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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph...
[mirror_ubuntu-zesty-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 #include <linux/kexec.h>
66
67 #include <asm/uaccess.h>
68 #include <asm/processor.h>
69
70 #ifdef CONFIG_X86
71 #include <asm/nmi.h>
72 #include <asm/stacktrace.h>
73 #include <asm/io.h>
74 #endif
75 #ifdef CONFIG_SPARC
76 #include <asm/setup.h>
77 #endif
78 #ifdef CONFIG_BSD_PROCESS_ACCT
79 #include <linux/acct.h>
80 #endif
81 #ifdef CONFIG_RT_MUTEXES
82 #include <linux/rtmutex.h>
83 #endif
84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85 #include <linux/lockdep.h>
86 #endif
87 #ifdef CONFIG_CHR_DEV_SG
88 #include <scsi/sg.h>
89 #endif
90
91 #ifdef CONFIG_LOCKUP_DETECTOR
92 #include <linux/nmi.h>
93 #endif
94
95
96 #if defined(CONFIG_SYSCTL)
97
98 /* External variables not in a header file. */
99 extern int max_threads;
100 extern int suid_dumpable;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid;
103 extern char core_pattern[];
104 extern unsigned int core_pipe_limit;
105 #endif
106 extern int pid_max;
107 extern int pid_max_min, pid_max_max;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
112 #ifndef CONFIG_MMU
113 extern int sysctl_nr_trim_pages;
114 #endif
115 #ifdef CONFIG_BLOCK
116 extern int blk_iopoll_enabled;
117 #endif
118
119 /* Constants used for minimum and maximum */
120 #ifdef CONFIG_LOCKUP_DETECTOR
121 static int sixty = 60;
122 #endif
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused three = 3;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 #ifdef CONFIG_PRINTK
131 static int ten_thousand = 10000;
132 #endif
133
134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136
137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138 static int maxolduid = 65535;
139 static int minolduid;
140 static int min_percpu_pagelist_fract = 8;
141
142 static int ngroups_max = NGROUPS_MAX;
143 static const int cap_last_cap = CAP_LAST_CAP;
144
145 #ifdef CONFIG_INOTIFY_USER
146 #include <linux/inotify.h>
147 #endif
148 #ifdef CONFIG_SPARC
149 #endif
150
151 #ifdef CONFIG_SPARC64
152 extern int sysctl_tsb_ratio;
153 #endif
154
155 #ifdef __hppa__
156 extern int pwrsw_enabled;
157 #endif
158
159 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
160 extern int unaligned_enabled;
161 #endif
162
163 #ifdef CONFIG_IA64
164 extern int unaligned_dump_stack;
165 #endif
166
167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
168 extern int no_unaligned_warning;
169 #endif
170
171 #ifdef CONFIG_PROC_SYSCTL
172 static int proc_do_cad_pid(struct ctl_table *table, int write,
173 void __user *buffer, size_t *lenp, loff_t *ppos);
174 static int proc_taint(struct ctl_table *table, int write,
175 void __user *buffer, size_t *lenp, loff_t *ppos);
176 #endif
177
178 #ifdef CONFIG_PRINTK
179 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
181 #endif
182
183 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
184 void __user *buffer, size_t *lenp, loff_t *ppos);
185 #ifdef CONFIG_COREDUMP
186 static int proc_dostring_coredump(struct ctl_table *table, int write,
187 void __user *buffer, size_t *lenp, loff_t *ppos);
188 #endif
189
190 #ifdef CONFIG_MAGIC_SYSRQ
191 /* Note: sysrq code uses it's own private copy */
192 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
193
194 static int sysrq_sysctl_handler(ctl_table *table, int write,
195 void __user *buffer, size_t *lenp,
196 loff_t *ppos)
197 {
198 int error;
199
200 error = proc_dointvec(table, write, buffer, lenp, ppos);
201 if (error)
202 return error;
203
204 if (write)
205 sysrq_toggle_support(__sysrq_enabled);
206
207 return 0;
208 }
209
210 #endif
211
212 static struct ctl_table kern_table[];
213 static struct ctl_table vm_table[];
214 static struct ctl_table fs_table[];
215 static struct ctl_table debug_table[];
216 static struct ctl_table dev_table[];
217 extern struct ctl_table random_table[];
218 #ifdef CONFIG_EPOLL
219 extern struct ctl_table epoll_table[];
220 #endif
221
222 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
223 int sysctl_legacy_va_layout;
224 #endif
225
226 /* The default sysctl tables: */
227
228 static struct ctl_table sysctl_base_table[] = {
229 {
230 .procname = "kernel",
231 .mode = 0555,
232 .child = kern_table,
233 },
234 {
235 .procname = "vm",
236 .mode = 0555,
237 .child = vm_table,
238 },
239 {
240 .procname = "fs",
241 .mode = 0555,
242 .child = fs_table,
243 },
244 {
245 .procname = "debug",
246 .mode = 0555,
247 .child = debug_table,
248 },
249 {
250 .procname = "dev",
251 .mode = 0555,
252 .child = dev_table,
253 },
254 { }
255 };
256
257 #ifdef CONFIG_SCHED_DEBUG
258 static int min_sched_granularity_ns = 100000; /* 100 usecs */
259 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
260 static int min_wakeup_granularity_ns; /* 0 usecs */
261 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
262 #ifdef CONFIG_SMP
263 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
264 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
265 #endif /* CONFIG_SMP */
266 #endif /* CONFIG_SCHED_DEBUG */
267
268 #ifdef CONFIG_COMPACTION
269 static int min_extfrag_threshold;
270 static int max_extfrag_threshold = 1000;
271 #endif
272
273 static struct ctl_table kern_table[] = {
274 {
275 .procname = "sched_child_runs_first",
276 .data = &sysctl_sched_child_runs_first,
277 .maxlen = sizeof(unsigned int),
278 .mode = 0644,
279 .proc_handler = proc_dointvec,
280 },
281 #ifdef CONFIG_SCHED_DEBUG
282 {
283 .procname = "sched_min_granularity_ns",
284 .data = &sysctl_sched_min_granularity,
285 .maxlen = sizeof(unsigned int),
286 .mode = 0644,
287 .proc_handler = sched_proc_update_handler,
288 .extra1 = &min_sched_granularity_ns,
289 .extra2 = &max_sched_granularity_ns,
290 },
291 {
292 .procname = "sched_latency_ns",
293 .data = &sysctl_sched_latency,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
296 .proc_handler = sched_proc_update_handler,
297 .extra1 = &min_sched_granularity_ns,
298 .extra2 = &max_sched_granularity_ns,
299 },
300 {
301 .procname = "sched_wakeup_granularity_ns",
302 .data = &sysctl_sched_wakeup_granularity,
303 .maxlen = sizeof(unsigned int),
304 .mode = 0644,
305 .proc_handler = sched_proc_update_handler,
306 .extra1 = &min_wakeup_granularity_ns,
307 .extra2 = &max_wakeup_granularity_ns,
308 },
309 #ifdef CONFIG_SMP
310 {
311 .procname = "sched_tunable_scaling",
312 .data = &sysctl_sched_tunable_scaling,
313 .maxlen = sizeof(enum sched_tunable_scaling),
314 .mode = 0644,
315 .proc_handler = sched_proc_update_handler,
316 .extra1 = &min_sched_tunable_scaling,
317 .extra2 = &max_sched_tunable_scaling,
318 },
319 {
320 .procname = "sched_migration_cost_ns",
321 .data = &sysctl_sched_migration_cost,
322 .maxlen = sizeof(unsigned int),
323 .mode = 0644,
324 .proc_handler = proc_dointvec,
325 },
326 {
327 .procname = "sched_nr_migrate",
328 .data = &sysctl_sched_nr_migrate,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec,
332 },
333 {
334 .procname = "sched_time_avg_ms",
335 .data = &sysctl_sched_time_avg,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "sched_shares_window_ns",
342 .data = &sysctl_sched_shares_window,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
347 {
348 .procname = "timer_migration",
349 .data = &sysctl_timer_migration,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec_minmax,
353 .extra1 = &zero,
354 .extra2 = &one,
355 },
356 #endif /* CONFIG_SMP */
357 #ifdef CONFIG_NUMA_BALANCING
358 {
359 .procname = "numa_balancing_scan_delay_ms",
360 .data = &sysctl_numa_balancing_scan_delay,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = proc_dointvec,
364 },
365 {
366 .procname = "numa_balancing_scan_period_min_ms",
367 .data = &sysctl_numa_balancing_scan_period_min,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
370 .proc_handler = proc_dointvec,
371 },
372 {
373 .procname = "numa_balancing_scan_period_max_ms",
374 .data = &sysctl_numa_balancing_scan_period_max,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec,
378 },
379 {
380 .procname = "numa_balancing_scan_size_mb",
381 .data = &sysctl_numa_balancing_scan_size,
382 .maxlen = sizeof(unsigned int),
383 .mode = 0644,
384 .proc_handler = proc_dointvec,
385 },
386 {
387 .procname = "numa_balancing_migrate_deferred",
388 .data = &sysctl_numa_balancing_migrate_deferred,
389 .maxlen = sizeof(unsigned int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec,
392 },
393 {
394 .procname = "numa_balancing",
395 .data = NULL, /* filled in by handler */
396 .maxlen = sizeof(unsigned int),
397 .mode = 0644,
398 .proc_handler = sysctl_numa_balancing,
399 .extra1 = &zero,
400 .extra2 = &one,
401 },
402 #endif /* CONFIG_NUMA_BALANCING */
403 #endif /* CONFIG_SCHED_DEBUG */
404 {
405 .procname = "sched_rt_period_us",
406 .data = &sysctl_sched_rt_period,
407 .maxlen = sizeof(unsigned int),
408 .mode = 0644,
409 .proc_handler = sched_rt_handler,
410 },
411 {
412 .procname = "sched_rt_runtime_us",
413 .data = &sysctl_sched_rt_runtime,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = sched_rt_handler,
417 },
418 {
419 .procname = "sched_rr_timeslice_ms",
420 .data = &sched_rr_timeslice,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = sched_rr_handler,
424 },
425 #ifdef CONFIG_SCHED_AUTOGROUP
426 {
427 .procname = "sched_autogroup_enabled",
428 .data = &sysctl_sched_autogroup_enabled,
429 .maxlen = sizeof(unsigned int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec_minmax,
432 .extra1 = &zero,
433 .extra2 = &one,
434 },
435 #endif
436 #ifdef CONFIG_CFS_BANDWIDTH
437 {
438 .procname = "sched_cfs_bandwidth_slice_us",
439 .data = &sysctl_sched_cfs_bandwidth_slice,
440 .maxlen = sizeof(unsigned int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec_minmax,
443 .extra1 = &one,
444 },
445 #endif
446 #ifdef CONFIG_PROVE_LOCKING
447 {
448 .procname = "prove_locking",
449 .data = &prove_locking,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec,
453 },
454 #endif
455 #ifdef CONFIG_LOCK_STAT
456 {
457 .procname = "lock_stat",
458 .data = &lock_stat,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec,
462 },
463 #endif
464 {
465 .procname = "panic",
466 .data = &panic_timeout,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec,
470 },
471 #ifdef CONFIG_COREDUMP
472 {
473 .procname = "core_uses_pid",
474 .data = &core_uses_pid,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec,
478 },
479 {
480 .procname = "core_pattern",
481 .data = core_pattern,
482 .maxlen = CORENAME_MAX_SIZE,
483 .mode = 0644,
484 .proc_handler = proc_dostring_coredump,
485 },
486 {
487 .procname = "core_pipe_limit",
488 .data = &core_pipe_limit,
489 .maxlen = sizeof(unsigned int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec,
492 },
493 #endif
494 #ifdef CONFIG_PROC_SYSCTL
495 {
496 .procname = "tainted",
497 .maxlen = sizeof(long),
498 .mode = 0644,
499 .proc_handler = proc_taint,
500 },
501 #endif
502 #ifdef CONFIG_LATENCYTOP
503 {
504 .procname = "latencytop",
505 .data = &latencytop_enabled,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec,
509 },
510 #endif
511 #ifdef CONFIG_BLK_DEV_INITRD
512 {
513 .procname = "real-root-dev",
514 .data = &real_root_dev,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519 #endif
520 {
521 .procname = "print-fatal-signals",
522 .data = &print_fatal_signals,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec,
526 },
527 #ifdef CONFIG_SPARC
528 {
529 .procname = "reboot-cmd",
530 .data = reboot_command,
531 .maxlen = 256,
532 .mode = 0644,
533 .proc_handler = proc_dostring,
534 },
535 {
536 .procname = "stop-a",
537 .data = &stop_a_enabled,
538 .maxlen = sizeof (int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 {
543 .procname = "scons-poweroff",
544 .data = &scons_pwroff,
545 .maxlen = sizeof (int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 #endif
550 #ifdef CONFIG_SPARC64
551 {
552 .procname = "tsb-ratio",
553 .data = &sysctl_tsb_ratio,
554 .maxlen = sizeof (int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec,
557 },
558 #endif
559 #ifdef __hppa__
560 {
561 .procname = "soft-power",
562 .data = &pwrsw_enabled,
563 .maxlen = sizeof (int),
564 .mode = 0644,
565 .proc_handler = proc_dointvec,
566 },
567 #endif
568 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
569 {
570 .procname = "unaligned-trap",
571 .data = &unaligned_enabled,
572 .maxlen = sizeof (int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec,
575 },
576 #endif
577 {
578 .procname = "ctrl-alt-del",
579 .data = &C_A_D,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = proc_dointvec,
583 },
584 #ifdef CONFIG_FUNCTION_TRACER
585 {
586 .procname = "ftrace_enabled",
587 .data = &ftrace_enabled,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = ftrace_enable_sysctl,
591 },
592 #endif
593 #ifdef CONFIG_STACK_TRACER
594 {
595 .procname = "stack_tracer_enabled",
596 .data = &stack_tracer_enabled,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = stack_trace_sysctl,
600 },
601 #endif
602 #ifdef CONFIG_TRACING
603 {
604 .procname = "ftrace_dump_on_oops",
605 .data = &ftrace_dump_on_oops,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = proc_dointvec,
609 },
610 {
611 .procname = "traceoff_on_warning",
612 .data = &__disable_trace_on_warning,
613 .maxlen = sizeof(__disable_trace_on_warning),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
617 #endif
618 #ifdef CONFIG_KEXEC
619 {
620 .procname = "kexec_load_disabled",
621 .data = &kexec_load_disabled,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 /* only handle a transition from default "0" to "1" */
625 .proc_handler = proc_dointvec_minmax,
626 .extra1 = &one,
627 .extra2 = &one,
628 },
629 #endif
630 #ifdef CONFIG_MODULES
631 {
632 .procname = "modprobe",
633 .data = &modprobe_path,
634 .maxlen = KMOD_PATH_LEN,
635 .mode = 0644,
636 .proc_handler = proc_dostring,
637 },
638 {
639 .procname = "modules_disabled",
640 .data = &modules_disabled,
641 .maxlen = sizeof(int),
642 .mode = 0644,
643 /* only handle a transition from default "0" to "1" */
644 .proc_handler = proc_dointvec_minmax,
645 .extra1 = &one,
646 .extra2 = &one,
647 },
648 #endif
649
650 {
651 .procname = "hotplug",
652 .data = &uevent_helper,
653 .maxlen = UEVENT_HELPER_PATH_LEN,
654 .mode = 0644,
655 .proc_handler = proc_dostring,
656 },
657
658 #ifdef CONFIG_CHR_DEV_SG
659 {
660 .procname = "sg-big-buff",
661 .data = &sg_big_buff,
662 .maxlen = sizeof (int),
663 .mode = 0444,
664 .proc_handler = proc_dointvec,
665 },
666 #endif
667 #ifdef CONFIG_BSD_PROCESS_ACCT
668 {
669 .procname = "acct",
670 .data = &acct_parm,
671 .maxlen = 3*sizeof(int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec,
674 },
675 #endif
676 #ifdef CONFIG_MAGIC_SYSRQ
677 {
678 .procname = "sysrq",
679 .data = &__sysrq_enabled,
680 .maxlen = sizeof (int),
681 .mode = 0644,
682 .proc_handler = sysrq_sysctl_handler,
683 },
684 #endif
685 #ifdef CONFIG_PROC_SYSCTL
686 {
687 .procname = "cad_pid",
688 .data = NULL,
689 .maxlen = sizeof (int),
690 .mode = 0600,
691 .proc_handler = proc_do_cad_pid,
692 },
693 #endif
694 {
695 .procname = "threads-max",
696 .data = &max_threads,
697 .maxlen = sizeof(int),
698 .mode = 0644,
699 .proc_handler = proc_dointvec,
700 },
701 {
702 .procname = "random",
703 .mode = 0555,
704 .child = random_table,
705 },
706 {
707 .procname = "usermodehelper",
708 .mode = 0555,
709 .child = usermodehelper_table,
710 },
711 {
712 .procname = "overflowuid",
713 .data = &overflowuid,
714 .maxlen = sizeof(int),
715 .mode = 0644,
716 .proc_handler = proc_dointvec_minmax,
717 .extra1 = &minolduid,
718 .extra2 = &maxolduid,
719 },
720 {
721 .procname = "overflowgid",
722 .data = &overflowgid,
723 .maxlen = sizeof(int),
724 .mode = 0644,
725 .proc_handler = proc_dointvec_minmax,
726 .extra1 = &minolduid,
727 .extra2 = &maxolduid,
728 },
729 #ifdef CONFIG_S390
730 #ifdef CONFIG_MATHEMU
731 {
732 .procname = "ieee_emulation_warnings",
733 .data = &sysctl_ieee_emulation_warnings,
734 .maxlen = sizeof(int),
735 .mode = 0644,
736 .proc_handler = proc_dointvec,
737 },
738 #endif
739 {
740 .procname = "userprocess_debug",
741 .data = &show_unhandled_signals,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = proc_dointvec,
745 },
746 #endif
747 {
748 .procname = "pid_max",
749 .data = &pid_max,
750 .maxlen = sizeof (int),
751 .mode = 0644,
752 .proc_handler = proc_dointvec_minmax,
753 .extra1 = &pid_max_min,
754 .extra2 = &pid_max_max,
755 },
756 {
757 .procname = "panic_on_oops",
758 .data = &panic_on_oops,
759 .maxlen = sizeof(int),
760 .mode = 0644,
761 .proc_handler = proc_dointvec,
762 },
763 #if defined CONFIG_PRINTK
764 {
765 .procname = "printk",
766 .data = &console_loglevel,
767 .maxlen = 4*sizeof(int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec,
770 },
771 {
772 .procname = "printk_ratelimit",
773 .data = &printk_ratelimit_state.interval,
774 .maxlen = sizeof(int),
775 .mode = 0644,
776 .proc_handler = proc_dointvec_jiffies,
777 },
778 {
779 .procname = "printk_ratelimit_burst",
780 .data = &printk_ratelimit_state.burst,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec,
784 },
785 {
786 .procname = "printk_delay",
787 .data = &printk_delay_msec,
788 .maxlen = sizeof(int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec_minmax,
791 .extra1 = &zero,
792 .extra2 = &ten_thousand,
793 },
794 {
795 .procname = "dmesg_restrict",
796 .data = &dmesg_restrict,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec_minmax_sysadmin,
800 .extra1 = &zero,
801 .extra2 = &one,
802 },
803 {
804 .procname = "kptr_restrict",
805 .data = &kptr_restrict,
806 .maxlen = sizeof(int),
807 .mode = 0644,
808 .proc_handler = proc_dointvec_minmax_sysadmin,
809 .extra1 = &zero,
810 .extra2 = &two,
811 },
812 #endif
813 {
814 .procname = "ngroups_max",
815 .data = &ngroups_max,
816 .maxlen = sizeof (int),
817 .mode = 0444,
818 .proc_handler = proc_dointvec,
819 },
820 {
821 .procname = "cap_last_cap",
822 .data = (void *)&cap_last_cap,
823 .maxlen = sizeof(int),
824 .mode = 0444,
825 .proc_handler = proc_dointvec,
826 },
827 #if defined(CONFIG_LOCKUP_DETECTOR)
828 {
829 .procname = "watchdog",
830 .data = &watchdog_user_enabled,
831 .maxlen = sizeof (int),
832 .mode = 0644,
833 .proc_handler = proc_dowatchdog,
834 .extra1 = &zero,
835 .extra2 = &one,
836 },
837 {
838 .procname = "watchdog_thresh",
839 .data = &watchdog_thresh,
840 .maxlen = sizeof(int),
841 .mode = 0644,
842 .proc_handler = proc_dowatchdog,
843 .extra1 = &zero,
844 .extra2 = &sixty,
845 },
846 {
847 .procname = "softlockup_panic",
848 .data = &softlockup_panic,
849 .maxlen = sizeof(int),
850 .mode = 0644,
851 .proc_handler = proc_dointvec_minmax,
852 .extra1 = &zero,
853 .extra2 = &one,
854 },
855 {
856 .procname = "nmi_watchdog",
857 .data = &watchdog_user_enabled,
858 .maxlen = sizeof (int),
859 .mode = 0644,
860 .proc_handler = proc_dowatchdog,
861 .extra1 = &zero,
862 .extra2 = &one,
863 },
864 #endif
865 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
866 {
867 .procname = "unknown_nmi_panic",
868 .data = &unknown_nmi_panic,
869 .maxlen = sizeof (int),
870 .mode = 0644,
871 .proc_handler = proc_dointvec,
872 },
873 #endif
874 #if defined(CONFIG_X86)
875 {
876 .procname = "panic_on_unrecovered_nmi",
877 .data = &panic_on_unrecovered_nmi,
878 .maxlen = sizeof(int),
879 .mode = 0644,
880 .proc_handler = proc_dointvec,
881 },
882 {
883 .procname = "panic_on_io_nmi",
884 .data = &panic_on_io_nmi,
885 .maxlen = sizeof(int),
886 .mode = 0644,
887 .proc_handler = proc_dointvec,
888 },
889 #ifdef CONFIG_DEBUG_STACKOVERFLOW
890 {
891 .procname = "panic_on_stackoverflow",
892 .data = &sysctl_panic_on_stackoverflow,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_dointvec,
896 },
897 #endif
898 {
899 .procname = "bootloader_type",
900 .data = &bootloader_type,
901 .maxlen = sizeof (int),
902 .mode = 0444,
903 .proc_handler = proc_dointvec,
904 },
905 {
906 .procname = "bootloader_version",
907 .data = &bootloader_version,
908 .maxlen = sizeof (int),
909 .mode = 0444,
910 .proc_handler = proc_dointvec,
911 },
912 {
913 .procname = "kstack_depth_to_print",
914 .data = &kstack_depth_to_print,
915 .maxlen = sizeof(int),
916 .mode = 0644,
917 .proc_handler = proc_dointvec,
918 },
919 {
920 .procname = "io_delay_type",
921 .data = &io_delay_type,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec,
925 },
926 #endif
927 #if defined(CONFIG_MMU)
928 {
929 .procname = "randomize_va_space",
930 .data = &randomize_va_space,
931 .maxlen = sizeof(int),
932 .mode = 0644,
933 .proc_handler = proc_dointvec,
934 },
935 #endif
936 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
937 {
938 .procname = "spin_retry",
939 .data = &spin_retry,
940 .maxlen = sizeof (int),
941 .mode = 0644,
942 .proc_handler = proc_dointvec,
943 },
944 #endif
945 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
946 {
947 .procname = "acpi_video_flags",
948 .data = &acpi_realmode_flags,
949 .maxlen = sizeof (unsigned long),
950 .mode = 0644,
951 .proc_handler = proc_doulongvec_minmax,
952 },
953 #endif
954 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
955 {
956 .procname = "ignore-unaligned-usertrap",
957 .data = &no_unaligned_warning,
958 .maxlen = sizeof (int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec,
961 },
962 #endif
963 #ifdef CONFIG_IA64
964 {
965 .procname = "unaligned-dump-stack",
966 .data = &unaligned_dump_stack,
967 .maxlen = sizeof (int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec,
970 },
971 #endif
972 #ifdef CONFIG_DETECT_HUNG_TASK
973 {
974 .procname = "hung_task_panic",
975 .data = &sysctl_hung_task_panic,
976 .maxlen = sizeof(int),
977 .mode = 0644,
978 .proc_handler = proc_dointvec_minmax,
979 .extra1 = &zero,
980 .extra2 = &one,
981 },
982 {
983 .procname = "hung_task_check_count",
984 .data = &sysctl_hung_task_check_count,
985 .maxlen = sizeof(int),
986 .mode = 0644,
987 .proc_handler = proc_dointvec_minmax,
988 .extra1 = &zero,
989 },
990 {
991 .procname = "hung_task_timeout_secs",
992 .data = &sysctl_hung_task_timeout_secs,
993 .maxlen = sizeof(unsigned long),
994 .mode = 0644,
995 .proc_handler = proc_dohung_task_timeout_secs,
996 },
997 {
998 .procname = "hung_task_warnings",
999 .data = &sysctl_hung_task_warnings,
1000 .maxlen = sizeof(unsigned long),
1001 .mode = 0644,
1002 .proc_handler = proc_doulongvec_minmax,
1003 },
1004 #endif
1005 #ifdef CONFIG_COMPAT
1006 {
1007 .procname = "compat-log",
1008 .data = &compat_log,
1009 .maxlen = sizeof (int),
1010 .mode = 0644,
1011 .proc_handler = proc_dointvec,
1012 },
1013 #endif
1014 #ifdef CONFIG_RT_MUTEXES
1015 {
1016 .procname = "max_lock_depth",
1017 .data = &max_lock_depth,
1018 .maxlen = sizeof(int),
1019 .mode = 0644,
1020 .proc_handler = proc_dointvec,
1021 },
1022 #endif
1023 {
1024 .procname = "poweroff_cmd",
1025 .data = &poweroff_cmd,
1026 .maxlen = POWEROFF_CMD_PATH_LEN,
1027 .mode = 0644,
1028 .proc_handler = proc_dostring,
1029 },
1030 #ifdef CONFIG_KEYS
1031 {
1032 .procname = "keys",
1033 .mode = 0555,
1034 .child = key_sysctls,
1035 },
1036 #endif
1037 #ifdef CONFIG_RCU_TORTURE_TEST
1038 {
1039 .procname = "rcutorture_runnable",
1040 .data = &rcutorture_runnable,
1041 .maxlen = sizeof(int),
1042 .mode = 0644,
1043 .proc_handler = proc_dointvec,
1044 },
1045 #endif
1046 #ifdef CONFIG_PERF_EVENTS
1047 /*
1048 * User-space scripts rely on the existence of this file
1049 * as a feature check for perf_events being enabled.
1050 *
1051 * So it's an ABI, do not remove!
1052 */
1053 {
1054 .procname = "perf_event_paranoid",
1055 .data = &sysctl_perf_event_paranoid,
1056 .maxlen = sizeof(sysctl_perf_event_paranoid),
1057 .mode = 0644,
1058 .proc_handler = proc_dointvec,
1059 },
1060 {
1061 .procname = "perf_event_mlock_kb",
1062 .data = &sysctl_perf_event_mlock,
1063 .maxlen = sizeof(sysctl_perf_event_mlock),
1064 .mode = 0644,
1065 .proc_handler = proc_dointvec,
1066 },
1067 {
1068 .procname = "perf_event_max_sample_rate",
1069 .data = &sysctl_perf_event_sample_rate,
1070 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1071 .mode = 0644,
1072 .proc_handler = perf_proc_update_handler,
1073 .extra1 = &one,
1074 },
1075 {
1076 .procname = "perf_cpu_time_max_percent",
1077 .data = &sysctl_perf_cpu_time_max_percent,
1078 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1079 .mode = 0644,
1080 .proc_handler = perf_cpu_time_max_percent_handler,
1081 .extra1 = &zero,
1082 .extra2 = &one_hundred,
1083 },
1084 #endif
1085 #ifdef CONFIG_KMEMCHECK
1086 {
1087 .procname = "kmemcheck",
1088 .data = &kmemcheck_enabled,
1089 .maxlen = sizeof(int),
1090 .mode = 0644,
1091 .proc_handler = proc_dointvec,
1092 },
1093 #endif
1094 #ifdef CONFIG_BLOCK
1095 {
1096 .procname = "blk_iopoll",
1097 .data = &blk_iopoll_enabled,
1098 .maxlen = sizeof(int),
1099 .mode = 0644,
1100 .proc_handler = proc_dointvec,
1101 },
1102 #endif
1103 { }
1104 };
1105
1106 static struct ctl_table vm_table[] = {
1107 {
1108 .procname = "overcommit_memory",
1109 .data = &sysctl_overcommit_memory,
1110 .maxlen = sizeof(sysctl_overcommit_memory),
1111 .mode = 0644,
1112 .proc_handler = proc_dointvec_minmax,
1113 .extra1 = &zero,
1114 .extra2 = &two,
1115 },
1116 {
1117 .procname = "panic_on_oom",
1118 .data = &sysctl_panic_on_oom,
1119 .maxlen = sizeof(sysctl_panic_on_oom),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec_minmax,
1122 .extra1 = &zero,
1123 .extra2 = &two,
1124 },
1125 {
1126 .procname = "oom_kill_allocating_task",
1127 .data = &sysctl_oom_kill_allocating_task,
1128 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1129 .mode = 0644,
1130 .proc_handler = proc_dointvec,
1131 },
1132 {
1133 .procname = "oom_dump_tasks",
1134 .data = &sysctl_oom_dump_tasks,
1135 .maxlen = sizeof(sysctl_oom_dump_tasks),
1136 .mode = 0644,
1137 .proc_handler = proc_dointvec,
1138 },
1139 {
1140 .procname = "overcommit_ratio",
1141 .data = &sysctl_overcommit_ratio,
1142 .maxlen = sizeof(sysctl_overcommit_ratio),
1143 .mode = 0644,
1144 .proc_handler = overcommit_ratio_handler,
1145 },
1146 {
1147 .procname = "overcommit_kbytes",
1148 .data = &sysctl_overcommit_kbytes,
1149 .maxlen = sizeof(sysctl_overcommit_kbytes),
1150 .mode = 0644,
1151 .proc_handler = overcommit_kbytes_handler,
1152 },
1153 {
1154 .procname = "page-cluster",
1155 .data = &page_cluster,
1156 .maxlen = sizeof(int),
1157 .mode = 0644,
1158 .proc_handler = proc_dointvec_minmax,
1159 .extra1 = &zero,
1160 },
1161 {
1162 .procname = "dirty_background_ratio",
1163 .data = &dirty_background_ratio,
1164 .maxlen = sizeof(dirty_background_ratio),
1165 .mode = 0644,
1166 .proc_handler = dirty_background_ratio_handler,
1167 .extra1 = &zero,
1168 .extra2 = &one_hundred,
1169 },
1170 {
1171 .procname = "dirty_background_bytes",
1172 .data = &dirty_background_bytes,
1173 .maxlen = sizeof(dirty_background_bytes),
1174 .mode = 0644,
1175 .proc_handler = dirty_background_bytes_handler,
1176 .extra1 = &one_ul,
1177 },
1178 {
1179 .procname = "dirty_ratio",
1180 .data = &vm_dirty_ratio,
1181 .maxlen = sizeof(vm_dirty_ratio),
1182 .mode = 0644,
1183 .proc_handler = dirty_ratio_handler,
1184 .extra1 = &zero,
1185 .extra2 = &one_hundred,
1186 },
1187 {
1188 .procname = "dirty_bytes",
1189 .data = &vm_dirty_bytes,
1190 .maxlen = sizeof(vm_dirty_bytes),
1191 .mode = 0644,
1192 .proc_handler = dirty_bytes_handler,
1193 .extra1 = &dirty_bytes_min,
1194 },
1195 {
1196 .procname = "dirty_writeback_centisecs",
1197 .data = &dirty_writeback_interval,
1198 .maxlen = sizeof(dirty_writeback_interval),
1199 .mode = 0644,
1200 .proc_handler = dirty_writeback_centisecs_handler,
1201 },
1202 {
1203 .procname = "dirty_expire_centisecs",
1204 .data = &dirty_expire_interval,
1205 .maxlen = sizeof(dirty_expire_interval),
1206 .mode = 0644,
1207 .proc_handler = proc_dointvec_minmax,
1208 .extra1 = &zero,
1209 },
1210 {
1211 .procname = "nr_pdflush_threads",
1212 .mode = 0444 /* read-only */,
1213 .proc_handler = pdflush_proc_obsolete,
1214 },
1215 {
1216 .procname = "swappiness",
1217 .data = &vm_swappiness,
1218 .maxlen = sizeof(vm_swappiness),
1219 .mode = 0644,
1220 .proc_handler = proc_dointvec_minmax,
1221 .extra1 = &zero,
1222 .extra2 = &one_hundred,
1223 },
1224 #ifdef CONFIG_HUGETLB_PAGE
1225 {
1226 .procname = "nr_hugepages",
1227 .data = NULL,
1228 .maxlen = sizeof(unsigned long),
1229 .mode = 0644,
1230 .proc_handler = hugetlb_sysctl_handler,
1231 .extra1 = (void *)&hugetlb_zero,
1232 .extra2 = (void *)&hugetlb_infinity,
1233 },
1234 #ifdef CONFIG_NUMA
1235 {
1236 .procname = "nr_hugepages_mempolicy",
1237 .data = NULL,
1238 .maxlen = sizeof(unsigned long),
1239 .mode = 0644,
1240 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1241 .extra1 = (void *)&hugetlb_zero,
1242 .extra2 = (void *)&hugetlb_infinity,
1243 },
1244 #endif
1245 {
1246 .procname = "hugetlb_shm_group",
1247 .data = &sysctl_hugetlb_shm_group,
1248 .maxlen = sizeof(gid_t),
1249 .mode = 0644,
1250 .proc_handler = proc_dointvec,
1251 },
1252 {
1253 .procname = "hugepages_treat_as_movable",
1254 .data = &hugepages_treat_as_movable,
1255 .maxlen = sizeof(int),
1256 .mode = 0644,
1257 .proc_handler = proc_dointvec,
1258 },
1259 {
1260 .procname = "nr_overcommit_hugepages",
1261 .data = NULL,
1262 .maxlen = sizeof(unsigned long),
1263 .mode = 0644,
1264 .proc_handler = hugetlb_overcommit_handler,
1265 .extra1 = (void *)&hugetlb_zero,
1266 .extra2 = (void *)&hugetlb_infinity,
1267 },
1268 #endif
1269 {
1270 .procname = "lowmem_reserve_ratio",
1271 .data = &sysctl_lowmem_reserve_ratio,
1272 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1273 .mode = 0644,
1274 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1275 },
1276 {
1277 .procname = "drop_caches",
1278 .data = &sysctl_drop_caches,
1279 .maxlen = sizeof(int),
1280 .mode = 0644,
1281 .proc_handler = drop_caches_sysctl_handler,
1282 .extra1 = &one,
1283 .extra2 = &three,
1284 },
1285 #ifdef CONFIG_COMPACTION
1286 {
1287 .procname = "compact_memory",
1288 .data = &sysctl_compact_memory,
1289 .maxlen = sizeof(int),
1290 .mode = 0200,
1291 .proc_handler = sysctl_compaction_handler,
1292 },
1293 {
1294 .procname = "extfrag_threshold",
1295 .data = &sysctl_extfrag_threshold,
1296 .maxlen = sizeof(int),
1297 .mode = 0644,
1298 .proc_handler = sysctl_extfrag_handler,
1299 .extra1 = &min_extfrag_threshold,
1300 .extra2 = &max_extfrag_threshold,
1301 },
1302
1303 #endif /* CONFIG_COMPACTION */
1304 {
1305 .procname = "min_free_kbytes",
1306 .data = &min_free_kbytes,
1307 .maxlen = sizeof(min_free_kbytes),
1308 .mode = 0644,
1309 .proc_handler = min_free_kbytes_sysctl_handler,
1310 .extra1 = &zero,
1311 },
1312 {
1313 .procname = "percpu_pagelist_fraction",
1314 .data = &percpu_pagelist_fraction,
1315 .maxlen = sizeof(percpu_pagelist_fraction),
1316 .mode = 0644,
1317 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1318 .extra1 = &min_percpu_pagelist_fract,
1319 },
1320 #ifdef CONFIG_MMU
1321 {
1322 .procname = "max_map_count",
1323 .data = &sysctl_max_map_count,
1324 .maxlen = sizeof(sysctl_max_map_count),
1325 .mode = 0644,
1326 .proc_handler = proc_dointvec_minmax,
1327 .extra1 = &zero,
1328 },
1329 #else
1330 {
1331 .procname = "nr_trim_pages",
1332 .data = &sysctl_nr_trim_pages,
1333 .maxlen = sizeof(sysctl_nr_trim_pages),
1334 .mode = 0644,
1335 .proc_handler = proc_dointvec_minmax,
1336 .extra1 = &zero,
1337 },
1338 #endif
1339 {
1340 .procname = "laptop_mode",
1341 .data = &laptop_mode,
1342 .maxlen = sizeof(laptop_mode),
1343 .mode = 0644,
1344 .proc_handler = proc_dointvec_jiffies,
1345 },
1346 {
1347 .procname = "block_dump",
1348 .data = &block_dump,
1349 .maxlen = sizeof(block_dump),
1350 .mode = 0644,
1351 .proc_handler = proc_dointvec,
1352 .extra1 = &zero,
1353 },
1354 {
1355 .procname = "vfs_cache_pressure",
1356 .data = &sysctl_vfs_cache_pressure,
1357 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1358 .mode = 0644,
1359 .proc_handler = proc_dointvec,
1360 .extra1 = &zero,
1361 },
1362 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1363 {
1364 .procname = "legacy_va_layout",
1365 .data = &sysctl_legacy_va_layout,
1366 .maxlen = sizeof(sysctl_legacy_va_layout),
1367 .mode = 0644,
1368 .proc_handler = proc_dointvec,
1369 .extra1 = &zero,
1370 },
1371 #endif
1372 #ifdef CONFIG_NUMA
1373 {
1374 .procname = "zone_reclaim_mode",
1375 .data = &zone_reclaim_mode,
1376 .maxlen = sizeof(zone_reclaim_mode),
1377 .mode = 0644,
1378 .proc_handler = proc_dointvec,
1379 .extra1 = &zero,
1380 },
1381 {
1382 .procname = "min_unmapped_ratio",
1383 .data = &sysctl_min_unmapped_ratio,
1384 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1385 .mode = 0644,
1386 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1387 .extra1 = &zero,
1388 .extra2 = &one_hundred,
1389 },
1390 {
1391 .procname = "min_slab_ratio",
1392 .data = &sysctl_min_slab_ratio,
1393 .maxlen = sizeof(sysctl_min_slab_ratio),
1394 .mode = 0644,
1395 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1396 .extra1 = &zero,
1397 .extra2 = &one_hundred,
1398 },
1399 #endif
1400 #ifdef CONFIG_SMP
1401 {
1402 .procname = "stat_interval",
1403 .data = &sysctl_stat_interval,
1404 .maxlen = sizeof(sysctl_stat_interval),
1405 .mode = 0644,
1406 .proc_handler = proc_dointvec_jiffies,
1407 },
1408 #endif
1409 #ifdef CONFIG_MMU
1410 {
1411 .procname = "mmap_min_addr",
1412 .data = &dac_mmap_min_addr,
1413 .maxlen = sizeof(unsigned long),
1414 .mode = 0644,
1415 .proc_handler = mmap_min_addr_handler,
1416 },
1417 #endif
1418 #ifdef CONFIG_NUMA
1419 {
1420 .procname = "numa_zonelist_order",
1421 .data = &numa_zonelist_order,
1422 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1423 .mode = 0644,
1424 .proc_handler = numa_zonelist_order_handler,
1425 },
1426 #endif
1427 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1428 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1429 {
1430 .procname = "vdso_enabled",
1431 .data = &vdso_enabled,
1432 .maxlen = sizeof(vdso_enabled),
1433 .mode = 0644,
1434 .proc_handler = proc_dointvec,
1435 .extra1 = &zero,
1436 },
1437 #endif
1438 #ifdef CONFIG_HIGHMEM
1439 {
1440 .procname = "highmem_is_dirtyable",
1441 .data = &vm_highmem_is_dirtyable,
1442 .maxlen = sizeof(vm_highmem_is_dirtyable),
1443 .mode = 0644,
1444 .proc_handler = proc_dointvec_minmax,
1445 .extra1 = &zero,
1446 .extra2 = &one,
1447 },
1448 #endif
1449 {
1450 .procname = "scan_unevictable_pages",
1451 .data = &scan_unevictable_pages,
1452 .maxlen = sizeof(scan_unevictable_pages),
1453 .mode = 0644,
1454 .proc_handler = scan_unevictable_handler,
1455 },
1456 #ifdef CONFIG_MEMORY_FAILURE
1457 {
1458 .procname = "memory_failure_early_kill",
1459 .data = &sysctl_memory_failure_early_kill,
1460 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec_minmax,
1463 .extra1 = &zero,
1464 .extra2 = &one,
1465 },
1466 {
1467 .procname = "memory_failure_recovery",
1468 .data = &sysctl_memory_failure_recovery,
1469 .maxlen = sizeof(sysctl_memory_failure_recovery),
1470 .mode = 0644,
1471 .proc_handler = proc_dointvec_minmax,
1472 .extra1 = &zero,
1473 .extra2 = &one,
1474 },
1475 #endif
1476 {
1477 .procname = "user_reserve_kbytes",
1478 .data = &sysctl_user_reserve_kbytes,
1479 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1480 .mode = 0644,
1481 .proc_handler = proc_doulongvec_minmax,
1482 },
1483 {
1484 .procname = "admin_reserve_kbytes",
1485 .data = &sysctl_admin_reserve_kbytes,
1486 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1487 .mode = 0644,
1488 .proc_handler = proc_doulongvec_minmax,
1489 },
1490 { }
1491 };
1492
1493 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1494 static struct ctl_table binfmt_misc_table[] = {
1495 { }
1496 };
1497 #endif
1498
1499 static struct ctl_table fs_table[] = {
1500 {
1501 .procname = "inode-nr",
1502 .data = &inodes_stat,
1503 .maxlen = 2*sizeof(long),
1504 .mode = 0444,
1505 .proc_handler = proc_nr_inodes,
1506 },
1507 {
1508 .procname = "inode-state",
1509 .data = &inodes_stat,
1510 .maxlen = 7*sizeof(long),
1511 .mode = 0444,
1512 .proc_handler = proc_nr_inodes,
1513 },
1514 {
1515 .procname = "file-nr",
1516 .data = &files_stat,
1517 .maxlen = sizeof(files_stat),
1518 .mode = 0444,
1519 .proc_handler = proc_nr_files,
1520 },
1521 {
1522 .procname = "file-max",
1523 .data = &files_stat.max_files,
1524 .maxlen = sizeof(files_stat.max_files),
1525 .mode = 0644,
1526 .proc_handler = proc_doulongvec_minmax,
1527 },
1528 {
1529 .procname = "nr_open",
1530 .data = &sysctl_nr_open,
1531 .maxlen = sizeof(int),
1532 .mode = 0644,
1533 .proc_handler = proc_dointvec_minmax,
1534 .extra1 = &sysctl_nr_open_min,
1535 .extra2 = &sysctl_nr_open_max,
1536 },
1537 {
1538 .procname = "dentry-state",
1539 .data = &dentry_stat,
1540 .maxlen = 6*sizeof(long),
1541 .mode = 0444,
1542 .proc_handler = proc_nr_dentry,
1543 },
1544 {
1545 .procname = "overflowuid",
1546 .data = &fs_overflowuid,
1547 .maxlen = sizeof(int),
1548 .mode = 0644,
1549 .proc_handler = proc_dointvec_minmax,
1550 .extra1 = &minolduid,
1551 .extra2 = &maxolduid,
1552 },
1553 {
1554 .procname = "overflowgid",
1555 .data = &fs_overflowgid,
1556 .maxlen = sizeof(int),
1557 .mode = 0644,
1558 .proc_handler = proc_dointvec_minmax,
1559 .extra1 = &minolduid,
1560 .extra2 = &maxolduid,
1561 },
1562 #ifdef CONFIG_FILE_LOCKING
1563 {
1564 .procname = "leases-enable",
1565 .data = &leases_enable,
1566 .maxlen = sizeof(int),
1567 .mode = 0644,
1568 .proc_handler = proc_dointvec,
1569 },
1570 #endif
1571 #ifdef CONFIG_DNOTIFY
1572 {
1573 .procname = "dir-notify-enable",
1574 .data = &dir_notify_enable,
1575 .maxlen = sizeof(int),
1576 .mode = 0644,
1577 .proc_handler = proc_dointvec,
1578 },
1579 #endif
1580 #ifdef CONFIG_MMU
1581 #ifdef CONFIG_FILE_LOCKING
1582 {
1583 .procname = "lease-break-time",
1584 .data = &lease_break_time,
1585 .maxlen = sizeof(int),
1586 .mode = 0644,
1587 .proc_handler = proc_dointvec,
1588 },
1589 #endif
1590 #ifdef CONFIG_AIO
1591 {
1592 .procname = "aio-nr",
1593 .data = &aio_nr,
1594 .maxlen = sizeof(aio_nr),
1595 .mode = 0444,
1596 .proc_handler = proc_doulongvec_minmax,
1597 },
1598 {
1599 .procname = "aio-max-nr",
1600 .data = &aio_max_nr,
1601 .maxlen = sizeof(aio_max_nr),
1602 .mode = 0644,
1603 .proc_handler = proc_doulongvec_minmax,
1604 },
1605 #endif /* CONFIG_AIO */
1606 #ifdef CONFIG_INOTIFY_USER
1607 {
1608 .procname = "inotify",
1609 .mode = 0555,
1610 .child = inotify_table,
1611 },
1612 #endif
1613 #ifdef CONFIG_EPOLL
1614 {
1615 .procname = "epoll",
1616 .mode = 0555,
1617 .child = epoll_table,
1618 },
1619 #endif
1620 #endif
1621 {
1622 .procname = "protected_symlinks",
1623 .data = &sysctl_protected_symlinks,
1624 .maxlen = sizeof(int),
1625 .mode = 0600,
1626 .proc_handler = proc_dointvec_minmax,
1627 .extra1 = &zero,
1628 .extra2 = &one,
1629 },
1630 {
1631 .procname = "protected_hardlinks",
1632 .data = &sysctl_protected_hardlinks,
1633 .maxlen = sizeof(int),
1634 .mode = 0600,
1635 .proc_handler = proc_dointvec_minmax,
1636 .extra1 = &zero,
1637 .extra2 = &one,
1638 },
1639 {
1640 .procname = "suid_dumpable",
1641 .data = &suid_dumpable,
1642 .maxlen = sizeof(int),
1643 .mode = 0644,
1644 .proc_handler = proc_dointvec_minmax_coredump,
1645 .extra1 = &zero,
1646 .extra2 = &two,
1647 },
1648 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1649 {
1650 .procname = "binfmt_misc",
1651 .mode = 0555,
1652 .child = binfmt_misc_table,
1653 },
1654 #endif
1655 {
1656 .procname = "pipe-max-size",
1657 .data = &pipe_max_size,
1658 .maxlen = sizeof(int),
1659 .mode = 0644,
1660 .proc_handler = &pipe_proc_fn,
1661 .extra1 = &pipe_min_size,
1662 },
1663 { }
1664 };
1665
1666 static struct ctl_table debug_table[] = {
1667 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1668 {
1669 .procname = "exception-trace",
1670 .data = &show_unhandled_signals,
1671 .maxlen = sizeof(int),
1672 .mode = 0644,
1673 .proc_handler = proc_dointvec
1674 },
1675 #endif
1676 #if defined(CONFIG_OPTPROBES)
1677 {
1678 .procname = "kprobes-optimization",
1679 .data = &sysctl_kprobes_optimization,
1680 .maxlen = sizeof(int),
1681 .mode = 0644,
1682 .proc_handler = proc_kprobes_optimization_handler,
1683 .extra1 = &zero,
1684 .extra2 = &one,
1685 },
1686 #endif
1687 { }
1688 };
1689
1690 static struct ctl_table dev_table[] = {
1691 { }
1692 };
1693
1694 int __init sysctl_init(void)
1695 {
1696 struct ctl_table_header *hdr;
1697
1698 hdr = register_sysctl_table(sysctl_base_table);
1699 kmemleak_not_leak(hdr);
1700 return 0;
1701 }
1702
1703 #endif /* CONFIG_SYSCTL */
1704
1705 /*
1706 * /proc/sys support
1707 */
1708
1709 #ifdef CONFIG_PROC_SYSCTL
1710
1711 static int _proc_do_string(void* data, int maxlen, int write,
1712 void __user *buffer,
1713 size_t *lenp, loff_t *ppos)
1714 {
1715 size_t len;
1716 char __user *p;
1717 char c;
1718
1719 if (!data || !maxlen || !*lenp) {
1720 *lenp = 0;
1721 return 0;
1722 }
1723
1724 if (write) {
1725 len = 0;
1726 p = buffer;
1727 while (len < *lenp) {
1728 if (get_user(c, p++))
1729 return -EFAULT;
1730 if (c == 0 || c == '\n')
1731 break;
1732 len++;
1733 }
1734 if (len >= maxlen)
1735 len = maxlen-1;
1736 if(copy_from_user(data, buffer, len))
1737 return -EFAULT;
1738 ((char *) data)[len] = 0;
1739 *ppos += *lenp;
1740 } else {
1741 len = strlen(data);
1742 if (len > maxlen)
1743 len = maxlen;
1744
1745 if (*ppos > len) {
1746 *lenp = 0;
1747 return 0;
1748 }
1749
1750 data += *ppos;
1751 len -= *ppos;
1752
1753 if (len > *lenp)
1754 len = *lenp;
1755 if (len)
1756 if(copy_to_user(buffer, data, len))
1757 return -EFAULT;
1758 if (len < *lenp) {
1759 if(put_user('\n', ((char __user *) buffer) + len))
1760 return -EFAULT;
1761 len++;
1762 }
1763 *lenp = len;
1764 *ppos += len;
1765 }
1766 return 0;
1767 }
1768
1769 /**
1770 * proc_dostring - read a string sysctl
1771 * @table: the sysctl table
1772 * @write: %TRUE if this is a write to the sysctl file
1773 * @buffer: the user buffer
1774 * @lenp: the size of the user buffer
1775 * @ppos: file position
1776 *
1777 * Reads/writes a string from/to the user buffer. If the kernel
1778 * buffer provided is not large enough to hold the string, the
1779 * string is truncated. The copied string is %NULL-terminated.
1780 * If the string is being read by the user process, it is copied
1781 * and a newline '\n' is added. It is truncated if the buffer is
1782 * not large enough.
1783 *
1784 * Returns 0 on success.
1785 */
1786 int proc_dostring(struct ctl_table *table, int write,
1787 void __user *buffer, size_t *lenp, loff_t *ppos)
1788 {
1789 return _proc_do_string(table->data, table->maxlen, write,
1790 buffer, lenp, ppos);
1791 }
1792
1793 static size_t proc_skip_spaces(char **buf)
1794 {
1795 size_t ret;
1796 char *tmp = skip_spaces(*buf);
1797 ret = tmp - *buf;
1798 *buf = tmp;
1799 return ret;
1800 }
1801
1802 static void proc_skip_char(char **buf, size_t *size, const char v)
1803 {
1804 while (*size) {
1805 if (**buf != v)
1806 break;
1807 (*size)--;
1808 (*buf)++;
1809 }
1810 }
1811
1812 #define TMPBUFLEN 22
1813 /**
1814 * proc_get_long - reads an ASCII formatted integer from a user buffer
1815 *
1816 * @buf: a kernel buffer
1817 * @size: size of the kernel buffer
1818 * @val: this is where the number will be stored
1819 * @neg: set to %TRUE if number is negative
1820 * @perm_tr: a vector which contains the allowed trailers
1821 * @perm_tr_len: size of the perm_tr vector
1822 * @tr: pointer to store the trailer character
1823 *
1824 * In case of success %0 is returned and @buf and @size are updated with
1825 * the amount of bytes read. If @tr is non-NULL and a trailing
1826 * character exists (size is non-zero after returning from this
1827 * function), @tr is updated with the trailing character.
1828 */
1829 static int proc_get_long(char **buf, size_t *size,
1830 unsigned long *val, bool *neg,
1831 const char *perm_tr, unsigned perm_tr_len, char *tr)
1832 {
1833 int len;
1834 char *p, tmp[TMPBUFLEN];
1835
1836 if (!*size)
1837 return -EINVAL;
1838
1839 len = *size;
1840 if (len > TMPBUFLEN - 1)
1841 len = TMPBUFLEN - 1;
1842
1843 memcpy(tmp, *buf, len);
1844
1845 tmp[len] = 0;
1846 p = tmp;
1847 if (*p == '-' && *size > 1) {
1848 *neg = true;
1849 p++;
1850 } else
1851 *neg = false;
1852 if (!isdigit(*p))
1853 return -EINVAL;
1854
1855 *val = simple_strtoul(p, &p, 0);
1856
1857 len = p - tmp;
1858
1859 /* We don't know if the next char is whitespace thus we may accept
1860 * invalid integers (e.g. 1234...a) or two integers instead of one
1861 * (e.g. 123...1). So lets not allow such large numbers. */
1862 if (len == TMPBUFLEN - 1)
1863 return -EINVAL;
1864
1865 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1866 return -EINVAL;
1867
1868 if (tr && (len < *size))
1869 *tr = *p;
1870
1871 *buf += len;
1872 *size -= len;
1873
1874 return 0;
1875 }
1876
1877 /**
1878 * proc_put_long - converts an integer to a decimal ASCII formatted string
1879 *
1880 * @buf: the user buffer
1881 * @size: the size of the user buffer
1882 * @val: the integer to be converted
1883 * @neg: sign of the number, %TRUE for negative
1884 *
1885 * In case of success %0 is returned and @buf and @size are updated with
1886 * the amount of bytes written.
1887 */
1888 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1889 bool neg)
1890 {
1891 int len;
1892 char tmp[TMPBUFLEN], *p = tmp;
1893
1894 sprintf(p, "%s%lu", neg ? "-" : "", val);
1895 len = strlen(tmp);
1896 if (len > *size)
1897 len = *size;
1898 if (copy_to_user(*buf, tmp, len))
1899 return -EFAULT;
1900 *size -= len;
1901 *buf += len;
1902 return 0;
1903 }
1904 #undef TMPBUFLEN
1905
1906 static int proc_put_char(void __user **buf, size_t *size, char c)
1907 {
1908 if (*size) {
1909 char __user **buffer = (char __user **)buf;
1910 if (put_user(c, *buffer))
1911 return -EFAULT;
1912 (*size)--, (*buffer)++;
1913 *buf = *buffer;
1914 }
1915 return 0;
1916 }
1917
1918 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1919 int *valp,
1920 int write, void *data)
1921 {
1922 if (write) {
1923 *valp = *negp ? -*lvalp : *lvalp;
1924 } else {
1925 int val = *valp;
1926 if (val < 0) {
1927 *negp = true;
1928 *lvalp = (unsigned long)-val;
1929 } else {
1930 *negp = false;
1931 *lvalp = (unsigned long)val;
1932 }
1933 }
1934 return 0;
1935 }
1936
1937 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1938
1939 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1940 int write, void __user *buffer,
1941 size_t *lenp, loff_t *ppos,
1942 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1943 int write, void *data),
1944 void *data)
1945 {
1946 int *i, vleft, first = 1, err = 0;
1947 unsigned long page = 0;
1948 size_t left;
1949 char *kbuf;
1950
1951 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1952 *lenp = 0;
1953 return 0;
1954 }
1955
1956 i = (int *) tbl_data;
1957 vleft = table->maxlen / sizeof(*i);
1958 left = *lenp;
1959
1960 if (!conv)
1961 conv = do_proc_dointvec_conv;
1962
1963 if (write) {
1964 if (left > PAGE_SIZE - 1)
1965 left = PAGE_SIZE - 1;
1966 page = __get_free_page(GFP_TEMPORARY);
1967 kbuf = (char *) page;
1968 if (!kbuf)
1969 return -ENOMEM;
1970 if (copy_from_user(kbuf, buffer, left)) {
1971 err = -EFAULT;
1972 goto free;
1973 }
1974 kbuf[left] = 0;
1975 }
1976
1977 for (; left && vleft--; i++, first=0) {
1978 unsigned long lval;
1979 bool neg;
1980
1981 if (write) {
1982 left -= proc_skip_spaces(&kbuf);
1983
1984 if (!left)
1985 break;
1986 err = proc_get_long(&kbuf, &left, &lval, &neg,
1987 proc_wspace_sep,
1988 sizeof(proc_wspace_sep), NULL);
1989 if (err)
1990 break;
1991 if (conv(&neg, &lval, i, 1, data)) {
1992 err = -EINVAL;
1993 break;
1994 }
1995 } else {
1996 if (conv(&neg, &lval, i, 0, data)) {
1997 err = -EINVAL;
1998 break;
1999 }
2000 if (!first)
2001 err = proc_put_char(&buffer, &left, '\t');
2002 if (err)
2003 break;
2004 err = proc_put_long(&buffer, &left, lval, neg);
2005 if (err)
2006 break;
2007 }
2008 }
2009
2010 if (!write && !first && left && !err)
2011 err = proc_put_char(&buffer, &left, '\n');
2012 if (write && !err && left)
2013 left -= proc_skip_spaces(&kbuf);
2014 free:
2015 if (write) {
2016 free_page(page);
2017 if (first)
2018 return err ? : -EINVAL;
2019 }
2020 *lenp -= left;
2021 *ppos += *lenp;
2022 return err;
2023 }
2024
2025 static int do_proc_dointvec(struct ctl_table *table, int write,
2026 void __user *buffer, size_t *lenp, loff_t *ppos,
2027 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2028 int write, void *data),
2029 void *data)
2030 {
2031 return __do_proc_dointvec(table->data, table, write,
2032 buffer, lenp, ppos, conv, data);
2033 }
2034
2035 /**
2036 * proc_dointvec - read a vector of integers
2037 * @table: the sysctl table
2038 * @write: %TRUE if this is a write to the sysctl file
2039 * @buffer: the user buffer
2040 * @lenp: the size of the user buffer
2041 * @ppos: file position
2042 *
2043 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2044 * values from/to the user buffer, treated as an ASCII string.
2045 *
2046 * Returns 0 on success.
2047 */
2048 int proc_dointvec(struct ctl_table *table, int write,
2049 void __user *buffer, size_t *lenp, loff_t *ppos)
2050 {
2051 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2052 NULL,NULL);
2053 }
2054
2055 /*
2056 * Taint values can only be increased
2057 * This means we can safely use a temporary.
2058 */
2059 static int proc_taint(struct ctl_table *table, int write,
2060 void __user *buffer, size_t *lenp, loff_t *ppos)
2061 {
2062 struct ctl_table t;
2063 unsigned long tmptaint = get_taint();
2064 int err;
2065
2066 if (write && !capable(CAP_SYS_ADMIN))
2067 return -EPERM;
2068
2069 t = *table;
2070 t.data = &tmptaint;
2071 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2072 if (err < 0)
2073 return err;
2074
2075 if (write) {
2076 /*
2077 * Poor man's atomic or. Not worth adding a primitive
2078 * to everyone's atomic.h for this
2079 */
2080 int i;
2081 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2082 if ((tmptaint >> i) & 1)
2083 add_taint(i, LOCKDEP_STILL_OK);
2084 }
2085 }
2086
2087 return err;
2088 }
2089
2090 #ifdef CONFIG_PRINTK
2091 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2092 void __user *buffer, size_t *lenp, loff_t *ppos)
2093 {
2094 if (write && !capable(CAP_SYS_ADMIN))
2095 return -EPERM;
2096
2097 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2098 }
2099 #endif
2100
2101 struct do_proc_dointvec_minmax_conv_param {
2102 int *min;
2103 int *max;
2104 };
2105
2106 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2107 int *valp,
2108 int write, void *data)
2109 {
2110 struct do_proc_dointvec_minmax_conv_param *param = data;
2111 if (write) {
2112 int val = *negp ? -*lvalp : *lvalp;
2113 if ((param->min && *param->min > val) ||
2114 (param->max && *param->max < val))
2115 return -EINVAL;
2116 *valp = val;
2117 } else {
2118 int val = *valp;
2119 if (val < 0) {
2120 *negp = true;
2121 *lvalp = (unsigned long)-val;
2122 } else {
2123 *negp = false;
2124 *lvalp = (unsigned long)val;
2125 }
2126 }
2127 return 0;
2128 }
2129
2130 /**
2131 * proc_dointvec_minmax - read a vector of integers with min/max values
2132 * @table: the sysctl table
2133 * @write: %TRUE if this is a write to the sysctl file
2134 * @buffer: the user buffer
2135 * @lenp: the size of the user buffer
2136 * @ppos: file position
2137 *
2138 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2139 * values from/to the user buffer, treated as an ASCII string.
2140 *
2141 * This routine will ensure the values are within the range specified by
2142 * table->extra1 (min) and table->extra2 (max).
2143 *
2144 * Returns 0 on success.
2145 */
2146 int proc_dointvec_minmax(struct ctl_table *table, int write,
2147 void __user *buffer, size_t *lenp, loff_t *ppos)
2148 {
2149 struct do_proc_dointvec_minmax_conv_param param = {
2150 .min = (int *) table->extra1,
2151 .max = (int *) table->extra2,
2152 };
2153 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2154 do_proc_dointvec_minmax_conv, &param);
2155 }
2156
2157 static void validate_coredump_safety(void)
2158 {
2159 #ifdef CONFIG_COREDUMP
2160 if (suid_dumpable == SUID_DUMP_ROOT &&
2161 core_pattern[0] != '/' && core_pattern[0] != '|') {
2162 printk(KERN_WARNING "Unsafe core_pattern used with "\
2163 "suid_dumpable=2. Pipe handler or fully qualified "\
2164 "core dump path required.\n");
2165 }
2166 #endif
2167 }
2168
2169 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2170 void __user *buffer, size_t *lenp, loff_t *ppos)
2171 {
2172 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2173 if (!error)
2174 validate_coredump_safety();
2175 return error;
2176 }
2177
2178 #ifdef CONFIG_COREDUMP
2179 static int proc_dostring_coredump(struct ctl_table *table, int write,
2180 void __user *buffer, size_t *lenp, loff_t *ppos)
2181 {
2182 int error = proc_dostring(table, write, buffer, lenp, ppos);
2183 if (!error)
2184 validate_coredump_safety();
2185 return error;
2186 }
2187 #endif
2188
2189 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2190 void __user *buffer,
2191 size_t *lenp, loff_t *ppos,
2192 unsigned long convmul,
2193 unsigned long convdiv)
2194 {
2195 unsigned long *i, *min, *max;
2196 int vleft, first = 1, err = 0;
2197 unsigned long page = 0;
2198 size_t left;
2199 char *kbuf;
2200
2201 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2202 *lenp = 0;
2203 return 0;
2204 }
2205
2206 i = (unsigned long *) data;
2207 min = (unsigned long *) table->extra1;
2208 max = (unsigned long *) table->extra2;
2209 vleft = table->maxlen / sizeof(unsigned long);
2210 left = *lenp;
2211
2212 if (write) {
2213 if (left > PAGE_SIZE - 1)
2214 left = PAGE_SIZE - 1;
2215 page = __get_free_page(GFP_TEMPORARY);
2216 kbuf = (char *) page;
2217 if (!kbuf)
2218 return -ENOMEM;
2219 if (copy_from_user(kbuf, buffer, left)) {
2220 err = -EFAULT;
2221 goto free;
2222 }
2223 kbuf[left] = 0;
2224 }
2225
2226 for (; left && vleft--; i++, first = 0) {
2227 unsigned long val;
2228
2229 if (write) {
2230 bool neg;
2231
2232 left -= proc_skip_spaces(&kbuf);
2233
2234 err = proc_get_long(&kbuf, &left, &val, &neg,
2235 proc_wspace_sep,
2236 sizeof(proc_wspace_sep), NULL);
2237 if (err)
2238 break;
2239 if (neg)
2240 continue;
2241 if ((min && val < *min) || (max && val > *max))
2242 continue;
2243 *i = val;
2244 } else {
2245 val = convdiv * (*i) / convmul;
2246 if (!first) {
2247 err = proc_put_char(&buffer, &left, '\t');
2248 if (err)
2249 break;
2250 }
2251 err = proc_put_long(&buffer, &left, val, false);
2252 if (err)
2253 break;
2254 }
2255 }
2256
2257 if (!write && !first && left && !err)
2258 err = proc_put_char(&buffer, &left, '\n');
2259 if (write && !err)
2260 left -= proc_skip_spaces(&kbuf);
2261 free:
2262 if (write) {
2263 free_page(page);
2264 if (first)
2265 return err ? : -EINVAL;
2266 }
2267 *lenp -= left;
2268 *ppos += *lenp;
2269 return err;
2270 }
2271
2272 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2273 void __user *buffer,
2274 size_t *lenp, loff_t *ppos,
2275 unsigned long convmul,
2276 unsigned long convdiv)
2277 {
2278 return __do_proc_doulongvec_minmax(table->data, table, write,
2279 buffer, lenp, ppos, convmul, convdiv);
2280 }
2281
2282 /**
2283 * proc_doulongvec_minmax - read a vector of long integers 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.
2292 *
2293 * This routine will ensure the values are within the range specified by
2294 * table->extra1 (min) and table->extra2 (max).
2295 *
2296 * Returns 0 on success.
2297 */
2298 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2299 void __user *buffer, size_t *lenp, loff_t *ppos)
2300 {
2301 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2302 }
2303
2304 /**
2305 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2306 * @table: the sysctl table
2307 * @write: %TRUE if this is a write to the sysctl file
2308 * @buffer: the user buffer
2309 * @lenp: the size of the user buffer
2310 * @ppos: file position
2311 *
2312 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2313 * values from/to the user buffer, treated as an ASCII string. The values
2314 * are treated as milliseconds, and converted to jiffies when they are stored.
2315 *
2316 * This routine will ensure the values are within the range specified by
2317 * table->extra1 (min) and table->extra2 (max).
2318 *
2319 * Returns 0 on success.
2320 */
2321 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2322 void __user *buffer,
2323 size_t *lenp, loff_t *ppos)
2324 {
2325 return do_proc_doulongvec_minmax(table, write, buffer,
2326 lenp, ppos, HZ, 1000l);
2327 }
2328
2329
2330 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2331 int *valp,
2332 int write, void *data)
2333 {
2334 if (write) {
2335 if (*lvalp > LONG_MAX / HZ)
2336 return 1;
2337 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2338 } else {
2339 int val = *valp;
2340 unsigned long lval;
2341 if (val < 0) {
2342 *negp = true;
2343 lval = (unsigned long)-val;
2344 } else {
2345 *negp = false;
2346 lval = (unsigned long)val;
2347 }
2348 *lvalp = lval / HZ;
2349 }
2350 return 0;
2351 }
2352
2353 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2354 int *valp,
2355 int write, void *data)
2356 {
2357 if (write) {
2358 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2359 return 1;
2360 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2361 } else {
2362 int val = *valp;
2363 unsigned long lval;
2364 if (val < 0) {
2365 *negp = true;
2366 lval = (unsigned long)-val;
2367 } else {
2368 *negp = false;
2369 lval = (unsigned long)val;
2370 }
2371 *lvalp = jiffies_to_clock_t(lval);
2372 }
2373 return 0;
2374 }
2375
2376 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2377 int *valp,
2378 int write, void *data)
2379 {
2380 if (write) {
2381 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2382
2383 if (jif > INT_MAX)
2384 return 1;
2385 *valp = (int)jif;
2386 } else {
2387 int val = *valp;
2388 unsigned long lval;
2389 if (val < 0) {
2390 *negp = true;
2391 lval = (unsigned long)-val;
2392 } else {
2393 *negp = false;
2394 lval = (unsigned long)val;
2395 }
2396 *lvalp = jiffies_to_msecs(lval);
2397 }
2398 return 0;
2399 }
2400
2401 /**
2402 * proc_dointvec_jiffies - read a vector of integers as 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: 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 seconds, and are converted into
2412 * jiffies.
2413 *
2414 * Returns 0 on success.
2415 */
2416 int proc_dointvec_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_jiffies_conv,NULL);
2421 }
2422
2423 /**
2424 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
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: pointer to the file position
2430 *
2431 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2432 * values from/to the user buffer, treated as an ASCII string.
2433 * The values read are assumed to be in 1/USER_HZ seconds, and
2434 * are converted into jiffies.
2435 *
2436 * Returns 0 on success.
2437 */
2438 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2439 void __user *buffer, size_t *lenp, loff_t *ppos)
2440 {
2441 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2442 do_proc_dointvec_userhz_jiffies_conv,NULL);
2443 }
2444
2445 /**
2446 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2447 * @table: the sysctl table
2448 * @write: %TRUE if this is a write to the sysctl file
2449 * @buffer: the user buffer
2450 * @lenp: the size of the user buffer
2451 * @ppos: file position
2452 * @ppos: the current position in the file
2453 *
2454 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2455 * values from/to the user buffer, treated as an ASCII string.
2456 * The values read are assumed to be in 1/1000 seconds, and
2457 * are converted into jiffies.
2458 *
2459 * Returns 0 on success.
2460 */
2461 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2462 void __user *buffer, size_t *lenp, loff_t *ppos)
2463 {
2464 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2465 do_proc_dointvec_ms_jiffies_conv, NULL);
2466 }
2467
2468 static int proc_do_cad_pid(struct ctl_table *table, int write,
2469 void __user *buffer, size_t *lenp, loff_t *ppos)
2470 {
2471 struct pid *new_pid;
2472 pid_t tmp;
2473 int r;
2474
2475 tmp = pid_vnr(cad_pid);
2476
2477 r = __do_proc_dointvec(&tmp, table, write, buffer,
2478 lenp, ppos, NULL, NULL);
2479 if (r || !write)
2480 return r;
2481
2482 new_pid = find_get_pid(tmp);
2483 if (!new_pid)
2484 return -ESRCH;
2485
2486 put_pid(xchg(&cad_pid, new_pid));
2487 return 0;
2488 }
2489
2490 /**
2491 * proc_do_large_bitmap - read/write from/to a large bitmap
2492 * @table: the sysctl table
2493 * @write: %TRUE if this is a write to the sysctl file
2494 * @buffer: the user buffer
2495 * @lenp: the size of the user buffer
2496 * @ppos: file position
2497 *
2498 * The bitmap is stored at table->data and the bitmap length (in bits)
2499 * in table->maxlen.
2500 *
2501 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2502 * large bitmaps may be represented in a compact manner. Writing into
2503 * the file will clear the bitmap then update it with the given input.
2504 *
2505 * Returns 0 on success.
2506 */
2507 int proc_do_large_bitmap(struct ctl_table *table, int write,
2508 void __user *buffer, size_t *lenp, loff_t *ppos)
2509 {
2510 int err = 0;
2511 bool first = 1;
2512 size_t left = *lenp;
2513 unsigned long bitmap_len = table->maxlen;
2514 unsigned long *bitmap = (unsigned long *) table->data;
2515 unsigned long *tmp_bitmap = NULL;
2516 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2517
2518 if (!bitmap_len || !left || (*ppos && !write)) {
2519 *lenp = 0;
2520 return 0;
2521 }
2522
2523 if (write) {
2524 unsigned long page = 0;
2525 char *kbuf;
2526
2527 if (left > PAGE_SIZE - 1)
2528 left = PAGE_SIZE - 1;
2529
2530 page = __get_free_page(GFP_TEMPORARY);
2531 kbuf = (char *) page;
2532 if (!kbuf)
2533 return -ENOMEM;
2534 if (copy_from_user(kbuf, buffer, left)) {
2535 free_page(page);
2536 return -EFAULT;
2537 }
2538 kbuf[left] = 0;
2539
2540 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2541 GFP_KERNEL);
2542 if (!tmp_bitmap) {
2543 free_page(page);
2544 return -ENOMEM;
2545 }
2546 proc_skip_char(&kbuf, &left, '\n');
2547 while (!err && left) {
2548 unsigned long val_a, val_b;
2549 bool neg;
2550
2551 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2552 sizeof(tr_a), &c);
2553 if (err)
2554 break;
2555 if (val_a >= bitmap_len || neg) {
2556 err = -EINVAL;
2557 break;
2558 }
2559
2560 val_b = val_a;
2561 if (left) {
2562 kbuf++;
2563 left--;
2564 }
2565
2566 if (c == '-') {
2567 err = proc_get_long(&kbuf, &left, &val_b,
2568 &neg, tr_b, sizeof(tr_b),
2569 &c);
2570 if (err)
2571 break;
2572 if (val_b >= bitmap_len || neg ||
2573 val_a > val_b) {
2574 err = -EINVAL;
2575 break;
2576 }
2577 if (left) {
2578 kbuf++;
2579 left--;
2580 }
2581 }
2582
2583 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2584 first = 0;
2585 proc_skip_char(&kbuf, &left, '\n');
2586 }
2587 free_page(page);
2588 } else {
2589 unsigned long bit_a, bit_b = 0;
2590
2591 while (left) {
2592 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2593 if (bit_a >= bitmap_len)
2594 break;
2595 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2596 bit_a + 1) - 1;
2597
2598 if (!first) {
2599 err = proc_put_char(&buffer, &left, ',');
2600 if (err)
2601 break;
2602 }
2603 err = proc_put_long(&buffer, &left, bit_a, false);
2604 if (err)
2605 break;
2606 if (bit_a != bit_b) {
2607 err = proc_put_char(&buffer, &left, '-');
2608 if (err)
2609 break;
2610 err = proc_put_long(&buffer, &left, bit_b, false);
2611 if (err)
2612 break;
2613 }
2614
2615 first = 0; bit_b++;
2616 }
2617 if (!err)
2618 err = proc_put_char(&buffer, &left, '\n');
2619 }
2620
2621 if (!err) {
2622 if (write) {
2623 if (*ppos)
2624 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2625 else
2626 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2627 }
2628 kfree(tmp_bitmap);
2629 *lenp -= left;
2630 *ppos += *lenp;
2631 return 0;
2632 } else {
2633 kfree(tmp_bitmap);
2634 return err;
2635 }
2636 }
2637
2638 #else /* CONFIG_PROC_SYSCTL */
2639
2640 int proc_dostring(struct ctl_table *table, int write,
2641 void __user *buffer, size_t *lenp, loff_t *ppos)
2642 {
2643 return -ENOSYS;
2644 }
2645
2646 int proc_dointvec(struct ctl_table *table, int write,
2647 void __user *buffer, size_t *lenp, loff_t *ppos)
2648 {
2649 return -ENOSYS;
2650 }
2651
2652 int proc_dointvec_minmax(struct ctl_table *table, int write,
2653 void __user *buffer, size_t *lenp, loff_t *ppos)
2654 {
2655 return -ENOSYS;
2656 }
2657
2658 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2659 void __user *buffer, size_t *lenp, loff_t *ppos)
2660 {
2661 return -ENOSYS;
2662 }
2663
2664 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2665 void __user *buffer, size_t *lenp, loff_t *ppos)
2666 {
2667 return -ENOSYS;
2668 }
2669
2670 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2671 void __user *buffer, size_t *lenp, loff_t *ppos)
2672 {
2673 return -ENOSYS;
2674 }
2675
2676 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2677 void __user *buffer, size_t *lenp, loff_t *ppos)
2678 {
2679 return -ENOSYS;
2680 }
2681
2682 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2683 void __user *buffer,
2684 size_t *lenp, loff_t *ppos)
2685 {
2686 return -ENOSYS;
2687 }
2688
2689
2690 #endif /* CONFIG_PROC_SYSCTL */
2691
2692 /*
2693 * No sense putting this after each symbol definition, twice,
2694 * exception granted :-)
2695 */
2696 EXPORT_SYMBOL(proc_dointvec);
2697 EXPORT_SYMBOL(proc_dointvec_jiffies);
2698 EXPORT_SYMBOL(proc_dointvec_minmax);
2699 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2700 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2701 EXPORT_SYMBOL(proc_dostring);
2702 EXPORT_SYMBOL(proc_doulongvec_minmax);
2703 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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