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Merge tag 'fixes-nc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[mirror_ubuntu-bionic-kernel.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
68
69 #ifdef CONFIG_X86
70 #include <asm/nmi.h>
71 #include <asm/stacktrace.h>
72 #include <asm/io.h>
73 #endif
74 #ifdef CONFIG_SPARC
75 #include <asm/setup.h>
76 #endif
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
79 #endif
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
82 #endif
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
85 #endif
86 #ifdef CONFIG_CHR_DEV_SG
87 #include <scsi/sg.h>
88 #endif
89
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
92 #endif
93
94
95 #if defined(CONFIG_SYSCTL)
96
97 /* External variables not in a header file. */
98 extern int max_threads;
99 extern int suid_dumpable;
100 #ifdef CONFIG_COREDUMP
101 extern int core_uses_pid;
102 extern char core_pattern[];
103 extern unsigned int core_pipe_limit;
104 #endif
105 extern int pid_max;
106 extern int pid_max_min, pid_max_max;
107 extern int percpu_pagelist_fraction;
108 extern int compat_log;
109 extern int latencytop_enabled;
110 extern int sysctl_nr_open_min, sysctl_nr_open_max;
111 #ifndef CONFIG_MMU
112 extern int sysctl_nr_trim_pages;
113 #endif
114 #ifdef CONFIG_BLOCK
115 extern int blk_iopoll_enabled;
116 #endif
117
118 /* Constants used for minimum and maximum */
119 #ifdef CONFIG_LOCKUP_DETECTOR
120 static int sixty = 60;
121 #endif
122
123 static int zero;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused three = 3;
127 static unsigned long one_ul = 1;
128 static int one_hundred = 100;
129 #ifdef CONFIG_PRINTK
130 static int ten_thousand = 10000;
131 #endif
132
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid = 65535;
138 static int minolduid;
139 static int min_percpu_pagelist_fract = 8;
140
141 static int ngroups_max = NGROUPS_MAX;
142 static const int cap_last_cap = CAP_LAST_CAP;
143
144 #ifdef CONFIG_INOTIFY_USER
145 #include <linux/inotify.h>
146 #endif
147 #ifdef CONFIG_SPARC
148 #endif
149
150 #ifdef CONFIG_SPARC64
151 extern int sysctl_tsb_ratio;
152 #endif
153
154 #ifdef __hppa__
155 extern int pwrsw_enabled;
156 #endif
157
158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
159 extern int unaligned_enabled;
160 #endif
161
162 #ifdef CONFIG_IA64
163 extern int unaligned_dump_stack;
164 #endif
165
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167 extern int no_unaligned_warning;
168 #endif
169
170 #ifdef CONFIG_PROC_SYSCTL
171 static int proc_do_cad_pid(struct ctl_table *table, int write,
172 void __user *buffer, size_t *lenp, loff_t *ppos);
173 static int proc_taint(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175 #endif
176
177 #ifdef CONFIG_PRINTK
178 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
179 void __user *buffer, size_t *lenp, loff_t *ppos);
180 #endif
181
182 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
183 void __user *buffer, size_t *lenp, loff_t *ppos);
184 #ifdef CONFIG_COREDUMP
185 static int proc_dostring_coredump(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
187 #endif
188
189 #ifdef CONFIG_MAGIC_SYSRQ
190 /* Note: sysrq code uses it's own private copy */
191 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
192
193 static int sysrq_sysctl_handler(ctl_table *table, int write,
194 void __user *buffer, size_t *lenp,
195 loff_t *ppos)
196 {
197 int error;
198
199 error = proc_dointvec(table, write, buffer, lenp, ppos);
200 if (error)
201 return error;
202
203 if (write)
204 sysrq_toggle_support(__sysrq_enabled);
205
206 return 0;
207 }
208
209 #endif
210
211 static struct ctl_table kern_table[];
212 static struct ctl_table vm_table[];
213 static struct ctl_table fs_table[];
214 static struct ctl_table debug_table[];
215 static struct ctl_table dev_table[];
216 extern struct ctl_table random_table[];
217 #ifdef CONFIG_EPOLL
218 extern struct ctl_table epoll_table[];
219 #endif
220
221 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
222 int sysctl_legacy_va_layout;
223 #endif
224
225 /* The default sysctl tables: */
226
227 static struct ctl_table sysctl_base_table[] = {
228 {
229 .procname = "kernel",
230 .mode = 0555,
231 .child = kern_table,
232 },
233 {
234 .procname = "vm",
235 .mode = 0555,
236 .child = vm_table,
237 },
238 {
239 .procname = "fs",
240 .mode = 0555,
241 .child = fs_table,
242 },
243 {
244 .procname = "debug",
245 .mode = 0555,
246 .child = debug_table,
247 },
248 {
249 .procname = "dev",
250 .mode = 0555,
251 .child = dev_table,
252 },
253 { }
254 };
255
256 #ifdef CONFIG_SCHED_DEBUG
257 static int min_sched_granularity_ns = 100000; /* 100 usecs */
258 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
259 static int min_wakeup_granularity_ns; /* 0 usecs */
260 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
261 #ifdef CONFIG_SMP
262 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
263 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
264 #endif /* CONFIG_SMP */
265 #endif /* CONFIG_SCHED_DEBUG */
266
267 #ifdef CONFIG_COMPACTION
268 static int min_extfrag_threshold;
269 static int max_extfrag_threshold = 1000;
270 #endif
271
272 static struct ctl_table kern_table[] = {
273 {
274 .procname = "sched_child_runs_first",
275 .data = &sysctl_sched_child_runs_first,
276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
278 .proc_handler = proc_dointvec,
279 },
280 #ifdef CONFIG_SCHED_DEBUG
281 {
282 .procname = "sched_min_granularity_ns",
283 .data = &sysctl_sched_min_granularity,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = sched_proc_update_handler,
287 .extra1 = &min_sched_granularity_ns,
288 .extra2 = &max_sched_granularity_ns,
289 },
290 {
291 .procname = "sched_latency_ns",
292 .data = &sysctl_sched_latency,
293 .maxlen = sizeof(unsigned int),
294 .mode = 0644,
295 .proc_handler = sched_proc_update_handler,
296 .extra1 = &min_sched_granularity_ns,
297 .extra2 = &max_sched_granularity_ns,
298 },
299 {
300 .procname = "sched_wakeup_granularity_ns",
301 .data = &sysctl_sched_wakeup_granularity,
302 .maxlen = sizeof(unsigned int),
303 .mode = 0644,
304 .proc_handler = sched_proc_update_handler,
305 .extra1 = &min_wakeup_granularity_ns,
306 .extra2 = &max_wakeup_granularity_ns,
307 },
308 #ifdef CONFIG_SMP
309 {
310 .procname = "sched_tunable_scaling",
311 .data = &sysctl_sched_tunable_scaling,
312 .maxlen = sizeof(enum sched_tunable_scaling),
313 .mode = 0644,
314 .proc_handler = sched_proc_update_handler,
315 .extra1 = &min_sched_tunable_scaling,
316 .extra2 = &max_sched_tunable_scaling,
317 },
318 {
319 .procname = "sched_migration_cost_ns",
320 .data = &sysctl_sched_migration_cost,
321 .maxlen = sizeof(unsigned int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec,
324 },
325 {
326 .procname = "sched_nr_migrate",
327 .data = &sysctl_sched_nr_migrate,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec,
331 },
332 {
333 .procname = "sched_time_avg_ms",
334 .data = &sysctl_sched_time_avg,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
337 .proc_handler = proc_dointvec,
338 },
339 {
340 .procname = "sched_shares_window_ns",
341 .data = &sysctl_sched_shares_window,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
344 .proc_handler = proc_dointvec,
345 },
346 {
347 .procname = "timer_migration",
348 .data = &sysctl_timer_migration,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec_minmax,
352 .extra1 = &zero,
353 .extra2 = &one,
354 },
355 #endif /* CONFIG_SMP */
356 #ifdef CONFIG_NUMA_BALANCING
357 {
358 .procname = "numa_balancing_scan_delay_ms",
359 .data = &sysctl_numa_balancing_scan_delay,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
362 .proc_handler = proc_dointvec,
363 },
364 {
365 .procname = "numa_balancing_scan_period_min_ms",
366 .data = &sysctl_numa_balancing_scan_period_min,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec,
370 },
371 {
372 .procname = "numa_balancing_scan_period_max_ms",
373 .data = &sysctl_numa_balancing_scan_period_max,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
378 {
379 .procname = "numa_balancing_scan_size_mb",
380 .data = &sysctl_numa_balancing_scan_size,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec,
384 },
385 {
386 .procname = "numa_balancing_migrate_deferred",
387 .data = &sysctl_numa_balancing_migrate_deferred,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec,
391 },
392 #endif /* CONFIG_NUMA_BALANCING */
393 #endif /* CONFIG_SCHED_DEBUG */
394 {
395 .procname = "sched_rt_period_us",
396 .data = &sysctl_sched_rt_period,
397 .maxlen = sizeof(unsigned int),
398 .mode = 0644,
399 .proc_handler = sched_rt_handler,
400 },
401 {
402 .procname = "sched_rt_runtime_us",
403 .data = &sysctl_sched_rt_runtime,
404 .maxlen = sizeof(int),
405 .mode = 0644,
406 .proc_handler = sched_rt_handler,
407 },
408 {
409 .procname = "sched_rr_timeslice_ms",
410 .data = &sched_rr_timeslice,
411 .maxlen = sizeof(int),
412 .mode = 0644,
413 .proc_handler = sched_rr_handler,
414 },
415 #ifdef CONFIG_SCHED_AUTOGROUP
416 {
417 .procname = "sched_autogroup_enabled",
418 .data = &sysctl_sched_autogroup_enabled,
419 .maxlen = sizeof(unsigned int),
420 .mode = 0644,
421 .proc_handler = proc_dointvec_minmax,
422 .extra1 = &zero,
423 .extra2 = &one,
424 },
425 #endif
426 #ifdef CONFIG_CFS_BANDWIDTH
427 {
428 .procname = "sched_cfs_bandwidth_slice_us",
429 .data = &sysctl_sched_cfs_bandwidth_slice,
430 .maxlen = sizeof(unsigned int),
431 .mode = 0644,
432 .proc_handler = proc_dointvec_minmax,
433 .extra1 = &one,
434 },
435 #endif
436 #ifdef CONFIG_PROVE_LOCKING
437 {
438 .procname = "prove_locking",
439 .data = &prove_locking,
440 .maxlen = sizeof(int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec,
443 },
444 #endif
445 #ifdef CONFIG_LOCK_STAT
446 {
447 .procname = "lock_stat",
448 .data = &lock_stat,
449 .maxlen = sizeof(int),
450 .mode = 0644,
451 .proc_handler = proc_dointvec,
452 },
453 #endif
454 {
455 .procname = "panic",
456 .data = &panic_timeout,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 #ifdef CONFIG_COREDUMP
462 {
463 .procname = "core_uses_pid",
464 .data = &core_uses_pid,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec,
468 },
469 {
470 .procname = "core_pattern",
471 .data = core_pattern,
472 .maxlen = CORENAME_MAX_SIZE,
473 .mode = 0644,
474 .proc_handler = proc_dostring_coredump,
475 },
476 {
477 .procname = "core_pipe_limit",
478 .data = &core_pipe_limit,
479 .maxlen = sizeof(unsigned int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 #endif
484 #ifdef CONFIG_PROC_SYSCTL
485 {
486 .procname = "tainted",
487 .maxlen = sizeof(long),
488 .mode = 0644,
489 .proc_handler = proc_taint,
490 },
491 #endif
492 #ifdef CONFIG_LATENCYTOP
493 {
494 .procname = "latencytop",
495 .data = &latencytop_enabled,
496 .maxlen = sizeof(int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 #endif
501 #ifdef CONFIG_BLK_DEV_INITRD
502 {
503 .procname = "real-root-dev",
504 .data = &real_root_dev,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = proc_dointvec,
508 },
509 #endif
510 {
511 .procname = "print-fatal-signals",
512 .data = &print_fatal_signals,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec,
516 },
517 #ifdef CONFIG_SPARC
518 {
519 .procname = "reboot-cmd",
520 .data = reboot_command,
521 .maxlen = 256,
522 .mode = 0644,
523 .proc_handler = proc_dostring,
524 },
525 {
526 .procname = "stop-a",
527 .data = &stop_a_enabled,
528 .maxlen = sizeof (int),
529 .mode = 0644,
530 .proc_handler = proc_dointvec,
531 },
532 {
533 .procname = "scons-poweroff",
534 .data = &scons_pwroff,
535 .maxlen = sizeof (int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec,
538 },
539 #endif
540 #ifdef CONFIG_SPARC64
541 {
542 .procname = "tsb-ratio",
543 .data = &sysctl_tsb_ratio,
544 .maxlen = sizeof (int),
545 .mode = 0644,
546 .proc_handler = proc_dointvec,
547 },
548 #endif
549 #ifdef __hppa__
550 {
551 .procname = "soft-power",
552 .data = &pwrsw_enabled,
553 .maxlen = sizeof (int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec,
556 },
557 #endif
558 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
559 {
560 .procname = "unaligned-trap",
561 .data = &unaligned_enabled,
562 .maxlen = sizeof (int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566 #endif
567 {
568 .procname = "ctrl-alt-del",
569 .data = &C_A_D,
570 .maxlen = sizeof(int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec,
573 },
574 #ifdef CONFIG_FUNCTION_TRACER
575 {
576 .procname = "ftrace_enabled",
577 .data = &ftrace_enabled,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = ftrace_enable_sysctl,
581 },
582 #endif
583 #ifdef CONFIG_STACK_TRACER
584 {
585 .procname = "stack_tracer_enabled",
586 .data = &stack_tracer_enabled,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .proc_handler = stack_trace_sysctl,
590 },
591 #endif
592 #ifdef CONFIG_TRACING
593 {
594 .procname = "ftrace_dump_on_oops",
595 .data = &ftrace_dump_on_oops,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec,
599 },
600 {
601 .procname = "traceoff_on_warning",
602 .data = &__disable_trace_on_warning,
603 .maxlen = sizeof(__disable_trace_on_warning),
604 .mode = 0644,
605 .proc_handler = proc_dointvec,
606 },
607 #endif
608 #ifdef CONFIG_MODULES
609 {
610 .procname = "modprobe",
611 .data = &modprobe_path,
612 .maxlen = KMOD_PATH_LEN,
613 .mode = 0644,
614 .proc_handler = proc_dostring,
615 },
616 {
617 .procname = "modules_disabled",
618 .data = &modules_disabled,
619 .maxlen = sizeof(int),
620 .mode = 0644,
621 /* only handle a transition from default "0" to "1" */
622 .proc_handler = proc_dointvec_minmax,
623 .extra1 = &one,
624 .extra2 = &one,
625 },
626 #endif
627
628 {
629 .procname = "hotplug",
630 .data = &uevent_helper,
631 .maxlen = UEVENT_HELPER_PATH_LEN,
632 .mode = 0644,
633 .proc_handler = proc_dostring,
634 },
635
636 #ifdef CONFIG_CHR_DEV_SG
637 {
638 .procname = "sg-big-buff",
639 .data = &sg_big_buff,
640 .maxlen = sizeof (int),
641 .mode = 0444,
642 .proc_handler = proc_dointvec,
643 },
644 #endif
645 #ifdef CONFIG_BSD_PROCESS_ACCT
646 {
647 .procname = "acct",
648 .data = &acct_parm,
649 .maxlen = 3*sizeof(int),
650 .mode = 0644,
651 .proc_handler = proc_dointvec,
652 },
653 #endif
654 #ifdef CONFIG_MAGIC_SYSRQ
655 {
656 .procname = "sysrq",
657 .data = &__sysrq_enabled,
658 .maxlen = sizeof (int),
659 .mode = 0644,
660 .proc_handler = sysrq_sysctl_handler,
661 },
662 #endif
663 #ifdef CONFIG_PROC_SYSCTL
664 {
665 .procname = "cad_pid",
666 .data = NULL,
667 .maxlen = sizeof (int),
668 .mode = 0600,
669 .proc_handler = proc_do_cad_pid,
670 },
671 #endif
672 {
673 .procname = "threads-max",
674 .data = &max_threads,
675 .maxlen = sizeof(int),
676 .mode = 0644,
677 .proc_handler = proc_dointvec,
678 },
679 {
680 .procname = "random",
681 .mode = 0555,
682 .child = random_table,
683 },
684 {
685 .procname = "usermodehelper",
686 .mode = 0555,
687 .child = usermodehelper_table,
688 },
689 {
690 .procname = "overflowuid",
691 .data = &overflowuid,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 .proc_handler = proc_dointvec_minmax,
695 .extra1 = &minolduid,
696 .extra2 = &maxolduid,
697 },
698 {
699 .procname = "overflowgid",
700 .data = &overflowgid,
701 .maxlen = sizeof(int),
702 .mode = 0644,
703 .proc_handler = proc_dointvec_minmax,
704 .extra1 = &minolduid,
705 .extra2 = &maxolduid,
706 },
707 #ifdef CONFIG_S390
708 #ifdef CONFIG_MATHEMU
709 {
710 .procname = "ieee_emulation_warnings",
711 .data = &sysctl_ieee_emulation_warnings,
712 .maxlen = sizeof(int),
713 .mode = 0644,
714 .proc_handler = proc_dointvec,
715 },
716 #endif
717 {
718 .procname = "userprocess_debug",
719 .data = &show_unhandled_signals,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = proc_dointvec,
723 },
724 #endif
725 {
726 .procname = "pid_max",
727 .data = &pid_max,
728 .maxlen = sizeof (int),
729 .mode = 0644,
730 .proc_handler = proc_dointvec_minmax,
731 .extra1 = &pid_max_min,
732 .extra2 = &pid_max_max,
733 },
734 {
735 .procname = "panic_on_oops",
736 .data = &panic_on_oops,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = proc_dointvec,
740 },
741 #if defined CONFIG_PRINTK
742 {
743 .procname = "printk",
744 .data = &console_loglevel,
745 .maxlen = 4*sizeof(int),
746 .mode = 0644,
747 .proc_handler = proc_dointvec,
748 },
749 {
750 .procname = "printk_ratelimit",
751 .data = &printk_ratelimit_state.interval,
752 .maxlen = sizeof(int),
753 .mode = 0644,
754 .proc_handler = proc_dointvec_jiffies,
755 },
756 {
757 .procname = "printk_ratelimit_burst",
758 .data = &printk_ratelimit_state.burst,
759 .maxlen = sizeof(int),
760 .mode = 0644,
761 .proc_handler = proc_dointvec,
762 },
763 {
764 .procname = "printk_delay",
765 .data = &printk_delay_msec,
766 .maxlen = sizeof(int),
767 .mode = 0644,
768 .proc_handler = proc_dointvec_minmax,
769 .extra1 = &zero,
770 .extra2 = &ten_thousand,
771 },
772 {
773 .procname = "dmesg_restrict",
774 .data = &dmesg_restrict,
775 .maxlen = sizeof(int),
776 .mode = 0644,
777 .proc_handler = proc_dointvec_minmax_sysadmin,
778 .extra1 = &zero,
779 .extra2 = &one,
780 },
781 {
782 .procname = "kptr_restrict",
783 .data = &kptr_restrict,
784 .maxlen = sizeof(int),
785 .mode = 0644,
786 .proc_handler = proc_dointvec_minmax_sysadmin,
787 .extra1 = &zero,
788 .extra2 = &two,
789 },
790 #endif
791 {
792 .procname = "ngroups_max",
793 .data = &ngroups_max,
794 .maxlen = sizeof (int),
795 .mode = 0444,
796 .proc_handler = proc_dointvec,
797 },
798 {
799 .procname = "cap_last_cap",
800 .data = (void *)&cap_last_cap,
801 .maxlen = sizeof(int),
802 .mode = 0444,
803 .proc_handler = proc_dointvec,
804 },
805 #if defined(CONFIG_LOCKUP_DETECTOR)
806 {
807 .procname = "watchdog",
808 .data = &watchdog_user_enabled,
809 .maxlen = sizeof (int),
810 .mode = 0644,
811 .proc_handler = proc_dowatchdog,
812 .extra1 = &zero,
813 .extra2 = &one,
814 },
815 {
816 .procname = "watchdog_thresh",
817 .data = &watchdog_thresh,
818 .maxlen = sizeof(int),
819 .mode = 0644,
820 .proc_handler = proc_dowatchdog,
821 .extra1 = &zero,
822 .extra2 = &sixty,
823 },
824 {
825 .procname = "softlockup_panic",
826 .data = &softlockup_panic,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec_minmax,
830 .extra1 = &zero,
831 .extra2 = &one,
832 },
833 {
834 .procname = "nmi_watchdog",
835 .data = &watchdog_user_enabled,
836 .maxlen = sizeof (int),
837 .mode = 0644,
838 .proc_handler = proc_dowatchdog,
839 .extra1 = &zero,
840 .extra2 = &one,
841 },
842 #endif
843 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
844 {
845 .procname = "unknown_nmi_panic",
846 .data = &unknown_nmi_panic,
847 .maxlen = sizeof (int),
848 .mode = 0644,
849 .proc_handler = proc_dointvec,
850 },
851 #endif
852 #if defined(CONFIG_X86)
853 {
854 .procname = "panic_on_unrecovered_nmi",
855 .data = &panic_on_unrecovered_nmi,
856 .maxlen = sizeof(int),
857 .mode = 0644,
858 .proc_handler = proc_dointvec,
859 },
860 {
861 .procname = "panic_on_io_nmi",
862 .data = &panic_on_io_nmi,
863 .maxlen = sizeof(int),
864 .mode = 0644,
865 .proc_handler = proc_dointvec,
866 },
867 #ifdef CONFIG_DEBUG_STACKOVERFLOW
868 {
869 .procname = "panic_on_stackoverflow",
870 .data = &sysctl_panic_on_stackoverflow,
871 .maxlen = sizeof(int),
872 .mode = 0644,
873 .proc_handler = proc_dointvec,
874 },
875 #endif
876 {
877 .procname = "bootloader_type",
878 .data = &bootloader_type,
879 .maxlen = sizeof (int),
880 .mode = 0444,
881 .proc_handler = proc_dointvec,
882 },
883 {
884 .procname = "bootloader_version",
885 .data = &bootloader_version,
886 .maxlen = sizeof (int),
887 .mode = 0444,
888 .proc_handler = proc_dointvec,
889 },
890 {
891 .procname = "kstack_depth_to_print",
892 .data = &kstack_depth_to_print,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_dointvec,
896 },
897 {
898 .procname = "io_delay_type",
899 .data = &io_delay_type,
900 .maxlen = sizeof(int),
901 .mode = 0644,
902 .proc_handler = proc_dointvec,
903 },
904 #endif
905 #if defined(CONFIG_MMU)
906 {
907 .procname = "randomize_va_space",
908 .data = &randomize_va_space,
909 .maxlen = sizeof(int),
910 .mode = 0644,
911 .proc_handler = proc_dointvec,
912 },
913 #endif
914 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
915 {
916 .procname = "spin_retry",
917 .data = &spin_retry,
918 .maxlen = sizeof (int),
919 .mode = 0644,
920 .proc_handler = proc_dointvec,
921 },
922 #endif
923 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
924 {
925 .procname = "acpi_video_flags",
926 .data = &acpi_realmode_flags,
927 .maxlen = sizeof (unsigned long),
928 .mode = 0644,
929 .proc_handler = proc_doulongvec_minmax,
930 },
931 #endif
932 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
933 {
934 .procname = "ignore-unaligned-usertrap",
935 .data = &no_unaligned_warning,
936 .maxlen = sizeof (int),
937 .mode = 0644,
938 .proc_handler = proc_dointvec,
939 },
940 #endif
941 #ifdef CONFIG_IA64
942 {
943 .procname = "unaligned-dump-stack",
944 .data = &unaligned_dump_stack,
945 .maxlen = sizeof (int),
946 .mode = 0644,
947 .proc_handler = proc_dointvec,
948 },
949 #endif
950 #ifdef CONFIG_DETECT_HUNG_TASK
951 {
952 .procname = "hung_task_panic",
953 .data = &sysctl_hung_task_panic,
954 .maxlen = sizeof(int),
955 .mode = 0644,
956 .proc_handler = proc_dointvec_minmax,
957 .extra1 = &zero,
958 .extra2 = &one,
959 },
960 {
961 .procname = "hung_task_check_count",
962 .data = &sysctl_hung_task_check_count,
963 .maxlen = sizeof(int),
964 .mode = 0644,
965 .proc_handler = proc_dointvec_minmax,
966 .extra1 = &zero,
967 },
968 {
969 .procname = "hung_task_timeout_secs",
970 .data = &sysctl_hung_task_timeout_secs,
971 .maxlen = sizeof(unsigned long),
972 .mode = 0644,
973 .proc_handler = proc_dohung_task_timeout_secs,
974 },
975 {
976 .procname = "hung_task_warnings",
977 .data = &sysctl_hung_task_warnings,
978 .maxlen = sizeof(unsigned long),
979 .mode = 0644,
980 .proc_handler = proc_doulongvec_minmax,
981 },
982 #endif
983 #ifdef CONFIG_COMPAT
984 {
985 .procname = "compat-log",
986 .data = &compat_log,
987 .maxlen = sizeof (int),
988 .mode = 0644,
989 .proc_handler = proc_dointvec,
990 },
991 #endif
992 #ifdef CONFIG_RT_MUTEXES
993 {
994 .procname = "max_lock_depth",
995 .data = &max_lock_depth,
996 .maxlen = sizeof(int),
997 .mode = 0644,
998 .proc_handler = proc_dointvec,
999 },
1000 #endif
1001 {
1002 .procname = "poweroff_cmd",
1003 .data = &poweroff_cmd,
1004 .maxlen = POWEROFF_CMD_PATH_LEN,
1005 .mode = 0644,
1006 .proc_handler = proc_dostring,
1007 },
1008 #ifdef CONFIG_KEYS
1009 {
1010 .procname = "keys",
1011 .mode = 0555,
1012 .child = key_sysctls,
1013 },
1014 #endif
1015 #ifdef CONFIG_RCU_TORTURE_TEST
1016 {
1017 .procname = "rcutorture_runnable",
1018 .data = &rcutorture_runnable,
1019 .maxlen = sizeof(int),
1020 .mode = 0644,
1021 .proc_handler = proc_dointvec,
1022 },
1023 #endif
1024 #ifdef CONFIG_PERF_EVENTS
1025 /*
1026 * User-space scripts rely on the existence of this file
1027 * as a feature check for perf_events being enabled.
1028 *
1029 * So it's an ABI, do not remove!
1030 */
1031 {
1032 .procname = "perf_event_paranoid",
1033 .data = &sysctl_perf_event_paranoid,
1034 .maxlen = sizeof(sysctl_perf_event_paranoid),
1035 .mode = 0644,
1036 .proc_handler = proc_dointvec,
1037 },
1038 {
1039 .procname = "perf_event_mlock_kb",
1040 .data = &sysctl_perf_event_mlock,
1041 .maxlen = sizeof(sysctl_perf_event_mlock),
1042 .mode = 0644,
1043 .proc_handler = proc_dointvec,
1044 },
1045 {
1046 .procname = "perf_event_max_sample_rate",
1047 .data = &sysctl_perf_event_sample_rate,
1048 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1049 .mode = 0644,
1050 .proc_handler = perf_proc_update_handler,
1051 .extra1 = &one,
1052 },
1053 {
1054 .procname = "perf_cpu_time_max_percent",
1055 .data = &sysctl_perf_cpu_time_max_percent,
1056 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1057 .mode = 0644,
1058 .proc_handler = perf_cpu_time_max_percent_handler,
1059 .extra1 = &zero,
1060 .extra2 = &one_hundred,
1061 },
1062 #endif
1063 #ifdef CONFIG_KMEMCHECK
1064 {
1065 .procname = "kmemcheck",
1066 .data = &kmemcheck_enabled,
1067 .maxlen = sizeof(int),
1068 .mode = 0644,
1069 .proc_handler = proc_dointvec,
1070 },
1071 #endif
1072 #ifdef CONFIG_BLOCK
1073 {
1074 .procname = "blk_iopoll",
1075 .data = &blk_iopoll_enabled,
1076 .maxlen = sizeof(int),
1077 .mode = 0644,
1078 .proc_handler = proc_dointvec,
1079 },
1080 #endif
1081 { }
1082 };
1083
1084 static struct ctl_table vm_table[] = {
1085 {
1086 .procname = "overcommit_memory",
1087 .data = &sysctl_overcommit_memory,
1088 .maxlen = sizeof(sysctl_overcommit_memory),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec_minmax,
1091 .extra1 = &zero,
1092 .extra2 = &two,
1093 },
1094 {
1095 .procname = "panic_on_oom",
1096 .data = &sysctl_panic_on_oom,
1097 .maxlen = sizeof(sysctl_panic_on_oom),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec_minmax,
1100 .extra1 = &zero,
1101 .extra2 = &two,
1102 },
1103 {
1104 .procname = "oom_kill_allocating_task",
1105 .data = &sysctl_oom_kill_allocating_task,
1106 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1107 .mode = 0644,
1108 .proc_handler = proc_dointvec,
1109 },
1110 {
1111 .procname = "oom_dump_tasks",
1112 .data = &sysctl_oom_dump_tasks,
1113 .maxlen = sizeof(sysctl_oom_dump_tasks),
1114 .mode = 0644,
1115 .proc_handler = proc_dointvec,
1116 },
1117 {
1118 .procname = "overcommit_ratio",
1119 .data = &sysctl_overcommit_ratio,
1120 .maxlen = sizeof(sysctl_overcommit_ratio),
1121 .mode = 0644,
1122 .proc_handler = overcommit_ratio_handler,
1123 },
1124 {
1125 .procname = "overcommit_kbytes",
1126 .data = &sysctl_overcommit_kbytes,
1127 .maxlen = sizeof(sysctl_overcommit_kbytes),
1128 .mode = 0644,
1129 .proc_handler = overcommit_kbytes_handler,
1130 },
1131 {
1132 .procname = "page-cluster",
1133 .data = &page_cluster,
1134 .maxlen = sizeof(int),
1135 .mode = 0644,
1136 .proc_handler = proc_dointvec_minmax,
1137 .extra1 = &zero,
1138 },
1139 {
1140 .procname = "dirty_background_ratio",
1141 .data = &dirty_background_ratio,
1142 .maxlen = sizeof(dirty_background_ratio),
1143 .mode = 0644,
1144 .proc_handler = dirty_background_ratio_handler,
1145 .extra1 = &zero,
1146 .extra2 = &one_hundred,
1147 },
1148 {
1149 .procname = "dirty_background_bytes",
1150 .data = &dirty_background_bytes,
1151 .maxlen = sizeof(dirty_background_bytes),
1152 .mode = 0644,
1153 .proc_handler = dirty_background_bytes_handler,
1154 .extra1 = &one_ul,
1155 },
1156 {
1157 .procname = "dirty_ratio",
1158 .data = &vm_dirty_ratio,
1159 .maxlen = sizeof(vm_dirty_ratio),
1160 .mode = 0644,
1161 .proc_handler = dirty_ratio_handler,
1162 .extra1 = &zero,
1163 .extra2 = &one_hundred,
1164 },
1165 {
1166 .procname = "dirty_bytes",
1167 .data = &vm_dirty_bytes,
1168 .maxlen = sizeof(vm_dirty_bytes),
1169 .mode = 0644,
1170 .proc_handler = dirty_bytes_handler,
1171 .extra1 = &dirty_bytes_min,
1172 },
1173 {
1174 .procname = "dirty_writeback_centisecs",
1175 .data = &dirty_writeback_interval,
1176 .maxlen = sizeof(dirty_writeback_interval),
1177 .mode = 0644,
1178 .proc_handler = dirty_writeback_centisecs_handler,
1179 },
1180 {
1181 .procname = "dirty_expire_centisecs",
1182 .data = &dirty_expire_interval,
1183 .maxlen = sizeof(dirty_expire_interval),
1184 .mode = 0644,
1185 .proc_handler = proc_dointvec_minmax,
1186 .extra1 = &zero,
1187 },
1188 {
1189 .procname = "nr_pdflush_threads",
1190 .mode = 0444 /* read-only */,
1191 .proc_handler = pdflush_proc_obsolete,
1192 },
1193 {
1194 .procname = "swappiness",
1195 .data = &vm_swappiness,
1196 .maxlen = sizeof(vm_swappiness),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_minmax,
1199 .extra1 = &zero,
1200 .extra2 = &one_hundred,
1201 },
1202 #ifdef CONFIG_HUGETLB_PAGE
1203 {
1204 .procname = "nr_hugepages",
1205 .data = NULL,
1206 .maxlen = sizeof(unsigned long),
1207 .mode = 0644,
1208 .proc_handler = hugetlb_sysctl_handler,
1209 .extra1 = (void *)&hugetlb_zero,
1210 .extra2 = (void *)&hugetlb_infinity,
1211 },
1212 #ifdef CONFIG_NUMA
1213 {
1214 .procname = "nr_hugepages_mempolicy",
1215 .data = NULL,
1216 .maxlen = sizeof(unsigned long),
1217 .mode = 0644,
1218 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1219 .extra1 = (void *)&hugetlb_zero,
1220 .extra2 = (void *)&hugetlb_infinity,
1221 },
1222 #endif
1223 {
1224 .procname = "hugetlb_shm_group",
1225 .data = &sysctl_hugetlb_shm_group,
1226 .maxlen = sizeof(gid_t),
1227 .mode = 0644,
1228 .proc_handler = proc_dointvec,
1229 },
1230 {
1231 .procname = "hugepages_treat_as_movable",
1232 .data = &hugepages_treat_as_movable,
1233 .maxlen = sizeof(int),
1234 .mode = 0644,
1235 .proc_handler = proc_dointvec,
1236 },
1237 {
1238 .procname = "nr_overcommit_hugepages",
1239 .data = NULL,
1240 .maxlen = sizeof(unsigned long),
1241 .mode = 0644,
1242 .proc_handler = hugetlb_overcommit_handler,
1243 .extra1 = (void *)&hugetlb_zero,
1244 .extra2 = (void *)&hugetlb_infinity,
1245 },
1246 #endif
1247 {
1248 .procname = "lowmem_reserve_ratio",
1249 .data = &sysctl_lowmem_reserve_ratio,
1250 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1251 .mode = 0644,
1252 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1253 },
1254 {
1255 .procname = "drop_caches",
1256 .data = &sysctl_drop_caches,
1257 .maxlen = sizeof(int),
1258 .mode = 0644,
1259 .proc_handler = drop_caches_sysctl_handler,
1260 .extra1 = &one,
1261 .extra2 = &three,
1262 },
1263 #ifdef CONFIG_COMPACTION
1264 {
1265 .procname = "compact_memory",
1266 .data = &sysctl_compact_memory,
1267 .maxlen = sizeof(int),
1268 .mode = 0200,
1269 .proc_handler = sysctl_compaction_handler,
1270 },
1271 {
1272 .procname = "extfrag_threshold",
1273 .data = &sysctl_extfrag_threshold,
1274 .maxlen = sizeof(int),
1275 .mode = 0644,
1276 .proc_handler = sysctl_extfrag_handler,
1277 .extra1 = &min_extfrag_threshold,
1278 .extra2 = &max_extfrag_threshold,
1279 },
1280
1281 #endif /* CONFIG_COMPACTION */
1282 {
1283 .procname = "min_free_kbytes",
1284 .data = &min_free_kbytes,
1285 .maxlen = sizeof(min_free_kbytes),
1286 .mode = 0644,
1287 .proc_handler = min_free_kbytes_sysctl_handler,
1288 .extra1 = &zero,
1289 },
1290 {
1291 .procname = "percpu_pagelist_fraction",
1292 .data = &percpu_pagelist_fraction,
1293 .maxlen = sizeof(percpu_pagelist_fraction),
1294 .mode = 0644,
1295 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1296 .extra1 = &min_percpu_pagelist_fract,
1297 },
1298 #ifdef CONFIG_MMU
1299 {
1300 .procname = "max_map_count",
1301 .data = &sysctl_max_map_count,
1302 .maxlen = sizeof(sysctl_max_map_count),
1303 .mode = 0644,
1304 .proc_handler = proc_dointvec_minmax,
1305 .extra1 = &zero,
1306 },
1307 #else
1308 {
1309 .procname = "nr_trim_pages",
1310 .data = &sysctl_nr_trim_pages,
1311 .maxlen = sizeof(sysctl_nr_trim_pages),
1312 .mode = 0644,
1313 .proc_handler = proc_dointvec_minmax,
1314 .extra1 = &zero,
1315 },
1316 #endif
1317 {
1318 .procname = "laptop_mode",
1319 .data = &laptop_mode,
1320 .maxlen = sizeof(laptop_mode),
1321 .mode = 0644,
1322 .proc_handler = proc_dointvec_jiffies,
1323 },
1324 {
1325 .procname = "block_dump",
1326 .data = &block_dump,
1327 .maxlen = sizeof(block_dump),
1328 .mode = 0644,
1329 .proc_handler = proc_dointvec,
1330 .extra1 = &zero,
1331 },
1332 {
1333 .procname = "vfs_cache_pressure",
1334 .data = &sysctl_vfs_cache_pressure,
1335 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1336 .mode = 0644,
1337 .proc_handler = proc_dointvec,
1338 .extra1 = &zero,
1339 },
1340 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1341 {
1342 .procname = "legacy_va_layout",
1343 .data = &sysctl_legacy_va_layout,
1344 .maxlen = sizeof(sysctl_legacy_va_layout),
1345 .mode = 0644,
1346 .proc_handler = proc_dointvec,
1347 .extra1 = &zero,
1348 },
1349 #endif
1350 #ifdef CONFIG_NUMA
1351 {
1352 .procname = "zone_reclaim_mode",
1353 .data = &zone_reclaim_mode,
1354 .maxlen = sizeof(zone_reclaim_mode),
1355 .mode = 0644,
1356 .proc_handler = proc_dointvec,
1357 .extra1 = &zero,
1358 },
1359 {
1360 .procname = "min_unmapped_ratio",
1361 .data = &sysctl_min_unmapped_ratio,
1362 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1363 .mode = 0644,
1364 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1365 .extra1 = &zero,
1366 .extra2 = &one_hundred,
1367 },
1368 {
1369 .procname = "min_slab_ratio",
1370 .data = &sysctl_min_slab_ratio,
1371 .maxlen = sizeof(sysctl_min_slab_ratio),
1372 .mode = 0644,
1373 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1374 .extra1 = &zero,
1375 .extra2 = &one_hundred,
1376 },
1377 #endif
1378 #ifdef CONFIG_SMP
1379 {
1380 .procname = "stat_interval",
1381 .data = &sysctl_stat_interval,
1382 .maxlen = sizeof(sysctl_stat_interval),
1383 .mode = 0644,
1384 .proc_handler = proc_dointvec_jiffies,
1385 },
1386 #endif
1387 #ifdef CONFIG_MMU
1388 {
1389 .procname = "mmap_min_addr",
1390 .data = &dac_mmap_min_addr,
1391 .maxlen = sizeof(unsigned long),
1392 .mode = 0644,
1393 .proc_handler = mmap_min_addr_handler,
1394 },
1395 #endif
1396 #ifdef CONFIG_NUMA
1397 {
1398 .procname = "numa_zonelist_order",
1399 .data = &numa_zonelist_order,
1400 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1401 .mode = 0644,
1402 .proc_handler = numa_zonelist_order_handler,
1403 },
1404 #endif
1405 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1406 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1407 {
1408 .procname = "vdso_enabled",
1409 .data = &vdso_enabled,
1410 .maxlen = sizeof(vdso_enabled),
1411 .mode = 0644,
1412 .proc_handler = proc_dointvec,
1413 .extra1 = &zero,
1414 },
1415 #endif
1416 #ifdef CONFIG_HIGHMEM
1417 {
1418 .procname = "highmem_is_dirtyable",
1419 .data = &vm_highmem_is_dirtyable,
1420 .maxlen = sizeof(vm_highmem_is_dirtyable),
1421 .mode = 0644,
1422 .proc_handler = proc_dointvec_minmax,
1423 .extra1 = &zero,
1424 .extra2 = &one,
1425 },
1426 #endif
1427 {
1428 .procname = "scan_unevictable_pages",
1429 .data = &scan_unevictable_pages,
1430 .maxlen = sizeof(scan_unevictable_pages),
1431 .mode = 0644,
1432 .proc_handler = scan_unevictable_handler,
1433 },
1434 #ifdef CONFIG_MEMORY_FAILURE
1435 {
1436 .procname = "memory_failure_early_kill",
1437 .data = &sysctl_memory_failure_early_kill,
1438 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1439 .mode = 0644,
1440 .proc_handler = proc_dointvec_minmax,
1441 .extra1 = &zero,
1442 .extra2 = &one,
1443 },
1444 {
1445 .procname = "memory_failure_recovery",
1446 .data = &sysctl_memory_failure_recovery,
1447 .maxlen = sizeof(sysctl_memory_failure_recovery),
1448 .mode = 0644,
1449 .proc_handler = proc_dointvec_minmax,
1450 .extra1 = &zero,
1451 .extra2 = &one,
1452 },
1453 #endif
1454 {
1455 .procname = "user_reserve_kbytes",
1456 .data = &sysctl_user_reserve_kbytes,
1457 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1458 .mode = 0644,
1459 .proc_handler = proc_doulongvec_minmax,
1460 },
1461 {
1462 .procname = "admin_reserve_kbytes",
1463 .data = &sysctl_admin_reserve_kbytes,
1464 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1465 .mode = 0644,
1466 .proc_handler = proc_doulongvec_minmax,
1467 },
1468 { }
1469 };
1470
1471 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1472 static struct ctl_table binfmt_misc_table[] = {
1473 { }
1474 };
1475 #endif
1476
1477 static struct ctl_table fs_table[] = {
1478 {
1479 .procname = "inode-nr",
1480 .data = &inodes_stat,
1481 .maxlen = 2*sizeof(long),
1482 .mode = 0444,
1483 .proc_handler = proc_nr_inodes,
1484 },
1485 {
1486 .procname = "inode-state",
1487 .data = &inodes_stat,
1488 .maxlen = 7*sizeof(long),
1489 .mode = 0444,
1490 .proc_handler = proc_nr_inodes,
1491 },
1492 {
1493 .procname = "file-nr",
1494 .data = &files_stat,
1495 .maxlen = sizeof(files_stat),
1496 .mode = 0444,
1497 .proc_handler = proc_nr_files,
1498 },
1499 {
1500 .procname = "file-max",
1501 .data = &files_stat.max_files,
1502 .maxlen = sizeof(files_stat.max_files),
1503 .mode = 0644,
1504 .proc_handler = proc_doulongvec_minmax,
1505 },
1506 {
1507 .procname = "nr_open",
1508 .data = &sysctl_nr_open,
1509 .maxlen = sizeof(int),
1510 .mode = 0644,
1511 .proc_handler = proc_dointvec_minmax,
1512 .extra1 = &sysctl_nr_open_min,
1513 .extra2 = &sysctl_nr_open_max,
1514 },
1515 {
1516 .procname = "dentry-state",
1517 .data = &dentry_stat,
1518 .maxlen = 6*sizeof(long),
1519 .mode = 0444,
1520 .proc_handler = proc_nr_dentry,
1521 },
1522 {
1523 .procname = "overflowuid",
1524 .data = &fs_overflowuid,
1525 .maxlen = sizeof(int),
1526 .mode = 0644,
1527 .proc_handler = proc_dointvec_minmax,
1528 .extra1 = &minolduid,
1529 .extra2 = &maxolduid,
1530 },
1531 {
1532 .procname = "overflowgid",
1533 .data = &fs_overflowgid,
1534 .maxlen = sizeof(int),
1535 .mode = 0644,
1536 .proc_handler = proc_dointvec_minmax,
1537 .extra1 = &minolduid,
1538 .extra2 = &maxolduid,
1539 },
1540 #ifdef CONFIG_FILE_LOCKING
1541 {
1542 .procname = "leases-enable",
1543 .data = &leases_enable,
1544 .maxlen = sizeof(int),
1545 .mode = 0644,
1546 .proc_handler = proc_dointvec,
1547 },
1548 #endif
1549 #ifdef CONFIG_DNOTIFY
1550 {
1551 .procname = "dir-notify-enable",
1552 .data = &dir_notify_enable,
1553 .maxlen = sizeof(int),
1554 .mode = 0644,
1555 .proc_handler = proc_dointvec,
1556 },
1557 #endif
1558 #ifdef CONFIG_MMU
1559 #ifdef CONFIG_FILE_LOCKING
1560 {
1561 .procname = "lease-break-time",
1562 .data = &lease_break_time,
1563 .maxlen = sizeof(int),
1564 .mode = 0644,
1565 .proc_handler = proc_dointvec,
1566 },
1567 #endif
1568 #ifdef CONFIG_AIO
1569 {
1570 .procname = "aio-nr",
1571 .data = &aio_nr,
1572 .maxlen = sizeof(aio_nr),
1573 .mode = 0444,
1574 .proc_handler = proc_doulongvec_minmax,
1575 },
1576 {
1577 .procname = "aio-max-nr",
1578 .data = &aio_max_nr,
1579 .maxlen = sizeof(aio_max_nr),
1580 .mode = 0644,
1581 .proc_handler = proc_doulongvec_minmax,
1582 },
1583 #endif /* CONFIG_AIO */
1584 #ifdef CONFIG_INOTIFY_USER
1585 {
1586 .procname = "inotify",
1587 .mode = 0555,
1588 .child = inotify_table,
1589 },
1590 #endif
1591 #ifdef CONFIG_EPOLL
1592 {
1593 .procname = "epoll",
1594 .mode = 0555,
1595 .child = epoll_table,
1596 },
1597 #endif
1598 #endif
1599 {
1600 .procname = "protected_symlinks",
1601 .data = &sysctl_protected_symlinks,
1602 .maxlen = sizeof(int),
1603 .mode = 0600,
1604 .proc_handler = proc_dointvec_minmax,
1605 .extra1 = &zero,
1606 .extra2 = &one,
1607 },
1608 {
1609 .procname = "protected_hardlinks",
1610 .data = &sysctl_protected_hardlinks,
1611 .maxlen = sizeof(int),
1612 .mode = 0600,
1613 .proc_handler = proc_dointvec_minmax,
1614 .extra1 = &zero,
1615 .extra2 = &one,
1616 },
1617 {
1618 .procname = "suid_dumpable",
1619 .data = &suid_dumpable,
1620 .maxlen = sizeof(int),
1621 .mode = 0644,
1622 .proc_handler = proc_dointvec_minmax_coredump,
1623 .extra1 = &zero,
1624 .extra2 = &two,
1625 },
1626 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1627 {
1628 .procname = "binfmt_misc",
1629 .mode = 0555,
1630 .child = binfmt_misc_table,
1631 },
1632 #endif
1633 {
1634 .procname = "pipe-max-size",
1635 .data = &pipe_max_size,
1636 .maxlen = sizeof(int),
1637 .mode = 0644,
1638 .proc_handler = &pipe_proc_fn,
1639 .extra1 = &pipe_min_size,
1640 },
1641 { }
1642 };
1643
1644 static struct ctl_table debug_table[] = {
1645 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1646 {
1647 .procname = "exception-trace",
1648 .data = &show_unhandled_signals,
1649 .maxlen = sizeof(int),
1650 .mode = 0644,
1651 .proc_handler = proc_dointvec
1652 },
1653 #endif
1654 #if defined(CONFIG_OPTPROBES)
1655 {
1656 .procname = "kprobes-optimization",
1657 .data = &sysctl_kprobes_optimization,
1658 .maxlen = sizeof(int),
1659 .mode = 0644,
1660 .proc_handler = proc_kprobes_optimization_handler,
1661 .extra1 = &zero,
1662 .extra2 = &one,
1663 },
1664 #endif
1665 { }
1666 };
1667
1668 static struct ctl_table dev_table[] = {
1669 { }
1670 };
1671
1672 int __init sysctl_init(void)
1673 {
1674 struct ctl_table_header *hdr;
1675
1676 hdr = register_sysctl_table(sysctl_base_table);
1677 kmemleak_not_leak(hdr);
1678 return 0;
1679 }
1680
1681 #endif /* CONFIG_SYSCTL */
1682
1683 /*
1684 * /proc/sys support
1685 */
1686
1687 #ifdef CONFIG_PROC_SYSCTL
1688
1689 static int _proc_do_string(void* data, int maxlen, int write,
1690 void __user *buffer,
1691 size_t *lenp, loff_t *ppos)
1692 {
1693 size_t len;
1694 char __user *p;
1695 char c;
1696
1697 if (!data || !maxlen || !*lenp) {
1698 *lenp = 0;
1699 return 0;
1700 }
1701
1702 if (write) {
1703 len = 0;
1704 p = buffer;
1705 while (len < *lenp) {
1706 if (get_user(c, p++))
1707 return -EFAULT;
1708 if (c == 0 || c == '\n')
1709 break;
1710 len++;
1711 }
1712 if (len >= maxlen)
1713 len = maxlen-1;
1714 if(copy_from_user(data, buffer, len))
1715 return -EFAULT;
1716 ((char *) data)[len] = 0;
1717 *ppos += *lenp;
1718 } else {
1719 len = strlen(data);
1720 if (len > maxlen)
1721 len = maxlen;
1722
1723 if (*ppos > len) {
1724 *lenp = 0;
1725 return 0;
1726 }
1727
1728 data += *ppos;
1729 len -= *ppos;
1730
1731 if (len > *lenp)
1732 len = *lenp;
1733 if (len)
1734 if(copy_to_user(buffer, data, len))
1735 return -EFAULT;
1736 if (len < *lenp) {
1737 if(put_user('\n', ((char __user *) buffer) + len))
1738 return -EFAULT;
1739 len++;
1740 }
1741 *lenp = len;
1742 *ppos += len;
1743 }
1744 return 0;
1745 }
1746
1747 /**
1748 * proc_dostring - read a string sysctl
1749 * @table: the sysctl table
1750 * @write: %TRUE if this is a write to the sysctl file
1751 * @buffer: the user buffer
1752 * @lenp: the size of the user buffer
1753 * @ppos: file position
1754 *
1755 * Reads/writes a string from/to the user buffer. If the kernel
1756 * buffer provided is not large enough to hold the string, the
1757 * string is truncated. The copied string is %NULL-terminated.
1758 * If the string is being read by the user process, it is copied
1759 * and a newline '\n' is added. It is truncated if the buffer is
1760 * not large enough.
1761 *
1762 * Returns 0 on success.
1763 */
1764 int proc_dostring(struct ctl_table *table, int write,
1765 void __user *buffer, size_t *lenp, loff_t *ppos)
1766 {
1767 return _proc_do_string(table->data, table->maxlen, write,
1768 buffer, lenp, ppos);
1769 }
1770
1771 static size_t proc_skip_spaces(char **buf)
1772 {
1773 size_t ret;
1774 char *tmp = skip_spaces(*buf);
1775 ret = tmp - *buf;
1776 *buf = tmp;
1777 return ret;
1778 }
1779
1780 static void proc_skip_char(char **buf, size_t *size, const char v)
1781 {
1782 while (*size) {
1783 if (**buf != v)
1784 break;
1785 (*size)--;
1786 (*buf)++;
1787 }
1788 }
1789
1790 #define TMPBUFLEN 22
1791 /**
1792 * proc_get_long - reads an ASCII formatted integer from a user buffer
1793 *
1794 * @buf: a kernel buffer
1795 * @size: size of the kernel buffer
1796 * @val: this is where the number will be stored
1797 * @neg: set to %TRUE if number is negative
1798 * @perm_tr: a vector which contains the allowed trailers
1799 * @perm_tr_len: size of the perm_tr vector
1800 * @tr: pointer to store the trailer character
1801 *
1802 * In case of success %0 is returned and @buf and @size are updated with
1803 * the amount of bytes read. If @tr is non-NULL and a trailing
1804 * character exists (size is non-zero after returning from this
1805 * function), @tr is updated with the trailing character.
1806 */
1807 static int proc_get_long(char **buf, size_t *size,
1808 unsigned long *val, bool *neg,
1809 const char *perm_tr, unsigned perm_tr_len, char *tr)
1810 {
1811 int len;
1812 char *p, tmp[TMPBUFLEN];
1813
1814 if (!*size)
1815 return -EINVAL;
1816
1817 len = *size;
1818 if (len > TMPBUFLEN - 1)
1819 len = TMPBUFLEN - 1;
1820
1821 memcpy(tmp, *buf, len);
1822
1823 tmp[len] = 0;
1824 p = tmp;
1825 if (*p == '-' && *size > 1) {
1826 *neg = true;
1827 p++;
1828 } else
1829 *neg = false;
1830 if (!isdigit(*p))
1831 return -EINVAL;
1832
1833 *val = simple_strtoul(p, &p, 0);
1834
1835 len = p - tmp;
1836
1837 /* We don't know if the next char is whitespace thus we may accept
1838 * invalid integers (e.g. 1234...a) or two integers instead of one
1839 * (e.g. 123...1). So lets not allow such large numbers. */
1840 if (len == TMPBUFLEN - 1)
1841 return -EINVAL;
1842
1843 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1844 return -EINVAL;
1845
1846 if (tr && (len < *size))
1847 *tr = *p;
1848
1849 *buf += len;
1850 *size -= len;
1851
1852 return 0;
1853 }
1854
1855 /**
1856 * proc_put_long - converts an integer to a decimal ASCII formatted string
1857 *
1858 * @buf: the user buffer
1859 * @size: the size of the user buffer
1860 * @val: the integer to be converted
1861 * @neg: sign of the number, %TRUE for negative
1862 *
1863 * In case of success %0 is returned and @buf and @size are updated with
1864 * the amount of bytes written.
1865 */
1866 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1867 bool neg)
1868 {
1869 int len;
1870 char tmp[TMPBUFLEN], *p = tmp;
1871
1872 sprintf(p, "%s%lu", neg ? "-" : "", val);
1873 len = strlen(tmp);
1874 if (len > *size)
1875 len = *size;
1876 if (copy_to_user(*buf, tmp, len))
1877 return -EFAULT;
1878 *size -= len;
1879 *buf += len;
1880 return 0;
1881 }
1882 #undef TMPBUFLEN
1883
1884 static int proc_put_char(void __user **buf, size_t *size, char c)
1885 {
1886 if (*size) {
1887 char __user **buffer = (char __user **)buf;
1888 if (put_user(c, *buffer))
1889 return -EFAULT;
1890 (*size)--, (*buffer)++;
1891 *buf = *buffer;
1892 }
1893 return 0;
1894 }
1895
1896 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1897 int *valp,
1898 int write, void *data)
1899 {
1900 if (write) {
1901 *valp = *negp ? -*lvalp : *lvalp;
1902 } else {
1903 int val = *valp;
1904 if (val < 0) {
1905 *negp = true;
1906 *lvalp = (unsigned long)-val;
1907 } else {
1908 *negp = false;
1909 *lvalp = (unsigned long)val;
1910 }
1911 }
1912 return 0;
1913 }
1914
1915 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1916
1917 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1918 int write, void __user *buffer,
1919 size_t *lenp, loff_t *ppos,
1920 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1921 int write, void *data),
1922 void *data)
1923 {
1924 int *i, vleft, first = 1, err = 0;
1925 unsigned long page = 0;
1926 size_t left;
1927 char *kbuf;
1928
1929 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1930 *lenp = 0;
1931 return 0;
1932 }
1933
1934 i = (int *) tbl_data;
1935 vleft = table->maxlen / sizeof(*i);
1936 left = *lenp;
1937
1938 if (!conv)
1939 conv = do_proc_dointvec_conv;
1940
1941 if (write) {
1942 if (left > PAGE_SIZE - 1)
1943 left = PAGE_SIZE - 1;
1944 page = __get_free_page(GFP_TEMPORARY);
1945 kbuf = (char *) page;
1946 if (!kbuf)
1947 return -ENOMEM;
1948 if (copy_from_user(kbuf, buffer, left)) {
1949 err = -EFAULT;
1950 goto free;
1951 }
1952 kbuf[left] = 0;
1953 }
1954
1955 for (; left && vleft--; i++, first=0) {
1956 unsigned long lval;
1957 bool neg;
1958
1959 if (write) {
1960 left -= proc_skip_spaces(&kbuf);
1961
1962 if (!left)
1963 break;
1964 err = proc_get_long(&kbuf, &left, &lval, &neg,
1965 proc_wspace_sep,
1966 sizeof(proc_wspace_sep), NULL);
1967 if (err)
1968 break;
1969 if (conv(&neg, &lval, i, 1, data)) {
1970 err = -EINVAL;
1971 break;
1972 }
1973 } else {
1974 if (conv(&neg, &lval, i, 0, data)) {
1975 err = -EINVAL;
1976 break;
1977 }
1978 if (!first)
1979 err = proc_put_char(&buffer, &left, '\t');
1980 if (err)
1981 break;
1982 err = proc_put_long(&buffer, &left, lval, neg);
1983 if (err)
1984 break;
1985 }
1986 }
1987
1988 if (!write && !first && left && !err)
1989 err = proc_put_char(&buffer, &left, '\n');
1990 if (write && !err && left)
1991 left -= proc_skip_spaces(&kbuf);
1992 free:
1993 if (write) {
1994 free_page(page);
1995 if (first)
1996 return err ? : -EINVAL;
1997 }
1998 *lenp -= left;
1999 *ppos += *lenp;
2000 return err;
2001 }
2002
2003 static int do_proc_dointvec(struct ctl_table *table, int write,
2004 void __user *buffer, size_t *lenp, loff_t *ppos,
2005 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2006 int write, void *data),
2007 void *data)
2008 {
2009 return __do_proc_dointvec(table->data, table, write,
2010 buffer, lenp, ppos, conv, data);
2011 }
2012
2013 /**
2014 * proc_dointvec - read a vector of integers
2015 * @table: the sysctl table
2016 * @write: %TRUE if this is a write to the sysctl file
2017 * @buffer: the user buffer
2018 * @lenp: the size of the user buffer
2019 * @ppos: file position
2020 *
2021 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2022 * values from/to the user buffer, treated as an ASCII string.
2023 *
2024 * Returns 0 on success.
2025 */
2026 int proc_dointvec(struct ctl_table *table, int write,
2027 void __user *buffer, size_t *lenp, loff_t *ppos)
2028 {
2029 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2030 NULL,NULL);
2031 }
2032
2033 /*
2034 * Taint values can only be increased
2035 * This means we can safely use a temporary.
2036 */
2037 static int proc_taint(struct ctl_table *table, int write,
2038 void __user *buffer, size_t *lenp, loff_t *ppos)
2039 {
2040 struct ctl_table t;
2041 unsigned long tmptaint = get_taint();
2042 int err;
2043
2044 if (write && !capable(CAP_SYS_ADMIN))
2045 return -EPERM;
2046
2047 t = *table;
2048 t.data = &tmptaint;
2049 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2050 if (err < 0)
2051 return err;
2052
2053 if (write) {
2054 /*
2055 * Poor man's atomic or. Not worth adding a primitive
2056 * to everyone's atomic.h for this
2057 */
2058 int i;
2059 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2060 if ((tmptaint >> i) & 1)
2061 add_taint(i, LOCKDEP_STILL_OK);
2062 }
2063 }
2064
2065 return err;
2066 }
2067
2068 #ifdef CONFIG_PRINTK
2069 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2070 void __user *buffer, size_t *lenp, loff_t *ppos)
2071 {
2072 if (write && !capable(CAP_SYS_ADMIN))
2073 return -EPERM;
2074
2075 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2076 }
2077 #endif
2078
2079 struct do_proc_dointvec_minmax_conv_param {
2080 int *min;
2081 int *max;
2082 };
2083
2084 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2085 int *valp,
2086 int write, void *data)
2087 {
2088 struct do_proc_dointvec_minmax_conv_param *param = data;
2089 if (write) {
2090 int val = *negp ? -*lvalp : *lvalp;
2091 if ((param->min && *param->min > val) ||
2092 (param->max && *param->max < val))
2093 return -EINVAL;
2094 *valp = val;
2095 } else {
2096 int val = *valp;
2097 if (val < 0) {
2098 *negp = true;
2099 *lvalp = (unsigned long)-val;
2100 } else {
2101 *negp = false;
2102 *lvalp = (unsigned long)val;
2103 }
2104 }
2105 return 0;
2106 }
2107
2108 /**
2109 * proc_dointvec_minmax - read a vector of integers with min/max values
2110 * @table: the sysctl table
2111 * @write: %TRUE if this is a write to the sysctl file
2112 * @buffer: the user buffer
2113 * @lenp: the size of the user buffer
2114 * @ppos: file position
2115 *
2116 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2117 * values from/to the user buffer, treated as an ASCII string.
2118 *
2119 * This routine will ensure the values are within the range specified by
2120 * table->extra1 (min) and table->extra2 (max).
2121 *
2122 * Returns 0 on success.
2123 */
2124 int proc_dointvec_minmax(struct ctl_table *table, int write,
2125 void __user *buffer, size_t *lenp, loff_t *ppos)
2126 {
2127 struct do_proc_dointvec_minmax_conv_param param = {
2128 .min = (int *) table->extra1,
2129 .max = (int *) table->extra2,
2130 };
2131 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2132 do_proc_dointvec_minmax_conv, &param);
2133 }
2134
2135 static void validate_coredump_safety(void)
2136 {
2137 #ifdef CONFIG_COREDUMP
2138 if (suid_dumpable == SUID_DUMP_ROOT &&
2139 core_pattern[0] != '/' && core_pattern[0] != '|') {
2140 printk(KERN_WARNING "Unsafe core_pattern used with "\
2141 "suid_dumpable=2. Pipe handler or fully qualified "\
2142 "core dump path required.\n");
2143 }
2144 #endif
2145 }
2146
2147 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2148 void __user *buffer, size_t *lenp, loff_t *ppos)
2149 {
2150 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2151 if (!error)
2152 validate_coredump_safety();
2153 return error;
2154 }
2155
2156 #ifdef CONFIG_COREDUMP
2157 static int proc_dostring_coredump(struct ctl_table *table, int write,
2158 void __user *buffer, size_t *lenp, loff_t *ppos)
2159 {
2160 int error = proc_dostring(table, write, buffer, lenp, ppos);
2161 if (!error)
2162 validate_coredump_safety();
2163 return error;
2164 }
2165 #endif
2166
2167 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2168 void __user *buffer,
2169 size_t *lenp, loff_t *ppos,
2170 unsigned long convmul,
2171 unsigned long convdiv)
2172 {
2173 unsigned long *i, *min, *max;
2174 int vleft, first = 1, err = 0;
2175 unsigned long page = 0;
2176 size_t left;
2177 char *kbuf;
2178
2179 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2180 *lenp = 0;
2181 return 0;
2182 }
2183
2184 i = (unsigned long *) data;
2185 min = (unsigned long *) table->extra1;
2186 max = (unsigned long *) table->extra2;
2187 vleft = table->maxlen / sizeof(unsigned long);
2188 left = *lenp;
2189
2190 if (write) {
2191 if (left > PAGE_SIZE - 1)
2192 left = PAGE_SIZE - 1;
2193 page = __get_free_page(GFP_TEMPORARY);
2194 kbuf = (char *) page;
2195 if (!kbuf)
2196 return -ENOMEM;
2197 if (copy_from_user(kbuf, buffer, left)) {
2198 err = -EFAULT;
2199 goto free;
2200 }
2201 kbuf[left] = 0;
2202 }
2203
2204 for (; left && vleft--; i++, first = 0) {
2205 unsigned long val;
2206
2207 if (write) {
2208 bool neg;
2209
2210 left -= proc_skip_spaces(&kbuf);
2211
2212 err = proc_get_long(&kbuf, &left, &val, &neg,
2213 proc_wspace_sep,
2214 sizeof(proc_wspace_sep), NULL);
2215 if (err)
2216 break;
2217 if (neg)
2218 continue;
2219 if ((min && val < *min) || (max && val > *max))
2220 continue;
2221 *i = val;
2222 } else {
2223 val = convdiv * (*i) / convmul;
2224 if (!first) {
2225 err = proc_put_char(&buffer, &left, '\t');
2226 if (err)
2227 break;
2228 }
2229 err = proc_put_long(&buffer, &left, val, false);
2230 if (err)
2231 break;
2232 }
2233 }
2234
2235 if (!write && !first && left && !err)
2236 err = proc_put_char(&buffer, &left, '\n');
2237 if (write && !err)
2238 left -= proc_skip_spaces(&kbuf);
2239 free:
2240 if (write) {
2241 free_page(page);
2242 if (first)
2243 return err ? : -EINVAL;
2244 }
2245 *lenp -= left;
2246 *ppos += *lenp;
2247 return err;
2248 }
2249
2250 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2251 void __user *buffer,
2252 size_t *lenp, loff_t *ppos,
2253 unsigned long convmul,
2254 unsigned long convdiv)
2255 {
2256 return __do_proc_doulongvec_minmax(table->data, table, write,
2257 buffer, lenp, ppos, convmul, convdiv);
2258 }
2259
2260 /**
2261 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2262 * @table: the sysctl table
2263 * @write: %TRUE if this is a write to the sysctl file
2264 * @buffer: the user buffer
2265 * @lenp: the size of the user buffer
2266 * @ppos: file position
2267 *
2268 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2269 * values from/to the user buffer, treated as an ASCII string.
2270 *
2271 * This routine will ensure the values are within the range specified by
2272 * table->extra1 (min) and table->extra2 (max).
2273 *
2274 * Returns 0 on success.
2275 */
2276 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2277 void __user *buffer, size_t *lenp, loff_t *ppos)
2278 {
2279 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2280 }
2281
2282 /**
2283 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2284 * @table: the sysctl table
2285 * @write: %TRUE if this is a write to the sysctl file
2286 * @buffer: the user buffer
2287 * @lenp: the size of the user buffer
2288 * @ppos: file position
2289 *
2290 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2291 * values from/to the user buffer, treated as an ASCII string. The values
2292 * are treated as milliseconds, and converted to jiffies when they are stored.
2293 *
2294 * This routine will ensure the values are within the range specified by
2295 * table->extra1 (min) and table->extra2 (max).
2296 *
2297 * Returns 0 on success.
2298 */
2299 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2300 void __user *buffer,
2301 size_t *lenp, loff_t *ppos)
2302 {
2303 return do_proc_doulongvec_minmax(table, write, buffer,
2304 lenp, ppos, HZ, 1000l);
2305 }
2306
2307
2308 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2309 int *valp,
2310 int write, void *data)
2311 {
2312 if (write) {
2313 if (*lvalp > LONG_MAX / HZ)
2314 return 1;
2315 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2316 } else {
2317 int val = *valp;
2318 unsigned long lval;
2319 if (val < 0) {
2320 *negp = true;
2321 lval = (unsigned long)-val;
2322 } else {
2323 *negp = false;
2324 lval = (unsigned long)val;
2325 }
2326 *lvalp = lval / HZ;
2327 }
2328 return 0;
2329 }
2330
2331 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2332 int *valp,
2333 int write, void *data)
2334 {
2335 if (write) {
2336 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2337 return 1;
2338 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2339 } else {
2340 int val = *valp;
2341 unsigned long lval;
2342 if (val < 0) {
2343 *negp = true;
2344 lval = (unsigned long)-val;
2345 } else {
2346 *negp = false;
2347 lval = (unsigned long)val;
2348 }
2349 *lvalp = jiffies_to_clock_t(lval);
2350 }
2351 return 0;
2352 }
2353
2354 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2355 int *valp,
2356 int write, void *data)
2357 {
2358 if (write) {
2359 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2360
2361 if (jif > INT_MAX)
2362 return 1;
2363 *valp = (int)jif;
2364 } else {
2365 int val = *valp;
2366 unsigned long lval;
2367 if (val < 0) {
2368 *negp = true;
2369 lval = (unsigned long)-val;
2370 } else {
2371 *negp = false;
2372 lval = (unsigned long)val;
2373 }
2374 *lvalp = jiffies_to_msecs(lval);
2375 }
2376 return 0;
2377 }
2378
2379 /**
2380 * proc_dointvec_jiffies - read a vector of integers as seconds
2381 * @table: the sysctl table
2382 * @write: %TRUE if this is a write to the sysctl file
2383 * @buffer: the user buffer
2384 * @lenp: the size of the user buffer
2385 * @ppos: file position
2386 *
2387 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2388 * values from/to the user buffer, treated as an ASCII string.
2389 * The values read are assumed to be in seconds, and are converted into
2390 * jiffies.
2391 *
2392 * Returns 0 on success.
2393 */
2394 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2395 void __user *buffer, size_t *lenp, loff_t *ppos)
2396 {
2397 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2398 do_proc_dointvec_jiffies_conv,NULL);
2399 }
2400
2401 /**
2402 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2403 * @table: the sysctl table
2404 * @write: %TRUE if this is a write to the sysctl file
2405 * @buffer: the user buffer
2406 * @lenp: the size of the user buffer
2407 * @ppos: pointer to the file position
2408 *
2409 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2410 * values from/to the user buffer, treated as an ASCII string.
2411 * The values read are assumed to be in 1/USER_HZ seconds, and
2412 * are converted into jiffies.
2413 *
2414 * Returns 0 on success.
2415 */
2416 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2417 void __user *buffer, size_t *lenp, loff_t *ppos)
2418 {
2419 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2420 do_proc_dointvec_userhz_jiffies_conv,NULL);
2421 }
2422
2423 /**
2424 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2425 * @table: the sysctl table
2426 * @write: %TRUE if this is a write to the sysctl file
2427 * @buffer: the user buffer
2428 * @lenp: the size of the user buffer
2429 * @ppos: file position
2430 * @ppos: the current position in the file
2431 *
2432 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2433 * values from/to the user buffer, treated as an ASCII string.
2434 * The values read are assumed to be in 1/1000 seconds, and
2435 * are converted into jiffies.
2436 *
2437 * Returns 0 on success.
2438 */
2439 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2440 void __user *buffer, size_t *lenp, loff_t *ppos)
2441 {
2442 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2443 do_proc_dointvec_ms_jiffies_conv, NULL);
2444 }
2445
2446 static int proc_do_cad_pid(struct ctl_table *table, int write,
2447 void __user *buffer, size_t *lenp, loff_t *ppos)
2448 {
2449 struct pid *new_pid;
2450 pid_t tmp;
2451 int r;
2452
2453 tmp = pid_vnr(cad_pid);
2454
2455 r = __do_proc_dointvec(&tmp, table, write, buffer,
2456 lenp, ppos, NULL, NULL);
2457 if (r || !write)
2458 return r;
2459
2460 new_pid = find_get_pid(tmp);
2461 if (!new_pid)
2462 return -ESRCH;
2463
2464 put_pid(xchg(&cad_pid, new_pid));
2465 return 0;
2466 }
2467
2468 /**
2469 * proc_do_large_bitmap - read/write from/to a large bitmap
2470 * @table: the sysctl table
2471 * @write: %TRUE if this is a write to the sysctl file
2472 * @buffer: the user buffer
2473 * @lenp: the size of the user buffer
2474 * @ppos: file position
2475 *
2476 * The bitmap is stored at table->data and the bitmap length (in bits)
2477 * in table->maxlen.
2478 *
2479 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2480 * large bitmaps may be represented in a compact manner. Writing into
2481 * the file will clear the bitmap then update it with the given input.
2482 *
2483 * Returns 0 on success.
2484 */
2485 int proc_do_large_bitmap(struct ctl_table *table, int write,
2486 void __user *buffer, size_t *lenp, loff_t *ppos)
2487 {
2488 int err = 0;
2489 bool first = 1;
2490 size_t left = *lenp;
2491 unsigned long bitmap_len = table->maxlen;
2492 unsigned long *bitmap = (unsigned long *) table->data;
2493 unsigned long *tmp_bitmap = NULL;
2494 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2495
2496 if (!bitmap_len || !left || (*ppos && !write)) {
2497 *lenp = 0;
2498 return 0;
2499 }
2500
2501 if (write) {
2502 unsigned long page = 0;
2503 char *kbuf;
2504
2505 if (left > PAGE_SIZE - 1)
2506 left = PAGE_SIZE - 1;
2507
2508 page = __get_free_page(GFP_TEMPORARY);
2509 kbuf = (char *) page;
2510 if (!kbuf)
2511 return -ENOMEM;
2512 if (copy_from_user(kbuf, buffer, left)) {
2513 free_page(page);
2514 return -EFAULT;
2515 }
2516 kbuf[left] = 0;
2517
2518 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2519 GFP_KERNEL);
2520 if (!tmp_bitmap) {
2521 free_page(page);
2522 return -ENOMEM;
2523 }
2524 proc_skip_char(&kbuf, &left, '\n');
2525 while (!err && left) {
2526 unsigned long val_a, val_b;
2527 bool neg;
2528
2529 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2530 sizeof(tr_a), &c);
2531 if (err)
2532 break;
2533 if (val_a >= bitmap_len || neg) {
2534 err = -EINVAL;
2535 break;
2536 }
2537
2538 val_b = val_a;
2539 if (left) {
2540 kbuf++;
2541 left--;
2542 }
2543
2544 if (c == '-') {
2545 err = proc_get_long(&kbuf, &left, &val_b,
2546 &neg, tr_b, sizeof(tr_b),
2547 &c);
2548 if (err)
2549 break;
2550 if (val_b >= bitmap_len || neg ||
2551 val_a > val_b) {
2552 err = -EINVAL;
2553 break;
2554 }
2555 if (left) {
2556 kbuf++;
2557 left--;
2558 }
2559 }
2560
2561 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2562 first = 0;
2563 proc_skip_char(&kbuf, &left, '\n');
2564 }
2565 free_page(page);
2566 } else {
2567 unsigned long bit_a, bit_b = 0;
2568
2569 while (left) {
2570 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2571 if (bit_a >= bitmap_len)
2572 break;
2573 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2574 bit_a + 1) - 1;
2575
2576 if (!first) {
2577 err = proc_put_char(&buffer, &left, ',');
2578 if (err)
2579 break;
2580 }
2581 err = proc_put_long(&buffer, &left, bit_a, false);
2582 if (err)
2583 break;
2584 if (bit_a != bit_b) {
2585 err = proc_put_char(&buffer, &left, '-');
2586 if (err)
2587 break;
2588 err = proc_put_long(&buffer, &left, bit_b, false);
2589 if (err)
2590 break;
2591 }
2592
2593 first = 0; bit_b++;
2594 }
2595 if (!err)
2596 err = proc_put_char(&buffer, &left, '\n');
2597 }
2598
2599 if (!err) {
2600 if (write) {
2601 if (*ppos)
2602 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2603 else
2604 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2605 }
2606 kfree(tmp_bitmap);
2607 *lenp -= left;
2608 *ppos += *lenp;
2609 return 0;
2610 } else {
2611 kfree(tmp_bitmap);
2612 return err;
2613 }
2614 }
2615
2616 #else /* CONFIG_PROC_SYSCTL */
2617
2618 int proc_dostring(struct ctl_table *table, int write,
2619 void __user *buffer, size_t *lenp, loff_t *ppos)
2620 {
2621 return -ENOSYS;
2622 }
2623
2624 int proc_dointvec(struct ctl_table *table, int write,
2625 void __user *buffer, size_t *lenp, loff_t *ppos)
2626 {
2627 return -ENOSYS;
2628 }
2629
2630 int proc_dointvec_minmax(struct ctl_table *table, int write,
2631 void __user *buffer, size_t *lenp, loff_t *ppos)
2632 {
2633 return -ENOSYS;
2634 }
2635
2636 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2637 void __user *buffer, size_t *lenp, loff_t *ppos)
2638 {
2639 return -ENOSYS;
2640 }
2641
2642 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2643 void __user *buffer, size_t *lenp, loff_t *ppos)
2644 {
2645 return -ENOSYS;
2646 }
2647
2648 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2649 void __user *buffer, size_t *lenp, loff_t *ppos)
2650 {
2651 return -ENOSYS;
2652 }
2653
2654 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2655 void __user *buffer, size_t *lenp, loff_t *ppos)
2656 {
2657 return -ENOSYS;
2658 }
2659
2660 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2661 void __user *buffer,
2662 size_t *lenp, loff_t *ppos)
2663 {
2664 return -ENOSYS;
2665 }
2666
2667
2668 #endif /* CONFIG_PROC_SYSCTL */
2669
2670 /*
2671 * No sense putting this after each symbol definition, twice,
2672 * exception granted :-)
2673 */
2674 EXPORT_SYMBOL(proc_dointvec);
2675 EXPORT_SYMBOL(proc_dointvec_jiffies);
2676 EXPORT_SYMBOL(proc_dointvec_minmax);
2677 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2678 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2679 EXPORT_SYMBOL(proc_dostring);
2680 EXPORT_SYMBOL(proc_doulongvec_minmax);
2681 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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