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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/proc_fs.h>
28#include <linux/security.h>
29#include <linux/ctype.h>
30#include <linux/kmemcheck.h>
31#include <linux/fs.h>
32#include <linux/init.h>
33#include <linux/kernel.h>
34#include <linux/kobject.h>
35#include <linux/net.h>
36#include <linux/sysrq.h>
37#include <linux/highuid.h>
38#include <linux/writeback.h>
39#include <linux/ratelimit.h>
40#include <linux/compaction.h>
41#include <linux/hugetlb.h>
42#include <linux/initrd.h>
43#include <linux/key.h>
44#include <linux/times.h>
45#include <linux/limits.h>
46#include <linux/dcache.h>
47#include <linux/dnotify.h>
48#include <linux/syscalls.h>
49#include <linux/vmstat.h>
50#include <linux/nfs_fs.h>
51#include <linux/acpi.h>
52#include <linux/reboot.h>
53#include <linux/ftrace.h>
54#include <linux/perf_event.h>
55#include <linux/kprobes.h>
56#include <linux/pipe_fs_i.h>
57#include <linux/oom.h>
58
59#include <asm/uaccess.h>
60#include <asm/processor.h>
61
62#ifdef CONFIG_X86
63#include <asm/nmi.h>
64#include <asm/stacktrace.h>
65#include <asm/io.h>
66#endif
67#ifdef CONFIG_BSD_PROCESS_ACCT
68#include <linux/acct.h>
69#endif
70#ifdef CONFIG_RT_MUTEXES
71#include <linux/rtmutex.h>
72#endif
73#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
74#include <linux/lockdep.h>
75#endif
76#ifdef CONFIG_CHR_DEV_SG
77#include <scsi/sg.h>
78#endif
79
80#ifdef CONFIG_LOCKUP_DETECTOR
81#include <linux/nmi.h>
82#endif
83
84
85#if defined(CONFIG_SYSCTL)
86
87
88extern int sysctl_overcommit_memory;
89extern int sysctl_overcommit_ratio;
90extern int max_threads;
91extern int core_uses_pid;
92extern int suid_dumpable;
93extern char core_pattern[];
94extern unsigned int core_pipe_limit;
95extern int pid_max;
96extern int min_free_kbytes;
97extern int pid_max_min, pid_max_max;
98extern int sysctl_drop_caches;
99extern int percpu_pagelist_fraction;
100extern int compat_log;
101extern int latencytop_enabled;
102extern int sysctl_nr_open_min, sysctl_nr_open_max;
103#ifndef CONFIG_MMU
104extern int sysctl_nr_trim_pages;
105#endif
106#ifdef CONFIG_BLOCK
107extern int blk_iopoll_enabled;
108#endif
109
110
111#ifdef CONFIG_LOCKUP_DETECTOR
112static int sixty = 60;
113static int neg_one = -1;
114#endif
115
116static int zero;
117static int __maybe_unused one = 1;
118static int __maybe_unused two = 2;
119static unsigned long one_ul = 1;
120static int one_hundred = 100;
121#ifdef CONFIG_PRINTK
122static int ten_thousand = 10000;
123#endif
124
125
126static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
127
128
129static int maxolduid = 65535;
130static int minolduid;
131static int min_percpu_pagelist_fract = 8;
132
133static int ngroups_max = NGROUPS_MAX;
134
135#ifdef CONFIG_INOTIFY_USER
136#include <linux/inotify.h>
137#endif
138#ifdef CONFIG_SPARC
139#include <asm/system.h>
140#endif
141
142#ifdef CONFIG_SPARC64
143extern int sysctl_tsb_ratio;
144#endif
145
146#ifdef __hppa__
147extern int pwrsw_enabled;
148extern int unaligned_enabled;
149#endif
150
151#ifdef CONFIG_S390
152#ifdef CONFIG_MATHEMU
153extern int sysctl_ieee_emulation_warnings;
154#endif
155extern int sysctl_userprocess_debug;
156extern int spin_retry;
157#endif
158
159#ifdef CONFIG_IA64
160extern int no_unaligned_warning;
161extern int unaligned_dump_stack;
162#endif
163
164#ifdef CONFIG_PROC_SYSCTL
165static int proc_do_cad_pid(struct ctl_table *table, int write,
166 void __user *buffer, size_t *lenp, loff_t *ppos);
167static int proc_taint(struct ctl_table *table, int write,
168 void __user *buffer, size_t *lenp, loff_t *ppos);
169#endif
170
171#ifdef CONFIG_MAGIC_SYSRQ
172static int __sysrq_enabled;
173
174static int sysrq_sysctl_handler(ctl_table *table, int write,
175 void __user *buffer, size_t *lenp,
176 loff_t *ppos)
177{
178 int error;
179
180 error = proc_dointvec(table, write, buffer, lenp, ppos);
181 if (error)
182 return error;
183
184 if (write)
185 sysrq_toggle_support(__sysrq_enabled);
186
187 return 0;
188}
189
190#endif
191
192static struct ctl_table root_table[];
193static struct ctl_table_root sysctl_table_root;
194static struct ctl_table_header root_table_header = {
195 .count = 1,
196 .ctl_table = root_table,
197 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
198 .root = &sysctl_table_root,
199 .set = &sysctl_table_root.default_set,
200};
201static struct ctl_table_root sysctl_table_root = {
202 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
203 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
204};
205
206static struct ctl_table kern_table[];
207static struct ctl_table vm_table[];
208static struct ctl_table fs_table[];
209static struct ctl_table debug_table[];
210static struct ctl_table dev_table[];
211extern struct ctl_table random_table[];
212#ifdef CONFIG_EPOLL
213extern struct ctl_table epoll_table[];
214#endif
215
216#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
217int sysctl_legacy_va_layout;
218#endif
219
220
221
222static struct ctl_table root_table[] = {
223 {
224 .procname = "kernel",
225 .mode = 0555,
226 .child = kern_table,
227 },
228 {
229 .procname = "vm",
230 .mode = 0555,
231 .child = vm_table,
232 },
233 {
234 .procname = "fs",
235 .mode = 0555,
236 .child = fs_table,
237 },
238 {
239 .procname = "debug",
240 .mode = 0555,
241 .child = debug_table,
242 },
243 {
244 .procname = "dev",
245 .mode = 0555,
246 .child = dev_table,
247 },
248
249
250
251
252 { }
253};
254
255#ifdef CONFIG_SCHED_DEBUG
256static int min_sched_granularity_ns = 100000;
257static int max_sched_granularity_ns = NSEC_PER_SEC;
258static int min_wakeup_granularity_ns;
259static int max_wakeup_granularity_ns = NSEC_PER_SEC;
260static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
261static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
262static int min_sched_shares_ratelimit = 100000;
263static int max_sched_shares_ratelimit = NSEC_PER_SEC;
264#endif
265
266#ifdef CONFIG_COMPACTION
267static int min_extfrag_threshold;
268static int max_extfrag_threshold = 1000;
269#endif
270
271static struct ctl_table kern_table[] = {
272 {
273 .procname = "sched_child_runs_first",
274 .data = &sysctl_sched_child_runs_first,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
277 .proc_handler = proc_dointvec,
278 },
279#ifdef CONFIG_SCHED_DEBUG
280 {
281 .procname = "sched_min_granularity_ns",
282 .data = &sysctl_sched_min_granularity,
283 .maxlen = sizeof(unsigned int),
284 .mode = 0644,
285 .proc_handler = sched_proc_update_handler,
286 .extra1 = &min_sched_granularity_ns,
287 .extra2 = &max_sched_granularity_ns,
288 },
289 {
290 .procname = "sched_latency_ns",
291 .data = &sysctl_sched_latency,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = sched_proc_update_handler,
295 .extra1 = &min_sched_granularity_ns,
296 .extra2 = &max_sched_granularity_ns,
297 },
298 {
299 .procname = "sched_wakeup_granularity_ns",
300 .data = &sysctl_sched_wakeup_granularity,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_wakeup_granularity_ns,
305 .extra2 = &max_wakeup_granularity_ns,
306 },
307 {
308 .procname = "sched_shares_ratelimit",
309 .data = &sysctl_sched_shares_ratelimit,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = sched_proc_update_handler,
313 .extra1 = &min_sched_shares_ratelimit,
314 .extra2 = &max_sched_shares_ratelimit,
315 },
316 {
317 .procname = "sched_tunable_scaling",
318 .data = &sysctl_sched_tunable_scaling,
319 .maxlen = sizeof(enum sched_tunable_scaling),
320 .mode = 0644,
321 .proc_handler = sched_proc_update_handler,
322 .extra1 = &min_sched_tunable_scaling,
323 .extra2 = &max_sched_tunable_scaling,
324 },
325 {
326 .procname = "sched_shares_thresh",
327 .data = &sysctl_sched_shares_thresh,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec_minmax,
331 .extra1 = &zero,
332 },
333 {
334 .procname = "sched_migration_cost",
335 .data = &sysctl_sched_migration_cost,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "sched_nr_migrate",
342 .data = &sysctl_sched_nr_migrate,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
347 {
348 .procname = "sched_time_avg",
349 .data = &sysctl_sched_time_avg,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec,
353 },
354 {
355 .procname = "timer_migration",
356 .data = &sysctl_timer_migration,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec_minmax,
360 .extra1 = &zero,
361 .extra2 = &one,
362 },
363#endif
364 {
365 .procname = "sched_rt_period_us",
366 .data = &sysctl_sched_rt_period,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = sched_rt_handler,
370 },
371 {
372 .procname = "sched_rt_runtime_us",
373 .data = &sysctl_sched_rt_runtime,
374 .maxlen = sizeof(int),
375 .mode = 0644,
376 .proc_handler = sched_rt_handler,
377 },
378 {
379 .procname = "sched_compat_yield",
380 .data = &sysctl_sched_compat_yield,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec,
384 },
385#ifdef CONFIG_PROVE_LOCKING
386 {
387 .procname = "prove_locking",
388 .data = &prove_locking,
389 .maxlen = sizeof(int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393#endif
394#ifdef CONFIG_LOCK_STAT
395 {
396 .procname = "lock_stat",
397 .data = &lock_stat,
398 .maxlen = sizeof(int),
399 .mode = 0644,
400 .proc_handler = proc_dointvec,
401 },
402#endif
403 {
404 .procname = "panic",
405 .data = &panic_timeout,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = proc_dointvec,
409 },
410 {
411 .procname = "core_uses_pid",
412 .data = &core_uses_pid,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = proc_dointvec,
416 },
417 {
418 .procname = "core_pattern",
419 .data = core_pattern,
420 .maxlen = CORENAME_MAX_SIZE,
421 .mode = 0644,
422 .proc_handler = proc_dostring,
423 },
424 {
425 .procname = "core_pipe_limit",
426 .data = &core_pipe_limit,
427 .maxlen = sizeof(unsigned int),
428 .mode = 0644,
429 .proc_handler = proc_dointvec,
430 },
431#ifdef CONFIG_PROC_SYSCTL
432 {
433 .procname = "tainted",
434 .maxlen = sizeof(long),
435 .mode = 0644,
436 .proc_handler = proc_taint,
437 },
438#endif
439#ifdef CONFIG_LATENCYTOP
440 {
441 .procname = "latencytop",
442 .data = &latencytop_enabled,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec,
446 },
447#endif
448#ifdef CONFIG_BLK_DEV_INITRD
449 {
450 .procname = "real-root-dev",
451 .data = &real_root_dev,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec,
455 },
456#endif
457 {
458 .procname = "print-fatal-signals",
459 .data = &print_fatal_signals,
460 .maxlen = sizeof(int),
461 .mode = 0644,
462 .proc_handler = proc_dointvec,
463 },
464#ifdef CONFIG_SPARC
465 {
466 .procname = "reboot-cmd",
467 .data = reboot_command,
468 .maxlen = 256,
469 .mode = 0644,
470 .proc_handler = proc_dostring,
471 },
472 {
473 .procname = "stop-a",
474 .data = &stop_a_enabled,
475 .maxlen = sizeof (int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec,
478 },
479 {
480 .procname = "scons-poweroff",
481 .data = &scons_pwroff,
482 .maxlen = sizeof (int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486#endif
487#ifdef CONFIG_SPARC64
488 {
489 .procname = "tsb-ratio",
490 .data = &sysctl_tsb_ratio,
491 .maxlen = sizeof (int),
492 .mode = 0644,
493 .proc_handler = proc_dointvec,
494 },
495#endif
496#ifdef __hppa__
497 {
498 .procname = "soft-power",
499 .data = &pwrsw_enabled,
500 .maxlen = sizeof (int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec,
503 },
504 {
505 .procname = "unaligned-trap",
506 .data = &unaligned_enabled,
507 .maxlen = sizeof (int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec,
510 },
511#endif
512 {
513 .procname = "ctrl-alt-del",
514 .data = &C_A_D,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519#ifdef CONFIG_FUNCTION_TRACER
520 {
521 .procname = "ftrace_enabled",
522 .data = &ftrace_enabled,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = ftrace_enable_sysctl,
526 },
527#endif
528#ifdef CONFIG_STACK_TRACER
529 {
530 .procname = "stack_tracer_enabled",
531 .data = &stack_tracer_enabled,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = stack_trace_sysctl,
535 },
536#endif
537#ifdef CONFIG_TRACING
538 {
539 .procname = "ftrace_dump_on_oops",
540 .data = &ftrace_dump_on_oops,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = proc_dointvec,
544 },
545#endif
546#ifdef CONFIG_MODULES
547 {
548 .procname = "modprobe",
549 .data = &modprobe_path,
550 .maxlen = KMOD_PATH_LEN,
551 .mode = 0644,
552 .proc_handler = proc_dostring,
553 },
554 {
555 .procname = "modules_disabled",
556 .data = &modules_disabled,
557 .maxlen = sizeof(int),
558 .mode = 0644,
559
560 .proc_handler = proc_dointvec_minmax,
561 .extra1 = &one,
562 .extra2 = &one,
563 },
564#endif
565#ifdef CONFIG_HOTPLUG
566 {
567 .procname = "hotplug",
568 .data = &uevent_helper,
569 .maxlen = UEVENT_HELPER_PATH_LEN,
570 .mode = 0644,
571 .proc_handler = proc_dostring,
572 },
573#endif
574#ifdef CONFIG_CHR_DEV_SG
575 {
576 .procname = "sg-big-buff",
577 .data = &sg_big_buff,
578 .maxlen = sizeof (int),
579 .mode = 0444,
580 .proc_handler = proc_dointvec,
581 },
582#endif
583#ifdef CONFIG_BSD_PROCESS_ACCT
584 {
585 .procname = "acct",
586 .data = &acct_parm,
587 .maxlen = 3*sizeof(int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec,
590 },
591#endif
592#ifdef CONFIG_MAGIC_SYSRQ
593 {
594 .procname = "sysrq",
595 .data = &__sysrq_enabled,
596 .maxlen = sizeof (int),
597 .mode = 0644,
598 .proc_handler = sysrq_sysctl_handler,
599 },
600#endif
601#ifdef CONFIG_PROC_SYSCTL
602 {
603 .procname = "cad_pid",
604 .data = NULL,
605 .maxlen = sizeof (int),
606 .mode = 0600,
607 .proc_handler = proc_do_cad_pid,
608 },
609#endif
610 {
611 .procname = "threads-max",
612 .data = &max_threads,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
617 {
618 .procname = "random",
619 .mode = 0555,
620 .child = random_table,
621 },
622 {
623 .procname = "overflowuid",
624 .data = &overflowuid,
625 .maxlen = sizeof(int),
626 .mode = 0644,
627 .proc_handler = proc_dointvec_minmax,
628 .extra1 = &minolduid,
629 .extra2 = &maxolduid,
630 },
631 {
632 .procname = "overflowgid",
633 .data = &overflowgid,
634 .maxlen = sizeof(int),
635 .mode = 0644,
636 .proc_handler = proc_dointvec_minmax,
637 .extra1 = &minolduid,
638 .extra2 = &maxolduid,
639 },
640#ifdef CONFIG_S390
641#ifdef CONFIG_MATHEMU
642 {
643 .procname = "ieee_emulation_warnings",
644 .data = &sysctl_ieee_emulation_warnings,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec,
648 },
649#endif
650 {
651 .procname = "userprocess_debug",
652 .data = &show_unhandled_signals,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec,
656 },
657#endif
658 {
659 .procname = "pid_max",
660 .data = &pid_max,
661 .maxlen = sizeof (int),
662 .mode = 0644,
663 .proc_handler = proc_dointvec_minmax,
664 .extra1 = &pid_max_min,
665 .extra2 = &pid_max_max,
666 },
667 {
668 .procname = "panic_on_oops",
669 .data = &panic_on_oops,
670 .maxlen = sizeof(int),
671 .mode = 0644,
672 .proc_handler = proc_dointvec,
673 },
674#if defined CONFIG_PRINTK
675 {
676 .procname = "printk",
677 .data = &console_loglevel,
678 .maxlen = 4*sizeof(int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec,
681 },
682 {
683 .procname = "printk_ratelimit",
684 .data = &printk_ratelimit_state.interval,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec_jiffies,
688 },
689 {
690 .procname = "printk_ratelimit_burst",
691 .data = &printk_ratelimit_state.burst,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec,
695 },
696 {
697 .procname = "printk_delay",
698 .data = &printk_delay_msec,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 .proc_handler = proc_dointvec_minmax,
702 .extra1 = &zero,
703 .extra2 = &ten_thousand,
704 },
705 {
706 .procname = "dmesg_restrict",
707 .data = &dmesg_restrict,
708 .maxlen = sizeof(int),
709 .mode = 0644,
710 .proc_handler = proc_dointvec_minmax,
711 .extra1 = &zero,
712 .extra2 = &one,
713 },
714#endif
715 {
716 .procname = "ngroups_max",
717 .data = &ngroups_max,
718 .maxlen = sizeof (int),
719 .mode = 0444,
720 .proc_handler = proc_dointvec,
721 },
722#if defined(CONFIG_LOCKUP_DETECTOR)
723 {
724 .procname = "watchdog",
725 .data = &watchdog_enabled,
726 .maxlen = sizeof (int),
727 .mode = 0644,
728 .proc_handler = proc_dowatchdog_enabled,
729 },
730 {
731 .procname = "watchdog_thresh",
732 .data = &softlockup_thresh,
733 .maxlen = sizeof(int),
734 .mode = 0644,
735 .proc_handler = proc_dowatchdog_thresh,
736 .extra1 = &neg_one,
737 .extra2 = &sixty,
738 },
739 {
740 .procname = "softlockup_panic",
741 .data = &softlockup_panic,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = proc_dointvec_minmax,
745 .extra1 = &zero,
746 .extra2 = &one,
747 },
748#endif
749#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR)
750 {
751 .procname = "unknown_nmi_panic",
752 .data = &unknown_nmi_panic,
753 .maxlen = sizeof (int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec,
756 },
757 {
758 .procname = "nmi_watchdog",
759 .data = &nmi_watchdog_enabled,
760 .maxlen = sizeof (int),
761 .mode = 0644,
762 .proc_handler = proc_nmi_enabled,
763 },
764#endif
765#if defined(CONFIG_X86)
766 {
767 .procname = "panic_on_unrecovered_nmi",
768 .data = &panic_on_unrecovered_nmi,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec,
772 },
773 {
774 .procname = "panic_on_io_nmi",
775 .data = &panic_on_io_nmi,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec,
779 },
780 {
781 .procname = "bootloader_type",
782 .data = &bootloader_type,
783 .maxlen = sizeof (int),
784 .mode = 0444,
785 .proc_handler = proc_dointvec,
786 },
787 {
788 .procname = "bootloader_version",
789 .data = &bootloader_version,
790 .maxlen = sizeof (int),
791 .mode = 0444,
792 .proc_handler = proc_dointvec,
793 },
794 {
795 .procname = "kstack_depth_to_print",
796 .data = &kstack_depth_to_print,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec,
800 },
801 {
802 .procname = "io_delay_type",
803 .data = &io_delay_type,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec,
807 },
808#endif
809#if defined(CONFIG_MMU)
810 {
811 .procname = "randomize_va_space",
812 .data = &randomize_va_space,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec,
816 },
817#endif
818#if defined(CONFIG_S390) && defined(CONFIG_SMP)
819 {
820 .procname = "spin_retry",
821 .data = &spin_retry,
822 .maxlen = sizeof (int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec,
825 },
826#endif
827#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
828 {
829 .procname = "acpi_video_flags",
830 .data = &acpi_realmode_flags,
831 .maxlen = sizeof (unsigned long),
832 .mode = 0644,
833 .proc_handler = proc_doulongvec_minmax,
834 },
835#endif
836#ifdef CONFIG_IA64
837 {
838 .procname = "ignore-unaligned-usertrap",
839 .data = &no_unaligned_warning,
840 .maxlen = sizeof (int),
841 .mode = 0644,
842 .proc_handler = proc_dointvec,
843 },
844 {
845 .procname = "unaligned-dump-stack",
846 .data = &unaligned_dump_stack,
847 .maxlen = sizeof (int),
848 .mode = 0644,
849 .proc_handler = proc_dointvec,
850 },
851#endif
852#ifdef CONFIG_DETECT_HUNG_TASK
853 {
854 .procname = "hung_task_panic",
855 .data = &sysctl_hung_task_panic,
856 .maxlen = sizeof(int),
857 .mode = 0644,
858 .proc_handler = proc_dointvec_minmax,
859 .extra1 = &zero,
860 .extra2 = &one,
861 },
862 {
863 .procname = "hung_task_check_count",
864 .data = &sysctl_hung_task_check_count,
865 .maxlen = sizeof(unsigned long),
866 .mode = 0644,
867 .proc_handler = proc_doulongvec_minmax,
868 },
869 {
870 .procname = "hung_task_timeout_secs",
871 .data = &sysctl_hung_task_timeout_secs,
872 .maxlen = sizeof(unsigned long),
873 .mode = 0644,
874 .proc_handler = proc_dohung_task_timeout_secs,
875 },
876 {
877 .procname = "hung_task_warnings",
878 .data = &sysctl_hung_task_warnings,
879 .maxlen = sizeof(unsigned long),
880 .mode = 0644,
881 .proc_handler = proc_doulongvec_minmax,
882 },
883#endif
884#ifdef CONFIG_COMPAT
885 {
886 .procname = "compat-log",
887 .data = &compat_log,
888 .maxlen = sizeof (int),
889 .mode = 0644,
890 .proc_handler = proc_dointvec,
891 },
892#endif
893#ifdef CONFIG_RT_MUTEXES
894 {
895 .procname = "max_lock_depth",
896 .data = &max_lock_depth,
897 .maxlen = sizeof(int),
898 .mode = 0644,
899 .proc_handler = proc_dointvec,
900 },
901#endif
902 {
903 .procname = "poweroff_cmd",
904 .data = &poweroff_cmd,
905 .maxlen = POWEROFF_CMD_PATH_LEN,
906 .mode = 0644,
907 .proc_handler = proc_dostring,
908 },
909#ifdef CONFIG_KEYS
910 {
911 .procname = "keys",
912 .mode = 0555,
913 .child = key_sysctls,
914 },
915#endif
916#ifdef CONFIG_RCU_TORTURE_TEST
917 {
918 .procname = "rcutorture_runnable",
919 .data = &rcutorture_runnable,
920 .maxlen = sizeof(int),
921 .mode = 0644,
922 .proc_handler = proc_dointvec,
923 },
924#endif
925#ifdef CONFIG_PERF_EVENTS
926 {
927 .procname = "perf_event_paranoid",
928 .data = &sysctl_perf_event_paranoid,
929 .maxlen = sizeof(sysctl_perf_event_paranoid),
930 .mode = 0644,
931 .proc_handler = proc_dointvec,
932 },
933 {
934 .procname = "perf_event_mlock_kb",
935 .data = &sysctl_perf_event_mlock,
936 .maxlen = sizeof(sysctl_perf_event_mlock),
937 .mode = 0644,
938 .proc_handler = proc_dointvec,
939 },
940 {
941 .procname = "perf_event_max_sample_rate",
942 .data = &sysctl_perf_event_sample_rate,
943 .maxlen = sizeof(sysctl_perf_event_sample_rate),
944 .mode = 0644,
945 .proc_handler = proc_dointvec,
946 },
947#endif
948#ifdef CONFIG_KMEMCHECK
949 {
950 .procname = "kmemcheck",
951 .data = &kmemcheck_enabled,
952 .maxlen = sizeof(int),
953 .mode = 0644,
954 .proc_handler = proc_dointvec,
955 },
956#endif
957#ifdef CONFIG_BLOCK
958 {
959 .procname = "blk_iopoll",
960 .data = &blk_iopoll_enabled,
961 .maxlen = sizeof(int),
962 .mode = 0644,
963 .proc_handler = proc_dointvec,
964 },
965#endif
966
967
968
969
970 { }
971};
972
973static struct ctl_table vm_table[] = {
974 {
975 .procname = "overcommit_memory",
976 .data = &sysctl_overcommit_memory,
977 .maxlen = sizeof(sysctl_overcommit_memory),
978 .mode = 0644,
979 .proc_handler = proc_dointvec,
980 },
981 {
982 .procname = "panic_on_oom",
983 .data = &sysctl_panic_on_oom,
984 .maxlen = sizeof(sysctl_panic_on_oom),
985 .mode = 0644,
986 .proc_handler = proc_dointvec,
987 },
988 {
989 .procname = "oom_kill_allocating_task",
990 .data = &sysctl_oom_kill_allocating_task,
991 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
992 .mode = 0644,
993 .proc_handler = proc_dointvec,
994 },
995 {
996 .procname = "oom_dump_tasks",
997 .data = &sysctl_oom_dump_tasks,
998 .maxlen = sizeof(sysctl_oom_dump_tasks),
999 .mode = 0644,
1000 .proc_handler = proc_dointvec,
1001 },
1002 {
1003 .procname = "overcommit_ratio",
1004 .data = &sysctl_overcommit_ratio,
1005 .maxlen = sizeof(sysctl_overcommit_ratio),
1006 .mode = 0644,
1007 .proc_handler = proc_dointvec,
1008 },
1009 {
1010 .procname = "page-cluster",
1011 .data = &page_cluster,
1012 .maxlen = sizeof(int),
1013 .mode = 0644,
1014 .proc_handler = proc_dointvec,
1015 },
1016 {
1017 .procname = "dirty_background_ratio",
1018 .data = &dirty_background_ratio,
1019 .maxlen = sizeof(dirty_background_ratio),
1020 .mode = 0644,
1021 .proc_handler = dirty_background_ratio_handler,
1022 .extra1 = &zero,
1023 .extra2 = &one_hundred,
1024 },
1025 {
1026 .procname = "dirty_background_bytes",
1027 .data = &dirty_background_bytes,
1028 .maxlen = sizeof(dirty_background_bytes),
1029 .mode = 0644,
1030 .proc_handler = dirty_background_bytes_handler,
1031 .extra1 = &one_ul,
1032 },
1033 {
1034 .procname = "dirty_ratio",
1035 .data = &vm_dirty_ratio,
1036 .maxlen = sizeof(vm_dirty_ratio),
1037 .mode = 0644,
1038 .proc_handler = dirty_ratio_handler,
1039 .extra1 = &zero,
1040 .extra2 = &one_hundred,
1041 },
1042 {
1043 .procname = "dirty_bytes",
1044 .data = &vm_dirty_bytes,
1045 .maxlen = sizeof(vm_dirty_bytes),
1046 .mode = 0644,
1047 .proc_handler = dirty_bytes_handler,
1048 .extra1 = &dirty_bytes_min,
1049 },
1050 {
1051 .procname = "dirty_writeback_centisecs",
1052 .data = &dirty_writeback_interval,
1053 .maxlen = sizeof(dirty_writeback_interval),
1054 .mode = 0644,
1055 .proc_handler = dirty_writeback_centisecs_handler,
1056 },
1057 {
1058 .procname = "dirty_expire_centisecs",
1059 .data = &dirty_expire_interval,
1060 .maxlen = sizeof(dirty_expire_interval),
1061 .mode = 0644,
1062 .proc_handler = proc_dointvec,
1063 },
1064 {
1065 .procname = "nr_pdflush_threads",
1066 .data = &nr_pdflush_threads,
1067 .maxlen = sizeof nr_pdflush_threads,
1068 .mode = 0444 ,
1069 .proc_handler = proc_dointvec,
1070 },
1071 {
1072 .procname = "swappiness",
1073 .data = &vm_swappiness,
1074 .maxlen = sizeof(vm_swappiness),
1075 .mode = 0644,
1076 .proc_handler = proc_dointvec_minmax,
1077 .extra1 = &zero,
1078 .extra2 = &one_hundred,
1079 },
1080#ifdef CONFIG_HUGETLB_PAGE
1081 {
1082 .procname = "nr_hugepages",
1083 .data = NULL,
1084 .maxlen = sizeof(unsigned long),
1085 .mode = 0644,
1086 .proc_handler = hugetlb_sysctl_handler,
1087 .extra1 = (void *)&hugetlb_zero,
1088 .extra2 = (void *)&hugetlb_infinity,
1089 },
1090#ifdef CONFIG_NUMA
1091 {
1092 .procname = "nr_hugepages_mempolicy",
1093 .data = NULL,
1094 .maxlen = sizeof(unsigned long),
1095 .mode = 0644,
1096 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1097 .extra1 = (void *)&hugetlb_zero,
1098 .extra2 = (void *)&hugetlb_infinity,
1099 },
1100#endif
1101 {
1102 .procname = "hugetlb_shm_group",
1103 .data = &sysctl_hugetlb_shm_group,
1104 .maxlen = sizeof(gid_t),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec,
1107 },
1108 {
1109 .procname = "hugepages_treat_as_movable",
1110 .data = &hugepages_treat_as_movable,
1111 .maxlen = sizeof(int),
1112 .mode = 0644,
1113 .proc_handler = hugetlb_treat_movable_handler,
1114 },
1115 {
1116 .procname = "nr_overcommit_hugepages",
1117 .data = NULL,
1118 .maxlen = sizeof(unsigned long),
1119 .mode = 0644,
1120 .proc_handler = hugetlb_overcommit_handler,
1121 .extra1 = (void *)&hugetlb_zero,
1122 .extra2 = (void *)&hugetlb_infinity,
1123 },
1124#endif
1125 {
1126 .procname = "lowmem_reserve_ratio",
1127 .data = &sysctl_lowmem_reserve_ratio,
1128 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1129 .mode = 0644,
1130 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1131 },
1132 {
1133 .procname = "drop_caches",
1134 .data = &sysctl_drop_caches,
1135 .maxlen = sizeof(int),
1136 .mode = 0644,
1137 .proc_handler = drop_caches_sysctl_handler,
1138 },
1139#ifdef CONFIG_COMPACTION
1140 {
1141 .procname = "compact_memory",
1142 .data = &sysctl_compact_memory,
1143 .maxlen = sizeof(int),
1144 .mode = 0200,
1145 .proc_handler = sysctl_compaction_handler,
1146 },
1147 {
1148 .procname = "extfrag_threshold",
1149 .data = &sysctl_extfrag_threshold,
1150 .maxlen = sizeof(int),
1151 .mode = 0644,
1152 .proc_handler = sysctl_extfrag_handler,
1153 .extra1 = &min_extfrag_threshold,
1154 .extra2 = &max_extfrag_threshold,
1155 },
1156
1157#endif
1158 {
1159 .procname = "min_free_kbytes",
1160 .data = &min_free_kbytes,
1161 .maxlen = sizeof(min_free_kbytes),
1162 .mode = 0644,
1163 .proc_handler = min_free_kbytes_sysctl_handler,
1164 .extra1 = &zero,
1165 },
1166 {
1167 .procname = "percpu_pagelist_fraction",
1168 .data = &percpu_pagelist_fraction,
1169 .maxlen = sizeof(percpu_pagelist_fraction),
1170 .mode = 0644,
1171 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1172 .extra1 = &min_percpu_pagelist_fract,
1173 },
1174#ifdef CONFIG_MMU
1175 {
1176 .procname = "max_map_count",
1177 .data = &sysctl_max_map_count,
1178 .maxlen = sizeof(sysctl_max_map_count),
1179 .mode = 0644,
1180 .proc_handler = proc_dointvec_minmax,
1181 .extra1 = &zero,
1182 },
1183#else
1184 {
1185 .procname = "nr_trim_pages",
1186 .data = &sysctl_nr_trim_pages,
1187 .maxlen = sizeof(sysctl_nr_trim_pages),
1188 .mode = 0644,
1189 .proc_handler = proc_dointvec_minmax,
1190 .extra1 = &zero,
1191 },
1192#endif
1193 {
1194 .procname = "laptop_mode",
1195 .data = &laptop_mode,
1196 .maxlen = sizeof(laptop_mode),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_jiffies,
1199 },
1200 {
1201 .procname = "block_dump",
1202 .data = &block_dump,
1203 .maxlen = sizeof(block_dump),
1204 .mode = 0644,
1205 .proc_handler = proc_dointvec,
1206 .extra1 = &zero,
1207 },
1208 {
1209 .procname = "vfs_cache_pressure",
1210 .data = &sysctl_vfs_cache_pressure,
1211 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1212 .mode = 0644,
1213 .proc_handler = proc_dointvec,
1214 .extra1 = &zero,
1215 },
1216#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1217 {
1218 .procname = "legacy_va_layout",
1219 .data = &sysctl_legacy_va_layout,
1220 .maxlen = sizeof(sysctl_legacy_va_layout),
1221 .mode = 0644,
1222 .proc_handler = proc_dointvec,
1223 .extra1 = &zero,
1224 },
1225#endif
1226#ifdef CONFIG_NUMA
1227 {
1228 .procname = "zone_reclaim_mode",
1229 .data = &zone_reclaim_mode,
1230 .maxlen = sizeof(zone_reclaim_mode),
1231 .mode = 0644,
1232 .proc_handler = proc_dointvec,
1233 .extra1 = &zero,
1234 },
1235 {
1236 .procname = "min_unmapped_ratio",
1237 .data = &sysctl_min_unmapped_ratio,
1238 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1239 .mode = 0644,
1240 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1241 .extra1 = &zero,
1242 .extra2 = &one_hundred,
1243 },
1244 {
1245 .procname = "min_slab_ratio",
1246 .data = &sysctl_min_slab_ratio,
1247 .maxlen = sizeof(sysctl_min_slab_ratio),
1248 .mode = 0644,
1249 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1250 .extra1 = &zero,
1251 .extra2 = &one_hundred,
1252 },
1253#endif
1254#ifdef CONFIG_SMP
1255 {
1256 .procname = "stat_interval",
1257 .data = &sysctl_stat_interval,
1258 .maxlen = sizeof(sysctl_stat_interval),
1259 .mode = 0644,
1260 .proc_handler = proc_dointvec_jiffies,
1261 },
1262#endif
1263#ifdef CONFIG_MMU
1264 {
1265 .procname = "mmap_min_addr",
1266 .data = &dac_mmap_min_addr,
1267 .maxlen = sizeof(unsigned long),
1268 .mode = 0644,
1269 .proc_handler = mmap_min_addr_handler,
1270 },
1271#endif
1272#ifdef CONFIG_NUMA
1273 {
1274 .procname = "numa_zonelist_order",
1275 .data = &numa_zonelist_order,
1276 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1277 .mode = 0644,
1278 .proc_handler = numa_zonelist_order_handler,
1279 },
1280#endif
1281#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1282 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1283 {
1284 .procname = "vdso_enabled",
1285 .data = &vdso_enabled,
1286 .maxlen = sizeof(vdso_enabled),
1287 .mode = 0644,
1288 .proc_handler = proc_dointvec,
1289 .extra1 = &zero,
1290 },
1291#endif
1292#ifdef CONFIG_HIGHMEM
1293 {
1294 .procname = "highmem_is_dirtyable",
1295 .data = &vm_highmem_is_dirtyable,
1296 .maxlen = sizeof(vm_highmem_is_dirtyable),
1297 .mode = 0644,
1298 .proc_handler = proc_dointvec_minmax,
1299 .extra1 = &zero,
1300 .extra2 = &one,
1301 },
1302#endif
1303 {
1304 .procname = "scan_unevictable_pages",
1305 .data = &scan_unevictable_pages,
1306 .maxlen = sizeof(scan_unevictable_pages),
1307 .mode = 0644,
1308 .proc_handler = scan_unevictable_handler,
1309 },
1310#ifdef CONFIG_MEMORY_FAILURE
1311 {
1312 .procname = "memory_failure_early_kill",
1313 .data = &sysctl_memory_failure_early_kill,
1314 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1315 .mode = 0644,
1316 .proc_handler = proc_dointvec_minmax,
1317 .extra1 = &zero,
1318 .extra2 = &one,
1319 },
1320 {
1321 .procname = "memory_failure_recovery",
1322 .data = &sysctl_memory_failure_recovery,
1323 .maxlen = sizeof(sysctl_memory_failure_recovery),
1324 .mode = 0644,
1325 .proc_handler = proc_dointvec_minmax,
1326 .extra1 = &zero,
1327 .extra2 = &one,
1328 },
1329#endif
1330
1331
1332
1333
1334
1335 { }
1336};
1337
1338#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1339static struct ctl_table binfmt_misc_table[] = {
1340 { }
1341};
1342#endif
1343
1344static struct ctl_table fs_table[] = {
1345 {
1346 .procname = "inode-nr",
1347 .data = &inodes_stat,
1348 .maxlen = 2*sizeof(int),
1349 .mode = 0444,
1350 .proc_handler = proc_nr_inodes,
1351 },
1352 {
1353 .procname = "inode-state",
1354 .data = &inodes_stat,
1355 .maxlen = 7*sizeof(int),
1356 .mode = 0444,
1357 .proc_handler = proc_nr_inodes,
1358 },
1359 {
1360 .procname = "file-nr",
1361 .data = &files_stat,
1362 .maxlen = sizeof(files_stat),
1363 .mode = 0444,
1364 .proc_handler = proc_nr_files,
1365 },
1366 {
1367 .procname = "file-max",
1368 .data = &files_stat.max_files,
1369 .maxlen = sizeof(files_stat.max_files),
1370 .mode = 0644,
1371 .proc_handler = proc_doulongvec_minmax,
1372 },
1373 {
1374 .procname = "nr_open",
1375 .data = &sysctl_nr_open,
1376 .maxlen = sizeof(int),
1377 .mode = 0644,
1378 .proc_handler = proc_dointvec_minmax,
1379 .extra1 = &sysctl_nr_open_min,
1380 .extra2 = &sysctl_nr_open_max,
1381 },
1382 {
1383 .procname = "dentry-state",
1384 .data = &dentry_stat,
1385 .maxlen = 6*sizeof(int),
1386 .mode = 0444,
1387 .proc_handler = proc_nr_dentry,
1388 },
1389 {
1390 .procname = "overflowuid",
1391 .data = &fs_overflowuid,
1392 .maxlen = sizeof(int),
1393 .mode = 0644,
1394 .proc_handler = proc_dointvec_minmax,
1395 .extra1 = &minolduid,
1396 .extra2 = &maxolduid,
1397 },
1398 {
1399 .procname = "overflowgid",
1400 .data = &fs_overflowgid,
1401 .maxlen = sizeof(int),
1402 .mode = 0644,
1403 .proc_handler = proc_dointvec_minmax,
1404 .extra1 = &minolduid,
1405 .extra2 = &maxolduid,
1406 },
1407#ifdef CONFIG_FILE_LOCKING
1408 {
1409 .procname = "leases-enable",
1410 .data = &leases_enable,
1411 .maxlen = sizeof(int),
1412 .mode = 0644,
1413 .proc_handler = proc_dointvec,
1414 },
1415#endif
1416#ifdef CONFIG_DNOTIFY
1417 {
1418 .procname = "dir-notify-enable",
1419 .data = &dir_notify_enable,
1420 .maxlen = sizeof(int),
1421 .mode = 0644,
1422 .proc_handler = proc_dointvec,
1423 },
1424#endif
1425#ifdef CONFIG_MMU
1426#ifdef CONFIG_FILE_LOCKING
1427 {
1428 .procname = "lease-break-time",
1429 .data = &lease_break_time,
1430 .maxlen = sizeof(int),
1431 .mode = 0644,
1432 .proc_handler = proc_dointvec,
1433 },
1434#endif
1435#ifdef CONFIG_AIO
1436 {
1437 .procname = "aio-nr",
1438 .data = &aio_nr,
1439 .maxlen = sizeof(aio_nr),
1440 .mode = 0444,
1441 .proc_handler = proc_doulongvec_minmax,
1442 },
1443 {
1444 .procname = "aio-max-nr",
1445 .data = &aio_max_nr,
1446 .maxlen = sizeof(aio_max_nr),
1447 .mode = 0644,
1448 .proc_handler = proc_doulongvec_minmax,
1449 },
1450#endif
1451#ifdef CONFIG_INOTIFY_USER
1452 {
1453 .procname = "inotify",
1454 .mode = 0555,
1455 .child = inotify_table,
1456 },
1457#endif
1458#ifdef CONFIG_EPOLL
1459 {
1460 .procname = "epoll",
1461 .mode = 0555,
1462 .child = epoll_table,
1463 },
1464#endif
1465#endif
1466 {
1467 .procname = "suid_dumpable",
1468 .data = &suid_dumpable,
1469 .maxlen = sizeof(int),
1470 .mode = 0644,
1471 .proc_handler = proc_dointvec_minmax,
1472 .extra1 = &zero,
1473 .extra2 = &two,
1474 },
1475#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1476 {
1477 .procname = "binfmt_misc",
1478 .mode = 0555,
1479 .child = binfmt_misc_table,
1480 },
1481#endif
1482 {
1483 .procname = "pipe-max-size",
1484 .data = &pipe_max_size,
1485 .maxlen = sizeof(int),
1486 .mode = 0644,
1487 .proc_handler = &pipe_proc_fn,
1488 .extra1 = &pipe_min_size,
1489 },
1490
1491
1492
1493
1494 { }
1495};
1496
1497static struct ctl_table debug_table[] = {
1498#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1499 defined(CONFIG_S390)
1500 {
1501 .procname = "exception-trace",
1502 .data = &show_unhandled_signals,
1503 .maxlen = sizeof(int),
1504 .mode = 0644,
1505 .proc_handler = proc_dointvec
1506 },
1507#endif
1508#if defined(CONFIG_OPTPROBES)
1509 {
1510 .procname = "kprobes-optimization",
1511 .data = &sysctl_kprobes_optimization,
1512 .maxlen = sizeof(int),
1513 .mode = 0644,
1514 .proc_handler = proc_kprobes_optimization_handler,
1515 .extra1 = &zero,
1516 .extra2 = &one,
1517 },
1518#endif
1519 { }
1520};
1521
1522static struct ctl_table dev_table[] = {
1523 { }
1524};
1525
1526static DEFINE_SPINLOCK(sysctl_lock);
1527
1528
1529static int use_table(struct ctl_table_header *p)
1530{
1531 if (unlikely(p->unregistering))
1532 return 0;
1533 p->used++;
1534 return 1;
1535}
1536
1537
1538static void unuse_table(struct ctl_table_header *p)
1539{
1540 if (!--p->used)
1541 if (unlikely(p->unregistering))
1542 complete(p->unregistering);
1543}
1544
1545
1546static void start_unregistering(struct ctl_table_header *p)
1547{
1548
1549
1550
1551
1552 if (unlikely(p->used)) {
1553 struct completion wait;
1554 init_completion(&wait);
1555 p->unregistering = &wait;
1556 spin_unlock(&sysctl_lock);
1557 wait_for_completion(&wait);
1558 spin_lock(&sysctl_lock);
1559 } else {
1560
1561 p->unregistering = ERR_PTR(-EINVAL);
1562 }
1563
1564
1565
1566
1567 list_del_init(&p->ctl_entry);
1568}
1569
1570void sysctl_head_get(struct ctl_table_header *head)
1571{
1572 spin_lock(&sysctl_lock);
1573 head->count++;
1574 spin_unlock(&sysctl_lock);
1575}
1576
1577void sysctl_head_put(struct ctl_table_header *head)
1578{
1579 spin_lock(&sysctl_lock);
1580 if (!--head->count)
1581 kfree(head);
1582 spin_unlock(&sysctl_lock);
1583}
1584
1585struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1586{
1587 if (!head)
1588 BUG();
1589 spin_lock(&sysctl_lock);
1590 if (!use_table(head))
1591 head = ERR_PTR(-ENOENT);
1592 spin_unlock(&sysctl_lock);
1593 return head;
1594}
1595
1596void sysctl_head_finish(struct ctl_table_header *head)
1597{
1598 if (!head)
1599 return;
1600 spin_lock(&sysctl_lock);
1601 unuse_table(head);
1602 spin_unlock(&sysctl_lock);
1603}
1604
1605static struct ctl_table_set *
1606lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1607{
1608 struct ctl_table_set *set = &root->default_set;
1609 if (root->lookup)
1610 set = root->lookup(root, namespaces);
1611 return set;
1612}
1613
1614static struct list_head *
1615lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1616{
1617 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1618 return &set->list;
1619}
1620
1621struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1622 struct ctl_table_header *prev)
1623{
1624 struct ctl_table_root *root;
1625 struct list_head *header_list;
1626 struct ctl_table_header *head;
1627 struct list_head *tmp;
1628
1629 spin_lock(&sysctl_lock);
1630 if (prev) {
1631 head = prev;
1632 tmp = &prev->ctl_entry;
1633 unuse_table(prev);
1634 goto next;
1635 }
1636 tmp = &root_table_header.ctl_entry;
1637 for (;;) {
1638 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1639
1640 if (!use_table(head))
1641 goto next;
1642 spin_unlock(&sysctl_lock);
1643 return head;
1644 next:
1645 root = head->root;
1646 tmp = tmp->next;
1647 header_list = lookup_header_list(root, namespaces);
1648 if (tmp != header_list)
1649 continue;
1650
1651 do {
1652 root = list_entry(root->root_list.next,
1653 struct ctl_table_root, root_list);
1654 if (root == &sysctl_table_root)
1655 goto out;
1656 header_list = lookup_header_list(root, namespaces);
1657 } while (list_empty(header_list));
1658 tmp = header_list->next;
1659 }
1660out:
1661 spin_unlock(&sysctl_lock);
1662 return NULL;
1663}
1664
1665struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1666{
1667 return __sysctl_head_next(current->nsproxy, prev);
1668}
1669
1670void register_sysctl_root(struct ctl_table_root *root)
1671{
1672 spin_lock(&sysctl_lock);
1673 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1674 spin_unlock(&sysctl_lock);
1675}
1676
1677
1678
1679
1680
1681
1682static int test_perm(int mode, int op)
1683{
1684 if (!current_euid())
1685 mode >>= 6;
1686 else if (in_egroup_p(0))
1687 mode >>= 3;
1688 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1689 return 0;
1690 return -EACCES;
1691}
1692
1693int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1694{
1695 int error;
1696 int mode;
1697
1698 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1699 if (error)
1700 return error;
1701
1702 if (root->permissions)
1703 mode = root->permissions(root, current->nsproxy, table);
1704 else
1705 mode = table->mode;
1706
1707 return test_perm(mode, op);
1708}
1709
1710static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1711{
1712 for (; table->procname; table++) {
1713 table->parent = parent;
1714 if (table->child)
1715 sysctl_set_parent(table, table->child);
1716 }
1717}
1718
1719static __init int sysctl_init(void)
1720{
1721 sysctl_set_parent(NULL, root_table);
1722#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1723 sysctl_check_table(current->nsproxy, root_table);
1724#endif
1725 return 0;
1726}
1727
1728core_initcall(sysctl_init);
1729
1730static struct ctl_table *is_branch_in(struct ctl_table *branch,
1731 struct ctl_table *table)
1732{
1733 struct ctl_table *p;
1734 const char *s = branch->procname;
1735
1736
1737 if (!s || !branch->child)
1738 return NULL;
1739
1740
1741 if (branch[1].procname)
1742 return NULL;
1743
1744
1745 for (p = table; p->procname; p++) {
1746 if (!p->child)
1747 continue;
1748 if (p->procname && strcmp(p->procname, s) == 0)
1749 return p;
1750 }
1751 return NULL;
1752}
1753
1754
1755static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1756{
1757 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1758 struct ctl_table *next;
1759 int is_better = 0;
1760 int not_in_parent = !p->attached_by;
1761
1762 while ((next = is_branch_in(by, to)) != NULL) {
1763 if (by == q->attached_by)
1764 is_better = 1;
1765 if (to == p->attached_by)
1766 not_in_parent = 1;
1767 by = by->child;
1768 to = next->child;
1769 }
1770
1771 if (is_better && not_in_parent) {
1772 q->attached_by = by;
1773 q->attached_to = to;
1774 q->parent = p;
1775 }
1776}
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831struct ctl_table_header *__register_sysctl_paths(
1832 struct ctl_table_root *root,
1833 struct nsproxy *namespaces,
1834 const struct ctl_path *path, struct ctl_table *table)
1835{
1836 struct ctl_table_header *header;
1837 struct ctl_table *new, **prevp;
1838 unsigned int n, npath;
1839 struct ctl_table_set *set;
1840
1841
1842 for (npath = 0; path[npath].procname; ++npath)
1843 ;
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853 header = kzalloc(sizeof(struct ctl_table_header) +
1854 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1855 if (!header)
1856 return NULL;
1857
1858 new = (struct ctl_table *) (header + 1);
1859
1860
1861 prevp = &header->ctl_table;
1862 for (n = 0; n < npath; ++n, ++path) {
1863
1864 new->procname = path->procname;
1865 new->mode = 0555;
1866
1867 *prevp = new;
1868 prevp = &new->child;
1869
1870 new += 2;
1871 }
1872 *prevp = table;
1873 header->ctl_table_arg = table;
1874
1875 INIT_LIST_HEAD(&header->ctl_entry);
1876 header->used = 0;
1877 header->unregistering = NULL;
1878 header->root = root;
1879 sysctl_set_parent(NULL, header->ctl_table);
1880 header->count = 1;
1881#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1882 if (sysctl_check_table(namespaces, header->ctl_table)) {
1883 kfree(header);
1884 return NULL;
1885 }
1886#endif
1887 spin_lock(&sysctl_lock);
1888 header->set = lookup_header_set(root, namespaces);
1889 header->attached_by = header->ctl_table;
1890 header->attached_to = root_table;
1891 header->parent = &root_table_header;
1892 for (set = header->set; set; set = set->parent) {
1893 struct ctl_table_header *p;
1894 list_for_each_entry(p, &set->list, ctl_entry) {
1895 if (p->unregistering)
1896 continue;
1897 try_attach(p, header);
1898 }
1899 }
1900 header->parent->count++;
1901 list_add_tail(&header->ctl_entry, &header->set->list);
1902 spin_unlock(&sysctl_lock);
1903
1904 return header;
1905}
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1918 struct ctl_table *table)
1919{
1920 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1921 path, table);
1922}
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1934{
1935 static const struct ctl_path null_path[] = { {} };
1936
1937 return register_sysctl_paths(null_path, table);
1938}
1939
1940
1941
1942
1943
1944
1945
1946
1947void unregister_sysctl_table(struct ctl_table_header * header)
1948{
1949 might_sleep();
1950
1951 if (header == NULL)
1952 return;
1953
1954 spin_lock(&sysctl_lock);
1955 start_unregistering(header);
1956 if (!--header->parent->count) {
1957 WARN_ON(1);
1958 kfree(header->parent);
1959 }
1960 if (!--header->count)
1961 kfree(header);
1962 spin_unlock(&sysctl_lock);
1963}
1964
1965int sysctl_is_seen(struct ctl_table_header *p)
1966{
1967 struct ctl_table_set *set = p->set;
1968 int res;
1969 spin_lock(&sysctl_lock);
1970 if (p->unregistering)
1971 res = 0;
1972 else if (!set->is_seen)
1973 res = 1;
1974 else
1975 res = set->is_seen(set);
1976 spin_unlock(&sysctl_lock);
1977 return res;
1978}
1979
1980void setup_sysctl_set(struct ctl_table_set *p,
1981 struct ctl_table_set *parent,
1982 int (*is_seen)(struct ctl_table_set *))
1983{
1984 INIT_LIST_HEAD(&p->list);
1985 p->parent = parent ? parent : &sysctl_table_root.default_set;
1986 p->is_seen = is_seen;
1987}
1988
1989#else
1990struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1991{
1992 return NULL;
1993}
1994
1995struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1996 struct ctl_table *table)
1997{
1998 return NULL;
1999}
2000
2001void unregister_sysctl_table(struct ctl_table_header * table)
2002{
2003}
2004
2005void setup_sysctl_set(struct ctl_table_set *p,
2006 struct ctl_table_set *parent,
2007 int (*is_seen)(struct ctl_table_set *))
2008{
2009}
2010
2011void sysctl_head_put(struct ctl_table_header *head)
2012{
2013}
2014
2015#endif
2016
2017
2018
2019
2020
2021#ifdef CONFIG_PROC_SYSCTL
2022
2023static int _proc_do_string(void* data, int maxlen, int write,
2024 void __user *buffer,
2025 size_t *lenp, loff_t *ppos)
2026{
2027 size_t len;
2028 char __user *p;
2029 char c;
2030
2031 if (!data || !maxlen || !*lenp) {
2032 *lenp = 0;
2033 return 0;
2034 }
2035
2036 if (write) {
2037 len = 0;
2038 p = buffer;
2039 while (len < *lenp) {
2040 if (get_user(c, p++))
2041 return -EFAULT;
2042 if (c == 0 || c == '\n')
2043 break;
2044 len++;
2045 }
2046 if (len >= maxlen)
2047 len = maxlen-1;
2048 if(copy_from_user(data, buffer, len))
2049 return -EFAULT;
2050 ((char *) data)[len] = 0;
2051 *ppos += *lenp;
2052 } else {
2053 len = strlen(data);
2054 if (len > maxlen)
2055 len = maxlen;
2056
2057 if (*ppos > len) {
2058 *lenp = 0;
2059 return 0;
2060 }
2061
2062 data += *ppos;
2063 len -= *ppos;
2064
2065 if (len > *lenp)
2066 len = *lenp;
2067 if (len)
2068 if(copy_to_user(buffer, data, len))
2069 return -EFAULT;
2070 if (len < *lenp) {
2071 if(put_user('\n', ((char __user *) buffer) + len))
2072 return -EFAULT;
2073 len++;
2074 }
2075 *lenp = len;
2076 *ppos += len;
2077 }
2078 return 0;
2079}
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098int proc_dostring(struct ctl_table *table, int write,
2099 void __user *buffer, size_t *lenp, loff_t *ppos)
2100{
2101 return _proc_do_string(table->data, table->maxlen, write,
2102 buffer, lenp, ppos);
2103}
2104
2105static size_t proc_skip_spaces(char **buf)
2106{
2107 size_t ret;
2108 char *tmp = skip_spaces(*buf);
2109 ret = tmp - *buf;
2110 *buf = tmp;
2111 return ret;
2112}
2113
2114static void proc_skip_char(char **buf, size_t *size, const char v)
2115{
2116 while (*size) {
2117 if (**buf != v)
2118 break;
2119 (*size)--;
2120 (*buf)++;
2121 }
2122}
2123
2124#define TMPBUFLEN 22
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141static int proc_get_long(char **buf, size_t *size,
2142 unsigned long *val, bool *neg,
2143 const char *perm_tr, unsigned perm_tr_len, char *tr)
2144{
2145 int len;
2146 char *p, tmp[TMPBUFLEN];
2147
2148 if (!*size)
2149 return -EINVAL;
2150
2151 len = *size;
2152 if (len > TMPBUFLEN - 1)
2153 len = TMPBUFLEN - 1;
2154
2155 memcpy(tmp, *buf, len);
2156
2157 tmp[len] = 0;
2158 p = tmp;
2159 if (*p == '-' && *size > 1) {
2160 *neg = true;
2161 p++;
2162 } else
2163 *neg = false;
2164 if (!isdigit(*p))
2165 return -EINVAL;
2166
2167 *val = simple_strtoul(p, &p, 0);
2168
2169 len = p - tmp;
2170
2171
2172
2173
2174 if (len == TMPBUFLEN - 1)
2175 return -EINVAL;
2176
2177 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2178 return -EINVAL;
2179
2180 if (tr && (len < *size))
2181 *tr = *p;
2182
2183 *buf += len;
2184 *size -= len;
2185
2186 return 0;
2187}
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2201 bool neg)
2202{
2203 int len;
2204 char tmp[TMPBUFLEN], *p = tmp;
2205
2206 sprintf(p, "%s%lu", neg ? "-" : "", val);
2207 len = strlen(tmp);
2208 if (len > *size)
2209 len = *size;
2210 if (copy_to_user(*buf, tmp, len))
2211 return -EFAULT;
2212 *size -= len;
2213 *buf += len;
2214 return 0;
2215}
2216#undef TMPBUFLEN
2217
2218static int proc_put_char(void __user **buf, size_t *size, char c)
2219{
2220 if (*size) {
2221 char __user **buffer = (char __user **)buf;
2222 if (put_user(c, *buffer))
2223 return -EFAULT;
2224 (*size)--, (*buffer)++;
2225 *buf = *buffer;
2226 }
2227 return 0;
2228}
2229
2230static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2231 int *valp,
2232 int write, void *data)
2233{
2234 if (write) {
2235 *valp = *negp ? -*lvalp : *lvalp;
2236 } else {
2237 int val = *valp;
2238 if (val < 0) {
2239 *negp = true;
2240 *lvalp = (unsigned long)-val;
2241 } else {
2242 *negp = false;
2243 *lvalp = (unsigned long)val;
2244 }
2245 }
2246 return 0;
2247}
2248
2249static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2250
2251static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2252 int write, void __user *buffer,
2253 size_t *lenp, loff_t *ppos,
2254 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2255 int write, void *data),
2256 void *data)
2257{
2258 int *i, vleft, first = 1, err = 0;
2259 unsigned long page = 0;
2260 size_t left;
2261 char *kbuf;
2262
2263 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2264 *lenp = 0;
2265 return 0;
2266 }
2267
2268 i = (int *) tbl_data;
2269 vleft = table->maxlen / sizeof(*i);
2270 left = *lenp;
2271
2272 if (!conv)
2273 conv = do_proc_dointvec_conv;
2274
2275 if (write) {
2276 if (left > PAGE_SIZE - 1)
2277 left = PAGE_SIZE - 1;
2278 page = __get_free_page(GFP_TEMPORARY);
2279 kbuf = (char *) page;
2280 if (!kbuf)
2281 return -ENOMEM;
2282 if (copy_from_user(kbuf, buffer, left)) {
2283 err = -EFAULT;
2284 goto free;
2285 }
2286 kbuf[left] = 0;
2287 }
2288
2289 for (; left && vleft--; i++, first=0) {
2290 unsigned long lval;
2291 bool neg;
2292
2293 if (write) {
2294 left -= proc_skip_spaces(&kbuf);
2295
2296 if (!left)
2297 break;
2298 err = proc_get_long(&kbuf, &left, &lval, &neg,
2299 proc_wspace_sep,
2300 sizeof(proc_wspace_sep), NULL);
2301 if (err)
2302 break;
2303 if (conv(&neg, &lval, i, 1, data)) {
2304 err = -EINVAL;
2305 break;
2306 }
2307 } else {
2308 if (conv(&neg, &lval, i, 0, data)) {
2309 err = -EINVAL;
2310 break;
2311 }
2312 if (!first)
2313 err = proc_put_char(&buffer, &left, '\t');
2314 if (err)
2315 break;
2316 err = proc_put_long(&buffer, &left, lval, neg);
2317 if (err)
2318 break;
2319 }
2320 }
2321
2322 if (!write && !first && left && !err)
2323 err = proc_put_char(&buffer, &left, '\n');
2324 if (write && !err && left)
2325 left -= proc_skip_spaces(&kbuf);
2326free:
2327 if (write) {
2328 free_page(page);
2329 if (first)
2330 return err ? : -EINVAL;
2331 }
2332 *lenp -= left;
2333 *ppos += *lenp;
2334 return err;
2335}
2336
2337static int do_proc_dointvec(struct ctl_table *table, int write,
2338 void __user *buffer, size_t *lenp, loff_t *ppos,
2339 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2340 int write, void *data),
2341 void *data)
2342{
2343 return __do_proc_dointvec(table->data, table, write,
2344 buffer, lenp, ppos, conv, data);
2345}
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360int proc_dointvec(struct ctl_table *table, int write,
2361 void __user *buffer, size_t *lenp, loff_t *ppos)
2362{
2363 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2364 NULL,NULL);
2365}
2366
2367
2368
2369
2370
2371static int proc_taint(struct ctl_table *table, int write,
2372 void __user *buffer, size_t *lenp, loff_t *ppos)
2373{
2374 struct ctl_table t;
2375 unsigned long tmptaint = get_taint();
2376 int err;
2377
2378 if (write && !capable(CAP_SYS_ADMIN))
2379 return -EPERM;
2380
2381 t = *table;
2382 t.data = &tmptaint;
2383 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2384 if (err < 0)
2385 return err;
2386
2387 if (write) {
2388
2389
2390
2391
2392 int i;
2393 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2394 if ((tmptaint >> i) & 1)
2395 add_taint(i);
2396 }
2397 }
2398
2399 return err;
2400}
2401
2402struct do_proc_dointvec_minmax_conv_param {
2403 int *min;
2404 int *max;
2405};
2406
2407static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2408 int *valp,
2409 int write, void *data)
2410{
2411 struct do_proc_dointvec_minmax_conv_param *param = data;
2412 if (write) {
2413 int val = *negp ? -*lvalp : *lvalp;
2414 if ((param->min && *param->min > val) ||
2415 (param->max && *param->max < val))
2416 return -EINVAL;
2417 *valp = val;
2418 } else {
2419 int val = *valp;
2420 if (val < 0) {
2421 *negp = true;
2422 *lvalp = (unsigned long)-val;
2423 } else {
2424 *negp = false;
2425 *lvalp = (unsigned long)val;
2426 }
2427 }
2428 return 0;
2429}
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447int proc_dointvec_minmax(struct ctl_table *table, int write,
2448 void __user *buffer, size_t *lenp, loff_t *ppos)
2449{
2450 struct do_proc_dointvec_minmax_conv_param param = {
2451 .min = (int *) table->extra1,
2452 .max = (int *) table->extra2,
2453 };
2454 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2455 do_proc_dointvec_minmax_conv, ¶m);
2456}
2457
2458static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2459 void __user *buffer,
2460 size_t *lenp, loff_t *ppos,
2461 unsigned long convmul,
2462 unsigned long convdiv)
2463{
2464 unsigned long *i, *min, *max;
2465 int vleft, first = 1, err = 0;
2466 unsigned long page = 0;
2467 size_t left;
2468 char *kbuf;
2469
2470 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2471 *lenp = 0;
2472 return 0;
2473 }
2474
2475 i = (unsigned long *) data;
2476 min = (unsigned long *) table->extra1;
2477 max = (unsigned long *) table->extra2;
2478 vleft = table->maxlen / sizeof(unsigned long);
2479 left = *lenp;
2480
2481 if (write) {
2482 if (left > PAGE_SIZE - 1)
2483 left = PAGE_SIZE - 1;
2484 page = __get_free_page(GFP_TEMPORARY);
2485 kbuf = (char *) page;
2486 if (!kbuf)
2487 return -ENOMEM;
2488 if (copy_from_user(kbuf, buffer, left)) {
2489 err = -EFAULT;
2490 goto free;
2491 }
2492 kbuf[left] = 0;
2493 }
2494
2495 for (; left && vleft--; i++, first = 0) {
2496 unsigned long val;
2497
2498 if (write) {
2499 bool neg;
2500
2501 left -= proc_skip_spaces(&kbuf);
2502
2503 err = proc_get_long(&kbuf, &left, &val, &neg,
2504 proc_wspace_sep,
2505 sizeof(proc_wspace_sep), NULL);
2506 if (err)
2507 break;
2508 if (neg)
2509 continue;
2510 if ((min && val < *min) || (max && val > *max))
2511 continue;
2512 *i = val;
2513 } else {
2514 val = convdiv * (*i) / convmul;
2515 if (!first)
2516 err = proc_put_char(&buffer, &left, '\t');
2517 err = proc_put_long(&buffer, &left, val, false);
2518 if (err)
2519 break;
2520 }
2521 }
2522
2523 if (!write && !first && left && !err)
2524 err = proc_put_char(&buffer, &left, '\n');
2525 if (write && !err)
2526 left -= proc_skip_spaces(&kbuf);
2527free:
2528 if (write) {
2529 free_page(page);
2530 if (first)
2531 return err ? : -EINVAL;
2532 }
2533 *lenp -= left;
2534 *ppos += *lenp;
2535 return err;
2536}
2537
2538static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2539 void __user *buffer,
2540 size_t *lenp, loff_t *ppos,
2541 unsigned long convmul,
2542 unsigned long convdiv)
2543{
2544 return __do_proc_doulongvec_minmax(table->data, table, write,
2545 buffer, lenp, ppos, convmul, convdiv);
2546}
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564int proc_doulongvec_minmax(struct ctl_table *table, int write,
2565 void __user *buffer, size_t *lenp, loff_t *ppos)
2566{
2567 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2568}
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2588 void __user *buffer,
2589 size_t *lenp, loff_t *ppos)
2590{
2591 return do_proc_doulongvec_minmax(table, write, buffer,
2592 lenp, ppos, HZ, 1000l);
2593}
2594
2595
2596static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2597 int *valp,
2598 int write, void *data)
2599{
2600 if (write) {
2601 if (*lvalp > LONG_MAX / HZ)
2602 return 1;
2603 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2604 } else {
2605 int val = *valp;
2606 unsigned long lval;
2607 if (val < 0) {
2608 *negp = true;
2609 lval = (unsigned long)-val;
2610 } else {
2611 *negp = false;
2612 lval = (unsigned long)val;
2613 }
2614 *lvalp = lval / HZ;
2615 }
2616 return 0;
2617}
2618
2619static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2620 int *valp,
2621 int write, void *data)
2622{
2623 if (write) {
2624 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2625 return 1;
2626 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2627 } else {
2628 int val = *valp;
2629 unsigned long lval;
2630 if (val < 0) {
2631 *negp = true;
2632 lval = (unsigned long)-val;
2633 } else {
2634 *negp = false;
2635 lval = (unsigned long)val;
2636 }
2637 *lvalp = jiffies_to_clock_t(lval);
2638 }
2639 return 0;
2640}
2641
2642static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2643 int *valp,
2644 int write, void *data)
2645{
2646 if (write) {
2647 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2648 } else {
2649 int val = *valp;
2650 unsigned long lval;
2651 if (val < 0) {
2652 *negp = true;
2653 lval = (unsigned long)-val;
2654 } else {
2655 *negp = false;
2656 lval = (unsigned long)val;
2657 }
2658 *lvalp = jiffies_to_msecs(lval);
2659 }
2660 return 0;
2661}
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678int proc_dointvec_jiffies(struct ctl_table *table, int write,
2679 void __user *buffer, size_t *lenp, loff_t *ppos)
2680{
2681 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2682 do_proc_dointvec_jiffies_conv,NULL);
2683}
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2701 void __user *buffer, size_t *lenp, loff_t *ppos)
2702{
2703 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2704 do_proc_dointvec_userhz_jiffies_conv,NULL);
2705}
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2724 void __user *buffer, size_t *lenp, loff_t *ppos)
2725{
2726 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2727 do_proc_dointvec_ms_jiffies_conv, NULL);
2728}
2729
2730static int proc_do_cad_pid(struct ctl_table *table, int write,
2731 void __user *buffer, size_t *lenp, loff_t *ppos)
2732{
2733 struct pid *new_pid;
2734 pid_t tmp;
2735 int r;
2736
2737 tmp = pid_vnr(cad_pid);
2738
2739 r = __do_proc_dointvec(&tmp, table, write, buffer,
2740 lenp, ppos, NULL, NULL);
2741 if (r || !write)
2742 return r;
2743
2744 new_pid = find_get_pid(tmp);
2745 if (!new_pid)
2746 return -ESRCH;
2747
2748 put_pid(xchg(&cad_pid, new_pid));
2749 return 0;
2750}
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769int proc_do_large_bitmap(struct ctl_table *table, int write,
2770 void __user *buffer, size_t *lenp, loff_t *ppos)
2771{
2772 int err = 0;
2773 bool first = 1;
2774 size_t left = *lenp;
2775 unsigned long bitmap_len = table->maxlen;
2776 unsigned long *bitmap = (unsigned long *) table->data;
2777 unsigned long *tmp_bitmap = NULL;
2778 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2779
2780 if (!bitmap_len || !left || (*ppos && !write)) {
2781 *lenp = 0;
2782 return 0;
2783 }
2784
2785 if (write) {
2786 unsigned long page = 0;
2787 char *kbuf;
2788
2789 if (left > PAGE_SIZE - 1)
2790 left = PAGE_SIZE - 1;
2791
2792 page = __get_free_page(GFP_TEMPORARY);
2793 kbuf = (char *) page;
2794 if (!kbuf)
2795 return -ENOMEM;
2796 if (copy_from_user(kbuf, buffer, left)) {
2797 free_page(page);
2798 return -EFAULT;
2799 }
2800 kbuf[left] = 0;
2801
2802 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2803 GFP_KERNEL);
2804 if (!tmp_bitmap) {
2805 free_page(page);
2806 return -ENOMEM;
2807 }
2808 proc_skip_char(&kbuf, &left, '\n');
2809 while (!err && left) {
2810 unsigned long val_a, val_b;
2811 bool neg;
2812
2813 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2814 sizeof(tr_a), &c);
2815 if (err)
2816 break;
2817 if (val_a >= bitmap_len || neg) {
2818 err = -EINVAL;
2819 break;
2820 }
2821
2822 val_b = val_a;
2823 if (left) {
2824 kbuf++;
2825 left--;
2826 }
2827
2828 if (c == '-') {
2829 err = proc_get_long(&kbuf, &left, &val_b,
2830 &neg, tr_b, sizeof(tr_b),
2831 &c);
2832 if (err)
2833 break;
2834 if (val_b >= bitmap_len || neg ||
2835 val_a > val_b) {
2836 err = -EINVAL;
2837 break;
2838 }
2839 if (left) {
2840 kbuf++;
2841 left--;
2842 }
2843 }
2844
2845 while (val_a <= val_b)
2846 set_bit(val_a++, tmp_bitmap);
2847
2848 first = 0;
2849 proc_skip_char(&kbuf, &left, '\n');
2850 }
2851 free_page(page);
2852 } else {
2853 unsigned long bit_a, bit_b = 0;
2854
2855 while (left) {
2856 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2857 if (bit_a >= bitmap_len)
2858 break;
2859 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2860 bit_a + 1) - 1;
2861
2862 if (!first) {
2863 err = proc_put_char(&buffer, &left, ',');
2864 if (err)
2865 break;
2866 }
2867 err = proc_put_long(&buffer, &left, bit_a, false);
2868 if (err)
2869 break;
2870 if (bit_a != bit_b) {
2871 err = proc_put_char(&buffer, &left, '-');
2872 if (err)
2873 break;
2874 err = proc_put_long(&buffer, &left, bit_b, false);
2875 if (err)
2876 break;
2877 }
2878
2879 first = 0; bit_b++;
2880 }
2881 if (!err)
2882 err = proc_put_char(&buffer, &left, '\n');
2883 }
2884
2885 if (!err) {
2886 if (write) {
2887 if (*ppos)
2888 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2889 else
2890 memcpy(bitmap, tmp_bitmap,
2891 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2892 }
2893 kfree(tmp_bitmap);
2894 *lenp -= left;
2895 *ppos += *lenp;
2896 return 0;
2897 } else {
2898 kfree(tmp_bitmap);
2899 return err;
2900 }
2901}
2902
2903#else
2904
2905int proc_dostring(struct ctl_table *table, int write,
2906 void __user *buffer, size_t *lenp, loff_t *ppos)
2907{
2908 return -ENOSYS;
2909}
2910
2911int proc_dointvec(struct ctl_table *table, int write,
2912 void __user *buffer, size_t *lenp, loff_t *ppos)
2913{
2914 return -ENOSYS;
2915}
2916
2917int proc_dointvec_minmax(struct ctl_table *table, int write,
2918 void __user *buffer, size_t *lenp, loff_t *ppos)
2919{
2920 return -ENOSYS;
2921}
2922
2923int proc_dointvec_jiffies(struct ctl_table *table, int write,
2924 void __user *buffer, size_t *lenp, loff_t *ppos)
2925{
2926 return -ENOSYS;
2927}
2928
2929int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2930 void __user *buffer, size_t *lenp, loff_t *ppos)
2931{
2932 return -ENOSYS;
2933}
2934
2935int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2936 void __user *buffer, size_t *lenp, loff_t *ppos)
2937{
2938 return -ENOSYS;
2939}
2940
2941int proc_doulongvec_minmax(struct ctl_table *table, int write,
2942 void __user *buffer, size_t *lenp, loff_t *ppos)
2943{
2944 return -ENOSYS;
2945}
2946
2947int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2948 void __user *buffer,
2949 size_t *lenp, loff_t *ppos)
2950{
2951 return -ENOSYS;
2952}
2953
2954
2955#endif
2956
2957
2958
2959
2960
2961EXPORT_SYMBOL(proc_dointvec);
2962EXPORT_SYMBOL(proc_dointvec_jiffies);
2963EXPORT_SYMBOL(proc_dointvec_minmax);
2964EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2965EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2966EXPORT_SYMBOL(proc_dostring);
2967EXPORT_SYMBOL(proc_doulongvec_minmax);
2968EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2969EXPORT_SYMBOL(register_sysctl_table);
2970EXPORT_SYMBOL(register_sysctl_paths);
2971EXPORT_SYMBOL(unregister_sysctl_table);
2972
