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Linux 4.9.151
[linux/fpc-iii.git] / kernel / sysctl.c
blob23f658d311c05d40797e3459c7fdfcb2df6c046b
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_minmax,
349 .extra1 = &one,
350 },
351 {
352 .procname = "sched_shares_window_ns",
353 .data = &sysctl_sched_shares_window,
354 .maxlen = sizeof(unsigned int),
355 .mode = 0644,
356 .proc_handler = proc_dointvec,
357 },
358 #ifdef CONFIG_SCHEDSTATS
359 {
360 .procname = "sched_schedstats",
361 .data = NULL,
362 .maxlen = sizeof(unsigned int),
363 .mode = 0644,
364 .proc_handler = sysctl_schedstats,
365 .extra1 = &zero,
366 .extra2 = &one,
367 },
368 #endif /* CONFIG_SCHEDSTATS */
369 #endif /* CONFIG_SMP */
370 #ifdef CONFIG_NUMA_BALANCING
371 {
372 .procname = "numa_balancing_scan_delay_ms",
373 .data = &sysctl_numa_balancing_scan_delay,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
378 {
379 .procname = "numa_balancing_scan_period_min_ms",
380 .data = &sysctl_numa_balancing_scan_period_min,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec,
384 },
385 {
386 .procname = "numa_balancing_scan_period_max_ms",
387 .data = &sysctl_numa_balancing_scan_period_max,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec,
391 },
392 {
393 .procname = "numa_balancing_scan_size_mb",
394 .data = &sysctl_numa_balancing_scan_size,
395 .maxlen = sizeof(unsigned int),
396 .mode = 0644,
397 .proc_handler = proc_dointvec_minmax,
398 .extra1 = &one,
399 },
400 {
401 .procname = "numa_balancing",
402 .data = NULL, /* filled in by handler */
403 .maxlen = sizeof(unsigned int),
404 .mode = 0644,
405 .proc_handler = sysctl_numa_balancing,
406 .extra1 = &zero,
407 .extra2 = &one,
408 },
409 #endif /* CONFIG_NUMA_BALANCING */
410 #endif /* CONFIG_SCHED_DEBUG */
411 {
412 .procname = "sched_rt_period_us",
413 .data = &sysctl_sched_rt_period,
414 .maxlen = sizeof(unsigned int),
415 .mode = 0644,
416 .proc_handler = sched_rt_handler,
417 },
418 {
419 .procname = "sched_rt_runtime_us",
420 .data = &sysctl_sched_rt_runtime,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = sched_rt_handler,
424 },
425 {
426 .procname = "sched_rr_timeslice_ms",
427 .data = &sched_rr_timeslice,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = sched_rr_handler,
431 },
432 #ifdef CONFIG_SCHED_AUTOGROUP
433 {
434 .procname = "sched_autogroup_enabled",
435 .data = &sysctl_sched_autogroup_enabled,
436 .maxlen = sizeof(unsigned int),
437 .mode = 0644,
438 .proc_handler = proc_dointvec_minmax,
439 .extra1 = &zero,
440 .extra2 = &one,
441 },
442 #endif
443 #ifdef CONFIG_CFS_BANDWIDTH
444 {
445 .procname = "sched_cfs_bandwidth_slice_us",
446 .data = &sysctl_sched_cfs_bandwidth_slice,
447 .maxlen = sizeof(unsigned int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec_minmax,
450 .extra1 = &one,
451 },
452 #endif
453 #ifdef CONFIG_PROVE_LOCKING
454 {
455 .procname = "prove_locking",
456 .data = &prove_locking,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 #endif
462 #ifdef CONFIG_LOCK_STAT
463 {
464 .procname = "lock_stat",
465 .data = &lock_stat,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec,
469 },
470 #endif
471 {
472 .procname = "panic",
473 .data = &panic_timeout,
474 .maxlen = sizeof(int),
475 .mode = 0644,
476 .proc_handler = proc_dointvec,
477 },
478 #ifdef CONFIG_COREDUMP
479 {
480 .procname = "core_uses_pid",
481 .data = &core_uses_pid,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 {
487 .procname = "core_pattern",
488 .data = core_pattern,
489 .maxlen = CORENAME_MAX_SIZE,
490 .mode = 0644,
491 .proc_handler = proc_dostring_coredump,
492 },
493 {
494 .procname = "core_pipe_limit",
495 .data = &core_pipe_limit,
496 .maxlen = sizeof(unsigned int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 #endif
501 #ifdef CONFIG_PROC_SYSCTL
502 {
503 .procname = "tainted",
504 .maxlen = sizeof(long),
505 .mode = 0644,
506 .proc_handler = proc_taint,
507 },
508 {
509 .procname = "sysctl_writes_strict",
510 .data = &sysctl_writes_strict,
511 .maxlen = sizeof(int),
512 .mode = 0644,
513 .proc_handler = proc_dointvec_minmax,
514 .extra1 = &neg_one,
515 .extra2 = &one,
516 },
517 #endif
518 #ifdef CONFIG_LATENCYTOP
519 {
520 .procname = "latencytop",
521 .data = &latencytop_enabled,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = sysctl_latencytop,
525 },
526 #endif
527 #ifdef CONFIG_BLK_DEV_INITRD
528 {
529 .procname = "real-root-dev",
530 .data = &real_root_dev,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec,
534 },
535 #endif
536 {
537 .procname = "print-fatal-signals",
538 .data = &print_fatal_signals,
539 .maxlen = sizeof(int),
540 .mode = 0644,
541 .proc_handler = proc_dointvec,
542 },
543 #ifdef CONFIG_SPARC
544 {
545 .procname = "reboot-cmd",
546 .data = reboot_command,
547 .maxlen = 256,
548 .mode = 0644,
549 .proc_handler = proc_dostring,
550 },
551 {
552 .procname = "stop-a",
553 .data = &stop_a_enabled,
554 .maxlen = sizeof (int),
555 .mode = 0644,
556 .proc_handler = proc_dointvec,
557 },
558 {
559 .procname = "scons-poweroff",
560 .data = &scons_pwroff,
561 .maxlen = sizeof (int),
562 .mode = 0644,
563 .proc_handler = proc_dointvec,
564 },
565 #endif
566 #ifdef CONFIG_SPARC64
567 {
568 .procname = "tsb-ratio",
569 .data = &sysctl_tsb_ratio,
570 .maxlen = sizeof (int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec,
573 },
574 #endif
575 #ifdef __hppa__
576 {
577 .procname = "soft-power",
578 .data = &pwrsw_enabled,
579 .maxlen = sizeof (int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec,
582 },
583 #endif
584 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
585 {
586 .procname = "unaligned-trap",
587 .data = &unaligned_enabled,
588 .maxlen = sizeof (int),
589 .mode = 0644,
590 .proc_handler = proc_dointvec,
591 },
592 #endif
593 {
594 .procname = "ctrl-alt-del",
595 .data = &C_A_D,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec,
599 },
600 #ifdef CONFIG_FUNCTION_TRACER
601 {
602 .procname = "ftrace_enabled",
603 .data = &ftrace_enabled,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = ftrace_enable_sysctl,
607 },
608 #endif
609 #ifdef CONFIG_STACK_TRACER
610 {
611 .procname = "stack_tracer_enabled",
612 .data = &stack_tracer_enabled,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = stack_trace_sysctl,
616 },
617 #endif
618 #ifdef CONFIG_TRACING
619 {
620 .procname = "ftrace_dump_on_oops",
621 .data = &ftrace_dump_on_oops,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 .proc_handler = proc_dointvec,
625 },
626 {
627 .procname = "traceoff_on_warning",
628 .data = &__disable_trace_on_warning,
629 .maxlen = sizeof(__disable_trace_on_warning),
630 .mode = 0644,
631 .proc_handler = proc_dointvec,
632 },
633 {
634 .procname = "tracepoint_printk",
635 .data = &tracepoint_printk,
636 .maxlen = sizeof(tracepoint_printk),
637 .mode = 0644,
638 .proc_handler = proc_dointvec,
639 },
640 #endif
641 #ifdef CONFIG_KEXEC_CORE
642 {
643 .procname = "kexec_load_disabled",
644 .data = &kexec_load_disabled,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 /* only handle a transition from default "0" to "1" */
648 .proc_handler = proc_dointvec_minmax,
649 .extra1 = &one,
650 .extra2 = &one,
651 },
652 #endif
653 #ifdef CONFIG_MODULES
654 {
655 .procname = "modprobe",
656 .data = &modprobe_path,
657 .maxlen = KMOD_PATH_LEN,
658 .mode = 0644,
659 .proc_handler = proc_dostring,
660 },
661 {
662 .procname = "modules_disabled",
663 .data = &modules_disabled,
664 .maxlen = sizeof(int),
665 .mode = 0644,
666 /* only handle a transition from default "0" to "1" */
667 .proc_handler = proc_dointvec_minmax,
668 .extra1 = &one,
669 .extra2 = &one,
670 },
671 #endif
672 #ifdef CONFIG_UEVENT_HELPER
673 {
674 .procname = "hotplug",
675 .data = &uevent_helper,
676 .maxlen = UEVENT_HELPER_PATH_LEN,
677 .mode = 0644,
678 .proc_handler = proc_dostring,
679 },
680 #endif
681 #ifdef CONFIG_CHR_DEV_SG
682 {
683 .procname = "sg-big-buff",
684 .data = &sg_big_buff,
685 .maxlen = sizeof (int),
686 .mode = 0444,
687 .proc_handler = proc_dointvec,
688 },
689 #endif
690 #ifdef CONFIG_BSD_PROCESS_ACCT
691 {
692 .procname = "acct",
693 .data = &acct_parm,
694 .maxlen = 3*sizeof(int),
695 .mode = 0644,
696 .proc_handler = proc_dointvec,
697 },
698 #endif
699 #ifdef CONFIG_MAGIC_SYSRQ
700 {
701 .procname = "sysrq",
702 .data = &__sysrq_enabled,
703 .maxlen = sizeof (int),
704 .mode = 0644,
705 .proc_handler = sysrq_sysctl_handler,
706 },
707 #endif
708 #ifdef CONFIG_PROC_SYSCTL
709 {
710 .procname = "cad_pid",
711 .data = NULL,
712 .maxlen = sizeof (int),
713 .mode = 0600,
714 .proc_handler = proc_do_cad_pid,
715 },
716 #endif
717 {
718 .procname = "threads-max",
719 .data = NULL,
720 .maxlen = sizeof(int),
721 .mode = 0644,
722 .proc_handler = sysctl_max_threads,
723 },
724 {
725 .procname = "random",
726 .mode = 0555,
727 .child = random_table,
728 },
729 {
730 .procname = "usermodehelper",
731 .mode = 0555,
732 .child = usermodehelper_table,
733 },
734 {
735 .procname = "overflowuid",
736 .data = &overflowuid,
737 .maxlen = sizeof(int),
738 .mode = 0644,
739 .proc_handler = proc_dointvec_minmax,
740 .extra1 = &minolduid,
741 .extra2 = &maxolduid,
742 },
743 {
744 .procname = "overflowgid",
745 .data = &overflowgid,
746 .maxlen = sizeof(int),
747 .mode = 0644,
748 .proc_handler = proc_dointvec_minmax,
749 .extra1 = &minolduid,
750 .extra2 = &maxolduid,
751 },
752 #ifdef CONFIG_S390
753 #ifdef CONFIG_MATHEMU
754 {
755 .procname = "ieee_emulation_warnings",
756 .data = &sysctl_ieee_emulation_warnings,
757 .maxlen = sizeof(int),
758 .mode = 0644,
759 .proc_handler = proc_dointvec,
760 },
761 #endif
762 {
763 .procname = "userprocess_debug",
764 .data = &show_unhandled_signals,
765 .maxlen = sizeof(int),
766 .mode = 0644,
767 .proc_handler = proc_dointvec,
768 },
769 #endif
770 {
771 .procname = "pid_max",
772 .data = &pid_max,
773 .maxlen = sizeof (int),
774 .mode = 0644,
775 .proc_handler = proc_dointvec_minmax,
776 .extra1 = &pid_max_min,
777 .extra2 = &pid_max_max,
778 },
779 {
780 .procname = "panic_on_oops",
781 .data = &panic_on_oops,
782 .maxlen = sizeof(int),
783 .mode = 0644,
784 .proc_handler = proc_dointvec,
785 },
786 #if defined CONFIG_PRINTK
787 {
788 .procname = "printk",
789 .data = &console_loglevel,
790 .maxlen = 4*sizeof(int),
791 .mode = 0644,
792 .proc_handler = proc_dointvec,
793 },
794 {
795 .procname = "printk_ratelimit",
796 .data = &printk_ratelimit_state.interval,
797 .maxlen = sizeof(int),
798 .mode = 0644,
799 .proc_handler = proc_dointvec_jiffies,
800 },
801 {
802 .procname = "printk_ratelimit_burst",
803 .data = &printk_ratelimit_state.burst,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec,
807 },
808 {
809 .procname = "printk_delay",
810 .data = &printk_delay_msec,
811 .maxlen = sizeof(int),
812 .mode = 0644,
813 .proc_handler = proc_dointvec_minmax,
814 .extra1 = &zero,
815 .extra2 = &ten_thousand,
816 },
817 {
818 .procname = "printk_devkmsg",
819 .data = devkmsg_log_str,
820 .maxlen = DEVKMSG_STR_MAX_SIZE,
821 .mode = 0644,
822 .proc_handler = devkmsg_sysctl_set_loglvl,
823 },
824 {
825 .procname = "dmesg_restrict",
826 .data = &dmesg_restrict,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec_minmax_sysadmin,
830 .extra1 = &zero,
831 .extra2 = &one,
832 },
833 {
834 .procname = "kptr_restrict",
835 .data = &kptr_restrict,
836 .maxlen = sizeof(int),
837 .mode = 0644,
838 .proc_handler = proc_dointvec_minmax_sysadmin,
839 .extra1 = &zero,
840 .extra2 = &two,
841 },
842 #endif
843 {
844 .procname = "ngroups_max",
845 .data = &ngroups_max,
846 .maxlen = sizeof (int),
847 .mode = 0444,
848 .proc_handler = proc_dointvec,
849 },
850 {
851 .procname = "cap_last_cap",
852 .data = (void *)&cap_last_cap,
853 .maxlen = sizeof(int),
854 .mode = 0444,
855 .proc_handler = proc_dointvec,
856 },
857 #if defined(CONFIG_LOCKUP_DETECTOR)
858 {
859 .procname = "watchdog",
860 .data = &watchdog_user_enabled,
861 .maxlen = sizeof (int),
862 .mode = 0644,
863 .proc_handler = proc_watchdog,
864 .extra1 = &zero,
865 .extra2 = &one,
866 },
867 {
868 .procname = "watchdog_thresh",
869 .data = &watchdog_thresh,
870 .maxlen = sizeof(int),
871 .mode = 0644,
872 .proc_handler = proc_watchdog_thresh,
873 .extra1 = &zero,
874 .extra2 = &sixty,
875 },
876 {
877 .procname = "nmi_watchdog",
878 .data = &nmi_watchdog_enabled,
879 .maxlen = sizeof (int),
880 .mode = 0644,
881 .proc_handler = proc_nmi_watchdog,
882 .extra1 = &zero,
883 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
884 .extra2 = &one,
885 #else
886 .extra2 = &zero,
887 #endif
888 },
889 {
890 .procname = "soft_watchdog",
891 .data = &soft_watchdog_enabled,
892 .maxlen = sizeof (int),
893 .mode = 0644,
894 .proc_handler = proc_soft_watchdog,
895 .extra1 = &zero,
896 .extra2 = &one,
897 },
898 {
899 .procname = "watchdog_cpumask",
900 .data = &watchdog_cpumask_bits,
901 .maxlen = NR_CPUS,
902 .mode = 0644,
903 .proc_handler = proc_watchdog_cpumask,
904 },
905 {
906 .procname = "softlockup_panic",
907 .data = &softlockup_panic,
908 .maxlen = sizeof(int),
909 .mode = 0644,
910 .proc_handler = proc_dointvec_minmax,
911 .extra1 = &zero,
912 .extra2 = &one,
913 },
914 #ifdef CONFIG_HARDLOCKUP_DETECTOR
915 {
916 .procname = "hardlockup_panic",
917 .data = &hardlockup_panic,
918 .maxlen = sizeof(int),
919 .mode = 0644,
920 .proc_handler = proc_dointvec_minmax,
921 .extra1 = &zero,
922 .extra2 = &one,
923 },
924 #endif
925 #ifdef CONFIG_SMP
926 {
927 .procname = "softlockup_all_cpu_backtrace",
928 .data = &sysctl_softlockup_all_cpu_backtrace,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec_minmax,
932 .extra1 = &zero,
933 .extra2 = &one,
934 },
935 {
936 .procname = "hardlockup_all_cpu_backtrace",
937 .data = &sysctl_hardlockup_all_cpu_backtrace,
938 .maxlen = sizeof(int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec_minmax,
941 .extra1 = &zero,
942 .extra2 = &one,
943 },
944 #endif /* CONFIG_SMP */
945 #endif
946 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
947 {
948 .procname = "unknown_nmi_panic",
949 .data = &unknown_nmi_panic,
950 .maxlen = sizeof (int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec,
953 },
954 #endif
955 #if defined(CONFIG_X86)
956 {
957 .procname = "panic_on_unrecovered_nmi",
958 .data = &panic_on_unrecovered_nmi,
959 .maxlen = sizeof(int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec,
962 },
963 {
964 .procname = "panic_on_io_nmi",
965 .data = &panic_on_io_nmi,
966 .maxlen = sizeof(int),
967 .mode = 0644,
968 .proc_handler = proc_dointvec,
969 },
970 #ifdef CONFIG_DEBUG_STACKOVERFLOW
971 {
972 .procname = "panic_on_stackoverflow",
973 .data = &sysctl_panic_on_stackoverflow,
974 .maxlen = sizeof(int),
975 .mode = 0644,
976 .proc_handler = proc_dointvec,
977 },
978 #endif
979 {
980 .procname = "bootloader_type",
981 .data = &bootloader_type,
982 .maxlen = sizeof (int),
983 .mode = 0444,
984 .proc_handler = proc_dointvec,
985 },
986 {
987 .procname = "bootloader_version",
988 .data = &bootloader_version,
989 .maxlen = sizeof (int),
990 .mode = 0444,
991 .proc_handler = proc_dointvec,
992 },
993 {
994 .procname = "kstack_depth_to_print",
995 .data = &kstack_depth_to_print,
996 .maxlen = sizeof(int),
997 .mode = 0644,
998 .proc_handler = proc_dointvec,
999 },
1000 {
1001 .procname = "io_delay_type",
1002 .data = &io_delay_type,
1003 .maxlen = sizeof(int),
1004 .mode = 0644,
1005 .proc_handler = proc_dointvec,
1006 },
1007 #endif
1008 #if defined(CONFIG_MMU)
1009 {
1010 .procname = "randomize_va_space",
1011 .data = &randomize_va_space,
1012 .maxlen = sizeof(int),
1013 .mode = 0644,
1014 .proc_handler = proc_dointvec,
1015 },
1016 #endif
1017 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1018 {
1019 .procname = "spin_retry",
1020 .data = &spin_retry,
1021 .maxlen = sizeof (int),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025 #endif
1026 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1027 {
1028 .procname = "acpi_video_flags",
1029 .data = &acpi_realmode_flags,
1030 .maxlen = sizeof (unsigned long),
1031 .mode = 0644,
1032 .proc_handler = proc_doulongvec_minmax,
1033 },
1034 #endif
1035 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1036 {
1037 .procname = "ignore-unaligned-usertrap",
1038 .data = &no_unaligned_warning,
1039 .maxlen = sizeof (int),
1040 .mode = 0644,
1041 .proc_handler = proc_dointvec,
1042 },
1043 #endif
1044 #ifdef CONFIG_IA64
1045 {
1046 .procname = "unaligned-dump-stack",
1047 .data = &unaligned_dump_stack,
1048 .maxlen = sizeof (int),
1049 .mode = 0644,
1050 .proc_handler = proc_dointvec,
1051 },
1052 #endif
1053 #ifdef CONFIG_DETECT_HUNG_TASK
1054 {
1055 .procname = "hung_task_panic",
1056 .data = &sysctl_hung_task_panic,
1057 .maxlen = sizeof(int),
1058 .mode = 0644,
1059 .proc_handler = proc_dointvec_minmax,
1060 .extra1 = &zero,
1061 .extra2 = &one,
1062 },
1063 {
1064 .procname = "hung_task_check_count",
1065 .data = &sysctl_hung_task_check_count,
1066 .maxlen = sizeof(int),
1067 .mode = 0644,
1068 .proc_handler = proc_dointvec_minmax,
1069 .extra1 = &zero,
1070 },
1071 {
1072 .procname = "hung_task_timeout_secs",
1073 .data = &sysctl_hung_task_timeout_secs,
1074 .maxlen = sizeof(unsigned long),
1075 .mode = 0644,
1076 .proc_handler = proc_dohung_task_timeout_secs,
1077 .extra2 = &hung_task_timeout_max,
1078 },
1079 {
1080 .procname = "hung_task_warnings",
1081 .data = &sysctl_hung_task_warnings,
1082 .maxlen = sizeof(int),
1083 .mode = 0644,
1084 .proc_handler = proc_dointvec_minmax,
1085 .extra1 = &neg_one,
1086 },
1087 #endif
1088 #ifdef CONFIG_RT_MUTEXES
1089 {
1090 .procname = "max_lock_depth",
1091 .data = &max_lock_depth,
1092 .maxlen = sizeof(int),
1093 .mode = 0644,
1094 .proc_handler = proc_dointvec,
1095 },
1096 #endif
1097 {
1098 .procname = "poweroff_cmd",
1099 .data = &poweroff_cmd,
1100 .maxlen = POWEROFF_CMD_PATH_LEN,
1101 .mode = 0644,
1102 .proc_handler = proc_dostring,
1103 },
1104 #ifdef CONFIG_KEYS
1105 {
1106 .procname = "keys",
1107 .mode = 0555,
1108 .child = key_sysctls,
1109 },
1110 #endif
1111 #ifdef CONFIG_PERF_EVENTS
1112 /*
1113 * User-space scripts rely on the existence of this file
1114 * as a feature check for perf_events being enabled.
1115 *
1116 * So it's an ABI, do not remove!
1117 */
1118 {
1119 .procname = "perf_event_paranoid",
1120 .data = &sysctl_perf_event_paranoid,
1121 .maxlen = sizeof(sysctl_perf_event_paranoid),
1122 .mode = 0644,
1123 .proc_handler = proc_dointvec,
1124 },
1125 {
1126 .procname = "perf_event_mlock_kb",
1127 .data = &sysctl_perf_event_mlock,
1128 .maxlen = sizeof(sysctl_perf_event_mlock),
1129 .mode = 0644,
1130 .proc_handler = proc_dointvec,
1131 },
1132 {
1133 .procname = "perf_event_max_sample_rate",
1134 .data = &sysctl_perf_event_sample_rate,
1135 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1136 .mode = 0644,
1137 .proc_handler = perf_proc_update_handler,
1138 .extra1 = &one,
1139 },
1140 {
1141 .procname = "perf_cpu_time_max_percent",
1142 .data = &sysctl_perf_cpu_time_max_percent,
1143 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1144 .mode = 0644,
1145 .proc_handler = perf_cpu_time_max_percent_handler,
1146 .extra1 = &zero,
1147 .extra2 = &one_hundred,
1148 },
1149 {
1150 .procname = "perf_event_max_stack",
1151 .data = &sysctl_perf_event_max_stack,
1152 .maxlen = sizeof(sysctl_perf_event_max_stack),
1153 .mode = 0644,
1154 .proc_handler = perf_event_max_stack_handler,
1155 .extra1 = &zero,
1156 .extra2 = &six_hundred_forty_kb,
1157 },
1158 {
1159 .procname = "perf_event_max_contexts_per_stack",
1160 .data = &sysctl_perf_event_max_contexts_per_stack,
1161 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1162 .mode = 0644,
1163 .proc_handler = perf_event_max_stack_handler,
1164 .extra1 = &zero,
1165 .extra2 = &one_thousand,
1166 },
1167 #endif
1168 #ifdef CONFIG_KMEMCHECK
1169 {
1170 .procname = "kmemcheck",
1171 .data = &kmemcheck_enabled,
1172 .maxlen = sizeof(int),
1173 .mode = 0644,
1174 .proc_handler = proc_dointvec,
1175 },
1176 #endif
1177 {
1178 .procname = "panic_on_warn",
1179 .data = &panic_on_warn,
1180 .maxlen = sizeof(int),
1181 .mode = 0644,
1182 .proc_handler = proc_dointvec_minmax,
1183 .extra1 = &zero,
1184 .extra2 = &one,
1185 },
1186 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1187 {
1188 .procname = "timer_migration",
1189 .data = &sysctl_timer_migration,
1190 .maxlen = sizeof(unsigned int),
1191 .mode = 0644,
1192 .proc_handler = timer_migration_handler,
1193 .extra1 = &zero,
1194 .extra2 = &one,
1195 },
1196 #endif
1197 #ifdef CONFIG_BPF_SYSCALL
1198 {
1199 .procname = "unprivileged_bpf_disabled",
1200 .data = &sysctl_unprivileged_bpf_disabled,
1201 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1202 .mode = 0644,
1203 /* only handle a transition from default "0" to "1" */
1204 .proc_handler = proc_dointvec_minmax,
1205 .extra1 = &one,
1206 .extra2 = &one,
1207 },
1208 #endif
1209 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1210 {
1211 .procname = "panic_on_rcu_stall",
1212 .data = &sysctl_panic_on_rcu_stall,
1213 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1214 .mode = 0644,
1215 .proc_handler = proc_dointvec_minmax,
1216 .extra1 = &zero,
1217 .extra2 = &one,
1218 },
1219 #endif
1220 { }
1221 };
1222
1223 static struct ctl_table vm_table[] = {
1224 {
1225 .procname = "overcommit_memory",
1226 .data = &sysctl_overcommit_memory,
1227 .maxlen = sizeof(sysctl_overcommit_memory),
1228 .mode = 0644,
1229 .proc_handler = proc_dointvec_minmax,
1230 .extra1 = &zero,
1231 .extra2 = &two,
1232 },
1233 {
1234 .procname = "panic_on_oom",
1235 .data = &sysctl_panic_on_oom,
1236 .maxlen = sizeof(sysctl_panic_on_oom),
1237 .mode = 0644,
1238 .proc_handler = proc_dointvec_minmax,
1239 .extra1 = &zero,
1240 .extra2 = &two,
1241 },
1242 {
1243 .procname = "oom_kill_allocating_task",
1244 .data = &sysctl_oom_kill_allocating_task,
1245 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1246 .mode = 0644,
1247 .proc_handler = proc_dointvec,
1248 },
1249 {
1250 .procname = "oom_dump_tasks",
1251 .data = &sysctl_oom_dump_tasks,
1252 .maxlen = sizeof(sysctl_oom_dump_tasks),
1253 .mode = 0644,
1254 .proc_handler = proc_dointvec,
1255 },
1256 {
1257 .procname = "overcommit_ratio",
1258 .data = &sysctl_overcommit_ratio,
1259 .maxlen = sizeof(sysctl_overcommit_ratio),
1260 .mode = 0644,
1261 .proc_handler = overcommit_ratio_handler,
1262 },
1263 {
1264 .procname = "overcommit_kbytes",
1265 .data = &sysctl_overcommit_kbytes,
1266 .maxlen = sizeof(sysctl_overcommit_kbytes),
1267 .mode = 0644,
1268 .proc_handler = overcommit_kbytes_handler,
1269 },
1270 {
1271 .procname = "page-cluster",
1272 .data = &page_cluster,
1273 .maxlen = sizeof(int),
1274 .mode = 0644,
1275 .proc_handler = proc_dointvec_minmax,
1276 .extra1 = &zero,
1277 },
1278 {
1279 .procname = "dirty_background_ratio",
1280 .data = &dirty_background_ratio,
1281 .maxlen = sizeof(dirty_background_ratio),
1282 .mode = 0644,
1283 .proc_handler = dirty_background_ratio_handler,
1284 .extra1 = &zero,
1285 .extra2 = &one_hundred,
1286 },
1287 {
1288 .procname = "dirty_background_bytes",
1289 .data = &dirty_background_bytes,
1290 .maxlen = sizeof(dirty_background_bytes),
1291 .mode = 0644,
1292 .proc_handler = dirty_background_bytes_handler,
1293 .extra1 = &one_ul,
1294 },
1295 {
1296 .procname = "dirty_ratio",
1297 .data = &vm_dirty_ratio,
1298 .maxlen = sizeof(vm_dirty_ratio),
1299 .mode = 0644,
1300 .proc_handler = dirty_ratio_handler,
1301 .extra1 = &zero,
1302 .extra2 = &one_hundred,
1303 },
1304 {
1305 .procname = "dirty_bytes",
1306 .data = &vm_dirty_bytes,
1307 .maxlen = sizeof(vm_dirty_bytes),
1308 .mode = 0644,
1309 .proc_handler = dirty_bytes_handler,
1310 .extra1 = &dirty_bytes_min,
1311 },
1312 {
1313 .procname = "dirty_writeback_centisecs",
1314 .data = &dirty_writeback_interval,
1315 .maxlen = sizeof(dirty_writeback_interval),
1316 .mode = 0644,
1317 .proc_handler = dirty_writeback_centisecs_handler,
1318 },
1319 {
1320 .procname = "dirty_expire_centisecs",
1321 .data = &dirty_expire_interval,
1322 .maxlen = sizeof(dirty_expire_interval),
1323 .mode = 0644,
1324 .proc_handler = proc_dointvec_minmax,
1325 .extra1 = &zero,
1326 },
1327 {
1328 .procname = "dirtytime_expire_seconds",
1329 .data = &dirtytime_expire_interval,
1330 .maxlen = sizeof(dirty_expire_interval),
1331 .mode = 0644,
1332 .proc_handler = dirtytime_interval_handler,
1333 .extra1 = &zero,
1334 },
1335 {
1336 .procname = "nr_pdflush_threads",
1337 .mode = 0444 /* read-only */,
1338 .proc_handler = pdflush_proc_obsolete,
1339 },
1340 {
1341 .procname = "swappiness",
1342 .data = &vm_swappiness,
1343 .maxlen = sizeof(vm_swappiness),
1344 .mode = 0644,
1345 .proc_handler = proc_dointvec_minmax,
1346 .extra1 = &zero,
1347 .extra2 = &one_hundred,
1348 },
1349 #ifdef CONFIG_HUGETLB_PAGE
1350 {
1351 .procname = "nr_hugepages",
1352 .data = NULL,
1353 .maxlen = sizeof(unsigned long),
1354 .mode = 0644,
1355 .proc_handler = hugetlb_sysctl_handler,
1356 },
1357 #ifdef CONFIG_NUMA
1358 {
1359 .procname = "nr_hugepages_mempolicy",
1360 .data = NULL,
1361 .maxlen = sizeof(unsigned long),
1362 .mode = 0644,
1363 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1364 },
1365 #endif
1366 {
1367 .procname = "hugetlb_shm_group",
1368 .data = &sysctl_hugetlb_shm_group,
1369 .maxlen = sizeof(gid_t),
1370 .mode = 0644,
1371 .proc_handler = proc_dointvec,
1372 },
1373 {
1374 .procname = "hugepages_treat_as_movable",
1375 .data = &hugepages_treat_as_movable,
1376 .maxlen = sizeof(int),
1377 .mode = 0644,
1378 .proc_handler = proc_dointvec,
1379 },
1380 {
1381 .procname = "nr_overcommit_hugepages",
1382 .data = NULL,
1383 .maxlen = sizeof(unsigned long),
1384 .mode = 0644,
1385 .proc_handler = hugetlb_overcommit_handler,
1386 },
1387 #endif
1388 {
1389 .procname = "lowmem_reserve_ratio",
1390 .data = &sysctl_lowmem_reserve_ratio,
1391 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1392 .mode = 0644,
1393 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1394 },
1395 {
1396 .procname = "drop_caches",
1397 .data = &sysctl_drop_caches,
1398 .maxlen = sizeof(int),
1399 .mode = 0644,
1400 .proc_handler = drop_caches_sysctl_handler,
1401 .extra1 = &one,
1402 .extra2 = &four,
1403 },
1404 #ifdef CONFIG_COMPACTION
1405 {
1406 .procname = "compact_memory",
1407 .data = &sysctl_compact_memory,
1408 .maxlen = sizeof(int),
1409 .mode = 0200,
1410 .proc_handler = sysctl_compaction_handler,
1411 },
1412 {
1413 .procname = "extfrag_threshold",
1414 .data = &sysctl_extfrag_threshold,
1415 .maxlen = sizeof(int),
1416 .mode = 0644,
1417 .proc_handler = sysctl_extfrag_handler,
1418 .extra1 = &min_extfrag_threshold,
1419 .extra2 = &max_extfrag_threshold,
1420 },
1421 {
1422 .procname = "compact_unevictable_allowed",
1423 .data = &sysctl_compact_unevictable_allowed,
1424 .maxlen = sizeof(int),
1425 .mode = 0644,
1426 .proc_handler = proc_dointvec,
1427 .extra1 = &zero,
1428 .extra2 = &one,
1429 },
1430
1431 #endif /* CONFIG_COMPACTION */
1432 {
1433 .procname = "min_free_kbytes",
1434 .data = &min_free_kbytes,
1435 .maxlen = sizeof(min_free_kbytes),
1436 .mode = 0644,
1437 .proc_handler = min_free_kbytes_sysctl_handler,
1438 .extra1 = &zero,
1439 },
1440 {
1441 .procname = "watermark_scale_factor",
1442 .data = &watermark_scale_factor,
1443 .maxlen = sizeof(watermark_scale_factor),
1444 .mode = 0644,
1445 .proc_handler = watermark_scale_factor_sysctl_handler,
1446 .extra1 = &one,
1447 .extra2 = &one_thousand,
1448 },
1449 {
1450 .procname = "percpu_pagelist_fraction",
1451 .data = &percpu_pagelist_fraction,
1452 .maxlen = sizeof(percpu_pagelist_fraction),
1453 .mode = 0644,
1454 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1455 .extra1 = &zero,
1456 },
1457 #ifdef CONFIG_MMU
1458 {
1459 .procname = "max_map_count",
1460 .data = &sysctl_max_map_count,
1461 .maxlen = sizeof(sysctl_max_map_count),
1462 .mode = 0644,
1463 .proc_handler = proc_dointvec_minmax,
1464 .extra1 = &zero,
1465 },
1466 #else
1467 {
1468 .procname = "nr_trim_pages",
1469 .data = &sysctl_nr_trim_pages,
1470 .maxlen = sizeof(sysctl_nr_trim_pages),
1471 .mode = 0644,
1472 .proc_handler = proc_dointvec_minmax,
1473 .extra1 = &zero,
1474 },
1475 #endif
1476 {
1477 .procname = "laptop_mode",
1478 .data = &laptop_mode,
1479 .maxlen = sizeof(laptop_mode),
1480 .mode = 0644,
1481 .proc_handler = proc_dointvec_jiffies,
1482 },
1483 {
1484 .procname = "block_dump",
1485 .data = &block_dump,
1486 .maxlen = sizeof(block_dump),
1487 .mode = 0644,
1488 .proc_handler = proc_dointvec,
1489 .extra1 = &zero,
1490 },
1491 {
1492 .procname = "vfs_cache_pressure",
1493 .data = &sysctl_vfs_cache_pressure,
1494 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1495 .mode = 0644,
1496 .proc_handler = proc_dointvec,
1497 .extra1 = &zero,
1498 },
1499 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1500 {
1501 .procname = "legacy_va_layout",
1502 .data = &sysctl_legacy_va_layout,
1503 .maxlen = sizeof(sysctl_legacy_va_layout),
1504 .mode = 0644,
1505 .proc_handler = proc_dointvec,
1506 .extra1 = &zero,
1507 },
1508 #endif
1509 #ifdef CONFIG_NUMA
1510 {
1511 .procname = "zone_reclaim_mode",
1512 .data = &node_reclaim_mode,
1513 .maxlen = sizeof(node_reclaim_mode),
1514 .mode = 0644,
1515 .proc_handler = proc_dointvec,
1516 .extra1 = &zero,
1517 },
1518 {
1519 .procname = "min_unmapped_ratio",
1520 .data = &sysctl_min_unmapped_ratio,
1521 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1522 .mode = 0644,
1523 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1524 .extra1 = &zero,
1525 .extra2 = &one_hundred,
1526 },
1527 {
1528 .procname = "min_slab_ratio",
1529 .data = &sysctl_min_slab_ratio,
1530 .maxlen = sizeof(sysctl_min_slab_ratio),
1531 .mode = 0644,
1532 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1533 .extra1 = &zero,
1534 .extra2 = &one_hundred,
1535 },
1536 #endif
1537 #ifdef CONFIG_SMP
1538 {
1539 .procname = "stat_interval",
1540 .data = &sysctl_stat_interval,
1541 .maxlen = sizeof(sysctl_stat_interval),
1542 .mode = 0644,
1543 .proc_handler = proc_dointvec_jiffies,
1544 },
1545 {
1546 .procname = "stat_refresh",
1547 .data = NULL,
1548 .maxlen = 0,
1549 .mode = 0600,
1550 .proc_handler = vmstat_refresh,
1551 },
1552 #endif
1553 #ifdef CONFIG_MMU
1554 {
1555 .procname = "mmap_min_addr",
1556 .data = &dac_mmap_min_addr,
1557 .maxlen = sizeof(unsigned long),
1558 .mode = 0644,
1559 .proc_handler = mmap_min_addr_handler,
1560 },
1561 #endif
1562 #ifdef CONFIG_NUMA
1563 {
1564 .procname = "numa_zonelist_order",
1565 .data = &numa_zonelist_order,
1566 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1567 .mode = 0644,
1568 .proc_handler = numa_zonelist_order_handler,
1569 },
1570 #endif
1571 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1572 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1573 {
1574 .procname = "vdso_enabled",
1575 #ifdef CONFIG_X86_32
1576 .data = &vdso32_enabled,
1577 .maxlen = sizeof(vdso32_enabled),
1578 #else
1579 .data = &vdso_enabled,
1580 .maxlen = sizeof(vdso_enabled),
1581 #endif
1582 .mode = 0644,
1583 .proc_handler = proc_dointvec,
1584 .extra1 = &zero,
1585 },
1586 #endif
1587 #ifdef CONFIG_HIGHMEM
1588 {
1589 .procname = "highmem_is_dirtyable",
1590 .data = &vm_highmem_is_dirtyable,
1591 .maxlen = sizeof(vm_highmem_is_dirtyable),
1592 .mode = 0644,
1593 .proc_handler = proc_dointvec_minmax,
1594 .extra1 = &zero,
1595 .extra2 = &one,
1596 },
1597 #endif
1598 #ifdef CONFIG_MEMORY_FAILURE
1599 {
1600 .procname = "memory_failure_early_kill",
1601 .data = &sysctl_memory_failure_early_kill,
1602 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1603 .mode = 0644,
1604 .proc_handler = proc_dointvec_minmax,
1605 .extra1 = &zero,
1606 .extra2 = &one,
1607 },
1608 {
1609 .procname = "memory_failure_recovery",
1610 .data = &sysctl_memory_failure_recovery,
1611 .maxlen = sizeof(sysctl_memory_failure_recovery),
1612 .mode = 0644,
1613 .proc_handler = proc_dointvec_minmax,
1614 .extra1 = &zero,
1615 .extra2 = &one,
1616 },
1617 #endif
1618 {
1619 .procname = "user_reserve_kbytes",
1620 .data = &sysctl_user_reserve_kbytes,
1621 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1622 .mode = 0644,
1623 .proc_handler = proc_doulongvec_minmax,
1624 },
1625 {
1626 .procname = "admin_reserve_kbytes",
1627 .data = &sysctl_admin_reserve_kbytes,
1628 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1629 .mode = 0644,
1630 .proc_handler = proc_doulongvec_minmax,
1631 },
1632 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1633 {
1634 .procname = "mmap_rnd_bits",
1635 .data = &mmap_rnd_bits,
1636 .maxlen = sizeof(mmap_rnd_bits),
1637 .mode = 0600,
1638 .proc_handler = proc_dointvec_minmax,
1639 .extra1 = (void *)&mmap_rnd_bits_min,
1640 .extra2 = (void *)&mmap_rnd_bits_max,
1641 },
1642 #endif
1643 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1644 {
1645 .procname = "mmap_rnd_compat_bits",
1646 .data = &mmap_rnd_compat_bits,
1647 .maxlen = sizeof(mmap_rnd_compat_bits),
1648 .mode = 0600,
1649 .proc_handler = proc_dointvec_minmax,
1650 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1651 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1652 },
1653 #endif
1654 { }
1655 };
1656
1657 static struct ctl_table fs_table[] = {
1658 {
1659 .procname = "inode-nr",
1660 .data = &inodes_stat,
1661 .maxlen = 2*sizeof(long),
1662 .mode = 0444,
1663 .proc_handler = proc_nr_inodes,
1664 },
1665 {
1666 .procname = "inode-state",
1667 .data = &inodes_stat,
1668 .maxlen = 7*sizeof(long),
1669 .mode = 0444,
1670 .proc_handler = proc_nr_inodes,
1671 },
1672 {
1673 .procname = "file-nr",
1674 .data = &files_stat,
1675 .maxlen = sizeof(files_stat),
1676 .mode = 0444,
1677 .proc_handler = proc_nr_files,
1678 },
1679 {
1680 .procname = "file-max",
1681 .data = &files_stat.max_files,
1682 .maxlen = sizeof(files_stat.max_files),
1683 .mode = 0644,
1684 .proc_handler = proc_doulongvec_minmax,
1685 },
1686 {
1687 .procname = "nr_open",
1688 .data = &sysctl_nr_open,
1689 .maxlen = sizeof(unsigned int),
1690 .mode = 0644,
1691 .proc_handler = proc_dointvec_minmax,
1692 .extra1 = &sysctl_nr_open_min,
1693 .extra2 = &sysctl_nr_open_max,
1694 },
1695 {
1696 .procname = "dentry-state",
1697 .data = &dentry_stat,
1698 .maxlen = 6*sizeof(long),
1699 .mode = 0444,
1700 .proc_handler = proc_nr_dentry,
1701 },
1702 {
1703 .procname = "overflowuid",
1704 .data = &fs_overflowuid,
1705 .maxlen = sizeof(int),
1706 .mode = 0644,
1707 .proc_handler = proc_dointvec_minmax,
1708 .extra1 = &minolduid,
1709 .extra2 = &maxolduid,
1710 },
1711 {
1712 .procname = "overflowgid",
1713 .data = &fs_overflowgid,
1714 .maxlen = sizeof(int),
1715 .mode = 0644,
1716 .proc_handler = proc_dointvec_minmax,
1717 .extra1 = &minolduid,
1718 .extra2 = &maxolduid,
1719 },
1720 #ifdef CONFIG_FILE_LOCKING
1721 {
1722 .procname = "leases-enable",
1723 .data = &leases_enable,
1724 .maxlen = sizeof(int),
1725 .mode = 0644,
1726 .proc_handler = proc_dointvec,
1727 },
1728 #endif
1729 #ifdef CONFIG_DNOTIFY
1730 {
1731 .procname = "dir-notify-enable",
1732 .data = &dir_notify_enable,
1733 .maxlen = sizeof(int),
1734 .mode = 0644,
1735 .proc_handler = proc_dointvec,
1736 },
1737 #endif
1738 #ifdef CONFIG_MMU
1739 #ifdef CONFIG_FILE_LOCKING
1740 {
1741 .procname = "lease-break-time",
1742 .data = &lease_break_time,
1743 .maxlen = sizeof(int),
1744 .mode = 0644,
1745 .proc_handler = proc_dointvec,
1746 },
1747 #endif
1748 #ifdef CONFIG_AIO
1749 {
1750 .procname = "aio-nr",
1751 .data = &aio_nr,
1752 .maxlen = sizeof(aio_nr),
1753 .mode = 0444,
1754 .proc_handler = proc_doulongvec_minmax,
1755 },
1756 {
1757 .procname = "aio-max-nr",
1758 .data = &aio_max_nr,
1759 .maxlen = sizeof(aio_max_nr),
1760 .mode = 0644,
1761 .proc_handler = proc_doulongvec_minmax,
1762 },
1763 #endif /* CONFIG_AIO */
1764 #ifdef CONFIG_INOTIFY_USER
1765 {
1766 .procname = "inotify",
1767 .mode = 0555,
1768 .child = inotify_table,
1769 },
1770 #endif
1771 #ifdef CONFIG_EPOLL
1772 {
1773 .procname = "epoll",
1774 .mode = 0555,
1775 .child = epoll_table,
1776 },
1777 #endif
1778 #endif
1779 {
1780 .procname = "protected_symlinks",
1781 .data = &sysctl_protected_symlinks,
1782 .maxlen = sizeof(int),
1783 .mode = 0600,
1784 .proc_handler = proc_dointvec_minmax,
1785 .extra1 = &zero,
1786 .extra2 = &one,
1787 },
1788 {
1789 .procname = "protected_hardlinks",
1790 .data = &sysctl_protected_hardlinks,
1791 .maxlen = sizeof(int),
1792 .mode = 0600,
1793 .proc_handler = proc_dointvec_minmax,
1794 .extra1 = &zero,
1795 .extra2 = &one,
1796 },
1797 {
1798 .procname = "protected_fifos",
1799 .data = &sysctl_protected_fifos,
1800 .maxlen = sizeof(int),
1801 .mode = 0600,
1802 .proc_handler = proc_dointvec_minmax,
1803 .extra1 = &zero,
1804 .extra2 = &two,
1805 },
1806 {
1807 .procname = "protected_regular",
1808 .data = &sysctl_protected_regular,
1809 .maxlen = sizeof(int),
1810 .mode = 0600,
1811 .proc_handler = proc_dointvec_minmax,
1812 .extra1 = &zero,
1813 .extra2 = &two,
1814 },
1815 {
1816 .procname = "suid_dumpable",
1817 .data = &suid_dumpable,
1818 .maxlen = sizeof(int),
1819 .mode = 0644,
1820 .proc_handler = proc_dointvec_minmax_coredump,
1821 .extra1 = &zero,
1822 .extra2 = &two,
1823 },
1824 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1825 {
1826 .procname = "binfmt_misc",
1827 .mode = 0555,
1828 .child = sysctl_mount_point,
1829 },
1830 #endif
1831 {
1832 .procname = "pipe-max-size",
1833 .data = &pipe_max_size,
1834 .maxlen = sizeof(int),
1835 .mode = 0644,
1836 .proc_handler = &pipe_proc_fn,
1837 .extra1 = &pipe_min_size,
1838 },
1839 {
1840 .procname = "pipe-user-pages-hard",
1841 .data = &pipe_user_pages_hard,
1842 .maxlen = sizeof(pipe_user_pages_hard),
1843 .mode = 0644,
1844 .proc_handler = proc_doulongvec_minmax,
1845 },
1846 {
1847 .procname = "pipe-user-pages-soft",
1848 .data = &pipe_user_pages_soft,
1849 .maxlen = sizeof(pipe_user_pages_soft),
1850 .mode = 0644,
1851 .proc_handler = proc_doulongvec_minmax,
1852 },
1853 {
1854 .procname = "mount-max",
1855 .data = &sysctl_mount_max,
1856 .maxlen = sizeof(unsigned int),
1857 .mode = 0644,
1858 .proc_handler = proc_dointvec_minmax,
1859 .extra1 = &one,
1860 },
1861 { }
1862 };
1863
1864 static struct ctl_table debug_table[] = {
1865 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1866 {
1867 .procname = "exception-trace",
1868 .data = &show_unhandled_signals,
1869 .maxlen = sizeof(int),
1870 .mode = 0644,
1871 .proc_handler = proc_dointvec
1872 },
1873 #endif
1874 #if defined(CONFIG_OPTPROBES)
1875 {
1876 .procname = "kprobes-optimization",
1877 .data = &sysctl_kprobes_optimization,
1878 .maxlen = sizeof(int),
1879 .mode = 0644,
1880 .proc_handler = proc_kprobes_optimization_handler,
1881 .extra1 = &zero,
1882 .extra2 = &one,
1883 },
1884 #endif
1885 { }
1886 };
1887
1888 static struct ctl_table dev_table[] = {
1889 { }
1890 };
1891
1892 int __init sysctl_init(void)
1893 {
1894 struct ctl_table_header *hdr;
1895
1896 hdr = register_sysctl_table(sysctl_base_table);
1897 kmemleak_not_leak(hdr);
1898 return 0;
1899 }
1900
1901 #endif /* CONFIG_SYSCTL */
1902
1903 /*
1904 * /proc/sys support
1905 */
1906
1907 #ifdef CONFIG_PROC_SYSCTL
1908
1909 static int _proc_do_string(char *data, int maxlen, int write,
1910 char __user *buffer,
1911 size_t *lenp, loff_t *ppos)
1912 {
1913 size_t len;
1914 char __user *p;
1915 char c;
1916
1917 if (!data || !maxlen || !*lenp) {
1918 *lenp = 0;
1919 return 0;
1920 }
1921
1922 if (write) {
1923 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1924 /* Only continue writes not past the end of buffer. */
1925 len = strlen(data);
1926 if (len > maxlen - 1)
1927 len = maxlen - 1;
1928
1929 if (*ppos > len)
1930 return 0;
1931 len = *ppos;
1932 } else {
1933 /* Start writing from beginning of buffer. */
1934 len = 0;
1935 }
1936
1937 *ppos += *lenp;
1938 p = buffer;
1939 while ((p - buffer) < *lenp && len < maxlen - 1) {
1940 if (get_user(c, p++))
1941 return -EFAULT;
1942 if (c == 0 || c == '\n')
1943 break;
1944 data[len++] = c;
1945 }
1946 data[len] = 0;
1947 } else {
1948 len = strlen(data);
1949 if (len > maxlen)
1950 len = maxlen;
1951
1952 if (*ppos > len) {
1953 *lenp = 0;
1954 return 0;
1955 }
1956
1957 data += *ppos;
1958 len -= *ppos;
1959
1960 if (len > *lenp)
1961 len = *lenp;
1962 if (len)
1963 if (copy_to_user(buffer, data, len))
1964 return -EFAULT;
1965 if (len < *lenp) {
1966 if (put_user('\n', buffer + len))
1967 return -EFAULT;
1968 len++;
1969 }
1970 *lenp = len;
1971 *ppos += len;
1972 }
1973 return 0;
1974 }
1975
1976 static void warn_sysctl_write(struct ctl_table *table)
1977 {
1978 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1979 "This will not be supported in the future. To silence this\n"
1980 "warning, set kernel.sysctl_writes_strict = -1\n",
1981 current->comm, table->procname);
1982 }
1983
1984 /**
1985 * proc_dostring - read a string sysctl
1986 * @table: the sysctl table
1987 * @write: %TRUE if this is a write to the sysctl file
1988 * @buffer: the user buffer
1989 * @lenp: the size of the user buffer
1990 * @ppos: file position
1991 *
1992 * Reads/writes a string from/to the user buffer. If the kernel
1993 * buffer provided is not large enough to hold the string, the
1994 * string is truncated. The copied string is %NULL-terminated.
1995 * If the string is being read by the user process, it is copied
1996 * and a newline '\n' is added. It is truncated if the buffer is
1997 * not large enough.
1998 *
1999 * Returns 0 on success.
2000 */
2001 int proc_dostring(struct ctl_table *table, int write,
2002 void __user *buffer, size_t *lenp, loff_t *ppos)
2003 {
2004 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
2005 warn_sysctl_write(table);
2006
2007 return _proc_do_string((char *)(table->data), table->maxlen, write,
2008 (char __user *)buffer, lenp, ppos);
2009 }
2010
2011 static size_t proc_skip_spaces(char **buf)
2012 {
2013 size_t ret;
2014 char *tmp = skip_spaces(*buf);
2015 ret = tmp - *buf;
2016 *buf = tmp;
2017 return ret;
2018 }
2019
2020 static void proc_skip_char(char **buf, size_t *size, const char v)
2021 {
2022 while (*size) {
2023 if (**buf != v)
2024 break;
2025 (*size)--;
2026 (*buf)++;
2027 }
2028 }
2029
2030 #define TMPBUFLEN 22
2031 /**
2032 * proc_get_long - reads an ASCII formatted integer from a user buffer
2033 *
2034 * @buf: a kernel buffer
2035 * @size: size of the kernel buffer
2036 * @val: this is where the number will be stored
2037 * @neg: set to %TRUE if number is negative
2038 * @perm_tr: a vector which contains the allowed trailers
2039 * @perm_tr_len: size of the perm_tr vector
2040 * @tr: pointer to store the trailer character
2041 *
2042 * In case of success %0 is returned and @buf and @size are updated with
2043 * the amount of bytes read. If @tr is non-NULL and a trailing
2044 * character exists (size is non-zero after returning from this
2045 * function), @tr is updated with the trailing character.
2046 */
2047 static int proc_get_long(char **buf, size_t *size,
2048 unsigned long *val, bool *neg,
2049 const char *perm_tr, unsigned perm_tr_len, char *tr)
2050 {
2051 int len;
2052 char *p, tmp[TMPBUFLEN];
2053
2054 if (!*size)
2055 return -EINVAL;
2056
2057 len = *size;
2058 if (len > TMPBUFLEN - 1)
2059 len = TMPBUFLEN - 1;
2060
2061 memcpy(tmp, *buf, len);
2062
2063 tmp[len] = 0;
2064 p = tmp;
2065 if (*p == '-' && *size > 1) {
2066 *neg = true;
2067 p++;
2068 } else
2069 *neg = false;
2070 if (!isdigit(*p))
2071 return -EINVAL;
2072
2073 *val = simple_strtoul(p, &p, 0);
2074
2075 len = p - tmp;
2076
2077 /* We don't know if the next char is whitespace thus we may accept
2078 * invalid integers (e.g. 1234...a) or two integers instead of one
2079 * (e.g. 123...1). So lets not allow such large numbers. */
2080 if (len == TMPBUFLEN - 1)
2081 return -EINVAL;
2082
2083 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2084 return -EINVAL;
2085
2086 if (tr && (len < *size))
2087 *tr = *p;
2088
2089 *buf += len;
2090 *size -= len;
2091
2092 return 0;
2093 }
2094
2095 /**
2096 * proc_put_long - converts an integer to a decimal ASCII formatted string
2097 *
2098 * @buf: the user buffer
2099 * @size: the size of the user buffer
2100 * @val: the integer to be converted
2101 * @neg: sign of the number, %TRUE for negative
2102 *
2103 * In case of success %0 is returned and @buf and @size are updated with
2104 * the amount of bytes written.
2105 */
2106 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2107 bool neg)
2108 {
2109 int len;
2110 char tmp[TMPBUFLEN], *p = tmp;
2111
2112 sprintf(p, "%s%lu", neg ? "-" : "", val);
2113 len = strlen(tmp);
2114 if (len > *size)
2115 len = *size;
2116 if (copy_to_user(*buf, tmp, len))
2117 return -EFAULT;
2118 *size -= len;
2119 *buf += len;
2120 return 0;
2121 }
2122 #undef TMPBUFLEN
2123
2124 static int proc_put_char(void __user **buf, size_t *size, char c)
2125 {
2126 if (*size) {
2127 char __user **buffer = (char __user **)buf;
2128 if (put_user(c, *buffer))
2129 return -EFAULT;
2130 (*size)--, (*buffer)++;
2131 *buf = *buffer;
2132 }
2133 return 0;
2134 }
2135
2136 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2137 int *valp,
2138 int write, void *data)
2139 {
2140 if (write) {
2141 if (*negp) {
2142 if (*lvalp > (unsigned long) INT_MAX + 1)
2143 return -EINVAL;
2144 *valp = -*lvalp;
2145 } else {
2146 if (*lvalp > (unsigned long) INT_MAX)
2147 return -EINVAL;
2148 *valp = *lvalp;
2149 }
2150 } else {
2151 int val = *valp;
2152 if (val < 0) {
2153 *negp = true;
2154 *lvalp = -(unsigned long)val;
2155 } else {
2156 *negp = false;
2157 *lvalp = (unsigned long)val;
2158 }
2159 }
2160 return 0;
2161 }
2162
2163 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2164 int *valp,
2165 int write, void *data)
2166 {
2167 if (write) {
2168 if (*negp)
2169 return -EINVAL;
2170 if (*lvalp > UINT_MAX)
2171 return -EINVAL;
2172 *valp = *lvalp;
2173 } else {
2174 unsigned int val = *valp;
2175 *negp = false;
2176 *lvalp = (unsigned long)val;
2177 }
2178 return 0;
2179 }
2180
2181 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2182
2183 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2184 int write, void __user *buffer,
2185 size_t *lenp, loff_t *ppos,
2186 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2187 int write, void *data),
2188 void *data)
2189 {
2190 int *i, vleft, first = 1, err = 0;
2191 size_t left;
2192 char *kbuf = NULL, *p;
2193
2194 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2195 *lenp = 0;
2196 return 0;
2197 }
2198
2199 i = (int *) tbl_data;
2200 vleft = table->maxlen / sizeof(*i);
2201 left = *lenp;
2202
2203 if (!conv)
2204 conv = do_proc_dointvec_conv;
2205
2206 if (write) {
2207 if (*ppos) {
2208 switch (sysctl_writes_strict) {
2209 case SYSCTL_WRITES_STRICT:
2210 goto out;
2211 case SYSCTL_WRITES_WARN:
2212 warn_sysctl_write(table);
2213 break;
2214 default:
2215 break;
2216 }
2217 }
2218
2219 if (left > PAGE_SIZE - 1)
2220 left = PAGE_SIZE - 1;
2221 p = kbuf = memdup_user_nul(buffer, left);
2222 if (IS_ERR(kbuf))
2223 return PTR_ERR(kbuf);
2224 }
2225
2226 for (; left && vleft--; i++, first=0) {
2227 unsigned long lval;
2228 bool neg;
2229
2230 if (write) {
2231 left -= proc_skip_spaces(&p);
2232
2233 if (!left)
2234 break;
2235 err = proc_get_long(&p, &left, &lval, &neg,
2236 proc_wspace_sep,
2237 sizeof(proc_wspace_sep), NULL);
2238 if (err)
2239 break;
2240 if (conv(&neg, &lval, i, 1, data)) {
2241 err = -EINVAL;
2242 break;
2243 }
2244 } else {
2245 if (conv(&neg, &lval, i, 0, data)) {
2246 err = -EINVAL;
2247 break;
2248 }
2249 if (!first)
2250 err = proc_put_char(&buffer, &left, '\t');
2251 if (err)
2252 break;
2253 err = proc_put_long(&buffer, &left, lval, neg);
2254 if (err)
2255 break;
2256 }
2257 }
2258
2259 if (!write && !first && left && !err)
2260 err = proc_put_char(&buffer, &left, '\n');
2261 if (write && !err && left)
2262 left -= proc_skip_spaces(&p);
2263 if (write) {
2264 kfree(kbuf);
2265 if (first)
2266 return err ? : -EINVAL;
2267 }
2268 *lenp -= left;
2269 out:
2270 *ppos += *lenp;
2271 return err;
2272 }
2273
2274 static int do_proc_dointvec(struct ctl_table *table, int write,
2275 void __user *buffer, size_t *lenp, loff_t *ppos,
2276 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2277 int write, void *data),
2278 void *data)
2279 {
2280 return __do_proc_dointvec(table->data, table, write,
2281 buffer, lenp, ppos, conv, data);
2282 }
2283
2284 /**
2285 * proc_dointvec - read a vector of integers
2286 * @table: the sysctl table
2287 * @write: %TRUE if this is a write to the sysctl file
2288 * @buffer: the user buffer
2289 * @lenp: the size of the user buffer
2290 * @ppos: file position
2291 *
2292 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2293 * values from/to the user buffer, treated as an ASCII string.
2294 *
2295 * Returns 0 on success.
2296 */
2297 int proc_dointvec(struct ctl_table *table, int write,
2298 void __user *buffer, size_t *lenp, loff_t *ppos)
2299 {
2300 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2301 }
2302
2303 /**
2304 * proc_douintvec - read a vector of unsigned integers
2305 * @table: the sysctl table
2306 * @write: %TRUE if this is a write to the sysctl file
2307 * @buffer: the user buffer
2308 * @lenp: the size of the user buffer
2309 * @ppos: file position
2310 *
2311 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2312 * values from/to the user buffer, treated as an ASCII string.
2313 *
2314 * Returns 0 on success.
2315 */
2316 int proc_douintvec(struct ctl_table *table, int write,
2317 void __user *buffer, size_t *lenp, loff_t *ppos)
2318 {
2319 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2320 do_proc_douintvec_conv, NULL);
2321 }
2322
2323 /*
2324 * Taint values can only be increased
2325 * This means we can safely use a temporary.
2326 */
2327 static int proc_taint(struct ctl_table *table, int write,
2328 void __user *buffer, size_t *lenp, loff_t *ppos)
2329 {
2330 struct ctl_table t;
2331 unsigned long tmptaint = get_taint();
2332 int err;
2333
2334 if (write && !capable(CAP_SYS_ADMIN))
2335 return -EPERM;
2336
2337 t = *table;
2338 t.data = &tmptaint;
2339 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2340 if (err < 0)
2341 return err;
2342
2343 if (write) {
2344 /*
2345 * Poor man's atomic or. Not worth adding a primitive
2346 * to everyone's atomic.h for this
2347 */
2348 int i;
2349 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2350 if ((tmptaint >> i) & 1)
2351 add_taint(i, LOCKDEP_STILL_OK);
2352 }
2353 }
2354
2355 return err;
2356 }
2357
2358 #ifdef CONFIG_PRINTK
2359 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2360 void __user *buffer, size_t *lenp, loff_t *ppos)
2361 {
2362 if (write && !capable(CAP_SYS_ADMIN))
2363 return -EPERM;
2364
2365 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2366 }
2367 #endif
2368
2369 struct do_proc_dointvec_minmax_conv_param {
2370 int *min;
2371 int *max;
2372 };
2373
2374 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2375 int *valp,
2376 int write, void *data)
2377 {
2378 struct do_proc_dointvec_minmax_conv_param *param = data;
2379 if (write) {
2380 int val = *negp ? -*lvalp : *lvalp;
2381 if ((param->min && *param->min > val) ||
2382 (param->max && *param->max < val))
2383 return -EINVAL;
2384 *valp = val;
2385 } else {
2386 int val = *valp;
2387 if (val < 0) {
2388 *negp = true;
2389 *lvalp = -(unsigned long)val;
2390 } else {
2391 *negp = false;
2392 *lvalp = (unsigned long)val;
2393 }
2394 }
2395 return 0;
2396 }
2397
2398 /**
2399 * proc_dointvec_minmax - read a vector of integers with min/max values
2400 * @table: the sysctl table
2401 * @write: %TRUE if this is a write to the sysctl file
2402 * @buffer: the user buffer
2403 * @lenp: the size of the user buffer
2404 * @ppos: file position
2405 *
2406 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2407 * values from/to the user buffer, treated as an ASCII string.
2408 *
2409 * This routine will ensure the values are within the range specified by
2410 * table->extra1 (min) and table->extra2 (max).
2411 *
2412 * Returns 0 on success.
2413 */
2414 int proc_dointvec_minmax(struct ctl_table *table, int write,
2415 void __user *buffer, size_t *lenp, loff_t *ppos)
2416 {
2417 struct do_proc_dointvec_minmax_conv_param param = {
2418 .min = (int *) table->extra1,
2419 .max = (int *) table->extra2,
2420 };
2421 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2422 do_proc_dointvec_minmax_conv, &param);
2423 }
2424
2425 static void validate_coredump_safety(void)
2426 {
2427 #ifdef CONFIG_COREDUMP
2428 if (suid_dumpable == SUID_DUMP_ROOT &&
2429 core_pattern[0] != '/' && core_pattern[0] != '|') {
2430 printk(KERN_WARNING "Unsafe core_pattern used with "\
2431 "suid_dumpable=2. Pipe handler or fully qualified "\
2432 "core dump path required.\n");
2433 }
2434 #endif
2435 }
2436
2437 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2438 void __user *buffer, size_t *lenp, loff_t *ppos)
2439 {
2440 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2441 if (!error)
2442 validate_coredump_safety();
2443 return error;
2444 }
2445
2446 #ifdef CONFIG_COREDUMP
2447 static int proc_dostring_coredump(struct ctl_table *table, int write,
2448 void __user *buffer, size_t *lenp, loff_t *ppos)
2449 {
2450 int error = proc_dostring(table, write, buffer, lenp, ppos);
2451 if (!error)
2452 validate_coredump_safety();
2453 return error;
2454 }
2455 #endif
2456
2457 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2458 void __user *buffer,
2459 size_t *lenp, loff_t *ppos,
2460 unsigned long convmul,
2461 unsigned long convdiv)
2462 {
2463 unsigned long *i, *min, *max;
2464 int vleft, first = 1, err = 0;
2465 size_t left;
2466 char *kbuf = NULL, *p;
2467
2468 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2469 *lenp = 0;
2470 return 0;
2471 }
2472
2473 i = (unsigned long *) data;
2474 min = (unsigned long *) table->extra1;
2475 max = (unsigned long *) table->extra2;
2476 vleft = table->maxlen / sizeof(unsigned long);
2477 left = *lenp;
2478
2479 if (write) {
2480 if (*ppos) {
2481 switch (sysctl_writes_strict) {
2482 case SYSCTL_WRITES_STRICT:
2483 goto out;
2484 case SYSCTL_WRITES_WARN:
2485 warn_sysctl_write(table);
2486 break;
2487 default:
2488 break;
2489 }
2490 }
2491
2492 if (left > PAGE_SIZE - 1)
2493 left = PAGE_SIZE - 1;
2494 p = kbuf = memdup_user_nul(buffer, left);
2495 if (IS_ERR(kbuf))
2496 return PTR_ERR(kbuf);
2497 }
2498
2499 for (; left && vleft--; i++, first = 0) {
2500 unsigned long val;
2501
2502 if (write) {
2503 bool neg;
2504
2505 left -= proc_skip_spaces(&p);
2506
2507 err = proc_get_long(&p, &left, &val, &neg,
2508 proc_wspace_sep,
2509 sizeof(proc_wspace_sep), NULL);
2510 if (err)
2511 break;
2512 if (neg)
2513 continue;
2514 val = convmul * val / convdiv;
2515 if ((min && val < *min) || (max && val > *max))
2516 continue;
2517 *i = val;
2518 } else {
2519 val = convdiv * (*i) / convmul;
2520 if (!first) {
2521 err = proc_put_char(&buffer, &left, '\t');
2522 if (err)
2523 break;
2524 }
2525 err = proc_put_long(&buffer, &left, val, false);
2526 if (err)
2527 break;
2528 }
2529 }
2530
2531 if (!write && !first && left && !err)
2532 err = proc_put_char(&buffer, &left, '\n');
2533 if (write && !err)
2534 left -= proc_skip_spaces(&p);
2535 if (write) {
2536 kfree(kbuf);
2537 if (first)
2538 return err ? : -EINVAL;
2539 }
2540 *lenp -= left;
2541 out:
2542 *ppos += *lenp;
2543 return err;
2544 }
2545
2546 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2547 void __user *buffer,
2548 size_t *lenp, loff_t *ppos,
2549 unsigned long convmul,
2550 unsigned long convdiv)
2551 {
2552 return __do_proc_doulongvec_minmax(table->data, table, write,
2553 buffer, lenp, ppos, convmul, convdiv);
2554 }
2555
2556 /**
2557 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2558 * @table: the sysctl table
2559 * @write: %TRUE if this is a write to the sysctl file
2560 * @buffer: the user buffer
2561 * @lenp: the size of the user buffer
2562 * @ppos: file position
2563 *
2564 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2565 * values from/to the user buffer, treated as an ASCII string.
2566 *
2567 * This routine will ensure the values are within the range specified by
2568 * table->extra1 (min) and table->extra2 (max).
2569 *
2570 * Returns 0 on success.
2571 */
2572 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2573 void __user *buffer, size_t *lenp, loff_t *ppos)
2574 {
2575 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2576 }
2577
2578 /**
2579 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2580 * @table: the sysctl table
2581 * @write: %TRUE if this is a write to the sysctl file
2582 * @buffer: the user buffer
2583 * @lenp: the size of the user buffer
2584 * @ppos: file position
2585 *
2586 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2587 * values from/to the user buffer, treated as an ASCII string. The values
2588 * are treated as milliseconds, and converted to jiffies when they are stored.
2589 *
2590 * This routine will ensure the values are within the range specified by
2591 * table->extra1 (min) and table->extra2 (max).
2592 *
2593 * Returns 0 on success.
2594 */
2595 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2596 void __user *buffer,
2597 size_t *lenp, loff_t *ppos)
2598 {
2599 return do_proc_doulongvec_minmax(table, write, buffer,
2600 lenp, ppos, HZ, 1000l);
2601 }
2602
2603
2604 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2605 int *valp,
2606 int write, void *data)
2607 {
2608 if (write) {
2609 if (*lvalp > LONG_MAX / HZ)
2610 return 1;
2611 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2612 } else {
2613 int val = *valp;
2614 unsigned long lval;
2615 if (val < 0) {
2616 *negp = true;
2617 lval = -(unsigned long)val;
2618 } else {
2619 *negp = false;
2620 lval = (unsigned long)val;
2621 }
2622 *lvalp = lval / HZ;
2623 }
2624 return 0;
2625 }
2626
2627 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2628 int *valp,
2629 int write, void *data)
2630 {
2631 if (write) {
2632 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2633 return 1;
2634 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
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_clock_t(lval);
2646 }
2647 return 0;
2648 }
2649
2650 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2651 int *valp,
2652 int write, void *data)
2653 {
2654 if (write) {
2655 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2656
2657 if (jif > INT_MAX)
2658 return 1;
2659 *valp = (int)jif;
2660 } else {
2661 int val = *valp;
2662 unsigned long lval;
2663 if (val < 0) {
2664 *negp = true;
2665 lval = -(unsigned long)val;
2666 } else {
2667 *negp = false;
2668 lval = (unsigned long)val;
2669 }
2670 *lvalp = jiffies_to_msecs(lval);
2671 }
2672 return 0;
2673 }
2674
2675 /**
2676 * proc_dointvec_jiffies - read a vector of integers as seconds
2677 * @table: the sysctl table
2678 * @write: %TRUE if this is a write to the sysctl file
2679 * @buffer: the user buffer
2680 * @lenp: the size of the user buffer
2681 * @ppos: file position
2682 *
2683 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2684 * values from/to the user buffer, treated as an ASCII string.
2685 * The values read are assumed to be in seconds, and are converted into
2686 * jiffies.
2687 *
2688 * Returns 0 on success.
2689 */
2690 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2691 void __user *buffer, size_t *lenp, loff_t *ppos)
2692 {
2693 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2694 do_proc_dointvec_jiffies_conv,NULL);
2695 }
2696
2697 /**
2698 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2699 * @table: the sysctl table
2700 * @write: %TRUE if this is a write to the sysctl file
2701 * @buffer: the user buffer
2702 * @lenp: the size of the user buffer
2703 * @ppos: pointer to the file position
2704 *
2705 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2706 * values from/to the user buffer, treated as an ASCII string.
2707 * The values read are assumed to be in 1/USER_HZ seconds, and
2708 * are converted into jiffies.
2709 *
2710 * Returns 0 on success.
2711 */
2712 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2713 void __user *buffer, size_t *lenp, loff_t *ppos)
2714 {
2715 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2716 do_proc_dointvec_userhz_jiffies_conv,NULL);
2717 }
2718
2719 /**
2720 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2721 * @table: the sysctl table
2722 * @write: %TRUE if this is a write to the sysctl file
2723 * @buffer: the user buffer
2724 * @lenp: the size of the user buffer
2725 * @ppos: file position
2726 * @ppos: the current position in the file
2727 *
2728 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2729 * values from/to the user buffer, treated as an ASCII string.
2730 * The values read are assumed to be in 1/1000 seconds, and
2731 * are converted into jiffies.
2732 *
2733 * Returns 0 on success.
2734 */
2735 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2736 void __user *buffer, size_t *lenp, loff_t *ppos)
2737 {
2738 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2739 do_proc_dointvec_ms_jiffies_conv, NULL);
2740 }
2741
2742 static int proc_do_cad_pid(struct ctl_table *table, int write,
2743 void __user *buffer, size_t *lenp, loff_t *ppos)
2744 {
2745 struct pid *new_pid;
2746 pid_t tmp;
2747 int r;
2748
2749 tmp = pid_vnr(cad_pid);
2750
2751 r = __do_proc_dointvec(&tmp, table, write, buffer,
2752 lenp, ppos, NULL, NULL);
2753 if (r || !write)
2754 return r;
2755
2756 new_pid = find_get_pid(tmp);
2757 if (!new_pid)
2758 return -ESRCH;
2759
2760 put_pid(xchg(&cad_pid, new_pid));
2761 return 0;
2762 }
2763
2764 /**
2765 * proc_do_large_bitmap - read/write from/to a large bitmap
2766 * @table: the sysctl table
2767 * @write: %TRUE if this is a write to the sysctl file
2768 * @buffer: the user buffer
2769 * @lenp: the size of the user buffer
2770 * @ppos: file position
2771 *
2772 * The bitmap is stored at table->data and the bitmap length (in bits)
2773 * in table->maxlen.
2774 *
2775 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2776 * large bitmaps may be represented in a compact manner. Writing into
2777 * the file will clear the bitmap then update it with the given input.
2778 *
2779 * Returns 0 on success.
2780 */
2781 int proc_do_large_bitmap(struct ctl_table *table, int write,
2782 void __user *buffer, size_t *lenp, loff_t *ppos)
2783 {
2784 int err = 0;
2785 bool first = 1;
2786 size_t left = *lenp;
2787 unsigned long bitmap_len = table->maxlen;
2788 unsigned long *bitmap = *(unsigned long **) table->data;
2789 unsigned long *tmp_bitmap = NULL;
2790 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2791
2792 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2793 *lenp = 0;
2794 return 0;
2795 }
2796
2797 if (write) {
2798 char *kbuf, *p;
2799
2800 if (left > PAGE_SIZE - 1)
2801 left = PAGE_SIZE - 1;
2802
2803 p = kbuf = memdup_user_nul(buffer, left);
2804 if (IS_ERR(kbuf))
2805 return PTR_ERR(kbuf);
2806
2807 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2808 GFP_KERNEL);
2809 if (!tmp_bitmap) {
2810 kfree(kbuf);
2811 return -ENOMEM;
2812 }
2813 proc_skip_char(&p, &left, '\n');
2814 while (!err && left) {
2815 unsigned long val_a, val_b;
2816 bool neg;
2817
2818 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2819 sizeof(tr_a), &c);
2820 if (err)
2821 break;
2822 if (val_a >= bitmap_len || neg) {
2823 err = -EINVAL;
2824 break;
2825 }
2826
2827 val_b = val_a;
2828 if (left) {
2829 p++;
2830 left--;
2831 }
2832
2833 if (c == '-') {
2834 err = proc_get_long(&p, &left, &val_b,
2835 &neg, tr_b, sizeof(tr_b),
2836 &c);
2837 if (err)
2838 break;
2839 if (val_b >= bitmap_len || neg ||
2840 val_a > val_b) {
2841 err = -EINVAL;
2842 break;
2843 }
2844 if (left) {
2845 p++;
2846 left--;
2847 }
2848 }
2849
2850 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2851 first = 0;
2852 proc_skip_char(&p, &left, '\n');
2853 }
2854 kfree(kbuf);
2855 } else {
2856 unsigned long bit_a, bit_b = 0;
2857
2858 while (left) {
2859 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2860 if (bit_a >= bitmap_len)
2861 break;
2862 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2863 bit_a + 1) - 1;
2864
2865 if (!first) {
2866 err = proc_put_char(&buffer, &left, ',');
2867 if (err)
2868 break;
2869 }
2870 err = proc_put_long(&buffer, &left, bit_a, false);
2871 if (err)
2872 break;
2873 if (bit_a != bit_b) {
2874 err = proc_put_char(&buffer, &left, '-');
2875 if (err)
2876 break;
2877 err = proc_put_long(&buffer, &left, bit_b, false);
2878 if (err)
2879 break;
2880 }
2881
2882 first = 0; bit_b++;
2883 }
2884 if (!err)
2885 err = proc_put_char(&buffer, &left, '\n');
2886 }
2887
2888 if (!err) {
2889 if (write) {
2890 if (*ppos)
2891 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2892 else
2893 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2894 }
2895 kfree(tmp_bitmap);
2896 *lenp -= left;
2897 *ppos += *lenp;
2898 return 0;
2899 } else {
2900 kfree(tmp_bitmap);
2901 return err;
2902 }
2903 }
2904
2905 #else /* CONFIG_PROC_SYSCTL */
2906
2907 int proc_dostring(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(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_douintvec(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_dointvec_minmax(struct ctl_table *table, int write,
2926 void __user *buffer, size_t *lenp, loff_t *ppos)
2927 {
2928 return -ENOSYS;
2929 }
2930
2931 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2932 void __user *buffer, size_t *lenp, loff_t *ppos)
2933 {
2934 return -ENOSYS;
2935 }
2936
2937 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2938 void __user *buffer, size_t *lenp, loff_t *ppos)
2939 {
2940 return -ENOSYS;
2941 }
2942
2943 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2944 void __user *buffer, size_t *lenp, loff_t *ppos)
2945 {
2946 return -ENOSYS;
2947 }
2948
2949 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2950 void __user *buffer, size_t *lenp, loff_t *ppos)
2951 {
2952 return -ENOSYS;
2953 }
2954
2955 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2956 void __user *buffer,
2957 size_t *lenp, loff_t *ppos)
2958 {
2959 return -ENOSYS;
2960 }
2961
2962
2963 #endif /* CONFIG_PROC_SYSCTL */
2964
2965 /*
2966 * No sense putting this after each symbol definition, twice,
2967 * exception granted :-)
2968 */
2969 EXPORT_SYMBOL(proc_dointvec);
2970 EXPORT_SYMBOL(proc_douintvec);
2971 EXPORT_SYMBOL(proc_dointvec_jiffies);
2972 EXPORT_SYMBOL(proc_dointvec_minmax);
2973 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2974 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2975 EXPORT_SYMBOL(proc_dostring);
2976 EXPORT_SYMBOL(proc_doulongvec_minmax);
2977 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux with added FPC-III support