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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-bionic-kernel.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/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/sched/coredump.h>
67 #include <linux/kexec.h>
68 #include <linux/bpf.h>
69 #include <linux/mount.h>
70
71 #include <linux/uaccess.h>
72 #include <asm/processor.h>
73
74 #ifdef CONFIG_X86
75 #include <asm/nmi.h>
76 #include <asm/stacktrace.h>
77 #include <asm/io.h>
78 #endif
79 #ifdef CONFIG_SPARC
80 #include <asm/setup.h>
81 #endif
82 #ifdef CONFIG_BSD_PROCESS_ACCT
83 #include <linux/acct.h>
84 #endif
85 #ifdef CONFIG_RT_MUTEXES
86 #include <linux/rtmutex.h>
87 #endif
88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89 #include <linux/lockdep.h>
90 #endif
91 #ifdef CONFIG_CHR_DEV_SG
92 #include <scsi/sg.h>
93 #endif
94
95 #ifdef CONFIG_LOCKUP_DETECTOR
96 #include <linux/nmi.h>
97 #endif
98
99 #if defined(CONFIG_SYSCTL)
100
101 /* External variables not in a header file. */
102 extern int suid_dumpable;
103 #ifdef CONFIG_COREDUMP
104 extern int core_uses_pid;
105 extern char core_pattern[];
106 extern unsigned int core_pipe_limit;
107 #endif
108 extern int pid_max;
109 extern int pid_max_min, pid_max_max;
110 extern int percpu_pagelist_fraction;
111 extern int latencytop_enabled;
112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
113 #ifndef CONFIG_MMU
114 extern int sysctl_nr_trim_pages;
115 #endif
116
117 /* Constants used for minimum and maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty = 60;
120 #endif
121
122 static int __maybe_unused neg_one = -1;
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused four = 4;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 static int one_thousand = 1000;
131 #ifdef CONFIG_PRINTK
132 static int ten_thousand = 10000;
133 #endif
134 #ifdef CONFIG_PERF_EVENTS
135 static int six_hundred_forty_kb = 640 * 1024;
136 #endif
137
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
144
145 static int ngroups_max = NGROUPS_MAX;
146 static const int cap_last_cap = CAP_LAST_CAP;
147
148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149 #ifdef CONFIG_DETECT_HUNG_TASK
150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
151 #endif
152
153 #ifdef CONFIG_INOTIFY_USER
154 #include <linux/inotify.h>
155 #endif
156 #ifdef CONFIG_SPARC
157 #endif
158
159 #ifdef __hppa__
160 extern int pwrsw_enabled;
161 #endif
162
163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164 extern int unaligned_enabled;
165 #endif
166
167 #ifdef CONFIG_IA64
168 extern int unaligned_dump_stack;
169 #endif
170
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172 extern int no_unaligned_warning;
173 #endif
174
175 #ifdef CONFIG_PROC_SYSCTL
176
177 #define SYSCTL_WRITES_LEGACY -1
178 #define SYSCTL_WRITES_WARN 0
179 #define SYSCTL_WRITES_STRICT 1
180
181 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
182
183 static int proc_do_cad_pid(struct ctl_table *table, int write,
184 void __user *buffer, size_t *lenp, loff_t *ppos);
185 static int proc_taint(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
187 #endif
188
189 #ifdef CONFIG_PRINTK
190 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos);
192 #endif
193
194 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
195 void __user *buffer, size_t *lenp, loff_t *ppos);
196 #ifdef CONFIG_COREDUMP
197 static int proc_dostring_coredump(struct ctl_table *table, int write,
198 void __user *buffer, size_t *lenp, loff_t *ppos);
199 #endif
200
201 #ifdef CONFIG_MAGIC_SYSRQ
202 /* Note: sysrq code uses it's own private copy */
203 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
204
205 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
206 void __user *buffer, size_t *lenp,
207 loff_t *ppos)
208 {
209 int error;
210
211 error = proc_dointvec(table, write, buffer, lenp, ppos);
212 if (error)
213 return error;
214
215 if (write)
216 sysrq_toggle_support(__sysrq_enabled);
217
218 return 0;
219 }
220
221 #endif
222
223 static struct ctl_table kern_table[];
224 static struct ctl_table vm_table[];
225 static struct ctl_table fs_table[];
226 static struct ctl_table debug_table[];
227 static struct ctl_table dev_table[];
228 extern struct ctl_table random_table[];
229 #ifdef CONFIG_EPOLL
230 extern struct ctl_table epoll_table[];
231 #endif
232
233 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
234 int sysctl_legacy_va_layout;
235 #endif
236
237 /* The default sysctl tables: */
238
239 static struct ctl_table sysctl_base_table[] = {
240 {
241 .procname = "kernel",
242 .mode = 0555,
243 .child = kern_table,
244 },
245 {
246 .procname = "vm",
247 .mode = 0555,
248 .child = vm_table,
249 },
250 {
251 .procname = "fs",
252 .mode = 0555,
253 .child = fs_table,
254 },
255 {
256 .procname = "debug",
257 .mode = 0555,
258 .child = debug_table,
259 },
260 {
261 .procname = "dev",
262 .mode = 0555,
263 .child = dev_table,
264 },
265 { }
266 };
267
268 #ifdef CONFIG_SCHED_DEBUG
269 static int min_sched_granularity_ns = 100000; /* 100 usecs */
270 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
271 static int min_wakeup_granularity_ns; /* 0 usecs */
272 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
273 #ifdef CONFIG_SMP
274 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
275 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
276 #endif /* CONFIG_SMP */
277 #endif /* CONFIG_SCHED_DEBUG */
278
279 #ifdef CONFIG_COMPACTION
280 static int min_extfrag_threshold;
281 static int max_extfrag_threshold = 1000;
282 #endif
283
284 static struct ctl_table kern_table[] = {
285 {
286 .procname = "sched_child_runs_first",
287 .data = &sysctl_sched_child_runs_first,
288 .maxlen = sizeof(unsigned int),
289 .mode = 0644,
290 .proc_handler = proc_dointvec,
291 },
292 #ifdef CONFIG_SCHED_DEBUG
293 {
294 .procname = "sched_min_granularity_ns",
295 .data = &sysctl_sched_min_granularity,
296 .maxlen = sizeof(unsigned int),
297 .mode = 0644,
298 .proc_handler = sched_proc_update_handler,
299 .extra1 = &min_sched_granularity_ns,
300 .extra2 = &max_sched_granularity_ns,
301 },
302 {
303 .procname = "sched_latency_ns",
304 .data = &sysctl_sched_latency,
305 .maxlen = sizeof(unsigned int),
306 .mode = 0644,
307 .proc_handler = sched_proc_update_handler,
308 .extra1 = &min_sched_granularity_ns,
309 .extra2 = &max_sched_granularity_ns,
310 },
311 {
312 .procname = "sched_wakeup_granularity_ns",
313 .data = &sysctl_sched_wakeup_granularity,
314 .maxlen = sizeof(unsigned int),
315 .mode = 0644,
316 .proc_handler = sched_proc_update_handler,
317 .extra1 = &min_wakeup_granularity_ns,
318 .extra2 = &max_wakeup_granularity_ns,
319 },
320 #ifdef CONFIG_SMP
321 {
322 .procname = "sched_tunable_scaling",
323 .data = &sysctl_sched_tunable_scaling,
324 .maxlen = sizeof(enum sched_tunable_scaling),
325 .mode = 0644,
326 .proc_handler = sched_proc_update_handler,
327 .extra1 = &min_sched_tunable_scaling,
328 .extra2 = &max_sched_tunable_scaling,
329 },
330 {
331 .procname = "sched_migration_cost_ns",
332 .data = &sysctl_sched_migration_cost,
333 .maxlen = sizeof(unsigned int),
334 .mode = 0644,
335 .proc_handler = proc_dointvec,
336 },
337 {
338 .procname = "sched_nr_migrate",
339 .data = &sysctl_sched_nr_migrate,
340 .maxlen = sizeof(unsigned int),
341 .mode = 0644,
342 .proc_handler = proc_dointvec,
343 },
344 {
345 .procname = "sched_time_avg_ms",
346 .data = &sysctl_sched_time_avg,
347 .maxlen = sizeof(unsigned int),
348 .mode = 0644,
349 .proc_handler = proc_dointvec,
350 },
351 #ifdef CONFIG_SCHEDSTATS
352 {
353 .procname = "sched_schedstats",
354 .data = NULL,
355 .maxlen = sizeof(unsigned int),
356 .mode = 0644,
357 .proc_handler = sysctl_schedstats,
358 .extra1 = &zero,
359 .extra2 = &one,
360 },
361 #endif /* CONFIG_SCHEDSTATS */
362 #endif /* CONFIG_SMP */
363 #ifdef CONFIG_NUMA_BALANCING
364 {
365 .procname = "numa_balancing_scan_delay_ms",
366 .data = &sysctl_numa_balancing_scan_delay,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec,
370 },
371 {
372 .procname = "numa_balancing_scan_period_min_ms",
373 .data = &sysctl_numa_balancing_scan_period_min,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
378 {
379 .procname = "numa_balancing_scan_period_max_ms",
380 .data = &sysctl_numa_balancing_scan_period_max,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec,
384 },
385 {
386 .procname = "numa_balancing_scan_size_mb",
387 .data = &sysctl_numa_balancing_scan_size,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec_minmax,
391 .extra1 = &one,
392 },
393 {
394 .procname = "numa_balancing",
395 .data = NULL, /* filled in by handler */
396 .maxlen = sizeof(unsigned int),
397 .mode = 0644,
398 .proc_handler = sysctl_numa_balancing,
399 .extra1 = &zero,
400 .extra2 = &one,
401 },
402 #endif /* CONFIG_NUMA_BALANCING */
403 #endif /* CONFIG_SCHED_DEBUG */
404 {
405 .procname = "sched_rt_period_us",
406 .data = &sysctl_sched_rt_period,
407 .maxlen = sizeof(unsigned int),
408 .mode = 0644,
409 .proc_handler = sched_rt_handler,
410 },
411 {
412 .procname = "sched_rt_runtime_us",
413 .data = &sysctl_sched_rt_runtime,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = sched_rt_handler,
417 },
418 {
419 .procname = "sched_rr_timeslice_ms",
420 .data = &sysctl_sched_rr_timeslice,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = sched_rr_handler,
424 },
425 #ifdef CONFIG_SCHED_AUTOGROUP
426 {
427 .procname = "sched_autogroup_enabled",
428 .data = &sysctl_sched_autogroup_enabled,
429 .maxlen = sizeof(unsigned int),
430 .mode = 0644,
431 .proc_handler = proc_dointvec_minmax,
432 .extra1 = &zero,
433 .extra2 = &one,
434 },
435 #endif
436 #ifdef CONFIG_CFS_BANDWIDTH
437 {
438 .procname = "sched_cfs_bandwidth_slice_us",
439 .data = &sysctl_sched_cfs_bandwidth_slice,
440 .maxlen = sizeof(unsigned int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec_minmax,
443 .extra1 = &one,
444 },
445 #endif
446 #ifdef CONFIG_PROVE_LOCKING
447 {
448 .procname = "prove_locking",
449 .data = &prove_locking,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = proc_dointvec,
453 },
454 #endif
455 #ifdef CONFIG_LOCK_STAT
456 {
457 .procname = "lock_stat",
458 .data = &lock_stat,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec,
462 },
463 #endif
464 {
465 .procname = "panic",
466 .data = &panic_timeout,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec,
470 },
471 #ifdef CONFIG_COREDUMP
472 {
473 .procname = "core_uses_pid",
474 .data = &core_uses_pid,
475 .maxlen = sizeof(int),
476 .mode = 0644,
477 .proc_handler = proc_dointvec,
478 },
479 {
480 .procname = "core_pattern",
481 .data = core_pattern,
482 .maxlen = CORENAME_MAX_SIZE,
483 .mode = 0644,
484 .proc_handler = proc_dostring_coredump,
485 },
486 {
487 .procname = "core_pipe_limit",
488 .data = &core_pipe_limit,
489 .maxlen = sizeof(unsigned int),
490 .mode = 0644,
491 .proc_handler = proc_dointvec,
492 },
493 #endif
494 #ifdef CONFIG_PROC_SYSCTL
495 {
496 .procname = "tainted",
497 .maxlen = sizeof(long),
498 .mode = 0644,
499 .proc_handler = proc_taint,
500 },
501 {
502 .procname = "sysctl_writes_strict",
503 .data = &sysctl_writes_strict,
504 .maxlen = sizeof(int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec_minmax,
507 .extra1 = &neg_one,
508 .extra2 = &one,
509 },
510 #endif
511 #ifdef CONFIG_LATENCYTOP
512 {
513 .procname = "latencytop",
514 .data = &latencytop_enabled,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = sysctl_latencytop,
518 },
519 #endif
520 #ifdef CONFIG_BLK_DEV_INITRD
521 {
522 .procname = "real-root-dev",
523 .data = &real_root_dev,
524 .maxlen = sizeof(int),
525 .mode = 0644,
526 .proc_handler = proc_dointvec,
527 },
528 #endif
529 {
530 .procname = "print-fatal-signals",
531 .data = &print_fatal_signals,
532 .maxlen = sizeof(int),
533 .mode = 0644,
534 .proc_handler = proc_dointvec,
535 },
536 #ifdef CONFIG_SPARC
537 {
538 .procname = "reboot-cmd",
539 .data = reboot_command,
540 .maxlen = 256,
541 .mode = 0644,
542 .proc_handler = proc_dostring,
543 },
544 {
545 .procname = "stop-a",
546 .data = &stop_a_enabled,
547 .maxlen = sizeof (int),
548 .mode = 0644,
549 .proc_handler = proc_dointvec,
550 },
551 {
552 .procname = "scons-poweroff",
553 .data = &scons_pwroff,
554 .maxlen = sizeof (int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec,
557 },
558 #endif
559 #ifdef CONFIG_SPARC64
560 {
561 .procname = "tsb-ratio",
562 .data = &sysctl_tsb_ratio,
563 .maxlen = sizeof (int),
564 .mode = 0644,
565 .proc_handler = proc_dointvec,
566 },
567 #endif
568 #ifdef __hppa__
569 {
570 .procname = "soft-power",
571 .data = &pwrsw_enabled,
572 .maxlen = sizeof (int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec,
575 },
576 #endif
577 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
578 {
579 .procname = "unaligned-trap",
580 .data = &unaligned_enabled,
581 .maxlen = sizeof (int),
582 .mode = 0644,
583 .proc_handler = proc_dointvec,
584 },
585 #endif
586 {
587 .procname = "ctrl-alt-del",
588 .data = &C_A_D,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec,
592 },
593 #ifdef CONFIG_FUNCTION_TRACER
594 {
595 .procname = "ftrace_enabled",
596 .data = &ftrace_enabled,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = ftrace_enable_sysctl,
600 },
601 #endif
602 #ifdef CONFIG_STACK_TRACER
603 {
604 .procname = "stack_tracer_enabled",
605 .data = &stack_tracer_enabled,
606 .maxlen = sizeof(int),
607 .mode = 0644,
608 .proc_handler = stack_trace_sysctl,
609 },
610 #endif
611 #ifdef CONFIG_TRACING
612 {
613 .procname = "ftrace_dump_on_oops",
614 .data = &ftrace_dump_on_oops,
615 .maxlen = sizeof(int),
616 .mode = 0644,
617 .proc_handler = proc_dointvec,
618 },
619 {
620 .procname = "traceoff_on_warning",
621 .data = &__disable_trace_on_warning,
622 .maxlen = sizeof(__disable_trace_on_warning),
623 .mode = 0644,
624 .proc_handler = proc_dointvec,
625 },
626 {
627 .procname = "tracepoint_printk",
628 .data = &tracepoint_printk,
629 .maxlen = sizeof(tracepoint_printk),
630 .mode = 0644,
631 .proc_handler = tracepoint_printk_sysctl,
632 },
633 #endif
634 #ifdef CONFIG_KEXEC_CORE
635 {
636 .procname = "kexec_load_disabled",
637 .data = &kexec_load_disabled,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 /* only handle a transition from default "0" to "1" */
641 .proc_handler = proc_dointvec_minmax,
642 .extra1 = &one,
643 .extra2 = &one,
644 },
645 #endif
646 #ifdef CONFIG_MODULES
647 {
648 .procname = "modprobe",
649 .data = &modprobe_path,
650 .maxlen = KMOD_PATH_LEN,
651 .mode = 0644,
652 .proc_handler = proc_dostring,
653 },
654 {
655 .procname = "modules_disabled",
656 .data = &modules_disabled,
657 .maxlen = sizeof(int),
658 .mode = 0644,
659 /* only handle a transition from default "0" to "1" */
660 .proc_handler = proc_dointvec_minmax,
661 .extra1 = &one,
662 .extra2 = &one,
663 },
664 #endif
665 #ifdef CONFIG_UEVENT_HELPER
666 {
667 .procname = "hotplug",
668 .data = &uevent_helper,
669 .maxlen = UEVENT_HELPER_PATH_LEN,
670 .mode = 0644,
671 .proc_handler = proc_dostring,
672 },
673 #endif
674 #ifdef CONFIG_CHR_DEV_SG
675 {
676 .procname = "sg-big-buff",
677 .data = &sg_big_buff,
678 .maxlen = sizeof (int),
679 .mode = 0444,
680 .proc_handler = proc_dointvec,
681 },
682 #endif
683 #ifdef CONFIG_BSD_PROCESS_ACCT
684 {
685 .procname = "acct",
686 .data = &acct_parm,
687 .maxlen = 3*sizeof(int),
688 .mode = 0644,
689 .proc_handler = proc_dointvec,
690 },
691 #endif
692 #ifdef CONFIG_MAGIC_SYSRQ
693 {
694 .procname = "sysrq",
695 .data = &__sysrq_enabled,
696 .maxlen = sizeof (int),
697 .mode = 0644,
698 .proc_handler = sysrq_sysctl_handler,
699 },
700 #endif
701 #ifdef CONFIG_PROC_SYSCTL
702 {
703 .procname = "cad_pid",
704 .data = NULL,
705 .maxlen = sizeof (int),
706 .mode = 0600,
707 .proc_handler = proc_do_cad_pid,
708 },
709 #endif
710 {
711 .procname = "threads-max",
712 .data = NULL,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = sysctl_max_threads,
716 },
717 {
718 .procname = "random",
719 .mode = 0555,
720 .child = random_table,
721 },
722 {
723 .procname = "usermodehelper",
724 .mode = 0555,
725 .child = usermodehelper_table,
726 },
727 {
728 .procname = "overflowuid",
729 .data = &overflowuid,
730 .maxlen = sizeof(int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &minolduid,
734 .extra2 = &maxolduid,
735 },
736 {
737 .procname = "overflowgid",
738 .data = &overflowgid,
739 .maxlen = sizeof(int),
740 .mode = 0644,
741 .proc_handler = proc_dointvec_minmax,
742 .extra1 = &minolduid,
743 .extra2 = &maxolduid,
744 },
745 #ifdef CONFIG_S390
746 #ifdef CONFIG_MATHEMU
747 {
748 .procname = "ieee_emulation_warnings",
749 .data = &sysctl_ieee_emulation_warnings,
750 .maxlen = sizeof(int),
751 .mode = 0644,
752 .proc_handler = proc_dointvec,
753 },
754 #endif
755 {
756 .procname = "userprocess_debug",
757 .data = &show_unhandled_signals,
758 .maxlen = sizeof(int),
759 .mode = 0644,
760 .proc_handler = proc_dointvec,
761 },
762 #endif
763 {
764 .procname = "pid_max",
765 .data = &pid_max,
766 .maxlen = sizeof (int),
767 .mode = 0644,
768 .proc_handler = proc_dointvec_minmax,
769 .extra1 = &pid_max_min,
770 .extra2 = &pid_max_max,
771 },
772 {
773 .procname = "panic_on_oops",
774 .data = &panic_on_oops,
775 .maxlen = sizeof(int),
776 .mode = 0644,
777 .proc_handler = proc_dointvec,
778 },
779 #if defined CONFIG_PRINTK
780 {
781 .procname = "printk",
782 .data = &console_loglevel,
783 .maxlen = 4*sizeof(int),
784 .mode = 0644,
785 .proc_handler = proc_dointvec,
786 },
787 {
788 .procname = "printk_ratelimit",
789 .data = &printk_ratelimit_state.interval,
790 .maxlen = sizeof(int),
791 .mode = 0644,
792 .proc_handler = proc_dointvec_jiffies,
793 },
794 {
795 .procname = "printk_ratelimit_burst",
796 .data = &printk_ratelimit_state.burst,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec,
800 },
801 {
802 .procname = "printk_delay",
803 .data = &printk_delay_msec,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec_minmax,
807 .extra1 = &zero,
808 .extra2 = &ten_thousand,
809 },
810 {
811 .procname = "printk_devkmsg",
812 .data = devkmsg_log_str,
813 .maxlen = DEVKMSG_STR_MAX_SIZE,
814 .mode = 0644,
815 .proc_handler = devkmsg_sysctl_set_loglvl,
816 },
817 {
818 .procname = "dmesg_restrict",
819 .data = &dmesg_restrict,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dointvec_minmax_sysadmin,
823 .extra1 = &zero,
824 .extra2 = &one,
825 },
826 {
827 .procname = "kptr_restrict",
828 .data = &kptr_restrict,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec_minmax_sysadmin,
832 .extra1 = &zero,
833 .extra2 = &two,
834 },
835 #endif
836 {
837 .procname = "ngroups_max",
838 .data = &ngroups_max,
839 .maxlen = sizeof (int),
840 .mode = 0444,
841 .proc_handler = proc_dointvec,
842 },
843 {
844 .procname = "cap_last_cap",
845 .data = (void *)&cap_last_cap,
846 .maxlen = sizeof(int),
847 .mode = 0444,
848 .proc_handler = proc_dointvec,
849 },
850 #if defined(CONFIG_LOCKUP_DETECTOR)
851 {
852 .procname = "watchdog",
853 .data = &watchdog_user_enabled,
854 .maxlen = sizeof (int),
855 .mode = 0644,
856 .proc_handler = proc_watchdog,
857 .extra1 = &zero,
858 .extra2 = &one,
859 },
860 {
861 .procname = "watchdog_thresh",
862 .data = &watchdog_thresh,
863 .maxlen = sizeof(int),
864 .mode = 0644,
865 .proc_handler = proc_watchdog_thresh,
866 .extra1 = &zero,
867 .extra2 = &sixty,
868 },
869 {
870 .procname = "nmi_watchdog",
871 .data = &nmi_watchdog_enabled,
872 .maxlen = sizeof (int),
873 .mode = 0644,
874 .proc_handler = proc_nmi_watchdog,
875 .extra1 = &zero,
876 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
877 .extra2 = &one,
878 #else
879 .extra2 = &zero,
880 #endif
881 },
882 {
883 .procname = "soft_watchdog",
884 .data = &soft_watchdog_enabled,
885 .maxlen = sizeof (int),
886 .mode = 0644,
887 .proc_handler = proc_soft_watchdog,
888 .extra1 = &zero,
889 .extra2 = &one,
890 },
891 {
892 .procname = "watchdog_cpumask",
893 .data = &watchdog_cpumask_bits,
894 .maxlen = NR_CPUS,
895 .mode = 0644,
896 .proc_handler = proc_watchdog_cpumask,
897 },
898 {
899 .procname = "softlockup_panic",
900 .data = &softlockup_panic,
901 .maxlen = sizeof(int),
902 .mode = 0644,
903 .proc_handler = proc_dointvec_minmax,
904 .extra1 = &zero,
905 .extra2 = &one,
906 },
907 #ifdef CONFIG_HARDLOCKUP_DETECTOR
908 {
909 .procname = "hardlockup_panic",
910 .data = &hardlockup_panic,
911 .maxlen = sizeof(int),
912 .mode = 0644,
913 .proc_handler = proc_dointvec_minmax,
914 .extra1 = &zero,
915 .extra2 = &one,
916 },
917 #endif
918 #ifdef CONFIG_SMP
919 {
920 .procname = "softlockup_all_cpu_backtrace",
921 .data = &sysctl_softlockup_all_cpu_backtrace,
922 .maxlen = sizeof(int),
923 .mode = 0644,
924 .proc_handler = proc_dointvec_minmax,
925 .extra1 = &zero,
926 .extra2 = &one,
927 },
928 {
929 .procname = "hardlockup_all_cpu_backtrace",
930 .data = &sysctl_hardlockup_all_cpu_backtrace,
931 .maxlen = sizeof(int),
932 .mode = 0644,
933 .proc_handler = proc_dointvec_minmax,
934 .extra1 = &zero,
935 .extra2 = &one,
936 },
937 #endif /* CONFIG_SMP */
938 #endif
939 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
940 {
941 .procname = "unknown_nmi_panic",
942 .data = &unknown_nmi_panic,
943 .maxlen = sizeof (int),
944 .mode = 0644,
945 .proc_handler = proc_dointvec,
946 },
947 #endif
948 #if defined(CONFIG_X86)
949 {
950 .procname = "panic_on_unrecovered_nmi",
951 .data = &panic_on_unrecovered_nmi,
952 .maxlen = sizeof(int),
953 .mode = 0644,
954 .proc_handler = proc_dointvec,
955 },
956 {
957 .procname = "panic_on_io_nmi",
958 .data = &panic_on_io_nmi,
959 .maxlen = sizeof(int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec,
962 },
963 #ifdef CONFIG_DEBUG_STACKOVERFLOW
964 {
965 .procname = "panic_on_stackoverflow",
966 .data = &sysctl_panic_on_stackoverflow,
967 .maxlen = sizeof(int),
968 .mode = 0644,
969 .proc_handler = proc_dointvec,
970 },
971 #endif
972 {
973 .procname = "bootloader_type",
974 .data = &bootloader_type,
975 .maxlen = sizeof (int),
976 .mode = 0444,
977 .proc_handler = proc_dointvec,
978 },
979 {
980 .procname = "bootloader_version",
981 .data = &bootloader_version,
982 .maxlen = sizeof (int),
983 .mode = 0444,
984 .proc_handler = proc_dointvec,
985 },
986 {
987 .procname = "io_delay_type",
988 .data = &io_delay_type,
989 .maxlen = sizeof(int),
990 .mode = 0644,
991 .proc_handler = proc_dointvec,
992 },
993 #endif
994 #if defined(CONFIG_MMU)
995 {
996 .procname = "randomize_va_space",
997 .data = &randomize_va_space,
998 .maxlen = sizeof(int),
999 .mode = 0644,
1000 .proc_handler = proc_dointvec,
1001 },
1002 #endif
1003 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1004 {
1005 .procname = "spin_retry",
1006 .data = &spin_retry,
1007 .maxlen = sizeof (int),
1008 .mode = 0644,
1009 .proc_handler = proc_dointvec,
1010 },
1011 #endif
1012 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1013 {
1014 .procname = "acpi_video_flags",
1015 .data = &acpi_realmode_flags,
1016 .maxlen = sizeof (unsigned long),
1017 .mode = 0644,
1018 .proc_handler = proc_doulongvec_minmax,
1019 },
1020 #endif
1021 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1022 {
1023 .procname = "ignore-unaligned-usertrap",
1024 .data = &no_unaligned_warning,
1025 .maxlen = sizeof (int),
1026 .mode = 0644,
1027 .proc_handler = proc_dointvec,
1028 },
1029 #endif
1030 #ifdef CONFIG_IA64
1031 {
1032 .procname = "unaligned-dump-stack",
1033 .data = &unaligned_dump_stack,
1034 .maxlen = sizeof (int),
1035 .mode = 0644,
1036 .proc_handler = proc_dointvec,
1037 },
1038 #endif
1039 #ifdef CONFIG_DETECT_HUNG_TASK
1040 {
1041 .procname = "hung_task_panic",
1042 .data = &sysctl_hung_task_panic,
1043 .maxlen = sizeof(int),
1044 .mode = 0644,
1045 .proc_handler = proc_dointvec_minmax,
1046 .extra1 = &zero,
1047 .extra2 = &one,
1048 },
1049 {
1050 .procname = "hung_task_check_count",
1051 .data = &sysctl_hung_task_check_count,
1052 .maxlen = sizeof(int),
1053 .mode = 0644,
1054 .proc_handler = proc_dointvec_minmax,
1055 .extra1 = &zero,
1056 },
1057 {
1058 .procname = "hung_task_timeout_secs",
1059 .data = &sysctl_hung_task_timeout_secs,
1060 .maxlen = sizeof(unsigned long),
1061 .mode = 0644,
1062 .proc_handler = proc_dohung_task_timeout_secs,
1063 .extra2 = &hung_task_timeout_max,
1064 },
1065 {
1066 .procname = "hung_task_warnings",
1067 .data = &sysctl_hung_task_warnings,
1068 .maxlen = sizeof(int),
1069 .mode = 0644,
1070 .proc_handler = proc_dointvec_minmax,
1071 .extra1 = &neg_one,
1072 },
1073 #endif
1074 #ifdef CONFIG_RT_MUTEXES
1075 {
1076 .procname = "max_lock_depth",
1077 .data = &max_lock_depth,
1078 .maxlen = sizeof(int),
1079 .mode = 0644,
1080 .proc_handler = proc_dointvec,
1081 },
1082 #endif
1083 {
1084 .procname = "poweroff_cmd",
1085 .data = &poweroff_cmd,
1086 .maxlen = POWEROFF_CMD_PATH_LEN,
1087 .mode = 0644,
1088 .proc_handler = proc_dostring,
1089 },
1090 #ifdef CONFIG_KEYS
1091 {
1092 .procname = "keys",
1093 .mode = 0555,
1094 .child = key_sysctls,
1095 },
1096 #endif
1097 #ifdef CONFIG_PERF_EVENTS
1098 /*
1099 * User-space scripts rely on the existence of this file
1100 * as a feature check for perf_events being enabled.
1101 *
1102 * So it's an ABI, do not remove!
1103 */
1104 {
1105 .procname = "perf_event_paranoid",
1106 .data = &sysctl_perf_event_paranoid,
1107 .maxlen = sizeof(sysctl_perf_event_paranoid),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec,
1110 },
1111 {
1112 .procname = "perf_event_mlock_kb",
1113 .data = &sysctl_perf_event_mlock,
1114 .maxlen = sizeof(sysctl_perf_event_mlock),
1115 .mode = 0644,
1116 .proc_handler = proc_dointvec,
1117 },
1118 {
1119 .procname = "perf_event_max_sample_rate",
1120 .data = &sysctl_perf_event_sample_rate,
1121 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1122 .mode = 0644,
1123 .proc_handler = perf_proc_update_handler,
1124 .extra1 = &one,
1125 },
1126 {
1127 .procname = "perf_cpu_time_max_percent",
1128 .data = &sysctl_perf_cpu_time_max_percent,
1129 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1130 .mode = 0644,
1131 .proc_handler = perf_cpu_time_max_percent_handler,
1132 .extra1 = &zero,
1133 .extra2 = &one_hundred,
1134 },
1135 {
1136 .procname = "perf_event_max_stack",
1137 .data = &sysctl_perf_event_max_stack,
1138 .maxlen = sizeof(sysctl_perf_event_max_stack),
1139 .mode = 0644,
1140 .proc_handler = perf_event_max_stack_handler,
1141 .extra1 = &zero,
1142 .extra2 = &six_hundred_forty_kb,
1143 },
1144 {
1145 .procname = "perf_event_max_contexts_per_stack",
1146 .data = &sysctl_perf_event_max_contexts_per_stack,
1147 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1148 .mode = 0644,
1149 .proc_handler = perf_event_max_stack_handler,
1150 .extra1 = &zero,
1151 .extra2 = &one_thousand,
1152 },
1153 #endif
1154 #ifdef CONFIG_KMEMCHECK
1155 {
1156 .procname = "kmemcheck",
1157 .data = &kmemcheck_enabled,
1158 .maxlen = sizeof(int),
1159 .mode = 0644,
1160 .proc_handler = proc_dointvec,
1161 },
1162 #endif
1163 {
1164 .procname = "panic_on_warn",
1165 .data = &panic_on_warn,
1166 .maxlen = sizeof(int),
1167 .mode = 0644,
1168 .proc_handler = proc_dointvec_minmax,
1169 .extra1 = &zero,
1170 .extra2 = &one,
1171 },
1172 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1173 {
1174 .procname = "timer_migration",
1175 .data = &sysctl_timer_migration,
1176 .maxlen = sizeof(unsigned int),
1177 .mode = 0644,
1178 .proc_handler = timer_migration_handler,
1179 .extra1 = &zero,
1180 .extra2 = &one,
1181 },
1182 #endif
1183 #ifdef CONFIG_BPF_SYSCALL
1184 {
1185 .procname = "unprivileged_bpf_disabled",
1186 .data = &sysctl_unprivileged_bpf_disabled,
1187 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1188 .mode = 0644,
1189 /* only handle a transition from default "0" to "1" */
1190 .proc_handler = proc_dointvec_minmax,
1191 .extra1 = &one,
1192 .extra2 = &one,
1193 },
1194 #endif
1195 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1196 {
1197 .procname = "panic_on_rcu_stall",
1198 .data = &sysctl_panic_on_rcu_stall,
1199 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1200 .mode = 0644,
1201 .proc_handler = proc_dointvec_minmax,
1202 .extra1 = &zero,
1203 .extra2 = &one,
1204 },
1205 #endif
1206 { }
1207 };
1208
1209 static struct ctl_table vm_table[] = {
1210 {
1211 .procname = "overcommit_memory",
1212 .data = &sysctl_overcommit_memory,
1213 .maxlen = sizeof(sysctl_overcommit_memory),
1214 .mode = 0644,
1215 .proc_handler = proc_dointvec_minmax,
1216 .extra1 = &zero,
1217 .extra2 = &two,
1218 },
1219 {
1220 .procname = "panic_on_oom",
1221 .data = &sysctl_panic_on_oom,
1222 .maxlen = sizeof(sysctl_panic_on_oom),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec_minmax,
1225 .extra1 = &zero,
1226 .extra2 = &two,
1227 },
1228 {
1229 .procname = "oom_kill_allocating_task",
1230 .data = &sysctl_oom_kill_allocating_task,
1231 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1232 .mode = 0644,
1233 .proc_handler = proc_dointvec,
1234 },
1235 {
1236 .procname = "oom_dump_tasks",
1237 .data = &sysctl_oom_dump_tasks,
1238 .maxlen = sizeof(sysctl_oom_dump_tasks),
1239 .mode = 0644,
1240 .proc_handler = proc_dointvec,
1241 },
1242 {
1243 .procname = "overcommit_ratio",
1244 .data = &sysctl_overcommit_ratio,
1245 .maxlen = sizeof(sysctl_overcommit_ratio),
1246 .mode = 0644,
1247 .proc_handler = overcommit_ratio_handler,
1248 },
1249 {
1250 .procname = "overcommit_kbytes",
1251 .data = &sysctl_overcommit_kbytes,
1252 .maxlen = sizeof(sysctl_overcommit_kbytes),
1253 .mode = 0644,
1254 .proc_handler = overcommit_kbytes_handler,
1255 },
1256 {
1257 .procname = "page-cluster",
1258 .data = &page_cluster,
1259 .maxlen = sizeof(int),
1260 .mode = 0644,
1261 .proc_handler = proc_dointvec_minmax,
1262 .extra1 = &zero,
1263 },
1264 {
1265 .procname = "dirty_background_ratio",
1266 .data = &dirty_background_ratio,
1267 .maxlen = sizeof(dirty_background_ratio),
1268 .mode = 0644,
1269 .proc_handler = dirty_background_ratio_handler,
1270 .extra1 = &zero,
1271 .extra2 = &one_hundred,
1272 },
1273 {
1274 .procname = "dirty_background_bytes",
1275 .data = &dirty_background_bytes,
1276 .maxlen = sizeof(dirty_background_bytes),
1277 .mode = 0644,
1278 .proc_handler = dirty_background_bytes_handler,
1279 .extra1 = &one_ul,
1280 },
1281 {
1282 .procname = "dirty_ratio",
1283 .data = &vm_dirty_ratio,
1284 .maxlen = sizeof(vm_dirty_ratio),
1285 .mode = 0644,
1286 .proc_handler = dirty_ratio_handler,
1287 .extra1 = &zero,
1288 .extra2 = &one_hundred,
1289 },
1290 {
1291 .procname = "dirty_bytes",
1292 .data = &vm_dirty_bytes,
1293 .maxlen = sizeof(vm_dirty_bytes),
1294 .mode = 0644,
1295 .proc_handler = dirty_bytes_handler,
1296 .extra1 = &dirty_bytes_min,
1297 },
1298 {
1299 .procname = "dirty_writeback_centisecs",
1300 .data = &dirty_writeback_interval,
1301 .maxlen = sizeof(dirty_writeback_interval),
1302 .mode = 0644,
1303 .proc_handler = dirty_writeback_centisecs_handler,
1304 },
1305 {
1306 .procname = "dirty_expire_centisecs",
1307 .data = &dirty_expire_interval,
1308 .maxlen = sizeof(dirty_expire_interval),
1309 .mode = 0644,
1310 .proc_handler = proc_dointvec_minmax,
1311 .extra1 = &zero,
1312 },
1313 {
1314 .procname = "dirtytime_expire_seconds",
1315 .data = &dirtytime_expire_interval,
1316 .maxlen = sizeof(dirty_expire_interval),
1317 .mode = 0644,
1318 .proc_handler = dirtytime_interval_handler,
1319 .extra1 = &zero,
1320 },
1321 {
1322 .procname = "nr_pdflush_threads",
1323 .mode = 0444 /* read-only */,
1324 .proc_handler = pdflush_proc_obsolete,
1325 },
1326 {
1327 .procname = "swappiness",
1328 .data = &vm_swappiness,
1329 .maxlen = sizeof(vm_swappiness),
1330 .mode = 0644,
1331 .proc_handler = proc_dointvec_minmax,
1332 .extra1 = &zero,
1333 .extra2 = &one_hundred,
1334 },
1335 #ifdef CONFIG_HUGETLB_PAGE
1336 {
1337 .procname = "nr_hugepages",
1338 .data = NULL,
1339 .maxlen = sizeof(unsigned long),
1340 .mode = 0644,
1341 .proc_handler = hugetlb_sysctl_handler,
1342 },
1343 #ifdef CONFIG_NUMA
1344 {
1345 .procname = "nr_hugepages_mempolicy",
1346 .data = NULL,
1347 .maxlen = sizeof(unsigned long),
1348 .mode = 0644,
1349 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1350 },
1351 #endif
1352 {
1353 .procname = "hugetlb_shm_group",
1354 .data = &sysctl_hugetlb_shm_group,
1355 .maxlen = sizeof(gid_t),
1356 .mode = 0644,
1357 .proc_handler = proc_dointvec,
1358 },
1359 {
1360 .procname = "hugepages_treat_as_movable",
1361 .data = &hugepages_treat_as_movable,
1362 .maxlen = sizeof(int),
1363 .mode = 0644,
1364 .proc_handler = proc_dointvec,
1365 },
1366 {
1367 .procname = "nr_overcommit_hugepages",
1368 .data = NULL,
1369 .maxlen = sizeof(unsigned long),
1370 .mode = 0644,
1371 .proc_handler = hugetlb_overcommit_handler,
1372 },
1373 #endif
1374 {
1375 .procname = "lowmem_reserve_ratio",
1376 .data = &sysctl_lowmem_reserve_ratio,
1377 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1378 .mode = 0644,
1379 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1380 },
1381 {
1382 .procname = "drop_caches",
1383 .data = &sysctl_drop_caches,
1384 .maxlen = sizeof(int),
1385 .mode = 0644,
1386 .proc_handler = drop_caches_sysctl_handler,
1387 .extra1 = &one,
1388 .extra2 = &four,
1389 },
1390 #ifdef CONFIG_COMPACTION
1391 {
1392 .procname = "compact_memory",
1393 .data = &sysctl_compact_memory,
1394 .maxlen = sizeof(int),
1395 .mode = 0200,
1396 .proc_handler = sysctl_compaction_handler,
1397 },
1398 {
1399 .procname = "extfrag_threshold",
1400 .data = &sysctl_extfrag_threshold,
1401 .maxlen = sizeof(int),
1402 .mode = 0644,
1403 .proc_handler = sysctl_extfrag_handler,
1404 .extra1 = &min_extfrag_threshold,
1405 .extra2 = &max_extfrag_threshold,
1406 },
1407 {
1408 .procname = "compact_unevictable_allowed",
1409 .data = &sysctl_compact_unevictable_allowed,
1410 .maxlen = sizeof(int),
1411 .mode = 0644,
1412 .proc_handler = proc_dointvec,
1413 .extra1 = &zero,
1414 .extra2 = &one,
1415 },
1416
1417 #endif /* CONFIG_COMPACTION */
1418 {
1419 .procname = "min_free_kbytes",
1420 .data = &min_free_kbytes,
1421 .maxlen = sizeof(min_free_kbytes),
1422 .mode = 0644,
1423 .proc_handler = min_free_kbytes_sysctl_handler,
1424 .extra1 = &zero,
1425 },
1426 {
1427 .procname = "watermark_scale_factor",
1428 .data = &watermark_scale_factor,
1429 .maxlen = sizeof(watermark_scale_factor),
1430 .mode = 0644,
1431 .proc_handler = watermark_scale_factor_sysctl_handler,
1432 .extra1 = &one,
1433 .extra2 = &one_thousand,
1434 },
1435 {
1436 .procname = "percpu_pagelist_fraction",
1437 .data = &percpu_pagelist_fraction,
1438 .maxlen = sizeof(percpu_pagelist_fraction),
1439 .mode = 0644,
1440 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1441 .extra1 = &zero,
1442 },
1443 #ifdef CONFIG_MMU
1444 {
1445 .procname = "max_map_count",
1446 .data = &sysctl_max_map_count,
1447 .maxlen = sizeof(sysctl_max_map_count),
1448 .mode = 0644,
1449 .proc_handler = proc_dointvec_minmax,
1450 .extra1 = &zero,
1451 },
1452 #else
1453 {
1454 .procname = "nr_trim_pages",
1455 .data = &sysctl_nr_trim_pages,
1456 .maxlen = sizeof(sysctl_nr_trim_pages),
1457 .mode = 0644,
1458 .proc_handler = proc_dointvec_minmax,
1459 .extra1 = &zero,
1460 },
1461 #endif
1462 {
1463 .procname = "laptop_mode",
1464 .data = &laptop_mode,
1465 .maxlen = sizeof(laptop_mode),
1466 .mode = 0644,
1467 .proc_handler = proc_dointvec_jiffies,
1468 },
1469 {
1470 .procname = "block_dump",
1471 .data = &block_dump,
1472 .maxlen = sizeof(block_dump),
1473 .mode = 0644,
1474 .proc_handler = proc_dointvec,
1475 .extra1 = &zero,
1476 },
1477 {
1478 .procname = "vfs_cache_pressure",
1479 .data = &sysctl_vfs_cache_pressure,
1480 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1481 .mode = 0644,
1482 .proc_handler = proc_dointvec,
1483 .extra1 = &zero,
1484 },
1485 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1486 {
1487 .procname = "legacy_va_layout",
1488 .data = &sysctl_legacy_va_layout,
1489 .maxlen = sizeof(sysctl_legacy_va_layout),
1490 .mode = 0644,
1491 .proc_handler = proc_dointvec,
1492 .extra1 = &zero,
1493 },
1494 #endif
1495 #ifdef CONFIG_NUMA
1496 {
1497 .procname = "zone_reclaim_mode",
1498 .data = &node_reclaim_mode,
1499 .maxlen = sizeof(node_reclaim_mode),
1500 .mode = 0644,
1501 .proc_handler = proc_dointvec,
1502 .extra1 = &zero,
1503 },
1504 {
1505 .procname = "min_unmapped_ratio",
1506 .data = &sysctl_min_unmapped_ratio,
1507 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1508 .mode = 0644,
1509 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1510 .extra1 = &zero,
1511 .extra2 = &one_hundred,
1512 },
1513 {
1514 .procname = "min_slab_ratio",
1515 .data = &sysctl_min_slab_ratio,
1516 .maxlen = sizeof(sysctl_min_slab_ratio),
1517 .mode = 0644,
1518 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1519 .extra1 = &zero,
1520 .extra2 = &one_hundred,
1521 },
1522 #endif
1523 #ifdef CONFIG_SMP
1524 {
1525 .procname = "stat_interval",
1526 .data = &sysctl_stat_interval,
1527 .maxlen = sizeof(sysctl_stat_interval),
1528 .mode = 0644,
1529 .proc_handler = proc_dointvec_jiffies,
1530 },
1531 {
1532 .procname = "stat_refresh",
1533 .data = NULL,
1534 .maxlen = 0,
1535 .mode = 0600,
1536 .proc_handler = vmstat_refresh,
1537 },
1538 #endif
1539 #ifdef CONFIG_MMU
1540 {
1541 .procname = "mmap_min_addr",
1542 .data = &dac_mmap_min_addr,
1543 .maxlen = sizeof(unsigned long),
1544 .mode = 0644,
1545 .proc_handler = mmap_min_addr_handler,
1546 },
1547 #endif
1548 #ifdef CONFIG_NUMA
1549 {
1550 .procname = "numa_zonelist_order",
1551 .data = &numa_zonelist_order,
1552 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1553 .mode = 0644,
1554 .proc_handler = numa_zonelist_order_handler,
1555 },
1556 #endif
1557 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1558 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1559 {
1560 .procname = "vdso_enabled",
1561 #ifdef CONFIG_X86_32
1562 .data = &vdso32_enabled,
1563 .maxlen = sizeof(vdso32_enabled),
1564 #else
1565 .data = &vdso_enabled,
1566 .maxlen = sizeof(vdso_enabled),
1567 #endif
1568 .mode = 0644,
1569 .proc_handler = proc_dointvec,
1570 .extra1 = &zero,
1571 },
1572 #endif
1573 #ifdef CONFIG_HIGHMEM
1574 {
1575 .procname = "highmem_is_dirtyable",
1576 .data = &vm_highmem_is_dirtyable,
1577 .maxlen = sizeof(vm_highmem_is_dirtyable),
1578 .mode = 0644,
1579 .proc_handler = proc_dointvec_minmax,
1580 .extra1 = &zero,
1581 .extra2 = &one,
1582 },
1583 #endif
1584 #ifdef CONFIG_MEMORY_FAILURE
1585 {
1586 .procname = "memory_failure_early_kill",
1587 .data = &sysctl_memory_failure_early_kill,
1588 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1589 .mode = 0644,
1590 .proc_handler = proc_dointvec_minmax,
1591 .extra1 = &zero,
1592 .extra2 = &one,
1593 },
1594 {
1595 .procname = "memory_failure_recovery",
1596 .data = &sysctl_memory_failure_recovery,
1597 .maxlen = sizeof(sysctl_memory_failure_recovery),
1598 .mode = 0644,
1599 .proc_handler = proc_dointvec_minmax,
1600 .extra1 = &zero,
1601 .extra2 = &one,
1602 },
1603 #endif
1604 {
1605 .procname = "user_reserve_kbytes",
1606 .data = &sysctl_user_reserve_kbytes,
1607 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1608 .mode = 0644,
1609 .proc_handler = proc_doulongvec_minmax,
1610 },
1611 {
1612 .procname = "admin_reserve_kbytes",
1613 .data = &sysctl_admin_reserve_kbytes,
1614 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1615 .mode = 0644,
1616 .proc_handler = proc_doulongvec_minmax,
1617 },
1618 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1619 {
1620 .procname = "mmap_rnd_bits",
1621 .data = &mmap_rnd_bits,
1622 .maxlen = sizeof(mmap_rnd_bits),
1623 .mode = 0600,
1624 .proc_handler = proc_dointvec_minmax,
1625 .extra1 = (void *)&mmap_rnd_bits_min,
1626 .extra2 = (void *)&mmap_rnd_bits_max,
1627 },
1628 #endif
1629 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1630 {
1631 .procname = "mmap_rnd_compat_bits",
1632 .data = &mmap_rnd_compat_bits,
1633 .maxlen = sizeof(mmap_rnd_compat_bits),
1634 .mode = 0600,
1635 .proc_handler = proc_dointvec_minmax,
1636 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1637 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1638 },
1639 #endif
1640 { }
1641 };
1642
1643 static struct ctl_table fs_table[] = {
1644 {
1645 .procname = "inode-nr",
1646 .data = &inodes_stat,
1647 .maxlen = 2*sizeof(long),
1648 .mode = 0444,
1649 .proc_handler = proc_nr_inodes,
1650 },
1651 {
1652 .procname = "inode-state",
1653 .data = &inodes_stat,
1654 .maxlen = 7*sizeof(long),
1655 .mode = 0444,
1656 .proc_handler = proc_nr_inodes,
1657 },
1658 {
1659 .procname = "file-nr",
1660 .data = &files_stat,
1661 .maxlen = sizeof(files_stat),
1662 .mode = 0444,
1663 .proc_handler = proc_nr_files,
1664 },
1665 {
1666 .procname = "file-max",
1667 .data = &files_stat.max_files,
1668 .maxlen = sizeof(files_stat.max_files),
1669 .mode = 0644,
1670 .proc_handler = proc_doulongvec_minmax,
1671 },
1672 {
1673 .procname = "nr_open",
1674 .data = &sysctl_nr_open,
1675 .maxlen = sizeof(unsigned int),
1676 .mode = 0644,
1677 .proc_handler = proc_dointvec_minmax,
1678 .extra1 = &sysctl_nr_open_min,
1679 .extra2 = &sysctl_nr_open_max,
1680 },
1681 {
1682 .procname = "dentry-state",
1683 .data = &dentry_stat,
1684 .maxlen = 6*sizeof(long),
1685 .mode = 0444,
1686 .proc_handler = proc_nr_dentry,
1687 },
1688 {
1689 .procname = "overflowuid",
1690 .data = &fs_overflowuid,
1691 .maxlen = sizeof(int),
1692 .mode = 0644,
1693 .proc_handler = proc_dointvec_minmax,
1694 .extra1 = &minolduid,
1695 .extra2 = &maxolduid,
1696 },
1697 {
1698 .procname = "overflowgid",
1699 .data = &fs_overflowgid,
1700 .maxlen = sizeof(int),
1701 .mode = 0644,
1702 .proc_handler = proc_dointvec_minmax,
1703 .extra1 = &minolduid,
1704 .extra2 = &maxolduid,
1705 },
1706 #ifdef CONFIG_FILE_LOCKING
1707 {
1708 .procname = "leases-enable",
1709 .data = &leases_enable,
1710 .maxlen = sizeof(int),
1711 .mode = 0644,
1712 .proc_handler = proc_dointvec,
1713 },
1714 #endif
1715 #ifdef CONFIG_DNOTIFY
1716 {
1717 .procname = "dir-notify-enable",
1718 .data = &dir_notify_enable,
1719 .maxlen = sizeof(int),
1720 .mode = 0644,
1721 .proc_handler = proc_dointvec,
1722 },
1723 #endif
1724 #ifdef CONFIG_MMU
1725 #ifdef CONFIG_FILE_LOCKING
1726 {
1727 .procname = "lease-break-time",
1728 .data = &lease_break_time,
1729 .maxlen = sizeof(int),
1730 .mode = 0644,
1731 .proc_handler = proc_dointvec,
1732 },
1733 #endif
1734 #ifdef CONFIG_AIO
1735 {
1736 .procname = "aio-nr",
1737 .data = &aio_nr,
1738 .maxlen = sizeof(aio_nr),
1739 .mode = 0444,
1740 .proc_handler = proc_doulongvec_minmax,
1741 },
1742 {
1743 .procname = "aio-max-nr",
1744 .data = &aio_max_nr,
1745 .maxlen = sizeof(aio_max_nr),
1746 .mode = 0644,
1747 .proc_handler = proc_doulongvec_minmax,
1748 },
1749 #endif /* CONFIG_AIO */
1750 #ifdef CONFIG_INOTIFY_USER
1751 {
1752 .procname = "inotify",
1753 .mode = 0555,
1754 .child = inotify_table,
1755 },
1756 #endif
1757 #ifdef CONFIG_EPOLL
1758 {
1759 .procname = "epoll",
1760 .mode = 0555,
1761 .child = epoll_table,
1762 },
1763 #endif
1764 #endif
1765 {
1766 .procname = "protected_symlinks",
1767 .data = &sysctl_protected_symlinks,
1768 .maxlen = sizeof(int),
1769 .mode = 0600,
1770 .proc_handler = proc_dointvec_minmax,
1771 .extra1 = &zero,
1772 .extra2 = &one,
1773 },
1774 {
1775 .procname = "protected_hardlinks",
1776 .data = &sysctl_protected_hardlinks,
1777 .maxlen = sizeof(int),
1778 .mode = 0600,
1779 .proc_handler = proc_dointvec_minmax,
1780 .extra1 = &zero,
1781 .extra2 = &one,
1782 },
1783 {
1784 .procname = "suid_dumpable",
1785 .data = &suid_dumpable,
1786 .maxlen = sizeof(int),
1787 .mode = 0644,
1788 .proc_handler = proc_dointvec_minmax_coredump,
1789 .extra1 = &zero,
1790 .extra2 = &two,
1791 },
1792 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1793 {
1794 .procname = "binfmt_misc",
1795 .mode = 0555,
1796 .child = sysctl_mount_point,
1797 },
1798 #endif
1799 {
1800 .procname = "pipe-max-size",
1801 .data = &pipe_max_size,
1802 .maxlen = sizeof(int),
1803 .mode = 0644,
1804 .proc_handler = &pipe_proc_fn,
1805 .extra1 = &pipe_min_size,
1806 },
1807 {
1808 .procname = "pipe-user-pages-hard",
1809 .data = &pipe_user_pages_hard,
1810 .maxlen = sizeof(pipe_user_pages_hard),
1811 .mode = 0644,
1812 .proc_handler = proc_doulongvec_minmax,
1813 },
1814 {
1815 .procname = "pipe-user-pages-soft",
1816 .data = &pipe_user_pages_soft,
1817 .maxlen = sizeof(pipe_user_pages_soft),
1818 .mode = 0644,
1819 .proc_handler = proc_doulongvec_minmax,
1820 },
1821 {
1822 .procname = "mount-max",
1823 .data = &sysctl_mount_max,
1824 .maxlen = sizeof(unsigned int),
1825 .mode = 0644,
1826 .proc_handler = proc_dointvec_minmax,
1827 .extra1 = &one,
1828 },
1829 { }
1830 };
1831
1832 static struct ctl_table debug_table[] = {
1833 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1834 {
1835 .procname = "exception-trace",
1836 .data = &show_unhandled_signals,
1837 .maxlen = sizeof(int),
1838 .mode = 0644,
1839 .proc_handler = proc_dointvec
1840 },
1841 #endif
1842 #if defined(CONFIG_OPTPROBES)
1843 {
1844 .procname = "kprobes-optimization",
1845 .data = &sysctl_kprobes_optimization,
1846 .maxlen = sizeof(int),
1847 .mode = 0644,
1848 .proc_handler = proc_kprobes_optimization_handler,
1849 .extra1 = &zero,
1850 .extra2 = &one,
1851 },
1852 #endif
1853 { }
1854 };
1855
1856 static struct ctl_table dev_table[] = {
1857 { }
1858 };
1859
1860 int __init sysctl_init(void)
1861 {
1862 struct ctl_table_header *hdr;
1863
1864 hdr = register_sysctl_table(sysctl_base_table);
1865 kmemleak_not_leak(hdr);
1866 return 0;
1867 }
1868
1869 #endif /* CONFIG_SYSCTL */
1870
1871 /*
1872 * /proc/sys support
1873 */
1874
1875 #ifdef CONFIG_PROC_SYSCTL
1876
1877 static int _proc_do_string(char *data, int maxlen, int write,
1878 char __user *buffer,
1879 size_t *lenp, loff_t *ppos)
1880 {
1881 size_t len;
1882 char __user *p;
1883 char c;
1884
1885 if (!data || !maxlen || !*lenp) {
1886 *lenp = 0;
1887 return 0;
1888 }
1889
1890 if (write) {
1891 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1892 /* Only continue writes not past the end of buffer. */
1893 len = strlen(data);
1894 if (len > maxlen - 1)
1895 len = maxlen - 1;
1896
1897 if (*ppos > len)
1898 return 0;
1899 len = *ppos;
1900 } else {
1901 /* Start writing from beginning of buffer. */
1902 len = 0;
1903 }
1904
1905 *ppos += *lenp;
1906 p = buffer;
1907 while ((p - buffer) < *lenp && len < maxlen - 1) {
1908 if (get_user(c, p++))
1909 return -EFAULT;
1910 if (c == 0 || c == '\n')
1911 break;
1912 data[len++] = c;
1913 }
1914 data[len] = 0;
1915 } else {
1916 len = strlen(data);
1917 if (len > maxlen)
1918 len = maxlen;
1919
1920 if (*ppos > len) {
1921 *lenp = 0;
1922 return 0;
1923 }
1924
1925 data += *ppos;
1926 len -= *ppos;
1927
1928 if (len > *lenp)
1929 len = *lenp;
1930 if (len)
1931 if (copy_to_user(buffer, data, len))
1932 return -EFAULT;
1933 if (len < *lenp) {
1934 if (put_user('\n', buffer + len))
1935 return -EFAULT;
1936 len++;
1937 }
1938 *lenp = len;
1939 *ppos += len;
1940 }
1941 return 0;
1942 }
1943
1944 static void warn_sysctl_write(struct ctl_table *table)
1945 {
1946 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1947 "This will not be supported in the future. To silence this\n"
1948 "warning, set kernel.sysctl_writes_strict = -1\n",
1949 current->comm, table->procname);
1950 }
1951
1952 /**
1953 * proc_dostring - read a string sysctl
1954 * @table: the sysctl table
1955 * @write: %TRUE if this is a write to the sysctl file
1956 * @buffer: the user buffer
1957 * @lenp: the size of the user buffer
1958 * @ppos: file position
1959 *
1960 * Reads/writes a string from/to the user buffer. If the kernel
1961 * buffer provided is not large enough to hold the string, the
1962 * string is truncated. The copied string is %NULL-terminated.
1963 * If the string is being read by the user process, it is copied
1964 * and a newline '\n' is added. It is truncated if the buffer is
1965 * not large enough.
1966 *
1967 * Returns 0 on success.
1968 */
1969 int proc_dostring(struct ctl_table *table, int write,
1970 void __user *buffer, size_t *lenp, loff_t *ppos)
1971 {
1972 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1973 warn_sysctl_write(table);
1974
1975 return _proc_do_string((char *)(table->data), table->maxlen, write,
1976 (char __user *)buffer, lenp, ppos);
1977 }
1978
1979 static size_t proc_skip_spaces(char **buf)
1980 {
1981 size_t ret;
1982 char *tmp = skip_spaces(*buf);
1983 ret = tmp - *buf;
1984 *buf = tmp;
1985 return ret;
1986 }
1987
1988 static void proc_skip_char(char **buf, size_t *size, const char v)
1989 {
1990 while (*size) {
1991 if (**buf != v)
1992 break;
1993 (*size)--;
1994 (*buf)++;
1995 }
1996 }
1997
1998 #define TMPBUFLEN 22
1999 /**
2000 * proc_get_long - reads an ASCII formatted integer from a user buffer
2001 *
2002 * @buf: a kernel buffer
2003 * @size: size of the kernel buffer
2004 * @val: this is where the number will be stored
2005 * @neg: set to %TRUE if number is negative
2006 * @perm_tr: a vector which contains the allowed trailers
2007 * @perm_tr_len: size of the perm_tr vector
2008 * @tr: pointer to store the trailer character
2009 *
2010 * In case of success %0 is returned and @buf and @size are updated with
2011 * the amount of bytes read. If @tr is non-NULL and a trailing
2012 * character exists (size is non-zero after returning from this
2013 * function), @tr is updated with the trailing character.
2014 */
2015 static int proc_get_long(char **buf, size_t *size,
2016 unsigned long *val, bool *neg,
2017 const char *perm_tr, unsigned perm_tr_len, char *tr)
2018 {
2019 int len;
2020 char *p, tmp[TMPBUFLEN];
2021
2022 if (!*size)
2023 return -EINVAL;
2024
2025 len = *size;
2026 if (len > TMPBUFLEN - 1)
2027 len = TMPBUFLEN - 1;
2028
2029 memcpy(tmp, *buf, len);
2030
2031 tmp[len] = 0;
2032 p = tmp;
2033 if (*p == '-' && *size > 1) {
2034 *neg = true;
2035 p++;
2036 } else
2037 *neg = false;
2038 if (!isdigit(*p))
2039 return -EINVAL;
2040
2041 *val = simple_strtoul(p, &p, 0);
2042
2043 len = p - tmp;
2044
2045 /* We don't know if the next char is whitespace thus we may accept
2046 * invalid integers (e.g. 1234...a) or two integers instead of one
2047 * (e.g. 123...1). So lets not allow such large numbers. */
2048 if (len == TMPBUFLEN - 1)
2049 return -EINVAL;
2050
2051 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2052 return -EINVAL;
2053
2054 if (tr && (len < *size))
2055 *tr = *p;
2056
2057 *buf += len;
2058 *size -= len;
2059
2060 return 0;
2061 }
2062
2063 /**
2064 * proc_put_long - converts an integer to a decimal ASCII formatted string
2065 *
2066 * @buf: the user buffer
2067 * @size: the size of the user buffer
2068 * @val: the integer to be converted
2069 * @neg: sign of the number, %TRUE for negative
2070 *
2071 * In case of success %0 is returned and @buf and @size are updated with
2072 * the amount of bytes written.
2073 */
2074 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2075 bool neg)
2076 {
2077 int len;
2078 char tmp[TMPBUFLEN], *p = tmp;
2079
2080 sprintf(p, "%s%lu", neg ? "-" : "", val);
2081 len = strlen(tmp);
2082 if (len > *size)
2083 len = *size;
2084 if (copy_to_user(*buf, tmp, len))
2085 return -EFAULT;
2086 *size -= len;
2087 *buf += len;
2088 return 0;
2089 }
2090 #undef TMPBUFLEN
2091
2092 static int proc_put_char(void __user **buf, size_t *size, char c)
2093 {
2094 if (*size) {
2095 char __user **buffer = (char __user **)buf;
2096 if (put_user(c, *buffer))
2097 return -EFAULT;
2098 (*size)--, (*buffer)++;
2099 *buf = *buffer;
2100 }
2101 return 0;
2102 }
2103
2104 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2105 int *valp,
2106 int write, void *data)
2107 {
2108 if (write) {
2109 if (*negp) {
2110 if (*lvalp > (unsigned long) INT_MAX + 1)
2111 return -EINVAL;
2112 *valp = -*lvalp;
2113 } else {
2114 if (*lvalp > (unsigned long) INT_MAX)
2115 return -EINVAL;
2116 *valp = *lvalp;
2117 }
2118 } else {
2119 int val = *valp;
2120 if (val < 0) {
2121 *negp = true;
2122 *lvalp = -(unsigned long)val;
2123 } else {
2124 *negp = false;
2125 *lvalp = (unsigned long)val;
2126 }
2127 }
2128 return 0;
2129 }
2130
2131 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2132 int *valp,
2133 int write, void *data)
2134 {
2135 if (write) {
2136 if (*negp)
2137 return -EINVAL;
2138 if (*lvalp > UINT_MAX)
2139 return -EINVAL;
2140 *valp = *lvalp;
2141 } else {
2142 unsigned int val = *valp;
2143 *negp = false;
2144 *lvalp = (unsigned long)val;
2145 }
2146 return 0;
2147 }
2148
2149 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2150
2151 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2152 int write, void __user *buffer,
2153 size_t *lenp, loff_t *ppos,
2154 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2155 int write, void *data),
2156 void *data)
2157 {
2158 int *i, vleft, first = 1, err = 0;
2159 size_t left;
2160 char *kbuf = NULL, *p;
2161
2162 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2163 *lenp = 0;
2164 return 0;
2165 }
2166
2167 i = (int *) tbl_data;
2168 vleft = table->maxlen / sizeof(*i);
2169 left = *lenp;
2170
2171 if (!conv)
2172 conv = do_proc_dointvec_conv;
2173
2174 if (write) {
2175 if (*ppos) {
2176 switch (sysctl_writes_strict) {
2177 case SYSCTL_WRITES_STRICT:
2178 goto out;
2179 case SYSCTL_WRITES_WARN:
2180 warn_sysctl_write(table);
2181 break;
2182 default:
2183 break;
2184 }
2185 }
2186
2187 if (left > PAGE_SIZE - 1)
2188 left = PAGE_SIZE - 1;
2189 p = kbuf = memdup_user_nul(buffer, left);
2190 if (IS_ERR(kbuf))
2191 return PTR_ERR(kbuf);
2192 }
2193
2194 for (; left && vleft--; i++, first=0) {
2195 unsigned long lval;
2196 bool neg;
2197
2198 if (write) {
2199 left -= proc_skip_spaces(&p);
2200
2201 if (!left)
2202 break;
2203 err = proc_get_long(&p, &left, &lval, &neg,
2204 proc_wspace_sep,
2205 sizeof(proc_wspace_sep), NULL);
2206 if (err)
2207 break;
2208 if (conv(&neg, &lval, i, 1, data)) {
2209 err = -EINVAL;
2210 break;
2211 }
2212 } else {
2213 if (conv(&neg, &lval, i, 0, data)) {
2214 err = -EINVAL;
2215 break;
2216 }
2217 if (!first)
2218 err = proc_put_char(&buffer, &left, '\t');
2219 if (err)
2220 break;
2221 err = proc_put_long(&buffer, &left, lval, neg);
2222 if (err)
2223 break;
2224 }
2225 }
2226
2227 if (!write && !first && left && !err)
2228 err = proc_put_char(&buffer, &left, '\n');
2229 if (write && !err && left)
2230 left -= proc_skip_spaces(&p);
2231 if (write) {
2232 kfree(kbuf);
2233 if (first)
2234 return err ? : -EINVAL;
2235 }
2236 *lenp -= left;
2237 out:
2238 *ppos += *lenp;
2239 return err;
2240 }
2241
2242 static int do_proc_dointvec(struct ctl_table *table, int write,
2243 void __user *buffer, size_t *lenp, loff_t *ppos,
2244 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2245 int write, void *data),
2246 void *data)
2247 {
2248 return __do_proc_dointvec(table->data, table, write,
2249 buffer, lenp, ppos, conv, data);
2250 }
2251
2252 /**
2253 * proc_dointvec - read a vector of integers
2254 * @table: the sysctl table
2255 * @write: %TRUE if this is a write to the sysctl file
2256 * @buffer: the user buffer
2257 * @lenp: the size of the user buffer
2258 * @ppos: file position
2259 *
2260 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2261 * values from/to the user buffer, treated as an ASCII string.
2262 *
2263 * Returns 0 on success.
2264 */
2265 int proc_dointvec(struct ctl_table *table, int write,
2266 void __user *buffer, size_t *lenp, loff_t *ppos)
2267 {
2268 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2269 }
2270
2271 /**
2272 * proc_douintvec - read a vector of unsigned integers
2273 * @table: the sysctl table
2274 * @write: %TRUE if this is a write to the sysctl file
2275 * @buffer: the user buffer
2276 * @lenp: the size of the user buffer
2277 * @ppos: file position
2278 *
2279 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2280 * values from/to the user buffer, treated as an ASCII string.
2281 *
2282 * Returns 0 on success.
2283 */
2284 int proc_douintvec(struct ctl_table *table, int write,
2285 void __user *buffer, size_t *lenp, loff_t *ppos)
2286 {
2287 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2288 do_proc_douintvec_conv, NULL);
2289 }
2290
2291 /*
2292 * Taint values can only be increased
2293 * This means we can safely use a temporary.
2294 */
2295 static int proc_taint(struct ctl_table *table, int write,
2296 void __user *buffer, size_t *lenp, loff_t *ppos)
2297 {
2298 struct ctl_table t;
2299 unsigned long tmptaint = get_taint();
2300 int err;
2301
2302 if (write && !capable(CAP_SYS_ADMIN))
2303 return -EPERM;
2304
2305 t = *table;
2306 t.data = &tmptaint;
2307 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2308 if (err < 0)
2309 return err;
2310
2311 if (write) {
2312 /*
2313 * Poor man's atomic or. Not worth adding a primitive
2314 * to everyone's atomic.h for this
2315 */
2316 int i;
2317 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2318 if ((tmptaint >> i) & 1)
2319 add_taint(i, LOCKDEP_STILL_OK);
2320 }
2321 }
2322
2323 return err;
2324 }
2325
2326 #ifdef CONFIG_PRINTK
2327 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2328 void __user *buffer, size_t *lenp, loff_t *ppos)
2329 {
2330 if (write && !capable(CAP_SYS_ADMIN))
2331 return -EPERM;
2332
2333 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2334 }
2335 #endif
2336
2337 struct do_proc_dointvec_minmax_conv_param {
2338 int *min;
2339 int *max;
2340 };
2341
2342 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2343 int *valp,
2344 int write, void *data)
2345 {
2346 struct do_proc_dointvec_minmax_conv_param *param = data;
2347 if (write) {
2348 int val = *negp ? -*lvalp : *lvalp;
2349 if ((param->min && *param->min > val) ||
2350 (param->max && *param->max < val))
2351 return -EINVAL;
2352 *valp = val;
2353 } else {
2354 int val = *valp;
2355 if (val < 0) {
2356 *negp = true;
2357 *lvalp = -(unsigned long)val;
2358 } else {
2359 *negp = false;
2360 *lvalp = (unsigned long)val;
2361 }
2362 }
2363 return 0;
2364 }
2365
2366 /**
2367 * proc_dointvec_minmax - read a vector of integers with min/max values
2368 * @table: the sysctl table
2369 * @write: %TRUE if this is a write to the sysctl file
2370 * @buffer: the user buffer
2371 * @lenp: the size of the user buffer
2372 * @ppos: file position
2373 *
2374 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2375 * values from/to the user buffer, treated as an ASCII string.
2376 *
2377 * This routine will ensure the values are within the range specified by
2378 * table->extra1 (min) and table->extra2 (max).
2379 *
2380 * Returns 0 on success.
2381 */
2382 int proc_dointvec_minmax(struct ctl_table *table, int write,
2383 void __user *buffer, size_t *lenp, loff_t *ppos)
2384 {
2385 struct do_proc_dointvec_minmax_conv_param param = {
2386 .min = (int *) table->extra1,
2387 .max = (int *) table->extra2,
2388 };
2389 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2390 do_proc_dointvec_minmax_conv, &param);
2391 }
2392
2393 static void validate_coredump_safety(void)
2394 {
2395 #ifdef CONFIG_COREDUMP
2396 if (suid_dumpable == SUID_DUMP_ROOT &&
2397 core_pattern[0] != '/' && core_pattern[0] != '|') {
2398 printk(KERN_WARNING
2399 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2400 "Pipe handler or fully qualified core dump path required.\n"
2401 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2402 );
2403 }
2404 #endif
2405 }
2406
2407 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2408 void __user *buffer, size_t *lenp, loff_t *ppos)
2409 {
2410 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2411 if (!error)
2412 validate_coredump_safety();
2413 return error;
2414 }
2415
2416 #ifdef CONFIG_COREDUMP
2417 static int proc_dostring_coredump(struct ctl_table *table, int write,
2418 void __user *buffer, size_t *lenp, loff_t *ppos)
2419 {
2420 int error = proc_dostring(table, write, buffer, lenp, ppos);
2421 if (!error)
2422 validate_coredump_safety();
2423 return error;
2424 }
2425 #endif
2426
2427 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2428 void __user *buffer,
2429 size_t *lenp, loff_t *ppos,
2430 unsigned long convmul,
2431 unsigned long convdiv)
2432 {
2433 unsigned long *i, *min, *max;
2434 int vleft, first = 1, err = 0;
2435 size_t left;
2436 char *kbuf = NULL, *p;
2437
2438 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2439 *lenp = 0;
2440 return 0;
2441 }
2442
2443 i = (unsigned long *) data;
2444 min = (unsigned long *) table->extra1;
2445 max = (unsigned long *) table->extra2;
2446 vleft = table->maxlen / sizeof(unsigned long);
2447 left = *lenp;
2448
2449 if (write) {
2450 if (*ppos) {
2451 switch (sysctl_writes_strict) {
2452 case SYSCTL_WRITES_STRICT:
2453 goto out;
2454 case SYSCTL_WRITES_WARN:
2455 warn_sysctl_write(table);
2456 break;
2457 default:
2458 break;
2459 }
2460 }
2461
2462 if (left > PAGE_SIZE - 1)
2463 left = PAGE_SIZE - 1;
2464 p = kbuf = memdup_user_nul(buffer, left);
2465 if (IS_ERR(kbuf))
2466 return PTR_ERR(kbuf);
2467 }
2468
2469 for (; left && vleft--; i++, first = 0) {
2470 unsigned long val;
2471
2472 if (write) {
2473 bool neg;
2474
2475 left -= proc_skip_spaces(&p);
2476
2477 err = proc_get_long(&p, &left, &val, &neg,
2478 proc_wspace_sep,
2479 sizeof(proc_wspace_sep), NULL);
2480 if (err)
2481 break;
2482 if (neg)
2483 continue;
2484 val = convmul * val / convdiv;
2485 if ((min && val < *min) || (max && val > *max))
2486 continue;
2487 *i = val;
2488 } else {
2489 val = convdiv * (*i) / convmul;
2490 if (!first) {
2491 err = proc_put_char(&buffer, &left, '\t');
2492 if (err)
2493 break;
2494 }
2495 err = proc_put_long(&buffer, &left, val, false);
2496 if (err)
2497 break;
2498 }
2499 }
2500
2501 if (!write && !first && left && !err)
2502 err = proc_put_char(&buffer, &left, '\n');
2503 if (write && !err)
2504 left -= proc_skip_spaces(&p);
2505 if (write) {
2506 kfree(kbuf);
2507 if (first)
2508 return err ? : -EINVAL;
2509 }
2510 *lenp -= left;
2511 out:
2512 *ppos += *lenp;
2513 return err;
2514 }
2515
2516 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2517 void __user *buffer,
2518 size_t *lenp, loff_t *ppos,
2519 unsigned long convmul,
2520 unsigned long convdiv)
2521 {
2522 return __do_proc_doulongvec_minmax(table->data, table, write,
2523 buffer, lenp, ppos, convmul, convdiv);
2524 }
2525
2526 /**
2527 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2528 * @table: the sysctl table
2529 * @write: %TRUE if this is a write to the sysctl file
2530 * @buffer: the user buffer
2531 * @lenp: the size of the user buffer
2532 * @ppos: file position
2533 *
2534 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2535 * values from/to the user buffer, treated as an ASCII string.
2536 *
2537 * This routine will ensure the values are within the range specified by
2538 * table->extra1 (min) and table->extra2 (max).
2539 *
2540 * Returns 0 on success.
2541 */
2542 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2543 void __user *buffer, size_t *lenp, loff_t *ppos)
2544 {
2545 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2546 }
2547
2548 /**
2549 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2550 * @table: the sysctl table
2551 * @write: %TRUE if this is a write to the sysctl file
2552 * @buffer: the user buffer
2553 * @lenp: the size of the user buffer
2554 * @ppos: file position
2555 *
2556 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2557 * values from/to the user buffer, treated as an ASCII string. The values
2558 * are treated as milliseconds, and converted to jiffies when they are stored.
2559 *
2560 * This routine will ensure the values are within the range specified by
2561 * table->extra1 (min) and table->extra2 (max).
2562 *
2563 * Returns 0 on success.
2564 */
2565 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2566 void __user *buffer,
2567 size_t *lenp, loff_t *ppos)
2568 {
2569 return do_proc_doulongvec_minmax(table, write, buffer,
2570 lenp, ppos, HZ, 1000l);
2571 }
2572
2573
2574 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2575 int *valp,
2576 int write, void *data)
2577 {
2578 if (write) {
2579 if (*lvalp > INT_MAX / HZ)
2580 return 1;
2581 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2582 } else {
2583 int val = *valp;
2584 unsigned long lval;
2585 if (val < 0) {
2586 *negp = true;
2587 lval = -(unsigned long)val;
2588 } else {
2589 *negp = false;
2590 lval = (unsigned long)val;
2591 }
2592 *lvalp = lval / HZ;
2593 }
2594 return 0;
2595 }
2596
2597 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2598 int *valp,
2599 int write, void *data)
2600 {
2601 if (write) {
2602 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2603 return 1;
2604 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2605 } else {
2606 int val = *valp;
2607 unsigned long lval;
2608 if (val < 0) {
2609 *negp = true;
2610 lval = -(unsigned long)val;
2611 } else {
2612 *negp = false;
2613 lval = (unsigned long)val;
2614 }
2615 *lvalp = jiffies_to_clock_t(lval);
2616 }
2617 return 0;
2618 }
2619
2620 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2621 int *valp,
2622 int write, void *data)
2623 {
2624 if (write) {
2625 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2626
2627 if (jif > INT_MAX)
2628 return 1;
2629 *valp = (int)jif;
2630 } else {
2631 int val = *valp;
2632 unsigned long lval;
2633 if (val < 0) {
2634 *negp = true;
2635 lval = -(unsigned long)val;
2636 } else {
2637 *negp = false;
2638 lval = (unsigned long)val;
2639 }
2640 *lvalp = jiffies_to_msecs(lval);
2641 }
2642 return 0;
2643 }
2644
2645 /**
2646 * proc_dointvec_jiffies - read a vector of integers as seconds
2647 * @table: the sysctl table
2648 * @write: %TRUE if this is a write to the sysctl file
2649 * @buffer: the user buffer
2650 * @lenp: the size of the user buffer
2651 * @ppos: file position
2652 *
2653 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2654 * values from/to the user buffer, treated as an ASCII string.
2655 * The values read are assumed to be in seconds, and are converted into
2656 * jiffies.
2657 *
2658 * Returns 0 on success.
2659 */
2660 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2661 void __user *buffer, size_t *lenp, loff_t *ppos)
2662 {
2663 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2664 do_proc_dointvec_jiffies_conv,NULL);
2665 }
2666
2667 /**
2668 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2669 * @table: the sysctl table
2670 * @write: %TRUE if this is a write to the sysctl file
2671 * @buffer: the user buffer
2672 * @lenp: the size of the user buffer
2673 * @ppos: pointer to the file position
2674 *
2675 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2676 * values from/to the user buffer, treated as an ASCII string.
2677 * The values read are assumed to be in 1/USER_HZ seconds, and
2678 * are converted into jiffies.
2679 *
2680 * Returns 0 on success.
2681 */
2682 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2683 void __user *buffer, size_t *lenp, loff_t *ppos)
2684 {
2685 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2686 do_proc_dointvec_userhz_jiffies_conv,NULL);
2687 }
2688
2689 /**
2690 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2691 * @table: the sysctl table
2692 * @write: %TRUE if this is a write to the sysctl file
2693 * @buffer: the user buffer
2694 * @lenp: the size of the user buffer
2695 * @ppos: file position
2696 * @ppos: the current position in the file
2697 *
2698 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2699 * values from/to the user buffer, treated as an ASCII string.
2700 * The values read are assumed to be in 1/1000 seconds, and
2701 * are converted into jiffies.
2702 *
2703 * Returns 0 on success.
2704 */
2705 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2706 void __user *buffer, size_t *lenp, loff_t *ppos)
2707 {
2708 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2709 do_proc_dointvec_ms_jiffies_conv, NULL);
2710 }
2711
2712 static int proc_do_cad_pid(struct ctl_table *table, int write,
2713 void __user *buffer, size_t *lenp, loff_t *ppos)
2714 {
2715 struct pid *new_pid;
2716 pid_t tmp;
2717 int r;
2718
2719 tmp = pid_vnr(cad_pid);
2720
2721 r = __do_proc_dointvec(&tmp, table, write, buffer,
2722 lenp, ppos, NULL, NULL);
2723 if (r || !write)
2724 return r;
2725
2726 new_pid = find_get_pid(tmp);
2727 if (!new_pid)
2728 return -ESRCH;
2729
2730 put_pid(xchg(&cad_pid, new_pid));
2731 return 0;
2732 }
2733
2734 /**
2735 * proc_do_large_bitmap - read/write from/to a large bitmap
2736 * @table: the sysctl table
2737 * @write: %TRUE if this is a write to the sysctl file
2738 * @buffer: the user buffer
2739 * @lenp: the size of the user buffer
2740 * @ppos: file position
2741 *
2742 * The bitmap is stored at table->data and the bitmap length (in bits)
2743 * in table->maxlen.
2744 *
2745 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2746 * large bitmaps may be represented in a compact manner. Writing into
2747 * the file will clear the bitmap then update it with the given input.
2748 *
2749 * Returns 0 on success.
2750 */
2751 int proc_do_large_bitmap(struct ctl_table *table, int write,
2752 void __user *buffer, size_t *lenp, loff_t *ppos)
2753 {
2754 int err = 0;
2755 bool first = 1;
2756 size_t left = *lenp;
2757 unsigned long bitmap_len = table->maxlen;
2758 unsigned long *bitmap = *(unsigned long **) table->data;
2759 unsigned long *tmp_bitmap = NULL;
2760 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2761
2762 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2763 *lenp = 0;
2764 return 0;
2765 }
2766
2767 if (write) {
2768 char *kbuf, *p;
2769
2770 if (left > PAGE_SIZE - 1)
2771 left = PAGE_SIZE - 1;
2772
2773 p = kbuf = memdup_user_nul(buffer, left);
2774 if (IS_ERR(kbuf))
2775 return PTR_ERR(kbuf);
2776
2777 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2778 GFP_KERNEL);
2779 if (!tmp_bitmap) {
2780 kfree(kbuf);
2781 return -ENOMEM;
2782 }
2783 proc_skip_char(&p, &left, '\n');
2784 while (!err && left) {
2785 unsigned long val_a, val_b;
2786 bool neg;
2787
2788 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2789 sizeof(tr_a), &c);
2790 if (err)
2791 break;
2792 if (val_a >= bitmap_len || neg) {
2793 err = -EINVAL;
2794 break;
2795 }
2796
2797 val_b = val_a;
2798 if (left) {
2799 p++;
2800 left--;
2801 }
2802
2803 if (c == '-') {
2804 err = proc_get_long(&p, &left, &val_b,
2805 &neg, tr_b, sizeof(tr_b),
2806 &c);
2807 if (err)
2808 break;
2809 if (val_b >= bitmap_len || neg ||
2810 val_a > val_b) {
2811 err = -EINVAL;
2812 break;
2813 }
2814 if (left) {
2815 p++;
2816 left--;
2817 }
2818 }
2819
2820 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2821 first = 0;
2822 proc_skip_char(&p, &left, '\n');
2823 }
2824 kfree(kbuf);
2825 } else {
2826 unsigned long bit_a, bit_b = 0;
2827
2828 while (left) {
2829 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2830 if (bit_a >= bitmap_len)
2831 break;
2832 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2833 bit_a + 1) - 1;
2834
2835 if (!first) {
2836 err = proc_put_char(&buffer, &left, ',');
2837 if (err)
2838 break;
2839 }
2840 err = proc_put_long(&buffer, &left, bit_a, false);
2841 if (err)
2842 break;
2843 if (bit_a != bit_b) {
2844 err = proc_put_char(&buffer, &left, '-');
2845 if (err)
2846 break;
2847 err = proc_put_long(&buffer, &left, bit_b, false);
2848 if (err)
2849 break;
2850 }
2851
2852 first = 0; bit_b++;
2853 }
2854 if (!err)
2855 err = proc_put_char(&buffer, &left, '\n');
2856 }
2857
2858 if (!err) {
2859 if (write) {
2860 if (*ppos)
2861 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2862 else
2863 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2864 }
2865 kfree(tmp_bitmap);
2866 *lenp -= left;
2867 *ppos += *lenp;
2868 return 0;
2869 } else {
2870 kfree(tmp_bitmap);
2871 return err;
2872 }
2873 }
2874
2875 #else /* CONFIG_PROC_SYSCTL */
2876
2877 int proc_dostring(struct ctl_table *table, int write,
2878 void __user *buffer, size_t *lenp, loff_t *ppos)
2879 {
2880 return -ENOSYS;
2881 }
2882
2883 int proc_dointvec(struct ctl_table *table, int write,
2884 void __user *buffer, size_t *lenp, loff_t *ppos)
2885 {
2886 return -ENOSYS;
2887 }
2888
2889 int proc_douintvec(struct ctl_table *table, int write,
2890 void __user *buffer, size_t *lenp, loff_t *ppos)
2891 {
2892 return -ENOSYS;
2893 }
2894
2895 int proc_dointvec_minmax(struct ctl_table *table, int write,
2896 void __user *buffer, size_t *lenp, loff_t *ppos)
2897 {
2898 return -ENOSYS;
2899 }
2900
2901 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2902 void __user *buffer, size_t *lenp, loff_t *ppos)
2903 {
2904 return -ENOSYS;
2905 }
2906
2907 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2908 void __user *buffer, size_t *lenp, loff_t *ppos)
2909 {
2910 return -ENOSYS;
2911 }
2912
2913 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2914 void __user *buffer, size_t *lenp, loff_t *ppos)
2915 {
2916 return -ENOSYS;
2917 }
2918
2919 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2920 void __user *buffer, size_t *lenp, loff_t *ppos)
2921 {
2922 return -ENOSYS;
2923 }
2924
2925 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2926 void __user *buffer,
2927 size_t *lenp, loff_t *ppos)
2928 {
2929 return -ENOSYS;
2930 }
2931
2932
2933 #endif /* CONFIG_PROC_SYSCTL */
2934
2935 /*
2936 * No sense putting this after each symbol definition, twice,
2937 * exception granted :-)
2938 */
2939 EXPORT_SYMBOL(proc_dointvec);
2940 EXPORT_SYMBOL(proc_douintvec);
2941 EXPORT_SYMBOL(proc_dointvec_jiffies);
2942 EXPORT_SYMBOL(proc_dointvec_minmax);
2943 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2944 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2945 EXPORT_SYMBOL(proc_dostring);
2946 EXPORT_SYMBOL(proc_doulongvec_minmax);
2947 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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