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memory-hotplug: consider compound pages when free memmap
[linux-2.6.git] / kernel / sysctl.c
blob467d8b923fcdad7a55dce597e80dd39eab170230
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 min_free_kbytes;
109 extern int pid_max_min, pid_max_max;
110 extern int sysctl_drop_caches;
111 extern int percpu_pagelist_fraction;
112 extern int compat_log;
113 extern int latencytop_enabled;
114 extern int sysctl_nr_open_min, sysctl_nr_open_max;
115 #ifndef CONFIG_MMU
116 extern int sysctl_nr_trim_pages;
117 #endif
118 #ifdef CONFIG_BLOCK
119 extern int blk_iopoll_enabled;
120 #endif
121
122 /* Constants used for minimum and maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty = 60;
125 static int neg_one = -1;
126 #endif
127
128 static int zero;
129 static int __maybe_unused one = 1;
130 static int __maybe_unused two = 2;
131 static int __maybe_unused three = 3;
132 static unsigned long one_ul = 1;
133 static int one_hundred = 100;
134 #ifdef CONFIG_PRINTK
135 static int ten_thousand = 10000;
136 #endif
137
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
144 static int min_percpu_pagelist_fract = 8;
145
146 static int ngroups_max = NGROUPS_MAX;
147 static const int cap_last_cap = CAP_LAST_CAP;
148
149 #ifdef CONFIG_INOTIFY_USER
150 #include <linux/inotify.h>
151 #endif
152 #ifdef CONFIG_SPARC
153 #endif
154
155 #ifdef CONFIG_SPARC64
156 extern int sysctl_tsb_ratio;
157 #endif
158
159 #ifdef __hppa__
160 extern int pwrsw_enabled;
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 {
560 .procname = "unaligned-trap",
561 .data = &unaligned_enabled,
562 .maxlen = sizeof (int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566 #endif
567 {
568 .procname = "ctrl-alt-del",
569 .data = &C_A_D,
570 .maxlen = sizeof(int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec,
573 },
574 #ifdef CONFIG_FUNCTION_TRACER
575 {
576 .procname = "ftrace_enabled",
577 .data = &ftrace_enabled,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = ftrace_enable_sysctl,
581 },
582 #endif
583 #ifdef CONFIG_STACK_TRACER
584 {
585 .procname = "stack_tracer_enabled",
586 .data = &stack_tracer_enabled,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .proc_handler = stack_trace_sysctl,
590 },
591 #endif
592 #ifdef CONFIG_TRACING
593 {
594 .procname = "ftrace_dump_on_oops",
595 .data = &ftrace_dump_on_oops,
596 .maxlen = sizeof(int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec,
599 },
600 #endif
601 #ifdef CONFIG_MODULES
602 {
603 .procname = "modprobe",
604 .data = &modprobe_path,
605 .maxlen = KMOD_PATH_LEN,
606 .mode = 0644,
607 .proc_handler = proc_dostring,
608 },
609 {
610 .procname = "modules_disabled",
611 .data = &modules_disabled,
612 .maxlen = sizeof(int),
613 .mode = 0644,
614 /* only handle a transition from default "0" to "1" */
615 .proc_handler = proc_dointvec_minmax,
616 .extra1 = &one,
617 .extra2 = &one,
618 },
619 #endif
620
621 {
622 .procname = "hotplug",
623 .data = &uevent_helper,
624 .maxlen = UEVENT_HELPER_PATH_LEN,
625 .mode = 0644,
626 .proc_handler = proc_dostring,
627 },
628
629 #ifdef CONFIG_CHR_DEV_SG
630 {
631 .procname = "sg-big-buff",
632 .data = &sg_big_buff,
633 .maxlen = sizeof (int),
634 .mode = 0444,
635 .proc_handler = proc_dointvec,
636 },
637 #endif
638 #ifdef CONFIG_BSD_PROCESS_ACCT
639 {
640 .procname = "acct",
641 .data = &acct_parm,
642 .maxlen = 3*sizeof(int),
643 .mode = 0644,
644 .proc_handler = proc_dointvec,
645 },
646 #endif
647 #ifdef CONFIG_MAGIC_SYSRQ
648 {
649 .procname = "sysrq",
650 .data = &__sysrq_enabled,
651 .maxlen = sizeof (int),
652 .mode = 0644,
653 .proc_handler = sysrq_sysctl_handler,
654 },
655 #endif
656 #ifdef CONFIG_PROC_SYSCTL
657 {
658 .procname = "cad_pid",
659 .data = NULL,
660 .maxlen = sizeof (int),
661 .mode = 0600,
662 .proc_handler = proc_do_cad_pid,
663 },
664 #endif
665 {
666 .procname = "threads-max",
667 .data = &max_threads,
668 .maxlen = sizeof(int),
669 .mode = 0644,
670 .proc_handler = proc_dointvec,
671 },
672 {
673 .procname = "random",
674 .mode = 0555,
675 .child = random_table,
676 },
677 {
678 .procname = "usermodehelper",
679 .mode = 0555,
680 .child = usermodehelper_table,
681 },
682 {
683 .procname = "overflowuid",
684 .data = &overflowuid,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec_minmax,
688 .extra1 = &minolduid,
689 .extra2 = &maxolduid,
690 },
691 {
692 .procname = "overflowgid",
693 .data = &overflowgid,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 .proc_handler = proc_dointvec_minmax,
697 .extra1 = &minolduid,
698 .extra2 = &maxolduid,
699 },
700 #ifdef CONFIG_S390
701 #ifdef CONFIG_MATHEMU
702 {
703 .procname = "ieee_emulation_warnings",
704 .data = &sysctl_ieee_emulation_warnings,
705 .maxlen = sizeof(int),
706 .mode = 0644,
707 .proc_handler = proc_dointvec,
708 },
709 #endif
710 {
711 .procname = "userprocess_debug",
712 .data = &show_unhandled_signals,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 .proc_handler = proc_dointvec,
716 },
717 #endif
718 {
719 .procname = "pid_max",
720 .data = &pid_max,
721 .maxlen = sizeof (int),
722 .mode = 0644,
723 .proc_handler = proc_dointvec_minmax,
724 .extra1 = &pid_max_min,
725 .extra2 = &pid_max_max,
726 },
727 {
728 .procname = "panic_on_oops",
729 .data = &panic_on_oops,
730 .maxlen = sizeof(int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec,
733 },
734 #if defined CONFIG_PRINTK
735 {
736 .procname = "printk",
737 .data = &console_loglevel,
738 .maxlen = 4*sizeof(int),
739 .mode = 0644,
740 .proc_handler = proc_dointvec,
741 },
742 {
743 .procname = "printk_ratelimit",
744 .data = &printk_ratelimit_state.interval,
745 .maxlen = sizeof(int),
746 .mode = 0644,
747 .proc_handler = proc_dointvec_jiffies,
748 },
749 {
750 .procname = "printk_ratelimit_burst",
751 .data = &printk_ratelimit_state.burst,
752 .maxlen = sizeof(int),
753 .mode = 0644,
754 .proc_handler = proc_dointvec,
755 },
756 {
757 .procname = "printk_delay",
758 .data = &printk_delay_msec,
759 .maxlen = sizeof(int),
760 .mode = 0644,
761 .proc_handler = proc_dointvec_minmax,
762 .extra1 = &zero,
763 .extra2 = &ten_thousand,
764 },
765 {
766 .procname = "dmesg_restrict",
767 .data = &dmesg_restrict,
768 .maxlen = sizeof(int),
769 .mode = 0644,
770 .proc_handler = proc_dointvec_minmax_sysadmin,
771 .extra1 = &zero,
772 .extra2 = &one,
773 },
774 {
775 .procname = "kptr_restrict",
776 .data = &kptr_restrict,
777 .maxlen = sizeof(int),
778 .mode = 0644,
779 .proc_handler = proc_dointvec_minmax_sysadmin,
780 .extra1 = &zero,
781 .extra2 = &two,
782 },
783 #endif
784 {
785 .procname = "ngroups_max",
786 .data = &ngroups_max,
787 .maxlen = sizeof (int),
788 .mode = 0444,
789 .proc_handler = proc_dointvec,
790 },
791 {
792 .procname = "cap_last_cap",
793 .data = (void *)&cap_last_cap,
794 .maxlen = sizeof(int),
795 .mode = 0444,
796 .proc_handler = proc_dointvec,
797 },
798 #if defined(CONFIG_LOCKUP_DETECTOR)
799 {
800 .procname = "watchdog",
801 .data = &watchdog_enabled,
802 .maxlen = sizeof (int),
803 .mode = 0644,
804 .proc_handler = proc_dowatchdog,
805 .extra1 = &zero,
806 .extra2 = &one,
807 },
808 {
809 .procname = "watchdog_thresh",
810 .data = &watchdog_thresh,
811 .maxlen = sizeof(int),
812 .mode = 0644,
813 .proc_handler = proc_dowatchdog,
814 .extra1 = &neg_one,
815 .extra2 = &sixty,
816 },
817 {
818 .procname = "softlockup_panic",
819 .data = &softlockup_panic,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dointvec_minmax,
823 .extra1 = &zero,
824 .extra2 = &one,
825 },
826 {
827 .procname = "nmi_watchdog",
828 .data = &watchdog_enabled,
829 .maxlen = sizeof (int),
830 .mode = 0644,
831 .proc_handler = proc_dowatchdog,
832 .extra1 = &zero,
833 .extra2 = &one,
834 },
835 #endif
836 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
837 {
838 .procname = "unknown_nmi_panic",
839 .data = &unknown_nmi_panic,
840 .maxlen = sizeof (int),
841 .mode = 0644,
842 .proc_handler = proc_dointvec,
843 },
844 #endif
845 #if defined(CONFIG_X86)
846 {
847 .procname = "panic_on_unrecovered_nmi",
848 .data = &panic_on_unrecovered_nmi,
849 .maxlen = sizeof(int),
850 .mode = 0644,
851 .proc_handler = proc_dointvec,
852 },
853 {
854 .procname = "panic_on_io_nmi",
855 .data = &panic_on_io_nmi,
856 .maxlen = sizeof(int),
857 .mode = 0644,
858 .proc_handler = proc_dointvec,
859 },
860 #ifdef CONFIG_DEBUG_STACKOVERFLOW
861 {
862 .procname = "panic_on_stackoverflow",
863 .data = &sysctl_panic_on_stackoverflow,
864 .maxlen = sizeof(int),
865 .mode = 0644,
866 .proc_handler = proc_dointvec,
867 },
868 #endif
869 {
870 .procname = "bootloader_type",
871 .data = &bootloader_type,
872 .maxlen = sizeof (int),
873 .mode = 0444,
874 .proc_handler = proc_dointvec,
875 },
876 {
877 .procname = "bootloader_version",
878 .data = &bootloader_version,
879 .maxlen = sizeof (int),
880 .mode = 0444,
881 .proc_handler = proc_dointvec,
882 },
883 {
884 .procname = "kstack_depth_to_print",
885 .data = &kstack_depth_to_print,
886 .maxlen = sizeof(int),
887 .mode = 0644,
888 .proc_handler = proc_dointvec,
889 },
890 {
891 .procname = "io_delay_type",
892 .data = &io_delay_type,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_dointvec,
896 },
897 #endif
898 #if defined(CONFIG_MMU)
899 {
900 .procname = "randomize_va_space",
901 .data = &randomize_va_space,
902 .maxlen = sizeof(int),
903 .mode = 0644,
904 .proc_handler = proc_dointvec,
905 },
906 #endif
907 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
908 {
909 .procname = "spin_retry",
910 .data = &spin_retry,
911 .maxlen = sizeof (int),
912 .mode = 0644,
913 .proc_handler = proc_dointvec,
914 },
915 #endif
916 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
917 {
918 .procname = "acpi_video_flags",
919 .data = &acpi_realmode_flags,
920 .maxlen = sizeof (unsigned long),
921 .mode = 0644,
922 .proc_handler = proc_doulongvec_minmax,
923 },
924 #endif
925 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
926 {
927 .procname = "ignore-unaligned-usertrap",
928 .data = &no_unaligned_warning,
929 .maxlen = sizeof (int),
930 .mode = 0644,
931 .proc_handler = proc_dointvec,
932 },
933 #endif
934 #ifdef CONFIG_IA64
935 {
936 .procname = "unaligned-dump-stack",
937 .data = &unaligned_dump_stack,
938 .maxlen = sizeof (int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec,
941 },
942 #endif
943 #ifdef CONFIG_DETECT_HUNG_TASK
944 {
945 .procname = "hung_task_panic",
946 .data = &sysctl_hung_task_panic,
947 .maxlen = sizeof(int),
948 .mode = 0644,
949 .proc_handler = proc_dointvec_minmax,
950 .extra1 = &zero,
951 .extra2 = &one,
952 },
953 {
954 .procname = "hung_task_check_count",
955 .data = &sysctl_hung_task_check_count,
956 .maxlen = sizeof(unsigned long),
957 .mode = 0644,
958 .proc_handler = proc_doulongvec_minmax,
959 },
960 {
961 .procname = "hung_task_timeout_secs",
962 .data = &sysctl_hung_task_timeout_secs,
963 .maxlen = sizeof(unsigned long),
964 .mode = 0644,
965 .proc_handler = proc_dohung_task_timeout_secs,
966 },
967 {
968 .procname = "hung_task_warnings",
969 .data = &sysctl_hung_task_warnings,
970 .maxlen = sizeof(unsigned long),
971 .mode = 0644,
972 .proc_handler = proc_doulongvec_minmax,
973 },
974 #endif
975 #ifdef CONFIG_COMPAT
976 {
977 .procname = "compat-log",
978 .data = &compat_log,
979 .maxlen = sizeof (int),
980 .mode = 0644,
981 .proc_handler = proc_dointvec,
982 },
983 #endif
984 #ifdef CONFIG_RT_MUTEXES
985 {
986 .procname = "max_lock_depth",
987 .data = &max_lock_depth,
988 .maxlen = sizeof(int),
989 .mode = 0644,
990 .proc_handler = proc_dointvec,
991 },
992 #endif
993 {
994 .procname = "poweroff_cmd",
995 .data = &poweroff_cmd,
996 .maxlen = POWEROFF_CMD_PATH_LEN,
997 .mode = 0644,
998 .proc_handler = proc_dostring,
999 },
1000 #ifdef CONFIG_KEYS
1001 {
1002 .procname = "keys",
1003 .mode = 0555,
1004 .child = key_sysctls,
1005 },
1006 #endif
1007 #ifdef CONFIG_RCU_TORTURE_TEST
1008 {
1009 .procname = "rcutorture_runnable",
1010 .data = &rcutorture_runnable,
1011 .maxlen = sizeof(int),
1012 .mode = 0644,
1013 .proc_handler = proc_dointvec,
1014 },
1015 #endif
1016 #ifdef CONFIG_PERF_EVENTS
1017 /*
1018 * User-space scripts rely on the existence of this file
1019 * as a feature check for perf_events being enabled.
1020 *
1021 * So it's an ABI, do not remove!
1022 */
1023 {
1024 .procname = "perf_event_paranoid",
1025 .data = &sysctl_perf_event_paranoid,
1026 .maxlen = sizeof(sysctl_perf_event_paranoid),
1027 .mode = 0644,
1028 .proc_handler = proc_dointvec,
1029 },
1030 {
1031 .procname = "perf_event_mlock_kb",
1032 .data = &sysctl_perf_event_mlock,
1033 .maxlen = sizeof(sysctl_perf_event_mlock),
1034 .mode = 0644,
1035 .proc_handler = proc_dointvec,
1036 },
1037 {
1038 .procname = "perf_event_max_sample_rate",
1039 .data = &sysctl_perf_event_sample_rate,
1040 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1041 .mode = 0644,
1042 .proc_handler = perf_proc_update_handler,
1043 },
1044 #endif
1045 #ifdef CONFIG_KMEMCHECK
1046 {
1047 .procname = "kmemcheck",
1048 .data = &kmemcheck_enabled,
1049 .maxlen = sizeof(int),
1050 .mode = 0644,
1051 .proc_handler = proc_dointvec,
1052 },
1053 #endif
1054 #ifdef CONFIG_BLOCK
1055 {
1056 .procname = "blk_iopoll",
1057 .data = &blk_iopoll_enabled,
1058 .maxlen = sizeof(int),
1059 .mode = 0644,
1060 .proc_handler = proc_dointvec,
1061 },
1062 #endif
1063 { }
1064 };
1065
1066 static struct ctl_table vm_table[] = {
1067 {
1068 .procname = "overcommit_memory",
1069 .data = &sysctl_overcommit_memory,
1070 .maxlen = sizeof(sysctl_overcommit_memory),
1071 .mode = 0644,
1072 .proc_handler = proc_dointvec_minmax,
1073 .extra1 = &zero,
1074 .extra2 = &two,
1075 },
1076 {
1077 .procname = "panic_on_oom",
1078 .data = &sysctl_panic_on_oom,
1079 .maxlen = sizeof(sysctl_panic_on_oom),
1080 .mode = 0644,
1081 .proc_handler = proc_dointvec_minmax,
1082 .extra1 = &zero,
1083 .extra2 = &two,
1084 },
1085 {
1086 .procname = "oom_kill_allocating_task",
1087 .data = &sysctl_oom_kill_allocating_task,
1088 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec,
1091 },
1092 {
1093 .procname = "oom_dump_tasks",
1094 .data = &sysctl_oom_dump_tasks,
1095 .maxlen = sizeof(sysctl_oom_dump_tasks),
1096 .mode = 0644,
1097 .proc_handler = proc_dointvec,
1098 },
1099 {
1100 .procname = "overcommit_ratio",
1101 .data = &sysctl_overcommit_ratio,
1102 .maxlen = sizeof(sysctl_overcommit_ratio),
1103 .mode = 0644,
1104 .proc_handler = proc_dointvec,
1105 },
1106 {
1107 .procname = "page-cluster",
1108 .data = &page_cluster,
1109 .maxlen = sizeof(int),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec_minmax,
1112 .extra1 = &zero,
1113 },
1114 {
1115 .procname = "dirty_background_ratio",
1116 .data = &dirty_background_ratio,
1117 .maxlen = sizeof(dirty_background_ratio),
1118 .mode = 0644,
1119 .proc_handler = dirty_background_ratio_handler,
1120 .extra1 = &zero,
1121 .extra2 = &one_hundred,
1122 },
1123 {
1124 .procname = "dirty_background_bytes",
1125 .data = &dirty_background_bytes,
1126 .maxlen = sizeof(dirty_background_bytes),
1127 .mode = 0644,
1128 .proc_handler = dirty_background_bytes_handler,
1129 .extra1 = &one_ul,
1130 },
1131 {
1132 .procname = "dirty_ratio",
1133 .data = &vm_dirty_ratio,
1134 .maxlen = sizeof(vm_dirty_ratio),
1135 .mode = 0644,
1136 .proc_handler = dirty_ratio_handler,
1137 .extra1 = &zero,
1138 .extra2 = &one_hundred,
1139 },
1140 {
1141 .procname = "dirty_bytes",
1142 .data = &vm_dirty_bytes,
1143 .maxlen = sizeof(vm_dirty_bytes),
1144 .mode = 0644,
1145 .proc_handler = dirty_bytes_handler,
1146 .extra1 = &dirty_bytes_min,
1147 },
1148 {
1149 .procname = "dirty_writeback_centisecs",
1150 .data = &dirty_writeback_interval,
1151 .maxlen = sizeof(dirty_writeback_interval),
1152 .mode = 0644,
1153 .proc_handler = dirty_writeback_centisecs_handler,
1154 },
1155 {
1156 .procname = "dirty_expire_centisecs",
1157 .data = &dirty_expire_interval,
1158 .maxlen = sizeof(dirty_expire_interval),
1159 .mode = 0644,
1160 .proc_handler = proc_dointvec_minmax,
1161 .extra1 = &zero,
1162 },
1163 {
1164 .procname = "nr_pdflush_threads",
1165 .mode = 0444 /* read-only */,
1166 .proc_handler = pdflush_proc_obsolete,
1167 },
1168 {
1169 .procname = "swappiness",
1170 .data = &vm_swappiness,
1171 .maxlen = sizeof(vm_swappiness),
1172 .mode = 0644,
1173 .proc_handler = proc_dointvec_minmax,
1174 .extra1 = &zero,
1175 .extra2 = &one_hundred,
1176 },
1177 #ifdef CONFIG_HUGETLB_PAGE
1178 {
1179 .procname = "nr_hugepages",
1180 .data = NULL,
1181 .maxlen = sizeof(unsigned long),
1182 .mode = 0644,
1183 .proc_handler = hugetlb_sysctl_handler,
1184 .extra1 = (void *)&hugetlb_zero,
1185 .extra2 = (void *)&hugetlb_infinity,
1186 },
1187 #ifdef CONFIG_NUMA
1188 {
1189 .procname = "nr_hugepages_mempolicy",
1190 .data = NULL,
1191 .maxlen = sizeof(unsigned long),
1192 .mode = 0644,
1193 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1194 .extra1 = (void *)&hugetlb_zero,
1195 .extra2 = (void *)&hugetlb_infinity,
1196 },
1197 #endif
1198 {
1199 .procname = "hugetlb_shm_group",
1200 .data = &sysctl_hugetlb_shm_group,
1201 .maxlen = sizeof(gid_t),
1202 .mode = 0644,
1203 .proc_handler = proc_dointvec,
1204 },
1205 {
1206 .procname = "hugepages_treat_as_movable",
1207 .data = &hugepages_treat_as_movable,
1208 .maxlen = sizeof(int),
1209 .mode = 0644,
1210 .proc_handler = hugetlb_treat_movable_handler,
1211 },
1212 {
1213 .procname = "nr_overcommit_hugepages",
1214 .data = NULL,
1215 .maxlen = sizeof(unsigned long),
1216 .mode = 0644,
1217 .proc_handler = hugetlb_overcommit_handler,
1218 .extra1 = (void *)&hugetlb_zero,
1219 .extra2 = (void *)&hugetlb_infinity,
1220 },
1221 #endif
1222 {
1223 .procname = "lowmem_reserve_ratio",
1224 .data = &sysctl_lowmem_reserve_ratio,
1225 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1226 .mode = 0644,
1227 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1228 },
1229 {
1230 .procname = "drop_caches",
1231 .data = &sysctl_drop_caches,
1232 .maxlen = sizeof(int),
1233 .mode = 0644,
1234 .proc_handler = drop_caches_sysctl_handler,
1235 .extra1 = &one,
1236 .extra2 = &three,
1237 },
1238 #ifdef CONFIG_COMPACTION
1239 {
1240 .procname = "compact_memory",
1241 .data = &sysctl_compact_memory,
1242 .maxlen = sizeof(int),
1243 .mode = 0200,
1244 .proc_handler = sysctl_compaction_handler,
1245 },
1246 {
1247 .procname = "extfrag_threshold",
1248 .data = &sysctl_extfrag_threshold,
1249 .maxlen = sizeof(int),
1250 .mode = 0644,
1251 .proc_handler = sysctl_extfrag_handler,
1252 .extra1 = &min_extfrag_threshold,
1253 .extra2 = &max_extfrag_threshold,
1254 },
1255
1256 #endif /* CONFIG_COMPACTION */
1257 {
1258 .procname = "min_free_kbytes",
1259 .data = &min_free_kbytes,
1260 .maxlen = sizeof(min_free_kbytes),
1261 .mode = 0644,
1262 .proc_handler = min_free_kbytes_sysctl_handler,
1263 .extra1 = &zero,
1264 },
1265 {
1266 .procname = "percpu_pagelist_fraction",
1267 .data = &percpu_pagelist_fraction,
1268 .maxlen = sizeof(percpu_pagelist_fraction),
1269 .mode = 0644,
1270 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1271 .extra1 = &min_percpu_pagelist_fract,
1272 },
1273 #ifdef CONFIG_MMU
1274 {
1275 .procname = "max_map_count",
1276 .data = &sysctl_max_map_count,
1277 .maxlen = sizeof(sysctl_max_map_count),
1278 .mode = 0644,
1279 .proc_handler = proc_dointvec_minmax,
1280 .extra1 = &zero,
1281 },
1282 #else
1283 {
1284 .procname = "nr_trim_pages",
1285 .data = &sysctl_nr_trim_pages,
1286 .maxlen = sizeof(sysctl_nr_trim_pages),
1287 .mode = 0644,
1288 .proc_handler = proc_dointvec_minmax,
1289 .extra1 = &zero,
1290 },
1291 #endif
1292 {
1293 .procname = "laptop_mode",
1294 .data = &laptop_mode,
1295 .maxlen = sizeof(laptop_mode),
1296 .mode = 0644,
1297 .proc_handler = proc_dointvec_jiffies,
1298 },
1299 {
1300 .procname = "block_dump",
1301 .data = &block_dump,
1302 .maxlen = sizeof(block_dump),
1303 .mode = 0644,
1304 .proc_handler = proc_dointvec,
1305 .extra1 = &zero,
1306 },
1307 {
1308 .procname = "vfs_cache_pressure",
1309 .data = &sysctl_vfs_cache_pressure,
1310 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1311 .mode = 0644,
1312 .proc_handler = proc_dointvec,
1313 .extra1 = &zero,
1314 },
1315 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1316 {
1317 .procname = "legacy_va_layout",
1318 .data = &sysctl_legacy_va_layout,
1319 .maxlen = sizeof(sysctl_legacy_va_layout),
1320 .mode = 0644,
1321 .proc_handler = proc_dointvec,
1322 .extra1 = &zero,
1323 },
1324 #endif
1325 #ifdef CONFIG_NUMA
1326 {
1327 .procname = "zone_reclaim_mode",
1328 .data = &zone_reclaim_mode,
1329 .maxlen = sizeof(zone_reclaim_mode),
1330 .mode = 0644,
1331 .proc_handler = proc_dointvec,
1332 .extra1 = &zero,
1333 },
1334 {
1335 .procname = "min_unmapped_ratio",
1336 .data = &sysctl_min_unmapped_ratio,
1337 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1338 .mode = 0644,
1339 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1340 .extra1 = &zero,
1341 .extra2 = &one_hundred,
1342 },
1343 {
1344 .procname = "min_slab_ratio",
1345 .data = &sysctl_min_slab_ratio,
1346 .maxlen = sizeof(sysctl_min_slab_ratio),
1347 .mode = 0644,
1348 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1349 .extra1 = &zero,
1350 .extra2 = &one_hundred,
1351 },
1352 #endif
1353 #ifdef CONFIG_SMP
1354 {
1355 .procname = "stat_interval",
1356 .data = &sysctl_stat_interval,
1357 .maxlen = sizeof(sysctl_stat_interval),
1358 .mode = 0644,
1359 .proc_handler = proc_dointvec_jiffies,
1360 },
1361 #endif
1362 #ifdef CONFIG_MMU
1363 {
1364 .procname = "mmap_min_addr",
1365 .data = &dac_mmap_min_addr,
1366 .maxlen = sizeof(unsigned long),
1367 .mode = 0644,
1368 .proc_handler = mmap_min_addr_handler,
1369 },
1370 #endif
1371 #ifdef CONFIG_NUMA
1372 {
1373 .procname = "numa_zonelist_order",
1374 .data = &numa_zonelist_order,
1375 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1376 .mode = 0644,
1377 .proc_handler = numa_zonelist_order_handler,
1378 },
1379 #endif
1380 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1381 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1382 {
1383 .procname = "vdso_enabled",
1384 .data = &vdso_enabled,
1385 .maxlen = sizeof(vdso_enabled),
1386 .mode = 0644,
1387 .proc_handler = proc_dointvec,
1388 .extra1 = &zero,
1389 },
1390 #endif
1391 #ifdef CONFIG_HIGHMEM
1392 {
1393 .procname = "highmem_is_dirtyable",
1394 .data = &vm_highmem_is_dirtyable,
1395 .maxlen = sizeof(vm_highmem_is_dirtyable),
1396 .mode = 0644,
1397 .proc_handler = proc_dointvec_minmax,
1398 .extra1 = &zero,
1399 .extra2 = &one,
1400 },
1401 #endif
1402 {
1403 .procname = "scan_unevictable_pages",
1404 .data = &scan_unevictable_pages,
1405 .maxlen = sizeof(scan_unevictable_pages),
1406 .mode = 0644,
1407 .proc_handler = scan_unevictable_handler,
1408 },
1409 #ifdef CONFIG_MEMORY_FAILURE
1410 {
1411 .procname = "memory_failure_early_kill",
1412 .data = &sysctl_memory_failure_early_kill,
1413 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1414 .mode = 0644,
1415 .proc_handler = proc_dointvec_minmax,
1416 .extra1 = &zero,
1417 .extra2 = &one,
1418 },
1419 {
1420 .procname = "memory_failure_recovery",
1421 .data = &sysctl_memory_failure_recovery,
1422 .maxlen = sizeof(sysctl_memory_failure_recovery),
1423 .mode = 0644,
1424 .proc_handler = proc_dointvec_minmax,
1425 .extra1 = &zero,
1426 .extra2 = &one,
1427 },
1428 #endif
1429 { }
1430 };
1431
1432 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1433 static struct ctl_table binfmt_misc_table[] = {
1434 { }
1435 };
1436 #endif
1437
1438 static struct ctl_table fs_table[] = {
1439 {
1440 .procname = "inode-nr",
1441 .data = &inodes_stat,
1442 .maxlen = 2*sizeof(int),
1443 .mode = 0444,
1444 .proc_handler = proc_nr_inodes,
1445 },
1446 {
1447 .procname = "inode-state",
1448 .data = &inodes_stat,
1449 .maxlen = 7*sizeof(int),
1450 .mode = 0444,
1451 .proc_handler = proc_nr_inodes,
1452 },
1453 {
1454 .procname = "file-nr",
1455 .data = &files_stat,
1456 .maxlen = sizeof(files_stat),
1457 .mode = 0444,
1458 .proc_handler = proc_nr_files,
1459 },
1460 {
1461 .procname = "file-max",
1462 .data = &files_stat.max_files,
1463 .maxlen = sizeof(files_stat.max_files),
1464 .mode = 0644,
1465 .proc_handler = proc_doulongvec_minmax,
1466 },
1467 {
1468 .procname = "nr_open",
1469 .data = &sysctl_nr_open,
1470 .maxlen = sizeof(int),
1471 .mode = 0644,
1472 .proc_handler = proc_dointvec_minmax,
1473 .extra1 = &sysctl_nr_open_min,
1474 .extra2 = &sysctl_nr_open_max,
1475 },
1476 {
1477 .procname = "dentry-state",
1478 .data = &dentry_stat,
1479 .maxlen = 6*sizeof(int),
1480 .mode = 0444,
1481 .proc_handler = proc_nr_dentry,
1482 },
1483 {
1484 .procname = "overflowuid",
1485 .data = &fs_overflowuid,
1486 .maxlen = sizeof(int),
1487 .mode = 0644,
1488 .proc_handler = proc_dointvec_minmax,
1489 .extra1 = &minolduid,
1490 .extra2 = &maxolduid,
1491 },
1492 {
1493 .procname = "overflowgid",
1494 .data = &fs_overflowgid,
1495 .maxlen = sizeof(int),
1496 .mode = 0644,
1497 .proc_handler = proc_dointvec_minmax,
1498 .extra1 = &minolduid,
1499 .extra2 = &maxolduid,
1500 },
1501 #ifdef CONFIG_FILE_LOCKING
1502 {
1503 .procname = "leases-enable",
1504 .data = &leases_enable,
1505 .maxlen = sizeof(int),
1506 .mode = 0644,
1507 .proc_handler = proc_dointvec,
1508 },
1509 #endif
1510 #ifdef CONFIG_DNOTIFY
1511 {
1512 .procname = "dir-notify-enable",
1513 .data = &dir_notify_enable,
1514 .maxlen = sizeof(int),
1515 .mode = 0644,
1516 .proc_handler = proc_dointvec,
1517 },
1518 #endif
1519 #ifdef CONFIG_MMU
1520 #ifdef CONFIG_FILE_LOCKING
1521 {
1522 .procname = "lease-break-time",
1523 .data = &lease_break_time,
1524 .maxlen = sizeof(int),
1525 .mode = 0644,
1526 .proc_handler = proc_dointvec,
1527 },
1528 #endif
1529 #ifdef CONFIG_AIO
1530 {
1531 .procname = "aio-nr",
1532 .data = &aio_nr,
1533 .maxlen = sizeof(aio_nr),
1534 .mode = 0444,
1535 .proc_handler = proc_doulongvec_minmax,
1536 },
1537 {
1538 .procname = "aio-max-nr",
1539 .data = &aio_max_nr,
1540 .maxlen = sizeof(aio_max_nr),
1541 .mode = 0644,
1542 .proc_handler = proc_doulongvec_minmax,
1543 },
1544 #endif /* CONFIG_AIO */
1545 #ifdef CONFIG_INOTIFY_USER
1546 {
1547 .procname = "inotify",
1548 .mode = 0555,
1549 .child = inotify_table,
1550 },
1551 #endif
1552 #ifdef CONFIG_EPOLL
1553 {
1554 .procname = "epoll",
1555 .mode = 0555,
1556 .child = epoll_table,
1557 },
1558 #endif
1559 #endif
1560 {
1561 .procname = "protected_symlinks",
1562 .data = &sysctl_protected_symlinks,
1563 .maxlen = sizeof(int),
1564 .mode = 0600,
1565 .proc_handler = proc_dointvec_minmax,
1566 .extra1 = &zero,
1567 .extra2 = &one,
1568 },
1569 {
1570 .procname = "protected_hardlinks",
1571 .data = &sysctl_protected_hardlinks,
1572 .maxlen = sizeof(int),
1573 .mode = 0600,
1574 .proc_handler = proc_dointvec_minmax,
1575 .extra1 = &zero,
1576 .extra2 = &one,
1577 },
1578 {
1579 .procname = "suid_dumpable",
1580 .data = &suid_dumpable,
1581 .maxlen = sizeof(int),
1582 .mode = 0644,
1583 .proc_handler = proc_dointvec_minmax_coredump,
1584 .extra1 = &zero,
1585 .extra2 = &two,
1586 },
1587 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1588 {
1589 .procname = "binfmt_misc",
1590 .mode = 0555,
1591 .child = binfmt_misc_table,
1592 },
1593 #endif
1594 {
1595 .procname = "pipe-max-size",
1596 .data = &pipe_max_size,
1597 .maxlen = sizeof(int),
1598 .mode = 0644,
1599 .proc_handler = &pipe_proc_fn,
1600 .extra1 = &pipe_min_size,
1601 },
1602 { }
1603 };
1604
1605 static struct ctl_table debug_table[] = {
1606 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1607 {
1608 .procname = "exception-trace",
1609 .data = &show_unhandled_signals,
1610 .maxlen = sizeof(int),
1611 .mode = 0644,
1612 .proc_handler = proc_dointvec
1613 },
1614 #endif
1615 #if defined(CONFIG_OPTPROBES)
1616 {
1617 .procname = "kprobes-optimization",
1618 .data = &sysctl_kprobes_optimization,
1619 .maxlen = sizeof(int),
1620 .mode = 0644,
1621 .proc_handler = proc_kprobes_optimization_handler,
1622 .extra1 = &zero,
1623 .extra2 = &one,
1624 },
1625 #endif
1626 { }
1627 };
1628
1629 static struct ctl_table dev_table[] = {
1630 { }
1631 };
1632
1633 int __init sysctl_init(void)
1634 {
1635 struct ctl_table_header *hdr;
1636
1637 hdr = register_sysctl_table(sysctl_base_table);
1638 kmemleak_not_leak(hdr);
1639 return 0;
1640 }
1641
1642 #endif /* CONFIG_SYSCTL */
1643
1644 /*
1645 * /proc/sys support
1646 */
1647
1648 #ifdef CONFIG_PROC_SYSCTL
1649
1650 static int _proc_do_string(void* data, int maxlen, int write,
1651 void __user *buffer,
1652 size_t *lenp, loff_t *ppos)
1653 {
1654 size_t len;
1655 char __user *p;
1656 char c;
1657
1658 if (!data || !maxlen || !*lenp) {
1659 *lenp = 0;
1660 return 0;
1661 }
1662
1663 if (write) {
1664 len = 0;
1665 p = buffer;
1666 while (len < *lenp) {
1667 if (get_user(c, p++))
1668 return -EFAULT;
1669 if (c == 0 || c == '\n')
1670 break;
1671 len++;
1672 }
1673 if (len >= maxlen)
1674 len = maxlen-1;
1675 if(copy_from_user(data, buffer, len))
1676 return -EFAULT;
1677 ((char *) data)[len] = 0;
1678 *ppos += *lenp;
1679 } else {
1680 len = strlen(data);
1681 if (len > maxlen)
1682 len = maxlen;
1683
1684 if (*ppos > len) {
1685 *lenp = 0;
1686 return 0;
1687 }
1688
1689 data += *ppos;
1690 len -= *ppos;
1691
1692 if (len > *lenp)
1693 len = *lenp;
1694 if (len)
1695 if(copy_to_user(buffer, data, len))
1696 return -EFAULT;
1697 if (len < *lenp) {
1698 if(put_user('\n', ((char __user *) buffer) + len))
1699 return -EFAULT;
1700 len++;
1701 }
1702 *lenp = len;
1703 *ppos += len;
1704 }
1705 return 0;
1706 }
1707
1708 /**
1709 * proc_dostring - read a string sysctl
1710 * @table: the sysctl table
1711 * @write: %TRUE if this is a write to the sysctl file
1712 * @buffer: the user buffer
1713 * @lenp: the size of the user buffer
1714 * @ppos: file position
1715 *
1716 * Reads/writes a string from/to the user buffer. If the kernel
1717 * buffer provided is not large enough to hold the string, the
1718 * string is truncated. The copied string is %NULL-terminated.
1719 * If the string is being read by the user process, it is copied
1720 * and a newline '\n' is added. It is truncated if the buffer is
1721 * not large enough.
1722 *
1723 * Returns 0 on success.
1724 */
1725 int proc_dostring(struct ctl_table *table, int write,
1726 void __user *buffer, size_t *lenp, loff_t *ppos)
1727 {
1728 return _proc_do_string(table->data, table->maxlen, write,
1729 buffer, lenp, ppos);
1730 }
1731
1732 static size_t proc_skip_spaces(char **buf)
1733 {
1734 size_t ret;
1735 char *tmp = skip_spaces(*buf);
1736 ret = tmp - *buf;
1737 *buf = tmp;
1738 return ret;
1739 }
1740
1741 static void proc_skip_char(char **buf, size_t *size, const char v)
1742 {
1743 while (*size) {
1744 if (**buf != v)
1745 break;
1746 (*size)--;
1747 (*buf)++;
1748 }
1749 }
1750
1751 #define TMPBUFLEN 22
1752 /**
1753 * proc_get_long - reads an ASCII formatted integer from a user buffer
1754 *
1755 * @buf: a kernel buffer
1756 * @size: size of the kernel buffer
1757 * @val: this is where the number will be stored
1758 * @neg: set to %TRUE if number is negative
1759 * @perm_tr: a vector which contains the allowed trailers
1760 * @perm_tr_len: size of the perm_tr vector
1761 * @tr: pointer to store the trailer character
1762 *
1763 * In case of success %0 is returned and @buf and @size are updated with
1764 * the amount of bytes read. If @tr is non-NULL and a trailing
1765 * character exists (size is non-zero after returning from this
1766 * function), @tr is updated with the trailing character.
1767 */
1768 static int proc_get_long(char **buf, size_t *size,
1769 unsigned long *val, bool *neg,
1770 const char *perm_tr, unsigned perm_tr_len, char *tr)
1771 {
1772 int len;
1773 char *p, tmp[TMPBUFLEN];
1774
1775 if (!*size)
1776 return -EINVAL;
1777
1778 len = *size;
1779 if (len > TMPBUFLEN - 1)
1780 len = TMPBUFLEN - 1;
1781
1782 memcpy(tmp, *buf, len);
1783
1784 tmp[len] = 0;
1785 p = tmp;
1786 if (*p == '-' && *size > 1) {
1787 *neg = true;
1788 p++;
1789 } else
1790 *neg = false;
1791 if (!isdigit(*p))
1792 return -EINVAL;
1793
1794 *val = simple_strtoul(p, &p, 0);
1795
1796 len = p - tmp;
1797
1798 /* We don't know if the next char is whitespace thus we may accept
1799 * invalid integers (e.g. 1234...a) or two integers instead of one
1800 * (e.g. 123...1). So lets not allow such large numbers. */
1801 if (len == TMPBUFLEN - 1)
1802 return -EINVAL;
1803
1804 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1805 return -EINVAL;
1806
1807 if (tr && (len < *size))
1808 *tr = *p;
1809
1810 *buf += len;
1811 *size -= len;
1812
1813 return 0;
1814 }
1815
1816 /**
1817 * proc_put_long - converts an integer to a decimal ASCII formatted string
1818 *
1819 * @buf: the user buffer
1820 * @size: the size of the user buffer
1821 * @val: the integer to be converted
1822 * @neg: sign of the number, %TRUE for negative
1823 *
1824 * In case of success %0 is returned and @buf and @size are updated with
1825 * the amount of bytes written.
1826 */
1827 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1828 bool neg)
1829 {
1830 int len;
1831 char tmp[TMPBUFLEN], *p = tmp;
1832
1833 sprintf(p, "%s%lu", neg ? "-" : "", val);
1834 len = strlen(tmp);
1835 if (len > *size)
1836 len = *size;
1837 if (copy_to_user(*buf, tmp, len))
1838 return -EFAULT;
1839 *size -= len;
1840 *buf += len;
1841 return 0;
1842 }
1843 #undef TMPBUFLEN
1844
1845 static int proc_put_char(void __user **buf, size_t *size, char c)
1846 {
1847 if (*size) {
1848 char __user **buffer = (char __user **)buf;
1849 if (put_user(c, *buffer))
1850 return -EFAULT;
1851 (*size)--, (*buffer)++;
1852 *buf = *buffer;
1853 }
1854 return 0;
1855 }
1856
1857 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1858 int *valp,
1859 int write, void *data)
1860 {
1861 if (write) {
1862 *valp = *negp ? -*lvalp : *lvalp;
1863 } else {
1864 int val = *valp;
1865 if (val < 0) {
1866 *negp = true;
1867 *lvalp = (unsigned long)-val;
1868 } else {
1869 *negp = false;
1870 *lvalp = (unsigned long)val;
1871 }
1872 }
1873 return 0;
1874 }
1875
1876 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1877
1878 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1879 int write, void __user *buffer,
1880 size_t *lenp, loff_t *ppos,
1881 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1882 int write, void *data),
1883 void *data)
1884 {
1885 int *i, vleft, first = 1, err = 0;
1886 unsigned long page = 0;
1887 size_t left;
1888 char *kbuf;
1889
1890 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1891 *lenp = 0;
1892 return 0;
1893 }
1894
1895 i = (int *) tbl_data;
1896 vleft = table->maxlen / sizeof(*i);
1897 left = *lenp;
1898
1899 if (!conv)
1900 conv = do_proc_dointvec_conv;
1901
1902 if (write) {
1903 if (left > PAGE_SIZE - 1)
1904 left = PAGE_SIZE - 1;
1905 page = __get_free_page(GFP_TEMPORARY);
1906 kbuf = (char *) page;
1907 if (!kbuf)
1908 return -ENOMEM;
1909 if (copy_from_user(kbuf, buffer, left)) {
1910 err = -EFAULT;
1911 goto free;
1912 }
1913 kbuf[left] = 0;
1914 }
1915
1916 for (; left && vleft--; i++, first=0) {
1917 unsigned long lval;
1918 bool neg;
1919
1920 if (write) {
1921 left -= proc_skip_spaces(&kbuf);
1922
1923 if (!left)
1924 break;
1925 err = proc_get_long(&kbuf, &left, &lval, &neg,
1926 proc_wspace_sep,
1927 sizeof(proc_wspace_sep), NULL);
1928 if (err)
1929 break;
1930 if (conv(&neg, &lval, i, 1, data)) {
1931 err = -EINVAL;
1932 break;
1933 }
1934 } else {
1935 if (conv(&neg, &lval, i, 0, data)) {
1936 err = -EINVAL;
1937 break;
1938 }
1939 if (!first)
1940 err = proc_put_char(&buffer, &left, '\t');
1941 if (err)
1942 break;
1943 err = proc_put_long(&buffer, &left, lval, neg);
1944 if (err)
1945 break;
1946 }
1947 }
1948
1949 if (!write && !first && left && !err)
1950 err = proc_put_char(&buffer, &left, '\n');
1951 if (write && !err && left)
1952 left -= proc_skip_spaces(&kbuf);
1953 free:
1954 if (write) {
1955 free_page(page);
1956 if (first)
1957 return err ? : -EINVAL;
1958 }
1959 *lenp -= left;
1960 *ppos += *lenp;
1961 return err;
1962 }
1963
1964 static int do_proc_dointvec(struct ctl_table *table, int write,
1965 void __user *buffer, size_t *lenp, loff_t *ppos,
1966 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1967 int write, void *data),
1968 void *data)
1969 {
1970 return __do_proc_dointvec(table->data, table, write,
1971 buffer, lenp, ppos, conv, data);
1972 }
1973
1974 /**
1975 * proc_dointvec - read a vector of integers
1976 * @table: the sysctl table
1977 * @write: %TRUE if this is a write to the sysctl file
1978 * @buffer: the user buffer
1979 * @lenp: the size of the user buffer
1980 * @ppos: file position
1981 *
1982 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1983 * values from/to the user buffer, treated as an ASCII string.
1984 *
1985 * Returns 0 on success.
1986 */
1987 int proc_dointvec(struct ctl_table *table, int write,
1988 void __user *buffer, size_t *lenp, loff_t *ppos)
1989 {
1990 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1991 NULL,NULL);
1992 }
1993
1994 /*
1995 * Taint values can only be increased
1996 * This means we can safely use a temporary.
1997 */
1998 static int proc_taint(struct ctl_table *table, int write,
1999 void __user *buffer, size_t *lenp, loff_t *ppos)
2000 {
2001 struct ctl_table t;
2002 unsigned long tmptaint = get_taint();
2003 int err;
2004
2005 if (write && !capable(CAP_SYS_ADMIN))
2006 return -EPERM;
2007
2008 t = *table;
2009 t.data = &tmptaint;
2010 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2011 if (err < 0)
2012 return err;
2013
2014 if (write) {
2015 /*
2016 * Poor man's atomic or. Not worth adding a primitive
2017 * to everyone's atomic.h for this
2018 */
2019 int i;
2020 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2021 if ((tmptaint >> i) & 1)
2022 add_taint(i);
2023 }
2024 }
2025
2026 return err;
2027 }
2028
2029 #ifdef CONFIG_PRINTK
2030 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2031 void __user *buffer, size_t *lenp, loff_t *ppos)
2032 {
2033 if (write && !capable(CAP_SYS_ADMIN))
2034 return -EPERM;
2035
2036 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2037 }
2038 #endif
2039
2040 struct do_proc_dointvec_minmax_conv_param {
2041 int *min;
2042 int *max;
2043 };
2044
2045 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2046 int *valp,
2047 int write, void *data)
2048 {
2049 struct do_proc_dointvec_minmax_conv_param *param = data;
2050 if (write) {
2051 int val = *negp ? -*lvalp : *lvalp;
2052 if ((param->min && *param->min > val) ||
2053 (param->max && *param->max < val))
2054 return -EINVAL;
2055 *valp = val;
2056 } else {
2057 int val = *valp;
2058 if (val < 0) {
2059 *negp = true;
2060 *lvalp = (unsigned long)-val;
2061 } else {
2062 *negp = false;
2063 *lvalp = (unsigned long)val;
2064 }
2065 }
2066 return 0;
2067 }
2068
2069 /**
2070 * proc_dointvec_minmax - read a vector of integers with min/max values
2071 * @table: the sysctl table
2072 * @write: %TRUE if this is a write to the sysctl file
2073 * @buffer: the user buffer
2074 * @lenp: the size of the user buffer
2075 * @ppos: file position
2076 *
2077 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2078 * values from/to the user buffer, treated as an ASCII string.
2079 *
2080 * This routine will ensure the values are within the range specified by
2081 * table->extra1 (min) and table->extra2 (max).
2082 *
2083 * Returns 0 on success.
2084 */
2085 int proc_dointvec_minmax(struct ctl_table *table, int write,
2086 void __user *buffer, size_t *lenp, loff_t *ppos)
2087 {
2088 struct do_proc_dointvec_minmax_conv_param param = {
2089 .min = (int *) table->extra1,
2090 .max = (int *) table->extra2,
2091 };
2092 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2093 do_proc_dointvec_minmax_conv, &param);
2094 }
2095
2096 static void validate_coredump_safety(void)
2097 {
2098 #ifdef CONFIG_COREDUMP
2099 if (suid_dumpable == SUID_DUMPABLE_SAFE &&
2100 core_pattern[0] != '/' && core_pattern[0] != '|') {
2101 printk(KERN_WARNING "Unsafe core_pattern used with "\
2102 "suid_dumpable=2. Pipe handler or fully qualified "\
2103 "core dump path required.\n");
2104 }
2105 #endif
2106 }
2107
2108 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2109 void __user *buffer, size_t *lenp, loff_t *ppos)
2110 {
2111 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2112 if (!error)
2113 validate_coredump_safety();
2114 return error;
2115 }
2116
2117 #ifdef CONFIG_COREDUMP
2118 static int proc_dostring_coredump(struct ctl_table *table, int write,
2119 void __user *buffer, size_t *lenp, loff_t *ppos)
2120 {
2121 int error = proc_dostring(table, write, buffer, lenp, ppos);
2122 if (!error)
2123 validate_coredump_safety();
2124 return error;
2125 }
2126 #endif
2127
2128 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2129 void __user *buffer,
2130 size_t *lenp, loff_t *ppos,
2131 unsigned long convmul,
2132 unsigned long convdiv)
2133 {
2134 unsigned long *i, *min, *max;
2135 int vleft, first = 1, err = 0;
2136 unsigned long page = 0;
2137 size_t left;
2138 char *kbuf;
2139
2140 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2141 *lenp = 0;
2142 return 0;
2143 }
2144
2145 i = (unsigned long *) data;
2146 min = (unsigned long *) table->extra1;
2147 max = (unsigned long *) table->extra2;
2148 vleft = table->maxlen / sizeof(unsigned long);
2149 left = *lenp;
2150
2151 if (write) {
2152 if (left > PAGE_SIZE - 1)
2153 left = PAGE_SIZE - 1;
2154 page = __get_free_page(GFP_TEMPORARY);
2155 kbuf = (char *) page;
2156 if (!kbuf)
2157 return -ENOMEM;
2158 if (copy_from_user(kbuf, buffer, left)) {
2159 err = -EFAULT;
2160 goto free;
2161 }
2162 kbuf[left] = 0;
2163 }
2164
2165 for (; left && vleft--; i++, first = 0) {
2166 unsigned long val;
2167
2168 if (write) {
2169 bool neg;
2170
2171 left -= proc_skip_spaces(&kbuf);
2172
2173 err = proc_get_long(&kbuf, &left, &val, &neg,
2174 proc_wspace_sep,
2175 sizeof(proc_wspace_sep), NULL);
2176 if (err)
2177 break;
2178 if (neg)
2179 continue;
2180 if ((min && val < *min) || (max && val > *max))
2181 continue;
2182 *i = val;
2183 } else {
2184 val = convdiv * (*i) / convmul;
2185 if (!first)
2186 err = proc_put_char(&buffer, &left, '\t');
2187 err = proc_put_long(&buffer, &left, val, false);
2188 if (err)
2189 break;
2190 }
2191 }
2192
2193 if (!write && !first && left && !err)
2194 err = proc_put_char(&buffer, &left, '\n');
2195 if (write && !err)
2196 left -= proc_skip_spaces(&kbuf);
2197 free:
2198 if (write) {
2199 free_page(page);
2200 if (first)
2201 return err ? : -EINVAL;
2202 }
2203 *lenp -= left;
2204 *ppos += *lenp;
2205 return err;
2206 }
2207
2208 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2209 void __user *buffer,
2210 size_t *lenp, loff_t *ppos,
2211 unsigned long convmul,
2212 unsigned long convdiv)
2213 {
2214 return __do_proc_doulongvec_minmax(table->data, table, write,
2215 buffer, lenp, ppos, convmul, convdiv);
2216 }
2217
2218 /**
2219 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2220 * @table: the sysctl table
2221 * @write: %TRUE if this is a write to the sysctl file
2222 * @buffer: the user buffer
2223 * @lenp: the size of the user buffer
2224 * @ppos: file position
2225 *
2226 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2227 * values from/to the user buffer, treated as an ASCII string.
2228 *
2229 * This routine will ensure the values are within the range specified by
2230 * table->extra1 (min) and table->extra2 (max).
2231 *
2232 * Returns 0 on success.
2233 */
2234 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2235 void __user *buffer, size_t *lenp, loff_t *ppos)
2236 {
2237 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2238 }
2239
2240 /**
2241 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2242 * @table: the sysctl table
2243 * @write: %TRUE if this is a write to the sysctl file
2244 * @buffer: the user buffer
2245 * @lenp: the size of the user buffer
2246 * @ppos: file position
2247 *
2248 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2249 * values from/to the user buffer, treated as an ASCII string. The values
2250 * are treated as milliseconds, and converted to jiffies when they are stored.
2251 *
2252 * This routine will ensure the values are within the range specified by
2253 * table->extra1 (min) and table->extra2 (max).
2254 *
2255 * Returns 0 on success.
2256 */
2257 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2258 void __user *buffer,
2259 size_t *lenp, loff_t *ppos)
2260 {
2261 return do_proc_doulongvec_minmax(table, write, buffer,
2262 lenp, ppos, HZ, 1000l);
2263 }
2264
2265
2266 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2267 int *valp,
2268 int write, void *data)
2269 {
2270 if (write) {
2271 if (*lvalp > LONG_MAX / HZ)
2272 return 1;
2273 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2274 } else {
2275 int val = *valp;
2276 unsigned long lval;
2277 if (val < 0) {
2278 *negp = true;
2279 lval = (unsigned long)-val;
2280 } else {
2281 *negp = false;
2282 lval = (unsigned long)val;
2283 }
2284 *lvalp = lval / HZ;
2285 }
2286 return 0;
2287 }
2288
2289 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2290 int *valp,
2291 int write, void *data)
2292 {
2293 if (write) {
2294 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2295 return 1;
2296 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2297 } else {
2298 int val = *valp;
2299 unsigned long lval;
2300 if (val < 0) {
2301 *negp = true;
2302 lval = (unsigned long)-val;
2303 } else {
2304 *negp = false;
2305 lval = (unsigned long)val;
2306 }
2307 *lvalp = jiffies_to_clock_t(lval);
2308 }
2309 return 0;
2310 }
2311
2312 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2313 int *valp,
2314 int write, void *data)
2315 {
2316 if (write) {
2317 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2318 } else {
2319 int val = *valp;
2320 unsigned long lval;
2321 if (val < 0) {
2322 *negp = true;
2323 lval = (unsigned long)-val;
2324 } else {
2325 *negp = false;
2326 lval = (unsigned long)val;
2327 }
2328 *lvalp = jiffies_to_msecs(lval);
2329 }
2330 return 0;
2331 }
2332
2333 /**
2334 * proc_dointvec_jiffies - read a vector of integers as seconds
2335 * @table: the sysctl table
2336 * @write: %TRUE if this is a write to the sysctl file
2337 * @buffer: the user buffer
2338 * @lenp: the size of the user buffer
2339 * @ppos: file position
2340 *
2341 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2342 * values from/to the user buffer, treated as an ASCII string.
2343 * The values read are assumed to be in seconds, and are converted into
2344 * jiffies.
2345 *
2346 * Returns 0 on success.
2347 */
2348 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2349 void __user *buffer, size_t *lenp, loff_t *ppos)
2350 {
2351 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2352 do_proc_dointvec_jiffies_conv,NULL);
2353 }
2354
2355 /**
2356 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2357 * @table: the sysctl table
2358 * @write: %TRUE if this is a write to the sysctl file
2359 * @buffer: the user buffer
2360 * @lenp: the size of the user buffer
2361 * @ppos: pointer to the file position
2362 *
2363 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2364 * values from/to the user buffer, treated as an ASCII string.
2365 * The values read are assumed to be in 1/USER_HZ seconds, and
2366 * are converted into jiffies.
2367 *
2368 * Returns 0 on success.
2369 */
2370 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2371 void __user *buffer, size_t *lenp, loff_t *ppos)
2372 {
2373 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2374 do_proc_dointvec_userhz_jiffies_conv,NULL);
2375 }
2376
2377 /**
2378 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2379 * @table: the sysctl table
2380 * @write: %TRUE if this is a write to the sysctl file
2381 * @buffer: the user buffer
2382 * @lenp: the size of the user buffer
2383 * @ppos: file position
2384 * @ppos: the current position in the file
2385 *
2386 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2387 * values from/to the user buffer, treated as an ASCII string.
2388 * The values read are assumed to be in 1/1000 seconds, and
2389 * are converted into jiffies.
2390 *
2391 * Returns 0 on success.
2392 */
2393 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2394 void __user *buffer, size_t *lenp, loff_t *ppos)
2395 {
2396 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2397 do_proc_dointvec_ms_jiffies_conv, NULL);
2398 }
2399
2400 static int proc_do_cad_pid(struct ctl_table *table, int write,
2401 void __user *buffer, size_t *lenp, loff_t *ppos)
2402 {
2403 struct pid *new_pid;
2404 pid_t tmp;
2405 int r;
2406
2407 tmp = pid_vnr(cad_pid);
2408
2409 r = __do_proc_dointvec(&tmp, table, write, buffer,
2410 lenp, ppos, NULL, NULL);
2411 if (r || !write)
2412 return r;
2413
2414 new_pid = find_get_pid(tmp);
2415 if (!new_pid)
2416 return -ESRCH;
2417
2418 put_pid(xchg(&cad_pid, new_pid));
2419 return 0;
2420 }
2421
2422 /**
2423 * proc_do_large_bitmap - read/write from/to a large bitmap
2424 * @table: the sysctl table
2425 * @write: %TRUE if this is a write to the sysctl file
2426 * @buffer: the user buffer
2427 * @lenp: the size of the user buffer
2428 * @ppos: file position
2429 *
2430 * The bitmap is stored at table->data and the bitmap length (in bits)
2431 * in table->maxlen.
2432 *
2433 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2434 * large bitmaps may be represented in a compact manner. Writing into
2435 * the file will clear the bitmap then update it with the given input.
2436 *
2437 * Returns 0 on success.
2438 */
2439 int proc_do_large_bitmap(struct ctl_table *table, int write,
2440 void __user *buffer, size_t *lenp, loff_t *ppos)
2441 {
2442 int err = 0;
2443 bool first = 1;
2444 size_t left = *lenp;
2445 unsigned long bitmap_len = table->maxlen;
2446 unsigned long *bitmap = (unsigned long *) table->data;
2447 unsigned long *tmp_bitmap = NULL;
2448 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2449
2450 if (!bitmap_len || !left || (*ppos && !write)) {
2451 *lenp = 0;
2452 return 0;
2453 }
2454
2455 if (write) {
2456 unsigned long page = 0;
2457 char *kbuf;
2458
2459 if (left > PAGE_SIZE - 1)
2460 left = PAGE_SIZE - 1;
2461
2462 page = __get_free_page(GFP_TEMPORARY);
2463 kbuf = (char *) page;
2464 if (!kbuf)
2465 return -ENOMEM;
2466 if (copy_from_user(kbuf, buffer, left)) {
2467 free_page(page);
2468 return -EFAULT;
2469 }
2470 kbuf[left] = 0;
2471
2472 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2473 GFP_KERNEL);
2474 if (!tmp_bitmap) {
2475 free_page(page);
2476 return -ENOMEM;
2477 }
2478 proc_skip_char(&kbuf, &left, '\n');
2479 while (!err && left) {
2480 unsigned long val_a, val_b;
2481 bool neg;
2482
2483 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2484 sizeof(tr_a), &c);
2485 if (err)
2486 break;
2487 if (val_a >= bitmap_len || neg) {
2488 err = -EINVAL;
2489 break;
2490 }
2491
2492 val_b = val_a;
2493 if (left) {
2494 kbuf++;
2495 left--;
2496 }
2497
2498 if (c == '-') {
2499 err = proc_get_long(&kbuf, &left, &val_b,
2500 &neg, tr_b, sizeof(tr_b),
2501 &c);
2502 if (err)
2503 break;
2504 if (val_b >= bitmap_len || neg ||
2505 val_a > val_b) {
2506 err = -EINVAL;
2507 break;
2508 }
2509 if (left) {
2510 kbuf++;
2511 left--;
2512 }
2513 }
2514
2515 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2516 first = 0;
2517 proc_skip_char(&kbuf, &left, '\n');
2518 }
2519 free_page(page);
2520 } else {
2521 unsigned long bit_a, bit_b = 0;
2522
2523 while (left) {
2524 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2525 if (bit_a >= bitmap_len)
2526 break;
2527 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2528 bit_a + 1) - 1;
2529
2530 if (!first) {
2531 err = proc_put_char(&buffer, &left, ',');
2532 if (err)
2533 break;
2534 }
2535 err = proc_put_long(&buffer, &left, bit_a, false);
2536 if (err)
2537 break;
2538 if (bit_a != bit_b) {
2539 err = proc_put_char(&buffer, &left, '-');
2540 if (err)
2541 break;
2542 err = proc_put_long(&buffer, &left, bit_b, false);
2543 if (err)
2544 break;
2545 }
2546
2547 first = 0; bit_b++;
2548 }
2549 if (!err)
2550 err = proc_put_char(&buffer, &left, '\n');
2551 }
2552
2553 if (!err) {
2554 if (write) {
2555 if (*ppos)
2556 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2557 else
2558 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2559 }
2560 kfree(tmp_bitmap);
2561 *lenp -= left;
2562 *ppos += *lenp;
2563 return 0;
2564 } else {
2565 kfree(tmp_bitmap);
2566 return err;
2567 }
2568 }
2569
2570 #else /* CONFIG_PROC_SYSCTL */
2571
2572 int proc_dostring(struct ctl_table *table, int write,
2573 void __user *buffer, size_t *lenp, loff_t *ppos)
2574 {
2575 return -ENOSYS;
2576 }
2577
2578 int proc_dointvec(struct ctl_table *table, int write,
2579 void __user *buffer, size_t *lenp, loff_t *ppos)
2580 {
2581 return -ENOSYS;
2582 }
2583
2584 int proc_dointvec_minmax(struct ctl_table *table, int write,
2585 void __user *buffer, size_t *lenp, loff_t *ppos)
2586 {
2587 return -ENOSYS;
2588 }
2589
2590 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2591 void __user *buffer, size_t *lenp, loff_t *ppos)
2592 {
2593 return -ENOSYS;
2594 }
2595
2596 int proc_dointvec_userhz_jiffies(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_ms_jiffies(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_doulongvec_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_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2615 void __user *buffer,
2616 size_t *lenp, loff_t *ppos)
2617 {
2618 return -ENOSYS;
2619 }
2620
2621
2622 #endif /* CONFIG_PROC_SYSCTL */
2623
2624 /*
2625 * No sense putting this after each symbol definition, twice,
2626 * exception granted :-)
2627 */
2628 EXPORT_SYMBOL(proc_dointvec);
2629 EXPORT_SYMBOL(proc_dointvec_jiffies);
2630 EXPORT_SYMBOL(proc_dointvec_minmax);
2631 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2632 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2633 EXPORT_SYMBOL(proc_dostring);
2634 EXPORT_SYMBOL(proc_doulongvec_minmax);
2635 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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