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