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5b0f18c12800ee79f588764b241d42ecfeb969a4
[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 static int neg_one = -1;
124 #endif
125
126 static int zero;
127 static int __maybe_unused one = 1;
128 static int __maybe_unused two = 2;
129 static int __maybe_unused three = 3;
130 static unsigned long one_ul = 1;
131 static int one_hundred = 100;
132 #ifdef CONFIG_PRINTK
133 static int ten_thousand = 10000;
134 #endif
135
136 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
137 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
138
139 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
140 static int maxolduid = 65535;
141 static int minolduid;
142 static int min_percpu_pagelist_fract = 8;
143
144 static int ngroups_max = NGROUPS_MAX;
145 static const int cap_last_cap = CAP_LAST_CAP;
146
147 #ifdef CONFIG_INOTIFY_USER
148 #include <linux/inotify.h>
149 #endif
150 #ifdef CONFIG_SPARC
151 #endif
152
153 #ifdef CONFIG_SPARC64
154 extern int sysctl_tsb_ratio;
155 #endif
156
157 #ifdef __hppa__
158 extern int pwrsw_enabled;
159 #endif
160
161 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
162 extern int unaligned_enabled;
163 #endif
164
165 #ifdef CONFIG_IA64
166 extern int unaligned_dump_stack;
167 #endif
168
169 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
170 extern int no_unaligned_warning;
171 #endif
172
173 #ifdef CONFIG_PROC_SYSCTL
174 static int proc_do_cad_pid(struct ctl_table *table, int write,
175 void __user *buffer, size_t *lenp, loff_t *ppos);
176 static int proc_taint(struct ctl_table *table, int write,
177 void __user *buffer, size_t *lenp, loff_t *ppos);
178 #endif
179
180 #ifdef CONFIG_PRINTK
181 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
182 void __user *buffer, size_t *lenp, loff_t *ppos);
183 #endif
184
185 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
186 void __user *buffer, size_t *lenp, loff_t *ppos);
187 #ifdef CONFIG_COREDUMP
188 static int proc_dostring_coredump(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
190 #endif
191
192 #ifdef CONFIG_MAGIC_SYSRQ
193 /* Note: sysrq code uses it's own private copy */
194 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
195
196 static int sysrq_sysctl_handler(ctl_table *table, int write,
197 void __user *buffer, size_t *lenp,
198 loff_t *ppos)
199 {
200 int error;
201
202 error = proc_dointvec(table, write, buffer, lenp, ppos);
203 if (error)
204 return error;
205
206 if (write)
207 sysrq_toggle_support(__sysrq_enabled);
208
209 return 0;
210 }
211
212 #endif
213
214 static struct ctl_table kern_table[];
215 static struct ctl_table vm_table[];
216 static struct ctl_table fs_table[];
217 static struct ctl_table debug_table[];
218 static struct ctl_table dev_table[];
219 extern struct ctl_table random_table[];
220 #ifdef CONFIG_EPOLL
221 extern struct ctl_table epoll_table[];
222 #endif
223
224 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
225 int sysctl_legacy_va_layout;
226 #endif
227
228 /* The default sysctl tables: */
229
230 static struct ctl_table sysctl_base_table[] = {
231 {
232 .procname = "kernel",
233 .mode = 0555,
234 .child = kern_table,
235 },
236 {
237 .procname = "vm",
238 .mode = 0555,
239 .child = vm_table,
240 },
241 {
242 .procname = "fs",
243 .mode = 0555,
244 .child = fs_table,
245 },
246 {
247 .procname = "debug",
248 .mode = 0555,
249 .child = debug_table,
250 },
251 {
252 .procname = "dev",
253 .mode = 0555,
254 .child = dev_table,
255 },
256 { }
257 };
258
259 #ifdef CONFIG_SCHED_DEBUG
260 static int min_sched_granularity_ns = 100000; /* 100 usecs */
261 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
262 static int min_wakeup_granularity_ns; /* 0 usecs */
263 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
264 #ifdef CONFIG_SMP
265 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
266 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
267 #endif /* CONFIG_SMP */
268 #endif /* CONFIG_SCHED_DEBUG */
269
270 #ifdef CONFIG_COMPACTION
271 static int min_extfrag_threshold;
272 static int max_extfrag_threshold = 1000;
273 #endif
274
275 static struct ctl_table kern_table[] = {
276 {
277 .procname = "sched_child_runs_first",
278 .data = &sysctl_sched_child_runs_first,
279 .maxlen = sizeof(unsigned int),
280 .mode = 0644,
281 .proc_handler = proc_dointvec,
282 },
283 #ifdef CONFIG_SCHED_DEBUG
284 {
285 .procname = "sched_min_granularity_ns",
286 .data = &sysctl_sched_min_granularity,
287 .maxlen = sizeof(unsigned int),
288 .mode = 0644,
289 .proc_handler = sched_proc_update_handler,
290 .extra1 = &min_sched_granularity_ns,
291 .extra2 = &max_sched_granularity_ns,
292 },
293 {
294 .procname = "sched_latency_ns",
295 .data = &sysctl_sched_latency,
296 .maxlen = sizeof(unsigned int),
297 .mode = 0644,
298 .proc_handler = sched_proc_update_handler,
299 .extra1 = &min_sched_granularity_ns,
300 .extra2 = &max_sched_granularity_ns,
301 },
302 {
303 .procname = "sched_wakeup_granularity_ns",
304 .data = &sysctl_sched_wakeup_granularity,
305 .maxlen = sizeof(unsigned int),
306 .mode = 0644,
307 .proc_handler = sched_proc_update_handler,
308 .extra1 = &min_wakeup_granularity_ns,
309 .extra2 = &max_wakeup_granularity_ns,
310 },
311 #ifdef CONFIG_SMP
312 {
313 .procname = "sched_tunable_scaling",
314 .data = &sysctl_sched_tunable_scaling,
315 .maxlen = sizeof(enum sched_tunable_scaling),
316 .mode = 0644,
317 .proc_handler = sched_proc_update_handler,
318 .extra1 = &min_sched_tunable_scaling,
319 .extra2 = &max_sched_tunable_scaling,
320 },
321 {
322 .procname = "sched_migration_cost_ns",
323 .data = &sysctl_sched_migration_cost,
324 .maxlen = sizeof(unsigned int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec,
327 },
328 {
329 .procname = "sched_nr_migrate",
330 .data = &sysctl_sched_nr_migrate,
331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
333 .proc_handler = proc_dointvec,
334 },
335 {
336 .procname = "sched_time_avg_ms",
337 .data = &sysctl_sched_time_avg,
338 .maxlen = sizeof(unsigned int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec,
341 },
342 {
343 .procname = "sched_shares_window_ns",
344 .data = &sysctl_sched_shares_window,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec,
348 },
349 {
350 .procname = "timer_migration",
351 .data = &sysctl_timer_migration,
352 .maxlen = sizeof(unsigned int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec_minmax,
355 .extra1 = &zero,
356 .extra2 = &one,
357 },
358 #endif /* CONFIG_SMP */
359 #ifdef CONFIG_NUMA_BALANCING
360 {
361 .procname = "numa_balancing_scan_delay_ms",
362 .data = &sysctl_numa_balancing_scan_delay,
363 .maxlen = sizeof(unsigned int),
364 .mode = 0644,
365 .proc_handler = proc_dointvec,
366 },
367 {
368 .procname = "numa_balancing_scan_period_min_ms",
369 .data = &sysctl_numa_balancing_scan_period_min,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec,
373 },
374 {
375 .procname = "numa_balancing_scan_period_reset",
376 .data = &sysctl_numa_balancing_scan_period_reset,
377 .maxlen = sizeof(unsigned int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec,
380 },
381 {
382 .procname = "numa_balancing_scan_period_max_ms",
383 .data = &sysctl_numa_balancing_scan_period_max,
384 .maxlen = sizeof(unsigned int),
385 .mode = 0644,
386 .proc_handler = proc_dointvec,
387 },
388 {
389 .procname = "numa_balancing_scan_size_mb",
390 .data = &sysctl_numa_balancing_scan_size,
391 .maxlen = sizeof(unsigned int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec,
394 },
395 #endif /* CONFIG_NUMA_BALANCING */
396 #endif /* CONFIG_SCHED_DEBUG */
397 {
398 .procname = "sched_rt_period_us",
399 .data = &sysctl_sched_rt_period,
400 .maxlen = sizeof(unsigned int),
401 .mode = 0644,
402 .proc_handler = sched_rt_handler,
403 },
404 {
405 .procname = "sched_rt_runtime_us",
406 .data = &sysctl_sched_rt_runtime,
407 .maxlen = sizeof(int),
408 .mode = 0644,
409 .proc_handler = sched_rt_handler,
410 },
411 {
412 .procname = "sched_rr_timeslice_ms",
413 .data = &sched_rr_timeslice,
414 .maxlen = sizeof(int),
415 .mode = 0644,
416 .proc_handler = sched_rr_handler,
417 },
418 #ifdef CONFIG_SCHED_AUTOGROUP
419 {
420 .procname = "sched_autogroup_enabled",
421 .data = &sysctl_sched_autogroup_enabled,
422 .maxlen = sizeof(unsigned int),
423 .mode = 0644,
424 .proc_handler = proc_dointvec_minmax,
425 .extra1 = &zero,
426 .extra2 = &one,
427 },
428 #endif
429 #ifdef CONFIG_CFS_BANDWIDTH
430 {
431 .procname = "sched_cfs_bandwidth_slice_us",
432 .data = &sysctl_sched_cfs_bandwidth_slice,
433 .maxlen = sizeof(unsigned int),
434 .mode = 0644,
435 .proc_handler = proc_dointvec_minmax,
436 .extra1 = &one,
437 },
438 #endif
439 #ifdef CONFIG_PROVE_LOCKING
440 {
441 .procname = "prove_locking",
442 .data = &prove_locking,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = proc_dointvec,
446 },
447 #endif
448 #ifdef CONFIG_LOCK_STAT
449 {
450 .procname = "lock_stat",
451 .data = &lock_stat,
452 .maxlen = sizeof(int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec,
455 },
456 #endif
457 {
458 .procname = "panic",
459 .data = &panic_timeout,
460 .maxlen = sizeof(int),
461 .mode = 0644,
462 .proc_handler = proc_dointvec,
463 },
464 #ifdef CONFIG_COREDUMP
465 {
466 .procname = "core_uses_pid",
467 .data = &core_uses_pid,
468 .maxlen = sizeof(int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec,
471 },
472 {
473 .procname = "core_pattern",
474 .data = core_pattern,
475 .maxlen = CORENAME_MAX_SIZE,
476 .mode = 0644,
477 .proc_handler = proc_dostring_coredump,
478 },
479 {
480 .procname = "core_pipe_limit",
481 .data = &core_pipe_limit,
482 .maxlen = sizeof(unsigned int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 #endif
487 #ifdef CONFIG_PROC_SYSCTL
488 {
489 .procname = "tainted",
490 .maxlen = sizeof(long),
491 .mode = 0644,
492 .proc_handler = proc_taint,
493 },
494 #endif
495 #ifdef CONFIG_LATENCYTOP
496 {
497 .procname = "latencytop",
498 .data = &latencytop_enabled,
499 .maxlen = sizeof(int),
500 .mode = 0644,
501 .proc_handler = proc_dointvec,
502 },
503 #endif
504 #ifdef CONFIG_BLK_DEV_INITRD
505 {
506 .procname = "real-root-dev",
507 .data = &real_root_dev,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec,
511 },
512 #endif
513 {
514 .procname = "print-fatal-signals",
515 .data = &print_fatal_signals,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec,
519 },
520 #ifdef CONFIG_SPARC
521 {
522 .procname = "reboot-cmd",
523 .data = reboot_command,
524 .maxlen = 256,
525 .mode = 0644,
526 .proc_handler = proc_dostring,
527 },
528 {
529 .procname = "stop-a",
530 .data = &stop_a_enabled,
531 .maxlen = sizeof (int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec,
534 },
535 {
536 .procname = "scons-poweroff",
537 .data = &scons_pwroff,
538 .maxlen = sizeof (int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 #endif
543 #ifdef CONFIG_SPARC64
544 {
545 .procname = "tsb-ratio",
546 .data = &sysctl_tsb_ratio,
547 .maxlen = sizeof (int),
548 .mode = 0644,
549 .proc_handler = proc_dointvec,
550 },
551 #endif
552 #ifdef __hppa__
553 {
554 .procname = "soft-power",
555 .data = &pwrsw_enabled,
556 .maxlen = sizeof (int),
557 .mode = 0644,
558 .proc_handler = proc_dointvec,
559 },
560 #endif
561 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
562 {
563 .procname = "unaligned-trap",
564 .data = &unaligned_enabled,
565 .maxlen = sizeof (int),
566 .mode = 0644,
567 .proc_handler = proc_dointvec,
568 },
569 #endif
570 {
571 .procname = "ctrl-alt-del",
572 .data = &C_A_D,
573 .maxlen = sizeof(int),
574 .mode = 0644,
575 .proc_handler = proc_dointvec,
576 },
577 #ifdef CONFIG_FUNCTION_TRACER
578 {
579 .procname = "ftrace_enabled",
580 .data = &ftrace_enabled,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = ftrace_enable_sysctl,
584 },
585 #endif
586 #ifdef CONFIG_STACK_TRACER
587 {
588 .procname = "stack_tracer_enabled",
589 .data = &stack_tracer_enabled,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = stack_trace_sysctl,
593 },
594 #endif
595 #ifdef CONFIG_TRACING
596 {
597 .procname = "ftrace_dump_on_oops",
598 .data = &ftrace_dump_on_oops,
599 .maxlen = sizeof(int),
600 .mode = 0644,
601 .proc_handler = proc_dointvec,
602 },
603 {
604 .procname = "traceoff_on_warning",
605 .data = &__disable_trace_on_warning,
606 .maxlen = sizeof(__disable_trace_on_warning),
607 .mode = 0644,
608 .proc_handler = proc_dointvec,
609 },
610 #endif
611 #ifdef CONFIG_MODULES
612 {
613 .procname = "modprobe",
614 .data = &modprobe_path,
615 .maxlen = KMOD_PATH_LEN,
616 .mode = 0644,
617 .proc_handler = proc_dostring,
618 },
619 {
620 .procname = "modules_disabled",
621 .data = &modules_disabled,
622 .maxlen = sizeof(int),
623 .mode = 0644,
624 /* only handle a transition from default "0" to "1" */
625 .proc_handler = proc_dointvec_minmax,
626 .extra1 = &one,
627 .extra2 = &one,
628 },
629 #endif
630
631 {
632 .procname = "hotplug",
633 .data = &uevent_helper,
634 .maxlen = UEVENT_HELPER_PATH_LEN,
635 .mode = 0644,
636 .proc_handler = proc_dostring,
637 },
638
639 #ifdef CONFIG_CHR_DEV_SG
640 {
641 .procname = "sg-big-buff",
642 .data = &sg_big_buff,
643 .maxlen = sizeof (int),
644 .mode = 0444,
645 .proc_handler = proc_dointvec,
646 },
647 #endif
648 #ifdef CONFIG_BSD_PROCESS_ACCT
649 {
650 .procname = "acct",
651 .data = &acct_parm,
652 .maxlen = 3*sizeof(int),
653 .mode = 0644,
654 .proc_handler = proc_dointvec,
655 },
656 #endif
657 #ifdef CONFIG_MAGIC_SYSRQ
658 {
659 .procname = "sysrq",
660 .data = &__sysrq_enabled,
661 .maxlen = sizeof (int),
662 .mode = 0644,
663 .proc_handler = sysrq_sysctl_handler,
664 },
665 #endif
666 #ifdef CONFIG_PROC_SYSCTL
667 {
668 .procname = "cad_pid",
669 .data = NULL,
670 .maxlen = sizeof (int),
671 .mode = 0600,
672 .proc_handler = proc_do_cad_pid,
673 },
674 #endif
675 {
676 .procname = "threads-max",
677 .data = &max_threads,
678 .maxlen = sizeof(int),
679 .mode = 0644,
680 .proc_handler = proc_dointvec,
681 },
682 {
683 .procname = "random",
684 .mode = 0555,
685 .child = random_table,
686 },
687 {
688 .procname = "usermodehelper",
689 .mode = 0555,
690 .child = usermodehelper_table,
691 },
692 {
693 .procname = "overflowuid",
694 .data = &overflowuid,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = &minolduid,
699 .extra2 = &maxolduid,
700 },
701 {
702 .procname = "overflowgid",
703 .data = &overflowgid,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 .proc_handler = proc_dointvec_minmax,
707 .extra1 = &minolduid,
708 .extra2 = &maxolduid,
709 },
710 #ifdef CONFIG_S390
711 #ifdef CONFIG_MATHEMU
712 {
713 .procname = "ieee_emulation_warnings",
714 .data = &sysctl_ieee_emulation_warnings,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec,
718 },
719 #endif
720 {
721 .procname = "userprocess_debug",
722 .data = &show_unhandled_signals,
723 .maxlen = sizeof(int),
724 .mode = 0644,
725 .proc_handler = proc_dointvec,
726 },
727 #endif
728 {
729 .procname = "pid_max",
730 .data = &pid_max,
731 .maxlen = sizeof (int),
732 .mode = 0644,
733 .proc_handler = proc_dointvec_minmax,
734 .extra1 = &pid_max_min,
735 .extra2 = &pid_max_max,
736 },
737 {
738 .procname = "panic_on_oops",
739 .data = &panic_on_oops,
740 .maxlen = sizeof(int),
741 .mode = 0644,
742 .proc_handler = proc_dointvec,
743 },
744 #if defined CONFIG_PRINTK
745 {
746 .procname = "printk",
747 .data = &console_loglevel,
748 .maxlen = 4*sizeof(int),
749 .mode = 0644,
750 .proc_handler = proc_dointvec,
751 },
752 {
753 .procname = "printk_ratelimit",
754 .data = &printk_ratelimit_state.interval,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec_jiffies,
758 },
759 {
760 .procname = "printk_ratelimit_burst",
761 .data = &printk_ratelimit_state.burst,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec,
765 },
766 {
767 .procname = "printk_delay",
768 .data = &printk_delay_msec,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec_minmax,
772 .extra1 = &zero,
773 .extra2 = &ten_thousand,
774 },
775 {
776 .procname = "dmesg_restrict",
777 .data = &dmesg_restrict,
778 .maxlen = sizeof(int),
779 .mode = 0644,
780 .proc_handler = proc_dointvec_minmax_sysadmin,
781 .extra1 = &zero,
782 .extra2 = &one,
783 },
784 {
785 .procname = "kptr_restrict",
786 .data = &kptr_restrict,
787 .maxlen = sizeof(int),
788 .mode = 0644,
789 .proc_handler = proc_dointvec_minmax_sysadmin,
790 .extra1 = &zero,
791 .extra2 = &two,
792 },
793 #endif
794 {
795 .procname = "ngroups_max",
796 .data = &ngroups_max,
797 .maxlen = sizeof (int),
798 .mode = 0444,
799 .proc_handler = proc_dointvec,
800 },
801 {
802 .procname = "cap_last_cap",
803 .data = (void *)&cap_last_cap,
804 .maxlen = sizeof(int),
805 .mode = 0444,
806 .proc_handler = proc_dointvec,
807 },
808 #if defined(CONFIG_LOCKUP_DETECTOR)
809 {
810 .procname = "watchdog",
811 .data = &watchdog_enabled,
812 .maxlen = sizeof (int),
813 .mode = 0644,
814 .proc_handler = proc_dowatchdog,
815 .extra1 = &zero,
816 .extra2 = &one,
817 },
818 {
819 .procname = "watchdog_thresh",
820 .data = &watchdog_thresh,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dowatchdog,
824 .extra1 = &neg_one,
825 .extra2 = &sixty,
826 },
827 {
828 .procname = "softlockup_panic",
829 .data = &softlockup_panic,
830 .maxlen = sizeof(int),
831 .mode = 0644,
832 .proc_handler = proc_dointvec_minmax,
833 .extra1 = &zero,
834 .extra2 = &one,
835 },
836 {
837 .procname = "nmi_watchdog",
838 .data = &watchdog_enabled,
839 .maxlen = sizeof (int),
840 .mode = 0644,
841 .proc_handler = proc_dowatchdog,
842 .extra1 = &zero,
843 .extra2 = &one,
844 },
845 #endif
846 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
847 {
848 .procname = "unknown_nmi_panic",
849 .data = &unknown_nmi_panic,
850 .maxlen = sizeof (int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec,
853 },
854 #endif
855 #if defined(CONFIG_X86)
856 {
857 .procname = "panic_on_unrecovered_nmi",
858 .data = &panic_on_unrecovered_nmi,
859 .maxlen = sizeof(int),
860 .mode = 0644,
861 .proc_handler = proc_dointvec,
862 },
863 {
864 .procname = "panic_on_io_nmi",
865 .data = &panic_on_io_nmi,
866 .maxlen = sizeof(int),
867 .mode = 0644,
868 .proc_handler = proc_dointvec,
869 },
870 #ifdef CONFIG_DEBUG_STACKOVERFLOW
871 {
872 .procname = "panic_on_stackoverflow",
873 .data = &sysctl_panic_on_stackoverflow,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = proc_dointvec,
877 },
878 #endif
879 {
880 .procname = "bootloader_type",
881 .data = &bootloader_type,
882 .maxlen = sizeof (int),
883 .mode = 0444,
884 .proc_handler = proc_dointvec,
885 },
886 {
887 .procname = "bootloader_version",
888 .data = &bootloader_version,
889 .maxlen = sizeof (int),
890 .mode = 0444,
891 .proc_handler = proc_dointvec,
892 },
893 {
894 .procname = "kstack_depth_to_print",
895 .data = &kstack_depth_to_print,
896 .maxlen = sizeof(int),
897 .mode = 0644,
898 .proc_handler = proc_dointvec,
899 },
900 {
901 .procname = "io_delay_type",
902 .data = &io_delay_type,
903 .maxlen = sizeof(int),
904 .mode = 0644,
905 .proc_handler = proc_dointvec,
906 },
907 #endif
908 #if defined(CONFIG_MMU)
909 {
910 .procname = "randomize_va_space",
911 .data = &randomize_va_space,
912 .maxlen = sizeof(int),
913 .mode = 0644,
914 .proc_handler = proc_dointvec,
915 },
916 #endif
917 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
918 {
919 .procname = "spin_retry",
920 .data = &spin_retry,
921 .maxlen = sizeof (int),
922 .mode = 0644,
923 .proc_handler = proc_dointvec,
924 },
925 #endif
926 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
927 {
928 .procname = "acpi_video_flags",
929 .data = &acpi_realmode_flags,
930 .maxlen = sizeof (unsigned long),
931 .mode = 0644,
932 .proc_handler = proc_doulongvec_minmax,
933 },
934 #endif
935 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
936 {
937 .procname = "ignore-unaligned-usertrap",
938 .data = &no_unaligned_warning,
939 .maxlen = sizeof (int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec,
942 },
943 #endif
944 #ifdef CONFIG_IA64
945 {
946 .procname = "unaligned-dump-stack",
947 .data = &unaligned_dump_stack,
948 .maxlen = sizeof (int),
949 .mode = 0644,
950 .proc_handler = proc_dointvec,
951 },
952 #endif
953 #ifdef CONFIG_DETECT_HUNG_TASK
954 {
955 .procname = "hung_task_panic",
956 .data = &sysctl_hung_task_panic,
957 .maxlen = sizeof(int),
958 .mode = 0644,
959 .proc_handler = proc_dointvec_minmax,
960 .extra1 = &zero,
961 .extra2 = &one,
962 },
963 {
964 .procname = "hung_task_check_count",
965 .data = &sysctl_hung_task_check_count,
966 .maxlen = sizeof(unsigned long),
967 .mode = 0644,
968 .proc_handler = proc_doulongvec_minmax,
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 #endif
1055 #ifdef CONFIG_KMEMCHECK
1056 {
1057 .procname = "kmemcheck",
1058 .data = &kmemcheck_enabled,
1059 .maxlen = sizeof(int),
1060 .mode = 0644,
1061 .proc_handler = proc_dointvec,
1062 },
1063 #endif
1064 #ifdef CONFIG_BLOCK
1065 {
1066 .procname = "blk_iopoll",
1067 .data = &blk_iopoll_enabled,
1068 .maxlen = sizeof(int),
1069 .mode = 0644,
1070 .proc_handler = proc_dointvec,
1071 },
1072 #endif
1073 { }
1074 };
1075
1076 static struct ctl_table vm_table[] = {
1077 {
1078 .procname = "overcommit_memory",
1079 .data = &sysctl_overcommit_memory,
1080 .maxlen = sizeof(sysctl_overcommit_memory),
1081 .mode = 0644,
1082 .proc_handler = proc_dointvec_minmax,
1083 .extra1 = &zero,
1084 .extra2 = &two,
1085 },
1086 {
1087 .procname = "panic_on_oom",
1088 .data = &sysctl_panic_on_oom,
1089 .maxlen = sizeof(sysctl_panic_on_oom),
1090 .mode = 0644,
1091 .proc_handler = proc_dointvec_minmax,
1092 .extra1 = &zero,
1093 .extra2 = &two,
1094 },
1095 {
1096 .procname = "oom_kill_allocating_task",
1097 .data = &sysctl_oom_kill_allocating_task,
1098 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1099 .mode = 0644,
1100 .proc_handler = proc_dointvec,
1101 },
1102 {
1103 .procname = "oom_dump_tasks",
1104 .data = &sysctl_oom_dump_tasks,
1105 .maxlen = sizeof(sysctl_oom_dump_tasks),
1106 .mode = 0644,
1107 .proc_handler = proc_dointvec,
1108 },
1109 {
1110 .procname = "overcommit_ratio",
1111 .data = &sysctl_overcommit_ratio,
1112 .maxlen = sizeof(sysctl_overcommit_ratio),
1113 .mode = 0644,
1114 .proc_handler = proc_dointvec,
1115 },
1116 {
1117 .procname = "page-cluster",
1118 .data = &page_cluster,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec_minmax,
1122 .extra1 = &zero,
1123 },
1124 {
1125 .procname = "dirty_background_ratio",
1126 .data = &dirty_background_ratio,
1127 .maxlen = sizeof(dirty_background_ratio),
1128 .mode = 0644,
1129 .proc_handler = dirty_background_ratio_handler,
1130 .extra1 = &zero,
1131 .extra2 = &one_hundred,
1132 },
1133 {
1134 .procname = "dirty_background_bytes",
1135 .data = &dirty_background_bytes,
1136 .maxlen = sizeof(dirty_background_bytes),
1137 .mode = 0644,
1138 .proc_handler = dirty_background_bytes_handler,
1139 .extra1 = &one_ul,
1140 },
1141 {
1142 .procname = "dirty_ratio",
1143 .data = &vm_dirty_ratio,
1144 .maxlen = sizeof(vm_dirty_ratio),
1145 .mode = 0644,
1146 .proc_handler = dirty_ratio_handler,
1147 .extra1 = &zero,
1148 .extra2 = &one_hundred,
1149 },
1150 {
1151 .procname = "dirty_bytes",
1152 .data = &vm_dirty_bytes,
1153 .maxlen = sizeof(vm_dirty_bytes),
1154 .mode = 0644,
1155 .proc_handler = dirty_bytes_handler,
1156 .extra1 = &dirty_bytes_min,
1157 },
1158 {
1159 .procname = "dirty_writeback_centisecs",
1160 .data = &dirty_writeback_interval,
1161 .maxlen = sizeof(dirty_writeback_interval),
1162 .mode = 0644,
1163 .proc_handler = dirty_writeback_centisecs_handler,
1164 },
1165 {
1166 .procname = "dirty_expire_centisecs",
1167 .data = &dirty_expire_interval,
1168 .maxlen = sizeof(dirty_expire_interval),
1169 .mode = 0644,
1170 .proc_handler = proc_dointvec_minmax,
1171 .extra1 = &zero,
1172 },
1173 {
1174 .procname = "nr_pdflush_threads",
1175 .mode = 0444 /* read-only */,
1176 .proc_handler = pdflush_proc_obsolete,
1177 },
1178 {
1179 .procname = "swappiness",
1180 .data = &vm_swappiness,
1181 .maxlen = sizeof(vm_swappiness),
1182 .mode = 0644,
1183 .proc_handler = proc_dointvec_minmax,
1184 .extra1 = &zero,
1185 .extra2 = &one_hundred,
1186 },
1187 #ifdef CONFIG_HUGETLB_PAGE
1188 {
1189 .procname = "nr_hugepages",
1190 .data = NULL,
1191 .maxlen = sizeof(unsigned long),
1192 .mode = 0644,
1193 .proc_handler = hugetlb_sysctl_handler,
1194 .extra1 = (void *)&hugetlb_zero,
1195 .extra2 = (void *)&hugetlb_infinity,
1196 },
1197 #ifdef CONFIG_NUMA
1198 {
1199 .procname = "nr_hugepages_mempolicy",
1200 .data = NULL,
1201 .maxlen = sizeof(unsigned long),
1202 .mode = 0644,
1203 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1204 .extra1 = (void *)&hugetlb_zero,
1205 .extra2 = (void *)&hugetlb_infinity,
1206 },
1207 #endif
1208 {
1209 .procname = "hugetlb_shm_group",
1210 .data = &sysctl_hugetlb_shm_group,
1211 .maxlen = sizeof(gid_t),
1212 .mode = 0644,
1213 .proc_handler = proc_dointvec,
1214 },
1215 {
1216 .procname = "hugepages_treat_as_movable",
1217 .data = &hugepages_treat_as_movable,
1218 .maxlen = sizeof(int),
1219 .mode = 0644,
1220 .proc_handler = hugetlb_treat_movable_handler,
1221 },
1222 {
1223 .procname = "nr_overcommit_hugepages",
1224 .data = NULL,
1225 .maxlen = sizeof(unsigned long),
1226 .mode = 0644,
1227 .proc_handler = hugetlb_overcommit_handler,
1228 .extra1 = (void *)&hugetlb_zero,
1229 .extra2 = (void *)&hugetlb_infinity,
1230 },
1231 #endif
1232 {
1233 .procname = "lowmem_reserve_ratio",
1234 .data = &sysctl_lowmem_reserve_ratio,
1235 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1236 .mode = 0644,
1237 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1238 },
1239 {
1240 .procname = "drop_caches",
1241 .data = &sysctl_drop_caches,
1242 .maxlen = sizeof(int),
1243 .mode = 0644,
1244 .proc_handler = drop_caches_sysctl_handler,
1245 .extra1 = &one,
1246 .extra2 = &three,
1247 },
1248 #ifdef CONFIG_COMPACTION
1249 {
1250 .procname = "compact_memory",
1251 .data = &sysctl_compact_memory,
1252 .maxlen = sizeof(int),
1253 .mode = 0200,
1254 .proc_handler = sysctl_compaction_handler,
1255 },
1256 {
1257 .procname = "extfrag_threshold",
1258 .data = &sysctl_extfrag_threshold,
1259 .maxlen = sizeof(int),
1260 .mode = 0644,
1261 .proc_handler = sysctl_extfrag_handler,
1262 .extra1 = &min_extfrag_threshold,
1263 .extra2 = &max_extfrag_threshold,
1264 },
1265
1266 #endif /* CONFIG_COMPACTION */
1267 {
1268 .procname = "min_free_kbytes",
1269 .data = &min_free_kbytes,
1270 .maxlen = sizeof(min_free_kbytes),
1271 .mode = 0644,
1272 .proc_handler = min_free_kbytes_sysctl_handler,
1273 .extra1 = &zero,
1274 },
1275 {
1276 .procname = "percpu_pagelist_fraction",
1277 .data = &percpu_pagelist_fraction,
1278 .maxlen = sizeof(percpu_pagelist_fraction),
1279 .mode = 0644,
1280 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1281 .extra1 = &min_percpu_pagelist_fract,
1282 },
1283 #ifdef CONFIG_MMU
1284 {
1285 .procname = "max_map_count",
1286 .data = &sysctl_max_map_count,
1287 .maxlen = sizeof(sysctl_max_map_count),
1288 .mode = 0644,
1289 .proc_handler = proc_dointvec_minmax,
1290 .extra1 = &zero,
1291 },
1292 #else
1293 {
1294 .procname = "nr_trim_pages",
1295 .data = &sysctl_nr_trim_pages,
1296 .maxlen = sizeof(sysctl_nr_trim_pages),
1297 .mode = 0644,
1298 .proc_handler = proc_dointvec_minmax,
1299 .extra1 = &zero,
1300 },
1301 #endif
1302 {
1303 .procname = "laptop_mode",
1304 .data = &laptop_mode,
1305 .maxlen = sizeof(laptop_mode),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec_jiffies,
1308 },
1309 {
1310 .procname = "block_dump",
1311 .data = &block_dump,
1312 .maxlen = sizeof(block_dump),
1313 .mode = 0644,
1314 .proc_handler = proc_dointvec,
1315 .extra1 = &zero,
1316 },
1317 {
1318 .procname = "vfs_cache_pressure",
1319 .data = &sysctl_vfs_cache_pressure,
1320 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1321 .mode = 0644,
1322 .proc_handler = proc_dointvec,
1323 .extra1 = &zero,
1324 },
1325 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1326 {
1327 .procname = "legacy_va_layout",
1328 .data = &sysctl_legacy_va_layout,
1329 .maxlen = sizeof(sysctl_legacy_va_layout),
1330 .mode = 0644,
1331 .proc_handler = proc_dointvec,
1332 .extra1 = &zero,
1333 },
1334 #endif
1335 #ifdef CONFIG_NUMA
1336 {
1337 .procname = "zone_reclaim_mode",
1338 .data = &zone_reclaim_mode,
1339 .maxlen = sizeof(zone_reclaim_mode),
1340 .mode = 0644,
1341 .proc_handler = proc_dointvec,
1342 .extra1 = &zero,
1343 },
1344 {
1345 .procname = "min_unmapped_ratio",
1346 .data = &sysctl_min_unmapped_ratio,
1347 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1348 .mode = 0644,
1349 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1350 .extra1 = &zero,
1351 .extra2 = &one_hundred,
1352 },
1353 {
1354 .procname = "min_slab_ratio",
1355 .data = &sysctl_min_slab_ratio,
1356 .maxlen = sizeof(sysctl_min_slab_ratio),
1357 .mode = 0644,
1358 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1359 .extra1 = &zero,
1360 .extra2 = &one_hundred,
1361 },
1362 #endif
1363 #ifdef CONFIG_SMP
1364 {
1365 .procname = "stat_interval",
1366 .data = &sysctl_stat_interval,
1367 .maxlen = sizeof(sysctl_stat_interval),
1368 .mode = 0644,
1369 .proc_handler = proc_dointvec_jiffies,
1370 },
1371 #endif
1372 #ifdef CONFIG_MMU
1373 {
1374 .procname = "mmap_min_addr",
1375 .data = &dac_mmap_min_addr,
1376 .maxlen = sizeof(unsigned long),
1377 .mode = 0644,
1378 .proc_handler = mmap_min_addr_handler,
1379 },
1380 #endif
1381 #ifdef CONFIG_NUMA
1382 {
1383 .procname = "numa_zonelist_order",
1384 .data = &numa_zonelist_order,
1385 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1386 .mode = 0644,
1387 .proc_handler = numa_zonelist_order_handler,
1388 },
1389 #endif
1390 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1391 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1392 {
1393 .procname = "vdso_enabled",
1394 .data = &vdso_enabled,
1395 .maxlen = sizeof(vdso_enabled),
1396 .mode = 0644,
1397 .proc_handler = proc_dointvec,
1398 .extra1 = &zero,
1399 },
1400 #endif
1401 #ifdef CONFIG_HIGHMEM
1402 {
1403 .procname = "highmem_is_dirtyable",
1404 .data = &vm_highmem_is_dirtyable,
1405 .maxlen = sizeof(vm_highmem_is_dirtyable),
1406 .mode = 0644,
1407 .proc_handler = proc_dointvec_minmax,
1408 .extra1 = &zero,
1409 .extra2 = &one,
1410 },
1411 #endif
1412 {
1413 .procname = "scan_unevictable_pages",
1414 .data = &scan_unevictable_pages,
1415 .maxlen = sizeof(scan_unevictable_pages),
1416 .mode = 0644,
1417 .proc_handler = scan_unevictable_handler,
1418 },
1419 #ifdef CONFIG_MEMORY_FAILURE
1420 {
1421 .procname = "memory_failure_early_kill",
1422 .data = &sysctl_memory_failure_early_kill,
1423 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1424 .mode = 0644,
1425 .proc_handler = proc_dointvec_minmax,
1426 .extra1 = &zero,
1427 .extra2 = &one,
1428 },
1429 {
1430 .procname = "memory_failure_recovery",
1431 .data = &sysctl_memory_failure_recovery,
1432 .maxlen = sizeof(sysctl_memory_failure_recovery),
1433 .mode = 0644,
1434 .proc_handler = proc_dointvec_minmax,
1435 .extra1 = &zero,
1436 .extra2 = &one,
1437 },
1438 #endif
1439 {
1440 .procname = "user_reserve_kbytes",
1441 .data = &sysctl_user_reserve_kbytes,
1442 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1443 .mode = 0644,
1444 .proc_handler = proc_doulongvec_minmax,
1445 },
1446 {
1447 .procname = "admin_reserve_kbytes",
1448 .data = &sysctl_admin_reserve_kbytes,
1449 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1450 .mode = 0644,
1451 .proc_handler = proc_doulongvec_minmax,
1452 },
1453 { }
1454 };
1455
1456 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1457 static struct ctl_table binfmt_misc_table[] = {
1458 { }
1459 };
1460 #endif
1461
1462 static struct ctl_table fs_table[] = {
1463 {
1464 .procname = "inode-nr",
1465 .data = &inodes_stat,
1466 .maxlen = 2*sizeof(int),
1467 .mode = 0444,
1468 .proc_handler = proc_nr_inodes,
1469 },
1470 {
1471 .procname = "inode-state",
1472 .data = &inodes_stat,
1473 .maxlen = 7*sizeof(int),
1474 .mode = 0444,
1475 .proc_handler = proc_nr_inodes,
1476 },
1477 {
1478 .procname = "file-nr",
1479 .data = &files_stat,
1480 .maxlen = sizeof(files_stat),
1481 .mode = 0444,
1482 .proc_handler = proc_nr_files,
1483 },
1484 {
1485 .procname = "file-max",
1486 .data = &files_stat.max_files,
1487 .maxlen = sizeof(files_stat.max_files),
1488 .mode = 0644,
1489 .proc_handler = proc_doulongvec_minmax,
1490 },
1491 {
1492 .procname = "nr_open",
1493 .data = &sysctl_nr_open,
1494 .maxlen = sizeof(int),
1495 .mode = 0644,
1496 .proc_handler = proc_dointvec_minmax,
1497 .extra1 = &sysctl_nr_open_min,
1498 .extra2 = &sysctl_nr_open_max,
1499 },
1500 {
1501 .procname = "dentry-state",
1502 .data = &dentry_stat,
1503 .maxlen = 6*sizeof(int),
1504 .mode = 0444,
1505 .proc_handler = proc_nr_dentry,
1506 },
1507 {
1508 .procname = "overflowuid",
1509 .data = &fs_overflowuid,
1510 .maxlen = sizeof(int),
1511 .mode = 0644,
1512 .proc_handler = proc_dointvec_minmax,
1513 .extra1 = &minolduid,
1514 .extra2 = &maxolduid,
1515 },
1516 {
1517 .procname = "overflowgid",
1518 .data = &fs_overflowgid,
1519 .maxlen = sizeof(int),
1520 .mode = 0644,
1521 .proc_handler = proc_dointvec_minmax,
1522 .extra1 = &minolduid,
1523 .extra2 = &maxolduid,
1524 },
1525 #ifdef CONFIG_FILE_LOCKING
1526 {
1527 .procname = "leases-enable",
1528 .data = &leases_enable,
1529 .maxlen = sizeof(int),
1530 .mode = 0644,
1531 .proc_handler = proc_dointvec,
1532 },
1533 #endif
1534 #ifdef CONFIG_DNOTIFY
1535 {
1536 .procname = "dir-notify-enable",
1537 .data = &dir_notify_enable,
1538 .maxlen = sizeof(int),
1539 .mode = 0644,
1540 .proc_handler = proc_dointvec,
1541 },
1542 #endif
1543 #ifdef CONFIG_MMU
1544 #ifdef CONFIG_FILE_LOCKING
1545 {
1546 .procname = "lease-break-time",
1547 .data = &lease_break_time,
1548 .maxlen = sizeof(int),
1549 .mode = 0644,
1550 .proc_handler = proc_dointvec,
1551 },
1552 #endif
1553 #ifdef CONFIG_AIO
1554 {
1555 .procname = "aio-nr",
1556 .data = &aio_nr,
1557 .maxlen = sizeof(aio_nr),
1558 .mode = 0444,
1559 .proc_handler = proc_doulongvec_minmax,
1560 },
1561 {
1562 .procname = "aio-max-nr",
1563 .data = &aio_max_nr,
1564 .maxlen = sizeof(aio_max_nr),
1565 .mode = 0644,
1566 .proc_handler = proc_doulongvec_minmax,
1567 },
1568 #endif /* CONFIG_AIO */
1569 #ifdef CONFIG_INOTIFY_USER
1570 {
1571 .procname = "inotify",
1572 .mode = 0555,
1573 .child = inotify_table,
1574 },
1575 #endif
1576 #ifdef CONFIG_EPOLL
1577 {
1578 .procname = "epoll",
1579 .mode = 0555,
1580 .child = epoll_table,
1581 },
1582 #endif
1583 #endif
1584 {
1585 .procname = "protected_symlinks",
1586 .data = &sysctl_protected_symlinks,
1587 .maxlen = sizeof(int),
1588 .mode = 0600,
1589 .proc_handler = proc_dointvec_minmax,
1590 .extra1 = &zero,
1591 .extra2 = &one,
1592 },
1593 {
1594 .procname = "protected_hardlinks",
1595 .data = &sysctl_protected_hardlinks,
1596 .maxlen = sizeof(int),
1597 .mode = 0600,
1598 .proc_handler = proc_dointvec_minmax,
1599 .extra1 = &zero,
1600 .extra2 = &one,
1601 },
1602 {
1603 .procname = "suid_dumpable",
1604 .data = &suid_dumpable,
1605 .maxlen = sizeof(int),
1606 .mode = 0644,
1607 .proc_handler = proc_dointvec_minmax_coredump,
1608 .extra1 = &zero,
1609 .extra2 = &two,
1610 },
1611 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1612 {
1613 .procname = "binfmt_misc",
1614 .mode = 0555,
1615 .child = binfmt_misc_table,
1616 },
1617 #endif
1618 {
1619 .procname = "pipe-max-size",
1620 .data = &pipe_max_size,
1621 .maxlen = sizeof(int),
1622 .mode = 0644,
1623 .proc_handler = &pipe_proc_fn,
1624 .extra1 = &pipe_min_size,
1625 },
1626 { }
1627 };
1628
1629 static struct ctl_table debug_table[] = {
1630 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1631 {
1632 .procname = "exception-trace",
1633 .data = &show_unhandled_signals,
1634 .maxlen = sizeof(int),
1635 .mode = 0644,
1636 .proc_handler = proc_dointvec
1637 },
1638 #endif
1639 #if defined(CONFIG_OPTPROBES)
1640 {
1641 .procname = "kprobes-optimization",
1642 .data = &sysctl_kprobes_optimization,
1643 .maxlen = sizeof(int),
1644 .mode = 0644,
1645 .proc_handler = proc_kprobes_optimization_handler,
1646 .extra1 = &zero,
1647 .extra2 = &one,
1648 },
1649 #endif
1650 { }
1651 };
1652
1653 static struct ctl_table dev_table[] = {
1654 { }
1655 };
1656
1657 int __init sysctl_init(void)
1658 {
1659 struct ctl_table_header *hdr;
1660
1661 hdr = register_sysctl_table(sysctl_base_table);
1662 kmemleak_not_leak(hdr);
1663 return 0;
1664 }
1665
1666 #endif /* CONFIG_SYSCTL */
1667
1668 /*
1669 * /proc/sys support
1670 */
1671
1672 #ifdef CONFIG_PROC_SYSCTL
1673
1674 static int _proc_do_string(void* data, int maxlen, int write,
1675 void __user *buffer,
1676 size_t *lenp, loff_t *ppos)
1677 {
1678 size_t len;
1679 char __user *p;
1680 char c;
1681
1682 if (!data || !maxlen || !*lenp) {
1683 *lenp = 0;
1684 return 0;
1685 }
1686
1687 if (write) {
1688 len = 0;
1689 p = buffer;
1690 while (len < *lenp) {
1691 if (get_user(c, p++))
1692 return -EFAULT;
1693 if (c == 0 || c == '\n')
1694 break;
1695 len++;
1696 }
1697 if (len >= maxlen)
1698 len = maxlen-1;
1699 if(copy_from_user(data, buffer, len))
1700 return -EFAULT;
1701 ((char *) data)[len] = 0;
1702 *ppos += *lenp;
1703 } else {
1704 len = strlen(data);
1705 if (len > maxlen)
1706 len = maxlen;
1707
1708 if (*ppos > len) {
1709 *lenp = 0;
1710 return 0;
1711 }
1712
1713 data += *ppos;
1714 len -= *ppos;
1715
1716 if (len > *lenp)
1717 len = *lenp;
1718 if (len)
1719 if(copy_to_user(buffer, data, len))
1720 return -EFAULT;
1721 if (len < *lenp) {
1722 if(put_user('\n', ((char __user *) buffer) + len))
1723 return -EFAULT;
1724 len++;
1725 }
1726 *lenp = len;
1727 *ppos += len;
1728 }
1729 return 0;
1730 }
1731
1732 /**
1733 * proc_dostring - read a string sysctl
1734 * @table: the sysctl table
1735 * @write: %TRUE if this is a write to the sysctl file
1736 * @buffer: the user buffer
1737 * @lenp: the size of the user buffer
1738 * @ppos: file position
1739 *
1740 * Reads/writes a string from/to the user buffer. If the kernel
1741 * buffer provided is not large enough to hold the string, the
1742 * string is truncated. The copied string is %NULL-terminated.
1743 * If the string is being read by the user process, it is copied
1744 * and a newline '\n' is added. It is truncated if the buffer is
1745 * not large enough.
1746 *
1747 * Returns 0 on success.
1748 */
1749 int proc_dostring(struct ctl_table *table, int write,
1750 void __user *buffer, size_t *lenp, loff_t *ppos)
1751 {
1752 return _proc_do_string(table->data, table->maxlen, write,
1753 buffer, lenp, ppos);
1754 }
1755
1756 static size_t proc_skip_spaces(char **buf)
1757 {
1758 size_t ret;
1759 char *tmp = skip_spaces(*buf);
1760 ret = tmp - *buf;
1761 *buf = tmp;
1762 return ret;
1763 }
1764
1765 static void proc_skip_char(char **buf, size_t *size, const char v)
1766 {
1767 while (*size) {
1768 if (**buf != v)
1769 break;
1770 (*size)--;
1771 (*buf)++;
1772 }
1773 }
1774
1775 #define TMPBUFLEN 22
1776 /**
1777 * proc_get_long - reads an ASCII formatted integer from a user buffer
1778 *
1779 * @buf: a kernel buffer
1780 * @size: size of the kernel buffer
1781 * @val: this is where the number will be stored
1782 * @neg: set to %TRUE if number is negative
1783 * @perm_tr: a vector which contains the allowed trailers
1784 * @perm_tr_len: size of the perm_tr vector
1785 * @tr: pointer to store the trailer character
1786 *
1787 * In case of success %0 is returned and @buf and @size are updated with
1788 * the amount of bytes read. If @tr is non-NULL and a trailing
1789 * character exists (size is non-zero after returning from this
1790 * function), @tr is updated with the trailing character.
1791 */
1792 static int proc_get_long(char **buf, size_t *size,
1793 unsigned long *val, bool *neg,
1794 const char *perm_tr, unsigned perm_tr_len, char *tr)
1795 {
1796 int len;
1797 char *p, tmp[TMPBUFLEN];
1798
1799 if (!*size)
1800 return -EINVAL;
1801
1802 len = *size;
1803 if (len > TMPBUFLEN - 1)
1804 len = TMPBUFLEN - 1;
1805
1806 memcpy(tmp, *buf, len);
1807
1808 tmp[len] = 0;
1809 p = tmp;
1810 if (*p == '-' && *size > 1) {
1811 *neg = true;
1812 p++;
1813 } else
1814 *neg = false;
1815 if (!isdigit(*p))
1816 return -EINVAL;
1817
1818 *val = simple_strtoul(p, &p, 0);
1819
1820 len = p - tmp;
1821
1822 /* We don't know if the next char is whitespace thus we may accept
1823 * invalid integers (e.g. 1234...a) or two integers instead of one
1824 * (e.g. 123...1). So lets not allow such large numbers. */
1825 if (len == TMPBUFLEN - 1)
1826 return -EINVAL;
1827
1828 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1829 return -EINVAL;
1830
1831 if (tr && (len < *size))
1832 *tr = *p;
1833
1834 *buf += len;
1835 *size -= len;
1836
1837 return 0;
1838 }
1839
1840 /**
1841 * proc_put_long - converts an integer to a decimal ASCII formatted string
1842 *
1843 * @buf: the user buffer
1844 * @size: the size of the user buffer
1845 * @val: the integer to be converted
1846 * @neg: sign of the number, %TRUE for negative
1847 *
1848 * In case of success %0 is returned and @buf and @size are updated with
1849 * the amount of bytes written.
1850 */
1851 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1852 bool neg)
1853 {
1854 int len;
1855 char tmp[TMPBUFLEN], *p = tmp;
1856
1857 sprintf(p, "%s%lu", neg ? "-" : "", val);
1858 len = strlen(tmp);
1859 if (len > *size)
1860 len = *size;
1861 if (copy_to_user(*buf, tmp, len))
1862 return -EFAULT;
1863 *size -= len;
1864 *buf += len;
1865 return 0;
1866 }
1867 #undef TMPBUFLEN
1868
1869 static int proc_put_char(void __user **buf, size_t *size, char c)
1870 {
1871 if (*size) {
1872 char __user **buffer = (char __user **)buf;
1873 if (put_user(c, *buffer))
1874 return -EFAULT;
1875 (*size)--, (*buffer)++;
1876 *buf = *buffer;
1877 }
1878 return 0;
1879 }
1880
1881 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1882 int *valp,
1883 int write, void *data)
1884 {
1885 if (write) {
1886 *valp = *negp ? -*lvalp : *lvalp;
1887 } else {
1888 int val = *valp;
1889 if (val < 0) {
1890 *negp = true;
1891 *lvalp = (unsigned long)-val;
1892 } else {
1893 *negp = false;
1894 *lvalp = (unsigned long)val;
1895 }
1896 }
1897 return 0;
1898 }
1899
1900 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1901
1902 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1903 int write, void __user *buffer,
1904 size_t *lenp, loff_t *ppos,
1905 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1906 int write, void *data),
1907 void *data)
1908 {
1909 int *i, vleft, first = 1, err = 0;
1910 unsigned long page = 0;
1911 size_t left;
1912 char *kbuf;
1913
1914 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1915 *lenp = 0;
1916 return 0;
1917 }
1918
1919 i = (int *) tbl_data;
1920 vleft = table->maxlen / sizeof(*i);
1921 left = *lenp;
1922
1923 if (!conv)
1924 conv = do_proc_dointvec_conv;
1925
1926 if (write) {
1927 if (left > PAGE_SIZE - 1)
1928 left = PAGE_SIZE - 1;
1929 page = __get_free_page(GFP_TEMPORARY);
1930 kbuf = (char *) page;
1931 if (!kbuf)
1932 return -ENOMEM;
1933 if (copy_from_user(kbuf, buffer, left)) {
1934 err = -EFAULT;
1935 goto free;
1936 }
1937 kbuf[left] = 0;
1938 }
1939
1940 for (; left && vleft--; i++, first=0) {
1941 unsigned long lval;
1942 bool neg;
1943
1944 if (write) {
1945 left -= proc_skip_spaces(&kbuf);
1946
1947 if (!left)
1948 break;
1949 err = proc_get_long(&kbuf, &left, &lval, &neg,
1950 proc_wspace_sep,
1951 sizeof(proc_wspace_sep), NULL);
1952 if (err)
1953 break;
1954 if (conv(&neg, &lval, i, 1, data)) {
1955 err = -EINVAL;
1956 break;
1957 }
1958 } else {
1959 if (conv(&neg, &lval, i, 0, data)) {
1960 err = -EINVAL;
1961 break;
1962 }
1963 if (!first)
1964 err = proc_put_char(&buffer, &left, '\t');
1965 if (err)
1966 break;
1967 err = proc_put_long(&buffer, &left, lval, neg);
1968 if (err)
1969 break;
1970 }
1971 }
1972
1973 if (!write && !first && left && !err)
1974 err = proc_put_char(&buffer, &left, '\n');
1975 if (write && !err && left)
1976 left -= proc_skip_spaces(&kbuf);
1977 free:
1978 if (write) {
1979 free_page(page);
1980 if (first)
1981 return err ? : -EINVAL;
1982 }
1983 *lenp -= left;
1984 *ppos += *lenp;
1985 return err;
1986 }
1987
1988 static int do_proc_dointvec(struct ctl_table *table, int write,
1989 void __user *buffer, size_t *lenp, loff_t *ppos,
1990 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1991 int write, void *data),
1992 void *data)
1993 {
1994 return __do_proc_dointvec(table->data, table, write,
1995 buffer, lenp, ppos, conv, data);
1996 }
1997
1998 /**
1999 * proc_dointvec - read a vector of integers
2000 * @table: the sysctl table
2001 * @write: %TRUE if this is a write to the sysctl file
2002 * @buffer: the user buffer
2003 * @lenp: the size of the user buffer
2004 * @ppos: file position
2005 *
2006 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2007 * values from/to the user buffer, treated as an ASCII string.
2008 *
2009 * Returns 0 on success.
2010 */
2011 int proc_dointvec(struct ctl_table *table, int write,
2012 void __user *buffer, size_t *lenp, loff_t *ppos)
2013 {
2014 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2015 NULL,NULL);
2016 }
2017
2018 /*
2019 * Taint values can only be increased
2020 * This means we can safely use a temporary.
2021 */
2022 static int proc_taint(struct ctl_table *table, int write,
2023 void __user *buffer, size_t *lenp, loff_t *ppos)
2024 {
2025 struct ctl_table t;
2026 unsigned long tmptaint = get_taint();
2027 int err;
2028
2029 if (write && !capable(CAP_SYS_ADMIN))
2030 return -EPERM;
2031
2032 t = *table;
2033 t.data = &tmptaint;
2034 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2035 if (err < 0)
2036 return err;
2037
2038 if (write) {
2039 /*
2040 * Poor man's atomic or. Not worth adding a primitive
2041 * to everyone's atomic.h for this
2042 */
2043 int i;
2044 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2045 if ((tmptaint >> i) & 1)
2046 add_taint(i, LOCKDEP_STILL_OK);
2047 }
2048 }
2049
2050 return err;
2051 }
2052
2053 #ifdef CONFIG_PRINTK
2054 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2055 void __user *buffer, size_t *lenp, loff_t *ppos)
2056 {
2057 if (write && !capable(CAP_SYS_ADMIN))
2058 return -EPERM;
2059
2060 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2061 }
2062 #endif
2063
2064 struct do_proc_dointvec_minmax_conv_param {
2065 int *min;
2066 int *max;
2067 };
2068
2069 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2070 int *valp,
2071 int write, void *data)
2072 {
2073 struct do_proc_dointvec_minmax_conv_param *param = data;
2074 if (write) {
2075 int val = *negp ? -*lvalp : *lvalp;
2076 if ((param->min && *param->min > val) ||
2077 (param->max && *param->max < val))
2078 return -EINVAL;
2079 *valp = val;
2080 } else {
2081 int val = *valp;
2082 if (val < 0) {
2083 *negp = true;
2084 *lvalp = (unsigned long)-val;
2085 } else {
2086 *negp = false;
2087 *lvalp = (unsigned long)val;
2088 }
2089 }
2090 return 0;
2091 }
2092
2093 /**
2094 * proc_dointvec_minmax - read a vector of integers with min/max values
2095 * @table: the sysctl table
2096 * @write: %TRUE if this is a write to the sysctl file
2097 * @buffer: the user buffer
2098 * @lenp: the size of the user buffer
2099 * @ppos: file position
2100 *
2101 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2102 * values from/to the user buffer, treated as an ASCII string.
2103 *
2104 * This routine will ensure the values are within the range specified by
2105 * table->extra1 (min) and table->extra2 (max).
2106 *
2107 * Returns 0 on success.
2108 */
2109 int proc_dointvec_minmax(struct ctl_table *table, int write,
2110 void __user *buffer, size_t *lenp, loff_t *ppos)
2111 {
2112 struct do_proc_dointvec_minmax_conv_param param = {
2113 .min = (int *) table->extra1,
2114 .max = (int *) table->extra2,
2115 };
2116 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2117 do_proc_dointvec_minmax_conv, &param);
2118 }
2119
2120 static void validate_coredump_safety(void)
2121 {
2122 #ifdef CONFIG_COREDUMP
2123 if (suid_dumpable == SUID_DUMP_ROOT &&
2124 core_pattern[0] != '/' && core_pattern[0] != '|') {
2125 printk(KERN_WARNING "Unsafe core_pattern used with "\
2126 "suid_dumpable=2. Pipe handler or fully qualified "\
2127 "core dump path required.\n");
2128 }
2129 #endif
2130 }
2131
2132 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2133 void __user *buffer, size_t *lenp, loff_t *ppos)
2134 {
2135 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2136 if (!error)
2137 validate_coredump_safety();
2138 return error;
2139 }
2140
2141 #ifdef CONFIG_COREDUMP
2142 static int proc_dostring_coredump(struct ctl_table *table, int write,
2143 void __user *buffer, size_t *lenp, loff_t *ppos)
2144 {
2145 int error = proc_dostring(table, write, buffer, lenp, ppos);
2146 if (!error)
2147 validate_coredump_safety();
2148 return error;
2149 }
2150 #endif
2151
2152 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2153 void __user *buffer,
2154 size_t *lenp, loff_t *ppos,
2155 unsigned long convmul,
2156 unsigned long convdiv)
2157 {
2158 unsigned long *i, *min, *max;
2159 int vleft, first = 1, err = 0;
2160 unsigned long page = 0;
2161 size_t left;
2162 char *kbuf;
2163
2164 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2165 *lenp = 0;
2166 return 0;
2167 }
2168
2169 i = (unsigned long *) data;
2170 min = (unsigned long *) table->extra1;
2171 max = (unsigned long *) table->extra2;
2172 vleft = table->maxlen / sizeof(unsigned long);
2173 left = *lenp;
2174
2175 if (write) {
2176 if (left > PAGE_SIZE - 1)
2177 left = PAGE_SIZE - 1;
2178 page = __get_free_page(GFP_TEMPORARY);
2179 kbuf = (char *) page;
2180 if (!kbuf)
2181 return -ENOMEM;
2182 if (copy_from_user(kbuf, buffer, left)) {
2183 err = -EFAULT;
2184 goto free;
2185 }
2186 kbuf[left] = 0;
2187 }
2188
2189 for (; left && vleft--; i++, first = 0) {
2190 unsigned long val;
2191
2192 if (write) {
2193 bool neg;
2194
2195 left -= proc_skip_spaces(&kbuf);
2196
2197 err = proc_get_long(&kbuf, &left, &val, &neg,
2198 proc_wspace_sep,
2199 sizeof(proc_wspace_sep), NULL);
2200 if (err)
2201 break;
2202 if (neg)
2203 continue;
2204 if ((min && val < *min) || (max && val > *max))
2205 continue;
2206 *i = val;
2207 } else {
2208 val = convdiv * (*i) / convmul;
2209 if (!first)
2210 err = proc_put_char(&buffer, &left, '\t');
2211 err = proc_put_long(&buffer, &left, val, false);
2212 if (err)
2213 break;
2214 }
2215 }
2216
2217 if (!write && !first && left && !err)
2218 err = proc_put_char(&buffer, &left, '\n');
2219 if (write && !err)
2220 left -= proc_skip_spaces(&kbuf);
2221 free:
2222 if (write) {
2223 free_page(page);
2224 if (first)
2225 return err ? : -EINVAL;
2226 }
2227 *lenp -= left;
2228 *ppos += *lenp;
2229 return err;
2230 }
2231
2232 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2233 void __user *buffer,
2234 size_t *lenp, loff_t *ppos,
2235 unsigned long convmul,
2236 unsigned long convdiv)
2237 {
2238 return __do_proc_doulongvec_minmax(table->data, table, write,
2239 buffer, lenp, ppos, convmul, convdiv);
2240 }
2241
2242 /**
2243 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2244 * @table: the sysctl table
2245 * @write: %TRUE if this is a write to the sysctl file
2246 * @buffer: the user buffer
2247 * @lenp: the size of the user buffer
2248 * @ppos: file position
2249 *
2250 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2251 * values from/to the user buffer, treated as an ASCII string.
2252 *
2253 * This routine will ensure the values are within the range specified by
2254 * table->extra1 (min) and table->extra2 (max).
2255 *
2256 * Returns 0 on success.
2257 */
2258 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2259 void __user *buffer, size_t *lenp, loff_t *ppos)
2260 {
2261 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2262 }
2263
2264 /**
2265 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2266 * @table: the sysctl table
2267 * @write: %TRUE if this is a write to the sysctl file
2268 * @buffer: the user buffer
2269 * @lenp: the size of the user buffer
2270 * @ppos: file position
2271 *
2272 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2273 * values from/to the user buffer, treated as an ASCII string. The values
2274 * are treated as milliseconds, and converted to jiffies when they are stored.
2275 *
2276 * This routine will ensure the values are within the range specified by
2277 * table->extra1 (min) and table->extra2 (max).
2278 *
2279 * Returns 0 on success.
2280 */
2281 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2282 void __user *buffer,
2283 size_t *lenp, loff_t *ppos)
2284 {
2285 return do_proc_doulongvec_minmax(table, write, buffer,
2286 lenp, ppos, HZ, 1000l);
2287 }
2288
2289
2290 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2291 int *valp,
2292 int write, void *data)
2293 {
2294 if (write) {
2295 if (*lvalp > LONG_MAX / HZ)
2296 return 1;
2297 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2298 } else {
2299 int val = *valp;
2300 unsigned long lval;
2301 if (val < 0) {
2302 *negp = true;
2303 lval = (unsigned long)-val;
2304 } else {
2305 *negp = false;
2306 lval = (unsigned long)val;
2307 }
2308 *lvalp = lval / HZ;
2309 }
2310 return 0;
2311 }
2312
2313 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2314 int *valp,
2315 int write, void *data)
2316 {
2317 if (write) {
2318 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2319 return 1;
2320 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2321 } else {
2322 int val = *valp;
2323 unsigned long lval;
2324 if (val < 0) {
2325 *negp = true;
2326 lval = (unsigned long)-val;
2327 } else {
2328 *negp = false;
2329 lval = (unsigned long)val;
2330 }
2331 *lvalp = jiffies_to_clock_t(lval);
2332 }
2333 return 0;
2334 }
2335
2336 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2337 int *valp,
2338 int write, void *data)
2339 {
2340 if (write) {
2341 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2342 } else {
2343 int val = *valp;
2344 unsigned long lval;
2345 if (val < 0) {
2346 *negp = true;
2347 lval = (unsigned long)-val;
2348 } else {
2349 *negp = false;
2350 lval = (unsigned long)val;
2351 }
2352 *lvalp = jiffies_to_msecs(lval);
2353 }
2354 return 0;
2355 }
2356
2357 /**
2358 * proc_dointvec_jiffies - read a vector of integers as seconds
2359 * @table: the sysctl table
2360 * @write: %TRUE if this is a write to the sysctl file
2361 * @buffer: the user buffer
2362 * @lenp: the size of the user buffer
2363 * @ppos: file position
2364 *
2365 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2366 * values from/to the user buffer, treated as an ASCII string.
2367 * The values read are assumed to be in seconds, and are converted into
2368 * jiffies.
2369 *
2370 * Returns 0 on success.
2371 */
2372 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2373 void __user *buffer, size_t *lenp, loff_t *ppos)
2374 {
2375 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2376 do_proc_dointvec_jiffies_conv,NULL);
2377 }
2378
2379 /**
2380 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2381 * @table: the sysctl table
2382 * @write: %TRUE if this is a write to the sysctl file
2383 * @buffer: the user buffer
2384 * @lenp: the size of the user buffer
2385 * @ppos: pointer to the file position
2386 *
2387 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2388 * values from/to the user buffer, treated as an ASCII string.
2389 * The values read are assumed to be in 1/USER_HZ seconds, and
2390 * are converted into jiffies.
2391 *
2392 * Returns 0 on success.
2393 */
2394 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2395 void __user *buffer, size_t *lenp, loff_t *ppos)
2396 {
2397 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2398 do_proc_dointvec_userhz_jiffies_conv,NULL);
2399 }
2400
2401 /**
2402 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2403 * @table: the sysctl table
2404 * @write: %TRUE if this is a write to the sysctl file
2405 * @buffer: the user buffer
2406 * @lenp: the size of the user buffer
2407 * @ppos: file position
2408 * @ppos: the current position in the file
2409 *
2410 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2411 * values from/to the user buffer, treated as an ASCII string.
2412 * The values read are assumed to be in 1/1000 seconds, and
2413 * are converted into jiffies.
2414 *
2415 * Returns 0 on success.
2416 */
2417 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2418 void __user *buffer, size_t *lenp, loff_t *ppos)
2419 {
2420 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2421 do_proc_dointvec_ms_jiffies_conv, NULL);
2422 }
2423
2424 static int proc_do_cad_pid(struct ctl_table *table, int write,
2425 void __user *buffer, size_t *lenp, loff_t *ppos)
2426 {
2427 struct pid *new_pid;
2428 pid_t tmp;
2429 int r;
2430
2431 tmp = pid_vnr(cad_pid);
2432
2433 r = __do_proc_dointvec(&tmp, table, write, buffer,
2434 lenp, ppos, NULL, NULL);
2435 if (r || !write)
2436 return r;
2437
2438 new_pid = find_get_pid(tmp);
2439 if (!new_pid)
2440 return -ESRCH;
2441
2442 put_pid(xchg(&cad_pid, new_pid));
2443 return 0;
2444 }
2445
2446 /**
2447 * proc_do_large_bitmap - read/write from/to a large bitmap
2448 * @table: the sysctl table
2449 * @write: %TRUE if this is a write to the sysctl file
2450 * @buffer: the user buffer
2451 * @lenp: the size of the user buffer
2452 * @ppos: file position
2453 *
2454 * The bitmap is stored at table->data and the bitmap length (in bits)
2455 * in table->maxlen.
2456 *
2457 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2458 * large bitmaps may be represented in a compact manner. Writing into
2459 * the file will clear the bitmap then update it with the given input.
2460 *
2461 * Returns 0 on success.
2462 */
2463 int proc_do_large_bitmap(struct ctl_table *table, int write,
2464 void __user *buffer, size_t *lenp, loff_t *ppos)
2465 {
2466 int err = 0;
2467 bool first = 1;
2468 size_t left = *lenp;
2469 unsigned long bitmap_len = table->maxlen;
2470 unsigned long *bitmap = (unsigned long *) table->data;
2471 unsigned long *tmp_bitmap = NULL;
2472 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2473
2474 if (!bitmap_len || !left || (*ppos && !write)) {
2475 *lenp = 0;
2476 return 0;
2477 }
2478
2479 if (write) {
2480 unsigned long page = 0;
2481 char *kbuf;
2482
2483 if (left > PAGE_SIZE - 1)
2484 left = PAGE_SIZE - 1;
2485
2486 page = __get_free_page(GFP_TEMPORARY);
2487 kbuf = (char *) page;
2488 if (!kbuf)
2489 return -ENOMEM;
2490 if (copy_from_user(kbuf, buffer, left)) {
2491 free_page(page);
2492 return -EFAULT;
2493 }
2494 kbuf[left] = 0;
2495
2496 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2497 GFP_KERNEL);
2498 if (!tmp_bitmap) {
2499 free_page(page);
2500 return -ENOMEM;
2501 }
2502 proc_skip_char(&kbuf, &left, '\n');
2503 while (!err && left) {
2504 unsigned long val_a, val_b;
2505 bool neg;
2506
2507 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2508 sizeof(tr_a), &c);
2509 if (err)
2510 break;
2511 if (val_a >= bitmap_len || neg) {
2512 err = -EINVAL;
2513 break;
2514 }
2515
2516 val_b = val_a;
2517 if (left) {
2518 kbuf++;
2519 left--;
2520 }
2521
2522 if (c == '-') {
2523 err = proc_get_long(&kbuf, &left, &val_b,
2524 &neg, tr_b, sizeof(tr_b),
2525 &c);
2526 if (err)
2527 break;
2528 if (val_b >= bitmap_len || neg ||
2529 val_a > val_b) {
2530 err = -EINVAL;
2531 break;
2532 }
2533 if (left) {
2534 kbuf++;
2535 left--;
2536 }
2537 }
2538
2539 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2540 first = 0;
2541 proc_skip_char(&kbuf, &left, '\n');
2542 }
2543 free_page(page);
2544 } else {
2545 unsigned long bit_a, bit_b = 0;
2546
2547 while (left) {
2548 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2549 if (bit_a >= bitmap_len)
2550 break;
2551 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2552 bit_a + 1) - 1;
2553
2554 if (!first) {
2555 err = proc_put_char(&buffer, &left, ',');
2556 if (err)
2557 break;
2558 }
2559 err = proc_put_long(&buffer, &left, bit_a, false);
2560 if (err)
2561 break;
2562 if (bit_a != bit_b) {
2563 err = proc_put_char(&buffer, &left, '-');
2564 if (err)
2565 break;
2566 err = proc_put_long(&buffer, &left, bit_b, false);
2567 if (err)
2568 break;
2569 }
2570
2571 first = 0; bit_b++;
2572 }
2573 if (!err)
2574 err = proc_put_char(&buffer, &left, '\n');
2575 }
2576
2577 if (!err) {
2578 if (write) {
2579 if (*ppos)
2580 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2581 else
2582 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2583 }
2584 kfree(tmp_bitmap);
2585 *lenp -= left;
2586 *ppos += *lenp;
2587 return 0;
2588 } else {
2589 kfree(tmp_bitmap);
2590 return err;
2591 }
2592 }
2593
2594 #else /* CONFIG_PROC_SYSCTL */
2595
2596 int proc_dostring(struct ctl_table *table, int write,
2597 void __user *buffer, size_t *lenp, loff_t *ppos)
2598 {
2599 return -ENOSYS;
2600 }
2601
2602 int proc_dointvec(struct ctl_table *table, int write,
2603 void __user *buffer, size_t *lenp, loff_t *ppos)
2604 {
2605 return -ENOSYS;
2606 }
2607
2608 int proc_dointvec_minmax(struct ctl_table *table, int write,
2609 void __user *buffer, size_t *lenp, loff_t *ppos)
2610 {
2611 return -ENOSYS;
2612 }
2613
2614 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2615 void __user *buffer, size_t *lenp, loff_t *ppos)
2616 {
2617 return -ENOSYS;
2618 }
2619
2620 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2621 void __user *buffer, size_t *lenp, loff_t *ppos)
2622 {
2623 return -ENOSYS;
2624 }
2625
2626 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2627 void __user *buffer, size_t *lenp, loff_t *ppos)
2628 {
2629 return -ENOSYS;
2630 }
2631
2632 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2633 void __user *buffer, size_t *lenp, loff_t *ppos)
2634 {
2635 return -ENOSYS;
2636 }
2637
2638 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2639 void __user *buffer,
2640 size_t *lenp, loff_t *ppos)
2641 {
2642 return -ENOSYS;
2643 }
2644
2645
2646 #endif /* CONFIG_PROC_SYSCTL */
2647
2648 /*
2649 * No sense putting this after each symbol definition, twice,
2650 * exception granted :-)
2651 */
2652 EXPORT_SYMBOL(proc_dointvec);
2653 EXPORT_SYMBOL(proc_dointvec_jiffies);
2654 EXPORT_SYMBOL(proc_dointvec_minmax);
2655 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2656 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2657 EXPORT_SYMBOL(proc_dostring);
2658 EXPORT_SYMBOL(proc_doulongvec_minmax);
2659 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
Linux kernel - Deliverables
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