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[media] media-device: fix builds when USB or PCI is compiled as module
[deliverable/linux.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/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
35 #include <linux/fs.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68
69 #include <asm/uaccess.h>
70 #include <asm/processor.h>
71
72 #ifdef CONFIG_X86
73 #include <asm/nmi.h>
74 #include <asm/stacktrace.h>
75 #include <asm/io.h>
76 #endif
77 #ifdef CONFIG_SPARC
78 #include <asm/setup.h>
79 #endif
80 #ifdef CONFIG_BSD_PROCESS_ACCT
81 #include <linux/acct.h>
82 #endif
83 #ifdef CONFIG_RT_MUTEXES
84 #include <linux/rtmutex.h>
85 #endif
86 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
87 #include <linux/lockdep.h>
88 #endif
89 #ifdef CONFIG_CHR_DEV_SG
90 #include <scsi/sg.h>
91 #endif
92
93 #ifdef CONFIG_LOCKUP_DETECTOR
94 #include <linux/nmi.h>
95 #endif
96
97 #if defined(CONFIG_SYSCTL)
98
99 /* External variables not in a header file. */
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 static int one_thousand = 1000;
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
141 static int ngroups_max = NGROUPS_MAX;
142 static const int cap_last_cap = CAP_LAST_CAP;
143
144 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
145 #ifdef CONFIG_DETECT_HUNG_TASK
146 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
147 #endif
148
149 #ifdef CONFIG_INOTIFY_USER
150 #include <linux/inotify.h>
151 #endif
152 #ifdef CONFIG_SPARC
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
173 #define SYSCTL_WRITES_LEGACY -1
174 #define SYSCTL_WRITES_WARN 0
175 #define SYSCTL_WRITES_STRICT 1
176
177 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
178
179 static int proc_do_cad_pid(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
181 static int proc_taint(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 #endif
184
185 #ifdef CONFIG_PRINTK
186 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
187 void __user *buffer, size_t *lenp, loff_t *ppos);
188 #endif
189
190 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos);
192 #ifdef CONFIG_COREDUMP
193 static int proc_dostring_coredump(struct ctl_table *table, int write,
194 void __user *buffer, size_t *lenp, loff_t *ppos);
195 #endif
196
197 #ifdef CONFIG_MAGIC_SYSRQ
198 /* Note: sysrq code uses it's own private copy */
199 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
200
201 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
202 void __user *buffer, size_t *lenp,
203 loff_t *ppos)
204 {
205 int error;
206
207 error = proc_dointvec(table, write, buffer, lenp, ppos);
208 if (error)
209 return error;
210
211 if (write)
212 sysrq_toggle_support(__sysrq_enabled);
213
214 return 0;
215 }
216
217 #endif
218
219 static struct ctl_table kern_table[];
220 static struct ctl_table vm_table[];
221 static struct ctl_table fs_table[];
222 static struct ctl_table debug_table[];
223 static struct ctl_table dev_table[];
224 extern struct ctl_table random_table[];
225 #ifdef CONFIG_EPOLL
226 extern struct ctl_table epoll_table[];
227 #endif
228
229 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
230 int sysctl_legacy_va_layout;
231 #endif
232
233 /* The default sysctl tables: */
234
235 static struct ctl_table sysctl_base_table[] = {
236 {
237 .procname = "kernel",
238 .mode = 0555,
239 .child = kern_table,
240 },
241 {
242 .procname = "vm",
243 .mode = 0555,
244 .child = vm_table,
245 },
246 {
247 .procname = "fs",
248 .mode = 0555,
249 .child = fs_table,
250 },
251 {
252 .procname = "debug",
253 .mode = 0555,
254 .child = debug_table,
255 },
256 {
257 .procname = "dev",
258 .mode = 0555,
259 .child = dev_table,
260 },
261 { }
262 };
263
264 #ifdef CONFIG_SCHED_DEBUG
265 static int min_sched_granularity_ns = 100000; /* 100 usecs */
266 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
267 static int min_wakeup_granularity_ns; /* 0 usecs */
268 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
269 #ifdef CONFIG_SMP
270 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
271 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
272 #endif /* CONFIG_SMP */
273 #endif /* CONFIG_SCHED_DEBUG */
274
275 #ifdef CONFIG_COMPACTION
276 static int min_extfrag_threshold;
277 static int max_extfrag_threshold = 1000;
278 #endif
279
280 static struct ctl_table kern_table[] = {
281 {
282 .procname = "sched_child_runs_first",
283 .data = &sysctl_sched_child_runs_first,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = proc_dointvec,
287 },
288 #ifdef CONFIG_SCHED_DEBUG
289 {
290 .procname = "sched_min_granularity_ns",
291 .data = &sysctl_sched_min_granularity,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = sched_proc_update_handler,
295 .extra1 = &min_sched_granularity_ns,
296 .extra2 = &max_sched_granularity_ns,
297 },
298 {
299 .procname = "sched_latency_ns",
300 .data = &sysctl_sched_latency,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_sched_granularity_ns,
305 .extra2 = &max_sched_granularity_ns,
306 },
307 {
308 .procname = "sched_wakeup_granularity_ns",
309 .data = &sysctl_sched_wakeup_granularity,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = sched_proc_update_handler,
313 .extra1 = &min_wakeup_granularity_ns,
314 .extra2 = &max_wakeup_granularity_ns,
315 },
316 #ifdef CONFIG_SMP
317 {
318 .procname = "sched_tunable_scaling",
319 .data = &sysctl_sched_tunable_scaling,
320 .maxlen = sizeof(enum sched_tunable_scaling),
321 .mode = 0644,
322 .proc_handler = sched_proc_update_handler,
323 .extra1 = &min_sched_tunable_scaling,
324 .extra2 = &max_sched_tunable_scaling,
325 },
326 {
327 .procname = "sched_migration_cost_ns",
328 .data = &sysctl_sched_migration_cost,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec,
332 },
333 {
334 .procname = "sched_nr_migrate",
335 .data = &sysctl_sched_nr_migrate,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "sched_time_avg_ms",
342 .data = &sysctl_sched_time_avg,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
347 {
348 .procname = "sched_shares_window_ns",
349 .data = &sysctl_sched_shares_window,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec,
353 },
354 #ifdef CONFIG_SCHEDSTATS
355 {
356 .procname = "sched_schedstats",
357 .data = NULL,
358 .maxlen = sizeof(unsigned int),
359 .mode = 0644,
360 .proc_handler = sysctl_schedstats,
361 .extra1 = &zero,
362 .extra2 = &one,
363 },
364 #endif /* CONFIG_SCHEDSTATS */
365 #endif /* CONFIG_SMP */
366 #ifdef CONFIG_NUMA_BALANCING
367 {
368 .procname = "numa_balancing_scan_delay_ms",
369 .data = &sysctl_numa_balancing_scan_delay,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec,
373 },
374 {
375 .procname = "numa_balancing_scan_period_min_ms",
376 .data = &sysctl_numa_balancing_scan_period_min,
377 .maxlen = sizeof(unsigned int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec,
380 },
381 {
382 .procname = "numa_balancing_scan_period_max_ms",
383 .data = &sysctl_numa_balancing_scan_period_max,
384 .maxlen = sizeof(unsigned int),
385 .mode = 0644,
386 .proc_handler = proc_dointvec,
387 },
388 {
389 .procname = "numa_balancing_scan_size_mb",
390 .data = &sysctl_numa_balancing_scan_size,
391 .maxlen = sizeof(unsigned int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec_minmax,
394 .extra1 = &one,
395 },
396 {
397 .procname = "numa_balancing",
398 .data = NULL, /* filled in by handler */
399 .maxlen = sizeof(unsigned int),
400 .mode = 0644,
401 .proc_handler = sysctl_numa_balancing,
402 .extra1 = &zero,
403 .extra2 = &one,
404 },
405 #endif /* CONFIG_NUMA_BALANCING */
406 #endif /* CONFIG_SCHED_DEBUG */
407 {
408 .procname = "sched_rt_period_us",
409 .data = &sysctl_sched_rt_period,
410 .maxlen = sizeof(unsigned int),
411 .mode = 0644,
412 .proc_handler = sched_rt_handler,
413 },
414 {
415 .procname = "sched_rt_runtime_us",
416 .data = &sysctl_sched_rt_runtime,
417 .maxlen = sizeof(int),
418 .mode = 0644,
419 .proc_handler = sched_rt_handler,
420 },
421 {
422 .procname = "sched_rr_timeslice_ms",
423 .data = &sched_rr_timeslice,
424 .maxlen = sizeof(int),
425 .mode = 0644,
426 .proc_handler = sched_rr_handler,
427 },
428 #ifdef CONFIG_SCHED_AUTOGROUP
429 {
430 .procname = "sched_autogroup_enabled",
431 .data = &sysctl_sched_autogroup_enabled,
432 .maxlen = sizeof(unsigned int),
433 .mode = 0644,
434 .proc_handler = proc_dointvec_minmax,
435 .extra1 = &zero,
436 .extra2 = &one,
437 },
438 #endif
439 #ifdef CONFIG_CFS_BANDWIDTH
440 {
441 .procname = "sched_cfs_bandwidth_slice_us",
442 .data = &sysctl_sched_cfs_bandwidth_slice,
443 .maxlen = sizeof(unsigned int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec_minmax,
446 .extra1 = &one,
447 },
448 #endif
449 #ifdef CONFIG_PROVE_LOCKING
450 {
451 .procname = "prove_locking",
452 .data = &prove_locking,
453 .maxlen = sizeof(int),
454 .mode = 0644,
455 .proc_handler = proc_dointvec,
456 },
457 #endif
458 #ifdef CONFIG_LOCK_STAT
459 {
460 .procname = "lock_stat",
461 .data = &lock_stat,
462 .maxlen = sizeof(int),
463 .mode = 0644,
464 .proc_handler = proc_dointvec,
465 },
466 #endif
467 {
468 .procname = "panic",
469 .data = &panic_timeout,
470 .maxlen = sizeof(int),
471 .mode = 0644,
472 .proc_handler = proc_dointvec,
473 },
474 #ifdef CONFIG_COREDUMP
475 {
476 .procname = "core_uses_pid",
477 .data = &core_uses_pid,
478 .maxlen = sizeof(int),
479 .mode = 0644,
480 .proc_handler = proc_dointvec,
481 },
482 {
483 .procname = "core_pattern",
484 .data = core_pattern,
485 .maxlen = CORENAME_MAX_SIZE,
486 .mode = 0644,
487 .proc_handler = proc_dostring_coredump,
488 },
489 {
490 .procname = "core_pipe_limit",
491 .data = &core_pipe_limit,
492 .maxlen = sizeof(unsigned int),
493 .mode = 0644,
494 .proc_handler = proc_dointvec,
495 },
496 #endif
497 #ifdef CONFIG_PROC_SYSCTL
498 {
499 .procname = "tainted",
500 .maxlen = sizeof(long),
501 .mode = 0644,
502 .proc_handler = proc_taint,
503 },
504 {
505 .procname = "sysctl_writes_strict",
506 .data = &sysctl_writes_strict,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec_minmax,
510 .extra1 = &neg_one,
511 .extra2 = &one,
512 },
513 #endif
514 #ifdef CONFIG_LATENCYTOP
515 {
516 .procname = "latencytop",
517 .data = &latencytop_enabled,
518 .maxlen = sizeof(int),
519 .mode = 0644,
520 .proc_handler = sysctl_latencytop,
521 },
522 #endif
523 #ifdef CONFIG_BLK_DEV_INITRD
524 {
525 .procname = "real-root-dev",
526 .data = &real_root_dev,
527 .maxlen = sizeof(int),
528 .mode = 0644,
529 .proc_handler = proc_dointvec,
530 },
531 #endif
532 {
533 .procname = "print-fatal-signals",
534 .data = &print_fatal_signals,
535 .maxlen = sizeof(int),
536 .mode = 0644,
537 .proc_handler = proc_dointvec,
538 },
539 #ifdef CONFIG_SPARC
540 {
541 .procname = "reboot-cmd",
542 .data = reboot_command,
543 .maxlen = 256,
544 .mode = 0644,
545 .proc_handler = proc_dostring,
546 },
547 {
548 .procname = "stop-a",
549 .data = &stop_a_enabled,
550 .maxlen = sizeof (int),
551 .mode = 0644,
552 .proc_handler = proc_dointvec,
553 },
554 {
555 .procname = "scons-poweroff",
556 .data = &scons_pwroff,
557 .maxlen = sizeof (int),
558 .mode = 0644,
559 .proc_handler = proc_dointvec,
560 },
561 #endif
562 #ifdef CONFIG_SPARC64
563 {
564 .procname = "tsb-ratio",
565 .data = &sysctl_tsb_ratio,
566 .maxlen = sizeof (int),
567 .mode = 0644,
568 .proc_handler = proc_dointvec,
569 },
570 #endif
571 #ifdef __hppa__
572 {
573 .procname = "soft-power",
574 .data = &pwrsw_enabled,
575 .maxlen = sizeof (int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec,
578 },
579 #endif
580 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
581 {
582 .procname = "unaligned-trap",
583 .data = &unaligned_enabled,
584 .maxlen = sizeof (int),
585 .mode = 0644,
586 .proc_handler = proc_dointvec,
587 },
588 #endif
589 {
590 .procname = "ctrl-alt-del",
591 .data = &C_A_D,
592 .maxlen = sizeof(int),
593 .mode = 0644,
594 .proc_handler = proc_dointvec,
595 },
596 #ifdef CONFIG_FUNCTION_TRACER
597 {
598 .procname = "ftrace_enabled",
599 .data = &ftrace_enabled,
600 .maxlen = sizeof(int),
601 .mode = 0644,
602 .proc_handler = ftrace_enable_sysctl,
603 },
604 #endif
605 #ifdef CONFIG_STACK_TRACER
606 {
607 .procname = "stack_tracer_enabled",
608 .data = &stack_tracer_enabled,
609 .maxlen = sizeof(int),
610 .mode = 0644,
611 .proc_handler = stack_trace_sysctl,
612 },
613 #endif
614 #ifdef CONFIG_TRACING
615 {
616 .procname = "ftrace_dump_on_oops",
617 .data = &ftrace_dump_on_oops,
618 .maxlen = sizeof(int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec,
621 },
622 {
623 .procname = "traceoff_on_warning",
624 .data = &__disable_trace_on_warning,
625 .maxlen = sizeof(__disable_trace_on_warning),
626 .mode = 0644,
627 .proc_handler = proc_dointvec,
628 },
629 {
630 .procname = "tracepoint_printk",
631 .data = &tracepoint_printk,
632 .maxlen = sizeof(tracepoint_printk),
633 .mode = 0644,
634 .proc_handler = proc_dointvec,
635 },
636 #endif
637 #ifdef CONFIG_KEXEC_CORE
638 {
639 .procname = "kexec_load_disabled",
640 .data = &kexec_load_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 #ifdef CONFIG_MODULES
650 {
651 .procname = "modprobe",
652 .data = &modprobe_path,
653 .maxlen = KMOD_PATH_LEN,
654 .mode = 0644,
655 .proc_handler = proc_dostring,
656 },
657 {
658 .procname = "modules_disabled",
659 .data = &modules_disabled,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 /* only handle a transition from default "0" to "1" */
663 .proc_handler = proc_dointvec_minmax,
664 .extra1 = &one,
665 .extra2 = &one,
666 },
667 #endif
668 #ifdef CONFIG_UEVENT_HELPER
669 {
670 .procname = "hotplug",
671 .data = &uevent_helper,
672 .maxlen = UEVENT_HELPER_PATH_LEN,
673 .mode = 0644,
674 .proc_handler = proc_dostring,
675 },
676 #endif
677 #ifdef CONFIG_CHR_DEV_SG
678 {
679 .procname = "sg-big-buff",
680 .data = &sg_big_buff,
681 .maxlen = sizeof (int),
682 .mode = 0444,
683 .proc_handler = proc_dointvec,
684 },
685 #endif
686 #ifdef CONFIG_BSD_PROCESS_ACCT
687 {
688 .procname = "acct",
689 .data = &acct_parm,
690 .maxlen = 3*sizeof(int),
691 .mode = 0644,
692 .proc_handler = proc_dointvec,
693 },
694 #endif
695 #ifdef CONFIG_MAGIC_SYSRQ
696 {
697 .procname = "sysrq",
698 .data = &__sysrq_enabled,
699 .maxlen = sizeof (int),
700 .mode = 0644,
701 .proc_handler = sysrq_sysctl_handler,
702 },
703 #endif
704 #ifdef CONFIG_PROC_SYSCTL
705 {
706 .procname = "cad_pid",
707 .data = NULL,
708 .maxlen = sizeof (int),
709 .mode = 0600,
710 .proc_handler = proc_do_cad_pid,
711 },
712 #endif
713 {
714 .procname = "threads-max",
715 .data = NULL,
716 .maxlen = sizeof(int),
717 .mode = 0644,
718 .proc_handler = sysctl_max_threads,
719 },
720 {
721 .procname = "random",
722 .mode = 0555,
723 .child = random_table,
724 },
725 {
726 .procname = "usermodehelper",
727 .mode = 0555,
728 .child = usermodehelper_table,
729 },
730 {
731 .procname = "overflowuid",
732 .data = &overflowuid,
733 .maxlen = sizeof(int),
734 .mode = 0644,
735 .proc_handler = proc_dointvec_minmax,
736 .extra1 = &minolduid,
737 .extra2 = &maxolduid,
738 },
739 {
740 .procname = "overflowgid",
741 .data = &overflowgid,
742 .maxlen = sizeof(int),
743 .mode = 0644,
744 .proc_handler = proc_dointvec_minmax,
745 .extra1 = &minolduid,
746 .extra2 = &maxolduid,
747 },
748 #ifdef CONFIG_S390
749 #ifdef CONFIG_MATHEMU
750 {
751 .procname = "ieee_emulation_warnings",
752 .data = &sysctl_ieee_emulation_warnings,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec,
756 },
757 #endif
758 {
759 .procname = "userprocess_debug",
760 .data = &show_unhandled_signals,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec,
764 },
765 #endif
766 {
767 .procname = "pid_max",
768 .data = &pid_max,
769 .maxlen = sizeof (int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec_minmax,
772 .extra1 = &pid_max_min,
773 .extra2 = &pid_max_max,
774 },
775 {
776 .procname = "panic_on_oops",
777 .data = &panic_on_oops,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec,
781 },
782 #if defined CONFIG_PRINTK
783 {
784 .procname = "printk",
785 .data = &console_loglevel,
786 .maxlen = 4*sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec,
789 },
790 {
791 .procname = "printk_ratelimit",
792 .data = &printk_ratelimit_state.interval,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec_jiffies,
796 },
797 {
798 .procname = "printk_ratelimit_burst",
799 .data = &printk_ratelimit_state.burst,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec,
803 },
804 {
805 .procname = "printk_delay",
806 .data = &printk_delay_msec,
807 .maxlen = sizeof(int),
808 .mode = 0644,
809 .proc_handler = proc_dointvec_minmax,
810 .extra1 = &zero,
811 .extra2 = &ten_thousand,
812 },
813 {
814 .procname = "dmesg_restrict",
815 .data = &dmesg_restrict,
816 .maxlen = sizeof(int),
817 .mode = 0644,
818 .proc_handler = proc_dointvec_minmax_sysadmin,
819 .extra1 = &zero,
820 .extra2 = &one,
821 },
822 {
823 .procname = "kptr_restrict",
824 .data = &kptr_restrict,
825 .maxlen = sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec_minmax_sysadmin,
828 .extra1 = &zero,
829 .extra2 = &two,
830 },
831 #endif
832 {
833 .procname = "ngroups_max",
834 .data = &ngroups_max,
835 .maxlen = sizeof (int),
836 .mode = 0444,
837 .proc_handler = proc_dointvec,
838 },
839 {
840 .procname = "cap_last_cap",
841 .data = (void *)&cap_last_cap,
842 .maxlen = sizeof(int),
843 .mode = 0444,
844 .proc_handler = proc_dointvec,
845 },
846 #if defined(CONFIG_LOCKUP_DETECTOR)
847 {
848 .procname = "watchdog",
849 .data = &watchdog_user_enabled,
850 .maxlen = sizeof (int),
851 .mode = 0644,
852 .proc_handler = proc_watchdog,
853 .extra1 = &zero,
854 .extra2 = &one,
855 },
856 {
857 .procname = "watchdog_thresh",
858 .data = &watchdog_thresh,
859 .maxlen = sizeof(int),
860 .mode = 0644,
861 .proc_handler = proc_watchdog_thresh,
862 .extra1 = &zero,
863 .extra2 = &sixty,
864 },
865 {
866 .procname = "nmi_watchdog",
867 .data = &nmi_watchdog_enabled,
868 .maxlen = sizeof (int),
869 .mode = 0644,
870 .proc_handler = proc_nmi_watchdog,
871 .extra1 = &zero,
872 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
873 .extra2 = &one,
874 #else
875 .extra2 = &zero,
876 #endif
877 },
878 {
879 .procname = "soft_watchdog",
880 .data = &soft_watchdog_enabled,
881 .maxlen = sizeof (int),
882 .mode = 0644,
883 .proc_handler = proc_soft_watchdog,
884 .extra1 = &zero,
885 .extra2 = &one,
886 },
887 {
888 .procname = "watchdog_cpumask",
889 .data = &watchdog_cpumask_bits,
890 .maxlen = NR_CPUS,
891 .mode = 0644,
892 .proc_handler = proc_watchdog_cpumask,
893 },
894 {
895 .procname = "softlockup_panic",
896 .data = &softlockup_panic,
897 .maxlen = sizeof(int),
898 .mode = 0644,
899 .proc_handler = proc_dointvec_minmax,
900 .extra1 = &zero,
901 .extra2 = &one,
902 },
903 #ifdef CONFIG_HARDLOCKUP_DETECTOR
904 {
905 .procname = "hardlockup_panic",
906 .data = &hardlockup_panic,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec_minmax,
910 .extra1 = &zero,
911 .extra2 = &one,
912 },
913 #endif
914 #ifdef CONFIG_SMP
915 {
916 .procname = "softlockup_all_cpu_backtrace",
917 .data = &sysctl_softlockup_all_cpu_backtrace,
918 .maxlen = sizeof(int),
919 .mode = 0644,
920 .proc_handler = proc_dointvec_minmax,
921 .extra1 = &zero,
922 .extra2 = &one,
923 },
924 {
925 .procname = "hardlockup_all_cpu_backtrace",
926 .data = &sysctl_hardlockup_all_cpu_backtrace,
927 .maxlen = sizeof(int),
928 .mode = 0644,
929 .proc_handler = proc_dointvec_minmax,
930 .extra1 = &zero,
931 .extra2 = &one,
932 },
933 #endif /* CONFIG_SMP */
934 #endif
935 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
936 {
937 .procname = "unknown_nmi_panic",
938 .data = &unknown_nmi_panic,
939 .maxlen = sizeof (int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec,
942 },
943 #endif
944 #if defined(CONFIG_X86)
945 {
946 .procname = "panic_on_unrecovered_nmi",
947 .data = &panic_on_unrecovered_nmi,
948 .maxlen = sizeof(int),
949 .mode = 0644,
950 .proc_handler = proc_dointvec,
951 },
952 {
953 .procname = "panic_on_io_nmi",
954 .data = &panic_on_io_nmi,
955 .maxlen = sizeof(int),
956 .mode = 0644,
957 .proc_handler = proc_dointvec,
958 },
959 #ifdef CONFIG_DEBUG_STACKOVERFLOW
960 {
961 .procname = "panic_on_stackoverflow",
962 .data = &sysctl_panic_on_stackoverflow,
963 .maxlen = sizeof(int),
964 .mode = 0644,
965 .proc_handler = proc_dointvec,
966 },
967 #endif
968 {
969 .procname = "bootloader_type",
970 .data = &bootloader_type,
971 .maxlen = sizeof (int),
972 .mode = 0444,
973 .proc_handler = proc_dointvec,
974 },
975 {
976 .procname = "bootloader_version",
977 .data = &bootloader_version,
978 .maxlen = sizeof (int),
979 .mode = 0444,
980 .proc_handler = proc_dointvec,
981 },
982 {
983 .procname = "kstack_depth_to_print",
984 .data = &kstack_depth_to_print,
985 .maxlen = sizeof(int),
986 .mode = 0644,
987 .proc_handler = proc_dointvec,
988 },
989 {
990 .procname = "io_delay_type",
991 .data = &io_delay_type,
992 .maxlen = sizeof(int),
993 .mode = 0644,
994 .proc_handler = proc_dointvec,
995 },
996 #endif
997 #if defined(CONFIG_MMU)
998 {
999 .procname = "randomize_va_space",
1000 .data = &randomize_va_space,
1001 .maxlen = sizeof(int),
1002 .mode = 0644,
1003 .proc_handler = proc_dointvec,
1004 },
1005 #endif
1006 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1007 {
1008 .procname = "spin_retry",
1009 .data = &spin_retry,
1010 .maxlen = sizeof (int),
1011 .mode = 0644,
1012 .proc_handler = proc_dointvec,
1013 },
1014 #endif
1015 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1016 {
1017 .procname = "acpi_video_flags",
1018 .data = &acpi_realmode_flags,
1019 .maxlen = sizeof (unsigned long),
1020 .mode = 0644,
1021 .proc_handler = proc_doulongvec_minmax,
1022 },
1023 #endif
1024 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1025 {
1026 .procname = "ignore-unaligned-usertrap",
1027 .data = &no_unaligned_warning,
1028 .maxlen = sizeof (int),
1029 .mode = 0644,
1030 .proc_handler = proc_dointvec,
1031 },
1032 #endif
1033 #ifdef CONFIG_IA64
1034 {
1035 .procname = "unaligned-dump-stack",
1036 .data = &unaligned_dump_stack,
1037 .maxlen = sizeof (int),
1038 .mode = 0644,
1039 .proc_handler = proc_dointvec,
1040 },
1041 #endif
1042 #ifdef CONFIG_DETECT_HUNG_TASK
1043 {
1044 .procname = "hung_task_panic",
1045 .data = &sysctl_hung_task_panic,
1046 .maxlen = sizeof(int),
1047 .mode = 0644,
1048 .proc_handler = proc_dointvec_minmax,
1049 .extra1 = &zero,
1050 .extra2 = &one,
1051 },
1052 {
1053 .procname = "hung_task_check_count",
1054 .data = &sysctl_hung_task_check_count,
1055 .maxlen = sizeof(int),
1056 .mode = 0644,
1057 .proc_handler = proc_dointvec_minmax,
1058 .extra1 = &zero,
1059 },
1060 {
1061 .procname = "hung_task_timeout_secs",
1062 .data = &sysctl_hung_task_timeout_secs,
1063 .maxlen = sizeof(unsigned long),
1064 .mode = 0644,
1065 .proc_handler = proc_dohung_task_timeout_secs,
1066 .extra2 = &hung_task_timeout_max,
1067 },
1068 {
1069 .procname = "hung_task_warnings",
1070 .data = &sysctl_hung_task_warnings,
1071 .maxlen = sizeof(int),
1072 .mode = 0644,
1073 .proc_handler = proc_dointvec_minmax,
1074 .extra1 = &neg_one,
1075 },
1076 #endif
1077 #ifdef CONFIG_COMPAT
1078 {
1079 .procname = "compat-log",
1080 .data = &compat_log,
1081 .maxlen = sizeof (int),
1082 .mode = 0644,
1083 .proc_handler = proc_dointvec,
1084 },
1085 #endif
1086 #ifdef CONFIG_RT_MUTEXES
1087 {
1088 .procname = "max_lock_depth",
1089 .data = &max_lock_depth,
1090 .maxlen = sizeof(int),
1091 .mode = 0644,
1092 .proc_handler = proc_dointvec,
1093 },
1094 #endif
1095 {
1096 .procname = "poweroff_cmd",
1097 .data = &poweroff_cmd,
1098 .maxlen = POWEROFF_CMD_PATH_LEN,
1099 .mode = 0644,
1100 .proc_handler = proc_dostring,
1101 },
1102 #ifdef CONFIG_KEYS
1103 {
1104 .procname = "keys",
1105 .mode = 0555,
1106 .child = key_sysctls,
1107 },
1108 #endif
1109 #ifdef CONFIG_PERF_EVENTS
1110 /*
1111 * User-space scripts rely on the existence of this file
1112 * as a feature check for perf_events being enabled.
1113 *
1114 * So it's an ABI, do not remove!
1115 */
1116 {
1117 .procname = "perf_event_paranoid",
1118 .data = &sysctl_perf_event_paranoid,
1119 .maxlen = sizeof(sysctl_perf_event_paranoid),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec,
1122 },
1123 {
1124 .procname = "perf_event_mlock_kb",
1125 .data = &sysctl_perf_event_mlock,
1126 .maxlen = sizeof(sysctl_perf_event_mlock),
1127 .mode = 0644,
1128 .proc_handler = proc_dointvec,
1129 },
1130 {
1131 .procname = "perf_event_max_sample_rate",
1132 .data = &sysctl_perf_event_sample_rate,
1133 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1134 .mode = 0644,
1135 .proc_handler = perf_proc_update_handler,
1136 .extra1 = &one,
1137 },
1138 {
1139 .procname = "perf_cpu_time_max_percent",
1140 .data = &sysctl_perf_cpu_time_max_percent,
1141 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1142 .mode = 0644,
1143 .proc_handler = perf_cpu_time_max_percent_handler,
1144 .extra1 = &zero,
1145 .extra2 = &one_hundred,
1146 },
1147 #endif
1148 #ifdef CONFIG_KMEMCHECK
1149 {
1150 .procname = "kmemcheck",
1151 .data = &kmemcheck_enabled,
1152 .maxlen = sizeof(int),
1153 .mode = 0644,
1154 .proc_handler = proc_dointvec,
1155 },
1156 #endif
1157 {
1158 .procname = "panic_on_warn",
1159 .data = &panic_on_warn,
1160 .maxlen = sizeof(int),
1161 .mode = 0644,
1162 .proc_handler = proc_dointvec_minmax,
1163 .extra1 = &zero,
1164 .extra2 = &one,
1165 },
1166 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1167 {
1168 .procname = "timer_migration",
1169 .data = &sysctl_timer_migration,
1170 .maxlen = sizeof(unsigned int),
1171 .mode = 0644,
1172 .proc_handler = timer_migration_handler,
1173 },
1174 #endif
1175 #ifdef CONFIG_BPF_SYSCALL
1176 {
1177 .procname = "unprivileged_bpf_disabled",
1178 .data = &sysctl_unprivileged_bpf_disabled,
1179 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1180 .mode = 0644,
1181 /* only handle a transition from default "0" to "1" */
1182 .proc_handler = proc_dointvec_minmax,
1183 .extra1 = &one,
1184 .extra2 = &one,
1185 },
1186 #endif
1187 { }
1188 };
1189
1190 static struct ctl_table vm_table[] = {
1191 {
1192 .procname = "overcommit_memory",
1193 .data = &sysctl_overcommit_memory,
1194 .maxlen = sizeof(sysctl_overcommit_memory),
1195 .mode = 0644,
1196 .proc_handler = proc_dointvec_minmax,
1197 .extra1 = &zero,
1198 .extra2 = &two,
1199 },
1200 {
1201 .procname = "panic_on_oom",
1202 .data = &sysctl_panic_on_oom,
1203 .maxlen = sizeof(sysctl_panic_on_oom),
1204 .mode = 0644,
1205 .proc_handler = proc_dointvec_minmax,
1206 .extra1 = &zero,
1207 .extra2 = &two,
1208 },
1209 {
1210 .procname = "oom_kill_allocating_task",
1211 .data = &sysctl_oom_kill_allocating_task,
1212 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1213 .mode = 0644,
1214 .proc_handler = proc_dointvec,
1215 },
1216 {
1217 .procname = "oom_dump_tasks",
1218 .data = &sysctl_oom_dump_tasks,
1219 .maxlen = sizeof(sysctl_oom_dump_tasks),
1220 .mode = 0644,
1221 .proc_handler = proc_dointvec,
1222 },
1223 {
1224 .procname = "overcommit_ratio",
1225 .data = &sysctl_overcommit_ratio,
1226 .maxlen = sizeof(sysctl_overcommit_ratio),
1227 .mode = 0644,
1228 .proc_handler = overcommit_ratio_handler,
1229 },
1230 {
1231 .procname = "overcommit_kbytes",
1232 .data = &sysctl_overcommit_kbytes,
1233 .maxlen = sizeof(sysctl_overcommit_kbytes),
1234 .mode = 0644,
1235 .proc_handler = overcommit_kbytes_handler,
1236 },
1237 {
1238 .procname = "page-cluster",
1239 .data = &page_cluster,
1240 .maxlen = sizeof(int),
1241 .mode = 0644,
1242 .proc_handler = proc_dointvec_minmax,
1243 .extra1 = &zero,
1244 },
1245 {
1246 .procname = "dirty_background_ratio",
1247 .data = &dirty_background_ratio,
1248 .maxlen = sizeof(dirty_background_ratio),
1249 .mode = 0644,
1250 .proc_handler = dirty_background_ratio_handler,
1251 .extra1 = &zero,
1252 .extra2 = &one_hundred,
1253 },
1254 {
1255 .procname = "dirty_background_bytes",
1256 .data = &dirty_background_bytes,
1257 .maxlen = sizeof(dirty_background_bytes),
1258 .mode = 0644,
1259 .proc_handler = dirty_background_bytes_handler,
1260 .extra1 = &one_ul,
1261 },
1262 {
1263 .procname = "dirty_ratio",
1264 .data = &vm_dirty_ratio,
1265 .maxlen = sizeof(vm_dirty_ratio),
1266 .mode = 0644,
1267 .proc_handler = dirty_ratio_handler,
1268 .extra1 = &zero,
1269 .extra2 = &one_hundred,
1270 },
1271 {
1272 .procname = "dirty_bytes",
1273 .data = &vm_dirty_bytes,
1274 .maxlen = sizeof(vm_dirty_bytes),
1275 .mode = 0644,
1276 .proc_handler = dirty_bytes_handler,
1277 .extra1 = &dirty_bytes_min,
1278 },
1279 {
1280 .procname = "dirty_writeback_centisecs",
1281 .data = &dirty_writeback_interval,
1282 .maxlen = sizeof(dirty_writeback_interval),
1283 .mode = 0644,
1284 .proc_handler = dirty_writeback_centisecs_handler,
1285 },
1286 {
1287 .procname = "dirty_expire_centisecs",
1288 .data = &dirty_expire_interval,
1289 .maxlen = sizeof(dirty_expire_interval),
1290 .mode = 0644,
1291 .proc_handler = proc_dointvec_minmax,
1292 .extra1 = &zero,
1293 },
1294 {
1295 .procname = "dirtytime_expire_seconds",
1296 .data = &dirtytime_expire_interval,
1297 .maxlen = sizeof(dirty_expire_interval),
1298 .mode = 0644,
1299 .proc_handler = dirtytime_interval_handler,
1300 .extra1 = &zero,
1301 },
1302 {
1303 .procname = "nr_pdflush_threads",
1304 .mode = 0444 /* read-only */,
1305 .proc_handler = pdflush_proc_obsolete,
1306 },
1307 {
1308 .procname = "swappiness",
1309 .data = &vm_swappiness,
1310 .maxlen = sizeof(vm_swappiness),
1311 .mode = 0644,
1312 .proc_handler = proc_dointvec_minmax,
1313 .extra1 = &zero,
1314 .extra2 = &one_hundred,
1315 },
1316 #ifdef CONFIG_HUGETLB_PAGE
1317 {
1318 .procname = "nr_hugepages",
1319 .data = NULL,
1320 .maxlen = sizeof(unsigned long),
1321 .mode = 0644,
1322 .proc_handler = hugetlb_sysctl_handler,
1323 },
1324 #ifdef CONFIG_NUMA
1325 {
1326 .procname = "nr_hugepages_mempolicy",
1327 .data = NULL,
1328 .maxlen = sizeof(unsigned long),
1329 .mode = 0644,
1330 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1331 },
1332 #endif
1333 {
1334 .procname = "hugetlb_shm_group",
1335 .data = &sysctl_hugetlb_shm_group,
1336 .maxlen = sizeof(gid_t),
1337 .mode = 0644,
1338 .proc_handler = proc_dointvec,
1339 },
1340 {
1341 .procname = "hugepages_treat_as_movable",
1342 .data = &hugepages_treat_as_movable,
1343 .maxlen = sizeof(int),
1344 .mode = 0644,
1345 .proc_handler = proc_dointvec,
1346 },
1347 {
1348 .procname = "nr_overcommit_hugepages",
1349 .data = NULL,
1350 .maxlen = sizeof(unsigned long),
1351 .mode = 0644,
1352 .proc_handler = hugetlb_overcommit_handler,
1353 },
1354 #endif
1355 {
1356 .procname = "lowmem_reserve_ratio",
1357 .data = &sysctl_lowmem_reserve_ratio,
1358 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1359 .mode = 0644,
1360 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1361 },
1362 {
1363 .procname = "drop_caches",
1364 .data = &sysctl_drop_caches,
1365 .maxlen = sizeof(int),
1366 .mode = 0644,
1367 .proc_handler = drop_caches_sysctl_handler,
1368 .extra1 = &one,
1369 .extra2 = &four,
1370 },
1371 #ifdef CONFIG_COMPACTION
1372 {
1373 .procname = "compact_memory",
1374 .data = &sysctl_compact_memory,
1375 .maxlen = sizeof(int),
1376 .mode = 0200,
1377 .proc_handler = sysctl_compaction_handler,
1378 },
1379 {
1380 .procname = "extfrag_threshold",
1381 .data = &sysctl_extfrag_threshold,
1382 .maxlen = sizeof(int),
1383 .mode = 0644,
1384 .proc_handler = sysctl_extfrag_handler,
1385 .extra1 = &min_extfrag_threshold,
1386 .extra2 = &max_extfrag_threshold,
1387 },
1388 {
1389 .procname = "compact_unevictable_allowed",
1390 .data = &sysctl_compact_unevictable_allowed,
1391 .maxlen = sizeof(int),
1392 .mode = 0644,
1393 .proc_handler = proc_dointvec,
1394 .extra1 = &zero,
1395 .extra2 = &one,
1396 },
1397
1398 #endif /* CONFIG_COMPACTION */
1399 {
1400 .procname = "min_free_kbytes",
1401 .data = &min_free_kbytes,
1402 .maxlen = sizeof(min_free_kbytes),
1403 .mode = 0644,
1404 .proc_handler = min_free_kbytes_sysctl_handler,
1405 .extra1 = &zero,
1406 },
1407 {
1408 .procname = "watermark_scale_factor",
1409 .data = &watermark_scale_factor,
1410 .maxlen = sizeof(watermark_scale_factor),
1411 .mode = 0644,
1412 .proc_handler = watermark_scale_factor_sysctl_handler,
1413 .extra1 = &one,
1414 .extra2 = &one_thousand,
1415 },
1416 {
1417 .procname = "percpu_pagelist_fraction",
1418 .data = &percpu_pagelist_fraction,
1419 .maxlen = sizeof(percpu_pagelist_fraction),
1420 .mode = 0644,
1421 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1422 .extra1 = &zero,
1423 },
1424 #ifdef CONFIG_MMU
1425 {
1426 .procname = "max_map_count",
1427 .data = &sysctl_max_map_count,
1428 .maxlen = sizeof(sysctl_max_map_count),
1429 .mode = 0644,
1430 .proc_handler = proc_dointvec_minmax,
1431 .extra1 = &zero,
1432 },
1433 #else
1434 {
1435 .procname = "nr_trim_pages",
1436 .data = &sysctl_nr_trim_pages,
1437 .maxlen = sizeof(sysctl_nr_trim_pages),
1438 .mode = 0644,
1439 .proc_handler = proc_dointvec_minmax,
1440 .extra1 = &zero,
1441 },
1442 #endif
1443 {
1444 .procname = "laptop_mode",
1445 .data = &laptop_mode,
1446 .maxlen = sizeof(laptop_mode),
1447 .mode = 0644,
1448 .proc_handler = proc_dointvec_jiffies,
1449 },
1450 {
1451 .procname = "block_dump",
1452 .data = &block_dump,
1453 .maxlen = sizeof(block_dump),
1454 .mode = 0644,
1455 .proc_handler = proc_dointvec,
1456 .extra1 = &zero,
1457 },
1458 {
1459 .procname = "vfs_cache_pressure",
1460 .data = &sysctl_vfs_cache_pressure,
1461 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1462 .mode = 0644,
1463 .proc_handler = proc_dointvec,
1464 .extra1 = &zero,
1465 },
1466 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1467 {
1468 .procname = "legacy_va_layout",
1469 .data = &sysctl_legacy_va_layout,
1470 .maxlen = sizeof(sysctl_legacy_va_layout),
1471 .mode = 0644,
1472 .proc_handler = proc_dointvec,
1473 .extra1 = &zero,
1474 },
1475 #endif
1476 #ifdef CONFIG_NUMA
1477 {
1478 .procname = "zone_reclaim_mode",
1479 .data = &zone_reclaim_mode,
1480 .maxlen = sizeof(zone_reclaim_mode),
1481 .mode = 0644,
1482 .proc_handler = proc_dointvec,
1483 .extra1 = &zero,
1484 },
1485 {
1486 .procname = "min_unmapped_ratio",
1487 .data = &sysctl_min_unmapped_ratio,
1488 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1489 .mode = 0644,
1490 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1491 .extra1 = &zero,
1492 .extra2 = &one_hundred,
1493 },
1494 {
1495 .procname = "min_slab_ratio",
1496 .data = &sysctl_min_slab_ratio,
1497 .maxlen = sizeof(sysctl_min_slab_ratio),
1498 .mode = 0644,
1499 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1500 .extra1 = &zero,
1501 .extra2 = &one_hundred,
1502 },
1503 #endif
1504 #ifdef CONFIG_SMP
1505 {
1506 .procname = "stat_interval",
1507 .data = &sysctl_stat_interval,
1508 .maxlen = sizeof(sysctl_stat_interval),
1509 .mode = 0644,
1510 .proc_handler = proc_dointvec_jiffies,
1511 },
1512 #endif
1513 #ifdef CONFIG_MMU
1514 {
1515 .procname = "mmap_min_addr",
1516 .data = &dac_mmap_min_addr,
1517 .maxlen = sizeof(unsigned long),
1518 .mode = 0644,
1519 .proc_handler = mmap_min_addr_handler,
1520 },
1521 #endif
1522 #ifdef CONFIG_NUMA
1523 {
1524 .procname = "numa_zonelist_order",
1525 .data = &numa_zonelist_order,
1526 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1527 .mode = 0644,
1528 .proc_handler = numa_zonelist_order_handler,
1529 },
1530 #endif
1531 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1532 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1533 {
1534 .procname = "vdso_enabled",
1535 #ifdef CONFIG_X86_32
1536 .data = &vdso32_enabled,
1537 .maxlen = sizeof(vdso32_enabled),
1538 #else
1539 .data = &vdso_enabled,
1540 .maxlen = sizeof(vdso_enabled),
1541 #endif
1542 .mode = 0644,
1543 .proc_handler = proc_dointvec,
1544 .extra1 = &zero,
1545 },
1546 #endif
1547 #ifdef CONFIG_HIGHMEM
1548 {
1549 .procname = "highmem_is_dirtyable",
1550 .data = &vm_highmem_is_dirtyable,
1551 .maxlen = sizeof(vm_highmem_is_dirtyable),
1552 .mode = 0644,
1553 .proc_handler = proc_dointvec_minmax,
1554 .extra1 = &zero,
1555 .extra2 = &one,
1556 },
1557 #endif
1558 #ifdef CONFIG_MEMORY_FAILURE
1559 {
1560 .procname = "memory_failure_early_kill",
1561 .data = &sysctl_memory_failure_early_kill,
1562 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1563 .mode = 0644,
1564 .proc_handler = proc_dointvec_minmax,
1565 .extra1 = &zero,
1566 .extra2 = &one,
1567 },
1568 {
1569 .procname = "memory_failure_recovery",
1570 .data = &sysctl_memory_failure_recovery,
1571 .maxlen = sizeof(sysctl_memory_failure_recovery),
1572 .mode = 0644,
1573 .proc_handler = proc_dointvec_minmax,
1574 .extra1 = &zero,
1575 .extra2 = &one,
1576 },
1577 #endif
1578 {
1579 .procname = "user_reserve_kbytes",
1580 .data = &sysctl_user_reserve_kbytes,
1581 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1582 .mode = 0644,
1583 .proc_handler = proc_doulongvec_minmax,
1584 },
1585 {
1586 .procname = "admin_reserve_kbytes",
1587 .data = &sysctl_admin_reserve_kbytes,
1588 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1589 .mode = 0644,
1590 .proc_handler = proc_doulongvec_minmax,
1591 },
1592 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1593 {
1594 .procname = "mmap_rnd_bits",
1595 .data = &mmap_rnd_bits,
1596 .maxlen = sizeof(mmap_rnd_bits),
1597 .mode = 0600,
1598 .proc_handler = proc_dointvec_minmax,
1599 .extra1 = (void *)&mmap_rnd_bits_min,
1600 .extra2 = (void *)&mmap_rnd_bits_max,
1601 },
1602 #endif
1603 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1604 {
1605 .procname = "mmap_rnd_compat_bits",
1606 .data = &mmap_rnd_compat_bits,
1607 .maxlen = sizeof(mmap_rnd_compat_bits),
1608 .mode = 0600,
1609 .proc_handler = proc_dointvec_minmax,
1610 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1611 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1612 },
1613 #endif
1614 { }
1615 };
1616
1617 static struct ctl_table fs_table[] = {
1618 {
1619 .procname = "inode-nr",
1620 .data = &inodes_stat,
1621 .maxlen = 2*sizeof(long),
1622 .mode = 0444,
1623 .proc_handler = proc_nr_inodes,
1624 },
1625 {
1626 .procname = "inode-state",
1627 .data = &inodes_stat,
1628 .maxlen = 7*sizeof(long),
1629 .mode = 0444,
1630 .proc_handler = proc_nr_inodes,
1631 },
1632 {
1633 .procname = "file-nr",
1634 .data = &files_stat,
1635 .maxlen = sizeof(files_stat),
1636 .mode = 0444,
1637 .proc_handler = proc_nr_files,
1638 },
1639 {
1640 .procname = "file-max",
1641 .data = &files_stat.max_files,
1642 .maxlen = sizeof(files_stat.max_files),
1643 .mode = 0644,
1644 .proc_handler = proc_doulongvec_minmax,
1645 },
1646 {
1647 .procname = "nr_open",
1648 .data = &sysctl_nr_open,
1649 .maxlen = sizeof(int),
1650 .mode = 0644,
1651 .proc_handler = proc_dointvec_minmax,
1652 .extra1 = &sysctl_nr_open_min,
1653 .extra2 = &sysctl_nr_open_max,
1654 },
1655 {
1656 .procname = "dentry-state",
1657 .data = &dentry_stat,
1658 .maxlen = 6*sizeof(long),
1659 .mode = 0444,
1660 .proc_handler = proc_nr_dentry,
1661 },
1662 {
1663 .procname = "overflowuid",
1664 .data = &fs_overflowuid,
1665 .maxlen = sizeof(int),
1666 .mode = 0644,
1667 .proc_handler = proc_dointvec_minmax,
1668 .extra1 = &minolduid,
1669 .extra2 = &maxolduid,
1670 },
1671 {
1672 .procname = "overflowgid",
1673 .data = &fs_overflowgid,
1674 .maxlen = sizeof(int),
1675 .mode = 0644,
1676 .proc_handler = proc_dointvec_minmax,
1677 .extra1 = &minolduid,
1678 .extra2 = &maxolduid,
1679 },
1680 #ifdef CONFIG_FILE_LOCKING
1681 {
1682 .procname = "leases-enable",
1683 .data = &leases_enable,
1684 .maxlen = sizeof(int),
1685 .mode = 0644,
1686 .proc_handler = proc_dointvec,
1687 },
1688 #endif
1689 #ifdef CONFIG_DNOTIFY
1690 {
1691 .procname = "dir-notify-enable",
1692 .data = &dir_notify_enable,
1693 .maxlen = sizeof(int),
1694 .mode = 0644,
1695 .proc_handler = proc_dointvec,
1696 },
1697 #endif
1698 #ifdef CONFIG_MMU
1699 #ifdef CONFIG_FILE_LOCKING
1700 {
1701 .procname = "lease-break-time",
1702 .data = &lease_break_time,
1703 .maxlen = sizeof(int),
1704 .mode = 0644,
1705 .proc_handler = proc_dointvec,
1706 },
1707 #endif
1708 #ifdef CONFIG_AIO
1709 {
1710 .procname = "aio-nr",
1711 .data = &aio_nr,
1712 .maxlen = sizeof(aio_nr),
1713 .mode = 0444,
1714 .proc_handler = proc_doulongvec_minmax,
1715 },
1716 {
1717 .procname = "aio-max-nr",
1718 .data = &aio_max_nr,
1719 .maxlen = sizeof(aio_max_nr),
1720 .mode = 0644,
1721 .proc_handler = proc_doulongvec_minmax,
1722 },
1723 #endif /* CONFIG_AIO */
1724 #ifdef CONFIG_INOTIFY_USER
1725 {
1726 .procname = "inotify",
1727 .mode = 0555,
1728 .child = inotify_table,
1729 },
1730 #endif
1731 #ifdef CONFIG_EPOLL
1732 {
1733 .procname = "epoll",
1734 .mode = 0555,
1735 .child = epoll_table,
1736 },
1737 #endif
1738 #endif
1739 {
1740 .procname = "protected_symlinks",
1741 .data = &sysctl_protected_symlinks,
1742 .maxlen = sizeof(int),
1743 .mode = 0600,
1744 .proc_handler = proc_dointvec_minmax,
1745 .extra1 = &zero,
1746 .extra2 = &one,
1747 },
1748 {
1749 .procname = "protected_hardlinks",
1750 .data = &sysctl_protected_hardlinks,
1751 .maxlen = sizeof(int),
1752 .mode = 0600,
1753 .proc_handler = proc_dointvec_minmax,
1754 .extra1 = &zero,
1755 .extra2 = &one,
1756 },
1757 {
1758 .procname = "suid_dumpable",
1759 .data = &suid_dumpable,
1760 .maxlen = sizeof(int),
1761 .mode = 0644,
1762 .proc_handler = proc_dointvec_minmax_coredump,
1763 .extra1 = &zero,
1764 .extra2 = &two,
1765 },
1766 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1767 {
1768 .procname = "binfmt_misc",
1769 .mode = 0555,
1770 .child = sysctl_mount_point,
1771 },
1772 #endif
1773 {
1774 .procname = "pipe-max-size",
1775 .data = &pipe_max_size,
1776 .maxlen = sizeof(int),
1777 .mode = 0644,
1778 .proc_handler = &pipe_proc_fn,
1779 .extra1 = &pipe_min_size,
1780 },
1781 {
1782 .procname = "pipe-user-pages-hard",
1783 .data = &pipe_user_pages_hard,
1784 .maxlen = sizeof(pipe_user_pages_hard),
1785 .mode = 0644,
1786 .proc_handler = proc_doulongvec_minmax,
1787 },
1788 {
1789 .procname = "pipe-user-pages-soft",
1790 .data = &pipe_user_pages_soft,
1791 .maxlen = sizeof(pipe_user_pages_soft),
1792 .mode = 0644,
1793 .proc_handler = proc_doulongvec_minmax,
1794 },
1795 { }
1796 };
1797
1798 static struct ctl_table debug_table[] = {
1799 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1800 {
1801 .procname = "exception-trace",
1802 .data = &show_unhandled_signals,
1803 .maxlen = sizeof(int),
1804 .mode = 0644,
1805 .proc_handler = proc_dointvec
1806 },
1807 #endif
1808 #if defined(CONFIG_OPTPROBES)
1809 {
1810 .procname = "kprobes-optimization",
1811 .data = &sysctl_kprobes_optimization,
1812 .maxlen = sizeof(int),
1813 .mode = 0644,
1814 .proc_handler = proc_kprobes_optimization_handler,
1815 .extra1 = &zero,
1816 .extra2 = &one,
1817 },
1818 #endif
1819 { }
1820 };
1821
1822 static struct ctl_table dev_table[] = {
1823 { }
1824 };
1825
1826 int __init sysctl_init(void)
1827 {
1828 struct ctl_table_header *hdr;
1829
1830 hdr = register_sysctl_table(sysctl_base_table);
1831 kmemleak_not_leak(hdr);
1832 return 0;
1833 }
1834
1835 #endif /* CONFIG_SYSCTL */
1836
1837 /*
1838 * /proc/sys support
1839 */
1840
1841 #ifdef CONFIG_PROC_SYSCTL
1842
1843 static int _proc_do_string(char *data, int maxlen, int write,
1844 char __user *buffer,
1845 size_t *lenp, loff_t *ppos)
1846 {
1847 size_t len;
1848 char __user *p;
1849 char c;
1850
1851 if (!data || !maxlen || !*lenp) {
1852 *lenp = 0;
1853 return 0;
1854 }
1855
1856 if (write) {
1857 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1858 /* Only continue writes not past the end of buffer. */
1859 len = strlen(data);
1860 if (len > maxlen - 1)
1861 len = maxlen - 1;
1862
1863 if (*ppos > len)
1864 return 0;
1865 len = *ppos;
1866 } else {
1867 /* Start writing from beginning of buffer. */
1868 len = 0;
1869 }
1870
1871 *ppos += *lenp;
1872 p = buffer;
1873 while ((p - buffer) < *lenp && len < maxlen - 1) {
1874 if (get_user(c, p++))
1875 return -EFAULT;
1876 if (c == 0 || c == '\n')
1877 break;
1878 data[len++] = c;
1879 }
1880 data[len] = 0;
1881 } else {
1882 len = strlen(data);
1883 if (len > maxlen)
1884 len = maxlen;
1885
1886 if (*ppos > len) {
1887 *lenp = 0;
1888 return 0;
1889 }
1890
1891 data += *ppos;
1892 len -= *ppos;
1893
1894 if (len > *lenp)
1895 len = *lenp;
1896 if (len)
1897 if (copy_to_user(buffer, data, len))
1898 return -EFAULT;
1899 if (len < *lenp) {
1900 if (put_user('\n', buffer + len))
1901 return -EFAULT;
1902 len++;
1903 }
1904 *lenp = len;
1905 *ppos += len;
1906 }
1907 return 0;
1908 }
1909
1910 static void warn_sysctl_write(struct ctl_table *table)
1911 {
1912 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1913 "This will not be supported in the future. To silence this\n"
1914 "warning, set kernel.sysctl_writes_strict = -1\n",
1915 current->comm, table->procname);
1916 }
1917
1918 /**
1919 * proc_dostring - read a string sysctl
1920 * @table: the sysctl table
1921 * @write: %TRUE if this is a write to the sysctl file
1922 * @buffer: the user buffer
1923 * @lenp: the size of the user buffer
1924 * @ppos: file position
1925 *
1926 * Reads/writes a string from/to the user buffer. If the kernel
1927 * buffer provided is not large enough to hold the string, the
1928 * string is truncated. The copied string is %NULL-terminated.
1929 * If the string is being read by the user process, it is copied
1930 * and a newline '\n' is added. It is truncated if the buffer is
1931 * not large enough.
1932 *
1933 * Returns 0 on success.
1934 */
1935 int proc_dostring(struct ctl_table *table, int write,
1936 void __user *buffer, size_t *lenp, loff_t *ppos)
1937 {
1938 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1939 warn_sysctl_write(table);
1940
1941 return _proc_do_string((char *)(table->data), table->maxlen, write,
1942 (char __user *)buffer, lenp, ppos);
1943 }
1944
1945 static size_t proc_skip_spaces(char **buf)
1946 {
1947 size_t ret;
1948 char *tmp = skip_spaces(*buf);
1949 ret = tmp - *buf;
1950 *buf = tmp;
1951 return ret;
1952 }
1953
1954 static void proc_skip_char(char **buf, size_t *size, const char v)
1955 {
1956 while (*size) {
1957 if (**buf != v)
1958 break;
1959 (*size)--;
1960 (*buf)++;
1961 }
1962 }
1963
1964 #define TMPBUFLEN 22
1965 /**
1966 * proc_get_long - reads an ASCII formatted integer from a user buffer
1967 *
1968 * @buf: a kernel buffer
1969 * @size: size of the kernel buffer
1970 * @val: this is where the number will be stored
1971 * @neg: set to %TRUE if number is negative
1972 * @perm_tr: a vector which contains the allowed trailers
1973 * @perm_tr_len: size of the perm_tr vector
1974 * @tr: pointer to store the trailer character
1975 *
1976 * In case of success %0 is returned and @buf and @size are updated with
1977 * the amount of bytes read. If @tr is non-NULL and a trailing
1978 * character exists (size is non-zero after returning from this
1979 * function), @tr is updated with the trailing character.
1980 */
1981 static int proc_get_long(char **buf, size_t *size,
1982 unsigned long *val, bool *neg,
1983 const char *perm_tr, unsigned perm_tr_len, char *tr)
1984 {
1985 int len;
1986 char *p, tmp[TMPBUFLEN];
1987
1988 if (!*size)
1989 return -EINVAL;
1990
1991 len = *size;
1992 if (len > TMPBUFLEN - 1)
1993 len = TMPBUFLEN - 1;
1994
1995 memcpy(tmp, *buf, len);
1996
1997 tmp[len] = 0;
1998 p = tmp;
1999 if (*p == '-' && *size > 1) {
2000 *neg = true;
2001 p++;
2002 } else
2003 *neg = false;
2004 if (!isdigit(*p))
2005 return -EINVAL;
2006
2007 *val = simple_strtoul(p, &p, 0);
2008
2009 len = p - tmp;
2010
2011 /* We don't know if the next char is whitespace thus we may accept
2012 * invalid integers (e.g. 1234...a) or two integers instead of one
2013 * (e.g. 123...1). So lets not allow such large numbers. */
2014 if (len == TMPBUFLEN - 1)
2015 return -EINVAL;
2016
2017 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2018 return -EINVAL;
2019
2020 if (tr && (len < *size))
2021 *tr = *p;
2022
2023 *buf += len;
2024 *size -= len;
2025
2026 return 0;
2027 }
2028
2029 /**
2030 * proc_put_long - converts an integer to a decimal ASCII formatted string
2031 *
2032 * @buf: the user buffer
2033 * @size: the size of the user buffer
2034 * @val: the integer to be converted
2035 * @neg: sign of the number, %TRUE for negative
2036 *
2037 * In case of success %0 is returned and @buf and @size are updated with
2038 * the amount of bytes written.
2039 */
2040 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2041 bool neg)
2042 {
2043 int len;
2044 char tmp[TMPBUFLEN], *p = tmp;
2045
2046 sprintf(p, "%s%lu", neg ? "-" : "", val);
2047 len = strlen(tmp);
2048 if (len > *size)
2049 len = *size;
2050 if (copy_to_user(*buf, tmp, len))
2051 return -EFAULT;
2052 *size -= len;
2053 *buf += len;
2054 return 0;
2055 }
2056 #undef TMPBUFLEN
2057
2058 static int proc_put_char(void __user **buf, size_t *size, char c)
2059 {
2060 if (*size) {
2061 char __user **buffer = (char __user **)buf;
2062 if (put_user(c, *buffer))
2063 return -EFAULT;
2064 (*size)--, (*buffer)++;
2065 *buf = *buffer;
2066 }
2067 return 0;
2068 }
2069
2070 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2071 int *valp,
2072 int write, void *data)
2073 {
2074 if (write) {
2075 if (*negp) {
2076 if (*lvalp > (unsigned long) INT_MAX + 1)
2077 return -EINVAL;
2078 *valp = -*lvalp;
2079 } else {
2080 if (*lvalp > (unsigned long) INT_MAX)
2081 return -EINVAL;
2082 *valp = *lvalp;
2083 }
2084 } else {
2085 int val = *valp;
2086 if (val < 0) {
2087 *negp = true;
2088 *lvalp = -(unsigned long)val;
2089 } else {
2090 *negp = false;
2091 *lvalp = (unsigned long)val;
2092 }
2093 }
2094 return 0;
2095 }
2096
2097 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2098
2099 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2100 int write, void __user *buffer,
2101 size_t *lenp, loff_t *ppos,
2102 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2103 int write, void *data),
2104 void *data)
2105 {
2106 int *i, vleft, first = 1, err = 0;
2107 size_t left;
2108 char *kbuf = NULL, *p;
2109
2110 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2111 *lenp = 0;
2112 return 0;
2113 }
2114
2115 i = (int *) tbl_data;
2116 vleft = table->maxlen / sizeof(*i);
2117 left = *lenp;
2118
2119 if (!conv)
2120 conv = do_proc_dointvec_conv;
2121
2122 if (write) {
2123 if (*ppos) {
2124 switch (sysctl_writes_strict) {
2125 case SYSCTL_WRITES_STRICT:
2126 goto out;
2127 case SYSCTL_WRITES_WARN:
2128 warn_sysctl_write(table);
2129 break;
2130 default:
2131 break;
2132 }
2133 }
2134
2135 if (left > PAGE_SIZE - 1)
2136 left = PAGE_SIZE - 1;
2137 p = kbuf = memdup_user_nul(buffer, left);
2138 if (IS_ERR(kbuf))
2139 return PTR_ERR(kbuf);
2140 }
2141
2142 for (; left && vleft--; i++, first=0) {
2143 unsigned long lval;
2144 bool neg;
2145
2146 if (write) {
2147 left -= proc_skip_spaces(&p);
2148
2149 if (!left)
2150 break;
2151 err = proc_get_long(&p, &left, &lval, &neg,
2152 proc_wspace_sep,
2153 sizeof(proc_wspace_sep), NULL);
2154 if (err)
2155 break;
2156 if (conv(&neg, &lval, i, 1, data)) {
2157 err = -EINVAL;
2158 break;
2159 }
2160 } else {
2161 if (conv(&neg, &lval, i, 0, data)) {
2162 err = -EINVAL;
2163 break;
2164 }
2165 if (!first)
2166 err = proc_put_char(&buffer, &left, '\t');
2167 if (err)
2168 break;
2169 err = proc_put_long(&buffer, &left, lval, neg);
2170 if (err)
2171 break;
2172 }
2173 }
2174
2175 if (!write && !first && left && !err)
2176 err = proc_put_char(&buffer, &left, '\n');
2177 if (write && !err && left)
2178 left -= proc_skip_spaces(&p);
2179 if (write) {
2180 kfree(kbuf);
2181 if (first)
2182 return err ? : -EINVAL;
2183 }
2184 *lenp -= left;
2185 out:
2186 *ppos += *lenp;
2187 return err;
2188 }
2189
2190 static int do_proc_dointvec(struct ctl_table *table, int write,
2191 void __user *buffer, size_t *lenp, loff_t *ppos,
2192 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2193 int write, void *data),
2194 void *data)
2195 {
2196 return __do_proc_dointvec(table->data, table, write,
2197 buffer, lenp, ppos, conv, data);
2198 }
2199
2200 /**
2201 * proc_dointvec - read a vector of integers
2202 * @table: the sysctl table
2203 * @write: %TRUE if this is a write to the sysctl file
2204 * @buffer: the user buffer
2205 * @lenp: the size of the user buffer
2206 * @ppos: file position
2207 *
2208 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2209 * values from/to the user buffer, treated as an ASCII string.
2210 *
2211 * Returns 0 on success.
2212 */
2213 int proc_dointvec(struct ctl_table *table, int write,
2214 void __user *buffer, size_t *lenp, loff_t *ppos)
2215 {
2216 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2217 NULL,NULL);
2218 }
2219
2220 /*
2221 * Taint values can only be increased
2222 * This means we can safely use a temporary.
2223 */
2224 static int proc_taint(struct ctl_table *table, int write,
2225 void __user *buffer, size_t *lenp, loff_t *ppos)
2226 {
2227 struct ctl_table t;
2228 unsigned long tmptaint = get_taint();
2229 int err;
2230
2231 if (write && !capable(CAP_SYS_ADMIN))
2232 return -EPERM;
2233
2234 t = *table;
2235 t.data = &tmptaint;
2236 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2237 if (err < 0)
2238 return err;
2239
2240 if (write) {
2241 /*
2242 * Poor man's atomic or. Not worth adding a primitive
2243 * to everyone's atomic.h for this
2244 */
2245 int i;
2246 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2247 if ((tmptaint >> i) & 1)
2248 add_taint(i, LOCKDEP_STILL_OK);
2249 }
2250 }
2251
2252 return err;
2253 }
2254
2255 #ifdef CONFIG_PRINTK
2256 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2257 void __user *buffer, size_t *lenp, loff_t *ppos)
2258 {
2259 if (write && !capable(CAP_SYS_ADMIN))
2260 return -EPERM;
2261
2262 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2263 }
2264 #endif
2265
2266 struct do_proc_dointvec_minmax_conv_param {
2267 int *min;
2268 int *max;
2269 };
2270
2271 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2272 int *valp,
2273 int write, void *data)
2274 {
2275 struct do_proc_dointvec_minmax_conv_param *param = data;
2276 if (write) {
2277 int val = *negp ? -*lvalp : *lvalp;
2278 if ((param->min && *param->min > val) ||
2279 (param->max && *param->max < val))
2280 return -EINVAL;
2281 *valp = val;
2282 } else {
2283 int val = *valp;
2284 if (val < 0) {
2285 *negp = true;
2286 *lvalp = -(unsigned long)val;
2287 } else {
2288 *negp = false;
2289 *lvalp = (unsigned long)val;
2290 }
2291 }
2292 return 0;
2293 }
2294
2295 /**
2296 * proc_dointvec_minmax - read a vector of integers with min/max values
2297 * @table: the sysctl table
2298 * @write: %TRUE if this is a write to the sysctl file
2299 * @buffer: the user buffer
2300 * @lenp: the size of the user buffer
2301 * @ppos: file position
2302 *
2303 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2304 * values from/to the user buffer, treated as an ASCII string.
2305 *
2306 * This routine will ensure the values are within the range specified by
2307 * table->extra1 (min) and table->extra2 (max).
2308 *
2309 * Returns 0 on success.
2310 */
2311 int proc_dointvec_minmax(struct ctl_table *table, int write,
2312 void __user *buffer, size_t *lenp, loff_t *ppos)
2313 {
2314 struct do_proc_dointvec_minmax_conv_param param = {
2315 .min = (int *) table->extra1,
2316 .max = (int *) table->extra2,
2317 };
2318 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2319 do_proc_dointvec_minmax_conv, &param);
2320 }
2321
2322 static void validate_coredump_safety(void)
2323 {
2324 #ifdef CONFIG_COREDUMP
2325 if (suid_dumpable == SUID_DUMP_ROOT &&
2326 core_pattern[0] != '/' && core_pattern[0] != '|') {
2327 printk(KERN_WARNING "Unsafe core_pattern used with "\
2328 "suid_dumpable=2. Pipe handler or fully qualified "\
2329 "core dump path required.\n");
2330 }
2331 #endif
2332 }
2333
2334 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2335 void __user *buffer, size_t *lenp, loff_t *ppos)
2336 {
2337 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2338 if (!error)
2339 validate_coredump_safety();
2340 return error;
2341 }
2342
2343 #ifdef CONFIG_COREDUMP
2344 static int proc_dostring_coredump(struct ctl_table *table, int write,
2345 void __user *buffer, size_t *lenp, loff_t *ppos)
2346 {
2347 int error = proc_dostring(table, write, buffer, lenp, ppos);
2348 if (!error)
2349 validate_coredump_safety();
2350 return error;
2351 }
2352 #endif
2353
2354 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2355 void __user *buffer,
2356 size_t *lenp, loff_t *ppos,
2357 unsigned long convmul,
2358 unsigned long convdiv)
2359 {
2360 unsigned long *i, *min, *max;
2361 int vleft, first = 1, err = 0;
2362 size_t left;
2363 char *kbuf = NULL, *p;
2364
2365 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2366 *lenp = 0;
2367 return 0;
2368 }
2369
2370 i = (unsigned long *) data;
2371 min = (unsigned long *) table->extra1;
2372 max = (unsigned long *) table->extra2;
2373 vleft = table->maxlen / sizeof(unsigned long);
2374 left = *lenp;
2375
2376 if (write) {
2377 if (*ppos) {
2378 switch (sysctl_writes_strict) {
2379 case SYSCTL_WRITES_STRICT:
2380 goto out;
2381 case SYSCTL_WRITES_WARN:
2382 warn_sysctl_write(table);
2383 break;
2384 default:
2385 break;
2386 }
2387 }
2388
2389 if (left > PAGE_SIZE - 1)
2390 left = PAGE_SIZE - 1;
2391 p = kbuf = memdup_user_nul(buffer, left);
2392 if (IS_ERR(kbuf))
2393 return PTR_ERR(kbuf);
2394 }
2395
2396 for (; left && vleft--; i++, first = 0) {
2397 unsigned long val;
2398
2399 if (write) {
2400 bool neg;
2401
2402 left -= proc_skip_spaces(&p);
2403
2404 err = proc_get_long(&p, &left, &val, &neg,
2405 proc_wspace_sep,
2406 sizeof(proc_wspace_sep), NULL);
2407 if (err)
2408 break;
2409 if (neg)
2410 continue;
2411 if ((min && val < *min) || (max && val > *max))
2412 continue;
2413 *i = val;
2414 } else {
2415 val = convdiv * (*i) / convmul;
2416 if (!first) {
2417 err = proc_put_char(&buffer, &left, '\t');
2418 if (err)
2419 break;
2420 }
2421 err = proc_put_long(&buffer, &left, val, false);
2422 if (err)
2423 break;
2424 }
2425 }
2426
2427 if (!write && !first && left && !err)
2428 err = proc_put_char(&buffer, &left, '\n');
2429 if (write && !err)
2430 left -= proc_skip_spaces(&p);
2431 if (write) {
2432 kfree(kbuf);
2433 if (first)
2434 return err ? : -EINVAL;
2435 }
2436 *lenp -= left;
2437 out:
2438 *ppos += *lenp;
2439 return err;
2440 }
2441
2442 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2443 void __user *buffer,
2444 size_t *lenp, loff_t *ppos,
2445 unsigned long convmul,
2446 unsigned long convdiv)
2447 {
2448 return __do_proc_doulongvec_minmax(table->data, table, write,
2449 buffer, lenp, ppos, convmul, convdiv);
2450 }
2451
2452 /**
2453 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2454 * @table: the sysctl table
2455 * @write: %TRUE if this is a write to the sysctl file
2456 * @buffer: the user buffer
2457 * @lenp: the size of the user buffer
2458 * @ppos: file position
2459 *
2460 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2461 * values from/to the user buffer, treated as an ASCII string.
2462 *
2463 * This routine will ensure the values are within the range specified by
2464 * table->extra1 (min) and table->extra2 (max).
2465 *
2466 * Returns 0 on success.
2467 */
2468 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2469 void __user *buffer, size_t *lenp, loff_t *ppos)
2470 {
2471 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2472 }
2473
2474 /**
2475 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2476 * @table: the sysctl table
2477 * @write: %TRUE if this is a write to the sysctl file
2478 * @buffer: the user buffer
2479 * @lenp: the size of the user buffer
2480 * @ppos: file position
2481 *
2482 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2483 * values from/to the user buffer, treated as an ASCII string. The values
2484 * are treated as milliseconds, and converted to jiffies when they are stored.
2485 *
2486 * This routine will ensure the values are within the range specified by
2487 * table->extra1 (min) and table->extra2 (max).
2488 *
2489 * Returns 0 on success.
2490 */
2491 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2492 void __user *buffer,
2493 size_t *lenp, loff_t *ppos)
2494 {
2495 return do_proc_doulongvec_minmax(table, write, buffer,
2496 lenp, ppos, HZ, 1000l);
2497 }
2498
2499
2500 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2501 int *valp,
2502 int write, void *data)
2503 {
2504 if (write) {
2505 if (*lvalp > LONG_MAX / HZ)
2506 return 1;
2507 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2508 } else {
2509 int val = *valp;
2510 unsigned long lval;
2511 if (val < 0) {
2512 *negp = true;
2513 lval = -(unsigned long)val;
2514 } else {
2515 *negp = false;
2516 lval = (unsigned long)val;
2517 }
2518 *lvalp = lval / HZ;
2519 }
2520 return 0;
2521 }
2522
2523 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2524 int *valp,
2525 int write, void *data)
2526 {
2527 if (write) {
2528 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2529 return 1;
2530 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2531 } else {
2532 int val = *valp;
2533 unsigned long lval;
2534 if (val < 0) {
2535 *negp = true;
2536 lval = -(unsigned long)val;
2537 } else {
2538 *negp = false;
2539 lval = (unsigned long)val;
2540 }
2541 *lvalp = jiffies_to_clock_t(lval);
2542 }
2543 return 0;
2544 }
2545
2546 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2547 int *valp,
2548 int write, void *data)
2549 {
2550 if (write) {
2551 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2552
2553 if (jif > INT_MAX)
2554 return 1;
2555 *valp = (int)jif;
2556 } else {
2557 int val = *valp;
2558 unsigned long lval;
2559 if (val < 0) {
2560 *negp = true;
2561 lval = -(unsigned long)val;
2562 } else {
2563 *negp = false;
2564 lval = (unsigned long)val;
2565 }
2566 *lvalp = jiffies_to_msecs(lval);
2567 }
2568 return 0;
2569 }
2570
2571 /**
2572 * proc_dointvec_jiffies - read a vector of integers as seconds
2573 * @table: the sysctl table
2574 * @write: %TRUE if this is a write to the sysctl file
2575 * @buffer: the user buffer
2576 * @lenp: the size of the user buffer
2577 * @ppos: file position
2578 *
2579 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2580 * values from/to the user buffer, treated as an ASCII string.
2581 * The values read are assumed to be in seconds, and are converted into
2582 * jiffies.
2583 *
2584 * Returns 0 on success.
2585 */
2586 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2587 void __user *buffer, size_t *lenp, loff_t *ppos)
2588 {
2589 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2590 do_proc_dointvec_jiffies_conv,NULL);
2591 }
2592
2593 /**
2594 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2595 * @table: the sysctl table
2596 * @write: %TRUE if this is a write to the sysctl file
2597 * @buffer: the user buffer
2598 * @lenp: the size of the user buffer
2599 * @ppos: pointer to the file position
2600 *
2601 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2602 * values from/to the user buffer, treated as an ASCII string.
2603 * The values read are assumed to be in 1/USER_HZ seconds, and
2604 * are converted into jiffies.
2605 *
2606 * Returns 0 on success.
2607 */
2608 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2609 void __user *buffer, size_t *lenp, loff_t *ppos)
2610 {
2611 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2612 do_proc_dointvec_userhz_jiffies_conv,NULL);
2613 }
2614
2615 /**
2616 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2617 * @table: the sysctl table
2618 * @write: %TRUE if this is a write to the sysctl file
2619 * @buffer: the user buffer
2620 * @lenp: the size of the user buffer
2621 * @ppos: file position
2622 * @ppos: the current position in the file
2623 *
2624 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2625 * values from/to the user buffer, treated as an ASCII string.
2626 * The values read are assumed to be in 1/1000 seconds, and
2627 * are converted into jiffies.
2628 *
2629 * Returns 0 on success.
2630 */
2631 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2632 void __user *buffer, size_t *lenp, loff_t *ppos)
2633 {
2634 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2635 do_proc_dointvec_ms_jiffies_conv, NULL);
2636 }
2637
2638 static int proc_do_cad_pid(struct ctl_table *table, int write,
2639 void __user *buffer, size_t *lenp, loff_t *ppos)
2640 {
2641 struct pid *new_pid;
2642 pid_t tmp;
2643 int r;
2644
2645 tmp = pid_vnr(cad_pid);
2646
2647 r = __do_proc_dointvec(&tmp, table, write, buffer,
2648 lenp, ppos, NULL, NULL);
2649 if (r || !write)
2650 return r;
2651
2652 new_pid = find_get_pid(tmp);
2653 if (!new_pid)
2654 return -ESRCH;
2655
2656 put_pid(xchg(&cad_pid, new_pid));
2657 return 0;
2658 }
2659
2660 /**
2661 * proc_do_large_bitmap - read/write from/to a large bitmap
2662 * @table: the sysctl table
2663 * @write: %TRUE if this is a write to the sysctl file
2664 * @buffer: the user buffer
2665 * @lenp: the size of the user buffer
2666 * @ppos: file position
2667 *
2668 * The bitmap is stored at table->data and the bitmap length (in bits)
2669 * in table->maxlen.
2670 *
2671 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2672 * large bitmaps may be represented in a compact manner. Writing into
2673 * the file will clear the bitmap then update it with the given input.
2674 *
2675 * Returns 0 on success.
2676 */
2677 int proc_do_large_bitmap(struct ctl_table *table, int write,
2678 void __user *buffer, size_t *lenp, loff_t *ppos)
2679 {
2680 int err = 0;
2681 bool first = 1;
2682 size_t left = *lenp;
2683 unsigned long bitmap_len = table->maxlen;
2684 unsigned long *bitmap = *(unsigned long **) table->data;
2685 unsigned long *tmp_bitmap = NULL;
2686 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2687
2688 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2689 *lenp = 0;
2690 return 0;
2691 }
2692
2693 if (write) {
2694 char *kbuf, *p;
2695
2696 if (left > PAGE_SIZE - 1)
2697 left = PAGE_SIZE - 1;
2698
2699 p = kbuf = memdup_user_nul(buffer, left);
2700 if (IS_ERR(kbuf))
2701 return PTR_ERR(kbuf);
2702
2703 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2704 GFP_KERNEL);
2705 if (!tmp_bitmap) {
2706 kfree(kbuf);
2707 return -ENOMEM;
2708 }
2709 proc_skip_char(&p, &left, '\n');
2710 while (!err && left) {
2711 unsigned long val_a, val_b;
2712 bool neg;
2713
2714 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2715 sizeof(tr_a), &c);
2716 if (err)
2717 break;
2718 if (val_a >= bitmap_len || neg) {
2719 err = -EINVAL;
2720 break;
2721 }
2722
2723 val_b = val_a;
2724 if (left) {
2725 p++;
2726 left--;
2727 }
2728
2729 if (c == '-') {
2730 err = proc_get_long(&p, &left, &val_b,
2731 &neg, tr_b, sizeof(tr_b),
2732 &c);
2733 if (err)
2734 break;
2735 if (val_b >= bitmap_len || neg ||
2736 val_a > val_b) {
2737 err = -EINVAL;
2738 break;
2739 }
2740 if (left) {
2741 p++;
2742 left--;
2743 }
2744 }
2745
2746 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2747 first = 0;
2748 proc_skip_char(&p, &left, '\n');
2749 }
2750 kfree(kbuf);
2751 } else {
2752 unsigned long bit_a, bit_b = 0;
2753
2754 while (left) {
2755 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2756 if (bit_a >= bitmap_len)
2757 break;
2758 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2759 bit_a + 1) - 1;
2760
2761 if (!first) {
2762 err = proc_put_char(&buffer, &left, ',');
2763 if (err)
2764 break;
2765 }
2766 err = proc_put_long(&buffer, &left, bit_a, false);
2767 if (err)
2768 break;
2769 if (bit_a != bit_b) {
2770 err = proc_put_char(&buffer, &left, '-');
2771 if (err)
2772 break;
2773 err = proc_put_long(&buffer, &left, bit_b, false);
2774 if (err)
2775 break;
2776 }
2777
2778 first = 0; bit_b++;
2779 }
2780 if (!err)
2781 err = proc_put_char(&buffer, &left, '\n');
2782 }
2783
2784 if (!err) {
2785 if (write) {
2786 if (*ppos)
2787 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2788 else
2789 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2790 }
2791 kfree(tmp_bitmap);
2792 *lenp -= left;
2793 *ppos += *lenp;
2794 return 0;
2795 } else {
2796 kfree(tmp_bitmap);
2797 return err;
2798 }
2799 }
2800
2801 #else /* CONFIG_PROC_SYSCTL */
2802
2803 int proc_dostring(struct ctl_table *table, int write,
2804 void __user *buffer, size_t *lenp, loff_t *ppos)
2805 {
2806 return -ENOSYS;
2807 }
2808
2809 int proc_dointvec(struct ctl_table *table, int write,
2810 void __user *buffer, size_t *lenp, loff_t *ppos)
2811 {
2812 return -ENOSYS;
2813 }
2814
2815 int proc_dointvec_minmax(struct ctl_table *table, int write,
2816 void __user *buffer, size_t *lenp, loff_t *ppos)
2817 {
2818 return -ENOSYS;
2819 }
2820
2821 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2822 void __user *buffer, size_t *lenp, loff_t *ppos)
2823 {
2824 return -ENOSYS;
2825 }
2826
2827 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2828 void __user *buffer, size_t *lenp, loff_t *ppos)
2829 {
2830 return -ENOSYS;
2831 }
2832
2833 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2834 void __user *buffer, size_t *lenp, loff_t *ppos)
2835 {
2836 return -ENOSYS;
2837 }
2838
2839 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2840 void __user *buffer, size_t *lenp, loff_t *ppos)
2841 {
2842 return -ENOSYS;
2843 }
2844
2845 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2846 void __user *buffer,
2847 size_t *lenp, loff_t *ppos)
2848 {
2849 return -ENOSYS;
2850 }
2851
2852
2853 #endif /* CONFIG_PROC_SYSCTL */
2854
2855 /*
2856 * No sense putting this after each symbol definition, twice,
2857 * exception granted :-)
2858 */
2859 EXPORT_SYMBOL(proc_dointvec);
2860 EXPORT_SYMBOL(proc_dointvec_jiffies);
2861 EXPORT_SYMBOL(proc_dointvec_minmax);
2862 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2863 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2864 EXPORT_SYMBOL(proc_dostring);
2865 EXPORT_SYMBOL(proc_doulongvec_minmax);
2866 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux kernel - Deliverables
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