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hung_task: Change sysctl_hung_task_check_count to 'int'
[deliverable/linux.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
68
69 #ifdef CONFIG_X86
70 #include <asm/nmi.h>
71 #include <asm/stacktrace.h>
72 #include <asm/io.h>
73 #endif
74 #ifdef CONFIG_SPARC
75 #include <asm/setup.h>
76 #endif
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
79 #endif
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
82 #endif
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
85 #endif
86 #ifdef CONFIG_CHR_DEV_SG
87 #include <scsi/sg.h>
88 #endif
89
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
92 #endif
93
94
95 #if defined(CONFIG_SYSCTL)
96
97 /* External variables not in a header file. */
98 extern int sysctl_overcommit_memory;
99 extern int sysctl_overcommit_ratio;
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 #ifdef CONFIG_BLOCK
117 extern int blk_iopoll_enabled;
118 #endif
119
120 /* Constants used for minimum and maximum */
121 #ifdef CONFIG_LOCKUP_DETECTOR
122 static int sixty = 60;
123 #endif
124
125 static int zero;
126 static int __maybe_unused one = 1;
127 static int __maybe_unused two = 2;
128 static int __maybe_unused three = 3;
129 static unsigned long one_ul = 1;
130 static int one_hundred = 100;
131 #ifdef CONFIG_PRINTK
132 static int ten_thousand = 10000;
133 #endif
134
135 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
136 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
137
138 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
139 static int maxolduid = 65535;
140 static int minolduid;
141 static int min_percpu_pagelist_fract = 8;
142
143 static int ngroups_max = NGROUPS_MAX;
144 static const int cap_last_cap = CAP_LAST_CAP;
145
146 #ifdef CONFIG_INOTIFY_USER
147 #include <linux/inotify.h>
148 #endif
149 #ifdef CONFIG_SPARC
150 #endif
151
152 #ifdef CONFIG_SPARC64
153 extern int sysctl_tsb_ratio;
154 #endif
155
156 #ifdef __hppa__
157 extern int pwrsw_enabled;
158 #endif
159
160 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
161 extern int unaligned_enabled;
162 #endif
163
164 #ifdef CONFIG_IA64
165 extern int unaligned_dump_stack;
166 #endif
167
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
169 extern int no_unaligned_warning;
170 #endif
171
172 #ifdef CONFIG_PROC_SYSCTL
173 static int proc_do_cad_pid(struct ctl_table *table, int write,
174 void __user *buffer, size_t *lenp, loff_t *ppos);
175 static int proc_taint(struct ctl_table *table, int write,
176 void __user *buffer, size_t *lenp, loff_t *ppos);
177 #endif
178
179 #ifdef CONFIG_PRINTK
180 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
181 void __user *buffer, size_t *lenp, loff_t *ppos);
182 #endif
183
184 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
185 void __user *buffer, size_t *lenp, loff_t *ppos);
186 #ifdef CONFIG_COREDUMP
187 static int proc_dostring_coredump(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp, loff_t *ppos);
189 #endif
190
191 #ifdef CONFIG_MAGIC_SYSRQ
192 /* Note: sysrq code uses it's own private copy */
193 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
194
195 static int sysrq_sysctl_handler(ctl_table *table, int write,
196 void __user *buffer, size_t *lenp,
197 loff_t *ppos)
198 {
199 int error;
200
201 error = proc_dointvec(table, write, buffer, lenp, ppos);
202 if (error)
203 return error;
204
205 if (write)
206 sysrq_toggle_support(__sysrq_enabled);
207
208 return 0;
209 }
210
211 #endif
212
213 static struct ctl_table kern_table[];
214 static struct ctl_table vm_table[];
215 static struct ctl_table fs_table[];
216 static struct ctl_table debug_table[];
217 static struct ctl_table dev_table[];
218 extern struct ctl_table random_table[];
219 #ifdef CONFIG_EPOLL
220 extern struct ctl_table epoll_table[];
221 #endif
222
223 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
224 int sysctl_legacy_va_layout;
225 #endif
226
227 /* The default sysctl tables: */
228
229 static struct ctl_table sysctl_base_table[] = {
230 {
231 .procname = "kernel",
232 .mode = 0555,
233 .child = kern_table,
234 },
235 {
236 .procname = "vm",
237 .mode = 0555,
238 .child = vm_table,
239 },
240 {
241 .procname = "fs",
242 .mode = 0555,
243 .child = fs_table,
244 },
245 {
246 .procname = "debug",
247 .mode = 0555,
248 .child = debug_table,
249 },
250 {
251 .procname = "dev",
252 .mode = 0555,
253 .child = dev_table,
254 },
255 { }
256 };
257
258 #ifdef CONFIG_SCHED_DEBUG
259 static int min_sched_granularity_ns = 100000; /* 100 usecs */
260 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
261 static int min_wakeup_granularity_ns; /* 0 usecs */
262 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
263 #ifdef CONFIG_SMP
264 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
265 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
266 #endif /* CONFIG_SMP */
267 #endif /* CONFIG_SCHED_DEBUG */
268
269 #ifdef CONFIG_COMPACTION
270 static int min_extfrag_threshold;
271 static int max_extfrag_threshold = 1000;
272 #endif
273
274 static struct ctl_table kern_table[] = {
275 {
276 .procname = "sched_child_runs_first",
277 .data = &sysctl_sched_child_runs_first,
278 .maxlen = sizeof(unsigned int),
279 .mode = 0644,
280 .proc_handler = proc_dointvec,
281 },
282 #ifdef CONFIG_SCHED_DEBUG
283 {
284 .procname = "sched_min_granularity_ns",
285 .data = &sysctl_sched_min_granularity,
286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
288 .proc_handler = sched_proc_update_handler,
289 .extra1 = &min_sched_granularity_ns,
290 .extra2 = &max_sched_granularity_ns,
291 },
292 {
293 .procname = "sched_latency_ns",
294 .data = &sysctl_sched_latency,
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_wakeup_granularity_ns",
303 .data = &sysctl_sched_wakeup_granularity,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
306 .proc_handler = sched_proc_update_handler,
307 .extra1 = &min_wakeup_granularity_ns,
308 .extra2 = &max_wakeup_granularity_ns,
309 },
310 #ifdef CONFIG_SMP
311 {
312 .procname = "sched_tunable_scaling",
313 .data = &sysctl_sched_tunable_scaling,
314 .maxlen = sizeof(enum sched_tunable_scaling),
315 .mode = 0644,
316 .proc_handler = sched_proc_update_handler,
317 .extra1 = &min_sched_tunable_scaling,
318 .extra2 = &max_sched_tunable_scaling,
319 },
320 {
321 .procname = "sched_migration_cost_ns",
322 .data = &sysctl_sched_migration_cost,
323 .maxlen = sizeof(unsigned int),
324 .mode = 0644,
325 .proc_handler = proc_dointvec,
326 },
327 {
328 .procname = "sched_nr_migrate",
329 .data = &sysctl_sched_nr_migrate,
330 .maxlen = sizeof(unsigned int),
331 .mode = 0644,
332 .proc_handler = proc_dointvec,
333 },
334 {
335 .procname = "sched_time_avg_ms",
336 .data = &sysctl_sched_time_avg,
337 .maxlen = sizeof(unsigned int),
338 .mode = 0644,
339 .proc_handler = proc_dointvec,
340 },
341 {
342 .procname = "sched_shares_window_ns",
343 .data = &sysctl_sched_shares_window,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = proc_dointvec,
347 },
348 {
349 .procname = "timer_migration",
350 .data = &sysctl_timer_migration,
351 .maxlen = sizeof(unsigned int),
352 .mode = 0644,
353 .proc_handler = proc_dointvec_minmax,
354 .extra1 = &zero,
355 .extra2 = &one,
356 },
357 #endif /* CONFIG_SMP */
358 #ifdef CONFIG_NUMA_BALANCING
359 {
360 .procname = "numa_balancing_scan_delay_ms",
361 .data = &sysctl_numa_balancing_scan_delay,
362 .maxlen = sizeof(unsigned int),
363 .mode = 0644,
364 .proc_handler = proc_dointvec,
365 },
366 {
367 .procname = "numa_balancing_scan_period_min_ms",
368 .data = &sysctl_numa_balancing_scan_period_min,
369 .maxlen = sizeof(unsigned int),
370 .mode = 0644,
371 .proc_handler = proc_dointvec,
372 },
373 {
374 .procname = "numa_balancing_scan_period_reset",
375 .data = &sysctl_numa_balancing_scan_period_reset,
376 .maxlen = sizeof(unsigned int),
377 .mode = 0644,
378 .proc_handler = proc_dointvec,
379 },
380 {
381 .procname = "numa_balancing_scan_period_max_ms",
382 .data = &sysctl_numa_balancing_scan_period_max,
383 .maxlen = sizeof(unsigned int),
384 .mode = 0644,
385 .proc_handler = proc_dointvec,
386 },
387 {
388 .procname = "numa_balancing_scan_size_mb",
389 .data = &sysctl_numa_balancing_scan_size,
390 .maxlen = sizeof(unsigned int),
391 .mode = 0644,
392 .proc_handler = proc_dointvec,
393 },
394 #endif /* CONFIG_NUMA_BALANCING */
395 #endif /* CONFIG_SCHED_DEBUG */
396 {
397 .procname = "sched_rt_period_us",
398 .data = &sysctl_sched_rt_period,
399 .maxlen = sizeof(unsigned int),
400 .mode = 0644,
401 .proc_handler = sched_rt_handler,
402 },
403 {
404 .procname = "sched_rt_runtime_us",
405 .data = &sysctl_sched_rt_runtime,
406 .maxlen = sizeof(int),
407 .mode = 0644,
408 .proc_handler = sched_rt_handler,
409 },
410 {
411 .procname = "sched_rr_timeslice_ms",
412 .data = &sched_rr_timeslice,
413 .maxlen = sizeof(int),
414 .mode = 0644,
415 .proc_handler = sched_rr_handler,
416 },
417 #ifdef CONFIG_SCHED_AUTOGROUP
418 {
419 .procname = "sched_autogroup_enabled",
420 .data = &sysctl_sched_autogroup_enabled,
421 .maxlen = sizeof(unsigned int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec_minmax,
424 .extra1 = &zero,
425 .extra2 = &one,
426 },
427 #endif
428 #ifdef CONFIG_CFS_BANDWIDTH
429 {
430 .procname = "sched_cfs_bandwidth_slice_us",
431 .data = &sysctl_sched_cfs_bandwidth_slice,
432 .maxlen = sizeof(unsigned int),
433 .mode = 0644,
434 .proc_handler = proc_dointvec_minmax,
435 .extra1 = &one,
436 },
437 #endif
438 #ifdef CONFIG_PROVE_LOCKING
439 {
440 .procname = "prove_locking",
441 .data = &prove_locking,
442 .maxlen = sizeof(int),
443 .mode = 0644,
444 .proc_handler = proc_dointvec,
445 },
446 #endif
447 #ifdef CONFIG_LOCK_STAT
448 {
449 .procname = "lock_stat",
450 .data = &lock_stat,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = proc_dointvec,
454 },
455 #endif
456 {
457 .procname = "panic",
458 .data = &panic_timeout,
459 .maxlen = sizeof(int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec,
462 },
463 #ifdef CONFIG_COREDUMP
464 {
465 .procname = "core_uses_pid",
466 .data = &core_uses_pid,
467 .maxlen = sizeof(int),
468 .mode = 0644,
469 .proc_handler = proc_dointvec,
470 },
471 {
472 .procname = "core_pattern",
473 .data = core_pattern,
474 .maxlen = CORENAME_MAX_SIZE,
475 .mode = 0644,
476 .proc_handler = proc_dostring_coredump,
477 },
478 {
479 .procname = "core_pipe_limit",
480 .data = &core_pipe_limit,
481 .maxlen = sizeof(unsigned int),
482 .mode = 0644,
483 .proc_handler = proc_dointvec,
484 },
485 #endif
486 #ifdef CONFIG_PROC_SYSCTL
487 {
488 .procname = "tainted",
489 .maxlen = sizeof(long),
490 .mode = 0644,
491 .proc_handler = proc_taint,
492 },
493 #endif
494 #ifdef CONFIG_LATENCYTOP
495 {
496 .procname = "latencytop",
497 .data = &latencytop_enabled,
498 .maxlen = sizeof(int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec,
501 },
502 #endif
503 #ifdef CONFIG_BLK_DEV_INITRD
504 {
505 .procname = "real-root-dev",
506 .data = &real_root_dev,
507 .maxlen = sizeof(int),
508 .mode = 0644,
509 .proc_handler = proc_dointvec,
510 },
511 #endif
512 {
513 .procname = "print-fatal-signals",
514 .data = &print_fatal_signals,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519 #ifdef CONFIG_SPARC
520 {
521 .procname = "reboot-cmd",
522 .data = reboot_command,
523 .maxlen = 256,
524 .mode = 0644,
525 .proc_handler = proc_dostring,
526 },
527 {
528 .procname = "stop-a",
529 .data = &stop_a_enabled,
530 .maxlen = sizeof (int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec,
533 },
534 {
535 .procname = "scons-poweroff",
536 .data = &scons_pwroff,
537 .maxlen = sizeof (int),
538 .mode = 0644,
539 .proc_handler = proc_dointvec,
540 },
541 #endif
542 #ifdef CONFIG_SPARC64
543 {
544 .procname = "tsb-ratio",
545 .data = &sysctl_tsb_ratio,
546 .maxlen = sizeof (int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec,
549 },
550 #endif
551 #ifdef __hppa__
552 {
553 .procname = "soft-power",
554 .data = &pwrsw_enabled,
555 .maxlen = sizeof (int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec,
558 },
559 #endif
560 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
561 {
562 .procname = "unaligned-trap",
563 .data = &unaligned_enabled,
564 .maxlen = sizeof (int),
565 .mode = 0644,
566 .proc_handler = proc_dointvec,
567 },
568 #endif
569 {
570 .procname = "ctrl-alt-del",
571 .data = &C_A_D,
572 .maxlen = sizeof(int),
573 .mode = 0644,
574 .proc_handler = proc_dointvec,
575 },
576 #ifdef CONFIG_FUNCTION_TRACER
577 {
578 .procname = "ftrace_enabled",
579 .data = &ftrace_enabled,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = ftrace_enable_sysctl,
583 },
584 #endif
585 #ifdef CONFIG_STACK_TRACER
586 {
587 .procname = "stack_tracer_enabled",
588 .data = &stack_tracer_enabled,
589 .maxlen = sizeof(int),
590 .mode = 0644,
591 .proc_handler = stack_trace_sysctl,
592 },
593 #endif
594 #ifdef CONFIG_TRACING
595 {
596 .procname = "ftrace_dump_on_oops",
597 .data = &ftrace_dump_on_oops,
598 .maxlen = sizeof(int),
599 .mode = 0644,
600 .proc_handler = proc_dointvec,
601 },
602 {
603 .procname = "traceoff_on_warning",
604 .data = &__disable_trace_on_warning,
605 .maxlen = sizeof(__disable_trace_on_warning),
606 .mode = 0644,
607 .proc_handler = proc_dointvec,
608 },
609 #endif
610 #ifdef CONFIG_MODULES
611 {
612 .procname = "modprobe",
613 .data = &modprobe_path,
614 .maxlen = KMOD_PATH_LEN,
615 .mode = 0644,
616 .proc_handler = proc_dostring,
617 },
618 {
619 .procname = "modules_disabled",
620 .data = &modules_disabled,
621 .maxlen = sizeof(int),
622 .mode = 0644,
623 /* only handle a transition from default "0" to "1" */
624 .proc_handler = proc_dointvec_minmax,
625 .extra1 = &one,
626 .extra2 = &one,
627 },
628 #endif
629
630 {
631 .procname = "hotplug",
632 .data = &uevent_helper,
633 .maxlen = UEVENT_HELPER_PATH_LEN,
634 .mode = 0644,
635 .proc_handler = proc_dostring,
636 },
637
638 #ifdef CONFIG_CHR_DEV_SG
639 {
640 .procname = "sg-big-buff",
641 .data = &sg_big_buff,
642 .maxlen = sizeof (int),
643 .mode = 0444,
644 .proc_handler = proc_dointvec,
645 },
646 #endif
647 #ifdef CONFIG_BSD_PROCESS_ACCT
648 {
649 .procname = "acct",
650 .data = &acct_parm,
651 .maxlen = 3*sizeof(int),
652 .mode = 0644,
653 .proc_handler = proc_dointvec,
654 },
655 #endif
656 #ifdef CONFIG_MAGIC_SYSRQ
657 {
658 .procname = "sysrq",
659 .data = &__sysrq_enabled,
660 .maxlen = sizeof (int),
661 .mode = 0644,
662 .proc_handler = sysrq_sysctl_handler,
663 },
664 #endif
665 #ifdef CONFIG_PROC_SYSCTL
666 {
667 .procname = "cad_pid",
668 .data = NULL,
669 .maxlen = sizeof (int),
670 .mode = 0600,
671 .proc_handler = proc_do_cad_pid,
672 },
673 #endif
674 {
675 .procname = "threads-max",
676 .data = &max_threads,
677 .maxlen = sizeof(int),
678 .mode = 0644,
679 .proc_handler = proc_dointvec,
680 },
681 {
682 .procname = "random",
683 .mode = 0555,
684 .child = random_table,
685 },
686 {
687 .procname = "usermodehelper",
688 .mode = 0555,
689 .child = usermodehelper_table,
690 },
691 {
692 .procname = "overflowuid",
693 .data = &overflowuid,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = proc_dointvec_minmax,
697 .extra1 = &minolduid,
698 .extra2 = &maxolduid,
699 },
700 {
701 .procname = "overflowgid",
702 .data = &overflowgid,
703 .maxlen = sizeof(int),
704 .mode = 0644,
705 .proc_handler = proc_dointvec_minmax,
706 .extra1 = &minolduid,
707 .extra2 = &maxolduid,
708 },
709 #ifdef CONFIG_S390
710 #ifdef CONFIG_MATHEMU
711 {
712 .procname = "ieee_emulation_warnings",
713 .data = &sysctl_ieee_emulation_warnings,
714 .maxlen = sizeof(int),
715 .mode = 0644,
716 .proc_handler = proc_dointvec,
717 },
718 #endif
719 {
720 .procname = "userprocess_debug",
721 .data = &show_unhandled_signals,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec,
725 },
726 #endif
727 {
728 .procname = "pid_max",
729 .data = &pid_max,
730 .maxlen = sizeof (int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec_minmax,
733 .extra1 = &pid_max_min,
734 .extra2 = &pid_max_max,
735 },
736 {
737 .procname = "panic_on_oops",
738 .data = &panic_on_oops,
739 .maxlen = sizeof(int),
740 .mode = 0644,
741 .proc_handler = proc_dointvec,
742 },
743 #if defined CONFIG_PRINTK
744 {
745 .procname = "printk",
746 .data = &console_loglevel,
747 .maxlen = 4*sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dointvec,
750 },
751 {
752 .procname = "printk_ratelimit",
753 .data = &printk_ratelimit_state.interval,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec_jiffies,
757 },
758 {
759 .procname = "printk_ratelimit_burst",
760 .data = &printk_ratelimit_state.burst,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec,
764 },
765 {
766 .procname = "printk_delay",
767 .data = &printk_delay_msec,
768 .maxlen = sizeof(int),
769 .mode = 0644,
770 .proc_handler = proc_dointvec_minmax,
771 .extra1 = &zero,
772 .extra2 = &ten_thousand,
773 },
774 {
775 .procname = "dmesg_restrict",
776 .data = &dmesg_restrict,
777 .maxlen = sizeof(int),
778 .mode = 0644,
779 .proc_handler = proc_dointvec_minmax_sysadmin,
780 .extra1 = &zero,
781 .extra2 = &one,
782 },
783 {
784 .procname = "kptr_restrict",
785 .data = &kptr_restrict,
786 .maxlen = sizeof(int),
787 .mode = 0644,
788 .proc_handler = proc_dointvec_minmax_sysadmin,
789 .extra1 = &zero,
790 .extra2 = &two,
791 },
792 #endif
793 {
794 .procname = "ngroups_max",
795 .data = &ngroups_max,
796 .maxlen = sizeof (int),
797 .mode = 0444,
798 .proc_handler = proc_dointvec,
799 },
800 {
801 .procname = "cap_last_cap",
802 .data = (void *)&cap_last_cap,
803 .maxlen = sizeof(int),
804 .mode = 0444,
805 .proc_handler = proc_dointvec,
806 },
807 #if defined(CONFIG_LOCKUP_DETECTOR)
808 {
809 .procname = "watchdog",
810 .data = &watchdog_user_enabled,
811 .maxlen = sizeof (int),
812 .mode = 0644,
813 .proc_handler = proc_dowatchdog,
814 .extra1 = &zero,
815 .extra2 = &one,
816 },
817 {
818 .procname = "watchdog_thresh",
819 .data = &watchdog_thresh,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dowatchdog,
823 .extra1 = &zero,
824 .extra2 = &sixty,
825 },
826 {
827 .procname = "softlockup_panic",
828 .data = &softlockup_panic,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec_minmax,
832 .extra1 = &zero,
833 .extra2 = &one,
834 },
835 {
836 .procname = "nmi_watchdog",
837 .data = &watchdog_user_enabled,
838 .maxlen = sizeof (int),
839 .mode = 0644,
840 .proc_handler = proc_dowatchdog,
841 .extra1 = &zero,
842 .extra2 = &one,
843 },
844 #endif
845 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
846 {
847 .procname = "unknown_nmi_panic",
848 .data = &unknown_nmi_panic,
849 .maxlen = sizeof (int),
850 .mode = 0644,
851 .proc_handler = proc_dointvec,
852 },
853 #endif
854 #if defined(CONFIG_X86)
855 {
856 .procname = "panic_on_unrecovered_nmi",
857 .data = &panic_on_unrecovered_nmi,
858 .maxlen = sizeof(int),
859 .mode = 0644,
860 .proc_handler = proc_dointvec,
861 },
862 {
863 .procname = "panic_on_io_nmi",
864 .data = &panic_on_io_nmi,
865 .maxlen = sizeof(int),
866 .mode = 0644,
867 .proc_handler = proc_dointvec,
868 },
869 #ifdef CONFIG_DEBUG_STACKOVERFLOW
870 {
871 .procname = "panic_on_stackoverflow",
872 .data = &sysctl_panic_on_stackoverflow,
873 .maxlen = sizeof(int),
874 .mode = 0644,
875 .proc_handler = proc_dointvec,
876 },
877 #endif
878 {
879 .procname = "bootloader_type",
880 .data = &bootloader_type,
881 .maxlen = sizeof (int),
882 .mode = 0444,
883 .proc_handler = proc_dointvec,
884 },
885 {
886 .procname = "bootloader_version",
887 .data = &bootloader_version,
888 .maxlen = sizeof (int),
889 .mode = 0444,
890 .proc_handler = proc_dointvec,
891 },
892 {
893 .procname = "kstack_depth_to_print",
894 .data = &kstack_depth_to_print,
895 .maxlen = sizeof(int),
896 .mode = 0644,
897 .proc_handler = proc_dointvec,
898 },
899 {
900 .procname = "io_delay_type",
901 .data = &io_delay_type,
902 .maxlen = sizeof(int),
903 .mode = 0644,
904 .proc_handler = proc_dointvec,
905 },
906 #endif
907 #if defined(CONFIG_MMU)
908 {
909 .procname = "randomize_va_space",
910 .data = &randomize_va_space,
911 .maxlen = sizeof(int),
912 .mode = 0644,
913 .proc_handler = proc_dointvec,
914 },
915 #endif
916 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
917 {
918 .procname = "spin_retry",
919 .data = &spin_retry,
920 .maxlen = sizeof (int),
921 .mode = 0644,
922 .proc_handler = proc_dointvec,
923 },
924 #endif
925 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
926 {
927 .procname = "acpi_video_flags",
928 .data = &acpi_realmode_flags,
929 .maxlen = sizeof (unsigned long),
930 .mode = 0644,
931 .proc_handler = proc_doulongvec_minmax,
932 },
933 #endif
934 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
935 {
936 .procname = "ignore-unaligned-usertrap",
937 .data = &no_unaligned_warning,
938 .maxlen = sizeof (int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec,
941 },
942 #endif
943 #ifdef CONFIG_IA64
944 {
945 .procname = "unaligned-dump-stack",
946 .data = &unaligned_dump_stack,
947 .maxlen = sizeof (int),
948 .mode = 0644,
949 .proc_handler = proc_dointvec,
950 },
951 #endif
952 #ifdef CONFIG_DETECT_HUNG_TASK
953 {
954 .procname = "hung_task_panic",
955 .data = &sysctl_hung_task_panic,
956 .maxlen = sizeof(int),
957 .mode = 0644,
958 .proc_handler = proc_dointvec_minmax,
959 .extra1 = &zero,
960 .extra2 = &one,
961 },
962 {
963 .procname = "hung_task_check_count",
964 .data = &sysctl_hung_task_check_count,
965 .maxlen = sizeof(int),
966 .mode = 0644,
967 .proc_handler = proc_dointvec_minmax,
968 .extra1 = &zero,
969 },
970 {
971 .procname = "hung_task_timeout_secs",
972 .data = &sysctl_hung_task_timeout_secs,
973 .maxlen = sizeof(unsigned long),
974 .mode = 0644,
975 .proc_handler = proc_dohung_task_timeout_secs,
976 },
977 {
978 .procname = "hung_task_warnings",
979 .data = &sysctl_hung_task_warnings,
980 .maxlen = sizeof(unsigned long),
981 .mode = 0644,
982 .proc_handler = proc_doulongvec_minmax,
983 },
984 #endif
985 #ifdef CONFIG_COMPAT
986 {
987 .procname = "compat-log",
988 .data = &compat_log,
989 .maxlen = sizeof (int),
990 .mode = 0644,
991 .proc_handler = proc_dointvec,
992 },
993 #endif
994 #ifdef CONFIG_RT_MUTEXES
995 {
996 .procname = "max_lock_depth",
997 .data = &max_lock_depth,
998 .maxlen = sizeof(int),
999 .mode = 0644,
1000 .proc_handler = proc_dointvec,
1001 },
1002 #endif
1003 {
1004 .procname = "poweroff_cmd",
1005 .data = &poweroff_cmd,
1006 .maxlen = POWEROFF_CMD_PATH_LEN,
1007 .mode = 0644,
1008 .proc_handler = proc_dostring,
1009 },
1010 #ifdef CONFIG_KEYS
1011 {
1012 .procname = "keys",
1013 .mode = 0555,
1014 .child = key_sysctls,
1015 },
1016 #endif
1017 #ifdef CONFIG_RCU_TORTURE_TEST
1018 {
1019 .procname = "rcutorture_runnable",
1020 .data = &rcutorture_runnable,
1021 .maxlen = sizeof(int),
1022 .mode = 0644,
1023 .proc_handler = proc_dointvec,
1024 },
1025 #endif
1026 #ifdef CONFIG_PERF_EVENTS
1027 /*
1028 * User-space scripts rely on the existence of this file
1029 * as a feature check for perf_events being enabled.
1030 *
1031 * So it's an ABI, do not remove!
1032 */
1033 {
1034 .procname = "perf_event_paranoid",
1035 .data = &sysctl_perf_event_paranoid,
1036 .maxlen = sizeof(sysctl_perf_event_paranoid),
1037 .mode = 0644,
1038 .proc_handler = proc_dointvec,
1039 },
1040 {
1041 .procname = "perf_event_mlock_kb",
1042 .data = &sysctl_perf_event_mlock,
1043 .maxlen = sizeof(sysctl_perf_event_mlock),
1044 .mode = 0644,
1045 .proc_handler = proc_dointvec,
1046 },
1047 {
1048 .procname = "perf_event_max_sample_rate",
1049 .data = &sysctl_perf_event_sample_rate,
1050 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1051 .mode = 0644,
1052 .proc_handler = perf_proc_update_handler,
1053 },
1054 {
1055 .procname = "perf_cpu_time_max_percent",
1056 .data = &sysctl_perf_cpu_time_max_percent,
1057 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1058 .mode = 0644,
1059 .proc_handler = perf_cpu_time_max_percent_handler,
1060 .extra1 = &zero,
1061 .extra2 = &one_hundred,
1062 },
1063 #endif
1064 #ifdef CONFIG_KMEMCHECK
1065 {
1066 .procname = "kmemcheck",
1067 .data = &kmemcheck_enabled,
1068 .maxlen = sizeof(int),
1069 .mode = 0644,
1070 .proc_handler = proc_dointvec,
1071 },
1072 #endif
1073 #ifdef CONFIG_BLOCK
1074 {
1075 .procname = "blk_iopoll",
1076 .data = &blk_iopoll_enabled,
1077 .maxlen = sizeof(int),
1078 .mode = 0644,
1079 .proc_handler = proc_dointvec,
1080 },
1081 #endif
1082 { }
1083 };
1084
1085 static struct ctl_table vm_table[] = {
1086 {
1087 .procname = "overcommit_memory",
1088 .data = &sysctl_overcommit_memory,
1089 .maxlen = sizeof(sysctl_overcommit_memory),
1090 .mode = 0644,
1091 .proc_handler = proc_dointvec_minmax,
1092 .extra1 = &zero,
1093 .extra2 = &two,
1094 },
1095 {
1096 .procname = "panic_on_oom",
1097 .data = &sysctl_panic_on_oom,
1098 .maxlen = sizeof(sysctl_panic_on_oom),
1099 .mode = 0644,
1100 .proc_handler = proc_dointvec_minmax,
1101 .extra1 = &zero,
1102 .extra2 = &two,
1103 },
1104 {
1105 .procname = "oom_kill_allocating_task",
1106 .data = &sysctl_oom_kill_allocating_task,
1107 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec,
1110 },
1111 {
1112 .procname = "oom_dump_tasks",
1113 .data = &sysctl_oom_dump_tasks,
1114 .maxlen = sizeof(sysctl_oom_dump_tasks),
1115 .mode = 0644,
1116 .proc_handler = proc_dointvec,
1117 },
1118 {
1119 .procname = "overcommit_ratio",
1120 .data = &sysctl_overcommit_ratio,
1121 .maxlen = sizeof(sysctl_overcommit_ratio),
1122 .mode = 0644,
1123 .proc_handler = proc_dointvec,
1124 },
1125 {
1126 .procname = "page-cluster",
1127 .data = &page_cluster,
1128 .maxlen = sizeof(int),
1129 .mode = 0644,
1130 .proc_handler = proc_dointvec_minmax,
1131 .extra1 = &zero,
1132 },
1133 {
1134 .procname = "dirty_background_ratio",
1135 .data = &dirty_background_ratio,
1136 .maxlen = sizeof(dirty_background_ratio),
1137 .mode = 0644,
1138 .proc_handler = dirty_background_ratio_handler,
1139 .extra1 = &zero,
1140 .extra2 = &one_hundred,
1141 },
1142 {
1143 .procname = "dirty_background_bytes",
1144 .data = &dirty_background_bytes,
1145 .maxlen = sizeof(dirty_background_bytes),
1146 .mode = 0644,
1147 .proc_handler = dirty_background_bytes_handler,
1148 .extra1 = &one_ul,
1149 },
1150 {
1151 .procname = "dirty_ratio",
1152 .data = &vm_dirty_ratio,
1153 .maxlen = sizeof(vm_dirty_ratio),
1154 .mode = 0644,
1155 .proc_handler = dirty_ratio_handler,
1156 .extra1 = &zero,
1157 .extra2 = &one_hundred,
1158 },
1159 {
1160 .procname = "dirty_bytes",
1161 .data = &vm_dirty_bytes,
1162 .maxlen = sizeof(vm_dirty_bytes),
1163 .mode = 0644,
1164 .proc_handler = dirty_bytes_handler,
1165 .extra1 = &dirty_bytes_min,
1166 },
1167 {
1168 .procname = "dirty_writeback_centisecs",
1169 .data = &dirty_writeback_interval,
1170 .maxlen = sizeof(dirty_writeback_interval),
1171 .mode = 0644,
1172 .proc_handler = dirty_writeback_centisecs_handler,
1173 },
1174 {
1175 .procname = "dirty_expire_centisecs",
1176 .data = &dirty_expire_interval,
1177 .maxlen = sizeof(dirty_expire_interval),
1178 .mode = 0644,
1179 .proc_handler = proc_dointvec_minmax,
1180 .extra1 = &zero,
1181 },
1182 {
1183 .procname = "nr_pdflush_threads",
1184 .mode = 0444 /* read-only */,
1185 .proc_handler = pdflush_proc_obsolete,
1186 },
1187 {
1188 .procname = "swappiness",
1189 .data = &vm_swappiness,
1190 .maxlen = sizeof(vm_swappiness),
1191 .mode = 0644,
1192 .proc_handler = proc_dointvec_minmax,
1193 .extra1 = &zero,
1194 .extra2 = &one_hundred,
1195 },
1196 #ifdef CONFIG_HUGETLB_PAGE
1197 {
1198 .procname = "nr_hugepages",
1199 .data = NULL,
1200 .maxlen = sizeof(unsigned long),
1201 .mode = 0644,
1202 .proc_handler = hugetlb_sysctl_handler,
1203 .extra1 = (void *)&hugetlb_zero,
1204 .extra2 = (void *)&hugetlb_infinity,
1205 },
1206 #ifdef CONFIG_NUMA
1207 {
1208 .procname = "nr_hugepages_mempolicy",
1209 .data = NULL,
1210 .maxlen = sizeof(unsigned long),
1211 .mode = 0644,
1212 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1213 .extra1 = (void *)&hugetlb_zero,
1214 .extra2 = (void *)&hugetlb_infinity,
1215 },
1216 #endif
1217 {
1218 .procname = "hugetlb_shm_group",
1219 .data = &sysctl_hugetlb_shm_group,
1220 .maxlen = sizeof(gid_t),
1221 .mode = 0644,
1222 .proc_handler = proc_dointvec,
1223 },
1224 {
1225 .procname = "hugepages_treat_as_movable",
1226 .data = &hugepages_treat_as_movable,
1227 .maxlen = sizeof(int),
1228 .mode = 0644,
1229 .proc_handler = proc_dointvec,
1230 },
1231 {
1232 .procname = "nr_overcommit_hugepages",
1233 .data = NULL,
1234 .maxlen = sizeof(unsigned long),
1235 .mode = 0644,
1236 .proc_handler = hugetlb_overcommit_handler,
1237 .extra1 = (void *)&hugetlb_zero,
1238 .extra2 = (void *)&hugetlb_infinity,
1239 },
1240 #endif
1241 {
1242 .procname = "lowmem_reserve_ratio",
1243 .data = &sysctl_lowmem_reserve_ratio,
1244 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1245 .mode = 0644,
1246 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1247 },
1248 {
1249 .procname = "drop_caches",
1250 .data = &sysctl_drop_caches,
1251 .maxlen = sizeof(int),
1252 .mode = 0644,
1253 .proc_handler = drop_caches_sysctl_handler,
1254 .extra1 = &one,
1255 .extra2 = &three,
1256 },
1257 #ifdef CONFIG_COMPACTION
1258 {
1259 .procname = "compact_memory",
1260 .data = &sysctl_compact_memory,
1261 .maxlen = sizeof(int),
1262 .mode = 0200,
1263 .proc_handler = sysctl_compaction_handler,
1264 },
1265 {
1266 .procname = "extfrag_threshold",
1267 .data = &sysctl_extfrag_threshold,
1268 .maxlen = sizeof(int),
1269 .mode = 0644,
1270 .proc_handler = sysctl_extfrag_handler,
1271 .extra1 = &min_extfrag_threshold,
1272 .extra2 = &max_extfrag_threshold,
1273 },
1274
1275 #endif /* CONFIG_COMPACTION */
1276 {
1277 .procname = "min_free_kbytes",
1278 .data = &min_free_kbytes,
1279 .maxlen = sizeof(min_free_kbytes),
1280 .mode = 0644,
1281 .proc_handler = min_free_kbytes_sysctl_handler,
1282 .extra1 = &zero,
1283 },
1284 {
1285 .procname = "percpu_pagelist_fraction",
1286 .data = &percpu_pagelist_fraction,
1287 .maxlen = sizeof(percpu_pagelist_fraction),
1288 .mode = 0644,
1289 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1290 .extra1 = &min_percpu_pagelist_fract,
1291 },
1292 #ifdef CONFIG_MMU
1293 {
1294 .procname = "max_map_count",
1295 .data = &sysctl_max_map_count,
1296 .maxlen = sizeof(sysctl_max_map_count),
1297 .mode = 0644,
1298 .proc_handler = proc_dointvec_minmax,
1299 .extra1 = &zero,
1300 },
1301 #else
1302 {
1303 .procname = "nr_trim_pages",
1304 .data = &sysctl_nr_trim_pages,
1305 .maxlen = sizeof(sysctl_nr_trim_pages),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec_minmax,
1308 .extra1 = &zero,
1309 },
1310 #endif
1311 {
1312 .procname = "laptop_mode",
1313 .data = &laptop_mode,
1314 .maxlen = sizeof(laptop_mode),
1315 .mode = 0644,
1316 .proc_handler = proc_dointvec_jiffies,
1317 },
1318 {
1319 .procname = "block_dump",
1320 .data = &block_dump,
1321 .maxlen = sizeof(block_dump),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec,
1324 .extra1 = &zero,
1325 },
1326 {
1327 .procname = "vfs_cache_pressure",
1328 .data = &sysctl_vfs_cache_pressure,
1329 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1330 .mode = 0644,
1331 .proc_handler = proc_dointvec,
1332 .extra1 = &zero,
1333 },
1334 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1335 {
1336 .procname = "legacy_va_layout",
1337 .data = &sysctl_legacy_va_layout,
1338 .maxlen = sizeof(sysctl_legacy_va_layout),
1339 .mode = 0644,
1340 .proc_handler = proc_dointvec,
1341 .extra1 = &zero,
1342 },
1343 #endif
1344 #ifdef CONFIG_NUMA
1345 {
1346 .procname = "zone_reclaim_mode",
1347 .data = &zone_reclaim_mode,
1348 .maxlen = sizeof(zone_reclaim_mode),
1349 .mode = 0644,
1350 .proc_handler = proc_dointvec,
1351 .extra1 = &zero,
1352 },
1353 {
1354 .procname = "min_unmapped_ratio",
1355 .data = &sysctl_min_unmapped_ratio,
1356 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1357 .mode = 0644,
1358 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1359 .extra1 = &zero,
1360 .extra2 = &one_hundred,
1361 },
1362 {
1363 .procname = "min_slab_ratio",
1364 .data = &sysctl_min_slab_ratio,
1365 .maxlen = sizeof(sysctl_min_slab_ratio),
1366 .mode = 0644,
1367 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1368 .extra1 = &zero,
1369 .extra2 = &one_hundred,
1370 },
1371 #endif
1372 #ifdef CONFIG_SMP
1373 {
1374 .procname = "stat_interval",
1375 .data = &sysctl_stat_interval,
1376 .maxlen = sizeof(sysctl_stat_interval),
1377 .mode = 0644,
1378 .proc_handler = proc_dointvec_jiffies,
1379 },
1380 #endif
1381 #ifdef CONFIG_MMU
1382 {
1383 .procname = "mmap_min_addr",
1384 .data = &dac_mmap_min_addr,
1385 .maxlen = sizeof(unsigned long),
1386 .mode = 0644,
1387 .proc_handler = mmap_min_addr_handler,
1388 },
1389 #endif
1390 #ifdef CONFIG_NUMA
1391 {
1392 .procname = "numa_zonelist_order",
1393 .data = &numa_zonelist_order,
1394 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1395 .mode = 0644,
1396 .proc_handler = numa_zonelist_order_handler,
1397 },
1398 #endif
1399 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1400 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1401 {
1402 .procname = "vdso_enabled",
1403 .data = &vdso_enabled,
1404 .maxlen = sizeof(vdso_enabled),
1405 .mode = 0644,
1406 .proc_handler = proc_dointvec,
1407 .extra1 = &zero,
1408 },
1409 #endif
1410 #ifdef CONFIG_HIGHMEM
1411 {
1412 .procname = "highmem_is_dirtyable",
1413 .data = &vm_highmem_is_dirtyable,
1414 .maxlen = sizeof(vm_highmem_is_dirtyable),
1415 .mode = 0644,
1416 .proc_handler = proc_dointvec_minmax,
1417 .extra1 = &zero,
1418 .extra2 = &one,
1419 },
1420 #endif
1421 {
1422 .procname = "scan_unevictable_pages",
1423 .data = &scan_unevictable_pages,
1424 .maxlen = sizeof(scan_unevictable_pages),
1425 .mode = 0644,
1426 .proc_handler = scan_unevictable_handler,
1427 },
1428 #ifdef CONFIG_MEMORY_FAILURE
1429 {
1430 .procname = "memory_failure_early_kill",
1431 .data = &sysctl_memory_failure_early_kill,
1432 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1433 .mode = 0644,
1434 .proc_handler = proc_dointvec_minmax,
1435 .extra1 = &zero,
1436 .extra2 = &one,
1437 },
1438 {
1439 .procname = "memory_failure_recovery",
1440 .data = &sysctl_memory_failure_recovery,
1441 .maxlen = sizeof(sysctl_memory_failure_recovery),
1442 .mode = 0644,
1443 .proc_handler = proc_dointvec_minmax,
1444 .extra1 = &zero,
1445 .extra2 = &one,
1446 },
1447 #endif
1448 {
1449 .procname = "user_reserve_kbytes",
1450 .data = &sysctl_user_reserve_kbytes,
1451 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1452 .mode = 0644,
1453 .proc_handler = proc_doulongvec_minmax,
1454 },
1455 {
1456 .procname = "admin_reserve_kbytes",
1457 .data = &sysctl_admin_reserve_kbytes,
1458 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1459 .mode = 0644,
1460 .proc_handler = proc_doulongvec_minmax,
1461 },
1462 { }
1463 };
1464
1465 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1466 static struct ctl_table binfmt_misc_table[] = {
1467 { }
1468 };
1469 #endif
1470
1471 static struct ctl_table fs_table[] = {
1472 {
1473 .procname = "inode-nr",
1474 .data = &inodes_stat,
1475 .maxlen = 2*sizeof(long),
1476 .mode = 0444,
1477 .proc_handler = proc_nr_inodes,
1478 },
1479 {
1480 .procname = "inode-state",
1481 .data = &inodes_stat,
1482 .maxlen = 7*sizeof(long),
1483 .mode = 0444,
1484 .proc_handler = proc_nr_inodes,
1485 },
1486 {
1487 .procname = "file-nr",
1488 .data = &files_stat,
1489 .maxlen = sizeof(files_stat),
1490 .mode = 0444,
1491 .proc_handler = proc_nr_files,
1492 },
1493 {
1494 .procname = "file-max",
1495 .data = &files_stat.max_files,
1496 .maxlen = sizeof(files_stat.max_files),
1497 .mode = 0644,
1498 .proc_handler = proc_doulongvec_minmax,
1499 },
1500 {
1501 .procname = "nr_open",
1502 .data = &sysctl_nr_open,
1503 .maxlen = sizeof(int),
1504 .mode = 0644,
1505 .proc_handler = proc_dointvec_minmax,
1506 .extra1 = &sysctl_nr_open_min,
1507 .extra2 = &sysctl_nr_open_max,
1508 },
1509 {
1510 .procname = "dentry-state",
1511 .data = &dentry_stat,
1512 .maxlen = 6*sizeof(long),
1513 .mode = 0444,
1514 .proc_handler = proc_nr_dentry,
1515 },
1516 {
1517 .procname = "overflowuid",
1518 .data = &fs_overflowuid,
1519 .maxlen = sizeof(int),
1520 .mode = 0644,
1521 .proc_handler = proc_dointvec_minmax,
1522 .extra1 = &minolduid,
1523 .extra2 = &maxolduid,
1524 },
1525 {
1526 .procname = "overflowgid",
1527 .data = &fs_overflowgid,
1528 .maxlen = sizeof(int),
1529 .mode = 0644,
1530 .proc_handler = proc_dointvec_minmax,
1531 .extra1 = &minolduid,
1532 .extra2 = &maxolduid,
1533 },
1534 #ifdef CONFIG_FILE_LOCKING
1535 {
1536 .procname = "leases-enable",
1537 .data = &leases_enable,
1538 .maxlen = sizeof(int),
1539 .mode = 0644,
1540 .proc_handler = proc_dointvec,
1541 },
1542 #endif
1543 #ifdef CONFIG_DNOTIFY
1544 {
1545 .procname = "dir-notify-enable",
1546 .data = &dir_notify_enable,
1547 .maxlen = sizeof(int),
1548 .mode = 0644,
1549 .proc_handler = proc_dointvec,
1550 },
1551 #endif
1552 #ifdef CONFIG_MMU
1553 #ifdef CONFIG_FILE_LOCKING
1554 {
1555 .procname = "lease-break-time",
1556 .data = &lease_break_time,
1557 .maxlen = sizeof(int),
1558 .mode = 0644,
1559 .proc_handler = proc_dointvec,
1560 },
1561 #endif
1562 #ifdef CONFIG_AIO
1563 {
1564 .procname = "aio-nr",
1565 .data = &aio_nr,
1566 .maxlen = sizeof(aio_nr),
1567 .mode = 0444,
1568 .proc_handler = proc_doulongvec_minmax,
1569 },
1570 {
1571 .procname = "aio-max-nr",
1572 .data = &aio_max_nr,
1573 .maxlen = sizeof(aio_max_nr),
1574 .mode = 0644,
1575 .proc_handler = proc_doulongvec_minmax,
1576 },
1577 #endif /* CONFIG_AIO */
1578 #ifdef CONFIG_INOTIFY_USER
1579 {
1580 .procname = "inotify",
1581 .mode = 0555,
1582 .child = inotify_table,
1583 },
1584 #endif
1585 #ifdef CONFIG_EPOLL
1586 {
1587 .procname = "epoll",
1588 .mode = 0555,
1589 .child = epoll_table,
1590 },
1591 #endif
1592 #endif
1593 {
1594 .procname = "protected_symlinks",
1595 .data = &sysctl_protected_symlinks,
1596 .maxlen = sizeof(int),
1597 .mode = 0600,
1598 .proc_handler = proc_dointvec_minmax,
1599 .extra1 = &zero,
1600 .extra2 = &one,
1601 },
1602 {
1603 .procname = "protected_hardlinks",
1604 .data = &sysctl_protected_hardlinks,
1605 .maxlen = sizeof(int),
1606 .mode = 0600,
1607 .proc_handler = proc_dointvec_minmax,
1608 .extra1 = &zero,
1609 .extra2 = &one,
1610 },
1611 {
1612 .procname = "suid_dumpable",
1613 .data = &suid_dumpable,
1614 .maxlen = sizeof(int),
1615 .mode = 0644,
1616 .proc_handler = proc_dointvec_minmax_coredump,
1617 .extra1 = &zero,
1618 .extra2 = &two,
1619 },
1620 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1621 {
1622 .procname = "binfmt_misc",
1623 .mode = 0555,
1624 .child = binfmt_misc_table,
1625 },
1626 #endif
1627 {
1628 .procname = "pipe-max-size",
1629 .data = &pipe_max_size,
1630 .maxlen = sizeof(int),
1631 .mode = 0644,
1632 .proc_handler = &pipe_proc_fn,
1633 .extra1 = &pipe_min_size,
1634 },
1635 { }
1636 };
1637
1638 static struct ctl_table debug_table[] = {
1639 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1640 {
1641 .procname = "exception-trace",
1642 .data = &show_unhandled_signals,
1643 .maxlen = sizeof(int),
1644 .mode = 0644,
1645 .proc_handler = proc_dointvec
1646 },
1647 #endif
1648 #if defined(CONFIG_OPTPROBES)
1649 {
1650 .procname = "kprobes-optimization",
1651 .data = &sysctl_kprobes_optimization,
1652 .maxlen = sizeof(int),
1653 .mode = 0644,
1654 .proc_handler = proc_kprobes_optimization_handler,
1655 .extra1 = &zero,
1656 .extra2 = &one,
1657 },
1658 #endif
1659 { }
1660 };
1661
1662 static struct ctl_table dev_table[] = {
1663 { }
1664 };
1665
1666 int __init sysctl_init(void)
1667 {
1668 struct ctl_table_header *hdr;
1669
1670 hdr = register_sysctl_table(sysctl_base_table);
1671 kmemleak_not_leak(hdr);
1672 return 0;
1673 }
1674
1675 #endif /* CONFIG_SYSCTL */
1676
1677 /*
1678 * /proc/sys support
1679 */
1680
1681 #ifdef CONFIG_PROC_SYSCTL
1682
1683 static int _proc_do_string(void* data, int maxlen, int write,
1684 void __user *buffer,
1685 size_t *lenp, loff_t *ppos)
1686 {
1687 size_t len;
1688 char __user *p;
1689 char c;
1690
1691 if (!data || !maxlen || !*lenp) {
1692 *lenp = 0;
1693 return 0;
1694 }
1695
1696 if (write) {
1697 len = 0;
1698 p = buffer;
1699 while (len < *lenp) {
1700 if (get_user(c, p++))
1701 return -EFAULT;
1702 if (c == 0 || c == '\n')
1703 break;
1704 len++;
1705 }
1706 if (len >= maxlen)
1707 len = maxlen-1;
1708 if(copy_from_user(data, buffer, len))
1709 return -EFAULT;
1710 ((char *) data)[len] = 0;
1711 *ppos += *lenp;
1712 } else {
1713 len = strlen(data);
1714 if (len > maxlen)
1715 len = maxlen;
1716
1717 if (*ppos > len) {
1718 *lenp = 0;
1719 return 0;
1720 }
1721
1722 data += *ppos;
1723 len -= *ppos;
1724
1725 if (len > *lenp)
1726 len = *lenp;
1727 if (len)
1728 if(copy_to_user(buffer, data, len))
1729 return -EFAULT;
1730 if (len < *lenp) {
1731 if(put_user('\n', ((char __user *) buffer) + len))
1732 return -EFAULT;
1733 len++;
1734 }
1735 *lenp = len;
1736 *ppos += len;
1737 }
1738 return 0;
1739 }
1740
1741 /**
1742 * proc_dostring - read a string sysctl
1743 * @table: the sysctl table
1744 * @write: %TRUE if this is a write to the sysctl file
1745 * @buffer: the user buffer
1746 * @lenp: the size of the user buffer
1747 * @ppos: file position
1748 *
1749 * Reads/writes a string from/to the user buffer. If the kernel
1750 * buffer provided is not large enough to hold the string, the
1751 * string is truncated. The copied string is %NULL-terminated.
1752 * If the string is being read by the user process, it is copied
1753 * and a newline '\n' is added. It is truncated if the buffer is
1754 * not large enough.
1755 *
1756 * Returns 0 on success.
1757 */
1758 int proc_dostring(struct ctl_table *table, int write,
1759 void __user *buffer, size_t *lenp, loff_t *ppos)
1760 {
1761 return _proc_do_string(table->data, table->maxlen, write,
1762 buffer, lenp, ppos);
1763 }
1764
1765 static size_t proc_skip_spaces(char **buf)
1766 {
1767 size_t ret;
1768 char *tmp = skip_spaces(*buf);
1769 ret = tmp - *buf;
1770 *buf = tmp;
1771 return ret;
1772 }
1773
1774 static void proc_skip_char(char **buf, size_t *size, const char v)
1775 {
1776 while (*size) {
1777 if (**buf != v)
1778 break;
1779 (*size)--;
1780 (*buf)++;
1781 }
1782 }
1783
1784 #define TMPBUFLEN 22
1785 /**
1786 * proc_get_long - reads an ASCII formatted integer from a user buffer
1787 *
1788 * @buf: a kernel buffer
1789 * @size: size of the kernel buffer
1790 * @val: this is where the number will be stored
1791 * @neg: set to %TRUE if number is negative
1792 * @perm_tr: a vector which contains the allowed trailers
1793 * @perm_tr_len: size of the perm_tr vector
1794 * @tr: pointer to store the trailer character
1795 *
1796 * In case of success %0 is returned and @buf and @size are updated with
1797 * the amount of bytes read. If @tr is non-NULL and a trailing
1798 * character exists (size is non-zero after returning from this
1799 * function), @tr is updated with the trailing character.
1800 */
1801 static int proc_get_long(char **buf, size_t *size,
1802 unsigned long *val, bool *neg,
1803 const char *perm_tr, unsigned perm_tr_len, char *tr)
1804 {
1805 int len;
1806 char *p, tmp[TMPBUFLEN];
1807
1808 if (!*size)
1809 return -EINVAL;
1810
1811 len = *size;
1812 if (len > TMPBUFLEN - 1)
1813 len = TMPBUFLEN - 1;
1814
1815 memcpy(tmp, *buf, len);
1816
1817 tmp[len] = 0;
1818 p = tmp;
1819 if (*p == '-' && *size > 1) {
1820 *neg = true;
1821 p++;
1822 } else
1823 *neg = false;
1824 if (!isdigit(*p))
1825 return -EINVAL;
1826
1827 *val = simple_strtoul(p, &p, 0);
1828
1829 len = p - tmp;
1830
1831 /* We don't know if the next char is whitespace thus we may accept
1832 * invalid integers (e.g. 1234...a) or two integers instead of one
1833 * (e.g. 123...1). So lets not allow such large numbers. */
1834 if (len == TMPBUFLEN - 1)
1835 return -EINVAL;
1836
1837 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1838 return -EINVAL;
1839
1840 if (tr && (len < *size))
1841 *tr = *p;
1842
1843 *buf += len;
1844 *size -= len;
1845
1846 return 0;
1847 }
1848
1849 /**
1850 * proc_put_long - converts an integer to a decimal ASCII formatted string
1851 *
1852 * @buf: the user buffer
1853 * @size: the size of the user buffer
1854 * @val: the integer to be converted
1855 * @neg: sign of the number, %TRUE for negative
1856 *
1857 * In case of success %0 is returned and @buf and @size are updated with
1858 * the amount of bytes written.
1859 */
1860 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1861 bool neg)
1862 {
1863 int len;
1864 char tmp[TMPBUFLEN], *p = tmp;
1865
1866 sprintf(p, "%s%lu", neg ? "-" : "", val);
1867 len = strlen(tmp);
1868 if (len > *size)
1869 len = *size;
1870 if (copy_to_user(*buf, tmp, len))
1871 return -EFAULT;
1872 *size -= len;
1873 *buf += len;
1874 return 0;
1875 }
1876 #undef TMPBUFLEN
1877
1878 static int proc_put_char(void __user **buf, size_t *size, char c)
1879 {
1880 if (*size) {
1881 char __user **buffer = (char __user **)buf;
1882 if (put_user(c, *buffer))
1883 return -EFAULT;
1884 (*size)--, (*buffer)++;
1885 *buf = *buffer;
1886 }
1887 return 0;
1888 }
1889
1890 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1891 int *valp,
1892 int write, void *data)
1893 {
1894 if (write) {
1895 *valp = *negp ? -*lvalp : *lvalp;
1896 } else {
1897 int val = *valp;
1898 if (val < 0) {
1899 *negp = true;
1900 *lvalp = (unsigned long)-val;
1901 } else {
1902 *negp = false;
1903 *lvalp = (unsigned long)val;
1904 }
1905 }
1906 return 0;
1907 }
1908
1909 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1910
1911 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1912 int write, void __user *buffer,
1913 size_t *lenp, loff_t *ppos,
1914 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1915 int write, void *data),
1916 void *data)
1917 {
1918 int *i, vleft, first = 1, err = 0;
1919 unsigned long page = 0;
1920 size_t left;
1921 char *kbuf;
1922
1923 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1924 *lenp = 0;
1925 return 0;
1926 }
1927
1928 i = (int *) tbl_data;
1929 vleft = table->maxlen / sizeof(*i);
1930 left = *lenp;
1931
1932 if (!conv)
1933 conv = do_proc_dointvec_conv;
1934
1935 if (write) {
1936 if (left > PAGE_SIZE - 1)
1937 left = PAGE_SIZE - 1;
1938 page = __get_free_page(GFP_TEMPORARY);
1939 kbuf = (char *) page;
1940 if (!kbuf)
1941 return -ENOMEM;
1942 if (copy_from_user(kbuf, buffer, left)) {
1943 err = -EFAULT;
1944 goto free;
1945 }
1946 kbuf[left] = 0;
1947 }
1948
1949 for (; left && vleft--; i++, first=0) {
1950 unsigned long lval;
1951 bool neg;
1952
1953 if (write) {
1954 left -= proc_skip_spaces(&kbuf);
1955
1956 if (!left)
1957 break;
1958 err = proc_get_long(&kbuf, &left, &lval, &neg,
1959 proc_wspace_sep,
1960 sizeof(proc_wspace_sep), NULL);
1961 if (err)
1962 break;
1963 if (conv(&neg, &lval, i, 1, data)) {
1964 err = -EINVAL;
1965 break;
1966 }
1967 } else {
1968 if (conv(&neg, &lval, i, 0, data)) {
1969 err = -EINVAL;
1970 break;
1971 }
1972 if (!first)
1973 err = proc_put_char(&buffer, &left, '\t');
1974 if (err)
1975 break;
1976 err = proc_put_long(&buffer, &left, lval, neg);
1977 if (err)
1978 break;
1979 }
1980 }
1981
1982 if (!write && !first && left && !err)
1983 err = proc_put_char(&buffer, &left, '\n');
1984 if (write && !err && left)
1985 left -= proc_skip_spaces(&kbuf);
1986 free:
1987 if (write) {
1988 free_page(page);
1989 if (first)
1990 return err ? : -EINVAL;
1991 }
1992 *lenp -= left;
1993 *ppos += *lenp;
1994 return err;
1995 }
1996
1997 static int do_proc_dointvec(struct ctl_table *table, int write,
1998 void __user *buffer, size_t *lenp, loff_t *ppos,
1999 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2000 int write, void *data),
2001 void *data)
2002 {
2003 return __do_proc_dointvec(table->data, table, write,
2004 buffer, lenp, ppos, conv, data);
2005 }
2006
2007 /**
2008 * proc_dointvec - read a vector of integers
2009 * @table: the sysctl table
2010 * @write: %TRUE if this is a write to the sysctl file
2011 * @buffer: the user buffer
2012 * @lenp: the size of the user buffer
2013 * @ppos: file position
2014 *
2015 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2016 * values from/to the user buffer, treated as an ASCII string.
2017 *
2018 * Returns 0 on success.
2019 */
2020 int proc_dointvec(struct ctl_table *table, int write,
2021 void __user *buffer, size_t *lenp, loff_t *ppos)
2022 {
2023 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2024 NULL,NULL);
2025 }
2026
2027 /*
2028 * Taint values can only be increased
2029 * This means we can safely use a temporary.
2030 */
2031 static int proc_taint(struct ctl_table *table, int write,
2032 void __user *buffer, size_t *lenp, loff_t *ppos)
2033 {
2034 struct ctl_table t;
2035 unsigned long tmptaint = get_taint();
2036 int err;
2037
2038 if (write && !capable(CAP_SYS_ADMIN))
2039 return -EPERM;
2040
2041 t = *table;
2042 t.data = &tmptaint;
2043 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2044 if (err < 0)
2045 return err;
2046
2047 if (write) {
2048 /*
2049 * Poor man's atomic or. Not worth adding a primitive
2050 * to everyone's atomic.h for this
2051 */
2052 int i;
2053 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2054 if ((tmptaint >> i) & 1)
2055 add_taint(i, LOCKDEP_STILL_OK);
2056 }
2057 }
2058
2059 return err;
2060 }
2061
2062 #ifdef CONFIG_PRINTK
2063 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2064 void __user *buffer, size_t *lenp, loff_t *ppos)
2065 {
2066 if (write && !capable(CAP_SYS_ADMIN))
2067 return -EPERM;
2068
2069 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2070 }
2071 #endif
2072
2073 struct do_proc_dointvec_minmax_conv_param {
2074 int *min;
2075 int *max;
2076 };
2077
2078 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2079 int *valp,
2080 int write, void *data)
2081 {
2082 struct do_proc_dointvec_minmax_conv_param *param = data;
2083 if (write) {
2084 int val = *negp ? -*lvalp : *lvalp;
2085 if ((param->min && *param->min > val) ||
2086 (param->max && *param->max < val))
2087 return -EINVAL;
2088 *valp = val;
2089 } else {
2090 int val = *valp;
2091 if (val < 0) {
2092 *negp = true;
2093 *lvalp = (unsigned long)-val;
2094 } else {
2095 *negp = false;
2096 *lvalp = (unsigned long)val;
2097 }
2098 }
2099 return 0;
2100 }
2101
2102 /**
2103 * proc_dointvec_minmax - read a vector of integers with min/max values
2104 * @table: the sysctl table
2105 * @write: %TRUE if this is a write to the sysctl file
2106 * @buffer: the user buffer
2107 * @lenp: the size of the user buffer
2108 * @ppos: file position
2109 *
2110 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2111 * values from/to the user buffer, treated as an ASCII string.
2112 *
2113 * This routine will ensure the values are within the range specified by
2114 * table->extra1 (min) and table->extra2 (max).
2115 *
2116 * Returns 0 on success.
2117 */
2118 int proc_dointvec_minmax(struct ctl_table *table, int write,
2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2120 {
2121 struct do_proc_dointvec_minmax_conv_param param = {
2122 .min = (int *) table->extra1,
2123 .max = (int *) table->extra2,
2124 };
2125 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2126 do_proc_dointvec_minmax_conv, &param);
2127 }
2128
2129 static void validate_coredump_safety(void)
2130 {
2131 #ifdef CONFIG_COREDUMP
2132 if (suid_dumpable == SUID_DUMP_ROOT &&
2133 core_pattern[0] != '/' && core_pattern[0] != '|') {
2134 printk(KERN_WARNING "Unsafe core_pattern used with "\
2135 "suid_dumpable=2. Pipe handler or fully qualified "\
2136 "core dump path required.\n");
2137 }
2138 #endif
2139 }
2140
2141 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2142 void __user *buffer, size_t *lenp, loff_t *ppos)
2143 {
2144 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2145 if (!error)
2146 validate_coredump_safety();
2147 return error;
2148 }
2149
2150 #ifdef CONFIG_COREDUMP
2151 static int proc_dostring_coredump(struct ctl_table *table, int write,
2152 void __user *buffer, size_t *lenp, loff_t *ppos)
2153 {
2154 int error = proc_dostring(table, write, buffer, lenp, ppos);
2155 if (!error)
2156 validate_coredump_safety();
2157 return error;
2158 }
2159 #endif
2160
2161 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2162 void __user *buffer,
2163 size_t *lenp, loff_t *ppos,
2164 unsigned long convmul,
2165 unsigned long convdiv)
2166 {
2167 unsigned long *i, *min, *max;
2168 int vleft, first = 1, err = 0;
2169 unsigned long page = 0;
2170 size_t left;
2171 char *kbuf;
2172
2173 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2174 *lenp = 0;
2175 return 0;
2176 }
2177
2178 i = (unsigned long *) data;
2179 min = (unsigned long *) table->extra1;
2180 max = (unsigned long *) table->extra2;
2181 vleft = table->maxlen / sizeof(unsigned long);
2182 left = *lenp;
2183
2184 if (write) {
2185 if (left > PAGE_SIZE - 1)
2186 left = PAGE_SIZE - 1;
2187 page = __get_free_page(GFP_TEMPORARY);
2188 kbuf = (char *) page;
2189 if (!kbuf)
2190 return -ENOMEM;
2191 if (copy_from_user(kbuf, buffer, left)) {
2192 err = -EFAULT;
2193 goto free;
2194 }
2195 kbuf[left] = 0;
2196 }
2197
2198 for (; left && vleft--; i++, first = 0) {
2199 unsigned long val;
2200
2201 if (write) {
2202 bool neg;
2203
2204 left -= proc_skip_spaces(&kbuf);
2205
2206 err = proc_get_long(&kbuf, &left, &val, &neg,
2207 proc_wspace_sep,
2208 sizeof(proc_wspace_sep), NULL);
2209 if (err)
2210 break;
2211 if (neg)
2212 continue;
2213 if ((min && val < *min) || (max && val > *max))
2214 continue;
2215 *i = val;
2216 } else {
2217 val = convdiv * (*i) / convmul;
2218 if (!first)
2219 err = proc_put_char(&buffer, &left, '\t');
2220 err = proc_put_long(&buffer, &left, val, false);
2221 if (err)
2222 break;
2223 }
2224 }
2225
2226 if (!write && !first && left && !err)
2227 err = proc_put_char(&buffer, &left, '\n');
2228 if (write && !err)
2229 left -= proc_skip_spaces(&kbuf);
2230 free:
2231 if (write) {
2232 free_page(page);
2233 if (first)
2234 return err ? : -EINVAL;
2235 }
2236 *lenp -= left;
2237 *ppos += *lenp;
2238 return err;
2239 }
2240
2241 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2242 void __user *buffer,
2243 size_t *lenp, loff_t *ppos,
2244 unsigned long convmul,
2245 unsigned long convdiv)
2246 {
2247 return __do_proc_doulongvec_minmax(table->data, table, write,
2248 buffer, lenp, ppos, convmul, convdiv);
2249 }
2250
2251 /**
2252 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2253 * @table: the sysctl table
2254 * @write: %TRUE if this is a write to the sysctl file
2255 * @buffer: the user buffer
2256 * @lenp: the size of the user buffer
2257 * @ppos: file position
2258 *
2259 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2260 * values from/to the user buffer, treated as an ASCII string.
2261 *
2262 * This routine will ensure the values are within the range specified by
2263 * table->extra1 (min) and table->extra2 (max).
2264 *
2265 * Returns 0 on success.
2266 */
2267 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2268 void __user *buffer, size_t *lenp, loff_t *ppos)
2269 {
2270 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2271 }
2272
2273 /**
2274 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2275 * @table: the sysctl table
2276 * @write: %TRUE if this is a write to the sysctl file
2277 * @buffer: the user buffer
2278 * @lenp: the size of the user buffer
2279 * @ppos: file position
2280 *
2281 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2282 * values from/to the user buffer, treated as an ASCII string. The values
2283 * are treated as milliseconds, and converted to jiffies when they are stored.
2284 *
2285 * This routine will ensure the values are within the range specified by
2286 * table->extra1 (min) and table->extra2 (max).
2287 *
2288 * Returns 0 on success.
2289 */
2290 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2291 void __user *buffer,
2292 size_t *lenp, loff_t *ppos)
2293 {
2294 return do_proc_doulongvec_minmax(table, write, buffer,
2295 lenp, ppos, HZ, 1000l);
2296 }
2297
2298
2299 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2300 int *valp,
2301 int write, void *data)
2302 {
2303 if (write) {
2304 if (*lvalp > LONG_MAX / HZ)
2305 return 1;
2306 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2307 } else {
2308 int val = *valp;
2309 unsigned long lval;
2310 if (val < 0) {
2311 *negp = true;
2312 lval = (unsigned long)-val;
2313 } else {
2314 *negp = false;
2315 lval = (unsigned long)val;
2316 }
2317 *lvalp = lval / HZ;
2318 }
2319 return 0;
2320 }
2321
2322 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2323 int *valp,
2324 int write, void *data)
2325 {
2326 if (write) {
2327 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2328 return 1;
2329 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2330 } else {
2331 int val = *valp;
2332 unsigned long lval;
2333 if (val < 0) {
2334 *negp = true;
2335 lval = (unsigned long)-val;
2336 } else {
2337 *negp = false;
2338 lval = (unsigned long)val;
2339 }
2340 *lvalp = jiffies_to_clock_t(lval);
2341 }
2342 return 0;
2343 }
2344
2345 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2346 int *valp,
2347 int write, void *data)
2348 {
2349 if (write) {
2350 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2351
2352 if (jif > INT_MAX)
2353 return 1;
2354 *valp = (int)jif;
2355 } else {
2356 int val = *valp;
2357 unsigned long lval;
2358 if (val < 0) {
2359 *negp = true;
2360 lval = (unsigned long)-val;
2361 } else {
2362 *negp = false;
2363 lval = (unsigned long)val;
2364 }
2365 *lvalp = jiffies_to_msecs(lval);
2366 }
2367 return 0;
2368 }
2369
2370 /**
2371 * proc_dointvec_jiffies - read a vector of integers as seconds
2372 * @table: the sysctl table
2373 * @write: %TRUE if this is a write to the sysctl file
2374 * @buffer: the user buffer
2375 * @lenp: the size of the user buffer
2376 * @ppos: file position
2377 *
2378 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2379 * values from/to the user buffer, treated as an ASCII string.
2380 * The values read are assumed to be in seconds, and are converted into
2381 * jiffies.
2382 *
2383 * Returns 0 on success.
2384 */
2385 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2386 void __user *buffer, size_t *lenp, loff_t *ppos)
2387 {
2388 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2389 do_proc_dointvec_jiffies_conv,NULL);
2390 }
2391
2392 /**
2393 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2394 * @table: the sysctl table
2395 * @write: %TRUE if this is a write to the sysctl file
2396 * @buffer: the user buffer
2397 * @lenp: the size of the user buffer
2398 * @ppos: pointer to the file position
2399 *
2400 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2401 * values from/to the user buffer, treated as an ASCII string.
2402 * The values read are assumed to be in 1/USER_HZ seconds, and
2403 * are converted into jiffies.
2404 *
2405 * Returns 0 on success.
2406 */
2407 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2408 void __user *buffer, size_t *lenp, loff_t *ppos)
2409 {
2410 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2411 do_proc_dointvec_userhz_jiffies_conv,NULL);
2412 }
2413
2414 /**
2415 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2416 * @table: the sysctl table
2417 * @write: %TRUE if this is a write to the sysctl file
2418 * @buffer: the user buffer
2419 * @lenp: the size of the user buffer
2420 * @ppos: file position
2421 * @ppos: the current position in the file
2422 *
2423 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2424 * values from/to the user buffer, treated as an ASCII string.
2425 * The values read are assumed to be in 1/1000 seconds, and
2426 * are converted into jiffies.
2427 *
2428 * Returns 0 on success.
2429 */
2430 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2431 void __user *buffer, size_t *lenp, loff_t *ppos)
2432 {
2433 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2434 do_proc_dointvec_ms_jiffies_conv, NULL);
2435 }
2436
2437 static int proc_do_cad_pid(struct ctl_table *table, int write,
2438 void __user *buffer, size_t *lenp, loff_t *ppos)
2439 {
2440 struct pid *new_pid;
2441 pid_t tmp;
2442 int r;
2443
2444 tmp = pid_vnr(cad_pid);
2445
2446 r = __do_proc_dointvec(&tmp, table, write, buffer,
2447 lenp, ppos, NULL, NULL);
2448 if (r || !write)
2449 return r;
2450
2451 new_pid = find_get_pid(tmp);
2452 if (!new_pid)
2453 return -ESRCH;
2454
2455 put_pid(xchg(&cad_pid, new_pid));
2456 return 0;
2457 }
2458
2459 /**
2460 * proc_do_large_bitmap - read/write from/to a large bitmap
2461 * @table: the sysctl table
2462 * @write: %TRUE if this is a write to the sysctl file
2463 * @buffer: the user buffer
2464 * @lenp: the size of the user buffer
2465 * @ppos: file position
2466 *
2467 * The bitmap is stored at table->data and the bitmap length (in bits)
2468 * in table->maxlen.
2469 *
2470 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2471 * large bitmaps may be represented in a compact manner. Writing into
2472 * the file will clear the bitmap then update it with the given input.
2473 *
2474 * Returns 0 on success.
2475 */
2476 int proc_do_large_bitmap(struct ctl_table *table, int write,
2477 void __user *buffer, size_t *lenp, loff_t *ppos)
2478 {
2479 int err = 0;
2480 bool first = 1;
2481 size_t left = *lenp;
2482 unsigned long bitmap_len = table->maxlen;
2483 unsigned long *bitmap = (unsigned long *) table->data;
2484 unsigned long *tmp_bitmap = NULL;
2485 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2486
2487 if (!bitmap_len || !left || (*ppos && !write)) {
2488 *lenp = 0;
2489 return 0;
2490 }
2491
2492 if (write) {
2493 unsigned long page = 0;
2494 char *kbuf;
2495
2496 if (left > PAGE_SIZE - 1)
2497 left = PAGE_SIZE - 1;
2498
2499 page = __get_free_page(GFP_TEMPORARY);
2500 kbuf = (char *) page;
2501 if (!kbuf)
2502 return -ENOMEM;
2503 if (copy_from_user(kbuf, buffer, left)) {
2504 free_page(page);
2505 return -EFAULT;
2506 }
2507 kbuf[left] = 0;
2508
2509 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2510 GFP_KERNEL);
2511 if (!tmp_bitmap) {
2512 free_page(page);
2513 return -ENOMEM;
2514 }
2515 proc_skip_char(&kbuf, &left, '\n');
2516 while (!err && left) {
2517 unsigned long val_a, val_b;
2518 bool neg;
2519
2520 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2521 sizeof(tr_a), &c);
2522 if (err)
2523 break;
2524 if (val_a >= bitmap_len || neg) {
2525 err = -EINVAL;
2526 break;
2527 }
2528
2529 val_b = val_a;
2530 if (left) {
2531 kbuf++;
2532 left--;
2533 }
2534
2535 if (c == '-') {
2536 err = proc_get_long(&kbuf, &left, &val_b,
2537 &neg, tr_b, sizeof(tr_b),
2538 &c);
2539 if (err)
2540 break;
2541 if (val_b >= bitmap_len || neg ||
2542 val_a > val_b) {
2543 err = -EINVAL;
2544 break;
2545 }
2546 if (left) {
2547 kbuf++;
2548 left--;
2549 }
2550 }
2551
2552 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2553 first = 0;
2554 proc_skip_char(&kbuf, &left, '\n');
2555 }
2556 free_page(page);
2557 } else {
2558 unsigned long bit_a, bit_b = 0;
2559
2560 while (left) {
2561 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2562 if (bit_a >= bitmap_len)
2563 break;
2564 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2565 bit_a + 1) - 1;
2566
2567 if (!first) {
2568 err = proc_put_char(&buffer, &left, ',');
2569 if (err)
2570 break;
2571 }
2572 err = proc_put_long(&buffer, &left, bit_a, false);
2573 if (err)
2574 break;
2575 if (bit_a != bit_b) {
2576 err = proc_put_char(&buffer, &left, '-');
2577 if (err)
2578 break;
2579 err = proc_put_long(&buffer, &left, bit_b, false);
2580 if (err)
2581 break;
2582 }
2583
2584 first = 0; bit_b++;
2585 }
2586 if (!err)
2587 err = proc_put_char(&buffer, &left, '\n');
2588 }
2589
2590 if (!err) {
2591 if (write) {
2592 if (*ppos)
2593 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2594 else
2595 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2596 }
2597 kfree(tmp_bitmap);
2598 *lenp -= left;
2599 *ppos += *lenp;
2600 return 0;
2601 } else {
2602 kfree(tmp_bitmap);
2603 return err;
2604 }
2605 }
2606
2607 #else /* CONFIG_PROC_SYSCTL */
2608
2609 int proc_dostring(struct ctl_table *table, int write,
2610 void __user *buffer, size_t *lenp, loff_t *ppos)
2611 {
2612 return -ENOSYS;
2613 }
2614
2615 int proc_dointvec(struct ctl_table *table, int write,
2616 void __user *buffer, size_t *lenp, loff_t *ppos)
2617 {
2618 return -ENOSYS;
2619 }
2620
2621 int proc_dointvec_minmax(struct ctl_table *table, int write,
2622 void __user *buffer, size_t *lenp, loff_t *ppos)
2623 {
2624 return -ENOSYS;
2625 }
2626
2627 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2628 void __user *buffer, size_t *lenp, loff_t *ppos)
2629 {
2630 return -ENOSYS;
2631 }
2632
2633 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2634 void __user *buffer, size_t *lenp, loff_t *ppos)
2635 {
2636 return -ENOSYS;
2637 }
2638
2639 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2640 void __user *buffer, size_t *lenp, loff_t *ppos)
2641 {
2642 return -ENOSYS;
2643 }
2644
2645 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2646 void __user *buffer, size_t *lenp, loff_t *ppos)
2647 {
2648 return -ENOSYS;
2649 }
2650
2651 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2652 void __user *buffer,
2653 size_t *lenp, loff_t *ppos)
2654 {
2655 return -ENOSYS;
2656 }
2657
2658
2659 #endif /* CONFIG_PROC_SYSCTL */
2660
2661 /*
2662 * No sense putting this after each symbol definition, twice,
2663 * exception granted :-)
2664 */
2665 EXPORT_SYMBOL(proc_dointvec);
2666 EXPORT_SYMBOL(proc_dointvec_jiffies);
2667 EXPORT_SYMBOL(proc_dointvec_minmax);
2668 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2669 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2670 EXPORT_SYMBOL(proc_dostring);
2671 EXPORT_SYMBOL(proc_doulongvec_minmax);
2672 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux kernel - Deliverables
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