee_emulation_warnings",
637 .data = &sysctl_ieee_emulation_warnings,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec,
641 },
642 #endif
643 {
644 .procname = "userprocess_debug",
645 .data = &show_unhandled_signals,
646 .maxlen = sizeof(int),
647 .mode = 0644,
648 .proc_handler = proc_dointvec,
649 },
650 #endif
651 {
652 .procname = "pid_max",
653 .data = &pid_max,
654 .maxlen = sizeof (int),
655 .mode = 0644,
656 .proc_handler = proc_dointvec_minmax,
657 .extra1 = &pid_max_min,
658 .extra2 = &pid_max_max,
659 },
660 {
661 .procname = "panic_on_oops",
662 .data = &panic_on_oops,
663 .maxlen = sizeof(int),
664 .mode = 0644,
665 .proc_handler = proc_dointvec,
666 },
667 #if defined CONFIG_PRINTK
668 {
669 .procname = "printk",
670 .data = &console_loglevel,
671 .maxlen = 4*sizeof(int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec,
674 },
675 {
676 .procname = "printk_ratelimit",
677 .data = &printk_ratelimit_state.interval,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec_jiffies,
681 },
682 {
683 .procname = "printk_ratelimit_burst",
684 .data = &printk_ratelimit_state.burst,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec,
688 },
689 {
690 .procname = "printk_delay",
691 .data = &printk_delay_msec,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec_minmax,
695 .extra1 = &zero,
696 .extra2 = &ten_thousand,
697 },
698 {
699 .procname = "dmesg_restrict",
700 .data = &dmesg_restrict,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = proc_dointvec_minmax,
704 .extra1 = &zero,
705 .extra2 = &one,
706 },
707 {
708 .procname = "kptr_restrict",
709 .data = &kptr_restrict,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = proc_dmesg_restrict,
713 .extra1 = &zero,
714 .extra2 = &two,
715 },
716 #endif
717 {
718 .procname = "ngroups_max",
719 .data = &ngroups_max,
720 .maxlen = sizeof (int),
721 .mode = 0444,
722 .proc_handler = proc_dointvec,
723 },
724 {
725 .procname = "cap_last_cap",
726 .data = (void *)&cap_last_cap,
727 .maxlen = sizeof(int),
728 .mode = 0444,
729 .proc_handler = proc_dointvec,
730 },
731 #if defined(CONFIG_LOCKUP_DETECTOR)
732 {
733 .procname = "watchdog",
734 .data = &watchdog_enabled,
735 .maxlen = sizeof (int),
736 .mode = 0644,
737 .proc_handler = proc_dowatchdog,
738 .extra1 = &zero,
739 .extra2 = &one,
740 },
741 {
742 .procname = "watchdog_thresh",
743 .data = &watchdog_thresh,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = proc_dowatchdog,
747 .extra1 = &neg_one,
748 .extra2 = &sixty,
749 },
750 {
751 .procname = "softlockup_panic",
752 .data = &softlockup_panic,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec_minmax,
756 .extra1 = &zero,
757 .extra2 = &one,
758 },
759 {
760 .procname = "nmi_watchdog",
761 .data = &watchdog_enabled,
762 .maxlen = sizeof (int),
763 .mode = 0644,
764 .proc_handler = proc_dowatchdog,
765 .extra1 = &zero,
766 .extra2 = &one,
767 },
768 #endif
769 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
770 {
771 .procname = "unknown_nmi_panic",
772 .data = &unknown_nmi_panic,
773 .maxlen = sizeof (int),
774 .mode = 0644,
775 .proc_handler = proc_dointvec,
776 },
777 #endif
778 #if defined(CONFIG_X86)
779 {
780 .procname = "panic_on_unrecovered_nmi",
781 .data = &panic_on_unrecovered_nmi,
782 .maxlen = sizeof(int),
783 .mode = 0644,
784 .proc_handler = proc_dointvec,
785 },
786 {
787 .procname = "panic_on_io_nmi",
788 .data = &panic_on_io_nmi,
789 .maxlen = sizeof(int),
790 .mode = 0644,
791 .proc_handler = proc_dointvec,
792 },
793 #ifdef CONFIG_DEBUG_STACKOVERFLOW
794 {
795 .procname = "panic_on_stackoverflow",
796 .data = &sysctl_panic_on_stackoverflow,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec,
800 },
801 #endif
802 {
803 .procname = "bootloader_type",
804 .data = &bootloader_type,
805 .maxlen = sizeof (int),
806 .mode = 0444,
807 .proc_handler = proc_dointvec,
808 },
809 {
810 .procname = "bootloader_version",
811 .data = &bootloader_version,
812 .maxlen = sizeof (int),
813 .mode = 0444,
814 .proc_handler = proc_dointvec,
815 },
816 {
817 .procname = "kstack_depth_to_print",
818 .data = &kstack_depth_to_print,
819 .maxlen = sizeof(int),
820 .mode = 0644,
821 .proc_handler = proc_dointvec,
822 },
823 {
824 .procname = "io_delay_type",
825 .data = &io_delay_type,
826 .maxlen = sizeof(int),
827 .mode = 0644,
828 .proc_handler = proc_dointvec,
829 },
830 #endif
831 #if defined(CONFIG_MMU)
832 {
833 .procname = "randomize_va_space",
834 .data = &randomize_va_space,
835 .maxlen = sizeof(int),
836 .mode = 0644,
837 .proc_handler = proc_dointvec,
838 },
839 #endif
840 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
841 {
842 .procname = "spin_retry",
843 .data = &spin_retry,
844 .maxlen = sizeof (int),
845 .mode = 0644,
846 .proc_handler = proc_dointvec,
847 },
848 #endif
849 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
850 {
851 .procname = "acpi_video_flags",
852 .data = &acpi_realmode_flags,
853 .maxlen = sizeof (unsigned long),
854 .mode = 0644,
855 .proc_handler = proc_doulongvec_minmax,
856 },
857 #endif
858 #ifdef CONFIG_IA64
859 {
860 .procname = "ignore-unaligned-usertrap",
861 .data = &no_unaligned_warning,
862 .maxlen = sizeof (int),
863 .mode = 0644,
864 .proc_handler = proc_dointvec,
865 },
866 {
867 .procname = "unaligned-dump-stack",
868 .data = &unaligned_dump_stack,
869 .maxlen = sizeof (int),
870 .mode = 0644,
871 .proc_handler = proc_dointvec,
872 },
873 #endif
874 #ifdef CONFIG_DETECT_HUNG_TASK
875 {
876 .procname = "hung_task_panic",
877 .data = &sysctl_hung_task_panic,
878 .maxlen = sizeof(int),
879 .mode = 0644,
880 .proc_handler = proc_dointvec_minmax,
881 .extra1 = &zero,
882 .extra2 = &one,
883 },
884 {
885 .procname = "hung_task_check_count",
886 .data = &sysctl_hung_task_check_count,
887 .maxlen = sizeof(unsigned long),
888 .mode = 0644,
889 .proc_handler = proc_doulongvec_minmax,
890 },
891 {
892 .procname = "hung_task_timeout_secs",
893 .data = &sysctl_hung_task_timeout_secs,
894 .maxlen = sizeof(unsigned long),
895 .mode = 0644,
896 .proc_handler = proc_dohung_task_timeout_secs,
897 },
898 {
899 .procname = "hung_task_warnings",
900 .data = &sysctl_hung_task_warnings,
901 .maxlen = sizeof(unsigned long),
902 .mode = 0644,
903 .proc_handler = proc_doulongvec_minmax,
904 },
905 #endif
906 #ifdef CONFIG_COMPAT
907 {
908 .procname = "compat-log",
909 .data = &compat_log,
910 .maxlen = sizeof (int),
911 .mode = 0644,
912 .proc_handler = proc_dointvec,
913 },
914 #endif
915 #ifdef CONFIG_RT_MUTEXES
916 {
917 .procname = "max_lock_depth",
918 .data = &max_lock_depth,
919 .maxlen = sizeof(int),
920 .mode = 0644,
921 .proc_handler = proc_dointvec,
922 },
923 #endif
924 {
925 .procname = "poweroff_cmd",
926 .data = &poweroff_cmd,
927 .maxlen = POWEROFF_CMD_PATH_LEN,
928 .mode = 0644,
929 .proc_handler = proc_dostring,
930 },
931 #ifdef CONFIG_KEYS
932 {
933 .procname = "keys",
934 .mode = 0555,
935 .child = key_sysctls,
936 },
937 #endif
938 #ifdef CONFIG_RCU_TORTURE_TEST
939 {
940 .procname = "rcutorture_runnable",
941 .data = &rcutorture_runnable,
942 .maxlen = sizeof(int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec,
945 },
946 #endif
947 #ifdef CONFIG_PERF_EVENTS
948 /*
949 * User-space scripts rely on the existence of this file
950 * as a feature check for perf_events being enabled.
951 *
952 * So it's an ABI, do not remove!
953 */
954 {
955 .procname = "perf_event_paranoid",
956 .data = &sysctl_perf_event_paranoid,
957 .maxlen = sizeof(sysctl_perf_event_paranoid),
958 .mode = 0644,
959 .proc_handler = proc_dointvec,
960 },
961 {
962 .procname = "perf_event_mlock_kb",
963 .data = &sysctl_perf_event_mlock,
964 .maxlen = sizeof(sysctl_perf_event_mlock),
965 .mode = 0644,
966 .proc_handler = proc_dointvec,
967 },
968 {
969 .procname = "perf_event_max_sample_rate",
970 .data = &sysctl_perf_event_sample_rate,
971 .maxlen = sizeof(sysctl_perf_event_sample_rate),
972 .mode = 0644,
973 .proc_handler = perf_proc_update_handler,
974 },
975 #endif
976 #ifdef CONFIG_KMEMCHECK
977 {
978 .procname = "kmemcheck",
979 .data = &kmemcheck_enabled,
980 .maxlen = sizeof(int),
981 .mode = 0644,
982 .proc_handler = proc_dointvec,
983 },
984 #endif
985 #ifdef CONFIG_BLOCK
986 {
987 .procname = "blk_iopoll",
988 .data = &blk_iopoll_enabled,
989 .maxlen = sizeof(int),
990 .mode = 0644,
991 .proc_handler = proc_dointvec,
992 },
993 #endif
994 { }
995 };
996
997 static struct ctl_table vm_table[] = {
998 {
999 .procname = "overcommit_memory",
1000 .data = &sysctl_overcommit_memory,
1001 .maxlen = sizeof(sysctl_overcommit_memory),
1002 .mode = 0644,
1003 .proc_handler = proc_dointvec_minmax,
1004 .extra1 = &zero,
1005 .extra2 = &two,
1006 },
1007 {
1008 .procname = "panic_on_oom",
1009 .data = &sysctl_panic_on_oom,
1010 .maxlen = sizeof(sysctl_panic_on_oom),
1011 .mode = 0644,
1012 .proc_handler = proc_dointvec_minmax,
1013 .extra1 = &zero,
1014 .extra2 = &two,
1015 },
1016 {
1017 .procname = "oom_kill_allocating_task",
1018 .data = &sysctl_oom_kill_allocating_task,
1019 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1020 .mode = 0644,
1021 .proc_handler = proc_dointvec,
1022 },
1023 {
1024 .procname = "oom_dump_tasks",
1025 .data = &sysctl_oom_dump_tasks,
1026 .maxlen = sizeof(sysctl_oom_dump_tasks),
1027 .mode = 0644,
1028 .proc_handler = proc_dointvec,
1029 },
1030 {
1031 .procname = "overcommit_ratio",
1032 .data = &sysctl_overcommit_ratio,
1033 .maxlen = sizeof(sysctl_overcommit_ratio),
1034 .mode = 0644,
1035 .proc_handler = proc_dointvec,
1036 },
1037 {
1038 .procname = "page-cluster",
1039 .data = &page_cluster,
1040 .maxlen = sizeof(int),
1041 .mode = 0644,
1042 .proc_handler = proc_dointvec_minmax,
1043 .extra1 = &zero,
1044 },
1045 {
1046 .procname = "dirty_background_ratio",
1047 .data = &dirty_background_ratio,
1048 .maxlen = sizeof(dirty_background_ratio),
1049 .mode = 0644,
1050 .proc_handler = dirty_background_ratio_handler,
1051 .extra1 = &zero,
1052 .extra2 = &one_hundred,
1053 },
1054 {
1055 .procname = "dirty_background_bytes",
1056 .data = &dirty_background_bytes,
1057 .maxlen = sizeof(dirty_background_bytes),
1058 .mode = 0644,
1059 .proc_handler = dirty_background_bytes_handler,
1060 .extra1 = &one_ul,
1061 },
1062 {
1063 .procname = "dirty_ratio",
1064 .data = &vm_dirty_ratio,
1065 .maxlen = sizeof(vm_dirty_ratio),
1066 .mode = 0644,
1067 .proc_handler = dirty_ratio_handler,
1068 .extra1 = &zero,
1069 .extra2 = &one_hundred,
1070 },
1071 {
1072 .procname = "dirty_bytes",
1073 .data = &vm_dirty_bytes,
1074 .maxlen = sizeof(vm_dirty_bytes),
1075 .mode = 0644,
1076 .proc_handler = dirty_bytes_handler,
1077 .extra1 = &dirty_bytes_min,
1078 },
1079 {
1080 .procname = "dirty_writeback_centisecs",
1081 .data = &dirty_writeback_interval,
1082 .maxlen = sizeof(dirty_writeback_interval),
1083 .mode = 0644,
1084 .proc_handler = dirty_writeback_centisecs_handler,
1085 },
1086 {
1087 .procname = "dirty_expire_centisecs",
1088 .data = &dirty_expire_interval,
1089 .maxlen = sizeof(dirty_expire_interval),
1090 .mode = 0644,
1091 .proc_handler = proc_dointvec_minmax,
1092 .extra1 = &zero,
1093 },
1094 {
1095 .procname = "nr_pdflush_threads",
1096 .data = &nr_pdflush_threads,
1097 .maxlen = sizeof nr_pdflush_threads,
1098 .mode = 0444 /* read-only*/,
1099 .proc_handler = proc_dointvec,
1100 },
1101 {
1102 .procname = "swappiness",
1103 .data = &vm_swappiness,
1104 .maxlen = sizeof(vm_swappiness),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec_minmax,
1107 .extra1 = &zero,
1108 .extra2 = &one_hundred,
1109 },
1110 #ifdef CONFIG_HUGETLB_PAGE
1111 {
1112 .procname = "nr_hugepages",
1113 .data = NULL,
1114 .maxlen = sizeof(unsigned long),
1115 .mode = 0644,
1116 .proc_handler = hugetlb_sysctl_handler,
1117 .extra1 = (void *)&hugetlb_zero,
1118 .extra2 = (void *)&hugetlb_infinity,
1119 },
1120 #ifdef CONFIG_NUMA
1121 {
1122 .procname = "nr_hugepages_mempolicy",
1123 .data = NULL,
1124 .maxlen = sizeof(unsigned long),
1125 .mode = 0644,
1126 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1127 .extra1 = (void *)&hugetlb_zero,
1128 .extra2 = (void *)&hugetlb_infinity,
1129 },
1130 #endif
1131 {
1132 .procname = "hugetlb_shm_group",
1133 .data = &sysctl_hugetlb_shm_group,
1134 .maxlen = sizeof(gid_t),
1135 .mode = 0644,
1136 .proc_handler = proc_dointvec,
1137 },
1138 {
1139 .procname = "hugepages_treat_as_movable",
1140 .data = &hugepages_treat_as_movable,
1141 .maxlen = sizeof(int),
1142 .mode = 0644,
1143 .proc_handler = hugetlb_treat_movable_handler,
1144 },
1145 {
1146 .procname = "nr_overcommit_hugepages",
1147 .data = NULL,
1148 .maxlen = sizeof(unsigned long),
1149 .mode = 0644,
1150 .proc_handler = hugetlb_overcommit_handler,
1151 .extra1 = (void *)&hugetlb_zero,
1152 .extra2 = (void *)&hugetlb_infinity,
1153 },
1154 #endif
1155 {
1156 .procname = "lowmem_reserve_ratio",
1157 .data = &sysctl_lowmem_reserve_ratio,
1158 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1159 .mode = 0644,
1160 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1161 },
1162 {
1163 .procname = "drop_caches",
1164 .data = &sysctl_drop_caches,
1165 .maxlen = sizeof(int),
1166 .mode = 0644,
1167 .proc_handler = drop_caches_sysctl_handler,
1168 .extra1 = &one,
1169 .extra2 = &three,
1170 },
1171 #ifdef CONFIG_COMPACTION
1172 {
1173 .procname = "compact_memory",
1174 .data = &sysctl_compact_memory,
1175 .maxlen = sizeof(int),
1176 .mode = 0200,
1177 .proc_handler = sysctl_compaction_handler,
1178 },
1179 {
1180 .procname = "extfrag_threshold",
1181 .data = &sysctl_extfrag_threshold,
1182 .maxlen = sizeof(int),
1183 .mode = 0644,
1184 .proc_handler = sysctl_extfrag_handler,
1185 .extra1 = &min_extfrag_threshold,
1186 .extra2 = &max_extfrag_threshold,
1187 },
1188
1189 #endif /* CONFIG_COMPACTION */
1190 {
1191 .procname = "min_free_kbytes",
1192 .data = &min_free_kbytes,
1193 .maxlen = sizeof(min_free_kbytes),
1194 .mode = 0644,
1195 .proc_handler = min_free_kbytes_sysctl_handler,
1196 .extra1 = &zero,
1197 },
1198 {
1199 .procname = "percpu_pagelist_fraction",
1200 .data = &percpu_pagelist_fraction,
1201 .maxlen = sizeof(percpu_pagelist_fraction),
1202 .mode = 0644,
1203 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1204 .extra1 = &min_percpu_pagelist_fract,
1205 },
1206 #ifdef CONFIG_MMU
1207 {
1208 .procname = "max_map_count",
1209 .data = &sysctl_max_map_count,
1210 .maxlen = sizeof(sysctl_max_map_count),
1211 .mode = 0644,
1212 .proc_handler = proc_dointvec_minmax,
1213 .extra1 = &zero,
1214 },
1215 #else
1216 {
1217 .procname = "nr_trim_pages",
1218 .data = &sysctl_nr_trim_pages,
1219 .maxlen = sizeof(sysctl_nr_trim_pages),
1220 .mode = 0644,
1221 .proc_handler = proc_dointvec_minmax,
1222 .extra1 = &zero,
1223 },
1224 #endif
1225 {
1226 .procname = "laptop_mode",
1227 .data = &laptop_mode,
1228 .maxlen = sizeof(laptop_mode),
1229 .mode = 0644,
1230 .proc_handler = proc_dointvec_jiffies,
1231 },
1232 {
1233 .procname = "block_dump",
1234 .data = &block_dump,
1235 .maxlen = sizeof(block_dump),
1236 .mode = 0644,
1237 .proc_handler = proc_dointvec,
1238 .extra1 = &zero,
1239 },
1240 {
1241 .procname = "vfs_cache_pressure",
1242 .data = &sysctl_vfs_cache_pressure,
1243 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1244 .mode = 0644,
1245 .proc_handler = proc_dointvec,
1246 .extra1 = &zero,
1247 },
1248 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1249 {
1250 .procname = "legacy_va_layout",
1251 .data = &sysctl_legacy_va_layout,
1252 .maxlen = sizeof(sysctl_legacy_va_layout),
1253 .mode = 0644,
1254 .proc_handler = proc_dointvec,
1255 .extra1 = &zero,
1256 },
1257 #endif
1258 #ifdef CONFIG_NUMA
1259 {
1260 .procname = "zone_reclaim_mode",
1261 .data = &zone_reclaim_mode,
1262 .maxlen = sizeof(zone_reclaim_mode),
1263 .mode = 0644,
1264 .proc_handler = proc_dointvec,
1265 .extra1 = &zero,
1266 },
1267 {
1268 .procname = "min_unmapped_ratio",
1269 .data = &sysctl_min_unmapped_ratio,
1270 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1271 .mode = 0644,
1272 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1273 .extra1 = &zero,
1274 .extra2 = &one_hundred,
1275 },
1276 {
1277 .procname = "min_slab_ratio",
1278 .data = &sysctl_min_slab_ratio,
1279 .maxlen = sizeof(sysctl_min_slab_ratio),
1280 .mode = 0644,
1281 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1282 .extra1 = &zero,
1283 .extra2 = &one_hundred,
1284 },
1285 #endif
1286 #ifdef CONFIG_SMP
1287 {
1288 .procname = "stat_interval",
1289 .data = &sysctl_stat_interval,
1290 .maxlen = sizeof(sysctl_stat_interval),
1291 .mode = 0644,
1292 .proc_handler = proc_dointvec_jiffies,
1293 },
1294 #endif
1295 #ifdef CONFIG_MMU
1296 {
1297 .procname = "mmap_min_addr",
1298 .data = &dac_mmap_min_addr,
1299 .maxlen = sizeof(unsigned long),
1300 .mode = 0644,
1301 .proc_handler = mmap_min_addr_handler,
1302 },
1303 #endif
1304 #ifdef CONFIG_NUMA
1305 {
1306 .procname = "numa_zonelist_order",
1307 .data = &numa_zonelist_order,
1308 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1309 .mode = 0644,
1310 .proc_handler = numa_zonelist_order_handler,
1311 },
1312 #endif
1313 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1314 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1315 {
1316 .procname = "vdso_enabled",
1317 .data = &vdso_enabled,
1318 .maxlen = sizeof(vdso_enabled),
1319 .mode = 0644,
1320 .proc_handler = proc_dointvec,
1321 .extra1 = &zero,
1322 },
1323 #endif
1324 #ifdef CONFIG_HIGHMEM
1325 {
1326 .procname = "highmem_is_dirtyable",
1327 .data = &vm_highmem_is_dirtyable,
1328 .maxlen = sizeof(vm_highmem_is_dirtyable),
1329 .mode = 0644,
1330 .proc_handler = proc_dointvec_minmax,
1331 .extra1 = &zero,
1332 .extra2 = &one,
1333 },
1334 #endif
1335 {
1336 .procname = "scan_unevictable_pages",
1337 .data = &scan_unevictable_pages,
1338 .maxlen = sizeof(scan_unevictable_pages),
1339 .mode = 0644,
1340 .proc_handler = scan_unevictable_handler,
1341 },
1342 #ifdef CONFIG_MEMORY_FAILURE
1343 {
1344 .procname = "memory_failure_early_kill",
1345 .data = &sysctl_memory_failure_early_kill,
1346 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1347 .mode = 0644,
1348 .proc_handler = proc_dointvec_minmax,
1349 .extra1 = &zero,
1350 .extra2 = &one,
1351 },
1352 {
1353 .procname = "memory_failure_recovery",
1354 .data = &sysctl_memory_failure_recovery,
1355 .maxlen = sizeof(sysctl_memory_failure_recovery),
1356 .mode = 0644,
1357 .proc_handler = proc_dointvec_minmax,
1358 .extra1 = &zero,
1359 .extra2 = &one,
1360 },
1361 #endif
1362 { }
1363 };
1364
1365 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1366 static struct ctl_table binfmt_misc_table[] = {
1367 { }
1368 };
1369 #endif
1370
1371 static struct ctl_table fs_table[] = {
1372 {
1373 .procname = "inode-nr",
1374 .data = &inodes_stat,
1375 .maxlen = 2*sizeof(int),
1376 .mode = 0444,
1377 .proc_handler = proc_nr_inodes,
1378 },
1379 {
1380 .procname = "inode-state",
1381 .data = &inodes_stat,
1382 .maxlen = 7*sizeof(int),
1383 .mode = 0444,
1384 .proc_handler = proc_nr_inodes,
1385 },
1386 {
1387 .procname = "file-nr",
1388 .data = &files_stat,
1389 .maxlen = sizeof(files_stat),
1390 .mode = 0444,
1391 .proc_handler = proc_nr_files,
1392 },
1393 {
1394 .procname = "file-max",
1395 .data = &files_stat.max_files,
1396 .maxlen = sizeof(files_stat.max_files),
1397 .mode = 0644,
1398 .proc_handler = proc_doulongvec_minmax,
1399 },
1400 {
1401 .procname = "nr_open",
1402 .data = &sysctl_nr_open,
1403 .maxlen = sizeof(int),
1404 .mode = 0644,
1405 .proc_handler = proc_dointvec_minmax,
1406 .extra1 = &sysctl_nr_open_min,
1407 .extra2 = &sysctl_nr_open_max,
1408 },
1409 {
1410 .procname = "dentry-state",
1411 .data = &dentry_stat,
1412 .maxlen = 6*sizeof(int),
1413 .mode = 0444,
1414 .proc_handler = proc_nr_dentry,
1415 },
1416 {
1417 .procname = "overflowuid",
1418 .data = &fs_overflowuid,
1419 .maxlen = sizeof(int),
1420 .mode = 0644,
1421 .proc_handler = proc_dointvec_minmax,
1422 .extra1 = &minolduid,
1423 .extra2 = &maxolduid,
1424 },
1425 {
1426 .procname = "overflowgid",
1427 .data = &fs_overflowgid,
1428 .maxlen = sizeof(int),
1429 .mode = 0644,
1430 .proc_handler = proc_dointvec_minmax,
1431 .extra1 = &minolduid,
1432 .extra2 = &maxolduid,
1433 },
1434 #ifdef CONFIG_FILE_LOCKING
1435 {
1436 .procname = "leases-enable",
1437 .data = &leases_enable,
1438 .maxlen = sizeof(int),
1439 .mode = 0644,
1440 .proc_handler = proc_dointvec,
1441 },
1442 #endif
1443 #ifdef CONFIG_DNOTIFY
1444 {
1445 .procname = "dir-notify-enable",
1446 .data = &dir_notify_enable,
1447 .maxlen = sizeof(int),
1448 .mode = 0644,
1449 .proc_handler = proc_dointvec,
1450 },
1451 #endif
1452 #ifdef CONFIG_MMU
1453 #ifdef CONFIG_FILE_LOCKING
1454 {
1455 .procname = "lease-break-time",
1456 .data = &lease_break_time,
1457 .maxlen = sizeof(int),
1458 .mode = 0644,
1459 .proc_handler = proc_dointvec,
1460 },
1461 #endif
1462 #ifdef CONFIG_AIO
1463 {
1464 .procname = "aio-nr",
1465 .data = &aio_nr,
1466 .maxlen = sizeof(aio_nr),
1467 .mode = 0444,
1468 .proc_handler = proc_doulongvec_minmax,
1469 },
1470 {
1471 .procname = "aio-max-nr",
1472 .data = &aio_max_nr,
1473 .maxlen = sizeof(aio_max_nr),
1474 .mode = 0644,
1475 .proc_handler = proc_doulongvec_minmax,
1476 },
1477 #endif /* CONFIG_AIO */
1478 #ifdef CONFIG_INOTIFY_USER
1479 {
1480 .procname = "inotify",
1481 .mode = 0555,
1482 .child = inotify_table,
1483 },
1484 #endif
1485 #ifdef CONFIG_EPOLL
1486 {
1487 .procname = "epoll",
1488 .mode = 0555,
1489 .child = epoll_table,
1490 },
1491 #endif
1492 #endif
1493 {
1494 .procname = "suid_dumpable",
1495 .data = &suid_dumpable,
1496 .maxlen = sizeof(int),
1497 .mode = 0644,
1498 .proc_handler = proc_dointvec_minmax,
1499 .extra1 = &zero,
1500 .extra2 = &two,
1501 },
1502 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1503 {
1504 .procname = "binfmt_misc",
1505 .mode = 0555,
1506 .child = binfmt_misc_table,
1507 },
1508 #endif
1509 {
1510 .procname = "pipe-max-size",
1511 .data = &pipe_max_size,
1512 .maxlen = sizeof(int),
1513 .mode = 0644,
1514 .proc_handler = &pipe_proc_fn,
1515 .extra1 = &pipe_min_size,
1516 },
1517 { }
1518 };
1519
1520 static struct ctl_table debug_table[] = {
1521 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1522 defined(CONFIG_S390) || defined(CONFIG_TILE)
1523 {
1524 .procname = "exception-trace",
1525 .data = &show_unhandled_signals,
1526 .maxlen = sizeof(int),
1527 .mode = 0644,
1528 .proc_handler = proc_dointvec
1529 },
1530 #endif
1531 #if defined(CONFIG_OPTPROBES)
1532 {
1533 .procname = "kprobes-optimization",
1534 .data = &sysctl_kprobes_optimization,
1535 .maxlen = sizeof(int),
1536 .mode = 0644,
1537 .proc_handler = proc_kprobes_optimization_handler,
1538 .extra1 = &zero,
1539 .extra2 = &one,
1540 },
1541 #endif
1542 { }
1543 };
1544
1545 static struct ctl_table dev_table[] = {
1546 { }
1547 };
1548
1549 int __init sysctl_init(void)
1550 {
1551 register_sysctl_table(sysctl_base_table);
1552 return 0;
1553 }
1554
1555 #endif /* CONFIG_SYSCTL */
1556
1557 /*
1558 * /proc/sys support
1559 */
1560
1561 #ifdef CONFIG_PROC_SYSCTL
1562
1563 static int _proc_do_string(void* data, int maxlen, int write,
1564 void __user *buffer,
1565 size_t *lenp, loff_t *ppos)
1566 {
1567 size_t len;
1568 char __user *p;
1569 char c;
1570
1571 if (!data || !maxlen || !*lenp) {
1572 *lenp = 0;
1573 return 0;
1574 }
1575
1576 if (write) {
1577 len = 0;
1578 p = buffer;
1579 while (len < *lenp) {
1580 if (get_user(c, p++))
1581 return -EFAULT;
1582 if (c == 0 || c == '\n')
1583 break;
1584 len++;
1585 }
1586 if (len >= maxlen)
1587 len = maxlen-1;
1588 if(copy_from_user(data, buffer, len))
1589 return -EFAULT;
1590 ((char *) data)[len] = 0;
1591 *ppos += *lenp;
1592 } else {
1593 len = strlen(data);
1594 if (len > maxlen)
1595 len = maxlen;
1596
1597 if (*ppos > len) {
1598 *lenp = 0;
1599 return 0;
1600 }
1601
1602 data += *ppos;
1603 len -= *ppos;
1604
1605 if (len > *lenp)
1606 len = *lenp;
1607 if (len)
1608 if(copy_to_user(buffer, data, len))
1609 return -EFAULT;
1610 if (len < *lenp) {
1611 if(put_user('\n', ((char __user *) buffer) + len))
1612 return -EFAULT;
1613 len++;
1614 }
1615 *lenp = len;
1616 *ppos += len;
1617 }
1618 return 0;
1619 }
1620
1621 /**
1622 * proc_dostring - read a string sysctl
1623 * @table: the sysctl table
1624 * @write: %TRUE if this is a write to the sysctl file
1625 * @buffer: the user buffer
1626 * @lenp: the size of the user buffer
1627 * @ppos: file position
1628 *
1629 * Reads/writes a string from/to the user buffer. If the kernel
1630 * buffer provided is not large enough to hold the string, the
1631 * string is truncated. The copied string is %NULL-terminated.
1632 * If the string is being read by the user process, it is copied
1633 * and a newline '\n' is added. It is truncated if the buffer is
1634 * not large enough.
1635 *
1636 * Returns 0 on success.
1637 */
1638 int proc_dostring(struct ctl_table *table, int write,
1639 void __user *buffer, size_t *lenp, loff_t *ppos)
1640 {
1641 return _proc_do_string(table->data, table->maxlen, write,
1642 buffer, lenp, ppos);
1643 }
1644
1645 static size_t proc_skip_spaces(char **buf)
1646 {
1647 size_t ret;
1648 char *tmp = skip_spaces(*buf);
1649 ret = tmp - *buf;
1650 *buf = tmp;
1651 return ret;
1652 }
1653
1654 static void proc_skip_char(char **buf, size_t *size, const char v)
1655 {
1656 while (*size) {
1657 if (**buf != v)
1658 break;
1659 (*size)--;
1660 (*buf)++;
1661 }
1662 }
1663
1664 #define TMPBUFLEN 22
1665 /**
1666 * proc_get_long - reads an ASCII formatted integer from a user buffer
1667 *
1668 * @buf: a kernel buffer
1669 * @size: size of the kernel buffer
1670 * @val: this is where the number will be stored
1671 * @neg: set to %TRUE if number is negative
1672 * @perm_tr: a vector which contains the allowed trailers
1673 * @perm_tr_len: size of the perm_tr vector
1674 * @tr: pointer to store the trailer character
1675 *
1676 * In case of success %0 is returned and @buf and @size are updated with
1677 * the amount of bytes read. If @tr is non-NULL and a trailing
1678 * character exists (size is non-zero after returning from this
1679 * function), @tr is updated with the trailing character.
1680 */
1681 static int proc_get_long(char **buf, size_t *size,
1682 unsigned long *val, bool *neg,
1683 const char *perm_tr, unsigned perm_tr_len, char *tr)
1684 {
1685 int len;
1686 char *p, tmp[TMPBUFLEN];
1687
1688 if (!*size)
1689 return -EINVAL;
1690
1691 len = *size;
1692 if (len > TMPBUFLEN - 1)
1693 len = TMPBUFLEN - 1;
1694
1695 memcpy(tmp, *buf, len);
1696
1697 tmp[len] = 0;
1698 p = tmp;
1699 if (*p == '-' && *size > 1) {
1700 *neg = true;
1701 p++;
1702 } else
1703 *neg = false;
1704 if (!isdigit(*p))
1705 return -EINVAL;
1706
1707 *val = simple_strtoul(p, &p, 0);
1708
1709 len = p - tmp;
1710
1711 /* We don't know if the next char is whitespace thus we may accept
1712 * invalid integers (e.g. 1234...a) or two integers instead of one
1713 * (e.g. 123...1). So lets not allow such large numbers. */
1714 if (len == TMPBUFLEN - 1)
1715 return -EINVAL;
1716
1717 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1718 return -EINVAL;
1719
1720 if (tr && (len < *size))
1721 *tr = *p;
1722
1723 *buf += len;
1724 *size -= len;
1725
1726 return 0;
1727 }
1728
1729 /**
1730 * proc_put_long - converts an integer to a decimal ASCII formatted string
1731 *
1732 * @buf: the user buffer
1733 * @size: the size of the user buffer
1734 * @val: the integer to be converted
1735 * @neg: sign of the number, %TRUE for negative
1736 *
1737 * In case of success %0 is returned and @buf and @size are updated with
1738 * the amount of bytes written.
1739 */
1740 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1741 bool neg)
1742 {
1743 int len;
1744 char tmp[TMPBUFLEN], *p = tmp;
1745
1746 sprintf(p, "%s%lu", neg ? "-" : "", val);
1747 len = strlen(tmp);
1748 if (len > *size)
1749 len = *size;
1750 if (copy_to_user(*buf, tmp, len))
1751 return -EFAULT;
1752 *size -= len;
1753 *buf += len;
1754 return 0;
1755 }
1756 #undef TMPBUFLEN
1757
1758 static int proc_put_char(void __user **buf, size_t *size, char c)
1759 {
1760 if (*size) {
1761 char __user **buffer = (char __user **)buf;
1762 if (put_user(c, *buffer))
1763 return -EFAULT;
1764 (*size)--, (*buffer)++;
1765 *buf = *buffer;
1766 }
1767 return 0;
1768 }
1769
1770 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1771 int *valp,
1772 int write, void *data)
1773 {
1774 if (write) {
1775 *valp = *negp ? -*lvalp : *lvalp;
1776 } else {
1777 int val = *valp;
1778 if (val < 0) {
1779 *negp = true;
1780 *lvalp = (unsigned long)-val;
1781 } else {
1782 *negp = false;
1783 *lvalp = (unsigned long)val;
1784 }
1785 }
1786 return 0;
1787 }
1788
1789 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1790
1791 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1792 int write, void __user *buffer,
1793 size_t *lenp, loff_t *ppos,
1794 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1795 int write, void *data),
1796 void *data)
1797 {
1798 int *i, vleft, first = 1, err = 0;
1799 unsigned long page = 0;
1800 size_t left;
1801 char *kbuf;
1802
1803 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1804 *lenp = 0;
1805 return 0;
1806 }
1807
1808 i = (int *) tbl_data;
1809 vleft = table->maxlen / sizeof(*i);
1810 left = *lenp;
1811
1812 if (!conv)
1813 conv = do_proc_dointvec_conv;
1814
1815 if (write) {
1816 if (left > PAGE_SIZE - 1)
1817 left = PAGE_SIZE - 1;
1818 page = __get_free_page(GFP_TEMPORARY);
1819 kbuf = (char *) page;
1820 if (!kbuf)
1821 return -ENOMEM;
1822 if (copy_from_user(kbuf, buffer, left)) {
1823 err = -EFAULT;
1824 goto free;
1825 }
1826 kbuf[left] = 0;
1827 }
1828
1829 for (; left && vleft--; i++, first=0) {
1830 unsigned long lval;
1831 bool neg;
1832
1833 if (write) {
1834 left -= proc_skip_spaces(&kbuf);
1835
1836 if (!left)
1837 break;
1838 err = proc_get_long(&kbuf, &left, &lval, &neg,
1839 proc_wspace_sep,
1840 sizeof(proc_wspace_sep), NULL);
1841 if (err)
1842 break;
1843 if (conv(&neg, &lval, i, 1, data)) {
1844 err = -EINVAL;
1845 break;
1846 }
1847 } else {
1848 if (conv(&neg, &lval, i, 0, data)) {
1849 err = -EINVAL;
1850 break;
1851 }
1852 if (!first)
1853 err = proc_put_char(&buffer, &left, '\t');
1854 if (err)
1855 break;
1856 err = proc_put_long(&buffer, &left, lval, neg);
1857 if (err)
1858 break;
1859 }
1860 }
1861
1862 if (!write && !first && left && !err)
1863 err = proc_put_char(&buffer, &left, '\n');
1864 if (write && !err && left)
1865 left -= proc_skip_spaces(&kbuf);
1866 free:
1867 if (write) {
1868 free_page(page);
1869 if (first)
1870 return err ? : -EINVAL;
1871 }
1872 *lenp -= left;
1873 *ppos += *lenp;
1874 return err;
1875 }
1876
1877 static int do_proc_dointvec(struct ctl_table *table, int write,
1878 void __user *buffer, size_t *lenp, loff_t *ppos,
1879 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1880 int write, void *data),
1881 void *data)
1882 {
1883 return __do_proc_dointvec(table->data, table, write,
1884 buffer, lenp, ppos, conv, data);
1885 }
1886
1887 /**
1888 * proc_dointvec - read a vector of integers
1889 * @table: the sysctl table
1890 * @write: %TRUE if this is a write to the sysctl file
1891 * @buffer: the user buffer
1892 * @lenp: the size of the user buffer
1893 * @ppos: file position
1894 *
1895 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1896 * values from/to the user buffer, treated as an ASCII string.
1897 *
1898 * Returns 0 on success.
1899 */
1900 int proc_dointvec(struct ctl_table *table, int write,
1901 void __user *buffer, size_t *lenp, loff_t *ppos)
1902 {
1903 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1904 NULL,NULL);
1905 }
1906
1907 /*
1908 * Taint values can only be increased
1909 * This means we can safely use a temporary.
1910 */
1911 static int proc_taint(struct ctl_table *table, int write,
1912 void __user *buffer, size_t *lenp, loff_t *ppos)
1913 {
1914 struct ctl_table t;
1915 unsigned long tmptaint = get_taint();
1916 int err;
1917
1918 if (write && !capable(CAP_SYS_ADMIN))
1919 return -EPERM;
1920
1921 t = *table;
1922 t.data = &tmptaint;
1923 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1924 if (err < 0)
1925 return err;
1926
1927 if (write) {
1928 /*
1929 * Poor man's atomic or. Not worth adding a primitive
1930 * to everyone's atomic.h for this
1931 */
1932 int i;
1933 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1934 if ((tmptaint >> i) & 1)
1935 add_taint(i);
1936 }
1937 }
1938
1939 return err;
1940 }
1941
1942 #ifdef CONFIG_PRINTK
1943 static int proc_dmesg_restrict(struct ctl_table *table, int write,
1944 void __user *buffer, size_t *lenp, loff_t *ppos)
1945 {
1946 if (write && !capable(CAP_SYS_ADMIN))
1947 return -EPERM;
1948
1949 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1950 }
1951 #endif
1952
1953 struct do_proc_dointvec_minmax_conv_param {
1954 int *min;
1955 int *max;
1956 };
1957
1958 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1959 int *valp,
1960 int write, void *data)
1961 {
1962 struct do_proc_dointvec_minmax_conv_param *param = data;
1963 if (write) {
1964 int val = *negp ? -*lvalp : *lvalp;
1965 if ((param->min && *param->min > val) ||
1966 (param->max && *param->max < val))
1967 return -EINVAL;
1968 *valp = val;
1969 } else {
1970 int val = *valp;
1971 if (val < 0) {
1972 *negp = true;
1973 *lvalp = (unsigned long)-val;
1974 } else {
1975 *negp = false;
1976 *lvalp = (unsigned long)val;
1977 }
1978 }
1979 return 0;
1980 }
1981
1982 /**
1983 * proc_dointvec_minmax - read a vector of integers with min/max values
1984 * @table: the sysctl table
1985 * @write: %TRUE if this is a write to the sysctl file
1986 * @buffer: the user buffer
1987 * @lenp: the size of the user buffer
1988 * @ppos: file position
1989 *
1990 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1991 * values from/to the user buffer, treated as an ASCII string.
1992 *
1993 * This routine will ensure the values are within the range specified by
1994 * table->extra1 (min) and table->extra2 (max).
1995 *
1996 * Returns 0 on success.
1997 */
1998 int proc_dointvec_minmax(struct ctl_table *table, int write,
1999 void __user *buffer, size_t *lenp, loff_t *ppos)
2000 {
2001 struct do_proc_dointvec_minmax_conv_param param = {
2002 .min = (int *) table->extra1,
2003 .max = (int *) table->extra2,
2004 };
2005 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2006 do_proc_dointvec_minmax_conv, &param);
2007 }
2008
2009 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2010 void __user *buffer,
2011 size_t *lenp, loff_t *ppos,
2012 unsigned long convmul,
2013 unsigned long convdiv)
2014 {
2015 unsigned long *i, *min, *max;
2016 int vleft, first = 1, err = 0;
2017 unsigned long page = 0;
2018 size_t left;
2019 char *kbuf;
2020
2021 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2022 *lenp = 0;
2023 return 0;
2024 }
2025
2026 i = (unsigned long *) data;
2027 min = (unsigned long *) table->extra1;
2028 max = (unsigned long *) table->extra2;
2029 vleft = table->maxlen / sizeof(unsigned long);
2030 left = *lenp;
2031
2032 if (write) {
2033 if (left > PAGE_SIZE - 1)
2034 left = PAGE_SIZE - 1;
2035 page = __get_free_page(GFP_TEMPORARY);
2036 kbuf = (char *) page;
2037 if (!kbuf)
2038 return -ENOMEM;
2039 if (copy_from_user(kbuf, buffer, left)) {
2040 err = -EFAULT;
2041 goto free;
2042 }
2043 kbuf[left] = 0;
2044 }
2045
2046 for (; left && vleft--; i++, first = 0) {
2047 unsigned long val;
2048
2049 if (write) {
2050 bool neg;
2051
2052 left -= proc_skip_spaces(&kbuf);
2053
2054 err = proc_get_long(&kbuf, &left, &val, &neg,
2055 proc_wspace_sep,
2056 sizeof(proc_wspace_sep), NULL);
2057 if (err)
2058 break;
2059 if (neg)
2060 continue;
2061 if ((min && val < *min) || (max && val > *max))
2062 continue;
2063 *i = val;
2064 } else {
2065 val = convdiv * (*i) / convmul;
2066 if (!first)
2067 err = proc_put_char(&buffer, &left, '\t');
2068 err = proc_put_long(&buffer, &left, val, false);
2069 if (err)
2070 break;
2071 }
2072 }
2073
2074 if (!write && !first && left && !err)
2075 err = proc_put_char(&buffer, &left, '\n');
2076 if (write && !err)
2077 left -= proc_skip_spaces(&kbuf);
2078 free:
2079 if (write) {
2080 free_page(page);
2081 if (first)
2082 return err ? : -EINVAL;
2083 }
2084 *lenp -= left;
2085 *ppos += *lenp;
2086 return err;
2087 }
2088
2089 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2090 void __user *buffer,
2091 size_t *lenp, loff_t *ppos,
2092 unsigned long convmul,
2093 unsigned long convdiv)
2094 {
2095 return __do_proc_doulongvec_minmax(table->data, table, write,
2096 buffer, lenp, ppos, convmul, convdiv);
2097 }
2098
2099 /**
2100 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2101 * @table: the sysctl table
2102 * @write: %TRUE if this is a write to the sysctl file
2103 * @buffer: the user buffer
2104 * @lenp: the size of the user buffer
2105 * @ppos: file position
2106 *
2107 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2108 * values from/to the user buffer, treated as an ASCII string.
2109 *
2110 * This routine will ensure the values are within the range specified by
2111 * table->extra1 (min) and table->extra2 (max).
2112 *
2113 * Returns 0 on success.
2114 */
2115 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2116 void __user *buffer, size_t *lenp, loff_t *ppos)
2117 {
2118 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2119 }
2120
2121 /**
2122 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2123 * @table: the sysctl table
2124 * @write: %TRUE if this is a write to the sysctl file
2125 * @buffer: the user buffer
2126 * @lenp: the size of the user buffer
2127 * @ppos: file position
2128 *
2129 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2130 * values from/to the user buffer, treated as an ASCII string. The values
2131 * are treated as milliseconds, and converted to jiffies when they are stored.
2132 *
2133 * This routine will ensure the values are within the range specified by
2134 * table->extra1 (min) and table->extra2 (max).
2135 *
2136 * Returns 0 on success.
2137 */
2138 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2139 void __user *buffer,
2140 size_t *lenp, loff_t *ppos)
2141 {
2142 return do_proc_doulongvec_minmax(table, write, buffer,
2143 lenp, ppos, HZ, 1000l);
2144 }
2145
2146
2147 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2148 int *valp,
2149 int write, void *data)
2150 {
2151 if (write) {
2152 if (*lvalp > LONG_MAX / HZ)
2153 return 1;
2154 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2155 } else {
2156 int val = *valp;
2157 unsigned long lval;
2158 if (val < 0) {
2159 *negp = true;
2160 lval = (unsigned long)-val;
2161 } else {
2162 *negp = false;
2163 lval = (unsigned long)val;
2164 }
2165 *lvalp = lval / HZ;
2166 }
2167 return 0;
2168 }
2169
2170 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2171 int *valp,
2172 int write, void *data)
2173 {
2174 if (write) {
2175 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2176 return 1;
2177 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2178 } else {
2179 int val = *valp;
2180 unsigned long lval;
2181 if (val < 0) {
2182 *negp = true;
2183 lval = (unsigned long)-val;
2184 } else {
2185 *negp = false;
2186 lval = (unsigned long)val;
2187 }
2188 *lvalp = jiffies_to_clock_t(lval);
2189 }
2190 return 0;
2191 }
2192
2193 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2194 int *valp,
2195 int write, void *data)
2196 {
2197 if (write) {
2198 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2199 } else {
2200 int val = *valp;
2201 unsigned long lval;
2202 if (val < 0) {
2203 *negp = true;
2204 lval = (unsigned long)-val;
2205 } else {
2206 *negp = false;
2207 lval = (unsigned long)val;
2208 }
2209 *lvalp = jiffies_to_msecs(lval);
2210 }
2211 return 0;
2212 }
2213
2214 /**
2215 * proc_dointvec_jiffies - read a vector of integers as seconds
2216 * @table: the sysctl table
2217 * @write: %TRUE if this is a write to the sysctl file
2218 * @buffer: the user buffer
2219 * @lenp: the size of the user buffer
2220 * @ppos: file position
2221 *
2222 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2223 * values from/to the user buffer, treated as an ASCII string.
2224 * The values read are assumed to be in seconds, and are converted into
2225 * jiffies.
2226 *
2227 * Returns 0 on success.
2228 */
2229 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2230 void __user *buffer, size_t *lenp, loff_t *ppos)
2231 {
2232 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2233 do_proc_dointvec_jiffies_conv,NULL);
2234 }
2235
2236 /**
2237 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2238 * @table: the sysctl table
2239 * @write: %TRUE if this is a write to the sysctl file
2240 * @buffer: the user buffer
2241 * @lenp: the size of the user buffer
2242 * @ppos: pointer to the file position
2243 *
2244 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2245 * values from/to the user buffer, treated as an ASCII string.
2246 * The values read are assumed to be in 1/USER_HZ seconds, and
2247 * are converted into jiffies.
2248 *
2249 * Returns 0 on success.
2250 */
2251 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2252 void __user *buffer, size_t *lenp, loff_t *ppos)
2253 {
2254 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2255 do_proc_dointvec_userhz_jiffies_conv,NULL);
2256 }
2257
2258 /**
2259 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2260 * @table: the sysctl table
2261 * @write: %TRUE if this is a write to the sysctl file
2262 * @buffer: the user buffer
2263 * @lenp: the size of the user buffer
2264 * @ppos: file position
2265 * @ppos: the current position in the file
2266 *
2267 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2268 * values from/to the user buffer, treated as an ASCII string.
2269 * The values read are assumed to be in 1/1000 seconds, and
2270 * are converted into jiffies.
2271 *
2272 * Returns 0 on success.
2273 */
2274 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2275 void __user *buffer, size_t *lenp, loff_t *ppos)
2276 {
2277 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2278 do_proc_dointvec_ms_jiffies_conv, NULL);
2279 }
2280
2281 static int proc_do_cad_pid(struct ctl_table *table, int write,
2282 void __user *buffer, size_t *lenp, loff_t *ppos)
2283 {
2284 struct pid *new_pid;
2285 pid_t tmp;
2286 int r;
2287
2288 tmp = pid_vnr(cad_pid);
2289
2290 r = __do_proc_dointvec(&tmp, table, write, buffer,
2291 lenp, ppos, NULL, NULL);
2292 if (r || !write)
2293 return r;
2294
2295 new_pid = find_get_pid(tmp);
2296 if (!new_pid)
2297 return -ESRCH;
2298
2299 put_pid(xchg(&cad_pid, new_pid));
2300 return 0;
2301 }
2302
2303 /**
2304 * proc_do_large_bitmap - read/write from/to a large bitmap
2305 * @table: the sysctl table
2306 * @write: %TRUE if this is a write to the sysctl file
2307 * @buffer: the user buffer
2308 * @lenp: the size of the user buffer
2309 * @ppos: file position
2310 *
2311 * The bitmap is stored at table->data and the bitmap length (in bits)
2312 * in table->maxlen.
2313 *
2314 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2315 * large bitmaps may be represented in a compact manner. Writing into
2316 * the file will clear the bitmap then update it with the given input.
2317 *
2318 * Returns 0 on success.
2319 */
2320 int proc_do_large_bitmap(struct ctl_table *table, int write,
2321 void __user *buffer, size_t *lenp, loff_t *ppos)
2322 {
2323 int err = 0;
2324 bool first = 1;
2325 size_t left = *lenp;
2326 unsigned long bitmap_len = table->maxlen;
2327 unsigned long *bitmap = (unsigned long *) table->data;
2328 unsigned long *tmp_bitmap = NULL;
2329 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2330
2331 if (!bitmap_len || !left || (*ppos && !write)) {
2332 *lenp = 0;
2333 return 0;
2334 }
2335
2336 if (write) {
2337 unsigned long page = 0;
2338 char *kbuf;
2339
2340 if (left > PAGE_SIZE - 1)
2341 left = PAGE_SIZE - 1;
2342
2343 page = __get_free_page(GFP_TEMPORARY);
2344 kbuf = (char *) page;
2345 if (!kbuf)
2346 return -ENOMEM;
2347 if (copy_from_user(kbuf, buffer, left)) {
2348 free_page(page);
2349 return -EFAULT;
2350 }
2351 kbuf[left] = 0;
2352
2353 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2354 GFP_KERNEL);
2355 if (!tmp_bitmap) {
2356 free_page(page);
2357 return -ENOMEM;
2358 }
2359 proc_skip_char(&kbuf, &left, '\n');
2360 while (!err && left) {
2361 unsigned long val_a, val_b;
2362 bool neg;
2363
2364 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2365 sizeof(tr_a), &c);
2366 if (err)
2367 break;
2368 if (val_a >= bitmap_len || neg) {
2369 err = -EINVAL;
2370 break;
2371 }
2372
2373 val_b = val_a;
2374 if (left) {
2375 kbuf++;
2376 left--;
2377 }
2378
2379 if (c == '-') {
2380 err = proc_get_long(&kbuf, &left, &val_b,
2381 &neg, tr_b, sizeof(tr_b),
2382 &c);
2383 if (err)
2384 break;
2385 if (val_b >= bitmap_len || neg ||
2386 val_a > val_b) {
2387 err = -EINVAL;
2388 break;
2389 }
2390 if (left) {
2391 kbuf++;
2392 left--;
2393 }
2394 }
2395
2396 while (val_a <= val_b)
2397 set_bit(val_a++, tmp_bitmap);
2398
2399 first = 0;
2400 proc_skip_char(&kbuf, &left, '\n');
2401 }
2402 free_page(page);
2403 } else {
2404 unsigned long bit_a, bit_b = 0;
2405
2406 while (left) {
2407 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2408 if (bit_a >= bitmap_len)
2409 break;
2410 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2411 bit_a + 1) - 1;
2412
2413 if (!first) {
2414 err = proc_put_char(&buffer, &left, ',');
2415 if (err)
2416 break;
2417 }
2418 err = proc_put_long(&buffer, &left, bit_a, false);
2419 if (err)
2420 break;
2421 if (bit_a != bit_b) {
2422 err = proc_put_char(&buffer, &left, '-');
2423 if (err)
2424 break;
2425 err = proc_put_long(&buffer, &left, bit_b, false);
2426 if (err)
2427 break;
2428 }
2429
2430 first = 0; bit_b++;
2431 }
2432 if (!err)
2433 err = proc_put_char(&buffer, &left, '\n');
2434 }
2435
2436 if (!err) {
2437 if (write) {
2438 if (*ppos)
2439 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2440 else
2441 memcpy(bitmap, tmp_bitmap,
2442 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2443 }
2444 kfree(tmp_bitmap);
2445 *lenp -= left;
2446 *ppos += *lenp;
2447 return 0;
2448 } else {
2449 kfree(tmp_bitmap);
2450 return err;
2451 }
2452 }
2453
2454 #else /* CONFIG_PROC_SYSCTL */
2455
2456 int proc_dostring(struct ctl_table *table, int write,
2457 void __user *buffer, size_t *lenp, loff_t *ppos)
2458 {
2459 return -ENOSYS;
2460 }
2461
2462 int proc_dointvec(struct ctl_table *table, int write,
2463 void __user *buffer, size_t *lenp, loff_t *ppos)
2464 {
2465 return -ENOSYS;
2466 }
2467
2468 int proc_dointvec_minmax(struct ctl_table *table, int write,
2469 void __user *buffer, size_t *lenp, loff_t *ppos)
2470 {
2471 return -ENOSYS;
2472 }
2473
2474 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2475 void __user *buffer, size_t *lenp, loff_t *ppos)
2476 {
2477 return -ENOSYS;
2478 }
2479
2480 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2481 void __user *buffer, size_t *lenp, loff_t *ppos)
2482 {
2483 return -ENOSYS;
2484 }
2485
2486 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2487 void __user *buffer, size_t *lenp, loff_t *ppos)
2488 {
2489 return -ENOSYS;
2490 }
2491
2492 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2493 void __user *buffer, size_t *lenp, loff_t *ppos)
2494 {
2495 return -ENOSYS;
2496 }
2497
2498 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2499 void __user *buffer,
2500 size_t *lenp, loff_t *ppos)
2501 {
2502 return -ENOSYS;
2503 }
2504
2505
2506 #endif /* CONFIG_PROC_SYSCTL */
2507
2508 /*
2509 * No sense putting this after each symbol definition, twice,
2510 * exception granted :-)
2511 */
2512 EXPORT_SYMBOL(proc_dointvec);
2513 EXPORT_SYMBOL(proc_dointvec_jiffies);
2514 EXPORT_SYMBOL(proc_dointvec_minmax);
2515 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2516 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2517 EXPORT_SYMBOL(proc_dostring);
2518 EXPORT_SYMBOL(proc_doulongvec_minmax);
2519 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux kernel - Deliverables
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