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perf tools: Move libperl check config into config/Makefile
[linux-2.6/btrfs-unstable.git] / kernel / sysctl.c
blobb0a1f99907f376f9a4dcd602c9044557bc3d0ea6
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 #endif
603 #ifdef CONFIG_MODULES
604 {
605 .procname = "modprobe",
606 .data = &modprobe_path,
607 .maxlen = KMOD_PATH_LEN,
608 .mode = 0644,
609 .proc_handler = proc_dostring,
610 },
611 {
612 .procname = "modules_disabled",
613 .data = &modules_disabled,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 /* only handle a transition from default "0" to "1" */
617 .proc_handler = proc_dointvec_minmax,
618 .extra1 = &one,
619 .extra2 = &one,
620 },
621 #endif
622
623 {
624 .procname = "hotplug",
625 .data = &uevent_helper,
626 .maxlen = UEVENT_HELPER_PATH_LEN,
627 .mode = 0644,
628 .proc_handler = proc_dostring,
629 },
630
631 #ifdef CONFIG_CHR_DEV_SG
632 {
633 .procname = "sg-big-buff",
634 .data = &sg_big_buff,
635 .maxlen = sizeof (int),
636 .mode = 0444,
637 .proc_handler = proc_dointvec,
638 },
639 #endif
640 #ifdef CONFIG_BSD_PROCESS_ACCT
641 {
642 .procname = "acct",
643 .data = &acct_parm,
644 .maxlen = 3*sizeof(int),
645 .mode = 0644,
646 .proc_handler = proc_dointvec,
647 },
648 #endif
649 #ifdef CONFIG_MAGIC_SYSRQ
650 {
651 .procname = "sysrq",
652 .data = &__sysrq_enabled,
653 .maxlen = sizeof (int),
654 .mode = 0644,
655 .proc_handler = sysrq_sysctl_handler,
656 },
657 #endif
658 #ifdef CONFIG_PROC_SYSCTL
659 {
660 .procname = "cad_pid",
661 .data = NULL,
662 .maxlen = sizeof (int),
663 .mode = 0600,
664 .proc_handler = proc_do_cad_pid,
665 },
666 #endif
667 {
668 .procname = "threads-max",
669 .data = &max_threads,
670 .maxlen = sizeof(int),
671 .mode = 0644,
672 .proc_handler = proc_dointvec,
673 },
674 {
675 .procname = "random",
676 .mode = 0555,
677 .child = random_table,
678 },
679 {
680 .procname = "usermodehelper",
681 .mode = 0555,
682 .child = usermodehelper_table,
683 },
684 {
685 .procname = "overflowuid",
686 .data = &overflowuid,
687 .maxlen = sizeof(int),
688 .mode = 0644,
689 .proc_handler = proc_dointvec_minmax,
690 .extra1 = &minolduid,
691 .extra2 = &maxolduid,
692 },
693 {
694 .procname = "overflowgid",
695 .data = &overflowgid,
696 .maxlen = sizeof(int),
697 .mode = 0644,
698 .proc_handler = proc_dointvec_minmax,
699 .extra1 = &minolduid,
700 .extra2 = &maxolduid,
701 },
702 #ifdef CONFIG_S390
703 #ifdef CONFIG_MATHEMU
704 {
705 .procname = "ieee_emulation_warnings",
706 .data = &sysctl_ieee_emulation_warnings,
707 .maxlen = sizeof(int),
708 .mode = 0644,
709 .proc_handler = proc_dointvec,
710 },
711 #endif
712 {
713 .procname = "userprocess_debug",
714 .data = &show_unhandled_signals,
715 .maxlen = sizeof(int),
716 .mode = 0644,
717 .proc_handler = proc_dointvec,
718 },
719 #endif
720 {
721 .procname = "pid_max",
722 .data = &pid_max,
723 .maxlen = sizeof (int),
724 .mode = 0644,
725 .proc_handler = proc_dointvec_minmax,
726 .extra1 = &pid_max_min,
727 .extra2 = &pid_max_max,
728 },
729 {
730 .procname = "panic_on_oops",
731 .data = &panic_on_oops,
732 .maxlen = sizeof(int),
733 .mode = 0644,
734 .proc_handler = proc_dointvec,
735 },
736 #if defined CONFIG_PRINTK
737 {
738 .procname = "printk",
739 .data = &console_loglevel,
740 .maxlen = 4*sizeof(int),
741 .mode = 0644,
742 .proc_handler = proc_dointvec,
743 },
744 {
745 .procname = "printk_ratelimit",
746 .data = &printk_ratelimit_state.interval,
747 .maxlen = sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dointvec_jiffies,
750 },
751 {
752 .procname = "printk_ratelimit_burst",
753 .data = &printk_ratelimit_state.burst,
754 .maxlen = sizeof(int),
755 .mode = 0644,
756 .proc_handler = proc_dointvec,
757 },
758 {
759 .procname = "printk_delay",
760 .data = &printk_delay_msec,
761 .maxlen = sizeof(int),
762 .mode = 0644,
763 .proc_handler = proc_dointvec_minmax,
764 .extra1 = &zero,
765 .extra2 = &ten_thousand,
766 },
767 {
768 .procname = "dmesg_restrict",
769 .data = &dmesg_restrict,
770 .maxlen = sizeof(int),
771 .mode = 0644,
772 .proc_handler = proc_dointvec_minmax_sysadmin,
773 .extra1 = &zero,
774 .extra2 = &one,
775 },
776 {
777 .procname = "kptr_restrict",
778 .data = &kptr_restrict,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = proc_dointvec_minmax_sysadmin,
782 .extra1 = &zero,
783 .extra2 = &two,
784 },
785 #endif
786 {
787 .procname = "ngroups_max",
788 .data = &ngroups_max,
789 .maxlen = sizeof (int),
790 .mode = 0444,
791 .proc_handler = proc_dointvec,
792 },
793 {
794 .procname = "cap_last_cap",
795 .data = (void *)&cap_last_cap,
796 .maxlen = sizeof(int),
797 .mode = 0444,
798 .proc_handler = proc_dointvec,
799 },
800 #if defined(CONFIG_LOCKUP_DETECTOR)
801 {
802 .procname = "watchdog",
803 .data = &watchdog_enabled,
804 .maxlen = sizeof (int),
805 .mode = 0644,
806 .proc_handler = proc_dowatchdog,
807 .extra1 = &zero,
808 .extra2 = &one,
809 },
810 {
811 .procname = "watchdog_thresh",
812 .data = &watchdog_thresh,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dowatchdog,
816 .extra1 = &zero,
817 .extra2 = &sixty,
818 },
819 {
820 .procname = "softlockup_panic",
821 .data = &softlockup_panic,
822 .maxlen = sizeof(int),
823 .mode = 0644,
824 .proc_handler = proc_dointvec_minmax,
825 .extra1 = &zero,
826 .extra2 = &one,
827 },
828 {
829 .procname = "nmi_watchdog",
830 .data = &watchdog_enabled,
831 .maxlen = sizeof (int),
832 .mode = 0644,
833 .proc_handler = proc_dowatchdog,
834 .extra1 = &zero,
835 .extra2 = &one,
836 },
837 #endif
838 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
839 {
840 .procname = "unknown_nmi_panic",
841 .data = &unknown_nmi_panic,
842 .maxlen = sizeof (int),
843 .mode = 0644,
844 .proc_handler = proc_dointvec,
845 },
846 #endif
847 #if defined(CONFIG_X86)
848 {
849 .procname = "panic_on_unrecovered_nmi",
850 .data = &panic_on_unrecovered_nmi,
851 .maxlen = sizeof(int),
852 .mode = 0644,
853 .proc_handler = proc_dointvec,
854 },
855 {
856 .procname = "panic_on_io_nmi",
857 .data = &panic_on_io_nmi,
858 .maxlen = sizeof(int),
859 .mode = 0644,
860 .proc_handler = proc_dointvec,
861 },
862 #ifdef CONFIG_DEBUG_STACKOVERFLOW
863 {
864 .procname = "panic_on_stackoverflow",
865 .data = &sysctl_panic_on_stackoverflow,
866 .maxlen = sizeof(int),
867 .mode = 0644,
868 .proc_handler = proc_dointvec,
869 },
870 #endif
871 {
872 .procname = "bootloader_type",
873 .data = &bootloader_type,
874 .maxlen = sizeof (int),
875 .mode = 0444,
876 .proc_handler = proc_dointvec,
877 },
878 {
879 .procname = "bootloader_version",
880 .data = &bootloader_version,
881 .maxlen = sizeof (int),
882 .mode = 0444,
883 .proc_handler = proc_dointvec,
884 },
885 {
886 .procname = "kstack_depth_to_print",
887 .data = &kstack_depth_to_print,
888 .maxlen = sizeof(int),
889 .mode = 0644,
890 .proc_handler = proc_dointvec,
891 },
892 {
893 .procname = "io_delay_type",
894 .data = &io_delay_type,
895 .maxlen = sizeof(int),
896 .mode = 0644,
897 .proc_handler = proc_dointvec,
898 },
899 #endif
900 #if defined(CONFIG_MMU)
901 {
902 .procname = "randomize_va_space",
903 .data = &randomize_va_space,
904 .maxlen = sizeof(int),
905 .mode = 0644,
906 .proc_handler = proc_dointvec,
907 },
908 #endif
909 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
910 {
911 .procname = "spin_retry",
912 .data = &spin_retry,
913 .maxlen = sizeof (int),
914 .mode = 0644,
915 .proc_handler = proc_dointvec,
916 },
917 #endif
918 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
919 {
920 .procname = "acpi_video_flags",
921 .data = &acpi_realmode_flags,
922 .maxlen = sizeof (unsigned long),
923 .mode = 0644,
924 .proc_handler = proc_doulongvec_minmax,
925 },
926 #endif
927 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
928 {
929 .procname = "ignore-unaligned-usertrap",
930 .data = &no_unaligned_warning,
931 .maxlen = sizeof (int),
932 .mode = 0644,
933 .proc_handler = proc_dointvec,
934 },
935 #endif
936 #ifdef CONFIG_IA64
937 {
938 .procname = "unaligned-dump-stack",
939 .data = &unaligned_dump_stack,
940 .maxlen = sizeof (int),
941 .mode = 0644,
942 .proc_handler = proc_dointvec,
943 },
944 #endif
945 #ifdef CONFIG_DETECT_HUNG_TASK
946 {
947 .procname = "hung_task_panic",
948 .data = &sysctl_hung_task_panic,
949 .maxlen = sizeof(int),
950 .mode = 0644,
951 .proc_handler = proc_dointvec_minmax,
952 .extra1 = &zero,
953 .extra2 = &one,
954 },
955 {
956 .procname = "hung_task_check_count",
957 .data = &sysctl_hung_task_check_count,
958 .maxlen = sizeof(unsigned long),
959 .mode = 0644,
960 .proc_handler = proc_doulongvec_minmax,
961 },
962 {
963 .procname = "hung_task_timeout_secs",
964 .data = &sysctl_hung_task_timeout_secs,
965 .maxlen = sizeof(unsigned long),
966 .mode = 0644,
967 .proc_handler = proc_dohung_task_timeout_secs,
968 },
969 {
970 .procname = "hung_task_warnings",
971 .data = &sysctl_hung_task_warnings,
972 .maxlen = sizeof(unsigned long),
973 .mode = 0644,
974 .proc_handler = proc_doulongvec_minmax,
975 },
976 #endif
977 #ifdef CONFIG_COMPAT
978 {
979 .procname = "compat-log",
980 .data = &compat_log,
981 .maxlen = sizeof (int),
982 .mode = 0644,
983 .proc_handler = proc_dointvec,
984 },
985 #endif
986 #ifdef CONFIG_RT_MUTEXES
987 {
988 .procname = "max_lock_depth",
989 .data = &max_lock_depth,
990 .maxlen = sizeof(int),
991 .mode = 0644,
992 .proc_handler = proc_dointvec,
993 },
994 #endif
995 {
996 .procname = "poweroff_cmd",
997 .data = &poweroff_cmd,
998 .maxlen = POWEROFF_CMD_PATH_LEN,
999 .mode = 0644,
1000 .proc_handler = proc_dostring,
1001 },
1002 #ifdef CONFIG_KEYS
1003 {
1004 .procname = "keys",
1005 .mode = 0555,
1006 .child = key_sysctls,
1007 },
1008 #endif
1009 #ifdef CONFIG_RCU_TORTURE_TEST
1010 {
1011 .procname = "rcutorture_runnable",
1012 .data = &rcutorture_runnable,
1013 .maxlen = sizeof(int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec,
1016 },
1017 #endif
1018 #ifdef CONFIG_PERF_EVENTS
1019 /*
1020 * User-space scripts rely on the existence of this file
1021 * as a feature check for perf_events being enabled.
1022 *
1023 * So it's an ABI, do not remove!
1024 */
1025 {
1026 .procname = "perf_event_paranoid",
1027 .data = &sysctl_perf_event_paranoid,
1028 .maxlen = sizeof(sysctl_perf_event_paranoid),
1029 .mode = 0644,
1030 .proc_handler = proc_dointvec,
1031 },
1032 {
1033 .procname = "perf_event_mlock_kb",
1034 .data = &sysctl_perf_event_mlock,
1035 .maxlen = sizeof(sysctl_perf_event_mlock),
1036 .mode = 0644,
1037 .proc_handler = proc_dointvec,
1038 },
1039 {
1040 .procname = "perf_event_max_sample_rate",
1041 .data = &sysctl_perf_event_sample_rate,
1042 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1043 .mode = 0644,
1044 .proc_handler = perf_proc_update_handler,
1045 },
1046 #endif
1047 #ifdef CONFIG_KMEMCHECK
1048 {
1049 .procname = "kmemcheck",
1050 .data = &kmemcheck_enabled,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = proc_dointvec,
1054 },
1055 #endif
1056 #ifdef CONFIG_BLOCK
1057 {
1058 .procname = "blk_iopoll",
1059 .data = &blk_iopoll_enabled,
1060 .maxlen = sizeof(int),
1061 .mode = 0644,
1062 .proc_handler = proc_dointvec,
1063 },
1064 #endif
1065 { }
1066 };
1067
1068 static struct ctl_table vm_table[] = {
1069 {
1070 .procname = "overcommit_memory",
1071 .data = &sysctl_overcommit_memory,
1072 .maxlen = sizeof(sysctl_overcommit_memory),
1073 .mode = 0644,
1074 .proc_handler = proc_dointvec_minmax,
1075 .extra1 = &zero,
1076 .extra2 = &two,
1077 },
1078 {
1079 .procname = "panic_on_oom",
1080 .data = &sysctl_panic_on_oom,
1081 .maxlen = sizeof(sysctl_panic_on_oom),
1082 .mode = 0644,
1083 .proc_handler = proc_dointvec_minmax,
1084 .extra1 = &zero,
1085 .extra2 = &two,
1086 },
1087 {
1088 .procname = "oom_kill_allocating_task",
1089 .data = &sysctl_oom_kill_allocating_task,
1090 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1091 .mode = 0644,
1092 .proc_handler = proc_dointvec,
1093 },
1094 {
1095 .procname = "oom_dump_tasks",
1096 .data = &sysctl_oom_dump_tasks,
1097 .maxlen = sizeof(sysctl_oom_dump_tasks),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec,
1100 },
1101 {
1102 .procname = "overcommit_ratio",
1103 .data = &sysctl_overcommit_ratio,
1104 .maxlen = sizeof(sysctl_overcommit_ratio),
1105 .mode = 0644,
1106 .proc_handler = proc_dointvec,
1107 },
1108 {
1109 .procname = "page-cluster",
1110 .data = &page_cluster,
1111 .maxlen = sizeof(int),
1112 .mode = 0644,
1113 .proc_handler = proc_dointvec_minmax,
1114 .extra1 = &zero,
1115 },
1116 {
1117 .procname = "dirty_background_ratio",
1118 .data = &dirty_background_ratio,
1119 .maxlen = sizeof(dirty_background_ratio),
1120 .mode = 0644,
1121 .proc_handler = dirty_background_ratio_handler,
1122 .extra1 = &zero,
1123 .extra2 = &one_hundred,
1124 },
1125 {
1126 .procname = "dirty_background_bytes",
1127 .data = &dirty_background_bytes,
1128 .maxlen = sizeof(dirty_background_bytes),
1129 .mode = 0644,
1130 .proc_handler = dirty_background_bytes_handler,
1131 .extra1 = &one_ul,
1132 },
1133 {
1134 .procname = "dirty_ratio",
1135 .data = &vm_dirty_ratio,
1136 .maxlen = sizeof(vm_dirty_ratio),
1137 .mode = 0644,
1138 .proc_handler = dirty_ratio_handler,
1139 .extra1 = &zero,
1140 .extra2 = &one_hundred,
1141 },
1142 {
1143 .procname = "dirty_bytes",
1144 .data = &vm_dirty_bytes,
1145 .maxlen = sizeof(vm_dirty_bytes),
1146 .mode = 0644,
1147 .proc_handler = dirty_bytes_handler,
1148 .extra1 = &dirty_bytes_min,
1149 },
1150 {
1151 .procname = "dirty_writeback_centisecs",
1152 .data = &dirty_writeback_interval,
1153 .maxlen = sizeof(dirty_writeback_interval),
1154 .mode = 0644,
1155 .proc_handler = dirty_writeback_centisecs_handler,
1156 },
1157 {
1158 .procname = "dirty_expire_centisecs",
1159 .data = &dirty_expire_interval,
1160 .maxlen = sizeof(dirty_expire_interval),
1161 .mode = 0644,
1162 .proc_handler = proc_dointvec_minmax,
1163 .extra1 = &zero,
1164 },
1165 {
1166 .procname = "nr_pdflush_threads",
1167 .mode = 0444 /* read-only */,
1168 .proc_handler = pdflush_proc_obsolete,
1169 },
1170 {
1171 .procname = "swappiness",
1172 .data = &vm_swappiness,
1173 .maxlen = sizeof(vm_swappiness),
1174 .mode = 0644,
1175 .proc_handler = proc_dointvec_minmax,
1176 .extra1 = &zero,
1177 .extra2 = &one_hundred,
1178 },
1179 #ifdef CONFIG_HUGETLB_PAGE
1180 {
1181 .procname = "nr_hugepages",
1182 .data = NULL,
1183 .maxlen = sizeof(unsigned long),
1184 .mode = 0644,
1185 .proc_handler = hugetlb_sysctl_handler,
1186 .extra1 = (void *)&hugetlb_zero,
1187 .extra2 = (void *)&hugetlb_infinity,
1188 },
1189 #ifdef CONFIG_NUMA
1190 {
1191 .procname = "nr_hugepages_mempolicy",
1192 .data = NULL,
1193 .maxlen = sizeof(unsigned long),
1194 .mode = 0644,
1195 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1196 .extra1 = (void *)&hugetlb_zero,
1197 .extra2 = (void *)&hugetlb_infinity,
1198 },
1199 #endif
1200 {
1201 .procname = "hugetlb_shm_group",
1202 .data = &sysctl_hugetlb_shm_group,
1203 .maxlen = sizeof(gid_t),
1204 .mode = 0644,
1205 .proc_handler = proc_dointvec,
1206 },
1207 {
1208 .procname = "hugepages_treat_as_movable",
1209 .data = &hugepages_treat_as_movable,
1210 .maxlen = sizeof(int),
1211 .mode = 0644,
1212 .proc_handler = hugetlb_treat_movable_handler,
1213 },
1214 {
1215 .procname = "nr_overcommit_hugepages",
1216 .data = NULL,
1217 .maxlen = sizeof(unsigned long),
1218 .mode = 0644,
1219 .proc_handler = hugetlb_overcommit_handler,
1220 .extra1 = (void *)&hugetlb_zero,
1221 .extra2 = (void *)&hugetlb_infinity,
1222 },
1223 #endif
1224 {
1225 .procname = "lowmem_reserve_ratio",
1226 .data = &sysctl_lowmem_reserve_ratio,
1227 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1228 .mode = 0644,
1229 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1230 },
1231 {
1232 .procname = "drop_caches",
1233 .data = &sysctl_drop_caches,
1234 .maxlen = sizeof(int),
1235 .mode = 0644,
1236 .proc_handler = drop_caches_sysctl_handler,
1237 .extra1 = &one,
1238 .extra2 = &three,
1239 },
1240 #ifdef CONFIG_COMPACTION
1241 {
1242 .procname = "compact_memory",
1243 .data = &sysctl_compact_memory,
1244 .maxlen = sizeof(int),
1245 .mode = 0200,
1246 .proc_handler = sysctl_compaction_handler,
1247 },
1248 {
1249 .procname = "extfrag_threshold",
1250 .data = &sysctl_extfrag_threshold,
1251 .maxlen = sizeof(int),
1252 .mode = 0644,
1253 .proc_handler = sysctl_extfrag_handler,
1254 .extra1 = &min_extfrag_threshold,
1255 .extra2 = &max_extfrag_threshold,
1256 },
1257
1258 #endif /* CONFIG_COMPACTION */
1259 {
1260 .procname = "min_free_kbytes",
1261 .data = &min_free_kbytes,
1262 .maxlen = sizeof(min_free_kbytes),
1263 .mode = 0644,
1264 .proc_handler = min_free_kbytes_sysctl_handler,
1265 .extra1 = &zero,
1266 },
1267 {
1268 .procname = "percpu_pagelist_fraction",
1269 .data = &percpu_pagelist_fraction,
1270 .maxlen = sizeof(percpu_pagelist_fraction),
1271 .mode = 0644,
1272 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1273 .extra1 = &min_percpu_pagelist_fract,
1274 },
1275 #ifdef CONFIG_MMU
1276 {
1277 .procname = "max_map_count",
1278 .data = &sysctl_max_map_count,
1279 .maxlen = sizeof(sysctl_max_map_count),
1280 .mode = 0644,
1281 .proc_handler = proc_dointvec_minmax,
1282 .extra1 = &zero,
1283 },
1284 #else
1285 {
1286 .procname = "nr_trim_pages",
1287 .data = &sysctl_nr_trim_pages,
1288 .maxlen = sizeof(sysctl_nr_trim_pages),
1289 .mode = 0644,
1290 .proc_handler = proc_dointvec_minmax,
1291 .extra1 = &zero,
1292 },
1293 #endif
1294 {
1295 .procname = "laptop_mode",
1296 .data = &laptop_mode,
1297 .maxlen = sizeof(laptop_mode),
1298 .mode = 0644,
1299 .proc_handler = proc_dointvec_jiffies,
1300 },
1301 {
1302 .procname = "block_dump",
1303 .data = &block_dump,
1304 .maxlen = sizeof(block_dump),
1305 .mode = 0644,
1306 .proc_handler = proc_dointvec,
1307 .extra1 = &zero,
1308 },
1309 {
1310 .procname = "vfs_cache_pressure",
1311 .data = &sysctl_vfs_cache_pressure,
1312 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1313 .mode = 0644,
1314 .proc_handler = proc_dointvec,
1315 .extra1 = &zero,
1316 },
1317 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1318 {
1319 .procname = "legacy_va_layout",
1320 .data = &sysctl_legacy_va_layout,
1321 .maxlen = sizeof(sysctl_legacy_va_layout),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec,
1324 .extra1 = &zero,
1325 },
1326 #endif
1327 #ifdef CONFIG_NUMA
1328 {
1329 .procname = "zone_reclaim_mode",
1330 .data = &zone_reclaim_mode,
1331 .maxlen = sizeof(zone_reclaim_mode),
1332 .mode = 0644,
1333 .proc_handler = proc_dointvec,
1334 .extra1 = &zero,
1335 },
1336 {
1337 .procname = "min_unmapped_ratio",
1338 .data = &sysctl_min_unmapped_ratio,
1339 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1340 .mode = 0644,
1341 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1342 .extra1 = &zero,
1343 .extra2 = &one_hundred,
1344 },
1345 {
1346 .procname = "min_slab_ratio",
1347 .data = &sysctl_min_slab_ratio,
1348 .maxlen = sizeof(sysctl_min_slab_ratio),
1349 .mode = 0644,
1350 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1351 .extra1 = &zero,
1352 .extra2 = &one_hundred,
1353 },
1354 #endif
1355 #ifdef CONFIG_SMP
1356 {
1357 .procname = "stat_interval",
1358 .data = &sysctl_stat_interval,
1359 .maxlen = sizeof(sysctl_stat_interval),
1360 .mode = 0644,
1361 .proc_handler = proc_dointvec_jiffies,
1362 },
1363 #endif
1364 #ifdef CONFIG_MMU
1365 {
1366 .procname = "mmap_min_addr",
1367 .data = &dac_mmap_min_addr,
1368 .maxlen = sizeof(unsigned long),
1369 .mode = 0644,
1370 .proc_handler = mmap_min_addr_handler,
1371 },
1372 #endif
1373 #ifdef CONFIG_NUMA
1374 {
1375 .procname = "numa_zonelist_order",
1376 .data = &numa_zonelist_order,
1377 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1378 .mode = 0644,
1379 .proc_handler = numa_zonelist_order_handler,
1380 },
1381 #endif
1382 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1383 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1384 {
1385 .procname = "vdso_enabled",
1386 .data = &vdso_enabled,
1387 .maxlen = sizeof(vdso_enabled),
1388 .mode = 0644,
1389 .proc_handler = proc_dointvec,
1390 .extra1 = &zero,
1391 },
1392 #endif
1393 #ifdef CONFIG_HIGHMEM
1394 {
1395 .procname = "highmem_is_dirtyable",
1396 .data = &vm_highmem_is_dirtyable,
1397 .maxlen = sizeof(vm_highmem_is_dirtyable),
1398 .mode = 0644,
1399 .proc_handler = proc_dointvec_minmax,
1400 .extra1 = &zero,
1401 .extra2 = &one,
1402 },
1403 #endif
1404 {
1405 .procname = "scan_unevictable_pages",
1406 .data = &scan_unevictable_pages,
1407 .maxlen = sizeof(scan_unevictable_pages),
1408 .mode = 0644,
1409 .proc_handler = scan_unevictable_handler,
1410 },
1411 #ifdef CONFIG_MEMORY_FAILURE
1412 {
1413 .procname = "memory_failure_early_kill",
1414 .data = &sysctl_memory_failure_early_kill,
1415 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1416 .mode = 0644,
1417 .proc_handler = proc_dointvec_minmax,
1418 .extra1 = &zero,
1419 .extra2 = &one,
1420 },
1421 {
1422 .procname = "memory_failure_recovery",
1423 .data = &sysctl_memory_failure_recovery,
1424 .maxlen = sizeof(sysctl_memory_failure_recovery),
1425 .mode = 0644,
1426 .proc_handler = proc_dointvec_minmax,
1427 .extra1 = &zero,
1428 .extra2 = &one,
1429 },
1430 #endif
1431 {
1432 .procname = "user_reserve_kbytes",
1433 .data = &sysctl_user_reserve_kbytes,
1434 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1435 .mode = 0644,
1436 .proc_handler = proc_doulongvec_minmax,
1437 },
1438 {
1439 .procname = "admin_reserve_kbytes",
1440 .data = &sysctl_admin_reserve_kbytes,
1441 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1442 .mode = 0644,
1443 .proc_handler = proc_doulongvec_minmax,
1444 },
1445 { }
1446 };
1447
1448 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1449 static struct ctl_table binfmt_misc_table[] = {
1450 { }
1451 };
1452 #endif
1453
1454 static struct ctl_table fs_table[] = {
1455 {
1456 .procname = "inode-nr",
1457 .data = &inodes_stat,
1458 .maxlen = 2*sizeof(int),
1459 .mode = 0444,
1460 .proc_handler = proc_nr_inodes,
1461 },
1462 {
1463 .procname = "inode-state",
1464 .data = &inodes_stat,
1465 .maxlen = 7*sizeof(int),
1466 .mode = 0444,
1467 .proc_handler = proc_nr_inodes,
1468 },
1469 {
1470 .procname = "file-nr",
1471 .data = &files_stat,
1472 .maxlen = sizeof(files_stat),
1473 .mode = 0444,
1474 .proc_handler = proc_nr_files,
1475 },
1476 {
1477 .procname = "file-max",
1478 .data = &files_stat.max_files,
1479 .maxlen = sizeof(files_stat.max_files),
1480 .mode = 0644,
1481 .proc_handler = proc_doulongvec_minmax,
1482 },
1483 {
1484 .procname = "nr_open",
1485 .data = &sysctl_nr_open,
1486 .maxlen = sizeof(int),
1487 .mode = 0644,
1488 .proc_handler = proc_dointvec_minmax,
1489 .extra1 = &sysctl_nr_open_min,
1490 .extra2 = &sysctl_nr_open_max,
1491 },
1492 {
1493 .procname = "dentry-state",
1494 .data = &dentry_stat,
1495 .maxlen = 6*sizeof(int),
1496 .mode = 0444,
1497 .proc_handler = proc_nr_dentry,
1498 },
1499 {
1500 .procname = "overflowuid",
1501 .data = &fs_overflowuid,
1502 .maxlen = sizeof(int),
1503 .mode = 0644,
1504 .proc_handler = proc_dointvec_minmax,
1505 .extra1 = &minolduid,
1506 .extra2 = &maxolduid,
1507 },
1508 {
1509 .procname = "overflowgid",
1510 .data = &fs_overflowgid,
1511 .maxlen = sizeof(int),
1512 .mode = 0644,
1513 .proc_handler = proc_dointvec_minmax,
1514 .extra1 = &minolduid,
1515 .extra2 = &maxolduid,
1516 },
1517 #ifdef CONFIG_FILE_LOCKING
1518 {
1519 .procname = "leases-enable",
1520 .data = &leases_enable,
1521 .maxlen = sizeof(int),
1522 .mode = 0644,
1523 .proc_handler = proc_dointvec,
1524 },
1525 #endif
1526 #ifdef CONFIG_DNOTIFY
1527 {
1528 .procname = "dir-notify-enable",
1529 .data = &dir_notify_enable,
1530 .maxlen = sizeof(int),
1531 .mode = 0644,
1532 .proc_handler = proc_dointvec,
1533 },
1534 #endif
1535 #ifdef CONFIG_MMU
1536 #ifdef CONFIG_FILE_LOCKING
1537 {
1538 .procname = "lease-break-time",
1539 .data = &lease_break_time,
1540 .maxlen = sizeof(int),
1541 .mode = 0644,
1542 .proc_handler = proc_dointvec,
1543 },
1544 #endif
1545 #ifdef CONFIG_AIO
1546 {
1547 .procname = "aio-nr",
1548 .data = &aio_nr,
1549 .maxlen = sizeof(aio_nr),
1550 .mode = 0444,
1551 .proc_handler = proc_doulongvec_minmax,
1552 },
1553 {
1554 .procname = "aio-max-nr",
1555 .data = &aio_max_nr,
1556 .maxlen = sizeof(aio_max_nr),
1557 .mode = 0644,
1558 .proc_handler = proc_doulongvec_minmax,
1559 },
1560 #endif /* CONFIG_AIO */
1561 #ifdef CONFIG_INOTIFY_USER
1562 {
1563 .procname = "inotify",
1564 .mode = 0555,
1565 .child = inotify_table,
1566 },
1567 #endif
1568 #ifdef CONFIG_EPOLL
1569 {
1570 .procname = "epoll",
1571 .mode = 0555,
1572 .child = epoll_table,
1573 },
1574 #endif
1575 #endif
1576 {
1577 .procname = "protected_symlinks",
1578 .data = &sysctl_protected_symlinks,
1579 .maxlen = sizeof(int),
1580 .mode = 0600,
1581 .proc_handler = proc_dointvec_minmax,
1582 .extra1 = &zero,
1583 .extra2 = &one,
1584 },
1585 {
1586 .procname = "protected_hardlinks",
1587 .data = &sysctl_protected_hardlinks,
1588 .maxlen = sizeof(int),
1589 .mode = 0600,
1590 .proc_handler = proc_dointvec_minmax,
1591 .extra1 = &zero,
1592 .extra2 = &one,
1593 },
1594 {
1595 .procname = "suid_dumpable",
1596 .data = &suid_dumpable,
1597 .maxlen = sizeof(int),
1598 .mode = 0644,
1599 .proc_handler = proc_dointvec_minmax_coredump,
1600 .extra1 = &zero,
1601 .extra2 = &two,
1602 },
1603 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1604 {
1605 .procname = "binfmt_misc",
1606 .mode = 0555,
1607 .child = binfmt_misc_table,
1608 },
1609 #endif
1610 {
1611 .procname = "pipe-max-size",
1612 .data = &pipe_max_size,
1613 .maxlen = sizeof(int),
1614 .mode = 0644,
1615 .proc_handler = &pipe_proc_fn,
1616 .extra1 = &pipe_min_size,
1617 },
1618 { }
1619 };
1620
1621 static struct ctl_table debug_table[] = {
1622 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1623 {
1624 .procname = "exception-trace",
1625 .data = &show_unhandled_signals,
1626 .maxlen = sizeof(int),
1627 .mode = 0644,
1628 .proc_handler = proc_dointvec
1629 },
1630 #endif
1631 #if defined(CONFIG_OPTPROBES)
1632 {
1633 .procname = "kprobes-optimization",
1634 .data = &sysctl_kprobes_optimization,
1635 .maxlen = sizeof(int),
1636 .mode = 0644,
1637 .proc_handler = proc_kprobes_optimization_handler,
1638 .extra1 = &zero,
1639 .extra2 = &one,
1640 },
1641 #endif
1642 { }
1643 };
1644
1645 static struct ctl_table dev_table[] = {
1646 { }
1647 };
1648
1649 int __init sysctl_init(void)
1650 {
1651 struct ctl_table_header *hdr;
1652
1653 hdr = register_sysctl_table(sysctl_base_table);
1654 kmemleak_not_leak(hdr);
1655 return 0;
1656 }
1657
1658 #endif /* CONFIG_SYSCTL */
1659
1660 /*
1661 * /proc/sys support
1662 */
1663
1664 #ifdef CONFIG_PROC_SYSCTL
1665
1666 static int _proc_do_string(void* data, int maxlen, int write,
1667 void __user *buffer,
1668 size_t *lenp, loff_t *ppos)
1669 {
1670 size_t len;
1671 char __user *p;
1672 char c;
1673
1674 if (!data || !maxlen || !*lenp) {
1675 *lenp = 0;
1676 return 0;
1677 }
1678
1679 if (write) {
1680 len = 0;
1681 p = buffer;
1682 while (len < *lenp) {
1683 if (get_user(c, p++))
1684 return -EFAULT;
1685 if (c == 0 || c == '\n')
1686 break;
1687 len++;
1688 }
1689 if (len >= maxlen)
1690 len = maxlen-1;
1691 if(copy_from_user(data, buffer, len))
1692 return -EFAULT;
1693 ((char *) data)[len] = 0;
1694 *ppos += *lenp;
1695 } else {
1696 len = strlen(data);
1697 if (len > maxlen)
1698 len = maxlen;
1699
1700 if (*ppos > len) {
1701 *lenp = 0;
1702 return 0;
1703 }
1704
1705 data += *ppos;
1706 len -= *ppos;
1707
1708 if (len > *lenp)
1709 len = *lenp;
1710 if (len)
1711 if(copy_to_user(buffer, data, len))
1712 return -EFAULT;
1713 if (len < *lenp) {
1714 if(put_user('\n', ((char __user *) buffer) + len))
1715 return -EFAULT;
1716 len++;
1717 }
1718 *lenp = len;
1719 *ppos += len;
1720 }
1721 return 0;
1722 }
1723
1724 /**
1725 * proc_dostring - read a string sysctl
1726 * @table: the sysctl table
1727 * @write: %TRUE if this is a write to the sysctl file
1728 * @buffer: the user buffer
1729 * @lenp: the size of the user buffer
1730 * @ppos: file position
1731 *
1732 * Reads/writes a string from/to the user buffer. If the kernel
1733 * buffer provided is not large enough to hold the string, the
1734 * string is truncated. The copied string is %NULL-terminated.
1735 * If the string is being read by the user process, it is copied
1736 * and a newline '\n' is added. It is truncated if the buffer is
1737 * not large enough.
1738 *
1739 * Returns 0 on success.
1740 */
1741 int proc_dostring(struct ctl_table *table, int write,
1742 void __user *buffer, size_t *lenp, loff_t *ppos)
1743 {
1744 return _proc_do_string(table->data, table->maxlen, write,
1745 buffer, lenp, ppos);
1746 }
1747
1748 static size_t proc_skip_spaces(char **buf)
1749 {
1750 size_t ret;
1751 char *tmp = skip_spaces(*buf);
1752 ret = tmp - *buf;
1753 *buf = tmp;
1754 return ret;
1755 }
1756
1757 static void proc_skip_char(char **buf, size_t *size, const char v)
1758 {
1759 while (*size) {
1760 if (**buf != v)
1761 break;
1762 (*size)--;
1763 (*buf)++;
1764 }
1765 }
1766
1767 #define TMPBUFLEN 22
1768 /**
1769 * proc_get_long - reads an ASCII formatted integer from a user buffer
1770 *
1771 * @buf: a kernel buffer
1772 * @size: size of the kernel buffer
1773 * @val: this is where the number will be stored
1774 * @neg: set to %TRUE if number is negative
1775 * @perm_tr: a vector which contains the allowed trailers
1776 * @perm_tr_len: size of the perm_tr vector
1777 * @tr: pointer to store the trailer character
1778 *
1779 * In case of success %0 is returned and @buf and @size are updated with
1780 * the amount of bytes read. If @tr is non-NULL and a trailing
1781 * character exists (size is non-zero after returning from this
1782 * function), @tr is updated with the trailing character.
1783 */
1784 static int proc_get_long(char **buf, size_t *size,
1785 unsigned long *val, bool *neg,
1786 const char *perm_tr, unsigned perm_tr_len, char *tr)
1787 {
1788 int len;
1789 char *p, tmp[TMPBUFLEN];
1790
1791 if (!*size)
1792 return -EINVAL;
1793
1794 len = *size;
1795 if (len > TMPBUFLEN - 1)
1796 len = TMPBUFLEN - 1;
1797
1798 memcpy(tmp, *buf, len);
1799
1800 tmp[len] = 0;
1801 p = tmp;
1802 if (*p == '-' && *size > 1) {
1803 *neg = true;
1804 p++;
1805 } else
1806 *neg = false;
1807 if (!isdigit(*p))
1808 return -EINVAL;
1809
1810 *val = simple_strtoul(p, &p, 0);
1811
1812 len = p - tmp;
1813
1814 /* We don't know if the next char is whitespace thus we may accept
1815 * invalid integers (e.g. 1234...a) or two integers instead of one
1816 * (e.g. 123...1). So lets not allow such large numbers. */
1817 if (len == TMPBUFLEN - 1)
1818 return -EINVAL;
1819
1820 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1821 return -EINVAL;
1822
1823 if (tr && (len < *size))
1824 *tr = *p;
1825
1826 *buf += len;
1827 *size -= len;
1828
1829 return 0;
1830 }
1831
1832 /**
1833 * proc_put_long - converts an integer to a decimal ASCII formatted string
1834 *
1835 * @buf: the user buffer
1836 * @size: the size of the user buffer
1837 * @val: the integer to be converted
1838 * @neg: sign of the number, %TRUE for negative
1839 *
1840 * In case of success %0 is returned and @buf and @size are updated with
1841 * the amount of bytes written.
1842 */
1843 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1844 bool neg)
1845 {
1846 int len;
1847 char tmp[TMPBUFLEN], *p = tmp;
1848
1849 sprintf(p, "%s%lu", neg ? "-" : "", val);
1850 len = strlen(tmp);
1851 if (len > *size)
1852 len = *size;
1853 if (copy_to_user(*buf, tmp, len))
1854 return -EFAULT;
1855 *size -= len;
1856 *buf += len;
1857 return 0;
1858 }
1859 #undef TMPBUFLEN
1860
1861 static int proc_put_char(void __user **buf, size_t *size, char c)
1862 {
1863 if (*size) {
1864 char __user **buffer = (char __user **)buf;
1865 if (put_user(c, *buffer))
1866 return -EFAULT;
1867 (*size)--, (*buffer)++;
1868 *buf = *buffer;
1869 }
1870 return 0;
1871 }
1872
1873 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1874 int *valp,
1875 int write, void *data)
1876 {
1877 if (write) {
1878 *valp = *negp ? -*lvalp : *lvalp;
1879 } else {
1880 int val = *valp;
1881 if (val < 0) {
1882 *negp = true;
1883 *lvalp = (unsigned long)-val;
1884 } else {
1885 *negp = false;
1886 *lvalp = (unsigned long)val;
1887 }
1888 }
1889 return 0;
1890 }
1891
1892 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1893
1894 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1895 int write, void __user *buffer,
1896 size_t *lenp, loff_t *ppos,
1897 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1898 int write, void *data),
1899 void *data)
1900 {
1901 int *i, vleft, first = 1, err = 0;
1902 unsigned long page = 0;
1903 size_t left;
1904 char *kbuf;
1905
1906 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1907 *lenp = 0;
1908 return 0;
1909 }
1910
1911 i = (int *) tbl_data;
1912 vleft = table->maxlen / sizeof(*i);
1913 left = *lenp;
1914
1915 if (!conv)
1916 conv = do_proc_dointvec_conv;
1917
1918 if (write) {
1919 if (left > PAGE_SIZE - 1)
1920 left = PAGE_SIZE - 1;
1921 page = __get_free_page(GFP_TEMPORARY);
1922 kbuf = (char *) page;
1923 if (!kbuf)
1924 return -ENOMEM;
1925 if (copy_from_user(kbuf, buffer, left)) {
1926 err = -EFAULT;
1927 goto free;
1928 }
1929 kbuf[left] = 0;
1930 }
1931
1932 for (; left && vleft--; i++, first=0) {
1933 unsigned long lval;
1934 bool neg;
1935
1936 if (write) {
1937 left -= proc_skip_spaces(&kbuf);
1938
1939 if (!left)
1940 break;
1941 err = proc_get_long(&kbuf, &left, &lval, &neg,
1942 proc_wspace_sep,
1943 sizeof(proc_wspace_sep), NULL);
1944 if (err)
1945 break;
1946 if (conv(&neg, &lval, i, 1, data)) {
1947 err = -EINVAL;
1948 break;
1949 }
1950 } else {
1951 if (conv(&neg, &lval, i, 0, data)) {
1952 err = -EINVAL;
1953 break;
1954 }
1955 if (!first)
1956 err = proc_put_char(&buffer, &left, '\t');
1957 if (err)
1958 break;
1959 err = proc_put_long(&buffer, &left, lval, neg);
1960 if (err)
1961 break;
1962 }
1963 }
1964
1965 if (!write && !first && left && !err)
1966 err = proc_put_char(&buffer, &left, '\n');
1967 if (write && !err && left)
1968 left -= proc_skip_spaces(&kbuf);
1969 free:
1970 if (write) {
1971 free_page(page);
1972 if (first)
1973 return err ? : -EINVAL;
1974 }
1975 *lenp -= left;
1976 *ppos += *lenp;
1977 return err;
1978 }
1979
1980 static int do_proc_dointvec(struct ctl_table *table, int write,
1981 void __user *buffer, size_t *lenp, loff_t *ppos,
1982 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1983 int write, void *data),
1984 void *data)
1985 {
1986 return __do_proc_dointvec(table->data, table, write,
1987 buffer, lenp, ppos, conv, data);
1988 }
1989
1990 /**
1991 * proc_dointvec - read a vector of integers
1992 * @table: the sysctl table
1993 * @write: %TRUE if this is a write to the sysctl file
1994 * @buffer: the user buffer
1995 * @lenp: the size of the user buffer
1996 * @ppos: file position
1997 *
1998 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1999 * values from/to the user buffer, treated as an ASCII string.
2000 *
2001 * Returns 0 on success.
2002 */
2003 int proc_dointvec(struct ctl_table *table, int write,
2004 void __user *buffer, size_t *lenp, loff_t *ppos)
2005 {
2006 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2007 NULL,NULL);
2008 }
2009
2010 /*
2011 * Taint values can only be increased
2012 * This means we can safely use a temporary.
2013 */
2014 static int proc_taint(struct ctl_table *table, int write,
2015 void __user *buffer, size_t *lenp, loff_t *ppos)
2016 {
2017 struct ctl_table t;
2018 unsigned long tmptaint = get_taint();
2019 int err;
2020
2021 if (write && !capable(CAP_SYS_ADMIN))
2022 return -EPERM;
2023
2024 t = *table;
2025 t.data = &tmptaint;
2026 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2027 if (err < 0)
2028 return err;
2029
2030 if (write) {
2031 /*
2032 * Poor man's atomic or. Not worth adding a primitive
2033 * to everyone's atomic.h for this
2034 */
2035 int i;
2036 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2037 if ((tmptaint >> i) & 1)
2038 add_taint(i, LOCKDEP_STILL_OK);
2039 }
2040 }
2041
2042 return err;
2043 }
2044
2045 #ifdef CONFIG_PRINTK
2046 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2047 void __user *buffer, size_t *lenp, loff_t *ppos)
2048 {
2049 if (write && !capable(CAP_SYS_ADMIN))
2050 return -EPERM;
2051
2052 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2053 }
2054 #endif
2055
2056 struct do_proc_dointvec_minmax_conv_param {
2057 int *min;
2058 int *max;
2059 };
2060
2061 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2062 int *valp,
2063 int write, void *data)
2064 {
2065 struct do_proc_dointvec_minmax_conv_param *param = data;
2066 if (write) {
2067 int val = *negp ? -*lvalp : *lvalp;
2068 if ((param->min && *param->min > val) ||
2069 (param->max && *param->max < val))
2070 return -EINVAL;
2071 *valp = val;
2072 } else {
2073 int val = *valp;
2074 if (val < 0) {
2075 *negp = true;
2076 *lvalp = (unsigned long)-val;
2077 } else {
2078 *negp = false;
2079 *lvalp = (unsigned long)val;
2080 }
2081 }
2082 return 0;
2083 }
2084
2085 /**
2086 * proc_dointvec_minmax - read a vector of integers with min/max values
2087 * @table: the sysctl table
2088 * @write: %TRUE if this is a write to the sysctl file
2089 * @buffer: the user buffer
2090 * @lenp: the size of the user buffer
2091 * @ppos: file position
2092 *
2093 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2094 * values from/to the user buffer, treated as an ASCII string.
2095 *
2096 * This routine will ensure the values are within the range specified by
2097 * table->extra1 (min) and table->extra2 (max).
2098 *
2099 * Returns 0 on success.
2100 */
2101 int proc_dointvec_minmax(struct ctl_table *table, int write,
2102 void __user *buffer, size_t *lenp, loff_t *ppos)
2103 {
2104 struct do_proc_dointvec_minmax_conv_param param = {
2105 .min = (int *) table->extra1,
2106 .max = (int *) table->extra2,
2107 };
2108 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2109 do_proc_dointvec_minmax_conv, &param);
2110 }
2111
2112 static void validate_coredump_safety(void)
2113 {
2114 #ifdef CONFIG_COREDUMP
2115 if (suid_dumpable == SUID_DUMP_ROOT &&
2116 core_pattern[0] != '/' && core_pattern[0] != '|') {
2117 printk(KERN_WARNING "Unsafe core_pattern used with "\
2118 "suid_dumpable=2. Pipe handler or fully qualified "\
2119 "core dump path required.\n");
2120 }
2121 #endif
2122 }
2123
2124 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2125 void __user *buffer, size_t *lenp, loff_t *ppos)
2126 {
2127 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2128 if (!error)
2129 validate_coredump_safety();
2130 return error;
2131 }
2132
2133 #ifdef CONFIG_COREDUMP
2134 static int proc_dostring_coredump(struct ctl_table *table, int write,
2135 void __user *buffer, size_t *lenp, loff_t *ppos)
2136 {
2137 int error = proc_dostring(table, write, buffer, lenp, ppos);
2138 if (!error)
2139 validate_coredump_safety();
2140 return error;
2141 }
2142 #endif
2143
2144 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2145 void __user *buffer,
2146 size_t *lenp, loff_t *ppos,
2147 unsigned long convmul,
2148 unsigned long convdiv)
2149 {
2150 unsigned long *i, *min, *max;
2151 int vleft, first = 1, err = 0;
2152 unsigned long page = 0;
2153 size_t left;
2154 char *kbuf;
2155
2156 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2157 *lenp = 0;
2158 return 0;
2159 }
2160
2161 i = (unsigned long *) data;
2162 min = (unsigned long *) table->extra1;
2163 max = (unsigned long *) table->extra2;
2164 vleft = table->maxlen / sizeof(unsigned long);
2165 left = *lenp;
2166
2167 if (write) {
2168 if (left > PAGE_SIZE - 1)
2169 left = PAGE_SIZE - 1;
2170 page = __get_free_page(GFP_TEMPORARY);
2171 kbuf = (char *) page;
2172 if (!kbuf)
2173 return -ENOMEM;
2174 if (copy_from_user(kbuf, buffer, left)) {
2175 err = -EFAULT;
2176 goto free;
2177 }
2178 kbuf[left] = 0;
2179 }
2180
2181 for (; left && vleft--; i++, first = 0) {
2182 unsigned long val;
2183
2184 if (write) {
2185 bool neg;
2186
2187 left -= proc_skip_spaces(&kbuf);
2188
2189 err = proc_get_long(&kbuf, &left, &val, &neg,
2190 proc_wspace_sep,
2191 sizeof(proc_wspace_sep), NULL);
2192 if (err)
2193 break;
2194 if (neg)
2195 continue;
2196 if ((min && val < *min) || (max && val > *max))
2197 continue;
2198 *i = val;
2199 } else {
2200 val = convdiv * (*i) / convmul;
2201 if (!first)
2202 err = proc_put_char(&buffer, &left, '\t');
2203 err = proc_put_long(&buffer, &left, val, false);
2204 if (err)
2205 break;
2206 }
2207 }
2208
2209 if (!write && !first && left && !err)
2210 err = proc_put_char(&buffer, &left, '\n');
2211 if (write && !err)
2212 left -= proc_skip_spaces(&kbuf);
2213 free:
2214 if (write) {
2215 free_page(page);
2216 if (first)
2217 return err ? : -EINVAL;
2218 }
2219 *lenp -= left;
2220 *ppos += *lenp;
2221 return err;
2222 }
2223
2224 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2225 void __user *buffer,
2226 size_t *lenp, loff_t *ppos,
2227 unsigned long convmul,
2228 unsigned long convdiv)
2229 {
2230 return __do_proc_doulongvec_minmax(table->data, table, write,
2231 buffer, lenp, ppos, convmul, convdiv);
2232 }
2233
2234 /**
2235 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2236 * @table: the sysctl table
2237 * @write: %TRUE if this is a write to the sysctl file
2238 * @buffer: the user buffer
2239 * @lenp: the size of the user buffer
2240 * @ppos: file position
2241 *
2242 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2243 * values from/to the user buffer, treated as an ASCII string.
2244 *
2245 * This routine will ensure the values are within the range specified by
2246 * table->extra1 (min) and table->extra2 (max).
2247 *
2248 * Returns 0 on success.
2249 */
2250 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2251 void __user *buffer, size_t *lenp, loff_t *ppos)
2252 {
2253 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2254 }
2255
2256 /**
2257 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2258 * @table: the sysctl table
2259 * @write: %TRUE if this is a write to the sysctl file
2260 * @buffer: the user buffer
2261 * @lenp: the size of the user buffer
2262 * @ppos: file position
2263 *
2264 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2265 * values from/to the user buffer, treated as an ASCII string. The values
2266 * are treated as milliseconds, and converted to jiffies when they are stored.
2267 *
2268 * This routine will ensure the values are within the range specified by
2269 * table->extra1 (min) and table->extra2 (max).
2270 *
2271 * Returns 0 on success.
2272 */
2273 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2274 void __user *buffer,
2275 size_t *lenp, loff_t *ppos)
2276 {
2277 return do_proc_doulongvec_minmax(table, write, buffer,
2278 lenp, ppos, HZ, 1000l);
2279 }
2280
2281
2282 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2283 int *valp,
2284 int write, void *data)
2285 {
2286 if (write) {
2287 if (*lvalp > LONG_MAX / HZ)
2288 return 1;
2289 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2290 } else {
2291 int val = *valp;
2292 unsigned long lval;
2293 if (val < 0) {
2294 *negp = true;
2295 lval = (unsigned long)-val;
2296 } else {
2297 *negp = false;
2298 lval = (unsigned long)val;
2299 }
2300 *lvalp = lval / HZ;
2301 }
2302 return 0;
2303 }
2304
2305 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2306 int *valp,
2307 int write, void *data)
2308 {
2309 if (write) {
2310 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2311 return 1;
2312 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2313 } else {
2314 int val = *valp;
2315 unsigned long lval;
2316 if (val < 0) {
2317 *negp = true;
2318 lval = (unsigned long)-val;
2319 } else {
2320 *negp = false;
2321 lval = (unsigned long)val;
2322 }
2323 *lvalp = jiffies_to_clock_t(lval);
2324 }
2325 return 0;
2326 }
2327
2328 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2329 int *valp,
2330 int write, void *data)
2331 {
2332 if (write) {
2333 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2334 } else {
2335 int val = *valp;
2336 unsigned long lval;
2337 if (val < 0) {
2338 *negp = true;
2339 lval = (unsigned long)-val;
2340 } else {
2341 *negp = false;
2342 lval = (unsigned long)val;
2343 }
2344 *lvalp = jiffies_to_msecs(lval);
2345 }
2346 return 0;
2347 }
2348
2349 /**
2350 * proc_dointvec_jiffies - read a vector of integers as seconds
2351 * @table: the sysctl table
2352 * @write: %TRUE if this is a write to the sysctl file
2353 * @buffer: the user buffer
2354 * @lenp: the size of the user buffer
2355 * @ppos: file position
2356 *
2357 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2358 * values from/to the user buffer, treated as an ASCII string.
2359 * The values read are assumed to be in seconds, and are converted into
2360 * jiffies.
2361 *
2362 * Returns 0 on success.
2363 */
2364 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2365 void __user *buffer, size_t *lenp, loff_t *ppos)
2366 {
2367 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2368 do_proc_dointvec_jiffies_conv,NULL);
2369 }
2370
2371 /**
2372 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2373 * @table: the sysctl table
2374 * @write: %TRUE if this is a write to the sysctl file
2375 * @buffer: the user buffer
2376 * @lenp: the size of the user buffer
2377 * @ppos: pointer to the file position
2378 *
2379 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2380 * values from/to the user buffer, treated as an ASCII string.
2381 * The values read are assumed to be in 1/USER_HZ seconds, and
2382 * are converted into jiffies.
2383 *
2384 * Returns 0 on success.
2385 */
2386 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2387 void __user *buffer, size_t *lenp, loff_t *ppos)
2388 {
2389 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2390 do_proc_dointvec_userhz_jiffies_conv,NULL);
2391 }
2392
2393 /**
2394 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2395 * @table: the sysctl table
2396 * @write: %TRUE if this is a write to the sysctl file
2397 * @buffer: the user buffer
2398 * @lenp: the size of the user buffer
2399 * @ppos: file position
2400 * @ppos: the current position in the file
2401 *
2402 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2403 * values from/to the user buffer, treated as an ASCII string.
2404 * The values read are assumed to be in 1/1000 seconds, and
2405 * are converted into jiffies.
2406 *
2407 * Returns 0 on success.
2408 */
2409 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2410 void __user *buffer, size_t *lenp, loff_t *ppos)
2411 {
2412 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2413 do_proc_dointvec_ms_jiffies_conv, NULL);
2414 }
2415
2416 static int proc_do_cad_pid(struct ctl_table *table, int write,
2417 void __user *buffer, size_t *lenp, loff_t *ppos)
2418 {
2419 struct pid *new_pid;
2420 pid_t tmp;
2421 int r;
2422
2423 tmp = pid_vnr(cad_pid);
2424
2425 r = __do_proc_dointvec(&tmp, table, write, buffer,
2426 lenp, ppos, NULL, NULL);
2427 if (r || !write)
2428 return r;
2429
2430 new_pid = find_get_pid(tmp);
2431 if (!new_pid)
2432 return -ESRCH;
2433
2434 put_pid(xchg(&cad_pid, new_pid));
2435 return 0;
2436 }
2437
2438 /**
2439 * proc_do_large_bitmap - read/write from/to a large bitmap
2440 * @table: the sysctl table
2441 * @write: %TRUE if this is a write to the sysctl file
2442 * @buffer: the user buffer
2443 * @lenp: the size of the user buffer
2444 * @ppos: file position
2445 *
2446 * The bitmap is stored at table->data and the bitmap length (in bits)
2447 * in table->maxlen.
2448 *
2449 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2450 * large bitmaps may be represented in a compact manner. Writing into
2451 * the file will clear the bitmap then update it with the given input.
2452 *
2453 * Returns 0 on success.
2454 */
2455 int proc_do_large_bitmap(struct ctl_table *table, int write,
2456 void __user *buffer, size_t *lenp, loff_t *ppos)
2457 {
2458 int err = 0;
2459 bool first = 1;
2460 size_t left = *lenp;
2461 unsigned long bitmap_len = table->maxlen;
2462 unsigned long *bitmap = (unsigned long *) table->data;
2463 unsigned long *tmp_bitmap = NULL;
2464 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2465
2466 if (!bitmap_len || !left || (*ppos && !write)) {
2467 *lenp = 0;
2468 return 0;
2469 }
2470
2471 if (write) {
2472 unsigned long page = 0;
2473 char *kbuf;
2474
2475 if (left > PAGE_SIZE - 1)
2476 left = PAGE_SIZE - 1;
2477
2478 page = __get_free_page(GFP_TEMPORARY);
2479 kbuf = (char *) page;
2480 if (!kbuf)
2481 return -ENOMEM;
2482 if (copy_from_user(kbuf, buffer, left)) {
2483 free_page(page);
2484 return -EFAULT;
2485 }
2486 kbuf[left] = 0;
2487
2488 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2489 GFP_KERNEL);
2490 if (!tmp_bitmap) {
2491 free_page(page);
2492 return -ENOMEM;
2493 }
2494 proc_skip_char(&kbuf, &left, '\n');
2495 while (!err && left) {
2496 unsigned long val_a, val_b;
2497 bool neg;
2498
2499 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2500 sizeof(tr_a), &c);
2501 if (err)
2502 break;
2503 if (val_a >= bitmap_len || neg) {
2504 err = -EINVAL;
2505 break;
2506 }
2507
2508 val_b = val_a;
2509 if (left) {
2510 kbuf++;
2511 left--;
2512 }
2513
2514 if (c == '-') {
2515 err = proc_get_long(&kbuf, &left, &val_b,
2516 &neg, tr_b, sizeof(tr_b),
2517 &c);
2518 if (err)
2519 break;
2520 if (val_b >= bitmap_len || neg ||
2521 val_a > val_b) {
2522 err = -EINVAL;
2523 break;
2524 }
2525 if (left) {
2526 kbuf++;
2527 left--;
2528 }
2529 }
2530
2531 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2532 first = 0;
2533 proc_skip_char(&kbuf, &left, '\n');
2534 }
2535 free_page(page);
2536 } else {
2537 unsigned long bit_a, bit_b = 0;
2538
2539 while (left) {
2540 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2541 if (bit_a >= bitmap_len)
2542 break;
2543 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2544 bit_a + 1) - 1;
2545
2546 if (!first) {
2547 err = proc_put_char(&buffer, &left, ',');
2548 if (err)
2549 break;
2550 }
2551 err = proc_put_long(&buffer, &left, bit_a, false);
2552 if (err)
2553 break;
2554 if (bit_a != bit_b) {
2555 err = proc_put_char(&buffer, &left, '-');
2556 if (err)
2557 break;
2558 err = proc_put_long(&buffer, &left, bit_b, false);
2559 if (err)
2560 break;
2561 }
2562
2563 first = 0; bit_b++;
2564 }
2565 if (!err)
2566 err = proc_put_char(&buffer, &left, '\n');
2567 }
2568
2569 if (!err) {
2570 if (write) {
2571 if (*ppos)
2572 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2573 else
2574 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2575 }
2576 kfree(tmp_bitmap);
2577 *lenp -= left;
2578 *ppos += *lenp;
2579 return 0;
2580 } else {
2581 kfree(tmp_bitmap);
2582 return err;
2583 }
2584 }
2585
2586 #else /* CONFIG_PROC_SYSCTL */
2587
2588 int proc_dostring(struct ctl_table *table, int write,
2589 void __user *buffer, size_t *lenp, loff_t *ppos)
2590 {
2591 return -ENOSYS;
2592 }
2593
2594 int proc_dointvec(struct ctl_table *table, int write,
2595 void __user *buffer, size_t *lenp, loff_t *ppos)
2596 {
2597 return -ENOSYS;
2598 }
2599
2600 int proc_dointvec_minmax(struct ctl_table *table, int write,
2601 void __user *buffer, size_t *lenp, loff_t *ppos)
2602 {
2603 return -ENOSYS;
2604 }
2605
2606 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2607 void __user *buffer, size_t *lenp, loff_t *ppos)
2608 {
2609 return -ENOSYS;
2610 }
2611
2612 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2613 void __user *buffer, size_t *lenp, loff_t *ppos)
2614 {
2615 return -ENOSYS;
2616 }
2617
2618 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2619 void __user *buffer, size_t *lenp, loff_t *ppos)
2620 {
2621 return -ENOSYS;
2622 }
2623
2624 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2625 void __user *buffer, size_t *lenp, loff_t *ppos)
2626 {
2627 return -ENOSYS;
2628 }
2629
2630 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2631 void __user *buffer,
2632 size_t *lenp, loff_t *ppos)
2633 {
2634 return -ENOSYS;
2635 }
2636
2637
2638 #endif /* CONFIG_PROC_SYSCTL */
2639
2640 /*
2641 * No sense putting this after each symbol definition, twice,
2642 * exception granted :-)
2643 */
2644 EXPORT_SYMBOL(proc_dointvec);
2645 EXPORT_SYMBOL(proc_dointvec_jiffies);
2646 EXPORT_SYMBOL(proc_dointvec_minmax);
2647 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2648 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2649 EXPORT_SYMBOL(proc_dostring);
2650 EXPORT_SYMBOL(proc_doulongvec_minmax);
2651 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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