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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/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 #include <linux/mount.h>
69
70 #include <asm/uaccess.h>
71 #include <asm/processor.h>
72
73 #ifdef CONFIG_X86
74 #include <asm/nmi.h>
75 #include <asm/stacktrace.h>
76 #include <asm/io.h>
77 #endif
78 #ifdef CONFIG_SPARC
79 #include <asm/setup.h>
80 #endif
81 #ifdef CONFIG_BSD_PROCESS_ACCT
82 #include <linux/acct.h>
83 #endif
84 #ifdef CONFIG_RT_MUTEXES
85 #include <linux/rtmutex.h>
86 #endif
87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88 #include <linux/lockdep.h>
89 #endif
90 #ifdef CONFIG_CHR_DEV_SG
91 #include <scsi/sg.h>
92 #endif
93
94 #ifdef CONFIG_LOCKUP_DETECTOR
95 #include <linux/nmi.h>
96 #endif
97
98 #if defined(CONFIG_SYSCTL)
99
100 /* External variables not in a header file. */
101 extern int suid_dumpable;
102 #ifdef CONFIG_COREDUMP
103 extern int core_uses_pid;
104 extern char core_pattern[];
105 extern unsigned int core_pipe_limit;
106 #endif
107 extern int pid_max;
108 extern int pid_max_min, pid_max_max;
109 extern int percpu_pagelist_fraction;
110 extern int latencytop_enabled;
111 extern unsigned 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 #ifdef CONFIG_PERF_EVENTS
134 static int six_hundred_forty_kb = 640 * 1024;
135 #endif
136
137 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
138 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
139
140 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
141 static int maxolduid = 65535;
142 static int minolduid;
143
144 static int ngroups_max = NGROUPS_MAX;
145 static const int cap_last_cap = CAP_LAST_CAP;
146
147 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
148 #ifdef CONFIG_DETECT_HUNG_TASK
149 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
150 #endif
151
152 #ifdef CONFIG_INOTIFY_USER
153 #include <linux/inotify.h>
154 #endif
155 #ifdef CONFIG_SPARC
156 #endif
157
158 #ifdef __hppa__
159 extern int pwrsw_enabled;
160 #endif
161
162 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
163 extern int unaligned_enabled;
164 #endif
165
166 #ifdef CONFIG_IA64
167 extern int unaligned_dump_stack;
168 #endif
169
170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
171 extern int no_unaligned_warning;
172 #endif
173
174 #ifdef CONFIG_PROC_SYSCTL
175
176 #define SYSCTL_WRITES_LEGACY -1
177 #define SYSCTL_WRITES_WARN 0
178 #define SYSCTL_WRITES_STRICT 1
179
180 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
181
182 static int proc_do_cad_pid(struct ctl_table *table, int write,
183 void __user *buffer, size_t *lenp, loff_t *ppos);
184 static int proc_taint(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186 #endif
187
188 #ifdef CONFIG_PRINTK
189 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
191 #endif
192
193 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
194 void __user *buffer, size_t *lenp, loff_t *ppos);
195 #ifdef CONFIG_COREDUMP
196 static int proc_dostring_coredump(struct ctl_table *table, int write,
197 void __user *buffer, size_t *lenp, loff_t *ppos);
198 #endif
199
200 #ifdef CONFIG_MAGIC_SYSRQ
201 /* Note: sysrq code uses it's own private copy */
202 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
203
204 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
205 void __user *buffer, size_t *lenp,
206 loff_t *ppos)
207 {
208 int error;
209
210 error = proc_dointvec(table, write, buffer, lenp, ppos);
211 if (error)
212 return error;
213
214 if (write)
215 sysrq_toggle_support(__sysrq_enabled);
216
217 return 0;
218 }
219
220 #endif
221
222 static struct ctl_table kern_table[];
223 static struct ctl_table vm_table[];
224 static struct ctl_table fs_table[];
225 static struct ctl_table debug_table[];
226 static struct ctl_table dev_table[];
227 extern struct ctl_table random_table[];
228 #ifdef CONFIG_EPOLL
229 extern struct ctl_table epoll_table[];
230 #endif
231
232 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
233 int sysctl_legacy_va_layout;
234 #endif
235
236 /* The default sysctl tables: */
237
238 static struct ctl_table sysctl_base_table[] = {
239 {
240 .procname = "kernel",
241 .mode = 0555,
242 .child = kern_table,
243 },
244 {
245 .procname = "vm",
246 .mode = 0555,
247 .child = vm_table,
248 },
249 {
250 .procname = "fs",
251 .mode = 0555,
252 .child = fs_table,
253 },
254 {
255 .procname = "debug",
256 .mode = 0555,
257 .child = debug_table,
258 },
259 {
260 .procname = "dev",
261 .mode = 0555,
262 .child = dev_table,
263 },
264 { }
265 };
266
267 #ifdef CONFIG_SCHED_DEBUG
268 static int min_sched_granularity_ns = 100000; /* 100 usecs */
269 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
270 static int min_wakeup_granularity_ns; /* 0 usecs */
271 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
272 #ifdef CONFIG_SMP
273 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
274 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
275 #endif /* CONFIG_SMP */
276 #endif /* CONFIG_SCHED_DEBUG */
277
278 #ifdef CONFIG_COMPACTION
279 static int min_extfrag_threshold;
280 static int max_extfrag_threshold = 1000;
281 #endif
282
283 static struct ctl_table kern_table[] = {
284 {
285 .procname = "sched_child_runs_first",
286 .data = &sysctl_sched_child_runs_first,
287 .maxlen = sizeof(unsigned int),
288 .mode = 0644,
289 .proc_handler = proc_dointvec,
290 },
291 #ifdef CONFIG_SCHED_DEBUG
292 {
293 .procname = "sched_min_granularity_ns",
294 .data = &sysctl_sched_min_granularity,
295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
297 .proc_handler = sched_proc_update_handler,
298 .extra1 = &min_sched_granularity_ns,
299 .extra2 = &max_sched_granularity_ns,
300 },
301 {
302 .procname = "sched_latency_ns",
303 .data = &sysctl_sched_latency,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
306 .proc_handler = sched_proc_update_handler,
307 .extra1 = &min_sched_granularity_ns,
308 .extra2 = &max_sched_granularity_ns,
309 },
310 {
311 .procname = "sched_wakeup_granularity_ns",
312 .data = &sysctl_sched_wakeup_granularity,
313 .maxlen = sizeof(unsigned int),
314 .mode = 0644,
315 .proc_handler = sched_proc_update_handler,
316 .extra1 = &min_wakeup_granularity_ns,
317 .extra2 = &max_wakeup_granularity_ns,
318 },
319 #ifdef CONFIG_SMP
320 {
321 .procname = "sched_tunable_scaling",
322 .data = &sysctl_sched_tunable_scaling,
323 .maxlen = sizeof(enum sched_tunable_scaling),
324 .mode = 0644,
325 .proc_handler = sched_proc_update_handler,
326 .extra1 = &min_sched_tunable_scaling,
327 .extra2 = &max_sched_tunable_scaling,
328 },
329 {
330 .procname = "sched_migration_cost_ns",
331 .data = &sysctl_sched_migration_cost,
332 .maxlen = sizeof(unsigned int),
333 .mode = 0644,
334 .proc_handler = proc_dointvec,
335 },
336 {
337 .procname = "sched_nr_migrate",
338 .data = &sysctl_sched_nr_migrate,
339 .maxlen = sizeof(unsigned int),
340 .mode = 0644,
341 .proc_handler = proc_dointvec,
342 },
343 {
344 .procname = "sched_time_avg_ms",
345 .data = &sysctl_sched_time_avg,
346 .maxlen = sizeof(unsigned int),
347 .mode = 0644,
348 .proc_handler = proc_dointvec,
349 },
350 {
351 .procname = "sched_shares_window_ns",
352 .data = &sysctl_sched_shares_window,
353 .maxlen = sizeof(unsigned int),
354 .mode = 0644,
355 .proc_handler = proc_dointvec,
356 },
357 #ifdef CONFIG_SCHEDSTATS
358 {
359 .procname = "sched_schedstats",
360 .data = NULL,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = sysctl_schedstats,
364 .extra1 = &zero,
365 .extra2 = &one,
366 },
367 #endif /* CONFIG_SCHEDSTATS */
368 #endif /* CONFIG_SMP */
369 #ifdef CONFIG_NUMA_BALANCING
370 {
371 .procname = "numa_balancing_scan_delay_ms",
372 .data = &sysctl_numa_balancing_scan_delay,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
377 {
378 .procname = "numa_balancing_scan_period_min_ms",
379 .data = &sysctl_numa_balancing_scan_period_min,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384 {
385 .procname = "numa_balancing_scan_period_max_ms",
386 .data = &sysctl_numa_balancing_scan_period_max,
387 .maxlen = sizeof(unsigned int),
388 .mode = 0644,
389 .proc_handler = proc_dointvec,
390 },
391 {
392 .procname = "numa_balancing_scan_size_mb",
393 .data = &sysctl_numa_balancing_scan_size,
394 .maxlen = sizeof(unsigned int),
395 .mode = 0644,
396 .proc_handler = proc_dointvec_minmax,
397 .extra1 = &one,
398 },
399 {
400 .procname = "numa_balancing",
401 .data = NULL, /* filled in by handler */
402 .maxlen = sizeof(unsigned int),
403 .mode = 0644,
404 .proc_handler = sysctl_numa_balancing,
405 .extra1 = &zero,
406 .extra2 = &one,
407 },
408 #endif /* CONFIG_NUMA_BALANCING */
409 #endif /* CONFIG_SCHED_DEBUG */
410 {
411 .procname = "sched_rt_period_us",
412 .data = &sysctl_sched_rt_period,
413 .maxlen = sizeof(unsigned int),
414 .mode = 0644,
415 .proc_handler = sched_rt_handler,
416 },
417 {
418 .procname = "sched_rt_runtime_us",
419 .data = &sysctl_sched_rt_runtime,
420 .maxlen = sizeof(int),
421 .mode = 0644,
422 .proc_handler = sched_rt_handler,
423 },
424 {
425 .procname = "sched_rr_timeslice_ms",
426 .data = &sched_rr_timeslice,
427 .maxlen = sizeof(int),
428 .mode = 0644,
429 .proc_handler = sched_rr_handler,
430 },
431 #ifdef CONFIG_SCHED_AUTOGROUP
432 {
433 .procname = "sched_autogroup_enabled",
434 .data = &sysctl_sched_autogroup_enabled,
435 .maxlen = sizeof(unsigned int),
436 .mode = 0644,
437 .proc_handler = proc_dointvec_minmax,
438 .extra1 = &zero,
439 .extra2 = &one,
440 },
441 #endif
442 #ifdef CONFIG_CFS_BANDWIDTH
443 {
444 .procname = "sched_cfs_bandwidth_slice_us",
445 .data = &sysctl_sched_cfs_bandwidth_slice,
446 .maxlen = sizeof(unsigned int),
447 .mode = 0644,
448 .proc_handler = proc_dointvec_minmax,
449 .extra1 = &one,
450 },
451 #endif
452 #ifdef CONFIG_PROVE_LOCKING
453 {
454 .procname = "prove_locking",
455 .data = &prove_locking,
456 .maxlen = sizeof(int),
457 .mode = 0644,
458 .proc_handler = proc_dointvec,
459 },
460 #endif
461 #ifdef CONFIG_LOCK_STAT
462 {
463 .procname = "lock_stat",
464 .data = &lock_stat,
465 .maxlen = sizeof(int),
466 .mode = 0644,
467 .proc_handler = proc_dointvec,
468 },
469 #endif
470 {
471 .procname = "panic",
472 .data = &panic_timeout,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec,
476 },
477 #ifdef CONFIG_COREDUMP
478 {
479 .procname = "core_uses_pid",
480 .data = &core_uses_pid,
481 .maxlen = sizeof(int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec,
484 },
485 {
486 .procname = "core_pattern",
487 .data = core_pattern,
488 .maxlen = CORENAME_MAX_SIZE,
489 .mode = 0644,
490 .proc_handler = proc_dostring_coredump,
491 },
492 {
493 .procname = "core_pipe_limit",
494 .data = &core_pipe_limit,
495 .maxlen = sizeof(unsigned int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec,
498 },
499 #endif
500 #ifdef CONFIG_PROC_SYSCTL
501 {
502 .procname = "tainted",
503 .maxlen = sizeof(long),
504 .mode = 0644,
505 .proc_handler = proc_taint,
506 },
507 {
508 .procname = "sysctl_writes_strict",
509 .data = &sysctl_writes_strict,
510 .maxlen = sizeof(int),
511 .mode = 0644,
512 .proc_handler = proc_dointvec_minmax,
513 .extra1 = &neg_one,
514 .extra2 = &one,
515 },
516 #endif
517 #ifdef CONFIG_LATENCYTOP
518 {
519 .procname = "latencytop",
520 .data = &latencytop_enabled,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = sysctl_latencytop,
524 },
525 #endif
526 #ifdef CONFIG_BLK_DEV_INITRD
527 {
528 .procname = "real-root-dev",
529 .data = &real_root_dev,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec,
533 },
534 #endif
535 {
536 .procname = "print-fatal-signals",
537 .data = &print_fatal_signals,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 #ifdef CONFIG_SPARC
543 {
544 .procname = "reboot-cmd",
545 .data = reboot_command,
546 .maxlen = 256,
547 .mode = 0644,
548 .proc_handler = proc_dostring,
549 },
550 {
551 .procname = "stop-a",
552 .data = &stop_a_enabled,
553 .maxlen = sizeof (int),
554 .mode = 0644,
555 .proc_handler = proc_dointvec,
556 },
557 {
558 .procname = "scons-poweroff",
559 .data = &scons_pwroff,
560 .maxlen = sizeof (int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec,
563 },
564 #endif
565 #ifdef CONFIG_SPARC64
566 {
567 .procname = "tsb-ratio",
568 .data = &sysctl_tsb_ratio,
569 .maxlen = sizeof (int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec,
572 },
573 #endif
574 #ifdef __hppa__
575 {
576 .procname = "soft-power",
577 .data = &pwrsw_enabled,
578 .maxlen = sizeof (int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582 #endif
583 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
584 {
585 .procname = "unaligned-trap",
586 .data = &unaligned_enabled,
587 .maxlen = sizeof (int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec,
590 },
591 #endif
592 {
593 .procname = "ctrl-alt-del",
594 .data = &C_A_D,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec,
598 },
599 #ifdef CONFIG_FUNCTION_TRACER
600 {
601 .procname = "ftrace_enabled",
602 .data = &ftrace_enabled,
603 .maxlen = sizeof(int),
604 .mode = 0644,
605 .proc_handler = ftrace_enable_sysctl,
606 },
607 #endif
608 #ifdef CONFIG_STACK_TRACER
609 {
610 .procname = "stack_tracer_enabled",
611 .data = &stack_tracer_enabled,
612 .maxlen = sizeof(int),
613 .mode = 0644,
614 .proc_handler = stack_trace_sysctl,
615 },
616 #endif
617 #ifdef CONFIG_TRACING
618 {
619 .procname = "ftrace_dump_on_oops",
620 .data = &ftrace_dump_on_oops,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 .proc_handler = proc_dointvec,
624 },
625 {
626 .procname = "traceoff_on_warning",
627 .data = &__disable_trace_on_warning,
628 .maxlen = sizeof(__disable_trace_on_warning),
629 .mode = 0644,
630 .proc_handler = proc_dointvec,
631 },
632 {
633 .procname = "tracepoint_printk",
634 .data = &tracepoint_printk,
635 .maxlen = sizeof(tracepoint_printk),
636 .mode = 0644,
637 .proc_handler = proc_dointvec,
638 },
639 #endif
640 #ifdef CONFIG_KEXEC_CORE
641 {
642 .procname = "kexec_load_disabled",
643 .data = &kexec_load_disabled,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 /* only handle a transition from default "0" to "1" */
647 .proc_handler = proc_dointvec_minmax,
648 .extra1 = &one,
649 .extra2 = &one,
650 },
651 #endif
652 #ifdef CONFIG_MODULES
653 {
654 .procname = "modprobe",
655 .data = &modprobe_path,
656 .maxlen = KMOD_PATH_LEN,
657 .mode = 0644,
658 .proc_handler = proc_dostring,
659 },
660 {
661 .procname = "modules_disabled",
662 .data = &modules_disabled,
663 .maxlen = sizeof(int),
664 .mode = 0644,
665 /* only handle a transition from default "0" to "1" */
666 .proc_handler = proc_dointvec_minmax,
667 .extra1 = &one,
668 .extra2 = &one,
669 },
670 #endif
671 #ifdef CONFIG_UEVENT_HELPER
672 {
673 .procname = "hotplug",
674 .data = &uevent_helper,
675 .maxlen = UEVENT_HELPER_PATH_LEN,
676 .mode = 0644,
677 .proc_handler = proc_dostring,
678 },
679 #endif
680 #ifdef CONFIG_CHR_DEV_SG
681 {
682 .procname = "sg-big-buff",
683 .data = &sg_big_buff,
684 .maxlen = sizeof (int),
685 .mode = 0444,
686 .proc_handler = proc_dointvec,
687 },
688 #endif
689 #ifdef CONFIG_BSD_PROCESS_ACCT
690 {
691 .procname = "acct",
692 .data = &acct_parm,
693 .maxlen = 3*sizeof(int),
694 .mode = 0644,
695 .proc_handler = proc_dointvec,
696 },
697 #endif
698 #ifdef CONFIG_MAGIC_SYSRQ
699 {
700 .procname = "sysrq",
701 .data = &__sysrq_enabled,
702 .maxlen = sizeof (int),
703 .mode = 0644,
704 .proc_handler = sysrq_sysctl_handler,
705 },
706 #endif
707 #ifdef CONFIG_PROC_SYSCTL
708 {
709 .procname = "cad_pid",
710 .data = NULL,
711 .maxlen = sizeof (int),
712 .mode = 0600,
713 .proc_handler = proc_do_cad_pid,
714 },
715 #endif
716 {
717 .procname = "threads-max",
718 .data = NULL,
719 .maxlen = sizeof(int),
720 .mode = 0644,
721 .proc_handler = sysctl_max_threads,
722 },
723 {
724 .procname = "random",
725 .mode = 0555,
726 .child = random_table,
727 },
728 {
729 .procname = "usermodehelper",
730 .mode = 0555,
731 .child = usermodehelper_table,
732 },
733 {
734 .procname = "overflowuid",
735 .data = &overflowuid,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = proc_dointvec_minmax,
739 .extra1 = &minolduid,
740 .extra2 = &maxolduid,
741 },
742 {
743 .procname = "overflowgid",
744 .data = &overflowgid,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = proc_dointvec_minmax,
748 .extra1 = &minolduid,
749 .extra2 = &maxolduid,
750 },
751 #ifdef CONFIG_S390
752 #ifdef CONFIG_MATHEMU
753 {
754 .procname = "ieee_emulation_warnings",
755 .data = &sysctl_ieee_emulation_warnings,
756 .maxlen = sizeof(int),
757 .mode = 0644,
758 .proc_handler = proc_dointvec,
759 },
760 #endif
761 {
762 .procname = "userprocess_debug",
763 .data = &show_unhandled_signals,
764 .maxlen = sizeof(int),
765 .mode = 0644,
766 .proc_handler = proc_dointvec,
767 },
768 #endif
769 {
770 .procname = "pid_max",
771 .data = &pid_max,
772 .maxlen = sizeof (int),
773 .mode = 0644,
774 .proc_handler = proc_dointvec_minmax,
775 .extra1 = &pid_max_min,
776 .extra2 = &pid_max_max,
777 },
778 {
779 .procname = "panic_on_oops",
780 .data = &panic_on_oops,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec,
784 },
785 #if defined CONFIG_PRINTK
786 {
787 .procname = "printk",
788 .data = &console_loglevel,
789 .maxlen = 4*sizeof(int),
790 .mode = 0644,
791 .proc_handler = proc_dointvec,
792 },
793 {
794 .procname = "printk_ratelimit",
795 .data = &printk_ratelimit_state.interval,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec_jiffies,
799 },
800 {
801 .procname = "printk_ratelimit_burst",
802 .data = &printk_ratelimit_state.burst,
803 .maxlen = sizeof(int),
804 .mode = 0644,
805 .proc_handler = proc_dointvec,
806 },
807 {
808 .procname = "printk_delay",
809 .data = &printk_delay_msec,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec_minmax,
813 .extra1 = &zero,
814 .extra2 = &ten_thousand,
815 },
816 {
817 .procname = "printk_devkmsg",
818 .data = devkmsg_log_str,
819 .maxlen = DEVKMSG_STR_MAX_SIZE,
820 .mode = 0644,
821 .proc_handler = devkmsg_sysctl_set_loglvl,
822 },
823 {
824 .procname = "dmesg_restrict",
825 .data = &dmesg_restrict,
826 .maxlen = sizeof(int),
827 .mode = 0644,
828 .proc_handler = proc_dointvec_minmax_sysadmin,
829 .extra1 = &zero,
830 .extra2 = &one,
831 },
832 {
833 .procname = "kptr_restrict",
834 .data = &kptr_restrict,
835 .maxlen = sizeof(int),
836 .mode = 0644,
837 .proc_handler = proc_dointvec_minmax_sysadmin,
838 .extra1 = &zero,
839 .extra2 = &two,
840 },
841 #endif
842 {
843 .procname = "ngroups_max",
844 .data = &ngroups_max,
845 .maxlen = sizeof (int),
846 .mode = 0444,
847 .proc_handler = proc_dointvec,
848 },
849 {
850 .procname = "cap_last_cap",
851 .data = (void *)&cap_last_cap,
852 .maxlen = sizeof(int),
853 .mode = 0444,
854 .proc_handler = proc_dointvec,
855 },
856 #if defined(CONFIG_LOCKUP_DETECTOR)
857 {
858 .procname = "watchdog",
859 .data = &watchdog_user_enabled,
860 .maxlen = sizeof (int),
861 .mode = 0644,
862 .proc_handler = proc_watchdog,
863 .extra1 = &zero,
864 .extra2 = &one,
865 },
866 {
867 .procname = "watchdog_thresh",
868 .data = &watchdog_thresh,
869 .maxlen = sizeof(int),
870 .mode = 0644,
871 .proc_handler = proc_watchdog_thresh,
872 .extra1 = &zero,
873 .extra2 = &sixty,
874 },
875 {
876 .procname = "nmi_watchdog",
877 .data = &nmi_watchdog_enabled,
878 .maxlen = sizeof (int),
879 .mode = 0644,
880 .proc_handler = proc_nmi_watchdog,
881 .extra1 = &zero,
882 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
883 .extra2 = &one,
884 #else
885 .extra2 = &zero,
886 #endif
887 },
888 {
889 .procname = "soft_watchdog",
890 .data = &soft_watchdog_enabled,
891 .maxlen = sizeof (int),
892 .mode = 0644,
893 .proc_handler = proc_soft_watchdog,
894 .extra1 = &zero,
895 .extra2 = &one,
896 },
897 {
898 .procname = "watchdog_cpumask",
899 .data = &watchdog_cpumask_bits,
900 .maxlen = NR_CPUS,
901 .mode = 0644,
902 .proc_handler = proc_watchdog_cpumask,
903 },
904 {
905 .procname = "softlockup_panic",
906 .data = &softlockup_panic,
907 .maxlen = sizeof(int),
908 .mode = 0644,
909 .proc_handler = proc_dointvec_minmax,
910 .extra1 = &zero,
911 .extra2 = &one,
912 },
913 #ifdef CONFIG_HARDLOCKUP_DETECTOR
914 {
915 .procname = "hardlockup_panic",
916 .data = &hardlockup_panic,
917 .maxlen = sizeof(int),
918 .mode = 0644,
919 .proc_handler = proc_dointvec_minmax,
920 .extra1 = &zero,
921 .extra2 = &one,
922 },
923 #endif
924 #ifdef CONFIG_SMP
925 {
926 .procname = "softlockup_all_cpu_backtrace",
927 .data = &sysctl_softlockup_all_cpu_backtrace,
928 .maxlen = sizeof(int),
929 .mode = 0644,
930 .proc_handler = proc_dointvec_minmax,
931 .extra1 = &zero,
932 .extra2 = &one,
933 },
934 {
935 .procname = "hardlockup_all_cpu_backtrace",
936 .data = &sysctl_hardlockup_all_cpu_backtrace,
937 .maxlen = sizeof(int),
938 .mode = 0644,
939 .proc_handler = proc_dointvec_minmax,
940 .extra1 = &zero,
941 .extra2 = &one,
942 },
943 #endif /* CONFIG_SMP */
944 #endif
945 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
946 {
947 .procname = "unknown_nmi_panic",
948 .data = &unknown_nmi_panic,
949 .maxlen = sizeof (int),
950 .mode = 0644,
951 .proc_handler = proc_dointvec,
952 },
953 #endif
954 #if defined(CONFIG_X86)
955 {
956 .procname = "panic_on_unrecovered_nmi",
957 .data = &panic_on_unrecovered_nmi,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec,
961 },
962 {
963 .procname = "panic_on_io_nmi",
964 .data = &panic_on_io_nmi,
965 .maxlen = sizeof(int),
966 .mode = 0644,
967 .proc_handler = proc_dointvec,
968 },
969 #ifdef CONFIG_DEBUG_STACKOVERFLOW
970 {
971 .procname = "panic_on_stackoverflow",
972 .data = &sysctl_panic_on_stackoverflow,
973 .maxlen = sizeof(int),
974 .mode = 0644,
975 .proc_handler = proc_dointvec,
976 },
977 #endif
978 {
979 .procname = "bootloader_type",
980 .data = &bootloader_type,
981 .maxlen = sizeof (int),
982 .mode = 0444,
983 .proc_handler = proc_dointvec,
984 },
985 {
986 .procname = "bootloader_version",
987 .data = &bootloader_version,
988 .maxlen = sizeof (int),
989 .mode = 0444,
990 .proc_handler = proc_dointvec,
991 },
992 {
993 .procname = "kstack_depth_to_print",
994 .data = &kstack_depth_to_print,
995 .maxlen = sizeof(int),
996 .mode = 0644,
997 .proc_handler = proc_dointvec,
998 },
999 {
1000 .procname = "io_delay_type",
1001 .data = &io_delay_type,
1002 .maxlen = sizeof(int),
1003 .mode = 0644,
1004 .proc_handler = proc_dointvec,
1005 },
1006 #endif
1007 #if defined(CONFIG_MMU)
1008 {
1009 .procname = "randomize_va_space",
1010 .data = &randomize_va_space,
1011 .maxlen = sizeof(int),
1012 .mode = 0644,
1013 .proc_handler = proc_dointvec,
1014 },
1015 #endif
1016 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1017 {
1018 .procname = "spin_retry",
1019 .data = &spin_retry,
1020 .maxlen = sizeof (int),
1021 .mode = 0644,
1022 .proc_handler = proc_dointvec,
1023 },
1024 #endif
1025 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1026 {
1027 .procname = "acpi_video_flags",
1028 .data = &acpi_realmode_flags,
1029 .maxlen = sizeof (unsigned long),
1030 .mode = 0644,
1031 .proc_handler = proc_doulongvec_minmax,
1032 },
1033 #endif
1034 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1035 {
1036 .procname = "ignore-unaligned-usertrap",
1037 .data = &no_unaligned_warning,
1038 .maxlen = sizeof (int),
1039 .mode = 0644,
1040 .proc_handler = proc_dointvec,
1041 },
1042 #endif
1043 #ifdef CONFIG_IA64
1044 {
1045 .procname = "unaligned-dump-stack",
1046 .data = &unaligned_dump_stack,
1047 .maxlen = sizeof (int),
1048 .mode = 0644,
1049 .proc_handler = proc_dointvec,
1050 },
1051 #endif
1052 #ifdef CONFIG_DETECT_HUNG_TASK
1053 {
1054 .procname = "hung_task_panic",
1055 .data = &sysctl_hung_task_panic,
1056 .maxlen = sizeof(int),
1057 .mode = 0644,
1058 .proc_handler = proc_dointvec_minmax,
1059 .extra1 = &zero,
1060 .extra2 = &one,
1061 },
1062 {
1063 .procname = "hung_task_check_count",
1064 .data = &sysctl_hung_task_check_count,
1065 .maxlen = sizeof(int),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec_minmax,
1068 .extra1 = &zero,
1069 },
1070 {
1071 .procname = "hung_task_timeout_secs",
1072 .data = &sysctl_hung_task_timeout_secs,
1073 .maxlen = sizeof(unsigned long),
1074 .mode = 0644,
1075 .proc_handler = proc_dohung_task_timeout_secs,
1076 .extra2 = &hung_task_timeout_max,
1077 },
1078 {
1079 .procname = "hung_task_warnings",
1080 .data = &sysctl_hung_task_warnings,
1081 .maxlen = sizeof(int),
1082 .mode = 0644,
1083 .proc_handler = proc_dointvec_minmax,
1084 .extra1 = &neg_one,
1085 },
1086 #endif
1087 #ifdef CONFIG_RT_MUTEXES
1088 {
1089 .procname = "max_lock_depth",
1090 .data = &max_lock_depth,
1091 .maxlen = sizeof(int),
1092 .mode = 0644,
1093 .proc_handler = proc_dointvec,
1094 },
1095 #endif
1096 {
1097 .procname = "poweroff_cmd",
1098 .data = &poweroff_cmd,
1099 .maxlen = POWEROFF_CMD_PATH_LEN,
1100 .mode = 0644,
1101 .proc_handler = proc_dostring,
1102 },
1103 #ifdef CONFIG_KEYS
1104 {
1105 .procname = "keys",
1106 .mode = 0555,
1107 .child = key_sysctls,
1108 },
1109 #endif
1110 #ifdef CONFIG_PERF_EVENTS
1111 /*
1112 * User-space scripts rely on the existence of this file
1113 * as a feature check for perf_events being enabled.
1114 *
1115 * So it's an ABI, do not remove!
1116 */
1117 {
1118 .procname = "perf_event_paranoid",
1119 .data = &sysctl_perf_event_paranoid,
1120 .maxlen = sizeof(sysctl_perf_event_paranoid),
1121 .mode = 0644,
1122 .proc_handler = proc_dointvec,
1123 },
1124 {
1125 .procname = "perf_event_mlock_kb",
1126 .data = &sysctl_perf_event_mlock,
1127 .maxlen = sizeof(sysctl_perf_event_mlock),
1128 .mode = 0644,
1129 .proc_handler = proc_dointvec,
1130 },
1131 {
1132 .procname = "perf_event_max_sample_rate",
1133 .data = &sysctl_perf_event_sample_rate,
1134 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1135 .mode = 0644,
1136 .proc_handler = perf_proc_update_handler,
1137 .extra1 = &one,
1138 },
1139 {
1140 .procname = "perf_cpu_time_max_percent",
1141 .data = &sysctl_perf_cpu_time_max_percent,
1142 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1143 .mode = 0644,
1144 .proc_handler = perf_cpu_time_max_percent_handler,
1145 .extra1 = &zero,
1146 .extra2 = &one_hundred,
1147 },
1148 {
1149 .procname = "perf_event_max_stack",
1150 .data = &sysctl_perf_event_max_stack,
1151 .maxlen = sizeof(sysctl_perf_event_max_stack),
1152 .mode = 0644,
1153 .proc_handler = perf_event_max_stack_handler,
1154 .extra1 = &zero,
1155 .extra2 = &six_hundred_forty_kb,
1156 },
1157 {
1158 .procname = "perf_event_max_contexts_per_stack",
1159 .data = &sysctl_perf_event_max_contexts_per_stack,
1160 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1161 .mode = 0644,
1162 .proc_handler = perf_event_max_stack_handler,
1163 .extra1 = &zero,
1164 .extra2 = &one_thousand,
1165 },
1166 #endif
1167 #ifdef CONFIG_KMEMCHECK
1168 {
1169 .procname = "kmemcheck",
1170 .data = &kmemcheck_enabled,
1171 .maxlen = sizeof(int),
1172 .mode = 0644,
1173 .proc_handler = proc_dointvec,
1174 },
1175 #endif
1176 {
1177 .procname = "panic_on_warn",
1178 .data = &panic_on_warn,
1179 .maxlen = sizeof(int),
1180 .mode = 0644,
1181 .proc_handler = proc_dointvec_minmax,
1182 .extra1 = &zero,
1183 .extra2 = &one,
1184 },
1185 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1186 {
1187 .procname = "timer_migration",
1188 .data = &sysctl_timer_migration,
1189 .maxlen = sizeof(unsigned int),
1190 .mode = 0644,
1191 .proc_handler = timer_migration_handler,
1192 },
1193 #endif
1194 #ifdef CONFIG_BPF_SYSCALL
1195 {
1196 .procname = "unprivileged_bpf_disabled",
1197 .data = &sysctl_unprivileged_bpf_disabled,
1198 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1199 .mode = 0644,
1200 /* only handle a transition from default "0" to "1" */
1201 .proc_handler = proc_dointvec_minmax,
1202 .extra1 = &one,
1203 .extra2 = &one,
1204 },
1205 #endif
1206 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1207 {
1208 .procname = "panic_on_rcu_stall",
1209 .data = &sysctl_panic_on_rcu_stall,
1210 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1211 .mode = 0644,
1212 .proc_handler = proc_dointvec_minmax,
1213 .extra1 = &zero,
1214 .extra2 = &one,
1215 },
1216 #endif
1217 { }
1218 };
1219
1220 static struct ctl_table vm_table[] = {
1221 {
1222 .procname = "overcommit_memory",
1223 .data = &sysctl_overcommit_memory,
1224 .maxlen = sizeof(sysctl_overcommit_memory),
1225 .mode = 0644,
1226 .proc_handler = proc_dointvec_minmax,
1227 .extra1 = &zero,
1228 .extra2 = &two,
1229 },
1230 {
1231 .procname = "panic_on_oom",
1232 .data = &sysctl_panic_on_oom,
1233 .maxlen = sizeof(sysctl_panic_on_oom),
1234 .mode = 0644,
1235 .proc_handler = proc_dointvec_minmax,
1236 .extra1 = &zero,
1237 .extra2 = &two,
1238 },
1239 {
1240 .procname = "oom_kill_allocating_task",
1241 .data = &sysctl_oom_kill_allocating_task,
1242 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1243 .mode = 0644,
1244 .proc_handler = proc_dointvec,
1245 },
1246 {
1247 .procname = "oom_dump_tasks",
1248 .data = &sysctl_oom_dump_tasks,
1249 .maxlen = sizeof(sysctl_oom_dump_tasks),
1250 .mode = 0644,
1251 .proc_handler = proc_dointvec,
1252 },
1253 {
1254 .procname = "overcommit_ratio",
1255 .data = &sysctl_overcommit_ratio,
1256 .maxlen = sizeof(sysctl_overcommit_ratio),
1257 .mode = 0644,
1258 .proc_handler = overcommit_ratio_handler,
1259 },
1260 {
1261 .procname = "overcommit_kbytes",
1262 .data = &sysctl_overcommit_kbytes,
1263 .maxlen = sizeof(sysctl_overcommit_kbytes),
1264 .mode = 0644,
1265 .proc_handler = overcommit_kbytes_handler,
1266 },
1267 {
1268 .procname = "page-cluster",
1269 .data = &page_cluster,
1270 .maxlen = sizeof(int),
1271 .mode = 0644,
1272 .proc_handler = proc_dointvec_minmax,
1273 .extra1 = &zero,
1274 },
1275 {
1276 .procname = "dirty_background_ratio",
1277 .data = &dirty_background_ratio,
1278 .maxlen = sizeof(dirty_background_ratio),
1279 .mode = 0644,
1280 .proc_handler = dirty_background_ratio_handler,
1281 .extra1 = &zero,
1282 .extra2 = &one_hundred,
1283 },
1284 {
1285 .procname = "dirty_background_bytes",
1286 .data = &dirty_background_bytes,
1287 .maxlen = sizeof(dirty_background_bytes),
1288 .mode = 0644,
1289 .proc_handler = dirty_background_bytes_handler,
1290 .extra1 = &one_ul,
1291 },
1292 {
1293 .procname = "dirty_ratio",
1294 .data = &vm_dirty_ratio,
1295 .maxlen = sizeof(vm_dirty_ratio),
1296 .mode = 0644,
1297 .proc_handler = dirty_ratio_handler,
1298 .extra1 = &zero,
1299 .extra2 = &one_hundred,
1300 },
1301 {
1302 .procname = "dirty_bytes",
1303 .data = &vm_dirty_bytes,
1304 .maxlen = sizeof(vm_dirty_bytes),
1305 .mode = 0644,
1306 .proc_handler = dirty_bytes_handler,
1307 .extra1 = &dirty_bytes_min,
1308 },
1309 {
1310 .procname = "dirty_writeback_centisecs",
1311 .data = &dirty_writeback_interval,
1312 .maxlen = sizeof(dirty_writeback_interval),
1313 .mode = 0644,
1314 .proc_handler = dirty_writeback_centisecs_handler,
1315 },
1316 {
1317 .procname = "dirty_expire_centisecs",
1318 .data = &dirty_expire_interval,
1319 .maxlen = sizeof(dirty_expire_interval),
1320 .mode = 0644,
1321 .proc_handler = proc_dointvec_minmax,
1322 .extra1 = &zero,
1323 },
1324 {
1325 .procname = "dirtytime_expire_seconds",
1326 .data = &dirtytime_expire_interval,
1327 .maxlen = sizeof(dirty_expire_interval),
1328 .mode = 0644,
1329 .proc_handler = dirtytime_interval_handler,
1330 .extra1 = &zero,
1331 },
1332 {
1333 .procname = "nr_pdflush_threads",
1334 .mode = 0444 /* read-only */,
1335 .proc_handler = pdflush_proc_obsolete,
1336 },
1337 {
1338 .procname = "swappiness",
1339 .data = &vm_swappiness,
1340 .maxlen = sizeof(vm_swappiness),
1341 .mode = 0644,
1342 .proc_handler = proc_dointvec_minmax,
1343 .extra1 = &zero,
1344 .extra2 = &one_hundred,
1345 },
1346 #ifdef CONFIG_HUGETLB_PAGE
1347 {
1348 .procname = "nr_hugepages",
1349 .data = NULL,
1350 .maxlen = sizeof(unsigned long),
1351 .mode = 0644,
1352 .proc_handler = hugetlb_sysctl_handler,
1353 },
1354 #ifdef CONFIG_NUMA
1355 {
1356 .procname = "nr_hugepages_mempolicy",
1357 .data = NULL,
1358 .maxlen = sizeof(unsigned long),
1359 .mode = 0644,
1360 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1361 },
1362 #endif
1363 {
1364 .procname = "hugetlb_shm_group",
1365 .data = &sysctl_hugetlb_shm_group,
1366 .maxlen = sizeof(gid_t),
1367 .mode = 0644,
1368 .proc_handler = proc_dointvec,
1369 },
1370 {
1371 .procname = "hugepages_treat_as_movable",
1372 .data = &hugepages_treat_as_movable,
1373 .maxlen = sizeof(int),
1374 .mode = 0644,
1375 .proc_handler = proc_dointvec,
1376 },
1377 {
1378 .procname = "nr_overcommit_hugepages",
1379 .data = NULL,
1380 .maxlen = sizeof(unsigned long),
1381 .mode = 0644,
1382 .proc_handler = hugetlb_overcommit_handler,
1383 },
1384 #endif
1385 {
1386 .procname = "lowmem_reserve_ratio",
1387 .data = &sysctl_lowmem_reserve_ratio,
1388 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1389 .mode = 0644,
1390 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1391 },
1392 {
1393 .procname = "drop_caches",
1394 .data = &sysctl_drop_caches,
1395 .maxlen = sizeof(int),
1396 .mode = 0644,
1397 .proc_handler = drop_caches_sysctl_handler,
1398 .extra1 = &one,
1399 .extra2 = &four,
1400 },
1401 #ifdef CONFIG_COMPACTION
1402 {
1403 .procname = "compact_memory",
1404 .data = &sysctl_compact_memory,
1405 .maxlen = sizeof(int),
1406 .mode = 0200,
1407 .proc_handler = sysctl_compaction_handler,
1408 },
1409 {
1410 .procname = "extfrag_threshold",
1411 .data = &sysctl_extfrag_threshold,
1412 .maxlen = sizeof(int),
1413 .mode = 0644,
1414 .proc_handler = sysctl_extfrag_handler,
1415 .extra1 = &min_extfrag_threshold,
1416 .extra2 = &max_extfrag_threshold,
1417 },
1418 {
1419 .procname = "compact_unevictable_allowed",
1420 .data = &sysctl_compact_unevictable_allowed,
1421 .maxlen = sizeof(int),
1422 .mode = 0644,
1423 .proc_handler = proc_dointvec,
1424 .extra1 = &zero,
1425 .extra2 = &one,
1426 },
1427
1428 #endif /* CONFIG_COMPACTION */
1429 {
1430 .procname = "min_free_kbytes",
1431 .data = &min_free_kbytes,
1432 .maxlen = sizeof(min_free_kbytes),
1433 .mode = 0644,
1434 .proc_handler = min_free_kbytes_sysctl_handler,
1435 .extra1 = &zero,
1436 },
1437 {
1438 .procname = "watermark_scale_factor",
1439 .data = &watermark_scale_factor,
1440 .maxlen = sizeof(watermark_scale_factor),
1441 .mode = 0644,
1442 .proc_handler = watermark_scale_factor_sysctl_handler,
1443 .extra1 = &one,
1444 .extra2 = &one_thousand,
1445 },
1446 {
1447 .procname = "percpu_pagelist_fraction",
1448 .data = &percpu_pagelist_fraction,
1449 .maxlen = sizeof(percpu_pagelist_fraction),
1450 .mode = 0644,
1451 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1452 .extra1 = &zero,
1453 },
1454 #ifdef CONFIG_MMU
1455 {
1456 .procname = "max_map_count",
1457 .data = &sysctl_max_map_count,
1458 .maxlen = sizeof(sysctl_max_map_count),
1459 .mode = 0644,
1460 .proc_handler = proc_dointvec_minmax,
1461 .extra1 = &zero,
1462 },
1463 #else
1464 {
1465 .procname = "nr_trim_pages",
1466 .data = &sysctl_nr_trim_pages,
1467 .maxlen = sizeof(sysctl_nr_trim_pages),
1468 .mode = 0644,
1469 .proc_handler = proc_dointvec_minmax,
1470 .extra1 = &zero,
1471 },
1472 #endif
1473 {
1474 .procname = "laptop_mode",
1475 .data = &laptop_mode,
1476 .maxlen = sizeof(laptop_mode),
1477 .mode = 0644,
1478 .proc_handler = proc_dointvec_jiffies,
1479 },
1480 {
1481 .procname = "block_dump",
1482 .data = &block_dump,
1483 .maxlen = sizeof(block_dump),
1484 .mode = 0644,
1485 .proc_handler = proc_dointvec,
1486 .extra1 = &zero,
1487 },
1488 {
1489 .procname = "vfs_cache_pressure",
1490 .data = &sysctl_vfs_cache_pressure,
1491 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1492 .mode = 0644,
1493 .proc_handler = proc_dointvec,
1494 .extra1 = &zero,
1495 },
1496 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1497 {
1498 .procname = "legacy_va_layout",
1499 .data = &sysctl_legacy_va_layout,
1500 .maxlen = sizeof(sysctl_legacy_va_layout),
1501 .mode = 0644,
1502 .proc_handler = proc_dointvec,
1503 .extra1 = &zero,
1504 },
1505 #endif
1506 #ifdef CONFIG_NUMA
1507 {
1508 .procname = "zone_reclaim_mode",
1509 .data = &node_reclaim_mode,
1510 .maxlen = sizeof(node_reclaim_mode),
1511 .mode = 0644,
1512 .proc_handler = proc_dointvec,
1513 .extra1 = &zero,
1514 },
1515 {
1516 .procname = "min_unmapped_ratio",
1517 .data = &sysctl_min_unmapped_ratio,
1518 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1519 .mode = 0644,
1520 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1521 .extra1 = &zero,
1522 .extra2 = &one_hundred,
1523 },
1524 {
1525 .procname = "min_slab_ratio",
1526 .data = &sysctl_min_slab_ratio,
1527 .maxlen = sizeof(sysctl_min_slab_ratio),
1528 .mode = 0644,
1529 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1530 .extra1 = &zero,
1531 .extra2 = &one_hundred,
1532 },
1533 #endif
1534 #ifdef CONFIG_SMP
1535 {
1536 .procname = "stat_interval",
1537 .data = &sysctl_stat_interval,
1538 .maxlen = sizeof(sysctl_stat_interval),
1539 .mode = 0644,
1540 .proc_handler = proc_dointvec_jiffies,
1541 },
1542 {
1543 .procname = "stat_refresh",
1544 .data = NULL,
1545 .maxlen = 0,
1546 .mode = 0600,
1547 .proc_handler = vmstat_refresh,
1548 },
1549 #endif
1550 #ifdef CONFIG_MMU
1551 {
1552 .procname = "mmap_min_addr",
1553 .data = &dac_mmap_min_addr,
1554 .maxlen = sizeof(unsigned long),
1555 .mode = 0644,
1556 .proc_handler = mmap_min_addr_handler,
1557 },
1558 #endif
1559 #ifdef CONFIG_NUMA
1560 {
1561 .procname = "numa_zonelist_order",
1562 .data = &numa_zonelist_order,
1563 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1564 .mode = 0644,
1565 .proc_handler = numa_zonelist_order_handler,
1566 },
1567 #endif
1568 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1569 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1570 {
1571 .procname = "vdso_enabled",
1572 #ifdef CONFIG_X86_32
1573 .data = &vdso32_enabled,
1574 .maxlen = sizeof(vdso32_enabled),
1575 #else
1576 .data = &vdso_enabled,
1577 .maxlen = sizeof(vdso_enabled),
1578 #endif
1579 .mode = 0644,
1580 .proc_handler = proc_dointvec,
1581 .extra1 = &zero,
1582 },
1583 #endif
1584 #ifdef CONFIG_HIGHMEM
1585 {
1586 .procname = "highmem_is_dirtyable",
1587 .data = &vm_highmem_is_dirtyable,
1588 .maxlen = sizeof(vm_highmem_is_dirtyable),
1589 .mode = 0644,
1590 .proc_handler = proc_dointvec_minmax,
1591 .extra1 = &zero,
1592 .extra2 = &one,
1593 },
1594 #endif
1595 #ifdef CONFIG_MEMORY_FAILURE
1596 {
1597 .procname = "memory_failure_early_kill",
1598 .data = &sysctl_memory_failure_early_kill,
1599 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1600 .mode = 0644,
1601 .proc_handler = proc_dointvec_minmax,
1602 .extra1 = &zero,
1603 .extra2 = &one,
1604 },
1605 {
1606 .procname = "memory_failure_recovery",
1607 .data = &sysctl_memory_failure_recovery,
1608 .maxlen = sizeof(sysctl_memory_failure_recovery),
1609 .mode = 0644,
1610 .proc_handler = proc_dointvec_minmax,
1611 .extra1 = &zero,
1612 .extra2 = &one,
1613 },
1614 #endif
1615 {
1616 .procname = "user_reserve_kbytes",
1617 .data = &sysctl_user_reserve_kbytes,
1618 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1619 .mode = 0644,
1620 .proc_handler = proc_doulongvec_minmax,
1621 },
1622 {
1623 .procname = "admin_reserve_kbytes",
1624 .data = &sysctl_admin_reserve_kbytes,
1625 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1626 .mode = 0644,
1627 .proc_handler = proc_doulongvec_minmax,
1628 },
1629 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1630 {
1631 .procname = "mmap_rnd_bits",
1632 .data = &mmap_rnd_bits,
1633 .maxlen = sizeof(mmap_rnd_bits),
1634 .mode = 0600,
1635 .proc_handler = proc_dointvec_minmax,
1636 .extra1 = (void *)&mmap_rnd_bits_min,
1637 .extra2 = (void *)&mmap_rnd_bits_max,
1638 },
1639 #endif
1640 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1641 {
1642 .procname = "mmap_rnd_compat_bits",
1643 .data = &mmap_rnd_compat_bits,
1644 .maxlen = sizeof(mmap_rnd_compat_bits),
1645 .mode = 0600,
1646 .proc_handler = proc_dointvec_minmax,
1647 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1648 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1649 },
1650 #endif
1651 { }
1652 };
1653
1654 static struct ctl_table fs_table[] = {
1655 {
1656 .procname = "inode-nr",
1657 .data = &inodes_stat,
1658 .maxlen = 2*sizeof(long),
1659 .mode = 0444,
1660 .proc_handler = proc_nr_inodes,
1661 },
1662 {
1663 .procname = "inode-state",
1664 .data = &inodes_stat,
1665 .maxlen = 7*sizeof(long),
1666 .mode = 0444,
1667 .proc_handler = proc_nr_inodes,
1668 },
1669 {
1670 .procname = "file-nr",
1671 .data = &files_stat,
1672 .maxlen = sizeof(files_stat),
1673 .mode = 0444,
1674 .proc_handler = proc_nr_files,
1675 },
1676 {
1677 .procname = "file-max",
1678 .data = &files_stat.max_files,
1679 .maxlen = sizeof(files_stat.max_files),
1680 .mode = 0644,
1681 .proc_handler = proc_doulongvec_minmax,
1682 },
1683 {
1684 .procname = "nr_open",
1685 .data = &sysctl_nr_open,
1686 .maxlen = sizeof(unsigned int),
1687 .mode = 0644,
1688 .proc_handler = proc_dointvec_minmax,
1689 .extra1 = &sysctl_nr_open_min,
1690 .extra2 = &sysctl_nr_open_max,
1691 },
1692 {
1693 .procname = "dentry-state",
1694 .data = &dentry_stat,
1695 .maxlen = 6*sizeof(long),
1696 .mode = 0444,
1697 .proc_handler = proc_nr_dentry,
1698 },
1699 {
1700 .procname = "overflowuid",
1701 .data = &fs_overflowuid,
1702 .maxlen = sizeof(int),
1703 .mode = 0644,
1704 .proc_handler = proc_dointvec_minmax,
1705 .extra1 = &minolduid,
1706 .extra2 = &maxolduid,
1707 },
1708 {
1709 .procname = "overflowgid",
1710 .data = &fs_overflowgid,
1711 .maxlen = sizeof(int),
1712 .mode = 0644,
1713 .proc_handler = proc_dointvec_minmax,
1714 .extra1 = &minolduid,
1715 .extra2 = &maxolduid,
1716 },
1717 #ifdef CONFIG_FILE_LOCKING
1718 {
1719 .procname = "leases-enable",
1720 .data = &leases_enable,
1721 .maxlen = sizeof(int),
1722 .mode = 0644,
1723 .proc_handler = proc_dointvec,
1724 },
1725 #endif
1726 #ifdef CONFIG_DNOTIFY
1727 {
1728 .procname = "dir-notify-enable",
1729 .data = &dir_notify_enable,
1730 .maxlen = sizeof(int),
1731 .mode = 0644,
1732 .proc_handler = proc_dointvec,
1733 },
1734 #endif
1735 #ifdef CONFIG_MMU
1736 #ifdef CONFIG_FILE_LOCKING
1737 {
1738 .procname = "lease-break-time",
1739 .data = &lease_break_time,
1740 .maxlen = sizeof(int),
1741 .mode = 0644,
1742 .proc_handler = proc_dointvec,
1743 },
1744 #endif
1745 #ifdef CONFIG_AIO
1746 {
1747 .procname = "aio-nr",
1748 .data = &aio_nr,
1749 .maxlen = sizeof(aio_nr),
1750 .mode = 0444,
1751 .proc_handler = proc_doulongvec_minmax,
1752 },
1753 {
1754 .procname = "aio-max-nr",
1755 .data = &aio_max_nr,
1756 .maxlen = sizeof(aio_max_nr),
1757 .mode = 0644,
1758 .proc_handler = proc_doulongvec_minmax,
1759 },
1760 #endif /* CONFIG_AIO */
1761 #ifdef CONFIG_INOTIFY_USER
1762 {
1763 .procname = "inotify",
1764 .mode = 0555,
1765 .child = inotify_table,
1766 },
1767 #endif
1768 #ifdef CONFIG_EPOLL
1769 {
1770 .procname = "epoll",
1771 .mode = 0555,
1772 .child = epoll_table,
1773 },
1774 #endif
1775 #endif
1776 {
1777 .procname = "protected_symlinks",
1778 .data = &sysctl_protected_symlinks,
1779 .maxlen = sizeof(int),
1780 .mode = 0600,
1781 .proc_handler = proc_dointvec_minmax,
1782 .extra1 = &zero,
1783 .extra2 = &one,
1784 },
1785 {
1786 .procname = "protected_hardlinks",
1787 .data = &sysctl_protected_hardlinks,
1788 .maxlen = sizeof(int),
1789 .mode = 0600,
1790 .proc_handler = proc_dointvec_minmax,
1791 .extra1 = &zero,
1792 .extra2 = &one,
1793 },
1794 {
1795 .procname = "suid_dumpable",
1796 .data = &suid_dumpable,
1797 .maxlen = sizeof(int),
1798 .mode = 0644,
1799 .proc_handler = proc_dointvec_minmax_coredump,
1800 .extra1 = &zero,
1801 .extra2 = &two,
1802 },
1803 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1804 {
1805 .procname = "binfmt_misc",
1806 .mode = 0555,
1807 .child = sysctl_mount_point,
1808 },
1809 #endif
1810 {
1811 .procname = "pipe-max-size",
1812 .data = &pipe_max_size,
1813 .maxlen = sizeof(int),
1814 .mode = 0644,
1815 .proc_handler = &pipe_proc_fn,
1816 .extra1 = &pipe_min_size,
1817 },
1818 {
1819 .procname = "pipe-user-pages-hard",
1820 .data = &pipe_user_pages_hard,
1821 .maxlen = sizeof(pipe_user_pages_hard),
1822 .mode = 0644,
1823 .proc_handler = proc_doulongvec_minmax,
1824 },
1825 {
1826 .procname = "pipe-user-pages-soft",
1827 .data = &pipe_user_pages_soft,
1828 .maxlen = sizeof(pipe_user_pages_soft),
1829 .mode = 0644,
1830 .proc_handler = proc_doulongvec_minmax,
1831 },
1832 {
1833 .procname = "mount-max",
1834 .data = &sysctl_mount_max,
1835 .maxlen = sizeof(unsigned int),
1836 .mode = 0644,
1837 .proc_handler = proc_dointvec_minmax,
1838 .extra1 = &one,
1839 },
1840 { }
1841 };
1842
1843 static struct ctl_table debug_table[] = {
1844 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1845 {
1846 .procname = "exception-trace",
1847 .data = &show_unhandled_signals,
1848 .maxlen = sizeof(int),
1849 .mode = 0644,
1850 .proc_handler = proc_dointvec
1851 },
1852 #endif
1853 #if defined(CONFIG_OPTPROBES)
1854 {
1855 .procname = "kprobes-optimization",
1856 .data = &sysctl_kprobes_optimization,
1857 .maxlen = sizeof(int),
1858 .mode = 0644,
1859 .proc_handler = proc_kprobes_optimization_handler,
1860 .extra1 = &zero,
1861 .extra2 = &one,
1862 },
1863 #endif
1864 { }
1865 };
1866
1867 static struct ctl_table dev_table[] = {
1868 { }
1869 };
1870
1871 int __init sysctl_init(void)
1872 {
1873 struct ctl_table_header *hdr;
1874
1875 hdr = register_sysctl_table(sysctl_base_table);
1876 kmemleak_not_leak(hdr);
1877 return 0;
1878 }
1879
1880 #endif /* CONFIG_SYSCTL */
1881
1882 /*
1883 * /proc/sys support
1884 */
1885
1886 #ifdef CONFIG_PROC_SYSCTL
1887
1888 static int _proc_do_string(char *data, int maxlen, int write,
1889 char __user *buffer,
1890 size_t *lenp, loff_t *ppos)
1891 {
1892 size_t len;
1893 char __user *p;
1894 char c;
1895
1896 if (!data || !maxlen || !*lenp) {
1897 *lenp = 0;
1898 return 0;
1899 }
1900
1901 if (write) {
1902 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1903 /* Only continue writes not past the end of buffer. */
1904 len = strlen(data);
1905 if (len > maxlen - 1)
1906 len = maxlen - 1;
1907
1908 if (*ppos > len)
1909 return 0;
1910 len = *ppos;
1911 } else {
1912 /* Start writing from beginning of buffer. */
1913 len = 0;
1914 }
1915
1916 *ppos += *lenp;
1917 p = buffer;
1918 while ((p - buffer) < *lenp && len < maxlen - 1) {
1919 if (get_user(c, p++))
1920 return -EFAULT;
1921 if (c == 0 || c == '\n')
1922 break;
1923 data[len++] = c;
1924 }
1925 data[len] = 0;
1926 } else {
1927 len = strlen(data);
1928 if (len > maxlen)
1929 len = maxlen;
1930
1931 if (*ppos > len) {
1932 *lenp = 0;
1933 return 0;
1934 }
1935
1936 data += *ppos;
1937 len -= *ppos;
1938
1939 if (len > *lenp)
1940 len = *lenp;
1941 if (len)
1942 if (copy_to_user(buffer, data, len))
1943 return -EFAULT;
1944 if (len < *lenp) {
1945 if (put_user('\n', buffer + len))
1946 return -EFAULT;
1947 len++;
1948 }
1949 *lenp = len;
1950 *ppos += len;
1951 }
1952 return 0;
1953 }
1954
1955 static void warn_sysctl_write(struct ctl_table *table)
1956 {
1957 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1958 "This will not be supported in the future. To silence this\n"
1959 "warning, set kernel.sysctl_writes_strict = -1\n",
1960 current->comm, table->procname);
1961 }
1962
1963 /**
1964 * proc_dostring - read a string sysctl
1965 * @table: the sysctl table
1966 * @write: %TRUE if this is a write to the sysctl file
1967 * @buffer: the user buffer
1968 * @lenp: the size of the user buffer
1969 * @ppos: file position
1970 *
1971 * Reads/writes a string from/to the user buffer. If the kernel
1972 * buffer provided is not large enough to hold the string, the
1973 * string is truncated. The copied string is %NULL-terminated.
1974 * If the string is being read by the user process, it is copied
1975 * and a newline '\n' is added. It is truncated if the buffer is
1976 * not large enough.
1977 *
1978 * Returns 0 on success.
1979 */
1980 int proc_dostring(struct ctl_table *table, int write,
1981 void __user *buffer, size_t *lenp, loff_t *ppos)
1982 {
1983 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1984 warn_sysctl_write(table);
1985
1986 return _proc_do_string((char *)(table->data), table->maxlen, write,
1987 (char __user *)buffer, lenp, ppos);
1988 }
1989
1990 static size_t proc_skip_spaces(char **buf)
1991 {
1992 size_t ret;
1993 char *tmp = skip_spaces(*buf);
1994 ret = tmp - *buf;
1995 *buf = tmp;
1996 return ret;
1997 }
1998
1999 static void proc_skip_char(char **buf, size_t *size, const char v)
2000 {
2001 while (*size) {
2002 if (**buf != v)
2003 break;
2004 (*size)--;
2005 (*buf)++;
2006 }
2007 }
2008
2009 #define TMPBUFLEN 22
2010 /**
2011 * proc_get_long - reads an ASCII formatted integer from a user buffer
2012 *
2013 * @buf: a kernel buffer
2014 * @size: size of the kernel buffer
2015 * @val: this is where the number will be stored
2016 * @neg: set to %TRUE if number is negative
2017 * @perm_tr: a vector which contains the allowed trailers
2018 * @perm_tr_len: size of the perm_tr vector
2019 * @tr: pointer to store the trailer character
2020 *
2021 * In case of success %0 is returned and @buf and @size are updated with
2022 * the amount of bytes read. If @tr is non-NULL and a trailing
2023 * character exists (size is non-zero after returning from this
2024 * function), @tr is updated with the trailing character.
2025 */
2026 static int proc_get_long(char **buf, size_t *size,
2027 unsigned long *val, bool *neg,
2028 const char *perm_tr, unsigned perm_tr_len, char *tr)
2029 {
2030 int len;
2031 char *p, tmp[TMPBUFLEN];
2032
2033 if (!*size)
2034 return -EINVAL;
2035
2036 len = *size;
2037 if (len > TMPBUFLEN - 1)
2038 len = TMPBUFLEN - 1;
2039
2040 memcpy(tmp, *buf, len);
2041
2042 tmp[len] = 0;
2043 p = tmp;
2044 if (*p == '-' && *size > 1) {
2045 *neg = true;
2046 p++;
2047 } else
2048 *neg = false;
2049 if (!isdigit(*p))
2050 return -EINVAL;
2051
2052 *val = simple_strtoul(p, &p, 0);
2053
2054 len = p - tmp;
2055
2056 /* We don't know if the next char is whitespace thus we may accept
2057 * invalid integers (e.g. 1234...a) or two integers instead of one
2058 * (e.g. 123...1). So lets not allow such large numbers. */
2059 if (len == TMPBUFLEN - 1)
2060 return -EINVAL;
2061
2062 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2063 return -EINVAL;
2064
2065 if (tr && (len < *size))
2066 *tr = *p;
2067
2068 *buf += len;
2069 *size -= len;
2070
2071 return 0;
2072 }
2073
2074 /**
2075 * proc_put_long - converts an integer to a decimal ASCII formatted string
2076 *
2077 * @buf: the user buffer
2078 * @size: the size of the user buffer
2079 * @val: the integer to be converted
2080 * @neg: sign of the number, %TRUE for negative
2081 *
2082 * In case of success %0 is returned and @buf and @size are updated with
2083 * the amount of bytes written.
2084 */
2085 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2086 bool neg)
2087 {
2088 int len;
2089 char tmp[TMPBUFLEN], *p = tmp;
2090
2091 sprintf(p, "%s%lu", neg ? "-" : "", val);
2092 len = strlen(tmp);
2093 if (len > *size)
2094 len = *size;
2095 if (copy_to_user(*buf, tmp, len))
2096 return -EFAULT;
2097 *size -= len;
2098 *buf += len;
2099 return 0;
2100 }
2101 #undef TMPBUFLEN
2102
2103 static int proc_put_char(void __user **buf, size_t *size, char c)
2104 {
2105 if (*size) {
2106 char __user **buffer = (char __user **)buf;
2107 if (put_user(c, *buffer))
2108 return -EFAULT;
2109 (*size)--, (*buffer)++;
2110 *buf = *buffer;
2111 }
2112 return 0;
2113 }
2114
2115 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2116 int *valp,
2117 int write, void *data)
2118 {
2119 if (write) {
2120 if (*negp) {
2121 if (*lvalp > (unsigned long) INT_MAX + 1)
2122 return -EINVAL;
2123 *valp = -*lvalp;
2124 } else {
2125 if (*lvalp > (unsigned long) INT_MAX)
2126 return -EINVAL;
2127 *valp = *lvalp;
2128 }
2129 } else {
2130 int val = *valp;
2131 if (val < 0) {
2132 *negp = true;
2133 *lvalp = -(unsigned long)val;
2134 } else {
2135 *negp = false;
2136 *lvalp = (unsigned long)val;
2137 }
2138 }
2139 return 0;
2140 }
2141
2142 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2143 int *valp,
2144 int write, void *data)
2145 {
2146 if (write) {
2147 if (*negp)
2148 return -EINVAL;
2149 *valp = *lvalp;
2150 } else {
2151 unsigned int val = *valp;
2152 *lvalp = (unsigned long)val;
2153 }
2154 return 0;
2155 }
2156
2157 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2158
2159 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2160 int write, void __user *buffer,
2161 size_t *lenp, loff_t *ppos,
2162 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2163 int write, void *data),
2164 void *data)
2165 {
2166 int *i, vleft, first = 1, err = 0;
2167 size_t left;
2168 char *kbuf = NULL, *p;
2169
2170 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2171 *lenp = 0;
2172 return 0;
2173 }
2174
2175 i = (int *) tbl_data;
2176 vleft = table->maxlen / sizeof(*i);
2177 left = *lenp;
2178
2179 if (!conv)
2180 conv = do_proc_dointvec_conv;
2181
2182 if (write) {
2183 if (*ppos) {
2184 switch (sysctl_writes_strict) {
2185 case SYSCTL_WRITES_STRICT:
2186 goto out;
2187 case SYSCTL_WRITES_WARN:
2188 warn_sysctl_write(table);
2189 break;
2190 default:
2191 break;
2192 }
2193 }
2194
2195 if (left > PAGE_SIZE - 1)
2196 left = PAGE_SIZE - 1;
2197 p = kbuf = memdup_user_nul(buffer, left);
2198 if (IS_ERR(kbuf))
2199 return PTR_ERR(kbuf);
2200 }
2201
2202 for (; left && vleft--; i++, first=0) {
2203 unsigned long lval;
2204 bool neg;
2205
2206 if (write) {
2207 left -= proc_skip_spaces(&p);
2208
2209 if (!left)
2210 break;
2211 err = proc_get_long(&p, &left, &lval, &neg,
2212 proc_wspace_sep,
2213 sizeof(proc_wspace_sep), NULL);
2214 if (err)
2215 break;
2216 if (conv(&neg, &lval, i, 1, data)) {
2217 err = -EINVAL;
2218 break;
2219 }
2220 } else {
2221 if (conv(&neg, &lval, i, 0, data)) {
2222 err = -EINVAL;
2223 break;
2224 }
2225 if (!first)
2226 err = proc_put_char(&buffer, &left, '\t');
2227 if (err)
2228 break;
2229 err = proc_put_long(&buffer, &left, lval, neg);
2230 if (err)
2231 break;
2232 }
2233 }
2234
2235 if (!write && !first && left && !err)
2236 err = proc_put_char(&buffer, &left, '\n');
2237 if (write && !err && left)
2238 left -= proc_skip_spaces(&p);
2239 if (write) {
2240 kfree(kbuf);
2241 if (first)
2242 return err ? : -EINVAL;
2243 }
2244 *lenp -= left;
2245 out:
2246 *ppos += *lenp;
2247 return err;
2248 }
2249
2250 static int do_proc_dointvec(struct ctl_table *table, int write,
2251 void __user *buffer, size_t *lenp, loff_t *ppos,
2252 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2253 int write, void *data),
2254 void *data)
2255 {
2256 return __do_proc_dointvec(table->data, table, write,
2257 buffer, lenp, ppos, conv, data);
2258 }
2259
2260 /**
2261 * proc_dointvec - read a vector of integers
2262 * @table: the sysctl table
2263 * @write: %TRUE if this is a write to the sysctl file
2264 * @buffer: the user buffer
2265 * @lenp: the size of the user buffer
2266 * @ppos: file position
2267 *
2268 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2269 * values from/to the user buffer, treated as an ASCII string.
2270 *
2271 * Returns 0 on success.
2272 */
2273 int proc_dointvec(struct ctl_table *table, int write,
2274 void __user *buffer, size_t *lenp, loff_t *ppos)
2275 {
2276 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2277 }
2278
2279 /**
2280 * proc_douintvec - read a vector of unsigned integers
2281 * @table: the sysctl table
2282 * @write: %TRUE if this is a write to the sysctl file
2283 * @buffer: the user buffer
2284 * @lenp: the size of the user buffer
2285 * @ppos: file position
2286 *
2287 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2288 * values from/to the user buffer, treated as an ASCII string.
2289 *
2290 * Returns 0 on success.
2291 */
2292 int proc_douintvec(struct ctl_table *table, int write,
2293 void __user *buffer, size_t *lenp, loff_t *ppos)
2294 {
2295 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2296 do_proc_douintvec_conv, NULL);
2297 }
2298
2299 /*
2300 * Taint values can only be increased
2301 * This means we can safely use a temporary.
2302 */
2303 static int proc_taint(struct ctl_table *table, int write,
2304 void __user *buffer, size_t *lenp, loff_t *ppos)
2305 {
2306 struct ctl_table t;
2307 unsigned long tmptaint = get_taint();
2308 int err;
2309
2310 if (write && !capable(CAP_SYS_ADMIN))
2311 return -EPERM;
2312
2313 t = *table;
2314 t.data = &tmptaint;
2315 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2316 if (err < 0)
2317 return err;
2318
2319 if (write) {
2320 /*
2321 * Poor man's atomic or. Not worth adding a primitive
2322 * to everyone's atomic.h for this
2323 */
2324 int i;
2325 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2326 if ((tmptaint >> i) & 1)
2327 add_taint(i, LOCKDEP_STILL_OK);
2328 }
2329 }
2330
2331 return err;
2332 }
2333
2334 #ifdef CONFIG_PRINTK
2335 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2336 void __user *buffer, size_t *lenp, loff_t *ppos)
2337 {
2338 if (write && !capable(CAP_SYS_ADMIN))
2339 return -EPERM;
2340
2341 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2342 }
2343 #endif
2344
2345 struct do_proc_dointvec_minmax_conv_param {
2346 int *min;
2347 int *max;
2348 };
2349
2350 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2351 int *valp,
2352 int write, void *data)
2353 {
2354 struct do_proc_dointvec_minmax_conv_param *param = data;
2355 if (write) {
2356 int val = *negp ? -*lvalp : *lvalp;
2357 if ((param->min && *param->min > val) ||
2358 (param->max && *param->max < val))
2359 return -EINVAL;
2360 *valp = val;
2361 } else {
2362 int val = *valp;
2363 if (val < 0) {
2364 *negp = true;
2365 *lvalp = -(unsigned long)val;
2366 } else {
2367 *negp = false;
2368 *lvalp = (unsigned long)val;
2369 }
2370 }
2371 return 0;
2372 }
2373
2374 /**
2375 * proc_dointvec_minmax - read a vector of integers with min/max values
2376 * @table: the sysctl table
2377 * @write: %TRUE if this is a write to the sysctl file
2378 * @buffer: the user buffer
2379 * @lenp: the size of the user buffer
2380 * @ppos: file position
2381 *
2382 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2383 * values from/to the user buffer, treated as an ASCII string.
2384 *
2385 * This routine will ensure the values are within the range specified by
2386 * table->extra1 (min) and table->extra2 (max).
2387 *
2388 * Returns 0 on success.
2389 */
2390 int proc_dointvec_minmax(struct ctl_table *table, int write,
2391 void __user *buffer, size_t *lenp, loff_t *ppos)
2392 {
2393 struct do_proc_dointvec_minmax_conv_param param = {
2394 .min = (int *) table->extra1,
2395 .max = (int *) table->extra2,
2396 };
2397 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2398 do_proc_dointvec_minmax_conv, &param);
2399 }
2400
2401 static void validate_coredump_safety(void)
2402 {
2403 #ifdef CONFIG_COREDUMP
2404 if (suid_dumpable == SUID_DUMP_ROOT &&
2405 core_pattern[0] != '/' && core_pattern[0] != '|') {
2406 printk(KERN_WARNING "Unsafe core_pattern used with "\
2407 "suid_dumpable=2. Pipe handler or fully qualified "\
2408 "core dump path required.\n");
2409 }
2410 #endif
2411 }
2412
2413 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2414 void __user *buffer, size_t *lenp, loff_t *ppos)
2415 {
2416 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2417 if (!error)
2418 validate_coredump_safety();
2419 return error;
2420 }
2421
2422 #ifdef CONFIG_COREDUMP
2423 static int proc_dostring_coredump(struct ctl_table *table, int write,
2424 void __user *buffer, size_t *lenp, loff_t *ppos)
2425 {
2426 int error = proc_dostring(table, write, buffer, lenp, ppos);
2427 if (!error)
2428 validate_coredump_safety();
2429 return error;
2430 }
2431 #endif
2432
2433 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2434 void __user *buffer,
2435 size_t *lenp, loff_t *ppos,
2436 unsigned long convmul,
2437 unsigned long convdiv)
2438 {
2439 unsigned long *i, *min, *max;
2440 int vleft, first = 1, err = 0;
2441 size_t left;
2442 char *kbuf = NULL, *p;
2443
2444 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2445 *lenp = 0;
2446 return 0;
2447 }
2448
2449 i = (unsigned long *) data;
2450 min = (unsigned long *) table->extra1;
2451 max = (unsigned long *) table->extra2;
2452 vleft = table->maxlen / sizeof(unsigned long);
2453 left = *lenp;
2454
2455 if (write) {
2456 if (*ppos) {
2457 switch (sysctl_writes_strict) {
2458 case SYSCTL_WRITES_STRICT:
2459 goto out;
2460 case SYSCTL_WRITES_WARN:
2461 warn_sysctl_write(table);
2462 break;
2463 default:
2464 break;
2465 }
2466 }
2467
2468 if (left > PAGE_SIZE - 1)
2469 left = PAGE_SIZE - 1;
2470 p = kbuf = memdup_user_nul(buffer, left);
2471 if (IS_ERR(kbuf))
2472 return PTR_ERR(kbuf);
2473 }
2474
2475 for (; left && vleft--; i++, first = 0) {
2476 unsigned long val;
2477
2478 if (write) {
2479 bool neg;
2480
2481 left -= proc_skip_spaces(&p);
2482
2483 err = proc_get_long(&p, &left, &val, &neg,
2484 proc_wspace_sep,
2485 sizeof(proc_wspace_sep), NULL);
2486 if (err)
2487 break;
2488 if (neg)
2489 continue;
2490 if ((min && val < *min) || (max && val > *max))
2491 continue;
2492 *i = val;
2493 } else {
2494 val = convdiv * (*i) / convmul;
2495 if (!first) {
2496 err = proc_put_char(&buffer, &left, '\t');
2497 if (err)
2498 break;
2499 }
2500 err = proc_put_long(&buffer, &left, val, false);
2501 if (err)
2502 break;
2503 }
2504 }
2505
2506 if (!write && !first && left && !err)
2507 err = proc_put_char(&buffer, &left, '\n');
2508 if (write && !err)
2509 left -= proc_skip_spaces(&p);
2510 if (write) {
2511 kfree(kbuf);
2512 if (first)
2513 return err ? : -EINVAL;
2514 }
2515 *lenp -= left;
2516 out:
2517 *ppos += *lenp;
2518 return err;
2519 }
2520
2521 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2522 void __user *buffer,
2523 size_t *lenp, loff_t *ppos,
2524 unsigned long convmul,
2525 unsigned long convdiv)
2526 {
2527 return __do_proc_doulongvec_minmax(table->data, table, write,
2528 buffer, lenp, ppos, convmul, convdiv);
2529 }
2530
2531 /**
2532 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2533 * @table: the sysctl table
2534 * @write: %TRUE if this is a write to the sysctl file
2535 * @buffer: the user buffer
2536 * @lenp: the size of the user buffer
2537 * @ppos: file position
2538 *
2539 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2540 * values from/to the user buffer, treated as an ASCII string.
2541 *
2542 * This routine will ensure the values are within the range specified by
2543 * table->extra1 (min) and table->extra2 (max).
2544 *
2545 * Returns 0 on success.
2546 */
2547 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2548 void __user *buffer, size_t *lenp, loff_t *ppos)
2549 {
2550 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2551 }
2552
2553 /**
2554 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2555 * @table: the sysctl table
2556 * @write: %TRUE if this is a write to the sysctl file
2557 * @buffer: the user buffer
2558 * @lenp: the size of the user buffer
2559 * @ppos: file position
2560 *
2561 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2562 * values from/to the user buffer, treated as an ASCII string. The values
2563 * are treated as milliseconds, and converted to jiffies when they are stored.
2564 *
2565 * This routine will ensure the values are within the range specified by
2566 * table->extra1 (min) and table->extra2 (max).
2567 *
2568 * Returns 0 on success.
2569 */
2570 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2571 void __user *buffer,
2572 size_t *lenp, loff_t *ppos)
2573 {
2574 return do_proc_doulongvec_minmax(table, write, buffer,
2575 lenp, ppos, HZ, 1000l);
2576 }
2577
2578
2579 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2580 int *valp,
2581 int write, void *data)
2582 {
2583 if (write) {
2584 if (*lvalp > LONG_MAX / HZ)
2585 return 1;
2586 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2587 } else {
2588 int val = *valp;
2589 unsigned long lval;
2590 if (val < 0) {
2591 *negp = true;
2592 lval = -(unsigned long)val;
2593 } else {
2594 *negp = false;
2595 lval = (unsigned long)val;
2596 }
2597 *lvalp = lval / HZ;
2598 }
2599 return 0;
2600 }
2601
2602 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2603 int *valp,
2604 int write, void *data)
2605 {
2606 if (write) {
2607 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2608 return 1;
2609 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2610 } else {
2611 int val = *valp;
2612 unsigned long lval;
2613 if (val < 0) {
2614 *negp = true;
2615 lval = -(unsigned long)val;
2616 } else {
2617 *negp = false;
2618 lval = (unsigned long)val;
2619 }
2620 *lvalp = jiffies_to_clock_t(lval);
2621 }
2622 return 0;
2623 }
2624
2625 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2626 int *valp,
2627 int write, void *data)
2628 {
2629 if (write) {
2630 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2631
2632 if (jif > INT_MAX)
2633 return 1;
2634 *valp = (int)jif;
2635 } else {
2636 int val = *valp;
2637 unsigned long lval;
2638 if (val < 0) {
2639 *negp = true;
2640 lval = -(unsigned long)val;
2641 } else {
2642 *negp = false;
2643 lval = (unsigned long)val;
2644 }
2645 *lvalp = jiffies_to_msecs(lval);
2646 }
2647 return 0;
2648 }
2649
2650 /**
2651 * proc_dointvec_jiffies - read a vector of integers as seconds
2652 * @table: the sysctl table
2653 * @write: %TRUE if this is a write to the sysctl file
2654 * @buffer: the user buffer
2655 * @lenp: the size of the user buffer
2656 * @ppos: file position
2657 *
2658 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2659 * values from/to the user buffer, treated as an ASCII string.
2660 * The values read are assumed to be in seconds, and are converted into
2661 * jiffies.
2662 *
2663 * Returns 0 on success.
2664 */
2665 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2666 void __user *buffer, size_t *lenp, loff_t *ppos)
2667 {
2668 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2669 do_proc_dointvec_jiffies_conv,NULL);
2670 }
2671
2672 /**
2673 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2674 * @table: the sysctl table
2675 * @write: %TRUE if this is a write to the sysctl file
2676 * @buffer: the user buffer
2677 * @lenp: the size of the user buffer
2678 * @ppos: pointer to the file position
2679 *
2680 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2681 * values from/to the user buffer, treated as an ASCII string.
2682 * The values read are assumed to be in 1/USER_HZ seconds, and
2683 * are converted into jiffies.
2684 *
2685 * Returns 0 on success.
2686 */
2687 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2688 void __user *buffer, size_t *lenp, loff_t *ppos)
2689 {
2690 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2691 do_proc_dointvec_userhz_jiffies_conv,NULL);
2692 }
2693
2694 /**
2695 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2696 * @table: the sysctl table
2697 * @write: %TRUE if this is a write to the sysctl file
2698 * @buffer: the user buffer
2699 * @lenp: the size of the user buffer
2700 * @ppos: file position
2701 * @ppos: the current position in the file
2702 *
2703 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2704 * values from/to the user buffer, treated as an ASCII string.
2705 * The values read are assumed to be in 1/1000 seconds, and
2706 * are converted into jiffies.
2707 *
2708 * Returns 0 on success.
2709 */
2710 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2711 void __user *buffer, size_t *lenp, loff_t *ppos)
2712 {
2713 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2714 do_proc_dointvec_ms_jiffies_conv, NULL);
2715 }
2716
2717 static int proc_do_cad_pid(struct ctl_table *table, int write,
2718 void __user *buffer, size_t *lenp, loff_t *ppos)
2719 {
2720 struct pid *new_pid;
2721 pid_t tmp;
2722 int r;
2723
2724 tmp = pid_vnr(cad_pid);
2725
2726 r = __do_proc_dointvec(&tmp, table, write, buffer,
2727 lenp, ppos, NULL, NULL);
2728 if (r || !write)
2729 return r;
2730
2731 new_pid = find_get_pid(tmp);
2732 if (!new_pid)
2733 return -ESRCH;
2734
2735 put_pid(xchg(&cad_pid, new_pid));
2736 return 0;
2737 }
2738
2739 /**
2740 * proc_do_large_bitmap - read/write from/to a large bitmap
2741 * @table: the sysctl table
2742 * @write: %TRUE if this is a write to the sysctl file
2743 * @buffer: the user buffer
2744 * @lenp: the size of the user buffer
2745 * @ppos: file position
2746 *
2747 * The bitmap is stored at table->data and the bitmap length (in bits)
2748 * in table->maxlen.
2749 *
2750 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2751 * large bitmaps may be represented in a compact manner. Writing into
2752 * the file will clear the bitmap then update it with the given input.
2753 *
2754 * Returns 0 on success.
2755 */
2756 int proc_do_large_bitmap(struct ctl_table *table, int write,
2757 void __user *buffer, size_t *lenp, loff_t *ppos)
2758 {
2759 int err = 0;
2760 bool first = 1;
2761 size_t left = *lenp;
2762 unsigned long bitmap_len = table->maxlen;
2763 unsigned long *bitmap = *(unsigned long **) table->data;
2764 unsigned long *tmp_bitmap = NULL;
2765 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2766
2767 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2768 *lenp = 0;
2769 return 0;
2770 }
2771
2772 if (write) {
2773 char *kbuf, *p;
2774
2775 if (left > PAGE_SIZE - 1)
2776 left = PAGE_SIZE - 1;
2777
2778 p = kbuf = memdup_user_nul(buffer, left);
2779 if (IS_ERR(kbuf))
2780 return PTR_ERR(kbuf);
2781
2782 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2783 GFP_KERNEL);
2784 if (!tmp_bitmap) {
2785 kfree(kbuf);
2786 return -ENOMEM;
2787 }
2788 proc_skip_char(&p, &left, '\n');
2789 while (!err && left) {
2790 unsigned long val_a, val_b;
2791 bool neg;
2792
2793 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2794 sizeof(tr_a), &c);
2795 if (err)
2796 break;
2797 if (val_a >= bitmap_len || neg) {
2798 err = -EINVAL;
2799 break;
2800 }
2801
2802 val_b = val_a;
2803 if (left) {
2804 p++;
2805 left--;
2806 }
2807
2808 if (c == '-') {
2809 err = proc_get_long(&p, &left, &val_b,
2810 &neg, tr_b, sizeof(tr_b),
2811 &c);
2812 if (err)
2813 break;
2814 if (val_b >= bitmap_len || neg ||
2815 val_a > val_b) {
2816 err = -EINVAL;
2817 break;
2818 }
2819 if (left) {
2820 p++;
2821 left--;
2822 }
2823 }
2824
2825 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2826 first = 0;
2827 proc_skip_char(&p, &left, '\n');
2828 }
2829 kfree(kbuf);
2830 } else {
2831 unsigned long bit_a, bit_b = 0;
2832
2833 while (left) {
2834 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2835 if (bit_a >= bitmap_len)
2836 break;
2837 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2838 bit_a + 1) - 1;
2839
2840 if (!first) {
2841 err = proc_put_char(&buffer, &left, ',');
2842 if (err)
2843 break;
2844 }
2845 err = proc_put_long(&buffer, &left, bit_a, false);
2846 if (err)
2847 break;
2848 if (bit_a != bit_b) {
2849 err = proc_put_char(&buffer, &left, '-');
2850 if (err)
2851 break;
2852 err = proc_put_long(&buffer, &left, bit_b, false);
2853 if (err)
2854 break;
2855 }
2856
2857 first = 0; bit_b++;
2858 }
2859 if (!err)
2860 err = proc_put_char(&buffer, &left, '\n');
2861 }
2862
2863 if (!err) {
2864 if (write) {
2865 if (*ppos)
2866 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2867 else
2868 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2869 }
2870 kfree(tmp_bitmap);
2871 *lenp -= left;
2872 *ppos += *lenp;
2873 return 0;
2874 } else {
2875 kfree(tmp_bitmap);
2876 return err;
2877 }
2878 }
2879
2880 #else /* CONFIG_PROC_SYSCTL */
2881
2882 int proc_dostring(struct ctl_table *table, int write,
2883 void __user *buffer, size_t *lenp, loff_t *ppos)
2884 {
2885 return -ENOSYS;
2886 }
2887
2888 int proc_dointvec(struct ctl_table *table, int write,
2889 void __user *buffer, size_t *lenp, loff_t *ppos)
2890 {
2891 return -ENOSYS;
2892 }
2893
2894 int proc_douintvec(struct ctl_table *table, int write,
2895 void __user *buffer, size_t *lenp, loff_t *ppos)
2896 {
2897 return -ENOSYS;
2898 }
2899
2900 int proc_dointvec_minmax(struct ctl_table *table, int write,
2901 void __user *buffer, size_t *lenp, loff_t *ppos)
2902 {
2903 return -ENOSYS;
2904 }
2905
2906 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2907 void __user *buffer, size_t *lenp, loff_t *ppos)
2908 {
2909 return -ENOSYS;
2910 }
2911
2912 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2913 void __user *buffer, size_t *lenp, loff_t *ppos)
2914 {
2915 return -ENOSYS;
2916 }
2917
2918 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2919 void __user *buffer, size_t *lenp, loff_t *ppos)
2920 {
2921 return -ENOSYS;
2922 }
2923
2924 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2925 void __user *buffer, size_t *lenp, loff_t *ppos)
2926 {
2927 return -ENOSYS;
2928 }
2929
2930 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2931 void __user *buffer,
2932 size_t *lenp, loff_t *ppos)
2933 {
2934 return -ENOSYS;
2935 }
2936
2937
2938 #endif /* CONFIG_PROC_SYSCTL */
2939
2940 /*
2941 * No sense putting this after each symbol definition, twice,
2942 * exception granted :-)
2943 */
2944 EXPORT_SYMBOL(proc_dointvec);
2945 EXPORT_SYMBOL(proc_douintvec);
2946 EXPORT_SYMBOL(proc_dointvec_jiffies);
2947 EXPORT_SYMBOL(proc_dointvec_minmax);
2948 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2949 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2950 EXPORT_SYMBOL(proc_dostring);
2951 EXPORT_SYMBOL(proc_doulongvec_minmax);
2952 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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