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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
116 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
119 #endif
120
121 static int __maybe_unused neg_one = -1;
122
123 static int zero;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused four = 4;
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
140 static int ngroups_max = NGROUPS_MAX;
141 static const int cap_last_cap = CAP_LAST_CAP;
142
143 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
144 #ifdef CONFIG_DETECT_HUNG_TASK
145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
146 #endif
147
148 #ifdef CONFIG_INOTIFY_USER
149 #include <linux/inotify.h>
150 #endif
151 #ifdef CONFIG_SPARC
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
172 #define SYSCTL_WRITES_LEGACY -1
173 #define SYSCTL_WRITES_WARN 0
174 #define SYSCTL_WRITES_STRICT 1
175
176 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
177
178 static int proc_do_cad_pid(struct ctl_table *table, int write,
179 void __user *buffer, size_t *lenp, loff_t *ppos);
180 static int proc_taint(struct ctl_table *table, int write,
181 void __user *buffer, size_t *lenp, loff_t *ppos);
182 #endif
183
184 #ifdef CONFIG_PRINTK
185 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
187 #endif
188
189 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
191 #ifdef CONFIG_COREDUMP
192 static int proc_dostring_coredump(struct ctl_table *table, int write,
193 void __user *buffer, size_t *lenp, loff_t *ppos);
194 #endif
195
196 #ifdef CONFIG_MAGIC_SYSRQ
197 /* Note: sysrq code uses it's own private copy */
198 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
199
200 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
201 void __user *buffer, size_t *lenp,
202 loff_t *ppos)
203 {
204 int error;
205
206 error = proc_dointvec(table, write, buffer, lenp, ppos);
207 if (error)
208 return error;
209
210 if (write)
211 sysrq_toggle_support(__sysrq_enabled);
212
213 return 0;
214 }
215
216 #endif
217
218 static struct ctl_table kern_table[];
219 static struct ctl_table vm_table[];
220 static struct ctl_table fs_table[];
221 static struct ctl_table debug_table[];
222 static struct ctl_table dev_table[];
223 extern struct ctl_table random_table[];
224 #ifdef CONFIG_EPOLL
225 extern struct ctl_table epoll_table[];
226 #endif
227
228 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
229 int sysctl_legacy_va_layout;
230 #endif
231
232 /* The default sysctl tables: */
233
234 static struct ctl_table sysctl_base_table[] = {
235 {
236 .procname = "kernel",
237 .mode = 0555,
238 .child = kern_table,
239 },
240 {
241 .procname = "vm",
242 .mode = 0555,
243 .child = vm_table,
244 },
245 {
246 .procname = "fs",
247 .mode = 0555,
248 .child = fs_table,
249 },
250 {
251 .procname = "debug",
252 .mode = 0555,
253 .child = debug_table,
254 },
255 {
256 .procname = "dev",
257 .mode = 0555,
258 .child = dev_table,
259 },
260 { }
261 };
262
263 #ifdef CONFIG_SCHED_DEBUG
264 static int min_sched_granularity_ns = 100000; /* 100 usecs */
265 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
266 static int min_wakeup_granularity_ns; /* 0 usecs */
267 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
268 #ifdef CONFIG_SMP
269 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
270 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
271 #endif /* CONFIG_SMP */
272 #endif /* CONFIG_SCHED_DEBUG */
273
274 #ifdef CONFIG_COMPACTION
275 static int min_extfrag_threshold;
276 static int max_extfrag_threshold = 1000;
277 #endif
278
279 static struct ctl_table kern_table[] = {
280 {
281 .procname = "sched_child_runs_first",
282 .data = &sysctl_sched_child_runs_first,
283 .maxlen = sizeof(unsigned int),
284 .mode = 0644,
285 .proc_handler = proc_dointvec,
286 },
287 #ifdef CONFIG_SCHED_DEBUG
288 {
289 .procname = "sched_min_granularity_ns",
290 .data = &sysctl_sched_min_granularity,
291 .maxlen = sizeof(unsigned int),
292 .mode = 0644,
293 .proc_handler = sched_proc_update_handler,
294 .extra1 = &min_sched_granularity_ns,
295 .extra2 = &max_sched_granularity_ns,
296 },
297 {
298 .procname = "sched_latency_ns",
299 .data = &sysctl_sched_latency,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
302 .proc_handler = sched_proc_update_handler,
303 .extra1 = &min_sched_granularity_ns,
304 .extra2 = &max_sched_granularity_ns,
305 },
306 {
307 .procname = "sched_wakeup_granularity_ns",
308 .data = &sysctl_sched_wakeup_granularity,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
311 .proc_handler = sched_proc_update_handler,
312 .extra1 = &min_wakeup_granularity_ns,
313 .extra2 = &max_wakeup_granularity_ns,
314 },
315 #ifdef CONFIG_SMP
316 {
317 .procname = "sched_tunable_scaling",
318 .data = &sysctl_sched_tunable_scaling,
319 .maxlen = sizeof(enum sched_tunable_scaling),
320 .mode = 0644,
321 .proc_handler = sched_proc_update_handler,
322 .extra1 = &min_sched_tunable_scaling,
323 .extra2 = &max_sched_tunable_scaling,
324 },
325 {
326 .procname = "sched_migration_cost_ns",
327 .data = &sysctl_sched_migration_cost,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
330 .proc_handler = proc_dointvec,
331 },
332 {
333 .procname = "sched_nr_migrate",
334 .data = &sysctl_sched_nr_migrate,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
337 .proc_handler = proc_dointvec,
338 },
339 {
340 .procname = "sched_time_avg_ms",
341 .data = &sysctl_sched_time_avg,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
344 .proc_handler = proc_dointvec,
345 },
346 {
347 .procname = "sched_shares_window_ns",
348 .data = &sysctl_sched_shares_window,
349 .maxlen = sizeof(unsigned int),
350 .mode = 0644,
351 .proc_handler = proc_dointvec,
352 },
353 {
354 .procname = "timer_migration",
355 .data = &sysctl_timer_migration,
356 .maxlen = sizeof(unsigned int),
357 .mode = 0644,
358 .proc_handler = proc_dointvec_minmax,
359 .extra1 = &zero,
360 .extra2 = &one,
361 },
362 #endif /* CONFIG_SMP */
363 #ifdef CONFIG_NUMA_BALANCING
364 {
365 .procname = "numa_balancing_scan_delay_ms",
366 .data = &sysctl_numa_balancing_scan_delay,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec,
370 },
371 {
372 .procname = "numa_balancing_scan_period_min_ms",
373 .data = &sysctl_numa_balancing_scan_period_min,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
378 {
379 .procname = "numa_balancing_scan_period_max_ms",
380 .data = &sysctl_numa_balancing_scan_period_max,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec,
384 },
385 {
386 .procname = "numa_balancing_scan_size_mb",
387 .data = &sysctl_numa_balancing_scan_size,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec_minmax,
391 .extra1 = &one,
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 {
502 .procname = "sysctl_writes_strict",
503 .data = &sysctl_writes_strict,
504 .maxlen = sizeof(int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec_minmax,
507 .extra1 = &neg_one,
508 .extra2 = &one,
509 },
510 #endif
511 #ifdef CONFIG_LATENCYTOP
512 {
513 .procname = "latencytop",
514 .data = &latencytop_enabled,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519 #endif
520 #ifdef CONFIG_BLK_DEV_INITRD
521 {
522 .procname = "real-root-dev",
523 .data = &real_root_dev,
524 .maxlen = sizeof(int),
525 .mode = 0644,
526 .proc_handler = proc_dointvec,
527 },
528 #endif
529 {
530 .procname = "print-fatal-signals",
531 .data = &print_fatal_signals,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = proc_dointvec,
535 },
536 #ifdef CONFIG_SPARC
537 {
538 .procname = "reboot-cmd",
539 .data = reboot_command,
540 .maxlen = 256,
541 .mode = 0644,
542 .proc_handler = proc_dostring,
543 },
544 {
545 .procname = "stop-a",
546 .data = &stop_a_enabled,
547 .maxlen = sizeof (int),
548 .mode = 0644,
549 .proc_handler = proc_dointvec,
550 },
551 {
552 .procname = "scons-poweroff",
553 .data = &scons_pwroff,
554 .maxlen = sizeof (int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec,
557 },
558 #endif
559 #ifdef CONFIG_SPARC64
560 {
561 .procname = "tsb-ratio",
562 .data = &sysctl_tsb_ratio,
563 .maxlen = sizeof (int),
564 .mode = 0644,
565 .proc_handler = proc_dointvec,
566 },
567 #endif
568 #ifdef __hppa__
569 {
570 .procname = "soft-power",
571 .data = &pwrsw_enabled,
572 .maxlen = sizeof (int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec,
575 },
576 #endif
577 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
578 {
579 .procname = "unaligned-trap",
580 .data = &unaligned_enabled,
581 .maxlen = sizeof (int),
582 .mode = 0644,
583 .proc_handler = proc_dointvec,
584 },
585 #endif
586 {
587 .procname = "ctrl-alt-del",
588 .data = &C_A_D,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec,
592 },
593 #ifdef CONFIG_FUNCTION_TRACER
594 {
595 .procname = "ftrace_enabled",
596 .data = &ftrace_enabled,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = ftrace_enable_sysctl,
600 },
601 #endif
602 #ifdef CONFIG_STACK_TRACER
603 {
604 .procname = "stack_tracer_enabled",
605 .data = &stack_tracer_enabled,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = stack_trace_sysctl,
609 },
610 #endif
611 #ifdef CONFIG_TRACING
612 {
613 .procname = "ftrace_dump_on_oops",
614 .data = &ftrace_dump_on_oops,
615 .maxlen = sizeof(int),
616 .mode = 0644,
617 .proc_handler = proc_dointvec,
618 },
619 {
620 .procname = "traceoff_on_warning",
621 .data = &__disable_trace_on_warning,
622 .maxlen = sizeof(__disable_trace_on_warning),
623 .mode = 0644,
624 .proc_handler = proc_dointvec,
625 },
626 {
627 .procname = "tracepoint_printk",
628 .data = &tracepoint_printk,
629 .maxlen = sizeof(tracepoint_printk),
630 .mode = 0644,
631 .proc_handler = proc_dointvec,
632 },
633 #endif
634 #ifdef CONFIG_KEXEC
635 {
636 .procname = "kexec_load_disabled",
637 .data = &kexec_load_disabled,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 /* only handle a transition from default "0" to "1" */
641 .proc_handler = proc_dointvec_minmax,
642 .extra1 = &one,
643 .extra2 = &one,
644 },
645 #endif
646 #ifdef CONFIG_MODULES
647 {
648 .procname = "modprobe",
649 .data = &modprobe_path,
650 .maxlen = KMOD_PATH_LEN,
651 .mode = 0644,
652 .proc_handler = proc_dostring,
653 },
654 {
655 .procname = "modules_disabled",
656 .data = &modules_disabled,
657 .maxlen = sizeof(int),
658 .mode = 0644,
659 /* only handle a transition from default "0" to "1" */
660 .proc_handler = proc_dointvec_minmax,
661 .extra1 = &one,
662 .extra2 = &one,
663 },
664 #endif
665 #ifdef CONFIG_UEVENT_HELPER
666 {
667 .procname = "hotplug",
668 .data = &uevent_helper,
669 .maxlen = UEVENT_HELPER_PATH_LEN,
670 .mode = 0644,
671 .proc_handler = proc_dostring,
672 },
673 #endif
674 #ifdef CONFIG_CHR_DEV_SG
675 {
676 .procname = "sg-big-buff",
677 .data = &sg_big_buff,
678 .maxlen = sizeof (int),
679 .mode = 0444,
680 .proc_handler = proc_dointvec,
681 },
682 #endif
683 #ifdef CONFIG_BSD_PROCESS_ACCT
684 {
685 .procname = "acct",
686 .data = &acct_parm,
687 .maxlen = 3*sizeof(int),
688 .mode = 0644,
689 .proc_handler = proc_dointvec,
690 },
691 #endif
692 #ifdef CONFIG_MAGIC_SYSRQ
693 {
694 .procname = "sysrq",
695 .data = &__sysrq_enabled,
696 .maxlen = sizeof (int),
697 .mode = 0644,
698 .proc_handler = sysrq_sysctl_handler,
699 },
700 #endif
701 #ifdef CONFIG_PROC_SYSCTL
702 {
703 .procname = "cad_pid",
704 .data = NULL,
705 .maxlen = sizeof (int),
706 .mode = 0600,
707 .proc_handler = proc_do_cad_pid,
708 },
709 #endif
710 {
711 .procname = "threads-max",
712 .data = &max_threads,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec,
716 },
717 {
718 .procname = "random",
719 .mode = 0555,
720 .child = random_table,
721 },
722 {
723 .procname = "usermodehelper",
724 .mode = 0555,
725 .child = usermodehelper_table,
726 },
727 {
728 .procname = "overflowuid",
729 .data = &overflowuid,
730 .maxlen = sizeof(int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &minolduid,
734 .extra2 = &maxolduid,
735 },
736 {
737 .procname = "overflowgid",
738 .data = &overflowgid,
739 .maxlen = sizeof(int),
740 .mode = 0644,
741 .proc_handler = proc_dointvec_minmax,
742 .extra1 = &minolduid,
743 .extra2 = &maxolduid,
744 },
745 #ifdef CONFIG_S390
746 #ifdef CONFIG_MATHEMU
747 {
748 .procname = "ieee_emulation_warnings",
749 .data = &sysctl_ieee_emulation_warnings,
750 .maxlen = sizeof(int),
751 .mode = 0644,
752 .proc_handler = proc_dointvec,
753 },
754 #endif
755 {
756 .procname = "userprocess_debug",
757 .data = &show_unhandled_signals,
758 .maxlen = sizeof(int),
759 .mode = 0644,
760 .proc_handler = proc_dointvec,
761 },
762 #endif
763 {
764 .procname = "pid_max",
765 .data = &pid_max,
766 .maxlen = sizeof (int),
767 .mode = 0644,
768 .proc_handler = proc_dointvec_minmax,
769 .extra1 = &pid_max_min,
770 .extra2 = &pid_max_max,
771 },
772 {
773 .procname = "panic_on_oops",
774 .data = &panic_on_oops,
775 .maxlen = sizeof(int),
776 .mode = 0644,
777 .proc_handler = proc_dointvec,
778 },
779 #if defined CONFIG_PRINTK
780 {
781 .procname = "printk",
782 .data = &console_loglevel,
783 .maxlen = 4*sizeof(int),
784 .mode = 0644,
785 .proc_handler = proc_dointvec,
786 },
787 {
788 .procname = "printk_ratelimit",
789 .data = &printk_ratelimit_state.interval,
790 .maxlen = sizeof(int),
791 .mode = 0644,
792 .proc_handler = proc_dointvec_jiffies,
793 },
794 {
795 .procname = "printk_ratelimit_burst",
796 .data = &printk_ratelimit_state.burst,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec,
800 },
801 {
802 .procname = "printk_delay",
803 .data = &printk_delay_msec,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec_minmax,
807 .extra1 = &zero,
808 .extra2 = &ten_thousand,
809 },
810 {
811 .procname = "dmesg_restrict",
812 .data = &dmesg_restrict,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec_minmax_sysadmin,
816 .extra1 = &zero,
817 .extra2 = &one,
818 },
819 {
820 .procname = "kptr_restrict",
821 .data = &kptr_restrict,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec_minmax_sysadmin,
825 .extra1 = &zero,
826 .extra2 = &two,
827 },
828 #endif
829 {
830 .procname = "ngroups_max",
831 .data = &ngroups_max,
832 .maxlen = sizeof (int),
833 .mode = 0444,
834 .proc_handler = proc_dointvec,
835 },
836 {
837 .procname = "cap_last_cap",
838 .data = (void *)&cap_last_cap,
839 .maxlen = sizeof(int),
840 .mode = 0444,
841 .proc_handler = proc_dointvec,
842 },
843 #if defined(CONFIG_LOCKUP_DETECTOR)
844 {
845 .procname = "watchdog",
846 .data = &watchdog_user_enabled,
847 .maxlen = sizeof (int),
848 .mode = 0644,
849 .proc_handler = proc_dowatchdog,
850 .extra1 = &zero,
851 .extra2 = &one,
852 },
853 {
854 .procname = "watchdog_thresh",
855 .data = &watchdog_thresh,
856 .maxlen = sizeof(int),
857 .mode = 0644,
858 .proc_handler = proc_dowatchdog,
859 .extra1 = &zero,
860 .extra2 = &sixty,
861 },
862 {
863 .procname = "softlockup_panic",
864 .data = &softlockup_panic,
865 .maxlen = sizeof(int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec_minmax,
868 .extra1 = &zero,
869 .extra2 = &one,
870 },
871 #ifdef CONFIG_SMP
872 {
873 .procname = "softlockup_all_cpu_backtrace",
874 .data = &sysctl_softlockup_all_cpu_backtrace,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec_minmax,
878 .extra1 = &zero,
879 .extra2 = &one,
880 },
881 #endif /* CONFIG_SMP */
882 {
883 .procname = "nmi_watchdog",
884 .data = &watchdog_user_enabled,
885 .maxlen = sizeof (int),
886 .mode = 0644,
887 .proc_handler = proc_dowatchdog,
888 .extra1 = &zero,
889 .extra2 = &one,
890 },
891 #endif
892 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
893 {
894 .procname = "unknown_nmi_panic",
895 .data = &unknown_nmi_panic,
896 .maxlen = sizeof (int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec,
899 },
900 #endif
901 #if defined(CONFIG_X86)
902 {
903 .procname = "panic_on_unrecovered_nmi",
904 .data = &panic_on_unrecovered_nmi,
905 .maxlen = sizeof(int),
906 .mode = 0644,
907 .proc_handler = proc_dointvec,
908 },
909 {
910 .procname = "panic_on_io_nmi",
911 .data = &panic_on_io_nmi,
912 .maxlen = sizeof(int),
913 .mode = 0644,
914 .proc_handler = proc_dointvec,
915 },
916 #ifdef CONFIG_DEBUG_STACKOVERFLOW
917 {
918 .procname = "panic_on_stackoverflow",
919 .data = &sysctl_panic_on_stackoverflow,
920 .maxlen = sizeof(int),
921 .mode = 0644,
922 .proc_handler = proc_dointvec,
923 },
924 #endif
925 {
926 .procname = "bootloader_type",
927 .data = &bootloader_type,
928 .maxlen = sizeof (int),
929 .mode = 0444,
930 .proc_handler = proc_dointvec,
931 },
932 {
933 .procname = "bootloader_version",
934 .data = &bootloader_version,
935 .maxlen = sizeof (int),
936 .mode = 0444,
937 .proc_handler = proc_dointvec,
938 },
939 {
940 .procname = "kstack_depth_to_print",
941 .data = &kstack_depth_to_print,
942 .maxlen = sizeof(int),
943 .mode = 0644,
944 .proc_handler = proc_dointvec,
945 },
946 {
947 .procname = "io_delay_type",
948 .data = &io_delay_type,
949 .maxlen = sizeof(int),
950 .mode = 0644,
951 .proc_handler = proc_dointvec,
952 },
953 #endif
954 #if defined(CONFIG_MMU)
955 {
956 .procname = "randomize_va_space",
957 .data = &randomize_va_space,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec,
961 },
962 #endif
963 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
964 {
965 .procname = "spin_retry",
966 .data = &spin_retry,
967 .maxlen = sizeof (int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec,
970 },
971 #endif
972 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
973 {
974 .procname = "acpi_video_flags",
975 .data = &acpi_realmode_flags,
976 .maxlen = sizeof (unsigned long),
977 .mode = 0644,
978 .proc_handler = proc_doulongvec_minmax,
979 },
980 #endif
981 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
982 {
983 .procname = "ignore-unaligned-usertrap",
984 .data = &no_unaligned_warning,
985 .maxlen = sizeof (int),
986 .mode = 0644,
987 .proc_handler = proc_dointvec,
988 },
989 #endif
990 #ifdef CONFIG_IA64
991 {
992 .procname = "unaligned-dump-stack",
993 .data = &unaligned_dump_stack,
994 .maxlen = sizeof (int),
995 .mode = 0644,
996 .proc_handler = proc_dointvec,
997 },
998 #endif
999 #ifdef CONFIG_DETECT_HUNG_TASK
1000 {
1001 .procname = "hung_task_panic",
1002 .data = &sysctl_hung_task_panic,
1003 .maxlen = sizeof(int),
1004 .mode = 0644,
1005 .proc_handler = proc_dointvec_minmax,
1006 .extra1 = &zero,
1007 .extra2 = &one,
1008 },
1009 {
1010 .procname = "hung_task_check_count",
1011 .data = &sysctl_hung_task_check_count,
1012 .maxlen = sizeof(int),
1013 .mode = 0644,
1014 .proc_handler = proc_dointvec_minmax,
1015 .extra1 = &zero,
1016 },
1017 {
1018 .procname = "hung_task_timeout_secs",
1019 .data = &sysctl_hung_task_timeout_secs,
1020 .maxlen = sizeof(unsigned long),
1021 .mode = 0644,
1022 .proc_handler = proc_dohung_task_timeout_secs,
1023 .extra2 = &hung_task_timeout_max,
1024 },
1025 {
1026 .procname = "hung_task_warnings",
1027 .data = &sysctl_hung_task_warnings,
1028 .maxlen = sizeof(int),
1029 .mode = 0644,
1030 .proc_handler = proc_dointvec_minmax,
1031 .extra1 = &neg_one,
1032 },
1033 #endif
1034 #ifdef CONFIG_COMPAT
1035 {
1036 .procname = "compat-log",
1037 .data = &compat_log,
1038 .maxlen = sizeof (int),
1039 .mode = 0644,
1040 .proc_handler = proc_dointvec,
1041 },
1042 #endif
1043 #ifdef CONFIG_RT_MUTEXES
1044 {
1045 .procname = "max_lock_depth",
1046 .data = &max_lock_depth,
1047 .maxlen = sizeof(int),
1048 .mode = 0644,
1049 .proc_handler = proc_dointvec,
1050 },
1051 #endif
1052 {
1053 .procname = "poweroff_cmd",
1054 .data = &poweroff_cmd,
1055 .maxlen = POWEROFF_CMD_PATH_LEN,
1056 .mode = 0644,
1057 .proc_handler = proc_dostring,
1058 },
1059 #ifdef CONFIG_KEYS
1060 {
1061 .procname = "keys",
1062 .mode = 0555,
1063 .child = key_sysctls,
1064 },
1065 #endif
1066 #ifdef CONFIG_PERF_EVENTS
1067 /*
1068 * User-space scripts rely on the existence of this file
1069 * as a feature check for perf_events being enabled.
1070 *
1071 * So it's an ABI, do not remove!
1072 */
1073 {
1074 .procname = "perf_event_paranoid",
1075 .data = &sysctl_perf_event_paranoid,
1076 .maxlen = sizeof(sysctl_perf_event_paranoid),
1077 .mode = 0644,
1078 .proc_handler = proc_dointvec,
1079 },
1080 {
1081 .procname = "perf_event_mlock_kb",
1082 .data = &sysctl_perf_event_mlock,
1083 .maxlen = sizeof(sysctl_perf_event_mlock),
1084 .mode = 0644,
1085 .proc_handler = proc_dointvec,
1086 },
1087 {
1088 .procname = "perf_event_max_sample_rate",
1089 .data = &sysctl_perf_event_sample_rate,
1090 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1091 .mode = 0644,
1092 .proc_handler = perf_proc_update_handler,
1093 .extra1 = &one,
1094 },
1095 {
1096 .procname = "perf_cpu_time_max_percent",
1097 .data = &sysctl_perf_cpu_time_max_percent,
1098 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1099 .mode = 0644,
1100 .proc_handler = perf_cpu_time_max_percent_handler,
1101 .extra1 = &zero,
1102 .extra2 = &one_hundred,
1103 },
1104 #endif
1105 #ifdef CONFIG_KMEMCHECK
1106 {
1107 .procname = "kmemcheck",
1108 .data = &kmemcheck_enabled,
1109 .maxlen = sizeof(int),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec,
1112 },
1113 #endif
1114 {
1115 .procname = "panic_on_warn",
1116 .data = &panic_on_warn,
1117 .maxlen = sizeof(int),
1118 .mode = 0644,
1119 .proc_handler = proc_dointvec_minmax,
1120 .extra1 = &zero,
1121 .extra2 = &one,
1122 },
1123 { }
1124 };
1125
1126 static struct ctl_table vm_table[] = {
1127 {
1128 .procname = "overcommit_memory",
1129 .data = &sysctl_overcommit_memory,
1130 .maxlen = sizeof(sysctl_overcommit_memory),
1131 .mode = 0644,
1132 .proc_handler = proc_dointvec_minmax,
1133 .extra1 = &zero,
1134 .extra2 = &two,
1135 },
1136 {
1137 .procname = "panic_on_oom",
1138 .data = &sysctl_panic_on_oom,
1139 .maxlen = sizeof(sysctl_panic_on_oom),
1140 .mode = 0644,
1141 .proc_handler = proc_dointvec_minmax,
1142 .extra1 = &zero,
1143 .extra2 = &two,
1144 },
1145 {
1146 .procname = "oom_kill_allocating_task",
1147 .data = &sysctl_oom_kill_allocating_task,
1148 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1149 .mode = 0644,
1150 .proc_handler = proc_dointvec,
1151 },
1152 {
1153 .procname = "oom_dump_tasks",
1154 .data = &sysctl_oom_dump_tasks,
1155 .maxlen = sizeof(sysctl_oom_dump_tasks),
1156 .mode = 0644,
1157 .proc_handler = proc_dointvec,
1158 },
1159 {
1160 .procname = "overcommit_ratio",
1161 .data = &sysctl_overcommit_ratio,
1162 .maxlen = sizeof(sysctl_overcommit_ratio),
1163 .mode = 0644,
1164 .proc_handler = overcommit_ratio_handler,
1165 },
1166 {
1167 .procname = "overcommit_kbytes",
1168 .data = &sysctl_overcommit_kbytes,
1169 .maxlen = sizeof(sysctl_overcommit_kbytes),
1170 .mode = 0644,
1171 .proc_handler = overcommit_kbytes_handler,
1172 },
1173 {
1174 .procname = "page-cluster",
1175 .data = &page_cluster,
1176 .maxlen = sizeof(int),
1177 .mode = 0644,
1178 .proc_handler = proc_dointvec_minmax,
1179 .extra1 = &zero,
1180 },
1181 {
1182 .procname = "dirty_background_ratio",
1183 .data = &dirty_background_ratio,
1184 .maxlen = sizeof(dirty_background_ratio),
1185 .mode = 0644,
1186 .proc_handler = dirty_background_ratio_handler,
1187 .extra1 = &zero,
1188 .extra2 = &one_hundred,
1189 },
1190 {
1191 .procname = "dirty_background_bytes",
1192 .data = &dirty_background_bytes,
1193 .maxlen = sizeof(dirty_background_bytes),
1194 .mode = 0644,
1195 .proc_handler = dirty_background_bytes_handler,
1196 .extra1 = &one_ul,
1197 },
1198 {
1199 .procname = "dirty_ratio",
1200 .data = &vm_dirty_ratio,
1201 .maxlen = sizeof(vm_dirty_ratio),
1202 .mode = 0644,
1203 .proc_handler = dirty_ratio_handler,
1204 .extra1 = &zero,
1205 .extra2 = &one_hundred,
1206 },
1207 {
1208 .procname = "dirty_bytes",
1209 .data = &vm_dirty_bytes,
1210 .maxlen = sizeof(vm_dirty_bytes),
1211 .mode = 0644,
1212 .proc_handler = dirty_bytes_handler,
1213 .extra1 = &dirty_bytes_min,
1214 },
1215 {
1216 .procname = "dirty_writeback_centisecs",
1217 .data = &dirty_writeback_interval,
1218 .maxlen = sizeof(dirty_writeback_interval),
1219 .mode = 0644,
1220 .proc_handler = dirty_writeback_centisecs_handler,
1221 },
1222 {
1223 .procname = "dirty_expire_centisecs",
1224 .data = &dirty_expire_interval,
1225 .maxlen = sizeof(dirty_expire_interval),
1226 .mode = 0644,
1227 .proc_handler = proc_dointvec_minmax,
1228 .extra1 = &zero,
1229 },
1230 {
1231 .procname = "dirtytime_expire_seconds",
1232 .data = &dirtytime_expire_interval,
1233 .maxlen = sizeof(dirty_expire_interval),
1234 .mode = 0644,
1235 .proc_handler = dirtytime_interval_handler,
1236 .extra1 = &zero,
1237 },
1238 {
1239 .procname = "nr_pdflush_threads",
1240 .mode = 0444 /* read-only */,
1241 .proc_handler = pdflush_proc_obsolete,
1242 },
1243 {
1244 .procname = "swappiness",
1245 .data = &vm_swappiness,
1246 .maxlen = sizeof(vm_swappiness),
1247 .mode = 0644,
1248 .proc_handler = proc_dointvec_minmax,
1249 .extra1 = &zero,
1250 .extra2 = &one_hundred,
1251 },
1252 #ifdef CONFIG_HUGETLB_PAGE
1253 {
1254 .procname = "nr_hugepages",
1255 .data = NULL,
1256 .maxlen = sizeof(unsigned long),
1257 .mode = 0644,
1258 .proc_handler = hugetlb_sysctl_handler,
1259 },
1260 #ifdef CONFIG_NUMA
1261 {
1262 .procname = "nr_hugepages_mempolicy",
1263 .data = NULL,
1264 .maxlen = sizeof(unsigned long),
1265 .mode = 0644,
1266 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1267 },
1268 #endif
1269 {
1270 .procname = "hugetlb_shm_group",
1271 .data = &sysctl_hugetlb_shm_group,
1272 .maxlen = sizeof(gid_t),
1273 .mode = 0644,
1274 .proc_handler = proc_dointvec,
1275 },
1276 {
1277 .procname = "hugepages_treat_as_movable",
1278 .data = &hugepages_treat_as_movable,
1279 .maxlen = sizeof(int),
1280 .mode = 0644,
1281 .proc_handler = proc_dointvec,
1282 },
1283 {
1284 .procname = "nr_overcommit_hugepages",
1285 .data = NULL,
1286 .maxlen = sizeof(unsigned long),
1287 .mode = 0644,
1288 .proc_handler = hugetlb_overcommit_handler,
1289 },
1290 #endif
1291 {
1292 .procname = "lowmem_reserve_ratio",
1293 .data = &sysctl_lowmem_reserve_ratio,
1294 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1295 .mode = 0644,
1296 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1297 },
1298 {
1299 .procname = "drop_caches",
1300 .data = &sysctl_drop_caches,
1301 .maxlen = sizeof(int),
1302 .mode = 0644,
1303 .proc_handler = drop_caches_sysctl_handler,
1304 .extra1 = &one,
1305 .extra2 = &four,
1306 },
1307 #ifdef CONFIG_COMPACTION
1308 {
1309 .procname = "compact_memory",
1310 .data = &sysctl_compact_memory,
1311 .maxlen = sizeof(int),
1312 .mode = 0200,
1313 .proc_handler = sysctl_compaction_handler,
1314 },
1315 {
1316 .procname = "extfrag_threshold",
1317 .data = &sysctl_extfrag_threshold,
1318 .maxlen = sizeof(int),
1319 .mode = 0644,
1320 .proc_handler = sysctl_extfrag_handler,
1321 .extra1 = &min_extfrag_threshold,
1322 .extra2 = &max_extfrag_threshold,
1323 },
1324
1325 #endif /* CONFIG_COMPACTION */
1326 {
1327 .procname = "min_free_kbytes",
1328 .data = &min_free_kbytes,
1329 .maxlen = sizeof(min_free_kbytes),
1330 .mode = 0644,
1331 .proc_handler = min_free_kbytes_sysctl_handler,
1332 .extra1 = &zero,
1333 },
1334 {
1335 .procname = "percpu_pagelist_fraction",
1336 .data = &percpu_pagelist_fraction,
1337 .maxlen = sizeof(percpu_pagelist_fraction),
1338 .mode = 0644,
1339 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1340 .extra1 = &zero,
1341 },
1342 #ifdef CONFIG_MMU
1343 {
1344 .procname = "max_map_count",
1345 .data = &sysctl_max_map_count,
1346 .maxlen = sizeof(sysctl_max_map_count),
1347 .mode = 0644,
1348 .proc_handler = proc_dointvec_minmax,
1349 .extra1 = &zero,
1350 },
1351 #else
1352 {
1353 .procname = "nr_trim_pages",
1354 .data = &sysctl_nr_trim_pages,
1355 .maxlen = sizeof(sysctl_nr_trim_pages),
1356 .mode = 0644,
1357 .proc_handler = proc_dointvec_minmax,
1358 .extra1 = &zero,
1359 },
1360 #endif
1361 {
1362 .procname = "laptop_mode",
1363 .data = &laptop_mode,
1364 .maxlen = sizeof(laptop_mode),
1365 .mode = 0644,
1366 .proc_handler = proc_dointvec_jiffies,
1367 },
1368 {
1369 .procname = "block_dump",
1370 .data = &block_dump,
1371 .maxlen = sizeof(block_dump),
1372 .mode = 0644,
1373 .proc_handler = proc_dointvec,
1374 .extra1 = &zero,
1375 },
1376 {
1377 .procname = "vfs_cache_pressure",
1378 .data = &sysctl_vfs_cache_pressure,
1379 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1380 .mode = 0644,
1381 .proc_handler = proc_dointvec,
1382 .extra1 = &zero,
1383 },
1384 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1385 {
1386 .procname = "legacy_va_layout",
1387 .data = &sysctl_legacy_va_layout,
1388 .maxlen = sizeof(sysctl_legacy_va_layout),
1389 .mode = 0644,
1390 .proc_handler = proc_dointvec,
1391 .extra1 = &zero,
1392 },
1393 #endif
1394 #ifdef CONFIG_NUMA
1395 {
1396 .procname = "zone_reclaim_mode",
1397 .data = &zone_reclaim_mode,
1398 .maxlen = sizeof(zone_reclaim_mode),
1399 .mode = 0644,
1400 .proc_handler = proc_dointvec,
1401 .extra1 = &zero,
1402 },
1403 {
1404 .procname = "min_unmapped_ratio",
1405 .data = &sysctl_min_unmapped_ratio,
1406 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1407 .mode = 0644,
1408 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1409 .extra1 = &zero,
1410 .extra2 = &one_hundred,
1411 },
1412 {
1413 .procname = "min_slab_ratio",
1414 .data = &sysctl_min_slab_ratio,
1415 .maxlen = sizeof(sysctl_min_slab_ratio),
1416 .mode = 0644,
1417 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1418 .extra1 = &zero,
1419 .extra2 = &one_hundred,
1420 },
1421 #endif
1422 #ifdef CONFIG_SMP
1423 {
1424 .procname = "stat_interval",
1425 .data = &sysctl_stat_interval,
1426 .maxlen = sizeof(sysctl_stat_interval),
1427 .mode = 0644,
1428 .proc_handler = proc_dointvec_jiffies,
1429 },
1430 #endif
1431 #ifdef CONFIG_MMU
1432 {
1433 .procname = "mmap_min_addr",
1434 .data = &dac_mmap_min_addr,
1435 .maxlen = sizeof(unsigned long),
1436 .mode = 0644,
1437 .proc_handler = mmap_min_addr_handler,
1438 },
1439 #endif
1440 #ifdef CONFIG_NUMA
1441 {
1442 .procname = "numa_zonelist_order",
1443 .data = &numa_zonelist_order,
1444 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1445 .mode = 0644,
1446 .proc_handler = numa_zonelist_order_handler,
1447 },
1448 #endif
1449 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1450 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1451 {
1452 .procname = "vdso_enabled",
1453 #ifdef CONFIG_X86_32
1454 .data = &vdso32_enabled,
1455 .maxlen = sizeof(vdso32_enabled),
1456 #else
1457 .data = &vdso_enabled,
1458 .maxlen = sizeof(vdso_enabled),
1459 #endif
1460 .mode = 0644,
1461 .proc_handler = proc_dointvec,
1462 .extra1 = &zero,
1463 },
1464 #endif
1465 #ifdef CONFIG_HIGHMEM
1466 {
1467 .procname = "highmem_is_dirtyable",
1468 .data = &vm_highmem_is_dirtyable,
1469 .maxlen = sizeof(vm_highmem_is_dirtyable),
1470 .mode = 0644,
1471 .proc_handler = proc_dointvec_minmax,
1472 .extra1 = &zero,
1473 .extra2 = &one,
1474 },
1475 #endif
1476 #ifdef CONFIG_MEMORY_FAILURE
1477 {
1478 .procname = "memory_failure_early_kill",
1479 .data = &sysctl_memory_failure_early_kill,
1480 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1481 .mode = 0644,
1482 .proc_handler = proc_dointvec_minmax,
1483 .extra1 = &zero,
1484 .extra2 = &one,
1485 },
1486 {
1487 .procname = "memory_failure_recovery",
1488 .data = &sysctl_memory_failure_recovery,
1489 .maxlen = sizeof(sysctl_memory_failure_recovery),
1490 .mode = 0644,
1491 .proc_handler = proc_dointvec_minmax,
1492 .extra1 = &zero,
1493 .extra2 = &one,
1494 },
1495 #endif
1496 {
1497 .procname = "user_reserve_kbytes",
1498 .data = &sysctl_user_reserve_kbytes,
1499 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1500 .mode = 0644,
1501 .proc_handler = proc_doulongvec_minmax,
1502 },
1503 {
1504 .procname = "admin_reserve_kbytes",
1505 .data = &sysctl_admin_reserve_kbytes,
1506 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1507 .mode = 0644,
1508 .proc_handler = proc_doulongvec_minmax,
1509 },
1510 { }
1511 };
1512
1513 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1514 static struct ctl_table binfmt_misc_table[] = {
1515 { }
1516 };
1517 #endif
1518
1519 static struct ctl_table fs_table[] = {
1520 {
1521 .procname = "inode-nr",
1522 .data = &inodes_stat,
1523 .maxlen = 2*sizeof(long),
1524 .mode = 0444,
1525 .proc_handler = proc_nr_inodes,
1526 },
1527 {
1528 .procname = "inode-state",
1529 .data = &inodes_stat,
1530 .maxlen = 7*sizeof(long),
1531 .mode = 0444,
1532 .proc_handler = proc_nr_inodes,
1533 },
1534 {
1535 .procname = "file-nr",
1536 .data = &files_stat,
1537 .maxlen = sizeof(files_stat),
1538 .mode = 0444,
1539 .proc_handler = proc_nr_files,
1540 },
1541 {
1542 .procname = "file-max",
1543 .data = &files_stat.max_files,
1544 .maxlen = sizeof(files_stat.max_files),
1545 .mode = 0644,
1546 .proc_handler = proc_doulongvec_minmax,
1547 },
1548 {
1549 .procname = "nr_open",
1550 .data = &sysctl_nr_open,
1551 .maxlen = sizeof(int),
1552 .mode = 0644,
1553 .proc_handler = proc_dointvec_minmax,
1554 .extra1 = &sysctl_nr_open_min,
1555 .extra2 = &sysctl_nr_open_max,
1556 },
1557 {
1558 .procname = "dentry-state",
1559 .data = &dentry_stat,
1560 .maxlen = 6*sizeof(long),
1561 .mode = 0444,
1562 .proc_handler = proc_nr_dentry,
1563 },
1564 {
1565 .procname = "overflowuid",
1566 .data = &fs_overflowuid,
1567 .maxlen = sizeof(int),
1568 .mode = 0644,
1569 .proc_handler = proc_dointvec_minmax,
1570 .extra1 = &minolduid,
1571 .extra2 = &maxolduid,
1572 },
1573 {
1574 .procname = "overflowgid",
1575 .data = &fs_overflowgid,
1576 .maxlen = sizeof(int),
1577 .mode = 0644,
1578 .proc_handler = proc_dointvec_minmax,
1579 .extra1 = &minolduid,
1580 .extra2 = &maxolduid,
1581 },
1582 #ifdef CONFIG_FILE_LOCKING
1583 {
1584 .procname = "leases-enable",
1585 .data = &leases_enable,
1586 .maxlen = sizeof(int),
1587 .mode = 0644,
1588 .proc_handler = proc_dointvec,
1589 },
1590 #endif
1591 #ifdef CONFIG_DNOTIFY
1592 {
1593 .procname = "dir-notify-enable",
1594 .data = &dir_notify_enable,
1595 .maxlen = sizeof(int),
1596 .mode = 0644,
1597 .proc_handler = proc_dointvec,
1598 },
1599 #endif
1600 #ifdef CONFIG_MMU
1601 #ifdef CONFIG_FILE_LOCKING
1602 {
1603 .procname = "lease-break-time",
1604 .data = &lease_break_time,
1605 .maxlen = sizeof(int),
1606 .mode = 0644,
1607 .proc_handler = proc_dointvec,
1608 },
1609 #endif
1610 #ifdef CONFIG_AIO
1611 {
1612 .procname = "aio-nr",
1613 .data = &aio_nr,
1614 .maxlen = sizeof(aio_nr),
1615 .mode = 0444,
1616 .proc_handler = proc_doulongvec_minmax,
1617 },
1618 {
1619 .procname = "aio-max-nr",
1620 .data = &aio_max_nr,
1621 .maxlen = sizeof(aio_max_nr),
1622 .mode = 0644,
1623 .proc_handler = proc_doulongvec_minmax,
1624 },
1625 #endif /* CONFIG_AIO */
1626 #ifdef CONFIG_INOTIFY_USER
1627 {
1628 .procname = "inotify",
1629 .mode = 0555,
1630 .child = inotify_table,
1631 },
1632 #endif
1633 #ifdef CONFIG_EPOLL
1634 {
1635 .procname = "epoll",
1636 .mode = 0555,
1637 .child = epoll_table,
1638 },
1639 #endif
1640 #endif
1641 {
1642 .procname = "protected_symlinks",
1643 .data = &sysctl_protected_symlinks,
1644 .maxlen = sizeof(int),
1645 .mode = 0600,
1646 .proc_handler = proc_dointvec_minmax,
1647 .extra1 = &zero,
1648 .extra2 = &one,
1649 },
1650 {
1651 .procname = "protected_hardlinks",
1652 .data = &sysctl_protected_hardlinks,
1653 .maxlen = sizeof(int),
1654 .mode = 0600,
1655 .proc_handler = proc_dointvec_minmax,
1656 .extra1 = &zero,
1657 .extra2 = &one,
1658 },
1659 {
1660 .procname = "suid_dumpable",
1661 .data = &suid_dumpable,
1662 .maxlen = sizeof(int),
1663 .mode = 0644,
1664 .proc_handler = proc_dointvec_minmax_coredump,
1665 .extra1 = &zero,
1666 .extra2 = &two,
1667 },
1668 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1669 {
1670 .procname = "binfmt_misc",
1671 .mode = 0555,
1672 .child = binfmt_misc_table,
1673 },
1674 #endif
1675 {
1676 .procname = "pipe-max-size",
1677 .data = &pipe_max_size,
1678 .maxlen = sizeof(int),
1679 .mode = 0644,
1680 .proc_handler = &pipe_proc_fn,
1681 .extra1 = &pipe_min_size,
1682 },
1683 { }
1684 };
1685
1686 static struct ctl_table debug_table[] = {
1687 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1688 {
1689 .procname = "exception-trace",
1690 .data = &show_unhandled_signals,
1691 .maxlen = sizeof(int),
1692 .mode = 0644,
1693 .proc_handler = proc_dointvec
1694 },
1695 #endif
1696 #if defined(CONFIG_OPTPROBES)
1697 {
1698 .procname = "kprobes-optimization",
1699 .data = &sysctl_kprobes_optimization,
1700 .maxlen = sizeof(int),
1701 .mode = 0644,
1702 .proc_handler = proc_kprobes_optimization_handler,
1703 .extra1 = &zero,
1704 .extra2 = &one,
1705 },
1706 #endif
1707 { }
1708 };
1709
1710 static struct ctl_table dev_table[] = {
1711 { }
1712 };
1713
1714 int __init sysctl_init(void)
1715 {
1716 struct ctl_table_header *hdr;
1717
1718 hdr = register_sysctl_table(sysctl_base_table);
1719 kmemleak_not_leak(hdr);
1720 return 0;
1721 }
1722
1723 #endif /* CONFIG_SYSCTL */
1724
1725 /*
1726 * /proc/sys support
1727 */
1728
1729 #ifdef CONFIG_PROC_SYSCTL
1730
1731 static int _proc_do_string(char *data, int maxlen, int write,
1732 char __user *buffer,
1733 size_t *lenp, loff_t *ppos)
1734 {
1735 size_t len;
1736 char __user *p;
1737 char c;
1738
1739 if (!data || !maxlen || !*lenp) {
1740 *lenp = 0;
1741 return 0;
1742 }
1743
1744 if (write) {
1745 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1746 /* Only continue writes not past the end of buffer. */
1747 len = strlen(data);
1748 if (len > maxlen - 1)
1749 len = maxlen - 1;
1750
1751 if (*ppos > len)
1752 return 0;
1753 len = *ppos;
1754 } else {
1755 /* Start writing from beginning of buffer. */
1756 len = 0;
1757 }
1758
1759 *ppos += *lenp;
1760 p = buffer;
1761 while ((p - buffer) < *lenp && len < maxlen - 1) {
1762 if (get_user(c, p++))
1763 return -EFAULT;
1764 if (c == 0 || c == '\n')
1765 break;
1766 data[len++] = c;
1767 }
1768 data[len] = 0;
1769 } else {
1770 len = strlen(data);
1771 if (len > maxlen)
1772 len = maxlen;
1773
1774 if (*ppos > len) {
1775 *lenp = 0;
1776 return 0;
1777 }
1778
1779 data += *ppos;
1780 len -= *ppos;
1781
1782 if (len > *lenp)
1783 len = *lenp;
1784 if (len)
1785 if (copy_to_user(buffer, data, len))
1786 return -EFAULT;
1787 if (len < *lenp) {
1788 if (put_user('\n', buffer + len))
1789 return -EFAULT;
1790 len++;
1791 }
1792 *lenp = len;
1793 *ppos += len;
1794 }
1795 return 0;
1796 }
1797
1798 static void warn_sysctl_write(struct ctl_table *table)
1799 {
1800 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1801 "This will not be supported in the future. To silence this\n"
1802 "warning, set kernel.sysctl_writes_strict = -1\n",
1803 current->comm, table->procname);
1804 }
1805
1806 /**
1807 * proc_dostring - read a string sysctl
1808 * @table: the sysctl table
1809 * @write: %TRUE if this is a write to the sysctl file
1810 * @buffer: the user buffer
1811 * @lenp: the size of the user buffer
1812 * @ppos: file position
1813 *
1814 * Reads/writes a string from/to the user buffer. If the kernel
1815 * buffer provided is not large enough to hold the string, the
1816 * string is truncated. The copied string is %NULL-terminated.
1817 * If the string is being read by the user process, it is copied
1818 * and a newline '\n' is added. It is truncated if the buffer is
1819 * not large enough.
1820 *
1821 * Returns 0 on success.
1822 */
1823 int proc_dostring(struct ctl_table *table, int write,
1824 void __user *buffer, size_t *lenp, loff_t *ppos)
1825 {
1826 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1827 warn_sysctl_write(table);
1828
1829 return _proc_do_string((char *)(table->data), table->maxlen, write,
1830 (char __user *)buffer, lenp, ppos);
1831 }
1832
1833 static size_t proc_skip_spaces(char **buf)
1834 {
1835 size_t ret;
1836 char *tmp = skip_spaces(*buf);
1837 ret = tmp - *buf;
1838 *buf = tmp;
1839 return ret;
1840 }
1841
1842 static void proc_skip_char(char **buf, size_t *size, const char v)
1843 {
1844 while (*size) {
1845 if (**buf != v)
1846 break;
1847 (*size)--;
1848 (*buf)++;
1849 }
1850 }
1851
1852 #define TMPBUFLEN 22
1853 /**
1854 * proc_get_long - reads an ASCII formatted integer from a user buffer
1855 *
1856 * @buf: a kernel buffer
1857 * @size: size of the kernel buffer
1858 * @val: this is where the number will be stored
1859 * @neg: set to %TRUE if number is negative
1860 * @perm_tr: a vector which contains the allowed trailers
1861 * @perm_tr_len: size of the perm_tr vector
1862 * @tr: pointer to store the trailer character
1863 *
1864 * In case of success %0 is returned and @buf and @size are updated with
1865 * the amount of bytes read. If @tr is non-NULL and a trailing
1866 * character exists (size is non-zero after returning from this
1867 * function), @tr is updated with the trailing character.
1868 */
1869 static int proc_get_long(char **buf, size_t *size,
1870 unsigned long *val, bool *neg,
1871 const char *perm_tr, unsigned perm_tr_len, char *tr)
1872 {
1873 int len;
1874 char *p, tmp[TMPBUFLEN];
1875
1876 if (!*size)
1877 return -EINVAL;
1878
1879 len = *size;
1880 if (len > TMPBUFLEN - 1)
1881 len = TMPBUFLEN - 1;
1882
1883 memcpy(tmp, *buf, len);
1884
1885 tmp[len] = 0;
1886 p = tmp;
1887 if (*p == '-' && *size > 1) {
1888 *neg = true;
1889 p++;
1890 } else
1891 *neg = false;
1892 if (!isdigit(*p))
1893 return -EINVAL;
1894
1895 *val = simple_strtoul(p, &p, 0);
1896
1897 len = p - tmp;
1898
1899 /* We don't know if the next char is whitespace thus we may accept
1900 * invalid integers (e.g. 1234...a) or two integers instead of one
1901 * (e.g. 123...1). So lets not allow such large numbers. */
1902 if (len == TMPBUFLEN - 1)
1903 return -EINVAL;
1904
1905 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1906 return -EINVAL;
1907
1908 if (tr && (len < *size))
1909 *tr = *p;
1910
1911 *buf += len;
1912 *size -= len;
1913
1914 return 0;
1915 }
1916
1917 /**
1918 * proc_put_long - converts an integer to a decimal ASCII formatted string
1919 *
1920 * @buf: the user buffer
1921 * @size: the size of the user buffer
1922 * @val: the integer to be converted
1923 * @neg: sign of the number, %TRUE for negative
1924 *
1925 * In case of success %0 is returned and @buf and @size are updated with
1926 * the amount of bytes written.
1927 */
1928 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1929 bool neg)
1930 {
1931 int len;
1932 char tmp[TMPBUFLEN], *p = tmp;
1933
1934 sprintf(p, "%s%lu", neg ? "-" : "", val);
1935 len = strlen(tmp);
1936 if (len > *size)
1937 len = *size;
1938 if (copy_to_user(*buf, tmp, len))
1939 return -EFAULT;
1940 *size -= len;
1941 *buf += len;
1942 return 0;
1943 }
1944 #undef TMPBUFLEN
1945
1946 static int proc_put_char(void __user **buf, size_t *size, char c)
1947 {
1948 if (*size) {
1949 char __user **buffer = (char __user **)buf;
1950 if (put_user(c, *buffer))
1951 return -EFAULT;
1952 (*size)--, (*buffer)++;
1953 *buf = *buffer;
1954 }
1955 return 0;
1956 }
1957
1958 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1959 int *valp,
1960 int write, void *data)
1961 {
1962 if (write) {
1963 *valp = *negp ? -*lvalp : *lvalp;
1964 } else {
1965 int val = *valp;
1966 if (val < 0) {
1967 *negp = true;
1968 *lvalp = (unsigned long)-val;
1969 } else {
1970 *negp = false;
1971 *lvalp = (unsigned long)val;
1972 }
1973 }
1974 return 0;
1975 }
1976
1977 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1978
1979 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1980 int write, void __user *buffer,
1981 size_t *lenp, loff_t *ppos,
1982 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1983 int write, void *data),
1984 void *data)
1985 {
1986 int *i, vleft, first = 1, err = 0;
1987 unsigned long page = 0;
1988 size_t left;
1989 char *kbuf;
1990
1991 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1992 *lenp = 0;
1993 return 0;
1994 }
1995
1996 i = (int *) tbl_data;
1997 vleft = table->maxlen / sizeof(*i);
1998 left = *lenp;
1999
2000 if (!conv)
2001 conv = do_proc_dointvec_conv;
2002
2003 if (write) {
2004 if (*ppos) {
2005 switch (sysctl_writes_strict) {
2006 case SYSCTL_WRITES_STRICT:
2007 goto out;
2008 case SYSCTL_WRITES_WARN:
2009 warn_sysctl_write(table);
2010 break;
2011 default:
2012 break;
2013 }
2014 }
2015
2016 if (left > PAGE_SIZE - 1)
2017 left = PAGE_SIZE - 1;
2018 page = __get_free_page(GFP_TEMPORARY);
2019 kbuf = (char *) page;
2020 if (!kbuf)
2021 return -ENOMEM;
2022 if (copy_from_user(kbuf, buffer, left)) {
2023 err = -EFAULT;
2024 goto free;
2025 }
2026 kbuf[left] = 0;
2027 }
2028
2029 for (; left && vleft--; i++, first=0) {
2030 unsigned long lval;
2031 bool neg;
2032
2033 if (write) {
2034 left -= proc_skip_spaces(&kbuf);
2035
2036 if (!left)
2037 break;
2038 err = proc_get_long(&kbuf, &left, &lval, &neg,
2039 proc_wspace_sep,
2040 sizeof(proc_wspace_sep), NULL);
2041 if (err)
2042 break;
2043 if (conv(&neg, &lval, i, 1, data)) {
2044 err = -EINVAL;
2045 break;
2046 }
2047 } else {
2048 if (conv(&neg, &lval, i, 0, data)) {
2049 err = -EINVAL;
2050 break;
2051 }
2052 if (!first)
2053 err = proc_put_char(&buffer, &left, '\t');
2054 if (err)
2055 break;
2056 err = proc_put_long(&buffer, &left, lval, neg);
2057 if (err)
2058 break;
2059 }
2060 }
2061
2062 if (!write && !first && left && !err)
2063 err = proc_put_char(&buffer, &left, '\n');
2064 if (write && !err && left)
2065 left -= proc_skip_spaces(&kbuf);
2066 free:
2067 if (write) {
2068 free_page(page);
2069 if (first)
2070 return err ? : -EINVAL;
2071 }
2072 *lenp -= left;
2073 out:
2074 *ppos += *lenp;
2075 return err;
2076 }
2077
2078 static int do_proc_dointvec(struct ctl_table *table, int write,
2079 void __user *buffer, size_t *lenp, loff_t *ppos,
2080 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2081 int write, void *data),
2082 void *data)
2083 {
2084 return __do_proc_dointvec(table->data, table, write,
2085 buffer, lenp, ppos, conv, data);
2086 }
2087
2088 /**
2089 * proc_dointvec - read a vector of integers
2090 * @table: the sysctl table
2091 * @write: %TRUE if this is a write to the sysctl file
2092 * @buffer: the user buffer
2093 * @lenp: the size of the user buffer
2094 * @ppos: file position
2095 *
2096 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2097 * values from/to the user buffer, treated as an ASCII string.
2098 *
2099 * Returns 0 on success.
2100 */
2101 int proc_dointvec(struct ctl_table *table, int write,
2102 void __user *buffer, size_t *lenp, loff_t *ppos)
2103 {
2104 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2105 NULL,NULL);
2106 }
2107
2108 /*
2109 * Taint values can only be increased
2110 * This means we can safely use a temporary.
2111 */
2112 static int proc_taint(struct ctl_table *table, int write,
2113 void __user *buffer, size_t *lenp, loff_t *ppos)
2114 {
2115 struct ctl_table t;
2116 unsigned long tmptaint = get_taint();
2117 int err;
2118
2119 if (write && !capable(CAP_SYS_ADMIN))
2120 return -EPERM;
2121
2122 t = *table;
2123 t.data = &tmptaint;
2124 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2125 if (err < 0)
2126 return err;
2127
2128 if (write) {
2129 /*
2130 * Poor man's atomic or. Not worth adding a primitive
2131 * to everyone's atomic.h for this
2132 */
2133 int i;
2134 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2135 if ((tmptaint >> i) & 1)
2136 add_taint(i, LOCKDEP_STILL_OK);
2137 }
2138 }
2139
2140 return err;
2141 }
2142
2143 #ifdef CONFIG_PRINTK
2144 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2145 void __user *buffer, size_t *lenp, loff_t *ppos)
2146 {
2147 if (write && !capable(CAP_SYS_ADMIN))
2148 return -EPERM;
2149
2150 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2151 }
2152 #endif
2153
2154 struct do_proc_dointvec_minmax_conv_param {
2155 int *min;
2156 int *max;
2157 };
2158
2159 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2160 int *valp,
2161 int write, void *data)
2162 {
2163 struct do_proc_dointvec_minmax_conv_param *param = data;
2164 if (write) {
2165 int val = *negp ? -*lvalp : *lvalp;
2166 if ((param->min && *param->min > val) ||
2167 (param->max && *param->max < val))
2168 return -EINVAL;
2169 *valp = val;
2170 } else {
2171 int val = *valp;
2172 if (val < 0) {
2173 *negp = true;
2174 *lvalp = (unsigned long)-val;
2175 } else {
2176 *negp = false;
2177 *lvalp = (unsigned long)val;
2178 }
2179 }
2180 return 0;
2181 }
2182
2183 /**
2184 * proc_dointvec_minmax - read a vector of integers with min/max values
2185 * @table: the sysctl table
2186 * @write: %TRUE if this is a write to the sysctl file
2187 * @buffer: the user buffer
2188 * @lenp: the size of the user buffer
2189 * @ppos: file position
2190 *
2191 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2192 * values from/to the user buffer, treated as an ASCII string.
2193 *
2194 * This routine will ensure the values are within the range specified by
2195 * table->extra1 (min) and table->extra2 (max).
2196 *
2197 * Returns 0 on success.
2198 */
2199 int proc_dointvec_minmax(struct ctl_table *table, int write,
2200 void __user *buffer, size_t *lenp, loff_t *ppos)
2201 {
2202 struct do_proc_dointvec_minmax_conv_param param = {
2203 .min = (int *) table->extra1,
2204 .max = (int *) table->extra2,
2205 };
2206 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2207 do_proc_dointvec_minmax_conv, &param);
2208 }
2209
2210 static void validate_coredump_safety(void)
2211 {
2212 #ifdef CONFIG_COREDUMP
2213 if (suid_dumpable == SUID_DUMP_ROOT &&
2214 core_pattern[0] != '/' && core_pattern[0] != '|') {
2215 printk(KERN_WARNING "Unsafe core_pattern used with "\
2216 "suid_dumpable=2. Pipe handler or fully qualified "\
2217 "core dump path required.\n");
2218 }
2219 #endif
2220 }
2221
2222 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2223 void __user *buffer, size_t *lenp, loff_t *ppos)
2224 {
2225 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2226 if (!error)
2227 validate_coredump_safety();
2228 return error;
2229 }
2230
2231 #ifdef CONFIG_COREDUMP
2232 static int proc_dostring_coredump(struct ctl_table *table, int write,
2233 void __user *buffer, size_t *lenp, loff_t *ppos)
2234 {
2235 int error = proc_dostring(table, write, buffer, lenp, ppos);
2236 if (!error)
2237 validate_coredump_safety();
2238 return error;
2239 }
2240 #endif
2241
2242 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2243 void __user *buffer,
2244 size_t *lenp, loff_t *ppos,
2245 unsigned long convmul,
2246 unsigned long convdiv)
2247 {
2248 unsigned long *i, *min, *max;
2249 int vleft, first = 1, err = 0;
2250 unsigned long page = 0;
2251 size_t left;
2252 char *kbuf;
2253
2254 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2255 *lenp = 0;
2256 return 0;
2257 }
2258
2259 i = (unsigned long *) data;
2260 min = (unsigned long *) table->extra1;
2261 max = (unsigned long *) table->extra2;
2262 vleft = table->maxlen / sizeof(unsigned long);
2263 left = *lenp;
2264
2265 if (write) {
2266 if (*ppos) {
2267 switch (sysctl_writes_strict) {
2268 case SYSCTL_WRITES_STRICT:
2269 goto out;
2270 case SYSCTL_WRITES_WARN:
2271 warn_sysctl_write(table);
2272 break;
2273 default:
2274 break;
2275 }
2276 }
2277
2278 if (left > PAGE_SIZE - 1)
2279 left = PAGE_SIZE - 1;
2280 page = __get_free_page(GFP_TEMPORARY);
2281 kbuf = (char *) page;
2282 if (!kbuf)
2283 return -ENOMEM;
2284 if (copy_from_user(kbuf, buffer, left)) {
2285 err = -EFAULT;
2286 goto free;
2287 }
2288 kbuf[left] = 0;
2289 }
2290
2291 for (; left && vleft--; i++, first = 0) {
2292 unsigned long val;
2293
2294 if (write) {
2295 bool neg;
2296
2297 left -= proc_skip_spaces(&kbuf);
2298
2299 err = proc_get_long(&kbuf, &left, &val, &neg,
2300 proc_wspace_sep,
2301 sizeof(proc_wspace_sep), NULL);
2302 if (err)
2303 break;
2304 if (neg)
2305 continue;
2306 if ((min && val < *min) || (max && val > *max))
2307 continue;
2308 *i = val;
2309 } else {
2310 val = convdiv * (*i) / convmul;
2311 if (!first) {
2312 err = proc_put_char(&buffer, &left, '\t');
2313 if (err)
2314 break;
2315 }
2316 err = proc_put_long(&buffer, &left, val, false);
2317 if (err)
2318 break;
2319 }
2320 }
2321
2322 if (!write && !first && left && !err)
2323 err = proc_put_char(&buffer, &left, '\n');
2324 if (write && !err)
2325 left -= proc_skip_spaces(&kbuf);
2326 free:
2327 if (write) {
2328 free_page(page);
2329 if (first)
2330 return err ? : -EINVAL;
2331 }
2332 *lenp -= left;
2333 out:
2334 *ppos += *lenp;
2335 return err;
2336 }
2337
2338 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2339 void __user *buffer,
2340 size_t *lenp, loff_t *ppos,
2341 unsigned long convmul,
2342 unsigned long convdiv)
2343 {
2344 return __do_proc_doulongvec_minmax(table->data, table, write,
2345 buffer, lenp, ppos, convmul, convdiv);
2346 }
2347
2348 /**
2349 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2350 * @table: the sysctl table
2351 * @write: %TRUE if this is a write to the sysctl file
2352 * @buffer: the user buffer
2353 * @lenp: the size of the user buffer
2354 * @ppos: file position
2355 *
2356 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2357 * values from/to the user buffer, treated as an ASCII string.
2358 *
2359 * This routine will ensure the values are within the range specified by
2360 * table->extra1 (min) and table->extra2 (max).
2361 *
2362 * Returns 0 on success.
2363 */
2364 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2365 void __user *buffer, size_t *lenp, loff_t *ppos)
2366 {
2367 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2368 }
2369
2370 /**
2371 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2372 * @table: the sysctl table
2373 * @write: %TRUE if this is a write to the sysctl file
2374 * @buffer: the user buffer
2375 * @lenp: the size of the user buffer
2376 * @ppos: file position
2377 *
2378 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2379 * values from/to the user buffer, treated as an ASCII string. The values
2380 * are treated as milliseconds, and converted to jiffies when they are stored.
2381 *
2382 * This routine will ensure the values are within the range specified by
2383 * table->extra1 (min) and table->extra2 (max).
2384 *
2385 * Returns 0 on success.
2386 */
2387 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2388 void __user *buffer,
2389 size_t *lenp, loff_t *ppos)
2390 {
2391 return do_proc_doulongvec_minmax(table, write, buffer,
2392 lenp, ppos, HZ, 1000l);
2393 }
2394
2395
2396 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2397 int *valp,
2398 int write, void *data)
2399 {
2400 if (write) {
2401 if (*lvalp > LONG_MAX / HZ)
2402 return 1;
2403 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2404 } else {
2405 int val = *valp;
2406 unsigned long lval;
2407 if (val < 0) {
2408 *negp = true;
2409 lval = (unsigned long)-val;
2410 } else {
2411 *negp = false;
2412 lval = (unsigned long)val;
2413 }
2414 *lvalp = lval / HZ;
2415 }
2416 return 0;
2417 }
2418
2419 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2420 int *valp,
2421 int write, void *data)
2422 {
2423 if (write) {
2424 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2425 return 1;
2426 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2427 } else {
2428 int val = *valp;
2429 unsigned long lval;
2430 if (val < 0) {
2431 *negp = true;
2432 lval = (unsigned long)-val;
2433 } else {
2434 *negp = false;
2435 lval = (unsigned long)val;
2436 }
2437 *lvalp = jiffies_to_clock_t(lval);
2438 }
2439 return 0;
2440 }
2441
2442 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2443 int *valp,
2444 int write, void *data)
2445 {
2446 if (write) {
2447 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2448
2449 if (jif > INT_MAX)
2450 return 1;
2451 *valp = (int)jif;
2452 } else {
2453 int val = *valp;
2454 unsigned long lval;
2455 if (val < 0) {
2456 *negp = true;
2457 lval = (unsigned long)-val;
2458 } else {
2459 *negp = false;
2460 lval = (unsigned long)val;
2461 }
2462 *lvalp = jiffies_to_msecs(lval);
2463 }
2464 return 0;
2465 }
2466
2467 /**
2468 * proc_dointvec_jiffies - read a vector of integers as seconds
2469 * @table: the sysctl table
2470 * @write: %TRUE if this is a write to the sysctl file
2471 * @buffer: the user buffer
2472 * @lenp: the size of the user buffer
2473 * @ppos: file position
2474 *
2475 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2476 * values from/to the user buffer, treated as an ASCII string.
2477 * The values read are assumed to be in seconds, and are converted into
2478 * jiffies.
2479 *
2480 * Returns 0 on success.
2481 */
2482 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2483 void __user *buffer, size_t *lenp, loff_t *ppos)
2484 {
2485 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2486 do_proc_dointvec_jiffies_conv,NULL);
2487 }
2488
2489 /**
2490 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2491 * @table: the sysctl table
2492 * @write: %TRUE if this is a write to the sysctl file
2493 * @buffer: the user buffer
2494 * @lenp: the size of the user buffer
2495 * @ppos: pointer to the file position
2496 *
2497 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2498 * values from/to the user buffer, treated as an ASCII string.
2499 * The values read are assumed to be in 1/USER_HZ seconds, and
2500 * are converted into jiffies.
2501 *
2502 * Returns 0 on success.
2503 */
2504 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2505 void __user *buffer, size_t *lenp, loff_t *ppos)
2506 {
2507 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2508 do_proc_dointvec_userhz_jiffies_conv,NULL);
2509 }
2510
2511 /**
2512 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2513 * @table: the sysctl table
2514 * @write: %TRUE if this is a write to the sysctl file
2515 * @buffer: the user buffer
2516 * @lenp: the size of the user buffer
2517 * @ppos: file position
2518 * @ppos: the current position in the file
2519 *
2520 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2521 * values from/to the user buffer, treated as an ASCII string.
2522 * The values read are assumed to be in 1/1000 seconds, and
2523 * are converted into jiffies.
2524 *
2525 * Returns 0 on success.
2526 */
2527 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2528 void __user *buffer, size_t *lenp, loff_t *ppos)
2529 {
2530 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2531 do_proc_dointvec_ms_jiffies_conv, NULL);
2532 }
2533
2534 static int proc_do_cad_pid(struct ctl_table *table, int write,
2535 void __user *buffer, size_t *lenp, loff_t *ppos)
2536 {
2537 struct pid *new_pid;
2538 pid_t tmp;
2539 int r;
2540
2541 tmp = pid_vnr(cad_pid);
2542
2543 r = __do_proc_dointvec(&tmp, table, write, buffer,
2544 lenp, ppos, NULL, NULL);
2545 if (r || !write)
2546 return r;
2547
2548 new_pid = find_get_pid(tmp);
2549 if (!new_pid)
2550 return -ESRCH;
2551
2552 put_pid(xchg(&cad_pid, new_pid));
2553 return 0;
2554 }
2555
2556 /**
2557 * proc_do_large_bitmap - read/write from/to a large bitmap
2558 * @table: the sysctl table
2559 * @write: %TRUE if this is a write to the sysctl file
2560 * @buffer: the user buffer
2561 * @lenp: the size of the user buffer
2562 * @ppos: file position
2563 *
2564 * The bitmap is stored at table->data and the bitmap length (in bits)
2565 * in table->maxlen.
2566 *
2567 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2568 * large bitmaps may be represented in a compact manner. Writing into
2569 * the file will clear the bitmap then update it with the given input.
2570 *
2571 * Returns 0 on success.
2572 */
2573 int proc_do_large_bitmap(struct ctl_table *table, int write,
2574 void __user *buffer, size_t *lenp, loff_t *ppos)
2575 {
2576 int err = 0;
2577 bool first = 1;
2578 size_t left = *lenp;
2579 unsigned long bitmap_len = table->maxlen;
2580 unsigned long *bitmap = *(unsigned long **) table->data;
2581 unsigned long *tmp_bitmap = NULL;
2582 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2583
2584 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2585 *lenp = 0;
2586 return 0;
2587 }
2588
2589 if (write) {
2590 unsigned long page = 0;
2591 char *kbuf;
2592
2593 if (left > PAGE_SIZE - 1)
2594 left = PAGE_SIZE - 1;
2595
2596 page = __get_free_page(GFP_TEMPORARY);
2597 kbuf = (char *) page;
2598 if (!kbuf)
2599 return -ENOMEM;
2600 if (copy_from_user(kbuf, buffer, left)) {
2601 free_page(page);
2602 return -EFAULT;
2603 }
2604 kbuf[left] = 0;
2605
2606 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2607 GFP_KERNEL);
2608 if (!tmp_bitmap) {
2609 free_page(page);
2610 return -ENOMEM;
2611 }
2612 proc_skip_char(&kbuf, &left, '\n');
2613 while (!err && left) {
2614 unsigned long val_a, val_b;
2615 bool neg;
2616
2617 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2618 sizeof(tr_a), &c);
2619 if (err)
2620 break;
2621 if (val_a >= bitmap_len || neg) {
2622 err = -EINVAL;
2623 break;
2624 }
2625
2626 val_b = val_a;
2627 if (left) {
2628 kbuf++;
2629 left--;
2630 }
2631
2632 if (c == '-') {
2633 err = proc_get_long(&kbuf, &left, &val_b,
2634 &neg, tr_b, sizeof(tr_b),
2635 &c);
2636 if (err)
2637 break;
2638 if (val_b >= bitmap_len || neg ||
2639 val_a > val_b) {
2640 err = -EINVAL;
2641 break;
2642 }
2643 if (left) {
2644 kbuf++;
2645 left--;
2646 }
2647 }
2648
2649 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2650 first = 0;
2651 proc_skip_char(&kbuf, &left, '\n');
2652 }
2653 free_page(page);
2654 } else {
2655 unsigned long bit_a, bit_b = 0;
2656
2657 while (left) {
2658 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2659 if (bit_a >= bitmap_len)
2660 break;
2661 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2662 bit_a + 1) - 1;
2663
2664 if (!first) {
2665 err = proc_put_char(&buffer, &left, ',');
2666 if (err)
2667 break;
2668 }
2669 err = proc_put_long(&buffer, &left, bit_a, false);
2670 if (err)
2671 break;
2672 if (bit_a != bit_b) {
2673 err = proc_put_char(&buffer, &left, '-');
2674 if (err)
2675 break;
2676 err = proc_put_long(&buffer, &left, bit_b, false);
2677 if (err)
2678 break;
2679 }
2680
2681 first = 0; bit_b++;
2682 }
2683 if (!err)
2684 err = proc_put_char(&buffer, &left, '\n');
2685 }
2686
2687 if (!err) {
2688 if (write) {
2689 if (*ppos)
2690 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2691 else
2692 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2693 }
2694 kfree(tmp_bitmap);
2695 *lenp -= left;
2696 *ppos += *lenp;
2697 return 0;
2698 } else {
2699 kfree(tmp_bitmap);
2700 return err;
2701 }
2702 }
2703
2704 #else /* CONFIG_PROC_SYSCTL */
2705
2706 int proc_dostring(struct ctl_table *table, int write,
2707 void __user *buffer, size_t *lenp, loff_t *ppos)
2708 {
2709 return -ENOSYS;
2710 }
2711
2712 int proc_dointvec(struct ctl_table *table, int write,
2713 void __user *buffer, size_t *lenp, loff_t *ppos)
2714 {
2715 return -ENOSYS;
2716 }
2717
2718 int proc_dointvec_minmax(struct ctl_table *table, int write,
2719 void __user *buffer, size_t *lenp, loff_t *ppos)
2720 {
2721 return -ENOSYS;
2722 }
2723
2724 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2725 void __user *buffer, size_t *lenp, loff_t *ppos)
2726 {
2727 return -ENOSYS;
2728 }
2729
2730 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2731 void __user *buffer, size_t *lenp, loff_t *ppos)
2732 {
2733 return -ENOSYS;
2734 }
2735
2736 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2737 void __user *buffer, size_t *lenp, loff_t *ppos)
2738 {
2739 return -ENOSYS;
2740 }
2741
2742 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2743 void __user *buffer, size_t *lenp, loff_t *ppos)
2744 {
2745 return -ENOSYS;
2746 }
2747
2748 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2749 void __user *buffer,
2750 size_t *lenp, loff_t *ppos)
2751 {
2752 return -ENOSYS;
2753 }
2754
2755
2756 #endif /* CONFIG_PROC_SYSCTL */
2757
2758 /*
2759 * No sense putting this after each symbol definition, twice,
2760 * exception granted :-)
2761 */
2762 EXPORT_SYMBOL(proc_dointvec);
2763 EXPORT_SYMBOL(proc_dointvec_jiffies);
2764 EXPORT_SYMBOL(proc_dointvec_minmax);
2765 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2766 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2767 EXPORT_SYMBOL(proc_dostring);
2768 EXPORT_SYMBOL(proc_doulongvec_minmax);
2769 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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