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Merge branch 'x86-uv-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / kernel / sysctl.c
blob4ce13c3cedb97a8bb4eb402d02bc10f79c35245e
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 {
1047 .procname = "perf_cpu_time_max_percent",
1048 .data = &sysctl_perf_cpu_time_max_percent,
1049 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1050 .mode = 0644,
1051 .proc_handler = perf_cpu_time_max_percent_handler,
1052 .extra1 = &zero,
1053 .extra2 = &one_hundred,
1054 },
1055 #endif
1056 #ifdef CONFIG_KMEMCHECK
1057 {
1058 .procname = "kmemcheck",
1059 .data = &kmemcheck_enabled,
1060 .maxlen = sizeof(int),
1061 .mode = 0644,
1062 .proc_handler = proc_dointvec,
1063 },
1064 #endif
1065 #ifdef CONFIG_BLOCK
1066 {
1067 .procname = "blk_iopoll",
1068 .data = &blk_iopoll_enabled,
1069 .maxlen = sizeof(int),
1070 .mode = 0644,
1071 .proc_handler = proc_dointvec,
1072 },
1073 #endif
1074 { }
1075 };
1076
1077 static struct ctl_table vm_table[] = {
1078 {
1079 .procname = "overcommit_memory",
1080 .data = &sysctl_overcommit_memory,
1081 .maxlen = sizeof(sysctl_overcommit_memory),
1082 .mode = 0644,
1083 .proc_handler = proc_dointvec_minmax,
1084 .extra1 = &zero,
1085 .extra2 = &two,
1086 },
1087 {
1088 .procname = "panic_on_oom",
1089 .data = &sysctl_panic_on_oom,
1090 .maxlen = sizeof(sysctl_panic_on_oom),
1091 .mode = 0644,
1092 .proc_handler = proc_dointvec_minmax,
1093 .extra1 = &zero,
1094 .extra2 = &two,
1095 },
1096 {
1097 .procname = "oom_kill_allocating_task",
1098 .data = &sysctl_oom_kill_allocating_task,
1099 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1100 .mode = 0644,
1101 .proc_handler = proc_dointvec,
1102 },
1103 {
1104 .procname = "oom_dump_tasks",
1105 .data = &sysctl_oom_dump_tasks,
1106 .maxlen = sizeof(sysctl_oom_dump_tasks),
1107 .mode = 0644,
1108 .proc_handler = proc_dointvec,
1109 },
1110 {
1111 .procname = "overcommit_ratio",
1112 .data = &sysctl_overcommit_ratio,
1113 .maxlen = sizeof(sysctl_overcommit_ratio),
1114 .mode = 0644,
1115 .proc_handler = proc_dointvec,
1116 },
1117 {
1118 .procname = "page-cluster",
1119 .data = &page_cluster,
1120 .maxlen = sizeof(int),
1121 .mode = 0644,
1122 .proc_handler = proc_dointvec_minmax,
1123 .extra1 = &zero,
1124 },
1125 {
1126 .procname = "dirty_background_ratio",
1127 .data = &dirty_background_ratio,
1128 .maxlen = sizeof(dirty_background_ratio),
1129 .mode = 0644,
1130 .proc_handler = dirty_background_ratio_handler,
1131 .extra1 = &zero,
1132 .extra2 = &one_hundred,
1133 },
1134 {
1135 .procname = "dirty_background_bytes",
1136 .data = &dirty_background_bytes,
1137 .maxlen = sizeof(dirty_background_bytes),
1138 .mode = 0644,
1139 .proc_handler = dirty_background_bytes_handler,
1140 .extra1 = &one_ul,
1141 },
1142 {
1143 .procname = "dirty_ratio",
1144 .data = &vm_dirty_ratio,
1145 .maxlen = sizeof(vm_dirty_ratio),
1146 .mode = 0644,
1147 .proc_handler = dirty_ratio_handler,
1148 .extra1 = &zero,
1149 .extra2 = &one_hundred,
1150 },
1151 {
1152 .procname = "dirty_bytes",
1153 .data = &vm_dirty_bytes,
1154 .maxlen = sizeof(vm_dirty_bytes),
1155 .mode = 0644,
1156 .proc_handler = dirty_bytes_handler,
1157 .extra1 = &dirty_bytes_min,
1158 },
1159 {
1160 .procname = "dirty_writeback_centisecs",
1161 .data = &dirty_writeback_interval,
1162 .maxlen = sizeof(dirty_writeback_interval),
1163 .mode = 0644,
1164 .proc_handler = dirty_writeback_centisecs_handler,
1165 },
1166 {
1167 .procname = "dirty_expire_centisecs",
1168 .data = &dirty_expire_interval,
1169 .maxlen = sizeof(dirty_expire_interval),
1170 .mode = 0644,
1171 .proc_handler = proc_dointvec_minmax,
1172 .extra1 = &zero,
1173 },
1174 {
1175 .procname = "nr_pdflush_threads",
1176 .mode = 0444 /* read-only */,
1177 .proc_handler = pdflush_proc_obsolete,
1178 },
1179 {
1180 .procname = "swappiness",
1181 .data = &vm_swappiness,
1182 .maxlen = sizeof(vm_swappiness),
1183 .mode = 0644,
1184 .proc_handler = proc_dointvec_minmax,
1185 .extra1 = &zero,
1186 .extra2 = &one_hundred,
1187 },
1188 #ifdef CONFIG_HUGETLB_PAGE
1189 {
1190 .procname = "nr_hugepages",
1191 .data = NULL,
1192 .maxlen = sizeof(unsigned long),
1193 .mode = 0644,
1194 .proc_handler = hugetlb_sysctl_handler,
1195 .extra1 = (void *)&hugetlb_zero,
1196 .extra2 = (void *)&hugetlb_infinity,
1197 },
1198 #ifdef CONFIG_NUMA
1199 {
1200 .procname = "nr_hugepages_mempolicy",
1201 .data = NULL,
1202 .maxlen = sizeof(unsigned long),
1203 .mode = 0644,
1204 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1205 .extra1 = (void *)&hugetlb_zero,
1206 .extra2 = (void *)&hugetlb_infinity,
1207 },
1208 #endif
1209 {
1210 .procname = "hugetlb_shm_group",
1211 .data = &sysctl_hugetlb_shm_group,
1212 .maxlen = sizeof(gid_t),
1213 .mode = 0644,
1214 .proc_handler = proc_dointvec,
1215 },
1216 {
1217 .procname = "hugepages_treat_as_movable",
1218 .data = &hugepages_treat_as_movable,
1219 .maxlen = sizeof(int),
1220 .mode = 0644,
1221 .proc_handler = hugetlb_treat_movable_handler,
1222 },
1223 {
1224 .procname = "nr_overcommit_hugepages",
1225 .data = NULL,
1226 .maxlen = sizeof(unsigned long),
1227 .mode = 0644,
1228 .proc_handler = hugetlb_overcommit_handler,
1229 .extra1 = (void *)&hugetlb_zero,
1230 .extra2 = (void *)&hugetlb_infinity,
1231 },
1232 #endif
1233 {
1234 .procname = "lowmem_reserve_ratio",
1235 .data = &sysctl_lowmem_reserve_ratio,
1236 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1237 .mode = 0644,
1238 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1239 },
1240 {
1241 .procname = "drop_caches",
1242 .data = &sysctl_drop_caches,
1243 .maxlen = sizeof(int),
1244 .mode = 0644,
1245 .proc_handler = drop_caches_sysctl_handler,
1246 .extra1 = &one,
1247 .extra2 = &three,
1248 },
1249 #ifdef CONFIG_COMPACTION
1250 {
1251 .procname = "compact_memory",
1252 .data = &sysctl_compact_memory,
1253 .maxlen = sizeof(int),
1254 .mode = 0200,
1255 .proc_handler = sysctl_compaction_handler,
1256 },
1257 {
1258 .procname = "extfrag_threshold",
1259 .data = &sysctl_extfrag_threshold,
1260 .maxlen = sizeof(int),
1261 .mode = 0644,
1262 .proc_handler = sysctl_extfrag_handler,
1263 .extra1 = &min_extfrag_threshold,
1264 .extra2 = &max_extfrag_threshold,
1265 },
1266
1267 #endif /* CONFIG_COMPACTION */
1268 {
1269 .procname = "min_free_kbytes",
1270 .data = &min_free_kbytes,
1271 .maxlen = sizeof(min_free_kbytes),
1272 .mode = 0644,
1273 .proc_handler = min_free_kbytes_sysctl_handler,
1274 .extra1 = &zero,
1275 },
1276 {
1277 .procname = "percpu_pagelist_fraction",
1278 .data = &percpu_pagelist_fraction,
1279 .maxlen = sizeof(percpu_pagelist_fraction),
1280 .mode = 0644,
1281 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1282 .extra1 = &min_percpu_pagelist_fract,
1283 },
1284 #ifdef CONFIG_MMU
1285 {
1286 .procname = "max_map_count",
1287 .data = &sysctl_max_map_count,
1288 .maxlen = sizeof(sysctl_max_map_count),
1289 .mode = 0644,
1290 .proc_handler = proc_dointvec_minmax,
1291 .extra1 = &zero,
1292 },
1293 #else
1294 {
1295 .procname = "nr_trim_pages",
1296 .data = &sysctl_nr_trim_pages,
1297 .maxlen = sizeof(sysctl_nr_trim_pages),
1298 .mode = 0644,
1299 .proc_handler = proc_dointvec_minmax,
1300 .extra1 = &zero,
1301 },
1302 #endif
1303 {
1304 .procname = "laptop_mode",
1305 .data = &laptop_mode,
1306 .maxlen = sizeof(laptop_mode),
1307 .mode = 0644,
1308 .proc_handler = proc_dointvec_jiffies,
1309 },
1310 {
1311 .procname = "block_dump",
1312 .data = &block_dump,
1313 .maxlen = sizeof(block_dump),
1314 .mode = 0644,
1315 .proc_handler = proc_dointvec,
1316 .extra1 = &zero,
1317 },
1318 {
1319 .procname = "vfs_cache_pressure",
1320 .data = &sysctl_vfs_cache_pressure,
1321 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1322 .mode = 0644,
1323 .proc_handler = proc_dointvec,
1324 .extra1 = &zero,
1325 },
1326 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1327 {
1328 .procname = "legacy_va_layout",
1329 .data = &sysctl_legacy_va_layout,
1330 .maxlen = sizeof(sysctl_legacy_va_layout),
1331 .mode = 0644,
1332 .proc_handler = proc_dointvec,
1333 .extra1 = &zero,
1334 },
1335 #endif
1336 #ifdef CONFIG_NUMA
1337 {
1338 .procname = "zone_reclaim_mode",
1339 .data = &zone_reclaim_mode,
1340 .maxlen = sizeof(zone_reclaim_mode),
1341 .mode = 0644,
1342 .proc_handler = proc_dointvec,
1343 .extra1 = &zero,
1344 },
1345 {
1346 .procname = "min_unmapped_ratio",
1347 .data = &sysctl_min_unmapped_ratio,
1348 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1349 .mode = 0644,
1350 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1351 .extra1 = &zero,
1352 .extra2 = &one_hundred,
1353 },
1354 {
1355 .procname = "min_slab_ratio",
1356 .data = &sysctl_min_slab_ratio,
1357 .maxlen = sizeof(sysctl_min_slab_ratio),
1358 .mode = 0644,
1359 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1360 .extra1 = &zero,
1361 .extra2 = &one_hundred,
1362 },
1363 #endif
1364 #ifdef CONFIG_SMP
1365 {
1366 .procname = "stat_interval",
1367 .data = &sysctl_stat_interval,
1368 .maxlen = sizeof(sysctl_stat_interval),
1369 .mode = 0644,
1370 .proc_handler = proc_dointvec_jiffies,
1371 },
1372 #endif
1373 #ifdef CONFIG_MMU
1374 {
1375 .procname = "mmap_min_addr",
1376 .data = &dac_mmap_min_addr,
1377 .maxlen = sizeof(unsigned long),
1378 .mode = 0644,
1379 .proc_handler = mmap_min_addr_handler,
1380 },
1381 #endif
1382 #ifdef CONFIG_NUMA
1383 {
1384 .procname = "numa_zonelist_order",
1385 .data = &numa_zonelist_order,
1386 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1387 .mode = 0644,
1388 .proc_handler = numa_zonelist_order_handler,
1389 },
1390 #endif
1391 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1392 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1393 {
1394 .procname = "vdso_enabled",
1395 .data = &vdso_enabled,
1396 .maxlen = sizeof(vdso_enabled),
1397 .mode = 0644,
1398 .proc_handler = proc_dointvec,
1399 .extra1 = &zero,
1400 },
1401 #endif
1402 #ifdef CONFIG_HIGHMEM
1403 {
1404 .procname = "highmem_is_dirtyable",
1405 .data = &vm_highmem_is_dirtyable,
1406 .maxlen = sizeof(vm_highmem_is_dirtyable),
1407 .mode = 0644,
1408 .proc_handler = proc_dointvec_minmax,
1409 .extra1 = &zero,
1410 .extra2 = &one,
1411 },
1412 #endif
1413 {
1414 .procname = "scan_unevictable_pages",
1415 .data = &scan_unevictable_pages,
1416 .maxlen = sizeof(scan_unevictable_pages),
1417 .mode = 0644,
1418 .proc_handler = scan_unevictable_handler,
1419 },
1420 #ifdef CONFIG_MEMORY_FAILURE
1421 {
1422 .procname = "memory_failure_early_kill",
1423 .data = &sysctl_memory_failure_early_kill,
1424 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1425 .mode = 0644,
1426 .proc_handler = proc_dointvec_minmax,
1427 .extra1 = &zero,
1428 .extra2 = &one,
1429 },
1430 {
1431 .procname = "memory_failure_recovery",
1432 .data = &sysctl_memory_failure_recovery,
1433 .maxlen = sizeof(sysctl_memory_failure_recovery),
1434 .mode = 0644,
1435 .proc_handler = proc_dointvec_minmax,
1436 .extra1 = &zero,
1437 .extra2 = &one,
1438 },
1439 #endif
1440 {
1441 .procname = "user_reserve_kbytes",
1442 .data = &sysctl_user_reserve_kbytes,
1443 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1444 .mode = 0644,
1445 .proc_handler = proc_doulongvec_minmax,
1446 },
1447 {
1448 .procname = "admin_reserve_kbytes",
1449 .data = &sysctl_admin_reserve_kbytes,
1450 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1451 .mode = 0644,
1452 .proc_handler = proc_doulongvec_minmax,
1453 },
1454 { }
1455 };
1456
1457 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1458 static struct ctl_table binfmt_misc_table[] = {
1459 { }
1460 };
1461 #endif
1462
1463 static struct ctl_table fs_table[] = {
1464 {
1465 .procname = "inode-nr",
1466 .data = &inodes_stat,
1467 .maxlen = 2*sizeof(int),
1468 .mode = 0444,
1469 .proc_handler = proc_nr_inodes,
1470 },
1471 {
1472 .procname = "inode-state",
1473 .data = &inodes_stat,
1474 .maxlen = 7*sizeof(int),
1475 .mode = 0444,
1476 .proc_handler = proc_nr_inodes,
1477 },
1478 {
1479 .procname = "file-nr",
1480 .data = &files_stat,
1481 .maxlen = sizeof(files_stat),
1482 .mode = 0444,
1483 .proc_handler = proc_nr_files,
1484 },
1485 {
1486 .procname = "file-max",
1487 .data = &files_stat.max_files,
1488 .maxlen = sizeof(files_stat.max_files),
1489 .mode = 0644,
1490 .proc_handler = proc_doulongvec_minmax,
1491 },
1492 {
1493 .procname = "nr_open",
1494 .data = &sysctl_nr_open,
1495 .maxlen = sizeof(int),
1496 .mode = 0644,
1497 .proc_handler = proc_dointvec_minmax,
1498 .extra1 = &sysctl_nr_open_min,
1499 .extra2 = &sysctl_nr_open_max,
1500 },
1501 {
1502 .procname = "dentry-state",
1503 .data = &dentry_stat,
1504 .maxlen = 6*sizeof(int),
1505 .mode = 0444,
1506 .proc_handler = proc_nr_dentry,
1507 },
1508 {
1509 .procname = "overflowuid",
1510 .data = &fs_overflowuid,
1511 .maxlen = sizeof(int),
1512 .mode = 0644,
1513 .proc_handler = proc_dointvec_minmax,
1514 .extra1 = &minolduid,
1515 .extra2 = &maxolduid,
1516 },
1517 {
1518 .procname = "overflowgid",
1519 .data = &fs_overflowgid,
1520 .maxlen = sizeof(int),
1521 .mode = 0644,
1522 .proc_handler = proc_dointvec_minmax,
1523 .extra1 = &minolduid,
1524 .extra2 = &maxolduid,
1525 },
1526 #ifdef CONFIG_FILE_LOCKING
1527 {
1528 .procname = "leases-enable",
1529 .data = &leases_enable,
1530 .maxlen = sizeof(int),
1531 .mode = 0644,
1532 .proc_handler = proc_dointvec,
1533 },
1534 #endif
1535 #ifdef CONFIG_DNOTIFY
1536 {
1537 .procname = "dir-notify-enable",
1538 .data = &dir_notify_enable,
1539 .maxlen = sizeof(int),
1540 .mode = 0644,
1541 .proc_handler = proc_dointvec,
1542 },
1543 #endif
1544 #ifdef CONFIG_MMU
1545 #ifdef CONFIG_FILE_LOCKING
1546 {
1547 .procname = "lease-break-time",
1548 .data = &lease_break_time,
1549 .maxlen = sizeof(int),
1550 .mode = 0644,
1551 .proc_handler = proc_dointvec,
1552 },
1553 #endif
1554 #ifdef CONFIG_AIO
1555 {
1556 .procname = "aio-nr",
1557 .data = &aio_nr,
1558 .maxlen = sizeof(aio_nr),
1559 .mode = 0444,
1560 .proc_handler = proc_doulongvec_minmax,
1561 },
1562 {
1563 .procname = "aio-max-nr",
1564 .data = &aio_max_nr,
1565 .maxlen = sizeof(aio_max_nr),
1566 .mode = 0644,
1567 .proc_handler = proc_doulongvec_minmax,
1568 },
1569 #endif /* CONFIG_AIO */
1570 #ifdef CONFIG_INOTIFY_USER
1571 {
1572 .procname = "inotify",
1573 .mode = 0555,
1574 .child = inotify_table,
1575 },
1576 #endif
1577 #ifdef CONFIG_EPOLL
1578 {
1579 .procname = "epoll",
1580 .mode = 0555,
1581 .child = epoll_table,
1582 },
1583 #endif
1584 #endif
1585 {
1586 .procname = "protected_symlinks",
1587 .data = &sysctl_protected_symlinks,
1588 .maxlen = sizeof(int),
1589 .mode = 0600,
1590 .proc_handler = proc_dointvec_minmax,
1591 .extra1 = &zero,
1592 .extra2 = &one,
1593 },
1594 {
1595 .procname = "protected_hardlinks",
1596 .data = &sysctl_protected_hardlinks,
1597 .maxlen = sizeof(int),
1598 .mode = 0600,
1599 .proc_handler = proc_dointvec_minmax,
1600 .extra1 = &zero,
1601 .extra2 = &one,
1602 },
1603 {
1604 .procname = "suid_dumpable",
1605 .data = &suid_dumpable,
1606 .maxlen = sizeof(int),
1607 .mode = 0644,
1608 .proc_handler = proc_dointvec_minmax_coredump,
1609 .extra1 = &zero,
1610 .extra2 = &two,
1611 },
1612 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1613 {
1614 .procname = "binfmt_misc",
1615 .mode = 0555,
1616 .child = binfmt_misc_table,
1617 },
1618 #endif
1619 {
1620 .procname = "pipe-max-size",
1621 .data = &pipe_max_size,
1622 .maxlen = sizeof(int),
1623 .mode = 0644,
1624 .proc_handler = &pipe_proc_fn,
1625 .extra1 = &pipe_min_size,
1626 },
1627 { }
1628 };
1629
1630 static struct ctl_table debug_table[] = {
1631 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1632 {
1633 .procname = "exception-trace",
1634 .data = &show_unhandled_signals,
1635 .maxlen = sizeof(int),
1636 .mode = 0644,
1637 .proc_handler = proc_dointvec
1638 },
1639 #endif
1640 #if defined(CONFIG_OPTPROBES)
1641 {
1642 .procname = "kprobes-optimization",
1643 .data = &sysctl_kprobes_optimization,
1644 .maxlen = sizeof(int),
1645 .mode = 0644,
1646 .proc_handler = proc_kprobes_optimization_handler,
1647 .extra1 = &zero,
1648 .extra2 = &one,
1649 },
1650 #endif
1651 { }
1652 };
1653
1654 static struct ctl_table dev_table[] = {
1655 { }
1656 };
1657
1658 int __init sysctl_init(void)
1659 {
1660 struct ctl_table_header *hdr;
1661
1662 hdr = register_sysctl_table(sysctl_base_table);
1663 kmemleak_not_leak(hdr);
1664 return 0;
1665 }
1666
1667 #endif /* CONFIG_SYSCTL */
1668
1669 /*
1670 * /proc/sys support
1671 */
1672
1673 #ifdef CONFIG_PROC_SYSCTL
1674
1675 static int _proc_do_string(void* data, int maxlen, int write,
1676 void __user *buffer,
1677 size_t *lenp, loff_t *ppos)
1678 {
1679 size_t len;
1680 char __user *p;
1681 char c;
1682
1683 if (!data || !maxlen || !*lenp) {
1684 *lenp = 0;
1685 return 0;
1686 }
1687
1688 if (write) {
1689 len = 0;
1690 p = buffer;
1691 while (len < *lenp) {
1692 if (get_user(c, p++))
1693 return -EFAULT;
1694 if (c == 0 || c == '\n')
1695 break;
1696 len++;
1697 }
1698 if (len >= maxlen)
1699 len = maxlen-1;
1700 if(copy_from_user(data, buffer, len))
1701 return -EFAULT;
1702 ((char *) data)[len] = 0;
1703 *ppos += *lenp;
1704 } else {
1705 len = strlen(data);
1706 if (len > maxlen)
1707 len = maxlen;
1708
1709 if (*ppos > len) {
1710 *lenp = 0;
1711 return 0;
1712 }
1713
1714 data += *ppos;
1715 len -= *ppos;
1716
1717 if (len > *lenp)
1718 len = *lenp;
1719 if (len)
1720 if(copy_to_user(buffer, data, len))
1721 return -EFAULT;
1722 if (len < *lenp) {
1723 if(put_user('\n', ((char __user *) buffer) + len))
1724 return -EFAULT;
1725 len++;
1726 }
1727 *lenp = len;
1728 *ppos += len;
1729 }
1730 return 0;
1731 }
1732
1733 /**
1734 * proc_dostring - read a string sysctl
1735 * @table: the sysctl table
1736 * @write: %TRUE if this is a write to the sysctl file
1737 * @buffer: the user buffer
1738 * @lenp: the size of the user buffer
1739 * @ppos: file position
1740 *
1741 * Reads/writes a string from/to the user buffer. If the kernel
1742 * buffer provided is not large enough to hold the string, the
1743 * string is truncated. The copied string is %NULL-terminated.
1744 * If the string is being read by the user process, it is copied
1745 * and a newline '\n' is added. It is truncated if the buffer is
1746 * not large enough.
1747 *
1748 * Returns 0 on success.
1749 */
1750 int proc_dostring(struct ctl_table *table, int write,
1751 void __user *buffer, size_t *lenp, loff_t *ppos)
1752 {
1753 return _proc_do_string(table->data, table->maxlen, write,
1754 buffer, lenp, ppos);
1755 }
1756
1757 static size_t proc_skip_spaces(char **buf)
1758 {
1759 size_t ret;
1760 char *tmp = skip_spaces(*buf);
1761 ret = tmp - *buf;
1762 *buf = tmp;
1763 return ret;
1764 }
1765
1766 static void proc_skip_char(char **buf, size_t *size, const char v)
1767 {
1768 while (*size) {
1769 if (**buf != v)
1770 break;
1771 (*size)--;
1772 (*buf)++;
1773 }
1774 }
1775
1776 #define TMPBUFLEN 22
1777 /**
1778 * proc_get_long - reads an ASCII formatted integer from a user buffer
1779 *
1780 * @buf: a kernel buffer
1781 * @size: size of the kernel buffer
1782 * @val: this is where the number will be stored
1783 * @neg: set to %TRUE if number is negative
1784 * @perm_tr: a vector which contains the allowed trailers
1785 * @perm_tr_len: size of the perm_tr vector
1786 * @tr: pointer to store the trailer character
1787 *
1788 * In case of success %0 is returned and @buf and @size are updated with
1789 * the amount of bytes read. If @tr is non-NULL and a trailing
1790 * character exists (size is non-zero after returning from this
1791 * function), @tr is updated with the trailing character.
1792 */
1793 static int proc_get_long(char **buf, size_t *size,
1794 unsigned long *val, bool *neg,
1795 const char *perm_tr, unsigned perm_tr_len, char *tr)
1796 {
1797 int len;
1798 char *p, tmp[TMPBUFLEN];
1799
1800 if (!*size)
1801 return -EINVAL;
1802
1803 len = *size;
1804 if (len > TMPBUFLEN - 1)
1805 len = TMPBUFLEN - 1;
1806
1807 memcpy(tmp, *buf, len);
1808
1809 tmp[len] = 0;
1810 p = tmp;
1811 if (*p == '-' && *size > 1) {
1812 *neg = true;
1813 p++;
1814 } else
1815 *neg = false;
1816 if (!isdigit(*p))
1817 return -EINVAL;
1818
1819 *val = simple_strtoul(p, &p, 0);
1820
1821 len = p - tmp;
1822
1823 /* We don't know if the next char is whitespace thus we may accept
1824 * invalid integers (e.g. 1234...a) or two integers instead of one
1825 * (e.g. 123...1). So lets not allow such large numbers. */
1826 if (len == TMPBUFLEN - 1)
1827 return -EINVAL;
1828
1829 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1830 return -EINVAL;
1831
1832 if (tr && (len < *size))
1833 *tr = *p;
1834
1835 *buf += len;
1836 *size -= len;
1837
1838 return 0;
1839 }
1840
1841 /**
1842 * proc_put_long - converts an integer to a decimal ASCII formatted string
1843 *
1844 * @buf: the user buffer
1845 * @size: the size of the user buffer
1846 * @val: the integer to be converted
1847 * @neg: sign of the number, %TRUE for negative
1848 *
1849 * In case of success %0 is returned and @buf and @size are updated with
1850 * the amount of bytes written.
1851 */
1852 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1853 bool neg)
1854 {
1855 int len;
1856 char tmp[TMPBUFLEN], *p = tmp;
1857
1858 sprintf(p, "%s%lu", neg ? "-" : "", val);
1859 len = strlen(tmp);
1860 if (len > *size)
1861 len = *size;
1862 if (copy_to_user(*buf, tmp, len))
1863 return -EFAULT;
1864 *size -= len;
1865 *buf += len;
1866 return 0;
1867 }
1868 #undef TMPBUFLEN
1869
1870 static int proc_put_char(void __user **buf, size_t *size, char c)
1871 {
1872 if (*size) {
1873 char __user **buffer = (char __user **)buf;
1874 if (put_user(c, *buffer))
1875 return -EFAULT;
1876 (*size)--, (*buffer)++;
1877 *buf = *buffer;
1878 }
1879 return 0;
1880 }
1881
1882 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1883 int *valp,
1884 int write, void *data)
1885 {
1886 if (write) {
1887 *valp = *negp ? -*lvalp : *lvalp;
1888 } else {
1889 int val = *valp;
1890 if (val < 0) {
1891 *negp = true;
1892 *lvalp = (unsigned long)-val;
1893 } else {
1894 *negp = false;
1895 *lvalp = (unsigned long)val;
1896 }
1897 }
1898 return 0;
1899 }
1900
1901 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1902
1903 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1904 int write, void __user *buffer,
1905 size_t *lenp, loff_t *ppos,
1906 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1907 int write, void *data),
1908 void *data)
1909 {
1910 int *i, vleft, first = 1, err = 0;
1911 unsigned long page = 0;
1912 size_t left;
1913 char *kbuf;
1914
1915 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1916 *lenp = 0;
1917 return 0;
1918 }
1919
1920 i = (int *) tbl_data;
1921 vleft = table->maxlen / sizeof(*i);
1922 left = *lenp;
1923
1924 if (!conv)
1925 conv = do_proc_dointvec_conv;
1926
1927 if (write) {
1928 if (left > PAGE_SIZE - 1)
1929 left = PAGE_SIZE - 1;
1930 page = __get_free_page(GFP_TEMPORARY);
1931 kbuf = (char *) page;
1932 if (!kbuf)
1933 return -ENOMEM;
1934 if (copy_from_user(kbuf, buffer, left)) {
1935 err = -EFAULT;
1936 goto free;
1937 }
1938 kbuf[left] = 0;
1939 }
1940
1941 for (; left && vleft--; i++, first=0) {
1942 unsigned long lval;
1943 bool neg;
1944
1945 if (write) {
1946 left -= proc_skip_spaces(&kbuf);
1947
1948 if (!left)
1949 break;
1950 err = proc_get_long(&kbuf, &left, &lval, &neg,
1951 proc_wspace_sep,
1952 sizeof(proc_wspace_sep), NULL);
1953 if (err)
1954 break;
1955 if (conv(&neg, &lval, i, 1, data)) {
1956 err = -EINVAL;
1957 break;
1958 }
1959 } else {
1960 if (conv(&neg, &lval, i, 0, data)) {
1961 err = -EINVAL;
1962 break;
1963 }
1964 if (!first)
1965 err = proc_put_char(&buffer, &left, '\t');
1966 if (err)
1967 break;
1968 err = proc_put_long(&buffer, &left, lval, neg);
1969 if (err)
1970 break;
1971 }
1972 }
1973
1974 if (!write && !first && left && !err)
1975 err = proc_put_char(&buffer, &left, '\n');
1976 if (write && !err && left)
1977 left -= proc_skip_spaces(&kbuf);
1978 free:
1979 if (write) {
1980 free_page(page);
1981 if (first)
1982 return err ? : -EINVAL;
1983 }
1984 *lenp -= left;
1985 *ppos += *lenp;
1986 return err;
1987 }
1988
1989 static int do_proc_dointvec(struct ctl_table *table, int write,
1990 void __user *buffer, size_t *lenp, loff_t *ppos,
1991 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1992 int write, void *data),
1993 void *data)
1994 {
1995 return __do_proc_dointvec(table->data, table, write,
1996 buffer, lenp, ppos, conv, data);
1997 }
1998
1999 /**
2000 * proc_dointvec - read a vector of integers
2001 * @table: the sysctl table
2002 * @write: %TRUE if this is a write to the sysctl file
2003 * @buffer: the user buffer
2004 * @lenp: the size of the user buffer
2005 * @ppos: file position
2006 *
2007 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2008 * values from/to the user buffer, treated as an ASCII string.
2009 *
2010 * Returns 0 on success.
2011 */
2012 int proc_dointvec(struct ctl_table *table, int write,
2013 void __user *buffer, size_t *lenp, loff_t *ppos)
2014 {
2015 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2016 NULL,NULL);
2017 }
2018
2019 /*
2020 * Taint values can only be increased
2021 * This means we can safely use a temporary.
2022 */
2023 static int proc_taint(struct ctl_table *table, int write,
2024 void __user *buffer, size_t *lenp, loff_t *ppos)
2025 {
2026 struct ctl_table t;
2027 unsigned long tmptaint = get_taint();
2028 int err;
2029
2030 if (write && !capable(CAP_SYS_ADMIN))
2031 return -EPERM;
2032
2033 t = *table;
2034 t.data = &tmptaint;
2035 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2036 if (err < 0)
2037 return err;
2038
2039 if (write) {
2040 /*
2041 * Poor man's atomic or. Not worth adding a primitive
2042 * to everyone's atomic.h for this
2043 */
2044 int i;
2045 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2046 if ((tmptaint >> i) & 1)
2047 add_taint(i, LOCKDEP_STILL_OK);
2048 }
2049 }
2050
2051 return err;
2052 }
2053
2054 #ifdef CONFIG_PRINTK
2055 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2056 void __user *buffer, size_t *lenp, loff_t *ppos)
2057 {
2058 if (write && !capable(CAP_SYS_ADMIN))
2059 return -EPERM;
2060
2061 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2062 }
2063 #endif
2064
2065 struct do_proc_dointvec_minmax_conv_param {
2066 int *min;
2067 int *max;
2068 };
2069
2070 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2071 int *valp,
2072 int write, void *data)
2073 {
2074 struct do_proc_dointvec_minmax_conv_param *param = data;
2075 if (write) {
2076 int val = *negp ? -*lvalp : *lvalp;
2077 if ((param->min && *param->min > val) ||
2078 (param->max && *param->max < val))
2079 return -EINVAL;
2080 *valp = val;
2081 } else {
2082 int val = *valp;
2083 if (val < 0) {
2084 *negp = true;
2085 *lvalp = (unsigned long)-val;
2086 } else {
2087 *negp = false;
2088 *lvalp = (unsigned long)val;
2089 }
2090 }
2091 return 0;
2092 }
2093
2094 /**
2095 * proc_dointvec_minmax - read a vector of integers with min/max values
2096 * @table: the sysctl table
2097 * @write: %TRUE if this is a write to the sysctl file
2098 * @buffer: the user buffer
2099 * @lenp: the size of the user buffer
2100 * @ppos: file position
2101 *
2102 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2103 * values from/to the user buffer, treated as an ASCII string.
2104 *
2105 * This routine will ensure the values are within the range specified by
2106 * table->extra1 (min) and table->extra2 (max).
2107 *
2108 * Returns 0 on success.
2109 */
2110 int proc_dointvec_minmax(struct ctl_table *table, int write,
2111 void __user *buffer, size_t *lenp, loff_t *ppos)
2112 {
2113 struct do_proc_dointvec_minmax_conv_param param = {
2114 .min = (int *) table->extra1,
2115 .max = (int *) table->extra2,
2116 };
2117 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2118 do_proc_dointvec_minmax_conv, &param);
2119 }
2120
2121 static void validate_coredump_safety(void)
2122 {
2123 #ifdef CONFIG_COREDUMP
2124 if (suid_dumpable == SUID_DUMP_ROOT &&
2125 core_pattern[0] != '/' && core_pattern[0] != '|') {
2126 printk(KERN_WARNING "Unsafe core_pattern used with "\
2127 "suid_dumpable=2. Pipe handler or fully qualified "\
2128 "core dump path required.\n");
2129 }
2130 #endif
2131 }
2132
2133 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2134 void __user *buffer, size_t *lenp, loff_t *ppos)
2135 {
2136 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2137 if (!error)
2138 validate_coredump_safety();
2139 return error;
2140 }
2141
2142 #ifdef CONFIG_COREDUMP
2143 static int proc_dostring_coredump(struct ctl_table *table, int write,
2144 void __user *buffer, size_t *lenp, loff_t *ppos)
2145 {
2146 int error = proc_dostring(table, write, buffer, lenp, ppos);
2147 if (!error)
2148 validate_coredump_safety();
2149 return error;
2150 }
2151 #endif
2152
2153 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2154 void __user *buffer,
2155 size_t *lenp, loff_t *ppos,
2156 unsigned long convmul,
2157 unsigned long convdiv)
2158 {
2159 unsigned long *i, *min, *max;
2160 int vleft, first = 1, err = 0;
2161 unsigned long page = 0;
2162 size_t left;
2163 char *kbuf;
2164
2165 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2166 *lenp = 0;
2167 return 0;
2168 }
2169
2170 i = (unsigned long *) data;
2171 min = (unsigned long *) table->extra1;
2172 max = (unsigned long *) table->extra2;
2173 vleft = table->maxlen / sizeof(unsigned long);
2174 left = *lenp;
2175
2176 if (write) {
2177 if (left > PAGE_SIZE - 1)
2178 left = PAGE_SIZE - 1;
2179 page = __get_free_page(GFP_TEMPORARY);
2180 kbuf = (char *) page;
2181 if (!kbuf)
2182 return -ENOMEM;
2183 if (copy_from_user(kbuf, buffer, left)) {
2184 err = -EFAULT;
2185 goto free;
2186 }
2187 kbuf[left] = 0;
2188 }
2189
2190 for (; left && vleft--; i++, first = 0) {
2191 unsigned long val;
2192
2193 if (write) {
2194 bool neg;
2195
2196 left -= proc_skip_spaces(&kbuf);
2197
2198 err = proc_get_long(&kbuf, &left, &val, &neg,
2199 proc_wspace_sep,
2200 sizeof(proc_wspace_sep), NULL);
2201 if (err)
2202 break;
2203 if (neg)
2204 continue;
2205 if ((min && val < *min) || (max && val > *max))
2206 continue;
2207 *i = val;
2208 } else {
2209 val = convdiv * (*i) / convmul;
2210 if (!first)
2211 err = proc_put_char(&buffer, &left, '\t');
2212 err = proc_put_long(&buffer, &left, val, false);
2213 if (err)
2214 break;
2215 }
2216 }
2217
2218 if (!write && !first && left && !err)
2219 err = proc_put_char(&buffer, &left, '\n');
2220 if (write && !err)
2221 left -= proc_skip_spaces(&kbuf);
2222 free:
2223 if (write) {
2224 free_page(page);
2225 if (first)
2226 return err ? : -EINVAL;
2227 }
2228 *lenp -= left;
2229 *ppos += *lenp;
2230 return err;
2231 }
2232
2233 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2234 void __user *buffer,
2235 size_t *lenp, loff_t *ppos,
2236 unsigned long convmul,
2237 unsigned long convdiv)
2238 {
2239 return __do_proc_doulongvec_minmax(table->data, table, write,
2240 buffer, lenp, ppos, convmul, convdiv);
2241 }
2242
2243 /**
2244 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2245 * @table: the sysctl table
2246 * @write: %TRUE if this is a write to the sysctl file
2247 * @buffer: the user buffer
2248 * @lenp: the size of the user buffer
2249 * @ppos: file position
2250 *
2251 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2252 * values from/to the user buffer, treated as an ASCII string.
2253 *
2254 * This routine will ensure the values are within the range specified by
2255 * table->extra1 (min) and table->extra2 (max).
2256 *
2257 * Returns 0 on success.
2258 */
2259 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2260 void __user *buffer, size_t *lenp, loff_t *ppos)
2261 {
2262 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2263 }
2264
2265 /**
2266 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2267 * @table: the sysctl table
2268 * @write: %TRUE if this is a write to the sysctl file
2269 * @buffer: the user buffer
2270 * @lenp: the size of the user buffer
2271 * @ppos: file position
2272 *
2273 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2274 * values from/to the user buffer, treated as an ASCII string. The values
2275 * are treated as milliseconds, and converted to jiffies when they are stored.
2276 *
2277 * This routine will ensure the values are within the range specified by
2278 * table->extra1 (min) and table->extra2 (max).
2279 *
2280 * Returns 0 on success.
2281 */
2282 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2283 void __user *buffer,
2284 size_t *lenp, loff_t *ppos)
2285 {
2286 return do_proc_doulongvec_minmax(table, write, buffer,
2287 lenp, ppos, HZ, 1000l);
2288 }
2289
2290
2291 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2292 int *valp,
2293 int write, void *data)
2294 {
2295 if (write) {
2296 if (*lvalp > LONG_MAX / HZ)
2297 return 1;
2298 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2299 } else {
2300 int val = *valp;
2301 unsigned long lval;
2302 if (val < 0) {
2303 *negp = true;
2304 lval = (unsigned long)-val;
2305 } else {
2306 *negp = false;
2307 lval = (unsigned long)val;
2308 }
2309 *lvalp = lval / HZ;
2310 }
2311 return 0;
2312 }
2313
2314 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2315 int *valp,
2316 int write, void *data)
2317 {
2318 if (write) {
2319 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2320 return 1;
2321 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2322 } else {
2323 int val = *valp;
2324 unsigned long lval;
2325 if (val < 0) {
2326 *negp = true;
2327 lval = (unsigned long)-val;
2328 } else {
2329 *negp = false;
2330 lval = (unsigned long)val;
2331 }
2332 *lvalp = jiffies_to_clock_t(lval);
2333 }
2334 return 0;
2335 }
2336
2337 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2338 int *valp,
2339 int write, void *data)
2340 {
2341 if (write) {
2342 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2343 } else {
2344 int val = *valp;
2345 unsigned long lval;
2346 if (val < 0) {
2347 *negp = true;
2348 lval = (unsigned long)-val;
2349 } else {
2350 *negp = false;
2351 lval = (unsigned long)val;
2352 }
2353 *lvalp = jiffies_to_msecs(lval);
2354 }
2355 return 0;
2356 }
2357
2358 /**
2359 * proc_dointvec_jiffies - read a vector of integers as seconds
2360 * @table: the sysctl table
2361 * @write: %TRUE if this is a write to the sysctl file
2362 * @buffer: the user buffer
2363 * @lenp: the size of the user buffer
2364 * @ppos: file position
2365 *
2366 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2367 * values from/to the user buffer, treated as an ASCII string.
2368 * The values read are assumed to be in seconds, and are converted into
2369 * jiffies.
2370 *
2371 * Returns 0 on success.
2372 */
2373 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2374 void __user *buffer, size_t *lenp, loff_t *ppos)
2375 {
2376 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2377 do_proc_dointvec_jiffies_conv,NULL);
2378 }
2379
2380 /**
2381 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2382 * @table: the sysctl table
2383 * @write: %TRUE if this is a write to the sysctl file
2384 * @buffer: the user buffer
2385 * @lenp: the size of the user buffer
2386 * @ppos: pointer to the file position
2387 *
2388 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2389 * values from/to the user buffer, treated as an ASCII string.
2390 * The values read are assumed to be in 1/USER_HZ seconds, and
2391 * are converted into jiffies.
2392 *
2393 * Returns 0 on success.
2394 */
2395 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2396 void __user *buffer, size_t *lenp, loff_t *ppos)
2397 {
2398 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2399 do_proc_dointvec_userhz_jiffies_conv,NULL);
2400 }
2401
2402 /**
2403 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2404 * @table: the sysctl table
2405 * @write: %TRUE if this is a write to the sysctl file
2406 * @buffer: the user buffer
2407 * @lenp: the size of the user buffer
2408 * @ppos: file position
2409 * @ppos: the current position in the file
2410 *
2411 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2412 * values from/to the user buffer, treated as an ASCII string.
2413 * The values read are assumed to be in 1/1000 seconds, and
2414 * are converted into jiffies.
2415 *
2416 * Returns 0 on success.
2417 */
2418 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2419 void __user *buffer, size_t *lenp, loff_t *ppos)
2420 {
2421 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2422 do_proc_dointvec_ms_jiffies_conv, NULL);
2423 }
2424
2425 static int proc_do_cad_pid(struct ctl_table *table, int write,
2426 void __user *buffer, size_t *lenp, loff_t *ppos)
2427 {
2428 struct pid *new_pid;
2429 pid_t tmp;
2430 int r;
2431
2432 tmp = pid_vnr(cad_pid);
2433
2434 r = __do_proc_dointvec(&tmp, table, write, buffer,
2435 lenp, ppos, NULL, NULL);
2436 if (r || !write)
2437 return r;
2438
2439 new_pid = find_get_pid(tmp);
2440 if (!new_pid)
2441 return -ESRCH;
2442
2443 put_pid(xchg(&cad_pid, new_pid));
2444 return 0;
2445 }
2446
2447 /**
2448 * proc_do_large_bitmap - read/write from/to a large bitmap
2449 * @table: the sysctl table
2450 * @write: %TRUE if this is a write to the sysctl file
2451 * @buffer: the user buffer
2452 * @lenp: the size of the user buffer
2453 * @ppos: file position
2454 *
2455 * The bitmap is stored at table->data and the bitmap length (in bits)
2456 * in table->maxlen.
2457 *
2458 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2459 * large bitmaps may be represented in a compact manner. Writing into
2460 * the file will clear the bitmap then update it with the given input.
2461 *
2462 * Returns 0 on success.
2463 */
2464 int proc_do_large_bitmap(struct ctl_table *table, int write,
2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2466 {
2467 int err = 0;
2468 bool first = 1;
2469 size_t left = *lenp;
2470 unsigned long bitmap_len = table->maxlen;
2471 unsigned long *bitmap = (unsigned long *) table->data;
2472 unsigned long *tmp_bitmap = NULL;
2473 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2474
2475 if (!bitmap_len || !left || (*ppos && !write)) {
2476 *lenp = 0;
2477 return 0;
2478 }
2479
2480 if (write) {
2481 unsigned long page = 0;
2482 char *kbuf;
2483
2484 if (left > PAGE_SIZE - 1)
2485 left = PAGE_SIZE - 1;
2486
2487 page = __get_free_page(GFP_TEMPORARY);
2488 kbuf = (char *) page;
2489 if (!kbuf)
2490 return -ENOMEM;
2491 if (copy_from_user(kbuf, buffer, left)) {
2492 free_page(page);
2493 return -EFAULT;
2494 }
2495 kbuf[left] = 0;
2496
2497 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2498 GFP_KERNEL);
2499 if (!tmp_bitmap) {
2500 free_page(page);
2501 return -ENOMEM;
2502 }
2503 proc_skip_char(&kbuf, &left, '\n');
2504 while (!err && left) {
2505 unsigned long val_a, val_b;
2506 bool neg;
2507
2508 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2509 sizeof(tr_a), &c);
2510 if (err)
2511 break;
2512 if (val_a >= bitmap_len || neg) {
2513 err = -EINVAL;
2514 break;
2515 }
2516
2517 val_b = val_a;
2518 if (left) {
2519 kbuf++;
2520 left--;
2521 }
2522
2523 if (c == '-') {
2524 err = proc_get_long(&kbuf, &left, &val_b,
2525 &neg, tr_b, sizeof(tr_b),
2526 &c);
2527 if (err)
2528 break;
2529 if (val_b >= bitmap_len || neg ||
2530 val_a > val_b) {
2531 err = -EINVAL;
2532 break;
2533 }
2534 if (left) {
2535 kbuf++;
2536 left--;
2537 }
2538 }
2539
2540 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2541 first = 0;
2542 proc_skip_char(&kbuf, &left, '\n');
2543 }
2544 free_page(page);
2545 } else {
2546 unsigned long bit_a, bit_b = 0;
2547
2548 while (left) {
2549 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2550 if (bit_a >= bitmap_len)
2551 break;
2552 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2553 bit_a + 1) - 1;
2554
2555 if (!first) {
2556 err = proc_put_char(&buffer, &left, ',');
2557 if (err)
2558 break;
2559 }
2560 err = proc_put_long(&buffer, &left, bit_a, false);
2561 if (err)
2562 break;
2563 if (bit_a != bit_b) {
2564 err = proc_put_char(&buffer, &left, '-');
2565 if (err)
2566 break;
2567 err = proc_put_long(&buffer, &left, bit_b, false);
2568 if (err)
2569 break;
2570 }
2571
2572 first = 0; bit_b++;
2573 }
2574 if (!err)
2575 err = proc_put_char(&buffer, &left, '\n');
2576 }
2577
2578 if (!err) {
2579 if (write) {
2580 if (*ppos)
2581 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2582 else
2583 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2584 }
2585 kfree(tmp_bitmap);
2586 *lenp -= left;
2587 *ppos += *lenp;
2588 return 0;
2589 } else {
2590 kfree(tmp_bitmap);
2591 return err;
2592 }
2593 }
2594
2595 #else /* CONFIG_PROC_SYSCTL */
2596
2597 int proc_dostring(struct ctl_table *table, int write,
2598 void __user *buffer, size_t *lenp, loff_t *ppos)
2599 {
2600 return -ENOSYS;
2601 }
2602
2603 int proc_dointvec(struct ctl_table *table, int write,
2604 void __user *buffer, size_t *lenp, loff_t *ppos)
2605 {
2606 return -ENOSYS;
2607 }
2608
2609 int proc_dointvec_minmax(struct ctl_table *table, int write,
2610 void __user *buffer, size_t *lenp, loff_t *ppos)
2611 {
2612 return -ENOSYS;
2613 }
2614
2615 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2616 void __user *buffer, size_t *lenp, loff_t *ppos)
2617 {
2618 return -ENOSYS;
2619 }
2620
2621 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2622 void __user *buffer, size_t *lenp, loff_t *ppos)
2623 {
2624 return -ENOSYS;
2625 }
2626
2627 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2628 void __user *buffer, size_t *lenp, loff_t *ppos)
2629 {
2630 return -ENOSYS;
2631 }
2632
2633 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2634 void __user *buffer, size_t *lenp, loff_t *ppos)
2635 {
2636 return -ENOSYS;
2637 }
2638
2639 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2640 void __user *buffer,
2641 size_t *lenp, loff_t *ppos)
2642 {
2643 return -ENOSYS;
2644 }
2645
2646
2647 #endif /* CONFIG_PROC_SYSCTL */
2648
2649 /*
2650 * No sense putting this after each symbol definition, twice,
2651 * exception granted :-)
2652 */
2653 EXPORT_SYMBOL(proc_dointvec);
2654 EXPORT_SYMBOL(proc_dointvec_jiffies);
2655 EXPORT_SYMBOL(proc_dointvec_minmax);
2656 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2657 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2658 EXPORT_SYMBOL(proc_dostring);
2659 EXPORT_SYMBOL(proc_doulongvec_minmax);
2660 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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