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fs: move struct kiocb to fs.h
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
35 #include <linux/fs.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67
68 #include <asm/uaccess.h>
69 #include <asm/processor.h>
70
71 #ifdef CONFIG_X86
72 #include <asm/nmi.h>
73 #include <asm/stacktrace.h>
74 #include <asm/io.h>
75 #endif
76 #ifdef CONFIG_SPARC
77 #include <asm/setup.h>
78 #endif
79 #ifdef CONFIG_BSD_PROCESS_ACCT
80 #include <linux/acct.h>
81 #endif
82 #ifdef CONFIG_RT_MUTEXES
83 #include <linux/rtmutex.h>
84 #endif
85 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
86 #include <linux/lockdep.h>
87 #endif
88 #ifdef CONFIG_CHR_DEV_SG
89 #include <scsi/sg.h>
90 #endif
91
92 #ifdef CONFIG_LOCKUP_DETECTOR
93 #include <linux/nmi.h>
94 #endif
95
96
97 #if defined(CONFIG_SYSCTL)
98
99 /* External variables not in a header file. */
100 extern int max_threads;
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 compat_log;
111 extern int latencytop_enabled;
112 extern 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 #ifdef CONFIG_PRINTK
131 static int ten_thousand = 10000;
132 #endif
133
134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136
137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138 static int maxolduid = 65535;
139 static int minolduid;
140
141 static int ngroups_max = NGROUPS_MAX;
142 static const int cap_last_cap = CAP_LAST_CAP;
143
144 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
145 #ifdef CONFIG_DETECT_HUNG_TASK
146 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
147 #endif
148
149 #ifdef CONFIG_INOTIFY_USER
150 #include <linux/inotify.h>
151 #endif
152 #ifdef CONFIG_SPARC
153 #endif
154
155 #ifdef __hppa__
156 extern int pwrsw_enabled;
157 #endif
158
159 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
160 extern int unaligned_enabled;
161 #endif
162
163 #ifdef CONFIG_IA64
164 extern int unaligned_dump_stack;
165 #endif
166
167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
168 extern int no_unaligned_warning;
169 #endif
170
171 #ifdef CONFIG_PROC_SYSCTL
172
173 #define SYSCTL_WRITES_LEGACY -1
174 #define SYSCTL_WRITES_WARN 0
175 #define SYSCTL_WRITES_STRICT 1
176
177 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
178
179 static int proc_do_cad_pid(struct ctl_table *table, int write,
180 void __user *buffer, size_t *lenp, loff_t *ppos);
181 static int proc_taint(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 #endif
184
185 #ifdef CONFIG_PRINTK
186 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
187 void __user *buffer, size_t *lenp, loff_t *ppos);
188 #endif
189
190 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos);
192 #ifdef CONFIG_COREDUMP
193 static int proc_dostring_coredump(struct ctl_table *table, int write,
194 void __user *buffer, size_t *lenp, loff_t *ppos);
195 #endif
196
197 #ifdef CONFIG_MAGIC_SYSRQ
198 /* Note: sysrq code uses it's own private copy */
199 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
200
201 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
202 void __user *buffer, size_t *lenp,
203 loff_t *ppos)
204 {
205 int error;
206
207 error = proc_dointvec(table, write, buffer, lenp, ppos);
208 if (error)
209 return error;
210
211 if (write)
212 sysrq_toggle_support(__sysrq_enabled);
213
214 return 0;
215 }
216
217 #endif
218
219 static struct ctl_table kern_table[];
220 static struct ctl_table vm_table[];
221 static struct ctl_table fs_table[];
222 static struct ctl_table debug_table[];
223 static struct ctl_table dev_table[];
224 extern struct ctl_table random_table[];
225 #ifdef CONFIG_EPOLL
226 extern struct ctl_table epoll_table[];
227 #endif
228
229 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
230 int sysctl_legacy_va_layout;
231 #endif
232
233 /* The default sysctl tables: */
234
235 static struct ctl_table sysctl_base_table[] = {
236 {
237 .procname = "kernel",
238 .mode = 0555,
239 .child = kern_table,
240 },
241 {
242 .procname = "vm",
243 .mode = 0555,
244 .child = vm_table,
245 },
246 {
247 .procname = "fs",
248 .mode = 0555,
249 .child = fs_table,
250 },
251 {
252 .procname = "debug",
253 .mode = 0555,
254 .child = debug_table,
255 },
256 {
257 .procname = "dev",
258 .mode = 0555,
259 .child = dev_table,
260 },
261 { }
262 };
263
264 #ifdef CONFIG_SCHED_DEBUG
265 static int min_sched_granularity_ns = 100000; /* 100 usecs */
266 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
267 static int min_wakeup_granularity_ns; /* 0 usecs */
268 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
269 #ifdef CONFIG_SMP
270 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
271 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
272 #endif /* CONFIG_SMP */
273 #endif /* CONFIG_SCHED_DEBUG */
274
275 #ifdef CONFIG_COMPACTION
276 static int min_extfrag_threshold;
277 static int max_extfrag_threshold = 1000;
278 #endif
279
280 static struct ctl_table kern_table[] = {
281 {
282 .procname = "sched_child_runs_first",
283 .data = &sysctl_sched_child_runs_first,
284 .maxlen = sizeof(unsigned int),
285 .mode = 0644,
286 .proc_handler = proc_dointvec,
287 },
288 #ifdef CONFIG_SCHED_DEBUG
289 {
290 .procname = "sched_min_granularity_ns",
291 .data = &sysctl_sched_min_granularity,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = sched_proc_update_handler,
295 .extra1 = &min_sched_granularity_ns,
296 .extra2 = &max_sched_granularity_ns,
297 },
298 {
299 .procname = "sched_latency_ns",
300 .data = &sysctl_sched_latency,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_sched_granularity_ns,
305 .extra2 = &max_sched_granularity_ns,
306 },
307 {
308 .procname = "sched_wakeup_granularity_ns",
309 .data = &sysctl_sched_wakeup_granularity,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = sched_proc_update_handler,
313 .extra1 = &min_wakeup_granularity_ns,
314 .extra2 = &max_wakeup_granularity_ns,
315 },
316 #ifdef CONFIG_SMP
317 {
318 .procname = "sched_tunable_scaling",
319 .data = &sysctl_sched_tunable_scaling,
320 .maxlen = sizeof(enum sched_tunable_scaling),
321 .mode = 0644,
322 .proc_handler = sched_proc_update_handler,
323 .extra1 = &min_sched_tunable_scaling,
324 .extra2 = &max_sched_tunable_scaling,
325 },
326 {
327 .procname = "sched_migration_cost_ns",
328 .data = &sysctl_sched_migration_cost,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = proc_dointvec,
332 },
333 {
334 .procname = "sched_nr_migrate",
335 .data = &sysctl_sched_nr_migrate,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "sched_time_avg_ms",
342 .data = &sysctl_sched_time_avg,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
347 {
348 .procname = "sched_shares_window_ns",
349 .data = &sysctl_sched_shares_window,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec,
353 },
354 {
355 .procname = "timer_migration",
356 .data = &sysctl_timer_migration,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec_minmax,
360 .extra1 = &zero,
361 .extra2 = &one,
362 },
363 #endif /* CONFIG_SMP */
364 #ifdef CONFIG_NUMA_BALANCING
365 {
366 .procname = "numa_balancing_scan_delay_ms",
367 .data = &sysctl_numa_balancing_scan_delay,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
370 .proc_handler = proc_dointvec,
371 },
372 {
373 .procname = "numa_balancing_scan_period_min_ms",
374 .data = &sysctl_numa_balancing_scan_period_min,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec,
378 },
379 {
380 .procname = "numa_balancing_scan_period_max_ms",
381 .data = &sysctl_numa_balancing_scan_period_max,
382 .maxlen = sizeof(unsigned int),
383 .mode = 0644,
384 .proc_handler = proc_dointvec,
385 },
386 {
387 .procname = "numa_balancing_scan_size_mb",
388 .data = &sysctl_numa_balancing_scan_size,
389 .maxlen = sizeof(unsigned int),
390 .mode = 0644,
391 .proc_handler = proc_dointvec_minmax,
392 .extra1 = &one,
393 },
394 {
395 .procname = "numa_balancing",
396 .data = NULL, /* filled in by handler */
397 .maxlen = sizeof(unsigned int),
398 .mode = 0644,
399 .proc_handler = sysctl_numa_balancing,
400 .extra1 = &zero,
401 .extra2 = &one,
402 },
403 #endif /* CONFIG_NUMA_BALANCING */
404 #endif /* CONFIG_SCHED_DEBUG */
405 {
406 .procname = "sched_rt_period_us",
407 .data = &sysctl_sched_rt_period,
408 .maxlen = sizeof(unsigned int),
409 .mode = 0644,
410 .proc_handler = sched_rt_handler,
411 },
412 {
413 .procname = "sched_rt_runtime_us",
414 .data = &sysctl_sched_rt_runtime,
415 .maxlen = sizeof(int),
416 .mode = 0644,
417 .proc_handler = sched_rt_handler,
418 },
419 {
420 .procname = "sched_rr_timeslice_ms",
421 .data = &sched_rr_timeslice,
422 .maxlen = sizeof(int),
423 .mode = 0644,
424 .proc_handler = sched_rr_handler,
425 },
426 #ifdef CONFIG_SCHED_AUTOGROUP
427 {
428 .procname = "sched_autogroup_enabled",
429 .data = &sysctl_sched_autogroup_enabled,
430 .maxlen = sizeof(unsigned int),
431 .mode = 0644,
432 .proc_handler = proc_dointvec_minmax,
433 .extra1 = &zero,
434 .extra2 = &one,
435 },
436 #endif
437 #ifdef CONFIG_CFS_BANDWIDTH
438 {
439 .procname = "sched_cfs_bandwidth_slice_us",
440 .data = &sysctl_sched_cfs_bandwidth_slice,
441 .maxlen = sizeof(unsigned int),
442 .mode = 0644,
443 .proc_handler = proc_dointvec_minmax,
444 .extra1 = &one,
445 },
446 #endif
447 #ifdef CONFIG_PROVE_LOCKING
448 {
449 .procname = "prove_locking",
450 .data = &prove_locking,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec,
454 },
455 #endif
456 #ifdef CONFIG_LOCK_STAT
457 {
458 .procname = "lock_stat",
459 .data = &lock_stat,
460 .maxlen = sizeof(int),
461 .mode = 0644,
462 .proc_handler = proc_dointvec,
463 },
464 #endif
465 {
466 .procname = "panic",
467 .data = &panic_timeout,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec,
471 },
472 #ifdef CONFIG_COREDUMP
473 {
474 .procname = "core_uses_pid",
475 .data = &core_uses_pid,
476 .maxlen = sizeof(int),
477 .mode = 0644,
478 .proc_handler = proc_dointvec,
479 },
480 {
481 .procname = "core_pattern",
482 .data = core_pattern,
483 .maxlen = CORENAME_MAX_SIZE,
484 .mode = 0644,
485 .proc_handler = proc_dostring_coredump,
486 },
487 {
488 .procname = "core_pipe_limit",
489 .data = &core_pipe_limit,
490 .maxlen = sizeof(unsigned int),
491 .mode = 0644,
492 .proc_handler = proc_dointvec,
493 },
494 #endif
495 #ifdef CONFIG_PROC_SYSCTL
496 {
497 .procname = "tainted",
498 .maxlen = sizeof(long),
499 .mode = 0644,
500 .proc_handler = proc_taint,
501 },
502 {
503 .procname = "sysctl_writes_strict",
504 .data = &sysctl_writes_strict,
505 .maxlen = sizeof(int),
506 .mode = 0644,
507 .proc_handler = proc_dointvec_minmax,
508 .extra1 = &neg_one,
509 .extra2 = &one,
510 },
511 #endif
512 #ifdef CONFIG_LATENCYTOP
513 {
514 .procname = "latencytop",
515 .data = &latencytop_enabled,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec,
519 },
520 #endif
521 #ifdef CONFIG_BLK_DEV_INITRD
522 {
523 .procname = "real-root-dev",
524 .data = &real_root_dev,
525 .maxlen = sizeof(int),
526 .mode = 0644,
527 .proc_handler = proc_dointvec,
528 },
529 #endif
530 {
531 .procname = "print-fatal-signals",
532 .data = &print_fatal_signals,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec,
536 },
537 #ifdef CONFIG_SPARC
538 {
539 .procname = "reboot-cmd",
540 .data = reboot_command,
541 .maxlen = 256,
542 .mode = 0644,
543 .proc_handler = proc_dostring,
544 },
545 {
546 .procname = "stop-a",
547 .data = &stop_a_enabled,
548 .maxlen = sizeof (int),
549 .mode = 0644,
550 .proc_handler = proc_dointvec,
551 },
552 {
553 .procname = "scons-poweroff",
554 .data = &scons_pwroff,
555 .maxlen = sizeof (int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec,
558 },
559 #endif
560 #ifdef CONFIG_SPARC64
561 {
562 .procname = "tsb-ratio",
563 .data = &sysctl_tsb_ratio,
564 .maxlen = sizeof (int),
565 .mode = 0644,
566 .proc_handler = proc_dointvec,
567 },
568 #endif
569 #ifdef __hppa__
570 {
571 .procname = "soft-power",
572 .data = &pwrsw_enabled,
573 .maxlen = sizeof (int),
574 .mode = 0644,
575 .proc_handler = proc_dointvec,
576 },
577 #endif
578 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
579 {
580 .procname = "unaligned-trap",
581 .data = &unaligned_enabled,
582 .maxlen = sizeof (int),
583 .mode = 0644,
584 .proc_handler = proc_dointvec,
585 },
586 #endif
587 {
588 .procname = "ctrl-alt-del",
589 .data = &C_A_D,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec,
593 },
594 #ifdef CONFIG_FUNCTION_TRACER
595 {
596 .procname = "ftrace_enabled",
597 .data = &ftrace_enabled,
598 .maxlen = sizeof(int),
599 .mode = 0644,
600 .proc_handler = ftrace_enable_sysctl,
601 },
602 #endif
603 #ifdef CONFIG_STACK_TRACER
604 {
605 .procname = "stack_tracer_enabled",
606 .data = &stack_tracer_enabled,
607 .maxlen = sizeof(int),
608 .mode = 0644,
609 .proc_handler = stack_trace_sysctl,
610 },
611 #endif
612 #ifdef CONFIG_TRACING
613 {
614 .procname = "ftrace_dump_on_oops",
615 .data = &ftrace_dump_on_oops,
616 .maxlen = sizeof(int),
617 .mode = 0644,
618 .proc_handler = proc_dointvec,
619 },
620 {
621 .procname = "traceoff_on_warning",
622 .data = &__disable_trace_on_warning,
623 .maxlen = sizeof(__disable_trace_on_warning),
624 .mode = 0644,
625 .proc_handler = proc_dointvec,
626 },
627 {
628 .procname = "tracepoint_printk",
629 .data = &tracepoint_printk,
630 .maxlen = sizeof(tracepoint_printk),
631 .mode = 0644,
632 .proc_handler = proc_dointvec,
633 },
634 #endif
635 #ifdef CONFIG_KEXEC
636 {
637 .procname = "kexec_load_disabled",
638 .data = &kexec_load_disabled,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 /* only handle a transition from default "0" to "1" */
642 .proc_handler = proc_dointvec_minmax,
643 .extra1 = &one,
644 .extra2 = &one,
645 },
646 #endif
647 #ifdef CONFIG_MODULES
648 {
649 .procname = "modprobe",
650 .data = &modprobe_path,
651 .maxlen = KMOD_PATH_LEN,
652 .mode = 0644,
653 .proc_handler = proc_dostring,
654 },
655 {
656 .procname = "modules_disabled",
657 .data = &modules_disabled,
658 .maxlen = sizeof(int),
659 .mode = 0644,
660 /* only handle a transition from default "0" to "1" */
661 .proc_handler = proc_dointvec_minmax,
662 .extra1 = &one,
663 .extra2 = &one,
664 },
665 #endif
666 #ifdef CONFIG_UEVENT_HELPER
667 {
668 .procname = "hotplug",
669 .data = &uevent_helper,
670 .maxlen = UEVENT_HELPER_PATH_LEN,
671 .mode = 0644,
672 .proc_handler = proc_dostring,
673 },
674 #endif
675 #ifdef CONFIG_CHR_DEV_SG
676 {
677 .procname = "sg-big-buff",
678 .data = &sg_big_buff,
679 .maxlen = sizeof (int),
680 .mode = 0444,
681 .proc_handler = proc_dointvec,
682 },
683 #endif
684 #ifdef CONFIG_BSD_PROCESS_ACCT
685 {
686 .procname = "acct",
687 .data = &acct_parm,
688 .maxlen = 3*sizeof(int),
689 .mode = 0644,
690 .proc_handler = proc_dointvec,
691 },
692 #endif
693 #ifdef CONFIG_MAGIC_SYSRQ
694 {
695 .procname = "sysrq",
696 .data = &__sysrq_enabled,
697 .maxlen = sizeof (int),
698 .mode = 0644,
699 .proc_handler = sysrq_sysctl_handler,
700 },
701 #endif
702 #ifdef CONFIG_PROC_SYSCTL
703 {
704 .procname = "cad_pid",
705 .data = NULL,
706 .maxlen = sizeof (int),
707 .mode = 0600,
708 .proc_handler = proc_do_cad_pid,
709 },
710 #endif
711 {
712 .procname = "threads-max",
713 .data = &max_threads,
714 .maxlen = sizeof(int),
715 .mode = 0644,
716 .proc_handler = proc_dointvec,
717 },
718 {
719 .procname = "random",
720 .mode = 0555,
721 .child = random_table,
722 },
723 {
724 .procname = "usermodehelper",
725 .mode = 0555,
726 .child = usermodehelper_table,
727 },
728 {
729 .procname = "overflowuid",
730 .data = &overflowuid,
731 .maxlen = sizeof(int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec_minmax,
734 .extra1 = &minolduid,
735 .extra2 = &maxolduid,
736 },
737 {
738 .procname = "overflowgid",
739 .data = &overflowgid,
740 .maxlen = sizeof(int),
741 .mode = 0644,
742 .proc_handler = proc_dointvec_minmax,
743 .extra1 = &minolduid,
744 .extra2 = &maxolduid,
745 },
746 #ifdef CONFIG_S390
747 #ifdef CONFIG_MATHEMU
748 {
749 .procname = "ieee_emulation_warnings",
750 .data = &sysctl_ieee_emulation_warnings,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = proc_dointvec,
754 },
755 #endif
756 {
757 .procname = "userprocess_debug",
758 .data = &show_unhandled_signals,
759 .maxlen = sizeof(int),
760 .mode = 0644,
761 .proc_handler = proc_dointvec,
762 },
763 #endif
764 {
765 .procname = "pid_max",
766 .data = &pid_max,
767 .maxlen = sizeof (int),
768 .mode = 0644,
769 .proc_handler = proc_dointvec_minmax,
770 .extra1 = &pid_max_min,
771 .extra2 = &pid_max_max,
772 },
773 {
774 .procname = "panic_on_oops",
775 .data = &panic_on_oops,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec,
779 },
780 #if defined CONFIG_PRINTK
781 {
782 .procname = "printk",
783 .data = &console_loglevel,
784 .maxlen = 4*sizeof(int),
785 .mode = 0644,
786 .proc_handler = proc_dointvec,
787 },
788 {
789 .procname = "printk_ratelimit",
790 .data = &printk_ratelimit_state.interval,
791 .maxlen = sizeof(int),
792 .mode = 0644,
793 .proc_handler = proc_dointvec_jiffies,
794 },
795 {
796 .procname = "printk_ratelimit_burst",
797 .data = &printk_ratelimit_state.burst,
798 .maxlen = sizeof(int),
799 .mode = 0644,
800 .proc_handler = proc_dointvec,
801 },
802 {
803 .procname = "printk_delay",
804 .data = &printk_delay_msec,
805 .maxlen = sizeof(int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec_minmax,
808 .extra1 = &zero,
809 .extra2 = &ten_thousand,
810 },
811 {
812 .procname = "dmesg_restrict",
813 .data = &dmesg_restrict,
814 .maxlen = sizeof(int),
815 .mode = 0644,
816 .proc_handler = proc_dointvec_minmax_sysadmin,
817 .extra1 = &zero,
818 .extra2 = &one,
819 },
820 {
821 .procname = "kptr_restrict",
822 .data = &kptr_restrict,
823 .maxlen = sizeof(int),
824 .mode = 0644,
825 .proc_handler = proc_dointvec_minmax_sysadmin,
826 .extra1 = &zero,
827 .extra2 = &two,
828 },
829 #endif
830 {
831 .procname = "ngroups_max",
832 .data = &ngroups_max,
833 .maxlen = sizeof (int),
834 .mode = 0444,
835 .proc_handler = proc_dointvec,
836 },
837 {
838 .procname = "cap_last_cap",
839 .data = (void *)&cap_last_cap,
840 .maxlen = sizeof(int),
841 .mode = 0444,
842 .proc_handler = proc_dointvec,
843 },
844 #if defined(CONFIG_LOCKUP_DETECTOR)
845 {
846 .procname = "watchdog",
847 .data = &watchdog_user_enabled,
848 .maxlen = sizeof (int),
849 .mode = 0644,
850 .proc_handler = proc_dowatchdog,
851 .extra1 = &zero,
852 .extra2 = &one,
853 },
854 {
855 .procname = "watchdog_thresh",
856 .data = &watchdog_thresh,
857 .maxlen = sizeof(int),
858 .mode = 0644,
859 .proc_handler = proc_dowatchdog,
860 .extra1 = &zero,
861 .extra2 = &sixty,
862 },
863 {
864 .procname = "softlockup_panic",
865 .data = &softlockup_panic,
866 .maxlen = sizeof(int),
867 .mode = 0644,
868 .proc_handler = proc_dointvec_minmax,
869 .extra1 = &zero,
870 .extra2 = &one,
871 },
872 #ifdef CONFIG_SMP
873 {
874 .procname = "softlockup_all_cpu_backtrace",
875 .data = &sysctl_softlockup_all_cpu_backtrace,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = proc_dointvec_minmax,
879 .extra1 = &zero,
880 .extra2 = &one,
881 },
882 #endif /* CONFIG_SMP */
883 {
884 .procname = "nmi_watchdog",
885 .data = &watchdog_user_enabled,
886 .maxlen = sizeof (int),
887 .mode = 0644,
888 .proc_handler = proc_dowatchdog,
889 .extra1 = &zero,
890 .extra2 = &one,
891 },
892 #endif
893 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
894 {
895 .procname = "unknown_nmi_panic",
896 .data = &unknown_nmi_panic,
897 .maxlen = sizeof (int),
898 .mode = 0644,
899 .proc_handler = proc_dointvec,
900 },
901 #endif
902 #if defined(CONFIG_X86)
903 {
904 .procname = "panic_on_unrecovered_nmi",
905 .data = &panic_on_unrecovered_nmi,
906 .maxlen = sizeof(int),
907 .mode = 0644,
908 .proc_handler = proc_dointvec,
909 },
910 {
911 .procname = "panic_on_io_nmi",
912 .data = &panic_on_io_nmi,
913 .maxlen = sizeof(int),
914 .mode = 0644,
915 .proc_handler = proc_dointvec,
916 },
917 #ifdef CONFIG_DEBUG_STACKOVERFLOW
918 {
919 .procname = "panic_on_stackoverflow",
920 .data = &sysctl_panic_on_stackoverflow,
921 .maxlen = sizeof(int),
922 .mode = 0644,
923 .proc_handler = proc_dointvec,
924 },
925 #endif
926 {
927 .procname = "bootloader_type",
928 .data = &bootloader_type,
929 .maxlen = sizeof (int),
930 .mode = 0444,
931 .proc_handler = proc_dointvec,
932 },
933 {
934 .procname = "bootloader_version",
935 .data = &bootloader_version,
936 .maxlen = sizeof (int),
937 .mode = 0444,
938 .proc_handler = proc_dointvec,
939 },
940 {
941 .procname = "kstack_depth_to_print",
942 .data = &kstack_depth_to_print,
943 .maxlen = sizeof(int),
944 .mode = 0644,
945 .proc_handler = proc_dointvec,
946 },
947 {
948 .procname = "io_delay_type",
949 .data = &io_delay_type,
950 .maxlen = sizeof(int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec,
953 },
954 #endif
955 #if defined(CONFIG_MMU)
956 {
957 .procname = "randomize_va_space",
958 .data = &randomize_va_space,
959 .maxlen = sizeof(int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec,
962 },
963 #endif
964 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
965 {
966 .procname = "spin_retry",
967 .data = &spin_retry,
968 .maxlen = sizeof (int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec,
971 },
972 #endif
973 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
974 {
975 .procname = "acpi_video_flags",
976 .data = &acpi_realmode_flags,
977 .maxlen = sizeof (unsigned long),
978 .mode = 0644,
979 .proc_handler = proc_doulongvec_minmax,
980 },
981 #endif
982 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
983 {
984 .procname = "ignore-unaligned-usertrap",
985 .data = &no_unaligned_warning,
986 .maxlen = sizeof (int),
987 .mode = 0644,
988 .proc_handler = proc_dointvec,
989 },
990 #endif
991 #ifdef CONFIG_IA64
992 {
993 .procname = "unaligned-dump-stack",
994 .data = &unaligned_dump_stack,
995 .maxlen = sizeof (int),
996 .mode = 0644,
997 .proc_handler = proc_dointvec,
998 },
999 #endif
1000 #ifdef CONFIG_DETECT_HUNG_TASK
1001 {
1002 .procname = "hung_task_panic",
1003 .data = &sysctl_hung_task_panic,
1004 .maxlen = sizeof(int),
1005 .mode = 0644,
1006 .proc_handler = proc_dointvec_minmax,
1007 .extra1 = &zero,
1008 .extra2 = &one,
1009 },
1010 {
1011 .procname = "hung_task_check_count",
1012 .data = &sysctl_hung_task_check_count,
1013 .maxlen = sizeof(int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec_minmax,
1016 .extra1 = &zero,
1017 },
1018 {
1019 .procname = "hung_task_timeout_secs",
1020 .data = &sysctl_hung_task_timeout_secs,
1021 .maxlen = sizeof(unsigned long),
1022 .mode = 0644,
1023 .proc_handler = proc_dohung_task_timeout_secs,
1024 .extra2 = &hung_task_timeout_max,
1025 },
1026 {
1027 .procname = "hung_task_warnings",
1028 .data = &sysctl_hung_task_warnings,
1029 .maxlen = sizeof(int),
1030 .mode = 0644,
1031 .proc_handler = proc_dointvec_minmax,
1032 .extra1 = &neg_one,
1033 },
1034 #endif
1035 #ifdef CONFIG_COMPAT
1036 {
1037 .procname = "compat-log",
1038 .data = &compat_log,
1039 .maxlen = sizeof (int),
1040 .mode = 0644,
1041 .proc_handler = proc_dointvec,
1042 },
1043 #endif
1044 #ifdef CONFIG_RT_MUTEXES
1045 {
1046 .procname = "max_lock_depth",
1047 .data = &max_lock_depth,
1048 .maxlen = sizeof(int),
1049 .mode = 0644,
1050 .proc_handler = proc_dointvec,
1051 },
1052 #endif
1053 {
1054 .procname = "poweroff_cmd",
1055 .data = &poweroff_cmd,
1056 .maxlen = POWEROFF_CMD_PATH_LEN,
1057 .mode = 0644,
1058 .proc_handler = proc_dostring,
1059 },
1060 #ifdef CONFIG_KEYS
1061 {
1062 .procname = "keys",
1063 .mode = 0555,
1064 .child = key_sysctls,
1065 },
1066 #endif
1067 #ifdef CONFIG_PERF_EVENTS
1068 /*
1069 * User-space scripts rely on the existence of this file
1070 * as a feature check for perf_events being enabled.
1071 *
1072 * So it's an ABI, do not remove!
1073 */
1074 {
1075 .procname = "perf_event_paranoid",
1076 .data = &sysctl_perf_event_paranoid,
1077 .maxlen = sizeof(sysctl_perf_event_paranoid),
1078 .mode = 0644,
1079 .proc_handler = proc_dointvec,
1080 },
1081 {
1082 .procname = "perf_event_mlock_kb",
1083 .data = &sysctl_perf_event_mlock,
1084 .maxlen = sizeof(sysctl_perf_event_mlock),
1085 .mode = 0644,
1086 .proc_handler = proc_dointvec,
1087 },
1088 {
1089 .procname = "perf_event_max_sample_rate",
1090 .data = &sysctl_perf_event_sample_rate,
1091 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1092 .mode = 0644,
1093 .proc_handler = perf_proc_update_handler,
1094 .extra1 = &one,
1095 },
1096 {
1097 .procname = "perf_cpu_time_max_percent",
1098 .data = &sysctl_perf_cpu_time_max_percent,
1099 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1100 .mode = 0644,
1101 .proc_handler = perf_cpu_time_max_percent_handler,
1102 .extra1 = &zero,
1103 .extra2 = &one_hundred,
1104 },
1105 #endif
1106 #ifdef CONFIG_KMEMCHECK
1107 {
1108 .procname = "kmemcheck",
1109 .data = &kmemcheck_enabled,
1110 .maxlen = sizeof(int),
1111 .mode = 0644,
1112 .proc_handler = proc_dointvec,
1113 },
1114 #endif
1115 {
1116 .procname = "panic_on_warn",
1117 .data = &panic_on_warn,
1118 .maxlen = sizeof(int),
1119 .mode = 0644,
1120 .proc_handler = proc_dointvec_minmax,
1121 .extra1 = &zero,
1122 .extra2 = &one,
1123 },
1124 { }
1125 };
1126
1127 static struct ctl_table vm_table[] = {
1128 {
1129 .procname = "overcommit_memory",
1130 .data = &sysctl_overcommit_memory,
1131 .maxlen = sizeof(sysctl_overcommit_memory),
1132 .mode = 0644,
1133 .proc_handler = proc_dointvec_minmax,
1134 .extra1 = &zero,
1135 .extra2 = &two,
1136 },
1137 {
1138 .procname = "panic_on_oom",
1139 .data = &sysctl_panic_on_oom,
1140 .maxlen = sizeof(sysctl_panic_on_oom),
1141 .mode = 0644,
1142 .proc_handler = proc_dointvec_minmax,
1143 .extra1 = &zero,
1144 .extra2 = &two,
1145 },
1146 {
1147 .procname = "oom_kill_allocating_task",
1148 .data = &sysctl_oom_kill_allocating_task,
1149 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1150 .mode = 0644,
1151 .proc_handler = proc_dointvec,
1152 },
1153 {
1154 .procname = "oom_dump_tasks",
1155 .data = &sysctl_oom_dump_tasks,
1156 .maxlen = sizeof(sysctl_oom_dump_tasks),
1157 .mode = 0644,
1158 .proc_handler = proc_dointvec,
1159 },
1160 {
1161 .procname = "overcommit_ratio",
1162 .data = &sysctl_overcommit_ratio,
1163 .maxlen = sizeof(sysctl_overcommit_ratio),
1164 .mode = 0644,
1165 .proc_handler = overcommit_ratio_handler,
1166 },
1167 {
1168 .procname = "overcommit_kbytes",
1169 .data = &sysctl_overcommit_kbytes,
1170 .maxlen = sizeof(sysctl_overcommit_kbytes),
1171 .mode = 0644,
1172 .proc_handler = overcommit_kbytes_handler,
1173 },
1174 {
1175 .procname = "page-cluster",
1176 .data = &page_cluster,
1177 .maxlen = sizeof(int),
1178 .mode = 0644,
1179 .proc_handler = proc_dointvec_minmax,
1180 .extra1 = &zero,
1181 },
1182 {
1183 .procname = "dirty_background_ratio",
1184 .data = &dirty_background_ratio,
1185 .maxlen = sizeof(dirty_background_ratio),
1186 .mode = 0644,
1187 .proc_handler = dirty_background_ratio_handler,
1188 .extra1 = &zero,
1189 .extra2 = &one_hundred,
1190 },
1191 {
1192 .procname = "dirty_background_bytes",
1193 .data = &dirty_background_bytes,
1194 .maxlen = sizeof(dirty_background_bytes),
1195 .mode = 0644,
1196 .proc_handler = dirty_background_bytes_handler,
1197 .extra1 = &one_ul,
1198 },
1199 {
1200 .procname = "dirty_ratio",
1201 .data = &vm_dirty_ratio,
1202 .maxlen = sizeof(vm_dirty_ratio),
1203 .mode = 0644,
1204 .proc_handler = dirty_ratio_handler,
1205 .extra1 = &zero,
1206 .extra2 = &one_hundred,
1207 },
1208 {
1209 .procname = "dirty_bytes",
1210 .data = &vm_dirty_bytes,
1211 .maxlen = sizeof(vm_dirty_bytes),
1212 .mode = 0644,
1213 .proc_handler = dirty_bytes_handler,
1214 .extra1 = &dirty_bytes_min,
1215 },
1216 {
1217 .procname = "dirty_writeback_centisecs",
1218 .data = &dirty_writeback_interval,
1219 .maxlen = sizeof(dirty_writeback_interval),
1220 .mode = 0644,
1221 .proc_handler = dirty_writeback_centisecs_handler,
1222 },
1223 {
1224 .procname = "dirty_expire_centisecs",
1225 .data = &dirty_expire_interval,
1226 .maxlen = sizeof(dirty_expire_interval),
1227 .mode = 0644,
1228 .proc_handler = proc_dointvec_minmax,
1229 .extra1 = &zero,
1230 },
1231 {
1232 .procname = "nr_pdflush_threads",
1233 .mode = 0444 /* read-only */,
1234 .proc_handler = pdflush_proc_obsolete,
1235 },
1236 {
1237 .procname = "swappiness",
1238 .data = &vm_swappiness,
1239 .maxlen = sizeof(vm_swappiness),
1240 .mode = 0644,
1241 .proc_handler = proc_dointvec_minmax,
1242 .extra1 = &zero,
1243 .extra2 = &one_hundred,
1244 },
1245 #ifdef CONFIG_HUGETLB_PAGE
1246 {
1247 .procname = "nr_hugepages",
1248 .data = NULL,
1249 .maxlen = sizeof(unsigned long),
1250 .mode = 0644,
1251 .proc_handler = hugetlb_sysctl_handler,
1252 },
1253 #ifdef CONFIG_NUMA
1254 {
1255 .procname = "nr_hugepages_mempolicy",
1256 .data = NULL,
1257 .maxlen = sizeof(unsigned long),
1258 .mode = 0644,
1259 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1260 },
1261 #endif
1262 {
1263 .procname = "hugetlb_shm_group",
1264 .data = &sysctl_hugetlb_shm_group,
1265 .maxlen = sizeof(gid_t),
1266 .mode = 0644,
1267 .proc_handler = proc_dointvec,
1268 },
1269 {
1270 .procname = "hugepages_treat_as_movable",
1271 .data = &hugepages_treat_as_movable,
1272 .maxlen = sizeof(int),
1273 .mode = 0644,
1274 .proc_handler = proc_dointvec,
1275 },
1276 {
1277 .procname = "nr_overcommit_hugepages",
1278 .data = NULL,
1279 .maxlen = sizeof(unsigned long),
1280 .mode = 0644,
1281 .proc_handler = hugetlb_overcommit_handler,
1282 },
1283 #endif
1284 {
1285 .procname = "lowmem_reserve_ratio",
1286 .data = &sysctl_lowmem_reserve_ratio,
1287 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1288 .mode = 0644,
1289 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1290 },
1291 {
1292 .procname = "drop_caches",
1293 .data = &sysctl_drop_caches,
1294 .maxlen = sizeof(int),
1295 .mode = 0644,
1296 .proc_handler = drop_caches_sysctl_handler,
1297 .extra1 = &one,
1298 .extra2 = &four,
1299 },
1300 #ifdef CONFIG_COMPACTION
1301 {
1302 .procname = "compact_memory",
1303 .data = &sysctl_compact_memory,
1304 .maxlen = sizeof(int),
1305 .mode = 0200,
1306 .proc_handler = sysctl_compaction_handler,
1307 },
1308 {
1309 .procname = "extfrag_threshold",
1310 .data = &sysctl_extfrag_threshold,
1311 .maxlen = sizeof(int),
1312 .mode = 0644,
1313 .proc_handler = sysctl_extfrag_handler,
1314 .extra1 = &min_extfrag_threshold,
1315 .extra2 = &max_extfrag_threshold,
1316 },
1317
1318 #endif /* CONFIG_COMPACTION */
1319 {
1320 .procname = "min_free_kbytes",
1321 .data = &min_free_kbytes,
1322 .maxlen = sizeof(min_free_kbytes),
1323 .mode = 0644,
1324 .proc_handler = min_free_kbytes_sysctl_handler,
1325 .extra1 = &zero,
1326 },
1327 {
1328 .procname = "percpu_pagelist_fraction",
1329 .data = &percpu_pagelist_fraction,
1330 .maxlen = sizeof(percpu_pagelist_fraction),
1331 .mode = 0644,
1332 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1333 .extra1 = &zero,
1334 },
1335 #ifdef CONFIG_MMU
1336 {
1337 .procname = "max_map_count",
1338 .data = &sysctl_max_map_count,
1339 .maxlen = sizeof(sysctl_max_map_count),
1340 .mode = 0644,
1341 .proc_handler = proc_dointvec_minmax,
1342 .extra1 = &zero,
1343 },
1344 #else
1345 {
1346 .procname = "nr_trim_pages",
1347 .data = &sysctl_nr_trim_pages,
1348 .maxlen = sizeof(sysctl_nr_trim_pages),
1349 .mode = 0644,
1350 .proc_handler = proc_dointvec_minmax,
1351 .extra1 = &zero,
1352 },
1353 #endif
1354 {
1355 .procname = "laptop_mode",
1356 .data = &laptop_mode,
1357 .maxlen = sizeof(laptop_mode),
1358 .mode = 0644,
1359 .proc_handler = proc_dointvec_jiffies,
1360 },
1361 {
1362 .procname = "block_dump",
1363 .data = &block_dump,
1364 .maxlen = sizeof(block_dump),
1365 .mode = 0644,
1366 .proc_handler = proc_dointvec,
1367 .extra1 = &zero,
1368 },
1369 {
1370 .procname = "vfs_cache_pressure",
1371 .data = &sysctl_vfs_cache_pressure,
1372 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1373 .mode = 0644,
1374 .proc_handler = proc_dointvec,
1375 .extra1 = &zero,
1376 },
1377 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1378 {
1379 .procname = "legacy_va_layout",
1380 .data = &sysctl_legacy_va_layout,
1381 .maxlen = sizeof(sysctl_legacy_va_layout),
1382 .mode = 0644,
1383 .proc_handler = proc_dointvec,
1384 .extra1 = &zero,
1385 },
1386 #endif
1387 #ifdef CONFIG_NUMA
1388 {
1389 .procname = "zone_reclaim_mode",
1390 .data = &zone_reclaim_mode,
1391 .maxlen = sizeof(zone_reclaim_mode),
1392 .mode = 0644,
1393 .proc_handler = proc_dointvec,
1394 .extra1 = &zero,
1395 },
1396 {
1397 .procname = "min_unmapped_ratio",
1398 .data = &sysctl_min_unmapped_ratio,
1399 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1400 .mode = 0644,
1401 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1402 .extra1 = &zero,
1403 .extra2 = &one_hundred,
1404 },
1405 {
1406 .procname = "min_slab_ratio",
1407 .data = &sysctl_min_slab_ratio,
1408 .maxlen = sizeof(sysctl_min_slab_ratio),
1409 .mode = 0644,
1410 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1411 .extra1 = &zero,
1412 .extra2 = &one_hundred,
1413 },
1414 #endif
1415 #ifdef CONFIG_SMP
1416 {
1417 .procname = "stat_interval",
1418 .data = &sysctl_stat_interval,
1419 .maxlen = sizeof(sysctl_stat_interval),
1420 .mode = 0644,
1421 .proc_handler = proc_dointvec_jiffies,
1422 },
1423 #endif
1424 #ifdef CONFIG_MMU
1425 {
1426 .procname = "mmap_min_addr",
1427 .data = &dac_mmap_min_addr,
1428 .maxlen = sizeof(unsigned long),
1429 .mode = 0644,
1430 .proc_handler = mmap_min_addr_handler,
1431 },
1432 #endif
1433 #ifdef CONFIG_NUMA
1434 {
1435 .procname = "numa_zonelist_order",
1436 .data = &numa_zonelist_order,
1437 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1438 .mode = 0644,
1439 .proc_handler = numa_zonelist_order_handler,
1440 },
1441 #endif
1442 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1443 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1444 {
1445 .procname = "vdso_enabled",
1446 #ifdef CONFIG_X86_32
1447 .data = &vdso32_enabled,
1448 .maxlen = sizeof(vdso32_enabled),
1449 #else
1450 .data = &vdso_enabled,
1451 .maxlen = sizeof(vdso_enabled),
1452 #endif
1453 .mode = 0644,
1454 .proc_handler = proc_dointvec,
1455 .extra1 = &zero,
1456 },
1457 #endif
1458 #ifdef CONFIG_HIGHMEM
1459 {
1460 .procname = "highmem_is_dirtyable",
1461 .data = &vm_highmem_is_dirtyable,
1462 .maxlen = sizeof(vm_highmem_is_dirtyable),
1463 .mode = 0644,
1464 .proc_handler = proc_dointvec_minmax,
1465 .extra1 = &zero,
1466 .extra2 = &one,
1467 },
1468 #endif
1469 #ifdef CONFIG_MEMORY_FAILURE
1470 {
1471 .procname = "memory_failure_early_kill",
1472 .data = &sysctl_memory_failure_early_kill,
1473 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1474 .mode = 0644,
1475 .proc_handler = proc_dointvec_minmax,
1476 .extra1 = &zero,
1477 .extra2 = &one,
1478 },
1479 {
1480 .procname = "memory_failure_recovery",
1481 .data = &sysctl_memory_failure_recovery,
1482 .maxlen = sizeof(sysctl_memory_failure_recovery),
1483 .mode = 0644,
1484 .proc_handler = proc_dointvec_minmax,
1485 .extra1 = &zero,
1486 .extra2 = &one,
1487 },
1488 #endif
1489 {
1490 .procname = "user_reserve_kbytes",
1491 .data = &sysctl_user_reserve_kbytes,
1492 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1493 .mode = 0644,
1494 .proc_handler = proc_doulongvec_minmax,
1495 },
1496 {
1497 .procname = "admin_reserve_kbytes",
1498 .data = &sysctl_admin_reserve_kbytes,
1499 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1500 .mode = 0644,
1501 .proc_handler = proc_doulongvec_minmax,
1502 },
1503 { }
1504 };
1505
1506 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1507 static struct ctl_table binfmt_misc_table[] = {
1508 { }
1509 };
1510 #endif
1511
1512 static struct ctl_table fs_table[] = {
1513 {
1514 .procname = "inode-nr",
1515 .data = &inodes_stat,
1516 .maxlen = 2*sizeof(long),
1517 .mode = 0444,
1518 .proc_handler = proc_nr_inodes,
1519 },
1520 {
1521 .procname = "inode-state",
1522 .data = &inodes_stat,
1523 .maxlen = 7*sizeof(long),
1524 .mode = 0444,
1525 .proc_handler = proc_nr_inodes,
1526 },
1527 {
1528 .procname = "file-nr",
1529 .data = &files_stat,
1530 .maxlen = sizeof(files_stat),
1531 .mode = 0444,
1532 .proc_handler = proc_nr_files,
1533 },
1534 {
1535 .procname = "file-max",
1536 .data = &files_stat.max_files,
1537 .maxlen = sizeof(files_stat.max_files),
1538 .mode = 0644,
1539 .proc_handler = proc_doulongvec_minmax,
1540 },
1541 {
1542 .procname = "nr_open",
1543 .data = &sysctl_nr_open,
1544 .maxlen = sizeof(int),
1545 .mode = 0644,
1546 .proc_handler = proc_dointvec_minmax,
1547 .extra1 = &sysctl_nr_open_min,
1548 .extra2 = &sysctl_nr_open_max,
1549 },
1550 {
1551 .procname = "dentry-state",
1552 .data = &dentry_stat,
1553 .maxlen = 6*sizeof(long),
1554 .mode = 0444,
1555 .proc_handler = proc_nr_dentry,
1556 },
1557 {
1558 .procname = "overflowuid",
1559 .data = &fs_overflowuid,
1560 .maxlen = sizeof(int),
1561 .mode = 0644,
1562 .proc_handler = proc_dointvec_minmax,
1563 .extra1 = &minolduid,
1564 .extra2 = &maxolduid,
1565 },
1566 {
1567 .procname = "overflowgid",
1568 .data = &fs_overflowgid,
1569 .maxlen = sizeof(int),
1570 .mode = 0644,
1571 .proc_handler = proc_dointvec_minmax,
1572 .extra1 = &minolduid,
1573 .extra2 = &maxolduid,
1574 },
1575 #ifdef CONFIG_FILE_LOCKING
1576 {
1577 .procname = "leases-enable",
1578 .data = &leases_enable,
1579 .maxlen = sizeof(int),
1580 .mode = 0644,
1581 .proc_handler = proc_dointvec,
1582 },
1583 #endif
1584 #ifdef CONFIG_DNOTIFY
1585 {
1586 .procname = "dir-notify-enable",
1587 .data = &dir_notify_enable,
1588 .maxlen = sizeof(int),
1589 .mode = 0644,
1590 .proc_handler = proc_dointvec,
1591 },
1592 #endif
1593 #ifdef CONFIG_MMU
1594 #ifdef CONFIG_FILE_LOCKING
1595 {
1596 .procname = "lease-break-time",
1597 .data = &lease_break_time,
1598 .maxlen = sizeof(int),
1599 .mode = 0644,
1600 .proc_handler = proc_dointvec,
1601 },
1602 #endif
1603 #ifdef CONFIG_AIO
1604 {
1605 .procname = "aio-nr",
1606 .data = &aio_nr,
1607 .maxlen = sizeof(aio_nr),
1608 .mode = 0444,
1609 .proc_handler = proc_doulongvec_minmax,
1610 },
1611 {
1612 .procname = "aio-max-nr",
1613 .data = &aio_max_nr,
1614 .maxlen = sizeof(aio_max_nr),
1615 .mode = 0644,
1616 .proc_handler = proc_doulongvec_minmax,
1617 },
1618 #endif /* CONFIG_AIO */
1619 #ifdef CONFIG_INOTIFY_USER
1620 {
1621 .procname = "inotify",
1622 .mode = 0555,
1623 .child = inotify_table,
1624 },
1625 #endif
1626 #ifdef CONFIG_EPOLL
1627 {
1628 .procname = "epoll",
1629 .mode = 0555,
1630 .child = epoll_table,
1631 },
1632 #endif
1633 #endif
1634 {
1635 .procname = "protected_symlinks",
1636 .data = &sysctl_protected_symlinks,
1637 .maxlen = sizeof(int),
1638 .mode = 0600,
1639 .proc_handler = proc_dointvec_minmax,
1640 .extra1 = &zero,
1641 .extra2 = &one,
1642 },
1643 {
1644 .procname = "protected_hardlinks",
1645 .data = &sysctl_protected_hardlinks,
1646 .maxlen = sizeof(int),
1647 .mode = 0600,
1648 .proc_handler = proc_dointvec_minmax,
1649 .extra1 = &zero,
1650 .extra2 = &one,
1651 },
1652 {
1653 .procname = "suid_dumpable",
1654 .data = &suid_dumpable,
1655 .maxlen = sizeof(int),
1656 .mode = 0644,
1657 .proc_handler = proc_dointvec_minmax_coredump,
1658 .extra1 = &zero,
1659 .extra2 = &two,
1660 },
1661 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1662 {
1663 .procname = "binfmt_misc",
1664 .mode = 0555,
1665 .child = binfmt_misc_table,
1666 },
1667 #endif
1668 {
1669 .procname = "pipe-max-size",
1670 .data = &pipe_max_size,
1671 .maxlen = sizeof(int),
1672 .mode = 0644,
1673 .proc_handler = &pipe_proc_fn,
1674 .extra1 = &pipe_min_size,
1675 },
1676 { }
1677 };
1678
1679 static struct ctl_table debug_table[] = {
1680 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1681 {
1682 .procname = "exception-trace",
1683 .data = &show_unhandled_signals,
1684 .maxlen = sizeof(int),
1685 .mode = 0644,
1686 .proc_handler = proc_dointvec
1687 },
1688 #endif
1689 #if defined(CONFIG_OPTPROBES)
1690 {
1691 .procname = "kprobes-optimization",
1692 .data = &sysctl_kprobes_optimization,
1693 .maxlen = sizeof(int),
1694 .mode = 0644,
1695 .proc_handler = proc_kprobes_optimization_handler,
1696 .extra1 = &zero,
1697 .extra2 = &one,
1698 },
1699 #endif
1700 { }
1701 };
1702
1703 static struct ctl_table dev_table[] = {
1704 { }
1705 };
1706
1707 int __init sysctl_init(void)
1708 {
1709 struct ctl_table_header *hdr;
1710
1711 hdr = register_sysctl_table(sysctl_base_table);
1712 kmemleak_not_leak(hdr);
1713 return 0;
1714 }
1715
1716 #endif /* CONFIG_SYSCTL */
1717
1718 /*
1719 * /proc/sys support
1720 */
1721
1722 #ifdef CONFIG_PROC_SYSCTL
1723
1724 static int _proc_do_string(char *data, int maxlen, int write,
1725 char __user *buffer,
1726 size_t *lenp, loff_t *ppos)
1727 {
1728 size_t len;
1729 char __user *p;
1730 char c;
1731
1732 if (!data || !maxlen || !*lenp) {
1733 *lenp = 0;
1734 return 0;
1735 }
1736
1737 if (write) {
1738 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1739 /* Only continue writes not past the end of buffer. */
1740 len = strlen(data);
1741 if (len > maxlen - 1)
1742 len = maxlen - 1;
1743
1744 if (*ppos > len)
1745 return 0;
1746 len = *ppos;
1747 } else {
1748 /* Start writing from beginning of buffer. */
1749 len = 0;
1750 }
1751
1752 *ppos += *lenp;
1753 p = buffer;
1754 while ((p - buffer) < *lenp && len < maxlen - 1) {
1755 if (get_user(c, p++))
1756 return -EFAULT;
1757 if (c == 0 || c == '\n')
1758 break;
1759 data[len++] = c;
1760 }
1761 data[len] = 0;
1762 } else {
1763 len = strlen(data);
1764 if (len > maxlen)
1765 len = maxlen;
1766
1767 if (*ppos > len) {
1768 *lenp = 0;
1769 return 0;
1770 }
1771
1772 data += *ppos;
1773 len -= *ppos;
1774
1775 if (len > *lenp)
1776 len = *lenp;
1777 if (len)
1778 if (copy_to_user(buffer, data, len))
1779 return -EFAULT;
1780 if (len < *lenp) {
1781 if (put_user('\n', buffer + len))
1782 return -EFAULT;
1783 len++;
1784 }
1785 *lenp = len;
1786 *ppos += len;
1787 }
1788 return 0;
1789 }
1790
1791 static void warn_sysctl_write(struct ctl_table *table)
1792 {
1793 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1794 "This will not be supported in the future. To silence this\n"
1795 "warning, set kernel.sysctl_writes_strict = -1\n",
1796 current->comm, table->procname);
1797 }
1798
1799 /**
1800 * proc_dostring - read a string sysctl
1801 * @table: the sysctl table
1802 * @write: %TRUE if this is a write to the sysctl file
1803 * @buffer: the user buffer
1804 * @lenp: the size of the user buffer
1805 * @ppos: file position
1806 *
1807 * Reads/writes a string from/to the user buffer. If the kernel
1808 * buffer provided is not large enough to hold the string, the
1809 * string is truncated. The copied string is %NULL-terminated.
1810 * If the string is being read by the user process, it is copied
1811 * and a newline '\n' is added. It is truncated if the buffer is
1812 * not large enough.
1813 *
1814 * Returns 0 on success.
1815 */
1816 int proc_dostring(struct ctl_table *table, int write,
1817 void __user *buffer, size_t *lenp, loff_t *ppos)
1818 {
1819 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1820 warn_sysctl_write(table);
1821
1822 return _proc_do_string((char *)(table->data), table->maxlen, write,
1823 (char __user *)buffer, lenp, ppos);
1824 }
1825
1826 static size_t proc_skip_spaces(char **buf)
1827 {
1828 size_t ret;
1829 char *tmp = skip_spaces(*buf);
1830 ret = tmp - *buf;
1831 *buf = tmp;
1832 return ret;
1833 }
1834
1835 static void proc_skip_char(char **buf, size_t *size, const char v)
1836 {
1837 while (*size) {
1838 if (**buf != v)
1839 break;
1840 (*size)--;
1841 (*buf)++;
1842 }
1843 }
1844
1845 #define TMPBUFLEN 22
1846 /**
1847 * proc_get_long - reads an ASCII formatted integer from a user buffer
1848 *
1849 * @buf: a kernel buffer
1850 * @size: size of the kernel buffer
1851 * @val: this is where the number will be stored
1852 * @neg: set to %TRUE if number is negative
1853 * @perm_tr: a vector which contains the allowed trailers
1854 * @perm_tr_len: size of the perm_tr vector
1855 * @tr: pointer to store the trailer character
1856 *
1857 * In case of success %0 is returned and @buf and @size are updated with
1858 * the amount of bytes read. If @tr is non-NULL and a trailing
1859 * character exists (size is non-zero after returning from this
1860 * function), @tr is updated with the trailing character.
1861 */
1862 static int proc_get_long(char **buf, size_t *size,
1863 unsigned long *val, bool *neg,
1864 const char *perm_tr, unsigned perm_tr_len, char *tr)
1865 {
1866 int len;
1867 char *p, tmp[TMPBUFLEN];
1868
1869 if (!*size)
1870 return -EINVAL;
1871
1872 len = *size;
1873 if (len > TMPBUFLEN - 1)
1874 len = TMPBUFLEN - 1;
1875
1876 memcpy(tmp, *buf, len);
1877
1878 tmp[len] = 0;
1879 p = tmp;
1880 if (*p == '-' && *size > 1) {
1881 *neg = true;
1882 p++;
1883 } else
1884 *neg = false;
1885 if (!isdigit(*p))
1886 return -EINVAL;
1887
1888 *val = simple_strtoul(p, &p, 0);
1889
1890 len = p - tmp;
1891
1892 /* We don't know if the next char is whitespace thus we may accept
1893 * invalid integers (e.g. 1234...a) or two integers instead of one
1894 * (e.g. 123...1). So lets not allow such large numbers. */
1895 if (len == TMPBUFLEN - 1)
1896 return -EINVAL;
1897
1898 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1899 return -EINVAL;
1900
1901 if (tr && (len < *size))
1902 *tr = *p;
1903
1904 *buf += len;
1905 *size -= len;
1906
1907 return 0;
1908 }
1909
1910 /**
1911 * proc_put_long - converts an integer to a decimal ASCII formatted string
1912 *
1913 * @buf: the user buffer
1914 * @size: the size of the user buffer
1915 * @val: the integer to be converted
1916 * @neg: sign of the number, %TRUE for negative
1917 *
1918 * In case of success %0 is returned and @buf and @size are updated with
1919 * the amount of bytes written.
1920 */
1921 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1922 bool neg)
1923 {
1924 int len;
1925 char tmp[TMPBUFLEN], *p = tmp;
1926
1927 sprintf(p, "%s%lu", neg ? "-" : "", val);
1928 len = strlen(tmp);
1929 if (len > *size)
1930 len = *size;
1931 if (copy_to_user(*buf, tmp, len))
1932 return -EFAULT;
1933 *size -= len;
1934 *buf += len;
1935 return 0;
1936 }
1937 #undef TMPBUFLEN
1938
1939 static int proc_put_char(void __user **buf, size_t *size, char c)
1940 {
1941 if (*size) {
1942 char __user **buffer = (char __user **)buf;
1943 if (put_user(c, *buffer))
1944 return -EFAULT;
1945 (*size)--, (*buffer)++;
1946 *buf = *buffer;
1947 }
1948 return 0;
1949 }
1950
1951 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1952 int *valp,
1953 int write, void *data)
1954 {
1955 if (write) {
1956 *valp = *negp ? -*lvalp : *lvalp;
1957 } else {
1958 int val = *valp;
1959 if (val < 0) {
1960 *negp = true;
1961 *lvalp = (unsigned long)-val;
1962 } else {
1963 *negp = false;
1964 *lvalp = (unsigned long)val;
1965 }
1966 }
1967 return 0;
1968 }
1969
1970 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1971
1972 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1973 int write, void __user *buffer,
1974 size_t *lenp, loff_t *ppos,
1975 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1976 int write, void *data),
1977 void *data)
1978 {
1979 int *i, vleft, first = 1, err = 0;
1980 unsigned long page = 0;
1981 size_t left;
1982 char *kbuf;
1983
1984 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1985 *lenp = 0;
1986 return 0;
1987 }
1988
1989 i = (int *) tbl_data;
1990 vleft = table->maxlen / sizeof(*i);
1991 left = *lenp;
1992
1993 if (!conv)
1994 conv = do_proc_dointvec_conv;
1995
1996 if (write) {
1997 if (*ppos) {
1998 switch (sysctl_writes_strict) {
1999 case SYSCTL_WRITES_STRICT:
2000 goto out;
2001 case SYSCTL_WRITES_WARN:
2002 warn_sysctl_write(table);
2003 break;
2004 default:
2005 break;
2006 }
2007 }
2008
2009 if (left > PAGE_SIZE - 1)
2010 left = PAGE_SIZE - 1;
2011 page = __get_free_page(GFP_TEMPORARY);
2012 kbuf = (char *) page;
2013 if (!kbuf)
2014 return -ENOMEM;
2015 if (copy_from_user(kbuf, buffer, left)) {
2016 err = -EFAULT;
2017 goto free;
2018 }
2019 kbuf[left] = 0;
2020 }
2021
2022 for (; left && vleft--; i++, first=0) {
2023 unsigned long lval;
2024 bool neg;
2025
2026 if (write) {
2027 left -= proc_skip_spaces(&kbuf);
2028
2029 if (!left)
2030 break;
2031 err = proc_get_long(&kbuf, &left, &lval, &neg,
2032 proc_wspace_sep,
2033 sizeof(proc_wspace_sep), NULL);
2034 if (err)
2035 break;
2036 if (conv(&neg, &lval, i, 1, data)) {
2037 err = -EINVAL;
2038 break;
2039 }
2040 } else {
2041 if (conv(&neg, &lval, i, 0, data)) {
2042 err = -EINVAL;
2043 break;
2044 }
2045 if (!first)
2046 err = proc_put_char(&buffer, &left, '\t');
2047 if (err)
2048 break;
2049 err = proc_put_long(&buffer, &left, lval, neg);
2050 if (err)
2051 break;
2052 }
2053 }
2054
2055 if (!write && !first && left && !err)
2056 err = proc_put_char(&buffer, &left, '\n');
2057 if (write && !err && left)
2058 left -= proc_skip_spaces(&kbuf);
2059 free:
2060 if (write) {
2061 free_page(page);
2062 if (first)
2063 return err ? : -EINVAL;
2064 }
2065 *lenp -= left;
2066 out:
2067 *ppos += *lenp;
2068 return err;
2069 }
2070
2071 static int do_proc_dointvec(struct ctl_table *table, int write,
2072 void __user *buffer, size_t *lenp, loff_t *ppos,
2073 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2074 int write, void *data),
2075 void *data)
2076 {
2077 return __do_proc_dointvec(table->data, table, write,
2078 buffer, lenp, ppos, conv, data);
2079 }
2080
2081 /**
2082 * proc_dointvec - read a vector of integers
2083 * @table: the sysctl table
2084 * @write: %TRUE if this is a write to the sysctl file
2085 * @buffer: the user buffer
2086 * @lenp: the size of the user buffer
2087 * @ppos: file position
2088 *
2089 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2090 * values from/to the user buffer, treated as an ASCII string.
2091 *
2092 * Returns 0 on success.
2093 */
2094 int proc_dointvec(struct ctl_table *table, int write,
2095 void __user *buffer, size_t *lenp, loff_t *ppos)
2096 {
2097 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2098 NULL,NULL);
2099 }
2100
2101 /*
2102 * Taint values can only be increased
2103 * This means we can safely use a temporary.
2104 */
2105 static int proc_taint(struct ctl_table *table, int write,
2106 void __user *buffer, size_t *lenp, loff_t *ppos)
2107 {
2108 struct ctl_table t;
2109 unsigned long tmptaint = get_taint();
2110 int err;
2111
2112 if (write && !capable(CAP_SYS_ADMIN))
2113 return -EPERM;
2114
2115 t = *table;
2116 t.data = &tmptaint;
2117 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2118 if (err < 0)
2119 return err;
2120
2121 if (write) {
2122 /*
2123 * Poor man's atomic or. Not worth adding a primitive
2124 * to everyone's atomic.h for this
2125 */
2126 int i;
2127 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2128 if ((tmptaint >> i) & 1)
2129 add_taint(i, LOCKDEP_STILL_OK);
2130 }
2131 }
2132
2133 return err;
2134 }
2135
2136 #ifdef CONFIG_PRINTK
2137 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2138 void __user *buffer, size_t *lenp, loff_t *ppos)
2139 {
2140 if (write && !capable(CAP_SYS_ADMIN))
2141 return -EPERM;
2142
2143 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2144 }
2145 #endif
2146
2147 struct do_proc_dointvec_minmax_conv_param {
2148 int *min;
2149 int *max;
2150 };
2151
2152 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2153 int *valp,
2154 int write, void *data)
2155 {
2156 struct do_proc_dointvec_minmax_conv_param *param = data;
2157 if (write) {
2158 int val = *negp ? -*lvalp : *lvalp;
2159 if ((param->min && *param->min > val) ||
2160 (param->max && *param->max < val))
2161 return -EINVAL;
2162 *valp = val;
2163 } else {
2164 int val = *valp;
2165 if (val < 0) {
2166 *negp = true;
2167 *lvalp = (unsigned long)-val;
2168 } else {
2169 *negp = false;
2170 *lvalp = (unsigned long)val;
2171 }
2172 }
2173 return 0;
2174 }
2175
2176 /**
2177 * proc_dointvec_minmax - read a vector of integers with min/max values
2178 * @table: the sysctl table
2179 * @write: %TRUE if this is a write to the sysctl file
2180 * @buffer: the user buffer
2181 * @lenp: the size of the user buffer
2182 * @ppos: file position
2183 *
2184 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2185 * values from/to the user buffer, treated as an ASCII string.
2186 *
2187 * This routine will ensure the values are within the range specified by
2188 * table->extra1 (min) and table->extra2 (max).
2189 *
2190 * Returns 0 on success.
2191 */
2192 int proc_dointvec_minmax(struct ctl_table *table, int write,
2193 void __user *buffer, size_t *lenp, loff_t *ppos)
2194 {
2195 struct do_proc_dointvec_minmax_conv_param param = {
2196 .min = (int *) table->extra1,
2197 .max = (int *) table->extra2,
2198 };
2199 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2200 do_proc_dointvec_minmax_conv, &param);
2201 }
2202
2203 static void validate_coredump_safety(void)
2204 {
2205 #ifdef CONFIG_COREDUMP
2206 if (suid_dumpable == SUID_DUMP_ROOT &&
2207 core_pattern[0] != '/' && core_pattern[0] != '|') {
2208 printk(KERN_WARNING "Unsafe core_pattern used with "\
2209 "suid_dumpable=2. Pipe handler or fully qualified "\
2210 "core dump path required.\n");
2211 }
2212 #endif
2213 }
2214
2215 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2216 void __user *buffer, size_t *lenp, loff_t *ppos)
2217 {
2218 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2219 if (!error)
2220 validate_coredump_safety();
2221 return error;
2222 }
2223
2224 #ifdef CONFIG_COREDUMP
2225 static int proc_dostring_coredump(struct ctl_table *table, int write,
2226 void __user *buffer, size_t *lenp, loff_t *ppos)
2227 {
2228 int error = proc_dostring(table, write, buffer, lenp, ppos);
2229 if (!error)
2230 validate_coredump_safety();
2231 return error;
2232 }
2233 #endif
2234
2235 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2236 void __user *buffer,
2237 size_t *lenp, loff_t *ppos,
2238 unsigned long convmul,
2239 unsigned long convdiv)
2240 {
2241 unsigned long *i, *min, *max;
2242 int vleft, first = 1, err = 0;
2243 unsigned long page = 0;
2244 size_t left;
2245 char *kbuf;
2246
2247 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2248 *lenp = 0;
2249 return 0;
2250 }
2251
2252 i = (unsigned long *) data;
2253 min = (unsigned long *) table->extra1;
2254 max = (unsigned long *) table->extra2;
2255 vleft = table->maxlen / sizeof(unsigned long);
2256 left = *lenp;
2257
2258 if (write) {
2259 if (*ppos) {
2260 switch (sysctl_writes_strict) {
2261 case SYSCTL_WRITES_STRICT:
2262 goto out;
2263 case SYSCTL_WRITES_WARN:
2264 warn_sysctl_write(table);
2265 break;
2266 default:
2267 break;
2268 }
2269 }
2270
2271 if (left > PAGE_SIZE - 1)
2272 left = PAGE_SIZE - 1;
2273 page = __get_free_page(GFP_TEMPORARY);
2274 kbuf = (char *) page;
2275 if (!kbuf)
2276 return -ENOMEM;
2277 if (copy_from_user(kbuf, buffer, left)) {
2278 err = -EFAULT;
2279 goto free;
2280 }
2281 kbuf[left] = 0;
2282 }
2283
2284 for (; left && vleft--; i++, first = 0) {
2285 unsigned long val;
2286
2287 if (write) {
2288 bool neg;
2289
2290 left -= proc_skip_spaces(&kbuf);
2291
2292 err = proc_get_long(&kbuf, &left, &val, &neg,
2293 proc_wspace_sep,
2294 sizeof(proc_wspace_sep), NULL);
2295 if (err)
2296 break;
2297 if (neg)
2298 continue;
2299 if ((min && val < *min) || (max && val > *max))
2300 continue;
2301 *i = val;
2302 } else {
2303 val = convdiv * (*i) / convmul;
2304 if (!first) {
2305 err = proc_put_char(&buffer, &left, '\t');
2306 if (err)
2307 break;
2308 }
2309 err = proc_put_long(&buffer, &left, val, false);
2310 if (err)
2311 break;
2312 }
2313 }
2314
2315 if (!write && !first && left && !err)
2316 err = proc_put_char(&buffer, &left, '\n');
2317 if (write && !err)
2318 left -= proc_skip_spaces(&kbuf);
2319 free:
2320 if (write) {
2321 free_page(page);
2322 if (first)
2323 return err ? : -EINVAL;
2324 }
2325 *lenp -= left;
2326 out:
2327 *ppos += *lenp;
2328 return err;
2329 }
2330
2331 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2332 void __user *buffer,
2333 size_t *lenp, loff_t *ppos,
2334 unsigned long convmul,
2335 unsigned long convdiv)
2336 {
2337 return __do_proc_doulongvec_minmax(table->data, table, write,
2338 buffer, lenp, ppos, convmul, convdiv);
2339 }
2340
2341 /**
2342 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2343 * @table: the sysctl table
2344 * @write: %TRUE if this is a write to the sysctl file
2345 * @buffer: the user buffer
2346 * @lenp: the size of the user buffer
2347 * @ppos: file position
2348 *
2349 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2350 * values from/to the user buffer, treated as an ASCII string.
2351 *
2352 * This routine will ensure the values are within the range specified by
2353 * table->extra1 (min) and table->extra2 (max).
2354 *
2355 * Returns 0 on success.
2356 */
2357 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2358 void __user *buffer, size_t *lenp, loff_t *ppos)
2359 {
2360 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2361 }
2362
2363 /**
2364 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2365 * @table: the sysctl table
2366 * @write: %TRUE if this is a write to the sysctl file
2367 * @buffer: the user buffer
2368 * @lenp: the size of the user buffer
2369 * @ppos: file position
2370 *
2371 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2372 * values from/to the user buffer, treated as an ASCII string. The values
2373 * are treated as milliseconds, and converted to jiffies when they are stored.
2374 *
2375 * This routine will ensure the values are within the range specified by
2376 * table->extra1 (min) and table->extra2 (max).
2377 *
2378 * Returns 0 on success.
2379 */
2380 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2381 void __user *buffer,
2382 size_t *lenp, loff_t *ppos)
2383 {
2384 return do_proc_doulongvec_minmax(table, write, buffer,
2385 lenp, ppos, HZ, 1000l);
2386 }
2387
2388
2389 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2390 int *valp,
2391 int write, void *data)
2392 {
2393 if (write) {
2394 if (*lvalp > LONG_MAX / HZ)
2395 return 1;
2396 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2397 } else {
2398 int val = *valp;
2399 unsigned long lval;
2400 if (val < 0) {
2401 *negp = true;
2402 lval = (unsigned long)-val;
2403 } else {
2404 *negp = false;
2405 lval = (unsigned long)val;
2406 }
2407 *lvalp = lval / HZ;
2408 }
2409 return 0;
2410 }
2411
2412 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2413 int *valp,
2414 int write, void *data)
2415 {
2416 if (write) {
2417 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2418 return 1;
2419 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2420 } else {
2421 int val = *valp;
2422 unsigned long lval;
2423 if (val < 0) {
2424 *negp = true;
2425 lval = (unsigned long)-val;
2426 } else {
2427 *negp = false;
2428 lval = (unsigned long)val;
2429 }
2430 *lvalp = jiffies_to_clock_t(lval);
2431 }
2432 return 0;
2433 }
2434
2435 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2436 int *valp,
2437 int write, void *data)
2438 {
2439 if (write) {
2440 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2441
2442 if (jif > INT_MAX)
2443 return 1;
2444 *valp = (int)jif;
2445 } else {
2446 int val = *valp;
2447 unsigned long lval;
2448 if (val < 0) {
2449 *negp = true;
2450 lval = (unsigned long)-val;
2451 } else {
2452 *negp = false;
2453 lval = (unsigned long)val;
2454 }
2455 *lvalp = jiffies_to_msecs(lval);
2456 }
2457 return 0;
2458 }
2459
2460 /**
2461 * proc_dointvec_jiffies - read a vector of integers as seconds
2462 * @table: the sysctl table
2463 * @write: %TRUE if this is a write to the sysctl file
2464 * @buffer: the user buffer
2465 * @lenp: the size of the user buffer
2466 * @ppos: file position
2467 *
2468 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2469 * values from/to the user buffer, treated as an ASCII string.
2470 * The values read are assumed to be in seconds, and are converted into
2471 * jiffies.
2472 *
2473 * Returns 0 on success.
2474 */
2475 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2476 void __user *buffer, size_t *lenp, loff_t *ppos)
2477 {
2478 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2479 do_proc_dointvec_jiffies_conv,NULL);
2480 }
2481
2482 /**
2483 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2484 * @table: the sysctl table
2485 * @write: %TRUE if this is a write to the sysctl file
2486 * @buffer: the user buffer
2487 * @lenp: the size of the user buffer
2488 * @ppos: pointer to the file position
2489 *
2490 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2491 * values from/to the user buffer, treated as an ASCII string.
2492 * The values read are assumed to be in 1/USER_HZ seconds, and
2493 * are converted into jiffies.
2494 *
2495 * Returns 0 on success.
2496 */
2497 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2498 void __user *buffer, size_t *lenp, loff_t *ppos)
2499 {
2500 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2501 do_proc_dointvec_userhz_jiffies_conv,NULL);
2502 }
2503
2504 /**
2505 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2506 * @table: the sysctl table
2507 * @write: %TRUE if this is a write to the sysctl file
2508 * @buffer: the user buffer
2509 * @lenp: the size of the user buffer
2510 * @ppos: file position
2511 * @ppos: the current position in the file
2512 *
2513 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2514 * values from/to the user buffer, treated as an ASCII string.
2515 * The values read are assumed to be in 1/1000 seconds, and
2516 * are converted into jiffies.
2517 *
2518 * Returns 0 on success.
2519 */
2520 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2521 void __user *buffer, size_t *lenp, loff_t *ppos)
2522 {
2523 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2524 do_proc_dointvec_ms_jiffies_conv, NULL);
2525 }
2526
2527 static int proc_do_cad_pid(struct ctl_table *table, int write,
2528 void __user *buffer, size_t *lenp, loff_t *ppos)
2529 {
2530 struct pid *new_pid;
2531 pid_t tmp;
2532 int r;
2533
2534 tmp = pid_vnr(cad_pid);
2535
2536 r = __do_proc_dointvec(&tmp, table, write, buffer,
2537 lenp, ppos, NULL, NULL);
2538 if (r || !write)
2539 return r;
2540
2541 new_pid = find_get_pid(tmp);
2542 if (!new_pid)
2543 return -ESRCH;
2544
2545 put_pid(xchg(&cad_pid, new_pid));
2546 return 0;
2547 }
2548
2549 /**
2550 * proc_do_large_bitmap - read/write from/to a large bitmap
2551 * @table: the sysctl table
2552 * @write: %TRUE if this is a write to the sysctl file
2553 * @buffer: the user buffer
2554 * @lenp: the size of the user buffer
2555 * @ppos: file position
2556 *
2557 * The bitmap is stored at table->data and the bitmap length (in bits)
2558 * in table->maxlen.
2559 *
2560 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2561 * large bitmaps may be represented in a compact manner. Writing into
2562 * the file will clear the bitmap then update it with the given input.
2563 *
2564 * Returns 0 on success.
2565 */
2566 int proc_do_large_bitmap(struct ctl_table *table, int write,
2567 void __user *buffer, size_t *lenp, loff_t *ppos)
2568 {
2569 int err = 0;
2570 bool first = 1;
2571 size_t left = *lenp;
2572 unsigned long bitmap_len = table->maxlen;
2573 unsigned long *bitmap = *(unsigned long **) table->data;
2574 unsigned long *tmp_bitmap = NULL;
2575 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2576
2577 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2578 *lenp = 0;
2579 return 0;
2580 }
2581
2582 if (write) {
2583 unsigned long page = 0;
2584 char *kbuf;
2585
2586 if (left > PAGE_SIZE - 1)
2587 left = PAGE_SIZE - 1;
2588
2589 page = __get_free_page(GFP_TEMPORARY);
2590 kbuf = (char *) page;
2591 if (!kbuf)
2592 return -ENOMEM;
2593 if (copy_from_user(kbuf, buffer, left)) {
2594 free_page(page);
2595 return -EFAULT;
2596 }
2597 kbuf[left] = 0;
2598
2599 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2600 GFP_KERNEL);
2601 if (!tmp_bitmap) {
2602 free_page(page);
2603 return -ENOMEM;
2604 }
2605 proc_skip_char(&kbuf, &left, '\n');
2606 while (!err && left) {
2607 unsigned long val_a, val_b;
2608 bool neg;
2609
2610 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2611 sizeof(tr_a), &c);
2612 if (err)
2613 break;
2614 if (val_a >= bitmap_len || neg) {
2615 err = -EINVAL;
2616 break;
2617 }
2618
2619 val_b = val_a;
2620 if (left) {
2621 kbuf++;
2622 left--;
2623 }
2624
2625 if (c == '-') {
2626 err = proc_get_long(&kbuf, &left, &val_b,
2627 &neg, tr_b, sizeof(tr_b),
2628 &c);
2629 if (err)
2630 break;
2631 if (val_b >= bitmap_len || neg ||
2632 val_a > val_b) {
2633 err = -EINVAL;
2634 break;
2635 }
2636 if (left) {
2637 kbuf++;
2638 left--;
2639 }
2640 }
2641
2642 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2643 first = 0;
2644 proc_skip_char(&kbuf, &left, '\n');
2645 }
2646 free_page(page);
2647 } else {
2648 unsigned long bit_a, bit_b = 0;
2649
2650 while (left) {
2651 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2652 if (bit_a >= bitmap_len)
2653 break;
2654 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2655 bit_a + 1) - 1;
2656
2657 if (!first) {
2658 err = proc_put_char(&buffer, &left, ',');
2659 if (err)
2660 break;
2661 }
2662 err = proc_put_long(&buffer, &left, bit_a, false);
2663 if (err)
2664 break;
2665 if (bit_a != bit_b) {
2666 err = proc_put_char(&buffer, &left, '-');
2667 if (err)
2668 break;
2669 err = proc_put_long(&buffer, &left, bit_b, false);
2670 if (err)
2671 break;
2672 }
2673
2674 first = 0; bit_b++;
2675 }
2676 if (!err)
2677 err = proc_put_char(&buffer, &left, '\n');
2678 }
2679
2680 if (!err) {
2681 if (write) {
2682 if (*ppos)
2683 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2684 else
2685 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2686 }
2687 kfree(tmp_bitmap);
2688 *lenp -= left;
2689 *ppos += *lenp;
2690 return 0;
2691 } else {
2692 kfree(tmp_bitmap);
2693 return err;
2694 }
2695 }
2696
2697 #else /* CONFIG_PROC_SYSCTL */
2698
2699 int proc_dostring(struct ctl_table *table, int write,
2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701 {
2702 return -ENOSYS;
2703 }
2704
2705 int proc_dointvec(struct ctl_table *table, int write,
2706 void __user *buffer, size_t *lenp, loff_t *ppos)
2707 {
2708 return -ENOSYS;
2709 }
2710
2711 int proc_dointvec_minmax(struct ctl_table *table, int write,
2712 void __user *buffer, size_t *lenp, loff_t *ppos)
2713 {
2714 return -ENOSYS;
2715 }
2716
2717 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2718 void __user *buffer, size_t *lenp, loff_t *ppos)
2719 {
2720 return -ENOSYS;
2721 }
2722
2723 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2724 void __user *buffer, size_t *lenp, loff_t *ppos)
2725 {
2726 return -ENOSYS;
2727 }
2728
2729 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2730 void __user *buffer, size_t *lenp, loff_t *ppos)
2731 {
2732 return -ENOSYS;
2733 }
2734
2735 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2736 void __user *buffer, size_t *lenp, loff_t *ppos)
2737 {
2738 return -ENOSYS;
2739 }
2740
2741 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2742 void __user *buffer,
2743 size_t *lenp, loff_t *ppos)
2744 {
2745 return -ENOSYS;
2746 }
2747
2748
2749 #endif /* CONFIG_PROC_SYSCTL */
2750
2751 /*
2752 * No sense putting this after each symbol definition, twice,
2753 * exception granted :-)
2754 */
2755 EXPORT_SYMBOL(proc_dointvec);
2756 EXPORT_SYMBOL(proc_dointvec_jiffies);
2757 EXPORT_SYMBOL(proc_dointvec_minmax);
2758 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2759 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2760 EXPORT_SYMBOL(proc_dostring);
2761 EXPORT_SYMBOL(proc_doulongvec_minmax);
2762 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);